| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for a battery case excellent in formability, pulse laser weldability, strength and pressure resistance (swelling resistance), a method of manufacturing the aluminum alloy sheet for the battery case, and a battery case using the aluminum alloy sheet for the battery case.SOLUTION: In an aluminum alloy sheet for a battery case containing Mn:0.4 to 1.5 mass%, Cu:0.7 to 4.0 mass%, Mg:0.2 to 1.5 mass%, Si:0.05 to 1.0 mass%, Fe:0.05 to 1.0 mass% and the balance Al with inevitable impurities, the inevitable impurities contains Zn:0.3 mass % or less, Ti: less than 0.02 mass% and B:20 mass ppm or less, and an area ratio of an intermetallic compound having a maximum length of 1 μm or more is greater than 0.3% and less than 2.1%, and the number of the intermetallic compounds having the maximum length of 11 μm or more is 140 pieces/mmor less in a thickness direction center part of a cross section of the aluminum alloy sheet. |
