| 摘要 |
PURPOSE:To make it possible to obtain a secure sealing condition of a cell by using a cell container which is formed by a formation method including an ironing process, and sealing up the connection between the outer peripheral edge of a lid body and the aperature edge of the cell container in a laser welding. CONSTITUTION:While forming a square container, which is formed preliminarily by a deep drawing process out of a steel plate or the like, in a specific size and dimensions in an ironing process, a cutting step 1d is formed at the inside edge of the aperature. On the cutting step 1d of the square cell container 1, a lid body 3, whose peripheral edge formed by a press punching is plain, is engaged and loaded, and the connection 6 between the outer peripheral edge of the lid body 3 and the aperature edge of the cell container 1 is welded with laser beams to form a weld 8 to seal up the cell. As a result, the reliability and the productivity of the weld in a laser welding can be improved. |
