| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery suitable for a portable information terminal or a wearable device or to provide an electronic device having various appearance configurations and a new structure and a secondary battery suitable for the appearance configurations.SOLUTION: A secondary battery is sealed by using a film having recessed parts or protruding parts for relaxing stress of the film that is generated by an external force being applied thereto. A pattern comprising the recessed parts or the protruding parts is formed in the film by press working, for example, embossing.SELECTED DRAWING: Figure 8 |
