Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Electrochemical Simulation for Limited-Discharge Current Prediction of Li-ion Secondary Cell Using High-Rate Discharge

고율 방전용 리튬 전지의 한계 방전 전류 예측을 위한 전기화학 시뮬레이션

  • Kim, Simon (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Lee, Young Shin (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.)
  • 김성종 (충남대학교 기계설계공학과) ;
  • 이영신 (충남대학교 기계설계공학과)
  • Received : 2015.02.10
  • Accepted : 2015.06.10
  • Published : 2015.08.01
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Abstract

Li-ion batteries are energy sources that are widely used in applications such as notebooks, cellular phones, power tools, and vehicles. They are devices in which stored chemical energy is changed to electrical energy by electrochemical reactions. They have a high energy density, small size, and are lightweight. In particular, power tools and vehicles require high charge/discharge rates. Therefore, in this paper, we perform electrochemical simulations using a commercial finite-element analysis program to determine the high discharge-rate characteristics of Li-ion cells. In addition, by performing high discharge-rate simulations, we found that the limited discharge current was 63 A. Based on the results obtained, we investigate the behavior of Li-ion cells with a high rate of discharge.

리튬 전지는 에너지 밀도가 높고, 소형화 및 경량화가 가능한 이차전지로서 저장된 화학 에너지를 전기화학적 반응을 통해 전기 에너지로 변환하는 장치로 노트북, 휴대폰, 파워-툴 및 자동차 등에 널리 사용되고 있는 에너지원이다. 특히, 파워-툴이나 자동차와 같은 응용분야에서는 고율 충방전을 필요로 하는데, 본 논문에서는 리튬 전지의 고율 방전 특성에 대해서 상용 유한요소 해석 프로그램을 이용하여 전기화학 시뮬레이션을 진행하여 실험 결과와 유사한 전기화학 모델을 완성하게 되었다. 또한, 이러한 전기화학적 해석 모델을 이용하여 고율 방전용 리튬 전지의 한계 방전 전류가 63A 정도라는 것을 해석적으로 예측 할 수 있었고, 이를 바탕으로 고율 방전 시 리튬 전지의 거동에 대해서 이해할 수 있게 되었다.

Keywords

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