Abstract: High-powered proton exchange membrane fuel cell(PEMFCs) can be used on electrical vehicles.The detachment-integration stack with active area of 390cm² was developed. Based on it, research was concentrated on the subsystem of a Nafion115 membrane humidifier, and performance for membrane humidification. In this paper, the principle of membrane humidification is analyzed, and the effects of humidifying temperature, reaction gas pressure, reaction gas flow rate and power of hot water pump on humidification function are studied systematically. The results show that humidifying rate is fast between 50℃ and 70℃, and increases nonlinearly with gas flow.When the active area of membrane is enlarged, the humidifying rate will decrease, but the relative humidity of gas will increase.Humidification becomes more difficult at a higher gas pressure. Finally, the suitable operation conditions are determined.The maximum of the stack is more than 1.2W•cm^-2 at the current density 2.1A•cm^-2.

Key words:

质子交换膜, 燃料电池, 水管理, 加湿器

摘要： 在已开发的分体式质子交换膜燃料电池电堆基础上，对膜（Nafion115）加湿器子系统进行了详细的研究，揭示了质子交换膜燃料电池膜加湿方法的特性.初步分析了膜加湿的原理，并在不同操作条件下，定量地对膜透过水量与反应气体的润湿程度进行了测量，得到了Nafion115膜加湿器对电堆的润湿性能.发现操作温度在50～70℃之间，加湿速率最强；随着反应气体流量的增大，加湿速率呈非线性增加，但润湿程度反而降低；增加质子交换膜面积会增大反应气体的相对湿度，而加湿速率将下降；较高反应气体压力下不利于加湿.在适当的膜加湿器工况下，当电流密度为2.1A•cm^-2时，电堆最大功率密度可超过1.2W•cm^-2.

关键词:

质子交换膜, 燃料电池, 水管理, 加湿器