| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrochemical device capable of expanding a liquid chamber volume without increasing the size thereof.SOLUTION: An electrochemical device includes a case 11, a welding ring 18 and a lid 12. The case 11 has a bottom 11a and a wall 11b with a frame shape along the outer periphery of the bottom 11a and having a joined surface on the opposite side to the bottom 11a. The welding ring 18 is a welding ring joined to the joined surface, and has a contact region in contact with the joined surface and a non-contact region having a curved surface continuous to the contact region and not in contact with the joined surface. The lid 12 is welded to the welding ring 18, and forms a liquid chamber R together with the case 11 and the welding ring 18. |
