Research On Internal Parameter Monitoring Technology Of Proton Exchange Membrane Fuel Cell

Proton exchange membrane fuel cell(PEMFC)is a power generation system that combines physical and chemical reactions,by which clean renewable fuels can be efficiently converted into electricity.Its performance depends on the input operating parameters and real-time regulation of fuel cell operating conditions.The internal parameters are dynamic when the fuel cell is working,so it exists the phenomenon that current density and temperature are unevenly distributed.At this time,the in-situ monitoring of the internal parameters of the battery is especially important to ensure its normal operation.At present,many PEMFC parameter monitoring technologies are destructive or unable to achieve in-situ monitoring.This paper focused on the internal parameter monitoring technology of PEMFC,through the combination of simulation and experiment,the influence of micro-sensors on the performance of PEMFC was studied.The internal temperature and current density distribution of the fuel cell were also studied.The main contents were as follows:Firstly,theoretical research on the distribution position of micro-sensors was carried out,and the mathematical model of PEMFC was established.The numerical simulation was used to study the temperature and current density distribution of anode flow field and cathode flow field.The influence of micro-sensors on the performance of PEMFC was analyzed.It was found that the sensor placed inside the flow channel had less influence on the performance of PEMFC,the distribution of temperature and current density in the anode flow field and cathode flow field was similar.Secondly,it introduces the principle of PCB serpentine flow field partitioning(PCB segmented technology and resistor network technology)and segmented mode,the sensors were designed according to the working principle of micro temperature sensor and voltage sensor.PCB circuit was designed combining with segmented flow field and micro-sensor,the segmented fuel cell was constructed,then the calibration experiment of micro-temperature and voltage sensor was introduced.Thirdly,the technical scheme of PEMFC internal parameter monitoring was introduced in detail,and the online monitoring hardware platform and software platform were built according to the requirements of the solution.The hardware platform included the PEMFC test bench,the segmented fuel cell and the signal acquisition instrument.The software platform was based on the LabVIEW to complete the design of the signal acquisition system.The temperature field was constructed by the monitoring data of micro-temperature sensors to realize temperature visualization.Finally,a series of comparative experiments were designed to study the effects of operation parameters and micro-sensors on the performance of PEMFC,as well as the distribution of fuel cell flow field temperature and current density,the effects of operation parameters on the performance of PEMFC were quantitatively analyzed and qualitatively summarized by monitoring data,the performance of PEMFC was decreased by 3.653% by deploying micro-sensors.The micro temperature sensor and voltage sensor realized the in-situ monitoring of the distribution of anode flow field temperature and current density,and the temperature and current density distributions of the battery under different operating parameters were obtained.In this paper,the design and development of micro-temperature sensor and micro-voltage sensor were completed by combining simulation and experiment,which provided a feasible technical means for fuel cell internal parameter monitoring.