With the increasingly common use of high-voltage traction systems, whether for hybrid or full-electric powertrains, the automotive industry needed useful tools to study batteries and the electronic control units (ECU) associated with them. The aim of this thesis work, carried out at Kineton S.r.l., is to test a Battery Management System (BMS) in a Hardware-In-The-Loop (HIL) environment so that its behaviour and connections with a simulated battery pack can be analysed. After the BMS was selected, the electrical schematic and datasheet were studied to create a configuration between the device under test (DUT) and the HIL simulator to identify the inputs and outputs expected from the control unit.