Aluminum foil for ultrathin high-strength 10 [mu] m double-sided light lithium battery and production process of aluminum foil

Abstract

According to the aluminum foil for the ultrathin high-strength 10-micron double-sided light lithium battery and the production process of the aluminum foil, the optimal process route of the aluminum foil for the 10-micron double-sided light lithium battery is determined by controlling blank casting chemical components, improving a hot rolling production process and a cold rolling production process and performing groping tests on an aluminum foil rolling process, a slitting process and a corona process; according to the aluminum foil manufactured through the technology, the thickness is 10 microns, the tensile strength is larger than or equal to 260 Mpa, the ductility is 2% or above, the plate shape collapse amount is smaller than or equal to 8 mm, the surface wettability is larger than or equal to 33 Dyne, the product surface quality, the plate shape quality, the trimming quality and the surface wettability are excellent, the requirements of domestic and overseas high-end battery foil customers are met, the technology is reliable, production is stable, and the domestic advanced level is achieved.

Description

technical field [0001] The invention relates to the technical field of soft pack battery packaging, in particular to an ultra-thin and high-strength 10 μm double-sided aluminum foil for lithium batteries and a production process thereof. Background technique [0002] Aluminum foil for batteries refers to aluminum foil products used for lithium-ion battery cathode materials. In batteries, aluminum foil has many uses, such as carbon-coated foil, light foil, battery aluminum casing, electro-etching foil, tabs, etc. The most common application is In 3C digital, energy storage, electric vehicles and other fields. Aluminum foil for batteries is different from general-purpose aluminum foil products. It requires the product to have good mechanical properties, good surface quality, and high electrical conductivity. In 2020, domestic battery foil shipments will be 60,000 tons, a year-on-year increase of 16%, and the shipments in 2021 are expected to be 120,000 tons. With the rapid d...

AI Technical Summary

Problems solved by technology

[0027] 1. The ultra-thin double-sided aluminum foil exceeds the limit range of the rolling mill. It is difficult to bite into the production process, and it is easy to break the strip. It puts high demands on the machine and the operator, and it is difficult to stabilize the production due to poor control.

[0028] 2. The composition of 1100 alloy is basically controlled according to the national standard, and the range is relatively large. It is difficult to control the production of 0.01mm double-sided optical products, and the stability cannot be guaranteed.

[0029] 3. The surface quality and shape quality of the aluminum foil produced by the existing technology are poor, the tensile strength is 250-260Mpa, the shape width is ≤10mm, and the surface wettability is ≥28Dyne;

[0030] 4. The application of 10μm aluminum foil on the power battery requires high safety and consistency. The aluminum scrap generated during the cutting process of the aluminum foil will cause short circuit of the battery. During the cutting process, the Lutz blade is passive, and there will be cracks, gaps and burrs on the cutting edge

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