平板式固体氧化物燃料电池的热机械行为

Thermomechanical Behavior of Planar Solid Oxide Fuel Cell

基于COMSOL Multiphysics仿真平台建立了多物理场耦合作用下的平板式固体氧化物燃料单电池模型,考虑多种温度相关的材料物理化学性质,研究了残余应力以及阳极材料中镍体积分数对电池内部热应力的影响。结果表明:残余应力的存在增大了电池关键构件电解质和阴极电极工作状态下的最大拉伸和压缩应力,减小了阳极电极的最大拉伸应力而增大了其最大压缩应力;阳极镍体积分数的增大会使电池各构件的最大拉伸应力呈现先减小后增大的趋势,阳极镍体积分数的最佳百分比为40%~60%。

A single planar solid oxide fuel cell model considering various temperature-dependent physical and chemical properties of the materials was proposed via multi-physics coupling based on the COMSOL multiphysics simulation platform. The effects of residual stress and nickel volume fraction in the anode material on the internal thermal stress of the fuel cell were investigated. The results show that the existence of residual stress increases the maximum tensile and compressive stresses of the electrolyte and the cathode electrode under working conditions, reduces the maximum tensile stress of the anode electrode and increases its maximum compressive stress. The increase in the volume fraction of nickel in the anode electrode firstly decreases and then increases the maximum tensile stress of each component of the SOFC. The optimal percentage of nickel volume fraction in the anode electrode is 40%–60%.