Electrode Assembly, Secondary Battery Including The Same, Method For Manufacturing The Secondary Battery, and Apparatus For Manufacturing The Secondary Battery

An electrode assembly comprising:

• a plurality of unit cells, each of which comprises an electrode and a separator;
• separator sheets alternately stacked with the plurality of unit cells;
• a first area having a first height;
• a second area having a second height less than the first height so as to define a height difference between the first area and the second area;
• and
• a correction sheet disposed on the second area to correct the height difference.

A method for manufacturing a secondary battery, the method comprising:

• manufacturing a plurality of unit cells, each unit cell including an electrode and a separator, respectively;
• folding the plurality of unit cells and a separator sheet to be alternately stacked with one another to manufacture an electrode assembly;
• correcting a height difference formed on an outer surface of the electrode assembly;
• and
• pressing the electrode assembly,
• wherein the pressing step comprises:
• a first pressing process of pressing the electrode assembly using a first pressing surface;
• and
• a second pressing process of pressing the electrode assembly using a second pressing surface,
• wherein at least one of the first pressing surface the second pressing surface includes a step there along.