Journal of Electrical Engineering and Technology

  • 제13권4호
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  • Pages.1759-1768
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  • 2018
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  • 1975-0102(pISSN)
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  • 2093-7423(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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Parameter Identification of 3R-C Equivalent Circuit Model Based on Full Life Cycle Database

  • Che, Yanbo (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University) ;
  • Jia, Jingjing (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University) ;
  • Yang, Yuexin (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University) ;
  • Wang, Shaohui (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University) ;
  • He, Wei (State Grid Jiangxi Electric Power Research Institute)
  • 투고 : 2017.09.28
  • 심사 : 2018.02.05
  • 발행 : 2018.07.01
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초록

The energy density, power density and ohm resistance of battery change significantly as results of battery aging, which lead to decrease in the accuracy of the equivalent model. A parameter identification method of the equivale6nt circuit model with 3 R-C branches based on the test database of battery life cycle is proposed in this paper. This database is built on the basis of experiments such as updating of available capacity, charging and discharging tests at different rates and relaxation characteristics tests. It can realize regular update and calibration of key parameters like SOH, so as to ensure the reliability of parameters identified. Taking SOH, SOC and T as independent variables, lookup table method is adopted to set initial value for the parameter matrix. Meanwhile, in order to ensure the validity of the model, the least square method based on variable forgetting factor is adopted for optimizing to complete the identification of equivalent model parameters. By comparing the simulation data with measured data for charging and discharging experiments of Li-ion battery, the effectiveness of the full life cycle database and the model are verified.

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참고문헌

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