| abstract |
A secondary battery having high heat dissipation ability is provided. A secondary battery including a plurality of positive electrodes and a plurality of negative electrodes in an outer package, wherein the plurality of positive electrodes are connected to each other outside the outer package without being connected to each other inside the outer package, or wherein the plurality of negative electrodes are connected to each other outside the outer package without being connected to each other inside the outer package, or wherein the plurality of positive electrodes are connected to each other outside the outer package without being connected to each other inside the outer package and the plurality of negative electrodes are connected to each other outside the outer package without being connected to each other inside the outer package. In addition, the secondary battery, wherein the plurality of positive electrodes are connected to each other outside the outer package without being connected to each other inside the outer package, the outer package includes an electrolytic solution containing an additive, the plurality of positive electrodes contain lithium, and the plurality of positive electrodes are connected to each other outside the outer package after a potential is applied to at least one positive electrode between the plurality of positive electrodes until a potential equal to or less than a potential at which the additive is reductively decomposed is reached. |