Spot test method and test device for fuel cell stack membrane electrode conditions

Abstract

The invention discloses a spot test method and a test device for fuel cell stack membrane electrode conditions. Hydrogen and nitrogen or air are supplied to to-be-tested fuel cells, fuel cell voltage is removed through loads until zero, constant current charging is carried out on the to-be-tested fuel cells by adopting a constant-current power supply, a charging current is measured by a current sensor, current signals of the current sensor and voltage signals of each of the to-be-tested fuel cells are collected by a data collector, converted into digital quantity signals and transmitted to a data processing unit, automatic processing of measured data is achieved through program writing by the data processing unit, and parameters such as catalytic agent effective and active area, double-layer capacitance, hydrogen permeation current and impedance of membrane electrodes of the to-be-tested fuel cells are provided through differential and integral operation on collected voltage data of each fuel cell. The spot test method and the test device for the fuel cell stack membrane electrode conditions are suitable for testing a fuel cell stack or a single fuel cell, and has the advantages of being spot, free of damage, simple and convenient, fast and the like.

Description

technical field [0001] The invention relates to the technical field of fuel cell membrane measurement, in particular to an on-site detection method and a detection device for the state of a fuel cell stack membrane electrode. Background technique [0002] Membrane electrodes are key components of fuel cells, and fuel cell performance degradation is essentially the aging of membrane electrodes. The status parameters of the membrane electrode include the effective active area of ​​the catalyst, the electric double layer capacitance, the hydrogen permeation current and the impedance, etc. The effective active area and impedance of the catalyst are directly related to the output performance of the fuel cell. Detecting these two parameters of each fuel cell in the battery stack can reflect the consistency and aging degree of each fuel cell; hydrogen permeation current, in essence, represents the membrane electrode The equivalent current of permeated hydrogen reflects the compact...

AI Technical Summary

Problems solved by technology

[0004] For newly produced fuel cell stacks or fuel cell stacks in use, it is often necessary to know the consistency of each fuel cell in the stack (especially the consistency of the membrane electrodes) and the change of the membrane electrodes. There is a lack of a convenient way to detect fuel cells. Method and measuring device for stacked membrane electrode

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