Tab and battery comprising same

Abstract

The invention discloses a tab and a preparation method thereof and a battery comprising the tab. The tab is a copper foil material, one surface of the copper foil material, which has large pressure stress, is an S surface, one surface of the copper foil material, which has small pressure stress, is an M surface, and the M surface is provided with indentations or reinforcing ribs. According to thetab disclosed by the invention, the indentation or the reinforcing rib is arranged on the M surface of the copper foil material, so that the residual stress (mainly the pressure stress of the S surface) is counteracted, meanwhile, the rigidity of the tab can be improved by arranging the indentation or the reinforcing rib, the non-deformability is improved, and the subsequent tab is prevented frombeing turned over and warped. According to the preparation method of the tab, the S surface / M surface of the copper foil material is identified, the incoming material direction, namely the M surface direction, is ensured to be outward (or inward), and the winding and unwinding direction of each process and the mounting direction of the embossing device are reasonably cured, so that the tab of theproduct is embossed and pressed on the M surface of the copper foil material instead of the S surface or double surfaces.

Description

Technical field [0001] The invention belongs to the field of chemical power sources, and specifically relates to a tab for a battery and a battery containing the tab. Background technique [0002] Electrolytic copper foil is used as the negative electrode current collector, and the thickness is generally 4-8μm. For this kind of ultra-thin copper foil, the rigidity of the foil itself is low. After die-cutting, the tabs are easily turned over due to residual internal stress and external force. Folding and warping corners affect product quality and cause short circuit risks. [0003] Although the double-sided embossing of the tab with the tab stiffener device used in the industry can enhance the strength of the tab and improve the folding and warping, some products still have the problem of tab folding. In order to reduce the folding ratio of the tabs, some companies emboss the tabs on both sides asynchronously, which has the problem of fracturing of the tabs. Summary of the inventi...

AI Technical Summary

Problems solved by technology

In order to reduce the folding ratio of the tabs, some companies emboss both sides of the tabs asynchronously, and there is a problem of tab fracturing

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