基于LTC6802的电动汽车电池管理系统均衡控制及硬件设计

发布时间：2018-04-14 11:00

本文选题：电池管理系统 + 升降压式变化器　；参考：《天津理工大学》2016年硕士论文

【摘要】：在经济高速发展的今天,人们在享受着经济发展带来的好处的同时,也面临着能源逐渐枯竭的危机以及日益加重的环境污染,电动汽车以其高效节能的优势受到了越来越多的关注,必定成为未来汽车行业进步的方向。而其中,电池管理系统作为控制电动汽车各项指标的“心脏”,有着举足轻重的作用以及研究价值,均衡技术更是作为提高电池管理系统效率以及安全性的关键性技术得到了广泛的重视。本文从电池管理系统的均衡技术方面下手,作了以下研究:首先,对电动汽车进行分类概述并对国内外的发展现状和前景作了简要的探讨,对BMS主要功能进行了全面的阐述。其次,总结通用均衡拓扑结构的优点和缺点,同时在分析经济性、可行性及实用性的基础上选取Buck-Boost型结构作为基本均衡电路,确定了均衡系统基本控制变量,并仿真验证了参数可行性。针对电池组在充放电阶段以及搁置状态提出了均衡策略,并进行了仿真并初步验证了均衡策略的有效性。最后,对电池管理系统进行了模块化处理,设计了基于LTC6802的电压采集电路、电流采集电路、温度采集电路、CAN通信电路、均衡控制电路等硬件电路单元,并对各单元进行软件设计。分别对电压采集精度以及系统均衡效果进行了不同情况下的实验以及数据对比,验证了均衡策略可行性的同时,增加了系统在不同占空比情况下时的均衡速度的研究。
[Abstract]:Today, when the economy is developing at a high speed, people are enjoying the benefits brought by economic development, and at the same time, they are also facing the crisis of the gradual depletion of energy and the increasing environmental pollution.Electric vehicle is paid more and more attention for its advantages of high efficiency and energy saving, which will become the direction of future automobile industry progress.Among them, the battery management system, as the "heart" to control the various indexes of the electric vehicle, plays an important role and has the research value.As a key technology to improve the efficiency and safety of battery management system, equalization technology has been paid more and more attention.In this paper, the balance technology of battery management system is studied as follows: firstly, the classification of electric vehicle is summarized, and the development status and prospect at home and abroad are briefly discussed, and the main functions of BMS are expounded comprehensively.Secondly, the advantages and disadvantages of the general equilibrium topology are summarized. At the same time, on the basis of analyzing the economy, feasibility and practicability, the Buck-Boost structure is selected as the basic equalization circuit, and the basic control variables of the equalization system are determined.The feasibility of the parameters is verified by simulation.An equalization strategy is proposed for the battery pack in charge / discharge stage and shelved state. The simulation results show that the equalization strategy is effective.Finally, the module of the battery management system is designed, including voltage acquisition circuit, current acquisition circuit, temperature acquisition circuit, can communication circuit, equalization control circuit and other hardware circuit units based on LTC6802.And carry on the software design to each unit.Experiments and data comparisons of voltage acquisition accuracy and system equalization effect are carried out under different conditions, which verify the feasibility of the equalization strategy and increase the research on the equalization speed of the system under different duty cycle.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U469.72

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