| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having a simple structure and high safety by providing a groove having the depth corresponding to the specific range % of the thickness of a positive electrode plate around the junction of the positive electrode plate connected to a positive electrode lead. SOLUTION: This nonaqueous secondary battery is provided with a negative electrode can 1, a positive electrode plate 2, and a packing 3 insulating the negative electrode can 1 from the positive electrode plate 2 and interrupting the battery interior from the battery outside. A groove 7 is dug around a junction to a positive electrode lead 6 on the positive electrode plate 2. The depth of the groove 7 is preferably set to 50-70% of the thickness of the positive electrode plate 2. When the battery internal pressure increases, the portion of the groove 7 can be easily and safely cut to release the increased pressure to the outside, the connection to the positive electrode lead 6 is cut off, and the current can be interrupted. |
