Process for producing battery aluminium foil

Abstract

The invention discloses a process for producing a battery aluminium foil. The process comprises the following steps of: (1), carrying out casting and rolling production by selecting 1070 alloyed scrap of which the scrap ratio is not more than 35%, and the rest of pure aluminium ingot to obtain a casting-rolling blank; (2), coldly rolling the casting-rolling blank to obtain an aluminium alloy belt material; (3), carrying out heat preservation on the aluminium alloy belt material at 500-560 DEG C for 8.5-9.5 hours, and intermediately annealing at 400-440 DEG C for 1.5-2.5 hours, wherein the thickness of the aluminium alloy belt material during intermediate annealing is 1.8 millimeters; and (4), rolling the intermediately annealed aluminium alloy belt material into a product with the thickness of a finished product. According to the process, the total processing rate after the intermediate annealing is increased; the work-hardening capacity of the material is enhanced; and therefore, the intensity index of the product is increased; in addition, because the annealing and temperature-increasing time is prolonged, the uniformity of the internal organization of the material is beneficial to being increased; and the process is relatively beneficial to processing of subsequent processes and the stability of the product quality.

Description

technical field [0001] The invention relates to the technical field of aluminum foil for batteries, and more specifically, relates to a production process of aluminum foil for batteries. Background technique [0002] Aluminum foil products are widely used, from medicine, flexible packaging to cardboard, cigarette packaging, from wine labels, tubes to air conditioners, electronics, to containers, and household use. It can be said that with the development of the economy, aluminum foil has gradually penetrated into all walks of life. industry and our daily production. In recent years, with the rapid development of the electronics industry, the application of aluminum foil products in the electronics industry has begun to increase. Among them, with the rapid development of the domestic electronics industry and the electric vehicle industry, the demand for various types of batteries is also increasing year by year, followed by the continuous increase in demand for related produ...

AI Technical Summary

Problems solved by technology

[0006] 1. Due to the high purity of 1070 alloy aluminum, it will be more difficult to refine the grains during the casting and rolling production process, and the probability of producing coarse grains will increase, which is not conducive to the surface quality control of subsequent aluminum foil products;

[0007] 2. Due to the high purity of 1070 alloy aluminum and the low content of alloy elements in the product, the product strength index is low, generally 140-160Mpa, while for battery foil products, high-end customers require the strength index of the product to be above 180Mpa;

[0008] 3. Affected by the internal structure of the product, the ductility of the product is lower than that of other alloys, which makes the processing of the subsequent process difficult, and the control of the shape quality and surface quality of the product increases.

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