WO2024128033A1 - Wiring module - Google Patents

Abstract

A wiring module 20 is to be attached to a plurality of power storage elements 11 having electrode terminals, and comprises: a plurality of bus bars 30; a plurality of circuit boards; a plurality of wires 40; and a protector 50 that holds the plurality of bus bars 30, the plurality of circuit boards, and the plurality of wires 40. The bus bars 30 are respectively connected to the electrode terminals. The circuit boards are respectively electrically connected to the bus bars 30. The wires 40 are respectively connected to the circuit boards. The protector 50 has: a wire accommodation part 52 that accommodates therein the plurality of wires 40; a placement surface 54 which can come into contact with the wires 40 disposed outside the wire accommodation part 52, and on which the circuit boards are placed; and a contact part 58 which can come into contact with the wires 40 disposed outside the wire accommodation part 52 from the opposite side to the placement surface 54 in a first direction orthogonal to the placement surface 54.

Description

Wiring Module

This disclosure relates to a wiring module.

High-voltage battery packs used in electric vehicles, hybrid vehicles, etc. usually consist of multiple stacked batteries that are electrically connected in series or parallel by a wiring module. A battery connection module described in JP 2019-23996 A (Patent Document 1 below) is known as such a wiring module. The battery connection module described in Patent Document 1 is configured with a bus bar and a flexible circuit board connected to the bus bar.

JP 2019-23996 A

In contrast to the above configuration, the wiring module may include a bus bar, a circuit board connected to the bus bar, and electric wires connected to the circuit board. The connection between the circuit board and the electric wires may be performed, for example, by soldering. In such a layout module, the connection between the circuit board and the electric wires may be damaged, for example, when vibration or stress is applied to the electric wires.

The wiring module of the present disclosure is a wiring module that is attached to a plurality of energy storage elements having electrode terminals, and includes a plurality of bus bars, a plurality of circuit boards, a plurality of electric wires, and a protector that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of electric wires, where each of the bus bars is connected to the electrode terminal, each of the circuit boards is electrically connected to each of the bus bars, and each of the electric wires is connected to each of the circuit boards, and the protector has a wire accommodating section that accommodates the plurality of electric wires, a mounting surface on which each of the circuit boards is mounted, and a contact portion that is capable of contacting each of the electric wires arranged outside the wire accommodating section from the side opposite the mounting surface in a first direction perpendicular to the mounting surface.

This disclosure provides a wiring module that can reduce damage to the connection between the circuit board and the electric wire.

FIG. 1 is a schematic diagram showing a vehicle equipped with a power storage module according to a first embodiment. FIG. 2 is a plan view of the wiring module and the energy storage element. FIG. 3 is a plan view of the wiring module and the energy storage element with the cover removed. FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 5 is a cross-sectional view taken along line BB of FIG. FIG. 6 is an enlarged perspective view of the wiring module, illustrating the electric wires arranged outside the electric wire receiving portion and disposed within the recessed portion. FIG. 7 is a perspective view of the cover showing the contact portion. FIG. 8 is an enlarged plan view of the wiring module according to the second embodiment. FIG. 9 is a cross-sectional view taken along the line CC of FIG. FIG. 10 is a cross-sectional view taken along line DD of FIG. FIG. 11 is an enlarged perspective view of the wiring module showing the electric wires arranged outside the electric wire receiving portion. FIG. 12 is a perspective view of the cover showing the elastic piece.

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

(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 plurality of bus bars, a plurality of circuit boards, a plurality of electric wires, and a protector that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of electric wires, where each of the bus bars is connected to the electrode terminal, each of the circuit boards is electrically connected to each of the bus bars, and each of the electric wires is connected to each of the circuit boards, and the protector has a wire housing portion in which the plurality of electric wires are housed, a mounting surface on which each of the circuit boards is mounted, and a contact portion that is capable of contacting each of the electric wires arranged outside the wire housing portion from the opposite side to the mounting surface in a first direction perpendicular to the mounting surface. Note that orthogonal here also includes an intersection that is recognized as being substantially orthogonal.

With this configuration, when vibrations are applied to the multiple electric wires, each electric wire arranged outside the electric wire housing section comes into contact with the mounting surface and the contact section, and is subjected to friction from the mounting surface and the contact section. This makes it difficult for vibrations to be transmitted to the connections between each electric wire and each circuit board. Therefore, damage to the connections between each electric wire and each circuit board can be suppressed.

(2) In the wiring module described in (1), it is preferable that the protector comprises a protector body and a cover that is overlapped with the protector body in the first direction, the protector body comprises the mounting surface described above, and the cover comprises the contact portion.

This configuration allows the contact parts to be easily installed. It also makes it easier to route each electric wire to the protector.

(3) In the wiring module described in (1) or (2), it is preferable that the protector has a recess recessed from the mounting surface, and the contact portion overlaps the recess when viewed from the first direction.

With this configuration, each electric wire arranged outside the electric wire housing can be bent and placed inside the recess, and the contact portion can be pressed against each electric wire. This increases friction between the contact portion and each electric wire, further reducing damage to the connection portion between each electric wire and each circuit board.

(4) In the wiring module described in (3), it is preferable that the distance in the first direction between the bottom surface of the recess and the contact portion is set to be larger than the diameter of each of the electric wires.

With this configuration, if the distance in the first direction between the bottom surface of the recess and the contact portion becomes small due to manufacturing tolerances of the protector, etc., it is possible to prevent each electric wire from being pinched between the bottom surface of the recess and the contact portion and being damaged.

(5) In the wiring module described in (1) or (2), it is preferable that the protector is elastically deformable in the first direction and has an elastic piece having the contact portion, and the elastic piece clamps each of the electric wires between the mounting surface.

With this configuration, each electric wire arranged outside the electric wire housing is clamped between the elastic piece and the mounting surface, which increases the friction between each electric wire and the mounting surface and the contact portion. This further reduces damage to the connection between each electric wire and each circuit board.

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

<Embodiment 1>
A first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 7. 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 a 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, for multiple identical members, reference numerals may be assigned to only some of the members, and the reference numerals of the other members may be omitted.

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

As shown in FIG. 2, the energy storage module 10 comprises a number of energy storage elements 11 arranged in a row, and a wiring module 20 attached to the upper surfaces of the multiple energy storage elements 11. The energy storage elements 11 are in the form of a flattened rectangular parallelepiped with energy storage elements housed inside. Although not shown, the energy storage elements 11 have a pair of electrode terminals located near the right end and the left end of the upper surface. One of the pair of electrode terminals is a positive electrode, and the other is a negative electrode.

[Wiring module]
The wiring module 20 comprises a bus bar 30 connected to the electrode terminal of the storage element 11, a circuit board 21 connected to the bus bar 30, an electric wire 40 connected to the circuit board 21, and a protector 50 that holds the bus bar 30, the circuit board 21, and the electric wire 40.

[Busbar]
The busbar 30 is made of a metal plate material and has a rectangular shape in a plan view. The busbar 30 includes a connection busbar 30A that connects between adjacent electrode terminals in the stacking direction (front-rear direction) of the multiple energy storage elements 11, and an output busbar 30B that is connected to the electrode terminal of the energy storage element 11 arranged at the end in the stacking direction. The output busbar 30B connects the total positive electrode or total negative electrode of the multiple energy storage elements 11 to an external device. The busbar 30 is connected to the electrode terminal by welding or the like. The busbar 30 is accommodated in a busbar accommodating portion 51 of a protector 50 described later.

[Circuit board]
In this embodiment, the circuit board 21 is a flexible board, and is configured by forming a conductive path on the surface of a flexible insulating sheet by a printed wiring technology. The circuit board 21 includes a board body 22 and an extension portion 23 extending from the board body 22. The board body 22 has a substantially rectangular shape in a plan view. The board body 22 is fixed to a mounting surface 54 of a protector 50 described later. Although not shown in detail, for example, the board body 22 is provided with an insertion hole, and a protrusion protruding from the mounting surface 54 is inserted into the insertion hole. The board body 22 is provided with an electric wire land 22A arranged at one end of the conductive path. The electric wire land 22A is connected to the electric wire 40 by soldering or the like.

The extension portion 23 is roughly U-shaped in a plan view and is configured to be expandable and contractible. The provision of the extension portion 23 allows the end portion (tip portion) of the extension portion 23 opposite the substrate body 22 to be displaced a predetermined dimension relative to the substrate body 22. The other end of the conductive path (not shown) is disposed at the tip portion of the extension portion 23. The other end of the conductive path is electrically connected to the bus bar 30 via the metal piece 15.

Although not shown, fuses or the like may be provided in the conductive paths of the circuit board 21. In addition, the circuit board 21 may have multiple conductive paths, and the conductive paths may include part of a thermistor circuit for measuring the temperature of the storage element 11.

[Electrical wire]
The electric wires 40 connected to the circuit board 21 are collectively accommodated in an electric wire housing portion 52 of the protector 50, which will be described later. The plurality of electric wires 40 are arranged to extend in the front-rear direction in the electric wire housing portion 52. Although not shown, the plurality of electric wires 40 may be integrated in the electric wire housing portion 52 by tape, a bundling member, or the like.

The multiple electric wires 40 are connected to a connector (not shown) at the end opposite the circuit board 21. This connector is adapted to be connected to an external ECU (Electronic Control Unit) or the like. The ECU is equipped with a microcomputer, elements, etc., and is of a well-known configuration that has functions such as detecting the voltage, current, temperature, etc. of each storage element 11 and controlling the charging and discharging of each storage element 11.

[Protector]
The protector 50 is made of insulating synthetic resin. The protector 50 includes a protector body 50A and a cover 50B that covers the protector body 50A from above. In this embodiment, two covers 50B (only one cover 50B is shown in FIG. 2) are provided for one protector body 50A.

[Protector body]
The protector body 50A is in the shape of a tray. As shown in Fig. 3, the protector body 50A includes a busbar accommodating portion 51 for accommodating the busbar 30, an electric wire accommodating portion 52 for accommodating the plurality of electric wires 40, and an intermediate wiring portion 53 arranged between the busbar accommodating portion 51 and the electric wire accommodating portion 52. The busbar accommodating portions 51 are provided at both ends in the left-right direction of the protector body 50A. The busbar accommodating portions 51 are frame-shaped and arranged side by side in the front-rear direction.

[Electric wire housing section]
Two electric wire housing portions 52 are provided near the left-right center of the protector body 50A. The electric wire housing portions 52 are groove-shaped and extend in the front-rear direction. As shown in Fig. 6, the electric wire housing portion 52 includes a bottom wall 52A and a pair of side walls 52B rising upward from both left and right end edges of the bottom wall 52A. A cutout portion 52C is formed in the side wall 52B on the intermediate wiring portion 53 side of the electric wire housing portion 52. The electric wire 40 is adapted to be received from the intermediate wiring portion 53 into the electric wire housing portion 52 through the cutout portion 52C.

[Recess]
As shown in FIG. 2, the intermediate wiring portion 53 has a circuit board 21 and an electric wire 40 connected to the circuit board 21. The intermediate wiring portion 53 has a mounting surface 54 on which the circuit board 21 is mounted, and a recess 55 recessed from the mounting surface 54 toward the energy storage element 11 (downward). The mounting surface 54 is a surface perpendicular to the up-down direction (an example of a first direction). The recess 55 has a rectangular shape that is long in the left-right direction in a plan view. As shown in FIG. 6, the recess 55 is disposed near the cutout portion 52C of the electric wire accommodating portion 52. The recess 55 has a bottom surface 55A that is approximately parallel to the mounting surface 54, and a first connection surface 55B and a second connection surface 55C that are connected to both left and right end edges of the bottom surface 55A. The first connection surface 55B and the second connection surface 55C connect the bottom surface 55A and the mounting surface 54. The second connection surface 55C is disposed closer to the wire accommodating portion 52 than the first connection surface 55B. The first connection surface 55B and the second connection surface 55C are inclined downward toward the bottom surface 55A.

The intermediate wiring section 53 is disposed around the recess 55 and includes a partition wall 56 that rises upward from the mounting surface 54. The partition wall 56 is connected to the side wall 52B of the electric wire accommodating section 52. The partition wall 56 is provided with an opening 56A at a position opposite the cutout portion 52C in the left-right direction. By providing the partition wall 56 in this manner, the electric wire 40 can be inserted through the cutout portion 52C and the opening 56A, and thus positioned so that it overlaps the recess 55 in a plan view.

[Cover, contact part]
2 and 3, the cover 50B is configured to be able to close the electric wire housing portion 52 and the intermediate wiring portion 53 of the protector body 50A from above. As shown in Fig. 7, the cover 50B includes a top plate portion 57 and a contact portion 58 provided to protrude downward from the top plate portion 57. The contact portion 58 is, for example, block-shaped. The contact portion 58 is able to come into contact with the mounting surface 54 from the side opposite the mounting surface 54 in a first direction (vertical direction) perpendicular to the mounting surface 54.

When the protector body 50A is covered with the cover 50B, the contact portion 58 overlaps the recess 55 in a plan view, as shown by the dashed line in FIG. 2. As shown in FIG. 4 and FIG. 5, the contact portion 58 is arranged inside the partition wall 56, and the electric wire 40 is arranged between the contact portion 58 and the bottom surface 55A of the recess 55. It is assumed that the electric wire 40 contacts the mounting surface 54 in the area between the connection portion with the circuit board 21 and the recess 55. The contact portion 58 is also arranged to press the electric wire 40 arranged on the recess 55 toward the bottom surface 55A of the recess 55. That is, the lower end of the electric wire 40 is arranged below the mounting surface 54 in the recess 55, and the electric wire 40 is bent in the area from the outside to the inside of the recess 55. In detail, the lower end of the contact portion 58 is arranged at a position lower than the position of the upper end of the electric wire 40 placed on the mounting surface 54 in the vertical direction.

As shown in FIG. 4, in this embodiment, the recess 55 has a first connection surface 55B and a second connection surface 55C at both ends of the bottom surface 55A in the extension direction (left-right direction) of the electric wire 40. The first connection surface 55B and the second connection surface 55C are provided with a downward inclination toward the bottom surface 55A. Therefore, when the electric wire 40 is pressed into the recess 55 by the contact portion 58, the electric wire 40 is easily bent, and the electric wire 40 is less likely to be damaged at both left and right ends of the recess 55.

As shown in Figures 4 and 5, in this embodiment, the distance D1 between the contact portion 58 and the bottom surface 55A of the recess 55 is larger than the diameter R1 of the electric wire 40. This makes it possible to prevent the electric wire 40 from being pinched between the contact portion 58 and the recess 55 and being damaged, even if the manufacturing tolerances of the contact portion 58 and the recess 55 are large.

[Effect of contact area]
Since the wiring module 20 of the present embodiment is used in the vehicle 1, it is considered that vibrations are applied to the electric wires 40. In particular, when the electric wires 40 are integrated in the electric wire accommodating portion 52 with a tape or the like, the vibrations applied to each electric wire 40 may become large. In addition, the electric wires 40 are connected to a connector, and it is considered that a tensile stress is applied to the electric wires 40 when the connector is connected to an external ECU or the like.

In this embodiment, as described above, the mounting surface 54 can contact the electric wires 40 from below, and the contact portion 58 can contact the electric wires 40 from above. Therefore, when vibration or tensile stress is applied to the electric wires 40, friction occurs between the electric wires 40 and the mounting surface 54 and the contact portion 58. This friction can prevent the vibration or tensile stress applied to the multiple electric wires 40 from being transmitted to the connection portion between the electric wires 40 and the circuit board 21 arranged outside the electric wire accommodating portion 52. Therefore, even when vibration or tensile stress is applied to the multiple electric wires 40, damage to the connection portion between the electric wires 40 and the circuit board 21 can be prevented.

[Effects of the First Embodiment]
According to the first embodiment, the following actions and effects are achieved.
The wiring module 20 in the first embodiment is a wiring module 20 that is attached to a plurality of energy storage elements 11 having electrode terminals, and includes a plurality of bus bars 30, a plurality of circuit boards 21, a plurality of electric wires 40, and a protector 50 that holds the plurality of bus bars 30, the plurality of circuit boards 21, and the plurality of electric wires 40, wherein each bus bar 30 is connected to an electrode terminal, each circuit board 21 is electrically connected to each bus bar 30, and each electric wire 40 is connected to each circuit board 21, and the protector 50 has a wire accommodating section 52 in which the plurality of electric wires 40 are accommodated, a mounting surface 54 on which each circuit board 21 is placed and which is capable of contacting each electric wire 40 arranged outside the wire accommodating section 52, and a contact portion 58 which is capable of contacting each electric wire 40 arranged outside the wire accommodating section 52 from the side opposite to the mounting surface 54 in a first direction (up-down direction) perpendicular to the mounting surface 54.

With this configuration, when vibrations are applied to the multiple electric wires 40, each electric wire 40 arranged outside the electric wire accommodating section 52 comes into contact with the mounting surface 54 and the contact portion 58, and is subjected to friction from the mounting surface 54 and the contact portion 58. This makes it difficult for vibrations to be transmitted to the connection portions between each electric wire 40 and each circuit board 21. Therefore, damage to the connection portions between each electric wire 40 and each circuit board 21 can be suppressed.

In embodiment 1, the protector 50 includes a protector body 50A and a cover 50B that is overlapped with the protector body 50A in the first direction, the protector body 50A includes a mounting surface 54, and the cover 50B includes a contact portion 58.

This configuration allows the contact portion 58 to be easily provided. It also makes it easier to route each electric wire 40 to the protector 50.

In the first embodiment, the protector 50 has a recess 55 recessed from the mounting surface 54, and the contact portion 58 overlaps with the recess 55 when viewed from the first direction.

With this configuration, each electric wire 40 arranged outside the electric wire housing portion 52 can be arranged in a bent state within the recess 55, and the contact portion 58 can be pressed against each electric wire 40. This increases friction between the contact portion 58 and each electric wire 40, and further suppresses damage to the connection portion between each electric wire 40 and each circuit board 21.

In the first embodiment, the distance D1 in the first direction between the bottom surface 55A of the recess 55 and the contact portion 58 is set to be larger than the diameter R1 of each electric wire 40.

With this configuration, if the distance D1 in the first direction between the bottom surface 55A of the recess 55 and the contact portion 58 becomes small due to manufacturing tolerances of the protector 50, it is possible to prevent each electric wire 40 from being pinched between the bottom surface 55A of the recess 55 and the contact portion 58 and being damaged.

<Embodiment 2>
A second embodiment of the present disclosure will be described with reference to Fig. 8 to Fig. 12. The wiring module 120 according to the second embodiment is configured similarly to the first embodiment, except for the protector 150, and therefore descriptions of the same members and effects as those of the first embodiment will be omitted. Note that, for multiple identical members, only some of the members may be labeled with reference numerals, and the reference numerals of the other members may be omitted.

As shown in FIG. 8, the protector 150 of the wiring module 120 includes a protector body 150A and a cover 150B. As shown in FIG. 11, the intermediate wiring section 153 of the protector body 150A has a mounting surface 54, but does not have the recess 55 of embodiment 1. In addition, in the intermediate wiring section 153, the partition wall 56 is provided in the same position as in embodiment 1.

As shown in FIG. 12, the cover 150B has a top plate portion 57 and an elastic piece 160 extending from the top plate portion 57. The elastic piece 160 is elastically deformable in the up-down direction. The elastic piece 160 has a contact portion 161 in the center in the direction in which it extends (left-right direction). The contact portion 161 is in the shape of a plate extending horizontally.

When the cover 150B is attached to the protector body 150A, as shown in Figures 9 and 10, the electric wire 40 is clamped between the contact portion 161 and the mounting surface 54 arranged inside the partition wall 56. With this configuration, friction occurs between the electric wire 40 and the mounting surface 54 and the contact portion 161. Therefore, even if vibration or tensile stress is applied to the electric wire 40, the connection between the electric wire 40 and the circuit board 21 is unlikely to be damaged.

In addition, since the contact portion 161 is provided on the elastic piece 160 that can elastically deform in the vertical direction, even if the electric wire 40 is clamped between the contact portion 161 and the mounting surface 54, the electric wire 40 is unlikely to be damaged.

[Effects of the Second Embodiment]
According to the second embodiment, the following actions and effects are achieved.
In the second embodiment, the protector 150 is elastically deformable in a first direction and includes an elastic piece 160 having a contact portion 161 , and the elastic piece 160 holds each electric wire 40 between itself and the mounting surface 54 .

With this configuration, each electric wire 40 arranged outside the electric wire accommodating section 52 is clamped between the elastic piece 160 and the mounting surface 54, so that the friction between each electric wire 40 and the mounting surface 54 and the contact section 161 can be increased. Therefore, damage to the connection between each electric wire 40 and each circuit board 21 can be further suppressed.

<Other embodiments>
(1) In the above first and second embodiments, the protectors 50, 150 each include a protector body 50A, 150A and a cover 50B, 150B, respectively. However, this is not limited to this, and the protector may be configured from a single member.
(2) In the above first and second embodiments, the circuit board 21 is a flexible board. However, this is not limited to this, and the circuit board may be a rigid board.
(3) In the first and second embodiments, the partition wall 56 is provided. However, the present invention is not limited to this, and the partition wall may be omitted.

1: Vehicle 2: Power storage pack 3: PCU
Description of the Related Art 4: Wire harness 10: Energy storage module 11: Energy storage element 15: Small metal piece 20: Wiring module 21: Circuit board 22: Board body 22A: Wire land 23: Extension portion 30: Bus bar 30A: Connection bus bar 30B: Output bus bar 40: Electric wire 50, 150: Protector 50A, 150A: Protector body 50B, 150B: Cover 51: Bus bar accommodating portion 52: Electric wire accommodating portion 52A: Bottom wall 52B: Side wall 52C: Cutout portion 53, 153: Intermediate wiring portion 54: Placement surface 55: Recess 55A: Bottom surface 55B: First connection surface 55C: Second connection surface 56: Partition wall 56A: Opening 57: Top plate portion 58, 161: Contact portion 160: Elastic piece D1: Distance R1 between the bottom surface of the recess and the contact portion in the vertical direction: diameter of the electric wire

Claims (5)

A wiring module that is attached to a plurality of energy storage elements having electrode terminals,
A plurality of bus bars;
A plurality of circuit boards;
A plurality of wires;
a protector that holds the bus bars, the circuit boards, and the electric wires,
Each of the bus bars is connected to the electrode terminal,
Each of the circuit boards is electrically connected to each of the bus bars,
Each of the electric wires is connected to each of the circuit boards,
The protector is a wiring module having: an electric wire accommodating section in which the plurality of electric wires are accommodated; a mounting surface on which each of the circuit boards is placed and which is capable of contacting each of the electric wires arranged outside the electric wire accommodating section; and a contact portion which is capable of contacting each of the electric wires arranged outside the electric wire accommodating section from the side opposite the mounting surface in a first direction perpendicular to the mounting surface. The protector includes a protector body and a cover overlapping the protector body in the first direction,
The protector body includes the mounting surface,
The wiring module according to claim 1 , wherein the cover comprises the contact portion. The protector has a recess recessed from the mounting surface,
The wiring module according to claim 1 , wherein the contact portion overlaps with the recess when viewed from the first direction. The wiring module according to claim 3, wherein the distance in the first direction between the bottom surface of the recess and the contact portion is set to be larger than the diameter of each of the electric wires. the protector is elastically deformable in the first direction and includes an elastic piece having the contact portion,
3. The wiring module according to claim 1, wherein the elastic piece holds each of the electric wires between the elastic piece and the placement surface.

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