Patent ID: 8956774
Filing Date: 2015-02-17
Classification: H01M,Y02E

Abstract:
1. A method for shutting down a fuel cell system, the method comprising: determining, by a controller, whether an outside air temperature is below a first predetermined reference temperature when a shutdown of a fuel cell system is detected; warming up a fuel cell stack by operating a balance of plant components of the fuel cell system and a stack-coupled resistor using power from the fuel cell stack, when the outside air temperature is below the first reference temperature, wherein a valve between a blower and the fuel cell stack is controlled to bypass air received at the valve through the stack-coupled resistor before being received by the fuel cell stack; removing water in the fuel cell stack by passing air supplied by an air supply system just through the stack-coupled resistor to supply heated air to a cathode of the fuel cell stack; and shutting down, by the controller, the fuel cell system by cutting off the supply of air after the removal of water, wherein: when the controller determines that the outside air temperature is below the first reference temperature, the warm-up of the fuel cell stack and the removal of the water from the fuel cell stack are performed in a fuel cell only mode in which the balance of plant components and the stack-coupled resistor is operated only by the power from the fuel cell stack, and then when the controller determines that the temperature of the fuel cell stack exceeds a second predetermined reference temperature while the heated air is being supplied to the cathode,