【Technical Field】
[1] This application claims the benefit of priority
to Korean Patent Application No. 2020-0060561 filed on
May 20, 2020, the disclosure of which is incorporated
herein by reference in its entirety.
[2] The present invention relates to an electrode
sheet cutting apparatus including an upper cutter and a
lower cutter and an electrode sheet cutting method using
the same, and more particularly to an electrode sheet
cutting apparatus capable of preventing deformation of a
cut surface of an electrode sheet and removing a material,
such as burr, from the cut surface of the electrode sheet
at the time of cutting the electrode sheet and an
electrode sheet cutting method using the same.
[3]
【Background Art】
[4] In general, a secondary battery includes a
positive electrode and a negative electrode, each of
2
which includes a current collector having an active
material applied to one surface or opposite surfaces
thereof, and a separator. An electrode, such as a
positive electrode or a negative electrode, is formed by
manufacturing an electrode sheet having an electrode
active material applied to one surface or opposite
surfaces thereof and cutting the manufactured electrode
sheet.
[5] FIG. 1 is a schematic view showing a
conventional electrode sheet cutting apparatus and method,
and FIG. 2 is an enlarged view showing the section of an
electrode sheet cut by the conventional electrode sheet
cutting apparatus.
[6] In the conventional electrode sheet cutting
apparatus, as shown in FIG. 1, (i) an electrode sheet 10
is disposed on an electrode sheet support 20 having a
recess formed at a portion at which an electrode sheet
section is provided, and (ii) the electrode sheet 10 is
cut using a cutter 30. At this time, the cutter 30
applies force to the recess in the electrode sheet
support 20 to cut the electrode sheet 10. In the case in
which no recess is provided in the electrode sheet
support 20, the cutter 30 applies force above the section
of the electrode sheet 10 to cut the electrode sheet 10.
[7] In the conventional electrode sheet cutting
3
apparatus, however, an electrode section 11 may be
deformed or a residue, such as burr, is present at the
electrode section 11 when the electrode sheet 10 is cut,
as shown in FIG. 2.
[8] In the case in which a portion of the electrode
sheet 10 is deformed or a residue, such as burr, is
present, as shown in FIG. 2, transfer of the electrode
sheet 10 may be impeded by the deformed portion or the
residue, and when an electrode assembly is formed,
density of the electrode assembly is reduced by the
deformed portion or the residue, whereby capacity of a
battery is reduced. Also, in the case in which a pouchshaped
secondary battery is formed using electrodes, the
electrodes may not be stably stacked, whereby it may not
be possible to form the battery so as to have a desired
shape.
[9] In the drawings of Patent Document 1, cutters
configured to cut an electrode plate are located at
opposite surfaces of a target. However, cutting is
performed from the middle part of the target, and
therefore removal of a residue and deformation of the cut
surface of an electrode sheet are not considered.
[10] Therefore, an electrode sheet cutting apparatus
capable of minimizing a residue due to electrode cutting
while minimizing deformation of an electrode sheet at the
4
time of cutting the electrode sheet and an electrode
sheet cutting method using the same are required.
[11]
[12] (Prior Art Document)
[13] (Patent Document 1) Korean Patent Application
Publication No. 2010-0096018
[14]
【Disclosure】
【Technical Problem】
[15] The present invention has been made in view of
the above problems, and it is an object of the present
invention to provide an electrode sheet cutting apparatus
capable of minimizing deformation of an electrode sheet
and an electrode sheet cutting method using the same.
[16] It is another object of the present invention to
provide an electrode sheet cutting method capable of
minimizing deformation and residue of an electrode sheet
due to cutting of the electrode sheet by defining the
cutting position and sequence of the electrode sheet.
[17]
【Technical Solution】
[18] In order to accomplish the above objects, an
electrode sheet cutting apparatus according to the
5
present invention includes an upper cutter configured to
be located above an electrode sheet, the upper cutter
being configured to cut the electrode sheet; a lower
cutter located so as to correspond to the upper cutter,
the lower cutter being configured to engage the upper
cutter so as to cut the electrode sheet; and an
electrode sheet support located between the upper cutter
and the lower cutter, the electrode sheet support being
configured to support the electrode sheet, the electrode
sheet support being provided with a through hole
configured to correspond to a cutting portion of the
electrode sheet being cut at which the upper cutter and
the lower cutter are configured to engage each other.
[19] Also, the upper cutter and the lower cutter may
be each configured to apply an identical force to the
electrode sheet.
[20] Also, the upper cutter and the lower cutter may
be each configured to move to the electrode sheet at an
identical speed.
[21] Also, the upper cutter and the lower cutter may
be each configured to cut the electrode sheet while
widening a cutting range of the electrode sheet from one
side of the cutting portion.
[22] Also, the cutting portion may be widened from a
portion adjacent to a middle part of the electrode sheet
6
to a contoured portion of the electrode sheet.
[23] The upper cutter and the lower cutter may each
have an identical shape or a symmetrical shape to one
another.
[24] The distance between the upper cutter and the
lower cutter before the electrode sheet is cut may
gradually increase toward one side.
[25] The electrode sheet may be cut to form an
electrode tab protrusion.
[26] At this time, the upper cutter and the lower
cutter may be configured to start cutting the electrode
sheet at a position at which the electrode tab
protrusion is to be formed.
[27] In addition, the present invention provides an
electrode sheet cutting method including (S1) disposing
an electrode sheet on an electrode sheet support having a
through hole formed at a portion at which the electrode
sheet is to be cut; and (S2) cutting the electrode sheet
using an upper cutter and a lower cutter according to any
one of claims 1 to 9.
[28] In step (S2), the electrode sheet may be cut in a
longitudinal direction or a direction perpendicular
thereto to form a single electrode assembly or may be cut
in a concave-convex shape to form an electrode tab.
[29] When the electrode tab is formed in step (S2),
7
the upper cutter and the lower cutter may first cut a
protrusion of the electrode tab and may then cut a place
on the electrode sheet farthest from the protrusion of
the electrode tab in step (S2).
[30] The place on the electrode sheet farthest from
the protrusion of the electrode tab may be another
cutting portion of the electrode sheet.
[31] In the present invention, one or more
constructions that do not conflict with each other may
be selected and combined from among the above
constructions.
[32]
【Description of Drawings】
[33] FIG. 1 is a schematic view showing a
conventional electrode sheet cutting apparatus and method.
[34] FIG. 2 is an enlarged view showing the section
of an electrode cut by the conventional electrode sheet
cutting apparatus.
[35] FIG. 3 is a schematic view showing an electrode
sheet cutting apparatus and method according to the
present invention.
[36] FIG. 4 is a schematic view showing an electrode
sheet cutting apparatus and method according to a first
embodiment of the present invention.
8
[37] FIG. 5 is a schematic view showing another shape
of the upper cutter and the lower cutter of the electrode
sheet cutting apparatus according to the first embodiment.
[38] FIG. 6 is a schematic view showing an upper
cutter and a lower cutter of an electrode sheet cutting
apparatus according to a second embodiment of the
present invention.
[39] FIG. 7 is a schematic view showing the upper
part of an electrode sheet support according to the
present invention.
[40] FIG. 8 is an enlarged view showing the section
of an electrode cut by the electrode sheet cutting
apparatus according to the present invention.
[41] FIG. 9 is a schematic view showing the electrode
sheet cutting apparatus according to the present
invention and an electrode sheet cut thereby.
[42] FIG. 10 is a view showing the result of virtual
simulation of force applied to the electrode sheet by the
electrode sheet cutting apparatus.
[43]
【Best Mode】
[44] In the present application, it should be
understood that the terms “comprises,” “has,” “includes,”
etc. specify the presence of stated features, numbers,
9
steps, operations, elements, components, or combinations
thereof, but do not preclude the presence or addition of
one or more other features, numbers, steps, operations,
elements, components, or combinations thereof.
[45] In addition, the same reference numbers will be
used throughout the drawings to refer to parts that
perform similar functions or operations. In the case in
which one part is said to be connected to another part in
the specification, not only may the one part be directly
connected to the other part, but also, the one part may
be indirectly connected to the other part via a further
part. In addition, that a certain element is included
does not mean that other elements are excluded, but means
that such elements may be further included unless
mentioned otherwise.
[46] Hereinafter, an electrode sheet cutting apparatus
according to the present invention and an electrode sheet
cutting method using the same will be described in detail
with reference to the accompanying drawings.
[47] FIG. 3 is a schematic view showing an electrode
sheet cutting apparatus and method according to the
present invention.
[48] The electrode sheet cutting apparatus according
to the present invention includes an electrode sheet
support 200 configured to support an electrode sheet 100,
10
an upper cutter 300 located above the electrode sheet
100, and a lower cutter 400 located under the electrode
sheet support 200, the lower cutter being disposed at
the position at which the lower cutter engages the upper
cutter 300.
[49] At this time, the electrode sheet support 200 may
be provided with a through hole 210, which is formed in
a cutting portion of the electrode sheet 100 being cut
at which the upper cutter 300 and the lower cutter 400
are configured to engage each other, such that the upper
cutter 300 and the lower cutter 400 engage each other
while cutting the electrode sheet 100.
[50] The upper cutter 300 is connected to an upper
pressing portion 310, and the lower cutter 400 is
connected to a lower pressing portion 410 so as to be
moved at predetermined force and speed. The upper cutter
300 applies upper pressing force F1 above the electrode
sheet 100, and the lower cutter 400 applies lower
pressing force F2 under the electrode sheet 100. The
lower cutter 400 cuts the electrode sheet 100 through the
through hole 210 and engages the upper cutter 300.
[51] The upper pressing force F1 and the lower
pressing force F2 may be equal to each other in order to
prevent deformation of the electrode sheet 100. In the
case in which the force of the upper cutter 300 applied
11
to the electrode sheet 100 and the force of the lower
cutter 400 applied to the electrode sheet 100 are equal
to each other, a danger of the electrode sheet 100 being
deformed upwards or downwards is reduced.
[52] In addition, the upper cutter 300 and the lower
cutter 400 may be spaced apart from the electrode sheet
100 by the same distance and may reach the electrode
sheet at the same speed. As a result, the upper cutter
300 or the lower cutter 400 may be prevented from early
reaching and cutting the electrode sheet 100, whereby it
is possible to inhibit deformation of the electrode sheet
100.
[53] FIG. 4 is a schematic view showing an upper
cutter and a lower cutter of an electrode sheet cutting
apparatus according to a first embodiment of the present
invention, and FIG. 5 is a schematic view showing
another shape of the upper cutter and the lower cutter of
the electrode sheet cutting apparatus according to the
first embodiment.
[54] In the electrode sheet cutting apparatus
according to the first embodiment of the present
invention, the upper cutter 300 and the lower cutter 400
may have the same shape. When viewed from the side,
each of the upper cutter 300 and the lower cutter 400
may have a rectangular shape or a parallelogram shape,
12
as shown in FIG. 4, or each of the upper cutter 300 and
the lower cutter 400 may have a right triangular shape
in which one side of each of the upper cutter 300 and
the lower cutter 400 protrudes more than the other
thereof, as shown in FIG. 5. However, the shape of each
of the upper cutter and the lower cutter is not
restricted as long as it is possible to uniformly cut
the electrode sheet 100.
[55] The inter-cutter distance B between the upper
cutter 300 and the lower cutter 400 before the electrode
sheet 100 is cut may gradually increase from one end to
the other end thereof, as shown in FIG. 4. That is, the
distance at which the upper cutter 300 and the lower
cutter 400 engage each other first may be very short,
and the inter-cutter distance B may gradually increase
in a cutting direction A.
[56] The upper cutter 300 and the lower cutter 400
disposed as described above may cut the electrode sheet
100 while extending a cutting range from one side of the
cutting portion. That is, the upper cutter 300 and the
lower cutter 400 may be operated like a fodder chopper.
As a result, a movement range of each of the upper
cutter 300 and the lower cutter 400 at one corner of the
cutting portion and a movement range of each of the
upper cutter and the lower cutter at the other corner of
13
the cutting portion may be different from each other.
[57] In the case in which the electrode sheet cutting
apparatus according to the present invention performs
cutting while extending a range from one side to the
other side of the cutting portion, as described above,
force applied to the electrode sheet is increased,
whereby cutting is easily performed, and deformation of
the electrode sheet is reduced. In addition, since
cutting is performed while extending the range from one
side to the other side, foreign matter generated due to
cutting moves to the other side.
[58] At this time, in order to easily remove the
foreign matter, it is preferable for the cutting portion
to be widened from a portion adjacent to a middle part
of the electrode sheet 100 to a contour portion of the
electrode sheet, i.e. it is preferable that the upper
cutter 300 and the lower cutter 400 engage each other
first at the middle part of the electrode sheet 100 and
then the cutting portion be widened to the contour
portion of the electrode sheet 100.
[59] In the electrode sheet cutting apparatus
according to the present invention, after the electrode
sheet is cut as the result of being operated like the
fodder chopper, the inter-cutter distance B decreases
until the entire surfaces of the upper cutter 300 and
14
the lower cutter 400 engage each other, as shown in FIG.
4. Subsequently, the entire surfaces of the upper
cutter 300 and the lower cutter 400 engage each other to
cut the cutting portion, and then the upper cutter 300
and the lower cutter 400 move so as to become distant
from the electrode sheet 100.
[60] That is, an electrode sheet cutting method
according to the present invention may mainly include
steps of: (S1) disposing an electrode sheet 100 on an
electrode sheet support 200 having a through hole 210
formed at a portion at which the electrode sheet 100 is
to be cut and (S2) cutting the electrode sheet 100 using
an upper cutter 300 and a lower cutter 400. After step
(S2), a step of removing the upper cutter 300 and the
lower cutter 400 from the electrode sheet 100 after
cutting of the electrode sheet 100 is completed may be
performed.
[61] FIG. 6 is a schematic view showing an upper
cutter and a lower cutter of an electrode sheet cutting
apparatus according to a second embodiment of the
present invention.
[62] The upper cutter 300 and the lower cutter 400 of
the electrode sheet cutting apparatus according to the
second embodiment of the present invention may be
disposed in a symmetrical fashion, whereby the inter15
cutter distance may be the shortest at one corner of
each of the upper cutter 300 and the lower cutter 400
and the inter-cutter distance may be the longest at the
other corner of each of the upper cutter and the lower
cutter. That is, the upper cutter 300 and the lower
cutter 400 may be disposed in a symmetrical fashion
while each of the upper cutter and the lower cutter has
a right triangular shape.
[63] After the upper cutter 300 and the lower cutter
400 come into contact with the electrode sheet 100 first
at one corner of each thereof, the shape or position of
the upper cutter 300 and the lower cutter 400 may be
changed.
[64] As an example, the angle of the upper cutter 300
may be changed while the upper cutter 300 enters the
upper pressing portion 310, to which the upper cutter 300
is connected, and the angle of the lower cutter 400 may
also be changed so as to correspond to the upper cutter
300 while the lower cutter 400 enters the lower pressing
portion 410, to which the lower cutter 400 is connected.
Finally, edges of the upper cutter 300 and the lower
cutter 400 may come into complete contact with each other,
as shown in FIG. 4.
[65] FIG. 7 is a schematic view showing the upper
part of an electrode sheet support according to the
16
present invention.
[66] The electrode sheet support 200 according to the
present invention is provided with a through hole 210
corresponding to a cutting portion at which an electrode
sheet is cut, as shown in FIG. 7. The through hole 210
is an empty hole configured to allow the lower cutter
400 to extend therethrough. The size of the through
hole 210 is set in consideration of the radius of the
lower cutter 400 due to movement or change in angle
thereof. At this time, in order to prevent damage to
the lower cutter 400 due to movement or change in angle
thereof, an electrode sheet damage prevention portion
may be provided in the through hole 210. It is
preferable for the electrode sheet damage prevention
portion to be made of a flexible material in order to
protect the electrode sheet while not damaging the edge
of the lower cutter 400.
[67] FIG. 8 is an enlarged view showing the section
of an electrode sheet cut by the electrode sheet cutting
apparatus according to the present invention.
[68] An electrode section 110 according to the present
invention means the point of the electrode sheet 100 at
which the upper cutter and the lower cutter engage each
other, i.e. the point of the electrode sheet at which the
electrode sheet is cut, as shown in FIG. 8.
17
[69] The electrode section 110 may be divided into an
electrode tab section and an electrode sheet section
depending on the portion that is cut. The cutting
sequence or cutting start region of the electrode sheet
100 may be changed depending on the kind of the electrode
section 110.
[70] FIG. 9 is a schematic view showing the electrode
sheet cutting apparatus according to the present
invention and an electrode sheet cut thereby.
[71] As shown in (i) of FIG. 9, in order to obtain a
plurality of electrode tab portions 120 from a single
electrode sheet 100, the single electrode sheet 100 may
be cut to form the plurality of electrode tab portions
120.
[72] In the case in which the electrode sheet 100 is
manufactured, as described above, the electrode sheet 100
may be cut in a longitudinal direction or a direction
perpendicular thereto in order to form a single electrode
assembly or may be cut in a concave-convex shape in order
to form an electrode tab portion 120 in (S2) the step of
cutting the electrode sheet 100.
[73] When an electrode tab section 111 for electrode
tab cutting is formed, it is preferable to perform
cutting first in an electrode tab protrusion cutting
direction a and then to perform cutting in a direction
18
perpendicular to the protruding direction a of the
electrode tab portion 120, i.e. an electrode tab concave
cutting direction b, which is a direction toward the
electrode sheet 100, in order to minimize deformation of
the electrode sheet 100 and to easily remove foreign
matter generated due to cutting. In addition, it is
preferable to first cut the place at which the electrode
tab portion 120 protrudes, i.e. the place closest to the
electrode tab protrusion, and to last cut the place
farthest from the electrode tab protrusion in the
electrode tab concave cutting direction b. That is, in a
left electrode tab concave cutting direction b-1, which
is one of the electrode tab concave cutting direction b,
it is preferable to perform cutting from the left side to
the right side, since the electrode tab portion 120 is
formed at the left side of the place at which cutting
starts. Also, in a right electrode tab concave cutting
direction b-2, which is the other of the electrode tab
concave cutting direction, it is preferable to perform
cutting from the right side to the left side, since the
electrode tab portion 120 is formed at the right side of
the place at which cutting starts.
[74] The left electrode tab concave cutting direction
b-1 and the right electrode tab concave cutting direction
b-2 engage each other at the place farthest from the
19
place at which the electrode tab portion 120 is formed,
i.e. the center between the electrode tab portions 120.
At this region, the electrode sheet 100 is cut in a
direction perpendicular to the electrode tab concave
cutting direction b to form a unit cell electrode for an
electrode assembly.
[75] To this end, the electrode sheet cutting
apparatus according to the present invention includes an
upper cutter 300, an upper pressing portion 310, a lower
cutter 400, and a lower pressing portion 410, as shown in
(ii) of FIG. 9. When the electrode sheet is cut,
therefore, the upper cutter 300 and the lower cutter 400
are deformed.
[76] At this time, it is preferable for the most
protruding portions of the upper cutter 300 and the lower
cutter 400 to be disposed at the place closest to the
position at which the electrode tab portion 120 is to be
formed depending on the position of the electrode tab
portion 120, and it is preferable for the upper cutter
300 and the lower cutter 400 to be disposed so as to be
most deeply recessed at the electrode sheet section 112
cut to form the unit cell electrode.
[77] FIG. 10 is a view showing the result of virtual
simulation of force applied to the electrode sheet by the
electrode sheet cutting apparatus.
20
[78] Force applied to the electrode sheet by the
electrode sheet cutting apparatus decreases with
increasing contact area between the electrode sheet
cutting apparatus and the electrode sheet.
[79] That is, the conventional electrode sheet cutting
apparatus uniformly contacts the electrode sheet over the
entire area (area = 10), whereby force applied to the
electrode sheet decreases (stress = 0.1), as shown in FIG.
10. In contrast, a portion (area < 10) of the electrode
sheet cutting apparatus according to the present
invention comes into contact with the electrode sheet
first, whereby force applied to the electrode sheet
increases (stress > 0.1), as shown in FIG. 10. As a
result, the electrode sheet is rapidly cut, and
deformation of the electrode sheet is reduced.
[80] Although the specific details of the present
invention have been described in detail, those skilled in
the art will appreciate that the detailed description
thereof discloses only preferred embodiments of the
present invention and thus does not limit the scope of
the present invention. Accordingly, those skilled in the
art will appreciate that various changes and
modifications are possible, without departing from the
category and the technical idea of the present invention,
and it will be obvious that such changes and
21
modifications fall within the scope of the appended
claims.
[81] (Description of Reference Symbols)
[82] 10, 100: Electrode sheets
[83] 11, 110: Electrode sections
[84] 120: Electrode tab portion
[85] 111: Electrode tab section
[86] 112: Electrode sheet section
[87] 200: Electrode sheet support
[88] 210: Through hole
[89] 30: Cutter
[90] 300: Upper cutter
[91] 310: Upper pressing portion
[92] 400: Lower cutter
[93] 410: Lower pressing portion
[94] F1: Upper pressing force
[95] F2: Lower pressing force
[96] A: Cutting direction
[97] B: Inter-cutter distance
[98] a: Electrode tab protrusion cutting direction
[99] b: Electrode tab concave cutting direction
[100] b-1: Left electrode tab concave cutting direction
[101] b-2: Right electrode tab concave cutting
direction
[102]
22
【Industrial Applicability】
[103] An electrode sheet cutting apparatus and an
electrode sheet cutting method according to the present
invention are capable of minimizing deformation of an
electrode sheet. In addition, it is possible to easily
remove foreign matter generated due to cutting of the
electrode sheet such that an electrode is not affected by
the foreign matter.
[104] In addition, it is possible to cut the electrode
sheet so as to have a regular shape, whereby it is
possible to uniformly stack electrodes, and it is
possible to provide a regular shape in the case in which
the electrodes are stacked in a pouch-shaped case.
Furthermore, the electrodes are stacked at a uniform
height, whereby it is possible to improve density and
capacity of the electrode.
[105] In addition, cutting is performed from one side,
whereby a residue generated as the result of electrode
cutting moves to a specific portion, and therefore it is
possible to easily remove the residue.

【Claim 1】 An electrode sheet cutting apparatus
comprising:
an upper cutter configured to be located above an
electrode sheet, the upper cutter being configured to
cut the electrode sheet;
a lower cutter located so as to correspond to the
upper cutter, the lower cutter being configured to
engage the upper cutter so as to cut the electrode sheet;
and
an electrode sheet support located between the
upper cutter and the lower cutter, the electrode sheet
support being configured to support the electrode sheet,
the electrode sheet support being provided with a
through hole configured to correspond to a cutting
portion of the electrode sheet being cut at which the
upper cutter and the lower cutter are configured to
engage each other.
【Claim 2】 The electrode sheet cutting apparatus
according to claim 1, wherein the upper cutter and the
lower cutter are each configured to apply an identical
force to the electrode sheet.
24
【Claim 3】 The electrode sheet cutting apparatus
according to claim 1, wherein the upper cutter and the
lower cutter are each configured to move to the
electrode sheet at an identical speed.
【Claim 4】 The electrode sheet cutting apparatus
according to claim 1, wherein the upper cutter and the
lower cutter are each configured to cut the electrode
sheet while widening a cutting range of the electrode
sheet from one side of the cutting portion.
【Claim 5】 The electrode sheet cutting apparatus
according to claim 4, wherein the cutting portion is
widened from a portion adjacent to a middle part of the
electrode sheet to a contoured portion of the electrode
sheet.
【Claim 6】 The electrode sheet cutting apparatus
according to claim 1, wherein the upper cutter and the
lower cutter each have an identical shape or a
symmetrical shape to one another.
【Claim 7】 The electrode sheet cutting apparatus
according to claim 6, wherein a distance between the
upper cutter and the lower cutter before the electrode
25
sheet is cut gradually increases toward one side.
【Claim 8】 The electrode sheet cutting apparatus
according to claim 1, wherein the electrode sheet is cut
to form an electrode tab protrusion.
【Claim 9】 The electrode sheet cutting apparatus
according to claim 8, wherein the upper cutter and the
lower cutter are configured to start cutting the
electrode sheet at a position at which the electrode tab
protrusion is to be formed.
【Claim 10】 An electrode sheet cutting method
comprising:
(S1) disposing an electrode sheet on an electrode
sheet support having a through hole formed at a portion
at which the electrode sheet is to be cut; and
(S2) cutting the electrode sheet using the upper
cutter and the lower cutter according to any one of
claims 1 to 9.
【Claim 11】 The electrode sheet cutting method
according to claim 10, wherein, in step (S2), the
electrode sheet is cut in a longitudinal direction or a
direction perpendicular thereto to form a single
26
electrode assembly or is cut in a concave-convex shape to
form an electrode tab.
【Claim 12】 The electrode sheet cutting method
according to claim 11, wherein when the electrode tab is
formed in step (S2), the upper cutter and the lower
cutter first cut a protrusion of the electrode tab and
then cut a place on the electrode sheet farthest from the
protrusion of the electrode tab in step (S2).
【Claim 13】 The electrode sheet cutting method
according to claim 12, wherein the place on the electrode
sheet farthest from the protrusion of the electrode tab
is another cutting portion of the electrode sheet.