| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for battery case excellent in formability and weldability to be used for a rithium battery case, small in deformation even in the case the internal pressure of the case is increased and high in strength. SOLUTION: This aluminum alloy sheet for battery case has a composition containing, by weight, 0.05 to 0.3% Cu, 0.3 to 1.0% Mg and 0.6 to 1.5% Mn, moreover containing one or more kinds of Si and Fe by 0.1 to 1.0%, and the balance aluminum with inevitable impurities. The aluminum alloy sheet is subjected to cold rolling at a working ratio of 30 to 60%, the average crystal grain size obtained by a cutting method is <=30μm, and the area occupancy ratio of intermetallic compounds on the surface obtained by the image analysis of an observed picture in a scanning type electron microscope is 1.0 to 5.0%.
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