Within battery recycling, a deep understanding of the micro-and macroscopic phenomena occurring at each step of the process is essential to identify the parameters with the highest impact, and thus, optimize the efficiency and sustainability of the process line. Physics-based simulations are widely used by researchers to study complex phenomena occurring on such scales. This subsection will focus on the simulation of recycling from micro-up to macroscopic scales and will shed light on how computational tools can be used to optimize our ability to recycle battery materials.