BUSBAR MODULE

Abstract

A bus bar module (10) to be mounted on a battery assembly (1), comprising: a first circuit body (20A) having a first circuit pattern (26); a second circuit body (20B) having a second circuit pattern (26); and electronic components each mounted on a first branch line portion (22) and a second branch line portion (22) to respectively connect the first and second wiring patterns (26) to the corresponding bus bar (40). The first and second wiring patterns (26) are electrically connected at an overlapping portion (23) of the first and second main line portions (21).Both the first circuit body (20A) and the second circuit body (20B) have a slit-shaped insulation hole portion (32) between adjacent connection points among a plurality of connection points, in each of which a first contact portion (25) and a second contact portion (25) are connected. The insulation hole portion (32) penetrates the overlapping portion (23) in a thickness direction.

Description

TECHNICAL FIELD

[0001] The present invention relates to a busbar module. STATE OF THE ART

[0002] In the related art, for example, a bus bar module is used to assemble into a battery assembly (that is, a battery module in which a plurality of cells are stacked and arranged) used as a drive power source mounted on an electric vehicle, a hybrid vehicle, or the like (see, for example, Patent Literature 1).

[0003] The busbar module described in Patent Literature 1 includes a plurality of busbars and voltage detection lines. The busbars are stacked, and each of the busbars connects a positive electrode and a negative electrode between adjacent cells. The voltage detection lines are respectively connected to the busbars and monitor the cells. The voltage detection line is configured to bundle a plurality of electrical wires. Each of the electrical wires has a general structure in which a core wire is covered with an insulating sheath. CITATION LISTPATENT LITERATURE

[0004] Patent literature 1: JP 2014-220 128 A SUMMARY OF THE INVENTION TECHNICAL PROBLEM

[0005] Generally, the battery cells included in the battery assembly expand and contract in a stacking direction due to heating associated with charging and discharging during operation, a temperature of an external environment, and the like. As a result, the battery assembly (battery module) is also deformed to expand and contract in the stacking direction of the battery cells. In addition, in manufactured battery assemblies, the size of the battery assembly in the stacking direction may generally vary due to a manufacturing tolerance in stacking and arranging the plurality of cells (i.e., manufacturing variation may occur). Therefore, the bus bar module is generally designed to have a certain tolerance in the length of the voltage detection line to cope with such deformation and manufacturing variation of the battery assembly.

[0006] However, in the related art busbar module described above, for example, when the number of stacked cells is increased to increase the capacity of the battery assembly, the number of electrical wires constituting the voltage detection line also increases. As a result, if the voltage detection line is formed by bundling these many electrical wires, the rigidity of the voltage detection line as a whole (and thus the rigidity of the busbar module) increases, and it may be difficult to improve the operability (assemblability) of mounting the busbar module to the battery assembly. For the same reason, it may also be difficult to expand and contract the busbar module to adequately cope with the deformation and manufacturing variations of the battery assembly.

[0007] An object of the present invention is to provide a busbar module that is excellently suited for mounting on a battery assembly and for forming deformations and manufacturing variations of the battery assembly. SOLUTION TO THE PROBLEM

[0008] To achieve the above-mentioned object, a bus bar module according to an embodiment of the present invention is a bus bar module to be attached to a battery assembly in which a plurality of individual cells are stacked, and the bus bar module comprises: a first circuit body formed of a flexible substrate having a first wiring pattern and comprising a first main line portion and a first branch line portion, the first main line portion being arranged to extend along a stacking direction of the plurality of individual cells, and the first branch line portion extending to branch from the first main line portion; a second circuit body formed of a flexible substrate having a second wiring pattern and comprising a second main line portion and a second branch line portion, the second main line portion being arranged to extend along the stacking direction, and the second branch line portion extending to branch from the second main line portion; a busbar configured to be connected to adjacent electrodes between the plurality of individual cells; an electronic component attached to each of the first branch line section and the second branch line section to connect each of the first circuit pattern and the second circuit pattern to the corresponding bus bar; and a holder expandable and contractible along the stacking direction and holding the first circuit body, the second circuit body and the bus bar, wherein the first wiring pattern comprises a plurality of first contact portions arranged in the stacking direction, the second wiring pattern comprises a plurality of second contact portions arranged in the stacking direction, the plurality of first contact portions and the plurality of second contact portions are electrically connected to each other at an overlap portion of the first main line portion and the second main line portion, and the first circuit body and the second circuit body each have a slit-shaped insulation hole portion between adjacent circuit connection portions among a plurality of circuit connection portions at which the first contact portions and the second contact portions are in contact, the insulation hole portion penetrating the overlap portion in a thickness direction. ADVANTAGEOUS EFFECTS OF THE INVENTION

[0009] According to the bus bar module of the embodiment of the present invention, the first circuit body and the second circuit body (hereinafter also referred to as "main lines") formed of the flexible substrates are integrated by electrically connecting the first contact portion of the first circuit pattern and the second contact portion of the second circuit pattern at the overlap portion of the first main line portion of the first circuit body and the second main line portion of the second circuit body. In other words, the first circuit body and the second circuit body are electrically connected to each other. The first branch line portion and the second branch line portion (hereinafter also referred to as "branch lines") extend to branch from the first main line portion and the second main line portion, respectively.Therefore, when the battery assembly expands and contracts in the stacking direction due to thermal deformation of each individual cell, each bus bar can move in the stacking direction of the individual cells by bending or the like of the branch line. Likewise, by bending or the like of the branch line, a variation in the size of the battery assembly in the stacking direction due to assembly tolerance of the individual cells can be absorbed. In other words, the bus bar module with the present configuration can easily cope with expansion and contraction (or contraction) and manufacturing variation of the battery assembly by deforming the branch line.Here, even if the flexible substrate contains a large number of circuit patterns, it is generally easily and flexibly deformed with much less force than an electrical wire used in the busbar module in the related art described above. Therefore, mountability to the battery assembly is improved. Accordingly, the busbar module with the present configuration is better suited to mounting to the battery assembly and adapting to the deformation and manufacturing variations of the battery assembly than the busbar module in the related art described above.

[0010] According to the bus bar module having the above configuration, the first circuit body and the second circuit body are manufactured as separate bodies and then electrically connected to each other. Therefore, compared with a case where the first circuit body and the second circuit body are formed from a single continuous flexible substrate, a length of each of the first circuit body and the second circuit body in the stacking direction is shortened. Therefore, a dedicated large-scale mounting jig is not required when attaching (i.e., mounting) the electronic components to the first branch line portion and the second branch line portion.In other words, even if the length and size of a final main line obtained by connecting the first circuit body and the second circuit body are not suitable for a general (universal) mounting jig, the first circuit body and the second circuit body can be connected to each other after the electronic component is properly mounted on a branch line circuit body using the general (universal) mounting jig for the first circuit body and the second circuit body. Therefore, the manufacturing cost of the bus bar module can be reduced.

[0011] According to the bus bar module having the above configuration, since the first circuit body and the second circuit body are manufactured as separate bodies and then electrically connected to each other, when the bus bar module is exposed to water or the like, liquid such as water may enter the overlap portion of the first main line portion of the first circuit body and the second main line portion of the second circuit body (between the first main line portion and the second main line portion). However, by providing the slit-shaped insulation hole portion between the adjacent connection points in which the first contact portion and the second contact portion are respectively connected, it is possible to prevent the occurrence of a problem in which the adjacent connection points become conductive (short-circuited) by the liquid. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. 1 is a perspective view showing a bus bar module according to an embodiment of the present invention; [ Fig. 2] Fig. 2 is a perspective view showing a battery assembly to which the Fig. 1 shown busbar module is to be mounted; [ Fig. 3] Fig. 3 is a perspective view showing a procedure when a first circuit body and a second circuit body comprising a Fig. 1 shown circuit body, and are housed in a holder; [ Fig. 4] Fig. 4 is a perspective view showing a state in which the first circuit body and the second circuit body comprising the Fig. 1 shown circuit body, and housed in the holder; [ Fig. 5] Fig. 5 is a top view of a portion in which a circuit connecting portion of the first circuit body and a circuit connecting portion of the second circuit body shown in Fig. 4 are connected to each other (the bracket is not shown, however); [ Fig. 6] Fig. 6 is a perspective view showing a procedure in which a first circuit body and a second circuit body included in a circuit body according to a first modification are connected and accommodated in a holder; [ Fig. 7] Fig. Fig. 7 is a perspective view showing a state in which the first circuit body and the second circuit body shown in Fig. 6, are connected and housed in the holder; and [ Fig. 8] Fig. 8 is a top view of a portion in which a circuit connecting portion of the first circuit body and a circuit connecting portion of the second circuit body shown in Fig. 7 are connected to each other (the bracket is not shown, however). DESCRIPTION OF THE EMBODIMENTS

[0012] A busbar module 10 according to an embodiment of the present invention will be described below with reference to the drawings. The busbar module 10 according to the present embodiment is used, for example, to form a long battery assembly 1 (a battery module in which a plurality of individual cells are stacked and arranged, see Fig. 2) to be assembled, which is used as a driving power source attached to an electric vehicle.

[0013] To simplify the description, “front”, “back”, “left”, “right”, “top” and “bottom” are used below as in Fig. 1 and the like. A "front-back direction," a "left-right direction," and an "up-down direction" are orthogonal to each other. The front-back direction corresponds to a stacking direction (see Fig. 1 and Fig. 2) a plurality of individual cells 2 included in the battery assembly 1. These directions are defined for convenience of description and do not necessarily correspond to a front-to-rear direction, a left-to-right direction, and an up-to-down direction of a vehicle when the busbar module 10 is mounted on the vehicle.

[0014] First, in preparation for the description of the busbar module 10, the battery assembly 1 to which the busbar module 10 is to be attached is described with reference to Fig. 2. As described in Fig. As shown in FIG. 2, the battery assembly 1 is formed by stacking the plurality of rectangular, flat, plate-shaped individual cells 2 in the front-back direction, each extending in the up-down and left-right directions. Each of the plurality of individual cells 2 includes a body 3 having a rectangular, flat plate shape and a positive electrode 4 and a negative electrode 5 projecting upward from both end portions in the left-right direction of an upper surface 6 of the body 3.

[0015] In the battery assembly 1, the plurality of cells 2 are stacked by positioning the positive electrode 4 and the negative electrode 5 of one of the single cells 2, which are adjacent in the front-to-back direction, in the left-to-right direction opposite to the positions of the positive electrode 4 and the negative electrode 5 of the other single cell 2, the plurality of single cells 2 are stacked such that the positive electrode 4 and the negative electrode 5 are arranged alternately in the front-to-back direction at each of a left end portion and a right end portion of an upper surface of the battery assembly 1.

[0016] The busbar module 10 is described below. As shown in the Fig. 1, Fig. 3 and Fig. 4, the busbar module 10 comprises a long circuit body 20 (see Fig. 1 and Fig. 3) extending in the direction from front to back, a plurality of busbars 40 (see Fig. 1), which is connected to a plurality of branch line sections 22 (see Fig. 3) of the circuit body 20, a plurality of electronic components 50 (see Fig. 3) mounted on the plurality of branch line sections 22, a bracket 60 (see Fig. 1 and Fig. 3) which holds the circuit body 20 and the busbars 40, and a cover 70 (see Fig. 1) which covers the circuit body 20. A main line section 21 and the branch line section 22 (see Fig. 3) of the circuit body 20 are also referred to as “main line” or “branch line”.

[0017] The circuit body 20 is formed from an easily bendable flexible substrate (FPC). As can be seen from Fig. 1 and Fig. 3, the circuit body 20 comprises a pair of left and right first circuit bodies 20A and a pair of left and right second circuit bodies 20B. The left and right first circuit bodies 20A extend in the front-to-back direction and are spaced apart from each other in the left-to-right direction. The left and right circuit bodies 20B are respectively connected to the rear sides of the pair of left and right circuit bodies 20A and extend in the front-to-back direction. The pair of left and right circuit bodies 20A and the pair of left and right circuit bodies 20B are coupled in the left-to-right direction by a coupling portion 28 (see Fig. 1). A connector 29 (see Fig. 1), which is electrically connected to an external voltage detecting device (not shown) or the like, is attached to a lower surface of the coupling portion 28.

[0018] Each of the circuit bodies 20A and 20B of the first circuit includes the strip-shaped main line portion 21 extending in the front-to-back direction and at least one (in this example, the branch line portion 22 extending from at least one (in this example, a plurality of) portions of the main line portion 21 branching to the left and right in the front-to-back direction (see Fig. 3). In this example, the branch line portion 22 extends from the main line portion 21 in a manner such that it has a U-shaped curved shape. Since the branch line portion 22 has the U-shaped curved shape, the flexibility of the branch line portion 22 in the front-back, left-right, and up-down directions is improved. A metal contact portion 24 is provided on an upper surface of a distal end portion of the branch line portion 22 to be exposed to the outside (see Fig. 3).

[0019] By connecting a circuit connecting portion 23 provided at a rear end portion of the main line 21 of the first circuit body 20A and the circuit connecting portion 23 provided at a front end portion of the main line 21 of the second circuit body 20B, the circuit body 20 is formed such that the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body 20B extend continuously in a row in the front-to-rear direction. A detailed structure of the circuit connecting portion 23 of each first circuit body 20A and each second circuit body 20B and a method of connecting between the circuit connecting portions 23 will be described later.

[0020] An entire surface of each first circuit body 20A and each second circuit body 20B is formed of a layer of resin, except for a portion (see Fig. 3), in which the 24 provided on the branch line section 22 is exposed, and sections (see Fig. 3), in which contacts 25, which will be described later and which are provided on the circuit connecting portion 23, are exposed. Both the first circuit body 20A and the second circuit body 20B include a plurality of wiring patterns 26 (see Fig. 3). The circuit pattern 26 is a strip-shaped copper conductor extending along the main line portion 21 and the branch line portion 22. Both the first circuit body 20A and the second circuit body 20B are so-called "single-sided flexible substrates (single-sided FPCs)" with a single layer of conductive lines. The plurality of wiring patterns 26 are arranged on the single layer of wiring of each first circuit body 20A and each second circuit body 20B. However, each first circuit body 20A and each second circuit body 20B may be a "double-sided FPC."

[0021] At a position where the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B are connected to each other, at least one (in this example, six) circuit pattern 26 belonging to the first circuit body 20A and at least one (in this example, six) circuit pattern 26 belonging to the second circuit body 20B are respectively and independently connected to each other (see Fig. 3).

[0022] Each of the plurality of circuit patterns 26 comprising the first circuit body 20A and the second circuit body 20B is electrically connected to the connector 29 mounted on the coupling portion 28 through the contact portion 24 of a corresponding one of the branch line portions 22, the corresponding branch line portion 22, the main line portion 21, and the coupling portion 28 in this order. Accordingly, the contact portions 24 of the branch line portions 22 belonging to the first circuit body 20A and the second circuit body 20B are individually conductively connected to the external voltage detection device via the connector 29 attached to the coupling portion 28.

[0023] The distal end portion of the branch line section 22 is mounted with the electronic component 50 and connected to an elongated, flat, plate-shaped metal connection terminal 41 which is connected to the bus bar 40 (see Fig. 3 and the like). The connecting terminal 41 may be a part of the substantially rectangular flat busbar 40 in plate form made of metal (see Fig. 1) or a member separated from the bus bar 40 and connected to the bus bar 40 by soldering or the like. The electronic component 50 is typically a chip fuse. The electronic component 50 is attached to the distal end portion of the branch line portion 22 by soldering or the like to connect the contact portion 24 of the branch line portion 22 to the connection terminal 41. Accordingly, in the branch line portion 22, the contact portion 24 (i.e., the wiring pattern 26 extending from the contact portion 24) and the connection terminal 41 (i.e., the bus bar 40) are electrically connected via the electronic component 50.

[0024] The mounting of the electronic component 50 on the branch wiring portion 22 is performed individually on the branch wiring portion 22 belonging to the first circuit body 20A and the branch wiring portion 22 belonging to the second circuit body 20B in a state before the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B are connected to each other (that is, in a state where both the first circuit body 20A and the second circuit body 20B are independent). Accordingly, compared with a case where the first circuit body 20A and the second circuit body 20B are formed of a common (single) flexible substrate, a length of each of the first circuit body 20A and the second circuit body 20B in the front-to-back direction is shortened, and thus a large mounting jig is not required.In other words, since the first circuit body 20A and the second circuit body 20B are separate bodies, the electronic component 50 can be appropriately mounted on the branch line portion 22 regardless of the length and size of the long circuit body 20 obtained by connecting the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B to each other, and the manufacturing cost of the bus bar module 10 can be reduced.

[0025] The following describes the detailed structure of the circuit connecting portion 23 of each of the first circuit bodies 20A and the second circuit bodies 20B and the procedure of connection between the circuit connecting portions 23. As shown in Fig. 3, on an upper surface of the circuit connecting portion 23 of the first circuit body 20A, a plurality of (in this example, six) metal contact portions (pads) 25 are provided, which are arranged in such a manner as to be spaced apart from each other in the front-to-back direction and exposed to the outside. Wiring patterns 26 extend from the contact portions 25, respectively. More specifically, the wiring pattern 26 for each of the three contact portions 25 on a front side (proximal end side of the circuit connecting portion 23) among the six contact portions 25 extends from the contact portion 25 to one side (left side) in a width direction (left-right direction) of the main line portion 21 of the first circuit body 20A, and then extends forward.For each of the three contact portions 25 on a rear side (remote side of the circuit connecting portion 23) among the six contact portions 25, the wiring pattern 26 extends from the contact portion 25 to the other side (right side) in the width direction (left-right direction) of the main line portion 21 of the first circuit body 20A and then extends forward.

[0026] In this way, by arranging the extension portions of the plurality of wiring patterns 26 extending from the plurality of contact portions 25 in a split manner in the left-right direction, it is possible to contribute to improving the degree of freedom of pattern design of the extension portions of the wiring patterns 26 extending from the contact portions 25, miniaturizing the circuit connecting portion 23 (i.e., the first circuit body 20A), and the like. On the upper surface of the circuit connecting portion 23 of the first circuit body 20A, a metal dummy contact portion (land) 27 is provided, exposed at an outside position without interfering with the contact portions 25 and the circuit patterns 26. The dummy contact portion 27 is not (electrically) connected to the circuit pattern 26 (i.e., the bus bar 40).In the circuit connecting portion 23 of the first circuit body 20A, hole portions 31 extending in the thickness direction (up-down direction) of the circuit connecting portion 23 are formed at a plurality of positions (two positions in this example) that do not interfere with the contact portions 25, the wiring patterns 26, and the dummy contact portion 27, respectively.

[0027] In the circuit connecting portion 23 of the first circuit body 20A, slit-shaped through holes (hereinafter referred to as “insulation hole portions 32”) extending in the thickness direction (top-down direction) of the circuit connecting portion 23 are respectively formed to extend in the left-right direction at positions (five positions) each located between the contact portions 25 adjacent to each other in the front-back direction among the plurality of (six) contact portions 25 arranged in the front-back direction (see Fig. 3 and Fig. 5). Accordingly, it is possible to prevent the occurrence of a problem in which the adjacent contact portions 25 become conductive (short-circuited) due to moisture when the busbar module 10 is exposed to water or the like. Two insulation hole portions 32 of the five insulation hole portions 32 communicate with the two hole portions 31, respectively. Accordingly, the diameter of the insulation hole portion 32 is increased, and the short-circuit prevention effect described above can be further enhanced.

[0028] On a lower surface of the circuit connecting portion 23 of the second circuit body 20B, a plurality (in this example, six) of the metal contact portions (pads) 25 are provided so as to be arranged in a spaced array in the front-to-back direction and exposed to the outside, and correspond to the plurality of contact portions 25 of the first circuit body 20A. The wiring patterns 26 extend from the contact portions 25, respectively. More specifically, the wiring pattern 26 for each of the three contact portions 25 on a front side (remote end side of the circuit connecting portion 23) among the six contact portions 25 extends from the contact portion 25 to the other side (right side) in the width direction (left-right direction) of the main line portion 21 of the second circuit body 20B, and then extends rearward.For each of the three contact portions 25 on a rear side (proximal end side of the circuit connecting portion 23) among the six contact portions 25, the wiring pattern 26 extends from the contact portion 25 to one side (left side) in the width direction (left-right direction) of the main line portion 21 of the second circuit body 20B and then extends rearward.

[0029] In this way, by disposing the extension portions of the plurality of wiring patterns 26 extending from the plurality of contact portions 25 in a split manner in the left-right direction, it is possible to contribute to improving the degree of freedom of pattern design of the extension portions of the wiring 26 extending from the contact portions 25, miniaturizing the circuit connecting portion 23 (i.e., the second circuit body 20B), and the like. On the lower surface of the circuit connecting portion 23 of the second circuit body 20B, the dummy metal contact portion (land) 27 is provided so as to be exposed at an outside position without interfering with the contact portions 25 and the circuit patterns 26, and corresponds to the dummy contact portion 27 of the first circuit body 20A. The dummy contact section 27 is not (electrically) connected to the circuit pattern 26 (iethe bus bar 40). In the circuit connecting portion 23 of the second circuit body 20B, the hole portions 31 penetrating in the thickness direction (top-down direction) of the circuit connecting portion 23 are each formed at a plurality of positions (two positions in this example) that do not interfere with the contact portions 25, the circuit patterns 26, and the dummy contact portion 27, and correspond to the plurality of hole portions 31 of the first circuit body 20A.

[0030] In the circuit connecting portion 23 of the second circuit body 20B, the slit-shaped insulating hole portions 32 are formed in the thickness direction (top-bottom direction) of the circuit connecting portion 23, respectively, to extend in the left-right direction at positions (five positions), each of which is located between the contact portions 25 adjacent to each other in the front-back direction among the plurality (six) contact portions 25 arranged in the front-back direction (see Fig. 3 and Fig. 5). Accordingly, it is possible to prevent the occurrence of a problem in which the adjacent contact portions 25 become conductive (short-circuited) due to moisture when the busbar module 10 is exposed to water or the like. Two insulation hole portions 32 of the five insulation hole portions 32 communicate with the two hole portions 31, respectively. Accordingly, a diameter of the insulation hole portion 32 is increased, and the above-described short-circuit prevention effect can be further enhanced.

[0031] The operation of connecting the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B to each other is carried out using a plurality of (in this example, two) projections 61a (see Fig. 3) is carried out at a plurality of (in this example, two) positions on a bottom wall of a circuit body holding portion 61 (see Fig. 3) described later in the holder 60, and which correspond to the plurality of hole portions 31 of the first circuit body 20A and the second circuit body 20B. That is, first, in a state where the circuit connecting portion 23 of the first circuit body 20A is arranged below the circuit connecting portion 23 of the second circuit body 20B, each of the plurality of projections 61a is inserted from below into one of the plurality of hole portions 31 of the first circuit body 20A and a corresponding one of the plurality of hole portions 31 of the second circuit body 20B in this order (see Fig. 4). Accordingly, the first circuit body 20A and the second circuit body 20B are housed in the holder 60 (circuit body holding portion 61), and a state is obtained in which the plurality of hole portions 31 of the first circuit body 20A and the plurality of hole portions 31 of the second circuit body 20B are aligned to overlap each other in the up-down direction.

[0032] Next, the plurality of contact portions 25 of the first circuit body 20A and the plurality of contact portions 25 of the second circuit body 20B are respectively and independently soldered, and the dummy contact portions 27 of the first circuit body 20A and the dummy contact portions 27 of the second circuit body 20B are soldered. Typically, the soldering can be performed by a method (the so-called pulse heating method) in which a paste-like solder paste is applied between the contact portions 25 arranged opposite each other in the top-down direction and between the dummy contact portions 27 arranged to face each other in the top-down direction, then a heater chip that can heat the solder to a temperature at which the solder can be melted is pressed against a portion to be soldered, and soldering is performed.The soldering may be performed by a reflow soldering method using a heating furnace. The electrical connection between the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B may be performed using a conductive adhesive instead of the soldering described above.

[0033] Accordingly, at the portion where the circuit connecting portion 23 of the first circuit body 20A and the circuit connecting portion 23 of the second circuit body 20B are connected to each other, the plurality of wiring patterns 26 belonging to the first circuit body 20A and the plurality of wiring patterns 26 belonging to the second circuit body 20B are respectively and independently electrically connected and mechanically integrated. The dummy contact portion 27 of the first circuit body 20A and the dummy contact portion 27 of the second circuit body 20B are mechanically integrated with each other using solder, a conductive adhesive, or the like. Accordingly, the first circuit body 20A and the second circuit body 20B can be more firmly integrated.

[0034] In this way, by utilizing the hole portion 31 of the first circuit body 20A, the hole portion 31 of the second circuit body 20B, and the projection 61a of the holder 60, it is possible to jointly perform an operation of accommodating the first circuit body 20A and the second circuit body 20B in the holder 60 (the circuit body holding portion 61) and an operation of electrically connecting the contact portion 25 (circuit pattern 26) of the first circuit body 20A and the contact portion 25 (circuit pattern 26) of the second circuit body 20B to each other, while preventing a deviation in the position or the like of the two contact portions 25 by the projection 61a.When an unintentional external force is applied to the circuit body 20 (more specifically, to the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body 20B) after connection, the external force is absorbed by the protrusions 61a. Therefore, it is possible to prevent the external force from being applied to a circuit connection portion of the contact portion 25 (the wiring pattern 26) of the first circuit body 20A and the contact portion 25 (the wiring pattern 26) of the second circuit body 20B. Accordingly, the reliability of the electrical connection between the first circuit body 20A and the second circuit body 20B can be improved.

[0035] Next, the bracket 60 will be described. The bracket 60 is a molded product and includes, as shown in Fig. 1, the circuit body 20 integrally comprises a pair of left and right strip-shaped circuit body support portions 61 spaced apart in the left-right direction and extending in the front-back direction, and a plurality of coupling portions 62 that couple the pair of left and right circuit body support portions 61 in the left-right direction at a plurality of positions in the front-back direction. The pair of left and right first circuit bodies 20A (main line portions 21 and branch line portions 22) are respectively disposed on the pair of left and right circuit body support portions 61. The pair of left and right second circuit bodies 20B (main line portions 21 and branch line portions 22) of the circuit body 20 are respectively disposed on the pair of left and right circuit body support portions 61.

[0036] Specifically, each of the two circuit body holding parts 61 extending in the front-to-back direction includes a plurality of divided bodies (not shown) arranged side by side in the front-to-back direction, and expansion and contraction parts (not shown) each connecting the divided bodies adjacent to each other in the front-to-back direction in the front-to-back direction. Each of the expansion and contraction parts has a shape that can easily expand and contract in the front-to-back direction due to elastic deformation. Therefore, the pair of circuit body holding parts 61 are expandable and contractible in the front-to-back direction. As described above, a plurality of (two) projections 61a are provided on the bottom wall of the circuit body holding part 61 (see Fig. 3).

[0037] For each pair of left and right holding sections 61 for the circuit body, a holding section 64 for the busbar (see Fig. 1) is integrally provided so as to be arranged adjacent to the outer side in the front-to-rear direction of each of the plurality of divided bodies. That is, the plurality of busbar holding portions 64 are arranged side by side in the front-to-rear direction on the outer side in the left-to-right direction of each pair of left and right circuit body holding portions 61. Since each of the busbar holding portions 64 is provided in a corresponding one of the divided bodies, an interval in the front-to-rear direction between the busbar holding portions 64 adjacent to each other in the front-to-rear direction can be changed as a function of the portion of expansion and contraction.

[0038] The busbar 40 is housed in a corresponding one of the busbar holding portions 64. When the bracket 60 is attached to the battery assembly 1, the busbar 40 housed in the busbar holding portion 64 is conductively connected to the corresponding positive electrode 4 and negative electrode 5, which are adjacent to each other in the front-rear direction on the top side of the battery assembly 1.

[0039] Next, the cover 70 will be described. The cover 70, which is a resin-molded product, serves to cover the circuit bodies 20, that is, the first circuit bodies 20A (main line sections 21 and branch line sections 22) and the second circuit bodies 20B (main line sections 21 and branch line sections 22) arranged on the pair of left and right circuit body holding sections 61 of the bracket 60, which are long in the front-rear direction (see Fig. 1). Therefore, the cover 70, as shown in Fig. 1, has a strip shape shaped to be long in the front-to-back direction.

[0040] In a mounting completion state in which the busbar module 10 has been mounted to the battery assembly 1, in the battery assembly 1, the plurality of stacked single cells 2 are electrically connected in series via the plurality of busbars 40. The busbar 40 is conductively connected to the external voltage detection device via the electronic component 50 mounted on a corresponding branch line portion 22, the wiring pattern 26 extending from the corresponding branch line portion 22 (contact portion 24), and the connector 29 mounted on the coupling portion 28, in this order. Accordingly, a voltage (potential) of the busbar 40 can be individually detected by the external voltage detection device.If, for any reason, an excessive current equal to or greater than a rated current flows in the electronic component 50, a fuse function of the electronic component 50 is exerted, and thus an electrical connection between the bus bar 40 and the wiring pattern 26 is interrupted by the electronic component 50. Accordingly, the excessive current is prevented from flowing into the external voltage detection device, so that the external voltage detection device can be protected.

[0041] In a use state of the battery assembly 1 to which the bus bar module 10 has been attached, each of the individual cells 2 included in the battery assembly 1 may expand or contract in the stacking direction (front-to-back direction) due to operating heat associated with charging and discharging, an external ambient temperature, and the like. As a result, the battery assembly 1 may deform to expand and contract in the stacking direction (front-to-back direction). Furthermore, the size of the battery assembly 1 in the stacking direction (front-to-back direction) may vary for the manufactured battery assemblies 1 (a manufacturing variation may occur) due to an assembly tolerance when the plurality of individual cells 2 are stacked and arranged.

[0042] In this regard, in the bus bar module 10, even if the expansion and contraction of the battery assembly 1 occurs in the stacking direction (front-back direction) due to the thermal deformation of each cell 2 and the manufacturing variation of the battery assembly 1, the expansion and contraction due to the thermal deformation and the manufacturing variation of the battery assembly 1 can be easily absorbed because each of the plurality of expansion and contraction portions of the bracket 60 expands and contracts in the front-back direction and each branch line portion 22 formed of the flexible substrate can be easily bent.

[0043] As described above, according to the bus bar module 10 of the present embodiment, the first circuit body 20A and the second circuit body 20B (main lines) formed of the flexible substrates are connected to each other by electrically connecting the circuit pattern 26 of the first circuit body 20A and the circuit pattern 26 of the second circuit body 20B at an overlapping portion (the circuit connection portions 23) of the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body 20B. In other words, the first circuit body 20A and the second circuit body 20B are electrically connected. The branch line portions 22 (branch lines) extend to branch from the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body 20B.When the battery assembly 1 expands and contracts in the stacking direction (front-to-back direction) due to thermal deformation of each of the individual cells 2, each of the bus bars 40 can move in the stacking direction of the individual cells 2 by bending or the like of the branch line. Likewise, by bending or the like of the branch line, a change in the size of the battery assembly 1 in the stacking direction (front-to-back direction) due to the assembly tolerance of the individual cells 2 can be absorbed. In other words, the bus bar module 10 according to the present embodiment can easily cope with the expansion and contraction and the manufacturing deviation of the battery assembly 1 due to the deformation of the branch line.Here, the flexible substrate, even when including a large number of circuits, is generally easily and flexibly deformed with a much smaller force than an electric wire used in the bus bar module in the related art described above. Therefore, the mountability to the battery assembly 1 is improved. Accordingly, the bus bar module 10 according to the present embodiment is more adaptable to the battery assembly 1 and adaptable to the deformation and manufacturing variations of the battery assembly 1 than the bus bar module according to the related art described above.

[0044] Furthermore, the first circuit body 20A and the second circuit body 20B are manufactured as separate bodies and then electrically connected to each other. Therefore, if the first circuit body 20A and the second circuit body 20B are formed from a single continuous flexible substrate, the length of each of the first circuit body 20A and the second circuit body 20B is shortened in the stacking direction (front-back direction). Therefore, no dedicated large-scale mounting device is required when attaching (i.e., mounting) the electronic component 50 to the branch line portion 22.In other words, even if a length and a size of a final main line obtained by connecting the first circuit body 20A and the second circuit body 20B are not suitable for a general (universal) mounting jig, the first circuit body 20A and the second circuit body 20B can be connected to each other after the electronic component 50 is appropriately mounted on the branch line portion 22 using the general (universal) mounting jig for each of the first circuit body 20A and the second circuit body 20B. Therefore, the manufacturing cost of the bus bar module 10 can be reduced.

[0045] According to the bus bar module 10 of the present embodiment, since the first circuit body 20A and the second circuit body 20B are manufactured as separate bodies and then electrically connected to each other, when the bus bar module 10 is exposed to water or the like, liquid such as water may enter the overlap portion 23 (between the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body) of the main line portion 21 of the first circuit body 20A and the main line portion 21 of the second circuit body.However, by providing the slit-shaped insulating hole portion 32 between adjacent connection points in which the contact portion 25 of the first circuit body 20A and the contact portion 25 of the second circuit body are connected, it is possible to prevent the occurrence of a problem in which the adjacent connection points become conductive (short-circuited) by the liquid.

[0046] According to the bus bar module 10 of the present embodiment, by aligning the hole portion 31 of the first circuit body 20A and the hole portion 31 of the second circuit body 20B so that they overlap each other (for example, by inserting the protrusion 61a as in this example or a rod-shaped fixture into the hole portion 31 of the first circuit body 20A and the hole portion 31 of the second circuit body 20B), it is possible to prevent the positional deviation or the like between the wiring pattern 26 of the first circuit body 20A and the wiring pattern 26 of the second circuit body 20B when both wiring patterns 26 are electrically connected to each other (for example, soldered). Accordingly, the reliability of the electrical connection between the first circuit body 20A and the second circuit body 20B can be improved.In addition, since the hole portion 31 and the insulation hole portion 32 communicate with each other, the diameter of the insulation hole portion 32 is increased and the above-described short circuit prevention effect can be further improved.

[0047] According to the bus bar module 10 of the present embodiment, the holder 60 includes the protrusion 61a, which is inserted into the portion 31 of the first circuit body 20A and the portion 31 of the second circuit body 20B. Accordingly, it is possible to jointly perform the operation of accommodating the first circuit body 20A and the second circuit body 20B in the holder 60 and the operation of electrically connecting the wiring pattern 26 of the first circuit body 20A and the wiring pattern 26 of the second circuit body 20B to each other while regulating the positions of both wiring patterns 26 by the protrusion 61a. When an unintentional external force is applied to the main lines (the first circuit body 20A and the second circuit body 20B) after the connection, the external force is absorbed by the protrusion 61a.Therefore, it is possible to prevent the external force from being applied to the circuit connection portion of the circuit pattern 26 of the first circuit body 20A and the circuit pattern 26 of the second circuit body 20B. Accordingly, the reliability of the electrical connection between the first circuit body 20A and the second circuit body 20B can be improved.

[0048] According to the bus bar module 10 of the present embodiment, the circuit pattern 26 of the first circuit body 20A and the circuit pattern 26 of the second circuit body 20B are conductively connected to each other by a conductive bonding material. Accordingly, in addition to electrically connecting the wiring pattern 26 of the first circuit body 20A and the wiring pattern 26 of the second circuit body 20B, the first circuit body 20A and the second circuit body 20B are also mechanically integrated.

[0049] According to the bus bar module 10 of the present embodiment, in addition to connecting the circuit pattern 26 of the first circuit body 20A and the circuit pattern 26 of the second circuit body 20B, the dummy contact portion 27 of the first circuit body 20A and the dummy contact portion 27 of the second circuit body 20B are connected to each other. Accordingly, the first circuit body 20A and the second circuit body 20B can be more tightly integrated.

[0050] The present invention has been described based on the above-described embodiment, however, the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like can be made as appropriate. In addition, the materials, shapes, sizes, numbers, arrangement positions, or the like of components in the above-described embodiment are arbitrary and not limited as long as the present invention can be implemented. <Erste Modifikation>

[0051] In the above-described embodiment, the plurality of hole portions 31 are formed in the first circuit body 20A and the second circuit body 20B, respectively. The bracket 60 is provided with projections 61a that are inserted into the plurality of hole portions 31.

[0052] In contrast, as in the Fig. 6 to 8, the portion with holes 31 may not be formed in each of the first circuit body 20A and the second circuit body 20B. In this case, the projections 61a are formed in a rib shape to correspond to the insulation hole portion 32, and the projections 61a are respectively inserted into the two insulation hole portions 32 at a front end and a rear end among the five insulation hole portions 32. That is, first, in a state where the circuit connecting portion 23 of the first circuit body 20A is arranged below the circuit connecting portion 23 of the second circuit body 20B, the plurality of projections 61a are inserted from below into the plurality of insulation hole portions 32 of the first circuit body 20A and the plurality of insulation hole portions 32 of the second circuit body 20B in this order (see Fig. 7).

[0053] Accordingly, it is possible to combine the operation of accommodating the first circuit body 20A and the second circuit body 20B in the holder 60 and the operation of electrically connecting the wiring 26 of the first circuit body 20A and the wiring pattern 26 of the second circuit body 20B while regulating the positions of both wiring patterns 26 by the protrusion 61a. When an inadvertent external force is applied to the main wires (the first circuit body 20A and the second circuit body 20B) after connection, the external force is absorbed by the protrusion 61a. Therefore, it is possible to prevent the external force from being applied to the circuit connection portion of the circuit pattern 26 of the first circuit body 20A and the circuit pattern 26 of the second circuit body 20B.Accordingly, the reliability of the electrical connection between the first circuit body 20A and the second circuit body 20B can be improved.

[0054] Here, the features of the above-described embodiment of the busbar module according to the present invention are briefly summarized and listed in the following first to fourth aspects.

[0055] According to a first aspect of the present invention, a busbar module (10) to be attached to a battery assembly (1) in which a plurality of individual cells (2) are stacked comprises a first circuit body (20A) formed of a flexible substrate having a first wiring pattern (26) and comprising a first main line portion (21) and a first branch line portion (22), wherein the first main line portion (21) is arranged to extend along a stacking direction of the plurality of individual cells (2), and wherein the first branch line portion (22) extends to branch from the first main line portion (21); a second circuit body (20B) formed of a flexible substrate having a second wiring pattern (26) and comprising a second main line portion (21) and a second branch line portion (22), wherein the second main line portion (21) is arranged to extend along the stacking direction and the second branch line portion (22) extends to branch from the second main line portion (21); a busbar (40) configured to connect adjacent electrodes (4, 5) between the plurality of individual cells (2); an electronic component (50) attached to each of the first branch line section (22) and the second branch line section (22) to connect each of the first wiring pattern (26) and the second wiring pattern (26) to the corresponding bus bar (40); and a holder (60) which is expandable and contractible along the stacking direction and holds the first circuit body (20A), the second circuit body (20B) and the busbar (40), wherein the first circuit pattern (26) comprises a plurality of first contact portions (25) arranged in the stacking direction, the second wiring pattern (26) comprises a plurality of second contact portions (25) arranged in the stacking direction, the plurality of first contact sections (25) and the plurality of second contact sections (25) are electrically connected to one another at an overlap section (23) of the first main line section (21) and the second main line section (21), and the first circuit body (20A) and the second circuit body (20B) each have a slit-shaped insulation hole portion (32) between adjacent connection points among a plurality of connection points at which the first contact portions (25) and the second contact portions (25) are in contact, the insulation hole portion (32) penetrating the overlap portion (23) in a thickness direction.

[0056] According to the bus bar module having the configuration of the above first aspect, the first circuit body and the second circuit body (hereinafter also referred to as "main lines") formed of the flexible substrates are integrated by electrically connecting the first contact portion of the first circuit pattern and the second contact portion of the second circuit pattern at the overlapping portion of the first main line portion of the first circuit body and the second main line portion of the second circuit body. In other words, the first circuit body and the second circuit body are electrically connected to each other. The first branch line portion and the second branch line portion (hereinafter also referred to as "branch lines") extend to branch from the first main line portion and the second main line portion, respectively.Therefore, when the battery assembly expands and contracts in the stacking direction due to thermal deformation of each cell, each of the bus bars can move by bending or the like of the branch lead. Likewise, by bending or the like of the branch lead, the change in the size of the battery assembly in the stacking direction due to the assembly tolerance of the individual cells can be absorbed. In other words, the bus bar module with the present configuration can easily cope with the expansion and contraction and manufacturing deviation of the battery assembly caused by the deformation of the branch lead. Here, the flexible substrate, even if it contains a large number of circuits, is generally easily and flexibly deformed with a much smaller force than an electric wire used in the bus bar module in the related art described above.Therefore, the mountability to the battery assembly is improved. Accordingly, the busbar module with the present configuration is better suited for mounting to the battery assembly and adapting to the deformation and manufacturing variations of the battery assembly than the busbar module in the related art described above.

[0057] According to the bus bar module having the above configuration, among the plurality of first contact portions arranged in the stacking direction of the plurality of single cells, a first wiring portion extends from a first contact portion to one side in one direction, and a first wiring portion extends from another first contact portion to the other side in a direction intersecting the above direction. Accordingly, by arranging the plurality of first wiring portions extending from the plurality of first contact portions in a divided manner in the directions that cross each other, it is possible to contribute to an improvement in the degree of freedom of a pattern design of the first wiring portions, a miniaturization of the first circuit body, and the like. The same can be applied to the second circuit pattern of the second circuit body.In addition, the first circuit body and the second circuit body are prepared as separate bodies and then electrically connected to each other. Therefore, if the first circuit body and the second circuit body are formed from a single continuous flexible substrate, a length of each of the first circuit body and the second circuit body is shortened in the stacking direction. Therefore, no dedicated large-scale mounting device is required when attaching (i.e., mounting) the electronic components to the first branch line portion and the second branch line portion.In other words, even if the length and size of the final main line obtained by connecting the first circuit body and the second circuit body are not suitable for a general (universal) mounting jig, the first circuit body and the second circuit body can be connected to each other after the electronic component is appropriately mounted on the branch line circuit body, using the general (universal) mounting jig for each of the first circuit body and the second circuit body. Therefore, the manufacturing cost of the busbar module can be reduced.

[0058] According to the bus bar module having the above configuration, since the first circuit body and the second circuit body are prepared as separate bodies and then electrically connected to each other, when the bus bar module is exposed to water or the like, liquid such as water may enter the overlap portion of the first main line portion of the first circuit body and the second main line portion of the second circuit body (between the first main line portion and the second main line portion). However, by providing the slit-shaped insulation hole portion between the adjacent connection points in which the first contact portion and the second contact portion are respectively connected, it is possible to prevent the occurrence of a problem in which the adjacent connection points become conductive (short-circuited) by the liquid.

[0059] According to a second aspect of the present invention, the busbar module (10) according to the above first aspect the first circuit body (20A) has a first hole portion (31) penetrating the first circuit body (20A) in the thickness direction, the second circuit body (20B) has a second hole portion (31) penetrating the second circuit body (20B) in the thickness direction, wherein the first contact portions (25) and the second contact portions (25) are electrically connected in a state in which the first hole portion (31) and the second hole portion (31) are aligned so as to overlap each other, and the first hole portion (31) and the second hole portion (31) are connected to the insulation hole portion (32).

[0060] According to the bus bar module having the configuration of the above second aspect, by aligning the first hole portion of the first circuit body and the second hole portion of the second circuit body so that they overlap each other (for example, by inserting the rod-shaped fixture into the first hole portion and the second hole portion), it is possible to prevent a positional deviation or the like between the first wiring pattern and the second wiring pattern when both wiring patterns are electrically connected (for example, soldered). Since at least one of the first hole and the second hole portion communicates with the insulation hole portion, the diameter of the insulation hole portion is increased, and the short circuit prevention effect described above can be further enhanced. The communicating hole portion can be used for alignment.

[0061] According to a third aspect of the present invention, the busbar module (10) according to the above-mentioned second aspect comprises the bracket (60) has a projection (61a) which is inserted into the first hole portion (31) and the second hole portion (31).

[0062] According to the bus bar module having the configuration of the above third aspect, the holder includes the protrusion inserted into the first hole portion of the first circuit body and the second hole portion of the second circuit body. Accordingly, it is possible to perform an operation for collectively accommodating the first circuit body and the second circuit body in the holder and an operation for electrically connecting the wiring pattern of the first circuit body and the wiring pattern of the second circuit body to each other while regulating the positions of both wiring patterns by the protrusion. When an unintentional external force is applied to the main lines (the first circuit body and the second circuit body) after the connection, the external force is absorbed by the protrusion.Therefore, it is possible to prevent external force from being applied to the circuit connection portion of the circuit pattern of the first circuit body and the circuit pattern of the second circuit body. Accordingly, the reliability of the electrical connection between the first circuit body and the second circuit body can be improved.

[0063] According to a fourth aspect of the present invention, the holder in the busbar module (10) according to the above first to third aspects comprises a projection inserted into the insulation hole portion.

[0064] According to the busbar module having the configuration of the above fourth aspect, the holder includes the protrusion inserted into the insulation hole portion. Accordingly, it is possible to jointly perform the operation of accommodating the first circuit body and the second circuit body in the holder and the operation of electrically connecting the wiring pattern of the first circuit body and the wiring pattern of the second circuit body to each other while regulating the positions of both wiring patterns by the protrusion. When an unintentional external force is applied to the main lines (the first circuit body and the second circuit body) after the connection, the external force is absorbed by the protrusion.Therefore, it is possible to prevent external force from being applied to the circuit connection portion of the circuit pattern of the first circuit body and the circuit pattern of the second circuit body. Accordingly, the reliability of the electrical connection between the first circuit body and the second circuit body can be improved.

[0065] Although the present invention has been described in detail with reference to the specific embodiments, it will be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

[0066] This application is based on a Japanese patent application (Japanese Patent Application No. 2022-192292) filed on November 30, 2022, the contents of which are incorporated herein by reference. INDUSTRIAL APPLICABILITY

[0067] According to the present invention, it is possible to provide the bus bar module with excellent mountability to a battery assembly and adaptability to deformation and manufacturing variation of the battery assembly. The present invention, which has this effect, is useful for the bus bar module. LIST OF REFERENCE SYMBOLS 1 Battery arrangement 2 single cells 4 positive electrode (electrode) 5 negative electrode (electrode) 10 busbar module 20A first circuit body 20B second circuit body 21 main line section (first main line section, second main line section) 22 branch line section (first branch line section, second branch line section) 23 Circuit connection section (overlap section) 25 contact section (first contact section, second contact section) 26 wiring patterns (first wiring pattern, second wiring pattern) 31 hole section (first hole section, second hole section) 32 Insulation hole section 40 busbar 50 electronic components 60 bracket 61a projection QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2014-220 128 A

[0004] JP 2022-192292

[0066]

Claims

[1] A busbar module to be attached to a battery assembly in which a plurality of individual cells are stacked, the busbar module comprising: a first circuit body formed of a flexible substrate having a first wiring pattern and comprising a first main line portion and a first branch line portion, the first main line portion being arranged to extend along a stacking direction of the plurality of individual cells, and the first branch line portion extending to branch from the first main line portion; a second circuit body formed of a flexible substrate having a second wiring pattern and comprising a second main line portion and a second branch line portion, the second main line portion being arranged to extend along the stacking direction, and the second branch line portion extending to branch from the second main line portion; a busbar configured to connect to adjacent electrodes between the plurality of individual cells; an electronic component attached to each of the first branch line section and the second branch line section to connect each of the first wiring pattern and the second wiring pattern to the corresponding bus bar; and a holder expandable and contractible along the stacking direction and holding the first circuit body, the second circuit body and the bus bar, wherein the first circuit pattern comprises a plurality of first contact portions arranged in the stacking direction, the second circuit pattern comprises a plurality of second contact portions arranged in the stacking direction, the plurality of first contact portions and the plurality of second contact portions are electrically connected to each other at an overlap portion of the first main line portion and the second main line portion, and the first circuit body and the second circuit body each have a slit-shaped insulating hole portion between adjacent connecting portions among a plurality of connecting portions at which the first contact portions and the second contact portions are in contact, the insulating hole portion penetrating the overlapping portion in a thickness direction. [2] Busbar module according to claim 1, wherein the first circuit body has a first hole portion penetrating the first circuit body in the thickness direction, the second circuit body has a second hole portion penetrating the second circuit body in the thickness direction, the first contact portions and the second contact portions are electrically connected in a state in which the first hole portion and the second hole portion are aligned to overlap each other, and the first hole section and the second hole section are connected to the insulation hole section. [3] The bus bar module according to claim 2, wherein the bracket comprises a projection inserted into the first hole portion and the second hole portion. [4] The busbar module according to any one of claims 1 to 3, wherein the bracket includes a projection inserted into the insulation hole portion.

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