Parameterization and Observability Analysis of Scalable Battery Clusters for Onboard Thermal Management
Résumé
Although the battery surface temperature is commonly measured, the core temperature of a
cell may be much higher hence more critical than the surface temperature. The core
temperature of a battery, though usually unmeasured in commercial applications, can be
estimated by an observer, based on a lumped-parameter battery thermal model and the
measurement of the current and the surface temperature. Even with a closed loop observer
based on the measured surface temperature, the accuracy of the core temperature estimation
depends on the model parameters. For such purpose, an online parameterization methodology
and an adaptive observer are designed for a cylindrical battery. The single cell thermal
model is then scaled up to create a battery cluster model to investigate the temperature
pattern of the cluster. The modeled thermal interconnections between cells include cell to
cell heat conduction and convection to the surrounding coolant flow. An observability
analysis is performed on the cluster before designing a closed loop observer for the pack.
Based on the analysis, guidelines for determining the minimum number of required sensors
and their exact locations are derived that guarantee the observability of all temperature
states.
Domaines
Physique [physics]
Origine : Publication financée par une institution
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