Development and Verification of a Distributed Electro-Thermal Li-Ion Cell Model

Abstract

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Universal Li-Ion Cell Electrothermal Model

“…To account for this, a 1D nodal distribution is incorporated into the electrical and thermal models. An explanation of the underlying approach is provided in our previous publication [25].…”

“…The power terms consist of irreversible joule heating ̇, reversible entropic power transfer ̇, convection between the cell and environment ̇ and power transfer due to external cooling ̇. The thermal model has been explained previously in [25].…”

“…They can vary dramatically in their objectives and functionality, with some being simple and still largely empirical, while others incorporate electrochemical-principles in their design [20], [21]. Most approaches use variations of an RCR model, consisting of a resistor followed by a number of Resistor-Capacitor pairs which give the model dynamic voltage response to current [22]- [25]. These models can be designed to give a good balance between computational effort and accuracy [26], and the parameterization and model development process can be largely automated, making them easy to apply quickly to new cell geometries.…”

“…The optimum number of RC elements to get a good fit has been explored previously [25], [26] but often only at 1 temperature. With temperature the time constants and magnitudes of resistance contributions change [3], [4], [21], [24].…”