Fuel cell internal temperature-humidity distribution measurement insert

Abstract

The temperature-humidity distribution measurement insert inside the fuel cell is a measuring device for the temperature distribution and humidity distribution inside the fuel cell. It is provided with leaks and ribs corresponding to the flow channels and ridges of the flow field plate of the fuel cell on the conductive substrate, and A temperature-humidity joint measurement sensor is arranged on the rib; the temperature-humidity joint measurement sensor is made by vacuum evaporation coating method, including seven layers of film. The lead wire is also made by vacuum evaporation coating method, which is used to transmit electrical signals. When it extends to the edge of the flow field plate, it is enlarged to form a pin, so as to facilitate connection with external data acquisition equipment. The invention realizes the synchronous online measurement of the temperature distribution and humidity distribution inside the fuel cell, can be installed inside the fuel cell as an independent component, reduces the damage to the fuel cell structure, and can be adapted to parallel flow channels and serpentine flow channels , staggered flow channel or other flow channel shape fuel cell flow field plate.

Description

technical field [0001] The invention relates to an insert for measuring the temperature-humidity distribution inside a fuel cell, belonging to the technical field of fuel cell detection. Background technique [0002] In the operation of fuel cells, temperature and humidity are two very important parameters. The uniformity of their distribution can also reflect the uniformity of electrochemical reactions on the surface of fuel cell membrane electrodes, which has a great impact on the performance of fuel cells. [0003] The electrochemical reaction inside the fuel cell is the main source of heat inside the fuel cell. Due to the compact structure of the fuel cell, the internal temperature field is not uniform, which in turn will affect the electrochemical reaction of the fuel cell; Heat accumulation and abnormal temperature rise beyond the appropriate range will lead to performance degradation or even failure of the membrane electrode. Humidity is an important factor affecting...

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Problems solved by technology

[0004] Most of the temperature measurement methods are to embed miniature temperature sensors, thermocouples or thermal resistors in the flow channel of the fuel cell, or integrate them with the membrane electrode of the fuel cell by hot pressing, which often requires special modification of the structure of the fuel cell, which is not only Destroying the overall structure of the fuel cell also has a great impact on the performance of the fuel cell; for the means of humidity measurement, the method is to measure the humidity inside the fuel cell by opening holes in the flow field plate of the fuel cell and implanting a commercial humidity sensor. Measurement, this method requires special processing and transformation of the flow field plate of the fuel cell, which is difficult to process and has certain destructive effects on the sealing of the fuel cell; there is also a method of measuring by using an etching process to make a humidity sensor, The manufacturing process of this method is relatively complicated, and the manufacturing cost is high.

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