Electrode assembly and lithium secondary battery including the same

An electrode assembly comprising a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer and a negative electrode current collector stacked successively in a thickness direction of the electrode assembly,

• wherein a plurality of through-holes is formed to pass through the positive electrode active material layer, separator and the negative electrode active material layer,
• the positive electrode current collector comprises a first sheet shaped current collector and a plurality of first column shaped current collectors extending from the first sheet shaped current collector along the thickness direction of the electrode assembly and passing through a first group of through-holes of the plurality of through holes, and
• the negative electrode current collector comprises a second sheet shaped current collector and a plurality of second column shaped current collectors extending from the second sheet shaped current collector along the thickness direction of the electrode assembly and passing through a second group of through-holes of the plurality of through holes other than the first group of through-holes.