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Winding process for lithium battery separator

A lithium battery separator and process technology, applied in the field of lithium battery separator preparation, can solve problems such as tension control failure, wavy edges generated by separator winding, and uneven stretching, so as to reduce defective products, realize large-scale production and operation handy effect

Inactive Publication Date: 2020-09-01
中材锂膜(常德)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a winding process of lithium battery separators to solve the technical problems of uneven stretching, failure of tension control, and release of internal stress during the winding process of the existing separators, resulting in wavy edges of the separators.

Method used

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  • Winding process for lithium battery separator
  • Winding process for lithium battery separator
  • Winding process for lithium battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S1. Cover the outer surface of the air expansion shaft with an outer diameter of 178mm with a layer of cushion cotton with a hardness of 45HA, and perform the first winding on the air expansion shaft with a width of 1200mm diaphragm covering the buffer cotton, and the first winding The tension is 4N, and the first winding speed is 80m / min;

[0041] S2. Put the diaphragm with the air expansion shaft in step S1 into the curing room for curing treatment. The curing treatment adopts the suction of the air expansion shaft to reduce the outer diameter of the air expansion shaft to 8mm and place it at a temperature of 43°C , The storage time is 13h for maturation;

[0042] S3. After separating the cured diaphragm from the air expansion shaft, perform a slitting process, and perform a second winding of the diaphragm with a width of 1100 mm.

Embodiment 2

[0044] S1. Cover the outer surface of the air expansion shaft with an outer diameter of 176mm with a layer of cushion cotton with a hardness of 43HA, and perform the first winding on the air expansion shaft with a width of 1100mm diaphragm covering the buffer cotton, and the first winding The tension is 4N, and the first winding speed is 70m / min;

[0045] S2. Put the diaphragm with the air expansion shaft in step S1 into the curing room for curing treatment. The curing treatment adopts the suction of the air expansion shaft to reduce the outer diameter of the air expansion shaft to 6mm and place it at a temperature of 43°C , The storage time is 12h for maturation;

[0046] S3. After separating the cured diaphragm from the air expansion shaft, perform a slitting process, and perform a second winding of the diaphragm with a width of 1000 mm.

Embodiment 3

[0048] S1. Cover the outer surface of the air expansion shaft with an outer diameter of 176mm with a layer of cushion cotton with a hardness of 43HA, and perform the first winding on the air expansion shaft with a width of 1100mm diaphragm covering the buffer cotton, and the first winding The tension is 5N, and the first winding speed is 90m / min;

[0049] S2. Put the diaphragm with the air expansion shaft in step S1 into the curing room for curing treatment. The curing treatment adopts the suction of the air expansion shaft to reduce the outer diameter of the air expansion shaft to 6mm and place it at a temperature of 41℃ , The time is 24h for maturation;

[0050] S3. After separating the cured diaphragm from the air expansion shaft, perform a slitting process, and perform a second winding of the diaphragm with a width of 1000 mm.

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Abstract

The invention discloses a winding process for a lithium battery separator. The winding process comprises following steps: S1, the separator is subjected to first winding on an air shaft; S2, the separator with the air shaft in S1 is subjected to curing processing, the air shaft is subjected to air extraction during curing processing, external diameter of the air shaft is reduced to 4 mm-8 mm, andthe air shaft is placed at the temperature of 35-45 DEG C for 10-48 h for curing; and S3, after the separator subjected to curing processing is separated from the air shaft, the separator is slit andsubjected to second winding. According to the winding process for the lithium battery separator, firstly, the separator winds around the air shaft and is subjected to the curing processing to releaseinternal stress of the separator, then after the separator subjected to curing processing is separated from the air shaft, the separator is slit and subjected to second winding, and on the basis of release of the internal stress of the separator, adverse phenomena of uneven thickness, wrinkles and the like of the separator subjected to second winding are eliminated.

Description

Technical field [0001] The invention relates to a method for preparing a lithium battery diaphragm, and in particular, to a winding process of a lithium battery diaphragm. Background technique [0002] In the structure of lithium batteries, the diaphragm is one of the key inner components. As one of the important internal components of lithium-ion batteries, the performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A diaphragm with excellent performance can improve the overall performance of the battery. Important role. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent the two poles from contacting and short-circuit, and also has the function of allowing electrolyte ions to pass through. At present, the commonly used raw materials for preparing lithium-ion battery separators on the mark...

Claims

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Application Information

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IPC IPC(8): B65H18/08B65H75/24H01M2/14
CPCB65H18/08B65H75/243B65H2701/1752Y02E60/10
Inventor 王丽华陈立新舒均国高保清
Owner 中材锂膜(常德)有限公司
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