关键词: 质子交换膜燃料电池；水淹问题；水分传输；空气流量；空气湿度

Abstract: Proton exchange membrane fuel cell generates electricity, water and heat through electrochemical reaction of hydrogen and oxygen. When the water content of proton exchange membrane, cathode and anode is appropriate and evenly distributed, the fuel cell has high power generation performance. However, if water accumulates at the cathode and cannot be discharged in time, it will cause "water flooding". It will lead to the performance degradation and even shutdown of the stack. This paper deduces the law of water content in the cathode according to the water transmission mechanism inside the fuel cell, and finds out the factors that affect the water content in the stack, so as to obtain the optimization scheme to solve the "water flooding" problem. The feasibility and effectiveness of the optimization scheme are verified through the test and actual measurement, and finally the "water flooding" problem of the fuel cell cathode is solved.

Key words: Proton exchange membrane fuel cells; Flooding problem; Water transport; Air flow; Air humidity