JP2015012649A - Abnormality detection device in battery pack with voltage equalization circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a function for stopping an abnormal voltage equalization circuit by accurately detecting an abnormal current or an abnormal voltage of each battery cell in the voltage equalization circuit where a large current based on active cell balance flows between battery cells, without increasing an area of a circuit board.SOLUTION: An abnormality detection device comprises current detection means DA-DM and a microcontroller 121. With respect to respective battery cells of a battery module 40, the current detection means DA-DM detect levels of currents flowing in a voltage equalization circuit for equalizing voltages of the battery cells and send the levels of the currents to the microcontroller 121. The microcontroller 121 sends a stop signal for stopping operation of the voltage equalization circuit to a gate signal generation part (analog IC) which generates a gate signal for controlling ON/OFF of the voltage equalization circuit when abnormality is detected by comparing the levels of the currents sent from the current detection means DA-DM and voltage information inputted from a battery monitoring electronic control unit 20 for monitoring the voltages of the battery cells with predetermined thresholds.

Description

  The present invention relates to an abnormality detection device in a battery pack including a voltage equalization circuit that equalizes voltages of a plurality of battery cells connected in series.

  Battery modules that obtain a high voltage output by connecting a plurality of rechargeable battery cells in series have been put into practical use. This type of battery module is mounted on, for example, an industrial vehicle such as a forklift, an electric vehicle, or a hybrid vehicle. When charging is performed in a state where a large number of battery cells are connected in series, the voltage (remaining battery capacity) of each battery cell may become uneven.

  In addition, when the battery module is mounted on an electric vehicle or the like, the discharge at the time of driving the motor and the charging by the regenerative current at the time of deceleration are repeated, and the voltage of each battery cell becomes non-uniform by repeating this charge and discharge. May be. And the non-uniform | heterogenous voltage of a battery cell may accelerate | stimulate deterioration of a part of battery cell, and causes the efficiency fall as the whole battery module. The non-uniformity of the voltage of the battery cell is caused by a variation in manufacturing each battery cell, a variation in aging deterioration, or the like. For this reason, the technique which equalizes the voltage between several battery cells is requested | required.

  As a technology to equalize the voltage between multiple battery cells, the active cell balance that equalizes the voltage of both battery cells by passing current from a battery cell having a high voltage to a battery cell having a low voltage between adjacent battery cells There is known a voltage equalization circuit referred to as FIG. 4 shows a basic configuration example of a voltage equalization circuit that performs active cell balancing.

  In FIG. 4, Ce1 and Ce2 are adjacent battery cells, L is an inductor, HSw and LSw are switch elements, and HDi and LDi are body diodes of the switch elements HSw and LSw. As shown in FIG. 4, switch elements HSw and Lsw are connected in parallel to the battery cells Ce1 and Ce2 with respect to the battery cells Ce1 and Ce2 of the same capacity connected in series. Then, one end of the inductor L is connected to the connection point of the battery cells Ce1 and Ce2, and the other end of the inductor L is connected to the connection point of the switch elements HSw and LSW.

  In such a voltage equalization circuit, when the voltage of the battery cell Ce1 is higher than the voltage of the battery cell Ce2, the gate signal HG for turning on the switch element HSw is given, and the gate signal LG for turning off the switch element LSW is given. Then, a closed loop current path of the battery cell Ce1 → switching element HSw → inductor L → battery cell Ce1 is formed, and electric energy is transferred from the battery cell Ce1 to the inductor L.

  Thereafter, when the switch element HSw is turned off and the switch element LSw is turned on, a closed loop current path of inductor L → battery cell Ce2 → switch element LSW → inductor L is formed, and the electric energy transferred to the inductor L Transition to Ce2. By such an operation, the charge is transferred from the battery cell Ce1 to the battery cell Ce2, and the voltage of the battery cell Ce1 and the voltage of the battery cell Ce2 are equalized.

  On the other hand, when the voltage of the battery cell Ce2 is higher than the voltage of the battery cell Ce1, a gate signal LG for turning on the switch element LSW is given, and a gate signal HG for turning off the switch element HSw is given. Then, a closed loop current path of battery cell Ce2 → inductor L → switch element LSW → battery cell Ce2 is formed, and electric energy is transferred from battery cell Ce2 to inductor L.

  Thereafter, when the switch element LSW is turned off and the switch element HSw is turned on, a closed loop current path of inductor L → switch element HSw → battery cell Ce1 → inductor L is formed, and the electric energy transferred to the inductor L Move to Ce1. By such an operation, the charge is transferred from the battery cell Ce2 to the battery cell Ce1, and the voltage of the battery cell Ce1 and the voltage of the battery cell Ce2 are equalized.

  In addition to the above-mentioned active cell balance, as a technique for equalizing the voltage between the battery cells connected in series, a discharge circuit by a resistor is provided in parallel with each battery cell, and the discharge circuit is provided for a high voltage battery cell. There is known a technique called passive cell balance that discharges electric charges to equalize the voltage of each battery cell.

  Since passive cell balance involves heat dissipation due to resistance, a very large current is not allowed to flow, and discharge is performed at a current of about 100 mA, for example. On the other hand, in the active cell balance, since heat is not released by resistance, charging / discharging is performed with a large current, for example, about 4 A, compared to the passive cell balance.

  If the secondary battery falls into an overdischarge state or an excessive discharge current flows, the battery performance deteriorates and the battery life is remarkably reduced. Thus, for example, Patent Document 1 proposes a battery power supply device such as a battery pack in which an overdischarge prevention circuit and an overcurrent prevention circuit are provided and integrated with a secondary battery.

  In addition, in a voltage equalization circuit that performs passive cell balancing, a battery module management device that detects disconnection of a connection line of a battery module in which a plurality of battery cells are connected in series, and detects overcharge / discharge, for example, Patent Document 2 and the like.

JP 2001-95158 A JP 2006-149068 A

  When the secondary battery is overdischarged or overcharged, or an excessive charge / discharge current flows, the battery performance deteriorates and the battery life is reduced. For this reason, the battery module is constantly monitored for abnormalities that cause excessive charging / discharging current to flow through each battery cell, or each battery cell is overdischarged or overcharged. There is a demand for a configuration that can minimize the adverse effects caused by the occurrence and can appropriately deal with the abnormality immediately.

  Therefore, in order to constantly monitor the overcurrent / undercurrent and overcharge (overvoltage) / overdischarge (undervoltage) of each battery cell and detect those abnormalities, abnormal current and abnormal voltage are detected for each voltage equalization circuit. It is conceivable that a hardware circuit realizes a function of detecting the voltage and stopping the voltage equalization circuit when the abnormality is detected.

  A configuration example in which this function is realized by a hardware circuit is shown in FIG. As shown in FIG. 5, the voltage equalization unit 10 includes a power unit 11, a digital control unit 12, and an analog control unit 13. The power unit 11 includes, for example, 13 voltage equalization circuits that equalize the voltage in each two adjacent battery cell pairs of the battery module 40 with respect to the battery module 40 including 14 battery cells.

  As described with reference to FIG. 4, each voltage equalization circuit includes two switch elements and an inductor L, and gate signals HG and LG are added to the two switch elements, respectively. By turning on / off, the charge is transferred between two adjacent battery cell pairs via the inductor L to equalize the voltage. In FIG. 5, suffixes A to M are attached to the elements such as the gate signals HG and LG and the inductor L in the 13 voltage equalizing circuits, corresponding to the respective voltage equalizing circuits.

  The voltage of each battery cell is input to the battery monitoring IC 21 of the battery monitoring electronic control unit (ECU) 20, converted into a digital signal by the analog-digital converter 211, and from the battery monitoring microcontroller 22 in the voltage equalization unit 10. It is sent as voltage information to the voltage equalization microcontroller 121 of the digital control unit 12.

  The voltage equalization microcontroller 121 receives control signals C1A, C2A to C1M, C2M for controlling on / off of the two switch elements of each voltage equalization circuit based on the voltage information of each battery cell. It is sent to each analog IC corresponding to each voltage equalization circuit. Each analog IC serves as a gate signal generation unit that generates gate signals HGA, LGA to HGM, and LGM that turn on / off the two switch elements of each voltage equalization circuit in accordance with the control signals C1A, C2A to C1M, and C2M. Function.

  Each voltage equalization circuit includes current detection units DA to DM that detect currents flowing through the respective voltage equalization circuits, and the current levels detected by the current detection units DA to DM are determined according to an abnormality corresponding to each voltage equalization circuit. The data is sent to the detection / stop circuits 122A to 122M. The abnormality detection / stop circuits 122A to 122M receive the detection signals (current levels) of the current detection units DA to DM and the voltage of each battery cell output from the battery monitoring IC 21 of the battery monitoring electronic control unit (ECU) 20. To do.

  The abnormality detection / stop circuits 122A to 122M monitor abnormal overcurrent / undercurrent and abnormal overvoltage / undervoltage based on the values of the current and voltage, and an abnormal current or voltage is detected. Stop signals (sleep signals) SA to SM for stopping the operation of the voltage equalization circuit are transmitted.

  The stop signals SA to SM are applied to analog ICs (gate signal generation units) corresponding to the voltage equalization circuits of the analog control unit 13, and the analog ICs (gate signal generation units) receive stop signals SA to SM. Then, gate signals HGA, LGA to HGM, LGM for turning off the two switch elements of the voltage equalization circuit are output to stop the operation of the voltage equalization circuit.

  FIG. 6 shows an example of a circuit board on which an abnormality detection / stop circuit of a voltage equalization circuit is mounted. FIG. 6 shows a configuration example in which 13 voltage equalization circuits 112A to 112M are mounted on the circuit board 100 in order to equalize the voltage between the 14 battery cells. Abnormality detection / stop circuits 122A to 122M are mounted on the circuit board 100 in correspondence with the voltage equalization circuits 112A to 112M.

  It is desirable that the power supply circuit 14 and the voltage equalization microcontroller 121 are mounted on the circuit board 100, and further the battery monitoring electronic control unit (ECU) 20 is mounted. The voltage equalization microcontroller 121 and the battery monitoring electronic control unit (ECU) 20 are mounted insulated from other circuit elements.

  As shown in FIG. 6, the abnormality detection / stop circuits 122A to 122M need to be mounted corresponding to the voltage equalization circuits 112A to 112M. Therefore, when these functions are realized by adding hardware circuits, The area has to be increased significantly, and problems such as increased costs arise.

  In addition, the voltage equalization circuit that performs active cell balancing, in comparison with the voltage equalization circuit that performs passive cell balancing, flows a large charge / discharge current to equalize the voltage in a short time. It is necessary to detect an abnormal current by accurately distinguishing between a large current within the design range and an abnormal large current outside the design range.

  In view of the above problems, the present invention accurately detects an abnormal current or an abnormal voltage of each battery cell in a voltage equalization circuit that causes a large charge / discharge current due to active cell balance to flow between the battery cells, and an abnormality has occurred. Provided is an abnormality detection device for a battery pack provided with a voltage equalization circuit, which can implement a function of stopping a voltage equalization operation of a voltage equalization circuit without increasing the area of a circuit board.

  An abnormality detection device in a battery pack provided with a voltage equalization circuit according to the present invention is a battery having a low battery voltage from a battery cell having a high battery voltage between adjacent battery cells to a plurality of battery cells connected in series. An abnormality detection device in a battery pack having a voltage equalization circuit for discharging current to cells and equalizing the voltage of each battery cell between adjacent battery cells, the voltage between the adjacent battery cells A current detecting means for detecting a level of a current flowing in each voltage equalizing circuit for turning on / off a current path discharged for equalization, and sending the current level to a microcontroller; The voltage information input from the battery monitoring electronic control unit that monitors the level of the current to be sent and the voltage of each battery cell is compared with a predetermined threshold value to detect an abnormality. A gate signal generation unit that generates a gate signal for controlling on / off of the current path of the voltage equalization circuit when the voltage equalization circuit is turned off. And a microcontroller for sending a stop signal to be stopped.

  The microcontroller is a voltage equalization microcontroller that controls on / off of a current path of the voltage equalization circuit and controls voltage equalization between the adjacent battery cells. .

  The microcontroller detects the occurrence of an undercurrent when the occurrence of an excessive current when the voltage equalization circuit is short-circuited or when the voltage equalization circuit is open based on the level of the current. When detected, the current path of the voltage equalization circuit is interrupted to send a stop signal for stopping the voltage equalization operation, and the occurrence of abnormality is notified to the host battery control electronic control unit. .

  In addition, when the microcontroller detects an overvoltage or undervoltage abnormality of each battery cell based on the voltage information of each battery cell, the microcontroller cuts off the current path of the voltage equalization circuit to equalize the voltage. A stop signal for stopping the operation is sent out, and the occurrence of abnormality is notified to the host battery control electronic control unit.

  Also, the voltage abnormality detection function of each battery cell is mounted on both the battery monitoring microcontroller of the battery monitoring electronic control unit and the voltage equalization microcontroller, and either of the two microcontrollers When an abnormality is detected, the microcontroller that detects the abnormality notifies the host battery control electronic control unit of the occurrence of the abnormality.

  In addition, a stop signal for stopping the voltage equalization operation is sent to each gate signal generation unit through a signal line connected in a daisy chain.

  According to the present invention, an abnormal current in a voltage equalization circuit for flowing a large charge / discharge current due to active cell balance between battery cells or an abnormal voltage of each battery cell is accurately detected, and voltage equalization in which an abnormality has occurred is detected. By mounting a function to stop the voltage equalization operation of the circuit in the microcontroller, it is not necessary to detect an abnormality for each voltage equalization circuit and stop the operation, and the circuit board area can be reduced. And cost can be reduced.

  In addition, since the thresholds for overcurrent / undercurrent and overvoltage / undervoltage can be changed by software, it is possible to change the threshold in a short time without changing the parts, etc., and maintenance is easy. Can be performed.

  In addition, by sending a stop signal for stopping the voltage equalization operation from the voltage equalization microcontroller, the gate signal for the normal voltage equalization operation generated from the gate signal generation unit can be used. It is possible to stop the equalization operation.

  In addition, by implementing the voltage abnormality detection function of each battery cell in both the battery monitoring microcontroller and the voltage equalization microcontroller, double safety can be achieved without increasing the circuit board area and cost. It becomes possible to ensure the sex.

  In addition, a stop signal for stopping the voltage equalization operation is sent to each gate signal generation unit via a signal line connected in a daisy chain, so that the number of voltage equalization circuits (n−1 for n battery cells) is increased. The number of signal lines and the number of pins of the microcontroller are eliminated, and the area of the circuit board can be reduced.

It is a figure which shows the structural example of the voltage equalization unit by this invention. It is a figure which shows the structural example of the whole battery pack provided with the voltage equalization circuit of this invention. It is a figure which shows the structural example of the circuit board containing the voltage equalization unit by this invention. It is a figure which shows the basic structural example of the voltage equalization circuit which performs active balance. It is a figure which shows the structural example which performs the abnormality detection for every voltage equalization circuit with a hardware circuit. It is a figure which shows the structural example of the circuit board containing the voltage equalization unit which performs abnormality detection with a hardware circuit.

  FIG. 1 shows a configuration example of a voltage equalization unit according to the present invention. As in the configuration example shown in FIG. 5, the voltage equalization unit 10 includes a power unit 11, a digital control unit 12, and an analog control unit 13. The configuration and operation for voltage equalization in the power unit 11, the digital control unit 12, and the analog control unit 13 are the same as the configuration and operation described with reference to FIG.

  Each voltage equalization circuit includes current detection units DA to DM that detect currents flowing through the voltage equalization circuits. The detection signals (current levels) of the current detection units DA to DM are the voltage equalization microcontroller 121. Is sent out. The voltage equalization microcontroller 121 is detected by the detection signals (current levels) of the current detection units DA to DM and the battery monitoring IC 21 of the battery monitoring electronic control unit (ECU) 20 and notified by the battery monitoring microcontroller 22. Input voltage information of each battery cell. Moreover, the voltage equalization microcontroller 121 inputs temperature information of each battery cell from a temperature detection unit (not shown).

  The voltage equalization microcontroller 121 monitors abnormal overcurrent / undercurrent, abnormal overvoltage / undervoltage, and temperature rise based on the values of current, voltage and temperature, and detects abnormal current, voltage or Stop signals (sleep signals) SA to SM for stopping the operation of the voltage equalization circuit where the temperature is detected are sent.

  The stop signals SA to SM are applied to analog ICs (gate signal generation units) corresponding to the voltage equalization circuits of the analog control unit 13, and the analog ICs (gate signal generation units) receive stop signals SA to SM. Then, gate signals HGA, LGA to HGM, LGM for turning off the two switch elements of the voltage equalization circuit are output to stop the operation of the voltage equalization circuit.

  The voltage equalization microcontroller 121 (1) generates an excessive current when the voltage equalization circuit is short-circuited, (2) generates an excessive current when the voltage equalization circuit is opened, (3) an excessive voltage (overvoltage of the battery cell voltage) Charging) and undervoltage (overdischarge), and (4) an abnormal temperature rise of the battery cell. When these abnormalities are detected, the voltage equalization circuit is stopped and the upper battery The control electronic control unit (ECU) 30 is notified of the occurrence of an abnormality by the communication function.

  The detection of the occurrence of excessive current when the voltage equalizing circuit (1) is short-circuited will be described. For example, when both ends of the inductors LA to LM of the voltage equalization circuit are short-circuited, an excessive abnormal current outside the design range flows when the switch element of the voltage equalization circuit is turned on. The abnormal current is detected by the voltage equalization microcontroller 121 via the current detection units DA to DM.

  In response to this abnormality, the voltage equalization circuit is stopped to prevent overdischarge due to an inappropriate voltage equalization operation, and the abnormality is generated by the communication function in the upper battery control electronic control unit (ECU) 30. By notifying and issuing an alarm signal in the battery control electronic control unit (ECU) 30, it is possible to minimize the adverse effect on the battery cell due to the abnormality.

  The detection of the occurrence of an undercurrent when the voltage equalizing circuit (2) is opened will be described. When at least one end of, for example, the inductors LA to LM of the voltage equalization circuit is disconnected or disconnected and becomes an open state, the charge / discharge current within the design range flows when the switch element of the voltage equalization circuit is turned on. Therefore, it becomes an undercurrent or no current outside the design range. This abnormal current is detected by the voltage equalization microcontroller 121 via the current detection units DA to DM.

  By controlling the voltage equalization circuit to stop in response to the occurrence of this abnormality, an inappropriate voltage equalization operation is prevented from being executed, and a communication function is provided to the host battery control electronic control unit (ECU) 30. Is notified of the occurrence of an abnormality, and an alarm signal is issued in the battery control electronic control unit (ECU) 30, thereby minimizing adverse effects on the battery cells due to the abnormality.

  The detection of the overvoltage (overcharge) and the undervoltage (overdischarge) of the battery cell voltage (3) will be described. The voltage of each battery cell is detected by the battery monitoring IC 21 of the pond monitoring electronic control unit (ECU) 20 and is notified from the battery monitoring microcontroller 22 to the voltage equalization microcontroller 121 as voltage information. The voltage equalization microcontroller 121 detects an abnormality by monitoring whether the notified voltage information exceeds a preset range of an overvoltage at the time of overcharge or an undervoltage at the time of overdischarge.

  In this manner, the voltage equalization microcontroller 121 is equipped with functions for detecting abnormalities of overcurrent / undercurrent, overcharge (overvoltage) / overdischarge (undervoltage), and excessive temperature rise of each battery cell. The voltage equalization microcontroller 121 sends stop signals (sleep signals) SA to SM for stopping the operation of the voltage equalization circuit to the analog control unit 13 when an abnormality is detected. When the stop signals SA to SM are input, the analog IC (gate signal generation unit) outputs gate signals HGA, LGA to HGM, and LGM for turning off the two switch elements of the voltage equalization circuit, and the voltage equalization circuit Stop the operation.

  FIG. 2 shows a configuration example of the entire battery pack including the voltage equalization circuit. The battery pack 50 includes a battery module 40, a voltage equalization unit 10, a battery monitoring electronic control unit (ECU) 20, and a battery control electronic control unit (ECU) 30. The voltage equalization unit 10 includes a voltage equalization circuit and a voltage equalization microcontroller (not shown), and equalizes the voltage between the battery cells of the battery module 40.

  The voltage equalization unit 10 is connected to a battery monitoring electronic control unit (ECU) 20 and a battery control electronic control unit (ECU) 30 through a communication path, and voltage information of each battery cell is obtained from the battery monitoring electronic control unit (ECU) 20. Obtaining and notifying the battery control electronic control unit (ECU) 30 of detection of abnormal voltage or abnormal current and stop of voltage equalization.

  Further, the battery monitoring electronic control unit (ECU) 20 and the battery control electronic control unit (ECU) 30 are also connected by a communication path, and the battery monitoring electronic control unit (ECU) 20 and the battery control electronic control unit (ECU) 30 are connected. It is possible to communicate information with.

  FIG. 3 shows a configuration example of a circuit board including a voltage equalizing unit according to the present invention. The configuration example of the circuit board shown in FIG. 3 is obtained by removing the abnormality detection / stop circuits 122A to 122M provided for the voltage equalization circuits 112A to 112M from the configuration example of the circuit board shown in FIG.

  The voltage and current abnormality detection and voltage equalization stop functions for the voltage equalization circuits 112A to 112M are implemented by the voltage equalization microcontroller 121. Therefore, the voltage equalization circuits 112A to 112M correspond to the abnormality. The detection / stop circuits 122A to 122M need not be mounted, and the above functions can be mounted on the circuit board without increasing the area of the circuit board. Therefore, the voltage equalization unit 10 and the battery monitoring electronic control unit (ECU) 20 can be configured (mixed) on the same circuit board without increasing the area of the circuit board.

  In addition, when determining whether the detected current, voltage, and temperature of each battery cell are values within the design range or abnormal values outside the design range, the detected current, voltage, and temperature values and predetermined values are determined. Is compared with the threshold value of the voltage equalization microcontroller 121 based on a digital value obtained by software processing in the voltage equalization microcontroller 121, so that the abnormality detection / stop circuits 122A to 122M using hardware electronic circuit components are individually compared. Therefore, there is no variation in determination due to variations in the characteristics of electronic circuit components and the like, and abnormality detection can be performed with high accuracy.

  Further, a stop signal for stopping the voltage equalization circuit is transmitted from the voltage equalization microcontroller 121 via a communication path daisy chained by SPI (Serial Peripheral Interface) communication, and is transmitted through one pin and signal line of SPI communication. By transmitting a stop signal for stopping all voltage equalization circuits, it is no longer necessary to provide as many signal lines and microcontroller pins as the number of voltage equalization circuits (n-1 for n battery cells). Further, the area of the circuit board can be reduced.

  In addition, the detection function of voltage abnormality (overvoltage due to overcharge and undervoltage due to overdischarge) of each battery cell is mounted on both the battery monitoring microcontroller 22 and the voltage equalization microcontroller 121 to be duplicated. When any of the microcontrollers detects an abnormality, the microcontroller that detects the abnormality notifies the host battery control electronic control unit (ECU) 30 of the occurrence of the abnormality.

  In this way, even if one microcontroller detects no abnormality due to malfunction, the other microcontroller detects the abnormality, notifies the battery control electronic control unit (ECU) 30 of the abnormality, and Double safety can be ensured without increasing the area and cost.

  The present invention is not limited to the embodiment described above, and various configurations or embodiments can be taken without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Voltage equalization unit 11 Power part 12 Digital control part 121 Voltage equalization microcontroller 13 Analog control part 20 Battery monitoring electronic control unit (ECU)
21 Battery monitoring IC
211 Analog to Digital Converter 22 Battery Monitoring Microcontroller 30 Battery Control Electronic Control Unit (ECU)
31 Battery control microcontroller 40 Battery module

Claims (6)

Voltage equalization that equalizes the voltage of each battery cell by discharging current from the battery cell having a high battery voltage to the battery cell having a low battery voltage between adjacent battery cells for a plurality of battery cells connected in series An abnormality detection device in a battery pack provided with a circuit between adjacent battery cells,
A current that detects a level of a current flowing through each voltage equalization circuit that turns on / off a current path that is discharged for voltage equalization between the adjacent battery cells, and sends the current level to a microcontroller Detection means;
The level of current sent from the current detection means and the voltage information input from the battery monitoring electronic control unit that monitors the voltage of each battery cell are compared with a predetermined threshold to detect an abnormality and detect the abnormality. When this occurs, the gate signal generator that generates a gate signal that controls on / off of the current path of the voltage equalization circuit is cut off and the voltage equalization operation is stopped. A microcontroller that sends out a stop signal,
An abnormality detection device for a battery pack comprising a voltage equalizing circuit.   The said microcontroller is a voltage equalization microcontroller which controls on / off of the electric current path of the said voltage equalization circuit, and controls voltage equalization between each said adjacent battery cell, It is characterized by the above-mentioned. An abnormality detection device for a battery pack comprising the voltage equalization circuit according to claim 1.   The microcontroller detects, based on the current level, the occurrence of an excessive current when the voltage equalization circuit is short-circuited, or the occurrence of an undercurrent when the voltage equalization circuit is open. And sending a stop signal for stopping the voltage equalization operation by interrupting the current path of the voltage equalization circuit and notifying the host battery control electronic control unit of the occurrence of an abnormality. An abnormality detection device for a battery pack comprising the voltage equalization circuit according to 1 or 2.   When the microcontroller detects an overvoltage or undervoltage abnormality of each battery cell based on the voltage information of each battery cell, the microcontroller cuts off the current path of the voltage equalization circuit and performs the voltage equalization operation. An abnormality detection device for a battery pack having a voltage equalization circuit according to claim 1 or 2, wherein a stop signal is sent to stop the battery control and an abnormality occurrence is notified to the upper battery control electronic control unit. .   The voltage abnormality detection function of each battery cell is mounted on both the battery monitoring microcontroller of the battery monitoring electronic control unit and the voltage equalization microcontroller, and either of the microcontrollers detects an abnormality. 3. A battery pack having a voltage equalization circuit according to claim 2, wherein when detected, the microcontroller that detects the abnormality notifies the host battery control electronic control unit of the occurrence of the abnormality. Anomaly detection device.   5. The voltage equalization according to claim 1, wherein a stop signal for stopping the voltage equalization operation is sent to each of the gate signal generation units through a signal line connected in a daisy chain. An abnormality detection device for a battery pack provided with a circuit.

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