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Analysis of Thermal-mechanical Coupling Effect on Assembly Pressure in Proton Exchange Membrane Fuel Cell

Author: YanRongRong
Tutor: NiJun；LaiXinMin
School: Shanghai Jiaotong University
Course: Vehicle Engineering
Keywords: Coupled thermo Proton exchange membrane fuel cell Contact pressure Assembly A gas diffusion layer
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 85
Quote: 0
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Abstract


Proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC) is an efficient, clean energy conversion device, has a low working temperature, quick start, high efficiency, low pollution, high power density advantages, is expected to replace the conventional engine to become the future The vehicle's main power source. In the assembly process of the fuel cell, the distribution of the contact pressure of the membrane electrode assembly (Membrane Electrode Assembly, MEA) have a major impact on the contact resistance, as well as the porosity of the GDL. The one hand, an excessively small assembly pressure will cause the contact resistance of the bipolar plate with GDL interface is too large, affect battery performance, or even cause the seal is not good, and the reaction gas leakage, and other serious consequences; the other hand, too large a mounting pressure caused GDL reduce the porosity and GDL invade the amount of flow channel increases, resulting in increased difficulty of mass transfer, or even lead GDL VALID, thereby reducing the performance of the fuel cell. Fuel cell stack assembly usually at room temperature, the start temperature varies with the environmental changes, and stable operation of the temperature at about 80 ℃, the stack thermal expansion and contraction between the various components of the thermal coupling effect causes the stack assembly pressure control is very difficult. In this paper, the contact pressure between the MEA and the bipolar plate as the main research object, using a combination of numerical simulation and experiment method to analyze the contact pressure on the size of the MEA in PEMFC running in the heat - assembly pressure coupling (thermodynamic coupling effect) and the distribution of the impact of the law. The research work in the following aspects: 1. Assembly of fuel cell thermal coupling modeling method: This article first introduces the theoretical basis of the finite element modeling of the electric heap assembly coupled thermo, including the basic equation of the establishment of the basic solution (especially nonlinear the solution of the problem), temperature stress basic equations and solution, etc.; combined with the characteristics of the fuel cell stack assembly, analysis and select a stack modeling and solving the need of a suitable method, laid a theoretical foundation for simulation modeling. 2 fuel cell stack assembly coupled thermo simulation analysis: the use of finite element analysis software ABAQUS of fuel cell stack thermal coupling effect of numerical simulation, including end plates, seals, bolts, nuts, bipolar plates and MEA the three-dimensional PEMFC stack model to simulate the temperature changes by applying a temperature field, by applying a preload to simulate the bolt - nut connected to the pressure of the assembly, there is a larger impact derived thermodynamic coupling effects on MEA size and distribution of the contact pressure and the end plate material, the different effects of the geometric dimensions of the stack assembly pressure. Fuel cell stack assembly experimental study of thermal coupling effect: the establishment of a fuel cell assembly thermal coupling effects of experimental research program to study investigated different assembly process under the conditions of the thermal coupling effect of the electric heap MEA contact pressure size and distribution, experimental found that the thermal coupling effect makes the MEA plate ridge contact portion of the contact pressure increased significantly. Final analysis of the compensation effect of the seal thickness of the thermal coupling effect, to provide a reference for the fuel cell stack assembly.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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