Drying device and drying method for electrode sheets

Abstract

The present invention relates to an electrode sheet drying device, which includes a guide roller having a plurality of perforated holes formed on an outer circumferential surface thereof, and the guide roller is configured to vacuum-suck an electrode sheet, thereby preventing the electrode sheet from lifting up from the guide roller during a drying process, reducing the occurrence of wrinkles in uncoated areas, and preventing lifting up and cracks in a current collector.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0184673, dated December 22, 2021.

[0002] The present invention relates to an electrode sheet drying device and method for reducing wrinkles in uncoated areas during the electrode sheet drying process and preventing cracks from occurring at the boundary between the uncoated and coated areas. [Background technology]

[0003] With the rapid increase in fossil fuel use, there is an increasing demand for alternative and clean energy, and as part of this, the field of electrochemical power generation and storage is one of the most actively researched areas.

[0004] Currently, a typical example of an electrochemical element that uses such electrochemical energy is a secondary battery, and the range of its use is tending to expand more and more.

[0005] Meanwhile, to manufacture an electrode for a secondary battery, an electrode slurry, which is a mixture of an electrode active material, a binder, and a solvent, is coated on a current collector and dried. Then, the current collector coated with the electrode slurry is dried, and cut and notched to a required size to manufacture an electrode for a secondary battery.

[0006] In the electrode manufacturing process, the step of drying the electrode slurry is costly and time-consuming, and the drying step affects the overall efficiency of the electrode manufacturing process.

[0007] Figure 1 is a schematic diagram of a guide roller installed in a conventional electrode drying device, and Figure 2 illustrates the problems that arise when drying electrodes using a conventional electrode drying device. Referring to these figures, an electrode sheet 10 is divided into a coated portion 12, which is the portion of the current collector where electrode slurry is applied, and an uncoated portion 11, where no electrode slurry is applied and the current collector is exposed. When this electrode sheet is dried, the coated portion adjacent to the uncoated portion dries faster than the other coated portions and loses weight earlier than the other portions.

[0008] As a result, the current collector in the coated area adjacent to the uncoated area, which has become lighter in weight, is unable to come into close contact with the lower guide roller 20 that supports and runs the electrode sheet 10, which can cause the current collector to lift upward from the guide roller 20. This current collector lifting phenomenon can be further exacerbated by hot air sprayed upward toward the electrode sheet from a lower hot air supply unit installed below the electrode sheet.

[0009] If the coated region adjacent to the uncoated region is dried in a floating state during the drying process, the uncoated region 11 is stretched due to the high temperature, causing wrinkles (arrows) in the uncoated region 11 and cracks C at the boundary between the coated and uncoated regions, as shown in Figure 2. These wrinkles and cracks in the uncoated region can further exacerbate waviness during the subsequent rolling process, and can cause breaks in which parts of the uncoated region are cut off during the slitting process into unit electrodes.

[0010] Therefore, the reality is that there is a need for technological development that can solve the above-mentioned problems in the electrode sheet drying process. Summary of the Invention [Problem to be solved by the invention]

[0011] An object of the present invention is to provide an electrode sheet drying device and drying method that reduces the occurrence of wrinkles in the uncoated parts during the drying process of an electrode sheet that includes coated and uncoated parts, and prevents the current collector from lifting and cracking at the boundary between the uncoated and coated parts. [Means for solving the problem]

[0012] According to the present invention, there is provided an electrode sheet drying device for drying an electrode slurry coated on a sheet-shaped current collector, the electrode sheet drying device including: a main body having an internal storage space for drying and having an inlet and an outlet; one or more guide rollers installed inside the main body and supporting and running the electrode sheet by rotational motion; and a vacuum pump applying negative pressure to the inside of the guide roller, wherein a plurality of perforated holes are formed on the outer circumferential surface of the guide roller so that the electrode sheet can be adsorbed to the guide roller.

[0013] In one embodiment of the present invention, each of the plurality of perforated holes can be configured to be openable and closable.

[0014] In one embodiment of the present invention, the plurality of perforated holes may be distributed over the entire outer circumferential surface of the guide roller.

[0015] The drying apparatus according to one embodiment of the present invention may further include a perforated hole opening / closing controller that controls the opening and closing operation of the perforated holes.

[0016] In one embodiment of the present invention, the guide roller is divided into a plurality of suction zones along the longitudinal direction, and the perforated hole opening / closing controller may be configured to independently control the opening and closing operation of the perforated hole for each of the suction zones.

[0017] The drying apparatus according to an embodiment of the present invention may further include a suction pipe located below the guide roller and connected to the vacuum pump.

[0018] In one embodiment of the present invention, the inside of the suction pipe may be provided with a partition wall that divides the inside of the suction pipe.

[0019] In one embodiment of the present invention, the suction pipe may have a length corresponding to the length of the guide roller.

[0020] The drying device according to an embodiment of the present invention may further include a hot air supplying unit configured to spray hot air toward the electrode sheet.

[0021] In one embodiment of the present invention, the hot air supply unit may include a heat exchanger that heats the supplied outside air, a blower fan that supplies the outside air heated by the heat exchanger into the inside of the main body, and a hot air injection nozzle that is installed inside the main body and injects hot air toward the electrode sheet.

[0022] In an embodiment of the present invention, the vacuum pump is connected to the heat exchanger by a circulation pipe, and air sucked through the vacuum pump can be supplied to the heat exchanger.

[0023] In one embodiment of the present invention, the diameter of the perforated hole may be 0.1 mm to 10 mm.

[0024] The present invention also provides a method for drying an electrode sheet using the above-mentioned drying device. [Effects of the Invention]

[0025] The electrode sheet drying device and method according to the present invention include a guide roller that supports and runs an electrode sheet, has a plurality of perforated holes formed on its outer peripheral surface, and includes a vacuum pump that can apply negative pressure to the inner holes of the guide roller. This allows the electrode sheet transported by the guide roller to adhere tightly to the guide roller when a vacuum is applied, thereby reducing the occurrence of wrinkles in the uncoated portion and preventing lifting and cracking of the current collector.

[0026] In addition, in the electrode sheet drying device according to the present invention, a plurality of perforated holes are formed on the entire outer peripheral surface of the guide roller, and each of the plurality of perforated holes can be opened and closed, so that only a portion of the electrode sheet at a desired position along the width direction of the electrode sheet can be selectively adsorbed to the guide roller. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram of a guide roller installed in a conventional electrode drying oven. [Figure 2] 1 is a diagram illustrating a problem that occurs when an electrode is dried using a conventional electrode drying oven. [Figure 3] FIG. 1 is a schematic diagram of an electrode sheet drying device according to an embodiment of the present invention. [Figure 4] 1 is a diagram of a guide roller according to an embodiment of the present invention. [Figure 5] 5A and 5B are diagrams showing the open and closed states of perforated holes formed in a guide roller according to one embodiment of the present invention, in which (a) of FIG. 5 shows a state in which all of the perforated holes are open, and (b) of FIG. 5 shows a state in which all of the perforated holes are closed. [Figure 6] 10 is a conceptual diagram for explaining the effect of a guide roller according to one embodiment of the present invention. FIG. [Figure 7] 1 is a diagram showing before and after drying of an electrode sheet using a drying device according to the present invention. [Figure 8] FIG. 10 is a schematic diagram of an electrode sheet drying device according to another embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram showing the circulation of air sucked by the vacuum pump in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0028] Because the present invention can be modified in various ways and can have various forms, specific embodiments are shown by way of example in the drawings and described in detail herein, but it is not intended to limit the invention to the particular forms disclosed, and it is understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and technical scope of the invention.

[0029] In this application, terms such as "comprise" and "have" are intended to specify the presence of a feature, numeral, step, operation, component, part, or combination thereof described in the specification, and are understood not to preclude the presence or addition of one or more other features, numerals, steps, operations, components, parts, or combinations thereof. Furthermore, when a layer, film, region, plate, or other part is described as being "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where there is another part between them. Conversely, when a layer, film, region, plate, or other part is described as being "under" another part, this includes not only the case where it is "directly under" the other part, but also the case where there is another part between them. Furthermore, in this application, "over" can include not only the case where it is "on top" but also the case where it is "under" the other part.

[0030] In this specification, the x-axis corresponds to the direction in which the electrode sheet is transported, the y-axis corresponds to the width direction of the electrode sheet and the length direction of the guide roller, and the z-axis corresponds to the direction perpendicular to the plane of the electrode sheet.

[0031] In the present invention, the uncoated portion refers to a portion of the electrode sheet where the electrode slurry is not applied and where the current collector is exposed.

[0032] The present invention will be described in detail below.

[0033] <Electrode sheet drying device> The electrode sheet drying device according to the present invention is an electrode sheet drying device for drying electrode slurry coated on a sheet-like current collector, and includes a main body having an internal storage space for drying and an inlet and an outlet, one or more guide rollers installed inside the main body and rotating to support and move the electrode sheet, and a vacuum pump that applies negative pressure inside the holes of the guide roller, and a plurality of perforated holes formed on the outer circumferential surface of the guide roller so that the electrode sheet can be adsorbed to the guide roller.

[0034] When an electrode sheet including a ground portion coated with electrode slurry and an uncoated portion not coated with electrode slurry is dried, the ground portion adjacent to the uncoated portion dries faster than the central portion of the ground portion, making the ground portion adjacent to the uncoated portion relatively lighter in weight, causing the electrode sheet to lift off the guide roller below. This causes wrinkles to form in the uncoated portion as it is stretched in a high-temperature environment, and induces cracks at the boundary between the ground and uncoated portions.

[0035] To solve the above problems, the electrode sheet drying apparatus according to the present invention has a guide roller that supports and runs the electrode sheet when drying the electrode sheet, and the guide roller has a plurality of perforated holes that allow vacuum suction. As a result, the electrode sheet passing over the guide roller is tightly attached to the guide roller by the vacuum suction force, and the electrode sheet does not float in the area of ​​the coated portion adjacent to the uncoated portion. As a result, the electrode sheet drying apparatus according to the present invention has the effect of reducing the occurrence of wrinkles in the uncoated portion and cracks at the boundary between the coated and uncoated portions after drying.

[0036] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the electrode sheet drying device according to the present invention will be described in detail with reference to the accompanying drawings.

[0037] First Embodiment FIG. 3 is a schematic diagram of an electrode sheet drying device according to a first embodiment of the present invention, FIG. 4 is a schematic diagram of a guide roller according to one embodiment of the present invention, and FIG. 5 is a diagram showing the open and closed states of perforated holes formed in a guide roller according to one embodiment of the present invention.

[0038] Referring to these drawings, the electrode sheet drying device 100 according to the present invention broadly comprises a main body 110, a guide roller 120, and a vacuum pump 130, and the guide roller 120 has a plurality of perforated holes 121 formed on its outer circumferential surface.

[0039] The electrode sheet 10 to be dried by the drying apparatus 100 of the present invention may include a sheet-shaped current collector 11 and an electrode slurry applied to one or both sides of the current collector 11. That is, the electrode sheet 10 of the present invention is manufactured by coating one side of a sheet-shaped current collector with an electrode slurry, and the electrode slurry 12 of the electrode sheet 10 manufactured in this manner is dried by the drying apparatus 100 of the present invention.

[0040] The main body 110 constitutes the main frame of the electrode sheet drying device 100, and has an accommodation space S for drying therein. An inlet 111 through which the electrode sheet 10 to be dried is inserted may be provided on one side of the main body 110, and an outlet 112 through which the electrode sheet 10 to be dried can be discharged after the drying process may be provided on the other side.

[0041] A drying means for drying the electrode slurry 12 is installed inside the main body 110. Specific examples of such a drying means include a hot air spraying nozzle that sprays hot air toward the electrode sheet and a heater. One or more hot air spraying nozzles and heaters may be installed above the electrode sheet 10.

[0042] The guide roller 120 serves to transport the electrode sheet 10 in one direction so that the electrode sheet 10 passes through the receiving space S, which serves as a drying oven, via the inlet 111 and the outlet 112 .

[0043] Specifically, the guide roller 120 may rotate in one direction by receiving power from a motor (not shown), and one or more such guide rollers 120 may be installed inside the main body 110.

[0044] 4, the guide roller 120 of the present invention has a cylindrical outer shape, and a plurality of perforated holes 121 are formed on the outer circumferential surface thereof for adhering the electrode sheet onto the guide roller 120. The plurality of perforated holes 121 may be uniformly distributed over the entire outer circumferential surface of the guide roller 120.

[0045] The guide roller 120 has a through hole inside, and when a vacuum is applied to the inside of the guide roller 120 through the through hole, the electrode sheet 10 running on the guide roller 120 can be adsorbed to the outer surface of the guide roller 120 due to the pressure difference between the inside and outside of the guide roller 120.

[0046] Each of the plurality of perforated holes 121 may be configured to be openable and closable. Figure 5 is a diagram showing the open and closed states of the perforated holes according to an embodiment of the present invention, in which (a) of Figure 5 shows a state in which all of the perforated holes are open, and (b) of Figure 5 shows a state in which all of the perforated holes are closed.

[0047] A plurality of perforated holes 121 are formed throughout the guide roller 120, and each of the plurality of perforated holes 121 can be opened and closed. Therefore, some of the perforated holes 121 can be controlled to be open and the remaining perforated holes 121 can be controlled to be closed, thereby allowing the portion of the electrode sheet that is attracted to the guide roller 120 to be freely selected.

[0048] In addition, the guide roller 120 of this embodiment allows for free selection of the portion of the electrode sheet that is attracted to the guide roller 120, which has the advantage that it is not necessary to change the formation position of the perforated holes 121 every time the width of the uncoated portion where electrode slurry is not applied, the width of the coated portion where electrode slurry is applied, the application pattern of the electrode slurry, etc. are changed.

[0049] Referring to FIG. 6, when the uncoated portions 11 of the electrode sheet 10 are formed on both side edges of the electrode sheet 10 in the width direction (y-axis direction) as a reference, the electrode sheet does not lift up from the guide roller in the center portion of the electrode sheet 10 due to the weight of the electrode slurry while the electrode sheet passes through the main body 110 and is dried. However, lifting may occur in the uncoated portions 11 of the electrode sheet 10 and their surrounding areas. Therefore, in order to adsorb only this portion, as shown in FIG. 6(a), the perforated holes formed inside the both side edge portions in the length direction (y-axis direction) of the guide roller 120 (within the dotted square boxes) can be controlled to be open, and the remaining perforated holes can be controlled to be closed.

[0050] Furthermore, when the electrode slurry is applied to the electrode sheet 10 so that coated and uncoated areas 12 and 11 alternate along the width direction (y-axis direction), as shown in FIG. 6(b), the perforated holes formed in the uncoated areas 11 and the areas of the guide roller 120 corresponding to the areas (within the dotted square box) around them can be controlled to be open, while the remaining perforated holes can be controlled to be closed.

[0051] Referring to FIG. 5, the drying apparatus 100 according to the present invention may further include a perforated hole opening / closing controller 122 for controlling the opening / closing state of each of the plurality of perforated holes 121.

[0052] In addition, the guide roller 120 of the present invention is divided into a plurality of suction zones along the longitudinal direction (y-axis direction), and the perforated hole opening / closing controller 122 can independently control the opening / closing operation of the perforated holes for each of the suction zones.

[0053] 5, the guide roller 120 of the present invention may be divided into n suction zones (#1, #2, #3...#n) along the longitudinal direction (y-axis direction), and a plurality of perforated holes 121 may be formed in each suction zone.

[0054] The perforated hole opening / closing controller 122 can set the perforated holes formed in the #1 suction zone and the #2 suction zone to an open state, and the perforated holes formed in the remaining suction zones to a closed state. As a result, the perforated holes formed in the #1 suction zone and the #2 suction zone of the guide roller are open, so that the electrode sheet can be attracted through these perforated holes.

[0055] The perforated hole opening / closing controller 122 does not uniformly open or close the multiple perforated holes 121 formed throughout the guide roller 120, but rather divides the guide roller 120 into various suction zones (#1, #2, #3...#n) and controls the opening and closing of the perforated holes 121 for each suction zone. That is, it selectively controls the perforated holes in the suction zones corresponding to the portions of the electrode sheet that require suction to be open, while controlling the perforated holes in the remaining suction zones to be closed. This allows for the selection of suction portions along the width direction (y-axis direction) of the electrode sheet 10, and prevents the suction force caused by the application of vacuum from being transmitted to portions of the electrode sheet that do not require suction, thereby preventing damage to the electrode sheet or current collector.

[0056] The perforated holes 121 preferably have a small diameter so as not to damage the electrode in the coated portion and the current collector in the uncoated portion when adsorbed by vacuum application. Specifically, the diameter ranges from 0.1 mm to 10 mm, preferably from 0.2 mm to 7.5 mm, and more preferably from 0.5 mm to 5 mm.

[0057] The shape of the perforated hole 121 is not particularly limited, and may be one or more selected from the group consisting of a circle, an ellipse, and a polygon.

[0058] The vacuum pump 130 applies negative pressure to the inside of the through-holes of the guide roller 120. The pressure inside the guide roller 120 is reduced by the vacuum pump 130, and the electrode sheet 10 facing the guide roller 120 may be adsorbed to the outer circumferential surface of the guide roller.

[0059] The vacuum pump 130 may be installed outside the main body 110 , and may apply negative pressure to the inside of the guide roller 120 via a vacuum pump pipe 131 .

[0060] 3, the electrode sheet drying apparatus 100 according to the present invention may include a hot air supplying unit 140 that sprays hot air (indicated by an arrow) toward the electrode sheet 10 traveling in one direction within the main body 110 to dry the electrodes. Although not shown in FIG. 3, one or more heaters (not shown) that supply radiant heat to the electrode sheet may be installed inside the main body 110 to improve drying efficiency. Such heaters may be any known heaters used in electrode sheet drying apparatuses, and a specific example may be an infrared heater.

[0061] The hot air supply units 140 may be installed above and below the electrode sheet, respectively, and the hot air supply unit installed above the electrode sheet may spray hot air in a downward airflow direction toward the electrode, and the hot air supply unit installed below the electrode sheet may spray hot air in an upward airflow direction toward the electrode.

[0062] The drying device 100 according to the present invention may include one or more transport rollers inside the main body 110 for transporting the electrode sheet in the transport direction (x-axis direction), and some or all of these transport rollers may be configured as the above-mentioned guide rollers.

[0063] Figure 7 shows the electrode sheet before and after drying using the electrode sheet drying apparatus according to the present invention. Comparing Figures 2 and 7, the drying apparatus 100 according to the present invention includes guide rollers 120 formed with a plurality of perforated holes 121 that can adsorb the electrode sheet 10, thereby allowing some portions of the electrode sheet 10 to dry relatively quickly. This significantly reduces the risk of wrinkles in the uncoated portion or cracks at the boundary between the uncoated and coated portions, which would occur if the electrode sheet 10 were dried in a floating state above the transport roller due to a reduction in weight.

[0064] Second Embodiment FIG. 8 is a schematic diagram of an electrode sheet drying device according to another embodiment of the present invention, and FIG. 9 is a schematic diagram showing the circulation of air sucked by a vacuum pump in FIG.

[0065] Referring to these drawings, the electrode sheet drying device 200 according to the second embodiment of the present invention mainly includes a main body 210, a guide roller 220, a vacuum pump 230, a hot air supply unit 240 (241, 242, 243) and a suction pipe 250, and a plurality of perforated holes 221 are formed on the outer circumferential surface of the guide roller 220.

[0066] The main body 210, the guide rollers 220, the vacuum pump 230 and the hot air supply unit 240 have been described in detail above, so the suction pipe 250 will now be described in detail.

[0067] The suction pipe 250 according to the present invention is located below the guide roller 220, and the suction pipe 250 can be mechanically coupled to the guide roller 220 so that the guide roller 220 can rotate.

[0068] The suction pipe 250 may extend along the longitudinal direction (y-axis direction) of the guide roller 220, and the length in the extension direction (y-axis direction) may correspond to the length of the guide roller 220 in the longitudinal direction (y-axis direction).

[0069] The inside of the suction pipe 250 may be empty to allow air to flow. One side of the suction pipe 250 faces the guide roller 220 upward (based on the z-axis direction), and the other side is connected to a vacuum pump pipe 231 downward (based on the z-axis direction). The vacuum pump pipe 231 may be connected to a vacuum pump 230 installed outside the main body 210.

[0070] As a result, when negative pressure is applied by the vacuum pump 230, a pressure difference occurs between the inside and outside of the guide roller 220, and external air flows into the inside of the guide roller 220 through the perforated holes 221 of the guide roller 220. The air that has flowed in can be sucked into the vacuum pump 230 via the suction pipe 250 and the vacuum pump piping 231. The suction force of this air can then cause the electrode sheet 10 to be adsorbed onto the surface of the guide roller 220.

[0071] The suction pipes 250 may be paired with the guide rollers 220 such that one suction pipe 250 is coupled to each guide roller 220 .

[0072] The vertical cross section of the suction pipe 250 may be funnel-shaped, which allows for more effective generation of negative pressure inside the suction pipe 250 when a vacuum is applied by the vacuum pump 230 .

[0073] 9, a plurality of partitions 251 that divide the interior space of the suction tube 250 may be formed inside the suction tube. The partitions 251 may divide the guide roller 220 into several suction zones. When the perforated hole opening / closing controller controls the opening and closing of the perforated holes 221 for each suction zone, the partitions 251 may increase the speed at which external air flows into the guide roller 220 in the suction zones where the perforated holes are open, thereby doubling the suction force of the electrode sheet 10.

[0074] In one embodiment, the hot air supply unit 240 may include a heat exchanger 241 , a blower fan 242 , and a hot air injection nozzle 243 .

[0075] The heat exchanger 241 is configured to heat the outside air supplied to the main body 210, and the blower fan 242 is configured to supply the outside air heated by the heat exchanger 241 to a hot air injection nozzle 243 installed inside the main body 210, and the hot air injection nozzle 243 is installed inside the main body 210 and can be configured to inject hot air toward the electrode sheet 10.

[0076] The hot air supplied into the receiving space S of the main body 210 may have a flow structure in which, after being used on the electrodes to be dried, a portion is circulated and the remainder is exhausted to the outside.

[0077] In addition, the hot air supply unit may have a damper (not shown) operated by an actuator (not shown) installed in a duct (not shown) communicating with the inside of the accommodation space S of the main body 210. The amount of hot air supplied to the inside of the accommodation space S may be adjusted via the damper.

[0078] In one embodiment of the present invention, the vacuum pump 230 may be connected to the heat exchanger 241 by a circulation pipe 260 .

[0079] In this case, the air drawn in through the vacuum pump 230 can be circulated inside the main body via the heat exchanger 241 and the blower fan 242, thereby saving energy.

[0080] <How to dry the electrode sheet> The present invention provides a method for drying an electrode sheet using the above-described drying device.

[0081] A method for drying an electrode sheet according to one embodiment of the present invention includes a step of supplying an electrode sheet to the drying device described above, and a negative pressure application step of applying negative pressure to the inside of a guide roller using a vacuum pump so that the electrode sheet is adsorbed to the guide roller during the drying step.

[0082] In the negative pressure application process, all of the multiple perforated holes may be controlled to be open so that the entire electrode sheet is adsorbed to the guide roller, or, as described above, only the perforated holes corresponding to the portions of the electrode sheet that require adsorption may be selectively controlled to be open.

[0083] The above description merely exemplifies the technical concept of the present invention, and various modifications and variations may be made by a person skilled in the art without departing from the essential characteristics of the present invention. Therefore, the drawings disclosed in the present invention are intended to explain, rather than limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such drawings. The scope of protection of the present invention should be interpreted by the scope of the claims, and all technical concepts within the equivalent range should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0084] 10: Electrode sheet C: Crack 100, 200: Drying equipment 110, 210: Main body 20, 120, 220: Guide roller 121, 221: Perforated holes 130, 230: Vacuum pump 231: Vacuum pump piping 140, 240: Hot air supply section 241: Heat exchanger 242: Blower fan 243: Hot air nozzle 250: Suction pipe 251: Bulkhead 260: Circulation piping

Claims

1. An electrode sheet drying device that dries electrode slurry coated on a sheet-shaped current collector, a main body portion having an internal storage space for drying and including an inlet and an outlet; one or more guide rollers installed inside the main body and configured to support and move the electrode sheet by a rotational motion; and a vacuum pump that applies negative pressure to the inside of the guide roller; a plurality of perforated holes are formed on the outer circumferential surface of the guide roller, and the electrode sheet is attached to the guide roller; The plurality of perforated holes are distributed over the entire outer circumferential surface of the guide roller, An electrode sheet drying device, wherein each of the plurality of perforated holes is configured to be openable and closable.

2. The electrode sheet drying device according to claim 1 , further comprising a perforated hole opening / closing controller for controlling the opening and closing of the perforated holes.

3. The guide roller is divided into a plurality of suction zones along the longitudinal direction, The electrode sheet drying device according to claim 2 , wherein the perforated hole opening / closing controller controls the opening and closing of the perforated holes independently for each of the adsorption zones.

4. An electrode sheet drying device for drying electrode slurry coated on a sheet-shaped current collector, comprising: a main body portion having an internal storage space for drying and including an inlet and an outlet; one or more guide rollers that are installed inside the body and that rotate to support and move the electrode sheet; a vacuum pump that applies negative pressure to the inside of the guide roller; and a suction pipe located below the guide roller and connected to the vacuum pump; a plurality of perforated holes are formed on the outer circumferential surface of the guide roller, and the electrode sheet is attached to the guide roller; The electrode sheet drying device, wherein the plurality of perforated holes are distributed over the entire outer peripheral surface of the guide roller.

5. The electrode sheet drying device according to claim 4 , wherein a partition wall is provided inside the suction pipe to divide the inside of the suction pipe.

6. The electrode sheet drying device according to claim 4 , wherein the suction pipe has a length corresponding to a length of the guide roller.

7. The electrode sheet drying device according to claim 1 , further comprising a hot air supply unit configured to spray hot air toward the electrode sheet.

8. The hot air supply unit is a heat exchanger for heating the supplied outside air; a blower fan that supplies the outside air heated by the heat exchanger to the inside of the main body; and The electrode sheet drying device according to claim 7 , further comprising a hot air spray nozzle installed inside the main body for spraying hot air toward the electrode sheet.

9. An electrode sheet drying device for drying electrode slurry coated on a sheet-shaped current collector, comprising: a main body portion having an internal storage space for drying and including an inlet and an outlet; one or more guide rollers that are installed inside the body and that rotate to support and move the electrode sheet; a vacuum pump that applies negative pressure to the inside of the guide roller; and a hot air supply unit configured to inject hot air toward the electrode sheet; a plurality of perforated holes are formed on the outer circumferential surface of the guide roller, and the electrode sheet is attached to the guide roller; The plurality of perforated holes are distributed over the entire outer circumferential surface of the guide roller, The hot air supply unit is a heat exchanger for heating the supplied outside air; a blower fan that supplies the outside air heated by the heat exchanger to the inside of the main body; and a hot air injection nozzle installed inside the body and injecting hot air toward the electrode sheet; The electrode sheet drying device, wherein the vacuum pump is connected to the heat exchanger by a circulation pipe, and air sucked through the vacuum pump is supplied to the heat exchanger.

10. The electrode sheet drying device according to claim 1 , wherein the perforated holes have a diameter of 0.1 mm to 10 mm.

11. A method for drying an electrode sheet using the electrode sheet drying device according to claim 1.

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