Flattening device

Abstract

The utility model provides a kind of rubbing device, for the ear of roll core is rubbed, and the ear includes the connecting portion and the bending portion being connected, and rubbing device includes pre-folding piece and rubbing wheel, and pre-folding piece is used to bend the bending portion along the direction of the axis of roll core, to make the bending portion with the first angle between connecting portion;Rubbing wheel is used to rub the bending bending portion, and can improve the technical problem that greater friction force between the ear and rubbing device in relevant technology is generated.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a kneading device. Background Technology

[0002] The tabs are crucial components connecting the internal electrodes (positive and negative) of a battery to the external circuitry. Tab forming is one of the key processes in battery manufacturing, and its quality directly impacts the battery's electrical performance, safety, and reliability. To further improve the quality of tab forming, it is necessary to optimize the physical morphology and structural stability of the tabs to ensure the reliability and overall performance of subsequent battery processes.

[0003] In related technologies, the tabs parallel to the core axis are flattened by a flattening roller. During this process, a large frictional force is generated between the tabs and the flattening roller, which easily produces metal shavings. Utility Model Content

[0004] The present invention provides a kneading device that can improve the technical problem of large friction between the electrode and the kneading device in related technologies.

[0005] An embodiment of this utility model provides a flattening device for flattening the tabs of a winding core. The tabs include a connecting part and a bending part connected together. The flattening device includes:

[0006] A pre-folding member, the pre-folding member being used to bend the bent portion along the axis toward the core, such that the bent portion and the connecting portion have a first angle; and

[0007] A flattening wheel is used to flatten the bent portion after bending.

[0008] Compared to related technologies where the tabs parallel to the core axis are directly flattened using a flattening wheel, in this embodiment, the bent portion is bent toward the core axis before being flattened, which reduces the friction between the flattening wheel and the bent portion, thereby reducing the amount of metal shavings generated during the friction process.

[0009] In one embodiment, the first angle ranges from 0° to 90°.

[0010] In one embodiment, the core is formed by winding a composite layer, and the height D1 of the bend satisfies:

[0011] D1 = at,

[0012] Where 'a' represents the number of weldable layers of the tab, and 't' represents the thickness of the composite layer. This ensures that the height of the bent portion meets the welding requirements.

[0013] In one embodiment, the flattening wheel includes a plurality of flattening portions, which are arranged along the axial direction of the flattening wheel and are rotatable about the axis of the flattening wheel for flattening the tabs.

[0014] During use, the rotation speed of each of the multiple flattening sections can be controlled separately according to the actual flattening condition of the tabs. This allows for less friction between the multiple flattening sections and the tabs, thereby reducing the generation of metal shavings and resulting in relatively low internal stress in the core. This further optimizes the condition of the end face and the inside of the core.

[0015] In one embodiment, the plurality of flattened portions form a conical structure, the diameter of the flattened portions gradually increasing as they move away from the axis of the core.

[0016] In one embodiment, the flattening roller includes a base, and the end of the conical structure with the largest diameter is connected to the base via an arc-shaped structure. The arc-shaped structure can preferentially contact the outer periphery of the end of the core, thereby tightening the end of the core.

[0017] In one embodiment, there are multiple leveling rollers, which are symmetrically arranged about the axis of the core. This accelerates the leveling efficiency of the tabs and makes the leveling effect of the tabs more uniform.

[0018] In one embodiment, the material of the kneading wheel includes one or more of the following: metal kneading wheel, inorganic non-metal kneading wheel, metal-inorganic non-metal wheel kneading wheel, and organic polymer kneading wheel.

[0019] In one embodiment, the surface of the kneading roller is coated with a wear-resistant layer. This further enhances the wear resistance and corrosion resistance of the kneading roller and reduces its coefficient of friction.

[0020] In one embodiment, the wear-resistant layer includes one or more of the following: hard chrome plating, electroless nickel plating, titanium nitride coating, diamond-like carbon coating, tungsten carbide coating, and ceramic coating. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 (a) is a block diagram of the kneading and flattening device provided in an embodiment of the present invention;

[0023] Figure 1(b) is a block diagram of the electrode provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the winding core provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the flattened core and the flattening wheel provided in an embodiment of this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the bent portion of the electrode lug before bending, provided in an embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the bent portion of the electrode lug provided in an embodiment of the present invention after bending.

[0028] Figure 6 This is a schematic diagram of the kneading wheel provided in an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 3. Kneading device; 2. Pre-folding component; 1. Kneading wheel; 10. Kneading section; 12. Conical structure; 20. Base; 30. Arc-shaped structure; 11. First part; 13. Second part; 15. Third part;

[0031] 9. Core; 91. Tab; 92. Connector; 93. Bending section; 94. Composite layer; 941. Positive electrode sheet; 943. Negative electrode sheet; 942. Separator;

[0032] p1, First Angle. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] In cylindrical batteries, the tabs are crucial components connecting the internal electrodes (positive and negative) to the external circuitry. Tab forming is one of the key processes in battery manufacturing, and its quality directly impacts the battery's electrical performance, safety, and reliability. To further improve the quality of tab forming, it is necessary to optimize the physical morphology and structural stability of the tabs to ensure the reliability and overall performance of subsequent battery processes.

[0035] In related technologies, the tabs parallel to the core axis are flattened by a flattening roller. During this process, a large frictional force is generated between the tabs and the flattening roller, which easily produces metal shavings.

[0036] Firstly, this application provides a kneading device 3. In some embodiments, please refer to... Figure 1 , Figure 1 (a) is a block diagram of the kneading device. Figure 1 (b) is a block diagram of the tab. The flattening device 3 is used to flatten the tab 91 of the core 9. The tab 91 includes a connecting part 92 and a bending part 93 connected together. The flattening device 3 includes a pre-folding part 2 and a flattening roller 1. Please refer to... Figure 2 , Figure 4 as well as Figure 5 The pre-folding part 2 is used to bend the bent portion 93 of the tab 91 along the axis toward the core 9, so that the bent portion 93 and the connecting portion 92 have a first angle p1. The flattening wheel 1 is used to flatten the bent portion 93 after bending.

[0037] Please combine Figure 4 as well as Figure 5 , Figure 4 The bending portion 93 of the middle tab is not bent. At this time, the bending portion 93 of the tab is parallel to the axis of the core. Figure 5 The bending portion 93 of the middle electrode tab is bent, and the bending portion 93 is bent in the direction toward the axis of the winding core. Figure 5 The middle bend 93 and the connecting part 92 have a first angle p1. Please refer to... Figure 2 as well as Figure 3 , Figure 2 Zhongyu Figure 3 In the image, the dashed line L1-L1 indicates the axis of the core. Figure 2 The bending portion 93 of the middle tab is not bent. At this time, the bending portion 93 of the tab is parallel to the axis of the core. Figure 3The tab 91 is flattened by the flattening wheel 1. In these embodiments, the bent portion 93 is pre-bent along the axis towards the core by the pre-folding member 2, and then the bent portion 93 is flattened by the flattening wheel 1, thereby achieving the flattening of the tab 91 by the flattening device 3. Compared with the related art where the tab parallel to the core axis is directly flattened by the flattening wheel, in the embodiments of this application, the bent portion 93 is pre-bent along the axis towards the core before flattening, which can reduce the friction between the flattening wheel and the bent portion, and thus reduce the amount of metal shavings generated during the friction process.

[0038] In some embodiments, the bent portion 93 may have a first state, a second state, and a flattened state. When the bent portion 93 is in the first state, its extension direction is the axial direction of the core 9. At this time, the bent portion 93 and the connecting portion are in the same direction. Figure 2 as well as Figure 4 , Figure 2 as well as Figure 4 The bent portion 93 is in the first state, and the extension direction of the bent portion 93 is the axial direction of the core 9. When the bent portion 93 is in the second state, please combine... Figure 5 , Figure 5 The bent portion 93 is in the second state, bent along the axis toward the core 9, and has a first angle p1 between the bent portion 93 and the connecting portion 92. The flattening wheel 1 can further bend and flatten the bent portion 93 in the second state. When the bent portion 93 is in the third state, the bent portion 93 is flattened by the flattening wheel 1. Please refer to... Figure 3 , Figure 3 The bent portion 93 is in the third state, at which point the bent portion 93 is flattened.

[0039] In these embodiments, when the bent portion 93 is in the first state, it is pre-folded to bend the bent portion 93 at a first angle p1 along the axis direction closer to the core, thereby placing the bent portion 93 in the second state. The flattening roller 1 flattens the bent portion 93 in the second state, thereby placing the bent portion in the third state. In this process, the bent portion 93 can be flattened using relatively small force.

[0040] It is easy to understand that when the friction between the flattening wheel 1 and the bending portion 93 is large, more metal shavings will be generated during the flattening process. Some of these metal shavings will enter the central hole of the winding core 9, which will affect the performance of the finished battery cell and reduce its energy density. In this embodiment, since the flattening wheel 1 can flatten the bending portion 93 with a smaller force, a smaller friction is generated between the flattening wheel 1 and the bending portion 93. During the flattening process, fewer metal shavings will be generated. Reducing the amount of metal shavings generated during friction reduces the amount of metal shavings entering the central hole of the winding core, thereby ensuring that the finished battery cell has a higher energy density.

[0041] Please combine Figure 5 In some implementations, the first angle p1 is in the range of 0°-90°, for example, it can be 0°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 90°.

[0042] Please combine Figure 4 In some embodiments, the core 9 is formed by winding a composite layer 94, and the height D1 of the bend 93 satisfies:

[0043] D1 = at,

[0044] Where a is the number of weldable layers of the tab, and t is the thickness of the composite layer.

[0045] In some examples, the composite layer 94 includes an electrode and a separator 942. The electrode includes a positive electrode 941 and a negative electrode 943. The composite layer 94 is formed by sequentially stacking one separator 942, a negative electrode 943, another separator 942, and a positive electrode 941. The positive electrode 941 and the negative electrode 943 may each contain a current collector and an active layer. For example, the negative electrode has a single-sided region (the active layer is coated on only one side) and a double-sided region (the active layer is coated on both sides), and the two meet to form a boundary region. The active layer of the positive electrode has a corresponding recessed region to match the position of the boundary region, thereby alleviating the core expansion. The separator is placed between the positive and negative electrodes to provide isolation. Furthermore, the electrode is the main body for the electrochemical reaction of the battery, consisting of a current collector and an active material layer (including positive electrode material, negative electrode material, binder, conductive agent, etc.) coated on its surface. The active material layer stores charge through the insertion / extraction of lithium ions, which is the core source of battery energy density. The current collector acts as the "substrate" of the active material, supporting the coating and conducting current. The tab is an "extension" of the current collector, and the tab can be made of the same material as the current collector. The current generated by the electrode can first be gathered by the current collector to the tab, and then conducted to the outside through the tab. The three form a conductive path of "active material → current collector → tab → external circuit".

[0046] The height D1 of the bent portion 93 needs to meet the welding requirements. During welding, there are requirements regarding the number of weldable layers of the tabs 91. During welding, the tabs 91 are stacked along the axial direction of the core 9, and welding to the busbar only occurs when the stacked layers reach a certain thickness in the axial direction. In other words, after the bent portion 93 is flattened, the number of stacked tabs needs to meet the welding requirements; the number of stacked tabs that meets the welding requirements can be called the number of weldable layers of the tabs.

[0047] The height D1 of the bent portion 93 satisfies the condition that D1 = at, which satisfies the welding requirements between the tab 91 and the busbar.

[0048] In actual production applications, the actual height of the bend 93 ranges from (D1-0.3)mm to (D1+0.3)mm.

[0049] The height D1 of the bend 93 ranges from 0mm to 10mm, for example, it can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0050] Please combine Figure 6 In some embodiments, the flattening roller 1 includes a plurality of flattening portions 10, which are arranged along the axial direction of the flattening roller 1. The plurality of flattening portions 10 are each rotatable about the axis of the flattening roller 1, and are used to flatten the tab 91. Figure 6 The dashed line L2-L2 in the middle indicates the axis of the kneading wheel 1.

[0051] In these embodiments, the bending portion 93 is pre-bent toward the axis of the core by the pre-folding member 2, and then the bending portion 93 is flattened by the multiple flattening parts 10 of the flattening wheel 1. By controlling the rotation speed of the multiple flattening parts 10 of the flattening wheel 1, the multiple flattening parts 10 can have different rotation speeds. In use, the rotation speed of the multiple flattening parts 10 can be controlled according to the actual flattening condition of the tab 91, so that the multiple flattening parts 10 and the tab 91 have less friction, thereby reducing the generation of metal chips and making the internal stress of the core relatively small, which can further optimize the state of the end face and the inside of the core.

[0052] In some scenarios, when a large amount of metal debris is found at the flattened tab 91 corresponding to a certain flattened section 10, the winding speed can be slowed down to reduce friction and thus reduce metal debris generation. For cylindrical batteries, in some examples, the core can be wound from a composite layer of two separators, a positive electrode, and a negative electrode. After winding, the winding needle is removed, leaving a central hole where the needle was. Reducing metal debris generation also reduces the amount of metal debris entering the central hole.

[0053] In some embodiments, to enable the multiple kneading sections 10 to rotate around the axis of the kneading wheel 1 respectively, the kneading device 3 may include multiple motors and multiple rotating shafts, with one kneading section 10 corresponding to one motor and one kneading section 10 corresponding to one rotating shaft, and the multiple rotating shafts being coaxially nested. For example, when the multiple kneading sections 10 include a first section 11, a second section 13, and a third section 15, the kneading device 3 may include three motors and a first rotating shaft, a second rotating shaft, and a third rotating shaft, wherein the first rotating shaft, the second rotating shaft, and the third rotating shaft are coaxially nested. For example, the first rotating shaft and the second rotating shaft may be hollow shafts, and the third rotating shaft may be a solid shaft. The second rotating shaft may be sleeved on the outer circumference of the third rotating shaft, and the first rotating shaft may be sleeved on the outer circumference of the second rotating shaft. The first rotating shaft, the second rotating shaft, and the third rotating shaft are each independently driven by a motor. The third rotating shaft drives the third section 15 to rotate, the second rotating shaft drives the second section 13 to rotate, and the first rotating shaft drives the first section 11 to rotate. Furthermore, the first rotating shaft can be connected to the second rotating shaft via bearings, and the second rotating shaft can be connected to the third rotating shaft via bearings, thereby achieving contactless rotation between the first, second, and third rotating shafts and avoiding interference. The motor can be a servo motor or a stepper motor, etc. This configuration allows the speeds of the first part 11, the second part 13, and the third part 15 to be independently adjustable, with high control precision and fast response speed.

[0054] In this embodiment of the application, the kneading roller 1 may include two kneading parts 10, three kneading parts 10, or four kneading parts 10.

[0055] In some embodiments, to facilitate the flattening of the core 9 by the flattening roller 1, the length of the flattening roller can be equivalent to the radius of the core 9. In one example, the diameter of the core 9 can be 32 mm, then the length of the flattening roller can be configured to be 16 mm.

[0056] In some embodiments, the multiple flattening portions 10 include a first portion 11, a second portion 13, and a third portion 15. The second portion 13 is disposed between the first portion 11 and the second portion 13. When the flattening roller 1 flattens the tabs 91 of the core 9, the first portion 11, the second portion 13, and the third portion 15 are arranged outward in sequence along the radial direction of the core 9.

[0057] By controlling the rotation speed through the three sections of the first part 11, the second part 13, and the third part 15, the friction of the flattening roller 1 on the electrode tab 91 during flattening can be reduced, thereby reducing the stress on the electrode tab 91 and the stress on the core 9.

[0058] Furthermore, as the flattening roller 1 flattens the tabs, the tabs 91 are more prone to becoming disordered when the stress on the core 9 is relatively high. When the stress on the core 9 is relatively low, the tabs are less likely to become disordered. To better support the tabs, the exposed height of the tabs needs to be greater, specifically the height above the diaphragm. Thus, when the stress on the core 9 is relatively low, the exposed height of the tabs can be reduced. When the exposed height of the tabs is reduced, the height of the contact area between the diaphragm and the electrode plates can be increased, which will increase the electrolyte capacity and the energy density of the battery cell.

[0059] Please combine Figure 6 In some embodiments, the flattening portion 10 is configured as three parts: a first part 11, a second part 13, and a third part 15. When the flattening wheel flattens the tab 91 of the core 9, the first part 11, the second part 13, and the third part 15 are arranged radially outward along the core 9. Thus, during flattening, the first part 11, the second part 13, and the third part 15 flatten the tab 91 radially along the core 9. That is, the first part 11 is used to flatten the position of the tab near the center hole, and the third part 15 is used to flatten the position of the tab away from the center hole.

[0060] In some scenarios, the bent portion 93 is pre-bent towards the axis of the core by a first angle p1 using the pre-folding component 2, and then the bent portion 93 is flattened by the flattening wheel 1. When the first angle p1 is greater than 0 degrees and less than 90 degrees, for example, the first angle p1 can be 30 degrees or 45 degrees, during flattening, the first part 11 will contact the bent portion 93 first, the second part 13 will contact the bent portion 93 later than the first part 11, and the third part 15 will contact the bent portion 93 last. The rotation speed of the first part 11 is controlled to be greater than the rotation speed of the second part 13. In this way, the bent portion 93 that contacts the flattening wheel 1 first (i.e., the part of the bent portion 93 that contacts the first part 1 first) can be pressed down quickly, which makes it easier for the second part 13 and the third part 15 to contact the bent portion 93 more quickly, and can reduce the friction between the flattening wheel 1 and the bent portion 93 during the flattening process.

[0061] Please combine Figure 6 In some embodiments, multiple flattened portions 10 form a conical structure 12, and the diameter of the flattened portions 10 gradually increases as they move away from the axis of the core 9.

[0062] Please combine Figure 6 In some embodiments, the first portion 11, the second portion 13, and the third portion 15 form a conical structure 12, wherein the diameter of the conical structure 12 gradually increases along the direction from the first portion 11 to the third portion 15.

[0063] In some embodiments, the apex angle n1 of the conical structure 12 ranges from 20° to 80°. For example, it can be 20°, 30°, 40°, 50°, 60°, 70°, or 80°. In some embodiments, the base diameter φ1 of the conical structure 12 ranges from 10mm to 50mm. For example, it can be 10mm, 20mm, 30mm, 40mm, or 50mm. In some embodiments, the height A1 of the conical structure 12 ranges from 10mm to 100mm. For example, it can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm.

[0064] In some embodiments, the maximum length A2 of the first part 11 along the axial direction of the kneading roller 1 ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0065] In some embodiments, the maximum length A3 of the second part 13 along the axial direction of the kneading wheel ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0066] In some embodiments, the maximum length A4 of the third part 15 along the axial direction of the kneading wheel ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0067] Please combine Figure 6 In some embodiments, the kneading wheel 1 includes a base 20, and the end of the conical structure 12 with the largest diameter is connected to the base 20 via an arc-shaped structure 30. The arc-shaped structure 30 can be an arc-shaped rounded corner.

[0068] In order to tighten the end of the core, the flattening roller can be provided with an arc-shaped structure 30. The arc-shaped structure 30 can preferentially contact the outer periphery of the end of the core 9 to tighten the end of the core 9 and improve the product yield.

[0069] Please combine Figure 3 In some embodiments, there are multiple flattening rollers 1, which are symmetrically arranged about the axis of the core 9. This can speed up the flattening efficiency of the tabs and make the flattening effect of the tabs more uniform.

[0070] In some embodiments, to improve the hardness and wear resistance of the smoothing wheel, the smoothing wheel 1 includes one or more of the following: a metal smoothing wheel, an inorganic non-metallic smoothing wheel, a metal-inorganic non-metallic smoothing wheel, and an organic polymer smoothing wheel. The metal smoothing wheel can be an alloy steel smoothing wheel, such as a mold steel smoothing wheel, specifically a stainless steel smoothing wheel. The inorganic non-metallic smoothing wheel can specifically be a ceramic smoothing wheel. The metal-inorganic non-metallic composite smoothing wheel can specifically be a tungsten steel smoothing wheel, wherein tungsten steel is mainly composed of hard compounds such as tungsten carbide, bonded with metals (such as cobalt) and sintered, belonging to a ceramic-metal composite material. The organic polymer smoothing wheel can specifically be a PVC smoothing wheel, wherein PVC (polyvinyl chloride)...

[0071] In some examples, the flattening wheel is a ceramic flattening wheel, which is made of ceramic material because ceramic material is relatively smooth and can further reduce friction between the tab and the flattening wheel 1.

[0072] In some embodiments, the surface of the kneading roller 1 is covered with a wear-resistant layer.

[0073] In some embodiments, the wear-resistant layer includes one or more of the following: hard chrome plating, electroless nickel plating, titanium nitride (TiN) coating, diamond-like carbon coating, tungsten carbide (WC) coating, and ceramic coating, thereby further enhancing the wear resistance and corrosion resistance of the squeegee and reducing its coefficient of friction.

[0074] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A kneading and smoothing device (3), characterized in that, The tabs (91) of the core (9) are used to flatten the core (9), the tabs (91) including a connecting part (92) and a bending part (93) connected to each other, and the flattening device (3) includes: A pre-folding member (2) for bending the bent portion (93) along the axis toward the core, such that the bent portion (93) and the connecting portion (92) have a first angle (p1); and Flattening wheel (1), which is used to flatten the bent part (93) after bending.

2. The kneading and leveling device according to claim 1, characterized in that, The first angle (p1) ranges from 0° to 90°.

3. The kneading and leveling device according to claim 1, characterized in that, The core (9) is formed by winding a composite layer (94), and the height D1 of the bent portion (93) satisfies: D1 = at, Where a is the number of weldable layers of the tab, and t is the thickness of the composite layer.

4. The kneading and leveling device according to any one of claims 1 to 3, characterized in that, The kneading wheel (1) includes multiple kneading parts (10), which are arranged along the axial direction of the kneading wheel (1). The multiple kneading parts (10) can rotate around the axis of the kneading wheel (1) respectively, and are used to knead the tab (91).

5. The kneading and leveling device according to claim 4, characterized in that, The multiple flattened portions (10) form a conical structure (12), and the diameter of the flattened portions (10) gradually increases as they move away from the axis of the core (9).

6. The kneading and leveling device according to claim 5, characterized in that, The kneading wheel (1) includes a base (20), and the end of the conical structure (12) with the largest diameter is connected to the base (20) through an arc structure (30).

7. The kneading and leveling device according to any one of claims 1 to 3, characterized in that, The number of the kneading rollers (1) is multiple, and the multiple kneading rollers (1) are arranged symmetrically about the axis of the core (9).

8. The kneading and leveling device according to any one of claims 1 to 3, characterized in that, The kneading wheel (1) includes one or more of the following: metal kneading wheel, inorganic non-metal kneading wheel, metal-inorganic non-metal wheel kneading wheel, and organic polymer kneading wheel.

9. The kneading and leveling device according to any one of claims 1 to 3, characterized in that, The surface of the kneading wheel (1) is covered with a wear-resistant layer.

10. The kneading and leveling device according to claim 9, characterized in that, The wear-resistant layer includes one or more of the following: hard chrome plating, electroless nickel plating, titanium nitride coating, diamond-like carbon coating, tungsten carbide coating, and ceramic coating.

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