The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Analysis and Experiment Verification of Heat Generation Factor of High Power 18650 Lithium-ion Cell

고출력 18650 리튬이온 배터리의 발열인자 해석 및 실험적 검증

  • Kang, Taewoo (Department of Electrical Engineering, Chungnam National University) ;
  • Yoo, Kisoo (Department of Electrical Engineering, Chungnam National University) ;
  • Kim, Jonghoon (Department of Mechanical Engineering, Yeungnam University)
  • Received : 2019.03.12
  • Accepted : 2019.05.14
  • Published : 2019.10.20
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Abstract

This study shows the feasibility of the parameter of the 1st RC parallel equivalent circuit as a factor of the heat generation of lithium-ion cell. The internal resistance of a lithium-ion cell consists of ohmic and polarization resistances. The internal resistances at various SOCs of the lithium-ion cell are obtained via an electrical characteristic test. The internal resistance is inversely obtained through the amount of heat generated during the experiment. By comparing the resistances obtained using the two methods, the summation of ohmic and polarization resistances is identified as the heating factor of lithium-ion battery. Finally, the amounts of heat generated from the 2C, 3C, and 4C-rate discharge experiments and the COMSOL multiphysics simulation using the summation of ohmic and polarization resistances as the heating parameter are compared. The comparison shows the feasibility of the electrical parameters of the 1st RC parallel equivalent circuit as the heating factor.

Keywords

Acknowledgement

Supported by : 충남대학교

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