#### 期刊菜单

Parameter Identification of Li-ion Battery Based on Parameter Estimation Toolbox
DOI: 10.12677/AEPE.2021.93014, PDF, HTML, XML, 下载: 584  浏览: 1,937

Abstract: In recent years, the research of li-ion battery is booming. The primary task of battery research is to establish a reliable battery model and identify the battery parameters accurately. Taking ternary lithium battery as the research object, the second-order RC battery model with both accuracy and simplicity is selected, and the parameter estimation toolbox of MATLAB is used to identify the pa-rameters of the battery model. Finally, the accuracy of the battery model is verified under HPPC and DST conditions, which proves that the battery parameter identification has a good effect. The identi-fication method is simple and practical, and can be widely used in battery research.

1. 引言

2. 电池模型的建立

2.1. 二阶RC等效电路模型

$\left\{\begin{array}{c}{U}_{OC}\left(t\right)=I{R}_{0}+{U}_{1}+{U}_{2}+{U}_{L}\left(t\right)\\ I=\frac{{U}_{1}}{{R}_{1}}+{C}_{1}\frac{d{U}_{1}}{dt}\\ I=\frac{{U}_{2}}{{R}_{2}}+{C}_{2}\frac{d{U}_{2}}{dt}\end{array}\right\}$ (1)

Figure 1. Second order RC equivalent circuit model

2.2. 基于Simscape搭建等效电路模型

Figure 2. Simscape model of second order RC equivalent circuit

Figure 3. Equivalent model of packaged battery

3. 电池模型参数辨识

Figure 4. Main interface of Parameter Estimation Toolbox

Figure 5. Parameter estimation process

4. 电池参数辨识结果

Figure 6. Comparison of measured voltage and simulated voltage before parameter identification

4.1. 参数辨识结果

Figure 7. Comparison of test voltage and simulation voltage

Figure 8. Changes of battery parameters

4.2. 辨识结果的验证

Figure 9. Comparison of test voltage and simulation voltage under HPPC condition

Figure 10. Comparison of test voltage and simulation voltage under DST condition

5. 总结

NOTES

*通讯作者。

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