The sealing structure components of proton exchange membrane fuel cells (PEMFCs) inevitably have misalignment deviations during assembly,which affect the performance and safe operation of the stack.To study the influence of the geometry and material parameters of the sealing components on the failure of the sealing structure during the assembly process of PEMFCs,a numerical model of the sealing structure in the assembly process was established.The slip distance and slip angle were used as the failure indicators to judge the sealing structure,and the influences of the gasket hardness and size,the thickness and material elastic modulus of membrane electrode (MEA) on the failure of the sealing structure were discussed.The results show that the slip distance and slip angle increase with the increase of gasket hardness and thickness,and decrease with the increase of gasket width,MEA frame thickness and material elastic modulus,which indicates that the geometric and material parameters of the sealing component in PEMFC have a significant impact on the stability of the sealing structure.The selection of sealing gaskets with smaller hardness and thickness,and larger width,as well as MEA frames with larger thickness and higher elastic modulus,can reduce the impact of misalignment deviation on the sealing structure and expand the allowable assembly error range of the structure.This research is beneficial to the understanding of seal structure failure,and can also be used to guide the design of PEMFC assembly processes.