Aimed at the problem that the influencing mechanism of configuration size of a differential pressure channel in proton exchange membrane fuel cell(PEMFC)for the cell's electrochemical performance is unclear,the influ-ences of channel height and rib width on the oxygen concentration,water concentration distribution characteristics,cur-rent density,power density,and pressure drop of a differential pressure channel and a straight channel are studied,and a comparative analysis of the two kinds of channels is performed.Results show that channel height has little effect on both channels,but the differential pressure channel has an obvious advantage when its rib width is 1.25 mm or 1.5 mm.The influence of pressure converter area on the performance of the differential pressure channel is further studied,and results show that its peak power density is the highest when the height and length of the pressure converter area are 0.05 mm and 1.5 mm,respectively.With the comprehensive consideration of influences on power density and pressure drop,the differential pressure channel with a height of 0.4 mm,width of 1.25 mm,rib width of 1.25 mm,and a pressure converter area with a length of 1.5 mm and height of 0.05 mm is selected.In this case,its peak power density is 0.366 1 W/cm2,which is 6.3％higher than that of the straight channel.
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