A battery pack comprising: a battery comprising at least one battery cell, connectors and heat exchanger means, and a battery housing comprising: a bottom enclosure comprising at least a base and an upstanding peripheral wall, the bottom enclosure is suitable to contain the battery, a lid suitable for closing the bottom enclosure, and fixation means suitable to maintain the lid on the bottom enclosure in order to close the battery pack housing, characterized in that the lid comprises at least a protrusion, the protrusion is positioned in order to press the battery assembly towards the center of the module, wherein the battery is contained inside the bottom enclosure and the lid is covering the bottom enclosure and retained by the fixation means inside the battery housing, adjacent to the wall of the bottom enclosure and the battery.