Research And Design Of Battery Energy Management System For Electric Vehicle

With the rapid development of the society,electric vehicle has gradually become a pet of the new era due to its advantages and characteristics of environmental protection and energy saving.Electric vehicle has its unique advantages of energy saving,but the cost of electric vehicles,battery life,battery series of problems such as the use of security has been the critical factor that restricts the electric cars popular in electric vehicle research mainly is the study of electric vehicle battery pack,the study of electric vehicle battery pack is mainly on the research of the battery energy management system,namely the study of the working state of the battery pack testing.It mainly includes the real-time display of some parameters(current parameters,voltage parameters,temperature parameters,etc.)of the battery in the working process,the estimation of the remaining capacity of the battery,the estimation of the health of the battery,and the balance degree of the battery.By comparing the performance parameters of several common electric vehicle batteries,it is determined that lithium batteries in several common batteries have good performance characteristics and are ideal power sources for electric vehicles.Therefore,this topic is designed and studied for the lithium battery battery energy management system of electric vehicles.The main research contents include the following points:1.This topic introduces the performance parameters of lithium-ion battery,chemical properties and the working principle,on the basis of analysis of a large number of literature review,compared several kinds of SOC estimate method,the Ann combined with integral method and the open circuit voltage method to determine as the main method of estimate the SOC of the battery and lithium ion battery experiment platform,in the process of charging and discharging,estimate the SOC dynamic real-time validation.2.This topic according to the design requirements,make sure to complete the forecast method of SOC,overall scheme of project design,determine the battery energy management system overall scheme design,the design of each module,mainly including data acquisition module design(voltage sampling current,current,current,temperature acquisition circuit design),equalization circuit control module design,communication circuit module design,hardware design.3.In terms of hardware design,the main controller design is the core of this project.STM32f103 series chips can be used as the main control chip of battery energy management system due to their powerful functions,superior computing power,low power consumption,high working frequency and high integration.Then,according to the requirements of the subject,the circuit design of each module is carried out to form a complete circuit design of the battery energy management system.In terms of software,I used C language software programming to complete the programming design and debugging of the main controller and various functional modules based on keil software.According to the design of software and hardware,complete the design and manufacture of electric vehicle battery energy management system.4.The performance test bench of the battery energy management system was built and the battery energy management system was experimentally tested.The experimental test results showed that the battery energy management system of electric vehicle was functional and stable,and could manage the battery energy of electric vehicle.The battery energy management system can collect battery current,voltage and temperature signals accurately.It can accurately predict the charged state of lithium battery of electric vehicle,and effectively improve the battery performance of lithium battery of electric vehicle,and increase the battery life.