The topic of this paper is the development of a device for safe and simple testing of battery packs in case of self-ignition of one of the cells inside the pack itself. The automotive industry is currently turning to the electrification of its vehicles in response to the environmental pollution caused by the exhaust gases of vehicles with internal combustion engines. Electric cars use electricity stored inside the cells of the battery pack as an energy source. Each battery pack stores large amounts of energy, which in case of damage to the cells inside the pack is released in the form of a sudden combustion of the cells, which causes a car fire. This is exactly why devices like this are needed to test different designs of battery packs in a safe and reproducible way so that the electric cars can be safer. In the paper, an analysis of the market and existing solutions for such devices was carried out. Interviews were also conducted with Rimac technology engineers who described their main requirements for this device since they will be using this device to test their battery packs. Engineers also provided some of the requirements that the device must meet for the approximate dimensions of the packages and modules that would be tested in the device. Also, a functional decomposition of the device was made, on the basis of which a morphological table was made. By combining different solutions for certain functions of the device, four concepts were created, which were evaluated against each other based on different criteria. The best-rated concept was then further developed, after which a 3D model and technical documentation of the device was created.