Emergency power-off device for electric automobile battery box

The utility model relates to a protective device for an electric automobile battery box. An emergency power-off device for the electric automobile battery box comprises the battery box (1), wherein a plurality of single batteries are arranged in the battery box; the single batteries are connected with one another in series and then connected to a positive electrode column and a negative electrode column at the top end of the battery box; a fuse (2) is connected in series between the positive electrode of the previous battery box and the negative electrode of the next battery box; a plurality of battery boxes are connected with one another in series to form an electric automobile power supply; a contact of a relay (4) is connected in series between the positive electrode column and the negative electrode column of each battery box; the relay is connected with a battery control unit (3) of each battery box; and after the states of the batteries and the battery boxes are detected by the battery control unit, the opening and the closing of the relay contact are controlled. The emergency power-off device for the electric automobile battery box has a safe and reliable structure, and a simple control mode, and can singly power off the battery boxes under the emergency condition so as to enhance the safety performance of the power batteries and guarantee the power output of the whole electric automobile.