Enhanced Equivalent Electrical Circuit Model of Lithium-Based Batteries Accounting for Charge Redistribution, State-of-Health, and Temperature Effects

Bahramipanah, Maryam (EPFL, Lausanne, Switzerland) ; Torregrossa, Dimitri (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland) ; Cherkaoui, Rachid (EPFL, Lausanne, Switzerland) ; Paolone, Mario (EPFL, Lausanne, Switzerland)

Accurate models capable to predict the dynamic behavior, and the state of charge of battery energy storage systems (BESSs) is a key aspect for the definition of model-based controls in electric vehicles and in power grid applications of these energy storage systems. In this context, this paper presents an enhanced electrical BESS model capable to accurately represent the effects of charge redistribution in lithium-based cells. In fact, this phenomenon is the main source of nonlinearity in the behavior of such devices. The improvement of the proposed model is achieved by a virtual dc current generator accounting for the internal charge transfer. The behavior of this virtual generator is inferred from experimental results describing the effects of the charge redistribution during different subphases, namely, charge, discharge, and rest phases. The proposed model, along with its parameter assessment, has been experimentally validated for: 1) two types of Li-ion chemistry; 2) aged cells; 3) different cell operating temperatures ranging from -20 °C up to 55 °C; and 4) a complex battery cell pack of 25-kWh rated energy.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
Energy - Institut de recherche appliquée en systèmes énergétiques
Date:
2017-08
Pagination:
11 p.
Published in:
IEEE Transactions on Transportation Electrification
Numeration (vol. no.):
2017, vol. 3, no. 3, pp. 589-599
DOI:
ISSN:
2332-7782
Appears in Collection:

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 Record created 2021-05-11, last modified 2021-05-28

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