阅读说明：本技术 电路体和电池模块 (Circuit body and battery module ) 是由 太田孝生 岩田纯弥 于 2019-07-10 设计创作，主要内容包括：一种电路体,包括：多个导体和具有柔性并设置有导体的基板,其中基板包括电池布线部分以及一对连接器连接部分,该电池布线部分沿每行电极布线并且导体的一端分别连接到汇流条,设置在相应电池布线部分中的导体的另一端位于该对连接器连接部分中,该对连接器连接部分包括连接器安装部分,在该连接器安装部分处,该对连接器连接部分从相反方向被引导,并且在连接器安装部分中,该对连接器连接部分的导体的另一端交替布置,并且布置顺序对应于连接到导体的汇流条的电位顺序。(A circuit body, comprising: a plurality of conductors and a substrate having flexibility and provided with the conductors, wherein the substrate includes a battery wiring portion that is wired along each row of electrodes and one ends of the conductors are connected to bus bars, respectively, and a pair of connector connection portions in which the other ends of the conductors provided in the respective battery wiring portions are located, the pair of connector connection portions including connector mounting portions at which the pair of connector connection portions are guided from opposite directions, and in which the other ends of the conductors of the pair of connector connection portions are alternately arranged, and the arrangement order corresponds to a potential order of the bus bars connected to the conductors.)

1. A circuit body attached to a battery assembly in which electrodes of a plurality of battery cells are arranged in two rows, and two or more electrodes adjacent to each other in each row are connected by a conductive member, the circuit body comprising:

a substrate having flexibility and provided with a plurality of conductors, wherein

The substrate includes:

a battery wiring portion that is wired along each row of the electrodes and at which one ends of the plurality of conductors are connected to the conductive member, respectively, an

A pair of connector connection portions in which the other ends of the conductors provided in the respective battery wiring portions are located, respectively,

the pair of connector connection portions include connector mounting portions which are positions where the connector connection portions are guided and connected from opposite directions, the connectors are mounted on the connector mounting portions, and

in the connector mounting portion, the other ends of the conductors of the pair of connector connection portions are alternately arranged, and an arrangement order corresponds to a potential order of the conductive members connected to the conductors.

2. The circuit body of claim 1,

the substrate is formed of one piece and includes a plurality of substrate portions having the battery wiring portion and the connector connection portion.

3. The circuit body of claim 1,

the substrate is formed of two pieces, and

the connector mounting portions are located at positions where the connector connection portions of the two substrates are connected in opposite directions to each other.

4. The circuit body of claim 3,

the connector connection portions of the two pieces of the substrates are overlapped in the connector mounting portion, and

through holes for connecting the conductors of the substrate on the far side with respect to the connector and terminals of the connector are formed in the substrate on the near side with respect to the connector.

5. A battery module, comprising:

the circuit body of any one of claims 1 to 4,

a conductive member connected to one end of a conductor constituting the circuit body, and

a connector connected to the other end of the conductor.

Technical Field

The invention relates to a circuit body and a battery module.

Background

A battery module including a bus bar fixed to an electrode of each battery cell, a voltage detection line extending from the bus bar, and a connector for connecting the voltage detection line to an ECU are attached to a battery mounted in a hybrid vehicle or an electric vehicle. The ECU monitors the voltage of each battery cell detected through the voltage detection lines of the battery module, and adjusts the amount of charge of the battery cells and the like. Among these battery modules, there is ｃA battery module using ｃA printed circuit body having voltage detection lines made of conductor patterns to improve complicated wiring work of the voltage detection lines to the batteries (see, for example, JP- ｃA-2017-.

Disclosure of Invention

In a battery in which battery cells are connected in series (positive and negative electrodes are separated in each battery cell), bus bars fixed to connection points are arranged at alternately separated positions. In the battery in which the battery cells are connected in series, the voltage of the bus bar increases sequentially from one side of the circuit. Therefore, the voltage detection lines extending from the bus bar to the connector are not arranged in voltage order, which complicates the circuit by providing a circuit or the like in which the voltage detection lines are rearranged in voltage order on the ECU side.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a circuit body and a battery module capable of arranging voltage detection lines in order of voltage to simplify the circuit.

In order to achieve the above object, the present invention provides a circuit body and a battery module having the following features described in the form of configurations (1) to (5):

(1) a circuit body attached to a battery assembly, wherein electrodes of a plurality of battery cells are arranged in two rows, and two or more electrodes adjacent to each other in each row are connected by a conductive member, the circuit body comprising:

a plurality of conductors and a substrate having flexibility and provided with a plurality of conductors, wherein

The substrate includes:

a battery wiring portion which is wired along each row of the electrodes and at which one ends of a plurality of conductors are connected to the conductive member, respectively, an

A pair of connector connection portions in which the other ends of the conductors provided in the respective battery wiring portions are located, respectively,

the pair of connector connection portions include connector mounting portions which are positions where the connector connection portions are guided and connected from opposite directions and where the connectors are mounted, and

in the connector mounting portion, the other ends of the conductors of the pair of connector connection portions are alternately arranged, and the arrangement order corresponds to the order of potentials of the conductive members connected to the conductors.

(2) The circuit body according to the above (1), wherein,

the substrate is formed of one piece and includes a plurality of substrate portions having a battery wiring portion and a connector connection portion.

(3) The circuit body according to the above (1), wherein,

the substrate is formed of two pieces, and

the connector mounting portion is located at a position where the connector connection portions of the two substrates are connected in opposite directions to each other.

(4) The circuit body according to the above (3), wherein,

the connector connection portions of the two substrates are overlapped in the connector mounting portion, and

through holes for connecting conductors of the substrate on the far side with respect to the connector and terminals of the connector are formed in the substrate on the near side with respect to the connector.

(5) A battery module, comprising:

the circuit body according to any one of the above (1) to (4),

a conductive member connected to one end of a conductor constituting the circuit body, and

a connector connected to the other end of the conductor.

According to the battery module of the configuration of the above (1), the battery wiring portion of the circuit body is wired along each row of electrodes of the battery cells, and the conductor is connected to the bus bar fixed to the electrodes. Further, in the connector mounted on the connector mounting portion of the circuit body, the odd-numbered terminal is connected from one end side to the conductor of one battery wiring portion, and the even-numbered terminal is connected from one end side to the conductor of the other battery wiring portion. Thus, the conductors may be connected to the terminals of the connectors attached to the connector mounting portions in order of the voltage of the battery assembly. Therefore, when the connector is connected to an ECU that monitors the voltage of the battery cell and adjusts the amount of charge and the like, it is not necessary to provide a circuit or the like that rearranges the voltage detection lines in order of voltage on the ECU side, and thus the circuit can be simplified.

According to the circuit body configured in the above (2), since the circuit body is formed of one substrate including a plurality of substrate portions having the battery wiring portions and the connector connection portions (having the connector mounting portions to which the connectors are attached) routed along the respective rows of the electrodes of the battery cells, it is possible to improve the assembly efficiency of the battery assembly.

According to the circuit body of the configuration of the above (3), the battery wiring portions of the two substrates can be separately arranged and mounted with respect to the rows of the electrodes of the battery assembly. Thereby, the two sheets of substrates can be easily attached to the battery assembly without being affected by the width of the row of electrodes or the like. Further, the circuit body can be manufactured with high yield as compared with the case where the circuit body is formed of one substrate.

According to the circuit body of the configuration of the above (4), in the connector mounting portion where the two substrates overlap, the terminals of the connector can be firmly connected to the conductors of the substrate on the near side and the substrate on the far side with respect to the connector.

According to the battery module of the configuration of the above (5), in the connector attached to the connector connection portion, the terminals are arranged in order of the voltage of the battery assembly. Therefore, when the connector is connected to an ECU that monitors the voltage of the battery cell and adjusts the amount of charge and the like, it is not necessary to provide a circuit or the like that rearranges the voltage detection lines in order of voltage on the ECU side, and thus the circuit can be simplified.

According to the present invention, it is possible to provide a circuit body and a battery module capable of arranging voltage detection lines in voltage order to simplify the circuit.

In the foregoing, the present invention has been described briefly. Further, details of the present invention will be further clarified by reading a mode (hereinafter, referred to as "embodiment") for carrying out the present invention described below with reference to the drawings.

Drawings

Fig. 1 is a perspective view of a battery assembly incorporating a battery module according to an embodiment;

fig. 2 is a perspective view, as viewed from the rear, of a battery assembly in which the battery module according to the embodiment is assembled;

fig. 3 is a plan view showing a circuit body provided with a connector of a battery module;

fig. 4A and 4B are views for illustrating a circuit body provided with a connector of a battery module, wherein fig. 4A is a view of an arrow a in fig. 3, and fig. 4B is a view of an arrow B in fig. 3;

fig. 5 is a schematic cross-sectional view of a connector mounting portion of the circuit body;

fig. 6A to 6C are views showing a manufacturing process of a battery module, wherein fig. 6A to 6C are plan views of a circuit body;

fig. 7 is a perspective view, as viewed from the rear, of a battery assembly in which a battery module according to a modified embodiment is assembled; and

fig. 8 is a schematic sectional view of the connector mounting portion of the circuit body.

Detailed Description

Specific embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a perspective view of a battery assembly in which a battery module according to an embodiment is assembled. Fig. 2 is a perspective view, as viewed from the rear, of a battery assembly in which the battery module according to the embodiment is assembled.

As shown in fig. 1 and 2, a battery module 10 according to the first embodiment is assembled to a battery assembly 1. The battery pack 1 is used as a power source for an electric vehicle, a hybrid vehicle, or the like, for example. The battery assembly 1 is constituted by a battery unit 2, and the battery unit 2 is constituted by a plurality of secondary batteries.

The battery cells 2 are stacked on each other to constitute a battery assembly 1. Each cell 2 has a pair of electrodes 3 on the top. One of the pair of electrodes 3 is a positive electrode 3A, and the other is a negative electrode 3B. The positive electrode 3A and the negative electrode 3B are disposed at positions separated from each other in each battery cell 2. The battery cells 2 are alternately arranged such that the positive electrodes 3A and the negative electrodes 3B are adjacent to each other, that is, the positive electrode side and the negative electrode side of the adjacent battery cells 2 are in opposite directions. The battery module 10 is assembled between the array of electrodes 3 on top of the battery assembly 1.

The battery module 10 includes bus bars 20A and 20B, a circuit body 30, and a connector 40.

The bus bars 20A and 20B are formed by pressing a plate made of a conductive metal material such as copper or a copper alloy into a rectangular shape, and each has a terminal insertion hole 21. Further, the bus bars 20A and 20B are not limited to copper or copper alloy as long as they are conductive metal materials and can be made of, for example, aluminum or aluminum alloy. The bus bar 20A has two terminal insertion holes 21 through which the positive electrode 3A and the negative electrode 3B are inserted, and the bus bar 20B has one terminal insertion hole 21 through which the positive electrode 3A or the negative electrode 3B is inserted.

In the bus bar 20A, the adjacent positive electrodes 3A and negative electrodes 3B of the two battery cells 2 are inserted into the terminal insertion holes 21. Further, the bus bar 20A is fastened to the positive electrode 3A and the negative electrode 3B by nuts (not shown) screwed into the positive electrode 3A and the negative electrode 3B. As a result, the adjacent positive electrodes 3A and negative electrodes 3B of the two battery cells 2 are guided by the bus bars 20A. In the bus bar 20B, the positive electrodes 3A or the negative electrodes 3B of the two battery cells 2 disposed at the end portions are inserted into the terminal insertion holes 21. Further, the bus bar 20B is fastened to the positive electrode 3A or the negative electrode 3B by a nut (not shown) screwed into the positive electrode 3A or the negative electrode 3B. In the battery assembly 1, the battery cells 2 are connected in series by the bus bar 20A, and the portions to which the bus bars 20A and 20B are fastened serve as detection points P1 to P7 in order from the low potential side as points to detect voltage.

Fig. 3 is a plan view for illustrating a circuit body provided with a connector of a battery module. Fig. 4A and 4B are views for illustrating a circuit body provided with a connector of a battery module, wherein fig. 4A is a view of an arrow a in fig. 3, and fig. 4B is a view of an arrow B in fig. 3.

As shown in fig. 3 and fig. 4A to 4B, the circuit body 30 has a first substrate portion 31 and a second substrate portion 32. The circuit body 30 is a single substrate made of a Flexible Printed Circuit (FPC) having a base 35 and a conductor 36. The base 35 is constituted by a pair of flexible films bonded to each other, and a conductor 36 made of a conductive metal foil is disposed between the films.

The first substrate portion 31 and the second substrate portion 32 of the circuit body 30 have battery wiring portions 31a and 32a, connection portions 31b and 32b, and connector connection portions 31c and 32 c. In the first substrate portion 31 and the second substrate portion 32, the battery wiring portions 31a and 32a are respectively wired along the array of the two electrodes 3 in the upper portion of the battery assembly 1.

The battery wiring portions 31a and 32a of the first substrate portion 31 and the second substrate portion 32 have connection port portions 41 protruding from the edge portions, and one end of the conductor 36 is introduced into each of the connection port portions 41. In those connection port portions 41, there is no film on the upper side of the base 35, and one end of the conductor 36 is exposed on the upper surface. The bus bars 20A and 20B are overlapped and joined to the upper portions of those connection port portions 41. Thus, the bus bars 20A and 20B are electrically connected to the conductor 36. As a method of joining the bus bars 20A and 20B in the connection port portion 41, for example, welding, caulking, fastening with a screw, or the like can be used. Further, as the connection port portion 41, one end of the conductor 36 may be exposed on the lower surface. In this case, the bus bars 20A and 20B are overlapped and joined to the lower portion of the connection port portion 41.

In the first substrate portion 31 and the second substrate portion 32, the connection portions 31b and 32b extend horizontally from the battery wiring portions 31a and 32a, and the connector connection portions 31c and 32c extend upward with respect to the connection portions 31b and 32 b. The connector connection portion 32c of the second substrate portion 32 extends upward, further bends and points downward, and is connected to the connector connection portion 31c of the first substrate portion 31. The connector connection portion 32c of the second substrate portion 32 is connected to the connector connection portion 31c of the first substrate portion 31 from the opposite side. Then, the connecting portion between the connector connecting portion 31c of the first substrate portion 31 and the connector connecting portion 32c of the second substrate portion 32 is the connector mounting portion 45, and the connector 40 is mounted to the connector mounting portion 45. The connector connection portion 32c of the second substrate portion 32 is folded at two positions. As a result, the battery wiring portion 32a and the connection portion 32b of the second substrate portion 32 are arranged at positions distant from the battery wiring portion 31a and the connection portion 31b of the first substrate portion 31. When it is possible to make the battery wiring portions 31a and 32a of the first and second substrate portions 31 and 32 along the electrodes 3 of the battery cells 2, it is not necessarily necessary to provide the folding of the connector connection portion 32c of the second substrate portion 32.

In the first substrate section 31, the battery wiring portion 31a is wired along the detection points P1, P3, P5, and P7, and the respective conductors 36 become voltage detection lines L1, L3, L5, and L7 connected to the detection points P1, P3, P5, and P7. Further, in the second substrate portion 32, the battery wiring portion 32a is wired along the detection points P2, P4, and P6, and the respective conductors 36 become the voltage detection lines L2, L4, and L6 connected to the detection points P2, P4, and P6.

In the connector mounting portion 45 of the circuit body 30, the conductor 36 of the first substrate portion 31 and the conductor 36 of the second substrate portion 32 are led out from opposite sides to each other. Among these conductors 36, the voltage detection lines L2, L4, and L6 of the second substrate portion 32 are arranged between the voltage detection lines L1, L3, L5, and L7 of the first substrate portion 31. Therefore, in the connector mounting portion 45 of the circuit body 30, the conductors 36 are arranged in the order of the voltage detection lines L1 to L7 from one side. That is, in the connector mounting portion 45, the ends of the conductors 36 are arranged in voltage order.

Fig. 5 is a schematic cross-sectional view of the connector mounting portion of the circuit body.

As shown in fig. 5, in the connector mounting portion 45 of the circuit body 30, through holes 46 are formed at the positions of the conductors 36 of the voltage detection lines L1 to L7. The connector 40 has the same number of terminals T1 to T7 as the voltage detection lines L1 to L7, and those terminals T1 to T7 are inserted into the through-holes 46. Those terminals T1-T7 are then soldered to the conductor 36 and electrically connected.

The odd-numbered terminals T1, T3, T5 and T7 in the connector 40 are connected to the detection points P1, P3, P5 and P7 of the row of the electrodes 3 of the battery assembly 1 via the conductors 36 of the voltage detection lines L1, L3, L5 and L7 of the first substrate portion 31. The even-numbered terminals T2, T4, and T6 in the connector 40 are connected to the detection points P2, P4, and P6 of the row of the electrodes 3 of the battery assembly 1 via the conductors 36 of the voltage detection lines L2, L4, and L6 of the second substrate portion 32.

The connector 40 is connected to an Electronic Control Unit (ECU)5 (see fig. 1 and 2). Therefore, the voltage values of the voltage detection lines L1 to L7 of the circuit body 30 can be detected by the ECU 5.

Next, a process for manufacturing the above-described battery module 10 will be described. Fig. 6A to 6C are views illustrating a manufacturing process of the battery module, and fig. 6A to 6C are plan views of the circuit body.

As shown in fig. 6A, a circuit body 30 formed of a flexible circuit board having a first substrate portion 31 and a second substrate portion 32 is formed. In the circuit body 30, the connector connection portion 32c of the second substrate portion 32 is formed in a U-shape, and the first substrate portion 31 and the second substrate portion 32 are arranged in parallel with each other. Further, in the circuit body 30, the second substrate portion 32 is formed longer than the first substrate portion 31.

In the circuit body 30, the ends of the conductors 36 of the first substrate portion 31 and the second substrate portion 32 are drawn out and arranged from opposite sides in the connector mounting portion 45. The conductors 36 in the connector mounting portion 45 of the circuit body 30 are arranged in voltage order, that is, the voltage detection lines L1 to L7 are in order by the battery cells.

As shown in fig. 6B, the connector connection portion 32c of the second substrate portion 32 is folded and bent in the vertical direction and inverted. Further, as shown in fig. 6C, the connector connection portion 32C of the second substrate portion 32 is folded and bent in the vertical direction and is inverted. In this way, the length of the second substrate portion 32 is made substantially the same as the first substrate portion 31, and the first substrate portion 31 and the second substrate portion 32 are separated from each other.

Then, the bus bars 20A and 20B are joined to the connection port portions 41 of the first and second substrate portions 31 and 32 of the circuit body 30, and the connector 40 is attached to the connector mounting portion 45.

In the battery module 10 manufactured in this manner, the bus bars 20A and 20B are fastened and fixed to the electrodes 3 of the respective battery cells 2 of the battery assembly 1 by nuts, and the connector 40 is joined to the ECU 5. Thus, the ECU5 detects the voltage of the battery cells 2 of the battery assembly 1 and monitors the voltage of each battery cell 2 to adjust the amount of charge and the like.

As described above, according to the battery module 10 of the present embodiment, the battery wiring portions 31a and 32a of the circuit body 30 are wired along the respective rows of the electrodes 3 of the battery cells 2, and the conductors 36 are connected to the bus bars 20A and 20B fixed to the electrodes 3. Further, in the connector 40 mounted on the connector mounting portion 45 of the circuit body 30, the odd-numbered terminals T1, T3, T5 and T7 from one end side are connected to the conductor 36 of one battery wiring portion 31a, and the even-numbered terminals T2, T4 and T6 from one end side are connected to the conductor 36 of the other battery wiring portion 32 a. Thus, the conductor 36 may be connected to the terminals T1 to T7 of the connector 40 attached to the connector mounting portion 45 so as to be in the order of the voltage of the battery assembly 1. Therefore, when the connector 40 is connected to the ECU5 that monitors the voltage of the battery cell 2 and adjusts the amount of charge and the like, it is not necessary to provide a circuit or the like that rearranges the voltage detection lines L1 to L7 in order of voltage on the ECU5, and thus the circuit can be simplified.

Specifically, since the circuit body 30 is formed of one substrate including the first substrate portion 31 and the second substrate portion 32, the first substrate portion 31 and the second substrate portion 32 have the battery wiring portions 31a and 32a, the connector connection portions 31c and 32c (with the connector mounting portions 45 to which the connectors 40 are attached), and the connection portions 31b and 32b, which are wired along the respective rows of electrodes 3 of the battery cells 2, it is possible to improve the assembly efficiency of the battery assembly 1.

The present invention is not limited to the above-described embodiments, and may be appropriately modified, improved, and the like. In addition, the material, shape, size, number, arrangement position, and the like of each component in the above-described embodiments are arbitrary and are not limited as long as the present invention can be achieved.

For example, although the case where the circuit body 30 is formed of a single substrate made of a flexible circuit board is exemplified in the above-described embodiment, the circuit body 30 may be formed of a plurality of substrates. Here, a battery module according to a modified example in which the circuit body 30 is constituted by two sheets of substrates will be described.

Fig. 7 is a perspective view, as viewed from the rear, of a battery assembly in which the battery module according to the modified embodiment is assembled. Fig. 8 is a schematic sectional view of the connector mounting portion of the circuit body.

As shown in fig. 7, in the battery module 10A, the circuit body 30 is constituted by a first substrate 31A having a battery wiring portion 31A, a connection portion 31b, and a connector connection portion 31c, and a second substrate 32A having a battery wiring portion 32A, a connection portion 32b, and a connector connection portion 32 c. In these first substrate 31A and second substrate 32A, the connector connection portions 31c and 32c are connected in the directions opposite to each other, and the connection point becomes the connector mounting portion 45. In the connector mounting portion 45, the connector connection portions 31c and 32c overlap each other. The connector 40 is attached to the connector mounting portion 45 from the first substrate 31A.

As shown in fig. 8, in the connector connection portion 31c of the first substrate 31A, the through-hole 50 is formed between the conductors 36. In the connector 40 mounted on the connector mounting portion 45, the odd-numbered terminals T1, T3, T5 and T7 are connected to the conductors 36 of the voltage detection lines L1, L3, L5 and L7 of the first substrate 31A on the near side with respect to the connector 40. In the connector 40, the even-numbered terminals T2, T4, and T6 pass through the through holes 50 of the first substrate 31A on the near side with respect to the connector 40, and are connected to the conductors 36 of the voltage detection lines L2, L4, and L6 of the second substrate 32A on the far side with respect to the connector 40.

As described above, according to the battery module 10A including the circuit body 30 constituted by the first substrate 31A and the second substrate 32A, the battery wiring portions 31A and 32A of the two sheets of the first substrate 31A and the second substrate 32A can be separately arranged and mounted with respect to the row of the electrodes 3 of the battery assembly 1. Thereby, the two sheets of the first substrate 31A and the second substrate 32A can be easily attached to the battery assembly 1 without being affected by the width of the row of the electrodes 3 or the like. Further, the circuit body 30 can be manufactured with high yield as compared with the case where the circuit body 30 is formed of one substrate.

Further, the odd-numbered terminals T1, T3, T5 and T7 from one end side of the connector 40 are connected to the conductor 36 of the first substrate 31A on the near side with respect to the connector 40, and the even-numbered terminals T2, T4 and T6 from one end side are passed through the through holes 50 formed on the first substrate 31A on the near side with respect to the connector 40 and connected to the conductor 36 of the second substrate 32A on the far side with respect to the connector 40. Therefore, in the connector mounting portion 45 where the connector connection portions 31c and 32c of the two pieces of the first substrate 31A and the second substrate 32A overlap, the terminals T1 to T7 of the connector 40 can be reliably connected to the conductors 36 of the first substrate 31A on the near side and the second substrate 32A on the far side with respect to the connector 40.

In the above-described embodiment, the battery wiring portions 31a and 32a are wired within the respective rows of electrodes 3 of the battery cells 2. However, the battery wiring portions 31a and 32a may be wired outside each row of electrodes 3 of the battery cells 2.

The flexible circuit board serving as a board constituting the circuit body 30 may have a structure in which a conductor 36 is provided in at least one of the front surface and the rear surface of a base 35 made of a film having flexibility, and the at least one surface is coated with an insulating resin material.

In the above-described embodiment, each battery cell 2 constituting the battery module 10 is not limited to the rectangular shape as shown in fig. 1 and the like, and may be a cylindrical shape. In this case, since the positive electrode and the negative electrode are arranged at both end portions of each battery cell 2 in the cylindrical axial direction, for example, the first substrate 31 and the second substrate 32 are wired along the respective end portions.

In the above-described embodiment, the case where the positive electrodes 3A and the negative electrodes 3B of the battery cells 2 are alternately arranged adjacent to each other in the battery module 10 is described as an example, but the present invention is not limited thereto. The battery module 10 may be configured such that the positive electrodes 3A and the negative electrodes 3B of a plurality of adjacent battery cells 2 of the plurality of battery cells 2 are adjacent to each other, that is, the plurality of battery cells 2 are connected in parallel.

Here, the features of the circuit body and the battery module according to the embodiments of the present invention described above will be briefly summarized and listed in the following [1] to [5 ].

[1] A circuit body (30) attached to a battery assembly (1), wherein electrodes (3) of a plurality of battery cells (2) are arranged in two rows, and two or more electrodes adjacent to each other in each row are connected by a conductive member (a plurality of bus bars 20A, 20B), the circuit body (30) comprising:

a plurality of conductors (36) and a substrate (a first substrate portion 31, a second substrate portion 32, a first substrate 31A, a second substrate 32A) having flexibility and provided with a plurality of conductors, wherein

The substrate (first substrate portion 31, second substrate portion 32, first substrate 31A, second substrate 32A) includes:

battery wiring portions (31a, 32a) which are wired along each row of electrodes (3) and at which one ends of a plurality of conductors (36) are connected to the conductive members (the plurality of bus bars 20A, 20B), respectively, and

a pair of connector connection portions (31c, 32c) in which the other ends of the conductors (36) provided in the respective battery wiring portions (31a, 32a) are located, respectively,

the pair of connector connection portions (31c, 32c) includes a connector mounting portion (45), the connector mounting portion (45) being a position where the connector connection portions are guided and connected from opposite directions and the connector (40) is mounted, and

in the connector mounting portion (45), the other ends of the conductors (36) of the pair of connector connection portions (31c, 32c) are alternately arranged, and the arrangement order corresponds to the potential order of the conductive members (the plurality of bus bars 20A, 20B) connected to the conductors (36).

[2] The circuit body according to [1], wherein,

the substrate (first substrate portion 31, second substrate portion 32) is formed of one piece and includes a plurality of substrate portions having battery wiring portions (31a, 32a) and connector connection portions (31c, 32 c).

[3] The circuit body according to [1], wherein,

the substrates (first substrate 31A, second substrate 32A) are formed of two pieces, and

the connector mounting portion (45) is located at a position where the connector connection portions (31c, 32c) of the two substrates (substrate 31A, second substrate 32A) are connected in directions opposite to each other.

[4] The circuit body according to [3], wherein,

connector connection portions (31c, 32c) of two substrates (first substrate 31A, second substrate 32A) are overlapped in a connector mounting portion (45), and

a through hole (50) for connecting a conductor (36) of a substrate (second substrate 32A) on the far side with respect to the connector (40) and a terminal of the connector (40) is formed in a substrate (first substrate 31A) on the near side with respect to the connector (40).

[5] A battery module (10,10A) comprising:

the circuit body (30) according to any one of [1] to [4],

a conductive member (a plurality of bus bars 20A, 20B) connected to one end of a conductor (36) constituting the circuit body (30), and

a connector (40) connected to the other end of the conductor.