Cylindrical lithium ion battery and processing method thereof

Abstract

The invention discloses a cylindrical lithium ion battery and a processing method thereof, which can solve the technical problems that because space inside an existing lithium battery is reduced, battery liquid injection is difficult and a certain safety risk exists. The cylindrical lithium ion battery comprises a roll core, a shell and current collecting discs, wherein the height of the roll coreis smaller than that of the shell; the shell is cylindrical; the roll core is located inside the shell; tabs are arranged at the two ends of the roll core; one end of the roll core is provided with the positive tab, and the other end of the roll core is provided with the negative tab; the end surfaces of the tabs of the roll core are annular step surfaces; annular grooves are formed in the current collecting discs of positive and negative electrodes; the grooves are welding areas; the annular step surfaces on the tabs are welded with the annular grooves in the current collecting discs in a fitted manner; and a set spacing is reserved between the head and the tail of a welding track during welding. Compared with the prior art, the cylindrical lithium ion battery has the advantages that theshort circuit rate can be effectively reduced; the length of each tab is reduced, so that the weight of the battery is reduced and the liquid injection space of electrolyte is expanded; and by adopting an annular welding mode, the welding efficiency is improved compared with other multi-track welding modes.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion cylindrical battery and a processing method thereof. Background technique [0002] Lithium batteries have the advantages of small size, large capacity, long service life, low self-discharge rate, no memory effect, and environmental protection. They are currently widely used in commercial vehicles, special vehicles, electric bicycles, energy storage systems, and medical equipment. At present, under the condition of a certain size of the battery, with the increase of the battery capacity, the space inside the battery is reduced, which makes it difficult to inject liquid into the battery, and there are certain safety risks. [0003] The problem that concrete prior art exists is as follows: [0004] ①The traditional method adopts the full tab method for flattening welding. During the flattening process, the tab is easy to pierce the insulating film and ca...

AI Technical Summary

Problems solved by technology

[0006] A lithium-ion cylindrical battery and its processing method proposed by the present invention can solve the technical problems that the existing lithium battery has less internal space, which leads to difficulty in battery injection and certain safety risks

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