The present invention relates to a vehicle block, wherein the electronic components P are seated in the inner space 10 ′ surrounded by the side walls 11 so that one side is opened, and a connection portion in which the battery bus bar 30 extending from the battery is seated. The edge of the concave inlet 22 formed at a position corresponding to the base 10 and the inner space 10 ′ with 12 and coupled to the base 10 so as to cover the inner space 10 ′. It includes a cover 20 on which a safety ring 23 for connecting is formed, and the safety ring 23 is in close contact with the outer surface of the side wall 11 so as to surround the edge of the connection part 12 and the base 10 and the When the cover 20 is separated and the battery bus bar 30 is first connected to the connection part 12, the safety hook 23 interferes with the battery bus bar 30, and the connection part 12 In a state in which the battery bus bar 30 is seated and the base 10 and the cover 20 are coupled, the safety hook 23 is removed from the base 10 when the cover 20 is first separated from the base 10. It interferes with the battery bus bar 30. According to the present invention, the operator can open the cover only when the battery bus bar is separated from the base, and the battery bus bar can be coupled to the base only when the cover is combined with the base, thereby preventing an electric shock accident.