Tuesday, 15 April 2014

Repurposing EV batteries into residential energy storage systems: Journal article

Our team looking at the possibility of reusing lithium-ion batteries from electric vehicles into stationary applications has a new publication in Energy Policy, a top-notch journal. The article considers the economic and energy consequences of repurposing and installing a battery from a GM Volt automobile into an Ontario residential home. This application extends the life of the Li-ion battery, allow for greater societal value from the use of valuable critical resources.

Much thanks, and congratulations, to the lead authors Catherine Heymans -- an undergraduate alumna with her new Bachelors degree BASc in Chemical Engineering from University of Waterloo -- and Dr. Sean B. Walker, our post-doc on the reuse of Li-ion batteries research project.

Highlights

EV Li-ion batteries can be reused in stationary energy storage systems (ESS).
A single ESS can shift 2 to 3 hours of electricity used in a house.
While energy use increases, potential economic and environmental effectiveness improve
ESS supports smart grid objectives.
Incentives like reduced fees are needed to encourage implementation of Li-ion battery ESS.

Abstract

The reuse of Li-ion EV batteries for energy storage systems (ESS) in stationary settings is a promising technology to support improved management of demand and supply of electricity. In this paper, MatLAB simulation of a residential energy profile and regulated cost structure is used to analyze the feasibility of and cost savings from repurposing an EV battery unit for peak-shifting. In situ residential energy storage can contribute to the implementation of a smart grid by supporting the reduction of demand during typical peak use periods. Use of an ESS increases household energy use but potentially improves economic effectiveness and reduces greenhouse gas emissions.  The research supports the use of financial incentives for Li-ion battery reuse in ESS, including lower energy rates and reduced auxiliary fees.

Key words: energy storage; second use; lithium-ion batteries

Reference

Heymans, C., Walker, S. B., Young, S. B., & Fowler, M. (2014). Economic Analysis of Second Use Electric Vehicle Batteries for Residential Energy Storage and Load-Levelling. Energy Policy, accepted for publication.  http://www.journals.elsevier.com/energy-policy/