UNCERTAINTY ANALYSIS IN A REAL-TIME STATE-OF-CHARGE EVALUATION SYSTEM FOR LITHIUM-ION BATTERIES

V. Pop, P.P.L. Regtien, H.J. Bergveld, P.H.L. Notten, J.H.G. Op het Veld

Abstract

Lithium-ion (Li-ion) is the most commonly used battery chemistry in portable applications nowadays. Accurate State-of-Charge (SoC) and remaining run-time (tr) calculation for portable devices is important for the user convenience and to prolong the lifetime of batteries. A new SoC algorithm for Li-ion batteries that combines adaptivity with direct measurement and book-keeping systems has been developed and implemented in a real-time evaluation system.<br />
In this paper the error sources in the real-time SoC evaluation system with possible calibration solutions are described. The goal of the SoC system is to predict the remaining run-time of a Li-ion battery with an uncertainty of 1 minute or better under all realistic user conditions, including a wide variety of load currents and a wide temperature range.

Keywords

portable energy, Li-ion batteries, error, State-of-Charge

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PWC-2006-TC4-056u.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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