Patent ID: 6872484

Claim:
A humidifying system for a fuel cell comprising: a fuel cell including an anode and a cathode, in which a fuel gas supplied to the anode and an oxidant gas supplied to the cathode chemically react with each other to generate electricity; a first humidifier that transfers moisture contained in a cathode exhaust gas discharged from the cathode, to the fuel gas through a hollow fiber membrane; a second humidifier that transfers moisture contained in a cathode exhaust gas discharged from the first humidifier, to the oxidant gas through a hollow fiber membrane; a cathode exhaust gas passage through which the cathode exhaust gas flows from the cathode of the fuel cell via the first humidifier to the second humidifier; and a bypass that is provided to the cathode exhaust gas passage to allow part of the cathode exhaust gas to detour round the first humidifier and flow to the second humidifier.