High-powered proton exchange membrane fuel cell(PEMFCs) can be used on electrical vehicles.The detachment-integration stack with active area of 390cm2 was developed. Based on it

research was concentrated on the subsystem of a Nafion115 membrane humidifier

and performance for membrane humidification. In this paper

the principle of membrane humidification is analyzed

and the effects of humidifying temperature

reaction gas pressure

reaction gas flow rate and power of hot water pump on humidification function are studied systematically. The results show that humidifying rate is fast between 50℃ and 70℃

and increases nonlinearly with gas flow.When the active area of membrane is enlarged

the humidifying rate will decrease

but the relative humidity of gas will increase.Humidification becomes more difficult at a higher gas pressure. Finally

the suitable operation conditions are determined.The maximum of the stack is more than 1.2W8226;cm-2 at the current density 2.1A8226;cm-2.