Cutting device, electrode assembly, cylindrical battery cell, electrode assembly manufacturing device, battery pack and vehicle including the electrode assembly, and battery cell manufacturing method

A cutting device for cutting at least a portion of an uncoated portion of an electrode assembly including an electrode cell body which is wound in a state in which a first electrode sheet and a second electrode sheet, each having a sheet form, and a separator are stacked and which is provided with the uncoated portion not coated with an active material layer, which is provided at an end portion of at least one of the first electrode sheet and the second electrode sheet in a width direction, the cutting device comprising:

• a first cutter configured to form first cutting lines in the uncoated portion, which extends in an axial direction of the electrode assembly, in the axial direction of the electrode assembly while moving in the axial direction of the electrode assembly and separate a cutting-scheduled portion and a forming-scheduled portion based on the first cutting lines;
• and
• a second cutter configured to form second cutting lines in the uncoated portion, which is wound in a circumferential direction of the electrode assembly, in the circumferential direction of the electrode assembly while moving in a radial direction of the electrode assembly and cut away an outer portion of the forming-scheduled portion and the cutting-scheduled portion, which are surrounded by the first cutting lines and the second cutting lines by connecting the second cutting lines to the first cutting lines so that a cut surface is formed in the uncoated portion of the electrode assembly.

A method of manufacturing a battery cell, comprising:

• stacking and winding a first electrode sheet and a second electrode sheet, each having a sheet form, and a separator to manufacture an electrode cell body;
• forming, by a first cutter, first cutting lines in an uncoated portion of one of the first electrode sheet and the second electrode sheet in an axial direction of the electrode cell body while the first cutter moves in the axial direction of the electrode cell body and separating a cutting-scheduled portion and a forming-scheduled portion based on the first cutting lines;
• forming, by a second cutter, second cutting lines in the uncoated portion, which are wound in a circumferential direction of the electrode cell body, in the circumferential direction of the electrode cell body while the second cutter moves in a radial direction of the electrode cell body and cutting away an outer portion of the forming-scheduled portion and the cutting-scheduled portion, which are surrounded by the first cutting lines and the second cutting lines by connecting the second cutting lines to the first cutting lines so that a cut surface is formed in the uncoated portion;
• and
• pressing and flattening, by a press, the forming-scheduled portion of the uncoated portion in a radially outward direction of the electrode cell body to form a forming portion.

An electrode assembly comprising:

• an electrode cell body in which a first electrode sheet and a second electrode sheet, each having a sheet form, are stacked with a separator disposed therebetween, the first electrode sheet, the second electrode sheet, and the separator being wound in a jelly-roll type, uncoated portions not coated with an active material layer are formed at end portions of the first electrode sheet and the second electrode sheet in a width direction;
• a plurality of cut surfaces formed by cutting outer portions of forming-scheduled portions and cutting-scheduled portions of the uncoated portions in a circumferential direction with a core of the electrode cell body as a center;
• and
• a plurality of forming portions disposed between the cut surfaces and formed by pressing and flattening the forming-scheduled portions of the uncoated portions toward an outside of the electrode cell body.