Portal de Periódicos da CAPES

Relaxation model of the open‐circuit voltage for state‐of‐charge estimation in lithium‐ion batteries

2013; Institution of Engineering and Technology; Volume: 3; Issue: 4 Linguagem: Inglês

10.1049/iet-est.2013.0020

2042-9746

Lei Pei, Rengui Lu, Chunbo Zhu,

Advanced Battery Materials and Technologies

The open-circuit voltage (OCV) of batteries is a crucial characteristic parameter that reflects many aspects of a battery's performance, such as capacity, state-of-charge (SOC) and state-of-health. OCV is most widely used to determine the SOC when the battery works in a charge-depleting state. However, the application of the OCV to SOC estimation can be difficult because of the need for a long rest time for full relaxation. In this study, based on the analysis on the curve shape of battery voltage relaxation, a new adaptive model for simulating the voltage relaxation process is developed to predict the final static OCV in a few minutes instead of via the traditional long-term rest method. Avoiding this disadvantage, the SOC can be deduced from the predicted OCV via the corresponding relationship obtained in a short amount of time. A working condition experiment is performed to validate the new methods and the results are very accurate.