Title of invention: battery management device and method
Technical field
[One]
This application is an application for claiming priority for Korean Patent Application No. 10-2019-0007120 filed on January 18, 2019, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
[2]
The present invention relates to a battery management apparatus and method, and more particularly, to a battery management apparatus and method capable of managing a battery according to a result of measuring a degree of bending of a battery.
Background
[3]
Secondary batteries with high ease of application and high energy density according to the product group are not only portable devices, but also electric vehicles (EVs) or hybrid vehicles (HEVs) driven by an electric drive source, and power. It is universally applied to a storage device (Energy Storage System). This secondary battery is attracting attention as a new energy source for eco-friendly and energy efficiency enhancement in that it does not generate by-products from the use of energy as well as the primary advantage that it can dramatically reduce the use of fossil fuels.
[4]
The battery pack has a structure in which a plurality of cell assemblies including a plurality of unit cells are connected in series to obtain high output. In addition, the unit cell may be repeatedly charged and discharged by an electrochemical reaction between constituent elements including a positive electrode and a negative electrode current collector, a separator, an active material, and an electrolyte.
[5]
Meanwhile, as the need for a large-capacity structure, including use as an energy storage source, is increasing in recent years, the demand for a multi-module structure battery pack in which a number of secondary batteries are connected in series and/or in parallel is increasing. have.
[6]
Meanwhile, the battery pack may be exposed to various external shocks as it is used in various usage environments. When the battery pack receives an external impact, there is a problem that the inside of the battery pack is damaged due to deformation such as bending in a specific direction. Accordingly, in the related art, as one of various methods of sensing an external shock applied to a battery pack, the shock is detected through a shock sensing method using an elastic body such as a spring.
[7]
However, as described above, in a situation in which the weight of the battery pack gradually increases as the demand for a large-capacity structure increases, there is a limit to a method of detecting an impact with only an elastic body such as a spring.
Detailed description of the invention
Technical challenge
[8]
The present invention has been devised to solve the above problems, and provides a battery management apparatus and method capable of measuring the degree of bending of the battery (bending degree of the battery) and performing a battery protection operation according to the measured degree of bending of the battery. It has its purpose.
Means
[9]
A battery management apparatus according to an aspect of the present invention includes a voltage measuring unit configured to measure a battery voltage of a battery; A bending degree measurement unit provided on at least one side of the battery and configured to measure a battery bending degree of the battery; And receiving the battery voltage from the voltage measuring unit, receiving the battery bending degree from the bending degree measuring unit, and whether the battery voltage is included in any of an overdischarge voltage section, an allowable voltage section, and an overcharge voltage section. A processor configured to set a reference bending degree according to the above, compare a magnitude between the battery bending degree and the reference bending degree, and perform a protection operation on the battery based on the bending degree comparison result.
[10]
The processor sets the reference bending degree to a first reference bending degree when the battery voltage is included in the overdischarge voltage section, and sets the reference bending degree to a second reference bending degree when the battery voltage is included in the allowable voltage section. And when the battery voltage is included in the over-discharge voltage section, the reference bending degree may be set to a third reference bending degree.
[11]
The third reference bending degree may be set to be less than the first reference bending degree and the second reference bending degree.
[12]
When the battery voltage is changed after setting the reference bending degree, the processor may be configured to change the reference bending degree to correspond to the changed battery voltage.
[13]
The processor may be configured to change the set reference bending degree as a reference bending degree corresponding to the changed voltage period when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed.
[14]
The processor sets a reference time so as to correspond to a voltage section to which the battery voltage belongs, compares an excess time elapsed from a point in time when the battery bending degree exceeds the reference bending degree and the length and length of the reference time It may be configured to perform a protection operation on the battery based on the result.
[15]
The processor sets the reference time as a first reference time when the battery voltage is included in the over-discharge voltage period, and sets the reference time as a second reference time when the battery voltage is included in the allowable voltage period. , When the battery voltage is included in the overcharge voltage period, the reference time may be configured to be a third reference time.
[16]
The third reference time may be set to be less than the first reference time and the second reference time.
[17]
When the battery voltage is changed after setting the reference time, the processor may be configured to change the reference time to correspond to the changed battery voltage.
[18]
The processor may be configured to change the set reference time to a reference time corresponding to the changed voltage section when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed.
[19]
When the battery voltage is changed after setting the reference bending degree and the reference time, the processor may be configured to change the reference bending degree and the reference time to correspond to the changed battery voltage.
[20]
The battery may be composed of a battery module including a plurality of battery cells.
[21]
The voltage measurement unit may be configured to measure voltages of the battery module and each of the plurality of battery cells.
[22]
The bending degree measurement unit may be provided on each of the battery module and the plurality of battery cells, and may be configured to measure the bending degree of each of the battery module and the plurality of battery cells.
[23]
The processor determines whether the battery module is defective based on the bending degree comparison result and the time comparison result of the battery module, and when it is determined that the battery module is defective, It may be configured to detect an abnormal cell among the plurality of battery cells based on the result of comparing the degree of bending of the battery and the result of comparing the time.
[24]
A battery pack according to another aspect of the present invention may include a battery management apparatus according to an aspect of the present invention.
[25]
A battery management method according to another aspect of the present invention includes a voltage measurement step of measuring a battery voltage of a battery; A bending degree measuring step of measuring a battery bending degree of the battery; A reference bending degree setting step of setting a reference bending degree according to whether the battery voltage is included in any of an overdischarge voltage period, an allowable voltage period, and an overcharge voltage period; And performing a protection operation for comparing a magnitude between the battery bending degree and a reference bending degree, and performing a protection operation on the battery based on a result of the bending degree comparison.
Effects of the Invention
[26]
According to an aspect of the present invention, when an external shock is applied to a battery or a battery swelling phenomenon occurs, an accident that may be caused by the battery may be prevented by performing a protection operation on the battery.
[27]
In addition, according to an aspect of the present invention, by changing the reference bending degree and/or the reference time according to the voltage of the battery, there is an advantage that the battery protection operation can be performed to correspond to the current state of the battery.
[28]
The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.
Brief description of the drawing
[29]
The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings. It is limited to and should not be interpreted.
[30]
1 is a schematic diagram of a battery management apparatus according to an embodiment of the present invention.
[31]
2 is a diagram illustrating an exemplary configuration of a battery pack including a battery management apparatus according to an embodiment of the present invention.
[32]
3 is a diagram showing an exemplary configuration of a battery according to an embodiment of the present invention.
[33]
4 is a diagram showing an exemplary configuration of another battery pack including a battery management apparatus according to an embodiment of the present invention.
[34]
5 is a diagram illustrating another exemplary configuration of a battery management apparatus and a battery according to an embodiment of the present invention.
[35]
6 is a diagram illustrating a perspective view of the battery of FIG. 5.
[36]
7 is a view showing another exemplary configuration of a battery management device and a battery according to an embodiment of the present invention.
[37]
8 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention.
[38]
9 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention.
Mode for carrying out the invention
[39]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[40]
1 is a schematic diagram of a battery management apparatus 10 according to an embodiment of the present invention. 2 is a diagram showing an exemplary configuration of a battery pack 100 including the battery management device 10 according to an embodiment of the present invention.
[41]
Referring to FIG. 2, the battery pack 100 may include one or more batteries 110 and a battery management device 10.
[42]
Here, the battery 110 may be a battery cell or a battery module.
[43]
That is, the battery 110 includes a negative terminal and a positive terminal, and may be an independent cell that can be physically separated. For example, a pouch-type lithium polymer cell and/or a cylindrical cell may be regarded as the battery 110. In addition, the battery 110 may be a battery module in which one or more battery cells are connected in series and/or in parallel. However, hereinafter, for convenience of description, the battery 110 will be described as being a battery cell.
[44]
1 and 2, the battery management apparatus 10 according to an embodiment of the present invention may include a voltage measurement unit 11, a bending degree measurement unit 12, and a processor 13.
[45]
The voltage measurement unit 11 may be configured to measure the battery voltage of the battery 110. To this end, the voltage measurement unit 11 may include a voltage sensor.
[46]
The voltage measurement unit 11 may periodically measure the battery voltage of the battery 110 and output a measurement signal representing the measured battery voltage to the processor 13.
[47]
For example, in the embodiment of FIG. 2, the voltage measurement unit 11 may be connected to both ends of the battery 110 through a plurality of sensing lines. In addition, the voltage measurement unit 11 may measure the battery voltage based on voltages across both ends of the battery 110 measured by a plurality of sensing lines.
[48]
The bending degree measuring unit 12 may be provided on at least one side of the battery 110 and configured to measure the battery bending degree of the battery 110. To this end, the bending degree measurement unit 12 may include a flexible sensor whose resistance value is changed according to the degree of bending.
[49]
Here, the degree of bending of the battery may mean the degree to which the battery 110 is bent. For example, an external force is applied to the battery 110 so that the battery 110 may be bent. In addition, as the battery 110 swells due to a swelling phenomenon, the battery 110 may be bent. Accordingly, the bending degree measurement unit 12 is attached to one surface of the battery 110 to measure the degree of bending of the battery with respect to the degree to which the battery 110 is bent, and output the measured degree of bending of the battery.
[50]
3 is a diagram showing an exemplary configuration of a battery 110 according to an embodiment of the present invention. Specifically, FIG. 3 is a diagram illustrating an example in which the bending degree measuring unit 12 of the battery management apparatus 10 according to an embodiment of the present invention is attached to the battery 110.
[51]
For example, referring to FIG. 3, when the battery 110 is a pouch-type battery cell, the bending degree measurement unit 12 may be attached to the outer surface of the battery 110. In addition, the bending degree measurement unit 12 may measure the degree to which the battery 110 is bent due to an external impact and/or a swelling phenomenon.
[52]
The bending degree measurement unit 12 may periodically measure the battery bending degree of the battery 110 and output a measurement signal indicating the measured battery bending degree to the processor 13.
[53]
For example, the bending degree measurement unit 12 may output a natural number between “0” and “100” as the bending degree. When there is no change in the external shape of the battery 110, the degree of bending of the battery may be measured as "0". When a change in the external shape of the battery 110 occurs, the measured battery bending degree may be greater than “0”.
[54]
The processor 13 may be operatively coupled to the voltage measurement unit 11 and the bending degree measurement unit 12. In addition, the processor 13 may receive the battery voltage from the voltage measuring unit 11. In addition, the processor 13 may receive the battery bending degree from the bending degree measuring unit 12.
[55]
For example, in the embodiment of FIG. 2, the voltage measurement unit 11 and the bending degree measurement unit 12 may be electrically connected to the processor 13. In addition, the battery voltage output from the voltage measurement unit 11 may be input to the processor 13. In addition, the bending degree of the battery output from the bending degree measuring unit 12 may be input to the processor 13.
[56]
The processor 13 may be configured to set a reference bending degree according to whether the battery voltage is included in any of the over-discharge voltage section, the allowable voltage section, and the over-charge voltage section.
[57]
That is, the processor 13 may set the reference bending degree for the battery 110 according to the voltage section to which the battery voltage of the battery 110 belongs.
[58]
Specifically, the processor 13 may check whether the battery voltage received from the voltage measuring unit 11 is included in any of the over-discharge voltage section, the allowable voltage section, and the over-charge voltage section. In addition, the processor 13 may set the reference bending degree according to the voltage section including the battery voltage.
[59]
Here, the overdischarge voltage section, the allowable voltage section, and the overcharge voltage section may be preset voltage sections according to the voltage specification of the battery 110.
[60]
The over-discharge voltage section may be a voltage section less than the allowable voltage section. In addition, the over-discharge voltage section may mean a voltage section in which deterioration of the battery 110 is accelerated due to a low voltage. For example, assuming that the battery 110 is a battery cell having a general 4.5[V] specification, the overdischarge voltage period may be a period of 0[V] or more and less than 2[V].
[61]
In addition, the allowable voltage section may be a voltage section in which charging and discharging of the battery 110 is allowed. That is, the allowable voltage section may be a voltage section in which the state of the battery 110 can be determined to be a normal state. Accordingly, when the battery voltage of the battery 110 is included in the allowable voltage period, it can be used while maintaining a normal state so that deterioration of the battery 110 is not accelerated. For example, assuming that the battery 110 is a battery cell having a general 4.5[V] specification, the allowable voltage period may be a period of 2[V] or more and less than 4[V].
[62]
The overcharge voltage section may be a voltage section exceeding the allowable voltage section. In addition, the overcharge voltage section may mean a voltage section in which deterioration of the battery 110 is accelerated due to a high voltage. For example, assuming that the battery 110 is a battery cell having a general 4.5[V] specification, the overcharge voltage period may be a period of 4[V] or more and less than 6[V].
[63]
In addition, in each of the over-discharge voltage section, the allowable voltage section, and the over-charge voltage section, a corresponding bending degree may be preset to be different from each other.
[64]
The bending degree corresponding to the overdischarge voltage section may be set as the first reference bending degree. The bending degree corresponding to the allowable voltage section may be set as the second reference bending degree. The bending degree corresponding to the overcharge voltage section may be set to a third reference bending degree.
[65]
For example, when the battery voltage is included in the over-discharge voltage section, the processor 13 may set the reference bending degree to the first reference bending degree. In addition, when the battery voltage is included in the allowable voltage section, the processor 13 may set the reference bending degree to the second reference bending degree. Also, when the battery voltage is included in the overcharge voltage section, the processor 13 may set the reference bending degree to the third reference bending degree.
[66]
The processor 13 may be configured to compare a magnitude between the battery bending degree and the reference bending degree.
[67]
Specifically, the reference bending degree may be set to a reference bending degree corresponding to a voltage section in which the battery voltage of the battery 110 is included. That is, the processor 13 may compare a size between the reference bending degree set based on the battery voltage of the battery 110 and the battery bending degree measured by the bending degree measuring unit 12.
[68]
Further, the processor 13 may be configured to perform a protection operation on the battery based on a result of comparing the bending degree.
[69]
Specifically, if the battery bending degree is greater than the reference bending degree, the processor 13 may determine that the battery 110 is defective. Accordingly, the processor 13 may perform the protection operation to stop the use of the defective battery 110. In addition, when a defect of the battery 110 is detected in the test step, the processor 13 may perform the protection operation so that the defective battery 110 can be easily classified.
[70]
For example, in the embodiment of FIG. 2, it is assumed that the battery 110 has a defect, so that the battery bending degree is greater than the reference bending degree. The processor 13 may block charging and discharging of the battery 110 by controlling the operation state of the main relay 120 to a turn-off state.
[71]
Here, the main relay 120 may energize or block a high current path through which the charging current and the discharging current of the battery 110 flows according to the operating state. In the embodiment of FIG. 2, a path to which the positive terminal (P+) of the battery pack 100, the battery 110, and the negative terminal (P-) of the battery pack 100 are connected may be a high current path. The main relay 120 may be disposed in the high current path.
[72]
That is, the protection operation performed by the processor 13 may be an operation of blocking a high current path to the battery 110 so that the battery 110 cannot be used.
[73]
Another embodiment of the protection operation for the battery 110 performed by the processor 13 will be described with reference to FIG. 4.
[74]
4 is a diagram showing an exemplary configuration of another battery pack 100 including the battery management apparatus 10 according to an embodiment of the present invention.
[75]
In the embodiment of FIG. 4, the battery pack 100 may further include a fuse 130.
[76]
Preferably, the fuse 130 may be disposed in a high current path. In addition, the fuse 130 here may be a general fuse element that is cut when a high current flows or overheats.
[77]
For example, in the embodiment of FIG. 4, it is assumed that the battery 110 has a defect, so that the degree of bending of the battery is greater than that of the reference degree. In order to perform the protection operation, the processor 13 may control the operation state of the main relay 120 to a turn-off state as in the embodiment of FIG. 2. In addition, the processor 13 may cut the fuse 130 in order to perform a protection operation. To this end, the processor 13 may output a high voltage signal to the fuse 130 or operate a fuse cutting unit (not shown) capable of directly cutting the fuse 130.
[78]
Since the battery management apparatus 10 according to an embodiment of the present invention determines the presence or absence of a defect in the battery 110 in consideration of various states (battery voltage and battery bending degree) of the battery 110, the battery 110 The presence or absence of a defect can be determined more accurately.
[79]
In addition, when it is determined that the battery 110 is defective, the battery management apparatus 10 performs a protection operation, thereby preventing the defective battery 110 from being used. Accordingly, accidents that may be caused by the use of the defective battery 110 can be prevented.
[80]
[81]
Preferably, the third reference bending degree may be preset to be less than the first reference bending degree and the second reference bending degree.
[82]
Here, the third reference bending degree is a reference bending degree set to correspond to the overcharge voltage section. In addition, it may be determined whether or not to perform a protection operation for the battery 110 through a comparison between the reference bending degree and the battery bending degree.
[83]
For example, it is assumed that the first reference bending degree is set to 60, the second reference bending degree is set to 50, and the third reference bending degree is set to 30. In addition, it is assumed that the bending degree of the battery measured by the bending degree measuring unit 12 is 40.
[84]
In this case, when the battery voltage is included in the over-discharge voltage period or the allowable voltage period, since the reference bending degree is greater than the battery bending degree, the processor 13 may not perform a protection operation for the battery 110.
[85]
Conversely, when the battery voltage is included in the overcharge voltage section, the reference bending degree may be set to the third reference bending degree. That is, the reference bending degree may be smaller than the battery bending degree. Accordingly, the processor 13 may perform a protection operation for the battery 110.
[86]
In general, when the voltage of the battery 110 is included in the overcharge voltage section than when the voltage of the battery 110 is included in the allowable voltage section or the overdischarge voltage section, the internal energy of the battery 110 may be higher. That is, when the battery voltage is included in the overcharge voltage section, the battery 110 may be vulnerable to external shock. Therefore, when the battery voltage is included in the overcharging section, even if a relatively small external shock is applied to the battery 110, there is a high possibility that an accident such as ignition or explosion of the battery 110 may occur.
[87]
Accordingly, the battery management apparatus 10 according to an embodiment of the present invention sets different reference bending degrees according to the voltage section in which the voltage of the battery 110 is included, so that the higher the voltage of the battery 110 is, the more the battery bends. It is possible to more sensitively detect the defect of the battery 110 according to the diagram.
[88]
[89]
More preferably, the first reference bending degree, the second reference bending degree, and the third reference bending degree may be set to be lower in the order of the bending degree.
[90]
For example, in the overcharge voltage section in which the battery voltage is the highest, the third reference bending degree is set to the lowest, so that the protection operation may be performed even if a relatively small impact is applied to the battery 110.
[91]
In addition, when the battery voltage is included in the over-discharge voltage section, since the internal energy of the battery 110 is relatively low, the first reference bending degree is set to the highest so that the protection operation is flexible according to the state of the battery 110. Can be done.
[92]
That is, since the battery management apparatus 10 according to an embodiment of the present invention performs a protection operation in consideration of both the battery voltage and the battery bending degree of the battery 110, it is adaptive and flexible to the state of the battery 110. The protection operation can be performed.
[93]
[94]
When the battery voltage is changed after setting the reference bending degree, the processor 13 may be configured to change the reference bending degree to correspond to the changed battery voltage.
[95]
The voltage measurement unit 11 may periodically measure the battery voltage of the battery 110 and output the measured battery voltage to the processor 13. Therefore, the processor 13 sets the reference bending degree based on the previously received battery voltage, and then changes the reference bending degree based on the new battery voltage when the newly received new battery voltage is different from the previous battery voltage. I can.
[96]
Specifically, the processor 13 may be configured to change the set reference bending degree as a reference bending degree corresponding to the changed voltage period when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed.
[97]
For example, as in the previous embodiment, the over-discharge voltage section is a section between 0[V] and less than 2[V], the allowable voltage section is a section between 2[V] and less than 4[V], and the overcharge voltage section is 4 It is assumed that the interval is greater than [V].
[98]
If the battery voltage is 3 [V] at the first point in time, the processor 13 may set the reference bending degree to the second reference bending degree. Thereafter, when the battery contact pressure is changed to 4 [V] at the second point in time, the processor 13 may change the reference bending degree set as the second reference bending degree to the third reference bending degree. In this case, since the reference bending degree at the second time point is smaller than the reference bending degree at the first time point, the protection operation may be performed according to the battery bending degree.
[99]
That is, the battery management apparatus 10 according to an embodiment of the present invention has the advantage of performing an appropriate protection operation corresponding to the state of the battery 110 by changing the reference bending degree corresponding to the change of the battery voltage. .
[100]
[101]
The processor 13 may be configured to set a reference time to correspond to a voltage section to which the battery voltage belongs.
[102]
Specifically, the processor 13 may set the reference time according to whether the battery voltage is included in any of the over-discharge voltage period, the allowable voltage period, and the over-charge voltage period.
[103]
Preferably, the reference time corresponding to the over-discharge voltage section may be set as the first reference time. The reference time corresponding to the allowable voltage period may be set as the second reference time. The reference time corresponding to the overcharge voltage period may be set as the third reference time.
[104]
For example, the first reference time may be set to 50 ms, the second reference time may be set to 40 ms, and the third reference time may be set to 30 ms.
[105]
That is, the processor 13 sets the reference time to a first reference time when the battery voltage is included in the over-discharge voltage period, and sets the reference time to a second reference time when the battery voltage is included in the allowable voltage period. And when the battery voltage is included in the overcharge voltage section, the reference time may be set as a third reference time.
[106]
The processor 13 may be configured to compare an excess time elapsed from a point in time when the battery bending degree exceeds the reference bending degree and the length and length of the reference time.
[107]
Specifically, the processor 13 may set a reference bending degree and a reference time according to a voltage section in which the battery voltage is included. In addition, the excess time may be measured from when the battery bending degree measured by the bending degree measuring unit 12 exceeds a set reference bending degree. Preferably, the excess time may be measured until the degree of bending of the battery becomes less than or equal to the reference degree of bending, or the protection operation for the battery 110 is performed.
[108]
That is, before the protection operation for the battery 110 is performed, and while the excess time is being measured, if the battery bending degree becomes less than the reference bending degree, the measured excess time may be reset. In addition, when the protection operation for the battery 110 is performed, the measured excess time may be reset.
[109]
The processor 13 may be configured to perform a protection operation on the battery 110 based on the time comparison result.
[110]
Specifically, when the excess time exceeds the reference time, the processor 13 may perform a protection operation for the battery 110.
[111]
For example, it is assumed that the reference time is set to 50 ms, and the battery bending degree measured at the first time point exceeds the reference bending degree. Since the battery bending degree exceeds the reference bending degree, the processor 13 may measure the excess time by using the first time point as a base point. If the measured excess time exceeds 50 ms, the processor 13 may perform a protection operation for the battery 110. Conversely, when the measured excess time is 50 ms or less, and the battery bending degree is changed to the reference bending degree or less, the processor 13 may reset the measured excess time.
[112]
The battery management apparatus 10 according to an embodiment of the present invention considers the time during which the bending degree of the battery is maintained (the excess time), and protects the battery 110 when it is determined that a continuous external shock or swelling phenomenon has occurred. You can perform the operation.
[113]
Therefore, in a situation where the state of the battery 110 returns to a normal state after an instantaneous shock is applied to the battery 110, the processor 13 is used so that the battery 110 and the battery pack 100 can be used for a long time. The protection operation may not be performed.
[114]
[115]
Preferably, the third reference time may be set to be less than the first reference time and the second reference time.
[116]
That is, like the reference bending degree, the reference time may be set differently from each other according to the voltage section in which the battery voltage of the battery 110 is included.
[117]
As described above, when the battery voltage is included in the overcharge voltage period, the internal energy of the battery 110 may be relatively high. In this case, even if the external shock to the battery 110 is maintained only for a relatively short period of time, an accident such as the battery 110 exploding may occur. In addition, since the internal energy of the battery 110 is high, the degree of an accident such as an explosion may be large.
[118]
Accordingly, the battery management apparatus 10 according to an embodiment of the present invention sets the third reference time to be shorter than the first reference time and the second reference time, so that an accident due to the battery 110 occurs in consideration of the battery voltage. There is an advantage that can prevent it from becoming.
[119]
[120]
When the battery voltage is changed after setting the reference time, the processor 13 may be configured to change the reference time to correspond to the changed battery voltage.
[121]
The voltage measurement unit 11 may periodically measure the battery voltage of the battery 110 and output the measured battery voltage to the processor 13. Accordingly, after setting the reference time based on the previously received battery voltage, the processor 13 may change the reference time based on the new battery voltage when the newly received battery voltage is different from the previous battery voltage. .
[122]
Specifically, when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed, the processor 13 may be configured to change the set reference time to a reference time corresponding to the changed voltage section.
[123]
For example, as in the previous embodiment, the over-discharge voltage section is a section between 0[V] and less than 2[V], the allowable voltage section is a section between 2[V] and less than 4[V], and the overcharge voltage section is 4 It is assumed that the interval is greater than [V].
[124]
If the battery voltage is 3 [V] at the first point in time, the processor 13 may set the reference time as the second reference time. Thereafter, when the battery voltage is changed to 4 [V] at the second point in time, the processor 13 may change the reference time set as the second reference time to the third reference time.
[125]
In this case, since the reference time at the second time point is shorter than the reference time at the first time point, the protection operation may be performed according to the excess time measured from when the battery bending degree exceeds the reference bending degree.
[126]
That is, the battery management apparatus 10 according to an embodiment of the present invention has the advantage of performing an appropriate protection operation corresponding to the state of the battery 110 by changing the reference time corresponding to the change of the battery voltage.
[127]
[128]
More preferably, when the battery voltage is changed after setting the reference bending degree and the reference time, the processor 13 may be configured to change the reference bending degree and the reference time to correspond to the changed battery voltage. have.
[129]
That is, after the reference bending degree and the reference time are set, when the battery voltage is changed to be included in another voltage section, the processor 13 uses the reference bending degree and reference time set in the voltage section including the changed battery voltage. And each of the reference times may be changed.
[130]
The battery management apparatus 10 according to an embodiment of the present invention changes the reference bending degree and the reference time to correspond to a change in the state of the battery 110 (eg, a change in the battery voltage) to protect the battery 110 There is an advantage to be able to perform the operation. Accordingly, the battery management apparatus 100 has an advantage of preventing unexpected accidents caused by the battery 110 by performing an appropriate protection operation corresponding to the state of the battery 110.
[131]
[132]
Hereinafter, various embodiments of the battery pack 100 including the battery management device 10 will be described. Note that the contents overlapping with the contents described above will be omitted.
[133]
5 is a view showing another exemplary configuration of the battery management apparatus 10 and the battery 110 according to an embodiment of the present invention. Specifically, FIG. 5 is a diagram illustrating an example in which the bending degree measurement unit 12 of the battery management apparatus 10 according to an embodiment of the present invention is attached to the battery module 140.
[134]
6 is a diagram illustrating a perspective view of the battery of FIG. 5. Specifically, FIG. 6 is a diagram illustrating a perspective view of the battery module 140.
[135]
Here, the battery 110 may be composed of a battery module 140 including a plurality of battery cells 110a to 110e. That is, in the embodiments of FIGS. 5 and 6, the battery module 140 including the plurality of battery cells 110a to 110e may be regarded as the battery 110.
[136]
For example, referring to FIGS. 5 and 6, the battery module 140 includes a first battery cell 110a, a second battery cell 110b, a third battery cell 110c, a fourth battery cell 110d, and a fourth battery cell 110d. 5 battery cells 110e may be included.
[137]
The voltage measurement unit 11 may measure the battery voltage of the battery module 140, and the bending degree measurement unit 12 may measure the battery bending degree of the battery module 140. In particular, referring to FIGS. 5 and 6, the bending degree measuring unit 12 is attached to one surface of the battery module 140 to measure the battery bending degree of the battery module 140.
[138]
Further, the processor 13 may perform a protection operation of the battery module 140 based on the battery voltage and the battery bend.
[139]
That is, the battery management apparatus 10 according to an embodiment of the present invention has an advantage of performing a protection operation for not only the battery cell but also the battery module 140 according to a voltage and a degree of bending.
[140]
[141]
7 is a view showing another exemplary configuration of the battery management apparatus 10 and a battery according to an embodiment of the present invention.
[142]
In the embodiment of FIG. 7, similar to the embodiments of FIGS. 5 and 6, the battery module 140 including a plurality of battery cells 110a to 110e may be regarded as the battery 110.
[143]
The voltage measuring unit 11 may be configured to measure voltages of the battery module 140 and each of the plurality of battery cells 110a to 110e.
[144]
For example, in the embodiment of FIG. 7, the voltage measurement unit 11 may be connected to each electrode of the plurality of battery cells 110a to 110e. In addition, the voltage measurement unit 11 may measure voltages of each of the battery module 140 and the plurality of battery cells 110a to 110e.
[145]
The bending degree measurement unit 12 is provided in each of the battery module 140 and the plurality of battery cells 110a to 110e, and each of the battery module 140 and the plurality of battery cells 110a to 110e It can be configured to measure the degree of bending.
[146]
Preferably, the bending degree measurement unit 12 may be attached to each of the battery module 140 and the plurality of battery cells 110a to 110e.
[147]
For example, the bending degree measurement unit 12 may be attached to the battery module 140. The first bending degree measuring unit 12a may be attached to the first battery cell 110a. The second bending degree measuring unit 12b may be attached to the second battery cell 110b. The third bending degree measuring unit 12c may be attached to the third battery cell 110c. The fourth bending degree measuring unit 12d may be attached to the fourth battery cell 110d. The fifth bending degree measurement unit 12e may be attached to the fifth battery cell 110e.
[148]
The processor 13 may be configured to determine whether the battery module 140 has a defect based on a result of comparing a bending degree of the battery module 140 and a result of comparing a time.
[149]
That is, the processor 13 may perform defect detection on the battery module 140 before comparing the battery bending degree and excess time for each of the plurality of battery cells 110a to 110e with the reference bending degree and the reference time. have.
[150]
For example, when the battery bending degree of the battery module 140 is less than the reference bending degree and the excess time is also less than the reference time, the processor 13 may determine that the battery module 140 is not defective. In this case, the processor 13 may omit the detection of defects for each of the plurality of battery cells 110a to 110e.
[151]
That is, the battery management device 10 first detects a defect in the battery module 140 and then detects a defect for each of the plurality of battery cells 110a to 110e only when a defect is detected in the battery module 140 By doing so, there is an advantage in that the total time required for detecting a defect in the battery 110 can be shortened.
[152]
As a specific example, when the battery bending degree of the battery module 140 exceeds the reference bending degree and the excess time also exceeds the reference time, the processor 13 may determine that the battery module 140 is defective. In this case, the processor 13 may perform defect detection for each of the plurality of battery cells 110a to 110e. That is, the processor 13 may perform defect detection for each of the plurality of battery cells 110a to 110e in order to detect an abnormal cell that causes a defect.
[153]
Thereafter, when a battery cell whose battery bending degree exceeds the reference bending degree and the excess time exceeds the reference time is detected among the plurality of battery cells 110a to 110e, the processor 13 operates to protect the battery 110 You can do it. In addition, the processor 13 has an advantage of providing information on a faulty cell causing a defect by providing information on the detected battery cell.
[154]
[155]
8 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention. Here, the battery management method may be performed by each component of the battery management device 10.
[156]
8, a battery management method according to another embodiment of the present invention includes a voltage measurement step (S100), a bending degree measurement step (S200), a reference bending degree setting step (S300), and a protection operation execution step (S400). Can include.
[157]
The voltage measurement step S100 is a step of measuring the battery voltage of the battery 110 and may be performed by the voltage measuring unit 11.
[158]
For example, in the embodiment of FIG. 4, the voltage measurement unit 11 may measure the battery voltage of the battery 110 through measurement lines connected to both ends of the battery 110.
[159]
The bending degree measurement step S200 is a step of measuring the battery bending degree of the battery 110, and may be performed by the bending degree measurement unit 12.
[160]
For example, in the embodiment of FIG. 3, the bending degree measurement unit 12 is attached to one surface of the battery 110 to measure the battery bending degree of the battery 110.
[161]
The reference bending degree setting step (S300) is a step of setting a reference bending degree according to whether the battery voltage is included in any of the overdischarge voltage period, the allowable voltage period, and the overcharge voltage period, Can be done.
[162]
First, the processor 13 may determine in which voltage section the battery voltage measured in the voltage measurement step S100 is included in the overdischarge voltage section, the allowable voltage section, and the overcharge voltage section.
[163]
Thereafter, the processor 13 may set the reference bending degree based on the reference bending degree corresponding to the voltage section including the battery voltage. For example, when the battery voltage is included in the allowable voltage section, the processor 13 may set the reference bending degree based on the second reference bending degree corresponding to the allowable voltage. That is, the processor 13 may set the second reference bending degree to the reference bending degree.
[164]
The protection operation performing step (S400) is a step of comparing the magnitude between the battery bending degree and the reference bending degree, and performing a protection operation on the battery 110 based on the bending degree comparison result, performed by the processor 13 Can be.
[165]
When the battery bending degree exceeds the reference bending degree, the processor 13 may perform a protection operation on the battery 110. For example, in the embodiment of FIG. 4, as the protection operation, the processor 13 may cut the fuse 130 or control the operation state of the main relay 120 to a turn-off state.
[166]
[167]
9 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention. Here, the battery management method may be performed by each component of the battery management device 10. Note that, hereinafter, only steps added or changed in the method of FIG. 8 will be described.
[168]
Referring to FIG. 9, the battery management method according to another embodiment of the present invention may further include a reference time setting step (S500) and a protection operation performing step (S600 ).
[169]
In the reference time setting step (S500), after the reference bending degree setting step (S300), setting a reference time according to whether the battery voltage is included in any of the over-discharge voltage section, the allowable voltage section, and the over-charge voltage section. As, it may be performed by the processor 13.
[170]
The processor 13 may set a reference time based on a reference time corresponding to a voltage section in which the battery voltage is included. For example, when the battery voltage is included in the allowable voltage period, the processor 13 may set the reference time based on the second reference time corresponding to the allowable voltage. That is, the processor 13 may set the second reference time as the reference time.
[171]
The protection operation performing step (S600) protects the battery 110 based on a result of comparing the degree of bending between the battery bending degree and the reference degree of bending, and a time comparison result of comparing the length and length between the excess time and the reference time. As a step of performing an operation, it may be performed by the processor 13.
[172]
The protecting operation performing step S600 of FIG. 9 may be a step different from that of the protecting operation performing step S400 of FIG. 8. Specifically, the step of performing the protection operation (S600) of FIG. 9 may be different in that the time comparison result is further considered compared to the step (S400) of performing the protection operation of FIG. 8.
[173]
For example, the processor 13 may perform a protection operation on the battery 110 when the battery bending degree exceeds the reference bending degree, and the excess time in which the battery bending degree exceeds the reference bending degree exceeds the reference time. have. That is, the processor 13 may perform a protection operation for the battery 110 when the state in which the battery bending degree exceeds the reference bending degree persists longer than the reference time.
[174]
According to such a battery management method, there is an advantage in that an accident caused by the battery 110 due to an external shock or a swelling phenomenon can be prevented in advance.
[175]
[176]
Although the present invention in the above has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims.
[177]
[178]
(Explanation of code)
[179]
10: battery management device
[180]
11: voltage measuring unit
[181]
12: bending degree measurement unit
[182]
13: processor
[183]
100: battery pack
[184]
110: battery
[185]
120: main relay
[186]
130: fuse
[187]
140: battery module
Claims
[Claim 1]
A voltage measuring unit configured to measure a battery voltage of the battery; A bending degree measurement unit provided on at least one side of the battery and configured to measure a battery bending degree of the battery; And receiving the battery voltage from the voltage measuring unit, receiving the battery bending degree from the bending degree measuring unit, and whether the battery voltage is included in any of the overdischarge voltage section, the allowable voltage section, and the overcharge voltage section. A battery management apparatus comprising a processor configured to set a reference bending degree according to, to compare a magnitude between the battery bending degree and the reference bending degree, and to perform a protection operation on the battery based on the bending degree comparison result. .
[Claim 2]
The method of claim 1, wherein the processor sets the reference bending degree as a first reference bending degree when the battery voltage is included in the overdischarge voltage period, and the reference bending degree when the battery voltage is included in the allowable voltage period. Is set to a second reference bending degree, and when the battery voltage is included in the overdischarge voltage section, the reference bending degree is set to a third reference bending degree.
[Claim 3]
The battery management apparatus of claim 2, wherein the third reference bending degree is set to be less than the first reference bending degree and the second reference bending degree.
[Claim 4]
The battery management apparatus of claim 2, wherein the processor is configured to change the reference bending degree to correspond to the changed battery voltage when the battery voltage is changed after setting the reference bending degree.
[Claim 5]
The battery according to claim 4, wherein the processor is configured to change the set reference bending degree to a reference bending degree corresponding to the changed voltage period when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed. Management device.
[Claim 6]
The method of claim 1, wherein the processor sets a reference time so as to correspond to a voltage section to which the battery voltage belongs, and an excess time elapsed from a point in time when the battery bending degree exceeds the reference bending degree and a long and short length of the reference time And performing a protection operation on the battery based on a time comparison result.
[Claim 7]
The method of claim 6, wherein the processor sets the reference time as a first reference time when the battery voltage is included in the overdischarge voltage period, and determines the reference time when the battery voltage is included in the allowable voltage period. 2 as a reference time, and when the battery voltage is included in the overcharge voltage section, the battery management apparatus is configured to set the reference time to a third reference time.
[Claim 8]
The battery management apparatus of claim 7, wherein the third reference time is set to be less than the first reference time and the second reference time.
[Claim 9]
The battery management apparatus of claim 7, wherein, when the battery voltage is changed after setting the reference time, the processor is configured to change the reference time to correspond to the changed battery voltage.
[Claim 10]
The battery management of claim 9, wherein the processor is configured to change the set reference time to a reference time corresponding to the changed voltage section when the battery voltage is changed and the voltage section to which the battery voltage belongs is changed. Device.
[Claim 11]
The method of claim 6, wherein the processor is configured to change the reference bending degree and the reference time to correspond to the changed battery voltage when the battery voltage is changed after setting the reference bending degree and the reference time. Battery management device.
[Claim 12]
The battery management apparatus of claim 6, wherein the battery comprises a battery module including a plurality of battery cells.
[Claim 13]
The battery according to claim 12, wherein the voltage measurement unit is configured to measure voltages of the battery module and the plurality of battery cells, and the bending degree measurement unit is provided on each of the battery module and the plurality of battery cells, and the battery It is configured to measure a bending degree of each of the module and the plurality of battery cells, and the processor determines whether the battery module is defective based on a result of comparing the degree of bending of the battery module and a result of comparing the time, and When it is determined that the module is defective, the battery management apparatus is configured to detect an abnormal cell among the plurality of battery cells based on a result of comparing a bending degree of each of the plurality of battery cells and a result of comparing a time.
[Claim 14]
A battery pack comprising the battery management device according to any one of claims 1 to 13.
[Claim 15]
A voltage measurement step of measuring a battery voltage of the battery; A bending degree measuring step of measuring a battery bending degree of the battery; A reference bending degree setting step of setting a reference bending degree according to whether the battery voltage is included in any of an overdischarge voltage period, an allowable voltage period, and an overcharge voltage period; And performing a protection operation for comparing a magnitude between the battery bending degree and a reference bending degree, and performing a protection operation on the battery based on the bending degree comparison result.