Winding device

Abstract

The utility model is applicable to the technical field of power batteries, and provides winding equipment, which comprises a first unwinding assembly, a second unwinding assembly and a winding assembly, the second unwinding assembly is used for winding the diaphragm; the composite assembly is used for enabling the pole piece to be attached to the diaphragm; the winding assembly is arranged on the downstream of the compounding assembly and comprises a base and at least two winding needles, the winding needles are rotationally connected to the base, and the base is used for driving the different winding needles to sequentially and alternately move to one side of the compounding assembly; in the winding equipment provided by the invention, the base drives the winding needles to sequentially and alternately move on one side of the composite assembly, so that ending treatment of the winding needles after winding the electrode assembly can be carried out at other positions, feeding of the pole pieces and the diaphragms does not need to wait for ending treatment, the feeding waiting time of the pole pieces and the diaphragms is shortened, and the working efficiency is improved. And the production efficiency is improved.

Description

[0001] Cross Reference to Related Applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202420072183.7, filed on January 11, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of power batteries, and particularly relates to a winding device. BACKGROUND

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

[0005] In the battery production process, the winding of the electrode assembly is a very important process, and the electrode assembly needs to be wound by a winding device. In the current winding device, the winding of the pole piece and the separator is concentrated at the winding needle, and the pole piece and the separator need to be slowed down or stopped after winding by the winding needle to wait for the finishing processing of the winding needle after winding the electrode assembly, which has low production efficiency. CONTENT OF THE UTILITY MODEL

[0006] In view of the above problems, the present application provides a winding device which can at least alleviate the problem of low production efficiency caused by the need for pole piece to slow down or stop waiting for the winding core to finish.

[0007] The present application provides a winding device, comprising:

[0008] A first unwinding assembly for winding the pole piece;

[0009] A second unwinding assembly for winding the separator;

[0010] A composite assembly for attaching the pole piece and the separator;

[0011] A winding assembly is arranged downstream of the composite assembly, and the winding assembly comprises a base and at least two winding needles, the winding needles are rotationally connected to the base, and the base is used to drive different winding needles to move to one side of the composite assembly in turn.

[0012] The base is arranged to drive the winding needles to alternately move on one side of the composite assembly and one side of the tail structure, so that when one winding needle is located on one side of the composite assembly, another winding needle can be located on one side of the tail structure.

[0013] In some embodiments, the winding assembly comprises a tail structure arranged on one side of the base.

[0014] The base is arranged to drive different winding needles to alternately move on one side of the composite assembly and one side of the tail structure, so that when one winding needle is located on one side of the composite assembly, another winding needle can be located on one side of the tail structure.

[0015] In the technical scheme of the embodiment, when one winding needle completes winding and moves to one side of the tail structure, another winding needle can move to one side of the composite assembly to continue winding, so that different winding needles can continuously wind the electrode assembly, thereby further reducing the waiting time of the supply of the pole piece and the diaphragm and improving the production efficiency.

[0016] In some embodiments, the tail structure comprises a tail roller arranged on one side of the base, and the tail roller is arranged to press and combine the pole piece and the diaphragm.

[0017] The technical scheme of the embodiment provides specific structures of the tail structure, and the tail structure comprises a tail roller, so that the pole piece and the diaphragm are pressed and held by the tail roller, and the pole piece and the diaphragm are combined by the pressure of the tail roller, thereby reducing the separation of the pole piece and the diaphragm.

[0018] In some embodiments, the tail structure further comprises a rubberizing roller arranged on one side of the base, and the rubberizing roller is arranged to fix the diaphragm to the pole piece.

[0019] The technical scheme of the embodiment further provides specific structures of the tail structure, and the tail roller further comprises a rubberizing roller, so that after the pole piece and the diaphragm are combined by the tail roller, rubber is attached to the tail end of the electrode assembly by the rubberizing roller, thereby further fixing the pole piece and the diaphragm and obtaining an electrode assembly that is connected stably and not easy to separate, and reducing the separation of the pole piece and the diaphragm.

[0020] In some embodiments, the winding assembly comprises at least three winding needles, and different winding needles can be located on one side of the composite assembly, one side of the tail roller, and one side of the rubberizing roller, respectively.

[0021] The technical scheme of the embodiment makes the winding needle have at least three, and makes the pressing action and the rubberizing action be performed at different positions respectively, so that different winding needles can make the corresponding electrode assemblies be in the winding, pressing or rubberizing action respectively, the pressing action and the rubberizing action in the finishing process can be completed at different positions respectively, the staying time of the winding needle in each staying position is further shortened, the winding speed of the winding needle when winding the electrode assembly can be faster, and the production efficiency is further improved.

[0022] In some embodiments, the winding device further comprises a discharging assembly;

[0023] The winding assembly comprises at least four winding needles, and different winding needles can be respectively at one side of the composite assembly, the finishing roller, the rubberizing roller and the discharging assembly.

[0024] The technical scheme of the embodiment makes the winding device further comprise a discharging assembly, the electrode assembly on the winding needle is taken down by the discharging assembly, and the winding needle is empty, so that the empty winding needle winds the electrode assembly at one side of the composite assembly; meanwhile, the winding needle has at least four, and the pressing action, the rubberizing action and the discharging action are performed at different positions respectively, the staying time of the winding needle in each staying position is further shortened, the winding speed of the winding needle when winding the electrode assembly can be faster, and the production efficiency is further improved.

[0025] In some embodiments, the composite assembly, the finishing roller, the rubberizing roller and the discharging assembly are arranged along a circular track in sequence, and the base can drive the winding needle to move along the circular track.

[0026] The technical scheme of the embodiment makes the composite assembly, the finishing roller, the rubberizing roller and the discharging assembly be distributed along a circle, and the base drives the winding needle to rotate along a circular track, so that the winding needle can pass through each structure in sequence and finally obtain an electrode assembly with relatively stable connection; meanwhile, after the discharging assembly takes down the electrode assembly, the winding needle can also return to one side of the composite assembly to wind the electrode assembly, achieving the effect of cyclic work, and facilitating the setting of the distance between each structure and the staying time of the winding needle in each position, so as to further improve the production efficiency.

[0027] In some embodiments, the base is further provided with an avoiding part, the avoiding part is arranged beside the winding needle, the winding needle can enter the avoiding part, and the winding needle can move out of the avoiding part.

[0028] The empty winding needle after the finishing process may interfere with the electrode assembly when moving to one side of the composite assembly and affect the normal winding of the electrode assembly; accordingly, the technical scheme of the embodiment provides the avoiding part on the base, so that the empty winding needle can avoid the electrode assembly when moving to one side of the composite assembly, to reduce the situation that the electrode assembly is prematurely wound on the winding needle and causes winding abnormity.

[0029] In some embodiments, the winding needle comprises a main body part and a fixing groove arranged on the main body part, the main body part is capable of rotating relative to the base to wind the pole piece and the diaphragm, and the fixing groove is used for accommodating part of the pole piece and part of the diaphragm.

[0030] The technical scheme of the embodiment provides specific structures of some winding needles, so that the electrode assembly can enter the fixing groove and be fixed to realize fixation of the head end of the electrode assembly, and then the rotation of the winding needle can wind the electrode assembly on the winding needle and enable the tail end of the electrode assembly to be located outside the winding needle, so as to facilitate subsequent tail processing of the tail end of the electrode assembly.

[0031] In some embodiments, the winding device further comprises a pole piece cutting assembly and a diaphragm cutting assembly, the pole piece cutting assembly is arranged between the first unwinding assembly and the composite assembly, and the diaphragm cutting assembly is arranged upstream of the winding assembly.

[0032] In the technical scheme of the embodiment, the winding device further comprises a pole piece cutting assembly and a diaphragm cutting assembly to cut the pole piece and the diaphragm respectively, the pole piece cutting assembly is arranged between the first unwinding assembly and the composite assembly, and the diaphragm cutting assembly is arranged between the composite assembly and the winding assembly, so that the pole piece cutting assembly can cut the pole piece before the pole piece and the diaphragm are combined, and the diaphragm cutting assembly can cut the diaphragm after the pole piece and the diaphragm are combined, which can more easily make the length of the diaphragm greater than the length of the pole piece, thereby meeting the use requirement of the electrode assembly.

[0033] In some embodiments, the diaphragm cutting assembly comprises a first cam cutter and a first abutting piece arranged at intervals, the first cam cutter is capable of moving and cutting the diaphragm on the first abutting piece.

[0034] The technical scheme of the embodiment provides specific structures of some diaphragm cutting assemblies, the first cam cutter and the first abutting piece are used to cut the diaphragm, the first cam cutter can periodically and intermittently perform a cutting action, the length of the diaphragm can be controlled by controlling the intermittent duration of the first cam cutter, the intermittent indexing action of the cam cutter has high accuracy and does not need other structures to control the position of the cam cutter at the intermittent time, which facilitates control and also simplifies the structure of the cutter.

[0035] In some embodiments, the winding device further comprises a detection assembly arranged between the composite assembly and the winding assembly.

[0036] Since the current winding of the pole piece and the diaphragm is usually carried out at the winding needle, the head end of the pole piece and the diaphragm entering the winding needle cannot be easily detected by the detection equipment. Accordingly, in the technical scheme of the embodiment, the winding device comprises a detection assembly, and the detection assembly is arranged between the composite assembly and the winding assembly. The positions of the pole piece and the diaphragm in the electrode assembly after being combined by the composite assembly are relatively fixed and not easy to deviate. The structure of the electrode assembly after being detected by the detection assembly is not easy to change, and the detection result is more accurate. At the same time, the detection assembly arranged upstream of the winding assembly can comprehensively detect the electrode assembly, reduce the area of the dead angle or the undetectable position, and improve the accuracy of the detection assembly.

[0037] In some embodiments, the first unwinding assembly comprises a first pole piece roller for winding the first pole piece;

[0038] The second unwinding assembly comprises a first diaphragm roller for winding the first diaphragm;

[0039] The composite assembly comprises a first composite roller group for combining the first pole piece and the first diaphragm.

[0040] In the technical scheme of the embodiment, the first composite roller group can first combine the first pole piece and the first diaphragm, so as to facilitate subsequent combination with the second pole piece and the second diaphragm, thereby reducing the possibility of poor combination effect caused by the combination of the two pole pieces and the two diaphragms at one composite structure.

[0041] In some embodiments, the first unwinding assembly further comprises a second pole piece roller for winding the second pole piece;

[0042] The second unwinding assembly further comprises a second diaphragm roller for winding the second diaphragm;

[0043] The composite assembly further comprises a second composite roller group for combining the first diaphragm, the second pole piece and the second diaphragm.

[0044] In the technical scheme of the embodiment, the second composite roller group can combine the first diaphragm, the second pole piece and the second diaphragm to obtain the electrode assembly. Compared with the scheme of combining the pole piece and the diaphragm at the winding needle, this setting can reduce the functional requirements of the winding needle, thereby facilitating the improvement of the winding speed of the winding needle and the production efficiency. At the same time, the combination of the pole piece and the diaphragm can be completed before winding, so as to reduce the displacement of the pole piece and the diaphragm during the winding process, and the detection assembly can also comprehensively detect.

[0045] In some embodiments, the winding device further comprises a buffer assembly arranged between the first composite roller group and the second composite roller group, and the buffer assembly is used for winding the first pole piece and the first diaphragm.

[0046] In the technical solution of the embodiment, the buffer assembly is arranged between the first composite roller group and the second composite roller group. The buffer assembly can buffer part of the first pole piece and the diaphragm after the first pole piece is compounded with the first diaphragm. The buffer assembly can buffer part of the first pole piece and the diaphragm when the winding needle switches or other tension decreases, and release the buffered first pole piece and diaphragm when the tension is normal, so as to reduce the negative impact of the winding needle switching, pole piece cutting, or other conditions on the feeding of the second diaphragm roller and the first pole piece roller, reduce the occurrence of the deceleration or shutdown of the second diaphragm roller and the first pole piece roller, so that the second diaphragm roller and the first pole piece roller can continuously feed, and the production efficiency is improved.

[0047] In some embodiments, the buffer assembly includes a fixed roller and a floating roller. The position of the fixed roller is fixed relative to the first composite roller group, and the floating roller can move close to or away from the fixed roller to change the length of the first pole piece and the first diaphragm wound in the buffer assembly.

[0048] The technical solution of the embodiment provides specific structures of some buffer assemblies, and the floating roller is used to achieve the buffering and releasing effects of the first pole piece and the first diaphragm. For example, when the first pole piece and the first diaphragm need to be buffered, the floating roller can move away from the fixed roller to increase the length of the first pole piece and the first diaphragm in the buffer assembly. When the first pole piece and the first diaphragm need to be released, the floating roller can move close to the fixed roller to reduce the length of the first pole piece and the first diaphragm in the buffer assembly.

[0049] In some embodiments, the winding device further includes a cutter and a second abutting piece arranged between the first pole piece roller and the first composite roller group. The cutter and the second abutting piece are arranged opposite to each other and are spaced apart to allow the first pole piece to pass through. The cutter is used to cut the first pole piece on the second abutting piece.

[0050] The technical solution of the embodiment provides specific structures of some pole piece cutting assemblies. The cutter and the second abutting piece are arranged between the first pole piece roller and the first composite roller group. The second abutting piece supports the first pole piece and provides support for the cutter to cut the first pole piece. The cutter cuts the pole piece to achieve the cutting of the first pole piece.

[0051] In some embodiments, the winding device further includes a second cam cutter and a third abutting piece arranged between the second pole piece roller and the second composite roller group. The second cam cutter and the third abutting piece are arranged opposite to each other and are spaced apart to allow the second pole piece to pass through. The second cam cutter can rotate and cut the first pole piece on the third abutting piece.

[0052] The technical scheme of the embodiment provides specific structures of the pole piece cutting assembly, the second cam cutter and the third abutting piece are arranged between the second pole piece roller and the second composite roller group, the third abutting piece supports the second pole piece and provides support for the second cam cutter to cut the second pole piece, and the pole piece is cut through the second cam cutter, so that the cutting of the first pole piece is realized, the intermittent indexing action of the cam cutter structure is high in accuracy, and the position of the intermittent action does not need to be controlled by other structures, so that the structure of the cutter is facilitated to control and is also simplified.

[0053] In some embodiments, conveying structures are arranged between the first pole piece roller and the first composite roller group and between the second pole piece roller and the second composite roller group, and the conveying structures are used to convey the first pole piece or the second pole piece.

[0054] In the technical scheme of the embodiment, the second pole piece and the first pole piece are conveyed through the conveying structures, so that the stability of conveying is increased, and the occurrence of situations such as lack of conveying power after the pole piece is cut is reduced.

[0055] In some embodiments, the winding device further comprises a first detection device arranged between the second composite roller group and the winding assembly.

[0056] In the technical scheme of the embodiment, the first detection device is arranged between the second composite roller group and the winding assembly, so that the electrode assembly after being compounded is detected through the first detection device, the positions of the pole piece and the separator in the electrode assembly after being compounded by the second composite roller group are relatively fixed and are not easy to deviate, the structure of the electrode assembly after being detected by the first detection device is not easy to change, the detection result is relatively accurate, meanwhile, the first detection device arranged upstream of the winding assembly can comprehensively detect the electrode assembly, the area of dead angles or undetectable positions is reduced, and the accuracy of the first detection device is improved.

[0057] In some embodiments, the winding device further comprises a second detection device arranged between the first composite roller group and the second composite roller group.

[0058] In the technical scheme of the embodiment, the second detection device is arranged between the first composite roller group and the second composite roller group, so that the first pole piece and the first separator after being compounded are detected through the second detection assembly, if the structure of the first pole piece, the first separator or both after being compounded is abnormal, the second detection device can timely find the abnormality, so that the negative influence on subsequent processes is reduced.

[0059] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0060] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the scope of the present application. The same reference numbers in different drawings identify the same components throughout the text. In the drawings:

[0061] Figure 1 Structure schematic diagram of winding equipment provided for some embodiments of the present application.

[0062] The meanings of the marks in the drawings are as follows:

[0063] 100, winding equipment;

[0064] 10, first unwinding assembly; 11, first pole piece roller; 12, second pole piece roller;

[0065] 20, second unwinding assembly; 21, first diaphragm roller; 22, second diaphragm roller;

[0066] 30, composite assembly; 31, first composite roller group; 32, second composite roller group;

[0067] 40, winding assembly; 401, circular track; 41, base; 411, position avoiding part; 42, winding needle; 421, fixed groove; 422, main body part; 43, tail structure; 431, tail roller; 432, rubber sticking roller;

[0068] 50, blanking assembly; 51, clamping jaw; 52, platform;

[0069] 61, pole piece cutting assembly; 611, cutter; 612, second abutting part; 613, second cam cutter; 614, third abutting part; 62, diaphragm cutting assembly; 621, first cam cutter; 622, first abutting part;

[0070] 70, detection assembly; 71, first detection device; 72, second detection device;

[0071] 80, buffer assembly; 81, fixed roller; 82, floating roller;

[0072] 90, conveying structure. DETAILED DESCRIPTION

[0073] The embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0075] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise limited by explicit examples.

[0076] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0078] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0079] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0080] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0081] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0082] In the battery production process, the winding of the electrode assembly is a very important process, and the electrode assembly usually includes a cathode sheet, an upper separator, an anode sheet and a lower separator, which are wound by a winding device. In the winding process, after the winding of the electrode assembly is completed, it usually needs to be processed; for example, the tail end of the electrode assembly is pressed to reduce the separation and misalignment of the electrode sheet and the separator; for example, the electrode assembly is glued at the tail end to further fix the electrode sheet and the separator and reduce the separation of the electrode sheet and the separator.

[0083] The electrode assembly is the main component of the battery where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding the anode sheet, the separator and the cathode sheet, so the winding of the electrode assembly is a very important process in the battery production process.

[0084] In the current winding device, the winding of the electrode sheet and the separator is concentrated at the winding needle, and the winding needle is used for winding the electrode sheet and the separator, and also needs to play a compounding role, which leads to that the rotation speed of the winding needle cannot be too fast to reduce the poor compounding effect caused by too fast rotation speed; at the same time, after the winding needle completes the winding of the electrode assembly, it also needs to be processed, at this time the winding needle cannot continue to wind the electrode sheet and the separator, and the feeding speed of the electrode sheet and the separator needs to be reduced or stopped to wait for the end of the tail end processing of the electrode assembly and the discharging of the electrode assembly before the next winding can continue, the production efficiency is low.

[0085] In order to alleviate the problem that the feeding device of the pole piece and the diaphragm needs to slow down or stop during the winding process of the winding needle electrode assembly, the function of the winding needle can be reduced. Specifically, one or more buffer structures can be arranged between the unwinding structure for feeding the pole piece and the diaphragm and the winding needle. When the winding needle is winding and finishing the electrode assembly, the unwinding structure can not stop and temporarily store the provided pole piece and diaphragm in the adjacent buffer structure, so as to realize the non-stop of the pole piece and diaphragm during the winding process. However, this setting can only achieve the effect of non-stop feeding, and the discharge efficiency is still affected by the rotation speed of the winding needle and the finishing speed, and the improvement of the discharge efficiency is small.

[0086] Based on the above considerations, in order to improve the efficiency of the winding device, the winding device provided by the embodiment of the present application is provided with a composite assembly, and the pole piece and the diaphragm are compounded through the composite assembly; at least two winding needles are arranged, and the winding needles are driven to move by the base, so that different winding needles can alternately move on one side of the composite assembly and one side of the finishing structure, that is, when one winding needle is on one side of the finishing structure, another winding needle can be on one side of the composite assembly. After the winding of one winding needle is finished and the winding needle is idle, the winding of another winding needle is finished and the winding needle can move to one side of the finishing structure, and the idle winding needle moves to one side of the composite assembly, so as to realize the alternate movement of the winding needle on one side of the composite assembly.

[0087] In such a winding device, the function required by the winding needle is reduced, so that the winding needle does not need to have the compounding ability, thereby increasing the rotation speed of the winding needle and improving the winding efficiency of the electrode assembly; the winding needle moves to other positions different from one side of the composite assembly for finishing processing, so as to reduce the negative influence of the finishing processing on the winding of another winding needle; the winding needle can alternately move to one side of the composite assembly, and the waiting time of the feeding and unwinding assembly of the pole piece and the diaphragm is only the time of the alternate movement of the winding needle, thereby reducing the waiting time of the feeding of the pole piece and the diaphragm and improving the production efficiency.

[0088] The winding device provided by the embodiment of the present application can wind to form a cylindrical electrode assembly, or can wind to form a prismatic electrode assembly or an electrode assembly of other shapes. The electrode assembly formed by the winding device can be used as a component for electrochemical reaction in a battery monomer. The battery monomer can be used in a power consumption device using a battery as a power source or various energy storage systems using a battery as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0089] The following embodiments are described by taking a winding device 100 for forming a cylindrical electrode assembly as an example for convenience of description.

[0090] Some embodiments of the present application provide a winding device 100, which is described with reference to Figure 1 , Figure 1 A structural schematic diagram of the winding device 100 provided by some embodiments of the present application is shown in the figure.

[0091] The winding device 100 comprises a first unwinding assembly 10, a second unwinding assembly 20, a composite assembly 30, and a winding assembly 40, wherein the first unwinding assembly 10 is used for winding an electrode sheet; the second unwinding assembly 20 is used for winding a separator; the composite assembly 30 is used for attaching the electrode sheet and the separator; the winding assembly 40 is arranged downstream of the composite assembly 30, and the winding assembly 40 comprises a base 41 and at least two winding needles 42 rotatably connected to the base 41, the base 41 is used to drive different winding needles 42 to move to one side of the composite assembly 30 in turn.

[0092] The first unwinding assembly 10 refers to a structure for winding an electrode sheet in the winding device 100, the first unwinding structure is used to provide an electrode sheet, and the first unwinding assembly 10 can move the electrode sheet to subsequent structures such as the composite assembly 30; according to the function of the winding device 100, the first unwinding assembly 10 can comprise structures for winding cathode sheets and anode sheets respectively, or structures for winding only cathode sheets or anode sheets; the first unwinding assembly 10 can comprise a roller body, or a reel, a shaft or other structures; the first unwinding assembly 10 can comprise a passive structure, that is, other structures (such as the composite assembly 30) in the winding device 100 can pull the electrode sheet to make the first unwinding assembly 10 unwind and feed; the first unwinding assembly 10 can also comprise an active structure, for example, a motor or other structures are used to control the unwinding and feeding of the first unwinding assembly 10.

[0093] The second unwinding assembly 20 refers to a structure for winding a separator in the winding device 100, the second unwinding structure is used to provide a separator, and the second unwinding assembly 20 can move the separator to subsequent structures such as the composite assembly 30; according to the function and structure of the winding device 100, the second unwinding assembly 20 can comprise two or more separator winding structures, or only one separator winding structure; the second unwinding assembly 20 can comprise a roller body, or a reel, a shaft or other structures; the second unwinding assembly 20 can comprise a passive structure, that is, other structures (such as the composite assembly 30) in the winding device 100 can pull the separator to make the second unwinding assembly 20 unwind and feed; the second unwinding assembly 20 can also comprise an active structure, for example, a motor or other structures are used to control the unwinding and feeding of the second unwinding assembly 20.

[0094] The composite assembly 30 refers to a structure in the winding device 100 for bonding the pole piece to the separator. The composite assembly 30 can press the pole piece to the separator, or bond the pole piece to the separator by adhesion or other means. Depending on the bonding method, the composite assembly 30 can include oppositely arranged compression rollers, or can include a glue supply structure, a glue coating structure, or other composite structures. The composite assembly 30 can include only one composite structure, or can include two or more composite structures. The composite structure in the composite assembly 30 can be used to composite the anode pole piece, the separator, the cathode pole piece, and another separator, or can be used to composite only the cathode pole piece and the separator, or the anode pole piece and the separator. The composite assembly 30 can also be used to composite two separators on the two sides of the cathode pole piece or the anode pole piece. The composite assembly 30 can also be used for other composite methods. After the pole piece and the separator are bonded by the composite assembly 30, a composite structure can be formed and transported to the winding needle 42, so that the winding needle 42 can be wound into the required shape.

[0095] The winding assembly 40 refers to a structure in the winding device 100 for winding the pole piece and the separator. After the composite structure formed by the pole piece and the separator is wound, an electrode assembly can be formed. The winding assembly 40 can include a winding needle 42 for winding the pole piece and the separator. The winding assembly 40 can also include a holding member, a gluing member, a discharging member, and the like for end processing.

[0096] The base 41 refers to a structure in the winding assembly 40 for providing a fixed basis for the winding needle 42 or other structures. The shape of the base 41 can be circular, square, or other shapes. The material of the base 41 can include metal, plastic, or other materials.

[0097] The winding needle 42 refers to a structure in the winding assembly 40 for winding the composite structure. Depending on the shape of the electrode assembly required, the winding needle 42 can be cylindrical to form a cylindrical electrode assembly, or can be prismatic to form a square electrode assembly. It can be understood that the winding needle 42 can also be of other shapes.

[0098] The end structure 43 refers to a structure in the winding assembly 40 for end processing of the wound composite structure. The end structure 43 can include a holding member such as a compression roller or a compression plate for holding the composite structure. The end structure 43 can also include a gluing member such as a glue coating brush or a glue coating roller for fixing the pole piece and the separator. The end structure 43 can also include a discharging structure such as a robot for removing the composite structure from the winding needle 42.

[0099] The winding needle 42 is arranged on the base 41 and can rotate relative to the base 41 to wind the composite structure. The winding needle 42 is provided with at least two, for example, two, three, or more.

[0100] The base 41 can drive the winding needle 42 to move and drive different winding needles 42 to move alternately on one side of the composite assembly 30, so that when one winding needle 42 is located on one side of the composite assembly 30, the other winding needle 42 can be located at other positions to facilitate the finishing process. This arrangement allows the finishing process of the composite structure to be carried out at other positions different from the composite assembly 30, without occupying the space on one side of the composite assembly 30, thereby leaving space on the other side of the composite assembly 30 for another idle winding needle 42 to move to one side of the composite assembly 30 and wind the composite structure.

[0101] It can be understood that, under the premise that the winding assembly 40 is downstream of the composite assembly 30, the base 41 can drive the winding needle 42 to be on either side of the composite assembly 30. For example, referring to Figure 1 In the figure, from left to right is the direction from upstream to downstream, the winding needle 42 can be located below the right side of the composite assembly 30, or above, below or at other positions of the right side of the composite assembly 30.

[0102] For example, when two winding needles 42 are provided on the base 41, when one winding needle 42 is located on one side of the composite assembly 30, the winding needle 42 can wind the composite structure, and at this time, the other winding needle 42 is located at other positions to facilitate the finishing structure 43 to finish the composite structure on the winding needle 42; when the winding of the winding needle 42 on one side of the composite assembly 30 is completed, the composite structure on the winding needle 42 at other positions is also finished and discharged, that is, at this time, the winding needle 42 at other positions is idle; then moving the base 41 can move the idle winding needle 42 to one side of the composite assembly 30 and wind the composite structure, and the winding needle 42 that has finished winding moves to other positions to facilitate finishing; that is, most of the time on one side of the composite assembly 30 has a winding needle 42, and only when the winding needles 42 are alternately moved, there is no winding needle 42, and the first unwinding assembly 10 and the second unwinding assembly 20 only need to wait for a short time for the winding needles 42 to be alternately moved.

[0103] Because there is a distance between the composite assembly 30 and the winding needle 42, by controlling the distance, the first unwinding assembly 10 and the second unwinding assembly 20 can continuously unwind without deceleration; that is, after one winding needle 42 finishes winding, the first unwinding assembly 10 and the second unwinding assembly 20 unwind and make the composite structure move in the distance between the composite assembly 30 and the winding needle 42, before the composite structure moves to the position of the winding needle 42, the idle winding needle 42 can move to one side of the composite assembly 30 and receive the composite structure.

[0104] In the embodiment, the base 41 is arranged and the winding needle 42 is arranged on the base 41, so that the base 41 can drive the winding needle 42 to move alternately on one side of the composite assembly 30, so that the winding needle 42 can perform the tail processing after winding the composite structure in other positions, so that the supply of the pole piece and the diaphragm does not need to wait for the end of the tail processing, and the waiting time of the supply of the pole piece and the diaphragm is reduced; the composite assembly 30 is arranged before the winding assembly 40, and the pole piece and the diaphragm are attached by the composite assembly 30, so that the pole piece and the diaphragm do not need to be attached at the winding needle 42, the functional requirements of the winding needle 42 are reduced, the winding needle 42 can wind faster, and the production efficiency is further improved.

[0105] In some embodiments, the winding device 100 further comprises a housing for providing a fixed base for the first unwinding assembly 10, the second unwinding assembly 20, the composite assembly 30 and the winding assembly 40; the housing can be a cuboid box structure with an internal cavity for accommodating the first unwinding assembly 10, the second unwinding assembly 20, the composite assembly 30 and the winding assembly 40, the housing can be a frame structure and enclose an accommodation space for accommodating the first unwinding assembly 10, the second unwinding assembly 20, the composite assembly 30 and the winding assembly 40, or the housing can be other structures; the material of the housing can include metal, plastic or other materials.

[0106] According to some embodiments of the present application, referring to Figure 1 , Figure 1 The structure schematic diagram of the winding device 100 provided by some embodiments of the present application is shown.

[0107] In some embodiments of the present application, the winding assembly 40 further comprises a tail processing structure 43 arranged on one side of the base 41; the base 41 is used to drive different winding needles 42 to move alternately on one side of the composite assembly 30 and one side of the tail processing structure 43, so that one winding needle 42 is located on one side of the composite assembly 30 and another winding needle 42 is located on one side of the tail processing structure 43.

[0108] The tail processing structure 43 refers to a structure in the winding assembly 40 for performing tail processing on the wound composite structure, and the composite structure forms an electrode assembly after being processed by the tail processing structure 43; the tail processing structure 43 can comprise a pressing member for pressing the composite structure, such as a pressing roller, a pressing plate and the like, the tail processing structure 43 can further comprise a gluing member for fixing the pole piece and the diaphragm, such as a gluing brush, a gluing roller and the like, and the tail processing structure 43 can further comprise a discharging structure for taking the electrode assembly from the winding needle 42, such as a mechanical hand and the like.

[0109] The base 41 can drive the winding needle 42 to move and drive different winding needles 42 to move alternately beside the composite assembly 30 and beside the finishing structure 43, so that when one winding needle 42 is beside the composite assembly 30, another winding needle 42 can be beside the finishing structure 43. This arrangement allows the finishing process of the composite structure to be carried out in a position other than the composite assembly 30, without occupying the space around the composite assembly 30, thereby leaving space around the composite assembly 30 for another idle winding needle 42 to move beside the composite assembly 30 and wind the composite structure.

[0110] It can be understood that, under the premise that the base 41 can drive the winding needle 42 to move beside the finishing structure 43 for finishing processing, the finishing structure 43 can be on either side of the base 41. For example, referring to Figure 1 In the drawings, the direction from left to right is from upstream to downstream, the finishing structure 43 can be on the left side of the base 41 and below the right side of the composite assembly 30.

[0111] For example, when two winding needles 42 are provided on the base 41, when one winding needle 42 is beside the composite assembly 30, it can wind the composite structure, and at this time, the other winding needle 42 is beside the finishing structure 43, so that the finishing structure 43 finishes the composite structure on the winding needle 42; when the winding of the winding needle 42 beside the composite assembly 30 is completed, the composite structure on the winding needle 42 beside the finishing structure 43 is also finished and discharged, that is, at this time, the winding needle 42 beside the finishing structure 43 is idle; then moving the base 41 can move the idle winding needle 42 to the side of the composite assembly 30 and wind the composite structure, and the winding needle 42 that has finished winding moves to the side of the finishing structure 43 to be finished; that is, most of the time beside the composite assembly 30 has a winding needle 42, and only when the winding needles 42 are alternately moved, there is no winding needle 42, and the first and second unwinding assemblies 10 and 20 only need to wait for a short time for the winding needles 42 to be alternately moved.

[0112] In this embodiment, when one winding needle 42 finishes winding and moves to one side of the finishing structure 43, the other winding needle 42 can move to one side of the composite assembly 30 to continue winding, so that different winding needles 42 can continuously wind the composite structure, thereby further reducing the waiting time for the supply of the pole piece and the diaphragm and improving the production efficiency.

[0113] Referring to Figure 1 In some embodiments, the finishing structure 43 includes a finishing roller 431 provided on one side of the base 41, which is used to press the pole piece and the diaphragm.

[0114] The tailing roller 431 refers to a structure in the tailing structure 43 that exerts pressure on the composite structure wound on the winding needle 42. After the composite structure is wound on the winding needle 42, the tail end of the pole piece and the tail end of the diaphragm are prone to separation and lifting. Therefore, the main function of the tailing roller 431 is to press the tail end of the composite structure to reduce the separation of the pole piece and the diaphragm at the tail end of the composite structure and increase the stability of the adhesion of the pole piece and the diaphragm in the composite structure.

[0115] The pressure of the tailing roller 431 on the composite structure can be achieved by adjusting the distance between the tailing roller 431 and the winding needle 42. For example, when the winding needle 42 moves to the side of the tailing roller 431, the distance between the tailing roller 431 and the winding needle 42 can be equal to the thickness of the composite structure on the winding needle 42. At this time, the tailing roller 431 can press the lifted tail end of the composite structure back and wind it on the winding needle 42. For another example, when the winding needle 42 moves to the side of the tailing roller 431, the distance between the tailing roller 431 and the winding needle 42 can be less than the thickness of the composite structure on the winding needle 42. At this time, the tailing roller 431 can not only press the tail end of the composite structure back, but also further exert pressure on the tail end of the composite structure to increase the bonding force between the pole piece and the diaphragm at the tail end of the composite structure.

[0116] It can be understood that, on the premise that the base 41 can drive the winding needle 42 to move to the side of the tailing roller 431 for tailing processing, the tailing roller 431 can be on either side of the base 41. For example, referring to FIG. 1, the tailing roller 431 can be on the left side of the base 41 and below the right side of the composite assembly 30. Figure 1 In the drawing, the direction from left to right is from upstream to downstream. When the base 41 rotates in the counterclockwise direction, the tailing roller 431 can be on the left side of the base 41 and below the right side of the composite assembly 30.

[0117] The tailing roller 431 can rotate to make the friction between the tailing roller 431 and the composite structure rolling friction, thereby reducing the friction between the tailing roller 431 and the composite structure. The tailing roller 431 can be a rotatable dynamic roller. For example, after the winding needle 42 moves to the side of the tailing roller 431, the composite structure contacts the tailing roller 431. The rotation of the winding needle 42 drives the tailing roller 431 to rotate through the friction between the composite structure and the tailing roller 431. This arrangement can make the tailing roller 431 rotate synchronously with the winding needle 42 to reduce the sliding friction between the tailing roller 431 and the composite structure caused by the different rotation speeds of the tailing roller 431 and the winding needle 42. The tailing roller 431 can also be a driven roller driven by a motor, a rotary cylinder or other structures. At this time, the winding needle 42 can rotate or not rotate when it is on the side of the tailing roller 431. It can be understood that the tailing roller 431 can also be a fixed structure, which can also provide pressure to the composite structure.

[0118] The tailing roller 431 can be floating relative to the winding needle 42. For example, when the winding needle 42 moves to one side of the tailing roller 431, the tailing roller 431 can also be floating in the radial direction of the winding needle 42 to adjust the distance between the tailing roller 431 and the winding needle 42. The floating of the tailing roller 431 can be achieved by a spring, and the pressure of the tailing roller 431 on the composite structure can be adjusted by selecting different specifications of the spring. The floating of the tailing roller 431 can also be achieved by a gas cylinder, a hydraulic cylinder or the like. In this case, the pressure of the tailing roller 431 on the composite structure can be directly adjusted by the gas cylinder or the hydraulic cylinder. It can be understood that the floating tailing roller 431 can rotate simultaneously or not.

[0119] The embodiment provides specific structures of some tailing structures 43. The tailing structure 43 comprises the tailing roller 431, so that the tailing roller 431 can press and hold the pole piece and the diaphragm on the winding needle 42, and the pressure of the tailing roller 431 can press the pole piece and the diaphragm to reduce the separation of the pole piece and the diaphragm.

[0120] Reference Figure 1 In some embodiments, the tailing structure 43 further comprises a rubberizing roller 432 arranged on one side of the base 41. The rubberizing roller 432 is used to fix the diaphragm on the pole piece.

[0121] The rubberizing roller 432 refers to a structure in the tailing structure 43 for rubberizing the pole piece. The rubberizing roller 432 can be used to paste a fixed structure such as adhesive tape or adhesive paper on the tail end of the composite structure to fix the tail end of the composite structure, so as to further reduce the situation that the tail end of the composite structure is warped, and further reduce the situation that the pole piece and the diaphragm are separated at the tail end of the composite structure.

[0122] It can be understood that, under the premise that the rubberizing roller 432 is downstream of the tailing roller 431, the rubberizing roller 432 can be arranged on any side of the base 41. For example, referring to Figure 1 In the figure, the direction from left to right is the direction from upstream to downstream. When the base 41 rotates in the counterclockwise direction, the rubberizing roller 432 can be arranged on the left side of the base 41 and below the tailing roller 431.

[0123] The glue roller 432 can adhere the glue paper on the composite structure in various ways. In some embodiments, the glue roller 432 can be wound with several base tapes on which the glue papers are sequentially adhered. When the winding needle 42 moves to the side of the glue roller 432, the composite structure can be in contact with the glue paper, and then the rotation of the winding needle 42 can make the glue paper adhered to the composite structure separate from the base tape. Meanwhile, the glue roller 432 can also play a role similar to the tailing roller 431, that is, it can hold the glue paper on the composite structure. When the gluing of one composite structure is completed, the glue roller 432 can be rotated to expose the next glue paper to wait for the next winding needle 42. In other embodiments, when the winding needle 42 moves to the side of the glue roller 432 and the composite structure is in contact with the glue paper, the winding needle 42 can no longer rotate. At this time, the rotation of the glue roller 432 can also adhere the glue paper to the composite structure. It can be understood that the glue roller 432 can also adhere or apply glue to the tail end of the composite structure by other ways, not limited to the above two ways.

[0124] The present embodiment further provides specific structures of the tailing structure 43, so that the tailing structure 43 further includes a glue roller 432. After the tailing roller 431 presses the pole piece and the diaphragm, the glue roller 432 adheres glue to the tail end of the composite structure to further fix the pole piece and the diaphragm and obtain a composite structure that is more stable and less likely to separate.

[0125] Reference Figure 1 In some embodiments, the winding assembly 40 includes at least three winding needles 42, and different winding needles 42 can be respectively located at one side of the composite assembly 30, one side of the tailing roller 431, and one side of the glue roller 432.

[0126] Since the tailing structure 43 includes the tailing roller 431 and the glue roller 432, at this time the winding needle 42 has at least three positions to stay, that is, one side of the composite assembly 30, one side of the tailing roller 431, and one side of the glue roller 432. Accordingly, the winding assembly 40 includes at least three winding needles 42. When one winding needle 42 is located at one side of the composite assembly 30 and winds the composite structure, there is a winding needle 42 at one side of the tailing roller 431 and one side of the glue roller 432.

[0127] In such a structure, the composite structure at one side of the tailing roller 431 is only subjected to pressing treatment, and the composite structure at one side of the glue roller 432 is only subjected to gluing treatment. Compared with the longer staying time required for the winding needle 42 to stay at the same position to receive the tailing and gluing treatments, this setting places the tailing and gluing at different positions, shortens the time required for the winding needle 42 to stay each time, thereby shortening the staying time of the winding needle 42 at one side of the composite assembly 30 and improving the winding speed of the winding needle 42, and further improving the speeds of the first unwinding assembly 10, the second unwinding assembly 20, and the composite assembly 30, that is, achieving the effect of improving the production efficiency of the entire winding equipment 100.

[0128] In the embodiment, the winding needles 42 are at least three, and the pressing action and the taping action are performed at different positions respectively, so that different winding needles 42 can make the corresponding composite structure respectively in the winding, pressing or taping action, further shortening the residence time of the winding needle 42 in each residence position, so that the winding needle 42 can have a faster winding speed when winding the composite structure, thereby further improving the production efficiency.

[0129] Reference Figure 1 In some embodiments, the winding device 100 further comprises a discharging assembly 50; the winding assembly 40 comprises at least four winding needles 42, and different winding needles 42 can be respectively at one side of the composite assembly 30, the finishing roller 431, the taping roller 432 and the discharging assembly 50.

[0130] The discharging assembly 50 refers to a structure in the winding device 100 for taking the electrode assembly from the winding needle 42, and the discharging assembly 50 is used to take the electrode assembly on the winding needle 42, so that the winding needle 42 is in an idle state, thereby facilitating the movement of the idle winding needle 42 to the side of the composite assembly 30.

[0131] The discharging assembly 50 can include a gripper, a mechanical hand or other structures; in some embodiments, the discharging assembly 50 includes a gripper 51 and a platform 52, the gripper 51 is used to take the wound electrode assembly from the winding needle 42, and the platform 52 is used to carry the electrode assembly taken down by the gripper 51, so as to facilitate the subsequent process to obtain the wound electrode assembly from the platform 52.

[0132] Because the winding device 100 further comprises the discharging assembly 50, the winding needle 42 has at least four positions to be stopped, i.e., one side of the composite assembly 30, one side of the finishing roller 431, one side of the taping roller 432 and one side of the discharging assembly 50; accordingly, the winding assembly 40 comprises at least four winding needles 42, when one winding needle 42 is at one side of the composite assembly 30 and winds the composite structure, there is a winding needle 42 at one side of the finishing roller 431, one side of the taping roller 432 and one side of the discharging assembly 50.

[0133] In such a structure, the composite structure on one side of the finishing roller 431 is only subjected to the pressing process, the composite structure on one side of the rubberizing roller 432 is only subjected to the rubberizing process, and the material discharging assembly 50 is only used for taking out the material. Compared with the longer staying time required for the winding needle 42 to stay at the same position to receive the finishing process, the rubberizing process and the material discharging, the arrangement of the finishing, the rubberizing and the material discharging at different positions further shortens the time required for the winding needle 42 to stay at each position, thereby further shortening the staying time of the winding needle 42 on one side of the composite assembly 30 and improving the winding speed of the winding needle 42, and further improving the speed of the first unwinding assembly 10, the second unwinding assembly 20 and the composite assembly 30, that is, the production efficiency of the entire winding device 100 is further improved.

[0134] The embodiment makes the winding device 100 further include the material discharging assembly 50, the electrode assembly on the winding needle 42 is taken out by the material discharging assembly 50 and the winding needle 42 is left empty, so that the empty winding needle 42 winds the composite structure on one side of the composite assembly 30; at the same time, the winding needle 42 has at least four, and the pressing action, the rubberizing action and the material discharging action are performed at different positions, which further shortens the staying time of the winding needle 42 at each position, so that the winding needle 42 can have a faster winding speed when winding the composite structure, thereby further improving the production efficiency.

[0135] Reference Figure 1 In some embodiments, the composite assembly 30, the finishing roller 431, the rubberizing roller 432 and the material discharging assembly 50 are arranged along the circular track 401 in sequence, and the base 41 can drive the winding needle 42 to move along the circular track 401.

[0136] The circular track 401 refers to an arrangement track arranged in the winding device 100, and the arrangement track is circular. The composite assembly 30, the finishing roller 431, the rubberizing roller 432 and the material discharging assembly 50 are arranged along the circular track 401 in sequence, so that the winding needle 42 can move along the circular track 401 and perform the winding, the finishing, the rubberizing and the material discharging actions in sequence, and can return to one side of the composite assembly 30 to be wound again after the electrode assembly on the winding needle 42 is taken out.

[0137] Since the composite assembly 30, the finishing roller 431, the rubberizing roller 432 and the material discharging assembly 50 are arranged along the circular track 401 in sequence, the base 41 can rotate and drive the winding needle 42 to move along the circular track 401, so that the winding needle 42 can move to one side of the composite assembly 30, one side of the finishing roller 431, one side of the rubberizing roller 432 and one side of the material discharging assembly 50 in sequence to form a cycle, and the rotation of the base 41 can also make the winding needle 42 return to one side of the composite assembly 30 from one side of the material discharging assembly 50 and perform the next cycle.

[0138] The composite assembly 30, the finishing roller 431, the rubber coating roller 432 and the discharging assembly 50 can be arranged in sequence along the circular track 401 in a clockwise direction, and the rotating direction of the base 41 is also clockwise; the composite assembly 30, the finishing roller 431, the rubber coating roller 432 and the discharging assembly 50 can be arranged in sequence along the circular track 401 in an anticlockwise direction, and the rotating direction of the base 41 is also anticlockwise.

[0139] It can be understood that the finishing roller 431, the rubber coating roller 432 and the discharging assembly 50 can be located on the inner side of the circular track 401, or on the outer side of the circular track 401; for example, the finishing roller 431, the rubber coating roller 432 and the discharging assembly 50 are all located on the outer side of the circular track 401, so as to reduce the interference with the rotation of the base 41.

[0140] In the embodiment, the composite assembly 30, the finishing roller 431, the rubber coating roller 432 and the discharging assembly 50 are distributed along a circle, and the base 41 drives the winding needle 42 to rotate along the circular track 401, so that the winding needle 42 can pass through each structure in sequence and finally obtain an electrode assembly with relatively stable connection; at the same time, after the discharging assembly 50 takes down the electrode assembly, the winding needle 42 can also return to the side of the composite assembly 30 to wind the composite structure, so as to achieve the effect of cyclic work, and it is also convenient to set the distance between each structure and the residence time of the winding needle 42 in each position, so as to further improve the production efficiency.

[0141] Reference Figure 1 In some embodiments, the base 41 is further provided with an avoiding part 411, the avoiding part 411 is located on the side of the winding needle 42, the winding needle 42 can enter the avoiding part 411, and the winding needle 42 can move out of the avoiding part 411.

[0142] The avoiding part 411 refers to a structure formed on the base 41 for accommodating the winding needle 42; the avoiding part 411 can be a hole opened on the base 41, or a groove or other structure; since the avoiding part 411 is used for accommodating the winding needle 42, the avoiding part 411 should be located on the side of the winding needle 42; the avoiding part 411 can be a square groove, a semicircular groove, a square hole, a circular hole or other structures.

[0143] The structure and position of the retaining part 411 can be configured in various ways. In some embodiments, the retaining part 411 is a hole coaxially arranged with the winding needle 42. During the movement of the unloaded winding needle 42 to one side of the composite component 30, the winding needle 42 can move axially along the retaining part 411 and retract into the retaining part 411. When the winding needle 42 moves to a designated position on one side of the composite component 30, the winding needle 42 can extend out of the retaining part 411 to reset, thereby facilitating the winding of the composite structure. In other embodiments... In this embodiment, the clearance portion 411 is a groove provided on one side of the winding needle 42. During the process of the empty winding needle 42 moving to one side of the composite component 30, the winding needle 42 can swing relative to the base 41 and enter the clearance portion 411. When the winding needle 42 moves to the designated position on one side of the composite component 30, the winding needle 42 can swing out of the clearance portion 411 to reset, thereby facilitating the winding of the composite structure. It is understood that the structure and position of the clearance portion 411 can also be configured in other ways, and are not limited to the two mentioned above.

[0144] Because the empty winding needle 42 after finishing may interfere with the composite structure when it moves to the side of the composite component 30, thus affecting the normal winding of the composite structure; accordingly, in this embodiment, a clearance part 411 is provided on the base 41 so that the empty winding needle 42 can avoid the composite structure when it moves to the side of the composite component 30, thereby reducing the occurrence of abnormal winding caused by the composite structure being pre-wound onto the winding needle 42.

[0145] According to some embodiments of this application, reference is made to Figure 1 , Figure 1 This is a schematic diagram of the structure of a winding device 100 provided in some embodiments of this application.

[0146] In some embodiments of this application, the winding needle 42 includes a main body 422 and a fixing groove 421 provided on the main body 422. The main body 422 can rotate relative to the base 41 to wind the electrode and the diaphragm. The fixing groove 421 is used to accommodate part of the electrode and part of the diaphragm.

[0147] The main body 422 refers to the structure of the coiling needle 42 used to wind the composite structure, which can be wound onto the main body 422; the main body 422 can rotate relative to the base 41 to drive the composite structure to be wound onto the main body 422; depending on the required shape of the composite structure, the shape of the main body 422 can be cylindrical, prismatic, or other shapes; the material of the main body 422 can include plastic, metal, or other materials.

[0148] The fixing groove 421 refers to the groove-shaped structure formed on the main body 422. The head end of the composite structure can enter into the fixing groove 421 and be accommodated in the fixing groove 421. The fixing groove 421 can penetrate the main body 422 radially, or it can extend into the main body 422 and have a groove bottom.

[0149] To facilitate the winding of the composite structure on the main body 422, the head end of the composite structure should not be easily detached from the fixing groove 421, that is, the fixing groove 421 also has the function of limiting the displacement of the head end of the composite structure inside it. The limiting function of the fixing groove 421 can be achieved by various structures. In some embodiments, the inner wall surface of the fixing groove 421 can be provided as a rough surface to increase the friction between the composite structure and the inner wall of the fixing groove 421, so that the composite structure is not easily detached from the fixing groove 421; in another embodiment, the fixing groove 421 penetrates the main body 422, and the composite structure can pass through the fixing groove 421 and extend to the other end of the fixing groove 421. When the main body 422 rotates, the composite structure wound on the main body 422 will press the head end of the composite structure extending out of the fixing groove 421 against the main body 422 to limit the displacement of the head end of the composite structure, so that the composite structure is not easily detached from the fixing groove 421; in still other embodiments, the fixing groove 421 penetrates the main body 422 and divides the main body 422 into two sub-needles. The two sub-needles can approach or move away from each other. When the head end of the composite structure enters the fixing groove 421, the two sub-needles can approach each other and clamp the composite structure, so that the composite structure is not easily detached from the fixing groove 421. It can be understood that the fixing groove 421 can also limit the displacement of the composite structure by other structures, not limited to the above several structures.

[0150] The present embodiment provides some specific structures of the winding needle 42, so that the composite structure can enter the fixing groove 421 and be fixed to achieve the fixation of the head end of the composite structure. After that, the rotation of the winding needle 42 can wind the composite structure on the winding needle 42, and the tail end of the composite structure can be located outside the winding needle 42, so as to facilitate the subsequent tail processing of the tail end of the composite structure.

[0151] According to some embodiments of the present application, reference is made to Figure 1 , Figure 1 The structure schematic diagram of the winding device 100 provided by some embodiments of the present application is shown.

[0152] In some embodiments of the present application, the winding device 100 further comprises a pole piece cutting assembly 61 and a separator cutting assembly 62. The pole piece cutting assembly 61 is arranged between the first unwinding assembly 10 and the composite assembly 30, and the separator cutting assembly 62 is arranged upstream of the winding assembly 40.

[0153] The pole piece cutting assembly 61 refers to a structure for cutting the pole piece in the winding device 100, and the pole piece cutting assembly 61 can include various cutting structures, such as a linear cutter reciprocating along a straight line, a cam cutter rotating around a shaft, etc.; the pole piece cutting assembly 61 can include only a cutting structure for cutting the cathode piece, or only a cutting structure for cutting the anode piece, or both a cutting structure for cutting the cathode piece and a cutting structure for cutting the anode piece.

[0154] The pole piece cutting assembly 61 is arranged between the first unwinding assembly 10 and the composite assembly 30, i.e., the pole piece cutting assembly 61 is upstream of the composite assembly 30, so that the pole piece cutting assembly 61 can cut the pole piece before the pole piece is combined with the separator, and the length of the separator in the electrode assembly usually needs to be greater than the length of the pole piece, so it is difficult to make the length of the pole piece less than the length of the separator after the pole piece is combined with the separator. Therefore, the pole piece cutting assembly 61 is arranged upstream of the composite assembly 30 to facilitate control of the length of the cut pole piece.

[0155] The separator cutting assembly 62 refers to a structure for cutting the separator in the winding device 100, and the separator cutting assembly 62 can include various cutting structures, such as a linear cutter reciprocating along a straight line, a cam cutter rotating around a shaft, etc.; according to the structure of the electrode assembly, the electrode assembly usually includes an upper separator and a lower separator, and at this time the separator cutting assembly 62 can include only a cutting structure for cutting the upper separator, or only a cutting structure for cutting the lower separator, or both a cutting structure for cutting the upper separator and a cutting structure for cutting the lower separator.

[0156] The separator cutting assembly 62 is upstream of the winding assembly 40, so that the separator cutting assembly 62 can cut the separator before the composite structure is wound on the winding needle 42, and the separator cutting assembly 62 can be arranged between the composite assembly 30 and the winding assembly 40, or between the second unwinding assembly 20 and the composite assembly 30; in some embodiments, the separator cutting assembly 62 is arranged between the composite assembly 30 and the winding assembly 40, so that the separator cutting assembly can cut the separator after the separator is combined with the pole piece.

[0157] In this embodiment, the winding device 100 further includes a pole piece cutting assembly 61 and a separator cutting assembly 62 to cut the pole piece and the separator, respectively; the pole piece cutting assembly 61 is arranged between the first unwinding assembly 10 and the composite assembly 30, and the separator cutting assembly 62 is arranged between the composite assembly 30 and the winding assembly 40, so that the pole piece cutting assembly 61 can cut the pole piece before the pole piece and the separator are combined, and the separator cutting assembly 62 can cut the separator after the pole piece and the separator are combined. This arrangement can more easily make the length of the separator greater than the length of the pole piece, thereby meeting the use requirements of the electrode assembly.

[0158] Reference Figure 1In some embodiments, the diaphragm cutting assembly 62 comprises a first cam cutter 621 and a first abutting piece 622 arranged opposite to each other, the first cam cutter 621 is capable of rotating and cutting the diaphragm on the first abutting piece 622.

[0159] The first cam cutter 621 refers to a structure in the diaphragm cutting assembly 62 for cutting the diaphragm. The first cam cutter 621 is capable of intermittent action and cutting the diaphragm, and the length of the cut diaphragm can be adjusted by adjusting the time of the first cam cutter 621 cutting the diaphragm twice in succession. The cam cutter has the advantages of high efficiency, high precision, accurate intermittent indexing action, and stable rotation, and can accurately achieve periodic and interval cutting of the diaphragm.

[0160] The periodic and interval cutting of the first cam cutter 621 can be achieved by various structures. For example, the first cam cutter 621 can comprise a driving device, a cam, a rocker arm, and a cutter. The driving device drives the cam to rotate and drives the rocker arm to reciprocate, thereby making the cutter cut the diaphragm intermittently. At this time, the intermittent time of the cutter = the required length of the diaphragm / the linear speed of the cam. For another example, the first cam cutter 621 can also comprise a driving device, a slider-crank mechanism, and a cutter. The driving device drives the slider-crank mechanism to move, thereby driving the cutter to reciprocate through the slider-crank mechanism. At this time, the intermittent time of the cutter = the required length of the diaphragm / the linear speed output by the driving device. It can be understood that the periodic and interval cutting action of the first cam cutter 621 can also be achieved by other structures, not limited to the above two.

[0161] The first abutting piece 622 refers to a structure in the diaphragm cutting structure that supports the first cam cutter 621. The diaphragm can pass through the first abutting piece 622, and the first cam cutter 621 can cut the diaphragm while pressing the diaphragm on the first abutting piece 622. The material of the first abutting piece 622 can include plastic, metal, or other materials.

[0162] The first abutting piece 622 can be a long rectangular plate structure, a cylindrical structure, or other structures. The first abutting piece 622 can be a fixed structure or a rotatable structure to reduce the friction between the diaphragm and the first abutting piece 622. In some embodiments, the first abutting piece 622 is a roller structure rotatably connected to the housing. The first cam cutter 621 can cut the diaphragm while pressing the diaphragm on the roller mechanism and cutting the diaphragm.

[0163] The embodiment provides specific structures of some diaphragm cutting assemblies 62, and the diaphragm is cut through a first cam cutter 621 and a first abutting piece 622. The first cam cutter 621 can periodically and intermittently cut, and the length of the diaphragm can be controlled by controlling the intermittent time of the first cam cutter 621. The intermittent indexing action of the cam cutter has high accuracy, and the position of the cam cutter in the intermittent time does not need to be controlled, so that the structure of the cutter is facilitated to be controlled and simplified.

[0164] According to some embodiments of the present application, reference is made to Figure 1 , Figure 1 A structural schematic diagram of the winding equipment 100 provided by some embodiments of the present application is shown.

[0165] In some embodiments of the present application, the winding equipment 100 further comprises a detection assembly 70 arranged between the composite assembly 30 and the winding assembly 40.

[0166] The detection assembly 70 refers to a structure for detecting the pole piece, the diaphragm or the composite structure in the winding equipment 100. The detection assembly 70 can comprise a camera, a machine vision detection device or other structures. The detection assembly 70 can further comprise a control device and other devices. The detection assembly 70 can obtain image information (such as position, color, shape, etc.) of the relative pole piece, diaphragm or composite structure, and can convert the image information into a digital signal and send it to the control device, so that the control device can determine whether the pole piece, diaphragm or composite structure meets the requirements according to a preset program.

[0167] The detection assembly 70 is arranged between the composite assembly 30 and the winding assembly 40. The detection assembly 70 arranged at this position can detect the state of the composite structure after being compounded by the composite assembly 30. Arranging the detection assembly 70 between the composite assembly 30 and the winding assembly 40 can comprehensively detect the state of the entire composite structure passing through. Since the composite structure after being compounded will be wound by the winding needle 42, the head end of the composite structure will not be easily detected after entering the winding needle 42. Since the positions of the pole piece and the diaphragm in the composite structure after being compounded are relatively stable, displacement, misalignment and other situations are not prone to occur. Therefore, the state of the composite structure detected by the detection assembly 70 arranged between the composite assembly 30 and the winding assembly 40 is less different or the same as the state of the composite structure after being wound. The detection result of the detection assembly 70 can have high accuracy.

[0168] Since the current winding of the pole piece and the diaphragm is usually carried out at the winding needle 42, the head end of the pole piece and the diaphragm entering the winding needle 42 is not easy to be detected by the detection device; accordingly, in the embodiment, the winding device 100 comprises a detection assembly 70, and the detection assembly 70 is arranged between the composite assembly 30 and the winding assembly 40. The position of the pole piece and the diaphragm in the composite structure after being compounded by the composite assembly 30 is relatively fixed and not easy to shift, the structure of the composite structure after being detected by the detection assembly 70 is not easy to change, the detection result is more accurate, and at the same time, the arrangement of the detection assembly 70 upstream of the winding assembly 40 enables the detection assembly 70 to detect the composite structure more comprehensively, reduces the area of dead angle or undetectable position, and improves the accuracy of the detection assembly 70.

[0169] According to some embodiments of the present application, reference is made to Figure 1 , Figure 1 A structural schematic diagram of the winding device 100 provided by some embodiments of the present application is shown in FIG. 1.

[0170] In some embodiments of the present application, the first unwinding assembly 10 comprises a first pole piece roller 11 for winding the first pole piece; the second unwinding assembly 20 comprises a first diaphragm roller 21 for winding the first diaphragm; and the composite assembly 30 comprises a first composite roller group 31 for pasting the first pole piece and the first diaphragm.

[0171] The first pole piece roller 11 refers to a structure in the first unwinding assembly 10 for winding the first pole piece. The first pole piece 11 can be an anode piece or a cathode piece. The first pole piece roller 11 is rotatable so as to rotate and send the first pole piece wound thereon to the subsequent structure. The shape of the first pole piece roller 11 can be cylindrical, prismatic or other shapes. The material of the first pole piece roller 11 can include plastic, metal or other materials.

[0172] The first diaphragm roller 21 refers to a structure in the second unwinding assembly 20 for winding the first diaphragm. The first diaphragm roller 21 is rotatable so as to rotate and send the first diaphragm wound thereon to the subsequent structure. The shape of the first diaphragm roller 21 can be cylindrical, prismatic or other shapes. The material of the first diaphragm roller 21 can include plastic, metal or other materials.

[0173] The first composite roller set 31 refers to a structure in the composite assembly 30 for compositing the first pole piece and the first diaphragm. The first composite roller set 31 can include two oppositely spaced roller bodies, or one roller body and a table oppositely spaced from the roller body, or multiple roller bodies or other structures. Similar to the end roller 431, the roller body in the first composite roller set 31 can be a rotatable structure, a fixed structure, or a floating structure. Similar to the end roller 431, the roller body in the first composite roller set 31 can be a driving roller or a driven roller.

[0174] The first composite roller set 31 is used to make the first pole piece and the first diaphragm fit together, that is, the first pole piece on the first pole piece roller 11 and the first diaphragm on the first diaphragm roller 21 can be transported to the first composite roller set 31 and composited by the first composite roller set 31. The first composite roller set 31 can press the first pole piece onto the first diaphragm by pressure, or can make the first pole piece fit onto the first diaphragm by gluing or other methods.

[0175] In this embodiment, the first composite roller set 31 can first composite the first pole piece and the first diaphragm, so as to facilitate subsequent composition with the second pole piece and the second diaphragm, thereby reducing the possibility of poor composite effect caused by the composition of the two pole pieces and the two diaphragms at one composite structure.

[0176] Reference Figure 1 In some embodiments, the first unwinding assembly 10 further includes a second pole piece roller 12 for winding the second pole piece; the second unwinding assembly 20 further includes a second diaphragm roller 22 for winding the second diaphragm; and the composite assembly 30 further includes a second composite roller set 32 for making the first diaphragm, the second pole piece and the second diaphragm fit together.

[0177] The second pole piece roller 12 refers to a structure in the first unwinding assembly 10 for winding the second pole piece. The second pole piece can be an anode piece or a cathode piece, and the polarity of the second pole piece is different from that of the first pole piece. The second pole piece roller 12 is rotatable so as to rotate and send the second pole piece wound thereon to the subsequent structure. The shape of the second pole piece roller 12 can be cylindrical, prismatic or other shapes. The material of the second pole piece roller 12 can include plastic, metal or other materials.

[0178] The second diaphragm roller 22 refers to a structure in the second unwinding assembly 20 for winding the second diaphragm. The second diaphragm roller 22 is rotatable so as to rotate and send the second diaphragm wound thereon to the subsequent structure. The shape of the second diaphragm roller 22 can be cylindrical, prismatic or other shapes. The material of the second diaphragm roller 22 can include plastic, metal or other materials.

[0179] The second composite roller set 32 refers to a structure in the composite assembly 30 for compositing the first separator, the second pole piece and the second separator, wherein the first separator refers to the first separator after being composited with the first pole piece, that is, the second pole piece and the first pole piece are respectively arranged on two sides of the first separator, and the second separator is arranged on a side of the second pole piece away from the first separator, and the first separator, the second pole piece and the second separator can obtain a composite structure after being composited by the second composite roller set 32.

[0180] The second composite roller set 32 can include two oppositely spaced roller bodies, or one roller body and a support table oppositely spaced from the roller body, or a plurality of roller bodies or other structures; similar to the tailing roller 431, the roller body in the second composite roller set 32 can be a rotatable structure, or a fixed structure, or a floating structure; similar to the tailing roller 431, the roller body in the second composite roller set 32 can also be a driving roller or a driven roller.

[0181] The second composite roller set 32 is used to make the first separator, the second pole piece and the second separator fit together, that is, the second pole piece on the second pole piece roller 12 and the second separator on the second separator roller 22 can be transported to the second composite roller set 32 and composited by the second composite roller set 32; the second composite roller set 32 can press the first separator, the second pole piece and the second separator together by pressure, or can make the first separator, the second pole piece and the second separator fit together by gluing or other ways.

[0182] In the embodiment, the second composite roller set 32 can composite the first separator, the second pole piece and the second separator and obtain a composite structure, compared with the scheme of compositing the pole piece and the separator at the winding needle 42, the setting can reduce the functional requirements of the winding needle 42, thereby facilitating to improve the winding speed of the winding needle 42 and improve the production efficiency; at the same time, the composite of the pole piece and the separator can be completed before winding, so as to reduce the displacement of the pole piece and the separator in the winding process, and also make the detection assembly 70 can be more comprehensive detection.

[0183] Reference Figure 1 In some embodiments, the winding device 100 further includes a buffer assembly 80, the buffer assembly 80 is arranged between the first composite roller set 31 and the second composite roller set 32, and the buffer assembly 80 is used for winding the first pole piece and the first separator.

[0184] The cache component 80 refers to a structure in the winding device 100 for temporarily storing the pole piece and the diaphragm, and the cache structure can also release the cached pole piece and diaphragm; the cache component 80 is arranged between the first composite roller group 31 and the second composite roller group 32 for winding the first pole piece and the first diaphragm; for example, after the winding of the composite structure on the winding needle 42 is completed, the base 41 drives the movement of the winding needle 42 to move the idle winding needle 42 to one side of the second composite roller group 32; in this process, the first pole piece and the first diaphragm lack the tension provided by the winding needle 42, which can easily lead to insufficient tension and feeding amount, and at this time, the cache component 80 can cache part of the first pole piece and the first diaphragm to supplement the tension of the first pole piece and the first diaphragm, and reduce the occurrence of wrinkles in the first pole piece and the first diaphragm.

[0185] The cache component 80 can include one or more roller bodies, and the first pole piece and the first diaphragm can pass through one or more roller bodies of the cache component 80 to enter the second composite roller group 32; the cache component 80 can include one or more movable roller bodies for the first pole piece and the first diaphragm to pass through; in the process of driving the movement of the winding needle 42 by the base 41, the cache component 80 stores the first pole piece and the first diaphragm; for example, the roller body moves away from the first composite roller group 31 and the second composite roller group 32 to increase the length of the pole piece and the diaphragm between the first composite roller group 31 and the second composite roller group 32, thereby providing tension for the first pole piece and the diaphragm, and achieving the effect of caching part of the first pole piece and part of the diaphragm; after the winding needle 42 is on one side of the second composite roller group 32 and starts to wind the composite structure, the cache component 80 releases the first pole piece and the first diaphragm; for example, the roller body moves towards the first composite roller group 31 and the second composite roller group 32, so that the first pole piece and the first diaphragm stored in the cache component 80 can be pulled by the winding needle 42 and wound onto the winding needle 42 through the second composite roller group 32.

[0186] In this embodiment, the cache component 80 is arranged between the first composite roller group 31 and the second composite roller group 32, and the cache component 80 can cache part of the first pole piece and the diaphragm after the first pole piece and the diaphragm are combined, and can cache part of the first pole piece and the diaphragm when the tension is reduced due to the switching of the winding needle 42 or other reasons, and release the cached first pole piece and diaphragm when the tension is normal, thereby reducing the negative impact of the switching of the winding needle 42, the cutting of the pole piece, or other conditions on the feeding of the second diaphragm roller 22 and the first pole piece roller 11, reducing the occurrence of the deceleration or shutdown of the second diaphragm roller 22 and the first pole piece roller 11, and thereby enabling the second diaphragm roller 22 and the first pole piece roller 11 to continuously feed, and improving the production efficiency.

[0187] In some embodiments, the first electrode sheet is a cathode sheet, i.e., the first electrode sheet roller 11 is a cathode roller, and the buffer assembly 80 is used to buffer the cathode sheet and the first separator after being pressed by the first composite roller set 31. Due to material limitations, the cathode sheet and the first separator can be more stably combined after being compounded, so that the cathode sheet and the first separator are less likely to separate during the process of passing through the buffer assembly 80.

[0188] Reference Figure 1 In some embodiments, the buffer assembly 80 includes a fixed roller 81 and a floating roller 82. The fixed roller 81 is fixed relative to the first composite roller set 31, and the floating roller 82 can move closer to or farther away from the fixed roller 81 to change the length of the first electrode sheet and the first separator wound in the buffer assembly 80.

[0189] The fixed roller 81 refers to a roller body in the buffer assembly 80 that is fixed relative to the first composite roller set 31, i.e., the position of the fixed roller 81 is fixed relative to the machine shell. The fixed roller 81 can be a cylindrical roller body, a prismatic roller body, or a roller body of other shapes. The material of the fixed roller 81 can include plastic, metal, or other materials. The fixed roller 81 can be a rotatable structure or a fixed structure. The fixed roller 81 can be a passive roller that rotates with the movement of the electrode sheet and the separator, or an active roller that rotates by the driving of a motor or other driving device.

[0190] The floating roller 82 refers to a roller body in the buffer assembly 80 that can move relative to the fixed roller 81, i.e., the position of the floating roller 82 can change on the machine shell. The floating roller 82 can be a cylindrical roller body, a prismatic roller body, or a roller body of other shapes. The material of the floating roller 82 can include plastic, metal, or other materials. The floating roller 82 can be a rotatable structure or a fixed structure. The floating roller 82 can be a passive roller that rotates with the movement of the electrode sheet and the separator, or an active roller that rotates by the driving of a motor or other driving device.

[0191] The floating roller 82 can move in the direction of approaching the fixed roller 81 and in the direction of moving away from the fixed roller 81. When the floating roller 82 moves in the direction of moving away from the fixed roller 81, the buffer assembly 80 stores the first electrode sheet and the first separator. At this time, the length of the first electrode sheet and the first separator between the first composite roller set 31 and the second composite roller set 32 increases, and the movement of the floating roller 82 can also supplement the missing part of the pulling force on the first electrode sheet and the first separator. When the floating roller 82 moves in the direction of approaching the fixed roller 81, the buffer assembly 80 releases the first electrode sheet and the first separator.

[0192] The floating roller 82 can float passively or actively. In some embodiments, the floating roller 82 is floated by elastic elements such as springs and rubber strips, in which case the floating roller 82 floats passively. When the winding needle 42 winds the composite structure, the tension on the first electrode and the first diaphragm is large, causing the floating roller 82 to move closer to the fixed roller 81, and the elastic element is in a deformed state. However, during the movement of the winding needle 42 driven by the base 41, the tension on the first electrode and the first diaphragm decreases, the elastic element returns to its original shape, and the floating roller 82 moves away from the fixed roller 81. In other embodiments, the floating roller 82 is floated by active power devices such as cylinders and hydraulic cylinders, in which case the floating roller 82 floats actively. When the winding needle 42 winds the composite structure, the tension on the first electrode and the first diaphragm is large, and the power device drives the floating roller 82 to move closer to the fixed roller 81. During the movement of the winding needle 42 driven by the base 41, the tension on the first electrode and the first diaphragm decreases, and the power device drives the floating roller 82 to move away from the fixed roller 81.

[0193] The number of fixed rollers 81 can be one, two or more; the number of floating rollers 82 can be one, two or more; when the number of both fixed rollers 81 and floating rollers 82 is two or more, the fixed rollers 81 and floating rollers 82 can be alternately arranged in sequence.

[0194] This embodiment provides some specific structures of the buffer component 80, which achieves the buffering and releasing effects of the first electrode and the first diaphragm through the floating roller 82. For example, when the first electrode and the first diaphragm need to be buffered, the floating roller 82 can move away from the fixed roller 81 to increase the length of the first electrode and the first diaphragm in the buffer component 80. When the first electrode and the first diaphragm need to be released, the floating roller 82 can move closer to the fixed roller 81 to reduce the length of the first electrode and the first diaphragm in the buffer component 80.

[0195] According to some embodiments of this application, reference is made to Figure 1 , Figure 1 This is a schematic diagram of the structure of a winding device 100 provided in some embodiments of this application.

[0196] In some embodiments of this application, the winding device 100 further includes a cutter 611 and a second abutment 612 disposed between the first electrode roller 11 and the first composite roller group 31. The cutter 611 and the second abutment 612 are disposed opposite to each other and spaced apart to allow the first electrode to pass through. The cutter 611 is used to cut the first electrode on the second abutment 612.

[0197] The cutter 611 and the second abutment 612 are both part of the electrode cutting assembly 61. The cutter 611 and the second abutment 612 are located between the first electrode roller 11 and the first composite roller group 31 to cut the first electrode.

[0198] The cutter 611 refers to a structure for cutting the pole piece in the winding device 100; according to the shape of the cutter 611, the cutter 611 can be a groove cutter, a cutting knife or other types of cutters; according to the driving force of the cutter 611, the cutter 611 can realize the cutting action through the cooperation of the motor and the cam, the rocker arm, the cutter 611 can also be driven by the cylinder, the hydraulic cylinder and other devices to realize the reciprocating cutting action; in some embodiments, the first pole piece is a cathode piece, because the material of the cathode piece usually includes lithium iron phosphate, lithium cobaltate or silicon-based materials, vanadate materials and the like, the cut is easy to be rough or burr when cutting, so the cutter 611 is driven by the cylinder to reduce the roughness of the cut and reduce the burr.

[0199] The second abutting piece 612 refers to a structure that supports the cutter 611 in the winding device 100, the first pole piece can pass through the second abutting piece 612, and the cutter 611 can press and hold the first pole piece on the second abutting piece 612 and cut off when cutting the first pole piece; the material of the second abutting piece 612 can include plastic, metal or other materials.

[0200] The second abutting piece 612 can be a rectangular thin plate structure, a cylindrical structure or other structures; the second abutting piece 612 can be a fixed structure, or can be a rotatable structure to reduce the friction between the first pole piece and the second abutting piece 612.

[0201] The cutter 611 and the second abutting piece 612 are relatively spaced apart, and the first pole piece can pass through the space between the cutter 611 and the second abutting piece 612; when the cutter 611 rises, the distance between the cutter 611 and the second abutting piece 612 should be greater than the thickness of the first pole piece, so as to reduce the negative impact of the cutter 611 on the first pole piece.

[0202] The first pole piece cut by the cutter 611 and the second abutting piece 612 is laminated to the first diaphragm after being compounded by the first compound roller group 31, at this time the first diaphragm can carry the cut first pole piece to move to the second compound roller group 32 through the buffer assembly 80.

[0203] Some specific structures of the pole piece cutting assembly 61 are provided in the embodiment, the cutter 611 and the second abutting piece 612 are arranged between the first pole piece roller 11 and the first compound roller group 31, the second abutting piece 612 supports the first pole piece and provides support for the cutter 611 to cut the first pole piece, and the pole piece is cut by the cutter 611 to realize the cutting of the first pole piece.

[0204] Reference Figure 1In some embodiments, the winding device 100 further comprises a second cam cutter 613 and a third abutting piece 614 arranged between the second pole piece roller 12 and the second composite roller set 32, the second cam cutter 613 and the third abutting piece 614 are oppositely and spacedly arranged for the second pole piece to pass through, and the second cam cutter 613 is capable of rotating and cutting off the second pole piece on the third abutting piece 614.

[0205] The second cam cutter 613 and the third abutting piece 614 are both parts of the pole piece cutting assembly 61, and are used for cutting off the second pole piece.

[0206] The second cam cutter 613 refers to a structure for cutting off the second pole piece in the winding device 100, and the second cam cutter 613 is capable of intermittently acting and cutting off the second pole piece, and the length of the second pole piece cut off can be adjusted by adjusting the time of the second cam cutter 613 cutting off the second pole piece for two adjacent times. The cam cutter has the advantages of high efficiency, high precision, accurate intermittent indexing action, and stable rotation, and can accurately realize the periodic and interval cutting off of the second pole piece.

[0207] The periodic and interval cutting off of the second cam cutter 613 can be realized by various structures. For example, the second cam cutter 613 can comprise a driving device, a cam, a rocker arm, and a cutter, the driving device drives the cam to rotate and drives the rocker arm to reciprocate, so as to make the cutter cut off the second pole piece intermittently, and at this time, the intermittent time of the cutter = the length of the required second pole piece / the linear speed of the cam; for another example, the second cam cutter 613 can also comprise a driving device, a crank slider mechanism, and a cutter, the driving device drives the driving slider mechanism to move, so as to drive the cutter to reciprocate through the crank slider mechanism, and at this time, the intermittent time of the cutter = the length of the required second pole piece / the linear speed output by the driving device; it can be understood that the periodic and interval cutting off action of the second cam cutter 613 can also be realized by other structures, and is not limited to the above two kinds.

[0208] The third abutting piece 614 refers to a structure for supporting the second cam cutter 613 in the winding device 100, the second pole piece can pass through the third abutting piece 614, and the second cam cutter 613 can press and hold the second pole piece on the third abutting piece 614 and cut off the second pole piece when cutting off the second pole piece; the material of the third abutting piece 614 can include plastic, metal, or other materials.

[0209] The third abutting member 614 can be a cuboid thin plate structure, a cylindrical structure or other structures; the third abutting member 614 can be a fixed structure or a rotatable structure to reduce the friction between the second pole piece and the third abutting member 614; in some embodiments, the third abutting member 614 is a roller structure rotatably connected to the machine shell, and the second cam cutter 613 can press and hold the second pole piece on the roller structure and cut the second pole piece when cutting the second pole piece.

[0210] The second cam cutter 613 and the third abutting member 614 are oppositely spaced, and the second pole piece can pass through the space between the second cam cutter 613 and the third abutting member 614; when the second cam cutter 613 is raised, the distance between the second cam cutter 613 and the third abutting member 614 should be greater than the thickness of the second pole piece to reduce the negative impact of the second cam cutter 613 on the first pole piece.

[0211] The embodiment provides some specific structures of the pole piece cutting assembly 61, and the second cam cutter 613 and the third abutting member 614 are arranged between the second pole piece roller 12 and the second composite roller group 32, the third abutting member 614 supports the second pole piece and provides support for the second cam cutter 613 to cut the second pole piece, and the pole piece is cut by the second cam cutter 613 to achieve the cutting of the first pole piece. The intermittent indexing action of the cam cutter structure has high accuracy and does not need other structures to control the position at the intermittent time, which is convenient for control and can also simplify the structure of the cutter.

[0212] Reference Figure 1 In some embodiments, the first pole piece roller 11 and the first composite roller group 31, and the second pole piece roller 12 and the second composite roller group 32 are provided with a conveying structure 90 for conveying the first pole piece or the second pole piece.

[0213] The conveying structure 90 is a conveying structure for conveying the pole piece in the winding device 100, which can be a conveying belt, a reciprocating conveying trolley or other structures.

[0214] The conveying structure 90 is arranged between the first pole piece roller 11 and the first composite roller group 31 to convey the first pole piece; for example, the conveying structure 90 can be arranged between the cutter 611 and the first composite roller group 31, because the tail end of the first pole piece is not easy to fix after the first pole piece is cut by the cutter 611, conveying the cut first pole piece by the conveying structure 90 can fix the first pole piece, thereby reducing the activity of the tail end of the first pole piece.

[0215] The conveying structure 90 can also be disposed between the second pole piece roller 12 and the second composite roller group 32 for conveying the second pole piece; in some embodiments, the conveying structure 90 can be disposed between the second cam cutter 613 and the second composite roller group 32. Since the tail end of the second pole piece is not easily fixed after being cut by the second cam cutter 613, conveying the cut second pole piece through the conveying structure 90 can play a role in fixing the second pole piece, thereby reducing the movement of the tail end of the second pole piece; in other embodiments, the conveying structure 90 can be provided both upstream and downstream of the second cam cutter 613, that is, the conveying structure 90 is provided both between the second pole piece roller 12 and the second cam cutter 613 and between the second cam cutter 613 and the second composite roller group 32 to convey the second pole piece more stably.

[0216] In some specific embodiments, the conveying structure 90 is a vacuum adsorption conveyor belt. The principle of the vacuum adsorption conveyor belt is to use vacuum adsorption to adsorb materials on the conveyor belt and convey the materials to the required positions through the conveyor belt; the conveying structure 90 being a vacuum adsorption conveyor belt enables the conveying structure 90 to not only convey the first pole piece and the second pole piece, but also adsorb impurities such as metal chips and dust that may be generated during the cutting of the first pole piece and the second pole piece, thereby reducing the possible negative impacts on the pole piece, the diaphragm and the processing environment.

[0217] In this embodiment, the second pole piece and the first pole piece are conveyed through the conveying structure 90 to increase the stability of conveying and reduce the occurrence of situations such as the lack of conveying power after the pole piece is cut.

[0218] According to some embodiments of the present application, refer to Figure 1 , Figure 1 is a schematic structural diagram of the winding device 100 provided by some embodiments of the present application.

[0219] In some embodiments of the present application, the winding device 100 further includes a first detection device 71 disposed between the second composite roller group 32 and the winding assembly 40.

[0220] The first detection device 71 is included in the detection assembly 70. The first detection device 71 refers to a structure in the winding device 100 for detecting the composite structure. The first detection device 71 can include a camera, a machine vision detection device or other structures. The first detection device 71 can also include other devices such as a control device. The first detection device 71 can obtain image information (such as position, color, shape, etc.) of the relative composite structure and can convert the image information into a digital signal and send it to the control device so that the control device can judge whether the composite structure meets the requirements according to a preset program. <0​The first detection device 71 is arranged between the second composite roller set 32 and the winding assembly 40; for example, the first detection device 71 can be arranged between the second composite roller set 32 and the diaphragm cutting assembly 62, or arranged between the diaphragm cutting assembly 62 and the winding assembly 40.

[0222] The first detection device 71 arranged at this position can detect the state of the composite structure after being compounded by the second composite roller set 32, and can more comprehensively detect the state of the entire composite structure passing through; since the composite structure after being compounded will enter the winding needle 42 for winding, the head end of the composite structure will not be easily detected after entering the winding needle 42, and since the positions of the pole piece and the diaphragm in the composite structure after being compounded are relatively stable and are not prone to displacement, misalignment, etc., the state of the composite structure detected by the first detection device 71 arranged between the second composite roller set 32 and the winding assembly 40 is less different or the same as the state of the composite structure after being wound, and the detection result of the first detection device 71 can have higher accuracy, and the detection of the composite structure is more comprehensive.

[0223] In this embodiment, the first detection device 71 is arranged between the second composite roller set 32 and the winding assembly 40 to detect the composite structure after being compounded, and the positions of the pole piece and the diaphragm in the composite structure after being compounded by the second composite roller set 32 are relatively fixed and not prone to deviation, and the structure of the composite structure after being detected by the first detection device 71 is also not prone to change, and the detection result is relatively accurate, and at the same time, arranging the first detection device 71 upstream of the winding assembly 40 also enables the first detection device 71 to more comprehensively detect the composite structure, reduces the area of dead angles or undetectable positions, and improves the accuracy of the first detection device 71.

[0224] In some embodiments, the winding device 100 further comprises a second detection device 72 arranged between the first composite roller set 31 and the second composite roller set 32.

[0225] The second detection device 72 is included in the detection assembly 70, and the second detection device 72 refers to a structure for detecting the first pole piece and the first diaphragm after being compounded in the winding device 100, the second detection device 72 can include a camera, a machine vision detection device or other structures, and the second detection device 72 can further include a control device and other devices, the second detection device 72 can obtain image information (such as position, color, shape, etc.) of the relative first pole piece and the first diaphragm, and can convert the image information into a digital signal and send it to the control device, so that the control device can determine whether the first pole piece and the first diaphragm meet the requirements according to the preset program.

[0226] The second detection device 72 is arranged between the first composite roller group 31 and the second composite roller group 32; for example, the second detection device 72 can be arranged between the first composite roller group 31 and the buffer assembly 80, or arranged between the buffer assembly 80 and the second composite roller group 32.

[0227] The second detection device 72 arranged at this position can detect the state of the first pole piece and the diaphragm after being compounded by the first composite roller group 31, so as to detect the state of the first pole piece and the diaphragm, and detect the compounding effect of the first pole piece and the diaphragm, so as to make a timely response when the structure of the first pole piece, the diaphragm or both after compounding is abnormal, thereby reducing the negative impact on the subsequent process.

[0228] In this embodiment, the second detection device 72 is arranged between the first composite roller group 31 and the second composite roller group 32, so as to detect the first pole piece and the diaphragm after compounding by the second detection assembly 70; if the structure of the first pole piece, the diaphragm or both after compounding is abnormal, it can be found in time through the second detection device 72, thereby reducing the negative impact on the subsequent process.

[0229] According to some embodiments of the present application, with reference to Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 , the first unwinding assembly 10 includes a first pole piece roller 11 and a second pole piece roller 12, the second unwinding assembly 20 includes a first diaphragm roller 21 and a second diaphragm roller 22, the compounding assembly 30 includes a first composite roller group 31 and a second composite roller group 32, the pole piece cutting assembly 61 includes a cutting knife 611 and a second abutting piece 612 arranged opposite and spaced apart, a second cam cutting knife 613 and a third abutting piece 614 arranged opposite, the winding assembly 40 includes a base 41 and five winding needles 42 arranged on the base 41, and the winding assembly 40 further includes a tailing roller 431 and a rubber coating roller 432; the base 41 is further provided with a material feeding assembly 50.

[0230] The first pole piece and the first diaphragm wound on the first pole piece roller 11 and the first diaphragm roller 21 are compounded at the first composite roller group 31, the cutting knife 611 and the second abutting piece 612 are arranged between the first pole piece roller 11 and the first composite roller group 31 to cut the first pole piece; the second pole piece wound on the second pole piece roller 12 is cut by the cooperation of the second cam cutting knife 613 and the third abutting piece 614; the compounded first pole piece and the first diaphragm are compounded with the cut second pole piece and the second diaphragm at the second composite roller group 32 to form a composite structure, in which the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are arranged in sequence; the first cam cutting knife 621 arranged between the second composite roller group 32 and the winding assembly 40 cooperates with the first abutting piece 622 to cut the first diaphragm and the second diaphragm in the composite structure to form a single complete composite structure.

[0231] The composite structure cut by the first cam cutter 621 and the first abutting piece 622 is wound by the winding needle 42, and when the winding of the winding needle 42 is completed, the winding needle 42 sequentially passes through the finishing roller 431, the rubberizing roller 432, the blanking assembly 50 and a vacant position, and is stopped at the side of the finishing roller 431, the side of the rubberizing roller 432, the side of the blanking assembly 50 and the vacant position, wherein the vacant position is used to move the blanked winding needle 42 to the avoiding part 411; the blanking assembly 50 takes down the composite structure on the winding needle 42 and forms a vacant winding needle 42, and the vacant winding needle 42 can move to the side of the second composite roller set 32 to wind the composite structure again.

[0232] The first detection device 71 is arranged between the second composite roller set 32 and the winding assembly 40, and the second detection device 72 is arranged between the first composite roller set 31 and the buffering assembly 80.

[0233] The vacuum suction conveying belt 90 is arranged between the cutter 611 and the first composite roller set 31, between the second diaphragm roller 22 and the first cam cutter 621, and between the first cam cutter 621 and the second composite roller set 32.

[0234] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; 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 be included in the protection scope of the present application.

Claims

1. A winding apparatus characterized by comprising: The application relates to a winding device for winding a first electrode sheet and a first diaphragm, comprising: a first unwinding assembly for winding the first electrode sheet; a second unwinding assembly for winding the first diaphragm; a composite assembly for laminating the first electrode sheet and the first diaphragm; a winding assembly arranged downstream of the composite assembly, wherein the winding assembly comprises a base and at least two winding needles, the winding needles are rotationally connected to the base, and the base is used to drive different winding needles to move to one side of the composite assembly alternately.

2. The winding apparatus according to claim 1, characterized by, The winding assembly comprises a tailing structure arranged on one side of the base. The base is used to drive different winding needles to move to one side of the composite assembly and one side of the tailing structure alternately, so that one winding needle is located on one side of the composite assembly and another winding needle is located on one side of the tailing structure.

3. The winding apparatus according to claim 2, characterized by, The tailing structure comprises a tailing roller arranged on one side of the base, and the tailing roller is used to press the first electrode sheet and the first diaphragm.

4. The winding apparatus according to claim 3, characterized by The tailing structure further comprises a rubberizing roller arranged on one side of the base, and the rubberizing roller is used to fix the first diaphragm to the first electrode sheet.

5. The winding apparatus according to claim 4, characterized by The winding assembly comprises at least three winding needles, and different winding needles can be located on one side of the composite assembly, the tailing roller and the rubberizing roller respectively.

6. The winding apparatus according to claim 4, characterized by The winding device further comprises a discharging assembly. The winding assembly comprises at least four winding needles, and different winding needles can be located on one side of the composite assembly, the tailing roller, the rubberizing roller and the discharging assembly respectively.

7. The winding apparatus according to claim 6, characterized by The composite assembly, the tailing roller, the rubberizing roller and the discharging assembly are arranged along a circular track in sequence, and the base can drive the winding needles to move along the circular track.

8. The winding apparatus according to claim 1, characterized by, The base further comprises a position-avoiding part arranged beside the winding needles, the winding needles can enter the position-avoiding part, and the winding needles can move out of the position-avoiding part.

9. The winding apparatus according to claim 1, characterized by, The winding needle comprises a main body and a fixing groove arranged on the main body, the main body can rotate relative to the base to wind the first electrode sheet and the first diaphragm, and the fixing groove is used to accommodate part of the first electrode sheet and part of the first diaphragm.

10. The winding apparatus according to claim 1, characterized by, The winding device further comprises a first electrode sheet cutting assembly and a first diaphragm cutting assembly, the first electrode sheet cutting assembly is arranged between the first unwinding assembly and the composite assembly, and the first diaphragm cutting assembly is arranged upstream of the winding assembly.

11. The winding apparatus according to claim 10, characterized by The first diaphragm cutting assembly comprises a first cam cutter and a first abutting part arranged in a spaced relationship, the first cam cutter can move and cut the first diaphragm on the first abutting part.

12. The winding apparatus according to claim 1, characterized by, The winding device further comprises a detection assembly arranged between the composite assembly and the winding assembly.

13. The winding apparatus according to any one of claims 1 to 12, characterized by, The first unwinding assembly comprises a first electrode sheet roller for winding a first electrode sheet; The second unwinding assembly comprises a first diaphragm roller for winding a first diaphragm; The composite assembly comprises a first composite roller group for laminating the first electrode sheet and the first diaphragm.

14. The winding apparatus according to claim 13, characterized by The first unwinding assembly further comprises a second electrode sheet roller for winding a second electrode sheet; The second unwinding assembly further comprises a second diaphragm roller for winding a second diaphragm; The composite assembly further comprises a second composite roller set for laminating the first separator, the second pole piece and the second separator.

15. The winding apparatus according to claim 14, characterized by The winding device further comprises a buffer assembly disposed between the first composite roller set and the second composite roller set, and the buffer assembly is used for winding the first pole piece and the first separator.

16. The winding apparatus according to claim 15, characterized by The buffer assembly comprises a fixed roller and a floating roller, the position of the fixed roller is fixed relative to the first composite roller set, and the floating roller can be close to or away from the fixed roller to change the length of the first pole piece and the first separator wound in the buffer assembly.

17. The winding apparatus according to claim 14, characterized by, The winding device further comprises a cutter and a second abutting piece disposed between the first pole piece roller and the first composite roller set, the cutter and the second abutting piece are oppositely and spacedly arranged to pass the first pole piece, and the cutter is used for cutting off the first pole piece on the second abutting piece.

18. The winding apparatus according to claim 14, characterized by, The winding device further comprises a second cam cutter and a third abutting piece disposed between the second pole piece roller and the second composite roller set, the second cam cutter and the third abutting piece are oppositely and spacedly arranged to pass the second pole piece, and the second cam cutter can rotate and cut off the second pole piece on the third abutting piece.

19. The winding apparatus according to claim 14, characterized by, Conveying structures are disposed between the first pole piece roller and the first composite roller set and between the second pole piece roller and the second composite roller set, and the conveying structures are used for conveying the first pole piece or the second pole piece.

20. The winding apparatus according to claim 14, characterized by, The winding device further comprises a first detection device disposed between the second composite roller set and the winding assembly.

21. The winding apparatus according to claim 14, characterized by, The winding device further comprises a second detection device disposed between the first composite roller set and the second composite roller set.

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