Kalman-variant estimators for state of charge in lithium-sulfur batteries

Karsten Propp, Daniel J. Auger, Abbas Fotouhi, Stefano Longo, Vaclav Knap

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

29 Citationer (Scopus)
144 Downloads (Pure)

Abstrakt

Lithium-sulfur batteries are now commercially available, offering high specific energy density, low production costs and high safety. However, there is no commercially-available battery management system for them, and there are no published methods for determining state of charge in situ. This paper describes a study to address this gap. The properties and behaviours of lithium-sulfur are briefly introduced, and the applicability of ‘standard’ lithium-ion state-of-charge estimation methods is explored. Open-circuit voltage methods and ‘Coulomb counting’ are found to have a poor fit for lithium-sulfur, and model-based methods, particularly recursive Bayesian filters, are identified as showing strong promise. Three recursive Bayesian filters are implemented: an extended Kalman filter (EKF), an unscented Kalman filter (UKF) and a particle filter (PF). These estimators are tested through practical experimentation, considering both a pulse-discharge test and a test based on the New European Driving Cycle (NEDC). Experimentation is carried out at a constant temperature, mirroring the environment expected in the authors' target automotive application. It is shown that the estimators, which are based on a relatively simple equivalent-circuit–network model, can deliver useful results. If the three estimators implemented, the unscented Kalman filter gives the most robust and accurate performance, with an acceptable computational effort.
OriginalsprogEngelsk
TidsskriftJournal of Power Sources
Vol/bind343
Sider (fra-til)254-267
Antal sider14
ISSN0378-7753
DOI
StatusUdgivet - mar. 2017

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