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Energies 2014, 7(9), 5675-5700; doi:10.3390/en7095675
Article

An Acausal Li-Ion Battery Pack Model for Automotive Applications

1,* , 2
, 3
, 3
 and 1
1 WMG, International Digital Laboratory, the University of Warwick, Coventry CV4 7AL, UK 2 Claytex Services Ltd., Edmund House, Rugby Road, Leamington Spa CV32 6EL, UK 3 Hybrids & Electrification, Jaguar & Land Rover, Banbury Road, Warwick CV35 0XJ, UK
* Author to whom correspondence should be addressed.
Received: 24 July 2014 / Revised: 13 August 2014 / Accepted: 19 August 2014 / Published: 28 August 2014
(This article belongs to the Special Issue Electrochemical Energy Storage—Battery and Capacitor)
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Abstract

In this work, a novel acausal and reconfigurable battery pack model is presented. The model structure adopted for the battery cell is based on an equivalent circuit representation. The circuit elements are modified to take account of both hysteresis and diffusion limitation. The latter is known to be a nonlinear function of large operating currents or long operating times. It is shown that the integration of a current dependent time constant within the cell model better emulates the solid diffusional dynamics of lithium intercalation into the active material under large electrical loads. The advantages of an acausal modeling approach, when scaling-up individual cell models into a complete battery system are also presented. Particular consideration is given to emulating the impact of cell to cell variations on pack performance. Using statistical analysis of battery tests, cell model parameter variations are characterized and quantified. The cell and scaled-up pack model are parameterized for a number of commercially available cell formats, energy capacities and chemistries. The new models are validated using transient, real-world, electrical data measured from an electric vehicle (EV) operating within an urban environment.
Keywords: lithium ion; battery modeling; electric vehicle (EV); battery management system; battery pack lithium ion; battery modeling; electric vehicle (EV); battery management system; battery pack
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Uddin, K.; Picarelli, A.; Lyness, C.; Taylor, N.; Marco, J. An Acausal Li-Ion Battery Pack Model for Automotive Applications. Energies 2014, 7, 5675-5700.

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