Vehicle-to-grid charging stations can improve battery life

Vehicle-to-grid charging points can improve the battery life of electric vehicles and reduce carbon emissions and charging costs, a government-funded project has found, writes the University of Nottingham in a Press release.

Research from the EV-elocity project, involving academics from the university’s Faculty of Engineering, shows that by careful charging and discharging, EV battery degradation can reduce by an eighth and, in some situations, up to 450 kg of carbon dioxide emitted (CO2) or £400 could be saved per vehicle each year.

Vehicle-to-grid (V2G) can balance timing and cycle aging (both of which affect battery degradation rate) to optimize battery health and improve battery health from 8.6 to 12.3 % over one year of operation, compared to conventional charging alone – equivalent to one additional year of use.

In terms of costs, V2G tariff optimization can save around £100 per year per charging station on normal business electricity tariffs, with up to £400 saved on a smarter tariff.

Environmental benefits

If managed to maximize environmental benefits, nearly half a ton of CO annually2 emissions can be reduced and significant savings (over 180 kg) can be achieved even when cost reduction is the main objective.

“A key challenge for an optimal application of V2G technology is to synchronize the needs and requirements of users and energy and transport systems,” said Professor Lucelia Rodrigues, Professor of Sustainable and Resilient Cities.

Chris Rimmer, Head of Infrastructure Strategy at Cenex and Senior Project Manager, said: “Our findings show that there is no need to compromise on financial, environmental and asset life when designing charging electric vehicles. Cost, carbon and packaging benefits can all be achieved when V2G is used intelligently with fleet vehicles. »

Professor Rodrigues added: “Our work has correlated variables such as user needs, mobility patterns and renewable electricity production to evolve different possible scenarios for the application of V2G chargers, with a view to maximizing the local renewable energy consumption, reducing costs for the user, improving battery life and reducing carbon emissions from the entire system.

Extend battery life

“Our experimental research has highlighted the potential to extend battery life by exploiting the unique ability of V2G chargers to charge and discharge the vehicle battery,” commented Professor James Marco of the Warwick Manufacturing Group. “By carefully optimizing this process and understanding how battery performance can degrade over time, it is possible to condition the battery to extend its life in a number of situations compared to conventional vehicle charging methods. .”

The EV-elocity project was funded by Innovate UK, the Department for Business, Energy and Industrial Strategy and the Office for Zero Emission Vehicles between September 2018 and January 2022; it was led by Cenex and included CrowdCharge, Leeds City Council, Nottingham City Council, University of Nottingham and University of Warwick in a second phase from January 2020.