US Patent 8729866 Sulfide-based all-solid-state lithium secondary battery system

In an all-solid-state lithium secondary battery provided with a sulfide-based electrolyte-containing layer, the production of hydrogen sulfide is effectively inhibited without deteriorating battery characteristics. A battery system (100) is provided with: an all-solid-state lithium secondary battery (1) using a sulfide-based solid electrolyte material; and a reducing device (2, 3, 5) for reducing a charge-discharge amount of the all-solid-state lithium secondary battery if a temperature in an inside of the all-solid-state lithium secondary battery reaches a first threshold value.