A test fixture for quasi-in-situ detection of membrane electrode perforation points using infrared thermal imaging

Abstract

The invention discloses a test fixture for quasi-in-situ detection of membrane electrode perforation points using infrared thermal imaging, including an anode end plate, an anode metal current collector plate, an anode flow field plate, a fixed frame, an integrated cathode flow field plate and a connecting rod , the anode end plate, anode metal current collector plate, anode flow field plate, fixed frame, and cathode flow field plate are respectively arranged on both sides of the membrane electrode, and the connecting rods run through the two sides of the fixed frame in parallel and along the fixed frame The middle section is fixedly connected to the fixed frame, and the two ends respectively pass through the anode end plate, anode metal current collector plate, anode flow field plate and cathode flow field plate in sequence and are fixed by fastening devices. The test device provided by the invention has the functions of battery performance test and infrared hole measurement at the same time, which can realize quasi-in-situ detection of the perforation position of the membrane electrode, avoid damage to the membrane electrode during repeated disassembly, and realize the evolution process of the membrane perforation state The monitoring in the film is more conducive to the research on the mechanism of membrane perforation.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a test fixture for quasi-in-situ detection of perforation points of membrane electrodes by using infrared thermal imaging. Background technique [0002] Durability is currently one of the important obstacles restricting the large-scale commercialization of proton exchange membrane fuel cells, which mainly depends on its core components, membrane electrodes. Generally speaking, the membrane electrode mainly consists of seven layers, which are anode sealing frame, anode gas diffusion layer, anode catalytic layer, proton exchange membrane, cathode catalytic layer, cathode gas diffusion layer, and cathode sealing frame. During the long-term durability test, the proton exchange membrane will undergo chemical degradation and physical degradation, and then form pinholes, cracks, and thinning, resulting in an increase in the hydrogen permeation current. After a longer period of opera...

AI Technical Summary

Problems solved by technology

However, for applying this method to an actual single cell, the membrane electrode with suspected perforation is often taken out of the test fixture and then reinstalled in a specially designed infrared test fixture. The disadvantages of this method are: on the one hand , the membrane electrode needs to be replaced into a custom-made infrared fixture for testing after removal, which may cause permanent mechanical damage to the membrane electrode

On the other hand, there may be many perforation positions in the final state, and it is impossible to effectively identify the formation time of each point and the impact on the performance or durability of the membrane electrode.

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