Electrode assembly and lithium secondary battery using the same
An electrode assembly and a lithium secondary battery including the same. Heat generation of the electrode tabs is reduced by providing the electrode tabs at the outermost parts of the electrode assembly. An insulation member is attached at the boundary of the electrode tabs and the respective electrode plates. An insulation member is also attached to the uncoated portions formed on the outer circumference of the electrode assembly, thereby preventing internal short circuits either between an uncoated portion and an active material layer or between the uncoated portions. The electrode assembly can be used in pouch, rectangular and cylindrical lithium secondary batteries to prevent an internal short circuit within the batteries.
1. An electrode assembly, comprising:
a first electrode plate having uncoated portions on each of a rear end and a front end of a collector where the collector is not coated with active material;
a second electrode plate having uncoated portions on each of a rear end and a front end of a collector where the collector is not coated with active material;
a separator interposed between the first and second electrode plates, wherein the first electrode, the separator, and the second electrode are wound around a central axis as a jelly-roll;
a first electrode tab formed on an outer surface of the first electrode plate at an outermost portion of the jelly-roll with respect to the central axis;
a second electrode tab formed on the second electrode plate at an outermost portion of the jelly-roll with respect to the central axis; and
an insulation member attached to an inner surface of the uncoated portion of the first electrode plate that faces the separator, wherein a first end of the insulating member extends over a portion of the active material and a second end of the insulating member extends to the end of the uncoated portion of the first electrode plate.
2. The electrode assembly of claim 1 , wherein the first and second electrode tabs are respectively provided at an uncoated portions of the first and second electrode plates.
3. The electrode assembly of claim 1 , wherein the insulation member is an insulation tape, and wherein each of the first electrode tab and the second electrode tab are covered by a protective tape.
4. The electrode assembly of claim 1 , wherein the insulation member comprises a laminating tape attached to a boundary between an active material layer and the uncoated portion of the first electrode plate, wherein the laminating tape extends beyond the first electrode tab.
5. The electrode assembly of claim 1 , wherein the first electrode plate is a cathode plate.
6. The electrode assembly of claim 1 , wherein the second electrode plate is an anode plate.