Modelling and fault diagnosis of lithium-ion battery for electric powertrain

Abstract

In this study, an overall modelling of a lithium-ion battery pack is performed using a Matlab-Simulink interface. The model can simulate the performance of the individual cells and the battery pack. For each single cell, the model simulates the electrical behavior during the cycling phase and the relaxation phase thanks to an equivalent circuit model. The ageing behavior is also simulated, both at the cell and battery pack level. All the battery cell information is summarized in a vector and calculated using Kirchhoff’s law. A fault diagnosis strategy was also included in this model to simulate the continuous degradation and determine the current/voltage behavior of a lithium-ion battery pack following the malfunction of a cell.

Keywords

• Battery ageing
• Battery pack faults
• Cell relaxation time
• Equivalent circuit
• Lithium-ion battery modelling
• Matlab-Simulink
• State of charge
• WLTC

References

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