Cell structure for secondary battery and secondary battery having the cell structure
A cell structure for a secondary battery includes an electrode assembly including a plurality of electrodes, a plurality of electrode tabs extending from the electrodes to an outside of the electrode assembly, and a plurality of lead tabs electrically connected to the electrode tabs and contacting the electrode assembly. In the cell structure, a part of each of the lead tabs is folded, and the electrode tabs are inserted into the folded part of each of the lead tabs.
1. A cell structure for a secondary battery, the cell structure comprising:
an electrode assembly comprising a plurality of electrodes;
a plurality of electrode tabs extending from the electrodes to an outside of the electrode assembly; and
a plurality of lead tabs electrically connected to the electrode tabs and contacting the electrode assembly,
wherein a part of each of the lead tabs is folded, and
wherein the electrode assembly and the folded part of each of the lead tabs overlap each other when viewed from a plan view in a thickness direction of the electrode assembly.
2. The cell structure for a secondary battery of claim 1 , further comprising:
a fixing unit which fixes the lead tabs to a contact surface of the electrode assembly contacting the lead tabs.
3. The cell structure for a secondary battery of claim 1 , wherein
the electrode tabs are inserted into the folded part of each of the lead tabs.
4. The cell structure for a secondary battery of claim 1 , wherein each of the electrode tabs is folded at least once.
5. The cell structure for a secondary battery of claim 1 , wherein the electrode assembly comprises a flexible material.
6. The cell structure for a secondary battery of claim 1 , further comprising:
an insulation layer disposed on a contact surface of the electrode assembly contacting the lead tabs.
7. The cell structure for a secondary battery of claim 1 , wherein
each of the electrode tabs has a width less than about 50% of a width of the electrode assembly, and
each of the lead tabs has a width equal to or less than about 25% of the width of the electrode assembly.
8. The cell structure for a secondary battery of claim 1 , wherein
the electrodes comprise a first electrode and a second electrode, which are alternately stacked one on another, and
the electrode assembly further comprises a separation film disposed between the first electrode and the second electrode.
9. The cell structure for a secondary battery of claim 8 , wherein
the electrode tabs comprise:
a first electrode tab extending from the first electrode; and
a second electrode tab extending from the second electrode, and
the lead tabs comprise:
a first lead tab electrically connected to the first electrode tab; and
a second lead tab electrically connected to the second electrode tab.
10. The cell structure for a secondary battery of claim 9 , wherein the first lead tab and the second lead tab are in contact with a same surface of the electrode assembly.
11. The cell structure for a secondary battery of claim 9 , wherein the first lead tab and the second lead tab are in contact with different surfaces of the electrode assembly, respectively.
12. The cell structure for a secondary battery of claim 8 , wherein at least one of the first electrode, the second electrode and the separation film is partially bound by a binding member.
13. A secondary battery comprising:
an exterior member; and
a cell structure disposed in the exterior member,
wherein the cell structure comprises:
an electrode assembly comprising a plurality of electrodes;
a plurality of electrode tabs extending from the electrodes to an outside of the electrode assembly; and
a plurality of lead tabs electrically connected to the electrode tabs and contacting the electrode assembly,
wherein a part of each of the lead tabs is folded, and
wherein the electrode assembly and the folded part of each of the lead tabs overlap each other when viewed from a plan view in a thickness direction of the electrode assembly.
14. The secondary battery of claim 13 , further comprising:
a fixing unit which fixes the lead tabs to a contact surface of the electrode assembly contacting the lead tabs.
15. The secondary battery of claim 13 , wherein
the electrode tabs are inserted into the folded part of each of the lead tabs.
16. The secondary battery of claim 13 , wherein each of the electrode tabs is folded at least once.