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Cold connection method of hard-shell lithium battery pole and connecting piece

A lithium battery and connecting piece technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of high risk of welding slag, difficult to detect over-welding, high welding cost, increase the contact area, easy to rework, Avoid costly effects of welding

Active Publication Date: 2021-08-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the sake of product quality, the tension detection function needs to be turned on, but this function will reduce productivity after it is turned on
In addition, laser welding also has problems such as over-welding is difficult to detect, welding slag is highly dangerous, and welding costs are high.

Method used

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  • Cold connection method of hard-shell lithium battery pole and connecting piece
  • Cold connection method of hard-shell lithium battery pole and connecting piece
  • Cold connection method of hard-shell lithium battery pole and connecting piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The following steps of the hard-shell lithium battery pole column and the connecting sheet of the present embodiment are introduced in the following series, including the following steps:

[0048] S1, provides a material, including at least two square lithium battery metal housings 1 and a metal connecting piece 3, including a tab body 31 and two cladding portion 32;

[0049] S2, set the two-square lithium battery metal casing 1 and then arranged in parallel, the two poles 29 (respectively, the positive electrode and the negative electrode) on the two metal casings 1 are arranged in a straight line, and the two embedded grooves 320 on the metal connection sheet 3 are embedded. The polar pillar 2 on the adjacent two metal casings 1, before the pole column 2, the rear two connecting surface 20 relative to the inner side wall of the embedded groove 320; in the present embodiment, the pole column 2, then A transition cooperation between the two connecting surfaces 20 and the in...

Embodiment 2

[0058] With the embodiment of the present embodiment, although the projection 421 extrudes the first curved portion 321 and the third bending portion 323 and the recess, the depressed portion will rub with the surface of the pole 2, remove the surface surface. The oxide layer prevents the first bending portion 321 and the third bending portion 323 and the pole column 2 after the connection is not turned on. However, the inventors still worry about the aluminum alloy material or the electrode 2 and the metal connection sheet 3 contact with the metal connection sheet 3, and the connection is not turned on when the connection is completed. Therefore, the second embodiment has been further improved on the basis of the first embodiment, and the specific improvements are as follows:

[0059] The pole column 2 is simultaneously with the metal connection sheet 3, or the copper material is used simultaneously; when the aluminum alloy is used, first use the weak acid treatment pole 2 2, the...

Embodiment 3

[0062] According to the embodiment of the present embodiment, by the extrusion of the projection 421, the first bending portion 321 and the third bending portion 323 and the pole column 2 are rotated, but the inventors have a polar column 2 and a metal. The electrical conductivity of the connecting piece 3 still has doubts, especially in consideration of the hard shell lithium battery commonly used for the in-vehicle environment, and long-term bumps and vibrations may result in poor contact with the metal connection sheet 3. Therefore, the third embodiment has made further improvements on the basis of the first example, and the specific improvements are as follows:

[0063] In the S2, the square lithium battery metal casing 1 is arranged in parallel, and the pole column 2 on each metal casing 1 is arranged to be a straight line; and then the solder sheet 5 is provided on the front two joint surface 20 before the pole column 2. Finally, the embedded groove 320 on the metal connecti...

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Abstract

The invention provides a cold connection method of a hard-shell lithium battery pole and a connecting piece; through a cold connection structure formed by inserting the battery pole and the connecting piece, quick insertion type production of a battery module is realized, and the efficiency is higher; the pole and the connecting piece of the battery are fastened in an extrusion manner, so that reliable connection and reliable electric conduction of the pole and the connecting piece are ensured; the problems of high welding cost, complex welding process, difficulty in detection of welding defects, difficulty in elimination of welding slag pollution and the like caused by thermal connection modes such as traditional laser welding are avoided; and the heat dissipation effect of the battery module in use is improved by increasing the contact area of the battery pole and the connecting piece. By adopting different positive and negative electrode plugging structures, positive and negative electrode fool-proof is realized, and the production safety is improved; according to the method, reworking is easy, the cost is reduced, and during reworking, the horizontal part of the connecting piece is cut off or snipped off along the battery pole, and then a new connecting piece is taken to compress and overlap again; and the method is particularly suitable for a lithium battery under the condition of large cell and large current.

Description

Technical field [0001] The present invention relates to a lithium battery, and more particularly relates to a method for the cold connection with the hard lithium pole connecting piece. Background technique [0002] Lithium batteries because of its high energy density and lower cost of production, is the most common business applications for sustainable energy storage battery. Within a single box containing lithium tens, hundreds or even thousands of unit cells, if the cells directly together in series and parallel, neither convenient assembly manufacturing, maintenance of late nor benefit. Thus, under normal circumstances, a battery case contains several modules, a different number of modules of different specifications can be composed of a battery case, to facilitate mass production, modular manufacturing. Generally refers to the cell module by way of the series and parallel, through the insulating spacer module structure and fixed member, matched with a battery cell assembly f...

Claims

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Application Information

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IPC IPC(8): H01M50/514H01M50/517H01M50/528
CPCY02E60/10
Inventor 朱国荣杨双成吴瓯凯王菁邓翔天康健强熊松
Owner WUHAN UNIV OF TECH