Contract to the traditional water-cooled proton exchange membrane fuel cell(PEMFC),air-cooled PEMFC has the characteristics of simple cooled and hydrogen inlet system,easily carried or moved.Based on 2 kW air-cooled PEMFC stack,the relationship between the practical and theoretical air flow rate under different duty cycle,temperature distribution on duel cell stack,the influence of hydrogen intake pattern on the performance of the average single cell output voltage,voltage consistency uniformity,power of stack were considered.The experimental results indicate that the practical air flow rate is only 80% of the max theoretical air flow rate;the temperature distribution on duel cell stack is uneven,the temperature close to bipolar plate or the middle of the fuel cell stack is higher than the side.Besides,the stack has 68 cell plates and the max electric power reaches 1.92 kW.Compare single-in single-out with double-in double-out hydrogen flow pattern,the electric power is pretty much the same,the former is better than the latter on the voltage consistency uniformity.
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