Research on a piecewise mathematical model with decay factor for battery

Guo Liang Wu, Chun Bo Zhu, Qing Quan Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


The classical battery equivalent circuit model has a shortcoming that it doesn't reflect the effects caused by electrochemical polarization and concentration polarization to battery terminal voltage well. In this study, in order to overcome the shortcoming, the classical equivalent circuit model for Nickel metal hydride battery used in electric vehicles was improved. According to the circuit theory, the analysis was carried out for the four different phases of battery by the improved equivalent circuit model. Four different phases were charge phase, change idle phase, discharge phase, discharge idle phase, respectively. A new piecewise mathematical model with decay factor was deduced according to the equivalent circuit equation. Pulse discharge and charge experiments were designed, and identification method of parameters was introduced. Predicted data by the model and measured data were compared and the results show the predicted data matched the measured data very well. In addition, the model exhibits good precision.

Original languageEnglish
Pages (from-to)188-192
Number of pages5
JournalDianji yu Kongzhi Xuebao/Electric Machines and Control
Issue numberSUPPL. 1
Publication statusPublished - Nov 2009
Externally publishedYes


  • Circuit theory
  • Decay factor
  • Electric vehicles
  • Nickel metal hydride battery
  • Piecewise mathematical models
  • Polarization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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