JP6361502B2 - Battery monitoring device - Google Patents

Description

  The present invention relates to a battery monitoring device for monitoring the state (voltage, etc.) of each unit battery in an assembled battery configured by connecting a plurality of battery modules including a plurality of unit batteries connected in series by a conductive member such as a bus bar. .

  Conventionally, an integrated circuit (battery monitoring IC) that detects the voltage of each unit battery in an assembled battery that includes a plurality of unit batteries connected in series, and the voltage of each unit battery that is detected by the battery monitoring IC Based on the above, a power storage device that monitors the state of each unit battery is known (for example, Patent Document 1).

JP 2013-162635 A

  By the way, the assembled battery may be configured by connecting a large number of battery modules each composed of a relatively small number of unit batteries connected in series with a conductive member from the viewpoint of improving maintainability. In such a configuration, the number of unit batteries included in each battery module is smaller than the number of unit batteries whose voltage can be detected by the battery monitoring IC, and the unit batteries in which the battery monitoring ICs are connected in series across a plurality of battery modules. There are cases where each voltage is detected.

  FIG. 1 (FIGS. 1A and 1B) is a diagram illustrating an example of an assembled battery 100 and a battery monitoring IC 200 corresponding to such a configuration. Specifically, a battery pack 100 is configured by connecting a large number of battery modules MOD including three unit batteries C connected in series, and the battery monitoring IC 200 includes six batteries across the two battery modules MOD. The structure which detects the voltage of a cell is represented.

  However, when such a configuration is adopted, the following problems may occur.

  For example, there is a possibility that a connection abnormality may occur in the conductive members that connect the battery modules due to forgetting connection during maintenance (X portion in FIG. 1A). In particular, when a relay or the like provided between the assembled battery and a load (such as a motor) is connected in a state where a connection abnormality has occurred between battery modules subject to voltage detection by the battery monitoring IC, it is shown in FIG. As described above, a large current flows through the battery monitoring IC (thick arrow in FIG. 1B). As a result, the battery monitoring IC itself or the fuse of the satellite substrate that protects the battery monitoring IC may be broken.

  Therefore, in view of the above problems, when the voltage of each battery cell across a plurality of battery modules is detected by the battery monitoring IC, it is possible to determine a connection abnormality state due to forgetting connection between the plurality of battery modules. An object is to provide a battery monitoring device.

In order to solve the above problem, in one embodiment, the battery monitoring device includes:
A battery pack composed of a plurality of unit cells connected in series, and among the plurality of unit cells, a plurality of battery modules composed of two or more unit cells connected in series are connected in series with conductive members, respectively. An assembled battery,
A battery monitoring IC that detects a voltage of each unit battery continuously connected across at least two battery modules included in the plurality of battery modules among the plurality of unit batteries;
A monitoring unit that monitors the states of the plurality of unit batteries based on the voltage detected by the battery monitoring IC;
Of the at least two battery modules, the first electric power supplied from the unit cells included in the two continuous battery modules in a mode of passing through the conductive member connecting the two continuous battery modules. An operation circuit unit that operates according to a predetermined function in the battery monitoring IC; and
When the predetermined function is not executed, a connection abnormality determination unit that determines that there is a connection abnormality in the conductive member that connects the two continuous battery modules is provided.

  According to the above embodiment, when the voltage of each battery cell across the plurality of battery modules is detected by the battery monitoring IC, the battery monitoring that can determine the state of connection abnormality due to forgetting connection between the plurality of battery modules An apparatus can be provided.

It is a figure showing an example of composition by which voltage detection of each unit battery connected in series across a plurality of battery modules by battery monitoring IC is performed. It is a block diagram which shows an example of a structure of the vehicle containing the battery monitoring apparatus which concerns on 1st Embodiment. It is a block diagram which shows an example of a structure of the battery monitoring apparatus which concerns on 1st Embodiment. It is a block diagram which shows an example of a structure of the monitoring IC which concerns on 1st Embodiment. It is a flowchart which shows notionally an example of the process including the periodical communication by the battery monitoring apparatus (battery ECU) which concerns on 1st Embodiment. It is a flowchart which shows notionally an example of the connection abnormality determination process by the battery monitoring apparatus (battery ECU) which concerns on 1st Embodiment. It is a block diagram which shows an example of a structure of the monitoring IC which concerns on 2nd Embodiment. It is a flowchart which shows notionally an example of the connection abnormality determination process by the battery monitoring apparatus (battery ECU) which concerns on 2nd Embodiment. It is a block diagram which shows an example of a structure of the monitoring IC which concerns on the modification of 2nd Embodiment. It is a flowchart which shows notionally an example of the connection abnormality determination process by the battery monitoring apparatus (battery ECU) which concerns on the modification of 2nd Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

[First Embodiment]
FIG. 2 is a block diagram illustrating an example of a configuration of a vehicle including the battery monitoring device 1 according to the present embodiment. FIG. 3 is a block diagram showing an example of the configuration of the battery monitoring device 1 according to the present embodiment. In FIG. 2, a solid line indicates a power supply line, a dotted line indicates a communication line, and a double line indicates a power transmission line.

  The battery monitoring device 1 is mounted on a vehicle (series / parallel hybrid vehicle) and is configured to be able to supply electric power to a motor 50 that is one of driving power sources of the vehicle (battery cells C1 to C1). C54) is monitored.

  The battery unit 10 (battery cells C1 to C54) is discharged by supplying electric power (three-phase alternating current) to the motor 50 via the motor inverter 70. In addition, the battery unit 10 (battery cells C1 to C54) generates power (three-phase alternating current) generated by the generator 60 using the engine 40, which is one of the driving power sources of the vehicle, as a power source via the generator inverter 80. It is charged by being supplied as DC power. Further, the battery unit 10 (battery cells C1 to C54) is supplied with regenerative power (three-phase alternating current) by the motor 50 functioning as a generator when the vehicle is decelerated as DC power via the motor inverter 70. Charged.

  The battery monitoring device 1 includes a battery unit 10 included in the battery pack 2, a battery ECU (Electric Control Unit) 20, and a system main relay (System Main Relay: SMR) 25. Further, the vehicle includes an HV-ECU 30 as a component related to the battery monitoring device 1.

  In the following, the inside of the battery unit 10 that outputs a high voltage is mainly referred to as a high voltage system, and the inside of the battery ECU 20 that is driven at a low voltage (excluding the interface unit with the battery unit 10) is mainly referred to as a low voltage system. There is a case.

  The battery unit 10 includes an assembled battery 11, a monitoring IC (Integrated Circuit) 12, and the like.

  The assembled battery 11 includes a plurality of unit batteries (54 battery cells C1 to C54 in this embodiment) connected in series. Specifically, among the battery cells C1 to C54, a plurality of battery modules (18 batteries in the present embodiment) including two or more unit batteries (three battery cells in the present embodiment) connected in series. Modules MOD1 to MOD18) are connected in series with conductive members CBL1 to CBL17 (for example, bus bars and connection wirings), respectively. In this way, by configuring an assembled battery with a relatively large number of battery modules, even if some battery modules malfunction, the unit (battery module) to be replaced can be minimized, thus reducing maintenance costs. can do.

  Battery cells C1 to C54 are 54 unit batteries. Each battery cell C1-C54 may be a unit cell of a lithium ion battery, for example.

  The battery cells C1 to C54 may have any configuration as long as they are chargeable / dischargeable unit batteries, and may be other secondary batteries (such as nickel metal hydride batteries) or capacitors. In addition, the number of battery cells (54) and the number of battery modules (18) included in the assembled battery 11 are examples, and may be any number.

  The battery modules MOD1 to MOD18 are configured by accommodating three battery cells included in the battery cells C1 to C54 in a predetermined housing or the like in a state of being connected in series. Specifically, battery cells C1 to C3, battery cells C4 to C6,..., Battery cells C52 to C54 that are successively connected in the order of the battery modules MOD1, MOD2,. It is. The casings of the battery modules MOD1 to MOD18 are a positive electrode terminal corresponding to the positive electrode of a battery cell located at one end on the high potential side (for example, a battery cell C1 of the battery module MOD1) and a battery cell located on the other end on the low potential side. For example, a negative electrode terminal corresponding to the negative electrode of the battery module MOD1 is provided. The battery modules MOD1, MOD2,..., MOD18 from the high potential side are connected by conductive members CBL1 to CBL17 between the negative electrode terminal and the positive electrode terminal of each adjacent battery module. Thereby, the assembled battery 11 as a series connection body (series connection body of battery cells C1 to C54) of the battery modules MOD1 to MOD18 is completed.

  The assembled battery 11 includes a positive terminal V + extending from the positive terminal (the positive electrode of the battery cell C1) of the battery module MOD1, and a negative terminal V− extending from the negative terminal (the negative electrode of the battery cell C54) of the battery module MOD18. The output voltage (for example, about 200 V) required by the vehicle can be taken out.

  The monitoring IC 12 is a voltage detection circuit configured as an integrated circuit, and specifically detects the voltage of the battery cells C1 to C54. The monitoring IC 12 has, for example, seven voltage detection ports for inputting voltage detection lines, and two adjacent ports among the ports are used as one voltage detection channel. Can be detected. Hereinafter, the nine monitoring ICs 12 included in the battery monitoring device 1 are distinguished from each other by “s monitoring ICs 12-1 to 12-9”.

  The number (6) of battery cells whose voltage can be detected by the monitoring IC 12 is an example, and may be an arbitrary number.

  Each of the monitoring ICs 12-1 to 12-9 has six battery cells connected in series among the battery cells C <b> 1 to C <b> 54 as targets for voltage detection. In other words, each of the monitoring ICs 12-1 to 12-9 targets six battery cells included in two battery modules connected in series among the battery modules MOD 1 to MOD 18 for voltage detection. Specifically, battery cells C1 to C6 (battery modules MOD1 and 2) as voltage detection targets and battery cells C7 to C12 (battery modules) in the order of monitoring ICs 12-1, 12-2,. MOD3-4), ..., battery cells C49-C54 (battery modules MOD17-18) are assigned.

  Each of the monitoring ICs 12-1 to 12-9 is daisy chain connected to the battery ECU 20 (a microcomputer 22 described later). That is, all communication between the battery ECU 20 and each monitoring IC 12 (12-1 to 12-9) is executed via the monitoring IC 12-9.

  In the daisy chain connection, each of the monitoring ICs 12-1 to 12-9 that controls each of the monitoring ICs 12-1 to 12-9 (transmits commands corresponding to various instructions) is the upper side (the highest level). ˜12-9 is the lower side (the monitoring IC 12-1 is the lowest). The daisy chain connection is a so-called circulation type daisy chain. That is, various commands (standby command, address learning command, voltage output command, etc.) transmitted from the battery ECU 20 (microcomputer 22), which will be described later, to the monitoring ICs 12-1 to 12-9 are the monitoring ICs 12-1 to 12-9. Is returned to the battery ECU 20 (microcomputer 22). Although omitted in FIG. 3, a filter for removing noise is provided between each battery cell C <b> 1 to C <b> 54 (positive detection point and negative detection point) and each port of each monitoring IC 12-1 to 12-9. A circuit, a cell balance circuit (equalization circuit) that eliminates a bias in the state of charge (voltage) of each of the battery cells C1 to C54, a fuse, and the like may be arranged.

  Here, the configuration of the monitoring IC 12 will be described in more detail with reference to FIG.

  FIG. 4 is a block diagram illustrating an example of the configuration of the monitoring IC 12 according to the present embodiment.

  In addition, since all the structures of monitoring IC12 (12-1 to 12-9) are the same, in FIG. 4, the structure of monitoring IC12-2 is illustrated.

  The monitoring IC 12 (12-2) includes a voltage detection unit 121, an upper communication circuit 122, a lower communication circuit 123, an upper communication power supply 124, a lower communication power supply 125, and the like.

  The voltage detection unit 121 is voltage detection means for detecting the voltage of the input battery cell to be detected. For example, the voltage detection unit 121 may include a multiplexer and an AD converter that receive voltages of six battery cells that are voltage detection targets. In other words, the voltage detection unit 121 may be configured to time-series multiplex the voltages (analog signals) of the six battery cells using a multiplexer and convert the voltage into a corresponding digital signal using the reference voltage using an AD converter. The voltage detection unit 121 may include six AD converters, and each AD converter may convert the voltage (analog signal) of each battery cell into a corresponding digital signal. In response to a voltage detection instruction from the battery ECU 20 (microcomputer 22) received by the host communication circuit 122, the voltage detection unit 121 detects the voltage of each battery cell as a voltage detection target, and converts the voltage to the voltage of each battery cell. A corresponding detection signal is transmitted to the upper communication circuit 122.

  The upper communication circuit 122 is a logic circuit that realizes a communication function with the upper side (the upper side monitoring IC 12 or the battery ECU 20) in the daisy chain connection. For example, the upper communication circuit 122 in the monitoring IC 12-2 executes communication with the upper monitoring IC 12-3, and the upper communication circuit 122 in the monitoring IC 12-9 is connected to the upper battery ECU 20 (microcomputer 22). Execute communication. The upper communication circuit 122 operates by supplying power from the upper communication power supply 124.

  The upper communication circuit 122 receives various instruction commands from the battery ECU 20 (microcomputer 22) transmitted from the upper side and executes various processes according to the received commands. For example, when a command for instructing voltage detection is received, a process for operating the voltage detection unit 121 (such as a multiplexer or an AD converter) to detect the voltage of each battery cell to be detected is executed. Further, when various commands (including those for all the monitoring ICs 12) for the lower-level monitoring IC 12 are received, the various commands are transmitted (transferred) to the lower-level communication circuit 123.

  Further, the upper communication circuit 122 transmits (transfers) a detection signal corresponding to the voltage of each battery cell transmitted from the voltage detection unit 121 to the upper side (upper side monitoring IC 12 or battery ECU 20). Further, the upper communication circuit 122 receives information (such as a detection signal corresponding to the voltage of each battery cell) transmitted from the lower monitoring IC 12 in response to various commands from the battery ECU 20 (microcomputer 22) from the lower communication circuit 123. It is received and transmitted (transferred) to the upper side (upper side monitoring IC 12 or battery ECU 20).

  The lower-order communication circuit 123 is a logic circuit that realizes a communication function with the lower-order side (the monitoring IC 12) in the daisy chain connection. For example, the lower-level communication circuit 123 in the monitoring IC 12-2 performs communication with the lower-level monitoring IC 12-1. The lower communication circuit 123 operates by supplying power from the lower communication power supply 125.

  When the lower communication circuit 123 receives from the upper communication circuit 122 a command of various instructions from the battery ECU 20 (microcomputer 22) transmitted from the upper side, the lower communication circuit 123 transmits (transfers) it to the lower monitoring IC 12.

  Note that the lower communication circuit 123 in the monitoring IC 12-1 located at the lowest position of the daisy chain again sends various instruction commands from the battery ECU 20 (microcomputer 22) transmitted from the upper communication circuit 122 to the upper communication circuit. 22 (return).

  When the lower communication circuit 123 receives information (such as a detection signal corresponding to the voltage of each battery cell) transmitted from the lower monitoring IC 12 in response to various commands from the battery ECU 20 (microcomputer 22), the upper communication Transmit (transfer) to the circuit 122.

  The upper communication power supply 124 is power supply means (power supply circuit) that supplies electric power for operating the upper communication circuit 122. The upper communication power supply 124 uses a power supplied from a battery cell included in the battery module on the low potential side of the two battery modules to be detected by the monitoring IC 12, to operate the upper communication circuit 122. An output voltage (for example, 3.3V) is generated. For example, the upper communication power supply 124 in the monitoring IC 12-2 is the power from the battery cells C10 to C12 connected in series in the battery module MOD4 on the low potential side among the battery modules MOD3 and 4 for voltage detection. Is used to generate a predetermined output voltage that activates the upper communication circuit 122. In addition, power from the battery cells included in the low-potential side battery module is supplied to the host communication power supply 124 without passing through the conductive member that connects the battery modules to be detected with voltage. For example, the host communication power supply 124 in the monitoring IC 12-2 is supplied from the battery cells C10 to C12 that are continuously connected in series without passing through the conductive member CBL3 that connects the battery modules MOD3 and 4 that are voltage detection targets. Power is supplied.

  The lower communication power supply 125 is power supply means (power supply circuit) that supplies power for operating the lower communication circuit 123. The lower communication power supply 125 is connected to the battery cells included in the two battery modules in such a manner as to pass through the conductive member connecting the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12. A predetermined output voltage (for example, 3.3 V) for operating the lower communication circuit 123 is generated using the supplied power. For example, the lower-level communication power supply 125 in the monitoring IC 12-2 is supplied from the battery cells C7 to C9 that are continuously connected in series in a mode that passes through the conductive member CBL3 that connects the battery modules MOD3 and 4 that are voltage detection targets. A predetermined output voltage for operating the lower-level communication circuit 123 is generated using the generated power.

  Returning to FIG. 3, the battery ECU 20 is an electronic control unit that monitors the state of the battery unit 10 (battery cells C1 to C54). The battery ECU 20 includes an isolator 21, a microcomputer 22, and the like, and is communicably connected to the HV-ECU 30 through an in-vehicle LAN or the like.

  The isolator 21 realizes electrical insulation between the battery unit 10 belonging to the high voltage system and the microcomputer 22 belonging to the low voltage system, and between the monitoring IC 12 (12-9) in the battery unit 10 and the microcomputer 22. A known isolated interface that enables communication.

  The microcomputer 22 is processing means for executing various arithmetic processes by executing various programs stored in the ROM on the CPU.

  The microcomputer 22 periodically instructs the monitoring ICs 12-1 to 12-9 to detect the voltages of the battery cells C1 to C54 and to transmit a detection signal corresponding to the detected voltage ( Voltage output command) is transmitted to the monitoring IC 12 (12-9). As described above, since the microcomputer 22 and each of the monitoring ICs 12-1 to 12-9 are daisy chain connected, the command transmitted from the microcomputer 22 is the monitoring IC 12-9 → the monitoring IC 12-8,. -1 in order. The detection signals corresponding to the voltages of the battery cells C1 to C54 detected by the monitoring ICs 12-1 to 12-9 in response to the voltage output command are the monitoring IC 12-1 → the monitoring IC 12-2,. Are transmitted in the order of the monitoring IC 12-9 and transmitted from the monitoring IC 12-9 to the microcomputer 22. Hereinafter, the communication between the microcomputer 22 and the monitoring ICs 12-1 to 12-9 that are periodically executed is referred to as “periodic communication”.

  FIG. 5 is a flowchart conceptually showing an example of processing including regular communication by the battery monitoring apparatus 1 (battery ECU 20) according to the present embodiment. The flowchart is started when a connection abnormality determination process (FIG. 6) described later is executed and a connection abnormality is not determined. Further, at the start of the flowchart, the address information of the monitoring ICs 12 (12-1 to 12-9) has already been acquired by the connection abnormality determination process described later.

  In step S10, the microcomputer 22 learns the number of monitoring ICs connected in a daisy chain based on the address information of the monitoring ICs 12 (12-1 to 12-9) already acquired.

  In step S20, the microcomputer 22 transmits a command (voltage output command) instructing to detect and transmit the voltages of all the battery cells C1 to C54.

  The microcomputer 22 starts counting the internal timer when it transmits the voltage output command.

  In step S30, the microcomputer 22 has received a communication frame (voltage output frame) from the monitoring IC 12 (12-1 to 12-9) including detection signals corresponding to the voltages of all the battery cells C1 to C54. Determine whether. The microcomputer 22 proceeds to step S40 when the voltage output frame is received, and proceeds to step S50 when the voltage output frame is not received.

  In step S40, the microcomputer 22 determines whether or not the regular communication is to be terminated due to ignition off (IG-OFF) or the like of the vehicle. The microcomputer 22 ends the flowchart when the regular communication is terminated, and repeats the processes of steps S20 to S40 when the regular communication is not terminated.

  On the other hand, in step S50, the microcomputer 22 determines whether or not the count value of the internal timer executed in association with the process of step S20 is equal to or greater than a predetermined value α1. If the count value is not equal to or greater than the predetermined value α1, the microcomputer 22 returns to step S30, repeats the processes of steps S30 and S50, and proceeds to step S60 when the count value is equal to or greater than the predetermined value α1.

  The predetermined value α1 is a count value corresponding to a time longer than the maximum value of the time assumed from the transmission of the voltage output command by the microcomputer 22 to the reception of the voltage output frame.

  In step S60, the microcomputer 22 executes a fail safe process and ends the process of the flowchart. Specifically, by transmitting a signal indicating that the voltages of the battery cells C1 to C54 cannot be detected to the battery cells C1 to C54, charging / discharging of the battery cells C1 to C54 by the HV-ECU 30 is prohibited or restricted. You can do it. Further, a predetermined indicator (an indicator notifying that battery monitoring cannot be properly performed) may be displayed on a meter or the like in the passenger compartment of the vehicle, and the vehicle may be brought into a dealer or the like.

  Note that the processing of steps S50 to S60 is an emergency in which the communication members CBL1 to CBL1 to 17 that connect the battery modules MOD1 to MOD18 or the communication line between the battery ECU 20 and the monitoring IC 12 are disconnected while the vehicle 100 is traveling, for example. This is a process for detecting a rare phenomenon.

  As described above, the microcomputer 22 periodically executes the process of receiving the detection signals corresponding to the voltages of the battery cells C1 to C54 from the monitoring ICs 12 (12-1 to 12-9), thereby the battery cells C1 to C1. The state of C54 can be monitored appropriately. In addition, when the microcomputer 22 cannot receive the detection signal corresponding to the voltage of the battery cells C1 to C54, the microcomputer 22 determines that appropriate battery monitoring cannot be performed, and executes fail-safe processing.

  Returning to FIG. 3, the microcomputer 22 calculates the voltage of the battery cells C <b> 1 to C <b> 54 based on the detection signal transmitted from the monitoring IC 12 (12-1 to 12-9). Hereinafter, based on detection signals transmitted from the monitoring ICs 12 (12-1 to 12-9), the voltages of the battery cells C1 to C54 calculated by the microcomputer 22 are detected by the “monitoring ICs 12 (12-1 to 12-9). The voltage of the battery cells C1 to C54 to be performed ".

  Further, the microcomputer 22 determines the state (voltage, current, state of charge (SOC: State Of) of the battery cells C1 to C54 based on the voltage of the battery cells C1 to C54 detected by the monitoring IC 12 (12-1 to 12-9). Charge), deterioration state (SOH: State Of Health, etc.) is monitored. For example, the state of charge of the battery cells C1 to C54 may be monitored depending on whether or not the voltage of each of the battery cells C1 to C54 is within a predetermined range (between a predetermined upper limit value and a predetermined lower limit value). When any of the battery cells C1 to C54 reaches the upper limit value, it is determined that the battery is overcharged. When the battery cell C1 to C54 reaches the lower limit value, it is determined that the battery is overdischarged, and the battery cells C1 to C54 are charged via the HV-ECU 30. The discharge may be controlled. Specifically, a signal indicating that any one of the battery cells C1 to C54 is overcharged (overcharge signal) or a signal indicating that it is overdischarged (overdischarge signal) is transmitted to the HV-ECU 30.

  In addition, the microcomputer 22 is information regarding the state of the battery cells C1 to C54 other than the above signals (overcharge signal, overdischarge signal) (for example, a signal indicating the current charge state (charge rate) or a signal indicating the current deterioration state). Etc.) may be transmitted.

  Moreover, the microcomputer 22 determines the presence or absence of a connection abnormality between two battery modules corresponding to six battery cells connected in series that are voltage detection targets of the monitoring ICs 12-1 to 12-9. Processing (connection abnormality determination processing) is executed. Specifically, it is determined whether or not there is a connection abnormality such as forgetting connection or disconnection of the conductive member connecting the two battery modules. Details of the connection abnormality determination processing by the microcomputer 22 will be described later.

  The SMR 25 is a connection state switching unit that connects and disconnects the power supply path between the assembled battery 11 and a load (motor 50, generator 60, motor inverter 70, generator inverter 80). The SMR 25 includes an SMR 25a provided in a connection path with a load on the positive electrode terminal V + side of the assembled battery 11, and an SMR 25b provided in a connection path with a load on the negative electrode terminal V− side of the assembled battery 11. The state (connected or disconnected) of the SMR 25 is switched based on a control instruction from the battery ECU 20 (microcomputer 22).

  The HV-ECU 30 is an electronic control unit that executes various controls related to the vehicle including charge / discharge control of the battery unit 10 (battery cells C1 to C54). The HV-ECU 30 may be configured by a microcomputer, for example, and may execute various control processes including charge / discharge control by executing various programs stored in the ROM on the CPU.

  The HV-ECU 30 may execute charge / discharge control based on information transmitted from the battery ECU 20 (microcomputer 22). For example, when the HV-ECU 30 receives an overcharge signal from the microcomputer 22, the HV-ECU 30 may execute control to suppress (prohibit) charging of the battery cells C <b> 1 to C <b> 54 and promote discharge. Moreover, HV-ECU30 may perform control which promotes charge of battery cell C1-C54, and suppresses (prohibits) discharge, when the overdischarge signal is received from the microcomputer 22. FIG.

  The HV-ECU 30 is configured to be able to control the operations of the engine 40, the motor 50, and the generator 60. That is, the HV-ECU 30 controls the charging / discharging control of the battery unit 10 (battery cells C1 to C54) by controlling the engine 40, the motor 50, and the generator 60 according to the traveling state of the vehicle and the operation by the driver. Execute.

  The HV-ECU 30 controls the operation of the motor 50 and the generator 60 by driving and controlling the motor inverter 70 and the generator inverter 80. The HV-ECU 30 is connected to the engine 40, the motor 50 (motor inverter 70), and the generator 60 (generator inverter 80) via another ECU that directly controls the engine 40, motor 50 (motor inverter 70), Control of the generator 60 (generator inverter 80) may be executed.

  Next, details of the connection abnormality determination process by the battery monitoring apparatus 1 (battery ECU 20) according to the present embodiment will be described.

  FIG. 6 is a flowchart conceptually showing an example of connection abnormality determination processing by the battery monitoring apparatus 1 (battery ECU 20) according to the present embodiment.

  The flowchart is started when the vehicle is ignited (IG-ON). Further, when the ignition of the vehicle is turned off, the battery ECU 20 (microcomputer 22) shuts off the SMR 25 (OFF). That is, at the start of the flowchart, the SMR 25 is in a blocked (OFF) state.

  In step S101, the microcomputer 22 transmits a standby command to the monitoring IC 12 (12-1 to 12-9). Thereby, monitoring IC12 (12-1 to 12-9) transfers to the state which can detect the voltage of battery cell C1-C54.

  In step S102, the microcomputer 22 transmits an address learning command to the monitoring IC 12 (12-1 to 12-9).

  The microcomputer 22 starts counting the internal timer when transmitting the address learning command.

  In step S <b> 103, the microcomputer 22 determines whether a communication frame (address information frame) related to address information is received from the monitoring IC 12. When the microcomputer 22 receives the address information frame, the microcomputer 22 is connected between two battery modules corresponding to six battery cells connected in series that are voltage detection targets of the monitoring ICs 12-1 to 12-9. It is determined that there is no abnormality, and the process proceeds to step S104. If the microcomputer 22 has not received the address information frame, the microcomputer 22 proceeds to step S105.

  In step S104, the microcomputer 22 connects (ON) the SMR 25 and ends the process of the flowchart. That is, the microcomputer 22 permits the power transfer between the assembled battery 11 and the load (motor 50, generator 60, motor inverter 70, generator inverter 80).

  On the other hand, in step S105, the microcomputer 22 determines whether or not the count value of the internal timer is equal to or greater than the predetermined value β1. If the count value is not equal to or greater than the predetermined value β1, the microcomputer 22 returns to step S103 and repeats the processes of steps S103 and S105. When the count value is equal to or greater than the predetermined value β1, the microcomputer 22 is connected to any one of the two battery modules corresponding to the six battery cells connected in series that are the voltage detection targets of each monitoring IC 12 It is determined that there is an abnormality, and the process proceeds to step S106.

  Note that the predetermined value β1 is a count value corresponding to a time longer than the maximum value of the time expected from the transmission of the address learning command by the microcomputer 22 to the reception of the address information frame.

  In step S106, the microcomputer 22 performs connection abnormality notification and diagnosis processing, and continues the state in which the SMR 25 is shut off (OFF) as long as the connection abnormality state continues, and ends the processing of the flowchart. To do.

  The connection abnormality notification may be executed, for example, by displaying a predetermined indicator on a meter in the passenger compartment of the vehicle. The diagnosis process is a process of storing information indicating that a connection abnormality has occurred in the internal memory as failure diagnosis information in the battery ECU 20.

  As described above, when the battery monitoring apparatus 1 according to the present embodiment transmits a predetermined command (address learning command) to the monitoring IC 12 and can receive a communication frame corresponding to the predetermined command from the monitoring IC 12, a connection error occurs. Judge that there is no. On the other hand, when the communication frame corresponding to the command cannot be received from the monitoring IC 12, it is determined that there is a connection abnormality.

  More specifically, as described above, the lower communication circuit 123 in the monitoring IC 12 operates with the power supplied from the lower communication power supply 125. The lower communication power supply 125 is a battery included in the two battery modules in such a manner that it passes through a conductive member that connects the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12. It is generated using power supplied from the cell. Therefore, when connection abnormality such as forgetting connection of a conductive member or disconnection occurs, the lower communication power supply 125 cannot generate a predetermined output voltage for operating the lower communication circuit 123, and the lower communication circuit 123 cannot operate. That is, the monitoring IC 12 (12-1 to 12-9) cannot respond to a predetermined command from the battery ECU 20 (microcomputer 22) connected in a daisy chain. Therefore, the microcomputer 22 can determine whether or not there is a connection abnormality by transmitting a predetermined command to the monitoring IC 12 and checking whether or not a communication frame corresponding to the predetermined command can be received from the monitoring IC 12. it can.

  In addition, since the microcomputer 22 and the monitoring ICs 12 (12-1 to 12-9) are connected in a daisy chain and regularly execute communication, the connection abnormality depends on whether the communication function is properly executed. Since the presence or absence is determined, the connection abnormality determination can be performed relatively easily.

  Further, when the SMR 25 is connected in a state where there is a connection abnormality in the conductive member connecting the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12, the monitoring IC 12 is bypassed. There is a possibility that current flows through the assembled battery 11. That is, when a large current flows through the monitoring IC 12, the monitoring IC 12 itself or the fuse of the satellite substrate that protects the monitoring IC 12 may be destroyed. However, as described above, the battery monitoring device 1 according to the present embodiment can determine the presence or absence of a connection abnormality. Therefore, when it is determined that there is a connection abnormality, the problem is caused by continuing to shut off the SMR 25. Can be prevented.

  The host communication power supply 124 uses the power supplied in such a manner as to pass through the conductive member that connects the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12. A predetermined output voltage that activates the circuit 122 may be generated. In addition, both the upper communication power supply 124 and the lower communication power supply 125 may generate a predetermined output voltage that operates the upper communication circuit 122 and the lower communication circuit 123. Instead of the upper communication power supply 124 and the lower communication power supply 125, a common power supply that generates a predetermined output voltage for operating both the upper communication circuit 122 and the lower communication circuit 123 may be employed in this manner. Also in these cases, if there is a connection abnormality, the monitoring IC 12 cannot respond to a predetermined command from the microcomputer 22, and therefore can determine the presence or absence of a connection abnormality by the same method.

  Further, instead of the communication function with the battery ECU 20 (microcomputer 22) in the monitoring IC 12, the presence or absence of a connection abnormality may be determined based on whether another predetermined function in the monitoring IC 12 is executed. For example, the presence or absence of a connection abnormality is determined by whether or not the battery cell voltage detection function in the monitoring IC 12 is executed. In such a case, the predetermined power source that operates the voltage detection unit 121 is a conductive member that connects the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12, as in the lower communication power source 125. What is necessary is just to use the electric power supplied by the aspect to pass.

  In addition, the battery monitoring device 1 specifies the location (one of the conductive members CBL1 to CBL17) where the connection abnormality has occurred by specifying which monitoring IC 12 connected in a daisy chain is not executed. May be. For example, in the case of the configuration of the present embodiment, a connection abnormality has occurred when the destination of a command transmitted from the microcomputer 22 to the monitoring IC 12 is a specific monitoring IC 12 (any one of the monitoring ICs 12-1 to 12-7). The location can be specified. Specifically, the microcomputer 22 sequentially transmits commands while changing the destination in order from the monitoring IC 12 on the upper side. In the process, if there is a destination that does not respond to the command transmitted from the microcomputer 22, it is considered that the command is not transmitted from the monitoring IC 12 that is one higher than the monitoring IC 12 that is the destination. Therefore, when there is a destination that does not respond, the microcomputer 22 is connected between two battery modules corresponding to the six battery cells that are voltage detection targets of the monitoring IC 12 that is one higher than the monitoring IC that is the destination. It can be determined that there is a connection abnormality.

[Second Embodiment]
Next, a second embodiment will be described.

  In the battery monitoring device 1 according to the present embodiment, the mode of supplying power to the power source for executing a predetermined function in the monitoring IC 12 is between the mode of not passing through the conductive member connecting the two battery modules. This is different from the first embodiment in that switching is possible. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and different portions will be mainly described.

  Note that the configuration of the battery monitoring device 1 according to the present embodiment is represented by FIGS. 2 to 3 as in the first embodiment except that the internal configuration of the monitoring IC 12 is different, and thus the description thereof is omitted.

  First, the configuration of the monitoring IC 12 will be described in more detail with reference to FIG.

  FIG. 7 is a block diagram illustrating an example of the configuration of the monitoring IC 12 according to the present embodiment.

  Since all the configurations of the monitoring ICs 12 (12-1 to 12-9) are the same, the configuration of the monitoring IC 12-2 is illustrated in FIG.

  The monitoring IC 12 (12-2) includes a voltage detection unit 121, a communication circuit 126, a power supply 127, a changeover switch 128, and the like.

  Note that the voltage detection unit 121 has the same configuration as that of the first embodiment, and a description thereof will be omitted.

  The communication circuit 126 is a logic circuit that realizes a communication function between the upper side (upper side monitoring IC 12 or the battery ECU 20) and the lower side (lower side monitoring IC 12) in the daisy chain connection. The communication circuit 126 operates by supplying power from the power source 127. The specific processing operation by the communication circuit 126 is the same as the processing operation in the upper communication circuit 122 and the lower communication circuit 123 of the first embodiment (excluding the transfer processing operation between them), and thus detailed description thereof is omitted. .

  The power supply 127 is a power supply unit (power supply circuit) that operates the monitoring IC 12 (the function units including the voltage detection unit 121, the communication circuit 126, and the like). The power supply 127 can receive power supply from at least one of the six battery cells that are the voltage detection targets of the monitoring IC 12 through two different power supply paths by the action of the changeover switch 128.

  In other words, the power supply 127 is configured such that the battery included in the two battery modules does not pass through the conductive member that connects the two battery modules corresponding to the six battery cells to be detected by the action of the changeover switch 128. Power can be supplied from the cell. For example, the power supply 127 in the monitoring IC 12-2 configures the battery module MOD4 on the low potential side in a mode that does not pass through the conductive member CBL3 that connects the battery modules MOD3 and 4 corresponding to the battery cells C7 to C12 to be voltage detected. Power is supplied from battery cells C10 to C12. And the predetermined | prescribed output voltage which operates monitoring IC12-2 can be produced | generated using the said electric power. Note that the power supply 127 in the monitoring IC 12-2 may receive power from the battery cells C7 to C9 constituting the battery module MOD3 on the high potential side as long as the power supply 127 does not pass through the conductive member CBL3.

  In addition, the power supply 127 is configured such that two batteries are connected in such a manner as to pass through the conductive member connecting the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12 by the action of the changeover switch 128. Electric power can be received from the battery cells included in the module. For example, the power supply 127 in the monitoring IC 12-2 includes the battery cells included in the battery modules MOD3 and 4 in such a manner as to pass through the conductive member CBL3 that connects the battery modules MOD3 and 4 corresponding to the battery cells C7 to C12 to be detected. Power is supplied from C7 to C12. And the predetermined | prescribed output voltage which operates monitoring IC12-2 can be produced | generated using the said electric power.

The changeover switch 128 is a path switching unit that switches a power supply path to the power supply 127. Specifically, the power supply path to the power source 127 can be switched by selecting and connecting the movable contact MC to either the fixed contact c1 or c2. When the movable contact MC is connected to the fixed contact c1, the power source 127 does not pass through the conductive member that connects the two battery modules corresponding to the six battery cells to be detected by the monitoring IC 12, Electric power is supplied from the battery cells included in the two battery modules. When the movable contact MC is connected to the fixed contact c2, the power supply 127 passes through a conductive member that connects the two battery modules corresponding to the six battery cells that are the voltage detection targets of the monitoring IC 12. In an aspect, electric power is supplied from the battery cells included in the two battery modules.

  Next, connection abnormality determination processing by the battery monitoring apparatus 1 according to the present embodiment will be described.

  FIG. 8 is a flowchart conceptually showing an example of the connection abnormality determination process by the battery monitoring apparatus 1 according to the present embodiment. FIG. 8A is a flowchart conceptually showing an example of connection abnormality determination processing by the battery ECU 20 (microcomputer 22). FIG. 8B is a flowchart conceptually showing an example of the operation of the monitoring IC 12 corresponding to the connection abnormality determination process by the battery ECU 20 (microcomputer 22).

  The flowchart is started when the vehicle is ignited (IG-ON). Further, when the ignition of the vehicle is turned off, the battery ECU 20 (microcomputer 22) shuts off the SMR 25 (OFF). That is, at the start of the flowchart, the SMR 25 is in a blocked (OFF) state. Further, it is assumed that the movable contact MC of the changeover switch 128 is connected to the fixed contact c1 at the start of the flowchart.

  In step S201, the microcomputer 22 transmits a standby command to the monitoring IC 12 (12-1 to 12-9).

  In step S251, the monitoring ICs 12 (12-1 to 12-9) shift to a standby state (a state in which the voltages of the battery cells C1 to C54 can be detected) in response to a standby command from the microcomputer 22.

  In step S202, the microcomputer 22 determines the voltage of three battery cells on the low potential side (battery cells included in the battery module on the low potential side) among the six battery cells that are the voltage detection targets of the monitoring IC 12. A command (voltage output command) instructing to detect and transmit is transmitted to the monitoring IC 12.

  The microcomputer 22 starts counting the internal timer when the voltage output command is transmitted.

  In step S <b> 252, the monitoring IC 12 transmits to the microcomputer 22 a communication frame (voltage output frame) including detection signals corresponding to the voltages of the three battery cells on the low potential side in response to the voltage output command from the microcomputer 22. To do.

  In step S203, the microcomputer 22 determines whether or not a communication frame (voltage output frame) including a detection signal corresponding to the voltages of the three battery cells on the low potential side has been received from the monitoring IC 12. When the microcomputer 22 receives the voltage output frame, the microcomputer 22 proceeds to step S204. When the microcomputer 22 does not receive the voltage output frame, the microcomputer 22 proceeds to step S207.

  In step S204, the microcomputer 22 transmits a command (voltage output command) instructing to detect and transmit the voltages of all the battery cells that are voltage detection targets.

  The microcomputer 22 starts counting the internal timer when the voltage output command is transmitted.

  In step S253, the monitoring IC 12 repeatedly determines whether or not voltage output commands corresponding to all battery cells that are voltage detection targets have been received from the microcomputer 22. When the voltage output command is received, the process proceeds to step S254.

  In step S254, the monitoring IC 12 switches from the state where the movable contact MC of the changeover switch 128 is connected to the fixed contact c1 to the state where it is connected to the fixed contact c2.

  In step S255, the monitoring IC 12 transmits a communication frame (voltage output frame) including detection signals corresponding to the voltages of all the battery cells that are voltage detection targets to the microcomputer 22 and ends the process.

  In step S <b> 205, the microcomputer 22 determines whether a communication frame (voltage output frame) including a detection signal corresponding to the voltage of all the battery cells that are voltage detection targets has been received from the monitoring IC 12. If the microcomputer 22 receives the voltage output frame from the monitoring IC 12, the microcomputer 22 determines that there is no connection abnormality and proceeds to step S206. If the microcomputer 22 does not receive the voltage output frame from the monitoring IC 12, the process proceeds to step S209.

  In step S206, the microcomputer 22 connects (ON) the SMR 25 and ends the processing of the flowchart. That is, the microcomputer 22 permits the power transfer between the assembled battery 11 and the load (motor 50, generator 60, motor inverter 70, generator inverter 80).

  On the other hand, in step S207, the microcomputer 22 determines whether or not the count value of the internal timer is equal to or greater than the predetermined value α2. If the count value is not greater than or equal to the predetermined value α2, the microcomputer 22 returns to step S203 and repeats the processing of steps S203 and S205. If the count value is greater than or equal to the predetermined value α2, the microcomputer 22 proceeds to step S208.

  The predetermined value α2 is a count value corresponding to a time longer than the maximum value of the time expected from the transmission of the voltage output command by the microcomputer 22 to the reception of the voltage output frame.

  In step S208, the microcomputer 22 executes fail-safe processing and ends the processing of the flowchart.

  Note that the content of the fail-safe process is the same as step S60 in FIG. 5 of the first embodiment.

  In step S209, the microcomputer 22 determines whether the count value of the internal timer is equal to or greater than the predetermined value β2. If the count value is not equal to or greater than the predetermined value β2, the microcomputer 22 returns to step S205 and repeats the processes of steps S205 and S209. If the count value is equal to or greater than the predetermined value β2, the microcomputer 22 continuously detects the voltage detected by each monitoring IC 12. Then, it is determined that there is a connection abnormality in any of the two battery modules corresponding to the six battery cells connected in series, and the process proceeds to step S210.

  Note that the predetermined value β2 is the maximum time that is expected from the transmission of the voltage output command corresponding to the voltage of all the battery cells to be detected by the microcomputer 22 to the reception of the voltage output frame corresponding to the voltage output command. This is a count value corresponding to a time longer than the value.

  In step S210, the microcomputer 22 executes connection abnormality notification and diagnosis processing, and continues the state in which the SMR 25 is shut off (OFF) as long as the connection abnormality state continues, and ends the processing of the flowchart. To do.

  The contents of the connection abnormality notification and the diagnosis process are the same as those in step S106 in FIG. 6 of the first embodiment.

  Thus, the battery monitoring apparatus 1 according to the present embodiment transmits a predetermined command (voltage output command) to the monitoring IC 12 in a state where the movable contact MC of the changeover switch 128 is connected to the fixed contact c1. Subsequently, after confirming that the communication frame corresponding to the predetermined command can be received from the monitoring IC 12, the battery monitoring device 1 switches the movable contact MC of the changeover switch 128 to a state in which it is connected to the fixed contact c <b> 2. A predetermined command (voltage output command) is transmitted. When the battery monitoring device 1 can receive a communication frame corresponding to the predetermined command from the monitoring IC 12, the battery monitoring device 1 determines that there is no connection abnormality. On the other hand, when a communication frame corresponding to the predetermined command cannot be received from the monitoring IC 12, it is determined that there is a connection abnormality. That is, the battery monitoring device 1 is in a state in which power is supplied to the communication circuit 126 without passing through the conductive member that connects the two battery modules corresponding to the six battery cells to be detected by the monitoring IC 12. In the case where communication with the monitoring IC 12 is possible and power is supplied to the communication circuit 126 via the conductive member and communication with the monitoring IC 12 is impossible, it is determined that there is a connection abnormality. To do. As a result, it is possible to more reliably determine the connection abnormality.

  That is, power is supplied from the battery cells included in the two battery modules to the communication circuit 126 without passing through the conductive member connecting the two battery modules corresponding to the six battery cells to be detected by the monitoring IC 12. In the supplied state, it is confirmed whether or not communication with the monitoring IC 12 is possible. As a result, it is possible to confirm whether or not there is a malfunction in the communication circuit 126. Therefore, in a state where communication with the monitoring IC 12 is possible, that is, in a state where there is no functional abnormality in the communication circuit 126, power is supplied to the communication circuit 126 via the conductive member, and communication with the monitoring IC 12 cannot be performed. This definitely indicates that a connection abnormality has occurred. Therefore, the battery monitoring apparatus 1 according to the present embodiment can more reliably determine connection abnormality.

  Note that, as in the first embodiment, the battery monitoring device 1 is connected depending on whether another predetermined function in the monitoring IC 12 is executed instead of the communication function with the battery ECU 20 (microcomputer 22) in the monitoring IC 12. You may determine the presence or absence of abnormality. For example, the presence or absence of a connection abnormality may be determined based on whether or not the voltage detection function of the battery cell in the monitoring IC 12 is executed.

  Further, as in the first embodiment, the battery monitoring device 1 specifies the location where the connection abnormality has occurred (the conductive member CBL1) by specifying which monitoring IC 12 connected in a daisy chain is not executed. ~ Any of CBL17) may be specified. For example, in the case of the configuration of the present embodiment, by executing the process according to the flowchart of FIG. Specifically, the microcomputer 22 sequentially executes the processing according to the flowchart of FIG. In the process, if there is no response to the voltage output command (step S204) for all the battery cells to be detected by the voltage transmitted from the microcomputer 22, the microcomputer 22 has six response detection targets of the monitoring IC 12 having no response. It can be determined that there is a connection abnormality between the two battery modules corresponding to the battery cells.

[Modification]
Next, a modification of the second embodiment will be described.

  FIG. 9 is a block diagram showing an example of the configuration of the monitoring IC 12 according to this modification.

  Since all the configurations of the monitoring ICs 12 (12-1 to 12-9) are the same, the configuration of the monitoring IC 12-2 is illustrated in FIG.

  In the configuration of the monitoring IC 12 according to this modification, a different part from the second embodiment described above is that the changeover switch 128 in the monitoring IC 12 is mounted as the switch module 23 outside the monitoring IC 12.

  The switch module 23 has the same function as that of the changeover switch 128 in the second embodiment, and switches the power supply path to the power supply 127 according to a control command from the battery ECU 20 (microcomputer 22).

  By adopting such a configuration, the battery monitoring device 1 according to the present modification can execute a connection abnormality determination process similar to that of the second embodiment.

  FIG. 10 is a flowchart conceptually showing an example of the connection abnormality determination process by the battery monitoring apparatus 1 (battery ECU 20) according to this modification.

  The part different from the flowchart of FIG. 8A of the second embodiment is only step S304, and steps S301 to S303 and steps S305 to S311 are steps S201 to S203 and step S204 in FIG. To S210. That is, in step S304, the microcomputer 22 starts from the state in which the movable contact MC of the switch module 23 is connected to the fixed contact c1, as in step S254 (processing by the monitoring IC 12) in FIG. 8B of the second embodiment. Switch to the state of connection to the fixed contact c2.

  Thus, the battery monitoring apparatus 1 according to the present modification can obtain the same operations and effects as those of the second embodiment.

  As mentioned above, although the form for implementing this invention was explained in full detail, this invention is not limited to this specific embodiment, In the range of the summary of this invention described in the claim, various Can be modified or changed.

  In addition, the battery monitoring device according to the above-described embodiment is a unit included in an assembled battery mounted on an electric vehicle (range extender vehicle, electric vehicle using only a motor as a driving force source) other than a series / parallel hybrid vehicle. The present invention may be applied to battery status monitoring.

  In addition, the battery monitoring device according to the above-described embodiment may be applied to state monitoring of an assembled battery other than a vehicle (for example, an assembled battery in a stationary power storage device).

DESCRIPTION OF SYMBOLS 1 Battery monitoring apparatus 2 Battery pack 10 Battery unit 11 Assembly battery 12, 12-1 to 12-9 Monitoring IC (battery monitoring IC)
20 Battery ECU
21 Isolator 22 Microcomputer (monitoring unit, connection abnormality determination unit)
23 Switch module (power switching unit)
30 HV-ECU
40 Engine 50 Motor 60 Generator 70 Motor Inverter 80 Generator Inverter 121 Voltage Detector 122 Higher Communication Circuit 123 Lower Communication Circuit (Operating Circuit Unit)
124 Upper communication power supply 125 Lower communication power supply 126 Communication circuit (operation circuit part)
127 power supply 128 changeover switch (power changeover unit)
C1-C54 battery cell (unit battery)
MOD1 to MOD18 Battery module V + Positive terminal V- Negative terminal

Claims (4)

A battery pack composed of a plurality of unit cells connected in series, and among the plurality of unit cells, a plurality of battery modules composed of two or more unit cells connected in series are connected in series with conductive members, respectively. An assembled battery,
A battery monitoring IC that detects a voltage of each unit battery continuously connected across at least two battery modules included in the plurality of battery modules among the plurality of unit batteries;
A monitoring unit that monitors the states of the plurality of unit batteries based on the voltage detected by the battery monitoring IC;
Of the at least two battery modules, the first electric power supplied from the unit cells included in the two continuous battery modules in a mode of passing through the conductive member connecting the two continuous battery modules. An operation circuit unit that operates according to a predetermined function in the battery monitoring IC; and
When the predetermined function is not executed, a connection abnormality determination unit that determines that there is a connection abnormality in the conductive member that connects the two continuous battery modules,
Battery monitoring device. Supplied from the unit battery included in the two continuous battery modules in a mode not passing through the conductive member connecting the first power and the two continuous battery modules to the operating circuit unit A power switching unit that switches to supply any one of the second power
The connection abnormality determination unit
The predetermined function is executed in a state in which the second power is switched to be supplied to the operating circuit unit by the power switching unit, and the first power is supplied to the operating circuit by the power switching unit. When the predetermined function is not executed in a state where it is switched to be supplied to the unit, it is determined that there is a connection abnormality in the conductive member that connects the two continuous battery modules.
The battery monitoring apparatus according to claim 1. The predetermined function is:
A communication function for communicating with the outside of the battery monitoring IC;
The battery monitoring apparatus according to claim 1 or 2. The assembled battery is
Connected to a predetermined load via a relay that switches between connected and disconnected states,
The connection abnormality determination unit
When the relay is in a disconnected state, the presence or absence of the connection abnormality is determined, and when it is determined that the connection abnormality is present, the relay is continuously maintained in the disconnected state.
The battery monitoring apparatus according to any one of claims 1 to 3.

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