Method of manufacturing electrode plate for secondary battery and electrode plate for secondary battery

Abstract

The present technology relates to a method of manufacturing an electrode plate of a secondary battery and an electrode plate of a secondary battery manufactured by the above method, and the method is a method of manufacturing an electrode plate by pattern coating on an electrode current collector sheet to have a coated portion on which an electrode slurry is coated and an uncoated portion on which the electrode slurry is not coated, including: attaching at least one adhesive film on at least a part of the uncoated portion on the electrode current collector sheet; continuously coating the electrode slurry on the electrode current collector sheet including the adhesive film attachment portion; heating and drying the electrode slurry; and peeling the adhesive film from the electrode current collector sheet and recycling the adhesive film. Here, during recycling of the adhesive film, when the adhesion of the adhesive film is reduced in the heating and drying process of the electrode slurry, the adhesive film becomes peelable from the electrode current collector sheet, and as the adhesive film is peeled, the surface of the electrode current collector sheet is exposed.

Description

TECHNICAL FIELD

[0001] The present application relates to a method of manufacturing an electrode plate for a secondary battery.

[0002] The present application also relates to an electrode plate for a secondary battery manufactured by the method of manufacturing an electrode plate.

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0139040, filed on October 26, 2020, the entire contents of which are incorporated herein by reference. BACKGROUND

[0004] As technology development and demand for mobile devices increase, demand for secondary batteries also rapidly increases. Among them, lithium secondary batteries are widely used as energy sources for various electronic products and various mobile devices due to their high energy density and high operating voltage, as well as excellent storage and lifespan characteristics.

[0005] An electrode assembly for charging and discharging electric energy in a case is built in a lithium secondary battery. Electrodes (positive and negative) constituting the electrode assembly generate electric current through ion exchange, each of the positive and negative electrodes is made into an electrode substrate by applying an electrode slurry on a surface of a current collector made of an aluminum or copper film and drying the electrode slurry, tab processing is performed, and the electrode substrate is cut to an appropriate size. The electrode slurry is applied on the surface of the current collector in a form in which a solvent is mixed with an active material, and the electrode substrate is made. The electrode substrate is dried by evaporating the solvent of the electrode slurry to harden the electrode active material on the surface of the current collector.

[0006] Figure 1 is a schematic view of a heating and drying device for drying an electrode substrate.

[0007] As Figure 1 shown, in a process in which a current collector sheet 2a is unwound from an unwinding roll 1a and then wound on a winding roll 1b, an electrode substrate 2 obtained by applying an electrode slurry on a surface of the current collector sheet 2a by a coating machine 7 is heated and dried by a roll 6 through an electrode oven 4, and then the electrode substrate 2 is wound on the winding roll 1b. The electrode oven 4 has one or more drying chambers 4a, 4b, and 4c, and the temperature of each drying chamber is controlled by heat generated in a heater 5.

[0008] Figure 2 Sequential patterns of an electrode current collector sheet are shown.

[0009] A portion (coated portion 10) on which the electrode slurry is coated and a portion (uncoated portion 20) on which the electrode slurry is not coated are alternately arranged on the electrode current collector sheet 100.

[0010] The uncoated portion 20 is formed because the exposed surface of the electrode current collector sheet (metal) needs to be formed with terminals for connecting the positive electrode to the negative electrode during the subsequent formation of the electrode assembly. A tab can be formed on the uncoated portion 20 through a subsequent cutting process, etc.

[0011] In conventional techniques, to form such electrode patterns, intermittent or discontinuous coating operations are performed, in which the start and stop of electrode slurry discharge are repeated while the coating machine or current collector moves according to the pattern of the coated section 10 or the uncoated section 20. When the coating speed is relatively slow, the pattern can be formed to a certain extent accurately through this discontinuous coating operation, but the production efficiency may be reduced due to the significantly slower operating speed.

[0012] Furthermore, as the coating speed increases, it becomes difficult to synchronize the mechanical control of the coating head with the coating speed, making it difficult to form a pattern of alternating uncoated and coated areas.

[0013] Furthermore, in traditional electrode plates, such as Figure 2 As shown, the uncoated portions 20 formed between the coated portions 10 are formed along the width direction of the electrode plate. Since no electrode paste is applied to the uncoated portions 20, the uncoated portions 20 do not contribute to the improvement of battery capacity or energy density.

[0014] Therefore, there is a need for a technology that can increase battery capacity and other properties while improving the coating speed of electrode patterns.

[0015] [Existing Technical Documents]

[0016] [Patent Literature]

[0017] Korean Patent Publication No. 10-2015-0049516 Summary of the Invention

[0018] [Technical Issues]

[0019] It is believed that the present invention solves at least some of the above-mentioned problems. For example, one aspect of the present invention provides a method for manufacturing an electrode plate for a secondary battery, which can increase the coating speed by continuously coating an electrode slurry onto an electrode current collector sheet.

[0020] Furthermore, another aspect of the present invention provides a method for manufacturing an electrode plate for a secondary battery, which can effectively form an electrode pattern on the electrode by simply peeling off the uncoated portion on the electrode current collector.

[0021] Furthermore, another aspect of the present invention provides a method for manufacturing an electrode plate for a secondary battery, which can improve battery capacity and energy density by expanding the electrode slurry coating area.

[0022] Furthermore, the present invention relates to an electrode plate for a secondary battery manufactured by the above method, which can improve battery capacity and energy density.

[0023] [Technical Solution]

[0024] The present invention, aimed at solving the aforementioned problems, describes a method for manufacturing an electrode plate for a secondary battery. This method involves patterning an electrode current collector sheet to form a coated portion having electrode paste coated on a coated portion and an uncoated portion having no electrode paste coated on an uncoated portion. The method includes: attaching at least one adhesive film to at least a portion of the uncoated portion of the electrode current collector sheet; continuously coating the electrode current collector sheet, including the adhesive film attachment portion, with electrode paste; heating and drying the electrode paste; and peeling the adhesive film off the electrode current collector sheet and recovering the adhesive film. Here, heating and drying the electrode paste reduces the adhesive film's adhesion, allowing the adhesive film to be removed from the electrode current collector sheet during peeling and recovery, thus exposing the surface of the electrode current collector sheet.

[0025] Specifically, during the heating and drying process of the electrode slurry, heating reduces the adhesion of the adhesive film.

[0026] In one example, the adhesive film includes fillers that expand in volume when heated.

[0027] The filler can expand at a temperature of 80°C or higher, and preferably at a temperature between 100°C and 200°C.

[0028] The adhesive film can be peeled off from the surface of the electrode current collector sheet by adsorption.

[0029] In one example of the present invention, the adhesive film can be peeled off by using a vacuum adsorption device to vacuum adsorb the adhesive film.

[0030] In another example of the invention, the adhesive film can be peeled off by adsorbing it onto an adhesive roller with tape attached to its outer periphery.

[0031] Preferably, the adhesive film can be peeled off by adsorbing the electrode current collector sheet while moving along the upper surface of the electrode current collector sheet.

[0032] After removing the adhesive film, the surface of the electrode current collector sheet can be flattened.

[0033] In addition, the pattern on the electrode current collector sheet can be adjusted by adjusting at least one of the quantity, size and shape of the adhesive film, and the attachment position of the adhesive film.

[0034] Furthermore, in another aspect of the invention, an electrode plate for a secondary battery can be provided by the above method. In one example, the electrode plate includes an electrode current collector sheet, the electrode current collector sheet including at least one coated portion on a coated portion coated with electrode paste and at least one uncoated portion on an uncoated portion not coated with electrode paste. Here, the uncoated portions are positioned at regular intervals along the longitudinal direction of the electrode current collector sheet, the uncoated portions are formed to be spaced apart from each other along the width direction of the electrode current collector sheet, and the coated portions are formed at least on the portions other than the uncoated portions.

[0035] [Beneficial Effects]

[0036] According to the present invention, the coating speed of electrode paste can be significantly improved by continuously forming electrode patterns.

[0037] Furthermore, according to the present invention, by forming uncoated portions only at desired locations on the electrode current collector, the electrode slurry coating portion is expanded, thereby increasing battery capacity and energy density.

[0038] Furthermore, according to the present invention, it is advantageous to be able to continuously peel off the adhesive film used to form an uncoated pattern on the electrode current collector while moving along the surface of the electrode current collector sheet. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a heating and drying apparatus used for drying electrode substrates.

[0040] Figure 2 This is a schematic diagram illustrating a conventional method for forming discontinuous patterns on electrode current collector sheets.

[0041] Figure 3 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram illustrating the structure of the adhesive film used in this invention.

[0043] Figure 5 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to another embodiment of the present invention.

[0044] Figure 6 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to yet another embodiment of the present invention. Detailed Implementation

[0045] The detailed configuration of the present invention will be described below with reference to the accompanying drawings and various embodiments. The embodiments described below are exemplary to aid in understanding the present invention, and for the purpose of aiding in understanding the present invention, the drawings are not shown to scale, and the dimensions of some components may be exaggerated.

[0046] Because the concept of the present invention allows for various changes and numerous embodiments, specific embodiments will be shown in the accompanying drawings and described in detail herein. However, this is not intended to limit the invention to the specific forms disclosed, and it should be understood to include all variations, equivalents, and substitutions contained within the spirit and scope of the invention.

[0047] This invention aims to improve upon traditional discontinuous pattern coating techniques (see...). Figure 2 This technology forms a coated section by applying electrode slurry discharged from a coating machine to the coated section during the movement of the electrode current collector sheet, and by stopping the discharge of the electrode slurry, an uncoated section without electrode slurry is formed.

[0048] The main feature of this invention is that, in order to continuously coat discontinuous patterns, an adhesive film is attached to the portion where the uncoated portion is to be formed.

[0049] Furthermore, the electrode slurry is continuously coated onto the electrode current collector sheet, including the adhesive film attachment portion. Thus, the electrode slurry is applied over the adhesive film. It is important whether the adhesive film with the applied electrode slurry can be effectively peeled off and recycled. When the peeling and recycling process of the adhesive film becomes difficult, uncoated portions cannot be properly formed. Therefore, the technical significance of converting discontinuous coating to continuous coating is significantly reduced. The present invention employs a means to naturally reduce the adhesive strength of the adhesive film through a heating and drying process of the electrode slurry, thereby making the adhesive film easier to peel off. That is, a separate heating or cooling process after the heating and drying process of the electrode slurry will not reduce the adhesive strength of the adhesive film, but the adhesive strength of the adhesive film can be reduced by the high-temperature heating applied during the heating and drying process of the electrode slurry. Therefore, according to the present invention, Figure 1 The continuous coating process – including the heating and drying process – remains undisturbed. Therefore, the method of this invention is more suitable for equipment automation and further improves production efficiency.

[0050] Therefore, the present invention uses a specific adhesive film that reduces adhesion by heating.

[0051] (First Implementation)

[0052] Figure 3 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to a first embodiment of the present invention.

[0053] exist Figure 3In the process, the electrode current collector sheet 100 moves from left to right, and the electrode current collector sheet 100 continuously undergoes a series of processes while moving from left to right.

[0054] First, in the manufacturing method according to this embodiment, an adhesive film 21 is attached to the portion of the electrode current collector sheet 100 where an uncoated portion is to be formed. The attachment of the adhesive film 21 is performed before the application of the electrode paste, and the attachment method is not particularly limited. Preferably, the adhesive film 21 can be automatically positioned and attached by a robot that stores information about the location of the uncoated portion to be formed. Unlike conventional uncoated portions formed in a strip between coated portions 10, in this invention, the uncoated portions 20 are formed at specific locations with dot-like intervals. This is achieved by using the specific adhesive film and peeling method of this invention.

[0055] After the adhesive film 21 is applied, electrode paste is continuously applied to the electrode current collector sheet 100, including the portion with the adhesive film already applied. Figure 3 The rectangle indicated by the dashed line shows the adhesive film on which the electrode paste has been applied. Thus, when the electrode paste is applied continuously along its designed width, electrode paste coated portions 11 are formed on the electrode current collector sheet 100, excluding the uncoated portions at both ends of the electrode current collector sheet 100 in the width direction. Since the electrode paste is applied continuously regardless of whether the adhesive film 21 is attached, it is not necessary to stop the coating machine discharge as in the prior art.

[0056] Subsequently, as the electrode current collector sheet 100 is heated in the drying apparatus 200, the electrode paste on the electrode current collector sheet 100 is dried. During this heating and drying process, the adhesion of the adhesive film 21 under the electrode paste decreases. That is, in this invention, the drying of the electrode paste and the reduction of the adhesion of the adhesive film 21 are carried out simultaneously during the drying process of the drying apparatus 200. Therefore, since the adhesion of the adhesive film 21 on the electrode current collector sheet 100 passing through the drying apparatus 200 is reduced, the adhesive film is in a state that is easy to peel off. By peeling off the adhesive film 21, the surface of the electrode current collector sheet 100 is exposed, and this portion becomes the uncoated portion 20.

[0057] The adhesive strength of the adhesive film 21 of the present invention decreases during the heat drying process. In this embodiment, the adhesive strength of the adhesive film decreases due to the heat generated during the heat drying process.

[0058] <Mechanism of Adhesion Reduction>

[0059] Figure 4 This is a schematic diagram showing the structure of the adhesive film 21 used in this invention. Figure 4An example of an adhesive film 21 is shown, wherein the adhesion is reduced due to heat during the heating and drying process. As shown, the adhesive film 21 includes an adhesive 21a, a filler 21b, and a sheet 21c to which the adhesive 21a and the filler 21b are attached. When heat is applied, the filler 21b expands. Consequently, most of the adhesion area to the surface of the electrode current collector sheet 100 is occupied by the filler 21b, the adhesion area on the sheet surface is significantly reduced, and the adhesive film 21 becomes peelable.

[0060] Adhesive 21a can be manufactured using known adhesive compositions without interfering with the function of filler 21b. For example, an acrylic adhesive obtained by mixing flexible acrylate monomers and hard acrylate monomers in a predetermined ratio can be used. A photoinitiator or photocrosslinker can be added to the adhesive if necessary. Curable or thermoplastic products are preferably used as filler 21b. For example, AkzoNobel's Polymeric Sphere Expancel 551DU (product name) can be used. The composition of filler 21b and adhesive 21a, the diameter of filler 21b, etc., can be appropriately selected considering the reduction in adhesion during subsequent filler expansion. Preferably, the diameter of filler 21b is between 6 micrometers and 24 micrometers.

[0061] A filler having the property of expanding during the heating and drying process of the electrode slurry can be used as filler 21b. Therefore, filler 21b expands at a temperature of 80°C or higher. Filler 21b preferably expands within a general heating and drying temperature range of 100°C to 200°C. The aforementioned product filler 21b meets these conditions.

[0062] <Stripping Mechanism>

[0063] Reference Figure 3 The adhesive film peeling and recycling mechanism of the present invention is described.

[0064] The electrode paste on the upper part of the electrode current collector sheet 100, which passes through the drying device 200, is dried and coated onto the surface of the electrode current collector sheet 100. The electrode paste on the upper part of the area where the adhesive film 21 is attached is also dried, and the adhesion of the lower adhesive film 21 decreases, thus making it peelable. However, since the electrode paste on the upper part of the adhesive film 21 is connected to the electrode paste on the part that does not have the adhesive film 21 (coated part), the adhesive film 21 should be removed using a predetermined peeling tool because it is not easy to peel off. The adhesive film 21 can be recovered by adsorbing it using a predetermined device.

[0065] That is, such as Figure 3As shown, the adhesive film 21 can be peeled off by using a vacuum adsorption device 300 to adsorb the upper surface of the electrode current collector sheet 100. At this time, since the electrode paste portion without adhesive film 21 is already coated on the surface of the electrode current collector sheet 100, its adhesion is much higher than that of the adhesive film 21, so the vacuum adsorption device 300 cannot peel off the electrode paste portion. Therefore, the adhesive film 21 can be recovered by peeling off the adhesive film 21 using the vacuum adsorption device 300. When the adhesive film 21 is recovered, the surface of the electrode current collector sheet 100 is exposed, and the exposed surface becomes the uncoated portion 20. Therefore, the pattern of the coated portion with electrode paste coated on the coated portion and the uncoated portion without electrode paste coated on the uncoated portion is completed by peeling off and recovering the adhesive film.

[0066] In this invention, the process of peeling off the adhesive film 21 can be performed continuously. That is, for example, the adhesive film 21 can be peeled off by adsorbing the front surface of the electrode current collector sheet 100 while moving along the upper surface of the electrode current collector sheet 100, without having to peel off the adhesive film 21 by bringing the peeling device close to the portion where the adhesive film 21 is attached. As mentioned above, since the electrode paste of the coating portion 10 is already firmly attached to the surface of the electrode current collector sheet 100, the electrode paste will not be peeled off by the adsorption of the vacuum adsorption device 300, and only the adhesive film 21 on the portion forming the uncoated portion is easily peeled off due to the reduced adhesion. Therefore, since the adhesive film 21 can be peeled off while moving along the entire upper surface of the electrode current collector sheet 100 without specifying the portion where the adhesive film is attached, the peeling efficiency and production efficiency can be significantly improved. Here, since the electrode current collector sheet 100 moves from left to right along the production line, peeling can be performed continuously even when the adsorption device is fixed. Alternatively, considering the conveying speed of the electrode current collector sheet 100, the adsorption device can move in the opposite direction at an appropriate speed.

[0067] (Second Implementation)

[0068] Figure 5 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to another embodiment of the present invention.

[0069] The adhesive film adhesion-electrode slurry application-heat drying process is the same as in the first embodiment, therefore its description is omitted here. In this embodiment, the adhesive film 21 peeling and recovery device differs from that in the first embodiment. In this embodiment, the adhesive film 21 is peeled off by attaching an adhesive roller 400 with adhesive tape attached to its outer periphery to the electrode current collector sheet 100.

[0070] As the electrode current collector sheet 100 moves from left to right, the adhesive roller 400 peels off the adhesive film 21 from the surface of the electrode current collector sheet 100 while rotating counterclockwise. In this embodiment, peeling can be performed with a simple device configuration, eliminating the need for complex vacuum adsorption devices such as vacuum pumps as in the first embodiment.

[0071] Furthermore, in the first embodiment, since adsorption is performed by the vacuum adsorption device 300, adsorption can be performed at an upper portion slightly spaced from the surface of the electrode current collector sheet 100 without contacting the surface of the current collector sheet 100. Since the adhesive roller 400 peels by contacting the surface of the electrode current collector sheet 100, it may affect the surface of the electrode current collector sheet 100. On the other hand, the adhesive roller 400 may be advantageous in terms of peeling force because it directly contacts and peels. In this embodiment, the adhesive film 21 can be effectively peeled off while moving along the entire upper surface of the electrode current collector sheet 100 (or, the adhesive roller 400 can be fixed while the electrode current collector sheet 100 is moving).

[0072] When in contact with the surface of the current collector sheet (coated portion 10) according to the second embodiment, or in the case of the first embodiment, the electrode paste of the coated portion 10 may lift up at the boundary between the uncoated portion 20 and the coated portion 10 due to peeling force.

[0073] However, after the heating and drying process, the electrode current collector sheet 100 will undergo a rolling process in which the surface of the electrodes is flattened, so such warping is not a major problem. For example, if the surface of the electrode current collector sheet 100 is pressed by a rolling press, the boundary between the coated portion 10 and the uncoated portion 20 can also become flat.

[0074] (Third Implementation)

[0075] Figure 6 This is a schematic diagram illustrating a method for manufacturing an electrode plate according to yet another embodiment of the present invention.

[0076] In this embodiment, the number of adhesive films 21 is reduced from 3 to 2 along the width direction of the electrode current collector sheet 100.

[0077] Similarly, in this invention, the pattern of the uncoated portion 20 can be adjusted by adjusting the number of adhesive films 21 and the attachment position of the adhesive films 21. Alternatively, the pattern of the uncoated portion 20 and the final pattern on the electrode current collector sheet 100 can be adjusted by adjusting the size and shape of the adhesive films 21, etc.

[0078] Therefore, according to the present invention, various patterns for manufacturing electrode units can be produced by changing at least one of the quantity, position, size, and shape of the adhesive film 21. That is, since patterns corresponding to the type and shape of the electrode contacts can be produced, the degree of freedom in pattern formation is increased.

[0079] The continuous pattern coating method of the present invention can significantly improve the coating speed. Furthermore, the continuous peeling of the adhesive film 21 described above can increase the automation rate of the manufacturing process and further improve production efficiency.

[0080] Furthermore, the electrode plates for secondary batteries prepared by the method of the present invention can improve battery capacity and energy density.

[0081] Reference Figure 3 , Figure 5 and Figure 6 The electrode plate manufactured by the method of the present invention includes: at least one coated portion 10 coated with electrode paste, and at least one uncoated portion 20 uncoated without electrode paste. Here, the uncoated portions 20 are positioned at regular intervals along the longitudinal direction of the electrode current collector sheet 100, and the plurality of uncoated portions 20 are formed to be spaced apart from each other along the width direction of the electrode current collector sheet 100. The coated portions 10 are formed at least on the portions other than the uncoated portions 20. That is, in conventional electrode plates for secondary batteries, the uncoated portions are formed in a strip shape between the coated portions, and the electrode paste is not applied to the strip-shaped portion. However, in the present invention, the electrode paste can be coated on the portions between the uncoated portions 20. This is due to the unique configuration of the adhesion and peeling of the adhesive film 21. Figure 6 The uncoated portions 20 on the left and right sides of the coated portion 10 are removed by a slitting process. Therefore, in the electrode plate, the coated portion 10 on which the electrode paste is coated can be formed on the area other than the uncoated portion 20.

[0082] Therefore, when the coating area of ​​the electrode paste expands, the portion that substantially contributes to the battery capacity increases, thereby improving the battery capacity. Furthermore, since more electrode paste is applied to the electrode current collector sheet 100 of the same area, the energy density can also be increased. Regarding improvements in capacity and energy density, Figure 6 The electrode plates will be more Figure 3 and Figure 5 The electrode plates are more advantageous.

[0083] However, it should be noted that the coating portion 10 cannot be expanded unconditionally, and the coating portion 10 can be expanded under the constraints of the number, position and shape of the sheet (metal) surface, the bonding portion and the required structure of other battery components.

[0084] The pattern coating technology of this invention can be applied to both positive and negative electrodes. Furthermore, it can be appropriately applied depending on the battery type; in particular, patterned electrodes required for manufacturing jelly roll electrodes can be obtained through a continuous coating process.

[0085] The present invention has been described in more detail above with reference to the accompanying drawings and examples. Therefore, the embodiments described in the specification and the configurations shown in the drawings are merely the most preferred embodiments of the invention and do not represent all the technical concepts of the invention. It should be understood that various equivalents and modifications may exist instead of them at the time of filing this application.

[0086] [Explanation of reference numerals in the attached figures]

[0087] 10: Coating section

[0088] 11: Electrode slurry coating section

[0089] 20: Uncoated area

[0090] 21: Adhesive film

[0091] 21a: Adhesive

[0092] 21b: Packing material

[0093] 21c: membrane

[0094] 100: Electrode current collector sheet

[0095] 200: Drying device

[0096] 300: Vacuum Adsorption Device

[0097] 400: Adhesive roller

Claims

1. A method for manufacturing an electrode plate for a secondary battery, the method comprising patterning an electrode current collector sheet to have coated portions having electrode paste coated on coated portions and uncoated portions not coated with the electrode paste, the method comprising: At least one adhesive film is attached to at least a portion of the uncoated portion of the electrode current collector sheet; Electrode paste is continuously coated onto the electrode current collector sheet, including the adhesive film attachment portion; The electrode slurry is heated and dried; as well as Peel the adhesive film off the electrode current collector sheet and recover the adhesive film. The heating and drying of the electrode slurry reduces the adhesion of the adhesive film, allowing it to be removed from the electrode current collector sheet during peeling and recycling. As the adhesive film is removed, the surface of the electrode current collector sheet is exposed. The adhesive film is peeled off from the surface of the electrode current collector sheet by adsorption.

2. The method according to claim 1, wherein during the heating and drying process of the electrode slurry, the adhesion of the adhesive film is reduced by heating.

3. The method of claim 1, wherein the adhesive film comprises a filler that expands in volume upon heating.

4. The method according to claim 3, wherein the filler expands at a temperature of 80°C or higher.

5. The method according to claim 4, wherein the filler expands at a temperature between 100°C and 200°C.

6. The method of claim 1, wherein the adhesive film is peeled off by vacuum adsorption of the adhesive film using a vacuum adsorption device.

7. The method of claim 1, wherein the adhesive film is peeled off by adsorbing the adhesive film onto an adhesive roller with tape attached to its outer periphery.

8. The method of claim 1, wherein the adhesive film is peeled off by adsorbing the electrode current collector sheet while moving along the upper surface of the electrode current collector sheet.

9. The method of claim 1, wherein after removing the adhesive film, the surface of the electrode current collector sheet is flattened.

10. The method of claim 1, wherein the pattern on the electrode current collector sheet is adjusted by adjusting at least one of the quantity, size, and shape of the adhesive film, and the attachment position of the adhesive film.

11. An electrode plate for a secondary battery manufactured by the method according to any one of claims 1-10, the electrode plate comprising an electrode current collector sheet, the electrode current collector sheet comprising at least one coated portion having an electrode paste coated on at least one coated portion and at least one uncoated portion not coated with the electrode paste on at least one uncoated portion, The uncoated portions are positioned at regular intervals along the length direction of the electrode current collector sheet, the uncoated portions are formed to be spaced apart from each other along the width direction of the electrode current collector sheet, and coated portions coated with electrode paste are formed on the portions other than the uncoated portions.

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