| 摘要 |
PURPOSE:To improve and stabilize fitting precision by using a squeezing process to mold a metallic plate and next using a drawing process to arrange its shape so that a squared battery container and a cover plate with rising parts can be manufactured. CONSTITUTION:A steel plate as an element one is molded into a rectangular squared container 1' by a squeezing process. Next, similarly with a battery container 1, the squeezing process is used to mold the steel plate into a cover plate 3'. Next a drawing processing mold is used to perform a drawing process and obtain a rectangular cover plate 3. When the battery container 1 and the cover plate 3 are fitted with each other, a gap generated at a junction part 5a can be made to be 0.03 to 0.07 mm or less in the case of a small-sized battery, so that the following one condition for laser welding; the gap should be 0.1 mm or less, can be satisfied. |
