| 摘要 |
A safety device for an enclosed cell. A closure anti-explosion valve of a flat metal sheet which is deformable upon a pressure rise inside the cell has a valve body dent 9 formed in the centre and protruding toward an inner cover 3. The surrounding wall of the dent 9 is partly reduced in thickness to form a thin-walled portion 1a around the dent, and the dent portion is joined to the inner cover 3 having gas inlet holes 3a at a weld 1c. The surface of the closure anti-explosion valve 1 has a plurality of valve body thin-walled portions 1b radially extending from the dent 9. Nicks 8 are formed on the upper or under side of the flat sheet part of the closure anti-explosion valve, among the valve body thin-walled portions 1b. |
