阴极堵块高度和过量系数对PEMFC传质的影响  

Effects of cathode block height and excess coefficient on mass transfer of PEMFC

作　　者：蔡永华[1,2,3,4] 吴迪 孙靖茗[1,2,3,4] CAI Yong-hua;WU Di;SUN Jing-ming(Hubei 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 Technology Center of New Energy and Intelligent Connected Vehicle Engineering,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]新能源与智能网联汽车湖北省工程技术中心,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1期8-12,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：建立堵块高度分别为50%、70%、90%和94%的强化传质流道三维模型与传统直流道单流道三维模型,研究阴极堵块高度和过量系数对PEMFC传质的影响,分析两种改善传质性能方法的差异。堵块能够增大流道的传质阻力,迫使反应气体向气体扩散层(GDL)和岸下区域扩散。增设堵块能在各种电流密度下提升氧气浓度。增大过量系数,在电流密度大于1.0 A/cm^(2)时,通过浓度梯度扩散,才能显著提升扩散层氧气浓度。堵块高度为94%时,氧气浓度提升19.2%,电池性能提升4.94%;过量系数增大1.5倍时,氧气浓度提升38.4%,电池性能提升12.75%。The three-dimensional models of enhanced mass transfer channel with 50%,70%,90%and 94%block height and the traditional straight channel single channel were established to study the effects of cathode block height and excess coefficient on mass transfer of PEMFC.The differences between the two methods for improving mass transfer performance were analyzed.The block could increase the mass transfer resistance of the channel,the reaction gas was forced to diffuse to the gas diffusion layer(GDL)and under-rib area.The oxygen concentration could be increased under different current densities by adding blockages.Only when the current density was higher than 1.0 A/cm^(2),by increasing the excess coefficient,the oxygen concentration in GDL could be significantly increased by concentration gradient diffusion.In the case of 94%block height,the oxygen concentration was increased by 19.2%,the battery performance was improved by 4.94%.When the excess coefficient increased by 1.5 times,the oxygen concentration was increased by 38.4%,the battery performance was increased by 12.75%.

关 键 词：质子交换膜燃料电池(PEMFC) 阴极流场 传质性能 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]