The Design Of Lithium-ion Battery Management System For Electric Vehicle Based On STM32

In recent years,with the improvement of people's living standards,the number of cars in the world has increased significantly,in which the huge number of traditional fuel vehicles exacerbated the problems of the energy crisis and environmental pollution.Therefore,countries around the world have proposed to vigorously develop the electric car to solve the energy and environmental problems on the development of the automotive industry constraints.When the power is provided by the power battery for the electric car,it need to always show the battery remaining power and to ensure safe and reliable operation of the battery,which requires a dedicated system to manage the battery.Battery management system can extend the battery working life,reduce maintenance costs,to maximize the increase in electric vehicle mileage.In this thesis,according to the standard of electric vehicle selection of power battery,the power battery uses the type of SE60AHA lithium iron phosphate battery in this designed system.And according to the characteristics of lithium iron phosphate battery,the battery PNGV equivalent circuit simulation model is established.And the correctness and rationality of the system design are verified under the conditions of constant discharge and dynamic.The influence of temperature,discharge rate and other factors on the accuracy of SOC estimation is analyzed,and the Kalman filter algorithm is used to estimate the SOC of the battery.Then,the battery SOC estimation simulation model is built with the battery PNGV equivalent circuit,and the correctness of the simulation model is verified under the conditions of constant current discharge and the dynamic.In the aspect of hardware design,the STM32F103ZET6 microcontroller that produced by ST's companies is chosen as the main controller of the system,and chose AD7280A battery monitoring chip produced by ADI's companies to measure battery parameters.According to the circuit function,the hardware circuit is divided intomain control part,sampling part,equalization part and communication part,and the specific circuit is designed to achieve the each part of functions.For the aspect of software design,in the keil uVision 5 development environments,compile code to achieve each of the procedures,and use software simulation to verify the correctness of the code.Finally,the system functions are tested to verify the designed system whether meet the demand in the practical application.