Patent ID: 7359808

Claim:
A method for evaluating a fuel cell, sequentially comprising the steps of: (i) setting an inside of said fuel cell to an inert gas atmosphere; and (ii) introducing into said fuel cell at least one of fuel gas and oxidizer gas so that an amount of electricity generated by said fuel cell changes, so as to detect changes of the amount of electricity generated by said fuel cell over time, wherein the gas is introduced in said step (ii) so as to prevent a differential pressure in said fuel cell and in said step (ii), a steady state inside said fuel cell is sequentially measured at respective time points where the gas in said fuel cell is in different concentrations. wherein the gas is introduced in said step (ii) so as to prevent a differential pressure in said fuel cell, and in said step (ii), a steady state inside said fuel cell is sequentially measured at respective time points where the gas in said fuel cell is in different concentrations.