Battery cell and lithium ion battery using same

Abstract

The invention relates to the field of energy storage devices, in particular to a battery cell and a lithium ion battery using the battery cell. The battery cell comprises a negative pole piece, a positive pole piece and an isolating membrane, the isolating membrane is arranged between the negative pole piece and the positive pole piece, and the negative pole piece comprises ends and anti-puncturecushion layers, wherein the ends comprise tail exposed areas; the anti-puncture cushion layers are arranged in the tail exposed areas; and the anti-puncture cushion layers correspond to the outer sides of the corners of the positive pole piece. The lithium ion battery comprises an aluminum-plastic film and the battery cell. According to the battery cell provided by the invention, the probability that the aluminum-plastic film is punctured by a positive pole current collector is greatly reduced.

Description

[0001] This application is a divisional application of the patent application with the application number 201510932576.6 and the title of the invention "cathode pole piece and lithium ion battery using the pole piece" submitted on December 14, 2015. technical field [0002] The present application relates to the field of energy storage devices, in particular to an electric core and a lithium ion battery using the electric core. Background technique [0003] With the development of science and technology, various electronic products emerge in an endless stream, almost becoming an indispensable part of daily life, and lithium-ion batteries have many advantages such as high energy density, long cycle life, environmental friendliness and reproducibility, etc. Used in various electronic products. [0004] In the related art, the isolation between the anode current collector and the aluminum-plastic film is generally achieved through an isolation film. As the market has higher an...

AI Technical Summary

Problems solved by technology

On the one hand, the puncture resistance strength of the thinned separator and polypropylene layer decreases accordingly. On the other hand, because the lithium battery anode current collector is copper foil, and the process conditions in the related technology are limited, there will be burrs on the end surface of the copper foil. Under extreme conditions, the burrs on the anode end surface may pierce the separator and the aluminum-plastic film, and the thinned anode current collector will be sharper at the corners on both sides when it is wound to form a battery cell, thus exacerbating the damage of the anode current collector. Possibility of piercing the polypropylene layer of the separator and the aluminum-plastic film

In the related art, it is difficult to ensure a good isolation effect by relying on the isolation film to isolate the anode pole piece and the aluminum-plastic film.

[0005] The polypropylene layer of the isolation film and the aluminum-plastic film is pierced, which will lead to liquid leakage, and more seriously, it will cause the anode to be in contact with the aluminum foil layer of the aluminum-plastic film. liquid and corrosion

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