JP2016059137A - Charge/discharge control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge/discharge control device which surely detects an abnormality in a main monitoring function for a voltage of a power storage part and, even when any abnormality occurs in a monitoring part, continues charge/discharge of the power storage part.SOLUTION: The charge/discharge control device includes: a plurality of connected battery cells; one high-precision ADC for detecting voltages of the battery cells; another low-precision ADC for detecting voltages of the battery cells; a stack voltage detection part for detecting a voltage of each of battery stacks which are configured by dividing the plurality of battery cells; and a control part which executes charge/discharge control of the plurality of battery cells in such a manner that an SOC of each battery cell based on the voltage of each battery cell detected by the one ADC is settled within a first predetermined range. If it is determined that any abnormality occurs in either the one ADC or the other ADC, on the basis of the voltages of the battery stacks detected by the stack voltage detection part, the control part discriminates the presence/absence of an abnormality in one ADC on the basis of the voltage of each of the battery stacks detected by the stack voltage detection part and executes the charge/discharge control of the plurality of battery cells in such a manner that the SOC of each battery cell is settled within a second predetermined range which is narrower than the first predetermined range.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a charge / discharge control apparatus that performs charge / discharge control of a power storage unit while monitoring the voltage of the power storage unit.

  Conventionally, a first monitoring unit that monitors a state (voltage) of a battery cell (power storage unit) and a first monitoring unit that replaces the first monitoring unit when the first monitoring unit diagnoses itself as abnormal by self-diagnosis. An electric power storage device including two monitoring units is known (for example, Patent Document 1).

  Thus, by providing the second monitoring unit, even when an abnormality occurs in the first monitoring unit, the second monitoring unit can continue to monitor the voltage of the power storage unit, Based on the monitoring result by the second monitoring unit, charging and discharging of the power storage unit can be continued.

JP 2013-162635 A

  However, in Patent Document 1, the second monitoring unit has a monitoring function (for example, a high-resolution AD converter) equivalent to the first monitoring unit, and the first monitoring unit executes its own abnormality diagnosis A self-diagnosis circuit and the like. As a result, the overall circuit scale and cost may increase.

  Therefore, in view of the above problem, even when the abnormality of the main monitoring function of the voltage of the power storage unit is reliably detected and the abnormality of the monitoring function is detected while suppressing an increase in circuit scale and cost, the power storage unit It aims at providing the charging / discharging control apparatus which can continue charging / discharging of.

In order to solve the above problem, in one embodiment, the charge / discharge control device comprises:
A plurality of connected power storage units;
A first voltage detection unit for detecting a voltage of each of the plurality of power storage units;
A second voltage detection unit that detects a voltage of each of the plurality of power storage units, the second voltage detection unit having lower detection accuracy than the first voltage detection unit;
A third voltage detector that detects a voltage of a predetermined circuit part that can be calculated based on the voltages of each of the plurality of power storage units;
The state of charge of each of the plurality of power storage units based on the voltage of each of the plurality of power storage units detected by the first voltage detection unit or the voltage of each of the plurality of power storage units detected by the first voltage detection unit Is provided with a control unit that performs charge / discharge control of the plurality of power storage units, so as to fall within the first predetermined range,
The controller is
Based on a comparison of the voltages of the plurality of power storage units detected by the first voltage detection unit and the second voltage detection unit, an abnormality has occurred in either the first voltage detection unit or the second voltage detection unit. And determining whether or not there is an abnormality in the first voltage detection unit based on the voltage of the predetermined circuit part detected by the third voltage detection unit, and determining whether or not the first voltage detection unit is abnormal. If detected, the plurality of power storages based on the voltages of the plurality of power storage units detected by the second voltage detection unit or the voltages of the plurality of power storage units detected by the second voltage detection unit. Charging / discharging control of the plurality of power storage units is performed such that a state of charge of the unit falls within a second predetermined range narrower than the first predetermined range.

In another embodiment, the charge / discharge control device
A plurality of connected power storage units;
A first voltage detection unit for detecting a voltage of each of the plurality of power storage units;
A second voltage detection unit that detects a voltage of a predetermined circuit portion that can be calculated based on the voltages of each of the plurality of power storage units;
A third voltage detection unit that detects a voltage of each of the plurality of power storage units and a voltage of a predetermined other circuit part that can be calculated based on a voltage of the predetermined one circuit part;
The state of charge of each of the plurality of power storage units based on the voltage of each of the plurality of power storage units detected by the first voltage detection unit or the voltage of each of the plurality of power storage units detected by the first voltage detection unit Is provided with a control unit that performs charge / discharge control of the plurality of power storage units, so as to fall within the first predetermined range,
The controller is
The voltage of the predetermined circuit portion calculated based on the voltages of the plurality of power storage units detected by the first voltage detection unit and the predetermined circuit portion detected by the second voltage detection unit The predetermined other circuit portion detected by the third voltage detector when it is determined that an abnormality has occurred in either the first voltage detector or the second voltage detector based on the comparison of the voltages of And determining whether there is an abnormality in the first voltage detection unit, and detecting an abnormality in the first voltage detection unit, wherein the degree of abnormality in the first voltage detection unit is not more than a predetermined level. The plurality of power storage units based on the voltages of the plurality of power storage units detected by the first voltage detection unit or the voltages of the plurality of power storage units detected by the first voltage detection unit. The charging state is narrower than the first predetermined range. To fit in a predetermined range, and executes the charging and discharging control of the plurality of power storage units.

  According to the above embodiment, the main monitoring function abnormality of the power storage unit voltage is reliably detected while suppressing an increase in circuit scale and cost, and charging of the power storage unit can be performed even when the monitoring unit has an abnormality. It is possible to provide a charge / discharge control apparatus capable of continuing discharge.

It is a block diagram which shows an example of a structure of the vehicle containing the charging / discharging control apparatus which concerns on this embodiment. It is a block diagram which shows an example of a structure of the battery pack contained in the charging / discharging control apparatus which concerns on this embodiment. It is a block diagram which shows an example of a structure of monitoring IC. It is a figure explaining an example of the charging / discharging control method by a charging / discharging control apparatus (HV-ECU). It is a flowchart which shows an example of the abnormality detection process of monitoring IC by a charging / discharging control apparatus (battery ECU, HV-ECU).

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

  FIG. 1 is a block diagram illustrating an example of a configuration of a vehicle 100 including a charge / discharge control device 1 according to the present embodiment. FIG. 2 is a block diagram showing a configuration of the battery pack 2 included in the charge / discharge control device 1 according to the present embodiment. In FIG. 1, 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 charge / discharge control device 1 is mounted on a vehicle 100 as a series / parallel hybrid vehicle, and is configured to be able to supply electric power to a motor 50 that is one of driving force sources of the vehicle 100 (battery cell). C1 to C56) charge / discharge control is executed.

  The battery unit 10 (battery cells C1 to C56) is discharged by supplying electric power (three-phase alternating current) to the motor 50 via the motor inverter 70. Further, in the battery unit 10 (battery cells C1 to C56), electric power generated by the generator 60 (three-phase alternating current) using the engine 40, which is one of the driving power sources of the vehicle 100, as a power source passes through the generator inverter 80. It is charged by being supplied as DC power. The battery unit 10 (battery cells C <b> 1 to C <b> 56) is supplied with regenerative power (three-phase AC) by the motor 50 functioning as a generator when the vehicle 100 is decelerated as DC power via the motor inverter 70. Charged.

  The charge / discharge control device 1 includes a battery unit 10 included in the battery pack 2, a battery ECU (Electric Control Unit) 20, and an HV-ECU 30.

  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 battery cells C1 to C56, a monitoring IC 11, a service plug SP, and the like.

  The battery cells C1 to C56 are 56 power storage units, and each of the battery cells C1 to C56 may be a unit cell of a lithium ion battery, for example. The battery cells C1 to C56 are all connected in series, and the entire battery unit 10 is connected between the positive terminal V + extending from the positive electrode of the battery cell C1 and the negative terminal V− extending from the negative electrode of the battery cell C56. The output voltage (for example, about 300V) can be taken out.

  The battery cells C1 to C56 may have any configuration as long as they are chargeable / dischargeable power storage units, and may be other secondary batteries (such as nickel metal hydride batteries) or capacitors. Further, the number of battery cells (56) included in the battery unit 10 is an example, and may be an arbitrary number. Moreover, although the battery cells C1-C56 are connected in series, parallel connection (for example, 2 parallel 28 series arrangement | positioning etc.) may be sufficient.

  The monitoring IC 11 is voltage detection means that detects the voltages of the battery cells C1 to C56. The monitoring IC 11 includes 14 monitoring ICs 11-1 to 11-14, and each monitoring IC 11-1 to 11-14 is configured to be able to detect the voltages of four battery cells. That is, each of the 14 monitoring ICs 11-1 to 11-14 monitors (detects) the voltages of the four battery cells to be monitored, so that the monitoring IC 11 detects all the voltages of the battery cells C1 to C56. It is configured to be able to perform monitoring (detection).

  Note that the number (4) of battery cells to be monitored by each monitoring IC 11-1 to 11-14 is an example, and is set to an arbitrary number according to other requirements such as the size of the monitoring IC 11. Good.

  FIG. 3 is a block diagram illustrating an example of the configuration of the monitoring IC 11 (11-1 to 11-14).

  Since the monitoring ICs 11-1 to 11-14 all have the same configuration, FIG. 3 shows a configuration example of the monitoring IC 11-1 as a representative. In FIG. 3, an inter-cell voltage equalizing circuit for equalizing the voltages of the battery cells C1 to C56 is omitted for simplicity.

  Referring to FIG. 3, the monitoring IC 11-1 includes a power supply circuit 12, AD converters (ADC) 13, 14, and the like.

  Hereinafter, the power supply circuit 12 included in the monitoring IC 11-1 is referred to as a power supply circuit 12-1, and the same rule (the power supply circuit 12) is applied to the power supply circuits 12 included in the other monitoring ICs 11-2 to 11-14. -2 to 12-14).

  The power supply circuit 12-1 is an electronic circuit that generates a power supply in the monitoring IC 11-1 from the power supplied from the four battery cells C1 to C4 to be monitored by the monitoring IC 11-1. The power supply voltage Vcc generated by the power supply circuit 12-1 is supplied to the ADCs 13 and 14 in the monitoring IC 11-1.

  The ADC 13 includes four ADCs 13-1 to 13-4. Each ADC 13-1 to 13-4 uses the reference voltage to convert the input voltage of each of the battery cells C1 to C4 (corresponding analog signal) into a digital signal corresponding to the voltage, and a battery ECU 20 (described later). Output to the microcomputer 23). The microcomputer 23 can calculate the voltages of the battery cells C1 to C4 from the digital signals corresponding to the input voltages of the battery cells C1 to C4. The ADCs 13-1 to 13-4 It functions as a voltage detection unit for the cells C1 to C4.

  The ADC 13 includes ADCs 13-5 to 13-56 that convert the voltages of the remaining battery cells C5 to C56 into corresponding digital signals. The ADCs 13-5 to 13-56 are arranged in four in order, the monitoring IC 11- It arrange | positions so that it may be contained in each of 2-11-14.

  The ADC 14 includes four ADCs 14-1 to 14-4. Each ADC 14-1 to 14-4 uses the reference voltage to convert the input voltage of each of the battery cells C1 to C4 (an analog signal corresponding thereto) into a digital signal corresponding to the voltage, and the battery ECU 20 (microcomputer) 23). The microcomputer 23 can calculate the voltages of the battery cells C1 to C4 from the digital signals corresponding to the input voltages of the battery cells C1 to C4. The ADCs 14-1 to 14-4 It functions as a voltage detection unit for the cells C1 to C4.

  The ADC 14 includes ADCs 14-5 to 14-56 that convert the voltages of the remaining battery cells C5 to C56 into corresponding digital signals, like the ADC 13, and the ADCs 14-5 to 14-56 are four in order. The monitoring ICs 11-2 to 11-14 are included in each of the monitoring ICs 11-2 to 11-14.

  Here, the ADC 13 (13-1 to 13-56) has, for example, a relatively high resolution of 14 to 18 bits and is configured to detect the voltages of the battery cells C1 to C56 with relatively high accuracy. .

  On the other hand, the ADC 14 (14-1 to 14-56) has, for example, 10-bit resolution, and can detect the voltages of the battery cells C1 to C56 with lower accuracy than the ADC 13 (13-1 to 13-56). Configured.

  Each of the four ADCs 13 and 14 included in each of the monitoring ICs 11-1 to 11-14 is replaced by a multiplexer that converts the voltage of each battery cell into one system time-series signal and one ADC. Also good.

  Returning to FIG. 2, the monitoring ICs 11-1 to 11-7 are connected so as to be capable of bidirectional communication via the communication line 15, and the monitoring IC 11-7 is capable of bidirectional communication with the battery ECU 20 (microcomputer 23). Connected. That is, the battery ECU 20 (microcomputer 23) and the monitoring ICs 11-1 to 11-7 are connected in a daisy chain, and output signals from the ADCs 13-1 to 13-28, the ADCs 14-1 to 14-28, and the like are monitored ICs 11-7. To the battery ECU 20 (microcomputer 23).

  Similarly, the monitoring ICs 11-8 to 11-14 are connected so as to be capable of bidirectional communication via the communication line 16, and the monitoring ICs 11-14 are connected so as to be capable of bidirectional communication with the battery ECU 20 (microcomputer 23). The That is, the battery ECU 20 (microcomputer 23) and the monitoring ICs 11-8 to 11-14 are connected in a daisy chain, and output signals from the ADCs 13-29 to 13-56, the ADCs 14-29 to 14-56 and the like are monitored ICs 11-14. To the battery ECU 20 (microcomputer 23).

  The service plug SP is provided on a connection line at an intermediate position (between the battery cell C28 and the battery cell C29) of the battery cells C1 to C56 connected in series, and the connection of the battery cells C1 to C56 can be cut off by being removed. Configured to be possible. Thereby, the safety | security in the inspection operation etc. of the battery unit 10 is securable. In the present embodiment, battery cells C1 to C56 connected in series are batteries including battery cells C29 to C56 connected in series with a battery stack ST1 including battery cells C1 to C28 connected in series with the service plug SP as a boundary. It is divided into a stack ST2.

  Note that the number (two) of battery stacks is an example, and the battery cells C1 to C56 connected in series may be divided into more battery stacks.

  The battery ECU 20 is an electronic control unit that monitors the battery unit 10 (battery cells C1 to C56), and is calculated based on output signals from the monitoring results (ADCs 13-1 to 13-56, 14-1 to 14-56). The voltage of the battery cells C1 to C56) is transmitted to the HV-ECU 30. The battery ECU 20 includes a stack voltage detection unit 21, an isolator 22, a microcomputer 23, and the like.

  The stack voltage detection unit 21 is a voltage detection unit that detects voltages of the battery stack ST1 (battery cells C1 to C28 connected in series) and the battery stack ST2 (battery cells C29 to C56 connected in series). Stack voltage detection units 21-1 and 21-2 corresponding to battery stacks ST1 and ST2 are included. Each of the stack voltage detection units 21-1 and 21-2 transmits a digital signal corresponding to the detected voltage of the battery stacks ST1 and ST2 to the microcomputer 23. In addition to the detection of the voltages of the battery cells C1 to C56 by the ADC 13, by detecting the voltages of the battery stacks ST1 and ST2 including the battery cells C1 to C56 by the stack voltage detection unit 21, the battery cells C1 to C56 Duplication of overvoltage (overcharge) determination can be achieved. Even when communication between the monitoring IC 11 and the battery ECU 20 (microcomputer 23) becomes impossible, the microcomputer 23 uses the voltages of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21. Thus, the voltage of the entire battery unit 10 can be detected.

  The stack voltage detection units 21-1 and 21-2 have a function of realizing electrical insulation between the battery stacks ST1 and ST2 belonging to the high voltage system and the microcomputer 23 belonging to the low voltage system. It may be an amplifier or the like.

  The isolator 22 achieves electrical insulation between the battery unit 10 belonging to the high voltage system and the microcomputer 23 belonging to the low voltage system, and between the monitoring ICs 11-7 and 11-14 in the battery unit 10 and the microcomputer 23. It is a known isolated interface that allows for communication. The isolator 22 includes isolators 22-1 and 22-2 corresponding to the monitoring ICs 11-7 and 11-14.

  The microcomputer 23 executes various arithmetic processes by executing various programs stored in the ROM on the CPU based on the output signals transmitted from the monitoring IC 11, the stack voltage detecting unit 21, and the like.

  The microcomputer 23 calculates the voltage of the battery cells C1 to C56 based on the output signal from the monitoring IC 11 (ADCs 13 and 14) (digital signal corresponding to the voltage of the battery cells C1 to C56). Further, the microcomputer 23 calculates the voltages of the battery stacks ST1 and ST2 based on the output signals (digital signals corresponding to the voltages of the battery stacks ST1 and ST2) of the stack voltage detection unit 21 (21-1 and 21-2). . The battery ECU 20 and the HV-ECU 30 are communicably connected via an in-vehicle LAN or the like, and the microcomputer 23 sends information such as the calculated voltages of the battery cells C1 to C56 and the voltages of the battery stacks ST1 and ST2 to the HV-ECU 30. Send to.

  Further, the microcomputer 23 executes an abnormality detection process of the monitoring function (the voltage detection function of the battery cells C1 to C56 by the ADCs 13 and 14) by the monitoring IC 11 (11-1 to 11-14). The microcomputer 23 transmits the result of the abnormality detection process (whether or not the ADCs 13 and 14 are abnormal) to the HV-ECU 30. Specific contents of the abnormality detection process by the microcomputer 23 will be described later.

  The HV-ECU 30 is an electronic control unit that performs charge / discharge control of the battery unit 10 (battery cells C1 to C56). The HV-ECU 30 may be constituted 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 is based on the voltage of the battery cells C1 to C56 transmitted from the battery ECU 20 (microcomputer 23) so that the state of charge (State of Charge (SOC)) is within a predetermined range determined by the upper limit value and the lower limit value. Charge / discharge control of the battery cells C1 to C56 is executed. The HV-ECU 30 is configured to be able to control the engine 40, the motor 50, and the generator 60, and controls the engine 40, the motor 50, and the generator 60 according to the traveling state of the vehicle 100, the operation by the driver, and the like. Thus, charge / discharge control of the battery unit 10 (battery cells C1 to C56) is executed.

  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.

  Here, charge / discharge control of the battery unit 10 (battery cells C1 to C56) by the charge / discharge control device 1 will be described separately for a normal time (when the ADC 13 is normal) and an abnormal time (when the ADC 13 is abnormal).

  FIG. 4 is a diagram for explaining an example of a charge / discharge control method of the battery unit 10 (battery cells C1 to C56) by the charge / discharge control device 1 (HV-ECU 30). Specifically, the horizontal axis represents each battery cell. It is a graph which makes SOC of C1-C56 and makes a vertical axis | shaft the voltage of each battery cell C1-C56. Note that the SOC of each of the battery cells C1 to C56 on the horizontal axis is displayed as a charging rate (0% to 100%), the origin is set to 100%, and the SOC is displayed so as to approach 0% as it moves away from the origin (goes to the right). Has been.

  For each of the battery cells C1 to C56, for example, an allowable range of SOC is set from the viewpoint of suppressing deterioration and improving the fuel consumption by improving the acceptability of regenerative power when the vehicle 100 is decelerated. As shown in FIG. 4, in this example, the allowable SOC range SR between the lower limit value S1 and the upper limit value S2 is set as the allowable range of the SOC of each of the battery cells C1 to C56.

  As shown in FIG. 4, there is a known correlation between the SOC and the voltage of each battery cell C1 to C56, the lower limit value S1 corresponds to the lower limit value V1 of the voltage, and the upper limit value S2 is the upper limit of the voltage. Corresponds to the value V2. That is, the allowable SOC range SR (lower limit value S1 to upper limit value S2) of each battery cell C1 to C56 can be replaced with the allowable voltage range VR (lower limit value V1 to upper limit value V2) of each battery cell C1 to C56.

  First, the HV-ECU 30 normally sets the SOC of each battery cell C1 to C56 within the allowable SOC range SR based on the voltage of each battery cell C1 to C56 detected by the ADC 13 (13-1 to 13-56). Charge / discharge control is performed so as to fit. At this time, the HV-ECU 30 performs charge / discharge control in consideration of detection accuracy (variation) of the ADC 13 (13-1 to 13-56). Specifically, as shown in FIG. 4, a lower limit value V3 corresponding to a value obtained by adding the detection error (variation) of the ADC 13 to the lower limit value V1, and a detection error (variation) of the ADC 13 is subtracted from the upper limit value V2. Charge / discharge control of the battery cells C1 to C56 is executed so that the voltage of each of the battery cells C1 to C56 detected by the ADC 13 falls within the control voltage range VR1 between the upper limit value V4 corresponding to the above. In other words, the HV-ECU 30 determines that the SOC of each of the battery cells C1 to C56 based on the voltage of each of the battery cells C1 to C56 detected by the ADC 13 corresponds to the lower limit value S3 (corresponding to the lower limit value V3 of the voltage), The charge / discharge control of the battery cells C1 to C56 is executed so as to be within the control SOC range SR1 between the upper limit value S4 (corresponding to the upper limit value V4).

  The “voltages of the battery cells C1 to C56 detected by the ADC 13” are the battery cells C1 to C1 calculated by the microcomputer 23 based on digital signals corresponding to the voltages of the battery cells C1 to C56 output from the ADC 13. It means the voltage of C56.

  On the other hand, when the abnormality of the ADC 13 is detected by the battery ECU 20 (the microcomputer 23), the HV-ECU 30 determines whether each battery is based on the voltage of each battery cell C1 to C56 detected by the ADC 14 (14-1 to 14-56). Charge / discharge control is performed so that the SOCs of the cells C1 to C56 fall within the allowable SOC range SR. At this time, the HV-ECU 30 executes charge / discharge control in consideration of the detection accuracy (variation) of the ADC 14 (14-1 to 14-56). Specifically, as shown in FIG. 4, a lower limit value V5 corresponding to the addition of the detection error (variation) of the ADC 14 to the lower limit value V1 and the detection error (variation) of the ADC 14 are subtracted from the upper limit value V2. Charge / discharge control of the battery cells C1 to C56 is executed so that the voltage of each of the battery cells C1 to C56 detected by the ADC 14 falls within the control voltage range VR2 between the upper limit value V6 corresponding to the above. In other words, the HV-ECU 30 determines that the SOC of each of the battery cells C1 to C56 based on the voltage of each of the battery cells C1 to C56 detected by the ADC 14 corresponds to the lower limit value S5 (corresponding to the lower limit value V5 of the voltage), The charge / discharge control of the battery cells C1 to C56 is executed so as to be within the control SOC range SR2 between the upper limit value S6 (corresponding to the upper limit value V6).

  The “voltages of the battery cells C1 to C56 detected by the ADC 14” are the battery cells C1 to C1 calculated by the microcomputer 23 based on digital signals corresponding to the voltages of the battery cells C1 to C56 output from the ADC 14. It means the voltage of C56.

  As described above, since the ADC 14 has lower voltage detection accuracy than the ADC 13, the control voltage range VR2 and the control SOC range SR2 are narrower than the control voltage range VR1 and the control SOC range SR1. That is, when an abnormality is detected in the ADC 13, the HV-ECU 30 limits the range for controlling the voltage (SOC) of the battery cells C <b> 1 to C <b> 56 according to the detection accuracy of the ADC 14, and then detects the ADC 14. The charge / discharge control of the battery cells C1 to C56 based on the voltages of the battery cells C1 to C56 is continued.

  Thus, even if abnormality occurs in ADC13 which performs the main monitoring function of battery cell C1-C56, charge / discharge control apparatus 1 concerning this embodiment uses battery unit 10 (battery cells C1-C56) using ADC14. ) Charging / discharging control can be continued. Therefore, the fuel consumption deterioration of the vehicle 100 due to the charge / discharge stop of the battery unit 10 (battery cells C1 to C56) can be prevented.

  In addition, since the ADC 14 has a lower resolution (lower detection accuracy) than the ADC 13, it is necessary to limit the range for controlling the voltage (SOC) of the battery cells C <b> 1 to C <b> 56 in the charge / discharge control, but the charge / discharge control device 1. The increase in circuit scale and cost can be suppressed.

  That is, the charge / discharge control device 1 according to the present embodiment suppresses an increase in circuit scale and cost, and even when an abnormality occurs in the main monitoring function of the battery cells C1 to C56, the battery cells C1 to C56. Charging and discharging can be continued.

  Note that the functions of the battery ECU 20 and the HV-ECU 30 may be realized by arbitrary hardware, software, firmware, or a combination thereof. Further, some or all of the functions of the battery ECU 20 and the HV-ECU 30 may be realized by another ECU. Moreover, the battery ECU 20 and the HV-ECU 30 may realize part or all of the functions of other ECUs. For example, some or all of the functions of the HV-ECU 30 may be realized by the battery ECU 20 (the microcomputer 23).

  Next, abnormality detection processing of the monitoring IC 11 (ADCs 13 and 14) by the charge / discharge control device 1 (battery ECU 20, HV-ECU 30) will be described.

  FIG. 5 is a flowchart illustrating an example of an abnormality detection process of the monitoring IC 11 (ADCs 13 and 14) by the charge / discharge control device 1 (battery ECU 20, HV-ECU 30). The flowchart is repeatedly executed at predetermined time intervals when the vehicle 100 is in an activated state (ignition on state).

  Note that the voltage of each battery cell Ci (i = 1 to 56) detected by the ADC 13 is VMi (i = 1 to 56), and the voltage of each battery cell Ci (i = 1 to 56) detected by the ADC 14 is It is assumed that VSi (i = 1 to 56). Further, the voltage of the battery stack STj (j = 1, 2) detected by the stack voltage detection unit 21 is defined as VSTj (j = 1, 2). Further, in the flowchart, when an abnormality is detected in the ADC 13 or the ADC 14, the abnormality detection process in the subsequent flowchart may be skipped until repair or parts replacement is performed at a dealer or the like.

  First, in steps S <b> 101 to S <b> 102, the microcomputer 23 executes preprocessing for detecting an abnormality of the ADC 13 or the ADC 14.

  In step S101, the microcomputer 23 reads the voltages (VM1 to VM56, VS1 to VS56) of the battery cells C1 to C56 detected by the ADCs 13 and 14 from the internal memory.

  In step S102, the microcomputer 23 sets the counter value i to “0”.

  Subsequently, in steps S <b> 103 to S <b> 105, the microcomputer 23 executes processing for determining whether or not an abnormality has occurred in either the ADC 13 or the ADC 14.

  In step S103, the microcomputer 23 increments the counter value i.

  In step S <b> 104, the microcomputer 23 determines whether or not the counter value i is equal to or less than the number n (in this embodiment, n = 56) of battery cells included in the battery unit 10. If the counter value i is less than or equal to the number n of battery cells, the process proceeds to step S105. If the counter value i is not less than or equal to the number n of battery cells, that is, greater than the number n of battery cells, the current process is terminated.

  In step S105, the microcomputer 23 determines whether or not the difference between the voltage VMi of the battery cell Ci detected by the ADC 13 and the voltage VSi of the battery cell Ci detected by the ADC 14 is smaller than the first threshold value Vth1. When the difference between the voltage VMi of the battery cell Ci detected by the ADC 13 and the voltage VSi of the battery cell Ci detected by the ADC 14 is smaller than the first threshold value Vth1, the process returns to step S103, that is, not smaller than the first threshold value Vth1. If it is greater than or equal to one threshold Vth1, the process proceeds to step S106.

  As described above, in steps S103 to S105, the microcomputer 23 increments the counter value i from 1 to n (= 56), and the battery cell Ci detected by the ADC 14 and the voltage VMi of the battery cell Ci detected by the ADC 13. It is repeatedly determined whether or not the difference of the Ci voltage VSi is smaller than the first threshold value Vth1. When the difference between the voltage VMi of the battery cell Ci detected by the ADC 13 and the voltage VSi of the battery cell Ci detected by the ADC 14 is equal to or greater than the first threshold value Vth1, the microcomputer 23 causes an abnormality in the ADC 13 or the ADC 14. It judges that it exists, and the process after step S106 is performed.

  When the ADC 13 and the ADC 14 are both normal, the voltage VMi of the battery cell Ci detected by the ADC 13 and the voltage VSi of the battery cell Ci detected by the ADC 14 are substantially equal (only a difference due to a difference in detection accuracy). Not). Therefore, when the difference between the voltage VMi of the battery cell Ci detected by the ADC 13 and the voltage VSi of the battery cell Ci detected by the ADC 14 is equal to or greater than a difference (first threshold Vth1) assumed due to the difference in detection accuracy, It can be determined that an abnormality has occurred in the ADC 13 or the ADC 14.

  Subsequently, in steps S106 to S107, the microcomputer 23 executes preprocessing for specifying which of the ADC 13 and the ADC 14 is abnormal.

  In step S106, the microcomputer 23 reads the voltages VST1 and VST2 of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 from the internal memory.

  In step S107, the microcomputer 23 sets the counter value j to “0”.

  Subsequently, in steps S <b> 108 to S <b> 111, the microcomputer 23 executes a process for specifying which of the ADC 13 and the ADC 14 is abnormal.

  In step S108, the microcomputer 23 increments the counter value j.

  In step S109, the microcomputer 23 determines whether or not the counter value j is equal to or less than the number m of battery stacks included in the battery unit 10 (m = 2 in the present embodiment). If the counter value j is less than or equal to the number m of battery stacks, the process proceeds to step S110, and if it is not less than or equal to the number m of battery stacks, that is, greater than the number m of battery stacks, the current process is terminated.

  In step S110, the microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the sum ΣVMi of the voltage VMi of the battery cell Ci included in the battery stack STj detected by the ADC 13 is the same. It is determined whether or not it is smaller than the second threshold value Vth2. In other words, the microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage of the battery stack STj calculated based on the voltage VMi of the battery cell Ci detected by the ADC 13 is the first. It is determined whether or not it is smaller than 2 threshold value Vth2. If the determination condition is satisfied, the process proceeds to step S111. If the determination condition is not satisfied, the process proceeds to step S112.

  In step S111, the microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the sum ΣVSi of the voltage VSi of the battery cell Ci included in the battery stack STj detected by the ADC 14 is calculated. It is determined whether or not it is smaller than the third threshold value Vth3. In other words, the microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage of the battery stack STj calculated based on the voltage VSi of the battery cell Ci detected by the ADC 14 is the first. It is determined whether it is smaller than 3 threshold value Vth3. If the determination condition is satisfied, the process returns to step S108. If the determination condition is not satisfied, the process proceeds to step S114.

  As described above, in steps S108 to S111, the microcomputer 23 increments the counter value j from 1 to m (= 2), and uses the voltage VSTj of the battery stack STj detected by the stack voltage detection unit 21 and the ADC 13. Whether the difference from the voltage of the battery stack STj calculated based on the detected voltage VMi of the battery cell Ci is smaller than the second threshold value Vth2, and the voltage VSTj of the battery stack STj detected by the stack voltage detection unit 21 And whether the difference between the voltage of the battery stack STj calculated based on the voltage VSi of the battery cell Ci detected by the ADC 14 is smaller than the third threshold value Vth3 is repeatedly determined.

  The microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage of the battery stack STj calculated based on the voltage VMi of the battery cell Ci detected by the ADC 13 is greater than or equal to the second threshold value Vth2. In this case, the abnormality of the ADC 13 is specified (detected), and the processes of steps S112 to S113 are executed.

  On the other hand, the microcomputer 23 determines that the difference between the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage of the battery stack STj calculated based on the voltage VSi of the battery cell Ci detected by the ADC 14 is the third threshold value. In the case of Vth3 or more, the abnormality of the ADC 14 is specified (detected), and the processes of steps S114 to S115 are executed.

  When the ADC 13 is normal, the voltage VSTj of the battery stack STj detected by the stack voltage detection unit 21 and the voltage of the battery stack STj calculated based on the voltage VMi of the battery cell Ci detected by the ADC 13 are substantially equal. (There should be only a difference due to the difference in detection accuracy). The same applies to the case where the ADC 14 is normal. Therefore, the difference in voltage of the battery stack STj calculated based on the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage VMi of the battery cell Ci detected by the ADC 13 is caused by the difference in detection accuracy. If the difference is greater than or equal to the assumed difference (second threshold value Vth2), it can be determined that an abnormality has occurred in the ADC 13. Further, the difference in the voltage of the battery stack STj calculated based on the voltage VSTj of the battery stack STj detected by the stack voltage detector 21 and the voltage VSi of the battery cell Ci detected by the ADC 14 is caused by the difference in detection accuracy. If the difference is greater than or equal to the assumed difference (third threshold value Vth3), it can be determined that an abnormality has occurred in the ADC 14.

  Subsequently, in steps S112 to S113, processing corresponding to the abnormality of the ADC 13 is executed, and in steps S114 to S115, processing corresponding to the abnormality of the ADC 14 is executed.

  In step S <b> 112, the microcomputer 23 displays a warning on display means (not shown) (for example, a meter panel in the vehicle 100) and transmits an abnormality signal indicating that an abnormality has been detected to the ADC 13 to the HV-ECU 30.

  Note that the warning display may be a warning display that specifies that the ADC 13 is abnormal, or may be a warning display that indicates that some abnormality has occurred in the monitoring function of the battery pack 2. The driver of the vehicle 100 only needs to be able to take measures such as bringing it into a dealer in response to the warning display. Further, the microcomputer 23 may issue a voice warning through, for example, a speaker in the vehicle 100 instead of the warning display or in combination with the warning display.

  In step S113, as described above, the HV-ECU 30 determines the battery cells C1 to C56 based on the voltages of the battery cells C1 to C56 detected by the ADC 14 according to the abnormality signal related to the ADC 13 transmitted from the microcomputer 23. Charging / discharging control is started and the current process is terminated.

  On the other hand, in step S114, as in step S112, the microcomputer 23 displays a warning on display means (not shown) (for example, a meter panel in the passenger compartment of the vehicle 100) and outputs an abnormality signal to the ADC 14 indicating that an abnormality has been detected. It transmits to HV-ECU30.

  Note that the warning display may be a warning display that specifies that the ADC 14 is abnormal, or may be a warning display that indicates that some abnormality has occurred in the monitoring function of the battery pack 2. The driver of the vehicle 100 only needs to be able to take measures such as bringing it into a dealer in response to the warning display. Further, the microcomputer 23 may issue a voice warning through, for example, a speaker in the vehicle 100 instead of the warning display or in combination with the warning display.

  In step S115, the HV-ECU 30 continues the charge / discharge control of the battery cells C1 to C56 based on the voltages of the battery cells C1 to C56 detected by the ADC 13, and ends the current process.

  When an abnormality of the ADC 13 or the ADC 14 is detected, the process after step S106 may be executed every predetermined time for any of the ADCs 13 and 14 for which no abnormality is detected (normal). Thereby, the abnormality detection process about ADC13 or ADC14 by which abnormality was not detected can be performed. At this time, the step corresponding to the ADC 13 or the ADC 14 in which the abnormality is detected is skipped among the steps S110 and S111. Moreover, when abnormality is detected also about normal ADC13,14 by the said process, HV-ECU30 stops the charging / discharging of the battery unit 10 (battery cell C1-C56). It is because the voltage of each battery cell C1-C56 cannot be monitored appropriately.

  As described above, the charge / discharge control apparatus 1 according to the present embodiment has the stack voltage detection unit 21 when any of the voltage differences between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 is equal to or greater than the first threshold value Vth1. Based on the voltages of the battery stacks ST1 and ST2 detected by the above, whether or not the ADC 13 is abnormal is determined. Specifically, the difference between the voltages of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 and the voltages of the battery stacks ST1 and ST2 calculated based on the voltages of the battery cells C1 to C56 detected by the ADC 13. If any of these is equal to or greater than the second threshold value Vth2, an abnormality of the ADC 13 is detected.

  Thereby, abnormality of ADC13 can be detected reliably. That is, when the voltage difference between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 is equal to or greater than the first threshold value Vth1, it can be determined that an abnormality has occurred in either the ADC 13 or the ADC 14. Then, detection (identification) of the abnormality of the ADC 13 is performed based on the voltage of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21, so that it is separated from the abnormality of the stack voltage detection unit 21 and the like. Abnormalities can be reliably detected.

  Further, it is possible to detect the abnormality of the ADC 13 that performs the main monitoring function of the voltages of the battery cells C1 to C56 without providing a self-diagnosis circuit or the like for detecting the abnormality, thereby suppressing an increase in the overall circuit scale and cost. be able to.

  That is, the charge / discharge control apparatus 1 according to the present embodiment can reliably detect an abnormality in the ADC 13 that performs the main monitoring function of the voltages of the battery cells C1 to C56 while suppressing an increase in circuit scale and cost.

  In addition, the charge / discharge control device 1 according to the present embodiment is detected by the stack voltage detection unit 21 when any of the voltage differences between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 is equal to or greater than the first threshold value Vth1. Based on the voltages of the battery stacks ST1 and ST2, the presence / absence of abnormality of the ADC 14 is determined. Specifically, the difference between the voltages of the battery stacks ST1 and ST2 detected by the stack voltage detector 21 and the voltages of the battery stacks ST1 and ST2 calculated based on the voltages of the battery cells C1 to C56 detected by the ADC 14. If any of these is equal to or greater than the third threshold value Vth3, an abnormality of the ADC 14 is detected.

  Thereby, the abnormality of ADC14 can be detected reliably like the case of ADC13.

  Further, it is possible to detect an abnormality of the ADC 14 that can replace the voltage monitoring function of the battery cells C1 to C56 without providing a self-diagnosis circuit for detecting the abnormality, and suppress an increase in the overall circuit scale and cost. can do.

  That is, the charge / discharge control device 1 according to the present embodiment can reliably detect an abnormality in the ADC 14 that can replace the voltage monitoring function of the battery cells C1 to C56 while suppressing an increase in circuit scale and cost. .

  In the present embodiment, when any of the voltage differences between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 is equal to or greater than the first threshold value Vth1, it is determined that an abnormality has occurred in either the ADC 13 or the ADC 14. However, you may use the other method based on the comparison (difference) of the voltage of each battery cell C1-C56 detected by ADC13 and ADC14. For example, if a predetermined number or more of the voltage differences between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 is equal to or greater than the first threshold Vth1, it may be determined that an abnormality has occurred in either the ADC 13 or the ADC 14. . In addition, when any of the voltage differences between the battery cells C1 to C56 detected by the ADC 13 and the ADC 14 continues for the predetermined number of times or at a predetermined ratio, the ADC 13 and the ADC 14 It may be determined that an abnormality has occurred in any of them.

  Further, instead of steps S107 to S111 in FIG. 5, the determinations of steps S110 and S111 are performed only for the battery stack STj including the battery cell Ci corresponding to the counter value i when the determination condition of step S105 is not satisfied. Processing may be executed.

  In the present embodiment, the stack voltage detection unit 21 that detects the voltages of the battery stacks ST1 and ST2 is used to detect an abnormality in the ADC 13 and the ADC 14. However, other voltage detection units that detect voltages of other circuit parts are used. It is also possible to use. That is, the other voltage detection part should just detect the voltage of the predetermined circuit site | part which can be calculated (estimated) based on the predetermined relationship with the voltage of the battery cells C1-C56. As a result, the determination process corresponding to steps S110 and S111 in FIG. 5 described above can be executed.

  For example, instead of the stack voltage detection unit 21, a power supply voltage detection unit that detects the voltage (power supply voltage Vcc) of each power supply circuit 12 (12-1 to 12-14) may be used as the voltage of a predetermined circuit portion. . Since the power supply voltage Vcc of each monitoring IC 11 is generated by the power supply circuit 12 from the voltages of the four battery cells connected in series to be monitored by each monitoring IC 11, each battery cell depends on the configuration of the power supply circuit 12. It can be calculated (estimated) from the voltage. Therefore, based on the comparison between the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit and the power supply voltage Vcc of each monitoring IC 11 calculated based on the voltage of each battery cell C1 to C56 detected by the ADC 13, Whether or not the ADC 13 is abnormal can be determined. Further, based on the comparison between the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit and the power supply voltage Vcc of each monitoring IC 11 calculated based on the voltage of each battery cell C1 to C56 detected by the ADC 14, The presence or absence of abnormality of the ADC 14 can be determined. The power supply voltage detection unit corresponding to each monitoring IC 11 may be provided in each monitoring IC 11 or may be provided outside each monitoring IC 11 (for example, in the battery ECU 20 like the stack voltage detection unit 21). Good.

[Modification]
Next, a modified example of the above-described embodiment will be described.

  In this modification, the power supply generated by each power supply circuit 12 (12-1 to 12-14) of each monitoring IC 11 (11-1 to 11-14) instead of the ADC 14 (14-1 to 14-56). This embodiment is different from the above-described embodiment in that a power supply voltage detection unit that detects the voltage Vcc is used. Hereinafter, the same reference numerals are given to the same components as those in the above-described embodiment, and different portions will be mainly described.

  The power supply voltage detection unit corresponding to each monitoring IC 11 may be provided in each monitoring IC 11 as in the ADC 14 in the above-described embodiment, or may be provided outside each monitoring IC 11 (for example, in the battery ECU 20). ) May be provided.

  The power supply voltage Vcc (corresponding to the digital signal) of each monitoring IC 11 detected by the power supply voltage detection unit is transmitted to the microcomputer 23. For example, when the power supply voltage detection unit is included in each monitoring IC 11, the power supply voltage Vcc (corresponding to the digital signal) of each monitoring IC 11 detected by the power supply voltage detection unit is the monitoring IC 11-7, 11-14. To the microcomputer 23 via the isolator 22 (22-1 and 22-2).

  Similar to the above-described embodiment (step S105 in FIG. 5), the microcomputer 23 determines whether an abnormality has occurred in either the ADC 13 or the power supply voltage detection unit. As described above, the power supply voltage Vcc of each monitoring IC 11 is generated by the power supply circuit 12 from the voltages of the four battery cells connected in series to be monitored by each monitoring IC 11. And can be calculated (estimated) from the voltage of each battery cell. Therefore, based on the comparison between the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit and the power supply voltage Vcc of each monitoring IC 11 calculated based on the voltage of each battery cell C1 to C56 detected by the ADC 13, It can be determined that an abnormality has occurred in either the ADC 13 or the power supply voltage detection unit. This process is executed while incrementing the counter value i from 1 to the number of monitoring ICs (14), as in steps S103 to S105 in FIG.

  Further, when the microcomputer 23 determines that an abnormality has occurred in either the ADC 13 or the power supply voltage detection unit due to the processing, the microcomputer 23 and the ADC 13 and the same as in the above-described embodiment (steps S110 and S111 in FIG. 5). It is specified which of the power supply voltage detectors is abnormal.

  That is, the microcomputer 23 detects the abnormality of the ADC 13 based on the voltages of the battery cells C1 to C56 detected by the ADC 13 and the voltages of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 as in step S110 of FIG. The presence or absence of is determined. Specifically, the determination process of step S110 in FIG. 5 is repeatedly executed as long as the determination condition is satisfied while the counter value j is incremented from 1 to 2. When all of the counter values j = 1 to 2 satisfy the determination condition of step S110, the ADC 13 determines that it is normal, and when any of the counter values j = 1 to 2, the determination condition of step S110 is not satisfied. The ADC 13 determines that there is an abnormality.

  When the microcomputer 23 detects an abnormality in the ADC 13, as in the above-described embodiment (step S <b> 112 in FIG. 5), the microcomputer 23 displays a warning on a display unit (not shown) (for example, a meter panel in the passenger compartment of the vehicle 100). Then, an abnormality signal indicating that an abnormality has been detected in the ADC 13 is transmitted to the HV-ECU 30.

  Similarly, the microcomputer 23 is based on the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit and the voltage of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 as in step S111 of FIG. Then, it is determined whether there is an abnormality in the power supply voltage detection unit. As described above, the power supply voltage Vcc of each monitoring IC 11 is generated from the voltages of the four battery cells connected in series to be monitored by each monitoring IC 11 by the power supply circuit 12. The voltage of four battery cells connected in series can be calculated (estimated) from the power supply voltage Vcc. Therefore, the voltages of the battery stacks ST1 and ST2 are calculated (estimated) based on the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit, and the voltages of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 are calculated. As a result, it is possible to determine whether or not the power supply voltage detector is abnormal. For example, the voltages of the battery stacks ST1 and ST2 calculated based on the power supply voltage Vcc detected by the power supply voltage detection unit, and the voltages VSTj (j = 1, j) of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21. When any of the differences from 2) is equal to or greater than the fourth threshold value Vth4, the power supply voltage detection unit may determine that an abnormality has occurred. Specifically, the determination process is repeatedly executed as long as the determination condition is satisfied while incrementing the counter value j from 1 to 2. When all of the counter values j = 1 to 2 satisfy such a determination condition, the power supply voltage detection unit determines that it is normal, and when any of the counter values j = 1 to 2 does not satisfy the determination condition, The power supply voltage detection unit determines that there is an abnormality.

  If the microcomputer 23 detects an abnormality in the power supply voltage detection unit, as in the above-described embodiment (step S114 in FIG. 5), the microcomputer 23 warns a display unit (not shown) (for example, a meter panel in the vehicle interior of the vehicle 100). In addition to displaying, an abnormality signal indicating that an abnormality has been detected is transmitted to the HV-ECU 30.

  Thus, the charge / discharge control apparatus 1 according to the modification uses the power supply voltage Vcc of each monitoring IC 11 detected by the power supply voltage detection unit, and the ADC 13 that performs the main monitoring function of the voltages of the battery cells C1 to C56. Abnormalities can be reliably detected.

  Further, it is possible to detect the abnormality of the ADC 13 that performs the main monitoring function of the voltages of the battery cells C1 to C56 without providing a self-diagnosis circuit or the like for detecting the abnormality, thereby suppressing an increase in the overall circuit scale and cost. be able to.

  That is, the charge / discharge control device 1 according to the modification can reliably detect an abnormality of the ADC 13 that performs the main monitoring function of the voltages of the battery cells C1 to C56 while suppressing an increase in circuit scale and cost.

  As in the above-described embodiment, the HV-ECU 30 performs charge / discharge control based on the voltage of each of the battery cells C1 to C56 detected by the ADC 13 during normal times (when the ADC 13 is normal).

  On the other hand, when the abnormality of the ADC 13 is detected, the HV-ECU 30 greatly increases the voltage range of the battery cells C1 to C56 detected by the ADC 13 or the range for controlling the SOC of the battery cells C1 to C56 based on the voltage. The charge / discharge control is continued or the charge / discharge control is stopped.

  For example, the difference between the voltage of the battery stacks ST1 and ST2 calculated based on the voltages of the battery cells C1 to C56 detected by the ADC 13 and the voltage of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21 is a limit value. If it is smaller than Vlim (> second threshold Vth2), the range of controlling the voltage of each of the battery cells C1 to C56 detected by the ADC 13 or the SOC of each of the battery cells C1 to C56 based on the voltage is greatly limited. To continue charge / discharge control. On the other hand, the difference between the voltage of the battery stacks ST1 and ST2 calculated based on the voltage of each of the battery cells C1 to C56 detected by the ADC 13 and the voltage of the battery stacks ST1 and ST2 detected by the stack voltage detection unit 21. When is equal to or greater than the limit value Vlim, the charge / discharge control is stopped.

  As described above, the charge / discharge control device 1 according to the modified example has the battery unit 10 (battery cell) when the abnormality degree is equal to or less than a predetermined value even if the abnormality occurs in the ADC 13 that performs the main monitoring function of the battery cells C1 to C56. C1-C56) charge / discharge control can be continued. Therefore, the fuel consumption deterioration of the vehicle 100 due to the charge / discharge stop of the battery unit 10 (battery cells C1 to C56) can be minimized.

  The stack voltage detection unit 21 that detects the voltage of the battery stacks ST1 and ST2 is used to detect an abnormality in the ADC 13 and the power supply voltage detection unit. However, as in the above-described embodiment, the voltages of other circuit parts are detected. It is also possible to use other voltage detectors. That is, the other voltage detection part should just detect the voltage of the predetermined circuit part which can be calculated (estimated) based on the predetermined relationship with the voltage of the battery cells C1-C56 and the power supply voltage Vcc. However, when the power supply voltage detection unit exemplified in the above-described embodiment is used, it is necessary to provide it separately from the power supply voltage detection unit in the present modification.

  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.

  For example, in the above-described embodiment and modification, the charge / discharge control device 1 performs voltage monitoring in units of each battery cell as a power storage unit, but as a power storage unit according to the type of power storage unit, for example, You may monitor the voltage in the module unit which connected the some battery cell in series or in parallel.

  Moreover, when the battery unit 10 (battery cells C1 to C56) can be charged by external power feeding, the charge / discharge control device 1 according to the embodiment or the modification described above is in a parking state (ignition off state) of the vehicle 100. You may perform charge control at the time of charge.

  The charge / discharge control device 1 according to the embodiment and the modification described above is 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. You may apply to the charging / discharging control of an electrical storage part.

  Further, the charge / discharge control device 1 according to the embodiment and the modification described above may be applied to charge / discharge control of a power storage unit other than the vehicle (for example, a battery cell in a stationary power storage device).

DESCRIPTION OF SYMBOLS 1 Charging / discharging control apparatus 2 Battery pack 10 Battery unit 11, 11-1 to 11-14 Monitoring IC
12, 12-1 to 12-14 Power supply circuit 13, 13-1 to 13-56 AD converter (first voltage detector)
14, 14-1 to 14-56 AD converter (second voltage detector)
15, 16 Communication line 20 Battery ECU
21, 21-1, 21-2 Stack voltage detector (third voltage detector)
22, 22-1, 22-2 Isolator 23 Microcomputer (control unit)
30 HV-ECU (control unit)
40 Engine 50 Motor 60 Generator 70 Motor Inverter 80 Generator Inverter C1 to C56 Battery Cell (Power Storage Unit)
SP Service plug ST1, ST2 Battery stack (storage block)
V + Positive terminal V- Negative terminal

Claims (5)

A plurality of connected power storage units;
A first voltage detection unit for detecting a voltage of each of the plurality of power storage units;
A second voltage detection unit that detects a voltage of each of the plurality of power storage units, the second voltage detection unit having lower detection accuracy than the first voltage detection unit;
A third voltage detector that detects a voltage of a predetermined circuit part that can be calculated based on the voltages of each of the plurality of power storage units;
The state of charge of each of the plurality of power storage units based on the voltage of each of the plurality of power storage units detected by the first voltage detection unit or the voltage of each of the plurality of power storage units detected by the first voltage detection unit Is provided with a control unit that performs charge / discharge control of the plurality of power storage units, so as to fall within the first predetermined range,
The controller is
Based on a comparison of the voltages of the plurality of power storage units detected by the first voltage detection unit and the second voltage detection unit, an abnormality has occurred in either the first voltage detection unit or the second voltage detection unit. And determining whether or not there is an abnormality in the first voltage detection unit based on the voltage of the predetermined circuit part detected by the third voltage detection unit, and determining whether or not the first voltage detection unit is abnormal. If detected, the plurality of power storages based on the voltages of the plurality of power storage units detected by the second voltage detection unit or the voltages of the plurality of power storage units detected by the second voltage detection unit. Charging / discharging control of the plurality of power storage units is performed such that a state of charge of the unit falls within a second predetermined range narrower than the first predetermined range,
Charge / discharge control device. The controller is
When any of the voltage differences of the plurality of power storage units detected by the first voltage detection unit and the second voltage detection unit is equal to or greater than a predetermined first threshold, the third voltage detection unit detects the difference. Based on the voltage of the predetermined circuit part, it is determined whether there is an abnormality in the first voltage detection unit,
The charge / discharge control apparatus according to claim 1. The third voltage detector is
Detecting a voltage of two or more power storage blocks configured by dividing the plurality of power storage units into two or more blocks as a voltage of the predetermined circuit portion;
The controller is
The difference between each of the plurality of power storage units detected by the first voltage detection unit and the second voltage detection unit is not less than the predetermined first threshold value and is detected by the first voltage detection unit. Any of the differences between the voltages of the storage blocks calculated based on the voltages of the plurality of stored storage units and the voltages of the storage blocks detected by the third voltage detection unit is greater than or equal to a predetermined second threshold value In this case, the abnormality of the first voltage detection unit is detected.
The charge / discharge control apparatus according to claim 2. The third voltage detector is
A voltage of the power source that supplies driving power to the first voltage detection unit and the second voltage detection unit as the voltage of the predetermined circuit part, and is generated from the power supplied from the plurality of power storage units Detect
The controller is
If any of the voltage differences of the plurality of power storage units detected by the first voltage detection unit and the second voltage detection unit is equal to or greater than the predetermined first threshold, the first voltage detection unit detects the difference. Based on the comparison between the voltage of the power source calculated based on the voltages of the plurality of power storage units and the voltage of the power source detected by the third voltage detection unit, the presence or absence of abnormality of the first voltage detection unit is determined. It is characterized by judging,
The charge / discharge control apparatus according to claim 2. A plurality of connected power storage units;
A first voltage detection unit for detecting a voltage of each of the plurality of power storage units;
A second voltage detection unit that detects a voltage of a predetermined circuit portion that can be calculated based on the voltages of each of the plurality of power storage units;
A third voltage detection unit that detects a voltage of each of the plurality of power storage units and a voltage of a predetermined other circuit part that can be calculated based on a voltage of the predetermined one circuit part;
The state of charge of each of the plurality of power storage units based on the voltage of each of the plurality of power storage units detected by the first voltage detection unit or the voltage of each of the plurality of power storage units detected by the first voltage detection unit Is provided with a control unit that performs charge / discharge control of the plurality of power storage units, so as to fall within the first predetermined range,
The controller is
The voltage of the predetermined circuit portion calculated based on the voltages of the plurality of power storage units detected by the first voltage detection unit and the predetermined circuit portion detected by the second voltage detection unit The predetermined other circuit portion detected by the third voltage detector when it is determined that an abnormality has occurred in either the first voltage detector or the second voltage detector based on the comparison of the voltages of And determining whether there is an abnormality in the first voltage detection unit, and detecting an abnormality in the first voltage detection unit, wherein the degree of abnormality in the first voltage detection unit is not more than a predetermined level. The plurality of power storage units based on the voltages of the plurality of power storage units detected by the first voltage detection unit or the voltages of the plurality of power storage units detected by the first voltage detection unit. The charging state is narrower than the first predetermined range. To fit in a predetermined range, and executes the charging and discharging control of the plurality of power storage units,
Charge / discharge control device.

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