Pole piece flattening device and pole piece coating device

Abstract

The invention is applicable to the technical field of power batteries, and provides a pole piece flattening device and a pole piece coating device, and the pole piece coating device comprises a compression roller which can be pressed on a pole piece and can rotate along with the displacement of the pole piece; the damping device comprises a first transmission part and a damping assembly; the first transmission part can rotate along with the pressing roller; the damping assembly is arranged on the side of the first transmission part and can apply resistance to the first transmission part; according to the pole piece flattening device, the first transmission part capable of rotating along with the pressing roller and the damping assembly capable of providing resistance for the first transmission part are arranged to reduce the rotating speed of the pressing roller, so that the pressing roller can apply correction force opposite to the movement direction of the pole piece to the pole piece; the pole piece is stretched through the component force of the correcting force in the direction perpendicular to the pole piece, so that the problem of wrinkling of the pole piece is solved, and meanwhile, the component force of the correcting force can drive the pole piece to move, so that the problem of skewing of the pole piece is solved, and the yield of the pole piece is improved.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and particularly relates to a pole piece flattening device and a pole piece coating device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the structure of a battery, the pole piece is an important component. Active substances need to be coated on the pole piece, and during the process of coating the active substances on the pole piece, the pole piece is prone to skew, wrinkles, etc., which can easily affect the yield of the pole piece. Summary of the Invention

[0004] In view of the above problems, this application provides a pole piece flattening device and a pole piece coating device, which alleviate the problems of easy skew and wrinkles of the pole piece.

[0005] In a first aspect, an embodiment of this application provides a pole piece flattening device, including:

[0006] A pressing roller that can press on the pole piece and can rotate as the pole piece moves;

[0007] A damping device, including a first transmission member and a damping component;

[0008] The first transmission member can rotate with the pressing roller; the damping component is arranged beside the first transmission member, and the damping component can apply a resistance to the first transmission member.

[0009] In the technical solution of this embodiment, a first transmission member that can rotate with the pressing roller is provided, and a damping component that can provide a resistance to the first transmission member is provided to reduce the rotation speed of the pressing roller, so that the pressing roller can apply a corrective force opposite to the movement direction of the pole piece to the pole piece, and stretch the pole piece through the component force of this corrective force in the direction perpendicular to the pole piece to alleviate the problem of pole piece wrinkles. At the same time, the component force of this corrective force can also drive the pole piece to move to alleviate the problem of pole piece skew, so as to improve the yield of the pole piece.

[0010] In some embodiments, the damping component has at least two different states to apply different magnitudes of resistance to the first transmission member.

[0011] In the technical solution of this embodiment, the damping assembly includes at least two different states, and different states apply different resistive forces to the first transmission member, so that the first transmission member can provide different resistive forces to the pressure roller, and the pressure roller can have different deceleration effects on the pole piece, so that the damping device can adapt to different skewing and wrinkling conditions of the pole piece, thereby improving the correction ability of the damping device.

[0012] In some embodiments, the material of the first transmission member includes a magnetically conductive material, and the damping assembly can form a magnetic field around the first transmission member;

[0013] When the first transmission member rotates in the magnetic field, a closed current can be formed inside the first transmission member.

[0014] In the technical solution of this embodiment, the first transmission member is made of a magnetically conductive material, and the damping assembly provides resistance to the first transmission member through the magnetic field. Compared with structures such as brake pads that directly contact the workpiece to provide resistance, using the magnetic field to provide resistance can provide buffering for the deceleration of the first transmission member, reducing situations such as sudden increase in structural load and sudden change in the force on the pole piece caused by the sudden reduction in direct contact speed, so as to improve the service life and stability of the structure in the damping device, and at the same time, it can also reduce the possible negative impacts on the pole piece.

[0015] In some embodiments, the first transmission member includes an annular member, so that when the first transmission member rotates in the magnetic field, an annular closed current can be formed inside the first transmission member.

[0016] In the technical solution of this embodiment, the first transmission member is an annular member, so that when the first transmission member moves in the magnetic field, it is easier for a stable closed current to be formed along the shape of the annular member inside it, so that the magnetic field can provide resistance to the first transmission member more stably.

[0017] In some embodiments, the damping assembly includes a first magnet and a second magnet disposed on opposite sides of the first transmission member, and the first magnet can move relative to the second magnet.

[0018] The technical solution of this embodiment provides some specific structures of the damping assembly, so that the damping assembly can provide a magnetic field around the first transmission member, and the first transmission member can form an induced current during movement, so that the damping assembly can provide resistance to the first transmission member more stably; the first magnet can move relative to the second magnet, so that the damping assembly can provide magnetic fields with different magnetic field intensities, so as to provide different resistive forces to the first transmission member, and the pressure roller can have different speeds to adapt to different skewing and wrinkling conditions of the pole piece.

[0019] In some embodiments, the first magnet can rotate relative to the second magnet, and the first magnet has different magnetic poles in the circumferential direction of its rotation axis, so as to change the projected area of different magnetic poles of the first magnet on the different magnetic poles of the second magnet.

[0020] In the technical solution of this embodiment, the first magnet can rotate relative to the second magnet to change the projected area of the magnetic poles of the first magnet on the different magnetic poles of the second magnet, thereby changing the intensity of the magnetic field formed between the first magnet and the second magnet, and changing the resistance provided by the magnetic field to the first transmission member, so as to achieve the effect of providing different resistances to the first transmission member through the damping assembly.

[0021] In some embodiments, the first magnet includes a first part and a second part with different magnetic properties, the second magnet includes a third part and a fourth part with different magnetic properties, and the magnetic properties of the third part and the first part are different;

[0022] Along the circumferential direction of the rotation axis of the first magnet, the first part and the second part are arranged in sequence, and the third part and the fourth part are arranged in sequence.

[0023] The technical solution of this embodiment provides some specific structures of the first magnet and the second magnet, so that the first magnet includes the first part and the second part arranged in sequence along its circumferential direction, and the second magnet includes the third part and the fourth part arranged in sequence along the circumferential direction of the first magnet, so that the rotation of the first magnet relative to the second magnet can change the projected area of the first part on the third part, thereby changing the intensity of the magnetic field formed between the first magnet and the second magnet, and changing the resistance provided by the magnetic field to the first transmission member, so as to achieve the effect of providing different resistances to the first transmission member through the damping assembly.

[0024] In some embodiments, the damping device further includes a second transmission member drivingly connected to the first transmission member, and the second transmission member is drivingly connected to the pressure roller.

[0025] In the technical solution of this embodiment, the first transmission member is drivingly connected to the pressure roller through the second transmission member, which is convenient for the layout of the structure and alleviates problems such as narrow installation space caused by directly connecting the first transmission member to the pressure roller.

[0026] In some embodiments, the second transmission member is in contact with the pressure roller and can rotate with the pressure roller through friction.

[0027] In the technical solution of this embodiment, the second transmission member is in contact with the pressure roller, so that the pressure roller drives the second transmission member to rotate through friction. Compared with methods such as gear transmission, using friction transmission can provide buffering for the damping device and the pressure roller to reduce the possible negative impacts caused by sudden increases in load due to sudden changes in resistance received by the first transmission member.

[0028] In some embodiments, the second transmission member includes a base and a damping component arranged around the base, the base is connected to the first transmission member, and the damping component is in contact with the pressure roller and can rotate with the pressure roller through friction.

[0029] The technical solution of this embodiment provides some specific structures of the second transmission member, so that the second transmission member is connected to the first transmission member through the base, and is connected to the pressure roller through the damping component; because the damping component is connected to the pressure roller through friction, this arrangement is likely to lead to a shorter life of the damping component, so the second transmission member includes a base and a damping component so that the damping component can be replaced separately, so as to improve the overall life of the damping device.

[0030] In some embodiments, the material of the damping member includes at least one of a rubber-based material, a carbon fiber material, a resin-based material, or a semi-metallic material.

[0031] The technical solution of this embodiment provides some specific materials for the damping components so that there can be greater friction between the damping components and the pressure roller, so that the damping components can better rotate synchronously with the pressure roller and can reduce the sliding friction between the damping components and the pressure roller.

[0032] In some embodiments, in the axial direction of the pressure roller, the size of the contact surface between the second transmission member and the pressure roller ranges from 3 mm to 20 mm.

[0033] The technical solution of this embodiment provides a width range of the second transmission member so that the second transmission member can better provide resistance to the pressure roller, while also reducing the space requirement of the second transmission member, thereby reducing the overall volume and weight of the damping device.

[0034] In some embodiments, the damping device further comprises a housing, the second transmission member is disposed outside the housing, and the first transmission member and the damping structure are accommodated in the housing.

[0035] In the technical solution of this embodiment, the damping device also includes a shell, and the shell accommodates the first transmission member and the damping structure to play a role in the first transmission member and the damping structure; at the same time, the second transmission member is outside the shell to facilitate the second transmission member to be connected to the pressure roller.

[0036] In some embodiments, the pole piece flattening device includes at least one pressing roller, and at least one damping device can be provided on the circumference of any pressing roller.

[0037] In the technical solution of this embodiment, the damping device can be arranged on the side of any pressure roller as needed, or can be arranged on the sides of several pressure rollers respectively; at the same time, only one damping device can be arranged on the side of each pressure roller, or multiple damping devices can be arranged to meet the different needs of different working conditions.

[0038] In some embodiments, the damping device further includes a bracket, which is detachably arranged beside any one of the pressing rollers.

[0039] In the technical solution of this embodiment, the damping device can be detachably arranged beside any one of the pressing rollers through the bracket, so that the staff can change the position of the damping device according to the actual working conditions, improving the flexibility of the damping device in use and reducing the cost.

[0040] In a second aspect, some embodiments of the present application further provide a pole piece coating device, including:

[0041] A pressing roller capable of pressing on the pole piece, and the pressing roller can rotate along with the displacement of the pole piece;

[0042] A damping device including a first transmission member and a damping component;

[0043] The first transmission member can rotate along with the pressing roller; the damping component is arranged beside the first transmission member, and the damping component can apply a resistance to the first transmission member.

[0044] In the technical solution of this embodiment, a first transmission member capable of rotating along with the pressing roller is provided, and a damping component capable of providing a resistance to the first transmission member is provided to reduce the rotation speed of the pressing roller, so that the pressing roller can apply a correcting force opposite to the moving direction of the pole piece to the pole piece, and stretch the pole piece through the component force of this correcting force in the direction perpendicular to the pole piece to relieve the problem of pole piece wrinkling. At the same time, the component force of this correcting force can also drive the pole piece to move to relieve the problem of pole piece skew, so as to improve the yield rate of the pole piece.

[0045] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a top view schematic diagram of the pole piece flattening device provided by some embodiments of the present application.

[0048] Figure 2 For Figure 1 The partial enlarged schematic diagram at A in

[0049] Figure 3A cross-sectional schematic view of a damping device provided by some embodiments of the present application.

[0050] Figure 4 A three-dimensional schematic view of a bracket in a damping device provided by some embodiments of the present application.

[0051] The meanings of the markings in the figure are as follows:

[0052] 100. Damping device;

[0053] 10. First transmission member;

[0054] 20. Damping assembly; 21. First magnet; 211. First part; 212. Second part; 22. Second magnet; 221. Third part; 222. Fourth part; 23. Housing; 24. Bracket;

[0055] 30. Second transmission member; 31. Base; 32. Damping member;

[0056] 200. Pole piece flattening device;

[0057] 40. Press roller;

[0058] 50. Pole piece; 51. Blank area; 52. Coated area. Detailed implementation manners

[0059] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and should not be used to limit the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0062] References to "embodiments" in this specification mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0064] In the description of the embodiments of the present application, the term "plural" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0065] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0067] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0068] In the structure of a battery, the electrode assembly is an important component, and the electrode assembly is usually formed by winding a pole piece and a separator. Among them, the active material needs to be coated on the pole piece to form a coating area, and a blank area where the active material is not coated also needs to be left. During the pole piece coating process, a flattening device is usually set, and the pressure roller of the flattening device is used to flatten the active material coated on the pole piece and flatten the blank area. The pressure roller is usually a passive roller and rotates synchronously with the advancement of the pole piece. The pressure roller is used to make the active material evenly and smoothly distributed, and is also used to reduce the wrinkles in the blank area.

[0069] In the current pole piece coating device and pole piece flattening device, as the pole piece advances and the operation time increases, the pressure roller is prone to gradually displace and skew under the action of the pole piece, and the pole piece is also prone to skew and other situations. These situations are likely to cause the pressure exerted by the pressure roller on the pole piece to become uneven, resulting in uneven distribution of the active material on the pole piece and causing the pole piece to be uneven, and also likely to have a negative impact on the flattening of the wrinkles in the blank area.

[0070] To alleviate the problems of pressure roller displacement and pole piece skew, the pressure roller can be set as a floating roller. For example, structures such as a spherical plain bearing and a floating part are introduced on the pressure roller. The outer surface of the spherical plain bearing is spherical, and the floating part can swing within a certain range centered on the spherical plain bearing, so that the uneven pole piece can be attached to the pressure roller, reducing the occurrence of pole piece skew and also reducing the overall skew of the pressure roller. However, this structure has a poor ability to flatten the pole piece, and it is not easy to make the active material on the pole piece evenly and smoothly distributed, nor is it easy to flatten the wrinkles in the blank area.

[0071] To alleviate the problems of pressure roller displacement, skew and pole piece skew, structures such as a hydraulic cylinder, a pneumatic cylinder, and a connecting shaft can also be set on the pressure roller to facilitate the adjustment of the position of the pressure roller and reduce the displacement and skew of the pressure roller. However, this structure has a high space requirement, and is not easy to install, disassemble and replace, and has a high use cost. And when flattening the wrinkles, the pressure of this structure on the pole piece is not easy to control. If the applied pressure is large, it is easy to reduce the tolerance of the pole piece current collector, pinch the blank area of the pole piece, which is not conducive to the elimination of wrinkles, and is prone to break the belt during other subsequent operations of the pole piece; if the applied pressure is small, the flattening effect on the wrinkles in the blank area is poor.

[0072] Based on the above considerations, to alleviate the problems of pressure roller displacement, skew and pole piece skew, some embodiments of the present application provide a damping device beside the pressure roller, so that the first transmission member can rotate with the pressure roller, and the damping assembly can apply a resistance to the first transmission frame, so as to apply a resistance to the pressure roller through the first transmission member.

[0073] Under the action of the damping device, a sliding friction can be formed between the pressure roller and the pole piece, so that the pressure roller can apply a corrective force to the pole piece in a direction opposite to the movement direction of the pole piece; the component force of the corrective force in the direction perpendicular to the pole piece can stretch the pole piece to relieve the problem of pole piece wrinkling, and at the same time, the other component force of the corrective force can drive the pole piece to move to relieve the problem of pole piece skew. When the pole piece is skewed, the pressure roller is displaced or skewed, the damping device can be started to correct the position of the pole piece and flatten the pole piece, so as to improve the yield rate of the pole piece and improve the production efficiency.

[0074] The damping device disclosed in the present application can be used in various devices with the function of flattening the pole piece, for example, it can be applied to a pole piece coating device, a pole piece flattening device or other devices.

[0075] For the convenience of description in the following embodiments, a damping device 100 of an embodiment of the present application applied to a pole piece flattening device 200 is taken as an example for description.

[0076] Reference Figure 1 , Figure 1 is a top view schematic diagram of a pole piece flattening device 200 provided in some embodiments of the present application. The pole piece flattening device 200 is used to flatten the active material on the current collector of the pole piece 50. The current collector can be a sheet structure of copper foil, aluminum foil or other materials; the active material can be lithium manganate, lithium cobaltate, lithium nickel cobalt manganate, graphite or other materials; the pole piece flattening device 200 is also used to flatten the pole piece 50 to reduce the wrinkles on the pole piece 50; according to the type of the active material, the pole piece 50 can be a positive pole piece or a negative pole piece. The pole piece flattening device 200 can include a pressure roller 40, and the pressure roller 40 is used to flatten the active material coated on the pole piece 50 and flatten the blank area 51. The pressure roller 40 is a passive roller and synchronizes with the movement of the pole piece 50. The pressure roller 40 is used to make the active material evenly distributed and also used to reduce the wrinkles in the blank area 51.

[0077] In a first aspect, some embodiments of the present application provide a pole piece flattening device 200. Reference Figure 1 、 Figure 2 , wherein, Figure 1 is a top view schematic diagram of a pole piece flattening device 200 provided in some embodiments of the present application, Figure 2 is Figure 1 a partial enlarged schematic diagram at position A in

[0078] Some embodiments of the present application provide a pole piece flattening device 200, comprising a damping device 100 and a pressure roller 40; the pressure roller 40 can be pressed on the pole piece 50, and the pressure roller 40 can rotate with the displacement of the pole piece 50; the damping device 100 is applied to the pressure roller 40, and the damping device 100 comprises a first transmission member 10 and a damping assembly 20; wherein, the first transmission member 10 can rotate with the pressure roller 40; the damping assembly 20 is arranged on the side of the first transmission member 10, and the damping assembly 20 can apply resistance to the first transmission member 10.

[0079] The pressure roller 40 refers to a structure in the pole piece flattening device 200 for rolling the pole piece 50. The pressure roller 40 is used to flatten the active material in the coating area 52 of the pole piece 50 to improve the uniformity of the active material and the flatness of the pole piece 50. The pressure roller 40 is also used to flatten the wrinkles in the blank area 51 of the pole piece 50 to improve the flatness of the pole piece 50. The material of the pressure roller 40 can be plastic, metal or other materials.

[0080] The pressure roller 40 can rotate with the displacement of the pole piece 50 , that is, the pressure roller 40 is a passive roller, and the movement of the pole piece 50 can drive the pressure roller 40 to rotate accordingly. At this time, there is rolling friction between the pressure roller 40 and the pole piece 50 .

[0081] The first transmission member 10 refers to a structure in the damping device 100 that is transmission-connected to the pressure roller 40 . The first transmission member 10 may be made of plastic, metal or other materials.

[0082] The first transmission member 10 can be directly connected to the pressure roller 40; for example, the first transmission member 10 can directly contact the pressure roller 40, so that the rotation of the pressure roller 40 can drive the first transmission member 10 to rotate through friction. At this time, the first transmission member 10 can be a friction wheel or other wheel-shaped structure; for another example, the first transmission member 10 can also be a gear, and a corresponding gear can be set on the pressure roller 40, so that the pressure roller 40 can drive the first transmission member 10 to rotate.

[0083] The first transmission member 10 can also be indirectly connected to the pressure roller 40; for example, an idler wheel can be set between the first transmission member 10 and the pressure roller 40. At this time, according to the structure of the first transmission member 10, the idler wheel can be a friction wheel, a gear or other structure; for another example, the first transmission member 10 can also be a pulley, a sprocket or other structure. At this time, the pressure roller 40 can drive the first transmission member 10 to rotate through a synchronous belt, a chain or other structure.

[0084] The damping device 100 refers to the structure in the damping device 100 that can provide resistance to the first transmission member 10. The damping device 100 can provide resistance by directly contacting the first transmission member 10. For example, the damping device 100 can include a telescopic cylinder and a brake pad, and the telescopic cylinder can make the brake pad abut against the first transmission member 10 to provide resistance; the resistance device can also provide resistance to the first transmission member 10 indirectly. For example, the damping device 100 can include an electromagnetic generating structure, and the electromagnetic generating structure can generate electromagnetic force to provide resistance to the first transmission member 10.

[0085] The damping assembly 20 can provide resistance to the first transmission member 10 to reduce the rotation speed of the first transmission member 10, and the reduction of the rotation speed of the first transmission member 10 can drive the rotation speed of the pressure roller 40 to decrease synchronously. Since the pressure roller 40 rotates as the pole piece 50 advances, at this time, a rolling friction is formed between the pressure roller 40 and the pole piece 50. When the rotation speed of the pressure roller 40 decreases, the pressure roller 40 slides relative to the pole piece 50, and at this time, a sliding friction is also formed between the pressure roller 40 and the pole piece 50. This sliding friction can apply a force opposite to the advancing direction of the pole piece 50 to the pole piece 50, and this force is called the correction force.

[0086] When the pressure roller 40 is displaced, skewed or the pole piece 50 is skewed or wrinkled, an angle will appear between the force of the pressure roller 40 on the pole piece 50 and the advancing direction of the pole piece 50. At this time, the damping device 100 can be started to provide resistance to the rotation of the pressure roller 40, so that the pressure roller 40 can apply a correction force to the pole piece 50. The component force of the correction force perpendicular to the direction of the pole piece 50 can stretch the pole piece 50 to relieve the wrinkles of the pole piece 50 and play a role in flattening the wrinkles of the pole piece 50. The other component force of the correction force can drive the pole piece 50 to move to relieve the problem of displacement of the pole piece 50 and play a role in correcting the position of the pole piece 50.

[0087] At the same time, the pressure roller 40 with a reduced rotation speed can also reduce the advancing speed of the pole piece 50 to facilitate the correction of the position of the pole piece 50 and relieve the skew of the pole piece 50.

[0088] During the coating process of the electrode sheet 50, due to negative impacts such as the difference in the levelness between the pressure roller 40 and the pressing roller 40, and the deviation correction difference of the electrode sheet 50, the electrode sheet 50 is prone to tilt to one side and is likely to form wrinkles. Therefore, in this embodiment, a first transmission member 10 that can rotate with the pressure roller 40 is provided, and a damping assembly 20 that can provide resistance to the first transmission member 10 is provided to reduce the rotation speed of the pressure roller 40, so that the pressure roller 40 can apply a correcting force opposite to the moving direction of the electrode sheet 50 to the electrode sheet 50, and stretch the electrode sheet 50 through the component force of this correcting force in the direction perpendicular to the electrode sheet 50 to alleviate the problem of wrinkles of the electrode sheet 50. At the same time, the component force of this correcting force can also drive the movement of the electrode sheet 50 to alleviate the problem of skew of the electrode sheet 50, so as to improve the yield of the electrode sheet 50; at the same time, the setting of the first transmission member 10 can also reduce the occurrence of situations such as the shortened service life of the pressure roller 40 and the difficulty in installation that may be caused by the direct contact between the damping assembly 20 and the pressure roller 40.

[0089] In some embodiments, the damping assembly 20 includes at least two different states to apply different resistances to the first transmission member 10.

[0090] The different states of the damping assembly 20 can refer to the relative position between the damping assembly 20 and the first transmission member 10, or can refer to different states of the damping assembly 20 itself. The damping assembly 20 can have two different states, or can have three or more different states; when the damping assembly 20 is in different states, the damping assembly 20 can provide different resistances to the first transmission member 10.

[0091] According to the different structures of the damping assembly 20, the damping assembly 20 can change the magnitude of the resistance in different ways. In some embodiments, the damping assembly 20 includes a telescopic cylinder and a brake pad. The telescopic cylinder can make the brake pad abut against the first transmission member 10 to provide resistance. At this time, different states of the damping assembly 20 refer to different extended lengths of the telescopic cylinder. The damping assembly 20 can have different lengths in different states to adjust the pressure of the brake pad abutting against the first transmission member 10 by controlling the extended length, so as to adjust the magnitude of the frictional force between the brake pad and the first transmission member 10, achieving the effect of adjusting the magnitude of the resistance. In other embodiments, the damping device 100 includes an electromagnetic generating structure. The electromagnetic generating structure can generate electromagnetic force to provide resistance to the first transmission member 10. At this time, different states of the damping assembly 20 refer to different magnitudes of the current in the electromagnetic generating structure. The damping assembly 20 has different currents in different states to change the magnitude of the electromagnetic force applied to the first transmission member 10, thus achieving the effect of adjusting the magnitude of the resistance. In still other embodiments, the damping device 100 includes an electromagnetic generating structure. The electromagnetic generating structure can generate electromagnetic force to provide resistance to the first transmission member 10. At this time, different states of the damping assembly 20 refer to the distance between the electromagnetic generating structure and the first transmission member 10. The damping assembly 20 has different distances from the first transmission member 10 in different states to change the magnitude of the electromagnetic force applied to the first transmission member 10. It can be understood that according to the different structures of the damping assembly 20, the ways for the damping assembly 20 to adjust the magnitude of the resistance can also be other ways, not limited to the above ways.

[0092] The damping assembly 20 can apply different magnitudes of resistance to the first transmission member 10, so that the first transmission member 10 can have different accelerations and rotational speeds, and further enable the pressure roller 40 to have different accelerations and rotational speeds. Since the movement of the pole piece 50 drives the rotation of the pressure roller 40, different rotational speeds of the pressure roller 40 have different effects on reducing the traveling speed of the pole piece 50, so that the pressure roller 40 can provide different deceleration effects for different skew degrees and different folding degrees of the pole piece 50, in order to better achieve the effects of correction and flattening.

[0093] In this embodiment, the damping assembly 20 can apply different magnitudes of resistance to the first transmission member 10, so that the first transmission member 10 can provide different magnitudes of resistance to the pressure roller 40, and have different deceleration effects on the pole piece 50 through the pressure roller 40, so that the damping device 100 can adapt to different skew conditions and different folding conditions of the pole piece 50, thereby improving the correction ability of the damping device 100.

[0094] According to some embodiments of the present application, reference Figure 2 、 Figure 3 ,wherein, Figure 2A top view schematic diagram of the pressure roller 40 and the damping device 100 beside it provided by some embodiments of the present application. Figure 3 A cross-sectional schematic diagram of the damping device 100 provided by some embodiments of the present application.

[0095] In some embodiments of the present application, the material of the first transmission member 10 includes a magnetically conductive material, and the damping assembly 20 can form a non-uniform magnetic field around the first transmission member 10; when the first transmission member 10 rotates in the magnetic field, a closed current can be formed inside the first transmission member 10.

[0096] The material of the first transmission member 10 can be iron, steel or other pure metals, the material of the first transmission member 10 can also be an iron-silicon alloy, an iron-aluminum alloy or other alloys, and the material of the first transmission member 10 can also be other materials that are easily magnetized under the action of a magnetic field.

[0097] The damping assembly 20 can form a magnetic field and provide resistance to the rotation of the first transmission member 10 by magnetic force. In some embodiments, the damping assembly 20 can include a permanent magnet, and its material can include ferrite, alnico alloy or other permanent magnetic materials. At this time, the resistance applied by the damping assembly 20 to the first transmission member 10 can be changed by changing the distance between the permanent magnet and the first transmission member 10; in other embodiments, the damping assembly 20 can also include an electromagnet. At this time, the resistance applied by the damping assembly 20 to the first transmission member 10 can be changed by changing the magnitude of the current in the electromagnet.

[0098] The non-uniform magnetic field means that the magnetic field intensities at different positions around the first transmission member 10 are different. For example, the damping assembly 20 can form two or more magnetic fields with different magnetic field intensities around the first transmission member 10; for another example, the damping assembly 20 can also form a magnetic field only in a part of the space around the first transmission member 10, then the magnetic field intensity in other spaces around the first transmission member 10 will be lower or zero, and this setting can also form a non-uniform magnetic field around the first transmission member 10; it can be understood that this non-uniform magnetic field can also be formed by other methods, not limited to the above two.

[0099] When the first transmission member 10 rotates in the magnetic field, a closed current can be formed inside the first transmission member 10, and this current is formed by electromagnetic induction; accordingly, the first transmission member 10 can be a closed ring structure, a disc-shaped structure, or other structures that can form a closed current.

[0100] Since the damping component 20 can form a magnetic field around the first transmission member 10, and the first transmission member 10 can rotate with the rotation of the pressure roller 40, the first transmission member 10 can rotate in the magnetic field and an induced current can be generated inside the first transmission member 10; also, because the current in the first transmission member 10 is formed by induction, and the magnetic field formed by this induced current always hinders the change of the magnetic flux that causes the induced current, as the first transmission member 10 rotates in the non-uniform magnetic field, the first transmission member 10 will always be subject to the resistance of the magnetic field to hinder the change of the current inside it, and this provides resistance to the rotation of the first transmission member 10.

[0101] If a structure such as a brake pad directly contacts the first transmission member 10 to provide resistance, then when the resistance changes, the speed of the first transmission member 10 will change in a short period of time, and the force generated during this process will be borne by the first transmission member 10, the pressure roller 40 and other related structures, resulting in a sudden increase in the structural load, which is likely to cause the structure to deform, crack or even break, and is likely to reduce the service life of the structure; compared with the structure that directly contacts the first transmission member 10 through a structure such as a brake pad, using a magnetic field to provide resistance can make the speed change of the first transmission member 10 more gentle, thereby reducing the impact that the change in resistance may cause to the first transmission member 10, the pressure roller 40 or other structures, so as to protect the structure and improve the service life of the structure.

[0102] In this embodiment, the first transmission member 10 is made of a magnetically conductive material, and the damping component 20 provides resistance to the first transmission member 10 through a magnetic field. Compared with a structure such as a brake pad that directly contacts the workpiece to provide resistance, using a magnetic field to provide resistance can provide buffering for the deceleration of the first transmission member 10, reducing situations such as sudden increase in structural load and sudden change in the force on the pole piece 50 caused by the sudden reduction of direct contact speed, so as to improve the service life and stability of the structures in the damping device 100, and at the same time, it can also reduce the negative impact that may be caused to the pole piece 50.

[0103] Reference Figure 3 , in some embodiments, the first transmission member 10 includes an annular member, so that when the first transmission member 10 rotates in the magnetic field, a circular closed current can be formed inside the first transmission member 10.

[0104] The first transmission member 10 is an annular member so that when the first transmission member 10 moves in the magnetic field, it can more easily form a stable closed current along the shape of the annular member, so that the first transmission member 10 can continuously and relatively stably receive the resistance of the magnetic field in the magnetic field.

[0105] This embodiment makes the first transmission member 10 an annular member, so that when the first transmission member 10 moves in the magnetic field, a stable closed current is more easily formed inside it, so that the magnetic field can more stably provide resistance to the first transmission member 10.

[0106] refer to Figure 3 In some embodiments, the damping assembly 20 includes a first magnet 21 and a second magnet 22 disposed on opposite sides of the first transmission member 10 , and the first magnet 21 can move relative to the second magnet 22 .

[0107] The first magnet 21 refers to a structure in the damping assembly 20 that can generate a magnetic field. The first magnet 21 may include a permanent magnet, and its material may include ferrite, aluminum-nickel-cobalt alloy or other permanent magnetic materials; the first magnet 21 may also include an electromagnet; the shape of the first magnet 21 may be ring-shaped, or bar-shaped, block-shaped or other shapes.

[0108] Similar to the first magnet 21, the second magnet 22 refers to a structure in the damping assembly 20 that can generate a magnetic field. The second magnet 22 may include a permanent magnet, and its material may include ferrite, aluminum-nickel-cobalt alloy or other permanent magnetic materials; the second magnet 22 may also include an electromagnet; the shape of the second magnet 22 may be ring-shaped, or bar-shaped, block-shaped or other shapes.

[0109] The first magnet 21 and the second magnet 22 are respectively disposed on opposite sides of the first transmission member 10 to form a magnetic field between the first magnet 21 and the second magnet 22 and enable the first transmission member 10 to move in the magnetic field.

[0110] The first magnet 21 and the second magnet 22 can have a variety of different relative positions. In some embodiments, the first magnet 21 can be arranged relative to the second magnet 22, and the projections of the first magnet 21 and the second magnet 22 on the first transmission member 10 will not completely cover the first transmission member 10, that is, the magnetic field formed between the first magnet 21 and the second magnet 22 cannot completely cover the first transmission member 10. At this time, part of the first transmission member 10 will be subject to resistance from the magnetic field when entering or leaving the magnetic field; in other embodiments, the first magnet 21 can be arranged relative to the second magnet 22, and the projections of the first magnet 21 and the second magnet 22 on the first transmission member 10 will completely cover the first transmission member 10. The first transmission member 10 is provided with a first magnet 21 and a second magnet 22, and the south pole (S pole) of the first magnet 21 and the south pole (S pole) of the second magnet 22 are partially staggered, or the north pole (N pole) of the first magnet 21 and the north pole (N pole) of the second magnet 22 are partially staggered. In this case, the first magnet 21 and the second magnet 22 can also form different magnetic fields around the first transmission member 10. In some other embodiments, the first magnet 21 and the second magnet 22 can be staggered. In this case, part of the first transmission member 10 will be subject to resistance from the corresponding magnetic field when entering or leaving the magnetic field formed by the first magnet 21 or entering or leaving the magnetic field formed by the second magnet 22.

[0111] The first magnet 21 can move relative to the second magnet 22. Among them, the first magnet 21 can have multiple moving directions relative to the second magnet 22. In some embodiments, the first magnet 21 can move in a direction approaching or departing from the second magnet 22. As the distance between the first magnet 21 and the second magnet 22 changes, the magnetic field intensity near the first transmission member 10 will also change accordingly, and the resistance exerted by the magnetic field on the first transmission member 10 will also be different. In other embodiments, the first magnet 21 can also move relative to the second magnet 22 in other directions to change the projected area of the first magnet 21 on the second magnet 22, that is, to change the area of the overlapping part between the first magnet 21 and the second magnet 22. This setting can also change the magnetic field intensity, thereby changing the resistance exerted by the magnetic field on the first transmission member 10.

[0112] This embodiment provides specific structures of some damping components 20, so that the damping components 20 can provide a magnetic field around the first transmission member 10, and enable the first transmission member 10 to form an induced current during movement, so that the damping components 20 can more stably provide resistance to the first transmission member 10; enable the first magnet 21 to move relative to the second magnet 22, so that the damping components 20 can provide magnetic fields with different magnetic field intensities, thereby being able to provide different resistances to the first transmission 10 member, and enabling the pressure roller 40 to have different speeds to adapt to different skew and different folding conditions of the pole piece 50.

[0113] Reference Figure 3 , in some embodiments, the first magnet 21 can rotate relative to the second magnet 22, and the first magnet 21 has different magnetic poles in the circumferential direction of its rotation axis to change the projected areas of different magnetic poles of the first magnet 21 on different magnetic poles of the second magnet 22.

[0114] The first magnet 21 can rotate relative to the second magnet 22. Specifically, the first magnet 21 can be fixed and the second magnet 22 can be rotated, or the second magnet 22 can be fixed and the first magnet 21 can be rotated, or both the first magnet 21 and the second magnet 22 can be rotated.

[0115] The first magnet 21 has different magnetic poles in the circumferential direction of the rotation axis of the first magnet 21. During the rotation of the first magnet 21, the projected area of the different magnetic poles of the first magnet 21 on the different magnetic poles of the second magnet 22 will change, that is, the relative positions of the different magnetic poles of the first magnet 21 and the different magnetic poles of the second magnet 22 will change, and thereby change the magnetic field strength at various positions in the magnetic field formed between the first magnet 21 and the second magnet 22. For example, the rotation of the first magnet 21 can change the relative position of the N pole of the first magnet 21 and the S pole of the second magnet 22, and reduce the overlapping area between the N pole of the first magnet 21 and the S pole of the second magnet 22. At this time, the magnetic field strength of the magnetic field generated at the corresponding position will decrease, and the resistance to the first transmission member 10 will also decrease. Another example is that the rotation of the first magnet 21 can change the relative position of the S pole of the first magnet 21 and the N pole of the second magnet 22, and increase the overlapping area between the S pole of the first magnet 21 and the N pole of the second magnet 22. At this time, the magnetic field strength of the magnetic field generated at the corresponding position will increase, and the resistance to the first transmission member 10 will also increase.

[0116] In this embodiment, the first magnet 21 is enabled to rotate relative to the second magnet 22 to change the projected area of the magnetic poles of the first magnet 21 on the different magnetic poles of the second magnet 22, thereby changing the intensity of the magnetic field formed between the first magnet 21 and the second magnet 22, and thereby changing the resistance provided by the magnetic field to the first transmission member 10, achieving the effect of providing different resistances to the first transmission member 10 through the damping assembly 20.

[0117] Reference Figure 3 , in some embodiments, the first magnet 21 includes a first part 211 and a second part 212 with different magnetic properties, the second magnet 22 includes a third part 221 and a fourth part 222 with different magnetic properties, and the magnetic properties of the third part 221 and the first part 211 are different; along the circumferential direction of the rotation axis of the first magnet 21, the first part 211 and the second part 212 are arranged in sequence, and the third part 221 and the fourth part 222 are arranged in sequence.

[0118] The first magnet 21 includes a first part 211 and a second part 212 with different magnetic properties. Both the first part 211 and the second part 212 are partial structures on the side of the first magnet 21 facing the second magnet 22; wherein, the first part 211 can be an N pole, then the second part 212 is an S pole; the first part 211 can also be an S pole, then the second part 212 is an N pole; the shapes of the first part 211 and the second part 212 can be arc-shaped, square or other shapes.

[0119] Since the first magnet 21 can rotate relative to the second magnet 22, the first magnet 21 has a rotating shaft so that the first magnet 21 can rotate around the rotating shaft; the first part 211 and the second part 212 are arranged in sequence in the circumferential direction around the rotating shaft. Specifically, the first part 211 and the second part 212 can be arranged at intervals or can be in contact with each other; when the first part 211 and the second part 212 are arranged at intervals, the first part 211 and the second part 212 can be connected by a structural member.

[0120] Similar to the first magnet 21, the second magnet 22 includes a third part 221 and a fourth part 222 with different magnetisms. Both the third part 221 and the fourth part 222 are partial structures on the side of the second magnet 22 facing the first magnet 21; among them, the third part 221 can be an N pole, then the first part 211 and the fourth part are both S poles; the third part 221 can also be an S pole, then the first part 211 and the fourth part 222 are N poles; the shapes of the third part 221 and the fourth part 222 can be arc-shaped, square or other shapes; the third part 221 and the fourth part 222 can be arranged at intervals in the circumferential direction around the rotating shaft of the first magnet 21 or can be in contact with each other. When the third part 221 and the fourth part 222 are arranged at intervals, the third part 221 and the fourth part 222 can be connected by a structural member.

[0121] When the first part 211 and the third part 221 are opposite to each other, a magnetic field in which magnetic induction lines pass through the first transmission member 10 can be generated between the first part 211 and the third part 221. The larger the projected area of the first part 211 on the third part 221, the greater the magnetic field strength of the magnetic field, and the greater the resistance received by the first transmission member 10 when passing through the magnetic field; the smaller the projected area of the first part 211 on the third part 221, the smaller the magnetic field strength of the magnetic field, and the smaller the resistance received by the first transmission member 10 when passing through the magnetic field.

[0122] Similar to the first part 211 and the third part 221, when the second part 212 and the fourth part 222 are opposite to each other, a magnetic field in which magnetic induction lines pass through the first transmission member 10 can be generated between the second part 212 and the fourth part 222. The larger the projected area of the second part 212 on the fourth part 222, the greater the magnetic field strength of the magnetic field, and the greater the resistance received by the first transmission member 10 when passing through the magnetic field; the smaller the projected area of the second part 212 on the fourth part 222, the smaller the magnetic field strength of the magnetic field, and the smaller the resistance received by the first transmission member 10 when passing through the magnetic field.

[0123] When the first magnet 21 rotates relative to the second magnet 22, the projected area of the first part 211 on the third part 221 will change, and the projected area of the second part 212 on the fourth part 222 will also change, and accordingly, the magnetic field strength of the corresponding magnetic field is adjusted, so as to achieve the effect of adjusting the resistance received by the first transmission member 10.

[0124] This embodiment provides some specific structures of the first magnet 21 and the second magnet 22, such that the first magnet 21 includes a first part 211 and a second part 212 arranged in sequence along its circumferential direction, and the second magnet 22 includes a third part 221 and a fourth part 222 arranged in sequence along the circumferential direction of the first magnet 21, so that the rotation of the first magnet 21 relative to the second magnet 22 can change the projected area of the first part 211 on the third part 221, thereby changing the intensity of the magnetic field formed between the first magnet 21 and the second magnet 22, and thereby changing the resistance provided by the magnetic field to the first transmission member 10, achieving the effect of providing different resistances to the first transmission member 10 through the damping assembly 20.

[0125] In some embodiments, both the first magnet 21 and the second magnet 22 are annular magnets. The first part 211 and the second part 212 are respectively half of the first magnet 21, and the first part 211 is the N pole of the first magnet 21, and the second part 212 is the S pole of the first magnet 21; the third part 221 and the fourth part 222 are respectively half of the second magnet 22, and the third part 221 is the S pole of the second magnet 22, and the fourth part 222 is the N pole of the second magnet 22.

[0126] According to some embodiments of the present application, refer to Figure 2 、 Figure 3 wherein, Figure 2 is a top view schematic diagram of the pressure roller 40 and the damping device 100 beside it provided by some embodiments of the present application, Figure 3 is a cross-sectional view schematic diagram of the damping device 100 provided by some embodiments of the present application.

[0127] In some embodiments of the present application, the damping device 100 further includes a second transmission member 30 drivingly connected to the first transmission member 10, and the second transmission member 30 is drivingly connected to the pressure roller 40.

[0128] The second transmission member 30 refers to the structure in the damping device 100 that is connected to the first transmission member 10 and drivingly connected to the pressure roller 40. At this time, the first transmission member 10 is indirectly drivingly connected to the pressure roller 40 through the second transmission member 30; the material of the second transmission member 30 can be plastic, metal or other materials.

[0129] The second transmission member 30 can be directly connected to the pressure roller 40; for example, the second transmission member 30 can be directly in contact with the pressure roller 40, so that the rotation of the pressure roller 40 can drive the second transmission member 30 to rotate accordingly through friction. At this time, the second transmission member 30 can be a friction wheel or other wheel-shaped structures; for another example, the second transmission member 30 can also be a gear. At this time, a corresponding gear can be provided on the pressure roller 40, so that the pressure roller 40 can drive the second transmission member 30 to rotate.

[0130] Since the first transmission member 10 is indirectly connected to the pressure roller 40 through the second transmission member 30, the shape of the first transmission member 10 can be circular, annular, square, triangular or other shapes; the first transmission member 10 can be directly connected to the second transmission member 30 through a rotating shaft, or can be connected to the second transmission member 30 through a coupling or other components, and the first transmission member 10 can also be connected to the second transmission member 30 through a gear set, a link structure or other structures.

[0131] Since the first transmission member 10 needs to be subject to the resistance of the damping assembly 20, if the first transmission member 10 is directly connected to the pressure roller 40, due to the influence of the first transmission member 10 and the pressure roller 40, the installation space of the damping assembly 20 will be small, and it is not easy to set up the damping assembly 20; indirectly connecting the first transmission member 10 and the pressure roller 40 through the second transmission member 30 can provide a larger installation space for the damping assembly 20 and reduce the installation and design difficulties.

[0132] In this embodiment, the first transmission member 10 is drivingly connected to the pressure roller 40 through the second transmission member 30, so as to facilitate the layout of the structure and relieve problems such as the narrow installation space caused by directly connecting the first transmission member 10 and the pressure roller 40.

[0133] Reference Figure 3 , in some embodiments, the second transmission member 30 is in contact with the pressure roller 40 and can rotate with the pressure roller 40 by friction.

[0134] The pressure roller 40 can drive the second transmission member 30 to rotate by friction, so structures such as friction lines can be provided on the surface of the second transmission member 30 in contact with the pressure roller 40 to increase the friction between the second transmission member 30 and the pressure roller 40 and reduce the occurrence of idling and slipping.

[0135] The pressure roller 40 drives the second transmission member 30 to rotate by friction, and the rolling friction is provided between the pressure roller 40 and the second transmission member 30. This setting can play a role in protecting the pressure roller 40 and the pole piece 50. For example, when the rotational speed of the second transmission member 30 suddenly changes, the second transmission member 30 can slide relative to the pressure roller 40 to reduce the situation where the rotational speed of the pressure roller 40 suddenly changes due to the influence of the second transmission member 30, thereby reducing the occurrence of sudden changes in the load of the pressure roller 40, and can also reduce the occurrence of sudden changes in the resistance received by the pole piece 50, so as to improve the service life and stability of the pressure roller 40, and can also reduce the possible negative impact of the damping device 100 on the pole piece 50.

[0136] In this embodiment, the second transmission member 30 is in contact with the pressure roller 40 so that the pressure roller 40 drives the second transmission member 30 to rotate by friction. Compared with methods such as gear transmission, using friction transmission can provide buffering for the damping device 100 and the pressure roller 40 to reduce the negative impact that may be caused by the sudden increase in load due to the sudden change in the resistance received by the first transmission member 10.

[0137] refer to Figure 3 In some embodiments, the second transmission member 30 includes a base 31 and a damping member 32 arranged around the base 31, the base 31 is connected to the first transmission member 10, and the damping member 32 is in contact with the pressure roller 40 and can rotate with the pressure roller 40 through friction.

[0138] The base 31 refers to a structure in the second transmission member 30 that provides a fixed foundation for other structures. The base 31 can be connected to the first transmission member 10 so that the rotation of the second transmission member 30 can drive the first transmission member 10 to rotate; the material of the base 31 can be plastic, metal or other materials.

[0139] The damping component 32 is arranged around the base 31. The damping structure can be an annular component and is mounted outside the base 31. The damping structure can also include a plurality of arc-shaped or strip-shaped components and are arranged at intervals along the circumference of the second transmission member 30. The material of the damping component 32 can be asbestos friction material, semi-metallic friction material or other materials with a higher friction coefficient.

[0140] The damping member 32 may be fixedly connected to the base 31 , for example, by gluing, bolting, etc.; the damping member 32 may also be detachably connected to the base 31 , for example, by snap-fitting, interference fitting, etc.

[0141] This embodiment provides some specific structures of the second transmission member 30, so that the second transmission member 30 is connected to the first transmission member 10 through the base 31, and is connected to the pressure roller 40 through the damping component 32; because the damping component 32 is connected to the pressure roller 40 through friction, this setting is likely to lead to a shorter life of the damping component 32, so the second transmission member 30 includes the base 31 and the damping component 32 so that the damping component 32 can be replaced separately, so as to improve the overall life of the damping device 100.

[0142] In some embodiments, the material of the damping member 32 includes at least one of a rubber-based material, a carbon fiber material, a resin-based material, or a semi-metal material.

[0143] The rubber-based material is a polymer composite material with excellent elasticity and reversible deformation ability; the rubber-based material can specifically be butyl rubber (IIR), chlorosulfonated polyethylene rubber (CSM) or other rubber-based materials; because the rubber-based material has elasticity, the material of the damping component 32 includes rubber, which can make the damping component 32 abut against the pressure roller 40 and deform, so that the damping frame can increase the friction between the pressure roller 40 and the pressure roller 40 through the restoring force of the rubber, thereby reducing the occurrence of the second transmission member 30 slipping relative to the pressure roller 40.

[0144] Carbon fiber material is a high molecular fiber raw material containing carbon element, with characteristics such as high strength, high rigidity, wear resistance, high temperature resistance, and fatigue resistance; the carbon fiber material can increase the friction coefficient of the damping member 32 and can increase the service life of the damping member 32.

[0145] Resin-based material is a composite material with resin as the matrix, having characteristics such as high strength, high rigidity, wear resistance, high temperature resistance, and fatigue resistance; the resin-based material can increase the friction coefficient of the damping member 32 and can increase the service life of the damping member 32.

[0146] Semi-metallic material refers to a material with both metallic and non-metallic characteristics. For example, it can include ferrous metals (such as steel fibers, reduced iron powder, iron powder foam, etc.). The semi-metallic material has characteristics such as high strength, good heat resistance, high power absorption per unit area, and large thermal conductivity, and can increase the service life of the damping member 32.

[0147] The technical solution of this embodiment provides some specific materials for the damping member 32, so that a relatively large frictional force can be generated between the damping member 32 and the pressure roller 40, so that the damping member 32 can better rotate synchronously with the pressure roller 40 and can reduce the sliding friction between the damping member 32 and the pressure roller 40.

[0148] Reference Figure 2 、 Figure 3 , in some embodiments, in the axial direction of the pressure roller 40, the size range of the contact surface between the second transmission member 30 and the pressure roller 40 is 3 millimeters (mm) to 20 mm. Specifically, this size can be 3 mm, 5 mm, 7 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm or other values.

[0149] The contact surface between the second transmission member 30 and the pressure roller 40 refers to the surface on the side of the second transmission member 30 facing the pressure roller 40 and capable of contacting the pressure roller 40. The size of this surface in the axial direction of the pressure roller 40 is the Figure 2 size shown as H in Figure 3 . The size of the contact surface between the second transmission member 30 and the pressure roller 40 in the axial direction of the pressure roller 40 is positively correlated with the contact area between the second transmission member 30 and the pressure roller 40; according to the structure of the second transmission member 30, the size of the contact surface between the second transmission member 30 and the pressure roller 40 in the axial direction of the pressure roller 40 can refer to the size of the damping member 32 in the axial direction of the pressure roller 40, that is, the width of the damping member 32, which is also the

[0150] The dimension range of the contact surface between the second transmission member 30 and the pressure roller 40 along the axial direction of the pressure roller 40 being 3 mm to 20 mm can enable a large contact area between the second transmission member 30 and the pressure roller 40, so as to reduce the concentration of the pressure of the second transmission member 30 on the pressure roller 40, thereby reducing the possible negative impact of the second transmission member 30 on the pressure roller 40. At the same time, it can also enable the second transmission member 30 to be more stably in contact with the pressure roller 40; meanwhile, this dimension range can also reduce the overall width of the second transmission member 30, thereby reducing the space occupied by the second transmission member 30 and reducing the overall volume and weight of the damping device 100.

[0151] This embodiment provides a width range of the second transmission member 30, so that the second transmission member 30 can better provide resistance to the pressure roller 40, and at the same time, it can also reduce the space requirement of the second transmission member 30, thereby reducing the overall volume and weight of the damping device 100.

[0152] According to some embodiments of the present application, referring to Figure 3 , Figure 3 is a schematic cross-sectional view of the damping device 100 provided by some embodiments of the present application.

[0153] In some embodiments of the present application, the damping device 100 further includes a housing 23. The second transmission member 30 is disposed outside the housing 23, and the first transmission member 10 and the damping structure are accommodated in the housing 23.

[0154] The housing 23 refers to the structure in the damping device 100 that provides a fixed foundation for other structures. The housing 23 is used to provide a fixed foundation for the first transmission member 10, the second transmission member 30, the damping assembly 20 and other structures; the housing 23 can be in the shape of a cuboid, a cylinder or other shapes; the material of the housing 23 can include plastics, metals or other materials.

[0155] An accommodation space is provided in the housing 23. The first transmission member 10 and the damping structure are accommodated in the accommodation space inside the housing 23 to protect the first transmission member 10 and the damping structure; the second transmission member 30 is disposed outside the housing 23 to facilitate the connection between the second transmission member 30 and the pressure roller 40; the first transmission member 10 can be connected to the second transmission member 30 through a rotating shaft, a coupling or other structures. At this time, one end of the rotating shaft, the coupling or other structures is inside the accommodation space and the other end extends outside the accommodation space.

[0156] This embodiment makes the damping device 100 further include a housing 23, and the housing 23 accommodates the first transmission member 10 and the damping structure to play a role in protecting the first transmission member 10 and the damping structure; at the same time, the second transmission member 30 is outside the housing 23 to facilitate the transmission connection of the second transmission member 30 to the pressure roller 40.

[0157] According to some embodiments of the present application, referring to Figure 1 ,Figure 1 A top view schematic diagram of the pole piece flattening device 200 provided for some embodiments of the present application.

[0158] In some embodiments of the present application, the pole piece flattening device 200 includes at least one pressing roller 40, and at least one damping device 100 can be arranged on the circumferential side of any pressing roller 40.

[0159] The number of the pressing rollers 40 can be one, two or more. The pressing rollers 40 can be arranged on either side of the pole piece 50 as required; the damping device 100 can be arranged on one side of any pressing roller 40 as required, or the damping device 100 can be arranged on the side of multiple pressing rollers 40; according to the required resistance of the pressing roller 40, one damping device 100 can be arranged beside the pressing roller 40, or two or more damping devices 100 can be arranged.

[0160] In this embodiment, the damping device 100 can be arranged beside any pressing roller 40 as required, or can be respectively arranged beside several pressing rollers 40; at the same time, only one damping device 100 can be arranged beside each pressing roller 40, or multiple damping devices 100 can be arranged to meet the different requirements of different working conditions.

[0161] According to some embodiments of the present application, refer to Figure 4 , Figure 4 A three-dimensional schematic diagram of the bracket in the damping device 100 provided for some embodiments of the present application.

[0162] In some embodiments of the present application, the damping device 100 further includes a bracket 24, and the bracket 24 is detachably arranged beside any pressing roller 40.

[0163] The bracket 24 refers to the structure in the damping device 100 that provides a fixed base for the damping component 20; the bracket 24 can include a columnar structure, a frame structure or other structures; the material of the bracket 24 can be plastic, metal or other materials.

[0164] The bracket 24 is detachably arranged beside any pressing roller 40, so that the staff can install the damping device 100 beside the pressing roller 40 as required. The detachable connection method of the bracket 24 can be realized by bolt connection, snap connection or other connection methods; the bracket 24 can be installed on the frame of the pole piece flattening device 200, or can be installed on the frame of the pressing roller 40 or other structural members.

[0165] In this embodiment, the damping device 100 can be detachably arranged beside any pressing roller 40 through the bracket 24, so that the staff can change the position of the damping device 100 according to the actual working conditions, which improves the flexibility of the use of the damping device 100 and also reduces the cost.

[0166] In some embodiments, the pole piece flattening device 200 is arranged after the cold pressing process of the pole piece 50. The pressing roller 40 is arranged at the outlet of the cold pressing process. There are two damping devices 100, which are respectively arranged on both sides of the pressing roller 40 to apply resistance to the pressing roller 40. The damping structure in the second transmission member 30 of the damping device 100 is mainly composed of carbon fiber material. The size of the damping structure in the axial direction of the pressing roller 40 is 8 mm. The cross-sectional shape of the damping structure along the radial direction of the second transmission member 30 is a rounded rectangle. The first magnet 21 in the damping device 100 has at least nine different rotational positions, so that the damping device 100 can provide at least nine different resistances to the pressing roller 40.

[0167] The base material of the pole piece 50 passing through the pole piece flattening device 200 is a copper foil with a thickness of 6 micrometers (μm).

[0168] In a second aspect, some embodiments of the present application further provide a pole piece coating device, which is used to coat active substances on the current collector of the pole piece 50. The pole piece coating device may include a pressing roller 40, which is used to flatten the active substances coated on the pole piece 50 and flatten the blank area 51. The pressing roller 40 is a passive roller and rotates synchronously with the advancement of the pole piece 50. The pressing roller 40 is used to enable the active substances to be evenly and flatly distributed, and is also used to reduce the wrinkles in the blank area 51.

[0169] In some embodiments of the present application, the pole piece coating device includes the damping device 100 and the pressing roller 40 provided in some embodiments of the first aspect. The pressing roller 40 can press on the pole piece 50 and can rotate with the displacement of the pole piece 50. The damping device 100 includes a first transmission member 10 and a damping assembly 20. The first transmission member 10 can rotate with the pressing roller 40. The damping assembly 20 is arranged beside the first transmission member 10, and the damping assembly 20 can apply resistance to the first transmission member 10.

[0170] Similar to the pole piece flattening device 200 provided in some embodiments of the first aspect, the pressing roller 40 can rotate with the displacement of the pole piece 50. The damping device 100 is arranged on one side of the pressing roller 40. The rotation of the pressing roller 40 can drive the first transmission member 10 of the damping device 100 to rotate. The damping device 100 can apply resistance to the first transmission member 10 to reduce the rotation speed of the first transmission member 10, thereby reducing the rotation speed of the pressing roller 40. The reduction of the rotation speed of the pressing roller 40 causes the pressing roller 40 to generate a relative movement in the opposite direction to the pole piece 50 and form a force in the opposite direction to the movement direction of the pole piece 50 to reduce the advancement speed of the pole piece 50.

[0171] When the pressing roller 40 is displaced, skewed, or the pole piece 50 is skewed or wrinkled, the damping device 100 is activated to cause the pressing roller 40 to move and exert a force in the opposite direction to the pole piece 50. This movement has a component movement perpendicular to the pole piece 50 to stretch the pole piece 50 and flatten the wrinkles. Another component movement of this movement can drive the pole piece 50 to move to relieve the displacement and skew of the pole piece 50. This force has a component force perpendicular to the pole piece 50 that can stretch the pole piece 50 to relieve the wrinkles of the pole piece 50 and flatten the wrinkles of the pole piece 50. Another component force of this force can drive the pole piece 50 to move to relieve the displacement problem of the pole piece 50 and correct the position of the pole piece 50.

[0172] In some embodiments, the pole piece coating device includes at least one pressing roller 40, and at least one damping device 100 can be arranged on the circumferential side of any pressing roller 40.

[0173] Similar to the pole piece flattening device 200 provided in some embodiments of the first aspect, the number of pressing rollers 40 can be one, two or more. The pressing rollers 40 can be arranged on either side of the pole piece 50 as needed. The damping device 100 can be arranged on one side of any pressing roller 40 as needed, or damping devices 100 can be arranged on the sides of multiple pressing rollers 40. According to the required resistance of the pressing roller 40, one damping device 100 can be arranged beside the pressing roller 40, or two or more damping devices 100 can be arranged.

[0174] This embodiment enables the damping device 100 to be arranged beside any pressing roller 40 as needed, or can be respectively arranged beside several pressing rollers 40. At the same time, only one damping device 100 can be arranged beside each pressing roller 40, or multiple damping devices 100 can be arranged to meet the different requirements of different working conditions.

[0175] In some embodiments, the damping device 100 further includes a bracket 24, and the bracket 24 is detachably arranged beside any pressing roller 40.

[0176] Similar to the pole piece flattening device 200 provided in some embodiments of the first aspect, the bracket 24 is detachably arranged beside any pressing roller 40, so that the staff can install the damping device 100 beside the pressing roller 40 as needed. The detachable connection method of the bracket 24 can be realized by bolt connection, snap connection or other connection methods. The bracket 24 can be installed on the frame of the pole piece coating device, or on the frame of the pressing roller 40 or other structural members.

[0177] In this embodiment, the damping device 100 can be detachably arranged beside any pressing roller 40 through the bracket 24, so that the staff can change the position of the damping device 100 according to the actual working conditions, improving the flexibility of the use of the damping device 100 and also reducing the cost.

[0178] In some embodiments, a pressure roller 40 is provided beside the outlet of the oven of the pole piece coating device. There is a damping device 100 which is arranged beside the pressure roller 40 and can apply resistance to the pressure roller 40. The damping structure in the second transmission member 30 of the damping device 100 is mainly composed of a resin-based material. The dimension of the damping structure in the axial direction of the pressure roller 40 is 5 mm. The cross-sectional shape of the damping structure along the radial direction of the second transmission member 30 is a right-angled rectangle. The first magnet 21 in the damping device 100 has at least nine different rotational positions, so that the damping device 100 can provide at least nine different resistances to the pressure roller 40.

[0179] The base material of the pole piece 50 coated on the pole piece coating device is a copper foil with a thickness of 5 micrometers (um).

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece flattening device, It is characterized in that include: A pressure roller, capable of pressing and holding the pole piece, and the pressure roller can rotate with the displacement of the pole piece; A damping device, comprising a first transmission member and a damping assembly; The first transmission member can rotate with the pressure roller; the damping component is arranged beside the first transmission member, and the damping component can apply resistance to the first transmission member.

2. The pole piece flattening device according to claim 1, It is characterized in that The damping assembly includes at least two different states to apply resistances of different magnitudes to the first transmission member.

3. The pole piece flattening device according to claim 1 or 2, It is characterized in that The material of the first transmission member includes a magnetic conductive material, and the damping component can form a magnetic field around the first transmission member; The rotation of the first transmission member in the magnetic field can form a closed current inside the first transmission member.

4. The pole piece flattening device according to claim 3, It is characterized in that The first transmission element comprises an annular component, so that the first transmission element rotates in the magnetic field to form an annular closed current inside the first transmission element.

5. The pole piece flattening device according to claim 3, It is characterized in that The damping assembly includes a first magnet and a second magnet disposed on opposite sides of the first transmission member, and the first magnet is movable relative to the second magnet.

6. The pole piece flattening device according to claim 5, It is characterized in that The first magnet is rotatable relative to the second magnet, and the first magnet has different magnetic poles in the circumferential direction of its rotation axis to change the projection areas of different magnetic poles of the first magnet on different magnetic poles of the second magnet.

7. The pole piece flattening device according to claim 6, It is characterized in that The first magnet includes a first portion and a second portion having different magnetic properties, the second magnet includes a third portion and a fourth portion having different magnetic properties, and the third portion and the first portion have different magnetic properties; Along the circumferential direction of the rotation axis of the first magnet, the first portion and the second portion are arranged in sequence, and the third portion and the fourth portion are arranged in sequence.

8. The pole piece flattening device according to claim 1, It is characterized in that The damping device further comprises a second transmission member drivingly connected to the first transmission member, and the second transmission member drivingly connected to the pressure roller.

9. The pole piece flattening device according to claim 8, It is characterized in that The second transmission member is in contact with the pressure roller and can rotate along with the pressure roller through friction.

10. The pole piece flattening device according to claim 9, It is characterized in that The second transmission member includes a base and a damping member arranged around the base, the base is connected to the first transmission member, and the damping member is in contact with the pressure roller and can rotate with the pressure roller through friction.

11. The pole piece flattening device according to claim 9 or 10, It is characterized in that The material of the damping member includes at least one of a rubber-based material, a carbon fiber material, a resin-based material or a semi-metallic material.

12. The pole piece flattening device according to claim 9 or 10, It is characterized in that In the axial direction of the pressure roller, the size range of the contact surface between the second transmission member and the pressure roller is 3 mm to 20 mm.

13. The pole piece flattening device according to claim 9 or 10, It is characterized in that The damping device further comprises a housing, the second transmission member is arranged outside the housing, and the first transmission member and the damping structure are accommodated in the housing.

14. The pole piece flattening device according to claim 1, It is characterized in that The pole piece flattening device comprises at least one of the pressure rollers, and at least one of the damping devices can be arranged on the circumference of any of the pressure rollers.

15. The pole piece flattening device according to claim 1, It is characterized in that The damping device further comprises a bracket, and the bracket is detachably arranged beside any one of the pressing rollers.

16. A pole piece coating device, It is characterized in that include: A pressing roller, capable of pressing and holding the pole piece, and the pressing roller can rotate with the displacement of the pole piece; A first transmission member capable of rotating with the pressure roller; The damping component is arranged beside the first transmission member, and the damping component can apply resistance to the first transmission member.

Images