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

The Korean Institute of Power Electronics (전력전자학회)
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Inner Temperature Distribution by Two Appearances of Series-Cell Configured Battery Pack using Cylindrical Cells

원통형셀 기반 직렬배터리팩의 외형(정사/직사면체) 차이에 의한 내부 열분포 기초해석

  • Han, Dong-Ho (Electrical Engineering, Chungnam National University) ;
  • Lee, Pyeng-Yeon (Electrical Engineering, Chungnam National University) ;
  • Park, Jin-Hyeng (Electrical Engineering, Chungnam National University) ;
  • Kim, Jonghoon (Dept. Electrical Engineering, Chungnam National University) ;
  • Yoo, Kisoo (Mechanical Engineering, Yeungnam University) ;
  • Cho, In-Ho (Propulsion System Research Team, Korea Railroad Research Institute)
  • Received : 2018.02.10
  • Accepted : 2018.08.13
  • Published : 2018.12.20
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Abstract

Given that lithium-ion batteries are expected to be used as power sources for electric and hybrid vehicles, thermodynamics experimentation and prediction based on experimental data were performed. Thermal, electrochemical, and electrochemical/electrical-thermal models were used for accurate battery modeling. Various applications of different battery packs were demonstrated, and thermal analysis was performed using the same experimental conditions for square and rectangular battery packs. Accurate thermal analysis for a single cell should be prioritized to determine the thermal behavior of the battery pack. The energy balance equation, which contains heat generation and heat transfer factors, defines the thermal behavior of the battery pack. By comparing battery packs of different shapes tested under the same condition, this study revealed that the rectangular battery pack is superior to the square battery pack in terms of the maximum temperature of inner cells and temperature variation between cells.

Keywords

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Fig. 1. Equivalent circuit model of lithium-ion battery.

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Fig. 2. Resistance of lithium-ion battery.

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Fig. 3. Principle of heat generation[5] .

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Fig. 4. Principle of heat transfer[9].

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Fig. 5. Geometry of serial battery packs.

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Fig. 6. Boundary condition used in simulation.

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Fig. 7. Flowchart of heat analysis.

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Fig. 8. Current profile used in simulation and soc of cathode and anode.

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Fig. 9. The average voltage in different shape of battery pack.

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Fig. 10. Internal thermal analysis of serial battery pack.

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Fig. 11. Cylindrical cell temperature comparison inside a serial battery pack.

TABLE I INFORMATION ON A SINGLE CELL USED IN A COMSOL

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TABLE II REACTION CONSTANT USED IN COMSOL

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TABLE III INFORMATION OF EXPERIMENTAL CONDITIONUSED IN A COMSOL

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