基于Thevenin等效电路模型的锂离子电池组SOC估算研究-车辆工程专业论文.docxVIP

基于 Thevenin 等效电路模型的锂离子电池组 SOC 估算研究 摘 要 近年，全球的汽车数量急剧攀升，对能源的需求也越来越大，同 时对环境造成的污染也愈发严重。新能源汽车，尤其是电动汽车已成 为未来汽车的发展方向，越来越受到人们的推崇，但仍受储能电池及 其应用技术的制约。如何延长电池的使用寿命、提高电池的能量效率 及可靠性，是电动汽车产业化必须解决的问题，因此研究电池管理技 术具有十分重大的意义。 电池模型可用于整车性能的仿真研究，亦可用于电池及电池管理 系统的设计，有助于电池管理策略的仿真及验证。在研究国内外的各 种电池模型的基础上，本文基于试验结果，用参数辨识思想，建立了 锂离子电池模型。 SOC 估算一直是研究的热点，但精度一直不高。本文利用基于电 池的特性试验数据建立的电池模型，采用以安时积分为主，辅助以负 载电压法及迭代修正算法来实现 SOC 的计算及修正。 本文首先介绍了锂离子电池的电化学特性，以帮助理解电池特性； 接着设计了一系列锂离子电池特性实验，并有针对性的分析实验结果； 介绍了本文的电池采集系统的硬件及软件结构设计；然后选用试验数 据，运用参数辨识思想，对锂离子电池进行建模，并提出本文的 SOC 估计及基于电池模型的修正算法。 关键词：锂离子电池、电池模型辨识、SOC 估算 I STUDY ON SOC ESTIMATION OF LITHIUM-ION BATTERY MODULE BASED ON THEVENIN EQUIVALENT CIRCUIT MODEL ABSTRACT In recent years, the quantity of global vehicles increases sharply, and the demand for energy is larger and larger. In addition, vehicle industry brings serious pollution.Therefore people begin to pay attention to the new energy vehicle, especially electric vehicles. However, there are lots of technology restrictions such as the performance of storage battery. Prolonging the battery life and improve battery energy efficiency as well as reliability become an important issue of the industrialization of electric vehicles. Thus, it makes great significance to study battery management technology. Battery model can be used in the simulation of vehicle performance, battery and battery management system (BMS). In addition, battery model can help to simulate and validate the stratage of battery management. Based on the research of battery model home and abroad, this paper took lots of battery performance test at, and introduced Lithium-ion battery model with the Parameter Estimation tool in Matlab/Simulink. Research of SOC estimation has been very hot, but the accuracy has not been satisfying. This paper will choose Coulomb counting as the main method to calculate SOC, and will choose load-voltage method and iterative correction algorithm to achieve SOC correnction. Firstly in oreder to help to understand the battery pe