Busbar Module

Abstract

To provide a bus bar module which can reduce a footprint.SOLUTION: A bus bar module 1 comprises a first bus bar group 2A, a second bus bar group 2B, a flexible printed wiring board 3, and a resin case 4. The flexible printed wiring board has a base end part 30 and a main body 31. The flexible printed wiring board has a first slit part 34 and a second slit part 35. The main body is split into two, namely a first region 31A and a second region 31B, by the second slit part. The case has a first case part 4A and a second case part 4B. The first case part 4A is formed such that the first region 31A and a first cover part 42 cover the first bus bar group. The second case part 4B is formed such that the second region 31B and a second cover part 45 cover the second bus bar group.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a bus bar module. [Background technology]

[0002] Conventionally, there are wiring modules for batteries. The wiring module for batteries disclosed in Patent Document 1 has a wiring pattern configured as a path for transmitting signals on one side of a substrate main body, and a guard pattern formed around the wiring pattern on one side of the substrate main body and kept at a predetermined reference potential while being insulated from the wiring pattern. The battery wiring module in Patent Document 1 covers the entire upper surface of the group of single cells. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-18612 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is desirable to reduce the area occupied by a busbar module when viewed in a plan view. If the area occupied by the busbar module is reduced, interference with other components is suppressed, leading to a reduction in the height of the battery pack.

[0005] An object of the present invention is to provide a busbar module that can reduce the occupied area. [Means for solving the problem]

[0006] A bus bar module of the present invention includes a first bus bar group having a plurality of bus bars lined up along a first direction, a second bus bar group having a plurality of bus bars lined up along the first direction and arranged parallel to the first bus bar group, a plurality of first conductors connected to the bus bars of the first bus bar group, and a plurality of second conductors connected to the bus bars of the second bus bar group, and a resin case, wherein the flexible printed wiring board has one end in the first direction, a base end connected to an external device, and a main body extending from the base end to another end in the first direction, and the flexible printed wiring board has a slit that is T-shaped in a plan view, the slit having a first slit portion that is arranged at the base end and extends in a second direction perpendicular to the first direction, and a second slit portion that crosses the main body from the first slit portion along the first direction. the main body is divided by the second slit portion into a first region having the first conductor and a second region having the second conductor; the case has a first case portion and a second case portion, the first case portion having a first accommodating portion that accommodates the first bus bar group, a first cover portion that supports the first region, and a flexible first hinge portion that connects the first accommodating portion and the first cover portion, and is configured such that the first region and the first cover portion cover the first bus bar group by bending the first hinge portion; and the second case portion has a second accommodating portion that accommodates the second bus bar group, a second cover portion that supports the second region, and a flexible second hinge portion that connects the second accommodating portion and the second cover portion, and is configured such that the second region and the second cover portion cover the second bus bar group by bending the second hinge portion. Effect of the Invention

[0007] In the busbar module according to the present invention, the first case portion is configured such that the first region of the flexible printed wiring board and the first cover portion cover the first busbar group when the first hinge portion is bent, and the second case portion is configured such that the second region of the flexible printed wiring board and the second cover portion cover the second busbar group when the second hinge portion is bent. The busbar module according to the present invention has the effect of reducing the occupied area. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a bus bar module and a battery module according to an embodiment. [Diagram 2] FIG. 2 is a plan view of the bus bar module according to the embodiment. [Diagram 3] FIG. 3 is a plan view of the flexible printed wiring board according to the embodiment. [Figure 4] FIG. 4 is a perspective view of the case according to the embodiment. [Diagram 5] FIG. 5 is a perspective view of the bus bar module according to the embodiment. [Figure 6] FIG. 6 is a perspective view of a bus bar module mounted on a battery module. [Figure 7] FIG. 7 is a diagram illustrating the process of folding back the cover portion. [Figure 8] FIG. 8 is a side view of the busbar module assembled to the battery module. [Figure 9] FIG. 9 is a perspective view of a bus bar module assembled to a battery module. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a busbar module according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment. Furthermore, components in the following embodiments include those that can be easily imagined by a person skilled in the art or those that are substantially the same.

[0010] [Embodiment] An embodiment will be described with reference to Fig. 1 to Fig. 9. The embodiment relates to a busbar module. Fig. 1 is a perspective view of a busbar module and a battery module according to an embodiment, Fig. 2 is a plan view of the busbar module according to an embodiment, Fig. 3 is a plan view of a flexible printed wiring board according to an embodiment, Fig. 4 is a perspective view of a case according to an embodiment, Fig. 5 is a perspective view of the busbar module according to an embodiment, Fig. 6 is a perspective view of the busbar module placed on a battery module, Fig. 7 is a diagram for explaining a step of folding back a cover portion, Fig. 8 is a side view of the busbar module assembled to a battery module, and Fig. 9 is a perspective view of the busbar module assembled to a battery module.

[0011] As shown in Fig. 1, a busbar module 1 of this embodiment is assembled to a battery module 110. The busbar module 1 and the battery module 110 constitute a battery pack 100. The battery pack 100 is mounted as a power source in a vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV). The battery pack 100 may include a plurality of busbar modules 1 and a plurality of battery modules 110.

[0012] The battery module 110 has a plurality of battery cells 120. The illustrated battery cells 120 have a rectangular parallelepiped shape. Two electrodes 121 are disposed on a first surface 120a of the battery cell 120. The shape of the first surface 120a is approximately rectangular.

[0013] The battery cells 120 are arranged along a first direction X. More specifically, the battery cells 120 are arranged such that a long side of a first surface 120a faces a long side of another adjacent first surface 120a in the first direction X. In the following description, a direction perpendicular to the first direction X in the first surface 120a is referred to as a "second direction Y". The second direction Y is the longitudinal direction of the first surface 120a. A direction perpendicular to both the first direction X and the second direction Y is referred to as a "third direction Z". The third direction Z is a height direction of the battery cells 120. The first surface 120a is perpendicular to the third direction Z. The battery pack 100 is mounted on a vehicle, for example, such that the first surface 120a faces upward in the vehicle vertical direction.

[0014] The two electrodes 121 on the first surface 120a are arranged side by side in the second direction Y. One of the two electrodes 121 on the first surface 120a is a positive electrode, and the other is a negative electrode. A group of the electrodes 121 arranged at one end in the longitudinal direction of the first surface 120a is referred to as a "first electrode group 121a". A group of the electrodes 121 arranged at the other end in the longitudinal direction of the first surface 120a is referred to as a "second electrode group 121b". In the battery module 110 of this embodiment, the positive electrodes and the negative electrodes are arranged alternately in the first electrode group 121a. In addition, the positive electrodes and the negative electrodes are arranged alternately in the second electrode group 121b. The busbar module 1 of this embodiment connects a plurality of battery cells 120 in series.

[0015] The busbar module 1 of this embodiment has a plurality of busbars 2, a flexible printed wiring board 3, and a case 4. The busbar 2 is formed from a conductive metal plate such as copper or aluminum. As shown in FIG. 2, the busbar 2 has a connection portion 20 and a terminal portion 21. The connection portion 20 is a portion that is connected to a voltage detection line of the flexible printed wiring board 3. The terminal portion 21 is a portion that is connected to an electrode 121 of the battery cell 120. The terminal portion 21 has two through holes into which the electrodes 121 are inserted. The terminal portion 21 is welded to the electrode 121, for example. The terminal portion 21 may be fastened to the electrode 121 by tightening a nut against the electrode 121.

[0016] The bus bar module 1 has a first bus bar group 2A and a second bus bar group 2B. The first bus bar group 2A and the second bus bar group 2B have a plurality of bus bars 2 arranged along a first direction X. The bus bars 2 of the first bus bar group 2A are fixed to the first electrode group 121a of the battery module 110. The bus bars 2 of the second bus bar group 2B are fixed to the second electrode group 121b. The first bus bar group 2A and the second bus bar group 2B are arranged in parallel.

[0017] The flexible printed circuit board 3 is a flexible printed circuit board. The flexible printed circuit board 3 has a resin layer formed of an insulating synthetic resin and a plurality of conductors. The conductor is a conductor layer sandwiched between two resin layers, and is, for example, a metal foil such as a copper foil.

[0018] The flexible printed wiring board 3 of this embodiment has a base end 30 and a main body 31. The base end 30 and the main body 31 are integral. The base end 30 is one end 3a of the flexible printed wiring board 3 in the first direction X. The base end 30 is a portion that is connected to an external device. The external device is typically a monitoring device that monitors the battery pack 100. A connector 32 that is connected to the external device may be disposed on the base end 30.

[0019] The main body 31 extends from the base end 30 to another end 3b in the first direction X of the flexible printed wiring board 3. The flexible printed wiring board 3 has a slit 33 that is T-shaped in a plan view. The slit 33 has a first slit portion 34 and a second slit portion 35. The first slit portion 34 is disposed at the base end 30 and extends in the second direction Y. The illustrated first slit portion 34 extends from the center of the base end 30 toward both sides in the second direction Y.

[0020] The second slit portion 35 traverses the main body 31 from the first slit portion 34 along the first direction X. The illustrated second slit portion 35 is connected to the center 34a of the first slit portion 34. The main body 31 is divided into a first region 31A and a second region 31B by the second slit portion 35. The first region 31A and the second region 31B are rectangular in shape.

[0021] The conductor 5 of the flexible printed wiring board 3 includes a plurality of first conductors 5a and a plurality of second conductors 5b. The conductor 5 is a voltage detection line for detecting the voltage of the battery cell 120. The first conductor 5a is a conductor 5 connected to a bus bar 2 of the first bus bar group 2A. One end of the first conductor 5a is connected to the corresponding bus bar 2 of the first bus bar group 2A. The other end of the first conductor 5a is connected to, for example, a terminal of the connector 32. The first conductor 5a is routed in the first area 31A.

[0022] The second conductor 5b is a conductor 5 connected to the bus bar 2 of the second bus bar group 2B. One end of the second conductor 5b is connected to the corresponding bus bar 2 of the second bus bar group 2B. The other end of the second conductor 5b is connected to, for example, a terminal of the connector 32. The second conductor 5b is routed in the second region 31B.

[0023] FIG. 3 shows a single flexible printed wiring board 3 before being connected to the bus bar 2. The single flexible printed wiring board 3 has a plurality of connecting portions 36 connecting the first region 31A and the second region 31B. The main body 31 is divided into the first region 31A and the second region 31B by cutting the connecting portions 36. The illustrated flexible printed wiring board 3 has three connecting portions 36. The single flexible printed wiring board 3 has three through holes 35a, 35b, and 35c extending in the first direction X. The through holes 35a, 35b, and 35c are located at the boundary between the first region 31A and the second region 31B. By cutting the three connecting portions 36, the through holes 35a, 35b, and 35c are connected to form the second slit portion 35.

[0024] The first region 31A and the second region 31B have a plurality of branch portions 37. The branch portions 37 protrude in the second direction Y. The branch portions 37 of the first region 31A protrude toward the side opposite to the second region 31B. The branch portions 37 of the second region 31B protrude toward the side opposite to the first region 31A. The branch portions 37 have an L-shape in plan view. A conductor 5 is wired in each of the branch portions 37. The branch portions 37 are fixed to the bus bar 2 by welding or the like. The conductors 5 wired in the branch portions 37 are electrically connected to the bus bar 2.

[0025] The base end portion 30 has two protruding portions 30a. One protruding portion 30a protrudes in the second direction Y from the first region 31A of the main body 31. The other protruding portion 30a protrudes in the second direction Y from the second region 31B of the main body 31. The first conductors 5a and the second conductors 5b are arranged in the base end portion 30, bypassing the first slit portion 34, to the protruding portion 30a.

[0026] The step of connecting the bus bar 2 to the branch portion 37 may be performed in a state where the flexible printed wiring board 3 has the connecting portion 36. The step of placing the flexible printed wiring board 3 on the case 4 and the step of accommodating the bus bar 2 in the case 4 may be performed in a state where the flexible printed wiring board 3 has the connecting portion 36.

[0027] 4, the case 4 has a first case portion 4A and a second case portion 4B. The illustrated first case portion 4A and second case portion 4B are separate members. The first case portion 4A corresponds to the first bus bar group 2A and the first region 31A, and the second case portion 4B corresponds to the second bus bar group 2B and the second region 31B. The first case portion 4A and the second case portion 4B are molded, for example, from an insulating synthetic resin.

[0028] The first case portion 4A has a first accommodating portion 41, a first cover portion 42, and a flexible first hinge portion 43. The first accommodating portion 41 accommodates a bus bar 2 of the first bus bar group 2A. The first accommodating portion 41 has a substantially rectangular shape in a plan view. The first accommodating portion 41 has a plurality of accommodating chambers 41a. The plurality of accommodating chambers 41a are arranged along the first direction X. One accommodating chamber 41a accommodates one bus bar 2.

[0029] The first cover portion 42 is a portion that supports the first region 31A of the flexible printed wiring board 3. The first cover portion 42 extends along the first direction X. The first cover portion 42 has a rectangular shape in a plan view. The first cover portion 42 is disposed next to the first accommodation portion 41 in the second direction Y.

[0030] The first hinge portion 43 connects the first housing portion 41 and the first cover portion 42. The first case portion 4A has a plurality of first hinge portions 43. The illustrated first case portion 4A has one first hinge portion 43 for one housing chamber 41a. The first case portion 4A is configured such that the first cover portion 42 overlaps with the first housing portion 41 by bending the first hinge portion 43.

[0031] The second case portion 4B has a second accommodating portion 44, a second cover portion 45, and a flexible second hinge portion 46. The second accommodating portion 44 accommodates the bus bars 2 of the second bus bar group 2B. The second accommodating portion 44 has a substantially rectangular shape in a plan view. The second accommodating portion 44 has a plurality of accommodating chambers 44a. The plurality of accommodating chambers 44a are arranged along the first direction X. One accommodating chamber 44a accommodates one bus bar 2.

[0032] The second cover portion 45 is a portion that supports the second region 31B of the flexible printed wiring board 3. The second cover portion 45 extends along the first direction X. The second cover portion 45 has a rectangular shape in a plan view. The second cover portion 45 is arranged next to the second accommodating portion 44 in the second direction Y.

[0033] The second hinge portion 46 connects the second housing portion 44 and the second cover portion 45. The second case portion 4B has a plurality of second hinge portions 46. The illustrated second case portion 4B has one second hinge portion 46 for one housing chamber 44a. The second case portion 4B is configured such that the second cover portion 45 overlaps with the second housing portion 44 by bending the second hinge portion 46.

[0034] The flexible printed wiring board 3 with the bus bars 2 attached thereto is placed on the case 4 and assembled to the case 4. As shown in FIG. 5, the first region 31A of the flexible printed wiring board 3 is placed on the first cover portion 42. The bus bars 2 of the first bus bar group 2A are inserted into the accommodation chambers 41a of the first accommodation portion 41 and are held by the accommodation chambers 41a. The bus bars 2 are accommodated in the accommodation chambers 41a with the branch portions 37 bent into an S-shape. The first region 31A may be fixed to the first cover portion 42. For example, the first cover portion 42 may be provided with a claw for engaging the first region 31A.

[0035] The second region 31B of the flexible printed wiring board 3 is placed on the second cover portion 45. The bus bars 2 of the second bus bar group 2B are inserted into the accommodation chambers 44a of the second accommodation portion 44 and are held by the accommodation chambers 44a. The bus bars 2 are accommodated in the accommodation chambers 44a with the branch portions 37 bent into an S shape. The second region 31B may be fixed to the second cover portion 45. For example, the second cover portion 45 may be provided with a claw for engaging the second region 31B.

[0036] The connecting portion 36 of the flexible printed wiring board 3 may be cut after the flexible printed wiring board 3 is assembled to the case 4, or may be cut before the flexible printed wiring board 3 is assembled to the case 4. As shown in FIG. 5, the second slit portion 35 is located at the boundary between the first cover portion 42 and the second cover portion 45.

[0037] 6 shows the busbar module 1 mounted on the battery module 110. The electrodes 121 of the battery cells 120 are inserted into through holes in the busbar 2 and accommodated in the accommodation chambers 41a, 44a. The first surface 120a of the battery cells 120 is covered by a first cover portion 42 and a second cover portion 45 of the case 4. Furthermore, the first cover portion 42 is covered by a first region 31A of the flexible printed wiring board 3, and the second cover portion 45 is covered by a second region 31B of the flexible printed wiring board 3. The busbar 2 is fixed to the electrodes 121 by, for example, welding.

[0038] When the fixing of the bus bar 2 and the electrode 121 is completed, the first region 31A and the second region 31B of the flexible printed wiring board 3 are folded back. As shown by an arrow AR1 in FIG. 7, the first region 31A and the first cover portion 42 are folded back so as to cover the first housing portion 41. When the first cover portion 42 is lifted up, the first hinge portion 43 of the first case portion 4A is bent. That is, the first cover portion 42 rotates toward the first housing portion 41 around the first hinge portion 43 as the center of rotation. The first region 31A is folded back while being supported by the first cover portion 42 to cover the first housing portion 41. It is preferable that the first cover portion 42 has an engagement portion that engages with the first housing portion 41.

[0039] The second region 31B and the second cover portion 45 are folded back so as to cover the second accommodating portion 44. The second cover portion 45 rotates toward the second accommodating portion 44 around the second hinge portion 46 as a rotation center. The second region 31B is folded back while being supported by the second cover portion 45 to cover the second accommodating portion 44. The second cover portion 45 preferably has an engagement portion that engages with the second accommodating portion 44.

[0040] 8 and 9 show the busbar module 1 after completion of assembly to the battery module 110. The first region 31A and the first cover portion 42 of the flexible printed wiring board 3 cover the first housing portion 41. As shown in FIG. 8, the busbars 2 and the electrodes 121 of the first busbar group 2A are covered and concealed by the first region 31A and the first cover portion 42. The second region 31B and the second cover portion 45 of the flexible printed wiring board 3 cover the second housing portion 44. As shown in FIG. 8, the busbars 2 and the electrodes 121 of the second busbar group 2B are covered and concealed by the second region 31B and the second cover portion 45.

[0041] 8, the first hinge portion 43 is curved to form a substantial U-shape. This forms an appropriate space between the first housing portion 41 and the first cover portion 42. This prevents the first region 31A from being excessively bent, and protects the conductor 5. Similarly, the second hinge portion 46 forms an appropriate space between the second housing portion 44 and the second cover portion 45, and protects the conductor 5 in the second region 31B.

[0042] 9, the base end 30 of the flexible printed wiring board 3 is located outside the battery module 110 in the first direction X. In other words, the busbar module 1 of this embodiment can open up the space above the battery module 110 from one end to the other end of the battery module 110 in the first direction X. In other words, the busbar module 1 of this embodiment can minimize the area occupied by the battery module 110 to cover it.

[0043] By folding back the first cover portion 42 and the second cover portion 45, the space above the first surface 120a of the battery cell 120 is opened. That is, the space between the first hinge portion 43 and the second hinge portion 46 is opened upward. Therefore, when a member such as a smoke exhaust duct is disposed on the first surface 120a, the busbar module 1 of the present embodiment can be assembled to the battery module 110 without interfering with the member.

[0044] Furthermore, the busbar module 1 of this embodiment can minimize the occupied area when viewed in a plan view. When multiple conductors 5 are arranged in the main body 31, the necessary width of the main body 31 is determined according to the number of conductors 5. In the busbar module 1 of this embodiment, the first region 31A and the second region 31B are overlapped with the accommodation portions 41, 44, so that the occupied area of ​​the busbar module 1 can be reduced while ensuring the necessary width of the main body 31.

[0045] The shape of the flexible printed wiring board 3 of this embodiment and the method of assembling it provide a good FPC yield and facilitate the manufacture of component mounting, etc. Therefore, the bus bar module 1 of this embodiment allows for improved manufacturing efficiency and reduced costs.

[0046] As described above, the bus bar module 1 of this embodiment has a first bus bar group 2A, a second bus bar group 2B, a flexible printed wiring board 3, and a resin case 4. The first bus bar group 2A has a plurality of bus bars 2 aligned along the first direction X. The second bus bar group 2B has a plurality of bus bars 2 aligned along the first direction X and is disposed parallel to the first bus bar group 2A. The flexible printed wiring board 3 has a plurality of first conductors 5a connected to the bus bars 2 of the first bus bar group 2A and a plurality of second conductors 5b connected to the bus bars 2 of the second bus bar group 2B.

[0047] The flexible printed wiring board 3 has a base end 30 and a main body 31. The base end 30 is one end 3a of the flexible printed wiring board 3 in the first direction X, and is connected to an external device. The main body 31 extends from the base end 30 to another end 3b of the flexible printed wiring board 3 in the first direction X. The flexible printed wiring board 3 has a slit 33 that is T-shaped in a plan view. The slit 33 has a first slit portion 34 and a second slit portion 35. The first slit portion 34 is disposed at the base end 30 and extends in a second direction Y perpendicular to the first direction X. The second slit portion 35 crosses the main body 31 from the first slit portion 34 along the first direction X.

[0048] The main body 31 of the flexible printed wiring board 3 is divided into a first region 31A and a second region 31B by the second slit portion 35. The first region 31A is a region having the first conductors 5a. The second region 31B is a region having the second conductors 5b.

[0049] The case 4 has a first case portion 4A and a second case portion 4B. The first case portion 4A has a first housing portion 41, a first cover portion 42, and a first hinge portion 43. The first housing portion 41 houses the first bus bar group 2A. The first cover portion 42 supports the first region 31A of the flexible printed wiring board 3. The first hinge portion 43 connects the first housing portion 41 and the first cover portion 42, and is flexible. The first case portion 4A is configured such that the first region 31A and the first cover portion 42 cover the first bus bar group 2A by bending the first hinge portion 43.

[0050] The second case portion 4B has a second housing portion 44, a second cover portion 45, and a second hinge portion 46. The second housing portion 44 houses the second bus bar group 2B. The second cover portion 45 supports the second region 31B of the flexible printed wiring board 3. The second hinge portion 46 connects the second housing portion 44 and the second cover portion 45, and has flexibility. The second case portion 4B is configured such that the second region 31B and the second cover portion 45 cover the second bus bar group 2B by bending the second hinge portion 46. The bus bar module 1 of this embodiment can reduce the area occupied by the battery module 110 and can open up the space above the battery cells 120.

[0051] The base end 30 of the present embodiment has a protruding portion 30a protruding in the second direction Y relative to the main body 31. In the base end 30, the first conductors 5a and the second conductors 5b are routed to the protruding portion 30a, bypassing the first slit portion 34. With this configuration, a flexible printed wiring board 3 is realized that can be folded back while still ensuring a routing path for the conductors 5.

[0052] 8 and 9, the bus bar module 1 assembled to the battery module 110 has a first bus bar group 2A, a second bus bar group 2B, a flexible printed wiring board 3, and a resin case 4. The flexible printed wiring board 3 has a base end portion 30 and a main body 31. The main body 31 is divided into a first region 31A connected to the first bus bar group 2A and a second region 31B connected to the second bus bar group 2B.

[0053] The case 4 has a first case portion 4A and a second case portion 4B. The first case portion 4A accommodates the first bus bar group 2A and the first region 31A in a state where the first region 31A is folded back so that the first region 31A covers the first bus bar group 2A. The second case portion 4B accommodates the second bus bar group 2B and the second region 31B in a state where the second region 31B is folded back so that the second region 31B covers the second bus bar group 2B. The bus bar module 1 of the present embodiment can reduce the area occupied by the battery module 110 and can open up the space above the battery cells 120.

[0054] Note that, in the flexible printed wiring board 3 before being assembled into the case 4, the first slit portion 34 may be provided with a joint portion similar to the joint portion 36. The joint portion of the first slit portion 34 is cut after the flexible printed wiring board 3 is assembled into the case 4.

[0055] In the case 4, the first case portion 4A and the second case portion 4B may be connected. For example, the case 4 may have a connecting portion that connects the first case portion 4A and the second case portion 4B. In this case, the shape of the case 4 in a plan view may be a U-shape with the first cover portion 42 and the second cover portion 45 folded back, or may be a rectangular frame shape.

[0056] The flexible printed wiring board 3 may have multiple conductor layers. For example, the first conductors 5a may be arranged in multiple layers in the first region 31A and the base end 30. For example, the second conductors 5b may be arranged in multiple layers in the second region 31B and the base end 30.

[0057] The contents disclosed in the above embodiments can be implemented in appropriate combinations. [Explanation of symbols]

[0058] 1 Busbar module 2: bus bar, 2A: first bus bar group, 2B: second bus bar group 3: flexible printed circuit board, 3a, 3b: end portion 4: case, 4A: first case part, 4B: second case part 5: conductor, 5a: first conductor, 5b: second conductor 30: Proximal end, 31: Main body, 31A: First region, 31B: Second region 32: Connector 33: slit, 34: first slit portion, 35: second slit portion 36: Joint, 37: Branch 41: first housing portion, 42: first cover portion, 43: first hinge portion 44: second housing portion, 45: second cover portion, 46: second hinge portion 100: battery pack, 110: battery module 120: battery cell, 120a: first surface 121: Electrode, 121a: First electrode group, 121b: Second electrode group X: first direction, Y: second direction, Z: third direction

Claims

1. a first bus bar group including a plurality of bus bars arranged along a first direction; a second bus bar group including a plurality of bus bars aligned along the first direction and arranged parallel to the first bus bar group; a flexible printed wiring board including a plurality of first conductors connected to the bus bars of the first bus bar group and a plurality of second conductors connected to the bus bars of the second bus bar group; A plastic case and Equipped with the flexible printed wiring board has a base end portion which is one end portion in the first direction and is connected to an external device, and a main body which extends from the base end portion to another end portion in the first direction, The flexible printed wiring board has a T-shaped slit in a plan view, The slit has a first slit portion disposed at the base end portion and extending in a second direction perpendicular to the first direction, and a second slit portion extending from the first slit portion along the first direction through the main body, The main body is divided by the second slit portion into a first region having the first conductor and a second region having the second conductor, The case has a first case portion and a second case portion, the first case portion has a first accommodation portion that accommodates the first bus bar group, a first cover portion that supports the first area, and a flexible first hinge portion that connects the first accommodation portion and the first cover portion, and is configured such that the first area and the first cover portion cover the first bus bar group by bending the first hinge portion; The second case portion has a second accommodating portion that accommodates the second bus bar group, a second cover portion that supports the second region, and a flexible second hinge portion that connects the second accommodating portion and the second cover portion, and is configured such that the second region and the second cover portion cover the second bus bar group by bending the second hinge portion. A busbar module comprising:

2. The base end portion has a protruding portion protruding in the second direction relative to the main body, At the base end portion, the first conductor and the second conductor are routed to the protruding portion, bypassing the first slit portion. The busbar module according to claim 1 .

3. a first bus bar group including a plurality of bus bars arranged along a first direction; a second bus bar group including a plurality of bus bars aligned along the first direction and arranged parallel to the first bus bar group; a flexible printed wiring board including a plurality of first conductors connected to the bus bars of the first bus bar group and a plurality of second conductors connected to the bus bars of the second bus bar group; A plastic case and Equipped with the flexible printed wiring board has a base end portion which is one end portion in the first direction and is connected to an external device, and a main body which extends from the base end portion to another end portion in the first direction, the main body is divided into a first region connected to the first bus bar group and a second region connected to the second bus bar group by a T-shaped slit provided in the flexible printed wiring board, The case has a first case portion and a second case portion, the first case portion includes a first accommodating portion that accommodates the first bus bar group, a first cover portion that supports the first region, and a flexible first hinge portion that connects the first accommodating portion and the first cover portion, the second case portion includes a second accommodating portion that accommodates the second bus bar group, a second cover portion that supports the second region, and a flexible second hinge portion that connects the second accommodating portion and the second cover portion, the first case portion accommodates the first bus bar group and the first region in a state in which the first region is folded back so as to cover the first bus bar group, The second case portion accommodates the second bus bar group and the second region in a state in which the second region is folded back so that the second region covers the second bus bar group. A busbar module comprising:

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