阅读说明：本技术 一种软包锂离子电池极耳连接件及连接方法 (Soft package lithium ion battery tab connecting piece and connecting method ) 是由 佘沛亮 于 2020-12-21 设计创作，主要内容包括：本发明适用于锂离子电池技术领域,提供了一种软包锂离子电池极耳连接件及连接方法,连接件包括连接带和连接片,沿连接带的长度方向的表面连接有多个连接片,连接片成对设置,每对连接片包括一子连接片和一母连接片,子连接片和母连接片的一边连接且该边与连接带的表面连接,沿子连接片的另一边设置有多个凸台,沿母连接片的另一边设置有多个第一圆孔,第一圆孔的直径略小于凸台的前端直径。本发明通过连接件与极耳压接固定,连接件具有占用空间小、重量轻的优点,连接件与极耳的连接牢固,可靠性好,在使用过程中不会松动,采用该连接件制作软包锂离子电池模块不需要外框架固定每一个单体电芯,只需要固定整体模块即可,能够有效提高生产效率。(The invention is suitable for the technical field of lithium ion batteries, and provides a soft-package lithium ion battery tab connecting piece and a connecting method. The connecting piece is fixedly connected with the lug in a compression joint mode, the connecting piece has the advantages of small occupied space and light weight, the connecting piece is firmly connected with the lug, the reliability is good, and the connecting piece cannot be loosened in the using process.)

1. The utility model provides a soft packet of lithium ion battery utmost point ear connecting piece, its characterized in that includes connecting band and connection piece, follows the length direction's of connecting band surface is connected with a plurality of connection pieces, the connection piece sets up in pairs, and every includes a subconnector piece and a female connection piece to the connection piece, one side of subconnector piece and female connection piece is connected and this limit with the surface connection of connecting band follows the another side of subconnector piece is provided with a plurality of bosss, follows the another side of female connection piece is provided with a plurality of first round holes, the diameter of first round hole slightly is less than the front end diameter of boss.

2. The soft-package lithium ion battery tab connector as claimed in claim 1, wherein the connecting band is made of copper, aluminum or copper aluminum alloy.

3. The soft-package lithium ion battery tab connector as claimed in claim 2, wherein the connecting sheet is made of copper, aluminum or copper aluminum alloy.

4. The soft-package lithium ion battery tab connecting piece according to claim 1, wherein the connecting band and the connecting piece are welded by laser or riveted by machinery.

5. A method for connecting a soft package lithium ion battery tab is characterized in that the tab connecting piece of any one of claims 1-4 is used, and comprises the following steps:

a plurality of second round holes are formed in the length direction of the lug, and the diameter of each second round hole is slightly smaller than that of the front end of the boss;

penetrating the boss on the sub-connecting piece through the second round hole and performing interference fit with the second round hole;

the front end of the boss penetrating through the second round hole penetrates through the first round hole in the female connecting piece and is in interference fit with the first round hole;

and the boss and the first round hole are fixed in a compression joint mode.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a soft-package lithium ion battery tab connecting piece and a connecting method.

Background

Soft package lithium ion battery obtains a large amount of applications in electric automobile and electric power energy storage field because light in weight, size are easily changed, but because its casing is softer, often need a large amount of auxiliary support materials can guarantee the performance's of its performance when battery packing, encapsulation and assembly. In addition, soft packet of lithium ion battery's utmost point ear connected mode is including adopting the switching aluminium nickel utmost point ear to weld on the copper bar firmly, through the bolt fastening on the copper bar firmly, adopts and moulds the frame structure with utmost point ear welding at moulding the frame top, perhaps, packs into electric core and welds utmost point post again in aluminium hull or the steel casing, but these modes all can bring a lot of troubles, not only production efficiency is low, it is not hard up easily, the reliability is poor, and weight is big moreover, occupation space is many.

Patent "a soft package lithium ion battery module for electric motor car" with application number CN201410386319.2 adopts two at least soft package lithium ion battery unit along vertical direction superpose and pass through fastening bolt fixed mounting between bottom plate and upper cover, constitutes soft package lithium ion battery module, nevertheless can increase the whole weight of module.

Patent "soft packet of lithium ion battery module and electric automobile" with application number CN201810142053.5 installs the clamp plate on utmost point ear, and the clamp plate compresses tightly busbar and utmost point ear through the bolt, but bolted connection mode is not hard up because of the vibration easily in long-term use, and then brings the potential safety hazard.

Disclosure of Invention

The invention provides a soft package lithium ion battery tab connecting piece and a connecting method, and aims to solve the technical problem.

The invention is realized in such a way that the soft package lithium ion battery tab connecting piece comprises a connecting band and connecting pieces, wherein a plurality of connecting pieces are connected to the surface of the connecting band along the length direction, the connecting pieces are arranged in pairs, each pair of connecting pieces comprises a sub-connecting piece and a main connecting piece, one side of the sub-connecting piece is connected with one side of the main connecting piece, the side of the sub-connecting piece is connected with the surface of the connecting band, a plurality of bosses are arranged along the other side of the sub-connecting piece, a plurality of first round holes are arranged along the other side of the main connecting piece, and the diameter of each first round hole is slightly smaller than the diameter of.

Further, the connecting band is made of copper, aluminum or copper aluminum alloy.

Furthermore, the connecting sheet is made of copper, aluminum or copper-aluminum alloy.

Furthermore, the connecting belt and the connecting sheet are welded by laser or riveted by machinery.

The invention also provides a soft package lithium ion battery tab connecting method, which uses the tab connecting piece and comprises the following steps:

a plurality of second round holes are formed in the length direction of the lug, and the diameter of each second round hole is slightly smaller than that of the front end of the boss;

penetrating the boss on the sub-connecting piece through the second round hole and performing interference fit with the second round hole;

the front end of the boss penetrating through the second round hole penetrates through the first round hole in the female connecting piece and is in interference fit with the first round hole;

and the boss and the first round hole are fixed in a compression joint mode.

The soft package lithium ion battery tab connecting piece and the connecting method provided by the invention are fixed with the tab in a compression joint mode through the connecting piece, the connecting piece has the advantages of small occupied space and light weight, the connecting piece and the tab are firmly connected, the reliability is good, and the connecting piece cannot be loosened in the using process.

Drawings

Fig. 1 is a schematic structural diagram of a soft package lithium ion battery tab connector provided in an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating connection and crimping of a soft-package lithium ion battery tab connector and a tab provided by an embodiment of the present invention;

fig. 3 is a flowchart of a method for connecting a tab of a soft-package lithium ion battery according to an embodiment of the present invention.

The reference numbers in the figures denote: 1-pole lug, 2-connecting band, 3-sub-connecting band, 4-mother connecting band, 5-lug boss, 6-first round hole, 7-second round hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-2, the embodiment of the invention provides a soft-package lithium ion battery tab connecting piece, which comprises a connecting band 2 and a connecting piece. The connecting band 2 is a strip-shaped rectangular structure, the connecting piece is a sheet-shaped rectangular structure, the material of the connecting band 2 can be copper, aluminum or copper-aluminum alloy, and correspondingly, the material of the connecting piece is copper, aluminum or copper-aluminum alloy.

The surface along the length direction of connecting band 2 is connected with a plurality of connection pieces, and the connection piece sets up in pairs. The connecting position of the connecting sheet on the connecting belt 2 is determined according to the cell thickness of the soft-package lithium ion battery, and the connecting sheet can clamp the tab 1 on two sides of the tab 1.

Each pair of connecting pieces comprises a sub-connecting piece 3 and a main connecting piece 4, one side of the sub-connecting piece 3 and one side of the main connecting piece 4 are connected, and the side is connected with the surface of the connecting belt 2. The connecting process of the connecting band 2 and the connecting piece can adopt laser welding or mechanical riveting.

Be provided with a plurality of bosss 5 along the another side of sub-connection piece 3, be provided with a plurality of first round holes 6 along the another side of female connection piece 4, the diameter of first round hole 6 slightly is less than the front end diameter of boss 5. Boss 5 at the front end of sub-connecting piece 3 and first round hole 6 interference fit at the front end of main connecting piece 4, boss 5 passes first round hole 6, can realize stable connection, and follow-up mode of reusing crimping to fix is pressed from both sides utmost point ear 1 tight fixedly.

Referring to fig. 3, an embodiment of the present invention provides a method for connecting a tab of a soft-package lithium ion battery, where the method for connecting the tab of the soft-package lithium ion battery includes:

s1: a plurality of second round holes 7 are formed along the length direction of the lug 1, and the diameter of each second round hole 7 is slightly smaller than the diameter of the front end of the boss 5.

The round hole is also opened to utmost point ear 1, and the diameter of second round hole 7 slightly is less than the front end diameter of boss 1, and the boss 1 of being convenient for passes second round hole 7 and with second round hole 7 interference fit.

S2: and the boss 5 on the sub-connecting piece 3 passes through the second round hole 7 and is in interference fit with the second round hole 7.

S3: the front end of the boss 5 passing through the second round hole 7 passes through the first round hole 6 on the female connecting piece 4 and is in interference fit with the first round hole 6.

S4: the fixed boss 5 and the first round hole 6 are pressed and connected.

After the lug boss 5 passes through the second round hole 7 on the lug 1 and the first round hole 6 on the female connecting piece 4, the male connecting piece 3, the lug 1 and the female connecting piece 4 are fixedly connected in a compression joint mode.

In conclusion, the soft-package lithium ion battery tab connecting piece and the connecting method provided by the invention are fixed with the tab in a compression joint mode through the connecting piece, the connecting piece has the advantages of small occupied space and light weight, the connecting piece and the tab are firmly connected, the reliability is good, the connecting piece cannot loosen in the using process, each single battery cell does not need to be fixed by an outer frame when the connecting piece is used for manufacturing a soft-package lithium ion battery module, only the whole module needs to be fixed, and the production efficiency can be effectively improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.