Abstract:
The open circuit voltage (OCV) is a chemistry-dependent curve that characterizes the steady-state behaviour of a lithium-ion battery cell (LIB), namely the link between t...Show MoreMetadata
Abstract:
The open circuit voltage (OCV) is a chemistry-dependent curve that characterizes the steady-state behaviour of a lithium-ion battery cell (LIB), namely the link between the voltage accross the cell and its state of charge (SOC), when no load is connected. It is a fundamental ingredient to estimate the SOC of LIBs with any technique, ranging from a simple look-up table to a Kalman filter based on an equivalent circuit model or an electrochemical model. However, an accurate determination of such a steady-state curve for a commercial LIB requires extensive standalone experimental campaigns that are time-consuming. This work, compares two different methods, Karhunen-Loéve transform (or principal component analysis) and Gaussian process regressions, to model the zero-current behaviour of 18650 LIBs (Sony VTC6 and Samsung 30Q, 3000mAh) considering OCV-SOC charge and discharge experimental curves at C-rates between C/50 and C/5. The zero-current extrapolation given by these methods can reduce the experimental time up to 85% when compared to an average OCV characterized at C/100.
Published in: 2024 European Control Conference (ECC)
Date of Conference: 25-28 June 2024
Date Added to IEEE Xplore: 24 July 2024
ISBN Information:
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium
Université Libre de Bruxelles Av. Franklin, Brussels, Belgium