NDLI: State of charge determination in a lead-acid battery: combined EMF estimation and Ah-balance approach

Content Provider	IEEE Xplore Digital Library
Author	Zhu, C.B. Coleman, M. Hurley, W.G.
Copyright Year	2004
Description	Author affiliation: Power Electron. Res. Centre, Nat. Univ. of Ireland, Galway, Ireland (Zhu, C.B.; Coleman, M.; Hurley, W.G.)
Abstract	State of charge (SOC) determination is an increasingly important issue in battery technology. In addition to the immediate display of the remaining battery capacity to the user, precise knowledge of SOC exerts additional control over the charging/discharging process which in turn reduces the risk of overvoltage and gassing, which degrade the chemical composition of the electrolyte and plates. This paper describes a new approach to SOC determination for the lead-acid battery by combining Ah-balance with an EMF estimation algorithm, which predicts the battery's EMF value while it is under load. The EMF estimation algorithm is based on an equivalent-circuit representation of the battery, with the parameters determined from a pulse test performed on the battery and a curve-fitting algorithm by means of least-square regression. The whole battery cycle is classified into seven states where the SOC is estimated with the Ah-balance method and the proposed EMF based algorithm. Laboratory tests and results are described in detail in the paper.
Sponsorship	IEEE Power Electon. Soc
Starting Page	1908
Ending Page	1914
File Size	448612
Page Count	7
File Format	PDF
ISBN	0780383990
ISSN	02759306
DOI	10.1109/PESC.2004.1355409
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-20
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Batteries State estimation Testing Chemical technology Displays Voltage control Degradation Chemical processes Prediction algorithms Performance evaluation
Content Type	Text
Resource Type	Article

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