Laser cutting head

Abstract

The invention discloses a laser cutting head for cutting a pole piece of a power lithium ion battery. The head comprises a mounting housing, a focusing lens seat, a cutting nozzle, a focal length fine adjustment device and a laser input head, wherein the interior of the mounting housing is a cavity; a focusing lens is assembled in the focusing lens seat; the upper part of the cutting nozzle is connected with the focusing lens seat; the focal length fine adjustment device is fixed in the mounting housing, and the focusing lens seat is connected and fixed with the focal length fine adjustment device; the laser input head is connected and fixed with the mounting housing through a mounting seat of the laser input head; and a light path is formed in the laser input head, the mounting housing, the focusing lens seat and the cutting nozzle. The laser cutting head can be used for replacing a traditional mechanical cutting head for cutting copper foils, aluminum foils and coating regions thereof with a high reflection characteristic, and meet the production need of cutting the pole piece of the power lithium ion battery.

Description

technical field [0001] The invention relates to a laser cutting head. Background technique [0002] For the production of lithium batteries, smaller battery pole pieces are generally produced by winding. For larger power lithium batteries, they are mainly produced by lamination. Before lamination, the roll material needs to be cut into the shape and size required by the lithium battery pole pieces, and then they can be stacked one by one. The pole piece cutting method currently used is generally mechanical cutting, mainly punching and rolling. One problem with mechanical cutting is that it will cause burrs at the pole piece disconnection after cutting, and the burr of the pole piece is one of the most important factors affecting the safety of lithium batteries, because the burr may puncture the separator between the positive and negative pole pieces This will lead to a short circuit between the positive and negative poles of the battery, and in severe cases, the battery w...

AI Technical Summary

Problems solved by technology

One problem with mechanical cutting is that it will cause burrs at the pole piece disconnection after cutting, and the burr of the pole piece is one of the most important factors affecting the safety of lithium batteries, because the burr may puncture the separator between the positive and negative pole pieces This will lead to a short circuit between the positive and negative poles of the battery, and in severe cases, the battery will explode.

Moreover, the force of mechanical cutting will also have an adverse effect on the performance of the battery pole piece.

If a laser cutting machine is used to cut the battery pole piece, since the copper foil, aluminum foil and the coating area of ​​the battery pole piece have high reflection characteristics and high reflectivity to the laser, directly using the existing laser cutting head cannot be effective. Precisely cut the pole piece, the cutting effect is not ideal

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