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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.
Open AccessArticle

Iterative capacity estimation of LiFePO4 cell over the lifecycle based on SoC estimation correction

1
IK4-CIDETEC, Pº Miramón 196, 20009 Donostia-San Sebastián
2
CEGASA, Artapadura 11, 01013 Vitoria-Gasteiz
3
Mondragon Unibertsitatea, Loramendi 4, 20500 Arrasate-Mondragón
*
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2013, 6(3), 752-761; https://doi.org/10.3390/wevj6030752
Published: 27 September 2013
PDF [485 KB, uploaded 18 May 2018]

Abstract

Real time state of charge (SoC) and state of health (SoH) monitoring plays an essential role in electric vehicles, hybrid electric vehicles and generally in battery powered applications. Between these two state estimations, only the SoC has been studied rigorously until the current dates, while SoH or capacity estimation are much less referenced on the literature. Additionally, the SoC and the SoH estimation are strongly correlated by widely used coulomb counting equation and consequently wrong capacity estimation would lead to a SoC estimation error, which in turn, will lead to a further capacity estimation error. In this sense, the first job was to develop the equivalent electric model, design SoC estimator and to verify both of them experimentally. Then, different alternative techniques for estimating the capacity are analyzed, selecting the best choice considering the observability degree of the object of estimation: capacity. Then, in this paper we propose a new method for estimating the capacity, called iterative transferred charge, which adapts the current capacity estimation value based on the SoC correction made by the corresponding estimator. Finally, the developed algorithm is evaluated by comparing the capacity estimation with the reference over the life of the cell, by extensive experimental tests.
Keywords: capacity; estimation; life; Li-ion; observability capacity; estimation; life; Li-ion; observability
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 (CC BY 4.0).
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Macicior, H.; Oyarbide, M.; Miguel, O.; Cantero, I.; Canales, J.; Etxeberria, A. Iterative capacity estimation of LiFePO4 cell over the lifecycle based on SoC estimation correction. World Electr. Veh. J. 2013, 6, 752-761.

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