Secondary battery and manufacturing method thereof
AssigneeLG Chem, Ltd.
InventorSeong Min Kim
Life of this patent
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Abstract
The present invention relates to a secondary battery. The secondary battery comprises an electrode assembly, which comprises: a first electrode in which a first notching part is provided; a second electrode in which a second notching part is provided; a first separator interposed between the first electrode and the second electrode; and a second separator disposed on a lower portion of the second electrode, wherein the electrode assembly is folded in a width direction in a state in which the first electrode, the first separator, the second electrode, and the second separator are sequentially stacked and folded and bent through the first and second notching parts.
Claims13
A secondary battery comprising an electrode assembly, wherein the electrode assembly comprises:
- a first electrode in which a first notching part is provided;
- a second electrode in which a second notching part is provided;
- a first separator interposed between the first electrode and the second electrode;
- and
- a second separator disposed on a lower portion of the second electrode,
- wherein the electrode assembly is in a state in which the first electrode, the first separator, the second electrode, and the second separator are:
- (i) sequentially stacked, (ii) folded in a width direction, and (iii) bent in a longitudinal direction perpendicular to the width direction such that a bending angle is produced only through a combination of individual bends of the first electrode and the second electrode at the locations of each of the first and second notching parts,
- wherein the first or second notching part is lengthily disposed in the width direction of the first or second electrode.
A method for manufacturing a secondary battery, the method comprising:
- a step (a) of processing a plurality of first and second notching parts in a respective surface of first and second electrodes, respectively;
- a step (b) of interposing a first separator between the first electrode and the second electrode and stacking a second separator on a lower portion of the second electrode to manufacture an electrode sheet;
- a step (c) of folding the electrode sheet along a width direction to manufacture an electrode assembly;
- a step (d) of bending the electrode assembly in a longitudinal direction perpendicular to the width direction such that a bending angle is produced only through a combination of individual bends of the first electrode and the second electrode at the locations of each of the plurality of first and second notching parts;
- and
- a step (e) of forming an insulation surrounding the electrode assembly on the outside of the electrode assembly,
- wherein each of the plurality of first and second notching parts is lengthily disposed in the width direction of the first or second electrode.
Dependencies are inferred from the claim text.