PROBLEM TO BE SOLVED: To improve safety of a battery device by forcing the battery to discharge when electric power remains in a used thin battery.SOLUTION: The battery device comprises a thin battery including: a sheet-like electrode group comprising a first electrode, a second electrode and an electrolyte intercalated between the first electrode and the second electrode and an exterior body for sealing and housing the electrode group, and has a compulsive discharge operation switch for switching states between a state in which the first electrode and the second electrode are in an external short circuit and a state in which the first electrode and the second electrode are not in the external short circuit.COPYRIGHT: (C)2013,JPO&INPIT【課題】使用後の薄型電池に電力が残存している場合に、電池を強制放電させることにより、電池デバイスの安全性を向上させる。【解決手段】第1電極、第2電極および第1電極と第2電極との間に介在する電解質層を具備するシート状の電極群と、電極群を密閉収納する外装体と、を含む薄型電池を具備し、第1電極と第2電極とが外部短絡した状態と、第1電極と第2電極とが外部短絡していない状態とを切り替えるための強制放電作動スイッチを有する、電池デバイス。【選択図】図7
