| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem, wherein due to contact between a grooving roller and a battery case, abrasion of the grooving roller is caused, and the lifetime of the grooving roller becomes short, suppress contact between the battery case 1 and the grooving roller, and achieve long lifetime for of the grooving roller in a grooving work of forming an annular groove part inward by pushing the grooving roller into the battery case. SOLUTION: This nonaqueous secondary battery has an annular groove part 10 of a structure, having a cross-sectional shape having a continuous part of R from the deepest part to an electrode group side, and in which by reducing contact between the grooving roller used for grooving work to form the annular groove part 10 and the battery case 1, abrasion of the grooving roller is prevented, and long lifetime is achieved. COPYRIGHT: (C)2009,JPO&INPIT
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