| 摘要 |
A battery container (10) comprises a case member (1) which is opened on one end, and a sealing member (2) for closing the opening. The case member (1) and the sealing member (2) are brought into contact, a welding beam is projected, welding a weld part (13) thereupon, and an underfill part (24) is formed in the vicinity thereof. The case member (1) and the sealing member (2) are welded such that the weld part (13) reaches the underfill part (24). It would be permissible for the width of the underfill part (24) in the direction of the projection of the welding beam to be 1/3 or more of the melt depth of the weld part (13). |
