电池模组热扩散精准建模及高效仿真研究

doi:10.19562/j.chinasae.qcgc.2024.04.011

Abstract

Abstract:

The simulation of thermal runaway propagation in battery systems is an important step in the development process of battery systems， the results of which can provide guidance and suggestions for the optimization of battery system safety design. Therefore， it is necessary to simplify the thermal runaway propagation model reasonably in order to significantly improve research and development efficiency while meeting the accuracy of the system model. Based on the traditional thermal runaway test and numerical simulation results of the cell， by adopting the research approach of "cell - module”， a simplified thermal runaway propagation model for battery modules with the normalized heat generation equation as the core is constructed in this paper to study the accuracy and computational efficiency of the model. The results show that the computational time of the simplified thermal runaway propagation model for battery modules is 37 minutes， while the computational time of the traditional module model is about 90 minutes under the same conditions. With the accuracy of the models reaching 90%， the computational time is shortened by about 2/3， significantly reducing the computational cost. The research in this paper provides technical reference for efficient and fast simulation of thermal propagation at the battery pack level.

Key words: lithium-ion battery, thermal runaway, thermal runaway propagation, thermal runaway propagation model, model simplification

Nannan Kuang,Botao Hu,Guo Li,Guanglei Zhao,Shuang Feng,Likun Xu. Study on Accurate Modeling and Efficient Simulation of Thermal Runaway Propagation of Battery Modules[J].Automotive Engineering, 2024, 46(4): 652-661.

Figures/Tables 23

References 20

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材料	A_x /s^-1	m_x /g		ΔH_x /（J·g^-1）	c_x，0
SEI膜	1.667×10¹⁵	184.59		257	0.15
负极	0.003 （T<150 ℃）	184.59		1 714	1
负极	2.5×10¹⁴ （T≥150 ℃）	184.59		1 714	1
隔膜	1.5×10⁴⁰	20.038 6		-233.2	1
电解液	3×10¹⁵	135		700	1
正极	1.75×10⁹	294.4		77	0.99
正极	1.077×10¹²	294.4		84	0.99
材料	E_a_，x /（J·mol^-1）	n	m	f（x）	T₀/℃
SEI膜	1.3508×10¹⁵	1	0	1	80
负极	2.5×10⁴	1	0	exp（-t_sei/t_sei，ref）	80
隔膜	4.2×10⁵	1	0	1	140
电解液	1.7×105	1	0	1	140
正极	1.1495×10⁵	1	1	1	150
正极	1.5888×10⁵	1	1	1	170

位置	θ₀/（K·m²·W^-1）	θ/（K·m²·W^-1）
面1	0	0.001
面2	0	0.002
面3	0	0.002
面4	0	0.002
面5	0	0.002

温度点	试验结果/℃	仿真结果/℃	误差/%
T_2end	370.71	336.84	9.1
T_3end	358.53	349.91	2.4
T_4end	352.25	362.22	2.8
T_5end	371.35	367.79	1.0

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Study on Accurate Modeling and Efficient Simulation of Thermal Runaway Propagation of Battery Modules

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