A pole piece lithium supplement system

Abstract

The invention discloses a pole piece lithium supplementation system, which relates to the technical field of lithium supplementation. The pole piece lithium replenishment system includes an unwinding device, a lithium replenishment device and a winding device; the unwinding device is used to wind the pole piece and output the wound pole piece; the lithium supplementary device is used to receive the pole piece output by the unwinding device , and perform lithium replenishment operations on both the front and back of the pole piece by laser lithium plating, and output the pole piece after the lithium supplementation operation is cooled; the winding device is used to receive the pole piece output by the lithium supplementation device, and Coil the pole piece. The pole piece lithium replenishment system uses laser lithium plating to replenish lithium on the front and back of the pole piece in advance, which is safe and reliable, and can effectively increase the active lithium content inside the battery cell, thereby greatly increasing the energy of the battery cell Density and cycle life; at the same time, the lithium supplementation process is simple, which can effectively reduce equipment costs, ensure the consistency of lithium supplementation operations, and greatly improve production efficiency and efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium supplementation, in particular to a pole piece lithium supplementation system. Background technique [0002] New energy vehicles have become the future development direction, and the market has higher and higher requirements for its cruising range and service life. In existing lithium-ion batteries, when charging for the first time, due to the formation of the SEI film, a part of lithium ions will be consumed, making this part of lithium ions unable to become active lithium that can provide effective capacity for the battery cell, resulting in a loss of battery capacity. In order to make up for this part of the lost active lithium and increase the battery capacity, the prior art discloses methods such as lithium supplementation with lithium liquid, lithium supplementation with lithium powder, vacuum evaporation, and pressing of lithium strips. [0003] However, lithium supplementation with lithiu...

AI Technical Summary

Problems solved by technology

[0003] However, lithium supplementation with lithium liquid has high environmental requirements, is easy to catch fire, and is highly dangerous; the consistency of lithium powder supplementation is poor, and lithium powder is easy to explode if it falls indoors; the consistency of vacuum lithium plating is good, but the equipment cost is huge and difficult to measure. Production; Lithium ribbon pressing consistency is poor, high cost

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