| 摘要 |
The present invention provides a secondary battery, suitable for a wearable device or a portable information terminal, or an electronic device with a new structure having various appearances, and a secondary battery, suitable for the appearances. The secondary battery is sealed by using a film including a convex part to relieve stress to the film, caused by external force. A pattern, comprising the convex part, is formed on the film by press processing, for example embossing processing. The top of the convex part has a thicker area than the bottom of the convex part. The thickness of the top of the convex part is 1.5 times, advisably, two times thicker than the bottom of the convex part, and is not thicker than thickness to have a convex space in the convex part. |
