Winding equipment and battery manufacturing equipment

Abstract

The invention is applicable to the technical field of battery production equipment, and provides winding equipment and battery manufacturing equipment, and the winding equipment comprises a compounding mechanism used for unwinding a first pole piece, a first diaphragm and a second pole piece, and pressing the first pole piece, the first diaphragm and the second pole piece to form a composite piece body; the diaphragm unwinding mechanism is used for unwinding a second diaphragm; and the winding mechanism is arranged on the discharging side of the compounding mechanism, and the winding mechanism is used for winding the composite sheet body and the second diaphragm to form an electrode assembly. The winding equipment is reasonable in layout, and the problem that the space above the winding mechanism is crowded is solved.

Description

[0001] Cross - reference to related applications

[0002] This application is based on and claims priority to a Chinese patent application with the application number 202410043912.0 and the filing date of January 11, 2024. The entire content of the above - mentioned Chinese patent application is incorporated herein by reference. Technical field

[0003] This application relates to the field of battery production equipment, and particularly to a winding device and a battery manufacturing device. Background art

[0004] In the production process of batteries, a winding device is required to wind electrode sheets into battery cores. Commonly used winding devices feed the cathode electrode sheet, the anode electrode sheet, and the separator separately and wind them on the winding mechanism. However, since the cathode electrode sheet, the anode electrode sheet, and the separator all converge at the feeding position of the winding mechanism for winding, the space is very crowded, which is inconvenient for arranging various components. Summary of the invention

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

[0006] The embodiments of this application propose a winding device, including:

[0007] A composite mechanism for unwinding a first electrode sheet, a first separator, and a second electrode sheet, and pressing the first electrode sheet, the first separator, and the second electrode sheet together to form a composite sheet body;

[0008] A separator unwinding mechanism for unwinding a second separator;

[0009] A winding mechanism disposed on the discharging side of the composite mechanism, and the winding mechanism is used to wind the composite sheet body and the second separator to form an electrode assembly.

[0010] The above - mentioned winding device includes a composite mechanism, a separator unwinding mechanism, and a winding mechanism. The composite mechanism is used to press a first electrode sheet, a first separator, and a second electrode sheet together to form a composite sheet body. The separator unwinding mechanism is used to unwind a second separator. The winding mechanism is used to wind the composite sheet body and the second separator to form an electrode assembly. The above - mentioned winding device first composes the first electrode sheet, the first separator, and the second electrode sheet into a composite sheet body, and then winds the composite sheet body and the second separator on the winding mechanism. The composite mechanism and the winding mechanism of the above - mentioned winding device can be arranged at intervals, and each can obtain a larger space. Moreover, the winding device does not need to supply the cathode electrode sheet, the anode electrode sheet, and the separator to the winding mechanism separately, solving the problem of crowded space above the winding mechanism, optimizing the layout of the winding device, and facilitating the flexible arrangement of various components.

[0011] 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.

[0012] By adopting the above technical solution, the winding device includes a first detection device disposed between the composite mechanism and the winding mechanism. The positions of the pole piece and the separator in the composite sheet are relatively fixed and not easily offset, and the detection result is relatively accurate. At the same time, setting 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.

[0013] In some embodiments, the composite mechanism includes:

[0014] A first unwinding roller for unwinding the first pole piece;

[0015] A second unwinding roller for unwinding the first separator;

[0016] A third unwinding roller for unwinding the second pole piece;

[0017] A composite assembly for composite the first pole piece, the first separator, and the second pole piece.

[0018] The above composite mechanism can composite the first pole piece, the first separator, and the second pole piece at one time. The composite method is simple and the composite efficiency is relatively high.

[0019] In some embodiments, the winding device further includes a frame. The first unwinding roller, the second unwinding roller, and the third unwinding roller are disposed on one side of the frame, and the winding mechanism is disposed on the other side of the frame.

[0020] By adopting the above technical solution, the winding device separates the unwinding structure and the winding mechanism, each having a larger space, which is beneficial to the flexible arrangement of each component.

[0021] In some embodiments, the winding device further includes a buffer mechanism, which is disposed between the composite assembly and the winding mechanism. The buffer mechanism is used for winding the composite sheet.

[0022] By adopting the above technical solution, the buffer mechanism can buffer and release the composite sheet, so that the winding mechanism can continuously obtain the material supply, improving the winding efficiency.

[0023] In some embodiments, the winding device further includes:

[0024] A first pole piece cutting device, which is disposed between the first unwinding roller and the composite assembly and is used to cut the first pole piece;

[0025] The second pole piece cutting device 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.

[0026] By adopting the above technical solution, the buffer mechanism can buffer and release the composite sheet, so as to ensure that the winding mechanism is not affected when cutting the pole piece, enabling the winding mechanism to continuously obtain the supply material, reducing the situation that the winding mechanism decelerates due to cutting the pole piece, and significantly improving the winding efficiency.

[0027] In some embodiments, 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, and the floating roller can approach or move away from the fixed roller to change the length of the composite sheet cached in the buffer mechanism, wherein the moving direction of the floating roller intersects with the conveying direction of the composite component.

[0028] By adopting the above technical solution, the buffer mechanism can adjust the length of the cached composite sheet to adapt to the winding speed of the winding mechanism and the cutting speed of the pole piece.

[0029] In some embodiments, the winding mechanism includes a turntable and at least two winding needles rotatably arranged on the turntable;

[0030] 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.

[0031] The winding mechanism provided by the embodiment of the present application includes a turntable and at least two winding needles arranged on the turntable. Different winding needles can sequentially rotate to the winding station for winding, reducing the feeding waiting time of the composite sheet and the second diaphragm, and improving the winding efficiency.

[0032] In some embodiments, 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.

[0033] In some embodiments, the winding mechanism further includes a gluing roller arranged at the gluing station, and the gluing roller is used to glue the tail end of the electrode assembly.

[0034] By adopting the above technical solution, the gluing roller can glue the tail end of the second diaphragm, and the tail end of the second diaphragm is not easily separated from the composite sheet, improving the stability of the bonding between the second diaphragm and the composite sheet; the winding mechanism can complete the processes of winding and gluing at one time, improving the manufacturing efficiency of the electrode assembly.

[0035] In some embodiments, a finishing station is further provided on the winding device. The finishing station is arranged between the winding station and the taping station along the rotation direction of the turntable. The winding needle can rotate with the turntable and enter one of the winding station, the taping station, the finishing station and the blanking station.

[0036] In some embodiments, the winding mechanism further includes a finishing roller disposed adjacent to the finishing station. The finishing roller cooperates with the winding needle to press against the electrode assembly to finish the electrode assembly.

[0037] By adopting the above technical solution, multiple winding needles can sequentially rotate to the finishing roller to finish the electrode assembly, improving the stability of the adhesion between the second diaphragm and the composite sheet.

[0038] In some embodiments, there are at least four winding needles and they are spaced apart along the circumferential direction of the turntable.

[0039] By adopting the above technical solution, at least four winding needles respectively correspond to the winding, finishing, taping and blanking actions. Each winding needle only performs one action at each station, shortening the time required for the winding needle to stay at each station and effectively improving the winding speed.

[0040] In some embodiments, the winding needle is telescopically disposed on the turntable. A retraction station is further provided 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 needle can rotate with the turntable and enter one of the winding station, the taping station, the finishing station, the blanking station and the retraction station. When the winding needle enters the retraction station, the winding needle can retract relative to the turntable.

[0041] By adopting the above technical solution, the winding needle can perform winding, finishing, taping, blanking and retraction actions at different stations, improving the winding speed.

[0042] In some embodiments, there are at least five winding needles and they are spaced apart along the circumferential direction of the turntable.

[0043] By adopting the above technical solution, multiple winding needles can perform different actions simultaneously, reducing the waiting time for feeding the composite sheet and the second diaphragm and effectively improving the winding speed.

[0044] In some embodiments, the winding needle includes two main body parts rotatably disposed on the turntable. A receiving gap is formed between the two main body parts. The receiving gap is 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.

[0045] By adopting the above technical solution, the leading ends of the composite sheet and the second separator can enter the accommodation gap and be fixed. Then, when the winding needle rotates, the composite sheet and the second separator can be wound around the winding needle, and the trailing ends of the composite sheet and the second separator can be located outside the winding needle, so as to facilitate subsequent finishing treatment of the trailing end of the electrode assembly.

[0046] In some embodiments, the separator unwinding mechanism is disposed between the discharging side of the composite mechanism and the feeding side of the winding mechanism.

[0047] By adopting the above technical solution, the separator unwinding mechanism is located downstream of the composite mechanism. The second electrode sheet provided by the separator unwinding mechanism can be superposed with the composite sheet and fed into the winding together. The separator unwinding mechanism can be spaced apart from the winding mechanism to avoid the problem of crowded space above the winding mechanism.

[0048] In some embodiments, the separator unwinding mechanism includes a separator unwinding roller and a first conveying roller. The separator unwinding roller is used for unwinding the second separator, and the first conveying roller is used for feeding the second separator to converge with the composite sheet to form a superposed sheet and conveying the superposed sheet to the winding mechanism.

[0049] By adopting the above technical solution, the winding equipment separates each unwinding roller from the winding mechanism, and the layout is flexible and convenient.

[0050] In some embodiments, the winding equipment further includes a second detecting device. The second detecting device is disposed between the first conveying roller and the winding mechanism, and the second detecting device is used for detecting the superposed sheet.

[0051] By adopting the above technical solution, the second detecting device is disposed between the first conveying roller and the winding mechanism, and can comprehensively detect the state of the superposed sheet, and the detection result can have a high accuracy.

[0052] In some embodiments, the winding equipment further includes a separator composite assembly. The separator composite assembly is disposed between the first conveying roller and the winding mechanism, and the separator composite assembly is used for composite the second separator with the composite sheet.

[0053] By adopting the above technical solution, the second separator and the composite sheet can be pre-composited before entering the winding mechanism and will not shift relative to each other.

[0054] In some embodiments, the separator unwinding mechanism is disposed on one side of the winding mechanism. The separator unwinding mechanism is used for conveying the second separator to the winding needle at the winding station, and the composite sheet and the second separator converge on the winding needle at the winding station.

[0055] In some embodiments, 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.

[0056] By adopting the above technical solution, the diaphragm cutting mechanism is arranged at the winding mechanism, so that the winding device can cut the diaphragm before or after the electrode assembly is wound, without consuming a separate diaphragm cutting time, and improving the overall winding efficiency.

[0057] In some embodiments, along the rotation direction of the turntable, the diaphragm cutting mechanism is disposed between the winding station and the blanking station.

[0058] 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 wound, so as to facilitate the finishing of the electrode assembly. Moreover, the diaphragm cutting mechanism is located between the winding station and the blanking station, without consuming a separate diaphragm cutting time, and the winding efficiency of the winding device is relatively high.

[0059] In some embodiments, the diaphragm cutting mechanism is located on the feeding side of the winding mechanism.

[0060] By adopting the above technical solution, the diaphragm cutting mechanism does not need to avoid the winding needle, which is beneficial to simplifying the structure of the device.

[0061] In some embodiments, the winding device further includes a conveyor disposed between the diaphragm cutting mechanism and the winding mechanism, and the conveyor is used to convey the first diaphragm and / or the second diaphragm to the winding mechanism.

[0062] By adopting the above technical solution, the winding device can convey the diaphragm while cutting the diaphragm, which significantly improves the winding efficiency compared with the method of cutting the diaphragm first and then conveying the diaphragm.

[0063] In some embodiments, the conveyor is a vacuum adsorption transmission belt.

[0064] By adopting the above technical solution, the stability of conveying the diaphragm can be improved, and the probability of the diaphragm warping or deviating during the transmission process can be reduced.

[0065] 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.

[0066] By adopting the above technical solution, the tension of the diaphragm can be zero, the probability of the diaphragm deforming due to excessive tension can be reduced, and the vacuum adsorption transmission belt has a relatively fast transmission speed and high transmission efficiency.

[0067] In some embodiments, the diaphragm cutting mechanism includes a cam cutter and a tool holder which are oppositely arranged. The cam cutter is rotatable relative to the tool holder and cooperates with the tool holder to cut the first diaphragm and / or the second diaphragm.

[0068] By adopting the above technical solution, the cam cutter can perform cutting actions periodically. During use, the rotation period of the cam cutter can be confirmed according to the length and linear velocity of the diaphragm, so that the cam cutter can cut the diaphragm without deceleration.

[0069] In some embodiments, the duration of 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 linear velocity of the first diaphragm; and / or,

[0070] the duration of the rotation period of the cam cutter is equal to the ratio of the length of the second diaphragm in the electrode assembly to the transmission linear velocity of the second diaphragm.

[0071] By meeting the above conditions, the cam cutter can rotate continuously. Since the cam cutter does not need to stop rotating, the time for waiting for cutting is saved; the cam cutter can cut the diaphragm to be cut every time it rotates one week, and there is no need to reduce the transmission linear velocity of the diaphragm in order to cut the diaphragm, realizing cutting the diaphragm without deceleration and effectively improving the overall winding speed.

[0072] This application also provides a battery manufacturing device, including a winding device.

[0073] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of conventional technologies. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0075] Figure 1 It is a schematic structural diagram of the winding device provided by the first embodiment of this application;

[0076] Figure 2 It is a schematic structural diagram of the winding device provided by the second embodiment of this application;

[0077] Figure 3 It is a schematic structural diagram of the winding device provided by the third embodiment of this application;

[0078] Figure 4 It is a schematic structural diagram of the winding device provided by the fourth embodiment of the present application;

[0079] Figure 5 It is a schematic structural diagram of the electrode assembly provided by some embodiments of the present application.

[0080] The meanings of the marks in the figure are as follows:

[0081] 100, winding device;

[0082] 10, composite mechanism; 11, first unwinding roller; 12, second unwinding roller; 13, third unwinding roller; 14, composite component;

[0083] 20, diaphragm unwinding mechanism; 21, diaphragm unwinding roller; 22, first conveying roller;

[0084] 30, winding mechanism; 31, turntable; 32, winding needle; 321, main body part; 322, accommodating gap; 33, finishing roller; 34, glue pasting roller;

[0085] 301, winding station; 302, finishing station; 303, glue pasting station; 304, blanking station; 305, retraction station;

[0086] 41, first detection device; 42, second detection device;

[0087] 51, first pole piece cutting device; 52, second pole piece cutting device;

[0088] 60, buffer mechanism; 61, fixed roller; 62, floating roller;

[0089] 70, blanking component;

[0090] 80, diaphragm cutting mechanism; 81, cam cutter; 82, tool holder;

[0091] 90, conveying member;

[0092] 200, electrode assembly; 210, first pole piece; 220, first diaphragm; 230, second pole piece; 240, second diaphragm; 250, composite sheet. Detailed implementation manners

[0093] Next, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only 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 description of the drawings are intended to cover non-exclusive inclusion.

[0095] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0096] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0097] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0098] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0099] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0100] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. 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 specific circumstances.

[0101] Currently, in the production process of batteries, winding equipment is required to wind the electrode sheets into battery cores. The commonly used winding equipment feeds the cathode electrode sheet, the anode electrode sheet, and the separator separately and winds them on the winding mechanism. However, since the cathode electrode sheet, the anode electrode sheet, and the separator all converge at the feeding place of the winding mechanism for winding, the space is very crowded, which is not convenient for the layout of each component.

[0102] To solve the problem of crowded space in the winding equipment, the present application provides a winding equipment, which includes a composite mechanism, a separator unwinding mechanism, and a winding mechanism. The composite mechanism is used to press the first electrode sheet, the first separator, and the second electrode sheet to form a composite sheet body. The separator unwinding mechanism is used to unwind the second separator. The winding mechanism is used to wind the composite sheet body and the second separator to form an electrode assembly. The above-mentioned winding equipment first composites the first electrode sheet, the first separator, and the second electrode sheet into a composite sheet body, and then winds the composite sheet body and the second separator 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, solving the problem of crowded space above the winding mechanism, optimizing the layout of the winding equipment, and facilitating the flexible arrangement of each component.

[0103] The winding equipment provided by the embodiments of the present application can be used to manufacture electrode assemblies. The electrode assemblies can be used as components that undergo electrochemical reactions in battery cells. The battery cells can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0104] An embodiment of the first aspect of the present application provides a winding equipment. Please refer to Figure 1 and Figure 5, a first embodiment of the present application provides a winding device 100, which includes a composite mechanism 10, a diaphragm unwinding mechanism 20, and a winding mechanism 30. The composite mechanism 10 is used to unwind a first pole piece 210, a first diaphragm 220, and a second pole piece 230, and press the first pole piece 210, the first diaphragm 220, and the second pole piece 230 to form a composite sheet 250; the diaphragm unwinding mechanism 20 is used to unwind a second diaphragm 240; the winding mechanism 30 is disposed on the discharge side of the composite mechanism 10, and the winding mechanism 30 is used to wind the composite sheet 250 and the second diaphragm 240 to form an electrode assembly 200.

[0105] The polarities of the first pole piece 210 and the second pole piece 230 are opposite, and one of the first pole piece 210 and the second pole piece 230 is an anode piece, and the other is a cathode piece.

[0106] The composite mechanism 10 refers to a mechanism for pressing the first pole piece 210, the first diaphragm 220, and the second pole piece 230 so that the first pole piece 210, the first diaphragm 220, and the second pole piece 230 are sequentially attached. The composite mechanism 10 may include a plurality of unwinding members, and the plurality of unwinding members are respectively used to unwind the first pole piece 210, the first diaphragm 220, and the second pole piece 230. The unwinding member may be, but is not limited to, structures such as a roller body, a reel, and a rotating shaft.

[0107] The composite mechanism 10 further includes one or more composite components 14. 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, so that the first pole piece 210, the first diaphragm 220, and the second pole piece 230 are combined to form a composite sheet 250.

[0108] In other embodiments, the composite mechanism 10 may first composite the first pole piece 210 and the first diaphragm 220, and then composite the second pole piece 230 with the already composite first pole piece 210 and first diaphragm 220, also forming a composite sheet 250.

[0109] In the composite sheet 250, the first pole piece 210, the first diaphragm 220, and the second pole piece 230 are sequentially stacked. Both sides of the first diaphragm 220 have adhesiveness, so that the relative positions of the first pole piece 210, the first diaphragm 220, and the second pole piece 230 are fixed and not easily move relative to each other. Therefore, after the composite sheet 250 is formed, a detection device can be used to detect the composite sheet 250. The detection items may include: detecting whether the first diaphragm 220 can cover the first pole piece 210 and the second pole piece 230, whether there are problems such as head or tail throwing of the composite sheet 250, etc.

[0110] At the cut-off position of the electrode tab, the electrode tab is prone to swing. The phenomenon that the head of the electrode tab deviates is called "head flicking", and the phenomenon that the tail of the electrode tab deviates is called "tail flicking". In the related art, the winding device winds the first electrode tab 210, the first separator 220, the second electrode tab 230, and the second separator 240 at the winding needle 32, and uses a CCD detection mechanism for detection. The CCD detection mechanism takes pictures towards the winding needle. Due to the angle limitation, it is difficult for the CCD detection mechanism to capture the head of the electrode assembly when feeding in, and it is also difficult to capture the tail of the electrode assembly when discharging. This makes the detection of the electrode assembly have a detection blind area, and it is very difficult to detect the problems of head flicking and tail flicking of the electrode tab. The winding device 100 provided by the embodiment of the present application pre-completes the lamination of the first electrode tab 210, the second electrode tab 230, and the first separator 220 before the electrode tab is fed in, which is convenient for comprehensively detecting the laminated sheet body 250 before feeding in, and can detect the problems of head flicking and tail flicking, without a detection blind area.

[0111] In addition, both sides of the laminated sheet body 250 are electrode tabs. During the process of transporting the laminated sheet body 250, the frictional forces on both sides of the laminated sheet body 250 in its thickness direction are the same. When passing through the conveying roller body, it is not easy for the roller body to separate from the electrode tab.

[0112] The separator unwinding mechanism 20 is used to provide the second separator 240 and unwind the second separator 240. The separator unwinding mechanism 20 may include a roller body, or may include other structures such as a reel and a rotating shaft. The separator unwinding mechanism 20 may be disposed downstream of the lamination mechanism 10, or may be disposed on one side of the winding mechanism 30. The separator unwinding mechanism 20 may include a passive structure, that is, at this time, other structures in the winding device 100 (such as the winding mechanism 30) pull the second separator 240 to make the separator unwinding mechanism 20 unwind and feed. The separator unwinding mechanism 20 may also include an active structure, such as controlling the unwinding and feeding of the separator unwinding mechanism 20 through other structures such as a motor.

[0113] The winding mechanism 30 refers to the mechanism in the winding device 100 that winds the electrode tab and the separator. The winding mechanism 30 is located downstream of the lamination mechanism 10. Downstream refers to the area that the laminated sheet body 250 passes through after being output from the lamination mechanism 10. The winding mechanism 30 and the lamination mechanism 10 are spaced apart. Optionally, the winding mechanism 30 and the lamination mechanism 10 are spaced apart in the horizontal direction, so that the winding mechanism 30 and the lamination mechanism 10 can each obtain a larger layout space, which is convenient for arranging each component. The winding mechanism 30 may include a winding needle 32 for winding the laminated sheet body 250 and the second separator 240. The winding mechanism 30 may also include a pressing member, a glue pasting member, a blanking member, etc. for finishing treatment.

[0114] The winding device 100 further includes a frame, which is used to provide an installation environment for the composite mechanism 10, the diaphragm unwinding mechanism 20, and the winding mechanism 30; the frame can be a cuboid box structure, or it can be other structures; the material of the frame can include metal, plastic, or other materials. The frame includes vertical plates, and the composite mechanism 10, the diaphragm unwinding mechanism 20, and the winding mechanism 30 can be installed on the vertical plates.

[0115] 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 pole piece 210, the first diaphragm 220, and the second pole piece 230 to form a composite sheet 250. The diaphragm unwinding mechanism 20 is used to unwind the second diaphragm 240. The winding mechanism 30 is used to wind the composite sheet 250 and the second diaphragm 240 to form an electrode assembly 200. The above-mentioned winding device 100 first composites the first pole piece 210, the first diaphragm 220, and the second pole piece 230 into a composite sheet 250, and then winds the composite sheet 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 separately supply the cathode pole piece, the anode pole piece, and the diaphragm to the winding mechanism 30, 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 each component. In addition, since the composite mechanism 10 presses the first pole piece 210, the first diaphragm 220, and the second pole piece 230 to form a composite sheet 250, before the composite sheet 250 enters the winding mechanism 30, the composite sheet 250 can be detected, and the problems of head and tail throwing can be detected, which solves the problem of detection blind spots when detecting the wound electrode assembly 200 at the winding mechanism 30.

[0116] In some embodiments, please refer to Figure 1 , the winding device 100 further includes a first detection device 41. The first detection device 41 is arranged between the composite mechanism 10 and the winding mechanism 30, and the first detection device 41 is used to detect the composite sheet 250.

[0117] The first detection device 41 can include a camera, a machine vision detection device, or other structures. The camera is, for example, a CCD camera. The first detection device 41 can also include other components such as a controller. The first detection device 41 can acquire image information (such as position, color, shape, etc.) of the opposite pole piece, 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 judge whether the pole piece, diaphragm, composite sheet 250, or electrode assembly 200 meets the requirements according to a preset program.

[0118] The first detection device 41 is disposed between the composite mechanism 10 and the winding mechanism 30. The first detection device 41 is disposed at this position to be able to detect the state of the composite sheet 250 after being composite by the composite mechanism 10. The composite sheet 250 can be conveyed flatly. 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 high accuracy.

[0119] In the related art, the winding device 100 winds the pole piece and the separator at the winding needle 32, which causes the head and tail of the pole piece and the separator entering the winding needle 32 to be not easily detected by the detection device. In this embodiment, the winding device 100 includes a first detection device 41 disposed between the composite mechanism 10 and the winding mechanism 30. The positions of the pole piece and the separator in the composite sheet 250 are relatively fixed and not easily offset, and the detection result is relatively accurate. At the same time, setting 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.

[0120] In some embodiments, please refer 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 assembly 14. 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 separator 220, and the third unwinding roller 13 is used to unwind the second pole piece 230; the composite assembly 14 is used to composite the first pole piece 210, the first separator 220, and the second pole piece 230.

[0121] When the winding device 100 is in the initial state, the first pole piece 210 is wound around the first unwinding roller 11, the first separator 220 is wound around the second unwinding roller 12, and the second pole piece 230 is wound around 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 separator 220, the third unwinding roller 13 is used to unwind the second pole piece 230, and the composite assembly 14 is used to receive the first pole piece 210, the first separator 220, and the second separator 240, and press the first pole piece 210, the first separator 220, and the second pole piece 230 together.

[0122] The composite component 14 includes two relatively arranged composite rollers. The first pole piece 210, the first separator 220, and the second pole 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 pole piece 210, the first separator 220, and the second pole piece 230 to composite the first pole piece 210, the first separator 220, and the second pole piece 230. The first separator 220 is located between the first pole piece 210 and the second pole piece 230 and is used to isolate the first pole piece 210 and the second pole piece 230. The first pole piece 210 and the second pole piece 230 are fixed together by the adhesive on the first separator 220.

[0123] The composite mechanism 10 further includes a plurality of 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 separator 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.

[0124] In some embodiments, since the first separator 220 needs to be arranged between the first pole piece 210 and the second pole piece 230, and the second unwinding roller 12 is located between the first unwinding roller 11 and the third unwinding roller 13, the spatial layout of the composite mechanism 10 is relatively reasonable. It can be understood that each unwinding roller and the composite component 14 can be flexibly arranged, not limited to the above arrangement. Optionally, in the height direction of the winding device 100, the first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are arranged from top to bottom in sequence, so that the first pole piece 210, the first separator 220, and the second pole piece 230 are stacked from top to bottom. The first pole piece 210 can be an anode piece, and the second pole piece 230 can be a cathode piece. In the formed composite sheet 250, the length of the anode piece is greater than the length of the cathode piece so that the anode piece can cover the cathode piece. It can be understood that in other embodiments, the first pole piece 210 can also be set as the cathode piece, and the second pole piece 230 can be set as the anode piece.

[0125] The above composite mechanism 10 can composite the first pole piece 210, the first separator 220, and the second pole piece 230 at one time. The composite method is simple and the composite efficiency is relatively high.

[0126] In some embodiments, please refer to Figure 1 , the first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are arranged on the feeding side of the composite component 14, and the winding mechanism 30 is arranged on the discharging side of the composite component 14. The winding device 100 further includes a frame. The first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are installed on one side of the frame, and the winding mechanism 30 is installed on the other side of the frame.

[0127] Specifically, the winding device 100 has an unwinding area and a winding area. The unwinding area and the winding area 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. The composite component 14 is arranged between the unwinding area and the winding area.

[0128] By adopting the above technical solution, the winding device 100 separates the unwinding structure and the winding mechanism 30, enabling the distribution of each functional area to be more dispersed, each having a larger space, which is beneficial to the flexible arrangement of each component.

[0129] In some embodiments, referring to Figure 1 , the winding device 100 further includes a buffer mechanism 60, and the buffer mechanism 60 is used to buffer the composite sheet 250.

[0130] The buffer mechanism 60 refers to the structure in the winding device 100 for temporarily storing the composite sheet 250. The buffer mechanism 60 can also release the composite sheet 250 it buffers. The buffer mechanism 60 is arranged between the composite component 14 and the winding mechanism 30 for winding the composite sheet 250.

[0131] The buffer mechanism 60 may include one or more rollers, and the composite sheet 250 can enter the winding mechanism 30 after bypassing one or more rollers of the buffer mechanism 60. The length of the composite sheet 250 buffered on the buffer mechanism 60 can be adjusted flexibly.

[0132] By adopting the above technical solution, the buffer mechanism 60 can buffer and release the composite sheet 250, enabling the winding mechanism 30 to continuously obtain feed, thereby improving the winding efficiency.

[0133] In some embodiments, the winding device 100 further includes a first pole piece cutting device 51 and a second pole piece cutting device 52. The first pole piece cutting device 51 is arranged between the first unwinding roller 11 and the composite component 14, and the first pole piece cutting device 51 is used to cut the first pole piece 210 for slicing. The second pole piece cutting device 52 is arranged between the third unwinding roller 13 and the composite component 14, and the second pole piece cutting device 52 is used to cut the second pole piece 230 for slicing.

[0134] The pole piece cutting device refers to the structure in the winding device 100 for cutting the pole piece. Among them, both the first pole piece cutting device 51 and the second pole piece cutting device 52 can include various cutting structures, such as a linear cutting tool that reciprocates linearly and a cam cutting tool that rotates around an axis. The linear cutting tool is used in combination with a fixed cutting tool, and the linear cutting tool can move in a direction approaching or away from the fixed cutting tool.

[0135] By adopting the above technical solution, before the composite sheet, the composite mechanism 10 cuts off the first pole piece 210 and the second pole piece 230 in advance, and the buffering mechanism 60 can buffer and release the composite sheet body 250, so as to ensure that the winding mechanism 30 is not affected when winding the pole piece, and significantly improves the winding efficiency.

[0136] In other embodiments, the composite sheet body 250 can also be formed first, and then the first pole piece 210, the second pole piece 230 and the first separator 220 are cut off simultaneously.

[0137] Please refer to Figure 1 , the buffering mechanism 60 includes a fixed roller 61 and a floating roller 62 arranged at intervals. The fixed roller 61 is fixedly arranged relative to the composite component 14. The floating roller 62 can approach or move away from the fixed roller 61 to change the length of the composite sheet body 250 buffered by the buffering mechanism 60, wherein the moving direction of the floating roller 62 intersects with the conveying direction of the composite component 14.

[0138] The fixed roller 61 refers to the roller body fixedly arranged relative to the composite component 14 in the buffering mechanism 60, 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, 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 be fixed relative to the frame; the fixed roller 61 can be a passive roller and rotate with the movement of the composite sheet body 250, and the fixed roller 61 can also be an active roller and rotate driven by a driving device such as a motor.

[0139] The floating roller 62 refers to the roller body that can move relative to the fixed roller 61 in the buffering mechanism 60, that is, the position of the movable roller can change on the frame; the floating roller 62 can be a cylindrical roller body, a prismatic roller body or a roller body 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 separator, and the floating roller 62 can also be an active roller and rotate driven by a driving device such as a motor.

[0140] The floating roller 62 can move in the direction of approaching and moving away from the fixed roller 61. When the floating roller 62 moves in the direction away from the fixed roller 61, the length of the composite sheet body 250 stored by the buffering mechanism 60 increases; when the floating roller 62 moves in the direction of approaching the fixed roller 61, the length of the composite sheet body 250 stored by the buffering mechanism 60 decreases, and part of the composite sheet body 250 is released.

[0141] The floating of the floating roller 62 can be passive floating or active floating. In some embodiments, the floating of the floating roller 62 is achieved by elastic members such as springs and rubber strips, and at this time the floating roller 62 is in passive floating; in other embodiments, the floating of the floating roller 62 is achieved by active power devices such as cylinders and hydraulic cylinders, and at this time the floating roller 62 is in active floating.

[0142] The number of the fixed rollers 61 can be one, or two or more; the number of the floating rollers can be one, or two or more; when the numbers of the fixed rollers 61 and the floating rollers 62 are both two or more, the fixed rollers 61 and the floating rollers 62 can be alternately arranged in sequence along the conveying path of the composite sheet body 250.

[0143] This embodiment provides the specific structure of some buffer mechanisms 60. The buffer and release effects of the composite sheet body 250 are realized through the movement of the floating roller 62, and the buffer mechanism 60 can adjust the length of the buffered composite sheet body 250 to adapt to the winding speed of the winding mechanism 30 and the cutting speed of the pole piece.

[0144] In some embodiments, please refer to Figure 1 , 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 blanking station 304 arranged at intervals along the rotation direction of the turntable 31, and the winding needle 32 can rotate with the turntable 31 into one of the winding station 301 and the blanking station 304.

[0145] The turntable 31 is rotatably arranged on the frame, and the shape of the turntable 31 can be circular, square or other shapes; the material of the turntable 31 can include metal, plastic or other shapes.

[0146] The winding needle 32 refers to the structure in the winding mechanism 30 for winding the electrode assembly 200; according to the required shape of the electrode assembly 200, the winding needle 32 can be cylindrical to form a cylindrical electrode assembly 200, and the winding needle 32 can also be prismatic to form a square electrode assembly 200. It can be understood that the winding needle 32 can also be other shapes.

[0147] The winding needle 32 is arranged 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.

[0148] 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 body 250 and the second separator 240 at the winding station 301 and winds the composite sheet body 250 and the second separator 240 for multiple turns to form the electrode assembly 200.

[0149] The blanking station 304 can be located on the side of the winding mechanism 30 away from the composite mechanism 10, and a blanking assembly 70 is provided at the blanking station 304. The blanking assembly 70 refers to a structure for removing the electrode assembly 200 from the winding pin 32. The blanking assembly 70 removes the electrode assembly 200 on the winding pin 32, so that the winding pin 32 is in an empty state, thereby facilitating the movement of the empty winding pin 32 to the winding station 301 for the next winding operation. The blanking assembly 70 may include a clamping jaw, a manipulator or other structures; in some embodiments, the blanking assembly 70 includes a clamping jaw and a platform. The clamping jaw is used to remove the wound electrode assembly 200 from the winding pin 32, and the platform is used to carry the electrode assembly 200 removed by the clamping jaw, so as to facilitate the subsequent process to obtain the wound electrode assembly 200 from the platform.

[0150] The turntable 31 can rotate around its own axis to drive a plurality of winding pins 32 to rotate around the axis of the turntable 31. In this way, the winding pins 32 can sequentially rotate from the winding station 301 to the blanking station 304, and then rotate from the blanking station 304 to the winding station 301.

[0151] For example, two winding pins 32 are provided on the turntable 31. When one winding pin 32 is located at the winding station 301, the winding pin 32 can wind the composite sheet 250 and the second diaphragm 240 to form a wound electrode assembly 200. At this time, the other winding pin 32 is located at the blanking station 304 for blanking; then, the turntable 31 rotates, and the winding pin 32 wound with the electrode assembly 200 rotates to the blanking station 304 for blanking, and the winding pin 32 that has completed blanking rotates to the winding station 301 for winding operation. It can be understood that the number of winding pins 32 can also be set to more than two, which can further improve the winding efficiency of the winding mechanism 30.

[0152] The winding mechanism 30 provided by the embodiment of the present application includes a turntable 31 and at least two winding pins 32 provided on the turntable 31. During the working process of the winding device 100, each winding pin 32 enters the corresponding station and simultaneously performs the corresponding production process, reducing the feeding waiting time of the composite sheet 250 and the second diaphragm 240 and improving the winding efficiency.

[0153] In some embodiments, please refer to Figure 1 、 Figure 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 blanking station 304 along the rotation direction of the turntable 31. The winding pin 32 can rotate with the turntable 31 and enter one of the winding station 301, the gluing station 303 and the blanking station 304.

[0154] Along the rotation direction of the turntable 31, the winding station 301, the taping station 303, and the blanking station 304 are arranged in sequence. Thus, after the electrode assembly 200 on the winding pin 32 is wound, taping is performed at the taping station 303.

[0155] The winding mechanism 30 further includes a taping roller 34 disposed at the taping station 303. The taping roller 34 is used to tape the tail end of the electrode assembly 200.

[0156] The taping roller 34 is used to tape fixing structures such as tapes and adhesive papers to the tail end of the second diaphragm 240 to prevent the electrode assembly 200 from coming apart.

[0157] By adopting the above technical solution, by providing the taping roller 34, the taping roller 34 can tape the tail end of the second diaphragm 240. The tail end of the second diaphragm 240 is not easily separated from the composite sheet 250, and the electrode assembly 200 is not easily scattered, improving the stability of the bonding between the second diaphragm 240 and the composite sheet 250; the winding mechanism 30 can complete the processes of winding and taping at one time, improving the manufacturing efficiency of the electrode assembly 200.

[0158] In some embodiments, the winding device 100 is further provided with a finishing station 302. The finishing station 302 is arranged between the winding station 301 and the taping station 303 along the rotation direction of the turntable 31. The winding pin 32 can rotate with the turntable 31 into one of the winding station 301, the taping station 303, the finishing station 302, and the blanking station 304.

[0159] 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 against the electrode assembly 200 to finish the electrode assembly 200.

[0160] Along the rotation direction of the turntable 31, the finishing station 302 is arranged between the winding station 301 and the taping station 303. Thus, the winding pin 32 can first rotate from the winding station 301 to the finishing station 302, and then rotate from the finishing station 302 to the taping station 303. The finishing roller 33 is disposed adjacent to the finishing station 302. When the winding pin 32 rotates to the finishing station 302, the finishing roller 33 can apply pressure to the electrode assembly 200 to make the tail of the second diaphragm 240 fit against the composite sheet 250, reducing the probability of the separation of the diaphragm and the electrode sheet at the tail end of the electrode assembly 200.

[0161] The winding mechanism 30 provided by the embodiment of the present application includes a finishing roller 33. Multiple winding pins 32 can sequentially rotate to the position of the finishing roller 33 to finish the electrode assembly 200 wound on the winding pins 32, improving the stability of the bonding between the second diaphragm 240 and the composite sheet 250.

[0162] In other embodiments, the finishing station 302 and the taping station 303 can also be the same station.

[0163] In some embodiments, referring to Figure 1 , there are at least four winding needles 32, which are circumferentially spaced along the turntable 31.

[0164] 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 blanking station 304 respectively. As the turntable 31 rotates, the winding needles 32 move between the winding station 301, the finishing station 302, the gluing station 303, and the blanking station 304 in sequence to complete the winding process of the electrode assembly 200.

[0165] The winding mechanism 30 provided by the embodiment of the present application includes at least four winding needles 32. The at least four winding needles 32 respectively correspond to the winding, finishing, gluing, and blanking actions. The winding needle 32 only performs one action at each station, shortening the time required for the winding needle 32 to stay at each station and effectively improving the winding speed.

[0166] As Figure 1 shown, the winding needle 32 is telescopically arranged on the turntable 31. There is also a retraction station 305 on the winding device 100. The retraction station 305 is located between the blanking station 304 and the winding station 301 along the rotation direction of the turntable 31. The winding needle 32 can retract relative to the turntable 31 at the retraction station 305.

[0167] There are at least five winding needles 32, which are circumferentially spaced along the turntable 31. Different winding needles 32 can be respectively at the winding station 301, the finishing station 302, the gluing station 303, the blanking station 304, and the retraction station 305.

[0168] The winding needle 32 can not only rotate relative to the turntable 31, but also be telescopic relative to the turntable 31, that is, the winding needle 32 can extend out of the outside of the turntable 31 or retract below the surface of the turntable 31.

[0169] The retraction station 305 is located between the blanking 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 along the rotation direction of the turntable 31 away from the finishing station 302 and the side of the blanking station 304 along the rotation direction of the turntable 31 away from the gluing station 303. When the winding needle 32 is at the retraction station 305, the winding needle 32 can retract into the frame.

[0170] The winding mechanism 30 provided by the embodiment of the present application includes at least five winding needles 32. The at least five winding needles 32 respectively correspond to the winding, end winding, tape sticking, blanking, and retraction actions. The winding needle 32 only performs one action at each station, shortening the residence time required by the winding needle 32 at each station. Moreover, multiple winding needles 32 can perform different actions simultaneously, reducing the waiting time for feeding the composite sheet 250 and the second separator 240, and effectively improving the winding speed.

[0171] In other embodiments, the retraction station 305 can be omitted. For example, the winding needle 32 first completes blanking at the blanking station 304, and then the winding needle 32 completes retraction at the blanking station 304. Of course, the winding needle 32 can also be configured as a structure that does not need to be telescopic.

[0172] In some embodiments, please refer to Figure 1 , the winding needle 32 includes two main body parts 321 rotatably arranged on the turntable 31. The two main body parts 321 are spaced apart to form a receiving gap 322. The receiving gap 322 is used for the composite sheet 250 and the second separator 240 to pass through. The two main body parts 321 cooperate to wind the composite sheet 250 and the second separator 240.

[0173] The winding needle 32 can be cylindrical, and the outer peripheral contour of the main body part 321 is arc-shaped. A receiving gap 322 is provided between the two main body parts 321. The receiving gap 322 can hold the leading ends of the composite sheet 250 and the second separator 240 to play a fixing role. Optionally, the two main body parts 321 can move towards or away from each other to facilitate holding or releasing the composite sheet 250 and the second separator 240. The leading end of the electrode assembly 200 can also be fixed by other fixing structures of the winding needle 32.

[0174] During winding, the leading ends of the composite sheet 250 and the second separator 240 pass through the receiving gap 322 and are wound around the two main body parts 321. The two main body parts 321 rotate simultaneously to jointly wind the composite sheet 250 and the second separator 240, thereby forming a wound electrode assembly 200.

[0175] The embodiment of the present application provides a structure of the winding needle 32. The winding needle 32 includes two opposite main body parts 321, and a receiving gap 322 is formed between the two main body parts 321, enabling the leading ends of the composite sheet 250 and the second separator 240 to enter the receiving gap 322 and be fixed. Then, when the winding needle 32 rotates, the composite sheet 250 and the second separator 240 can be wound around the winding needle 32, and the trailing ends of the composite sheet 250 and the second separator 240 can be located outside the winding needle 32, facilitating subsequent end winding processing of the trailing end of the electrode assembly 200.

[0176] Such as Figure 1As shown, in some embodiments, the diaphragm unwinding mechanism 20 is disposed between the discharge side of the laminating mechanism 10 and the feed side of the winding mechanism 30.

[0177] The diaphragm unwinding mechanism 20 is disposed downstream of the laminating mechanism 10, so that the diaphragm unwinding mechanism 20 can not only unwind the second diaphragm 240, but also convey the second diaphragm 240 and the laminated sheet 250 to the winding mechanism 30 together.

[0178] 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 and the laminated sheet 250 to converge to form a laminated body, and convey the laminated body to the winding mechanism 30.

[0179] The diaphragm unwinding mechanism 20 includes a diaphragm unwinding roller 21 and a first conveying roller 22. The first conveying roller 22 is used to allow the laminated sheet 250 and the second diaphragm 240 to converge, so that the laminated sheet 250 and the second diaphragm 240 can be stacked and arranged to form a laminated body, and then the laminated body is conveyed to the winding mechanism 30 for winding.

[0180] By adopting the above technical solution, the diaphragm unwinding mechanism 20 is located downstream of the laminating mechanism 10. The second electrode sheet 230 provided by the diaphragm unwinding mechanism 20 can be stacked with the laminated sheet 250 and fed into the roll together. The diaphragm unwinding mechanism 20 can be arranged at an interval from the winding mechanism 30 to avoid the problem of crowded space above the winding mechanism 30. Moreover, the winding device 100 separates each unwinding roller from the winding mechanism 30, and the layout is flexible and convenient.

[0181] In some embodiments, please refer to Figure 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 laminated body.

[0182] Since the laminated sheet 250 and the second diaphragm 240 are stacked at the first conveying roller 22 to form a laminated body, the second detection device 42 is disposed downstream of the first conveying roller 22 and is used to detect the laminated body. 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 further include other components such as a controller. The second detection device 42 can obtain the image information (such as position, color, shape, etc.) of the laminated body, and can convert the image information into a digital signal and send it to the controller, so that the controller can judge whether the laminated body meets the requirements according to a preset program. For example, judge whether the second diaphragm 240 is offset, whether the second diaphragm 240 can cover the first electrode sheet 210 and the second electrode sheet 230, etc.

[0183] By adopting the above technical solution, the second detection device 42 is arranged between the first conveying roller 22 and the winding mechanism 30, which can comprehensively detect the state of the laminated sheet body, and the detection result can have high accuracy.

[0184] In some embodiments, the winding device 100 may further include a diaphragm composite component (not shown in the figure), which is arranged between the first conveying roller 22 and the winding mechanism 30, and the diaphragm composite component is used to composite the second diaphragm 240 and the composite sheet body 250.

[0185] The diaphragm composite component can be located upstream or downstream of the first conveying roller 22. The diaphragm composite component may include two relatively arranged composite rollers, and the two composite rollers apply pressure to the second diaphragm 240 and the composite sheet body 250 to composite the second diaphragm 240 and the composite sheet body 250. In this way, the second diaphragm 240 and the composite sheet body 250 can be pre-composited before entering the winding mechanism 30 and will not shift relative to each other.

[0186] The winding device 100 may further include a third detection device (not shown in the figure) arranged downstream of the diaphragm composite component, which is used to detect the state after the second diaphragm 240 and the composite sheet body 250 are composited. The third detection device can also complete the detection of the head and tail swinging. It can be understood that the third detection device can also be omitted. At this time, the second detection device 42 can be arranged between the diaphragm composite component and the winding mechanism 30.

[0187] It can be understood that the winding device 100 may further include a fourth detection device (not shown in the figure) arranged towards the winding station 301, and the fourth detection device is used to detect the state of the wound electrode assembly 200.

[0188] In other embodiments, the diaphragm composite component can be omitted, that is, there is no need to composite the second diaphragm 240 and the composite sheet body 250 before winding.

[0189] Please refer to Figure 1 , the winding device 100 further includes a diaphragm cutting mechanism 80, and the diaphragm cutting mechanism 80 is arranged adjacent to the winding mechanism 30 and is used to cut the first diaphragm 220 and / or the second diaphragm 240.

[0190] Since the first diaphragm 220 and the second diaphragm 240 are supplied with continuous wound materials, after the first diaphragm 220, the second diaphragm 240 are laminated with the first pole piece 210 and the second pole piece 230, it is necessary to use the diaphragm cutting mechanism 80 to cut the first diaphragm 220 and the second diaphragm 240.

[0191] The number of the diaphragm cutting mechanisms 80 can be one. In this case, the diaphragm cutting mechanism 80 cuts the first diaphragm 220 and the second diaphragm 240 simultaneously. The number of the diaphragm cutting mechanisms 80 can also be at least two. In this case, one diaphragm cutting mechanism 80 is used to cut the first diaphragm 220, and another diaphragm cutting mechanism 80 is used to cut the second diaphragm 240.

[0192] The diaphragm cutting mechanism 80 is arranged at the winding mechanism 30, so that the diaphragm cutting mechanism 80 can cut the diaphragm 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 set flexibly.

[0193] The diaphragm cutting mechanism 80 can include various cutting structures, such as a linear cutting tool that reciprocates linearly, a cam cutting tool 81 that rotates around an axis, a laser cutting structure, etc.

[0194] The winding device 100 provided by the embodiment of the present application includes a diaphragm cutting mechanism 80. The diaphragm cutting mechanism 80 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 consuming a separate diaphragm cutting time, and improving the overall winding efficiency.

[0195] Please continue to refer to Figure 1 , in some embodiments, along the rotation direction of the turntable 31, the diaphragm cutting mechanism 80 is arranged between the winding station 301 and the blanking station 304.

[0196] 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.

[0197] In the first embodiment, the first diaphragm 220 and the second diaphragm 240 are not cut at the winding station 301. The winding needle 32 drives the electrode assembly 200 to rotate from the winding station 301 to the finishing station 302, and the diaphragm cutting mechanism 80 cuts the first diaphragm 220 and the second diaphragm 240 in the electrode assembly 200 together. In other embodiments, one of the first diaphragm 220 and the second diaphragm 240 can be cut before winding, and the diaphragm cutting mechanism 80 located between the winding station 301 and the blanking station 304 can cut the other of the first diaphragm 220 and the second diaphragm 240.

[0198] Optionally, the diaphragm cutting mechanism 80 includes a linear cutting tool and a fixed cutting tool. The linear cutting tool can move towards the fixed cutting tool to cut the diaphragm; the linear cutting tool can move away from the fixed cutting tool to reset.

[0199] 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 winding of the electrode assembly 200 is completed, so as to facilitate the finishing of the electrode assembly 200. Moreover, the diaphragm cutting mechanism 80 is located between the winding station 301 and the blanking station 304, without the need to consume separate diaphragm cutting time, and the winding efficiency of the winding device 100 is relatively high.

[0200] 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 feeding side of the winding mechanism 30, and the winding device 100 further includes a conveying member 90 disposed between the diaphragm cutting mechanism 80 and the winding mechanism 30. The conveying member 90 is used to convey the first diaphragm 220 and / or the second diaphragm 240 to the winding mechanism 30.

[0201] In the second embodiment, the diaphragm unwinding mechanism 20 is disposed 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 supply the second diaphragm 240 to converge with the composite sheet 250 to form a laminated sheet.

[0202] 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 laminated sheet enters the winding. The diaphragm cutting mechanism 80 can include various 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.

[0203] In this embodiment, the conveying member 90 is not only used to convey the first diaphragm 220 and the second diaphragm 240, but also used to convey the first pole piece 210 and the second pole piece 230, that is, the conveying member 90 is used to convey the laminated sheet from the diaphragm cutting mechanism 80 to the winding needle 32 at the winding station 301. The conveying member 90 can include various conveying structures, such as clamping jaws, conveyor belts, etc. The conveying member 90 can also convey the composite sheet 250 or the second diaphragm 240, not limited to conveying the laminated sheet.

[0204] After the previous 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 conveying member 90 conveys the head end of the next electrode assembly 200 to the empty winding needle 32 at the winding station 301, so as to facilitate the winding needle 32 to wind the next electrode assembly 200.

[0205] The diaphragm cutting mechanism 80 provided in the embodiment of the present application is arranged on the feeding side of the winding mechanism 30, and uses the conveying member 90 to convey the diaphragm or sheet to the winding mechanism 30, so as to facilitate the winding mechanism 30 to 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 beneficial to simplifying the structure of the equipment; the winding equipment 100 can convey the diaphragm while cutting the diaphragm, which significantly improves the winding efficiency compared with the method of cutting the diaphragm first and then conveying the diaphragm.

[0206] In other embodiments, the conveying member 90 can 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.

[0207] In some embodiments, the conveying member 90 is a vacuum adsorption transmission belt.

[0208] The vacuum adsorption transmission belt refers to a transmission belt with the function of vacuum-adsorbing the diaphragm. The vacuum adsorption transmission belt is connected to the vacuum pumping device. The surface of the transmission belt is provided with vacuum adsorption holes. Under the pumping action of the vacuum pumping device, the vacuum adsorption holes adsorb the diaphragm to prevent the diaphragm from warping or shifting during transmission. In addition to adsorbing the diaphragm, the vacuum adsorption transmission belt can also adsorb impurities such as debris and dust, reducing the negative impact that impurities may cause to the diaphragm and the processing environment.

[0209] During operation, after the cam cutter 81 cuts the diaphragm, the conveying member 90 conveys the head diaphragm of the electrode assembly 200 to the winding needle 32. For example, the head of the diaphragm drops vertically and enters the accommodation gap 322. The winding needle 32 can clamp the head diaphragm through the accommodation gap 322 and then start winding; the conveying member 90 can also convey the tail diaphragm of the electrode assembly 200 to the winding needle 32, and then the tail diaphragm can be finished by the finishing roller 33.

[0210] The conveying member 90 in the embodiment of the present application is a vacuum adsorption transmission belt, which can improve the stability of conveying the diaphragm and reduce the probability of the diaphragm warping or deviating during transmission.

[0211] In some embodiments, the conveying speed of the vacuum adsorption transmission belt is equal to the winding speed of the winding needle 32 at the winding station 301.

[0212] The winding speed of the winding needle 32 refers to the winding speed of the winding needle 32 on the winding station 301 for winding the electrode assembly 200, that is, the ratio of the length of the electrode assembly 200 to the winding time, representing the length of the diaphragm wound by the winding needle 32 per unit time. The conveying speed of the vacuum adsorption transmission belt is the length of the diaphragm conveyed per unit time. By setting the conveying speed of the vacuum adsorption transmission belt equal to the winding speed of the winding needle 32, the tension of the diaphragm can be made zero, reducing the probability of diaphragm deformation caused by excessive tension. Moreover, the vacuum adsorption transmission belt has a fast transmission speed and high transmission efficiency.

[0213] It can be understood that the conveying speed of the vacuum adsorption transmission belt and the winding speed of the winding needle 32 may also be unequal, as long as the two are adapted to enable the tension of the diaphragm to be within a certain range.

[0214] Please continue to refer to Figure 2 , in some embodiments, the diaphragm cutting mechanism 80 includes a cam cutter 81 and a tool holder 82 arranged opposite to each other. The cam cutter 81 can rotate relative to the tool holder 82 and cooperate with the tool holder 82 to cut the first diaphragm 220 and / or the second diaphragm 240.

[0215] The cam cutter 81 refers to the structure in the diaphragm cutting mechanism 80 for cutting the diaphragm; the cam cutter 81 can intermittently act and cut the diaphragm, and the length of the cut diaphragm can be adjusted by adjusting the time between two adjacent cuts of the cam cutter 81; the cam cutter 81 has the advantages of high efficiency, high precision, relatively accurate intermittent indexing movement, and relatively stable rotation, and can more accurately achieve periodic intermittent cutting of the diaphragm.

[0216] The tool holder 82 refers to the structure in the diaphragm cutting mechanism 80 that supports the cam cutter 81. The diaphragm can pass between the tool holder 82 and the cam cutter 81. When the cam cutter 81 cuts the diaphragm, it can press the diaphragm against the tool holder 82 and cut it; the material of the tool holder 82 can include plastic, metal or other materials.

[0217] The tool holder 82 can be a cuboid thin plate structure, a cylindrical structure or other structures; the tool holder 82 can be fixedly connected to the machine shell or rotatably connected to the machine shell to reduce the friction between the diaphragm and the tool holder 82; in some embodiments, the tool holder 82 is a roller structure rotatably connected to the machine shell, and when the cam cutter 81 cuts the diaphragm, it can press the diaphragm against the roller structure and cut the diaphragm.

[0218] Since the cam cutter 81 can perform cutting actions periodically, the rotation period of the cam cutter 81 can be confirmed according to the length and linear velocity of the diaphragm during use, so that the cam cutter 81 can cut the diaphragm without deceleration.

[0219] The periodic intermittent cutting of the cam cutter 81 can be achieved through various structures. For example, the cam cutter 81 can include a driving device, a cam, a rocker arm, and a cutter. The driving device drives the cam to rotate, which drives the rocker arm to reciprocate, thereby enabling the cutter to intermittently cut the diaphragm. For another example, the cam cutter 81 can also be through a driving device, a crank-slider mechanism, and a cutter. The driving device drives the driving slider mechanism to move, and then drives the cutter to reciprocate through the crank-slider mechanism. It can be understood that the periodic intermittent cutting action of the cam cutter 81 can also be achieved through other structures, not limited to the above two.

[0220] As Figure 2 shown, in some embodiments, the cam cutter 81 cuts the first diaphragm 220 and the second diaphragm 240. In other embodiments, the diaphragm to be cut can also be only the first diaphragm 220 or the second diaphragm 240, or the diaphragm to be cut includes both a diaphragm and a pole piece at the same time.

[0221] The diaphragm cutting mechanism 80 provided in this embodiment includes a cam cutter 81 and a tool holder 82. The cam cutter 81 can perform cutting actions periodically and intermittently. By controlling the intermittent duration of the cam cutter 81, the length of the diaphragm can be controlled. The intermittent indexing action accuracy of the cam cutter 81 is relatively high, and moreover, the cam cutter 81 can cut the diaphragm without deceleration, further improving the winding efficiency.

[0222] In order to cut the diaphragm without decelerating the diaphragm, the rotation period duration 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.

[0223] In some embodiments, the rotation period duration 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 period duration 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.

[0224] The rotation period duration of the cam cutter 81 is the time taken for the cam cutter 81 to rotate one week; the diaphragm to be cut can be the first diaphragm 220 and / or the second diaphragm 240. By cutting the first diaphragm 220 and / or the second diaphragm 240, first diaphragms 220 and / or second diaphragms 240 with a preset length can be formed in the electrode assembly 200; the transmission line speed of the diaphragm to be cut refers to the transmission line speed of the diaphragm to be cut before entering the winding mechanism 30.

[0225] For Figure 2For example, the first diaphragm 220 and the second diaphragm 240 are simultaneously conveyed toward the winding mechanism 30 and have the same transmission line speed. The lengths of the first diaphragm 220 and the second diaphragm 240 in the electrode assembly 200 may be equal or unequal. For example, if the length of the first diaphragm 220 in the electrode assembly 200 is greater than the length of the second diaphragm 240, the rotation period 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.

[0226] By satisfying the above conditions, the cam cutter 81 can continuously rotate. Since the cam cutter 81 does not need to stop rotating, the waiting time for cutting is saved; the cam cutter 81 can cut the diaphragm to be cut every time it rotates one week, and there is no need to reduce the transmission line speed of the diaphragm in order to cut the diaphragm, realizing the cutting of the diaphragm without deceleration and effectively improving the overall winding speed.

[0227] In other embodiments, if the cam cutter 81 needs to move toward the tool holder 82 after rotating, the rotation period of the cam cutter 81 may also be less than the ratio of the length of the diaphragm to be cut to the transmission line speed of the diaphragm to be cut.

[0228] 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 disposed on one side of the winding mechanism 30. The diaphragm unwinding mechanism 20 is used to convey the second diaphragm 240 to the winding needle 32 located at the winding station 301, and the composite sheet body 250 and the second diaphragm 240 converge on the winding needle 32 at the winding station 301.

[0229] In the third embodiment, the diaphragm unwinding mechanism 20 directly conveys the second diaphragm 240 to the winding mechanism 30, so that the composite sheet body 250 conveyed by the composite mechanism 10 and the second diaphragm 240 conveyed by the diaphragm unwinding mechanism 20 are wound together.

[0230] By adopting the above technical solution, the diaphragm unwinding mechanism 20 can directly convey 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 body 250 and the second diaphragm 240 together to form the electrode assembly 200.

[0231] As Figure 3 shown, the diaphragm cutting mechanism 80 is located between the winding station 301 and the finishing station 302 along the rotation direction of the turntable 31, and the diaphragm cutting mechanism 80 can cut the first diaphragm 220 and the second diaphragm 240 simultaneously.

[0232] Please refer to Figure 4, the fourth embodiment of the present application provides a winding device 100, which includes 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 jointly winding the second diaphragm 240 and the composite sheet 250 to form a laminated sheet. Compared with the third embodiment, the diaphragm cutting mechanism 80 in the winding device 100 is different.

[0233] In the fourth embodiment, the diaphragm cutting mechanism 80 is arranged on the feeding side of the winding mechanism 30. There are two diaphragm cutting mechanisms 80. One diaphragm cutting mechanism 80 is arranged between the composite mechanism 10 and the winding mechanism 30 and is used for cutting the first diaphragm 220. The other diaphragm cutting mechanism 80 is arranged between the diaphragm unwinding mechanism 20 and the winding mechanism 30 and is used for cutting the second diaphragm 240. The winding device 100 further includes two conveying members 90, and each conveying member 90 is respectively arranged between the corresponding diaphragm cutting mechanism 80 and the winding mechanism 30. One conveying member 90 is used for conveying the composite sheet 250, and the other conveying member 90 is used for conveying the second diaphragm 240. The diaphragm cutting mechanism 80 may include a cam cutter 81, or may include a cutter that reciprocates linearly, a laser cutter, etc.

[0234] By adopting the above technical solution, both the first diaphragm 220 and the second diaphragm 240 are 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 that rotates with the turntable 31.

[0235] Please refer to Figure 1 , the winding device 100 provided by 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 further includes a first pole piece cutting device 51, a second pole piece cutting device 52, and a buffer mechanism 60. The first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are arranged on the feeding side of the composite component 14. The winding mechanism 30 is arranged on the discharging side of the composite component 14. The buffer 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 arranged between the winding station 301 and the discharging station 304.

[0236] The working principle of the winding device 100 is as follows:

[0237] The first pole piece 210, the second pole piece 230, and the first separator 220 are unwound. The first pole piece 210 and the second pole piece 230 wrap the first separator 220 in the middle and are laminated together through the lamination assembly 14 to form a laminated sheet 250. The first detection device 41 detects whether there are defects in the laminated sheet 250. During subsequent transmission and winding, the first pole piece 210, the second pole piece 230, and the first separator 220 will not move relative to each other. Then, after the laminated sheet 250 passes through the buffer mechanism 60, it converges with the second separator 240 to form a stacked sheet. The second detection device 42 detects whether there are defects in the stacked sheet, which can be used to guide the deviation correction of the separator.

[0238] After the first winding needle 32 winds the electrode assembly 200, the remaining first separator 220 and the second separator 240 at the end are not wound. At this time, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the tail winding roller 33. The separator cutting mechanism 80 cuts the separator at the end, and the tail winding roller 33 presses the separator for winding at the end. After winding, it continues to rotate along the circumferential direction of the turntable 31 to the adhesive pasting roller 34. The adhesive pasting roller 34 pastes the end adhesive on the electrode assembly 200 to ensure that the separator does not come apart. Then, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the blanking station 304. The blanking structure clamps the electrode assembly 200 for blanking. Then, the winding needle 32 continues to rotate 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 uppermost winding station 301, and the winding needle 32 extends, and the pole piece is fed and wound, and so on in a cycle.

[0239] Please refer to Figure 2 As shown in, the winding device 100 provided in the second embodiment of the present application includes a lamination mechanism 10, a separator unwinding mechanism 20, and a winding mechanism 30. The lamination mechanism 10 includes a first unwinding roller 11, a second unwinding roller 12, a third unwinding roller 13, and a lamination assembly 14. The winding device 100 further includes a first pole piece cutting device 51, a second pole piece cutting device 52, and a buffer mechanism 60. The first unwinding roller 11, the second unwinding roller 12, and the third unwinding roller 13 are provided on one side of the winding device 100. The winding mechanism 30 is provided on the other side of the winding device 100. The buffer mechanism 60 is provided downstream of the lamination assembly 14. The separator unwinding mechanism 20 is provided downstream of the lamination mechanism 10. The winding mechanism 30 includes a turntable 31 and a plurality of winding needles 32. The separator cutting mechanism 80 is located upstream of the winding mechanism 30. The separator cutting mechanism 80 includes a cam cutter 81 and a tool holder 82. The winding device 100 further includes a vacuum adsorption transmission belt provided between the separator cutting mechanism 80 and the winding mechanism 30.

[0240] The working principle of the winding device 100 is as follows:

[0241] The first pole piece 210, the second pole piece 230, and the first separator 220 are unwound. The first pole piece 210 and the second pole piece 230 wrap the first separator 220 in the middle and are laminated together through the lamination assembly 14 to form a laminated sheet 250. The laminated sheet 250 is detected by the first detection device 41, and the first pole piece 210, the second pole piece 230, and the first separator 220 will not move relative to each other during subsequent transmission and winding. Then, after the laminated sheet 250 passes through the buffer mechanism 60, it converges with the second separator 240 to form a stacked sheet. The second detection device 42 detects the stacked sheet, which can be used to guide the deviation correction of the separator.

[0242] Next, the cam cutter 81 cuts the first separator 220 and the second separator 240 without reducing the conveying speed of the diaphragm. The tail diaphragm of the previous electrode assembly 200 is conveyed to the winding needle 32 through the vacuum adsorption conveyor belt, and the head diaphragm of the next electrode assembly 200 is conveyed to the winding needle 32 through the vacuum adsorption belt. Then, after the first winding needle 32 winds, the remaining tail diaphragm has not been wound. At this time, the winding needle 32 rotates along the circumferential direction of the turntable 31 to the tail winding roller 33. The tail winding roller 33 presses the diaphragm to wind up the tail. After winding, it continues to rotate along the circumferential direction of the turntable 31 to the glue sticking roller 34. The glue sticking roller 34 sticks the finishing glue to the electrode assembly 200 to ensure that the diaphragm does not come apart. Then, the winding needle 32 rotates to the blanking station 304, and the blanking assembly 70 clamps the electrode assembly 200 to unload. Then, the winding needle 32 rotates to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 rotates to the uppermost winding station 301, and the winding needle 32 extends to wind the pole piece. This process repeats in a cycle.

[0243] Please refer to Figure 3 , the third embodiment of the present application provides a winding device 100. Different from the first embodiment, the separator unwinding mechanism 20 is arranged on one side of the winding mechanism 30, and the winding needle 32 at the winding station 301 is used for the second separator 240 and the laminated sheet 250 to converge.

[0244] The working principle of the winding device 100 is as follows:

[0245] The first pole piece 210, the second pole piece 230, and the first separator 220 are unrolled. The first pole piece 210 and the second pole piece 230 wrap the first separator 220 in the middle and are laminated together through the lamination assembly 14 to form a laminated sheet body 250. The laminated sheet body 250 is detected by the first detection device 41. Then, the laminated sheet body 250 and the second separator 240 are respectively fed into the winding needle 32. After the first winding needle 32 winds, the remaining end separator is not fed into the winding. At this time, the winding needle 32 rotates to the end roller 33, and the separator cutting mechanism 80 cuts the end separator. The end roller 33 presses the separator to wind up the end. Then the winding needle 32 rotates to the glue-applying roller 34, and the glue-applying roller 34 applies the end glue to the electrode assembly 200 to ensure that the separator does not come apart. Then the winding needle 32 rotates to the blanking station 304, and the blanking assembly 70 clamps the electrode assembly 200 for blanking. Then the winding needle 32 rotates to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 rotates to the uppermost winding station 301, the winding needle 32 extends, and the pole piece is fed for winding. This process repeats in a cycle.

[0246] Please refer to Figure 4 , a winding device 100 is provided in the fourth embodiment of the present application. Different from the third embodiment, there are two separator cutting mechanisms 80. One separator cutting mechanism 80 is provided between the lamination mechanism 10 and the winding mechanism 30 and is used to cut the first separator 220, and the other separator cutting mechanism 80 is provided between the separator unwinding mechanism 20 and the winding mechanism 30 and is used to cut the second separator 240. The winding device 100 further includes two conveying members 90, and each conveying member 90 is provided between the separator cutting mechanism 80 and the winding mechanism 30. The separator cutting mechanism 80 may include a cam cutter 81, or may include a cutter that reciprocates linearly, a laser cutter, etc.

[0247] The working principle of the winding device 100 is as follows:

[0248] The first electrode sheet 210, the second electrode sheet 230, and the first separator 220 are unrolled. The first electrode sheet 210 and the second electrode sheet 230 wrap the first separator 220 in the middle and are laminated together through the lamination assembly 14 to form a laminated sheet body 250. The laminated sheet body 250 is detected by the first detection device 41. Then, the laminated sheet body 250 and the second separator 240 are respectively fed into the winding needle 32, and the first separator 220 and the second separator 240 are respectively cut by the separator cutting mechanism 80 before entering the winding needle 32. The tail separator of the previous electrode assembly 200 is transported to the winding needle 32 through the vacuum adsorption transmission belt, and the head separator of the next electrode assembly 200 is transported to the winding needle 32 through the vacuum adsorption transmission belt. Then, after the first winding needle 32 winds, the remaining tail separator is not fed into the winding needle. At this time, the winding needle 32 rotates to the tail winding roller 33, and the tail winding roller 33 presses the separator to wind up the tail. Then, the winding needle 32 rotates to the adhesive pasting roller 34, and the adhesive pasting roller 34 pastes the tail adhesive on the electrode assembly 200. Then, the winding needle 32 rotates to the blanking station 304, and the blanking assembly 70 clamps the electrode assembly 200 to unload. Then, the winding needle 32 continues to rotate to the retraction station 305, and the winding needle 32 retracts. Finally, the winding needle 32 rotates to the uppermost winding station 301, the winding needle 32 extends, and the electrode sheet is fed for winding. This process is repeated in a cycle.

[0249] An embodiment of the second aspect 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, has a high winding efficiency, and thus has a high manufacturing efficiency.

[0250] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A winding device, characterized in that, 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 together 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 to wind the composite sheet and the second separator to form an electrode assembly.

2. The winding device according to claim 1, characterized in that, 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 to detect the composite sheet.

3. The winding device according to claim 1, characterized in that, 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 together to form the composite sheet.

4. The winding device according to claim 3, characterized in that, 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, characterized in that, 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 to buffer the composite sheet.

6. The winding device according to claim 5, characterized in that, 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 to cut 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 to cut the second pole piece.

7. The winding device according to claim 5, characterized in that, 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 movement 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, characterized in that 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, characterized in that, A glue pasting station is further arranged on the winding device, the glue pasting 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 glue pasting station, and the blanking station.

10. The winding device according to claim 9, characterized in that, The winding mechanism further includes a glue pasting roller arranged at the glue pasting station, and the glue pasting roller is used to paste glue on 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 glue pasting station along the rotation direction of the turntable, and the winding needle can rotate with the turntable into one of the winding station, the glue pasting station, the finishing station, and the blanking station.

12. The winding device according to claim 11, characterized in that, 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, characterized in that, There are at least four winding needles, which are circumferentially spaced along the turntable.

14. The winding device according to claim 12, characterized in that, 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 gluing 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 according to claim 14, characterized in that, 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, characterized in that, The winding needles include two main body parts rotatably disposed on the turntable. A receiving gap is formed between the two main body parts for the composite sheet body and the second diaphragm to pass through. The two main body parts cooperate to wind the composite sheet body and the second diaphragm.

17. The winding device according to any one of claims 8-15, characterized in that 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, characterized in that, 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 body to form a laminated sheet body and convey the laminated sheet body to the winding mechanism.

19. The winding device according to claim 18, characterized in that, 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 body.

20. The winding device according to claim 18, characterized in that, 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 body.

21. The winding device according to any one of claims 8-15, characterized in that, The diaphragm unwinding mechanism is disposed on one side of the winding mechanism and is used to convey the second diaphragm to the winding needles at the winding station. The composite sheet body 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, characterized in that, 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, characterized in that, 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, characterized in that, The diaphragm cutting mechanism is located on the feed side of the winding mechanism.

25. The winding device according to claim 24, characterized in that, The winding device further includes a conveying member disposed between the diaphragm cutting mechanism and the winding mechanism. The conveying member 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 conveying member is a vacuum adsorption transmission belt.

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

28. The winding device according to any one of claims 22-27, characterized in that, 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, characterized in that, It includes the winding device according to any one of claims 1-29.

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