Production process of aluminum foil for lithium battery prepared by high hardness roll

Abstract

The invention belongs to the technical field of non-ferrous metal processing, and relates to a production process for preparing aluminum foil for lithium batteries with high-hardness rolls, including: aluminum foil blanks use rough rolls with a roughness Ra: 0.25um at a reduction rate of 0.26mm-0.13 at a reduction rate of 50%. mm‑0.065mm pass rolling, after the 1st and 2nd pass rough rolling, and then roll the 3rd and 4th pass with roughness Ra: 0.10um medium roll; Pass finish rolling, the pass is 0.017mm-0.012mm, edge trimming, to obtain aluminum foil with a thickness of about 0.012mm; the roughness of the finish roll used is Ra: 0.07um, and the surface hardness of the middle roll and finish roll is 20-20% higher than that of ordinary rolls 25HSD; slitting, corona, etc. The invention utilizes high-hardness rollers to produce lithium battery foil, improves the deformation resistance of the rollers, enhances the stability of the roller shape under high rolling force during the battery foil production process, and achieves the shape stability of the aluminum foil produced. The lifting speed is 20% faster than that of ordinary finishing rolls, and there are fewer broken strips. The yield of battery foil is more than 15% higher than that of ordinary rolls, and the surface dyne value is 1-2 dyn higher than that of battery foils produced by ordinary rolls.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and relates to the production of aluminum foil, in particular to a production process for preparing aluminum foil for lithium batteries with high-hardness rollers. Background technique [0002] Lithium battery is a key component of the power output of new energy vehicles. Aluminum foil, as the positive electrode material, has an important impact on the life, consistency and rate discharge performance of lithium batteries. At present, aluminum foil for high-end lithium batteries requires high shape and dimensional accuracy, clean and uniform surface, and no defects such as scratches. With the continuous development of the new energy vehicle industry, the thickness of aluminum foil for high-end lithium batteries is constantly decreasing, and its requirements for tensile strength and elongation are increasing accordingly. In order to ensure the discharge elongation of the existi...

AI Technical Summary

Problems solved by technology

[0005] 1. The tensile strength and elongation cannot meet the needs of the existing aluminum foil for high-end lithium batteries, and the tensile strength of most thin lithium batteries cannot reach ≥250N / mm 2 requirements, the elongation rate is more difficult to ensure more than 2.5%;

[0006] 2. The flatness of the thin lithium double-sided light lithium battery aluminum foil (<15u) is generally poor in some parts, which has brought great quality hidden dangers to downstream battery foil users, leading to feedback and complaints from upstream manufacturers that the number of returns is relatively low Big

[0007] These problems make the yield of aluminum foil for lithium batteries low, the production cost is high, and the risk of enterprise development increases. The supply of aluminum foil exceeds the demand, there is a price but no stock

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