Optimization Design Of Endplate Structure Of High Temperature Proton Exchange Membrane Fuel Cell

High temperature proton exchange membrane fuel cell(HT-PEMFC)is a new type of energy source that uses hydrogen and oxygen as fuel gas for redox reaction to generate electricity.This type of power generation device is also environmentally friendly due to the production of water.In addition,HT-PEMFC also has the characteristics of long service life,high power generation efficiency,fast use response,and small product volume.It is widely used in,It has great development prospects in automobiles,aerospace and military.However,at the same time,the uneven distribution of the contact pressure within the stack will cause the power generation efficiency of the high-temperature proton exchange membrane fuel cell to decrease.In addition,the quality of the end plate also affects the cost and portability of the entire fuel cell stack through optimization of the stack end plate,the quality of the stack end plate is reduced,and the uniformity of the contact pressure on the lower surface of the stack end plate is improved.In this paper,we must first perform finite element simulation analysis of the existing end plate.Before the simulation,simplify the design of the model according to the equivalent stiffness theory to save calculation and reduce the amount of calculation,and perform simulation analysis according to the working conditions of this article to obtain the initial conditions for structural optimization.In order to achieve the goals of improving the working efficiency of the fuel cell stack and reducing the quality of the stack end plate,this paper uses topological optimization,shape optimization and size optimization to optimize the design of the stack end plate,and proposes to evaluate the uniform contact pressure of the stack end plate Performance index(coefficient of variation)and the evaluation index of the overall quality of the stack(evaluation index C).In this paper,the variable density method is used to perform topology optimization on the end plate,and then shape optimization is performed in the modeling software.Finally,one of the structures is optimized for size using proxy model and genetic algorithm,and the newly designed end plate structure is evaluated.It can be seen that the quality of the optimal end plate structure is reduced by 45.12%,the uniformity is improved by 47.76%,and the overall performance is improved by 46.44%.It can be seen that the use of this optimization method will greatly improve the performance of the stack,and can provide a new idea for the design of the stack end plate.