Cold-rolled strip for new energy battery aluminum-plastic film aluminum foil, and preparing method of cold-rolled strip

Abstract

The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a cold-rolled strip for a new energy battery aluminum-plastic film aluminum foil, and a preparingmethod of the cold-rolled strip. An aluminum ingot is subjected to semi-continuous casting after smelting and refining, heat-insulation still standing and refining, multi-pass degassing and multi-stage filtration; the cast ingot is subjected to heat-insulation homogenization heat treatment after being subjected to sawing and face-milling; the cast ingot is taken out of a furnace, subjected to hotrolling, then subjected to cold rolling, cleaning and intermediate annealing; and finally cold rolling is conducted, and a cold-rolled strip blank for the aluminum-plastic film aluminum foil is obtained after edge cutting. The cold-rolled strip has the clean surface and internal texture and has no thick and big mesophase compounds, no pinhole is generated after rolling is conducted till the thickness of the aluminum foil for an aluminum-plastic film reaches 20 to 40 [mu]m, and the use demands of the aluminum-plastic film in the aspects of the barrier property, the cold stamping forming property, puncture resistance, chemical stability and insulativity are met.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and in particular relates to a cold-rolled strip for new energy battery aluminum-plastic film aluminum foil and a preparation method thereof. Background technique [0002] Driven by the increase in sales of new energy vehicles, battery replacement, replacement of lead-acid batteries with lithium batteries, and the pull of the export market, power batteries will be the largest driving engine for the future growth of lithium batteries in China. At present, there are three main types of commercial lithium-ion battery packaging: aluminum-plastic film soft package, square hard case, and cylindrical hard case. The development prospect of soft-pack batteries is better, mainly because their energy density and safety are better than those of hard-shell batteries. In view of the advantages of soft-pack batteries, their penetration rate in the new energy vehicle market is increasing, and t...

AI Technical Summary

Problems solved by technology

This method is easy to produce center layer segregation when producing 5.0~10.0mm billets, because of the solidification method, the coarse mesophase compound gathers in the center layer of the strip, which cannot be completely broken after cold rolling, and pinholes are easily caused after thinning

In addition, when the billet is produced by this method, the molten aluminum oxide film in the gap between the feed nozzle and the roll may occasionally be brought into the surface of the plate, and the lubricating carbon black on the rolls of the twin-roll continuous casting and rolling mill is also easily pressed into the surface of the plate, which may cause Pinholes after rolling

The cold-rolled strip produced by this method is feasible for food foils that allow a certain number of pinholes, but it cannot be used for aluminum foils for new energy batteries that do not allow pinholes.