[논문]고출력 18650 리튬이온 배터리의 발열인자 해석 및 실험적 검증

강태우; 유기수; 김종훈

doi:10.6113/tkpe.2019.24.5.365

고출력 18650 리튬이온 배터리의 발열인자 해석 및 실험적 검증
Analysis and Experiment Verification of Heat Generation Factor of High Power 18650 Lithium-ion Cell 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.24 no.5, 2019년, pp.365 - 371

강태우 (Department of Electrical Engineering, Chungnam National University) , 유기수 (Department of Electrical Engineering, Chungnam National University) , 김종훈 (Department of Mechanical Engineering, Yeungnam University)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (12)

그림 Fig. 1. Equivalent electrical circuit model of a lithium-ion cell.
그림 Fig. 2. Discharging voltages and temperatures with various C-rates. (2C, 3C, 4C)
그림 Fig. 3. Cell’s surface temperature during discharging from fully-charged state to fully-discharged state with various C-rates. (2C, 3C, 4C)
그림 Fig. 4. Cell’s surface temperature with respect to the discharging voltage during 1C-rate OCV test and enlarged figure of voltage part.
그림 Fig. 5. Cell’s surface temperature with respect to the discharging voltage during OCV test.
그림 Fig. 6. Scheme of air circulation of chamber and forced convection condition of a lithium-ion cell.
표 TABLE I RELATION BETWEEN C AND n ACCORDING TO REYNOLDS(Re)
표 TABLE II ΔT VALUES OF FIG. 4(a) AND FIG. 5(a), (b)
그림 Fig. 7. Comparison between the direct resistance and heating based resistance at variable SOC points.
표 TABLE III THERMAL PROPERTIES OF LITHIUM-ION CELL AND AIR
그림 Fig. 8. 3D plots of the simulation results of the heat generation with various C-rates during discharge.
그림 Fig. 9. Comparison between simulation and experiments of the heat generation with various C-rates.

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