Wiring module

Abstract

A wiring module 20, which is attached to a plurality of power storage elements having electrode terminals, comprises a bus bar 30 and a wiring material 40. The bus bar 30 includes electrode connection parts 31 to be connected to the electrode terminals, and a lamination part 32 composed of a laminate of a plurality of plate-shaped base materials and connecting two adjacent electrode connection parts 31. The lamination part 32 includes a wiring material connection part 37 electrically connected to the wiring material 40.

Description

Wiring Module

[0001] The present disclosure relates to a wiring module.

[0002] A busbar described in Japanese Patent Laid-Open No. 2023-47446 (Patent Document 1) is known. The busbar in Patent Document 1 includes two connection portions and an intermediate portion connecting the two connection portions. The connection portions are connected to electrode terminals of an energy storage element. The intermediate portion has a mountain shape that protrudes upward from the connection portions. The intermediate portion can absorb misalignment between the two connection portions. The busbar is constructed by stacking multiple plate-shaped base materials in the vertical direction. This allows the intermediate portion to be formed more flexibly than when the busbar is constructed from a single metal plate.

[0003] Furthermore, Japanese Patent Laid-Open Publication No. 2019-207825 (hereinafter referred to as Patent Document 2) describes a wiring module including a connection bus bar connected to an electrode terminal and a voltage detection wire. The connection bus bar has a bent portion that protrudes in a direction away from the electrode terminal (upward). The voltage detection wire is connected to a portion of the connection bus bar that is connected to the electrode terminal (a portion different from the bent portion) via a voltage detection terminal.

[0004] JP 2023-47446 A JP 2019-207825 A

[0005] When configuring a wiring module by connecting wiring materials such as voltage detection wires to the bus bar of Patent Document 1, the wiring materials are connected to the connection portions of the bus bar if the configuration described in Patent Document 2 is applied. However, for example, if the bus bar is made smaller, it may be difficult to simultaneously connect the connection portions to the wiring materials and the connection portions to the electrode terminals.

[0006] Furthermore, it is preferable that the connection portion has a predetermined strength for the process of connecting with the electrode terminal, but since the bus bar in Patent Document 1 is constructed by stacking multiple base materials, there is a risk that the strength of the connection portion will be reduced.

[0007] The wiring module of the present disclosure is a wiring module that is attached to a plurality of energy storage elements having electrode terminals, and includes a bus bar and wiring material, the bus bar including an electrode connection portion that is connected to the electrode terminals, and a laminate portion that is formed by stacking a plurality of plate-shaped base materials and connects two adjacent electrode connection portions, and the laminate portion includes a wiring material connection portion that is electrically connected to the wiring material.

[0008] According to the present disclosure, it is possible to provide a wiring module that has excellent connection reliability between a bus bar and an electrode terminal, and between a bus bar and a wiring material.

[0009] FIG. 1 is a plan view of an energy storage module according to a first embodiment. FIG. 2 is an enlarged perspective view of a wiring module according to the first embodiment. FIG. 3 is an enlarged bottom view of the wiring module according to the first embodiment. FIG. 4 is a plan view of a bus bar according to the first embodiment. FIG. 5 is a side view of the bus bar according to the first embodiment. FIG. 6 is an enlarged side view of a laminated portion of the bus bar shown in FIG. 5. FIG. 7 is an enlarged perspective view of a wiring module according to a second embodiment. FIG. 8 is an enlarged bottom view of the wiring module according to the second embodiment. FIG. 9 is an enlarged perspective view of a wiring module according to another embodiment.

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described. [1] A wiring module of the present disclosure is a wiring module attached to a plurality of energy storage elements having electrode terminals, and includes a bus bar and wiring material, the bus bar includes an electrode connection portion connected to the electrode terminals, and a laminate portion configured by laminating a plurality of plate-shaped base materials and connecting two adjacent electrode connection portions, and the laminate portion includes a wiring material connection portion electrically connected to the wiring material.

[0011] With this configuration, the electrode connection portion can be formed separately from the laminated portion having a configuration in which multiple base materials are laminated, thereby improving the strength of the electrode connection portion and facilitating electrical connection between the electrode connection portion and the electrode terminal.

[0012] Furthermore, with the above configuration, the bus bar and the wiring can be electrically connected by the wiring member connection portion of the laminated portion. Furthermore, since there is no need to provide a wiring member connection portion at the electrode connection portion, it is easier to ensure electrical connection between the electrode connection portion and the electrode terminal, even when the bus bar is miniaturized, for example.

[0013] [2] In the above [1], it is preferable that the laminated portion includes an overlapping portion that overlaps with the electrode connecting portion and is connected to the electrode connecting portion, and the overlapping portion includes the wiring material connecting portion.

[0014] According to this configuration, the wiring member connection portion is formed in the overlapping portion of the laminated portion that is connected to the electrode connection portion. The overlapping portion is a portion of the laminated portion that is less flexible because it overlaps with and is connected to the electrode connection portion. Therefore, by providing the wiring member connection portion in the overlapping portion, it is possible to prevent a loss of flexibility in the portion of the laminated portion that is not overlapped with the electrode connection portion and to prevent stress from being applied to the connection portion between the wiring member connection portion and the wiring member.

[0015] [3] In the above [1] or [2], it is preferable that the electrode connection portion is made of a first metal, the plurality of substrates include at least one first substrate made of the first metal and at least one second substrate made of a second metal different from the first metal, the wiring material includes a conductor portion made of the second metal, the electrode connection portion is connected to the first substrate, and the wiring material connection portion is formed of a second substrate and connected to the conductor portion.

[0016] With this configuration, the connection between the electrode connection portion and the laminated portion, and the connection between the wiring member connection portion and the wiring member are made between metals of the same kind, which makes these connections easier.

[0017] [4] In any one of [1] to [3] above, the laminated portion preferably has an extension portion extending outward from the electrode connection portion in a third direction perpendicular to both a first direction in which the electrode connection portions are arranged and a second direction in which the electrode connection portions and the electrode terminals face each other, and the extension portion preferably has the wiring material connection portion.

[0018] With this configuration, even when the wiring material is extended in the first direction, the wiring material and the wiring material connecting portion can be connected.

[0019] [Details of the Embodiments of the Present Disclosure] The following describes embodiments of the present disclosure. The present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims. In the drawings, for the convenience of explanation, some components may be exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ between drawings. In this specification, "orthogonal" does not only refer to a strict orthogonal relationship, but also includes a roughly orthogonal relationship within the scope of the operation and effect of this embodiment.

[0020] In addition, "facing" in this specification refers to surfaces or components facing each other, and includes not only cases where they are completely facing each other, but also cases where they are partially facing each other. In addition, "facing" in this specification includes both cases where a component separate from the two components is interposed between the two components, and cases where nothing is interposed between the two components.

[0021] First Embodiment A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. An energy storage module 10 including a wiring module 20 according to this embodiment is mounted on a vehicle as a power source for driving the vehicle, such as an electric vehicle or a hybrid vehicle. In the following description, the direction indicated by arrow Z is referred to as upward, the direction indicated by arrow X as forward, and the direction indicated by arrow Y as leftward. Note that, in some cases, when multiple identical components are shown, only some of the components will be designated by reference numerals, and the reference numerals for the other components will be omitted.

[0022] As shown in FIG. 1 , the energy storage module 10 includes a plurality of energy storage elements 11 arranged in a row and a wiring module 20 attached to the upper surfaces of the plurality of energy storage elements 11. The wiring modules 20 are attached to both left-right end portions of the plurality of energy storage elements 11. The energy storage elements 11 have a flat rectangular parallelepiped shape with energy storage elements housed inside. The energy storage elements 11 have two electrode terminals 12 at both left-right end portions of their upper surfaces. One of the two electrode terminals 12 is a positive electrode and the other is a negative electrode. The electrode terminals 12 are electrically connected to bus bars 30.

[0023] (Wiring Module 20) As shown in Figs. 1 to 3, the wiring module 20 includes a bus bar 30 and wiring members 40 connected to the bus bar 30.

[0024] (Busbar 30, Electrode Connection Portion 31, First Metal M1) As shown in FIG. 4 , the busbar 30 has a rectangular shape in a plan view. The busbar 30 includes two electrode connection portions 31 and a laminated portion 32 connecting two adjacent electrode connection portions 31. The two electrode connection portions 31 are arranged side by side in the front-to-rear direction. As shown in FIG. 5 , the electrode connection portion 31 is formed by bending a single metal plate. In this embodiment, the electrode connection portion 31 is made of a first metal M1. The first metal M1 is, for example, aluminum or an aluminum alloy. The electrode connection portion 31 includes a main body portion 31A and an extension portion 31B extending from the main body portion 31A. As shown in FIG. 4 , the electrode connection portion 31 has a through hole 31C that passes through the main body portion 31A in the up-down direction.

[0025] As shown in FIG. 1 , the main body portion 31A is disposed so as to face the electrode terminal 12 in the vertical direction, and is connected to the electrode terminal 12 by, for example, welding. In this embodiment, the electrode terminal 12 is made of a first metal M1. Because the electrode terminal 12 and the main body portion 31A are made of the same metal, electrical connection between the electrode terminal 12 and the main body portion 31A is facilitated. In addition, electrolytic corrosion is prevented at the connection portion between the electrode terminal 12 and the main body portion 31A. The through hole 31C engages with a protrusion (not shown) protruding from the electrode terminal 12. This positions the bus bar 30 and the electrode terminal 12.

[0026] (Laminated portion 32, substrate 33, first substrate 33A, second substrate 33B, second metal M2) As shown in FIGS. 5 and 6 , the laminated portion 32 is configured by stacking a plurality of plate-shaped substrates 33. The substrates 33 are, for example, thin metal plates or metal foils. The plurality of substrates 33 are connected to each other, for example, by welding or brazing. As shown in FIG. 6 , in this embodiment, the plurality of substrates 33 include a plurality of (specifically, seven) first substrates 33A and one second substrate 33B. The first substrate 33A is configured from a first metal M1. The second substrate 33B is configured from a second metal M2 different from the first metal M1. The second metal M2 is, for example, copper or a copper alloy.

[0027] (Overlapping Portion 34) As shown in FIG. 5 , the laminated portion 32 includes two overlapping portions 34 overlapping the extension portions 31B, and a main body portion 35 disposed between the two overlapping portions 34. In this embodiment, the overlapping portions 34 are overlapped below the extension portions 31B. The upper surface of the overlapping portions 34 is connected to the extension portions 31B, for example, by welding. As shown in FIG. 6 , in the overlapping portion 34, the first substrate 33A and the second substrate 33B are vertically stacked, and the second substrate 33B is disposed at the bottom of the multiple substrates 33. The multiple first substrates 33A are disposed above the single second substrate 33B. That is, the upper surface of the overlapping portion 34 is formed of the first substrate 33A and the first metal M1. Because the extension portions 31B are also formed of the first metal M1, electrical connection between the upper surface of the overlapping portions 34 and the extension portions 31B is facilitated. Furthermore, electrolytic corrosion is prevented at the connection portion between the overlapping portion 34 and the extension portion 31B.

[0028] As shown in FIG. 5 , in this embodiment, the main body portion 35 is formed in a mountain-like shape that protrudes upward from the overlapping portion 34. The main body portion 35 includes two side portions 35A rising from the overlapping portion 34 and a ceiling portion 35B connecting the upper ends of the two side portions 35A. By providing the main body portion 35 in a mountain-like shape, the main body portion 35 is made elastically deformable, and the two electrode connection portions 31 are allowed to be displaced relative to each other in the front-to-back and up-to-down directions to a certain extent. This makes it possible to absorb assembly tolerances between the electrode connection portions 31 and the electrode terminals 12. Furthermore, it is possible to allow for expansion and contraction of the energy storage element 11 due to temperature changes.

[0029] As shown in Fig. 3, the laminated portion 32 has a plurality of slits 36 formed therein, which penetrate the main body portion 35 and a portion of the overlapping portion 34 closer to the main body portion 35. Each slit 36 ​​extends in the front-to-rear direction. By providing the slits 36 in the main body portion 35, it is possible to allow the two electrode connection portions 31 to be displaced from each other in the left-to-right direction to some extent. This makes it possible to allow expansion and contraction of the energy storage element 11 due to temperature changes.

[0030] (Wiring Connection Portion 37) As shown in Figures 2 and 3, one of the two overlapping portions 34 included in the laminated portion 32 includes a wiring connection portion 37. The wiring connection portion 37 is a portion of the bus bar 30 that is electrically connected to the wiring 40 described below. In Figures 2 and 3, the wiring connection portion 37 is located in the overlapping portion 34 located on the front side. The wiring connection portion 37 is located on the underside of the overlapping portion 34. In the overlapping portion 34, the substrate 33 located on the lowermost side is the second substrate 33B (see Figure 6). Therefore, the wiring connection portion 37 is part of the second substrate 33B and is formed of the second metal M2.

[0031] (Wiring Material 40) As shown in FIG. 3, the wiring material 40 includes a conductor portion 41 and a support member 42 that supports the conductor portion 41. In this embodiment, the wiring material 40 is a flexible printed circuit board. The support member 42 is made of an insulating synthetic resin and includes a base film and a coverlay film. In this embodiment, the conductor portion 41 is made of a second metal M2. The conductor portion 41 has a thin wire shape. A land portion 41A is formed at the end of the conductor portion 41. The land portion 41A is wider than the remaining portion of the conductor portion 41. The conductor portion 41 is formed on the base film and is covered from above by a coverlay film. An opening that exposes the land portion 41A upward is formed in the coverlay film.

[0032] The wiring member 40 includes a main body 43 extending in the front-rear direction and a connecting piece 44 extending in the left-right direction from the main body 43. A land portion 41A is disposed on the connecting piece 44. The connecting piece 44 is overlapped below the wiring member connecting portion 37 of the overlapping portion 34. The land portion 41A and the wiring member connecting portion 37 are connected by, for example, soldering. The land portion 41A and the wiring member connecting portion 37 are formed of the second metal M2, facilitating electrical connection between the land portion 41A and the wiring member connecting portion 37.

[0033] The end of the conductor 41 opposite to the land 41A is connected to a connector (not shown). This connector is adapted to be connected to an external ECU (Electronic Control Unit) or the like. The ECU is equipped with a microcomputer, elements, etc., and has a well-known configuration having functions for detecting the voltage, current, temperature, etc. of each storage element 11 and controlling the charge and discharge of each storage element 11. The conductor 41 functions as a voltage detection line.

[0034] The overlapping portion 34 of the laminated portion 32 is connected to the electrode connection portion 31 and is therefore less likely to deform. On the other hand, the main body portion 35 of the laminated portion 32 is elastically deformable and flexible. Unlike the present embodiment, if a wiring member connection portion were provided on the main body portion, the connection to the wiring member could impair the flexibility of the main body portion. Furthermore, there is a risk that stress will be applied to the connection between the wiring member connection portion and the wiring member when the main body portion deforms. However, in the present embodiment, the wiring member connection portion 37 is provided on the overlapping portion 34, not on the main body portion 35. This allows the flexibility of the main body portion 35 to be maintained, and the reliability of the connection between the bus bar 30 and the wiring member 40 to be maintained.

[0035] (Action and effect of embodiment 1) (1-1) The wiring module 20 of embodiment 1 is a wiring module 20 attached to a plurality of energy storage elements 11 having electrode terminals 12, and includes a bus bar 30 and wiring material 40. The bus bar 30 includes an electrode connection portion 31 connected to the electrode terminals 12, and a laminated portion 32 configured by stacking a plurality of plate-shaped substrates 33 and connecting two adjacent electrode connection portions 31. The laminated portion 32 includes a wiring material connection portion 37 electrically connected to the wiring material 40.

[0036] With this configuration, the electrode connection portion 31 can be formed separately from the laminate portion 32, which is configured by laminating a plurality of base materials 33, thereby improving the strength of the electrode connection portion 31. This makes it easier to electrically connect the electrode connection portion 31 and the electrode terminal 12.

[0037] Furthermore, with the above configuration, the bus bar 30 and the wiring member 40 can be electrically connected by the wiring member connection portion 37 provided in the laminated portion 32. Furthermore, since the wiring member connection portion 37 does not need to be provided in the electrode connection portion 31, it is easier to ensure electrical connection between the electrode connection portion 31 and the electrode terminal 12 even when, for example, the bus bar 30 is miniaturized.

[0038] (1-2) In the first embodiment, the laminated portion 32 includes an overlapping portion 34 that overlaps with and is connected to the electrode connecting portion 31 , and the overlapping portion 34 includes a wiring member connecting portion 37 .

[0039] With this configuration, wiring member connection portion 37 is formed in overlapping portion 34 of laminated portion 32, which is connected to electrode connection portion 31. Overlapping portion 34 is configured to overlap electrode connection portion 31 and be connected to electrode connection portion 31, and is therefore a less flexible portion of laminated portion 32. Therefore, by providing wiring member connection portion 37 in overlapping portion 34, it is possible to prevent a loss of flexibility in portions of laminated portion 32 that are not overlapped with electrode connection portion 31 and to prevent stress from being applied to the connection portion between wiring member connection portion 37 and wiring member 40.

[0040] (1-3) In embodiment 1, the electrode connection portion 31 is made of a first metal M1, the multiple substrates 33 include at least one first substrate 33A made of the first metal M1 and at least one second substrate 33B made of a second metal M2 different from the first metal M1, the wiring material 40 includes a conductor portion 41 made of the second metal M2, the electrode connection portion 31 is connected to the first substrate 33A, and the wiring material connection portion 37 is formed of the second substrate 33B and connected to the conductor portion 41.

[0041] With this configuration, for example, when the electrode terminal 12 is made of the first metal M1 and the conductor portion 41 is made of the second metal M2, the connection between the electrode terminal 12 and the electrode connecting portion 31, the connection between the electrode connecting portion 31 and the laminate portion 32, and the connection between the wiring member connecting portion 37 and the wiring member 40 are connections between the same metals, thereby facilitating these connections.

[0042] Second Embodiment A second embodiment of the present disclosure will be described with reference to FIGS. 7 and 8 . A wiring module 120 according to the second embodiment includes a bus bar 130 and wiring members 140. In this embodiment, the front-rear direction is an example of a first direction. The up-down direction is an example of a second direction. The left-right direction is an example of a third direction. Hereinafter, the same components as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and descriptions thereof may be omitted. Furthermore, descriptions of effects that overlap with those in the first embodiment will be omitted.

[0043] The busbar 130 includes two electrode connection portions 31 and a laminated portion 132. As in the first embodiment, the laminated portion 132 includes a plurality of first substrates 33A and a single second substrate 33B stacked below the plurality of first substrates 33A (see FIG. 6 ). The laminated portion 132 has an extending portion 138 that extends to the left of the electrode connection portion 31 in the width direction (left-right direction) of the busbar 30. The extending portion 138 is composed only of the second substrate 33B. The extending portion 138 includes a wiring material connection portion 137 on its underside.

[0044] The wiring material 140 does not include the connecting piece 44 of the first embodiment, but only includes a main body 43 extending in the front-rear direction. That is, the wiring material 140 extends in the front-rear direction in the wiring module 120. As shown in Fig. 8 , a land portion 41A is formed on the main body 43. An extension portion 138 is disposed on the land portion 41A, and the land portion 41A and a wiring material connection portion 137 are connected by soldering or the like.

[0045] In this embodiment, the connection between the bus bar 130 and the wiring 140 is formed by an extension 138 instead of the connection piece 44 of the first embodiment. This allows the wiring 140 to be connected to the wiring connection portion 137 while the wiring 140 extends in the front-to-rear direction. That is, the wiring 140 can be formed in a simple strip shape, which makes it easier to form the wiring 140. Furthermore, the extension 138 is formed from the base material 33, which makes it easier to increase its strength compared to the connection piece 44. This improves the connection reliability between the bus bar 130 and the wiring 140.

[0046] (Action and effect of embodiment 2) (2-1) In the wiring module 120 according to embodiment 2, the stacking portion 132 has an extension portion 138 that extends outward from the electrode connection portion 31 in a third direction (left-right direction) that is perpendicular to both the first direction (front-to-back direction) in which the electrode connection portions 31 are arranged and the second direction (up-down direction) in which the electrode connection portions 31 and the electrode terminals 12 face each other, and the extension portion 138 has a wiring material connection portion 137.

[0047] With this configuration, even when the wiring member 140 extends in the first direction, the wiring member 140 and the wiring member connecting portion 137 can be connected to each other.

[0048] Other Embodiments The above-described first and second embodiments can be modified as follows: The above-described first and second embodiments and the following modifications can be combined and implemented within the scope of technical compatibility.

[0049] In the first and second embodiments, the bus bars 30 and 130 are made of the first metal M1 and the second metal M2. However, the bus bars may be made of a single type of metal.

[0050] In the first and second embodiments, the plurality of base materials 33 includes the plurality of first base materials 33A and one second base material 33B. However, the number of first base materials and the number of second base materials included in the plurality of base materials may be changed as appropriate. In addition, the plurality of base materials may all be made of a single type of metal.

[0051] In the above-described first and second embodiments, the laminated portion 32, 132 and the electrode connecting portion 31 are connected by welding, but the laminated portion and the electrode connecting portion may be electrically connected by being mechanically compressed and fixed.

[0052] In the first and second embodiments, the stacked portions 32 and 132 have the main body portion 35 protruding from the overlapping portion 34 . However, the main body portion 35 may be a flat plate that is substantially flush with the overlapping portion 34 .

[0053] In the first and second embodiments, the slits 36 are formed in the laminated portions 32 and 132. However, the slits may not be provided.

[0054] In the first embodiment, the wiring member connection portion 37 is provided in the overlapping portion 34, but the wiring member connection portion may be provided in the main body portion. In the second embodiment, the extension portion 138 may extend from the main body portion 35, not just the overlapping portion 34, as long as it extends outward beyond the electrode connection portion 31 in the third direction. Furthermore, the extension portion 138 may be formed from any of the base materials 33 that form the laminate portion 33.

[0055] In the first and second embodiments, the wiring members 40 and 140 are flexible printed circuit boards. However, the wiring members may be, for example, electric wires or flexible flat cables (FFCs). The wiring members may be electrically connected to the bus bars via terminals, small metal pieces, or the like. For example, the wiring module of the present disclosure includes a wiring module 220 shown in FIG. 9 . The wiring module 220 includes a bus bar 30, wiring members 240, and terminals 250. The wiring members 240 are electric wires. The terminals 250 include a terminal body 251 welded to the bus bar 30, a core wire crimping portion 252 crimped to a core wire of the electric wire, and an insulating coating crimping portion 253 crimped to an insulating coating of the electric wire.

[0056] 10: Energy storage module 11: Energy storage element 12: Electrode terminal 20: Wiring module 30: Bus bar 31: Electrode connection portion 31A: Main body portion 31B: Extension portion 31C: Through hole 32: Laminated portion 33: Base material 33A: First base material 33B: Second base material 34: Overlapping portion 35: Main body portion 35A: Side portion 35B: Ceiling portion 36: Slit 37: Wiring member connection portion 40: Wiring member 41: Conductor portion 41A: Land portion 42: Support member 43: Main body portion 44: Connection piece 120: Wiring module 130: Bus bar 132: Laminated portion 137: Wiring member connection portion 138: Extension portion 140: Wiring member 220: Wiring module 240: Wiring material 250: Terminal 251: Terminal body 252: Core wire crimping portion 253: Insulation coating crimping portion M1: First metal M2: Second metal

Claims

1. A wiring module attached to a plurality of energy storage elements having electrode terminals, comprising: a bus bar; and wiring material, wherein the bus bar comprises an electrode connection portion connected to the electrode terminals, and a lamination portion configured by laminating a plurality of plate-shaped base materials and connecting two adjacent electrode connection portions, and the lamination portion comprises a wiring material connection portion electrically connected to the wiring material.

2. The wiring module according to claim 1, wherein the laminated portion includes an overlapping portion that overlaps with the electrode connection portion and is connected to the electrode connection portion, and the overlapping portion includes the wiring material connection portion.

3. A wiring module as described in claim 1 or claim 2, wherein the electrode connection portion is made of a first metal, the multiple substrates include at least one first substrate made of the first metal and at least one second substrate made of a second metal different from the first metal, the wiring material includes a conductor portion made of the second metal, the electrode connection portion is connected to the first substrate, and the wiring material connection portion is formed of a second substrate and connected to the conductor portion.

4. A wiring module as described in claim 1 or claim 2, wherein the laminated portion has an extension portion that extends outward from the electrode connection portions in a third direction perpendicular to both a first direction in which the electrode connection portions are arranged and a second direction in which the electrode connection portions and the electrode terminals face each other, and the extension portion has the wiring material connection portion.

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