BATTERY-CASE ALUMINIUM ALLOY PLATE EXHIBITING EXCELLENT MOULDING PROPERTIES, HEAT-DISSIPATION PROPERTIES, AND WELDING PROPERTIES

摘要

Provided is a 3000 series aluminium alloy plate which exhibits heat-dissipation characteristics applicable to large lithium ion battery containers, and which also exhibits excellent moulding properties, shape fixability, and laser welding properties. This aluminium alloy plate is a cold-rolled annealed material which has: a component composition including over 0.2 mass% but less than 1.4 mass% of Fe, 0.5-2.0 mass% of Mn, over 0.2 mass% but not more than 1.1 mass% of Si, 0.05-1.0 mass% of Cu, and less than 0.05 mass% of Mg, the remainder comprising Al and impurities; a conductivity of over 45% IACS; a metallographic structure in which the number of second phase particles having an equivalent circular diameter of at least 2 µm is less than 1800/mm2; a 0.2% proof stress of at least 30 MPa but less than 85 MPa; and an elongation value of at least 10%. Otherwise, this aluminium alloy plate is a cold-rolled material which has: a conductivity of over 45% IACS; a metallographic structure in which the number of second phase particles having an equivalent circular diameter of at least 2 µm is less than 1800/mm2; a 0.2% proof stress of at least 90 MPa but less than 180 MPa; and an elongation value of at least 3%.