Lithium battery cap, manufacturing method and lithium battery

Abstract

The invention discloses a lithium battery block, a manufacturing method and a lithium battery. The lithium battery block comprises a block body which comprises a substrate and a step, wherein the substrate is provided with an upper surface and a lower surface, and the step integrally extends downwards from the lower surface of the substrate; the step is provided with a first side face and further comprises two integrally formed bosses which are punched on the lower surface of the step; and the bosses are provided with second side faces, and the first side face is joined with the second side faces. By punching the bosses, the fitting area of the block and a lithium battery shell is increased, and then the friction between the block and the shell is increased; and in addition, since the boss is formed by punching, i.e., the height of the step is increased, and an intilted angle can be formed on the block conveniently, the space between front parts of two bosses is reduced, the two bosses can extend into the shell easily, therefore, the qualified margin of tolerance of the inner size of the shell can be widened, the manufacturing difficulty is reduced and the assembling of the shell is more convenient.

Description

technical field [0001] The invention relates to a lithium battery cap and a lithium battery. Background technique [0002] There are two types of aluminum shell lithium batteries, square and cylindrical, and square batteries are divided into rounded squares and right-angled squares. Lithium battery includes aluminum casing, cap, winding core and electrolyte. The cap includes a cover body, rivets, connecting pieces and upper and lower sealing rings. The cover body is provided with a liquid injection hole and a rivet hole. The flat surface of the rivet is pressed against the upper sealing ring, and the nail part of the rivet passes through the upper sealing ring, the cover body and the lower sealing ring. And the connecting piece is riveted and fastened. In order to cooperate well with the aluminum shell, the cover body has a step, and the step extends into the inner surface of the aluminum shell, and the step and the inner surface of the aluminum shell are in tight fit. In...

AI Technical Summary

Problems solved by technology

In actual manufacturing, the manufacturing accuracy of the inner dimensions of the aluminum shell is very high. If the inner size of the aluminum shell is slightly larger, the fit between the steps and the aluminum shell will be too loose, which is unqualified; Unqualified, the qualified tolerance range for the inner dimensions of the aluminum shell is very small, which brings a lot of trouble to the battery manufacturing

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