| abstract |
The present invention provides an Al-Fe based aluminum alloy sheet having sufficiently high strength for application as a large lithium-ion battery container, as well as good moldability and good laser weldability. The cold-rolled aluminum alloy sheet has an elongation of 2% or more and tensile strength of 160 MPa or more, and has: a chemical composition comprising 0.3 to 1.5 mass% Fe, 0.3 to 1.0 mass% Mn, 0.2 to 1.0 mass% Cu, 0.2 to 1.0 mass% Mg, 0.002 to 0.20 mass% Ti, and 0.05 to 0.20 mass% Zr, with an Mn/Fe mass ratio of 0.2 to 1.0, and the remainder comprising Al and inevitable impurities, such inevitable impurities comprising less than 0.30 mass% Si; and a metallographic structure in which the number of second-phase particles with an equivalent circle diameter of 5 μm or more is less than 500/mm 2 . Alternatively, the aluminum alloy sheet is a cold-rolled annealed material having an elongation of 20% or more and tensile strength of 130 MPa or more. |