Power Battery Module, Signal Acquisition And Fast Charging Strategy Research

In recent years, with the increase in demand for cars, car ownership in China hasdrastically increased. The pollution made by traditional fuel motor vehicles has becomean important source of urban pollution in China. Under the dual pressure ofinternational oil prices and environmental protection, the development of new energyvehicles has been promoted greatly around the world. Electric vehicles (EVs), as a kindof new energy vehicles, for its energy saving, environmental protection and otheramazing features, has become a pillar of strength to lead the new energy vehicles. Asthe core of electric vehicles, the safety, reliability and life cycle of the battery directlydetermines the performance and cost of the whole electric vehicle. The batterymanagement system (BMS) monitors and controls the battery module and each singlecell in the battery pack real-timely, protecting the battery module and promising of goodrunning of the electric vehicle. Therefore, the electric vehicle battery managementsystem is of very important significance.In order to achieve monitoring and controlling of the battery modules thatembedded in electric vehicles, real-time and precision acquisition of the parameters,including battery voltage, temperature and current, is not only the primary task of theelectric vehicle battery management system, but also the basis and prerequisite of otherfunctions that a BMS should have, like state of charge (SOC) and state of health (SOH)etc. Therefore, this paper firstly studies how to achieve sampling parameters of thewhole battery pack and each single cell in the module. Meanwhile, for electric vehicles,charging is like fuel motor vehicles requiring refueling. However, the traditionalcharging method needs several hours to complete the zero-to-full charge process. Itcannot meet people`s requirement of charging process is as easy and convenient asrefueling. Therefore, the fast charging method for electric vehicle battery was discussedafterwards, at last, the fast charging method for electric vehicle battery was studied byexperiments.This paper, on the basis of introduces the background of the research topic,analyzed the working principle of the electric vehicle. According to the characteristics of electric vehicles batteries, the overall design of battery module management systemwas proposed. Designed by modular hierarchical method, the management system forelectric vehicle battery was constructed based on ATMEGA16microcontroller,achieving the goal of timely and precision sampling the parameters of each battery inthe battery pack. The system’s hardware and software design was studied in Chapter IIIand IV respectively. Fast charge method and failure model together with handling wayfor EV batteries was learned in chapter V. And an approach based on parameters onlineself-learning was proposed to handle battery failures.