A winding device and winding method

Abstract

This invention relates to the field of battery cell processing technology, and discloses a winding device and winding method. The winding device includes a winding needle, a film pushing assembly, and a clamping assembly. The film pushing assembly can be driven to reciprocate along the radial direction of the winding needle, and includes a heat-bonding part for heat-bonding two or more layers of the workpiece to be wound, and a cutting part for cutting the workpiece to be wound. The clamping assembly is disposed on the side of the winding needle and includes two clamping members. The clamping members can be driven to abut against the outer peripheral surface of the winding needle to fix the workpiece to be wound during the cutting action. By integrating the heat-bonding part and the cutting part at the extension end of the film pushing assembly, the core actions are all completed collaboratively in one radial reciprocating stroke of the film pushing assembly, simplifying the equipment structure and effectively avoiding the tension relaxation or positional displacement of the film material caused by station switching in traditional technologies, ensuring the neatness of the film material end, and ensuring the quality of the battery cell from the source.

Description

Technical Field

[0001] This invention relates to the field of battery cell processing technology, and in particular to a winding device and winding method. Background Technology

[0002] In the production process of lithium-ion batteries and other battery cells, winding is one of the core processes. Traditional winding equipment usually needs to complete a series of preparatory actions before starting winding, such as pushing the film material in, sealing multiple layers of film material (such as hot pressing of the separator), and cutting the film material.

[0003] However, existing winding equipment typically places the film pushing, sealing, and cutting mechanisms in separate stations or controls them with different drive mechanisms. This requires multiple independent mechanisms to be arranged around the winding needle, resulting in congestion at the winding head of the needle. This not only increases the size of the equipment but also makes subsequent maintenance and debugging inconvenient. Furthermore, during the switching between different mechanisms, the film material is prone to tension fluctuations, leading to inaccurate working positions. This can affect the neatness of the battery cell winding ends or even cause internal damage to the battery cell. Therefore, improvements to the existing technology are necessary. Summary of the Invention

[0004] This invention provides a winding device and a winding method to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A winding device, comprising:

[0007] A coiled needle, wherein the outer peripheral surface of the coiled needle is provided with an inwardly recessed receiving recess;

[0008] The film pushing assembly is driven to reciprocate along the radial direction of the winding needle, and includes an insertion end for extending into the receiving recess as the film pushing assembly moves. The insertion end is provided with a heat-bonding part for heat-bonding two or more layers of the workpiece to be wound, and a cutting part for cutting the workpiece to be wound.

[0009] A clamping assembly is disposed on the side of the winding needle. The clamping assembly includes two clamping members that can be driven to abut against the outer peripheral surface of the winding needle to fix the workpiece to be wound in the processing position.

[0010] Optionally, it also includes an end fixing device, disposed on the inner wall of the receiving recess, for fixing the film end adsorption device formed after the part to be wound is cut.

[0011] Optionally, the end fixing device includes an adsorption device, which includes an adsorption channel located inside the needle winding, and the adsorption channel has a physical interface for connecting a negative pressure source; the adsorption device also includes a plurality of adsorption holes located on the inner wall of the receiving recess, and the plurality of adsorption holes are all connected to the adsorption channel.

[0012] Optionally, the film-pushing assembly includes a push rod for connecting the film-pushing drive, and both the heat-sealing portion and the cutting portion are fixed to the push rod.

[0013] Optionally, the heat-sealing part includes a heating device disposed at the end of the film-pushing assembly, the heating device being configured to heat-seale multiple layers of the workpiece to be wound together by hot pressing.

[0014] Optionally, the cutting section includes an electrothermal cutting wire or a laser emitting head disposed at the end of the push rod.

[0015] Optionally, the coiling needle includes a first half-needle and a second half-needle disposed opposite each other, with the receiving recess formed between the first half-needle and the second half-needle.

[0016] Optionally, the first half-needle and the second half-needle are movably connected;

[0017] The winding device further includes an adjustment drive mechanism, which includes a drive end connected to the first half needle and / or the second half needle for driving the first half needle and the second half needle to move closer or further apart in the radial direction.

[0018] Optionally, the pressing assembly includes two movable pressure rollers, which are respectively disposed on both sides of the film pushing assembly and are used to abut against both sides of the cutting position of the workpiece to be wound.

[0019] The present invention also provides a winding method, implemented based on the winding apparatus as described in any of the preceding claims, comprising:

[0020] Drive the film pushing assembly to move radially, push the part to be wound into the receiving recess and tension it;

[0021] The drive clamping assembly holds the workpiece to be wound against the outer periphery of the winding needle;

[0022] The hot-pressing section heats the multiple layers of the workpiece to be wound together, and the cutting section cuts the heat-pressed workpiece. Compared with the prior art, the present invention has the following advantages:

[0023] This invention provides a winding device and method that integrates both a heat-sealing part and a cutting part at the insertion end of the film-pushing assembly. This allows the three core actions of pushing, sealing, and cutting to be completed collaboratively within a single radial reciprocating stroke of the film-pushing assembly, greatly simplifying the mechanical structure of the winding head and reducing the space occupied by the equipment. Furthermore, after the film material is pushed into the receiving recess, the sealing and cutting actions are performed compactly at the same position, effectively avoiding the tension relaxation or positional shift of the film material caused by station switching in traditional technologies. This ensures the neatness of the film material ends and guarantees the quality of the battery cell from the source.

[0024] The present invention has other features and advantages, which will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of a winding device provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a film pushing assembly in a winding device provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of a winding device provided in an embodiment of the present invention when both the film pushing assembly and the pressing assembly are in their initial positions;

[0029] Figure 4 This is a schematic diagram of the structure of a film pushing assembly entering a receiving recess in a winding device according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a winding device provided in an embodiment of the present invention after the pressing component performs pressing and the cutting part performs cutting;

[0031] Figure 6 This is a schematic diagram of the structure of a winding device in which the adsorption device adsorbs and fixes the end of the film material according to an embodiment of the present invention;

[0032] Figure 7This is a schematic diagram of the structure of the film pushing assembly and the pressing assembly after resetting in a winding device according to an embodiment of the present invention.

[0033] Reference numerals: 10, winding needle; 11, first half needle; 12, second half needle; 13, receiving recess; 20, film pushing assembly; 21, heat sealing part; 22, cutting part; 31, suction hole; 40, adjustment drive mechanism; 50, pressing assembly; 51, pressing element; 60, part to be wound; 61, diaphragm; 62, electrode sheet. Detailed Implementation

[0034] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0035] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0036] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0037] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0038] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0039] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0040] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0041] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] Please refer to Figure 1This invention provides a winding device, including a winding needle 10, a film pushing assembly 20, and a pressing assembly 50. Specifically, the part to be wound 60 is a separator 61, an electrode 62, or a combination of separator 61 and electrode 62 for battery cell winding. For example, the part to be wound 60 consists of two separators 61. During the winding process where the winding needle 10 drives the two separators 61 to rotate, the electrode 62 is conveyed to the position of the winding needle 10 by an external electrode feeding mechanism, and is clamped between the two separators 61 and wound synchronously with the winding action of the separators 61, so that the electrode 62 and the separator 61 form a stacked winding structure according to the battery cell design requirements, and finally obtain a battery cell core.

[0044] The winding needle 10, as the core execution component for winding, has an inwardly recessed receiving recess 13. This receiving recess 13 not only serves as a space for the workpiece 60 to be wound to enter and reset, but also provides physical clearance for subsequent processing operations.

[0045] Please refer to Figure 2 The film pushing assembly 20 can be driven to reciprocate along the radial direction of the winding needle 10. It includes an insertion end for extending into the receiving recess 13 as the film pushing assembly 20 moves. The insertion end is provided with a heat-sealing part 21 and a cutting part 22. The heat-sealing part 21 is used to heat-seale two or more layers of the workpiece 60 to be wound, and the cutting part 22 is used to cut the workpiece 60 to be wound.

[0046] The clamping assembly 50 is located on the side of the winding needle 10 and includes two clamping members 51. The clamping members 51 can be driven to move to abut against the outer peripheral surface of the winding needle 10 to fix the part to be wound 60 in the processing position, so as to prevent displacement during the hot-pressing and cutting process and thus effectively ensure the processing quality of the battery cell.

[0047] It is understood that in this embodiment, the film pushing assembly 20 not only performs a single pushing action, but also integrates the heat sealing part 21 and the cutting part 22 into the radially moving end, so that the three processes of pushing, sealing and cutting are completed consecutively on the same radial trajectory. Specifically, during the radial movement of the film pushing assembly 20, the processing tool is directly fed into the receiving recess 13 inside the winding needle 10 for operation. At this time, the receiving recess 13 serves as a mold groove for processing operations. With the external constraint of the pressing assembly 50, the film material is in a fully positioned state at the moment of processing, eliminating the tension fluctuations caused by the film material when transferring between different work stations in the traditional solution, thereby significantly ensuring the processing quality of the battery cell.

[0048] Specifically, the film-pushing assembly 20 includes a push rod for connecting the film-pushing drive component, and both the heat-sealing portion 21 and the cutting portion 22 are fixed to the push rod. The heat-sealing portion 21 includes a heating element disposed at the end of the film-pushing assembly 20, which is configured to heat-seale multiple layers of the workpiece 60 to be wound together by hot pressing. Therefore, at least two layers of the workpiece 60 to be wound are tightly bonded under the joint positioning of the film-pushing assembly 20 and the pressing assembly 50, and the heat-sealing portion 21 melts and bonds the diaphragms 61 in the workpiece 60 to be wound together by hot pressing.

[0049] Specifically, the reciprocating movement of the film pushing assembly 20 is driven by a film pushing drive, which can be any of the following driving devices: cylinder, linear motor, servo motor, etc. Those skilled in the art will understand that the above driving methods can all realize the reciprocating movement of the film pushing assembly 20 along the radial direction of the winding needle 10, and the specific choice depends on the equipment's requirements for cost, speed, and accuracy.

[0050] The cutting section 22 includes an electrothermal cutting wire or a laser emitter located at the end of the push rod. When an electrothermal cutting wire is used, the wire is heated by electricity to thermally melt and cut the workpiece 60 to be wound, resulting in a smooth, burr-free cut, suitable for the stable cutting of polymer film materials such as the diaphragm 61. When a laser emitter is used, high-precision cutting is achieved through non-contact laser ablation, offering the advantage of precise cutting position and avoiding damage to other areas of the workpiece 60 to be wound, making it suitable for battery cell winding scenarios with high cutting precision requirements.

[0051] It is understood that, in addition to electrothermal cutting wire and laser emitting head, the cutting part 22 may also be selected from cold cutting blade, ultrasonic cutting head or pulse hot knife structure, all of which are within the protection scope of this embodiment.

[0052] Please refer to Figure 3 This is a schematic diagram showing the film-pushing assembly 20 and the pressing assembly 50 in their initial positions. In actual operation, as the film-pushing assembly 20 enters the receiving recess 13, the heat-sealing part 21 located at the end of the film-pushing assembly 20 first contacts and presses the film material, such as... Figure 4 As shown, the polymer film material undergoes molten bonding through thermal conduction; then, as... Figure 5 As shown, the cutting section 22 performs the cutting at the same position. Since sealing and cutting share a single push rod, their relative positions remain constant, avoiding cutting position deviations caused by mechanical backlash and ensuring the production quality of the battery cells. Furthermore, this integrated design significantly reduces the space occupied by the winding head, making the equipment structure more compact.

[0053] Furthermore, the winding device is also equipped with a sensor, which is a pressure sensor or a position sensor, to detect the positioning status of the film pushing assembly 20 and the tension of the part to be wound 60, so as to ensure that the part to be wound 60 is fully attached and tensioned before performing the heat sealing action.

[0054] In this embodiment, the pressing component 50 and the film pushing component 20 can achieve coordinated operation by relying on their independent drives. In practical applications, a limiting structure can also be provided as needed to limit the movement stroke of the pressing component 50 and control the pressing force. It is understood that any existing limiting structure can be used, as long as it can achieve the effect of limiting displacement, and will not be elaborated further here.

[0055] Furthermore, the pressing assembly 50 and the film pushing assembly 20 are driven independently, thus their operation sequence is separated. In actual operation, the film pushing assembly 20 first pushes the two layers of the workpiece 60 to be wound into the receiving recess 13 of the winding needle 10 and tensions them. After the two layers of the workpiece 60 to be wound are completely adhered, the pressing assembly 50 then moves to hold the outer peripheral surface of the winding needle 10, ensuring the stable execution of the heat sealing and cutting actions.

[0056] Specifically, the pressing assembly 50 includes movable pressure rollers. Preferably, two movable pressure rollers are provided, respectively located on both sides of the film pushing assembly 20, for abutting against both sides of the cutting position of the workpiece 60 to be wound. The purpose of using pressure rollers is to utilize the arc-shaped working surface of the pressure roller to form a stable contact with the cylindrical outer circumference of the winding needle, so that the workpiece 60 to be wound is subjected to uniform force; and the pressure roller can rotate or roll relative to the winding needle during the pressing and retraction process, converting sliding friction into rolling friction, thereby avoiding the risk of scratching the workpiece 60 to be wound.

[0057] It is understandable that instantaneous mechanical stress will be generated during the cutting process, or displacement may occur due to membrane shrinkage. In this embodiment, by applying a holding force symmetrically on both sides of the cutting position, the membrane material in the area to be cut is kept in a flat and taut state, ensuring that the cut membrane end will not wrinkle due to tension release. This not only ensures the flatness of the cut surface, but also provides an ideal flat surface for subsequent end fixing.

[0058] In order to achieve automatic end capture, the winding device also includes an end fixing device, which is located on the inner wall of the receiving recess 13 and is used to fix the end of the film material formed after the winding part 60 is cut.

[0059] Please refer to this again. Figure 1 ,as well as Figures 3 to 5 Specifically, the end fixing device includes an adsorption device, which includes an adsorption channel located inside the needle coil 10. The adsorption channel has a physical interface for connecting to a negative pressure source. Meanwhile, the inner wall of the receiving recess 13 is provided with a plurality of adsorption holes 31, all of which are connected to the adsorption channel.

[0060] Both the first half needle 11 and the second half needle 12 can be equipped with adsorption channels. In actual operation, only one half needle's adsorption channel can be activated, or the adsorption channel of the corresponding half needle can be activated according to the rotation direction of the winding needle 10 to adapt to different winding conditions.

[0061] Based on the aforementioned structure, after the cutting part 22 completes the cutting, the negative pressure source generates instantaneous suction at the adsorption hole 31 through the adsorption channel, adsorbing and adhering the membrane material end in the receiving recess 13 to the inner wall, such as... Figure 6 As shown. This non-contact fixing method effectively solves the problem that mechanical grippers can easily damage the electrode 62 or diaphragm 61, improving the reliability and speed of fixing.

[0062] It is understandable that, in addition to negative pressure adsorption, the end fixing device can also adopt other alternative implementation schemes, such as a mechanical clamping mechanism, an electrostatic adsorption mechanism, an adhesive positioning layer or a micro hot melt pressure head provided on the inner wall of the receiving recess 13, as long as it can reliably fix the end of the part to be wound 60 and adapt to the groove structure of the winding needle 10.

[0063] In a preferred embodiment, the coiling needle 10 includes a first half needle 11 and a second half needle 12 disposed opposite to each other, with a receiving recess 13 formed between the first half needle 11 and the second half needle 12.

[0064] Furthermore, in order to adapt to the production of battery cells of different specifications, the first half-pin 11 and the second half-pin 12 are movably connected.

[0065] In addition, the winding device also includes an adjustment drive mechanism 40, which includes a drive end connected to the first half needle 11 and / or the second half needle 12, for driving the two half needles to move closer or further apart radially. By finely adjusting the distance between the two half needles as the winding diameter increases, the tab spacing deviation can be eliminated to correct tab misalignment, and the tab alignment can be controlled within ±0.1mm, significantly reducing the cell scrap rate. At the same time, by matching the winding diameter change to stabilize the winding tension, and with variable speed / variable tension control, the tension fluctuation can be reduced to ±3%~±5%, avoiding wrinkles, breaks and microcracks in the electrode sheets, thus improving the core forming quality from the source.

[0066] Specifically, the adjustment drive mechanism 40 can be a conventional drive structure such as a lead screw, cylinder, or cam, and can be flexibly selected according to the overall design requirements of the equipment in practical applications.

[0067] Please refer to the reference again. Figures 1 to 6 Based on the foregoing embodiments, this embodiment of the invention provides a winding method, implemented using the winding apparatus provided in the above embodiments, comprising:

[0068] S1. Drive the film pushing assembly 20 to move radially, push the part to be wound 60 into the receiving recess 13 and tension it;

[0069] S2. Drive the clamping assembly 50 to hold the workpiece to be wound 60 at the outer periphery of the winding needle 10;

[0070] S3. Control the hot-pressing part 21 to hot-press the multi-layer workpiece 60 to be wound, and control the cutting part 22 to cut the hot-pressed workpiece 60 to be wound.

[0071] Based on the aforementioned steps, the film pushing assembly 20 is first driven to move radially, and the part to be wound 60 is pushed into the receiving recess 13 of the winding needle 10 through the end of the push rod and is made to be in a tensioned state; then, the two movable pressure rollers of the driving pressing assembly 50 are pressed against the outer periphery of the winding needle 10 to fix the film material on the surface of the winding needle 10; next, the heating device of the hot pressing part 21 is controlled to perform hot pressing and hot pressing, so that the multi-layer film material is formed as a whole, and the cutting part 22 is controlled to cut the hot-pressed film material.

[0072] Furthermore, in this embodiment, after cutting the membrane material, the method further includes: activating negative pressure adsorption to firmly attach the cut end to the inner wall of the recess, and the winding needle 10 starting to rotate to perform winding.

[0073] like Figure 7 As shown, after the cutting action is completed, the film pushing assembly 20 and the pressing assembly 50 retract and reset radially along the winding needle 10. Then, the winding needle 10 starts to rotate and continues to perform the winding action. When the winding is completed, the adsorption device cancels the adsorption to facilitate the unloading of the wound battery cell.

[0074] The winding method provided in this embodiment achieves a high degree of synchronization of the pre-winding process through seamless connection of pushing, pressing, hot-pressing, cutting, and adsorption actions, effectively solving the problems of slow roll changing and low precision in traditional winding processes.

[0075] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not be construed as limiting the scope of protection of this application. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this application and utilizing the content described in the text and drawings of this application, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of protection of this application.

Claims

1. A winding device, characterized in that, include: The outer peripheral surface of the coiling needle (10) is provided with an inwardly recessed receiving recess (13). The film pushing assembly (20) is driven to reciprocate along the radial direction of the winding needle (10), and includes an insertion end for extending into the receiving recess (13) as the film pushing assembly (20) moves. The insertion end is provided with a heat-bonding part (21) for heat-bonding two or more layers of the workpiece (60) to be wound, and a cutting part (22) for cutting the workpiece (60) to be wound. A clamping assembly (50) is disposed on the side of the winding needle (10). The clamping assembly (50) includes two clamping members (51). The clamping members (51) can be driven to abut against the outer peripheral surface of the winding needle (10) to fix the workpiece (60) to be wound in the processing position.

2. The winding device according to claim 1, characterized in that, It also includes an end fixing device, which is located on the inner wall of the receiving recess (13) and is used to fix the end adsorption device of the film material formed after the winding part (60) is cut.

3. The winding device according to claim 2, characterized in that, The end fixing device includes an adsorption device, which includes an adsorption channel inside the coil needle (10), and the adsorption channel is provided with a physical interface for connecting a negative pressure source; the adsorption device also includes a plurality of adsorption holes (31) on the inner wall of the receiving recess (13), and the plurality of adsorption holes (31) are all connected to the adsorption channel.

4. The winding device according to claim 1, characterized in that, The film pushing assembly (20) includes a push rod for connecting the film pushing drive, and the heat sealing part (21) and the cutting part (22) are both fixed to the push rod.

5. The winding device according to claim 1, characterized in that, The heat-sealing part (21) includes a heating device disposed at the end of the film-pushing assembly (20), the heating device being configured to heat-seale multiple layers of the workpiece (60) to be wound together by hot pressing.

6. The winding device according to claim 1, characterized in that, The cutting section (22) includes an electrothermal cutting wire or a laser emitting head disposed at the end of the push rod.

7. The winding device according to claim 1, characterized in that, The coiled needle (10) includes a first half needle (11) and a second half needle (12) arranged opposite to each other, and the receiving recess (13) is formed between the first half needle (11) and the second half needle (12).

8. The winding apparatus according to claim 7, characterized in that, The first half-needle (11) and the second half-needle (12) are movably connected; The winding device further includes an adjustment drive mechanism (40), which includes a drive end connected to the first half needle (11) and / or the second half needle (12) for driving the first half needle (11) and the second half needle (12) to move closer or further apart in the radial direction.

9. The winding device according to claim 1, characterized in that, The pressing assembly (50) includes two movable pressure rollers, which are respectively disposed on both sides of the film pushing assembly (20) and are used to abut against both sides of the cutting position of the part to be wound (60).

10. A winding method, characterized in that, Implemented based on the winding apparatus as described in any one of claims 1 to 9, comprising: Drive the film pushing assembly (20) to move radially, push the part to be wound (60) into the receiving recess (13) and tension it; The drive clamping assembly (50) abuts against the part to be wound (60) on the outer periphery of the winding needle (10); The heat-sealing section (21) heats the multi-layered workpiece (60) together, and the cutting section (22) cuts the heat-sealed workpiece (60).

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