JP2012243648A - Battery pack wiring module - Google Patents

Abstract

A battery wiring module having improved efficiency of assembling work to a cell group is provided.
A battery wiring module (20) attached to a cell group (11) in which a plurality of cells (10) having positive and negative electrode terminals (12) are arranged side by side includes a plurality of bus bars (21) connected to the electrode terminals (12), The resin protector 30 is provided, and the resin protector 30 is provided with a bus bar insertion port 38 into which the bus bar 21 is inserted in a direction intersecting with the assembly direction of the resin protector 30 to the unit cell group 11. .
[Selection] Figure 5

Description

  The present invention relates to a battery wiring module.

In battery modules for electric vehicles and hybrid vehicles, a plurality of single cells having positive and negative electrode terminals are arranged side by side. In such a battery module, a plurality of single cells are electrically connected by connecting a positive electrode terminal (positive electrode terminal) and a negative electrode terminal (negative electrode terminal) with a bus bar. .
In order to electrically connect a plurality of single cells, for example, a battery wiring module as described in Patent Document 1 is used.

Japanese Unexamined Patent Publication No. 2011-8955

In the battery wiring module described in Patent Document 1, a plurality of connection units each having a bus bar holding part are connected, and after the bus bar is accommodated in the bus bar holding part of each connection unit from above, the electrode terminals of the unit cells are formed. The connection unit is arranged on the terminal forming surface, and each bus bar and the electrode terminal are connected.
However, in the battery wiring module configured as described above, the bus bar is accommodated from a direction parallel to the direction in which the connection unit is assembled to the unit cell group. In some cases, the bus bar accommodated in the bus bar holding portion of the connection unit is pushed up and dropped from the connection unit due to a collision with the terminal forming surface or the electrode terminal of the single cell constituting the single cell group. When the bus bar is dropped from the connection unit, the bus bar needs to be accommodated again in the bus bar holding portion of the connection unit, which causes a problem of poor work efficiency.

  This invention is completed based on the above situations, Comprising: It aims at providing the battery wiring module which improved the efficiency of the assembly | attachment work to a cell group.

  In order to solve the above problems, the present invention is a battery wiring module attached to a unit cell group in which a plurality of unit cells having positive and negative electrode terminals are arranged, and a plurality of bus bars connected to the electrode terminals, And a resin protector for holding the bus bar, and the resin protector is provided with a bus bar insertion port for inserting the bus bar in a direction intersecting with an assembly direction of the resin protector to the unit cell group. And

  In the present invention, the resin protector is provided with a bus bar insertion slot for inserting the bus bar in a direction intersecting the assembly direction of the resin protector to the unit cell group. Therefore, in the present invention, even when the resin protector collides with the terminal formation surface or electrode terminal of the unit cell, the bus bar is difficult to be pushed up, so that the bus bar is dropped during assembly to the unit cell group. Is prevented. As a result, according to the present invention, it is possible to provide a battery wiring module in which the efficiency of the assembling work to the cell group is improved.

The present invention may have the following configurations.
The resin protector may include a plurality of connection units in which the bus bar insertion port is provided in a holding portion that holds the bus bar.
If it is such a structure, even if a resin protector is a structure provided with a some connection unit, the efficiency of the assembly | attachment operation | work to a cell group can be improved.

It is good also as a structure which provided the guide part which guides the said bus bar ahead in the insertion direction of the said bus bar from the said bus-bar insertion port in the said holding | maintenance part of the said connection unit.
With such a configuration, the work of inserting the bus bar can be performed smoothly, so that workability is improved.

A retaining portion for retaining the bus bar with respect to the holding portion of the connection unit may be formed on the bus bar.
With such a configuration, the bus bar inserted from the bus bar insertion opening is prevented from being detached from the holding portion, so that it is possible to reliably prevent the bus bar from falling off.

The holding portion includes a wall portion disposed along a peripheral edge of the bus bar and a placement portion on which the bus bar is placed in a horizontal posture, and the bus bar is inserted between the wall portion and the placement portion. An opening may be provided, and in the bus bar insertion opening, the wall portion and the mounting portion may be provided at positions shifted in the insertion direction of the bus bar.
With such a configuration, since the placement portion and the wall portion are provided at positions shifted in the insertion direction of the bus bar at the insertion port of the bus bar, it is easy to insert the bus bar into the bus bar insertion port, and the bus bar after insertion Is guided forward in the insertion direction, so that the bus bar can be inserted smoothly.

  In the bus bar insertion port, a guide surface for guiding insertion of the bus bar may be formed on at least one of the wall portion and the placement portion. With such a configuration, the insertion of the bus bar is guided, so that the bus bar can be inserted more smoothly.

Among the plurality of connection units, one connection unit and another connection unit may be connected to each other via the bus bar.
With such a configuration, when the connecting units are arranged and the bus bar is inserted into the bus bar insertion port, a plurality of connecting units are connected via the bus bar. As a result, according to the above configuration, a separate connection operation between the connection units is not required, and the work efficiency is excellent.

The plurality of connecting units are formed by integrally connecting the plurality of connecting units via an interconnecting part at the time of molding, and the interconnecting part is cut after the bus bar is inserted into the bus bar insertion port. May be.
With such a configuration, it is not necessary to arrange a plurality of connecting units when inserting the bus bar into the connecting unit, so that work efficiency is excellent.

The plurality of bus bars are inserted into the bus bar insertion port of the plurality of connection units connected by the interconnection part in a state where the bus bars are connected by the bus bar connection part, and the bus bar connection part connects the bus bar to the connection unit. It may be cut after being inserted into the bus bar insertion opening.
With such a configuration, a plurality of bus bars can be collectively arranged with respect to a plurality of connecting units, and the work efficiency is excellent.

It is good also as a structure which provided a pair of protrusion part in the both sides of the cutting part formed by the cutting | disconnection of the said connection part of the said connection unit.
Such a configuration eliminates the need for burr processing that may occur in the cut portion formed after the interconnection portion is cut.

  ADVANTAGE OF THE INVENTION According to this invention, the battery wiring module which improved the efficiency of the assembly | attachment work to a single battery group can be provided.

FIG. 1 is a plan view of a battery module including the battery wiring module according to the first embodiment. FIG. 2 is a perspective view of the battery module before tightening with a nut. FIG. 3 is a perspective view showing a state in which the bus bar is accommodated in the connecting unit. FIG. 4 is a plan view showing a state in which the bus bar is accommodated in the connecting unit. FIG. 5 is a cross-sectional view taken along line AA in FIG. 6 is a cross-sectional view taken along line BB in FIG. FIG. 7 is a side view showing a state where the bus bar is accommodated in the connecting unit. 8 is a cross-sectional view taken along the line CC of FIG. FIG. 9 is a perspective view showing the connecting unit. FIG. 10 is a plan view showing the connecting unit. FIG. 11 is a front view showing the connecting unit. FIG. 12 is a side view showing the connecting unit. FIG. 13 is a perspective view showing a state before a plurality of bus bars connected by the bus bar connecting portion are arranged in a connecting unit connected by the interconnecting portion. FIG. 14 is a partially enlarged perspective view of FIG. FIG. 15 is a cross-sectional view showing a state in which the bus bar is disposed in the vicinity of the bus bar insertion opening of the connecting unit. FIG. 16 is a perspective view showing a state when a plurality of bus bars connected by the bus bar connecting portion are inserted into the bus bar insertion port of the connecting unit connected by the interconnecting portion. FIG. 17 is a perspective view showing a state when the bus bar connecting portion is cut.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. The battery wiring module 20 according to the present embodiment is attached to a unit cell group 11 in which a plurality of (in the present embodiment, 24) unit cells 10 having positive and negative electrode terminals 12 are arranged. Hereinafter, the positive electrode terminal 12 is referred to as a positive electrode terminal 12A, and the negative electrode terminal 12 is referred to as a negative electrode terminal 12B.

  A battery module M in which the battery wiring module 20 of the present embodiment is attached to the unit cell group 11 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 10 constituting the single cell group 11 are connected in series by electrically connecting the positive terminal 12 </ b> A and the negative terminal 12 </ b> B of the different single cells 10 by the battery wiring module 20. In the following description, the upper side in FIGS. 2, 5 to 7, 11, 12, and 15 is the upper side and the lower side is the lower side.

(Single cell 10)
The unit cell 10 has a flat rectangular parallelepiped shape. As shown in FIGS. 1 and 2, a positive electrode terminal 12 </ b> A and a negative electrode terminal 12 </ b> B are formed on the upper surface 10 </ b> A of the unit cell 10. The electrode terminal 12 includes a pedestal (not shown) made of a metal plate material, and an electrode post 13B projecting in a round bar shape upward from the pedestal. A thread 14 is formed on the surface of the electrode post 13B as shown in FIG. The plurality of unit cells 10 are arranged so that the positive electrode terminal 12A and the negative electrode terminal 12B are adjacent to each other. The electrode post 13 </ b> B is inserted into a through hole 23 (details will be described later) of the bus bar 21 and is tightened with a nut 15.

(Battery wiring module 20)
The battery wiring module 20 includes a plurality of bus bars 21 having a pair of through holes 23 (connection portions) that are inserted and connected to the electrode posts 13B and 13B of the positive electrode terminal 12A and the negative electrode terminal 12B of the unit cell 10, respectively. And a resin protector 30 made of a synthetic resin having a holding portion 32 for holding the.
In the present embodiment, the resin protector 30 includes a plurality of connection units 31, and the plurality of connection units 31 are connected via the bus bars 21 in the direction in which the cells 10 are arranged.

(Bus bar 21)
The bus bar 21 is formed by pressing a plate material made of metal such as copper, copper alloy, stainless steel, or aluminum into a predetermined shape. As shown in FIG. 3, each bus bar 21 has a substantially rectangular shape. In the present embodiment, details will be described later, but after the plurality of bus bars 21 are connected by the bus bar connecting portion 22 and inserted from the bus bar insertion port 38 of the connecting unit 31, the bus bar connecting portion 22 is cut, Individual bus bars 21 are configured (see FIGS. 13, 14, 16 and 17). The surface of the bus bar 21 may be plated with metal such as tin or nickel. 13, FIG. 14, FIG. 16 and FIG. 17 are perspective views of the connecting unit 31 and the bus bar 21 as seen from the back side (surface side arranged on the upper surface 10A of the unit cell 10).

  A pair of through holes 23 are formed in the bus bar 21 at a predetermined interval. In the through hole 23, the positive terminal 12A and the negative terminal 12B of the unit cell 10 are respectively inserted. The through hole 23 in the present embodiment has a circular shape when viewed from above. The pair of through holes 23 are formed at a predetermined interval. In the present embodiment, the predetermined interval is set to the pitch between the adjacent positive electrode terminal 12A and negative electrode terminal 12B. The inner diameter dimension of the through hole 23 is set to be the same or slightly larger than the dimension obtained by adding the tolerance of the pitch between the adjacent positive electrode terminal 12A and the negative electrode terminal 12B to the outer diameter dimension of the positive electrode terminal 12A and the negative electrode terminal 12B. Yes.

  As shown in FIG. 3, the bus bar 21 is formed with an oval hole 24 along with each through hole 23. The oval hole 24 is a detection terminal connection hole 24 to which the voltage detection terminal 50 is connected. Of the pair of long sides of the bus bar 21, the bus bar 21 is connected to both ends of the long side on the side where the detection terminal connection hole 24 is formed, as shown in FIGS. 3 to 5. 21. A retaining protrusion 25 (an example of a retaining part) is formed to project upward from the rear wall part 35 (back wall part 35 in FIG. 4) in the insertion direction.

  In addition, of the pair of long sides of the bus bar 21, a recess 26 that is cut out in a square shape is formed at the center of the long side where the retaining protrusion 25 is formed. The recessed portion 26 is a portion where the bus bar connecting portion 22 for connecting the plurality of bus bars 21 is formed (see FIGS. 13, 14 and 16). The bus bar connecting portions 22 formed in the recessed portions 26 are cut after inserting the plurality of bus bars 21 into the bus bar insertion ports 38 of the corresponding connecting units 31 (see FIG. 17). Burrs may occur in the cut portion 22A formed by cutting the bus bar connecting portion 22, but in this embodiment, the cut portion 22A of the bus bar connecting portion 22 is formed in the recess 26. Therefore, burr processing is unnecessary.

  Of the pair of long sides of the bus bar 21, in the substantially central portion of the long side where the retaining protrusion 25 is not formed, as shown in FIG. 4, a range wider than the opposing long side recess 26. A recess 27 cut out in a square shape is formed. The bus bar 21 is locked to the connecting unit 31 by the locking protrusion 39 provided on the connecting unit 31 being locked to the end 27A of the recess 27 of the bus bar 21 (see FIG. 8). ).

(Connecting unit 31)
As shown in FIG. 1, the plurality of bus bars 21 are held by holding portions 32 of the connection unit 31. Among the plurality of connection units 31, one connection unit 31 and the other connection unit 31 are connected to each other via the bus bar 21.

  The connection unit 31 includes two holding portions 32 and 32 that open upward and receive and hold the bus bar 21, and a wire receiving portion 41 that stores the electric wire 54 connected to the voltage detection terminal 50. In FIG. 1, end connection units 31 </ b> A and 31 </ b> A each having only one holding portion 32 are disposed at the left and right ends of the battery wiring module 20 on the back side.

  The holding part 32 is formed in a size that can accommodate approximately half of the bus bar 21. As shown in FIGS. 4, 9, and 10, the bottom portion 33 of the holding portion 32 is opened downward leaving the placement portion 33 on which the peripheral portion of the bus bar 21 is placed. Further, an insulating wall 34 that partitions adjacent bus bars 21 is formed between the two holding portions 32 and 32 so as to rise upward. The holding portion 32 includes an insulating wall 34, a rear wall 35 (rear wall 35) in FIG. 4, left and right side walls 36 (side walls 36) in FIG. 4, and a front wall 37 (front wall 37 in FIG. 4). ), And a wall 35 </ b> A between the rear wall 35 and the side wall 36.

  The rear wall 35, the front wall 37, and the insulating wall 34 of the holding portion 32 are arranged along the peripheral edge of the bus bar 21 (an example of a wall portion). Specifically, the rear wall 35 and the front portion 37 of the holding portion 32 are arranged along a part of the long side of the bus bar 21, and the insulating wall 34 is arranged along the short side of the bus bar 21 (the wall portion). One case).

  The height of the rear wall 35, the wall 35 </ b> A (details will be described later) and the insulating wall 34 of the holding portion 32 is higher than the upper end portion of the electrode terminal 12 when the battery wiring module 20 is connected to the unit cell group 11. Is set. Thereby, it can suppress that a tool etc. contact 12 A of positive electrode terminals and the negative electrode terminal 12B, and the positive electrode terminal 12A and the negative electrode terminal 12B are short-circuited via a tool etc. In the present embodiment, the height of the rear wall 35 and the wall 35A of the holding portion 32 and the height of the insulating wall 34 are set to be the same, but may be different as necessary.

  As shown in FIG. 4, the insulating wall 34 has two holding protrusions 34 </ b> A that are arranged on the upper side of the bus bar 21 accommodated in the holding portion 32 and have a function of holding the bus bar 21 together with the mounting portion 33. 34 </ b> A is formed protruding toward the inside of each holding portion 32. At the lower end of the insulating wall 34, as shown in FIG. 5, there is a mounting protrusion 34B for mounting the bus bar 21 at a position shifted in the insertion direction of the bus bar 21 from directly below the two holding protrusions 34A, 34A. Is formed. Between the holding protrusion 34A and the mounting protrusion 34B, the short side portion of the bus bar 21 is disposed as shown in FIGS.

  Further, the holding protrusion 34A and the mounting protrusion 34B formed on the insulating wall 34 insert the bus bar 21 into the holding part 32 from the bus bar insertion port 38 when the bus bar 21 is inserted. It functions as a guide part that guides forward (front wall 37 side) in the insertion direction while maintaining a posture parallel to the direction (an example of a guide part).

  In the present embodiment, the walls 35, 35 </ b> A, 36, and 37 of the holding portion 32 are chamfered in a top view. Specifically, in the present embodiment, a chamfered wall 35 </ b> A is formed between the rear wall 35 and the side wall 36 of the holding portion 32 and is connected at an obtuse angle to the rear wall 35 and the side wall 36. By providing a chamfered wall 35 </ b> A between the rear wall 35 and the side wall 36, it is possible to prevent interference between the cutting tool and the walls 35 and 36 of the connecting unit 31 when cutting the bus bar connecting portion 22.

  A bus bar insertion port 38 is formed between the walls 35, 35 </ b> A, 36 of the holding portion 32 and the placement portion 33. In this embodiment, the bus bar insertion port 38 is provided so that the bus bar 21 can be inserted from the wall 35 side of the holding portion 32 in the left direction as shown in FIGS. 12 and 15. That is, the bus bar insertion port 38 is provided so that the bus bar 21 can be inserted in a direction that intersects the direction in which the connecting unit 31 is assembled to the unit cell group 11 (the vertical direction in the present embodiment).

  The walls 35, 35 </ b> A, 36, and 37 of the holding portion 32 are provided at positions shifted outward from directly above the placement portion 33, as shown in FIGS. 5, 6, and 10. That is, in the bus bar insertion port 38, the walls 35 and 35A of the holding portion 32 and the placement portion 33 are provided at positions shifted forward and backward in the bus bar insertion direction, and are in a positional relationship such that they do not overlap vertically. Therefore, the bus bar 21 can be easily inserted from the bus bar insertion port 38, and the bus bar 21 can be smoothly moved forward.

  Moreover, in the connection unit 31, as shown in FIG. 11 (the figure which showed the connection unit 31 from the bus-bar insertion port 38 side) and FIG. 12 (side view of the connection unit 31), the end surface of the bottom part 33 in the bus-bar insertion port 38 In addition, inclined surfaces 33A and 35B (an example of a guide surface) for guiding the insertion of the bus bar 21 are formed on end surfaces of the rear wall 35 (see FIGS. 5 and 11).

  As shown in FIG. 8, a locking projection 39 that is locked to the end 27 </ b> A of the recess 27 of the bus bar 21 is provided at the lower end portion of the front wall 37 in the insertion direction of the bus bar 21 of the holding portion 32. 32 is formed so as to protrude in the inner direction. As shown in FIG. 8, a clearance in the connecting direction of the connecting unit 31 is formed between the locking projection 39 of the holding part 32 and the recess 27 of the bus bar 21, whereby the connecting unit 31 is connected to the bus bar. 21 is relatively movable.

(Voltage detection terminal 50)
In one holding part 32 of the holding parts 32 of the connection unit 31, a voltage detection terminal 50 is arranged on the bus bar 21 so as to detect the voltage of the unit cell 10. The voltage detection terminal 50 is formed by pressing a metal plate material such as copper, copper alloy, stainless steel, or aluminum into a predetermined shape. The surface of the voltage detection terminal 50 may be plated with a metal such as tin or nickel.

  In the present embodiment, the voltage detection terminal 50 has a substantially rectangular shape, and a terminal insertion hole (not shown) through which the positive electrode terminal 12A or the negative electrode terminal 12B is inserted is formed near the center. The terminal insertion hole of the voltage detection terminal 50 is disposed so as to overlap with the through hole 23 of the bus bar 21. The voltage detection terminal 50 is provided with a connection protrusion 52 that is inserted into and connected to the detection terminal connection hole 24 of the bus bar 21.

  The voltage detection terminal 50 is formed with a barrel portion 53 connected to the end of the electric wire 54, and is crimped so that the barrel portion 53 is wound around the core wire of the electric wire 54. 54 is electrically connected. The electric wire 54 is connected to an ECU or the like (not shown). The voltage of the unit cell 10 is detected by the ECU or the like.

  In the connection unit 31, a barrel holding part 40 that holds the barrel part 53 of the voltage detection terminal 50 and an electric wire accommodation part 41 that accommodates the electric wire 54 connected to the voltage detection terminal 50 are formed. The electric wire accommodating portion 41 includes a pair of side wall portions 42 and 42 that are cut with respect to the upper surface 10 </ b> A of the unit cell 10, and a bottom wall portion 43 that connects the pair of side wall portions 42 and 42. The electric wire 54 is arranged in a groove-shaped portion 44 formed by the pair of side wall portions 42 and 42 and the bottom wall portion 43.

  A pair of holding claws 45 and 45 for holding the electric wire 54 from above are formed on the pair of side wall portions 42 and 42 of the electric wire housing portion 41. Of the pair of side wall portions 42, 42 of the electric wire housing portion 41, the side wall portion 42 </ b> A opposite to the holding portion 32 (outside) covers a part of the electric wire housing portion 41 and prevents the electric wire 54 from jumping out. 46 is provided via a hinge 47.

  Further, of the pair of side wall portions 42, 42 of the wire accommodating portion 41, the outer wall surface of the outer side wall portion 42 </ b> A is provided with an interconnecting portion 48 that connects the plurality of connecting units 31 when the connecting unit 31 is molded. However, the interconnecting portion 48 is cut after the bus bar 21 is arranged in the connecting unit 31. When the interconnecting portion 48 is cut, burrs may occur after cutting. In this embodiment, a pair of protrusions 49, 49 are provided at positions on both sides of the cutting portion 48A formed after the interconnecting portion 48 is cut. Therefore, burr processing is unnecessary.

(Method for manufacturing battery wiring module 20)
Hereinafter, an example of the manufacturing method of the battery wiring module 20 of this embodiment is demonstrated.
First, a plurality of bus bars 21 and a plurality of connection units 31 are respectively produced. The metal plate material is pressed to produce a plurality of bus bars 21 connected by the bus bar connecting portion 22. The plurality of connecting units 31 are formed by injection molding a synthetic resin with a mold (not shown). At the time of molding, the plurality of connecting units 31 are integrally connected by the interconnecting portion 48 (see FIGS. 13 and 14). Here, in this embodiment, the walls 35, 35A, 36, and 37 of the holding portion 32 and the bottom portion 33 (mounting portion 33) form the connecting unit 31 that does not overlap in the vertical direction. This eliminates the need for use, reduces the cost of mold manufacture, and eliminates the need for a space for sliding the slide mold.

  As shown in FIGS. 13 and 15, the plurality of bus bars 21 in the connected state produced as described above are connected to the bus bar insertion port 38 side of the plurality of connecting units 31 in a state of being integrally connected by the interconnecting portion 48. To place. Here, FIG. 15 is a cross-sectional view showing a state in which the bus bar 21 is disposed in the bus bar insertion port 38 of the connection unit 31.

  Next, the plurality of bus bars 21 are respectively inserted into the bus bar insertion openings 38 of the corresponding connecting units 31. In the present embodiment, at the bus bar insertion port 38, the walls 35, 35A of the holding portion 32 and the placement portion 33 are provided so as to be shifted in the insertion direction of the bus bar 21, so that the bus bar 21 can be easily inserted. .

  In addition, an inclined surface 35B is formed on the end surface of the rear wall 35 in the bus bar insertion port 38, an inclined surface 33A is formed on the end surface of the bottom portion 33, and the walls 35, 35A, 36, and 37 of the holding portion 32 are formed. Since the bottom portion 33 and the bottom portion 33 are provided so as not to overlap each other, the bus bar 21 inserted from the bus bar insertion port 38 is guided into the holding portion 32, and the insertion operation can be performed smoothly. The bus bar 21 inserted from the bus bar insertion port 38 is maintained in a substantially parallel posture with respect to the insertion direction between the bottom 33 of the holding portion 32 and the holding projection 34A (in the direction indicated by the arrow X in FIG. 14 ( It is guided in the direction of the front wall 37).

  When the retaining protrusion 25 of the bus bar 21 comes into contact with the lower end of the rear wall 35 of the holding portion 32 of the connecting unit 31, the retaining protrusion 25 is elastically deformed downward. When the locking protrusion 39 of the holding part 32 of the connecting unit 31 is arranged in the recess 27 of the bus bar 21, the retaining protrusion 25 of the bus bar 21 is arranged in the holding part 32 and is elastically restored, so that the bus bar 21 is It is prevented from coming off by the rear wall 35 of the holding portion 32 (see FIG. 5). At this time, a clearance in the connecting direction of the connecting unit 31 is formed between the end portion 27A of the recess 27 of the bus bar 21 and the locking protrusion 39 of the holding portion 32 of the connecting unit 31 as shown in FIG. Thus, the connecting unit 31 can move relative to the bus bar 21.

  When all the bus bars 21 are inserted into the bus bar insertion openings 38 of the connecting unit 31 and the bus bars 21 are prevented from being detached from the holding portions 32, a plurality of states connected by the bus bar connecting portions 22 as shown in FIG. The bus bar 21 is attached to the plurality of connecting units 31 connected by the interconnecting portion 48.

Next, the interconnecting portion 48 that connects the plurality of connecting units 31 and the bus bar connecting portion 22 that connects the plurality of bus bars 21 are cut.
Here, in this embodiment, since the walls 35, 35A, 36, and 37 constituting the holding portion 32 of the connection unit 31 are chamfered when viewed from the top, when the bus bar connection portion 22 is cut, it is used for cutting. The cutting work can be smoothly performed without interference between the tool and the walls 35 and 36 of the holding portion 32 of the connecting unit 31.

  When the cutting and removing operation of the interconnecting portion 38 and the bus bar connecting portion 22 is completed, the interconnecting portion 48 and the bus bar connecting portion 22 are removed and the connecting unit 31 is connected by the bus bar 21 as shown in FIG.

  By the way, burrs may occur in the cutting portion 48A formed by the cutting operation of the interconnecting portion 48 and the cutting portion 22A formed by the cutting operation of the bus bar connecting portion 22. In this embodiment, since a pair of protrusions 49 and 49 are formed on both sides of the cut portion 48A of the interconnecting portion 48 of the connecting unit 31, even if a burr is generated in the cut portion 48A, the removal of the burr is performed. No processing is necessary. Further, in the present embodiment, since the cut portion 22A of the bus bar connecting portion 22 is formed in the concave portion 27, even if a burr is generated in the cut portion 22A, the burr removal process is unnecessary.

  Next, the voltage detection terminal 50 is attached to the connection unit 31. Specifically, the barrel portion 53 of the voltage detection terminal 50 is caulked to the end portion of the electric wire 54, and one of the two holding portions 32, 32 formed in the connection unit 31 is in one holding portion 32. The voltage detection terminal 50 is accommodated from above and connected to the bus bar 21. And if the barrel part 53 of the voltage detection terminal 50 is hold | maintained at the barrel holding part 40 of the connection unit 31, the electric wire 54 will be arrange | positioned in the electric wire accommodating part 41, and the cover part 46 of the electric wire accommodating part 41 will be closed, this embodiment will be described. The battery wiring module 20 is obtained. 1 and 2 show a state where the lid 46 is opened.

  The battery wiring module 20 of the present embodiment manufactured as described above is arranged on the unit cell group 11 arranged with the electrode terminals 12 facing upward, and each unit is inserted into the through hole 23 of the bus bar 21. When the electrode terminal 12 (electrode post 13B) of the battery 10 is inserted and the nut 15 is screwed, the battery module M is completed. Here, manufacturing tolerances and assembly tolerances between the adjacent positive electrode terminal 12 </ b> A and negative electrode terminal 12 </ b> B are absorbed by the through holes 23 formed in the bus bar 21. However, there is a concern that when the plurality of single cells 10 are arranged, the above-mentioned tolerances are integrated and cannot be absorbed by the through holes 23 formed in the bus bar 21. In the present embodiment, a clearance in the connecting direction of the connecting unit 31 is formed between the locking protrusion 39 of the holding portion 32 and the recess 27 of the bus bar 21, as shown in FIG. Since the connecting unit 31 is movable relative to the bus bar 21, the integrated tolerance can be absorbed.

(Operation and effect of the embodiment)
Hereinafter, the operation and effect of the present embodiment will be described.
In the present embodiment, the holding portion 32 of the connection unit 31 is provided with a bus bar insertion port 38 into which the bus bar 21 is inserted in a direction crossing the direction in which the connection unit 31 is assembled to the unit cell group 11. Therefore, in this embodiment, even if the connection unit 31 collides with the upper surface 10A (terminal forming surface) of the unit cell 10 and the electrode terminal 12, the bus bar 21 is not easily pushed up. The bus bar 21 is prevented from falling off during the assembly work. As a result, according to the present embodiment, it is possible to provide the battery wiring module 20 in which the efficiency of the assembly work to the unit cell group 11 is improved.

  Further, according to the present embodiment, the holding protrusion 34 </ b> A and the mounting protrusion that function as a guide portion that guides the bus bar 21 to the rear in the insertion direction of the bus bar 21 from the bus bar insertion port 38 to the holding portion 32 of the connection unit 31. Since the portion 34B is provided, the insertion work of the bus bar 21 can be performed smoothly, and workability is improved.

  Further, according to the present embodiment, the bus bar 21 is formed with the retaining protrusion 25 for retaining the bus bar 21 with respect to the holding portion 32 of the connecting unit 31, so that the bus bar 21 is inserted from the bus bar insertion port 38. Since the bus bar 21 is prevented from being detached from the holding portion 32, it is possible to reliably prevent the bus bar 21 from falling off.

  Further, according to the present embodiment, the bus bar insertion port 38 is provided between the wall 35, 35 </ b> A (wall portion) of the holding portion 32 and the mounting portion 33, and the wall portion 35 and the mounting portion are provided at the bus bar insertion port 38. 33 is provided at a position shifted in the insertion direction of the bus bar 21, so that the insertion of the bus bar 21 into the bus bar insertion port 38 is facilitated, and the inserted bus bar 21 is guided forward in the insertion direction. Can be performed smoothly.

  Further, according to the present embodiment, in the bus bar insertion port 38, the inclined surfaces 35B and 33A for guiding the insertion of the bus bar 21 are formed on both the wall portion 35 and the placement portion 33, respectively. Furthermore, it can be performed smoothly.

  Moreover, in this embodiment, since the one connection unit 31 and the other connection unit 31 are mutually connected via the bus bar 21 among the some connection units 31, the connection unit 31 is put in order and a bus-bar insertion port If the bus bar 21 is inserted into 38, a plurality of connecting units 31 are connected via the bus bar 21. As a result, according to the present embodiment, a separate connection operation between the connection units 31 is not required, and the work efficiency is excellent.

  Further, according to the present embodiment, the plurality of connecting units 31 are formed by integrally connecting the plurality of connecting units 31 via the interconnecting portion 48 at the time of molding, and the bus bar 21 is formed in the bus bar insertion port 38. Since the interconnecting portion 48 is cut after being inserted, it is not necessary to arrange a plurality of connecting units 31 when the bus bar 21 is inserted into the connecting unit 31, so that the work efficiency is excellent.

  According to the present embodiment, the plurality of bus bars 21-are inserted into the bus bar insertion ports 38 of the plurality of connection units 31 connected by the interconnecting portions 48 in a state where the bus bars 21-are connected by the bus bar connecting portions 22. Since the bus bar 21 is cut after being inserted into the bus bar insertion port 38 of the connection unit 31, a plurality of bus bars 31 can be collectively arranged with respect to the plurality of connection units 21, and the work efficiency is excellent.

  According to the present embodiment, since the pair of protrusions 49 and 49 are provided on both sides of the cutting portion 48A formed by cutting the interconnection portion 48 of the connection unit 31, after the interconnection portion 48 is cut. A burr treatment that may occur in the cut portion 48A to be formed becomes unnecessary.

  In addition, according to the present embodiment, in a state where the bus bar 21 is locked to the connecting unit 31, the connecting unit 31 is movable relative to the bus bar 21, so that a manufacturing intersection or an assembly intersection can be performed. Can be absorbed.

<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 resin protector including a plurality of connecting units is shown. However, the resin protector may be a single plate that can hold all the bus bars.
(2) In the above embodiment, the connection unit is shown in which the guide part for guiding the bus bar forward in the insertion direction is provided in the holding part, but the guide part may not be provided.
(3) Although the bus bar having the retaining protrusion is shown in the above embodiment, the bus bar may not have the retaining protrusion.
(4) In the above embodiment, in the bus bar insertion port, the wall portion of the holding portion and the placement portion are formed at positions shifted in the insertion direction of the bus bar. The mounting portion may be formed at a position that overlaps with the bus bar insertion opening.
(5) In the above-described embodiment, the end surfaces of both the wall portion and the placement portion are provided with the inclined surfaces that guide the insertion of the bus bar. However, the inclined portions are not provided on both the wall portion and the placement portion. A thing or what provided the inclined surface only in any one may be sufficient.
(6) In the above-described embodiment, the configuration in which one connection unit and the other connection unit among the plurality of connection units are connected to each other via the bus bar is shown. However, the connection unit is not connected to the bus bar. The structure connected with the other connection unit may be sufficient.
(7) In the above embodiment, a manufacturing method including a step of inserting a plurality of bus bars in a connected state into bus bar insertion ports of a plurality of connected units in the connected state is shown, but the present invention is not limited to this. A plurality of unconnected bus bars may be inserted into the bus bar insertion ports of a plurality of connected units in a connected state, or a plurality of unconnected connection units are arranged and a bus bar is inserted into each bus bar insertion port. (It may be connected or not connected) may be inserted.
(8) In the above-described embodiment, a pair of protrusions are provided on both sides of the cut part formed after cutting the interconnection part of the connection unit. The protrusion may not be provided.
(9) In the above-described embodiment, the wall of the holding portion has a chamfered shape when viewed from the top. However, the holding portion may include a wall portion in which the rear wall and the side wall are vertically or acutely connected. (10) Although the battery wiring module having the configuration including the voltage detection terminal has been described in the above embodiment, the battery detection module may not include the voltage detection terminal.
(11) In the above-described embodiment, the connection unit having the electric wire accommodating portion is shown, but the electric wire accommodating portion may not be provided.

DESCRIPTION OF SYMBOLS 10 ... Single cell 11 ... Single cell group 12 ... Electrode terminal 12A ... Positive electrode terminal 12B ... Negative electrode terminal 20 ... Battery wiring module 21 ... Bus bar 22 ... Bus-bar connection part 25 ... Retaining prevention protrusion (Retaining part)
DESCRIPTION OF SYMBOLS 30 ... Resin protector 31 ... Connection unit 32 ... Holding part 33 ... Bottom part (mounting part)
33A ... Inclined surface (guide surface)
34. Insulating wall (wall)
34A ... Holding projection (guide portion)
34B ... Placement protrusion (guide part)
35, 37 ... wall 35B ... inclined surface (guide surface)
38 ... Busbar insertion port 39 ... Locking projection 48 ... Interconnection portion 48A ... Cut portion (formed after cutting the interconnection portion) 49 ... Projection

Claims (10)

A battery wiring module attached to a unit cell group in which a plurality of unit cells having positive and negative electrode terminals are arranged,
A plurality of bus bars connected to the electrode terminals, and a resin protector that holds the bus bars,
A battery wiring module, wherein the resin protector is provided with a bus bar insertion slot into which the bus bar is inserted in a direction intersecting a direction in which the resin protector is assembled to the unit cell group. 2. The battery wiring module according to claim 1, wherein the resin protector includes a plurality of connection units in which the bus bar insertion port is provided in a holding portion that holds the bus bar. The battery wiring module according to claim 2, wherein a guide portion that guides the bus bar forward from the bus bar insertion port in the insertion direction of the bus bar is provided in the holding portion of the connection unit. The battery wiring module according to claim 2 or 3, wherein a retaining portion for retaining the bus bar with respect to the holding portion of the connecting unit is formed on the bus bar. The holding portion includes a wall portion arranged along a peripheral edge of the bus bar, and a placement portion on which the bus bar is placed in a horizontal posture,
The bus bar insertion port is provided between the wall portion and the mounting portion,
5. The battery wiring according to claim 2, wherein, in the bus bar insertion opening, the wall portion and the placement portion are provided at positions shifted in the insertion direction of the bus bar. 6. module. 6. The battery wiring module according to claim 5, wherein a guide surface for guiding insertion of the bus bar is formed on at least one of the wall portion and the placement portion in the bus bar insertion port. 6. The connection unit according to claim 2, wherein among the plurality of connection units, one connection unit and another connection unit are connected to each other via the bus bar. Battery wiring module. The plurality of connecting units are formed by integrally connecting the plurality of connecting units via an interconnecting part at the time of molding, and the interconnecting part is cut after the bus bar is inserted into the bus bar insertion port. The battery wiring module according to any one of claims 2 to 7, wherein the battery wiring module is provided.   The plurality of bus bars are inserted into the bus bar insertion port of the plurality of connection units connected by the interconnection part in a state where the bus bars are connected by the bus bar connection part, and the bus bar connection part connects the bus bar to the connection unit. The battery wiring module according to claim 8, wherein the battery wiring module is cut after being inserted into the bus bar insertion opening. The battery wiring module according to claim 8 or 9, wherein a pair of protrusions are provided on both sides of a cut portion formed by cutting the interconnecting portion of the connecting unit.

Images