Aspherix® and CFDEM®coupling can be applied to different aspects of battery modelling. Find below examples for modelling the electrical conductivity within a battery, its heating due to the change of the packing density, the simulation of a thermal runaway as well as the depiction of the drying process of a Li-ion battery with resolved-unresolved CFD-DEM.
The design of future battery materials is a big challenge, and the battery performance strongy depends on the packing properties. In the below animation we model the paste as particles in an electric potential. The material experiences heating due to the electric current.
This simulation shows a lithium-ion cell between two horizontal electrodes at different potentials.
The top electrode moves downwards two times to simulate compression of the battery pack due to impacts. As the distance between the two electrodes decreases, the electric current flowing through the cell increases (see top inset). A stronger current implies a higher Joule heating and, therefore, the reaching of higher temperatures in the cell (see top inset).
Simulation of a thermal runaway
During a thermal runaway of a Li-Ion battery hot gas exits the battery and burns. Using CFD we investigate the propagation of the flame front, velocities and pressures occurring during such an event.
Drying of Li-ion battery electrodes
A large size difference between active material and carbon black requires using resolved and unresolved CFD-DEM at the same time.
The hybrid resolved-unresolved CFD-DEM simulation of the drying process of Li-Ion battery electrodes reveals high dynamics and segregation although the process is very slow.
The left side of the animation shows that large particles are represented using resolved CFD-DEM. The small particles are modelled using unresolved CFD-DEM.