Battery Management Systems Accurate State-of-Charge by Valer Pop, Henk Jan Bergveld, Dmitry Danilov, Paul P. L.

By Valer Pop, Henk Jan Bergveld, Dmitry Danilov, Paul P. L. Regtien, Peter H. L. Notten

This e-book describes the sphere of State-of-Charge (SoC) indication for rechargeable batteries. an summary of the state of the art of SoC indication equipment together with on hand marketplace suggestions from best semiconductor businesses is equipped. All disciplines are coated, from electric, chemical, mathematical and dimension engineering to figuring out battery habit. This e-book will for that reason is for people in engineering and thinking about battery administration.

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Two artificial neural networks are used to model the system’s implementation, more precisely, to adapt the prediction of the current discharge curve to the general behaviour of the employed battery pack. A mean error of about 3% has been found using this implementation method. In 1999 Salkind et al. developed a method for SoC and SoH prediction based on fuzzy logic modelling for two battery systems – lithium– sulphur dioxide (Li-SO2) and NiMH [41]. The method involves the use of fuzzy logic mathematics to analyse data obtained by impedance spectroscopy and/or Coulomb counting techniques.

The cell consists of five regions (from left to right in Fig. 2): a negativeelectrode current collector made of copper, a porous composite negative insertion electrode, a porous separator, a porous composite positive insertion electrode and a positive-electrode current collector made of aluminium. The composite electrodes are made of active material particles held together by a binder and a suitable filler material such as carbon black. When discharge is about to begin the negative electrode is fully lithiated and the positive electrode is ready to accept lithium ions.

The EMF-versus-SoC curve remains the same even when the battery ages and the temperature dependence of this curve is relatively low [1], [44]. The EMF method can also be used to calibrate the SoC system because the same SoC has been found for a certain measured EMF, irrespective of the battery’s age and temperature. g. measurement inaccuracy in the current and the integration in time of this inaccuracy [1]. A complete description of this algorithm, which is also the starting point of this book, will be given in the next chapter.

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