基于概率函数触发的锂电池模组热失控蔓延建模与分析方法研究

doi:10.19562/j.chinasae.qcgc.2024.08.009

Abstract

Abstract:

For the problem that existing numerical simulation methods are unable to accurately reflect the probabilistic temperature variations caused by thermal runaway in lithium batteries， s a modeling method for the thermal runaway propagation of lithium battery modules based on probability function triggering is proposed. This method calculates the triggering probability of thermal runaway in each temperature range by statistical analysis of the temperature range and distribution of actual thermal runaway events in lithium batteries. Based on the proposed probabilistic trigger simulator， the simulation process is probabilistically triggered. The effectiveness of the method is verified by comparing simulation results with experimental data， showcasing a high degree of correlation. Then， the thermal spread paths and their probabilities under different triggering conditions of the probability function are analyzed， revealing multiple potential routes for thermal runaway， including the jump thermal runaway event. The sequential thermal runaway path is identified as the most probable， while the jump phenomenon is deemed least likely. The proposal of this method further improves the consistency between numerical simulation and actual process of thermal runaway in lithium batteries， providing an effective research tool and analysis method for studying the probability of thermal runaway propagation in lithium battery modules.

Key words: lithium battery modules, jumping thermal runaway, probability, heat spread, function trigger

Jin Yu,Chuanyu Guo,Jiajia Yu. Modeling and Analysis Method of Thermal Runaway Propagation in Lithium Battery Modules Triggered by Probability Function[J].Automotive Engineering, 2024, 46(8): 1422-1430.

Figures/Tables 11

References 24

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类型		概率触发模型		非概率模型
类型		路径	概率/%	路径
单层	三电池	1→2→3	99.655	1→2→3
	三电池	1→3→2	0.345	1→2→3
	四电池角触发	1→2→3→4	99.432	1→2→3→4
		1→2→4→3	0.505
		1→3→2→4	0.063
		1→3→4→2	0
		1→4→2→3	0
		1→4→3→2	0
	四电池中间触发	2→3→1→4	53.91	2→（1，3）→4
		2→1→3→4	43.74
		2→3→4→1	2.195
		2→1→4→3	0.15
		2→4→1→3	0.000 61
		2→4→3→1	0.004 39
双层	2 × 2	1→2→3→4、（1→3→2→4）	89.2	1→（2，3）→4
		1→2→4→3、（1→3→4→2）	9.72
		1→4→2→3、（1→4→3→2）	1.08

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Modeling and Analysis Method of Thermal Runaway Propagation in Lithium Battery Modules Triggered by Probability Function

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