An online proton exchange membrane fuel cell fault diagnosis method based on an impedance spectrum

Abstract

The invention discloses an online proton exchange membrane fuel cell fault diagnosis method based on an impedance spectrum. The method includes: Firstly, establishing an electrochemical equivalent circuit model of the proton exchange membrane fuel cell; performing measuring to obtain an electrochemical impedance spectrum of the proton exchange membrane fuel cell; fitting and solving parameters inthe electrochemical equivalent circuit model by using an electrochemical impedance spectrum; and then selecting a part of parameters as classification characteristics, carrying out classification processing on the proton exchange membrane fuel cells by using a fault diagnosis algorithm based on a binary tree support vector machine, and diagnosing faults such as membrane dryness, water logging andair starvation which easily occur in the proton exchange membrane fuel cells. The problem that fault detection is difficult in the operation process of the proton exchange membrane fuel cell is solved, the electrochemical impedance spectroscopy technology is applied to on-line operation monitoring and fault diagnosis of the fuel cell, and the reliability and durability of the cell can be improved.

Description

technical field [0001] The invention belongs to the field of fuel cell application and relates to an online proton exchange membrane fuel cell fault diagnosis method based on impedance spectrum. Background technique [0002] In recent years, environmental pollution and energy crisis have become increasingly serious. Due to its high conversion efficiency, high energy density, and no emissions, proton exchange membrane fuel cells have received extensive attention. There are good application prospects in all fields. However, the main reason affecting the commercialization of proton exchange membrane fuel cells is the durability and lifespan. During operation, due to complex power conditions and insufficient water and heat management, the stack is prone to failures such as water flooding, dry film, and air starvation. These failures can have a detrimental effect on the performance and structure inside the battery, which is the main reason for the short life and insufficient du...

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Problems solved by technology

However, the current research results of impedance spectroscopy are mainly qualitative analysis, and there is a lack of accurate and reliable algorithms for real-time analysis and diagnosis of impedance spectroscopy and evaluation of battery status.

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