期刊
JOURNAL OF POWER SOURCES
卷 490, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229513
关键词
Lithium-ion battery; Electric model; Pulse characterization; Equivalent circuit model; Battery parameter; Battery simulation
资金
- European Union's Horizon 2020 research and innovation program [653851]
- H2020 Societal Challenges Programme [653851] Funding Source: H2020 Societal Challenges Programme
A new method for precise parameterization of an equivalent circuit model from pulse tests is presented, with the robustness of such models increased by limiting the voltage of the RC element with the highest time constant. As a result, a precise and reliable model of a lithium-ion battery cell is created, with only a minor root-mean-square error of 1.30%.
This article presents a novel approach to extract the equivalent circuit model parameter from a pulse test. The presented results corroborate that this novel heuristic methodology can very accurately fit the voltage response of the battery, while drastically reducing the dependence of the parametrization on set boundary conditions and initial guess values. The method's robustness is verified by fitting the voltage response of a mock battery model with pre-defined parameters. It could be shown that the suggested method is able to precisely extract the set parameters from the simulated voltage. Furthermore, the model values obtained from the test of a lithium ion battery cell correlate with physical parameter and other investigation methods like the calculation of the distribution of relaxation times (DRT). As a result, an accurate equivalent circuit model of the cell was created. The restriction as to universal validity of the empirical equivalent circuit model was significantly reduced by limiting the voltage of the RC element with highest time constant. Finally, a robust battery cell model with only a minor root-mean-square error of 1.30% was obtained. Result: A new method for the precise parameterization of an equivalent circuit model from pulse tests is presented. The robustness of such equivalent circuit models is increased by limiting the voltage of the RC element with the highest time constant. Overall, a precise, reliable model of a lithium-ion battery cell is created.
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