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Cold-rolled strip for new energy battery aluminum-plastic film aluminum foil and preparation method thereof

A cold-rolled strip and aluminum-plastic film technology, applied in the field of aluminum alloy materials, can solve the problems of incomplete crushing, inability to use aluminum foil, and pinholes, etc., to achieve uniform and smooth surface quality, good sealing and formability, and good Effects of Strength and Elongation

Active Publication Date: 2020-12-25
CHINALCO SOUTHEAST MATERIALS (FUJIAN) TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the aluminum alloy strip is calculated by mass percentage: Si: 0.064wt%; Fe: 1.458wt%; Ti: 0.010wt%; V: 0.004%; the balance is aluminum and unavoidable impurities.

[0025] A method for preparing a cold-rolled strip for a new energy battery aluminum-plastic film aluminum foil comprises the following steps:

[0026] 1) At a temperature of 729°C, use Al-Fe master alloy and Al-Si master alloy ingredients to obtain a melt whose composition meets the requirements, after KCl and MgCl 2 After the particles are refined and slag removed, they are transferred to the holding furnace. During the conversion process, the heat-retaining furnace bottom ventilation bricks are used to spray argon for refining, and the refining lasts until 20 minutes after the completion of the converter.

[0027] 2) After the molten aluminum is left to stand for 40 minutes, it is filtered through a 30-mesh plus 50-mesh double-stage foam ceramic filter plate, and then refined by blowing...

Embodiment 2

[0035]The composition of the aluminum alloy strip is calculated by mass percentage: Si: 0.066wt%; Fe: 1.033wt%; Ti: 0.011wt%, V: 0.008%; the balance is aluminum and unavoidable impurities.

[0036] A method for preparing a cold-rolled strip for a new energy battery aluminum-plastic film aluminum foil comprises the following steps:

[0037] 1) At a temperature of 732°C, using Al-Fe master alloy and Al-Si master alloy ingredients to obtain a melt whose composition meets the requirements, after KCl and MgCl 2 After the particles are refined and slag removed, they are transferred to the holding furnace. During the conversion process, argon gas injection is used to spray the heat-retaining furnace bottom ventilation bricks for refining, which lasts until 10 minutes after the completion of the conversion furnace.

[0038] 2) After standing for 1 hour, the molten aluminum is filtered through a 60-mesh single-stage foam ceramic plate, then passed through a double-rotor degassing furna...

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Abstract

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. Semi-continuous casting of aluminum ingots after smelting and refining, heat preservation and refining, multi-pass degassing, and multi-stage filtration; heat preservation and homogenization heat treatment for ingots after sawing and face milling; hot rolling after being released from the furnace, and then cold Rolling, cleaning and then annealing in the middle; finally cold rolling and trimming to obtain the cold-rolled strip blank for aluminum-plastic film and aluminum foil. The cold-rolled strip of the present invention has a clean surface and internal structure, no coarse mesophase compounds, no pinholes after being rolled to an aluminum foil thickness of 20 μm to 40 μm for aluminum-plastic films, and satisfies the barrier properties, cold stamping formability, and Application requirements in terms of puncture resistance, chemical stability and insulation.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/00C22F1/04H01M2/02H01M10/0525H01M50/116
CPCH01M10/0525C22C1/026C22C1/03C22C21/00C22F1/04H01M50/116Y02E60/10
Inventor 刘旺黄瑞银徐始祥饶聪冉继龙吴永喜
Owner CHINALCO SOUTHEAST MATERIALS (FUJIAN) TECH CO LTD
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