ALUMINUM CAN FOR SECONDARY BATTERY, AND METHOD FOR PRODUCING SAME

摘要

An aluminum can for a secondary battery, which is produced by assembling a lid comprising an aluminum alloy sheet and an outer package together by laser beam welding; and a method for producing the aluminum can. Alloy steel sheets, i.e., a first alloy sheet and a second alloy sheet, each comprising an aluminum alloy containing at least 0.30% by mass or less of Si and 2 to 30 ppm by mass of B are prepared. The first alloy sheet and the second alloy sheet are butted against each other in such a manner that the edge face of the second alloy sheet is butted along the side edge of the first alloy sheet. The resultant product is subjected to continuous laser beam welding along a butt line that is formed on the edge face of the first alloy sheet. The conditions for the laser beam welding are so adjusted that the ratio of the width (W) of a melt-joined part that is provided through the butt line to the depth (D) of the melt-joined part becomes 1.5 or more and the melt-joined part can have a depth (D) of 0.35 mm or more.