Wiring module

Abstract

A wiring module (20) attached to a plurality of power storage elements having electrode terminals, the wiring module (20) being provided with a bus bar (30) and a protector, the protector being provided with a bus bar housing section (41) that houses the bus bar (30), the bus bar (30) being provided with: an electrode connection section (31) that is connected to the electrode terminals; a flexible section (32) that is disposed between adjacent electrode connection sections (31) and is elastically deformable; and a conductive section (33) that connects the electrode connection section (31) and the flexible section (32), the conductive section (33) being provided concavely or convexly from a placement surface (30A) disposed on the power storage element side of the bus bar (30), and the bus bar housing section (41) being provided with: a bottom wall (41B) disposed between the bus bar (30) and the power storage element and facing the placement surface (30A); and an engagement part (43) formed on the bottom wall (41B) and engaged with the conduction part (33).

Description

Technical Field

[0001] The present invention relates to a wiring module. Background Art

[0002] Conventionally, as a wiring module disposed in a battery element group formed by arranging a plurality of battery elements having electrode terminals, a wiring module described in Japanese Unexamined Patent Application Publication No. 2019-207825 (hereinafter referred to as Patent Document 1) is known. This wiring module includes: a connection bus bar connected to the electrode terminal; and an insulation protector having a connection bus bar housing portion for housing the connection bus bar. The connection bus bar housing portion has a plurality of peripheral walls disposed around the connection bus bar. A reinforcing portion is provided between a pair of opposing walls that oppose each other among the plurality of peripheral walls. The connection bus bar has a bent portion that protrudes in a direction away from the electrode terminal (upward). The reinforcing portion is disposed inside the bent portion. Thereby, the connection bus bar can be positioned in the horizontal direction with respect to the insulation protector. Prior Art Documents Patent Documents

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-207825 Summary of the Invention Problems to be Solved by the Invention

[0004] In the above structure, the connection bus bar is formed by stamping a single metal plate, but by forming the portion of the connection bus bar that is connected to the electrode and the bent portion with different members, it may be easier to elastically deform the bent portion softly compared to the above structure. Thus, in the case where the bent portion is softly formed, as described above, it may be difficult to position the connection bus bar with respect to the insulation protector due to the engagement between the bent portion and the reinforcing portion. Means for Solving the Problems

[0005] The wiring module of the present invention is assembled to a plurality of battery elements having electrode terminals, and the wiring module includes a bus bar and a protector. The protector includes a bus bar housing portion for housing the bus bar. The bus bar includes: an electrode connection portion connected to the electrode terminal; a soft portion disposed between adjacent electrode connection portions and capable of elastic deformation; and a conduction portion for conducting the electrode connection portion and the soft portion. The conduction portion is recessed or protruded from a mounting surface on the battery element side of the bus bar. The bus bar housing portion includes: a bottom wall disposed between the bus bar and the battery element and opposed to the mounting surface; and an engaging portion formed on the bottom wall and engaged with the conduction portion. Advantages of the Invention

[0006] According to the present invention, it is possible to provide a wiring module capable of positioning a bus bar having an electrode connection portion and a soft portion with respect to a protector. Description of the Drawings

[0007] Figure 1 is a schematic view of a vehicle equipped with the power storage module according to Embodiment 1. Figure 2 is a top view of the wiring module and the power storage element. Figure 3 is a perspective view from above of the bus bar. Figure 4 is a perspective view from below of the bus bar. Figure 5 is a side view of the bus bar. Figure 6 is a perspective view of the bus bar housing portion. Figure 7 is a top view of the bus bar housed in the bus bar housing portion. Figure 8 is Figure 7 a sectional view taken along line A-A of Figure 9 is Figure 7 a sectional view taken along line B-B of Figure 10 is a sectional view of the wiring module according to Embodiment 2, and is a view corresponding to Figure 8 Figure 11 is a perspective view of the bus bar housing portion according to Embodiment 2. Detailed Embodiment

[0008] [Description of Embodiments of the Present Invention] First, embodiments of the present invention will be listed and described.

[0009] (1) The wiring module of the present invention is assembled to a plurality of power storage elements having electrode terminals. The wiring module includes a bus bar and a protector. The protector includes a bus bar housing portion for housing the bus bar. The bus bar includes: an electrode connection portion connected to the electrode terminal; a flexible portion disposed between adjacent electrode connection portions and capable of elastic deformation; and a conduction portion for conducting the electrode connection portion and the flexible portion. The conduction portion is recessed or protruded from a mounting surface on the power storage element side of the bus bar. The bus bar housing portion includes: a bottom wall disposed between the bus bar and the power storage element and opposed to the mounting surface; and an engaging portion formed on the bottom wall and engaged with the conduction portion.

[0010] According to such a structure, by engaging the conduction portion recessed or protruded from the mounting surface and the engaging portion formed on the bottom wall of the bus bar housing portion, the bus bar can be positioned relative to the protector in a direction parallel to the mounting surface.

[0011] ​(2) In the wiring module described in (1), preferably, the conduction portion is recessed from the placement surface, and the engaging portion protrudes from the bottom wall.

[0012] According to such a structure, since the conduction portion recessed from the placement surface and the engaging portion protruding from the bottom wall are engaged, the bottom wall can be formed thin. Therefore, it is easy to miniaturize the bus bar housing portion in the direction orthogonal to the placement surface.

[0013] (3) In the wiring module described in (1) or (2), preferably, a gap is provided between the conduction portion and the engaging portion in the direction parallel to the placement surface.

[0014] According to such a structure, manufacturing tolerances, assembly tolerances, etc. of the bus bar, electrode terminals, and bus bar housing portion in the direction parallel to the placement surface can be absorbed. In addition, the flexible portion can elastically deform in the direction parallel to the placement surface.

[0015] (4) In the wiring module described in (3), preferably, a plurality of the conduction portions and a plurality of the engaging portions are provided for one bus bar.

[0016] According to such a structure, rotation of the bus bar within the bus bar housing portion can be suppressed.

[0017] (5) In the wiring module described in (1) or (2), preferably, one of the conduction portion and the engaging portion is press-fitted into the other.

[0018] According to such a structure, the bus bar can be fixed to the bus bar housing portion. Therefore, the bus bar can be positioned relative to the protector in the direction parallel to the placement surface and the direction orthogonal to the placement surface.

[0019] (6) In any one of the wiring modules described in (1) to (5), preferably, the conduction portion is formed by overlapping the electrode connection portion, the flexible portion, and a protection member disposed so as to sandwich the flexible portion together with the electrode connection portion.

[0020] According to such a structure, by providing the protection member, damage to the flexible portion accompanying the formation of the conduction portion can be suppressed.

[0021] [Details of Embodiments of the Present Invention] Hereinafter, embodiments of the present invention will be described. The present invention is not limited to these examples, but is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0022] <Embodiment 1> Refer to Figures 1 to 9 Embodiment 1 of the present invention will be described. As Figure 1As shown, the power storage module 10 having the wiring module 20 of the present embodiment is applicable to, for example, the power storage battery 2 mounted on the vehicle 1. The power storage battery 2 is mounted on a vehicle 1 such as an electric vehicle or a hybrid vehicle and is used as a drive source of the vehicle 1. In the following description, for a plurality of identical components, sometimes only some of the components are labeled with reference numerals, and the reference numerals of the other components are omitted.

[0023] As Figure 1 shown, the power storage battery 2 is disposed near the center of the vehicle 1. A PCU 3 (Power Control Unit) is disposed at the front of the vehicle 1. The power storage battery 2 and the PCU 3 are connected by a wiring harness 4. The power storage battery 2 and the wiring harness 4 are connected by a connector (not shown). The power storage battery 2 has a power storage module 10, and the power storage module 10 includes a plurality of power storage elements 11. Hereinafter, except Figure 1 for, the direction indicated by the arrow Z is set as the upper direction, the direction indicated by the arrow X is set as the front direction, and the direction indicated by the arrow Y is set as the left direction for description.

[0024] As Figure 2 shown, the power storage module 10 includes a plurality of power storage elements 11 arranged in a row and a wiring module 20 mounted on the upper surfaces of the plurality of power storage elements 11. The power storage element 11 has a flat rectangular parallelepiped shape in which power storage elements (not shown) are housed inside. The power storage element 11 has electrode terminals 12A and 12B for the positive electrode and the negative electrode on the upper surface.

[0025] [Wiring Module] The wiring module 20 includes: a bus bar 30 connected to the power storage element 11; a flexible substrate 21 connected to the bus bar 30; and a protector 40 that holds the bus bar 30 and the flexible substrate 21. The power storage module 10 includes a wiring module 20 connected to the electrode terminals 12A and 12B disposed on the right side of the plurality of power storage elements 11 and a wiring module 20 connected to the electrode terminals 12A and 12B disposed on the left side of the plurality of power storage elements 11, and both have the same structure. Hereinafter, regarding the structure of the bus bar housing portion 41, the structure of each component will be described based on the arrangement of each component in the wiring module 20 connected to the electrode terminals 12A and 12B disposed on the right side of the plurality of power storage elements 11.

[0026] [Flexible Substrate] The flexible substrate 21 is generally in a strip shape elongated in the front-rear direction. The flexible substrate 21 is formed by forming a plurality of voltage detection lines (not shown) on the surface of a flexible insulating sheet using printed wiring technology. The flexible substrate 21 includes a substrate main body 22, an extension portion 23 extending from the substrate main body 22, and a substrate-side connection portion 24 disposed at the end of the extension portion 23.

[0027] The substrate main body 22 is fixed to the substrate storage portion 42 of the protector 40 described later. Although not shown in detail, for example, insertion through holes are provided in the substrate main body 22, and protrusions protruding from the bottom wall 45 of the substrate storage portion 42 are inserted through the insertion through holes. The extension portion 23 is formed to be long in the front-rear direction. A notch is provided in the extension portion 23 and is configured to be telescopic. By providing the extension portion 23, the substrate-side connection portion 24 is allowed to be displaced by a predetermined dimension relative to the substrate main body 22. The substrate-side connection portion 24 is a portion connected to the metal piece 15, and one end of a voltage detection line (not shown) is disposed.

[0028] The end portions of the flexible substrate 21 in the front-rear direction are connected to a connector for a flexible substrate (not shown). Terminals are housed inside the connector. The terminals are electrically connected to the other ends (not shown) of the voltage detection lines of the flexible substrate 21.

[0029] The connector is connected to an external ECU (Electronic Control Unit), etc. The ECU is equipped with a microcomputer, components, etc., and is a known structure having functions for detecting the voltage, current, temperature, etc. of each storage battery element 11 and controlling the charging and discharging of each storage battery element 11.

[0030] [Bus bar, electrode connection portion] The bus bar 30 is connected to the electrode terminals 12A and 12B of two adjacent storage battery elements 11 in the front-rear direction. As Figure 3 shown, the bus bar 30 includes two electrode connection portions 31, a flexible portion 32 disposed between the electrode connection portions 31, and a conduction portion 33 that conducts the electrode connection portions 31 and the flexible portion 32. The electrode connection portion 31 is formed of a single metal plate and has rigidity. A through hole 31A is provided in the electrode connection portion 31, and the through hole 31A penetrates the metal plate forming the electrode connection portion 31 in the up-down direction. By inserting the protrusions provided on the electrode terminals 12A and 12B into the through holes 31A of the electrode connection portion 31, the electrode terminals 12A and 12B and the electrode connection portion 31 are positioned. The hole edge portion of the through hole 31A of the electrode connection portion 31 and the electrode terminals 12A and 12B are connected by welding or the like.

[0031] [Flexible portion] As Figure 5 shown, the flexible portion 32 is formed by laminating a plurality of metal foils. The flexible portion 32 includes a base portion 32A and a protruding portion 32B that protrudes upward from the base portion 32A in a substantially U-shaped manner in side view. The base portion 32A is disposed on the front and rear sides of the protruding portion 32B and overlaps with the electrode connection portion 31. The protruding portion 32B has flexibility and can be elastically deformed. As Figure 3As shown, a plurality of (four in the present embodiment) slits 32C are provided in the flexible portion 32, and the plurality of slits 32C penetrate through the protruding portion 32B and the end region adjacent to the protruding portion 32B in the base portion 32A. Each slit 32C extends in the front-rear direction. By providing the plurality of slits 32C, the flexible portion 32 is easily deformed in the left-right direction. By providing the flexible portion 32, manufacturing tolerances, assembly tolerances, etc. of the bus bar 30, the protector 40, and the electrode terminals 12A and 12B can be absorbed. In addition, when these components expand or contract due to temperature changes, dimensional changes caused by their respective expansions or contractions are easily allowed.

[0032] [Conductive portion, protective member] The conductive portion 33 physically and electrically connects the electrode connection portion 31 and the flexible portion 32. As Figure 9 shown, in the present embodiment, the conductive portion 33 is formed by overlapping and fastening the end portion of the electrode connection portion 31, the base portion 32A of the flexible portion 32, and the protective member 34. Any known method can be used for the fastening connection. The base portion 32A is disposed between the protective member 34 and the electrode connection portion 31 in the up-down direction. As Figure 3 shown, the protective member 34 is a rectangular metal plate having substantially the same dimensions as the base portion 32A in the front-rear direction and the left-right direction. In the present embodiment, two protective members 34 are provided for one bus bar 30, and four conductive portions 33 are provided in a row in the left-right direction for one protective member 34.

[0033] As Figure 4 shown, the lower surface of the electrode connection portion 31 is the end surface (lower side) of the power storage element 11 side of the bus bar 30, which is the mounting surface 30A. The conductive portion 33 is formed with a recess 35 that is recessed upward from the mounting surface 30A. In addition, as Figure 9 shown, the conductive portion 33 has a convex portion 36 that protrudes from the upper surface of the protective member 34. The convex portion 36 is located above the recess 35. The protruding amount of the convex portion 36 from the upper surface of the protective member 34 is smaller than the depth of the recess 35 from the mounting surface 30A at the substantially central portion of the conductive portion 33. That is, at the substantially central portion of the conductive portion 33, the end portion of the electrode connection portion 31, the base portion 32A of the flexible portion 32, and the protective member 34 that are stacked on each other are compressed.

[0034] As Figure 2 shown, the electrode terminals 12A and 12B at the front end portion or the rear end portion of the plurality of power storage elements 11 and an external device are connected by an end bus bar 37. Different from the above-mentioned bus bar 30, the end bus bar 37 does not have a flexible portion 32 or a conductive portion 33 and is composed of a single metal plate. The end bus bar 37 is fixed to the front-rear end portion of the protector 40.

[0035] [Protector] The protector 40 is made of insulating synthetic resin. The protector 40 includes a bus bar housing portion 41 for housing the bus bar 30 and a substrate housing portion 42 for housing the flexible substrate 21. The bus bar housing portion 41 is in a frame shape and is arranged in the front-rear direction.

[0036] [Bus bar housing portion, engaging portion] Hereinafter, regarding the structure of the bus bar housing portion 41, as Figures 6 to 9 shown, based on the arrangement of each component in the wiring module 20 disposed on the right side of the plurality of storage elements 11, the structure of each component will be described. As Figure 6 shown, the bus bar housing portion 41 includes a peripheral wall 41A and a bottom wall 41B that extends horizontally from the lower end portion of the peripheral wall 41A toward the inner surface of the peripheral wall 41A. A notch portion 41C is provided in a portion of the peripheral wall 41A that extends in the front-rear direction. In the present embodiment, the bottom wall 41B extends in the left-right direction from the central portion in the front-rear direction of the peripheral wall 41A, and two are provided. That is, the bus bar housing portion 41 includes a pair of left and right bottom walls 41B. On each bottom wall 41B, two engaging portions 43 are formed to protrude upward from the bottom wall 41B.

[0037] As Figure 7 shown, the bus bar 30 is housed inside the peripheral wall 41A of the bus bar housing portion 41. As Figure 8 and Figure 9 shown, in a state where the bus bar 30 is disposed in the bus bar housing portion 41, the placement surface 30A of the bus bar 30 is disposed opposite to the bottom wall 41B. The engaging portions 43 are respectively disposed in the concave portions 35 of the conduction portions 33 and are engaged with the inner walls of the concave portions 35. Specifically, the four engaging portions 43 of the bus bar housing portion 41 are respectively engaged with two conduction portions 33 disposed on the front side and two conduction portions 33 disposed on the rear side among the eight conduction portions 33.

[0038] A gap CL1 is provided in the horizontal direction between the engaging portion 43 and the concave portion 35. Thereby, manufacturing tolerances, assembly tolerances, etc. of the bus bar 30, the protector 40, and the electrode terminals 12A and 12B can be absorbed. In addition, when these components expand or contract due to temperature changes, it is easy to allow dimensional changes caused by their respective expansions or contractions.

[0039] Although not shown, a locking portion for locking the bus bar 30 from above may be provided on the peripheral wall 41A of the bus bar housing portion 41. For example, an elastic piece that can be elastically deformed in the horizontal direction with respect to the peripheral wall 41A can be provided, and the end portion of the elastic piece can be used as the locking portion.

[0040] As Figure 2As shown, the substrate storage portion 42 extends in the front-rear direction and is formed in a groove shape. The substrate storage portion 42 includes a pair of left and right side walls 44 and a bottom wall 45 that connects the lower end portions of the pair of side walls 44. A notch portion 44A is provided at a position on the side wall 44 of the pair of side walls 44 that is closer to the bus bar storage portion 41 and corresponds to the notch portion 41C of the bus bar storage portion 41.

[0041] Metal pieces 15 are arranged in the notch portions 41C and 44A. The metal pieces 15 are used for electrically connecting the bus bar 30 and the voltage detection lines of the flexible substrate 21. One end of the metal piece 15 is electrically connected to the substrate-side connection portion 24, and the other end of the metal piece 15 is electrically connected to the bus bar 30. The connection between the metal piece 15 and the substrate-side connection portion 24 is performed by, for example, soldering. The connection between the metal piece 15 and the bus bar 30 is performed by, for example, welding.

[0042] [Effects of Embodiment 1] According to Embodiment 1, the following effects are achieved. The wiring module 20 of Embodiment 1 is assembled to a plurality of power storage elements 11 having electrode terminals 12A and 12B. The wiring module 20 includes a bus bar 30 and a protector 40. The protector 40 includes a bus bar storage portion 41 that houses the bus bar 30. The bus bar 30 includes: an electrode connection portion 31 that is connected to the electrode terminals 12A and 12B; a flexible portion 32 that is disposed between adjacent electrode connection portions 31 and can be elastically deformed; and a conduction portion 33 that conducts the electrode connection portion 31 and the flexible portion 32. The conduction portion 33 is recessed or protruded from the mounting surface 30A on the power storage element 11 side of the bus bar 30. The bus bar storage portion 41 includes: a bottom wall 41B that is disposed between the bus bar 30 and the power storage element 11 and faces the mounting surface 30A; and an engaging portion 43 that is formed on the bottom wall 41B and engages with the conduction portion 33.

[0043] According to such a structure, by engaging the conduction portion 33 that is recessed or protruded from the mounting surface 30A and the engaging portion 43 formed on the bottom wall 41B of the bus bar storage portion 41, the bus bar 30 can be positioned relative to the protector 40 in the direction parallel to the mounting surface 30A.

[0044] In Embodiment 1, the conduction portion 33 is recessed from the mounting surface 30A, and the engaging portion 43 protrudes from the bottom wall 41B.

[0045] According to such a structure, since the conduction portion 33 that is recessed from the mounting surface 30A and the engaging portion 43 that protrudes from the bottom wall 41B are engaged, the bottom wall 41B can be formed thin. Therefore, it is easy to miniaturize the bus bar storage portion 41 in the direction orthogonal to the mounting surface 30A.

[0046] In Embodiment 1, a gap CL1 is provided in the direction parallel to the mounting surface 30A between the conduction portion 33 and the engaging portion 43.

[0047] According to such a structure, manufacturing tolerances, assembly tolerances, etc. of the bus bar 30, the electrode terminals 12A and 12B, and the bus bar housing portion 41 in the direction parallel to the mounting surface 30A can be absorbed. In addition, the flexible portion 32 can be elastically deformed in the direction parallel to the mounting surface 30A.

[0048] In Embodiment 1, a plurality of conduction portions 33 and a plurality of engaging portions 43 are provided for one bus bar 30.

[0049] According to such a structure, rotation of the bus bar 30 within the bus bar housing portion 41 can be suppressed.

[0050] In Embodiment 1, the conduction portion 33 is formed by overlapping the electrode connection portion 31, the flexible portion 32, and the protection member 34 disposed with the electrode connection portion 31 sandwiching the flexible portion 32 therebetween.

[0051] According to such a structure, by providing the protection member 34, damage to the flexible portion 32 accompanying the formation of the conduction portion 33 can be suppressed.

[0052] <Embodiment 2> Refer to Figure 10 and Figure 11 Embodiment 2 of the present invention will be described. The wiring module 120 according to Embodiment 2 is configured in the same manner as Embodiment 1 except for the number, size, etc. of the engaging portions 143, and thus description of the same components and effects as those in Embodiment 1 is omitted. In addition, regarding a plurality of identical components, sometimes only some of the components are labeled with reference numerals, and the reference numerals of other components are omitted.

[0053] As Figure 11 shown, one engaging portion 143 is formed on each of the pair of bottom walls 41B of the bus bar housing portion 141. That is, two engaging portions 143 are provided for one bus bar housing portion 141. These two engaging portions 143 are disposed at positions closer to one side in the front-rear direction. The outer diameter of the engaging portion 143 is larger than the inner diameter of the concave portion 35. Therefore, in the present embodiment, the engaging portion 143 is press-fitted into the concave portion 35 (refer to Figure 10 ). That is, in the present embodiment, the clearance CL1 of Embodiment 1 is not provided.

[0054] In addition, in the present embodiment, the two engaging portions 143 are press-fitted into the concave portion 35 of the conduction portion 33 that connects the electrode connection portion 31 (the front-side electrode connection portion 31 in the present embodiment) of one of the two electrode connection portions 31 of the bus bar 30 and the base portion 32A. Therefore, one of the two electrode connection portions 31 of the bus bar 30 is fixed to the bus bar housing portion 141. Accordingly, elastic deformation of the flexible portion 32 in the front-rear direction, left-right direction, and up-down direction is allowed. That is, relative to one of the two electrode connection portions 31 of the bus bar 30, the other electrode connection portion 31 can be displaced in the front-rear direction, left-right direction, and up-down direction.

[0055] In the present embodiment, since the electrode connection portion 31 is fixed to the bus bar housing portion 141, even if a locking portion that locks the bus bar 30 from above is not provided in the bus bar housing portion 141, upward movement of the bus bar 30 relative to the bus bar housing portion 141 can be restricted.

[0056] [Advantages and effects of Embodiment 2] According to Embodiment 2, the following advantages and effects are achieved. In Embodiment 2, the engaging portion 143 is press-fitted into the conduction portion 33.

[0057] According to such a structure, the bus bar 30 can be fixed to the bus bar housing portion 141. Therefore, the bus bar 30 can be positioned relative to the protector 40 in the direction parallel to the mounting surface 30A and in the direction orthogonal to the mounting surface 30A.

[0058] [Other Embodiments] (1) In the above-described Embodiments 1 and 2, the conduction portion 33 is recessed from the mounting surface 30A, and the engaging portions 43 and 143 project from the bottom wall 41B, but this is not limiting. The conduction portion may be convex from the mounting surface, and the engaging portion may be formed by recessing from the bottom wall. Further, in this case, the engaging portion may also be the inner wall of a hole formed by penetrating the bottom wall. (2) In the above-described Embodiment 1, eight conduction portions 33 are provided for one bus bar 30, and four engaging portions 43 are provided for one bus bar housing portion 41, but this is not limiting. The number of conduction portions for each bus bar, the number of engaging portions for each bus bar housing portion, and the positional relationship between the conduction portion and the engaging portion may be appropriately changed. As in the above-described Embodiment 2, when the engaging portion 143 is press-fitted into the concave portion 35 of the conduction portion 33, the press-fitting structure of the conduction portion and the engaging portion is preferably arranged at a position close to one of the two electrode connection portions of the bus bar.

[0059] (3) In the above-described Embodiments 1 and 2, the bus bar 30 has two electrode connection portions 31 and one flexible portion 32, but it is not limited thereto. For example, when the bus bar connects the power storage elements in parallel, n may be set as an integer of 3 or more, and the bus bar may have n electrode connection portions and (n - 1) flexible portions. (4) In the above-described Embodiments 1 and 2, the flexible portion 32 is formed by laminating a plurality of metal foils and has a slit 32C extending in the front-rear direction. However, as long as the flexible portion is configured to be elastically deformable, its form is not limited. For example, the flexible portion may not have a slit. In addition, the flexible portion may be formed of an electric wire or the like.

[0060] (5) In the above-described Embodiments 1 and 2, the flexible substrate 21 is used as the voltage detection line, but it is not limited thereto. For example, as the voltage detection line, an electric wire or both an electric wire and a flexible substrate may be used. (6) In the above-described Embodiments 1 and 2, the bus bar 30 and the flexible substrate 21 are electrically connected via the metal piece 15, but it is not limited thereto. The bus bar and the flexible substrate may also be directly connected by welding, soldering, or the like. Description of Reference Numerals

[0061] 1: Vehicle 2: Power storage bank 3: PCU 4: Wiring harness 10: Power storage module 11: Power storage element 12A, 12B: Electrode terminals 15: Metal piece 20: Wiring module 21: Flexible substrate 22: Substrate main body 23: Extension portion 24: Substrate side connection portion 30: Bus bar 30A: Mounting surface 31: Electrode connection portion 31A: Through hole 32: Flexible portion 32A: Base portion 32B: Protrusion 32C: Slit 33: Conductive portion 34: Protection member 35: Recess 36: Protrusion 37: End bus bar 40: Protector 41, 141: Bus bar housing portion 41A: Peripheral wall 41B: Bottom wall 41C: Notch portion 42: Substrate storage portion 43, 143: Engaging portion 44: Side wall 44A: Notch portion 45: Bottom wall 120: Wiring module CL1: Gap

Claims

1. A wiring module is assembled to a plurality of power storage elements having electrode terminals, and the wiring module includes: a bus bar and a protector, the protector having a bus bar housing portion for housing the bus bar, wherein, the bus bar includes: an electrode connection portion connected to the electrode terminal; a flexible portion disposed between adjacent electrode connection portions and capable of elastic deformation; and a conduction portion for conducting the electrode connection portion and the flexible portion, the conduction portion is recessed or protruded from a mounting surface on the power storage element side of the bus bar, the bus bar housing portion includes: a bottom wall disposed between the bus bar and the power storage element and opposed to the mounting surface; and an engaging portion formed on the bottom wall and engaged with the conduction portion.

2. The wiring module according to claim 1, wherein, the conduction portion is recessed from the mounting surface, the engaging portion protrudes from the bottom wall.

3. The wiring module according to claim 1 or claim 2, wherein A gap is provided in a direction parallel to the mounting surface between the conduction portion and the engaging portion.

4. The wiring module according to claim 3, wherein, A plurality of the conduction portions and a plurality of the engaging portions are provided for one bus bar.

5. The wiring module according to claim 1 or claim 2, wherein One of the conduction portion and the engaging portion is press-fitted into the other.

6. The wiring module according to claim 1 or claim 2, wherein The conduction portion is formed by overlapping the electrode connection portion, the flexible portion, and a protection member disposed to sandwich the flexible portion together with the electrode connection portion.

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