Patent ID: 7879478

Claim:
A battery module, comprising: first and second rechargeable batteries, each including a casing for storing an electrode assembly and a cap assembly provided on top of the casing; an interconnector provided between an upper portion of the first rechargeable battery and a lower portion of the second rechargeable battery for connecting the first and second rechargeable batteries to each other; and an insulation cover which covers interconnected portions of the first and second rechargeable batteries, and which has at least one ventilation outlet; wherein the insulation cover includes: a first insulation cover which covers a side face of the first rechargeable battery; and a second insulation cover which covers a side face of the second rechargeable battery, and which is connected to the first insulation cover; and wherein the first insulation cover has an engagement recess formed on a surface of the first insulation cover and the second insulation cover has an engagement protrusion formed in one end of the second insulation cover so that the engagement recess is engaged with the engagement protrusion.