The market for lithium-ion batteries is growing, and customised and optimised cell con-cepts are becoming increasingly important. Different cell design requirements can be evaluated at an early stage in the development of prototypes for application-specific cell concepts such as high energy and high power cells. One method is numerical simulation, which uses mathematical and physical models to predict the thermal and electrochemi-cal behavior of a battery cell. Of particular interest are the temperature and charge dis-tribution (lithium and electron distribution within the electrode coating) of the battery cell. Predictions about the performance and safety of the battery cell can be made on the basis of these parameters. For the numerical modelling of the battery cell, multi-domain approaches are chosen in order to map the physical variables on different di-mensional levels. At the same time, spatial resolutions are chosen to optimise computa-tional times.The design of the tabs has great potential for optimization. By adjusting the size and arrangement of the tabs, the performance of the cell can be optimized without having to adjust the electrode configuration. This means that the layer thicknesses, number of layers or XXX do not have to be adjusted. Thus, the optimization of the tab design is only linked to the assembly. Manufacturing changes in electrode production or cell finalization are not necessary In addition, the changes at energy density level (volu-metric/gravimetric) are maginal, so that they do not need to be taken into account.