Chilling system device for eliminating apparent defect bright spots of lithium battery diaphragms

A technology of lithium battery separator and appearance defect, applied in the field of lithium battery manufacturing, can solve problems such as appearance defect of lithium battery separator, affecting the qualified rate of finished film, etc.

Pending Publication Date: 2021-10-29
九江冠力新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the cast sheet cast from the die is very soft before and during cooling, if there are tiny impurities in the water or water or oil accumulation on the chilling roller, it will form the appearance defect of the lithium battery sep

Method used

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  • Chilling system device for eliminating apparent defect bright spots of lithium battery diaphragms
  • Chilling system device for eliminating apparent defect bright spots of lithium battery diaphragms
  • Chilling system device for eliminating apparent defect bright spots of lithium battery diaphragms

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[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings, in which several embodiments of the present invention are given, but the present invention can be implemented in different forms and is not limited to the description in the text rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0034] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it may be The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for the purpose of illustration only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated by one of ordina...

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Abstract

The invention provides a chilling system device for eliminating apparent defect bright spots of lithium battery diaphragms. The chilling system device comprises a circulating water pool, a water filtering assembly is arranged on the periphery of the circulating water pool, a supporting frame is fixed to the top end of the circulating water pool, a die head is fixed to one end in the supporting frame, an impurity removing assembly is fixed to the other end in the supporting frame, a chilling roller rotationally connected with the inner wall of the supporting frame through a rotating shaft is arranged between the die head and the impurity removing assembly, and a stripping roller is arranged at the die stripping end of the chilling roller. By means of the chilling system device, the situation that due to the fact that the speed of the chilling roller is high, water drops or oil drops are brought out on the surface, and consequently the appearance defects, bright spots, are caused when the chilling roller is attached to a casting piece in a molten state again can be reduced, and the situation that more and more PE powder and oil are accumulated in cooling water, that is, many impurities exist in the cooling water and are adsorbed on a soft casting piece can be reduced.

Description

technical field [0001] The invention mainly relates to the technical field of lithium battery manufacturing, in particular to a chilling system device for eliminating bright spots of defects on the appearance of lithium battery diaphragms. Background technique [0002] The production process of lithium battery separator is mainly divided into dry method and wet method. The common process includes: extruder extrusion casting, cast sheet forming, stretching, heat treatment, winding, slitting, etc., among which cast sheet forming Partly, the cast sheet is cooled by cooling water and chill rolls. [0003] According to the lithium battery diaphragm cast sheet chilling system provided by the patent document CN201721688796.X, the lithium battery diaphragm cast sheet chilling system includes a die head, a chill roller located under the die head and The water bath under the roller and the attached air knife on one side of the die head, the chilling roller is a hollow roller, one end...

Claims

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Application Information

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IPC IPC(8): B29C43/24B29C43/46B29C43/52
CPCB29C43/24B29C43/46B29C43/52
Inventor 许成伟张凯
Owner 九江冠力新材料有限公司
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