装配压力对PEMFC气体扩散层影响的研究

Study on effects of assembly pressures on the gas diffusion layer for proton exchange membrane fuel cell

在质子交换膜燃料电池(PEMFC)装配过程中,为得到最佳装配压力以提高燃料电池性能,延长使用寿命,建立基于有限元分析法(ANSYS)的三维单通道质子交换膜燃料电池模型。通过此模型研究燃料电池模型在不同装配压力下的气体扩散层形变和应力分布情况,并模拟出气体扩散层顶部变形曲线。分析不同装配压力对气体扩散层形变量及孔隙率的影响,同时,结合气体扩散层形变后不同位置孔隙率的变化,得出最佳装配压力范围为1.5~2.0MPa。

In order to obtain the optimum assembly pressure during the assembly of proton exchange membrane fuel cell（PEMFC）,a three-dimensional single channel PEMFC model has been developed on the basis of finite element analysis（FEA） with a view to enhancing the performance of PEMFC and extending its service life.Through the model,the deformation and stress distribution of the gas diffusion layer（GDL） induced under different assembly pressures were studied,simulating the deformation curve of the top of GDL.It is concluded that the optimum assembly pressure is set in the range of 1.5 MPa to 2.0 MPa by combining the effects of different assembly pressures on the deformation and porosity of GDL with the variations of porosity in different positions after deformation of GDL.