Winding device, winding pin, and winding method

Abstract

The present application relates to a winding device, a winding pin, and a winding method. A winding device (100) comprises a base (20) and at least two winding pins (10). The base (20) has a winding position (21) and an ending position (22). The winding position (21) and the ending position (22) are each provided with a winding pin (10), and the winding pin (10) at the winding position (21) can exchange position with the winding pin (10) at the ending position (22). Each winding pin (10) comprises a main body part (11) and a first cutter assembly (12); the first cutter assembly (12) comprises first cutters (121) arranged inside the main body part (11); and the main body part (11) is configured to be capable of rotating circumferentially around its own axial direction relative to the first cutters (121), and the circumference of the main body part (11) is configured to be a winding surface (112) used for winding of a material (300) when the main body part rotates. The winding pin (10) located at the winding position (21) winds the head end of the material (300) on the winding surface (112), and exchanges position with the winding pin (10) located at the ending position (22) when the winding is completed. The first cutters (120) in the winding pin (10) at the winding position (21) after the exchange cut off the tail end located on the winding surface (112). In this way, the winding device (100) of the present application can switch the material (300) at the winding position (21), thereby shortening a feeding length and improving the production efficiency.

Description

Winding device, winding needle and winding method

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2023110233308, filed on August 15, 2023, entitled “Winding Device, Winding Needle and Winding Method,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a winding device, a winding needle, and a winding method. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] The battery cells contain electrode assemblies, which are primarily divided into wound and laminated types. Wound electrode assemblies consist of anode sheets, separators, and cathode sheets stacked in sequence and wound around a winding needle. After the wound electrode assembly is formed, a cutter cuts the anode, cathode, and separator sheets at the cutting position, completing the tail winding before the next winding cycle begins.

[0006] However, in the related art, the cutter is placed at a position far away from the winding needle, resulting in a long tail distance after cutting off the anode electrode, cathode electrode and diaphragm and the next winding cannot be carried out in time, affecting the production progress and production quality.

[0007] Summary of the Invention

[0008] In view of the above problems, the present application provides a winding device, a winding needle and a winding method.

[0009] In a first aspect, the present application provides a winding device comprising a base and at least two winding needles, wherein the base has a winding position and a tail position, and the base has a material feeding position at the winding position, and winding needles are provided at both the winding position and the tail position, and the winding needle at the winding position can be interchanged with the winding needle at the tail position. Each winding needle comprises a main body and a first cutter assembly, wherein the first cutter assembly comprises a first cutter disposed inside the main body, and the main body is configured to be able to rotate axially relative to the first cutter, and its outer periphery is configured as a winding surface for winding the material when it rotates. The winding needle at the winding position winds the head end of the material onto the winding surface, and after winding is completed, it interchanges with the winding needle at the tail position. The first cutter in the winding needle at the interchanged winding position cuts off the tail end located on the winding surface.

[0010] In this application, the two winding needles at the winding position and the tailing position are cut off from each other, and the first cutter of each winding needle is built into the main body. After the tail end of the material is cut off, the length of the tail material is the distance between the winding position and the tailing position. At this time, the tailing length can be shortened by appropriate position setting, and no external cutter is required for cutting.

[0011] Furthermore, since the winding needle that moves from the tail position to the winding position cuts off the tail end of the material at the winding position, when the winding needle at the next winding position starts winding, the head end of the material to be wound next time is still at the winding position, so that the head end of the material is closer to the winding needle at the winding position. At this time, the winding needle at the winding position can start winding quickly and conveniently without spending time and money on long-distance material transportation, thereby improving the production process.

[0012] In some embodiments, the first cutters include a plurality of first cutters, all of which are spaced apart in the main body and a first channel is formed between every two first cutters. The first cutters are used to cut the material in the adjacent first channels.

[0013] In the technical solution of the embodiment of the present application, by forming a first channel between adjacent first cutters, multiple materials can be controlled to be spaced apart in multiple first channels. When the winding needle is interchanged to the winding position, the first cutter cuts the material inside the winding needle at the winding position, thereby facilitating the next material and shortening the distance for re-feeding after the material is cut.

[0014] In some embodiments, each two adjacent first cutters are configured to be able to approach each other to cooperate in cutting off the material in the first channel therebetween.

[0015] In the technical solution of the embodiment of the present application, the material can be cut when the first cutters approach each other. After the tail end of the material is cut off, the first cutters at the winding position are controlled to move away from each other, and the main body of the winding needle at the tail position rotates to complete the material tailing.

[0016] In some embodiments, the main body has an end surface at one end in its axial direction, and the first cutter assembly is configured to be movable relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

[0017] In the technical solution of the embodiment of the present application, when the first cutter assembly is concealed within the main body, the material does not come into contact with the first cutter assembly. The main body is controlled to rotate and wind the material until the winding is complete and the material is transferred to the tail position. The first cutter assembly of the winding needle, which has been transferred from the tail position to the winding position, moves axially relative to the main body and partially protrudes from the end surface, contacting the material and forcing the material into the multiple first channels, allowing the cutter to cut the material in adjacent first channels.

[0018] In some embodiments, the first cutter assembly further includes a support member, which includes a plurality of clamping rollers. Each first cutter is provided with a clamping roller and each clamping roller extends axially along the main body. The support member extends radially out of the main body, and a second channel is formed between each two clamping rollers, which is connected to the first channel in a one-to-one manner.

[0019] In the technical solution of the embodiment of the present application, the support member is used to support the material entering the first channel. When the winding needle in the winding position completes winding and transfers to the tail position, the first cutter assembly that controls the winding needle moves axially relative to the main body and extends. At this time, multiple clamping rollers and multiple first cutters can extend axially out of the end face to separate the material at the tail end of the winding needle and provide support. Multiple materials are spaced apart in each second channel before entering the first channel.

[0020] In some embodiments, the winding position and the tailing position are radially opposite to each other along a circumference on the base.

[0021] In the technical solution of the embodiment of the present application, when the winding needle at the winding position and the winding needle at the tail position are located at the two ends of a set radial direction of the circular track, the first channel inside the winding needle at the winding position and the first channel inside the winding needle at the tail position are arranged opposite each other along the set radial direction.

[0022] In some embodiments, the winding device further includes a second cutter assembly, which is disposed on the base and located between the winding position and the tailing position.

[0023] In the technical solution of the embodiment of the present application, a second cutter assembly is provided. After the first cutter assembly cuts the anode electrode sheet and the cathode electrode sheet of the first material, the main body of the winding needle at the tailing position is opened to carry out tail winding until the tail of the anode electrode sheet and the cathode electrode sheet is completed and the diaphragm is wound separately. After winding a certain length, the diaphragm is cut by the separate control of the second cutter assembly to ensure the winding of the electrode assembly.

[0024] In some embodiments, the second cutter assembly includes an abutment member and a second cutter, and the abutment member and the second cutter are configured to be movable relative to the base so as to approach each other and cooperate to cut off the material therebetween.

[0025] In the technical solution of the embodiment of the present application, when the second cutter and the abutment member approach each other, the second cutter can abut the material clamped therebetween against the abutment surface and cut it.

[0026] In the second aspect, the present application provides a winding needle, comprising a main body and a first cutter assembly, the outer peripheral surface of the main body having a winding surface, the first cutter assembly comprising a plurality of first cutters, all of the first cutters being arranged in the main body and a first channel being formed between each adjacent two first cutters; wherein the main body is constructed to be rotatable around the axial circumference of the main body and to wind the material passing through the first channel onto the winding surface, and each first cutter is constructed to be able to cut off the material in the first channel adjacent to it.

[0027] In the technical solution of the embodiment of the present application, the cutter is built into the winding needle, so that the material can be cut inside the winding needle, which facilitates the end of the winding of the material and the start of the next winding, thereby improving production efficiency.

[0028] In some embodiments, the first cutter assembly further includes a support member, which includes a plurality of clamping rollers. Each first cutter is provided with a clamping roller and each clamping roller extends axially along the main body. The support member is provided outside the main body and a second channel is formed between each two clamping rollers, which is connected to the first channel in a one-to-one manner.

[0029] In the technical solution of the embodiment of the present application, the support member is used to support the material entering the first channel. When the winding needle in the winding position completes winding and transfers to the tail position, the first cutter assembly that controls the winding needle moves axially relative to the main body and extends. At this time, multiple clamping rollers and multiple first cutters can extend axially out of the end face to separate the material at the tail end of the winding needle and provide support. Multiple materials are spaced apart in each second channel before entering the first channel.

[0030] In some embodiments, each first cutter includes a clamping portion and a cutting portion; the clamping portions of every two adjacent first cutters are used to clamp the material in the first channel, and the cutting portions of every two adjacent first cutters are used to cut the clamped material.

[0031] In the technical solution of the embodiment of this application, the clamping portions of the two first cutters forming the first channel first abut against each other when approaching each other, clamping the material. Then, the cutting portion extends at the feed position to sever the clamped material. This arrangement simultaneously segments the material at the feed position while the tail end of the material roll on the winding needle at the tail position is clamped within the winding needle at the winding position, thus preventing the tail end from flying when the material is cut.

[0032] In some embodiments, the main body has an end surface at one end in its axial direction, and the first cutter assembly is configured to be movable relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

[0033] In the technical solution of the embodiment of the present application, when the first cutter assembly is hidden within the main body, the material does not come into contact with the first cutter assembly. When the first cutter assembly of the needle coil moves axially relative to the main body and partially protrudes from the end surface, it comes into contact with the material and forces the material into each of the multiple first channels, allowing the cutter to cut the material in the adjacent first channels.

[0034] In a second aspect, the present application provides a winding method, comprising the following steps:

[0035] The main body of the winding needle at the winding position is controlled to rotate around its own axial circumference to wind the head end of the material at the feeding position onto the winding surface of the outer periphery of the main body;

[0036] After the winding needle at the winding position completes the winding, the winding needle at the winding position is controlled to swap positions with the winding needle at the tailing position;

[0037] The first cutter of the winding needle which controls the winding position after the exchange cuts off the tail end of the material located on the winding surface.

[0038] In the technical solution of the embodiments of the present application, after the tail end of the material is cut, the length of the material being wound at the tail position is the distance between the winding position and the tail position. Appropriate settings can be used to shorten the distance between the winding position and the tail position, thereby shortening the tail length. Furthermore, after the winding needle has completed winding at the tail position and removed the material roll from it, it can return to an idle state, allowing it to cooperate with the winding needle at the winding position for the next time.

[0039] Moreover, since the winding needle currently moved to the winding position cuts off the tail end of the previous material roll at the feeding position, when the next winding starts, the head end of the material is still at the winding position. Therefore, the head end of the material is closer to the winding needle. At this time, the winding needle at the winding position can quickly and conveniently start winding the next material roll to improve the production process.

[0040] In some embodiments, the winding method further comprises:

[0041] The first cutter assembly of the winding needle at the end position after the exchange is controlled to move relative to the main body along the axial direction of the main body, and at least partially protrude from the end surface to space the materials in multiple first channels and multiple second channels of the first cutter assembly.

[0042] In the technical solution of the embodiment of the present application, the support member is used to support the material before entering the first channel. When the winding needle in the winding position completes winding and transfers to the tail position, the first cutter assembly of the winding needle is controlled to extend, and multiple clamping rollers can extend from the end face along the axial direction of the main body to separate the material at the tail end of the winding needle and provide support. At this time, multiple materials are spaced apart in each second channel and then extended into the first channel.

[0043] It can be understood that before the first cutter assembly of the winding needle in the tail position extends out of the end surface, the tail end material of the material on the winding surface of the winding needle extends along the tangential direction of the winding surface. After the first cutter assembly extends out of the end surface, it passes through multiple clamping rollers to change the extension direction of the tail end material so that it is spaced and arranged in parallel between the multiple clamping rollers.

[0044] In some embodiments, the winding method further comprises:

[0045] The first cutter assembly of the winding needle located at the winding position after the exchange is controlled to move relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

[0046] In the technical solution of the embodiment of the present application, when the first cutter assembly of the winding needle at the winding position is extended, the multiple materials supported by the multiple clamping rollers at the tailing position can naturally enter the first channel and the second channel of the winding needle at the winding position, thereby facilitating the cutting of the materials by the cutter at the winding position.

[0047] In some embodiments, cutting off the tail end of the material specifically includes:

[0048] Each two first cutters of the winding needle located at the winding position are controlled to approach each other so as to cooperate with each other to cut off the material in the first channel.

[0049] In the technical solution of the embodiment of the present application, the material can be cut off at the feeding position of the winding position to facilitate the next feeding and winding.

[0050] In some embodiments, after cutting off the tail end of the material, the method further includes:

[0051] The main body of the winding needle located at the tailing position is controlled to rotate around its own axis to wind the tail end of the material onto the winding surface.

[0052] In the technical solution of the embodiment of the present application, since the tail end of the material is cut at the winding position, the tail end distance can be shortened by reasonably designing the winding position and the tail end position of the base, thereby alleviating the winding failure phenomenon caused by the tail end distance being too long when the winding needle at the tail end position completes the material tail end.

[0053] Moreover, the winding needle located at the winding position can continue the winding process after completing the material cutting. At this time, the head end of the material is directly located at the winding position, thereby simplifying the production process and improving production efficiency.

[0054] In some embodiments, the winding method further comprises:

[0055] The first cutter assembly of the winding needle at the closing position is controlled to move relative to the main body along the axial direction of the main body into the main body.

[0056] In the technical solution of the embodiment of the present application, the tail end of the material supported by the support member returns to its original position to facilitate the subsequent winding needle to continue winding the tail end material, avoiding the situation where the main body needs to overcome the force of the support member when winding.

[0057] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the following descriptions are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on the drawings without inventive effort.

[0059] FIG1 is an exploded view of a battery cell according to one or more embodiments of the present application;

[0060] FIG2 is a structural diagram of an electrode assembly according to one or more embodiments of the present application;

[0061] FIG3 is a schematic plan view of a winding device according to one or more embodiments of the present invention in a first state;

[0062] FIG4 is a three-dimensional plan view of the structure of a winding needle according to one or more embodiments of the present application;

[0063] FIG5 is a planar structural diagram of a winding needle according to one or more embodiments of the present application;

[0064] FIG6 is a plan view of a winding device in another state according to one or more embodiments of the present application;

[0065] FIG7 is a schematic plan view of a winding device in a third state according to one or more embodiments of the present application;

[0066] FIG8 is a schematic plan view of a winding device in a fourth state according to one or more embodiments of the present application;

[0067] FIG9 is a schematic diagram of a first exemplary process of a winding method according to one or more embodiments of the present application;

[0068] FIG10 is a schematic diagram of a second exemplary process of a winding method according to one or more embodiments of the present application;

[0069] FIG11 is a schematic diagram of a third exemplary process of a winding method according to one or more embodiments of the present application;

[0070] FIG12 is a schematic diagram of a fourth exemplary process of a winding method according to one or more embodiments of the present application;

[0071] FIG13 is a schematic diagram of a fifth exemplary process of a winding method according to one or more embodiments of the present application;

[0072] FIG14 is a sixth exemplary flow chart of a winding method according to one or more embodiments of the present application.

[0073] 200, battery cell; 210, shell; 220, electrode assembly; 2201, anode plate; 2202, cathode plate; 2203, diaphragm; 230, end cap; 100, winding device; 10, winding needle; 11, main body; 111, end face; 112, winding surface; 12, first cutter assembly; 121, first cutter; 121a, clamping portion; 121b, cutting portion; 122, first channel; 123, support member; 1231, clamping roller; 1232, second channel; 20, base; 21, winding position; 22, ending position; 24, third position; 30, second cutter assembly; 31, abutment member; 32, second cutter; 300, material; 310, first material; 320, second material; L1, axial direction; L2, radial direction. DETAILED DESCRIPTION

[0074] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0076] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0077] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0078] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0079] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0080] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0081] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0082] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0083] An electrode assembly is installed inside a battery cell. The electrode assembly is a key energy-gathering part of the battery cell. During the processing of a wound electrode assembly, an anode sheet roller, a cathode sheet roller, and a diaphragm roller are required. The leading end of the anode sheet on the anode sheet roller, the leading end of the cathode sheet on the cathode sheet roller, and the leading end of the diaphragm on the diaphragm roller are stacked in sequence outside the winding needle. As the winding needle rotates, the anode sheet roller, cathode sheet roller, and diaphragm roller are peeled off and wound onto the winding needle to form the final electrode assembly.

[0084] After the winding of an electrode assembly is completed, the anode electrode sheet, cathode electrode sheet and diaphragm need to be cut off at the cutting position by a cutter and the tail winding is completed before the next winding can begin. However, in the existing winding equipment, the position of the cutter is far away from the winding needle, resulting in a long tail distance of the electrode assembly after the anode electrode sheet, cathode electrode sheet and diaphragm are cut off, which can easily cause the tail winding to not meet the requirements or cause the electrode sheet and diaphragm to be misaligned. In addition, when the next electrode assembly is wound after cutting, the head end of the anode electrode sheet, cathode electrode sheet and diaphragm is far away from the winding needle, and it is impossible to wind it in time, affecting the production progress.

[0085] Based on the above considerations, in order to solve the problem of the cutting position being too far away from the winding needle, which affects the production progress and production quality, the present application provides a winding device that can reduce the distance between the cutting position of the cutter and the winding needle, facilitate the tail winding of the previous electrode assembly and the winding and feeding of the next electrode assembly, thereby improving the production progress and production quality of the electrode assembly.

[0086] The winding device disclosed in the embodiment of the present application can be used in the battery production process to wind and form the electrode assembly, and can also be used in other production devices and processes to provide a winding preparation process for other materials.

[0087] As shown in Figure 1, specifically, the battery cell 200 includes a shell 210, an end cap 230, an electrode assembly 220, and other functional components. The shell 210 is a component used to form an internal environment of the battery cell 200. The formed internal environment can be used to accommodate the electrode assembly 220, electrolyte, and other components. The end cap 230 refers to a component that covers the opening of the shell 210 to isolate the internal environment of the battery cell 200 from the external environment. Without limitation, the shape of the end cap 230 can be adapted to the shape of the shell 210 to match the shell 210. The end cap 230 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 230 is not easily deformed when squeezed or collided, so that the battery cell 200 can have a higher structural strength.

[0088] The electrode assembly 220 is a component in the battery cell 200 where electrochemical reactions occur. One or more electrode assemblies 220 may be contained in the housing 210. As shown in Figure 2, the wound electrode assembly 220 is mainly formed by winding an anode electrode sheet 2201 and a cathode electrode sheet 2202 on a winding needle 10, and a separator 2203 is usually provided between the anode electrode sheet 2201 and the cathode electrode sheet 2202. The parts of the anode electrode sheet 2201 and the cathode electrode sheet 2202 with active materials constitute the main body of the electrode assembly 220, and the parts of the anode electrode sheet 2201 and the cathode electrode sheet 2202 without active materials each constitute a tab. The anode tab and the cathode tab may be located together in one section of the main body or respectively in two sections of the main body. During the charge and discharge process of the battery, the anode active material and the cathode active material react with the electrolyte, and the tabs connect the electrode segments to form a current loop.

[0089] According to some embodiments of the present application, referring to Figures 3 to 8, the present application provides a winding device 100, including a base 20 and at least two winding needles 10, the base 20 has a winding position 21 and a tail position 22, the winding position 21 and the tail position 22 are both provided with a winding needle 10, and the winding needle 10 at the winding position 21 can be interchanged with the winding needle 10 at the tail position 22.

[0090] Referring to Figures 3 to 5, each winding needle 10 includes a main body 11 and a first cutter assembly 12. The main body 11 has a winding surface 112 on its outer periphery. The first cutter assembly 12 includes a first cutter 121 arranged inside the main body 11. The main body 11 is constructed to be able to rotate around its own axial direction L1 relative to the first cutter 121, and its outer periphery is constructed as a winding surface 112 for winding materials when it rotates.

[0091] The winding needle 10 at the winding position 21 winds the leading end of the material 300 onto the winding surface 112. After winding is complete, it swaps positions with the winding needle 10 at the tailing position 22. After the swap, the first cutter 121 within the winding needle 10 at the winding position 21 cuts off the trailing end of the material 300 on the winding surface 112.

[0092] The base 20 refers to a structure that can provide an installation foundation for multiple winding needles 10. The winding position 21 refers to the workstation where the winding needle 10 can connect with the head end of the material 300 and gradually wind it onto the winding surface 112. The winding position 21 also refers to the workstation where the winding needle 10, which is swapped from the tail position 22 to the winding position 21, cuts the material 300 at the winding position 21.

[0093] The tail position 22 refers to the workstation where the winding needle 10 can move to the tail position 22 to complete the winding of the tail end of the material 300 to end the entire winding process after completing the winding process of the material 300 at the winding position 21. The tail position 22 also refers to the workstation used to carry the winding needle 10 in the idle process when the winding needle 10 at the winding position 21 is performing the winding process.

[0094] Winding needles 10 are provided at both the winding position 21 and the tailing position 22, and the winding needle 10 completes the setting work process at the winding position 21. At the same time, after the winding needle 10 at the tailing position 22 completes the setting work process at the tailing position 22, the two execute position swapping, transferring the winding needle 10 at the winding position 21 to the tailing position 22, and transferring the winding needle 10 at the tailing position 22 to the winding position 21.

[0095] The winding needle 10 refers to a mechanism that can be used to wind the material 300, and the main body 11 refers to a structure mainly used to wind the material 300. It has a winding surface 112 for directly contacting the material 300. When the head end of the material 300 is connected to the winding needle 10 at the winding position 21, as the main body 11 rotates, the head end of the material 300 can be wound on the winding surface 112 in circles.

[0096] It is understandable that the specific shape of the winding surface 112 determines the shape of the final material roll. For example, the winding surface 112 may be a closed circle or ellipse. In this case, the final material roll may be circular or elliptical, such as the electrode assembly 220.

[0097] After the winding of the material 300 is completed, the winding needle 10 can be separated from the material roll on its winding surface 112 through appropriate structural settings to facilitate the next winding of the winding needle 10.

[0098] Understandably, during the circumferential rotation of the main body 11, the first cutter 121 disposed within the main body 11 does not rotate synchronously with the main body 11. For example, with a winding needle 10 at the winding position 21 as the initial starting position, the main body 11 of the winding needle 10 is controlled to begin rotating, gradually stacking the leading end of the material 300 onto the winding surface 112 until the set number of turns have been completed. Stop the winding of the main body 11 and exchange the position of the winding needle 10 with the tail position 22. The winding needle 10 that has completed winding at the winding position 21 drives the material 300 thereon to move to the tail position 22. At this time, the winding needle 10 that is in an idle state at the tail position 22 moves to the winding position 21, cuts off the tail end of the material 300 on the winding surface 112 of the winding needle 10 at the tail position 22 at the winding position 21, starts the rotation of the main body 11 at the tail position 22, completes the winding of the material 300, and completes the winding of the winding needle 10 at the tail position 22.

[0099] In this way, the two winding needles 10 at the winding position 21 and the tailing position 22 are cut off from each other, and the first cutter 121 of each winding needle 10 is built into the main body 11. After the tail end of the material 300 is cut off, the length of the tail material 300 is the distance between the winding position 21 and the tailing position 22. At this time, the tailing length can be shortened by appropriate position setting, and no external cutter is required for cutting.

[0100] Furthermore, since the winding needle 10 that moves from the tail position 22 to the winding position 21 cuts off the tail end of the material 300 at the winding position 21, when the winding needle 10 at the winding position 21 starts winding for the next time, the head end of the material 300 to be wound for the next time is still located at the winding position 21, so that the head end of the material 300 is closer to the winding needle 10 at the winding position 21. At this time, the winding needle 10 at the winding position 21 can start winding conveniently and quickly, without spending time and cost on long-distance transportation of the material 300, thereby improving the production process.

[0101] Furthermore, the winding needle 10 that has completed winding at the tail position 22 can return to an idle state after unwinding the material 300 thereon, so as to cooperate with the winding needle 10 at the winding position 21 for the next time.

[0102] According to some embodiments of the present application, referring to Figures 3 to 5, each winding needle 10 includes a plurality of first cutters 121, all of the first cutters 121 are arranged at intervals in the main body 11, and a first channel 122 is formed between every two first cutters 121. The first cutter 121 is used to cut the material 300 in the first channel 122 adjacent to it.

[0103] It can be understood that a material roller may be provided on the outside of the winding device 100. After the head end of the material 300 on the material roller is pulled to connect with the winding needle 10 located at the winding position 21, as the main body 11 of the winding needle 10 rotates, the material 300 is gradually peeled off from the material roller. When the winding needle 10 located at the winding position 21 completes winding and moves to the tail position 22, the material 300 on the winding needle 10 is still connected to the external material roller and as the winding needle 10 moves, the material 300 extends from the winding position 21 to the tail position 22.

[0104] Afterwards, the winding needle 10 is controlled to move from the tailing position 22 to the winding position 21, and the material 300 is spaced apart in the first channel 122 between multiple first cutters 121. Through the action of each first cutter 121, the material 300 to be cut can be selectively cut in the first channel 122 of the winding position 21.

[0105] It can be understood that the winding needle 10 located at the winding position 21 has two processes, the winding process and the cutting process. During the winding process, as shown in Figure 6, the head end of the material 300 is continuously wound onto the winding surface 112. After the winding process is completed, the position is swapped to the tail position 22, as shown in Figure 3. At the same time, the winding needle 10 at the tail position 22 is swapped to the winding position 21 for the cutting process, that is, the winding process and the cutting process of forming a material roll do not occur on the same winding needle 10.

[0106] Similarly, the winding needle 10 at the tailing position 22 also has two processes, an idle process and a tailing process. When the winding needle 10 at the winding position 21 is in the winding process, the winding needle 10 at the tailing position 22 is in the idle process (that is, the winding needle 10 is not moving at this time); when the winding needle 10 at the winding position 21 is in the cutting process, the winding needle 10 at the tailing position 22 is in the tailing process.

[0107] If the winding needle 10 first placed in the winding position 21 is used as the first perspective, each winding needle 10 will first undergo the winding process at the winding position 21, and then the winding process at the closing position 22. From the perspective of the winding needle 10 first placed in the closing position 22, the winding needle 10 will first undergo the idle process at the closing position 22, and then the cutting process at the winding position 21, thus completing the coordination of the winding needles 10 in the two positions.

[0108] In this way, the winding needle 10 of the present application can control the spacing of multiple materials 300 in multiple first channels 122 by forming a first channel 122 between adjacent first cutters 121. When the winding needle 10 is interchanged to the winding position 21, the first cutter 121 cuts the material 300 inside the winding needle 10 at the winding position 21, thereby facilitating the next material 300 and shortening the distance for re-feeding after the material 300 is cut.

[0109] According to some embodiments of the present application, each two adjacent first cutters 121 are configured to be able to approach each other to cooperate in cutting the material 300 in the first channel 122 therebetween.

[0110] Specifically, a driving mechanism can be provided to drive the first cutter 121 to move relative to the main body 11 inside the main body 11, so as to move and cut the material 300 when it is necessary to cut the material 300, and ensure that the material 300 can extend from the first channel 122 along the extension direction of the first channel 122 when it is not necessary to cut the material 300.

[0111] Furthermore, along the extension direction of the first channel 122, as shown in Figure 5, each first cutter 121 includes a clamping portion 121a and a cutting portion 121b. The clamping portions 121a of the two first cutters 121 forming the first channel 122 first abut against each other when approaching each other, clamping the material 300, and then extend through the cutting portion 121b at the feeding position to cut off the clamped material 300.

[0112] With this arrangement, while the material 300 is being cut, the tail end of the material 300 on the winding needle 10 at the tailing position 22 is clamped inside the winding needle 10 at the winding position 21, thereby avoiding the tail end flying tape phenomenon when the tail end of the material 300 is cut.

[0113] After the tail end of the material 300 is cut off, the first cutter 121 at the winding position 21 is controlled to move away from each other, and the main body 11 of the winding needle 10 at the tailing position 22 rotates to complete the tailing of the material 300. At this time, the length of the tailed material 300 can be the distance between the two winding needles 10. In this way, the tail end tailing distance can be shortened by reasonably designing the winding position 21 and the tailing position 22 of the base 20, thereby alleviating the winding failure caused by the tailing distance being too long when the tailing of the material 300 is completed by the winding needle 10 at the tailing position 22, and avoiding the problem of the head and tail distance being too long caused by the external cutting structure.

[0114] Moreover, the winding needle 10 located at the winding position 21 can continue the next winding process after the cutting part 121b completes the cutting of the material 300. At this time, the head end of the material 300 is directly located at the winding position 21. It is only necessary to connect the head and tail of the material 300 with the main body 11 to wind it. There is no need to spend too much time to pull the head end of the material 300 to the winding position 21, thereby simplifying the production process and improving production efficiency.

[0115] According to some embodiments of the present application, referring to FIG. 4 , the main body 11 has an end surface 111 at one end in its own axial direction L1 , and the first cutter assembly 12 is configured to be movable relative to the main body 11 along the axial direction L1 of the main body 11 and at least partially protrude from the end surface 111 .

[0116] When the first cutter assembly 12 is hidden within the main body 11, the material 300 does not come into contact with the first cutter assembly 12. The main body 11 is controlled to rotate and wind the material 300 until the winding is completed and transferred to the end position 22. The first cutter assembly 12 of the winding needle 10, which has been transferred from the end position 22 to the winding position 21, moves relative to the main body 11 along the axial direction L1 of the main body 11 and partially protrudes from the end surface 111, making contact with the material 300 and forcing the material 300 into each of the multiple first channels 122, allowing the cutter assembly 12 to cut the material 300 in adjacent first channels 122.

[0117] Then, after the winding needle 10 at the winding position 21 cuts off the tail end of the material 300 , the first cutter assembly 12 can be controlled to retract and the next winding operation can be performed.

[0118] According to some embodiments of the present application, referring to Figures 3 to 4, the first cutter assembly 12 further includes a support member 123, the support member 123 includes a plurality of clamping rollers 1231, each first cutter 121 is provided with a clamping roller 1231 and each clamping roller 1231 extends along the axial direction L1 of the main body 11, the support member 123 extends out of the main body 11 along the radial direction L2 of the main body 11, and a second channel 1232 is formed between every two clamping rollers 1231 and is connected to the first channel 122 in a one-to-one correspondence.

[0119] The support member 123 is used to support the material 300 entering the first channel 122. When the winding needle 10 at the winding position 21 completes the winding process and moves to the tailing position 22, the first cutter assembly 12 of the winding needle 10 is controlled to move and extend along the axial direction L1 relative to the main body 11. At this time, multiple clamping rollers 1231 and multiple first cutters 121 can extend from the end surface 111 along the axial direction L1 to separate and support the material 300 at the tail end of the winding needle 10. Multiple materials 300 are spaced apart in each second channel 1232 before entering the first channel 122.

[0120] It can be understood that before the first cutter assembly 12 of the winding needle 10 at the tailing position 22 extends out of the end surface 111, the tail end material 300 of the material 300 on the winding surface 112 of the winding needle 10 extends along a certain tangential direction of the winding surface 112. After the first cutter assembly 12 extends out of the end surface 111, it changes the extension direction of the tail end material 300 through multiple clamping rollers 1231, so that it is spaced and arranged in parallel between the multiple clamping rollers 1231.

[0121] The winding needle 10 at the winding position 21 controls the first cutter assembly 12 to extend at this time, and the multiple materials 300 separated by the clamping roller 1231 at the tailing position 22 can naturally enter the first channel 122 and the second channel 1232 of the winding needle 10 at the winding position 21, thereby facilitating the subsequent selective cutting of each material 300.

[0122] According to some embodiments of the present application, the winding position 21 and the tailing position 22 are radially oppositely arranged along a circumference on the base 20 .

[0123] Specifically, a track, such as a circular track, can be set on the base 20, and the winding needle 10 at the winding position 21 and the winding needle 10 at the tailing position 22 are located at the radial ends of the circular track. By controlling the winding needle 10 to move along the circular track, position interchange is achieved.

[0124] When the winding needle 10 at the winding position 21 and the winding needle 10 at the tail position 22 are located at the two ends of a set radial direction of the circular track, the first channel 122 inside the winding needle 10 at the winding position 21 and the first channel 122 inside the winding needle 10 at the tail position 22 are arranged opposite to each other along the set radial direction.

[0125] After the winding needle 10 at the winding position 21 completes the winding process and pulls the material 300 from the winding position 21 to the tail position 22, the first cutter assembly 12 at the tail position 22 is controlled to extend radially along the main body 11. In the set radial direction, the support member 123 extends toward the side close to the winding position 21 to support and change the extension direction of the material 300, so that the material 300 extending along the tangential direction of the winding position 21 is supported to extend along the set radial direction, and then the first cutter assembly 12 at the position of the winding needle 10 is controlled to extend. Naturally, the material 300 can be accurately aligned with the first channel 122 between each two cutters, thereby being separated by the cutters.

[0126] According to some embodiments of the present application, referring to FIG. 3 and FIG. 6 to FIG. 8 , the winding device 100 further includes a second cutter assembly 30 . The second cutter assembly 30 is disposed on the base 20 and is located between the winding position 21 and the tailing position 22 .

[0127] Specifically, the second cutter assembly 30 is capable of cutting the material 300 between the winding position 21 and the finishing position 22, and the first cutter assembly 12 is capable of cutting the material 300 at the winding position 21. The second cutter assembly 30 is located between the winding position 21 and the finishing position 22, which means that it is located at a certain position on the movement path of the winding needle 10 when the winding needle 10, which has completed the winding process at the winding position 21, is transferred to the finishing position 22.

[0128] In one specific embodiment, the winding device 100 of the present application can be used to wind an electrode assembly 220. The anode electrode sheet 2201 and cathode electrode sheet 2202 of the electrode assembly 220 form a first material 310, and the separator 2203 forms a second material 320. The separator 2203 must first be wound around the beginning of the electrode assembly 220. After the separator 2203 is wound to a certain length, the anode electrode sheet 2201 and cathode electrode sheet 2202 are added to the winding. To finish the electrode assembly 220, the anode electrode sheet 2201 and cathode electrode sheet 2202 must first be cut off. After the winding is completed, the separator 2203 is wound to a certain length and then cut.

[0129] Therefore, the present application sets up a second cutter assembly 30. After the first cutter assembly 12 cuts the anode electrode 2201 and the cathode electrode 2202 of the first material 310, the main body 11 of the winding needle 10 at the tailing position 22 is opened to perform tail winding until the tail of the anode electrode 2201 and the cathode electrode 2202 are completed, and the diaphragm 2203 is wound separately. After winding a certain length, the diaphragm 2203 is cut off by the separate control of the second cutter assembly 30.

[0130] In other embodiments, the first cutter assembly 12 and the second cutter assembly 30 may be used in conjunction with each other to cut different first materials 310 and second materials 320 at different times and positions.

[0131] According to some embodiments of the present application, referring to Figures 3 and 6 to 8, the second cutter assembly 30 includes an abutment member 31 and a second cutter 32. The abutment member 31 and the second cutter 32 are constructed to be able to move relative to the base 20 to approach each other to cooperate in cutting the material therebetween.

[0132] The shape and size of the abutment 31 are not limited. It has an abutment surface directly facing the second cutter 32. When the second cutter 32 and the abutment 31 approach each other, the second cutter 32 can abut the material 300 clamped therebetween against the abutment surface and cut it.

[0133] Based on the same concept, referring to Figures 4 to 5, the present application also provides a winding needle 10 mentioned in any of the above embodiments, whose specific structure has been described in detail above and will not be repeated here. The winding needle 10 of the present application has the first cutter 121 built into the winding needle 10, so that the material 300 can be cut inside the winding needle 10, which facilitates the end winding of the material 300 and the start of the next winding, thereby improving production efficiency.

[0134] According to another aspect of the present application, a winding method is further provided, referring to FIG9 , which specifically includes the following steps:

[0135] S10 , controlling the main body 11 of the winding needle 10 located at the winding position 21 to rotate circumferentially around its own axial direction L1 to wind the head end of the material 300 at the feeding position onto the winding surface 112 on the outer periphery of the main body 11 .

[0136] Specifically, the process of step S10 is defined as a winding process. Each winding needle 10 includes a main body 11. The main body 11 refers to a structure mainly used to wind the material 300. It has a winding surface 112 for directly contacting the material 300. After the head end of the material 300 is connected to the winding needle 10 at the winding position 21, as the main body 11 rotates, the material 300 can be wound on the winding surface 112 in circles.

[0137] It is understandable that the specific shape of the winding surface 112 determines the shape of the final material roll 300. For example, the winding surface 112 may be a closed circle or an ellipse, in which case the final material roll 300 may be circular or elliptical.

[0138] S20, after the winding needle 10 at the winding position 21 has completed winding, the winding needle 10 at the winding position 21 and the winding needle 10 at the finishing position 22 are controlled to exchange positions;

[0139] Specifically, the process of step S20 is defined as a position exchange process. Before executing this step, it can be determined whether the winding process in step S10 has reached the set number of layers. If so, the winding process is considered to be completed and the position exchange process in this step is entered.

[0140] Winding needles 10 are provided at both the winding position 21 and the tailing position 22, and the winding needle 10 completes the winding process at the winding position 21. At the same time, the winding needle 10 and the winding needle 10 in the idle process at the tailing position 22 complete the position exchange, transferring the winding needle 10 at the winding position 21 to the tailing position 22, and transferring the winding needle 10 at the tailing position 22 to the winding position 21.

[0141] Furthermore, a track, such as a circular track, can be set on the base 20, and the winding needle 10 at the winding position 21 and the winding needle 10 at the tail position 22 are located at the radial ends of the circular track. By controlling the winding needle 10 to move along the circular track, position interchange is achieved, so that the winding needle 10 that completes the winding process at the winding position 21 is moved to the tail position 22, and when the winding needle 10 is at the winding position 21 for the winding process, the winding needle 10 at the tail position 22 is in the idle process.

[0142] S40, controlling the first cutter 121 of the winding needle 10 at the interchanged winding position 21 to cut off the tail end of the material 300 located on the winding surface 112;

[0143] Each winding needle 10 includes a main body 11 and a first cutter 121 located inside the main body 11 .

[0144] Specifically, the process of step S40 is defined as a cutting process. A first cutter 121 is built into the main body 11 to cut the tail end of the material 300 on the winding needle 10 at the tailing position 22 at the winding position 21. After the tail end is cut, the length of the material 300 being wound at the tailing position 22 is the distance between the winding position 21 and the tailing position 22. Through appropriate settings, the distance between the winding position 21 and the tailing position 22 can be shortened, thereby shortening the tail length. Furthermore, after the winding needle 10 at the tailing position 22 has finished winding, it can return to an idle state after unwinding the material 300, allowing it to cooperate with the winding needle 10 at the winding position 21 for the next time.

[0145] Moreover, since the winding needle 10 currently moved to the winding position 21 cuts off the tail end of the previous roll of material 300 at the winding position 21, when the next winding starts, the head end of the material 300 is still located at the winding position 21. Therefore, the head end of the material 300 is closer to the winding needle 10 at the winding position 21. At this time, the winding needle 10 located at the winding position 21 can quickly and conveniently start winding the next roll of material 300 to improve the production process.

[0146] According to some embodiments of the present application, referring to FIG. 10 , the following steps are further included before step S40:

[0147] Step S31, control the first cutter assembly 12 of the winding needle 10 located at the end position 22 after the exchange to move relative to the main body 11 along the axial direction L1 of the main body 11, and at least partially protrude from the end surface 111; so as to space the material 300 in the multiple first channels 122 and the multiple second channels 1232 of the first cutter assembly 12.

[0148] The end surface 111 is located at one end of the main body 11 in the axial direction L1 of the main body 11 , and the first channel 122 and the second channel 1232 are provided in a one-to-one correspondence.

[0149] Specifically, the first cutter assembly 12 also includes a plurality of first cutters 121, and the first cutters 121 include a plurality of first cutters 121, and the plurality of first cutters 121 are arranged at intervals in the main body 11 and a first channel 122 is formed between every two first cutters 121. The first cutter assembly 12 also includes a support member 123, and the support member 123 includes a plurality of clamping rollers 1231. Each first cutter 121 is provided with a clamping roller 1231 and each clamping roller 1231 extends along the axial direction L1 of the main body 11. The support member 123 is arranged outside the main body 11 along the radial direction L2 of the main body 11 and a second channel 1232 is formed between every two clamping rollers 1231, which is connected to the first channel 122 in a one-to-one correspondence.

[0150] The support member 123 is used to support the material 300 before it enters the first channel 122. When the winding needle 10 at the winding position 21 completes the winding process and moves to the tailing position 22, the first cutter assembly 12 of the winding needle 10 is controlled to extend. Multiple clamping rollers 1231 can extend from the end surface 111 along the axial direction L1 of the main body 11 to separate and support the material 300 at the tail end of the winding needle 10. At this time, multiple materials 300 are spaced apart in each second channel 1232 and then extend into the first channel 122.

[0151] It can be understood that before the first cutter assembly 12 of the winding needle 10 at the tailing position 22 extends out of the end surface 111, the tail end material 300 of the material 300 on the winding surface 112 of the winding needle 10 extends along the tangential direction of the winding surface 112. After the first cutter assembly 12 extends out of the end surface 111, it changes the extension direction of the tail end material 300 through multiple clamping rollers 1231, so that it is spaced and arranged in parallel between the multiple clamping rollers 1231.

[0152] According to some embodiments of the present application, referring to FIG. 11 , before step S40, the following steps are further included:

[0153] S32 , controlling the first cutter assembly 12 of the winding needle 10 located at the winding position 21 after the exchange to move relative to the main body 11 along the axial direction L1 of the main body 11 and at least partially protrude from the end surface 111 .

[0154] Specifically, when the winding needle 10 at the winding position 21 and the winding needle 10 at the finishing position 22 are located at opposite ends of a predetermined radial direction of the circular track, the first channel 122 within the winding needle 10 at the winding position 21 and the first channel 122 within the winding needle 10 at the finishing position 22 are arranged to face each other along the predetermined radial direction. When the first cutter assembly 12 of the winding needle 10 at the winding position 21 is extended, the plurality of materials 300 supported by the plurality of clamping rollers 1231 at the finishing position 22 can naturally enter the first channel 122 and the second channel 1232 of the winding needle 10 at the winding position 21, thereby facilitating the cutting of the materials 300 by the cutter at the winding position 21.

[0155] According to some embodiments of the present application, referring to FIG. 12 , step S40 specifically includes:

[0156] S41 , controlling each two adjacent first cutters 121 of the winding needle 10 located at the winding position 21 to move closer to each other and cooperate to cut the material 300 therebetween.

[0157] It can be understood that after step S32, all materials 300 are arranged at intervals in the first channels 122 of multiple winding needles 10. At this time, a driving mechanism can be set to drive the cutter to move relative to the main body 11 inside the main body 11, so as to move and cut the material 300 when it is necessary to cut the material 300, and ensure that the material 300 can pass through and out of the first channel 122 when it is not necessary to cut the material 300.

[0158] In this way, the winding method of the present application can complete the cutting of the material 300 inside the winding needle 10 to facilitate the next material feeding and winding.

[0159] According to some embodiments of the present application, referring to FIG. 13 , after step S40, the following steps are further included:

[0160] S60 , controlling the main body 11 of the winding needle 10 located at the tailing position 22 to rotate around its own axial direction L1 to wind the tail end of the material 300 onto the winding surface 112 .

[0161] After the tail end of the material 300 is cut off in step S40, the winding needle 10 at the winding position 21 completes the cutting process, and controls the winding needle 10 at the tail position 22 to restart the winding, so as to wind the tail end of the material 300 between the winding position 21 and the tail position 22 onto the winding surface 112. Since the tail end of the material 300 is cut at the winding position 21, the tail end distance can be shortened by reasonably designing the winding position 21 and the tail end position 22 of the base 20, thereby alleviating the winding unqualified phenomenon caused by the tail end distance being too long when the winding needle 10 at the tail end position 22 completes the tail end of the material 300.

[0162] Moreover, the winding needle 10 located at the winding position 21 can continue the winding process after completing the cutting of the material 300. At this time, the head end of the material 300 is directly located at the winding position 21, and the winding needle 10 on the winding position 21 can be directly wound without spending too much time pulling the material 300, thereby simplifying the production process and improving production efficiency.

[0163] According to some embodiments of the present application, referring to FIG. 14 , before step S60, the following steps are further included:

[0164] S50 , controlling the first cutter assembly 12 of the winding needle 10 located at the tail position 22 to move relative to the main body 11 along the axial direction L1 of the main body 11 into the main body 11 .

[0165] Specifically, the tail end of the material 300 supported by the support member 123 returns to its original position, so that the subsequent winding needle 10 can continue to wind the tail end material 300, thereby avoiding the situation where the main body 11 needs to overcome the force of the support member 123 when winding.

[0166] Other features of the winding needle 10 have been described in detail above and will not be repeated here.

[0167] According to some embodiments of the present application, referring to FIG. 1 to FIG. 13 , the present application provides a winding device 100 for winding an electrode assembly 220 . The winding device 100 includes a base 20 and two winding needles 10 . The specific working process is as follows:

[0168] 1) A winding needle 10 is provided at both the winding position 21 and the tailing position 22 of the base 20;

[0169] 2) After the leading ends of the anode electrode piece 2201, the separator 2203, and the cathode electrode piece 2202 are pulled to overlap and connect with the winding surface 112 of the winding needle 10 at the winding position 21, the main body 11 of the winding needle 10 is controlled to rotate along its own axial direction L1 to overlap and wind the leading ends of the anode electrode piece 2201, the separator 2203, and the cathode electrode piece 2202 onto the winding surface 112;

[0170] 3) The winding needle 10 that has completed the winding process at the winding position 21 is swapped with the winding needle 10 at the finishing position 22. During the movement, the winding needle 10 drives the anode electrode piece 2201, the cathode electrode piece 2202 and the separator 2203 from the winding position 21 to the finishing position 22.

[0171] 4) Control the first cutter assembly 12 of the winding needle 10 at the end position 22 to extend out of the end surface 111, and control the first cutter assembly 12 of the winding needle 10 at the winding position 21 to extend out of the end surface 111. At this time, the anode electrode piece 2201, the diaphragm 2203, and the cathode electrode piece 2202 pass through the second channel 1232 in the winding position 21 and the end position 22 respectively, and penetrate into the first channel 122;

[0172] 5) The first cutter 121 of the winding needle 10 at the winding position 21 moves within the main body 11 to cut the anode electrode piece 2201 and the cathode electrode piece 2202 within the first channel 122;

[0173] 6) Controlling the first cutter assembly 12 of the winding needle 10 at the tailing position 22 to be retracted into the main body 11 and controlling the main body 11 to rotate along the axial direction L1 of the main body 11 to complete the winding of the tail ends of the anode electrode piece 2201 and the cathode electrode piece 2202;

[0174] 7) The second cutter assembly 30 located between the winding position 21 and the tailing position 22 is controlled to operate to cut the diaphragm 2203 , and the tail end of the diaphragm 2203 is wound up by the circumferential rotation of the main body 11 at the tailing position 22 .

[0175] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0176] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A winding device, wherein: The winding device comprises: a base having a winding position and a winding position; and At least two winding needles, the winding position and the tail position are both provided with the winding needles, and the winding needles at the winding position can be interchanged with the winding needles at the tail position; Each of the winding needles comprises a main body and a first cutter assembly, wherein the first cutter assembly comprises a first cutter arranged inside the main body; the main body is configured to be able to rotate around its own axial circumference relative to the first cutter, and its outer circumference is configured as a winding surface for winding materials when the main body rotates; Among them, the winding needle located at the winding position rolls the leading end of the material onto the winding surface, and after the winding is completed, it exchanges positions with the winding needle located at the tailing position; the first cutter in the winding needle at the winding position after the exchange cuts off the tail end of the material located on the winding surface.

2. The winding device according to claim 1, wherein: Each of the winding needles includes a plurality of first cutters, all of which are arranged at intervals in the main body and a first channel is formed between every two first cutters; Wherein, the first cutter is used to cut off the material in the first channel adjacent thereto.

3. The winding device according to claim 2, wherein: Each adjacent two first cutters are configured to be able to approach each other to cooperate in cutting off the material in the first channel therebetween.

4. The winding device according to claim 2, wherein: The main body has an end surface at one end in the axial direction thereof, and the first cutter assembly is configured to be movable relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

5. The winding device according to claim 2, wherein: The first cutter assembly further includes a support member, the support member includes a plurality of clamping rollers, each of the first cutters is provided with the clamping roller and each of the clamping rollers extends along the axial direction of the main body; The support member extends out of the main body along the radial direction of the main body, and a second channel connected to the first channel in a one-to-one correspondence is formed between every two clamping rollers.

6. The winding device according to any one of claims 1 to 5, wherein: The winding position and the tailing position are arranged radially opposite to each other along a circumference on the base.

7. The winding device according to any one of claims 1 to 5, wherein: The winding device further comprises a second cutter assembly, which is disposed on the base and is located between the winding position and the tailing position; The second cutter assembly is used for cutting the material between the winding position and the tailing position.

8. The winding device according to claim 7, wherein: The second cutter assembly includes an abutment member and a second cutter. The abutment member and the second cutter are configured to be movable relative to a base so as to approach each other and cooperate to cut off the material therebetween.

9. A needle curling device, wherein: The winding needle comprises: The main body has a rolling surface on its outer periphery; A first cutting knife assembly includes a plurality of first cutting knives, all of which are arranged in the main body and a first channel is formed between every two adjacent first cutting knives; The main body is configured to be rotatable around its own axial circle and to roll the material onto the rolling surface when rotating. Each of the first cutters is configured to be able to cut off the material in the first channel adjacent thereto.

10. The winding device according to claim 9, wherein: The first cutter assembly further includes a support member, the support member includes a plurality of clamping rollers, each of the first cutters is provided with the clamping roller and each of the clamping rollers extends along the axial direction of the main body; The support member is arranged outside the main body and a second channel connected to the first channel in a one-to-one correspondence is formed between every two clamping rollers.

11. The winding device according to claim 10, wherein: Each adjacent two first cutters are configured to be able to approach each other to cooperate in cutting off the material in the first channel therebetween.

12. The winding needle according to claim 11, wherein: Each of the first cutters includes a clamping portion and a cutting portion; The clamping parts of each two adjacent first cutters are used to clamp the material in the first channel; The cutting parts of each two adjacent first cutters are used to cut off the clamped material.

13. The winding needle according to any one of claims 10 to 11, wherein: The main body has an end surface at one end in the axial direction thereof, and the first cutter assembly is configured to be movable relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

14. A winding method, wherein: The winding method comprises the following steps: The main body of the winding needle for controlling the winding position rotates around its own axial direction to wind the head end of the material onto the winding surface on the outer periphery of the main body; After the winding needle at the winding position completes the winding, the winding needle at the winding position is controlled to exchange positions with the winding needle at the winding end position; The first cutter in the winding needle controls the winding position after the exchange to cut off the tail end of the material located on the winding surface; Each of the rolling needles includes the main body and the first cutting knife located inside the main body.

15. The winding method according to claim 14, wherein: Before the step of controlling the first cutter in the winding needle of the winding position after the exchange to cut off the tail end of the material located on the winding surface, the following steps are also included: Control the first cutter assembly of the winding needle located at the end position after the exchange to move relative to the main body along the axial direction of the main body and at least partially protrude from the end surface so as to space the materials in the multiple first channels and the multiple second channels of the first cutter assembly; The end surface is located at one end of the main body in the axial direction of the main body, and the first channel and the second channel The channels are set one by one.

16. The winding method according to claim 15, wherein: Before the step of controlling the first cutter in the winding needle of the winding position after the exchange to cut off the tail end of the material located on the winding surface, the following steps are also included: The first cutter assembly of the winding needle located at the winding position after the exchange is controlled to move relative to the main body along the axial direction of the main body and at least partially protrude from the end surface.

17. The winding method according to claim 16, wherein: The step of controlling the first cutter in the winding needle at the winding position after the exchange to cut off the tail end of the material located on the winding surface specifically includes: Each adjacent two first cutters of the winding needle located at the winding position are controlled to approach each other so as to cooperate and exchange materials therebetween.

18. The winding method according to claim 17, wherein: After the step of controlling the first cutter in the winding needle at the winding position after the exchange to cut off the tail end of the material located on the winding surface, the step further includes: The main body of the winding needle located at the tailing position is controlled to rotate around its own axis so as to wind the tail end of the material onto the winding surface.

19. The winding method according to claim 18, wherein: Before the step of controlling the main body of the winding needle located at the tailing position to rotate around its own axis to wind the tail end of the material onto the winding surface, the step further includes: The first cutter assembly of the winding needle at the closing position is controlled to move relative to the main body along the axial direction of the main body into the main body.

Images