A coiling lithium secondary battery

A lithium secondary battery, wound-type technology, applied in the high-energy field, can solve problems such as short circuit of positive and negative electrodes, hidden dangers of battery safety, short circuit of battery, etc., to prevent powder drop, improve battery yield rate, and avoid internal micro short circuit of battery Effect

Inactive Publication Date: 2008-03-26
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 p

Method used

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  • A coiling lithium secondary battery

Examples

Experimental program
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Effect test

Example Embodiment

[0013] Example 1

[0014] A wound lithium secondary battery includes a casing, a battery core winding body and electrolyte contained in the casing. As shown in Figure 1, the battery core winding body is wound by the positive electrode sheet 20, the separator 21 and the negative electrode sheet 22. The inner side of the positive electrode sheet at the bend of the battery core body has a width of 2mm, and the length is equal to the width of the positive electrode sheet. The area is not coated with the active material layer 200, and the present invention can be understood more clearly through the enlarged view at A in FIG. 1 and FIG. 2.

Example Embodiment

[0015] Example 2

[0016] This embodiment is basically the same as Embodiment 1, except that the width of the uncoated active material layer is 1.5 mm.

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M10/40H01M4/13H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王春光陈保同任灿
Owner SHENZHEN BAK BATTERY CO LTD
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