An accurate state of charge (SOC) estimation is the basis of the Battery Management System (BMS). In this paper, a new estimation method which considers fractional calculus is proposed to estimate the lithium battery state of charge. Firstly, a modified second-order RC model based on fractional calculus theory is developed to model the lithium battery characteristics. After that, a pulse charac...

Battery is the most widely used energy storage device. Since its invention, it has become a common power source for various household, commercial and industrial applications. Despite its ever increasing importance, many challenges remain unsolved to characterize and manage the battery. Among them, one fundamental issue is the estimation of state of charge (SoC), and Sate of health (SOH) of batt...

This paper presents a real-time strategy for active power sharing in a fuel cell powered battery charging station. This control scheme can adjust the charging currents of the batteries being simultaneously charged in real-time according to the estimated state-of-charge (SOC) which is obtained by estimating the battery open-circuit voltage with current correction and linearly fitting between the...

The main goal of a battery management system (BMS) is to estimate parameters descriptive the pack operating conditions in real-time. One most critical aspects BMS systems estimating battery's state charge (SOC). However, case lithium-ion battery, it not easy provide an accurate charge. In present paper we propose mechanism based on extended kalman filter (EKF) improve state-of-charge estimation...

To develop an advanced battery estimation unit for electric vehicles application, the state-of-charge (SoC) estimation is proposed with an unscented Kalman filter (UKF) and realized with the RTOS lCOS-II platform. Kalman filters are broadly used to deploy various battery SoC estimators recently. Herein, an UKF algorithm has been employed to develop a systematic adaptive SoC estimation framework...

Safety issues concerning the use of large lithium-ion (Li-ion) batteries in electrified vehicles are discussed based on the abuse test results of Li-ion cells together with safety devices for cells. The presented abuse tests are: overcharge, short circuit, propane fire test and external heating test (oven). It was found that in a fire, cells with higher state of charge (SOC) gave a higher heat ...

Electroabsorption studies of ruthenium(II) tris(phenanthroline) show that a substantial change in dipole moment (|Delta&mgr;| = 6.7 +/- 1 D) accompanies ground state to "singlet" metal-to-ligand charge transfer (MLCT) excited-state formation. The change is nearly identical to that reported for the 2,2'-bipyridine analogue (Oh; et al. J.Am. Chem. Soc. 1989, 111, 1130). Since both species lack gr...

This chapter presents a method of determining electromotive force (EMF) and battery internal resistance as time functions, which are depicted as functions of state of charge (SOC). The model is based on battery discharge and charge characteristics under different constant currents that are tested by a laboratory experiment. Further the method of determining the battery SOC according to the batt...

ABSTRAKPenggunaan perangkat penyimpan energi semakin lama meningkat pada peralatan berdaya kecil maupun besar. Baterai selama ini menjadi pilihan utama sebagai energi. Namun akhir-akhir ultrakapasitor alternatif karena lifetime lebih panjang dan respon daya sesaat yang jauh besar dari baterai. Pada manuskrip dibahas tentang estimasi nilai State of Charge (SoC) ultrakapasitor. Estimasi dilakukan...

Battery management systems (BMS) must estimate the state‐of‐charge (SOC) of the battery accu‐ rately to prolong its lifetime and ensure a reliable operation. Since batteries have a wide range of applications, the SOC estimation requirements and methods vary from an application to another. This paper compares two SOC estimation methods, namely extended Kalman filters (EKF) and ar‐ tificial neura...