Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Numerical Study on Thermal Runaway by Temperatures and Appearance Sizes in NCM622 and LFP Cylindrical Lithium-ion Batteries

NCM622과 LFP 리튬이온 배터리의 주변 온도와 셀 크기에 따른 열폭주 현상에 대한 수치해석적 연구

  • Kim, Woo-Young (Department of Mechanical Engineering, Jeju National University) ;
  • Kim, Nam-Jin (Department of Mechanical Engineering, Jeju National University)
  • 김우영 (제주대학교 기계공학과) ;
  • 김남진 (제주대학교 기계공학과)
  • Received : 2021.10.24
  • Accepted : 2021.11.24
  • Published : 2021.12.01
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Abstract

As accidents with thermal runaway (TR) of lithium-ion batteries occur sporadically, the safety concern is the main obstacle that hinders the large-scale applications of lithium ion batteries. In most accidents, the TR of a single cell occurred first, and then dissipated the heat to the surroundings and triggered the TR of adjacent cells, resulting in TR propagation. Therefore, it is important to understand the mechanism of TR propagation and determine the key parameters during TR propagation in a battery pack. In this study, we performed a numerical analysis on the thermal runaway phenomenon by cathode active materials and appearance sizes in cylindrical lithium-ion batteries using a two-dimensional analysis model. The model results showed that the TR propagation of 21700 type cells (21 mm diameter, 70 mm height) occurs more rapidly than 46800 type cells (46 mm diameter, 80 mm height) and the LFP cell has higher thermal safety than the NCM cell. Especially, we found that the effect of the separator on the occurrence of TR is negligible.

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References

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