Fuel cell internal humidity-current density combined measurement sensor

Abstract

The invention discloses a fuel cell internal humidity-current density combined measurement sensor, which belongs to the field of fuel cell internal parameter measurement, comprises seven layers of films, and is prepared by a vacuum evaporation coating method; a first layer is a silicon dioxide insulating layer, a second layer is a lower electrode aluminum coating, a third layer is a polymer coated humidity sensing dielectric layer, a fourth layer is an upper electrode aluminum coating, a fifth layer and a sixth layer are respectively a current density measurement copper plating and a current density measurement gold plating which are deposited on the silicon dioxide insulating layer by vapor deposition, and a seventh layer is a silicon oxide protective layer. The fuel cell internal humidity-current density combined measurement sensor is arranged on a ridge of a fuel cell flow field plate, one end of a leading wire is connected with the humidity-current density combined measurement sensor, and the other end of the leading wire extends to the edge of the flow field plate. The fuel cell internal humidity-current density combined measurement sensor has the advantages of simple structure and small volume, can be conveniently arranged on fuel cell flow field plates in various shapes, and can realize the synchronous combined measurement of fuel cell internal humidity and current density.

Description

technical field [0001] The invention belongs to the field of measuring internal thermal parameters of fuel cells, and relates to the measurement of humidity and current density inside fuel cells, in particular to a humidity-current density joint measurement sensor inside fuel cells. Background technique [0002] During the operation of the fuel cell, its internal environment is constantly changing. At the start-up stage, the proton exchange membrane has not been wetted, which affects the transfer of protons in the proton exchange membrane, which requires an increase in reaction Humidity of the gas, in order to fully wet the proton exchange membrane; and as the operating time increases, water will be generated inside the fuel cell, if the humidity is too high, too much condensed water will be generated, causing the internal membrane electrodes to be flooded, thus The performance of the fuel cell is greatly reduced, therefore, it is particularly important to monitor the humidi...

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Problems solved by technology

[0004] Current density measurement methods include sub-cell method, membrane electrode segmentation method, magnetic ring group method, etc. Most of them need to modify the structure of the fuel cell, which is complicated to manufacture; the humidity can be measured by implanting a commercial humidity sensor inside the fuel cell. However, it is also necessary to modify the flow field plate of the fuel cell, and the process is complicated and the cost is high. At the same time, the fuel cell needs to be disassembled and assembled several times to measure the humidity and current density inside the fuel cell, which also destroys the fuel cell. Accuracy of Measurement Data

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