PRODUCTION OF LOW WARPING ALUMINUM FOIL FOR LITHIUM BATTERY SMALL IN DISTORTION

PROBLEM TO BE SOLVED: To obtain a flat and low warping Al foil for a lithium battery by subjecting an Al hard foil subjected to foil rolling to a shape modifying process by applying tension after heat treatment or in the same stage of the heat treatment and stretching the foil by a specified amt. SO...

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Bibliographische Detailangaben
Hauptverfasser:	MIYANO KOJI, FUKUDA AKIO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY PUNCHING METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a flat and low warping Al foil for a lithium battery by subjecting an Al hard foil subjected to foil rolling to a shape modifying process by applying tension after heat treatment or in the same stage of the heat treatment and stretching the foil by a specified amt. SOLUTION: So as to stretch the Al hard foil by 0.5 to 2% without breaking in a shape modifying stage, the Al foil is subjected to heat treatment before the shape modifying stage or in the same stage of the shape modifying and is softened. Preferably, heat treatment is executed so as to secure about 3% elongation as the physical value of the Al foil. The Al hard foil shall be produced by the successive execution of hot rolling, cold rolling and foil rolling in accordance with the ordinary methods. Moreover, the thickness of the Al hard foil shall be set to 10 to 40 μm, particularly to 10 to 20 μm. In this way, the flat Al foil for a lithium battery small in distortion can be obtd.