质子交换膜燃料电池一体化密封设计与仿真

Design and Simulation of Integrated Seal for Proton Exchange Membrane Fuel Cell

以提升质子交换膜燃料电池(PEMFC)结构可靠性、降低各部件损伤风险为目标,将阳极板、阴极板和膜电极通过注塑粘合成一个整体部件,开发了一种一体化密封单电池,该方案对膜电极具有更好的保护性,且更易加工成型。对模型进行有限元仿真,结果表明,在阴极板流场脊区域平均应力0.6~1.2 MPa条件下,一体化密封方式下质子交换膜(PEM)活性区域边缘平面内平均变形量比线密封方式降低了67.52%~80.73%,活性区域厚度方向上受压后平均变形量降低了30.86%~45.92%,极大改善了PEM的力学稳健性,降低其撕裂风险,从而提升了其使用寿命。搭建了基于差压法的密封性能测试系统,对加工成型的一体化密封单电池实物进行了密封性能测试,结果表明各项漏率指标均达标。

An integrated sealed unit cell is designed with the goal of improving the structural reliability of the Proton Exchange Membrane Fuel Cell(PEMFC)and reducing the risk of damage to the components.The anode plate,cathode plate and membrane electrode are bonded into an integral part by injection molding,which provides better protection for the Membrane Electrode Assembly(MEA)and is easier to process and mold.The finite element simulation of the model shows that under the condition that the average stress in the ridge region of the cathode plate flow channel is 0.6~1.2 MPa,the average deformation in the edge plane of the PEM active area under the unit cell is 67.52%~80.73%lower than that of the linear sealed single cell;similarly,the average deformation in the thickness direction of the PEM active area under the unit cell is 30.86%~45.92%lower than that of the linear sealed single cell.This will greatly improve the mechanical robustness of PEM,reduce the risk of tearing,and increase its service life.A sealing performance test system based on the differential pressure method is built to conduct the leak test on the integrated sealed unit cell.The result shows that all the leakage rates reach the qualified standard.