| 摘要 |
Provided are a sealed battery provided with a safety valve part having a sufficiently large opening area when open, and a method of producing such a sealed battery. The sealed battery is provided with an electric power generating element and a battery case having a safety valve part at a valve forming surface. The safety valve part has a thin-walled portion breaking when the safety valve part becomes open. The thin-walled portion has first to n-th linear thin-walled portions. The first to n-th linear thin-walled portions include an intersecting thin-walled portion. The thin-walled portion is adapted such that the breaking pressure of the intersecting thin-walled portion is lower than the breaking pressure of portions other than the intersecting thin-walled portion. |
