Production technology for 1070A alloy aluminum foil with ultrahigh strength and high elongation for lithium battery

Abstract

The invention relates to a production technology for 1070A alloy aluminum foil with the ultrahigh strength and the high elongation for a lithium battery. The aluminum foil for the lithium battery comprises, by mass percentage, less than or equal to 0.2% of Fe; less than or equal to 0.1% of Si, less than or equal to 0.1% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.03% of Mg, less than or equal to 0.03% of Zn, less than or equal to 0.04% of Ti, and greater than or equal to 99% of Al. The preparation method comprises the steps of (1) smelting, and cast rolling; (2) cold rolling; and (3) aluminum foil rolling, specifically, cutting a aluminum foil coil to obtain the finished aluminum foil for the lithium battery. The production technology has the beneficial effects that a newly improved 1070A alloy is adopted, the proportion is reasonable, an electrolytic aluminum liquid with the high purity is adopted, a novel tubular filter box is adopted for production in the cast rolling process, the technology is scientific, the mechanical performance indexes of products can be improved, the tensile strength and the elongation of the products are higher than those of similar products in China, and the use requirements of customers can be met.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and in particular relates to a production process of aluminum foil for lithium batteries with ultra-high strength and high elongation of 1070A alloy. Background technique [0002] With the continuous development of new energy vehicles and mopeds, the requirements for battery performance continue to increase. As aluminum foil in the positive electrode material, the purity of aluminum has a certain impact on the life, consistency and rate discharge performance of lithium-ion batteries; Under the premise of aluminum purity, improving the tensile strength and elongation can also increase the rate discharge performance of the battery. At present, the tensile strength of the battery aluminum foil of the domestic 1070A alloy is generally between 170 and 220Mpa, and the elongation is between 1.5 and 2.5%. The tensile strength and elongation are not high. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of new energy vehicles and mopeds, the requirements for battery performance continue to increase. As aluminum foil in the positive electrode material, the purity of aluminum has a certain impact on the life, consistency and rate discharge performance of lithium-ion batteries; Under the premise of aluminum purity, improving the tensile strength and elongation can also increase the rate discharge performance of the battery. At present, the tensile strength of the battery aluminum foil of the domestic 1070A alloy is generally between 170 and 220Mpa, and the elongation is between 1.5 and 2.5%. Low tensile strength and elongation