Coating device for high-temperature resistant multilayer composite lithium-ion battery separator

Abstract

The invention relates to a coating device for a high-temperature resistant multilayer composite lithium-ion battery separator, and belongs to the technical field of lithium-ion batteries. The coating device comprises a base-film release scroll, gluing rollers, composite membrane unwinding mechanisms, a heating-drying mechanism and a retracting scroll which are arranged in sequence, wherein one end of a base membrane is wound on the base-film release scroll, and the other end of the base membrane is wound on the retracting scroll; the gluing rollers and the composite membrane unwinding mechanisms are arranged in one-to-one correspondence and set to be two groups on two sides of the base membrane; each of the composite membrane unwinding mechanisms comprises a composite membrane release scroll and a pressing shaft; one end of a composite membrane is wound on the composite membrane release scroll, and the other end of the composite membrane is attached with the base membrane after penetrating through the pressing shaft; the gluing rollers and the pressing shafts are propped against the membrane surface of the base membrane on the corresponding side; the coating device can enable the composite membrane and the base membrane in close combination to form the high-temperature resistant multilayer composite lithium-ion battery separator. The separator disclosed by the invention has relatively high thermal stability and heat-resistant shrinkage factor, relatively stable composite structure and relatively high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a coating device for lithium-ion battery diaphragms, in particular to a coating device for high-temperature-resistant multilayer composite lithium-ion battery diaphragms. Background technique [0002] The basic function of the battery separator in a lithium battery is to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. 3C products include computers (Computer), communications (Communication) and consumer electronics (ConsumerElectronics), which are the main fields of lithium battery application. For lithium batteries of 3C products, only PP separator and PE separator are used, and its performance can be obtained. nice to meet. However, with the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicles. Lithi...

AI Technical Summary

Problems solved by technology

At present, the high temperature resistance and heat-resistant shrinkage of the ceramic coated separator cannot meet the requirements under certain temperature conditions. The composite method of PET non-woven fabric and ceramic coated separator is used to make the heat resistance and stability of the lithium battery separator. The heat-resistant shrinkage rate has been greatly improved to enhance market competitiveness, but there is no coating device for this composite diaphragm in the prior art

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