Research And Design Of Reconfigurable Power Battery Management System Based On FPGA

Electric vehicles have the advantages of zero emission,low noise and high energy efficiency,and are the inevitable direction of vehicle development in the future.Battery management system is an important link connecting vehicle power battery and electric vehicle.It can not only collect,monitor and display parameters of battery cells such as voltage and temperature in real time,but also predict the health state of battery by using the collected data.According to the state of the battery,the circuit fault is protected and the charge balance is carried out for the inconsistency of the battery,so as to improve the safety and efficiency of the battery pack.This paper mainly studies the reconfigurable power battery management system.The specific work is as follows:(1)Overall structure design of reconfigurable power battery management system.The voltage characteristics and inconsistency of lithium cobalt oxide battery are analyzed,the management object and reconfiguration principle of the system are introduced,and the faulttolerant technology of the system is studied.Aiming at the three faults of short circuit,open circuit and thermal runaway,the experiment is designed,and the fault judgment and isolation methods are put forward.Then,the charge balance technology of the system is analyzed,and the charge balance strategy is designed according to the charge and discharge state of the battery pack.Finally,the overall scheme design of reconfigurable power battery management system is completed.(2)Hardware design of reconfigurable power battery management system.According to the overall scheme and specific functions of the system,each hardware module of the system is designed in detail,including MCU main controller module,voltage and current acquisition module and control circuit module.The MCU main controller module uses EP4CE10F17C8 N FPGA chip as the main control chip,and the voltage and current acquisition module selects BQ76940 chip as the battery monitoring chip.(3)Software design of reconfigurable power battery management system.Based on the hardware module design,the modular software design of the system is carried out based on Verilog HDL language and Quartus II development environment.It mainly designs the main program of the system,battery information acquisition program,fault isolation program,balance control program and host computer to realize the programmable management of the hardware platform.(4)Test and experiment.Using the designed hardware platform,the fault tolerance experiment and the balanced control experiment of the system are carried out.The fault tolerance experiment verifies that the system has the ability of fault isolation for three common faults,i.e.,short circuit,open circuit and thermal runaway.The balanced control experiment proves that the balance control strategy can significantly improve the charge and discharge efficiency and the consistency of the battery pack.