循环老化对锂离子电池热失控气体爆炸危险性影响实验研究

doi:10.7527/S1000-6893.2023.28529

Abstract

Abstract: To ensure that the safety status of aging batteries is under control, it is important to understand the thermal hazard of aging batteries. In this work, a non-destructive method based on computed tomography (CT) combined with in-situ detection of thermal runaway gas hazard was developed to analyse the thermal runaway gas explosion limit and explosion hazard of 18650 Li-ion batteries with different aging levels. The experimental results show that, compared with the unaged battery, as the aging level increases, the internal laminar deformation of the aged battery increases and the explosion range tends to converge, reaching a maximum value when the battery undergoes 120 cycles of aging. The thermal runaway gas of the unaged battery exhibited the highest detonation temperature of 203.4°C and the highest detonation pressure of 0.4585 Mpa, and the detonation risk of the thermal runaway gas of the aged battery was significantly lower, although the detonation risk of the thermal runaway gas rebounded slightly with increasing ageing, but was still much lower than that of the unaged battery. The results demonstrate the feasibility of combining CT non-destructive testing with in-situ detection of thermal runaway gas hazard, and provide a theoretical basis for the construction of a database of the evolution mechanism of the hazard level of lithium batteries and detection and early warning.

Key words: Lithium ion battery, Thermal runaway, Nondestructive testing, Gas Explosion limit

CLC Number:

TM912
X934

References

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Experimental Research on the Effect of Cyclic Aging on the Detonation Risk of Thermal Runaway Gas Explosion in Lithium-ion Batteries

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