[One]The present invention relates to a method and system for detecting a connection failure of a parallel-connected cell, and more particularly, to a parallel-connected cell capable of detecting the disconnection of a specific cell by an open parallel connection line of the cell or an operation of a protection element such as a CID. It relates to a method and system for detecting a connection failure.
background
[2]
Unlike primary batteries that cannot be recharged, rechargeable secondary batteries are used in various fields ranging from small high-tech electronic devices such as smart phones, notebook computers, and tablet PCs to electric bicycles, electric vehicles, and energy storage systems (ESS). It is widely used.
[3]
Since medium and large devices such as electric bicycles, electric vehicles, and energy storage systems (ESS) require high output and large capacity, when the secondary battery is applied to medium or large devices, a plurality of battery cells are connected in series/parallel to each other and are electrically connected to each other. pack will be used.
[4]
In general, a battery cell included in a battery pack includes a current interruption device (CID) that prevents current from flowing through the cell by interrupting when the internal pressure of the cell increases as a protection device for securing safety during charging. It is configured to safely prevent overcharging.
[5]
However, when the CID of a specific battery cell operates while the battery cells are connected in parallel, the connection of the corresponding faulty battery cell is disconnected. This causes an overcurrent to flow, causing an overload in the normal battery cells. In addition, even when disconnection of a specific battery cell among parallel-connected battery cells occurs due to the operation of the protection element such as the CID as described above, as well as the opening of the parallel connection line of the specific battery cell, overcurrent is supplied to the remaining normal battery cells. will flow
[6]
This phenomenon accelerates cell deterioration and results in reduction of battery performance and lifespan. In order to prevent such a problem, the parallel connection line of the cells is opened or the CID operation is performed in a state in which a plurality of battery cells are connected in parallel. A technology capable of detecting a cell disconnection state is required.
[7]
(Patent Document 1) KR10-2017-0064608 A1
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[8]
An object of the present invention is to solve the above-described problem, and to provide a method for detecting that a parallel connection line of a specific cell among parallel-connected battery cells is opened or disconnection due to a CID operation is detected.
means of solving the problem
[9]
In the method for detecting a connection failure of a parallel-connected cell according to an embodiment of the present invention, reference data when a cell connection failure occurs by generating a current interruption device (CID) operation or a parallel connection line open situation in a discharging battery a reference data acquisition step to acquire; a monitoring step of monitoring actual measurement driving discharge data for a battery being discharged by an operation of an external device; From the actual driving discharge data monitored in the monitoring step, it is compared whether there is a section that matches the amount of change in the discharge voltage value due to the CID operation or parallel connection line open in the reference data, and according to the comparison result, the corresponding battery a cell connection failure primary detection step of firstly detecting whether a cell connection failure has occurred due to CID operation or parallel connection line open; a final cell connection failure detection step of finally confirming whether a result of the first detection that the cell connection failure has occurred in the cell connection failure primary detection step is appropriate; is comprised of
[10]
On the other hand, when it is finally confirmed that the cell connection failure has occurred due to CID operation or parallel connection line open in the battery in the final detection step of the cell connection failure, an abnormality notification step of generating and notifying an abnormal signal indicating this; Consists of further including.
[11]
Specifically, in the reference data acquisition step, a predetermined reference battery connected to an external device is discharged through the operation of the external device, and a discharge voltage value is measured at a predetermined period interval to obtain the measured discharge voltage value. a driving discharge reference data acquisition step of acquiring driving discharge reference data based on the a connection failure time reference data acquisition step of acquiring connection failure time reference data that occurs by opening a CID operation or a parallel connection line at a predetermined time during the driving discharge reference data acquisition step; A primary method of obtaining data on the amount of change in the discharge voltage value in the CID operation or parallel connection line open area by summing the obtained driving discharge reference data and connection failure time reference data for the same time period connection failure detection reference data acquisition step; The driving discharge reference data acquisition step, the connection failure time reference data acquisition step, and the primary connection failure detection reference data acquisition step are repeated a predetermined number of times or more, and a machine learning technique for a plurality of primary connection failure detection reference data obtained through this a final connection failure detection reference data acquisition step of finally acquiring data on the amount of change in the discharge voltage value in the CID operation or the parallel connection line open region by applying ? It is characterized in that it comprises a.
[12]
Meanwhile, in the cell connection failure first detection step, from the actual driving discharge data monitored in the monitoring step, it is compared whether there is a section that matches the final connection failure detection reference data obtained in the final connection failure detection reference data acquisition step. the step of comparing whether they match; As a result of comparison, if there is a section from the measured driving discharge data that matches the final connection failure detection reference data, the section is determined as a section in which the amount of change in the discharge voltage value due to CID operation or parallel connection line opening occurs. , a connection failure primary determination step, characterized in that the first determination that a cell connection failure has occurred due to CID operation or parallel connection line open in the corresponding battery; It is characterized in that it comprises a.
[13]
On the other hand, the final detection of the cell connection failure is a charging current that forms a charging current in the battery that is primarily detected as a cell connection failure state due to a CID operation or a parallel connection line open in the cell connection failure primary detection step formation step; DCIR measuring step of measuring DCIR (Direct Current Internal Resistance) of the battery in a state in which a charging current flows through the battery by the charging current forming step; a DCIR comparison step of comparing whether the DCIR value of the battery measured in the DCIR measurement step is out of a predetermined DCIR reference range; As a result of comparison, when the DCIR value of the battery is out of a predetermined DCIR reference range, a connection that is finally determined as a state in which a cell connection failure has occurred due to a current interruption device (CID) operation or a parallel connection line open in the corresponding battery failure final judgment step; It is characterized in that it comprises a.
[14]
Here, the driving discharge reference data is an amount of change in a discharge voltage value for the reference battery, and the connection failure time reference data is a discharge voltage value generated by a CID operation or a parallel connection line opening with respect to the reference battery. It is characterized by the amount of change of .
[15]
Meanwhile, a system for detecting a connection failure of parallel-connected cells according to an embodiment of the present invention includes: one or more batteries including at least one or more cells connected in parallel; a voltage measuring unit that measures the discharge voltage of the battery at predetermined periodic intervals; a monitoring unit for monitoring actual measurement driving discharge data derived as an analog signal in a waveform form based on the discharge voltage value measured by the voltage measuring unit; a memory unit storing reference data for detecting whether a cell connection failure has occurred due to a current interruption device (CID) operation or a parallel connection line open in the battery; Using the reference data stored in the memory unit, it is determined whether there is a section in the actually measured driving discharge data monitored by the monitoring unit that matches the amount of change in the discharge voltage value due to the CID operation of the reference data or the parallel connection line open. a cell connection failure primary detection unit that detects and primarily detects whether a cell connection failure has occurred due to a CID operation or a parallel connection line open in the corresponding battery; The cell connection failure primary detection unit checks whether the result of the first detection of a cell connection failure state is appropriate, and finally determines whether a cell connection failure has occurred due to CID operation or parallel connection line open in the corresponding battery. Cell connection failure final detection unit to detect; is comprised of
[16]
Here, the reference data stored in the memory unit includes final connection failure detection reference data, and the final connection failure detection reference data is a battery discharge voltage value generated during CID operation or parallel connection line opening. It is characterized by the amount of change of .
[17]
Meanwhile, the cell connection failure primary detection unit may include: a matching unit comparing whether a section matching the final connection failure detection reference data exists among the actually measured driving discharge data of the battery monitored by the monitoring unit; As a result of comparison, if there is a section matching the final connection failure detection reference data in the measured driving discharge data, it is detected as a section in which the amount of change in the discharge voltage value due to CID operation or parallel connection line opening occurs, and the corresponding a connection failure primary determination unit that first determines that a cell connection failure has occurred due to CID operation or parallel connection line open in the battery; When the first connection failure determination unit determines that the battery has a cell connection failure due to CID operation or parallel connection line open, a cell that generates and outputs a cell connection failure primary detection signal indicating this Connection failure primary detection signal generator; It is characterized in that it comprises a.
[18]
Meanwhile, the cell connection failure final detection unit may include: a DCIR measurement unit configured to measure a direct current internal resistance (DCIR) of the battery in a state in which a charging current is supplied to the battery corresponding to the cell connection failure primary detection signal; a DCIR comparator for comparing whether the DCIR value measured by the DCIR measuring unit is out of a predetermined DCIR reference range; As a result of the comparison of the DCIR comparator, when the DCIR value of the battery corresponding to the cell connection failure primary detection signal is out of a predetermined DCIR reference range, the cell connection failure occurs due to CID operation or parallel connection line open in the corresponding battery. a connection failure final determination unit that finally determines that the state has occurred, and generates and outputs a cell connection failure final detection signal indicating this; It is characterized in that it comprises a.
[19]
On the other hand, when the cell connection failure final detection signal is output from the cell connection failure final determination unit, a notification unit for generating and outputting an abnormal signal; It is characterized in that it is configured to further include.
[20]
Here, the measured driving discharge data is characterized in that the amount of change in the discharge voltage value.
Effects of the Invention
[21]
The present invention primarily detects a cell connection failure state due to CID operation or parallel connection line open in real time with respect to a battery being discharged according to the operation of an external device (eg, a car), and DCIR measurement of the battery Through the process of final confirmation of the primary detection result, it is possible to double check. Accordingly, it is possible to detect a cell connection failure state due to a CID operation or an open parallel connection line with improved accuracy. Accordingly, by facilitating the countermeasure, it is possible to prevent battery degradation and performance degradation that may be caused by disconnection (failure) of a specific cell due to a CID operation or an open parallel connection line.
Brief description of the drawing
[22]
1 is a diagram illustrating an example of an analog signal in a waveform form according to a change in a discharge voltage value generated with respect to a battery being discharged according to the operation of a vehicle.
[23]
FIG. 2 is a view showing an example of converting the analog signal of the waveform shown in FIG. 1 into the form of a linear function.
[24]
3 is a diagram schematically illustrating a principle of acquiring reference data capable of detecting a CID operation or an open state of a parallel connection line from a waveform-type analog signal.
[25]
4 is a flowchart illustrating a method for detecting a connection failure of a parallel-connected cell according to the present invention.
[26]
5 is a block diagram schematically illustrating a system for detecting a connection failure of a parallel-connected cell according to the present invention.
Best mode for carrying out the invention
[27]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be implemented in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.
[28]
Hereinafter, the present invention will be described in detail with reference to the drawings.
[29]
1. Terms used in the present invention
[30]
go. Reference Battery/Actual Battery
[31]
The battery in the present invention has a structure in which at least one or more cells are connected in parallel, and may be mounted and used in any device using the battery, including, for example, a car, a scooter, an electric kickboard, an energy storage system (ESS), and the like. In this specification, a car battery mounted in a car to supply power to a power motor will be described as an example.
[32]
The reference battery used in the present invention refers to a battery used in an experimental process for acquiring reference data for detecting a CID operation or a parallel connection line open state, and the actual battery is a battery mounted in a vehicle in actual operation. means
[33]
These are merely terms separated in order to clearly explain the procedure of the present invention, and the structure and function are the same.
[34]
me. Data based on driving discharge/Data based on the point of connection failure
[35]
The driving discharge reference data is an amount of change in a discharge voltage value obtained with respect to a battery being discharged through a predetermined experiment, which means change values ​​in the discharge voltage value expressed as an analog signal in the form of a waveform as shown in FIG. 1 .
[36]
The connection failure time reference data is the amount of change in the discharge voltage value that occurs when the CID operation or parallel connection line is opened, which is obtained through a predetermined experiment. Among the values, it means the amount of change in the discharge voltage value in region A that occurs during CID operation or parallel connection line opening.
[37]
All. Actual driving discharge data
[38]
The actual driving discharge data is the amount of change in the discharge voltage value obtained with respect to the battery being discharged according to the actual driving of the vehicle, which means the change values ​​of the discharge voltage value expressed as an analog signal in the form of a waveform as shown in FIG. 1 .
[39]
To distinguish whether the above-described driving discharge reference data and the actual measured driving discharge data are the amount of change in the discharge voltage value obtained in a predetermined experimental process for preparing the reference data or the amount of change in the discharge voltage value obtained according to the actual operation of the vehicle It is a term used for These data are derived, for example, as analog signals in the form of dynamic waveforms as shown in FIG. 1 .
[40]
La. external device
[41]
The external device referred to in the present invention is a device equipped with an electric power motor, and means, for example, an automobile. However, the present invention is not limited thereto, and the external device may be any device using a battery, such as an energy storage system (ESS), a scooter, or an electric kickboard, as well as a vehicle.
[42]
2. A method for detecting a failure of a parallel-connected cell according to the present invention (refer to FIG. 4)
[43]
A method for detecting a failure of a parallel-connected cell according to the present invention is configured to include the following steps.
[44]
2.1. Reference data acquisition step (S100)
[45]
The reference data acquisition step is a step of acquiring reference data when a cell connection failure occurs by generating a CID operation or a parallel connection line open situation in the discharging battery, and may include the following detailed steps have.
[46]
go. Driving discharge reference data acquisition step (S110)
[47]
This is a step of obtaining driving discharge reference data of the reference battery, ie, a change amount of a discharge voltage value, generated according to the operation while arbitrarily operating the external device in a state in which a predetermined reference battery is mounted on the external device.
[48]
As described above, the battery in the present invention is, for example, a car battery mounted in a car to supply power to a power motor, and the external device may mean a car equipped with a power motor. In the case of a car battery, discharging is the state of supplying power to the car's electric motor. This is because the degree of power supplied from the battery to the electric motor dynamically changes according to the style of stepping on the accelerator of the car, so the discharge voltage value As shown in FIG. 1 , it is derived as a decreasing waveform with various variation widths.
[49]
In other words, the driving discharge reference data acquisition step is to acquire the amount of change in the discharge voltage value derived from the analog signal in the waveform form as shown in FIG. 1 , and for this purpose, a reference battery composed of parallel-connected cells is mounted on an external device By discharging in one state and measuring the discharge voltage at predetermined periodic intervals, driving discharge reference data as an amount of change according to time may be obtained based on the measured discharge voltage values.
[50]
me. Data acquisition step at the time of connection failure (S120)
[51]
In the connection failure time reference data acquisition step, during the driving discharge reference data acquisition step S110, a current interruption device (CID) operation or a parallel connection line open condition occurs in any one cell to cause a cell connection failure This is a step of acquiring the amount of change in the discharge voltage value that occurs in the case of the state.
[52]
As described above, when the battery is discharged by the operation of an external device (eg, a car), the change in the discharge voltage value of the battery is shown in FIG. It can be derived as an analog signal in the form of a waveform as shown. For this analog signal, if the intermediate value or average value of the corresponding discharge voltage value is selected for each detailed section, the analog signal in the waveform form of FIG. 1 is shown in FIG. It can be transformed into a decreasing linear function form as shown in Fig. In this state, when the CID of any one cell operates or a specific parallel connection line is opened and the cell connection failure state occurs, a region in which the amount of change in the discharge voltage value decreases occurs, and the region is located in region A of FIG. As you can see, it appears in the form of a step. Here, it is sufficient to describe the detailed interval as a time interval sufficient to detect the CID operation or the open state of the parallel connection line.
[53]
Since the discharge voltage values ​​are dynamically changed in the analog signal having a waveform as shown in FIG. 1, even if there is a region corresponding to the amount of change, such as region A in FIG. Although it is very difficult to detect whether it is, region A can be easily distinguished in the form of a linear function as shown in FIG. 2 .
[54]
Utilizing this point, the connection failure time reference data acquisition step is to acquire the amount of change in the discharge voltage value that occurs according to the connection failure due to the CID operation corresponding to the area A of FIG. 2 or the parallel connection line open, For example, with respect to a discharging reference battery, the CID of any one cell is artificially operated at a predetermined time point or a specific parallel connection line is opened to cause a cell connection failure state, and the amount of change in the discharge voltage value that occurs accordingly can be obtained. The connection failure time obtained in this way, that is, the amount of change in the discharge voltage value corresponding to the area A of FIG. 2 may be referred to as connection failure time reference data.
[55]
All. Primary connection failure detection standard data acquisition step (S130)
[56]
In the first connection failure detection reference data acquisition step, the driving discharge reference data obtained in the driving discharge reference data acquisition step (S110) and the connection failure time reference data acquired in the reference connection failure time reference data acquisition step (S120) are obtained. In the amount of change in the discharge voltage value generated according to the actual vehicle operation derived from the analog signal in the waveform form shown in FIG. 1 by summing over the same time period, the discharge voltage value generated according to the CID operation or parallel connection line open Data for detecting whether a change has occurred may be obtained primarily.
[57]
In other words, by adding the data for region A shown in FIG. 2 to the analog signal in the waveform of FIG. 1 for the same time period, the amount of change in the discharge voltage value corresponding to region B shown in FIG. to be obtained with
[58]
As described above, the data obtained primarily for the B region can be described as reference data at the time of the primary connection failure.
[59]
La. Final connection failure detection standard data acquisition step (S140)
[60]
In the final connection failure detection reference data acquisition step, the driving discharge data reference acquisition step (S110), the connection failure time reference data acquisition step (S120) and the primary connection failure detection reference data acquisition step (S130) are repeated multiple times to obtain the A plurality of primary connection failure time reference data that is a change amount of a discharge voltage value corresponding to the region B of FIG. 3 is acquired, and a machine learning technique is applied to the obtained plurality of primary connection failure time reference data, as shown in FIG. Data (final connection failure reference data) on the amount of change in the discharge voltage value corresponding to the region B of .
[61]
Meanwhile, since the discharge voltage value of the battery generated according to the actual operation of the vehicle has a different driving style for each user (driver), the range of the amount of change in the discharge voltage value generated accordingly will be very diverse. Accordingly, even if the change in the discharge voltage value according to various driving styles is derived from various examples, from S110 to While repeating S130, a number of data according to various cases are acquired, and the final connection failure detection data is obtained by applying a machine learning technique to learn the amount of change in area B of FIG. By acquiring it, it is possible to detect, in real time, a battery in which a cell connection failure due to a CID operation or a parallel connection line open among batteries mounted thereon during actual vehicle operation has occurred.
[62]
The final connection failure detection reference data obtained as described above is stored in the memory unit 400 to be described later and used as reference data to enable real-time detection of connection failure caused by CID operation or parallel connection line open. do.
[63]
2.2. Monitoring step (S200)
[64]
In the monitoring step, for a battery mounted on an external device (eg, a car) and being discharged according to the operation of the external device, at a predetermined period interval, a discharge voltage value according to the operation of the external device is measured, and the measured It is a step of monitoring the amount of change based on the discharge voltage value.
[65]
That is, the amount of change in the discharge voltage value derived from the analog signal in the waveform form as shown in FIG. 1 is monitored, and the amount of change in the discharge voltage value is referred to as actual measurement driving discharge data.
[66]
Such a step is performed by the monitoring unit 300 to be described later.
[67]
2.3. Cell connection failure first detection step (S300)
[68]
In the cell connection failure primary detection step, the CID operation or parallel obtained in the final connection failure reference data acquisition step ( S140 ) from the actual driving discharge data derived as an analog signal in the form of a waveform monitored in the monitoring step ( S200 ) It detects in real time whether the amount of change in the discharge voltage value (final connection failure detection data) corresponding to the cell connection failure state due to the opening of the connection line has occurred, and the cell connection failure state due to the CID operation or the opening of the parallel connection line is 1 As a step of secondary detection, it may be configured to include the following detailed steps. (Cell connection failure primary detection unit, 500)
[69]
go. Matching comparison step (S310)
[70]
In the matching step, the final connection failure detection reference data obtained in the final connection failure detection reference data acquisition step (S140) of the reference data acquisition step (S100) from the actual driving discharge data monitored in the monitoring step (S200) It is a step of comparing whether there is an interval matching with .
[71]
That is, the measured battery being discharged according to the operation of an external device (eg, automobile) is derived as an analog signal in the form of a waveform as shown in FIG. 1 in which the discharge voltage value changes. It is to compare whether there exists a section consistent with the change amount of the discharge voltage value in the region B of FIG. 3 corresponding to the final connection failure detection reference data. Such a step is performed by the matching unit 510 to be described later.
[72]
me. Connection failure first determination step (S320)
[73]
As a result of the comparison, if there is a section matching the final connection failure detection reference data from the actually measured driving discharge data generated for the actually measured battery that is currently being discharged, the section is defined as the CID operation of at least one cell of the actually measured battery or It is determined as a section in which the amount of change in the discharge voltage value is reduced due to the occurrence of the parallel connection line open, and a cell connection failure primary detection signal for the measured battery may be generated and output.
[74]
That is, in a state in which the discharge voltage value dynamically changes in the form of a waveform as shown in FIG. 1 , when a section matching the amount of change in the discharge voltage value corresponding to the region B of FIG. 3 is detected, the corresponding section is set to at least one of the measured batteries. It is judged as a section in which the amount of change in the discharge voltage value is reduced when the CID of any one cell operates or a specific parallel connection line is opened, and generates and outputs a cell connection failure primary detection signal for the actual measured battery indicating this. . Such a step is performed by the connection failure primary determination unit 520 and the cell connection failure primary detection signal generation unit 530 to be described later.
[75]

[76]
Here, the cell connection failure primary detection signal may include a bank identification number for identifying a battery bank to which the measured battery belongs. In this case, the battery bank refers to a cell bundle composed of a plurality of actually measured batteries, and is actually measured in which CID operation or parallel connection line open occurs using the bank identification number included in the cell connection failure primary detection signal. A battery bank including batteries may be detected.
[77]

[78]
As another embodiment, the cell connection failure primary detection signal may include a battery identification number to identify the actually measured battery.
[79]
On the other hand, if there is no section matching the final connection failure detection reference data in the measured driving discharge data, the battery is connected to a normal cell in which a cell connection failure state due to CID operation or parallel connection line opening does not occur. It can be determined that the state is (S330).
[80]
2.4. Cell connection failure final detection step (S400)
[81]
The cell connection failure final detection step includes the first detection of a battery that is primarily detected as a cell connection failure state due to a CID operation or a parallel connection line open in the cell connection failure primary detection step (S300). This is a step of finally detecting whether the battery is in a cell connection failure state due to CID operation or parallel connection line open by checking whether the result is correct, and may include the following detailed steps. (Cell connection failure final detection unit, 600)
[82]
go. Charging current forming step (S410)
[83]
In the cell connection failure primary detection step (S300), a charging current is formed in the actually measured battery that is primarily detected as a cell connection failure state due to CID operation or parallel connection line open, which is, for example, an external charger. Alternatively, the charging current may flow to the battery through the connection of the vehicle's power generation circuit (not shown) to form a charging current in the actually measured battery, which is primarily detected as a cell connection failure state.
[84]
me. DCIR measurement step (S420)
[85]
The DCIR measurement step is a step of measuring the DCIR value of the battery bank including the actually measured battery in which the CID operation or the parallel connection line open occurs while the charging current flows in the battery through the charging current forming step (S410). .
[86]
The DCIR (Direct Current Internal Resistance) is a battery internal resistance value, which can be measured only in an initial state in which a charging current flows through an external charger or connection of a power generation circuit (not shown) of a vehicle. Therefore, in the initial state in which the charging current is formed in the battery bank (Example 1) or the measured battery (Example 2) that is primarily detected as a cell connection failure state through the charging current forming step (S410), the DCIR It may be configured to measure the DCIR value by performing the measurement step. The DCIR value measured as described above is used for final determination by reconfirming whether the result of the first detection as the cell connection failure state is correct.
[87]
This step is performed by the DCIR measurement unit 610 of the cell connection failure final detection unit 600 to be described later.
[88]
All. DCIR comparison step (S430)
[89]
In the DCIR comparison step, it is possible to compare whether the DCIR value of the actually measured battery that is primarily detected as being in the cell connection failure state measured through the DCIR measuring step S420 is outside a predetermined DCIR reference range.
[90]

[91]
Here, since the cell connection failure primary detection signal includes the bank identification number of the battery bank including the battery (cell) in which the connection failure state due to CID operation or parallel connection line open is generated, the cell connection failure signal is used. It is possible to identify a battery bank that is primarily detected as a connection failure state, identify a DCIR value measured for the battery bank, and compare whether the DCIR value is outside a predetermined DCIR reference range.
[92]
Here, since the cell connection failure primary detection signal includes the battery identification number of the actually measured battery, the battery first detected as a cell connection failure state is determined using this It is possible to identify, identify a DCIR value measured for the battery, and compare whether the DCIR value is outside a predetermined DCIR reference range.
[93]
Such a step is performed by the DCIR comparison unit 620 of the cell connection failure final detection unit 600 to be described later.
[94]
La. Connection failure final determination step (S440)
[95]
As a result of the comparison, when the DCIR value of the battery bank (Example 1) or the measured battery is out of a predetermined DCIR reference range, the result of the first detection of a cell connection failure state with respect to the corresponding battery bank or the measured battery is correct. It is determined that the cell connection failure state is finally determined, and a cell connection failure state final detection signal indicating this may be output.
[96]

[97]
Here, the cell connection failure final detection signal may include a bank identification number capable of identifying the corresponding battery bank including the actually measured battery in which the CID operation or the parallel connection line open has occurred.
[98]

[99]
As another example, the cell connection failure final detection signal may include a battery identification number of the actually measured battery.
[100]
This is done by the connection failure final determination unit 640 of the cell connection failure final detection unit 600, which will be described later.
[101]
On the other hand, if the DCIR value of the measured battery corresponding to the cell connection failure primary detection signal is within a predetermined reference range, it is determined that the cell connection failure has occurred in the measured battery due to CID operation or parallel connection line open. It is not confirmed, but it may be configured to recognize a cell connection failure suspicious state (S450) and monitor the battery state with more careful attention.
[102]
2.5. Abnormality notification step (S500)
[103]
In the abnormal notification step, when the cell connection failure final detection signal is output through the cell connection failure final detection step (S400), a cell connection failure due to CID operation or parallel connection line open in the actual battery has occurred. An abnormal signal can be generated and notified. This is performed by the anomaly notification unit 700 .
[104]
Accordingly, the user can recognize that there is an abnormality in the connection state of the battery in real time and take action against it.
[105]
Here, the abnormal signal may include a battery bank including a battery in which a cell connection failure has occurred due to a CID operation or a parallel connection line open or an identification number of the corresponding battery.
[106]
2.6. Cell connection failure final detection data feedback step (S600)
[107]
The data (the amount of change in the discharge voltage value) of the cell connection failure state acquired and determined in the cell connection failure final detection step is fed back to the final connection failure detection reference data acquisition step (S140) of the reference data acquisition step (S100) The reference data by machine learning can be enriched and enriched.
[108]
If the previous reference data acquisition step (S100) was a process of acquiring reference data by artificially creating a cell connection failure state, the data in the case of a cell connection failure state in an actual situation is fed back to the reference data through this feedback step to provide a standard Data can be obtained more precisely.
[109]
Conventionally, an analog signal generated during discharging of a car battery is in the form of a complex waveform including both the dynamically changing discharge voltage values ​​and the discharging voltage values ​​that change when the CID operation or parallel connection line is opened. Since it is difficult to detect a region corresponding to the amount of change in the discharge voltage value due to the open parallel connection line, it is difficult to detect a cell connection failure (disconnection) state, thereby accelerating cell degradation. In contrast, the present invention obtains reference data for the amount of change in the discharge voltage that occurs during CID operation or parallel connection line opening through the above-described experiment, and uses this to obtain an analog signal in a complex waveform form generated during discharge. It is possible to detect a region corresponding to the amount of change in the discharge voltage value due to the CID operation or the opening of the parallel connection line. Accordingly, it is possible to detect a cell connection failure state occurring with respect to the battery being discharged in real time. Accordingly, by facilitating the countermeasure, it is possible to prevent battery degradation and performance degradation that may be caused by disconnection (failure) of a specific cell due to a CID operation or an open parallel connection line.
[110]
3. Connection failure detection system of parallel-connected cells according to the present invention (see Fig. 5)
[111]
3.1. Battery(100)
[112]
The system for detecting a connection failure of parallel-connected cells according to the present invention may include one or more batteries including one or more battery cells 110 , and the battery cells are connected in parallel to establish an electrical connection between the battery cells.
[113]
The battery may be a battery mounted and used in devices such as a vehicle, an energy storage system (ESS), a scooter, and an electric kickboard, and in this specification, a vehicle battery mounted in a vehicle to supply power to an electric motor will be described as an example do.
[114]
3.2. Voltage measuring unit (200)
[115]
The voltage measuring unit is configured to measure the discharge voltage value of the battery at a predetermined cycle interval, and based on the discharge voltage value measured by the voltage measuring unit, actual measurement driving discharge data that is a change in the discharge voltage value of the battery is obtained. can
[116]
3.3. monitoring unit 300
[117]
The monitoring unit monitors the amount of change in the discharge voltage value of the battery derived from an analog signal in the form of a waveform as shown in FIG. 1 based on the discharge voltage value measured at a predetermined interval by the voltage measurement unit 200 . is a configuration that
[118]
In the case of a car battery, since the degree of supplying power to the electric power motor varies according to the style of stepping on the accelerator, the amount of change in the discharge voltage value of the battery can be derived as an analog signal in the form of a waveform in FIG. The amount of change in the voltage value (actually measured driving discharge data) is monitored in real time.
[119]
3.4. memory unit 400
[120]
It is a configuration in which reference data is stored so as to detect a cell connection failure state due to a CID operation obtained through a predetermined experiment or a parallel connection line open.
[121]
The reference data includes final connection failure detection reference data as the amount of change in the discharge voltage value generated by the CID operation or parallel connection line open, and in other words, means the amount of change.
[122]
The process of acquiring the final connection failure detection reference data stored in the memory unit will be described. First, in a state in which a predetermined battery is mounted in an external device (eg, a vehicle), artificially operating the external device while operating the external device according to the operation The amount of change (driving discharge reference data) of the generated battery discharge voltage value is acquired. The battery in the present invention is, for example, a car battery mounted in a car to supply electric power to an electric power motor. In the case of a car battery, discharging is the state of supplying power to the electric vehicle's electric motor, and this is because the degree of power supplied from the battery to the electric motor dynamically changes according to the style of stepping on the car's accelerator, so the discharge voltage value As shown in FIG. 1 , it is derived as a decreasing waveform with various widths of change.
[123]
During the process of acquiring the driving discharge data derived in this form, a CID operation or a specific parallel connection line open condition is generated in any one cell, and the discharge voltage value generated in the case of a cell connection failure state The amount of change (data based on the time of connection failure) is acquired. The reason for performing this process is that, as described above, when the battery is discharged according to the operation of the electric vehicle, the degree of supplying power to the power motor varies according to the style of stepping on the accelerator, so the change in the discharge voltage value of the battery is It is derived as an analog signal in the form of a waveform as shown in FIG. 1 . For these analog signals, when the intermediate value or average value of the corresponding discharge voltage value is selected for each detailed section, the analog signal in the waveform form of FIG. 1 is converted into a decreasing linear function form as shown in FIG. could check In addition, in that state, when the CID of any one cell operates or a specific parallel connection line is opened and the cell connection failure state occurs, a region in which the amount of change in the discharge voltage value decreases occurs, and the corresponding region is region A of FIG. 2 . As shown in the figure, it was confirmed that it appeared in the form of a step. Since the discharge voltage values ​​are dynamically changing in the analog signal in the waveform form as shown in FIG. 1, even if the same amount of change as in area A of FIG. 2 occurs, it is difficult to detect whether the change is due to the CID operation or the parallel connection line open. Although it is very difficult, it is easy to distinguish region A in the form of a linear function as shown in FIG. 2 .
[124]
Using this point, for example, the CID of any one cell is operated or a specific parallel connection line is opened at a predetermined time with respect to the battery being discharged in order to obtain the amount of change in the discharge voltage value for the region A of FIG. 2 . (Open) to artificially make the cell connection failure state, and to acquire the amount of change in the discharge voltage value (data based on the connection failure time) that occurs accordingly.
[125]
When the actual measured driving discharge data and the connection failure time reference data are obtained through the above-described process, they are summed for the same time period, and from the amount of change in the discharge voltage value derived from the analog signal in the waveform shown in FIG. 1 , the CID operation or Reference data capable of detecting whether there is an amount of change in a discharge voltage value generated according to an open parallel connection line may be primarily obtained. In other words, the amount of change in the discharge voltage value in the region A shown in FIG. 2 is added to the analog signal in the waveform of FIG. 1 for the same time period, and the amount of change in the discharge voltage value corresponding to the region B shown in FIG. to be obtained first.
[126]
By repeating this process a number of times, a plurality of data on the amount of change corresponding to region B of FIG. 3 is acquired, and machine learning techniques are applied to these data to determine the discharge voltage value by CID operation or parallel connection line open. By learning about the amount of change, it is possible to obtain the final connection failure detection reference data that can detect the amount of change with respect to the CID operation or parallel connection line open time from the analog signal.
[127]
Meanwhile, the memory unit may also store DCIR reference range data used as reference data for finally determining whether a result of the first detection of a cell connection failure state with respect to the battery is correct.
[128]
In addition, the final detection data of the battery finally detected that the cell connection failure has occurred due to the CID operation or the parallel connection line opening is received from the cell connection failure final detection unit 600 to be described later, reflected in the reference data, and stored can As described above, since the reference data pre-stored in the memory unit is data obtained by artificially generating a cell connection failure state, data (final detection data) in the case of a cell connection failure state in an actual situation is converted into the cell connection failure state. By receiving feedback from the detector 600 and reflecting the feedback on the reference data, it is possible to more precisely secure the reference data.
[129]
3.5. Cell connection failure primary detection unit (500)
[130]
The cell connection failure primary detection unit, the cell connection failure detection unit, from the actual driving discharge data monitored by the monitoring unit 300, a section that matches the amount of change in the discharge voltage value due to CID operation or parallel connection line opening occurs As a configuration for first detecting a cell connection failure state due to CID operation of the corresponding battery or opening of a parallel connection line by detecting whether or not the battery has been activated, the configuration may include the following detailed configuration.
[131]
go. Match or not compare unit (510)
[132]
The coincidence comparison unit may compare whether there is a section matching the last connection failure detection reference data stored in the memory unit 400 among the actually measured driving discharge data of the battery monitored by the monitoring unit 300 .
[133]
In other words, in the amount of change (actually measured driving discharge data) of the discharge voltage of the battery currently being discharged, which is derived as an analog signal in the form of a waveform as shown in FIG. 1, the amount of change (finally It is to compare whether there is a section that matches the connection failure detection standard data).
[134]
me. Connection failure primary determination unit (520)
[135]
As a result of the comparison, if there is a section that matches the final connection failure reference data in the measured driving discharge data, the section is defined as a region in which the amount of change in the discharge voltage value is reduced by CID operation or opening a specific parallel line in the battery. By detecting the battery, it may be first determined that a cell connection failure has occurred due to a CID operation or an open parallel connection line in the corresponding battery.
[136]
All. Cell connection failure primary detection signal generation unit (530)
[137]
When the first connection failure determination unit 520 determines that a cell connection failure has occurred due to a CID operation or a specific parallel connection line open in the battery, a cell connection failure primary detection signal indicating this is generated and output can
[138]
In this case, the cell connection failure primary detection signal includes data on the amount of change in the discharge voltage value corresponding to the section in which the cell connection failure due to the CID operation or the parallel connection line open has occurred.
[139]
In addition, the cell connection failure primary detection signal is a bank identification number or a corresponding battery identification number that can identify a battery bank to which a battery (cell) in which a cell connection failure has occurred due to CID operation or parallel connection line open is included. may include Here, the battery bank refers to a cell bundle composed of a plurality of batteries, and when a bank identification number is included in the cell connection failure primary detection signal, a connection failure state due to CID operation or parallel connection line open occurs. A battery bank including a battery (cell) may be detected, and in the case of including a battery identification number, the battery itself in which a CID operation or a parallel connection line open has occurred may be detected.
[140]
3.6. Cell connection failure final detection unit (600)
[141]
The cell connection failure final detection unit is configured to recheck and finally detect the result of the cell connection failure caused by the CID operation or the parallel connection line open by the cell connection failure primary detection unit 500, It may be configured to include the following detailed configuration.
[142]
go. DCIR measuring unit (610)
[143]
A charging current flows to the battery through the connection of an external charger or the vehicle's power generation circuit (not shown), and in the initial state where the charging current flows to the battery, which is first detected as having a cell connection failure It can measure the direct current internal resistance (DCIR) of a battery bank.
[144]
The DCIR (Direct Current Internal Resistance) is an internal resistance value of the battery, which can be measured only in the initial state in which the charging current flows to the battery. It can be configured to measure the DCIR value in the initial state that forms the charging current in the .
[145]
The DCIR value measured as described above is used for final determination by reconfirming whether the result of the first detection of the cell connection failure state is correct.
[146]
me. DCIR comparison unit (620)
[147]
The DCIR comparator may compare whether the DCIR value of the battery or the battery bank that is primarily detected as the cell connection failure state measured by the DCIR measuring unit 610 is out of a predetermined DCIR reference range.
[148]

[149]
Here, when the cell connection failure primary detection signal includes the bank identification number of the battery bank to which the battery (cell) in which the connection failure state due to CID operation or parallel connection line open belongs, the cell connection failure is used It is possible to identify a battery bank that is primarily detected as a state, identify a DCIR value measured for the battery bank, and compare whether the DCIR value is outside a predetermined DCIR reference range.
[150]

[151]
In another embodiment, when the cell connection failure primary detection signal includes the identification number of the battery in which the connection failure state due to CID operation or parallel connection line open occurs, the cell connection failure state is first detected using this A battery may be identified, a DCIR value measured for the battery may be identified, and whether the DCIR value is outside a predetermined DCIR reference range may be compared.
[152]
All. Connection failure final determination unit (630)
[153]
As a result of the comparison, when the DCIR value of the battery is out of the predetermined DCIR reference range, it is determined that the result of the first detection of the cell connection failure state for the battery is correct, and finally it is determined that the cell connection failure state is correct, A cell connection failure state final detection signal indicating this may be output. Here, the cell connection failure final detection signal may include a battery identification number of the measured battery or a bank identification number of a battery bank to which the measured battery belongs.
[154]
On the other hand, if it is finally determined that the cell connection failure state, the final detected data including data on the amount of change in the discharge voltage value due to the CID operation or the parallel connection line open in the actually measured discharge data of the corresponding battery is stored in the memory unit ( 400), the reference data previously stored in the memory unit 400 reflects the data in the case of a cell connection failure in an actual situation, so that the reference data can be secured more precisely. .
[155]
3.7. Notification unit (700)
[156]
When the cell connection failure final detection signal is output from the connection failure final determination unit 630, the notification unit generates and outputs an abnormal signal including the battery identification number of the corresponding battery or the bank identification number of the battery bank to which the battery belongs. , so that the user can recognize that a cell connection failure state has occurred due to CID operation or a specific parallel line open in the battery.
[157]
On the other hand, the voltage measuring unit 200 , the monitoring unit 300 , the memory unit 400 , the cell connection failure primary detection unit 500 and the cell connection failure final detection unit 600 are the above-described cell connection failure detection units of the present invention. As a control device or control unit for implementing the detection process, it may be configured to be integrated into one integrated microprocessor or an engine control ECU (Electronic Control Unit) of a vehicle, and may be configured to be integrated into a battery management device of a vehicle battery pack.
[158]
On the other hand, although the technical idea of ​​the present invention has been described in detail according to the above embodiments, it should be noted that the above embodiments are for description and not for limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical spirit of the present invention.

WE CLAIMS

a reference data acquisition step of acquiring reference data in case a cell connection failure occurs by generating a current interruption device (CID) operation or a parallel connection line open situation in the discharging battery; a monitoring step of monitoring actually measured driving discharge data generated with respect to a battery being discharged by an operation of an external device; From the actual driving discharge data monitored in the monitoring step, it is compared whether there is a section that matches the amount of change in the discharge voltage value due to the CID operation or parallel connection line open in the reference data, and according to the comparison result, the corresponding battery a cell connection failure primary detection step of primarily detecting whether a cell connection failure has occurred due to CID operation or parallel connection line open; a final cell connection failure detection step of finally confirming whether a result of the first detection that the cell connection failure has occurred in the cell connection failure primary detection step is appropriate; A connection failure detection method of a parallel-connected cell comprising a.
[Claim 2]
According to claim 1, wherein when it is finally confirmed that a cell connection failure has occurred due to CID operation or parallel connection line open in the battery in the final detecting step of the cell connection failure, an abnormality notification step of generating and notifying an abnormal signal indicating this ; Connection failure detection method of a parallel-connected cell further comprising a.
[Claim 3]
The method of claim 1 , wherein the obtaining of the reference data comprises measuring a discharge voltage value at a predetermined period interval while discharging a predetermined reference battery connected to an external device through the operation of the external device, and thereby measuring the measured discharge. a driving discharge reference data acquisition step of acquiring driving discharge reference data based on a voltage value; a connection failure time reference data acquisition step of acquiring connection failure time reference data that occurs by opening a CID operation or a parallel connection line at a predetermined time during the driving discharge reference data acquisition step; A primary method of obtaining data on the amount of change in the discharge voltage value in the CID operation or parallel connection line open area by summing the obtained driving discharge reference data and connection failure time reference data for the same time period connection failure detection reference data acquisition step; The driving discharge reference data acquisition step, the connection failure time reference data acquisition step, and the primary connection failure detection reference data acquisition step are repeated a predetermined number of times or more, and a machine learning technique for a plurality of primary connection failure detection reference data obtained through this a final connection failure detection reference data acquisition step of finally acquiring data on the amount of change in the discharge voltage value in the CID operation or the parallel connection line open region by applying ? Connection failure detection method of parallel-connected cells, characterized in that comprising a.
[Claim 4]
The method according to claim 3, wherein in the cell connection failure primary detection step, in the actual driving discharge data monitored in the monitoring step, a section matching the final connection failure detection reference data obtained in the final connection failure detection reference data acquisition step is a matching step of comparing whether or not they exist; As a result of comparison, if there is a section from the measured driving discharge data that matches the final connection failure detection reference data, the section is determined as a section in which the amount of change in the discharge voltage value due to CID operation or parallel connection line opening occurs. , a connection failure primary determination step, characterized in that the first determination that a cell connection failure has occurred due to CID operation or parallel connection line open in the corresponding battery; Connection failure detection method of parallel-connected cells, characterized in that comprising a.
[Claim 5]
5. The method of claim 4, wherein the final detection step of the cell connection failure is a cell connection failure state due to the CID operation or the parallel connection line open in the first detection step of the cell connection failure. forming a charging current forming step; DCIR measuring step of measuring DCIR (Direct Current Internal Resistance) of the battery in a state in which a charging current flows through the battery by the charging current forming step; a DCIR comparison step of comparing whether the DCIR value of the battery measured in the DCIR measurement step is out of a predetermined DCIR reference range; As a result of comparison, when the DCIR value of the battery is out of a predetermined DCIR reference range, a connection that is finally determined as a state in which a cell connection failure has occurred due to a current interruption device (CID) operation or a parallel connection line open in the corresponding battery failure final judgment step; A connection failure detection method of a parallel-connected cell comprising a.
[Claim 6]
The method of claim 3 , wherein the driving discharge reference data is an amount of change in a discharge voltage value for the reference battery, and the connection failure time reference data is generated by a CID operation or a parallel connection line opening with respect to the reference battery. Connection failure detection method of parallel-connected cells, characterized in that the amount of change in the discharge voltage value.
[Claim 7]
one or more batteries comprising at least one or more cells connected in parallel; a voltage measuring unit that measures the discharge voltage of the battery at predetermined periodic intervals; a monitoring unit for monitoring actual measurement driving discharge data derived as an analog signal in a waveform form based on the discharge voltage value measured by the voltage measuring unit; a memory unit storing reference data for detecting whether a cell connection failure has occurred due to a current interruption device (CID) operation or a parallel connection line open in the battery; Using the reference data stored in the memory unit, it is determined whether there is a section in the actually measured driving discharge data monitored by the monitoring unit that matches the amount of change in the discharge voltage value due to the CID operation of the reference data or the parallel connection line open. a cell connection failure primary detection unit that detects and primarily detects whether a cell connection failure has occurred due to a CID operation or a parallel connection line open in the corresponding battery; The cell connection failure primary detection unit checks whether the result of the first detection of a cell connection failure state is appropriate, and finally determines whether a cell connection failure has occurred due to CID operation or parallel connection line open in the corresponding battery. Cell connection failure final detection unit to detect; A connection failure detection system of a parallel-connected cell comprising a.
[Claim 8]
The battery of claim 7 , wherein the reference data stored in the memory unit includes final connection failure detection reference data, and the final connection failure detection reference data is generated during a CID operation or a parallel connection line open. Connection failure system of parallel-connected cells, characterized in that the amount of change in the discharge voltage value of
[Claim 9]
The apparatus of claim 8 , wherein the cell connection failure primary detection unit comprises: a matching unit comparing whether a section matching the final connection failure detection reference data exists among the actually measured driving discharge data of the battery monitored by the monitoring unit; As a result of comparison, if there is a section matching the final connection failure detection reference data in the measured driving discharge data, it is detected as a section in which the amount of change in the discharge voltage value due to CID operation or parallel connection line opening occurs, and the corresponding a connection failure primary determination unit that first determines that a cell connection failure has occurred due to CID operation or parallel connection line open in the battery; When the first connection failure determination unit determines that the battery has a cell connection failure due to CID operation or parallel connection line open, a cell that generates and outputs a cell connection failure primary detection signal indicating this Connection failure primary detection signal generator; Connection failure detection system of parallel-connected cells, characterized in that comprising a.
[Claim 10]
The DCIR measurement of claim 9, wherein the cell connection failure final detection unit measures DCIR (Direct Current Internal Resistance) of the battery in a state in which a charging current flows to the battery corresponding to the cell connection failure primary detection signal. wealth; a DCIR comparator for comparing whether the DCIR value measured by the DCIR measuring unit is out of a predetermined DCIR reference range; As a result of the comparison of the DCIR comparator, when the DCIR value of the battery corresponding to the cell connection failure primary detection signal is out of a predetermined DCIR reference range, the cell connection failure occurs due to CID operation or parallel connection line open in the corresponding battery. a connection failure final determination unit that finally determines that the state has occurred, and generates and outputs a cell connection failure final detection signal indicating this; Connection failure detection system of parallel-connected cells, characterized in that comprising a.
[Claim 11]
The apparatus of claim 10 , further comprising: a notification unit generating and outputting an abnormal signal when the cell connection failure final detection signal is output from the cell connection failure final determination unit; Connection failure detection system of parallel-connected cells further comprising a.
[Claim 12]
10. The system of claim 7 or 9, wherein the measured driving discharge data is a change amount of a discharge voltage value.