Dynamic response study of air-cooled proton exchange membrane fuel cell stack  

作　　者：Houchang Pei Zhangda Liu Jibing Chen Liangbo Sun Beihai Wang Lu Xing Shanshan Cai Zhengkai Tu 

机构地区：[1]School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan,430048,China [2]Mechanical and Construction Engineering,Northumbria University,Newcastle upon Tyne,NE18ST,UK [3]School of Energy and power Engineering,Huazhong University of Science&Technology,Wuhan,430074,China

出　　处：《Progress in Natural Science:Materials International》2024年第6期1318-1326,共9页自然科学进展·国际材料(英文版)

摘　　要：The dynamic response is a critical performance indicator of air-cooled fuel cells,directly affecting their operation's stability and reliability.This paper experimentally investigated the impact of different operating conditions on the dynamic response characteristics of the air-cooled proton exchange membrane fuel cell(PEMFC)stack.The overvoltage of fuel cells at higher ambient temperatures is smaller after loading,and it takes a shorter time for fuel cells to recover to a stable level.Different air supply modes were investigated,results show that increasing the cathode gas flow rate helps reduce the overshoot voltage of the air-cooled PEMFC stack.A higher cathode flow rate enhances the oxygen concentration at the catalyst layer,helping to supplement the local gas shortage.In addition,as the gas pressure inside the stack is slightly lower than the ambient pressure when the air-cooled PEMFC operates with the exhaust mode,the overshoot voltage of the exhaust air supply mode is 15.8%higher than that of the blow airflow mode under the same air fan speed(4500r/min).Increasing the load change rate leads to insufficient local gas supply without enough time to replenish,causing the cell's overshoot voltage to rise;the more significant the load change rate,the greater the cell's overshoot voltage.Reducing the anode pulse purging interval can reduce the cell output voltage fluctuation with limited effect.

关 键 词：Air-cooled PEMFC Ambient temperature Cathode air flow rate Dynamic response Cleaning interval 

分 类 号：TM911.4[电气工程—电力电子与电力传动]