Research on thermal runaway characteristics of lithium-ion batteries along with cell number changes under standard and low atmospheric pressures

doi:10.16265/j.cnki.issn1003-3033.2022.02.020

Abstract

Abstract:

In order to reveal the variation of thermal runaway fire risk characteristics of lithium-ion batteries for different cell numbers under ambient pressure of land surface and cruise altitude, thermal runaway experiments with different cell numbers were carried out at pressure of 95 kPa and 20 kPa. Heat release rate, total heat release, smoke temperature and concentrations of CO, CO₂ and hydrocarbons were measured. The results show that the peak heat release rate and total heat release grow with cell number in a power function and the index reduces along with the decease of pressure. As the increases of cell number, combustion explosion and jet flame become frequent and thermal hazards increase greatly, but peak concentrations of flammable gases are comparatively lower with no significant growth under pressure of 95 kPa. However, the hazards of potentially explosive gases increase greatly under 20 kPa, such as CO and hydrocarbons.

Key words: normal pressure environment, lower pressure environment, lithium-ion battery, cell number, thermal runaway

SUN Qiang, JIA Jingyun, WANG Haibin, LI Dan, HE Yuanhua, CHEN Xiantao. Research on thermal runaway characteristics of lithium-ion batteries along with cell number changes under standard and low atmospheric pressures[J]. China Safety Science Journal, 2022, 32(2): 145-151.

Figures/Tables 9

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