This thesis wants to cover some of the lack left by the Electric Energy Storage systems’ technical standards, since today these documents prescribe mostly Qualitative Risk Assessment’s techniques to address the Li-ion’s batteries’ Thermal Runaway’s issue and its correlated accidents like fire, toxic dispersion, and explosion. The normative and legislative framework proves to be delayed respect to the available market’s solutions. This is contributing to an increasing of the Electric Energy Storage systems’ accidents worldwide in parallel with the large-scale deployment of this technology that is dictated by the needs to reduce CO2 emissions in the next decades. This document proposes a computational fluid dynamics’ simulation of a Li-ion battery module’s fire with the help of Fire Dynamic Simulator’s software.