Capacity loss in rechargeable lithium cells during cycle life testing: The importance of determining state-of-charge

Simplified Modelling of a Battery Parameters and Application in Electric Vehicle Battery Charging Based on State of Power (SoP) and State of Energy (SoE)

“…It uses the basic blocks from [4] and uses the equations (16)(17)(18)(19)(20)(21)(22)(23)(24) power is fed to the battery pack. Otherwise, the maximum power that the battery pack can take, that is only send to the battery pack.…”

“…In practical cases, the user may not know the initial value of the state of charge. So, an adaptive SoC estimation algorithm [8,19,20] was developed to adapt the SoC and voltage profile with the actual values. Our main aim is to estimate the state-of-charge of the battery without any prior information of the battery except the measured voltage of the battery and the current profile was subjected to.…”

“…Measurement of the state-of-charge while vehicle is driving is a challenging task as calculation of charge replenished or depleted does not necessarily mirror the state-of-charge of the battery [4,19]. So, in this paper, the online estimation of the state-of-charge with the information of current and voltage of the battery was investigated.…”

A Generalized SOC-OCV Model for Lithium-Ion Batteries and the SOC Estimation for LNMCO Battery

“…In the tests, the batteries were first discharged to the cutoff voltage with 1/20 C rated and rested for 2 h. Then, batteries were charged to the cutoff voltage, followed by a 2 h rest and then discharged to the cutoff voltage. Both the charge/discharge rate were 1/20 C. Arbin Instruments BT2000 test systems were used for the tests, and, during the test, batteries were put in the temperature chamber at 25 • C. SOC = Q res /Q max , where Q res represents residual capacity of the battery, and Q max is the maximum available capacity at the current of 1/20 C. From the test data, V-SOC curves for charge/discharge regime can be obtained, respectively, and then, by averaging the two V-SOC curves, the OCV-SOC curve of a battery is determined [22].…”

Modeling charge polarization voltage for large lithium-ion batteries in electric vehicles

“…As one of power supplies, the performance of lithium-ion batteries will have direct effects on the driving performance and operating economy of the vehicle. It was reported that battery charging contributed more to capacity fading compared to battery discharging (Dubarry, Svoboda, Hwu, & Liaw, 2007a, 2007b. It is therefore necessary to investigate the charging characteristics and associated affect factors of the battery.…”