Capacity Design of Supercapacitor-Battery Hybrid Energy System with Repetitive Charging

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  • Hiramatsu Toshiyuki
    Department of Electrical Engineering, Graduate School of Engineering, The University of Tokyo
  • Huang Xiaoliang
    Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo
  • Kato Masaki
    Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo
  • Hori Yoichi
    Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo

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Other Title
  • 複数回間欠給電を行うキャパシタ・バッテリハイブリッド蓄電装置の容量比設計法
  • フクスウカイ カンケツ キュウデン オ オコナウ キャパシタ ・ バッテリハイブリッド チクデン ソウチ ノ ヨウリョウヒ セッケイホウ
  • Capacity Design of Supercapacitor‐Battery Hybrid Energy System with Repetitive Charging

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Battery systems, widely used as energy storage devices for electric vehicles (EVs), suffer from issues such as short lifetimes and low power density. In this paper, a hybrid energy storage system (HESS), which is a combination of a supercapacitor (SC) and a battery, that can be charged using wireless power transfer (WPT) technology, is presented. This combination can achieve the desired energy capacity and power density. Moreover, it offers an acceptable energy storage size for applications such as EVs and machines. In order to optimize the system for the energy and power requirements of a power train system, an optimal design principle for the HESS is proposed. The battery charge degree, Q, is defined and calculated to minimize the entire weight of the HESS. The optimal SC ratio can be obtained on the basis of the defined operation constraints. This optimal combination can reduce the weight of the storage system by 30% for the given operation pattern. Furthermore, under some conditions with optimized charge times, the SC can serve as the sole operated energy storage device and charge power can be increased using WPT.

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