蛇形流场PEM燃料电池膜中水传输的三维模拟

Three-dimensional modeling for Water Transport in Membrane of PEM Fuel Eell With Serpentine Flow Field

膜中水传输对质子交换膜燃料电池的性能具有极其重要的影响.文中建立了一个蛇形流场单电池的三维模型,研究了低电流密度下燃料电池运行温度、膜厚、过量系数、相对湿度、操作压力和电流密度等运行条件对膜中水含量的影响.计算结果表明:随着温度的升高,膜中的水含量先升高后降低;减小质子交换膜膜厚和过量系数,增大相对湿度、操作压力和电流密度,膜中的水含量增加,电导率就会增加,从而促进电池性能提高.

Water transport in membrane plays an important role in PEM fuel cell performance. Therefore research on water transport in membrane is extremely essential. This article established a 3D single fuel cell model with serpentine flow field. The influences of the operating temperature, membrane thickness, air stoichiometry, relative humidity, operating pressure and current density on the water content in membrane under low current density are studied, and then the influence of the above parameters on the performance of fuel cell is obtained. The results show that： As the temperature rises, the water content will increased and then lower. Reduceing the proton exchange membrane thickness and air stoichiometry, increasing the relative humidity, pressure and current density operation, the water content in the membrane will increase, the conductivity will increase and thus will improve the performance of the fuel cell.