Development of a Combined Battery System for Electric Vehicles with Battery Lifespan Enhancements

The authors propose a combined battery system (CBS) for low cost electric vehicles (EVs) to enhance battery life. The EVs popularly called as Neighborhood Electric Vehicle or Low-Speed-Electric-Vehicle are spreading in developing countries. Conventionally the EVs batteries consist of high energy density cells, called energy cells (EC). A major issue with the EVs is high operational costs mainly due to high battery cost and short lifespan of the ECs. In this study, the authors develop a CBS consisting of a combination of following two kinds of batteries: i) EC which is the main energy source for the EV, and ii) a battery having high power density also called as power cells (PC) which is more suitable to bear high charge-discharge currents. The key feature of the proposed system is to minimize the size of additional battery by using our high power lithium ion battery. The authors performed experiments to estimate EC life for several capacity values of the PC. The authors found that the EC life can be doubled by combining with a PC having a capacity under 1/20 of the EC. WLTP results showed that using this capacity ratio, combined battery system reduced the load on the EC, leading to lifespan enhancement by a factor of 2 for the EC.

Language

  • English

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Filing Info

  • Accession Number: 01719898
  • Record Type: Publication
  • Source Agency: SAE International
  • Report/Paper Numbers: 2018-01-0448
  • Files: TRIS, SAE
  • Created Date: Oct 8 2018 12:37PM