| abstract |
(57) [Summary] [PROBLEMS] To provide a secondary battery that is lightweight and thin, has no leakage, is excellent in stability and durability, and has a high electric capacity. SOLUTION: A positive electrode material and a negative electrode material electrically connected to a current collector are laminated via a non-fluid electrolyte layer, and a battery element containing an ionic metal component is covered with a flexible covering material. In the sealed secondary battery, the battery element A secondary battery characterized by being sealed with a covering material so that it can expand by 50%. |