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Lithium-ion battery models that estimate their energy
content after a series of charge and discharge operations are
essential in the optimal design, analysis and operation of batterybased systems. We focus on the class of battery models that can
be calibrated entirely from the battery’s manufacturer-provided
specifications (spec). Such models are simple to calibrate and
are therefore widely used in practice. The best-known model in
this category was proposed by Tremblay et al. in 2007. This
model, however, has several shortcomings, including low fidelity
at high C-rates, and the fact that it does not model the battery
management system.We propose an alternative, called the Powerbased
Integrated (PI) model that is also completely spec-based, yet has much higher fidelity. We perform two types of validation, the first one uses the voltage profiles in the spec while the other is based on laboratory experiments. Both validations confirm that our model, which we have publicly released as a Simulink system block, has a mean absolute voltage error of less than 0.1 V across a wide range of C-rates.