Vehicle battery protection device and vehicle battery fault detection method

The invention provides a vehicle battery protection device and a vehicle battery fault detection method. The vehicle battery protection device comprises a detection module, an alarm module and a control module which are arranged outside a battery. The heat dissipation mechanism is arranged in the battery and comprises an evaporation backflow assembly and an extrusion assembly, the evaporation backflow assembly comprises a conical pipe, the conical pipe comprises a pipe body and a conical opening formed in the top of the pipe body, and the conical opening is formed in the outer portion of the battery; the extrusion assembly comprises an air bag structure and a driving structure, the driving structure is arranged above the air bag structure and electrically connected with the control module, and the bottom of the tube body is inserted into the air bag structure so that the conical tube can communicate with the air bag structure. According to the vehicle battery protection device and the vehicle battery fault de