In the scope of DEMOBASE project, numerical simulation is used to design an efficient and safe storage system for a light weight electric vehicle. Multi-scale modelling is used in order to assess the safety of the battery pack when submitted to thermal and electrical abuse situations. 3 cells generations are to be studied in the project so that development times should be reduced. First study has been carried out on the first generation with the calibration of lumped electrothermal model taking into account thermal runaway. 0D numerical simulation on module behaviour with abuse tolerant design show the effect of new materials on the module safety.