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A method for warming up a fuel cell system comprising; a fuel cell which generates electric current due to an electrochemical reaction between hydrogen and oxygen, and which supplies the electric current to a load, an air supply pipe for supplying air to the fuel cell as an oxidant gas, an air exhau

A method for warming up a fuel cell system comprising; a fuel cell which generates electric current due to an electrochemical reaction between hydrogen and oxygen, and which supplies the electric current to a load, an air supply pipe for supplying air to the fuel cell as an oxidant gas, an air exhaust pipe for discharging exhaust air from the fuel cell to an atmosphere, a compressor provided on either of air supply pipe and air exhaust pipe, which carries the air and a communication pipe which returns exhaust air to air supply pipe, and which communicates exhaust air pipe with air supply pipe to form a circulation cycle including compressor. The method of the present invention comprises: detecting a temperature of the fuel cell, and if the temperature of the fuel cell is lower than a first prescribed temperature, heating fuel cell by circulating the air, which has been heated by a heat generated due to adiabatic compression through compressor prior to supplying the electric current to the load from the fuel cell.

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What is claimed is: 1. A method for warming up a fuel cell system comprising; a fuel cell which generates electric power due to an electrochemical reaction between hydrogen and oxygen, an air supply pipe for supplying air to the fuel cell as an oxidant gas, an air exhaust pipe for discharging exhau

What is claimed is: 1. A method for warming up a fuel cell system comprising; a fuel cell which generates electric power due to an electrochemical reaction between hydrogen and oxygen, an air supply pipe for supplying air to the fuel cell as an oxidant gas, an air exhaust pipe for discharging exhaust air from the fuel cell to an atmosphere, a compressor provided on either of said air supply pipe and said air exhaust pipe, which carries the air and a communication pipe which returns said exhaust air to said air supply pipe, and which communicates said exhaust air pipe with said air supply pipe to form a circulation cycle including said compressor; said method comprising: detecting a temperature of the fuel cell, determining whether or not the detected temperature of the fuel cell is lower than a first prescribed temperature, and heating said fuel cell by circulating the air, which has been heated by a heat generated due to adiabatic compression through said compressor prior to the generation of the electric power, if the detected temperature of the fuel cell is lower than the first prescribed temperature. 2. The method as claimed in claim 1, further comprising: heating said fuel cell until the temperature of the fuel cell exceed a second prescribed temperature at which the fuel cell can efficiently generate the electric power by the electrochemical reaction, wherein the second prescribed temperature is higher than the first prescribed temperature. 3. The method as claimed in claim 2, wherein said fuel cell generates the electric power after the temperature of the fuel cell reaches the second prescribed temperature. 4. An apparatus for warming up fuel cell system comprising: a fuel cell which generates an electric power due to an electrochemical reaction between hydrogen and oxygen, an air supply pipe for supplying air to the fuel cell as an oxidant gas, an air exhaust pipe for discharging exhaust air from the fuel cell to an atmosphere, a compressor provided on either of said air supply pipe and said air exhaust pipe, which carries the air and a communication pipe which returns said exhaust air to said air supply pipe, and which communicates said exhaust air pipe with said air supply pipe to form a circulation cycle including said compressor; a thermo-sensor, which detects a temperature of the fuel cell, and control means for controlling said compressor to heat said fuel cell by circulating the air, which has been heated by a heat generated due to adiabatic compression through said compressor prior to the generation of the electric power, if the temperature of the fuel cell detected by the thermo sensor is lower than a first prescribed temperature. 5. The apparatus as claimed in claim 4, wherein said control means controls said compressor to heat the fuel cell until the temperature of the fuel cell exceed a second prescribed temperature at which the fuel cell can efficiently generate the electric power by the electrochemical reaction, wherein the second prescribed temperature is higher than the first prescribed temperature. 6. The apparatus as claimed in claim 5, wherein said control means controls the fuel cell to generate the electric power after the temperature of the fuel cell reaches the second prescribed temperature.