The following thesis project is aimed at the study of the thermal behavior of a 3s3p Li-Ion battery pack and at proposing an innovative solution of communication between cell boards and BMS, based on the wireless Bluetooth 5.0 LE technology. In the first part of the project, the entire battery pack, including casing, bus bar mount and fluid dividers, have been designed on CAD environment, and then through CFD simulations have been refined so to avoid generation of turbulences and points of stagnation which could deteriorate the effectiveness of the cooling. Then, after have printed the components and connected the cells so to generate a 3s3p battery, the pack has been created and subjected to tests with forced air cooling, so to compare the results obtained through CFD simulations.