PEM燃料电池双极板与气体扩散层界面接触电阻测量与模拟  

Measurement and Simulation of Contact Resistance Between Bipolar Plate and Gas Diffusion Layer in PEM Fuel Cell

作　　者：李果[1] 谈金祝[1] 巩建鸣[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009

出　　处：《机械工程学报》2011年第8期158-162,共5页Journal of Mechanical Engineering

基　　金：教育部高等学校博士学科点专项科研基金(200802910004);江苏省自然科学基金(BK2009362);江苏省高校自然科学研究计划(08KJB430005);南京工业大学博士论文创新基金(BSCX200904)资助项目

摘　　要：质子交换膜(Proton exchange membrane,PEM)燃料电池中双极板(Bipolar plate,BPP)与气体扩散层(Gas diffusion layer,GDL)界面接触电阻对燃料电池电化学性能有着重要影响,而螺栓夹紧力又是影响接触电阻的关键因素之一。因此,针对PEM燃料电池中的双极板与气体扩散层,采用试验和有限元模拟相结合的方法研究螺栓夹紧力对接触电阻的影响。结果表明,随着螺栓夹紧力的增加,双极板与气体扩散层界面接触电阻呈下降趋势,起初下降较快,然后下降逐步平缓。基于有限元软件ABAQUS开发一个力—电耦合程序预测得到了双极板与气体扩散层界面接触电阻,其结果与试验结果吻合较好。同时采用有限元法分析螺栓夹紧力对气体扩散层孔隙率变化的影响。结果表明,随着螺栓夹紧力的增加,气体扩散层孔隙率降低,特别是双极板与气体扩散层接触圆角区域,下降最为明显。The contact resistance between bipolar plate（BPP） and gas diffusion layer（GDL） has a significant effect on the electric-chemical performance of the proton exchange membrane（PEM） fuel cell.The applied force on each of bolts in PEM fuel cell assembly is critical to the contact resistance between BPP and GDL for the PEM fuel cell.So the contact resistance between the BPP and the GDL is studied by using both experimental and finite element methods.The test results show that the contact resistance decreases with the increase of the clamping force quickly at first,and then gently.Based on the code ABAQUS,a coupled mechanical-electric procedure is developed.And then,the finite element method（FEM） is used to predict the contact resistance between the BPP and GDL under various clamping forces.The FEM results are in good agreement with the experimental results.In addition,the effect of the clamping force on the porosity of the GDL is analyzed by using FEM.The results indicate that the porosity decreases with the increase of the clamping force,especially at the round corner area of the BPP contacted with GDL.

关 键 词：接触电阻 双极板 气体扩散层 夹紧力 孔隙率 质子交换膜燃料电池 

分 类 号：TK91[动力工程及工程热物理]