Winding device and battery manufacturing device

Abstract

The present application is applicable to the technical field of battery production devices, and provides a winding device and a battery manufacturing device. The winding device (100) comprises: a compounding mechanism (10) used for unwinding a first electrode sheet (210), a first separator (220), and a second electrode sheet (230), and pressing the first electrode sheet (210), the first separator (220), and the second electrode sheet (230) to form a compounding sheet (250); a separator unwinding mechanism (20) used for unwinding a second separator (240); and a winding mechanism (30) provided on a discharge side of the compounding mechanism (10), the winding mechanism (30) being used for winding the compounding sheet (250) and the second separator (240) to form an electrode assembly (200). The winding device provided by the embodiments of the present application has reasonable layout, and the problem of the crowded space above the winding mechanism is solved.

Description

Winding equipment and battery manufacturing equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 202410043912.0, and invention name “Winding Equipment and Battery Manufacturing Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery production equipment, and in particular to a winding device and a battery manufacturing device. Background Art

[0003] During battery production, winding equipment is required to wind the electrodes into cells. Conventional winding equipment feeds the cathode electrode, anode electrode, and separator into the winding mechanism separately and winds them onto the winding mechanism. However, since the cathode electrode, anode electrode, and separator are all gathered at the winding mechanism's feed point for winding, the space becomes very crowded, making it inconvenient to arrange the various components.

[0004] Summary of the Invention

[0005] In view of this, an embodiment of the present application provides a winding device and a battery manufacturing device, which can solve the problem of crowded space above the winding mechanism.

[0006] An embodiment of the present application proposes a winding device, including: a composite mechanism for unwinding a first electrode sheet, a first diaphragm, and a second electrode sheet, and pressing the first electrode sheet, the first diaphragm, and the second electrode sheet to form a composite sheet body; a diaphragm unwinding mechanism for unwinding the second diaphragm; a winding mechanism, arranged on the discharge side of the composite mechanism, and the winding mechanism is used to wind the composite sheet body and the second diaphragm to form an electrode assembly.

[0007] The winding device includes a composite mechanism, a diaphragm unwinding mechanism, and a winding mechanism. The composite mechanism is used to press the first electrode sheet, the first diaphragm, and the second electrode sheet to form a composite sheet body. The diaphragm unwinding mechanism is used to unwind the second diaphragm. The winding mechanism is used to wind the composite sheet body and the second diaphragm to form an electrode assembly. The winding device first composites the first electrode sheet, the first diaphragm, and the second electrode sheet into a composite sheet body, and then winds the composite sheet body and the second diaphragm on the winding mechanism. The composite mechanism and the winding mechanism of the winding device can be arranged at intervals, each of which can obtain a larger space. In addition, the winding device does not need to feed the cathode electrode sheet, the anode electrode sheet, and the diaphragm to the winding mechanism separately, which solves the problem of crowded space above the winding mechanism, optimizes the layout of the winding device, and facilitates the flexible arrangement of various components.

[0008] In some embodiments, the winding device further includes a first detection device, which is disposed between the composite mechanism and the winding mechanism and is used to detect the composite sheet.

[0009] By adopting the above technical solution, the winding equipment includes a first detection device arranged between the composite mechanism and the winding mechanism. The positions of the electrode and the diaphragm in the composite sheet are relatively fixed and not easy to shift, and the detection result is more accurate. At the same time, arranging the first detection device upstream of the winding mechanism can more comprehensively detect the electrode assembly, reduce the detection blind area, and improve the detection accuracy.

[0010] In some embodiments, the composite mechanism includes: a first unwinding roller for unwinding the first pole piece; a second unwinding roller for unwinding the first diaphragm; a third unwinding roller for unwinding the second pole piece; and a composite assembly for composite the first pole piece, the first diaphragm, and the second pole piece.

[0011] The composite structure can composite the first pole piece, the first diaphragm and the second pole piece at one time, and the composite method is simple and the composite efficiency is high.

[0012] In some embodiments, the winding device further includes a frame, the first unwinding roller, the second unwinding roller and the third unwinding roller are arranged on one side of the frame, and the winding mechanism is arranged on the other side of the frame.

[0013] By adopting the above technical solution, the winding equipment separates the unwinding structure and the winding mechanism, each of which has a larger space, which is conducive to the flexible arrangement of various components.

[0014] In some embodiments, the winding device further includes a cache mechanism, which is disposed between the composite component and the winding mechanism, and is used for winding the composite sheet.

[0015] By adopting the above technical solution, the buffer mechanism can buffer and release the composite sheet, so that the winding mechanism can continuously obtain material supply, thereby improving the winding efficiency.

[0016] In some embodiments, the winding device also includes: a first pole piece cutting device, which is arranged between the first unwinding roller and the composite component, and the first pole piece cutting device is used to cut the first pole piece; a second pole piece cutting device, which is arranged between the third unwinding roller and the composite component, and the second pole piece cutting device is used to cut the second pole piece.

[0017] By adopting the above technical solution, the cache mechanism can cache and release the composite sheet, thereby ensuring that the winding mechanism can continue to obtain material when the pole piece is cut off, reducing the occurrence of the winding mechanism slowing down due to the cutting of the pole piece, and significantly improving the winding efficiency.

[0018] In some embodiments, the caching mechanism includes a fixed roller and a floating roller arranged at intervals, the fixed roller is fixed relative to the composite component, and the floating roller can move closer to or away from the fixed roller to change the length of the composite sheet cached in the caching mechanism, wherein the movement direction of the floating roller intersects with the conveying direction of the composite component.

[0019] By adopting the above technical solution, the cache mechanism can adjust the length of the cache composite sheet to adapt to the winding speed of the winding mechanism and the speed of pole piece cutting.

[0020] In some embodiments, the winding mechanism includes a turntable and at least two winding needles rotatably arranged on the turntable; the winding mechanism has a winding station and a unloading station arranged at intervals along the rotation direction of the turntable, and the winding needle can enter one of the winding station and the unloading station as the turntable rotates.

[0021] The winding mechanism provided in the embodiment of the present application includes a turntable and at least two winding needles arranged on the turntable. Different winding needles can be rotated to the winding station in turn for winding, which reduces the feeding waiting time of the composite sheet and the second diaphragm and improves the winding efficiency.

[0022] In some embodiments, the winding device is further provided with a gluing station, which is arranged between the winding station and the unloading station along the rotation direction of the turntable, and the winding needle can enter one of the winding station, the gluing station and the unloading station as the turntable rotates.

[0023] In some embodiments, the winding mechanism further includes a glue-applying roller disposed at the glue-applying station, and the glue-applying roller is used to apply glue to the tail end of the electrode assembly.

[0024] By adopting the above technical solution, the glue roller can apply glue to the tail end of the second diaphragm, and the tail end of the second diaphragm is not easily separated from the composite sheet, thereby improving the stability of the fit between the second diaphragm and the composite sheet; the winding mechanism can complete the winding and gluing processes at one time, thereby improving the manufacturing efficiency of the electrode assembly.

[0025] In some embodiments, the winding equipment is further provided with a finishing station, which is arranged between the winding station and the gluing station along the rotation direction of the turntable, and the winding needle can enter one of the winding station, the gluing station, the finishing station and the unloading station as the turntable rotates.

[0026] In some embodiments, the winding mechanism further includes a finishing roller disposed adjacent to the finishing station, and the finishing roller cooperates with the winding needle to press the electrode assembly to finish the electrode assembly.

[0027] By adopting the above technical solution, multiple winding needles can be rotated to the finishing roller in sequence to finish the electrode assembly, thereby improving the stability of the bonding between the second diaphragm and the composite sheet.

[0028] In some embodiments, there are at least four winding needles and they are spaced apart along the circumference of the turntable.

[0029] By adopting the above technical solution, at least four winding needles correspond to the winding, finishing, gluing and unloading actions respectively. The winding needle only performs one action at each workstation, shortening the time the winding needle needs to stay at each workstation and effectively improving the winding speed.

[0030] In some embodiments, the winding needle is retractably arranged on the turntable, and a retraction station is further provided on the winding device. The retraction station is located between the unloading station and the winding station along the rotation direction of the turntable. The winding needle can enter one of the winding station, the gluing station, the finishing station, the unloading station and the retraction station as the turntable rotates. When the winding needle enters the retraction station, the winding needle can retract relative to the turntable.

[0031] By adopting the above technical solution, the winding needle can perform winding, finishing, gluing, unloading and retraction actions at different workstations, thereby improving the winding speed.

[0032] In some embodiments, there are at least five winding needles and they are spaced apart along the circumference of the turntable.

[0033] By adopting the above technical solution, multiple winding needles can perform different actions at the same time, reducing the waiting time for feeding the composite sheet and the second diaphragm, and effectively improving the winding speed.

[0034] In some embodiments, the winding needle includes two main bodies rotatably arranged on the turntable, and the two main bodies are spaced apart to form an accommodating gap, and the accommodating gap is used for the composite sheet and the second diaphragm to pass through, and the two main bodies cooperate to wind the composite sheet and the second diaphragm.

[0035] By adopting the above technical solution, the head end of the composite sheet and the second diaphragm can enter the accommodating gap and be fixed. After that, the winding needle can rotate to wind the composite sheet and the second diaphragm on the winding needle, and the tail end of the composite sheet and the second diaphragm can be located on the outside of the winding needle, so as to facilitate subsequent finishing processing of the tail end of the electrode assembly.

[0036] In some embodiments, the membrane unwinding mechanism is disposed between the discharge side of the compounding mechanism and the feed side of the winding mechanism.

[0037] By adopting the above technical solution, the diaphragm unwinding mechanism is located downstream of the composite mechanism, the second pole piece provided by the diaphragm unwinding mechanism can be overlapped with the composite sheet and rolled together, and the diaphragm unwinding mechanism can be spaced apart from the winding mechanism to avoid the problem of crowded space above the winding mechanism.

[0038] In some embodiments, the diaphragm unwinding mechanism includes a diaphragm unwinding roller and a first conveying roller, the diaphragm unwinding roller is used to unwind the second diaphragm, the first conveying roller is used to allow the second diaphragm to merge with the composite sheet to form a superimposed sheet, and to convey the superimposed sheet to the winding mechanism.

[0039] By adopting the above technical solution, the winding equipment separately arranges each unwinding roller and the winding mechanism, and the layout is flexible and convenient.

[0040] In some embodiments, the winding device further includes a second detection device, which is disposed between the first conveying roller and the winding mechanism, and is used to detect the overlapped sheets.

[0041] By adopting the above technical solution, the second detection device is arranged between the first conveying roller and the winding mechanism, which can fully detect the state of the superimposed sheets, and the detection result can have a high accuracy.

[0042] In some embodiments, the winding device further includes a membrane composite assembly, which is disposed between the first conveying roller and the winding mechanism, and is used to composite the second membrane with the composite sheet.

[0043] By adopting the above technical solution, the second diaphragm and the composite sheet can be pre-combined before entering the winding mechanism and will not shift relative to each other.

[0044] In some embodiments, the diaphragm unwinding mechanism is provided on one side of the winding mechanism, and the diaphragm unwinding mechanism is used to transfer the second diaphragm to the winding needle located at the winding station, and the composite sheet and the second diaphragm merge on the winding needle on the winding station.

[0045] In some embodiments, the winding device further includes a membrane cutting mechanism, which is disposed adjacent to the winding mechanism and is configured to cut the first membrane and / or the second membrane.

[0046] By adopting the above technical solution, the diaphragm cutting mechanism is arranged at the winding mechanism, so that the winding equipment can cut the diaphragm before or after the electrode assembly is wound, without wasting time on separate diaphragm cutting, thereby improving the overall winding efficiency.

[0047] In some embodiments, along the rotation direction of the turntable, the diaphragm cutting mechanism is arranged between the winding station and the unloading station.

[0048] By adopting the above technical solution, the diaphragm cutting mechanism can cut the first diaphragm and / or the second diaphragm after the electrode assembly is completed winding, so as to facilitate the closing of the electrode assembly. Moreover, the diaphragm cutting mechanism is located between the winding station and the unloading station, and there is no need to waste separate diaphragm cutting time, and the winding efficiency of the winding equipment is relatively high.

[0049] In some embodiments, the membrane cutting mechanism is located on the feed side of the winding mechanism.

[0050] By adopting the above technical solution, the diaphragm cutting mechanism does not need to avoid the winding needle, which is conducive to simplifying the structure of the equipment.

[0051] In some embodiments, the winding device further includes a conveying member disposed between the membrane cutting mechanism and the winding mechanism, and the conveying member is used to transfer the first membrane and / or the second membrane to the winding mechanism.

[0052] By adopting the above technical solution, the winding equipment can convey the film while cutting the film, which significantly improves the winding efficiency compared with the method of cutting the film first and then conveying the film.

[0053] In some embodiments, the conveying member is a vacuum adsorption transmission belt.

[0054] By adopting the above technical solution, the stability of the conveying film can be improved and the probability of the film being tilted or deviated during the transmission process can be reduced.

[0055] In some embodiments, the conveying speed of the vacuum adsorption transmission belt is equal to the winding speed of the winding needle at the winding station.

[0056] By adopting the above technical solution, the tension of the diaphragm can be reduced to zero, reducing the probability of diaphragm deformation due to excessive tension, and the vacuum adsorption transmission belt has a faster transmission speed and high transmission efficiency.

[0057] In some embodiments, the diaphragm cutting mechanism includes a cam cutter and a cutter holder arranged opposite to each other. The cam cutter can rotate relative to the cutter holder and cooperate with the cutter holder to cut the first diaphragm and / or the second diaphragm.

[0058] By adopting the above technical solution, the cam cutter can perform cutting action periodically. When in use, the rotation period of the cam cutter can be confirmed according to the length and linear speed of the diaphragm, so that the cam cutter can cut the diaphragm without deceleration.

[0059] In some embodiments, the rotation period of the cam cutter is equal to the ratio of the length of the first diaphragm in the electrode assembly to the transmission line speed of the first diaphragm; and / or,

[0060] The duration of the rotation cycle of the cam cutter is equal to the ratio of the length of the second diaphragm in the electrode assembly to the transmission line speed of the second diaphragm.

[0061] By meeting the above conditions, the cam cutter can rotate continuously. Since the cam cutter does not need to stop, the waiting time for cutting is saved; the cam cutter can cut the film to be cut every time it rotates one circle. There is no need to reduce the transmission line speed of the film in order to cut the film, and the film can be cut without deceleration, which effectively improves the overall winding speed.

[0062] The present application also provides a battery manufacturing device, including a winding device.

[0063] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] FIG1 is a schematic structural diagram of a winding device provided in a first embodiment of the present application;

[0065] FIG2 is a schematic structural diagram of a winding device provided in a second embodiment of the present application;

[0066] FIG3 is a schematic structural diagram of a winding device provided in a third embodiment of the present application;

[0067] FIG4 is a schematic structural diagram of a winding device provided in a fourth embodiment of the present application;

[0068] FIG5 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application.

[0069] The meanings of the marks in the figure are as follows: 100, winding equipment; 10, composite mechanism; 11, first unwinding roller; 12, second unwinding roller; 13, third unwinding roller; 14, composite assembly; 20, diaphragm unwinding mechanism; 21, diaphragm unwinding roller; 22, first conveyor roller; 30, winding mechanism; 31, turntable; 32, winding needle; 321, main body; 322, accommodation gap; 33, tailing roller; 34, glue-applying roller; 301, winding station; 302, tailing station; 303, glue-applying station; 304, unloading station; 305, retraction station; 41, first detection device; 42, Second detection device; 51, first pole piece cutting device; 52, second pole piece cutting device; 60, cache mechanism; 61, fixed roller; 62, floating roller; 70, blanking assembly; 80, diaphragm cutting mechanism; 81, cam cutter; 82, knife holder; 90, conveying member; 200, electrode assembly; 210, first pole piece; 220, first diaphragm; 230, second pole piece; 240, second diaphragm; 250, composite sheet. Modes for Carrying Out the Invention

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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).

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] Currently, during the battery production process, winding equipment is required to wind the electrode sheets into battery cells. Commonly used winding equipment feeds the cathode electrode sheet, anode electrode sheet, and separator into the winding mechanism separately and winds them on the winding mechanism. However, since the cathode electrode sheet, anode electrode sheet, and separator are all gathered at the winding mechanism's feed point for winding, the space is very crowded and inconvenient for the arrangement of various components.

[0079] In order to solve the problem of crowded space in the winding equipment, the present application provides a winding equipment, including a composite mechanism, a diaphragm unwinding mechanism and a winding mechanism. The composite mechanism is used to press the first pole piece, the first diaphragm and the second pole piece to form a composite sheet body, the diaphragm unwinding mechanism is used to unwind the second diaphragm, and the winding mechanism is used to wind the composite sheet body and the second diaphragm to form an electrode assembly. The above-mentioned winding equipment first composites the first pole piece, the first diaphragm and the second pole piece into a composite sheet body, and then winds the composite sheet body and the second diaphragm on the winding mechanism. Since the composite mechanism and the winding mechanism of the above-mentioned winding equipment are arranged at intervals, each can obtain a larger space, which solves the problem of crowded space above the winding mechanism, optimizes the layout of the winding equipment, and is conducive to the flexible arrangement of various components.

[0080] The winding device provided in the embodiments of the present application can be used to manufacture electrode assemblies, which can be used as components for electrochemical reactions in battery cells, and the battery cells can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0081] The embodiment of the first aspect of the present application provides a winding device. Referring to Figures 1 and 5, the first embodiment of the present application proposes a winding device 100, including a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. The composite mechanism 10 is used to unwind the first electrode sheet 210, the first diaphragm 220 and the second electrode sheet 230, and press the first electrode sheet 210, the first diaphragm 220 and the second electrode sheet 230 to form a composite sheet body 250; the diaphragm unwinding mechanism 20 is used to unwind the second diaphragm 240; the winding mechanism 30 is arranged on the discharge side of the composite mechanism 10, and the winding mechanism 30 is used to wind the composite sheet body 250 and the second diaphragm 240 to form an electrode assembly 200.

[0082] The first pole piece 210 and the second pole piece 230 have opposite polarities. One of the first pole piece 210 and the second pole piece 230 is an anode piece, and the other is a cathode piece.

[0083] The composite mechanism 10 is a mechanism for pressing the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230 together so that the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230 are sequentially attached. The composite mechanism 10 may include multiple unwinding members, each of which is used to unwind the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230. The unwinding members may be, but are not limited to, rollers, reels, rotating shafts, and other structures.

[0084] The composite structure 10 also includes one or more composite components 14, and the composite component 14 includes two relatively arranged composite rollers. When the first pole piece 210, the first diaphragm 220 and the second pole piece 230 are conveyed between the two composite rollers, the two composite rollers press the first pole piece 210, the first diaphragm 220 and the second pole piece 230 together, so that the first pole piece 210, the first diaphragm 220 and the second pole piece 230 are composited to form a composite sheet body 250.

[0085] In other embodiments, the composite structure 10 may first composite the first electrode piece 210 and the first diaphragm 220 , and then composite the second electrode piece 230 with the composite first electrode piece 210 and the first diaphragm 220 , thereby forming a composite sheet 250 .

[0086] In the composite sheet 250, the first electrode piece 210, the first diaphragm 220 and the second electrode piece 230 are stacked in sequence, and both sides of the first diaphragm 220 are sticky, so that the relative positions of the first electrode piece 210, the first diaphragm 220 and the second electrode piece 230 are fixed and not easy to move relative to each other. Therefore, after the composite sheet 250 is formed, the composite sheet 250 can be inspected using a detection device. The inspection items may include: whether the first diaphragm 220 can cover the first electrode piece 210 and the second electrode piece 230, whether the composite sheet 250 has the problem of head shaking or tail shaking, etc.

[0087] At the cut point of the pole piece, the pole piece is prone to swinging. The phenomenon of the pole piece's head being offset is called "head swing", and the phenomenon of the pole piece's tail being offset is called "tail swing". In the related art, the winding device winds the first pole piece 210, the first diaphragm 220, the second pole piece 230 and the second diaphragm 240 at the winding needle 32, and uses a CCD detection mechanism for detection. The CCD detection mechanism takes pictures toward the winding needle. Due to the angle limitation, the head of the electrode assembly is difficult to be photographed by the CCD detection mechanism when winding, and the tail of the electrode assembly is also difficult to be photographed when unwinding, so that there is a detection blind spot in the detection of the electrode assembly, and it is difficult to detect the problem of pole piece head swing and tail swing. The winding device 100 provided in the embodiment of the present application completes the composite of the first pole piece 210, the second pole piece 230 and the first diaphragm 220 before the pole piece is wound, so as to facilitate all-round detection of the composite sheet 250 before winding, and can detect the problems of head swing and tail swing, without a detection blind spot.

[0088] In addition, both sides of the composite sheet 250 are pole pieces. During the process of conveying the composite sheet 250, the friction force on both sides of the composite sheet 250 along its thickness direction is consistent. When passing through the conveying roller, it is not easy for the roller to detach from the pole piece.

[0089] The membrane unwinding mechanism 20 is used to provide the second membrane 240 and unwind the second membrane 240. The membrane unwinding mechanism 20 may include a roller, or may include other structures such as a reel and a rotating shaft. The membrane unwinding mechanism 20 may be located downstream of the composite mechanism 10, or may be located on one side of the winding mechanism 30. The membrane unwinding mechanism 20 may include a passive structure, that is, other structures in the winding device 100 (such as the winding mechanism 30) pull the second membrane 240 to enable the membrane unwinding mechanism 20 to unwind and feed. The membrane unwinding mechanism 20 may also include an active structure, such as controlling the unwinding and feeding of the membrane unwinding mechanism 20 through other structures such as a motor.

[0090] The winding mechanism 30 refers to the mechanism in the winding device 100 that winds the electrode and the diaphragm. The winding mechanism 30 is located downstream of the composite mechanism 10, and the downstream refers to the area through which the composite sheet 250 passes after being output from the composite mechanism 10. The winding mechanism 30 is spaced apart from the composite mechanism 10. Optionally, the winding mechanism 30 and the composite mechanism 10 are spaced apart in the horizontal direction, so that the winding mechanism 30 and the composite mechanism 10 can each obtain a larger layout space, which is convenient for arranging various components. The winding mechanism 30 may include a winding needle 32 for winding the composite sheet 250 and the second diaphragm 240. The winding mechanism 30 may also include a holding component, a gluing component, a blanking component, etc. for finishing processing.

[0091] The winding apparatus 100 also includes a frame, which provides a mounting environment for the laminating mechanism 10, the membrane unwinding mechanism 20, and the winding mechanism 30. The frame can be a rectangular box structure or other structures, and can be made of metal, plastic, or other materials. The frame includes a vertical plate, on which the laminating mechanism 10, the membrane unwinding mechanism 20, and the winding mechanism 30 can be mounted.

[0092] The above-mentioned winding device 100 includes a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. The composite mechanism 10 is used to press the first electrode sheet 210, the first diaphragm 220 and the second electrode sheet 230 to form a composite sheet body 250, the diaphragm unwinding mechanism 20 is used to unwind the second diaphragm 240, and the winding mechanism 30 is used to wind the composite sheet body 250 and the second diaphragm 240 to form an electrode assembly 200. The above-mentioned winding device 100 first combines the first electrode piece 210, the first diaphragm 220 and the second electrode piece 230 into a composite sheet body 250, and then winds the composite sheet body 250 and the second diaphragm 240 on the winding mechanism 30. The composite mechanism 10 and the winding mechanism 30 of the winding device 100 can be arranged at intervals, and each can obtain a larger space. Moreover, the winding device 100 does not need to feed the cathode electrode piece, the anode electrode piece and the diaphragm to the winding mechanism 30 separately, which solves the problem of crowded space above the winding mechanism 30, optimizes the layout of the winding device 100, and is conducive to the flexible arrangement of various components. In addition, since the composite mechanism 10 presses the first electrode piece 210, the first diaphragm 220 and the second electrode piece 230 to form the composite sheet body 250, the composite sheet body 250 can be inspected before entering the winding mechanism 30, and the problem of head and tail swinging can be detected, which solves the problem of blind spots in the detection of the electrode assembly 200 after winding at the winding mechanism 30.

[0093] In some embodiments, referring to FIG. 1 , the winding device 100 further includes a first detection device 41 . The first detection device 41 is disposed between the composite mechanism 10 and the winding mechanism 30 . The first detection device 41 is used to detect the composite sheet 250 .

[0094] The first detection device 41 may include a camera, a machine vision detection device or other structures. The camera is, for example, a CCD camera. The first detection device 41 may also include other components such as a controller. The first detection device 41 can obtain image information (such as position, color, shape, etc.) of the relative electrode, diaphragm, composite sheet 250 or electrode assembly 200, and can convert the image information into a digital signal and send it to the controller, so that the controller can determine whether the electrode, diaphragm, composite sheet 250 or electrode assembly 200 meets the requirements according to a preset program.

[0095] The first detection device 41 is arranged between the compounding mechanism 10 and the winding mechanism 30. The first detection device 41 is arranged at this position to detect the state of the composite sheet 250 after being compounded by the compounding mechanism 10. The composite sheet 250 can be transported straight. The first detection device 41 can more comprehensively detect the state of the entire composite sheet 250 passing through, and the detection result can have a higher accuracy.

[0096] In the related art, the winding device 100 winds the electrode and the diaphragm at the winding needle 32, which makes it difficult for the head and tail of the electrode and the diaphragm entering the winding needle 32 to be detected by the detection device; in this embodiment, the winding device 100 includes a first detection device 41 arranged between the composite mechanism 10 and the winding mechanism 30. The positions of the electrode and the diaphragm in the composite sheet body 250 are relatively fixed and not easy to shift, and the detection result is more accurate. At the same time, arranging the first detection device 41 upstream of the winding mechanism 30 can more comprehensively detect the electrode assembly 200, reduce the detection blind area, and improve the detection accuracy.

[0097] In some embodiments, referring to Figure 1, the composite mechanism 10 includes a first unwinding roller 11, a second unwinding roller 12, a third unwinding roller 13 and a composite component 14. The first unwinding roller 11 is used to unwind the first electrode piece 210, the second unwinding roller 12 is used to unwind the first diaphragm 220, and the third unwinding roller 13 is used to unwind the second electrode piece 230; the composite component 14 is used to composite the first electrode piece 210, the first diaphragm 220 and the second electrode piece 230.

[0098] When the winding device 100 is in the initial state, the first pole piece 210 is wound on the first unwinding roller 11, the first diaphragm 220 is wound on the second unwinding roller 12, and the second pole piece 230 is wound on the third unwinding roller 13. When the winding device 100 is in the working state, the first unwinding roller 11 is used to unwind the first pole piece 210, the second unwinding roller 12 is used to unwind the first diaphragm 220, and the third unwinding roller 13 is used to unwind the second pole piece 230. The composite assembly 14 is used to receive the first pole piece 210, the first diaphragm 220 and the second diaphragm 240, and to press the first pole piece 210, the first diaphragm 220 and the second pole piece 230 together.

[0099] The composite assembly 14 includes two relatively arranged composite rollers, and the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230 are conveyed between the two composite rollers. The two composite rollers cooperate with each other to apply a certain pressure to the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230 to composite the first electrode piece 210, the first diaphragm 220, and the second electrode piece 230, wherein the first diaphragm 220 is located between the first electrode piece 210 and the second electrode piece 230, and is used to isolate the first electrode piece 210 from the second electrode piece 230; the first electrode piece 210 and the second electrode piece 230 are fixed together by the adhesive on the first diaphragm 220.

[0100] The composite mechanism 10 also includes multiple conveying rollers. For example, one or more conveying rollers are provided between the first unwinding roller 11 and the composite roller to convey the first pole piece 210 on the first unwinding roller 11 to the composite component 14; one or more conveying rollers are provided between the second unwinding roller 12 and the composite roller to convey the first diaphragm 220 on the second unwinding roller 12 to the composite component 14; one or more conveying rollers are provided between the third unwinding roller 13 and the composite roller to convey the second pole piece 230 on the third unwinding roller 13 to the composite component 14.

[0101] In some embodiments, since the first diaphragm 220 needs to be positioned between the first electrode sheet 210 and the second electrode sheet 230, the second unwinding roller 12 is positioned between the first unwinding roller 11 and the third unwinding roller 13, thereby optimizing the spatial layout of the composite structure 10. It is understood that the unwinding rollers and composite assembly 14 can be flexibly arranged and are not limited to the above arrangement. Optionally, the first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are arranged in a top-down order in the height direction of the winding device 100, so that the first electrode sheet 210, the first diaphragm 220, and the second electrode sheet 230 are stacked from top to bottom. The first electrode sheet 210 can be an anode sheet, and the second electrode sheet 230 can be a cathode sheet. In the resulting composite sheet 250, the length of the anode sheet is greater than that of the cathode sheet, so that the anode sheet can cover the cathode sheet. It is understood that in other embodiments, the first electrode sheet 210 can be configured as a cathode sheet, and the second electrode sheet 230 can be configured as an anode sheet.

[0102] The composite structure 10 can composite the first pole piece 210 , the first diaphragm 220 and the second pole piece 230 at one time, and the composite method is simple and the composite efficiency is high.

[0103] In some embodiments, referring to FIG1 , a first unwinding roller 11, a second unwinding roller 12, and a third unwinding roller 13 are disposed on the infeed side of a composite assembly 14, and a winding mechanism 30 is disposed on the discharge side of the composite assembly 14. The winding apparatus 100 further includes a frame, with the first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 mounted on one side of the frame, and the winding mechanism 30 mounted on the other side of the frame.

[0104] Specifically, the winding device 100 has an unwinding area and a winding area, which are distributed in a direction parallel to the support plane of the winding device 100. The first unwinding roller 11, the second unwinding roller 12 and the third unwinding roller 13 are arranged in the unwinding area, the winding mechanism 30 is arranged in the winding area, and the composite assembly 14 is arranged between the unwinding area and the winding area.

[0105] By adopting the above technical solution, the winding device 100 separates the unwinding structure and the winding mechanism 30, which can make the functional areas more widely distributed and each have a larger space, which is conducive to the flexible arrangement of various components.

[0106] In some embodiments, referring to FIG. 1 , the winding device 100 further includes a buffer mechanism 60 , which is used to buffer the composite sheet 250 .

[0107] The cache mechanism 60 refers to a structure in the winding device 100 for temporarily storing the composite sheet 250. The cache mechanism 60 can also release the cached composite sheet 250. The cache mechanism 60 is arranged between the composite component 14 and the winding mechanism 30 for winding the composite sheet 250.

[0108] The buffer mechanism 60 may include one or more rollers, and the composite sheet 250 can pass around the one or more rollers of the buffer mechanism 60 and then enter the winding mechanism 30. The length of the composite sheet 250 buffered on the buffer mechanism 60 can be flexibly adjusted.

[0109] By adopting the above technical solution, the buffer mechanism 60 can buffer and release the composite sheet 250, so that the winding mechanism 30 can continuously obtain material supply, thereby improving the winding efficiency.

[0110] In some embodiments, the winding device 100 also includes a first electrode piece cutting device 51 and a second electrode piece cutting device 52. The first electrode piece cutting device 51 is arranged between the first unwinding roller 11 and the composite component 14, and the first electrode piece cutting device 51 is used to cut the first electrode piece 210 for slicing; the second electrode piece cutting device 52 is arranged between the third unwinding roller 13 and the composite component 14, and the second electrode piece cutting device 52 is used to cut the second electrode piece 230 for slicing.

[0111] The electrode cutting device refers to the structure used to cut the electrode in the winding device 100. The first electrode cutting device 51 and the second electrode cutting device 52 can each include a variety of cutting structures, such as a linear cutter that reciprocates along a straight line, a cam cutter that rotates around an axis, etc. The linear cutter is used in conjunction with a fixed cutter, and the linear cutter can move toward or away from the fixed cutter.

[0112] By adopting the above technical solution, the composite mechanism 10 pre-cuts the first electrode 210 and the second electrode 230 before the composite electrode, and the cache mechanism 60 can cache and release the composite sheet 250, thereby ensuring that the winding mechanism 30 is not affected in winding the electrode when the electrode is cut, thereby significantly improving the winding efficiency.

[0113] In other embodiments, the composite sheet 250 may be formed first, and then the first electrode sheet 210 , the second electrode sheet 230 and the first diaphragm 220 may be cut off simultaneously.

[0114] Please refer to Figure 1. The cache mechanism 60 includes a fixed roller 61 and a floating roller 62 arranged at intervals. The fixed roller 61 is fixed relative to the composite component 14, and the floating roller 62 can move closer to or away from the fixed roller 61 to change the length of the composite sheet 250 cached by the cache mechanism 60, wherein the movement direction of the floating roller 62 intersects with the conveying direction of the composite component 14.

[0115] The fixed roller 61 refers to the roller body in the cache mechanism 60 that is fixedly arranged relative to the composite component 14, that is, the position of the fixed roller 61 is also fixed relative to the frame; the fixed roller 61 can be a cylindrical roller body, or a prismatic roller body or a roller body of other shapes; the material of the fixed roller 61 can include plastic, metal or other materials; the fixed roller 61 can rotate relative to the frame, or it can be fixed relative to the frame; the fixed roller 61 can be a passive roller and rotate with the movement of the composite sheet 250, and the fixed roller 61 can also be an active roller and rotate by being driven by a driving device such as a motor.

[0116] The floating roller 62 refers to a roller in the cache mechanism 60 that can move relative to the fixed roller 61, that is, the position of the movable roller can be changed on the frame; the floating roller 62 can be a cylindrical roller, or a prismatic roller or a roller of other shapes; the material of the floating roller 62 can include plastic, metal or other materials; the floating roller 62 can rotate relative to the frame, or be fixed relative to the frame; the floating roller 62 can be a passive roller and rotate with the movement of the pole piece and the diaphragm, or the floating roller 62 can be an active roller and rotate by being driven by a driving device such as a motor.

[0117] The floating roller 62 can move in a direction toward and away from the fixed roller 61. When the floating roller 62 moves in a direction away from the fixed roller 61, the length of the composite sheet 250 stored in the buffer mechanism 60 increases; when the floating roller 62 moves in a direction toward the fixed roller 61, the length of the composite sheet 250 stored in the buffer mechanism 60 decreases, releasing a portion of the composite sheet 250.

[0118] The floating roller 62 can float passively or actively. In some embodiments, the floating roller 62 is activated by elastic elements such as springs and rubber strips, in which case the floating roller 62 is passively floating. In other embodiments, the floating roller 62 is activated by active power elements such as air cylinders and hydraulic cylinders, in which case the floating roller 62 is actively floating.

[0119] The number of fixed rollers 61 can be one or two or more; the number of floating rollers can be one or two or more; when the number of fixed rollers 61 and floating rollers 62 are two or more, the fixed rollers 61 and floating rollers 62 can be alternately arranged in sequence along the conveying path of the composite sheet 250.

[0120] This embodiment provides some specific structures of the cache mechanism 60, which realizes the caching and releasing effect of the composite sheet 250 through the movement of the floating roller 62. The cache mechanism 60 can adjust the length of the cache composite sheet 250 to adapt to the winding speed of the winding mechanism 30 and the speed of the pole piece cutting.

[0121] In some embodiments, referring to FIG1 , the winding mechanism 30 includes a turntable 31 and at least two winding needles 32 rotatably arranged on the turntable 31; the winding mechanism 30 has a winding station 301 and a unloading station 304 arranged at intervals along the rotation direction of the turntable 31, and the winding needle 32 can enter one of the winding station 301 and the unloading station 304 as the turntable 31 rotates.

[0122] The turntable 31 is rotatably mounted on the frame. The shape of the turntable 31 may be circular, square, or other shapes. The material of the turntable 31 may include metal, plastic, or other shapes.

[0123] The winding needle 32 refers to the structure in the winding mechanism 30 for winding the electrode assembly 200; depending on the required shape of the electrode assembly 200, the winding needle 32 can be cylindrical to form a cylindrical electrode assembly 200, or the winding needle 32 can be prismatic to form a square electrode assembly 200. It can be understood that the winding needle 32 can also be other shapes.

[0124] The winding needles 32 are disposed on the turntable 31 and can rotate relative to the turntable 31 to facilitate winding the electrode assembly 200 . There are at least two winding needles 32 . Specifically, there can be two or more winding needles 32 .

[0125] The winding station 301 is located on the side of the winding mechanism 30 close to the composite mechanism 10. The winding needle 32 receives the composite sheet 250 and the second diaphragm 240 on the winding station 301 and winds the composite sheet 250 and the second diaphragm 240 multiple times to form the electrode assembly 200.

[0126] The unloading station 304 can be located on the side of the winding mechanism 30 away from the composite mechanism 10. The unloading station 304 is provided with an unloading assembly 70. The unloading assembly 70 refers to a structure used to remove the electrode assembly 200 from the winding needle 32. The unloading assembly 70 removes the electrode assembly 200 from the winding needle 32, so that the winding needle 32 is in an idle state, thereby facilitating the movement of the idle winding needle 32 to the winding station 301 for the next winding action. The unloading assembly 70 may include a clamp, a manipulator, or other structure; in some embodiments, the unloading assembly 70 includes a clamp and a platform. The clamp is used to remove the wound electrode assembly 200 from the winding needle 32, and the platform is used to carry the electrode assembly 200 removed by the clamp so that the wound electrode assembly 200 can be obtained from the platform in subsequent processes.

[0127] The turntable 31 can rotate around its own axis to drive multiple winding needles 32 to rotate around the rotating axis of the turntable 31. In this way, the winding needles 32 can rotate from the winding station 301 to the unloading station 304 in sequence, and then rotate from the unloading station 304 to the winding station 301.

[0128] For example, two winding pins 32 are provided on the turntable 31. When one winding pin 32 is located at the winding station 301, it can wind the composite sheet 250 and the second separator 240 to form a wound electrode assembly 200. At this time, the other winding pin 32 is located at the unloading station 304 for unloading. Then, as the turntable 31 rotates, the winding pin 32 with the wound electrode assembly 200 rotates to the unloading station 304 for unloading, and the winding pin 32 that has completed unloading rotates to the winding station 301 for winding. It is understood that more than two winding pins 32 can be provided to further improve the winding efficiency of the winding mechanism 30.

[0129] The winding mechanism 30 provided in the embodiment of the present application includes a turntable 31 and at least two winding needles 32 arranged on the turntable 31. During the operation of the winding device 100, each winding needle 32 enters the corresponding workstation and performs the corresponding production process at the same time, thereby reducing the feeding waiting time of the composite sheet 250 and the second diaphragm 240 and improving the winding efficiency.

[0130] In some embodiments, referring to Figures 1 and 5, a gluing station 303 is further provided on the winding device 100. The gluing station 303 is arranged between the winding station 301 and the unloading station 304 along the rotation direction of the turntable 31. The winding needle 32 can enter one of the winding station 301, the gluing station 303 and the unloading station 304 as the turntable 31 rotates.

[0131] Along the rotation direction of the turntable 31 , the winding station 301 , the gluing station 303 , and the unloading station 304 are sequentially arranged, so that the electrode assembly 200 on the winding needle 32 is glued at the gluing station 303 after winding.

[0132] The winding mechanism 30 further includes a glue-applying roller 34 provided at the glue-applying station 303 , and the glue-applying roller 34 is used to apply glue to the tail end of the electrode assembly 200 .

[0133] The adhesive roller 34 is used to apply adhesive tape, adhesive paper or other fixing structures to the tail end of the second separator 240 to prevent the electrode assembly 200 from spreading.

[0134] By adopting the above technical solution, by setting up the glue-applying roller 34, the glue-applying roller 34 can apply glue to the tail end of the second diaphragm 240, the tail end of the second diaphragm 240 is not easy to separate from the composite sheet 250, and the electrode assembly 200 is not easy to spread out, thereby improving the stability of the fit between the second diaphragm 240 and the composite sheet 250; the winding mechanism 30 can complete the winding and gluing processes at one time, thereby improving the manufacturing efficiency of the electrode assembly 200.

[0135] In some embodiments, the winding device 100 is also provided with a finishing station 302, which is arranged between the winding station 301 and the gluing station 303 along the rotation direction of the turntable 31. The winding needle 32 can enter one of the winding station 301, the gluing station 303, the finishing station 302 and the unloading station 304 as the turntable 31 rotates.

[0136] The winding mechanism 30 further includes a finishing roller 33 disposed adjacent to the finishing station 302 . The finishing roller 33 is used to press the electrode assembly 200 to finish the electrode assembly 200 .

[0137] Along the rotation direction of the turntable 31, the finishing station 302 is located between the winding station 301 and the gluing station 303, so that the winding needle 32 can first rotate from the winding station 301 to the finishing station 302, and then rotate from the finishing station 302 to the gluing station 303. The finishing roller 33 is located adjacent to the finishing station 302. When the winding needle 32 rotates to the finishing station 302, the finishing roller 33 can apply pressure to the electrode assembly 200, causing the tail of the second separator 240 to adhere to the composite sheet 250, thereby reducing the probability of separation between the separator and the electrode sheet at the tail end of the electrode assembly 200.

[0138] The winding mechanism 30 provided in the embodiment of the present application includes a finishing roller 33 , and a plurality of winding needles 32 can rotate to the finishing roller 33 in sequence to finish the electrode assembly 200 wound on the winding needles 32 , thereby improving the stability of the bonding between the second diaphragm 240 and the composite sheet 250 .

[0139] In other embodiments, the finishing station 302 and the gluing station 303 may also be the same station.

[0140] In some embodiments, referring to FIG. 1 , there are at least four winding needles 32 , which are spaced apart along the circumference of the turntable 31 .

[0141] The number of winding needles 32 can be four or more. When the number of winding needles 32 is four, each winding needle 32 stays at the winding station 301, the finishing station 302, the gluing station 303 and the unloading station 304 respectively. As the turntable 31 rotates, the winding needle 32 moves in sequence between the winding station 301, the finishing station 302, the gluing station 303 and the unloading station 304 to complete the winding process of the electrode assembly 200.

[0142] The winding mechanism 30 provided in the embodiment of the present application includes at least four winding needles 32, and the at least four winding needles 32 correspond to the winding, tailing, gluing and unloading actions respectively. The winding needle 32 only performs one action at each workstation, shortening the time the winding needle 32 needs to stay at each workstation, and effectively improving the winding speed.

[0143] As shown in Figure 1, the winding needle 32 is retractably arranged on the turntable 31. The winding device 100 is also provided with a retraction station 305. The retraction station 305 is located between the unloading station 304 and the winding station 301 along the rotation direction of the turntable 31. The winding needle 32 can be retracted relative to the turntable 31 at the retraction station 305.

[0144] There are at least five winding needles 32 and they are spaced apart along the circumference of the turntable 31 . Different winding needles 32 can be respectively located at the winding station 301 , the finishing station 302 , the gluing station 303 , the unloading station 304 and the retracting station 305 .

[0145] The winding needle 32 can not only rotate relative to the turntable 31 , but also be retractable relative to the turntable 31 , that is, the winding needle 32 can extend outside the turntable 31 or retract below the surface of the turntable 31 .

[0146] The retraction station 305 is located between the unloading station 304 and the winding station 301 along the rotation direction of the turntable 31. Specifically, the retraction station 305 is located between the side of the winding station 301 facing away from the finishing station 302 along the rotation direction of the turntable 31 and the side of the unloading station 304 facing away from the gluing station 303 along the rotation direction of the turntable 31. When the winding needle 32 is located at the retraction station 305, it can be retracted into the frame.

[0147] The winding mechanism 30 provided in the embodiment of the present application includes at least five winding needles 32, and the at least five winding needles 32 correspond to the winding, tailing, gluing, unloading and retraction actions respectively. The winding needle 32 only performs one action at each workstation, which shortens the time the winding needle 32 needs to stay at each workstation. Moreover, multiple winding needles 32 can perform different actions at the same time, reducing the waiting time for feeding the composite sheet 250 and the second diaphragm 240, and effectively improving the winding speed.

[0148] In other embodiments, the retraction station 305 can be omitted. For example, the winding needle 32 first completes the unloading at the unloading station 304, and then the winding needle 32 completes the retraction at the unloading station 304; of course, the winding needle 32 can also be set to a structure that does not require extension.

[0149] In some embodiments, referring to Figure 1, the winding needle 32 includes two main bodies 321 rotatably arranged on the turntable 31, and the two main bodies 321 are spaced apart to form an accommodating gap 322, and the accommodating gap 322 is used for the composite sheet 250 and the second diaphragm 240 to pass through. The two main bodies 321 cooperate to wind the composite sheet 250 and the second diaphragm 240.

[0150] The winding needle 32 can be cylindrical, with the outer contour of the main body 321 being arc-shaped. A receiving gap 322 is defined between the two main bodies 321. This gap 322 can clamp the leading ends of the composite sheet 250 and the second separator 240 to secure them. Optionally, the two main bodies 321 can move toward or away from each other to facilitate clamping or releasing the composite sheet 250 and the second separator 240. The winding needle 32 can also secure the leading end of the electrode assembly 200 using other fixing structures.

[0151] During winding, the head ends of the composite sheet 250 and the second diaphragm 240 pass through the accommodating gap 322 and are wound around the two main bodies 321. The two main bodies 321 rotate simultaneously to wind the composite sheet 250 and the second diaphragm 240 together, thereby forming a wound electrode assembly 200.

[0152] An embodiment of the present application provides a structure of a winding needle 32, which includes two opposite main bodies 321 and a receiving gap 322 formed between the two main bodies 321, so that the head ends of the composite sheet 250 and the second diaphragm 240 can enter the receiving gap 322 and be fixed. After that, the winding needle 32 can rotate to wind the composite sheet 250 and the second diaphragm 240 on the winding needle 32, and the tail ends of the composite sheet 250 and the second diaphragm 240 can be located on the outside of the winding needle 32, so as to facilitate subsequent finishing processing of the tail end of the electrode assembly 200.

[0153] As shown in FIG. 1 , in some embodiments, the membrane unwinding mechanism 20 is disposed between the discharge side of the compounding mechanism 10 and the feed side of the winding mechanism 30 .

[0154] The membrane unwinding mechanism 20 is disposed downstream of the composite mechanism 10 , so that the membrane unwinding mechanism 20 can not only unwind the second membrane 240 , but also deliver the second membrane 240 and the composite sheet 250 to the winding mechanism 30 .

[0155] The membrane unwinding mechanism 20 includes a membrane unwinding roller 21 and a first conveying roller 22 . The membrane unwinding roller 21 is used to unwind the second membrane 240 . The first conveying roller 22 is used to allow the second membrane 240 to merge with the composite sheet 250 to form a superimposed sheet and convey the superimposed sheet to the winding mechanism 30 .

[0156] The diaphragm unwinding mechanism 20 includes a diaphragm unwinding roller 21 and a first conveying roller 22. The first conveying roller 22 is used for allowing the composite sheet 250 and the second diaphragm 240 to merge, so that the composite sheet 250 and the second diaphragm 240 can be stacked and form a superimposed sheet, and then the superimposed sheet is conveyed to the winding mechanism 30 for winding.

[0157] By adopting the above technical solution, the diaphragm unwinding mechanism 20 is located downstream of the composite mechanism 10, and the second pole piece 230 provided by the diaphragm unwinding mechanism 20 can be overlapped with the composite sheet 250 and rolled together. The diaphragm unwinding mechanism 20 can be spaced apart from the winding mechanism 30 to avoid the problem of crowded space above the winding mechanism 30. In addition, the winding device 100 separates each unwinding roller from the winding mechanism 30, and the layout is flexible and convenient.

[0158] In some embodiments, referring to FIG. 1 , the winding device 100 further includes a second detection device 42 . The second detection device 42 is disposed between the first conveying roller 22 and the winding mechanism 30 and is used to detect the overlapped sheets.

[0159] Since the composite sheet 250 and the second diaphragm 240 are superimposed at the first conveyor roller 22 to form a superimposed sheet, the second detection device 42 is provided downstream of the first conveyor roller 22 for detecting the superimposed sheet. The second detection device 42 may include a camera, a machine vision detection device, or other structures. The camera may be a CCD camera, etc. The second detection device 42 may also include other components such as a controller. The second detection device 42 may obtain image information (such as position, color, shape, etc.) of the superimposed sheet and convert the image information into a digital signal and send it to the controller so that the controller can determine whether the superimposed sheet meets the requirements according to a preset program, for example, whether the second diaphragm 240 is offset, whether the second diaphragm 240 can cover the first electrode 210 and the second electrode 230, etc.

[0160] By adopting the above technical solution, the second detection device 42 is disposed between the first conveying roller 22 and the winding mechanism 30 , and can fully detect the state of the superimposed sheets, and the detection result can have a high accuracy.

[0161] In some embodiments, the winding device 100 may further include a membrane composite assembly (not shown), which is disposed between the first conveying roller 22 and the winding mechanism 30 , and is used to composite the second membrane 240 with the composite sheet 250 .

[0162] The membrane composite assembly can be located upstream or downstream of the first conveyor roller 22. The membrane composite assembly can include two opposing composite rollers that apply pressure to the second membrane 240 and composite sheet 250 to composite the second membrane 240 and composite sheet 250. In this way, the second membrane 240 and composite sheet 250 can be pre-combined before entering the winding mechanism 30, preventing them from shifting relative to each other.

[0163] The winding apparatus 100 may further include a third detection device (not shown) located downstream of the membrane composite assembly to detect the state of the second membrane 240 after being composited with the composite sheet 250. The third detection device can also detect head and tail swing. It is understood that the third detection device can also be omitted, in which case the second detection device 42 can be located between the membrane composite assembly and the winding mechanism 30.

[0164] It can be understood that the winding device 100 may further include a fourth detection device (not shown) arranged toward the winding station 301, and the fourth detection device is used to detect the state of the electrode assembly 200 after winding.

[0165] In other embodiments, the membrane composite assembly may be omitted, that is, there is no need to composite the second membrane 240 with the composite sheet 250 before rolling.

[0166] Please refer to FIG. 1 . The winding device 100 further includes a membrane cutting mechanism 80 . The membrane cutting mechanism 80 is disposed adjacent to the winding mechanism 30 and is used to cut the first membrane 220 and / or the second membrane 240 .

[0167] Since the first diaphragm 220 and the second diaphragm 240 are both fed in continuous coils, after the first diaphragm 220 and the second diaphragm 240 are superimposed on the first electrode piece 210 and the second electrode piece 230, the diaphragm cutting mechanism 80 is required to cut the first diaphragm 220 and the second diaphragm 240.

[0168] The number of diaphragm cutting mechanisms 80 can be one, in which case the diaphragm cutting mechanism 80 simultaneously cuts off the first diaphragm 220 and the second diaphragm 240 ; the number of diaphragm cutting mechanisms 80 can also be at least two, in which case one diaphragm cutting mechanism 80 is used to cut off the first diaphragm 220 , and the other diaphragm cutting mechanism 80 is used to cut off the second diaphragm 240 .

[0169] The diaphragm cutting mechanism 80 is provided at the winding mechanism 30 , so that the diaphragm cutting mechanism 80 can cut the diaphragms before or after the first diaphragm 220 and the second diaphragm 240 are wound. The specific position of the diaphragm cutting mechanism 80 can be flexibly set.

[0170] The diaphragm cutting mechanism 80 may include a variety of cutting structures, such as a linear cutter that reciprocates along a straight line, a cam cutter 81 that rotates around an axis, a laser cutting structure, and the like.

[0171] The winding device 100 provided in the embodiment of the present application includes a diaphragm cutting mechanism 80, which is arranged adjacent to the winding mechanism 30, so that the winding device 100 can cut the diaphragm before or after the electrode assembly 200 is wound, without wasting time on separate diaphragm cutting, thereby improving the overall winding efficiency.

[0172] 1 , in some embodiments, along the rotation direction of the turntable 31 , the film cutting mechanism 80 is disposed between the winding station 301 and the unloading station 304 .

[0173] Optionally, along the rotation direction of the turntable 31 , the diaphragm cutting mechanism 80 is located between the winding station 301 and the finishing station 302 , so that after the diaphragm cutting mechanism 80 cuts the first diaphragm 220 and / or the second diaphragm 240 , the electrode assembly 200 can be finished at the finishing station 302 .

[0174] In the first embodiment, the first and second separators 220, 240 have not yet been cut at the winding station 301. The winding needle 32 drives the electrode assembly 200 from the winding station 301 to the finishing station 302, where the separator cutting mechanism 80 cuts the first and second separators 220, 240 from the electrode assembly 200 together. In other embodiments, one of the first and second separators 220, 240 can be cut before winding. In this case, the separator cutting mechanism 80, located between the winding station 301 and the unwinding station 304, can cut the other of the first and second separators 220, 240.

[0175] Optionally, the diaphragm cutting mechanism 80 includes a linear cutter and a fixed cutter. The linear cutter can move toward the fixed cutter to cut the diaphragm; the linear cutter can move away from the fixed cutter to reset.

[0176] By adopting the above technical solution, the diaphragm cutting mechanism 80 can cut the first diaphragm 220 and / or the second diaphragm 240 after the electrode assembly 200 is completed, so as to facilitate the completion of the electrode assembly 200. In addition, the diaphragm cutting mechanism 80 is located between the winding station 301 and the unloading station 304, and there is no need to consume separate diaphragm cutting time. The winding efficiency of the winding device 100 is relatively high.

[0177] Please refer to Figure 2. The second embodiment of the present application provides a winding device 100, including a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. Different from the first embodiment, the diaphragm cutting mechanism 80 is located on the feed side of the winding mechanism 30. The winding device 100 also includes a conveying member 90 arranged between the diaphragm cutting mechanism 80 and the winding mechanism 30. The conveying member 90 is used to transfer the first diaphragm 220 and / or the second diaphragm 240 to the winding mechanism 30.

[0178] In the second embodiment, the diaphragm unwinding mechanism 20 is arranged downstream of the composite mechanism 10. The diaphragm unwinding mechanism 20 includes a diaphragm unwinding roller 21 and a first conveying roller 22. The diaphragm unwinding roller 21 is used to unwind the second diaphragm 240, and the first conveying roller 22 is used to allow the second diaphragm 240 to merge with the composite sheet 250 to form a superimposed sheet.

[0179] The diaphragm cutting mechanism 80 is located upstream of the winding mechanism 30. The diaphragm cutting mechanism 80 can cut the first diaphragm 220 and the second diaphragm 240 before the overlapping sheets are rolled up. The diaphragm cutting mechanism 80 may include a variety of cutting structures, such as a linear cutter that reciprocates along a straight line, a cam cutter 81 that rotates around an axis, a laser cutting structure, etc.

[0180] In this embodiment, the conveyor 90 is used not only to convey the first and second separators 220 and 240, but also to convey the first and second electrode sheets 210 and 230. Specifically, the conveyor 90 is used to convey the laminated sheets from the separator cutting mechanism 80 to the winding needle 32 of the winding station 301. The conveyor 90 may include various conveying structures, such as grippers and conveyor belts. The conveyor 90 may also convey the composite sheet 250 or the second separator 240, and is not limited to conveying laminated sheets.

[0181] After the current winding needle 32 winds the electrode assembly 200, the diaphragm cutting mechanism 80 cuts the first diaphragm 220 and the second diaphragm 240, and the conveyor 90 conveys the head end of the next electrode assembly 200 to the unloaded winding needle 32 of the winding station 301, so that the winding needle 32 can wind the next electrode assembly 200.

[0182] The diaphragm cutting mechanism 80 provided in the embodiment of the present application is arranged on the feed side of the winding mechanism 30, and uses the conveying member 90 to convey the diaphragm or sheet to the winding mechanism 30, so that the winding mechanism 30 can wind the electrode assembly 200. By adopting the above technical solution, the diaphragm cutting mechanism 80 does not need to avoid the winding needle 32, which is conducive to simplifying the structure of the equipment; the winding device 100 can convey the membrane at the same time as cutting the membrane, which significantly improves the winding efficiency compared to the method of cutting the membrane first and then conveying the membrane.

[0183] In other embodiments, the conveying member 90 may be omitted. For example, the diaphragm cutting mechanism 80 is adjacent to the winding station 301 , and the cut diaphragm can be directly fixed and wound by the winding needle 32 .

[0184] In some embodiments, the conveying member 90 is a vacuum adsorption conveying belt.

[0185] A vacuum transfer belt is a belt that can vacuum-hold a diaphragm. Connected to a vacuum pump, it features vacuum holes on its surface. These holes absorb the diaphragm, preventing it from warping or shifting during transport. In addition to holding the diaphragm, the belt can also absorb impurities such as debris and dust, minimizing any negative impacts on the diaphragm and the processing environment.

[0186] During operation, after the cam cutter 81 cuts off the membrane, the conveying part 90 conveys the head diaphragm of the electrode assembly 200 to the winding needle 32. For example, the head of the diaphragm falls vertically and enters the accommodating gap 322. The winding needle 32 can clamp the head diaphragm through the accommodating gap 322 and then start winding. The conveying part 90 can also convey the tail diaphragm of the electrode assembly 200 to the winding needle 32, and then the tail diaphragm can be wound through the winding roller 33.

[0187] The conveying member 90 in the embodiment of the present application is a vacuum adsorption conveying belt, which can improve the stability of conveying the film and reduce the probability of the film being tilted or deviated during the conveying process.

[0188] In some embodiments, the conveying speed of the vacuum adsorption conveyor belt is equal to the winding speed of the winding needle 32 at the winding station 301 .

[0189] The winding speed of the winding needle 32 refers to the speed at which the winding needle 32 winds the electrode assembly 200 at the winding station 301. This speed is the ratio of the length of the electrode assembly 200 to the winding time, representing the length of the membrane wound by the winding needle 32 per unit time. The conveying speed of the vacuum conveyor belt is the length of membrane it conveys per unit time. By setting the conveying speed of the vacuum conveyor belt equal to the winding speed of the winding needle 32, the membrane tension is kept at zero, reducing the probability of membrane deformation due to excessive tension. Furthermore, the vacuum conveyor belt offers a faster transmission speed and higher transmission efficiency.

[0190] It is understandable that the conveying speed of the vacuum adsorption transmission belt and the winding speed of the winding needle 32 may also be different, as long as the two are adapted to keep the tension of the diaphragm within a certain range.

[0191] 2 , in some embodiments, the diaphragm cutting mechanism 80 includes a cam cutter 81 and a cutter holder 82 disposed opposite to each other. The cam cutter 81 can rotate relative to the cutter holder 82 and cooperate with the cutter holder 82 to cut the first diaphragm 220 and / or the second diaphragm 240 .

[0192] The cam cutter 81 refers to the structure in the diaphragm cutting mechanism 80 for cutting the diaphragm; the cam cutter 81 can act intermittently and cut the diaphragm, and the length of the cut diaphragm can be adjusted by adjusting the time between two adjacent cuts by the cam cutter 81; the cam cutter 81 has the advantages of higher efficiency, higher precision, more precise intermittent indexing action, and more stable rotation, and can more accurately achieve periodic interval cutting of the diaphragm.

[0193] The knife seat 82 refers to the structure in the diaphragm cutting mechanism 80 that supports the cam cutter 81. The diaphragm can pass between the knife seat 82 and the cam cutter 81. When the cam cutter 81 cuts the diaphragm, it can press the diaphragm onto the knife seat 82 and cut it. The material of the knife seat 82 can include plastic, metal or other materials.

[0194] The knife holder 82 can be a rectangular thin plate structure, a cylindrical structure or other structure; the knife holder 82 can be fixedly connected to the housing, or can be rotatably connected to the housing to reduce the friction between the diaphragm and the knife holder 82; in some embodiments, the knife holder 82 is a roller structure rotatably connected to the housing, and the cam cutter 81 can press the diaphragm against the roller structure and cut the diaphragm when cutting the diaphragm.

[0195] Since the cam cutter 81 can perform cutting action periodically, the rotation period of the cam cutter 81 can be determined according to the length and linear velocity of the diaphragm during use, so that the cam cutter 81 can cut the diaphragm without deceleration.

[0196] The periodic interval cutting of the cam cutter 81 can be achieved through a variety of structures; for example, the cam cutter 81 may include a driving device, a cam, a rocker arm and a cutter, and the driving device drives the cam to rotate and drives the rocker arm to move back and forth, so that the cutter intermittently cuts the diaphragm; for another example, the cam cutter 81 can also be through a driving device, a crank slider mechanism and a cutter, and the driving device drives the driving slider mechanism to move, thereby driving the cutter to reciprocate through the crank slider mechanism; it can be understood that the periodic interval cutting action of the cam cutter 81 can also be achieved through other structures, and is not limited to the above two types.

[0197] As shown in FIG2 , in some embodiments, the cam cutter 81 cuts the first diaphragm 220 and the second diaphragm 240 . In other embodiments, the membrane to be cut may be only the first diaphragm 220 or the second diaphragm 240 , or the membrane to be cut may include both the diaphragm and the pole piece.

[0198] The diaphragm cutting mechanism 80 provided in this embodiment includes a cam cutter 81 and a cutter seat 82. The cam cutter 81 can perform cutting action periodically and intermittently. The length of the diaphragm can be controlled by controlling the intermittent duration of the cam cutter 81. The intermittent indexing action of the cam cutter 81 has high accuracy, and the cam cutter 81 can cut the diaphragm without deceleration, further improving the winding efficiency.

[0199] In order to cut the diaphragm without slowing it down, the duration of the rotation cycle of the cam cutter 81 can be set to be related to the length of the diaphragm to be cut and the transmission line speed.

[0200] In some embodiments, the rotation cycle length of the cam cutter 81 is equal to the ratio of the length of the first diaphragm 220 in the electrode assembly 200 to the transmission line speed of the first diaphragm 220; and / or, the rotation cycle length of the cam cutter 81 is equal to the ratio of the length of the second diaphragm 240 in the electrode assembly 200 to the transmission line speed of the second diaphragm 240.

[0201] The rotation cycle length of the cam cutter 81 is the time it takes for the cam cutter 81 to rotate one circle; the membrane to be cut may be the first diaphragm 220 and / or the second diaphragm 240. By cutting the first diaphragm 220 and / or the second diaphragm 240, a first diaphragm 220 and / or a second diaphragm 240 of a preset length can be formed in the electrode assembly 200; the transmission line speed of the membrane to be cut refers to the transmission line speed of the membrane to be cut before it enters the winding mechanism 30.

[0202] Taking Figure 2 as an example, the first diaphragm 220 and the second diaphragm 240 are conveyed toward the winding mechanism 30 at the same time and have the same transmission line speed. The lengths of the first diaphragm 220 and the second diaphragm 240 in the electrode assembly 200 can be equal or unequal. For example, the length of the first diaphragm 220 in the electrode assembly 200 is greater than the length of the second diaphragm 240. Then, the rotation cycle length of the cam cutter 81 is equal to the ratio of the length of the first diaphragm 220 in the electrode assembly 200 to the transmission line speed of the first diaphragm 220.

[0203] By meeting the above conditions, the cam cutter 81 can rotate continuously. Since the cam cutter 81 does not need to stop, the time waiting for cutting is saved; the cam cutter 81 can cut the diaphragm to be cut every time it rotates one circle. There is no need to reduce the transmission line speed of the diaphragm in order to cut the diaphragm, and the diaphragm can be cut without deceleration, which effectively improves the overall winding speed.

[0204] In other embodiments, if the cam cutter 81 needs to move toward the cutter seat 82 after rotating, the rotation cycle of the cam cutter 81 may also be less than the ratio of the length of the film to be cut to the transmission line speed of the film to be cut.

[0205] Please refer to Figure 3. The third embodiment of the present application provides a winding device 100, including a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. Different from the first embodiment, the diaphragm unwinding mechanism 20 is arranged on one side of the winding mechanism 30. The diaphragm unwinding mechanism 20 is used to transfer the second diaphragm 240 to the winding needle 32 located at the winding station 301. The composite sheet 250 and the second diaphragm 240 converge on the winding needle 32 of the winding station 301.

[0206] In the third embodiment, the membrane unwinding mechanism 20 directly delivers the second membrane 240 to the winding mechanism 30 , so that the composite sheet 250 delivered by the composite mechanism 10 and the second membrane 240 delivered by the membrane unwinding mechanism 20 are wound together.

[0207] By adopting the above technical solution, the diaphragm unwinding mechanism 20 can directly deliver the second diaphragm 240 to the winding device 100, and the winding needle 32 located at the winding station 301 can wind the composite sheet 250 and the second diaphragm 240 together to form the electrode assembly 200.

[0208] As shown in FIG3 , the membrane cutting mechanism 80 is located between the winding station 301 and the finishing station 302 along the rotation direction of the turntable 31 . The membrane cutting mechanism 80 can cut the first membrane 220 and the second membrane 240 simultaneously.

[0209] Please refer to Figure 4. The fourth embodiment of the present application provides a winding device 100, including a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. The diaphragm unwinding mechanism 20 is arranged on one side of the winding mechanism 30. The winding needle 32 is used for winding the second diaphragm 240 and the composite sheet 250 together to form a superimposed sheet. Compared with the third embodiment, the diaphragm cutting mechanism 80 in the winding device 100 is different.

[0210] In the fourth embodiment, a membrane cutting mechanism 80 is disposed on the feed side of the winding mechanism 30. Two membrane cutting mechanisms 80 are provided: one membrane cutting mechanism 80 is disposed between the laminating mechanism 10 and the winding mechanism 30 and is used to cut the first membrane 220; the other membrane cutting mechanism 80 is disposed between the membrane unwinding mechanism 20 and the winding mechanism 30 and is used to cut the second membrane 240. The winding apparatus 100 also includes two conveying members 90, each disposed between a corresponding membrane cutting mechanism 80 and the winding mechanism 30. One conveying member 90 is used to convey the composite sheet 250, and the other conveying member 90 is used to convey the second membrane 240. The membrane cutting mechanism 80 may include a cam cutter 81, or may include a cutter that reciprocates in a straight line, a laser cutter, or the like.

[0211] By adopting the above technical solution, the first diaphragm 220 and the second diaphragm 240 are both cut before being wound, the diaphragm cutting mechanism 80 does not occupy the space of the winding mechanism 30, and there is no need to avoid the winding needle 32 rotating with the turntable 31.

[0212] Please refer to Figure 1. The winding device 100 provided in the first embodiment of the present application includes a composite mechanism 10, a diaphragm unwinding mechanism 20 and a winding mechanism 30. The composite mechanism 10 includes a first unwinding roller 11, a second unwinding roller 12, a third unwinding roller 13, and a composite component 14. The winding device 100 also includes a first electrode cutting device 51, a second electrode cutting device 52 and a cache mechanism 60. The first unwinding roller 11, the second unwinding roller 12 and the third unwinding roller 13 are arranged on the feed side of the composite component 14, the winding mechanism 30 is arranged on the discharge side of the composite component 14, and the cache mechanism 60 is arranged downstream of the composite component 14; the diaphragm unwinding mechanism 20 is arranged downstream of the composite mechanism 10, and the winding mechanism 30 includes a turntable 31 and a plurality of winding needles 32; the diaphragm cutting mechanism 80 is arranged between the winding station 301 and the unloading station 304.

[0213] The working principle of the winding device 100 is as follows:

[0214] The first pole piece 210, the second pole piece 230 and the first diaphragm 220 are unwound, and the first pole piece 210 and the second pole piece 230 wrap the first diaphragm 220 in the middle and are compounded together through the compound component 14 to form a composite sheet 250. The first detection device 41 is used to detect whether the composite sheet 250 has defects. During the subsequent transmission and winding, the first pole piece 210, the second pole piece 230 and the first diaphragm 220 will not shift relative to each other; then, after the composite sheet 250 passes through the buffer mechanism 60, it is merged with the second diaphragm 240 to form a laminated sheet. The second detection device 42 detects whether the laminated sheet has defects, which can guide the diaphragm to correct the deviation.

[0215] After the first winding needle 32 winds the electrode assembly 200, the remaining first diaphragm 220 and second diaphragm 240 are not wound. At this time, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the winding roller 33, and the diaphragm cutting mechanism 80 cuts off the tail diaphragm. The winding roller 33 presses the diaphragm to wind and finish. After winding, it continues to rotate along the circumferential direction of the turntable 31 to the glue roller 34. The glue roller 34 sticks the finishing glue on the electrode assembly 200 to ensure that the diaphragm does not fall apart. Then the winding needle 32 rotates along the circumferential direction of the turntable 31 to the unloading station 304, and the unloading structure clamps the electrode assembly 200 for unloading. Then the winding needle 32 rotates along the circumferential direction of the turntable 31 to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the top winding station 301, and the winding needle 32 extends, and the electrode is fed in and wound, and this cycle is repeated.

[0216] 2 , a winding device 100 provided in a second embodiment of the present application includes a compounding mechanism 10 , a diaphragm unwinding mechanism 20 and a winding mechanism 30 . The composite mechanism 10 includes a first unwinding roller 11, a second unwinding roller 12, a third unwinding roller 13, and a composite component 14. The winding device 100 also includes a first pole piece cutting device 51, a second pole piece cutting device 52 and a cache mechanism 60. The first unwinding roller 11, the second unwinding roller 12 and the third unwinding roller 13 are arranged on one side of the winding device 100, the winding mechanism 30 is arranged on the other side of the winding device 100, the cache mechanism 60 is arranged downstream of the composite component 14, the diaphragm unwinding mechanism 20 is arranged downstream of the composite mechanism 10, the winding mechanism 30 includes a turntable 31 and a plurality of winding needles 32, the diaphragm cutting mechanism 80 is located upstream of the winding mechanism 30, the diaphragm cutting mechanism 80 includes a cam cutter 81 and a knife seat 82, and the winding device 100 also includes a vacuum adsorption transmission belt arranged between the diaphragm cutting mechanism 80 and the winding mechanism 30.

[0217] The working principle of the winding device 100 is as follows:

[0218] The first pole piece 210, the second pole piece 230 and the first diaphragm 220 are unwound, and the first pole piece 210 and the second pole piece 230 wrap the first diaphragm 220 in the middle and are compounded together through the compound component 14 to form a composite sheet 250. The composite sheet 250 is detected by the first detection device 41. During the subsequent transmission and winding, the first pole piece 210, the second pole piece 230 and the first diaphragm 220 will not shift relative to each other; then, after the composite sheet 250 passes through the buffer mechanism 60, it is merged with the second diaphragm 240 to form a laminated sheet. The second detection device 42 detects the laminated sheet to guide the diaphragm to correct the deviation.

[0219] Next, the cam cutter 81 cuts off the first diaphragm 220 and the second diaphragm 240 without reducing the transmission speed of the diaphragm; the tail diaphragm of the previous electrode assembly 200 is transferred to the winding needle 32 by the vacuum adsorption conveyor belt, and the head diaphragm of the next electrode assembly 200 is transferred to the winding needle 32 by the vacuum adsorption conveyor belt. Then, after the first winding needle 32 is wound, the remaining tail diaphragm is not wound. At this time, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the tail roller 33, and the tail roller 33 is wound. The diaphragm is pressed to finish winding, and after winding, it continues to move along the circumferential direction of the turntable 31 to the glue roller 34. The glue roller 34 applies finishing glue to the electrode assembly 200 to ensure that the diaphragm does not fall apart. Then the winding needle 32 moves to the unloading station 304, and the unloading assembly 70 clamps the electrode assembly 200 for unloading. Then the winding needle 32 rotates to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 moves to the top winding station 301, and the winding needle 32 extends, and the electrode is fed into the material and wound, and this cycle is repeated.

[0220] Please refer to Figure 3. The third embodiment of the present application provides a winding device 100. Different from the first embodiment, the diaphragm unwinding mechanism 20 is arranged on one side of the winding mechanism 30, and the winding needle 32 on the winding station 301 is used for the second diaphragm 240 and the composite sheet 250 to merge.

[0221] The working principle of the winding device 100 is as follows:

[0222] The first electrode piece 210, the second electrode piece 230 and the first diaphragm 220 are unwound, and the first electrode piece 210 and the second electrode piece 230 wrap the first diaphragm 220 in the middle and are compounded together through the compound component 14 to form a composite sheet 250. The composite sheet 250 is detected by the first detection device 41; then, the composite sheet 250 and the second diaphragm 240 are respectively fed into the winding needle 32. After the first winding needle 32 is wound, the remaining tail diaphragm is not wound. At this time, the winding needle 32 moves to the tail roller 33, and the diaphragm cutting machine The structure 80 cuts off the tail diaphragm, and the tail roller 33 presses the diaphragm to wind the tail, then the winding needle 32 moves to the glue roller 34, and the glue roller 34 applies the tail glue to the electrode assembly 200 to ensure that the diaphragm does not fall apart, then the winding needle 32 moves to the unloading station 304, and the unloading assembly 70 clamps the electrode assembly 200 for unloading, and then the winding needle 32 rotates to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 moves to the top winding station 301, and the winding needle 32 extends, and the electrode is fed into the material and wound, and this cycle is repeated.

[0223] Referring to FIG. 4 , a fourth embodiment of the present application provides a winding device 100. Unlike the third embodiment, two membrane cutting mechanisms 80 are provided. One membrane cutting mechanism 80 is disposed between the laminating mechanism 10 and the winding mechanism 30 and is used to cut the first membrane 220. The other membrane cutting mechanism 80 is disposed between the membrane unwinding mechanism 20 and the winding mechanism 30 and is used to cut the second membrane 240. The winding device 100 also includes two conveying members 90, each of which is disposed between the membrane cutting mechanism 80 and the winding mechanism 30. The membrane cutting mechanism 80 may include a cam cutter, a cutter that reciprocates in a straight line, a laser cutter, or the like.

[0224] The working principle of the winding device 100 is as follows:

[0225] The first electrode piece 210, the second electrode piece 230 and the first diaphragm 220 are unwound, and the first electrode piece 210 and the second electrode piece 230 wrap the first diaphragm 220 in the middle and are compounded together through the compound component 14 to form a composite sheet body 250, and the composite sheet body 250 is detected by the first detection device 41; then, the composite sheet body 250 and the second diaphragm 240 are respectively inserted into the winding needle 32, and the first diaphragm 220 and the second diaphragm 240 are respectively cut off by the diaphragm cutting mechanism 80 before entering the winding needle 32. The tail diaphragm of the previous electrode assembly 200 is transferred to the winding needle 32 through the vacuum adsorption transmission belt, and the head diaphragm of the next electrode assembly 200 is transferred to the winding needle 32 through the vacuum adsorption transmission belt. Then, after the first winding needle 32 is wound, the remaining tail diaphragm is not wound. At this time, the winding needle 32 turns to the tail roller 33, and the tail roller 33 presses the diaphragm to wind the tail. Then the winding needle 32 turns to the glue roller 34, and the glue roller 34 applies the tail glue to the electrode assembly 200. Then the winding needle 32 turns to the unloading station 304, and the unloading assembly 70 clamps the electrode assembly 200 for unloading. Then the winding needle 32 rotates to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 turns to the top winding station 301, and the winding needle 32 extends, and the electrode piece is fed into the material and wound, and this cycle repeats.

[0226] The second embodiment of the present application provides a battery manufacturing device, including the winding device provided in the first aspect. The battery manufacturing device can wind the electrode assembly 200 through the winding device, thereby achieving high winding efficiency and thus high manufacturing efficiency.

[0227] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A winding device, wherein, Comprising: A composite mechanism for unwinding a first pole piece, a first separator, and a second pole piece, and pressing the first pole piece, the first separator, and the second pole piece to form a composite sheet; A separator unwinding mechanism for unwinding a second separator; A winding mechanism disposed on the discharge side of the composite mechanism, the winding mechanism being used for winding the composite sheet and the second separator to form an electrode assembly.

2. The winding device according to claim 1, wherein, The winding device further includes a first detection device, the first detection device being disposed between the composite mechanism and the winding mechanism and used for detecting the composite sheet.

3. The winding device according to claim 1, wherein, The composite mechanism includes: A first unwinding roller for unwinding the first pole piece; A second unwinding roller for unwinding the first separator; A third unwinding roller for unwinding the second pole piece; A composite component for pressing the first pole piece, the first separator, and the second pole piece to form the composite sheet.

4. The winding device according to claim 3, wherein, The winding device further includes a frame, the first unwinding roller, the second unwinding roller, and the third unwinding roller are installed on one side of the frame, and the winding mechanism is installed on the other side of the frame.

5. The winding device according to claim 3 or 4, wherein The winding device further includes a buffer mechanism, the buffer mechanism is disposed between the composite component and the winding mechanism, and the buffer mechanism is used for buffering the composite sheet.

6. The winding device according to claim 5, wherein, The winding device further includes: A first pole piece cutting device disposed between the first unwinding roller and the composite component, the first pole piece cutting device being used for cutting the first pole piece; A second pole piece cutting device disposed between the third unwinding roller and the composite component, the second pole piece cutting device being used for cutting the second pole piece.

7. The winding device according to claim 5, wherein, The buffer mechanism includes a fixed roller and a floating roller arranged at intervals, the fixed roller is fixedly arranged relative to the composite component, the floating roller can approach or move away from the fixed roller to change the length of the composite sheet buffered by the buffer mechanism, wherein the moving direction of the floating roller intersects with the conveying direction of the composite component.

8. The winding device according to any one of claims 1-7, wherein, The winding mechanism includes a turntable and at least two winding needles rotatably arranged on the turntable; The winding mechanism has a winding station and a blanking station arranged at intervals along the rotation direction of the turntable, and the winding needle can rotate with the turntable into one of the winding station and the blanking station.

9. The winding device according to claim 8, wherein, A gluing station is further arranged on the winding device, the gluing station is arranged between the winding station and the blanking station along the rotation direction of the turntable, and the winding needle can rotate with the turntable into one of the winding station, the gluing station, and the blanking station.

10. The winding device according to claim 9, wherein, The winding mechanism further includes a gluing roller arranged at the gluing station, and the gluing roller is used for gluing the tail end of the electrode assembly.

11. The winding device according to claim 9, wherein, A finishing station is further arranged on the winding device, the finishing station is arranged between the winding station and the gluing station along the rotation direction of the turntable, and the winding needle can rotate with the turntable into one of the winding station, the gluing station, the finishing station, and the blanking station.

12. The winding device according to claim 11, wherein, The winding mechanism further includes a finishing roller disposed at the finishing station, and the finishing roller cooperates with the winding needle to press against the electrode assembly to finish the electrode assembly.

13. The winding device according to claim 12, wherein, There are at least four winding needles, which are circumferentially spaced along the turntable.

14. The winding device according to claim 12, wherein, The winding needles are telescopically disposed on the turntable. There is also a retraction station on the winding device. The retraction station is located between the blanking station and the winding station along the rotation direction of the turntable. The winding needles can rotate with the turntable into one of the winding station, the taping station, the finishing station, the blanking station, and the retraction station. When the winding needles enter the retraction station, the winding needles can retract relative to the turntable.

15. The winding device as claimed in claim 14, wherein, There are at least five winding needles, which are circumferentially spaced along the turntable.

16. The winding device according to any one of claims 8-15, wherein, The winding needles include two main body parts rotatably disposed on the turntable. An accommodation gap is formed between the two main body parts for the composite sheet and the second diaphragm to pass through. The two main body parts cooperate to wind the composite sheet and the second diaphragm.

17. The winding device according to any one of claims 8-16, wherein The diaphragm unwinding mechanism is disposed between the discharge side of the composite mechanism and the feed side of the winding mechanism.

18. The winding device according to claim 17, wherein, The diaphragm unwinding mechanism includes a diaphragm unwinding roller and a first conveying roller. The diaphragm unwinding roller is used to unwind the second diaphragm. The first conveying roller is used to converge the second diaphragm and the composite sheet to form a laminated sheet and convey the laminated sheet to the winding mechanism.

19. The winding device according to claim 18, wherein, The winding device further includes a second detection device disposed between the first conveying roller and the winding mechanism. The second detection device is used to detect the laminated sheet.

20. The winding device according to claim 18, wherein, The winding device further includes a diaphragm composite assembly disposed between the first conveying roller and the winding mechanism. The diaphragm composite assembly is used to composite the second diaphragm and the composite sheet.

21. The winding device according to any one of claims 8-16, wherein, The diaphragm unwinding mechanism is disposed on one side of the winding mechanism. The diaphragm unwinding mechanism is used to convey the second diaphragm to the winding needles at the winding station. The composite sheet and the second diaphragm converge on the winding needles at the winding station.

22. The winding device according to any one of claims 8-21, wherein, The winding device further includes a diaphragm cutting mechanism, which is disposed adjacent to the winding mechanism and is used to cut the first diaphragm and / or the second diaphragm.

23. The winding device according to claim 22, wherein, Along the rotation direction of the turntable, the diaphragm cutting mechanism is disposed between the winding station and the blanking station.

24. The winding device according to claim 22, wherein The diaphragm cutting mechanism is located on the feed side of the winding mechanism.

25. The winding device according to claim 24, wherein, The winding device further includes a conveyor disposed between the diaphragm cutting mechanism and the winding mechanism. The conveyor is used to convey the first diaphragm and / or the second diaphragm to the winding mechanism.

26. The winding device according to claim 25, wherein, The conveyor is a vacuum adsorption transmission belt.

27. The winding device according to claim 26, wherein, The transmission speed of the vacuum adsorption transmission belt is equal to the winding speed of the winding needles at the winding station.

28. A winding device according to any one of claims 22-27, wherein, The diaphragm cutting mechanism includes a cam cutter and a tool holder which are oppositely arranged. The cam cutter can rotate relative to the tool holder and cooperate with the tool holder to cut the first diaphragm and / or the second diaphragm.

29. The winding device according to claim 28, wherein the rotation period duration of the cam cutter is equal to the ratio of the length of the first diaphragm in the electrode assembly to the transmission line speed of the first diaphragm; and / or the rotation period duration of the cam cutter is equal to the ratio of the length of the second diaphragm in the electrode assembly to the transmission line speed of the second diaphragm.

30. A battery manufacturing device, wherein, It includes the winding device according to any one of claims 1-29.

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