Laminated circuit body and bus bar module

Abstract

The laminated circuit body (20) includes: a first circuit body (20A) formed of a flexible substrate having a first wiring pattern; and a second circuit body (20B) formed from a flexible substrate having a second wiring pattern and laminated on the first circuit body (20A). In a laminated portion of the first circuit body (20A) and the second circuit body (20B), an input conductive line (24) and an output conductive line (23) included in the first wiring pattern are electrically conductively connected to each other via a relay conductive line (25) included in the second wiring pattern.

Description

Technical Field

[0001] The present invention relates to a laminated circuit body and a bus bar module using the laminated circuit body. Background Art

[0002] In the related art, the bus bar module is used, for example, to be assembled into a battery assembly (i.e., a battery module in which a plurality of battery cells are stacked and arranged) used as a driving power source mounted on an electric vehicle, a hybrid vehicle, etc. (eg, see Patent Documents 1 to 3).

[0003] As an example, the bus bar module described in Patent Document 1 includes a plurality of bus bars and a voltage detection line. The bus bars are stacked, and each bus bar connects the positive and negative electrodes between adjacent battery cells. The voltage detection lines are respectively connected to the plurality of bus bars and monitor the battery cells. The voltage detection lines are configured to bundle a plurality of wires. Each wire has a general structure in which a core wire is covered by an insulating sheath.

[0004] Reference List

[0005] Patent Literature

[0006] Patent Document 1: JP2014-220128A

[0007] Patent Document 2: JP2020-087666A

[0008] Patent Document 3: JP2007-123394A Summary of the invention

[0009] Technical issues

[0010] Typically, the battery cells constituting the battery assembly expand and contract in the stacking direction due to operational heat associated with charging and discharging, the temperature of the external environment, and the like. Therefore, the battery assembly (battery module) is also deformed to expand and contract in the stacking direction of the battery cells. In addition, when a plurality of battery cells are stacked and arranged, the dimensions of the battery assembly in the stacking direction will typically vary for manufactured battery assemblies due to assembly tolerances (i.e., manufacturing differences may occur). Therefore, the bus bar module is typically designed to have a certain margin in the length of the voltage detection line in order to cope with such deformation and manufacturing differences of the battery assembly.

[0011] However, in the bus bar module in the above-mentioned related art, for example, when the number of stacked battery cells is increased in order to increase the capacity of the battery assembly, the number of wires constituting the voltage detection line also increases. Therefore, when the voltage detection line is formed by bundling these wires, the rigidity of the voltage detection line as a whole (and thus the rigidity of the bus bar module) increases, and it may be difficult to improve the operability (assemblyability) of assembling the bus bar module to the battery assembly. For the same reason, the bus bar module may also be difficult to extend and contract to fully cope with the deformation and manufacturing differences of the battery assembly.

[0012] An object of the present invention is to provide a bus bar module excellent in assemblability to a battery assembly and adaptability to deformation and manufacturing variations of the battery assembly, and a laminated circuit body for the bus bar module.

[0013] Solution to the problem

[0014] According to one aspect of the present invention, there is provided a stacked circuit body, which is configured to be electrically connected between an input terminal and an output terminal. The stacked circuit body comprises:

[0015] a first circuit body formed of a flexible substrate having a first wiring pattern; and

[0016] A second circuit body is formed of a flexible substrate having a second wiring pattern and is stacked on the first circuit body, wherein

[0017] The first wiring pattern includes an input conductive line configured to be connected to an input terminal and an output conductive line configured to be connected to an output terminal,

[0018] The second wiring pattern includes a relay conductor, and

[0019] In the laminated portion of the first circuit body and the second circuit body, each input wire and each output wire of the first wiring pattern are conductively connected via each relay wire of the second wiring pattern.

[0020] According to another aspect of the present invention, there is provided a bus bar module to be attached to a battery assembly in which a plurality of single cells are stacked. The bus bar module comprises:

[0021] The above-mentioned laminated circuit body;

[0022] a bus bar provided as an input terminal and connected to the input wire of the first wiring pattern, the bus bar being configured to be connected to adjacent electrodes between the plurality of single cells; and

[0023] A connector accommodating an output terminal configured to be connected to an output conductor of a first wiring pattern, wherein

[0024] The arrangement order of the output wires in the width direction of the laminated circuit body matches the order of magnitude of the potentials of the electrodes connected via the output wires, the relay wires, the input wires, and the bus bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view showing a state in which a first circuit body and a second circuit body included in a stacked circuit body used in a bus bar module according to an embodiment are separated from each other;

[0026] Figure 2 is a perspective view showing a bus bar module according to the present embodiment;

[0027] Figure 3 It shows Figure 2 a perspective view of a battery assembly into which the bus bar module is to be assembled; and

[0028] Figure 4 yes Figure 2 A top view of a busbar module is shown. DETAILED DESCRIPTION

[0029] Hereinafter, a bus bar module 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings. The bus bar module 10 according to the present embodiment is used, for example, to be assembled to a long battery assembly 1 (a battery module in which a plurality of single cells are stacked and arranged, see Figure 3 ).

[0030] In the following, for the convenience of description, “front”, “rear”, “left”, “right”, “upper” and “lower” are defined as follows: Figure 1 The “front-rear direction”, “left-right direction” and “up-down direction” are orthogonal to each other. The front-rear direction is the stacking direction of the plurality of cells 2 included in the battery assembly 1 (see FIG. Figure 3 These directions are defined for convenience of description and do not necessarily correspond to the front-rear direction, left-right direction, and up-down direction of the vehicle when the bus bar module 10 is mounted on the vehicle.

[0031] First, as a preparation for describing the bus bar module 10, reference will be made to Figure 3 The battery assembly 1 to which the bus bar module 10 is to be attached is described. Figure 3 As shown, the battery assembly 1 is formed by stacking a plurality of rectangular flat-plate-shaped cells 2 in the front-to-rear direction, each of which extends in the up-down direction and the left-right direction. Each of the plurality of cells 2 includes a battery body 3 having a rectangular flat plate shape, and a positive electrode 4 and a negative electrode 5 protruding upward from both ends in the left-right direction of the upper surface 6 of the battery body 3.

[0032] In the battery assembly 1, by making the positions of the positive electrode 4 and the negative electrode 5 of a single cell 2 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 another single cell 2 in the left-to-right direction, a plurality of single cells 2 are stacked so that the positive electrode 4 and the negative electrode 5 are alternately arranged in the front-to-back direction at each of the left end portion and the right end portion of the upper surface of the battery assembly 1.

[0033] Hereinafter, the bus bar module 10 will be described. Figure 1 , 2 As shown in FIG. 4 , the bus bar module 10 includes a long laminated circuit body 20 extending in the front-to-back direction, a plurality of bus bars 30 connected to a plurality of branch line portions 22 of the laminated circuit body 20, and a connector 40 connected to the rear end portion of the laminated circuit body 20 (see FIG. Figure 2 ) The main line portion 21 and the branch line portion 22 of the laminated circuit body 20 are also referred to as a “main line” and a “branch line”, respectively.

[0034] The laminated circuit body 20 is formed by laminating a first circuit body 20A and a second circuit body 20B, both of which are formed of an easily bendable flexible substrate (FPC). Therefore, the laminated circuit body 20 (the first circuit body 20A and the second circuit body 20B) is also easily bendable.

[0035] like Figure 1 As shown, the first circuit body 20A includes a strip-shaped main line portion 21 extending in the front-to-back direction and a plurality of branch line portions 22 extending to branch outward in the left-to-right direction from a plurality of positions in the front-to-back direction of the main line portion 21. The connector 40 is connected to the rear end portion of the main line portion 21 of the first circuit body 20A. The first circuit body 20A has a surface formed of a resin layer except for a portion where the contact portions p, q described later are exposed (see Figure 1 ), and includes a "first wiring pattern". The first circuit body 20A is a so-called "single-sided flexible substrate (single-sided FPC)" having a single wiring layer, and the "first wiring pattern" is arranged on the single wiring layer. The details of the "first wiring pattern" will be described later.

[0036] The second circuit body 20B has a strip shape extending in the front-rear direction corresponding to the main line portion 21 of the first circuit body 20A, and is laminated on the upper surface of the first circuit body 20A except for the area near the front end of the main line portion 21 (see FIG. Figure 2 and Figure 4 The second circuit body 20B has a surface formed of a resin layer except for a portion where the contact portions r, s described later are exposed (see Figure 1), and includes a "second wiring pattern". The second circuit body 20B is a so-called "single-sided flexible substrate (single-sided FPC)" having a single wiring layer, and the "second wiring pattern" is arranged on the single wiring layer. The details of the "second wiring pattern" will be described later.

[0037] The metal bus bars 30 are connected to the distal end portions of the branch line portions 22 of the first circuit body 20A, respectively. Therefore, on each of the left and right sides of the main line portion 21, a plurality of bus bars 30 are arranged side by side in a manner spaced apart in the front-rear direction (see FIG. Figure 1 ). Each bus bar 30 has a substantially rectangular flat plate shape extending in the front-to-rear direction, and has a pair of front-to-rear through holes 31. The interval between the pair of front-to-rear through holes 31 in the front-to-rear direction is equal to the interval between the positive electrode 4 and the negative electrode 5 adjacent in the front-to-rear direction in the battery assembly 1 in the front-to-rear direction.

[0038] Hereinafter, details of the “first wiring pattern” included in the first circuit body 20A and the “second wiring pattern” included in the second circuit body 20B, and a process for laminating the second circuit body 20B on the first circuit body 20A will be described. For ease of description, as shown in FIG. Figure 4 As shown, a plurality of (specifically, nine) bus bars 30 and a plurality of (nine) reference numerals A, B, C, D, E, F, G, H, and I are associated in a one-to-one correspondence. On the right side of the main line portion 21, five bus bars 30 corresponding to reference numerals A, C, E, G, and I are arranged in the front-to-rear direction. On the left side of the main line portion 21, four bus bars 30 corresponding to reference numerals B, D, F, and H are arranged in the front-to-rear direction.

[0039] like Figure 1 As shown in the figures, in the first circuit body 20A, as a "first wiring pattern", the output wire 23 and the input wire 24 are arranged in a single wiring layer corresponding to nine bus bars 30 corresponding to reference numerals A to I (all bus bars 30 arranged on the left and right sides). In the second circuit body 20B, as a "second wiring pattern", the relay wire 25 is arranged on a single wiring layer corresponding to four bus bars 30 corresponding to reference numerals C, E, G, and I (four bus bars 30 except the frontmost bus bar 30 among the five bus bars 30 arranged on the right side). Each of the output wire 23, the input wire 24, and the relay wire 25 is a copper conductor extending in a strip shape.

[0040] In the first circuit body 20A, nine output conductors 23 corresponding to the bus bars 30 indicated by reference numerals A to I are arranged from right to left in the order of reference numerals A to I in the left-right direction, and extend from the rear end of the main line portion 21 to the front side along the main line portion 21 in the front-rear direction (see Figure 4). The position of the front end of each of the nine output wires 23 corresponding to the busbars 30 indicated by reference numerals A to I in the front-rear direction matches the position of the base of the corresponding one branch line portion 22 in the front-rear direction. The rear end portions of the nine output wires 23 are independently connected to a plurality of (nine) output terminals (not shown) in a one-to-one correspondence. The output terminals are accommodated in a connector 40 (see FIG. 1 ) connected to the rear end portion of the main line portion 21. Figure 2 )middle.

[0041] In the first circuit body 20A, nine input conductors 24 corresponding to the nine bus bars 30 indicated by reference numerals A to I extend along the branch line portions 22 corresponding to the bus bars 30 indicated by reference numerals A to I, respectively. Each of the nine input conductors 24 is connected to a corresponding one of the bus bars 30 at a distal end portion of a corresponding one of the branch line portions 22. The output conductor 23 and the input conductor 24 corresponding to one of the five bus bars 30 indicated by reference numerals A, B, D, F, and H are directly conductively connected in the main line portion 21. Meanwhile, the output conductor 23 and the input conductor 24 corresponding to one of the four bus bars 30 indicated by reference numerals C, E, G, and I are not connected in the main line portion 21, and are conductively connected to each other via a corresponding one of the relay conductors 25 provided in the second circuit body 20B. Ends of the input conductive wires 24 corresponding to the four bus bars 30 denoted by reference characters C, E, G, and I on the side opposite to the bus bars 30 are located near the base of a corresponding one of the branch line portions 22 in the main line portion 21 .

[0042] Therefore, each of the five bus bars 30 corresponding to the reference numerals A, B, D, F and H is conductively connected to a corresponding output terminal in the connector 40 in sequence through a corresponding input conductor 24 and a corresponding output conductor 23. Each of the four bus bars 30 corresponding to the reference numerals C, E, G and I is conductively connected to a corresponding output terminal in the connector 40 in sequence through a corresponding input conductor 24, a corresponding relay conductor 25 and a corresponding output conductor 23. The connector 40 is connected to an external voltage detection device (not shown). Therefore, each of the nine bus bars 30 corresponding to the reference numerals A to I is individually and conductively connected to an external voltage detection device via the connector 40. The details of the "first wiring pattern" included in the first circuit body 20A and the "second wiring pattern" included in the second circuit body 20B have been described above.

[0043] Next, a process for laminating the second circuit body 20B on the first circuit body 20A will be described. Figure 1As shown, on the upper surface of the first circuit body 20A, the metal contact portions p respectively conductively connected to the ends of the four input wires 24 are respectively provided to be exposed at positions just above the ends, and the ends of the four input wires 24 correspond to the four bus bars 30 represented by the reference numerals C, E, G, and I. The metal contact portions q respectively conductively connected to the front ends of the four output wires 23 are respectively provided to be exposed at positions just above the ends, and the four output wires 23 correspond to the four bus bars 30 represented by the reference numerals C, E, G, and I. On the lower surface of the second circuit body 20B, the metal contact portions r respectively conductively connected to the right ends of the four relay wires 25 are respectively provided to be exposed at positions just below the right ends corresponding to the four contact portions p provided in the first circuit body 20A, and the four relay wires 25 extend in the left-right direction and correspond to the four bus bars 30 represented by the reference numerals C, E, G, and I. The metal contact portions s respectively and conductively connected to the left ends of the four relay conductors 25 are arranged to be exposed at a position directly below the left ends corresponding to the four contact portions q arranged in the first circuit body 20A, and the four relay conductors 25 extend in the left-right direction and correspond to the four relay conductors 25 of the four bus bars 30 represented by the figure marks C, E, G and I.

[0044] When the second circuit body 20B is stacked on the upper surface of the first circuit body 20A, first, the second circuit body 20B is placed on the upper surface of the main line portion 21 of the first circuit body 20A, so that the contact portions p and r corresponding to each other are arranged to face each other in the up-down direction, and the contact portions q and s corresponding to each other are arranged to face each other in the up-down direction. Next, the contact portions p and r corresponding to each other are welded independently of each other in a one-to-one manner, and the contact portions q and s corresponding to each other are welded independently of each other in a one-to-one manner. Typically, welding can be performed by the following method (so-called pulse heating method): paste solder is sandwiched between the contact portions p and r arranged to face each other in the up-down direction and between the contact portions q and s arranged to face each other in the up-down direction, and then the heater chip is pressed against the part to be welded, the heater chip can heat the solder to a temperature at which the solder can melt, and perform welding. Welding can be performed by a reflow soldering method using a heating furnace. The electrical connection between the contact portions p and r corresponding to each other and the electrical connection between the contact portions q and s corresponding to each other can be performed using a conductive adhesive instead of the above-mentioned welding.

[0045] As described above, the second circuit body 20B is stacked on the upper surface of the first circuit body 20A in a state in which the output wire 23 and the input wire 24 provided in the first circuit body 20A corresponding to one of the four bus bars 30 denoted by reference numerals C, E, G, and I are conductively connected to each other via the corresponding relay wire 25 provided in the second circuit body 20B. The process of stacking the second circuit body 20B on the first circuit body 20A has been described above.

[0046] Above Figure 2 and Figure 4 The bus bar module 10 shown in FIG. 1 is assembled to the upper surface of the battery assembly 1 via a resin holder (not shown) so that “the corresponding positive electrode 4 and the corresponding negative electrode 5 adjacent to each other in the front-rear direction” are inserted into a pair of through holes 31 of the bus bar 30. The holder holds the laminated circuit body 20 and the plurality of bus bars 30.

[0047] In the state where the bus bar module 10 is assembled to the battery assembly 1, the bus bar 30 conductively connects "the corresponding positive electrodes 4 and the corresponding negative electrodes 5 adjacent to each other in the front-to-back direction", so that the plurality of cells 2 constituting the battery assembly 1 are electrically connected in series via the plurality of bus bars 30. Therefore, the potentials of the nine bus bars 30 corresponding to the reference numerals A to I become higher in the order of the reference numerals A to I. As described above, in the first circuit body 20A, the nine output conductors 23 corresponding to the bus bars 30 represented by the reference numerals A to I are arranged from right to left in the order of the reference numerals A to I (see Figure 4 ). As described above, in the laminated circuit body 20, the arrangement order of the nine output wires 23 arranged in the first circuit body 20A is replaced by the relay wire 25 arranged in the second circuit body 20B with the potential order of the bus bar 30 connected to the input wire 24 arranged in the first circuit body 20A. Therefore, compared with the case where a plurality of wiring patterns are provided in a multilayer shape in a single circuit body and such replacement is performed, the manufacturing process of the laminated circuit body 20 is less complicated, and thus the manufacturing cost can be reduced.

[0048] In the use state of the battery assembly 1 to which the bus bar module 10 has been attached, each single cell 2 constituting the battery assembly 1 may expand or contract in the stacking direction (front-to-back direction) due to operational heat associated with charging and discharging, the temperature of the external environment, etc. Therefore, the battery assembly 1 is also deformed to expand and contract in the stacking direction (front-to-back direction). In addition, when a plurality of single cells 2 are stacked and arranged, due to assembly tolerances, for a manufactured battery assembly 1, the size of the battery assembly 1 in the stacking direction (front-to-back direction) may vary (manufacturing differences may occur).

[0049] In this regard, in the bus bar module 10, even when expansion and contraction of the battery assembly 1 in the stacking direction (front-to-back direction) occurs due to thermal deformation of each single cell 2 and manufacturing differences of the battery assembly 1, since each branch line portion 22 formed by the flexible substrate is easy to bend, the expansion and contraction caused by the thermal deformation and manufacturing differences of the battery assembly 1 can be easily absorbed.

[0050] 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 formed by the flexible substrate are integrated by electrically connecting the first wiring pattern (output wire 23 and input wire 24) to the second wiring pattern (relay wire 25) at the laminated portion of the first circuit body 20A and the second circuit body 20B. In other words, the input terminal (bus bar 30) and the output terminal (output terminal in the connector 40) are electrically connected to each other via the input wire 24, the relay wire 25, and the output wire 23 included in the laminated circuit body 20. Therefore, for example, in the case where the bus bar 30 serving as the input terminal and the output terminal in the connector 40 serving as the output terminal are electrically connected to each other through the laminated circuit body 20, when the battery assembly 1 expands and contracts in the stacking direction due to the thermal deformation of each single cell 2, each bus bar 30 can be moved in the stacking direction of the single cell 2 by bending of the laminated circuit body 20, etc. Similarly, by bending of the laminated circuit body 20, etc., the dimensional change of the battery assembly 1 in the stacking direction due to the assembly tolerance of the single cell 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 of the battery assembly 1 and manufacturing differences. Here, in general, even when the flexible substrate includes a large number of circuit structures, the flexible substrate can be easily and flexibly deformed with a much smaller force than the wires used in the bus bar module in the above-mentioned related art. Therefore, the assemblability of the battery assembly 1 is improved. Therefore, compared with the bus bar module in the above-mentioned related art, the bus bar module 10 according to the present embodiment is more excellent in the assemblability of the battery assembly 1 and the adaptability to the deformation and manufacturing differences of the battery assembly 1.

[0051] According to the bus bar module 10 of the present embodiment, the arrangement order of the output wires 23 included in the first wiring pattern in the first circuit body 20A can be replaced by the relay wires 25 included in the second wiring pattern in any order (for example, replaced with the potential order of the bus bars 30, the input wires 24 included in the first wiring pattern are connected to each bus bar 30). Therefore, compared with the case where a plurality of wiring patterns are provided in a multi-layer shape in a single circuit body and such replacement is performed, the manufacturing process of the bus bar module 10 is less complicated, and thus the manufacturing cost can be reduced.

[0052] The first circuit body 20A is a circuit body having a single wiring layer (for example, a single-sided flexible substrate).

[0053] The second circuit body 20B is a circuit body having a single wiring layer (eg, a single-sided flexible substrate). Therefore, as described above, the manufacturing cost of the laminated circuit body 20 can be reduced compared to the case where the first circuit body 20A and the second circuit body 20B are completely formed of a circuit body having multiple wiring layers.

[0054] The present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. can be appropriately made. In addition, the materials, shapes, sizes, quantities, arrangement positions, etc. of the components in the above-described embodiments are freely selected and are not limited as long as the present invention can be implemented.

[0055] Here, in the above-mentioned embodiment of the present invention, a laminated circuit body (20) configured to be electrically connected between an input terminal (30) and an output terminal is provided. The laminated circuit body (20) includes:

[0056] a first circuit body (20A) formed of a flexible substrate having a first wiring pattern; and

[0057] The second circuit body (20B) is formed of a flexible substrate having a second wiring pattern and is stacked on the first circuit body, wherein

[0058] The first wiring pattern includes an input conductor (24) configured to be connected to an input terminal (30) and an output conductor (23) configured to be connected to an output terminal,

[0059] The second wiring pattern includes a relay conductor (25), and

[0060] In a laminated portion of a first circuit body (20A) and a second circuit body (20B), each input wire (24) and each output wire (23) of a first wiring pattern are conductively connected via each relay wire (25) of a second wiring pattern.

[0061] According to the laminated circuit body having the above configuration, the first circuit body and the second circuit body formed by the flexible substrate are integrated by electrically connecting the first wiring pattern and the second wiring pattern in the laminated part of the first circuit body and the second circuit body. In other words, the input terminal and the output terminal are electrically connected to each other via the input wire, the relay wire and the output wire included in the laminated circuit body. Therefore, for example, in the case where the busbar used as the input terminal and the terminal used as the output terminal in the connector provided in the busbar module are electrically connected to each other through the laminated circuit body, when the battery assembly expands and contracts in the stacking direction due to the thermal deformation of each single cell, each busbar can be moved in the stacking direction of the single cell by bending of the laminated circuit body, etc. Similarly, by bending of the laminated circuit body, etc., the dimensional change of the battery assembly in the stacking direction caused by the assembly tolerance of the single cell can be absorbed. In other words, the laminated circuit body having the present configuration can easily cope with the expansion and contraction of the battery assembly and manufacturing differences. Here, in general, even when the flexible substrate includes a large number of circuit structures, the flexible substrate can be easily and flexibly deformed with a much smaller force than the wires used in the busbar module in the above-mentioned related art. Therefore, the assemblability of the battery assembly is improved. Therefore, compared with the electric wire for the bus bar module in the above-mentioned related art, the laminated circuit body according to the present configuration is more excellent in assemblability of the battery assembly and adaptability to deformation and manufacturing deviation of the battery assembly.

[0062] According to the laminated circuit body having the above configuration, for example, the arrangement order of the output wires included in the first wiring pattern in the first circuit body can be replaced by the relay wires included in the second wiring pattern in any order (for example, replaced with the potential order of the input terminals, the input wires included in the first wiring pattern are connected to each input terminal). Therefore, compared with the case where a plurality of wiring patterns are provided in a multilayer shape in a single circuit body and such replacement is performed, the manufacturing process of the laminated circuit body is less complicated, and thus the manufacturing cost can be reduced.

[0063] The first circuit body (20A) may have a single wiring layer, and may be configured such that the first wiring pattern is arranged in the single wiring layer.

[0064] The second circuit body (20B) may have a single wiring layer, and may be configured such that the second wiring pattern is arranged in the single wiring layer.

[0065] According to the stacked circuit body having the above configuration, the first circuit body is a circuit body having a single wiring layer (e.g., a single-sided flexible substrate), and the second circuit body is a circuit body having a single wiring layer (e.g., a single-sided flexible substrate). Therefore, as described above, compared with the case where the first circuit body and the second circuit body are completely formed of a circuit body having a plurality of wiring layers, the manufacturing cost of the stacked circuit body can be reduced.

[0066] Meanwhile, in the above-mentioned embodiment of the present invention, the bus bar module (10) is a bus bar module (10) to be attached to a battery assembly (1) in which a plurality of single cells (2) are stacked, and the bus bar module (10) includes:

[0067] The above-mentioned laminated circuit body (20);

[0068] a bus bar (30) provided as an input terminal and connected to the input wire (24) of the first wiring pattern, the bus bar (30) being configured to be connected to adjacent electrodes (4, 5) between the plurality of single cells (2); and

[0069] A connector (40) accommodating an output terminal configured to be connected to an output conductor (23) of a first wiring pattern, wherein

[0070] The arrangement order of the output wires (23) in the width direction of the stacked circuit body (20) matches the order of the potentials of the electrodes (4, 5) connected via the output wires (23), relay wires (25), input wires (24) and bus bars (30).

[0071] According to the bus bar module having the above configuration, the first circuit body and the second circuit body formed by the flexible substrate are integrated by electrically connecting the first wiring pattern and the second wiring pattern in the laminated part of the first circuit body and the second circuit body. In other words, the input terminal and the output terminal are electrically connected via the input wire, the relay wire and the output wire included in the laminated circuit body. Therefore, for example, in the case where the bus bar used as the input terminal and the terminal used as the output terminal in the connector provided in the bus bar module are electrically connected to each other through the laminated circuit body, when the battery assembly expands and contracts in the stacking direction due to the thermal deformation of each single cell, each bus bar can be moved in the stacking direction of the single cell by bending of the laminated circuit body, etc. Similarly, by bending of the laminated circuit body, etc., the dimensional change of the battery assembly in the stacking direction caused by the assembly tolerance of the single cell can be absorbed. In other words, the bus bar module having the present configuration can easily cope with the expansion and contraction of the battery assembly and manufacturing differences. Here, in general, even when the flexible substrate includes a large number of circuit structures, the flexible substrate can be easily and flexibly deformed with a much smaller force than the wires used in the bus bar module in the above-mentioned related art. Therefore, the assemblability of the battery assembly is improved. Therefore, compared with the bus bar module in the above-mentioned related art, the bus bar module having the present configuration is more excellent in assemblability of the battery assembly and adaptability to deformation and manufacturing differences of the battery assembly.

[0072] According to the bus bar module having the above configuration, for example, the arrangement order of the output wires included in the first wiring pattern in the first circuit body can be replaced by the relay wires included in the second wiring pattern in any order (for example, replaced with the potential order of the input terminals, the input wires included in the first wiring pattern are connected to each input terminal). Therefore, compared with the case where a plurality of wiring patterns are provided in a multilayer shape in a single circuit body and such replacement is performed, the manufacturing process of the bus bar module is less complicated, and thus the manufacturing cost can be reduced.

[0073] This application is based on the Japanese patent application filed on December 5, 2022 (Japanese Patent Application No. 2022-194335), the contents of which are incorporated herein by reference.

[0074] Industrial Applicability

[0075] The laminated circuit body and bus bar module according to the present invention are excellent in the assemblability of the battery assembly and the adaptability to the deformation and manufacturing differences of the battery assembly. The present invention having such an effect can be used, for example, for assembling into a long battery assembly (for example, a battery module in which a plurality of single cells are stacked and arranged) which is used as a driving power source mounted on an electric vehicle.

[0076] Reference Symbols List

[0077] 1: Battery components

[0078] 2: Single battery

[0079] 4: Positive electrode (electrode)

[0080] 5: Negative electrode

[0081] 10: Busbar module

[0082] 20: Laminated circuit body

[0083] 20A: First circuit body

[0084] 20B: Second circuit body

[0085] 23: Output wire

[0086] 24: Input wire

[0087] 25: Relay wire

[0088] 30: Bus bar (input terminal)

[0089] 40: Connector.

Claims

1. A laminated circuit body configured to be electrically connected between an input terminal and an output terminal, the laminated circuit body comprising: A first circuit body formed of a flexible substrate having a first wiring pattern; and A second circuit body is formed of a flexible substrate having a second wiring pattern and is stacked on the first circuit body, wherein The first wiring pattern includes an input conductive line configured to be connected to the input terminal and an output conductive line configured to be connected to the output terminal, The second wiring pattern includes a relay conductor, and In the laminated portion of the first circuit body and the second circuit body, each input wire and each output wire of the first wiring pattern are conductively connected via each relay wire of the second wiring pattern.

2. The laminated circuit body according to claim 1, wherein The first circuit body has a single wiring layer, and is configured such that the first wiring pattern is arranged in the single wiring layer, and The second circuit body has a single wiring layer, and is configured such that the second wiring pattern is arranged in the single wiring layer.

3. A bus bar module, the bus bar module being attached to a battery assembly in which a plurality of single cells are stacked, the bus bar module comprising: The laminated circuit body according to claim 1 or 2; a bus bar provided as an input terminal and connected to the input wire of the first wiring pattern, the bus bar being configured to be connected to adjacent electrodes between the plurality of single cells; and a connector accommodating an output terminal configured to be connected to an output conductor of the first wiring pattern, wherein The arrangement order of the output wires in the width direction of the laminated circuit body matches the order of magnitude of the potentials of the electrodes connected via the output wires, the relay wires, the input wires, and the bus bars.

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