Patent ID: 8895181

Claim:
A battery module comprising: a casing which comprises an electrode assembly and defines an open upper portion; a cap assembly which is disposed at said upper portion of the casing so as to seal the casing; and a first connection cap which is disposed on the cap assembly and comprises a cap base and a cover; wherein said cap base is fixed to the cap assembly and comprises a rim and an indentation formed on the rim; wherein said cover comprises a side wall extending from the cap base away from the cap assembly; wherein said cover further comprises an opening through the side wall that is enclosed by the side wall; and wherein the rim includes a depressed portion for interconnecting the rim to the cap assembly and wherein the depressed portion is formed in the rim so that the depressed portion is positioned on the rim in front of the opening in the side wall and wherein the indentation in the rim is positioned in the rim so as to be offset from a corner of the opening in the side wall.