Fuel cell system and driving method thereof

摘要

A fuel cell system comprising: a fuel cell stack provided with a fuel inlet, a fuel outlet, an oxidant inlet and an oxidant outlet; a fuel supply unit adapted to supply fuel to the fuel cell stack; an oxidant supply unit adapted to supply oxidant to the fuel cell stack; a fuel inflow pipe for supplying fuel from the fuel supply unit to the fuel inlet during a first operating condition; a fuel outflow pipe for discharging non-reacted fuel from the fuel outlet during the first operating condition; a first bypass pipe for supplying fuel from the fuel supply unit to the fuel outlet during a second operating condition; and a second bypass pipe for discharging non-reacted fuel from the fuel inlet during the second operating condition.