Measurements

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

Battery administration platforms: 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 thoroughly estimating the battery SoC, or even extra vital the remainder time of use, turns into a growing number of vital. an outline of the state of the art of SoC indication equipment together with on hand marketplace options from top semiconductor businesses, e.g. Texas tools, Microchip, Maxim, is given within the first a part of this publication. in addition, a common SoC indication approach that permits 1% or larger accuracy lower than all practical person stipulations is built. a potential integration with a newly built ultra-fast recharging set of rules can be defined. The contents of this booklet builds extra at the contents of the 1st quantity within the Philips learn booklet sequence, Battery administration structures - Design by way of Modelling. because the topic of battery SoC indication calls for a couple of disciplines, this booklet covers all very important disciplines ranging from (electro)chemistry to appreciate battery behaviour, through arithmetic to allow modelling of the saw battery behaviour and dimension technological know-how to let exact dimension of battery variables and review of the general accuracy, to electric engineering to permit an effective implementation of the built SoC indication method. it's going to for this reason function an immense resource of data for any one operating in engineering and taken with 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)

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In practice, however, cell or battery capacity is more commonly expressed in ampere-hours (Ah) or milliampere-hours (mAh). Of great importance for users is to know a battery’s SoC. In [37] SoC is defined as the percentage of the full capacity of a battery that is still available for further discharge. In [25] it is the ratio of a cell’s available capacity and its maximum attainable capacity. For a proper understanding of what the term ‘SoC’ really implies a clear definition is needed: SoC is the percentage of maximum possible charge that is present inside a rechargeable battery.

Two types of memory are needed. Basic battery data, such as the amount of self-discharge as a function of T and the discharging efficiency as a function of I and T, are read from the read-only memory (ROM). When the SoC algorithm is based on EMF measurements, the EMF–SoC relationship can be stored in ROM together with other battery-specific data. The random access memory (RAM) is used to store the history of use, such as the number of charge/discharge cycles, which can be used to update the maximum battery capacity.

A. Coulomb, 1736–1806), which describes the time a battery can produce a given current. The Coulomb is the unit of electric charge corresponding to one ampere-second (As). In practice, however, cell or battery capacity is more commonly expressed in ampere-hours (Ah) or milliampere-hours (mAh). Of great importance for users is to know a battery’s SoC. In [37] SoC is defined as the percentage of the full capacity of a battery that is still available for further discharge. In [25] it is the ratio of a cell’s available capacity and its maximum attainable capacity.

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