The present invention relates to a battery device, and more particularly, to a battery device capable of preventing electrical damage to a BMS when a battery cell is connected to a BMS (Battery Management System).
background art
[2]
Secondary batteries that can be charged and discharged, that is, batteries, are widely used as energy sources for mobile devices such as smart phones. In addition, batteries are used as energy sources for electric vehicles and hybrid electric vehicles, which are proposed as a solution to air pollution caused by gasoline vehicles and diesel vehicles using fossil fuels.
[3]
The types of applications using batteries are diversifying due to the advantages of batteries, and it is expected that batteries will be applied to more fields and products in the future.
[4]
Batteries are classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc. according to the composition of electrodes and electrolytes. .
[5]
Although batteries are widely used as an energy source for various products, there is a risk of overcharging, overcurrent, and other physical external shocks such as overheating and explosion because they contain various inflammable materials. To prevent these problems, a protection circuit that cuts off current in case of overcharge, overdischarge, and overcurrent, a PTC element (Positive Temperature Coefficient Element) that cuts off current by greatly increasing resistance when temperature rises, and a current that cuts off current when pressure rises due to gas generation A safety system such as a safety vent that blocks or exhausts gas is provided, and a multi-cell structured mid-large sized battery pack consisting of a combination of multiple battery modules has a Safety systems such as fuses, bimetals, and battery management systems (BMS) are provided.
[6]
The BMS is electrically connected to a plurality of battery cells. At this time, when connecting the battery cells and the BMS, each battery cell should be electrically connected to the cell connection terminal of the BMS to prevent damage to the IC due to the influence of internal relative potential and absolute voltage withstand voltage of the integrated circuit (IC). That is, in the process of electrically connecting the battery cell and the integrated circuit (IC) of the BMS, breakdown voltage values for each connection terminal of the IC may be different, causing the IC to be destroyed by high voltage.
[7]
As a conventional method for solving this problem, a method of first physically connecting the battery cell and the BMS by applying a solder eye and then electrically connecting them may be used. Here, the solder eye is a structure in which an insulating portion is included on a terminal connection member, and electrical connection is not made in the process of arranging battery cells, but is electrically connected in the process of coupling electrode terminals and terminal connection members. say structure. However, this method has a problem of increasing manufacturing cost due to the addition of materials and processes.
[8]
As another conventional method for solving the above problem, a method in which workers perform soldering in an orderly manner is used. That is, it is necessary to sequentially connect to the BMS from a low battery cell to a high battery cell. For example, assuming that the first to nth battery cells are arranged from bottom to top, the first to nth battery cells are sequentially connected to the BMS. However, in this method, there is a possibility of occurrence of defects due to the inexperience of the operator. That is, when soldering is not performed sequentially from low battery cells, cell power may be randomly applied to the BMS IC, causing electrical damage to the IC. In other words, the power for IC operation is received from the battery cell, but if the ground is not connected first or if it is connected from the middle of the 1st to nth battery cells, for example, 4.2V or more should not be applied to the input pin of the IC. However, as two or more battery cells are connected, more than the allowable voltage is applied to the IC, resulting in electrical damage. Electrical damage occurs when a current or voltage is applied in excess of a permissible value, resulting in a failure of the IC.
[9]
As a prior art document known in this regard, there is Korean Patent Registration No. 10-1680189.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[10]
The present invention provides a battery device in which a battery cell and a BMS are sequentially electrically connected.
[11]
The present invention provides a battery device having a switching circuit to automatically cut off a path through which the voltage of a lower battery cell is input to a BMS when the voltage of a lower battery cell is not input.
[12]
means of solving the problem
[13]
A battery device according to an aspect of the present invention includes a plurality of battery cells; a BMS managing the plurality of battery cells; and a connection control unit for sequentially connecting the plurality of battery cells to the BMS, wherein the connection control unit connects the corresponding battery cell to the BMS according to the potential of the lower battery cell and the potential of the corresponding battery cell.
[14]
The connection controller sequentially connects the BMS from the lowermost battery cell to the uppermost battery cell in one direction.
[15]
The connection control unit allows the battery cells to be connected to the BMS when they are connected sequentially instead of being connected to the BMS when random battery cells are connected.
[16]
The connection control unit is mounted on a substrate on which the BMS is mounted.
[17]
The connection controller is provided between a plurality of connection terminals respectively extending from the plurality of battery cells and an IC connection terminal of the BMS.
[18]
The connection control unit includes a plurality of switching units.
[19]
The plurality of switching units are driven according to the potential of the lower battery cell and the potential of the corresponding battery cell to apply the potential of the corresponding battery cell to the BMS.
[20]
The connection controller allows the lowermost battery cell to be directly connected to the BMS, the uppermost battery cell to be connected to the BMS through one switch, and the battery cells between the lowermost and uppermost battery cells to be connected to the BMS through two switches. through the BMS.
[21]
The uppermost battery cell is connected to the BMS through a P-type FET, and battery cells between the lowermost and uppermost battery cells are connected to the BMS through a P-type FET and an N-type FET.
[22]
The P-type FETs of the battery cells between the lowermost battery cell and the uppermost battery cell are driven according to the potential of the lower battery cell and the potential of the battery cell to transfer the potential of the corresponding battery cell to the BMS, and the N-type FET is ground potential and is driven according to the potential of the corresponding battery cell to maintain the initial potential of the P-type FET of the upper battery cell.
[23]
A diode connected in parallel with the P-type FET and the N-type FET, respectively, may be further included.
[24]
Effects of the Invention
[25]
According to the present invention, a connection control unit may be provided between a connection terminal of a battery cell and an IC connection terminal of a BMS, and the battery cells may be sequentially connected to the BMS by the connection control unit. That is, the connection control unit may connect to the IC of the BMS sequentially from a battery cell having a low order to a battery cell having a high order, that is, from a low order to a high order. In addition, when certain battery cells are randomly connected without being connected in order, the corresponding battery cells may be connected to the BMS only when they are connected in order without being connected to the BMS.
[26]
Therefore, since it is not necessary to apply a solder eye, it is possible to prevent an increase in manufacturing cost. In addition, even when soldering is performed according to the order by the operator, it is possible to prevent occurrence of defects due to the operator's inexperience, that is, electrical damage to the IC of the BMS 200.
[27]
Brief description of the drawing
[28]
1 is a block diagram of a battery device according to an embodiment of the present invention;
[29]
2 is a partial circuit diagram of a battery device according to an embodiment of the present invention.
[30]
3 and 4 are schematic diagrams for explaining a driving method of a battery device according to an embodiment of the present invention.
[31]
Mode for Carrying Out the Invention
[32]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and the scope of the invention to those skilled in the art. It is provided for complete information.
[33]
1 is a block diagram for explaining the configuration of a battery device according to an embodiment of the present invention. 2 is a partial circuit diagram of a battery device according to an embodiment of the present invention, and is a circuit diagram for explaining a connection control unit constituting the battery device.
[34]
Referring to FIG. 1 , a battery device according to embodiments of the present invention includes a battery 100 including a plurality of battery cells 110 to 150, a BMS 200 managing the battery 100, and a BMS 200 ) and may include a connection control unit 300 that sequentially connects the battery cells 110 to 140 to the BMS 200.
[35]
1. Battery
[36]
The battery 100 is an electrical energy source for driving the power consuming device by providing energy to the power consuming device. Here, the power consuming device may include a mobile device such as a smart phone, an electric vehicle, a hybrid electric vehicle, and the like. The battery 100 may include at least one battery pack, each of the at least one battery pack may include a plurality of battery modules, and the battery module may include a plurality of battery cells capable of being charged and discharged. That is, the battery 100 may include a plurality of battery cells, a plurality of battery cells may be bundled in a predetermined unit to form a battery module, and a plurality of battery modules may form one battery pack. Also, although not shown, a plurality of battery cells constituting the battery 100 may be sequentially connected in one direction. That is, the plurality of battery cells 110 to 140 may be connected in one direction, for example, in a vertical direction, and first to nth battery cells may be sequentially connected from the bottom. Meanwhile,
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5,000 character limit. Use the arrows to translate more.The plurality of battery cells may be connected in series and/or parallel in various ways to meet the specifications of the power consuming device. Of course, a plurality of battery packs each including a plurality of battery cells 110 to 140 may also be connected in series and/or parallel. Here, the type of battery cell is not particularly limited, and may be, for example, a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, a nickel zinc battery, or the like.
[37]
2. BMS
[38]
The BMS 200 estimates the state of the battery 100 and manages the battery pack 100 using the estimated state information. For example, state information of the battery 100, such as SOC of the battery 100, state of health (SOH), maximum allowable input/output power, and output voltage, is estimated and managed. In addition, charging or discharging of the battery 100 is controlled using the state information. The BMS 200 according to the present invention includes a SOC estimating device for estimating the SOC of the battery 100 . In addition, the BMS 200 controls cell balancing to balance the state of charge of each battery cell. That is, a battery cell having a relatively high state of charge may be discharged and a battery cell having a relatively low state of charge may be charged. Meanwhile, in order to manage the battery 100 using the BMS 200, a sensing unit for sensing a state of the battery 100 may be further included. The sensing unit may include a current sensor for sensing current of the battery 100 , a voltage sensor for sensing voltage, and a temperature sensor for sensing temperature. At this time, at least one current sensor, voltage sensor, and temperature sensor may be provided. The BMS 200, which performs various functions, may be composed of various parts and mounted on a predetermined board. That is, a plurality of components for SOC estimation, a plurality of components for cell balancing, a plurality of components constituting the sensing unit, and other passive elements may be mounted on the substrate.
[39]
3. Access Control
[40]
The connection controller 300 sequentially connects the battery cells 110 to 140 to the BMS 200 . That is, the connection controller 300 sequentially connects the plurality of battery cells 110 to 140 to the BMS 200 one by one. To this end, the connection control unit 300 may be provided between the battery 100 and the BMS 200 and may be mounted on a substrate on which the BMS 200 is mounted. That is, the connection controller 300 may be provided on a substrate between the plurality of battery cells 110 to 150 and the IC of the BMS 200 . Accordingly, the connection control unit 300 may be a part of the BMS 200. Meanwhile, in FIG. 2 , VOO, V01, V02, and V03 are connection terminals of each battery cell 110 to 140, and VC00, VC01, VC02, and VC03 are IC connection terminals inside the BMS 200. That is, the connection controller 300 is provided between the connection terminals VOO, V01, V02, and V03 of each battery cell 110 to 140 and the IC connection terminals VC00, VC01, VC02, and VC03 of the BMS 200, respectively. The connection between the battery cells 110 to 140 and the IC of the BMS 200 is controlled.
[41]
The connection control unit 300 may include a plurality of switching units 310 to 330 to control the connection of each of the plurality of battery cells 110 to 140 with the BMS 200 . At this time, the lowermost battery cell 110 is directly connected to the BMS 200, that is, the IC, and the remaining battery cells 120 to 140 are connected to the BMS 200 through the switching units 310 to 330, respectively. can be connected Here, each of the plurality of switching units 310 to 330 may be switched according to a potential of a lower connection terminal and a potential of the corresponding connection terminal. That is, the first switching unit 310 is driven according to the voltage of the first battery cell 110 from the first connection terminal V00 and the voltage of the second battery cell 120 from the second connection terminal VO1. Thus, the voltage of the second connection terminal V01 can be transmitted to the second IC connection terminal VC01. In addition, the second switching unit 320 is driven according to the voltage of the second battery cell 120 from the second connection terminal V01 and the voltage of the third battery cell 130 from the third connection terminal VO2. Thus, the voltage of the third connection terminal V02 can be transmitted to the third IC connection terminal VC02. Also, the third switching unit 330 is driven according to the voltage of the third battery cell 130 from the third connection terminal V02 and the voltage of the fourth battery cell 140 from the fourth connection terminal VO3. Thus, the voltage of the fourth connection terminal V03 can be transmitted to the fourth IC connection terminal VC03.
[42]
The configuration of the connection controller 300 will be described in more detail as follows.
[43]
First, the lowermost battery cell 110 is directly connected to the IC of the BMS 200 . That is, the connection terminal V00 of the lowermost battery cell 110, that is, the first connection terminal V00 is directly connected to the first IC connection terminal VC00 of the BMS 200 without passing through a switching unit. In addition, the connection terminal V00 of the lowermost battery cell 110 maintains a ground potential.
[44]
3.1. 1st switching unit
[45]
The first switching unit 310 may be provided between the connection terminal V01 of the second battery cell 120, that is, between the second connection terminal V01 and the second IC connection terminal VC01 of the BMS 200. . The first switching unit 310 is driven according to the potential of the first connection terminal V00 and the potential of the second connection terminal V01, so that the potential of the second battery cell 120, that is, the second connection terminal V01 A potential may be transferred to the second IC connection terminal VC01 of the BMS 200 . Also, the first switching unit 310 may control the second switching unit 320 according to the potential of the second connection terminal V01. The first switching unit 310 may include a first switch 311 and a second switch 312 . That is, the first switch 311 is driven according to the potential of the first connection terminal V00 and the potential of the second connection terminal V01 to transfer the potential of the second connection terminal V01 to the second IC of the BMS 200. It is transmitted to the connection terminal (VC01). In addition, the second switch 312 is driven according to the potential of the second connection terminal V01 transmitted through the first switch 311 to control the initial driving of the second switching unit 320 . The first and second switches 311 and 312 of the first switching unit 310 will be described in detail as follows.
[46]
The first switch 311 may include a first FET 311a and a first diode 311b. The first FET 311a is driven according to the potential of the first connection terminal V00 and the second connection terminal V01 (ie, the voltage of the first battery cell 110 and the voltage of the second battery cell 120 are driven accordingly) to transfer the voltage of the second battery cell 120 . That is, the gate terminal of the first FET 311a may be connected to a connection point between the first connection terminal V00 and the second connection terminal V01, that is, the first node Q11. In this case, a first resistor R11 may be provided between the gate terminal of the first FET 311a and the second connection terminal VC01. Accordingly, the potential of the second connection terminal VC01 and the potential of the first connection terminal V00 may be applied to the gate terminal of the first FET 311a through the first resistor R11. This first FET 311a may be a P-type FET. The first FET 311a has a gate terminal connected to the first node Q11, a drain terminal connected to the second connection terminal V01, and a source terminal connected to the second FET 312a of the second switch 312 can be connected to the gate terminal of The first diode 311b is connected in parallel to the first FET 311a. In this case, the first diode 311b may be connected in a reverse direction to a current movement path from the second connection terminal V01 to the second IC connection terminal VC01. That is, the first diode 311b is a connection point between the source terminal of the first FET 311a and the gate terminal of the second FET 312a, that is, the third node Q13 and the second connection terminal V01, that is, the second A forward connection may be made between node Q12. The first diode 311b blocks the path from the second connection terminal V01 to the second IC connection terminal VC01 until the first FET 311a is turned on.
[47]
The second switch 312 may include a second FET 312a and a second diode 312b. The second FET 311a is driven according to the output terminal and the ground terminal of the first switch 311 so that the output of the first switch 311, that is, the voltage of the second battery cell 120 is connected to the second IC connection terminal VC01. ) is forwarded to That is, the gate terminal of the second FET 312a may be connected to a connection point between the source terminal of the first FET 311a and the ground terminal, that is, the third node Q13. In addition, the drain terminal of the second FET 312a is connected to the upper P-type FET, that is, the gate terminal of the first FET 321a of the first switch 321 of the second switching unit 320, and the source terminal is connected to the ground. can be connected to terminals. That is, the second FET 312a may be connected to the gate terminal of the third switch 321 transferring the potential of the third connection terminal V02 to the third IC connection terminal VC02. In this case, a second resistor R12 may be provided between the gate terminal and the ground terminal of the second FET 312a. Accordingly, the output potential of the first switch 311 may be applied to the ground potential and the gate terminal of the second FET 312a through the second resistor R12. This second FET 312a may be an N-type FET. The second FET 312a has a gate terminal connected to the third node Q13, a drain terminal connected to the gate terminal of the third switch 321, that is, a fifth node Q15, and a source terminal
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5,000 character limit. Use the arrows to translate more.It can be connected to the ground terminal. The second diode 312b is connected in parallel to the second FET 312a. In this case, the second diode 312b may be connected in a reverse direction to a current movement path from the second connection terminal V01 to the second IC connection terminal VC01. That is, the second diode 312b may be reversely connected between the drain terminal and the source terminal of the second FET 312a. The second diode 312b maintains the potential of the third FET 321a of the third switch until the second FET 312a is turned on.
[48]
3.2. 2nd switching unit
[49]
The second switching unit 320 may be provided between the connection terminal V02 of the third battery cell 130, that is, between the third connection terminal V02 and the third IC connection terminal VC02 of the BMS 200. . The second switching unit 320 is driven according to the potential of the second connection terminal V01 and the potential of the third connection terminal V02, and the potential of the third battery cell 130, that is, the third connection terminal V02. A potential may be transferred to the third IC connection terminal VC02 of the BMS 200 . Also, the second switching unit 320 may control the third switching unit 330 according to the potential of the third connection terminal V02. The second switching unit 320 may include a third switch 321 and a fourth switch 322 . That is, the third switch 321 is driven according to the potential of the second connection terminal V01 and the potential of the third connection terminal V02 so that the potential of the third connection terminal V02 is transferred to the third IC of the BMS 200. It is transmitted to the connection terminal (VC02). In addition, the fourth switch 322 is driven according to the potential of the third connection terminal V02 transmitted through the third switch 321 to control the initial driving of the third switching unit 330 . The third and fourth switches 321 and 322 of the second switching unit 320 will be described in more detail below.
[50]
The third switch 321 may include a third FET 321a and a third diode 321b. The third FET 321a is driven according to the potential of the second connection terminal V01 and the third connection terminal V02 (ie, the voltage of the second battery cell 120 and the voltage of the third battery cell 130 is driven according to) and transfers the voltage of the third battery cell 130 . That is, the gate terminal of the third FET 321a may be connected to a connection point between the drain terminal of the second FET 312a and the third resistor R13, that is, the fifth node Q15. In this case, a third resistor R13 may be provided between the gate terminal of the third FET 321a and the third connection terminal VC02. Accordingly, the potential of the third connection terminal VC02 and the potential of the second connection terminal V01 may be applied to the gate terminal of the third FET 321a through the third resistor R13. This third FET 321a may be a P-type FET. That is, the third FET 321a has a gate terminal connected to the fifth node Q15, a drain terminal connected to the third connection terminal V02, and a source terminal connected to the fourth FET of the fourth switch 322 ( It may be connected to the gate terminal of 322a). The third diode 321b is connected in parallel to the third FET 321a. In this case, the third diode 321b may be connected in a reverse direction to a current movement path from the third connection terminal V02 to the third IC connection terminal VC02. That is, the third diode 321b is a connection point between the source terminal of the third FET 321a and the gate terminal of the fourth FET 322a, that is, the seventh node Q17 and the third connection terminal V02, that is, the sixth There may be a forward connection between node Q16. The third diode 321b blocks the path from the third connection terminal V02 to the third IC connection terminal VC02 until the third FET 321a is turned on.
[51]
The fourth switch 322 may include a fourth FET 322a and a fourth diode 322b. The fourth FET 321a is driven according to the output terminal and the ground terminal of the third switch 321, so that the output of the third switch 321, that is, the voltage of the third battery cell 130 is connected to the third IC connection terminal VC02. ) is forwarded to That is, the gate terminal of the fourth FET 322a may be connected to a connection point between the source terminal of the third FET 321a and the ground terminal, that is, the seventh node Q17. In addition, the drain terminal of the fourth FET 322a is connected to the upper P-type FET, that is, the gate terminal of the fifth FET 331a of the fifth switch 331 of the third switching unit 330, and the source terminal is connected to the ground. can be connected to terminals. That is, the fourth FET 322a may be connected to the gate terminal of the fifth switch 331 transferring the potential of the fourth connection terminal V03 to the fourth IC connection terminal VC03. In this case, a fourth resistor R14 may be provided between the gate terminal and the ground terminal of the fourth FET 322a. Accordingly, the output potential of the third switch 321 may be applied to the ground potential and the gate terminal of the fourth FET 322a through the fourth resistor R14. This fourth FET 322a may be an N-type FET. That is, the fourth FET 322a has a gate terminal connected to the seventh node Q17, a drain terminal connected to the gate terminal of the fifth switch 331, that is, the ninth node Q19, and a source terminal connected to the ground. can be connected to terminals. The fourth diode 322b is connected in parallel to the fourth FET 322a. In this case, the fourth diode 322b may be connected in a reverse direction to a current movement path from the third connection terminal V02 to the third IC connection terminal VC02. That is, the fourth diode 322b may be reversely connected between the drain terminal and the source terminal of the fourth FET 322a. The fourth diode 322b maintains the potential of the fifth FET 331a of the fifth switch until the fourth FET 322a is turned on.
[52]
3.3. 3rd switching unit
[53]
The third switching unit 330 may be provided between the connection terminal V03 of the fourth battery cell 140, that is, between the fourth connection terminal V03 and the fourth IC connection terminal VC03 of the BMS 200. . The third switching unit 330 is driven according to the potential of the third connection terminal V02 and the potential of the fourth connection terminal V03, and the potential of the fourth battery cell 140, that is, the potential of the fourth connection terminal V03. A potential may be transmitted to the fourth IC connection terminal VC03 of the BMS 200 . This third switching unit 330 may include a fifth switch 331 . That is, the fifth switch 331 is driven according to the potential of the third connection terminal V02 and the potential of the fourth connection terminal V03 so as to set the potential of the fourth connection terminal V03 to the fourth IC of the BMS 200. It is transmitted to the connection terminal (VC03). The fifth switch 331 of the third switching unit 330 will be described in more detail as follows.

we claims

[Claim 1]
a plurality of battery cells; a BMS managing the plurality of battery cells; and a connection control unit for sequentially connecting the plurality of battery cells to the BMS, wherein the connection control unit connects the corresponding battery cell to the BMS according to a potential of a lower battery cell and a potential of the corresponding battery cell.
[Claim 2]
The battery device according to claim 1 , wherein the connection controller sequentially connects the BMS from the lowermost battery cell to the uppermost battery cell in one direction.
[Claim 3]
The battery device of claim 2 , wherein the connection control unit allows the battery cells to be connected to the BMS when the battery cells are sequentially connected without being connected to the BMS when the battery cells are randomly connected.
[Claim 4]
The battery device of claim 2 , wherein the connection controller is mounted on a substrate on which the BMS is mounted.
[Claim 5]
The battery device of claim 4 , wherein the connection controller is provided between a plurality of connection terminals respectively extending from the plurality of battery cells and an IC connection terminal of the BMS.
[Claim 6]
The battery device of claim 2 , wherein the connection control unit includes a plurality of switching units.
[Claim 7]
The battery device of claim 6 , wherein the plurality of switching units are driven according to a potential of a lower battery cell and a potential of the corresponding battery cell to apply the potential of the corresponding battery cell to the BMS.
[Claim 8]
The method according to claim 6, wherein the connection control unit allows the lowermost battery cell to be directly connected to the BMS, the uppermost battery cell to be connected to the BMS through one switch, and the battery cell between the lowermost battery cell and the uppermost battery cell A battery device that allows them to be connected to the BMS through two switches.
[Claim 9]
The battery device of claim 8 , wherein the uppermost battery cell is connected to the BMS through a P-type FET, and battery cells between the lowermost and uppermost battery cells are connected to the BMS through a P-type FET and an N-type FET.
[Claim 10]
The method according to claim 9, wherein the P-type FET of the battery cells between the lowermost battery cell and the uppermost battery cell is driven according to the potential of the lower battery cell and the potential of the battery cell to transfer the potential of the battery cell to the BMS, N A battery device in which the type FET is driven according to the ground potential and the potential of the corresponding battery cell to maintain the initial potential of the P-type FET of the upper battery cell.
[Claim 11]
The battery device of claim 10 , further comprising diodes connected in parallel with the P-type FET and the N-type FET, respectively.