Electrode assembly with tape and electrochemical device comprising the same
View Patent ↗The present disclosure relates to an electrode assembly for preventing a phenomenon of a separator being pressed and/or disconnected from occurring when a free edge electrode is wound into a jelly roll, and an electrochemical device comprising the electrode assembly.
1. An electrode assembly comprising:
an electrode having an electrode active material layer formed on at least one surface of a current collector, the electrode active material layer extending in a first direction to a first peripheral edge and the current collector extending in the first direction to a second peripheral edge, the first and second peripheral edges together forming a free edge of the electrode at a same location, the electrode defining a lower surface;
a separator defining an upper surface that faces and confronts the lower surface of the electrode, the separator extending in the first direction to a third peripheral edge beyond the same location; and
an insulating adhesive tape adhered to the upper surface of the separator and having first and second portions, the first portion including at least half of the insulating adhesive tape and being interposed between the lower surface of the electrode and the upper surface of the separator, the second portion extending in the first direction beyond the free edge of the electrode to a fourth peripheral edge of the insulating adhesive tape, the third peripheral edge of the separator extending in the first direction beyond the fourth peripheral edge of the insulating adhesive tape.
2. The electrode assembly according to claim 1 , wherein the insulating adhesive tape has a width equal to a width of the electrode.
3. The electrode assembly according to claim 1 , wherein the free edge of the electrode corresponds to an edge located at a winding completion portion when the electrode assembly is wound into a jelly roll.
4. The electrode assembly according to claim 1 , wherein the electrode includes either or both of a cathode and an anode.
5. The electrode assembly according to claim 3 , wherein an elastic material is further attached to the edge of the electrode located at the winding completion portion without coming into contact with the separator at the free edge of the electrode.
6. The electrode assembly according to claim 5 , wherein the elastic material is styrene-butadiene rubber.
7. A method of manufacturing the electrode assembly defined in the claim 4 , the method comprising:
stacking the insulating adhesive tape on the separator; and
stacking the electrode on the insulating adhesive tape.
8. The method according to claim 7 , further comprising:
applying an elastic material slurry to an edge of the electrode located at an electrode winding completion portion without the elastic material slurry coming into contact with the separator at the free edge of the electrode.
9. An electrochemical device comprising the electrode assembly according to claim 1 wound into a jelly roll.
10. The electrochemical device according to claim 9 , wherein the electrochemical device is a lithium secondary battery.
11. The electrode assembly according to claim 1 , wherein the first portion of the insulating adhesive tape and the second portion of the insulating adhesive tape are equal in length.
12. The electrode assembly according to claim 1 , wherein the first portion of the insulating adhesive tape is longer than the second portion of the insulating adhesive tape.
13. The electrode assembly according to claim 1 , wherein the insulating adhesive tape has an adhesive layer on one surface thereof, the adhesive layer being adhered to the upper surface of the separator.