NOVELTY - A purging device comprises a fuel cell stack (10) including an anode (12) and a cathode (14); a first valve (31) provided in a hydrogen supply line (20); a second valve (32) provided in a hydrogen discharge line (22) connected to an outlet of the anode; a branch line (26) connected between a line, which connects the first valve in the hydrogen supply line and the anode, and an air supply line (24) for supplying air to the cathode; a third valve (33) provided in the branch line; and a controller (40) for controlling the opening and closing of the valves.    USE - A purging device used for improving cold start performance of a fuel cell of a vehicle (claimed), e.g. passenger automobiles including sports utility vehicles, buses, trucks, commercial vehicles, watercraft including a variety of boats and ships, aircraft; and hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and alternative fuel vehicles.    ADVANTAGE - The device maximizes the cold start performance of the fuel cell by supplying a gas mixture of hydrogen and air to the cathode of the fuel cell stack to increase the effect of water removal after shutdown of the fuel cell system so that electricity, water, and heat are produced by an electrochemical reaction of the mixed gas at the cathode, thus increasing the temperature of the fuel cell stack and purging the gas mixture from the fuel cell stack, unlike an electrochemical reaction which occurs during normal operation.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a non-transitory computer readable medium containing executable program instructions executed by a processor to control a purging process in a fuel cell stack of a vehicle.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the purging device.    Fuel cell stack (10)    Anode (12)    Cathode (14)    Hydrogen supply line (20)    Hydrogen discharge line (22)    Air supply line (24)    Branch line (26)    First valve (31)    Second valve (32)    Third valve (33)    Controller (40)