Design And Research Of Lithium-ion Battery Management System On Pure Electric Vehicle

The development of automobile industry had played a important role in globalindustrial progress and economic development,but the problem of energy crisis andenvironment pollution has being increasingly prominent in today’s world.In thiscontext,many famous automobile manufacturers and research institutes focu on thedevelopment of electric car.It is very important to manage the vehicle battery packscientifically,cause it is the only power source.This paper designed BMS’ hardwareand software from the perspective of overall research.Main work is as follows:(1) Based on the research of the commonly used SOC estimation strategies,theiradvantages and disadvantages had been compared.This paper combined opencircuit voltage method with ampere integral method to estimate the SOC.(2) Main control board make the Freescale MC9S12XS128MCU as the control chip,data collection board make the MC9S08DZ60MCU as the core,AD7280as thelithium-ion battery acquisition chip,achieved to collect the parameters of voltageand temperature of twelve batteries.The data collection board shared the data withthe main control board through CAN bus.(3) A new type of voltage equilibrium method had been designed.Each single cellinside the battery pack based on AD7280to make passive equalization,and eachbattery pack based on storage circuit which composed of capacitance andinductance to make active balancing.For the safe module of BMS,the integratedoperational amplifier chip LM224D and dual voltage comparative chip LM293Dhad been utilized to design current leakage circuit,and it has the highest priority inprogram.(4) Software design based on modular idea for easy to transplant and maintenance,themain control board MCU based on the requirements of real-time and priority tomake selection and execution.For the system verification,through C#to write theserial port debugger and LabVIEW to design the upper computer,the function ofserial port had been validated,utilized the USBCAN module and correspondingdebugging tool to validate the communication of CAN bus.