JP2018085790A - Battery controller of electric vehicle and battery control method of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery controller of an electric vehicle, which can shorten charging time while travel performance of a cruising distance of the electric vehicle is maintained.SOLUTION: A battery controller of an electric vehicle comprises: a charging circuit for charging a plurality of batteries mounted on the electric vehicle; a power supply circuit for supplying DC current received from an external power supply device to the charging circuit; and connection state switching means for switching a connection state of the plurality of batteries. The connection state switching means sets the connection state of the plurality of batteries to a parallel connection when the electric vehicle travels and sets the connection state of the plurality of batteries to a series connection when the plurality of batteries are charged by the external power supply device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery control device and a battery control method for an electric vehicle, and more particularly, to a technology for charging and discharging a battery mounted on an electric vehicle.

  2. Description of the Related Art Conventionally, an electric vehicle that does not have an internal combustion engine and is driven by electric power supplied from a mounted battery, and an electric vehicle such as a register extender that includes an internal combustion engine for power generation are known. Further, from the viewpoint of the popularization of electric vehicles, it is required to extend the cruising distance of such electric vehicles, and development and research for satisfying the requirements are being made. For example, Patent Document 1 discloses an electric vehicle capable of extending a cruising distance by suppressing the viscosity state of oil that lubricates a gear mechanism from being maintained high.

  And in such an electric vehicle, in order to charge the battery mounted, the battery charging method which supplies a direct current to a battery with the external electric power feeder provided outside the vehicle is taken. In addition, from the viewpoint of the popularization of electric vehicles, shortening of charging time is required, and development and research for satisfying the request are being made. For example, Patent Document 2 discloses that by providing a plurality of AC power supply ports on the vehicle side, the maximum value of the obtained current is increased and the charging time is shortened.

JP 2012-235579 A JP 2014-155420 A

  In discharging using battery power, power is supplied from the battery to various devices mounted inside the vehicle. However, in battery charging, power is supplied to the battery from outside the vehicle. The supply path and the device associated with the battery are different. For this reason, little research and development has been conducted to satisfy both the extension of the cruising range and the reduction of the charging time.

  However, from the viewpoint of further popularization of electric vehicles in consideration of environmental considerations, it is important to satisfy both the extension of the cruising distance and the reduction of the charging time, and the demand is also increased.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a battery control device for an electric vehicle capable of shortening the charging time while maintaining the cruising performance of the electric vehicle. And providing a battery control method.

  (1) A battery control device for an electric vehicle according to this application example includes a charging circuit that charges a plurality of batteries mounted on the electric vehicle, and a power supply circuit that supplies a direct current received from an external power feeding device to the charging circuit. And connection state switching means for switching the connection states of the plurality of batteries, wherein the connection state switching means sets the connection states of the plurality of batteries in parallel when the electric vehicle is running, and is based on the external power supply device. When charging the plurality of batteries, the connection state of the plurality of batteries is set in series connection.

  In the battery control device for an electric vehicle according to this application example, by using a battery connected in parallel as a power source for the electric vehicle, an increase in the voltage of the battery can be suppressed, and the power consumption of the battery itself is reduced. can do. That is, while the electric vehicle is running, power consumption in the battery is suppressed, and the cruising distance performance of the electric vehicle can be maintained in an excellent state. On the other hand, when charging a battery connected in series, the voltage of the battery can be increased as compared with a case where the connection state of the batteries is set in a parallel state. That is, at the time of charging the battery, charging can be performed at a higher voltage from the external power feeding device, and the charging time can be shortened as compared with charging in the parallel state. And since the connection state of the said battery is implement | achieved by the connection state switching means, it becomes possible to shorten charging time, maintaining the cruising range driving performance of an electric vehicle.

  (2) In the battery control device for an electric vehicle according to this application example, in the above (1), the connection state switching unit may switch the connection state of the plurality of batteries for each power storage unit including the plurality of batteries. Good. As a result, useless connection state switching is not performed even for a power storage unit that does not require charging, and more optimal charging can be realized.

  (3) In the battery control device for an electric vehicle according to this application example, in (2) above, the connection state switching unit may switch the connection states of the plurality of batteries outside the power storage unit. As a result, even if the power storage unit fails, only the power storage unit needs to be replaced, so that the maintainability of the electric vehicle can be improved. In addition, a circuit in the power storage unit can be simplified, a battery with high versatility can be used, and cost reduction can be realized.

  (4) In the battery control device for an electric vehicle according to this application example, in the above (2), the connection state switching unit may switch the connection states of the plurality of batteries inside the power storage unit. As a result, the circuit configuration around the battery can be further simplified, and the number of components mounted on the electric vehicle can be reduced.

  (5) In the battery control device for an electric vehicle according to the application example, in any one of the above (1) to (4), the connection state switching unit is a charging plug of the external power feeding device with respect to a power receiving port of the electric vehicle. The connection state of the plurality of batteries may be switched when the battery is attached or detached. Thereby, it is not necessary for the charger of the electric vehicle to switch the connection state, and it is possible to prevent running or charging in an inappropriate connection state of the battery.

  (6) A battery control method for an electric vehicle according to this application example is a battery control method for an electric vehicle that controls a plurality of batteries mounted on the electric vehicle, and the plurality of batteries are connected when the electric vehicle is running. A parallel connection maintaining step for maintaining the state in parallel connection, a series connection maintaining step for maintaining the connection state of the plurality of batteries in series connection when charging the plurality of batteries by an external power supply device, and a connection state of the plurality of batteries Switching step before and after charging the plurality of batteries by the external power feeding device.

  In the battery control method for an electric vehicle according to this application example, a battery maintained in a parallel state is used as a power source for the electric vehicle, so that an increase in the voltage of the battery can be suppressed, and the power consumption of the battery itself can be reduced. Can be reduced. That is, while the electric vehicle is running, power consumption in the battery is suppressed, and the cruising distance performance of the electric vehicle can be maintained in an excellent state. On the other hand, when charging a battery maintained connected in series, the voltage of the battery can be increased as compared with a case where the connection state of the battery is set in a parallel state. That is, at the time of charging the battery, charging can be performed at a higher voltage from the external power feeding device, and the charging time can be shortened as compared with charging in the parallel state. And since the connection state switching step which switches the connection state of the said battery is performed appropriately, it becomes possible to shorten charging time, maintaining the cruising range driving performance of an electric vehicle.

  (7) In the battery control method for an electric vehicle according to the application example, in (6), in the parallel connection maintaining step and the serial connection maintaining step, the connection state of the battery for each power storage unit including the plurality of batteries In the connection state switching step, the connection states of the plurality of batteries may be switched for each power storage unit. As a result, useless connection state switching is not performed even for a power storage unit that does not require charging, and more optimal charging can be realized.

  (8) In the battery control method for an electric vehicle according to this application example, in (7) above, in the connection state switching step, the connection states of the plurality of batteries may be switched outside the power storage unit. As a result, the circuit configuration around the battery can be further simplified, and the number of components mounted on the electric vehicle can be reduced.

  (9) In the battery control method for an electric vehicle according to this application example, in (8) above, in the connection state switching step, the connection states of the plurality of batteries may be switched inside the power storage unit. As a result, even if the power storage unit fails, only the power storage unit needs to be replaced, so that the maintainability of the electric vehicle can be improved. In addition, a circuit in the power storage unit can be simplified, a battery with high versatility can be used, and cost reduction can be realized.

  (10) In the battery control method for an electric vehicle according to this application example, in any one of the above (6) to (9), in the connection state switching step, the external power feeding device is charged to the power receiving port of the electric vehicle. The connection state of the plurality of batteries may be switched when the plug is attached or detached. Thereby, it is not necessary for the charger of the electric vehicle to switch the connection state, and it is possible to prevent running or charging in an inappropriate connection state of the battery.

  According to the present invention using the above means, the charging time can be shortened while maintaining the cruising distance performance of the electric vehicle.

1 is a system configuration diagram of an electric vehicle including a battery control device according to an embodiment of the present invention. It is a schematic circuit diagram around a high-voltage power storage unit in a state where there is no power reception from an external power feeding device. It is a schematic circuit diagram around a high-voltage power storage unit in a situation where power is received from an external power feeding device. It is a circuit diagram of the battery periphery for demonstrating charge to the battery by an external electric power feeder. It is a circuit diagram of the battery periphery for demonstrating discharge of the battery at the time of vehicle travel.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a system configuration diagram of an electric vehicle including a battery control device according to an embodiment of the present invention, which will be described with reference to FIG.

  A vehicle 1 shown in FIG. 1 is an electric vehicle truck (that is, an electric truck) including a motor 2 as a travel drive source. The motor 2 is an electric motor that can also operate as a generator, such as a permanent magnet synchronous motor. The output shaft of the motor 2 is connected to a differential device 4 via a propeller shaft 3, and left and right drive wheels 6 are connected to the differential device 4 via a drive shaft 5. The vehicle 1 is not limited to a truck type, and may be a general passenger car, a bus, and other automobile types as long as it includes a motor as a travel drive source.

  A high voltage power storage unit 13 is connected to the motor 2 via an inverter / converter (hereinafter simply referred to as an inverter) 10, a junction box 11, and a charging circuit 12. The DC power stored in the high-voltage power storage unit 13 is converted into AC power by the inverter 10 and supplied to the motor 2, and the driving force generated by the motor 2 is transmitted to the drive wheels 6 to drive the vehicle 1. For example, when the vehicle 1 decelerates or travels on a downhill road (regenerative travel), the motor 2 operates as a generator (regenerative operation) by reverse driving from the drive wheels 6 side. The negative driving force generated by the motor 2 is transmitted to the driving wheel 6 side as a braking force, and the AC power generated by the motor 2 is converted into DC power by the inverter 10 so that the junction box 11 and the charging circuit 12 are connected. The high voltage power storage unit 13 is charged via

  The junction box 11 is connected to various electric devices mounted on the vehicle 1. Various types of switches or contactors (electromagnetic contactors) for connecting / disconnecting the electric circuit are provided inside the junction box 11. By switching the switches or connecting / disconnecting the contactors, various electrical devices can be connected. It is possible to control the supply and cut-off of power. The detailed structure of the junction box 11 will be described later.

  For example, the junction box 11 is connected to a high pressure auxiliary machine 14 such as a cooler compressor or a pump of a power steering device. The high-voltage auxiliary machines 14 operate by receiving power supply from the high-voltage power storage unit 13.

  Moreover, the low voltage electrical storage part (all are not shown) may be connected to the junction box 11 via the DC-DC converter. Thereby, for example, it is possible to appropriately supply power to devices that are driven at a low voltage, such as an ECU and a connector described later.

  Furthermore, a power receiving port 15 is connected to the junction box 11 via a power supply circuit 16. As a result, a DC current for charging the high voltage power storage unit 13 can be supplied to the junction box 11 from the external power supply device 20. In the present embodiment, the external power supply device 20 includes a charging plug 21, an AC-DC converter 22, and an AC power supply 23. From such a configuration, by inserting the charging plug 21 into the power receiving port 15 provided on the side surface or the back surface of the vehicle 1, the AC current supplied from the AC power supply 23 is converted into a DC current by the AC-DC converter 22, The direct current is supplied from the charging plug 21 to the vehicle 1. For the external power supply device 20, for example, 100V and 200V ordinary charging for home use, quick charging, and non-contact charging can be used as appropriate.

  The power supply circuit 16 supplies a direct current received from the external power supply device 20 via the power receiving port 15 to the charging circuit 12 via the junction box 11. For example, the power supply circuit 16 may be a circuit in which electronic parts such as a coil, a diode, a transistor, and a capacitor are arranged and have desired characteristics, or a circuit that simply supplies a direct current in one direction. May be. The power supply circuit 16 may be shared with a desired circuit in the junction box 11. That is, the power supply circuit 16 may be provided in the junction box 11.

  A high voltage power storage unit 13 is connected to the junction box 11 via a charging circuit 12. With such a connection configuration, a direct current is supplied to the charging circuit 12 from the power supply circuit 16 via the junction box 11, and the direct current is further supplied to the high voltage power storage unit 13.

  For example, the charging circuit 12 may be a circuit having electronic characteristics such as a coil, a diode, a transistor, and a capacitor and having desired characteristics, or a circuit that simply supplies a direct current in one direction. Also good. Further, the charging circuit 12 may be shared with a desired circuit in the junction box 11. That is, the charging circuit 12 may be provided in the junction box 11.

  As described above, in the present embodiment, the power stored in the high voltage power storage unit 13 is supplied to the junction box 11 via the charging circuit 12, and thus the charging circuit 12 also functions as a discharging circuit. Become. Note that the charging circuit and the discharging circuit may be provided independently.

  The high voltage power storage unit 13 includes a plurality of battery modules 13a to 13d, which will be described later, and is a power source for traveling used for the motor 2 that is a drive source. Moreover, the high voltage electrical storage part 13 has a predetermined operating temperature range suitable for exhibiting performance.

  As shown in FIG. 1, the vehicle 1 includes an input / output device (not shown), a storage device (ROM, RAM, etc.) used for storing control programs and control maps, a central processing unit (CPU), a timer counter, and the like. The equipped ECU 30 is mounted. The ECU 30 in the present embodiment is a control unit that mainly controls the junction box 11, but the vehicle 1 may be provided with various other ECUs.

  The ECU 30 is electrically connected to the high voltage power storage unit 13 and the power receiving port 15. The ECU 30 can acquire information on the battery state such as SOC (State Of Charge) corresponding to the charge amount of the high voltage power storage unit 13 and the battery temperature from the high voltage power storage unit 13. Further, the ECU 30 can also acquire information related to the progress of charging of the high voltage power storage unit 13. Furthermore, the ECU 30 can also acquire information about whether or not the external power feeding device 20 is connected from the power receiving port 15. For example, the power receiving port 15 is provided with a contact sensor, and when the charging plug 21 contacts the power receiving port 15, the sensor signal from the contact sensor is supplied to the ECU 30 and the external power supply device 20 is connected. The ECU 30 may recognize it.

  Note that the ECU 30 may also be electrically connected to the junction box 11, the charging circuit 12, and the power supply circuit 16. In such a case, based on information (for example, direct current value) supplied from each device, whether or not the high-voltage power storage unit 13 is properly charged, and further, the charge is accurately performed. It is possible to analyze the causes that are not present.

  Then, the ECU 30 controls the operation of the junction box 11. Specifically, the ECU 30 supplies a control signal for instructing switching of the switch in the junction box 11 or execution of connection / disconnection of the contactor. When the junction box 11 receives the control signal, the junction box 11 starts control corresponding to the control signal, and supplies and interrupts power to various electrical devices.

  Next, switching of the connection state in the high voltage power storage unit 13 by the junction box 11 will be described with reference to FIGS. 2 and 3. Here, FIG. 2 is a schematic circuit diagram of the periphery of the high-voltage power storage unit 13 in a state where the vehicle 1 is traveling and no power is received from the external power feeding device 20. On the other hand, FIG. 3 is a schematic circuit diagram around the high-voltage power storage unit 13 in a situation where the vehicle 1 is stopped and there is power reception from the external power feeding device 20.

  First, as shown in FIG.2 and FIG.3, the high voltage electrical storage part 13 has four battery modules 13a-13d. Here, the battery module 13a has, for example, a structure including a plurality of lithium ion batteries as battery cells. The number of battery modules is not limited to four, and can be changed as appropriate according to the amount of charge required for the high voltage power storage unit 13 and the charge capacity of one battery module.

  As shown in FIG. 2, when the vehicle 1 is traveling, the connection state of the four battery modules 13a to 13d is maintained in parallel connection by the control of the junction box 11 (parallel connection maintaining step). By using the battery modules 13a to 13d connected in such a parallel state as the power source of the motor 2, the voltage increase of the high voltage power storage unit 13 can be suppressed, and the power consumption of the high voltage power storage unit 13 itself can be reduced. Can be reduced. That is, while the vehicle 1 is traveling, the power consumption in the high voltage power storage unit 13 is suppressed, and the cruising distance performance of the vehicle 1 can be maintained in an excellent state.

  On the other hand, as shown in FIG. 3, when the charging plug 21 is inserted into the power receiving port 15 to charge the high voltage power storage unit 13 in a state where the vehicle 1 is stopped, the four battery modules are controlled by the control of the junction box 11. The connection states 13a to 13d are maintained in series connection (series connection maintaining step). As a result, the direct current received from the charging plug 21 is supplied to the high voltage power storage unit 13 via the power supply circuit 16 and the charging circuit 12.

  If the high voltage electrical storage part 13 is comprised from the battery modules 13a-13d connected in such a serial state, the voltage of the high voltage electrical storage part 13 can be raised compared with the case of the parallel state mentioned above. That is, at the time of charging the high voltage power storage unit 13, charging can be performed at a higher voltage from the external power supply device 20, and the charging time can be shortened compared to charging in a parallel state.

  Note that the value of the current flowing from the high voltage power storage unit 13 to the motor 2 when the vehicle 1 is traveling is the same as the value of the current flowing to the high voltage power storage unit 13 when the vehicle 1 is charged by the external power supply device 20. Is set to About the said setting, you may adjust with the junction box 11, the charging circuit 12, the electric power supply circuit 16, and the external electric power feeder 20, for example.

  The junction box 11 switches the connection state of the four battery modules 13a to 13d before and after charging the high voltage power storage unit 13 (connection state switching step). More specifically, the junction box 11 may automatically switch the connection state when the charging plug 21 is attached to or detached from the power receiving port 15. Thereby, it is not necessary for the charger of the vehicle 1 to switch the connection state, and traveling or charging can be prevented from being performed in an inappropriate connection state of the battery modules 13a to 13d.

  From the above, in the junction box 11 according to the present embodiment, the battery modules 13a to 13d are connected in parallel when the vehicle 1 is traveling, and the battery modules 13a to 13d are charged when the battery modules 13a to 13d are charged by the external power supply device 20. It functions as a connection state switching means for connecting the connection state of 13d in series. By realizing the connection state switching means using the junction box 11 as described above, it is possible to shorten the charging time while maintaining the cruising performance of the vehicle 1. In particular, the charging time is half or less than that of the conventional case (when charging in a parallel state), and the charging time can be shortened.

  In the present embodiment, the junction box 11 that functions as the connection state switching means is provided outside the high voltage power storage unit 13, so that even if the high voltage power storage unit 13 fails, the high voltage Since only the power storage unit 13 needs to be replaced, the maintainability of the vehicle 1 can be improved. Further, the circuit in the high voltage power storage unit 13 can be simplified, the use of the high-voltage power storage unit with high versatility is possible, and the cost can be reduced.

  Next, an example of a circuit of the junction box 11 that switches the connection state of a plurality of batteries (including a module base or a larger power storage unit) will be described with reference to FIGS. 4 and 5. However, the case where the connection state different from FIG. 3 is maintained will be described. Here, FIG. 4 is a circuit diagram around the battery for explaining charging of the battery according to the present embodiment by the external power feeding device, and FIG. 5 is for explaining discharge of the battery according to the present embodiment when the vehicle travels. It is a circuit diagram around the battery.

  As shown in FIGS. 4 and 5, the power receiving port 15 and the power supply circuit 16 are connected to the input terminal 11a of the junction box 11, and the motor 2 is connected to the output terminal 11b. A charging circuit 12 is connected to the input / output terminal 11 c of the junction box 11. Further, four switches are provided inside the junction box 11, and the switches S1, S2, S3, and S4 are switched by a switch control signal from the ECU 30.

  On the other hand, four batteries 41, 42, 43, 44 are connected to the charging circuit 12. In these batteries, a plurality of lithium ion batteries are connected in series as battery cells. As described above, the battery may be modularized as described above, or a battery formed as a larger power storage unit may be used.

  At the time of charging by the external power supply device 20, as shown in FIG. 4, the wiring (shown by a thick solid line) electrically connected to the plus terminal of the external power supply device 20 in the power supply circuit 16 is connected to the junction box 11. It is connected to the positive terminals of the batteries 41 and 42 via the switch S1. Further, the wiring (shown by a thin solid line) connected to the negative terminals of the batteries 41 and 42 is connected to the positive terminals of the batteries 43 and 44 via the switch S2, the bypass wiring W1, and the switch S3 in the junction box 11. The Furthermore, the wiring (shown by a thin solid line) connected to the negative terminals of the batteries 43 and 44 is electrically connected to the negative terminal of the external power supply device 20 via the switch S4.

  In the state of each switch and circuit wiring of the junction box 11, the connection state between the battery 41 and the battery 42 is parallel connection, the connection state between the battery 43 and the battery 44 is parallel connection, The connection state of the first battery group including the battery 42 and the first battery group including the battery 43 and the battery 44 is connected in series. Therefore, the voltage of the power storage unit composed of the four batteries 41 to 44 can be increased more than when all the batteries 41 to 44 are connected in parallel, and rapid charging can be performed.

  On the other hand, when the vehicle travels as shown in FIG. 5, the wiring (shown by a thick solid line) connected to the positive terminals of the batteries 41 and 42 is electrically connected to the positive terminal of the motor 2 via the switch S1. Connected to. Further, wiring (shown by a thick solid line) connected to the plus terminals of the batteries 43 and 44 is also electrically connected to the plus terminal of the motor 2 via the switch S3. Here, the wiring connected to the positive terminals of the batteries 41 and 42 and the wiring connected to the positive terminals of the batteries 43 and 44 are connected in the junction box 11 to constitute a common circuit. On the other hand, the wiring (shown by a thin solid line) connected to the negative terminals of the batteries 41 and 42 is electrically connected to the negative terminal of the motor 2 via the switch S2. Further, the wiring (shown by a supplemental solid line) connected to the negative terminals of the batteries 43 and 44 is also electrically connected to the negative terminal of the motor 2 via the switch S4. Similar to the plus side wiring configuration, the wiring connected to the negative terminal of the batteries 41 and 42 and the wiring connected to the negative terminal of the batteries 43 and 44 are connected in the junction box 11 and are connected to the common circuit. Is configured.

  In such a state of each switch and circuit wiring of the junction box 11, the connection state of the batteries 41 to 44 is parallel connection. Therefore, the voltage of the power storage unit composed of the four batteries 41 to 44 can be lowered more than the state where some of the batteries 41 to 44 are connected in series, and the power consumption and the cruising distance performance of the vehicle 1 can be reduced. Improvements can be made.

  In the above-described embodiment, the junction box 11 functions as a connection state switching unit that switches the connection state of the battery module or the battery. However, components other than the junction box 11 may be used as the connection state switching unit. For example, a distribution unit or a simple switch may be used as the connection state switching means.

  Further, the number of high-voltage power storage units 13 is not limited to one, and increases as appropriate according to the dimensions of the vehicle 1, the amount of power required for the vehicle 1, the charge capacity of one high-voltage power storage unit 13, and the like. You can also Further, the high voltage power storage unit 13 may be divided into two or more so that the individual power storage units correspond to the motor 2 and the high-voltage auxiliary machinery 14 respectively. In such a case, useless connection state switching is not performed even for a power storage unit that does not require charging, and more optimal charging can be realized.

  And in embodiment mentioned above, although the junction box 11 which functions as the said connection state switching means was provided in the outer side of the high voltage electrical storage part 13, a switch was provided inside the high voltage electrical storage part 13, and the said switch was You may make it function as the said connection state switching means. That is, the connection state switching means for switching the connection state of the battery may be provided in the battery module or the power storage unit. As a result, the circuit configuration can be further simplified, and the number of components mounted on the vehicle 1 can be reduced.

  Further, if the connection state of the battery can be switched, the connection state switching means may be provided outside the vehicle 1. Thereby, the number of parts mounted in the vehicle 1 can be reduced, and the maintainability of the vehicle 1 can also be improved.

  Furthermore, in the above-described embodiment, the direct current is supplied to the vehicle 1. However, the alternating current may be supplied to the vehicle 1 and the alternating current may be converted into the direct current in the vehicle 1.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Motor 3 Propeller shaft 4 Differential device 5 Drive shaft 6 Drive wheel 10 Inverter / converter (inverter)
DESCRIPTION OF SYMBOLS 11 Junction box 12 Charging circuit 13 High voltage electrical storage part 14 High voltage accessories 15 Power receiving port 16 Electric power supply circuit 20 External power supply device 21 Charging plug 22 AD-DC converter 23 AC power supply 30 ECU
41, 42, 43, 44 Battery S1, S2, S3, S4 Switch W1 Bypass wiring

Claims (10)

A charging circuit for charging a plurality of batteries mounted on the electric vehicle;
A power supply circuit for supplying a direct current received from an external power supply device to the charging circuit;
Connection state switching means for switching the connection state of the plurality of batteries,
The connection state switching means sets the connection state of the plurality of batteries in parallel connection when the electric vehicle is running, and sets the connection state of the plurality of batteries in series connection when the plurality of batteries are charged by the external power feeding device. Automotive battery control device.   The battery control device for an electric vehicle according to claim 1, wherein the connection state switching means switches the connection state of the plurality of batteries for each power storage unit including the plurality of batteries.   The battery control device for an electric vehicle according to claim 2, wherein the connection state switching unit switches connection states of the plurality of batteries outside the power storage unit.   The battery control device for an electric vehicle according to claim 2, wherein the connection state switching unit switches connection states of the plurality of batteries inside the power storage unit.   5. The electric vehicle according to claim 1, wherein the connection state switching unit switches connection states of the plurality of batteries when a charging plug of the external power feeding device is attached to or detached from a power receiving port of the electric vehicle. Battery control device. An electric vehicle battery control method for controlling a plurality of batteries mounted on an electric vehicle,
A parallel connection maintaining step for maintaining the connection state of the plurality of batteries in parallel connection when the electric vehicle is running,
A series connection maintaining step of maintaining the connection state of the plurality of batteries in series connection when charging the plurality of batteries by an external power supply device;
A connection state switching step of switching connection states of the plurality of batteries before and after charging of the plurality of batteries by the external power supply device. In the parallel connection maintaining step and the serial connection maintaining step, the connection state of the battery is maintained for each power storage unit composed of the plurality of batteries,
The battery control method for an electric vehicle according to claim 6, wherein in the connection state switching step, the connection state of the plurality of batteries is switched for each power storage unit.   The battery control method for an electric vehicle according to claim 7, wherein in the connection state switching step, the connection states of the plurality of batteries are switched outside the power storage unit.   The battery control method for an electric vehicle according to claim 7, wherein in the connection state switching step, the connection state of the plurality of batteries is switched inside the power storage unit.   The electrical connection according to any one of claims 6 to 9, wherein, in the connection state switching step, the connection state of the plurality of batteries is switched when a charging plug of the external power feeding device is attached to or detached from a power receiving port of the electric vehicle. Battery control method for automobiles.

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