Abstract: One or more operating parameters, such as electrical current flow from and air flow to, a fuel cell stack within a fuel cell assembly is periodically modulated during rehydration intervals to intermittently increase hydration levels of the fuel cell stack independently of the electrical current demand on the fuel cell assembly from an external load, while maintaining electrical current delivery to that external load.

Abstract: A detachable and portable fuel cell power unit which may be used with a vehicle. Said power unit with a unitary housing containing: a fuel reservoir for storing fuel; at least one electrochemical fuel cell stack for delivering electrical power; a fueling port in an outer surface of the housing; and an airflow path extending between a first inlet port on an outer surface of the housing and a first outlet port on an outer surface of the housing, via cathode elements in the at least one fuel cell stack. Said unit includes a control circuit for interfacing with a power controller on the vehicle for determining allowable operating conditions.

Abstract: One or more operating parameters, such as electrical current flow from and air flow to, a fuel cell stack within a fuel cell assembly is periodically modulated during rehydration intervals to intermittently increase hydration levels of the fuel cell stack independently of the electrical current demand on the fuel cell assembly from an external load, while maintaining electrical current delivery to that external load.

Abstract: A detachable and portable fuel cell power unit (10) fox a vehicle has a unitary housing (11) containing: a fuel reservoir (22) for storing fuel; at least one electrochemical fuel cell stack (20, 21) for delivering electrical power from the fluid fuel; a refueling port (16) in an outer surface of the housing; and an airflow path extending between a first inlet port (12, 14) on an outer surface of the housing (11) and a first outlet port (15) on an outer surface of the housing (11), via cathode elements in the at least one fuel cell stack (20, 21). The unit includes a control circuit (23) for interfacing with a power controller on the vehicle for determining allowable operating conditions of the vehicle while the power unit (10) is coupled thereto.

Abstract: The present invention relates to flow field plates and the manufacture thereof, for use in fuel cells. The method of manufacture comprises particulate etching of a plate material using a particulate etchant (eg. sand blasting), a particulate etchant accelerator and a particulate etchant-resistant patterned mask, such that a fluid flow pattern determined by the pattern design on said mask is formed on the plate material.