Proton exchange membrane fuel cell flooding fault diagnosis method based on multiple physical fields

Abstract

The invention discloses a proton exchange membrane fuel cell flooding fault diagnosis method based on multiple physical fields. The method comprises the following steps: establishing a three-dimensional geometric model of a proton exchange membrane fuel cell; establishing a control equation, and setting physical fields for different areas of the geometric model to obtain a fault diagnosis model; performing mesh generation on the fault diagnosis model based on a finite element analysis method; and obtaining a cathode pressure drop curve and a battery polarization curve according to the fault diagnosis model after mesh generation, determining a fault state according to the battery polarization curve, and determining that a flooding fault occurs according to increase of the cathode pressure drop change rate. According to the invention, internal component distribution is observed through multi-physical field simulation PEMFC, and the method is provided according to the relationship between battery performance reduction and internal mass transfer and the relationship between inlet and outlet pressure drop and battery current density, so that the accuracy and reliability of flooding fault diagnosis can be improved.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, in particular to a method for diagnosing flooding faults of proton exchange membrane fuel cells based on multiple physical fields. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a new type of fuel cell that converts the chemical energy in the cell into electrical energy. Its working temperature is low, it can work continuously under high current density and low weight, large output, low potential, low cost, long stack life, fast speed, start-up and suitable for discontinuous operation, and the product is only water, which has little pollution to the environment . Although PEMFC has many advantages, its fault diagnosis has always been a research hotspot and an urgent problem to be solved, because during the operation of the proton exchange membrane fuel cell, water will be generated in its cathode catalytic layer, whether it is gaseous or...

AI Technical Summary

Problems solved by technology

However, many PEMFC water flooding simulation studies now mainly judge the degree of flooding directly by directly observing the simulated water distribution results, which lacks the combination with practical experimental applications.

Because the simulated results of water distribution inside the PEMFC are usually not directly observed in the experiment, there is a disconnect between the two

In practical applications, the judgment of flooding faults is usually done indirectly through indicators related to flooding, such as battery voltage, AC impedance spectrum, gas pressure drop at the inlet and outlet, etc., and the existing methods cannot take these indicators into consideration. influence, greatly reducing the accuracy and reliability of fault judgment results

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