The utility model discloses a
power battery pack, a
battery system and a vehicle, and relates to the technical field of batteries. The
power battery pack comprises a shell, a first
battery pack, a second
battery pack and a
control unit, wherein the shell is provided with an accommodating cavity; the first
battery pack and the second battery pack are arranged in the accommodating cavity, the output
voltage of the first battery pack is higher than that of the second battery pack, and the first battery pack is connected with the second battery pack; the
control unit is arranged in the containing cavity and electrically connected with the first battery pack and the second battery pack. According to the
power battery pack provided by the embodiment of the invention, the first battery pack and the second battery pack are arranged in the same shell, so that the independent space occupied by the low-
voltage battery is reduced, the space resource occupied by the battery is reduced, and the space
utilization rate is improved. In addition, the
control unit is respectively connected with the two groups of batteries in the accommodating cavity, external complex lines are reduced,
line loss and fault risk are reduced, and
system stability and reliability are enhanced.