Pole piece lithium supplementing all-in-one machine and lithium supplementing method thereof

Abstract

The invention relates to the technical field of lithium battery production, and particularly discloses a pole piece lithium supplementing all-in-one machine and a lithium supplementing method thereof.The pole piece lithium supplementing all-in-one machine comprises a calendering device and a covering device; the laminating device comprises a pole piece unwinding mechanism, a lithium film laminating mechanism and a pole piece winding mechanism, the laminating device comprises a second rack, a first laminating roller and a second laminating roller, the first laminating roller and the second laminating roller are arranged on the second rack, and the distance between the first laminating roller and the second laminating roller can be adjusted so as to ensure the precision when the pole piece and the lithium film are laminated; a pole piece feeding mechanism is arranged on the feeding side of the second rack and used for conveying and guiding pole pieces. When the lithium supplementing production line is started, the protective film, the lithium adhering protective film and the lithium strip are synchronously unreeled and enter the calendering mechanism. And after being pressed and covered by the rolling mechanism, the lithium strip is rolled into a lithium film and is adhered to the lithium adhering protective film, and finally, the lithium film is pressed and covered by the covering device, so that the lithium film is adhered to the negative plate, and the lithium supplementing operation of the negative plate is completed.

Description

technical field [0001] The present application relates to the technical field of lithium battery production, in particular to a pole piece lithium replenishing integrated machine and a lithium replenishing method. Background technique [0002] Lithium-ion batteries will form a solid electrolyte membrane during the first charge and discharge process, and the solid electrolyte membrane will consume part of the lithium, resulting in the loss of lithium, which in turn leads to the loss of lithium-ion battery capacity. In order to compensate for the loss of active lithium during the first charge and discharge of the lithium-ion battery, during the forming process of the pole piece, it is necessary to supplement active lithium on the active material layer of the pole piece in advance. At present, the capacity and cycle life of lithium-ion batteries are usually improved by coating lithium on the surface of the pole piece through a lithium-replenishing production line. [0003] The...

AI Technical Summary

Problems solved by technology

Whether it is the calendering of the lithium film or the lamination process of the lithium film and the pole piece, the most critical thing is the accuracy of the lithium film and the lithium film laminated to the pole piece. The lithium film and the pole piece are prone to shift during the lamination process. This phenomenon may lead to low lamination accuracy between the lithium film and the pole piece, and affect the quality of lithium supplementation of the pole piece.

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