Method of manufacturing jelly roll-type electrode assembly and method of manufacturing jelly roll-type polymer secondary battery
There are provided a method of manufacturing a jelly roll-type electrode assembly and a method of manufacturing a secondary battery using the electrode assembly. The method of manufacturing the electrode assembly includes notching a cathode and an anode, elongated in one direction, in a constant size and shape to form a plurality of electrode units, laminating the cathode and the anode with a separator disposed therebetween to form a unit cell, and winding the unit cell by bending the connection units so that the electrode units of the cathode and the anode overlap each other. In the manufacturing of the jelly roll-type electrode assembly and the polymer secondary battery, whose production process can be easily simplified, a jelly roll-type electrode assembly and a polymer secondary battery, both of which exhibit excellent design flexibility, can be manufactured.
1. A method of manufacturing an electrode assembly, comprising:
a notching operation of notching a cathode and an anode, elongated in one direction, in a constant size and shape to form a plurality of electrode units, wherein the electrode units are electrically connected to each other by means of connection units formed at both ends of each of the electrode units;
a laminating operation of laminating the cathode and the anode with a separator disposed therebetween to form a unit cell;
a winding operation of winding the unit cell by bending the connection units so that the electrode units of the cathode and the anode overlap each other;
a separator bonding operation of bonding extra separators, whose shape does not correspond to a shape of the electrode units, after the winding operation, to form a separator-bonded body; and
a cutting operation of cutting the separator-bonded body to form a shape corresponding to the shape of the electrode units.
2. The method of claim 1 , wherein the separator-bonded body is formed by welding the separators.
3. The method of claim 2 , wherein the welding is performed within a temperature of a glass transition temperature (Tg) of the separator ±20° C.
4. The method of claim 1 , wherein the cutting operation is performed by cutting the separators using a knife, a die, scissors, or a laser beam.
5. The method of claim 1 , wherein the connection unit is formed of the same material as a collector plate of the electrode unit.
6. The method of claim 5 , wherein the connection unit is coated with the same electrode active material as the electrode units.
7. A method of manufacturing a secondary battery, comprising packaging the electrode assembly manufactured by the method defined in claim 1 in a cell case.
8. The method of claim 7 , further comprising processing the cell case in a shape corresponding to a shape of the electrode assembly.