NOVELTY - The fuel cell system having a device (11) for drying gases, comprises a cooling body having a first surface (14), a removal device, and a drive equipment coupled with the removal device. The cooling body is designed to be thermally connected to a heat sink (12) and make contact with gas flowing past. The removal device is displaceably mounted relative to the first surface and is set up for removing frozen water from the first surface. The removal device comprises an edge for scraping of ice of the first surface. The drive equipment is coupled with the removal device.    USE - Fuel cell system having a device useful for drying gases useful for aircraft (claimed).    ADVANTAGE - The fuel cell system can be economically manufactured with low construction and maintenance cost.    DETAILED DESCRIPTION - The fuel cell system having a device (11) for drying gases (4), comprises a cooling body having a first surface (14), a removal device, and a drive equipment coupled with the removal device. The cooling body is designed to be thermally connected to a heat sink (12) and make contact with gas flowing past. The removal device is displaceably mounted relative to the first surface and is set up for removing frozen water from the first surface. The removal device comprises an edge for scraping of ice of the first surface. The drive equipment is coupled with the removal device. The heat sink is a hollow body, where the first surface has an inner surface of the hollow body. The heat sink is implemented section-wisely as hollow cylinder, where the first surface is the inner cover surface of the heat sink. The removal device has a spindle shape, stands in contact on its outer spindle edges with the inner surface of the heat sink and is rotatably arranged on a fixed axis (18) to the heat sink. A hollow body surrounding the heat sink is formed under formation of a gap for flowing a fluid. The heat sink comprises a widening area at the end. Hydrogen from a cryogenic hydrogen tank is used as a heat sink. An INDEPENDENT CLAIM is included for a method for drying exhaust gas of a fuel cell system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of a device for drying gases.    Gas to be dried (4)    Device (11)    Heat sink (12)    First surface (14)    Axis. (18)