Calending roll press for manufacturing dry electrode

Abstract

The disclosed invention comprises a calendering roll press for manufacturing a dry electrode, wherein a plurality of calendering crown rolls are arranged to stretch a dry electrode sheet, and includes: a center roller having an inner ring drive shaft protruding longitudinally at the center of both sides; a first side roller and a second side roller having an inner surface facing each other on both sides of the center roller, and a hollow outer ring drive shaft protruding longitudinally at the center of the outer surface through which the inner ring drive shaft passes; and a motor that independently rotates the center roller and the first and second side rollers.

Description

Technology Field

[0001] The present invention relates to a calendering roll press for manufacturing dry electrodes.

[0002] More specifically, the present invention relates to a calendering roll press for manufacturing dry electrodes in which the calendering crown roll is separated into a plurality of parts and each part rotates independently.

[0003] In addition, the present invention relates to a calendering roll press for manufacturing dry electrodes that can make the quality of the dry electrode sheet uniform by adjusting the angular velocity of each part of the crown roll differently. Background Technology

[0004] Recently, rechargeable secondary batteries are being widely used as an energy source for wireless mobile devices.

[0005] Furthermore, secondary batteries are attracting attention not only as an energy source for portable devices such as mobile phones, laptops, and camcorders, but also for electric vehicles and hybrid electric vehicles, which are being proposed as solutions to address air pollution caused by conventional gasoline and diesel vehicles that use fossil fuels.

[0006] Therefore, the types of applications using secondary batteries are becoming highly diversified due to their advantages, and it is expected that secondary batteries will be applied to many more fields and products in the future than they are now.

[0007] These secondary batteries are classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium-polymer batteries depending on the composition of the electrodes and electrolytes; the use of lithium-ion polymer batteries is increasing because they have a low risk of electrolyte leakage and are easy to manufacture.

[0008] Generally, secondary batteries are classified according to the shape of the battery case into cylindrical batteries and prismatic batteries, in which the electrode assembly is embedded in cylindrical and prismatic metal cans, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of aluminum laminate sheets.

[0009] In addition, the electrode assembly embedded in the battery case is a power generation element capable of charging and discharging, having a structure comprising a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. It is classified into a jelly roll type, which is wound with a separator interposed between a long sheet-type positive and negative electrode coated with an active material, and a stack type, which is formed by sequentially stacking a plurality of positive and negative electrodes of a predetermined size with a separator interposed between them.

[0010] Here, since electric vehicles and the like use high-output electrical energy, multiple battery modules are required, and these battery modules have multiple battery cells connected in series or parallel inside.

[0011] Meanwhile, in the electrode process, it was common to manufacture electrodes through a wet electrode process in which a slurry containing an electrode active material, a binder, and a conductive material is applied onto a current collector, and then the solvent of the slurry is removed through a drying process.

[0012] The wet electrode process described above had high manufacturing costs and difficulty in improving productivity because energy was required to remove the solvent from the slurry coated on the current collector.

[0013] Therefore, a method of manufacturing an electrode through a dry electrode process without applying a slurry to the current collector is being proposed.

[0014] The dry electrode process is a method in which an electrode active material, binder, and conductive material are mixed without a liquid medium such as a solvent or dispersion medium, the powder mixture is manufactured into a dry electrode sheet through a calendering process, and the manufactured dry electrode sheet is laminated onto a current collector to produce an electrode.

[0015] This dry electrode process improves energy density and charge / discharge characteristics compared to the conventional wet electrode process, extending the lifespan by more than twofold. It also has the advantage of not requiring the drying process required in the conventional wet electrode process, thereby eliminating the need for a drying room, space, and energy costs for the drying process.

[0016] Here, in the dry electrode process, the calendering process for manufacturing a dry electrode sheet is carried out through a calendering roll press in which a plurality of calendering crown rolls are arranged in adjacent stages, and a process of feeding the dry electrode sheet between each of the multi-stage calendering crown rolls and stretching it is performed.

[0017] That is, a dry electrode sheet for manufacturing an electrode by laminating it with a current collector is fed between multiple multi-stage calendering crown rolls and stretched while passing it through.

[0018] Here, the calendering roll press installs calendering crown rolls in multiple stages, and each calendering crown roll installed in multiple stages rotates at a different speed, and at this time, the linear speed of each crown roll increases along the process direction.

[0019] As shown in FIG. 1, the calendering crown roll (101) is formed with a larger diameter in the central part of the roll than on both sides where the roll drive shafts (103a, 103b) are connected, and is formed in a gently convex curve shape along the length of the roll.

[0020] Accordingly, when the ratio of the linear velocities of adjacent crown rolls exceeds a specific value, there is a high risk of a banking phenomenon occurring in which the center of the dry electrode sheet fed into the inlet of the central part, where the diameter of the roll is larger than that of the side part, where the diameter of the roll is smaller, cannot pass between the rolls and becomes blocked.

[0021] That is, as illustrated in FIG. 2, a bank phenomenon occurs in which a dry electrode sheet (201) introduced between the calendering crown rolls (101, 101', 101") cannot pass between the calendering crown rolls (101, 101', 101") and clumps together, blocking the entrance.

[0022] The frequency of this bank phenomenon increases as the diameter of the roll increases.

[0023] As described above, when a bank phenomenon occurs in the dry electrode sheet passing between the calendering crown rolls, it is difficult to produce a dry electrode sheet of uniform quality, and there was a problem that the quality of the dry electrode sheet deteriorated. Prior art literature

[0024] Republic of Korea Registered Patent No. 10-0954617 The problem to be solved

[0025] The present invention is designed to solve the problems described above and aims to provide a calendering roll press for manufacturing dry electrodes, wherein a single calendering crown roll is separated into multiple parts and each part is configured to rotate independently, thereby allowing the angular velocity of each part to be adjusted differently.

[0026] In addition, the present invention aims to provide a calendering roll press for manufacturing dry electrodes that can suppress the banking phenomenon occurring at the entrance between the crown roll and the roll during the calendering process by setting the angular velocity of the center portion of the crown roll to be lower than the angular velocity of the side portion.

[0027] In addition, the present invention aims to provide a calendering roll press for manufacturing dry electrodes that can make the quality of the dry electrode sheet uniform by adjusting the angular velocity of each part of the crown roll differently. means of solving the problem

[0028] In order to realize the above-mentioned problem, the present invention comprises a calendering roll press for manufacturing a dry electrode in which a plurality of calendering crown rolls are arranged to stretch a dry electrode sheet, the calendering crown roll comprising: a center roller having an inner ring drive shaft protruding longitudinally at the center of both sides; a first side roller and a second side roller having a hollow outer ring drive shaft protruding longitudinally at the center of the outer surface, with each inner surface facing the center roller; and a motor that independently rotates the center roller and the first and second side rollers.

[0029] As an example, the center roller and each side roller rotate at different angular velocities.

[0030] As another example, the angular velocity of the center roller is slower than the angular velocity of each side roller.

[0031] As another example, the angular velocities of the first and second side rollers are the same.

[0032] As a specific example, the outer surfaces of the first side roller, the center roller, and the second side roller form a continuous parabolic surface that is convex to the center roller.

[0033] As an example, each inner ring drive shaft of the center roller is formed to be longer than the outer ring drive shafts of the first and second side rollers, so that each inner ring drive shaft is exposed to the outside of the outer ring drive shaft.

[0034] As another example, at least one bearing is provided between the inner circumference of the outer ring drive shaft and the outer circumference of the inner ring drive shaft.

[0035] As a specific example, the bearing is one of a ball bearing, a roller bearing, or a journal bearing.

[0036] As another specific example, the motor includes a center motor connected to a center roller to rotate the center roller, and a side motor connected to a first side roller and a second side roller to rotate each side roller.

[0037] As an example, the inner ring drive shaft formed on one side of the center roller is connected to the center motor and rotates, and the outer ring drive shafts formed on the outer sides of the first and second side rollers are connected to their respective side motors and rotate.

[0038] As a specific example, the inner ring drive shaft rotates by being connected to a center sprocket on the shaft of the center motor by a chain, and each outer ring drive shaft rotates independently by being connected to a side sprocket on the shaft of each side motor by a chain.

[0039] As another example, the inner ring drive shaft formed on one side of the center roller is connected to the center motor and rotates, and the outer ring drive shafts formed on the outer sides of the first and second side rollers are connected to a single side motor and rotate together.

[0040] As a specific example, the inner ring drive shaft is connected by a chain to a center sprocket provided on the shaft of the center motor and rotates, and each outer ring drive shaft is connected by a chain to each side sprocket provided on both sides of a shaft extending to both sides of a side motor and rotates together. Effects of the invention

[0041] According to the present invention, a single calendering crown roll is separated into multiple parts, and each part is configured to rotate independently so that the angular velocity of each part can be adjusted differently.

[0042] In addition, by setting the angular velocity of the center portion of the crown roll lower than the angular velocity of the side portion, the banking phenomenon occurring at the entrance between the crown roll and the roll during the calendering process can be suppressed.

[0043] In addition, the quality of the dry electrode sheet can be made uniform by adjusting the angular velocity of each part of the crown roll differently. Brief explanation of the drawing

[0044] FIG. 1 is a side cross-sectional view schematically showing a calendering crown roll of a calendering roll press for manufacturing dry electrodes according to the prior art. FIG. 2 is a diagram schematically showing the calendering process of a calendering roll press for manufacturing dry electrodes according to the prior art. FIG. 3 is a schematic diagram showing a calendering roll press according to one embodiment of the present invention. FIG. 4 is a side cross-sectional view schematically showing a calendering crown roll according to the present embodiment. Figure 5 is a cross-sectional view along line A-A'. Figure 6 is a cross-sectional view along the B-B' line. FIG. 7 is a schematic diagram showing a calendering roll press according to another embodiment of the present invention. FIG. 8 is a schematic diagram showing another modified example of a calendering roll press according to the present embodiment. Specific details for implementing the invention

[0045] The present invention will be described in detail below. Prior to this, terms or words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor may appropriately define the concepts of terms to best describe their invention, they must be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0046] Terms such as "comprising" or "having," as used throughout the specification of the present invention, are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0047] Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in the specification of the present invention, being "placed on" may include cases where it is placed on the lower part as well as the upper part.

[0048] Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in this application, being placed "on" may include cases where it is placed not only on the upper part but also on the lower part.

[0049] (First embodiment)

[0050] FIG. 3 is a schematic diagram showing a calendering roll press according to one embodiment of the present invention. FIG. 4 is a side cross-sectional view schematically showing a calendering crown roll according to the present embodiment. FIG. 5 is a cross-sectional view along line A-A'. FIG. 6 is a cross-sectional view along line B-B'.

[0051] As illustrated in FIGS. 3 and 4, a calendering roll press (100) for manufacturing a dry electrode according to one embodiment of the present invention is for stretching a dry electrode sheet (not shown) by passing it between a plurality of calendering crown rolls (1).

[0052] In the illustrated embodiment, it is configured to include a calendering crown roll (1) comprising a center roller (10) and a first side roller (20a) and a second side roller (20b) provided on both sides of the center roller (10), and a motor (30) that rotates the center roller (10) and the first and second side rollers (20a, 20b).

[0053] The above calendering crown roll (1) includes a center roller (10) and a first side roller (20a) and a second side roller (20b) with inner surfaces facing each other on both sides of the center roller (10).

[0054] The center roller (10) has an inner ring drive shaft (11) formed protruding in the longitudinal direction at the center of both sides.

[0055] That is, as shown in FIG. 5, the center roller (10) has a rod-shaped inner ring drive shaft (11) protruding in the longitudinal direction of the center roller (10) at the center of both sides.

[0056] The first side roller (20a) and the second side roller (20b) are respectively provided on both sides of the center roller (10).

[0057] Here, the inner surfaces of the first side roller (20a) and the second side roller (20b) face each other with respect to both sides of the center roller (10), and an outer ring drive shaft (21a, 21b) is formed protruding in the longitudinal direction at the center of the outer surfaces of the first side roller (20a) and the second side roller (20b).

[0058] And, the outer ring drive shafts (21a, 21b) of the first side roller (20a) and the second side roller (20b) are formed hollow so that the inner ring drive shaft (11) of the center roller (10) passes through them.

[0059] As a result, the inner surfaces of the first side roller (20a) and the second side roller (20b) face each other with respect to both sides of the center roller (10), and the inner ring drive shaft (11) passes through the outer ring drive shaft (21a, 21b) provided at the center of the outer surface of the first side roller (20a) and the second side roller (20b) in the longitudinal direction, and its end protrudes outward from the outer ring drive shaft (21a, 21b).

[0060] And, the outer surface of the first side roller (20a), the center roller (10), and the second side roller (20b) forms a continuous parabolic surface that is convex to the center roller (10).

[0061] Here, a first side roller (20a) and a second side roller (20b) are respectively installed on both sides of the center roller (10) in such a way that a hollow outer ring drive shaft (21a, 21b) is fitted into each inner ring drive shaft (11) that is formed protruding from the center of both sides of the center roller (10).

[0062] The motor (30) is connected to the center roller (10), the first side roller (20a), and the second side roller (20b) to independently rotate the center roller (10) and the first and second side rollers (20a, 20b).

[0063] Here, the motor (30) includes a center motor (31) connected to the center roller (10) to rotate the center roller (10), and a side motor (35) 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).

[0064] At this time, the side motor (35) may include a first side motor (35a) connected to a first side roller (20a) to rotate the first side roller (20a) and a second side motor (35b) connected to a second side roller (20b) to rotate the second side roller (20b).

[0065] According to the structure described above, the inner ring drive shaft (11) formed on one side of the inner ring drive shafts (11) formed on each side of the center roller (10) is connected to the center motor (31) and rotates, and each outer ring drive shaft (21a, 21b) formed on the outer side 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, and rotates.

[0066] Here, the center roller (10) and each side roller (20a, 20b) rotate at different angular velocities. That is, since the center roller (10) located at the center of the calendering crown roll (1) and each side roller (20a, 20b) provided on both sides of the center roller (10) are structurally separated and independent rollers, the angular velocities of each roller (10, 20a, 20b) can be rotated differently.

[0067] As described above, when a dry electrode sheet is stretched by passing it between the calendering crown rolls (1) after arranging the calendering crown rolls (1) in a plurality of adjacent to each other, it is useful to rotate the center roller (10) and each side roller (20a, 20b) with different diameters at different angular velocities to suppress the banking phenomenon occurring between the calendering crown rolls (1).

[0068] At this time, the angular velocity of the center roller (10) of the calendering crown roll (1) is set to be slower than the angular velocity of each side roller (20a, 20b) provided on both sides of the center roller (10).

[0069] That is, if the rotational speed of the center roller (10) of the calendering crown roll (1) is set lower than the rotational speed of each side roller (20a, 20b) provided on both sides of the center roller (10), the occurrence of a banking phenomenon in which the dry electrode sheet cannot pass smoothly through the center of the roll and becomes stagnant is suppressed or mitigated as the linear speed of the center roller (10), which has a large diameter of the roll, is large.

[0070] Meanwhile, the angular velocities of the first side roller (20a) and the second side roller (20b) are set to be equal to each other.

[0071] That is, the first side roller (20a) and the second side roller (20b), which are set faster than the angular velocity of the center roller (10) in the above-mentioned calendering crown roll (1), rotate at the same angular velocity as each other.

[0072] To this end, the calendering roll press (100) for manufacturing a dry electrode according to the present invention may further include a control unit (not shown), and the control unit is electrically connected to the center motor (31), the first side motor (35a), and the second side motor (35b) to control the angular velocity of the center roller (10), the first side roller (20a), and the second side roller (20b), and at this time, the first side roller (20a) and the second side roller (20b) may be controlled to rotate at the same angular velocity.

[0073] In one embodiment of the present invention, the angular velocities of the first side roller (20a) and the second side roller (20b) are set to be the same as each other, but in some cases, the angular velocities of the first side roller (20a) and the second side roller (20b) are set differently to more effectively suppress the banking phenomenon that may occur between the calendering crown rollers (1).

[0074] Meanwhile, each inner ring drive shaft (11) of the center roller (10) is formed to be longer than the outer ring drive shafts (21a, 21b) of the first and second side rollers (20a, 20b), so that the end of each inner ring drive shaft (11) is exposed to the outside of the outer ring drive shafts (21a, 21b).

[0075] Through this structure, the inner ring drive shaft (11) of the center roller (10) is connected to the center motor (31), and the outer ring drive shafts (21a, 21b) of the first and second side rollers (20a, 20b) are connected to the first and second side motors (35a, 35b).

[0076] In one embodiment, the inner wheel drive shaft (11) is connected by a chain (34) to a center sprocket (33) provided on the shaft (32) of the center motor (31) and rotates, and the first side roller (20a) provided on one side of the center roller (10) is connected by a chain (38) to a side sprocket (37) provided on the shaft (36) of the first side motor (35a) and rotates, and the second side roller (20b) provided on the other side of the center roller (10) is connected by a chain (38) to a side sprocket (37) provided on the shaft (36) of the second side motor (35b), so that all rollers (10, 20a, 20b) can rotate independently.

[0077] In one embodiment of the present invention illustrated, the inner ring drive shaft (11) and each outer ring drive shaft (21a, 21b) are connected to the sprockets (33, 37) of each motor (31, 35a, 35b) by a chain (34, 38) to rotate, but it is also possible for the inner ring drive shaft (11) and each outer ring drive shaft (21a, 21b) to be connected by a belt to rotate, and various other power transmission mechanisms may be applied.

[0078] Meanwhile, as illustrated in FIG. 6, at least one bearing (23) is provided between the inner circumference of the outer ring drive shaft (21a, 21b) and the outer circumference of the inner ring drive shaft (11).

[0079] That is, a bearing (23) is provided between the outer ring drive shaft (21a, 21b) formed hollowly in the first and second side rollers (20a, 20b) and the inner ring drive shaft (11) of the center roller (10) installed through the outer ring drive shaft (21a, 21b).

[0080] The above bearing (23) may be provided in multiple numbers around the circumference corresponding to the through length of the inner ring drive shaft (11).

[0081] As described above, by providing a bearing (23) between the outer ring drive shaft (21a, 21b) and the inner ring drive shaft (11), the inner ring drive shaft (11) rotating within the hollow outer ring drive shaft (21a, 21b) can be stably supported and energy loss due to friction can be reduced.

[0082] At this time, the bearing (23) may be made of any one of a ball bearing, a roller bearing, or a journal bearing.

[0083] In other words, rolling bearings or sliding bearings can be appropriately selected depending on design conditions such as shaft load and rotational speed.

[0084] Hereinafter, the operation process of a calendering roll press for manufacturing a dry electrode according to one embodiment of the present invention will be explained with reference to FIG. 3.

[0085] First, in a calendering roll press (100) according to one embodiment of the present invention, a plurality of calendering crown rolls (1) composed of a center roller (10) and first and second side rollers (20a, 20b) are arranged adjacent to each other, and a dry electrode sheet is stretched while passing through the plurality of calendering crown rolls (1).

[0086] Then, the center motor (31) that rotates the center roller (10), and the first side motor (35a) and the second side motor (35b) that rotate the first side roller (20a) and the second side roller (20b), respectively, are driven to rotate the center roller (10), the first side roller (20a), and the second side roller (20b).

[0087] At this time, the center roller (10) and the first side roller (20a) and the second side roller (20b), which are respectively provided on both sides of the center roller (10), are each rotated independently in the calendering crown roll (1).

[0088] In addition, the center roller (10) and the first side roller (20a) and the second side roller (20b), each provided on both sides of the center roller (10), are set to rotate at different angular velocities, and the angular velocity of the center roller (10) is set to rotate slower than the angular velocity of the first side roller (20a) and the second side roller (20b), each provided on both sides of the center roller (10).

[0089] Here, by controlling the first side motor (35a) and the second side motor (35b) so that the angular velocities of the first side roller (20a) and the second side roller (20b) are equal to each other and faster than the angular velocities of the center roller (10), the bank phenomenon occurring in the dry electrode sheet passing between the calendering crown rolls (1) can be suppressed.

[0090] As described above, the present invention separates the calendering crown roll (1) into three parts: a center roller (10), a first side roller (20a), and a second side roller (20b). The angular velocities of the separated center roller (10) and the first and second side rollers (20a, 20b) are different. In particular, the angular velocities of the first side roller (20a) and the second side roller (20b) are set to be the same and faster than the angular velocities of the center roller (10), thereby preventing a banking phenomenon in the central part that contacts the center roller (10), which has a larger diameter, compared to the two side parts of the dry electrode sheet that contact the first and second side rollers (20a, 20b), which have a relatively smaller diameter.

[0091] (Second embodiment)

[0092] FIG. 7 is a schematic diagram showing a calendering roll press according to another embodiment of the present invention. FIG. 8 is a schematic diagram showing another variation of a calendering roll press according to the present embodiment.

[0093] As illustrated in FIG. 7, a calendering roll press (100') according to another embodiment of the present invention has a first side roller (20a) and a second side roller (20b) each provided on both sides of a center roller (10), which are connected to a single side motor (35) and rotate.

[0094] That is, the inner ring drive shaft (11) formed on one side of the center roller (10) is connected to the center motor (31) and rotates, and the outer ring drive shafts (21a, 21b) of the first side roller (20a) and the second side roller (20b) are connected in common to one side motor (35) and rotate.

[0095] To this end, the inner ring drive shaft (11) of the center motor (31) is connected by a chain (34) to a center sprocket (33) provided on the shaft (32) of the center motor (31) and rotates, and each outer ring drive shaft (21a, 21b) is connected by a chain (38) to each side sprocket (37) provided on a shaft (36) extending to both sides of a side motor (35) and rotates together.

[0096] As described above, the first side roller (20a) and the second side roller (20b) connected to a single side motor (35) rotate at the same angular velocity, and unlike the first embodiment, by rotating the first side roller (20a) and the second side roller (20b) through a single side motor (35), the overall configuration can be simplified and equipment costs can be reduced.

[0097] In this embodiment, the calendering roll press (100') has a shaft (36) extending from both sides of the side motor (35), and side sprockets (37) are provided on each side of the shaft (36) and are rotatably connected to each side roller (20a, 20b) by a chain (38).

[0098] As a variation example, as shown in FIG. 8, a calendering roll press (100) may have a shaft (36) extending only to one side of the side motor (35), and side sprockets (37) provided at regular intervals on the shaft (36) and rotatably connected to each side roller (20a, 20b) by a chain (38).

[0099] Although the present invention is illustrated and described above in relation to specific embodiments, it will be readily apparent to those skilled in the art that various modifications and changes are possible without departing from the spirit and scope of the invention as set forth in the appended claims. Explanation of the symbols

[0100] 1 : Calendaring Crown Roll 10: Center roller 11: Inner ring drive shaft 20a: First side roller 20b: Second side roller 21a, 21b: Outer ring drive shaft 23 : Bearing 30 : Motor 31 : Center motor 32 : Shaft 33: Center sprocket 34 : Chain 35 : Side motor 35a: 1st side motor 35b: Second side motor 36 : Shaft 37 : Side sprocket 38 : Chain 100, 100', 100" : Calendaring Roll Press

Claims

Claim 1 A calendering roll press for manufacturing a dry electrode, wherein a plurality of calendering crown rolls are arranged to stretch a dry electrode sheet, comprising: a center roller having an inner ring drive shaft protruding longitudinally at the center of both sides; and a first side roller and a second side roller, each having an inner surface facing the center roller and a hollow outer ring drive shaft protruding longitudinally at the center of the outer surface through which the inner ring drive shaft passes; and a motor that independently rotates the center roller and the first and second side rollers; wherein the outer surface of the first side roller, the center roller, and the second side roller forms a continuous parabolic surface convex to the center roller. Claim 2 A calendering roll press for manufacturing dry electrodes according to claim 1, characterized in that the center roller and each side roller rotate at different angular velocities. Claim 3 A calendering roll press for manufacturing dry electrodes, characterized in that, in paragraph 2, the angular velocity of the center roller is slower than the angular velocity of each side roller. Claim 4 A calendering roll press for manufacturing dry electrodes, characterized in that, in paragraph 3, the angular velocities of the first and second side rollers are equal to each other. Claim 5 delete Claim 6 A calendering roll press for manufacturing dry electrodes, characterized in that, in claim 1, each inner ring drive shaft of the center roller is formed to be longer than the outer ring drive shafts of the first and second side rollers, so that each inner ring drive shaft is exposed to the outside of the outer ring drive shaft. Claim 7 A calendering roll press for manufacturing dry electrodes, characterized in that, in claim 6, at least one bearing is provided between the inner circumference of the outer ring drive shaft and the outer circumference of the inner ring drive shaft. Claim 8 A calendering roll press for manufacturing dry electrodes, characterized in that, in claim 7, the bearing is one of a ball bearing, a roller bearing, or a journal bearing. Claim 9 A calendering roll press for manufacturing dry electrodes according to claim 1, characterized in that the motor comprises a center motor connected to the center roller to rotate the center roller, and a side motor connected to the first side roller and the second side roller to rotate each side roller. Claim 10 A calendering roll press for manufacturing dry electrodes according to claim 9, characterized in that an inner ring drive shaft formed on one side of the center roller is connected to the center motor and rotates, and each outer ring drive shaft formed on the outer sides of the first and second side rollers is connected to the respective side motor and rotates. Claim 11 A calendering roll press for manufacturing dry electrodes, characterized in that, in claim 10, the inner ring drive shaft is connected by a chain to a center sprocket provided on the shaft of a center motor and rotates, and each outer ring drive shaft is connected by a chain to a side sprocket provided on the shaft of each side motor and rotates independently. Claim 12 A calendering roll press for manufacturing dry electrodes according to claim 9, characterized in that an inner ring drive shaft formed on one side of the center roller is connected to the center motor and rotates, and each outer ring drive shaft formed on the outer sides of the first and second side rollers is connected to a single side motor and rotates together. Claim 13 A calendering roll press for manufacturing dry electrodes according to claim 12, characterized in that the inner ring drive shaft is connected by a chain to a center sprocket provided on the shaft of a center motor and rotates, and each outer ring drive shaft is connected by a chain to each side sprocket provided on both sides of a shaft extending to both sides of a side motor and rotates together.

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