PEMFC阴极的强化传质机制  

Enhanced mass transfer mechanism of the cathode of PEMFC

作　　者：蔡永华[1,2,3,4] 魏帆 吴迪 孙靖茗[1,2,3,4] CAI Yong-hua;WEI Fan;WU Di;SUN Jing-ming(Hubei Provincial Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan,Hubei 430070,China;Hubei Engineering Technology Research Center of New Energy and Intelligent Connected Vehicle,Wuhan,Hubei 430070,China;School of Automotive Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [2]汽车零部件技术湖北省协同创新中心,湖北武汉430070 [3]新能源与智能网联车湖北省工程技术研究中心,湖北武汉430070 [4]武汉理工大学汽车工程学院,湖北武汉430070

出　　处：《电池》2021年第5期435-439,共5页Battery Bimonthly

基　　金：国家自然科学基金面上项目(51576147);新能源汽车科学与关键技术学科创新引智基地资助(B17034)。

摘　　要：建立强化传质流道三维模型及直流道单流道三维模型,研究堵块高度和阴极过量系数共同作用下质子交换膜燃料电池(PEMFC)的传质性能,提出可预测电池性能影响因素的无量纲数K。K<30时,影响电池性能的因素主要是缺乏反应气体;K>40时,影响电池性能的因素是:流道结构对反应气体的容纳量有限,过大的压降所造成的泵送功率的提升幅度大于电池功率。增设堵块的结构能够使PEMFC在大过量系数下发挥更好的传质强化效果,以94%高度堵块为例,相较于直流道,氧气摩尔浓度在高、低电流密度下的提升幅度分别为38%和20%。Three dimensional models of enhanced mass transfer channels and single channel straight channel were established to study the mass transfer performance of proton exchange membrane fuel cell(PEMFC)under the combined action of block height and cathode excess coefficient.A dimensionless number K which could predict the effect factor on cell performance was proposed.When K<30,the main factor effecting the cell performance was the lack of reactive gas.When K>40,the factors effecting the cell performance were:the capacity of flow channel structure for the reaction gas was limited,the increase of pumping power caused by excessive pressure drop was greater than that of cell power.Adding block structures could obtain better mass transfer enhancement effect of PEMFC under large excess coefficient.94%height block was taken as an example,compared with the straight channel,the oxygen molar concentration improving was 38%and 20%at high and low current density,respectively.

关 键 词：质子交换膜燃料电池(PEMFC) 流场 传质 堵块高度 过量系数 

分 类 号：TM911.42[电气工程—电力电子与电力传动]