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A physically meaningful equivalent circuit network model of a lithium-ion battery accounting for local electrochemical and thermal behaviour, variable double layer capacitance and degradation

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Title: A physically meaningful equivalent circuit network model of a lithium-ion battery accounting for local electrochemical and thermal behaviour, variable double layer capacitance and degradation
Authors: Von Srbik, M-T
Marinescu, M
Martinez-Botas, RF
Offer, GJ
Item Type: Journal Article
Abstract: A novel electrical circuit analogy is proposed modelling electrochemical systems under realistic automotive operation conditions. The model is developed for a lithium ion battery and is based on a pseudo 2D electrochemical model. Although cast in the framework familiar to application engineers, the model is essentially an electrochemical battery model: all variables have a direct physical interpretation and there is direct access to all states of the cell via the model variables (concentrations, potentials) for monitoring and control systems design. This is the first Equivalent Circuit Network- type model that tracks directly the evolution of species inside the cell. It accounts for complex electrochemical phenomena that are usually omitted in online battery performance predictors such as variable double layer capacitance, the full current-overpotential relation and overpotentials due to mass transport limitations. The coupled electrochemical and thermal model accounts for capacity fade via a loss in active species and for power fade via an increase in resistive solid electrolyte passivation layers at both electrodes. The model's capability to simulate cell behaviour under dynamic events is validated against test procedures, such as standard battery testing load cycles for current rates up to 20 C, as well as realistic automotive drive cycle loads.
Issue Date: 1-Sep-2016
Date of Acceptance: 11-May-2016
URI: http://hdl.handle.net/10044/1/33682
DOI: 10.1016/j.jpowsour.2016.05.051
ISSN: 0378-7753
Publisher: Elsevier
Start Page: 171
End Page: 184
Journal / Book Title: Journal of Power Sources
Volume: 325
Issue: 1
Copyright Statement: © 2016 Elsevier. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/I00422X/1
EP/I00422X/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
Lithium-ion battery
Equivalent circuit modelling
Electrochemical phenomenological model
Thermal modelling
Degradation
Battery management system optimisation
STATE-OF-CHARGE
ELECTRIC VEHICLE
AGING MODEL
POWER
OPTIMIZATION
SIMULATIONS
PREDICTION
VOLTAGE
DESIGN
03 Chemical Sciences
09 Engineering
Energy
Publication Status: Published
Online Publication Date: 2016-06-14
Appears in Collections:Mechanical Engineering
Grantham Institute for Climate Change
Faculty of Natural Sciences
Faculty of Engineering