By Valer Pop, Henk Jan Bergveld, Dmitry Danilov, Paul P. L. Regtien, Peter H. L. Notten
Battery administration structures: exact State-of-Charge Indication for Battery-Powered purposes describes the sector of State-of-Charge (SoC) indication for rechargeable batteries. With the emergence of battery-powered units competently estimating the battery SoC, or even extra vital the remainder time of use, turns into progressively more very important. an outline of the cutting-edge of SoC indication equipment together with to be had marketplace options from major semiconductor businesses, e.g. Texas tools, Microchip, Maxim, is given within the first a part of this publication. in addition, a common SoC indication process that permits 1% or larger accuracy lower than all sensible person stipulations is built. a potential integration with a newly constructed ultra-fast recharging set of rules is additionally defined. The contents of this booklet builds additional at the contents of the 1st quantity within the Philips learn e-book sequence, Battery administration structures - Design by means of Modelling. because the topic of battery SoC indication calls for a couple of disciplines, this ebook covers all very important disciplines ranging from (electro)chemistry to appreciate battery behaviour, through arithmetic to let modelling of the saw battery behaviour and size technological know-how to allow actual dimension of battery variables and review of the final accuracy, to electric engineering to permit an effective implementation of the constructed SoC indication approach. it is going to as a result function a major resource of knowledge for any individual operating in engineering and curious about battery administration.
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Extra resources for Battery Management Systems: Accurate State-of-Charge Indication for Battery-Powered Applications (Philips Research Book Series)
They involved excitation of the electrochemical cell by an ac voltage of small amplitude of about 5 mV and evaluation of the resistive and reactive components or other related parameters such as the modulus of impedance and phase angle. As such measurements encompass a wide range of ac signal frequencies, various characteristic parameters of the electrochemical cell and the kinetics of the associated reactions can be evaluated . As an alternative, Dowgiallo et al. (1975) and Zaugg (1982) developed methods for determining a battery’s SoC on the basis of impedance measurements , .
In addition to the OCV, the method presented by Eby et al. in 1978 also uses the voltage under load to determine the SoC of an LA storage battery during a discharge cycle . The battery’s initial OCV is stored in a settable memory. It has been demonstrated that in the case of LA batteries the OCV has a linear correlation to the charge level of the battery under a defined set of circumstances. The discharge rate can be determined at any moment in time as a comparison function between voltage under load and the corresponding OCV.
Besides Coulomb counting, the systems presented by Kikuoka  and Seyfang  also compensate for temperature, charging efficiency of the battery, self-discharge and aging. In  a battery’s capacity is monitored and compared with the initial capacity to obtain an indication of the battery’s SoH. When the battery is fully discharged or fully charged a particular set of parameters, such as the conversion efficiency of each battery, are ‘learned’ and updated to take into account the battery’s aging.