Patent ID: 8663832

Claim:
A cell comprising: a power-generating element including a plurality of unit cell layers, and an outer package configured for packaging the power generating element, each unit cell layer comprising: a first electrode having a first collector; a second electrode having a second collector; and an electrolyte layer disposed between the first electrode and the second electrode, wherein the first collector has a first thickness and a first melting temperature and the second collector has a second thickness and a second melting temperature, the first thickness being greater than the second thickness and the first melting temperature being less than the second melting temperature is configured to form a short circuit between the first collector and the second collector with a conductor when a conductor from outside the cell penetrates the first collector and the second collector of at least one of the plurality of unit cell layers with the conductor having a shorted portion of the first collector fuses from heat generated by the short circuit before a temperature of the unit cell layers reaches a predetermined value so that the short circuit is blocked.