Electrode cutting device and method

Abstract

The present invention relates to an electrode cutting device and method, and an electrode cutting device according to an embodiment of the present invention includes a cutter that cuts an electrode sheet into unit electrodes, and a first gripper and a second gripper that are located in front of the cutter and fix the electrode sheet from both sides in accordance with the operation of the cutter, wherein the first gripper includes a first region and a second region located on at least one side of the first region, and the first region of the first gripper can protrude toward the second gripper more than the second region.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0022579, filed on February 21, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an electrode cutting device and method, and more particularly to an electrode cutting device and method capable of minimizing the occurrence of positional deviation of an electrode sheet. [Background technology]

[0003] There is an increasing demand for secondary batteries as energy sources for electronic devices such as mobile phones, laptops, and wearable devices, as well as for electric vehicles. Secondary batteries are classified into nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries, lithium secondary batteries, etc. depending on the type of electrode, and research and development into lithium secondary batteries, which have the advantages of high operating voltage and high energy density per unit weight, is being actively conducted.

[0004] In general, a secondary battery may include an electrode assembly and a case in which the electrode assembly is built in. The electrode assembly may have a structure in which a positive electrode and a negative electrode are sequentially stacked with a separator interposed therebetween. Unit electrodes such as positive and negative electrodes may be manufactured by cutting an electrode sheet manufactured by applying an electrode active material to the length of the unit electrode. A gripper that grips the electrode sheet during cutting may come into direct contact with undulations (or wrinkles) of the electrode sheet generated during the roll press process, resulting in a defect of the electrode sheet being misaligned. In addition, a misaligned gripper due to an assembly tolerance of the gripper may strongly press the undulations (or wrinkles) of the electrode sheet, resulting in a defect of the electrode sheet being misaligned severely. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE DISCLOSURE An embodiment of the present invention provides an electrode cutting device and a cutting method that can minimize the occurrence of misalignment of an electrode sheet.

[0006] The technical problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] An electrode cutting device according to one embodiment of the present invention includes a cutter that cuts an electrode sheet into unit electrodes, and a first gripper and a second gripper that are located in front of the cutter and fix the electrode sheet from both sides in accordance with the operation of the cutter, wherein the first gripper includes a first region and a second region located on at least one side of the first region, and the first region of the first gripper can protrude toward the second gripper more than the second region.

[0008] According to one embodiment, the first gripper may apply pressure to an upper surface of the electrode sheet and the second gripper may apply pressure to a lower surface of the electrode sheet.

[0009] According to one embodiment, the electrode sheet includes a central region and a peripheral region located on at least one side of the central region, and the first region of the first gripper can pressurize the central region, excluding at least a portion of the peripheral region of the electrode sheet, in accordance with the operation of the cutter.

[0010] According to one embodiment, the first gripper may be disposed in at least a portion of the first region and may include a protrusion protruding in a direction toward the second gripper.

[0011] According to an embodiment, the height difference between the lower surface of the protrusion and the lower surface of the second region of the first gripper may be 0.4 mm to 0.6 mm.

[0012] According to one embodiment, the length of the protrusion may be shorter than the length of the unit electrode.

[0013] According to one embodiment, the first gripper may be disposed in the second region and may include a concave opening facing away from a direction towards the second gripper.

[0014] According to one embodiment, the difference in height between a bottom surface formed by the opening and a lower surface of the first region of the first gripper may be 4 mm to 6 mm.

[0015] An electrode cutting method according to one embodiment of the present invention includes a step of a first gripper and a second gripper pressing and fixing an electrode sheet from both sides, and a step of a cutter located behind the first gripper and the second gripper cutting the electrode sheet into unit electrodes, wherein the first gripper includes a first region and a second region located on at least one side of the first region, and the first region of the first gripper may protrude toward the second gripper more than the second region.

[0016] According to one embodiment, the electrode sheet includes a central region and a peripheral region located on at least one side of the central region, and the step of fixing the electrode sheet may include a step of pressing the central region of the electrode sheet excluding the peripheral region via a protrusion arranged in the first region of the first gripper. Effect of the Invention

[0017] According to an embodiment of the present invention, since the first gripper applies pressure to the remaining area of ​​the electrode sheet excluding the peripheral area of ​​the electrode sheet, the first gripper can avoid direct contact with the peripheral area of ​​the electrode sheet, thereby preventing the electrode sheet (or unit electrodes) from being misaligned (e.g., displaced) during the lamination process.

[0018] Furthermore, according to an embodiment of the present invention, even if the gripper is misaligned due to assembly tolerance, the gripper can be prevented from coming into direct contact with the peripheral area of ​​the electrode sheet, thereby reducing process defects that may occur due to the misalignment of the gripper.

[0019] In addition, this document may provide a variety of other benefits that may be perceived directly or indirectly. [Brief description of the drawings]

[0020] [Figure 1] 1 is an exploded perspective view showing a secondary battery according to an embodiment of the present invention; [Diagram 2] 1 is a diagram showing a secondary battery manufacturing apparatus according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a cross-sectional view showing a gripper included in the cutting device according to one embodiment of the present invention. [Figure 4a] 5A and 5B are diagrams for explaining the positional relationship between a gripper and an electrode sheet included in the cutting device according to the embodiment of the present invention. [Figure 4b] 5A and 5B are diagrams for explaining the positional relationship between a gripper and an electrode sheet included in the cutting device according to the embodiment of the present invention. [Diagram 5] FIG. 11 is a cross-sectional view showing a gripper included in a cutting device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the present invention. However, the present invention may be realized in various different forms, and is not limited to the following embodiments.

[0022] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention will be omitted, and when referring to components in each drawing in this specification, the same or similar reference symbols will be used for the same or similar components throughout the specification.

[0023] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a limited manner to their ordinary or dictionary meanings, but should be interpreted in a manner that is consistent with the technical ideas of the present invention, based on the principle that the inventors can appropriately define the concepts of terms in order to best describe their invention.

[0024] FIG. 1 is an exploded perspective view showing a secondary battery according to an embodiment of the present invention.

[0025] Referring to FIG. 1, a secondary battery 1 according to an embodiment of the present invention may include an electrode assembly 10 and a case 13 surrounding the electrode assembly 10 .

[0026] The electrode assembly 10 is a power generating element in which a positive electrode and a negative electrode are sequentially stacked with a separator interposed therebetween, and may have a stack type or stack / folding type structure. The separator included in the electrode assembly 10 can insulate the positive electrode and the negative electrode from each other.

[0027] The electrode assembly 10 may include a plurality of electrode tabs 11 extending from the electrode assembly 10. The electrode assembly 10 may include a positive electrode tab 111 and a negative electrode tab 112. The positive electrode tab 111 may extend from a positive electrode of the electrode assembly 10 and protrude outside the electrode assembly 10. The negative electrode tab 112 may extend from a negative electrode of the electrode assembly 10 and protrude outside the electrode assembly 10.

[0028] An electrode lead 12 may be connected to the electrode tab 11. For example, the electrode lead 12 may be connected to the electrode tab 11 by a welding process such as laser welding. The electrode lead 12 may include a positive electrode lead 121 and a negative electrode lead 122. The positive electrode lead 121 and the negative electrode lead 122 may extend in the same direction or in opposite directions depending on the positions where the positive electrode tab 111 and the negative electrode tab 112 are formed. The positive electrode lead 121 and the negative electrode lead 122 may be made of different materials. For example, the positive electrode lead 121 may be made of the same aluminum (Al) material as the positive electrode, and the negative electrode lead 122 may be made of the same copper (Cu) material as the negative electrode, or a copper material coated with nickel (Ni). A portion of the electrode lead 12 protruding outside the case 13 may be a terminal portion and electrically connected to an external terminal.

[0029] A part of the electrode lead 12 may be surrounded by the insulating part 14. The insulating part 14 is located at the seal part 134 where the upper pouch 131 and the lower pouch 132 of the case 13 are heat-sealed, and the electrode lead 12 may be attached to the case 13. This prevents electricity generated from the electrode assembly 10 from flowing to the case 13 via the electrode lead 12, and maintains the seal of the case 13. The insulating part 14 is made of a non-conductive material that does not conduct electricity well. The insulating part 14 may be made of a material that is easily attached to the electrode lead 12 and has a relatively thin thickness. For example, the insulating part 14 may be made of an insulating tape. The material of the insulating part 14 is not limited to insulating tape, and various materials may be used as long as they can insulate the electrode lead 12.

[0030] The case 13 provides a storage space for storing the electrode assembly 10 and has an overall pouch shape. The case 13 can store and seal the electrode assembly 10 such that a portion of the electrode lead 12, i.e., a terminal portion, is exposed. The case 13 includes an upper pouch 131 and a lower pouch 132. The lower pouch 132 is provided with a storage space 133 for storing the electrode assembly 10, and the upper pouch 131 covers the storage space 133 from above so that the electrode assembly 10 does not fall out of the case 13. In this case, the upper pouch 131 may also have a storage space 133 formed therein to store the electrode assembly 10 from above. The upper pouch 131 and the lower pouch 132 may be manufactured by connecting one side to each other, but are not limited thereto, and may be manufactured in various ways, such as being separated from each other and separately manufactured.

[0031] At least one of the positive and negative unit electrodes included in the electrode assembly 10 can be manufactured by coating an active material on a sheet-shaped electrode sheet, drying and rolling it, and then cutting the electrode sheet to a certain size.

[0032] 2 is a diagram showing a secondary battery manufacturing apparatus according to one embodiment of the present invention, which may be an electrode cutting apparatus.

[0033] Referring to FIG. 2, an electrode cutting device according to one embodiment of the present invention can include a gripper 300 and a cutter 200.

[0034] The gripper 300 may be located in front of the cutter 200 based on the direction in which the electrode sheet 100 is supplied. The gripper 300 may grip the electrode sheet 100 so that the electrode sheet 100 can be cut by the cutter 200 in accordance with the operation of the cutter 200. The gripper 300 may be in close contact with both sides of the electrode sheet 100 to restrict the movement of the electrode sheet 100 when the cutter 200 cuts the electrode sheet 100 into unit electrodes. The gripper 300 may include a first gripper 310 and a second gripper 320. The first gripper 310 may contact the upper surface 101 (or the surface facing the first direction (D1)) of the electrode sheet 100 when cutting the electrode sheet 100. The second gripper 320 may contact the lower surface 102 (or the surface facing the second direction (D2)) of the electrode sheet 100 when cutting the electrode sheet 100.

[0035] At least one of the first gripper 310 and the second gripper 320 moves in the up-down direction (or the first direction (D1) and / or the second direction (D2)), thereby applying pressure to the electrode sheet 100. For example, with the second gripper 320 fixed, the first gripper 310 moves in the second direction (D2) toward the second gripper 320, thereby applying pressure to both sides of the electrode sheet 100 via the first and second grippers 310, 320.

[0036] The cutter 200 may be located behind the gripper 300 based on the direction in which the electrode sheet 100 is supplied. The cutter 200 may include a first cutter 210 and a second cutter 220. The first cutter 210 may be disposed to face the upper surface 101 of the electrode sheet 100 with the electrode sheet 100 at the center. The second cutter 220 may be disposed on the lower surface 102 of the electrode sheet 100 with the electrode sheet 100 at the center. At least one of the first cutter 210 and the second cutter 220 may move up and down at a cutting position of the electrode sheet 100. For example, when the electrode sheet 100 is transported, the first cutter 210 moves up and down so that the cutter blade of the first cutter 210 and the cutter blade of the second cutter 220 come into contact with each other, so that the electrode sheet 100 can be cut.

[0037] According to one embodiment, both sides of the electrode sheet 100 can be pressed by gripping (or holding) via the first gripper 310 and the second gripper 320. With both sides of the electrode sheet 100 pressed, the electrode sheet 100 can be cut into unit electrodes via the cutter 200 using the first cutter 210 and the second cutter 220.

[0038] FIG. 3 is a cross-sectional view showing a gripper included in a cutting device according to an embodiment of the present invention.

[0039] Referring to FIG. 3, a gripper 300 included in a cutting device according to an embodiment of the present invention may include a first gripper 310 and a second gripper 320.

[0040] The first gripper 310 may be disposed opposite the second gripper 320 so as to contact the upper surface of the electrode sheet (e.g., the upper surface 101 of the electrode sheet 100 in FIG. 2) when the electrode sheet is cut. The first gripper 310 may include a first region (A1) and a second region (A2) adjacent to the first region (A1). More specifically, the lower surface of the first gripper 310, i.e., the surface facing the second gripper 320, may include the first region (A1) and the second region (A2).

[0041] The second region (A2) may be formed on at least one side of the first region (A1), for example, the second region (A2) may be formed to surround the first region (A1).

[0042] At least a portion of the first region (A1) of the first gripper 310 may protrude in a second direction (D2) toward the second gripper 320 further than the second region (A2). The first gripper 310 may include a protrusion 400 disposed in at least a portion of the first region (A1). The protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 toward the second gripper 320. The protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 in a polygonal shape, or may be formed such that at least a portion of the protrusion has a curvature. For example, the protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 in a rectangular shape.

[0043] The protrusion 400 may be made of the same material as the gripper plate 312 of the first gripper 310, or may be made of another material. For example, the protrusion 400 may be made of the same material as the gripper plate 312 of the first gripper 310. The protrusion 400 made of the same material as the gripper plate 312 may be formed integrally with the gripper plate 312.

[0044] The lower surface of the protrusion 400 (e.g., a surface facing the second direction (D2)) and the upper surface of the second gripper 320 (e.g., a surface facing the first direction (D1)) may be spaced apart by a first separation distance (d1) during the electrode cutting process. The lower surface of the gripper plate 312 disposed in the second region (A2) of the first gripper 310 and the upper surface of the second gripper 320 may be spaced apart by a second separation distance (d2) during the electrode cutting process. The first separation distance (d1) may be different from the second separation distance (d2). The first separation distance (d1) may be formed smaller than the second separation distance (d2). During the electrode cutting process, the first separation distance (d1) has a size corresponding to the thickness of the electrode sheet (e.g., the electrode sheet 100 of FIG. 2), and the second separation distance (d2) may be thicker than the thickness of the electrode sheet.

[0045] A height difference (or step) (s1) between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second region (A2) of the first gripper 310 may correspond to the thickness of the protrusion 400. The height difference (s1) between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second region (A2) of the first gripper 310 may be set in consideration of the thickness of the peripheral region of the electrode sheet. For example, the height difference (s1) between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second region (A2) of the first gripper 310 may be 0.4 mm to 0.6 mm.

[0046] The protrusion 400 may contact a portion of the electrode sheet fixed between the first gripper 310 and the second gripper 320 during a cutting process of the electrode sheet. The electrode sheet may include a central region and a peripheral region located on at least one side of the central region. The central region of the electrode sheet may be surrounded by the peripheral region of the electrode sheet.

[0047] The first region (A1) of the first gripper 310 in which the protrusion 400 is arranged may pressurize the central region of the electrode sheet excluding the peripheral region in accordance with the operation of a cutter (e.g., cutter 200 in FIG. 2). The protrusion 400 may not contact the peripheral region of the electrode sheet, but may contact the central region of the electrode sheet. The size of the protrusion 400 may be smaller than the size of the unit electrode and / or the gripper plate 312 cut by the cutter. The length (L1) of the protrusion 400 may be formed to be smaller than the length of the unit electrode. As an example, the length (L1) of the protrusion 400 may be formed to be about half the length of the unit electrode.

[0048] In this manner, the lower surface of the protrusion 400 disposed in the first region (A1) of the first gripper 310 can come into contact with the electrode sheet during the electrode cutting process. The gripper plate 312 disposed in the second region (A2) of the first gripper 310 does not need to come into contact with the electrode sheet during the electrode cutting process.

[0049] 4a and 4b are diagrams for explaining the positional relationship between a gripper and an electrode sheet included in a cutting device according to an embodiment of the present invention.

[0050] 4a and 4b, the electrode sheet 100 may include a central region 110 and a peripheral region 120. At least a portion of the central region 110 of the electrode sheet 100 may correspond to a first region (A1) of the first gripper 310. At least a portion of the peripheral region 120 of the electrode sheet 100 may correspond to a second region (A2) of the first gripper 310. The surface of the central region 110 of the electrode sheet 100 may be formed uniformly. The surface of the peripheral region 120 of the electrode sheet 100 may be formed to be more non-uniform than that of the central region 110 of the electrode sheet 100. The peripheral region 120 of the electrode sheet 100 may have undulations (or wrinkles) in a process prior to the cutting process (e.g., a roll press process of the electrode), so that the surface of the peripheral region 120 of the electrode sheet 100 may become non-uniform.

[0051] During the cutting process of the electrode sheet 100, the protrusion 400 of the first gripper 310 can press the electrode sheet 100. The protrusion 400 of the first gripper 310 can press the central region 110 of the electrode sheet 100. The protrusion 400 of the first gripper 310 can be formed to avoid the peripheral region 120 of the electrode sheet 100 where undulations are likely to occur. The protrusion 400 of the first gripper 310 may not press the peripheral region 120 of the electrode sheet 100. The second region (A2) of the first gripper 310 may not press the peripheral region 120 of the electrode sheet 100. In this way, the first gripper 310 can grip a part of the area (excluding the peripheral region 120) of the upper surface of the electrode sheet 100, rather than the entire area. As a result, the present invention can prevent the electrode sheet (or unit electrode) from being misaligned (for example, misaligned) during the lamination process.

[0052] 4b, misalignment may occur in at least one of the first gripper 310 and the second gripper 320 due to assembly tolerance. Even if misalignment occurs in the first gripper 310 due to assembly tolerance, the first gripper 310 does not need to contact (or apply pressure to) the peripheral region 120 of the electrode sheet 100 where waviness is likely to occur. As a result, the present invention can prevent positional errors (e.g., misalignment) of the electrode sheet (or unit electrodes) during the lamination process.

[0053] Fig. 5 is a cross-sectional view showing a gripper included in a cutting device according to another embodiment of the present invention. The gripper shown in Fig. 5 may be substantially similar to the gripper 300 shown in Figs. 3 to 4b, except that an opening 500 is provided in the first gripper 310 instead of the protrusion 400 of the first gripper shown in Figs. 3 to 4b. The description of the remaining configuration except for the opening 500 of the first gripper 310 can be applied mutatis mutandis to the description of Figs. 3 to 4b, and therefore duplicated description will be omitted.

[0054] 5 may protrude further in a second direction (D2) toward the second gripper 320 than the second region (A2). The first gripper 310 may include an opening 500 disposed in at least a portion of the second region (A2).

[0055] The lower surface of the gripper plate 312 disposed in the first region (A1) of the first gripper 310 and the upper surface of the second gripper 320 (e.g., the surface facing the first direction (D1)) may be spaced apart by a first separation distance (d1) during the electrode cutting process. The bottom surface 501 formed by the opening 500 and the upper surface of the second gripper 320 may be spaced apart by a second separation distance (d2) during the electrode cutting process. The first separation distance (d1) may be different from the second separation distance (d2). The first separation distance (d1) may be formed smaller than the second separation distance (d2). During the electrode cutting process, the first separation distance (d1) has a size corresponding to the thickness of the electrode sheet (e.g., the electrode sheet 100 of FIG. 2), and the second separation distance (d2) may be thicker than the thickness of the electrode sheet.

[0056] A height difference (or step) (s2) between the bottom surface 501 formed by the opening 500 and the gripper plate 312 disposed in the first region (A1) of the first gripper 310 may correspond to the depth of the opening 500. The height difference (s2) between the bottom surface 501 of the opening 500 and the gripper plate 312 disposed in the first region (A1) of the first gripper 310 may be set in consideration of the thickness of the peripheral region of the electrode sheet. For example, the height difference (s2) between the bottom surface 501 formed by the opening 500 and the gripper plate 312 disposed in the first region (A1) of the first gripper 310 may be 0.4 mm to 0.6 mm.

[0057] The gripper plate 312 of the first gripper 310 can contact a portion of the electrode sheet fixed between the first gripper 310 and the second gripper 320 during the cutting process of the electrode sheet. The first gripper 310 can pressurize a central region of the electrode sheet excluding the peripheral region in accordance with the operation of a cutter (e.g., the cutter 200 in FIG. 2). The opening 500 allows the first gripper 310 to contact the central region of the electrode sheet without contacting the peripheral region of the electrode sheet.

[0058] The size of the gripper plate 312 in the first region (A1) protruding from the bottom surface 501 formed by the opening 500 toward the second gripper 320 may be smaller than the size of the unit electrode and / or gripper plate 312 cut by the cutter. The length (L2) of the gripper plate 312 in the first region (A1) protruding from the bottom surface 501 formed by the opening 500 may be formed to be smaller than the length of the unit electrode. As an example, the length (L2) of the gripper plate 312 in the first region (A1) protruding from the bottom surface 501 formed by the opening 500 may be formed to be about half the length of the unit electrode.

[0059] The lower surface of the gripper plate 312 arranged in the first region (A1) of the first gripper 310 can come into contact with the electrode sheet during the electrode cutting step. The gripper plate 312 arranged in the second region (A2) of the first gripper 310 does not need to come into contact with at least a portion of the electrode sheet during the electrode cutting step due to the opening 500. The gripper plate 312 arranged in the second region (A2) of the first gripper 310 does not need to come into contact with (or apply pressure to) the peripheral region 120 of the electrode sheet 100 where undulations are likely to occur.

[0060] In this way, the first gripper 310 can grip a partial region (a region excluding the peripheral region 120) rather than the entire area of ​​the upper surface of the electrode sheet 100. As a result, the present invention can prevent positional errors (e.g., misalignment) of the electrode sheet (or unit electrodes) during the lamination process.

[0061] According to an embodiment, in a portion of the second region (A2) of the first gripper 310, the thickness of the gripper plate 312 may be formed thinner than the thickness of the gripper plate 312 disposed in the first region (A1) as shown in FIG. 5. The opening 500 may be formed in a groove shape from the lower surface (e.g., the surface facing the second direction (D2)) of the gripper plate 312 to the upper surface (e.g., the surface facing the first direction (D1)) of the gripper plate 312 as shown in FIG. 5. In the remaining portion of the second region (A2) of the first gripper 310, the thickness of the gripper plate 312 may be the same as the thickness of the gripper plate 312 in the first region (A1). In this case, the gripper plate 312 may contact a portion of the peripheral region 120 of the electrode sheet 100 where undulation is likely to occur, but the opening 500 may minimize the contact area between the gripper plate 312 and the electrode sheet. This can minimize positional errors (eg, misalignment) of the electrode sheet (or unit electrode) during the lamination process.

[0062] According to another embodiment, the opening 500 may be formed such that the thickness of the gripper plate 312 in the entire second region (A2) of the first gripper 310 is thinner than the thickness of the gripper plate 312 disposed in the first region (A1). In this case, the gripper plate 312 does not need to contact the entire peripheral region of the electrode sheet 100 where undulations are likely to occur. This can prevent the electrode sheet (or unit electrode) from being misaligned (e.g., dislocation) during the lamination process.

[0063] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical concept of the present invention and the scope of the claims described below by a person having ordinary knowledge in the technical field to which the present invention belongs. [Explanation of symbols]

[0064] 1: Secondary battery 10: Electrode assembly 100: Electrode sheet 200: Cutter 300: Gripper 400: Protrusion 500:Opening

Claims

1. a cutter for cutting the electrode sheet into unit electrodes; a first gripper and a second gripper positioned in front of the cutter and configured to fix the electrode sheet from both sides in accordance with the operation of the cutter; Including, The first gripper includes a first region and a second region located on at least one side of the first region, An electrode cutting device, wherein the first region of the first gripper protrudes toward the second gripper more than the second region.

2. The first gripper applies pressure to an upper surface of the electrode sheet, The electrode cutting device according to claim 1 , wherein the second gripper applies pressure to a lower surface of the electrode sheet.

3. the electrode sheet includes a central region and a peripheral region located on at least one side of the central region; The electrode cutting device according to claim 1 , wherein the first region of the first gripper presses the central region of the electrode sheet excluding at least a portion of the peripheral region in accordance with the operation of the cutter.

4. The first gripper is The electrode cutting device according to any one of claims 1 to 3, further comprising a protrusion disposed in at least a portion of the first region and protruding in a direction toward the second gripper.

5. 5. The electrode cutting device according to claim 4, wherein a difference in height between a lower surface of the projection and a lower surface of the second region of the first gripper is 0.4 mm to 0.6 mm.

6. The electrode cutting device according to claim 4 , wherein a length of the projection is shorter than a length of the unit electrode.

7. The first gripper is The electrode cutting device according to any one of claims 1 to 3, further comprising an opening disposed in at least a portion of the second region and recessed in a direction opposite to a direction toward the second gripper.

8. 8. The electrode cutting device according to claim 7, wherein a difference in height between a bottom surface formed by the opening and a lower surface of the first region of the first gripper is 4 mm to 6 mm.

9. A step of pressing and fixing the electrode sheet from both sides by the first gripper and the second gripper; a cutter positioned behind the first gripper and the second gripper cutting the electrode sheet into unit electrodes; Including, The first gripper includes a first region and a second region located on at least one side of the first region, The electrode cutting method, wherein the first region of the first gripper protrudes toward the second gripper more than the second region.

10. the electrode sheet includes a central region and a peripheral region located on at least one side of the central region; The step of fixing the electrode sheet includes: The electrode cutting method according to claim 9 , further comprising the step of applying pressure to the central region of the electrode sheet excluding the peripheral region via a protrusion disposed in the first region of the first gripper.

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