JP2017228497A - Assembled battery bus bar and assembled battery - Google Patents

Abstract

An object of the present invention is to provide an assembled battery bus bar and an assembled battery that can shorten the connection distance to the outside, such as another assembled battery, without changing the arrangement of a plurality of battery cells. A bus bar connected to a positive electrode terminal or a negative electrode terminal of a secondary battery located at an end when a plurality of secondary batteries are arranged in parallel when the secondary battery is attached to the positive electrode terminal or the negative electrode terminal A first connection portion substantially parallel to a surface of the secondary battery on which the positive electrode terminal and the negative electrode terminal are provided, a second connection portion substantially parallel to the first connection portion, and the second connection portion. A battery pack bus bar comprising: a third connection portion substantially perpendicular to the connection portion; and a fourth connection portion substantially perpendicular to the second connection portion and the third connection portion. [Selection] Figure 1

Description

  Embodiments described herein relate generally to an assembled battery bus bar and an assembled battery.

In the field of storage batteries and the like, it is widely practiced to connect a plurality of battery cells having a small output in order to take out desired power to form one assembled battery. In such a battery pack, the electrodes of adjacent battery cells are connected by a flat bus bar.

JP2015-164101A

When a plurality of battery cells are connected in this way, the battery cells in the assembled battery are often arranged so that the volume of the assembled battery is minimized. Therefore, the arrangement of the battery cells is uniquely determined by the number of battery cells and the like, and the positions of the positive and negative electrodes of the battery cells corresponding to both ends of the battery cell group in which a plurality of battery cells are connected may be uniquely determined.

On the other hand, for example, when connecting assembled batteries, it is preferable that the connection wiring is short, but the position of the positive electrode or the negative electrode of the battery cells corresponding to both ends of the battery cell group is not necessarily the same when connecting the assembled batteries. The position is not necessarily shortened.

Accordingly, an object of the present invention is to provide an assembled battery bus bar and an assembled battery that can shorten the connection distance to the outside, such as another assembled battery, without changing the arrangement of a plurality of battery cells.

In order to solve the above problems, the battery pack bus bar of the present embodiment is
A bus bar connected to a positive terminal or a negative terminal of a secondary battery located at an end when a plurality of secondary batteries are arranged in parallel,
When attached to the positive electrode terminal or the negative electrode terminal, a first connection portion substantially parallel to the surface of the secondary battery on which the positive electrode terminal and the negative electrode terminal are provided;
A second connection portion substantially parallel to the first connection portion;
A third connection portion substantially perpendicular to the second connection portion;
A fourth connection portion substantially perpendicular to the second connection portion and the third connection portion;
It has.

The perspective view of the assembled battery which concerns on embodiment. The perspective view of the secondary battery which concerns on embodiment. The disassembled perspective view of the assembled battery which concerns on embodiment. The perspective view of the bus bar for assembled batteries which concerns on embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of an assembled battery 1 according to the embodiment. The casing 12 of the battery pack 1 includes a rectangular box-shaped lower case 16 whose upper surface is open, an upper case 18 that covers the upper surface side of the lower case 16 that is open, and further, opposite to the lower case 16 of the upper case. And a cover 20 covering the side. A plurality of battery cells 10 are accommodated in the housing 12.

Each component of the housing 12 has an insulating synthetic resin material (for example, modified PPE (polyphenylene ether), PFA (perfluoroalkoxyalkane, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), etc.) ) Is used. Further, as the synthetic resin material of the housing 12, a thermoplastic resin can be used. For example, olefin resin such as PE, PP, PMP, polyester resin such as PET, PBT, PEN, POM resin, PA6. , PA66, PA12 and other polyamide resins, PPS resins, LCP
Crystalline resins such as resins and their alloy resins, or PS, PC, PC / ABS
, ABS, AS, modified PPE, PES, PEI, PSF, and other amorphous resins and their alloy resins can be used.

FIG. 2 shows the battery cell 10. The battery cell 10 is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion battery. For example, a flat or substantially rectangular outer container 2 formed of aluminum or an aluminum alloy, and non-aqueous electrolysis in the outer container 2. An electrode body (not shown) housed together with the liquid.

The outer container 2 includes a container main body 2a having an open upper end and a container main body 2a welded to the container main body 2a.
It consists of a rectangular plate-like lid body 2b with the opening of a closed, and the inside is formed fluid-tight. The container main body 2 a of the outer container 2 includes a pair of long side surfaces 43 and a pair of short side surfaces 44 shorter than the long side surfaces 43. The lid 2b of the outer container 2 includes a positive electrode terminal 3 and a negative electrode terminal 4, and the positive electrode terminal 3 and the negative electrode terminal 4 are electrically connected to the electrode body. Moreover, the gas discharge valve 5 which discharges | emits the gas generate | occur | produced in the battery cell 10 is provided, Furthermore, the injection hole 6 for inject | pouring electrolyte solution into the battery cell 10, and the sealing which seals the injection hole 6 It has a plate 7 and the like.

For example, the electrode body is formed in a flat rectangular shape by winding a positive electrode plate and a negative electrode plate in a spiral shape with a separator interposed therebetween, and further compressing the electrode plate in the radial direction.

FIG. 3 is a perspective view of the battery pack 1 with the cover 20 removed. FIG. 3 shows an example in which nine battery cells 10 are connected in series. The battery cells 10 are arranged in the assembled battery 1 with the long side surfaces 43 facing each other to form a battery cell group. Further, the positive electrode terminal 3 and the negative electrode terminal 4 are electrically connected to the positive electrode terminal 3 or the negative electrode terminal 4 of another battery cell 10 by a bus bar 21 attached to the upper case 18. The bus bar 21 is formed by bending a conductive metal plate such as aluminum or brass.

Further, two electrode terminals respectively possessed by the battery cell 10a and the battery cell 10b arranged at both ends of the battery cell group, that is, one of the positive electrode terminal 3 and the negative electrode terminal 4 are connected to the bus bar 22 shown in FIG. ing. The bus bar 22 is provided, for example, at corners (four corners) of the rectangular upper case 18 of the assembled battery 1. The bus bar 22 has a structure capable of connecting one of the positive electrode terminal 3 and the negative electrode terminal 4 of the battery cell 10 to the outside of the assembled battery 1 (for example, another assembled battery or a load such as a motor).

The bus bar 22 is formed by bending a metal plate such as conductive aluminum or brass, and includes a first connection portion 26 having, for example, a welding hole 26 a for connecting to the terminal of the battery cell 10. ing. For example, the first connection portion 26 is substantially parallel to the terminal surface of the battery cell 10 and is electrically connected.

The bus bar 22 includes a joint portion 28 extending from the first connection portion 26 in a substantially right angle direction, and further includes a second connection portion 23 extending from the joint portion 28 in a substantially right angle direction. Furthermore, the second connection part 23 includes a third connection part 24 and a fourth connection part 25 extending in a substantially right angle direction. The third connection portion 24 and the fourth connection portion 25 are arranged so as to be substantially orthogonal to each other. In addition, for example, to connect a harness for connecting to another assembled battery and the connection portion 23 with, for example, a screw, the hole 23a is connected to the second connection portion 23, and the hole 24a is connected to the third connection portion 24. The hole 25a is formed in the fourth connecting portion 25.

Further, the bus bar 22 is provided with a connection piece 27 in which a hole 27a for screwing and fixing to a control circuit board (not shown) or the like is formed.

Here, the second connection portion 23 forms a plane substantially parallel to the first connection portion 26 and the upper surface of the cover 20, for example. Further, the third connection portion 24 forms a plane substantially parallel to the long side surface of the upper case 18, for example, and the fourth connection portion 25 forms a plane substantially parallel to the short side surface of the upper case 18, for example. Yes.

Here, the first connection part 26 and the joint part 28 are connected by a bent part 31, and the joint part 28 is connected.
And the second connecting portion 23 are connected by a bent portion 32, the second connecting portion 23 and the third connecting portion 24 are connected by a bent portion 34, and the second connecting portion 23 and the fourth connecting portion. 25 is connected by a bent portion 33. Here, the bent portions 31, 32, 33, 34 may have a bending angle of approximately 90 degrees, or may have a bending angle of 90 degrees or more.

Further, as shown in FIG. 3, the battery cells 10 a and the battery cells 10 b arranged at both ends of the battery cell group are electrically connected to the bus bar 30 via the bus bar 22.

The bus bar 30 is disposed in a space formed by, for example, a control circuit board (not shown) installed between the cover 20, the bus bar 22, and the upper case 18. The bus bar 30 is extended in a direction orthogonal to the arrangement direction of the battery cell group, and extended so as to be electrically connected to the battery bar 10a and the bus bar 22 not connected to the battery cell 10b.

The end of the bus bar 30 is provided with a hole 30a and a hole 30b for connecting to the first connection bus bar 22 with, for example, screws, and the bus bar 30 is formed by bending a conductive metal plate such as aluminum or brass. It is formed by molding.

As shown in FIG. 1, for example, a corner (four corners) on the upper surface of the cover 20 has a hole 50 through which a screw can be inserted into a hole provided in the bus bar 22 and the bus bar 30. Further, at the corners (four corners) of the upper case 18 and the corners (four corners) on the side surface of the cover 20, notches 51 through which screws can be inserted into the holes provided in the bus bar 22 and the bus bar 30 are provided. Have.

According to the embodiment as described above, the second connection portion 23 or the third connection portion 2 of the bus bar 22.
4 or the fourth connecting portion 25, externally, for example, external addition such as a motor, other assembled battery 1,
It becomes possible to connect to a charge / discharge device or the like. That is, it is possible to electrically connect to the outside from three directions perpendicular to each other. Therefore, compared with the case where only one direction can be connected from the bus bar to the outside, the connection distance between the assembled battery 1 and the outside can be shortened, and the connection member can be saved. In addition, since the connection distance can be shortened, the installation space for the assembled battery 1 and other devices connected to the assembled battery 1 can be reduced, so that the assembled battery 1 and the assembled battery 1 can be reduced.
It is possible to improve the volume energy density including other devices connected to the. Also,
By improving the degree of freedom in combining the assembled battery 1 and the like, it is easy to install even in a limited space.

Further, for example, when the battery cells 10 are accommodated in the assembled battery 1 with the long side surfaces 43 of the battery cells 10 facing each other and connected in series, one end of the battery cell group to which the plurality of battery cells 10 are connected is stored. The positions of the positive electrode and the negative electrode at the other end are uniquely determined. For example, as shown in FIG. 3, when nine battery cells 10 are connected in series, the positive electrode at one end of the battery cell group to which the nine battery cells 10 are connected and the negative electrode at the other end are connected to the battery cell group. If the battery cell group when viewed from the side of the
Located diagonally. Similarly, the positive electrode at one end and the negative electrode at the other end of the battery cell group in which ten battery cells 10 are connected in series are regarded as a square when the battery cell group is viewed from the side of the electrode. , Located on the same side.

Here, for example, the positive electrode at one end of the battery cell group electrically connected in parallel or in series is electrically connected to the bus bar 30 via, for example, the bus bar 22 (here, the bus bar 22a). By being electrically connected to the bus bar 22 that is not electrically connected to the battery cell 10, it is possible to electrically connect to the outside via a bus bar 22 from a position different from the bus bar 22. it can. Therefore, the location that can be connected to the outside has been uniquely determined by the arrangement of the battery cells, but by using the bus bar 30, the location that can be connected to the outside can be changed as appropriate. Therefore, the connection distance between the assembled battery 1 and the outside can be shortened, and the connection member can be saved. In addition, since the connection distance can be shortened, the installation space of the assembled battery 1 and other devices connected to the assembled battery 1 can be reduced, so the assembled battery 1 and other devices connected to the assembled battery 1 are included. The volume energy density can be improved. Moreover, it becomes easy to install even if it is a limited space by improving the degree of freedom of how to combine the assembled battery 1 and the like.

Further, by combining the bus bar 22 and the bus bar 30, the assembled battery 1 becomes the battery cell 1.
Without depending on the arrangement of 0, it becomes possible to take out electricity in an arbitrary place in an arbitrary direction, space saving of the assembled battery 1 etc., high energy density, combination of the assembled battery 1 etc. The degree of freedom can be improved.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions can be made without departing from the spirit of the invention.
Can be replaced or changed. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Battery assembly, 2 ... Exterior container, 3 ... Positive electrode terminal, 4 ... Negative electrode terminal, 5 ... Gas discharge valve, 6 ... Injection hole, 7 ... Sealing plate, 10 ... Battery cell, 16 ... Lower case, 18 ... Upper case, 20 ... cover,
21, 22, 30 ... bus bar, 26 ... first connection part, 23 ... second connection part, 24 ... third connection part, 25 ... fourth connection part, 50 ... hole, 51 ... notch part

Claims (3)

A bus bar connected to a positive terminal or a negative terminal of a secondary battery located at an end when a plurality of secondary batteries are arranged in parallel,
When attached to the positive electrode terminal or the negative electrode terminal, a first connection portion substantially parallel to the surface of the secondary battery on which the positive electrode terminal and the negative electrode terminal are provided;
A second connection portion substantially parallel to the first connection portion;
A third connection portion substantially perpendicular to the second connection portion;
A fourth connection portion substantially perpendicular to the second connection portion and the third connection portion;
A battery pack bus bar. The third connection portion is disposed in parallel with one side surface of the case accommodating the plurality of secondary batteries, and the fourth connection portion is disposed in parallel with a side surface orthogonal to the one side surface of the case. The
The assembled battery bus bar according to claim 1. A plurality of secondary batteries;
A first connection portion substantially parallel to a surface of the secondary battery on which the positive electrode terminal and the negative electrode terminal are provided, and the first connection when attached to the positive electrode terminal or the negative electrode terminal of the secondary battery. A second connection portion substantially parallel to the second connection portion, a third connection portion substantially perpendicular to the second connection portion, and a fourth connection substantially perpendicular to the second connection portion and the third connection portion. A battery pack bus bar having a portion,
A substantially rectangular parallelepiped assembled battery.

Images