Abstract
The software-in-the-loop and hardware-in-the-loop tests of a battery management system require a real-time compatible electro-thermal battery pack model. In our study, a numerically complex electrochemical-thermal model has been characterized from experimental data of a nickel-rich, silicon-graphite 18650-type lithium-ion cell. While it accurately represents the electro-thermal battery behavior, it is hardly suitable for real-time application due to its intensively numerical solving effort and related calculation time if no huge numerical efforts are applied to reduce the model. The objective of this paper is to present a simple method to derive a reduced-order electro-thermal cell model from the complex electrochemical-thermal cell model and build a real-time compatible battery pack model with the reduced-order cell model.
Highlights
The battery management system (BMS) is a critical component for electric vehicles
2: the initial following equation: circuit voltage starts from point (1); during a charge, the open circuit voltage approximates its high boundary defined by OCVc ; during a diff_i discharge, the∆U
The method requires only two tests per temperature to the electrochemical model to collect the simulated data of voltage and temperature
Summary
The battery management system (BMS) is a critical component for electric vehicles. During the development of BMS, several types of test can be done in order to evaluate its performance:. The problem to solve is to get a reduced-order electro-thermal cell model from the electrochemical-thermal model and build a battery pack model which is real-time compatible and ready for the SiL and HiL tests of BMS. The objective of this paper is to present a simple method to get a reduced-order electro-thermal cell model from a complex electrochemical cell model and build a battery pack model with the reduced-order cell model. It presents the validation of the method by comparing the simulation results between the two models. World Electric Vehicle Journal 2020, 11, 75 presents the battery pack model build from the reduced-order cell model in the simulation software.
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