A BMS wake-up method, characterized in that the method comprises: before a battery management system BMS hibernates, obtaining an extremum of first sampling information of a battery cell that is collected by a sampling chip, and determining, based on the extremum, a wake-up threshold corresponding to the first sampling information, wherein the wake-up threshold is used for the sampling chip to wake up the BMS that is hibernating; and when the BMS is hibernating, receiving a BMS wake-up signal transmitted by the sampling chip and waking up the BMS, wherein the BMS wake-up signal is transmitted by the sampling chip when it is determined that a sampling value of second sampling information of the battery cell reaches the wake-up threshold, and the second sampling information of the battery cell is collected by the sampling chip when the BMS is hibernating; wherein the first sampling information comprises a first sampling voltage, the second sampling information comprises a second sampling voltage, the wake-up threshold comprises a second abnormal voltage threshold, and the determining, based on the extremum, a wake-up threshold corresponding to the first sampling information comprises: determining a maximum of the first sampling voltage as a second target voltage value; and determining, based on the second target voltage value and a second voltage threshold, the second abnormal voltage threshold, wherein the second voltage threshold comprises a first voltage up-regulation threshold, a battery cell full charge voltage and a second voltage up-regulation threshold, and the determining, based on the second target voltage value and a second voltage threshold, the second abnormal voltage threshold comprises: determining a smaller one of a sum of the second target voltage value and the first voltage up-regulation threshold, and a sum of the battery cell full charge voltage and the second voltage up-regulation threshold as the second abnormal voltage threshold; wherein the first voltage up-regulation threshold is an unfixed value that changes with hibernation duration of the BMS. before a battery management system BMS hibernates, obtaining an extremum of first sampling information of a battery cell that is collected by a sampling chip, and determining, based on the extremum, a wake-up threshold corresponding to the first sampling information, wherein the wake-up threshold is used for the sampling chip to wake up the BMS that is hibernating; and when the BMS is hibernating, receiving a BMS wake-up signal transmitted by the sampling chip and waking up the BMS, wherein the BMS wake-up signal is transmitted by the sampling chip when it is determined that a sampling value of second sampling information of the battery cell reaches the wake-up threshold, and the second sampling information of the battery cell is collected by the sampling chip when the BMS is hibernating; wherein the first sampling information comprises a first sampling voltage, the second sampling information comprises a second sampling voltage, the wake-up threshold comprises a second abnormal voltage threshold, and the determining, based on the extremum, a wake-up threshold corresponding to the first sampling information comprises: determining a maximum of the first sampling voltage as a second target voltage value; and determining, based on the second target voltage value and a second voltage threshold, the second abnormal voltage threshold, wherein the second voltage threshold comprises a first voltage up-regulation threshold, a battery cell full charge voltage and a second voltage up-regulation threshold, and the determining, based on the second target voltage value and a second voltage threshold, the second abnormal voltage threshold comprises: determining a smaller one of a sum of the second target voltage value and the first voltage up-regulation threshold, and a sum of the battery cell full charge voltage and the second voltage up-regulation threshold as the second abnormal voltage threshold; wherein the first voltage up-regulation threshold is an unfixed value that changes with hibernation duration of the BMS. determining a smaller one of a sum of the second target voltage value and the first voltage up-regulation threshold, and a sum of the battery cell full charge voltage and the second voltage up-regulation threshold as the second abnormal voltage threshold; wherein the first voltage up-regulation threshold is an unfixed value that changes with hibernation duration of the BMS.