基于Simulink的锂离子电池建模与仿真研究

Modeling and simulation of lithium-ion batteries based on Simulink

锂离子电池因为其高比能、高输出功率、长循环寿命等优点而被广泛应用于电动汽车及储能领域,对锂离子电池进行建模有助于了解不同工况下电池的响应行为,也为后续的电池荷电状态估计、电池均衡控制等研究奠定基础。在分析常规电池模型基础上,利用Matlab/Simulink仿真软件构建了钴酸锂电池二阶Thevenin仿真模型,提出了一种电池测试工步及参数辨识方法,对不同工况进行了仿真验证与分析。分析与验证结果表明:钴酸锂电池二阶Thevenin仿真模型精确度高,能够准确模拟不同工况下电池输出特性。

Li-ion batteries are widely used in the fields of electric vehicles and energy storage because of high energy density, low self-discharge rate, long cycle life, etc. By establishing the second-order equivalent circuit model, it is helpful to know about the response behavior of the batteries under different working conditions, and to lay the foundation for the research of charge state estimation and battery equalization control. Based on the analysis of conventional battery model and modeling method, an improved battery test and a parameter identification method were proposed. The second-order Thevenin model of a lithium cobalt oxide battery was built and simulated in Matlab/Simulink under different working conditions. The error analyses show that the established model is more accurate and can reflect the actual output characteristics of the battery.