Electrode Assembly, and Battery Cell and Power Source Including the Same

A secondary battery comprising:

• an electrode assembly comprising a first electrode plate and a second electrode plate, and wound about a winding axis;
• a can accommodating the electrode assembly and having at least one opening formed therein;
• a cap assembly coupled to the can and closing the opening;
• and
• a collector plate electrically connected to the electrode assembly,
• wherein at least one of the first electrode plate or the second electrode plate comprises a plurality of segments bent toward the winding axis and forming one surface of the electrode assembly, and
• the plurality of segments are provided such that at least one bottom angle changes moving away from the winding axis.

A power source comprising:

• at least one battery cell comprising an electrode assembly;
• and
• a housing with the battery cell accommodated therein,
• wherein the electrode assembly comprises,
• a first electrode plate wound about a winding axis and comprising a first uncoated portion without a first electrode active material coated thereon;
• a second electrode plate wound about the winding axis and comprising a second uncoated portion without a second electrode active material coated thereon;
• and
• a plurality of segments formed on at least one of the first uncoated portion or the second uncoated portion,
• wherein the plurality of segments are arranged such that at least one bottom angle is changed in a winding direction.