학술논문
PEMFC压差流道构型特征参数对电池性能的影响 / Influences of Configuration Characteristic Parameters of PEMFC Differential Pressure Channel on Cell Performance
Document Type
Academic Journal
Author
Source
电源学报 / Journal of power supply. 22(1):110-118
Subject
Language
Chinese
Abstract
针对质子交换膜燃料电池PEMFC(proton exchange membrane fuel cell)压差流道构型尺寸对电池电化学性能影响机理不明的问题,研究流道高度和脊背宽度对压差流道和直流道在氧气浓度、水浓度分布特征和电流密度、功率密度、压降等方面影响规律,并对两者进行了对比分析,结果表明流道高度对压差流道和直流道性能影响较小,压差流道在脊背宽度为1.25 mm和1.50 mm时具有明显优势;进一步研究压差流道变压区对流道性能的影响,结果表明变压区高度为0.05 mm和长度为1.50 mm时,压差流道峰值功率密度最高.综合考虑功率密度和压降的影响,选择压差流道高0.40 mm、宽1.25 mm、脊背宽1.25 mm、变压区长1.50 mm、高0.05 mm,此时压差流道峰值功率密度为0.366 1 W/cm2,相较于直流道峰值功率密度提升6.3％.
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.
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.