Winding device

Abstract

The invention discloses winding equipment. The winding equipment comprises a rotating part, a winding needle and a fixing device, the rotating part can rotate in the first direction, the winding needle is rotatably arranged on the rotating part and can rotate along with the rotating part so as to be switched from a winding station to an ending station, and the fixing device is arranged on the rotating part and located on the radial side of the winding needle. The fixing device is used for fixing the ending end of the electrode assembly in the process that the winding needle is switched from the winding station to the ending station. In the winding equipment provided by the embodiment of the invention, when the winding needle is switched from the winding station to the ending station, the ending end part of the electrode assembly is fixed through the fixing device, so that the probability that the ending end part of the electrode assembly swings or deviates is reduced. Therefore, the probability that the ending end of the electrode assembly deviates from the correct position can be reduced, and the yield of the wound electrode assembly is improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to a winding device. Background Art

[0002] The electrode assembly can be wound by winding. In the related art, the winding equipment is provided with a winding needle, which can be switched between a winding station and a finishing station. When the winding needle is in the winding station, the winding needle can wind the electrode assembly, and when the winding needle is switched to the finishing station, the winding needle can wind the finishing end of the electrode assembly. However, in the process of switching the winding needle from the winding station to the finishing station, the finishing end of the electrode assembly may have a large swing range, resulting in a low yield of the electrode assembly after winding. Summary of the invention

[0003] The present invention provides a winding device that can solve the problem that during the process of switching the winding needle from the winding station to the finishing station, the tail end of the electrode assembly may have a large swing range, resulting in a low yield of the electrode assembly after winding.

[0004] The winding equipment of an embodiment of the present invention includes a rotating member, a winding needle and a fixing device. The rotating member can rotate in a first direction. The winding needle is rotatably arranged on the rotating member. The winding needle can rotate with the rotating member to switch from the winding station to the finishing station. The fixing device is arranged on the rotating member and is located on the radial side of the winding needle. The fixing device is used to fix the finishing end of the electrode assembly during the process of switching the winding needle from the winding station to the finishing station.

[0005] In the winding device of the embodiment of the present invention, when the winding needle switches from the winding station to the finishing station, the finishing end of the electrode assembly is fixed by the fixing device, thereby reducing the probability of the finishing end of the electrode assembly swinging or deviating. This can reduce the probability of the finishing end of the electrode assembly deviating from the correct position, thereby improving the yield of the electrode assembly after winding.

[0006] In certain embodiments, the fixing device fixes the tail end of the electrode assembly by vacuum adsorption.

[0007] In this way, the tail end of the electrode assembly is fixed to the fixing device by vacuum adsorption, which can effectively limit the position of the tail end, thereby effectively reducing the probability of the electrode assembly swinging or deflecting during the winding process, thereby improving the yield of the electrode assembly after winding. At the same time, the vacuum adsorption method is convenient for adjusting the adsorption force, avoiding the inability of the fixing device to stably adsorb the tail end due to insufficient adsorption force, and also avoiding excessive adsorption force that causes damage to the electrode assembly.

[0008] In some embodiments, the fixing device is located on a side of the winding needle facing a second direction, and the second direction is opposite to the first direction.

[0009] In this way, the fixing device can adsorb and fix the end of the electrode assembly when the winding needle rotates in the first direction, reducing the probability of the end swinging or deflecting. This can reduce the probability of the end of the electrode assembly deviating from the correct position, thereby improving the yield of the electrode assembly after winding.

[0010] In certain embodiments, when the winding needle is in the winding station, the winding needle fixes the winding end of the electrode assembly by vacuum adsorption.

[0011] In this way, vacuum adsorption is used to allow the rolling end of the electrode assembly to be adsorbed on the surface of the winding needle, thereby avoiding the clamping needle structure in conventional technology. The winding action can be completed without stopping the machine, thereby improving the winding efficiency of the winding equipment.

[0012] In certain embodiments, the winding device includes an auxiliary device disposed on a rotating member, the auxiliary device being located on one radial side of the winding needle, and when the winding needle is in the winding station, the auxiliary device fits the winding end of the electrode assembly with the winding needle.

[0013] In this way, the auxiliary device can enable the rolling end of the electrode assembly to stably perform the winding action, reduce the probability of the rolling end deviating from the correct position, and thus improve the winding quality of the winding equipment.

[0014] In some embodiments, the auxiliary device includes a fixed portion and a movable portion that moves relative to the fixed portion, the fixed portion is mounted on a rotating member, and the movable portion is used to drive the rolling end of the electrode assembly to fit with the rolling needle during movement relative to the fixed portion.

[0015] In this way, the moving part of the auxiliary device can enable the winding end of the electrode assembly to stably perform the winding action, reduce the probability of the winding end deviating from the correct position, and thus improve the winding quality of the winding equipment.

[0016] In certain embodiments, the fixing portion is movable relative to the rotating member to correct the position of the winding end portion of the electrode assembly while driving the winding end portion of the electrode assembly to move toward the winding needle.

[0017] In this way, the fixed part of the auxiliary device can drive the moving part to move relative to the rotating part, so that the winding end of the electrode assembly can stably perform the winding action, reducing the probability of the winding end deviating from the correct position, thereby improving the winding quality of the winding equipment.

[0018] In certain embodiments, the auxiliary device blows air toward the winding needle to blow the electrode assembly toward the winding needle.

[0019] In this way, the auxiliary device can cooperate with the winding needle so that the winding end of the electrode assembly can stably complete the winding action, reducing the probability of the winding end deviating from the correct position, thereby improving the winding quality of the winding equipment.

[0020] In certain embodiments, when the winding needle is at the finishing position, the auxiliary device is used to apply a force to the finishing end of the electrode assembly to maintain the winding trend.

[0021] In this way, the auxiliary device can make the electrode assembly tightly wound together, reduce the probability of the electrode assembly falling apart, and thus improve the quality of the electrode assembly.

[0022] In certain embodiments, the number of winding needles, fixing devices and auxiliary devices are all multiple and arranged one by one, and the multiple winding needles, multiple fixing devices and multiple auxiliary devices are arranged at intervals along the rotation direction of the rotating member.

[0023] In this way, the design of multiple winding needles, multiple fixing devices and multiple auxiliary devices allows multiple electrode assemblies to be wound at the same time, that is, multiple electrode assemblies can be processed at the same time, which significantly improves the production capacity of the winding equipment. In addition, different winding needles, fixing devices and auxiliary devices can work at different stations at the same time, so the winding of multiple electrode assemblies can be performed in parallel, which improves the production efficiency of the winding equipment.

[0024] In certain embodiments, the winding device includes a feeding device disposed on one side of the rotating member, and the feeding device is used to transport the electrode assembly to the winding needle at the winding station.

[0025] In this way, the feeding device can transfer the electrode assembly located outside the rotating member to the winding needle at the winding station for winding.

[0026] In certain embodiments, the feeding device includes a limiting mechanism, and the limiting mechanism is used to limit the position of the rolling end of the electrode assembly.

[0027] In this way, the limiting mechanism can limit the position of the electrode assembly, thereby reducing the probability of the electrode assembly swinging or deflecting. This can improve the stability of the electrode assembly when it enters the winding needle, reduce the probability of the winding end of the electrode assembly deviating from the correct position, and thus improve the yield of the electrode assembly after winding.

[0028] In some embodiments, the limiting mechanism includes a conveyor belt, which is used to convey the rolled end of the electrode assembly to the winding needle. The conveyor belt is provided with adsorption holes, which are used to form negative pressure and adsorb the electrode assembly.

[0029] In this way, the conveyor belt can make the electrode assembly move along a specific trajectory when entering the winding needle, ensuring the transmission efficiency of the electrode assembly, and can limit the position of the electrode assembly through multiple adsorption holes, thereby effectively reducing the probability of the electrode assembly swinging or deflecting during the winding process, thereby improving the yield of the electrode assembly after winding.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic structural diagram of a winding device provided in some embodiments of the present invention;

[0033] Figure 2 yes Figure 1 An enlarged schematic diagram of part I;

[0034] Figure 3 is a schematic diagram of a fixing device adsorbing an electrode assembly provided in some embodiments of the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the winding device provided in some embodiments of the present invention.

[0036] Description of reference numerals:

[0037] Winding device 100; rotating part 10; winding needle 20; fixing device 30; first adsorption hole 31; auxiliary device 40; fixing part 41; moving part 42; feeding device 50; limiting mechanism 51; conveyor belt 52; first direction 61; second direction 62; winding station 110; finishing station 120; electrode assembly 200; finishing end 201; winding end 202; positive electrode sheet 210; negative electrode sheet 220; diaphragm 230. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. 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 indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0045] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0046] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0047] In the winding process of the battery manufacturing process, the electrode assembly is transferred to the winding device for winding to form one or more electrode assemblies. After one electrode assembly is wound, the electrode assembly needs to be cut to separate two different electrode assemblies.

[0048] However, after the electrode assembly is cut off, the tail end of the previous electrode assembly is in a free state, or in other words, the tail end of the previous electrode assembly is prone to swing or deflection.

[0049] This swing or deviation of the tail end will lead to an increased risk of OH (overhang, negative electrode overload), which is specifically manifested as OH being lower than the lower limit, thereby adversely affecting the yield of the winding process and even affecting the energy density of the electrode assembly.

[0050] Among them, OH refers to the fact that the negative electrode sheet in the electrode assembly has a part of the positive electrode sheet in the length and width direction. The lower limit of OH can ensure that the negative electrode sheet and the positive electrode sheet maintain a certain relative position, otherwise it is easy to cause poor lithium deposition. Specifically, there is an offset in the length or width direction between the two electrode sheets, and lithium ions are not transferred from one electrode sheet to another, but are deposited in the area outside the electrode sheet, thereby generating lithium crystals, causing the electrode assembly formed by the electrode sheet to be punctured, cut, and other defects, which in turn leads to safety risks in the electrode assembly.

[0051] Therefore, in order to solve the problem that the tail end of the electrode assembly may swing, resulting in the electrode assembly after winding not being in the correct position, and further resulting in a decrease in the yield of the winding process, the present invention provides the following technical solution.

[0052] The winding device disclosed in the present invention can be used in the winding process in the battery manufacturing process, and can be specifically used for winding the electrode assembly. In the battery manufacturing process, the electrode assembly is wound by the winding device to form the electrode assembly.

[0053] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of a winding device 100 provided in some embodiments of the present invention. The winding device 100 of the embodiment of the present invention comprises a rotating member 10, a winding needle 20 and a fixing device 30, the rotating member 10 can rotate along a first direction 61, the winding needle 20 is rotatably arranged on the rotating member 10, the winding needle 20 can rotate with the rotating member 10 to switch from the winding station 110 to the finishing station 120, the fixing device 30 is arranged on the rotating member 10 and is located on one radial side of the winding needle 20, and the fixing device 30 is used to fix the finishing end 201 of the electrode assembly 200 during the process of the winding needle 20 switching from the winding station 110 to the finishing station 120.

[0054] Specifically, the winding device 100 is a device for winding the electrode assembly 200 together to form a wound electrode assembly 200. The rotating member 10 is a device that rotates in the winding device 100. The rotating member 10 can be used to carry the winding needle 20 and the fixing device 30. The rotating member 10 can rotate around its own center to drive the winding needle 20 and the fixing device 30 to rotate, so that the winding needle 20 and the fixing device 30 can move from the winding station 110 to the finishing station 120 with the rotating member 10. The shape of the rotating member 10 can be a regular shape such as a circle or a square, or it can be an irregular shape.

[0055] The winding station 110 is a station for winding the electrode assembly 200. At the winding station 110, the flattened electrode assembly 200 can be wound by the winding needle 20 to form a wound electrode assembly 200. The finishing station 120 is a station for finishing the finishing end 201 of the electrode assembly 200. At the finishing station 120, the finishing end 201 of the electrode assembly 200 can be fixed by gluing or the like to prevent the electrode assembly 200 from spreading, so as to improve the quality of the electrode assembly 200.

[0056] See also Figure 2 , Figure 2 yes Figure 1The electrode assembly 200 includes a positive electrode sheet 210, a negative electrode sheet 220 and a separator 230, and the positive electrode sheet 210, the negative electrode sheet 220 and the separator 230 are stacked. The electrode assembly 200 is wrapped from the inside to the outside as a separator 230, a positive electrode sheet 210, a separator 230, and a negative electrode sheet 220. In the electrode assembly 200, the positive electrode sheet 210 and the negative electrode sheet 220 are separated by the separator 230 to prevent the internal short circuit of the battery, while allowing the electrolyte ions to pass freely to complete the electrochemical charge and discharge process.

[0057] The winding needle 20 is a device for winding in the winding device 100. The winding needle 20 can be rotatably mounted on the rotating member 10 by means of bearing connection, gear connection, etc. The winding needle 20 rotates relative to the rotating member 10, thereby driving the electrode assembly 200 wound on the winding needle 20 to be wound together to form the electrode assembly 200. The shape of the winding needle 20 can be a regular shape such as a cylinder, a cone, or an irregular shape. According to the different shapes of the winding needle 20, the electrode assembly 200 can present different shapes.

[0058] The fixing device 30 is a device for fixing the tail end 201 of the electrode assembly 200 in the winding device 100. The fixing device 30 can fix the tail end 201 of the electrode assembly 200 by adsorption, clamping, etc. The shape of the fixing device 30 can be circular, elliptical, rounded rectangular, etc. The fixing device 30 can be installed on the rotating member 10 by fasteners such as bolts. The length and width of the fixing device 30 can be set according to the distance between the fixing device 30 and the winding needle 20, and the height of the fixing device 30 can be set according to the height of the electrode assembly 200.

[0059] In the winding device 100 of the embodiment of the present invention, when the winding needle 20 is switched from the winding station 110 to the finishing station 120, the finishing end 201 of the electrode assembly 200 is fixed by the fixing device 30, thereby reducing the probability of the finishing end 201 of the electrode assembly 200 swinging or deflecting. This can reduce the probability of the finishing end 201 of the electrode assembly 200 deviating from the correct position, thereby improving the yield of the electrode assembly 200 after winding.

[0060] See also Figure 1 and Figure 3 , Figure 3 Schematic diagram of the fixing device 30 provided in some embodiments of the present invention adsorbing the electrode assembly 200. In some embodiments, the fixing device 30 fixes the end portion 201 of the electrode assembly 200 by vacuum adsorption.

[0061] Specifically, the fixing device 30 can be formed with a plurality of first adsorption holes 31, and the first adsorption holes 31 are used to form negative pressure. The number of the first adsorption holes 31 can be two, three, four or even more. The number of the first adsorption holes 31 can be set according to the structure and shape of the electrode assembly 200, so as to avoid damaging the battery electrode while adsorbing the electrode assembly 200.

[0062] A chamber may be formed inside the fixture 30, and the first adsorption hole 31 may be an opening of the chamber. The first adsorption hole 31 may generate negative pressure by connecting to a vacuum pump or a vacuum system, and the vacuum pump creates a low-pressure area by extracting air in the chamber, so that the electrode assembly 200 is adsorbed on the fixture 30. The adsorption force may be adjusted by the vacuum pump to adapt to electrode assemblies 200 of different structures and shapes.

[0063] In this way, the tail end 201 of the electrode assembly 200 is fixed to the fixing device 30 by vacuum adsorption, which can effectively limit the position of the tail end 201, thereby effectively reducing the probability of the electrode assembly 200 swinging or deflecting during the winding process, thereby improving the yield of the electrode assembly 200 after winding. At the same time, the vacuum adsorption method is used to facilitate the adjustment of the adsorption force, so as to avoid the fixing device 30 from having insufficient adsorption force and being unable to stably adsorb the tail end 201, and to avoid excessive adsorption force causing damage to the electrode assembly 200.

[0064] See also Figure 1 In some embodiments, the fixing device 30 is located on the side of the winding needle 20 facing the second direction 62 , and the second direction 62 is opposite to the first direction 61 .

[0065] Specifically, when the first direction 61 is counterclockwise and the second direction 62 is clockwise, after the electrode assembly 200 completes the winding process at the winding station 110, the rotating member 10 drives the winding needle 20 to rotate along the first direction 61 to the finishing station 120. During the rotation process, the finishing end 201 of the electrode assembly 200 is located in the second direction 62 of the winding needle 20. At this time, the fixing device 30 can adsorb and fix the finishing end 201 of the electrode assembly 200.

[0066] In this way, the fixing device 30 can adsorb and fix the end portion 201 of the electrode assembly 200 when the winding needle 20 rotates toward the first direction 61, thereby reducing the probability of the end portion 201 swinging or deviating. This can reduce the probability of the end portion 201 of the electrode assembly 200 deviating from the correct position, thereby improving the yield of the electrode assembly 200 after winding.

[0067] Please continue reading Figure 1In some embodiments, when the winding needle 20 is in the winding station 110, the winding needle 20 fixes the winding end 202 of the electrode assembly 200 by vacuum adsorption.

[0068] Specifically, the winding needle 20 can be formed with a plurality of second adsorption holes (not shown), and the second adsorption holes are used to form negative pressure. The number of the second adsorption holes can be two, three, four or even more. The number of the second adsorption holes can be set according to the structure and shape of the electrode assembly 200, so as to avoid damaging the battery electrode while adsorbing the electrode assembly 200.

[0069] The winding needle 20 may have a chamber formed inside, and the second adsorption hole may be an opening of the chamber. The second adsorption hole may generate negative pressure by connecting to a vacuum pump or a vacuum system, and the vacuum pump creates a low-pressure area by extracting air in the chamber, so that the electrode assembly 200 is adsorbed on the winding needle 20. The adsorption force may be adjusted by the vacuum pump to adapt to electrode assemblies 200 of different structures and shapes.

[0070] In this way, vacuum adsorption is used to allow the rolling end 202 of the electrode assembly 200 to be adsorbed on the surface of the winding needle 20, thereby avoiding the clamping needle structure in conventional technology. The winding action can be completed without stopping the machine, thereby improving the winding efficiency of the winding device 100.

[0071] Please refer again Figure 1 In some embodiments, the winding device 100 includes an auxiliary device 40 disposed on the rotating member 10, and the auxiliary device 40 is located on one radial side of the winding needle 20. When the winding needle 20 is in the winding station 110, the auxiliary device 40 fits the winding end 202 of the electrode assembly 200 with the winding needle 20.

[0072] Specifically, the auxiliary device 40 is a device in the winding device 100 that assists the winding end 202 of the electrode assembly 200 in the winding action. The auxiliary device 40 can be a pressure roller assembly, a blowing device, or other types of devices.

[0073] The auxiliary device 40 is located on a side of the electrode assembly 200 away from the winding needle 20 at the winding station 110. When the winding end 202 of the electrode assembly 200 moves toward the winding needle 20 at the winding station 110, the auxiliary device 40 can apply an external force toward the winding needle 20 to the winding end 202, so that the winding end 202 can be adsorbed on the surface of the winding needle 20.

[0074] In this way, the auxiliary device 40 can enable the winding end 202 of the electrode assembly 200 to stably perform the winding action, reduce the probability of the winding end 202 deviating from the correct position, and thus improve the winding quality of the winding device 100.

[0075] See also Figure 1 In some embodiments, the auxiliary device 40 includes a fixed portion 41 and a movable portion 42 that moves relative to the fixed portion 41. The fixed portion 41 is installed on the rotating member 10, and the movable portion 42 is used to drive the rolling end 202 of the electrode assembly 200 to fit with the rolling needle 20 during the movement relative to the fixed portion 41.

[0076] Specifically, when the auxiliary device 40 is a pressure roller assembly, the fixed part 41 may be a cylinder, the movable part 42 may be a piston rod, one end of the piston rod may be provided with a pressure roller, the pressure roller is rotatably provided at the end of the piston rod, and the cylinder can drive the pressure roller to approach or move away from the winding needle 20. When the winding end 202 of the electrode assembly 200 moves toward the winding needle 20 at the winding station 110, the cylinder can drive the pressure roller to fit on the winding needle 20, so that the winding end 202 fits on the winding needle 20 to perform the winding action. After the winding action is completed, the pressure roller moves away from the winding needle 20 to avoid blocking the winding needle 20 from winding the electrode assembly 200.

[0077] In this way, the moving portion 42 of the auxiliary device 40 can enable the winding end 202 of the electrode assembly 200 to stably perform the winding action, reducing the probability of the winding end 202 deviating from the correct position, thereby improving the winding quality of the winding device 100.

[0078] In some embodiments, the fixing portion 41 is movable relative to the rotating member 10 to correct the position of the winding end portion 202 of the electrode assembly 200 while driving the winding end portion 202 of the electrode assembly 200 to move toward the winding needle 20 .

[0079] Specifically, the cylinder body can move radially along the winding needle 20 relative to the rotating part 10. When the cylinder body moves close to the winding needle 20, it can drive the pressure roller to approach the winding needle 20 and fit on the winding needle 20, so as to fit the winding end 202 of the electrode assembly 200 on the winding needle 20 for winding. When the cylinder body moves away from the winding needle 20, it can drive the pressure roller away from the winding needle 20 to prevent the pressure roller from blocking the winding needle 20 from winding the electrode assembly 200.

[0080] In this way, the fixed part 41 of the auxiliary device 40 can drive the movable part 42 to move relative to the rotating part 10, so that the rolling end 202 of the electrode assembly 200 can stably perform the rolling action, reducing the probability of the rolling end 202 deviating from the correct position, thereby improving the winding quality of the winding equipment 100.

[0081] See also Figure 4 , Figure 4 1 is a schematic diagram of the structure of the winding device 100 provided in some embodiments of the present invention. In some embodiments, the auxiliary device 40 blows air toward the winding needle 20 to blow the electrode assembly 200 toward the winding needle 20 .

[0082] Specifically, when the auxiliary device 40 is a blowing device, the blowing device includes a high-pressure gas nozzle, which is connected to an external high-pressure pump to provide high-pressure gas. The spray direction of the high-pressure gas nozzle is on the side of the electrode assembly 200 away from the winding needle 20 of the winding station 110, thereby applying an airflow toward the surface of the winding needle 20 to the electrode assembly 200.

[0083] During the movement of the rolling end 202 of the electrode assembly 200 toward the winding needle 20, the rolling end 202 is in a free state, and the auxiliary device 40 can blow air toward the rolling end 202. At this time, under the action of the high-pressure airflow, the rolling end 202 can be attached to the surface of the winding needle 20 located at the winding station 110. Under the joint action of the vacuum adsorption of the winding needle 20 and the auxiliary device 40, the rolling end 202 can stably perform the winding action.

[0084] In this way, the auxiliary device 40 can cooperate with the winding needle 20 so that the winding end 202 of the electrode assembly 200 can stably complete the winding action, reducing the probability of the winding end 202 deviating from the correct position, thereby improving the winding quality of the winding device 100.

[0085] In certain embodiments, when the winding needle 20 is at the finishing station 120 , the auxiliary device 40 is used to apply a force to the finishing end 201 of the electrode assembly 200 to maintain the winding trend.

[0086] Specifically, when the winding needle 20 is in the finishing station 120 , the cylinder body may drive the pressure roller to fit the finishing end 201 of the electrode assembly 200 , or the blowing device may blow air toward the finishing end 201 of the electrode assembly 200 , so that the finishing end 201 of the electrode assembly 200 fits onto the electrode assembly 200 .

[0087] In this way, the auxiliary device 40 can make the electrode assembly 200 tightly wound together, reduce the probability of the electrode assembly 200 falling apart, and thus improve the quality of the electrode assembly 200.

[0088] See also Figure 1 In some embodiments, the number of winding needles 20, fixing devices 30 and auxiliary devices 40 are multiple and are arranged one by one. The multiple winding needles 20, multiple fixing devices 30 and multiple auxiliary devices 40 are arranged at intervals along the rotation direction of the rotating member 10.

[0089] Specifically, the number of the winding needles 20, the fixing devices 30 and the auxiliary devices 40 may be two, three, four or even more. For example, the number of the winding needles 20, the fixing devices 30 and the auxiliary devices 40 may be five, and the five winding needles 20, the five fixing devices 30 and the five auxiliary devices 40 may be arranged at intervals along the circumference of the rotating member 10. The spacing between adjacent winding needles 20, the fixing devices 30 and the auxiliary devices 40 may be equal or unequal, and the embodiments of the present invention are not limited to this.

[0090] Thus, the design of multiple winding needles 20, multiple fixing devices 30 and multiple auxiliary devices 40 allows multiple electrode assemblies 200 to be wound simultaneously, that is, multiple electrode assemblies 200 can be processed at the same time, which significantly improves the production capacity of the winding device 100. In addition, different winding needles 20, fixing devices 30 and auxiliary devices 40 can work at different stations at the same time, so the winding of multiple electrode assemblies 200 can be performed in parallel, which improves the production efficiency of the winding device 100.

[0091] See also Figure 1 In some embodiments, the winding device 100 includes a feeding device 50 disposed on one side of the rotating member 10 , and the feeding device 50 is used to transport the electrode assembly 200 to the winding needle 20 at the winding station 110 .

[0092] Specifically, the feeding device 50 can be a conveyor belt, a roller or other types of devices, and the feeding device 50 can be used to transfer the electrode assembly 200 from one position to another, specifically to transfer the electrode assembly 200 to a position close to the winding needle 20 so that the electrode assembly 200 can be wound on the winding needle 20.

[0093] In this way, the feeding device 50 can transfer the electrode assembly 200 located outside the rotating member 10 to the winding needle 20 located at the winding station 110 for winding.

[0094] See also Figure 1 In some embodiments, the feeding device 50 includes a limiting mechanism 51 , which is used to limit the position of the rolling end 202 of the electrode assembly 200 .

[0095] The limiting mechanism 51 may be a mechanism such as a clamp or a guide mechanism that is in direct contact with the electrode assembly 200, or a mechanism that adopts the negative pressure adsorption principle and is not in direct contact with the electrode assembly 200. The limiting mechanism 51 may limit the movement angle and movement path of the electrode assembly 200 so that the electrode assembly 200 can be wound on the winding needle 20 at a correct angle and correct path.

[0096] In this way, the limiting mechanism 51 can limit the position of the electrode assembly 200, thereby reducing the probability of the rolling end 202 of the electrode assembly 200 swinging or deviating. This can improve the stability of the electrode assembly 200 when entering the winding needle 20, reduce the probability of the rolling end 202 of the electrode assembly 200 deviating from the correct position, and thus improve the yield of the electrode assembly 200 after winding.

[0097] See also Figure 1 In some embodiments, the limiting mechanism 51 includes a conveyor belt 52, which is used to convey the winding end 202 of the electrode assembly 200 to the winding needle 20. The conveyor belt 52 is provided with adsorption holes, which are used to form negative pressure and adsorb the electrode assembly 200.

[0098] Specifically, the fixing device 30 can be formed with a plurality of adsorption holes, which are used to form negative pressure. The number of adsorption holes can be two, three, four or even more. The number of adsorption holes can be set according to the structure and shape of the electrode assembly 200, so as to avoid damaging the battery electrode while adsorbing the electrode assembly 200.

[0099] A chamber may be formed inside the fixture 30, and the adsorption hole may be an opening of the chamber. The adsorption hole may generate negative pressure by connecting to a vacuum pump or a vacuum system, and the vacuum pump creates a low-pressure area by extracting air in the chamber, so that the electrode assembly 200 is adsorbed on the fixture 30. The adsorption force may be adjusted by the vacuum pump to adapt to electrode assemblies 200 of different structures and shapes.

[0100] In this way, the conveyor belt 52 can make the electrode assembly 200 move along a specific trajectory when entering the winding needle 20, thereby ensuring the conveying efficiency of the electrode assembly 200, and can limit the position of the electrode assembly 200 through multiple adsorption holes, thereby effectively reducing the probability of the electrode assembly 200 swinging or deflecting during the winding process, thereby improving the yield of the electrode assembly 200 after winding.

[0101] See also Figure 1In a specific embodiment, the winding device 100 includes a rotating member 10, a winding needle 20 and a fixing device 30. The winding needle 20 can rotate relative to the rotating member 10, thereby driving the electrode assembly 200 wound on the winding needle 20 to be wound together to form the electrode assembly 200. The rotating member 10 can rotate around its own center to drive the winding needle 20 and the fixing device 30 to rotate, so that the winding needle 20 and the fixing device 30 can move from the winding station 110 to the finishing station 120 with the rotating member 10. When the winding needle 20 switches from the winding station 110 to the finishing station 120, the finishing end 201 of the electrode assembly 200 is fixed by the fixing device 30, which can reduce the probability of the finishing end 201 of the electrode assembly 200 swinging or offsetting, and reduce the probability of the finishing end 201 of the electrode assembly 200 deviating from the correct position, thereby improving the yield of the electrode assembly 200 after winding.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A winding device, characterized in that: include: A rotating member, wherein the rotating member can rotate along a first direction; A winding needle, the winding needle is rotatably arranged on the rotating member, and the winding needle can rotate with the rotating member to switch from the winding station to the finishing station; A fixing device is arranged on the rotating member and is located on a radial side of the winding needle. The fixing device is used to fix the finishing end of the electrode assembly when the winding needle switches from the winding station to the finishing station.

2. The winding device according to claim 1, characterized in that The fixing device fixes the tail end of the electrode assembly by vacuum adsorption.

3. The winding device according to claim 1, characterized in that The fixing device is located on a side of the winding needle facing a second direction, and the second direction is opposite to the first direction.

4. The winding device according to claim 1, characterized in that When the winding needle is at the winding station, the winding needle fixes the winding end of the electrode assembly by vacuum adsorption.

5. The winding device according to claim 4, characterized in that The winding device includes an auxiliary device arranged on the rotating member, the auxiliary device is located on one side of the winding needle in a radial direction, and when the winding needle is in the winding station, the auxiliary device fits the winding end of the electrode assembly with the winding needle.

6. The winding device according to claim 5, characterized in that The auxiliary device includes a fixed part and a movable part that moves relative to the fixed part, the fixed part is installed on the rotating member, and the movable part is used to drive the rolling end of the electrode assembly to fit with the rolling needle during the movement relative to the fixed part.

7. The winding device according to claim 6, characterized in that The fixing portion is movable relative to the rotating member to correct the position of the rolling end portion of the electrode assembly in the process of driving the rolling end portion of the electrode assembly to move toward the rolling needle.

8. The winding device according to claim 5, characterized in that The auxiliary device blows air toward the winding needle to blow the electrode assembly toward the winding needle.

9. The winding device according to claim 5, characterized in that When the winding needle is at the finishing position, the auxiliary device is used to apply a force to the finishing end of the electrode assembly to maintain the winding trend.

10. The winding device according to claim 5, characterized in that The winding needles, the fixing devices and the auxiliary devices are all multiple in number and are arranged one by one. The multiple winding needles, the multiple fixing devices and the multiple auxiliary devices are arranged at intervals along the rotation direction of the rotating member.

11. The winding device according to claim 1, characterized in that The winding device comprises a feeding device arranged at one side of the rotating member, and the feeding device is used to transport the electrode assembly to the winding needle at the winding station.

12. The winding device according to claim 11, characterized in that The feeding device comprises a limiting mechanism, and the limiting mechanism is used to limit the position of the rolling end of the electrode assembly.

13. The winding device according to claim 12, characterized in that The limiting mechanism comprises a conveyor belt, which is used to convey the winding end of the electrode assembly to the winding needle. The conveyor belt is provided with adsorption holes, which are used to form negative pressure and adsorb the electrode assembly.

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