The procedure of the invention successively obtains an estimated value of amount of liquid water in a fuel cell during operation in each specified period by the following steps (a) to (d), thereby improving the detection accuracy of the water condition ins...

In a fuel cell system which executes a stop process of stopping an output from a fuel cell when a required power generation amount for the fuel cell is smaller than a predetermined power generation amount and supplies oxidant during a stop process period, ...

There are provided a fuel cell system capable of reducing thermal stress which acts on a fuel cell at the time of shutdown, and an operating method thereof. A fuel cell system includes a fuel cell (1) that generates electric power using fuel gas and oxygen...

Since a conventional fuel cell system has a structure in which a filter in an exhaust flow passage for fuel exhaust gas is heated by a heater, the exhaust flow passage can be prevented from being blocked due to freeze, but there has been the problem of ext...

For implementing a stop control which extracts a current from a fuel cell and consumes a cathode side oxygen at a system stop, the current extraction from the fuel cell is ended in a state that a certain quantity of oxygen smaller than when the current ext...

Disclosed is a fuel cell system provided with a fuel cell (1), a water tank (2) which stores water to be supplied to the fuel cell, and a heating device (10) which defrosts the water inside the tank during activation of the fuel cell. The fuel cell system ...