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Instruments and Systems: Monitoring, Control, and Diagnostics

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Relaxation Processes of Solid Polymer Hydrogen Fuel Cells Batteries and Estimating of Their Diagnostic Properties
T.P. NIKISHIN, E.S. DENISOV, N.A. ADIUTANTOV

The paper considers relaxation processes in hydrogen fuel cell stacks with a solid polymer electrolyte caused by a stepwise change of the load current. It is shown that the relaxation process under consideration can be represented as the sum of the instantaneous voltage jump and the damping time function. The relaxation process at the initial moment of time can be described by an exponential mathematical model and presented in the form of an equivalent first-order RC-circuit. It has been experimentally shown that relaxation processes depend on the magnitude of the load current and change during the hydrogen fuel cell stack degrades. It was determined that the relaxation characteristics reflect the features of physicochemical processes inside fuel cells with a solid polymer electrolyte. The parameters of the mathematical model and the equivalent electric circuit reflect a change in the characteristic properties of relaxation processes and can be considered as diagnostic feature. A diagnostic method based on the analysis of the parameters of relaxation processes can be used as an alternative to impedance spectroscopy for real-time systems, since its implementation requires less computational and time costs.
Keywords: fuel cell, fuel cell stack, solid polymer electrolyte, transient, relaxation process, diagnostics, equivalent circuit.


DOI: 10.25791/pribor.07.2020.1187

Pp. 01-12.

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