Pole piece laser die-cutting method

Abstract

The invention discloses a pole piece laser die-cutting method. The method comprises the following steps: (1) providing a foil; (2) dividing the surface of the foil into a first coated region, a blankregion and a second coated region, wherein the blank region is positioned between the first coated region and the second coated region; (3) coating electrode slurry to the first coated region and thesecond coated region, roasting and rolling a obtained pole piece in sequence to obtain a pole piece to be die-cut; and (4) utilizing laser to perform lug die-cutting on the blank region to obtain multiple first lugs and multiple second lugs, and dividing the pole piece to be cut into a first pole piece and a second pole piece. The pole piece laser-cutting method disclosed by the invention can cutthe foil while accomplishing lug die-cutting and forming, so that lug processing cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a low-cost laser die-cut pole piece processing method. Background technique [0002] Laser die cutting is widely used in the tab forming of battery pole pieces due to its characteristics of small cutting burrs, low maintenance cost and high flexibility. At present, the tab forming schemes mainly include: 1. Slitting the pole piece first, and then performing laser die-cutting to realize the forming of the pole piece tab; Then slice it. In the above two schemes, the state of the pole piece incoming material is that the dressing area (10, 20) is in the middle, and the blank area (11, 21) is on both sides, such as figure 1 shown. During laser die-cutting, the pole piece moves vertically, and the laser moves back and forth horizontally, which is the S-shaped lug cutting process mentioned in the industry. The production process is as follows: figure 2 shown. ...

AI Technical Summary

Problems solved by technology

[0003] However, there are still some defects in the above two schemes: 1. The utilization rate of the foil in the blank area of ​​the pole piece is low, and long-term mass production will cause a lot of waste; 2. Slitting machines are used in the production process, and the pole piece The burrs in the slitting process cannot be 100% monitored, and the quality of the pole piece cannot be fully guaranteed; 3. The slitting knife of the slitting machine is a consumable, which needs to be polished, maintained and replaced regularly, and the production cost increases

Therefore, the existing laser die-cut pole piece method still needs to be improved

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