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Principles and Comparative Studies of Various Power Measurement Methods for Lithium Secondary Batteries

리튬이차전지 출력측정법의 원리 및 측정법간 비교 연구

  • Lee, Hye-Won (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Yong-Min (Department of Chemical and Biological Engineering, Hanbat National University)
  • 이혜원 (한밭대학교 화학생명공학과) ;
  • 이용민 (한밭대학교 화학생명공학과)
  • Received : 2012.06.13
  • Accepted : 2012.08.17
  • Published : 2012.08.31

Abstract

As the market of lithium secondary batteries moves from mobile IT devices to large-format electric vehicles or energy storage systems, the strengthened battery specifications such as long-term reliability longer than 10 years, pack-level safety and tough competitive price have been required. Moreover, even though high power properties should also be achieved for hybrid electric vehicles, it is not easy to measure accurate power values at various conditions. Because it is difficult to choose a proper measurement method and its experimental condition is more complex comparing to capacity measurement. In addition, the power values are very sensitive to power duration time, state-of-charge (SOC) of cells, cut-off voltages, and temperatures, whereas capacity values are not. In this paper, we introduce three kinds of power measurement methods, hybrid pulse power characterization (HPPC) suggested by US FreedomCar, so-called J-pulse by Japan electric vehicle association standards (JEVS) and constant power measurement, respectively. Moreover, with pouch-type unit cells for HEV, experimental power data are discussed in order to compare each power measurement.

Acknowledgement

Supported by : 국립 한밭대학교

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