Pole piece processing method and equipment

Abstract

The invention provides a pole piece processing method and pole piece processing equipment, and the pole piece processing method comprises the steps of coating, rolling, slitting and die cutting. The method concretely comprises the following steps: firstly, preparing a pole piece belt with a plurality of film coating areas and blank areas, alternately arranging the film coating areas and the blankareas in the conveying direction of the pole piece belt, then slitting the pole piece belt to obtain pole piece strips, and finally die-cutting the pole piece strip to obtain the pole piece. The polepiece processing method disclosed by the invention is not limited by the breadth capacity and the foil supply capacity of a coating machine, so that the problem that the length of the pole piece is limited can be solved, and the problems of low production yield and low efficiency can be remarkably improved; the length direction of a tab forming area, namely the blank area, is orthogonal to the conveying direction of the pole piece belt, so that the pole piece with relatively long length can be prepared even if the breadth is relatively narrow, and the risk of wrinkling and belt breaking in therolling process is relatively small; and the two procedures of slitting and die cutting are adopted to replace the procedure of one-step die cutting, the requirement for the flatness of the cutting edge of the die cutting can be lowered, and therefore the quality and the yield of pole pieces are effectively improved.

Description

technical field [0001] The invention relates to the technical field of pole piece processing, in particular to a pole piece processing method. At the same time, the invention also relates to a pole piece processing equipment for realizing the pole piece processing method. Background technique [0002] With the development of the new energy vehicle market, the demand for lithium-ion power batteries is getting stronger and stronger. At the same time, the competition in the industry and products is becoming more and more fierce. The main competition direction is the cost and energy density of lithium-ion power batteries. [0003] At present, CTP technology is generally implemented in the industry. Simply put, CTP technology is to reduce the intermediate process of modules and directly integrate the cells inside the battery into the battery pack, which puts forward new requirements for the size of the cells. Specifically, the current common cell length is 221mm or 148mm, and CT...

AI Technical Summary

Problems solved by technology

[0006] 1. The length and size of the pole piece is limited by the size of the coating machine and the foil material, mainly depends on the maximum coating width. At present, the maximum coating width in the industry is about 1400mm, that is, the longest pole piece size that can be produced is about 1400mm

[0007] 2. The length direction of the blank area of ​​the pole piece is located on one side of the pole piece belt, and the length direction of the blank area is consistent with the conveying direction of the pole piece belt. Due to the ductility in the pole piece rolling process, the wider the width The greater the ductility, and the greater the width, the greater the tension fluctuation, which is likely to cause problems such as wrinkles and broken belts, and the problem of low yield and low efficiency is more prominent

[0008] 3. Due to the longer pole piece, the requirements for the flatness of the die-cutting blade become more stringent, and the processing of the die-cutting mold becomes more difficult, and problems such as burrs and material drop are prone to occur. If laser equipment is used for die-cutting, it is limited Due to the equipment stroke, the size of the pole piece will also be limited

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