Abstract
An accurate estimation of the state of charge for lithium battery depends on an accurate identification of the battery model parameters. In order to identify the polarization resistance and polarization capacitance in a Thevenin equivalent circuit model of lithium battery, the discharge and shelved states of a Thevenin circuit model were analyzed in this paper, together with the basic reasons for the difference in the resistance capacitance time constant and the accurate characterization of the resistance capacitance time constant in detail. The exact mathematical expression of the working characteristics of the circuit in two states were deduced thereafter. Moreover, based on the data of various working conditions, the parameters of the Thevenin circuit model through hybrid pulse power characterization experiment was identified, the simulation model was built, and a performance analysis was carried out. The experiments showed that the accuracy of the Thevenin circuit model can become 99.14% higher under dynamic test conditions and the new identification method that is based on the resistance capacitance time constant. This verifies that this method is highly accurate in the parameter identification of a lithium battery model.
Highlights
The microscopic physical parameters of lithium batteries are difficult measure directly by sensors or measurement techniques [1,2,3]
[35,36,37], Thevenin model is often chosen as a battery model in battery State of of capacitors and resistors to simulate the dynamic voltage response characteristics of estimations of its simple structure difficulty in parameter batteries [28,29,30]
The model parameters are identified by hybrid pulse power characterization (HPPC) experiments, and the accuracy of the identification method is Analysis verified by simulation
Summary
The microscopic physical parameters of lithium batteries are difficult measure directly by sensors or measurement techniques [1,2,3]. In consists these models [35,36,37], Thevenin model is often chosen as a battery model in battery State of of capacitors and resistors to simulate the dynamic voltage response characteristics of Charge (SOC). In reference [41], a first-order equivalent circuit model of Thevenin based on self-healing is because the increase in order has little contribution to improving the accuracy of the model, and it characteristics is proposed and verified on the experimental platform. In orderIntoreference get accurate parameters, it is necessary to study the influence of working current, SOC and temperature on the identification method of the second-order Thevenin model with different discharge rate is studied. The model parameters are identified by hybrid pulse power characterization (HPPC) experiments, and the accuracy of the identification method is
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