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
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[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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