PEMFC新型压差流道传质与电化学性能研究  

Study on Mass Transfer and Electrochemical Performance of PEMFC with Novel Differential Pressure Flow Channel

作　　者：赵富强[1] 祁慧青 范晓宇 贾彦奎 张晓东[2] ZHAO Fuqiang;QI Huiqing;FAN Xiaoyu;JIA Yankui;ZHANG Xiaodong(Heavy Machinery Engineering Research Center of Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Mechanical Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学重型机械教育部工程研究中心,太原030024 [2]太原理工大学机械工程学院,太原030024

出　　处：《电源学报》2023年第4期148-158,共11页Journal of Power Supply

基　　金：山西省科技计划揭榜招标资助项目(20201101020)。

摘　　要：双极板是质子交换膜燃料电池PEMFC(proton exchange membrane fuel cell)核心组件,极板的流道形状和尺寸直接影响反应气体的利用率以及电池的排水、散热性能。基于极板工作原理提出一种新型PEMFC压差流道构型,研究流道内阴极氧气浓度、水浓度分布、进出口压降、流速的变化,分析电流密度和极化曲线对燃料电池电化学性能的影响;在50%开孔率时,通过对比8组低压直流道和高压直流道的宽度同时增大的仿真结果发现,低压直流道和高压直流道宽度均由2.25 mm减小到0.5 mm时,功率密度峰值提高了31.9%。进一步探究压差流道中增大或保持一种流道宽度不变而改变另一种流道宽度对燃料电池电化学性能的影响,结果表明低压直流道和高压直流道宽度均为1 mm时,功率密度峰值最高可达0.39 W/cm~2。Bipolar plate is the core component of proton exchange membrane fuel cell(PEMFC),and the shape and size of flow channels on the plate directly affect the utilization rate of reaction gas and the drainage and heat dissipation performance of the battery.Based on the working principle for the plate,a novel configuration of differential pressure channel for PEMFC is proposed.The changes in concentration distributions of oxygen and water in the cathode,inlet and outlet pressure differences and flow rate are studied,and the effects of current density and polarization curve on the electrochemical performance of fuel cells are analyzed.With the opening rate of 50%,compared with the simulation results when the widths of 8 groups of low-pressure and high-pressure straight channels increase at the same time,it is found that the peak power density increases by 31.9% when the widths of low-pressure and high-pressure straight channels both decrease from 2.25 to 0.5 mm.The influence of increasing or maintaining one flow channel width while changing the other on the electrochemical performance of the fuel cell is further explored,and results show that when the widths of both the low-pressure and high-pressure straight channels are 1 mm,the peak power density can reach up to0.39 W/cm~2.

关 键 词：质子交换膜燃料电池(PEMFC) 压差流道 流道宽度 功率密度 

分 类 号：TM911.41[电气工程—电力电子与电力传动]