Research On Battery Management System Of Electric Vehicle

With the enhancement of global environmental considerations and the prominence of energy problems, electric vehicle have become one of the most important trends for energy-saving green vehicles, and developed quickly in 20th century. The power supply—power battery of electric vehicle is the choke point of development of electric vehicle at present. The research of battery technology and battery management system is the key to solve this problem, which is paid more attention.This paper used the testing platform——electric vehicle of dual wheel driving basedon refitted lark car, taken Valve Regulated Lead Batteries as the research subject. The aim is to lengthen the service life of the batteries, to advance the energy efficiency of the batteries and operational reliability.Battery state of charge (SOC) can be accuretly estimated by using Ampere-Hour method and Kalman Filter method. The methods were verified by using MATLAB / Simulink simulation. When Battery Management System sampled the data, BMS design scheme of dispersal acquisition and centralized processing was adopted, which is used to collect essential information of every battery for BMS control chip. Thereby, the information on battery state of charge and battery operating state were acquainted. At the aspect of hardware design, design of ECU control unit system, acquisition circuit and short-circuit protection dcircuit were introduced in detail. Used XC166 integrated development environment Tasking and Simulink Real Workshop, realized the codes of hardware emulation and the software debugging, which advanced development efficiency and guaranteed reliability of Battery Management System.Finally, combinated the batteries with Battery Management System tested and debugged in the testing platform. Experimental results indicated that designed BMS system could realize analog singa acquisition, calculation of residual capacity and estimation of SOC, and so on.