Lithium ion battery diaphragm and its production method

A technology for lithium-ion batteries and production methods, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of narrow and long hole shape, complicated preparation process, and low transverse strength, and achieve uniform hole shape and high air permeability , the effect of high porosity
CN1514501AInactive Publication Date: 2004-07-21XINXIANG ZHONGKE SCI&TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XINXIANG ZHONGKE SCI&TECH
Publication Date
2004-07-21
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

Characters of the invention are that crystal-nucleating agent of amide family compound is added into polyolefine resin. The procedure of the method includes following steps. (1) Under computer full control, hoisting system adds polyolefine resin containing 0.001-3% crystal-nucleating agent to extruder. In temperature 130-280 deg.C, the material is melted and extruded out. Then, primal flat film is rolled and obtained by using cooling roller to treat the material at temperature 40-110 deg.C. (2) The said primal flat film is fed into vertical and horizontal biaxial stretcher for stretch formability. Finally, heat customization is carried out. The selected crystal-nucleating agent possesses high crystal transformation ratio, and abundant source. Battery diaphragm provides features of high porosity, shapely hole shape, good intensity in both directions, and low cost. The invention can be applied to lithium cell, secondary cell or other type batteries after hydrophilic treatment.
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Description

Technical field:

[0001] The invention relates to a novel lithium-ion battery diaphragm and a production method thereof. Background technique:

[0002] Battery separator is an indispensable material in battery production. It is often made of microporous separator with good insulation performance and good gas permeability. The material used to make the diaphragm is generally polyolefin, because of its high insulation, wide temperature range, and strong hydrophobicity, it is an ideal diaphragm material for the production of lithium batteries. However, the preparation of polyolefin microporous membranes is relatively difficult. The stretching method is an economical and practical method. Because the production process does not involve solvents and is easy to industrialize, and the obtained microporous membranes have excellent mechanical properties, they are favored by people. At present, there are two methods for preparing polyolefin microporous membranes by stretching: one is ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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