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Dry-method dual-pulling process of high-performance lithium battery diaphragm

A lithium battery separator, 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 separator micropores, large porosity changes, and lateral shrinkage, etc., to overcome lateral shrinkage Problems, low lateral shrinkage, effect of small lateral shrinkage

Active Publication Date: 2017-02-22
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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  • Dry-method dual-pulling process of high-performance lithium battery diaphragm
  • Dry-method dual-pulling process of high-performance lithium battery diaphragm
  • Dry-method dual-pulling process of high-performance lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A dry-process double-drawing process for a high-performance lithium battery diaphragm, comprising the following steps:

[0028] (1) Dissolve 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 200rpm ;

[0029] (2) taking out the raw material obtained in step (1) and transferring it to the template, using molecular sieves to absorb the solvent, and then transferring it to a vacuum drying oven for drying;

[0030] (3) putting the mixture dried in step (2) into an extruder to heat and extrude continuously at 180° C. to form a substrate;

[0031] (4) making the base sheet extruded from the twin-screw extruder pass through a cooling molding machine with a temperature range of 5 to 40°C at a speed of 10 m / min for cooling and molding;

[0032] (5) The substrate is stretched horizontally and vertically at the...

Embodiment 2

[0044] A dry-process double-drawing process for a high-performance lithium battery diaphragm, comprising the following steps:

[0045] (1) Dissolve super polypropylene, antioxidant, nucleating agent and silicon dioxide in a certain ratio in a soluble polymer solvent to form a sol-like compound, then add it to the mixer to fully stir the raw materials at a speed of 250rpm ;

[0046] (2) taking out the raw material obtained in step (1) and transferring it to the template, using molecular sieves to absorb the solvent, and then transferring it to a vacuum drying oven for drying;

[0047] (3) putting the mixture dried in step (2) into an extruder to heat and extrude continuously at 220° C. to form a substrate;

[0048] (4) making the substrate extruded from the twin-screw extruder pass through a cooling molding machine with a temperature range of 25°C at a speed of 15 m / min for cooling and molding;

[0049] (5) The substrate is stretched horizontally and vertically at the same ti...

Embodiment 3

[0061] A dry-process double-drawing process for a high-performance lithium battery diaphragm, comprising the following steps:

[0062](1) Dissolve 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 to the mixer to fully stir the raw materials at a speed of 300rpm ;

[0063] (2) taking out the raw material obtained in step (1) and transferring it to the template, using molecular sieves to absorb the solvent, and then transferring it to a vacuum drying oven for drying;

[0064] (3) putting the mixture dried in step (2) into an extruder to heat and extrude continuously at 250° C. to form a substrate;

[0065] (4) making the base sheet extruded from the twin-screw extruder pass through a cooling molding machine with a temperature range of 40° C. for cooling and molding at a speed of 20 m / min;

[0066] (5) Stretch the substrate horizontally and vertically at the same time ...

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Abstract

The invention discloses a dry-method dual-pulling process of a high-performance lithium battery diaphragm. The dry-method dual-pulling process includes the steps of stirring and drying raw materials, feeding dried materials into an extruder, extruding to obtain base slice, cooling the base slice to shape performing bidirectional tensioning and thermal treatment on the base slice, slitting and packaging. The dry-method dual-pulling process has the advantages that the lateral shrinkage rate is low, simplicity is realized, the product thickness is wide (the product thickness is 0.015 mm-0.06 mm, and up to 0.08 mm in a laboratory), applicability to a power battery is realized, the product yield is up to over 65% (30-50% generally in the same industry), the micropore size distribution is uniform, high air permeability is realized, PP (propene polymer) and PE (poly ethylene) can be used as the raw materials, a three-layered composite diaphragm can be prepared, and less pollution is caused to environment as compared with that of a wet process.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-performance lithium battery diaphragm dry double-drawing process. Background technique [0002] In the lithium-ion battery positive electrode, separator, electrolyte, and negative electrode composition mechanism, 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 the key inner layer component of the lithium-ion battery. Its main function is to separate the positive and negative poles of the battery to prevent short circuit from direct contact between the two poles; it has the function of allowing ions to pass through freely, and can also block the current conduction in the battery by closing the pores when the battery is overheated. The performance of the separator determines the interface structure and internal resistance of the battery, which di...

Claims

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Application Information

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Patent Type & Authority Applications(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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