Tight fitted aluminum housing and cover plate for lithium ion battery

Abstract

The invention discloses a tight fitted aluminum housing and cover plate for a lithium ion battery, which comprises an aluminum housing and a cover plate, wherein grooves are formed at four corner angles on the inner side of the aluminum housing; bulges are arranged at four chamfers of the cover plate; the bulges and the grooves are in antiparallelogram straight rectangular pyramid frustum structures; and the bulges are fitted with the grooves. The aluminum housing and cover plate has the advantages that the aluminum housing and cover plate is lower in cost and simple in structure; the grooves at the corner angles on the inner side of the aluminum housing are fitted with the bulges at the corner angles of the chamfers of the cover plate; contact area and a stress direction of the aluminum housing and the cover plate are increased; a fit degree between the aluminum housing and the cover plate is increased; a welding yield of the aluminum housing and the cover plate is increased; the material cost is lowered; and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum shells for lithium-ion batteries, in particular to a tight-fit aluminum shell and cover plate for lithium-ion batteries. Background technique [0002] With people's continuous pursuit of new energy fields, lithium-ion batteries have developed rapidly. The lithium-ion batteries that appear on the market today can be divided into circular lithium-ion batteries, square lithium-ion batteries and soft-pack lithium-ion batteries according to their outer packaging. Since the square lithium-ion battery has a square structure, the contact surface between the aluminum case and the cover plate is square. [0003] The square shape means that the contact points between the aluminum shell and the cover must be angular, and the existence of edges and corners affects the fit between the aluminum shell and the cover to a certain extent. As for the round battery, because the contact surface between the aluminum ...

AI Technical Summary

Problems solved by technology

Once the cover plate and the aluminum shell are not well matched, when the cover plate and the aluminum shell are laser welded together, poor welding such as weld seams and welding deviations will occur.

This not only caused a waste of raw materials, but also affected the normal circulation of the production line, resulting in immeasurable losses

[0004] At present, the common tight fit method between the cover plate and the aluminum shell is the fit between the chamfer of the cover plate and the aluminum shell. Although this can improve the fit between the cover plate and the aluminum shell by reducing the tolerance, there are still certain defects in the straight line fit. Either the fit is not enough and the cover is easy to fall off, or the fit is too tight and the cover cannot be closed

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