Cylindrical battery and manufacturing method thereof

Abstract

The invention discloses a cylindrical battery and a manufacturing method thereof, which relate to the field of lithium ion battery manufacturing. The structure is simple. The height of a roll core canbe reduced to a certain extent by arranging a tab on one end surface of the roll core, and meanwhile, only one end of a shell can be opened and sealed, so that the overall weight of the cylindrical battery is reduced; according to the manufacturing method of the cylindrical battery, compared with a pole piece using full tabs in the prior art, the laser cutting of the pole piece is additionally arranged on the process, and through the cooperation of the laser cutting and the subsequent welding and kneading process of the tabs, a positive tab area, a negative tab area and a non-tab area can beformed at one end of a roll core formed by winding a positive plate and a negative plate, and a non-welding area between tabs is omitted, so that the contact compactness between the positive tab and the negative tab after winding is reduced, and the speed of infiltrating the positive plate and the negative plate by electrolyte can be increased during subsequent injection of the electrolyte; and the production efficiency of the cylindrical battery is effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a cylindrical battery and a manufacturing 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] At present, cylindrical batteries generally adopt the method of having positive and negative tabs at both ends, and at the same time, the positive and negative tabs are in the shape of continuous and uninterrupted strips. The connec...

AI Technical Summary

Problems solved by technology

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] At present, cylindrical batteries generally adopt the method of having positive and negative tabs at both ends. At the same time, the positive and negative tabs are continuous and long strips. After the positive and negative electrodes are wound and formed and the tabs are flattened, the The connection between them is very dense, and it is difficult for the electrolyte to infiltrate the positive and negative plates. At the same time, the method of tabs at both ends makes the core height too high and the battery density is relatively low.

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