SECONDARY BATTERY SYSTEM

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An object of the present disclosure is to provide a secondary battery system that functions at high voltage. The present disclosure attains the object by providing a secondary battery system comprising : a fluoride ion battery including a cathode active material layer, an anode active material layer, and an electrolyte layer formed between the cathode active material layer and the anode active material layer; and a controlling portion that controls charging and discharging of the fluoride ion battery; characterized in that the cathode active material layer contains a cathode active material with a crystal phase that has a Perovskite layered structnre and is represented by A n+1 B n O ´n+1-± F x (A comprises at least one of an alkali earth metal element and a rare earth element; B comprises at least one of Mn, Co, Ti, Cr, Fe, Cu, Zn, V, Ni, Zr, Nb, Mo, Ru, Pd, W, Re, Bi, and Sb; "n" is 1 or 2; "±" satisfies 0 ‰¤ ± ‰¤ 3.5; and "x" satisfies 0 ‰¤ x ‰¤ 5.5) ; and the controlling portion controls charging so that a value of F/B in the cathode active material becomes more than 2/n that is in an over-charged state