Calender roll press for manufacturing dry electrodes

Abstract

The invention discloses a calendering roll press for manufacturing dry electrode, which is used for stretching dry electrode sheet arranged with multiple calendering crown rollers, and comprises calendering crown rollers and a motor. The calendering crown rollers comprise a center roller and first and second side rollers, an inner wheel driving shaft is extended in the length direction at the center of the two side surfaces of the center roller; the inner surfaces of the first and second side rollers are respectively arranged opposite to the two side surfaces of the center roller, a hollow outer wheel driving shaft is extended in the length direction at the center of the outer surfaces of the first and second side rollers, and the inner wheel driving shaft passes through the hollow outer wheel driving shaft; and the motor independently and rotatably drives the center roller, the first side roller and the second side roller.

Description

Technical Field

[0001] This application claims priority based on Korean Patent Application No. 10-2021-0172100, filed on December 3, 2021, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to a calendering roll press for manufacturing dry electrodes.

[0003] More specifically, the present invention relates to a calendering roll press for manufacturing dry electrodes, wherein the calendering crown roll is divided into multiple parts, and each part rotates independently.

[0004] Furthermore, the present invention relates to a calendering roll press for manufacturing dry electrodes, which can make the quality of the dry electrode sheets uniform by adjusting the angular velocity of each part of the calendering crown roll differently. Background Technology

[0005] In recent years, rechargeable batteries have been widely used as the power source for wireless mobile devices.

[0006] In addition, secondary batteries have attracted attention not only as a power source for portable devices such as mobile phones, laptops, and cameras, but also as a power source for electric vehicles and hybrid vehicles, which have been suggested to address air pollution caused by traditional gasoline and diesel vehicles that use fossil fuels.

[0007] Therefore, due to the advantages of rechargeable batteries, the types of applications using rechargeable batteries have become very diverse, and in the future, it is expected that rechargeable batteries will be used in more fields and products than they are now.

[0008] These secondary batteries can be classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium polymer batteries based on the composition of their electrodes and electrolytes. The use of lithium-ion polymer batteries, which are easy to manufacture and less likely to leak, is increasing.

[0009] Generally, based on the shape of the battery casing, secondary batteries are divided into cylindrical batteries, which have electrode assemblies embedded in cylindrical metal cans and prismatic metal cans, respectively, and pouch batteries, which have electrode assemblies embedded in pouch-shaped casings of aluminum laminates.

[0010] Furthermore, the electrode assembly embedded in the battery casing is capable of being charged and discharged by consisting of a positive electrode, a negative electrode, and a separator placed between the positive and negative electrodes. The electrode assembly is divided into a jelly roll type, which is rolled up after placing the separator between a long sheet of positive and negative electrodes coated with active material, and a stack type, which is a multiple positive and negative electrodes of predetermined size inserted into the separator and stacked sequentially.

[0011] Here, because electric vehicles and the like use high-power electrical energy, electric vehicles require multiple battery modules, and these battery modules have multiple battery cells connected in series or in parallel on the inside.

[0012] Meanwhile, in electrode manufacturing, electrodes are typically manufactured using a wet electrode process. In the wet electrode process, the solvent in the slurry is removed after the electrode active material, binder, and conductive material are applied to the current collector.

[0013] The aforementioned wet electrode process requires energy to remove the solvent from the slurry applied to the current collector, which increases manufacturing costs and makes it difficult to improve productivity.

[0014] Therefore, a method for manufacturing electrodes using a dry electrode process is proposed, which does not involve applying slurry to the current collector.

[0015] Dry electrode manufacturing is a method of producing electrodes by mixing electrode active materials, binders and conductive materials to prepare a powder mixture in the absence of liquid media such as solvents and dispersion media, manufacturing the powder mixture into a dry electrode sheet through a calendering process, and laminating the prepared dry electrode sheet onto a current collector.

[0016] This dry electrode process improves energy density compared to the traditional wet electrode process. By improving charge and discharge characteristics, its lifespan is more than double that of the existing wet electrode process. Furthermore, it eliminates the need for the drying process required by the existing wet electrode process, thus offering advantages such as the elimination of the space required for a drying chamber and the corresponding drying process, as well as the cost of drying energy.

[0017] Here, in the dry electrode process, the calendering process for manufacturing dry electrode sheets is carried out by a calendering roll press. In the calendering roll press, multiple calendering crown rolls are arranged adjacently in multiple layers, and a process is performed to stretch and insert the dry electrode sheets between each of the multiple layers of calendering crown rolls.

[0018] That is, the dry electrode sheet is stretched by inserting it into and passing it between each calendering crown roll arranged in a plurality of multilayers, and the dry electrode sheet is laminated onto the current collector to manufacture the electrode.

[0019] Here, the calendering roll press has multiple layers of calendering crown rolls installed. Each calendering crown roll in the multiple layers rotates at a different speed, and the linear speed of each calendering crown roll increases along the processing direction.

[0020] like Figure 1 As shown, the diameter of the calender crown roll at the center of the calender crown roll is larger than the diameter of the two sides connected by the roll drive shafts 103a and 103b, and the calender crown roll has a gently convex curved shape in the length direction of the calender crown roll.

[0021] Therefore, when the linear speed ratio of adjacent calender crown rolls exceeds a certain value, there is a high risk of blockage and accumulation of the center portion of the dry electrode sheet inserted into the center portion, which has a larger roll diameter than the side portion of the calender crown roll.

[0022] That is, Figure 2 As shown, the dry electrode sheet 201 inserted between the calendering crown rollers 101, 101', and 101" cannot pass through the calendering crown rollers 101, 101', and 101" and gathers together, thus blocking the inlet and causing a buildup phenomenon.

[0023] As the diameter of the roller increases, the frequency of this accumulation phenomenon also increases.

[0024] As mentioned above, when dry electrode sheets accumulate as they pass between the calendering crown rolls, it may be difficult to produce dry electrode sheets with uniform quality, and the quality of the dry electrode sheets may deteriorate.

[0025] (Related technologies)

[0026] (Patent documents)

[0027] (Patent Document 1) Korean Patent Registration No. 10-0954617 Summary of the Invention

[0028] (Technical issue)

[0029] The present invention aims to solve the above-mentioned problems and provides a calendering roll press for manufacturing dry electrodes, which can divide a single calendering crown roll into multiple parts and control each part to have a different angular velocity by rotating each part independently.

[0030] Furthermore, the present invention aims to provide a calendering roll press for manufacturing dry electrodes, which can suppress the accumulation phenomenon that occurs at the entrance between the crown rolls during calendering by setting the angular velocity of the central portion of the calendering crown roll to be lower than that of the side portion.

[0031] Furthermore, the present invention aims to provide a calendering roll press for manufacturing dry electrodes, which can make the quality of the dry electrode sheet uniform by adjusting the angular velocity of each part of the calendering crown roll differently.

[0032] (Technical Solution)

[0033] To address the aforementioned problems, the present invention provides a calendering roll press for manufacturing dry electrodes. In the calendering roll press for manufacturing dry electrodes, a plurality of calendering crown rolls are arranged to stretch dry electrode sheets. The calendering roll press for manufacturing dry electrodes includes: calendering crown rolls; a center roll including an inner wheel drive shaft extending longitudinally from the center of both side surfaces; and a first side roll and a second side roll, whose inner surfaces are respectively opposite to the two side surfaces of the center roll. The first side roll and the second side roll have hollow outer wheel drive shafts extending longitudinally from the center of the outer surfaces of the first side roll and the second side roll, through which the inner wheel drive shaft passes; and a motor that independently and rotatably drives the center roll, the first side roll, and the second side roll.

[0034] As an example, the center roller and each of the first and second side rollers rotate at different angular velocities.

[0035] As another example, the angular velocity of the center roller is slower than the angular velocity of each of the first and second side rollers.

[0036] As another example, the angular velocities of the first and second side rollers are equal.

[0037] As a specific example, the outer peripheral surfaces of the first side roller, the center roller, and the second side roller may have a continuous parabolic surface, in which the center roller is convex.

[0038] As an example, the inner drive shaft of the center roller is longer than the outer drive shaft of the first and second side rollers, so that the inner drive shaft is exposed outside the outer drive shaft.

[0039] As another example, at least one or more bearings are provided between the inner circumferential surface of the outer wheel drive shaft and the outer circumferential surface of the inner wheel drive shaft.

[0040] As a specific example, the bearing is any one of a ball bearing, a roller bearing, or a journal bearing.

[0041] As another specific example, the motor includes a central motor connected to the central roller to rotate the central roller and a side motor connected to the first side roller and the second side roller to rotate each of the first side roller and the second side roller.

[0042] As an example, the inner wheel drive shaft located on one side of the central roller rotates by being connected to a central motor, and each hollow outer wheel drive shaft located on the outer surface of the first and second side rollers rotates by being connected to a side motor.

[0043] As a specific example, the inner wheel drive shaft is connected to a central sprocket on the shaft of the central motor via a chain for rotation, and each outer wheel drive shaft is connected to a side sprocket on the shaft of each side motor for independent rotation via a chain.

[0044] As another example, the inner wheel drive shaft located on one side of the central roller rotates by being connected to a central motor, and each hollow outer wheel drive shaft located on the outer surfaces of the first and second side rollers rotates together by being connected to a single side motor.

[0045] As a specific example, the inner wheel drive shaft is connected to a central sprocket on the shaft of the central motor via a chain for rotation, and each hollow outer wheel drive shaft is connected to side sprockets on both sides of a single shaft extending to both sides of a single side motor via a chain for rotation together.

[0046] (Beneficial effects)

[0047] According to the present invention, a single calendering crown roll can be divided into multiple parts, and by rotating each part independently, the angular velocity of each part can be controlled to be different.

[0048] Furthermore, by setting the angular velocity of the center portion of the calender crown roll to be lower than that of the side portion, the accumulation phenomenon that occurs between the calender crown rolls during the calendering process can be suppressed.

[0049] Furthermore, by adjusting the angular velocities of different components of the calendering crown roll, the quality of the dry electrode sheet can be made uniform. Attached Figure Description

[0050] Figure 1 This is a schematic side cross-sectional view of the calendering crown roll of a calendering roll press for manufacturing dry electrodes according to conventional technology.

[0051] Figure 2 This diagram schematically illustrates the calendering process of a calendering roll press for manufacturing dry electrodes according to conventional techniques.

[0052] Figure 3 This is a schematic diagram illustrating a calendering roll press according to an exemplary embodiment of the present invention.

[0053] Figure 4 This is a schematic side cross-sectional view of a calendering crown roll according to this exemplary embodiment.

[0054] Figure 5 This is a cross-sectional view along line A-A'.

[0055] Figure 6 This is a cross-sectional view along line B-B'.

[0056] Figure 7 This is a schematic diagram illustrating a calendering roll press according to another exemplary embodiment of the present invention.

[0057] Figure 8This is a diagram schematically illustrating another modified example of a calendering roll press according to this exemplary embodiment.

[0058] (Reference figures)

[0059] 1: Calendering crown roll

[0060] 10: Center Roller

[0061] 11: Inner wheel drive shaft

[0062] 20a: First side roller

[0063] 20b: Second side roller

[0064] 21a, 21b: Outer wheel drive shaft

[0065] 23: Bearings

[0066] 30: Electric motor

[0067] 31: Central motor

[0068] 32: Axis

[0069] 33: Center sprocket

[0070] 34: Chain

[0071] 35: Side motor

[0072] 35a: First side motor

[0073] 35b: Second side motor

[0074] 36: Axis

[0075] 37: Side sprocket

[0076] 38: Chain

[0077] 100, 100', 100”: Calendering roll press Detailed Implementation

[0078] This invention provides a calendering roll press for manufacturing dry electrodes. In the calendering roll press for manufacturing dry electrodes, a plurality of calendering crown rolls are arranged to stretch dry electrode sheets. The calendering roll press for manufacturing dry electrodes includes: calendering crown rolls, the calendering crown rolls including a center roll whose inner wheel drive shaft extends in the length direction from the center of both sides of the center roll, and a first side roll and a second side roll whose inner surfaces are respectively opposite to the two sides of the center roll. The first side roll and the second side roll have hollow outer wheel drive shafts that extend in the length direction from the center of the outer surfaces of the first side roll and the second side roll, the inner wheel drive shafts passing through the hollow outer wheel drive shafts, and a motor that independently and rotatably drives the center roll, the first side roll and the second side roll.

[0079] (Invention Model)

[0080] The present invention will now be described in detail. First, the terms and words used in this specification and claims should not be construed as limited to ordinary or dictionary terms, but should be interpreted as meanings and concepts consistent with the essence of the invention or the proposed technology, based on the principle that the inventor can appropriately define the concepts of the terms to best describe the invention.

[0081] The terms “comprising” or “having” as used herein indicate the presence of the features, figures, steps, actions, components, elements or combinations thereof described in the specification, but should be understood to exclude the possibility of the prior existence or addition of one or more other features, figures, steps, actions, components, elements or combinations thereof.

[0082] Furthermore, when a portion of a layer, film, region, or plate is disposed "on" another portion, this includes not only the case where one portion is "directly" on the other portion, but also the case where there is a third portion between the two. Conversely, when a portion of a layer, film, region, or plate is "below" another portion, this includes not only the case where one portion is "directly" below the other portion, but also the case where there is a third portion between the two. Moreover, in the description of this invention, "on" includes not only the case where it is disposed on the upper part, but also the case where it is disposed on the lower part.

[0083] (First Implementation)

[0084] Figure 3 This is a schematic diagram illustrating a calendering roll press according to an exemplary embodiment of the present invention. Figure 4 This is a schematic side cross-sectional view of a calendering crown roll according to this exemplary embodiment.

[0085] like Figure 3 and Figure 4 As shown, a calendering roll press 100 for manufacturing dry electrodes according to an exemplary embodiment of the present invention is used to stretch dry electrode sheets (not shown) by passing them between a large number of calendering crown rolls 1.

[0086] In the exemplary embodiment shown, the configuration includes: a calendering crown roll 1, which includes a center roll 10 and a first side roll 20a and a second side roll 20b disposed on both sides of the center roll 10; and a motor 30 for rotating the center roll 10, the first side roll 20a and the second side roll 20b.

[0087] The calendering crown roll 1 includes a center roll 10 and a first side roll 20a and a second side roll 20b whose inner surfaces are opposite each other on both sides of the center roll 10.

[0088] The center roller 10 has an inner wheel drive shaft 11 extending in the longitudinal direction at the center of both sides.

[0089] That is, such as Figure 5 As shown, the center roller 10 has rod-shaped inner wheel drive shafts 11 extending in the length direction of the center roller 10 at the center of both sides.

[0090] The center roller 10 has a first side roller 20a and a second side roller 20b on its two sides respectively.

[0091] Here, the inner surfaces of the first side roller 20a and the second side roller 20b are opposite to each other on both sides of the center roller 10, and the hollow outer wheel drive shafts 21a and 21b extend from the center of the outer surfaces of the first side roller 20a and the second side roller 20b in the length direction.

[0092] Furthermore, the hollow outer wheel drive shafts 21a and 21b of the first side roller 20a and the second side roller 20b have a hollow shape, so that the inner wheel drive shaft 11 of the center roller 10 can pass through the hollow outer wheel drive shafts 21a and 21b.

[0093] As a result, the inner surfaces of the first side roller 20a and the second side roller 20b are opposite to each other on both sides of the center roller 10, and the inner wheel drive shaft 11 penetrates the hollow outer wheel drive shafts 21a and 21b located at the center of the outer surfaces of the first side roller 20a and the second side roller 20b in the length direction, so that the end of the inner wheel drive shaft 11 extends to the outside of the hollow outer wheel drive shafts 21a and 21b.

[0094] Furthermore, the outer peripheral surfaces of the first side roller 20a, the center roller 10, and the second side roller 20b have a continuous parabolic surface, in which the center roller 10 is convex.

[0095] Here, the first side roller 20a and the second side roller 20b are respectively installed on both sides of the central roller 10, and the hollow outer wheel drive shafts 21a and 21b are inserted into each inner wheel drive shaft 11 extending from the center of both sides of the central roller 10.

[0096] Motor 30 is connected to center roller 10, first side roller 20a and second side roller 20b so that center roller 10 and first side roller 20a and second side roller 20b rotate independently.

[0097] Here, the motor 30 includes a center motor 31 and a side motor 35. The center motor 31 is connected to the center roller 10 to rotate the center roller 10, and the side motor 35 is connected to the first side roller 20a and the second side roller 20b to rotate the first side roller 20a and the second side roller 20b.

[0098] At this time, the side motor 35 may include a first side motor 35a and a second side motor 35b, the first side motor 35a being connected to the first side roller 20a to rotate the first side roller 20a, and the second side motor 35b being connected to the second side roller 20b to rotate the second side roller 20b.

[0099] According to the structure described above, the inner wheel drive shafts 11 respectively disposed on both sides of the central roller 10 are rotated by being connected to the central motor 31, and each hollow outer wheel drive shaft 21a, 21b disposed on the outer surface of the first side roller 20a and the second side roller 20b is rotated by being connected to the first side motor 35a and the second side motor 35b respectively.

[0100] Here, the center roller 10 and each of the first side rollers 20a and second side rollers 20b rotate at different angular velocities. That is, the center roller 10 located at the center of the calender crown roller 1 and each of the first side rollers 20a and second side rollers 20b disposed on both sides of the center roller 10 are structurally separate independent rollers, which can be rotated by changing the angular velocity of each of the center roller 10, the first side roller 20a, and the second side roller 20b.

[0101] As described above, when the dry electrode sheet is stretched as it passes between the calendering crown rolls 1 arranged adjacent to each other, it is helpful to allow each of the center roll 10 and the first side roll 20a and the second side roll 2b, which have different diameters, to rotate at different angular velocities in order to suppress the accumulation phenomenon between the calendering crown rolls 1.

[0102] Here, the angular velocity of the center roll 10 of the calender crown roll 1 is set to be slower than the angular velocity of each of the first side rolls 20a and the second side rolls 20b disposed on both sides of the center roll 10.

[0103] That is, when the rotational speed of the center roll 10 of the calendering crown roll 1 is set to be lower than the rotational speed of each of the first side rolls 20a and the second side rolls 20b provided on both sides of the center roll 10, the accumulation phenomenon that occurs when the dry electrode sheet cannot pass smoothly and gets stuck at the center of the calendering crown roll can be suppressed or slowed down, because the linear speed of the center roll 10 with a large roll diameter is high.

[0104] Meanwhile, the angular velocities of the first side roller 20a and the second side roller 20b are set to be equal.

[0105] That is, the first side roll 20a and the second side roll 20b are set to rotate at the same angular velocity, which is faster than the angular velocity of the center roll 10 in the calendering crown roll 1.

[0106] Therefore, the calendering roll press 100 for manufacturing dry electrodes according to the present invention may further include a control unit (not shown), which can control the angular velocities of the center roll 10, the first side roll 20a, and the second side roll 20b by being electrically connected to the center motor 31, the first side motor 35a, and the second side motor 35a. In this case, the first side roll 20a and the second side roll 20b can be controlled to rotate at the same angular velocity.

[0107] In an exemplary embodiment of the present invention, although the angular velocities of the first side roll 20a and the second side roll 20b are set to be equal, in some cases, by setting the angular velocities of the first side roll 20a and the second side roll 20b to be different, the accumulation phenomenon that may occur between the calendering crown roll 1 can be suppressed more effectively.

[0108] Meanwhile, each inner wheel drive shaft 11 of the center roller 10 is longer than the hollow outer wheel drive shafts 21a and 21b of the first side roller 20a and the second side roller 20b, such that the end of each inner wheel drive shaft 11 is exposed outside the hollow outer wheel drive shafts 21a and 21b.

[0109] With this structure, the inner wheel drive shaft 11 of the center roller 10 is connected to the center motor 31, and each hollow outer wheel drive shaft 21a, 21b of the first side roller 20a and the second side roller 20b is connected to the first side motor 35a and the second side motor 35b, respectively.

[0110] In one exemplary embodiment, the inner wheel drive shaft 11 is connected to the central sprocket 33 on the shaft 32 of the central motor 31 via a chain 34 for rotation. The first side roller 20a on one side of the central roller 10 is connected to the side sprocket 37 on the shaft 36 of the first side motor 35a via a chain 38 for rotation. The second side roller 20b on the other side of the central roller 10 is connected to the side sprocket 37 on the shaft 36 of the second side motor 35b via a chain 38 for rotation. Thus, all the central roller 10, the first side roller 20a, and the first side roller 20b can rotate independently.

[0111] In the exemplary embodiment of the present invention shown, the inner wheel drive shaft 11 and each hollow outer wheel drive shaft 21a, 21b are connected to the central sprocket 33 and side sprocket 37 of each central motor 31, first side motor 35a, and second side motor 35b via chains 34, 38 for rotation. However, the inner wheel drive shaft 11 and each hollow outer wheel drive shaft 21a, 21b can also be rotated by connecting with a belt, and various other power transmission mechanisms can be applied.

[0112] At the same time, such as Figure 6 As shown, at least one or more bearings 23 are disposed between the inner peripheral surfaces of the hollow outer wheel drive shafts 21a and 21b and the outer peripheral surface of the inner wheel drive shaft 11.

[0113] That is, the bearing 23 is disposed between the hollow outer wheel drive shafts 21a and 21b, which are hollowly disposed in the first side rollers 20a and the second side rollers 20b, and the inner wheel drive shaft 11 of the center roller 10 installed in the hollow outer wheel drive shafts 21a and 21b.

[0114] Multiple bearings 23 may be arranged around the inner wheel drive shaft 11 to correspond to the penetration length of the multiple bearings 23.

[0115] As described above, by providing a bearing 23 between the hollow outer wheel drive shafts 21a and 21b and the inner wheel drive shaft 11, the inner wheel drive shaft 11 rotating within the hollow outer wheel drive shafts 21a and 21b can be stably supported, thereby reducing energy loss due to friction.

[0116] Here, bearing 23 can be made of any of the following: ball bearing, roller bearing, or journal bearing.

[0117] In other words, rolling bearings or sliding bearings can be appropriately selected based on design conditions such as axial load and rotational speed.

[0118] The following will refer to Figure 3 The operation process of a calendering roll press for manufacturing dry electrodes according to an exemplary embodiment of the present invention is described.

[0119] First, in the calendering roll press 100 according to an embodiment of the present invention, a plurality of calendering crown rolls 1, consisting of a center roll 10, a first side roll 20a, and a second side roll 20b, are arranged adjacent to each other, and the dry electrode sheet is stretched as it passes through the plurality of calendering crown rolls 1.

[0120] Then, the center roller 10, the first side roller 20a, and the second side roller 20b are rotated by driving the center motor 31 that rotates the center roller 10 and the first side motor 35a and the second side roller 35b that rotate the first side roller 20a and the second side roller 20b, respectively.

[0121] Here, in the calendering crown roll 1, the first side roll 20a and the second side roll 20b, which are respectively arranged on the side of the center roll 10, rotate independently.

[0122] Furthermore, when the center roller 10 and the first side rollers 20a and the second side rollers 20b disposed on both sides of the center roller 10 rotate at different angular velocities, the angular velocity of the center roller 10 is set to be lower than the angular velocities of the first side rollers 20a and the second side rollers 20b disposed on both sides of the center roller 10, respectively.

[0123] Here, by controlling the first side motor 35a and the second side motor 35b to make the angular velocities of the first side roller 20a and the second side roller 20b equal and faster than the angular velocity of the center roller 10, the accumulation phenomenon that occurs when the dry electrode sheet passes between the calendering crown rollers 1 can be suppressed.

[0124] As described above, the present invention divides the calendering crown roll 1 into three parts: a center roll 10, a first side roll 20a, and a second side roll 20b; and changes the angular velocities between the separated center roll 10, first side roll 20a, and second side roll 20b. By setting the angular velocities of the first side roll 20a and the second side roll 20b to be equal to each other and faster than the angular velocity of the center roll 10, it is possible to prevent accumulation at the center portion of the center roll 10, which contacts the two sides of the dry electrode sheet whose diameter is larger than that of the relatively smaller first side roll 20a and the second side roll 20b.

[0125] (Second Implementation)

[0126] Figure 7 This is a schematic diagram illustrating a calendering roll press according to another exemplary embodiment of the present invention. Figure 8 This is a diagram schematically illustrating another modified example of a calendering roll press according to this exemplary embodiment.

[0127] like Figure 7 As shown, a calendering roll press 100' according to another exemplary embodiment of the present invention has a first side roll 20a and a second side roll 20b respectively disposed on both sides of a central roll 10, which rotate by connection to a single side motor 35.

[0128] That is, the inner wheel drive shaft 11 located on one side of the central roller 10 rotates by connecting to the central motor 31, and each hollow outer wheel drive shaft 21a, 21b of the first side roller 20a and the second side roller 20b rotates by being connected to a single side motor 35.

[0129] For this purpose, the inner drive shaft 11 of the central motor 31 is connected to the central sprocket 33 on the shaft 32 of the central motor 31 via a chain 34 for rotation, and each hollow outer drive shaft 21a, 21b is connected to each side sprocket 37 on both sides of a single shaft 36 via a chain 38 for rotation together, and the single shaft 36 extends to both sides of the single side motor 35.

[0130] As described above, the first side roller 20a and the second side roller 20b, which are connected to a single side motor 35, rotate at the same angular velocity. Unlike the first embodiment, the first side roller 20a and the second side roller 20b are rotated by a single side motor 35, which simplifies the overall configuration and reduces the cost of the equipment.

[0131] In this exemplary embodiment, the calender roll press 100' has a single shaft 36 extending to both sides of a single side motor 35, and side sprockets 37, individually disposed on both sides of the shaft 36, are rotatably connected to each first side roll 20a and second side roll 20b via chains 38. However, as a modified example, such as Figure 8 As shown, the calender roll press 100” has a single shaft that extends only to one side of the side motor 35, and each side sprocket 37 is arranged at equal intervals on the shaft 36 and is rotatably connected to each first side roll 20a and second side roll 20b via a chain 38.

[0132] As described above, the present invention has been described with reference to exemplary embodiments, but those skilled in the art or of ordinary skill should understand that the present invention can be modified and altered in various ways without departing from the spirit and scope of the invention as described in the appended claims.

Claims

1. A calendering roll press for manufacturing dry electrodes, wherein a plurality of calendering crown rolls are arranged to stretch dry electrode sheets, the calendering roll press comprising: A calendering crown roll includes: a center roll, with an inner wheel drive shaft extending longitudinally from the center of each of its two side surfaces; and a first side roll and a second side roll, the inner surfaces of which are respectively disposed opposite to the two side surfaces of the center roll, and a hollow outer wheel drive shaft extending longitudinally from the center of the outer surfaces of the first side roll and the second side roll, the inner wheel drive shaft passing through the hollow outer wheel drive shaft. An electric motor that independently and rotatably drives the center roller, the first side roller, and the second side roller. The motor comprises a center motor and side motors, the center motor being connected to the center roller to rotate the center roller, and the side motors being connected to the first side roller and the second side roller to rotate each of the first side roller and the second side roller. The outer peripheral surfaces of the first side roller, the center roller, and the second side roller have continuous parabolic surfaces, in which the center roller is convex.

2. The calendering roll press for manufacturing dry electrodes according to claim 1, wherein... The center roller and each of the first and second side rollers rotate at different angular velocities.

3. The calendering roll press for manufacturing dry electrodes according to claim 1, wherein... The angular velocity of the center roller is slower than the angular velocities of each of the first and second side rollers.

4. The calendering roll press for manufacturing dry electrodes according to claim 3, wherein... The angular velocities of the first side roller and the second side roller are equal.

5. The calendering roll press for manufacturing dry electrodes according to claim 1, wherein... The inner drive shaft of the center roller is longer than the hollow outer drive shafts of the first and second side rollers, such that the inner drive shaft is exposed outside the hollow outer drive shaft.

6. The calendering roll press for manufacturing dry electrodes according to claim 5, wherein... At least one or more bearings are disposed between the inner circumferential surface of the outer wheel drive shaft and the outer circumferential surface of the inner wheel drive shaft.

7. The calendering roll press for manufacturing dry electrodes according to claim 6, wherein... The bearing is any one of a ball bearing, a roller bearing, or a journal bearing.

8. The calendering roll press for manufacturing dry electrodes according to claim 1, wherein... The inner wheel drive shaft, located on one side of the central roller, rotates via a connection to the central motor, and each of the hollow outer wheel drive shafts, located on the outer surfaces of the first and second side rollers, rotates via a connection to each of the side motors.

9. The calendering roll press for manufacturing dry electrodes according to claim 8, wherein... The inner wheel drive shaft is connected to a central sprocket mounted on the shaft of the central motor via a chain for rotation. Each of the hollow outer wheel drive shafts is connected by a chain to a side sprocket mounted on the shaft of each side motor, allowing for independent rotation.

10. The calendering roll press for manufacturing dry electrodes according to claim 1, wherein... The inner wheel drive shaft, located on one side of the central roller, rotates by being connected to the central motor, and each of the hollow outer wheel drive shafts located on the outer surfaces of the first and second side rollers rotates together by being connected to a single side motor.

11. The calendering roll press for manufacturing dry electrodes according to claim 10, wherein... The inner wheel drive shaft is connected to a central sprocket mounted on the shaft of the central motor via a chain for rotation. Each of the hollow outer wheel drive shafts is connected by a chain to sprockets on both sides of a single shaft that extends to both sides of the single side motor, and they rotate together.

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