Winding needle structure, winding device and winding method of electrode assembly

Abstract

This application discloses a winding needle structure, a winding device, and a winding method for an electrode assembly. The winding needle structure is used to wind a diaphragm and an electrode sheet into an electrode assembly. The winding needle structure includes: a winding body, the outer peripheral surface of which is formed as a winding surface, and a recessed groove on the winding surface; and a clamping mechanism disposed within the winding body. The clamping mechanism is configured to clamp the starting end of the diaphragm within the groove. The inner wall of the groove has a plurality of first adsorption holes, and the winding body is configured to generate adsorption force at the positions of the plurality of first adsorption holes to adsorb the starting end onto the inner wall of the groove. In the above technical solution, by providing a recessed groove on the winding surface and providing a clamping mechanism to clamp the starting end of the diaphragm within the groove, the clamping mechanism can reliably fix the starting end of the diaphragm into the groove. When the electrode sheet is fed in advance, the diaphragm cannot slip or fall off, effectively preventing the problem of winding failure.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a winding needle structure, winding equipment, and winding method for electrode assemblies. Background Technology

[0002] In the lithium-ion battery cell winding process, the winding needle is a core component, and its adsorption performance directly affects the winding stability and cell quality. Existing winding needles utilize a vacuum adsorption design on their surface, generating negative pressure to adsorb the separator through adsorption holes throughout the surface, and using this adsorption force to complete the winding. Under conventional processes, when only one turn of the separator is pre-wound at the cell head, the lightweight separator allows the winding needle's adsorption force to ensure smooth winding.

[0003] However, with the optimization and upgrading of battery manufacturing processes, the pre-loading of electrode sheets into the winding process has gradually been promoted and applied in order to improve production efficiency and simplify subsequent processes. In this process scenario, the electrode sheets need to enter the winding channel simultaneously during the separator pre-winding stage and be wound together with the separator. However, the electrode sheets have a greater areal density and weight than the separator. The existing design of the full-area adsorption holes of the winding needles mainly adapts to the lightweight characteristics of the separator and is difficult to effectively support the additional gravitational load of the electrode sheets. When the electrode sheets are pre-loaded, the adsorption force on the surface of the winding needles is insufficient to simultaneously and firmly adsorb the separator and the electrode sheets, which can easily lead to problems such as loose adhesion between the electrode sheets and the separator, relative slippage, or even detachment. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a needle winding structure and a winding device including this needle winding structure, which can prevent the diaphragm from slipping or falling off, effectively preventing the problem of winding failure.

[0005] In a first aspect, embodiments of this application provide a winding needle structure for winding a diaphragm and an electrode sheet into an electrode assembly. The winding needle structure includes: a winding body, the outer peripheral surface of which is formed as a winding surface, and a recessed groove provided on the winding surface; and a clamping mechanism disposed within the winding body, the clamping mechanism being configured to clamp the starting end of the diaphragm in the groove, the inner wall of the groove being provided with a plurality of first adsorption holes, and the winding body being configured to generate an adsorption force at the positions of the plurality of first adsorption holes to adsorb the starting end onto the inner wall of the groove.

[0006] In the above technical solution, by setting a recessed groove on the winding surface and setting a clamping mechanism to clamp the starting end of the diaphragm in the groove, the clamping mechanism can reliably fix the starting end of the diaphragm in the groove. When the electrode is fed in advance, the diaphragm can be prevented from slipping or falling off, effectively preventing the problem of starting failure. By setting multiple first adsorption holes on the inner wall of the groove, the diaphragm can be sucked into the groove by vacuum adsorption and fixed in the groove. This not only facilitates the clamping component to hold the diaphragm in the groove, but also further improves the reliability of clamping and fixing the starting end of the diaphragm, further reducing the risk of the diaphragm slipping and falling off.

[0007] In some embodiments, the clamping mechanism includes a clamping member configured to be movable between a clamping position and a release position, wherein in the clamping position the clamping member clamps and secures the starting end within the groove, and in the release position the clamping member separates from the starting end, allowing the starting end to disengage from the groove.

[0008] In the above technical solution, by setting a clamping member and making the clamping member movable between the clamping position and the release position, when the clamping member is in the clamping position, the starting end of the diaphragm can be reliably fixed, reducing the risk of starting failure. When it is necessary to remove the wound electrode assembly from the winding body, the clamping member can be moved to the release position. In this way, the clamping member will not pull the starting end of the diaphragm, ensuring that the electrode assembly can be smoothly removed from the winding body.

[0009] In some embodiments, the clamping mechanism includes one or more of the clamping members, the starting end being adapted to clamp between the clamping member and the inner wall of the groove, and / or the starting end being adapted to clamp between a plurality of the clamping members.

[0010] In the above technical solution, by clamping the starting end to the inner wall of the groove, the structure of the clamping component can be simplified. By clamping the starting end between multiple clamping components, the clamping operation of the diaphragm starting end can be conveniently realized, thereby improving the clamping efficiency and reliability of the starting end.

[0011] In some embodiments, the clamping mechanism includes two clamping members arranged circumferentially on the wound body.

[0012] In the above technical solution, by arranging two clamping members along the circumference of the winding body, the number of parts can be reduced and the structure can be made more compact while ensuring the clamping effect on the starting end.

[0013] In some embodiments, when both clamping members are in the clamping position, the opposing ends of the two clamping members abut against each other to clamp the starting end; when at least one clamping member is in the release position, the opposing ends of the two clamping members separate.

[0014] In the above technical solution, by arranging two clamping members along the circumference of the winding body to cooperate in clamping the starting end of the diaphragm, the clamping of the starting end can be easily realized, and the structure of the clamping mechanism can be simplified.

[0015] In some embodiments, in the circumferential direction of the winding body, the opposite ends of the two clamping members are rotatably connected to the winding body.

[0016] In the above technical solution, by making the opposite ends of the two clamping members rotatably connected to the winding body, it is not only convenient to realize the movement of the clamping members between the clamping position and the release position, thus improving the clamping efficiency of the diaphragm winding end, but also to avoid the clamping members occupying the space outside the groove during rotation, thus creating a compact winding needle structure.

[0017] In some embodiments, the two clamping members are arranged symmetrically in the width direction of the groove.

[0018] In the above technical solution, by symmetrically arranging two clamping members in the width direction of the groove, when the two clamping members cooperate to clamp the starting end of the diaphragm, the clamping force can be evenly distributed in the width direction of the groove, thereby improving the clamping stability of the diaphragm.

[0019] In some embodiments, the clamping mechanism further includes an elastic element connected between the clamping member and the winding body, the elastic element being configured to consistently push the clamping member toward the clamping position.

[0020] In the above technical solution, by setting an elastic element connecting the clamping member and the winding body, the elastic element can always push the clamping member towards the clamping position and always push the two clamping members to abut against each other. This can further increase the clamping force of the clamping member on the diaphragm and further improve the clamping stability of the clamping mechanism on the starting end. In addition, when the clamping member is in the release position, the elastic element can also push the clamping member back to the clamping position, realizing the automatic reset of the clamping member.

[0021] In some embodiments, the clamping mechanism further includes: a mounting member and a first driving member, wherein the mounting member is fixed to the end of the elastic member away from the clamping member, and the first driving member is connected to the mounting member and is used to drive the mounting member to move along the length direction of the elastic member.

[0022] In the above technical solution, by setting up an mounting component and a first driving component, the first driving component can drive one end of the elastic component to move through the mounting component, so as to release the pushing force of the elastic component on the clamping component toward the clamping position. Thus, it is convenient to control the clamping mechanism to release the diaphragm, avoid the problem of poor needle removal caused by the diaphragm being clamped, and avoid the problem of the electrode being carried out and causing the electrode to move.

[0023] In some embodiments, the clamping mechanism further includes a second driving member connected to the clamping member for driving the clamping member to move toward the release position.

[0024] In the above technical solution, by setting a second driving component, it is convenient to drive the clamping component to release the starting end of the diaphragm, which facilitates the unloading operation of the electrode assembly after winding is completed.

[0025] In some embodiments, the clamping member is plate-shaped, and one end of the two clamping members facing each other is provided with a folded edge. In the clamping position, the folded edges of the two clamping members extend along the depth direction of the groove and abut against each other in the circumferential direction of the wound body.

[0026] In the above technical solution, by setting folded edges at the opposite ends of the two clamping members, the two clamping members can abut against each other through the folded edges, which can reduce the positional accuracy requirements of the two clamping members when they abut, reduce the difficulty of abutting the two clamping members, and ensure that the two clamping members can reliably and effectively clamp the diaphragm.

[0027] In some embodiments, the clamping member is disposed on one side of the groove in the width direction when in the release position, and the clamping member presses against the other sidewall of the groove when in the clamping position.

[0028] In the above technical solution, by arranging the clamping member at the release position on one side of the groove in the width direction and making the clamping member at the clamping position abut against the other side wall of the groove, it is convenient for the clamping member to press the diaphragm against the side wall of the groove, which facilitates the clamping member to clamp and fix the diaphragm, thereby improving the clamping efficiency and clamping reliability of the diaphragm.

[0029] In some embodiments, the clamping mechanism further includes a third driving member connected to the clamping member for driving the clamping member to move between the clamping position and the release position along the width direction of the groove.

[0030] In the above technical solution, by setting a third driving component, the clamping component can be easily driven to move between the clamping position and the release position, which facilitates the clamping and release operation of the diaphragm, improves the clamping and release efficiency, and enhances the clamping reliability and release stability of the diaphragm winding end.

[0031] In some embodiments, in the width direction of the groove, a plurality of the first adsorption holes are arranged on one side of the center line of the groove perpendicular to the width direction.

[0032] In the above technical solution, by arranging multiple first adsorption holes on one side of the groove perpendicular to the center line of the width direction, the starting end of the diaphragm can be easily sucked into the groove, and the diaphragm can be attached to one side wall of the groove, thereby facilitating the clamping member to press the diaphragm against one side inner wall of the groove.

[0033] In some embodiments, the winding body includes two separate half-rollers arranged symmetrically about the central axis of the winding body, and the groove is formed on the circumferential surface of at least one half-roller.

[0034] In the above technical solution, by making the winding body include two separately arranged half rollers, a gap can be formed between the two half rollers, which facilitates the insertion of the feeding clamp needle and facilitates the unloading of the wound electrode assembly from the winding body.

[0035] In some embodiments, the groove is positioned close to another half-roller in the circumferential direction of the wound body.

[0036] In the above technical solution, by setting the groove closer to the other half roller, the electrode sheet can be fed closer to the edge of the half roller, thereby reducing the cutting of the electrode sheet, reducing electrode sheet waste, and improving material utilization.

[0037] In some embodiments, the groove extends through both end faces of the winding body along its axial direction, and the cross-section of the groove is arc-shaped.

[0038] In the above technical solution, by making the groove pass through both ends of the winding body, the groove processing can be facilitated, ensuring that the groove can fully accommodate and hold the diaphragm. By making the cross-section of the groove arc-shaped, the risk of local stress concentration in the winding body can be reduced, and the service life of the winding body can be improved.

[0039] In some embodiments, an adsorption area is provided on the outer peripheral surface of the winding body, the adsorption area and the groove are arranged at intervals in the circumferential direction of the winding body, the adsorption area is provided with a plurality of second adsorption holes, and the winding body is configured to generate adsorption force at the positions of the plurality of second adsorption holes to adsorb the diaphragm onto the winding surface.

[0040] In the above technical solution, by setting multiple second adsorption holes on the outer peripheral surface of the winding body, the diaphragm and electrode can be adsorbed onto the winding surface by vacuum adsorption, so that the diaphragm and electrode are firmly attached to the winding surface, further improving the stability of the diaphragm fixation and reducing the risk of the diaphragm slipping and wrinkling.

[0041] Secondly, embodiments of this application provide a winding apparatus including a winding needle structure according to the first aspect of this application.

[0042] In the above-mentioned technical method, since the winding equipment is equipped with the above-mentioned winding needle structure, the winding needle structure has a recessed groove on the winding surface, and a clamping mechanism is provided to clamp the starting end of the diaphragm in the groove. The clamping mechanism can reliably fix the starting end of the diaphragm in the groove. When the electrode sheet is fed in advance, the diaphragm can be prevented from slipping or falling off, effectively preventing the problem of starting failure, thereby improving the production efficiency of the winding equipment.

[0043] In some embodiments, the winding device further includes a turntable, the winding device having a starting station, a winding station and a unloading station arranged sequentially along the rotation direction of the turntable, the needle structure being rotatably disposed on the turntable, the number of the needle structures being multiple, and the multiple needle structures being arranged at intervals along the circumference of the turntable.

[0044] In the above technical solution, by setting up a turntable and setting up multiple winding needle structures on the turntable, the multiple winding needle structures can flow sequentially between multiple processing stations, which significantly improves the production efficiency of the winding equipment.

[0045] In some embodiments, the winding apparatus further includes a top film mechanism configured to push the diaphragm into the groove.

[0046] In the above technical solution, by setting a top membrane mechanism and using the top membrane mechanism to push the diaphragm into the groove, the clamping mechanism can easily clamp the diaphragm in the groove, reducing the clamping difficulty of the clamping mechanism and simplifying the structure of the clamping mechanism.

[0047] In some embodiments, the top film mechanism includes a top film roller and a top sheet, the top sheet being fixed to the top film roller and extending radially outward along the top film roller, the top film roller being movable between an initial position and a top film position, in the initial position being away from the winding station, and in the top film position being close to the winding station, and the top sheet being extendable into the groove of the winding needle structure located at the winding station.

[0048] In the above technical solution, by setting a top film roller and a top sheet, the top film roller can be moved to the top film position when it is necessary to push the diaphragm into the groove, so as to facilitate pushing the starting end of the diaphragm into the groove. When it is not necessary to push the diaphragm, the top film roller can be moved back to the initial position to avoid interference between the top film mechanism and the winding needle structure and turntable.

[0049] In some embodiments, the winding apparatus further includes a film cutting mechanism disposed between the starting station and the winding station and near the winding needle structure of the starting station, the film cutting mechanism being used to cut the diaphragm.

[0050] In the above technical solution, by setting up a film cutting mechanism and arranging it between the starting station and the winding station to cut the diaphragm, the diaphragm conveying path and cutting response time can be shortened, the process interval time can be reduced, the continuous operation efficiency of the winding equipment can be improved, and the material waste of the diaphragm can also be reduced.

[0051] Thirdly, embodiments of this application provide a method for winding an electrode assembly, the method being applied to a winding apparatus according to a second aspect of this application, the method comprising: confirming that the diaphragm covers the groove of the winding needle structure located at the starting winding position; allowing the diaphragm covering the groove to enter the groove; the clamping mechanism clamping the starting winding end of the diaphragm within the groove; continuing to rotate the winding needle structure until the diaphragm and the electrode sheet are wound into an electrode assembly; the clamping mechanism releasing the starting winding end of the diaphragm; and removing the wound electrode assembly from the winding needle structure.

[0052] In the above technical solution, by first covering the groove of the winding needle structure with the diaphragm at the starting station, then feeding the diaphragm into the groove, and then using the clamping mechanism to clamp the starting end of the diaphragm in the groove, when the electrode sheet is fed in advance, the diaphragm can be prevented from slipping or falling off, effectively preventing the problem of starting failure, and improving winding efficiency and winding quality.

[0053] In some embodiments, the step of moving the diaphragm covering the groove into the groove includes: driving the top film roller of the top film mechanism to rotate, the top film roller driving the top sheet to rotate, the top sheet pushing the diaphragm covering the groove into the groove; the top film roller driving the top sheet to push the diaphragm between two clamping members; and the top film roller driving the top sheet to exit the groove.

[0054] In the above technical solution, the rotation of the top film roller drives the rotation of the top sheet, and the rotation of the top sheet pushes the diaphragm into the groove. This can easily push the starting end of the diaphragm into the groove, improving the efficiency of the starting end of the diaphragm entering the groove. Moreover, neither the top film roller nor the top sheet of the top film mechanism will interfere with the winding needle structure.

[0055] In some embodiments, the top film roller rotates at the same speed but in the opposite direction to the winding needle structure.

[0056] In the above technical solution, by making the top film roller and the winding needle structure rotate at the same speed but in opposite directions, the winding needle structure does not need to stop, and the top film mechanism can push the diaphragm into the groove, thereby improving the winding efficiency.

[0057] In some embodiments, after the clamping mechanism clamps the starting end of the diaphragm in the groove, the winding method further includes: a film cutting mechanism cutting the diaphragm located between the starting station and the winding station.

[0058] In the above technical solution, after the clamping mechanism clamps the starting end of the diaphragm, the film cutting mechanism cuts the diaphragm between the starting station and the winding station. This disconnects the diaphragm between the starting station and the winding station, making it easier for the diaphragm at the starting station to start rolling and improving the connection efficiency between processes.

[0059] In some embodiments, the clamping mechanism releases the starting end of the diaphragm by: driving the two clamping members to move from the clamping position toward the release position, causing the opposing ends of the two clamping members to separate, thereby releasing the starting end of the diaphragm.

[0060] In the above technical solution, the release efficiency of the clamping mechanism on the starting end of the diaphragm can be improved, the friction between the clamping member and the starting end of the diaphragm can be reduced, and the clamping mechanism can be prevented from obstructing the feeding of the electrode assembly.

[0061] In some embodiments, the step of bringing the diaphragm covering the groove position into the groove includes: a film cutting mechanism cutting the diaphragm located between the starting position and the winding position at the groove position; and a plurality of first adsorption holes in the groove generating negative pressure to draw the starting end of the cut diaphragm into the groove.

[0062] In the above technical solution, by first cutting the diaphragm and then sucking the starting end of the diaphragm into the groove through negative pressure adsorption, the starting end can easily enter the groove without the need for an additional top film mechanism, reducing the number of parts and creating a compact structure.

[0063] In some embodiments, the clamping mechanism clamps the starting end of the diaphragm within the groove, comprising: driving a clamping member to move from a release position to a clamping position, the clamping member pressing the starting end of the diaphragm against the inner wall of the groove, wherein the clamping member at the release position and a plurality of the first adsorption holes are spaced apart in the circumferential direction of the needle winding structure, and the clamping member at the release position is arranged upstream of the plurality of the first adsorption holes in the rotational direction of the needle winding structure.

[0064] In the above technical solution, by arranging multiple first adsorption holes on the downstream side of the clamping member in the winding direction, and first adsorbing the starting end into the groove, and then pressing the starting end against the clamping member, the clamping member will not block the multiple first adsorption holes from sucking the starting end of the diaphragm into the groove when adsorbing the starting end. At the same time, the diaphragm adsorbed in the groove does not affect the movement of the clamping member to the clamping position, so that the clamping member can effectively clamp the starting end of the diaphragm and improve the clamping efficiency.

[0065] In some embodiments, before the clamping mechanism releases the starting end of the diaphragm, the winding method further includes: conveying the winding needle structure to the unloading station; and inserting an unloading clamping needle into the winding needle structure and clamping the electrode assembly on the winding needle structure.

[0066] In the above technical solution, by first conveying the winding needle structure to the unloading station, and then using the unloading clamp to unload the electrode assembly on the winding needle structure, the winding efficiency of the winding equipment can be improved, and the unloading process can be avoided from interfering with the winding of the electrode assembly at the winding station.

[0067] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of the winding device according to Embodiment 1 of this application;

[0069] Figure 2 yes Figure 1 The schematic diagram of the winding equipment shown illustrates that the top film mechanism pushes the diaphragm into the groove at the winding station.

[0070] Figure 3 yes Figure 2 The schematic diagram of the winding equipment shown indicates that the film cutting mechanism cuts the diaphragm at the starting station.

[0071] Figure 4 yes Figure 3 The schematic diagram of the winding equipment shown indicates that the film cutting mechanism is located away from the winding station;

[0072] Figure 5 yes Figure 4 The diagram shows the structure of the needle winding structure and electrode assembly at the unloading station;

[0073] Figure 6 yes Figure 5 The diagram shows a needle coil structure and an electrode assembly, wherein a feeding clamp needle is inserted into the needle coil structure and clamps the electrode assembly.

[0074] Figure 7 yes Figure 6 The schematic diagram of the needle winding structure and electrode assembly shown indicates that the clamping mechanism releases the starting end of the diaphragm.

[0075] Figure 8 yes Figure 7 The diagram shows the structure of the feeding clamp needle and electrode assembly.

[0076] Figure 9 yes Figure 2 A magnified view of point M, indicated by the center circle;

[0077] Figure 10 This is a schematic diagram of the winding device according to Embodiment 2 of this application;

[0078] Figure 11 yes Figure 10 The schematic diagram of the winding equipment shown indicates that the film cutting mechanism cuts the diaphragm at the starting station.

[0079] Figure 12 yes Figure 11 The schematic diagram of the winding equipment shown shows that the starting end of the diaphragm is adsorbed into the groove at the starting position;

[0080] Figure 13 yes Figure 12 The schematic diagram of the winding equipment shown shows that at the starting position, the clamping member presses the starting end against the inner wall of the groove;

[0081] Figure 14 yes Figure 13 The schematic diagram of the winding equipment shown indicates that the film cutting mechanism is located away from the winding station;

[0082] Figure 15 yes Figure 14 The diagram shows the structure of the needle winding structure and electrode assembly at the unloading station;

[0083] Figure 16 yes Figure 15 The diagram shows a needle coil structure and an electrode assembly, wherein a feeding clamp needle is inserted into the needle coil structure and clamps the electrode assembly.

[0084] Figure 17 yes Figure 16 The schematic diagram of the coiled needle structure and electrode assembly shown indicates that the clamping member releases the starting end of the diaphragm.

[0085] Figure 18 yes Figure 17 The diagram shows the structure of the feeding clamp needle and electrode assembly.

[0086] Figure 19 yes Figure 17 A magnified view of point N, indicated by the center circle;

[0087] Figure 20 This is a flowchart of a winding method for an electrode assembly according to an embodiment of this application;

[0088] Figure 21 This is a flowchart of a winding method for winding an electrode assembly using a winding device according to Embodiment 1 of this application;

[0089] Figure 22 This is a flowchart of a winding method for winding an electrode assembly using a winding device according to Embodiment 2 of this application.

[0090] Figure label:

[0091] 100. Winding equipment; 101. Starting station; 102. Winding station; 103. Unloading station;

[0092] 10. Needle winding structure; 11. Winding body; 111. Winding surface; 112. Groove; 113. First suction hole; 114. Half roller; 12. Clamping mechanism; 121. Clamping component; 122. Elastic component; 123. Mounting component;

[0093] 20. Turntable; 30. Top film mechanism; 31. Top film roller; 32. Top sheet;

[0094] 40. Film cutting mechanism; 41. Film cutting roller; 42. Cutter; 50. Pressure roller; 60. Conveyor roller; 70. Feeding clamp;

[0095] 1A. Diaphragm; 1B. Positive electrode; 1C. Negative electrode. Detailed Implementation

[0096] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0097] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0098] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0099] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0100] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0101] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0102] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0103] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0104] In the lithium-ion battery cell winding process, the winding needle is the core execution component, and its adsorption and traction performance directly determines the success rate of winding and the quality of cell formation. Current mainstream winding needles adopt a vacuum adsorption design. Adsorption holes are arranged on the surface of the winding needle, and the negative pressure within the holes generates adsorption force to attract the separator. This adsorption force then forms a pulling force to complete the winding feed of the separator. To ensure adsorption reliability, conventional processes require pre-winding the separator once, and only after the next turn of separator covers and presses against the previous turn can the electrode sheet be fed in. In this process, the pressing structure between the separators can assist in fixation, forming a double guarantee with the adsorption force of the winding needle, effectively preventing separator displacement or detachment, and ensuring stable winding.

[0105] However, with the industry's increasing demand for improved production efficiency, pre-feeding of electrode sheets is gradually becoming a development trend. In this process scenario, the electrode sheet needs to enter the winding channel simultaneously before the separator has completed its full pre-winding and has been pressed and fixed. At this time, the electrode sheet itself is under gravity load, and centrifugal force is generated during the rotation of the winding needle. These two forces are superimposed on the unstable separator and electrode sheet assembly. The vacuum adsorption force of the existing winding needle can only meet the traction requirements of a single separator and is insufficient to counteract the combined effect of gravity and centrifugal force from the electrode sheet. This easily leads to relative slippage or even complete detachment of the separator and electrode sheet, directly causing winding failure.

[0106] Based on the above considerations, in order to reduce the risk of winding failure in the winding equipment, this application designs a winding needle structure. The winding needle structure has a recessed groove on the winding surface of the winding body, and a clamping mechanism is provided to clamp the starting end of the diaphragm in the groove. The clamping mechanism can reliably fix the starting end of the diaphragm in the groove. When the electrode is fed in advance, the diaphragm can be prevented from slipping or falling off, effectively preventing the problem of winding failure.

[0107] The needle winding structure provided in this application is suitable for winding equipment and can be used in the winding process of battery manufacturing, specifically for winding electrode assemblies. During battery fabrication, the needle winding structure is used to wind the electrode sheets and separator of the electrode assembly to form the electrode assembly. The winding equipment provided in this application can be used not only in lithium-ion battery production lines but also in sodium-ion battery production lines or production lines for other types of batteries.

[0108] In this embodiment, the electrode assembly can serve as the component where the electrochemical reaction occurs within the battery cell. The battery cell can be a secondary battery, meaning a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, or lead-acid battery; this embodiment is not limited to these types. The battery cell 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.

[0109] A single battery cell typically includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0110] The electrode assembly can be a wound structure. Using a winding device, the positive electrode sheet, negative electrode sheet, and two layers of separator are fed separately and stacked in a specific order before being wound to form a wound electrode assembly. The electrode assembly can be cylindrical, cuboid, flat, or polygonal.

[0111] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0112] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0113] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0114] The structure of the needle winding structure 10 and the winding device 100 of this application will be described in detail below.

[0115] Please refer to Figures 1-4 The winding equipment 100 includes a turntable 20, a winding needle structure 10, a film cutting mechanism 40, a pressure roller 50, and multiple conveying rollers 60. The turntable 20 is disc-shaped and can rotate about a horizontally extending axis. The winding equipment 100 has multiple processing stations, including a starting station 101, a winding station 102, and a unloading station 103. The winding needle structure 10 is rotatably mounted on the turntable 20. When the turntable 20 rotates, the winding needle structure 10 on the turntable 20 can be sequentially conveyed to multiple processing stations, for example, sequentially passing through the starting station 101, the winding station 102, and the unloading station 103. The number of the winding needle structure 10 is multiple. For example, the number of the winding needle structure 10 can be two, three, four, five or more. Multiple winding needle structures 10 are arranged at intervals along the circumference of the turntable 20. In this way, multiple processing stations can have winding needle structures 10 working at the same time, thereby improving the working efficiency of the winding equipment 100.

[0116] Multiple conveying rollers 60 are used to convey the diaphragm 1A, positive electrode 1B, and negative electrode 1C to the turntable 20, and / or to convey the diaphragm 1A, positive electrode 1B, and negative electrode 1C from one processing station to another. Pressure rollers 50 are used to press the diaphragm 1A, positive electrode 1B, and / or negative electrode 1C against the winding surface 111 of the needle winding structure 10 to ensure the tightness of the electrode assembly winding on the needle winding structure 10. A film cutting mechanism 40 is used to cut the diaphragm 1A after the needle winding structure 10 has finished winding an electrode assembly, specifically to cut the diaphragm 1A connecting the winding station 102 and the take-up station 101.

[0117] The following is for reference. Figures 1-9 The description of the needle coil structure 10 according to an embodiment of the first aspect of this application is as follows.

[0118] This application provides a coiled needle structure 10, such as... Figures 5-7 and Figure 9 As shown, the winding needle structure 10 of this embodiment is used to wind the diaphragm 1A and the electrode sheet into an electrode assembly. The winding needle structure 10 includes a winding body 11 and a clamping mechanism 12. The outer peripheral surface of the winding body 11 is formed as a winding surface 111, and the winding surface 111 is provided with a recessed groove 112. The clamping mechanism 12 is disposed in the winding body 11 and is configured to clamp the starting end of the diaphragm 1A in the groove 112. The inner wall of the groove 112 is provided with a plurality of first adsorption holes 113. The winding body 11 is configured to generate an adsorption force at the positions of the plurality of first adsorption holes 113 to adsorb the starting end onto the inner wall of the groove 112.

[0119] The winding structure 10 refers to the structure in the winding equipment 100 used to wind the diaphragm 1A and the electrode sheet into an electrode assembly. The diaphragm 1A and the electrode sheet can be stacked together to form a composite sheet before winding. The electrode sheet can be a first electrode sheet and a second electrode sheet with opposite polarities, such as a positive electrode sheet 1B and a negative electrode sheet 1C. The diaphragm 1A can be two layers, and the stacked diaphragm 1A and electrode sheet can be a composite sheet formed by stacking the first electrode sheet, diaphragm 1A, second electrode sheet, and diaphragm 1A again. To enhance the structural stability of the composite sheet, the diaphragm 1A can be bonded to the electrode sheet during the stacking process, or other connection methods can be used to achieve a fixed connection between the diaphragm 1A and the electrode sheet. In the composite sheet, to reliably isolate the two electrode sheets, the size of the diaphragm 1A is generally larger than the size of the electrode sheet, so that the two ends of the diaphragm 1A can extend beyond the electrode sheet. The extended portion of the diaphragm 1A can be used for the starting and ending of the electrode assembly.

[0120] Since the two ends of the diaphragm 1A in the composite sheet can extend beyond the electrode, that is, the diaphragm 1A extending beyond the electrode is provided at both the head and tail of the composite sheet, the composite sheet can be divided into three segments along the winding direction of the composite sheet on the winding body 11, namely the head diaphragm, the laminated layer and the tail diaphragm. The head diaphragm is the portion of the diaphragm located at the head of the composite sheet and extending beyond the electrode sheet. The head diaphragm is used for the initial winding of the electrode assembly. That is, during the initial stage of winding the electrode assembly, the head diaphragm first contacts the winding needle structure 10 and can be fixed on the winding body 11 to facilitate the subsequent winding of the electrode assembly. The laminated layer is the laminated structure of the diaphragm 1A and the electrode sheet. That is, the laminated layer is the portion of the composite sheet where the diaphragm 1A and the electrode sheet are laminated. The diaphragm portion in the laminated layer is connected between the head diaphragm and the tail diaphragm, and the three can be a diaphragm made as a single unit. The tail diaphragm is the portion of the diaphragm located at the tail of the composite sheet and extending beyond the electrode sheet. The tail diaphragm is used for the final winding of the electrode assembly. During the final winding stage of the electrode assembly, the tail diaphragm can be wound around the outermost side of the electrode assembly to fix the wound electrode assembly and prevent it from loosening.

[0121] In the process of using the coiling needle structure 10 to wind the composite sheet to form an electrode assembly, the head diaphragm is first fixed and wound onto the winding body 11, and then the laminated layer and the tail diaphragm are wound sequentially to form the electrode assembly. Since the electrode sheets in the laminated layer can be connected to the diaphragm 1A through bonding or other means during the stacking process, the electrode sheets in the laminated layer can be wound together with the diaphragm 1A, so that the entire laminated layer can be wound onto the coiling needle structure 10 under the action of the head diaphragm.

[0122] The winding body 11 is used to wind a flattened composite sheet around its outer peripheral surface to form an electrode assembly. The winding body 11 can be a shaft-like structure, with its outer peripheral surface serving as the winding surface 111. The winding body 11 can rotate around its own axis to wind the flattened composite sheet into a wound electrode assembly. The cross-sectional shape of the winding body 11 can be a regular shape such as an ellipse, circle, or rhombus, or it can be an irregular shape. Depending on the shape of the winding body 11, the electrode assembly can have different shapes. In some examples, the material of the winding body 11 can be aluminum alloy or alloy steel.

[0123] The winding surface 111 has a recessed groove 112. The groove 112 extends into an elongated slot along the rotation axis of the winding body 11. The groove 112 can penetrate at least one end face of the winding body 11 in the rotation axis direction. The winding surface 111 can have one groove 112 or multiple grooves 112 arranged at intervals along the circumference of the winding body 11. The cross-section of the groove 112 can be rectangular, trapezoidal, semi-circular, or elliptical.

[0124] The clamping mechanism 12 is disposed within the winding body 11. Specifically, the winding body 11 defines an installation cavity, and the clamping mechanism 12 is disposed within the installation cavity. The winding body 11 also forms a connecting hole, through which the installation cavity communicates with the groove 112. By arranging the clamping mechanism 12 within the winding body 11, a compact structure can be achieved, ensuring that the clamping mechanism 12 does not occupy the outer space of the winding body 11. Furthermore, during the winding process of the winding body 11 winding the diaphragm 1A and the electrode sheet, the clamping mechanism 12 does not interfere with the normal winding of the diaphragm 1A and the electrode sheet onto the winding surface 111, thus ensuring the smooth progress of the winding process.

[0125] In some examples, the clamping mechanism 12 can be a clamping clamping mechanism, an adsorption clamping mechanism, and / or a pressing clamping mechanism. For example, when the clamping mechanism 12 is a clamping clamping mechanism, the clamping mechanism includes grippers for clamping the starting end of the diaphragm 1A.

[0126] In this embodiment, when the winding needle structure 10 starts winding the electrode assembly, the starting end of the diaphragm 1A is first wound onto the winding body 11. Before starting to wind the starting end, the starting end of the diaphragm 1A is clamped and fixed in the groove 112 of the winding surface 111 by the clamping mechanism 12. This can enhance the fixing reliability between the starting end of the diaphragm 1A and the winding body 11. Even if the electrode sheet is fed in advance, the clamping mechanism 12 can still have sufficient clamping force to overcome the gravity and centrifugal force of the electrode sheet, so that the starting end of the diaphragm 1A can be reliably fixed to the winding body 11, so that the diaphragm 1A does not slip or fall off, and prevents the problem of starting failure. This ensures the winding efficiency and winding quality of the electrode assembly by the winding needle structure 10.

[0127] In some examples, the inside of the winding body 11 may also be provided with a first negative pressure cavity, and multiple first adsorption holes 113 are connected to the first negative pressure cavity. The first negative pressure cavity is used to provide negative pressure. The first negative pressure cavity can be connected to a vacuum device. The vacuum device can extract the air in the first negative pressure cavity, so that negative pressure can be generated in the first negative pressure cavity. Since multiple first adsorption holes 113 are connected to the first negative pressure cavity, adsorption force can be generated at the multiple first adsorption holes 113 positions in the groove 112 to adsorb the starting end of the diaphragm 1A into the groove 112.

[0128] In some examples, the number of first adsorption pores 113 can be ten, twenty, thirty, forty or more, and the shape of the first adsorption pores 113 can be rectangular, circular, elongated, polygonal, or circular, elliptical, etc. The first adsorption pores 113 can also be irregular in shape.

[0129] In the above technical solution, by providing a recessed groove 112 on the winding surface 111 and a clamping mechanism 12 to clamp the starting end of the diaphragm 1A within the groove 112, the clamping mechanism 12 can reliably fix the starting end of the diaphragm 1A to the groove 112. When the electrode is fed in advance, the diaphragm 1A will not slip or fall off, effectively preventing the problem of starting failure. By providing multiple first adsorption holes 113 on the inner wall of the groove 112, the diaphragm 1A can be drawn into the groove 112 by vacuum adsorption and fixed to the inner wall of the groove 112. This not only facilitates the clamping member 121 to clamp the diaphragm 1A within the groove 112, but also further improves the reliability of clamping and fixing the starting end of the diaphragm 1A, further reducing the risk of the diaphragm 1A slipping and falling off.

[0130] In some embodiments of this application, such as Figures 5-7 and Figure 9 As shown, the clamping mechanism 12 may include a clamping member 121, which is configured in a clamping position (e.g., Figure 6 The location of the clamping member 121 shown) and the release position (e.g.) Figure 7 The clamping member 121 shown is movable between the positions of the clamping member 121 and the groove 112. In the clamping position, the clamping member 121 clamps and fixes the starting end in the groove 112. In the releasing position, the clamping member 121 separates from the starting end, and the starting end can be removed from the groove 112.

[0131] In some examples, the clamping member 121 is rotatably disposed within the winding body 11 so as to be rotatable between a clamping position and a release position, or the clamping member 121 is movably disposed within the winding body 11 so as to be movable between a clamping position and a release position.

[0132] In the above technical solution, by setting a clamping member 121 and making the clamping member 121 movable between the clamping position and the release position, when the clamping member 121 is in the clamping position, the starting end of the diaphragm 1A can be reliably fixed, reducing the risk of starting failure. When it is necessary to remove the wound electrode assembly from the winding body 11, the clamping member 121 can be moved to the release position. In this way, the clamping member 121 will not pull the starting end of the diaphragm 1A, ensuring that the electrode assembly can be smoothly removed from the winding body 11.

[0133] In some embodiments of this application, such as Figure 5 , Figure 9 , Figure 16 and Figure 19 As shown, the clamping mechanism 12 includes one or more clamping members 121, the starting end of which is adapted to be clamped between the clamping member 121 and the inner wall of the groove 112, and / or the starting end is adapted to be clamped between a plurality of clamping members 121.

[0134] For example, the clamping mechanism 12 may include only one clamping member 121, or it may include two, three, or four clamping members 121. The clamping mechanism 12 is configured to clamp the starting end of the diaphragm 1A between the clamping member 121 and the inner wall of the groove 112, that is, the clamping member 121 clamps the starting end of the diaphragm 1A by a top-pressing clamping method, and / or, the clamping mechanism 12 is configured to clamp the starting end of the diaphragm 1A by multiple clamping members 121 cooperating with each other, in which case the multiple clamping members 121 achieve reliable clamping of the starting end of the diaphragm 1A by a clamping method.

[0135] In some examples, the clamping mechanism 12 can also clamp the first part of the starting end between the clamping member 121 and the inner wall of the groove 112, and clamp the second part of the starting end between multiple clamping members 121, thereby further improving the clamping reliability of the starting end of the diaphragm 1A.

[0136] In the above technical solution, by clamping the starting end to the inner wall of the groove 112, the structure of the clamping member 121 can be simplified. By clamping the starting end between multiple clamping members 121, the clamping operation of the starting end of the diaphragm 1A can be conveniently realized, thereby improving the clamping efficiency and reliability of the starting end.

[0137] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the clamping mechanism 12 includes two clamping members 121 arranged circumferentially on the wound body 11.

[0138] When the clamping mechanism 12 includes two clamping members 121, the two clamping members 121 can cooperate with each other to clamp the starting end of the diaphragm 1A. The two clamping members 121 can also clamp the diaphragm 1A between the inner wall of the groove 112 and the clamping members 121.

[0139] In the above technical solution, by arranging two clamping members 121 along the circumference of the winding body 11, the number of parts can be reduced and the structure can be compacted while ensuring the clamping effect on the starting end.

[0140] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, when both clamping members 121 are in the clamping position, the opposite ends of the two clamping members 121 abut against each other to clamp the starting end. When at least one clamping member 121 is in the release position, the opposite ends of the two clamping members 121 separate.

[0141] In some examples, the clamping member 121 extends along the axial direction of the winding body 11. In the axial direction of the winding body 11, the two end edges of the clamping member 121 may be flush with the two end edges of the groove 112, or the two end edges of the clamping member 121 may be located between the two end edges of the groove 112.

[0142] In some examples, along the axial direction of the winding body 11, the two ends of the clamping member 121 extend beyond the two side edges in the width direction of the diaphragm 1A. In this way, the two clamping members 121 can completely cover and clamp the diaphragm 1A in the width direction of the diaphragm 1A, so as to ensure that the clamping force on the diaphragm 1A is evenly distributed in the width direction of the diaphragm 1A, reducing the risk of stress concentration and reducing the risk of wrinkling of the diaphragm 1A.

[0143] In the above technical solution, by arranging two clamping members 121 along the circumference of the winding body 11 to cooperate in clamping the starting end of the diaphragm 1A, the clamping of the starting end can be easily realized, and the structure of the clamping mechanism 12 can be simplified.

[0144] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, in the circumferential direction of the winding body 11, the opposite ends of the two clamping members 121 are rotatably connected to the winding body 11.

[0145] For example, both clamping members 121 are arranged within the groove 112. In the circumferential direction of the winding body 11, one end of each clamping member 121 is rotatably connected to the inner wall of the groove 112. Furthermore, one end of each clamping member 121 is respectively connected to the inner wall of the groove 112 near the opening of the groove 112. In the direction from both sides of the groove 112 towards the center of the groove 112 in the width direction, the two clamping members 121 extend obliquely towards the bottom wall of the groove 112. This increases the clamping force between the two clamping members 121 and the starting end of the diaphragm 1A, improving the clamping reliability of the starting end.

[0146] In this embodiment, the opposite ends of the two clamping members 121 are rotatably connected to the winding body 11. The rotation axis of the clamping member 121 is parallel to the axis of the winding body 11. The two clamping members 121 can rotate between a clamping position and a releasing position about their respective rotation axes. Furthermore, compared to the clamping member 121 in the clamping position, the clamping member 121 in the releasing position is positioned closer to the central axis of the winding body 11. This prevents the clamping member 121 from protruding from the groove 112 when rotating from the clamping position to the releasing position, thus avoiding the clamping member 121 occupying space outside the groove 112 and further compacting the structure.

[0147] In the above technical solution, by rotatably connecting the opposite ends of the two clamping members 121 to the winding body 11, it is not only convenient to move the clamping members 121 between the clamping position and the release position, thus improving the clamping efficiency of the starting end of the diaphragm 1A, but also to avoid the clamping members 121 occupying the space outside the groove 112 during rotation, thus making the structure of the winding needle structure 10 more compact.

[0148] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the two clamping members 121 are arranged symmetrically in the width direction of the groove 112.

[0149] In the above technical solution, by symmetrically arranging two clamping members 121 in the width direction of the groove 112, when the two clamping members 121 cooperate to clamp the starting end of the diaphragm 1A, the clamping force can be evenly distributed in the width direction of the groove 112, thereby improving the clamping stability of the diaphragm 1A.

[0150] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the clamping mechanism 12 further includes an elastic element 122, which is connected between the clamping member 121 and the winding body 11. The elastic element 122 is used to continuously push the clamping member 121 toward the clamping position.

[0151] In some examples, the elastic element 122 can be a spring or a sheet. The clamping element 121 is connected to the winding body 11 through the elastic element 122. Furthermore, there can be one or more elastic elements 122 arranged at intervals between the clamping element 121 and the winding body 11. For example, each clamping element 121 is connected to the winding body 11 through multiple elastic elements 122, and the multiple elastic elements 122 are arranged at intervals along the axial direction of the winding body 11.

[0152] In some examples, when clamping member 121 is in the clamping position, elastic member 122 is in an elastically deformed state, for example, elastic member 122 is in a compressed state, and elastic member 122 always pushes clamping member 121 against another clamping member 121. When clamping member 121 moves from the clamping position to the release position, elastic member 122 undergoes further elastic deformation, for example, elastic member 122 is further compressed. At this time, elastic member 122 has a force that pushes clamping member 121 from the release position to the clamping position.

[0153] In the above technical solution, by setting an elastic member 122 connected between the clamping member 121 and the winding body 11, the elastic member 122 can always push the clamping member 121 towards the clamping position, and always push the two clamping members 121 to abut against each other. This can further increase the clamping force of the clamping member 121 on the diaphragm 1A, and further improve the clamping stability of the clamping mechanism 12 on the starting end. In addition, when the clamping member 121 is in the release position, the elastic member 122 can also push the clamping member 121 back to the clamping position, realizing the automatic reset of the clamping member 121.

[0154] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the clamping mechanism 12 further includes: a mounting member 123 and a first driving member. The mounting member 123 is fixed to the end of the elastic member 122 away from the clamping member 121. The first driving member is connected to the mounting member 123 and is used to drive the mounting member 123 to move along the length direction of the elastic member 122.

[0155] In some examples, the elastic element 122 is a spring, one end of which is connected to the mounting element 123 and the other end of which is connected to the clamping element 121. The mounting element 123 is movably disposed within the winding body 11. A first driving element is connected to the mounting element 123 and is used to drive the mounting element 123 to move along the length direction of the elastic element 122, to adjust the deformation of the spring, and / or to drive the elastic element 122 to move through the mounting element 123.

[0156] In some examples, the mounting member 123 is movable between a first position and a second position. The mounting member 123 in the first position is positioned closer to the clamping member 121 than the mounting member 123 in the second position. Specifically, when the mounting member 123 is in the first position, the elastic member 122 is configured to consistently push the clamping member 121 toward the clamping position. When the mounting member 123 is in the second position, the elastic member 122 can be in a free state without elastic deformation, or it can be in a deformed state, but in this case, the elastic member 122 consistently pushes the clamping member 121 toward the release position.

[0157] In some examples, the first driving element can be a structure such as an electric rod, a driving cylinder, or a driving motor.

[0158] In the above technical solution, by setting the mounting part 123 and the first driving part, the first driving part can drive one end of the elastic part 122 to move through the mounting part 123, so as to release the pushing force of the elastic part 122 on the clamping part 121 toward the clamping position. Thus, it is convenient to control the clamping mechanism 12 to release the diaphragm 1A, avoid the problem of poor needle removal of the feeding needle 70 due to the diaphragm 1A being clamped, and avoid the problem of the electrode being carried out and causing the electrode to move.

[0159] In some embodiments of this application, the clamping mechanism 12 further includes a second driving member connected to the clamping member 121 for driving the clamping member 121 to move toward the release position.

[0160] In some examples, the second driving element can be a structure such as an electric rod, a driving cylinder, or a driving motor.

[0161] In the above technical solution, by setting a second driving member, the clamping member 121 can be easily driven to release the starting end of the diaphragm 1A, which facilitates the unloading operation of the electrode assembly after winding is completed.

[0162] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the clamping member 121 is plate-shaped, and the opposite ends of the two clamping members 121 are provided with folded edges. In the clamping position, the folded edges of the two clamping members 121 extend along the depth direction of the groove 112 and abut against each other in the circumferential direction of the winding body 11.

[0163] It should be noted that when the clamping member 121 is plate-shaped, the end face of the two clamping members 121 facing each other is the surface of the clamping member 121 parallel to the thickness direction. The width of this end face is relatively narrow. When the two clamping members 121 move and abut against each other, if the two clamping members 121 have a certain offset in the depth direction of the groove 112, or if the two clamping members 121 move asynchronously, it is easy for the two clamping members 121 to fail to abut effectively, and thus fail to effectively clamp the diaphragm 1A.

[0164] In the above technical solution, by setting a folded edge at one of the opposite ends of the two clamping members 121, the two clamping members 121 can abut against each other through the folded edge, which can reduce the positional accuracy requirements of the two clamping members 121 when they abut, reduce the abutment difficulty of the two clamping members 121, and ensure that the two clamping members 121 can reliably and effectively clamp the diaphragm 1A.

[0165] In some embodiments of this application, such as Figures 15-17 and Figure 19 As shown, when the clamping member 121 is in the release position, it is arranged on one side of the groove 112 in the width direction, and when the clamping member 121 is in the clamping position, it presses against the other side wall of the groove 112.

[0166] For example, the groove 112 has a first sidewall and a second sidewall arranged opposite to each other in the circumferential direction of the wound body 11. When the groove 112 is an arc-shaped groove, the first sidewall and the second sidewall can be the portions of the inner wall of the groove 112 at both ends in the circumferential direction of the groove 112.

[0167] In some examples, the clamping member 121 is movably disposed on the winding body 11 along the width direction of the groove 112. The winding body 11 has a mounting cavity, and a connecting hole is formed on the first sidewall. The connecting hole connects the groove 112 and the mounting cavity. When the clamping member 121 is in the release position, the clamping member 121 can be completely located in the mounting cavity. A part of the clamping member 121 can also extend into the groove 112 through the connecting hole. However, the end of the clamping member 121 extending into the groove 112 is spaced apart from the second sidewall. When the clamping member 121 moves to the clamping position, the end of the clamping member 121 extending into the groove 112 abuts against the second sidewall of the groove 112 to clamp the starting end of the diaphragm 1A between the end of the clamping member 121 and the second sidewall of the groove 112.

[0168] In other examples, the clamping member 121 is rotatably disposed within the groove 112. When the clamping member 121 is in the released position, it is located within the mounting cavity of the winding body 11. Alternatively, the clamping member 121 is located within the groove 112 and is positioned close to the first sidewall of the groove 112. When the clamping member 121 rotates to the clamping position, the end of the clamping member 121 away from the pivot axis abuts against the second sidewall to press the diaphragm 1A between the clamping member 121 and the second sidewall. For example, when the clamping member 121 rotates from the released position to the clamping position, one end of the clamping member 121 can first rotate to the outside of the winding body 11 and the groove 112, and then rotate from the side where the opening of the groove 112 is located toward the bottom wall of the groove 112. This allows the diaphragm 1A to be pressed into the groove 112 first, and then abutted against the inner wall of the groove 112.

[0169] In the above technical solution, by arranging the clamping member 121 at the release position on one side of the groove 112 in the width direction, and making the clamping member 121 at the clamping position abut against the other side wall of the groove 112, the clamping member 121 can easily press the diaphragm 1A against the side wall of the groove 112, which facilitates the clamping member 121 to clamp and fix the diaphragm 1A, thereby improving the clamping efficiency and clamping reliability of the diaphragm 1A.

[0170] In some embodiments of this application, such as Figures 15-17 and Figure 19 As shown, the clamping mechanism 12 further includes a third driving member, which is connected to the clamping member 121 and is used to drive the clamping member 121 to move between the clamping position and the release position along the width direction of the groove 112.

[0171] In some examples, the third driving component can be a structure such as an electric rod, a driving cylinder, or a driving motor.

[0172] In the above technical solution, by setting a third driving component, the clamping component 121 can be easily driven to move between the clamping position and the release position, which facilitates the clamping and release operation of the diaphragm 1A, improves the clamping and release efficiency, and enhances the clamping reliability and release stability of the starting end of the diaphragm 1A.

[0173] In some embodiments of this application, such as Figures 15-17 and Figure 19 As shown, in the width direction of the groove 112, a plurality of first adsorption holes 113 are arranged on one side of the center line of the groove 112 perpendicular to the width direction.

[0174] In some examples, in the winding direction of the winding body 11, a plurality of first adsorption holes 113 are arranged on the sidewall of the downstream side of the groove 112.

[0175] For example, when the clamping member 121 is in the release position, the clamping member 121 and the plurality of first adsorption holes 113 are spaced apart in the width direction of the groove 112. When the winding body 11 rotates clockwise to wind the diaphragm 1A, the starting end of the diaphragm 1A is adsorbed at the position of the first adsorption hole 113. After the diaphragm 1A is wound around the circumference of the winding body 11 once, the diaphragm 1A can reach the position of the clamping member 121 in the release position.

[0176] In the above technical solution, by arranging multiple first adsorption holes 113 on one side of the groove 112 perpendicular to the center line of the width direction, the starting end of the diaphragm 1A can be easily sucked into the groove 112, and the diaphragm 1A can be attached to one side wall of the groove 112, thereby making it convenient for the clamping member 121 to press the diaphragm 1A against the inner wall of one side of the groove 112.

[0177] In some embodiments of this application, such as Figure 15 As shown, the winding body 11 includes two separate half rollers 114, which are symmetrically arranged about the central axis of the winding body 11, and at least one half roller 114 has a groove 112 formed on its circumferential surface.

[0178] In some examples, the two half-rollers 114 can be relatively movable along the mating direction of the two half-rollers 114, so that the two half-rollers 114 move closer to each other or further apart. There is a gap between the two half-rollers 114, and after the electrode assembly is wound, a part of the feeding clamp 70 can extend into the gap between the two half-rollers 114 to clamp the electrode assembly.

[0179] In some examples, grooves 112 may be provided on the circumferential surface of only one half-roller 114, or grooves 112 may be formed on the circumferential surfaces of both half-rollers 114. The gaps between the grooves 112 on the circumferential surface of the half-rollers 114 and the two half-rollers 114 are spaced apart in the circumferential direction of the winding body 11, meaning the gaps between the grooves 112 and the two half-rollers 114 are not connected. When grooves 112 are provided on both half-rollers 114, a clamping mechanism 12 may be provided at only one groove 112 location, or a clamping mechanism 12 may be provided at the groove 112 locations of both half-rollers 114. During the winding of the electrode assembly, only one clamping mechanism 12 may be used to clamp the starting end of the diaphragm 1A.

[0180] In the above technical solution, by making the winding body 11 include two separately arranged half rollers 114, a gap can be formed between the two half rollers 114, which facilitates the insertion of the unloading clamp 70 and facilitates the unloading of the wound electrode assembly from the winding body 11.

[0181] In some embodiments of this application, such as Figure 15As shown, in the circumferential direction of the wound body 11, the groove 112 is set close to the other half roller 114.

[0182] Specifically, the outer circumferential surface of the half roller 114 includes a winding area and a mating area. The winding area extends along the circumference of the half roller 114. The winding areas of the two half rollers 114 together constitute the winding surface 111 of the winding body 11. The mating area is connected to the two ends of the winding area in the circumferential direction of the winding body 11. The mating areas of the two half rollers 114 are arranged facing each other, and the mating areas of the two half rollers 114 cooperate to define a gap that facilitates the insertion of the feeding clamp needle 70.

[0183] The groove 112 of the half roller 114 is arranged in the winding area, and the groove 112 is spaced apart from the mating area. It should be noted that the groove 112 is arranged as close as possible to the mating area, or the groove 112 is arranged as close as possible to the winding area of ​​the other half roller 114. At the same time, the side wall of the groove 112 facing the mating area and the groove wall between the mating area also need to have sufficient thickness to ensure the structural strength of the half roller 114 at this position.

[0184] It should be noted that during the winding process, the starting end of the diaphragm 1A is clamped in the groove 112. After the diaphragm 1A is clamped, the electrode sheet can be fed in. Since the groove 112 is set close to the other half roller 114, the electrode sheet can be set closer to the edge of the half roller 114 when it is fed in. This can reduce the cutting of the electrode sheet, reduce electrode waste, and improve material utilization.

[0185] In the above technical solution, by setting the groove 112 close to the other half roller 114, the electrode sheet can be set closer to the edge of the half roller 114 when it is fed. This reduces the cutting of the electrode sheet, reduces electrode waste, and improves material utilization.

[0186] In some embodiments of this application, such as Figure 15 As shown, the groove 112 passes through both end faces of the winding body 11 in the axial direction, and the cross-section of the groove 112 is arc-shaped.

[0187] In some examples, the groove 112 is an arc-shaped groove, and further, the central angle corresponding to the inner wall of the groove 112 is less than or equal to 180°.

[0188] In the above technical solution, by making the groove 112 pass through both end faces of the winding body 11, the processing of the groove 112 can be facilitated, ensuring that the groove 112 can fully accommodate and clamp the diaphragm 1A. By making the cross-section of the groove 112 arc-shaped, the risk of local stress concentration in the winding body 11 can be reduced, and the service life of the winding body 11 can be improved.

[0189] In some embodiments of this application, an adsorption area is provided on the outer peripheral surface of the winding body 11. The adsorption area and the groove 112 are arranged at intervals in the circumferential direction of the winding body 11. The adsorption area is provided with a plurality of second adsorption holes. The winding body 11 is configured to generate adsorption force at the positions of the plurality of second adsorption holes so as to adsorb the diaphragm 1A onto the winding surface 111.

[0190] In some examples, the interior of the winding body 11 may be provided with a second negative pressure chamber, and multiple second adsorption holes are connected to the second negative pressure chamber. The second negative pressure chamber is used to provide negative pressure. The second negative pressure chamber can be connected to a vacuum device, which can extract the air in the second negative pressure chamber, so that negative pressure can be generated in the second negative pressure chamber. Since multiple second adsorption holes are connected to the second negative pressure chamber, adsorption force can be generated at multiple second adsorption hole positions on the winding surface 111 to adsorb and fix the diaphragm 1A and the electrode sheet on the winding surface 111.

[0191] In some examples, the number of second adsorption holes can be ten, twenty, thirty, forty, or more, and the shape of the second adsorption holes can be rectangular, circular, elongated, polygonal, or circular, elliptical, etc. The second adsorption holes can also be irregular in shape. Multiple second adsorption holes are arranged at intervals in the circumferential and axial directions of the wound body 11.

[0192] In the above technical solution, by setting multiple second adsorption holes on the outer peripheral surface of the winding body 11, the diaphragm 1A and the electrode can be adsorbed onto the winding surface 111 by vacuum adsorption, so that the diaphragm 1A and the electrode are firmly attached to the winding surface 111, further improving the stability of the diaphragm 1A fixation and reducing the risk of the diaphragm 1A slipping and wrinkling.

[0193] Secondly, embodiments of this application also provide a winding device 100, including the winding needle structure 10 of any of the above embodiments.

[0194] The winding apparatus 100 is used to wind the diaphragm 1A and the electrode sheets into an electrode assembly. The electrode sheets may include a positive electrode sheet 1B and a negative electrode sheet 1C. The electrode sheets can be continuous or piece by piece, for example... Figure 1 As shown, the positive electrode 1B is a continuous electrode, and the negative electrode 1C includes multiple electrodes arranged at intervals along the winding direction.

[0195] In the above technical solution, since the winding equipment 100 is provided with the above-mentioned winding needle structure 10, the winding needle structure 10 is provided with a recessed groove 112 on the winding surface 111, and a clamping mechanism 12 is provided to clamp the starting end of the diaphragm 1A in the groove 112. The clamping mechanism 12 can reliably fix the starting end of the diaphragm 1A in the groove 112. When the electrode sheet is fed in advance, the diaphragm 1A can be prevented from slipping or falling off, effectively preventing the problem of starting failure, thereby improving the winding efficiency of the winding equipment 100.

[0196] In some embodiments of this application, such as Figures 1-4 As shown, the winding equipment 100 also includes a turntable 20. The winding equipment 100 has a starting station 101, a winding station 102 and a unloading station 103 arranged sequentially along the rotation direction of the turntable 20. The needle winding structure 10 is rotatably mounted on the turntable 20. There are multiple needle winding structures 10, and the multiple needle winding structures 10 are arranged at intervals along the circumference of the turntable 20.

[0197] In some examples, the winding equipment 100 also includes a preparation station, and the preparation station, the starting station 101, the winding station 102 and the unloading station 103 are arranged in sequence along the rotation direction of the turntable 20.

[0198] In some examples, the number of needle winding structures 10 on the turntable 20 can be two, three, four, five, or more. Multiple needle winding structures 10 can correspond one-to-one with multiple processing stations of the winding equipment 100. In this way, each needle winding structure 10 can sequentially rotate through multiple processing stations to improve winding efficiency.

[0199] In the above technical solution, by setting up a turntable 20 and setting up multiple winding needle structures 10 on the turntable 20, and allowing the multiple winding needle structures 10 to flow sequentially between multiple processing stations, the production efficiency of the winding equipment 100 can be significantly improved.

[0200] In some embodiments of this application, such as Figures 1-4 As shown, the winding apparatus 100 also includes a top film mechanism 30, which is configured to push the diaphragm 1A into the groove 112.

[0201] In some examples, the top film mechanism 30 may have a top film element (e.g., a top piece 32 as described below), which is adapted to be arranged on the outer periphery of the winding body 11. The top piece 32 is used to push the diaphragm 1A on the outer side of the winding surface 111 into the groove 112 along the depth direction of the groove 112.

[0202] In other examples, the top membrane structure can be an adsorption mechanism that pushes the diaphragm 1A on the outside of the winding surface 111 into the groove 112 along the depth direction of the groove 112 by negative pressure adsorption. Additionally, the top membrane mechanism 30 can also have an air outlet facing the diaphragm 1A at the location of the groove 112, for blowing the diaphragm 1A on the outside of the winding surface 111 into the groove 112.

[0203] It should be noted that during the winding process, the diaphragm 1A is arranged on the outside of the winding surface 111 or attached to the winding surface 111. Since the groove 112 is recessed relative to the winding surface 111, the diaphragm 1A is not located inside the groove 112 at the starting end of the winding, but is arranged outside the groove 112. For the clamping mechanism 12 located in the winding body 11, it is not easy to clamp the diaphragm 1A located outside the groove.

[0204] In the above technical solution, by setting a top membrane mechanism 30 and using the top membrane mechanism 30 to push the diaphragm 1A into the groove 112, the clamping mechanism 12 can easily clamp the diaphragm 1A in the groove 112, reducing the clamping difficulty of the clamping mechanism 12 and simplifying the structure of the clamping mechanism 12.

[0205] Of course, in some examples, the clamping mechanism 12 can also be configured to extend into the groove 112 to clamp the diaphragm 1A on the outside of the winding surface 111, and then the clamping mechanism 12 can pull the starting end of the diaphragm 1A into the groove 112 and fix it in the groove 112.

[0206] In some embodiments of this application, such as Figures 1-4 As shown, the top film mechanism 30 includes a top film roller 31 and a top sheet 32. The top sheet 32 ​​is fixed to the top film roller 31 and extends radially outward along the top film roller 31. The top film roller 31 is in an initial position (e.g., Figure 3 and Figure 4 The location of the top film roller 31 shown) and the top film position (e.g.) Figure 1 and Figure 2 The top film roller 31 shown is movable between the positions of the top film roller 31 and the starting position 101. In the initial position, the top film roller 31 is away from the starting position 101. In the top film position, the top film roller 31 is close to the starting position 101, and the top sheet 32 ​​can extend into the groove 112 of the winding needle structure 10 located in the starting position 101.

[0207] In some examples, the top film mechanism 30 also includes a first support rod that is movable or telescopic along its length, and a top film roller 31 is rotatably arranged at one end of the first support rod. The first support rod is used to drive the top film roller 31 to move between an initial position and a top film position. When the top film roller 31 is in the initial position, it is arranged on the outer periphery of the turntable 20 and spaced apart from the periphery of the turntable 20 to avoid interference between the top film mechanism 30 and the turntable 20 or the winding needle structure 10 on the turntable 20. When the top film roller 31 is in the top film position, the end of the first support rod on which the top film roller 31 is located extends into the range of the turntable 20. The top film roller 31 is located close to the winding needle structure 10 at the starting position 101 and is arranged on the periphery of the winding needle structure 10. When it is necessary to push the diaphragm 1A into the groove 112, the top film roller 31 can be rotated so that the end of the top sheet 32 ​​away from the top film roller 31 pushes the diaphragm 1A outside the groove 112 into the groove 112 by rotation.

[0208] In some examples, when the top film mechanism 30 pushes the diaphragm 1A into the groove 112, the top film roller 31 and the winding body 11 can rotate at the same speed. Thus, the winding body 11 does not need to stop, and the top film mechanism 30 can also push the diaphragm 1A into the groove 112 without interfering with the winding body 11, thereby further improving the production efficiency of the winding equipment 100.

[0209] It should be noted that after the top film mechanism 30 pushes the starting end of the diaphragm 1A into the groove 112, the clamping mechanism 12 can clamp the diaphragm 1A. After the clamping mechanism 12 clamps the diaphragm 1A, the top plate 32 of the top film mechanism 30 can be moved out of the groove 112, and the top plate 32 will not pull the diaphragm 1A out of the groove 112 again.

[0210] In the above technical solution, by setting the top film roller 31 and the top sheet 32, the top film roller 31 can be moved to the top film position when it is necessary to push the diaphragm 1A into the groove 112, so as to facilitate pushing the starting end of the diaphragm 1A into the groove 112. When it is not necessary to push the diaphragm 1A, the top film roller 31 can be moved back to the initial position to avoid interference between the top film mechanism 30 and the winding needle structure 10 and the turntable 20.

[0211] In some embodiments of this application, such as Figures 1-4 As shown, the winding equipment 100 also includes a film cutting mechanism 40, which is arranged between the starting station 101 and the winding station 102 and is located near the winding needle structure 10 of the starting station 101. The film cutting mechanism 40 is used to cut the diaphragm 1A.

[0212] In this embodiment, by setting a film-cutting mechanism 40 between the starting station 101 and the winding station 102, and by positioning the film-cutting mechanism 40 close to the winding needle structure 10, the diaphragm 1A can be directly cut, shortening the conveying path and cutting response time of the diaphragm 1A, and avoiding the offset and wrinkling problems caused by excessively long conveying of the diaphragm 1A. The cutting action and the starting action of the winding needle structure 10 are more closely connected, reducing the process interval time and improving the continuous operation efficiency of the winding equipment 100. At the same time, the cutting length of the diaphragm 1A can be precisely controlled, avoiding material waste caused by cutting the diaphragm 1A too long or the risk of electrode exposure caused by cutting it too short, thus improving the consistency of the winding quality of the electrode assembly.

[0213] In some examples, the film cutting mechanism 40 includes a film cutting roller 41 and a cutter 42, the cutter 42 being fixed to the film cutting roller 41 and extending radially outward along the film cutting roller 41, the film cutting roller 41 being in a pre-position (e.g., Figure 4 The location of the cutting roller 41 shown) and the cutting position (e.g.) Figure 2 and Figure 3 The film cutting roller 41 shown is movable between the positions of the film cutting roller 41 and the position of the cutting roller 41. In the preparatory position, the film cutting roller 41 is away from the winding needle structure 10 of the winding station 101. In the cutting position, the film cutting roller 41 is close to the winding needle structure 10 of the winding station 101, and the cutter 42 can cut the diaphragm 1A on the winding surface 111 of the winding needle structure 10 of the winding station 101.

[0214] In some examples, the film cutting mechanism 40 further includes a second support rod that is movable or retractable along its length. A film cutting roller 41 is rotatably arranged at one end of the second support rod, which drives the film cutting roller 41 to move between a preparatory position and a cutting position. When the film cutting roller 41 is in the preparatory position, it is positioned close to the periphery of the turntable 20 to avoid interference between the film cutting mechanism 40 and the winding needle structure 10 on the turntable 20. When the film cutting roller 41 is in the cutting position, one end of the second support rod with the film cutting roller 41 extends towards the winding body 11 at the starting winding station 101, so that the film cutting roller 41 is close to the winding needle structure 10 at the starting winding station 101. The film cutting roller 41 is located on the periphery of the winding needle structure 10. When it is necessary to cut the diaphragm 1A, the film cutting roller 41 can be rotated, causing the cutter 42 to cut the diaphragm 1A by rotational cutting, thus disconnecting the diaphragm 1A at the winding station 102 and the starting winding station 101.

[0215] In some examples, the winding surface 111 is provided with a recessed cutting groove, and the film cutting mechanism 40 is configured to cut the diaphragm 1A at the location of the cutting groove. The groove 112 and the cutting groove can be arranged circumferentially spaced and adjacent to each other on the winding body 11, or the groove 112 can be formed as a cutting groove.

[0216] In some examples, when the film cutting mechanism 40 cuts the diaphragm 1A, the film cutting roller 41 and the winding body 11 can rotate at the same speed. Thus, the film cutting mechanism 40 can complete the cutting operation of the diaphragm 1A without the winding body 11 stopping, further improving the production efficiency of the winding equipment 100.

[0217] In the above technical solution, by setting up a film cutting mechanism 40 and arranging the film cutting mechanism 40 between the starting station 101 and the winding station 102 to cut the diaphragm 1A, the conveying path and cutting response time of the diaphragm 1A can be shortened, the process interval time can be reduced, the continuous operation efficiency of the winding equipment 100 can be improved, and the waste of diaphragm 1A material can also be reduced.

[0218] Thirdly, embodiments of this application also provide a method for winding an electrode assembly, which is applied to the winding apparatus 100 of any of the above embodiments.

[0219] like Figure 20 As shown, the winding method of this application embodiment includes: confirming that the diaphragm 1A covers the groove 112 of the winding needle structure 10 located at the starting winding station 101; causing the diaphragm 1A covering the groove 112 to enter the groove 112; the clamping mechanism 12 clamps the starting winding end of the diaphragm 1A in the groove 112; continuing to rotate the winding needle structure 10 until the diaphragm 1A and the electrode sheet are wound into an electrode assembly; the clamping mechanism 12 releases the starting winding end of the diaphragm 1A; and removing the wound electrode assembly from the winding needle structure 10.

[0220] In some examples, the winding needle structure 10 at the starting station 101 and the winding station 102 is always kept rotating relative to the turntable 20 to achieve the starting of winding of the diaphragm 1A and the winding of the diaphragm 1A and the electrode sheet.

[0221] In some examples, the starting station 101 is used to complete the starting process of the separator 1A and the electrode sheet, that is, to wind the starting end of the separator 1A and the starting end or starting sheet of the electrode sheet onto the winding needle structure 10. After the starting process of the separator 1A and the electrode sheet is completed, the turntable 20 can be rotated to transport the winding needle structure 10 together with the starting separator 1A and the electrode sheet to the winding station 102. At the winding station 102, the separator 1A and the electrode sheet are wound onto the winding needle structure 10 to form a wound electrode assembly, that is, a wound battery cell.

[0222] In the above technical solution, at the starting station 101, the diaphragm 1A is first placed over the groove 112 of the winding needle structure 10, and then the diaphragm 1A at the position of the groove 112 is fed into the groove 112. Then, the starting end of the diaphragm 1A is clamped in the groove 112 by the clamping mechanism 12. When the electrode sheet is fed in advance, the diaphragm 1A can be prevented from slipping or falling off, effectively preventing the problem of starting failure and improving winding efficiency and winding quality.

[0223] In some embodiments of this application, such as Figures 1-4 , Figures 20-21 As shown, the process of moving the diaphragm 1A covering the groove 112 into the groove 112 includes: driving the top film roller 31 of the top film mechanism 30 to rotate, the top film roller 31 driving the top plate 32 to rotate, the top plate 32 pushing the diaphragm 1A covering the groove 112 into the groove 112; the top film roller 31 driving the top plate 32 to push the diaphragm 1A between the two clamping members 121; and the top film roller 31 driving the top plate 32 to exit the groove 112.

[0224] In the above technical solution, the rotation of the top film roller 31 drives the rotation of the top sheet 32. The rotation of the top sheet 32 ​​pushes the diaphragm 1A into the groove 112, which can easily push the starting end of the diaphragm 1A into the groove 112, improve the efficiency of the starting end of the diaphragm 1A entering the groove 112, and the top film roller 31 and the top sheet 32 ​​of the top film mechanism 30 will not interfere with the winding needle structure 10.

[0225] In some embodiments of this application, the top film roller 31 rotates at the same speed but in the opposite direction to the winding needle structure 10.

[0226] For example, when it is necessary to push the diaphragm 1A into the groove 112, the needle winding structure 10 can rotate clockwise, and the top film roller 31 can rotate counterclockwise. Simultaneously, the linear velocity of the top film roller 31 is the same as the linear velocity of the needle winding structure 10. In this way, the needle winding structure 10 does not need to stop, and the top film mechanism 30 can also push the diaphragm 1A into the groove 112 without interfering with the needle winding structure 10, thereby further improving the production efficiency of the winding equipment 100.

[0227] In the above technical solution, by making the top film roller 31 rotate at the same speed and in the opposite direction to the winding needle structure 10, the winding needle structure 10 does not need to stop, and the top film mechanism 30 can push the diaphragm 1A into the groove 112, thereby improving the winding efficiency.

[0228] In some embodiments of this application, such as Figure 3 and Figure 21 As shown, after the clamping mechanism 12 clamps the starting end of the diaphragm 1A in the groove 112, the winding method further includes: the film cutting mechanism 40 cutting the diaphragm 1A located between the starting station 101 and the winding station 102. The cutting position of the film cutting mechanism 40 is located upstream of the groove 112 in the winding direction of the core structure.

[0229] In the above technical solution, after the clamping mechanism 12 clamps the starting end of the diaphragm 1A, the film cutting mechanism 40 cuts the diaphragm 1A between the starting station 101 and the winding station 102. Thus, the diaphragm 1A between the starting station 101 and the winding station 102 can be disconnected, which facilitates the starting of the diaphragm 1A at the starting station 101 and improves the connection efficiency between processes.

[0230] In some embodiments of this application, such as Figure 3 and Figure 21 As shown, the clamping mechanism 12 releases the starting end of the diaphragm 1A by driving two clamping members 121 to move from the clamping position toward the release position, so that the opposing ends of the two clamping members 121 separate to release the starting end of the diaphragm 1A.

[0231] In the above technical solution, by driving the two clamping members 121 to move toward the release position to release the starting end of the diaphragm 1A, the release efficiency of the clamping mechanism 12 to the starting end of the diaphragm 1A can be improved, the friction between the clamping member 121 and the starting end of the diaphragm 1A can be reduced, and the clamping mechanism 12 can be prevented from hindering the feeding of the electrode assembly.

[0232] In some embodiments of this application, such as Figure 11 , Figure 12 and Figure 22 As shown, the process of inserting the diaphragm 1A covering the groove 112 into the groove 112 includes: a film cutting mechanism 40 cutting the diaphragm 1A between the starting station 101 and the winding station 102 at the groove 112; and multiple first adsorption holes 113 in the groove 112 generating negative pressure to draw the starting end of the cut diaphragm 1A into the groove 112. For example, the multiple first adsorption holes 113 draw one end of the diaphragm 1A covering the needle structure 10 of the starting station 101 into the groove 112, and the diaphragm 1A connected to the winding station 102 is wound onto the needle structure 10 of the winding station 102.

[0233] In the above technical solution, by first cutting the diaphragm 1A, and then sucking the starting end of the diaphragm 1A into the groove 112 by negative pressure adsorption, the starting end can easily enter the groove 112 without the need to set up an additional top film mechanism 30, reducing the number of parts and creating a compact structure.

[0234] In some embodiments of this application, such as Figure 3 , Figure 4 and Figure 22As shown, the clamping mechanism 12 clamps the starting end of the diaphragm 1A in the groove 112, including: driving the clamping member 121 to move from the release position to the clamping position, and the clamping member 121 pressing the starting end of the diaphragm 1A against the inner wall of the groove 112. The clamping member 121 in the release position and a plurality of first adsorption holes 113 are arranged at intervals in the circumferential direction of the needle winding structure 10, and the clamping member 121 in the release position is arranged upstream of the plurality of first adsorption holes 113 in the rotation direction of the needle winding structure 10.

[0235] In the above technical solution, by arranging multiple first adsorption holes 113 on the downstream side of the clamping member 121 in the winding direction, and first adsorbing the starting end into the groove 112, and then pressing the starting end against the clamping member 121, the clamping member 121 will not block the multiple first adsorption holes 113 from sucking the starting end of the diaphragm 1A into the groove 112 when adsorbing the starting end. At the same time, the diaphragm 1A adsorbed in the groove 112 does not affect the clamping member 121 from moving to the clamping position, so that the clamping member 121 can effectively clamp the starting end of the diaphragm 1A and improve the clamping efficiency.

[0236] In some embodiments of this application, such as Figure 15 and Figure 16 As shown, before the clamping mechanism 12 releases the starting end of the diaphragm 1A, the winding method further includes: conveying the winding needle structure 10 to the unloading station 103; and inserting the unloading clamping needle 70 into the winding needle structure 10 and clamping the electrode assembly on the winding needle structure 10.

[0237] In other words, after the electrode assembly is wound, the winding needle structure 10 is first conveyed to the unloading station 103. At the unloading station 103, the unloading clamping needle 70 is first inserted into the gap between the two half rollers 114 of the winding needle structure 10, and then the formed electrode assembly is clamped by the unloading clamping needle 70. Next, the driving clamping member 121 is moved from the clamping position to the release position to release the starting end of the diaphragm 1A; then the two half rollers 114 are driven to move towards each other in the radial direction to shorten the gap between the two half rollers 114; finally, the electrode assembly and the unloading clamping needle 70 clamped on the electrode assembly are removed along the axial direction of the winding needle structure 10.

[0238] In the above technical solution, by first conveying the winding needle structure 10 to the unloading station 103, and then using the unloading clamping needle 70 to unload the electrode assembly on the winding needle structure 10, the winding efficiency of the winding equipment 100 can be improved, and the unloading process can be avoided from interfering with the winding of the electrode assembly at the winding station 102.

[0239] The following will refer to Figures 1-19 This application describes a winding apparatus 100 according to two specific embodiments.

[0240] Example 1, refer to Figures 1-9The winding equipment 100 includes: a turntable 20, four winding needle structures 10, a top film mechanism 30, a film cutting mechanism 40, a pressure roller 50, and a conveying roller 60. The winding equipment 100 may also include a feeding clamp 70 for feeding material.

[0241] Specifically, such as Figure 1 As shown, the turntable 20 is disc-shaped and rotatable around its central axis. Four winding needle structures 10 are spaced apart on the turntable 20, evenly distributed around its central axis, and each winding needle structure 10 is rotatable relative to the turntable 20. The winding equipment 100 has a preparation station, a starting station 101, a winding station 102, and a unloading station 103, all spaced apart around the central axis of the turntable 20. The top film mechanism 30, the film cutting mechanism 40, and the pressure roller 50 are all arranged close to the starting station 101 of the winding equipment 100. The number of conveying rollers 60 is multiple. The conveying rollers 60 are used to convey the diaphragm 1A and the electrode sheet. Specifically, multiple conveying rollers 60 are provided between the winding station 101 and the winding station 102. One or more conveying rollers 60 are also provided on the side of the winding station 101 near the preparation station.

[0242] like Figure 1 As shown, the top film mechanism 30 includes a first support rod, a top film roller 31, and a top sheet 32. The first support rod is telescopic along its length. The top film roller 31 is rotatably arranged at one end of the first support rod. The first support rod drives the top film roller 31 to move between an initial position and a top film position. The top sheet 32 ​​is fixed to the top film roller 31 and extends radially outward along the top film roller 31. The film cutting mechanism 40 includes a second support rod, a film cutting roller 41, and a cutter 42. The second support rod is telescopic along its length. The film cutting roller 41 is rotatably arranged at one end of the second support rod. The second support rod drives the film cutting roller 41 to move between a preparatory position and a cutting position. The cutter 42 is fixed to the film cutting roller 41 and extends radially outward along the film cutting roller 41. The winding equipment 100 also includes a third support rod, which is telescopic along its length. A pressure roller 50 is rotatably arranged at one end of the third support rod facing the winding needle structure 10 of the starting position 101.

[0243] like Figure 5 As shown, the winding needle structure 10 includes a winding body 11 and a clamping mechanism 12. The winding body 11 includes two separately arranged half rollers 114. The two half rollers 114 are symmetrically arranged about the central axis of the winding body 11. The two half rollers 114 can move relative to each other along the cooperation direction of the two half rollers 114 so that the two half rollers 114 are close to each other or far away from each other. A gap suitable for inserting the feeding needle 70 is formed between the two half rollers 114.

[0244] The outer surfaces of the two half-rollers 114 include a winding area and a mating area. The winding areas of the two half-rollers 114 together constitute the winding surface 111 of the winding body 11, and the mating areas of the two half-rollers 114 are arranged facing each other. Each winding area of ​​the two half-rollers 114 has a recessed groove 112. The grooves 112 on the two half-rollers 114 are arranged adjacent to each other. The grooves 112 extend through both ends of the winding body 11 along the axis of the winding body 11, and the cross-section of the grooves 112 is arc-shaped.

[0245] One of the half-rollers 114 is provided with a clamping mechanism 12, and the groove 112 on the other half-roller 114 without a clamping mechanism 12 is formed as a cutting groove.

[0246] like Figure 9 As shown, the clamping mechanism 12 includes two clamping members 121, two elastic members 122, two mounting members 123, and two first driving members. The two clamping members 121 extend along the axial direction of the winding body 11 and are arranged at intervals in the circumferential direction of the winding body 11. The opposite ends of the two clamping members 121 are rotatably connected to the groove wall at the opening position of the groove 112. The opposite ends of the two clamping members 121 extend obliquely towards the direction gradually approaching the central axis of the winding body 11. The two elastic members 122 are respectively connected between the two clamping members 121 and the two mounting members 123. The two first driving members are respectively connected to the two mounting members 123 and are used to drive the corresponding mounting members 123 to move along the length direction of the elastic member 122. The elastic member 122 is a spring.

[0247] The two half-rollers 114 are provided with a second negative pressure chamber inside, and an adsorption area is provided on the outer circumferential surface of the two half-rollers 114. The adsorption area and the groove 112 are arranged at intervals in the circumferential direction of the winding body 11. The adsorption area is provided with a plurality of second adsorption holes, and the plurality of second adsorption holes are all connected to the second negative pressure chamber. The winding body 11 is configured to generate adsorption force at the positions of the plurality of second adsorption holes so as to adsorb the diaphragm 1A onto the winding surface 111.

[0248] The following describes a method for winding an electrode assembly using the winding equipment described in Embodiment 1 of this application, such as... Figure 21 As shown.

[0249] The needle winding structure at the preparation station is transported to the starting station;

[0250] Confirm that the diaphragm covers the groove of the winding needle structure located at the winding station;

[0251] The top film roller of the driving top film mechanism rotates, which in turn drives the top sheet to rotate. The top sheet pushes the diaphragm covering the groove into the groove.

[0252] The top film roller drives the top sheet to push the diaphragm between the two clamping members, both of which are in the clamping position;

[0253] The top film roller continues to rotate, driving the top sheet out of the groove. At the same time, the two clamping pieces hold the starting end of the diaphragm in the groove.

[0254] The film cutting mechanism cuts the diaphragm located between the starting station and the winding station, wherein the cutting position of the diaphragm is located on the upstream side of the groove in the winding direction of the core structure;

[0255] The needle winding structure continues to rotate, completing the winding of the diaphragm and the electrode sheet, meaning that the diaphragm is wound around the needle winding structure at least once.

[0256] Rotate the turntable to transport the needle coil structure to the winding station;

[0257] The needle winding structure continues to rotate until the diaphragm and electrode sheet are wound into an electrode assembly;

[0258] Rotate the turntable to transport the needle coil structure to the unloading station;

[0259] Insert the feeding clamp into the coil needle structure and clamp the electrode assembly on the coil needle structure;

[0260] The two clamps move from the clamping position to the release position to release the starting end of the diaphragm;

[0261] The two half-rollers are driven to move towards each other in the radial direction, shortening the gap between the two half-rollers;

[0262] Remove the electrode assembly and the feeding clamping needle held on the electrode assembly along the axial direction of the needle coil structure.

[0263] The winding process of the winding equipment 100 according to Embodiment 1 of this application is described in detail below.

[0264] like Figure 1 As shown, rotating the turntable 20 positions a winding needle structure 10 at the starting position 101, and the pressure roller 50 presses down on the diaphragm 1A, so that the diaphragm 1A is close to the winding surface 111 of the winding body 11 at the starting position 101. The top film roller 31 of the top film mechanism 30 moves from the initial position to the top film position; as shown Figure 2 As shown, rotating the top film roller 31 causes the top sheet 32 ​​to push the diaphragm 1A outside the groove 112 between the two clamping members 121 inside the groove 112, with the two clamping members 121 holding the starting end of the diaphragm 1A; as Figure 3 As shown, the top film roller 31 returns from the top film position to the initial position, and the film cutting mechanism 40 cuts the diaphragm 1A at the cutting groove position using the cutter 42; as Figure 4 As shown, the needle winding structure 10 continues to rotate, and the pressure roller 50 can continue to press against the diaphragm 1A, or it can move away from the needle winding structure 10 and not press against the diaphragm 1A. The film cutting roller 41 of the film cutting mechanism 40 moves from the cutting position to the preparatory position.

[0265] Before the diaphragm 1A is cut by the cutter 42, the two clamping members 121 in the groove 112 clamp the starting end of the diaphragm 1A, and the two clamping members 121 are pushed by two springs to abut against each other to ensure that the two clamping members 121 are clamped together to have a reliable force to fix the starting end of the diaphragm 1A.

[0266] Furthermore, when the top film roller 31 rotates, it rotates at the same speed as the winding body 11. After the top sheet 32 ​​pushes the diaphragm 1A between the two clamping members 121, the frictional force between the diaphragm 1A and the two clamping members 121 is greater than the frictional force between the diaphragm 1A and the top sheet 32. Thus, when the top film roller 31 rotates with the winding body 11 and is pulled out from between the two clamping members 121, the two clamping members 121 can still hold the diaphragm 1A. This can fix the starting end of the diaphragm 1A before it is cut, thereby ensuring that the diaphragm 1A does not slip or the electrode does not fall off when the head of the electrode assembly is wound.

[0267] The following describes the material feeding process of the winding equipment 100 according to Embodiment 1 of this application.

[0268] like Figure 5 As shown, the turntable 20 rotates, rotating the coiled needle structure 10, which has been wound at the winding station 102, to the unloading station 103; as Figure 6 As shown, the feeding clamp 70 is inserted into the gap between the two half rollers 114, and the feeding clamp 70 clamps the electrode assembly; as shown Figure 7 As shown, the two clamping members 121 within the groove 112 move from the clamping position to the release position, loosening the starting end of the diaphragm 1A; as Figure 8 As shown, the two half-rollers 114 move toward each other, removing the electrode assembly along with the feeding clamp 70 from the winding body 11.

[0269] During the feeding process, the first driving component drives the mounting component 123 to move away from the clamping component 121 so that the spring retracts. In this way, after the feeding clamping needle 70 clamps the electrode assembly, the clamping mechanism 12 will no longer clamp the diaphragm 1A, thereby avoiding the diaphragm 1A from causing poor needle removal and avoiding the problem of the electrode being carried out and causing the electrode to move.

[0270] According to the winding device 100 of the present application embodiment, before the diaphragm 1A is cut, the starting end of the diaphragm 1A is fixed by the clamping mechanism 12, which can ensure that the diaphragm 1A does not slip or the electrode does not fall off when the electrode assembly is wound at the head.

[0271] Example 2, as Figures 10-19As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the clamping mechanism 12 in Embodiment 1 includes a clamping member 121, an elastic member 122, a mounting member 123, and a first driving member, while the clamping mechanism 12 in this embodiment 2 includes a clamping member 121 and a third driving member. The third driving member is connected to the clamping member 121 and is used to drive the clamping member 121 to move between the clamping position and the release position along the width direction of the groove 112. The groove 112 has a first sidewall and a second sidewall arranged opposite to each other. When the clamping member 121 is in the release position, it is arranged on the side where the first sidewall is located. When the clamping member 121 is in the clamping position, it abuts against the second sidewall and is adapted to press the starting end of the diaphragm 1A between the end of the clamping member 121 and the second sidewall.

[0272] Furthermore, the interior of the half roller 114 is provided with a first negative pressure chamber, and the inner wall of the groove 112 is provided with a plurality of first adsorption holes 113. The plurality of first adsorption holes 113 are all connected to the first negative pressure chamber, and the positions of the plurality of first adsorption holes 113 can generate adsorption force to adsorb and fix the starting end of the diaphragm 1A on the inner wall of the groove 112.

[0273] The following describes a method for winding an electrode assembly using the winding equipment described in Embodiment 2 of this application, such as... Figure 22 As shown.

[0274] The needle winding structure at the preparation station is transported to the starting station;

[0275] Confirm that the diaphragm covers the groove of the winding needle structure at the starting station, and confirm that the clamp is in the release position;

[0276] The film cutting mechanism cuts the diaphragm located between the starting station and the winding station at the groove position;

[0277] Multiple first adsorption holes in the groove generate negative pressure, which draws the starting end of the cut diaphragm into the groove.

[0278] The clamping member moves from the release position to the clamping position to clamp the starting end of the diaphragm between the inner wall of the groove and the clamping member;

[0279] The needle winding structure continues to rotate, completing the winding of the diaphragm and the electrode. The diaphragm is wound around the needle winding structure at least once to complete the winding.

[0280] Rotate the turntable to transport the needle coil structure to the winding station;

[0281] The needle winding structure continues to rotate until the diaphragm and electrode sheet are wound into an electrode assembly;

[0282] Rotate the turntable to transport the needle coil structure to the unloading station;

[0283] Insert the feeding clamp into the coil needle structure and clamp the electrode assembly on the coil needle structure;

[0284] The two clamps move from the clamping position to the release position to release the starting end of the diaphragm;

[0285] The two half-rollers are driven to move towards each other in the radial direction, shortening the gap between the two half-rollers;

[0286] Remove the electrode assembly and the feeding clamping needle held on the electrode assembly along the axial direction of the needle coil structure.

[0287] The following describes the winding process of the winding equipment 100 according to Embodiment 2 of this application.

[0288] like Figure 10 As shown, rotating the turntable 20 positions a winding needle structure 10 at the starting position 101, and the pressure roller 50 presses down on the diaphragm 1A so that the diaphragm 1A is close to the winding surface 111 of the winding body 11 at the starting position 101; Figure 11 As shown, confirm that the film cutting roller 41 of the film cutting mechanism 40 is in the cutting position, and the winding body 11 and the film cutting roller 41 rotate relative to each other, so that the cutter 42 cuts the diaphragm 1A at the groove 112 where the clamping member 121 is provided; as Figure 12 As shown, the membrane 1A is adsorbed into the groove 112 through the starting end of multiple second adsorption holes; as Figure 13 As shown, the drive clamp 121 moves from the release position to the clamping position, pressing the starting end of the diaphragm 1A against the inner wall of the groove 112; as Figure 14 As shown, the needle winding structure 10 continues to rotate, and the pressure roller 50 can continue to press against the diaphragm 1A, or it can move away from the needle winding structure 10 and not press against the diaphragm 1A. The film cutting roller 41 of the film cutting mechanism 40 moves from the cutting position to the preparatory position.

[0289] The following describes the material feeding process of the winding equipment 100 according to Embodiment 2 of this application.

[0290] like Figure 15 As shown, the turntable 20 rotates, rotating the coiled needle structure 10, which has been wound at the winding station 102, to the unloading station 103; as Figure 16 As shown, the feeding clamp 70 is inserted into the gap between the two half rollers 114, and the feeding clamp 70 clamps the electrode assembly; as shown Figure 17 As shown, the drive clamp 121 moves from the clamping position to the release position, releasing the starting end of the diaphragm 1A; as Figure 18 As shown, the two half-rollers 114 move toward each other, removing the electrode assembly along with the feeding clamp 70 from the winding body 11.

[0291] According to the winding device 100 of the present application embodiment, the starting end of the diaphragm 1A is fixed at the moment the diaphragm 1A is cut, which can ensure that the diaphragm 1A does not slip or the electrode does not fall off when the electrode assembly is wound at the head.

[0292] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding apparatus for winding a diaphragm (1A) and an electrode sheet into an electrode assembly, characterized in that, include: The turntable (20) and the winding equipment (100) have a starting station (101), a winding station (102) and a unloading station (103) arranged sequentially along the rotation direction of the turntable (20). A needle coiling structure (10) is rotatably mounted on the turntable (20). Multiple needle coiling structures (10) are arranged at circumferential intervals along the turntable (20). Each needle coiling structure (10) includes: A winding body (11) has an outer peripheral surface formed as a winding surface (111) and a recessed groove (112) is provided on the winding surface (111). A clamping mechanism (12) is disposed within the winding body (11) and is configured to clamp the starting end of the diaphragm (1A) within the groove (112). The inner wall of the groove (112) is provided with a plurality of first adsorption holes (113), and the winding body (11) is configured to generate adsorption force at the positions of the plurality of first adsorption holes (113) to adsorb the starting end onto the inner wall of the groove (112). The clamping mechanism (12) includes a clamping member (121) configured to be rotatable between a clamping position and a release position. In the clamping position, the clamping member (121) clamps and secures the starting end within the groove (112). In the release position, the clamping member (121) separates from the starting end, allowing the starting end to disengage from the groove (112). The clamping mechanism (12) includes two clamping members (121) arranged circumferentially on the wound body (11). When both clamping members (121) are in the clamping position, their opposing ends abut against each other to clamp the starting end. When at least one clamping member (121) is in the release position, the opposing ends of the two clamping members (121) separate. In the circumferential direction of the winding body (11), the opposite ends of the two clamping members (121) are rotatably connected to the winding body (11), and in the direction from both sides of the width direction of the groove (112) toward the middle of the groove (112), the two clamping members (121) extend obliquely toward the bottom wall of the groove (112). The top film mechanism (30) includes a first support rod, a top film roller (31), and a top sheet (32). The top film roller is rotatably arranged at one end of the first support rod. The top sheet (32) is fixed on the top film roller (31) and extends outward along the radial direction of the top film roller (31). The top film roller rotates to drive the top sheet into the groove (112) of the winding needle structure (10) located at the winding station (101) to push the diaphragm (1A) into the groove (112). When the top film mechanism (30) pushes the diaphragm (1A) into the groove (112), the top film roller (31) and the winding needle structure (10) rotate at the same speed but in opposite directions.

2. The winding equipment according to claim 1, characterized in that, The two clamping members (121) are arranged symmetrically in the width direction of the groove (112).

3. The winding equipment according to claim 1, characterized in that, The clamping mechanism (12) further includes: An elastic element (122) is connected between the clamping member (121) and the winding body (11), and the elastic element (122) is used to always push the clamping member (121) toward the clamping position.

4. The winding equipment according to claim 3, characterized in that, The clamping mechanism (12) further includes: a mounting member (123) and a first driving member. The mounting member (123) is fixed to the end of the elastic member (122) away from the clamping member (121). The first driving member is connected to the mounting member (123) and is used to drive the mounting member (123) to move along the length direction of the elastic member (122).

5. The winding equipment according to claim 1, characterized in that, The clamping mechanism (12) further includes a second driving member, which is connected to the clamping member (121) and is used to drive the clamping member (121) to move toward the release position.

6. The winding equipment according to claim 1, characterized in that, The clamping member (121) is plate-shaped, and the two clamping members (121) have folded edges at their opposite ends. At the clamping position, the folded edges of the two clamping members (121) extend along the depth direction of the groove (112) and abut against each other in the circumferential direction of the winding body (11).

7. The winding device according to claim 1, characterized in that, In the width direction of the groove (112), a plurality of the first adsorption holes (113) are arranged on one side of the center line of the groove (112) perpendicular to the width direction.

8. The winding apparatus according to any one of claims 1-7, characterized in that, The winding body (11) includes two separate half rollers (114), which are symmetrically arranged about the central axis of the winding body (11), and the groove (112) is formed on the circumferential surface of at least one half roller (114).

9. The winding equipment according to claim 8, characterized in that, In the circumferential direction of the wound body (11), the groove (112) is located close to another half roller (114).

10. The winding apparatus according to any one of claims 1-7, characterized in that, The groove (112) extends through both end faces of the winding body (11) in the axial direction, and the cross-section of the groove (112) is arc-shaped.

11. The winding apparatus according to any one of claims 1-7, characterized in that, The outer peripheral surface of the winding body (11) is provided with an adsorption area. The adsorption area and the groove (112) are arranged at intervals in the circumferential direction of the winding body (11). The adsorption area is provided with a plurality of second adsorption holes. The winding body (11) is configured to generate adsorption force at the positions of the plurality of second adsorption holes to adsorb the diaphragm (1A) onto the winding surface (111).

12. The winding apparatus according to claim 1, characterized in that, The top film roller (31) is movable between an initial position and a top film position, in which the top film roller (31) is away from the starting station (101), and in the top film position, the top film roller (31) is close to the starting station (101), and the top sheet (32) can extend into the groove (112) of the winding needle structure (10) located at the starting station (101).

13. The winding apparatus according to claim 1, characterized in that, The winding equipment (100) further includes a film cutting mechanism (40), which is arranged between the starting station (101) and the winding station (102) and is located near the winding needle structure (10) of the starting station (101). The film cutting mechanism (40) is used to cut the diaphragm (1A).

14. A method for winding an electrode assembly, characterized in that, The winding method is applied to the winding apparatus (100) according to any one of claims 1-13, the winding method comprising: Confirm that the diaphragm (1A) covers the groove (112) of the winding needle structure (10) located at the winding station (101); The diaphragm (1A) covering the groove (112) is brought into the groove (112); The clamping mechanism (12) clamps the starting end of the diaphragm (1A) in the groove (112); Continue rotating the coiled needle structure (10) until the diaphragm (1A) and the electrode sheet are wound into an electrode assembly; The clamping mechanism (12) releases the starting end of the diaphragm (1A); Remove the wound electrode assembly from the coiled needle structure (10).

15. The method for winding the electrode assembly according to claim 14, characterized in that, The step of inserting the diaphragm (1A) covering the groove (112) into the groove (112) includes: The top film roller (31) of the driving top film mechanism (30) rotates, and the top film roller (31) drives the top plate (32) to rotate. The top plate (32) pushes the diaphragm (1A) covering the groove (112) into the groove (112); The top film roller (31) drives the top sheet (32) to push the diaphragm (1A) between the two clamping members (121); The top film roller (31) drives the top sheet (32) out of the groove (112).

16. The method for winding the electrode assembly according to claim 15, characterized in that, After the clamping mechanism (12) clamps the starting end of the diaphragm (1A) in the groove (112), the winding method further includes: the film cutting mechanism (40) cutting the diaphragm (1A) located between the starting station (101) and the winding station (102).

17. The method for winding the electrode assembly according to claim 15, characterized in that, The clamping mechanism (12) releases the starting end of the diaphragm (1A) by driving the two clamping members (121) to move from the clamping position toward the release position, so that the opposing ends of the two clamping members (121) separate to release the starting end of the diaphragm (1A).

18. The method for winding the electrode assembly according to claim 14, characterized in that, The step of inserting the diaphragm (1A) covering the groove (112) into the groove (112) includes: The film cutting mechanism (40) cuts the diaphragm (1A) located between the starting station (101) and the winding station (102) at the groove (112) position; The multiple first adsorption holes (113) in the groove (112) generate negative pressure, which draws the starting end of the cut diaphragm (1A) into the groove (112).

19. The method for winding an electrode assembly according to claim 14, characterized in that, Before the clamping mechanism (12) releases the starting end of the diaphragm (1A), the winding method further includes: The needle coil structure (10) is conveyed to the unloading station (103); The feeding clamping needle (70) is inserted into the coiling needle structure (10) and clamps the electrode assembly on the coiling needle structure (10).

Images