电动车锂电池组均衡拓扑结构及能量损耗研究

发布时间：2018-01-14 20:17

本文关键词：电动车锂电池组均衡拓扑结构及能量损耗研究　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：锂电池均衡是电动汽车应用中的重要技术。由于电池不一致性的存在,对于成组后的电池组在容量利用、循环使用次数等方面远不及单体电池的问题,对电池组进行均衡控制是一种有效的解决方法。目前均衡电路与均衡控制策略逐渐成为行业的研究热点,本文也将对此展开相关研究。首先介绍了锂离子电池的基本性能参数以及对电池的基本性能做了简要的实验分析。接着介绍了常用的几种锂电池模型,并对本文所选用的常用等效电路模型做了深入分析。对电池不一致性的原理、表现形式、影响方面及解决途径做了简要分析。接着在分布式与集中式均衡的基础上设计出了一种可以提高均衡效率的混合拓扑结构,对该电路的优缺点及可行性进行分析,详细解析了均衡电路的实际均衡过程。并将之与两类典型的均衡拓扑结构进行对比,突出了优点及实用性。然后改进了以端电压为均衡判据的控制模式,并对均衡过程中的能量损耗进行分析,以组问组内均衡顺序为切入点,引入深度优先搜索算法,提出了基于能量最优转移的均衡控制策略。最后通过实验对所设计的均衡电路及控制策略进行检验,主要对均衡效率与均衡过程中的能量损耗进行评估。实验证明所设计的均衡电路与控制策略具有可行性,与目前的均衡电路相比均衡效率得以提高,并且降低了均衡过程中的能量损耗,提升能量利用率。
[Abstract]:Lithium battery equalization is an important technology for electric vehicle applications. Due to the inconsistency of the battery, the battery for a group in terms of capacity utilization, recycling times than the single battery, the balance of the battery pack is an effective solution. The equalization circuit and balance control the strategy has gradually become a hot research field, this paper will also launched related research. Firstly introduces the basic performance parameters of lithium ion batteries and the basic performance of the battery are briefly introduced. Then the experimental analysis of several commonly used commonly used lithium battery model, equivalent circuit model and selected in this paper do in-depth analysis. The battery is not consistent principle, forms, effects and solutions are briefly analyzed. Then based on the distributed and centralized balanced design of a can Hybrid topology of Gao Junheng efficiency, analyze the advantages and feasibility of the circuit, a detailed analysis of the actual equilibrium process of the equalization circuit. As compared with the balanced topology of two typical, highlighting the advantages and practicability. Then improved to the voltage control mode and the equilibrium criterion. The energy loss of balance in the process of analysis, the group asked Group balanced order as the starting point, the depth first search algorithm, the method of balanced control strategy based on optimal energy transfer. Finally, the experiment was conducted to test the balanced circuit and control strategy design, mainly to evaluate the energy loss balance of efficiency and balance process the equalization circuit and control strategy. Experiments prove that the design is feasible, compared with the current equalization equalization circuit to improve the efficiency and reduce the equilibrium in the process of Energy loss, increase the utilization of energy.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U469.72

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