All-in-one machine for rolling, laminating and lithium-supplementing

Abstract

The invention discloses an all-in-one machine for rolling, laminating and lithium-supplementing. A first lithium strip is adhered on a first isolating membrane to form a first lithium supplementing strip; a second lithium strip is adhered on a fourth isolating membrane to form a second lithium supplementing strip; the first lithium supplementing strip and the second lithium supplementing strip are respectively located on one side of a pole piece and enter a laminating device with the pole piece simultaneously; the first lithium strip and the second lithium strip are adhered on the pole piece to form a lithium supplementing pole piece and are coiled by a pole piece coiling device; the first isolating membrane is coiled by a first isolating membrane coiling device, and the fourth isolating membrane is coiled by a fourth isolating membrane coiling device. The two procedures of rolling and laminating in the process of supplementing lithium for the pole piece are combined together, a rolling mechanism and a laminating mechanism, which are originally independent, are organically combined together to form a whole set of the all-in-one machine integrating rolling and laminating, so that the problem of laminating lithium membranes on both sides of the pole piece is solved, the structure is compact, the performance is excellent, and industrialized application of the all-in-one machine can be achieved.

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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