Patent ID: 7462414
Filing Date: 2008-12-09
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell for generating electrical power by performing electrochemical reaction of combining oxidizing agent gas and fuel gas; an oxidizing agent gas exhaust passage through which non-reacted residual oxidizing agent gas in the oxidizing agent gas supplied to the fuel cell passes to the outside of the fuel cell system; a refrigerant circulation passage through which refrigerant is circulated; a refrigerant compressor for compressing the refrigerant and sending the compressed refrigerant to the refrigerant circulation passage; a refrigerant-outdoor air heat exchanger for performing heat exchange between an outdoor air and the refrigerant discharged from the refrigerant compressor; an oxidizing agent gas-refrigerant heat exchanger for performing heat exchange between the oxidizing agent gas passing through the oxidizing agent gas exhaust passage and the refrigerant passing through the refrigerant circulation passage; a primary pressure reducing valve for reducing a pressure of the refrigerant, which is disposed between the refrigerant compressor and the oxidizing agent gas-refrigerant heat exchanger; and a secondary pressure reducing valve for reducing a pressure of the refrigerant, which is disposed between the oxidizing agent gas-refrigerant heat exchanger and the refrigerant-outdoor air heat exchanger, wherein during the heat transfer between the oxidizing agent gas and the refrigerant by the oxidizing agent gas-refrigerant heat exchanger, the primary pressure reducing valve reduces the pressure of the refrigerant so that a temperature of the refrigerant becomes not less than a specified temperature at which water component contained in the oxidizing agent gas does not freeze.