The Research And Development Of PEMFC Individual Cell Voltages Detector And Electronic Load

Fuel cell is a highly efficient and clean energy with low noise and less pollution. Today, when the energy problems are emerging, fuel cell due to its advantages has become hot spot in Global Energy Studies. In the fixed power plants, motor vehicles and consumer electronics fuel cell technology has been in the application. In the past several decades, studies in proton exchange membrane fuel cell technology (PEMFC) have made great progress. With its'prominent characteristics such as: quick start at room temperature, convenient drainage, long service life, as well as high power and energy efficiency, fuel cell is particularly suited for electric cars, portable devices as momentum.In addition to its internal electrode performance and battery manufacturing process, the monitoring system is also an important factor that affects the performance of proton exchange membrane fuel cell system. In the operation of a proton exchange membrane fuel cell system, battery monitoring system can regulate the flow of fuel, the speed of motor, the switch of fan and ensure a high efficiency operation of the PEMFC system according to the actual operation states and the requests of load of the PEMFC system.In the monitoring system, fuel cell monomer voltage detection system is a very important part. Because of the core of a proton exchange membrane fuel cell system is fuel cell stack which is composed of several plates of individual PEMFC that can carry out independent electrochemical reaction in series, and each individual fuel cell plate has a normal and safe output voltage range in the process of being activated and normal operation, if a output voltage of a veneer of fuel cell is not within the normal range which means there may be a failure in this veneer of fuel cell, the whole PEMFC system will cease to function. Besides that, fuel cells are vector of electrochemical reaction, a failure of a fuel cell veneer even erode the whole fuel cell stack which is the core of a PEMFC system. Therefore, to ensure that every fuel cell veneer is in normal operation is a necessary prerequisite for safe operation of the whole PEMFC system. Therefore detecting whether each fuel cell veneer functions well through detecting the voltage of every fuel cell veneer becomes a very important link in the normal operation of a fuel cell system.In the proton exchange membrane fuel cell monitoring systems, fuel cell monomer voltage detection system is a relatively independent part. Individual fuel cell battery voltage detection system can be integrated in the fuel cell control system as a subsystem of monitoring system, and can also be independent of the fuel cell monitoring system in the form of individual fuel cell voltage detector which can be used outside of the PEMFC system independently.Electronic load is another important detecting device both in the research and development phase and the normal operation of a fuel cell system. The basic principle is that electronic load simulates common loads or particular loads that of a fuel cell system or other power supply system to detect the output voltage, current and power of a power supply system in the corresponding different load cases. This is very important and effective in detecting the actual scope of the output of a fuel cell system in the process of developing a fuel cell system.This study of this thesis is based on the purpose of using good monitoring system to ensure normal operation and effective functioning of the fuel cell system and on the basis of PEMFC system developed in laboratory to develop PEMFC individual battery voltage detector and electronic load.In sum, my main task is to:1. Design and realize the hardware of PEMFC individual battery voltage detector to achieve itinerant voltage detection of individual fuel cell of the fuel cell stack.2. Design and realize electronic load. 3. Explore better methods to improve the reliability and economy of detection modules.