Rolling assembly for roller press and roller press

Abstract

The invention discloses a rolling assembly for a roller press and the roller press, a pole piece is provided with a material area and a blank area, the rolling assembly comprises a first main roller and a second main roller, a first rolling channel is arranged between the first main roller and the second main roller, and the first rolling channel is suitable for rolling the pole piece; the traction rollers are arranged on the downstream side of the first rolling channel, the number of the traction rollers is at least one, and the pole pieces are arranged on the traction rollers in a winding mode; wherein the outer peripheral surface of at least one traction roller is provided with a convex part, and the convex part is suitable for abutting against the blank area so as to flatten the blank area, so that the occurrence of the phenomenon that the tab in the blank area is wrinkled can be reduced, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of rolling and flattening of battery pole pieces, and in particular to a rolling assembly and a rolling machine for a rolling machine. Background Art

[0002] Pole rolling is one of the processes in the battery manufacturing process. The purpose is to obtain a pole sheet thickness that meets the design parameters. In the actual rolling process, the active substances of the positive and negative electrode materials coated in the pole sheet material area need to be squeezed, and a certain pressure will also be applied to the copper foil and aluminum foil of the pole sheet, which will cause a certain extension of the copper foil and aluminum foil in the material area. Since the blank area of ​​the foil is not coated with positive and negative electrode materials, the thickness of the blank area will be less than the thickness of the material area, so the blank area will not be subjected to the pressure of the roller of the roller press and will not extend.

[0003] Due to the inconsistent extension of the two positions of the material area and the blank area, after leaving the rolling roller, the foil edge waves and vertical streaks are formed in the blank area. With the increase of the width of the pole piece and the number of strips, the wrinkling of the pole ear in the blank area is aggravated during the multi-width rolling process, affecting the appearance of the pole ear and the welding quality. When the wrinkles are severe, it will lead to breakage of the strip during rolling and subsequent processes, affecting product quality and production efficiency, and causing cost waste. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a rolling assembly for a rolling machine, which can reduce the occurrence of wrinkling of the tab in the blank area and improve product quality and production efficiency.

[0005] According to a rolling assembly for a rolling machine according to an embodiment of the present application, a material area and a blank area are provided on the pole piece, and the rolling assembly includes: a first main roller and a second main roller, a first rolling channel is provided between the first main roller and the second main roller, and the first rolling channel is suitable for rolling the pole piece; a traction roller, the traction roller is provided on the downstream side of the first rolling channel, the traction roller is constructed as at least one and the pole piece is wound around the traction roller; wherein a convex portion is provided on the outer peripheral surface of at least one of the traction rollers, and the convex portion is suitable for abutting against the blank area to flatten the blank area.

[0006] According to a rolling assembly for a rolling machine according to an embodiment of the present application, a pulling roller 3 with a protrusion 31 is arranged on the downstream side of a first rolling channel 11, and the protrusion 31 on the pulling roller 3 is utilized to increase the surface tension of the pole piece 7 to achieve flattening of the wrinkles in the blank area 72 of the pole piece 7, thereby improving product quality, solving the problem of wrinkles on the blank area 72, reducing the occurrence of wrinkling of the pole ears in the blank area, and improving product quality and production efficiency.

[0007] According to the rolling assembly for a rolling machine in some embodiments of the present application, the protrusion can be movably arranged relative to the traction roller to adjust the distance that the protrusion protrudes from the rolling surface of the traction roller.

[0008] According to some embodiments of the present application, a rolling assembly for a rolling machine, the traction roller includes: a roller body, a movable cavity is formed in the roller body; a movable block, the movable block is movably arranged in the movable cavity, the movable block is suitable for moving along the radial direction of the roller body to drive the outer surface of the roller body to form the convex portion; a driving device, the driving device is connected to the movable block and is suitable for driving the movable block to move in the radial direction.

[0009] According to some embodiments of the present application, the rolling assembly for a rolling machine comprises: a driving block housed inside the roller body and suitable for moving along the axial direction of the roller body; a connecting rod, one end of the connecting rod is hingedly connected to the driving block, and the other end of the connecting rod is hingedly connected to the moving block.

[0010] According to some embodiments of the present application, in the rolling assembly for a rolling machine, the moving block is configured as a plurality of blocks spaced apart in the circumferential direction of the roller body, the connecting rod is configured as a plurality of blocks corresponding one to one to the moving blocks, and the ends on the same side of the plurality of connecting rods are hinged to the driving block.

[0011] According to the rolling assembly for a rolling machine in some embodiments of the present application, each of the moving blocks is constructed as an arc-shaped plate protruding toward the radial outside.

[0012] According to some embodiments of the present application, in the rolling assembly for a rolling machine, the roller body is constructed as a flexible part, the moving block is suitable for abutting against the inner wall of the roller body, and the moving block is suitable for driving the outer surface of the roller body to deform under the drive of the driving device.

[0013] According to the rolling assembly for a rolling machine in some embodiments of the present application, the position of the moving block in the extension direction of the traction roller is adjustable.

[0014] According to some embodiments of the present application, in the rolling assembly for a rolling machine, the height difference between the outer end surface of the convex portion and the outer peripheral surface of the traction roller is H, and satisfies 0.1 mm≤H≤2 mm.

[0015] The following is a brief description of the roller press according to an embodiment of the present application.

[0016] The roller press according to an embodiment of the present application includes the roller press assembly and the stretching roller described in any of the above embodiments, the stretching roller is arranged downstream of the traction roller, the height difference between the stretching roller and the adjacent traction roller is h1, the height difference between two adjacent traction roller brackets is h2 and satisfies: 2≤h1 / h2≤5.

[0017] Since the roller press according to the embodiment of the present application is provided with the roller press assembly described in any of the above embodiments, the roller press according to the present application, after the convex part of the traction roller flattens the blank area, the stretching roller continues to stretch and adjust the pole piece, making the pole piece more regular as a whole, especially consolidating the flatness of the pole ear part, effectively reducing the wrinkling phenomenon of the pole ear in the blank area, thereby greatly improving the appearance quality of the product, and the cooperation of the stretching roller and the traction roller further ensures the flatness of the pole piece during the transmission process. The synergistic effect of multiple rollers further optimizes the wrinkling phenomenon of the pole ear in the blank area, and improves the consistency and reliability of the product. The height difference between the stretching roller and the adjacent traction roller is h1, and the height difference between the two adjacent traction roller brackets is h2. When h1 / h2≥2, it indicates that the height difference between the stretching roller and the adjacent traction roller is relatively large, and the large height difference can provide sufficient stretching force for the pole piece. After the initial flattening of the blank area by the traction roller, the stretching roller can further eliminate the residual wrinkles through a large stretching force to ensure the flatness of the pole piece. When h1 / h2≤5, it is to prevent the pole piece from being damaged due to excessive stretching caused by excessive height difference. If the height difference is too large, the pole piece may be subjected to excessive tension, which may cause the pole piece to become thinner, break or suffer other damage.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of a roller pressing assembly for a roller pressing machine according to an embodiment of the present application;

[0021] Figure 2 It is a structural schematic diagram of a traction roller provided with a convex portion in a rolling assembly for a rolling machine according to an embodiment of the present application;

[0022] Figure 3 It is a schematic side structural view of a traction roller provided with a convex portion in a rolling assembly for a rolling machine according to an embodiment of the present application;

[0023] Figure 4 It is a schematic structural diagram of the cooperation between a traction roller with a convex portion and a pole piece in a rolling assembly for a rolling machine according to an embodiment of the present application;

[0024] Figure 5 It is a schematic cross-sectional structure diagram of a traction roller provided with a convex portion in a rolling assembly for a rolling press according to an embodiment of the present application;

[0025] Figure 6 It is a structural schematic diagram of the cooperation between the driving device and the moving block in the rolling assembly of the rolling machine according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 100, rolling assembly;

[0028] 1. First main roller; 11. First roller pressing channel;

[0029] 2. Second main roller;

[0030] 3. Traction roller;

[0031] 31. convex part; 32. roller body; 321. moving cavity; 33. moving block; 34. driving device; 341. driving block; 342. connecting rod;

[0032] 4. Stretching roller;

[0033] 5. rubber roller; 51. second roller pressing channel;

[0034] 6. Steel roller;

[0035] 7. Pole piece;

[0036] 71. Blank area; 72. Material area. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] Hereinafter, with reference to the accompanying drawings, a rolling assembly 100 for a rolling machine according to an embodiment of the present application will be described.

[0039] like Figure 1-Figure 6 As shown, according to a rolling assembly 100 for a rolling machine according to an embodiment of the present application, a material area 72 and a blank area 71 are provided on the pole piece 7, and the rolling assembly 100 includes a first main roller 1, a second main roller 2 and a traction roller 3, a first rolling channel 11 is provided between the first main roller 1 and the second main roller 2, the first rolling channel 11 is suitable for rolling the pole piece 7, the traction roller 3 is provided on the downstream side of the first rolling channel 11, the traction roller 3 is constructed as at least one and the pole piece 7 is wound around the traction roller 3; wherein, a convex portion 31 is provided on the outer peripheral surface of at least one traction roller 3, and the convex portion 31 is suitable for abutting against the blank area 71 to flatten the blank area 71.

[0040] In the rolling assembly 100, when the material area 72 and the blank area 71 on the pole piece 7 pass through the first rolling channel 11 between the first main roller 1 and the second main roller 2, the material area 72 is uniformly rolled, and the material area 72 initially has a certain degree of flatness and compactness. However, due to the inconsistent extension of the two positions of the material area 72 and the blank area 71, the pole ear may be wrinkled in the blank area 71, affecting the appearance of the pole ear and the welding quality. Then, the pole piece 7 enters the traction roller 3 on the downstream side of the first rolling channel 11. The traction roller 3 is constructed as at least one, and the pole piece 7 is wound around the traction roller 3. The traction roller 3 ensures the stability of the pole piece 7 during the transmission process. At least one of the traction rollers 3 is provided with a convex portion 31 on its outer peripheral surface, and the convex portion 31 is suitable for abutting against the blank area 71. Since the convex portion 31 protrudes from the outer surface of the traction roller 3, when it contacts the pole piece 7, after the convex portion 31 contacts the pole piece 7, it drives the blank area 71 on the pole piece 7 to protrude in a direction radially away from the traction roller 3, thereby increasing the tension of the blank area 71 to flatten the wrinkles in the blank area.

[0041] Furthermore, the convex portion 31 on the outer peripheral surface of the traction roller 3 lifts up the blank area 71 on the pole piece 7. Since the convex portion 31 protrudes from the outer surface of the traction roller 3, when the convex portion 31 contacts the blank area 71, the blank area 71 is lifted upward and protrudes in a direction radially away from the traction roller 3. At the same time, since the convex portion 31 does not contact the material area 72, the material area 72 will not be deformed. Only the blank area 71 will be lifted and protrudes in a direction radially away from the traction roller 3, resulting in an increase in the tension in the blank area 71. Tension is a tensile force generated inside an object. On the blank area 71 of the pole piece 7, when the tension increases, the material of the blank area 71 will be stretched in all directions, and the stretching effect will act on the wrinkles of the blank area 71. When there are wrinkles in the blank area, as the tension increases, the materials on both sides of the wrinkles will be subjected to the tensile force on both sides of the wrinkles. The tensile force will unfold the wrinkled wrinkles, so that the material of the blank area 71 is restored to a uniform and smooth state.

[0042] By arranging the pulling roller 3 with the protrusion 31 on the downstream side of the first rolling channel 11, utilizing the protrusion 31 on the pulling roller 3 and increasing the surface tension of the pole piece 7, the wrinkles in the blank area 72 of the pole piece 7 are flattened, thereby improving the product quality and solving the problem of wrinkles on the blank area 72.

[0043] like Figure 2-Figure 6 As shown, according to the rolling assembly 100 for a rolling machine in some embodiments of the present application, the protrusion 31 can be movably arranged relative to the traction roller 3 to adjust the distance that the protrusion 31 protrudes from the rolling surface of the traction roller 3.

[0044] By setting the protrusion 31 so that the distance relative to the rolling surface of the traction roller 3 can be adjustable, the distance between the end of the protrusion 31 and the rolling surface can be adjusted. Protrusions 31 of different heights can correspond to the degree of wrinkling of the blank area 71 of the pole piece 7 under different conditions. The protruding distance of the protrusion 31 can also be adjusted according to the thickness of the pole piece 7, so that the protrusion 31 can adapt to the degree of wrinkling of the pole piece 7 under different conditions.

[0045] In some embodiments, for pole pieces 7 with different compressions, the pole piece 7 under smaller compression may require a smaller protrusion distance of the protrusion 31 to avoid excessive pressure on the pole piece 7 and damage to the pole piece 7; while the pole piece 7 under larger compression can appropriately increase the protrusion distance of the protrusion 31 to ensure that the protrusion 31 can generate sufficient tension in the blank area 71 to effectively flatten the wrinkles.

[0046] In other embodiments, in areas where the blank area 71 of the pole piece 7 has severe wrinkles, the wrinkles can be fully flattened by increasing the distance between the raised portion and the rolling surface. For areas where the wrinkles are severe, the protruding distance of the protrusion 31 can be appropriately increased to ensure that the protrusion 31 can generate sufficient tension in the blank area 71 to effectively flatten the wrinkles. In areas where the blank area 71 of the pole piece 7 has slight wrinkles, a smaller protruding distance of the protrusion 31 is required to allow the wrinkles in the blank area 71 to unfold, while avoiding excessive pressure on the pole piece 7 and damaging the pole piece 7.

[0047] In actual production, there are different batches and different specifications of pole pieces 7, and the wrinkles of the blank area 71 and the requirements for the force of the protrusion 31 will also be different. Since the distance of the protrusion 31 protruding from the rolling surface of the traction roller 3 is adjustable, when facing different pole pieces 7, the possible situation of not being able to effectively flatten the wrinkles or causing unnecessary damage to the pole piece 7 can be avoided.

[0048] like Figure 2-Figure 6 As shown, according to some embodiments of the present application, a rolling assembly 100 for a rolling machine, the traction roller 3 includes a roller body 32, a moving block 33 and a driving device 34. A moving cavity 321 is formed in the roller body 32. The moving block 33 is movably arranged in the moving cavity 321. The moving block 33 is suitable for moving along the radial direction of the roller body 32 to drive the outer surface of the roller body 32 to form a convex portion 31. The driving device 34 is connected to the moving block 33 and is suitable for driving the moving block 33 to move in the radial direction.

[0049] In the rolling assembly 100 of the rolling machine, the moving cavity 321 formed inside the roller body 32 provides a movable space for the moving block 33. The moving block 321 can move along the radial direction of the roller body 32 under the action of the driving device 34, so that the moving block 321 can protrude from the rolling surface of the traction roller 3, thereby forming a convex portion on the outer surface of the roller body 32. The formation of the convex portion 31 is controllable. When the pole piece 7 enters the rolling assembly 100 and starts working, the position of the moving block 33 can be adjusted by the driving device 34 according to the initial state of the pole piece 7, so as to control the distance of the convex portion 31 protruding from the rolling surface of the traction roller 3, so as to ensure that the convex portion 31 can abut against the blank area 71 of the pole piece 7, and the blank area 71 can be effectively flattened.

[0050] In some embodiments, the driving device 34 may be constructed as a cylinder, which is connected to the moving block 321 through the moving end of the cylinder to drive the moving block 321 to move in the radial direction of the traction roller 3 .

[0051] In other embodiments, the driving device 34 may be constructed as an electric lead screw, and the moving end of the electric lead screw is connected to the moving block 321 to drive the moving block 321 to move in the radial direction of the traction roller 3.

[0052] like Figure 5-Figure 6 As shown, according to some embodiments of the present application, a rolling assembly 100 for a rolling machine, a driving device 34 includes a driving block 341 and a connecting rod 342. The driving block 341 is accommodated inside the roller body 32 and is suitable for moving along the axial direction of the roller body 32. One end of the connecting rod 342 is hingedly connected to the driving block 341, and the other end of the connecting rod 342 is hingedly connected to the moving block 33.

[0053] In the roller pressing assembly 100 of the roller pressing machine, the driving block 341 is accommodated in the roller body 32 and can move along the axial direction of the roller body 32. It is hingedly connected to the moving block 33 which can move radially along the roller body 32 through the connecting rod 342. The connecting rod 342 is also hingedly connected to the driving block 341. When it is necessary to adjust the state of the protrusion 31, the driving block 341 moves in the axial direction of the roller body 32 in a direction close to the moving block 33. Under the push of the driving block 341, the connecting rod 342 changes the connection angle between the connecting rod 342 and the driving block 341 and the moving block 33. The thrust of the driving block 341 is converted into the radial thrust of the moving block 33 along the traction roller 3, thereby increasing the distance that the protrusion 31 protrudes from the traction roller 3. Conversely, when the driving block 341 moves in the axial direction of the roller body 32 in a direction away from the moving block 33, the connecting rod 342 is pushed and pulled by the driving block 341, and the connection angle between the connecting rod 342, the driving block 341 and the moving block 33 changes, thereby converting the pulling force of the driving block 341 into the radial pulling force of the moving block 33 along the traction roller 3, thereby reducing the distance that the protrusion 31 protrudes from the traction roller 3.

[0054] like Figure 5-Figure 6 As shown, according to some embodiments of the present application, in the rolling assembly 100 for a rolling machine, the moving block 33 is constructed as a plurality of blocks spaced apart in the circumferential direction of the roller body 32, the connecting rod 342 is constructed as a plurality of blocks corresponding one to one to the moving blocks 33, and the ends on the same side of the plurality of connecting rods 342 are hinged to the driving block 341.

[0055] In the roller pressing assembly 100 of the roller press, the moving blocks 33 are configured to be arranged in a plurality at intervals in the circumferential direction of the roller body 32, and the connecting rods 342 correspond to the moving blocks 33 one by one, and the ends on the same side of the plurality of connecting rods 342 are hinged to the driving block 341. The ends on the same side of the plurality of connecting rods 342 are hinged to the driving block 341, so that the movement of the driving block 341 can affect the plurality of moving blocks 33 at the same time, thereby improving the driving efficiency. When the driving block 341 moves in the axial direction of the roller body 32, the corresponding moving blocks 33 are respectively driven to move in the radial direction by the plurality of connecting rods 342, thereby forming a plurality of convex portions 31 in the circumferential direction of the outer surface of the roller body 32. When the pole piece 7 passes through the traction roller 3, the multiple protrusions 31 work together to continuously lift up the blank area 71 on the pole piece 7, increase the tension on the blank area 71, and increase the circumferential direction. The multiple protrusions 31 can continuously act on the blank area 71 of the pole piece 7, thereby improving the effect of flattening wrinkles. Compared with a single protrusion 31, the pole ear wrinkles and streaks can be flattened more effectively, and the pole ear wrinkling phenomenon in the blank area 72 can be reduced.

[0056] like Figure 5-Figure 6 As shown, in the rolling assembly 100 for a rolling machine according to some embodiments of the present application, each moving block 33 is constructed as an arc-shaped plate protruding toward the radial outside.

[0057] The arc-shaped moving block 33 increases the contact area with the pole piece 7, reduces the stress concentration in the blank area 71 on the pole piece 7, and prevents the pole piece 7 from being damaged during the flattening process. When the plane-shaped moving block 33 acts on the pole piece, due to the small contact area, the local pressure may be too high, causing the pole piece 7 to bear a large stress in this area, which is prone to damage. The arc-shaped moving block 33 has a large contact area, which means that the force can be more evenly distributed on the pole piece 7. In the process of flattening the wrinkles, the arc-shaped moving block 33 can disperse the force to a larger area, thereby reducing the stress concentration in the blank area on the pole piece, making the stress distribution on the pole piece 7 more uniform, and reducing the risk of pole piece damage. Since the arc-shaped moving block 33 has a larger contact area with the pole piece 7, it can apply force to the blank area 71 of the pole piece in a larger range, so that the wrinkles can be flattened in a wider area. At the same time, the evenly distributed force can also avoid the rebound of wrinkles caused by excessive local stress, and improve the stability and durability of flattening.

[0058] Furthermore, by adjusting the number of moving blocks 33, the convex portion 31 can form a continuous curved surface in the circumferential direction of the outer surface of the traction roller 3, that is, a cylinder that is coaxial with the traction roller and larger than the traction roller is formed on the outer surface of the traction roller, and the continuous curved convex portion can fit more closely with the blank area 71 of the pole piece 7. When the pole piece 7 passes through the traction roller 3, the height of the blank area 71 can be stabilized, the tension generated in the blank area 71 can be stabilized, and the damage of the pole piece 7 can be reduced.

[0059] like Figure 1-Figure 6 As shown, according to the rolling assembly 100 for a rolling machine of some embodiments of the present application, the roller body 32 is constructed as a flexible part, the moving block 33 is suitable for abutting against the inner wall of the roller body 32, and the moving block 33 is suitable for driving the outer surface of the roller body 32 to deform under the drive of the driving device 34.

[0060] In the roller pressing assembly 100 of the roller pressing machine, the roller body 32 is constructed as a flexible member. When the moving block 33 abuts against the inner wall of the roller body 32 driven by the driving device 34, the roller body 32 can better match the shape and position changes of the moving block 33 due to the flexible nature of the roller body 32.

[0061] The flexible roller body 32 can be deformed when subjected to the force of the moving block 33. The outer surface of the flexible roller body 32 is more likely to respond to the drive of the moving block 33. When the driving device 34 drives the moving block 33 to move radially outward of the roller body 32, the moving block 33 applies pressure to the inner wall of the roller body 32. Since the roller body 32 is flexible, the roller body 32 will deform outward under the pressure of the moving block 33 or retract inward as the moving block 33 moves radially inward, so that the outer surface of the roller body 32 forms the convex portion 31 or controls the protrusion degree of the convex portion 31 from the outer surface of the roller body 32. In contrast, if the roller body 32 is rigid, the force of the moving block 33 cannot be effectively transmitted to the outer surface of the roller body 32, resulting in difficulty in forming the convex portion 31.

[0062] like Figure 2-Figure 6 As shown, according to the rolling assembly 100 for a rolling machine according to some embodiments of the present application, the position of the moving block 33 in the extending direction of the traction roller 3 is adjustable.

[0063] Different pole pieces 7 may have differences in the position of the blank area 71. When the blank area 71 of a batch of pole pieces 7 is biased toward one end of the pole piece 7, the position of the moving block 33 in the extension direction of the traction roller 3 is adjusted so that the moving block 33 is close to the end of the traction roller 3 corresponding to the pole piece 7. After adjusting the position of the moving block 33, when the pole piece 7 passes through the traction roller 3, the convex portion 31 can act on the blank area 71 at that position, lift it up and increase the tension, thereby effectively flattening the wrinkles of the blank area 71. When the position of the moving block 33 can be adjusted, if the position of the blank area 71 on the pole piece 7 is inconsistent, the moving block 33 can be adjusted to the corresponding position so that the convex portion 31 can accurately abut against the blank area to improve the flattening effect.

[0064] like Figure 3 As shown, according to the rolling assembly 100 for a rolling machine in some embodiments of the present application, the height difference between the outer end surface of the protrusion 31 and the outer peripheral surface of the traction roller 3 is H, and satisfies 0.1mm≤H≤2mm.

[0065] When the height difference is within the above range, it can ensure that the protrusion 31 plays an effective supporting and flattening role during the transmission of the pole piece 7, and will not cause excessive pressure or damage to the pole piece 7 due to excessive height difference. When H≥0.1mm, it ensures that the protrusion 31 has a certain height to act on the blank area 71 of the pole piece 7. If the height difference is less than 0.1mm, the protrusion 31 may be too low to exert enough force on the blank area 71 to the outside and lift up the pole piece 7 under the tension of the pole piece 7. In this way, the wrinkles and streaks of the pole ear cannot be effectively flattened, thereby affecting the product quality; when H≤2mm, it is to prevent the protrusion 31 from being too high and causing damage to the pole piece 7. If the protrusion 31 is too high, when the pole piece 7 passes through the traction roller 3, the protrusion 31 may exert excessive local pressure on the pole piece 7, causing deformation, breakage or other damage to the pole piece 7. At the same time, an excessively high convex portion 31 may also affect the transmission stability of the pole piece 7, causing the pole piece 7 to jam or jump when passing through the traction roller 3, thereby reducing production efficiency. In addition, the upper limit of 2 mm also takes into account the overall structure and stability of the equipment, avoiding the traction roller 3 from becoming complicated and unstable due to an excessively high convex portion 31.

[0066] It should be noted that there are multiple protrusions 31 arranged at axial intervals on the outer peripheral surface of the traction roller 3, and there are also multiple groups of corresponding moving blocks 33 and connecting rods 342. The connecting rods 342 are hinged to the driving blocks 341. The moving blocks 33 and connecting rods 342 of each group are controlled by the driving blocks 341 to control the distance that the corresponding protrusions protrude from the rolling surface. The multiple protrusions 31 arranged at intervals along the axial direction can act on the pole piece 7 at different positions, ensuring that all parts of the pole piece 7 can be effectively processed.

[0067] The following is a brief description of the roller press according to an embodiment of the present application.

[0068] The rolling machine according to the embodiment of the present application includes a rolling assembly 100 and a stretching roller 4, the rolling assembly 100 is the rolling assembly 100 of any of the above-mentioned embodiments, the stretching roller 4 is arranged downstream of the traction roller 3, the height difference between the stretching roller and the adjacent traction roller 3 is h1, the height difference between the brackets of two adjacent traction rollers 3 is h2 and satisfies: 2≤h1 / h2≤5.

[0069] Since the rolling assembly 100 of any of the above embodiments is provided on the rolling machine according to the embodiment of the present application, therefore, after the convex portion 31 on the traction roller 3 flattens the blank area 71, the stretching roller 4 continues to stretch and adjust the pole piece 7, making the pole piece 7 more regular as a whole, especially consolidating the flatness of the pole ear part, effectively reducing the wrinkling phenomenon of the pole ear in the blank area 71, thereby greatly improving the appearance quality of the product, and the cooperation between the stretching roller 4 and the traction roller 3 further ensures the flatness of the pole piece 7 during the transmission process. The synergistic effect of multiple rollers further optimizes the wrinkling phenomenon of the pole ear in the blank area 71, and improves the consistency and reliability of the product. The height difference between the stretching roller and the adjacent traction roller 3 is h1, and the height difference between the two adjacent traction roller 3 brackets is h2. When h1 / h2≥2, it indicates that the height difference between the stretching roller 4 and the adjacent traction roller 3 is relatively large, and the large height difference can provide sufficient stretching force for the pole piece 7. After the blank area 71 is initially flattened by the traction roller 3, the stretching roller 4 can further eliminate the remaining wrinkles through a larger stretching force to ensure the flatness of the pole piece 7. When h1 / h2≤5, it is to prevent the pole piece 7 from being damaged due to excessive stretching caused by excessive height difference. If the height difference is too large, the pole piece 7 may be subjected to excessive tension, which may cause the pole piece 7 to become thinner, break, or suffer other damage.

[0070] It should be noted that a boss may also be provided on the stretching roller 4, and the structure of the boss on the stretching roller 4 is consistent with the structure of the boss on the traction roller 3, and the boss on the stretching roller 4 can cooperate with the boss on the traction roller 3. When the pole piece 7 passes through the traction roller 3, the boss preliminarily flattens the pole ear wrinkles and streaks in the blank area 71. Then, the pole piece 7 enters the stretching roller 4 area, and the boss on the stretching roller 4 continues to further process the blank area 71. Since the two have the same structure, the direction and magnitude of the force they apply to the pole piece 7 are relatively similar, which can more effectively and thoroughly flatten the pole ear wrinkles and improve the flatness and quality of the product.

[0071] The roller press also includes a rubber roller 5 and a steel roller 6, which are arranged on the downstream side of the stretching roller 4. A second rolling channel 51 is arranged between the rubber roller 5 and the steel roller 6. The second rolling channel 51 is suitable for rolling the unfolded pole piece 7. The combination of the rubber roller 5 and the steel roller 6 provides a reliable guarantee for the further processing of the pole piece 7. The rubber roller 5 has a certain elasticity, and can apply a relatively gentle pressure to the pole piece 7 when cooperating with the steel roller 6. At the same time, it can also play a buffering role to avoid excessive damage to the pole piece 7. After the pole piece 7 is processed by the boss on the stretching roller 4, the ear wrinkles and streaks of the blank area 71 are flattened to a certain extent. At this time, the pole piece 7 enters the second rolling channel 51 between the rubber roller 5 and the steel roller 6. The second rolling channel 51 can roll the unfolded pole piece 7 again to further consolidate the flatness and compactness of the pole piece 7. The pole piece 7 after being processed by the stretching roller 4 may still have some unevenness. These tiny defects can be eliminated by rolling with the rubber roller 5 and the steel roller 6, making the quality of the pole piece 7 more stable and reliable.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0074] In the description of the present application, “plurality” means two or more.

[0075] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0076] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rolling assembly for a rolling machine, wherein a material area (72) and a blank area (71) are provided on a pole piece (7), characterized in that: include: A first main roller (1) and a second main roller (2), wherein a first rolling channel (11) is provided between the first main roller (1) and the second main roller (2), and the first rolling channel (11) is suitable for rolling the pole piece (7); A traction roller (3), the traction roller (3) being arranged at the downstream side of the first rolling channel (11), the traction roller (3) being configured as at least one and the pole piece (7) being wound around the traction roller (3); Wherein, a convex portion (31) is arranged on the outer peripheral surface of at least one of the traction rollers (3), and the convex portion (31) is suitable for abutting against the blank area (71) to flatten the blank area (71).

2. The roller pressing assembly for a roller pressing machine according to claim 1, characterized in that: The convex portion (31) can be movably arranged relative to the traction roller (3) to adjust the distance by which the convex portion (31) protrudes from the rolling surface of the traction roller (3).

3. The roller pressing assembly for a roller press according to claim 2, characterized in that: The traction roller (3) comprises: A roller body (32), wherein a moving cavity (321) is formed in the roller body (32); a moving block (33), the moving block (33) being movably disposed in the moving cavity (321), the moving block (33) being adapted to move along the radial direction of the roller body (32) to drive the outer surface of the roller body (32) to form the convex portion (31); A driving device (34) is connected to the moving block (33) and is suitable for driving the moving block (33) to move in a radial direction.

4. The roller pressing assembly for a roller press according to claim 3, characterized in that: The driving device (34) comprises: A driving block (341), the driving block (341) being received in the roller body (32) and being adapted to move along the axial direction of the roller body (32); A connecting rod (342), one end of the connecting rod (342) is hingedly connected to the driving block (341), and the other end of the connecting rod (342) is hingedly connected to the moving block (33).

5. The roller pressing assembly for a roller press according to claim 4, characterized in that: The moving blocks (33) are configured to be a plurality of them spaced apart in the circumferential direction of the roller body (32); the connecting rods (342) are configured to be a plurality of them corresponding one to one to the moving blocks (33); and the ends on the same side of the plurality of connecting rods (342) are hinged to the driving block (341).

6. The roller pressing assembly for a roller press according to claim 5, characterized in that: Each of the moving blocks (33) is constructed as an arc-shaped plate protruding toward the radial outside.

7. The roller pressing assembly for a roller press according to any one of claims 3 to 6, characterized in that: The roller body (32) is constructed as a flexible member, the moving block (33) is suitable for abutting against the inner wall of the roller body (32), and the moving block (33) is suitable for driving the outer surface of the roller body (32) to deform under the drive of the driving device (34).

8. The roller pressing assembly for a roller pressing machine according to claim 7, characterized in that: The position of the moving block (33) in the extension direction of the traction roller (3) is adjustable.

9. The roller pressing assembly for a roller press according to claim 1, characterized in that: The height difference between the outer end surface of the convex portion (31) and the outer peripheral surface of the traction roller (3) is H, and satisfies 0.1mm≤H≤2mm.

10. A roller press, characterized in that: include: A rolling assembly (100), wherein the rolling assembly (100) is constructed as the rolling assembly (100) according to any one of claims 1 to 9; A stretching roller (4), wherein the stretching roller (4) is arranged downstream of the traction roller (3), the height difference between the stretching roller and the adjacent traction roller (3) is h1, and the height difference between the brackets of two adjacent traction rollers (3) is h2 and satisfies: 2≤h1 / h2≤5.

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