WO2012042912A1 - Battery system, electric vehicle provided therewith, mobile body, electric-power storage apparatus, power-supply apparatus, and electrical device - Google Patents

Abstract

A battery system provided with a plurality of battery modules, each of which contains a plurality of battery cells. Electrode terminals for a plurality of battery cells are lined up on the top surface of a battery block of one battery module, and a first circuit for detecting the states of said plurality of battery cells is provided on an end surface of said battery block. A plurality of conductive wires electrically connecting the plurality of battery-cell electrode terminals to the first circuit on the one battery module are provided along the top surface of that battery block. A first circuit for detecting the states of a plurality of battery cells is provided on another battery module. The plurality of battery modules are arranged such that the battery block of the one battery module is located between the first circuit on the one battery module and the first circuit on the other battery module. In this state, a harness is connected between the first circuits on the plurality of battery modules.

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.

In a battery system used as a driving source for a moving body such as an electric automobile, a plurality of battery modules that can be charged and discharged are provided in order to obtain a predetermined driving force. Each battery module has a configuration in which a plurality of batteries (battery cells) are connected in series, for example.

Patent Document 1 describes a power supply device for automobiles. The power supply device includes an assembled battery including a plurality of divided units connected in series, a plurality of battery state detection circuits connected to the plurality of divided units, and a plurality of battery state detection circuits via an external communication bus. And a connected battery ECU (Electronic Control Unit). Each battery state detection circuit includes a voltage detector, an A / D (analog / digital) converter, a unit arithmetic circuit, and a communication circuit. Each battery state detection circuit detects the state of each divided unit by the unit arithmetic circuit, and transmits the detected state of the divided unit to the battery ECU via the external communication bus.
JP 2003-47111 A

However, in the automobile power supply device described in Patent Document 1, wiring such as a lead wire for detecting a voltage and a communication wire constituting an external communication bus becomes complicated, and wiring work becomes complicated.

An object of the present invention is to provide a battery system capable of reducing the complexity of wiring work, an electric vehicle equipped with the battery system, a moving body, a power storage device, a power supply device, and an electric device.

A battery system according to the present invention includes a first battery module, a second battery module, and a wiring, and the first battery module includes a plurality of battery blocks including a plurality of first battery cells, and a plurality of battery blocks. A first state detection circuit for detecting the state of the first battery cell, and a plurality of state detection lines electrically connecting the electrode terminals of the plurality of first battery cells and the first state detection circuit The battery block has a first surface on which the electrode terminals of the plurality of first battery cells are arranged, and a second surface on which the first state detection circuit is provided, and the second battery module is A plurality of second battery cells and a second state detection circuit for detecting a state of the plurality of second battery cells, and between the first state detection circuit and the second state detection circuit At least The first and second battery modules are arranged so that the battery block is arranged, and the wiring is extended along a plane different from the first and second faces of the battery block. It is electrically connected to the second state detection circuit.

According to the present invention, the complexity of wiring work can be reduced.

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 configurations of the filter circuit, 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 an external perspective view of the battery module in a state where a harness is connected to the connector of the sub circuit board. FIG. 17 is an external perspective view of the battery module according to the second embodiment. FIG. 18 is a perspective view of the separator. FIG. 19 is a perspective view of the separator. FIG. 20 is an external perspective view of the battery module in the battery system according to the second embodiment. FIG. 21 is an external perspective view of the battery module in the battery system according to the third embodiment. FIG. 22 is a block diagram illustrating a configuration of an electric vehicle including a battery system. FIG. 23 is a block diagram illustrating a configuration of a power supply device including a battery system. FIG. 24 is an exploded perspective view showing a configuration of a battery module according to a modification of the first 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, battery system 500 includes one battery module 100M and three battery modules 100. In the following description, the three battery modules 100 are referred to as battery modules 100a, 100b, and 100c, respectively. The battery modules 100M and 100a are examples of the second battery module, and the battery modules 100b and 100c are examples of the first battery module.

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

In each of the battery modules 100M, 100a to 100c, the plurality of battery cells 10 are integrally disposed so as to be adjacent to each other, and are connected in series by the plurality of bus bars 40. The bus bars 40 of the battery modules 100b and 100c are examples of connection members. 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, 100a to 100c are connected in series.

The battery module 100M has a main circuit board 21 made of a rigid printed circuit board. A plurality of first circuits 30, second circuits 24, and third circuits 80 are mounted on the main circuit board 21. Each of the battery modules 100a to 100c has a sub circuit board 21a made of a rigid printed circuit board. A plurality of first circuits 30 and second circuits 24 are mounted on the sub circuit board 21a, and the third circuit 80 is not mounted. The first circuit 30 of the battery modules 100M and 100a is an example of the second state detection circuit, and the first circuit 30 of the battery modules 100b and 100c is an example of the first state detection circuit. The third circuit 80 of the battery module 100M is another example of the second state detection circuit. The communication circuit 24 of the battery modules 100M and 100a is an example of the second communication circuit, and the communication circuit 24 of the battery modules 100b and 100c is an example of the first communication circuit.

In the main circuit board 21, each first circuit 30 has a function of detecting terminal voltages of the plurality of battery cells 10. The second circuit 24 has a function of performing serial communication with a battery ECU (Electronic Control Unit) 101 or other battery modules 100a to 100c. 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 voltages of the plurality of battery cells 10 of the battery module 100M and the currents 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 terminal voltages of a plurality of battery cells 10. The second circuit 24 has a function of performing serial communication with the battery ECU 101 or other battery modules 100M, 100a to 100c.

The second circuit 24 is connected to the first circuit 30. Thereby, the second circuit 24 acquires terminal voltages of the plurality of battery cells 10 of the battery modules 100a to 100c. The second circuit 24 is electrically connected to each thermistor 11 of the battery modules 100a to 100c. Thereby, the second circuit 24 detects the temperatures of the battery modules 100a to 100c.

The second circuit 24 of each battery module 100M, 100a to 100c and the battery ECU 101 are connected by harnesses P1, P2, P3, and P4. Harnesses P1 and P3 are examples of wiring. As will be described later, a pair of communication lines provided in the harnesses P1 to P4 constitute a bus. For example, 100Ω termination resistors RT are attached to both ends of the bus. One termination resistor RT is mounted on the main circuit board 21 of the battery module 100M. The other termination resistor RT is provided in the battery ECU 101. The temperatures of the battery modules 100M, 100a to 100c, the terminal voltages of the plurality of battery cells 10 and the currents flowing through the plurality of battery cells 10 are referred to as cell information. Each second circuit 24 transmits the cell information to the battery ECU 101 via the bus.

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, 100a to 100c based on the cell information given from each second circuit 24. The abnormality of the battery modules 100M, 100a to 100c is, for example, overdischarge, overcharge, or temperature abnormality of the battery cell 10.

The power supply line 501 connected to the positive electrode having the highest potential of the battery module 100M and the power supply line 501 connected to the negative electrode having the lowest potential of the battery module 100b 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, 100a to 100c, the battery ECU 101 turns off the contactor 102. As a result, since no current flows through the plurality of battery cells 10 in the event of an abnormality, abnormal heat generation of the battery modules 100M, 100a to 100c is prevented.

The battery ECU 101 is connected to the main control unit 300 of the electric vehicle via the bus 104. The battery ECU 101 gives the main control unit 300 the amount of charge of each of the battery modules 100M, 100a to 100c (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. When the charging amount of each battery module 100M, 100 decreases, the main control unit 300 controls a power generator (not shown) connected to the power line 501 to charge each battery module 100M, 100a to 100c.

FIG. 2 is an explanatory diagram showing connections between the main circuit board 21 and the plurality of sub circuit boards 21a in FIG. A plurality of first circuits 30, a common second circuit 24, a third circuit 80, insulating elements 25 and 27, filter circuits 28, and connectors 23a and 23b are mounted on the main circuit board 21 of the battery module 100M. 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, L2 and a pair of connection lines L3, L4. The connector 23b is connected to the second circuit 24 by a pair of connection lines L5 and L6 and a pair of L7 and L8. Connection line L1 and connection line L5 are electrically connected. Connection line L2 and connection line L6 are electrically connected. The connection line L3 and the connection line L7 are electrically connected. Connection line L4 and connection line L8 are electrically connected.

The low potential side first circuit 30L and the high potential side first circuit 30H are connected to the plurality of battery cells 10 (see FIG. 1) of the battery module 100M via the filter circuit 28. 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 any of them. A termination resistor RT is connected between the pair of connection lines L5 and L6 of the main circuit board 21.

The sub-circuit board 21a of each of the battery modules 100a to 100c includes a low potential side first circuit 30L, a high potential side first circuit 30H, a common second circuit 24, an insulating element 25, a filter circuit 28, and connectors 23a and 23b. Implemented. 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, L2 and a pair of connection lines L3, L4. The connector 23b is connected to the second circuit 24 by a pair of connection lines L5 and L6 and a pair of L7 and L8. Connection line L1 and connection line L5 are electrically connected. Connection line L2 and connection line L6 are electrically connected. The connection line L3 and the connection line L7 are electrically connected. Connection line L4 and connection line L8 are electrically connected.

The low potential side first circuit 30L and the high potential side first circuit 30H are connected to the plurality of battery cells 10 (see FIG. 1) of the battery modules 100a to 100c via the filter circuit 28. The plurality of battery cells 10 of the battery modules 100a to 100c are used as power sources 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 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 MPU 106 is communicably connected to the main control unit 300 of the electric vehicle via the bus 104. On the printed circuit board 105, other circuits such as a power supply circuit and a contactor control circuit for turning on and off the contactor 102 of FIG. 1 are mounted. The power supply circuit steps down the voltage of the non-power battery 12. The MPU 106 and the switch circuit 107 operate with electric power output from the power supply circuit.

The connector 108 is connected to the MPU 106 through a pair of connection lines L9 and L10, and is connected to the non-power battery 12 through the switch circuit 107 through a pair of connection lines L11 and L12. A termination resistor RT is connected between the pair of connection lines L9 and L10. On / off of the switch circuit 107 is controlled by the MPU 106. When the switch circuit 107 is on, power from the non-power battery 12 is output from the connector 108 via the switch circuit 107 and the connection lines L11 and L12.

A plurality of harnesses P1 to P4 are used to connect the battery modules 100M, 100a to 100c and the battery ECU 101. Each harness P1 to P4 includes a pair of communication lines 56, 57 and a pair of power supply lines 58, 59. The communication lines 56 and 57 of the harnesses P1 and P3 are examples of communication lines. The power lines 58 and 59 of the harnesses P1 and P3 are examples of power lines.

The connector 23a of the main circuit board 21 of the battery module 100M and the connector 23b of the sub circuit board 21a of the battery module 100c are connected via a harness P1. Thereby, one end of a pair of communication lines 56 and 57 of harness P1 is connected to a pair of connection lines L1 and L2 of main circuit board 21 of battery module 100M, respectively, and the other end of a pair of communication lines 56 and 57 of harness P1 Are connected to the pair of connection lines L5 and L6 of the sub circuit board 21a of the battery module 100c, respectively. Further, one end of the pair of power supply lines 58 and 59 of the harness P1 is connected to the pair of connection lines L3 and L4 of the main circuit board 21 of the battery module 100M, respectively, and the other end of the pair of communication lines 58 and 59 of the harness P1 is connected. The battery module 100c is connected to a pair of connection lines L7 and L8 on the sub circuit board 21a.

The connector 23a of the sub circuit board 21a of the battery module 100c and the connector 23b of the sub circuit board 21a of the battery module 100a are connected via a harness P2. Thereby, one end of a pair of communication lines 56 and 57 of harness P2 is connected to a pair of connection lines L1 and L2 of sub circuit board 21a of battery module 100c, respectively, and the other end of a pair of communication lines 56 and 57 of harness P2 Are connected to the pair of connection lines L5 and L6 of the sub circuit board 21a of the battery module 100a, respectively. Further, one end of the pair of power supply lines 58 and 59 of the harness P2 is connected to the pair of connection lines L3 and L4 of the sub circuit board 21a of the battery module 100c, respectively, and the other end of the pair of communication lines 58 and 59 of the harness P2 is connected. The battery module 100a is connected to a pair of connection lines L7 and L8 on the sub circuit board 21a.

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 via a harness P3. Thereby, one end of a pair of communication lines 56 and 57 of harness P3 is connected to a pair of connection lines L1 and L2 of sub circuit board 21a of battery module 100a, respectively, and the other end of a pair of communication lines 56 and 57 of harness P3 Are connected to the pair of connection lines L5 and L6 of the sub circuit board 21a of the battery module 100b, respectively. Further, one end of the pair of power supply lines 58 and 59 of the harness P3 is connected to the pair of connection lines L3 and L4 of the sub circuit board 21a of the battery module 100a, and the other end of the pair of communication lines 58 and 59 of the harness P3. The battery module 100b is connected to a pair of connection lines L7 and L8 on the sub circuit board 21a.

The connector 23a of the sub circuit board 21a of the battery module 100b and the connector 108 of the printed circuit board 105 of the battery ECU 101 are connected via a harness P4. Thereby, one end of a pair of communication lines 56 and 57 of harness P4 is connected to a pair of connection lines L1 and L2 of sub circuit board 21a of battery module 100b, respectively, and the other end of a pair of communication lines 56 and 57 of harness P4 Are connected to the pair of connection lines L9 and L10 of the printed circuit board 105 of the battery ECU 101, respectively. Further, one end of the pair of power supply lines 58 and 59 of the harness P4 is connected to the pair of connection lines L3 and L4 of the sub circuit board 21a of the battery module 100b, respectively, and the other end of the pair of communication lines 58 and 59 of the harness P4 is connected. The battery ECU 101 is connected to a pair of connection lines L11 and L12 of the printed circuit board 105, respectively.

Thus, the pair of communication lines 56 and 57 of the harnesses P1 to P4, the pair of connection lines L1 and L2 and the pair of connection lines L5 and L6 of the main circuit board 21, and the pair of connection lines L1 and the sub circuit boards 21a. A bus is configured by L2 and the pair of connection lines L5 and L6 and the pair of connection lines L9 and L10 of the printed circuit board 105. As a result, the MPU 106 of the battery ECU 101 can communicate with the second circuits 24 of the battery modules 100M and 100a to 100c.

Further, the pair of power lines 58 and 59 of the harnesses P1 to P4, the pair of connection lines L3 and L4 of the main circuit board 21, the pair of connection lines L3 and L4 and the pair of L7 and L8 of each sub circuit board 21a, and the printed circuit A pair of connection lines L11 and L12 of the substrate 105 are electrically connected. As a result, the electric power of the non-power battery 12 can be supplied to the second circuit 24 of the battery modules 100M, 100a to 100c through the switch circuit 107 of the battery ECU 101.

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 by the conductor wire 52 via the filter circuit 28 and a plurality of PTC (Positive （Temperature Coefficient) elements 60. Connected. 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 through the filter circuit 28 and the plurality of PTC elements 60 through the conductor line 52.

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 connected to the battery cell 10 having the highest potential of the high potential side battery cell group 10H included in the battery module 100c of FIG. Connected to the positive electrode. 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 modules 100a to 100c. As shown in FIG. 4, each of the battery modules 100a to 100c is a battery module except that it 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 same configuration as 100M. 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. The conductor lines 52 of the battery modules 100b and 100c are examples of state detection lines.

FIG. 5 is a block diagram showing configurations of the filter circuit 28, the low potential side first circuit 30L, and the third circuit 80. The low-potential-side first circuit 30L is composed of, for example, an ASIC (Application Specific Integrated Circuit). The low potential side first circuit 30 </ b> L includes the detection unit 20 and the communication circuit 32. 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 connected between two adjacent bus bars 40 of a plurality of battery cells 10 corresponding to each other by a conductor line 52 via a plurality of resistors R and PTC elements 60, or two adjacent bus bars 40, 40a is electrically connected. A capacitor C is connected between the two input terminals of each differential amplifier 20c. A filter circuit 28 is configured by the plurality of resistors R and capacitors C. The filter circuit 28 of the battery modules 100b and 100c is an example of a filter circuit.

In the present embodiment, the filter circuit 28 is a low-pass filter that removes a component having a frequency higher than the cutoff frequency. The current flowing through the plurality of battery cells 10 varies depending on the state of a load such as a motor connected to the battery system 500 of FIG. The cutoff frequency of the filter circuit 28 is set higher than the frequency of fluctuation of the current flowing through the plurality of battery cells 10. For example, the resistance value of the resistor R is set to 10 kΩ, and the capacitance value of the capacitor C is set to 0.1 μF. In this case, the cutoff frequency of the filter circuit 28 is 160 Hz.

Thereby, even when the currents flowing through the plurality of battery cells 10 fluctuate at a frequency higher than the cutoff frequency of the filter circuit 28, the terminal voltages of the plurality of battery cells 10 are stably detected by the low potential side first circuit 30L. be able to. Even if the input terminal of the differential amplifier 20c is short-circuited to the ground potential of the low-potential side battery cell group 10L due to a failure of the low-potential side first circuit 30L or the like, the resistance R of the filter circuit 28 causes the differential amplifier 20c to Excessive current is prevented from flowing.

The voltage between the two adjacent bus bars 40 or the voltage between the 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 the plurality of battery cells 10 in the low potential side battery cell group 10L from the A / D converter 20b of the detection unit 20. As will be described later, the communication circuit 32 acquires the digital value of the terminal voltage of the plurality of battery cells 10 in 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 the plurality of battery cells 10 of the low potential side battery cell group 10L and the digital value of the terminal voltage of the plurality of battery cells 10 of the high potential side battery cell group 10H to the insulating element 25. It transmits to the 2nd circuit 24 via (refer FIG. 2).

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. Thereby, the communication circuit 32 of the high potential side first circuit 30H is connected to the plurality of batteries 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). The digital value of the terminal voltage of the cell 10 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, a communication interface 244, and a power supply circuit 245. The processing unit 241 includes, for example, a CPU (Central Processing Unit) and is connected to the storage unit 242. The processing unit 241 is connected to the plurality of thermistors 11 shown in FIG. Accordingly, the processing unit 241 acquires the temperatures of the battery modules 100M and 100a to 100c.

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 connector 23a via a pair of connection lines L1 and L2, and is connected to the connector 23b via a pair of connection lines L5 and L6. 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.

The power supply circuit 245 is connected to the connector 23a via a pair of connection lines L3 and L4, and is connected to the connector 23b via a pair of connection lines L7 and L8. The electric power input to the connector 23a is supplied to the power supply circuit 245 through the pair of connection lines L3 and L4 and is output from the connector 23b through the pair of connection lines L3 and L4 and the pair of connection lines L7 and L8. The The power supply circuit 245 steps down the voltage between the connection lines L3 and L4. The processing unit 241, the storage unit 242, and the communication interface 244 operate with power output from the power supply circuit 245.

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 of the battery modules 100M, 100a to 100c of the battery system 500 decreases, the battery modules 100M, 100a to 100c can communicate with the battery ECU 101.

The second circuits 24 of the main circuit board 21 and the sub circuit board 21a are connected by a pair of communication lines 56 and 57 and a pair of power supply lines 58 and 59 of the harnesses P1 to P4 in FIG. Thereby, each 2nd circuit 24 can transmit cell information via a pair of conductor lines 56 and 57 by simple structure. In addition, power can be supplied from the non-power battery 12 to the power supply circuit 245 of each second circuit 24 via the pair of power supply lines 58 and 59 with a simple configuration.

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, 100a to 100c may calculate the charge amount of each battery cell 10. Further, the second circuit 24 of each of the battery modules 100M, 100a to 100c may detect overdischarge, overcharge, temperature abnormality, etc. 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 100a to 100c 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. Each of the battery modules 100a to 100c has a configuration similar to that of the battery module 100M except that it 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 to be described later, as shown 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. 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. 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. 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. The battery block 10BB of the battery modules 100b and 100c is an example of a battery block.

The battery block 10BB has end faces E1 and E2 parallel to the YZ plane, side faces E3 and E4 parallel to the ZX plane, and an upper face E5 and a lower face E6 parallel to the XY plane. The upper surface E5 of the battery block 10BB of the battery modules 100b and 100c is an example of the first surface, and the end surface E1 of the battery block 10BB of the battery modules 100b and 100c is an example of the second surface.

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, in battery block 10BB, the some battery cell 10 is integrally fixed in the state arrange | positioned so that it may rank with X direction. The main circuit board 21 is attached to the end surface frame 92 on the end surface E1 side of the battery block 10BB 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 E5 of the battery block 10BB so as to be arranged in the Y direction. The positive electrode 10a or the negative electrode 10b of the battery cell 10 of the battery modules 100b and 100c is an example of the electrode terminal of the first battery cell, and the positive electrode 10a or the negative electrode 10b of the battery cell 10 of the battery modules 100a and 100M is the first. It is an example of the electrode terminal of 2 battery cells. 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 the end surface frame 92 on the end surface E1 side of the battery block 10BB to the battery cells 10 adjacent to the end surface frame 92 on the end surface E2 side are referred to as the first to 18th 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 modules 100a to 100c, the power line 501 is directly connected to the bus bar 40a attached to the minus 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 on the end face E1 side of the battery block 10BB, and is 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, 100a to 100c are manufactured, a plurality of bus bars 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 40, 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 the battery modules 100a to 100c have the sub circuit board 21a instead of the main circuit board 21 and do not have the shunt resistor RS, the bus bars 40 and 40a and the first circuit on the low potential side in the battery modules 100a to 100c. The connection between 30L and the high potential side first circuit 30H is the same as the connection between the bus bars 40, 40a and 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 voltages of the plurality of battery cells 10 are detected.

The plurality of bus bars 40 and 40a are provided on the upper surface E5 of the battery block 10BB of the battery modules 100M and 100a to 100c in FIG. On the other hand, as will be described later, the harnesses P1 to P4 are provided on a surface different from the upper surface E5 of the battery block 10BB of the battery modules 100M and 100a to 100c. Therefore, even if noise is generated in the plurality of bus bars 40, 40a, mixing of noise into the harnesses P1 to P4 is reduced.

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 positive electrode 10a of the 18th battery cell 10 of the adjacent battery module 100c via the power line 501 of FIG. Thereby, the battery module 100M and the adjacent battery module 100c 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 filter. A circuit 28, connectors 23a and 23b, and a termination 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, the third circuit 80, and the filter circuit 28 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 via the filter circuit 28 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.

In the second mounting area 12G, the second circuit 24, the power supply circuit 245, and the connectors 23a and 23b are mounted. The second circuit 24 and the connector 23a are electrically connected on the main circuit board 21 by a pair of connection lines L1, L2 and a pair of connection lines L3, L4. The second circuit 24 and the connector 23b are electrically connected on the main circuit board 21 by a pair of connection lines L5 and L6 and a pair of connection lines L7 and L8. A termination resistor RT is mounted between the pair of connection lines L5 and L6.

The ground pattern GND2 is formed in the second mounting region 12G except for the mounting region of the second circuit 24 and the connectors 23a and 23b and the forming region of the plurality of connection lines. The ground pattern GND2 is held at the reference potential (ground potential) of the non-power battery 12 of FIG. Electric power is supplied to the second circuit 24 from the non-power battery 12 via the power supply circuit 245 of FIG.

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 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 filter circuit 28, the connectors 23a and 23b, and the connection terminal 22 on the sub circuit board 21a is 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 filter circuit 28, the connectors 23a and 23b, 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. Thus, 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 can be used as the power source for the second circuit 24. 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 includes an HV (High Voltage) connector 520 and a service plug 530 in addition to the battery module 100M, three battery modules 100a to 100c, the battery ECU 101, and the contactor 102 of FIG. Further prepare.

Among 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 surface portions 550a, 550b, 550c, and 550d, a bottom surface portion 550e, and an upper surface portion (not shown). 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. Further, the bottom surface portion 550e and the top surface portion face each other. An internal space is formed by the side surface portions 550a to 550d, the bottom surface portion 550e, and the upper surface portion.

In the internal space of 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.

FIG. 16 is an external perspective view of the battery module 100c in a state where the harness P1 is connected to the connector 23b of the sub circuit board 21a. As shown in FIGS. 15 and 16, one end of the harness P1 is connected to the connector 23b of the sub circuit board 21a of the battery module 100c. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P1 are bundled by a plurality of fixing members 95 and fixed to the bottom surface portion 550e of the casing 550 so as to extend along the side surface E4 of the battery block 10BB. The In this state, the other end of the harness P1 is connected to the connector 23a of the main circuit board 21 of the battery module 100M.

Similarly, one end of the harness P3 is connected to the connector 23b of the sub circuit board 21a of the battery module 100b. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P3 are bundled by a plurality of fixing members 95 and fixed to the bottom surface portion 550e of the casing 550 so as to extend along the side surface E4 of the battery block 10BB. The In this state, the other end of the harness P3 is connected to the connector 23a of the sub circuit board 21a of the battery module 100a.

Further, 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 harness P2. Connector 23a of sub circuit board 21a of battery module 100b is connected to battery ECU 101 via harness 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 harnesses 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 harness P4. The cell information detected by the second circuit 24 of the battery module 100c is given to the battery ECU 101 via the harnesses P2, P3, P4. The cell information detected by the second circuit 24 of the battery module 100M is given to the battery ECU 101 via the harnesses P1, P2, P3, P4.

(7) Effects of the Embodiment In the battery system 500 according to the present embodiment, the battery block 10BB of the battery module 100b is disposed between the sub circuit board 21a of the battery module 100a and the sub circuit board 21a of the battery module 100b. As shown, the battery modules 100a and 100b are arranged. A harness P3 that connects the sub circuit board 21a of the battery module 100a and the sub circuit board 21a of the battery module 100b is bundled by a plurality of fixing members 95 and extends along the side surface E4 of the battery block 10BB of the battery module 100b. It is fixed to the bottom surface portion 550e of the casing 550.

Thereby, the harness P3 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

Further, the battery modules 100c and 100M are arranged so that the battery block 10BB of the battery module 100c is arranged between the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M. The harness P1 that connects the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M is bundled by a plurality of fixing members 95 and extends along the side surface E4 of the battery block 10BB of the battery module 100b. It is fixed to the bottom surface portion 550e of the casing 550.

Thereby, the harness P1 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

Further, since the harnesses P1 and P3 and the conductor wire 52 do not contact each other, a short circuit does not occur between the harnesses P1 and P3 and the conductor wire 52. In particular, when the battery system 500 is mounted on an electric vehicle or the like, if the harnesses P1 and P3 and the conductor wire 52 are in contact with each other, the harnesses P1 and P3 and the conductor wire 52 rub against each other due to vibration during traveling. There is a possibility that the insulating coatings of P1, P3 and the conductor wire 52 are damaged. In the present embodiment, since the harnesses P1 and P3 and the conductor wire 52 do not contact each other, it is possible to prevent a short circuit from occurring between the harnesses P1 and P3 and the conductor wire 52.

(8) Feature of Embodiment The battery system according to the present embodiment includes a first battery module, a second battery module, and wiring, and the first battery module includes a plurality of first batteries. A battery block including cells, a first state detection circuit for detecting states of the plurality of first battery cells, an electrode terminal of the plurality of first battery cells, and a first state detection circuit. The battery block includes a first surface on which the electrode terminals of the plurality of first battery cells are arranged, and a second surface on which the first state detection circuit is provided. And the second battery module includes a plurality of second battery cells and a second state detection circuit for detecting a state of the plurality of second battery cells, the first state detection circuit And the second state The first and second battery modules are arranged so that at least the battery block is arranged between the detection circuit and the wiring so as to extend along a surface different from the first and second surfaces of the battery block. The first state detection circuit and the second state detection circuit are electrically connected.

In this battery system, the battery block of the first battery module is composed of a plurality of first battery cells. A plurality of first battery cell electrode terminals are arranged on the first surface of the battery block. A second state of the battery block is provided with a first state detection circuit for detecting the state of the plurality of first battery cells of the battery block. The electrode terminals of the plurality of first battery cells and the first state detection circuit are electrically connected by a plurality of state detection lines.

The first and second battery modules are arranged such that at least a battery block is arranged between the first state detection circuit and the second state detection circuit. The wiring is connected to the first state detection circuit and the second state detection circuit so as to extend along a surface different from the first and second surfaces of the battery block. Thereby, wiring and the electrode terminal of a some 1st battery cell do not mutually overlap. As a result, it is possible to reduce the complexity of the wiring work.

In the present embodiment, the first battery module further includes a first communication circuit for communication in a state detected by the first state detection circuit, and the second battery module includes the second battery module The communication device may further include a second communication circuit for communication in a state detected by the state detection circuit, and the wiring may include a communication line connected to the first communication circuit and the second communication circuit.

In this case, the first communication circuit and the second communication circuit are connected by a communication line. Thereby, the first communication circuit can transmit the state detected by the first state detection circuit via the communication line. The second communication circuit can transmit the state detected by the second state detection circuit via the communication line.

Further, in the present embodiment, the wiring may include a power supply line for power supply connected to the first communication circuit and the second communication circuit.

In this case, power can be supplied to the first communication circuit and the second communication circuit through the power supply line with a simple configuration.

In the present embodiment, the first battery module may further include a connection member that is provided on the first surface of the battery block and connects the electrode terminals of the plurality of first battery cells to each other.

In this case, a connecting member for connecting the electrode terminals of the first battery cells to each other is provided on the first surface of the battery block. Thereby, the connection member and the wiring are provided on different surfaces. Therefore, even if noise is generated in the connection member, the mixing of noise into the wiring is reduced.

In the present embodiment, the first battery module further includes a filter circuit that is connected to the plurality of state detection lines and removes a component having a frequency higher than a predetermined frequency. It is provided along the first surface of the block and may be connected to the connection member on the first surface.

In this case, a component having a frequency higher than a predetermined frequency is removed by the filter circuit. Thus, even when currents flowing through the plurality of first battery cells fluctuate at a frequency higher than a predetermined frequency, the first state detection circuit can stably detect the states of the plurality of first battery cells. it can.

[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. In the battery modules 100a, 100b, 100c, and 100M according to the second embodiment, the following two types of separators 200 and 200B are provided between adjacent battery cells 10 in order to effectively dissipate heat from each battery cell 10. Is placed. Separator 200, 200B is formed with resin, such as polybutylene terephthalate, for example.

FIG. 17 is an external perspective view of the battery module 100c according to the second embodiment. Battery modules 100a and 100b in the present embodiment have the same configuration as battery module 100c. The battery module 100M in the present embodiment has the same configuration as the battery module 100c except that the battery module 100M has the main circuit board 21 instead of the sub circuit board 21a and has a shunt resistor RS.

FIG. 18 is a perspective view of the separator 200. As shown in FIG. 18, the separator 200 has a substantially rectangular plate-like portion 201. The plate-like portion 201 has a cross-sectional shape bent in an uneven shape in the vertical direction. Hereinafter, the thickness (size of unevenness) of the plate-like portion 201 is referred to as unevenness width.

A long bottom surface portion 202 is provided so as to protrude horizontally from the lower end portion of the plate-like portion 201 to one surface side and the other surface side of the plate-like portion 201. Further, an uneven upper surface portion 205 is provided so as to protrude horizontally from the upper end portion of the plate-like portion 201 to one surface side and the other surface side of the plate-like portion 201. Further, a pair of upper side surface portions 203 and a pair of lower side surface portions 204 are provided so as to protrude from both side portions of the plate-like portion 201 to one surface side and the other surface side of the plate-like portion 201. The upper side surface portion 203 is provided in the vicinity of the upper end portion of the plate-like portion 201 and is connected to both end portions of the upper surface portion 205. The lower side surface portion 204 is provided in the vicinity of the lower end portion of the plate-like portion 201 and is connected to both end portions of the bottom surface portion 202.

FIG. 19 is a perspective view of the separator 200B. As shown in FIG. 19, it has the same configuration as the separator 200 of FIG. 18 except for the following points.

The wiring holding part 96a is formed so as to protrude from a part of the convex part of the plate-like part 201 to the side. In addition, the wiring holding portion 96b is formed so as to protrude from a part of the concave portion of the plate-like portion 201 to the side. A pair of wiring holding parts 96a and 96b constitutes a wiring holding part 96. A semicircular cutout is formed at the upper end of the wiring holding portion 96a. A semicircular cutout is formed at the lower end of the wiring holding portion 96b. The hole H is formed when the notch of the wiring holding part 96a and the notch of the wiring holding part 96b face each other. In the present embodiment, the harnesses P1 to P4 in FIG. 2 are held in the wiring holding portion 96 by being inserted through the hole H.

As shown in FIG. 17, a plurality of separators 200, 200B are arranged in parallel. In the present embodiment, a plurality (four in this example) of separators 200B are arranged at substantially equal intervals, and the remaining separators 200 are arranged between the plurality of separators 200B. As a result, the bottom surface portion 202, the upper side surface portion 203, the lower side surface portion 204, and the upper surface portion 205 (see FIGS. 18 and 19) of the adjacent separators 200 and 200B come into contact with each other. In this state, the battery cell 10 is accommodated between the plate-like portions 201 of the adjacent separators 200 and 200B.

In this case, one surface and the other surface of each battery cell 10 are in contact with the plate-like portions 201 of the adjacent separators 200 and 200B, respectively. Thereby, the distance between the adjacent battery cells 10 is maintained equal to the uneven width of the plate-like portion 201. A gap corresponding to the unevenness of the plate-like portion 201 is formed between adjacent battery cells 10. The gas introduced into the battery system 500 of FIG. 15 flows through the gap between the adjacent battery cells 10, so that the heat dissipation of each battery cell 10 is effectively performed.

FIG. 20 is an external perspective view of the battery module 100c in the battery system 500 according to the second embodiment.

As shown in FIG. 20, one end of the harness P1 is connected to the connector 23b of the sub circuit board 21a of the battery module 100c. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P1 are bundled by a wiring holding portion 96 formed on the plurality of separators 200B, and extend along the side surface E4 of the battery block 10BB. It is fixed at 10BB. In this state, the other end of the harness P1 is connected to the connector 23a of the main circuit board 21 of the battery module 100M in FIG.

Similarly, one end of the harness P3 is connected to the connector 23b of the sub circuit board 21a of the battery module 100b of FIG. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P3 are bundled by a wiring holding portion 96 formed on the plurality of separators 200B, and extend along the side surface E4 of the battery block 10BB. It is fixed at 10BB. In this state, the other end of the harness P3 is connected to the connector 23a of the sub circuit board 21a of the battery module 100a of FIG.

Similarly to the first embodiment, 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 harness P2. Connector 23a of sub circuit board 21a of battery module 100b is connected to battery ECU 101 via harness P4.

In the present embodiment, the harnesses P1 to P4 are not held in the wiring holding portion 96 of the separator 200B of the battery module 100M. Therefore, the separator 200 may be disposed between the adjacent battery cells 10 of the battery module 100M instead of the separator 200B.

As described above, in the battery system 500 according to the present embodiment, the harness P3 that connects the sub circuit board 21a of the battery module 100a and the sub circuit board 21a of the battery module 100b is connected to the wiring holding portions 96 of the plurality of separators 200B. And fixed to the battery block 10BB so as to extend along the side surface E4 of the battery block 10BB of the battery module 100b.

Thereby, the harness P3 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

The harness P1 that connects the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M is bundled by the wiring holding portions 96 of the plurality of separators 200B, and the side surface E4 of the battery block 10BB of the battery module 100b. Is fixed to the battery block 10BB so as to extend along the line.

Thereby, the harness P1 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

[3] Third Embodiment A battery system 500 according to a third embodiment will be described while referring to differences from the battery system 500 according to the first embodiment. FIG. 21 is an external perspective view of the battery module 100c in the battery system 500 according to the third embodiment.

As shown in FIG. 21, one end of the harness P1 is connected to the connector 23b of the sub circuit board 21a of the battery module 100c. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P1 are bundled by a fixing member 95 and fixed to one lower end frame 94 so as to extend along the side surface E4 of the battery block 10BB. In this state, the other end of the harness P1 is connected to the connector 23a of the main circuit board 21 of the battery module 100M in FIG.

Similarly, one end of the harness P3 is connected to the connector 23b of the sub circuit board 21a of the battery module 100b of FIG. The pair of communication lines 56 and 57 and the pair of power supply lines 58 and 59 of the harness P3 are bundled by a fixing member 95 and fixed to one lower end frame 94 so as to extend along the side surface E4 of the battery block 10BB. In this state, the other end of the harness P3 is connected to the connector 23a of the sub circuit board 21a of the battery module 100a of FIG.

The fixing member 95 is fixed to the lower end frame 94 with screws S. A screw hole for fixing the screw S is formed in one lower end frame 94 in the present embodiment. Here, since the thickness of the lower end frame 94 is larger than the length of the screw S, the screw S does not penetrate the lower end frame 94 and contact the battery cell 10.

Similarly to the first embodiment, 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 harness P2. Connector 23a of sub circuit board 21a of battery module 100b is connected to battery ECU 101 via harness P4.

Thus, in the battery system 500 according to the present embodiment, the harness P3 that connects the sub circuit board 21a of the battery module 100a and the sub circuit board 21a of the battery module 100b is bundled by the plurality of fixing members 95, The battery module 100b is fixed to one lower end frame 94 so as to extend along the side surface E4 of the battery block 10BB.

Thereby, the harness P3 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

The harness P1 that connects the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M is bundled by the wiring holding portions 96 of the plurality of separators 200B, and the side surface E4 of the battery block 10BB of the battery module 100b. It is fixed to one lower end frame 94 so as to extend along.

Thereby, the harness P1 and the plurality of conductor wires 52 do not overlap each other. As a result, it is possible to reduce the complexity of the wiring work.

[4] Fourth Embodiment (1) Configuration and Operation of Electric Vehicle Hereinafter, an electric vehicle and other moving bodies according to a fourth embodiment will be described. The electric vehicle according to the present embodiment includes battery system 500 according to any one of the first to third embodiments. In the following, an electric vehicle will be described as an example of an electric vehicle.

FIG. 22 is a block diagram illustrating a configuration of an electric vehicle including the battery system 500. As shown in FIG. 22, an electric automobile 600 according to the present embodiment includes a vehicle body 610 as a moving main body. The vehicle body 610 is provided with the non-power battery 12, the main control unit 300 and the battery system 500, the power conversion unit 601, the motor 602, the drive wheel 603, the accelerator device 604, the brake device 605, and the rotation speed sensor 606 of FIG. . The motor 602 and the drive wheel 603 are examples of 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 100a to 100c 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 100a to 100c 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, 100a to 100c, and provides the power to the battery modules 100M, 100a to 100c. Thereby, the battery modules 100M, 100a to 100c are charged.

(2) Effects in the Electric Vehicle As described above, the electric vehicle 600 according to the present embodiment is provided with the battery system 500 according to any one of the first to third embodiments. It is possible to reduce the complexity of the wiring work.

(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.

(4) Effects in other moving bodies As described above, the moving body according to the present embodiment is provided with the battery system 500 according to any one of the first to third embodiments. It is possible to reduce the complexity of the wiring work.

(5) Modified Example of Moving Body In the electric vehicle 600 of FIG. 22 or another moving body, instead of providing the battery ECU 101 in each battery system 500, the main control unit 300 has the same function as the battery ECU 101. Good.

[5] Fifth Embodiment A power supply device according to a fifth embodiment will be described. The power supply device according to the present embodiment includes a battery system 500 according to any one of the first to third embodiments.

(1) Configuration and Operation FIG. 23 is a block diagram illustrating a configuration of a power supply device including a battery system 500. As illustrated in FIG. 23, 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, the power supply apparatus 700 according to the present embodiment is provided with the battery system 500 according to any one of the first to third embodiments. It becomes possible to reduce complexity.

(3) Modified Example of Power Supply Device In the power supply device 700 of FIG. 23, 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.

23, a plurality of battery systems 500 are provided, but not limited to this, only one battery system 500 may be provided.

[6] Other Embodiments (1) In the first to third embodiments, the battery module 100M is provided with a shunt resistor RS, and the third circuit 80 and the insulating element 27 are mounted on the main circuit board 21. However, it is not limited to this. When the current detection device is provided in the battery system 500, the shunt resistor RS may not be provided in the battery module 100M, and the third circuit 80 and the insulating element 27 may not be mounted on the main circuit board 21.

(2) In the first to third embodiments, the power supply circuit 245 is provided in the second circuit 24, but the present invention is not limited to this. When it is not necessary to step down the voltage supplied to the second circuit 24, the power supply circuit 245 may not be provided in the second circuit 24.

(3) In the first to third embodiments, the battery is arranged such that the battery block 10BB of the battery module 100b is disposed between the sub circuit board 21a of the battery module 100b and the sub circuit board 21a of the battery module 100a. Although the modules 100a and 100b are arranged, the present invention is not limited to this. The battery modules 100a and 100b are arranged so that the battery block 10BB of the battery module 100a and the battery block 10BB of the battery module 100b are arranged between the sub circuit board 21a of the battery module 100b and the sub circuit board 21a of the battery module 100a. May be. In this case, harness P3 is provided to extend along side surface E4 of battery block 10BB of battery module 100a and side surface E3 of battery block 10BB of battery module 100b.

Similarly, the battery modules 100c and 100M are arranged between the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M so that the battery block 10BB of the battery module 100c is arranged. It is not limited to. The battery modules 100c and 100M are arranged such that the battery block 10BB of the battery module 100c and the battery block 10BB of the battery module 100M are arranged between the sub circuit board 21a of the battery module 100c and the main circuit board 21 of the battery module 100M. May be. In this case, the harness P1 is provided so as to extend along the side surface E4 of the battery block 10BB of the battery module 100c and the side surface E3 of the battery block 10BB of the battery module 100M.

(4) In the first to third embodiments, the third circuit 80 of the main circuit board 21 is electrically connected to both ends of the shunt resistor RS directly by the conductor wire 52, but is not limited thereto. The third circuit 80 may be electrically connected to both ends of the shunt resistor RS through the filter circuit 28 by the conductor line 52.

In this case, even when the current flowing through the shunt resistor RS fluctuates at a frequency higher than the cutoff frequency of the filter circuit 28, the voltage across the shunt resistor RS can be stably detected by the third circuit 80. Thereby, the electric current which flows into the some battery cell 10 is stably detectable.

(5) In the first and third embodiments, the battery module 100M, 100a to 100c is not provided with the separator 200, but is not limited thereto. Separator 200 may be provided in battery modules 100M and 100a to 100c. Thereby, the heat dissipation of each battery cell 10 of the battery modules 100M, 100a to 100c can be effectively performed.

(6) In the second embodiment, two types of separators 200 and 200B are provided in the battery modules 100M and 100a to 100c, but the present invention is not limited to this. One type of separator 200B may be provided in each of the battery modules 100M and 100a to 100c. Thus, the harnesses P1 to P4 can be bundled with the wiring holding portion 96 of the separator 200B of the battery modules 100M and 100a to 100c without preparing two types of separators.

(7) In the third embodiment, the fixing member 95 is fixed to one lower end frame 94 of the battery block 10BB, but is not limited thereto. For example, the fixing member 95 may be fixed to one upper end frame 93 of the battery block 10BB. In this case, a screw hole for fixing the screw S is formed in one upper end frame 93, and the fixing member 95 is fixed to the one upper end frame 93 by the screw S. Here, since the thickness of the upper end frame 93 is larger than the length of the screw S, the screw S does not penetrate the upper end frame 93 and contact the battery cell 10. Note that a screw hole may not be formed in one lower end frame 94.

(8) FIG. 24 is an exploded perspective view showing a configuration of a battery module 100M according to a modification of the first embodiment. In this example, the battery module 100M of FIG. 24 is used instead of the battery module 100M of FIG. The battery modules 100a to 100c in the first embodiment may have the same configuration as the battery module 100M in FIG.

24 will be described with respect to the battery module 100M of FIG. The battery module 100M of FIG. 24 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. Hereinafter, the surface of the lid member 70 facing the plurality of battery cells 10 is referred to as a back surface, and the surface of the lid member 70 on the opposite side is referred to as a front surface. In FIG. 24, the surface of the lid member 70 is directed upward. A plurality of openings 73 are formed in the lid member 70 so as to form two rows. The plurality of openings 73 correspond to the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10, respectively.

A wiring member 110 and a gas duct 111 including a pair of FPC boards 50 and a plurality of bus bars 40 and 40 a are attached to the back surface of the lid member 70. The gas duct 111 is arranged inside the plurality of bus bars 40, 40a arranged in two rows. Here, a groove corresponding to the wiring member 110 may be provided on the back surface of the lid member 70, and the wiring member 110 may be attached to the lid member 70 by fitting the wiring member 110 into the groove. Alternatively, the wiring member 110 may be attached to the lid member 70 with an adhesive or the like.

The plurality of battery cells 10 are housed in the casing CA, and the lid member 70 is fitted to the casing CA so as to close the upper opening of the casing CA. Thereby, the battery box BB that houses the battery module 100M is formed. In the casing CA of the battery box BB, an opening (not shown) for drawing out the harnesses P1 to P4 of FIG. 15 to the outside of the battery box BB is formed. 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.

When the battery box BB is formed, the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10 pass through the electrode connection holes 43 and 47 (see FIG. 10) of the plurality of bus bars 40 and 40a, and the plurality of lid members 70 Are inserted into the openings 73 respectively. In each opening 73 of the lid member 70, a nut (not shown) is fitted into the plus electrode 10a and the minus electrode 10b and tightened. Thereby, the plurality of bus bars 40, 40a are fixed to the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10, and the plurality of battery cells 10 are connected in series. The gas duct 111 is disposed so as to cover the gas vent valves 10v of the plurality of battery cells 10.

Thus, the wiring member 110, the gas duct 111, and the lid member 70 are integrally attached to the plurality of battery cells 10. In this case, the positioning when connecting the plurality of bus bars 40, 40a of the wiring member 110 to the corresponding electrodes 10a, 10b of the plurality of battery cells 10 is performed in a lump. Thereby, the battery module 100M can be easily assembled and simplified. 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.

Moreover, the strength of the battery module 100M is improved by forming the battery box BB that houses the battery module 100M. Further, since the plurality of battery cells 10 are fixed to the casing CA of the battery box BB and the lid member 70 is fitted to the casing CA, the plurality of battery cells 10 and the lid member 70 can be securely fixed. it can.

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

24, a plurality of bus bars 40, 40a and a pair of FPC boards 50 may be attached to the surface of the lid member 70 in the battery module 100M of FIG. In this case, the positive electrodes 10a and the negative electrodes 10b of the plurality of battery cells 10 are inserted into the electrode connection holes 43 and 47 of the plurality of bus bars 40 and 40a through the plurality of openings 73 of the lid member 70. In this state, the plurality of bus bars 40, 40a are fixed to the plus electrode 10a and the minus electrode 10b of the plurality of battery cells 10 by nuts or welding.

In the battery module 100M of FIG. 24, the lid member 70 is attached to the casing CA, but is not limited to this. For example, when the battery modules 100M and 100a to 100c are not accommodated in the casing CA, or when a plurality of battery modules 100M and 100a to 100c are accommodated in one casing, the lid member 70 is provided for each of the battery modules 100M and 100a to 100c. You may attach to battery block 10BB. In particular, when the gas duct 111, the bus bars 40, 40a, and the FPC board 50 are provided integrally with the lid member 70, nuts (not shown) are connected to the plus electrodes 10a of the battery cells 10 and the nuts (not shown) in each opening 73 in FIG. By screwing into the male screw of the negative electrode 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 gas duct 111, the bus bars 40 and 40a, the FPC board 50, and the lid member 70, the battery modules 100M and 100a to 100c can be easily assembled.

The battery modules 100M, 100a to 100c according to the second and third embodiments may also have the lid member 70 similarly to the battery module 100M of FIG. In this case, the battery modules 100M, 100a to 100c can be easily assembled.

(9) The moving 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.

In this electrical device, the load is driven by the electric power from the battery system 500. Since the battery system 500 is used for this electric device, it is possible to reduce the complexity of wiring work of the electric device.

[7] Correspondence relationship between each constituent element of claim and each part of embodiment The following describes an example of the correspondence between each constituent element of the claim and each part of the embodiment. It is not limited.

In the above embodiment, the battery modules 100b and 100c are examples of the first battery module, the battery modules 100a and 100M are examples of the second battery module, and the harnesses P1 and P3 are examples of wiring.

The battery cells 10 of the battery modules 100b and 100c are examples of the first battery cell, the battery block 10BB of the battery modules 100b and 100c is an example of the battery block, and the first circuit 30 of the battery modules 100b and 100c is the first. This is an example of the state detection circuit. The positive electrode 10a or the negative electrode 10b of the battery cell 10 of the battery modules 100b and 100c is an example of an electrode terminal of the first battery cell, and the conductor wire 52 of the battery modules 100b and 100c is an example of a state detection line. The upper surface E5 of the battery block 10BB of the battery modules 100b and 100c is an example of the first surface, and the end surface E1 of the battery block 10BB of the battery modules 100b and 100c is an example of the second surface.

The battery cells 10 of the battery modules 100a and 100M are examples of the second battery cell, and the first circuit 30 of the battery module 100a and the first circuit 30 and the third circuit 80 of the battery module 100M are second state detection circuits. It is an example. The positive electrode 10a or the negative electrode 10b of the battery cell 10 of the battery modules 100a and 100M is an example of the electrode terminal of the second battery cell.

The second circuit 24 of the battery modules 100b and 100c is an example of the first communication circuit, the second circuit 24 of the battery modules 100a and 100M is an example of the second communication circuit, and the communication lines 56 of the harnesses P1 and P3. 57 are examples of communication lines, and the power lines 58 and 59 of the harnesses P1 and P3 are examples of power lines. The bus bars 40 of the battery modules 100b and 100c are examples of connection members. The filter circuit 28 of the sub circuit board 21a of the battery modules 100b and 100c is an example of the filter circuit.

The battery system 500 is an example of a battery system, the motor 602 is an example of a motor, the driving wheel 603 is an example of a driving wheel, and the electric automobile 600 is an example of an electric vehicle.

The vehicle body 610 is an example of the moving main body. The motor 602 and the drive wheel 603 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.

Claims (10)

A first battery module;
A second battery module;
With wiring,
The first battery module includes:
A battery block including a plurality of first battery cells;
A first state detection circuit for detecting a state of the plurality of first battery cells;
A plurality of state detection lines that electrically connect the electrode terminals of the plurality of first battery cells and the first state detection circuit;
The battery block has a first surface on which electrode terminals of the plurality of first battery cells are arranged, and a second surface on which the first state detection circuit is provided,
The second battery module is
A plurality of second battery cells;
A second state detection circuit for detecting a state of the plurality of second battery cells,
The first and second battery modules are disposed such that at least the battery block is disposed between the first state detection circuit and the second state detection circuit,
The battery is electrically connected to the first state detection circuit and the second state detection circuit so as to extend along a surface different from the first and second surfaces of the battery block. system. The first battery module includes:
A first communication circuit for communicating in a state detected by the first state detection circuit;
The second battery module is
A second communication circuit for communicating in a state detected by the second state detection circuit;
The wiring is
The battery system according to claim 1, further comprising a communication line connected to the first communication circuit and the second communication circuit. The battery system according to claim 2, wherein the wiring includes a power supply line for supplying power connected to the first communication circuit and the second communication circuit. The first battery module includes:
The battery system according to any one of claims 1 to 3, further comprising a connection member that is provided on the first surface of the battery block and connects the electrode terminals of the plurality of first battery cells to each other. . The first battery module includes:
A filter circuit connected to the plurality of state detection lines and configured to remove a component having a frequency higher than a predetermined frequency;
The battery system according to claim 4, wherein the plurality of state detection lines are provided along the first surface of the battery block and connected to the connection member on the first surface. A battery system according to any one of claims 1 to 5;
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. A battery system according to any one of claims 1 to 5;
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. A battery system according to any one of claims 1 to 5;
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,
The power storage device according to claim 8,
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. A battery system according to any one of claims 1 to 5;
An electric device comprising a load driven by electric power from the battery system.

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