JP2015089170A - Battery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a thermal chain reaction to neighboring battery cells even when a battery cell generates heat.SOLUTION: When temperature abnormality of a battery cell 4 (6) is detected, a neighboring battery cell 4 (5) and a battery cell 4 (7) are coupled to a discharge resistance 18 and are discharged. Thereby, even when heat of the battery cell 4 (6) is propagated to the battery cell 4 (5) and the battery cell 4 (7), temperature of the neighboring battery cell 4 (5) and the battery cell 4 (7) is prevented from being increased.

Description

  The present invention relates to a battery device including a plurality of battery cells.

  In order to reduce exhaust gas discharged to the environment, various types of hybrid electric vehicles that are driven by the output of at least one of the engine and motor, and electric vehicles that are driven by the output of the motor have been developed. Yes. Since the hybrid electric vehicle and the electric vehicle obtain power by driving a motor, a battery (battery cell) serving as a power source is mounted.

  In an electric vehicle, since it is necessary to mount many battery cells in a limited space, a plurality of battery cells are stacked and accommodated in a battery case to form a battery pack. Further, an arbitrary number of battery cells may be accommodated in a module case to form a battery module, and a plurality of battery modules may be accommodated in the battery case to constitute a battery pack.

  In a battery device having a battery cell, there is a possibility that a foreign substance is mixed into the battery cell to cause an internal short circuit, and a metal precipitation may occur in the battery cell to cause an internal short circuit. It is known that when an internal short circuit occurs in a battery cell, heat generation in the short circuit part, heat generation of the active substance, etc. may occur, and the higher the internal energy, that is, the higher the charging rate, the higher the temperature of the heat generation. Yes.

  For this reason, a battery device has been conventionally proposed in which a material of an active substance of an electrode that occludes and releases charge carriers is appropriately selected so that rapid heat generation can be quickly suppressed (for example, Patent Document 1). Conventionally proposed techniques can suppress rapid heat generation by reducing the short-circuit current by increasing the potential drop rate when an internal short circuit occurs by selecting a material.

  However, when an internal short circuit occurs, it is impossible to suppress the generation of heat, and the fact is that it has an influence of heat on the adjacent battery cells. For this reason, when an internal short circuit arises in a battery cell, heat | fever will propagate to an adjacent battery cell and there exists a possibility that an adjacent battery cell may generate heat | fever depending on the charging condition of a battery cell. For this reason, the present condition is that the technique which suppresses the chain of the heat | fever with respect to the adjacent battery cell is desired.

JP 2011-108505 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery device that can eliminate the chain of heat to adjacent battery cells even if the battery cells generate heat.

  In order to achieve the above object, a battery device according to a first aspect of the present invention includes a plurality of electrically connected battery cells, temperature detecting means for detecting the temperature of each of the battery cells, and the batteries. A load member that is selectively connected to a cell; a connection / disconnection means that switches an electrical connection / disconnection state between the selected battery cell and the load member; and a temperature that is higher than a predetermined temperature by the temperature detection means. Is detected, the connecting / disconnecting means is connected and operated so as to discharge the adjacent battery cell adjacent to the high-temperature battery cell, which is the battery cell that has become higher than the predetermined temperature. And a control means for forming.

  In the present invention according to claim 1, when a battery cell having a temperature higher than a predetermined temperature is detected by the temperature detecting means, the connecting / disconnecting means of the adjacent battery cell adjacent to the high-temperature battery cell having a high temperature is connected. Operate and discharge adjacent battery cells connected to a load member. In order to reduce the internal energy by discharging the adjacent battery cell, even when the temperature of the high temperature battery cell is transmitted, the exothermic temperature of the adjacent battery cell is low.

  For this reason, even if a battery cell heat | fever-generates, it becomes possible to eliminate the chain of heat to the adjacent battery cell.

  Incidentally, Japanese Patent Application No. 2002-141112 discloses a technique for discharging an internal battery by connecting it to a load circuit when the external surface temperature of the battery storage means (battery case) or the internal ambient temperature becomes high. It is disclosed. This technique is a technique for preventing an internal short circuit of the battery from heat outside the battery case, and there is no idea to prevent the chain of heat by discharging the adjacent battery cell when the battery cell is short-circuited. For this reason, this is a technology that is completely different from the present invention.

  And the battery device of this invention which concerns on Claim 2 comprises the battery module by the said battery cell in the battery device of Claim 1, The said control means contains the said adjacent battery cell, The said battery module The connecting / disconnecting means is connected to form an electrical connection state so as to discharge the battery.

  In the present invention according to claim 2, since the connection / disconnection means of the battery module in which the adjacent battery cell is accommodated is operated in the connected state, the battery module in which the adjacent battery cell exists can be connected to the load member and discharged. The chain of heat to surrounding battery cells including adjacent battery cells can be eliminated.

  The battery device of the present invention according to claim 3 is the battery device according to claim 1 or 2, wherein the control means places the connecting / disconnecting means for the adjacent battery cells in a connected state. In this case, the negative electrode side adjacent battery cell adjacent to the negative electrode side of the high temperature battery cell is discharged after the positive electrode side adjacent battery cell adjacent to the positive electrode side on the circuit.

  In this invention which concerns on Claim 3, since the adjacent battery cell adjacent to the positive electrode side of a high temperature battery cell is discharged first, discharge of the adjacent battery cell adjacent to the positive electrode side with low melting | fusing point and high possibility of causing heat damage is carried out. Can be prioritized.

  The battery device of the present invention according to claim 4 is the battery device according to any one of claims 1 to 3, wherein the amount of electricity stored in each of the battery cells is equally controlled. An equal resistance is provided, and a resistance value of the load member is higher than a resistance value of the equal resistance.

  In the present invention according to claim 4, since the resistance value of the load member is higher than the resistance value of the uniform resistance, the discharge power can be increased, and earlier discharge is possible.

  The battery device of the present invention according to claim 5 is the battery device according to any one of claims 1 to 4, wherein each of the battery cells is connected to an in-vehicle device via an opening / closing device, The control means, when a temperature higher than the predetermined temperature is detected by the temperature detection means, after operating the switchgear to cut off the electrical connection between the battery cells and the in-vehicle device, The connection / disconnection means is connected to discharge the adjacent battery cells.

  In the present invention according to claim 5, when a temperature higher than a predetermined temperature is detected and a high temperature battery cell is detected, the adjacent battery cell is discharged after operating the switchgear to shut off the in-vehicle device. Therefore, the in-vehicle device can be reliably protected.

  In order to achieve the above object, a battery device of the present invention according to claim 6 detects a plurality of battery modules constituted by a plurality of electrically connected battery cells and the temperatures of the respective battery modules. A temperature detecting means; a load member selectively connected to each of the battery modules; a connecting / disconnecting means for switching an electrical connecting / disconnecting state between the selected battery module and the load member; and the temperature detecting means. When the temperature higher than the predetermined temperature is detected by the electrical connection, the connecting / disconnecting means is connected and operated so as to discharge the battery module adjacent to the battery module higher than the predetermined temperature. And a control means for forming a state.

  In this invention which concerns on Claim 6, when the battery module (battery module in which the battery cell which became high temperature exists) by which the temperature detection means became higher than predetermined temperature is detected, the battery module which became high temperature The battery module adjacent to is connected to a load member to discharge. In order to reduce the internal energy by discharging the adjacent battery module, the heat generation temperature of the adjacent battery module is low even when the temperature of the battery module containing the battery cell that has become high temperature is transmitted. .

  For this reason, even if a battery cell heat | fever-generates, it becomes possible to eliminate the chain | strand of the heat | fever to the battery cell (battery module) with which the battery module in which the heat | fevered battery cell was accommodated is adjacent.

  Even if the battery cell generates heat, the battery device of the present invention can eliminate the heat chain to the adjacent battery cell.

1 is an external view of an electric vehicle including a battery device according to an embodiment of the present invention. It is a disassembled perspective view of a battery pack. It is a circuit system diagram of a battery device. It is a related figure of the exothermic temperature of a battery cell, and internal energy. It is a circuit system diagram of the battery apparatus which concerns on another Example. It is a circuit system diagram of the battery apparatus which concerns on another Example.

  A battery device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view showing the appearance of an electric vehicle equipped with a battery device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a battery pack, and FIG. 3 conceptually shows a circuit system of the battery device. FIG. 4 shows the relationship between the heat generation temperature and the internal energy when the battery cell is internally short-circuited.

  As shown in FIG. 1, a battery pack 2 is attached to a frame (not shown) of an electric vehicle 1 as a vehicle. The battery pack 2 is configured by fixing a large number of battery cells as batteries inside a battery case 3. As shown in FIG. 2, a large number of battery cells 4 are connected and accommodated inside the battery case 3, and a high voltage that serves as a power source for driving and driving is connected to the large number of battery cells 4. A circuit is formed.

  In the battery device constituted by the battery pack 2 described above, it is assumed that heat is generated in the battery cell 4 due to an internal short circuit or the like, and the battery cell 4 (adjacent to the battery cell 4 (high temperature battery cell) that is expected to generate heat) ( The adjacent energy cells are discharged to reduce the internal energy. Thereby, even if the heat of a high temperature battery cell is transmitted to the adjacent battery cell 4, the heat_generation | fever temperature of an adjacent battery cell is suppressed and the chain of heat can be eliminated.

  A first embodiment of the circuit configuration of the battery device will be described with reference to FIG. The circuit configuration shown in FIG. 3 shows a situation where, for example, eight battery cells 4 are connected in series and eight battery cells 4 are arranged in a line.

  As shown in the figure, the battery cells 4 (1) to the battery cells 4 (8) are arranged connected in series, and the positive and negative electrodes of the adjacent battery cells 4 are connected. The positive side of the battery cell 4 (1) and the negative side of the battery cell 4 (8) are connected to an inverter 13 (on-vehicle equipment) that controls the driving motor and the driving motor via contactors 11 and 12 as switching devices. It is connected.

  Each of the battery cells 4 (1) to 4 (8) is provided with a temperature sensor 15 as temperature detecting means, and the temperature sensor 15 detects the temperature of each battery cell 4. The detection information of the temperature sensor 15 is input to the control means 16, and when the temperature higher than the predetermined temperature is detected, the control means 16 determines that an internal short circuit has occurred due to overheating of the corresponding battery cell 4. The

  A discharge resistor 18 is connected as a load member from the battery cell 4 (1) to the battery cell 4 (8). That is, the positive electrode side of the battery cells 4 (1), (3), (5), and (7) and the negative electrode side of the battery cell 4 (8) are connected to the discharge resistor 18 by the first line 21. The positive side of the battery cells 4 (2), (4), (6), and (8) is connected to the discharge resistor 18 by the second line 22.

  Relays 25 (1) (3) serving as connecting / disconnecting means are respectively connected to the first lines 21 on the positive side of the battery cells 4 (1) (3) (5) (7) and on the negative side of the battery cell 4 (8). ) (5) (7) (8). And the relay 26 (2) (4) (6) (8) as a connection / disconnection means is respectively provided in the 2nd line 22 by the side of the positive electrode of battery cell 4 (2) (4) (6) (8). Is provided.

  The battery device is provided with an equal resistance (not shown) that uniformly controls the power emitted from each of the plurality of battery cells 4. The discharge resistor 18 is configured with a resistance value higher than the resistance value of the uniform resistance. For this reason, discharge electric power can be made high, and earlier discharge becomes possible at the time of discharge mentioned below.

  The relays 25 and 26 are always in a disconnected state. The relays 25 and 26 are selectively connected individually based on the operation signal from the control means 16, and any battery cell 4 is connected to the discharge resistor 18. For example, when the relay 25 (5) and the relay 26 (6) are connected, the battery cell 4 (5) is connected to the discharge resistor 18, and only the battery cell 4 (5) is discharged, thereby reducing the internal energy. .

  The operation of the battery device described above will be described with reference to FIGS.

  The operation of discharging the battery cell 4 (adjacent battery cell) adjacent to the high-temperature battery cell when assuming that an internal short circuit has occurred in an arbitrary battery cell 4 (high-temperature battery cell) will be described. For example, the operation when it is assumed that the battery cell 4 (6) is overheated for some reason will be described.

  When the detected value of the temperature sensor 15 of the battery cell 4 (6) exceeds a predetermined temperature, the control means 16 determines that an internal short circuit has occurred in the battery cell 4 (6). When it is determined that an internal short circuit has occurred in the battery cell 4 (6), the contactors 11 and 12 are opened to cut off the supply of power to the inverter 13 and to isolate the power supply from external devices. For example, in the case of an electric vehicle, traveling is stopped.

  In the present embodiment, the inverter 13 is cited as an in-vehicle device. However, the present invention is not limited to this, and the power supply to devices connected to a battery device such as a drive motor or an air conditioner is cut off. You can protect the connected equipment.

  Then, the battery cell 4 (5) and the battery cell 4 (7) adjacent to the battery cell 4 (6) are discharged to reduce the internal energy, and the heat to the battery cell 4 (5) and the battery cell 4 (7). Eliminate the chain.

  That is, the relay 25 (5) and the relay 26 (6) are connected by the signal from the control means 16, and the relay 25 (7) and the relay 26 (8) are connected. As a result, the battery cell 4 (5) and the battery cell 4 (7) are connected to the discharge resistor 18 to form a closed circuit and are discharged, and the internal resistance of the battery cell 4 (5) and the battery cell 4 (7) is reduced. descend.

  As shown in FIG. 4, the temperature (T) at which the battery cell 4 generates heat by something (for example, due to an internal short circuit) increases according to the internal energy E (charge ratio). For example, when the temperature (T1) is exceeded (when the internal energy E1 is exceeded), there is a risk of heat generation and smoke generation in the battery cell 4. For this reason, by discharging the battery cell 4 (5) and the battery cell 4 (7) to reduce the internal energy, the heat generation temperature can be lowered to a temperature at which there is no fear of heat generation and smoke generation.

  For example, by connecting the battery cell 4 (5) and the battery cell 4 (7) to the discharge resistor 18 and setting the internal energy to zero, even if the heat of the battery cell 4 (6) propagates, the battery cell 4 ( 5) and the battery cell 4 (7) do not generate heat, and the chain of heat can be eliminated. Thereby, even if the battery cell 4 (6) generates heat, the influence of heat on the adjacent battery cell 4 can be eliminated, and the occurrence of ignition or the like can be eliminated.

  When the internal energy exceeds (E1), the temperature of the heat generation exceeds (T1). Therefore, the discharge of the battery cell 4 (5) and the battery cell 4 (7) for eliminating the heat chain is at least internal energy. May be carried out until (E1) or less.

  When discharging the battery cell 4 (5) and the battery cell 4 (7), since the positive electrode side of the battery cell 4 (6) is connected to the battery cell 4 (5), the battery cell 4 (5) is discharged. It is preferable to start. The terminal on the positive electrode side has a high temperature because, for example, a copper terminal having a low melting point is used. For this reason, it is possible to more reliably eliminate the heat chain by starting the discharge from the battery cell 4 (5) adjacent to the higher temperature side.

  For this reason, when the temperature abnormality of the battery cell 4 (6) is detected, the adjacent battery cell 4 (5) and the battery cell 4 (7) are discharged, so that the heat of the battery cell 4 (6) is increased. Even if it propagates to the battery cell 4 (5) and the battery cell 4 (7), the temperature of the adjacent battery cell 4 (5) and the battery cell 4 (7) does not increase. Therefore, the influence (heat influence) of the heat generating battery cell is not chained to the adjacent battery cell, and the heat generation and smoke generation of the adjacent battery cell can be eliminated.

  Therefore, even if the battery cell 4 generates heat, it is possible to eliminate the heat chain to the adjacent battery cell 4 on the circuit. Moreover, since the adjacent battery cell 4 is discharged preferentially compared with the case where all the battery cells 4 are discharged, the chain of heat can be eliminated at an early stage.

  A second embodiment of the circuit configuration of the battery device will be described with reference to FIG. The circuit configuration shown in FIG. 5 shows a situation in which, for example, four battery cells 4 are connected in series, and the four battery cells 4 are arranged in two rows. The same members as those shown in FIG.

  As shown in the figure, battery cells 4 (1) to battery cells 4 (4) are connected in series, and the positive and negative electrodes of adjacent battery cells 4 are connected. Further, the battery cells 4 (5) to the battery cells 4 (8) are arranged in series and connected to each other, and the positive and negative electrodes of the adjacent battery cells 4 are connected. And the positive electrode and negative electrode of battery cell 4 (4) and battery cell 4 (5) are connected, battery cell 4 (1) (8), battery cell 4 (2) (7), battery cell 4 (3) ( 6) Battery cells 4 (4) and (5) are arranged adjacent to each other.

  And the positive electrode side of battery cell 4 (1) and the negative electrode side of battery cell 4 (8) are connected to inverter 13 (vehicle equipment) via contactors 11 and 12 as switching devices.

  Similarly to the first embodiment, each of the battery cells 4 (1) to 4 (8) is provided with a temperature sensor 15 as temperature detection means, and detection information of the temperature sensor 15 is input to the control means 16. Is done. The positive electrode side of the battery cells 4 (1) (3) (5) (7) and the negative electrode side of the battery cell 4 (8) are connected to the discharge resistor 18 by the first line 21, and the battery cells 4 (2) (4) (6) The positive electrode side of (8) is connected to the discharge resistor 18 by the second line 22.

  Relays 25 (1) (3) serving as connecting / disconnecting means are respectively connected to the first lines 21 on the positive side of the battery cells 4 (1) (3) (5) (7) and on the negative side of the battery cell 4 (8). ) (5) (7) (8) are provided, and the second line 22 on the positive side of the battery cell 4 (2) (4) (6) (8) is connected to a relay 26 ( 2) (4) (6) (8) are provided.

  For example, when it is assumed that the battery cell 4 (2) is overheated for some reason, the contactors 11 and 12 are closed and the battery cell 4 (1) and the battery cell 4 (1) adjacent to the battery cell 4 (2) on the circuit are connected. The battery cell 4 (3) and the battery cell 4 (7) adjacent to the battery cell 4 (2) in terms of arrangement are discharged to reduce the internal energy, and the battery cell 4 (1) (3) and the battery cell Eliminate the heat chain to 4 (7).

  That is, the relay 25 (1) and the relay 26 (2), the relay 25 (3) and the relay 26 (4) are connected by the signal from the control means 16, and the adjacent battery cell 4 (1) and Battery cell 4 (3) is connected to discharge resistor 18. At the same time, the relay 25 (7) and the relay 26 (8) are connected, and the battery cell 4 (7) adjacent in the arrangement is connected to the discharge resistor 18. Thereby, the internal resistance of the battery cell 4 (1) and the battery cell 4 (3) adjacent on the circuit and the battery cell 4 (7) adjacent on the arrangement is lowered.

  For this reason, when the temperature abnormality of the battery cell 4 (2) is detected, the adjacent battery cell 4 (1), the battery cell 4 (3), and the battery cell 4 (7) are discharged. Even if the heat of 4 (2) propagates to the battery cell 4 (1), the battery cell 4 (3), and the battery cell 4 (7) that are adjacent on the circuit and in the arrangement, the adjacent battery cell 4 (1 ) (3) The temperature of (7) does not increase. Therefore, the influence (heat influence) of the heat generating battery cell is not chained to the adjacent battery cell, and the heat generation and smoke generation of the adjacent battery cell can be eliminated.

  Therefore, even if the battery cell 4 generates heat, it is possible to eliminate the heat chain to the adjacent battery cell 4 on the circuit and in the arrangement.

  In addition, the battery cell 4 of the heat generation object of the first embodiment and the second embodiment described above is an example, and when the high temperature state of the battery cell 4 is detected, the adjacent battery cell 4 on the circuit and arrangement. Is discharged. In the above-described embodiments, the battery cell 4 is connected to form a battery pack. However, a plurality of battery cells 4 are housed in a module case to form a battery module. It is also possible to use a battery pack including the battery module.

  A third embodiment of the circuit configuration of the battery device will be described with reference to FIG. The circuit configuration shown in FIG. 6 shows a situation where, for example, four battery cells 4 are accommodated in a module case to form one battery module, and four battery modules are arranged in parallel. The same members as those shown in FIGS. 3 and 5 are denoted by the same reference numerals.

  As shown in the figure, four battery cells 4 are accommodated in a module case 31 to form a battery module 32. Four battery modules 32 (1) to 32 (4) are arranged in parallel, and the positive and negative electrodes of adjacent battery modules 32 are connected. And the positive electrode side of battery module 32 (1) and the negative electrode side of battery module 32 (4) are connected to inverter 13 (vehicle equipment) via contactors 11 and 12.

  Each of the battery modules 32 (1) to 32 (4) is provided with a temperature sensor 33 as temperature detecting means, and the temperature sensor 33 detects the temperature of each battery module 32. The detection information of the temperature sensor 33 is input to the control unit 16, and when the control unit 16 detects a temperature higher than a predetermined temperature, the internal battery cell 4 is internally connected to any of the internal battery cells 4 due to overheating of the corresponding battery module 32. It is determined that a short circuit has occurred.

  A discharge resistor 18 is connected from the battery module 32 (1) to the battery module 32 (4). That is, the positive side of the battery module 32 (1) (3) and the negative side of the battery module 32 (4) are connected to the discharge resistor 18 by the first line 29. The positive side of the battery modules 32 (2) and (4) is connected to the discharge resistor 18 by the second line 30.

  Relays 35 (1), (3), and (4) as connection / disconnection means are provided on the first line 29 on the positive side of the battery modules 32 (1) and (3) and on the negative side of the battery module 32 (4), respectively. In addition, relays 36 (2) (4) serving as connection / disconnection means are provided on the second lines 30 on the positive electrode side of the battery modules 32 (2) (4), respectively.

  The relays 35 and 36 are always in a disconnected state. The relays 35 and 36 are selectively connected individually based on the operation signal from the control means 16, and the arbitrary battery module 32 is connected to the discharge resistor 18. For example, when the relay 35 (1) and the relay 36 (2) are connected, the battery module 32 (1) is connected to the discharge resistor 18, and only the battery cell 4 accommodated in the battery module 32 (1) is discharged. The internal energy is reduced.

  An operation for discharging the battery module 32 adjacent to the battery module 32 in which the battery cell 4 is accommodated when it is assumed that an internal short circuit has occurred in an arbitrary battery cell 4 will be described. For example, the operation when it is assumed that the battery cell 4 accommodated in the battery module 32 (1) is overheated for some reason will be described.

  When the detected value of the temperature sensor 33 of the battery module 32 (1) exceeds a predetermined temperature, the control means 16 determines that an internal short circuit has occurred in the battery cell 4 accommodated in the battery module 32 (1). When it is determined that an internal short circuit has occurred in the battery cell 4 accommodated in the battery module 32 (1), the contactors 11 and 12 are closed to cut off the power supply to the inverter 13, To isolate the power supply.

  And the battery cell 4 accommodated in the battery module 32 (2) adjacent to the battery module 32 (1) is discharged to reduce the internal energy, and the battery module 32 (2) (battery module 32 (2) is accommodated. Eliminates heat chain to the battery cell 4).

  That is, the relay 35 (3) and the relay 36 (2) are connected by a signal from the control means 16, and the battery module 32 (2) (the battery cell 4 accommodated in the battery module 32 (2)) is discharged. 18 and the internal resistance of the battery module 32 (2) decreases.

  For this reason, when the temperature abnormality of the battery module 32 (1) is detected, the adjacent battery module 32 (2) (the battery cell 4 accommodated in the battery module 32 (2)) is discharged. Even if the heat of the module 32 (1) propagates to the adjacent battery module 32 (2), the temperature of the adjacent battery module 32 does not increase.

  Therefore, the influence (heat influence) of the battery module 32 that has generated heat is not chained to the adjacent battery module 32, and the heat generation and smoke generation of the battery cells 4 of the adjacent battery module 32 can be eliminated. Since the heat of the battery module 32 is detected, heat generation and smoke generation of the battery cell 4 can be eliminated by a small number of temperature detection means.

  Thereby, even if the battery cell 4 generates heat, it is possible to eliminate the chain of heat to the battery cell 4 (battery module 32) adjacent to the battery module 32 in which the generated battery cell 4 is accommodated. become.

  When a temperature abnormality of the battery module 32 (2) is detected, the battery cell 4 of the adjacent battery module 32 (1) (3) is discharged, and a temperature abnormality of the battery module 32 (3) is detected. In this case, the battery cells 4 of the adjacent battery modules 32 (2) and (4) are discharged. Furthermore, when the temperature abnormality of the battery module 32 (4) is detected, the battery cell 4 of the adjacent battery module 32 (3) is discharged.

  The present invention can be used in the industrial field of battery devices including a plurality of battery cells.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Battery pack 3 Battery case 4 Battery cell 11, 12 Contactor 13 Inverter 15, 33 Temperature sensor 16 Control means 18 Discharge electrode 21, 29 1st line 22, 30 2nd line 25, 35 Relay 26, 36 Relay 31 Module case 32 Battery module

Claims (6)

A plurality of electrically connected battery cells;
Temperature detecting means for detecting the temperature of each battery cell;
A load member selectively connected to each of the battery cells;
Connection / disconnection means for switching an electric connection / disconnection state between the selected battery cell and the load member,
When the temperature detecting means detects a temperature higher than a predetermined temperature, the connection / disconnection is performed so that adjacent battery cells adjacent to the high-temperature battery cell that is the battery cell higher than the predetermined temperature are discharged. And a control means for forming an electrical connection state by connecting the means. The battery device according to claim 1,
A battery module is constituted by a plurality of the battery cells,
The control means includes
The battery device is characterized in that an electrical connection state is formed by connecting and connecting the connecting and disconnecting means so as to discharge the battery module including the adjacent battery cells. The battery device according to claim 1 or 2,
The control means includes
When the connecting / disconnecting means for the adjacent battery cell is connected, the negative electrode side adjacent battery cell adjacent to the negative electrode side of the high temperature battery cell is discharged after the positive electrode side adjacent battery cell adjacent to the positive electrode side on the circuit. A battery device. The battery device according to any one of claims 1 to 3,
Equivalent resistance for uniformly controlling the amount of electricity stored in each battery cell is provided,
The battery device according to claim 1, wherein a resistance value of the load member is higher than a resistance value of the uniform resistance. In the battery device according to any one of claims 1 to 4,
Each of the battery cells is connected to an in-vehicle device via a switching device,
The control means includes
When a temperature higher than the predetermined temperature is detected by the temperature detection means, after operating the switchgear to cut off the electrical connection between each battery cell and the in-vehicle device, the adjacent battery cell The battery device is characterized in that the connection / disconnection means is connected so as to be discharged. A plurality of battery modules configured by a plurality of electrically connected battery cells;
Temperature detecting means for detecting the temperature of each of the battery modules;
A load member selectively connected to each of the battery modules;
Connection / disconnection means for switching an electric connection / disconnection state between the selected battery module and the load member;
When the temperature detecting means detects a temperature higher than the predetermined temperature, the connecting / disconnecting means is connected and operated so as to discharge the battery module adjacent to the battery module that has become higher than the predetermined temperature. And a control means for forming an electrical connection state.

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