Battery management module and working method thereof, battery management system and electric vehicle

The invention relates to the technical field of batteries, and discloses a battery management module, a working method thereof, a battery management system and an electric vehicle. The battery management module comprises a main management unit, a standby management unit and a verification unit. The main management unit is used for managing and controlling the power supply system; the standby management unit is connected with the main management unit, and the verification unit is respectively connected with the main management unit and the standby management unit; and the verification unit is configured to judge whether the main management unit is abnormal or not according to information of at least two of the verification unit, the standby management unit and the main management unit, and switch the standby management unit to manage and control the power supply system when judging that the main management unit is abnormal. According to the battery management module provided by the invention, the operation rel