Pole piece single winding mechanism, battery cell winding device and battery processing equipment

Abstract

The utility model discloses a kind of pole piece single winding mechanism, battery cell winding device and battery processing equipment, pole piece single winding mechanism includes pedestal, winding needle and pressure assembly, winding needle is rotatably arranged in the pedestal, for winding pole piece;The pressure assembly includes fixing piece, swing arm and press roll, the fixing piece is installed in the pedestal, and located in one side of the winding needle, one end of the swing arm is rotatably connected with the fixing piece, and the other end is rotatably connected with the press roll, the axial direction of the press roll is same with the axial direction of the winding needle, to resist the pole piece on the winding needle;Two bearings are arranged at the rotatable connection of the two ends of the press roll and the swing arm, and at least one bearing is provided with a dustproof piece on the side facing the outside. The pole piece single winding mechanism of the utility model technical scheme can improve the opening rate, improve the processing efficiency and save the cost.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, and in particular to an electrode single-winding mechanism, a cell winding device, and battery processing equipment. Background Technology

[0002] Lithium-ion battery wound cells are manufactured using winding equipment. The winding equipment overlaps, winds, and applies a stop adhesive to the positive and negative electrode sheets and the separator in a specific order to form a wound cell. Usually, problems may occur with the positive or negative electrode materials during the winding process. In order to save costs and avoid wasting separator material, a single-winding mechanism is usually set up to wind the damaged electrode sheets individually.

[0003] However, the existing single-roll mechanism has an unreasonable structural design, a high failure rate, and downtime affects production efficiency; if it is not shut down, the single-roll mechanism will have a low utilization rate, and since the cost of the diaphragm accounts for a high proportion of the cost of the battery cell, it will greatly affect cost control. Utility Model Content

[0004] The main purpose of this utility model is to provide a single-winding electrode mechanism, which aims to reduce its failure rate, increase its opening rate, and save costs.

[0005] To achieve the above objectives, the electrode single-winding mechanism proposed in this utility model includes:

[0006] Base;

[0007] A winding needle, rotatably mounted on the base, is used for winding the electrode sheet; and

[0008] A pressing assembly includes a fixing member, a swing arm, and a pressure roller. The fixing member is installed on the base and located on one side of the winding needle. One end of the swing arm is rotatably connected to the fixing member, and the other end is rotatably connected to the pressure roller. The axial direction of the pressure roller is the same as the axial direction of the winding needle to press against the electrode sheet on the winding needle.

[0009] Two bearings are provided at the rotatable connection points between the two ends of the pressure roller and the swing arm, and at least one of the bearings is provided with a dustproof component on its outward-facing side.

[0010] This invention relates to a single-winding electrode mechanism. The winding needle rotates to wind defective electrodes that need to be recycled. The swing arm of the clamping component is rotatable relative to the fixed part, thereby driving the pressure roller to rotate and press against the surface of the electrode, thus clamping the wound electrode and preventing it from loosening. A bearing is provided between the pressure roller and the swing arm, making the pressure roller rotate more smoothly and reducing wear between them. At least one bearing has a dustproof component on its outward-facing side, i.e., the side away from the inside of the pressure roller. This dustproof component effectively seals the bearing, preventing dust or falling debris from entering during the winding process, effectively reducing bearing jamming and failure. This allows the pressure roller to continuously and stably clamp the electrode, reducing the failure rate of the single-winding electrode mechanism, thereby improving its opening rate, increasing production efficiency, reducing separator waste, and saving battery processing costs.

[0011] In one embodiment of this utility model, the dustproof component is a dustproof cover, and the bearing is a needle roller bearing or a deep groove ball bearing.

[0012] In this embodiment, selecting a needle roller bearing with a dust cover or a deep groove ball bearing with a dust cover can increase the bearing speed, provide better heat dissipation, and facilitate installation and maintenance.

[0013] In one embodiment of the present invention, the pressing assembly further includes an elastic element, one end of which is connected to the pressure roller or the swing arm, and the other end is fixed to the base, so that the pressure roller elastically presses against the electrode sheet on the winding needle.

[0014] In this example, the elastic element allows the pressure roller to press against the surface of the electrode wound on the winding needle in real time, and has a certain pressure to avoid the situation where the pressure roller bounces up without contacting the electrode, so that the single winding mechanism of the electrode can be used continuously and stably.

[0015] In one embodiment of this utility model, the elastic element is a torsion spring, which includes a main body and two pressing parts extending from the main body. The main body is sleeved on the rotation axis of the fixing element, and the free end of each pressing part is bent and extended to form an arc-shaped hook structure.

[0016] One of the arc-shaped hook structures is hung on the fixing block of the swing arm, and the other arc-shaped hook structure is hung on the fixing block of the fixing member.

[0017] In this example, the torsion spring is designed to ensure that the swing arm always drives the pressure roller to press against the circumference of the winding needle. The arc-shaped hook structure of the torsion spring can tightly encircle the fixed structure connected to it, achieving a stable installation effect. This effectively solves the problem of disengagement, allowing the pressure roller to press against the needle in real time and stably realize the single-winding function of the electrode sheet.

[0018] In one embodiment of this utility model, the arc-shaped hook structure is a circular arc hook, and the ratio of the opening size of the arc-shaped hook structure in the circumferential direction to the circumference of the circle it encloses is i, where i is less than or equal to 1 / 5.

[0019] In this embodiment, the arc-shaped hook structure can provide a more stable fixing effect, further improving the stability of the torsion spring.

[0020] In one embodiment of this utility model, the length of the swing arm is defined as L, the shortest distance from the center of the fixing member to the periphery of the coiling needle is defined as H, and the radius of the coiling needle is defined as R, wherein L > H + 1 / 2 * R.

[0021] In this embodiment, setting the length of the swing arm within this range can prevent overshooting, prevent the function of pressing the electrode sheet from failing, improve the stability of the pressing component, and thus enable the electrode sheet single-roll mechanism to achieve a stable electrode sheet single-roll function.

[0022] In one embodiment of this utility model, the length of the pressure roller is S1 and the length of the winding needle is S2, wherein -5mm≤S1-S2≤5mm.

[0023] In this example, the pressure rollers within this length range can effectively press down the tabs of the electrode sheets, effectively reducing tab lifting and chipping, and improving the processing environment of the cell winding device.

[0024] In one embodiment of this utility model, the winding needle includes two opposing half-needles with a gap between them, the size of which is G, and the diameter of the pressure roller is D, wherein 2G < D < 4G.

[0025] In this example, the pressure roller within this diameter range can reduce the occurrence of jamming in the winding needle gap, reduce the failure of the single-winding mechanism of the electrode sheet, and lower the failure rate.

[0026] In one embodiment of this utility model, a smoothing member is provided on one side of the winding needle, and the smoothing member guides the electrode sheet into the winding needle.

[0027] In this embodiment, the smoothing element can improve the stability of electrode feeding during the initial winding stage.

[0028] In one embodiment of the present invention, the smoothing member has two fixed surfaces arranged opposite to each other, and a guide surface connecting the two fixed surfaces, the guide surface being used to abut the free end of the electrode sheet;

[0029] The guiding surface is planar and forms an angle α with one of the fixed surfaces, wherein α is greater than or equal to 60° and less than or equal to 90°.

[0030] In this example, the guide surface within this angle range can accommodate both normal transmission electrodes and wavy electrodes, reducing the occurrence of electrode slippage and breakage.

[0031] In one embodiment of the present invention, a first driving component is further included. The first driving component is disposed on the base and drives the winding needle to rotate.

[0032] And / or, it also includes a second driving component, which is driven and connected to the base to drive the base to move the winding needle so that the winding needle has a winding position extending out of the winding electrode and a retracted and recessed reset position.

[0033] In this example, the first driving component drives the winding needle to rotate, thereby achieving automatic winding of the electrode sheet.

[0034] After receiving the signal from the single-coil electrode, the second drive component moves the base, thereby moving the winding needle to the winding position. After winding is completed, it returns to the reset position, ensuring that the normal winding of the cell winding device is not disturbed and saving costs.

[0035] This utility model also proposes a battery cell winding device, including the electrode single-winding mechanism as described above.

[0036] In one embodiment of this utility model, there are two electrode single-winding mechanisms, which are used to wind the positive electrode and the negative electrode respectively.

[0037] In this example, two electrode single-winding mechanisms wind the positive electrode and the negative electrode respectively, which can improve the processing efficiency of the cell winding device and further save the cost of the separator.

[0038] This utility model also proposes a battery processing equipment, including the cell winding device described in any of the above. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the electrical equipment of this utility model;

[0041] Figure 2 This is a partial exploded view of the battery of this utility model;

[0042] Figure 3This is a partial structural schematic diagram of an embodiment of the electrode single-winding mechanism of this utility model;

[0043] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0044] Figure 5 This is a partial structural schematic diagram from another perspective of an embodiment of the electrode single-winding mechanism of this utility model;

[0045] Figure 6 This is a partial structural schematic diagram of another embodiment of the electrode single-winding mechanism of this utility model;

[0046] Figure 7 for Figure 6 The planar schematic diagram shown is taken from another perspective of the smoothing component when smoothing the positive electrode plate.

[0047] Figure 8 for Figure 6 The diagram shows another view of the smoothing component when smoothing the offset electrode.

[0048] Explanation of icon numbers:

[0049] 100. Battery assembly; 10. Housing; 11. First part; 12. Second part; 20. Battery cell; 200. Controller; 300. Motor; 400. Electrode single-winding mechanism; 410. Winding needle; 411. Half needle; 412. Gap; 420. Pressing assembly; 421. Fixing component; 422. Swing arm; 423. Pressure roller; 430. Bearing; 431. Dustproof component; 440. Elastic component; 441. Main body; 442. Pressing part; 4421. Arc-shaped hook structure; 4222. Opening; 450. Smoothing component; 451. Guide surface; 452. Fixing surface.

[0050] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] Furthermore, the use of terms such as "first" and "second" in this utility model 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0055] Batteries mentioned in this art can be classified into disposable batteries and rechargeable batteries based on whether they are rechargeable. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. The batteries described in the embodiments of this utility model refer to rechargeable batteries. The following description will primarily use lithium-ion batteries as an example to illustrate the embodiments disclosed in this utility model. It should be understood that the embodiments disclosed in this utility model are applicable to any other suitable type of rechargeable battery. The batteries mentioned in the embodiments disclosed in this utility model can be directly or indirectly used in suitable devices to power those devices.

[0056] The battery mentioned in the embodiments disclosed in this utility model refers to a single physical module comprising one or more battery cells to provide a predetermined voltage and capacity. It can be a battery module or a battery pack. A battery cell is the basic unit of a battery and can be used to manufacture battery modules or battery packs. A battery module is formed by connecting a certain number of battery cells in series and / or parallel and placing them in a frame to protect the battery cells from external impacts, heat, vibration, etc. A battery pack generally includes battery modules, a battery management system, and a housing to house the battery modules and the battery management system.

[0057] A single battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate includes a positive current collector and a positive active material layer, which is coated on the surface of the positive current collector. The positive current collector includes a positive current-collecting section and a positive electrode tab connected to it. The positive current-collecting section is coated with the positive active material layer, while the positive electrode tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode plate includes a negative current collector and a negative active material layer, which is coated on the surface of the negative current collector. The negative current collector includes a negative current-collecting section and a negative electrode tab connected to it. The negative current-collecting section is coated with the negative active material layer, while the negative electrode tab is not. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0058] Electrode components are a crucial part of a battery cell. Based on their fabrication methods, they can be categorized into wound electrode components and stacked electrode components. In wound electrode components, the positive electrode, separator, and negative electrode are sequentially stacked and wound two or more times. In stacked electrode components, multiple positive and negative electrode components are alternately stacked. Among these, the winding process is currently a more mature technology with high processing efficiency, hence its wider application.

[0059] Currently, during the winding process, the positive electrode roll, negative electrode roll, and separator roll are unwound separately, and after tension control and correction operations, they are transported to the winding station by a guiding mechanism. To improve processing quality, inspection devices are installed during the conveying process to check the electrodes. When defective electrodes are found, due to the special nature of the winding machine, the only option is to wind the defective electrodes together with good separators and then reject them. This results in the waste of a large amount of good separators, and the material cost of separators accounts for a high proportion of the cell cost, making the winding cost of the electrode assembly high.

[0060] Therefore, related technologies have added a single-winding mechanism to the winding equipment. When defective electrodes are found, they are wound separately, cut, and removed. Subsequent electrodes are then wound together with good separators, thus reducing separator waste and lowering processing costs. However, the existing single-winding mechanism has an unreasonable structural design, resulting in a high failure rate, such as winding jamming, pressure roller failure, and severe chipping, affecting production efficiency. Conversely, closing the mechanism, i.e., reducing its opening rate, does not achieve the cost reduction effect.

[0061] Therefore, in order to solve the above problems, this utility model proposes an electrode single-winding mechanism. By improving the bearings that are prone to jamming during the winding process and adding dustproof parts, the entry of dust and debris can be effectively reduced, thereby reducing the failure rate of pressure roller jamming. According to the test, it has been reduced from the original 5% to almost no failure, ensuring the normal and continuous use of the electrode single-winding mechanism, improving production efficiency, and saving processing costs.

[0062] The batteries processed by the battery processing equipment disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] The following embodiments are for illustrative purposes only and refer to... Figure 1 The following description will be based on an embodiment of an electrical device, specifically a vehicle.

[0064] Figure 1 The electrical equipment provided in some embodiments of this application is a structural schematic diagram of 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. A battery 100 is installed inside the vehicle, and the battery 100 can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to power the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0065] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0066] refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and at least two battery cells 20. The housing 10 provides a receiving space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and the first portion 11 and the second portion 12 together define the receiving space. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the receiving space; the first portion 11 and the second portion 12 may also be hollow structures with one side open, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration to form a whole, and are housed within the housing 10. A mixed configuration means that some of the multiple battery cells 20 are connected in series and others in parallel. The battery device 100 may also include other structures, such as a busbar component, for realizing electrical connections between the multiple battery cells 20.

[0068] The battery cell 20 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, etc. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0069] In some cases, the battery cell 20 can be directly installed in the vehicle without the casing 10, that is, it does not need to form a battery pack, and the structure of the vehicle body itself serves as the fixing structure for the battery cell 20.

[0070] Please refer to Figure 3 and Figure 5 In one embodiment of the present invention, the electrode single-winding mechanism 400 includes a base, a winding needle 410 and a pressing assembly 420. The winding needle 410 is rotatably disposed on the base and is used to wind the electrode.

[0071] The pressing assembly 420 includes a fixing member 421, a swing arm 422, and a pressure roller 423. The fixing member 421 is mounted on the base and located on one side of the winding needle 410. One end of the swing arm 422 is rotatably connected to the fixing member 421, and the other end is rotatably connected to the pressure roller 423. The axial direction of the pressure roller 423 is the same as the axial direction of the winding needle 410, so as to press against the electrode sheet on the winding needle 410.

[0072] Two bearings 430 are provided at the rotatable connection between the two ends of the pressure roller 423 and the swing arm 422, and at least one bearing 430 is provided with a dustproof part 431 on its outward side.

[0073] In this example, the electrode single-winding mechanism 400 is used to individually wind defective electrodes that need to be recycled. These defective electrodes can be either positive or negative electrodes. The base here is a structure that provides a mounting foundation for other components. It can be a separately installed mounting base or mounting plate, or a shared mounting platform, etc., and is not limited here. The winding needle 410 is a needle structure used for winding the electrode. It is generally cylindrical and optionally includes two half-needles 411. The two half-needles 411 are spaced apart to form a gap 412 between them. This gap 412 is used to allow the electrode to be fixed in place and to begin rotational winding. The structure of the winding needle 410 is similar to existing structures and will not be described in detail here.

[0074] The winding needle 410 is rotatably mounted on the base. In one example, the electrode single-winding mechanism 400 includes a first driving component. The first driving component is mounted on the base and drives the winding needle 410 to rotate. This example is for automatic winding, which can improve the winding efficiency of defective electrodes, thereby improving the winding efficiency of the battery cell. The specific structure of the first driving component is not limited; it only needs to be a component that can generate driving force and drive the winding needle 410 to rotate. For example, it can be directly driven by a drive motor or drive motor 300, or it can be indirectly driven by a drive motor or drive motor 300 through a transmission structure. In other examples, it can be manual winding. In manual winding, manual intervention is required after the electrode enters the winding needle 410 to drive the winding needle 410 to rotate and wind.

[0075] The clamping assembly 420 is a component used to apply pressure to the electrode sheet wound on the coil needle 410, thereby statically smoothing and clamping the electrode sheet. The clamping assembly 420 includes a fixing member 421, which is used to fix the assembly. For example, it can be a fixing block connected to the base by threads, or a fixing frame connected to the base by a snap or other detachable connection method, or it can be an integrally formed structure with the base. No limitation is made here.

[0076] The clamping assembly 420 also includes a swing arm 422 and a pressure roller 423. The swing arm 422 has an extended length, and one end of the swing arm 422 is rotatably connected to the fixing member 421, allowing it to swing around the fixing member 421 as a fulcrum. This allows it to drive the pressure roller 423 to adjust its pressure in real time according to changes in the winding size. The cross-sectional shape of the swing arm 422 is not limited; for example, it can be circular, square, or other shapes. The material of the swing arm 422 can be metal, which has high structural strength and is not easily deformed. The connection between the swing arm 422 and the fixing member 421 can be such that one end of the swing arm 422 has a protruding shaft and the fixing member 421 has a shaft hole, or the fixing member 421 has a protruding shaft and one end of the swing arm 422 has a shaft hole, thereby achieving a stable and non-dropping yet loose and swingable rotational connection.

[0077] The pressure roller 423 is rotatably connected to the other end of the swing arm 422, thereby making rolling contact with the electrode surface, reducing friction with the electrode and improving winding efficiency. Since the pressure roller 423 is in direct contact with the electrode, its material can be silicone, rubber, or plastic, etc., without limitation. To improve structural stability, the other end of the swing arm 422 is provided with a shaft, which passes through the inside of the pressure roller 423, allowing the pressure roller 423 to rotate relative to the shaft. A bearing 430 is provided between the shaft and the pressure roller 423. The bearing 430 can be of a different type as needed, and a dustproof component 431 can be added to the exterior of at least one side of the bearing 430. This dustproof component 431 can be a sealing ring or a cover structure, and can be installed on the axial side of the bearing 430, without limitation.

[0078] The electrode single-winding mechanism 400 of this utility model winds up the defective electrode that needs to be recycled by rotating the winding needle 410. The swing arm 422 of the pressing component 420 can rotate relative to the fixed part 421, thereby driving the pressure roller 423 to rotate and press against the surface of the electrode to achieve the pressing of the wound electrode, so that the electrode will not loosen. A bearing 430 is provided between the pressure roller 423 and the swing arm 422, which makes the rotation of the pressure roller 423 smoother and reduces wear between the two. At least one bearing 430 has a dustproof component 431 on the side facing outward, that is, the side away from the inside of the pressure roller 423. The dustproof component 431 can effectively seal the bearing 430, thereby preventing dust or falling debris from entering the bearing 430 during the winding process, effectively reducing the failure of the bearing 430 due to jamming, so that the pressure roller 423 can continuously and stably press the electrode sheet, reduce the failure rate of the single winding mechanism 400 of the electrode sheet, and thus improve its opening rate. This increases production efficiency while reducing the waste of the separator and saving battery processing costs.

[0079] Please continue to refer to Figure 5 In one embodiment of this utility model, the dustproof component 431 is a dustproof cover, and the bearing 430 is a needle roller bearing or a deep groove ball bearing.

[0080] Needle roller bearings are a special type of rolling bearing. Their core characteristic is the use of slender cylindrical needle rollers as rolling elements, providing high load-carrying capacity within a very small radial space, making them suitable for compact, heavy-duty applications. In one example, selecting needle roller bearing 430 increases speed and saves space. The dust cover can be removably installed on bearing 430 for easy maintenance and replacement. It can be added to existing bearings 430, saving costs. In other examples, needle roller bearing models with "Z" or "ZZ" can also be directly selected, simplifying installation and improving dust protection.

[0081] Deep groove ball bearings are a type of rolling bearing, characterized by continuous deep, curved raceway grooves on both inner and outer rings. They can simultaneously withstand radial loads and bidirectional axial loads. In another example, bearing 430 is chosen as a deep groove ball bearing, which reduces friction, allows for high speeds, effectively improves heat dissipation, and offers a simple structure for easy maintenance, thus saving costs. An additional dust cover can be selected for installation with the deep groove ball bearing 430, or a standard deep groove ball bearing 430 with a Z or ZZ designation can be directly selected.

[0082] Choosing needle roller bearings or deep groove ball bearings with dust covers can increase the bearing's speed to 430 rpm, provide better heat dissipation, and facilitate installation and maintenance.

[0083] Please combine Figure 3 and Figure 4 In one embodiment of the present invention, the pressing assembly 420 further includes an elastic element 440, one end of which is connected to the pressure roller 423 or the swing arm 422, and the other end is fixed to the base, so that the pressure roller 423 elastically presses against the electrode sheet on the winding needle 410.

[0084] In this example, the elastic element 440 refers to a structure that has a certain elastic deformation under a certain pressure, such as a compression spring, tension spring, or torsion spring, or it can be a spring sheet or other types, which are not limited here. The elastic element 440 can maintain a restoring force in real time based on the force applied to it by other components. For example, one end of the elastic element 440 is connected to the pressure roller 423 or the swing arm 422, and the other end is fixed to the base, so that the elastic element 440 is in a compressed or expanded state, thereby enabling the elastic element 440 to have an opposite restoring force on the pressure roller 423, thereby achieving elastic pressure against the surface of the electrode sheet wound on the winding needle 410.

[0085] The elastic element 440 allows the pressure roller 423 to press against the surface of the electrode wound on the winding needle 410 in real time, and has a certain pressure. As the thickness of the wound electrode gradually increases, it avoids the situation where the pressure roller 423 bounces up without contacting the electrode, so that the electrode single winding mechanism 400 can be used continuously and stably.

[0086] Please continue to refer to Figure 3 and Figure 4 In one embodiment of the present invention, the elastic element 440 is a torsion spring, which includes a main body 441 and two pressing parts 442 extending from the main body 441. The main body 441 is sleeved on the rotating shaft of the fixing element 421, and the free end of each pressing part 442 is bent and extended to form an arc-shaped hook structure 4421.

[0087] One arc-shaped hook structure 4421 is hung on the fixing block of the swing arm 422, and another arc-shaped hook structure 4421 is hung on the fixing block of the fixing member 421.

[0088] In this example, the elastic element 440 is a torsion spring, which includes a spiral main body 441 and two pressing parts 442 extending from the main body 441. The two pressing parts 442 are set at a certain angle. The main body 441 is sleeved on the rotating shaft of the fixing member 421, that is, on the rotating shaft at the rotatable connection between the fixing member 421 and the swing arm 422, which limits its position. One pressing part 442 is fixed on the swing arm 422, and the other pressing part 442 is fixed on the fixing member 421. During the electrode winding process, as the winding diameter increases, it will push the swing arm 422 and the pressure roller 423 to move away from the winding needle 410, which will cause one of the pressing parts 442 to have an expansion tendency. This will cause the torsion spring to have a downward restoring force on the swing arm 422, which will keep the pressure roller 423 in a pressing state, avoiding the situation of bouncing and not pressing the electrode tightly, improving the winding quality, and making the electrode single winding mechanism 400 have good stability in use. In this design, the free ends of the pressing portion 442 are all bent to form arc-shaped hook mechanisms. Specifically, the free ends are bent towards the main body 441 to form an arc shape, and the line connecting the starting point and the ending point of the bend is at least perpendicular to the pressing portion 442, or forms an acute angle with the length direction of the pressing portion 442, thus forming a hook structure that limits the direction of force on the pressing portion 442. Simultaneously, an arc-shaped hook structure 4421 is connected to the swing arm 422, which avoids affecting the surface of the pressure roller 423 and improves the pressing effect of the pressure roller 423. In other examples, one arc-shaped hook structure 4421 can be fixed at the connection between the pressure roller 423 and the swing arm 422, and another arc-shaped hook structure 4421 can be fixed at a fixed position on the base.

[0089] The torsion spring allows the swing arm 422 to always drive the pressure roller 423 to press against the circumference of the winding needle 410. The arc-shaped hook structure 4421 of the torsion spring can tightly encircle the fixed structure connected to achieve a stable installation effect, thereby effectively solving the problem of disengagement and enabling the pressure roller 423 to press against the needle in real time, thus stably realizing the single winding function of the electrode sheet.

[0090] In other examples, the elastic element 440 can also be a compression spring. The extension direction of the compression spring is perpendicular to the length direction of the swing arm 422. One end is fixed to the base, and the other end is directly connected to both ends of the pressure roller 423. The compression spring is in a compressed state, so that the compression spring always elastically presses against the electrode.

[0091] Please refer to Figure 5 In one embodiment of this utility model, the arc hook structure 4421 is a circular arc hook, and the ratio of the size of the opening 4222 of the arc hook structure 4421 in the circumferential direction to the circumference of the circle it encloses is i, where i is less than or equal to 1 / 5.

[0092] In this embodiment, the arc hook structure 4421 is an arc hook, so the arc hook structure 4421 forms at least a semi-circular structure, thereby achieving a stable connection with the fixing member 421 and the swing arm 422.

[0093] In this example, the arc-shaped hook structure 4421 is designed with an opening 4222 in its circumferential direction. This means the free end of the arc-shaped hook structure 4421 does not abut against the main body of the pressing part 442. The circumference of the circle formed by the arc hook refers to the circumference of a circle defined with the center of the arc hook as the center point. The size of the opening 4222 is less than or equal to 1 / 5 of the circumference of the circle formed by the arc hook, for example, 1 / 6, 1 / 7, 1 / 8, 1 / 9, etc. This further enhances the stability of the arc-shaped hook structure 4421 when it is attached to the swing arm 422 and the fixing member 421, preventing disengagement. Optionally, this ratio i can also be 0, allowing the free end of the arc hook to abut against the main body of the pressing part 442, forming a closed circle, further preventing disengagement and improving the stability of the torsion spring.

[0094] The arc-shaped hook structure 4421 of this structure can have a more stable fixing effect, further improve the stability of the torsion spring, and ensure that the pressure roller 423 always has effective pressure, thereby improving the stability of the electrode single-winding mechanism 400.

[0095] Please refer to Figure 4 In one embodiment of this utility model, the length of the swing arm 422 is defined as L, the shortest distance from the center of the fixing member 421 to the periphery of the coiling needle 410 is defined as H, and the radius of the coiling needle 410 is defined as R, wherein L > H + 1 / 2 * R.

[0096] In this embodiment, the swing arm 422 has a length direction, which is a straight line from the fixing member 421 toward the pressure roller 423. Its length is set as L, specifically the distance between one end of the swing arm 422 connected to the fixing member 421 and the other end connected to the pressure roller 423. The shortest distance from the center of the fixing member 421 to the periphery of the needle coil 410 is the distance between the intersection of the line connecting the center of the fixing member 421 and the center of the needle coil 410 and the periphery of the needle coil 410, and the center of the fixing member 421. This shortest distance is set as H, and L is limited to H + 1 / 2 * R. For example, L is equal to the sum of H and the diameter of the needle coil 410, thereby ensuring that the pressure roller 423 is always on one side of the needle coil 410, preventing the pressure roller 423 from shifting to the other side and failing to provide pressure.

[0097] When the length of the swing arm 422 is set within this range, the pressure roller 423 can be prevented from overstepping, the working stability of the pressure roller 423 can be improved, the function of pressing the electrode sheet can be prevented from failing, the stability of the pressing assembly 420 can be improved, and the electrode sheet single-winding mechanism 400 can achieve a stable electrode sheet single-winding function, thereby reducing its failure rate.

[0098] Please refer to Figure 5 In one embodiment of this utility model, the length of the pressure roller 423 is S1, and the length of the winding needle 410 is S2, wherein -5mm≤S1-S2≤5mm.

[0099] In this example, the length of the pressure roller 423 refers to its axial dimension, and the length of the winding needle 410 is also its axial dimension. Since the width of the electrode sheet is generally less than or equal to the length of the winding needle, the length of the pressure roller 423 is set to be approximately the same as the length of the winding needle 410, i.e., -5mm ≤ S1 - S2 ≤ 5mm. For example, S1 equals S2, which allows the pressure roller 423 to completely press the electrode sheet in its axial direction, including the electrode tab portion, preventing the electrode tabs at the edge of the electrode sheet from curling and breaking, resulting in a large amount of debris falling off, and improving the pressure stability during the winding process. Alternatively, the difference between S1 and S2 can be controlled within 5mm, for example, a difference of 4mm, 3mm, 2mm, or 1mm, to meet the pressure requirements of the electrode tabs.

[0100] The pressure roller 423 within this length range can effectively press down the tabs of the electrode sheet, effectively reducing tab lifting and chipping, and improving the processing environment of the cell winding device.

[0101] Please refer to Figure 3 In one embodiment of the present invention, the winding needle 410 includes two oppositely arranged half needles 411, with a gap 412 formed between the two half needles 411. The size of the gap 412 is G, and the diameter of the pressure roller 423 is D, wherein 2G < D < 4G.

[0102] In this example, the winding needle 410 consists of two opposing and spaced-apart half-needles 411. The gap 412 between the two half-needles 411 allows the electrode sheet to extend and be fixed. During the initial winding stage, to prevent the pressure roller 423 from getting stuck in the gap 412 of the winding needle 410, the diameter D of the pressure roller 423 is set to be between 2 and 4 times the size G of the gap 412. For example, the diameter of the pressure roller 423 is 2.5, 3, or 3.5 times the size of the gap 412. Optionally, based on the conventional winding needle 410 size, the diameter D of the pressure roller 423 is set to be greater than 12 mm, but less than 24 mm, to save material costs.

[0103] The pressure roller 423 within this diameter range can reduce the occurrence of jamming in the gap 412 of the winding needle 410, reduce the failure of the single winding mechanism 400 of the electrode sheet, and lower the failure rate.

[0104] Please refer to Figure 6 In one embodiment of this utility model, a smoothing member 450 is provided on one side of the winding needle 410, and the smoothing member 450 guides the electrode sheet into the winding needle 410.

[0105] In this embodiment, the smoothing component 450 can guide the electrode sheet into the winding needle 410 at the initial stage of winding and smooth the electrode sheet during the subsequent winding process, making it easier and more stable to wind onto the winding needle 410. The structural type of the smoothing component 450 is not limited; it can be a smoothing plate, a smoothing roller, or other structures. The smoothing component 450 can improve the stability of electrode sheet feeding.

[0106] Please refer to Figure 7 and Figure 8 In one embodiment of the present invention, the smoothing member 450 has two fixed surfaces 452 disposed opposite to each other, and a guide surface 451 connecting the two fixed surfaces 452. The guide surface 451 is used to abut the free end of the electrode sheet.

[0107] The guiding surface 451 is planar and forms an angle α with a fixed surface 452, where α is greater than or equal to 60° and less than or equal to 90°.

[0108] In this example, the smoothing component 450 includes two opposing fixing surfaces 452. The fixing surfaces 452 are used to fix the smoothing component 450 to one side of the winding needle 410 by fasteners, serving as a fixing and limiting function. The connection method allows for easy assembly and disassembly. Optionally, the two fixing surfaces 452 are parallel to each other to further facilitate fixing. After fixing, one fixing surface 452 fits into the fixed structure, while the other fixing surface 452 faces outward. The guide surface 451 is connected to the same side of the two fixing surfaces 452 and is set at an angle to each of the two guide surfaces 452. The angle between the guide surface 451 and the fixing surface 452 facing the fixed position is set as α, where α is greater than or equal to 60° and less than or equal to 90°, for example, 65°, 70°, 75°, 80°, 85°, etc. This makes the difference between the guide surface 451 and the conveying angle of the electrode sheet smaller, making it easier to guide the electrode sheet into the winding needle 410. For example, when α is 60°, when a positively positioned electrode enters, it is usually perpendicular to the fixed surface 452. Therefore, the angle between the guide surface 451 and the electrode is approximately 30°, making it easier for the electrode to move along the guide surface 451 and be stably fed. For electrodes with offset characteristics, such as wavy electrodes, the angle between the guide surface 451 and the electrode is at most 60°, which can also play a guiding and smoothing role, preventing damage to the electrode. In optional examples, the longitudinal section of the smoothing component is trapezoidal, which is beneficial to the stability of the structure. In other examples, the smoothing component can also be triangular, thus being fixed by welding or other methods; or the surface of the smoothing component opposite to the guide surface can be curved or irregular in shape.

[0109] The guide surface 451 within this angle range can accommodate both normal transmission electrodes and wavy electrodes, reducing the occurrence of electrode slippage and breakage.

[0110] In one embodiment of the present invention, based on the limitation or non-limitation of the setting of the first driving component, the electrode single winding mechanism 400 further includes a second driving component. The second driving component is driven to be connected to the base to drive the base to move the winding needle 410 so that the winding needle 410 has a winding position that extends out to wind the electrode and a retracted position that avoids the retraction.

[0111] In this example, the specific structure of the first driving component is not limited; it only needs to be a component capable of generating driving force and rotating the winding needle 410. For example, it can be directly driven by a linear motor or cylinder, or indirectly driven by a linear motor or cylinder through a transmission structure. The winding needle 410 has a winding position, meaning that the winding needle 410 can be moved onto the path of the electrode sheet conveying, thereby directly winding the defective electrode sheet. After winding, the winding needle 410 is in the reset position, allowing the electrode sheet to be subsequently wound along the original path. Optionally, the movement of the winding needle 410 can be a straight line insertion or extension, or a circumferential swing insertion or swing withdrawal; this is not limited here.

[0112] After receiving the signal from the single-coil electrode, the second drive component drives the base to move, thereby moving the winding needle 410 to the winding position. After winding is completed, it returns to the reset position, so that the normal winding of the cell winding device is not disturbed, improving processing efficiency and saving costs.

[0113] This utility model also proposes a battery cell winding device, including the electrode single-winding mechanism 400 as described in any of the above embodiments. Since the electrode single-winding mechanism 400 in this battery cell winding device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0114] The battery cell winding device also includes a positive electrode unwinding mechanism, a negative electrode unwinding mechanism, a diaphragm unwinding mechanism, a battery cell winding needle 410, and tensioning structures and clamping and conveying structures disposed between the above structures. These can be configured according to existing structures and will not be elaborated here. An electrode single-winding mechanism 400 is disposed on the conveying path of the positive or negative electrode to perform the electrode single-winding function. The electrode single-winding mechanism 400 in this example has a low failure rate, can improve its opening rate, enhance product quality and efficiency, and effectively save costs.

[0115] In one embodiment of this utility model, there are two electrode single-winding mechanisms 400, which are used to wind the positive electrode and the negative electrode respectively.

[0116] In this example, two electrode single-winding mechanisms 400 are respectively set on the conveying paths of the positive electrode and the negative electrode, which are used to wind the positive electrode and the negative electrode separately when needed, thereby improving the processing efficiency of the cell winding device and further saving the cost of the separator.

[0117] This utility model also proposes a battery processing apparatus, including a cell winding device as described in any of the above embodiments. Since the cell winding device in this battery processing apparatus adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0118] In addition to the aforementioned cell winding device, battery processing equipment also includes hot pressing devices and subsequent process devices, which will not be elaborated here.

[0119] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pole piece single winding mechanism characterized by, include: Base; A winding needle, rotatably mounted on the base, is used to wind the electrode sheet; as well as A pressing assembly includes a fixing member, a swing arm, and a pressure roller. The fixing member is installed on the base and located on one side of the winding needle. One end of the swing arm is rotatably connected to the fixing member, and the other end is rotatably connected to the pressure roller. The axial direction of the pressure roller is the same as the axial direction of the winding needle to press against the electrode sheet on the winding needle. Two bearings are provided at the rotatable connection points between the two ends of the pressure roller and the swing arm, and at least one of the bearings is provided with a dustproof component on its outward-facing side.

2. The pole piece single winding mechanism of claim 1, wherein The dustproof component is a dust cover, and the bearing is a needle roller bearing or a deep groove ball bearing.

3. The pole piece single winding mechanism of claim 1, wherein The pressing assembly also includes an elastic element, one end of which is connected to the pressure roller or swing arm, and the other end is fixed to the base, so that the pressure roller elastically presses against the electrode sheet on the winding needle.

4. The pole piece single winding mechanism of claim 3, wherein The elastic element is a torsion spring, which includes a main body and two pressing parts extending from the main body. The main body is sleeved on the rotation axis of the fixing element, and the free end of each pressing part is bent and extended to form an arc-shaped hook structure. One of the arc-shaped hook structures is hung on the fixing block of the swing arm, and the other arc-shaped hook structure is hung on the fixing block of the fixing member.

5. The pole piece single winding mechanism of claim 4, wherein The arc-shaped hook structure is a circular arc hook, and the ratio of the opening size of the arc-shaped hook structure in the circumferential direction to the circumference of the circle it encloses is i, where i is less than or equal to 1 / 5.

6. The pole piece single winding mechanism of any one of claims 1 to 5, wherein, The length of the swing arm is defined as L, the shortest distance from the center of the fixing member to the circumference of the coiling needle is defined as H, and the radius of the coiling needle is defined as R, where L > H + 1 / 2 * R.

7. The pole piece single winding mechanism of any one of claims 1 to 5, wherein, The length of the pressure roller is S1, and the length of the winding needle is S2, wherein -5mm ≤ S1 - S2 ≤ 5mm.

8. The electrode single-roll mechanism as described in any one of claims 1 to 5, characterized in that, The winding needle includes two opposing half-needles with a gap between them, the size of which is G, and the diameter of the pressure roller is D, wherein 2G < D < 4G.

9. The pole piece single winding mechanism of any one of claims 1 to 5, wherein, A smoothing element is provided on one side of the winding needle, and the smoothing element guides the electrode sheet into the winding needle.

10. The pole piece single winding mechanism of claim 9, wherein The smoothing component has two fixed surfaces arranged opposite each other, and a guide surface connecting the two fixed surfaces, the guide surface being used to abut the free end of the electrode sheet; The guiding surface is planar and forms an angle α with one of the fixed surfaces, wherein α is greater than or equal to 60° and less than or equal to 90°.

11. The pole piece single winding mechanism of any one of claims 1 to 5, wherein, It also includes a first drive assembly, which is disposed on the base and drives the winding needle to rotate; And / or, it also includes a second driving component, which is driven and connected to the base to drive the base to move the winding needle so that the winding needle has a winding position extending out of the winding electrode and a retracted and recessed reset position.

12. An electrode core winding device characterized by comprising: Includes the single-roll electrode mechanism as described in any one of claims 1 to 11.

13. The battery cell winding apparatus of claim 12, wherein, The number of electrode single-winding mechanisms is two, and the two electrode single-winding mechanisms are used to wind the positive electrode and the negative electrode respectively.

14. A battery processing apparatus, characterized by, Includes the cell winding device as described in claim 12 or 13.

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