Bus bar for wiring module

Abstract

To provide a wiring module capable of positioning a bus bar including an electrode connection part and a flexible part with respect to a protector.SOLUTION: A wiring module (20) to be attached to a plurality of electric storage elements having electrode terminals is provided with a bus bar (30), and a protector provided with a bus bar housing section (41) for housing the bus bar (30), wherein the bus bar (30) is provided with an electrode connecting section (31) connected to the electrode terminal, a flexible section (32) arranged between the adjacent electrode connecting sections (31) and capable of elastic deformation, and a conducting section (33) for conducting the electrode connecting section (31) and the flexible section (32) to each other, the conducting section (33) is recessed or projected from a mounting surface (30A) arranged on the electric storage element side of the bus bar (30), and the bus bar housing section (41) is provided with a bottom wall (41B) arranged between the bus bar (30) and the electric storage element and facing the mounting surface (30A), and an engaging section (43) formed on the bottom wall (41B) and engaging with the conducting section (33).SELECTED DRAWING: Figure 9

Description

[Technical Field]

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

[0002] A conventional wiring module disposed in an energy storage element group in which a plurality of energy storage elements having electrode terminals are arranged is described in Japanese Patent Laid-Open Publication No. 2019-207825 (Patent Document 1 below). This wiring module includes a connection bus bar connected to the electrode terminal and an insulating protector having a connection bus bar accommodating portion that accommodates the connection bus bar. The connection bus bar accommodating portion has a plurality of peripheral walls disposed around the connection bus bar. A reinforcing portion is provided between a pair of opposing walls 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. This allows the connection bus bar to be positioned horizontally relative to the insulating protector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-207825 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above configuration, the connection bus bar is formed by pressing a single metal plate, but by forming the portion of the connection bus bar connected to the electrode and the bent portion from separate members, it may be possible to make the bent portion more flexible and more susceptible to elastic deformation than in the above configuration. If the bent portion is formed to be flexible in this way, it may become difficult to position the connection bus bar relative to the insulating protector due to the engagement between the bent portion and the reinforcing portion as described above. [Means for solving the problem]

[0005] The 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 a protector having a bus bar accommodating portion that accommodates the bus bar; the bus bar includes electrode connection portions connected to the electrode terminals, flexible portions that are arranged between adjacent electrode connection portions and are elastically deformable, and conductive portions that provide electrical continuity between the electrode connection portions and the flexible portions, the conductive portions being recessed or protruded from a mounting surface that is arranged on the energy storage element side of the bus bar; and the bus bar accommodating portion is arranged between the bus bar and the energy storage elements and includes: a bottom wall that faces the mounting surface; and an engaging portion that is formed on the bottom wall and engages with the conductive portion. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to provide a wiring module that allows positioning of a bus bar that includes an electrode connection portion and a flexible portion relative to a protector. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing a vehicle equipped with a power storage module according to a first embodiment. [Figure 2] FIG. 2 is a plan view of the wiring module and the energy storage element. [Figure 3] FIG. 3 is a top perspective view of the bus bar. [Figure 4] FIG. 4 is a bottom perspective view of the bus bar. [Figure 5] FIG. 5 is a side view of the bus bar. [Figure 6] FIG. 6 is a perspective view of the bus bar receiving portion. [Figure 7] FIG. 7 is a plan view of the bus bar accommodated in the bus bar accommodating portion. [Figure 8] FIG. 8 is a cross-sectional view taken along line AA in FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along the line BB in FIG. [Figure 10]FIG. 10 is a cross-sectional view of the wiring module according to the second embodiment, and corresponds to FIG. [Figure 11] FIG. 11 is a perspective view of a bus bar accommodating portion according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0009] (1) The 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 a protector including a bus bar accommodating portion that accommodates the bus bar. The bus bar includes electrode connection portions connected to the electrode terminals, flexible portions that are arranged between adjacent electrode connection portions and are elastically deformable, and conductive portions that provide electrical continuity between the electrode connection portions and the flexible portions. The conductive portions are recessed or protruded from a mounting surface that is arranged on the energy storage element side of the bus bar. The bus bar accommodating portion is arranged between the bus bar and the energy storage elements and includes: a bottom wall that faces the mounting surface; and an engaging portion that is formed on the bottom wall and engages with the conductive portion.

[0010] With this configuration, the conductive portion recessed or protruding from the mounting surface engages with the engaging portion formed on the bottom wall of the busbar accommodating portion, thereby allowing the busbar to be positioned relative to the protector in a direction parallel to the mounting surface.

[0011] (2) In the wiring module described in (1), it is preferable that the conductive portion is recessed from the mounting surface, and the engaging portion protrudes from the bottom wall.

[0012] With this configuration, the conductive portion recessed from the mounting surface and the engaging portion protruding from the bottom wall engage with each other, allowing the bottom wall to be made thin, which makes it easier to reduce the size of the busbar accommodating portion in the direction perpendicular to the mounting surface.

[0013] (3) In the wiring module described in (1) or (2), it is preferable that a clearance is provided between the conductive portion and the engaging portion in a direction parallel to the placement surface.

[0014] This configuration can accommodate manufacturing tolerances and assembly tolerances of the bus bars, electrode terminals, and bus bar accommodating portions in the direction parallel to the mounting surface. Also, the flexible portion can be elastically deformed in the direction parallel to the mounting surface.

[0015] (4) In the wiring module described in (3), it is preferable that a plurality of the conductive portions and a plurality of the engaging portions are provided for one bus bar.

[0016] With this configuration, it is possible to suppress rotation of the bus bar within the bus bar accommodating portion.

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

[0018] With this configuration, the bus bar can be fixed to the bus bar accommodating portion, and therefore the bus bar can be positioned relative to the protector in the direction parallel to the mounting surface and in the direction perpendicular to the mounting surface.

[0019] (6) In the wiring module described in any one of (1) to (5), it is preferable that the conductive portion is formed by overlapping the electrode connection portion, the flexible portion, and a protective member arranged together with the electrode connection portion and sandwiching the flexible portion.

[0020] According to this configuration, the provision of the protective member can suppress damage to the flexible portion that occurs when the conductive portion is formed.

[0021] [Details of the embodiments of the present disclosure] The present disclosure will be described below with reference to exemplary embodiments. The present disclosure is not limited to these examples, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0022] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to Figs. 1 to 9. An electricity storage module 10 including a wiring module 20 of the present embodiment is applied to an electricity storage pack 2 mounted on a vehicle 1, for example, as shown in Fig. 1. The electricity storage pack 2 is mounted on the vehicle 1, such as an electric vehicle or a hybrid vehicle, and is used as a drive source for the vehicle 1. In the following description, when multiple identical members are used, reference numerals may be assigned to only some of the members, and the reference numerals of the other members may be omitted.

[0023] As shown in FIG. 1, an electricity storage pack 2 is disposed near the center of a vehicle 1. A PCU 3 (Power Control Unit) is disposed in the front of the vehicle 1. The electricity storage pack 2 and the PCU 3 are connected by a wire harness 4. The electricity storage pack 2 and the wire harness 4 are connected by a connector (not shown). The electricity storage pack 2 has an electricity storage module 10 equipped with a plurality of electricity storage elements 11. In the following description, except for FIG. 1, the direction indicated by arrow Z is defined as upward, the direction indicated by arrow X is defined as forward, and the direction indicated by arrow Y is defined as leftward.

[0024] 2, 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 energy storage elements 11 are flattened rectangular parallelepipeds that house energy storage elements (not shown) inside. The energy storage elements 11 have positive and negative electrode terminals 12A, 12B on their upper surfaces.

[0025] [Wiring module] The wiring module 20 includes a bus bar 30 connected to the energy storage elements 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 energy storage module 10 is configured with a wiring module 20 connected to electrode terminals 12A, 12B arranged on the right side of the multiple energy storage elements 11, and a wiring module 20 connected to electrode terminals 12A, 12B arranged on the left side of the multiple energy storage elements 11, and both have the same configuration. Below, the configuration of each component in the bus bar accommodating portion 41 will be described based on the arrangement of each component in the wiring module 20 connected to electrode terminals 12A, 12B arranged on the right side of the multiple energy storage elements 11.

[0026] [Flexible PCB] The flexible substrate 21 has an overall elongated rectangular shape extending in the front-to-rear direction. The flexible substrate 21 is configured 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 an end of the extension portion 23.

[0027] The board main body 22 is fixed to a board accommodating portion 42 of the protector 40, which will be described later. Although not shown in detail, for example, the board main body 22 has an insertion hole through which a protrusion protruding from a bottom wall 45 of the board accommodating portion 42 is inserted. The extension portion 23 is formed long in the front-rear direction. A notch is provided in the extension portion 23, making it expandable and contractible. The extension portion 23 allows the board-side connection portion 24 to be displaced a predetermined dimension relative to the board main body 22. The board-side connection portion 24 is a portion that is connected to the small metal piece 15, and one end of a voltage detection wire (not shown) is disposed thereon.

[0028] The flexible substrate 21 is connected at its front-rear end to a connector for the flexible substrate (not shown). A terminal is housed inside the connector. This terminal is electrically connected to the other end (not shown) of the voltage detection line of the flexible substrate 21.

[0029] The connector is adapted to be connected to an external ECU (Electronic Control Unit), etc. The ECU is equipped with a microcomputer, elements, etc., and has a well-known configuration that has functions for detecting the voltage, current, temperature, etc. of each storage element 11, and for controlling the charging and discharging of each storage element 11, etc.

[0030] [Busbar, electrode connection] The bus bar 30 connects the electrode terminals 12A, 12B of two energy storage elements 11 adjacent in the front-rear direction. As shown in FIG. 3 , the bus bar 30 includes two electrode connection portions 31, a flexible portion 32 disposed between the electrode connection portions 31, and a conductive portion 33 that electrically connects the electrode connection portions 31 and the flexible portion 32. The electrode connection portions 31 are made of a single metal plate and are rigid. The electrode connection portions 31 are provided with through holes 31A that vertically penetrate the metal plate that constitutes the electrode connection portion 31. The electrode terminals 12A, 12B are positioned relative to the electrode connection portion 31 by inserting protrusions provided on the electrode terminals 12A, 12B into the through holes 31A of the electrode connection portion 31. The edge of the through holes 31A of the electrode connection portion 31 and the electrode terminals 12A, 12B are connected by welding or the like.

[0031] [Flexible part] As shown in FIG. 5, the flexible portion 32 is formed by laminating multiple 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 generally inverted U-shape in a side view. The base portion 32A is disposed on both the front and rear sides of the protruding portion 32B and overlaps the electrode connection portion 31. The protruding portion 32B is flexible and capable of elastic deformation. As shown in FIG. 3, the flexible portion 32 is provided with multiple (four in this embodiment) slits 32C that penetrate the protruding portion 32B and the end region of the base portion 32A adjacent to the protruding portion 32B. Each slit 32C extends in the front-rear direction. The provision of multiple slits 32C facilitates deformation of the flexible portion 32 in the left-right direction. The provision of the flexible portion 32 makes it possible to accommodate manufacturing tolerances, assembly tolerances, etc. of the bus bar 30, the protector 40, and the electrode terminals 12A and 12B. Furthermore, when these members expand or contract due to temperature changes, it becomes easier to tolerate the dimensional changes caused by the respective expansion and contraction.

[0032] [Conductive parts, protective materials] The conductive portion 33 physically and electrically connects the electrode connection portion 31 and the flexible portion 32. As shown in FIG. 9 , in this embodiment, the conductive portion 33 is formed by overlapping and crimping an end portion of the electrode connection portion 31, a base portion 32A of the flexible portion 32, and a protective member 34. Any known crimping method may be used for the crimping. The base portion 32A is disposed between the protective member 34 and the electrode connection portion 31 in the up-down direction. As shown in FIG. 3 , the protective member 34 is a rectangular metal plate whose dimensions in the front-rear and left-right directions are approximately the same as those of the base portion 32A. In this embodiment, two protective members 34 are provided per bus bar 30, and four conductive portions 33 are provided per protective member 34, aligned in a row in the left-right direction.

[0033] As shown in FIG. 4, the lower surface of the electrode connection portion 31 is the end surface of the bus bar 30 on the energy storage element 11 side (lower side), and serves as the mounting surface 30A. The conductive portion 33 is formed with a recess 35 recessed upward from the mounting surface 30A. Furthermore, as shown in FIG. 9, the conductive portion 33 has a protrusion 36 protruding from the upper surface of the protective member 34. The protrusion 36 is located above the recess 35. The amount of protrusion of the protrusion 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 approximately the center of the conductive portion 33. In other words, at approximately the center of the conductive portion 33, the end of the electrode connection portion 31, the base 32A of the flexible portion 32, and the protective member 34, which are stacked one on the other, are compressed.

[0034] 2, electrode terminals 12A, 12B at the front or rear ends of multiple energy storage elements 11 are connected to an external device by end bus bar 37. Unlike bus bar 30 described above, end bus bar 37 does not have flexible portion 32 or conductive portion 33 and is made of a single metal plate. End bus bar 37 is fixed to the end of protector 40 in the front-rear direction.

[0035] [Protector] Protector 40 is made of insulating synthetic resin and includes busbar accommodating portions 41 that accommodate busbars 30 and substrate accommodating portions 42 that accommodate flexible substrates 21. Busbar accommodating portions 41 are frame-shaped and are arranged side by side in the front-to-rear direction.

[0036] [Busbar accommodating section, engagement section] The configuration of each component of the busbar accommodating portion 41 will be described below based on the arrangement of each component in the wiring module 20 disposed to the right of the multiple energy storage devices 11, as shown in FIGS. 6 to 9. As shown in FIG. 6, the busbar accommodating portion 41 includes a peripheral wall 41A and a bottom wall 41B extending horizontally from the lower end of the peripheral wall 41A toward the inside of the peripheral wall 41A. A notch 41C is provided in a portion of the peripheral wall 41A extending in the front-rear direction. In this embodiment, two bottom walls 41B are provided, extending in the left-right direction from the center of the peripheral wall 41A in the front-rear direction. That is, the busbar accommodating portion 41 includes a pair of left and right bottom walls 41B. Two engagement portions 43 are formed on each bottom wall 41B so as to protrude upward from the bottom wall 41B.

[0037] As shown in Fig. 7, the busbar 30 is accommodated inside the peripheral wall 41A of the busbar accommodating portion 41. As shown in Figs. 8 and 9, when the busbar 30 is placed inside the busbar accommodating portion 41, the mounting surface 30A of the busbar 30 faces the bottom wall 41B. The engaging portions 43 are each arranged in the recessed portion 35 of the conductive portion 33 and engage with the inner wall of the recessed portion 35. In detail, the four engaging portions 43 of the busbar accommodating portion 41 engage with the two conductive portions 33 arranged on the front side and the two conductive portions 33 arranged on the rear side, out of the eight conductive portions 33.

[0038] A horizontal clearance CL1 is provided between the engaging portion 43 and the recess 35. This makes it possible to absorb manufacturing tolerances and assembly tolerances of the bus bar 30, the protector 40, and the electrode terminals 12A and 12B. Furthermore, when these components expand or contract due to temperature changes, it becomes easier to accommodate dimensional changes due to the expansion and contraction of each of these components.

[0039] Although not shown, a locking portion that locks the bus bar 30 from above may be provided on the peripheral wall 41A of the bus bar accommodating portion 41. For example, an elastic piece that is elastically deformable in the horizontal direction may be provided on the peripheral wall 41A, and an end of the elastic piece may serve as the locking portion.

[0040] 2, the board accommodating portion 42 extends in the front-rear direction and is formed in a groove shape. The board accommodating portion 42 includes a pair of left and right side walls 44 and a bottom wall 45 connecting the lower ends of the pair of side walls 44. Of the pair of side walls 44, the side wall 44 closer to the busbar accommodating portion 41 has a notch 44A formed in a position corresponding to the notch 41C of the busbar accommodating portion 41.

[0041] The cutout portions 41C and 44A are configured to accommodate metal pieces 15 for electrically connecting the bus bar 30 and the voltage detection line 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 made by, for example, soldering. The connection between the metal piece 15 and the bus bar 30 is made by, for example, welding.

[0042] [Effects of the First Embodiment] According to the first embodiment, the following actions and effects are achieved. The wiring module 20 of embodiment 1 is a wiring module 20 that is attached to a plurality of storage elements 11 having electrode terminals 12A, 12B, and includes a bus bar 30 and a protector 40 that includes a bus bar accommodating portion 41 that accommodates the bus bar 30. The bus bar 30 includes electrode connection portions 31 that are connected to the electrode terminals 12A, 12B, flexible portions 32 that are arranged between adjacent electrode connection portions 31 and are elastically deformable, and conductive portions 33 that provide electrical continuity between the electrode connection portions 31 and the flexible portions 32. The conductive portions 33 are recessed or protruded from a mounting surface 30A that is arranged on the storage element 11 side of the bus bar 30. The bus bar accommodating portion 41 is arranged between the bus bar 30 and the storage element 11 and includes a bottom wall 41B that faces the mounting surface 30A, and an engaging portion 43 that is formed on the bottom wall 41B and engages with the conductive portions 33.

[0043] With this configuration, the conductive portion 33 recessed or protruding from the mounting surface 30A engages with the engaging portion 43 formed on the bottom wall 41B of the busbar accommodating portion 41, thereby allowing the busbar 30 to be positioned relative to the protector 40 in a direction parallel to the mounting surface 30A.

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

[0045] With this configuration, the conductive portion 33 recessed from the mounting surface 30A and the engaging portion 43 protruding from the bottom wall 41B engage with each other, allowing the bottom wall 41B to be formed thin, which makes it easier to reduce the size of the busbar accommodating portion 41 in the direction perpendicular to the mounting surface 30A.

[0046] In the first embodiment, a clearance CL1 is provided between the conductive portion 33 and the engaging portion 43 in a direction parallel to the placement surface 30A.

[0047] This configuration can absorb manufacturing tolerances and assembly tolerances of bus bar 30, electrode terminals 12A and 12B, and bus bar accommodating portion 41 in the direction parallel to mounting surface 30A. In addition, flexible portion 32 can elastically deform in the direction parallel to mounting surface 30A.

[0048] In the first embodiment, a plurality of conductive portions 33 and a plurality of engaging portions 43 are provided for each bus bar 30.

[0049] With this configuration, rotation of busbar 30 within busbar accommodating portion 41 can be suppressed.

[0050] In the first embodiment, the conductive portion 33 is formed by overlapping the electrode connection portion 31, the flexible portion 32, and the protective member 34 that is disposed together with the electrode connection portion 31 and sandwiches the flexible portion 32 therebetween.

[0051] According to this configuration, the provision of the protective member 34 can prevent damage to the flexible portion 32 that occurs when the conductive portion 33 is formed.

[0052] <Embodiment 2> A second embodiment of the present disclosure will be described with reference to Figures 10 and 11. The wiring module 120 according to the second embodiment is configured similarly to the first embodiment except for the number and dimensions of the engaging portions 143, and therefore a description of the same components and effects as those of the first embodiment will be omitted. Note that, for multiple identical components, only some of the components may be assigned reference numerals, and the reference numerals of the other components may be omitted.

[0053] As shown in FIG. 11, one engaging portion 143 is formed on each of a pair of bottom walls 41B of the busbar accommodating portion 141. That is, two engaging portions 143 are provided for one busbar accommodating 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 recess 35. Therefore, in this embodiment, the engaging portion 143 is press-fitted into the recess 35 (see FIG. 10). That is, in this embodiment, the clearance CL1 of the first embodiment is not provided.

[0054] In this embodiment, the two engaging portions 143 are press-fitted into the recesses 35 of the conductive portion 33 that connects one of the two electrode connection portions 31 of the busbar 30 (the front electrode connection portion 31 in this embodiment) to the base portion 32A. Thus, one of the two electrode connection portions 31 of the busbar 30 is fixed to the busbar accommodating portion 141. This allows elastic deformation of the flexible portion 32 in the front-rear direction, left-right direction, and up-down direction. In other words, the other of the two electrode connection portions 31 of the busbar 30 is displaceable in the front-rear direction, left-right direction, and up-down direction relative to one of the electrode connection portions 31.

[0055] In this embodiment, since the electrode connection portion 31 is fixed to the busbar accommodating portion 141, it is possible to restrict the busbar 30 from moving upward relative to the busbar accommodating portion 141 without providing a locking portion in the busbar accommodating portion 141 that locks onto the busbar 30 from above.

[0056] [Effects of Embodiment 2] According to the second embodiment, the following actions and effects are achieved. In the second embodiment, the engaging portion 143 is press-fitted into the conducting portion 33 .

[0057] With this configuration, busbar 30 can be fixed to busbar accommodating portion 141. Therefore, busbar 30 can be positioned with respect to protector 40 in the direction parallel to mounting surface 30A and in the direction perpendicular to mounting surface 30A.

[0058] <Other embodiments> (1) In the above-described first and second embodiments, the conductive portion 33 is recessed from the mounting surface 30A, and the engaging portion 43, 143 protrudes from the bottom wall 41B. However, this is not limiting, and the conductive portion may be protruding from the mounting surface, and the engaging portion may be recessed from the bottom wall. In this case, the engaging portion may be the inner wall of a hole formed through the bottom wall. (2) In the first embodiment, eight conductive portions 33 are provided per busbar 30, and four engaging portions 43 are provided per busbar accommodating portion 41. However, this is not limited to this, and the number of conductive portions per busbar, the number of engaging portions per busbar accommodating portion, and the positional relationship between the conductive portions and the engaging portions may be changed as appropriate. When the engaging portions 143 are press-fitted into the recesses 35 of the conductive portions 33 as in the second embodiment, it is preferable that the press-fit structure between the conductive portions and the engaging portions be positioned closer to one of the two electrode connection portions of the busbar.

[0059] (3) In the first and second embodiments, the busbar 30 includes two electrode connection portions 31 and one flexible portion 32. However, this is not limited to this. For example, if the busbar connects energy storage elements in parallel, the busbar may include n electrode connection portions and (n-1) flexible portions, where n is an integer greater than or equal to 3. (4) In the above-described first and second embodiments, the flexible portion 32 is formed by laminating multiple metal foils and has a slit 32C extending in the front-rear direction. However, the flexible portion may be formed in any manner as long as it is configured to be elastically deformable. For example, the flexible portion may not have a slit. The flexible portion may also be formed of an electric wire or the like.

[0060] (5) In the first and second embodiments, the flexible substrate 21 is used as the voltage detection line, but this is not limiting. For example, an electric wire may be used as the voltage detection line, or an electric wire and a flexible substrate may be used. (6) In the above-mentioned first and second embodiments, the bus bar 30 and the flexible substrate 21 are electrically connected via the metal piece 15, but this is not limited to this, and the bus bar and the flexible substrate may be directly connected by welding, soldering, etc. [Explanation of symbols]

[0061] 1: Vehicle 2: Energy storage pack 3: PCU 4: Wire harness 10: Energy storage module 11: Energy storage element 12A,12B: Electrode terminal 15: Small metal piece 20: Wiring module 21: Flexible PCB 22: Board body 23: Extension part 24: Board side connection part 30: Busbar 30A: Placement surface 31: Electrode connection part 31A: Through hole 32: Flexible part 32A: Base 32B: Protrusion 32C: Slit 33: Conductive part 34: Protective material 35: Recess 36: Convex 37: End busbar 40: Protector 41,141: Busbar housing 41A: Surrounding wall 41B: Bottom wall 41C: Cutout 42: Circuit board housing 43,143: Engagement part 44: Side wall 44A: Cutout 45: Bottom wall 120: Wiring module CL1: Clearance

Claims

1. A wiring module attached to a plurality of energy storage elements having electrode terminals, A bus bar and a protector including a bus bar accommodating portion that accommodates the bus bar, the bus bar includes electrode connection portions connected to the electrode terminals, flexible portions arranged between adjacent electrode connection portions and capable of elastic deformation, and conductive portions that electrically connect the electrode connection portions and the flexible portions; the conductive portion is recessed or protruded from a mounting surface of the bus bar that is disposed on the side of the energy storage element, the busbar accommodating portion is disposed between the busbar and the energy storage element and includes a bottom wall facing the placement surface, and an engaging portion formed on the bottom wall that engages with the conductive portion.

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

3. 3. The wiring module according to claim 1, wherein a clearance is provided between the conductive portion and the engaging portion in a direction parallel to the placement surface.

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

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

6. 3. The wiring module according to claim 1, wherein the conductive portion is formed by overlapping the electrode connection portion, the flexible portion, and a protective member that is arranged together with the electrode connection portion to sandwich the flexible portion.

Images