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Off-vehicle energy store selection for high rate EV charging station

Off-vehicle energy store selection for high rate EV charging station
Off-vehicle energy store selection for high rate EV charging station
Fast Electric Vehicle (EV) charging, defined as a charging power greater than 120kW, is needed to help overcome range anxiety, the worry of an EV owner that an EV battery will run out of energy before a destination is reached. Fast charging stations require a high power grid connection, which limits the available installation locations and increases grid connection costs. A stationary off-vehicle energy store can be used at a fast charging station to buffer the power between the grid and the EV to minimise and control the grid connection power. It is shown that for a charging station in the near future, which is used infrequently, a small (-50kWh) offvehicle energy store that can accept high C-Rates (1-10C) during charge and discharge may be used. It is suggested that lithium iron phosphate batteries are used for this purpose and experiments are currently being undertaken to validate this. For a charging station further in the future, which is used more frequently, a much larger (4MWh) off-vehicle energy store with lower C-Rates (<1C) is required. It is suggested that lead-acid batteries or flow batteries are used for this purpose. If flow batteries are chosen, supercapacitors or lithium-ion batteries could be used in a hybrid system to deal with power fluctuations that occur as different numbers of EVs arrive to charge.
Electric Vehicles, Energy Storage, Fast Charging
Institution of Engineering and Technology
Bryden, Thomas, Samuel
451e1fd4-25ab-4771-9e69-0598acf6d626
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Hilton, George
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Dimitrov, Borislav
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Ponce De Leon Albarran, Carlos
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Mortimer, Alan
d88a25eb-d046-4951-9253-0d56669fdfbd
Bryden, Thomas, Samuel
451e1fd4-25ab-4771-9e69-0598acf6d626
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Hilton, George
fd332562-ee82-4b62-b99c-0d0ee2e06ca1
Dimitrov, Borislav
7a128e82-8621-4ffb-8390-77f7153d5d3a
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Mortimer, Alan
d88a25eb-d046-4951-9253-0d56669fdfbd

Bryden, Thomas, Samuel, Cruden, Andrew, Hilton, George, Dimitrov, Borislav, Ponce De Leon Albarran, Carlos and Mortimer, Alan (2016) Off-vehicle energy store selection for high rate EV charging station. In 6th Hybrid and Electric Vehicles Conference (HEVC 2016). Institution of Engineering and Technology. 9 pp . (doi:10.1049/cp.2016.0986).

Record type: Conference or Workshop Item (Paper)

Abstract

Fast Electric Vehicle (EV) charging, defined as a charging power greater than 120kW, is needed to help overcome range anxiety, the worry of an EV owner that an EV battery will run out of energy before a destination is reached. Fast charging stations require a high power grid connection, which limits the available installation locations and increases grid connection costs. A stationary off-vehicle energy store can be used at a fast charging station to buffer the power between the grid and the EV to minimise and control the grid connection power. It is shown that for a charging station in the near future, which is used infrequently, a small (-50kWh) offvehicle energy store that can accept high C-Rates (1-10C) during charge and discharge may be used. It is suggested that lithium iron phosphate batteries are used for this purpose and experiments are currently being undertaken to validate this. For a charging station further in the future, which is used more frequently, a much larger (4MWh) off-vehicle energy store with lower C-Rates (<1C) is required. It is suggested that lead-acid batteries or flow batteries are used for this purpose. If flow batteries are chosen, supercapacitors or lithium-ion batteries could be used in a hybrid system to deal with power fluctuations that occur as different numbers of EVs arrive to charge.

Text
Thomas Bryden - Off-vehicle Energy Store Selection for High Rate EV Charging Station v4 - Accepted Manuscript
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More information

Accepted/In Press date: 29 April 2016
Published date: 3 November 2016
Venue - Dates: The 6th Hybrid and Electric Vehicle conference (HEVC 2016), United Kingdom, 2016-11-02 - 2016-11-03
Keywords: Electric Vehicles, Energy Storage, Fast Charging
Organisations: Energy Technology Group, Education Hub

Identifiers

Local EPrints ID: 407067
URI: https://eprints.soton.ac.uk/id/eprint/407067
PURE UUID: 20890d3f-f778-4d36-bc7b-b379221c9913
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 29 Mar 2017 01:13
Last modified: 14 Mar 2019 01:42

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