Power battery system detection method and device, storage medium and vehicle

The invention discloses a detection method and device of a power battery system, a storage medium and a vehicle, the power battery system comprises a plurality of monomers, the plurality of monomers are connected in series, and the method comprises the following steps: charging the power battery system to a full charge state; the power battery system is discharged to a first preset SOC value to an Mth preset SOC value, under the preset SOC values, pulse testing is carried out on the power battery system, performance indexes of all monomers are obtained, the ith preset SOC value is larger than the (i + 1) th preset SOC value, i = 1, 2,..., M, and M is an integer larger than or equal to 2; and according to the performance indexes, judging the monomer consistency of the power battery system. According to the method, pulse testing is carried out on a power battery system under different SOC values by taking a single monomer in the power battery system as an object, and the monomer consistency of the power battery