Cells and lithium-ion batteries using cells

Abstract

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. The cell includes a cathode pole piece, an anode pole piece and a separator, the separator is arranged between the cathode pole piece and the anode pole piece, the cathode pole piece includes an end and a puncture-proof pad, wherein The end portion includes a tail exposed area; the anti-puncture pad layer is arranged on the exposed tail area; and the anti-puncture pad layer corresponds to the outside of the corner of the anode pole piece. The lithium-ion battery includes an aluminum-plastic film and the electric core. The electric core provided by the present application greatly reduces the probability that the aluminum-plastic film is pierced by the anode current collector.

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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