Bus bar and wiring module

Abstract

To insulate bus bars, the bus bar and a member adjacent to the bus bar, or the members adjacent to the bus bar in a space-saving manner.SOLUTION: A bus bar 30 comprises a conductor part 31, and an insulation part 32 that is arranged at a width-direction end of the conductor part 31. The insulation part 32 extends in a direction crossing a width direction with respect to the width-direction end of the conductor part 31.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a bus bar and a wiring module. [Background technology]

[0002] High-voltage battery packs used in electric vehicles, hybrid vehicles, and the like typically have a large number of stacked battery cells electrically connected in series or parallel by a wiring module. A conventional wiring module of this type is described in Japanese Patent Laid-Open Publication No. 2019-169430 (Patent Document 1 below). The connection module described in Patent Document 1 includes electric wires, bus bars connected to electrode terminals of energy storage elements, and an insulating protector that holds the electric wires and bus bars. The insulating protector includes a bus bar holding portion that holds the bus bars. The bus bar holding portion has insulating walls that insulate the bus bars from each other and is formed in a bottomless frame shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-169430 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, in order to improve the energy density of battery packs, the electrode terminals of the energy storage elements are sometimes arranged at narrow pitches. In such cases, it may be difficult to provide an insulating wall of the busbar holding portion in the insulating protector, as in the above configuration, for insulating between the busbars, between the busbars and the electrode terminals, or between the electrode terminals.

[0005] The present disclosure was completed in light of the above circumstances, and an object of the present disclosure is to insulate bus bars from one another or from components adjacent to bus bars, or from components adjacent to bus bars, in a space-saving manner. [Means for solving the problem]

[0006] The busbar of the present disclosure includes a conductor portion and an insulating portion disposed at a widthwise end of the conductor portion, the insulating portion extending in a direction intersecting the width direction relative to the widthwise end of the conductor portion.

[0007] The wiring module of the present disclosure is a wiring module attached to a plurality of energy storage elements arranged side by side in a first direction and having electrode terminals, and includes the above-mentioned plurality of bus bars and a protector having one opening formed therein, the plurality of bus bars are arranged side by side in the first direction facing the one opening, the conductor portion of each of the bus bars is connected to the electrode terminal, and the insulating portion of each of the bus bars separates the electrode terminal to which the conductor portion of each of the bus bars is connected from the electrode terminal to which the conductor portion of each of the bus bars is not connected. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to insulate bus bars from each other, or from components adjacent to bus bars, or from components adjacent to bus bars, in a space-saving manner. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view of the electricity storage module according to the first embodiment. [Figure 2] FIG. 2 is a perspective view of the electricity storage module according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 4 is a perspective view of a plurality of energy storage elements. [Figure 5] FIG. 5 is a perspective view of the bus bar according to the first embodiment. [Figure 6] FIG. 6 is a perspective view of a bus bar according to the second embodiment. [Figure 7]FIG. 7 is a cross-sectional view of the electricity storage module according to the second embodiment, and corresponds to FIG. 3 of the first embodiment. [Figure 8] FIG. 8 is a perspective view of a bus bar according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. [1] The busbar of the present disclosure includes a conductor portion and an insulating portion disposed at a widthwise end of the conductor portion, and the insulating portion extends in a direction intersecting the widthwise end of the conductor portion.

[0011] With this configuration, when a plurality of bus bars are arranged side by side in the width direction, an insulating portion can be disposed between adjacent conductor portions, thereby enabling insulation between adjacent bus bars in a space-saving manner.

[0012] [2] In the above item [1], it is preferable that the insulating portion is disposed at both ends of the conductor portion in the width direction.

[0013] With this configuration, when multiple bus bars are arranged side by side in the width direction, two insulating portions can be arranged between adjacent conductor portions. Therefore, the two insulating portions can insulate the adjacent bus bars from each other. This makes it easier to insulate the bus bars from each other than when a single insulating portion is used to insulate the bus bars from each other.

[0014] [3] In the above [1] or [2], the conductor portion preferably has a protrusion.

[0015] With this configuration, when a plurality of components (for example, electrode terminals) are connected via the bus bar, the elastic deformation of the convex portion can absorb the tolerance of the spacing between the plurality of components.

[0016] [4] The wiring module of the present disclosure is a wiring module attached to a plurality of energy storage elements arranged side by side in a first direction and having electrode terminals, and includes a plurality of bus bars according to any one of [1] to [3] above, and a protector having one opening formed therein, wherein the plurality of bus bars are arranged side by side in the first direction facing the one opening, the conductor portion of each of the bus bars is connected to the electrode terminal, and the insulating portion of each of the bus bars separates the electrode terminal to which the conductor portion of each of the bus bars is connected from the electrode terminal to which the conductor portion of each of the bus bars is not connected.

[0017] With this configuration, the insulating portion can provide insulation between adjacent bus bars, between a bus bar and an electrode terminal, or between electrode terminals in a space-saving manner.

[0018] [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 sake of convenience, some components may be exaggerated or simplified. Furthermore, the dimensional ratios of the components may differ between drawings. In this specification, "orthogonal" and "parallel" do not only refer to strictly orthogonal or parallel, but also include roughly orthogonal or parallel within the scope of the operation and effect of this embodiment.

[0019] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. An energy storage module 1 including a wiring module 10 of 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 rightward. In this embodiment, the left-right direction is an example of the width direction and an example of the first direction. Note that, for multiple identical components, only some of the components may be designated by reference numerals, and the reference numerals for the other components may be omitted.

[0020] 1 and 2, the energy storage module 1 includes a plurality of energy storage elements 2 and a wiring module 10. The plurality of energy storage elements 2 are arranged in a line in the left-right direction.

[0021] As shown in FIG. 4 , each energy storage element 2 includes a main body 3 and two electrode terminals 4 protruding from the main body 3. One of the two electrode terminals 4 protrudes upward, and the other of the two electrode terminals 4 protrudes downward. The electrode terminals 4 are plate-shaped. In this embodiment, the electrode terminals 4, excluding the total positive and negative electrodes, are bent in the direction in which the energy storage elements 2 are arranged. Here, for example, the total positive electrode is the electrode terminal 4 arranged on the upper side of the energy storage element 2 arranged on the right end. The total negative electrode is the electrode terminal 4 arranged on the lower side of the energy storage element 2 arranged on the left end. The electrode terminals 4 (excluding the total positive electrode) arranged on the upper side of the energy storage element 2 include a first portion 4A extending in the vertical direction and a second portion 4B bent from the first portion 4A and extending in the horizontal direction. The electrode terminals 4 (excluding the total negative electrode) arranged on the lower side of the energy storage element 2 are configured similarly to the electrode terminals 4 (excluding the total positive electrode) arranged on the upper side of the energy storage element 2.

[0022] The energy storage module 1 may be provided with a pair of end plates 5 that sandwich the plurality of energy storage elements 2 from both sides. Also, spacers may be provided between adjacent energy storage elements 2.

[0023] 3, the second portion 4B is a portion that overlaps and is electrically connected to the bus bar 30. The second portion 4B of the electrode terminal 4 may extend outward in the left-right direction beyond the main body 3. With this configuration, a large area can be ensured for the second portion 4B, thereby improving the electrical connection between the bus bar 30 and the electrode terminal 4.

[0024] (Wiring module 10) 1 and 2, the energy storage module 1 includes wiring modules 10 attached to the upper and lower sides of the plurality of energy storage elements 2. The wiring module 10 attached to the upper sides of the plurality of energy storage elements 2 and the wiring module 10 (not shown) attached to the lower sides of the plurality of energy storage elements 2 have substantially the same configuration, and therefore, hereinafter, only the wiring module 10 attached to the upper sides of the plurality of energy storage elements 2 will be described. The wiring module 10 includes a plurality of bus bars 30, a plurality of electric wires 11, and a protector 20.

[0025] The plurality of electric wires 11 are held by a protector 20. One end of each electric wire 11 is electrically connected to a bus bar 30 by, for example, soldering or the like. Furthermore, one end of each electric wire 11 is connected to a terminal, and the terminal may be electrically connected to the bus bar 30 by, for example, welding or the like. The other end of each electric wire 11 is connected to an external device, for example, via a connector. The external device is a device provided outside the energy storage module 1. The external device is, for example, an ECU (Electronic Control Unit). 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 energy storage element 2, and for controlling the charging and discharging of each energy storage element 2, etc.

[0026] (Protector 20) The protector 20 is made of insulating synthetic resin. The protector 20 is frame-shaped with one opening 21. The opening 21 penetrates the protector 20 in the up-down direction. The protector 20 has two frame portions 22A and 22B extending in the left-right direction and two frame portions 22C and 22D extending in the front-rear direction. The frame portion 22A is the front portion of the protector 20, and the frame portion 22B is the rear portion of the protector 20. The frame portion 22C is the right portion of the protector 20, and the frame portion 22D is the left portion of the protector 20. The opening 21 is substantially rectangular in plan view.

[0027] The upper electrode terminals 4 of the plurality of energy storage elements 2 are arranged inside opening 21. The electrode terminals 4 connected to busbar 30 are covered from above by busbar 30 (see FIG. 3). The plurality of busbars 30 are arranged side by side in the left-right direction on protector 20. The plurality of busbars 30 are collectively surrounded by frame portions 22A to 22D. The plurality of busbars 30 face opening 21. In other words, each of the plurality of busbars 30 has a portion that overlaps opening 21 in the up-down direction. Protector 20 does not have a member that separates the busbars 30 in the left-right direction.

[0028] The frame portions 22B, 22C, and 22D are generally block-shaped. The frame portion 22A is provided with a routing recess 23 in which a plurality of electric wires 11 are routed. The routing recess 23 is groove-shaped. The routing recess 23 includes a bottom wall 23A, a first side wall 23B extending upward from the rear end of the bottom wall 23A, and a second side wall 23C extending upward from the front end of the bottom wall 23A. The first side wall 23B is formed with a notch 23B1 that connects the opening 21 with the internal space of the routing recess 23. One end of the electric wire 11 is drawn into the opening 21 through the notch 23B1, and the one end of the electric wire 11 is connected to the bus bar 30 disposed in the opening 21. The routing recess 23 may include a claw 23D extending from the first side wall 23B or the second side wall 23C. The claw portion 23D has a function of locking the electric wire 11 from above and preventing the electric wire 11 from jumping out of the wiring recess 23.

[0029] The protector 20 includes a holding portion that holds the bus bar 30. As shown in FIGS. 1 and 3 , in this embodiment, the protector 20 includes a support portion 24 and a locking portion 25A as examples of a holding portion. The support portion 24 extends from the frame portions 22A and 22B toward the inside of the opening 21. The support portion 24 contacts the bus bar 30 from below, thereby restricting downward movement of the bus bar 30. As shown in FIGS. 2 and 3 , the frame portions 22A and 22B include locking pieces 25 that are elastically deformable in the front-rear direction and elastic deformation spaces 26 that allow elastic deformation of the locking pieces 25. The locking portions 25A are provided at the tips of the locking pieces 25 and protrude toward the inside of the opening 21. The locking portions 25A are disposed higher than the support portions 24. As shown in FIG. 3 , the distance between the support portion 24 and the locking portions 25A in the up-down direction is set to be equal to or greater than the thickness of the conductor portions 31 of the bus bar 30. Locking portion 25A contacts bus bar 30 from above, thereby restricting upward movement of bus bar 30. Therefore, bus bar 30 is sandwiched in the vertical direction between support portion 24 and locking portion 25A, and bus bar 30 is prevented from coming out of protector 20.

[0030] To attach bus bar 30 to protector 20, bus bar 30 is pressed from above opening 21 of protector 20. As a result, bus bar 30 comes into sliding contact with locking portion 25A, and locking piece 25 elastically deforms into elastic deformation space 26. When bus bar 30 moves over locking portion 25A, locking piece 25 undergoes restoration deformation, and locking portion 25A is positioned above bus bar 30. In this way, bus bar 30 is held between support portion 24 and locking portion 25A.

[0031] (Busbar 30) 3 and 5, the bus bar 30 includes a conductor portion 31 and an insulating portion 32 disposed at an end portion in the width direction (left-right direction) of the conductor portion 31. The conductor portion 31 is made of a conductive metal such as copper, a copper alloy, aluminum, or an aluminum alloy. The conductor portion 31 has a plate shape. The conductor portion 31 is formed, for example, by processing a metal plate material.

[0032] Conductor portion 31 may be formed of, for example, a laminated body made up of multiple metal foils. Such a configuration can increase the flexibility of bus bar 30. Therefore, bus bar 30 can absorb the tolerances of electrode terminals 4 and absorb stress due to thermal expansion and contraction of energy storage elements 2.

[0033] The conductor 31 of this embodiment includes a base wall 31A and a protrusion 31B protruding upward from the base wall 31A. As shown in FIG. 3 , the base wall 31A extends parallel to the second portion 4B of the electrode terminal 4. In other words, the thickness direction of the base wall 31A is the up-down direction. The base wall 31A includes an electrode connection portion electrically connected to the second portion 4B by welding or the like. In this embodiment, the busbar 30 includes two electrode connection portions. The base wall 31A includes ends of the conductor 31 in the width direction. The protrusion 31B includes a pair of side portions 31B1 extending upward from the base wall 31A and a connecting portion 31B2 connecting the upper ends of the pair of side portions 31B1. The protrusion 31B is formed by bending a laminate of metal sheets or metal foils that constitutes the conductor 31. The protrusion 31B is configured to be elastically deformable. This allows misalignment in the left-right or up-down direction between the two electrode connection portions of bus bar 30. Therefore, by providing protrusion 31B, it is possible to absorb tolerances of electrode terminal 4 and stress due to thermal expansion / contraction of energy storage element 2.

[0034] The insulating portion 32 has the function of preventing electrical conduction between any conductor and the conductor portion 31 when the conductor comes into contact with the insulating portion 32. Therefore, at least the surface of the insulating portion 32 is insulated. The insulating portion 32 of this embodiment includes an extension portion 33 extending from the conductor portion 31 and a covering portion 34 covering the extension portion 33. The extension portion 33 is provided integrally with the conductor portion 31. That is, the extension portion 33 is formed by folding the metal plate material or metal foil laminate that constitutes the conductor portion 31. The covering portion 34 is made of an insulating material. The covering portion 34 is, for example, an insulating resin, a heat-shrinkable tube, an insulating coating, an insulating plating, or the like.

[0035] The insulating portion 32 extends in a direction intersecting the width direction relative to the widthwise end of the conductor portion 31. In this embodiment, the insulating portion 32 extends downward from the base wall portion 31A. More specifically, as shown in Fig. 5, the insulating portion 32 includes a partition portion 32A extending in the up-down direction and a bent portion 32B having a bent shape and connecting the partition portion 32A and the conductor portion 31.

[0036] 3 , the multiple bus bars 30 are arranged in a line in the opening 21 in the direction in which the energy storage elements 2 are lined up. The width direction of the conductor portion 31 of each bus bar 30 coincides with the direction in which the energy storage elements 2 are lined up. When the multiple bus bars 30 are arranged in this manner, the insulating portions 32 of each bus bar 30 prevent electrical conduction between the conductor portion 31 of each bus bar 30 and other bus bars 30 adjacent to each bus bar 30.

[0037] When attaching the wiring module 10 to the plurality of energy storage elements 2, for example, a jig is used to position each bus bar 30 and the electrode terminals 4 of the plurality of energy storage elements 2 in the left-right direction. As a result, the conductor portion 31 of each bus bar 30 is arranged to overlap the second portions 4B of the two electrode terminals 4 in the up-down direction. The protector 20 is positioned relative to the end plate 5, for example.

[0038] The conductor portion 31 (electrode connection portion) of each bus bar 30 is connected to the second portions 4B of the two electrode terminals 4 by welding or the like. The insulating portion 32 of each bus bar 30 separates the electrode terminal 4 to which the conductor portion 31 of each bus bar 30 is connected from the electrode terminal 4 to which the conductor portion 31 of each bus bar 30 is not connected. This prevents electrical conduction between the conductor portion 31 of each bus bar 30 and the electrode terminal 4 adjacent to each bus bar 30 but not connected to each bus bar 30.

[0039] In this embodiment, the insulating portions 32 are disposed at both ends of the conductor portion 31, so that two insulating portions 32 are disposed between the conductor portion 31 of each busbar 30 and the conductor portion 31 of another busbar 30 adjacent to that busbar 30. On the other hand, unlike this embodiment, if insulating portions are disposed at only one end of the conductor portion in the width direction, one insulating portion is disposed between the conductor portion of each busbar and the conductor portion of another busbar adjacent to that busbar (see Embodiment 2). Therefore, the configuration of this embodiment makes it even easier to prevent electrical conduction between each busbar 30 and the other busbar 30 adjacent to that busbar 30. Furthermore, since the insulating portions 32 are provided at both ends of the conductor portion 31 in the width direction, the busbars 30 have a symmetrical shape, which facilitates the arrangement of multiple busbars 30 in the protector 20.

[0040] In this embodiment, it is preferable that the tip (lower end) of the insulating portion 32 (partition portion 32A) extends to the vicinity of the main body portion 3 of the energy storage element 2. With this configuration, it is possible to further prevent the electrode terminals 4 connected to each bus bar 30 from coming into contact with other adjacent bus bars 30 or electrode terminals 4.

[0041] (Effects of the first embodiment) (1) The busbar 30 according to the first embodiment includes a conductor portion 31 and an insulating portion 32 disposed at the widthwise (left-right) end of the conductor portion 31, and the insulating portion 32 extends in a direction intersecting the widthwise end of the conductor portion 31.

[0042] With this configuration, when multiple bus bars 30 are arranged side by side in the width direction, insulating portions 32 can be arranged between adjacent conductor portions 31. Therefore, adjacent bus bars 30 can be insulated from each other in a space-saving manner.

[0043] (2) In the first embodiment, the insulating portions 32 are disposed at both ends of the conductor portion 31 in the width direction.

[0044] With this configuration, when multiple bus bars 30 are arranged side by side in the width direction, two insulating portions 32 can be arranged between adjacent conductor portions 31. Therefore, the two insulating portions 32 can insulate the adjacent bus bars 30 from each other. Therefore, it is easier to insulate the bus bars 30 from each other than when the bus bars are insulated from each other by a single insulating portion.

[0045] (3) In the first embodiment, the conductor portion 31 has the protrusion 31B.

[0046] With this configuration, when a plurality of members (eg, electrode terminals 4) are connected via bus bar 30, the elastic deformation of protrusion 31B can absorb the tolerance of the spacing between the plurality of members.

[0047] (4) The wiring module 10 of embodiment 1 is a wiring module 10 that is attached to a plurality of storage elements 2 that are arranged side by side in a first direction (left-right direction) having electrode terminals 4, and includes a plurality of bus bars 30 and a protector 20 that has one opening 21 formed therein. The plurality of bus bars 30 are arranged side by side in the first direction facing the one opening 21, the conductor portion 31 of each bus bar 30 is connected to the electrode terminal 4, and the insulating portion 32 of each bus bar 30 separates the electrode terminal 4 to which the conductor portion 31 of each bus bar 30 is connected from the electrode terminal 4 to which the conductor portion 31 of each bus bar 30 is not connected.

[0048] With this configuration, the insulating portions 32 can provide insulation between adjacent bus bars 30, between bus bars 30 and electrode terminals 4, or between members adjacent to the bus bars 30 (for example, between electrode terminals 4) in a space-saving manner.

[0049] <Embodiment 2> A second embodiment of the present disclosure will be described with reference to Figures 6 and 7. Hereinafter, the same components as those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and detailed description thereof may be omitted.

[0050] 6, a bus bar 130 according to the second embodiment includes a conductor portion 31 and an insulating portion 32 disposed only at one end in the width direction of the conductor portion 31. No insulating portion 32 is provided at the other end in the width direction of the conductor portion 31.

[0051] FIG. 7 corresponds to FIG. 3 of the first embodiment and is a cross-sectional view of a wiring module 110 of the second embodiment. The wiring module 110 of the second embodiment has the same configuration as the first embodiment, except for the plurality of bus bars 130. In the wiring module 110, each bus bar 130 is disposed on the protector 20 such that the insulating portion 32 is disposed on one side (the right side) in the direction in which the energy storage devices 2 are arranged, and the other end of the conductor portion 31 is disposed on the other side (the left side) in the direction in which the energy storage devices 2 are arranged. The insulating portion 32 of each bus bar 130 is adjacent to the other end of the conductor portion 31 of the other bus bar 130. In other words, one insulating portion 32 is interposed between the conductor portions 31 of two adjacent bus bars 130. This prevents the plurality of bus bars 130 from becoming electrically conductive.

[0052] Furthermore, the insulating portion 32 of each bus bar 130 separates the electrode terminal 4 to which the conductor portion 31 of each bus bar 130 is connected from the electrode terminal 4 to which the conductor portion 31 of each bus bar 130 is not connected. This prevents electrical conduction between the conductor portion 31 of each bus bar 130 and the electrode terminal 4 adjacent to each bus bar 130 but not connected to each bus bar 130.

[0053] According to the configuration of embodiment 2, the bus bar 130 is provided with only one insulating portion 32, which reduces the manufacturing costs of the bus bar 130 compared to embodiment 1. Furthermore, because only one insulating portion 32 is disposed between two adjacent conductor portions 31, this configuration can be easily adopted even when the spacing between the electrode terminals 4 is narrow, making it easy to reduce the size of the wiring module 110 in the left-right direction.

[0054] <Embodiment 3> A third embodiment of the present disclosure will be described with reference to Fig. 8. Hereinafter, the same members as those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and detailed description thereof may be omitted.

[0055] Busbar 230 according to the third embodiment includes flat conductor portion 231 and insulating portions 32 disposed at both widthwise ends of conductor portion 231. In this manner, busbar 230 does not need to be formed with protrusions 31B as in the first embodiment.

[0056] (Other embodiments) The above-described first to third embodiments can be modified as follows: The above-described first to third embodiments and the following modifications can be combined with each other within the scope of technical compatibility.

[0057] In the first embodiment, the wiring module 10 includes the electric wires 11 electrically connected to the bus bars 30. However, the wiring module may include a circuit board instead of the electric wires.

[0058] In the first embodiment, the convex portion 31B is substantially rectangular in front view, but the convex portion may be, for example, mountain-shaped or semicircular in front view.

[0059] In the first embodiment, the bus bar 30 is configured to be connected to two electrode terminals 4, but the number of electrode terminals connected to the bus bar may be three or more. [Explanation of symbols]

[0060] 1: Energy storage module 2: Energy storage element 3: Main body 4: Electrode terminal 4A: Part 1 4B: Second part 5: End plate 10: Wiring module 11: Electric wire 20: Protector 21: Opening 22A, 22B, 22C, 22D: Frame 23: Routing recess 23A: Bottom wall 23B: 1st side wall 23B1: Notch 23C: 2nd side wall 23D: Claw part 24: Support part 25: Locking piece 25A: Locking part 26: Elastic deformation space 30: Busbar 31: Conductor 31A: Base wall part 31B: Convex part 31B1: Side 31B2: Connection part 32: Insulation 32A: Bulkhead part 32B: Bent section 33: Extension part 34: Covering part 110: Wiring module 130: Busbar 230: Busbar 231: Conductor

Claims

1. A conductor portion; an insulating portion disposed at an end portion in a width direction of the conductor portion, The insulating portion extends in a direction intersecting the width direction with respect to an end portion of the conductor portion in the width direction.

2. The bus bar according to claim 1 , wherein the insulating portion is disposed at both end portions of the conductor portion in the width direction.

3. The bus bar according to claim 1 or 2, wherein the conductor portion has a protrusion.

4. A wiring module attached to a plurality of energy storage elements having electrode terminals and arranged side by side in a first direction, A plurality of bus bars according to claim 1 or 2; a protector having one opening formed therein; the plurality of bus bars are arranged side by side in the first direction facing the one opening, the conductor portion of each bus bar is connected to the electrode terminal; the insulating portion of each of the bus bars separates the electrode terminal to which the conductor portion of each of the bus bars is connected from the electrode terminal to which the conductor portion of each of the bus bars is not connected.

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