锂离子电池组容量衰退建模与性能预测研究

发布时间：2018-04-15 17:24

本文选题：电动汽车 + 锂离子电池组　；参考：《北京理工大学》2015年硕士论文

【摘要】：电动汽车锂离子电池组的寿命是制约电动汽车发展的重要技术难题。本文以锰酸锂锂离子电池组为研究对象,主要针对电池组的容量衰退模型建立，性能预测模型建立、仿真和实验三个方面开展研究,主要研究工作包括以下几个方面: （1）通过对锰酸锂电池组不同环境温度、不同放电倍率下的充放电实验，重点研究分析了充放电倍率、温度等因素对电池模组容量衰退和性能的影响，为容量衰退模型的建立和性能仿真提供数据支撑。（2）将电池模组看成整体，通过加速寿命试验，，定量研究温度、放电倍率两个因素对电池模组容量衰退的影响，分别建立温度和放电倍率单独作用和共同作用下容量衰退模型，为基于电压不一致性演变的电池模组容量衰退建模打下基础。（3）分析不一致性产生的原因，给出电压不一致性的评价指标，分析电压不一致性的影响因素，对比分析电压相对偏差和电压相对极差对电池组容量衰退的影响，对比分析基于概率理论建立电池寿命预测模型、基于电压相对偏差的容量衰退模型和基于电压相对极差的容量衰退模型优缺点。得到对任意电池组建立基于电压不一致性演变的容量衰退模型的方法。（4）通过复合脉冲充放电实验，获得二阶电池模型的各性能参数，建立电池组性能仿真模型，并将仿真结果与实验值进行对比，分析验证模型的精确度。通过电路理论找到不同电池模组间参数估计的方法，并进行实验验证，进一步对，35Ah/750V电池模组和70Ah/900V电池模组进行性能仿真，得到不同容量衰退情况下电池模组的性能变化情况。
[Abstract]:Li-ion battery life of electric vehicle is an important technical problem restricting the development of electric vehicle.In this paper, the lithium manganese ion battery pack as the research object, mainly for the battery capacity decline model, performance prediction model establishment, simulation and experimental research, the main research work includes the following aspects:1) the effects of charge and discharge rate, temperature and other factors on the capacity decline and performance of the battery module were studied and analyzed by the experiments under different ambient temperature and different discharge rate of LiMnO _ 3 battery pack, and the effects of charge and discharge rate, temperature and other factors on the module capacity of the battery were analyzed.It provides data support for the establishment of capacity decline model and performance simulation.(2) taking the battery module as a whole, the effects of temperature and discharge rate on the capacity decline of the battery module were studied quantitatively by accelerated life test, and the model of capacity decline under the action of temperature and discharge rate was established, respectively.It lays a foundation for the modeling of battery module capacity decline based on the evolution of voltage inconsistency.3) analyzing the causes of the inconsistency, giving the evaluation index of the voltage inconsistency, analyzing the influence factors of the voltage inconsistency, comparing and analyzing the influence of the relative deviation of voltage and the relative range of voltage on the capacity decline of the battery pack.The advantages and disadvantages of battery life prediction model based on probability theory, capacity decline model based on voltage relative deviation and capacity decline model based on voltage relative range are compared and analyzed.A capacity degradation model based on voltage inconsistency evolution for any battery pack is presented.4) the performance parameters of the second-order battery model are obtained by the composite pulse charge-discharge experiment, and the simulation model of the battery pack performance is established. The simulation results are compared with the experimental values, and the accuracy of the model is analyzed and verified.The method of parameter estimation between different battery modules was found by circuit theory, and the experiment was carried out to verify the performance simulation of the battery modules of 35Ah/ 750V and 70Ah/900V batteries, and the performance changes of the modules were obtained under the condition of different capacity decline.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM912

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