Design,Development And Performance Verification Of Automotive Fuel Cell Thermal Management System

In the context of global energy shortage and climate warming,Proton Exchange Membrance Fuel Cell(PEMFC)has gradually become an alternative power source for traditional automotive energy due to its low operating temperature,high energy density,high reliability,fast and convenient Fuel filling,and pollution-free water products.In the course of the fuel cell car running,the temperature of the fuel cell characteristics of pile has enormous influence on the performance,a good performance of pile thermal management system can satisfy the need of electric reactor cooling and heating,and ensure the stable temperature in the operation in a reasonable scope,thus improve the electrical output power,prolong service life.Therefore,it is of great significance to study the fuel cell thermal management system.Based on the temperature characteristics,thermal management system model and control methods of PEMFC,this paper introduces the research status at home and abroad,and introduces the significance and main research contents of the topic.Thesis depends on the province to build project "high-specific power fuel cell engine key technology research and platform development",first embarks from the pile of single battery mechanism,through the fuel cell activation polarization,ohm polarization,concentration polarization theory of overvoltage in MATLAB/Simulink platform structures,the output voltage model of pile,and through the test experiment proves that the model accuracy,and on this basis,the analysis of pile temperature characteristic.Secondly,the thermal generation of the electric reactor was analyzed,the design performance objectives and temperature control requirements of the vehicle fuel cell thermal management system were defined,the layout of the electric reactor radiator modules in the front cabin was determined,and the convective heat transfer coefficient of the cold plate was calculated.The loop structure of the vehicle fuel cell thermal management system is built on the gt-suite platform,and an improved and optimized control method is proposed based on the theoretical analysis of the deficiencies of the traditional control strategy of water pump and fan in the thermal management system.Then,according to the performance goal of the thermal management system design,the parameters of each component in the loop are calculated and matched.Finally,starting from the energy path of vehicle fuel cell electric reactor and power battery dual power source,the vehicle energy management strategy is built on the gtsuite software platform according to the different operation modes of the vehicle,which is used as the vehicle condition of thermal management system after simulation verification.In this paper,three operating conditions of extreme high and low temperature conditions and normal temperature conditions are selected as the operating conditions for model verification,and the specific performance of the thermal management system designed in this paper under vehicle operating conditions is obtained respectively,and the performance of the heat pipe system is verified based on this.