A winding device, a winding method, and a battery production apparatus

Abstract

The present application relates to lithium battery production technical field, disclose a kind of winding device, winding method and battery production equipment, winding device includes: winding mandrel, the outer circumferential surface of winding mandrel is equipped with heating zone and adsorption zone;Pressing member, configured to press the film material to be wound in heating zone, to be wound film material is heated by heating zone and is pressed;Cutting member, setting in the pressing contact position below of pressing member and winding mandrel, configured to cut the film material to be wound in the state that film material to be wound is pressed in heating zone, so that the first end of the film material to be wound after cutting remains in adsorption zone, can realize the heating before winding or the simultaneous heating of heating zone when winding station winding, while cooperating with pressing member and cutting member to realize in situ heat sealing and cutting, can effectively shorten winding time, substantially improve the production efficiency of continuous winding, also can use the adsorption effect of diaphragm first end by the adsorption effect of diaphragm heat sealing due to viscosity, to improve the adsorption effect of diaphragm first end, to guarantee product yield.

Description

Technical Field

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

[0002] In the field of lithium battery manufacturing equipment technology, high production efficiency and excellent quality are the core driving forces for the continuous and high-speed development of lithium battery equipment. For the winding process of lithium battery cells, the winding device within a winding machine typically drives the film material (such as separators, electrodes, etc.) to be wound. Therefore, the winding device is the core of the cell winding machine, and its control precision over the film material plays a decisive role in the overall production efficiency and the quality of the wound cells.

[0003] In existing technologies, the thermal lamination or heat sealing operation of the film material to be wound is usually completed by an external film lamination mechanism independently located outside the front end of the winding shaft. In this layout, after the film material has undergone thermal lamination or cutting externally, it needs to be re-conveyed and introduced into the middle or surface of the winding needle via a conveying mechanism. Because the thermal lamination and cutting processes are spatially separated from the winding processes and belong to different external modules, continuous and uniform winding cannot be achieved when completing the previous winding cut or changing positions. This increases equipment auxiliary time and reduces winding efficiency and product yield.

[0004] Therefore, improvements to existing technologies are necessary. Summary of the Invention

[0005] This invention provides a winding device, a winding method, and battery production equipment to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A winding device, comprising:

[0008] A winding mandrel, wherein the outer circumferential surface of the winding mandrel is provided with a heating zone and an adsorption zone;

[0009] A pressing component, configured to press the film to be wound onto the heating zone, so as to perform thermal pressing of the film to be wound through the heating zone; and,

[0010] A cutting element is disposed below the pressing contact position between the pressing element and the winding mandrel, and is configured to cut the film to be wound while the film to be wound is pressed in the heating zone, so that the first end of the cut film to be wound remains in the adsorption zone.

[0011] Optionally, the adsorption zone is adjacent to or at least partially overlaps with the heating zone;

[0012] The pressing component has a pressing end that abuts against the outer surface of the heating zone; the pressing end is an elastic abutment end or a circular roller end;

[0013] The cutting component is a laser cutting component, an electrothermal cutting component, an ultrasonic cutting component, or a pneumatic cutting component; the cutting component has a cutting end, which is located adjacent to the pressing contact point.

[0014] Optionally, the winding mandrel includes at least two separate parts, which can be driven to move relative to each other to adjust the radius of the winding mandrel;

[0015] The at least two separate parts are symmetrical semi-circular structures.

[0016] Optionally, the winding device further includes a turret with multiple workstations, and the winding mandrel is disposed on the turret and cycles between the multiple workstations as the turret rotates.

[0017] Optionally, the plurality of workstations include at least a heating workstation and a winding workstation, and the pressing component and the cutting component are respectively disposed at the winding workstation;

[0018] The heating station is configured to preheat the heating zone of the winding mandrel before the mandrel enters the winding station.

[0019] Optionally, the heating station is provided with an external heating element, which is arranged corresponding to the heating zone of the winding mandrel;

[0020] And / or, the winding mandrel is provided with a conductive self-heating structure.

[0021] Optionally, the external heating element is a non-contact electromagnetic heating element.

[0022] Optionally, the plurality of workstations may further include an adhesive application workstation and a material unloading workstation arranged sequentially along the rotation direction of the turret;

[0023] The unloading station is equipped with an unloading clamp, and the winding mandrel is equipped with a clearance groove into which the unloading clamp extends. The unloading clamp is configured to extend into the clearance groove to stretch the battery cell for unloading.

[0024] The present invention also provides a winding method, comprising:

[0025] Heating zone for heating the winding mandrel;

[0026] The film to be wound is wound onto the heated winding mandrel, and the film to be wound is pressed onto the heated area by the pressing component, so as to perform hot pressing on the film to be wound through the heated area.

[0027] While the film to be wound is pressed into the heating zone, the film to be wound is cut below the pressing contact position so that the first end of the cut film to be wound remains in the adsorption area of ​​the heated winding mandrel.

[0028] Perform the winding action.

[0029] The present invention also provides a battery production apparatus, including a winding device as described in any of the preceding claims.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention provides a winding device, winding method, and battery production equipment. By integrating a heating zone and an adsorption zone on the outer circumferential surface of the winding mandrel, it achieves heating before winding or simultaneous heating of the heating zone during winding at the winding station. Simultaneously, it cooperates with a pressing component and a cutting component to achieve in-situ heat sealing and cutting, which can effectively shorten the winding time and significantly improve the production efficiency of continuous winding. It can also utilize the adsorption effect of the diaphragm itself due to its viscosity after heat sealing to improve the adsorption effect at the beginning of the diaphragm, thereby ensuring product yield.

[0032] 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

[0033] 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.

[0034] Figure 1 This is a schematic diagram illustrating the working principle of a winding device provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of a winding mandrel in a winding device provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of a winding device provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram illustrating the principle of the winding mandrel and the external heating element cooperating in a winding device according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the working state of a winding mandrel in a winding device provided in an embodiment of the present invention when it is located at the unloading station;

[0039] Figure 6 This is a flowchart of a winding method provided in an embodiment of the present invention.

[0040] Reference numerals: 10. Turret; 20. Winding mandrel; 21. Heating zone; 22. Adsorption zone; 31. Pressing component; 32. Cutting component; 33. External heating component; 34. Unloading clamping component; 35. Adsorption device; 41. Heating station; 42. Winding station; 43. Adhesive application station; 44. Unloading station; 50. Film material to be wound. Detailed Implementation

[0041] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this invention 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 invention and are therefore intended only as examples, not as limiting the scope of protection of this invention.

[0042] 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 the invention. 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 invention, 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.

[0043] 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 invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0044] In the description of this invention, 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 " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0045] In this invention, terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0046] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention 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.

[0047] Similar to the understanding in the Examination Guidelines, in this invention, 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 of this invention, "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.

[0048] In the description of the embodiments of the present invention, the spatial 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," "circumferential," etc., 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 the present invention 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 the present invention.

[0049] Unless otherwise explicitly stated or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this invention, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances.

[0050] In existing continuous winding equipment, the film lamination (heat sealing) mechanism is typically placed as a separate external module at the front end of the winding station. This means that in existing technology, film lamination and winding are separate modules. This results in the film material needing to be re-transported to the winding needle position via a feeding or conveying mechanism after lamination or cutting is completed externally. This introduces auxiliary waiting time due to process flow and positioning adjustments, undoubtedly increasing auxiliary time in the production process and significantly impacting the production efficiency of high-frequency, high-speed winding, as well as product yield.

[0051] To address the aforementioned problems, embodiments of the present invention provide a winding apparatus, a winding method, and battery production equipment. It should be noted that, unless otherwise specified, features in the embodiments of the present invention can be combined with each other.

[0052] Please refer to Figures 1 to 2 This embodiment provides a winding device that enables efficient winding without stopping the machine, reduces process changeover time, and improves winding efficiency and product yield.

[0053] Specifically, the winding device provided in this embodiment includes a winding mandrel 20, a pressing component 31, and a cutting component 32. The winding mandrel 20 is rotatably mounted on the mounting base and is used to support and drive the winding of the film material 50 to be wound. The outer peripheral surface of the winding mandrel 20 is provided with a heating zone 21 and an adsorption zone 22.

[0054] Furthermore, the pressing member 31 is provided corresponding to the winding mandrel 20 and is configured to press the film material 50 to be wound onto the heating zone 21, so as to perform thermal pressing on the film material 50 to be wound through the heating zone 21. The cutting member 32 is provided below the pressing contact position between the pressing member 31 and the winding mandrel 20, and is configured to cut the film material 50 to be wound while it is pressed onto the heating zone 21, so that the first end of the cut film material 50 is left in the adsorption zone 22.

[0055] Furthermore, the adsorption area 22 of the winding mandrel 20 is equipped with an adsorption device 35. For example, the adsorption device 35 is specifically a vacuum adsorption assembly; the adsorption area 22 has a cavity structure, which has adsorption holes on the adsorption surface of the film material 50 to be wound, and the cavity structure is connected to an adsorption device, such as a vacuum device, thereby enabling the adsorption of the film material 50 to be wound through the principle of vacuum adsorption. It is understood that the adsorption device 35 under this vacuum adsorption principle can adopt any commercially available structure, as long as it can achieve the adsorption function; further details are omitted here.

[0056] It should be noted that the film material 50 to be wound mentioned in this embodiment refers to materials such as separators and electrodes required in the battery manufacturing process. The beginning end of the film material 50 to be wound mentioned in this embodiment refers to the end of the film material 50 near the feeding side after it has been cut.

[0057] In summary, this embodiment changes the conventional external membrane composite layout by directly integrating the heating zone 21 and the adsorption zone 22 on the outer peripheral surface of the winding mandrel 20. The heating zone 21 on the outer peripheral surface of the winding mandrel 20 preheats the membrane material before or during contact. When the pressing member 31 moves towards the winding mandrel 20 and presses the membrane material 50 to be wound onto the heating zone 21, heat is conducted to the membrane material 50 under pressure, causing localized micro-melting and instantaneous heat sealing. Under the pressed and heat-sealed state, the cutting member 32 performs a cutting action. Since the membrane material 50 is pressed and fixed on the outer peripheral surface of the winding mandrel 20 at this time, the membrane material will not slip or vibrate during cutting. Furthermore, the cut end of the membrane material 50, under the combined action of the residual adhesiveness of the heat sealing and the adsorption force of the adsorption device 35, can be firmly retained and fixed on the adsorption zone 22.

[0058] In some alternative embodiments, the adsorption zone 22 and the heating zone 21 are arranged adjacent to each other, or the adsorption zone 22 and the heating zone 21 at least partially overlap.

[0059] Specifically, the pressing component 31 has a pressing end that abuts against the outer surface of the heating zone 21; the pressing end can be an elastic abutment end or a circular roller end. When an elastic abutment end is used, the elastic end deforms during the pressing process of the pressing component 31, and the pressing contact area expands from line contact to surface contact, thereby increasing the heat sealing area between the film material 50 to be wound and the heating zone 21, and significantly improving the success rate of hot pressing; while the contact area of ​​the circular roller end is only a line.

[0060] The cutting element 32 has a cutting end, which is located adjacent to the pressing contact point.

[0061] As an optional implementation, the cutting element 32 can be a laser cutting element, an electrothermal cutting element, an ultrasonic cutting element, or a pneumatic cutting element; correspondingly, the cutting ends are laser focusing light spots, electrothermal blades or heating wires, ultrasonic blades, pneumatic cutters, or mechanical cutters. All of the above-mentioned cutting ends can achieve rapid cutting of the film material 50 to be wound according to their respective working characteristics, and all meet the position requirements of being set near the pressing contact point, so as to ensure that the first end of the film material can be accurately retained in the adsorption area 22 after cutting.

[0062] By designing the adsorption zone 22 and the heating zone 21 to be adjacent or at least partially overlapping, the heat-sealing position, the cutting position, and the adsorption position are highly concentrated in space. When the pressing end abuts against the outer surface of the heating zone 21, its elastic or rolling deformation adaptability can compensate for slight differences in the film thickness, thereby applying uniform and constant pressure to the film 50 to be wound, effectively ensuring the uniformity of heat conduction and avoiding scratches caused by rigid contact with the film 50 to be wound.

[0063] Furthermore, the cutting end, located near the pressing contact point, can quickly cut the film material 50 to be wound with a small stroke. Since the adsorption area 22 overlaps with or is adjacent to the heating area 21, the negative pressure adsorption force or electrostatic adsorption force of the adsorption area 22 can directly act on the first end formed by the micro-fracture of the film material 50 to be wound at the instant after cutting. Combined with the residual micro-adhesion of the heat seal, a seamless connection of the first end is achieved, effectively avoiding the failure of the first end to reset or slippage.

[0064] Furthermore, the winding mandrel 20 includes at least two separate parts, which can be driven to move relative to each other to adjust the radius of the winding mandrel 20; in this embodiment, the at least two separate parts are preferably symmetrical semi-circular structures, for example, divided into an upper half needle and a lower half needle.

[0065] That is, during the winding stage, the symmetrical semi-circular structure is pushed outward by the internal drive mechanism (such as a wedge, connecting rod, or pneumatic mechanism) to maintain the required working radius, providing a stable winding reference and tension support, and ensuring compact interlayer film. When winding is completed and adhesive is applied, the drive mechanism moves in the opposite direction, driving at least two separate parts to move towards each other to shrink the outer diameter of the winding mandrel 20.

[0066] Please refer to Figure 3 In some alternative embodiments, the winding device further includes a turret 10 with multiple stations. The winding mandrel 20 is disposed on the turret 10 and can cycle between the multiple stations with the turret 10.

[0067] In this embodiment, the multiple stations include at least a heating station 41 and a winding station 42, and the aforementioned pressing member 31 and cutting member 32 are correspondingly disposed in the winding station 42. The heating station 41 is configured to preheat the heating zone 21 of the winding mandrel 20 before the winding mandrel 20 enters the winding station 42.

[0068] It should be noted that by introducing a multi-station structure with a 10-station turret, heating, winding, and other processes are handled in parallel at different spatial stations. When a winding mandrel 20 is located at the heating station 41, the heating station 41 preheats its heating zone 21, ensuring its temperature reaches a preset value in advance. When the turret 10 rotates and switches, the preheated winding mandrel 20 enters the winding station 42 in a preheated state. At this time, the pressing component 31 and cutting component 32 located at the winding station 42 perform pressing, heat sealing, and cutting actions on the film material 50 to be wound. Since the heating and heat storage process of the heating zone 21 is completed entirely in advance at the heating station 41, when the mandrel arrives at the winding station 42, the heat sealing action can be initiated without waiting for a heating period, effectively shortening the production auxiliary time and cycle of a single cell, and improving the continuity and efficiency of winding production.

[0069] Please refer to Figure 4 In one optional embodiment, an external heating element 33 is provided at the heating station 41, and the external heating element 33 is provided corresponding to the heating area 21 of the winding mandrel 20; further, the external heating element 33 is a non-contact electromagnetic heating element.

[0070] In another alternative embodiment, the winding mandrel 20 is provided with a conductive self-heating structure; or, an external heating element 33 and a built-in conductive self-heating structure are used simultaneously.

[0071] When a conductive self-heating structure (such as a built-in resistance wire or PTC thermistor) is used inside the winding mandrel 20, thermoelectric conversion is carried out directly inside the mandrel, and heat is conducted from the inside to the outside, resulting in high thermal efficiency and minimal interference from the external environment.

[0072] When a non-contact electromagnetic heating element is used as an external heating element 33, it is possible to avoid introducing mechanical sliding contact lines or terminals on the rotating turret 10, thereby eliminating electrical faults or fire hazards caused by mechanical wear and poor contact, and improving the operational reliability and lifespan of the equipment. At the same time, electromagnetic induction heating is fast and temperature control is precise, which can match the production cycle of high-frequency turret 10 switching.

[0073] Please continue to refer to this. Figure 3 In order to form a complete automated operation closed loop, the multiple workstations also include an adhesive application station 43 and a material unloading station 44 arranged sequentially along the rotation direction of the turret 10.

[0074] Please refer to further information. Figure 5 The unloading station 44 is provided with an unloading clamping member 34, and the winding mandrel 20 is provided with a relief groove into which the unloading clamping member 34 extends. The unloading clamping member 34 is configured to extend into the relief groove to stretch the battery cell for unloading.

[0075] In some optional embodiments, the winding mandrel 20 is provided with at least two clearance grooves, each clearance groove is provided on the outer peripheral surface of the winding mandrel 20 and is centrally symmetrical, so that each unloading clamp 34 clamps the battery cell at the same time, the force is more balanced, and the unloading process is more stable and reliable.

[0076] Understandably, the design of the clearance groove provides ample clearance space for the unloading clamping member 34, enabling the unloading clamping member 34 to directly act on the stable inner core area of ​​the battery cell, avoiding battery cell deformation or damage to interlayer alignment that may be caused by clamping from the outer periphery.

[0077] In summary, in this embodiment, the entire multi-station winding device operates as follows: the heating station 41, winding station 42, adhesive application station 43, and unloading station 44 are cycled and switched. After the battery cell is wound and formed at the winding station 42, the turret 10 rotates it to the adhesive application station 43 for tail trimming and application of protective tape, and then rotates it to the unloading station 44. During unloading, at least two separate parts of the winding mandrel 20 contract inward to reduce the outer diameter. The unloading clamping member 34 (such as a mechanical gripper or unloading clamping rod) located at the unloading station 44 extends axially into the clearance groove on the winding mandrel 20, firmly clamping the battery cell from the innermost ring or end face, and then pulling the battery cell out axially to achieve unloading.

[0078] After the material is unloaded, the unloaded winding mandrel 20 returns to the heating station 41 with the rotation of the turret 10 and enters the next cycle.

[0079] Please refer to Figure 6 Based on the above embodiments, this invention also provides a winding method, including the following steps:

[0080] S1, Heating zone 21 of heating the winding mandrel 20.

[0081] The preheating station 41 allows the heating zone 21 of the winding mandrel 20 to store sufficient heat energy in preparation for subsequent contact thermal bonding.

[0082] S2. The film material 50 to be wound is wound onto the heated winding mandrel 20, and the film material 50 to be wound is pressed onto the heated area 21 by the pressing member 31.

[0083] In this step, when the pressing component 31 pushes the film material 50 to be wound to the heating zone 21 which has reached the calibrated temperature, heat is rapidly conducted to the film material under the set pressure, causing the film material 50 to undergo local thermoplastic cross-linking or micro-melting, so as to perform hot pressing on the film material 50 through the heating zone 21, thereby achieving hot pressing by utilizing the micro-adhesion of the film material.

[0084] S3. While the film material 50 to be wound is pressed against the heating zone 21, the film material 50 to be wound is cut below the pressing contact position.

[0085] The cutting element 32 is activated, and the film material is cut while it is firmly constrained by the pressing element 31 on the outer circumference of the winding mandrel 20, so that the first end of the cut film material 50 to be wound remains in the adsorption area 22. Under the combined capture of the adsorption force of the adsorption area 22 and the residual adhesiveness of the heat seal, the newly cut first end is flatly and precisely adhered and solidified on the adsorption area 22, avoiding the first end from being skewed.

[0086] S4. Perform the winding action.

[0087] The winding mandrel 20 begins to rotate, first causing the membrane material 50, formed by pressing two layers of diaphragms together, to be pre-wound a certain number of times around the outer circumference of the winding mandrel 20. Then, positive and negative electrode plates are inserted between the two layers of diaphragms, and winding continues until the cell winding is completed. This method ensures the alignment of the membrane material's leading edge by coordinating the heat sealing, pressing, cutting, and adsorption processes at the same spatial node and overlapping time dimension.

[0088] Based on the foregoing embodiments, this invention also provides a battery production equipment, including a winding device as described in any of the preceding embodiments. By configuring this multi-station integrated heating winding device, the battery production equipment can be efficiently integrated with electrode coating, rolling, and slitting equipment, as well as subsequent assembly and electrolyte injection equipment, which is beneficial for achieving high-quality and high-volume battery production.

[0089] Because this winding device reduces the auxiliary time and head slippage in the traditional winding process from the perspective of mechanical structure and process principle, the total output of battery cells per unit time of the entire battery production equipment is increased. Moreover, the internal structure of the output battery cells is highly consistent and there are no alignment defects, which helps to reduce the safety hazards caused by internal defects of the battery and provides core equipment support for the large-scale production of high-quality batteries.

[0090] Finally, it should be noted that although the above embodiments have been described in the description and drawings of this invention, this should not be construed as limiting the scope of protection of this invention. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this invention and utilizing the content described in the description and drawings, 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 invention.

Claims

1. A winding device, characterized in that, include: A winding mandrel (20) is provided with a heating zone (21) and an adsorption zone (22) on its outer peripheral surface. The pressing component (31) is configured to press the film material (50) to be wound onto the heating zone (21) so as to perform hot pressing on the film material (50) to be wound through the heating zone (21); as well as, The cutting member (32) is disposed below the pressing contact position between the pressing member (31) and the winding mandrel (20), and is configured to cut the film to be wound (50) while the film to be wound (50) is pressed into the heating zone (21), so that the first end of the cut film to be wound (50) remains in the adsorption zone (22).

2. The winding device according to claim 1, characterized in that, The adsorption zone (22) is adjacent to or at least partially overlaps with the heating zone (21); The pressing component (31) has a pressing end that abuts against the outer surface of the heating zone (21); the pressing end is an elastic abutment end or a circular roller end; The cutting component (32) is a laser cutting component, an electrothermal cutting component, an ultrasonic cutting component, or a pneumatic cutting component; the cutting component (32) has a cutting end, which is located adjacent to the pressing contact point.

3. The winding device according to claim 1, characterized in that, The winding mandrel (20) includes at least two separate parts, which can be driven to move relative to each other to adjust the radius of the winding mandrel (20); The at least two separate parts are symmetrical semi-circular structures.

4. The winding device according to claim 1, characterized in that, It also includes a turret (10) with multiple workstations, and the winding mandrel (20) is disposed on the turret (10) and switches cyclically between the multiple workstations with the turret (10).

5. The winding device according to claim 4, characterized in that, The plurality of work stations include at least a heating work station (41) and a winding work station (42), and the pressing part (31) and the cutting part (32) are respectively disposed at the winding work station (42). The heating station (41) is configured to preheat the heating zone (21) of the winding mandrel (20) before the winding mandrel (20) enters the winding station (42).

6. The winding device according to claim 5, characterized in that, The heating station (41) is provided with an external heating element (33), which is provided in the heating zone (21) of the winding mandrel (20); And / or, the winding mandrel (20) is provided with a conductive self-heating structure.

7. The winding apparatus according to claim 6, characterized in that, The external heating element (33) is a non-contact electromagnetic heating element.

8. The winding device according to claim 5, characterized in that, The plurality of workstations also include an adhesive application workstation (43) and a material unloading workstation (44) arranged sequentially along the rotation direction of the turret (10). The unloading station (44) is provided with an unloading clamp (34), and the winding mandrel (20) is provided with a clearance groove into which the unloading clamp (34) extends. The unloading clamp (34) is configured to extend into the clearance groove to stretch the battery cell for unloading.

9. A winding method, characterized in that, include: Heating zone (21) of heating winding mandrel (20); The film material (50) to be wound is wound on the heated winding mandrel (20), and the film material (50) to be wound is pressed into the heating zone (21) by the pressing member (31) so as to perform hot pressing on the film material (50) to be wound through the heating zone (21); While the film to be wound (50) is pressed against the heating zone (21), the film to be wound (50) is cut below the pressing contact position so that the first end of the cut film to be wound (50) remains in the adsorption zone (22) of the heating winding mandrel (20). Perform the winding action.

10. A battery manufacturing apparatus, characterized in that, Includes the winding device as described in any one of claims 1 to 8.

Images