| 摘要 |
An aluminum alloy plate for a battery case and a manufacturing method thereof are provided to obtain desired internal pressure strength, reduce a deviation of internal pressure strength, and form a thin explosion-proof part accurately by forming the aluminum alloy plate with fine crystal grains. An aluminum alloy plate for a battery case(2) comprises Fe : 1.15 to 1.35 weight%, Mn : 0.40 to 0.60 weight%, the remainder Al, and unavoidable impurities. The aluminum alloy plate has a composition having, as the impurities, less than 0.05 weight% of Si, less than 0.05 weight% of Mg, and less than 0.05 weight% of Mg. The aluminum alloy plate has a structure in which a maximum width of a crystal grain is less than 100 ‘í and an average of a width of the crystal grain is less than 25 ‘í with regard to a direction perpendicular to the rolling direction. Ti : 0.005 to 0.15 weight% and B : 0.0005 to 0.05 weight% are contained. |
