Battery diaphragm, coating process and coating system thereof and battery

A battery separator and coating process technology, used in fuel cells, battery pack components, and devices for coating liquids on surfaces, etc., can solve the problems of heat resistance, moisture, porosity, adhesion and consistency. It is expected that the safety performance and electrochemical performance cannot be taken into account at the same time, and the internal resistance of the diaphragm increases, so as to achieve the effect of reducing unstable factors, improving porosity and consistency, and improving electrochemical performance.

Active Publication Date: 2022-03-15
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each coating of this kind of composite coating product needs to go through the steps of coating, drying, winding, and unwinding. The production line is elongated and the processing cost is high. The complicated process also directly leads to the low pass rate of the product.
And often the composite coated membrane of two kinds of coatings can't reach expectations in terms of performances such as heat resistance, moisture, porosity, bonding ability and consistency, if as in the prior art, by increasing the coating amount of composite coating Improving heat resistance and adhesive performance will often lead to an excessive increase in the internal resistance of the separator, which cannot take into account both safety performance and electrochemical performance

Method used

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  • Battery diaphragm, coating process and coating system thereof and battery
  • Battery diaphragm, coating process and coating system thereof and battery
  • Battery diaphragm, coating process and coating system thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The polyolefin film is an ultra-high molecular weight PE base film with a molecular weight of 2 million, and the coating is a ceramic coating, and the ceramic coating is coated on one surface of the PE base film. The ceramic slurry includes water, thickener, ceramic particles, adhesive, wetting agent, and has a solid content of 32%.

[0053] Such as figure 1 As shown, the main process flow of this embodiment is: preliminary heat setting of polyolefin film—preparation of ceramic slurry—online coating of ceramic slurry—heat setting of coating film—control shrinkage—online winding— —Online slitting—unwinding and drying.

[0054] Such as figure 2 As shown, the coating device of this embodiment includes a defect meter 1, a thickness gauge 2, a preliminary heat setting oven 3, an adsorption roller 4, a filter 5, a transfer tank 6, a coating device 7, a shrinkage control device 8, a coating Heat setting oven 9, online winding device 10, online slitting device 11, unwinding...

Embodiment 2

[0059] This embodiment is a composite coating battery diaphragm, such as image 3 As shown, the composite coating battery separator includes a polyolefin substrate 13, a heat-resistant coating 14 coated on both sides of the polyolefin substrate 13, and a spray coating 15 sprayed on the heat-resistant coating 14. The heat-resistant coating Layer 14 is a ceramic coating.

[0060] Such as Figure 4 As shown, the main process flow of this embodiment is: preliminary heat setting of polyolefin film—preparation of ceramic slurry—online coating of ceramic slurry—online spray coating—heat setting of coating film—controlling shrinkage - On-line winding - On-line slitting - Unwinding and drying.

[0061] When the polyolefin film is not completely heat-set, the coating of the ceramic coating is carried out, and when the ceramic coating is not completely dry, the spray coating is performed.

[0062] Among them, the ceramic coating slurry with a solid content of 38.6% is configured, and ...

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Abstract

The invention relates to the field of lithium battery diaphragms, and aims to provide a battery diaphragm, a coating process and a coating system thereof and a battery, the coating process comprises the steps of polyolefin film preliminary heat setting, polyolefin film online coating and coating film heat setting, and the coating system comprises a plurality of sections of drying ovens arranged in a polyolefin film heat setting advancing route; and a coating device for coating the polyolefin film with coating slurry is arranged at the interval position of the adjacent drying ovens. An on-line coating process is set in a stage before polyolefin film heat setting is finished, a polyolefin base film and coating slurry are dried by fully utilizing the temperature of a polyolefin film heat setting oven, and a coating is in close contact with the polyolefin base film, so that the heat resistance of the coating film is effectively improved, and the water content of the coating film is reduced; and compared with an existing technological process, the technological process is more simplified, and the slitting qualification rate is also remarkably increased.

Description

technical field [0001] The invention relates to the field of lithium battery separators, in particular to a battery separator, a coating process thereof, a coating system and a battery. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. With the development of lithium-ion batteries towards high energy density, high capacity and high power density, the demand for high-performance separators is becoming more and more urgent. [0003] For single-layer coated separators, the heat resistance and moisture characteristics of battery separators prepared by traditional processes need to be further improved to ensure the safety of batteries. In addition, the traditional separator has a porosity of about 40%, poor thickness consistency, low porosity and poor smoothness of the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/04B05D3/02H01M50/403H01M50/40C09D1/00C09D7/65
CPCB05D7/04B05D3/0218B05D3/0272B05D3/0209B05D7/54C09D1/00C09D7/65B05D2201/02B05D2506/15B05D2502/00B05D2420/02H01M50/40H01M50/403H01M8/0271Y02E60/10Y02E60/50C08J7/048C08J7/06C08J2323/06C08J7/0427C08J2433/12C09D5/031H01M50/446H01M50/449H01M50/431H01M50/414
Inventor 程跃廖晨博陈永乐庄志单华靖刘倩倩
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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