质子交换膜燃料电池双极板与气体扩散层接触压力测量与模拟

Measurement and simulation of contact pressure between bipolar plate and gas diffusion layer in PEM fuel cell

质子交换膜(PEM)燃料电池的组装力和工作温度对双极板与气体扩散层(GDL)之间的接触压力有着重要影响,而双极板与气体扩散层之间接触压力的大小与分布对燃料电池的电化学性能至关重要。基于有限元软件ABAQUS开发了PEM燃料电池预紧力-温度顺序耦合程序,预测得到了不同螺栓预紧力和温度下双极板与气体扩散层间接触压力的大小和分布。有限元分析结果表明:接触压力随预紧力的增大而增大;燃料电池的工作温度对双极板与气体扩散层之间的接触压力有重要影响,接触压力随温度的升高而增大。采用压力传感膜技术试验测试了双极板与GDL之间的接触压力大小与分布,试验结果与模拟结果吻合较好。

Assembly force and operating temperature of proton exchange membrane（ PEM） fuel cell had a significant effect on contact pressure between bipolar plate and gas diffusion layer（ GDL）,and the contact pressure and its distribution were critical to electric-chemical performance of the PEM fuel cell. Based on the ABAQUS software,a coupled force-temperature procedure was developed. The finite element method（ FEM） was used to predict the contact pressure between the bipolar plate and the GDL under various clamping forces and temperatures. The FEM results showed that the contact pressure increased with the increase of the clamping force,and the operating temperature of the PEM fuel cell affected the contact pressure between the bipolar plate and the GDL. It was found that the contact pressure increased with the increase of the operating temperature. In addition,a pressure film was used to measure the contact pressure between the bipolar plate and the GDL. Experimental results were in good agreement with the FEM results.