WO2013180158A1

WO2013180158A1 - Battery wiring module

Info

Publication number: WO2013180158A1
Application number: PCT/JP2013/064864
Authority: WO
Inventors: 慎一高瀬; 平井　宏樹; 淳一若山; 裕志大野; 土屋　豪範
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社; トヨタ自動車株式会社
Priority date: 2012-05-29
Filing date: 2013-05-29
Publication date: 2013-12-05
Also published as: JP2013247056A

Abstract

In a battery module (M1) provided with a cell group (10) formed by arranging side-by-side multiple single cells (11) having positive and negative electrode terminals (12), this battery wiring module (20) is attached to the cell group (10) and is provided with a connection member (21) which is connected to the single cells (11), and with a resin protector (30) which is made of insulating resin, has a holding unit (32) for holding the connection member (21), and is attached to the cell group (10). The resin protector (30) integrally comprises the holding unit (32) and a duct (38) through which gas generated inside of the battery is discharged to outside of the cell (11).

Description

Battery wiring module

The present invention relates to a battery wiring module.

Conventionally, battery modules have been provided with an exhaust structure for exhausting gas generated from a single cell (see, for example, Patent Document 1).

JP 2011-65906 A

In the battery module described in Patent Document 1, an exhaust space through which gas generated from the unit cell passes is provided between the case that houses the unit cell group and the inner lid that is attached to the unit cell group in the case. In addition, the inner lid is provided with an exhaust hole for exhausting gas generated from the single cell to the exhaust space. In the battery module described in Patent Document 1, a partition wall that partitions the exhaust space is also formed between the inner lid and the upper surface of the case.

By the way, normally, members such as a bus bar for electrically connecting the cells and members such as a voltage detection terminal for detecting the temperature and voltage of the cells are connected to the cell group constituting the battery module. ing. Accordingly, there is a concern that the structure of the battery module becomes complicated if an exhaust structure for exhausting gas generated from the unit cells is provided while arranging the members connected to the unit cell group.

The present invention has been completed based on the above situation, and an object of the present invention is to simplify a gas exhaust structure for exhausting gas discharged from a single cell in a battery module.

In order to solve the above-mentioned problems, the present invention provides a battery wiring module attached to the unit cell group in a battery module including a unit cell group in which a plurality of unit cells having positive and negative electrode terminals are arranged, A connection member connected to the unit cell; and a resin protector made of an insulating resin that has a holding unit for holding the connection member and is attached to the unit cell group. The resin protector includes the holding unit and The battery wiring module is integrally provided with a duct for venting a gas generated inside the unit cell and exhausting the gas outside the unit cell.

In the present invention, the battery wiring module is integrally provided with a holding portion that holds a connection member connected to the unit cell and a duct that vents a gas generated from the inside of the unit cell and exhausts it to the outside. A resin protector is provided. Therefore, in the present invention, the duct can be arranged in the battery module simply by attaching the battery wiring module to the unit cell group, so that it is not necessary to separately attach the duct to the battery module.
As a result, according to the present invention, in the battery module, the gas exhaust structure for exhausting the gas discharged from the single cell can be simplified.

The present invention may have the following configurations.
The unit cell is provided with a gas discharge unit that discharges gas generated inside the unit cell, the resin protector is attached to cover the gas discharge unit of the unit cell, and the resin protector includes the resin A structure may be formed in which a space functioning as a duct is formed between a surface of the protector facing the gas discharge portion of the unit cell and a surface where the gas discharge unit of the unit cell is formed. .
According to such a configuration, since the duct is formed simply by attaching the resin protector to the single cell group, the gas exhaust structure can be made very simple.

A seal member may be attached between the resin protector and the unit cell group, and the duct may be formed by attaching the resin protector to the unit cell group.
With such a configuration, a sealed duct is formed simply by attaching the resin protector to the unit cell group, and therefore, exhaust efficiency can be increased with a simple structure.

Either one of the resin protector and the unit cell may be formed with a protrusion protruding from the surface arranged on the other side, and the other may be formed with a receiving part for receiving the protrusion. .
If it is set as such a structure, a resin protector will be positioned with respect to a cell group, when a protrusion is received by a receiving part.

According to the present invention, in the battery module, the gas exhaust structure for exhausting the gas exhausted from the single cell can be simplified.

FIG. 1 is a perspective view of the battery module of the first embodiment. FIG. 2 is a perspective view of the cell group to which the battery wiring module is attached with the lid removed. FIG. 3 is a plan view of the battery wiring module with the lid removed. FIG. 4 is a perspective view of the resin protector. FIG. 5 is a plan view of the resin protector. FIG. 6 is a partial cross-sectional view showing a state in which the resin protector is attached to the unit cell. FIG. 7 is a partial cross-sectional view of a unit cell to which a resin protector is attached.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the module 20 for battery wiring according to the present embodiment includes a unit cell group 10 in which a plurality of (in this embodiment, 14) unit cells 11 having positive and negative electrode terminals 12 are arranged. It can be attached. 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.

The 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 electrode terminal 12 A and the negative electrode terminal 12 B of the different single cells 11 by the battery wiring module 20. In the following description, the upper side in FIGS. 6 and 7 is the upper side and the lower side is the lower side.

(Single cell 11)
The unit cell 11 has a flat rectangular parallelepiped shape. As shown in FIG. 1, a positive electrode terminal 12 A and a negative electrode terminal 12 B are formed on the upper surface 11 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 13 protruding in a round bar shape upward from the pedestal. A thread 13A is formed on the surface of the electrode post 13 (see FIG. 6). 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 13 is inserted into a through hole 23 of a bus bar 21 (an example of a connection 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.

As shown in FIG. 6 and FIG. 7, a gas discharge portion 14 for discharging the gas generated inside the single cell 11 to the outside is formed in the approximate center of the upper surface 11 A of the single cell 11. Further, a concave portion 15 is formed on the upper surface 11A of the unit cell 11 between the gas discharge portion 14 and the

electrode terminals

12A and 12B. The concave portion 15 has a function of receiving the protrusion 37 protruding from the lower end portion of the resin protector 30 and positioning the resin protector 30 on the unit cell 11 (an example of a receiving portion).

(Battery wiring module 20)
The battery wiring module 20 is attached to the approximate center of the upper surface 11 A (electrode terminal surface) of the unit cell group 10.

As shown in FIGS. 2 and 3, 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 bars 21. And a resin protector 30 made of a synthetic resin having a holding portion 32 for holding the bus bar 21 and the FPC. 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 FIG. Each lid 16 includes a substantially central flat part 16A and a side edge part 16B connected to a pair of side edges in the longitudinal direction of the flat part 16A via a hinge 16C. The flat portion 16A is a portion covering the FPC, and the two side edge portions 16B are portions covering the terminal connection portions 22 connected to the electrode terminals 12 of the bus bar 21, respectively.

(Resin protector 30)
As shown in FIGS. 2 and 3, the resin protector 30 made of an insulating resin material is arranged substantially parallel to the arrangement direction of the cells 11 and holds the FPC and the bus bar 21 in a stacked state. 32 and a partition wall 33 that partitions the holding portion 32 for each arrangement region of the bus bar 21.

Now, as shown in FIGS. 6 and 7, the holding portion 32 of the resin protector 30 has a shape protruding upward, and its lower side surface 30A and the upper surface 11A of the unit cell 11 (the gas discharge portion 14 is formed). A space (venting space 38) that functions as a duct 38 that vents the gas discharged from the gas discharging portion 14 of the unit cell 11 and exhausts it to the outside is formed between the surface 11A). Although not shown in detail, the ventilation space 38 communicates with the outside of the battery module M1, and the gas discharged from the gas discharge unit 14 to the ventilation space can be discharged out of the battery module M1.

As shown in FIG. 2, the upper surface 30B (the surface on which the FPC is placed) of the holding portion 32 is formed along the side edge in the longitudinal direction of the holding portion 32, and the bus bar 21 and the FPC are stacked. A plurality of attachment projections 34 that can be attached are 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.

As shown in FIGS. 6 and 7, a protrusion 37 protruding downward is provided at the lower end of the resin protector 30. The protrusion 37 is formed by attaching a seal member 40 to the lower end of the resin protector 30. The protrusion 37 of the resin protector 30 is received in the recess 15 formed in the unit cell 11, whereby the resin protector 30 is positioned with respect to the unit cell group 10 and is sealed in the duct 38 (ventilation space 38). Is to be formed. As the sealing member 40, a sponge-like member such as urethane foam, rubber or the like can be used.

(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 this embodiment, as shown in FIG. 2, two types of bus bars 21 are used as the bus bar 21. Of the bus bar 21 on the back side shown in FIG. 2, the bus bar 21 disposed at the left and right ends in the drawing is referred to as a second bus bar 21B, and the other bus bars 21 are referred to as first bus bars 21A.

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 attachment portion 25 attached to the resin protector 30.

A through hole 23 through which the electrode post 13B 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 second bus bar 21, and two through-holes 23 are formed in each first bus bar 21A.

The mounting 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 30B of the holding portion 32. 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 oblong 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 second bus bar 21B, and two mounting holes 26 are formed in the first bus bar 21A.

(FPC)
An FPC is connected to the mounting portion 25 of the bus bar 21. In FPC, a plurality of conductive paths are formed on one or both sides of an insulating base film made of, for example, a polyimide film or a liquid crystal film by a printed wiring technique, and the surface of the conductive paths is a protective film (for example, a polyimide film). The structure is covered with

In the FPC, a voltage detection conductive path that forms a voltage detection circuit, a temperature control conductive path that forms a temperature control circuit, and the like are formed. For example, an ECU (not shown) or the like is connected to the voltage detection conductive path and the temperature control conductive path. 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. Oval attachment holes that can receive the attachment protrusions 34 of the holding unit 31 are formed at both ends in the longitudinal direction of the FPC.

(Assembly method of battery wiring module 20)
Next, a method for assembling the battery wiring module 20 will be described.
When each attachment hole 26 of the bus bar 21 to which the FPC is connected in advance is inserted into the attachment protrusion 34 of the resin protector 30 and attached to the resin protector 30, the battery wiring module 20 is obtained.

Next, the battery wiring module 20 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.

Here, the protrusion 37 formed at the lower end of the resin protector 30 is arranged so as to correspond to the recess 15 formed in the unit cell 11, and the battery wiring module 20 is attached to the unit cell group 10. The protrusion 37 of the resin protector 30 is received in the recess 15 of the unit cell 11, and the resin protector 30 is positioned with respect to the unit cell group 10. By attaching the battery wiring module 20 (resin protector 30) to the unit cell group 10, a duct 38 (ventilation space) is formed between the lower side surface 30A of the resin protector 30 and the upper surface 11A of the unit cell group.

Next, the electrode terminals 12 (electrode posts 13) of the unit cells 11 are inserted into the through holes 23 of the bus bars 21 so that the terminal connection portions 22 of the bus bars 21 are in contact with the pedestals of the electrode terminals 12, A screw member (not shown) is screwed into each electrode post 13 and fixed.

At this time, since the resin protector 30 is provided with the partition wall 33 that maintains the insulation state of the adjacent bus bars 21, 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 13, 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 battery wiring module 20 includes a holding unit 32 that holds the bus bar 21 connected to the unit cell 11, a duct 38 that vents gas generated from the inside of the unit cell 11 and exhausts it to the outside. Since the duct 38 can be disposed in the battery module M1 simply by attaching the battery wiring module 20 to the unit cell group 10, the duct 38 is separately provided as a battery module. It is not necessary to attach to M1.
As a result, according to this embodiment, in the battery module M1, the gas exhaust structure for exhausting the gas exhausted from the unit cell 11 can be simplified.

In particular, in the present embodiment, the unit cell 11 is provided with a gas discharge unit 14, and the resin protector 30 is attached so as to cover the gas discharge unit 14 of the unit cell 11, and the gas discharge unit of the unit cell 11. 14 is a structure in which a space functioning as a duct 38 is formed between the surface 30A facing the surface 14 and the surface 11A where the gas discharge part 14 of the unit cell 11 is formed. Therefore, according to the present embodiment, the duct 38 is formed simply by attaching the resin protector 30 to the unit cell group 10, so that the gas exhaust structure can be made very simple.

Further, according to the present embodiment, the seal member 40 is attached between the resin protector 30 and the unit cell group 10, and the duct 38 is formed by attaching the resin protector 30 to the unit cell group 10. Therefore, by simply attaching the resin protector 30 to the unit cell group 10, the sealed duct 38 is formed, and the exhaust efficiency can be increased with a simple structure.

Furthermore, according to the present embodiment, the resin protector 30 is formed with the protrusion 37 protruding from the lower end portion, and the unit cell 11 is formed with the recess 15 for receiving the protrusion 37 of the resin protector 30. When the protrusion 37 is received by the recess 15, the resin protector 30 is positioned with respect to the unit cell group 10.

<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, a resin having a structure in which a duct 38 is formed between the surface 30A of the resin protector 30 facing the unit cell 11 and the surface 11A of the unit cell 11 where the gas discharge part 14 is formed. Although the protector 30 is shown, a resin protector or the like in which a cylindrical duct is integrally formed with the holding portion may be used.
(2) Although the said embodiment showed the thing of the structure provided with the sealing member 40 between the resin protector 30 and the cell 11, you may not provide a sealing member.
(3) In the above embodiment, the resin protector 30 is formed with the protrusion 37 protruding from the surface (lower surface) disposed on the unit cell 11 side, and the unit cell 11 receives the protrusion 37 of the resin protector 30. Although the example which formed 15 was shown, you may form a recessed part (receiving part) in a resin protector, and may form a protrusion in a cell.
(4) In the above-described embodiment, the duct 38 that does not include the blowing unit that blows air into the duct 38 is shown. However, the duct 38 may include a blowing unit. Moreover, you may attach the temperature sensor etc. which adjust the temperature of the air in a duct to a duct.
(5) In the above embodiment, the voltage detection conductive path and the temperature control conductive path are formed by FPC. However, even if the outer periphery of a plurality of strands is covered with a resin material, Good. In particular, the temperature control conductive path may have a structure in which a thermistor whose electric resistance changes with temperature change is mounted on the tip of the circuit.
(6) It is good also as a structure which mounts the control circuit for battery monitoring comprised by connecting the printed circuit board or the conductor part of FPC on the resin protector 30. FIG.

M1 ... battery module 10 ... single cell group 11 ... single cell 11A ... upper surface (surface on which a gas discharge part is formed)
DESCRIPTION OF SYMBOLS 12 ... Electrode terminal 12A ... Positive electrode terminal 12B ... Negative electrode terminal 14 ... Gas exhaust part 15 ... Recessed part (receiving part)
20 ... Battery wiring module 21 ... Bus bar (connection member)
DESCRIPTION OF SYMBOLS 22 ... Terminal connection part 23 ... Through-hole 25 ... Mounting part 26 ... Mounting hole 30 ... Resin protector 32 ... Holding part 33 ... Partition wall 34 ... Mounting protrusion 37 ... Projection 38 ... Duct (ventilation space)
40 ... Sealing member

Claims

In a battery module comprising a unit cell group in which a plurality of unit cells having positive and negative electrode terminals are arranged, a battery wiring module attached to the unit cell group,
A connection member connected to the unit cell; and a resin protector made of an insulating resin having a holding unit for holding the connection member and attached to the unit cell group,
The battery protector module, wherein the resin protector is integrally provided with the holding portion and a duct that vents a gas generated inside the unit cell and exhausts the gas outside the unit cell.
The unit cell is provided with a gas discharge unit for discharging gas generated inside the unit cell,
The resin protector is attached so as to cover the gas discharge portion of the unit cell, and the resin protector includes a surface of the surface of the resin protector that faces the gas discharge unit of the unit cell, and a gas discharge of the unit cell. The battery wiring module according to claim 1, wherein a space functioning as a duct is formed between the surface on which the portion is formed.
A seal member is attached between the resin protector and the unit cell group,
The battery wiring module according to claim 1 or 2, wherein the duct is formed by attaching the resin protector to the unit cell group.
One of the resin protector and the unit cell is formed with a protrusion protruding from the surface arranged on the other side,
The battery wiring module according to any one of claims 1 to 3, wherein a receiving portion that receives the protrusion is formed on the other side.