Lithium ion battery diaphragm 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 longitudinal and transverse strength

Inactive Publication Date: 2005-12-21
XINXIANG ZHONGKE SCI&TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

However, the disadvantage of this diaphragm is that the transverse strength is extremely low, the hole shape is long and narrow, and the preparation process is complicated, which limits its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] When other conditions are constant, the higher the crystalline form K value content of the original flat film, the more conducive to the formation of micropores, and the lower cooling rate can increase the crystalline form content. For this reason, the extrusion speed, traction speed and cooling roll speed can be adjusted so that the original flat film has enough cooling time, usually within 30 minutes.

[0008] The original flat film with high crystallization content coming out of the cooling roll directly enters the longitudinal stretching machine and the horizontal stretching machine, and the stretching speed is adjusted according to the stretching temperature. Generally, the stretching speeds in two mutually perpendicular directions can be the same or slightly different. The stretching speed has little effect on the micropores, but has a great influence on the stretched film formation. The unidirectional stretching speed adopted in the present invention is 0...

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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.

Description

Technical field: [0001] The invention relates to a production method of a lithium-ion battery diaphragm. 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 to first form c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08J9/00H01M2/16
CPCY02E60/10
Inventor 徐亮王向东杨书廷
Owner XINXIANG ZHONGKE SCI&TECH
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