Abstract: At present, proton exchange membrane fuel cell (PEMFC) is one of the hot research topics in the fuel cell field. Previous studies have shown that the water content in the electrolyte membrane plays an important role in the normal operation of PEMFC. Therefore, this paper will build a PEMFC model on the Matlab/Simulink software platform to explore the influence of reaction gas humidification on the performance of fuel cells. Simulation results show that the anode humidification, reaction gas humidity from 20% to 100%, the output voltage of the battery increases, and the current density increases, the voltage can be further improved. Cathode humidification can also improve the output voltage, when the humidity increases from 20% to 60%, the voltage increase is obvious. The increase of humidity in the reaction gas will lead to a decrease in the partial pressure of the reaction gas, especially for the partial pressure of hydrogen, when the relative humidity rises from 60% to 100%, it will significantly decrease. As for oxygen partial pressure, the decline is most pronounced when relative humidity rises from 60% to 80%. According to the results, humidification helps to improve the PEMFC working environment, improve the output characteristics, and facilitate the operation of PEMFC.

Key words: Humidification; PEMFC; Partial pressure of reaction gas; The cathode; The anode; Matlab/Simulink; Output characteristics

摘要： 以往的研究表明，电解质膜中的水含量对质子交换膜燃料电池（PEMFC）的正常工作具有重要的作用。因此，论文在 Matlab/Simulink 软件平台上构建 PEMFC 的模型，探索反应气体加湿对燃料电池工作性能的影响。仿真结果显示，阳极加湿，反应气体湿度从 20%增至100%，电池的输出电压提高，并且电流密度增大，电压可以进一步提升；阴极加湿亦可以提高输出电压，湿度从 20%增至 60%时，电压提高很明显；反应气体中湿度增加，会导致反应气体分压力下降，特别是对氢气分压力，相对湿度从 60%上升至 100%时，其将明显下降；至于氧气分压力，相对湿度从 60%上升至 80%时，下降最明显。根据结果可知，加湿有助于改善 PEMFC 的工作环境，提升输出特性，有利于 PEMFC 的运行。

关键词: 加湿；PEMFC；反应气体分压力；阴极；阳极；Matlab/Simulink；输出特性