A fuel cell system comprises a humidifier which can humidify a fuel cell
even when humidification has become insufficient at start-up of the fuel
cell and during normal operation thereof. A water collecting apparatus
which collects water in the exhaust gas of the fuel cell, and an auxiliary
humidifier which humidifies the gas supply by using collected water from
the water collecting apparatus, are provided separate to the
water-permeable-type humidifier. The water collecting apparatus comprises
a vapor/liquid separator and a collected water storage tank, and the
auxiliary humidifier comprises a check valve, a collected water supply
pump, an auxiliary humidification pipe, and an injector. The collected
water in the collected water storage tank is transferred by a collected
water supply pump, atomized by the injector, and supplied to the intake
side of the fuel cell.
