Multi-scale correlation method for proton exchange membrane fuel cell

Abstract

The invention relates to a multi-scale correlation method for a proton exchange membrane fuel cell. The method is characterized in that complicated physical and chemical phenomena such as coupled mass and heat transfer, an electrochemical reaction and the like in the proton exchange membrane fuel cell are subjected to modeling of macroscopic sizes of a monocell and parts as well as microscopic scales of a gas diffusion layer, a catalytic layer and a proton exchange membrane which have a micron structure, a submicron structure and a nano-porous structure respectively, multi-scale correlation and simulation. A fractal-based modeling method proposed by the invention adopts a mechanism modeling method in microscopic scale, so that a model is clear in physical meaning and high in accuracy. A parameter transmission method is adopted for coupling of a microscopic model and a macroscopic model, so that multi-scale correction of a transmission mechanism in the monocell can be realized, the defect that existing multi-scale simulation calculation is complicated can be made up for, the transmission mechanism in the proton exchange membrane fuel cell can be understood more essentially and objectively, and a brand-new means is provided for exploring an optimal porous layer microstructure and optimization design of the porous layer microstructure.

Description

technical field [0001] The invention relates to a simulation method of an energy system, in particular to a multi-scale simulation method of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells have the characteristics of working at room temperature and fast start-up, and have become a research hotspot in the world. In order to improve the cell performance, in-depth study of the transport phenomena and their mechanisms in proton exchange membrane fuel cells is required. Proton exchange membrane fuel cells have multi-scale complex structures, and their multi-scale performance ranges from the macroscopic dimensions of the cell and its components to the microscopic dimensions of the gas diffusion layer, catalyst layer, and proton exchange membrane with micron, submicron, and nanoporous structures, respectively. scale. Battery performance is closely related to both the macroscopic dimensions of the component and the microstruc...

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Problems solved by technology

At present, scholars at home and abroad have applied this method to carry out related research on the diffusion layer, catalytic layer and membrane electrode. However, for such a complex and complete object as the proton exchange membrane fuel cell, the molecular dynamics method requires a huge amount of calculation. difficult to solve

[0005] To sum up, for the multi-scale transport phenomena in proton exchange membrane fuel cells, it is difficult to describe the fuel cell completely and accurately only by using the continuum model based on macroscopic mechanics or the first-principles method based on quantum mechanics. and its structure from microscopic to macroscopic interrelated properties, while only using molecular dynamics methods, the computational power is insufficient

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