| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for a battery case, which is superior in formability, pulse laser weldability, strength and pressure resistance (swelling resistance); a manufacturing method therefor; and the battery case which uses the aluminum alloy sheet for the battery case. SOLUTION: The aluminum alloy sheet for the battery case comprises, by mass%, 0.4-1.5% Mn, 0.7-4.0% Cu, 0.2-1.5% Mg, 0.05-1.0% Si, 0.05-1.0% Fe, and the balance Al with unavoidable impurities. The composition of the unavoidable impurities is controlled to, by mass, 0.3% or less Zn, less than 0.02% Ti and 20 ppm or less B. In the central part in the sheet thickness direction of a cross-section of the aluminum alloy sheet, an area rate of intermetallic compounds with the maximum length of 1μm or more is more than 0.3% but less than 2.1%, and the number of the intermetallic compounds with the maximum length of 11μm or more is 140 pieces/mm<SP>2</SP>or less. COPYRIGHT: (C)2011,JPO&INPIT
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