Abstract
According to the demand of vehicle lithium-ion battery pack, the splice equivalent circuit model is constructed. First, a joint experiment of intermittent discharge and hybrid power pulse characterization, basis of the requirements of parameter identification for the model, is designed to identify the parameters. Study shows that it can identify the parameters. Second, the splice equivalent circuit model of vehicle lithium-ion battery pack is simulated by MATLAB/Simulink, which shows the model is feasible to describe the vehicle lithium-ion battery pack. The simulation error of ohmic internal resistance R0 should be less than 0.05 mΩ. Study suggests that the vehicle lithium-ion battery pack has a stable discharge period within the state-of-charge range of [20%, 80%]. However, when stage of charge is below 20%, vehicle lithium-ion battery pack is no longer stable and the parameters of the splice equivalent circuit model change dramatically.
Highlights
Pure electric vehicles as clean vehicles have been paid enough attention because of the pressure of conventional power vehicles on fossil energy consumption.[1]
When state of charge (SoC) is higher than 20%, Rd and Rc fluctuate in a small range, and splice equivalent circuit model (S-ECM) introduces these two parameters to compensate for the inaccurate characterization of ohmic internal resistance on the internal resistance of lithium-ion battery pack during charging and discharging
The S-ECM model of pure electric vehicle lithium-ion battery is simulated in MATLAB/Simulink
Summary
Pure electric vehicles as clean vehicles have been paid enough attention because of the pressure of conventional power vehicles on fossil energy consumption.[1]. In order to reflect accurately the changing rule of battery, researchers have successively developed various resistance-capacitance (RC) equivalent circuit models.[14,15,16,17,18,19,20,21,22,23,24] More recent study in Wu et al.[25] fully considers the difference of internal resistance between charging/ discharging and improves the Thevenin model. This paper discusses one method to identify these parameters This model is applied to vehicle lithium-ion battery packs. Rc is a small variable of ohmic internal resistance caused by charging They can reflect the dynamic characteristics of lithium-ion battery pack during discharging/charging.
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