Wiring module

Abstract

A wiring module (20) is attached to a battery stack (11L), the battery stack (11L) being configured by stacking a plurality of power storage elements provided with electrode terminals, and the wiring module (20) is provided with: a plurality of conductive members electrically connected to the electrode terminals; a protector (50) which is provided with a first unit (50A) and a second unit (50B) that is separate from the first unit (50A), and which holds the plurality of conductive members; and an assembly member (60) in which the first unit (50A) and the second unit (50B) are linked so as to be capable of sliding relative to each other in a stacking direction in which the power storage elements are stacked, the assembly member (60) being assembled to both the first unit (50A) and the second unit (50B) in a first direction orthogonal to the stacking direction, the first unit (50A), the second unit (50B), and the assembly member (60) each having an opposing surface, the first unit (50A) being attached to the first unit (50A), the second unit (50B), and the assembly member (60) being attached to the second unit (50B) in a second direction orthogonal to the stacking direction. The facing surface of the first unit (50A) and the facing surface of the assembly member (60) face each other in a first direction, the facing surface of the second unit (50B) and the facing surface of the assembly member (60) face each other in the first direction, one of the first unit (50A) and the assembly member (60) is provided with a first protrusion (61) protruding from the facing surface in the first direction, and the other of the first unit (50A) and the assembly member (60) is provided with a first through-hole (55A). A first protrusion (61) is inserted into the first through-hole (55A), one of the second unit (50B) and the assembly member (60) is provided with a second protrusion (71) protruding from the facing surface in the first direction, the other of the second unit (50B) and the assembly member (60) is provided with a second through-hole (55B), the second protrusion (71) is inserted into the second through-hole (55B), the first protrusion (61) is provided with a first contact portion (64A) facing the inner wall of the first through-hole (55A) in the stacking direction, and the second protrusion (61) is provided with a second contact portion (64A) facing the inner wall of the first through-hole (55A) in the stacking direction. A first gap (CL1) is provided between the first contact section (64A) and the inner wall of the first through-hole (55A).

Description

Technical Field

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

[0002] High-voltage battery packs for electric vehicles, hybrid vehicles, etc. are usually stacked with multiple single cells, which are electrically connected in series or in parallel through a wiring module. As such a wiring module, the wiring module described in Japanese Patent Gazette No. 2013-16380 (hereinafter referred to as Patent Document 1) is known in the past. The battery wiring module described in Patent Document 1 includes a plurality of connecting members connected between the electrode terminals of the single cells and a connecting unit made of synthetic resin that accommodates the plurality of connecting members. The connecting unit includes a first unit and a second unit, and the first unit and the second unit can slide relative to each other in the direction of the single cell stacking. As a result, the battery wiring module of Patent Document 1 can absorb the assembly tolerance of the single cells and the battery wiring module in the direction of the single cell stacking. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-16380 Summary of the invention Problems to be solved by the invention

[0004] However, in the case where other components are added to the above-mentioned structure, other components may be assembled to both the first unit and the second unit. In this case, it is considered that the sliding movement of the first unit and the second unit is hindered by the other components. Solutions to Solve Problems

[0005] The wiring module of the present invention is assembled on a battery stack, and the battery stack is formed by stacking a plurality of storage elements having electrode terminals, and the wiring module comprises: a plurality of conductive members electrically connected to the electrode terminals; a protector comprising a first unit and a second unit separate from the first unit, which holds the plurality of conductive members; and an assembly member, wherein the first unit and the second unit are connected to each other so as to be slidable and movable in a stacking direction in which the storage elements are stacked, and the assembly member is assembled to both the first unit and the second unit in a first direction orthogonal to the stacking direction, and the first unit, the second unit and the assembly member respectively have opposing surfaces, the opposing surface of the first unit and the opposing surface of the assembly member are opposed in the first direction, and the second unit The opposing surface of the element and the opposing surface of the assembly component are opposed to each other in the first direction, one of the first unit and the assembly component includes a first protrusion protruding from the opposing surface in the first direction, a first through hole is formed in the other of the first unit and the assembly component, and the first protrusion is inserted into the first through hole, one of the second unit and the assembly component includes a second protrusion protruding from the opposing surface in the first direction, a second through hole is formed in the other of the second unit and the assembly component, and the second protrusion is inserted into the second through hole, the first protrusion includes a first abutting portion opposed to an inner wall of the first through hole in the stacking direction, and a first gap is set between the first abutting portion and the inner wall of the first through hole. Effects of the Invention

[0006] According to the present invention, a wiring module can be provided, which includes a protector and an assembly component, wherein the protector includes a first unit and a second unit that can slide relative to each other, and the assembly component is assembled to both the first unit and the second unit, and the assembly component allows the first unit and the second unit to slide relative to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view showing a state where an assembly member is assembled to a protector in the power storage module according to the embodiment. Figure 2 It is a perspective view of a power storage module. Figure 3 This is a front view of the power storage module with assembly components removed. Figure 4 This is a front view of the power storage module. Figure 5 It is a perspective view showing the convex part and the concave part arranged on the upper part of the protector. Figure 6 It is a perspective view showing a state in which the convex portion is accommodated in the concave portion in the upper portion of the protector. Figure 7 It is a perspective view showing the convex part and the concave part arranged at the lower part of the protector. Figure 8 It is a three-dimensional diagram of the assembled components. Fig. 9 It is a perspective view of the first protrusion of the assembly member. Fig.10 yes Figure 4 AA section view. Fig.11 yes Figure 4 BB cross-sectional view. Fig.12 yes Figure 4 CC cross-sectional view. Fig.13 yes Figure 4 DD cross-sectional view. Fig.14 It is a cross-sectional view schematically showing the first gap, the second gap, the third gap, and the fourth gap. Fig.15 It is a perspective view of the front part of a battery stack. Fig.16 It is a perspective view showing the main parts of a laminate type battery. DETAILED DESCRIPTION

[0008] [Description of Embodiments of the Invention] First, embodiments of the present invention will be described by way of examples.

[0009] (1) The wiring module of the present invention is assembled on a battery stack, the battery stack being formed by stacking a plurality of storage elements having electrode terminals, the wiring module comprising: a plurality of conductive members electrically connected to the electrode terminals; a protector comprising a first unit and a second unit separate from the first unit, holding the plurality of conductive members; and an assembly member, the first unit and the second unit being connected so as to be slidable relative to each other in a stacking direction in which the storage elements are stacked, the assembly member being assembled to both the first unit and the second unit in a first direction orthogonal to the stacking direction, the first unit, the second unit and the assembly member respectively having opposing surfaces, the opposing surface of the first unit and the opposing surface of the assembly member being opposed in the first direction, The opposing surface of the second unit and the opposing surface of the assembly member are opposed to each other in the first direction, one of the first unit and the assembly member includes a first protrusion protruding from the opposing surface in the first direction, a first through hole is formed in the other of the first unit and the assembly member, and the first protrusion is inserted into the first through hole, one of the second unit and the assembly member includes a second protrusion protruding from the opposing surface in the first direction, a second through hole is formed in the other of the second unit and the assembly member, and the second protrusion is inserted into the second through hole, the first protrusion includes a first abutting portion opposed to an inner wall of the first through hole in the stacking direction, and a first gap is set between the first abutting portion and the inner wall of the first through hole.

[0010] According to such a structure, by setting the first gap between the first abutment portion of the first protrusion and the inner wall of the first through hole, the first unit can slide relative to the assembly member in the stacking direction. Therefore, even when the assembly member is assembled to the protector, it is easy to allow the first unit and the second unit to slide relative to each other in the stacking direction.

[0011] (2) Preferably, the assembly member includes the first protrusion and the second protrusion, the first through hole is formed in the first unit, and the second through hole is formed in the second unit.

[0012] According to such a configuration, since the first unit and the second unit do not include the protrusion, the protrusion does not hinder the work of attaching the conductive member to the first unit and the second unit.

[0013] (3) Preferably, the second protrusion includes a second abutment portion disposed opposite to an inner wall of the second through hole in the stacking direction, and a second gap is set between the second abutment portion and the inner wall of the second through hole, wherein the second gap is smaller than the first gap.

[0014] According to this structure, by setting the second gap smaller than the first gap between the second abutment portion of the second protrusion and the inner wall of the second through hole, the second unit is less likely to slide relative to the assembly member in the stacking direction than the first unit.

[0015] (4) Preferably, the first protrusion comprises a first extension portion and a first diameter-enlarged portion, the first extension portion extends from the opposing surface to the first direction, the first diameter-enlarged portion is arranged at the top end of the first extension portion, and protrudes from the first extension portion in a direction orthogonal to the first direction, the first diameter-enlarged portion comprises a first locking portion that is locked with the hole edge portion of the first through hole in the first direction, and the second protrusion comprises a second extension portion and a second diameter-enlarged portion, the second extension portion extends from the opposing surface to the first direction, the second diameter-enlarged portion is arranged at the top end of the second extension portion, and protrudes from the second extension portion in a direction orthogonal to the first direction, and the second diameter-enlarged portion comprises a second locking portion that is locked with the hole edge portion of the second through hole in the first direction.

[0016] According to such a structure, the first protrusion can be prevented from falling out of the first through hole by the first stopper and the hole edge of the first through hole. The second protrusion can be prevented from falling out of the second through hole by the second stopper and the hole edge of the second through hole.

[0017] (5) Preferably, a direction orthogonal to both the first direction and the stacking direction is a second direction, and a dimension of the first through hole in the second direction is smaller than a dimension of the first through hole in the stacking direction.

[0018] According to such a configuration, by reducing the size of the first through hole in the second direction orthogonal to the stacking direction in which the first gap is provided, the first locking portion and the hole edge of the first through hole are easily locked.

[0019] (6) Preferably, the first diameter-enlarged portion protrudes from the first extended portion in the second direction, and is arranged on the inner side of the first extended portion in the stacking direction.

[0020] According to such a structure, even when the first diameter-enlarged portion is made to protrude in the stacking direction, it is necessary to increase the protrusion amount of the first diameter-enlarged portion from the first extended portion by the amount of the first gap. However, in the above structure, since the first diameter-enlarged portion is made to protrude in the second direction instead of the stacking direction from the first extended portion, the protrusion amount of the first diameter-enlarged portion from the first extended portion can be reduced, and the first diameter-enlarged portion can be miniaturized.

[0021] (7) Preferably, the first diameter-enlarged portion is a pair of first flexible pieces extending from the first extended portion to both sides in the second direction, and the pair of first flexible pieces are elastically deformable in the second direction.

[0022] According to such a structure, the first protrusion can be easily inserted into the first through hole.

[0023] (8) Preferably, the first protrusion has a first bending space between the pair of first bending pieces that allows the pair of first bending pieces to bend.

[0024] According to such a configuration, by providing the first bending space, the first bending piece is easily bent, and the first protrusion is further easily inserted into the first through hole.

[0025] (9) Preferably, the plurality of conductive members include a bus bar, and only one of the first unit and the second unit includes a bus bar holding portion that holds the bus bar.

[0026] Since a busbar through which a large current flows tends to generate heat, a material having high heat resistance is used in the protector having the busbar holding portion. According to the above structure, in the first unit and the second unit, a material having high heat resistance is used only in the side having the busbar holding portion, and a cheap general material having heat resistance is used in the other side not having the busbar holding portion, thereby reducing the manufacturing cost of the protector.

[0027] [Details of Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described. The present invention is not limited to these examples but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0028] <Implementation Method> Reference Figures 1 to 16 An embodiment of the present invention is described. The power storage module 10 having the wiring module 20 of the present embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and is used as a driving source of the vehicle. In the following description, regarding a plurality of identical components, sometimes only a part of the components are marked with reference numerals, and the reference numerals of other components are omitted. In the following description, the direction indicated by the arrow line X is described as the front, the direction indicated by the arrow line Y is described as the left, and the direction indicated by the arrow line Z is described as the top. In the present embodiment, the left-right direction is an example of a stacking direction, the front-back direction is an example of a first direction, and the up-down direction is an example of a second direction.

[0029] [Battery stack] The power storage module 10 includes Fig.15 The battery stack 11L shown in FIG. Figure 1The wiring module 20 is mounted on the battery stack 11L. Figure 1 As shown, the power storage module 10 of this embodiment further includes a case 15 that covers the battery stack 11L from four directions, top, bottom, left and right. The case 15 is composed of a bottom 15A arranged on the lower surface side of the battery stack 11L, a top 15B arranged on the upper surface side of the battery stack 11L, and a pair of side portions 15C connecting the bottom 15A and the top 15B on both sides.

[0030] [Laminated batteries, electrode leads] like Fig.15 As shown, the battery stack 11L is formed by stacking a plurality (18 in this embodiment) of laminated batteries 11 (an example of a storage element) in a stacking direction (left-right direction). Fig.15 In FIG. 1 , only the front side portion of the battery stack 11L is shown. Fig.16 As shown, the laminated battery 11 is long in the front-to-back direction and flat in the left-to-right direction. An electric storage element (not shown) is stored inside the laminated battery 11. A pair of electrode leads 12 (an example of electrode terminals) are arranged on both sides of the laminated battery 11 in the front-to-back direction, and protrude in opposite directions. The pair of electrode leads 12 are plate-shaped and have opposite polarities.

[0031] [Joint] like Fig.15 As shown, a joint 13 is provided in the battery stack 11L, and the four electrode leads 12 of the laminated battery 11 arranged continuously in the left-right direction are electrically connected to the joint 13. That is, the four electrode leads 12 are bent roughly vertically to the left or right and overlapped, and the joint 13 is formed by joining by laser welding. The electrode lead 12 constituting the joint 13 is a connecting electrode lead 12A. Among the four connecting electrode leads 12A, the two connecting electrode leads 12A arranged on the right and the two connecting electrode leads 12A arranged on the left have opposite polarities. For example, the two connecting electrode leads 12A on the right are positive electrodes, and the two connecting electrode leads 12A on the left are negative electrodes. Therefore, in the battery stack 11L, the joint 13 connects the two laminated batteries 11 connected in parallel in series. The battery stack 11L has four joints 13 at the front. In addition, although not shown, the battery stack 11L also has four joints 13 at the rear.

[0032] The battery stack 11L has an output portion 14 at the left end portion of the front portion. In addition, although not shown in the figure, the battery stack 11L also has an output portion 14 at the right end portion of the rear portion. The output portion 14 is formed by joining two electrode leads 12 that do not constitute the joining portion 13 among the electrode leads 12. The electrode lead 12 that constitutes the output portion 14 is an output electrode lead 12B. The two output electrode leads 12B that constitute one output portion 14 have the same polarity. The output portion 14 constitutes the positive electrode or negative electrode of the entire battery stack 11L. That is, for example, when the output portion 14 at the front is the total positive electrode of the battery stack 11L, the output portion 14 at the rear is the total negative electrode of the battery stack 11L.

[0033] [Wiring module] like Figure 1 As shown, the wiring module 20 of the present embodiment includes: a terminal 30 connected to the connection electrode lead 12A; a bus bar 40 connected to the output electrode lead 12B; a protector 50 that holds the terminal 30 and the bus bar 40; and an assembly member 60 assembled to the protector 50. In addition, the terminal 30 and the bus bar 40 are examples of conductive members. The structure of the wiring module 20 arranged on the front side of the storage module 10 is described in detail below. Although not shown in the figure, the wiring module 20 arranged on the rear side of the storage module 10 is configured in the same manner as the wiring module 20 arranged on the front side of the storage module 10.

[0034] [Bus Bar] The bus bar 40 is in a plate shape and is formed by processing a conductive metal plate. Figure 3 As shown, the bus bar 40 includes a first portion 40A extending in the vertical direction and a second portion 40B connected to the upper end of the first portion 40A. The first portion 40A is flat in the front-to-back direction. The second portion 40B extends rightward from the upper end of the first portion 40A and is flat in the vertical direction. The bus bar 40 is held by the bus bar holding portion 53 of the protector 50 (first unit 50A) and is connected to the output electrode lead 12B at the center of the first portion 40A in the vertical direction. A bus bar side connection portion 41 is provided at the right end of the second portion 40B.

[0035] like Figure 2 As shown, the bus bar side connection part 41 has an insertion hole 41A for inserting a bolt. An external connection terminal (not shown) overlaps the bus bar side connection part 41 and is bolted to the bus bar side connection part 41. Thus, the bus bar side connection part 41 is electrically connected to the external connection terminal. The external connection terminal is used to connect an external device (not shown) and the power storage module 10.

[0036] [Terminal] The terminal 30 is provided by processing a conductive metal plate. Figure 3As shown, the terminal 30 includes a main body 31, a connecting portion 32 extending to the right from the main body 31, and a wire connecting portion 34 extending upward from the main body 31. The main body 31 is received and held in the terminal receiving portion 54 of the protector 50. The connecting portion 32 is connected in a manner of contacting with the joint 13 or a part of the connecting electrode lead 12A constituting the joint 13. That is, the terminal 30 is not a member for connecting between adjacent connecting electrode leads 12A, but a member for connecting between the pre-connected connecting electrode lead 12A (joint 13) and the wire (not shown).

[0037] The wire connection portion 34 has a tightening piece crimped to the wire. The wire connected to the terminal 30 through the wire connection portion 34 is laid in the laying recess 56 of the protector 50 and laid at a predetermined position. The wire is connected to an external ECU (Electronic Control Unit) via a connector (not shown). The ECU is equipped with a microcomputer, components, etc., and is a well-known structure with functions such as detecting the voltage, current, temperature, etc. of each laminated battery 11 or controlling the charge and discharge of each laminated battery 11.

[0038] [Protector, Unit 1, Unit 2] The protector 50 is made of insulating synthetic resin and is in the shape of a plate. Figure 1 As shown, the protector 50 is positioned in the housing 15 (and the battery stack 11L). The protector 50 is composed of a first unit 50A and a second unit 50B that is separate from the first unit 50A. The first unit 50A constitutes the left side portion of the protector 50, and the second unit 50B constitutes the right side portion of the protector 50. The first unit 50A and the second unit 50B can slide relative to each other in the left-right direction. Thus, the assembly tolerance of the protector 50 and the battery stack 11L can be absorbed. In addition, the protector 50 can follow the expansion or contraction of the battery stack 11L in the stacking direction caused by the use of the storage module 10.

[0039] Specifically, if Figure 3 As shown, the first unit 50A and the second unit 50B are provided with a sliding structure 51. The sliding structure 51 is provided at the upper part of the protector 50 and close to the left and right center position (refer to Figure 5 and Figure 6 ), and the lower part of the protector 50 and the position near the left end (refer to Figure 7 ).like Figures 5 to 7 As shown, the slide structure 51 includes a convex portion 51A and a concave portion 51B that can accommodate the convex portion 51A. The slide structure 51 is designed so that the first unit 50A and the second unit 50B can move relative to each other in the left-right direction by a predetermined length when the convex portion 51A is accommodated in the concave portion 51B.

[0040] like Figure 3 As shown, in the central part of the protector 50 in the vertical direction, electrode storage recesses 52 are arranged in parallel in the left-right direction. The electrode storage recesses 52 are formed through the front-to-back direction and are in a rectangular shape that is longer in the upper and lower directions. The electrode storage recesses 52 are composed of a connection electrode storage recess 52A that receives the joint 13 and the connection electrode lead 12A and an output electrode storage recess 52B that receives the output electrode lead 12B and the output portion 14. The connection electrode storage recess 52A is provided in the first unit 50A. The output electrode storage recess 52B is composed of the end edge of the first unit 50A and the end edge of the second unit 50B.

[0041] The bus bar holding portion 53 for holding the bus bar 40 is provided on the upper and lower sides of the output electrode storage recess 52B in the first unit 50A. A bolt fastening portion 53A for bolt-fastening the bus bar 40 is provided on the right side of the upper bus bar holding portion 53. The terminal storage portion 54 for storing the main body portion 31 of the terminal 30 is provided on the oblique lower left side of the connection electrode storage recess 52A of the second unit 50B.

[0042] In this embodiment, the first unit 50A that holds the bus bar 40 has high heat resistance. In addition, the first unit 50A is also provided with a bolt fastening portion 53A, so the first unit 50A has high strength. Unlike the first unit 50A that requires such high heat resistance and high strength, the second unit 50B can also use a resin material with lower heat resistance and strength than the first unit 50A. As a result, the manufacturing cost of the protector 50 can be reduced.

[0043] [First through hole] like Figure 1 and Figure 3 As shown, a first through hole 55A is formed in the upper part and the left and right center of the first unit 50A, which penetrates the first unit 50A in the front-to-back direction. The first through hole 55A is provided on the front surface 50AS (an example of the opposing surface) of the first unit 50A. The first through hole 55A is rectangular in front view. The dimension of the first through hole 55A in the left-right direction is greater than the dimension of the first through hole 55A in the up-down direction.

[0044] [Second through hole] A second through hole 55B is formed near the lower right end of the second unit 50B and penetrates the second unit 50B in the front-to-back direction. The second through hole 55B is provided on the front surface 50BS (an example of the opposing surface) of the second unit 50B. The second through hole 55B is rectangular in front view. The dimension of the second through hole 55B in the left-right direction is smaller than the dimension of the second through hole 55B in the up-down direction.

[0045] A third through hole 55C is formed at a position near the upper right end of the second unit 50B and at a position near the lower left end of the second unit 50B, which penetrates the second unit 50B in the front-to-back direction. The third through hole 55C is provided on the front surface 50BS of the second unit 50B. The third through hole 55C is rectangular in front view. The dimension of the third through hole 55C in the left-right direction is larger than the dimension of the third through hole 55C in the up-down direction. The third through hole 55C is formed with the same dimension as the first through hole 55A.

[0046] [Assembly components] The assembly member 60 is made of insulating synthetic resin and has a plate shape. Figure 1 , Figure 2 as well as Figure 4 As shown, the assembly member 60 is assembled to both the first unit 50A and the second unit 50B in the front-rear direction. In the present embodiment, the assembly member 60 is assembled to the protector 50 from the front and forms a cover that covers the entire terminal 30 and a part of the bus bar 40 .

[0047] like Figure 1 and Figure 8 As shown, the assembly member 60 includes a first protrusion 61, a second protrusion 71, and a third protrusion 81 that protrude rearward from a rear surface 60S (an example of an opposing surface) of the assembly member 60. The first protrusion 61 is disposed at the upper left portion of the assembly member 60. The second protrusion 71 is disposed at the lower right portion of the assembly member 60. The third protrusion 81 is disposed at the lower left portion and the upper right portion of the assembly member 60. Figure 1 As shown, the first protrusion 61 , the second protrusion 71 , and the third protrusion 81 are respectively inserted into the first through-hole 55A, the second through-hole 55B, and the third through-hole 55C.

[0048] [First protrusion, first extension portion, first contact portion] like Fig. 9 As shown, the first protrusion 61 includes a first extension portion 62 extending rearward from the rear surface 60S of the assembly member 60 and a first diameter expansion portion 63 arranged at the top end (rear end) of the first extension portion 62. The first extension portion 62 includes two first column portions 64 and a first beam portion 65 connecting the rear ends of the two first column portions 64. The two first column portions 64 are arranged side by side in the left-right direction. Fig.11 As shown, the first column portion 64 includes a first contact portion 64A, and the first contact portion 64A is disposed inside the first through-hole 55A and faces the inner wall of the first through-hole 55A in the left-right direction.

[0049] [First expanded diameter portion, a pair of first flexure pieces] like Fig. 9As shown in FIG. 1 , the first diameter-enlarged portion 63 protrudes upward and downward from the first beam portion 65 of the first extension portion 62. The first diameter-enlarged portion 63 is disposed between the two first pillar portions 64 and disposed on the inner side of the first extension portion 62 in the left-right direction. Fig.10 As shown in the figure, the first diameter expansion portion 63 is formed as a pair of first flexure pieces 66 that can be flexibly deformed in the upward and downward directions. The first flexure piece 66 disposed on the upper side of the first beam portion 65 extends forward and upward from the first beam portion 65. The first flexure piece 66 disposed on the lower side of the first beam portion 65 extends forward and downward from the first beam portion 65. The top end portion (front end portion) of the first flexure piece 66 is formed as a first stopper 66A. The first stopper 66A is a surface that is substantially parallel to the rear surface 60S of the assembly member 60.

[0050] [1st bending space] A first bending space 66B is provided between the pair of first bending pieces 66, and the first bending piece 66 can be deformed and enter the first bending space 66B. Fig.11 As shown, the first bending space 66B is provided between the two first column portions 64 .

[0051] [Regarding the assembly of the first protrusion into the first through hole] When the first protrusion 61 is inserted into the first through hole 55A, the front surface 50AS of the first unit 50A and the rear surface 60S of the assembly component 60 are arranged in an opposing manner, and the first unit 50A and the assembly component 60 are close to each other. The first diameter expansion portion 63 engages with the inner wall of the first through hole 55A, and the pair of first flexure pieces 66 are flexed and deformed. The first flexure piece 66 on the upper side flexes downward to enter the first flexure space 66B, and the first flexure piece 66 on the lower side flexes upward to enter the first flexure space 66B, so that the first diameter expansion portion 63 enters the interior of the first through hole 55A. When the first diameter expansion portion 63 moves toward the front of the first through hole 55A, the pair of first flexure pieces 66 return to a natural state (refer to Fig.10 ). The first stopper 66A at the top end of the first flexure piece 66 is arranged opposite to the edge of the first through hole 55A of the first unit 50A and can be stopped by the edge of the first through hole 55A. Therefore, the first protrusion 61 is prevented from coming off in a state of being inserted into the first through hole 55A.

[0052] [1st gap] like Fig.11As shown in FIG. 1 , in a state where the first protrusion 61 is inserted into the first through hole 55A, a first gap CL1 is set between the first abutting portion 64A and the inner wall of the first through hole 55A opposite to the first abutting portion 64A. Specifically, the first gap CL1 is a gap obtained by combining the first gap CL1A on the right side between the first abutting portion 64A provided on the right side and the inner wall of the first through hole 55A on the right side and the first gap CL1B on the left side between the first abutting portion 64A provided on the left side and the inner wall of the first through hole 55A on the left side. By providing the first gap CL1, the first unit 50A can move in the left-right direction relative to the assembly member 60 by the amount of the first gap CL1. Therefore, the first unit 50A is allowed to slide in the left-right direction relative to the second unit 50B.

[0053] like Fig.10 As shown, a third gap CL3 is provided between the first extension portion 62 and the first through hole 55A in the up-down direction. Specifically, an upper third gap CL3A is provided between the upper surface of the first extension portion 62 and the inner wall of the upper first through hole 55A. A lower third gap CL3B is provided between the lower surface of the first extension portion 62 and the inner wall of the lower first through hole 55A. The third gap CL3 is a gap obtained by combining the upper third gap CL3A and the lower third gap CL3B. Fig.14 As shown in FIG. 1 , the third gap CL3 is set smaller than the first gap CL1 . Therefore, the first unit 50A is less likely to move in the vertical direction than in the horizontal direction relative to the assembly member 60 .

[0054] [Third protrusion] like Figure 8 As shown, the third protrusion 81 is constructed in the same manner as the first protrusion 61, so detailed description is omitted. A relatively large gap having the same size as the first gap CL1 is provided in the left-right direction between the third protrusion 81 and the inner wall of the third through hole 55C, and a relatively small gap (set as a fifth gap) having the same size as the third gap CL3 is provided in the up-down direction (refer to Fig.14 ).

[0055] [Second protrusion, second extension portion, second contact portion] like Figure 8 As shown in FIG. 1 , the second protrusion 71 is a structure in which the first protrusion 61 is rotated 90° relative to an axis extending in the front-rear direction. Fig.13 As shown in FIG. 1 , the second protrusion 71 includes a second extension portion 72 and a second diameter-enlarged portion 73. Fig.12 As shown in FIG. 1 , the second extension portion 72 includes two second pillars 74 arranged in the vertical direction and a second beam 75 connecting the rear ends of the second pillars 74 to each other. Fig.13As shown, the second column portion 74 includes a second contact portion 74A, and the second contact portion 74A is disposed inside the second through-hole 55B and faces the inner wall of the second through-hole 55B in the left-right direction.

[0056] [Second diameter expansion portion, second locking portion] The second enlarged diameter portion 73 is formed as a pair of second flexure pieces 76 that can be flexibly deformed in the left-right direction. The second flexure piece 76 disposed on the right side of the second beam portion 75 extends from the second beam portion 75 to the right front. The second flexure piece 76 disposed on the left side of the second beam portion 75 extends from the second beam portion 75 to the left front. The top end (front end) of the second flexure piece 76 is formed as a second stopper 76A. A second flexure space 76B is provided between the pair of second flexure pieces 76, and the second flexure piece 76 can be flexibly deformed and enter the second flexure space 76B.

[0057] [Second gap] When the second protrusion 71 is inserted into the second through hole 55B, a second gap CL2 is set between the second abutting portion 74A and the inner wall of the second through hole 55B opposite to the second abutting portion 74A. Specifically, the second gap CL2 is a gap obtained by combining the second gap CL2A on the right side between the second abutting portion 74A on the right side and the inner wall of the second through hole 55B on the right side and the second gap CL2B on the left side between the second abutting portion 74A on the left side and the inner wall of the second through hole 55B on the left side. Fig.14 As shown in FIG. 1 , the second gap CL2 is set smaller than the first gap CL1 . Therefore, the second unit 50B is less likely to move in the left-right direction relative to the assembly member 60 than the first unit 50A.

[0058] like Fig.12 As shown, a fourth gap CL4 is provided between the second extension portion 72 and the second through hole 55B in the up-down direction. Specifically, an upper fourth gap CL4A is provided between the upper surface of the second extension portion 72 and the inner wall of the upper second through hole 55B. A lower fourth gap CL4B is provided between the lower surface of the second extension portion 72 and the inner wall of the lower second through hole 55B. The fourth gap CL4 is a gap obtained by combining the upper fourth gap CL4A and the lower fourth gap CL4B. Fig.14 As shown, the fourth gap CL4 is larger than the second gap CL2. On the other hand, as described above, the fifth gap (not shown) between the third protrusion 81 and the third through hole 55C in the vertical direction is the same size as the third gap CL3 and smaller than the fourth gap CL4. Therefore, the length by which the second unit 50B can move relative to the assembly member 60 in the vertical direction is determined by the fifth gap (the same length as the third gap CL3). Therefore, it is also difficult for the second unit 50B to move relative to the assembly member 60 in the vertical direction.

[0059] [Effects of the Embodiments] According to the implementation mode, the following actions and effects are achieved. The wiring module 20 involved in the embodiment is mounted on a battery stack 11L, and the battery stack 11L is formed by stacking a plurality of storage elements (laminated batteries 11) having electrode terminals (electrode leads 12). The wiring module 20 includes: a plurality of conductive members (terminals 30 and bus bars 40) electrically connected to the electrode terminals; a protector 50 including a first unit 50A and a second unit 50B separate from the first unit 50A, and holding the plurality of conductive members; and an assembly member 60, wherein the first unit 50A and the second unit 50B are connected to each other so as to be slidable in a stacking direction (left-right direction) in which the storage elements are stacked, and the assembly member 60 is assembled to both the first unit 50A and the second unit 50B in a first direction (front-back direction) orthogonal to the stacking direction, and the first unit 50A, the second unit 50B and the assembly member 60 respectively have opposing surfaces, and the opposing surface (front surface 50AS) of the first unit 50A and the assembly member 60 are connected to each other so as to be slidable in a stacking direction (left-right direction) in which the storage elements are stacked. 0 is opposed in the first direction, the opposing surface (rear surface 60S) of the second unit 50B is opposed in the first direction, the opposing surface (front surface 50BS) of the second unit 50B and the opposing surface of the assembly member 60 are opposed in the first direction, one of the first unit 50A and the assembly member 60 has a first protrusion 61 protruding from the opposing surface in the first direction, and the other of the first unit 50A and the assembly member 60 has a first through hole 55A, the first protrusion 61 is inserted into the first through hole 55A, and the second unit 5 0B and one of the assembly components 60 have a second protrusion 71 protruding from the opposing surface toward the first direction, and a second through hole 55B is formed on the other side of the second unit 50B and the assembly component 60. The second protrusion 71 is inserted into the second through hole 55B, and the first protrusion 61 has a first abutment portion 64A opposite to the inner wall of the first through hole 55A in the stacking direction, and a first gap CL1 is set between the first abutment portion 64A and the inner wall of the first through hole 55A.

[0060] According to such a structure, by setting the first gap CL1 between the first abutment portion 64A of the first protrusion 61 and the inner wall of the first through hole 55A, the first unit 50A can slide in the stacking direction relative to the assembly member 60. Therefore, even when the assembly member 60 is assembled to the protector 50, the first unit 50A and the second unit 50B can slide relative to each other in the stacking direction.

[0061] In the embodiment, the assembly member 60 includes the first protrusion 61 and the second protrusion 71 , the first through-hole 55A is formed in the first unit 50A, and the second through-hole 55B is formed in the second unit 50B.

[0062] According to such a configuration, since the first unit 50A and the second unit 50B do not include the protrusions, the protrusions do not hinder the work of attaching the conductive members to the first unit 50A and the second unit 50B.

[0063] In the embodiment, the second protrusion 71 includes a second abutment portion 74A disposed opposite to the inner wall of the second through hole 55B in the stacking direction, and a second gap CL2 is defined between the second abutment portion 74A and the inner wall of the second through hole 55B. The second gap CL2 is smaller than the first gap CL1.

[0064] According to such a structure, by setting the second gap CL2 smaller than the first gap CL1 between the second abutment portion 74A of the second protrusion 71 and the inner wall of the second through hole 55B, the second unit 50B is less likely to slide in the stacking direction relative to the assembly member 60 than the first unit 50A. As a result, it is easy to position the assembly member 60 on the protector 50.

[0065] In an embodiment, the first protrusion 61 includes a first extension portion 62 and a first expanded diameter portion 63, the first extension portion 62 extends from the opposing surface to the first direction, the first expanded diameter portion 63 is arranged at the top end portion of the first extension portion 62, and protrudes from the first extension portion 62 in a direction orthogonal to the first direction, the first expanded diameter portion 63 includes a first stopping portion 66A that is stopped with the hole edge portion of the first through hole 55A in the first direction, and the second protrusion 71 includes a second extension portion 72 and a second expanded diameter portion 73, the second extension portion 72 extends from the opposing surface to the first direction, the second expanded diameter portion 73 is arranged at the top end portion of the second extension portion 72, and protrudes from the second extension portion 72 in a direction orthogonal to the first direction, and the second expanded diameter portion 73 includes a second stopping portion 76A that is stopped with the hole edge portion of the second through hole 55B in the first direction.

[0066] According to such a structure, the first protrusion 61 is prevented from falling out of the first through hole 55A by the first locking portion 66A locking with the hole edge of the first through hole 55A. The second protrusion 71 is prevented from falling out of the second through hole 55B by the second locking portion 76A locking with the hole edge of the second through hole 55B.

[0067] In the embodiment, a direction orthogonal to both the first direction and the stacking direction is a second direction (vertical direction), and a dimension of the first through hole 55A in the second direction is smaller than a dimension of the first through hole 55A in the stacking direction.

[0068] According to such a configuration, by reducing the size of the first through hole 55A in the second direction orthogonal to the stacking direction in which the first gap CL1 is provided, the first locking portion 66A and the hole edge of the first through hole 55A are easily locked.

[0069] In the embodiment, the first expanded diameter portion 63 protrudes from the first extended portion 62 in the second direction, and is arranged on the inner side of the first extended portion 62 in the stacking direction.

[0070] According to such a structure, even when the first diameter-enlarged portion 63 is made to protrude in the stacking direction, it is necessary to increase the protrusion amount of the first diameter-enlarged portion 63 from the first extended portion 62 by the amount of the first gap CL1. However, in the above structure, since the first diameter-enlarged portion 63 is made to protrude in the second direction rather than in the stacking direction from the first extended portion 62, the protrusion amount of the first diameter-enlarged portion 63 from the first extended portion 62 can be reduced, and the first diameter-enlarged portion 63 can be miniaturized.

[0071] In the embodiment, the first expanded diameter portion 63 is a pair of first flexible pieces 66 extending from the first extended portion 62 to both sides in the second direction, and the pair of first flexible pieces 66 can be elastically deformed in the second direction.

[0072] With such a structure, the first protrusion 61 can be easily inserted into the first through-hole 55A.

[0073] In the embodiment, the first protrusion 61 has the first bending space 66B between the pair of first bending pieces 66 , which allows the pair of first bending pieces 66 to bend.

[0074] According to such a configuration, by providing the first bending space 66B, the first bending piece 66 is easily bent, and the first protrusion 61 is further easily inserted into the first through-hole 55A.

[0075] In the embodiment, the plurality of conductive members include the bus bar 40 , and only one of the first unit 50A and the second unit 50B includes the bus bar holding portion 53 that holds the bus bar 40 .

[0076] Since the bus bar 40 through which a large current flows easily generates heat, a material having high heat resistance is used in the protector 50 having the bus bar holding portion 53. According to the above-mentioned structure, in the first unit 50A and the second unit 50B, a material having high heat resistance is used only in the side having the bus bar holding portion 53, and a cheap general material having heat resistance is used in the other side not having the bus bar holding portion 53, thereby reducing the manufacturing cost of the protector 50.

[0077] <Other Implementation Methods> (1) In the above embodiment, the assembly member 60 has the first protrusion 61 and the second protrusion 71, the first unit 50A has the first through hole 55A, and the second unit 50B has the second through hole 55B, but the present invention is not limited thereto. For example, the assembly member may have the first through hole and the second through hole, the first unit may have the first protrusion, and the second unit may have the second protrusion. (2) In the above embodiment, the assembly member 60 is a cover, but the present invention is not limited thereto, and the assembly member may be a member having a different purpose from the cover. Description of Reference Numerals

[0078] 10: Power storage module 11: Laminated battery 11L: Battery stack 12: Electrode lead 12A: Connect electrode leads 12B: Output electrode lead 13: Joint 14: Output section 15: Cabinet 15A: Bottom 15B: Top 15C: Side 20: Wiring module 30: Terminal 31: Main body 32: Connection 34: Wire connection 40: Busbar 40A: Part 1 40B: Part 2 41: Busbar side connection 41A: Through hole 50: Protector 50A: Unit 1 50AS: front surface 50B: Unit 2 50BS: front surface 51: Sliding structure 51A: convex part 51B: concave part 52: Electrode storage recess 52A: Connection electrode storage recess 52B: Output electrode storage recess 53: Bus bar holding part 53A: Bolt fastening part 54: Terminal storage part 55A: 1st through hole 55B: Second through hole 55C: 3rd through hole 56: Lay out the recess 60: Assembling components 60S: rear surface 61: The first protrusion 62: The 1st extension department 63: 1st diameter expansion part 64: 1st column 64A: 1st contact part 65: 1st beam 66: 1st flexure 66A: 1st stopper 66B: 1st flexure space 71: The second protrusion 72: Second extension department 73: Second diameter expansion part 74: Second Pillar 74A: Second contact portion 75: Second beam 76: 2nd flexure 76A: Second stopper 76B: Second Flexure Space 81: The third protrusion CL1: 1st clearance CL1A: First gap on the right CL1B: 1st gap on the left CL2: 2nd clearance CL2A: 2nd gap on the right CL2B: 2nd gap on the left CL3: 3rd clearance CL3A: The third gap on the upper side CL3B: 3rd gap on the lower side CL4: 4th clearance CL4A: 4th gap on the upper side CL4B: 4th gap on the lower side

Claims

1. A wiring module mounted on a battery stack, wherein the battery stack is formed by stacking a plurality of storage elements having electrode terminals, the wiring module comprising: a plurality of conductive members electrically connected to the electrode terminals; a protector including a first unit and a second unit separate from the first unit, and holding the plurality of conductive members; and Assemble components, The first unit and the second unit are connected to each other so as to be slidable in a stacking direction of the storage elements. The assembly member is assembled to both the first unit and the second unit in a first direction orthogonal to the stacking direction. The first unit, the second unit, and the assembly member each have opposing surfaces. The facing surface of the first unit and the facing surface of the assembly member face each other in the first direction, The facing surface of the second unit and the facing surface of the assembly member face each other in the first direction, One of the first unit and the assembly member includes a first protrusion protruding from the opposing surface toward the first direction. A first through hole is formed in the other of the first unit and the assembly member, and the first protrusion is inserted through the first through hole. One of the second unit and the assembly member includes a second protrusion protruding from the opposing surface toward the first direction. A second through hole is formed in the other of the second unit and the assembly member, and the second protrusion is inserted through the second through hole. The first protrusion includes a first contact portion facing the inner wall of the first through hole in the stacking direction. A first gap is set between the first contact portion and the inner wall of the first through hole.

2. The wiring module according to claim 1, wherein: The assembly member includes the first protrusion and the second protrusion, The first through hole is formed in the first unit, The second through hole is formed in the second unit.

3. The wiring module according to claim 1 or claim 2, wherein: The second protrusion includes a second contact portion disposed opposite to the inner wall of the second through hole in the stacking direction. A second gap is set between the second abutting portion and the inner wall of the second through hole, The second gap is smaller than the first gap.

4. The wiring module according to claim 1 or claim 2, wherein: The first protrusion includes a first extension portion and a first diameter-enlarged portion, the first extension portion extending from the opposing surface toward the first direction, the first diameter-enlarged portion being disposed at a top end of the first extension portion and protruding from the first extension portion toward a direction orthogonal to the first direction, The first diameter-enlarged portion includes a first locking portion that is locked with a hole edge portion of the first through hole in the first direction. The second protrusion includes a second extension portion and a second diameter-enlarged portion, the second extension portion extending from the opposing surface toward the first direction, the second diameter-enlarged portion being disposed at a top end of the second extension portion and protruding from the second extension portion toward a direction orthogonal to the first direction, The second expanded diameter portion includes a second locking portion that is locked with a hole edge portion of the second through hole in the first direction.

5. The wiring module according to claim 4, wherein: A direction orthogonal to both the first direction and the stacking direction is a second direction, A dimension of the first through hole in the second direction is smaller than a dimension of the first through hole in the stacking direction.

6. The wiring module according to claim 5, wherein: The first expanded diameter portion protrudes from the first extended portion in the second direction, and is arranged on the inner side of the first extended portion in the stacking direction.

7. The wiring module according to claim 6, wherein: The first diameter-enlarged portion is a pair of first bending pieces extending from the first extended portion to both sides in the second direction. The pair of first flexible pieces can be elastically deformed in the second direction.

8. The wiring module according to claim 7, wherein: The first protrusion has a first bending space between the pair of first bending pieces, which allows the pair of first bending pieces to bend.

9. The wiring module according to claim 1 or claim 2, wherein: The plurality of conductive members include bus bars, Only one of the first unit and the second unit includes a bus bar holding portion that holds the bus bar.

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