A Suite of Reduced-Order Models of a Single-Layer Lithium-ion Pouch Cell

TL;DR

This paper develops and compares a hierarchy of simplified, reduced-order models for lithium-ion pouch cells, balancing computational efficiency and accuracy for practical applications in thermal and isothermal conditions.

Contribution

It introduces a novel combination of simplifications for through-cell and transverse models, creating a hierarchy of reduced-order models with comprehensive numerical comparison.

Findings

Reduced-order models significantly decrease computational time.

Model performance varies with thermal conditions and drive cycles.

Recommendations provided for model selection based on resources and study goals.

Abstract

For many practical applications, fully coupled three-dimensional models describing the behaviour of lithium-ion pouch cells are too computationally expensive. However, owing to the small aspect ratio of typical pouch cell designs, such models are well approximated by splitting the problem into a model for through-cell behaviour and a model for the transverse behaviour. In this paper, we combine different simplifications to through-cell and transverse models to develop a hierarchy of reduced-order pouch cell models. We give a critical numerical comparison of each of these models in both isothermal and thermal settings, and also study their performance on realistic drive cycle data. Finally, we make recommendations regarding model selection, taking into account the available computational resource and the quantities of interest in a particular study.