Secondary battery
The present invention relates to a secondary battery including: an electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked to each other and wound; an internal insulating tape attached to an inner surface of the electrode, wherein an attachment starting point (a) and an attachment ending point (b) are disposed in a line (A) that is directed to a winding center of the electrode assembly, and the internal insulating tape surrounds a central portion of the electrode assembly once; and an external insulating tape attached to an outer surface of the electrode corresponding to the internal insulating tape, wherein an attachment starting point (c) and an attachment ending point (d) are disposed in a line (B) that is directed to the winding center of the electrode assembly, and the external insulating tape surrounds the central portion of the electrode assembly once.
1. A secondary battery comprising:
an electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked to each other and wound;
an internal insulating tape attached to an inner surface of the electrode, wherein an attachment starting point (a) and an attachment ending point (b) are disposed in a line (A) that is directed to a winding center of the electrode assembly, and the internal insulating tape surrounds a central portion of the electrode assembly once; and
an external insulating tape attached to an outer surface of the electrode corresponding to the internal insulating tape, wherein an attachment starting point (c) and an attachment ending point (d) are disposed in a line (B) that is directed to the winding center of the electrode assembly, and the external insulating tape surrounds the central portion of the electrode assembly once.
2. The secondary battery of claim 1 , wherein the line (A) and the line (B) are disposed to cross each other.
3. The secondary battery of claim 2 , wherein the line (A) and the line (B) are disposed to cross each other by a length of about 1 mm to about 32 mm along a circumference of the electrode to which the internal and external insulating tapes are attached.
4. The secondary battery of claim 1 , wherein the line (A) and the line (B) are disposed to correspond to each other.
5. The secondary battery of claim 1 , wherein the attachment starting point (a) and the attachment ending point (b) of the internal insulating tape do not overlap each other.
6. The secondary battery of claim 1 , wherein the attachment starting point (c) and the attachment ending point (d) of the external insulating tape do not overlap each other.
7. The secondary battery of claim 1 , wherein the attachment starting point (a) of the internal insulating tape is attached farther forward than the attachment starting point (c) of the external insulating tape in a winding direction, and
an end of the internal insulating tape, at which the attachment starting point (a) of the internal insulating tape is defined, and an end of the external insulating tape, at which the attachment ending point (d) of the external insulating tape is defined, overlap each other by a length between the line (A) and the line (B).
8. The secondary battery of claim 1 , wherein the attachment starting point (a) of the internal insulating tape is attached farther backward than the attachment starting point (c) of the external insulating tape in a winding direction, and
an end of the internal insulating tape, at which the attachment ending point (b) of the internal insulating tape is defined, and an end of the external insulating tape, at which the attachment starting point (c) of the external insulating tape is defined, overlap each other by a length between the line (A) and the line (B).
9. The secondary battery of claim 1 , wherein the electrode to which the internal and external insulating tapes are attached is a positive electrode.
10. The secondary battery of claim 1 , wherein an electrode tab is coupled to the inner surface of the electrode to which the internal insulating tape is attached.
11. The secondary battery of claim 1 , wherein the internal insulating tape and the external insulating tape have the same width.