Flattening device and battery manufacturing equipment

Abstract

The utility model discloses a flattening device and battery manufacturing equipment. The smoothing device comprises a supporting piece and at least two roller assemblies, the at least two roller assemblies are arranged at intervals, each roller assembly comprises a connecting part and a smoothing roller, each connecting part comprises an elastic piece, one end of each elastic piece is connected with the corresponding supporting piece, each smoothing roller is rotatably arranged at the other end of the corresponding elastic piece, and each smoothing roller is configured to make contact with a winding piece on a reel. The winding part is smoothed through rolling friction; the contact portions of the smoothing rollers of the at least two roller assemblies and the winding piece are arranged at intervals in the winding direction of the winding shaft. In this way, rolling friction contact can be formed between the smoothing roller and the winding piece, and therefore the risk that the winding piece is damaged and a coating falls off can be effectively reduced. And meanwhile, due to the rotating design of the smoothing roller, the fallen coating can be discharged in time, local accumulation of the fallen coating on the smoothing roller is reduced, and the probability of scratching the winding piece is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, and particularly relates to a flattening device and a battery manufacturing equipment. BACKGROUND

[0002] With the development of new energy technology, the application of batteries is more and more extensive, such as being applied to mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircrafts, electric ships, electric toy cars, electric toy ships, electric tools and the like. The core of the performance of the battery lies in the manufacturing quality of the battery monomer.

[0003] In the manufacturing process of the battery monomer, winding the anode pole piece, the cathode pole piece and the diaphragm coated with active material into a bare battery is a relatively key process. The fitting quality of the pole piece in the winding end stage, especially the flatness and integrity of the interface between the diaphragm and the pole piece, has a great influence on the final capacity, internal resistance, cycle life and the like of the battery monomer.

[0004] In the related art, a flattening plate is usually used to press and flatten the end of the pole piece and the diaphragm in the winding end stage to ensure firm attachment. However, the flattening plate is prone to hard friction with the fragile diaphragm, increasing the risk of scratching the diaphragm and the pole piece. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the present application is to provide a flattening device and a battery manufacturing equipment, which aims to solve the technical problem that in the related art, the flattening plate is prone to hard friction with the fragile diaphragm, increasing the risk of scratching the diaphragm and the pole piece and the like.

[0006] To solve the above problems, the application provides a smoothing device, which comprises a support and at least two roller assemblies, wherein the at least two roller assemblies are arranged at intervals, each roller assembly comprises a connecting part and a smoothing roller, the connecting part comprises an elastic member, one end of the elastic member is connected with the support, the other end of the elastic member is rotatably provided with the smoothing roller, the smoothing roller is configured to be in contact with a winding member on the winding shaft to smooth the winding member through rolling friction, and the contact parts of the smoothing rollers of the at least two roller assemblies are arranged at intervals along the winding direction of the winding shaft. Thus, the above scheme can realize the smoothing of the winding member at the end of winding through the distributed contact parts formed by the multiple roller assemblies arranged at intervals, and the winding quality of the winding member is improved. The elastic member can be elastically deformed when the smoothing roller contacts the winding member, the elastic member can automatically adjust the position of the smoothing roller through stretching and contraction, and the constancy of the contact pressure is improved. Meanwhile, the buffering effect of the elastic member can reduce the vibration of the smoothing roller during movement, and the stability of the smoothing process is improved. The smoothing roller is in rolling friction contact with the winding member, so that the contact stress can be effectively reduced, and the risk of damage and coating peeling of the winding member is reduced. Meanwhile, the rotating design of the smoothing roller can timely remove the peeled coating, reduce the accumulation of the coating in the local part of the smoothing roller, and further reduce the probability of scratching the winding member. When the winding member comprises a diaphragm and a pole piece, the smoothing device can reduce the risk of scratching the diaphragm and the pole piece.

[0007] In some embodiments, the connecting part further comprises a guide rail, the extension direction of the guide rail is the same as the stretching direction of the elastic member, one end of the guide rail is slidably connected with the support, and the other end of the guide rail is rotatably provided with the smoothing roller. Thus, the guide rail and the elastic member can cooperate to support the smoothing roller, reduce the shaking or tilting of the smoothing roller, improve the structural stability of the roller assembly, and the guide rail can guide the movement direction of the smoothing roller to reduce the deviation of the smoothing roller during movement.

[0008] In some embodiments, the connecting part further comprises a guide rail and a sliding block in sliding connection, one end of the guide rail is connected with the support, the extension direction of the guide rail is the same as the stretching direction of the elastic member, and the smoothing roller is rotatably connected with the sliding block. Thus, through the sliding cooperation of the guide rail and the sliding block, the smoothing roller can maintain a predetermined direction during movement, and the uneven contact pressure caused by deviation is reduced.

[0009] In some embodiments, the smoothing device further comprises a driving member, the driving member is connected with the support, and the driving member is configured to drive the movement of the at least two roller assemblies to make the smoothing roller close to or away from the winding shaft. Thus, the displacement of the roller assembly can be controlled through the driving member, and the dynamic fitting of the smoothing roller and the winding member can be realized. Moreover, the driving member drives the roller assembly as a whole to move away from the winding member, and zero-contact avoidance can be realized during the start and stop of winding and during the winding change, so as to reduce the risk of mechanical collision between the smoothing device and the winding member.

[0010] In some embodiments, the width of the smoothing roller along the first direction is not less than the width of the winding along the first direction, wherein the first direction is the axial direction of the smoothing roller. In this way, by setting the axial width of the smoothing roller to be not less than the width of the winding, the winding can be completely fitted with the winding shaft in the width direction, reducing the sliding deviation caused by insufficient local contact.

[0011] In some embodiments, the diameter of the smoothing roller is d1, and the diameter of the winding shaft is d2, wherein d1≤d2 / 4. In this way, the smaller diameter of the smoothing roller allows multiple smoothing rollers to be evenly distributed on the winding shaft surface. This size relationship allows the smoothing roller to have at least four evenly distributed contact points within the 120-degree contact area of the winding shaft, thus maintaining sufficient pressure and reducing the risk of scratches caused by excessive local pressure.

[0012] In some embodiments, the central axis of the winding shaft is horizontally arranged, and at least one of the contact portions of the smoothing rollers of the at least two roller assemblies with the winding is located obliquely above the central axis of the winding shaft, and at least one other is located obliquely below the central axis of the winding shaft. In this way, the obliquely upward smoothing roller of the winding shaft can apply downward pressure to the winding, allowing the winding to fit with the winding shaft when feeding. The obliquely downward smoothing roller can apply an upward lifting force to the winding, so that the tail of the winding does not fall off under the action of gravity, improving the winding quality of the winding.

[0013] In some embodiments, a smoothing plate is provided between at least one set of adjacent smoothing rollers. In this way, when the winding moves to the gap between the two adjacent smoothing rollers, the smoothing plate can smooth the winding. The combination of the smoothing roller and the smoothing plate increases the coverage of the smoothing device, which can reduce the shedding of the coating through rolling friction and enhance the smoothing effect through the action of the smoothing plate.

[0014] In some embodiments, the smoothing plate is curved. In this way, the curved contact surface can disperse the contact pressure between the winding and the smoothing plate, reducing the local scratching force on the winding and thus reducing the risk of scratching the winding.

[0015] In some embodiments, the smoothing roller includes a roller body and a flexible layer provided on the outer surface of the roller body, and the hardness of the flexible layer is less than the hardness of the roller body. In this way, the flexible properties of the flexible layer can effectively buffer the contact pressure, and the elastic deformation of the surface of the flexible layer can disperse the local stress and reduce the scratches caused by the hard surface.

[0016] In some embodiments, the flexible layer comprises a rubber layer. Thus, the rubber layer has better elastic buffering capacity, and its flexible nature can effectively absorb mechanical impact energy. When subjected to external pressure, the reversible deformation mechanism of the rubber molecular chain can convert concentrated stress into more uniform surface pressure, significantly reducing the peak stress of the contact interface. The rubber layer can balance support and flexibility, reducing the collapse of the flexible layer.

[0017] To solve the above problems, the application also provides a battery manufacturing equipment comprising the flattening device of any of the above embodiments.

[0018] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 is a structural schematic diagram of a vehicle provided by some embodiments of the application;

[0021] Figure 2 is an exploded structural schematic diagram of a battery device provided by some embodiments of the application;

[0022] Figure 3 is an exploded structural schematic diagram of a battery monomer provided by some embodiments of the application;

[0023] Figure 4 is a structural schematic diagram of a flattening device provided by some embodiments of the application;

[0024] Figure 5 is a structural schematic diagram of a flattening device provided by some other embodiments of the application;

[0025] Figure 6 is a structural schematic diagram of a flattening device provided by some other embodiments of the application;

[0026] Figure 7 is a structural schematic diagram of a flattening device provided by some other embodiments of the application;

[0027] Figure 8 is a structural schematic diagram of a flattening device provided by some other embodiments of the application;

[0028] Figure 9 is Figure 4 Structure diagram of an embodiment of a smoothing roller in a smoothing device.

[0029] Reference signs: 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, box; 51, first box part; 52, second box part; 6, battery cell; 40, housing; 10, electrode assembly; 20, casing; 30, end cover; 25, electrode terminal; 100, smoothing device; 11, support; 12, roller assembly; 121, connecting part; 122, smoothing roller; 14, reel; 13, winding member; 123, elastic member; 124, guide rail; 125, sliding block; 126, driving member; 127, smoothing plate; 1221, roller body; 1222, flexible layer. DETAILED DESCRIPTION

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0033] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to 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.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0035] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0039] As the basic component unit of the battery device, the manufacturing quality of the battery monomer has a great influence on the performance of the whole battery device. In the battery device composed of a plurality of battery monomers, the subtle quality defects of a single battery monomer will also be amplified through series and parallel connection, and then significantly affect the energy output efficiency and cycle service life of the whole battery device.

[0040] In the manufacturing process of the battery monomer, the electrode sheet winding process is a crucial core link. This process forms the basic internal structure of the battery monomer by precisely winding the anode electrode sheet, the cathode electrode sheet and the separator. The process quality of this process is directly related to the electrochemical performance of the battery monomer.

[0041] In the related art, a smoothing plate is usually used for smoothing treatment in the tail end stage of the jelly-roll winding process. However, this method has obvious defects: when the smoothing plate slides with the outer separator, it is easy to cause the functional coating on the surface of the separator to fall off. These fallen coating particles may gradually accumulate in the fixed position at the top of the smoothing plate, and may form a hard foreign matter accumulation after long-term use. In the subsequent winding tail end process, these accumulated foreign matters may scratch the surface of the separator and the jelly-roll, thereby significantly increasing the quality risk of the battery cell and affecting the performance of the final product.

[0042] Based on this, the present application provides a smoothing device, which comprises a support and at least two roller assemblies connected with the support, wherein the at least two roller assemblies are arranged at intervals, each roller assembly comprises a connecting part and a smoothing roller, the smoothing roller is configured to contact the winding piece on the winding shaft to smooth the winding piece through rolling friction; the contact parts of the smoothing rollers of the at least two roller assemblies are arranged at intervals along the winding direction of the winding shaft. By rolling contact with the winding piece through the at least two roller assemblies, rolling friction contact is formed, which can reduce damage to the winding piece and reduce the risk of coating falling off on the winding piece. At the same time, the rotating design of the smoothing roller can timely remove the fallen coating and reduce its local accumulation on the smoothing roller, thereby reducing the probability of foreign matter scratching the winding piece. Moreover, the interval distribution of the contact parts can make the stress on the winding piece more uniform, improve the fitting precision of the winding piece during the winding tail end, and improve the winding quality of the winding piece.

[0043] The battery device mentioned in the embodiments of the present application can include one or more battery cells, and the plurality of battery cells are connected in series, in parallel or in a hybrid manner through a busbar component. The hybrid connection means that there are both series connection and parallel connection among the plurality of battery cells.

[0044] The battery cell described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The disposable battery is also called "throwaway" battery and primary battery, because it cannot be charged for use after its power is consumed and can only be discarded. The rechargeable battery is also called secondary battery or secondary cell, storage battery. The manufacturing materials and process of the rechargeable battery are different from those of the primary battery, and its characteristic is that it can be used repeatedly after being charged. The output current load capacity of the rechargeable battery is higher than that of most disposable batteries.

[0045] The battery cell can include but is not limited to lithium ion battery cell, sodium ion battery cell, sodium lithium ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium sulfur battery cell, magnesium ion battery cell, nickel hydrogen battery cell, nickel cadmium battery cell, lead storage battery cell, etc.

[0046] Optionally, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0047] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0049] like Figure 1 As shown, Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0050] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 controls the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0051] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0052] like Figure 2 As shown, Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0053] The box 5 is used to accommodate the battery cell 6, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box part 51 and a second box part 52, the first box part 51 and the second box part 52 are mutually covered, and the first box part 51 and the second box part 52 jointly define an accommodation space for accommodating the battery cell 6. The first box part 51 can be a hollow structure with one end open, and the second box part 52 is a plate-shaped structure, which is covered on the open side of the first box part 51 to form the box 5 with the accommodation space; the first box part 51 and the second box part 52 can also be hollow structures with one side open, and the open side of the first box part 51 is covered on the open side of the second box part 52 to form the box 5 with the accommodation space. Of course, the first box part 51 and the second box part 52 can be of various shapes, such as a cylinder, a cuboid, etc.

[0054] In the battery device 2, the battery cell 6 can be one or multiple. If the battery cell 6 is multiple, the multiple battery cells 6 can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells 6 are connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 6 is accommodated in the box 5; of course, the multiple battery cells 6 can be first connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box 5.

[0055] The battery cell 6 can be the smallest unit constituting the battery device 2. As shown in Figure 3 Figure 3 is a schematic diagram of the exploded structure of the battery cell provided in some embodiments of the present application.

[0056] As shown in Figure 3 , the battery cell 6 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40.

[0057] The housing 40 is used to package the electrode assembly 10 and other components such as electrolyte. The housing 40 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc. The electrolyte plays a role of conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid.

[0058] ​In some embodiments, the housing 40 includes a shell 20 and an end cap 30, the shell 20 having an opening. The shell 20 is a component for fitting the end cap 30 to form an internal environment of the battery cell 6, wherein the formed internal environment can be used to contain the electrode assembly 10, the electrolyte and other components. The end cap 30 refers to a component that is capped on the opening of the shell 20 to insulate the internal environment of the battery cell 6 from the external environment. Without limitation, the shape of the end cap 30 can be adapted to the shape of the shell 20 to fit the shell 20. Optionally, the end cap 30 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cap 30 is less likely to deform when subjected to extrusion collision, allowing the battery cell 6 to have higher structural strength. The end cap 30 can be provided with functional components such as the electrode terminal 25. The electrode terminal 25 can be used to electrically connect with the electrode assembly 10 for outputting or inputting the electrical energy of the battery cell 6.

[0059] The electrode assembly 10 is a component in which electrochemical reactions occur in the battery cell 6. One or more electrode assemblies 10 can be contained in the shell 20. The electrode assembly 10 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials constituting the main body of the electrode assembly 10, and portions without active materials of the positive electrode sheet and the negative electrode sheet each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body respectively.

[0060] In some embodiments, the positive electrode sheet, the negative electrode sheet and the separator arranged in a stack can be wound to form a cylindrical body, and the cylindrical body can be rolled to form the electrode assembly 10 with the intermediate flat sides and the two bent sides.

[0061] In order to improve the performance of the battery cell 6, the embodiments of the present application also provide a battery manufacturing device, which includes a winding device and a smoothing device. The winding device includes a winding shaft for winding the electrode sheet and the separator, and the smoothing device is used to perform finishing smoothing on the electrode sheet and the separator at the end of the winding of the winding shaft.

[0062] In order to improve the winding quality of the electrode sheet, the embodiments of the present application provide a smoothing device, please refer to Figure 4 Figure 4 is a structural schematic diagram of the smoothing device provided by some embodiments of the present application.

[0063] ​The flattening device 100 comprises a support 11 and at least two roller assemblies 12, wherein the at least two roller assemblies 12 are arranged at intervals, each roller assembly 12 comprises a connecting part 121 and a flattening roller 122, one end of the connecting part 121 is connected with the support 11, and the flattening roller 122 is rotatably arranged at the other end of the connecting part 121, and the flattening roller 122 is configured to be in contact with the winding piece 13 on the winding shaft 14 to flatten the winding piece 13 through rolling friction; the contact parts of the flattening rollers 122 of the at least two roller assemblies 12 are arranged at intervals along the winding direction of the winding shaft 14.

[0064] The flattening device 100 comprises at least two roller assemblies 12 arranged at intervals, each roller assembly 12 comprises a connecting part 121 and a rotatable flattening roller 122. The winding shaft 14 is used for winding the winding piece 13. The flattening roller 122 can act on the winding piece 13 on the winding shaft 14 through rolling contact, and the contact parts of the plurality of roller assemblies 12 are arranged at intervals along the winding direction of the winding shaft 14. The connecting part 121 of the roller assembly 12 is used to fix the flattening roller 122 and transmit external force.

[0065] The roller assembly 12 can be arranged on one side of the winding shaft 14, and the number of roller assemblies 12 can be two, three or more. The number of roller assemblies 12 can be adjusted according to the diameter of the winding shaft 14. For example, the winding shaft 14 with a larger diameter can increase the number of roller assemblies 12 to ensure the contact area. Adjacent roller assemblies 12 are arranged at intervals, so that adjacent roller assemblies 12 do not interfere with each other.

[0066] When the winding of the winding shaft 14 is completed, the flattening device 100 can be used to flatten the tail of the winding piece 13. The distributed contact parts are formed by the plurality of roller assemblies 12 arranged at intervals, and the interval distribution of the contact parts makes the force on the winding piece 13 more uniform, reduces the slip amount of the winding piece 13 in the width direction, improves the fitting precision of the winding piece 13 during winding completion, and improves the winding quality of the winding piece 13. When the flattening device 100 performs the flattening operation, rolling friction contact is formed between the flattening roller 122 and the winding piece 13, so that the contact stress can be effectively reduced, the damage to the winding piece 13 is reduced, and the risk of coating falling off the winding piece 13 is reduced. At the same time, the rotation design of the flattening roller 122 can timely remove the coating falling off the winding piece 13, reduce the local accumulation of the coating on the flattening roller 122, and further reduce the probability of scratching the winding piece 13.

[0067] The winding piece 13 may, for example, include positive electrode plates, negative electrode plates and separators arranged in layers, and the winding shaft 14 is used to wind the positive electrode plates, separators, negative electrode plates and separators arranged in layers, so that they are tightly wound on the winding shaft 14. In the final stage of winding on the winding shaft 14, the winding piece 13 is cut by a cutter, and the flattening roller 122 of the flattening device 100 is in close contact with the feeding area of the winding shaft 14 to flatten the winding piece 13 and improve the winding quality of the winding piece 13.

[0068] As shown in Figure 5 , Figure 5 is a structural schematic diagram of a flattening device provided by some embodiments of the present application. Optionally, the connecting part 121 may include an elastic member 123, one end of the elastic member 123 is connected with the support 11, and the flattening roller 122 is rotatably arranged at the other end of the elastic member 123.

[0069] The elastic member 123 can provide an elastic force to adjust the contact pressure of the flattening roller 122 with the winding shaft 14. The flattening roller 122 is rotatably mounted at the end of the elastic member 123, and when the flattening roller 122 contacts the winding piece 13 on the winding shaft 14, the elastic member 123 can elastically deform with the change of pressure. The elastic member 123 may, for example, be a metal spring. In other embodiments, the elastic member 123 may, for example, also be an elastic rubber material. The end of the elastic member 123 may, for example, be provided with a fixed part and a rotating shaft, and the rotating shaft is connected with the flattening roller 122 to realize the rotational connection of the flattening roller 122 with the elastic member 123. The manner of the rotational connection of the elastic member 123 with the flattening roller 122 is within the scope of understanding of those skilled in the art, and will not be described in detail here.

[0070] By arranging the elastic member 123, the elastic member 123 elastically deforms when the flattening roller 122 contacts the winding piece 13, and the elastic member 123 can automatically adjust the position of the flattening roller 122 through stretching and contraction. The flattening roller 122 can automatically adjust the degree of adhesion according to the change of pressure when contacting the winding shaft 14, so that the winding piece 13 can stably contact the flattening roller 122 during the final process. At the same time, the buffering effect of the elastic member 123 can reduce the vibration of the flattening roller 122 during movement, and improve the stability of the flattening process.

[0071] As shown in Figure 6 , Figure 6 is a structural schematic diagram of a flattening device provided by some embodiments of the present application.

[0072] In some embodiments, the connecting part 121 further includes a guide rail 124, the extending direction of the guide rail 124 is the same as the stretching and contraction direction of the elastic member 123, one end of the guide rail 124 is slidingly connected with the support 11, and the flattening roller 122 is rotatably arranged at the other end of the guide rail 124.

[0073] The guide rail 124 can slide relative to the support member 11. To achieve this sliding connection, a through hole (not shown) can be provided on the support member 11, allowing one end of the guide rail 124 to pass through and slide within the through hole. Alternatively, in other embodiments, a guide block with a guide groove (not shown) can be provided on one side of the support member 11, placing the guide rail 124 within the guide groove and allowing it to slide along the guide groove.

[0074] When finishing the winding 13, the support 11 can be pushed to bring the roller assembly 12 closer to the reel 14. Under the action of the elastic member 123, a thrust is generated on the winding 13 on the reel 14. Under the reaction of the winding 13, the guide rail 124 is pushed to slide relative to the support 11, so that the multiple roller assemblies 12 can dynamically fit against the winding 13.

[0075] In the above embodiments, the guide rail 124 and the elastic element 123 are combined to support the smoothing roller 122, which can reduce the swaying or tilting of the smoothing roller 122 and improve the structural stability of the roller assembly 12. Moreover, the guide rail 124 can effectively guide and constrain the movement trajectory of the smoothing roller 122, so that it can move stably in a predetermined direction under the action of the elastic element 123, thereby improving the accuracy and reliability of the smoothing operation.

[0076] like Figure 7 As shown, Figure 7 This is a schematic diagram of the smoothing device provided in some embodiments of this application. Optionally, the connecting part 121 may further include a guide rail 124 and a slider 125 that are slidably connected. One end of the guide rail 124 is connected to the support member 11. The extension direction of the guide rail 124 is the same as the extension direction of the elastic member 123. The smoothing roller 122 is rotatably connected to the slider 125.

[0077] One end of the elastic element 123 can be connected to the support element 11, and the other end of the elastic element 123 can be connected to the slider 125. The connecting part 121 includes a structure of guide rail 124 and slider 125. The guide rail 124 is arranged along the extension and retraction direction of the elastic element 123. The slider 125 forms a sliding engagement with the guide rail 124. The smoothing roller 122 is connected to the slider 125 by a rotatable connection. The rotatable connection between the smoothing roller 122 and the slider 125 allows the smoothing roller 122 to roll autonomously during movement. The guide rail 124 provides a guide path for the slider 125 to move in a specific direction. When the slider 125 reciprocates on the guide rail 124, it can drive the smoothing roller 122 to move synchronously.

[0078] The sliding engagement between the guide rail 124 and the slider 125 ensures that the smoothing roller 122 maintains stable directionality during movement, reducing uneven contact pressure caused by misalignment. The synergistic effect of the elastic element 123 and the guide rail 124 enables stable and flexible adjustment of the pressure on the smoothing roller 122.

[0079] In some embodiments, such asFigure 6 and Figure 7 As shown in FIG. 1, the smoothing device 100 can further comprise a driving member 126 connected to the support member 11, which is configured to drive the at least two roller assemblies 12 to move so as to make the smoothing roller 122 approach or move away from the winding member 13.

[0080] The driving member 126 is used to control the displacement of the roller assemblies 12. The driving member 126 can be a pneumatic cylinder or a servo motor, etc. The structure of the driving member 126 is within the scope of understanding of those skilled in the art, and will not be elaborated here.

[0081] The driving member 126 transmits power through the connecting portion 121 to make the smoothing roller 122 approach or move away from the winding shaft 14. The driving member 126 is connected to the support member 11 to drive the plurality of roller assemblies 12 to move through the support member 11, so that the simultaneous control of the plurality of roller assemblies 12 can be realized by a single driving member 126.

[0082] The displacement of the roller assemblies 12 is controlled by the driving member 126, which can make the smoothing roller 122 dynamically fit the winding shaft 14. The driving member 126 cooperates with the elastic member 123 to realize the pressure adjustment function, so that the plurality of roller assemblies 12 fit the winding shaft 14 to form an arc surface. Moreover, the plurality of roller assemblies 12 can adapt to the smoothing requirements of winding shafts 14 with different diameters under the action of the driving member 126, thereby improving the versatility of the smoothing device 100.

[0083] In addition, the driving member 126 can drive the roller assemblies 12 to move away from the winding shaft 14 and the winding member 13, so as to realize zero-touch avoidance during the start and stop of winding and the change of winding, thereby reducing the risk of mechanical collision between the smoothing device 100 and the winding member 13.

[0084] In some embodiments, the width of the smoothing roller 122 along the first direction is not less than the width of the winding member 13 along the first direction, wherein the first direction is the axial direction of the smoothing roller 122.

[0085] That is, the axial width of the smoothing roller 122 is greater than or equal to the axial width of the winding member 13. During the winding of the winding member 13 by the winding shaft 14, the contact part of the smoothing roller 122 with the winding member 13 on the winding shaft 14 can completely cover the width direction of the winding member 13.

[0086] By setting the axial width of the smoothing roller 122 to be greater than or equal to the axial width of the winding member 13, the winding member 13 can be completely fitted with the winding shaft 14 in the width direction, thereby reducing the sliding deviation caused by insufficient local contact, and improving the winding quality of the winding member 13.

[0087] In some embodiments, as shown in FIG. 1, the plurality of roller assemblies 12 are arranged in a circular array around the winding shaft 14. Figure 7As shown, the diameter of the smoothing roller 122 is d1, and the diameter of the winding shaft 14 is d2, where d1≤d2 / 4.

[0088] The diameter of the smoothing roller 122 is designed to be no more than one fourth of the diameter of the winding shaft 14. In specific embodiments, a plurality of combinations of diameters that meet the ratio can be used, such as the diameter d1 of the smoothing roller 122 being one fourth of the diameter d2 of the winding shaft 14, or the diameter d1 of the smoothing roller 122 being one fifth of the diameter d2 of the winding shaft 14, etc. With such a design, the arrangement of the smoothing rollers 122 can meet the condition that at least four smoothing rollers 122 simultaneously contact the winding shaft 14.

[0089] By controlling the diameter of the smoothing roller 122 to be within one fourth of the diameter of the winding shaft 14, the smaller diameter of the smoothing roller 122 allows the plurality of smoothing rollers 122 to be evenly distributed on the surface of the entry side of the winding shaft 14. This size relationship also allows there to be at least four evenly distributed contact points of the smoothing rollers 122 in the contact area of the winding shaft 14, so that sufficient pressure is maintained while the risk of scratching caused by excessive local pressure is reduced.

[0090] In some embodiments, the central axis of the winding shaft 14 is horizontally arranged, and at least one of the contact points of the smoothing roller 122 of the at least two roller assemblies 12 with the wound piece 13 is located obliquely above the central axis of the winding shaft 14, and at least another is located obliquely below the central axis of the winding shaft 14.

[0091] At least one contact point of the smoothing roller 122 with the wound piece 13 is located obliquely above the central axis of the winding shaft 14, and another is located obliquely below. The obliquely above and obliquely below contact positions can allow the smoothing roller 122 to form an arc surface fit with the winding shaft 14. In specific embodiments, the plurality of smoothing rollers 122 can be distributed along the circumference of the winding shaft 14 on the entry side of the winding shaft 14. The included angle between the line connecting the centers of the uppermost smoothing roller 122 and the lowermost smoothing roller 122 and the center of the winding shaft 14 is not less than 120 degrees, so that the effective area of the smoothing roller 122 can be increased, and the smoothing effect of the smoothing device 100 can be improved.

[0092] The plurality of smoothing rollers 122 form multi-point rolling contact with the winding shaft 14, and can form an arc surface fit. The obliquely above contact point of the winding shaft 14 can apply a downward pressure to the wound piece 13, so that the wound piece 13 can be fitted with the winding shaft 14 when entering. The obliquely below contact point can generate an upward lifting force on the tail of the wound piece 13. With such a design, when the tail of the wound piece 13 moves to the entry area of the winding shaft 14, it will not fall off under the action of gravity. The arc surface fit design of the at least two smoothing rollers 122 makes the winding operation of the winding shaft 14 more stable, reduces the slippage of the tail of the wound piece 13, and improves the winding quality and yield of the wound piece 13.

[0093] Optionally, the smoothing device 100 can comprise three roller assemblies 12, wherein the smoothing rollers 122 of the three roller assemblies 12 are located above, below and horizontally aligned with the central axis of the winding shaft 14, respectively. The three roller assemblies 12 can be equidistantly spaced. In this way, the tail of the winding piece 13 can be smoothed by the smoothing rollers 122 when entering the upper, middle and lower part of the feeding area of the winding shaft 14, thereby reducing the slip of the winding piece 13 in the width direction when winding, and improving the winding quality of the winding piece 13.

[0094] In some embodiments, as shown in Figure 8 , Figure 8 is a structural schematic diagram of a smoothing device provided by yet some other embodiments of the present application. At least one set of adjacent smoothing rollers 122 is provided with a smoothing plate 127.

[0095] The smoothing plate 127 can be arranged at the gap between adjacent smoothing rollers 122. The smoothing plate 127 can be displaced synchronously with the roller assembly 12. The smoothing plate 127 can also be fixed on the support 11, so that the same driving member 126 can drive the roller assembly 12 and the smoothing plate 127 simultaneously, simplifying the structure of the smoothing device 100 and saving the cost of the smoothing device 100.

[0096] The smoothing roller 122 is a roller structure for smoothing the winding piece 13, and the smoothing plate 127 is a plate structure arranged between adjacent smoothing rollers 122. The smoothing plate 127 can cooperate with the smoothing roller 122 to provide a contact surface during the tailing of the winding piece 13. The inclination angle of the smoothing plate 127 can be set according to actual needs.

[0097] The smoothing plate 127 is arranged between adjacent smoothing rollers 122, and when the winding piece 13 moves to the gap between the two adjacent smoothing rollers 122, the smoothing plate 127 can smooth the winding piece 13, optimizing the smoothing mode of the smoothing device 100. The plate structure of the smoothing plate 127 can directionally guide the tail of the winding piece 13, reducing the slip of the winding piece 13 in the width direction. The combined structure of the smoothing roller 122 and the smoothing plate 127 increases the coverage range of the smoothing device 100, which can not only reduce the peeling of the coating of the winding piece 13 by rolling friction, but also enhance the smoothing effect by the action of the smoothing plate 127. In this way, the alignment accuracy of the winding piece 13 can be improved, thereby improving the overall winding quality of the winding piece 13.

[0098] In some embodiments, as shown in Figure 8 , the smoothing plate 127 can be curved.

[0099] The smoothing plate 127 is designed with a curved structure. For example, the smoothing plate 127 can be arc-shaped, and its bending direction can be the same as the bending direction of the winding shaft 14. The curved smoothing plate 127 can form continuous contact with the winding member 13 during operation.

[0100] The curved surface can disperse the contact pressure between the winding 13 and the flat plate 127, reduce the local scratching force on the winding 13, and thus reduce the risk of scratching the winding 13.

[0101] In some embodiments, such as Figure 9 As shown, Figure 9 yes Figure 4 The diagram shows a structural schematic of an embodiment of the smoothing roller in the smoothing device. The smoothing roller 122 may include a roller body 1221 and a flexible layer 1222 disposed on the outer surface of the roller body 1221, wherein the hardness of the flexible layer 1222 is less than the hardness of the roller body 1221.

[0102] The roller body 1221 can be made of metal or rigid plastic, while the flexible layer 1222 can be made of elastic materials such as rubber, silicone, or polyurethane. The flexible layer 1222 can be fixed to the outer surface of the roller body 1221 by means of bonding, vulcanization, or coating to form a rollable contact surface. In specific implementations, flexible layers 1222 of different thicknesses can be used to adjust the contact pressure, or the hardness value can be adjusted by changing the material ratio of the flexible layer 1222.

[0103] By incorporating a roller body 1221 with a hardness difference and a flexible layer 1222, the elastic properties of the flexible layer 1222 effectively buffer contact pressure, reducing the risk of coating peeling off the wound part 13 due to friction. Simultaneously, the elastic deformation of the surface of the flexible layer 1222 can disperse localized stress, reducing scratches on hard surfaces. When the flexible layer 1222 rotates, coating material peeling off the wound part 13 is less likely to accumulate in localized areas and form hard foreign objects. This structural design meets the smoothing requirements and also reduces the quality risk of the wound part 13 through material properties. Optionally, the flexible layer 1222 can be detachably disposed on the surface of the roller body 1221, and the replaceability of the flexible layer 1222 can extend the service life of the smoothing device 100.

[0104] In some embodiments, the flexible layer 1222 may include a rubber layer.

[0105] The flexible layer 1222 can be made of rubber, such as nitrile rubber. The rubber layer can reduce friction when in contact with the wound element 13 through its own elastic deformation. The thickness and hardness of the rubber layer can be adjusted according to actual application requirements, and the rubber layer can also enhance its wear resistance through a multi-layer composite structure.

[0106] The flexible layer 1222 made of rubber material can effectively reduce the friction coefficient with the winding piece 13 and reduce the peeling of the coating on the winding piece 13. The elastic property of the rubber layer can make the contact surface more closely adhere to the surface of the winding piece 13, reducing the risk of scratches caused by direct contact of hard materials. Moreover, the rubber layer has good elastic buffering capacity, and its flexible nature can effectively absorb mechanical impact energy. When subjected to external pressure, the reversible deformation mechanism of the rubber molecular chain can convert concentrated stress into more uniform surface pressure, significantly reducing the peak stress of the contact interface. The rubber layer can balance the support and flexibility to reduce the collapse of the flexible layer 1222.

[0107] Please refer to Figure 6 In some embodiments, the flattening device 100 includes a flattening roller 122, an elastic member 123, a guide rail 124, and a driving member 126. The guide rail 124 is in sliding connection with the support member 11, and one end of the guide rail 124 can pass through the support member 11. The elastic member 123 includes a spring that can adjust the pressure of the flattening roller 122 and the winding shaft 14. The flattening roller 122 is rotatably arranged at the end of the guide rail 124 and the spring, and is supported by the guide rail 124 and the spring. The driving member 126 is a pneumatic cylinder, and the winding piece 13 is a stack of pole pieces and diaphragms.

[0108] When the winding shaft 14 is winding up the winding piece 13, the pole pieces and diaphragms pass through the flattening device 100, and the pneumatic cylinder extends to push out the flattening roller 122 to push the pole pieces and diaphragms onto the winding shaft 14 for winding up, reducing the sliding of the pole pieces and diaphragms in the width direction. The flattening roller 122 is rotated by the winding piece 13 during winding, and the flattening roller 122 and the winding piece 13 are in rolling contact. This way, the peeling of the coating on the diaphragm can be significantly reduced, and due to the rotation of the flattening roller 122, the peeled coating will not accumulate as foreign matter in the local part of the flattening roller 122, thereby reducing the damage to the pole pieces and diaphragms.

[0109] In summary, the flattening device 100 of the above embodiments can be used to flatten the winding piece 13 when the winding shaft 14 is winding up. The distributed contact parts are constructed by a plurality of spaced roller assemblies 12, and the spaced contact parts make the force on the winding piece 13 more uniform, reducing the possibility of the winding piece 13 sliding in the width direction and improving the fitting accuracy when the winding piece 13 is winding up, thereby improving the winding quality of the winding piece 13. The flattening roller 122 and the winding piece 13 form rolling frictional contact, effectively reducing the contact stress and reducing the damage to the winding piece 13 and the risk of peeling of the coating on the winding piece 13. At the same time, the rotation design of the flattening roller 122 can timely remove the peeled coating, reducing its accumulation in the local part of the flattening roller 122, and further reducing the probability of scratching the winding piece 13.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A smoothing device, characterized in that, The smoothing device includes: Support components At least two roller assemblies, the at least two roller assemblies being spaced apart, each roller assembly comprising: The connecting part includes an elastic element, one end of which is connected to the support member; A smoothing roller, rotatably disposed at the other end of the elastic member, is configured to contact a wound element on a reel to smooth the wound element by rolling friction. The contact portions of the smoothing rollers of the at least two roller assemblies with the winding element are spaced apart along the winding direction of the roll.

2. The smoothing device according to claim 1, characterized in that, The connecting part also includes a guide rail, the extension direction of which is the same as the extension direction of the elastic member, one end of the guide rail is slidably connected to the support member, and the smoothing roller is rotatably disposed at the other end of the guide rail.

3. The smoothing device according to claim 1, characterized in that, The connecting part further includes a sliding guide rail and a slider. One end of the guide rail is connected to the support member. The extension direction of the guide rail is the same as the extension direction of the elastic member. The smoothing roller is rotatably connected to the slider.

4. The smoothing device according to any one of claims 1-3, characterized in that, The smoothing device further includes a drive member connected to the support member, the drive member being configured to drive the at least two roller assemblies to move the smoothing rollers closer to or further away from the reel.

5. The smoothing device according to claim 1, characterized in that, The width of the smoothing roller along the first direction is not less than the width of the winding member along the first direction, wherein the first direction is the axial direction of the smoothing roller.

6. The smoothing device according to claim 1, characterized in that, The smoothing roller has a diameter of d1, and the roll has a diameter of d2, wherein d1 ≤ d2 / 4.

7. The smoothing device according to claim 1, characterized in that, The central axis of the reel is horizontally arranged, and at least one of the contact portions of the smoothing rollers of the at least two roller assemblies with the winding member is located obliquely above the central axis of the reel, and at least the other is located obliquely below the central axis of the reel.

8. The smoothing device according to claim 1, characterized in that, A smoothing plate is provided between at least one set of adjacent smoothing rollers.

9. The smoothing device according to claim 8, characterized in that, The flat plate is bent.

10. The smoothing device according to claim 1, characterized in that, The smoothing roller includes: The roller body and a flexible layer disposed on the outer surface of the roller body, wherein the hardness of the flexible layer is less than the hardness of the roller body.

11. The smoothing device according to claim 10, characterized in that, The flexible layer includes a rubber layer.

12. A battery manufacturing apparatus, characterized in that, The battery manufacturing equipment includes a smoothing device as described in any one of claims 1-11.

Images