Abstract: Battery cell, with rolled electrodes, with at least one border of bent poles to form a base at at least one end, wherein it is continued with a wool cushion bridge, electrothermal conductor collector at the battery cell terminal, encapsulated assembly, sealed in a composite box with a flexible, elastic, electrically insulating body, which is also an expansion vessel in the event of the formation of an internal gas due to the electrochemical reaction between the anode and the cathode, housing and storing the flammable gas inside, sealed with the outside, and the pressure is measured in real time by an internal pressure sensor that transmits the data in real time to the BMS and/or to the battery cell controller. The battery cells are provided with heat exchanger device and are assembled into modules and racks, with air or air-liquid hybrid passive or forced cooling system.