| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of wrinkles or the like due to separation of an insulation film from a battery case at the boundary between a plane part and a corner part of the battery case or at the vicinity of the boundary.SOLUTION: An outside surface of a battery case includes a plane part 21 and a corner part 22, and an end part of an isolation film 3 provided on the outside surface of the battery case is directed in a direction parallel with the plane part 21. |
