Battery Management Systems: Accurate State-of-Charge Indication for Battery-Powered
Applications describes the field of State-of-Charge (SoC) indication for rechargeable
batteries. With the emergence of battery-powered devices accurately estimating the battery SoC
and even more important the remaining time of use becomes more and more important. An overview
of the state-of-the-art of SoC indication methods including available market solutions from
leading semiconductor companies e.g. Texas Instruments Microchip Maxim is given in the
first part of this book. Furthermore a universal SoC indication system that enables 1% or
better accuracy under all realistic user conditions is developed. A possible integration with a
newly developed ultra-fast recharging algorithm is also described. The contents of this book
builds further on the contents of the first volume in the Philips Research Book Series Battery
Management Systems - Design by Modelling. Since the subject of battery SoC indication requires
a number of disciplines this book covers all important disciplines starting from
(electro)chemistry to understand battery behaviour via mathematics to enable modelling of the
observed battery behaviour and measurement science to enable accurate measurement of battery
variables and assessment of the overall accuracy to electrical engineering to enable an
efficient implementation of the developed SoC indication system. It will therefore serve as an
important source of information for any person working in engineering and involved in battery
management. TOC:1: Introduction. 2: State-of-the-Art of battery State-of-Charge determination.
3: A State-of-Charge indication algorithm. 4: Methods for measuring and modelling the battery's
Electro-Motive Force. 5: Methods for measuring and modelling the battery's overpotential. 6:
Battery aging process. 7: Measurement results obtained with new SoC algorithms using fresh
batteries. 8: Universal State-of Charge indication for battery-powered applications. 9: General
Conclusions.
