Lithium ion battery pole piece coating method and coating machine

Abstract

The invention discloses a lithium ion cell pole tip applying method, which arranges the dressing section and the dead section by the design parameter interval of the pole tip and puts foil bend to start continues applying on the width direction of the coating machine headstock to obtain the pole tip extended on the band direction of the dead margin area. The invention also provides a coating machine which can achieve the method.

Description

【Technical field】 [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to a method for manufacturing pole pieces of lithium ion batteries. 【Background technique】 [0002] Since the concept of "rocking chair battery" (RCB) was proposed in 1980, Japan's Sony Corporation and Sanyo Corporation began practical research on lithium-ion secondary batteries in 1985 and 1988, respectively. With outstanding features such as large specific energy, small self-discharge, wide application temperature range, stable working voltage, and long storage life, all countries in the world are paying attention to the application of lithium-ion secondary batteries in the field of communications, portable electronic products, electric vehicles, and aerospace. The applications showed great interest and enthusiasm, and the performance and manufacturing process of lithium-ion secondary batteries were continuously explored and improved. [0003] In recent years,...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: the pole piece needs to be scraped (the so-called scraper is to scrape off the coating layer on the pole piece for a certain length to form a blank area), which is time-consuming and laborious; short circuit

Such a coating method saves the traditional scraping process, but still has the following disadvantages: 1) At the point where the backing roll and the coating roll are just in contact, the slurry will accumulate, making the thickness of the pole piece thicker by 20 ~30 microns; 2) Since the reaction of the machine itself takes a certain amount of time, the tailing of the slurry will occur at the distance between the back roller and the coating roller, making the pole piece thinner

Therefore, the thickness consistency of the pole piece is poor

This is an inherent flaw in this coating method

3) Due to the stability of the machine, the spacing will change, and the dressing cannot be completely and accurately aligned when coating the second side

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