NOVELTY - An aluminum alloy plate comprises aluminum alloy comprising 0.8-2 %mass iron, 0.03-0.2 %mass silicon, 0-1 %mass copper, 0.004-0.05 %mass titanium, 0.02 %mass or less magnesium, 0.02 %mass or less manganese, and remainder of aluminum and unavoidable impurities. In a metallographic structure up to a depth of 5 mm or more in the sheet-thickness direction from the surface of the aluminum alloy sheet having final sheet thickness, the average circle-equivalent diameter of aluminum-iron-based intermetallic compounds having circle-equivalent diameter of 1-16 mm, is 1.3-1.9 mm.    USE - Aluminum alloy plate is used for cases of battery e.g. lithium ion battery. Uses include but are not limited to motor vehicles, mobile telephones, digital camera, and notebook-type personal computer.    ADVANTAGE - The aluminum alloy plate has excellent laser weldability, formability, and corrosion resistance after long storing for long period of time, and can be manufactured efficiently and reliably with high yield.    DETAILED DESCRIPTION - An aluminum alloy plate comprises aluminum alloy comprising 0.8-2 %mass iron, 0.03-0.2 %mass silicon, 0-1 %mass copper, 0.004-0.05 %mass titanium, 0.02 %mass or less magnesium, 0.02 %mass or less manganese, and remainder of aluminum and unavoidable impurities. In a metallographic structure up to a depth of 5 mm or more in the sheet-thickness direction from the surface of the aluminum alloy sheet having final sheet thickness, the average circle-equivalent diameter of aluminum-iron-based intermetallic compounds having circle-equivalent diameter of 1-16 mm, is 1.3-1.9 mm. The coefficient of variation of circle-equivalent diameter is 0.55 or less. The average number density of aluminum-iron-based intermetallic compound is 20-150/2500 mm2. The coefficient of variation of number density is 0.3 or less. An INDEPENDENT CLAIM is included for manufacture of aluminum alloy plate.    DESCRIPTION OF DRAWING(S) - The drawing shows the graph of direct chill casting process, and change of the solidification rate in DC ingot cross section