BATTERY AND METHOD OF MANUFACTURING SAME

A battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode and wound together; a case to accommodate the electrode assembly, and including a bottom portion, a sidewall portion connected to the bottom portion, and an opening at a side opposite to the bottom portion; and a cap assembly to seal the opening by being connected to one end of the sidewall portion of the case. A substrate of the second electrode extends and is wound to surround an outer circumference of the electrode assembly, and at least a portion of the outer circumference of the electrode assembly contacts the sidewall portion of the case.