Roller, film coating machine and battery production line

Abstract

The utility model relates to a roller, a film coating machine and a battery production line. The elastic rings are sequentially stacked in the axial direction of the roller shaft and arranged on the roller shaft in a sleeving mode. And the rolling sleeve is arranged on the outer sides of all the elastic rings in a sleeving manner. According to the roller, the film coating machine and the battery production line disclosed by the embodiment of the invention, the quality of a protective film on a battery monomer can be relatively good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a roller, a film wrapping machine and a battery production line. BACKGROUND

[0002] The outer surface of a battery cell is usually wrapped with a protective film, which can protect the battery cell and make the appearance of the battery cell more beautiful. At present, the battery cell is wrapped by a film wrapping machine.

[0003] However, the roller on the film wrapping machine cannot closely adhere to the battery cell during use, resulting in poor quality of the protective film on the battery cell. SUMMARY

[0004] Therefore, it is necessary to provide a roller, a film wrapping machine and a battery production line to solve the problem of poor quality of the protective film on the battery cell.

[0005] The first aspect of the present application provides a roller, comprising: a roller shaft; a plurality of elastic rings, which are sequentially stacked along the axial direction of the roller shaft and are sleeved on the roller shaft; and a roller pressing sleeve, which is sleeved on the outside of all the elastic rings.

[0006] By arranging a plurality of elastic rings, the elastic rings are sleeved on the roller shaft and can independently elastically deform along the radial direction of the roller shaft. When there is an abnormality such as a deformation bump on the shell of the battery cell, part of the roller pressing sleeve is pressed, and the corresponding elastic ring can elastically deform along the radial direction. The other areas of the shell remain normal, so that the elastic rings corresponding to the other areas still maintain a normal working state, and the roller can be attached to the shell of the battery cell as a whole to complete the film wrapping, ensuring that the protective film on the battery cell has good quality and effectively avoiding the occurrence of wrinkles, bubbles and other adverse conditions in the protective film on the battery cell.

[0007] In one embodiment, each of the elastic rings comprises an inner ring, a spring piece and an outer ring; the inner ring is fixedly sleeved on the outer circumferential surface of the roller shaft, the outer ring is sleeved on the outside of the inner ring, and the two ends of the spring piece are connected to the outer ring and the inner ring, respectively; and the roller pressing sleeve is sleeved on the outer ring of the elastic ring. In this way, the roller can be attached to the shell of the battery cell as a whole to complete the film wrapping, ensuring that the protective film attached to the battery cell has good quality and effectively avoiding the occurrence of wrinkles, bubbles and other adverse conditions in the protective film on the battery cell.

[0008] In one embodiment, the inner ring and the roller shaft are in interference fit.

[0009] In one of the embodiments, the elastic sheet is made of steel alloy or aluminum alloy; and / or, one end of the elastic sheet is welded to the inner ring; and / or, the other end of the elastic sheet is welded to the outer ring.

[0010] In one of the embodiments, each of the elastic rings comprises a plurality of the elastic sheets, all of which are arranged in the annular region between the inner ring and the outer ring of the elastic ring in which the elastic sheet is located; and / or, the elastic sheet comprises a first branch and a second branch which are integrally connected, the first branch is connected to the inner ring at the end away from the second branch, the second branch is connected to the outer ring at the end away from the first branch, and the first branch and the second branch are arranged at an angle.

[0011] In one of the embodiments, the outer ring is in interference fit with the roller sleeve.

[0012] In one of the embodiments, along the axial direction of the roller shaft, the width of the elastic ring is C, the length of the roller shaft is D, and 0.02D≤C≤0.5D is satisfied; and / or, the diameter of the roller shaft is E, and 10mm≤E≤50mm is satisfied.

[0013] In one of the embodiments, the roller sleeve is made of rubber, nylon, polyurethane or silica gel. In this way, the roller sleeve has good wear resistance, corrosion resistance and elasticity, can effectively protect the surface of the battery monomer 121 from damage, and at the same time provide the necessary friction to achieve the desired rolling effect.

[0014] In one of the embodiments, the roller further comprises two end covers, and the two end covers are respectively fixed at the two ends of the roller shaft and are pressed against the elastic ring. In this way, by arranging the end cover, the connection strength of the roller shaft and the elastic ring can be enhanced, and the elastic ring can be effectively prevented from moving in the axial direction; after installation, the movement of the elastic ring can be effectively limited, and the roller sleeve can be attached to the protective film without affecting the protective film.

[0015] In one of the embodiments, the two ends of the roller shaft are formed with threaded segments, and the end cover has threaded holes matched with the threaded segments.

[0016] The second aspect of the present application provides a film wrapping machine comprising the above-mentioned roller.

[0017] The third aspect of the present application provides a battery production line comprising the above-mentioned film wrapping machine.

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

[0019] Figure 1 The exploded view of the battery cell is provided for some embodiments of the present application.

[0020] Figure 2 The structure diagram of the roller is provided for some embodiments of the present application, wherein the roller sleeve is omitted.

[0021] Figure 3 The installation diagram of the elastic ring and the roller sleeve is provided for some embodiments of the present application.

[0022] Figure 4 The structure diagram of the roller shaft is provided for some embodiments of the present application.

[0023] Figure 5 The structure diagram of the elastic ring is provided for some embodiments of the present application.

[0024] Figure 6 The structure diagram of the end cover is provided for some embodiments of the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] Battery cell-121, end cover-122, shell-123, electrode assembly-124, electrode terminal-125;

[0027] Roller shaft-10, elastic ring-20, inner ring-21, elastic sheet-22, first branch-221, second branch-222, outer ring-23, roller sleeve-30, end cover-40. DETAILED DESCRIPTION

[0028] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with 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.

[0029] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of the present application, if these technical terms "first", "second", etc. appear, these terms are only used for the purpose of description, 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 technical features indicated.

[0031] Reference within this document 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 appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be combined with any of the other embodiments unless explicitly stated otherwise.

[0032] In the description of the embodiments of the present application, the term "and / or" is merely used to describe associated objects, and can represent that three conditions can exist, for example, A and / or B can mean that the three conditions of A alone, A and B, and B alone can exist. In addition, the character " / " in this document generally indicates that the associated objects before and after the " / " have an "or" relationship.

[0033] In the description of the embodiments of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two (including two), for example, two, three, and the like, unless otherwise explicitly specified. Similarly, if the term "multiple groups" appears, "multiple groups" refers to two groups or more (including two groups), and if the term "multiple pieces" appears, "multiple pieces" refers to two pieces or more (including two pieces).

[0034] In the description of the embodiments of the present application, if these 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, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, if the technical terms "mounting", "connecting", "connecting", "fixing", and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it 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.

[0036] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

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

[0039] In the related art, the surface of the battery monomer in the power battery often adopts a film wrapping machine to attach a protective film; the protective film is generally used before the battery Pack, and the main function is insulation protection. There are also used in the surface of the battery before drying, the main function is to protect the surface of the battery from being scratched and corroded by electrolyte, which is an indispensable part of the battery production process.

[0040] But due to the possible deformation (bulge, etc.) on the shell of the battery monomer, and the overall hardness of the roller of the film wrapping machine is large, and the deformation after stress is small, when the bulge on the shell of the battery monomer is contacted, the other part of the roller fails to maintain full contact with the shell of the battery monomer, so that part of the roller cannot tightly attach the protective film on the shell of the battery monomer, thereby causing the protective film on the battery monomer to produce wrinkles, bubbles and other adverse conditions.

[0041] In order to alleviate the problem of poor quality of the protective film on the battery monomer, a plurality of elastic rings can be arranged on the roller shaft, each elastic ring can independently deform along the radial direction of the roller shaft, when there is a deformation bump or other abnormalities on the shell of the battery monomer, part of the elastic ring deforms elastically, while the other part of the elastic ring remains unchanged, so that the roller can be attached to the shell of the battery monomer as a whole to complete the film coating, and the quality of the protective film on the battery monomer is ensured to be better.

[0042] The embodiments of the present application provide a roller, a film coating machine and a battery production line for coating a protective film on a shell of a battery monomer. The battery monomer is part of a battery, and the battery can be used in an electric device. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0043] For the sake of brevity, an electric device of the embodiments of the present application is taken as an example for description.

[0044] The vehicle can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle is internally provided with a battery, which can be arranged at the bottom, head or tail of the vehicle. The battery can be used for power supply of the vehicle, for example, the battery can be used as an operating power source of the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery to supply power to the motor, for example, for the working power demand of the vehicle during starting, navigation and driving.

[0045] In some embodiments of the present application, the battery can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0046] In order to meet different power demand, the battery can include a plurality of battery monomers 121 and a box body. The battery monomer 121 refers to the smallest unit that constitutes a battery module or a battery pack. The plurality of battery monomers 121 can be connected in series and / or parallel through electrode terminals to be applied to various application occasions.

[0047] The box is used to accommodate the battery monomer 121 or the battery module to avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer 121. The box can adopt various structures. In some embodiments, the box can include a first part and a second part, the first part and the second part are mutually covered, and the first part and the second part jointly define an accommodation space for accommodating the battery monomer 121. The second part can be a hollow structure with one end open, and the first part can be a plate-shaped structure, which is covered on the open side of the second part to jointly define the accommodation space with the second part; the first part and the second part can also be hollow structures with one side open, and the open side of the first part is covered on the open side of the second part. Of course, the box formed by the first part and the second part can be various shapes, such as a simple solid structure of a cuboid or a cylinder or a sphere alone, or a complex solid structure composed of a cuboid or a cylinder or a sphere, and the embodiments of the present application are not limited thereto. The material of the box can be an alloy material such as aluminum alloy or iron alloy, or a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited thereto.

[0048] In the embodiments of the present application, the plurality of battery monomers 121 can directly form a battery pack, or can first form a battery module, and the battery module forms a battery pack. Specifically, the plurality of battery monomers 121 can be directly connected in series or in parallel or in a mixed manner to form a whole, and the whole formed by the plurality of battery monomers 121 is accommodated in the box. Alternatively, the plurality of battery monomers 121 can first be connected in series or in parallel or in a mixed manner to form a battery module, and the plurality of battery modules are connected in series or in parallel or in a mixed manner to form a whole, which is accommodated in the box.

[0049] The battery can further include other structures, for example, the battery can further include a busbar component for realizing the electrical connection between the plurality of battery monomers 121.

[0050] Each battery monomer 121 can be a secondary battery or a primary battery; can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery monomer 121 can be in the shape of a cylinder, a flat body, a cuboid or other shapes. The battery monomer 121 is generally divided into three types according to the packaging method: cylindrical battery monomers, cuboid square battery monomers and soft package battery monomers, and the embodiments of the present application are not limited thereto. However, for the sake of simplicity, the embodiments described below will be described by taking the cuboid square lithium-ion battery monomer 121 as an example.

[0051] Please refer to Figure 1 , Figure 1A decomposition structure diagram of a battery cell 121 is provided for some embodiments of the present application. The battery cell 121 includes an end cover 122, a shell 123, an electrode assembly 124, and other functional components.

[0052] The end cover 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cover 122 can be adapted to the shape of the shell 123 to fit the shell 123. Optionally, the end cover 122 can be made of a material with certain hardness and strength, such as an aluminum alloy, so that the end cover 122 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 121 to have higher structural strength and improved safety performance. The end cover 122 can be provided with functional components such as an electrode terminal 125. The electrode terminal 125 can be used to electrically connect with the electrode assembly 124 for outputting or inputting the electrical energy of the battery cell 121. In some embodiments, the end cover 122 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 121 when the internal pressure or temperature reaches a threshold value. The material of the end cover 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 122, which can be used to isolate the electrical connection components in the shell 123 from the end cover 122 to reduce the risk of short circuit. For example, the insulating piece can be plastic, rubber, etc.

[0053] The shell 123 is a component for fitting the end cover 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can be used to accommodate the electrode assembly 124, electrolyte, and other components. The shell 123 and the end cover 122 can be independent components, and an opening can be provided on the shell 123, and the end cover 122 is covered on the opening to form the internal environment of the battery cell 121. Without limitation, the end cover 122 and the shell 123 can also be integrated, specifically, the end cover 122 and the shell 123 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 123, the end cover 122 is covered on the shell 123. The shell 123 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The material of the shell 123 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application.

[0054] The electrode assembly 124 is a component in which electrochemical reactions occur in the battery cell 121. One or more electrode assemblies 124 can be included within the casing 123. The electrode assembly 124 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally 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 that constitute a main body of the electrode assembly 124, and portions without active materials that each constitute a tab (not shown). The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs connect the electrode terminal 125 to form a current loop.

[0055] Figure 2 A structural schematic diagram of a roller provided for some embodiments of the present application. Figure 3 A mounting schematic diagram of an elastic ring and a roller pressing sleeve provided for some embodiments of the present application.

[0056] Referring to Figures 1 to 3 The first aspect of the present application provides a roller, comprising: a roller shaft 10, a plurality of elastic rings 20, and a roller pressing sleeve 30.

[0057] The plurality of elastic rings 20 are sequentially stacked along the axial direction of the roller shaft 10 and are sleeved on the roller shaft 10, and the roller pressing sleeve 30 is sleeved on the outside of all the elastic rings 20.

[0058] The roller pressing sleeve 30 can be made of a polyurethane material that is wear-resistant and corrosion-resistant, is sleeved on the outside of all the elastic rings 20, and on the one hand protects the elastic rings 20 and on the other hand can be used to directly wind a protective film and attach the protective film to the casing 123 of the battery cell 121. The protective film can protect the battery cell 121 and make the appearance of the battery cell 121 more beautiful.

[0059] By sleeving the plurality of elastic rings 20 on the roller shaft 10, each elastic ring 20 can independently elastically deform along the radial direction of the roller shaft 10. When there is an abnormality such as a deformation bump on the casing 123 of the battery cell 121, part of the roller pressing sleeve 30 is pressed and causes the corresponding elastic ring 20 to elastically deform along the radial direction, while the other areas of the casing 123 remain normal, thereby ensuring that the elastic rings 20 corresponding to the other areas still remain in a normal working state, and the roller pressing sleeve 30 is attached to the casing 123 of the battery cell 121 as a whole, thereby completing the film attachment and ensuring that the protective film on the battery cell 121 has good quality and effectively avoids the occurrence of adverse conditions such as wrinkles and bubbles in the protective film on the battery cell 121.

[0060] Figure 5 A structural schematic diagram of an elastic ring provided for some embodiments of the present application.

[0061] In some possible embodiments, see Figure 2 , Figure 3 and Figure 5 As shown, each elastic ring 20 includes an inner ring 21, a spring sheet 22, and an outer ring 23; the inner ring 21 is fixedly sleeved on the outer circumferential surface of the roller shaft 10, the outer ring 23 is sleeved on the outside of the inner ring 21, and the two ends of the spring sheet 22 are respectively connected to the outer ring 23 and the inner ring 21; the roller pressing sleeve 30 is sleeved on the outer ring 23 of the elastic ring 20.

[0062] The inner ring 21 and the outer ring 23 can be concentrically set as a whole. The inner diameter of the outer ring 23 is larger than the outer diameter of the inner ring 21. The inner ring 21 is fixedly sleeved on the outer circumferential surface of the roller shaft 10, thereby ensuring that the inner ring 21 and the roller shaft 10 are relatively fixed. The roller sleeve 30 is sleeved on the cylindrical surface formed by all the outer rings 23.

[0063] When there are abnormalities such as deformation or bulging on the casing 123 of the battery cell 121, part of the roller sleeve 30 is squeezed, causing the outer ring 23 of the corresponding elastic ring 20 to deform radially. The two ends of the spring piece 22 are connected to the outer ring 23 and the inner ring 21 respectively, thereby providing elastic support to the outer ring 23 and the inner ring 21. Other areas of the casing 123 remain normal, thereby ensuring that the elastic ring 20 corresponding to other areas still maintains normal working state, and enabling the roller to be attached to the casing 123 of the battery cell 121 as a whole to complete the film application, ensuring that the quality of the protective film attached to the battery cell 121 is good, and effectively avoiding defects such as wrinkles and bubbles in the protective film on the battery cell 121.

[0064] In some possible embodiments, see Figure 2 , Figure 3 and Figure 5 As shown, the inner ring 21 is made of steel alloy or aluminum alloy; it has good structural strength and processing performance, thus meeting the needs of the roller in various complex working environments and extending its service life.

[0065] In some possible embodiments, see Figure 2 , Figure 3 and Figure 5 As shown, the inner ring 21 is interference-fitted with the roller shaft 10; thus, not only is the structure simple, but the fixing of the inner ring 21 and the roller shaft 10 can also be effectively achieved. In some other embodiments, the inner ring 21 and the roller shaft 10 can also be fixed by welding. In some other embodiments, the interference fit between the inner ring 21 and the roller shaft 10 and the further fixing by welding have good structural strength and effectively achieve the fixing of the inner ring 21 and the roller shaft 10.

[0066] In some possible embodiments, see Figure 2 , Figure 3 and Figure 5As shown, the thickness of the inner ring 21 is A, which satisfies 1mm≤A≤5mm; in this way, the inner ring 21 has good structural strength and can avoid cracking for fixing with the roller shaft 10.

[0067] In some possible embodiments, referring to Figure 2 , Figure 3 and Figure 5 As shown, the elastic sheet 22 is made of steel alloy or aluminum alloy; has good structural elasticity and processing performance, thereby providing elastic support for the outer ring 23 and the inner ring 21 to meet the use requirements of the roller in various complex working environments and prolong the service life.

[0068] In some possible embodiments, referring to Figure 2 , Figure 3 and Figure 5 As shown, one end of the elastic sheet 22 is welded to the inner ring 21; has good structural strength and effectively realizes the fixing of the inner ring 21 and the elastic sheet 22. In other embodiments, the other end of the elastic sheet 22 can also be fixed to the outer ring 23 by bolts.

[0069] In some possible embodiments, referring to Figure 2 , Figure 3 and Figure 5 As shown, the other end of the elastic sheet 22 is welded to the outer ring 23; has good structural strength and effectively realizes the fixing of the inner ring 21 and the elastic sheet 22. In other embodiments, the other end of the elastic sheet 22 can also be fixed to the outer ring 23 by bolts.

[0070] In some possible embodiments, referring to Figure 2 , Figure 3 and Figure 5 As shown, each elastic ring 20 includes a plurality of elastic sheets 22, and all the elastic sheets 22 are arranged in the annular region between the inner ring 21 and the outer ring 23 in the elastic ring 20.

[0071] By arranging a plurality of elastic sheets 22 in the elastic ring 20, all the elastic sheets 22 are arranged in the annular region between the inner ring 21 and the outer ring 23 to form a stable support and buffer structure. All the elastic sheets 22 can be arranged in the clockwise or counterclockwise direction, which ensures that the elastic ring 20 can elastically deform in the radial direction no matter which direction it is pressed, so as to adapt to the deformation bump on the shell 123 of the battery monomer 121, make the roller pressing sleeve 30 as a whole adhere to the shell 123 of the battery monomer 121 to complete the film sticking, ensure the quality of the protective film on the battery monomer 121, and effectively avoid the generation of wrinkles, bubbles and other adverse conditions of the protective film on the battery monomer 121.

[0072] In some possible embodiments, referring to Figure 2 ,Figure 3 and Figure 5 As shown in

[0073] The included angle between the first branch 221 and the second branch 222 can be generally set at 150°-180°, which is not limited in the present application.

[0074] In some possible embodiments, as shown in Figure 2 , Figure 3 and Figure 5 The outer ring 23 is made of steel alloy or aluminum alloy; it has good structural strength and processing performance, thereby meeting the use requirements of the roller in various complex working environments and prolonging the service life.

[0075] In some possible embodiments, as shown in Figure 2 , Figure 3 and Figure 5 The outer ring 23 is interference fit with the roller sleeve 30; in this way, not only the structure is simple, but also the fixation of the outer ring 23 and the roller sleeve 30 can be effectively realized. In other embodiments, the outer ring 23 and the roller sleeve 30 can also be fixed by gluing. In other embodiments, the outer ring 23 and the roller sleeve 30 are interference fit and further fixed by gluing, which has good structural strength and effectively realizes the fixation of the outer ring 23 and the roller sleeve 30.

[0076] In some possible embodiments, as shown in Figure 2 , Figure 3 and Figure 5 The thickness of the outer ring 23 is B, which satisfies 1mm≤B≤5mm; in this way, the outer ring 23 has good structural strength and can avoid cracking for fixation with the roller shaft 10.

[0077] Figure 2 The structural schematic diagram of the roller shaft provided in some embodiments of the present application is shown.

[0078] In some possible embodiments, as shown in Figure 3 The roller shaft 10 is made of steel alloy or aluminum alloy; in this way, the roller shaft 10 has good structural strength and processing performance, thereby meeting the use requirements of the roller in various complex working environments and prolonging the service life.

[0079] In some possible embodiments, as shown in Figure 5As shown, the width of the elastic ring 20 along the axial direction of the roller shaft 10 is C, the length of the roller shaft 10 is D, and 0.02D≤C≤0.5D is satisfied. The width C of the elastic ring 20 can generally be 10mm-20mm, and generally 2 to 50 individual elastic rings 20 can be sleeved on one roller shaft 10; by controlling the proportional relationship between the width C of the elastic ring 20 and the length D of the roller shaft 10, it can be ensured that the roller has sufficient elastic deformation capability as a whole, and it can be ensured that the local area of the roller can deform radially when facing the deformation bulge on the shell 123 of the battery monomer 121, so that the roller pressing sleeve 30 as a whole adheres to the shell 123 of the battery monomer 121 to complete the film attachment.

[0080] In addition, the width C of the elastic ring 20 is set to be between 0.02D and 0.5D, which avoids the insufficient rigidity caused by the too wide elastic ring 20, and also prevents stress concentration caused by the too narrow elastic ring 20.

[0081] The diameter of the roller shaft 10 is E, and 10mm≤E≤50mm is satisfied. The diameter of the roller shaft 10 in this range can not only meet the bearing requirements of the roller, but also be convenient for processing, manufacturing and installation and maintenance, and is suitable for various types of battery monomers 121 to attach protective films.

[0082] In some possible embodiments, referring to Figure 2 As shown, the roller pressing sleeve 30 is made of rubber, nylon, polyurethane or silicone. The roller pressing sleeve 30 is used for attaching the protective film to the battery monomer 121, and the material of the roller pressing sleeve 30 should have a certain elasticity. The roller pressing sleeve 30 is made of high molecular materials such as rubber, nylon, polyurethane or silicone, and has good wear resistance, corrosion resistance and elasticity, which can effectively protect the surface of the battery monomer 121 from damage, and at the same time provide the necessary friction to achieve the required roller pressing effect. In particular, the polyurethane material has excellent wear resistance and elastic recovery capability, which can effectively improve the roller pressing precision, thereby effectively completing the film attachment work of the protective film on the battery monomer 121.

[0083] Figure 3 The structure schematic diagram of the end cover provided for some embodiments of the present application is shown.

[0084] In some possible embodiments, referring to Figure 5 As shown, the roller further includes two end covers 40, and the two end covers 40 are respectively fixed at the two ends of the roller shaft 10 and press against the elastic ring 20.

[0085] The end cover 40 is tightly installed at the two ends of the roller shaft 10, and the connection mode can be bolt connection, welding or interference fit; by arranging the end cover 40, the connection strength of the roller shaft 10 and the elastic ring 20 can be enhanced, and the elastic ring 20 can be effectively prevented from moving in the axial direction; after installation, it can effectively limit the movement of the elastic ring 20, and will not affect the attachment of the roller pressing sleeve 30 to the protective film.

[0086] In some possible embodiments, referring to Figure 2 Figure 3 Figure 5 Figure 2 Figure 3 Figure 5 Figure 2 Figure 3 Figure 5 Figure 4 Figures 2 to 4 Figures 2 to 4 Figures 2 to 4 Figure 6 Figures 1 to 6 Figures 1 to 6 As shown, the two ends of the roller shaft 10 are formed with threaded segments 11, and the end caps 40 have threaded holes 41 that cooperate with the threaded segments 11. The threaded holes 41 are screwed with the threaded segments 11 to fix the end caps 40, and make the end caps 40 tightly installed at the two ends of the roller shaft 10, and effectively prevent the elastic ring 20 from moving in the axial direction, and ensure that the movement of the elastic ring 20 is effectively limited after installation, and the roller pressing sleeve 30 does not affect the attachment of the protective film. In some other embodiments, the roller shaft 10 and the end cap 40 can be fixed by welding, and the specific design is subject to the design.

[0087] The second aspect of the present application provides a film wrapping machine, comprising the roller described above.

[0088] The third aspect of the present application provides a battery production line, comprising the film wrapping machine described above.

[0089] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0090] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A roller characterized in that, The roller comprises: a roller shaft (10); a plurality of elastic rings (20) stacked along the axial direction of the roller shaft (10) and sleeved on the roller shaft (10); and a roller sleeve (30) sleeved on the outside of all the elastic rings (20).

2. The roller of claim 1, wherein Each of the elastic rings (20) comprises an inner ring (21), elastic pieces (22) and an outer ring (23); the inner ring (21) is fixedly sleeved on the outer circumferential surface of the roller shaft (10), the outer ring (23) is sleeved on the outside of the inner ring (21), and the two ends of the elastic pieces (22) are connected to the outer ring (23) and the inner ring (21) respectively; the roller sleeve (30) is sleeved on the outer ring (23) of the elastic ring (20).

3. The roller of claim 2, wherein The inner ring (21) is in interference fit with the roller shaft (10).

4. The roller of claim 2, wherein The elastic pieces (22) are made of steel alloy or aluminum alloy; and / or, One end of the elastic piece (22) is welded to the inner ring (21); and / or, The other end of the elastic piece (22) is welded to the outer ring (23).

5. The roller of claim 2, wherein Each of the elastic rings (20) comprises a plurality of elastic pieces (22), and all the elastic pieces (22) are arranged in the annular region between the inner ring (21) and the outer ring (23) in the elastic ring (20) where the elastic piece (22) is located; and / or, The elastic piece (22) comprises a first branch piece (221) and a second branch piece (222) connected integrally, one end of the first branch piece (221) away from the second branch piece (222) is connected to the inner ring (21), one end of the second branch piece (222) away from the first branch piece (221) is connected to the outer ring (23), and the first branch piece (221) and the second branch piece (222) are arranged at an included angle.

6. The roller of claim 2, wherein The outer ring (23) is in interference fit with the roller sleeve (30).

7. The roller according to any one of claims 1 to 6, characterized in that In the axial direction of the roller shaft (10), the width of the elastic ring (20) is C, the length of the roller shaft (10) is D, and 0.02D≤C≤0.5D is satisfied; and / or, The diameter of the roller shaft (10) is E, and 10mm≤E≤50mm is satisfied.

8. The roller of any one of claims 1 to 6, wherein The roller sleeve (30) is made of rubber, nylon, polyurethane or silica gel.

9. The roller of any one of claims 1 to 6, wherein The roller further comprises two end covers (40), and the two end covers (40) are fixed at the two ends of the roller shaft (10) and press against the elastic ring (20).

10. The roller of claim 9, wherein The two ends of the roller shaft (10) are formed with threaded sections (11), and the end covers (40) have threaded holes (41) matched with the threaded sections (11).

11. A wrapping machine characterized by The roller as claimed in any one of claims 1 to 10.

12. A battery production line, characterized by The film coating machine as claimed in claim 11.

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