Busbar module

Abstract

We provide a busbar module that reduces the risk of short circuits between the busbar and the wiring. [Solution] A busbar module to be attached to a battery assembly in which multiple battery cells are stacked, comprising a flexible substrate 110 having a resin base film 110A, wiring 112 provided on the base film 110A, and a resin coverlay 110B protecting the wiring 112, and a plurality of busbars connected to the flexible substrate 110, wherein the flexible substrate 110 has a strip-shaped main substrate line and a plurality of branch substrate lines branching from the main substrate line to which the busbars are connected, the busbar connection portion which is the part connected to the branch substrate line is frame-shaped, and the wiring 112 is provided on the surface of the base film 110A opposite to the busbar in the part facing the main line side frame portion 161A which is the part of the busbar connection portion that is closer to the main substrate line.

Description

Technical Field

[0001] The disclosure described in this specification relates to a bus bar module.

Background Art

[0002] Patent Documents 1 and 2 disclose bus bar modules. The bus bar module disclosed in Patent Document 1 includes a flexible substrate and a bus bar. The flexible substrate includes a strip-shaped main line and a plurality of branch lines branching from the main line. A bus bar and a fuse are fixed to the tip of each branch line. Wiring is provided on the flexible substrate, and the wiring is connected to the fuse at the tip of the branch line. The bus bar included in the bus bar module disclosed in Patent Document 2 has a frame shape at the connection piece that is connected to the tip of the branch line of the flexible substrate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a bus bar, the portion connected to the tip of the branch line of the flexible substrate is hereinafter referred to as a bus bar connection portion. When the bus bar connection portion has a frame shape, it is easy to form the potting material into an appropriate shape when the potting material is provided in the region partitioned by the bus bar connection portion. However, as a result of the inventor's study, it has been found that there are the following problems when the bus bar connection portion is formed into a frame shape.

[0005] When the busbar connection is frame-shaped, the wiring passes through the area opposite the busbar connection. In a frame-shaped busbar connection, the portion opposite the wiring is relatively on the main line side of the busbar connection. Hereinafter, the portion opposite the wiring in a frame-shaped busbar connection will be referred to as the main line side frame. The main line side frame is not electrically connected to the wiring.

[0006] A short circuit can cause the busbar to overheat. When the busbar overheats, the heat from the busbar may melt the branch wires. This could lead to a short circuit between the main line frame and the wiring. In other words, there is a risk of a short circuit between the busbar and the wiring.

[0007] Therefore, the purpose of this disclosure is to provide a busbar module that can reduce the risk of short circuits between the busbar and the wiring. [Means for solving the problem]

[0008] The above objectives are achieved by combinations of features described in the independent claims, and the subordinate claims provide further advantageous specific examples. The reference numerals in parentheses in the claims indicate a correspondence with specific embodiments described later as one aspect, and do not limit the disclosed technical scope.

[0009] One disclosure to achieve the above objective is: A busbar module (100) attached to a battery assembly (21) in which multiple battery cells (20) are stacked, A flexible substrate (110) comprising a resin base film (110A), wiring (112) provided on the base film, and a resin coverlay (110B) protecting the wiring, It comprises multiple busbars (140) connected to a flexible circuit board, The flexible circuit board comprises a strip-shaped main circuit board line (111) and a plurality of branch circuit board lines (120) that branch off from the main circuit board line and to which busbars are connected. The busbar has a frame-shaped busbar connection portion (160), which is the part that connects to the circuit board guy wires. The wiring is located within the base film, or on the side of the base film opposite the busbar, in at least a portion of the main line side frame portion (161A), which is the part of the busbar connection that is closer to the main line on the circuit board. This is a busbar module.

[0010] In this busbar module, the wiring is either within the base film or further away from the busbar than the base film, at least in part of the portion of the busbar connection facing the main line frame. Therefore, the resin layer between the wiring and the busbar is thicker compared to when the wiring is on the busbar side of the base film. Consequently, even if the busbar becomes very hot, the resin layer on the busbar side melts, reducing the risk of a short circuit between the busbar and the wiring. [Brief explanation of the drawing]

[0011] [Figure 1] Disassembled perspective view of the battery pack. [Figure 2] A close-up view of a section of the busbar module. [Figure 3] A close-up view of the area around the bus bar. [Figure 4] Enlarged view of the busbar connection. [Figure 5] Figure 4 shows a cross-sectional view along the VV line. [Modes for carrying out the invention]

[0012] The following describes several embodiments for implementing this disclosure with reference to the drawings. In each embodiment, parts corresponding to matters described in a preceding embodiment may be denoted by the same reference numerals, and redundant explanations may be omitted. If only a part of the configuration is described in each embodiment, other embodiments described in a preceding embodiment may be applied to the remaining parts of the configuration.

[0013] (Embodiment) FIG. 1 is an exploded perspective view of the battery pack 1, schematically showing the components of the battery pack 1. The battery pack 1 of the embodiment is mounted on an electric vehicle such as an electric car or a plug-in hybrid car as an example. The battery pack 1 mounted on the vehicle is used as an in-vehicle power source. When mounted on the vehicle, the location of the battery pack 1 is, for example, under the front seat, under the rear seat, and between the rear seat and the trunk room, etc.

[0014] The battery pack 1 includes a plurality of battery cells 20. The battery cells 20 are secondary batteries. Examples of the secondary batteries that can be adopted for the battery cells 20 include, for example, lithium-ion secondary batteries, nickel-metal hydride secondary batteries, organic radical batteries, and the like.

[0015] In the following, the thickness direction of the battery cell 20 may be described as the thickness direction TD. Also, the width direction of the battery cell 20 may be described as the width direction WD, and the height direction of the battery cell 20 may be described as the height direction HT. The thickness direction TD, the width direction WD, and the height direction HT are orthogonal to each other. The battery assembly 21 is formed by stacking a plurality of battery cells 20 in the thickness direction TD.

[0016] The battery pack 1 includes a battery assembly 21, a case 30, a cover 40, a bus bar module 100, and the like. The case 30 houses the battery assembly 21. The case 30 has a bottomed box shape that opens in one direction. The case 30 is formed by die-casting as an example. Aluminum or the like is adopted as the member of the case 30. The case 30 includes a bottom wall 31 and side walls 32. The bottom wall 31 and the side walls 32 are integrally connected.

[0017] The bottom wall 31 has a thin and flat shape and is substantially rectangular in plan view. The side walls 32 stand up in the height direction HT from the edge of the bottom wall 31. The side walls 32 are annular. The bottom wall 31 and the side walls 32 form an accommodation space 33 in the case 30. The battery assembly 21 is housed in this accommodation space 33.

[0018] The battery assembly 21 has a configuration in which a plurality of battery cells 20 are arranged in two rows in the width direction WD. The battery cell 20 has a substantially rectangular parallelepiped shape with a small thickness in the thickness direction TD. The battery cell 20 includes an electrode surface 20A and two main surfaces 20C. The electrode surface 20A is the surface provided with a positive electrode terminal 24 and a negative electrode terminal 25 which are electrode terminals 23. The battery cell 20 is housed in the case 30 with the electrode surface 20A facing the opening side of the case 30. The electrode surface 20A is the surface connecting the two main surfaces 20C. The main surface 20C is the surface along a plane orthogonal to the thickness direction TD. In the battery assembly 21, the main surfaces 20C of each battery cell 20 face each other in the thickness direction TD.

[0019] An end plate 26 is attached to the battery cell 20 located at the end in the thickness direction TD among the plurality of battery cells 20 from the outside. The end plate 26 covers the battery cell 20 located at the end in the thickness direction TD. The end plate 26 is made of a resin member having electrical insulation properties. The cover 40 covers the bus bar module 100 in order to protect the bus bar module 100.

[0020] The bus bar module 100 is arranged above the battery assembly 21. Here, above means the height direction HT, which is the direction from the case 30 toward the cover 40. The bus bar module 100 covers the electrode surfaces 20A of all the battery cells 20 included in the battery assembly 21. The bus bar module 100 includes a flexible substrate 110 and a bus bar 140. The flexible substrate 110 is electrically connected to the electrode terminal 23 of the battery cell 20 via the bus bar 140. A connector 180 is attached to the end of the flexible substrate 110. The connector 180 is connected to a voltage detection line and can be connected to an external voltage detection device. The bus bar 140 is housed in a holder 190.

[0021] Using FIG. 2, the configurations of the bus bar module 100 and the battery assembly 21 will be further described. The flexible substrate 110 is a flexible substrate. The flexible substrate 110 includes a main substrate line 111 and a plurality of substrate branch lines 120.

[0022] The main circuit board line 111 is strip-shaped. One end of the main circuit board line 111 in the longitudinal direction is connected to the connector 180 described above. The main circuit board line 111 is positioned above the battery assembly 21 so as to cover the area between the positive terminal 24 and the negative terminal 25, which are spaced apart in the width direction WD. The main circuit board line 111 extends in the stacking direction of the battery cells 20. The electrode terminals 23 are positioned further outward in the width direction WD than the main circuit board line 111. Multiple circuit board branch lines 120 branch off from the main circuit board line 111. The multiple circuit board branch lines 120 are provided at both ends of the main circuit board line 111 in the width direction WD.

[0023] The busbar 140 is made of conductive metal. The busbar 140 comprises a busbar body 150 and a busbar connector 160. The busbar body 150 is the portion through which the positive terminal 24 of one battery cell 20 and the negative terminal 25 of an adjacent battery cell 20 pass. Nuts 130 are fitted to the positive terminal 24 and the negative terminal 25, passing through the busbar body 150.

[0024] A resin frame 27 is fitted onto the battery cell 20. The resin frame 27 is made of a resin material that has electrical insulating properties. The resin frame 27 has a portion that faces the main surface 20C of the battery cell 20 and a portion that faces the side surface of the battery cell 20.

[0025] Figure 3 is an enlarged view of the substrate guy wire 120 and busbar 140. The substrate guy wire 120 comprises a first guy wire section 121 and a second guy wire section 122. The first guy wire section 121 protrudes in the width direction WD from the end of the substrate main line 111 in the width direction WD. The second guy wire section 122 is provided at the end of the first guy wire section 121 that is away from the substrate main line 111. The second guy wire section 122 is strip-shaped. The second guy wire section 122 extends in the height direction HT from the first guy wire section 121 toward the electrode surface 20A. Furthermore, the position of the second guy wire section 122 in the width direction WD does not change regardless of the change in the position in the height direction HT. On the other hand, the position of the second guy wire section 122 in the thickness direction TD changes with the change in the position in the height direction HT.

[0026] The main substrate wire 111 is positioned above the electrode surface 20A, with a length approximately equal to the height HT of the second branch wire section 122. The second branch wire section 122 curves as it extends towards the electrode surface 20A in the height HT direction. The second branch wire section 122 comprises two curved sections 123 that curve in opposite directions. The two curved sections 123 are arranged continuously in the height HT direction. The curved section 123 closer to the first branch wire section 121 is designated as the base-side curved section 124, and the other as the tip-side curved section 125. The tip portion of the second branch wire section 122 is designated as the branch wire tip section 126.

[0027] The branch wire tip 126 is the portion of the second branch wire section 122 that is closer to the tip than the tip-side curved section 125. The base-side curved section 124 has a curved shape that protrudes toward the branch wire tip 126. On the other hand, the tip-side curved section 125 has a curved shape that protrudes toward the opposite side from the branch wire tip 126. The branch wire tip 126 is substantially flat. The branch wire tip 126 is located between the main circuit board line 111 and the battery assembly 21 in the height direction HT. The branch wire tip 126 is located above the electrode surface 20A in the height direction HT.

[0028] The elements of the flexible substrate 110, namely the main substrate line 111, the first branch line section 121, and the second branch line section 122, are each flexibly deformable. The main substrate line 111 and the first branch line section 121 are particularly flexibly deformable in the height direction HT. The second branch line section 122 is particularly flexibly deformable in the height direction HT and the thickness direction TD.

[0029] The busbar 140 is a flattened metal plate-like member in the height direction HT. For example, the busbar 140 is made mainly of copper. The busbar 140 comprises a busbar body 150 and a busbar connection part 160 that protrudes from the busbar body 150. The busbar body 150 is the part that is electrically connected to the electrode terminal 23. The busbar connection part 160 extends in the width direction WD from the busbar body 150 toward the branch wire tip 126.

[0030] The busbar body 150 is provided with two through-holes 151 through which the positive terminal 24 and negative terminal 25, adjacent to each other in the thickness direction TD, pass. With the positive terminal 24 and negative terminal 25 passing through the two through-holes 151, nuts 130 are fixed to the positive terminal 24 and negative terminal 25, respectively. This connects the electrode terminals 23 and the busbar body 150 electrically and mechanically.

[0031] Figure 4 is a magnified view of the area around the busbar connection portion 160 compared to Figure 3. The busbar connection portion 160 is the part of the busbar 140 that is connected to the flexible circuit board 110. Specifically, the busbar connection portion 160 is fixed to the branch wire tip portion 126 by solder 170. The busbar connection portion 160 has a frame shape. The busbar connection portion 160 is roughly rectangular in top view. The busbar connection portion 160 comprises three frame portions 161 and a base portion 162.

[0032] The base portion 162 is a continuous part of the busbar body 150. The frame portion 161 facing the base portion 162 is the second frame portion 161B. The frame portion 161 connecting one end of the base portion 162 and the second frame portion 161B is the first frame portion 161A. The frame portion 161 connecting the other end of the base portion 162 and the second frame portion 161B is the third frame portion 161C. The first frame portion 161A is the part of the busbar connection portion 160 that is closer to the main circuit board line 111, and corresponds to the main circuit board side frame portion.

[0033] The framed region 171 is demarcated by the base portion 162, the first frame portion 161A, the second frame portion 161B, and the third frame portion 161C. The busbar module 100 includes a chip fuse 172. The chip fuse 172 is located in the framed region 171. The chip fuse 172 is also fixed to the branch wire end portion 126 by solder 170.

[0034] Figure 5 is a cross-sectional view of the VV line in Figure 4. Note that Figure 5 is a diagram illustrating the laminated structure, and for illustrative purposes, the thickness of each layer differs from the actual thickness. Figure 5 shows a cross-section of the branch end portion 126, which is the tip of the substrate branch wire 120. Not limited to the branch end portion 126, the flexible substrate 110 has a structure in which a coverlay 110B is laminated on a base film 110A, as shown in Figure 5. Wiring 112 is provided between the base film 110A and the coverlay 110B.

[0035] The base film 110A is a flexible and electrically insulating resin film. The material of the base film 110A is, for example, polyimide. The coverlay 110B protects the wiring 112. In this embodiment, the wiring 112 is a voltage detection wire. The voltage detection wire is for detecting the voltage of the battery cell 20.

[0036] The coverlay 110B is laminated onto the entire surface of the flexible substrate 110 where the wiring pattern is formed, using an adhesive or the like, after the wiring pattern has been formed on the base film 110A. In Figure 5, the adhesive layer is also shown collectively as the coverlay 110B. The coverlay 110B is also made of a resin with electrical insulating properties. The material of the coverlay 110B may be the same as or different from that of the base film 110A.

[0037] The first frame section 161A and the third frame section 161C of the frame section 161 have a rectangular cross-section. The wiring 112 is located on the upper surface of the base film 110A in the portion connected to the chip fuse 172. The upper surface is the side where the chip fuse 172 is located. Potting material 173 is provided in the area enclosed by the frame section 161 and the base section 162. Note that the potting material 173 is omitted in all figures except Figure 5.

[0038] A portion of the wiring 112 is a through-hole 113. The through-hole 113 is provided between the first frame portion 161A and the chip fuse 172. One end of the through-hole 113 is exposed on the side of the base film 110A where the chip fuse 172 is located. Therefore, one end of the through-hole 113 is on the chip fuse 172 side of the base film 110A. The through-hole 113 extends from one end in the thickness direction of the base film 110A and penetrates the base film 110A.

[0039] The wiring 112 is located on the underside of the base film 110A on the side further from the chip fuse 172 than the through-hole 113. The underside is the side opposite to the side where the chip fuse 172 is provided. The end of the wiring 112 on the side further from the chip fuse 172 than the through-hole 113 is connected to the connector 180. In this embodiment, the wiring 112 is provided on the underside of the base film 110A from the through-hole 113 to the connector 180. Therefore, the wiring 112 is provided on the underside of the base film 110A in the portion facing the first frame portion 161A. The opposing portion means the portion where the position TD in the thickness direction is the same.

[0040] As shown in Figure 4, the wiring 112 extends from the chip fuse 172 toward the base 162. The end of the portion of the wiring 112 that extends toward the base 162 is connected to the busbar body 150.

[0041] In the busbar module 100 of this embodiment, the wiring 112 is located on the side of the base film 110A opposite to the first frame portion 161A (i.e., opposite to the busbar 140) in the portion facing the first frame portion 161A. Therefore, the resin layer between the wiring 112 and the busbar 140 consists of the coverlay 110B and the base film 110A. Thus, the resin layer between the wiring 112 and the busbar 140 becomes thicker compared to the case where the wiring 112 is on the same side as the busbar 140 in the base film 110A. This reduces the risk of the resin layer melting and causing a short circuit between the busbar 140 and the wiring 112 even if the busbar 140 becomes very hot due to a short circuit.

[0042] Furthermore, if the wiring 112 is provided on the upper surface of the flexible substrate 110 in the portion facing the main line side frame portion 161A, a protrusion will be created on the surface of the flexible substrate 110 in the portion where the wiring 112 is provided, equal to the thickness of the wiring 112. Even if this protrusion is created, in order to prevent the potting material 173 from leaking out of the frame inner region 171, it is necessary to form a recess in the first frame portion 161A that corresponds to the protrusion created on the surface of the flexible substrate 110.

[0043] In contrast, in this embodiment, the wiring 112 is located on the side of the base film 110A opposite to the first frame portion 161A in the portion facing the first frame portion 161A. Therefore, there is no need to form a recess in the first frame portion 161A.

[0044] If the wiring 112 is provided on the same plane as the busbar 140 in the base film 110A in the portion facing the main line side edge 161E, a relatively larger shear force is applied to the portion of the wiring 112 that is close to the main line side edge 161E compared to other portions. This shear force raises concerns that the wiring 112 may break.

[0045] In particular, the substrate branch wire 120 is continuous with the branch wire tip 126 and has a curved tip-side curved portion 125 that protrudes on the opposite side from the branch wire tip 126. Due to the curved shape of this tip-side curved portion 125, the shear force applied to the part close to the main wire side edge 161E increases. Therefore, there is a greater concern that the wiring 112 may break.

[0046] However, in this embodiment, the portion of the wiring 112 facing the main line side edge 161E is provided on the base film 110A on the side opposite to the busbar 140. Therefore, breakage of the wiring 112 is less likely to occur.

[0047] Although embodiments have been described above, the disclosed technology is not limited to the embodiments described above. The following modifications are also included within the scope of disclosure, and further modifications can be made in various ways without departing from the gist of the invention.

[0048] (Variation 1) In this embodiment, the wiring 112 was located on the lower surface of the base film 110A in the portion facing the main line side frame portion 161A. However, the wiring 112 may also be located inside the base film 110A in the portion facing the main line side frame portion 161A. To position the wiring 112 inside the base film 110A, blind vias can be formed instead of through holes 113, and the base film 110A can be made into a multi-layer structure. By sandwiching the wiring 112 between one layer constituting the base film 110A and another layer constituting the base film 110A, the wiring 112 can be positioned inside the base film 110A.

[0049] (Modification 2) In this embodiment, the wiring 112 was located on the underside of the base film 110A for the entire portion facing the main line side frame portion 161A. However, the wiring 112 may be located on the underside of the base film 110A for only a portion of the portion facing the main line side frame portion 161A. Alternatively, the wiring 112 may be located within the base film 110A for only a portion of the portion facing the frame portion 161. The portion facing the frame portion 161 may or may not include the portion facing the main line side edge portion 161E.

[0050] (Variation 3) In the embodiment, the wiring 112 was a voltage detection line for detecting the voltage of the battery cell 20. However, the wiring 112 may be used for purposes other than detecting the voltage of the battery cell 20. For example, the wiring 112 may be a line connected to a thermistor for detecting the temperature of the battery cell 20. Also, multiple wirings 112 may be provided on a single board branch wire 120.

[0051] (Modification 4) In this embodiment, the wiring 112 is provided on the lower surface of the base film 110A up to the connector 180 on the side further from the chip fuse 172 than the through-hole 113. However, the wiring 112 may be provided on the upper surface of the base film 110A or within the base film 110A on the side closer to the connector 180 than the main line side frame portion 161A. (Disclosure of technical ideas) This specification discloses several technical concepts, as listed in the following paragraphs. Some paragraphs are written in a multiple dependent form, where subsequent paragraphs optionally refer to preceding paragraphs. Furthermore, some paragraphs are written in a multiple dependent form, referring to other multiple dependent forms. These paragraphs written in multiple dependent forms define several technical concepts.

[0052] (Technical thought 1) A busbar module (100) attached to a battery assembly (21) in which multiple battery cells (20) are stacked, A flexible substrate (110) comprising a resin base film (110A), wiring (112) provided on the base film, and a resin coverlay (110B) protecting the wiring, The flexible substrate is connected to a plurality of busbars (140), The flexible substrate comprises a strip-shaped main substrate line (111) and a plurality of branch substrate lines (120) that branch off from the main substrate line and to which the busbars are connected. The busbar has a frame-shaped busbar connection portion (160) which is the part connected to the substrate guy wire. The aforementioned wiring is located within the base film, or on the side of the base film opposite to the busbar, in at least a portion of the main line side frame portion (161A), which is the portion of the busbar connection portion that is closer to the main line on the circuit board. Busbar module.

[0053] (Technical thought 2) The wiring is such that the portion of the main line side frame portion facing the main line side edge portion (161E), which is the edge of the main line side of the substrate, is located within the base film, or is provided on the side of the base film opposite to the busbar. The busbar module described in Technical Concept 1.

[0054] (Technical Thought 3) The aforementioned substrate guy wire is The branch wire end (126) to which the busbar is connected, It is continuous with the tip of the branch wire and has a curved portion (125) that protrudes on the opposite side from the tip of the branch wire, A busbar module as described in Technical Idea 1 or 2.

[0055] (Technical Thought 4) The aforementioned wiring is located within the base film in all portions facing the main line side frame, or is provided on the base film on the side opposite to the busbar. A busbar module as described in any one of the technical concepts 1-3.

[0056] (Technical Thought 5) The aforementioned wiring is provided on the base film on the side opposite to the busbar in all portions facing the main line side frame. The busbar module described in Technical Idea 4.

[0057] (Technical Thought 6) In the area surrounded by the busbar connection portion, the fuse (172) provided on the flexible substrate and A potting material (173) is provided in the area surrounded by the busbar connection portion and covers the fuse. A busbar module described in any one of the technical concepts 1-5.

[0058] (Technical Thought 7) The wiring is connected to the fuse, and between the main line side frame portion of the busbar connection and the fuse, there is a portion that extends from the fuse side of the base film in the thickness direction of the base film. The busbar module described in Technical Idea 6. [Explanation of Symbols]

[0059] 20...Battery cell, 21...Battery assembly, 100...Busbar module, 110...Flexible circuit board, 110A...Base film, 110B...Coverlay, 111...Main circuit board line, 112...Wiring, 120...Branch circuit board line, 125...Curved end section (curved section), 126...Branch line end section, 140...Busbar, 160...Busbar connection section, 161A...First frame section (main line side frame section), 161E...Main line side edge section, 172...Chip fuse (fuse), 173...Potting material

Claims

1. A busbar module (100) attached to a battery assembly (21) in which multiple battery cells (20) are stacked, A flexible substrate (110) comprising a resin base film (110A), wiring (112) provided on the base film, and a resin coverlay (110B) protecting the wiring, The flexible substrate is connected to a plurality of busbars (140), The flexible substrate comprises a strip-shaped main substrate line (111) and a plurality of branch substrate lines (120) that branch off from the main substrate line and to which the busbars are connected. The busbar has a frame-shaped busbar connection portion (160) which is the part connected to the substrate guy wire. The aforementioned wiring is located within the base film, or on the side of the base film opposite to the busbar, in at least a portion of the main line side frame portion (161A), which is the portion of the busbar connection portion that is closer to the main line on the circuit board. Busbar module.

2. The wiring is such that the portion of the main line side frame portion facing the main line side edge portion (161E), which is the edge of the main line side of the substrate, is located within the base film, or is provided on the side of the base film opposite to the busbar. The busbar module according to claim 1.

3. The aforementioned substrate guy wire is The branch wire tip (126) to which the busbar is connected, It is continuous with the tip of the branch line and has a curved portion (125) that protrudes on the opposite side from the tip of the branch line, The busbar module according to claim 1.

4. The aforementioned wiring is located within the base film in all portions facing the main line side frame, or is provided on the base film on the side opposite to the busbar. A busbar module according to any one of claims 1 to 3.

5. The aforementioned wiring is provided on the base film on the side opposite to the busbar in all portions facing the main line side frame. The busbar module according to claim 4.

6. In the area surrounded by the busbar connection portion, the fuse (172) provided on the flexible substrate and A potting material (173) is provided in the area surrounded by the busbar connection portion and covers the fuse. A busbar module according to any one of claims 1 to 3.

7. The wiring is connected to the fuse, and between the main line side frame portion of the busbar connection and the fuse, there is a portion that extends from the fuse side of the base film in the thickness direction of the base film. The busbar module according to claim 6.

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