NOVELTY - The device has an air-compressor (202) for supplying air to a cathode of a fuel cell (200), and an injector i.e. binary spray nozzle (100), arranged in an air supply line that is connected to an inlet of the-air compressor to inject condensed water discharged from the fuel cell to the inlet of the air compressor using the bypassed compressed air from an outlet of the air compressor. A bypass line (110) connects the outlet of the air compressor to an inlet of the injector, and includes a bypass valve (112) designed to adjust an opening and closing angle.    USE - Gas-gas membrane humidification air-humidification device for a fuel cell i.e. polymer electrolyte membrane fuel cell, which is utilized to convert chemical energy into electric energy of a vehicle (claimed). Uses include but are not limited to a motor vehicle e.g. passenger vehicle such as sports utility vehicles (SUV), various commercial vehicles such as buses and lorries, watercraft such as boats and ships, aircraft, hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and non-petroleum fuel vehicles.    ADVANTAGE - The injector is arranged in the air supply line that is connected to the inlet of the-air compressor to inject the condensed water discharged from the fuel cell to the inlet of the air compressor using the bypassed compressed air from the outlet of the air compressor such that air supplied to the fuel cell can be easily humidified by mixing the water with air while injecting the mixture into the inlet of the air-compressor, thus performing sufficient humidification in a high load area.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an air-humidification method for a fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of an air-humidification device for a fuel cell. '(Drawing includes non-English language text)'    Binary spray nozzle (100)    Bypass line (110)    Bypass valve (112)    Fuel cell (200)    Air-compressor (202)