An equivalent circuit model with variable effective capacity for LiFePO4 batteries

  • Blanco C
  • Sanchez L
  • Gonzalez M
 et al. 
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Abstract

A new approach to equivalent circuit models for $hbox{LiFePO}_{4}$ batteries is presented in this paper. The proposed battery model is a semi-physical nonlinear dynamic model with variable effective capacity. Fuzzy logic has been used to capture the nonlinear behavior of the battery in combination with continuous-time differential equations. Fuzzy logic blocks are embedded in a state-space dynamic model as nonlinear constructive blocks. The proposed model has been validated for three different $hbox{LiFePO}_{4}$ batteries. The model provides an intuitive physical analogy between charging $hbox{LiFePO}_{4}$ batteries and filling a semi-rigid tank, which is useful for explanatory purposes.

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