Wiring Module

Abstract

To provide a wiring module that can easily suppress protrusion of a wire from a wire accommodation part.SOLUTION: A wiring module 20 is attached to a battery multilayer body 11L formed by stacking a plurality of power storage elements including electrode terminals and includes a wire 45, and a protector 50 having a groove-like shape extending in a first direction and including a wire accommodation part 60 that accommodates the wire 45. The wire accommodation part 60 includes a bottom wall 61, a pair of side walls 62 rising from both side edges of the bottom wall 61 and facing each other in a second direction that is orthogonal to the first direction, and at least one engagement piece 63 extending from one of the pair of side walls 62 toward the other of the pair of side walls 62 and suppressing the protrusion of the wire 45 from the wire accommodation part 60. The engagement piece 63 includes a base end part 64 connected to the one of the pair of side walls 62 and a tip end part 65 disposed on the other side of the pair of side walls 62. A length L1 of the base end part 64 in the first direction is larger than a length L2 of the wire accommodation part 60 in the second direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] High-voltage battery packs used in electric vehicles, hybrid vehicles, and the like typically have a large number of stacked battery cells electrically connected in series or parallel by a wiring module. A known example of such a wiring module is described in Japanese Patent Laid-Open Publication No. 2013-16382 (Patent Document 1 below). The battery wiring module described in Patent Document 1 includes a plurality of connection members that connect the electrode terminals of the cells, voltage detection terminals connected to each connection member, electric wires connected to the voltage detection terminals, and a housing member made of synthetic resin that houses the connection members, voltage detection terminals, and electric wires. The electric wires are passed through a wire-passing portion that is grooved in the housing member. The wire-passing portion is provided with a pair of claws for holding the electric wires within the wire-passing portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-16382 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above configuration, the electric wires are passed through the wire-passing portion that opens upward and are held down from above by a pair of claws. However, because the claws are small relative to the size of the electric wire-passing portion, the electric wires may protrude from the opening of the electric wire-passing portion that is not covered by the claws. Such electric wires protruding from the wire-passing portion may be damaged, for example, when a housing or the like is assembled to the battery wiring module from the outside. [Means for solving the problem]

[0005] The wiring module of the present disclosure is a wiring module attached to a battery stack formed by stacking a plurality of storage elements each having an electrode terminal, and includes: an electric wire; and a protector having a groove-shaped wire accommodating portion that extends in a first direction and accommodates the electric wire. The wire accommodating portion includes a bottom wall; a pair of side walls that rise from both side edges of the bottom wall and face each other in a second direction that is perpendicular to the first direction; and at least one locking piece that extends from one of the pair of side walls to the other of the pair of side walls and prevents the electric wire from coming out of the wire accommodating portion. The locking piece has a base end connected to one of the pair of side walls and a tip end located on the other side of the pair of side walls, and the dimension of the base end in the first direction is larger than the dimension of the wire accommodating portion in the second direction. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to provide a wiring module that can easily prevent electric wires from protruding from an electric wire housing portion. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a wiring module according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is an enlarged perspective view of the protector showing the periphery of the electric wire housing portion. [Figure 4] FIG. 4 is a perspective view of the front of the battery stack. [Figure 5] FIG. 5 is a perspective view showing the main parts of a laminated battery. 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 battery stack formed by stacking a plurality of energy storage elements each having an electrode terminal, and includes: an electric wire; and a protector having a groove-shaped wire accommodating portion extending in a first direction and accommodating the electric wire. The wire accommodating portion includes a bottom wall; a pair of side walls rising from both side edges of the bottom wall and facing each other in a second direction perpendicular to the first direction; and at least one locking piece extending from one of the pair of side walls toward the other of the pair of side walls and preventing the electric wire from coming out of the wire accommodating portion. The locking piece has a base end connected to one of the pair of side walls and a tip end disposed on the other side of the pair of side walls, and the dimension of the base end in the first direction is larger than the dimension of the wire accommodating portion in the second direction.

[0010] According to this configuration, the base end portion is elongated in the first direction, so that the electric wire can be easily locked by the locking piece.

[0011] (2) It is preferable that the maximum dimension of the locking piece in the second direction is larger than half the dimension of the electric wire receiving portion in the second direction.

[0012] According to this configuration, the locking piece is elongated in the second direction, so that the electric wire can be more easily locked by the locking piece.

[0013] (3) It is preferable that the dimension of the locking piece in the first direction decreases from the base end toward the tip end.

[0014] This configuration facilitates the operation of accommodating the electric wires in the electric wire accommodating portion.

[0015] (4) It is preferable that the minimum dimension between the tip portion and the other of the pair of side walls is smaller than the outer diameter of the electric wire.

[0016] With this configuration, it is possible to prevent the electric wire from slipping out of the electric wire housing portion.

[0017] (5) The other of the pair of side walls preferably has an opposing end portion facing the tip portion and a recessed portion recessed toward the bottom wall from the opposing end portion.

[0018] According to this configuration, the recessed portion makes it easier to accommodate the electric wires in the electric wire accommodating portion.

[0019] (6) It is preferable that the wire accommodating section has a plurality of the locking pieces, the pair of side walls being composed of a first side wall and a second side wall, and the plurality of locking pieces having a first locking piece extending from the first side wall and a second locking piece extending from the second side wall.

[0020] According to this configuration, by providing a first locking piece extending from the first side wall and a second locking piece extending from the second side wall, it is possible to further prevent the electric wire from jumping out of the electric wire accommodating portion.

[0021] (7) It is preferable that the first locking pieces and the second locking pieces are alternately arranged in the first direction.

[0022] According to this configuration, the first locking pieces and the second locking pieces are arranged alternately, which further prevents the electric wire from jumping out of the electric wire accommodating portion.

[0023] [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.

[0024] <Embodiment> An embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. An energy storage module 10 including a wiring module 20 of this embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle and used as a drive source for the vehicle. In the following description, when multiple identical components are used, only some of the components may be designated by reference numerals, and the reference numerals for other components may be omitted. In the following description, the direction indicated by arrow X is the forward direction, the direction indicated by arrow Y is the leftward direction, and the direction indicated by arrow Z is the upward direction. In this embodiment, the left-right direction is an example of a first direction, and the up-down direction is an example of a second direction.

[0025] [Battery stack] The energy storage module 10 includes a battery stack 11L shown in FIG. 4 and a wiring module 20 attached to the battery stack 11L as shown in FIG.

[0026] [Laminated battery, electrode lead] As shown in FIG. 4, the battery stack 11L is composed of multiple (18 in this embodiment) laminated batteries 11 (an example of an energy storage element) stacked in the stacking direction (left-right direction). Note that FIG. 4 shows only the front portion of the battery stack 11L. As shown in FIG. 5, the laminated battery 11 is long in the front-rear direction and flat in the left-right direction. An energy storage element (not shown) is housed 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-rear direction, protruding in opposite directions. The pair of electrode leads 12 are plate-shaped and have opposite polarities.

[0027] As shown in FIG. 4 , the battery stack 11L has a joint 13 electrically connecting the four electrode leads 12 of the laminated batteries 11 arranged in succession in the left-right direction. Specifically, the four electrode leads 12 are bent to the left or right at approximately right angles, overlapped, and joined by laser welding to form the joint 13. The electrode leads 12 that form the joint 13 are connection electrode leads 12A. Of the four connection electrode leads 12A, the two connection electrode leads 12A on the right side have opposite polarities to the two connection electrode leads 12A on the left side. For example, the two connection electrode leads 12A on the right side are positive electrodes, and the two connection electrode leads 12A on the left side are negative electrodes. Therefore, in the battery stack 11L, the joint 13 connects two laminated batteries 11 that are connected in parallel in series. The battery stack 11L has four joints 13 at its front. Although not shown, the battery stack 11L also has four joints 13 at its rear.

[0028] The battery stack 11L has an output section 14 at the left end of its front section. Although not shown, the battery stack 11L also has an output section 14 at the right end of its rear section. The output section 14 is formed by joining two of the electrode leads 12 that do not form a joint 13. The electrode lead 12 that forms the output section 14 is designated as an output electrode lead 12B. The two output electrode leads 12B that form one output section 14 have the same polarity. The output section 14 forms the positive or negative electrode of the entire battery stack 11L. That is, for example, if the front output section 14 is the overall positive electrode of the battery stack 11L, the rear output section 14 is the overall negative electrode of the battery stack 11L.

[0029] [Wiring module] 1 , the wiring module 20 of this embodiment includes a terminal 30 connected to the connection electrode lead 12A, a bus bar 40 connected to the output electrode lead 12B, an electric wire 45 connected to the terminal 30, and a protector 50 that holds the terminal 30, the bus bar 40, and the electric wire 45. The configuration of the wiring module 20 arranged on the front side of the power storage module 10 will be described in detail below. Although not shown, the wiring module 20 arranged on the rear side of the power storage module 10 is configured similarly to the wiring module 20 arranged on the front side of the power storage module 10.

[0030] The busbar 40 has a plate-like shape and is formed by processing a conductive metal plate. As shown in FIG. 1 , the busbar 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 flattened in the front-rear direction. The second portion 40B extends rightward from the upper end of the first portion 40A and is also flattened in the vertical direction. The busbar 40 is held by a busbar holding portion 53 of the protector 50 and is connected to the output electrode lead 12B at the vertical center of the first portion 40A. A busbar-side connection portion 41 is provided at the right end of the second portion 40B.

[0031] Although not shown, the busbar side connection portion 41 has an insertion hole through which a bolt is inserted. An external connection terminal (not shown) is placed on top of the busbar side connection portion 41 and is fastened to the busbar side connection portion 41 with a bolt. In this way, the busbar side connection portion 41 is electrically connected to the external connection terminal. The external connection terminal is used to connect the energy storage module 10 to an external device (not shown).

[0032] The terminal 30 is formed by processing a conductive metal plate. As shown in FIG. 1 , the terminal 30 includes a main body 31, a connection portion 32 extending rightward from the main body 31, and an electric wire connection portion 34 extending upward from the main body 31. The main body 31 is accommodated and held in a terminal accommodating portion 54 of the protector 50. The connection portion 32 is adapted to be connected in surface contact with the joint 13 or a portion of the connection electrode lead 12A constituting the joint 13. In other words, the terminal 30 is not a member for connecting adjacent connection electrode leads 12A, but a member for connecting a pre-connected connection electrode lead 12A (joint 13) to an electric wire 45. The electric wire connection portion 34 has a crimping piece that is crimped to the electric wire 45.

[0033] [Electric wire] One end of the electric wire 45 is connected to the terminal 30. Although not shown in FIG. 1, the other end of the electric wire 45 is connected to an external ECU (Electronic Control Unit) or the like via a connector or the like. The ECU is equipped with a microcomputer, elements, etc., and has a well-known configuration with functions such as detecting the voltage, current, temperature, etc. of each laminated battery 11 and controlling the charge and discharge of each laminated battery 11. In other words, the electric wire 45 in this embodiment is a so-called voltage detection wire. The electric wire 45 is arranged inside the electric wire housing portion 60 and branch wiring portion 55 of the protector 50.

[0034] [Protector] The protector 50 is made of insulating synthetic resin and has a plate shape. As shown in FIG. 1, the protector 50 includes a protector body 51 that is positioned relative to the battery stack 11L. Electrode accommodating recesses 52 are provided in the vertical center of the protector body 51, aligned in the left-right direction. The electrode accommodating recesses 52 are formed to penetrate in the front-to-rear direction and have a rectangular shape that is long in the vertical direction. The electrode accommodating recess 52 is composed of a connection electrode accommodating recess 52A that accommodates the joint portion 13 and the connection electrode lead 12A, and an output electrode accommodating recess 52B that accommodates the output electrode lead 12B and the output portion 14.

[0035] Busbar holding portions 53 for holding busbar 40 are provided on the upper and lower sides of output electrode accommodating recess 52B. A bolt fastening portion 53A for fastening busbar 40 with a bolt is provided on the right side of upper busbar holding portion 53. A terminal accommodating portion 54 for accommodating a part of terminal 30 is provided diagonally below and to the left of connection electrode accommodating recess 52A.

[0036] On the right side of the connection electrode accommodating recess 52A, a branch wiring portion 55 is formed recessed rearward from the protector body 51. The branch wiring portion 55 has a groove shape extending in the vertical direction. The branch wiring portion 55 includes a groove bottom wall 55A, a pair of groove side walls 55B extending forward from both left and right side edges of the groove bottom wall 55A, and a pair of locking claws 55C extending toward each other from the front ends of the pair of groove side walls 55B. The branch wiring portion 55 communicates with the terminal accommodating portion 54 at its lower end. The branch wiring portion 55 communicates with the electric wire accommodating portion 60 at its upper end. The pair of locking claws 55C press the electric wire 45 from above, preventing the electric wire 45 from slipping out of the branch wiring portion 55.

[0037] [Wire housing section] An electric wire accommodating portion 60 is formed on the upper side of the protector 50, recessed rearward from the protector body 51. The electric wire accommodating portion 60 has a groove shape extending in the left-right direction. As shown in FIG. 3 , the electric wire accommodating portion 60 includes a bottom wall 61, a pair of side walls 62 extending forward from both vertical edge portions of the bottom wall 61, and a plurality of locking pieces 63 extending from the front end portions of the side walls 62. The pair of side walls 62 face each other in the up-down direction. Of the pair of side walls 62, the upper side wall 62 is a first side wall 62A, and the lower side wall 62 is a second side wall 62B.

[0038] [Lock piece] The locking pieces 63 are formed in a substantially isosceles triangle shape when viewed from the opening direction (front) of the wire accommodating portion 60. Of the multiple locking pieces 63, the locking pieces 63 extending from the first side wall 62A are referred to as first locking pieces 63A, and the locking pieces 63 extending from the second side wall 62B are referred to as second locking pieces 63B. The first locking pieces 63A extend downward from the first side wall 62A toward the second side wall 62B. The second locking pieces 63B extend upward from the second side wall 62B toward the first side wall 62A. That is, the locking pieces 63 extend from one of the pair of side walls 62 toward the other of the pair of side walls 62. As shown in FIG. 1 , the locking pieces 63 are arranged to cover the electric wires 45 in the wire accommodating portion 60 from the front, preventing the electric wires 45 from coming out of the wire accommodating portion 60.

[0039] [Proximal end, distal end] 3, the locking piece 63 extending from one of the pair of side walls 62 includes a base end 64 connected to one of the pair of side walls 62 and a tip end 65 which is the end on the other side of the pair of side walls 62. Specifically, the base end 64 of the first locking piece 63A is the upper portion of the first locking piece 63A, and the tip end 65 of the first locking piece 63A is the lower end of the first locking piece 63A. The base end 64 of the second locking piece 63B is the lower portion of the second locking piece 63B, and the tip end 65 of the second locking piece 63B is the upper end of the second locking piece 63B.

[0040] [Opposite ends] A tip 65 of the locking piece 63 extending from one of the pair of side walls 62 faces an opposing end 66 located closest to the tip 65 on the other of the pair of side walls 62. The opposing end 66 is located at the front end of the side wall 62, i.e., at the end in the opening direction of the wire accommodating section 60. As shown in FIG. 2 , a dimension L4 between the tip 65 and the opposing end 66 (i.e., the minimum dimension between the tip 65 and the opposing side wall 62) is set smaller than the outer diameter D1 of the electric wire 45. This makes it difficult for the electric wire 45 to slip out of the wire accommodating section 60. When accommodating the electric wire 45 in the wire accommodating section 60, for example, the locking piece 63 is bent in the front-rear direction or the side wall 62 is bent in the up-down direction to widen the gap between the tip 65 and the opposing end 66. This allows the electric wire 45 to be passed between the tip portion 65 and the opposing end portion 66 and introduced into the electric wire accommodating portion 60.

[0041] 1 , a dimension L1 in the left-right direction of the base end 64 is larger than a dimension L2 in the up-down direction of the wire accommodating portion 60. Furthermore, a maximum dimension L3 in the up-down direction of the locking piece 63 (in the embodiment, the dimension in the up-down direction from the base end 64 to the tip end 65) is larger than half the dimension L2 in the up-down direction of the wire accommodating portion 60. By forming the locking piece 63 with such dimensions, the size of the locking piece 63 relative to the wire accommodating portion 60 is increased, making it easier to prevent the wire 45 from protruding from the wire accommodating portion 60.

[0042] The locking piece 63 is formed to narrow in the left-right direction from the base end 64 toward the tip end 65. In other words, the left-right dimension of the locking piece 63 becomes smaller from the base end 64 toward the tip end 65. This makes it easier to store the electric wire 45 in the wire storing portion 60 because the area between the tip end 65 and the opposing end 66 becomes smaller in the left-right direction.

[0043] 3, the wire accommodating portion 60 includes a first locking piece 63A and a second locking piece 63B extending in opposite directions. This makes it possible to easily prevent the wire 45 from coming out of the wire accommodating portion 60 even when the wire 45 is placed in the wire accommodating portion 60 close to one of the pair of side walls 62 (see FIG. 1). Furthermore, since the first locking pieces 63A and the second locking pieces 63B are arranged alternately in the left-right direction in the wire accommodating portion 60, it is even easier to prevent the wire 45 from coming out of the wire accommodating portion 60.

[0044] Furthermore, the locking pieces 63 narrow in the left-right direction from the base end 64 to the tip end 65, and the first locking pieces 63A and the second locking pieces 63B are arranged alternately in the left-right direction, so it is possible to set the interval between adjacent locking pieces 63 small. As a result, it is easy to reduce the forward opening of the wire accommodating portion 60. Therefore, it is even easier to prevent the wires 45 from jumping out of the wire accommodating portion 60.

[0045] Recess 3, recesses 67 recessed toward the bottom wall 61 (rear side) are formed on both the left and right sides of the opposing end 66 in the side wall 62. By providing the recesses 67, when the electric wire 45 is accommodated in the electric wire accommodating portion 60, the electric wire 45 can be easily passed between the tip end 65 and the opposing end 66 without having to bend the locking piece 63 significantly.

[0046] The second side wall 62B has a communication portion 68 recessed toward the bottom wall 61 (rear side). The communication portion 68 connects the branch wiring portion 55 and the electric wire accommodating portion 60. The plurality of electric wires 45 in the electric wire accommodating portion 60 are branched and routed to each branch wiring portion 55 via the communication portion 68.

[0047] [Effects of the embodiment] According to the embodiment, the following actions and effects are achieved. The wiring module 20 according to the embodiment is a wiring module 20 attached to a battery stack 11L formed by stacking a plurality of power storage elements (laminated batteries 11) each having an electrode terminal (electrode lead 12), and includes an electric wire 45 and a protector 50 having a groove-shaped electric wire housing portion 60 extending in a first direction (left-right direction) and housing the electric wire 45. The electric wire housing portion 60 has a bottom wall 61 and grooves extending from both side edges of the bottom wall 61 and extending in a second direction ( and at least one locking piece 63 extending from one of the pair of side walls 62 to the other of the pair of side walls 62 and preventing the electric wire 45 from coming out of the electric wire accommodating section 60, wherein the locking piece 63 has a base end 64 connected to one of the pair of side walls 62 and a tip end 65 arranged on the other side of the pair of side walls 62, and a dimension L1 of the base end 64 in the first direction is larger than a dimension L2 of the electric wire accommodating section 60 in the second direction.

[0048] According to this configuration, the base end portion 64 is elongated in the first direction, so that the electric wire 45 can be easily locked by the locking piece 63.

[0049] In the embodiment, the maximum dimension L3 of the locking piece 63 in the second direction is larger than half the dimension L2 of the wire accommodating portion 60 in the second direction.

[0050] According to this configuration, the locking piece 63 is elongated in the second direction, so that the wire 45 can be locked by the locking piece 63 more easily.

[0051] In this embodiment, the dimension of the locking piece 63 in the first direction decreases from the base end 64 toward the tip end 65.

[0052] With this configuration, the operation of accommodating the electric wires 45 in the electric wire accommodating portion 60 becomes easy.

[0053] In this embodiment, the minimum dimension L4 between the tip portion 65 and the other of the pair of side walls 62 is smaller than the outer diameter D1 of the electric wire 45.

[0054] With this configuration, the wires 45 can be prevented from slipping out of the wire accommodating portion 60 .

[0055] In this embodiment, the other of the pair of side walls 62 includes an opposing end 66 that faces the tip portion 65 and a recess 67 that is recessed toward the bottom wall 61 from the opposing end 66 .

[0056] According to this configuration, the recess 67 makes it easier to accommodate the wire 45 in the wire accommodating portion 60 .

[0057] In the embodiment, the wire accommodating section 60 has a plurality of locking pieces 63, and the pair of side walls 62 is composed of a first side wall 62A and a second side wall 62B, and the plurality of locking pieces 63 has a first locking piece 63A extending from the first side wall 62A and a second locking piece 63B extending from the second side wall 62B.

[0058] With this configuration, the provision of the first locking piece 63A extending from the first side wall 62A and the second locking piece 63B extending from the second side wall 62B further prevents the wire 45 from jumping out of the wire accommodating section 60.

[0059] In this embodiment, the first locking pieces 63A and the second locking pieces 63B are arranged alternately in the first direction.

[0060] According to this configuration, the first locking pieces 63A and the second locking pieces 63B are alternately arranged, so that the wires 45 can be further prevented from jumping out of the wire accommodating portion 60.

[0061] <Other embodiments> (1) In the above embodiment, the locking piece 63 has a substantially isosceles triangle shape when viewed from the opening direction of the wire accommodating portion 60, but this is not limited to this. The shape of the locking piece when viewed from the opening direction of the wire accommodating portion may be, for example, a triangle other than an isosceles triangle, a square, a semicircle, a semiellipse, or the like. (2) In the above embodiment, the wire housing 60 is configured to open forward, but this is not limitative, and the direction in which the wire housing opens can be set arbitrarily. (3) In the above embodiment, the wire housing 60 is configured to house a plurality of wires 45. However, this is not limited thereto, and the wire housing may be configured to house a single wire. For example, the branch wiring portion may be configured in the same manner as the wire housing portion. (4) In the above embodiment, the electric wire 45 accommodated in the electric wire accommodating section 60 was a voltage detection wire, but this is not limited to this. For example, the electric wire accommodated in the electric wire accommodating section may be connected to a thermistor for measuring the temperature of the storage element. [Explanation of symbols]

[0062] 10: Energy storage module 11: Laminated battery 11L: Battery stack 12: Electrode lead 12A: Connecting electrode lead 12B: Output electrode lead 13: Joint 14: Output section 20: Wiring module 30: Terminal 31: Main body 32: Connection 34: Wire connection 40: Busbar 40A: 1st part 40B: 2nd part 41: Busbar side connection 45: Electric wire 50: Protector 51: Protector body 52: Electrode receiving recess 52A: Connection electrode receiving recess 52B: Output electrode receiving recess 53: Busbar holder 53A: Bolted joint 54: Terminal housing 55: Branch wiring section 55A: Groove bottom wall 55B: Groove side wall 55C: Locking claw 60: Wire housing 61: Bottom wall 62: Side wall 62A: 1st side wall 62B: Second side wall 63: Locking piece 63A: 1st locking piece 63B: Second locking piece 64: Proximal end 65: Tip 66: Opposite ends 67: Recess 68: Communication part D1: Outer diameter of the wire L1: Dimension in the left-right direction of the base end L2: Vertical dimension of the wire receiving section L3: Maximum dimension of the locking piece in the vertical direction L4: Dimension between the tip and the opposite end

Claims

1. A wiring module attached to a battery stack configured by stacking a plurality of storage elements each having an electrode terminal, a protector including an electric wire and a groove-shaped electric wire housing portion extending in a first direction, the electric wire being housed therein; the wire accommodating portion includes a bottom wall, a pair of side walls rising from both side edges of the bottom wall and facing each other in a second direction perpendicular to the first direction, and at least one locking piece extending from one of the pair of side walls toward the other of the pair of side walls and preventing the wire from coming out of the wire accommodating portion, the locking piece has a base end connected to one of the pair of side walls and a tip end disposed on the other side of the pair of side walls, The wiring module, wherein the dimension of the base end portion in the first direction is larger than the dimension of the wire accommodating portion in the second direction.

2. The wiring module according to claim 1 , wherein the maximum dimension of the locking piece in the second direction is greater than half the dimension of the wire accommodating portion in the second direction.

3. 3. The wiring module according to claim 1, wherein the dimension of the locking piece in the first direction decreases from the base end portion to the tip end portion.

4. 3. The wiring module according to claim 1, wherein a minimum dimension between the tip portion and the other of the pair of side walls is smaller than an outer diameter of the electric wire.

5. 3 . The wiring module according to claim 1 , wherein the other of the pair of side walls has an opposing end portion that faces the tip portion, and a recess that is recessed toward the bottom wall from the opposing end portion.

6. The wire accommodating portion includes a plurality of the locking pieces, the pair of side walls are composed of a first side wall and a second side wall, 3. The wiring module according to claim 1, wherein the plurality of locking pieces include a first locking piece extending from the first side wall and a second locking piece extending from the second side wall.

7. The wiring module according to claim 6 , wherein the first locking pieces and the second locking pieces are alternately arranged in the first direction.

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