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High-performance lithium battery separator dry double-drawing process

A lithium battery diaphragm, high-performance technology, applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of uneven pore size distribution of diaphragm micropores, large porosity changes, lateral shrinkage, etc., and reach the range of product thickness wide, low transverse shrinkage, and small transverse shrinkage

Active Publication Date: 2019-07-26
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic lithium battery separators mainly have problems such as uneven pore size distribution, uneven thickness, lateral shrinkage, and large porosity changes.

Method used

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  • High-performance lithium battery separator dry double-drawing process
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  • High-performance lithium battery separator dry double-drawing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-performance lithium battery diaphragm dry double drawing process includes the following steps:

[0028] (1) Dissolve ultra-polypropylene, antioxidant, nucleating agent and silica in a certain proportion in a soluble polymer solvent to form a sol-like composite, and then add it into the mixer to fully stir the raw materials at a speed of 200 rpm ;

[0029] (2) Take out the raw material obtained in step (1) and transfer it to the template, absorb the solvent with molecular sieve, and then transfer it to a vacuum drying oven for drying;

[0030] (3) Put the mixture dried in step (2) into an extruder and heat it at 180°C for continuous extrusion to form a substrate;

[0031] (4) The substrate extruded from the twin-screw extruder is cooled and molded by a cooling molding machine with a temperature range of 5 to 40°C at a speed of 10 m / min;

[0032] (5) The substrate is stretched horizontally and vertically at a speed of 2 m / min through the biaxial stretching equipment to stre...

Embodiment 2

[0044] A high-performance lithium battery diaphragm dry double drawing process includes the following steps:

[0045] (1) Dissolve ultra-polypropylene, antioxidant, nucleating agent and silica in a certain proportion in a soluble polymer solvent to form a sol-like composite, and then add it into the mixer to fully stir the raw materials at a speed of 250rpm ;

[0046] (2) Take out the raw material obtained in step (1) and transfer it to the template, absorb the solvent with molecular sieve, and then transfer it to a vacuum drying oven for drying;

[0047] (3) Put the mixture dried in step (2) into an extruder and heat it at 220°C for continuous extrusion to form a substrate;

[0048] (4) The substrate extruded from the twin-screw extruder is cooled and molded by a cooling molding machine with a temperature range of 25°C at a speed of 15 m / min;

[0049] (5) The substrate is stretched horizontally and vertically at a speed of 3 m / min through the biaxial stretching equipment to stretch th...

Embodiment 3

[0061] A high-performance lithium battery diaphragm dry double drawing process includes the following steps:

[0062] (1) Dissolve the super polypropylene, antioxidant, nucleating agent and silica in a certain proportion in a soluble polymer solvent to form a sol-like compound, and then add it into the mixer to fully stir the raw materials at a speed of 300 rpm ;

[0063] (2) Take out the raw material obtained in step (1) and transfer it to the template, absorb the solvent with molecular sieve, and then transfer it to a vacuum drying oven for drying;

[0064] (3) Put the mixture dried in step (2) into an extruder and heat it at 250°C for continuous extrusion to form a substrate;

[0065] (4) The substrate extruded from the twin-screw extruder is cooled and molded by a cooling molding machine with a temperature range of 40°C at a speed of 20 m / min;

[0066] (5) The substrate is stretched horizontally and vertically at a speed of 5m / min through the biaxial stretching equipment to stretch...

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Abstract

A high-performance lithium battery separator dry-process double-drawing process, including stirring and drying the raw materials, putting the drying head into an extruder to extrude a substrate, cooling the substrate to shape, biaxially stretching and heat-treating the substrate, Finally, cut and pack. The dry double-drawing process used in the present invention has the following advantages: low transverse shrinkage, simple process, wide range of product thickness (the product thickness is 0.015mm to 0.06mm, and the laboratory has reached 0.08mm); it can be used with power batteries; the finished product The rate is as high as 65% or more (generally 30% to 50% in the industry); the micropore size distribution is uniform, and the air permeability is better. PP and PE can be used as raw materials, and three-layer composite films can also be made; compared with wet process, The production process has little environmental pollution.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-performance lithium battery diaphragm dry method double drawing process. Background technique [0002] In the lithium-ion battery positive electrode, separator, electrolyte, and negative electrode components, the cost of the lithium battery separator accounts for about 1 / 3 of the battery cost. The separator is an electrically insulating film with a porous structure, which is a key internal component of the lithium ion battery. Its main function is to separate the positive and negative electrodes of the battery to prevent direct contact between the two poles to prevent short-circuit; it has the function of allowing ions to pass freely, and it can also block the current conduction in the battery through the closed cell function when the battery is overheated. The performance of the diaphragm determines the interface structure and internal resistance of the battery, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 胡伟吴磊张德顺李汪洋孙晓华王若愚徐凤锦刘志强谢玉良
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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