BMS mainboard and BDU integrated structure and battery pack

The utility model provides a BMS mainboard and BDU integration structure and battery pack, the BMS mainboard and BDU integration structure comprises a BDU lower shell arranged between a front panel of a battery pack lower shell and a battery module, and a BDU electric device and a BMS mainboard which are arranged in the BDU lower shell, the BDU lower shell is provided with a front side wall facing one side of the front panel, and the BDU lower shell is provided with a back side wall facing the other side of the front panel. The rear side wall faces one side of the battery module, the front side wall is provided with a first avoiding part used for avoiding the convex mounting part on the front panel, and the rear side wall is provided with a second avoiding part used for avoiding an external conducting bar. According to the integrated structure of the BMS mainboard and the BDU, the BMS mainboard is integrated in the lower shell of the BDU, the space occupation area of the battery pack can be reduced, the space