Lithium-ion (Li-ion) is the most commonly used battery chemistry in portable applications nowadays. Accurate State-of-Charge (SoC) and remaining run-time (t,) calculation for portable devices is important for the user convenience and to prolong the lifetime of batteries. A new SoC algorithm for Li-ion batteries that combines adaptivity with direct measurement and book-keeping systems has been developed and implemented in a real-time evaluation system. In this paper the error sources in the real-time SoC evaluation system with possible calibration solutions are described. The goal of the SoC system is to predict the remaining run-time of aLi-ion battery with an uncertainty of I minute or better under all realistic user conditions, including a wide variety of load currents and a wide temperature range.
|Title of host publication||Proceedings of 18th IMEKO World congress 2006, Sept. 17-22, 2006, Rio de Janeiro, Brazil|
|Publication status||Published - 2006|