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Effect of Compressive Pressure on the Contact Behavior Between Bipolar Plate and Carbon Paper in a Proton Exchange Membrane Fuel Cell
LI Guo 1 #,TAN Jinzhu 2,GONG Jianming 2 *
1.School of Mechanical and Power Engineerng , Nanjing university of technology, NanJing 211816
2.School of Mechanical and Power Engineerng , Nanjing university of technology
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China （No.200802910004）, innovation Program for Graduate 270 Students in Nanjing University of Technology （No.No.BSCX200904）, Research and Innovation Project for College Graduates of Jiangsu Province in China（No.CXZZ11_0335）, the Natural Science Foundation of China（No.51175241）
Opened online:31 March 2012
Accepted by: none
Citation: LI Guo,TAN Jinzhu,GONG Jianming.Effect of Compressive Pressure on the Contact Behavior Between Bipolar Plate and Carbon Paper in a Proton Exchange Membrane Fuel Cell[OL]. [31 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4470612
 
 
The compressive pressure during the assembly of proton exchange membrane (PEM) fuel cells has a great influence in the contact resistance between bipolar plate (BPP) and gas diffusion layer (GDL). In this paper, three different types of carbon papers are used as GDL materials. The contact resistance between BPP and GDL is measured under different applying clamping torques. Based on experimental data, a relationship of compressive pressure resulting from the applying claming torque and contact resistivity is established by the least square method. Based on the commercial code ABAQUS, a program is developed to predict the contact resistivity. In addition, the changes of contact pressure, contact area and porosity of GDL are studied. The experimental result shows that the contact resistivity nonlinearly decreases with increasing of the applying clamping torque. The thicker GDL without fillers has a higher contact resistivity. Finite element analysis (FEA) results show that both contact area and contact pressure increase with increasing of the compressive pressure in the same fillet radius of the rib except that the fillet radius is zero. The contact resistivity decreases with increase of the clamping force, which is consistent with the experimental results. The porosity decreases with increase of the clamping force. So the clamping force should be chosen carefully considering both the effect of contact resistance and porosity during the PEM fuel cell operation. The contact behavior can be predicted very well by finite element analysis instead of experimental test.
Keywords:contact resistance; bipolar plate; gas diffusion layer; compressive pressure; porosity; finite element method
 
 
 

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