Pole piece lithium supplementing system

Abstract

The invention discloses a pole piece lithium supplementing system, and relates to the technical field of lithium supplementing. The pole piece lithium supplementing system comprises an unwinding device, a lithium supplementing device and a winding device, the unwinding device is used for winding the pole piece and outputting the wound pole piece; the lithium supplementing device is used for receiving the pole piece output by the unwinding device, carrying out lithium supplementing operation on the front surface and the back surface of the pole piece in a laser lithium plating manner, cooling the pole piece subjected to lithium supplementing operation and then outputting the pole piece; and the winding device is used for receiving the pole piece output by the lithium supplementing device and winding the pole piece. According to the pole piece lithium supplementing system, lithium supplementing operation is conducted on the front face and the back face of the pole piece in advance in a laser lithium plating mode, safety and reliability are achieved, the content of active lithium in a battery cell can be effectively increased, and therefore the energy density and the cycle life of thebattery cell are greatly improved; meanwhile, the lithium supplementing process is simple, the equipment cost can be effectively reduced, the consistency of lithium supplementing operation is ensured, and the production yield and efficiency are greatly improved.

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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