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      A Study on the Open Circuit Voltage and State of Charge Characterization of High Capacity Lithium-Ion Battery Under Different Temperature

      , , , , , , , ,

      Energies

      MDPI AG

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          Abstract

          Open circuit voltage (OCV) is an important characteristic parameter of lithium-ion batteries, which is used to analyze the changes of electronic energy in electrode materials, and to estimate battery state of charge (SOC) and manage the battery pack. Therefore, accurate OCV modeling is a great significance for lithium-ion battery management. In this paper, the characteristics of high-capacity lithium-ion batteries at different temperatures were considered, and the OCV-SOC characteristic curves at different temperatures were studied by modeling, exponential, polynomial, sum of sin functions, and Gaussian model fitting method with pulse test data. The parameters of fitting OCV-SOC curves by exponential model (n = 2), polynomial model (n = 3~7), sum of sin functions model (n = 3), and Gaussian model (n = 4) at temperatures of 45 °C, 25 °C, 0 °C, and −20°C are obtained, and the errors are analyzed. The experimental results show that the operating temperature of the battery influences the OCV-SOC characteristic significantly. Therefore, these factors need to be considered in order to increase the accuracy of the model and improve the accuracy of battery state estimation.

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          Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs

           Gregory Plett (2004)
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            Evaluation of Lithium-Ion Battery Equivalent Circuit Models for State of Charge Estimation by an Experimental Approach

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              State of Charge Estimation of Lithium-Ion Batteries in Electric Drive Vehicles Using Extended Kalman Filtering

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                Author and article information

                Journal
                ENERGA
                Energies
                Energies
                MDPI AG
                1996-1073
                September 2018
                September 12 2018
                : 11
                : 9
                : 2408
                Article
                10.3390/en11092408
                © 2018

                https://creativecommons.org/licenses/by/4.0/

                Product
                Self URI (article page): http://www.mdpi.com/1996-1073/11/9/2408

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