POWER STORAGE ELEMENT, POWER STORAGE CELL, AND STORAGE DISCHARGE SYSTEM

This power storage element comprises: a positive electrode having a positive electrode collector and an active material layer; a negative electrode having a negative electrode collector and an activematerial layer; a separator sandwiched between the positive electrode and the negative electrode; a first terminal for charging, the first terminal being connected to the outer periphery of the positive electrode collector; a second terminal used in charging and/or discharging, the second terminal being connected to the outer periphery of the negative electrode collector; and a third terminal fordischarge, the third terminal being connected to the outer periphery of either the positive electrode collector or the negative electrode collector, and moreover being connected so as to be set apartfrom the first terminal or the second terminal. 该蓄电元件具备：具有正极集电体和活性物质层的正极，具有负极集电体和活性物质层的负极，被所述正极和所述负极夹持的隔膜，与所述正极集电体的外周连接的充电用的第一端子，与所述负极集电体的外周连接、充电和放电中的至少一者使用的第二端子，以及与所述第一端子或所述第二端子分离地连接于所述正极集电体和所述负极集电体中的一者的外周的放电用的第三端子。