JP2013171617A - Battery wiring module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery wiring module capable of detecting voltage of a single battery in a battery module having a lamination type single battery group.SOLUTION: A battery wiring module 20 attached to a single battery group 10 obtained by connecting in series a plurality of single batteries 11 each having positive and negative electrode terminal surfaces 13 on both sides by laminating them so that the electrode terminal surfaces 13 of the adjacent single batteries 11 are arranged at positions opposed to each other, has a resin protector 21. The resin protector 21 is disposed between the electrode terminal surfaces 13 of the adjacent single batteries 11 to electrically connect between the electrode terminal surfaces 13 of the adjacent single batteries 11, and is provided with a connector housing part 22 that can accommodate a connector 30 having a voltage detection terminal 36 connected to an external terminal part 18, of a conductive plate material 15 having the external terminal part 18 led from between the electrode terminal surfaces 13 to the exterior.

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. Here, when a plurality of unit cells are connected in series or in parallel, there is a problem that if the battery characteristics such as the battery voltage are not uniform among the unit cells, the cells are deteriorated or damaged.

  Therefore, in the battery module as described above, charging and discharging are stopped before abnormality occurs in the voltage between the single cells. Therefore, each connection member has a voltage detection terminal for detecting the voltage of the single cell. It is connected. The voltage detection terminal is connected to, for example, an ECU via a voltage detection line, and the ECU detects the voltage of each unit cell and stops charging and discharging before an overdischarge or overcharge state is reached.

  As a structure for connecting the voltage detection terminal as described above to a unit cell group formed by arranging a plurality of unit cells, for example, the one described in Patent Document 1 is known.

  In this battery module, a structure is adopted in which a voltage detection terminal in which the exposed conductor of the terminal of the voltage detection line is connected by crimping is inserted into the electrode terminal of the unit cell, and the electrode terminal is tightened together with a connection member with a nut. (See FIG. 1 of Patent Document 1).

JP 2011-124176 A

  By the way, in recent years, from the viewpoint of miniaturization of the battery module, a plurality of unit cells having positive and negative electrode terminal surfaces on the front and back sides are arranged in a position where the electrode terminal surfaces of adjacent unit cells face each other. Thus, the use of a stacked unit cell group in which unit cells are connected in series has been studied.

  When the unit cell having such a configuration is used, it is not necessary to provide a protruding electrode terminal at the upper end of the unit cell, and a connection member such as a bus bar is not required. Therefore, a battery smaller than a conventional battery module is required. Modules can be provided.

  However, in the unit cell group composed of a plurality of unit cells having electrode terminal surfaces on the front and back surfaces, the electrode terminal surfaces are electrically connected by bringing the electrode terminal surfaces of adjacent unit cells into contact with each other. Not arranged outside. Therefore, the connection structure of the member for detecting the voltage of the unit cell has been difficult.

  The present invention has been completed based on the above circumstances, and provides a battery wiring module capable of detecting the voltage of a single battery in a battery module including a stack type single battery group. Objective.

  In order to solve the above-mentioned problems, the present invention provides a plurality of unit cells each having a positive electrode electrode surface and a negative electrode terminal surface on the front and back surfaces, and the electrode terminal surfaces of the adjacent unit cells are arranged at positions facing each other. A battery wiring module that is attached to a group of unit cells connected in series, and is arranged between the electrode terminal surfaces of the adjacent unit cells to electrically connect the electrode terminal surfaces of the adjacent unit cells. And a connector housing portion capable of housing a connector having a voltage detection terminal connected to the external terminal portion of a conductive plate member having an external terminal portion led out from between the electrode terminal surfaces to the outside. It is a wiring module for batteries provided with the provided resin protector.

In the present invention, the stacked unit cell group can be electrically connected by arranging a conductive plate member having an external terminal portion between the electrode terminal surfaces. And if the external terminal part of an electroconductive board | plate material is connected with the voltage detection terminal of the connector accommodated in the connector accommodating part of a resin protector, the voltage detection circuit of a cell will be comprised.
In other words, in the present invention, a member (conductive plate member) that electrically connects the stacked unit cell group can have a function as a member that connects to the voltage detection circuit.
Therefore, according to the present invention, it is possible to provide a battery wiring module capable of detecting the voltage of a single battery in a battery module including a stacked single battery group.

The present invention may be configured as follows.
A protrusion projecting in the stacking direction of the unit cell group may be formed on at least one surface of the conductive plate member.
Since the electrode terminal surface of the unit cell is made of metal, a metal oxide film is formed on the surface. When the electrode terminal surfaces in a state where such an oxide film is formed are brought into contact with each other, the contact resistance is reduced. May be larger. In particular, when the electrode terminal surface of the unit cell is an aluminum terminal surface, a very hard aluminum oxide film is easily formed, and there is a concern that the contact resistance will increase.

  Therefore, with the configuration as described above, the projecting portion protruding in the stacking direction of the unit cells formed on the conductive plate disposed between the adjacent unit cells contacts the electrode terminal surface, so that the electrode of the unit cell The oxide film formed on the surface of the terminal surface is broken and the new metal surface is exposed. The exposed new metal surface and the electrode terminal surface of the adjacent unit cell are connected via a conductive plate material. Therefore, according to the above configuration, the new surface exposed by the contact of the protrusion on the electrode terminal surface of the unit cell and the electrode terminal surface of the adjacent unit cell are electrically connected via the conductive plate material. The contact resistance between single cells can be reduced.

The electrode terminal surface may be an aluminum electrode terminal surface.
In a unit cell provided with an aluminum electrode terminal surface, a particularly hard aluminum oxide film is easily formed, so that the contact resistance is increased. Therefore, with the above configuration, the protrusion can break the aluminum oxide film and expose the new metal surface, so that the contact resistance can be reduced when the unit cells are connected to form the unit cell group. Can do.

The conductive plate material may be made of copper or copper alloy.
With such a configuration, the conductive plate can be made excellent in strength and conductivity.

A plating layer may be formed on the surface of the conductive plate.
When the metal material constituting the electrode terminal surface and the metal material constituting the conductive plate material are different metals (for example, when the electrode terminal surface is an aluminum electrode terminal surface and the conductive plate material is made of copper or copper alloy) There is a concern about the occurrence of electrolytic corrosion at the contact portion of different metals.
Therefore, with the above configuration, it is possible to delay or suppress the occurrence of electrolytic corrosion by the plating layer formed on the surface of the metal material that constitutes the conductive plate.

The resin protector may be provided with a terminal holding part that holds the external terminal part of the conductive plate member.
With such a configuration, by attaching the resin protector holding the external terminal part of the conductive plate material to the single cell group, the conductive plate material can be arranged between the electrode terminal surfaces of the single cell, so that the assembly work Improved workability.

The resin protector is provided with a plurality of the connector accommodating portions and a displacement allowing portion that allows the region to be displaced in the stacking direction of the unit cells for each region where the connector accommodating portions are provided. It may be done.
Even in a unit cell having electrode terminal surfaces on the front and back sides, a pitch shift between the electrode terminals may occur due to manufacturing tolerance between the electrode terminals of the unit cell or expansion / contraction of the unit cell. However, with the configuration as described above, when a pitch deviation occurs between the electrode terminals, the region where the connector housing portion is provided is displaced in the stacking direction of the unit cells, and the pitch deviation is absorbed.

The said resin protector is good also as a structure which consists of several units which have one said connector accommodating part.
In the case of producing a resin protector corresponding to the number of connector housings, the number of connector housings varies depending on the number of connected single cells, and therefore a mold that matches the configuration of the single cell group is required. However, with the above-described configuration, it is sufficient to prepare a unit of one shape and prepare the unit according to the number of connectors that connect the unit cell group. The manufacturing cost can be reduced.

The unit cell may be provided with a locking portion for locking the resin protector.
With such a configuration, since the resin protector can be locked by the locking portion of the single cell, workability when housing the connector in the connector housing portion of the resin protector is improved.

  ADVANTAGE OF THE INVENTION According to this invention, in a battery module provided with a laminated | stacked cell group, the battery wiring module which can perform the voltage detection of a cell can be provided.

The perspective view of the battery module to which the wiring module for batteries of Embodiment 1 was attached. Plan view of battery module Perspective view of cell group Single cell perspective view Single cell side view Perspective view of resin protector Front view of conductive plate The perspective view explaining the attachment procedure of the wiring module for batteries to the single cell group The perspective view explaining the procedure which connects a connector to the wiring module for batteries Sectional drawing in the AA line of FIG. Partial enlarged view of FIG. Sectional drawing in the BB line of FIG. The perspective view of the battery module to which the wiring module for batteries of Embodiment 2 was attached. Plan view of battery module Single cell perspective view Single cell side view The perspective view which shows a mode that an electroconductive board | plate material is attached to a resin protector. The perspective view which shows a mode that the resin protector which attached the electroconductive board | plate material is attached to a cell. The perspective view which shows a mode that the resin protector was latched to the cell. The perspective view which shows a mode that the cell which attached the resin protector is laminated | stacked The perspective view explaining the procedure which connects a connector to the wiring module for batteries Sectional drawing in the CC line of FIG. Partial enlarged view of FIG. Sectional drawing in the DD line of FIG.

<Embodiment 1>
The battery wiring module 20 of Embodiment 1 will be described with reference to FIGS.
The battery module M1 to which the battery wiring module 20 of the present embodiment is attached is used as a power source for driving a vehicle such as an electric vehicle or a hybrid vehicle. As shown in FIGS. 1 and 2, the battery module M <b> 1 includes a unit cell group 10 in which a plurality (16 in this embodiment) of unit cells 11 are arranged side by side, and a battery wiring attached to the unit cell group 10. The module 20 is provided. In the following description, the up and down direction is based on the up and down direction in FIG. 11, and in the front and back direction, the left side in FIG. 2 is the front and the right side is the back.

(Single cell group 10)
As shown in FIG. 3, for example, an electrode plate 14 whose front or rear surface is covered with an insulating resin is attached to both ends of the unit cell group 10 in the front-rear direction. It is designed not to be exposed. A fixing means such as a holding plate (not shown) is attached to the unit cell group 10, and thereby the electrical connection state between the positive terminal 12 </ b> A and the negative terminal 12 </ b> B of the adjacent unit cell 11 is maintained.

  In the present embodiment, the unit cell group 10 includes a plurality of unit cells 11 arranged at positions where the electrode terminal surfaces 13A, 13B of the adjacent unit cells 11 are opposed to each other, and the electrode terminal surfaces 13A, 13B at the opposed positions. A conductive plate 15 (described later) is sandwiched between the layers.

(Single cell 11)
As shown in FIGS. 4 and 5, the unit cells 11 constituting the unit cell group 10 have a flat, substantially rectangular parallelepiped shape, and a power generation element (not shown) is accommodated therein. A pair of electrode terminals 12 connected to the power generation element so as to be conductive are provided on the front and rear sides (both sides) of the unit cell 11.

  The pair of electrode terminals 12 is made of metal and has electrode terminal surfaces 13A and 13B. Of the pair of electrode terminals 12, one electrode terminal 12 is a positive electrode terminal 12A, and the other electrode terminal 12 is a negative electrode terminal 12B. The polarities of the electrode terminals 12 arranged at the contact positions in the adjacent unit cells 11 are different.

  As shown in FIG. 5, each of the pair of electrode terminals 12 has a portion projecting outward, and the wall surfaces of the projecting portions are electrode terminal surfaces 13A and 13B. In the present embodiment, an example of a lithium ion battery in which the positive electrode terminal surface 13A is an aluminum electrode terminal surface and the negative electrode terminal surface 13B is a copper electrode terminal surface will be described.

  The electrode terminal surface 13A of the positive electrode terminal 12A is electrically connected to the electrode terminal surface 13B of the negative electrode terminal 12B of the adjacent unit cell 11, and the electrode terminal surface 13B of the negative electrode terminal 12B is connected to the positive electrode terminal 12A of the adjacent unit cell 11. It is electrically connected to the electrode terminal surface 13A.

(Conductive plate 15)
The conductive plate 15 is sandwiched between the electrode terminal surfaces 13A and 13B of the adjacent unit cells 11, and the front and back surfaces of the conductive plate 15 are in contact with the electrode terminal surfaces 13A and 13B, respectively.
As shown in FIG. 7, the conductive plate member 15 is disposed so as to be in contact with the approximate center of the electrode terminal surfaces 13A and 13B. The conductive plate 15 is a plate made of copper or copper alloy and has a substantially rectangular shape as shown in FIG. 7, and a tin plating layer (not shown) is formed on the front and back surfaces thereof. The tin plating layer suppresses the occurrence and progression of electrolytic corrosion at the contact portion between the electrode terminal surface 13A, which is an aluminum electrode terminal surface, and the conductive plate 15 made of copper (alloy).

  On the surface (front surface) of the conductive plate 15 on the side shown in FIG. 7, convex and concave portions having a substantially lattice shape as a whole are formed. A portion that forms a square shape on the surface of the conductive plate 15 is a protrusion 16 that protrudes in the stacking direction of the cells 11 when arranged between the cells 11, and the periphery of the protrusion 16 is recessed from the protrusion 16. It is partitioned by the groove 17.

  The protrusions 16 of the conductive plate 15 are in contact with the electrode terminal surface 13A of the unit cell 11 to break the metal oxide film (in this embodiment, the aluminum oxide film) formed on the surface of the electrode terminal surface 13A. It has a function of exposing a new surface.

  The conductive plate 15 has a tab-like external terminal portion 18 at the upper end. The external terminal portion 18 is a portion led out to the outside when the conductive plate member 15 is disposed between the electrode terminal surfaces 13A and 13B. As shown in FIGS. 11 and 12, the external terminal portion 18 passes through the bottom wall of the connector housing portion 22 and is disposed in the connector housing portion 22.

(Battery wiring module 20)
As shown in FIGS. 1 and 2, the battery wiring module 20 includes a synthetic resin-made resin protector 21 having a connector housing portion 22 capable of housing the connector 30.

(Resin protector 21)
As shown in FIG. 1 and FIG. 2, the resin protector 21 is provided with a plurality of connector housing portions 22, and the region 22 </ b> A is provided for each region 22 </ b> A in which the connector housing portion 22 is provided. Displacement permitting portions 24 that allow displacement in the stacking direction (the left-right direction in FIG. 2) are provided. As shown in FIG. 2, the displacement allowing portion 24 is provided so as to connect adjacent connector accommodating portions 22 in a U shape when viewed from above.

  The plurality of connector housing portions 22 of the resin protector 21 are arranged side by side in the stacking direction of the unit cells 11. Each connector housing portion 22 is opened to accept the connector 30 from above, and the bottom wall (lower wall portion) of the connector housing portion 22 is a terminal on which the external terminal portion 18 of the conductive plate 15 is held. It functions as the holding unit 23 (see FIGS. 6 and 8).

(Connector 30)
A single-pole connector 30 is accommodated in each of the plurality of connector accommodating portions 22 of the resin protector 21. The connector 30 is a female connector 30 that can be fitted to the external terminal portion 18, and includes a female terminal fitting 36 and a synthetic resin housing 31 in which a cavity 32 that accommodates the female terminal fitting 36 is formed.

  As shown in FIGS. 10 and 11, a terminal insertion port 33 into which the external terminal portion 18 of the conductive plate 15 is inserted is formed in the lower wall of the cavity 32. A lance 34 that extends downward in a cantilevered manner is formed on the inner wall of the cavity 32 so that it can be bent. The lance 34 can be elastically deformed in the left-right direction with a base end portion located substantially at the center in the vertical direction of the cavity 32 as a fulcrum, and a locking receiving portion 37C (described later) of the female terminal fitting 36 is provided at the distal end portion thereof. An engaging projection 35 that can be engaged is provided.

  The female terminal fitting 36 is formed by punching a conductive metal plate into a predetermined shape and then bending it, and has an elongated shape in the front-rear direction. Although not shown in detail, the female terminal fitting 36 includes a cylindrical main body portion 37 for realizing contact with the external terminal portion 18 as a counterpart, and is provided at the rear (upper side in the drawing) of the main body portion 37. The barrel 38 is fixed to the end of the electric wire 38 by caulking. As shown in FIG. 11, the main body portion 37 is formed with an elastic contact piece 37 </ b> A that elastically contacts the external terminal portion 18. A window hole 37B that allows the lance 34 to enter is opened on a surface of the main body portion 37 opposite to the surface on which the elastic contact piece 37A is formed, and an edge of the window hole 37B is an engagement receiving portion 37C. It has become. The female terminal fitting 36 is pushed from above into the cavity 32 while bending and deforming the lance 34. When the female terminal fitting 36 is properly inserted, the lance 34 is restored and its locking projection 35 enters the window hole 37B and is locked. It is elastically locked to the receiving portion 37C.

  The electric wires 38 that are crimped to the barrels 38 of the female terminal fittings 36 accommodated in the cavities 32 of the connectors 30 are led out upward and gathered together, and are connected to, for example, an ECU (Fig. (Not shown), and the ECU detects the voltage of each unit cell 11 and stops charging and discharging before the battery is overdischarged or overcharged. In the present invention, the female terminal fitting 36 functions as a voltage detection terminal 36 that detects the voltage of each unit cell 11.

(Assembly method of battery module M1)
Next, an assembling method of the battery module M1 to which the battery wiring module 20 of the present embodiment is attached will be described.
A plurality (16 pieces) of the unit cells 11 are stacked by disposing the electrode terminal surfaces 13A of the positive electrode terminals 12A and the electrode terminal surfaces 13B of the negative electrode terminals 12B of the adjacent unit cells 11 to face each other. The electrode plates 14 are arranged at the left and right ends in FIG. 3 of the 16 stacked unit cells 11 so that the electrode terminal surfaces 13A and 13B of the unit cells 11 arranged on the outermost side are not exposed. A cell group 10 as shown is produced.

  At the same time as or before and after the production of the unit cell group 10, the external terminal portion 18 of the conductive plate 15 shown in FIG. 7 is attached to the bottom wall (terminal holding portion 23) of the connector housing portion 22 of the resin protector 21 shown in FIG. The battery wiring module 20 shown in FIG. 8 is manufactured by being inserted and held.

  Next, the battery wiring module 20 is attached to the unit cell group 10. Specifically, each conductive plate 15 attached to the battery wiring module 20 is arranged so that the surface (surface) on the side where the protrusions 16 are formed contacts the electrode terminal surface 13A of the positive electrode terminal 12A. Then, it is inserted between the electrode terminal surfaces 13A and 13B at the opposing positions.

  When the battery wiring module 20 is attached, a pitch shift due to manufacturing tolerance between the electrode terminals 12 of the unit cell 11 may occur, but the resin protector 21 has a region 22A in which the connector housing portion 22 is provided. The displacement of the pitch is absorbed by the displacement allowing portion 24 that allows the single cells 11 to be displaced in the stacking direction, so that the mounting operation can proceed smoothly.

  Next, each unit cell 11 is moved in the direction of narrowing the interval between the adjacent unit cells 11, and a fixing means such as a holding plate (not shown) is attached and pressurized.

  By applying pressure to the unit cell group 10 in a state where the conductive plate member 15 is sandwiched, the protrusion 16 protruding in the stacking direction of the unit cells 11 formed on the conductive plate member 15 is the positive electrode of the adjacent unit cell 11. It contacts with electrode terminal surface 13A, the aluminum oxide film formed on the surface is broken, and the new metal surface is exposed. The surface (front surface) of the conductive plate 15 on which the protrusions 16 are formed is in contact with the new surface exposed on the electrode terminal surface 13A of the positive electrode, and the back surface of the conductive plate 15 is the negative electrode terminal surface 13B of the adjacent unit cell 11. Contact with. Thereby, the positive electrode terminal 12A and the negative electrode terminal 12B of the adjacent unit cells 11 can be electrically connected.

  Next, as shown in FIG. 9, the connector 30 in a state in which the female terminal fitting 36 to which the electric wire 38 is crimped is accommodated is inserted into each connector accommodating portion 22 of the resin protector 21. When the connector 30 is inserted into the connector housing portion 22, the external terminal portion 18 of the conductive plate 15 enters from the terminal insertion port 33 formed at the lower end of the connector 30. When the connector 30 is pushed further downward, the external terminal portion 18 enters the connector 30 while elastically deforming the elastic contact piece 37A of the female terminal fitting 36. When the lower end portion of the housing 31 of the connector 30 abuts against the bottom wall of the connector housing portion 22 of the resin protector 21, the elastic contact piece 37A is elastically restored so that the external terminal portion 18 and the female terminal fitting 36 are connected in a conductive manner. (See FIGS. 11 and 12). Similarly, when all the connectors 30 are inserted into the connector housing portion 22 of the resin protector 21, the battery module M1 shown in FIGS. 1 and 2 is obtained. If the battery module M1 is connected to an ECU or the like via the multipolar connector 40, the voltage of the unit cell 11 can be detected.

(Operation and effect of this embodiment)
In the present embodiment, the stacked unit cell group 10 can be electrically connected by arranging a conductive plate member 15 having an external terminal portion 18 between the electrode terminal surfaces 13A and 13B. By connecting the external terminal portion 18 to the female terminal fitting 36 (voltage detection terminal) of the connector 30 accommodated in the connector accommodating portion 22 of the resin protector 21, the voltage detection circuit of the unit cell 11 is configured.
That is, in the present embodiment, the conductive plate member 15 that is a member that electrically connects the stacked unit cell group 10 can also have a function as a member that is connected to the voltage detection circuit.

  Therefore, according to the present embodiment, it is possible to provide the battery wiring module 20 capable of detecting the voltage of the single battery 11 in the battery module M1 including the stacked single battery group 10.

  Further, in the present embodiment, since the protrusion 16 protruding in the stacking direction of the unit cell group 10 is formed on at least one surface of the conductive plate member 15, it is arranged between the adjacent unit cells 11. Oxidation formed on the surface of the electrode terminal surfaces 13A and 13B of the unit cell 11 by the projections 16 projecting in the stacking direction of the unit cells 11 formed on the conductive plate 15 coming into contact with the electrode terminal surfaces 13A and 13B. The coating is broken and the new metal surface is exposed. Then, the exposed new metal surface and the electrode terminal surfaces 13A and 13B of the adjacent unit cells 11 are connected via a conductive plate material. Therefore, according to the present embodiment, the new surface exposed by the contact of the protrusion 16 on the electrode terminal surfaces 13A and 13B of the unit cell 11 and the electrode terminal surfaces 13A and 13B of the adjacent unit cell 11 form the conductive plate 15. Therefore, the contact resistance between the single cells 11 can be reduced.

  Further, according to the present embodiment, since the electrode terminal surfaces 13A and 13B are the aluminum electrode terminal surfaces 13A and 13B, the aluminum oxide film is broken by the protrusions 16 of the conductive plate 15 to expose the new metal surface. Therefore, the contact resistance can be reduced when the unit cells 11 are connected to form the unit cell group 10.

  Further, according to the present embodiment, since the conductive plate 15 is made of copper or copper alloy, the conductive plate 15 can be made excellent in strength and conductivity.

  In addition, according to the present embodiment, since the plating layer is formed on the surface of the conductive plate 15, the occurrence of electrolytic corrosion is delayed by the plating layer formed on the surface of the metal material constituting the conductive plate 15. It is possible to suppress or suppress.

  Further, according to the present embodiment, since the resin protector 21 is provided with the terminal holding portion 23 that holds the external terminal portion 18 of the conductive plate material 15, the resin protector 21 that holds the external terminal portion 18 is provided with the resin protector 21. By attaching to the unit cell group 10, the conductive plate 15 can be disposed between the electrode terminal surfaces 13 </ b> A and 13 </ b> B of the unit cell 11, so that the workability of the assembly work is improved.

  Further, according to the present embodiment, the resin protector 21 is displaced in the stacking direction of the unit cells 11 for each of the connector housing portions 22 and the region 22A in which the connector housing portions 22 are provided. And a displacement allowance portion 24 that allows the displacement of the pitch between the electrode terminals 12 due to manufacturing tolerances between the electrode terminals 12 of the unit cells 11 or expansion and contraction of the unit cells 11, The region 22A in which the connector accommodating portion 22 is provided is displaced in the stacking direction of the unit cells 11, and the pitch deviation is absorbed.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The battery wiring module 60 of the present embodiment is different from that of the first embodiment in that the resin protector 61 includes a plurality of units 61. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the following description, the up and down direction is based on the up and down direction in FIG. 22, and in the front and back direction, the left side in FIG.

(Single cell 51)
As shown in FIG. 15, a pair of locking claws 52 (an example of a locking portion 52) that locks the resin protector 61 is formed on the upper surface of the cell 51 that constitutes the cell group 50. The pair of locking claws 52 are L-shaped in side view, and as shown in FIGS. 18 and 19, both ends of the unit 61 constituting the resin protector 61 are inserted and locked.
As shown in FIGS. 13 and 14, a pair of locking claws 54 that lock the resin protector 61 on the upper surface of the electrode plate 53 </ b> A arranged at the front end portion (the left end portion in the drawing) as well as the unit cell 51. Is formed.

(Conductive plate 55)
The conductive plate 55 connecting the unit cells 51 is bent substantially vertically at the contact part 56 disposed between the electrode terminal surfaces 13A and 13B and the upper end of the contact part 56, and placed on the upper surface of the unit cell 51. It has a mounting portion 58 and an external terminal portion 59 that is bent substantially vertically from the mounting portion 58 and protrudes upward. The portion that forms a square shape on the surface of the contact portion 56 is a protrusion 56A that protrudes in the stacking direction of the single cells 51 when arranged between the single cells 51, and the periphery of the protrusion 56A is recessed from the protrusion 56A. It is partitioned by the groove 57.
The external terminal portion 59 is a portion led out to the outside when the conductive plate 55 is disposed between the electrode terminal surfaces 13A and 13B, and as shown in FIGS. 23 and 24, the bottom wall of the connector housing portion 62 And is disposed in the connector housing 62.

(Battery wiring module 60)
As shown in FIGS. 18 to 20, the resin protector 61 includes a plurality of units 61 in which one connector housing portion 62 is provided. The plurality of units 61 are not connected in a state where no connector is accommodated.

  The length in the longitudinal direction of the unit 61 is set to be substantially the same as the distance between the pair of locking claws 52 on the upper surface of the unit cell 51, and both ends of the unit 61 are locked by the pair of locking claws 52. Sometimes it doesn't rattle. The unit 61 has one connector housing portion 62, and a placement portion 58 of a conductive plate 55 can be inserted into the lower end portion of the portion corresponding to the connector housing portion 62 as shown in FIGS. A notch 64 is formed.

  The connector housing portion 62 is opened so that the connector 30 can be received from above, and the bottom wall (lower wall portion) of the connector housing portion 62 is a terminal holding for holding the external terminal portion 59 of the conductive plate 55. It functions as the unit 63 (see FIG. 23).

  Other configurations such as the configuration of the connector 30 are substantially the same as those of the first embodiment.

(Method for assembling battery module M2)
Next, an assembly method of the battery module M2 to which the battery wiring module 60 of the present embodiment is attached will be described.
A plurality (16 pieces) of the single cells 51 are arranged at positions where the electrode terminal surface 13A of the positive electrode terminal 12A and the electrode terminal surface 13B of the negative electrode terminal 12B of the adjacent single cells 51 face each other, and left and right end portions in FIG. The electrode plates 53A and 53B are disposed on the outer surface of the unit cell group 50 such that the electrode terminal surfaces 13A and 13B of the unit cell 51 disposed on the outermost side are not exposed.

  As shown in FIG. 17, the external terminal portion 59 of the conductive plate 55 is inserted and held in the bottom wall (terminal holding portion 63) of the connector housing portion 62 of the unit 61, and the battery wiring module 60 shown in FIG. Make it.

Next, the unit 61 is attached to each unit cell 51.
When the unit 61 is inserted into the pair of locking claws 52 of the unit cell 51 in the direction of the arrow shown in FIG. 18, both end portions of the unit 61 are locked by the locking walls 52A on the back side in the insertion direction. A unit cell 51 with a unit 61 as shown in FIG. 19 is obtained.

  By repeating the same operation, the unit 61 is also attached to the 16 unit cells 51 and the pair of engaging portions 54 of the electrode plate 53A on the front end (left end) side in FIG. 14 (see FIG. 20).

  Next, as shown in FIG. 20, the electrode plate 53A with the unit 61, the unit cell 51 with 16 units 61, and the electrode plate 53B are arranged at positions where the electrode terminal surfaces 13A and 13B face each other. Laminate side by side.

  Here, in this embodiment, since the plurality of units 61 are not connected to each other, when stacking the unit cells 51 with the units 61, there is a problem of pitch deviation due to manufacturing tolerances between the electrode terminals 12 of the unit cells 51. It does not occur, and the installation work can proceed smoothly.

  Next, each unit cell 51 is moved in a direction to narrow the interval between the adjacent unit cells 51, and a fixing means such as a holding plate (not shown) is attached and pressurized to a state as shown in FIG.

  At this time, the protrusion 56A protruding in the stacking direction of the unit cells 51 formed on the conductive plate 55 held by the unit 61 is in contact with the electrode terminal surface 13A of the positive electrode of the adjacent unit cell 51 and formed on the surface thereof. The formed aluminum oxide film is broken to expose the new metal surface. The surface (front surface) of the conductive plate 55 on which the protrusions 56A are formed is in contact with the new surface exposed on the positive electrode terminal surface 13A, and the back surface of the conductive plate 55 is adjacent to the negative electrode terminal surface 13B of the unit cell 51. Contact with. Thereby, the positive electrode terminal 12A and the negative electrode terminal 12B of the adjacent unit cells 51 can be electrically connected.

  Next, as shown in FIG. 21, when the connector 30 in which the female terminal fitting 36 to which the electric wire 38 is crimped is accommodated is inserted into the connector accommodation portion 62 of each unit 61, the battery shown in FIGS. 13 and 14 is obtained. Module M2 is obtained. If the battery module M2 is connected to an ECU or the like via the multipolar connector 40, the voltage of the unit cell 11 can be detected.

(Operation of this embodiment)
In the present embodiment, the stacked unit cell group 50 can be electrically connected by disposing the conductive plate member 55 having the external terminal portion 59 between the electrode terminal surfaces 13A and 13B. By connecting the external terminal portion 59 to the female terminal fitting 36 (voltage detection terminal) of the connector 30 accommodated in the connector accommodating portion 62 of the resin protector 61, a voltage detection circuit of the unit cell 51 is configured.
That is, also in this embodiment, the conductive plate member 55 that is a member that electrically connects the stacked unit cell group 50 can also have a function as a member that connects to the voltage detection circuit.

  Therefore, according to the present embodiment as well, similarly to the first embodiment, in the battery module M2 including the stacked unit cell group 50, the battery wiring module 60 that can detect the voltage of the unit cell 51 is provided. Can do.

  Further, in the present embodiment, since at least one surface of the conductive plate 55 is formed with a protrusion 56A that protrudes in the stacking direction of the unit cell group 50, it is arranged between the adjacent unit cells 51. The protrusions 56A protruding in the stacking direction of the unit cells 51 formed on the conductive plate 55 come into contact with the electrode terminal surfaces 13A and 13B, whereby the oxidation formed on the surface of the electrode terminal surfaces 13A and 13B of the unit cell 51. The coating is broken and the new metal surface is exposed. The exposed new metal surface and the electrode terminal surfaces 13A and 13B of the adjacent unit cells 51 are connected to each other through the conductive plate 55. Therefore, according to the present embodiment, the new surface exposed by the contact of the protrusion 56A on the electrode terminal surfaces 13A and 13B of the unit cell 51 and the electrode terminal surfaces 13A and 13B of the adjacent unit cell 51 form the conductive plate 55. Therefore, the contact resistance between the single cells 51 can be reduced.

  In addition, according to the present embodiment, since the electrode terminal surfaces 13A and 13B are aluminum electrode terminal surfaces, the aluminum oxide film can be broken and the new metal surface can be exposed by the protrusion 56A of the conductive plate 55. When the unit cells 51 are connected to form the unit cell group 50, the contact resistance can be reduced.

  According to the present embodiment, since the conductive plate 55 is made of copper or a copper alloy, the conductive plate 55 can be made excellent in strength and conductivity.

  Further, according to the present embodiment, since the plating layer is formed on the surface of the conductive plate 55, the occurrence of electrolytic corrosion is delayed by the plating layer formed on the surface of the metal material constituting the conductive plate 55. It is possible to suppress or suppress.

  In addition, according to the present embodiment, since the resin protector 61 is provided with the terminal holding portion 63 that holds the external terminal portion 59 of the conductive plate material 55, the resin protector 61 that holds the external terminal portion 59 is attached to the resin protector 61. By attaching to the unit cell group 50, the conductive plate 55 can be disposed between the electrode terminal surfaces 13A and 13B of the unit cell 51, so that the workability of the assembly work is improved.

  In addition, according to the present embodiment, the resin protector 61 is composed of a plurality of units 61 each having one connector housing portion 62. Therefore, the unit 61 having a single shape is produced and the unit 61 is simply connected. Since it suffices to prepare in accordance with the number of connectors 30 connected to the battery group 50, the resin protector 61 can be manufactured with one mold, and the manufacturing cost can be reduced.

  In addition, according to the present embodiment, since the single battery 51 is provided with the locking claw 54 that locks the resin protector 61, the resin protector 61 is locked by the locking claw 54 of the single battery 51. Therefore, the unit 61 (resin protector 61) does not rattle, and workability when housing the connector 30 in the connector housing portion 62 is improved.

<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-described embodiment, the projection 16 is formed on one surface of the conductive plate 15. However, the projection may be formed on both sides of the conductive plate. Further, the shape of the protrusion is not limited to a square shape, and may be a shape in which, for example, peaks and valleys are alternately formed.
(2) In the above embodiment, an example of a lithium ion battery in which the electrode terminal surface 13A of the positive electrode is an aluminum electrode terminal surface and the electrode terminal surface 13B of the negative electrode is a copper electrode terminal surface is shown. It is not limited to this.
(3) In the above embodiment, the conductive plate material 15 made of copper or copper alloy and having a tin plating layer formed on the surface is shown. However, the metal material constituting the conductive plate material has conductivity. If it does, iron etc. may be sufficient. Further, the metal constituting the plating layer may be nickel, gold, silver, or the like, or may be one without a plating layer. From the viewpoint of preventing electrolytic corrosion, the metal constituting the plating layer preferably has a small potential difference from the metal constituting the electrode terminal surface.
(4) In the first embodiment, the conductive plate 15 having a substantially rectangular shape is used. However, the conductive plate 15 may have a circular shape or the like as long as it has a protrusion, or the electrode terminal surface of the unit cell. If there is a contact portion, the size is not limited.
(5) In the above embodiment, the resin protector 21 is provided with the terminal holding portion 23 for holding the external terminal portion 18. However, the external terminal portion of the conductive plate is held on the unit cell side. It may be.
(6) Although the integrated resin protector 21 in which the displacement allowable portion 24 is formed is shown in the above embodiment, an integrated resin protector in which the displacement allowable portion is not formed may be used.

DESCRIPTION OF SYMBOLS 10,50 ... Single cell group 11,51 ... Single cell 12 ... Electrode terminal 12A ... Positive electrode terminal 12B ... Negative electrode terminal 13 ... Electrode terminal surface 13A ... Positive electrode terminal surface 13B ... Negative electrode terminal surface 15, 55 ... Conductivity Plate material 16, 56A ... Projection 17 ... Groove portion 18, 59 ... External terminal portion 20, 60 ... Battery wiring module 21 ... Resin protector 22, 62 ... Connector housing portion 22A ... Region 23, 63 ... Terminal holding portion 24 ... Displacement allowable 30: Connector 36: Female terminal fitting (voltage detection terminal)
52 ... Locking claw (locking part)
52A ... Locking wall 61 ... Unit (resin protector)
M1, M2 ... Battery module

Claims (9)

A plurality of unit cells each having positive and negative electrode terminal surfaces on the front and back sides are attached to a group of unit cells connected in series by arranging and laminating the electrode terminal surfaces of the adjacent unit cells facing each other. A module for battery wiring,
An external terminal portion that is arranged between the electrode terminal surfaces of the adjacent unit cells, electrically connects the electrode terminal surfaces of the adjacent unit cells, and is led out from between the electrode terminal surfaces. A battery wiring module comprising: a resin protector provided with a connector housing portion capable of housing a connector having a voltage detection terminal connected to the external terminal portion of the conductive plate material having. The battery wiring module according to claim 1, wherein a protrusion projecting in the stacking direction of the unit cell group is formed on at least one surface of the conductive plate member. The connection structure of the unit cell group according to claim 2, wherein the electrode terminal surface is an aluminum electrode terminal surface. The connecting structure for a single battery group according to any one of claims 1 to 3, wherein the conductive plate is made of copper or a copper alloy. The battery wiring module according to any one of claims 1 to 4, wherein a plating layer is formed on a surface of the conductive plate material. The battery wiring module according to any one of claims 1 to 5, wherein the resin protector is provided with a terminal holding part that holds the external terminal part of the conductive plate member. The resin protector is provided with a plurality of the connector accommodating portions and a displacement allowing portion that allows the region to be displaced in the stacking direction of the unit cells for each region where the connector accommodating portions are provided. The battery wiring module according to claim 1, wherein the battery wiring module is provided. The battery wiring module according to any one of claims 1 to 6, wherein the resin protector includes a plurality of units having one connector housing portion. The battery wiring module according to any one of claims 1 to 8, wherein the unit cell is provided with a locking portion for locking the resin protector.

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