Aluminum foil for aluminum plastic film of lithium battery and manufacturing process of aluminum foil

Abstract

The invention belongs to the technical field of aluminum alloy materials, and relates to an aluminum foil for an aluminum plastic film of a lithium battery and a manufacturing process of the aluminumfoil. The aluminum foil comprises the following components in percentage by mass: 0.08% of Si, 1.35-1.45% of Fe, 0.03% of Cu, 0.03% of Mn, 0.01% of Mg; 0.03% of Zn, 0.03% of Cr, 0.01-0.03% of Ti, andthe balance Al and other unavoidable impurity elements. The manufacturing process comprises the steps of rough rolling, middle rolling, coiling, finish rolling, slitting and annealing. According to the aluminum foil and the manufacturing method, the improved 8021 alloy is adopted, the alloy element proportion is reasonable, the 8021 alloy is adopted to be adjusted in the alloy components within the national standard range, and four passes of high-speed rolling with large reduction amount is adopted during aluminum foil rolling; and medium-high temperature annealing is adopted, so that the deepdrawing performance and the water brushing A-level effect of the product are guaranteed. The manufactured aluminum foil is high in elongation rate, good in corrosion resistance, low in oxygen permeability and moisture permeability and high in composite strength, and capable of meeting the use requirements of the aluminum plastic film of the lithium battery on the aluminum foil.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and relates to an aluminum foil for an aluminum-plastic film of a lithium battery and a preparation process thereof. Background technique [0002] With the rapid popularization and development of new energy vehicles, the requirements for safety, weight and capacity are getting higher and higher, so the requirements for improving the safety of lithium batteries are becoming more and more urgent. Soft-pack lithium batteries are widely used in consumer electronics, automobiles, military, medical, power tools and other industries due to their advantages of good safety performance, light weight, large capacity, low internal resistance, and flexible design. The essence of the soft-pack lithium battery is actually a liquid lithium-ion battery covered with a polymer shell, and its performance is so excellent, the most important thing is the aluminum-plastic film in the polymer shell, and...

AI Technical Summary

Problems solved by technology

[0003] At present, the performance of aluminum foil products for aluminum-plastic film for lithium batteries in my country, only a few technical indicators of enterprises can reach the level of Japanese companies. The depth is about 5mm, and the foreign ones are 8mm, even up to 15mm. There is still a certain gap between the overall and foreign products.