| abstract |
(57) [Abstract] [Problem] It is lightweight and thin, has no liquid leakage, has excellent stability, Provision of high capacity secondary batteries. 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. A secondary battery in which a sealed battery element is housed in a housing member, wherein the height of the gap of the battery element housing portion of the housing member is set to 101 to 120% of the total thickness of the battery element. . |