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Electric core, electrochemical device and manufacturing method thereof

An electrochemical and battery technology, applied in the manufacture of electrolyte batteries, electrochemical generators, secondary batteries, etc., can solve the problems of positive and negative contact short circuit, edge wrinkling and deformation of the diaphragm, etc., to avoid contact short circuit, Overall enhancement, not easy to loose effect

Active Publication Date: 2019-06-07
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the falling process, the edge of the diaphragm will be wrinkled and deformed, and it will shrink into the gap between the positive and negative electrodes, resulting in a short circuit between the positive and negative electrodes.

Method used

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  • Electric core, electrochemical device and manufacturing method thereof
  • Electric core, electrochemical device and manufacturing method thereof
  • Electric core, electrochemical device and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] refer to figure 2 The electric core 1 is obtained by winding or stacking, the positive electrode sheets 5 and the negative electrode sheets 3 are alternately arranged, and both ends of the positive electrode sheets are 0.2-1mm beyond the negative electrode sheets. A separator 4 made of polyolefin material is included between the two pole pieces, and both ends of the membrane 4 protrude from the positive pole piece by 0.2-2 mm. The adhesive film 6 is cut into long and thin strips, the length is close to but not exceeding the width of the battery cell 1 , and the width is close to but not exceeding the thickness of the battery cell 1 . Adhesive film 6 is pasted on both ends of the battery cell 1 by manual operation or automatic equipment, and is in direct contact with the edge of the diaphragm exposed at the end. The position of the adhesive film 6 needs to be controlled more accurately, and try not to exceed the area range of the cell end face. Before pasting the adhe...

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PUM

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Abstract

The invention provides an electric core, which comprises a negative pole piece, a positive pole piece, a diaphragm, an end part and an adhesive film, wherein the diaphragm is arranged between the negative pole piece and the positive pole piece; the diaphragm has an extension part exceeding the negative pole piece and the positive pole piece at the end part; and the adhesive film has a main body adhered to the end part and a connecting part extending from the main body, and the connecting part is adhered with the extension part. The invention aims to provide an electric core which can effectively eliminate the short circuit failure caused by diaphragm shrinkage. The invention further provides an electrochemical device and a method of manufacturing the electrochemical device.

Description

technical field [0001] The present application relates to the field of batteries, and more specifically, to a battery cell, an electrochemical device and a method for manufacturing a lithium battery. Background technique [0002] Secondary batteries have the advantages of high energy density, long cycle life, high energy efficiency, small self-discharge, no memory effect, and no pollution. The solution to the safety problem of secondary batteries is the prerequisite for the wide application of secondary batteries. At present, secondary batteries still have certain safety risks, and the safety of secondary batteries has become a key factor restricting its further development. [0003] Separator shrinkage is an important factor restricting battery drop performance due to its characteristics of easy occurrence and high short-circuit hazard. According to the general secondary battery structure, the battery cell mainly includes three parts, the positive electrode sheet, the sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/052H01M10/04H01M10/42
CPCH01M10/0431H01M10/0587H01M10/052H01M10/0585Y02E60/10Y02P70/50
Inventor 崔厚磊肖质文焦伟民林国罗
Owner NINGDE AMPEREX TECH
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