Electrode stack structure and battery having electrode stack structure

1. An electrode stack structure comprising:

a plurality of first electrode layers, each first electrode layer having a first polarity;

a plurality of second electrode layers, each second electrode layer having a second polarity, which is different than the first polarity, wherein the first electrode layers and the second electrode layers are alternately disposed; and

a separator, which is disposed between each first electrode layer and second electrode layer,

wherein the first electrode layers and the second electrode layers have multiple tabs

comprising a first tab and a second tab that is spaced apart from the first tab,

wherein the first tabs of the first electrode layers are connected to a first lead, and

wherein the second tabs of the first electrode layers are electrically connected to each other by a first connection unit which is different from the first lead, and

wherein the first tabs of the second electrode layers are connected to a second lead, and

wherein the second tabs of the second electrode layers are electrically connected to each other by a second connection unit which is different from the second lead,

the electrode stack structure further comprising

a first electrode line that electrically connects the first lead with at least one second tab of the first electrode layers and has a width smaller than the width of the first lead, wherein an end of the first electrode line is connected to the first lead and spaced from the first tabs of the first electrode layers; and

a second electrode line that electrically connects the second lead with at least one second tab of the second electrode layers and has a width smaller than the width of the second lead, wherein an end of the second electrode line is connected to the second lead and spaced from the first tabs of the second electrode layers.

2. The electrode stack structure of claim 1 , wherein the first tabs of the first electrode layers and the first tabs of the second electrode layers comprise multiple folds.

3. The electrode stack structure of claim 1 , wherein the first connection unit or the second connection unit each independently comprise an electrically conductive material.

4. The electrode stack structure of claim 1 , wherein the first electrode line, the second electrode line, or both comprise a multiple tab having a fold or a bend.

5. The electrode stack structure of claim 1 , wherein the first electrode line, the second electrode line, or both comprise a multiple-tab having a multiple folds.

6. The electrode stack structure of claim 1 , further comprising a joining unit formed by overlapping the first tabs of the first electrode layers and the first lead, which is disposed between the first tabs of the first electrode layers and the first lead, or

overlapping the first tabs of the second electrode layers and the second lead, which is disposed between the first tabs of the second electrode layers and the second lead.

7. The electrode stack structure of claim 1 ,

wherein the first electrode layers comprise first metal current collectors and a first active material layer which is disposed on a surface of the first metal current collectors, and

wherein the first tabs of the first electrode layers and the second tabs of the first electrode layers protrude from the first metal current collectors, and

wherein the second electrode layers comprise second metal current collectors and a second active material layer which is disposed on a surface of the second metal current collectors, and

wherein the first tabs of the second electrode layers and the second tabs of the second electrode layers protrude from the second metal current collector.

8. The electrode stack structure of claim 1 ,

wherein the first electrode layers comprise first metal current collectors and a first active material layer disposed on a surface of the first metal current collectors,

wherein the first tabs of the first electrode layers protrude from the first metal current collectors,

wherein the second tabs of the first electrode layers are disposed on a region of the metal current collector where the active material layer is not disposed,

wherein the second electrode layers comprise second metal current collectors and a second active material layer disposed on a surface of the second metal current collectors,

wherein the first tabs of the second electrode layers protrude from the second metal current collectors, and

wherein the second tabs of the second electrode layers are disposed on a region of the second metal current collectors where the active material layer is not disposed.

9. A battery comprising the electrode stack structure of claim 1 .

10. A method of manufacturing an electrode stack structure, the method comprising:

stacking a plurality of electrode layers comprising first electrode layers and second electrode layers;

connecting first tabs of first electrode layers to a first lead;

connecting first tabs of second electrode layers to a second lead;

connecting second tabs of the first electrode layers by a first connection unit which is different from the first lead;

connecting second tabs of the second electrode layers by a second connection unit which is different from the second lead;

connecting at least one second tab of the first electrode layers with the first lead by a first electrode line which has a width smaller than the width of the first lead, wherein an end of the first electrode line is connected to the first lead and spaced from the first tabs of the first electrode layers; and

connecting at least one second tab of the second electrode layers with the second lead by a second electrode line which has a width smaller than the width of the second lead, wherein an end of the second electrode line is connected to the second lead and spaced from the first tabs of the second electrode layers, to manufacture the electrode stack structure.