Patent ID: 9577239
Date: 2017-02-21
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A secondary battery comprising an electrode assembly, the electrode assembly comprising: a first electrode comprising a plurality of first electrode tabs extending to a side of the first electrode; a second electrode comprising a plurality of second electrode tabs extending to a side of the second electrode; a first separator between the first electrode and the second electrode and insulating the first electrode and the second electrode from one another; a second separator between the second electrode and the first electrode of a next wrap and insulating the second electrode and the first electrode from one another; and a first electrode lead connected to the plurality of first electrode tabs, wherein the electrode assembly comprises a core separator at a center portion thereof, and the core separator extends along a long axis of the wound electrode assembly and is distinct from the first and second separators, wherein the electrode assembly is in a wound jelly roll shape, wherein the plurality of first electrode tabs are on a first end of the wound electrode assembly in one of quadrants formed by the long axis and a short axis of the first end of the wound electrode assembly, wherein the plurality of second electrode tabs are on the first end of the wound electrode assembly in a different one of the quadrants, and wherein the core separator extends to a side of the first electrode and the second electrode between the plurality of first electrode tabs and the plurality of second electrode tabs in a direction of the short axis.