Top cover, assembling method thereof and square-shell battery cell

Abstract

The invention relates to a top cover, an assembling method thereof and a square-shell battery cell. The top cover comprises: a cover plate which is provided with a positive pole column mounting hole, a negative pole column mounting hole and an explosion-proof sheet mounting hole; a positive pole column and a negative pole column which are respectively arranged on the positive pole column mounting hole and the negative pole column mounting hole through a positive pole upper plastic sleeve and a negative pole upper plastic sleeve and are higher than the upper surface of the cover plate by a preset height; an explosion-proof sheet which is mounted on the explosion-proof sheet mounting hole; a lower plastic plate which is attached to the lower surface of the cover plate and is provided with a first through hole and a second through hole which are respectively aligned with the positive pole column mounting hole and the negative pole column mounting hole, and a pressure relief channel which is aligned with the explosion-proof sheet mounting hole; and a positive pole adapter plate and a negative pole adapter plate which are respectively provided with a first bulge and a second bulge which respectively penetrate through the first through hole and the second through hole to be connected to the positive pole column and the negative pole column. The top cover is simple in structure, low in cost, high in grouping assembly efficiency, small in welding resistance and good in stability.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a top cover, an assembly method thereof, and a square shell battery cell. Background technique [0002] The current lithium battery new energy market is developing rapidly. Lithium batteries on the market are mainly square-shell batteries, cylindrical batteries and soft-pack batteries. Among them, the market share of square-shell batteries is the largest, and the structural strength of square-shell batteries is strong. The grouping efficiency is high, and it is extremely advantageous as a lithium ion battery cell structure. A square shell cell is usually composed of a shell, a top cover and a cell module. Traditional square shell batteries mainly have the following problems: [0003] 1. The poles of the traditional square-shell batteries are bolt structures, the structure is complex, the efficiency of group assembly is low, and the contact resistance is large; [0004]...

AI Technical Summary

Problems solved by technology

[0003] 1. The poles of the traditional square-shell batteries are bolt structures, the structure is complex, the efficiency of group assembly is low, and the contact resistance is large;

[0004] 2. The airtightness and durability of the pole of the traditional square shell cell are not good, and the guarantee of airtightness is very important for the safety of lithium-ion batteries;

[0005] 3. The lower plastic and adapter piece inside the traditional top cover take up a lot of space;

[0006] 4. The poles of the traditional top cover are high and occupy a large space. In the assembly of battery modules, they usually occupy a large space on the top of the mold, resulting in problems such as low efficiency of module assembly.

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