质子交换膜燃料电池气体扩散层的力学改进模型

Improved mechanical model of gas diffusion layer in proton exchange membrane fuel cell

针对质子交换膜燃料电池膜电极结构力学特性复杂,导致工程中的仿真分析结果难以与真实情况吻合的问题,对膜电极结构中气体扩散层的复杂力学行为进行描述,进而改进燃料电池力学仿真的准确性。首先,提出了气体扩散层微观结构的改进模型,并通过实验的方法确定了模型参数。然后,利用UMAT用户子程序在Abaqus中进行有限元仿真验证。实验与仿真结果表明,本文力学改进模型能够较好地模拟气体扩散层的非线性力学行为,可以提高燃料电池工程仿真的准确度,可应用于燃料电池装配及机械寿命预测的工程分析中。

Aiming at the problem that the mechanical properties of the membrane electrode structure of the proton exchange membrane fuel cell are complex,which makes the simulation analysis results in engineering difficult to match the real situation,the complex mechanical behavior of the gas diffusion layer in the membrane electrode structure was described,and then the accuracy of fuel cell mechanics simulations was improved.First,an improved model of the microstructure of the gas diffusion layer was proposed,and the model parameters were determined by means of experiments.Then,the finite element simulation verification was carried out in Abaqus using the UMAT user subroutine.The experimental and simulation results show that the improved mechanical model can better simulate the nonlinear mechanical behavior of the gas diffusion layer,improve the accuracy of fuel cell engineering simulation,and can be applied to the engineering analysis of fuel cell assembly and mechanical life prediction.