Download PDF by Valer Pop, Henk Jan Bergveld, Dmitry Danilov, Paul P. L.: Battery Management Systems: Accurate State-of-Charge
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 sphere of State-of-Charge (SoC) indication for rechargeable batteries. With the emergence of battery-powered units adequately estimating the battery SoC, or even extra very important the rest time of use, turns into an increasing number of very important. an summary of the state of the art of SoC indication equipment together with on hand industry strategies from prime semiconductor businesses, e.g. Texas tools, Microchip, Maxim, is given within the first a part of this ebook. in addition, a common SoC indication procedure that permits 1% or greater accuracy below all life like consumer stipulations is constructed. a potential integration with a newly constructed ultra-fast recharging set of rules is usually defined. The contents of this ebook builds additional at the contents of the 1st quantity within the Philips examine booklet sequence, Battery administration platforms - Design through Modelling. because the topic of battery SoC indication calls for a few disciplines, this ebook covers all very important disciplines ranging from (electro)chemistry to appreciate battery behaviour, through arithmetic to allow modelling of the saw battery behaviour and size technological know-how to let actual size of battery variables and evaluate of the general accuracy, to electric engineering to permit a good implementation of the built SoC indication procedure. it is going to hence function a big resource of knowledge for any individual operating in engineering and inquisitive about battery administration.
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Additional info for Battery Management Systems: Accurate State-of-Charge Indication for Battery-Powered Applications (Philips Research Book Series)
A Coulomb counter cannot measure this quantity of charge as no net current flows through the battery terminals. A battery’s self-discharge rate will depend strongly on temperature and on the SoC. Capacity loss. The maximum possible battery capacity in Ah decreases when a battery ages. The capacity loss depends on many factors. In general, the more the battery is misused, for example overcharged and overdischarged on a regular basis, the larger the loss will be. In most commercial book-keeping systems voltage measurement is often used to update the maximum battery capacity so as to deal with capacity loss .
Li-ion batteries. A schematic representation of a typical Li-ion cell is shown in Fig. 2 . 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.
In  voltage levels are measured during battery charge and discharge and compared with predetermined values, which are modified as a function of temperature. The stored battery charge or discharge curves are divided into curve portions defined by voltage levels and rates of changes of the voltage levels. Each curve portion defines a particular SoC of the battery. Measured voltage levels and rates of changes are then associated with the predetermined charge or discharge curve portion and the defined SoC.
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