质子交换膜燃料电池的湿度特性和水的迁移途径

质子交换膜燃料电池的工作性能与湿度密切相关。本文研究了影响质子交换膜燃料电池水平衡的各种因素:电流密度上升,阴极生成的水量也逐渐增多;随着电地温度的提高,维持电池水平衡的电流密度必须提高;为减小欧姆损失,阳极气流需要增湿。本文分析了质子交换膜燃料电池水迁移的原理。为了利用反应生成的水,要采用水管理方法:水管理不足以获得足够含水率时,应采用加湿技术。本文比较了内外加湿法的优劣,借助数学建模的方法模拟了电池内部的工作过程,预测内部湿化系统可以免除气体交叉现象的出现,可以克服电池性能受到影响的弊病。

Humid properties of proton exchange membrane fuel cells and methods for moisture transference

PEMFC's performance is close with its humidity. The paper studied various factors affecting PEMFC's moisture balance. The moisture content will increase while the current density goes up; and the current density for keeping the fuel cell's moisture balance should increase with the humidity rising; The gas from the cathode should be humidified to lessen the loss from its electric resistance. The paper analyzed the fundamentals of its moisture transference. In order to utilize water produced by internal reaction, water should be managed. While water management can only achieve insufficient moisture, the fuel cell should be humidified. The paper compared different modification methods with one another. With the help of mathematical modeling, the paper simulated the PEM fuel cell's interior processes. It is predicted that the interior modification had PEMFC avoid the gases' cross-over and then the fuel cell's performance would not degrade.