Ultra-thin lithium foil strip transfer method and device

Through the scratches and roller compression of the ultra -thin lithium foil used in lithium ion batteries, the relative thickness of the lithium foil is reduced, and the problem of insufficient thickness of lithium foil in the lithium ion battery in the lithium ion battery has improved the usage rate and battery of metal lithium Lithium nourishing efficiency.

CN113148734BActive Publication Date: 2025-01-24CHINA ENERGY LITHIUM
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Patent Information

Application Number
CN202010074407.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-01-22
Publication Date
2025-01-24
Estimated Expiration
2040-01-22

AI Technical Summary

Technical Problem

The thinnest lithium foil used in existing lithium-ion batteries is still around 4-5 microns, which is difficult to meet the battery's lithium replenishment needs, and the utilization rate of metal lithium is relatively low.

Method used

By treating the ultra -thin lithium foil scratch supported by the film, multiple ultra -thin lithium strips are formed, and the bump roller is used for roller press, and part of the lithium foil is compounded with the support membrane to a part of The relative thickness of small lithium foil.

Benefits of technology

It effectively reduces the relative thickness of the ultra-thin lithium foil, increases the utilization rate of metallic lithium, and meets the demand for battery lithium replenishment. At the same time, the structure is simple and easy to implement, and is suitable for rapid mass production.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a method and device for transferring ultra-thin lithium foil strips, and the method comprises: providing an ultra-thin lithium foil with a film support; scratching the bare lithium surface of the ultra-thin lithium foil with a film support to form a plurality of ultra-thin lithium strips bounded by a scratch line; providing a release film, the release force of which is greater than the release force of the support film; arranging the bare lithium surface of the scratched ultra-thin lithium foil opposite to the release surface of the release film, rolling with a concave-convex roller, the concave-convex boundary line of the concave-convex roller being aligned with the scratch line; after the rolling is completed, separating the support film from the release film, a part of the ultra-thin lithium foil is still compounded with the support film, and the other part is transferred to the release film. The technical solution of the invention is simple to operate, reduces the relative thickness of the ultra-thin lithium foil, and can be mass-produced roll-to-roll.
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Citation Information

Patent Citations

  • Ultrathin lithium foil striping transfer device

    CN211895349U