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Open-Circuit Voltage Variation in LiCoO 2 Battery Cycled in Different States of Charge Regions

Author

Listed:
  • Simone Barcellona

    (Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milan, Italy)

  • Lorenzo Codecasa

    (Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milan, Italy)

  • Silvia Colnago

    (Department of Generation Technologies and Material, Ricerca sul Sistema Energetico S.p.A., 20134 Milan, Italy)

  • Luigi Piegari

    (Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milan, Italy)

Abstract

Currently, the urgent needs of sustainable mobility and green energy generation are driving governments and researchers to explore innovative energy storage systems. Concurrently, lithium-ion batteries are one of the most extensively employed technologies. The challenges of battery modeling and parameter estimation are crucial for building reliable battery management systems that ensure optimal battery performance. State of charge (SOC) estimation is particularly critical for predicting the available capacity in the battery. Many methods for SOC estimation rely on the knowledge of the open-circuit voltage (OCV) curve. Another significant consideration is understanding how these curves evolve with battery degradation. In the literature, the effect of cycle aging on the OCV is primarily addressed through the look-up tables and correction factors applied to the OCV curve for fresh cells. However, the variation law of the OCV curve as a function of the battery cycling is not well-characterized. Building upon a simple analytical function with five parameters proposed in the prior research to model the OCV as a function of the absolute state of discharge, this study investigates the dependency of these parameters on the moved charge, serving as an indicator of the cycling level. Specifically, the analysis focuses on the impact of cycle aging in the low-, medium-, and high-SOC regions. Three different cycle aging tests were conducted in these SOC intervals, followed by the extensive experimental verification of the proposed model. The results were promising, with mean relative errors lower than 0.2% for the low- and high-SOC cycling regions and 0.34% for the medium-SOC cycling region. Finally, capacity estimation was enabled by the model, achieving relative error values lower than 1% for all the tests.

Suggested Citation

  • Simone Barcellona & Lorenzo Codecasa & Silvia Colnago & Luigi Piegari, 2024. "Open-Circuit Voltage Variation in LiCoO 2 Battery Cycled in Different States of Charge Regions," Energies, MDPI, vol. 17(10), pages 1-17, May.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:10:p:2364-:d:1394148
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    References listed on IDEAS

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