Secondary Use Applications of Plug-in EV Lithium-Ion Batteries


Second-life battery research is important because electric vehicles (EVs) are entering the car market in increasing numbers. Although the batteries used in EVs usually only have a vehicle lifetime of 8-10 years, they still have significant capacity remaining for alternative uses. Finding secondary uses for the EV batteries reduces their up-front cost and provides benefits to consumers and utilities, such as demand charge management, renewable energy integration and regulation energy management.

Working in conjunction with our partners, we have successfully studied the baseline health of four EV batteries and developed a long-term testing protocol to track battery performance over time under second-use application cycling.

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For more information on second-use batteries, please visit our project partner, the National Renewable Energy Laboratory’s webpage, Battery Second Use for Plug-In Electric Vehicles.

Project Funders:

California Energy CommissionUC Davis Plug-in Hybrid Electric Vehicle Research

Project Partners:

NRELUCSDPower AnalyticsAeroenvironment


Program at a Glance

Program Goals

To identify alternative uses of electric car batteries at the end of their useful life in automobiles

CSE's Role

Built and operated Advanced Electric Vehicle Battery Test Facility on the UC San Diego campus
Integrated test facility with campus microgrid data monitoring and generation/load resources
Developed and implemented stationary application duty cycles for test batteries
Monitored battery degradation through periodic health checks, known as Reference Performance Tests
Analyzed battery performance data and prepared detailed testing reports


Key Partners

NREL, UCSD, Power Analytics, AeroVironment

Impact Statement

Successfully tracked battery performance over time under second-use application cycling