| abstract |
The invention provides an aluminum alloy plate for a battery cover and a manufacturing method thereof. The aluminum alloy plate for a battery cover is excellent in heat release, formability and processing softening, and can be used to form small variations in operating pressure and excellent resistance to repeated fatigue characteristics One type explosion-proof valve.nAn aluminum alloy plate for a battery cover for forming an integral explosion-proof valve, characterized in that it has the following composition: containing Fe: 1.05 to 1.50 mass%, Mn: 0.15 to 0.70 mass%, and Ti: 0.002 to 0.15 mass% And B: less than 0.03% by mass, the remaining part is composed of Al and impurities, the Fe/Mn ratio is limited to 1.8 to 7.0, and Si as an impurity is limited to less than 0.40% by mass, Cu is less than 0.03% by mass, Mg is less than 0.05% by mass and V is less than 0.03% by mass; the aforementioned aluminum alloy plate for battery cover has a conductivity of 53.0% IACS or more, an elongation value of 40% or more, and a recrystallized structure, and, when cold rolling is performed at a reduction rate of 70% After the tensile strength is defined as TS70, and the cold-rolling tensile strength of 95% is defined as TS95, the value of (TS95-TS70) is less than -1MPa, and the cold shrinkage is 90% The value of elongation after rolling is 5.0% or more. In addition, the average crystal grain size of the recrystallized grains in the recrystallized structure is preferably 15 to 30 μm. |