WO2012029317A1

WO2012029317A1 - Battery system, electrically driven vehicle provided with same, moving body, power storage apparatus, power supply apparatus, and electrical equipment

Info

Publication number: WO2012029317A1
Application number: PCT/JP2011/004893
Authority: WO
Inventors: 智徳國光; 由知西原; 岸本　圭司
Original assignee: 三洋電機株式会社
Priority date: 2010-08-31
Filing date: 2011-08-31
Publication date: 2012-03-08

Abstract

A battery system is provided with battery modules and a bus. Each of the battery modules comprises a plurality of battery cells and a main circuit board. The main circuit board comprises first circuits, a second circuit, and a terminator. Voltages of the battery cells of the battery module are detected by the first circuits of the main circuit board. The terminator of the main circuit board is connected to the bus. The voltages of the battery cells detected by the first circuits of the main circuit board can be transmitted to an external device via the bus, by the second circuit of the main circuit board.

Description

BATTERY SYSTEM, ELECTRIC VEHICLE EQUIPPED WITH THE SAME, MOBILE BODY, POWER STORAGE DEVICE, POWER SUPPLY DEVICE, AND ELECTRIC DEVICE

The present invention relates to a battery system including a battery module, an electric vehicle, a moving body, a power storage device, a power supply device, and an electric device.

A battery system including a plurality of battery modules is mounted on an electric vehicle such as an electric bicycle. Each battery module includes a communication unit. The battery module is communicably connected to other battery modules and other devices via the communication unit.

In the vehicle power supply device described in Patent Literature 1, various types of information are transmitted and received between a plurality of battery modules (capacitor cell modules), a hybrid ECU (electronic control unit), a motor of the vehicle, and an inverter. Is built. Thereby, information on each battery module is transmitted to the hybrid ECU via the communication network, and information on the hybrid ECU is transmitted to each battery module via the communication network.
JP 2002-281690 A

In the vehicle power supply device disclosed in Patent Document 1, a termination resistor is attached to the communication network in order to prevent unnecessary reflection of signals at the end of the communication network. Therefore, complicated wiring work is required to attach the terminal resistor to the communication network of the vehicle power supply device, and the wiring structure of the vehicle power supply device is complicated.

An object of the present invention is to provide a battery system capable of good communication without requiring complicated wiring work and without complicating the wiring structure, an electric vehicle equipped with the battery system, a moving body, a power storage device, and a power supply device And to provide electrical equipment.

A battery system according to the present invention includes a first battery module including a plurality of first battery cells and a first circuit board, a communication bus, and a communication device connectable to the communication bus. The board is connected to the first voltage detection unit for detecting the voltage of each first battery cell, the first communication unit connected to the first voltage detection unit and connectable to the communication bus, and the communication bus A possible first termination resistor.

According to the present invention, good communication is possible without requiring complicated wiring work and without complicating the wiring structure.

FIG. 1 is a block diagram showing the configuration of the battery system according to the first embodiment. FIG. 2 is an explanatory view showing the connection of the main circuit board and the plurality of sub circuit boards of FIG. FIG. 3 is a diagram showing connections between a plurality of battery cells and a main circuit board in the battery module. FIG. 4 is a diagram showing the connection between the plurality of battery cells and the sub circuit board in the battery module. FIG. 5 is a block diagram showing the configuration of the low potential side first circuit and the third circuit. FIG. 6 is a block diagram showing the configuration of the second circuit. FIG. 7 is an external perspective view of the battery module. FIG. 8 is a plan view of the battery module. FIG. 9 is an end view of the battery module. FIG. 10 is an external perspective view of the bus bar. FIG. 11 is an external perspective view showing a state where a plurality of bus bars and a plurality of PTC elements are attached to the FPC board. FIG. 12 is a schematic plan view for explaining the connection between the bus bar, the low potential side first circuit, and the high potential side first circuit in the battery module. FIG. 13 is an enlarged plan view showing the voltage / current bus bar and the FPC board. FIG. 14 is a schematic plan view showing one configuration example of the main circuit board and the sub circuit board. FIG. 15 is a schematic plan view showing an example of the arrangement of the battery system. FIG. 16 is a schematic plan view showing the configuration of the contactor of FIG. FIG. 17 is a schematic plan view showing one configuration example of the main circuit board and the sub circuit board in the second embodiment. FIG. 18 is an explanatory view showing the connection of the main circuit board and the plurality of sub circuit boards of FIG. FIG. 19 is a schematic plan view showing an example of the arrangement of the battery system according to the second embodiment. FIG. 20 is a block diagram illustrating a configuration of an electric vehicle including a battery system. FIG. 21 is a block diagram illustrating a configuration of a power supply device including a battery system. FIG. 22 is an external perspective view showing the configuration of the battery module according to the first modification. 23 is a perspective view of the lid member of FIG. 22 as viewed obliquely from below. 24 is a perspective view of the lid member of FIG. 22 as viewed obliquely from above. FIG. 25 is a view of a plurality of bus bars and two FPC boards in the first modification as viewed from above. FIG. 26 is a view of the main circuit board in the first modification as viewed from above. FIG. 27 is a schematic cross-sectional view showing a connection structure between the FPC board and the main circuit board in the first modification. FIG. 28 is an external perspective view showing a configuration of a battery module according to a second modification. FIG. 29 is a perspective view of the lid member of FIG. 28 as viewed obliquely from below. 30 is a perspective view of the lid member of FIG. 28 as viewed obliquely from above. FIG. 31 is a block diagram showing a configuration of a battery system according to another embodiment.

[1] First Embodiment A battery system according to a first embodiment will be described below with reference to the drawings. The battery system according to the present embodiment is mounted on an electric vehicle (for example, an electric automobile) that uses electric power as a drive source.

(1) Configuration of Battery System FIG. 1 is a block diagram showing the configuration of the battery system according to the first embodiment. As shown in FIG. 1, the battery system 500 includes a plurality of

battery modules

100M and 100 and a contactor 102. In the present embodiment, the battery system 500 includes one battery module 100M as a first battery module and three battery modules 100 as second battery modules. The battery system 500 includes a battery ECU (Electronic Control Unit) 101 as a communication device and a control unit.

The plurality of

battery modules

100M and 100 of the battery system 500 are connected to each other through a power line 501. The battery module 100M has a plurality (18 in this example) of battery cells 10 as first battery cells, and a plurality (5 in this example) of thermistors 11. The battery module 100 includes a plurality (18 in this example) of battery cells 10 as second battery cells, and a plurality (5 in this example) of thermistors 11.

In each of the

battery modules

100M and 100, the plurality of battery cells 10 are integrally arranged so as to be adjacent to each other, and are connected in series by a plurality of bus bars 40. Each battery cell 10 is a secondary battery such as a lithium ion battery or a nickel metal hydride battery.

The battery cells 10 arranged at both ends are connected to the power line 501 through the bus bar 40a. Thereby, in the battery system 500, all the battery cells 10 of the plurality of

battery modules

100M and 100 are connected in series.

The battery module 100M has a main circuit board 21 made of a rigid printed circuit board as a first circuit board. The main circuit board 21 includes a plurality of first circuits 30 as first voltage detection units, a second circuit 24 as a first communication unit, and a third circuit as a circuit unit that operates differently from the voltage detection unit. 80 is implemented. In the present embodiment, the circuit unit is a current detection unit. That is, the third circuit 80 that is a circuit unit operates as a functional unit that realizes a function different from that of the voltage detection unit. Each battery module 100 has a sub circuit board 21a made of a rigid printed circuit board as a second circuit board. A plurality of first circuits 30 as second voltage detection units and a second circuit 24 as a second communication unit are mounted on the sub circuit board 21a, and the third circuit 80 is not mounted.

In the main circuit board 21, each first circuit 30 has a function of detecting a terminal voltage of each battery cell 10. The second circuit 24 has a function of performing serial communication with the battery ECU 101 or another battery module 100. The third circuit 80 has a function of detecting the current flowing through the plurality of battery cells 10 in the form of voltage.

The second circuit 24 is connected to the first circuit 30 and the third circuit 80. Thereby, the second circuit 24 acquires the terminal voltage of each battery cell 10 of the battery module 100M and the current flowing through the plurality of battery cells 10. The second circuit 24 is electrically connected to each thermistor 11 of the battery module 100M. Thereby, the second circuit 24 acquires the temperature of the battery module 100M.

In each sub circuit board 21a, each first circuit 30 has a function of detecting a terminal voltage of each battery cell 10. The second circuit 24 has a function of performing serial communication with the battery ECU 101 or

other battery modules

100M and 100.

The second circuit 24 is connected to the first circuit 30. Thereby, the second circuit 24 acquires the terminal voltage of each battery cell 10 of the battery module 100. The second circuit 24 is electrically connected to each thermistor 11 of the battery module 100. Thereby, the second circuit 24 detects the temperature of the battery module 100.

The second circuit 24 of the battery module 100M and the second circuits 24 of the plurality of battery modules 100 are connected to the battery ECU 101 via a serial communication bus 103 that is a communication bus. For example, a terminal resistance RT of 100Ω is attached to both ends of the bus 103. One termination resistor RT is mounted as a first termination resistor on the main circuit board 21 of the battery module 100M. The other termination resistor RT is provided in the battery ECU 101 as a second termination resistor. The temperature of the

battery modules

100M and 100, the terminal voltage of each battery cell 10, and the current flowing through the plurality of battery cells 10 are referred to as cell information. Each second circuit 24 transmits cell information to the battery ECU 101 via the bus 103.

The battery ECU 101 is connected to the non-power battery 12. In the present embodiment, the non-power battery 12 is a lead storage battery. The battery ECU 101 calculates the charge amount of each battery cell 10 based on the cell information given from each second circuit 24. Further, the battery ECU 101 detects an abnormality in each of the

battery modules

100M and 100 based on the cell information given from each second circuit 24. The abnormality of the

battery modules

100M and 100 is, for example, overdischarge, overcharge, or temperature abnormality of the battery cell 10.

The power supply line 501 connected to the highest potential positive electrode and the power supply line 501 connected to the lowest potential negative electrode of the plurality of

battery modules

100M, 100 are connected to a load such as a motor of an electric vehicle via the contactor 102. Connected. When the battery ECU 101 detects an abnormality in the

battery modules

100M and 100, the contactor 102 is turned off. Thereby, when an abnormality occurs, no current flows through the plurality of battery cells 10, and thus abnormal heat generation of the

battery modules

100M and 100 is prevented.

The battery ECU 101 is connected to the main control unit 300 via the bus 104. The battery ECU 101 gives the main control unit 300 the amount of charge of each battery module 100M, 100 (the amount of charge of the battery cell 10). The main control unit 300 controls the power of the electric vehicle (for example, the rotational speed of the motor) based on the amount of charge. Further, when the charging amount of each

battery module

100M, 100 decreases, main controller 300 controls a power generator (not shown) connected to power supply line 501 to charge each

battery module

100M, 100.

FIG. 2 is an explanatory diagram showing connections between the main circuit board 21 and the plurality of sub circuit boards 21a in FIG. Details of the main circuit board 21 and the sub circuit board 21a will be described later with reference to FIG. A plurality of first circuits 30, a common second circuit 24, a third circuit 80, insulating

elements

25 and 27, and

connectors

23a and 23b are mounted on the main circuit board 21. In the present embodiment, two first circuits 30 are mounted on the main circuit board 21. One first circuit 30 is called a low potential side first circuit 30L, and the other first circuit 30 is called a high potential side first circuit 30H. The low-potential-side first circuit 30L and the second circuit 24 are communicatively connected while being electrically insulated from each other by the insulating element 25. The high potential side first circuit 30H is connected to the low potential side first circuit 30L. The third circuit 80 and the second circuit 24 are communicably connected to each other while being electrically insulated from each other by the insulating element 27.

The connector 23a is connected to the second circuit 24 by a pair of connection lines L1 and L2. The connector 23b is connected to the second circuit 24 by a pair of connection lines L3 and L4. The plurality of battery cells 10 of the battery module 100M are used as power sources for the low potential side first circuit 30L, the high potential side first circuit 30H, and the third circuit 80. The non-power battery 12 is used as a power source for the second circuit 24.

The connector 23b of the main circuit board 21 is not connected to either. A termination resistor RT is connected between the pair of connection lines L3 and L4 of the main circuit board 21.

On the sub-circuit board 21a, the low potential side first circuit 30L, the high potential side first circuit 30H, the common second circuit 24, the insulating element 25, and the

connectors

23a and 23b are mounted. The low-potential-side first circuit 30L and the second circuit 24 are communicatively connected while being electrically insulated from each other by the insulating element 25. The high potential side first circuit 30H is connected to the low potential side first circuit 30L.

The connector 23a is connected to the second circuit 24 by a pair of connection lines L1 and L2. The connector 23b is connected to the second circuit 24 by a pair of connection lines L3 and L4. The plurality of battery cells 10 of the battery module 100 are used as a power source for the low potential side first circuit 30L and the high potential side first circuit 30H. The non-power battery 12 is used as a power source for the second circuit 24.

The connector 23a of the main circuit board 21 is connected to the connector 23b of one sub circuit board 21a through a pair of communication lines PA1 and PB1. The connector 23a of one sub circuit board 21a is connected to the connector 23b of another sub circuit board 21a via a pair of communication lines PA2 and PB2. The connector 23a of the other sub circuit board 21a is further connected to the connector 23b of the other sub circuit board 21a through a pair of communication lines PA3 and PB3. Furthermore, connector 23a of other sub circuit board 21a is connected to battery ECU 101 via a pair of communication lines PA4 and PB4.

The battery ECU 101 has a printed circuit board 105 made of a rigid printed circuit board. An MPU (microprocessor) 106, a switch circuit 107, and a connector 108 are mounted on the printed circuit board 105. The printed circuit board 105 is also mounted with other circuits such as a power supply circuit for stepping down the voltage supplied by the non-power battery 12 and a contactor control circuit for turning on and off the contactor 102 of FIG. The connector 108 is connected to the MPU 106 by a pair of connection lines L5 and L6. The MPU 106 and the switch circuit 107 are supplied with power by the non-power battery 12 as indicated by the dotted arrows.

The on / off of the switch circuit 107 is controlled by the MPU 106. When the switch circuit 107 is on, the power from the non-power battery 12 is supplied to the main circuit board 21 and the second circuits 24 of the plurality of sub circuit boards 21a via the switch circuit 107. Thereby, each second circuit 24 operates.

The connector 108 of the printed circuit board 105 is connected to the connector 23a of the sub circuit board 21a through a pair of communication lines PA4 and PB4. Further, for example, a terminal resistance RT of 100Ω is connected between the pair of connection lines L5 and L6. Thereby, MPU106 of battery ECU101 and the 2nd circuit 24 of each

battery module

100M and 100 are connected so that communication is possible. The MPU 106 is communicably connected to the main control unit 300 of the electric automobile 600 via the bus 104.

Note that a communication cable P1 of FIG. 15 described later is formed by the communication lines PA1 and PB1. A communication cable P2 of FIG. 15 described later is formed by the communication lines PA2 and PB2. A communication cable P3 of FIG. 15 described later is formed by the communication lines PA3 and PB3. A communication cable P4 shown in FIG. 15, which will be described later, is formed by the communication lines PA4 and PB4. The bus 103 in FIG. 1 is configured by the communication cables P1 to P4.

FIG. 3 is a diagram showing the connection between the plurality of battery cells 10 and the main circuit board 21 in the battery module 100M. The low potential side first circuit 30L corresponds to half (9 in this example) battery cells 10 (hereinafter referred to as a low potential side battery cell group 10L) of the plurality of battery cells 10 on the low potential side. The high potential side first circuit 30H corresponds to half (9 in this example) of battery cells 10 (hereinafter referred to as a high potential side battery cell group 10H) among the plurality of battery cells 10.

The low potential side first circuit 30L detects the terminal voltage of each of the plurality of battery cells 10 in the low potential side battery cell group 10L. The high potential side first circuit 30H detects the terminal voltage of each of the plurality of battery cells 10 in the high potential side battery cell group 10H.

The low potential side first circuit 30L is electrically connected to the bus bars 40, 40a of the low potential side battery cell group 10L via a plurality of conductor lines 52 and PTC (Positive Temperature Coefficient) elements 60. Similarly, the high potential side first circuit 30H is electrically connected to the bus bars 40, 40a of the high potential side battery cell group 10H via the plurality of conductor lines 52 and the PTC element 60.

Here, the PTC element 60 has a resistance temperature characteristic in which the resistance value rapidly increases when the temperature exceeds a certain value. Therefore, when a short circuit occurs in the low potential side first circuit 30L, the high potential side first circuit 30H, the conductor line 52, or the like, if the temperature of the PTC element 60 rises due to the current flowing through the short circuit path, The resistance value increases. This prevents a large current from flowing through the short circuit path including the PTC element 60.

The negative electrode of the battery cell 10 having the lowest potential of the low potential side battery cell group 10L is the highest of the high potential side battery cell group 10H included in one battery module 100 (see FIG. 4 described later) via the shunt resistor RS. It is connected to the positive electrode of the battery cell 10 having a potential. The shunt resistor RS is an element that generates a voltage corresponding to the current. The third circuit 80 is connected to both ends of the shunt resistor RS via two conductor lines 52.

FIG. 4 is a diagram showing connections between the plurality of battery cells 10 and the sub circuit board 21a in the battery module 100. As shown in FIG. 4, the battery module 100 is the same as the battery module 100M except that the battery module 100 has a sub circuit board 21a instead of the main circuit board 21 of FIG. 3 and does not have the shunt resistor RS of FIG. It has the composition of. The sub circuit board 21a has the same configuration as that of the main circuit board 21 except that the sub circuit board 21a does not have the third circuit 80, the insulating element 27, and the termination resistor RT shown in FIG.

FIG. 5 is a block diagram showing the configuration of the low potential side first circuit 30L and the third circuit 80. As shown in FIG. The low-potential-side first circuit 30L is composed of, for example, an ASIC (Application Specific Integrated Circuit). The detection unit 20 includes a multiplexer 20a, an A / D (analog / digital) converter 20b, and a plurality of differential amplifiers 20c. Each differential amplifier 20c of the detection unit 20 has two input terminals and an output terminal. Each differential amplifier 20c differentially amplifies the voltage input to the two input terminals, and outputs the amplified voltage from the output terminal.

Two input terminals of each differential amplifier 20c are electrically connected between two adjacent bus bars 40 of a plurality of corresponding battery cells 10 or two adjacent bus bars 40, 40a via a conductor line 52 and a PTC element 60. Connected. A voltage between two adjacent bus bars 40 or a voltage between two adjacent bus bars 40 and 40a is differentially amplified by each differential amplifier 20c. The output voltage of each differential amplifier 20c corresponds to the terminal voltage of each battery cell 10 in the low potential side battery cell group 10L. Terminal voltages output from the plurality of differential amplifiers 20c are applied to the multiplexer 20a. The multiplexer 20a sequentially outputs the terminal voltages supplied from the plurality of differential amplifiers 20c to the A / D converter 20b. The A / D converter 20b converts the terminal voltage output from the multiplexer 20a into a digital value.

The communication circuit 32 has a communication function and is communicably connected to the second circuit 24 of FIG. 2 via the insulating element 25 of FIG. In addition, the communication circuit 32 is communicably connected to the high potential side first circuit 30H of FIG. 3 or FIG.

The communication circuit 32 acquires the digital value of the terminal voltage of each battery cell 10 in the low potential side battery cell group 10L from the A / D converter 20b of the detection unit 20. Further, as will be described later, the communication circuit 32 acquires the digital value of the terminal voltage of each battery cell 10 of the high potential side battery cell group 10H from the high potential side first circuit 30H. Further, the communication circuit 32 converts the digital value of the terminal voltage of each battery cell 10 of the low-potential side battery cell group 10L and the digital value of the terminal voltage of each battery cell 10 of the high-potential side battery cell group 10H into the insulating element 25 (FIG. 2) to the second circuit 24.

The third circuit 80 is made of, for example, an ASIC. The third circuit 80 includes a detection unit 81 and a communication circuit 82. The detection unit 81 includes a differential amplifier 81a and an A / D converter 81b. The differential amplifier 81a of the detection unit 81 has two input terminals and an output terminal. The differential amplifier 81a differentially amplifies voltages input to the two input terminals, and outputs the amplified voltage from the output terminal.

The two input terminals of the differential amplifier 81a are electrically connected to both ends of the shunt resistor RS of the battery module 100M (see FIG. 1) via the conductor wire 52. The voltage across the shunt resistor RS is differentially amplified by the differential amplifier 81a. The output voltage of the differential amplifier 81 a is proportional to the current flowing through the plurality of battery cells 10. The differential amplifier 81a outputs a voltage proportional to the current to the A / D converter 81b. The A / D converter 81b converts the voltage output from the differential amplifier 81a into a digital value.

The communication circuit 82 has a communication function and is communicably connected to the second circuit 24 of FIG. 2 via the insulating element 27 of FIG. The communication circuit 82 acquires the digital value of the voltage across the shunt resistor RS from the A / D converter 81b. Further, the communication circuit 82 transmits the digital value of the voltage across the shunt resistor RS to the second circuit 24 via the insulating element 27.

3 and 4 has the same configuration as the low potential side first circuit 30L in FIG. 5 except for the following points. The communication circuit 32 of the high potential side first circuit 30H is communicably connected to the communication circuit 32 (see FIG. 5) of the low potential side first circuit 30L. Thus, the communication circuit 32 of the high potential side first circuit 30H is connected to each battery cell of the high potential side battery cell group 10H via the communication circuit 32 of the low potential side first circuit 30L and the insulating element 25 (see FIG. 2). Ten terminal voltage digital values can be transmitted to the second circuit 24.

FIG. 6 is a block diagram showing a configuration of the second circuit 24. As illustrated in FIG. 6, the second circuit 24 includes a processing unit 241, a storage unit 242, and a communication interface 244. The reference potential (ground potential) of the processing unit 241, the storage unit 242, and the communication interface 244 of the second circuit 24 is held at the lowest potential of the non-power battery 12 of FIG. Each part of the second circuit 24 operates with a voltage output from the power supply circuit 245 (see FIG. 14 described later).

The processing unit 241 includes a CPU (Central Processing Unit), for example, and is connected to the storage unit 242. The processing unit 241 is connected to the plurality of thermistors 11 shown in FIG. Thereby, the processing unit 241 acquires the temperature of the battery module 100.

The processing unit 241 also detects the terminal voltage detected by the detection unit 20 (see FIGS. 3 to 5) of the low potential side first circuit 30L and the high potential side first circuit 30H and the voltage detected by the third circuit 80. It has a function to process information about. In the present embodiment, the processing unit 241 calculates the charge amount of each battery cell 10, the current flowing through the plurality of battery cells 10, and the like. Details of the current calculation will be described later.

The storage unit 242 includes a non-volatile memory such as an EEPROM (electrically erasable and programmable read-only memory). The processing unit 241 includes a communication circuit 246 having a communication function. In the main circuit board 21 (see FIG. 2), the processing unit 241 is communicably connected to the communication circuit 32 (see FIG. 5) of the low potential side first circuit 30L via the insulating element 25 (see FIG. 2). In addition, the communication circuit 32 (see FIG. 6) of the third circuit 80 is communicably connected via the insulating element 27 (see FIG. 2). In the sub circuit board 21a (see FIG. 2), the processing unit 241 is communicably connected to the communication circuit 32 (see FIG. 5) of the low potential side first circuit 30L via the insulating element 25 (see FIG. 2). .

A communication interface 244 is connected to the processing unit 241. The communication interface 244 is an RS-485 standard serial communication interface, for example. The communication interface 244 is connected to the

connectors

23a and 23b in FIG. In the present embodiment, the communication circuit 246 performs serial communication with the battery ECU 101 of FIG. 2 in accordance with the RS-485 standard, but is not limited thereto. For example, the communication circuit 246 may perform serial communication according to other standards with the battery ECU 101, and may perform CAN (Controller Area Network) communication with the battery ECU 101.

Cell information is transmitted to the battery ECU 101 by the communication circuit 246 of the second circuit 24. Thereby, even when the voltage of the battery cell 10 of any one of the

battery modules

100M and 100 of the battery system 500 decreases, the

battery modules

100M and 100 can communicate with the battery ECU 101.

In the present embodiment, the battery ECU 101 of FIG. 2 calculates the charge amount of each battery cell 10 or detects overdischarge, overcharge, temperature abnormality, etc. of the battery cell 10, but is not limited to this. Instead of the battery ECU 101, the second circuit 24 of each of the

battery modules

100M and 100 may calculate the charge amount of each battery cell 10. Further, the second circuit 24 of each of the

battery modules

100M and 100 may detect overdischarge, overcharge, temperature abnormality, and the like of the battery cell 10. In this case, each second circuit 24 provides the battery ECU 101 with a calculation result of the charge amount of each battery cell 10 and detection results such as overdischarge, overcharge and temperature abnormality of the battery cell 10.

(2) Details of Battery Module Details of the

battery modules

100M and 100 will be described. 7 is an external perspective view of the battery module 100M, FIG. 8 is a plan view of the battery module 100M, and FIG. 9 is an end view of the battery module 100M. The battery module 100 has the same configuration as the battery module 100M except that the battery module 100 has a sub circuit board 21a instead of the main circuit board 21 and does not have a shunt resistor RS.

In FIGS. 7 to 9 and FIGS. 11 to 13 and FIGS. 22 to 30 described later, as indicated by arrows X, Y, and Z, three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. Define. In this example, the X direction and the Y direction are directions parallel to the horizontal plane, and the Z direction is a direction orthogonal to the horizontal plane. Further, the upward direction is the direction in which the arrow Z faces.

7 to 9, in the battery module 100M, a plurality of battery cells 10 having a flat, substantially rectangular parallelepiped shape are arranged so as to be arranged in the X direction. In this state, the plurality of battery cells 10 are integrally fixed by a pair of end face frames 92, a pair of upper end frames 93 and a pair of lower end frames 94. As described above, the plurality of battery cells 10, the pair of end face frames 92, the pair of upper end frames 93, and the pair of lower end frames 94 constitute a substantially rectangular parallelepiped battery block 10BB. Battery block 10BB has an upper surface parallel to the XY plane.

The pair of end face frames 92 have a substantially plate shape and are arranged in parallel to the YZ plane. The pair of upper end frames 93 and the pair of lower end frames 94 are arranged so as to extend in the X direction.

Connection portions for connecting the pair of upper end frames 93 and the pair of lower end frames 94 are formed at the four corners of the pair of end face frames 92. In a state where the plurality of battery cells 10 are disposed between the pair of end surface frames 92, the pair of upper end frames 93 are attached to the upper connection portions of the pair of end surface frames 92, and the lower connection of the pair of end surface frames 92 is performed. A pair of lower end frames 94 are attached to the part. Thereby, the some battery cell 10 is fixed integrally in the state arrange | positioned so that it may rank with a X direction. The main circuit board 21 is attached to one end face frame 92 with an interval on the outer surface.

Here, each battery cell 10 has a plus electrode 10a and a minus electrode 10b on the upper surface portion so as to be arranged along the Y direction. Each

electrode

10a, 10b is provided to be inclined so as to protrude upward (see FIG. 9). In the following description, the battery cells 10 adjacent to one end face frame 92 to the battery cells 10 adjacent to the other end face frame 92 are referred to as first to eighteenth battery cells 10.

The plurality of battery cells 10 have a gas vent valve 10v at the center of the upper surface portion. When the pressure inside the battery cell 10 rises to a predetermined value, the gas inside the battery cell 10 is discharged from the gas vent valve 10v. Thereby, the excessive pressure rise inside the battery cell 10 is prevented.

As shown in FIG. 8, in the battery module 100M, each battery cell 10 is arranged so that the positional relationship between the plus electrode 10a and the minus electrode 10b in the Y direction is opposite between the adjacent battery cells 10. Further, one

electrode

10a, 10b of the plurality of battery cells 10 is arranged in a line along the X direction, and the

other electrode

10a, 10b of the plurality of battery cells 10 is arranged in a line along the X direction. Thereby, between two adjacent battery cells 10, the plus electrode 10a of one battery cell 10 and the minus electrode 10b of the other battery cell 10 are close to each other, and the minus electrode 10b of one battery cell 10 and the other electrode are The positive electrode 10a of the battery cell 10 is in close proximity. In this state, the bus bar 40 is attached to two adjacent electrodes. Thereby, the some battery cell 10 is connected in series.

Specifically, a common bus bar 40 is attached to the plus electrode 10 a of the first battery cell 10 and the minus electrode 10 b of the second battery cell 10. A common bus bar 40 is attached to the plus electrode 10 a of the second battery cell 10 and the minus electrode 10 b of the third battery cell 10. Similarly, a common bus bar 40 is attached to the plus electrode 10a of each odd-numbered battery cell 10 and the minus electrode 10b of the even-numbered battery cell 10 adjacent thereto. A common bus bar 40 is attached to the plus electrode 10a of each even-numbered battery cell 10 and the minus electrode 10b of the odd-numbered battery cell 10 adjacent thereto.

Further, a bus bar 40a for connecting a power line 501 (see FIG. 1) from the outside is attached to the negative electrode 10b of the first battery cell 10 and the positive electrode 10a of the 18th battery cell 10, respectively. In battery module 100M, power line 501 is connected to bus bar 40a attached to negative electrode 10b of first battery cell 10 via shunt resistor RS. On the other hand, in the battery module 100, the power line 501 is directly connected to the bus bar 40a attached to the negative electrode 10b of the first battery cell 10.

A long flexible printed circuit board (hereinafter abbreviated as FPC board) 50 extending in the X direction is commonly connected to the plurality of bus bars 40 on one end side of the plurality of battery cells 10 in the Y direction. . Similarly, a long FPC board 50 extending in the X direction is commonly connected to the plurality of

bus bars

40 and 40a on the other end side of the plurality of battery cells 10 in the Y direction.

The FPC board 50 has a configuration in which a plurality of

conductor wires

51 and 52 shown in FIG. 12, which will be described later, are mainly formed on an insulating layer, and has flexibility and flexibility. For example, polyimide is used as the material of the insulating layer constituting the FPC board 50, and copper is used as the material of the

conductor wires

51 and 52, for example. On the FPC board 50, the PTC elements 60 are arranged so as to be close to the bus bars 40, 40a.

Each FPC board 50 is folded at a right angle toward the inside at the upper end portion of the end face frame 92 (end face frame 92 to which the main circuit board 21 is attached), and further folded downward to be connected to the main circuit board 21. .

(3) Structure of Bus Bar and FPC Board Next, details of the structure of the bus bars 40 and 40a and the FPC board 50 will be described. Hereinafter, the bus bar 40 for connecting the plus electrode 10a and the minus electrode 10b of the two adjacent battery cells 10 is referred to as a bus bar 40 for two electrodes, and the plus electrode 10a or the minus electrode 10b of one battery cell 10 is called. The bus bar 40a for connecting the power line 501 and the power line 501 is referred to as a one-electrode bus bar 40a.

FIG. 10A is an external perspective view of the bus bar 40 for two electrodes, and FIG. 10B is an external perspective view of the bus bar 40a for one electrode.

As shown in FIG. 10A, the two-electrode bus bar 40 includes a base portion 41 having a substantially rectangular shape and a pair of attachment pieces 42 that are bent and extended from one side of the base portion 41 to the one surface side. A pair of electrode connection holes 43 are formed in the base portion 41.

As shown in FIG. 10B, the bus bar 40a for one electrode includes a base portion 45 having a substantially square shape and a mounting piece 46 that is bent and extends from one side of the base portion 45 to one side thereof. An electrode connection hole 47 is formed in the base portion 45.

In the present embodiment, the bus bars 40, 40a have a configuration in which, for example, nickel plating is applied to the surface of tough pitch copper.

FIG. 11 is an external perspective view showing a state in which a plurality of bus bars 40, 40a and a plurality of PTC elements 60 are attached to the FPC board 50. FIG. As shown in FIG. 11, mounting

pieces

42 and 46 of a plurality of

bus bars

40 and 40a are attached to the two FPC boards 50 at predetermined intervals along the X direction. Further, the plurality of PTC elements 60 are respectively attached to the two FPC boards 50 at the same interval as the interval between the plurality of bus bars 40, 40a. A member in which the FPC board 50 and the plurality of bus bars 40, 40a are integrally coupled in this manner is hereinafter referred to as a wiring member 110.

When the

battery modules

100M and 100 are manufactured, the plurality of bus bars 40, as described above are formed on the plurality of battery cells 10 integrally fixed by the end face frame 92, the upper end frame 93, and the lower end frame 94 of FIG. Two FPC boards 50 to which 40a and a plurality of PTC elements 60 are attached are attached. A shunt resistor RS is attached to one of the two FPC boards 50 attached to the plurality of battery cells 10 of the battery module 100M.

At the time of attachment, the plus electrode 10a and the minus electrode 10b of the adjacent battery cell 10 are fitted into the electrode connection holes 43 and 47 formed in the bus bars 40 and 40a. Male screws are formed on the plus electrode 10a and the minus electrode 10b. Nuts (not shown) are screwed into male threads of the plus electrode 10a and the minus electrode 10b in a state where the bus bars 40, 40a are fitted in the plus electrode 10a and the minus electrode 10b of the adjacent battery cell 10.

Thus, the plurality of bus bars 40, 40a are attached to the plurality of battery cells 10, and the FPC board 50 is held in a substantially horizontal posture by the plurality of bus bars 40, 40a.

(4) Connection between bus bar and low potential side first circuit and high potential side first circuit Next, connection between

bus bars

40, 40a, low potential side first circuit 30L and high potential side first circuit 30H will be described. . FIG. 12 is a schematic plan view for explaining the connection between the bus bars 40, 40a, the low potential side first circuit 30L, and the high potential side first circuit 30H in the battery module 100M. Except for the point that battery module 100 has sub circuit board 21a instead of main circuit board 21 and does not have shunt resistor RS, bus bars 40 and 40a, low potential side first circuit 30L and high potential in battery module 100 The connection with the first side circuit 30H is the same as the connection between the bus bars 40, 40a, the low potential side first circuit 30L, and the high potential side first circuit 30H in the battery module 100M.

As shown in FIG. 12, the FPC board 50 is provided with a plurality of

conductor lines

51 and 52 so as to correspond to the plurality of

bus bars

40 and 40a. Each conductor wire 51 is provided so as to extend in parallel in the Y direction between the mounting

pieces

42 and 46 of the bus bars 40 and 40a and the PTC element 60 disposed in the vicinity of the bus bars 40 and 40a. Are provided so as to extend parallel to the X direction between the PTC element 60 and one end of the FPC board 50.

One end of each conductor wire 51 is provided so as to be exposed on the lower surface side of the FPC board 50. One end of each conductor wire 51 exposed on the lower surface side is electrically connected to the mounting

pieces

42 and 46 of each

bus bar

40 and 40a, for example, by soldering or welding. Thereby, the FPC board 50 is fixed to each

bus bar

40, 40a.

The other end of each conductor line 51 and one end of each conductor line 52 are provided so as to be exposed on the upper surface side of the FPC board 50. A pair of terminals (not shown) of the PTC element 60 are connected to the other end of each conductor wire 51 and one end of each conductor wire 52 by, for example, soldering.

The main circuit board 21 is provided with a plurality of connection terminals 22 corresponding to the plurality of conductor lines 52 of the FPC board 50. The plurality of connection terminals 22, the low potential side first circuit 30 </ b> L, and the high potential side first circuit 30 </ b> H are electrically connected on the main circuit board 21. The other end of each conductor wire 52 of the FPC board 50 is connected to the corresponding connection terminal 22 by, for example, soldering or welding. The connection between the main circuit board 21 and the FPC board 50 is not limited to soldering or welding, and may be performed using a connector.

In this way, the bus bars 40, 40a are electrically connected to the low potential side first circuit 30L and the high potential side first circuit 30H via the PTC element 60. Thereby, the terminal voltage of each battery cell 10 is detected.

In the present embodiment, the shunt resistor RS of the battery module 100M is provided in the bus bar 40 of FIG. The bus bar 40 provided with the shunt resistor is referred to as a voltage / current bus bar 40y. FIG. 13 is an enlarged plan view showing the voltage / current bus bar 40y and the FPC board 50. FIG.

As shown in FIG. 13, on the base part 41 of the voltage / current bus bar 40y, a pair of solder patterns H1 and H2 are formed in parallel to each other at regular intervals. The solder pattern H1 is disposed between the two electrode connection holes 43 in the vicinity of one electrode connection hole 43, and the solder pattern H2 is disposed between the electrode connection holes 43 in the vicinity of the other electrode connection hole 43. The resistance formed between the solder patterns H1 and H2 in the voltage / current bus bar 40y becomes a shunt resistance for current detection.

The solder pattern H1 of the voltage / current bus bar 40y is connected to one input terminal of the differential amplifier 81a (see FIG. 6) of the third circuit 80 via the conductor line 51, the conductor line 52, and the connection terminal 22 of the main circuit board 21. Connected. Similarly, the solder pattern H2 of the voltage / current bus bar 40y is input to the other input of the differential amplifier 81a (see FIG. 6) of the third circuit 80 via the conductor wire 51, the conductor wire 52, and the connection terminal 22 of the main circuit board 21. Connected to the terminal. Thereby, the third circuit 80 detects a voltage between the solder patterns H1 and H2. The voltage between the solder patterns H1 and H2 detected by the third circuit 80 is applied to the second circuit 24 of FIG.

Also, the solder pattern H1 is connected to a bus bar 40a (see FIGS. 3 and 8) attached to the negative electrode 10b of the first battery cell 10 of the battery module 100M via a conductor line on the FPC board 50. The solder pattern H2 is connected to the bus bar 40a (see FIGS. 4 and 8) attached to the plus electrode 10a of the 18th battery cell 10 of the adjacent battery module 100 via the power line 501 of FIG. Thereby, the battery module 100M and the adjacent battery module 100 are connected in series via the shunt resistor RS of the voltage / current bus bar 40y.

In the present embodiment, the value of the shunt resistance RS between the solder patterns H1 and H2 in the voltage / current bus bar 40y is stored in advance in the storage unit 242 of the second circuit 24 in FIG. The processing unit 241 of the second circuit 24 in FIG. 6 divides the voltage between the solder patterns H1 and H2 given from the third circuit 80 by the value of the shunt resistor RS stored in the storage unit 242 to thereby obtain a voltage / current bus bar. The value of the current flowing through 40y is calculated. In this way, the value of the current flowing through the plurality of battery cells 10 is detected.

(5) One Configuration Example of Main Circuit Board and Sub Circuit Board Next, one configuration example of the main circuit board 21 and the sub circuit board 21a will be described. FIG. 14A is a schematic plan view showing a configuration example of the main circuit board 21, and FIG. 14B is a schematic plan view showing a configuration example of the sub circuit board 21a.

As shown in FIG. 14A, the main circuit board 21 includes a low potential side first circuit 30L, a high potential side first circuit 30H, a second circuit 24, a third circuit 80, insulating

elements

25 and 27, a power source. A circuit 245,

connectors

23a, 23b, and 23c and a terminating resistor RT are mounted. A plurality of connection terminals 22 are formed on the main circuit board 21. The main circuit board 21 includes a first mounting region 10G, a second mounting region 12G, and a strip-shaped insulating region 26.

The second mounting region 12G is formed at one corner of the main circuit board 21. The insulating region 26 is formed so as to extend along the second mounting region 12G. The first mounting region 10G is formed in the remaining part of the main circuit board 21. The first mounting region 10G and the second mounting region 12G are separated from each other by the insulating region 26. Thereby, the first mounting region 10G and the second mounting region 12G are electrically insulated by the insulating region 26.

In the first mounting region 10G, the low potential side first circuit 30L, the high potential side first circuit 30H, and the third circuit 80 are mounted, and a plurality of connection terminals 22 are formed. The low potential side first circuit 30L, the high potential side first circuit 30H and the plurality of connection terminals 22 are electrically connected to each other on the main circuit board 21 by connection lines. The third circuit 80 and the plurality of connection terminals 22 are electrically connected on the main circuit board 21 by connection lines.

As a power source for the low potential side first circuit 30L, the high potential side first circuit 30H, and the third circuit 80, a plurality of battery cells 10 (see FIG. 1) of the battery module 100M are connected to the low potential side first circuit 30L, the high potential side. The first circuit 30H and the third circuit 80 are connected. The low potential side first circuit 30L is supplied with power from the plurality of battery cells 10 of the low potential side battery cell group 10L of FIG. Electric power is supplied to the high potential side first circuit 30H from the plurality of battery cells 10 in the high potential side battery cell group 10H of FIG. Electric power is supplied to the third circuit 80 from the plurality of battery cells 10 in the low potential side battery cell group 10L of FIG.

The ground pattern GND1L is formed around the mounting region of the low potential side first circuit 30L except for the mounting region of the low potential side first circuit 30L and the connection line forming region. The ground pattern GND1L is held at the lowest potential of the plurality of battery cells 10 in the low potential side battery cell group 10L. A ground pattern GND1H is formed around the mounting region of the high potential side first circuit 30H, except for the mounting region of the high potential side first circuit 30H and the connection line forming region. The ground pattern GND1H is held at the lowest potential of the plurality of battery cells 10 in the high potential side battery cell group 10H. A ground pattern GND3 is formed around the mounting region of the third circuit 80 except for the mounting region of the third circuit 80 and the connection line forming region. The ground pattern GND3 is held at the lowest potential of the plurality of battery cells 10 in the low potential side battery cell group 10L.

The second circuit 24, the power supply circuit 245, and the connectors 23a to 23c are mounted in the second mounting area 12G. The second circuit 24 and the connector 23a are electrically connected on the main circuit board 21 by a pair of connection lines L3 and L4. The second circuit 24 and the connector 23b are electrically connected on the main circuit board 21 by a pair of connection lines L1 and L2. The power supply circuit 245 and the connector 23c are electrically connected to each other on the main circuit board 21 by connection lines. The insulating element 25 and the power supply circuit 245 are electrically connected on the main circuit board 21 by connection lines. A termination resistor RT is mounted between the pair of connection lines L3 and L4.

As a power source for the second circuit 24, the non-power battery 12 (see FIG. 2) provided in the electric vehicle is connected to the second circuit 24 via the switch circuit 107, the connector 23c, and the power circuit 245 of FIG. The power supply circuit 245 steps down the voltage supplied from the non-power battery 12 and supplies it to the power supply circuit 245. A ground pattern GND2 is formed in the second mounting region 12G except for the mounting region of the second circuit 24, the power supply circuit 245 and the connectors 23a to 23c and the formation region of a plurality of connection lines. The ground pattern GND2 is held at the reference potential (ground potential) of the non-power battery 12.

The insulating element 25 is mounted so as to straddle the insulating region 26. The insulating element 25 transmits a signal between the first circuit 30L on the low potential side and the second circuit 24 while electrically insulating the ground pattern GND1L and the ground pattern GND2 from each other. The insulating element 27 is mounted so as to straddle the insulating region 26. The insulating element 27 transmits a signal between the third circuit 80 and the second circuit 24 while electrically insulating the ground pattern GND3 and the ground pattern GND2. As the insulating

elements

25 and 27, for example, a digital isolator or a photocoupler can be used. In the present embodiment, digital isolators are used as the insulating

elements

25 and 27.

As shown in FIG. 14B, the sub circuit board 21a has the same configuration as the main circuit board 21 except that it does not have the third circuit 80, the insulating element 27, the termination resistor RT, and the ground pattern GND3. Have. The low-potential side first circuit 30L, the high-potential side first circuit 30H, the second circuit 24, the insulating element 25, the power supply circuit 245, the connectors 23a to 23c, and the connection terminals 22 on the sub circuit board 21a are connected to the main circuit board. 21 is the same as the connection of the low potential side first circuit 30L, the high potential side first circuit 30H, the second circuit 24, the insulating element 25, the power supply circuit 245, the connectors 23a to 23c, and the connection terminal 22.

Thus, the low potential side first circuit 30L and the second circuit 24 are connected so as to be able to communicate while being electrically insulated by the insulating element 25. The high potential side first circuit 30H and the second circuit 24 are connected to each other via the low potential side first circuit 30L while being electrically insulated. Further, the third circuit 80 and the second circuit 24 are communicably connected while being electrically insulated by the insulating element 27. Thereby, a plurality of battery cells 10 can be used as the power source for the low potential side first circuit 30L, the high potential side first circuit 30H, and the third circuit 80, and the non-power battery 12 ( FIG. 2) can be used. As a result, the second circuit 24 can be stably operated independently from the low potential side first circuit 30L, the high potential side first circuit 30H, and the third circuit 80.

(6) Example of Arrangement of Battery System FIG. 15 is a schematic plan view showing an example of arrangement of the battery system 500. As shown in FIG. 15, the battery system 500 further includes an HV (High Voltage) connector 520 and a service plug 530 in addition to the battery module 100M, the three battery modules 100, the battery ECU 101, and the contactor 102 of FIG. .

In the following description, the three battery modules 100 are referred to as

battery modules

100a, 100b, and 100c, respectively. Of the pair of end face frames 92 provided in the battery module 100M, the end face frame 92 to which the main circuit board 21 is not attached is called an end face frame 92a, and the end face frame 92 to which the main circuit board 21 is attached is called an end face frame 92b. Similarly, of the pair of end face frames 92 provided in each of the battery modules 100a to 100c, the end face frame 92 to which the sub circuit board 21a is not attached is called an end face frame 92a, and the end face frame 92 to which the sub circuit board 21a is attached is the end face This is called a frame 92b. In FIG. 15, the end face frame 92b is hatched.

Battery modules 100a to 100c, 100M, battery ECU 101, contactor 102, HV connector 520 and service plug 530 are housed in box-shaped casing 550.

Casing 550 has

side portions

550a, 550b, 550c, and 550d. The

side surface portions

550a and 550c are parallel to each other, and the

side surface portions

550b and 550d are parallel to each other and perpendicular to the

side surface portions

550a and 550c.

In the casing 550, the battery modules 100a and 100b are arranged so as to be arranged at a predetermined interval. In this case, the battery modules 100a and 100b are arranged so that the end face frame 92b of the battery module 100a and the end face frame 92a of the battery module 100b face each other. The

battery modules

100c and 100M are arranged so as to be arranged at a predetermined interval. In this case, the

battery modules

100c and 100M are arranged so that the end face frame 92a of the battery module 100c and the end face frame 92b of the battery module 100M face each other. Hereinafter, the battery modules 100a and 100b arranged so as to be aligned with each other are referred to as a module row T1, and the

battery modules

100c and 100M arranged so as to be aligned with each other are referred to as a module row T2.

In the casing 550, the module row T1 is arranged along the side surface portion 550a, and the module row T2 is arranged in parallel with the module row T1. The end surface frame 92a of the battery module 100a in the module row T1 is directed to the side surface portion 550d, and the end surface frame 92b of the battery module 100b is directed to the side surface portion 550b. Further, the end surface frame 92b of the battery module 100c in the module row T2 is directed to the side surface portion 550d, and the end surface frame 92a of the battery module 100M is directed to the side surface portion 550b.

In the region between the module row T1 and the side surface portion 550a, the service plug 530, the battery ECU 101, the HV connector 520, and the contactor 102 are arranged in this order from the side surface portion 550d to the side surface portion 550b.

In each of the battery modules 100a to 100c, 100M, the potential of the positive electrode 10a (see FIG. 8) of the battery cell 10 (18th battery cell 10) adjacent to the end face frame 92a is the highest, and the battery adjacent to the end face frame 92b. The potential of the negative electrode 10b (see FIG. 8) of the cell 10 (first battery cell 10) is the lowest. Hereinafter, the positive electrode 10a having the highest potential in each of the battery modules 100a to 100c and 100M is referred to as a high potential electrode 10A, and the negative electrode 10b having the lowest potential in each of the battery modules 100a to 100c and 100M is referred to as a low potential electrode 10B.

The low potential electrode 10B of the battery module 100a and the high potential electrode 10A of the battery module 100b are connected to each other via the power supply line Q7 as the power supply line 501 in FIG. The shunt resistor RS (see FIG. 1) connected to the high potential electrode 10A of the battery module 100c and the low potential electrode 10B of the battery module 100M is connected to each other via the power line Q8 as the power line 501 in FIG.

The high potential electrode 10A of the battery module 100a is connected to the service plug 530 via the power supply line Q1 as the power supply line 501 of FIG. 1, and the low potential electrode 10B of the battery module 100c is connected via the power supply line Q2 as the power supply line 501 of FIG. To the service plug 530. When the service plug 530 is turned on, the battery modules 100a to 100c and 100M are connected in series. In this case, the potential of the high potential electrode 10A of the battery module 100M is the highest, and the potential of the low potential electrode 10B of the battery module 100b is the lowest.

The service plug 530 has a built-in fuse. The service plug 530 is turned off by an operator during maintenance of the battery system 500, for example. When the service plug 530 is turned off, the series circuit composed of the battery modules 100a and 100b and the series circuit composed of the

battery modules

100c and 100M are electrically separated. In this case, the total voltage of the series circuit including the battery modules 100a and 100b is equal to the total voltage of the series circuit including the

battery modules

100c and 100M. This prevents a high voltage from being generated in the battery system 500 during maintenance.

The low potential electrode 10B of the battery module 100b is connected to the contactor 102 via the power supply line Q3 as the power supply line 501 of FIG. 1, and the high potential electrode 10A of the battery module 100M is connected via the power supply line Q4 as the power supply line 501 of FIG. Connected to contactor 102. Contactor 102 is connected to HV connector 520 via power supply lines Q5 and Q6 as power supply line 501 in FIG. The HV connector 520 is connected to a load such as a motor of an electric vehicle.

In the state where the contactor 102 is turned on, the battery module 100b is connected to the HV connector 520 via the power supply lines Q3 and Q6, and the battery module 100M is connected to the HV connector 520 via the power supply lines Q4 and Q5. Thereby, electric power is supplied from the battery modules 100a to 100c and 100M to the load.

When the contactor 102 is turned off, the connection between the battery module 100b and the HV connector 520 and the connection between the battery module 100M and the HV connector 520 are cut off.

The connector 23a of the sub circuit board 21a of the battery module 100a and the connector 23b of the sub circuit board 21a of the battery module 100b are connected to each other via a communication cable P3. The connector 23b of the sub circuit board 21a of the battery module 100a and the connector 23a of the sub circuit board 21a of the battery module 100c are connected to each other via the communication cable P2. The connector 23b of the sub circuit board 21a of the battery module 100c and the connector 23a of the main circuit board 21 of the battery module 100M are connected to each other via the communication cable P1. The connector 23a of the sub circuit board 21a of the battery module 100b is connected to the battery ECU 101 via the communication cable P4. The bus 103 in FIG. 1 is configured by the communication cables P1 to P4.

As described above, cell information is detected by the second circuit 24 (see FIG. 6) in each of the battery modules 100a to 100c and 100M. The cell information detected by the second circuit 24 of the battery module 100a is given to the battery ECU 101 via the communication cables P3 and P4. The cell information detected by the second circuit 24 of the battery module 100b is given to the battery ECU 101 via the communication cable P4. The cell information detected by the second circuit 24 of the battery module 100c is given to the battery ECU 101 via the communication cables P2, P3, P4. Cell information detected by the second circuit 24 of the battery module 100M is given to the battery ECU 101 via the communication cables P1, P2, P3, and P4.

FIG. 16 is a schematic plan view showing the configuration of the contactor 102 of FIG. As shown in FIG. 16, contactor 102 includes switching elements SW1, SW2, SW3 and a resistor R. The switching element SW1 has terminals t1 and t2, the switching element SW2 has terminals t3 and t4, and the switching element SW3 has terminals t5 and t6. The power supply line Q4 is connected to the terminal t1, and the power supply line Q4 is connected to the terminal t3. A power supply line Q3 is connected to the terminal t5. A power supply line Q5 is connected to the terminal t2 via a resistor R, and a power supply line Q5 is connected to the terminal t4. A power supply line Q6 is connected to the terminal t6.

Switching element SW1 is turned on and off based on the control of battery ECU 101 in FIG. Switching element SW2 is turned on and off based on the control of battery ECU 101. Switching element SW3 is turned on and off based on the control of battery ECU 101.

When the battery system 500 in FIG. 15 starts to supply power to the load of the electric vehicle via the HV connector 520, the battery ECU 101 turns on the switching element SW1 and the switching element SW3. In this case, electric power is supplied from the battery system 500 to the load of the electric vehicle via the resistor R. Thereafter, the battery ECU 101 turns off the switching element SW1 and turns on the switching element SW2. Thereby, when starting supply of electric power to the load of an electric vehicle, it can prevent that an excessive inrush current flows into load.

(7) Effects of Embodiment In the above embodiment, the termination resistor RT is mounted on the main circuit board 21 of the battery module 100M. A termination resistor RT is mounted on the printed circuit board 105 of the battery ECU 101.

The terminal resistor RT of the main circuit board 21 is connected to the bus 103 by connecting the communication cable P1 to the connector 23a of the main circuit board 21. Thereby, impedance matching of one end of the bus 103 can be performed with a simple configuration. Similarly, the termination resistor RT of the printed circuit board 105 is connected to the bus 103 by connecting the communication cable P4 to the connector 108 of the printed circuit board 105. Thereby, impedance matching of the other end of the bus 103 can be performed with a simple configuration.

As a result, good communication can be performed between the

battery modules

100M and 100 and the battery ECU 101 without requiring complicated wiring work and without complicating the wiring structure.

Further, the third circuit 80 and the insulating element 27 are provided on the main circuit board 21. In this case, the voltage across the shunt resistor RS is detected by the third circuit 80. The voltage across the shunt resistor RS is proportional to the current flowing through the plurality of battery cells 10. Thereby, it becomes possible to calculate the current flowing through the plurality of battery cells 10 based on the voltage across the shunt resistor RS with a simple configuration. Further, the calculated current is transmitted to the second circuit 24 of the battery module 100 or the battery ECU 101 via the bus 103.

In this configuration, it is not necessary to provide the third circuit 80 on the sub circuit board 21a. Thereby, the structure of the sub circuit board 21a can be simplified. Further, it is not necessary to separately provide a current detection device in the battery system 500. As a result, it is possible to detect the current flowing through the plurality of battery cells 10 while suppressing an increase in cost.

Thus, since the termination resistor RT and the third circuit 80 are provided on the main circuit board 21, it is not necessary to provide the termination resistor RT and the third circuit 80 on the sub circuit board 21a. That is, three types of circuit boards are prepared: a circuit board on which the first circuit 30 and the termination resistor RT are provided, a circuit board on which the first circuit 30 and the third circuit 80 are provided, and a circuit board on which only the first circuit 30 is provided. There is no need. The battery system 500 can be configured by two types of circuit boards, that is, the main circuit board 21 provided with the first circuit 30, the termination resistor RT and the third circuit 80, and the sub circuit board 21a provided only with the first circuit 30. Thereby, the number of types of circuit boards of the battery system 500 can be reduced. As a result, the production yield of the battery system 500 can be improved and the production cost can be reduced.

(8) Features of Embodiment As described above, the battery system according to the present embodiment includes a first battery module including a plurality of first battery cells and a first circuit board, and a communication bus. The first circuit board includes a first voltage detection unit that detects a voltage of each first battery cell, a first communication unit that is connected to the first voltage detection unit and that can be connected to a communication bus, And a first termination resistor connectable to the communication bus.

In this battery system, the voltage of each first battery cell of the first battery module is detected by the first voltage detector of the first circuit board. The detected voltage of each first battery cell can be transmitted to an external device by the first communication unit of the first circuit board.

The first termination resistor of the first circuit board is connected to the communication bus. Thereby, impedance matching of the communication bus is performed. As a result, good communication can be performed between the first battery module and the external device without requiring complicated wiring work and without complicating the wiring structure.

The battery system according to the present embodiment further includes a communication device that can be connected to the communication bus. In this case, good communication can be performed between the first battery module and the communication device without requiring complicated wiring work and without complicating the wiring structure.

The battery system according to the present embodiment further includes a second battery module including a plurality of second battery cells and a second circuit board, and the second circuit board is provided for each second battery cell. The communication device includes a second voltage detection unit that detects the voltage and a second communication unit that is connected to the second voltage detection unit and is connectable to the communication bus. A control unit that performs an operation related to the control of the first and second battery modules. That is, the communication device operates as a control unit including a second termination resistor connectable to the communication bus and having a function related to the control of the first and second battery modules.

In this case, the voltage of each second battery cell of the second battery module is detected by the second voltage detection unit of the second circuit board. The detected voltage of each second battery cell can be transmitted to the first communication unit, the control unit, or the external device of the first battery module via the communication bus by the second communication unit of the second circuit board. It is.

The control unit can communicate with the first communication unit of the first battery module and the second communication unit of the second battery module via the communication bus. Thus, the control unit can control the first battery module based on the voltage detected by the first voltage detection unit, and can control the first battery module based on the voltage detected by the second voltage detection unit. 2 battery modules can be controlled.

Also, the second termination resistor of the control unit is connected to the communication bus. Thereby, impedance matching of the communication bus is performed. As a result, good communication can be performed between the first and second battery modules and the control unit without requiring complicated wiring work and without complicating the wiring structure.

In the present embodiment, the first circuit board further includes a circuit unit that performs an operation different from that of the first voltage detection unit. That is, the circuit unit operates as a functional unit that realizes a function different from that of the first voltage detection unit. In this case, it is not necessary to provide a circuit portion on the second circuit board. Thereby, the structure of the second circuit board can be simplified.

In the present embodiment, the circuit unit includes a current detection unit configured to detect information related to the current flowing through the plurality of first battery cells and to transmit the detected information through the communication bus. In this case, it is not necessary to separately provide a current detection device in the battery system. As a result, it is possible to detect the current flowing through the plurality of first battery cells while suppressing an increase in cost.

In the present embodiment, the first battery module further includes an element that generates a voltage corresponding to the current flowing through the plurality of first battery cells, and the current detection unit of the first circuit board includes the element. By detecting the generated voltage, the current flowing through the plurality of first battery cells is detected in the form of voltage as information.

In this case, the current detection unit of the first circuit board detects the voltage corresponding to the current flowing through the plurality of first battery cells, and the detected voltage is the second of the second battery module via the communication bus. To the communication unit or external device. Thereby, it is possible to calculate the current flowing through the plurality of first battery cells based on the voltage generated in the element with a simple configuration.

In the present embodiment, the communication bus includes a communication cable, and the first circuit board further includes a connector that is electrically connected to the first communication unit and is connectable to the communication cable. The termination resistor is electrically connected to the connector.

In this case, the first termination resistor is electrically connected to the communication bus by connecting the communication cable to the connector of the first circuit board. Thereby, impedance matching of the communication bus can be performed with a simple configuration.

[2] Second Embodiment A battery system 500 according to a second embodiment will be described while referring to differences from the battery system 500 according to the first embodiment.

FIG. 17A is a schematic plan view showing a configuration example of the main circuit board in the second embodiment, and FIG. 17B shows a configuration example of the sub circuit board in the second embodiment. It is a schematic plan view to show.

As shown in FIG. 17A, the main circuit board 21b in the present embodiment is mounted with a power supply circuit 243, which is a circuit unit that performs an operation different from the voltage detection unit, instead of the power supply circuit 245. Except that the connector 23d is further mounted on the second mounting region 12G, it has the same configuration as the main circuit board 21 of FIG. The power supply circuit 243 and the connector 23c are electrically connected by a connection line on the main circuit board 21b, and the power supply circuit 243 and the connector 23d are electrically connected by a connection line on the main circuit board 21b.

The voltage input to the connector 23 c is stepped down by the power supply circuit 243 and applied to the second circuit 24. Thereby, the second circuit 24 operates. In addition, the voltage input to the connector 23c is stepped down by the power supply circuit 243 and applied to the connector 23d. Thereby, the voltage stepped down by the power supply circuit 243 is output from the connector 23d.

As shown in FIG. 17B, the sub circuit board 21c in the present embodiment is similar to that shown in FIG. 14 except that the power supply circuit 245 is not mounted and the connector 23d is further mounted in the second mounting region 12G. It has the same configuration as the sub circuit board 21a of (b). The connector 23c and the second circuit 24 are electrically connected by a connection line on the sub circuit board 21c, and the connector 23c and the connector 23d are electrically connected by a connection line on the sub circuit board 21c.

The voltage input to the connector 23c is applied to the second circuit 24. Thereby, the second circuit 24 operates. The voltage input to the connector 23c is given to the connector 23d. Thereby, the voltage input to the connector 23c is output from the connector 23d.

FIG. 18 is an explanatory view showing the connection of the main circuit board 21b and the plurality of sub circuit boards 21c of FIG. 17, and FIG. It is. FIG. 18 shows a simplified configuration of the main circuit board 21b and the sub circuit board 21c. For example, in the main circuit board 21b in FIG. 18, the connection terminals 22 and the insulating regions 26 in FIG. 17A are not shown. Further, in the sub circuit board 21c of FIG. 18, the connection terminals 22 and the insulating regions 26 of FIG. 17B are not shown.

As shown in FIGS. 18 and 19, in the present embodiment, switch circuit 107 of battery ECU 101 and connector 23c of main circuit board 21b of battery module 100M are connected to each other via power line S1. Connector 23d of main circuit board 21b of battery module 100M and connector 23c of sub circuit board 21c of battery module 100c are connected to each other via power line S2. The connector 23d of the sub circuit board 21c of the battery module 100c and the connector 23c of the sub circuit board 21c of the battery module 100a are connected to each other via the power line S3. The connector 23d of the sub circuit board 21c of the battery module 100a and the connector 23c of the sub circuit board 21c of the battery module 100b are connected to each other via the power line S4.

Thereby, the voltage of the non-power battery 12 is applied to the power supply circuit 243 of the battery module 100M through the switch circuit 107 of the battery ECU 101. The voltage of the non-power battery 12 is stepped down by the power supply circuit 243 and applied to the second circuit 24 of the battery module 100M and also to the second circuits 24 of the battery modules 100a to 100c. That is, the power supply circuit 243 that is a circuit unit operates as a functional unit that realizes a function different from that of the voltage detection unit.

As described above, in the present embodiment, the power supply circuit 243 of the main circuit board 21 of the battery module 100M supplies power to the second circuits 24 of the battery modules 100M and 100a to 100c. In this configuration, it is not necessary to provide the power circuit 243 and the power circuit 245 of FIG. 14B on the sub circuit board 21c. Thereby, the structure of the sub circuit board 21a can be further simplified. As a result, each second circuit 24 can be stably operated by the non-power battery 12 while suppressing an increase in cost.

[3] Third Embodiment Hereinafter, an electric vehicle and other moving bodies will be described as moving bodies according to a third embodiment. The electric vehicle according to the present embodiment includes battery system 500 according to the first or second embodiment. In the following, an electric vehicle will be described as an example of an electric vehicle.

(1) Configuration and Operation of Electric Vehicle FIG. 20 is a block diagram illustrating a configuration of an electric vehicle including the battery system 500. As shown in FIG. 20, electric vehicle 600 according to the present embodiment includes a vehicle body 610 as a moving main body. The vehicle body 610 includes the non-power battery 12 of FIG. 1, the main control unit 300 and the battery system 500, the power conversion unit 601, the motor 602, the drive wheels 603, the accelerator device 604, the brake device 605, and the rotation speed sensor 606. The motor 602 and the drive wheel 603 are power sources. When motor 602 is an alternating current (AC) motor, power conversion unit 601 includes an inverter circuit.

In the present embodiment, the non-power battery 12 is connected to the battery system 500. The battery system 500 is connected to the motor 602 via the power conversion unit 601 and also connected to the main control unit 300. As described above, the main controller 300 has the amount of charge of each battery cell 10 (see FIG. 1) and the value of the current flowing through the plurality of battery cells 10 from the battery ECU 101 (see FIG. 1) constituting the battery system 500. Given.

Accelerator device 604, brake device 605 and rotation speed sensor 606 are connected to main controller 300. The main control unit 300 includes, for example, a CPU and a memory, or a microcomputer. A non-power battery 12 is connected to the main controller 300. The electric power output from the non-power battery 12 is supplied to some electrical components of the electric automobile 600 based on the control by the main control unit 300.

The accelerator device 604 includes an accelerator pedal 604a included in the electric automobile 600 and an accelerator detection unit 604b that detects an operation amount (depression amount) of the accelerator pedal 604a. When the accelerator pedal 604a is operated by the driver, the accelerator detector 604b detects the operation amount of the accelerator pedal 604a based on a state where the driver is not operated. The detected operation amount of the accelerator pedal 604a is given to the main controller 300.

The brake device 605 includes a brake pedal 605a included in the electric automobile 600 and a brake detection unit 605b that detects an operation amount (depression amount) of the brake pedal 605a by the driver. When the brake pedal 605a is operated by the driver, the operation amount is detected by the brake detection unit 605b. The detected operation amount of the brake pedal 605a is given to the main control unit 300.

Rotational speed sensor 606 detects the rotational speed of motor 602. The detected rotation speed is given to the main control unit 300.

As described above, the main control unit 300 includes the charge amount of each battery cell 10, the value of the current flowing through the plurality of battery cells 10, the operation amount of the accelerator pedal 604a, the operation amount of the brake pedal 605a, and the rotation of the motor 602. Speed is given. The main control unit 300 performs charge / discharge control of the

battery modules

100M and 100 and power conversion control of the power conversion unit 601 based on these pieces of information.

For example, when the electric vehicle 600 is started and accelerated based on the accelerator operation, the power of the

battery modules

100M and 100 is supplied from the battery system 500 to the power conversion unit 601.

Further, the main control unit 300 calculates a rotational force (command torque) to be transmitted to the drive wheels 603 based on the given operation amount of the accelerator pedal 604a, and outputs a control signal based on the command torque to the power conversion unit 601. To give.

The power conversion unit 601 that has received the control signal converts the power supplied from the battery system 500 into power (drive power) necessary for driving the drive wheels 603. As a result, the driving power converted by the power converter 601 is supplied to the motor 602, and the rotational force of the motor 602 based on the driving power is transmitted to the driving wheels 603.

On the other hand, when the electric automobile 600 is decelerated based on the brake operation, the motor 602 functions as a power generator. In this case, the power conversion unit 601 converts the regenerative power generated by the motor 602 into power suitable for charging the

battery modules

100M and 100, and provides the power to the

battery modules

100M and 100. Thereby, the

battery modules

100M and 100 are charged.

(2) Effects in the Electric Vehicle As described above, since the electric vehicle 600 according to the present embodiment is provided with the battery system 500 according to the first or second embodiment, the wiring work of the electric vehicle 600 is performed. And the wiring structure is simplified.

(3) Configuration and Operation of Other Mobile Body The battery system 500 may be mounted on another mobile body such as a ship, an aircraft, an elevator, or a walking robot.

A ship equipped with the battery system 500 includes, for example, a hull instead of the vehicle body 610 in FIG. 20, a screw instead of the driving wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake device 605. Instead, a deceleration input unit is provided. The driver operates the acceleration input unit instead of the accelerator device 604 when accelerating the hull, and operates the deceleration input unit instead of the brake device 605 when decelerating the hull. In this case, the hull corresponds to the moving main body, the motor corresponds to the power source, and the screw corresponds to the drive unit. The ship does not have to include a deceleration input unit. In this case, when the driver operates the acceleration input unit to stop the acceleration of the hull, the hull is decelerated due to the resistance of water. In such a configuration, the motor receives electric power from the battery system 500 and converts the electric power into power, and the hull moves by rotating the screw with the converted power.

An aircraft equipped with the battery system 500 includes, for example, a fuselage instead of the vehicle body 610 in FIG. 20, a propeller instead of the driving wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake device 605. Instead, a deceleration input unit is provided. Ships and aircraft do not have to include a deceleration input unit. In this case, when the driver operates the acceleration input unit to stop acceleration, the airframe is decelerated due to water resistance or air resistance.

An elevator equipped with the battery system 500 includes, for example, a saddle instead of the vehicle body 610 in FIG. 20, a lifting rope attached to the saddle instead of the driving wheel 603, and an acceleration input unit instead of the accelerator device 604. And a deceleration input unit instead of the brake device 605.

A walking robot equipped with the battery system 500 includes, for example, a torso instead of the vehicle body 610 in FIG. 20, a foot instead of the drive wheel 603, an acceleration input unit instead of the accelerator device 604, and a brake device 605. A deceleration input unit is provided instead of.

In these moving bodies, the motor corresponds to the power source, the hull, the fuselage, the anchor and the fuselage correspond to the main body, and the screw, the propeller, the lifting rope and the foot correspond to the drive unit. The power source receives electric power from the battery system 500 and converts the electric power into motive power, and the drive unit moves the moving main body portion with the motive power converted by the motive power source.

(4) Effects in other moving bodies Since the battery system 500 according to the first or second embodiment is used in such various moving bodies, the wiring work of the moving body and the wiring structure are simplified. Is done.

(5) Modified Example of Moving Body In the electric vehicle 600 of FIG. 20 or another moving body, each battery system 500 may have the same function as the battery ECU 101 instead of the battery ECU 101 provided in each battery system 500. Good.

[4] Fourth Embodiment A power supply device according to a fourth embodiment will be described. The power supply device according to the present embodiment includes battery system 500 according to the first or second embodiment.

(1) Configuration and Operation FIG. 21 is a block diagram illustrating a configuration of a power supply device including the battery system 500. As illustrated in FIG. 21, the power supply device 700 includes a power storage device 710 and a power conversion device 720. The power storage device 710 includes a battery system group 711 and a system controller 712 as a system control unit. The battery system group 711 includes the battery system 500 according to the first or second embodiment. Between the plurality of battery systems 500, the plurality of battery cells 10 may be connected to each other in parallel, or may be connected to each other in series.

The system controller 712 is an example of a system control unit, and includes, for example, a CPU and a memory, or a microcomputer. The system controller 712 is connected to the battery ECU 101 (see FIG. 1) of each battery system 500. The battery ECU 101 of each battery system 500 calculates the charge amount of each battery cell 10 based on the terminal voltage of each battery cell 10 (see FIG. 1), and gives the calculated charge amount to the system controller 712. The system controller 712 controls the power conversion device 720 based on the charge amount of each battery cell 10 given from each battery ECU 101, thereby controlling the discharge or charging of the plurality of battery cells 10 included in each battery system 500. I do.

The power converter 720 includes a DC / DC (DC / DC) converter 721 and a DC / AC (DC / AC) inverter 722. The DC / DC converter 721 has input /

output terminals

721a and 721b, and the DC / AC inverter 722 has input /

output terminals

722a and 722b. The input / output terminal 721 a of the DC / DC converter 721 is connected to the battery system group 711 of the power storage device 710. The input / output terminal 721b of the DC / DC converter 721 and the input / output terminal 722a of the DC / AC inverter 722 are connected to each other and to the power output unit PU1. The input / output terminal 722b of the DC / AC inverter 722 is connected to the power output unit PU2 and to another power system. The power output units PU1, PU2 include, for example, outlets. For example, various loads are connected to the power output units PU1 and PU2. Other power systems include, for example, commercial power sources or solar cells. This is an external example in which power output units PU1, PU2 and another power system are connected to a power supply device.

The DC / DC converter 721 and the DC / AC inverter 722 are controlled by the system controller 712, whereby the plurality of battery cells 10 included in the battery system group 711 are discharged and charged.

When the battery system group 711 is discharged, power supplied from the battery system group 711 is DC / DC (direct current / direct current) converted by the DC / DC converter 721, and further DC / AC (direct current / alternating current) conversion is performed by the DC / AC inverter 722. Is done.

The power DC / DC converted by the DC / DC converter 721 is supplied to the power output unit PU1. The power DC / AC converted by the DC / AC inverter 722 is supplied to the power output unit PU2. DC power is output to the outside from the power output unit PU1, and AC power is output to the outside from the power output unit PU2. The electric power converted into alternating current by the DC / AC inverter 722 may be supplied to another electric power system.

The system controller 712 performs the following control as an example of control related to the discharge of the plurality of battery cells 10 included in each battery system 500. When the battery system group 711 is discharged, the system controller 712 determines whether to stop discharging based on the charge amount of each battery cell 10 given from each battery ECU 101 (see FIG. 1), and based on the determination result. The power converter 720 is controlled. Specifically, when the charge amount of any one of the plurality of battery cells 10 (see FIG. 1) included in the battery system group 711 becomes smaller than a predetermined threshold, the system controller 712 The DC / DC converter 721 and the DC / AC inverter 722 are controlled so that the discharge is stopped or the discharge current (or discharge power) is limited. Thereby, overdischarge of each battery cell 10 is prevented.

On the other hand, when the battery system group 711 is charged, AC power supplied from another power system is AC / DC (AC / DC) converted by the DC / AC inverter 722, and further DC / DC (DC) is converted by the DC / DC converter 721. / DC) converted. When power is supplied from the DC / DC converter 721 to the battery system group 711, the plurality of battery cells 10 (see FIG. 1) included in the battery system group 711 are charged.

The system controller 712 performs the following control as an example of control related to charging of the plurality of battery cells 10 included in each battery system 500. When charging the battery system group 711, the system controller 712 determines whether or not to stop charging based on the charge amount of each battery cell 10 given from each battery ECU 101 (see FIG. 1), and based on the determination result. The power converter 720 is controlled. Specifically, when the charge amount of any one of the plurality of battery cells 10 included in the battery system group 711 exceeds a predetermined threshold value, the system controller 712 stops charging. Or the DC / DC converter 721 and the DC / AC inverter 722 are controlled such that the charging current (or charging power) is limited. Thereby, overcharge of each battery cell 10 is prevented.

(2) Effect As described above, since the power supply device 700 according to the present embodiment is provided with the battery system 500 according to the first or second embodiment, the wiring work of the power supply device 700 and the wiring structure are performed. Is simplified.

(3) Modified Example of Power Supply Device In the power supply device 700 of FIG. 21, the system controller 712 may have the same function as the battery ECU 101 instead of providing the battery ECU 101 in each battery system 500.

As long as power can be supplied between the power supply apparatus 700 and the outside, the power conversion apparatus 720 may include only one of the DC / DC converter 721 and the DC / AC inverter 722. Further, the power conversion device 720 may not be provided as long as power can be supplied between the power supply device 700 and the outside.

21 includes a plurality of battery systems 500, but is not limited thereto, and only one battery system 500 may be provided.

[5] Other Embodiments (1) In the above embodiment, among the plurality of

battery modules

100M, 100 connected in series, the battery module 100M is arranged on the highest potential side, but the present invention is not limited to this. The battery module 100M may be disposed on the lowest potential side. In this case, the second circuit 24 of the battery module 100 arranged on the highest potential side and the battery ECU 101 are connected by a communication cable.

(2) In the above embodiment, the battery module 100M and the battery ECU 101 are connected so that the termination resistor RT is located at the end of the bus 103, but is not limited thereto. When the signal reflection at the end of the bus 103 is small, the battery module 100M and the battery ECU 101 do not have to be connected so that the termination resistor RT is located at the end of the bus 103.

(3) In the above embodiment, the battery module 100M has the shunt resistor RS as an element that generates a voltage corresponding to the current flowing through the plurality of battery cells 10, but is not limited thereto. For example, the battery module 100M may include other elements such as a Hall element that generates a voltage corresponding to the current flowing through the plurality of battery cells 10. In this case, the third circuit 80 detects the current flowing through the plurality of battery cells 10 in the form of voltage by detecting the voltage generated in the Hall element.

(4) In the above embodiment, the battery system 500 includes the battery ECU 101, but is not limited thereto. When the second circuit 24 has the function of the battery ECU 101, the battery system 500 may not have the battery ECU 101.

(5) In the above embodiment, the battery system 500 includes one battery module 100M, but is not limited thereto. When the battery system 500 does not include the battery ECU 101, the battery system 500 may include two battery modules 100M. In this case, the two battery modules 100M are connected so that the termination resistor RT is located at the end of the bus 103. In addition, when the battery system 500 includes two battery modules 100M, one battery module 100M may include the shunt resistor RS, the third circuit 80, and the insulating element 27.

(6) In the above embodiment, the voltage / current bus bar 40y having substantially the same shape as the bus bar 40 is used as the shunt resistor RS, but the present invention is not limited to this. Another resistive element may be used as the shunt resistor RS.

(7) In the above embodiment, the voltage / current bus bar 40y is connected to the battery cell 10 arranged at the end of the battery module 100M, but the present invention is not limited to this. The voltage / current bus bar 40y may be connected in place of one of the plurality of bus bars 40 connecting the plus electrode 10a and the minus electrode 10b of two adjacent battery cells 10.

(8) In the above embodiment, the ground pattern GND1L and the ground pattern GND3 are separately formed on the main circuit board 21, but the present invention is not limited to this. Since the potentials of the ground pattern GND1L and the ground pattern GND3 are equal, the ground pattern GND1L and the ground pattern GND3 may be integrally formed.

(9) In the above embodiment, the ground pattern GND1H and the ground pattern GND3 are separately formed on the main circuit board 21, but the present invention is not limited to this. For example, when the voltage / current bus bar 40y is used as the bus bar 40 that connects the plus electrode 10a of the ninth battery cell 10 and the minus electrode 10b of the tenth battery cell 10, the potentials of the ground pattern GND1H and the ground pattern GND3 are equal. Become. In this case, the ground pattern GND1H and the ground pattern GND3 may be integrally formed.

(10) First Modification of Battery Module The

main circuit boards

21 and 21b of the battery module 100M may be attached to the upper surface of the battery block 10BB of the battery module 100M without being attached to the end face frame 92. Similarly, the

sub circuit boards

21a and 21c of the battery module 100 may be attached to the upper surface of the battery block 10BB of the battery module 100 without being attached to the end face frame 92.

FIG. 22 is an exploded perspective view showing the configuration of the battery module 100M according to the first modification. As shown in FIG. 22, the battery module 100M according to the first modification is disposed in a casing (housing) CA having an open top. The battery module 100M further includes a gas duct 111 and a lid member 70. The lid member 70 is made of an insulating material such as resin and has a rectangular plate shape. The gas duct 111, the wiring member 110, the lid member 70, and the main circuit board 21 are sequentially arranged on the upper surface of the battery block 10BB. The wiring member 110 and the gas duct 111 are attached to the lower surface of the lid member 70, and the main circuit board 21 is attached to the upper surface of the lid member 70. Battery block 10BB is accommodated in casing CA, and lid member 70 is fitted in casing CA so as to close the opening of casing CA. Thereby, the battery box BB that houses the battery module 100M is formed. Here, the lid member 70 may be attached to the casing CA by screwing or an adhesive. Thereby, the lid member 70 can be reliably fixed to the casing CA. Further, the lid member 70 may not be fitted into the casing CA.

FIG. 23 is a perspective view of the lid member 70 of FIG. 22 as viewed obliquely from below. 24 is a perspective view of the lid member 70 of FIG. 22 as viewed obliquely from above. Hereinafter, one side and the other side of the lid member 70 along the X direction are referred to as a side side 70a and a side side 70b, respectively. The side 70a of the lid member 70 is along a side E1 (see FIG. 22) in one direction of the battery block 10BB (see FIG. 22). See). Further, the surface of the lid member 70 facing the battery block 10BB is called a back surface, and the surface of the lid member 70 on the opposite side is called a front surface. In this example, the surface of the lid member 70 is directed upward.

23, FPC fitting portions 74 are formed on the back surface of the lid member 70 so as to extend along the side side 70a and the side side 70b of the lid member 70, respectively. The FPC board 50 of the wiring member 110 is fitted into the FPC fitting portion 74. Hereinafter, the FPC fitting portions 74 provided along the side 70a and the side 70b of the lid member 70 are referred to as the FPC fitting 74 74 on the side 70a side and the side 70b side, respectively.

A plurality of

concave portions

71 and 72 are provided along the FPC fitting portions 74 on the side side 70a side and the side side 70b side. In this example, nine concave portions 71 are provided along the FPC fitting portion 74 on the side 70a side. One recess 72, eight recesses 71, and another one recess 72 are provided along the side edge 70 b of the lid member 70.

The

recesses

71 and 72 have a substantially rectangular shape, and the length of the recess 71 in the X direction is larger than the length of the recess 72 in the X direction. The shape and length of the recess 71 are approximately equal to the shape and length of the bus bar 40, and the shape and length of the recess 72 are approximately equal to the shape and length of the bus bar 40a. A plurality of openings 73 are formed so as to penetrate from the bottom surfaces of the plurality of

recesses

71 and 72 to the surface of the lid member 70 (see FIG. 24). Two openings 73 (see FIG. 24) are formed in each recess 71, and one opening 73 (see FIG. 24) is formed in each recess 72. Hereinafter, the recess 71 and the opening 73 provided along the side 70a of the lid member 70 are referred to as the recess 71 on the side 70a and the opening 73 on the side 70a, respectively, and are along the side 70b of the lid 70. The

recesses

71 and 72 and the opening 73 thus provided are referred to as the

recesses

71 and 72 on the side 70b side and the opening 73 on the side 70b side, respectively.

The bus bar 40 of the wiring member 110 is fitted into the recess 71 of the lid member 70, and the bus bar 40 a of the wiring member 110 is fitted into the recess 72. In a state where the bus bar 40 is fitted in the recess 71, the electrode connection hole 43 of the bus bar 40 is exposed to the surface side of the lid member 70 in the opening 73. Similarly, the electrode connection hole 47 of the bus bar 40 a is exposed to the surface side of the lid member 70 in the opening 73 in a state where the bus bar 40 a is fitted in the recess 72.

The duct fitting portion 77 is formed so as to extend in the X direction between the plurality of recesses 71 on the side 70a side and the plurality of

recesses

71 and 72 on the side 70b side. The gas duct 111 is fitted in the duct fitting portion 77.

A plurality of pairs of connection grooves 75 are formed so as to extend from the plurality of recesses 71 on the side 70a side to the FPC fitting portion 74 on the side 70a side. A plurality of pairs of connection grooves 75 are formed so as to extend from the plurality of recesses 71 on the side 70b side to the FPC fitting portion 74 on the side 70b side. A plurality of connection grooves 76 are formed to extend from the plurality of recesses 72 on the side 70b side to the FPC fitting portion 74 on the side 70b side. A pair of attachment pieces 42 of the plurality of bus bars 40 are respectively disposed in the plurality of pairs of connection grooves 75. In the plurality of connection grooves 76, the attachment pieces 46 of the plurality of bus bars 40a are respectively arranged.

Next, the connection between the FPC board 50 and the main circuit board 21 will be described. FIG. 25 is a view of the plurality of bus bars 40, 40a and the two FPC boards 50 in the first modification as viewed from above. The FPC board 50 of FIG. 25 has the same configuration as the FPC board 50 of FIG. 12 except for the following points.

As shown in FIG. 25, each FPC board 50 further includes a plurality of connection terminals 22a corresponding to a plurality of conductor lines 52. The plurality of connection terminals 22a are arranged so as to be aligned in the X direction along one side of each FPC board 50. Each conductor line 52 is provided to extend parallel to the Y direction between the corresponding PTC element 60 and the connection terminal 22a. The connection terminals 22a and the bus bars 40, 40a are electrically connected by the

conductor wires

51, 52 and the PTC element 60.

FIG. 26 is a view of the main circuit board 21 in the first modification as viewed from above. The main circuit board 21 of FIG. 26 has the same configuration as the main circuit board 21 of FIG. 12 except for the following points.

As shown in FIG. 26, the main circuit board 21 has a rectangular plate shape. The plurality of connection terminals 22 of the main circuit board 21 are arranged along the one side and the other side of the main circuit board 21 in the X direction. The plurality of connection terminals 22 correspond to the plurality of connection terminals 22a (see FIG. 25) of the FPC board 50.

FIG. 27 is a schematic cross-sectional view showing a connection structure between the FPC board 50 and the main circuit board 21 in the first modification. FIG. 27 shows a connection structure between one connection terminal 22 a of the FPC board 50 and one connection terminal 22 of the main circuit board 21.

27, a hole 53 is formed in each connection terminal 22a of the FPC board 50, and a hole 23 is formed in each connection terminal 22 of the main circuit board 21. Further, a hole 78 is formed in the portion of the lid member 70 between each connection terminal 22a and each connection terminal 22. A connection member PH is attached between each connection terminal 22 a and each connection terminal 22. In the first modification, a pin header is used as the connection member PH.

The connection member PH has a pin PN1 protruding downward and a pin PN2 protruding upward. The pins PN1 and PN2 are formed of one pin integrally with each other. Note that the pins PN1 and PN2 may be separate if the pins PN1 and PN2 are electrically connected. The pin PN1 of the connecting member PH is inserted into the hole 53 of the FPC board 50 from above the FPC board 50, and the pin PN2 of the connecting member PH is inserted into the hole 78 of the lid member 70 and the main circuit board 21 from below the lid member 70. It is inserted into the hole 23.

In this state, the pin PN1 of the connection member PH is connected to the connection terminal 22a of the FPC board 50 by the solder SO, and the pin PN2 is connected to the connection terminal 22 of the main circuit board 21. Thereby, each connection terminal 22 a of the FPC board 50 is electrically connected to the corresponding connection terminal 22 of the main circuit board 21.

In the battery module 100M according to the second modification, the shunt resistor RS is provided on one FPC board 50 as in the battery module 100M of FIG. 7, but the present invention is not limited to this. The shunt resistor RS may be provided on the main circuit board 21 so as to be connected in series with the plurality of battery cells 10 of the battery module 100M. In this case, as the shunt resistor RS, another resistance element different from the voltage / current bus bar 40y may be provided.

In this way, the gas duct 111, the wiring member 110, and the main circuit board 21 are attached to the lid member 70. In this state, the lid member 70 is attached to the upper surface of the battery block 10BB. The plus electrodes 10a (see FIG. 22) and the minus electrodes 10b (see FIG. 22) of the plurality of battery cells 10 are fitted into the electrode connection holes 43 of the plurality of bus bars 40. The positive electrodes 10a or the negative electrodes 10b of the plurality of battery cells 10 are inserted into the electrode connection holes 47 of the plurality of bus bars 40a. The gas duct 111 is disposed on the upper surface of the battery block 10BB so as to cover the gas vent valves 10v of the plurality of battery cells 10.

In each opening 73 (see FIG. 24) of the lid member 70, a nut (not shown) is screwed into the male threads of the plus electrode 10a and the minus electrode 10b. Thereby, adjacent battery cells 10 are electrically connected via the bus bar 40. As a result, the plurality of battery cells 10 are connected in series. A plurality of bus bars 40, 40a are connected to the low potential abnormality detection unit 30L and the high potential abnormality detection unit 30H (see FIG. 26) on the main circuit board 21 through the FPC board 50.

Thus, in the battery module 100M, the gas duct 111, the wiring member 110, and the main circuit board 21 are integrally provided on the lid member 70. Therefore, battery module 100M can be easily assembled by attaching lid member 70 to battery block 10BB. Further, the gas discharged from the gas vent valve 10v of the battery cell 10 can be efficiently discharged to the outside through the gas duct 111.

Further, when the number of battery cells 10 included in the battery block 10BB is large, the area of the upper surface of the battery block 10BB is larger than the area of the end face frame 92 (see FIG. 22). Therefore, the main circuit board 21 larger than the main circuit board 21 of FIG. 7 can be disposed on the upper surface of the battery block 10BB of FIG. Therefore, a larger number of circuits can be mounted on the main circuit board 21.

In this example, the strength of the battery module 100M is improved by forming the battery box BB that houses the battery module 100M. Further, since the battery block 10BB of the battery module 100M is fixed to the casing CA of the battery box BB and the lid member 70 is fitted to the casing CA, the battery block 10BB and the lid member 70 can be reliably fixed. .

In this example, the opening of the casing CA is closed by the lid member 70. Therefore, the inside of the battery box BB may be molded with resin. In this case, condensation of the battery cell 10 can be prevented. Further, the resin molded in the battery box BB can affect the heat conduction characteristics of the battery module 100M. For example, by molding the inside of the battery box BB with a resin having a higher thermal conductivity than air, the heat in the battery box BB can be released to the outside. On the other hand, by molding the inside of the battery box BB with a resin having a thermal conductivity lower than that of air, the inflow of heat from the outside into the battery box BB can be blocked.

Further, since the inside of the battery box BB is closed, the inside of the battery box BB can be exhausted by providing a hole in at least one of the casing CA and the lid member 70. In this case, the gas duct 111 may not be provided in the battery module 100M.

(11) Second Modification of Battery Module FIG. 28 is an exploded perspective view showing a configuration of a battery module 100M according to the second modification. Differences of the battery module 100M according to the second modification from the battery module 100M according to the first modification will be described.

As shown in FIG. 28, the gas duct 111, the lid member 70, the wiring member 110, and the main circuit board 21 are sequentially arranged on the upper surface of the battery block 10BB. The battery module 100M according to the second modification and the battery module 100M according to the first modification have different positional relationships between the lid member 70 and the FPC board 50. The gas duct 111 is attached to the lower surface of the lid member 70, and the wiring member 110 and the main circuit board 21 are attached to the upper surface of the lid member 70.

FIG. 29 is a perspective view of the lid member 70 of FIG. 28 as viewed obliquely from below. FIG. 30 is a perspective view of the lid member 70 of FIG. 28 as viewed obliquely from above. As shown in FIG. 29, the back surface of the lid member 70 has the same configuration as the surface of the lid member 70 in FIG. 29 except that a duct fitting portion 77 is formed. As shown in FIG. 30, the surface of the lid member 70 has the same configuration as the back surface of the lid member 70 of FIG. 28 except that the duct fitting portion 77 is not formed.

The connection between the FPC board 50 and the main circuit board 21 is the same as the connection between the FPC board 50 and the main circuit board 21 in the first modification. In the second modification, the lid member 70 is not disposed between the FPC board 50 and the main circuit board 21, and thus the hole 78 of FIG. 27 is not provided in the lid member 70.

The gas duct 111, the wiring member 110, and the main circuit board 21 are attached to the lid member 70. In this case, the bus bars 40, 40 a of the wiring member 110 are attached to the surface of the lid member 70. The plurality of bus bars 40, 40a are connected to the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10 in the same manner as the battery module 100M according to the first modification.

Thus, also in this battery module 100M, the gas duct 111, the wiring member 110, and the main circuit board 21 are integrally provided on the lid member 70. Therefore, battery module 100M can be easily assembled by attaching lid member 70 to battery block 10BB. Further, the gas discharged from the gas vent valve 10v of the battery cell 10 can be efficiently discharged to the outside through the gas duct 111.

When the number of battery cells 10 included in the battery block 10BB is large, the area of the upper surface of the battery block 10BB is larger than the area of the end face frame 92 (see FIG. 28). Therefore, the main circuit board 21 larger than the main circuit board 21 of FIG. 7 can be disposed on the upper surface of the battery block 10BB of FIG. Therefore, a larger number of circuits can be mounted on the main circuit board 21.

(12) In the first modification and the second modification of the

battery modules

100M and 100 described above, the lid member 70 is attached to the casing CA, but is not limited thereto. For example, when the

battery modules

100M and 100 are not accommodated in the casing CA, or when a plurality of battery modules 100 are accommodated in one casing, the lid member 70 may be attached to the battery block 10BB for each of the

battery modules

100M and 100. Good. In particular, when the gas duct 111 and the wiring member 110 are provided integrally with the lid member 70, nuts (not shown) are connected to the plus electrodes 10 a and the minus electrodes of the plurality of battery cells 10 in the openings 73 of FIGS. 23 and 28. By screwing into the male screw 10b, electrical connection between the bus bars 40, 40a and these

electrodes

10a, 10b can be made and the lid member 70 can be easily attached to the battery block 10BB. As described above, by integrally handling the wiring member 110, the gas duct 111, and the lid member 70, the

battery modules

100M and 100 can be easily assembled.

(13) In the battery system 500 according to the above embodiment, as shown in FIG. 1, the battery ECU 101 is connected to one end of the bus 103, but is not limited thereto. The battery ECU 101 in FIG. 1 may not be connected to one end of the bus 103. FIG. 31 is a block diagram showing a configuration of a battery system 500 according to another embodiment. As shown in FIG. 31, in the battery system 500 according to the present embodiment, the battery ECU 101 is connected to a bus 103 between the

battery modules

100M and 100c. In this case, a termination resistor RT as a second termination resistor is provided in the battery module 100b as a communication device connected to one end of the bus 103.

Therefore, the termination resistance RT of the

main circuit boards

21 and 21b of the battery module 100M is connected to one end of the bus 103, and the termination resistance RT of the

sub circuit boards

21a and 21c of the battery module 100b is connected to the other end of the bus 103. Thereby, impedance matching of the bus 103 is performed. As a result, good communication can be performed between the battery modules 100M, 100a to 100c and the battery ECU 101 without requiring complicated wiring work and without complicating the wiring structure.

Thus, the communication device is a second battery module that includes a plurality of second battery cells and a second circuit board, and the second circuit board detects the voltage of each second battery cell. And a second communication unit connected to the communication bus and connected to the second voltage detection unit.

In this case, the voltage of each second battery cell of the second battery module is detected by the second voltage detection unit of the second circuit board. The detected voltage of each second battery cell can be transmitted to the first communication unit of the first battery module or the external device via the communication bus by the second communication unit of the second circuit board.

The second termination resistor of the second circuit board is connected to the communication bus. Thereby, impedance matching of the communication bus is performed. As a result, good communication can be performed between the first and second battery modules without requiring complicated wiring work and without complicating the wiring structure.

(14) The mobile body such as the electric automobile 600 or the ship according to the above embodiment is an electric device including the battery system 500 and the motor 602 as a load. The electric device according to the present invention is not limited to a moving body such as the electric automobile 600 and a ship, and may be a washing machine, a refrigerator, an air conditioner, or the like. For example, a washing machine is an electric device including a motor as a load, and a refrigerator or an air conditioner is an electric device including a compressor as a load.

As described above, the electrical apparatus according to the present embodiment includes the battery system and a load driven by electric power from the battery system.

In this electrical device, the load is driven by power from the battery system.

Since the battery system is used for this electrical device, the wiring work and wiring structure of the electrical device are simplified.

[6] Correspondence relationship between each constituent element of claim and each part of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each part of the embodiment will be described. It is not limited.

In the above embodiment, the battery cell 10 of the battery module 100M is an example of the first battery cell, the

main circuit boards

21 and 21b are examples of the first circuit board, and the battery module 100M is the first battery. It is an example of a module. The battery cell 10 of the battery module b is an example of the second battery cell, the

sub circuit boards

21a and 21c are examples of the second circuit board, and the battery module 100b is an example of the second battery module. The bus 103 is an example of a communication bus, the first circuit 30 of the

main circuit boards

21 and 21b is an example of a first voltage detection unit, and the second circuit 24 of the

main circuit boards

21 and 21b is a first communication unit. The first circuit 30 of the

sub circuit boards

21a and 21c is an example of the second voltage detection unit, and the second circuit 24 of the

sub circuit boards

21a and 21c is an example of the second communication unit.

The battery module 100b or the battery ECU 101 is an example of a communication device, the termination resistance RT of the

main circuit boards

21 and 21b is an example of a first termination resistance, and the termination resistance RT of the battery module 100b or the battery ECU 101 is a second termination resistance. It is an example of resistance, and battery ECU101 is an example of a control part. The third circuit 80 or the power supply circuit 243 is an example of a circuit unit, the third circuit 80 is an example of a current detection unit, and the shunt resistor RS or the Hall element is an example of an element. The communication cable P1 is an example of a communication cable, the

connectors

23a and 23b of the

main circuit boards

21 and 21b are examples of connectors, the battery system 500 is an example of a battery system, the motor 602 is an example of a motor, and driving The wheel 603 is an example of a drive wheel, and the electric automobile 600 is an example of an electric vehicle.

A body 610, a ship hull, an aircraft fuselage, an elevator cage, or a torso of a walking robot are examples of the moving main body. Motors 602, drive wheels 603, screws, propellers, hoisting motors for elevating ropes, or walking robot legs are examples of power sources. An electric vehicle 600, a ship, an aircraft, an elevator, or a walking robot are examples of moving objects. The system controller 712 is an example of a system control unit, the power storage device 710 is an example of a power storage device, the power conversion device 720 is an example of a power conversion device, and the power supply device 700 is an example of a power supply device. The motor 602 or the compressor is an example of a load, and the electric automobile 600, a ship, an aircraft, an elevator, a walking robot, a washing machine, a refrigerator, or an air conditioner is an example of an electric device.

As the constituent elements of the claims, various other elements having configurations or functions described in the claims can be used.

The present invention can be effectively used for various mobile objects using electric power as a drive source, power storage devices, mobile devices, and the like.

Claims

A first battery module including a plurality of first battery cells and a first circuit board;
A communication bus,
The first circuit board is:
A first voltage detector for detecting the voltage of each first battery cell;
A first communication unit connected to the first voltage detection unit and connectable to the communication bus;
A battery system comprising: a first termination resistor connectable to the communication bus.
A battery system further comprising a communication device connectable to the communication bus.
The communication device is a second battery module including a plurality of second battery cells and a second circuit board,
The second circuit board is:
A second voltage detector for detecting the voltage of each second battery cell;
The battery system according to claim 2, further comprising a second communication unit connected to the second voltage detection unit and connectable to the communication bus.
A second battery module including a plurality of second battery cells and a second circuit board;
The second circuit board is:
A second voltage detector for detecting the voltage of each second battery cell;
A second communication unit connected to the second voltage detection unit and connectable to the communication bus,
The battery system according to claim 2, wherein the communication device is a control unit that includes a second terminal resistor connectable to the communication bus and performs an operation related to control of the first and second battery modules.
The battery system according to any one of claims 1 to 4, wherein the first circuit board further includes a circuit unit that performs an operation different from that of the first voltage detection unit.
6. The circuit unit according to claim 5, wherein the circuit unit includes a current detection unit configured to detect information related to a current flowing through the plurality of first battery cells and to transmit the detected information through the communication bus. Battery system.
The first battery module further includes an element that generates a voltage corresponding to a current flowing through the plurality of first battery cells,
The current detection unit of the first circuit board detects a current flowing in the plurality of first battery cells in the form of a voltage as the information by detecting a voltage generated in the element. The described battery system.
The communication bus includes a communication cable;
The first circuit board further includes a connector electrically connected to the first communication unit and connectable to the communication cable,
The battery system according to any one of claims 1 to 7, wherein the first termination resistor is electrically connected to the connector.
The battery system according to any one of claims 1 to 8,
A motor driven by power from the battery system;
An electric vehicle comprising drive wheels that are rotated by the rotational force of the motor.
The battery system according to any one of claims 1 to 8,
A moving body,
A moving body comprising: a power source that converts electric power from the battery system into power for moving the moving main body.
The battery system according to any one of claims 1 to 8,
A power storage device comprising: a system control unit that performs control related to discharging or charging of the battery system.
Can be connected to the outside,
A power storage device according to claim 11;
A power conversion device that performs power conversion between the battery system of the power storage device and the outside;
The said system control part is a power supply device which controls the said power converter device.
The battery system according to any one of claims 1 to 8,
An electric device comprising a load driven by electric power from the battery system.