Battery, and Battery Pack and Vehicle Including Same

The present disclosure relates to a battery including: an electrode assembly; a battery housing configured to receive the electrode assembly through an opening formed on one side; a battery terminal configured to be electrically connected to the electrode assembly through a closed portion provided on the opposite side of the opening of the battery housing; and a current collector including a first coupling portion configured to be electrically connected to the electrode assembly, a second coupling portion configured to be electrically connected to the battery terminal, and a bridge portion configured to electrically connect the first coupling portion and the second coupling portion to each other, and configured such that at least a portion of an area adjacent to the second coupling portion has a reduced cross-sectional area.