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Hydrogen Cars How do hydrogen engines function? Hydrogen fuel cell vehicles are categorized as e-cars since they are propelled by an electric motor. In contrast to a BEV, or "Battery Electric Vehicle," the typical abbreviation is FCEV, or "Fuel Cell Electric Vehicle." The fact that hydrogen fuel cell automobiles generate their own electricity is a key distinction between them and other electric vehicles. This means that, unlike fully electric or plug-in hybrid vehicles, the car doesn't have an internal battery that can be charged by an outside power source. Instead, the fuel cell inside hydrogen automobiles functions as a vehicle's own reliable power source. Reverse electrolysis, a technique used in fuel cell technology, is the process by which hydrogen reacts with oxygen inside the fuel cell. While the oxygen is drawn from the surrounding air, the hydrogen is stored in one or more tanks that are part of the FCEV. The only products of this reaction are h...