A battery pack is disclosed according to the present disclosure. The battery pack includes: a housing (1), a cover (2), a cell set (3) and a bus bar (4). The housing (1) includes a receiving cavity (11) with an opening on a side of the housing (1). The cover (2) is provided over the side of the housing (1) with the opening to close the receiving cavity (11). The cell set (3) is provided in the receiving cavity (11), and electrodes of the cell set (3) face the cover. The bus bar (4) is provided between the cell set and the cover (2), and a pressure relief space (6) is reserved between the bus bar (4) and the cover (2). The receiving cavity (11) is filled with insulating cooling oil, and the electrodes of the cell set (3) and the bus bar (4) are submerged in the insulating cooling oil.
