The increasing spread and use of lithium-ion batteries in a wide range of applications requires targeted adaptation and optimization of the cell design with regard to their specific use case. Due to the conflicting demands on the development time and costs of such battery cells, the use of model-based approaches is necessary at an early stage of the cell development process. These approaches should make it possible to predict the electrochemical, thermal and/or mechanical behavior of the cell.

A critical design parameter that must be considered alongside temperature is the (electrode) pressure. Time-dependent volumetric changes occur in the electrodes due to various reversible and irreversible mechanisms at particle level. These mechanisms interact in complex ways with the material properties and structural characteristics of the cell as well as with operating behavior. In combination with the partially rigid housings and peripheral bracing systems, this results in dynamic pressures at cell level. These pressures have a significant influence on both the performance and the safety of the cell. It is therefore important to estimate them at an early stage and incorporate them into the design of the individual components.

In the context of the constant developments at the material level and increasing expansion behavior of future cell chemistries, the mechanisms must be identified and quantified to subsequently evaluate their influence on the cell properties. This analysis is crucial in order to continuously improve the efficiency and safety of new cell generations. Within this framework, this thesis therefore examines key relationships between electrode pressure and presents initial approaches for modeling changes in volume and pressure.