BATTERY, BATTERY PACK, AND VEHICLE INCLUDING SAME

A battery according to the present disclosure may include: an electrode assembly configured by winding a first electrode and a second electrode with a separator interposed therebetween around a central axis of a central winding hole; a cell housing configured to store the electrode assembly and having an opening on one side; and a current collector electrically connected to the electrode assembly and the cell housing, respectively, and having a peripheral portion on its edge, and the peripheral portion may include: one or more contacting peripheral portions that are in contact with the cell housing; and one or more variable peripheral portions configured to be deformable.