Safety redundancy device for automobile power battery system

The utility model provides a safety redundancy device for an automobile power battery system, belongs to the technical field of an automobile power battery system, and solves the problem of high-pressure system safety of a pure electric vehicle. The device comprises a safety air bag ECU (electronic control unit), a BMS (battery management system) and a storage battery connected with a whole automobile high-pressure appliance, wherein the safety air bag ECU is connected with a crash sensor; the BMS is connected with a high-pressure contact which is used for cutting off power to the whole automobile high-pressure appliance; the main contact of the high-pressure contact is connected with the BMS, and the auxiliary contact of the high-pressure contact is connected in series between the storage battery and the high-pressure appliance; at least two signal processing modules are connected between the safety air bag ECU and the BMS; a crash signal detected by the crash sensor is received by the safety air bag ECU, is processed through the signal processing modules to form a corresponding processing signal, and the processing signal is transferred to the BMS; and a control signal is sent out to cut off the main contact of the high-pressure contact after the BMS receives the processing signal, and the auxiliary contact of the high-pressure contact is disconnected. The safety redundancy device can cut off the connection of the high-pressure system and the while automobile system in time through multiple protective circuits.