Rubber coating mechanism and battery production line body

Abstract

The utility model discloses a rubber coating mechanism and a battery production line body, and relates to the technical field of lithium battery manufacturing, the rubber coating mechanism is used for coating a cylindrical battery with rubber, the cylindrical battery comprises a peripheral surface and an end surface, the end surface is provided with a tab, the rubber coating mechanism comprises a driving wheel, a rubber folding wheel and a rubber pressing wheel, the rubber folding wheel comprises a first supporting part and a rubber folding part connected with the first supporting part, and the rubber pressing wheel is connected with the driving wheel; the glue pressing wheel comprises a second supporting part and a glue pressing part connected with the second supporting part, and the driving wheel, the first supporting part and the second supporting part are matched to form a containing space; the driving wheel is used for driving the cylindrical battery to rotate, and the glue folding part and the glue pressing part are distributed at intervals in the rotating direction of the cylindrical battery and are both arranged close to the end face. According to the rubber coating mechanism, rubber coating, rubber folding and rubber pressing are combined into one station, so that the structure of a battery production line body is simplified, the equipment cost and the occupied area are reduced, the production takt is shortened, and the production efficiency is improved.

Description

Encapsulation mechanism and battery production line body Technical Field

[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to an encapsulation mechanism and a battery production line. Background Technology

[0002] In the manufacturing process of lithium batteries, it is necessary to coat the end face and peripheral surface of the battery cell with glue. In related technologies, the battery production line body has low efficiency in coating battery cells. Summary of the Invention

[0003] The main objective of this application is to propose a coating mechanism and a battery production line body, which aims to at least improve the technical problem of low coating efficiency of battery cells in the battery production line body.

[0004] To achieve the above objectives, this application provides a coating mechanism for coating cylindrical batteries. The cylindrical battery includes a peripheral surface and an end surface, with tabs provided on the end surface. The coating mechanism includes a drive wheel, a folding wheel, and a pressing wheel. The folding wheel includes a first support portion and a folding part connected to the first support portion. The pressing wheel includes a second support portion and a pressing part connected to the second support portion. The drive wheel, the first support portion, and the second support portion cooperate to form a receiving space. The drive wheel drives the cylindrical battery to rotate by frictional engagement with the peripheral surface. The folding part and the pressing part are distributed at intervals along the rotation direction of the cylindrical battery and are both located close to the end surface.

[0005] By integrating the traditionally multi-station processes of encapsulation, folding, and flattening into a single station for simultaneous completion, this encapsulation mechanism utilizes the rotation of the cylindrical battery itself as a power source. Fixed folding and pressing rollers follow the movement to complete the folding and pressing actions, simplifying the battery production line structure, reducing equipment costs and floor space, shortening production cycle time, and improving production efficiency.

[0006] In some embodiments, the overmolding mechanism further includes a support wheel, wherein the first support portion and the second support portion are both disposed on the side of the peripheral surface close to the end face, and the support wheel is disposed on the side of the peripheral surface away from the end face, and the support wheel, the first support portion and the second support portion support the peripheral surface at the same horizontal height.

[0007] By adding support wheels that work in conjunction with the support parts of the folding and pressing wheels, a more complete and stable multi-point support system for the cylindrical battery is formed. This effectively reduces the risk of positional shift or vibration of the cylindrical battery when it rotates at high speed or is subjected to force, and ensures a constant distance between the folding and pressing parts and the end face of the cylindrical battery. This ensures a stable and consistent folding angle and flattening effect, further improving the coating quality and yield.

[0008] In some embodiments, the overmolding mechanism further includes a plurality of drive components, each drive component including a drive member and a buffer structure connected to the output shaft of the drive member, and the support wheel, the pressing wheel and the folding wheel are each connected to one of the buffer structures.

[0009] By configuring drive components with buffer structures for the support rollers, pressure rollers, and folding rollers, flexible clamping and support of cylindrical batteries are achieved. The buffer structures effectively accommodate the manufacturing tolerances of the cylindrical batteries in terms of diameter and roundness, as well as dynamic movement during rotation, achieving adaptive bonding. This protects the surface and internal structure of the cylindrical batteries from damage while ensuring stable and reliable contact between the support rollers, pressure rollers, and folding rollers and the cylindrical batteries, providing a fundamental guarantee for high-quality overmolding and flattening.

[0010] In some embodiments, the first support portion includes a first cylinder, the outer peripheral surface of the first cylinder is a first support surface, the side of the folding portion facing the first cylinder is a folding surface, and the included angle formed by the first support surface and the folding surface is an obtuse angle; the shape of the pressing portion is a circular plate, and the second support portion includes a second cylinder extending along the thickness direction of the circular plate, the outer peripheral surface of the second cylinder is a second support surface, the side of the pressing portion facing the second cylinder is a pressing surface, and the second support surface and the pressing surface are perpendicular to each other.

[0011] By specifically defining the structures of the folding and pressing rollers, the key geometric features for optimizing folding and flattening effects were identified. The obtuse-angled folding surface allows for a gentle pre-folding of the tape, reducing stress concentration and defect rates; the perpendicular pressing surface provides the most effective compaction direction. This structural design directly contributes to high yield and stable coating quality.

[0012] In some embodiments, a first transition surface is provided between the first support surface and the folded adhesive surface, and a second transition surface is provided between the second support surface and the pressing adhesive surface, wherein both the first transition surface and the second transition surface are arc surfaces.

[0013] By providing rounded transition surfaces between the first support surface and the folding surface, and between the second support surface and the pressing surface, the risk of sharp edges potentially damaging the cylindrical battery and tape is effectively reduced. This embodiment can reduce the risk of latent defects caused by jig scratches.

[0014] In some embodiments, the distance between the folded adhesive surface and the end face is defined as A, and the distance between the pressing adhesive surface and the end face is defined as B. Then:

[0015] 0 <A≤3mm,0<B≤3mm。

[0016] By setting reasonable spacing between the folding surface and the end face, and between the pressing surface and the end face, the timing and position of the folding and pressing actions are ensured to be highly accurate, which is beneficial for pressing the tape onto the end face.

[0017] In some embodiments, the drive wheel includes a roller body and an elastic layer wrapped around the periphery of the roller body, the elastic layer being frictionally connected to the periphery.

[0018] By wrapping an elastic layer around the drive roller, the issues of drive reliability and product protection are solved simultaneously. The high coefficient of friction ensures efficient power transmission and reduces the risk of uneven coating caused by asynchronous rotation of cylindrical batteries; while the elastic buffer protects the appearance and structural safety of the cylindrical batteries, which is especially important for cylindrical batteries with surface coatings.

[0019] In some embodiments, the elastic layer includes a plurality of spaced-apart sub-layers arranged at intervals along the central axis of the roller body on the outer periphery of the roller body. In other embodiments, the elastic layer completely covers the outer periphery of the roller body.

[0020] By offering different implementations of the elastic layer, design flexibility is provided. The split sublayer solution is economical and easy to maintain and replace; the overall encapsulation solution provides optimal performance and reliability.

[0021] In some embodiments, the cylindrical battery further includes a bottom surface disposed opposite to the end face, and the overmolding mechanism further includes a support component, the support component including a first pusher and a second pusher, the first pusher abutting against the end face, the second pusher abutting against the bottom surface, and the first pusher, the second pusher, and the cylindrical battery being coaxially disposed.

[0022] By adding coaxially arranged support components, the cylindrical battery is axially positioned from both ends, reducing the risk of axial movement that may occur during rotation. This rigid or flexible axial constraint, combined with the radial support of the cylindrical battery by the folding wheel, support wheel, and pressing wheel, constitutes precise positioning of the cylindrical battery in three-dimensional space, laying a solid foundation for high-precision overmolding processes.

[0023] In some embodiments, both the first pusher and the second pusher are non-metallic pushers. In other embodiments, the side of the first pusher facing the end face is provided with an arc corner, and the side of the second pusher facing the bottom face is provided with an arc corner.

[0024] By employing non-metallic materials and rounded corners, the support components achieve positioning while minimizing the potential risk of damage to the cylindrical battery body. The non-metallic materials reduce the risk of introducing conductive impurities, ensuring battery safety; the rounded corners protect the cylindrical battery's appearance and structure, embodying the design philosophy of a "non-destructive" process.

[0025] In some embodiments, the first pusher is a fixed pusher, the second pusher is a movable pusher, and the support assembly further includes a pusher, the pusher including a push portion and a buffer device connected to the push portion, the buffer device being connected to the second pusher.

[0026] Through the design of "fixed pusher + movable pusher", the support assembly can adaptively accommodate the height tolerance of cylindrical batteries. The buffer device ensures controllable and gentle clamping force, achieving stable axial positioning while reducing the risk of overvoltage damage to the cylindrical batteries. The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it according to the contents of the specification, and to make the above and other objects, features and advantages of this application more apparent, specific embodiments of this application are described below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 is a schematic diagram of the cylindrical battery structure;

[0029] Figure 2 is a schematic diagram of the structure of the encapsulation mechanism for clamping a cylindrical battery according to some embodiments of this application;

[0030] Figure 3 is a schematic diagram of the structure of the folding wheel, support wheel, and pressing wheel supporting the cylindrical battery in some embodiments of the coating mechanism of this application;

[0031] Figure 4 is a three-dimensional structural schematic diagram of the folding wheel of the coating mechanism in some embodiments of this application;

[0032] Figure 5 is a three-dimensional structural schematic diagram of the pressure roller of the coating mechanism in some embodiments of this application;

[0033] Figure 6 is a schematic diagram of the drive wheel structure of the overmolding mechanism in some embodiments of this application;

[0034] Figure 7 is a schematic diagram of the structure of a battery production line body according to some embodiments of this application.

[0035] Explanation of icon numbers:

[0036] 1000, Battery production line body; 2000, Cylindrical battery; 2100, Peripheral surface; 2200, End face; 2300, Bottom surface; 2400, Tab; 3000, Adhesive tape;

[0037] 100. Coating mechanism; 200. Unwinding roller; 300. Adjusting roller; 310. Straightening roller; 320. Glue-pulling roller; 400. Cutter; 500. Glue-pulling gripper; 600. Foam; 700. Glue-pressing plate;

[0038] 1. Support wheel; 2. Drive wheel; 21. Roller body; 22. Elastic layer; 221. Sub-layer; 3. Folding wheel; 31. First support part; 311. First support surface; 32. Folding part; 321. Folding surface; 33. First transition surface; 4. Pressing wheel; 41. Second support part; 411. Second support surface; 42. Pressing part; 421. Pressing surface; 43. Second transition surface; 5. First pusher head; 6. Second pusher head.

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, it should be considered that such a combination does not exist and is not within the scope of protection claimed in this application. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0045] The descriptions of directions such as "up", "down", "front", "back", "left", and "right" in this application are based on the directions shown in the accompanying drawings and are only used to explain the relative positional relationships between the components in the posture shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0046] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0047] However, in the relevant technologies, the encapsulation process for cylindrical batteries is inefficient during the lithium battery manufacturing process.

[0048] After careful study, the applicant discovered that the cylindrical battery casing is negatively charged, while the tabs on the end face of the cylindrical battery are positively charged. Therefore, it is necessary to use tape to wrap the tabs and casing to insulate them. For the end-face tape application process, the traditional mainstream solution is to first apply insulating tape to the end face of the cylindrical battery at a dedicated station; then, the cylindrical battery is transferred to a separate tape-folding station, where a tape-folding head pre-folds the tape edges extending beyond the end face towards the circumference; finally, it is transferred to a flattening station, where a flattening head presses the tape tightly and firmly.

[0049] The applicant found that this step-by-step operation not only requires three independent workstations and corresponding positioning, clamping and driving mechanisms, but also results in a battery production line that is long, complex, occupies a large area, is expensive, and has low production efficiency.

[0050] Based on this, the applicant proposed a solution: a coating mechanism comprising a drive wheel, a folding wheel, and a pressing wheel. The folding wheel includes a first support portion and a folding part connected to the first support portion. The pressing wheel includes a second support portion and a pressing part connected to the second support portion. The drive wheel, the first support portion, and the second support portion cooperate to form an accommodating space. The circumferential surface is disposed within the accommodating space and is respectively frictionally connected to the drive wheel, the first support portion, and the second support portion. The drive wheel is used to drive the cylindrical battery to rotate. The folding and pressing parts are distributed at intervals along the rotation direction of the cylindrical battery and are both located close to the end face. This coating mechanism can perform the tape bonding, folding, and flattening processes in one station, which can shorten the length of the battery production line, reduce the floor space, and improve production efficiency.

[0051] It should be noted that the battery cell can be used to manufacture a battery device, which includes a housing and the battery cell, with the battery cell housed within the housing. The housing provides a cavity for the battery cell and can employ various structures. In some embodiments, the housing may include a cover and a body, with the cover and body overlapping each other, jointly defining a cavity for accommodating the battery cell. The body can be a hollow structure open at one end, and the cover can be a plate-like structure, fitting over the open side of the body to define the cavity; alternatively, both the cover and body can be hollow structures open on one side, with the open side of the cover fitting over the open side of the body. Of course, the housing formed by the cover and body can be of various shapes, such as a cylinder or cuboid. The body includes a base plate and side panels surrounding the base plate. The encapsulation mechanism described in this application is applied to cylindrical batteries.

[0052] In a battery device, there can be multiple battery cells, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these battery cells is housed within a casing. Alternatively, the battery device can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form battery cell modules, which are then connected in series, parallel, or a combination thereof to form a whole and housed within a casing. The battery device may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0053] Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes. The battery cell referred to in this application is primarily a cylindrical battery cell.

[0054] The battery device can be used in electrical equipment, which can be a vehicle. The vehicle 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. The battery device is installed inside the vehicle, and it can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include control units and a motor. The control units are used to control the power supply from the battery device to the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle.

[0055] Referring to Figures 1 to 3, according to one aspect of this application, this application provides a coating mechanism 100 for coating a cylindrical battery 2000. The cylindrical battery 2000 includes a peripheral surface 2100 and an end surface 2200, and an electrode tab 2400 is provided on the end surface 2200. The coating mechanism 100 includes a drive wheel 2, a folding wheel 3, and a pressing wheel 4. The folding wheel 3 includes a first support portion 31 and a folding portion 32 connected to the first support portion 31. The pressing wheel 4 includes a second support portion 41 and a folding portion 32 connected to the first support portion 31. The two support portions 41 are connected to the pressing portion 42. The drive wheel 2, the first support portion 31 and the second support portion 41 cooperate to form a receiving space. The peripheral surface 2100 is disposed in the receiving space and is frictionally connected to the drive wheel 2, the first support portion 31 and the second support portion 41 respectively. The drive wheel 2 drives the cylindrical battery 2000 to rotate by frictional engagement with the peripheral surface 2100. The folding portion 32 and the pressing portion 42 are distributed at intervals along the rotation direction of the cylindrical battery 2000 and are both disposed close to the end face 2200.

[0056] The peripheral surface 2100 refers to the outer peripheral surface of the cylindrical battery 2000, that is, the outer cylindrical side surface. The core of the coating mechanism 100 in this embodiment lies in integrating the three processes of coating, folding, and pressing into one station for simultaneous completion. Coating refers to attaching the adhesive tape 3000 to the peripheral surface 2100 of the cylindrical battery 2000. Since the end face 2200, which has the tabs 2400, also needs to be coated, a small section of adhesive tape 3000 extends beyond the end face 2200 during the coating process. Folding involves pre-bending this extended section of adhesive tape 3000 towards the end face 2200 to prepare for the subsequent pressing step. Pressing involves flattening this bent section of adhesive tape 3000 onto the end face 2200.

[0057] The cylindrical battery 2000 is typically a steel-cased cylinder with a positive electrode tab 2400 on its end face 2200. To reduce the risk of short circuit between the tab 2400 and the casing, insulating tape 3000 is applied to the end face 2200 and the edges are bound. The drive wheel 2 can be driven to rotate by a motor, and the cylindrical battery 2000 rotates around its own axis through friction with the circumferential surface 2100 (i.e., the outer surface of the cylinder). The folding wheel 3 and the pressing wheel 4 are not actively driven components, but are driven wheels that follow the rotation of the cylindrical battery 2000. Each of them includes a cylindrical support portion (i.e., the first support portion 31 and the second support portion 41) for supporting the circumferential surface 2100 of the cylindrical battery 2000, and a structure extending from the support portion and close to the end face 2200 of the cylindrical battery 2000, namely the folding portion 32 and the pressing portion 42.

[0058] In this application, the drive wheel 2, the first support 31 of the folding wheel 3, and the second support 41 of the pressing wheel 4 cooperate spatially to form an approximately cylindrical receiving space, in which the circumferential surface 2100 of the cylindrical battery 2000 is stably supported and held within this space. When the drive wheel 2 drives the cylindrical battery 2000 to rotate, the cut adhesive tape 3000 will be wound around the circumferential surface 2100. When it passes the folding part 32 located at the front, due to the specific angle (such as an obtuse angle) of the folding part 32, the edge of the adhesive tape 3000 extending beyond the end face 2200 is pre-bent, that is, the adhesive tape 3000 extending beyond the end face 2200 is pressed towards the end face 2200. Subsequently, the cylindrical battery 2000 continues to rotate, and the pre-folded tape 3000 passes through the rearward pressing part 42. The pressing part 42 further presses and flattens the tape 3000, making it firmly attached to the end face 2200 of the cylindrical battery 2000. In this way, the functions of wrapping, folding and flattening are completed in one station.

[0059] With the above structure, the cylindrical battery 2000 can continuously complete the coating, folding and flattening processes of the tape 3000 during one rotation driven by the drive wheel 2, realizing integrated coating and flattening operations and improving production efficiency.

[0060] The coating mechanism 100 in this embodiment integrates the coating, folding, and flattening processes, which traditionally require multiple independent workstations, into a single workstation for simultaneous completion. Utilizing the rotation of the cylindrical battery 2000 as a power source, the folding and pressing actions are completed by fixedly positioned folding wheels 3 and pressing wheels 4. This simplifies the structure of the battery production line 1000, reduces equipment costs and floor space, shortens production cycle time, and improves production efficiency. Simultaneously, because the folding and flattening actions are performed synchronously with the rotation of the cylindrical battery 2000, the requirements for the diameter and roundness tolerances of the cylindrical battery 2000 are reduced, and extremely demanding fixtures and battery concentricity are eliminated, effectively improving production yield and efficiency.

[0061] Referring to Figure 2 or Figure 3, in some embodiments, the overmolding mechanism 100 further includes a support wheel 1. The first support portion 31 and the second support portion 41 are both disposed on the side of the peripheral surface 2100 near the end face 2200, and the support wheel 1 is disposed on the side of the peripheral surface 2100 away from the end face 2200. The support wheel 1, the first support portion 31 and the second support portion 41 support the peripheral surface 2100 at the same horizontal height.

[0062] In this embodiment, the coating mechanism 100 is equipped with a support wheel 1. This support wheel 1 is located on the circumferential surface 2100 of the cylindrical battery 2000, away from the adhesive-coating end face 2200, i.e., at the bottom or middle of the cylindrical battery 2000. The first support portion 31 of the folding wheel 3 and the second support portion 41 of the pressing wheel 4 are located on the circumferential surface 2100 of the cylindrical battery 2000, closer to the end face 2200.

[0063] The support surfaces (i.e., the cylindrical surfaces in contact with the cylindrical battery 2000) of the support wheel 1, the first support part 31, and the second support part 41 are at the same horizontal level, forming a more stable triangular or multi-point support structure that firmly supports the circumferential surface 2100 of the cylindrical battery 2000. This arrangement ensures that during rotation, the area near the end face 2200 of the cylindrical battery 2000 is supported by the first support part 31 and the second support part 41, while the area away from the end face 2200 is supported by the support wheel 1. In other words, the circumferential surface 2100 is supported from both ends of the cylindrical battery 2000 along the central axis, effectively supporting all positions of the cylindrical battery 2000. This reduces the risk of the cylindrical battery 2000 tilting or wobbling due to uneven force or gravity, and improves the stability and precision of the folding and flattening process.

[0064] It should be noted that the support wheel 1 can be cylindrical or flat. The circumferential surface 2100 of the support wheel 1 is a cylindrical surface. It can also drive the support wheel 1 to rotate together under the rotation of the cylindrical battery 2000. The number of support wheels 1 can be one, two or more, as shown in Figures 2 and 3, where there are two. The two support wheels 1 are set at intervals. This application does not make a specific limitation on the number of support wheels 1.

[0065] By adding a support wheel 1, which works in conjunction with the first support part 31 of the folding wheel 3 and the second support part 41 of the pressing wheel 4, a more complete and stable multi-point support system for the cylindrical battery 2000 is formed. This effectively reduces the risk of positional shift or vibration of the cylindrical battery 2000 when rotating at high speed or under force, and ensures that the distance between the folding part 32 and the pressing part 42 and the end face 2200 of the cylindrical battery 2000 remains constant. This ensures the stability and consistency of the folding angle and flattening effect, further improving the coating quality and yield.

[0066] Referring to Figure 2 or Figure 3, in some embodiments, the cylindrical battery 2000 further includes a bottom surface 2300 disposed opposite to the end surface 2200, and the overmolding mechanism 100 further includes a support assembly, which includes a first push head 5 and a second push head 6. The first push head 5 abuts against the end surface 2200, and the second push head 6 abuts against the bottom surface 2300. The first push head 5, the second push head 6, and the cylindrical battery 2000 are coaxially disposed.

[0067] In this embodiment, an independent support component is added to the coating mechanism 100 to axially position and support the cylindrical battery 2000 during the coating process, thereby reducing the risk of axial movement.

[0068] The support assembly mainly consists of two pushers: a first pusher 5 and a second pusher 6. The cylindrical battery 2000 has opposing end faces 2200 and bottom faces 2300: the end face 2200, which has tabs 2400 and is the face to be coated, is the opposite end face 2300. The first pusher 5 abuts against the central area of ​​the end face 2200, and the second pusher 6 abuts against the central area of ​​the bottom face 2300.

[0069] The first pusher 5, the second pusher 6, and the cylindrical battery 2000 are configured to be coaxial, meaning their central axes coincide or are parallel. The first pusher 5 and the second pusher 6 axially clamp or support the cylindrical battery 2000 from both ends, restricting the cylindrical battery 2000's degrees of freedom in the axial direction. When the drive wheel 2 rotates the cylindrical battery 2000, this axial positioning ensures that the cylindrical battery 2000 will not move axially, thus guaranteeing a constant relative position between the folding wheel 3 and the pressing wheel 4 and the end face 2200 of the cylindrical battery 2000. This is a prerequisite for obtaining stable coating quality. It should also be noted that the diameter of the first push head 5 that contacts the end face 2200 should be smaller than the diameter of the end face 2200. The first push head 5 can be set concentrically with the end face 2200, and there needs to be a gap between the outer edge of the first push head 5 and the outer edge of the end face 2200. This design is to reduce the risk that the tape 3000 will stick to the first push head 5 because the distance between the first push head 5 and the edge of the end face 2200 is too small during the folding and pressing process.

[0070] By adding a support assembly coaxially arranged with the cylindrical battery 2000, axial positioning is achieved from both ends of the cylindrical battery 2000, reducing the risk of axial movement that may occur during rotation. This rigid or flexible axial constraint, combined with the radial support of the cylindrical battery 2000 provided by the folding wheel 3, support wheel 1, and pressing wheel 4, constitutes a precise positioning of the cylindrical battery 2000 in three-dimensional space, laying a solid foundation for high-precision overmolding processes.

[0071] In some embodiments, the first pusher head 5 and the second pusher head 6 are both non-metallic pushers; in other embodiments, the side of the first pusher head 5 facing the end face 2200 is provided with an arc corner, and the side of the second pusher head 6 facing the bottom face 2300 is provided with an arc corner.

[0072] This embodiment features an optimized design for the pusher head of the support component, involving material selection and structural details. Specifically:

[0073] In terms of structural optimization, in some embodiments, the first pusher head 5 and the second pusher head 6 are preferably made of non-metallic materials, such as PTFE (polytetrafluoroethylene), PET (polyethylene terephthalate), PP (polypropylene), PC (polycarbonate), POM (polyoxymethylene), PEEK (polyetheretherketone), and other wear-resistant, insulating, and low-friction engineering plastics. Using non-metallic materials can reduce the risk of metal shavings being generated due to friction between the metal pusher head and the end face 2200 of the cylindrical battery 2000 (usually made of aluminum or steel). If these tiny metal shavings fall into the interior of the cylindrical battery 2000 or between the tabs 2400, they may cause serious safety hazards such as short circuits. At the same time, it can also reduce the risk of conductivity when in contact with the tabs 2400.

[0074] In terms of structural details, in some embodiments, rounded corners, or chamfered corners, are provided at the end edges where the first pusher 5 contacts the end face 2200 of the cylindrical battery 2000, and the second pusher 6 contacts the bottom surface 2300 of the cylindrical battery 2000. Sharp right-angled edges, when contacting the cylindrical battery 2000, can easily cause indentations or even damage to the center or edge of the end face 2200. The rounded corner design makes the contact smoother, transforming possible point or line contact into small-area surface contact, dispersing contact pressure, and effectively protecting the integrity of the end face 2200 and bottom surface 2300 of the cylindrical battery 2000.

[0075] By employing non-metallic materials and rounded corners, the support components achieve positioning while minimizing the potential risk of damage to the cylindrical battery 2000 itself. The non-metallic materials reduce the risk of introducing conductive impurities, ensuring battery safety; the rounded corners protect the appearance and structure of the cylindrical battery 2000.

[0076] In some embodiments, the first pusher 5 is a fixed pusher, the second pusher 6 is a movable pusher, and the support assembly further includes a pusher, which includes a push portion and a buffer device connected to the push portion, and the buffer device is connected to the second pusher 6.

[0077] This embodiment further refines the working principle of the support component, designing it as a flexible clamping structure that is stationary yet movable. Specifically:

[0078] The first pusher head 5 is set as a fixed pusher head, and its position remains unchanged after the equipment is debugged, serving as the reference surface for axial positioning of the cylindrical battery 2000. The second pusher head 6 is set as a movable pusher head, that is, the second pusher head 6 can move along the central axis of the cylindrical battery 2000.

[0079] The second pusher head 6 is driven by a set of pushers, which includes a pusher and a buffer device. The pusher can be a cylinder, a servo motor, etc., and the buffer device can be a spring, a flexible coupling, or an air cushion built into the cylinder. The pusher provides driving force to move the second pusher head 6 toward the bottom surface 2300 of the cylindrical battery 2000, and the buffer device is connected in series between the pusher and the second pusher head 6.

[0080] The specific workflow of the support assembly is as follows: After the cylindrical battery 2000 is loaded into the working position, the fixed pusher (first pusher 5) is pre-positioned. Then, the pushing unit actuates, driving the second pusher 6 forward toward the bottom surface 2300. When the second pusher 6 contacts the bottom surface 2300 of the cylindrical battery 2000 and continues to move forward, the buffer device begins to compress, thereby providing a flexible and buffered clamping force to gently hold the cylindrical battery 2000 between the first pusher 5 and the second pusher 6. The buffer device can accommodate minor manufacturing tolerances in the height of different cylindrical batteries 2000, where the height direction is the direction of the central axis of the cylindrical battery 2000, ensuring effective clamping without damaging the cylindrical battery 2000 due to excessive rigid force, and accommodating certain manufacturing tolerances.

[0081] Through the design of "fixed pusher + movable pusher", the support assembly can adaptively accommodate the height tolerance of the cylindrical battery 2000. The buffer device ensures that the clamping force is controllable and gentle, achieving stable axial positioning while reducing the risk of overpressure damage to the cylindrical battery 2000.

[0082] In some embodiments, the overmolding mechanism 100 further includes a plurality of drive components, each drive component including a drive member and a buffer structure connected to the output shaft of the drive member, and the support wheel 1, the pressure wheel 4 and the folding wheel 3 are each connected to a buffer structure.

[0083] In this embodiment, independent drive components are configured for the support wheel 1, the pressure wheel 4, and the folding wheel 3. Each drive component includes a drive element and a buffer structure. The drive element can be any one of a cylinder, an electric cylinder, or a linear motor, and the buffer structure can be any one of a spring, an air bladder, or an elastomer.

[0084] The driving component provides driving force to move the corresponding wheels (including support wheel 1, pressure wheel 4, and folding wheel 3) along a preset direction, which is usually perpendicular to the axis of the cylindrical battery 2000, to achieve a lifting action on the cylindrical battery 2000. A buffer structure is connected in series between the output shaft of the driving component and the wheels. Its function is to provide a certain elastic deformation space when the wheels contact the cylindrical battery 2000 and apply support or pressure. When the cylindrical battery 2000 has minor tolerances in diameter or roundness, or when the cylindrical battery 2000 experiences slight vibration during rotation, the buffer structure can absorb these deviations through its own compression or elongation, reducing the risk of scratches on the circumferential surface 2100 of the cylindrical battery 2000 caused by rigid impacts, or overload damage to the wheels and driving component.

[0085] For example, during initial loading, the three drive components operate simultaneously, driving the support wheel 1, the pressure wheel 4, and the folding wheel 3 to move, and simultaneously driving the cylindrical battery 2000 towards the drive wheel 2 until the drive wheel 2 contacts the circumferential surface 2100 of the cylindrical battery 2000. The buffer structure ensures that the contact force is flexible and adjustable. Alternatively, the cylindrical battery 2000 can be fixed first, and then the three drive components operate simultaneously, driving the support wheel 1, the pressure wheel 4, and the folding wheel 3 towards the cylindrical battery 2000 until they contact the circumferential surface 2100 of the cylindrical battery 2000.

[0086] By configuring drive components with buffer structures for the support wheel 1, pressure wheel 4, and folding wheel 3, flexible clamping and support of the cylindrical battery 2000 are achieved. The buffer structure effectively accommodates the manufacturing tolerances of the cylindrical battery 2000 in terms of diameter and roundness, as well as dynamic movement during rotation, achieving adaptive bonding. This protects the surface and internal structure of the cylindrical battery 2000 from damage and ensures stable and reliable contact between the support wheel 1, pressure wheel 4, and folding wheel 3 and the cylindrical battery 2000, providing a fundamental guarantee for high-quality overmolding and flattening.

[0087] In some embodiments, referring to FIG4, the first support portion 31 includes a first cylinder, the outer peripheral surface of the first cylinder is the first support surface 311, and the side of the folding portion 32 facing the first cylinder is the folding surface 321. The included angle formed by the first support surface 311 and the folding surface 321 is an obtuse angle. Referring to FIG5, the shape of the pressing portion 42 is a circular plate, and the second support portion 41 includes a second cylinder extending along the thickness direction of the circular plate. The outer peripheral surface of the second cylinder is the second support surface 411, and the side of the pressing portion 42 facing the second cylinder is the pressing surface 421. The second support surface 411 and the pressing surface 421 are perpendicular to each other.

[0088] This embodiment specifically defines the key structural shapes of the folding roller 3 and the pressing roller 4, which are described below:

[0089] For the folding roller 3, its first support portion 31 is a cylindrical first cylinder, the cylindrical surface of which is the first support surface 311, used to contact the circumferential surface 2100 of the cylindrical battery 2000. The folding portion 32 is a structure extending from the end of the first cylinder, roughly in the shape of a circular plate, and its side facing the inner side of the first cylinder is the folding surface 321. An obtuse angle is formed between the first support surface 311 and the folding surface 321, as shown by α in Figure 4. An obtuse angle is an angle greater than 90 degrees. In some specific embodiments, the angle value can be in the range of 100 degrees to 170 degrees. The obtuse angle design is crucial. When the cylindrical battery 2000 rotates and causes the edge of the tape 3000 to contact the folding surface 321, the obtuse angle provides a gentle transition slope, which gradually and smoothly bends the edge of the tape 3000, which was originally perpendicular to the end face 2200, toward the end face 2200 to complete the pre-fold, reducing the risk of the tape 3000 wrinkling, tearing, or not sticking properly if a right-angle bend is used directly.

[0090] For the pressure roller 4, its pressure part 42 is a circular plate structure, similar to a flange. The side facing the end face 2200 of the cylindrical battery 2000 is the pressure surface 421, typically a flat annular plane. The second support part 41 is a cylindrical second cylinder extending from the back of the pressure part 42 along its thickness direction; its cylindrical surface is the second support surface 411, used to contact the circumferential surface 2100 of the cylindrical battery 2000. The second support surface 411 and the pressure surface 421 are perpendicular or approximately perpendicular to each other, between 80 and 100 degrees. When the pre-folded tape 3000 rotates with the cylindrical battery 2000 to the pressure surface 421, the perpendicular or approximately perpendicular pressure surface 421 applies a pressure perpendicular to the circumferential surface 2100 of the cylindrical battery 2000 to the bent tape 3000, firmly pressing and flattening the tape 3000 onto the end face 2200, improving the reliability of insulation and fixation.

[0091] By specifically defining the structures of the folding roller 3 and the pressing roller 4, the key geometric features for achieving optimized folding and flattening effects were clarified. The obtuse-angled folding surface 321 enables a gentle pre-folding of the tape 3000, reducing stress concentration and defect rate; the vertical pressing surface 421 provides the most effective compaction direction. This structural design directly contributes to high yield and stable coating quality.

[0092] Referring to Figures 4 and 5, in some embodiments, a first transition surface 33 is provided between the first support surface 311 and the folding adhesive surface 321, and a second transition surface 43 is provided between the second support surface 411 and the pressing adhesive surface 421. Both the first transition surface 33 and the second transition surface 43 are arc surfaces.

[0093] This embodiment further optimizes the detailed structure of the folding roller 3 and the pressing roller 4 based on the previous embodiment. Specifically:

[0094] On the folding roller 3, the first support surface 311 (cylindrical surface) and the folding surface 321 (sloping surface) do not intersect directly at their edges. Instead, a first transition surface 33 is provided at the intersection. This transition surface is an arc surface, which is a typical rounded corner. Similarly, on the pressing roller 4, a second transition surface 43 is also provided between the cylindrical surface of the second support surface 411 and the pressing surface 421. This second transition surface 43 is also an arc surface.

[0095] In this embodiment, the main purpose of providing a rounded transition surface is to eliminate sharp edges. During the contact and relative movement between the wheel (referring to the folding wheel 3 or pressing wheel 4) and the cylindrical battery 2000 and the tape 3000, sharp edges can easily scratch the coating or insulating film on the surface of the cylindrical battery 2000, and may also scratch or cut the soft tape 3000. The rounded transition surface makes the contact position smoother, guiding the tape 3000 and the surface of the cylindrical battery 2000 smoothly through the junction of the two surfaces, which not only provides protection, but also makes the deformation process of the tape 3000 smoother and more natural, further improving process stability and product appearance quality.

[0096] By providing a first transition surface 33 between the first support surface 311 and the folding surface 321, and a second transition surface 43 between the second support surface 411 and the pressing surface 421, the risk of sharp edges potentially damaging the cylindrical battery 2000 and the tape 3000 is effectively reduced. This embodiment can reduce the risk of latent defects caused by jig scratches.

[0097] In some embodiments, the interval between the folded adhesive surface 321 and the end face 2200 is defined as A, and the interval between the pressing adhesive surface 421 and the end face 2200 is defined as B. Then: 0 <A≤3mm,0<B≤3mm。

[0098] For the folding surface 321, maintaining a relatively close distance to the end face 2200 ensures that the tape 3000 is captured and guided to bend when it just extends out of the end face 2200 and is not yet completely free to hang, resulting in a precise folding position and clear crease. If the distance is too large, the tape 3000 will sag, resulting in an uncertain folding position and poor shape.

[0099] For the adhesive-pressing surface 421, maintaining a close distance to the end face 2200 ensures that the pressing force acts directly on the newly bent tape 3000, immediately pressing it firmly onto the end face 2200 and reducing the risk of springback. Simultaneously, this distance also reduces the risk of interference between the adhesive-pressing surface 421 and the tabs 2400 or other protruding structures on the end face 2200 of the cylindrical battery 2000.

[0100] This embodiment precisely defines the working positions of the folding roller 3 and the pressing roller 4. Specifically, the distance between the folding surface 321 and the end face 2200 of the cylindrical battery 2000, and the distance between the pressing surface 421 and the end face 2200 of the cylindrical battery 2000, are both controlled within the range of 0 to 3 millimeters. Generally, excluding 0 millimeters, the distance can be any value among 0.1mm, 0.5mm, 1mm, 2mm, 2.5mm, or 3mm. Those skilled in the art can set the distance according to actual needs. Designing the corresponding distance intervals ensures the smooth progress of folding and pressing, which is beneficial to the folding and pressing process. This distance range is an optimal working distance verified in practice.

[0101] By setting reasonable spacing between the folding surface 321 and the end face 2200, and between the pressing surface 421 and the end face 2200, the timing and position of the folding and pressing actions are ensured to be highly accurate, which is beneficial for pressing the tape 3000 onto the end face 2200.

[0102] Referring to FIG6, in some embodiments, the drive wheel 2 includes a roller body 21 and an elastic layer 22 wrapped around the outer periphery of the roller body 21, the elastic layer 22 being frictionally connected to the peripheral surface 2100.

[0103] This embodiment describes the structure of the drive wheel 2 in detail. The core of the drive wheel 2 is a roller 21 made of metal or rigid plastic, which provides structural strength and is used for connection to the drive motor. An elastic layer 22 is tightly wrapped around the outer periphery of the roller 21.

[0104] The elastic layer 22 can be made of rubber, polyurethane, silicone, or other polymeric materials with a high coefficient of friction and good elasticity. Its main functions are twofold: first, to provide sufficient friction, ensuring that the cylindrical battery 2000 can rotate synchronously when the drive wheel 2 rotates through the close contact and elastic deformation of the cylindrical battery 2000's circumferential surface 2100, thus reducing the risk of slippage; second, to provide cushioning protection, as the soft properties of the elastic material reduce the risk of scratches or indentations caused by direct contact between the hard roller 21 and the cylindrical battery 2000's surface, while also adapting to minor unevenness on the cylindrical battery 2000's surface.

[0105] By wrapping an elastic layer 22 around the roller 21 of the drive wheel 2, the issues of drive reliability and product protection are solved simultaneously. The high-friction coefficient elastic layer 22 ensures efficient power transmission and reduces the risk of uneven coating caused by asynchronous rotation of the cylindrical battery 2000; while the elastic cushioning protects the appearance and structural safety of the cylindrical battery 2000, which is particularly important for cylindrical batteries 2000 with surface coatings.

[0106] Referring to FIG6, in some embodiments, the elastic layer 22 includes a plurality of sub-layers 221 spaced apart, the plurality of sub-layers 221 being arranged at intervals along the central axis of the roller body 21 on the outer periphery of the roller body 21. In other embodiments, the elastic layer 22 completely covers the outer periphery of the roller body 21.

[0107] This embodiment provides two specific embodiments of the elastic layer 22 of the drive wheel 2.

[0108] Referring to Figure 6, the first embodiment is a split elastic layer 22. In this embodiment, the elastic layer 22 is not a complete cylinder, but is composed of multiple independent sub-layers 221, each of which is annular in shape. These sub-layers 221 are arranged at intervals along the central axis of the roller body 21 on the outer circumferential surface of the roller body 21. Gaps are left between adjacent sub-layers 221. This design can reduce the amount of elastic material used, reduce costs, and the presence of gaps may help dissipate heat or expel any foreign objects that may be trapped. Each sub-layer 221 contacts the cylindrical battery 2000 independently, so even if one sub-layer 221 is partially worn, it does not affect the frictional performance of other sub-layers 221.

[0109] The second embodiment is an integral elastic layer 22: the elastic layer 22 is a complete sleeve or a continuous layer formed by an overmolding process, which can completely cover the entire outer circumferential surface of the roller 21. This method can provide a larger and more uniform frictional contact area, better driving stability, and more comprehensive protection for the cylindrical battery 2000. In actual production, those skilled in the art can select the most suitable elastic layer 22 design scheme according to the specific cylindrical battery 2000 specifications, speed requirements, cost budget, and other factors.

[0110] By providing different implementations of the elastic layer 22, design flexibility is given. The split sublayer 221 solution is economical and easy to maintain and replace; the overall encapsulation solution provides superior performance and reliability.

[0111] According to some embodiments of this application, this application provides a coating structure for coating a cylindrical battery 2000. The cylindrical battery 2000 includes a peripheral surface 2100 and end surfaces 2200 and a bottom surface 2300 respectively disposed at both ends of the peripheral surface 2100. A tab 2400 is disposed on the end surface 2200. The coating mechanism 100 includes a support assembly, a drive wheel 2, a support wheel 1, a folding wheel 3, and a pressing wheel 4. The folding wheel 3 includes a first support portion 31 and a folding portion 32 connected to the first support portion 31. The pressing wheel 4 includes a second support portion 41 and a pressing portion 42 connected to the second support portion 41. The drive wheel 2, the first support portion 31, and the pressing wheel 4 are also included. The second support portion 41 cooperates to form an accommodating space. The first support portion 31 and the second support portion 41 are disposed on the side of the peripheral surface 2100 near the end face 2200. The support wheel 1 is disposed on the side of the peripheral surface 2100 away from the end face 2200. The support wheel 1, the first support portion 31 and the second support portion 41 support the peripheral surface 2100 at the same horizontal height. The peripheral surface 2100 is frictionally connected to the drive wheel 2, the first support portion 31 and the second support portion 41, respectively. The drive wheel 2 is used to drive the cylindrical battery 2000 to rotate. The folding part 32 and the pressing part 42 are distributed at intervals along the rotation direction of the cylindrical battery 2000 and are both disposed near the end face 2200. The drive wheel 2 includes a roller body 21 and an elastic layer 22 wrapped around the outer periphery of the roller body 21. The elastic layer 22 is frictionally connected to the peripheral surface 2100. The elastic layer 22 includes a plurality of sub-layers 221 spaced apart, which are arranged at intervals along the central axis of the roller body 21 on the outer periphery of the roller body 21; or, the elastic layer 22 completely covers the outer periphery of the roller body 21. The support assembly includes a first pusher 5 and a second pusher 6. The first pusher 5 abuts against the end face 2200, and the second pusher 6 abuts against the bottom face 2300. The first pusher 5, the second pusher 6, and the cylindrical battery 2000 are coaxially arranged. Both the first pusher 5 and the second pusher 6 are non-metallic pushers. The side of the first pusher 5 facing the end face 2200 has a rounded corner, and the side of the second pusher 6 facing the bottom face 2300 has a rounded corner. The first pusher 5 is a fixed pusher, and the second pusher 6 is a movable pusher. The support assembly also includes a pushing member, which includes a pushing part and a buffer device connected to the pushing part. The buffer device is connected to the second pusher 6.

[0112] In some specific embodiments, the first support portion 31 includes a first cylinder, the outer peripheral surface of the first cylinder is the first support surface 311, the side of the folding portion 32 facing the first cylinder is the folding surface 321, and the included angle formed by the first support surface 311 and the folding surface 321 is an obtuse angle; the shape of the pressing portion 42 is a circular plate, and the second support portion 41 includes a second cylinder extending along the thickness direction of the pressing portion 42, the outer peripheral surface of the second cylinder is the second support surface 411, the side of the pressing portion 42 facing the second cylinder is the pressing surface 421, and the second support surface 411 and the pressing surface 421 are perpendicular to each other. Furthermore, a first transition surface 33 is provided between the first support surface 311 and the folding surface 321, and a second transition surface 43 is provided between the second support surface 411 and the pressing surface 421. Both the first transition surface 33 and the second transition surface 43 are arc surfaces. The interval between the folding surface 321 and the end face 2200 is 0~3mm, and the interval between the pressing surface 421 and the end face 2200 is 0~3mm.

[0113] Referring to FIG7, according to another aspect of this application, this application also provides a battery production line body 1000, which includes an unwinding roller 200, an adjusting roller 300, a cutter 400, a coating mechanism 100, and a coating gripper 500 arranged along the transport direction of the conveyor belt 3000. The coating mechanism 100 is the coating mechanism 100 described above.

[0114] This embodiment will be described in the context of a battery production line body 1000 (specifically, the rubber-coating section).

[0115] The coating section of the battery production line body 1000 is a continuous automated system. The material (insulating tape 3000) flows sequentially through the following modules: unwinding roller 200, adjusting roller 300, cutter 400, coating mechanism 100, and tape-pulling gripper 500. The unwinding roller 200 carries and unwinds the tape 3000 roll. The adjusting roller 300 may include one or more of a correction roller 310, a tape-pulling roller 320, a tension roller, and a guide roller, used to control the tension and straightness of the tape 3000. The cutter 400 cuts the tape 3000 to a predetermined length. The tape-pulling gripper 500 clamps the head of the tape 3000 and pulls it to a predetermined position, maintaining the tape 3000 in a straight state. Additionally, a pressure plate 700 can be installed before the cutter 400, through which the tape 3000 passes, keeping the tape 3000 flat.

[0116] The workflow of the battery production line body 1000 is as follows: The adhesive gripper 500 pulls a certain length of adhesive tape 3000 from the unwinding roller 200, which is then cut by the cutter 400. During the rotation of the cylindrical battery 2000, the cut adhesive tape 3000 is adhered to the circumferential surface 2100 of the cylindrical battery 2000, with a portion of the tape 3000 extending beyond the end face 2200. As the cylindrical battery 2000 continues to rotate, the extended tape 3000 first passes through the folding roller 3 to complete the folding process, and then passes through the pressing roller 4 to complete the wrapping process. After completion, the wrapping mechanism 100 resets, and the cylindrical battery 2000 is transferred to the next workstation.

[0117] By integrating the integrated overmolding mechanism 100 of this application into the battery production line body 1000, the traditional multiple independent overmolding, folding, and flattening stations are replaced. This greatly simplifies the production line layout, reduces the equipment footprint and the number of mechanisms, and improves the overall production cycle and coordination, making it a key module for achieving efficient and compact battery production.

[0118] In some embodiments, the cutter 400 is provided with foam 600, which is used to adhere the tape 3000 cut by the cutter 400 to the peripheral surface 2100.

[0119] A piece of foam 600, a sponge-like porous elastic material, is attached to the blade of the cutter 400 or the pressure plate near it. When the cutter 400 moves downward to complete the cutting action, the foam 600 moves with the cutter 400, adhering the ends of the cut tape segments 3000 to the peripheral surface 2100.

[0120] Subsequently, as the cylindrical battery 2000 rotates, as shown in Figure 7 (clockwise rotation), the cut adhesive tape 3000 is gradually applied to different positions on the circumference 2100 of the cylindrical battery 2000, covering the entire circumference 2100. The extended adhesive tape 3000 then passes through the folding roller 3 and the pressing roller 4 in sequence, completing the wrapping process. Because the foam 600 is elastic, it provides cushioning, ensuring that the adhesive tape 3000 adheres to the circumference 2100, reducing the occurrence of air bubbles or incomplete adhesion. After application, the cutter 400 retracts, and the foam 600 separates from the adhesive tape 3000.

[0121] By setting foam 600 on the cutter 400, the end of the tape 3000 can be adhered to the circumferential surface 2100 of the cylindrical battery 2000 during the cutting process, which is beneficial for subsequently adhering the cut tape 3000 to the circumferential surface 2100 of the rotating cylindrical battery 2000.

[0122] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A coating mechanism for coating a cylindrical battery, the cylindrical battery comprising a peripheral surface and an end surface, wherein tabs are provided on the end surface, characterized in that, The coating mechanism includes a drive wheel, a folding wheel, and a pressing wheel. The folding wheel includes a first support portion and a folding part connected to the first support portion. The pressing wheel includes a second support portion and a pressing part connected to the second support portion. The drive wheel, the first support portion, and the second support portion cooperate to form an accommodating space. The drive wheel drives the cylindrical battery to rotate by frictional engagement with the circumferential surface. The folding part and the pressing part are distributed at intervals along the rotation direction of the cylindrical battery and are both located close to the end face.

2. The coating mechanism according to claim 1, characterized in that, The coating mechanism further includes a support wheel. The first support portion and the second support portion are both disposed on the side of the peripheral surface close to the end face, and the support wheel is disposed on the side of the peripheral surface away from the end face. The support wheel, the first support portion, and the second support portion support the peripheral surface at the same horizontal height.

3. The coating mechanism according to claim 2, characterized in that, The coating mechanism further includes multiple drive components, each drive component including a drive element and a buffer structure connected to the output shaft of the drive element, and the support wheel, the pressing wheel and the folding wheel are each connected to one of the buffer structures.

4. The coating mechanism according to claim 1, characterized in that, The first support portion includes a first cylinder, the outer peripheral surface of the first cylinder is a first support surface, the side of the folding portion facing the first cylinder is a folding surface, and the included angle formed by the first support surface and the folding surface is an obtuse angle; the pressing portion is in the shape of a circular plate, and the second support portion includes a second cylinder extending along the thickness direction of the pressing portion, the outer peripheral surface of the second cylinder is a second support surface, the side of the pressing portion facing the second cylinder is a pressing surface, and the second support surface and the pressing surface are perpendicular to each other.

5. The coating mechanism according to claim 4, characterized in that, A first transition surface is provided between the first supporting surface and the folded adhesive surface, and a second transition surface is provided between the second supporting surface and the pressing adhesive surface. Both the first transition surface and the second transition surface are arc surfaces.

6. The coating mechanism according to claim 4, characterized in that, Let A be the distance between the folded adhesive surface and the end face, and B be the distance between the pressing adhesive surface and the end face. Then: 0 <A≤3mm,0<B≤3mm。 7. The coating mechanism according to any one of claims 1 to 6, characterized in that, The drive wheel includes a roller body and an elastic layer wrapped around the outer periphery of the roller body, the elastic layer being frictionally connected to the periphery.

8. The coating mechanism according to claim 7, characterized in that, The elastic layer includes a plurality of sub-layers spaced apart, the plurality of sub-layers being arranged at intervals along the axial direction of the roller body on the outer periphery of the roller body; or, the elastic layer completely covers the outer periphery of the roller body.

9. The coating mechanism according to any one of claims 1 to 6, characterized in that, The cylindrical battery also includes a bottom surface disposed opposite to the end face, and the encapsulation mechanism also includes a support component, the support component including a first pusher and a second pusher, the first pusher abutting against the end face, the second pusher abutting against the bottom surface, and the first pusher, the second pusher, and the cylindrical battery being coaxially disposed.

10. The coating mechanism according to claim 9, characterized in that, Both the first pusher and the second pusher are non-metallic pushers; and / or, the side of the first pusher facing the end face is provided with an arc corner, and the side of the second pusher facing the bottom face is provided with an arc corner.

11. The coating mechanism according to claim 9, characterized in that, The first pusher is a fixed pusher, the second pusher is a movable pusher, and the support assembly further includes a pushing member, which includes a pushing part and a buffer device connected to the pushing part. The buffer device is connected to the second pusher.

12. A battery production line body, characterized in that, The battery production line body includes an unwinding roller, an adjusting roller, a cutter, the coating mechanism, and a coating gripper arranged along the conveyor belt direction, wherein the coating mechanism is the coating mechanism according to any one of claims 1 to 11.

13. The battery production line body according to claim 12, characterized in that, The cutter is provided with foam, which is used to adhere the tape cut by the cutter to the peripheral surface.

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