Fuel cell internal temperature-humidity-current density synchronous measurement sensor

Abstract

The invention discloses a fuel cell internal temperature-humidity-current density synchronous measurement sensor and belongs to the field of fuel cell internal parameter measurement. Each temperature-humidity-current density synchronous measurement sensor body is made by a vacuum evaporation coating method and comprises ninth layers of films, the first layer is a silicon dioxide insulation layer, the second layer is a bottom electrode aluminium coating, the third layer is coated with a high molecular polymer humidity-sensing medium, the fourth layer is coated with a top electrode aluminium coating by evaporation, the fifth and sixth layers are respectively coated with a film thermocouple copper coating and a film thermocouple nickel coating by evaporation, the seventh layer is a silicon dioxide protection layer, and the eighth and ninth layers are coated with a current density measurement copper coating and a current density measurement gold coating respectively by evaporation. One ends of leads are connected with the temperature-humidity-current density synchronous measurement sensor bodies while the other ends extend to the edges of a flow field plate for transmitting electrical signals. Synchronous measurement of internal temperature, humidity and current density of a fuel cell is realized, special modification on the structure of the fuel cell is not required, and the sensor can be arranged on the fuel cell flow field plate with flow channels of various shapes.

Description

technical field [0001] The invention belongs to the field of fuel cell internal parameter measurement, and relates to the measurement of fuel cell internal temperature, humidity and local current density, in particular to a fuel cell internal temperature-humidity-current density joint measurement sensor. Background technique [0002] The performance of fuel cells is affected by many factors, such as temperature, humidity, reaction gas concentration, flow rate, etc. Through the measurement of the internal temperature, humidity and current density of the fuel cell, it can reflect the mechanism of various influencing factors on the performance of the fuel cell, so the measurement of the internal parameters of the fuel cell has attracted more and more attention of researchers. [0003] For temperature measurement, most of the traditional measurement methods are to implant thermocouples, thermal resistors or miniature temperature sensors into the fuel cell or to integrate them wi...

AI Technical Summary

Problems solved by technology

Since there are many factors affecting the performance of fuel cells, multiple disassembly or structural changes will have a great impact on its performance, which also makes the comparison of before and after data lack accuracy

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