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Dry unidirectional stretching method for manufacturing lithium battery diaphragm

A lithium battery diaphragm, unidirectional stretching technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of unstable batches, complicated machinery, equipment and processes, and uneven porosity of the diaphragm.

Inactive Publication Date: 2014-10-29
天恩智慧能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the prior art and provide a production method for manufacturing lithium battery separators by dry uniaxial stretching, which can solve the problem of uneven pore-forming, unstable batches, machine equipment and processes of the current separators. overly complex issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The dry method uniaxial stretching manufactures the production method of lithium battery diaphragm, carries out according to the following steps:

[0019] Step 1: Select polypropylene (PP), low-density polyethylene (LDPE), sorbitol (C6H14O6), oil and reinforcing materials as raw materials;

[0020] Step 2: Combine polypropylene (PP) with a mass percentage of 75%, sorbitol with a mass percentage of 8%, reinforcing materials with a mass percentage of 6%, and oil with a mass percentage of 11% through a mixer, and then pass The drying process of the dryer is extruded and granulated by a twin-screw extruder to make the first pellet; the low-density polyethylene (LDPE) with a mass percentage of 89% and the reinforcing material with a mass percentage of 11% are mixed After the feeder is combined, it is dried by a dryer, extruded and granulated by a twin-screw extruder to make the second pellet;

[0021] Step 3: Mix the first granule and the second granule in step ...

Embodiment 2

[0029] Example 2: The production method of dry uniaxial stretching to manufacture lithium battery separators is carried out as follows: Step 1: Select polypropylene (PP), low-density polyethylene (LDPE), sorbitol (C6H14O6), grease and reinforcing materials as raw materials ;

[0030] Step 2: Combine polypropylene (PP) with a mass percentage of 93%, sorbitol with a mass percentage of 0.1%, reinforcing material with a mass percentage of 0.1%, and oil with a mass percentage of 6.8% through a mixer, and then pass The drying treatment of the dryer is extruded and granulated by a twin-screw extruder to make the first pellet; the low-density polyethylene (LDPE) with a mass percentage of 96% and the reinforcing material with a mass percentage of 4% are mixed After the feeder is combined, it is dried by a dryer, extruded and granulated by a twin-screw extruder to make the second pellet;

[0031] Step 3: Mix the first granule and the second granule in step 2 at a ratio of 1:2 to form...

Embodiment 3

[0039] Example 3: The production method of dry uniaxial stretching to manufacture lithium battery separators is carried out as follows: Step 1: Select polypropylene (PP), low-density polyethylene (LDPE), sorbitol (C6H14O6), grease and reinforcing materials as raw materials ;

[0040] Step 2: Combine polypropylene (PP) with a mass percentage of 80%, sorbitol with a mass percentage of 6%, reinforcing material with a mass percentage of 4%, and oil with a mass percentage of 10% through a mixer, and then pass The drying process of the dryer is extruded and granulated by a twin-screw extruder to make the first pellet; the low-density polyethylene (LDPE) with a mass percentage of 92% and the reinforcing material with a mass percentage of 8% are mixed After the feeder is combined, it is dried by a dryer, extruded and granulated by a twin-screw extruder to make the second pellet;

[0041] Step 3: Mix the first granule and the second granule in step 2 at a ratio of 1:3 to form a mixt...

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Abstract

The invention relates to a dry unidirectional stretching method for manufacturing a lithium battery diaphragm. The method is as below: mixing 75-93 wt.% of polypropylene, 0.1-8 wt.% of sorbitol, 0.1-6 wt.% of a reinforced material and 5-16 wt.% of oil by a mixing machine, and extruding the materials by a twin screw extruder to produce a first granule material; mixing 89-96 wt.% of low density polyethylene and 1-12 wt.% of a reinforced material by a mixing machine, and extruding the materials by a twin screw extruder to produce a second granule material; mixing the first granule material and the second granule material according to a certain proportion, and preparing the mixed material into a diaphragm by an extruder; and successively conducting unidirectional stretching pore production, heat setting and rolling. The diaphragm produced by the method has good basic performance namely good pore uniformity, which is also the most important qualified index for the diaphragm; and the small equipment investment of the method is only 1 / 7 of that for other principles or manufacturing method under the same yield, so that the production cost is low; and the diaphragm is superb for application to a power battery, and can greatly reduce the cost of the battery and improve the safety of the battery.

Description

technical field [0001] The invention relates to a production method of a diaphragm in a lithium battery, in particular to a production method for manufacturing a lithium battery diaphragm by dry uniaxial stretching. Background technique [0002] The domestic understanding of lithium-ion battery separators is very late, and it was only recognized with the establishment of lithium batteries in China. Because many companies realize that this is an emerging industry with great profits, great market and prospects, they want to get involved in this field. However, foreign countries have adopted a policy of blocking China in this technical field, and the domestic technical community The understanding is more superficial, and it is still in the stage of exploration. So far, it has not been able to produce products with fully qualified quality. This situation has attracted the attention of governments and scientific research departments from the central to local levels. Contents of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18
CPCH01M50/403Y02E60/10
Inventor 孙合会
Owner 天恩智慧能源科技有限公司
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