JP2013105571A - Battery wiring module - Google Patents

Abstract

A battery wiring module capable of easily adjusting a shift in pitch between adjacent electrode terminals is provided.
A battery wiring module 20 attached to a unit cell group 10 in which a plurality of unit cells 11 having positive and negative electrode terminals 12 are arranged includes a plurality of bus bars 21 connected to the electrode terminals 12 and a bus bar 21. And a resin protector 30 made of an insulating resin having a holding portion 32 for holding. The bus bar 21 is held by the holding unit 32 so as to be movable in the arrangement direction of the cells 11.
[Selection] Figure 1

Description

  The present invention relates to a battery wiring module.

  In battery modules for electric vehicles and hybrid vehicles, a large number of single cells are connected side by side in order to increase the output. A plurality of unit cells are connected in series or in parallel by connecting electrode terminals of adjacent unit cells with a connecting member such as a bus bar.

  When assembling the battery module having the above-described configuration, since it is necessary to connect the electrode terminals at a plurality of locations with connecting members, a complicated operation of repeatedly connecting the connecting members between the electrode terminals is necessary.

  Therefore, depending on the number of electrode terminals to be connected, it is conceivable to form a battery connection plate in which a plurality of connection members arranged in a mold are integrally molded in a resin by insert molding or the like (for example, Patent Document 1). reference).

Japanese Patent No. 3990960

  When the battery connection plate described in Patent Document 1 is used, only one battery connection plate is attached to a plurality of electrode terminals protruding from a plurality of unit cells, and a plurality of locations between electrode terminals of adjacent unit cells are provided. It is possible to connect all together and improve work efficiency.

  However, since an assembly tolerance is set between a plurality of unit cells arranged, in a battery module in which a plurality of unit cells are arranged, the pitch between electrode terminals formed in adjacent unit cells is shifted. There is a case. Then, when connecting the battery connection plate described above to the electrode terminal, a displacement occurs between the electrode terminal and the connection member disposed on the battery connection plate, so that the efficiency of the battery connection plate connection work is reduced. There is concern.

  This invention is completed based on the above situations, Comprising: It aims at providing the battery wiring module which can adjust easily the shift | offset | difference of the pitch between adjacent electrode terminals.

  In order to solve the above problems, the present invention provides 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 connection members connected to the electrode terminals. And a resin protector made of an insulating resin having a holding portion for holding the connection member, and the connection member is held by the holding portion so as to be movable in the arrangement direction of the unit cells. It is.

  In the present invention, since the holding part of the resin protector holds the connecting member for connecting the electrode terminals so as to be movable in the direction in which the plurality of single cells are arranged, the connecting member is provided when the pitch between the electrode terminals is shifted The pitch shift can be adjusted by moving in the direction in which the cells are arranged. As a result, according to the present invention, it is possible to provide a battery wiring module capable of easily adjusting the shift in pitch between adjacent electrode terminals.

The present invention may have the following configuration.
The resin protector may be provided with an insulating wall that is arranged between the adjacent connecting members and maintains an insulating state of the adjacent connecting members.
With such a configuration, it is possible to maintain the insulation state of adjacent connecting members.

The resin protector may include a plurality of holding units including the holding unit, and the plurality of holding units may be connected to be movable in the arrangement direction of the single cells.
When the unit cell constituting the unit cell group expands and contracts in the arrangement direction of the unit cells, and the pitch deviation between the electrode terminals becomes large, the integrally formed connection plate as described in Patent Document 1 Then, there is a possibility that the pitch deviation cannot be adjusted. Therefore, with the above-described configuration, even if the pitch shift between the electrode terminals becomes large, the pitch shift can be adjusted by moving the holding unit in the arrangement direction of the plurality of single cells.

The holding portion is provided with an attachment protrusion to which the connection member can be attached, while the connection member is provided with an attachment hole having a shape that receives the attachment protrusion and extends in the arrangement direction of the cells. It may be.
With such a configuration, if the attachment holes of the connection member are attached to the attachment protrusions of the holding portion, the connection member can move in the direction in which the cells are arranged. The deviation can be adjusted.

One terminal is connected to the connection member, and includes a flexible printed circuit board on which a voltage detection conductive path that constitutes a voltage detection circuit that detects a voltage of a cell connected to the connection member is formed, and the flexible The printed circuit board may be held by the holding unit so as to be movable in the cell arrangement direction.
With such a configuration, in the battery wiring module including the voltage detection circuit, the flexible printed circuit board on which the voltage detection conductive path is formed is also held by the holding unit so as to be movable in the cell arrangement direction. Also with the printed circuit board, the pitch deviation between the adjacent electrode terminals can be adjusted.

A plurality of voltage detection conductive paths are formed on the flexible printed circuit board, and the connection members are connected to the plurality of voltage detection conductive paths, respectively, between the adjacent connection members of the flexible printed circuit board. A bending portion may be formed in the region disposed on the surface.
With such a configuration, the pitch deviation between the connecting members can be adjusted by extending the flexure of the flexible printed circuit board.

The flexible printed circuit board may be provided with a temperature control conductive path that constitutes a temperature control circuit for controlling the temperature of the unit cell together with the voltage detection conductive path.
With such a configuration, since one flexible printed board can have both the voltage detection function and the temperature control function, the connection work of the members having the voltage detection function and the temperature control function can be simplified. In addition, the number of parts can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the battery wiring module which can adjust easily the shift | offset | difference of the pitch between adjacent electrode terminals can be provided.

The partial perspective view of the battery module which attached the battery wiring module of Embodiment 1 of the state which removed the cover Battery wiring module perspective view The perspective view which shows the resin protector holding the flexible printed circuit board (FPC) and the connection member, and a lid unit The perspective view which shows FPC and the resin protector which were connected with the connection member Perspective view of holding unit before connection Plan view of holding unit (resin protector) after connection The top view of the holding unit (resin protector) after sectional drawing connection in the AA line of FIG. Exploded perspective view showing FPC and connecting member Perspective view partially showing conductive path of FPC The perspective view of the battery wiring module of Embodiment 2. Partial plan view of the battery module with the battery wiring module installed Partial enlarged view of FIG. Perspective view of holding unit Left side view of holding unit Right side view of holding unit The perspective view which shows a mode that a connection member is inserted in a holding | maintenance unit. A perspective view showing a holding unit before connection The perspective view which shows a mode that a voltage detection terminal is inserted in the holding | maintenance unit (resin protector) after connection.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the battery wiring module 20 according to the present embodiment is attached to a unit cell group 10 in which a plurality (14 in the present embodiment) of unit cells 11 having positive and negative electrode terminals 12 are arranged. It is what 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 M1 formed by attaching the battery wiring module 20 of the present embodiment to the unit cell group 10 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 11 constituting the single cell group 10 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 11 by the battery wiring module 20. In the following description, the upper side in FIG.

(Single cell 11)
The unit cell 11 has a flat rectangular parallelepiped shape. As shown in FIG. 1, a positive electrode terminal 12 </ b> A and a negative electrode terminal 12 </ b> B are formed on the upper surface 11 </ b> A of the unit cell 11. The electrode terminal 12 includes a pedestal (not shown) made of a metal plate material, and an electrode post 13B protruding in a round bar shape upward from the pedestal. A thread 14 is formed on the surface of the electrode post 13B. The plurality of single cells 11 are arranged so that the polarities of the electrode terminals 12 of the adjacent single cells 11 are different (so that the positive terminal 12A and the negative terminal 12B are alternately arranged). The electrode post 13B is inserted into a through hole 23 (details will be described later) of the bus bar 21 (an example of a connecting member), and is fixed to the bus bar 21 by screwing of a screw member (not shown). The plurality of unit cells 11 are fixed by a holder (not shown) so as to constitute the unit cell group 10.

(Battery wiring module 20)
The battery wiring module 20 is attached to the approximate center of the upper surface 11 </ b> A (electrode terminal surface) of the unit cell group 10.
As shown in FIGS. 2 to 4, the battery wiring module 20 includes a plurality of bus bars 21 connected to the electrode terminals 12 of the unit cells 11 and a voltage detection unit that detects the voltage of the unit cells 11 connected to the bus bar 21. The resin protector 30 made of a synthetic resin having the FPC 40 in which the conductive path 42 is formed and the holding portion 32 for holding the bus bar 21 and the FPC 40 is provided. A separate lid 16 is attached to the upper surface of the battery wiring module 20 of the present embodiment.

(Lid 16)
The lid 16 is made of an insulating resin material, and includes two lids 16 arranged in the left-right direction as shown in FIGS. 2 and 3. Each lid 16 includes a substantially central flat portion 16A and a mountain-shaped side edge portion 16B connected to a pair of side edges in the longitudinal direction of the flat portion 16A via a hinge 16C. The flat portion 16A is a portion that covers the FPC 40, and the two side edge portions 16B are portions that cover the terminal connection portions 22 (details will be described later) connected to the electrode terminals 12 of the bus bar 21, respectively.

  Fixing holes 17 that can receive the lid fixing protrusions 36 provided on the holding unit 31 are formed along the hinges 16 </ b> C on both side edges in the longitudinal direction of the flat portion 16 </ b> A of the lid 16.

(Resin protector 30)
As shown in FIGS. 4 and 5, the resin protector 30 includes a plurality of (two in this embodiment) holding units 31 connected in the left-right direction. The plurality of holding units 31 are arranged along the arrangement direction of the cells 11 and are connected to each other. In the following description, when the two holding units 31 are described separately, the left holding unit 31 shown in FIG. 5 is the first holding unit 31A, and the right holding unit 31 shown in FIG. 5 is the second holding unit 31B. And

(Holding unit 31)
The holding unit 31 is made of an insulating resin material. The holding unit 31 is arranged substantially in parallel with the arrangement direction of the cells 11 and divides the holding part 32 for each arrangement region of the bus bar 21 and a rectangular parallelepiped holding part 32 that holds the FPC 40 and the bus bar 21 in an overlapped state. And a partition wall 33.

As shown in FIG. 4, it is formed on the upper surface of the holding portion 32 (the surface on which the FPC 40 is placed) along the side edge in the longitudinal direction of the holding portion 32, and is attached with the bus bar 21 and the FPC 40 overlapped. A plurality of possible mounting protrusions 34 are provided.
Further, of the two side edges arranged along the arrangement direction of the cells 11 on the upper surface of the holding portion 32, the insertion piece receiving hole 35 for receiving the insertion piece 46 of the FPC 40 is provided on the front side edge in FIG. Is provided.

  A lid fixing projection 36 for fixing the lid 16 to the resin protector 30 is formed on the side surface of the holding portion 32. The lid fixing projection 36 is received and locked in the fixing hole 17 formed in the lid 16.

  As shown in FIG. 3, the partition wall 33 is provided so as to stand up with respect to the bus bar 21 between the terminal connecting portions 22 of the adjacent bus bars 21 connected to the electrode terminals 12, and between the adjacent bus bars 21. It functions as an insulating wall that keeps the insulation state of.

  Although the details will be described later, the first holding unit 31A can hold three first bus bars 21A, three second bus bars 21B, and one third bus bar 21C. The second holding unit 31B can hold the three first bus bars 21A, the four second bus bars 21B, and the one third bus bar 21C.

(Connection structure of holding unit 31)
Next, a connection structure for connecting the first holding unit 31A and the second holding unit 31B will be described.
On the right side surface of the first holding unit 31 </ b> A shown in FIG. 5, two coupling locking pieces 37 are formed protruding rightward. The connection locking piece 37 is formed with a connection locking claw 37A protruding upward.

  On the left side surface of the second holding unit 31B shown in FIG. 5, two locking piece insertion holes 38 into which the connecting locking pieces 37 of the first holding unit 31A can be inserted are formed. The second holding unit 31B is formed with a locking piece locking hole 39 that communicates with the locking piece insertion hole 38 and locks the connection locking claw 37A. As shown in FIGS. 6 and 7, a clearance S <b> 1 is set in the locking piece locking hole 39 so that the connection locking piece 37 can move in the arrangement direction of the cells 11. Thereby, even if the pitch shift between the electrode terminals 12 and 12 becomes large, the pitch shift can be absorbed by the holding unit 31 moving in the arrangement direction of the cells 11. In FIG. 7, X1 indicates the distance between the connection locking claw 37A and the hole edge 39A on the left side of the locking piece locking hole 39, and X2 indicates the connection locking claw 37A and the locking piece locking hole. 39 shows the distance between the hole edge 39A on the right side of the figure 39, and the connection claw 37A can move in the gap S1 by the sum of X1 and X2.

(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. The surface of the bus bar 21 may be plated with metal such as tin or nickel.

  In the present embodiment, as the bus bar 21, as shown in FIG. Among the bus bars 21 on the near side shown in FIG. 8, the bus bar 21 arranged at the left and right ends in the drawing is the third bus bar 21C, and the six bus bars 21 arranged between the third bus bars 21C are the first bus bar 21A. The seven largest bus bars 21 on the back side shown in FIG. 8 are defined as second bus bars 21B.

The dimensions of the first bus bar 21 </ b> A and the second bus bar in the longitudinal direction (the arrangement direction of the unit cells 11) are set according to the dimension between the electrode terminals 12 and 12 of the adjacent unit cells 11.
Each bus bar 21 has a stepped shape, a substantially rectangular terminal connection portion 22 connected to the electrode terminal 12 of the unit cell 11, a standing wall 24 that rises upward from the terminal connection portion 22, and a standing wall 24. And an FPC connection portion 25 that is placed on the upper surface of the holding unit 31 and connected to the FPC 40.

  A through hole 23 into which the electrode post 13 </ b> B of the electrode terminal 12 of the unit cell 11 is inserted is formed in the terminal connection portion 22 of each bus bar 21. One through hole 23 is formed in the end bus bar 21, and two through holes 23 are formed in each of the first bus bar 21A and the second bus bar 21B.

  Now, the FPC connection portion 25 of each bus bar 21 is provided with a mounting hole 26 that can receive the mounting protrusion 34 formed on the upper surface of the holding portion 32 of the resin protector 30. The attachment hole 26 has an oval shape in which the arrangement direction of the cells 11 is the longitudinal direction. In the present embodiment, the mounting protrusion 34 moves in the elliptical mounting hole 26, so that the pitch deviation between the adjacent electrode terminals 12, 12 due to the manufacturing tolerance or assembly tolerance of the unit cell 11 is reduced. Absorption is possible.

One mounting hole 26 is formed in the third bus bar 21C, and two mounting holes 26 are formed in each of the first bus bar 21A and the second bus bar 21B.
Slits 27 are formed adjacent to the attachment holes 26 at both ends of the FPC connection portion 25 of each bus bar 21. The slit 27 has a function of dispersing stress applied to the mounting hole 26.

(FPC40)
An FPC 40 is placed on the FPC connection portion 25 of the bus bar 21. As shown in FIGS. 4, 8, and 9, the FPC 40 forms a plurality of conductive paths 42 by a printed wiring technique on one or both sides of an insulating base film made of, for example, a polyimide film or a liquid crystal film. The surface of the conductive path 42 is covered with a protective film (for example, a polyimide film). Except for FIG. 9, the illustration of the conductive path 42 is omitted.

  The FPC 40 has a belt shape, and is arranged along the arrangement direction of the cells 11 as shown in FIG. A plurality of electronic components 44 are mounted substantially at the center of the FPC 40. As shown in FIG. 9, the electronic component 44 is connected to the conductive path 42 via a solder pad 43 formed on the FPC 40. In the FPC 40, a voltage detection conductive path 42A constituting a voltage detection circuit and a temperature control conductive path 42B constituting a temperature control circuit are formed. For example, an ECU (not shown) or the like is connected to the end of the voltage detection conductive path 42A and the end of the temperature control conductive path 42B. Here, the battery ECU is equipped with a microcomputer, an element, and the like, and has a function of detecting the voltage, current, temperature, etc. of the unit cell 11 and performing monitoring control of each unit cell 11. It is of a known configuration provided.

  Of the both side edges of the FPC 40 in the longitudinal direction, three strip-shaped insertion pieces 46 are provided on the side edge on the side where the first bus bar 21A is arranged (the front side in FIG. 3). As shown in FIG. 9, a temperature control conductive path 42B is formed in the insertion piece 46, and a thermistor 46A is mounted on the end of the temperature control conductive path 42B via a solder pad 43 (not shown). Yes. As shown in FIG. 8, the insertion piece 46 is formed by cutting out a part of the side edge of the FPC 40 and bending it downward.

  The FPC 40 is formed with a bent portion 47 that can be extended in the arrangement direction (longitudinal direction) of the cells 11. The bending portion 47 is formed in a trapezoidal shape in a side view so as to protrude upward, and the deflection of the pitch between the bus bars 21 can be adjusted by the bending portion 47. Each bending portion 47 is arranged between the adjacent second bus bars 21B.

  Attachment holes 45 that can receive the attachment protrusions 34 of the holding unit 31 are formed at both ends of the FPC 40 in the longitudinal direction. The mounting hole 45 of the FPC 40 has an oval shape in which the arrangement direction of the cells 11 is the longitudinal direction.

  The mounting hole 45 of the FPC 40 is substantially the same shape and size as the mounting hole 26 of the bus bar 21 and is provided so as to overlap the mounting hole 26 of the bus bar 21. The mounting hole 45 of the FPC 40 and the mounting hole 26 of the bus bar 21 overlap each other and receive the mounting protrusion 34 of the resin protector 30.

  In the present embodiment, the mounting protrusion 34 moves in the mounting hole 45 of the FPC 40 and the mounting hole 26 of the bus bar 21, so that the adjacent electrode terminals 12, which are caused by manufacturing tolerances and assembly tolerances of the unit cell 11, It is possible to absorb the pitch deviation between the twelve.

  The area surrounding the mounting hole 45 of the FPC 40 is bonded and electrically connected to the area surrounding the mounting hole 26 of the bus bar 21 via the solder pad 43 as shown in FIG. The solder pad 43 is connected to an end (one end) opposite to the end connected to the ECU of the voltage detection conductive path 42A.

(Assembly method of battery wiring module 20)
Next, a method for assembling the battery wiring module 20 will be described.
First, by cutting out a part of the side edge of the FPC 40 in which the conductive paths 42 such as the voltage detection conductive path 42A and the temperature control conductive path 42B are formed, a shape as shown in FIG. The electronic component 44 and the thermistor 46A are mounted.

  The bus bars 21 are arranged as shown in FIG. 8, and the FPC connection portion 25 of the bus bar 21 is bonded to the FPC 40 to be integrated. When the bus bar 21 and the FPC 40 are bonded, the mounting hole 26 of the bus bar 21 and the mounting hole 45 of the FPC 40 are arranged to overlap each other, and the peripheral edges of the mounting holes 26 and 45 are bonded via the solder pads 43. After the bus bar 21 and the FPC 40 are integrated, or before the integration, the insertion piece 46 is bent downward to form a shape as shown in FIG.

  The first holding unit 31A and the second holding unit 31B are connected and integrated together with or before or after the bonding operation of the bus bar 21 and the FPC 40 (see FIGS. 5 and 6). When the coupling latching piece 37 of the first holding unit 31A is inserted into the latching piece insertion hole 38 of the second holding unit 31B, the coupling latching claw 37A of the coupling latching piece 37 enters the hole wall of the latching piece insertion hole 38. Contact and bend downward and deform. When the whole coupling latching claw 37A is fitted into the latching piece latching hole 39, the coupling latching claw 37A is elastically restored and received in the latching piece latching hole 39, and the first holding unit 31A is second. It is connected to the holding unit 31B.

  Here, since the clearance S1 is set between the engagement piece engagement hole 39 and the connection engagement piece 37, as shown in FIG. 7, the first holding unit 31A becomes the second holding unit 31B. Even in the connected state, the connecting locking piece 37 can move in the locking piece locking hole 39 in the arrangement direction of the cells 11.

  Next, an FPC (also referred to as a bus bar bonding FPC 41) to which the bus bar 21 is bonded is attached on the resin protector 30 obtained by integrating the holding unit 31. Specifically, the mounting hole 26 of the bus bar 21 and the mounting hole 45 of the FPC 40 of the bus bar bonding FPC 41 are inserted into the mounting protrusion 34 of the holding part 32 of the resin protector 30 and the insertion piece receiving hole 35 of the holding part 32 is inserted. Then, the insertion piece 46 of the bus bar bonding FPC 41 is inserted.

  Since the dimension in the longitudinal direction of the bus bar adhesion FPC 41 in a state where the bending part 47 is not formed (as shown in FIG. 4) is set larger than the dimension in the longitudinal direction of the upper surface of the holding part 32 of the resin protector 30, When the bus bar adhesive FPC 41 is attached to the upper surface of the holding portion 32, the attachment protrusion 34 may not be inserted into the attachment hole 26 of the bus bar 21 and the attachment hole 45 of the FPC 40. Therefore, when the bus bar bonding FPC 41 is attached to the upper surface of the holding portion 32, a bent portion 47 is formed in a portion arranged between the second bus bars 21B of the bus bar bonding FPC 41 so that the length of the bus bar bonding FPC 41 in the longitudinal direction is increased. While adjusting, the mounting protrusion 34 is inserted into the mounting hole 26 of the bus bar 21 and the mounting hole 45 of the FPC 40. When the bus bar adhesion FPC 41 is thus attached to the resin protector 30, the battery wiring module 20 of the present embodiment is obtained.

  The battery wiring module 20 obtained as described above is assembled to the unit cell group 10. The unit cell group 10 is prepared by arranging the adjacent electrode terminals 12 of the adjacent unit cells 11 to have different polarities, and the battery wiring module 20 is assembled to the unit cell group 10. Specifically, the electrode terminal 12 (electrode post 13 </ b> B) of the unit cell 11 is inserted into the through hole 23 of each bus bar 21.

The through holes 23 are inserted into the electrode posts 13B so that the terminal connection portions 22 of the bus bars 21 are in contact with the pedestals of the electrode terminals 12, and screw members (not shown) are screwed and fixed to the electrode posts 13B.
At this time, the resin protector 30 is provided with the partition wall 33 that maintains the insulation state of the adjacent bus bars 21, so that no short circuit occurs between the bus bars 21.

  When the above operation is repeated and the screw member is fixed to the electrode post 13B, the unit cell group 10 can be electrically connected. Next, when the lid 16 is attached to the battery wiring module 20, 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 present embodiment, the mounting protrusion 34 provided on the holding portion 32 of the resin protector 30 holds the mounting holes 26 of the bus bar 21 and the mounting holes 45 of the FPC 40 movably in the direction in which the cells 11 are arranged. When the pitch deviation between the electrode terminals 12 and 12 occurs, the pitch deviation can be adjusted by the bus bar 21 moving in the arrangement direction of the cells 11. As a result, according to the present embodiment, it is possible to provide the battery wiring module 20 that can easily adjust the pitch shift between the adjacent electrode terminals 12 and 12.

  In particular, according to the present embodiment, if the mounting hole 26 of the bus bar 21 and the mounting hole 45 of the FPC 40 overlapping therewith are mounted on the mounting projection 34 of the holding section 32, the bus bar 21 can move in the direction in which the cells 11 are arranged. Therefore, the pitch shift between the electrode terminals 12 and 12 can be adjusted with a simple structure.

  Furthermore, according to the present embodiment, the FPC 40 in which the voltage detection conductive path 42A is formed is also held by the holding unit 32 so as to be movable in the arrangement direction of the unit cells 11. 12 and 12 can be adjusted.

  In addition, according to the present embodiment, the resin protector 30 is provided with the partition wall 33 that is disposed between the adjacent bus bars 21 and functions as an insulating wall that maintains the insulating state of the adjacent bus bars 21. The insulation state of the adjacent bus bars 21 can be maintained.

  By the way, when the unit cell 11 constituting the unit cell group 10 expands and contracts in the arrangement direction of the unit cells 11 and the displacement of the pitch between the electrode terminals 12 and 12 becomes large, the integrally molded resin protector 30 There is a possibility that the pitch deviation cannot be adjusted. However, according to the present embodiment, the resin protector 30 includes a plurality of holding units 31 including the holding portions 32, and the plurality of holding units 31 are locked and connected so as to be movable in the arrangement direction of the cells 11. Therefore, even if the pitch deviation between the electrode terminals 12 and 12 increases, the pitch deviation can be adjusted by moving the holding unit 31 in the arrangement direction of the plurality of single cells 11.

  Further, according to the present embodiment, the FPC 40 is formed with a plurality of voltage detection conductive paths 42A, and the bus bars 21 are connected to the plurality of voltage detection conductive paths 42A, respectively. Since the bent portion 47 is formed in the region disposed between the 21, the pitch shift between the bus bars 21 can be adjusted by extending the bent portion 47 of the FPC 40.

  Further, according to the present embodiment, the FPC 40 is provided with the temperature control conductive path 42B that constitutes the temperature control circuit for controlling the temperature of the unit cell 11 together with the voltage detection conductive path 42A. Since the FPC 40 can be provided with both the voltage detection function and the temperature control function, it is possible to simplify the connection work of the members having the voltage detection function and the temperature control function, and to reduce the number of parts.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 11, the battery wiring module 60 according to the present embodiment is attached to a unit cell group 50 in which a plurality of (in this embodiment, 12) unit cells 11 having positive and negative electrode terminals 12 are arranged. It is what The configuration of the single cells 10 constituting the single cell group 50 of the present embodiment is the same as that of the single cells 10 of the first embodiment. Also in this embodiment, the plurality of single cells 10 are connected in series. In the following description, the upper side in FIG.

(Battery wiring module 60)
The battery wiring module 60 of the present embodiment is attached to each of the two rows of electrode terminals 12 on the upper surface 11A (electrode terminal surface) of the unit cell group 50. FIG. Only the battery wiring module 60 attached to the row of electrode terminals 12 is shown.

  As shown in FIG. 11, the battery wiring module 60 includes a plurality of bus bars 61 connected to the electrode terminals 12 of the unit cells 11, a voltage detection terminal 63 connected to the bus bar 61 and detecting the voltage of the unit cells 11, and a bus bar. 61 and a resin protector 70 made of synthetic resin having a holding portion 72 that holds the voltage detection terminal 63.

(Bus bar 61)
The bus bar 61 is formed by pressing a plate material made of metal such as copper, copper alloy, stainless steel, or aluminum into a predetermined shape. The surface of the bus bar 61 may be plated with metal such as tin or nickel. The bus bar 61 has a substantially rectangular shape, and the dimension in the longitudinal direction (left and right direction in FIG. 11) is set according to the dimension between the electrode terminals 12 and 12 of the adjacent unit cells 11. In the present embodiment, the plurality of bus bars 61 have the same shape and size.

  A pair of through holes 62 are formed in the bus bar 61 at a predetermined interval. The electrode posts 13B of the electrode terminals 12 of the unit cells 11 are inserted into the pair of through holes 62, respectively. As shown in FIG. 12, the through-hole 62 in the present embodiment has an oval shape in which the arrangement direction of the cells 11 (the left-right direction in FIG. 12) is the longitudinal direction. 61 is relatively movable. That is, as shown in FIG. 12, the bus bar 61 is held by the holding portion 72 so as to be movable in the direction of increasing or decreasing the size of the gap S2 (the arrangement direction of the cells 11). As a result, the bus bar 61 moves in the holding unit 72 in the direction in which the cells 11 are arranged, so that the pitch deviation between the adjacent electrode terminals 12 and 12 due to the manufacturing tolerance or assembly tolerance of the cells 11 can be adjusted. It has become.

(Voltage detection terminal 63)
The voltage detection terminal 63 superimposed on the bus bar 61 includes a flat plate-like main body portion 63A and a barrel portion 63B that is connected to the main body portion 63A and to which the detection electric wire W is crimped. At the center of the main body 63A, the electrode post 13B of the electrode terminal 12 that is disposed so as to overlap one of the pair of through holes 62 of the bus bar 61 and is inserted into the one through hole 62 of the bus bar 61 is inserted. A possible insertion hole 64 is formed therethrough. The insertion hole 64 is formed to be slightly smaller than the through hole 62 of the bus bar 61.

  A protruding piece 65 projecting outward is formed on the edge of the voltage detection terminal 63 opposite to the edge where the barrel portion 63B is formed. The protruding piece 65 is locked by the terminal locking hole 75 of the holding portion 72, thereby restricting the movement of the voltage detection terminal 63 in the vertical direction.

  The voltage detection terminal 63 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 63 may be plated with a metal such as tin or nickel.

  The detection electric wire W connected to the voltage detection terminal 63 is accommodated in an electric wire accommodation portion 78 of a resin protector 70 described later, and is connected to a battery ECU (not shown). A bundling member 66 for bundling the detection electric wires W is attached to the detection electric wires W so as to be compact.

(Resin protector 70)
As shown in FIGS. 10 and 17, the resin protector 70 includes a plurality of (two in this embodiment) holding units 71 connected in the left-right direction. The two holding units 71 are arranged along the arrangement direction of the unit cells 11 and are connected to each other. Details of the connection structure of the holding unit 71 will be described later.

  The holding unit 71 includes a holding portion 72 that houses and holds the bus bar 61 and the voltage detection terminal 63, a lead-out groove 76 that leads out the detection electric wire W connected to the voltage detection terminal 63, and a voltage detection that is led out from the lead-out groove 76. And an electric wire housing part 78 for housing the detection electric wire W of the terminal 63. These members are integrally formed. Hereinafter, each member will be described.

(Holding part 72)
As shown in FIG. 17, the holding unit 71 is provided with three holding portions 72 that respectively accommodate the three bus bars 61. Each holding part 72 is opened upward and includes an enclosing wall 73 that surrounds the periphery of the bus bar 61 and a bottom wall 73E on which the bus bar 61 is placed, as shown in FIG.

  As shown in FIG. 16, the bottom wall 73 </ b> E is provided partially at a substantially central portion of the holding portion 72 and an end portion along the surrounding wall 73, and the bus bar 61 and the electrode are placed on the bus bar 61. It is provided so as not to hinder the electrical connection with the terminal 12.

  Although not shown in detail, the height of the surrounding wall 73 is set higher than the upper end of the electrode terminal 12 when the battery wiring module 60 is connected to the unit cell group 50. 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 surrounding wall 73 is formed so as to surround substantially the entire area of the peripheral edge of the bus bar 61. Specifically, the surrounding wall 73 includes a rear wall 73A disposed on the back side in FIG. 16, a front wall 73B disposed on the near side in FIG. 16, and a pair of side edges in the short side direction of the bus bar 61. The left and right side walls 73C and 73D (the left side wall 73C and the right side wall 73D) are arranged. An opening 73F is provided in the front wall 73B so as to penetrate the lead-out groove 76.

  A gap S <b> 2 is set between the left and right side walls 73 </ b> C and 73 </ b> D of the surrounding wall 73 and the bus bar 61 so that the pitch deviation between the electrode terminals 12 and 12 can be adjusted. Among the surrounding walls 73, the left and right side walls 73C and 73D are disposed between the adjacent bus bars 61 and function as insulating walls that maintain an insulating state.

  As shown in FIG. 16, a bus bar locking piece 74 that restricts the upward movement of the inserted bus bar 61 and prevents it from coming off is formed at substantially the center of the front wall 73B and the rear wall 73A. . When the bus bar 61 is inserted, the bus bar locking piece 74 is elastically deformed in the outward direction of the surrounding wall 73. When the bus bar 61 is placed on the bottom wall 73E, the bus bar locking piece 74 is elastically restored and the bus bar 61 moves upward. It comes to regulate.

  A terminal locking hole 75 for receiving and locking the protruding piece 65 of the voltage detection terminal 63 is formed in a region closer to the left side in FIG. 16 than the center of the rear wall 73A.

(Leading groove 76)
The lead-out groove 76 is a member in which the barrel portion 63B of the voltage detection terminal 63 led out from the holding portion 72 and the detection electric wire W crimped to the barrel portion 63B are arranged, and the holding portion 72 and the electric wire accommodating portion 78 are connected to each other. It is a groove-shaped member that communicates. The lead-out groove 76 has a concave shape and is provided in a direction substantially perpendicular to the arrangement direction of the cells 11. Specifically, the lead-out groove 76 passes through the opening portion 73F of the front wall 73B of the holding portion 72 and communicates with the holding portion 72, and the opening portion 79C of the rear groove wall portion 79A (details will be described later) of the electric wire housing portion 78. And communicates with the electric wire housing portion 78.

(Electric wire housing part 78)
The electric wire housing portion 78 is configured to have a concave cross section by a pair of groove wall portions 79 extending in the arrangement direction of the cells 11 and a bottom wall portion 79D connecting the pair of groove wall portions 79. By connecting the two holding units 71 to each other, the electric wire accommodating portion 78 is connected, and one groove (electric wire accommodating groove 78) communicating in the arrangement direction of the cells 11 is formed.

  Each detection electric wire W led out from the lead-out groove 76 of each holding unit 71 is bent at a substantially right angle and is accommodated along the extending direction of the electric wire accommodation portion 78. The plurality of detection wires W housed in the wire housing portion 78 are led out to the battery ECU side.

  Of the pair of groove walls 79, the groove wall 79 on the lead-out groove 76 side is a rear groove wall 79A, and the other groove wall 79 is a front groove wall 79B. The rear groove wall 79A is provided with an opening 79C that divides the rear groove wall 79A into two, and a lead-out groove 76 passes through the opening 79C.

  At the upper end portions of the pair of groove wall portions 79, electric wire holding pieces 80 are formed to project inward at opposite positions. The pair of electric wire holding pieces 80 prevents the detection electric wire W from being detached from the electric wire housing portion 78.

(Connection structure of holding unit 71)
Next, a connection structure for connecting adjacent holding units 71 will be described. At a position adjacent to the lead-out groove 76 at the left end in FIG. 13 of the holding unit 71, as shown in FIGS. 13 and 14, a connecting protrusion 81 that connects adjacent holding units 71 is provided on the holding unit 72. It is provided so as to protrude outward from the side wall and the end of the electric wire accommodating portion 78. At the right end of the holding unit 71 in FIG. 13, as shown in FIGS. 13 and 15, a connection receiving portion 82 that receives and connects the connection protrusions 81 of the adjacent holding units 71 is connected to the crude steel wall of the holding portion 72. It is provided so as to protrude outward from the end portion of the electric wire housing portion 78.

  A connection locking claw 81 </ b> A is provided at the tip of the connection protrusion 81. The holding unit 71 is connected by the connection locking claw 81A being locked to the end of the connection receiving portion 82 on the lead-out groove 76 side (the left end in FIG. 12).

  A pair of elastic pieces 82 </ b> A are formed in the connection receiving portion 82. The pair of elastic pieces 82A is expanded and deformed outward by the insertion of the coupling latching claw 81A. When the coupling latching claw 81A finishes passing through the coupling receiving portion 82, the pair of elastic pieces 82A is elastically restored and latches the coupling projection 81. It is like that.

  The length dimension of the connection protrusion 81 is set longer than the length dimension of the connection receiving portion 82. Therefore, in the state where the two holding units 71 are connected as shown in FIG. 12, the connection locking claw 81A is movable in the arrangement direction of the cells 11 by the length indicated by X3 in FIG. . Here, X3 is the distance from the end surface on the connection receiving portion 82 side of the connection locking claw 81A to the end portion on the lead-out groove 76 side of the connection receiving portion 82 when the two holding units 71 are connected. It is.

(Assembly method of battery wiring module 60)
Next, a method for assembling the battery wiring module 60 will be described. First, the bus bar 61 is attached in each holding part 72 of each holding unit 71. When the bus bar 61 is inserted into the holding portion 72 from above the holding portion 72, the bus bar 61 comes into contact with the bus bar locking pieces 74 formed on the rear wall 73 </ b> A and the front wall 73 </ b> B of the holding portion 72. Is bent and deformed in the outer direction of the surrounding wall 73.

  When the bus bar 61 is further inserted downward and the bus bar 61 reaches the bottom wall 73E of the holding portion 72, the bus bar locking piece 74 is elastically restored and disposed on the bus bar 61. As a result, the upward movement of the bus bar 61 is restricted and prevented from coming off.

  Next, the two holding units 71 to which the bus bar 61 is attached are connected. As shown in FIG. 17, the connecting projection 81 of the holding unit 71 arranged on the right side is inserted between the pair of elastic pieces 82A of the connecting receiving part 82 of the holding unit 71 arranged on the left side. Then, the connection locking claw 81A is inserted into the connection receiving portion 82 while expanding and deforming the pair of elastic pieces 82A outward. When the coupling latching claw 81A finishes passing through the coupling receiving portion 82, the pair of elastic pieces 82A is elastically restored, the coupling latching claw 81A is prevented from coming off by the coupling receiving portion 82, and the two holding units 71 are coupled. (See FIG. 18). At this time, at the connecting portion of the two holding units 71, the connecting protrusion 81 is movable in the left-right direction in FIG.

  Next, the voltage detection terminal 63 is fitted from above the holding portion 72 onto the bus bar 61 accommodated in the holding portion 72, and the detection electric wire W crimped to the voltage detection terminal 63 from the lead-out groove 76 is accommodated in the electric wire. The voltage detection terminal 63 is attached by being housed in the portion 78 (the wire housing groove 78).

  As shown in FIG. 18, the voltage detection terminal 63 is attached to the holding portion 72 in a state where the detection electric wires W connected to the voltage detection terminal 63 are combined into one by a binding member 66. When attaching the voltage detection terminal 63, first, the protruding piece 65 of the voltage detection terminal 63 is inserted into the terminal locking hole 75, and the protruding piece 65 of the voltage detection terminal 63 is moved vertically by the terminal locking hole 75. The movement in the direction is restricted and positioned.

  Further, the edge of the barrel portion 63B of the voltage detection terminal 63 is pushed into the holding portion 72 from above to fit the barrel portion 63B and the detection electric wire W into the lead-out groove 76, and the detection electric wire W is accommodated in the electric wire accommodation portion 78. To do.

  When the pair of electric wire holding pieces 80 formed in the electric wire housing portion 78 and the detection electric wires W come into contact with each other, the electric wire holding pieces 80 are elastically deformed downward. When the detection electric wire W is pushed into the electric wire housing portion 78 and the detection electric wire W is arranged below the electric wire holding piece 80, the electric wire holding piece 80 is elastically restored and the detection electric wire W accommodated in the electric wire accommodation portion 78 is recovered. Is held so as not to jump out from above. In this way, the battery wiring module 60 is obtained.

  Next, the battery wiring module 60 is assembled to the unit cell group 50. The unit cell group 50 is prepared by arranging the adjacent electrode terminals 12 of the adjacent unit cells 11 to have different polarities, and the battery wiring module 60 is assembled to the unit cell group 50. Specifically, the electrode terminal 12 (electrode post 13 </ b> B) of the unit cell 11 is inserted through the through hole 62 of each bus bar 61 and the insertion hole 64 of the voltage detection terminal 63 overlapping with the through hole 62.

  The through hole 62 or the through hole 62 and the insertion hole 64 are inserted into the electrode post 13B so that the bus bar 61 is brought into contact with the pedestal (not shown) of the electrode terminal 12, and a screw (not shown) is attached to each electrode post 13B. The member is screwed and fixed. When the above operation is repeated and the screw member is fixed to the electrode post 13B, the unit cell group 50 can be electrically connected, and the battery module M2 is completed.

(Operation and effect of this embodiment)
Hereinafter, the operation and effect of the present embodiment will be described. In the present embodiment, the bus bar 61 is held by the holding portion 72 of the resin protector 70 so as to be movable in the arrangement direction of the plurality of single cells 11, so that when a pitch shift occurs between the electrode terminals 12, 12, The shift of the pitch can be adjusted by moving the bus bar 61 in the direction in which the cells 11 are arranged. As a result, according to the present embodiment, it is possible to provide the battery wiring module 60 capable of easily adjusting the pitch shift between the adjacent electrode terminals 12 and 12.

  Further, according to the present embodiment, the holding portion 72 of the resin protector 70 is arranged between the adjacent bus bars 61, and the left and right side walls 73C functioning as insulating walls that hold the insulating state of the adjacent bus bars 61. Since 73D is provided, the insulation state of the adjacent bus bar 61 can be maintained.

By the way, when the unit cell 11 constituting the unit cell group 50 expands and contracts in the arrangement direction of the unit cells 11 and the pitch shift between the electrode terminals 12 and 12 becomes large, the integrally molded resin protector 70 There is a possibility that the pitch deviation cannot be adjusted.
However, according to the present embodiment, the resin protector 70 includes a plurality of holding units 71 each including a holding portion 72, and the plurality of holding units 71 are connected to be movable in the direction in which the cells 11 are arranged. Even if the pitch deviation between the electrode terminals 12 and 12 increases, the pitch deviation can be adjusted by the holding unit 71 moving in the arrangement direction of the cells 11.

<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 holding portion 32 provided with the insulating wall 33 provided between the adjacent bus bars 21 and holding the insulating state of the adjacent bus bars 21 is shown. A member may be arranged to insulate the bus bars.
(2) In the above-described embodiment, the resin protectors 20 and 70 are shown in which the plurality of holding units 31 and 71 are connected so as to be movable in the arrangement direction of the single cells 11, but even if they are integral resin protectors. Good.
(3) In the first embodiment, the mounting protrusion 34 to which the bus bar 21 can be attached is provided on the holding portion 32, while the bus bar 21 and the FPC 40 are provided with oval attachment holes 26 and 45, respectively. However, the mounting protrusion may be provided on the bus bar and the FPC by providing an attachment hole in the holding portion.
(4) In the first embodiment, the FPC 40 in which the bending portion 47 is formed in the region arranged between the bus bars 21 is shown. However, the FPC 40 in which the bending portion is not formed may be provided.
(5) In the first embodiment, the FPC 40 in which the temperature control conductive path 42B is formed together with the voltage detection conductive path 42A is shown, but an FFC in which only one of them is formed may be used.
(6) In the first embodiment, the example in which the FPC 40 and the bus bar 21 are bonded via the solder pads 43 is shown. However, the FPC and the bus bar may be bonded with a conductive adhesive.

M1, M2 ... battery module 10, 50 ... single cell group 11 ... single cell 12 ... electrode terminal 12A ... positive electrode terminal 12B ... negative electrode terminal 20, 60 ... battery wiring module 21, 61 ... bus bar (connection member)
21A ... 1st bus bar 21B ... 2nd bus bar 21C ... 3rd bus bar 23, 62 ... Through-hole 26 ... (Bus bar) mounting hole 30, 70 ... Resin protector 31 ... Holding unit 31A ... 1st holding unit 31B ... 2nd holding Unit 32, 72 ... Holding part 33 ... Partition wall (insulating wall)
34 ... Mounting projection 37 ... Connection locking piece 37A ... Connection locking claw 38 ... Locking piece insertion hole 39 ... Locking piece locking hole 39A ... Hole edge S1, S2 ... Clearance 40 ... FPC
42 ... Conductive path 42A ... Voltage detection conductive path 42B ... Temperature control conductive path 43 ... Solder pad 45 ... (FPC) mounting hole 46 ... Insertion piece 46A ... Thermistor 46 ... Deflection part 73 ... Surrounding wall 73C ... Left wall ( Insulation wall)
73D ... Right side wall (insulating wall)
81 ... Connection projection 81A ... Connection locking claw 82 ... Connection receiving portion 82A ... Elastic piece

Claims (7)

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 connection members connected to the electrode terminal, and a resin protector made of an insulating resin having a holding portion for holding the connection member,
The connection member is a battery wiring module which is held by the holding portion so as to be movable in the cell arrangement direction. 2. The battery wiring module according to claim 1, wherein the resin protector is provided with an insulating wall that is disposed between the adjacent connecting members and maintains an insulating state of the adjacent connecting members. . The said resin protector is provided with two or more holding units provided with the said holding | maintenance part, and the said some holding | maintenance unit is connected so that the movement to the arrangement direction of the said cell is possible. The battery wiring module described in 1. The holding portion is provided with an attachment protrusion to which the connection member can be attached, while the connection member is provided with an attachment hole having a shape that receives the attachment protrusion and extends in the arrangement direction of the cells. The battery wiring module according to any one of claims 1 to 3, wherein the battery wiring module is provided. One terminal is connected to the connection member, and includes a flexible printed circuit board on which a voltage detection conductive path that constitutes a voltage detection circuit that detects a voltage of a cell connected to the connection member is formed,
5. The battery wiring module according to claim 1, wherein the flexible printed circuit board is held by the holding portion so as to be movable in an arrangement direction of the single cells. 6. A plurality of voltage detection conductive paths are formed on the flexible printed circuit board, and the connection members are connected to the plurality of voltage detection conductive paths,
The battery wiring module according to claim 5, wherein a flexible portion is formed in a region of the flexible printed board disposed between the adjacent connection members. 6. The flexible printed circuit board is formed with a temperature control conductive path that constitutes a temperature control circuit for controlling the temperature of the unit cell together with the voltage detection conductive path. Item 7. The battery wiring module according to Item 6.

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