BATTERY MODULE AND BATTERY

A battery module (100) and a battery (200), comprising at least one battery module (100). The battery module comprises plurality of battery cells (1), the battery cell comprising a terminal (2) made of aluminium or aluminium alloy, and a busbar (3) made of aluminium or aluminium alloy, the busbar being arranged for interconnecting terminals (2) in a same electrical polarity of said plurality of battery cells (1) in an electrically conductive way. The busbar (3) is further arranged for connecting the plurality of battery cells to an electrical conductor element (4) made of copper or copper alloy. The busbar (3) comprises a purposely passivated surface (5).