A calender-coated lithium supplement all-in-one machine

Abstract

The invention discloses an integrated machine for calendering film-coated lithium supplementation. A first lithium strip is attached to a first isolation film to form a first lithium replenishment strip; and a second lithium strip is attached to a fourth isolation membrane to form a second lithium replenishment strip; The first and second lithium-replenishing strips are respectively located on one side of the pole piece and enter the coating device simultaneously with the pole piece; The sheet winding device is wound; the first isolation film is wound by the first isolation film winding device, and the fourth isolation film is wound by the fourth isolation film winding device; The two processes of lamination are combined together. By organically combining the original independent calendering mechanism and the laminating mechanism, a complete set of calendering and laminating lithium-replenishing machine equipment that integrates calendering and lamination is formed, which solves the problem of extreme problems. The problem of simultaneous coating of lithium film on both sides of the sheet, and the compact structure and excellent performance can realize industrial application.

Description

technical field [0001] The invention relates to a pole piece lithium replenishment device, in particular to a calender-covered film-covered lithium-replenishment integrated machine which combines calendering and film covering, and belongs to the technical field of lithium ion battery production. Background technique [0002] During the first charging process of the battery, part of the lithium will be consumed due to the formation of the solid electrolyte film (SEI film), which will cause the loss of lithium in the positive electrode material, thereby reducing the capacity of the battery and resulting in a decrease in the first efficiency. This is especially evident in the negative electrode sheet with alloy material as the active material. In addition, during the cycle of lithium-ion batteries, the SEI film is consumed and repaired, and the increase in dead lithium inside the positive and negative electrodes makes the capacity of the battery continue to decline, resulting i...

AI Technical Summary

Problems solved by technology

In addition, during the cycle of lithium-ion batteries, the SEI film is consumed and repaired, and the increase in dead lithium inside the positive and negative electrodes makes the capacity of the battery continue to decline, resulting in a decrease in the cycle life of the battery.

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