Patent ID: 7910251
Filing Date: 2011-03-22
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell stack that includes a plurality of fuel cells, each fuel cell having an anode and a cathode arranged under a state that an electrolyte membrane is positioned therebetween; a fuel tank for storing a fuel; a fuel circulation supply means for circulation-supplying a fuel stored in the fuel tank to the anode of the fuel cell stack; an air supply unit connected to the cathode of the fuel cell stack by an air supply line, for supplying oxygen to the cathode; a sensing unit for measuring a concentration of at least one of fuels supplied to the anode; and a control unit for receiving a signal of the sensing unit and informing replacement time of a fuel, that is stored in the fuel tank, wherein the fuel circulation supply means includes: a gas/liquid separator for separating a fuel, air, and a byproduct remaining at the fuel cell stack after a reaction into gas and liquid, a fuel returning line for returning liquid separated by the gas/liquid separator to the fuel tank, and a recycle pump arranged on the fuel returning line, for pumping liquid separated by the gas/liquid separator.