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Mechanical properties and thermal runaway study of automotive lithium-ion power batteries

Mechanical properties and thermal runaway study of automotive lithium-ion power batteries As the most widely used power battery for pure electric vehicles, lithium-ion battery has been studied in detail, including electrochemical performance and mechanical safety. This paper focuses on the mechanical response and thermal runaway phenomena caused by external mechanical stress of lithium-ion batteries at different states of charge (SOC). The results show that the SOC affects the mechanical strength as well as the temperature of the battery under external stress. When stress is applied to the cell, the higher the SOC of the cell, the higher its stiffness and surface temperature. The force is determined to propagate layer by layer based on the dynamic analysis approach of stress propagation theory. The velocity is inversely proportional to the stress propagation distance. Excessive impact velocity will lead to concentration of stress in the battery, which will lead to short circuit and thermal runaway phenomenon of the battery. The findings of these phenomena are of guiding significance to the safety study of electric vehicle lithium-ion batteries. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Mechanical properties and thermal runaway study of automotive lithium-ion power batteries

Ionics , Volume 28 (1) – Jan 1, 2022

Mechanical properties and thermal runaway study of automotive lithium-ion power batteries

As the most widely used power battery for pure electric vehicles, lithium-ion battery has been studied in detail, including electrochemical performance and mechanical safety. This paper focuses on the mechanical response and thermal runaway phenomena caused by external mechanical stress of lithium-ion batteries at different states of charge (SOC). The results show that the SOC affects the mechanical strength as well as the temperature of the battery under external stress. When stress is applied to the cell, the higher the SOC of the cell, the higher its stiffness and surface temperature. The force is determined to propagate layer by layer based on the dynamic analysis approach of stress propagation theory. The velocity is inversely proportional to the stress propagation distance. Excessive impact velocity will lead to concentration of stress in the battery, which will lead to short circuit and thermal runaway phenomenon of the battery. The findings of these phenomena are of guiding significance to the safety study of electric vehicle lithium-ion batteries. Keywords Lithium-ion battery · SOC · Thermal runaway · Mechanical stress analysis Introduction for lithium-ion batteries to increase the capacity retention of lithium-ion batteries. Xia et al. [11, 12] conducted crush With the enhancement of people’s concept of environmental and impact tests at various speeds to examine the individual protection, the battery electric vehicles (BEVs) are devel- mechanical parameters of the battery for the single battery oped rapidly [1, 2]. However, due to the lack of safety and investigation. They pointed out the impact of battery pack durability of BEV, people have questioned their sustainable manufacturing and assembly on battery pack safety design development [3, 4]. After investigation, the cause of the bat- [13]. Nguyen et al. [14] recommended the usage of sacri- tery pack fire and explosion was an internal short circuit...
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References (32)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-021-04309-1
Publisher site
See Article on Publisher Site

Abstract

As the most widely used power battery for pure electric vehicles, lithium-ion battery has been studied in detail, including electrochemical performance and mechanical safety. This paper focuses on the mechanical response and thermal runaway phenomena caused by external mechanical stress of lithium-ion batteries at different states of charge (SOC). The results show that the SOC affects the mechanical strength as well as the temperature of the battery under external stress. When stress is applied to the cell, the higher the SOC of the cell, the higher its stiffness and surface temperature. The force is determined to propagate layer by layer based on the dynamic analysis approach of stress propagation theory. The velocity is inversely proportional to the stress propagation distance. Excessive impact velocity will lead to concentration of stress in the battery, which will lead to short circuit and thermal runaway phenomenon of the battery. The findings of these phenomena are of guiding significance to the safety study of electric vehicle lithium-ion batteries.

Journal

IonicsSpringer Journals

Published: Jan 1, 2022

Keywords: Lithium-ion battery; SOC; Thermal runaway; Mechanical stress analysis

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