Journal
JOURNAL OF ENERGY STORAGE
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.102031
Keywords
Dynamic equivalent electric circuit model; discharging behavior; self-discharging; nonlinear parameter analysis; Valve Regulated lead-Acid battery; battery capacity; temperature estimation
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The paper presents a study on the nonlinear dynamic equivalent electric circuit model of a VRLA battery, focusing on identifying the nonlinear battery parameters influenced by temperature during discharging and self-discharging processes. The experimental results show that the model accurately predicts the voltage response of the battery.
The dynamic model of a battery is necessary for the appropriate real-time control during the charge/discharge process. The present paper considered the nonlinear Dynamic Equivalent Electric Circuit Model (DEECM) of a Valve Regulated Lead-Acid (VRLA) battery based on the data obtained through the experimentation and the available datasheet information. This work focuses on the identification of the nonlinear battery parameter during discharging and self-discharging with the influence of battery temperature. Experimentations are carried out on a 12V, 26Ah VRLA battery. Accordingly, experimental v-i characteristics of the battery are used to express the nonlinear model parameters as a function of measured battery current and estimated open-circuit voltage. The DEECM is validated through voltage response test with different steps of discharging current. The model results exactly match the experimental results for step increasing load with maximum error of +0.08% and for step decreasing load with maximum error of +0.4%.
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