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 summary of the state of the art of SoC indication tools together with to be had marketplace suggestions from best semiconductor businesses, e.g. Texas tools, Microchip, Maxim, is given within the first a part of this publication. in addition, a common SoC indication procedure that permits 1% or higher accuracy below all life like consumer stipulations is constructed. 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 via 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 permit modelling of the saw battery behaviour and size technological know-how to let exact dimension of battery variables and overview of the general accuracy, to electric engineering to allow an effective implementation of the built SoC indication procedure. it is going to consequently function a tremendous resource of data for any one operating in engineering and enthusiastic about battery administration.
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Additional resources for Battery Management Systems: Accurate State-of-Charge Indication for Battery-Powered Applications (Philips Research Book Series)
For this reason an adaptive system has to be used, which is based on direct measurement, book- State-of-the-Art of battery State-of-Charge determination 35 keeping or a combination of the two . Some examples of existing adaptive SoC systems will be described in this section. In , – optimum Kalman filters are presented for implementing an adaptive method in connection with parameter estimation to determine SoC. The basis of the filter is a numeric battery model description. In  the battery voltage is estimated on the basis of current and temperature measurements and then the results are compared with the measured battery voltage value (see Fig.
Adaptivity of the model is based on a comparison of the estimated values with observed battery behaviour. This comparison is made whenever possible. The purpose of a Kalman filter is to estimate a system’s state on the basis of measurements, which contain errors. The filter has the advantage of being sequential – it needs only the system variables of the previous sample and the forcing terms and observations of the current sample. Fig. 13. Method for SoC and SoH determination using a Kalman filter .
Curtis SoC gauges were even used on the Moon (see Fig. 4) . Fig. 4. Astronauts exploring the Moon in Lunar Roving Vehicles in 1971–1972 relied on early Curtis gauges . 18 Chapter 2 In one of the Curtis patents filed by Finger et al. in 1975 the current flowing from the battery is sent to an integrator module, which registers the current depletion . During charging, the current is integrated in the integrator module providing a continuous display of the SoC and information needed to regulate the charge rate.
Battery Management Systems: Accurate State-of-Charge Indication for Battery-Powered Applications (Philips Research Book Series) by Valer Pop, Henk Jan Bergveld, Dmitry Danilov, Paul P. L. Regtien, Peter H. L. Notten