A Parameter Identification Method for Dynamics of Lithium Iron Phosphate Batteries Based on Step-Change Current Curves and Constant Current Curves

Zhichao He, Geng Yang and Languang Lu
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Zhichao He: Department of Automation, Tsinghua University, Beijing 100084, China
Geng Yang: Department of Automation, Tsinghua University, Beijing 100084, China
Languang Lu: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Energies, 2016, vol. 9, issue 6, 1-24

Abstract: Parameterization of battery dynamics based on terminal operating data is a main concern in engineering applications of batteries. The key technology is designing an adequate test procedure and a data processing procedure to excite different inner dynamics and then estimate the parameters of a corresponding equivalent circuit model (ECM). This paper proposes a parameter identification method that utilizes the terminal voltage curves (TVC) under step-change current conditions and constant current conditions. With this method, I - V characteristics of battery’s Ohmic resistance, mass diffusion process, thermal process and SOC varying process are decoupled and parametric functions of an ECM are obtained. Experimental results show that the method is easy to be implemented and modeling accuracy is sufficient for applications.

Keywords: parameter identification; decouple; step-change current curves; constant current curves (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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