Advancements in OCV Measurement and Analysis for Lithium-Ion Batteries

Incremental open-circuit voltage (OCV) curves and low-current charge/discharge voltage profiles of a lithium-ion (Li-ion) battery are compared and evaluated for optimizing measurement time and resolution. Since these curves are often used for further analysis, minimizing kinetic contributions is cru...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2013-09, Vol.28 (3), p.675-681
Main Authors: Petzl, Mathias, Danzer, Michael A.
Format: Article
Language:English
Subjects:
Approximation
Batteries
Battery charge measurement
Battery open-circuit voltage (OCV)
Charge
Current measurement
Data points
Electric potential
Electrodes
extrapolation
Interpolation
Intervals
Li-ion
Lithium-ion batteries
Relaxation time
State of charge
Studies
Voltage
Voltage measurement
voltage relaxation
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Summary:Incremental open-circuit voltage (OCV) curves and low-current charge/discharge voltage profiles of a lithium-ion (Li-ion) battery are compared and evaluated for optimizing measurement time and resolution. Since these curves are often used for further analysis, minimizing kinetic contributions is crucial for approximating battery OCV behavior. In this context, an incremental OCV measurement is characterized by state of charge (SOC) intervals and relaxation times. Various constant low C-rates, SOC intervals, and relaxation times are tested for approximating OCV behavior. Differential capacity and voltage analysis is used to check whether the main electrode features can be resolved satisfactorily. An interpolation method yields additional data points for the differential analysis of incremental OCV curves. It is shown that incremental OCV measurements are suitable for an approximation of battery OCV behavior, rather than low current-voltage profiles. Furthermore, extrapolation of voltage relaxation enables the estimation of fully relaxed OCV.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2013.2259490