Patent ID: 8038487

Claim:
An electrode structure for connecting a battery module to a bus bar, comprising: a metal terminal having a base and a tip end, the base being fixed to a body of the battery module, the tip end being spaced apart by a predetermined distance from the body of the battery module and connected to the bus bar; a nut arranged between the tip end of said metal terminal and said body of the battery module; a screw shaft screwed into the nut and penetrating through the tip end of said metal terminal and the bus bar; an insulator arranged between the base of said metal terminal and the body of the battery module; and an engaging member in engagement with a periphery of said nut, wherein said engaging member has one of a key and a slot extending in a direction of insertion of the nut between the tip end of said metal terminal and said insulator, said insulator has the other of a key and a slot to be engaged with the key or slot of said engaging member, and said insulator and said engaging member in engagement with said nut are engaged together by said key and slot to form a rotation stopper preventing said nut from slipping when fastening the bus bar.