动力锂离子电池均衡系统设计与研究

发布时间：2018-04-25 05:04

  本文选题：动力锂离子电池 + 电池管理系统　； 参考：《湖南大学》2016年硕士论文

【摘要】：在纯电动汽车中,电池单体以串并联的方式集成在电池包内部,由于制造过程中存在差异,电池组在使用的时候会产生相互间不一致的现象。这种不一致会影响电池寿命与续航里程。为了解决这个问题,除了提高电池制造水平以外,设计合理的电池均衡系统是提高电池包性能的主要方法。本文依托于湖南省科技厅重点项目：智能高效动力电池管理系统关健技术研究,研究了动力锂离子电池均衡系统。主要的研究工作如下：(1)通过对目标单体电池进行反复充放电实验,求取电池的充放电特性曲线。在此基础上,分别在不同环境温度下进行充放电实验,分析温度对电池工作性能的影响。(2)以6块电池为一个模块,分析电池组不一致性产生的主要机理,分别设计了电池模块内部与模块之间的均衡拓扑电路。并对所设计电路均衡原理进行简要说明。(3)依据主控芯片的引脚与功能特性分别设计了电源电路、SPI通信电路、隔离电路、充放电保护电路、均衡控制电路及其他小型电路。(4)将所设计的硬件电路按模块分类,针对各个模块将要实现的基本功能,编写相应的控制程序。主要包括主程序、数据采集程序、均衡控制算程序及通信程序等。(5)建立电池模型,在Simulink/Simpowersystem系统中搭建能量转移模型及模块内均衡模型,对均衡拓扑结构进行仿真。将所设计的PCB原理图制作成印制电路板,烧写并调试程序,对控制板进行实验验证。结果表明,所设计的均衡系统能够实现电池能量均衡,对电池组一致性有改善。
[Abstract]:In the pure electric vehicle, the battery unit is integrated in the battery package in series-parallel mode. Because of the difference in the manufacturing process, the battery pack will produce inconsistent phenomenon when it is used. This inconsistency affects battery life and range. In order to solve this problem, in addition to improving the battery manufacturing level, the design of a reasonable battery equalization system is the main method to improve the battery pack performance. Based on the key project of Hunan Provincial Science and Technology Department: the key technology of intelligent and efficient power battery management system, the power lithium ion battery equalization system is studied in this paper. The main research work is as follows: (1) the charge-discharge characteristic curve of the battery is obtained by repeated charge and discharge experiments on the target cell. On this basis, charge-discharge experiments were carried out at different ambient temperatures, and the effect of temperature on the performance of the battery was analyzed. The balanced topology circuit between the battery module and the battery module is designed. According to the pin and function characteristics of the main control chip, the SPI communication circuit, the isolation circuit and the charge-discharge protection circuit are designed, respectively. Equalization control circuit and other small circuits. 4) the designed hardware circuits are classified into modules, and the corresponding control programs are compiled according to the basic functions to be realized by each module. It mainly includes main program, data acquisition program, equalization control program and communication program, etc.) build battery model, build energy transfer model and internal equilibrium model in Simulink/Simpowersystem system, and simulate the equilibrium topology. The designed PCB schematic is made into a printed circuit board, and the program is burned and debugged, and the control board is verified experimentally. The results show that the designed equalization system can realize the energy balance of the battery and improve the battery pack consistency.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U469.72
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本文编号：1799860