Entropy profile of NCR 18650 cylindrical cell at various states of health
Serik Y. Adair D. Bakenov Z. Uzakbaiuly B.
30 September 2024Elsevier Ltd
Heliyon
2024#10Issue 18
Entropy measurement at various states of charge (SOC) is a potential non-destructive tool for characterizing lithium-ion batteries; however, traditional potentiometric methods are time-consuming. To address this, we developed a fast potentiometric method that estimates entropy by employing charging after pulse discharging to partly eliminate voltage relaxation. This method, combined with precise mathematical processing, reduces estimation time by approximately 4.5 times compared to conventional approaches. We validated the method by comparing it with the traditional potentiometric method and applied it to obtain entropy profiles of an NCR 18650 Panasonic battery at various cycle numbers at a 1.5C rate. Additionally, we investigated how entropy changes with variations in the batterys state of health (SOH). The study established coefficients for a mathematical model representing SOC across different SOH, revealing a strong correlation for SOC estimation.
Entropy , Li-ion batteries , Potentiometry , State of charge , State of health
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Nazarbayev University, Kabanbay Batyr Ave 53, Astana, Kazakhstan
Al-Farabi Kazakh National University, Al-Farabi Ave 71, Almaty, Kazakhstan
Institute of Batteries LLC, Kabanbay Batyr Ave 53, S4, Astana, Kazakhstan
National Laboratory Astana, Kabanbay Batyr Ave 53, S2, Astana, Kazakhstan
Fraunhofer IKTS, Ausere Nuernberger str 62, Forchheim, Germany
Nazarbayev University
Al-Farabi Kazakh National University
Institute of Batteries LLC
National Laboratory Astana
Fraunhofer IKTS
10 лет помогаем публиковать статьи Международный издатель
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