Power battery pack and power battery system

The utility model provides a power battery pack. The power battery pack comprises a plurality of monomer batteries, each monomer battery comprises n battery units, which are of the first battery unit, ..., the nth battery unit respectively, and n is not less than 2; the first battery unit in each monomer battery is connected with the first battery unit in the adjacent monomer battery in series for forming a first loop; and in such a way, the nth battery unit in each monomer battery is connected with the nth battery unit in the adjacent monomer battery in series for forming an nth loop. The utility model further provides a power battery system comprising a testing switch component and the power battery pack. The power battery pack provided by the utility model comprises a plurality of independent loops, under normal circumferences, all the independent loops are connected in parallel for forming the loop for output, and when a certain battery unit in the power battery pack is abnormal, the normal use of the bat