A coiling lithium secondary battery

Abstract

This invention discloses a winded Li-secondary cell including a shell and a core winder and electrolyte in the shell, in which, the winder is formed by winding positive pole plates, membranes and negative pole plates characterizing in not coating active substance inside of the pole plates at the bending place of the winder to prevent fall off of powder so as to avoid micro-short-circuit in the cell caused by fall off active substance breaking the membrane and increase the quality.

Description

technical field [0001] The invention relates to the field of high-energy technology, in particular to a winding lithium secondary battery. Background technique [0002] Since the concept of "rocking chair battery" (RCB) was proposed in 1980, Japan's Sony Corporation and Sanyo Corporation began practical research on lithium-ion secondary batteries in 1985 and 1988, respectively. With outstanding features such as large specific energy, small self-discharge, wide application temperature range, stable working voltage, and long storage life, all countries in the world are paying attention to the application of lithium-ion secondary batteries in the field of communications, portable electronic products, electric vehicles, and aerospace. The applications showed great interest and enthusiasm, and the performance and manufacturing process of lithium-ion secondary batteries were continuously explored and improved. [0003] At present, most lithium-ion secondary batteries adopt a wind...

AI Technical Summary

Problems solved by technology

Powder falling off the pole pieces can easily cause a micro-short circuit of the battery. In severe cases, the dust can pierce the diaphragm and short-circuit the positive and negative pole pieces, causing a major safety hazard to the battery.

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