A Comparative Study of Open-Circuit-Voltage Estimation Algorithms for Lithium-Ion Batteries in Battery Management Systems

2019 ◽  
Author(s):  
Jianwen Meng ◽  
Moussa Boukhnifer ◽  
Demba Diallo
Keyword(s):  
Comparative Study ◽  
Lithium Ion Batteries ◽  
Open Circuit Voltage ◽  
Lithium Ion ◽  
Open Circuit ◽  
Management Systems ◽  
Battery Management ◽  
Estimation Algorithms ◽  
Battery Management Systems

scholarly journals Effects of cycling on lithium-ion battery hysteresis and overvoltage

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
V. J. Ovejas ◽  
A. Cuadras
Keyword(s):  
Mobile Applications ◽  
Open Circuit Voltage ◽  
Graphite Electrode ◽  
Lithium Ion ◽  
Open Circuit ◽  
Battery Management ◽  
Cell Efficiency ◽  
Battery Management Systems ◽  
Pure Phases ◽  
Determining Factor

Abstract Currently, lithium-ion batteries are widely used as energy storage systems for mobile applications. However, a better understanding of their nature is still required to improve battery management systems (BMS). Overvoltages and open-circuit voltage (OCV) hysteresis provide valuable information regarding battery performance, but estimations of these parameters are generally inaccurate, leading to errors in BMS. Studies on hysteresis are commonly avoided because the hysteresis depends on the state of charge and degradation level and requires time-consuming measurements. We have investigated hysteresis and overvoltages in Li(NiMnCo)O2/graphite and LiFePO4/graphite commercial cells. Here we report a direct relationship between an increase in OCV hysteresis and an increase in charge overvoltage when the cells are degraded by cycling. We find that the hysteresis is related to diffusion and increases with the formation of pure phases, being primarily related to the graphite electrode. These findings indicate that the graphite electrode is a determining factor for cell efficiency.

Sign in / Sign up

Export Citation Format

Share Document