The thesis presented in this document describes the design of a high-voltage battery pack, intended for the propulsion of a sport utility vehicle (SUV). The study was carried out at ANKERS Juss-Amg s.r.l., an engineering consulting company based in Turin (TO, Italy) which provides C.A.E. (Computer-Aided Engineering) analysis and design services for the automotive-aerospace field. In detail, the vehicle in question is an existing prototype of a battery electric vehicle (BEV), called P1. It comes from the previous version, called P0, which had a very poor performance in terms of battery. The aim of the thesis is therefore the design of a new battery pack from scratch; furthermore, since the prototype already exists, the limit dimensions of the battery compartment are fixed and both the DC/AC converter and the electric motor are known.