Construction and simulation analysis of thermoelectric coupling model of lithium battery based on digital twin

doi:10.19799/j.cnki.2095-4239.2022.0539

Abstract

Abstract:

In the context of carbon peak and carbon neutrality, shortening the operation simulation time and improving the accuracy of simulation results are of great significance for lithium batteries in large-scale energy storage power stations to improve the CFD simulation efficiency and safety management level. Aiming to solve the problem that the existing simulation models cannot support the fast and accurate simulation of their operation states, we propose a method for constructing a thermoelectric coupling model of lithium batteries based on the digital twin. First, the digital twin structure system of lithium batteries is designed and the principle of thermoelectric coupling model construction is analyzed. Second, considering that the LTI reduced-order model of the ANSYS TwinBuilder platform has the characteristics of short calculation time and high simulation accuracy, the coupling mechanism between the thermodynamic model and the equivalent circuit model is analyzed. In addition, a lithium battery thermoelectric coupling digital twin model is established based on the ANSYS TwinBuilder. Further, the parameters of the equivalent circuit model and thermodynamic model are identified offline by the least-squares algorithm and principle analysis, respectively. Considering the influence of factors such as aging and temperature, the recursive least-squares algorithm is used to identify the parameters of the equivalent circuit model online. Finally, the lithium battery equivalent circuit model and thermodynamic model are built in Simulink and ANSYS Icepak, respectively, and coupled to the ANSYS TwinBuilder platform. Moreover, we perform simulation analysis from multiple dimensions. The results of the comparison between the simulation and experimental values demonstrate the effectiveness and accuracy of the proposed model.

Key words: lithium battery, digital twin, thermoelectric coupling, parameter identification, ANSYS TwinBuilder

CLC Number:

TM 912

Yuhao ZHOU, Luoyun XÜ, Zhongping ZHANG, Lingchong LIU, Bin NAN, Haiqi ZHAO. Construction and simulation analysis of thermoelectric coupling model of lithium battery based on digital twin[J]. Energy Storage Science and Technology, 2023, 12(2): 536-543.

Figures/Tables 12

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Table 1

Table 2

Lithium battery thermodynamic parameters"

参数名称	密度/( $k g / m 3$ )	导热系数/[ $W / (m · K)$ ]
正极材料	2840	3.9
负极材料	1617	3.3
隔膜	658	0.4
外壳	7817	14.4
正极耳	2700	240
负极耳	8933	387.6

Table 2

Fig. 5

Table 3

Fig. 6

Fig. 7

Table 4

Online identification changes of equivalent circuit model parameters"

等效电路模型参数	变化情况
$R o$	增加0.015 Ω
$R e$	增加0.001 Ω
$R d$	增加0.0015 Ω
$C e$	0
$C d$	0

Table 4

Fig. 8

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参数名称	规格
电池体系	磷酸铁锂电池
容量	2 Ah
标称电压	3.20 V
充电截止电压	3.65 V
放电截止电压	2.50 V

仿真模型	CFD仿真时间	降阶模型仿真时间
电池单体	55 s	0.012 s
电池包	3 min 17 s	49 s

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