Electric Vehicle Battery Durability and Reliability under Electric Utility Grid Operations

Battery degradation is extremely important to EV technologies and is a function of several factors, such as electrode chemistries, operating temperatures, and usage profiles (i.e. vehicle-only vs. vehicle-to-grid applications). The goal of this research is to assess such impacts. Laboratory testing of commercial "18650" Li-ion cells was conducted in Hawaii Natural Energy Institute’s Battery Testing laboratory. The battery test plan used two separate experiments: a cycling experiment to assess the impact of both V2G and G2V strategies and a calendar aging experiment to assess the impact of temperature and SOC. The results to date have shown an undeniable impact of V2G, temperature and SOC on the battery capacity loss and indicate that V2G strategies seem to double the capacity loss when performed twice daily. And, if continued at the current pace, the batteries should only last only 36 months before losing 20% of their capacity compared to at least 72 months for cells not participating in V2G. This result is yet to be confirmed by further testing and by modeling.


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  • Status: Active
  • Contract Numbers:


  • Sponsor Organizations:

    Research and Innovative Technology Administration

    University Transportation Centers Program
    1200 New Jersey Avenue
    Washington, DC  United States  20590
  • Project Managers:

    Block, David

  • Performing Organizations:

    University of Hawaii, Manoa

    2540 Dole Street
    Honolulu, HI  United States  96822
  • Principal Investigators:

    Dubarry, Mathieu

  • Start Date: 20131001
  • Expected Completion Date: 0
  • Actual Completion Date: 20180930
  • Source Data: RiP Project 36183

Subject/Index Terms

Filing Info

  • Accession Number: 01562882
  • Record Type: Research project
  • Source Agency: Electric Vehicle Transportation Center
  • Contract Numbers: DTRT13-G-UTC51
  • Files: UTC, RiP
  • Created Date: May 13 2015 1:00AM