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Porous film and manufacturing method thereof

A manufacturing method and porous membrane technology, applied in chemical instruments and methods, lamination, electrical components, etc., can solve the problems of high temperature melting resistance of isolation membranes and low temperature closed cells, etc.

Active Publication Date: 2012-10-03
BENQ MATERIALS WUHU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current lithium-ion battery is composed of four major materials: positive electrode material, negative electrode material, electrolyte, and separator. The requirements for the separator are as follows: electrical insulation, and through holes that can provide ion transmission. , solvent corrosion resistance, mechanical strength, high-temperature dimensional stability, high-temperature melting resistance and low-temperature closed-cell characteristics; and the single-layer structure isolation film cannot have both high-temperature melting resistance and low-temperature closed-cell characteristics, so it must Use a multi-layer structure of the isolation film to achieve the purpose of both

Method used

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  • Porous film and manufacturing method thereof
  • Porous film and manufacturing method thereof
  • Porous film and manufacturing method thereof

Examples

Experimental program
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Embodiment 1

[0061] film extrusion

[0062] Use polypropylene, MFR = 1.9, Mw = 400000, melt the plastic through an extruder to extrude polypropylene film under the conditions of die gap (Die gap) = 3.0mm, die temperature (Die Temp.) = 210°, and wind up The thickness is controlled at 15μm; polyethylene, MFR=1.9, density=0.96g / cm 2 , the plastic is melted through an extruder to extrude polyethylene film under the conditions of Die gap=3.0mm, Die Temp.=190 degrees, and the winding thickness is controlled at 17 μm.

[0063] heat treatment

[0064] The PE film was heat-treated in an oven at 125°C under a tension of 5% for 120 seconds; the PP film was heat-treated in an oven at 140°C under a tension of 5% for 300 seconds.

[0065] PE layer extension

[0066] The heat-treated PE film is first subjected to the first stretching treatment (temperature 25°C, stretching ratio 40%), and then the second stretching treatment (temperature 100°C, stretching ratio 100%).

[0067] thermal bonding

[006...

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Abstract

The invention discloses a porous film and a manufacturing method thereof. The manufacturing method comprises the following steps of: extruding to form a first thin film; carrying out heat treatment and extending treatment on the first thin film; extruding to form a second thin film; carrying out heat treatment on the second thin film; overlapping the first thin film which is subjected to the heat treatment and the extending treatment with the second thin film which is subjected to the heat treatment; adhering to form an overlapped thin film; and carrying out the extending treatment on the overlapped thin film to form the porous film. According to the porous film and the manufacturing method, by changing a manufacturing process, the manufactured porous film has relatively high stripping capability and relatively low contractibility.

Description

technical field [0001] The invention relates to a porous membrane and a manufacturing method thereof, in particular to a manufacturing method of a battery separation membrane. Background technique [0002] The current lithium-ion battery is composed of four major materials: positive electrode material, negative electrode material, electrolyte, and separator. The requirements for the separator are as follows: electrical insulation, and through holes that can provide ion transmission. , solvent corrosion resistance, mechanical strength, high-temperature dimensional stability, high-temperature melting resistance and low-temperature closed-cell characteristics; and the single-layer structure isolation film cannot have both high-temperature melting resistance and low-temperature closed-cell characteristics, so it must Use a multi-layer structure of the isolation film to achieve both purposes. [0003] There are two ways to manufacture multilayer isolation membranes (or porous me...

Claims

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Application Information

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IPC IPC(8): B32B37/06B32B27/32H01M2/18
CPCY02E60/12Y02E60/10
Inventor 陈信维
Owner BENQ MATERIALS WUHU CORP