A battery module includes a plurality of unit batteries each having a terminal electrically connected to a terminal base. The battery module further includes at least one connector including at least one protrusion on a side facing the terminal base of the terminal to electrically couple the terminal of one of the plurality of unit batteries with the terminal of a neighboring one of the plurality of unit batteries. The at least one protrusion may include at least one first protrusion and at least one second protrusion. The at least one first protrusion contacts the terminal base of the one of the plurality of unit batteries and the at least one second protrusion contacts the terminal base of the neighboring one of the plurality of unit batteries.