Internal moisture distribution forecast method of proton exchange membrane fuel cell

Abstract

The invention discloses an internal moisture distribution forecast method of a proton exchange membrane fuel cell. The internal moisture distribution forecast method is used for building a three-dimensional numerical value model and performing solving calculation and comprises five steps of building and calculating a conservation equation of membrane-state water Lamba distribution situation in a proton exchange membrane and a catalytic layer; building and calculating a conservation equation of water distribution situation in a gas diffusion layer, a micropore layer and the catalytic layer; solving liquid-state water distribution in a runner of the fuel cell; defining mass conservation of two sides of an interface of the runner and the gas diffusion layer; and building an energy conservation equation in an integral calculation domain, and acquiring temperature distribution. Simulation calculation is performed on flowing of a gas phase and a liquid phase in the runner of the proton exchange membrane fuel cell by a two-phase flow model, surface tension and a wall-surface absorption effect are considered, the flowing of a gas phase and a liquid phase in a membrane electrode (the gas diffusion layer, the micropore layer, the catalytic layer and the proton exchange membrane) is combined with the flowing of a gas phase and a liquid phase in the runner of the proton exchange membrane fuel cell by a special method, and a method for forecasting the distribution of the internal whole water in a single proton exchange membrane fuel cell under a given working condition by numerical value calculation is provided.

Description

technical field [0001] The invention belongs to the field of electrochemical fuel cells, in particular to a method for predicting and calculating the performance of fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an electrochemical reaction power device that directly converts chemical energy in fuel into electrical energy, has the advantages of zero emissions and high power density, and is widely considered to be the most likely to replace internal combustion engines in the future. The power machinery of the automobile power source. However, there is still a lot of room for improvement in the performance and life of proton exchange membrane fuel cells, and the quality of water management is one of the key factors affecting its performance. [0003] The reason for water management in PEMFC is that the PEMFC needs to maintain a certain water content to maintain high performance. At the same time, since the PEMFC water is only produced a...

AI Technical Summary

Problems solved by technology

However, due to the different components of the proton exchange membrane fuel cell and the different forms of water in different parts, it is generally difficult to obtain the overall water distribution inside the cell at the same time

At present, most of the researches on the internal water distribution of fuel cells divide fuel cells into membrane electrodes (including: gas diffusion layer (GDL), microporous layer (MPL), catalytic layer (CL) and proton exchange membrane (Membrane)) and Two parts of the flow channel, or ignore the influence of liquid water in the flow channel on the water distribution of the membrane electrode, or only study the influence of the gas-liquid two-phase flow in the flow channel on the fuel cell drainage. Obviously, these two research methods have their limitations and cannot Accurately reflect the overall water distribution inside the proton exchange membrane fuel cell under specific working conditions

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