JP2017091675A - Wiring module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring module capable of coping with positional displacement of electrode terminals in a mounting direction to a storage element group. SOLUTION: A wiring module 1 attached to a unit cell group 2 in which a plurality of unit cells 3 are arranged in a first direction from a direction orthogonal to the first direction is connected to an electrode terminal 4 of the unit cell 3. The bus bar 50 and the holding unit 10 that holds the bus bar 50 are provided. The holding unit 10 is provided with an enclosing wall 20 that surrounds the peripheral edge of the bus bar 50 and opens in the mounting direction of the wiring module 1. The inner wall of the enclosing wall 20 is disposed on the side of the bus bar 50 in the mounting direction and is arranged on the bus bar 50 side. The retaining piece 27 is formed so that it can be prevented from coming off and can be flexibly deformed in the mounting direction. [Selection diagram] Fig. 16

Description

  The technology disclosed in this specification relates to a wiring module.

  2. Description of the Related Art As a power storage module dedicated for electric vehicles and hybrid vehicles, a structure in which a large number of power storage elements are arranged side by side in order to increase output is known. In such a power storage module, a wiring module holding a connection member such as a bus bar is attached to the power storage element group from a direction orthogonal to the direction in which the power storage elements are arranged, and the electrode terminals of adjacent power storage elements are connected by the connection member. Thus, a plurality of power storage elements are connected.

  By the way, when arranging a plurality of power storage elements in a power storage module, there may be a positional shift in the arrangement of electrode terminals formed on the power storage elements due to manufacturing tolerances or assembly tolerances of the power storage elements.

  Therefore, for example, in Patent Document 1 below, in the battery module configured by connecting the bus bar insulating members holding the bus bars in the arrangement direction of the single cells, when connecting adjacent bus bar insulating members via the bus bars, The thing which connected both with respect to the bus-bar movably is disclosed. In such a battery module, the relative displacement of the bus bar and the bus bar insulating member can cope with the positional deviation of the electrode terminals in the cell arrangement direction.

JP 2012-199007 A

In Patent Document 1, a clearance is provided between the bus bar and a locking claw that locks the bus bar in the mounting direction to the unit cell group, so that it is possible to cope with the positional deviation of the electrode terminal in the same direction. A configuration is also disclosed.
However, if the clearance between the locking claw for locking the bus bar and the bus bar is set to be large, the bus bar held in the battery module may become shaky. For this reason, the positional deviation that can be dealt with by the above configuration is limited, and the positional deviation in a wide range of the electrode terminal in the mounting direction cannot be sufficiently dealt with.

  The technology disclosed in the present specification has been completed based on the above circumstances, and provides a wiring module capable of dealing with a wide range of displacement of electrode terminals in the direction of attachment to a storage element group. Objective.

  The wiring module disclosed in this specification is a wiring module that is attached to a power storage element group in which a plurality of power storage elements having positive and negative electrode terminals are arranged in a first direction from a direction orthogonal to the first direction. A connecting member connected between the electrodes; and a holding unit for holding the connecting member. The holding unit surrounds the periphery of the connecting member and opens in the mounting direction of the wiring module. An encircling wall is provided, and an inner wall of the encircling wall is provided on the attachment direction side of the connection member to prevent the connection member from coming off, and a retaining portion that can be bent and deformed in the attachment direction is formed. ing.

  According to the above configuration, the retaining portion for retaining the connection member is bent and deformed in the mounting direction of the wiring module, thereby obtaining a wiring module that can cope with the positional displacement of the electrode terminal in a wide range in the mounting direction. Can do.

  Further, in the wiring module disclosed in the present specification, the retaining portion is formed in a cantilever shape protruding from the inner wall to the attachment direction side of the connection member and is opposed to the connection member. In the engaging surface, the protruding end side may be inclined in a direction approaching the connecting member.

  According to the above configuration, when the connecting member is held at the normal position in the surrounding wall of the holding unit, the connecting member has an excessive clearance due to the protruding end of the retaining portion inclined in the direction approaching the connecting member. It is locked without being rattled. When the connecting member is pushed up in the mounting direction in the surrounding wall due to the displacement of the electrode terminal, the retaining member is bent and deformed so that the protruding end is displaced in the same direction, so that the holding position of the connecting member This displacement is absorbed, and the connecting member is locked below the retaining portion at a position displaced from the normal position toward the attachment direction. Thus, with a simple configuration, a retaining portion that can be bent and deformed in the mounting direction of the wiring module is formed, and a wiring module that can cope with positional displacement of the electrode terminals in a wide range in the mounting direction can be obtained.

  Further, in the wiring module disclosed in the present specification, a plurality of the holding units are arranged in the first direction, and the connection member held by one holding unit and the holding unit adjacent to the one holding unit are arranged. Among them, the engaging portion provided on one side and the engaged portion provided on the other side are connected so as to be movable in the first direction by engaging with clearance. The engagement portion is configured to abut against the engagement portion, thereby restricting and temporarily fixing a free relative movement of the connection member and the adjacent holding unit in the first direction, and the connection. When a force is applied from the outside to at least one of the member and the adjacent holding unit, a contact portion that allows relative movement in the first direction may be provided.

  In the configuration disclosed in Patent Document 1, before the plurality of connected bus bar insulating members are fixed to the cell group, the adjacent bus bar insulating members are connected so that they can always freely move relative to the bus bar. For this reason, the connection interval of the bus bar insulating members cannot be kept constant, which makes it difficult to attach the unit to the unit cell group. According to the above configuration, when the abutting portion provided in the engaged portion abuts on the engaging portion, the connection member held by one holding unit and the adjacent holding unit can freely move relative to each other. Is temporarily fixed in a regulated state. Thereby, the connection interval of the holding units in the wiring module can be maintained at a predetermined interval, and the mounting operation of the wiring module and the like becomes much easier. For displacement of the electrode terminal in the first direction, if necessary, external force is applied to at least one of the connection member and the holding unit to move the connection member and the holding unit relative to each other, thereby adjusting the coupling interval of the holding units. This can be done. As a result, it is possible to obtain a wiring module that can cope with the positional deviation of the electrode terminals in the first direction while significantly improving the handling of the wiring module.

  Further, in the wiring module disclosed in the present specification, the engaging portion is formed to protrude from an inner wall of the surrounding wall of the holding unit, and the engaged portion is formed in a concave shape at an edge portion of the connection member. At least one of the contact surfaces that contact each other in the contact portion and the engagement portion may be a curved surface. Alternatively, at least one of the contact surfaces that contact each other in the contact portion and the engagement portion may be a tapered surface.

  According to the above configuration, the external force required to move the connecting member and the holding unit relative to each other can be kept small, and adjustment of the coupling interval of the holding units is facilitated.

  ADVANTAGE OF THE INVENTION According to this invention, the wiring module which can respond to the position shift in the wide range of the electrode terminal in the attachment direction to an electrical storage element group can be provided.

The top view of the battery module attached to the cell group in the state where the wiring module which concerns on one Embodiment was connected with the predetermined | prescribed space | interval. The perspective view of the holding | maintenance unit which hold | maintained the connection member and was connected with predetermined spacing The perspective view of the holding | maintenance unit which hold | maintained the connection member and was connected with predetermined spacing Top view of the intermediate holding unit holding the connection member Perspective view of intermediate holding unit holding connection member Perspective view of intermediate holding unit holding connection member Perspective view of intermediate holding unit holding connection member Perspective view of intermediate holding unit holding connection member Side view of the intermediate holding unit holding the connection member Top view of the end holding unit holding the connection member The perspective view of the edge part holding | maintenance unit holding the connection member The perspective view of the edge part holding | maintenance unit holding the connection member Top view of connecting member Sectional view in AA of FIG. 10 of the edge part holding | maintenance unit with which the connection member was hold | maintained in the normal position. Sectional view in AA of FIG. 10 of the edge part holding | maintenance unit hold | maintained in the state in which the connection member was pushed up a little Sectional view in AA of FIG. 10 of the edge part holding | maintenance unit hold | maintained in the state in which the connection member was pushed up to the highest position The top view of the battery module attached to the cell group in the state where the wiring module which concerns on one Embodiment was connected by the connection space | interval narrower than a predetermined | prescribed space | interval. The top view of the battery module attached to the cell group in the state where the wiring module which concerns on one Embodiment was connected by the connection space | interval narrower than a predetermined | prescribed space | interval. The top view of the battery module with which the wiring module which concerns on other embodiment was attached

<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the wiring module 1 according to the present embodiment is attached to a unit cell group 2 in which a plurality of unit cells 3 (an example of a storage element) having positive and negative electrode terminals 4 are arranged. FIG. 1 shows a part of the unit cell group 2 (for six unit cells 3). Hereinafter, when the positive electrode terminal is 4A and the negative electrode terminal is 4B, and they are not distinguished or collectively referred to, they are referred to as electrode terminals 4.

(Battery module M1)
A battery module M1 (an example of a power storage module) in which the wiring module 1 of this embodiment is attached to the unit cell group 2 is used as a drive source of a vehicle (not shown) such as an electric vehicle or a hybrid vehicle. . The plurality of single cells 3 constituting the single cell group 2 are connected in series by electrically connecting the positive terminal 4 </ b> A and the negative terminal 4 </ b> B of the different single cells 3 by the wiring module 1.

  Hereinafter, the left side in FIG. 1 is the left (the right side is the right), the front side of the paper is the top (the back side of the paper is the bottom), and the lower side is the front (the top is the back). In the present embodiment, the left-right direction in which the cells 3 are arranged is the first direction, and the up-down direction is the mounting direction.

(Single cell 3)
The unit cell 3 has a rectangular parallelepiped shape that is flat in the left-right direction, and a positive electrode terminal 4A and a negative electrode terminal 4B are formed on the upper surface thereof. The electrode terminal 4 includes a pedestal (not shown) made of a metal plate material and an electrode post that protrudes upward from the pedestal in a round bar shape. An insertion hole 51 of a bus bar 50 (an example of a connecting member) to be described later is inserted into the electrode terminal 4, and the electrode terminal 4 and the bus bar 50 are fixed by a fixing member (not shown).

(Single cell group 2)
As shown in FIG. 1, the cells 3 are arranged in the left-right direction so that the polarities of the adjacent electrode terminals 4 are different (so that the positive terminals 4A and the negative terminals 4B are alternately arranged), and are not shown in the drawing. The unit cell group 2 is configured by being fixed by the tool.

(Wiring module 1)
As shown in FIG. 1, the wiring module 1 is attached to the row | line | column of the electrode terminal 4 arranged in the left-right direction in the upper surface (electrode terminal surface) of the cell group 2 in which the cell 3 was arranged in the left-right direction.
As shown in FIG. 2, the wiring module 1 includes a plurality of bus bars 50 connected to the electrode terminals 4 of the single cells 3 and a plurality of holding units 10 made of insulating resin that hold the bus bars 50. FIG. 2 shows a part of the wiring module 1 (for three holding units 10).

(Holding unit 10)
The holding unit 10 is made of an insulating resin material. As shown in FIGS. 2 and 3, the holding units 10 are connected to each other in the left-right direction via a bus bar 50. The holding unit 10 in the present embodiment is different in form between an end holding unit 10E arranged at the end and an intermediate holding unit 10C other than the end holding unit 10E. 2 and 3 show one end holding unit 10E on the left end and two intermediate holding units 10C connected on the right side. Hereinafter, the intermediate holding unit 10C and the end holding unit 10E will be described in this order. Hereinafter, the end holding unit 10E and the intermediate holding unit 10C are referred to as the holding unit 10 when they are not distinguished or collectively referred to.

(Intermediate holding unit 10C)
4 to 9 show the intermediate holding unit 10C viewed from various angles. As shown in FIG. 4 and the like, the intermediate holding unit 10C includes a holding portion 12 that includes the surrounding wall 20 and holds the bus bar 50, a lead-out groove 13 that leads the electric wire W connected to the bus bar 50, An electric wire receiving groove 14 for receiving the electric wire W led out from the leading groove 13 is provided. These structures are all formed integrally with the intermediate holding unit 10C.

(Holding part 12 of intermediate holding unit 10C)
As shown in FIG. 4 and the like, the holding unit 12 is provided at a rear portion of the intermediate holding unit 10C. The holding part 12 includes a surrounding wall 20 including a front wall 21, a left wall 22, and a rear wall 23 that surrounds the front edge, the left edge, and the rear edge of the periphery of the bus bar 50. The height dimension of the front wall 21, the left wall 22, and the rear wall 23 constituting the surrounding wall 20 is higher than the upper end portion of the electrode terminal 4 when the wiring module 1 is attached to the unit cell group 2. Is set. Thereby, it can suppress that a tool etc. contact the electrode terminal 4 and the positive electrode terminal 4A and the negative electrode terminal 4B short-circuit.

  As shown in FIG. 5 and the like, the holding portion 12 is opened upward, which is the mounting direction of the wiring module 1, and the bus bar 50 is inserted from above. Further, below the bus bar 50, a mounting portion 24 that holds the lower surface of the bus bar 50 is formed so as not to hinder the electrical connection between the bus bar 50 and the electrode terminal 4.

  As shown in FIG. 5 and the like, the holding portion 12 is also opened to the right side, and a step portion 23 </ b> R formed thinner than the other portions is formed at the right end of the rear wall 23. Yes. On the other hand, the front wall 21 and the rear wall 23 extend leftward from the left wall 22, and the left upper end rear surface side of the rear wall 23 forms a U-shape with a cross-section opening downward in the left-right direction. A fitting portion 23L is formed to be opened. 2 and 3, the stepped portion 23R of one holding unit 10 is received in the fitting portion 23L of the intermediate holding unit 10C adjacent to the right side, so that the adjacent holding units 10 are They are arranged side by side in the left-right direction. Since the left wall 22 of the intermediate holding unit 10C adjacent to the right side is arranged on the right side of the holding unit 12 of the one holding unit 10, the four sides of the bus bar 50 held in the holding unit 12 are surrounded by insulating walls. The insulation state is maintained.

  As shown in FIG. 5 and the like, the left end portion of the front wall 21 and the inner wall of the fitting portion 23L of the rear wall 23 have convex portions (engagement portions) 26 that protrude toward the inside of the holding portion 12. Is formed. The convex portion 26 is formed at a position facing a concave portion (engaged portion) 55 formed as described later on the bus bar 50 held in the holding portion 12 adjacent to the left side of the holding unit 10. In a state where the bus bar 50 is held in the adjacent holding part 12, the convex part 26 is engaged with the concave part 55 with a clearance. The convex portion 26 will be described later in relation to the connection mechanism of the holding unit 10.

  As shown in FIG. 5, FIG. 6, and the like, the inner walls of the front wall 21 and the rear wall 23 of the holding portion 12 have a plurality of retaining pieces (retaining portions) that protrude toward the inside of the holding portion 12. 27) is formed. The retaining piece 27 can be elastically deformed in the thickness direction of each wall by being cantilevered between two slits 28 formed to extend upward from the lower end of the front wall 21 or the rear wall 23. Is formed. The retaining piece 27 is arranged on the upper side of the bus bar 50 held in the holding portion 12 and restricts the upward movement to prevent the retaining piece 27 from coming off. The retaining piece 27 will be described later in relation to the holding mechanism of the bus bar 50.

(Leading groove 13 of intermediate holding unit 10C)
As illustrated in FIG. 4 and the like, the lead-out groove 13 is provided in a concave shape extending forward from an intermittent portion formed in the front wall 21 on the front side of the holding portion 12. Hereinafter, the left side of the intermittent portion of the front wall 21 may be referred to as the left front wall 21L, and the right side may be referred to as the right front wall 21R. The lead-out groove 13 communicates the above-described holding portion 12 with a wire receiving groove 14 described later. Claw pieces 13 </ b> C protrude from the inner wall of the lead-out groove 13 so as to face each other. The electric wire W crimped to the bus bar 50 held by the holding portion 12 is inserted into the lead-out groove 13 while being prevented from being pulled out by the claw piece 13C, and is led out to the electric wire receiving groove 14.

(Wire receiving groove 14 of intermediate holding unit 10C)
As shown in FIG. 4 and the like, the electric wire receiving groove 14 is provided in a concave shape extending in the left-right direction along the front edge of the intermediate holding unit 10 </ b> C on the further front side than the lead-out groove 13. The wire receiving groove 14 is connected by connecting the holding unit 10, and forms one groove that communicates in the left-right direction along the front edge of the wiring module 1. The plurality of electric wires W crimped to the plurality of bus bars 50 and led out from the lead-out grooves 13 are bent at substantially right angles, are accommodated along the extending direction of the electric wire accommodation grooves 14, and are collectively led out from the wiring module 1. .

(End holding unit 10E)
As shown in FIGS. 10 to 12, the end holding unit 10 </ b> E has a shape in which a portion on the left side of the left wall 22 is cut away in the intermediate holding unit 10 </ b> C. The left end of the end holding unit 10E extends from the rear wall 23 of the holding unit 12 to the left side of the wire receiving groove 14, and is closed by a left end wall 22E. The intermediate holding unit 10C is provided on the left side of the left wall 22. However, the fitted structure, for example, the fitting portion 23L and the convex portion 26 are not provided. Since the holding portion 12, the lead-out groove 13, and the wire receiving groove 14 are the same as those provided on the left side of the left wall 22 in the intermediate holding unit 10C, the same structure is denoted by the same reference numeral, and the description will be made. Omitted.

(Bus bar 50)
As shown in FIG. 13, the bus bar 50 is formed by pressing a substantially rectangular plate material made of a metal such as copper, a copper alloy, stainless steel, or aluminum. The surface of the bus bar 50 may be plated with metal such as tin or nickel.

  A pair of insertion holes 51 are formed in the bus bar 50 at a predetermined interval on the left and right. The insertion hole 51 in the present embodiment has a circular shape in a top view, and is set so that the inner diameter dimension is slightly larger than the outer dimension of the electrode terminal 4. The interval between the insertion holes 51 is set according to the pitch between the adjacent positive electrode terminal 4A and negative electrode terminal 4B. In the insertion hole 51, the positive terminal 4A and the negative terminal 4B of the unit cell 3 are inserted and fixed by a fixing member (not shown).

  As shown in FIG. 13, a pair of opposed concave portions (engaged portions) 55 are cut out in a substantially rectangular shape at a portion near the right end of the front and rear edges of the bus bar 50. In the concave portion 55, the convex portion 26 of the holding unit 10 is engaged with a clearance. The recess 55 will be described later in relation to the connection mechanism of the holding unit 10.

(Bus bar 50 holding mechanism)
Next, a holding mechanism for the bus bar 50 in the holding unit 12 will be described with reference to FIG. 9 and FIGS. 14 to 16.
The bus bar 50 is held in a state in which movement is restricted in the left-right direction and the front-rear direction by connecting the holding unit 10 and arranging insulating walls on the four sides of the periphery. Hereinafter, a mechanism for holding the bus bar 50 while allowing displacement of the holding position in the holding portion 12 while restricting upward movement will be described.

  As shown in FIG. 9 and the like, the bus bar 50 is disposed between the placement portion 24 of the holding portion 12 and the retaining pieces 27 formed on the inner walls of the front wall 21 and the rear wall 23. Thus, the movement in the vertical direction is held in a restricted state.

  When the bus bar 50 is inserted into the holding portion 12 from above, the retaining piece 27 is elastically deformed toward the outside of the holding portion 12 at each wall when the bus bar 50 comes into contact therewith. When the bus bar 50 is further pushed in and arranged below the lower surface of the retaining piece 27, the retaining piece 27 is elastically restored, and the retaining piece 27 is disposed above the bus bar 50. In this manner, the bus bar 50 is locked with the lower surface of the retaining piece 27 as the locking surface 27A, and the upward movement is restricted.

  Here, as shown in FIG. 9 and the like, the locking surface 27A on the bottom surface of the retaining piece 27 is formed so as to have a downward slope toward the inside of the holding portion 12, that is, toward the protruding end. Accordingly, the retaining piece 27 can be bent and deformed so that the protruding end is displaced upward. As a result, even when the holding position of the bus bar 50 in the holding portion 12 is displaced based on the positional deviation of the electrode terminal 4 in a wide range in the vertical direction, the bus bar 50 can be held while allowing this. This will be specifically described below.

  9 and 14 show a state in which the bus bar 50 is held at the normal position. The lower surface of the bus bar 50 is brought into contact with the mounting portion 24, and is held with a slight clearance between the bus bar 50 and the locking surface 27 </ b> A of the retaining piece 27.

  FIG. 15 shows a state in which the electrode terminal 4 is displaced upward due to the manufacturing tolerance or assembly tolerance of the unit cell 3 and the bus bar 50 is pushed up from the placement portion 24 in the holding portion 12. The displacement of the holding position of the bus bar 50 is absorbed when the clearance formed between the bus bar 50 and the locking surface 27A in FIG. 14 is eliminated, and the bus bar 50 is locked at the protruding end of the retaining piece 27. It is abutted against 27A and held.

  FIG. 16 shows a state where the bus bar 50 is further pushed up in the holding portion 12. When the bus bar 50 presses the locking surface 27A from below, the retaining piece 27 as a whole is bent and deformed so that the protruding end is displaced upward. The displacement of the holding position of the bus bar 50 is absorbed when the retaining piece 27 is bent and deformed, and the bus bar 50 is held at a holding position higher than that in FIG.

(Connection mechanism of holding unit 10)
Next, the connection mechanism of the holding unit 10 will be described with reference to FIGS. 1, 17, and 18.
The holding unit 10 includes a recess 55 formed in the front edge and the rear edge of the bus bar 50 held in the holding part 12, and the left front wall 21 </ b> L and the rear wall 23 of the holding unit 10 adjacent to the right side. The protrusions 26 formed at the left end are engaged and fixed via the bus bar 50. In the present embodiment, the engagement structure between the convex portion 26 and the concave portion 55 is provided on both sides of the front edge and the rear edge of the bus bar 50. However, since the structure is basically the same, the holding portion 12 will be described below. An example of the engagement between the convex portion 26 formed on the rear wall 23 and the concave portion 55 formed on the rear edge of the bus bar 50 will be described.

  As shown in FIG. 1 and the like, the convex portion 26 and the concave portion 55 are formed between the left and right side surfaces of the convex portion 26 and the left and right side edges of the concave portion 55 in a state where the bus bar 50 is held in the holding portion 12. Are formed to be engaged with a predetermined clearance. By this clearance, the bus bar 50 held by one holding unit 10 and the holding unit 10 adjacent to the right side can be relatively moved in the left-right direction.

  As shown in FIG. 13 and the like, contact portions 56 are formed at both left and right corners in the recess 55 of the bus bar 50, and the interval between the contact portions 56 is a convex formed on the holding portion 12. It is set to be substantially the same as the protruding width of the portion 26. Thereby, the bus bar 50 and the holding unit 10 can be temporarily fixed in a state where the contact portion 56 contacts the convex portion 26 from both the left and right sides and the free movement of the convex portion 26 in the left-right direction is restricted. .

  In addition, the rear edge of the contact portion 56 is set so that the front and rear positions substantially overlap the front end that is the protruding end of the convex portion 26 in a state where the bus bar 50 is held in the holding portion 12. Thereby, by applying force from the outside, the bus bar 50 and the holding unit 10 can be moved relative to each other, and one of the adjacent intermediate holding units 10C can be moved relative to the other.

Here, the ridge portion of the contact portion 56 that becomes the contact surface 56A is chamfered so as to form a curved surface. Thereby, the external force required to move the bus bar 50 and the holding unit 10 relative to each other can be reduced. As a result, the connection interval of the holding units 10 maintained at a predetermined interval can be adjusted as necessary.
Note that the step portion 23 </ b> R and the fitting portion 23 </ b> L of the rear wall 23 are slid relative to each other in accordance with the connection interval of the holding unit 10. This will be specifically described below.

  FIG. 1 shows the battery module M1 attached to the unit cell group 2 in a state where the wiring module 1 is connected to the holding unit 10 at a predetermined connection interval. In this state, the bus bar 50 and the holding unit 10 are temporarily fixed in a state where the contact surfaces 56A are in contact with both the left and right side surfaces of the convex portion 26 and free relative movement in the left and right direction is restricted.

  FIG. 17 shows a battery module M1 in which the holding units 10 are connected at a connection interval narrower than the predetermined interval. By applying a force from the outside and pushing one of the adjacent holding units 10 connected at a predetermined interval into the other, the projecting end of the convex portion 26 is moved backward from the contact surface 56A of the left contact portion 56. The bus bar 50 and the holding unit 10 can be moved relative to each other along the edge, and the connection interval of the holding units 10 can be narrowed.

  FIG. 18 shows a battery module M1 in which the holding units 10 are connected at intervals wider than a predetermined interval. By applying force from the outside and pulling one of the adjacent holding units 10 connected at a predetermined interval away from the other, the protruding end of the convex portion 26 is moved from the contact surface 56A of the right contact portion 56 to the rear edge. The bus bar 50 and the holding unit 10 can be moved relative to each other so that the connection interval of the holding units 10 can be increased.

(Assembly method of battery module M1)
Next, an example of a method for assembling the battery module M1 according to the present embodiment will be described. The method for assembling the battery module M1 is not limited to the description of the present embodiment.

  First, a plurality of holding units 10 including the intermediate holding unit 10C and the end holding unit 10E are formed by injection molding of a synthetic resin using a mold. Next, the end holding unit 10E is arranged at the left end, and the plurality of holding units 10 are mounted while fitting the fitting portion 23L at the left end of the rear wall 23 of the intermediate holding unit 10C into the step portion 23R at the right end of the rear wall 23. Line up.

  Subsequently, the bus bar 50 is inserted into the holding unit 12 of the holding unit 10 from above while the contact portions 56 in the concave portion 55 of the bus bar 50 are in contact with the left and right side surfaces of the convex portion 26 of the holding portion 12. As described above, the bus bar 50 is sandwiched between the mounting portion 24 and the locking surface on the lower surface of the retaining piece 27 while elastically deforming the retaining piece 27, and the movement in the vertical direction is restricted. Is held in the holding unit 12. At this time, since the contact surfaces 56A are in contact with the left and right side surfaces of the convex portion 26, the bus bar 50 and the holding unit 10 are temporarily fixed in a state where free relative movement in the left and right direction is restricted.

  Subsequently, the electric wire W is caulked to the barrel portion 52 of the bus bar 50, led out from the lead-out groove 13 while being prevented from coming off by the claw piece 13 </ b> C, and arranged along the electric wire housing groove 14. Thereby, the wiring module 1 is temporarily assembled.

  Subsequently, the wiring module 1 temporarily assembled as described above is lifted and placed on the upper surface of the unit cell group 2 in which the plurality of unit cells 3 are arranged. Next, external force is applied so that the insertion interval 51 of the bus bar 50 is disposed corresponding to the positive electrode terminal 4A and the negative electrode terminal 4B of the unit cell 3, and the connection interval of the holding units 10 is adjusted as appropriate. In the left-right direction, the manufacturing tolerance and assembly tolerance of the interval between the adjacent positive electrode terminal 4A and negative electrode terminal 4B may be integrated, and the positional deviation of the electrode terminal 4 may be increased. This can be done by adjusting the connection interval.

  The wiring module 1 adjusted as described above is arranged so that the bus bar 50 comes into contact with the base while the insertion hole 51 of the bus bar 50 is inserted into the electrode post of the electrode terminal 4, and is fixed by a fixing member (not shown). At this time, even when the electrode terminal 4 is displaced in a wide range in the vertical direction, which is the mounting direction of the wiring module 1, and the holding position of the bus bar 50 is displaced, the retaining piece 27 is bent upward as described above. This can be done by transforming. When the electrode terminal 4 and the bus bar 50 are fixed, the cell group 2 can be electrically connected, and the battery module M1 is completed.

(Operation and effect of this embodiment)
Hereinafter, the operation and effect of the present embodiment will be described.
In the wiring module 1 according to the present embodiment, the inner wall of the surrounding wall 20 that defines the holding portion 12 provided in the holding unit 10 is arranged on the upper side of the bus bar 50 to prevent the bus bar 50 from coming off and upward. A retaining piece 27 that can be bent and deformed is formed.

  Accordingly, the retaining piece 27 is bent upward and deformed so that the displacement of the holding position of the bus bar 50 in the holding portion 12 can be absorbed, and the displacement of the electrode terminal 4 in a wide range in the vertical direction can be dealt with. It has become.

  In the wiring module 1 according to the present embodiment, the retaining piece 27 is formed in a cantilever shape protruding from the inner wall of the surrounding wall 20 to the upper side of the bus bar 50, and is a locking surface that locks against the bus bar 50. In 27A, the protruding end side is formed so as to be inclined in a direction approaching the bus bar 50. Thereby, the retaining piece 27 that can be bent and deformed upward can be formed with a simple configuration.

  Further, in the wiring module 1 according to the present embodiment, the convex portion 26 provided in the holding unit 10 is engaged with the concave portion 55 provided in the bus bar 50 held in the adjacent holding unit 10 with a clearance. Is done. Thereby, the holding unit 10 is connected so that relative movement is possible in the left-right direction. Here, by providing contact portions 56 that contact the left and right side surfaces of the convex portion 26 in the concave portion 55, the relative relative movement of the bus bar 50 and the holding unit 10 is restricted and temporarily fixed. Can be kept connected at predetermined intervals. As a result, the work of attaching the wiring module 1 to the single cell group 2 becomes much easier. Furthermore, the dimension shape of the contact part 56 and the convex part 26 is set appropriately, and the bus bar 50 and the holding unit 10 can be moved relative to each other by applying a force from the outside, so that the connection interval of the holding units 10 can be adjusted appropriately. It is configured. As a result, it is possible to cope with the positional deviation of the electrode terminal 4 in the left-right direction while dramatically improving the handleability of the wiring module 1.

  In the wiring module 1 according to the present embodiment, the contact surface 56A formed on the ridge portion of the contact portion 56 in the recess 55 is formed to be chamfered to form a curved surface. As a result, the external force required to move the adjacent holding units 10 relative to each other can be kept small, so that the connection interval of the holding units 10 can be easily adjusted.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the contact portion 56 is formed at the left and right corners of the recess 55, and the ridge portion to be the contact surface 56A is formed in a curved surface. However, the shape is limited to such a shape. is not. For example, as shown in FIG. 19, the both side edges of the recess may be inclined at a predetermined angle, and the contact portion may be formed so that the contact surface forms a tapered surface. Alternatively, a pair of hemispherical or conical projections having an appropriate spherical surface may be provided in the recess (engaged portion). A pair of protrusions are arranged at intervals that can be brought into contact with the convex part from both sides, and by applying a force from the outside to at least one of the adjacent holding units 10, the convex part becomes one of the protrusions as necessary. The temporary fixation can be released by overcoming the. Moreover, you may form at least one of a convex part (engagement part) and a recessed part (engaged part) so that elastic deformation is possible. For example, in the above-described embodiment, the convex portion 26 may be formed in a cantilever shape that can be elastically deformed in the thickness direction of each wall, like the retaining piece 27.
(2) In the above embodiment, the convex portion 26 is formed on the holding unit 10 and the concave portion 55 is formed on the bus bar 50. However, the present invention is not limited thereto, and the convex portion is formed on the bus bar 50. It is good also as a structure which forms a recessed part.
(3) The holding unit 12 of the holding unit 10 may be configured to hold the detection terminal connected to at least one of the positive electrode terminal 4A and the negative electrode terminal 4B together with the bus bar 50.
(4) The number of the single cells 3 included in the battery module M1 is not limited, and any number of single cells 3 may be provided as long as it is two or more.
(5) The power storage element is not limited to the unit cell 3, and the wiring module 1 may be attached to a power storage element group in which capacitors are arranged, for example.

DESCRIPTION OF SYMBOLS 1 ... Wiring module 2 ... Single cell group (electric storage element group)
3. Single cell (electric storage element)
4 ... Electrode terminal 10 ... Holding unit 20 ... Surrounding wall 26 ... Convex part (engagement part)
27 ... Retaining piece (Retaining part)
27A ... Locking surface 50 ... Bus bar (connection member)
55. Recess (engaged part)
56 ... Abutting portion 56A ... Abutting surface M1 ... Battery module (storage module)

Claims (5)

A wiring module attached to a power storage element group in which a plurality of power storage elements having positive and negative electrode terminals are arranged in a first direction from a direction orthogonal to the first direction,
A connecting member connected between the electrodes;
A holding unit for holding the connection member,
The holding unit is provided with an enclosing wall that surrounds the periphery of the connection member and opens in the mounting direction of the wiring module;
A wiring module in which an inner wall of the surrounding wall is provided with a retaining portion that is arranged on the attachment direction side of the connection member to prevent the connection member from coming off and bendable and deformable in the attachment direction.   The retaining portion is formed in a cantilever shape projecting from the inner wall to the attachment direction side of the connection member, and a projecting end side of the engagement surface that faces the connection member is opposed to the connection member. The wiring module according to claim 1, wherein the wiring module is inclined in a direction in proximity to the wire. A plurality of the holding units are arranged in the first direction and are provided in one of the connection member held in one holding unit and the holding unit adjacent thereto, and provided in the other. The engaged portion is engaged with a clearance so as to be movable in the first direction,
By temporarily contacting the engagement portion with the engagement portion, the connection member and the adjacent holding unit are temporarily fixed in a state in which free relative movement in the first direction is restricted, and The contact part which accept | permits the relative movement in said 1st direction when the force is applied to at least one of a connection member and the said adjacent holding unit from the outside is provided in Claim 1 or Claim 2. The described wiring module.   The engaging portion is formed to protrude from an inner wall of the surrounding wall of the holding unit, and the engaged portion is formed in a concave shape at an edge of the connection member, and the contact portion and the engaging portion The wiring module according to claim 3, wherein at least one of the contact surfaces that contact each other has a curved surface.   The engaging portion is formed to protrude from an inner wall of the surrounding wall of the holding unit, and the engaged portion is formed in a concave shape at an edge of the connection member, and the contact portion and the engaging portion The wiring module according to claim 3, wherein at least one of the contact surfaces that contact each other forms a tapered surface.

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