CN211125802U

CN211125802U - Power battery module busbar

Info

Publication number: CN211125802U
Application number: CN201921568363.XU
Authority: CN
Inventors: 李世明; 徐秋鹏
Original assignee: Jiangxi Yotteo Auto Technology Co ltd
Current assignee: Jiangxi Yotteo Auto Technology Co ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-07-28
Anticipated expiration: 2029-09-20

Abstract

The utility model discloses a power battery module busbar, electrically conductive connection piece (7) for stratiform composite metal material, electrically conductive connection piece (7) on the laser welding region be equipped with aperture (9). Adopt above-mentioned technical scheme, make electrically conductive connection piece laser welding spot surround regional trompil, make the solder joint visual, welding quality is visual promptly, reduces trouble and hidden danger, and then improves battery module busbar and electric core utmost point post welding quality.

Description

Power battery module busbar

Technical Field

The utility model belongs to the technical field of hybrid vehicle driving system or pure electric vehicles driving system, a structure and manufacturing approach that relate to power battery. More specifically, the utility model relates to a power battery module busbar.

Background

The importance of new energy automobiles in all countries in the world is paid to, so that the rechargeable battery has unprecedented development opportunity. The new energy automobile is powered by a power battery system, and the lithium ion battery becomes a main variety of the power battery due to the advantages of large energy density, good safety, long cycle life and the like.

The lithium ion power battery system generally comprises a battery PACK, a battery management system, a wire harness, a high-voltage distribution box, an auxiliary device and the like. The battery PACK generally comprises a battery module, a battery management system sampling system, a wire harness, an auxiliary device and the like. There are also battery systems with only one battery PACK. The battery module comprises a battery module structural member, a battery core, a conductive connecting sheet, a sampling line, a connector assembly and the like.

In the battery module, the series and parallel connection of the battery cores mainly has two modes,

one is to fix the bus bar to the cell holder by using a locking screw, such as the battery post connecting piece disclosed in patent application 201620973779.X, as shown in fig. 1. The technology has long working time, and the screw falls into the battery module to easily cause short circuit;

another way is to weld the battery post to the conductive tab. The conductive connecting sheet is welded by ultrasonic welding, resistance welding, laser welding and the like.

For the welding of conductive tabs, the reliability of the connection and the safety of the battery are of the greatest concern to the manufacturer.

In the prior art, the welded poles of the battery are arranged on a plane, and the welding spot areas of the conductive connecting sheets are also arranged on a plane, but due to the assembly process and the dimensional tolerance of the components, the pole welding surface of the battery core is not exactly on a plane, at some welding spots, the conductive connecting sheets and the battery pole welding surface are at a distance, and the distance between the conductive connecting sheets and the poles, which can be effectively welded by the laser welder, is limited.

In order to reduce the influence of the gap between the conductive connecting sheet and the cell post on the welding quality, there are some tools for pressing the conductive connecting sheet to the cell post in the prior art, for example, patent document 201710316090.9 discloses a device for pressing contact surfaces at different positions by means of spring contacts.

However, in the prior art, the compressed area is not a welding point, so that the tight contact between the conductive connecting sheet and the cell pole column during welding cannot be ensured, and the welding area and the quality are not visible. Therefore, in the prior art, a large amount of poor welding such as cold joint, false welding, oxidation and the like cannot be avoided, and quality and potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a power battery module busbar, its purpose improves battery module busbar and electric core utmost point post welding quality.

In order to realize the purpose, the utility model discloses the technical scheme who takes does:

the utility model discloses a power battery module busbar, for the electrically conductive connection piece of stratiform composite metal material, electrically conductive connection piece on the laser welding region be equipped with the aperture.

The small holes are arranged inside the area surrounded by the laser welding points and are close to the laser welding points.

The number of the small holes is more than two.

In order to realize the same purpose of the invention as the technical scheme, the utility model also provides a welding method of the power battery module busbar, its technical scheme is:

the welding method comprises the following steps:

step one, arranging six battery cores according to a design mode;

placing two end plates at two ends of the battery core arrangement, and welding the side panel of the module with the end plates under set pressure;

thirdly, placing the top plastic support at the top end of the battery module according to the designed position;

fourthly, placing the bus bars according to the designed positions;

using a tool, lightly hammering the conductive connecting sheet above each pole to be attached to the poles;

compressing the periphery of the opening of the conductive connecting sheet by using a clamping tool to enable the busbar to be tightly attached to the pole;

step seven, according to the set process, using laser welding to firmly weld the conductive connecting sheet and the battery cell pole;

and then subsequent processing is performed.

And the tool in the fifth step is a bakelite block.

The above technical scheme is adopted in the utility model, make electrically conductive connection piece laser welding spot surround regional trompil, make the solder joint visual, welding quality is visual promptly, reduces trouble and hidden danger, and then improves battery module busbar and electric core utmost point post welding quality.

Drawings

The contents of the drawings and the reference numbers in the drawings are briefly described as follows:

fig. 1 is a schematic structural view of a screw connection conductive sheet of the present invention;

FIG. 2 is a schematic view of the position relationship between the openings and the solder joints on the conductive sheet of the present invention;

FIG. 3 is a schematic view showing the positional relationship between a plurality of openings and solder joints on the conductive sheet of the present invention;

fig. 4 is a schematic diagram of the relative positions of the battery core and the bus bar of the present invention;

fig. 5 is a schematic structural view of the battery module of the present invention;

fig. 6 is a schematic top view structure of the present invention;

fig. 7 is a schematic diagram of the relative positions of the battery cell, the bus bar, and the top plastic bracket according to the present invention.

Labeled as:

1. battery core, 2, end plate, 3, module side board, 4, top plastic support, 5, busbar, 6, utmost point post, 7, electrically conductive connection piece, 8, battery module, 9, aperture, 10, laser welding point.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention by those skilled in the art.

As shown in fig. 1 to 7, the bus bar of the present invention is a power battery module bus bar, which is a conductive connection sheet 7 made of a laminated composite metal material.

In order to and overcome prior art's problem, defect, realize improving battery module busbar and electric core utmost point post welding quality's invention purpose, the utility model discloses the technical scheme who takes does:

as shown in fig. 2 and 3, the bus bar of the power battery module of the present invention has a small hole 9 in the laser welding area of the conductive connecting sheet 7.

By adopting the technical scheme, the reject ratio of welding the busbar and the electric core pole in the power battery module is reduced.

As shown in fig. 2, the small hole 9 is arranged inside the area surrounded by the laser welding spot 10 and is adjacent to the laser welding spot 10.

As shown in fig. 3, the number of the small holes 9 is two or more.

The utility model discloses a power battery module busbar is the electrically conductive connection piece of stratiform composite metal material, and the laser welding is regional to be opened there is the aperture on the electrically conductive connection piece, and the aperture is arranged in the inside of laser welding spot encirclement area, and is tightly facing the laser welding point.

As shown in fig. 2:

the shape of the opening includes, but is not limited to, round hole, square hole, hexagonal hole, triangular hole, and the number of the openings includes, but is not limited to, one, two, or more.

The utility model discloses can adopt the square crust electricity core module of 6 Ah3.6V.

the welding method comprises the following steps:

step one, arranging six battery cores 1 according to a design mode; the design mode is shown in FIG. 4;

placing two end plates 2 at two ends of the battery core arrangement, and welding the module side panel 3 and the end plates 2 under set pressure;

thirdly, placing the top plastic support 4 at the top end of the battery module 8 according to a designed position; the design position is shown in fig. 5;

fourthly, placing the bus bar 5 according to a design position, wherein the design position is shown in figure 4;

using a tool to lightly hammer the conductive connecting sheet 7 above each pole 6 so as to be attached to the pole 6;

pressing the periphery of the opening of the conductive connecting sheet 7 by using a clamping tool to enable the busbar 5 to be tightly attached to the pole 6;

step seven, according to the set process, the conductive connecting sheet 7 and the battery cell pole 6 are firmly welded by laser welding;

and then subsequent processing is performed.

And the tool in the fifth step is a bakelite block.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without modification to the method and technical solution of the present invention, or the present invention can be directly applied to other occasions without modification, all within the scope of the present invention.

Claims

1. The utility model provides a power battery module busbar, is electrically conductive connection piece (7) of stratiform composite metal material which characterized in that: the laser welding area on the conductive connecting sheet (7) is provided with a small hole (9).

2. The power cell module busbar of claim 1, wherein: the small holes (9) are arranged inside the area surrounded by the laser welding points (10) and are close to the laser welding points (10).

3. The power cell module busbar of claim 1, wherein: the number of the small holes (9) is more than two.