Wiring Module

Abstract

To suppress a protrusion of a detection wire at a bent portion.SOLUTION: A wiring module 20 of the present disclosure includes: a detection terminal 30; a detection wire 45; a first housing part 55; a second housing part 56; an L-shaped third housing part 57 having a corner 57B on an inner peripheral side of a bent portion 45C and connecting the first housing part 55 and the second housing part 56, the third housing part housing the bent portion 45c therein; a pair of outer holding pieces 58 provided, as a pair, corresponding to both ends of the bent portion 45C and protruding from an outer peripheral side of the bent portion 45C toward the inner peripheral side thereof to hold the bent portion 45C; and a pair of inner holding pieces 59 provided, as a pair, corresponding to both ends of the bent portion 45C and protruding from the inner peripheral side of the bent portion 45C toward the outer peripheral side thereof to hold the bent portion 45C. The pair of inner holding pieces 59 are formed at least to project from a third side wall 57A on an inner peripheral side of the pair of third side walls 57A constituting both ends of the third housing part 57 to a position of a tangent line T arranged along the corner 57B at an angle forming 45° with respect to the third side wall 57A.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] A battery wiring module described in JP 2013-161566 A (Patent Document 1) is known as a wiring module mounted on vehicles such as electric vehicles and hybrid vehicles. This battery wiring module includes a bus bar connecting the electrode terminals of a pair of adjacent cells, a detection terminal connected to the bus bar, a detection wire connected to the wire connection portion of the detection terminal, a busbar accommodating portion for accommodating the bus bar, and a wire accommodating groove for accommodating the detection wire. The wire accommodating groove includes a pair of groove walls and a bottom, and extends in the direction of arrangement of the busbar accommodating portions. A pair of wire pressing pieces 36A, 36B protrude from the groove wall of the wire accommodating groove and press the detection wire. Furthermore, a notch is formed in the groove wall on the busbar accommodating portion side of the pair of groove walls for introducing the detection wire into the wire accommodating groove from the busbar accommodating portion side.

[0003] This battery wiring module had the following problem: The detection wire, which runs from the busbar accommodating section through the notch and into the wire accommodating groove, hits one of the pair of groove walls opposite the busbar accommodating section and bends laterally (in the direction in which the wire accommodating groove extends), and is routed along the groove wall due to the reaction force caused by the bending. However, at such a bent section, there is a concern that the reaction force may cause the detection wire to protrude outside the wire accommodating groove.

[0004] In contrast, in the above-mentioned battery wiring module, one of the wire pressing pieces 36B protrudes from one of the pair of groove wall portions opposite the busbar accommodating portion, and the gap formed at the tip end thereof for inserting the detection wire is biased toward the busbar accommodating portion rather than the center line in the width direction of the wire accommodating groove. This effectively prevents the detection wire from protruding outside the wire accommodating groove at the bent portion.

[0005] In the battery wiring module described above, as shown in FIG. 3 of Patent Document 1, the busbar accommodating portion and the cutout portion are connected via a barrel holding portion, and the barrel holding portion holds the wire connection portion of the detection wire. The barrel holding portion extends perpendicular to the wire accommodating groove, and the wire accommodating groove and the busbar accommodating portion are connected by the barrel holding portion and the cutout. A pair of wire pressing pieces 34A, 34B are provided facing each other from the upper edge of the cutout to prevent the detection wire from protruding from the barrel holding portion. Of the pair of wire pressing pieces 34A, 34B, the one located on the bent side of the detection wire (the left side in FIG. 3, hereinafter referred to as the "left side") is referred to as the left wire pressing piece 34A, and the one located on the opposite side to the bent side (the right side in FIG. 3, hereinafter referred to as the "right side") is referred to as the right wire pressing piece 34B. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-161566 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-described battery wiring module, the left-side wire pressing piece 34A is positioned closest to the corner between the notch and the wire accommodating groove, but the wire pressing piece 36A in the wire accommodating groove is positioned farther from the corner than the left-side wire pressing piece 34A. A connector may be provided at one of the ends of the detection wire opposite the detection terminal. When this connector is mated with a mating connector, the detection wire is pulled strongly, causing the detection wire to bend along the corner and be arranged along the shortest path. While the left-side wire pressing piece 34A holds the detection wire down on the notch side of the bent portion of the detection wire, there is no wire pressing piece to hold the detection wire on the wire accommodating groove side of the bent portion, which means that there is a risk that the detection wire will protrude outside the wire accommodating groove at the bent portion.

[0008] The present disclosure was completed in light of the above circumstances, and aims to prevent protrusion of a detection wire at a bent portion. [Means for solving the problem]

[0009] The wiring module of the present disclosure is a wiring module attached to a cell group formed by arranging a plurality of cells each having a pair of electrodes, and includes: a detection terminal connected to the electrode or connected to the electrode via a connection member; a first wiring section connected to the detection terminal and extending in a direction perpendicular to the arranging direction of the cells; a second wiring section extending in the arranging direction of the cells; and a detection wire connecting the first wiring section and the second wiring section and having a bent section bent from the perpendicular direction to the arranging direction; a first housing section that houses the first wiring section; a second housing section that houses the second wiring section; and a corner section on the inner periphery of the bent section, and the first housing section and the second housing section a pair of outer pressing pieces provided in correspondence with both ends of the bent portion, protruding from the outer circumferential side of the bent portion toward the inner circumferential side to press down on the bent portion; and a pair of inner pressing pieces provided in correspondence with both ends of the bent portion, protruding from the inner circumferential side of the bent portion toward the outer circumferential side to press down on the bent portion, wherein the pair of inner pressing pieces are formed to protrude from the inner third side wall of a pair of third side walls constituting both ends of the third accommodating portion at least to the position of a tangent line arranged along the corner at an angle of 45° with respect to the third side wall. [Effects of the Invention]

[0010] According to the present disclosure, protrusion of the detection wire at the bent portion can be suppressed. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a front part of the electricity storage module according to the first embodiment. [Figure 2] FIG. 2 is a front view of the electricity storage module. [Figure 3]FIG. 3 is a perspective view of the front of the battery stack. [Figure 4] FIG. 4 is a perspective view showing the main parts of a laminated battery. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a front view showing a state in which the bent portion of the detection wire is housed in the third housing portion while the detection wire has an excess length. [Figure 7] FIG. 7 is a front view showing how the detection wire is housed in the first housing portion and the third housing portion. [Figure 8] FIG. 8 is a front view showing a state in which the bent portion is housed in the third housing portion in a state in which the detection wire is pulled. [Figure 9] FIG. 9 is a cross-sectional view taken along line BB in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along CC in FIG. [Figure 11] FIG. 11 is an enlarged view of the main part of FIG. 8, illustrating that a pair of inner pressing pieces are disposed at the locations closest to the corners. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. (1) A wiring module according to the present disclosure is a wiring module that is attached to a group of cells that includes a plurality of cells arranged in a row, each cell having a pair of electrodes, and includes: a detection terminal that is connected to the electrode or that is connected to the electrode via a connection member; a first wiring section that is connected to the detection terminal and that extends in a direction perpendicular to the arrangement direction of the cells; a second wiring section that extends in the arrangement direction of the cells; and a detection wire that connects the first wiring section and the second wiring section and has a bent section that is bent from the perpendicular direction to the arrangement direction; a first housing section that houses the first wiring section; a second housing section that houses the second wiring section; and a detection wire that has a corner on the inner periphery of the bent section and that is connected to the first housing section and the second housing section. a pair of outer pressing pieces provided in correspondence with both ends of the bent portion, protruding from the outer circumferential side of the bent portion toward the inner circumferential side to press down on the bent portion; and a pair of inner pressing pieces provided in correspondence with both ends of the bent portion, protruding from the inner circumferential side of the bent portion toward the outer circumferential side to press down on the bent portion, wherein the pair of inner pressing pieces are formed to protrude from the inner third side wall of a pair of third side walls constituting both ends of the third accommodating portion at least to the position of a tangent arranged along the corner at an angle of 45° with respect to the third side wall.

[0013] Here, 45° does not have to be strictly 45° and may have a tolerance of, for example, ±5°, in which case the tangent may be disposed along the corner within a range of 40° to 50°. Also, the third side wall does not have to protrude strictly to the position of the tangent, as long as it protrudes at least to the position of the tangent, and may protrude beyond the position of the tangent.

[0014] The detection wire passing from the first housing section through the third housing section toward the second housing section is bent from the vertical direction toward the parallel direction along the third side wall on the outer periphery by a reaction force at the bending section. However, there is a concern that the reaction force at the bending section may cause the detection wire to protrude outside the third housing section. Therefore, the above-mentioned wiring module is provided with a pair of outer pressing pieces corresponding to both ends of the bending section, which prevents the detection wire from protruding from the bending section.

[0015] Furthermore, for example, if a connector is provided at one of the ends of the detection wire opposite the detection terminal and the detection wire is pulled strongly when mating this connector with a mating connector, the bent portion of the detection wire will be bent along the corner of the third accommodating section and arranged along the shortest path. In contrast, the above wiring module has a pair of inner pressing pieces provided corresponding to both ends of the bent portion, and the pair of inner pressing pieces are formed to protrude from the inner third side wall of a pair of third side walls that constitute both ends of the third accommodating section to the position of the tangent arranged along the corner at an angle of 45° to the third side wall, thereby preventing the detection wire from protruding from the bent portion.

[0016] (2) The first accommodating section has a pair of first side walls respectively connected to the pair of third side walls, and a pair of first pressing pieces that press the first wiring section are arranged opposite each other on the pair of first side walls, and it is preferable that the third gap formed between the outer pressing piece and the inner pressing piece that are located on the first accommodating section side of the third accommodating section and facing each other, and the first gap formed between the pair of first pressing pieces have the same dimensions and are aligned on the same straight line extending in the vertical direction.

[0017] Here, the same dimensions do not necessarily have to be exactly the same dimensions; it means that when the first gap and the third gap are viewed vertically, more than 50% of the total dimensions overlap, and it is sufficient that the detection wire can be accommodated in the first and third accommodating sections when stretched out in a straight line.

[0018] Since the third gap and the first gap have the same dimensions and are aligned in the same straight line extending vertically, the detection wire can be housed and routed in the first and third storage sections while stretched out in a straight line vertically, improving the workability of routing the detection wire.

[0019] (3) It is preferable that the tip of the first pressing piece is mountain-shaped, the first gap is formed in the narrowest part between the tips of the pair of first pressing pieces, the tip of the outer pressing piece and the tip of the inner pressing piece are both mountain-shaped, and the third gap is formed in the narrowest part between the tip of the outer pressing piece located on the first storage section side in the third storage section and the tip of the inner pressing piece.

[0020] Since the tips of the outer pressing piece, the inner pressing piece, and the first pressing piece are formed in a mountain shape, the dimensions of the narrowest part, which is the most difficult to pass the detection wire through, are reduced, further improving the ease of wiring the detection wire.

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

[0022] <Embodiment> An embodiment will be described with reference to FIGS. 1 to 11. 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 up-down direction is an example of the vertical direction, and the left-right direction is an example of the arrangement direction.

[0023] [Battery stack] The energy storage module 10 includes a battery stack 11L shown in Fig. 3 and a wiring module 20 attached to the battery stack 11L. As shown in Fig. 1, the energy storage module 10 of this embodiment further includes a housing 15 that covers the battery stack 11L from all four sides, i.e., top, bottom, left, and right. The housing 15 includes a bottom 15A located on the underside of the battery stack 11L, a ceiling 15B located on the top side of the battery stack 11L, and a pair of side sections 15C that connect the bottom 15A and ceiling 15B on both the left and right sides.

[0024] [Laminated battery, electrode lead] As shown in Figure 3, the battery stack 11L is composed of multiple laminated batteries 11 (18 in this embodiment) stacked in the left-right direction. Note that Figure 3 only shows the front portion of the battery stack 11L. As shown in Figure 4, 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 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.

[0025] [Joint part] As shown in Figures 3 and 5, 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. As shown in Figure 3, 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.

[0026] The process of forming the joint 13 includes bending the electrode lead 12, laser welding, etc., and therefore the tolerance in the front-to-rear direction of the joint 13 (and the connection electrode lead 12A) is particularly likely to be large. For example, in this embodiment, the tolerance in the front-to-rear direction of the joint 13 (and the connection electrode lead 12A) is larger than the thickness of the electrode lead 12 (0.2 mm, 0.4 mm).

[0027] As shown in Figures 3 and 5, the battery stack 11L has an output unit 14 at the left end of its front section. Although not shown, the battery stack 11L also has an output unit 14 at the right end of its rear section. The output unit 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 unit 14 is designated as an output electrode lead 12B. The two output electrode leads 12B that form one output unit 14 have the same polarity. The output unit 14 forms the positive or negative electrode of the entire battery stack 11L. That is, for example, if the front output unit 14 is the overall positive electrode of the battery stack 11L, the rear output unit 14 is the overall negative electrode of the battery stack 11L.

[0028] [Wiring module] 1 , the wiring module 20 of this embodiment includes a detection terminal 30 connected to the connection electrode lead 12A, a bus bar 40 connected to the output electrode lead 12B, a detection wire 45 connected to the detection terminal 30, and a protector 50 that holds the detection terminal 30, the bus bar 40, and the detection wire 45. The configuration of the wiring module 20 disposed on the front side of the power storage module 10 will be described in detail below. Although not shown, the wiring module 20 disposed on the rear side of the power storage module 10 is configured similarly to the wiring module 20 disposed on the front side of the power storage module 10.

[0029] The busbar 40 has a plate-like shape and is formed by processing a conductive metal plate. As shown in FIG. 2, 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 center of the first portion 40A in the vertical direction. A busbar-side connection portion 41 is provided at the right end of the second portion 40B.

[0030] 1, the busbar side connection portion 41 has a through hole 41A 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).

[0031] [Detection wire] The detection wires 45 have a core wire and an insulating coating that covers the core wire. One end of the detection wires 45 is connected to the detection terminal 30 that detects the voltage of each laminated battery 11. As shown in Figures 1 and 2, the other end of the detection wires 45 is bundled together and connected to a connector 48. The detection wires 45 are routed in the routing recess 50A of the protector 50, and are routed in a predetermined position. The detection wires in the claims include wires connected to the detection terminal 30 as well as wires connected to devices that detect the current, temperature, etc. of each laminated battery 11 and other control units.

[0032] As shown in Figure 2, the connector 48 includes a housing 48A made of insulating synthetic resin and male terminals 48B housed inside the housing 48A. The connector 48 is designed to mate with a mating connector (not shown) that has female terminals. The mating connector is connected to an external ECU (Electronic Control Unit) or the like via wires (not shown). The ECU is equipped with a microcomputer, elements, etc., and has a well-known configuration that includes functions such as detecting the voltage, current, temperature, etc. of each laminated battery 11 and controlling the charging and discharging of each laminated battery 11.

[0033] [Detection terminal] The detection terminal 30 is formed by processing a conductive metal plate. As shown in Fig. 2, the detection 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 disposed on the right side of the detection terminal 30 and has a rectangular shape in a front view. The main body 31 is housed in a terminal accommodating portion 54 so that the plate thickness direction is the front-to-rear direction. A terminal holding portion 54A that holds the detection terminal 30 inside the terminal accommodating portion 54 is provided at the lower end of the terminal accommodating portion 54.

[0034] The connection portion 32 has a rectangular shape that is elongated in the left-right direction and is formed flush with the main body portion 31. The connection portion 32 protrudes upward and downward from the main body portion 31 in the vertical direction. As shown in FIG. 5 , the connection portion 32 is configured to be connected in surface contact with the joint portion 13 or a part of the connection electrode lead 12A that constitutes the joint portion 13. In other words, the detection terminal 30 is not a member for connecting adjacent connection electrode leads 12A, but a member for connecting a previously connected connection electrode lead 12A (joint portion 13) to the detection wire 45. Therefore, the vertical dimension of the connection portion 32 may be smaller than the vertical dimension of the connection electrode lead 12A.

[0035] [Protector] As shown in FIG. 1, the protector 50 is made of insulating synthetic resin and has a plate shape. The protector 50 includes a protector body 51 that is positioned relative to the housing 15 (and the battery stack 11L). As shown in FIG. 2, a plurality of 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 recesses 52 are 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.

[0036] 2, 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 detection terminal 30 is provided diagonally below and to the left of connection electrode accommodating recess 52A. Terminal accommodating portion 54 is recessed rearward from protector body 51.

[0037] [Routing recess] The wiring recess 50A is recessed rearward from the protector body 51, similar to the terminal accommodating portion 54. The interior of the wiring recess 50A is connected to the interior of the terminal accommodating portion 54, and the detection wire 45 drawn from the detection terminal 30 accommodated in the terminal accommodating portion 54 is accommodated and routed in the wiring recess 50A. The wiring recess 50A includes a first accommodating portion 55 that is continuous with the upper part of the terminal accommodating portion 54 and extends in the vertical direction, a second accommodating portion 56 that is arranged above the first accommodating portion 55 and extends in the horizontal direction, and a third accommodating portion 57 that connects the first accommodating portion 55 and the second accommodating portion 56.

[0038] The first accommodating portion 55 is formed adjacent to the right side of the connection electrode accommodating recess 52A. The second accommodating portion 56 is formed adjacent to the upper side of the connection electrode accommodating recess 52A. The third accommodating portion 57 is L-shaped and connects the upper end of the first accommodating portion 55 to the left end of the second accommodating portion 56, which is located to the right and above the first accommodating portion 55. The corner 57B is located at the upper left of the connection electrode accommodating recess 52A, and is located on the inner circumferential side of the bent portion 45C, which will be described next.

[0039] The detection wire 45 has a first wiring section 45A connected to the detection terminal 30 and extending vertically, perpendicular to the arrangement of the laminated batteries 11; a second wiring section 45B extending horizontally, the same as the arrangement of the laminated batteries 11; and a bent section 45C connecting the first wiring section 45A and the second wiring section 45B and bending the section 45C from vertically to horizontally. The detection wire 45 has an excess length required for routing into the routing recess 50A or for mating the connector 48 with a mating connector. As a result, as shown in Figure 6, a reaction force is generated at the bent section 45C, causing the detection wire 45 to expand outward and be housed in the third housing section 57.

[0040] The first accommodating section 55 accommodates the first wiring portion 45A of the detection wire 45, the second accommodating section 56 accommodates the second wiring portion 45B of the detection wire 45, and the third accommodating section 57 accommodates the bent portion 45C of the detection wire 45. In detail, the third accommodating section 57 is an L-shaped area surrounded by a dashed line in Fig. 6, and is the area that accommodates the bent portion 45C.

[0041] Both ends of the third storage section 57 are formed by a pair of third side walls 57A, with the pair of third side walls 57A located on the lower end side facing each other in the left-right direction, and the pair of third side walls 57A located on the right end side facing each other in the up-down direction. Furthermore, of the pair of third side walls 57A located on the lower end side, the one located on the right side is the outer peripheral third side wall 57A, and the one located on the left side is the inner peripheral third side wall 57A. Similarly, of the pair of third side walls 57A located on the right end side, the upper one is the outer peripheral third side wall 57A, and the lower one is the inner peripheral third side wall 57A.

[0042] A pair of outer pressing pieces 58 and a pair of inner pressing pieces 59 are formed at both ends of third accommodating section 57. The pair of outer pressing pieces 58 are provided corresponding to both ends of bent portion 45C, protruding from the outer periphery side toward the inner periphery side of bent portion 45C to press bent portion 45C from the front. The pair of inner pressing pieces 59 are provided corresponding to both ends of bent portion 45C, protruding from the inner periphery side toward the outer periphery side of bent portion 45C to press bent portion 45C from the front.

[0043] The role of the outer pressing piece 58 is to prevent the detection wire 45 from protruding outward when the detection wire 45 has excess length and is arranged on the outer periphery away from the corner 57B due to the reaction force of the detection wire 45. The role of the inner pressing piece 59 is to prevent the detection wire 45 from protruding outward when the detection wire 45 is pulled during the operation of mating the connector 48 with the mating connector, or when the detection wire 45 has no excess length and is arranged on the inner periphery close to the corner 57B.

[0044] More specifically, the pair of outer pressing pieces 58 is made up of an outer pressing piece 58 formed to protrude downward from the upper third side wall 57A on the right end side of the third accommodating section 57, and an outer pressing piece 58 formed to protrude rightward from the left third side wall 57A on the bottom end side of the third accommodating section 57. Meanwhile, the pair of inner pressing pieces 59 is made up of an inner pressing piece 59 formed to protrude upward from the lower third side wall 57A on the right end side of the third accommodating section 57, and an inner pressing piece 59 formed to protrude leftward from the right third side wall 57A on the bottom end side of the third accommodating section 57.

[0045] The pair of outer pressing pieces 58 are formed to have a smaller protruding dimension than the pair of inner pressing pieces 59. However, since the detection electric wire 45 is normally routed in the routing recess 50A with an excess length, both ends of the bent portion 45C are arranged behind the pair of outer pressing pieces 58 by a reaction force and are pressed from the front by the pair of outer pressing pieces 58.

[0046] The first housing portion 55 has a pair of first side walls 55A that are respectively connected below a pair of third side walls 57A that are located on the lower end side of the third housing portion 57. A pair of first pressing pieces 61 that press the first wiring portion 45A are provided on the pair of first side walls 55A and arranged facing each other. The left first pressing piece 61 is formed to protrude rightward from the left first side wall 55A, and the right first pressing piece 61 is formed to protrude leftward from the right first side wall 55A.

[0047] The gap formed between the outer pressing piece 58 and the inner pressing piece 59, which are located at the lower end of the third accommodating section 57 and face each other, is referred to as the third gap S3, and the gap formed between the pair of first pressing pieces 61 is referred to as the first gap S1. As shown in FIG. 7, the first gap S1 and the third gap S3 have substantially the same dimensions and are arranged side by side on the same straight line L extending in the vertical direction. By arranging the gaps S1 and S3 in this manner, when the detection electric wire 45 is housed and routed in the routing recess 50A, the detection electric wire 45 can be housed in a straight state, which makes the routing easier and improves workability.

[0048] The tips of the first pressing pieces 61 are angled, and a first gap S1 is formed in the narrowest portion between the tips of the pair of first pressing pieces 61. In addition, a third gap S3 is formed in the narrowest portion between the tips of the outer pressing pieces 58 and the inner pressing piece 59, which are located on the lower end side of the third accommodating section 57. When accommodating and routing the detection electric wire 45 in the routing recess 50A, it is most difficult to pass the detection electric wire 45 through the narrowest portion. However, with the above configuration, the vertical dimension of the narrowest portion is smallest, and therefore the workability of routing the detection electric wire 45 can be further improved.

[0049] [Inner clamp placement] Next, the arrangement of the inner pressing pieces 59 will be described with reference to FIGS. 8 to 11. The pair of inner pressing pieces 59 are arranged at the closest positions to the corner 57B of the third housing section 57. Holes 62 are formed behind the outer pressing piece 58 and the inner pressing piece 59 to allow the mold to be removed when molding them. If the pair of inner pressing pieces 59 are moved closer to the corner 57B while taking into account manufacturing tolerances, the thickness of the region between the pair of holes 62 decreases, thereby reducing the strength of the bottom wall of the third housing section 57. Therefore, the above-mentioned closest positions refer to the positions at which the pair of inner pressing pieces 59 can be moved closest to the corner 57B without causing a reduction in strength.

[0050] 8 , when the detection wire 45 is pulled strongly to the outside of the protector 50, for example, when the connector 48 is mated with the mating connector, the detection wire 45 will take the shortest path. If the pair of inner pressing pieces 59 were not disposed at the closest point, the detection wire 45 might protrude forward from the third accommodating section 57 at the corner 57B. In this regard, in the present embodiment, the pair of inner pressing pieces 59 are disposed at the closest point. Therefore, even if the detection wire 45 takes the shortest path, the detection wire 45 is disposed behind the pair of inner pressing pieces 59, and therefore the pair of inner pressing pieces 59 can reliably hold the detection wire 45 from the front.

[0051] 9, at the lower end of the third accommodating section 57, the bent portion 45C of the detection wire 45 is located behind the inner pressing piece 59, which prevents the bent portion 45C from protruding forward from the third accommodating section 57. Similarly, at the right end of the third accommodating section 57 shown in FIG. 10, the bent portion 45C of the detection wire 45 is located behind the inner pressing piece 59, which prevents the bent portion 45C from protruding forward from the third accommodating section 57. The distance between the tip of the outer pressing piece 58 and the tip of the inner pressing piece 59 at the narrowest portion is the same as or slightly smaller than the outer diameter of the detection wire 45, which prevents the detection wire 45 from easily protruding out of the wiring recess 50A at the narrowest portion.

[0052] The reason why the pair of inner pressing pieces 59 can reliably hold down the detection wire 45 when the detection wire 45 takes the shortest path will be explained with reference to FIG. 11 . First, a tangent line T is drawn along the corner 57B at an angle of 45° to the third side wall 57A. The tangent line T is tangent to the corner 57B and is angled 45° with the third side wall 57A located on the lower end side of the third housing portion 57. The tangent line T is also angled 45° with the third side wall 57A located on the right end side of the third housing portion 57. Each of the pair of inner pressing pieces 59 is formed to protrude from the third side wall 57A on the inner periphery side to the position of the tangent line T. As a result, of the pair of oblique sides 59A formed at the tip of each inner pressing piece 59, the oblique side 59A closer to the corner 57B is arranged along the tangent line T.

[0053] If the detection wire 45 takes the shortest path, the detection wire 45 will pass on the inner circumferential side of the tangent line T at the position of the inner pressing piece 59, and therefore, if the inner pressing piece 59 is formed to protrude up to the position of the tangent line T, the detection wire 45 will necessarily be located behind the inner pressing piece 59. Therefore, the detection wire 45 is held down from the front by the pair of inner pressing pieces 59 at both ends of the third accommodating section 57, and the detection wire 45 can be prevented from protruding forward at the corners 57B.

[0054] [Effects of the embodiment] According to the embodiment, the following actions and effects are achieved.

[0055] The wiring module 20 according to the embodiment is a wiring module 20 that is attached to a battery stack 11L that is made up of a plurality of laminated batteries 11, each having a pair of electrode leads 12, and includes a detection terminal 30 that is connected to the electrode leads 12, a detection wire 45 that has a first wiring section 45A that is connected to the detection terminal 30 and extends in the vertical direction, a second wiring section 45B that extends in the horizontal direction, and a bent section 45C that connects the first wiring section 45A and the second wiring section 45B and is bent from the vertical direction to the horizontal direction, a first housing section 55 that houses the first wiring section 45A, a second housing section 56 that houses the second wiring section 45B, and a corner section 57B on the inner periphery of the bent section 45C, and the first housing section 55 and the second housing section 56 6 and accommodates the bent portion 45C; a pair of outer pressing pieces 58 provided in correspondence with both ends of the bent portion 45C, protruding from the outer periphery side toward the inner periphery side of the bent portion 45C to press the bent portion 45C; and a pair of inner pressing pieces 59 provided in correspondence with both ends of the bent portion 45C, protruding from the inner periphery side toward the outer periphery side of the bent portion 45C to press the bent portion 45C. The pair of inner pressing pieces 59 are formed to protrude from the inner third side wall 57A of a pair of third side walls 57A constituting both ends of the third accommodating portion 57 to the position of a tangent T arranged along the corner portion 57B at an angle of 45° to the third side wall 57A.

[0056] The detection wire 45, which passes from the first accommodating section 55 through the third accommodating section 57 toward the second accommodating section 56, is bent from the vertical direction to the horizontal direction along the third side wall 57A on the outer periphery by a reaction force at the bending section 45C. However, there is a concern that the reaction force at the bending section 45C may cause the detection wire 45 to protrude outside the third accommodating section 57. Therefore, in the above-described wiring module 20, a pair of outer pressing pieces 58 is provided corresponding to both ends of the bending section 45C, which makes it possible to prevent the detection wire 45 from protruding from the bending section 45C.

[0057] Furthermore, for example, if connector 48 is provided at one of both ends of detection wire 45 opposite detection terminal 30 and detection wire 45 is pulled strongly when connector 48 is mated with a mating connector, bent portion 45C of detection wire 45 is bent along corner 57B of third accommodating portion 57 and arranged along the shortest path. In contrast, in the above-described wiring module 20, a pair of inner pressing pieces 59 is provided corresponding to both ends of bent portion 45C, and the pair of inner pressing pieces 59 are formed to protrude from the inner third side wall 57A of a pair of third side walls 57A constituting both ends of third accommodating portion 57 to the position of tangent T arranged along corner 57B at an angle of 45° with respect to third side wall 57A. This makes it possible to prevent detection wire 45 from protruding from bent portion 45C.

[0058] In the embodiment, the first accommodating section 55 has a pair of first side walls 55A each connected to a pair of third side walls 57A, and a pair of first pressing pieces 61 that press the first wiring section 45A are arranged opposite each other on the pair of first side walls 55A, and the third gap S3 formed between the outer pressing piece 58 and the inner pressing piece 59 that are located on the first accommodating section 55 side of the third accommodating section 57 and face each other, and the first gap S1 formed between the pair of first pressing pieces 61 have the same dimensions and are aligned on the same straight line L extending in the vertical direction.

[0059] Since the third gap S3 and the first gap S1 have the same dimensions and are aligned on the same straight line L extending in the vertical direction, the detection wire 45 can be housed and routed in the first storage section 55 and the third storage section 57 while being stretched in a straight line in the vertical direction, improving the workability of routing the detection wire 45.

[0060] In the embodiment, the tip of the first pressing piece 61 is mountain-shaped, and a first gap S1 is formed in the narrowest part between the tips of the pair of first pressing pieces 61, and the tip of the outer pressing piece 58 and the tip of the inner pressing piece 59 are both mountain-shaped, and a third gap S3 is formed in the narrowest part between the tip of the outer pressing piece 58 located on the first accommodating section 55 side in the third accommodating section 57 and the tip of the inner pressing piece 59.

[0061] Since the tip of the outer pressing piece 58, the tip of the inner pressing piece 59 and the tip of the first pressing piece 61 are formed in a mountain shape, the dimensions of the narrowest part where it is most difficult to pass the detection electric wire 45 are reduced, and the workability of wiring the detection electric wire 45 can be further improved.

[0062] <Other embodiments> (1) In the above embodiment, the detection terminal 30 is directly connected to the joint 13 (connection electrode lead 12A), but it may also be connected to the joint 13 (connection electrode lead 12A) via a connecting member such as a bus bar.

[0063] (2) In the above embodiment, the pair of first pressing pieces 61 is disposed in only one location, but the pair of first pressing pieces 61 may be disposed in multiple locations.

[0064] (3) In the above embodiment, the tip of the outer pressing piece 58, the tip of the inner pressing piece 59, and the tip of the first pressing piece 61 are all shown as having a mountain shape, but this is not limited to this, and they may be arc-shaped or have a flat shape extending in the vertical direction.

[0065] (4) In the above embodiment, the joint 13 is configured by joining four electrode leads 12 together, but this is not limited to this. The joint may be configured by joining a plurality of electrode leads together. [Explanation of symbols]

[0066] 10: Energy storage module 11: Laminated battery (single cell) 11L: Battery stack (cell group) 12: Electrode lead (electrode) 12A: Connection electrode lead 12B: Output electrode lead 13:Joint part 15: Cabinet 15A: Bottom 15B: Ceiling 15C: Lateral part 20: Wiring module 30: Detection terminal 31: Main body 32: Connection 34: Wire connection part 40: Busbar 40A: 1st part 40B:Second part 41: Busbar side connection 41A: Through hole 45:Detection wire 45A: 1st wiring section 45B: 2nd wiring section 45C: Bent section 48: Connector 48A: Housing 48B: Male terminal 50: Protector 50A: Routing recess 51: Protector body 52: Electrode receiving recess 52A: Connection electrode receiving recess 52B: Output electrode accommodating recess 53: Busbar holding part 53A: Bolt fastening part 54: Terminal housing 54A: Terminal holding part 55: First storage area 55A: First side wall 56: Second storage area 57: Third storage area 57A: Third side wall 57B: Corner 58: Outer retaining piece 59: Inner retainer piece 59A: Hypotenuse 60: Tangent 61: First clamp piece 62: Drill hole L: Straight line S1: 1st cavity S3: Third void T: tangent

Claims

1. A wiring module that is attached to a cell group formed by arranging a plurality of cells each having a pair of electrodes, a detection terminal connected to the electrode or connected to the electrode via a connection member; a detection wire including a first wiring portion connected to the detection terminal and extending in a direction perpendicular to the arrangement direction of the unit cells, a second wiring portion extending in the arrangement direction of the unit cells, and a bent portion connecting the first wiring portion and the second wiring portion and bent from the perpendicular direction toward the arrangement direction; a first housing portion that houses the first wiring portion; a second housing portion that houses the second wiring portion; an L-shaped third accommodating portion having a corner on an inner peripheral side of the bent portion, connecting the first accommodating portion and the second accommodating portion, and accommodating the bent portion; a pair of outer pressing pieces provided corresponding to both ends of the bent portion, the outer pressing pieces protruding from the outer circumferential side of the bent portion toward the inner circumferential side thereof to press the bent portion; a pair of inner pressing pieces provided corresponding to both ends of the bent portion, protruding from the inner peripheral side of the bent portion toward the outer peripheral side thereof to press the bent portion; a wiring module, wherein the pair of inner pressing pieces are formed to protrude at least from the inner third side wall of a pair of third side walls that constitute both ends of the third accommodating section to the position of a tangent arranged along the corner portion at an angle of 45° to the third side wall.

2. the first storage portion has a pair of first side walls respectively connected to the pair of third side walls, a pair of first pressing pieces that press the first wiring portion are provided on the pair of first side walls and are arranged opposite to each other; 2. The wiring module according to claim 1, wherein a third gap formed between the outer pressing piece and the inner pressing piece that are located on the first accommodating section side of the third accommodating section and face each other, and a first gap formed between the pair of first pressing pieces, have the same dimensions and are aligned on the same straight line extending in the vertical direction.

3. The tips of the first pressing pieces are formed in a mountain shape, and the first gap is formed at the narrowest portion between the tips of the pair of first pressing pieces, 3. The wiring module according to claim 2, wherein the tip of the outer pressing piece and the tip of the inner pressing piece are both mountain-shaped, and the third gap is formed in the narrowest part between the tip of the outer pressing piece located on the first accommodating section side in the third accommodating section and the tip of the inner pressing piece.

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