Power Battery Voltage And Current From Learning Management Control System

Along with the continuous development of industry, the world’s energy resources,especially oil resources, are dwindling. The energy crisis has been an important issueswhich need to be solved as quickly as possible. Climate change and air pollution isthreatening the living environment of mankind. In the whole world, environmentalprotection technology and energy saving technology research has been taken in allwalks of live. In the automotive industry, the electric vehicle is an environmentalprotection and energy saving product. The essential difference between electric vehicleand conventional vehicle is that electric vehicles are driven by electricity. As the energystorage device, power battery is one of the key technologies for pure electric vehicle. Atpresent, most of domestic electric vehicles’ power batteries are made up of largecapacity battery. Battery pack used in this thesis is a small-capacity lithium-ion battery.A lithium-ion battery box with certain capacity and power is composed by thesesmall-capacity lithium-ion battery. In this paper, the key technologies of using thisbattery box to compose power battery have been taken into research. The author tries todesign the corresponding battery management system.The history of electric vehicles has been described. The development of electricvehicles indates its necessity and importance. Technologies about power battery andpower battery management system are described in the thesis. And then, parameters ofthe small-capacity lithium-ion battery are described, and through experiments on thelithium-ion battery, the current intensity, discharge mode and the environmenttemperature’s influence in discharge process are studied. The electrical parameters andthe system structure of the small-capacity and high voltage battery box are introduced.Embedded system design method has been applied to design the overall structure of thecontrol system for battery pack management system. The network topology of thecontroller and means of communication of battery management system are designed.Power supply circuit of control system, clock and reset circuit, JTAG debug interfacecircuit, TWI communication interface circuit, CAN bus communication circuit are alldesigned. UCOS-Ⅱ embedded operating system is used to design battery management system software. KEIL software development tools and ULINK emulator are used totransplant UCOS-Ⅱ embedded operation system to at91sam7s64micro controller.Method of using UCOS-Ⅱ to design management system software is introduced.In this thesis, so-called self-learning parameters of current integration SOCestimation method has been introduced to forecast battery’s state of charge. Defects ofthe traditional current integration SOC calculation method will be solved. Based onaccurate SOC calculation, parallel battery box voltage balancing strategy and thecapacity of the series battery balancing strategy are separately described.