A pole piece coating method and coating nozzle

Abstract

The invention relates to a pole piece coating method and a coating nozzle. The invention has the method that in the width direction of a coating head of an incline extrusion coating machine a coating material section and a sealing section are arranged at intervals according to the design parameters of a pole piece, and laid into a foil tape to be continuously coated when the machine is started, thereby obtaining the pole piece extending along the direction of a transporting tape in the blank area of the sealing section. The invention fully combines the advantages of a prior incline extrusion coating method and a discontinuous coating method, the coating can be continuous, the efficiency is high, and the thickness of the pole piece is uniform and consistent. The invention also provides the coating nozzle used for the implementation of the coating, the material feeding of the coating nozzle is uniform, the processing is simple, and the adjustment is flexible and accurate.

Description

Technical field [0001] The invention relates to a pole piece coating method and a coating nozzle. Background technique [0002] Since the concept of "Rocking Chair Battery" (RCB) was put forward in 1980, Sony Corporation of Japan and Sanyo Corporation began practical research on lithium-ion secondary batteries in 1985 and 1988, respectively. Because lithium-ion secondary batteries have high working voltage, High specific energy, low self-discharge, wide application temperature range, stable working voltage, long storage life and other outstanding features. Countries all over the world are applying lithium-ion secondary batteries in the field of communications, portable electronics, electric vehicles, aerospace, etc. Expressed great interest, and continuously explored and improved the performance and manufacturing process of lithium-ion secondary batteries. [0003] In recent years, the manufacturing technology of lithium-ion batteries has made great progress. For example, the cap...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: the lithium-ion battery 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; and the pole piece is easy to lose powder. short circuit of the battery

[0004] (1) At the point where the back roller and the coating roller are just in contact, the slurry will accumulate, making the thickness of the pole piece thicker by 20-30 microns;

[0005] (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, so the thickness consistency of the pole piece is poor. Defects Inherent in Coating Method

[0006] (3) Due to the stability of the machine, the spacing will change. When the second side is painted, the paint cannot be completely and accurately aligned

In order to achieve its coating effect, it must change the feeding cavity and flow field, which has disadvantages such as uneven feeding and increased processing difficulty (multiple feeding ports).

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