【作者】 王华；

【导师】 陈文芗；

【作者基本信息】 厦门大学 ， 仪器仪表工程， 2014， 硕士

【摘要】 当今社会,节能和环保将成为我们社会工业发展的主题,电动汽车节能和环保的特性无疑将成为未来汽车发展的方向。电动汽车的能源动力来自于动力锂离子电池组,其整体性能和使用寿命是关系动力汽车发展的关键因素。而如何高效为锂离子电池组充电、保持其一致性、提高电池组使用效率和使用寿命具有重要意义。首先,本文对国内外动力汽车电池管理系统进行了简略介绍,同时,分析了本论文中所涉及的动力锂电池充电方法进行了详细比较分析,在此基础上,提出了切实可行的变倍率充电均衡解决方案,该方案充电,以主充电电流为核心,增加了辅助充电电流,根据电池管理系统反馈的单体电池状态,选择不同的充电倍率,以实现锂电池均衡充电的目的。变倍率均衡充电系统中主要分以下几个模块：均衡控制模块、电池状态信息检测模块、主充电电源、均衡模块、人机界面等。对于主充电电源,文章采用全桥变换器实现；均衡模块中,文章对单端反激式变换器的拓扑结构进行了深入分析,较好地解决了变倍率方案下各类参数的设计与计算；在电池管理模块中,为了对锂电池的实时状态进行准确采集,提出了：串联电池电压分时接入检测法,对于解决锂电池中共模信号大的难题具有重要意义。做了大量理论分析计算的基础上,我们制作了实验平台,对某公司所生产的40Ah动力锂离子电池进行变倍率充电,在此平台的多次实验过程中表明,对多串锂电池组分别进行了采用变倍率均衡充电与不采用的对比分析,实验结果均表明,变倍率充电方法对于实现不同荷电状态下各个单体电池的充电切实有效可行。更多还原

【Abstract】 In the future, energy-saving and environmental protection will be the theme of our society’s industrial development, Energy-saving and environmental protection features of electric vehicles will no doubt be the direction of future automotive development. The electric vehicle power’senergy and power comes from lithium-ion batteries, its overall performance and service life are the key factors restricting the rapid development of electric vehicles. Therefore, how to charge the lithium-ion batteries efficient, keep its consistency improve efficiency and service life of the batteries has an important significance.Firstly in this paper, the development and applications of domestic and foreign electric vehicle battery management system are introduced, at the same time,the power lithium batteries charge and discharge involved characteristics were analyzed,For the specific charge and discharge characteristics of lithium batteries,the variable-rate charge-balancing solution was proposed, the program in the main charge on the basis of electric current,the auxiliary charging current is introduced, depending on the state of charge of each single cell using a different charging rate charge,and achieve the balanced charging purpose.This paper systematically introduces the variable rate equalization charging system’s the balanced control module, battery status information detection module, the main charging power, the balanced modules, HMI and other key module’s hardware design and the corresponding software design. The main module charging using full bridge converters topology, equalization charging using single flyback converter topology, they has undertaken an in-depth analysis. We also complete the parameters determination and calculation. In order to solve the battery information collection, proposes a series battery voltage measurement method of time sharing access, this method solve the common-mode signal problems of the in-line battery voltage detection. On the basis of a lot of theoretical work, test prototype was produced, and built a equalization charging system experimental platform of40Ah lithium-ion battery.On the platform, many cells took the experiment on the variable rate equalization charging and without the equalization charging for many times. Experimental results also show that variable rate equalization charging can effectively solve the equalization charging problem of different state of charge single cells in a series.更多还原