Patent ID: 6830841
Filing Date: 2004-12-14
Classification: H01M,Y02E

Abstract:
A fuel cell system comprising:a humidifier humidifying fuel gas and air; a stack producing electric power by reacting the fuel gas humidified by the humidifier and the air humidified by the humidifier, including a plurality of fuel cells and fixed for free movement in a stacked direction thereof, each of the plurality of fuel cells having a polymer electrolyte membrane; a displacement sensor detecting a displacement value in length of the stack in the stacked direction; a temperature sensor detecting a temperature of the stack; and a controller discriminating whether the polymer electrolyte membrane is in a dry state in response to the displacement value of the stack detected by the displacement sensor and the temperature of the stack detected by the temperature sensor, and controlling the humidifier, when the polymer electrolyte membrane is discriminated as in a dry state at a start of operation of the stack, to cause the polymer electrolyte membrane to be brought into a wet state.