Winding needle assembly and winding machine

Abstract

The utility model relates to the technical field of battery manufacturing, and provides a winding needle assembly and a winding machine. The winding needle assembly comprises a winding needle and a friction layer, the winding needle comprises a supporting plate and a winding head, the supporting plate has the length direction, the width direction and the thickness direction, the thickness of the winding head is smaller than that of the supporting plate, the winding head is connected to one end of the supporting plate in the width direction, and the friction layer is arranged on the winding head. The friction layer wraps the end, away from the supporting plate, of the winding head in the width direction. The winding needle assembly rotates in the length direction, so that the diaphragm is wound around the winding needle in the length direction; after the diaphragms are wound, the wound diaphragms and the unwound diaphragms are separated through thermal cutting; the friction layer increases the friction force between the diaphragm and the winding head, improves the attaching degree of the wound diaphragm, the winding head and the winding needle, is beneficial to preventing the diaphragm from sliding, falling off or loosening in the winding process by improving the friction force, the wound diaphragm is compact and small in size, and then the tail end of the diaphragm can be welded to the outer surface of the diaphragm.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a winding needle assembly and a winding machine. Background Art

[0002] In battery manufacturing, the core is the core of the lithium battery. It is made by stacking the positive electrode sheet, the negative electrode sheet and the separator crosswise and then winding them. The separator is placed between the positive electrode sheet and the negative electrode sheet, so that the separator can separate the positive electrode sheet from the negative electrode sheet, thereby preventing the positive electrode sheet and the negative electrode sheet from contacting and causing a short circuit. The winding of the battery cell is usually completed by a winding machine, which can stack the positive and negative electrode sheets and the separator in order and wind them to form a battery cell.

[0003] Before winding to form a battery cell, the separator needs to be wound on a winding needle. However, the existing separator is easy to fall off on the winding needle, making it difficult to complete the winding or the winding efficiency is low. Utility Model Content

[0004] The utility model aims to provide a winding needle assembly and a winding machine, aiming to solve the technical problem that the existing diaphragm is easy to fall off from the winding needle during winding.

[0005] In the first aspect, the present application provides a winding needle assembly, which includes a winding needle and a friction layer, the winding needle includes a support plate and a winding head, the support plate has a length direction, a width direction and a thickness direction, the thickness of the winding head is less than the thickness of the support plate, the winding head is connected to one end of the support plate in the width direction, the friction layer is arranged on the winding head, and the friction layer wraps the end of the winding head away from the support plate in the width direction.

[0006] In one embodiment, the friction layer is a Teflon layer, a polypropylene layer or a thermoplastic polyester layer.

[0007] In one embodiment, the friction layer is bonded, sprayed, hot-melted, or electroplated to the winding head.

[0008] In one embodiment, the friction layer has a thickness of 10 μm to 80 μm.

[0009] In one embodiment, the friction layer covers 1 / 3 to 2 / 3 of the width of the winding head.

[0010] In one of the embodiments, the thickness of the winding head gradually decreases in the width direction away from the support plate.

[0011] In one of the embodiments, the thickness of the support plate remains constant in the width direction.

[0012] In one embodiment, the winding needle assembly also includes a mounting seat, and one end of the support plate away from the winding head is mounted on the mounting seat. The number of the winding needles is two, and the two winding needles are located on opposite sides of the mounting seat in the width direction. The two winding needles are spaced apart along the thickness direction.

[0013] In one of the embodiments, the support plate has a plug-in portion at one end away from the winding head, the mounting seat has a socket, and the plug-in portion is plugged and fixed in the socket; there are multiple plug-in portions, and the multiple plug-in portions are spaced apart along the length direction.

[0014] In one embodiment, the support plate is detachably mounted on the mounting base.

[0015] In one of the embodiments, the distance that the mounting seat protrudes from the winding needle on either side in the thickness direction is less than the thickness of the support plate.

[0016] In the second aspect, the present application provides a winding machine, which includes a hot cutter assembly and a winding needle assembly as described above, wherein the hot cutter assembly is arranged adjacent to the winding needle assembly so that the diaphragm passes through the hot cutter assembly and the winding needle assembly in sequence, and the winding needle assembly can be rotatably arranged so that the diaphragm is wound around the winding needle assembly, and the hot cutter assembly is used to cut the diaphragm, form and heat the end of the diaphragm, so that the end of the diaphragm is melted to the diaphragm roll on the winding needle assembly.

[0017] The beneficial effects of the winding needle assembly and the winding machine provided by the utility model are as follows: the winding needle assembly rotates in the length direction so that the diaphragm is wound around the winding needle arrangement in the length direction; when the diaphragm is wound, the wound diaphragm and the unwound diaphragm are separated by thermal cutting; the friction layer increases the friction between the diaphragm and the winding head, and improves the fit between the wound diaphragm and the winding head and the winding needle, and by increasing the friction, it helps to prevent the diaphragm from sliding, falling off or loosening during the winding process. The wound diaphragm is compact and small in size, and the end of the diaphragm can be welded to the outer surface of the diaphragm, which solves the technical problem that the existing diaphragm is easy to fall off from the winding needle during winding, thereby improving the stability of the diaphragm being welded to the outside of the winding head after winding, and avoiding the diaphragm wound on the winding needle assembly from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of the structure of a needle winding assembly provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of the winding needle and the friction layer of the winding needle assembly provided in this embodiment;

[0021] Figure 3 A schematic structural diagram of a winding machine provided in an embodiment of the utility model.

[0022] Among them, the reference numerals in the figure are:

[0023] X, length direction; Y, width direction; Z, thickness direction;

[0024] 10. Diaphragm;

[0025] 100, winding needle assembly; 110, winding needle; 111, support plate; 112, winding head; 113, plug-in portion; 120, friction layer; 130, mounting seat; 131, plug hole;

[0026] 200, hot cutter assembly; 210, hot cutter body; 220, cutter pad;

[0027] 300. Needle winding auxiliary mechanism. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 present invention can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] Combination Figure 1 and Figure 2 The present application provides a winding needle assembly 100. The winding needle assembly 100 includes a winding needle 110 and a friction layer 120. The winding needle 110 includes a support plate 111 and a winding head 112. The support plate 111 has a length direction X, a width direction Y, and a thickness direction Z. The thickness of the winding head 112 is less than the thickness of the support plate 111. The winding head 112 is connected to one end of the support plate 111 in the width direction Y. The friction layer 120 is disposed on the winding head 112. The friction layer 120 wraps one end of the winding head 112 away from the support plate 111 in the width direction Y.

[0035] Among them, the thickness of the winding head 112 is less than the thickness of the support plate 111. On the one hand, it can reduce the overall weight of the winding needle assembly 100 and facilitate the rotation of the winding needle assembly 100; on the other hand, it is convenient for the winding head 112 to form a chamfer, which is beneficial for the diaphragm 10 to be wound at the winding head 112 and change its stacking direction.

[0036] When in use, the winding needle assembly 100 rotates around the length direction X so that the diaphragm 10 is wound around the winding needle 110 in the length direction X. When the diaphragm 10 is wound, the wound diaphragm 10 and the unwound diaphragm 10 are separated by thermal cutting. The friction layer 120 increases the friction between the diaphragm 10 and the winding head 112, and improves the degree of fit between the wound diaphragm 10 and the winding head 112 and the winding needle 110. By increasing the friction, it helps to prevent the diaphragm 10 from sliding, falling off or loosening during the winding process. The wound diaphragm 10 is compact and small in size, and the end of the diaphragm 10 can be welded to the outer surface of the diaphragm 10, thereby improving the stability of the diaphragm 10 after winding. Welding to the outside of the winding head 112 prevents the diaphragm 10 wound on the winding needle assembly 100 from loosening.

[0037] Specifically, the winding machine is a key device for winding the cut positive electrode sheet, negative electrode sheet and separator 10 into a battery cell, and the main operation process includes pre-winding, sheet feeding, winding, separator fusing, transposition, tape application, unloading, etc. The winding needle assembly 100 provided in the present application can be used in the pre-winding and winding operation process, so that the end of the wound separator 10 or the end of the battery cell is frictionally attached to the winding head 112, and then welded and fixed.

[0038] In the present application, the diaphragm 10 can be selected from polyethylene film, polypropylene film, single-sided polypropylene ceramic composite film, single-sided coated polyvinylidene fluoride ceramic composite film, or double-sided gel film. After the diaphragm 10 is wound, the base film surface needs to be welded before welding.

[0039] If it is a single-sided film, such as a single-sided polypropylene ceramic composite film or a single-sided coated polyvinylidene fluoride ceramic composite film, after winding is completed and assembled into a battery cell, the battery cell sometimes deforms due to poor single-sided bonding effect. Therefore, the double-sided gel film is used more and more widely. During the hot melting process of the double-sided gel film, the hot cutter will appear in the process of melting the diaphragm 10 due to the small surface tension of the winding needle 110 and the excessive torque of the winding needle 110 when turning over, which causes the diaphragm 10 to be unable to be welded at the corner of the winding needle 110. However, by using the winding needle assembly 100 provided by the present application, the double-sided gel film can be adsorbed at the corner of the winding needle 110 by friction due to the presence of the friction layer 120 after winding, thereby facilitating the double-sided gel film to weld the outer surface of the diaphragm 10 or the battery cell at the corner of the winding needle 110, so that the surface of the diaphragm 10 or the battery cell is flat and not easy to loosen. At the same time, the double-sided gel film can increase the application scenarios by using the above-mentioned winding needle assembly 100, and improve the winding production efficiency of the winding machine. The double-sided gel film uses double-sided gel, which, on the one hand, improves the flatness of the battery cell, prevents the battery cell from deformation, and improves the appearance yield of the battery cell; on the other hand, it increases the battery liquid retention coefficient and can improve the battery cell cycle performance.

[0040] In some embodiments, in combination Figure 2 The friction layer 120 is a Teflon layer, a polypropylene layer or a thermoplastic polyester layer. Materials such as Teflon, polypropylene and thermoplastic polyester all have a high surface friction coefficient. Using these materials as the friction layer 120 can increase the contact friction between the diaphragm 10 and the winding head 112 and the winding needle 110, which helps to maintain the stability of the diaphragm 10 on the winding needle 110. The friction layer 120 can increase the fit between the end of the diaphragm 10 and the winding head 112 and the winding needle 110, and by increasing the friction, it helps to prevent the diaphragm 10 from sliding, falling off or loosening during the winding process, thereby improving the winding compactness of the diaphragm 10.

[0041] Among them, the Teflon layer has high wear resistance and corrosion resistance, which can effectively protect the surface of the winding head 112 from erosion and wear by the external environment, and extend the service life of the winding needle 110. The polypropylene layer has a high surface energy, which can make the surface of the winding needle 110 more adhesive, which helps the diaphragm 10 to adhere more closely to the surface of the winding needle 110 during the winding process, and improve the stability and firmness of the winding. The thermoplastic polyester layer has a high surface energy, which can make the surface of the winding needle 110 more easily adhere to the diaphragm 10 or other materials, increase the surface tension, and help keep the diaphragm 10 stably fixed on the winding needle 110 during the winding process. The thermoplastic polyester layer has good surface flatness, which can make the surface of the winding needle 110 smoother and improve the flatness of the battery cell.

[0042] In some embodiments, in combination Figure 2 The friction layer 120 is bonded, sprayed, hot-melted, or electroplated on the winding head 112 to improve the stability of the friction layer 120 on the winding head 112.

[0043] For example, the friction layer 120 is set on a part of the surface of the winding needle 110 by selective electroplating, so that the thickness of the friction layer 120 can be accurately controlled, and the thickness can be controlled to the micron level, reducing the use of metal materials; at the same time, electroplating can manufacture friction layers 120 of different shapes and thicknesses, with high flexibility.

[0044] For example, the friction layer 120 is processed and manufactured to a qualified level and then bonded or hot-melted to the surface of the winding head 112, so as to avoid dimensional errors caused by direct electroplating, spraying, additive manufacturing or physical vapor deposition of the friction layer 120 on the winding needle 110, which may fail to meet the precision requirements and cause the entire winding needle 110 to be scrapped, thereby reducing the defective rate and thus reducing production costs.

[0045] For another example, the friction layer 120 is sprayed on a portion of the surface of the winding needle 110. The spraying can control the nozzle position, spray direction and spray angle through a program. The friction layer 120 can be flexibly designed and easily modified and customized to meet specific design requirements. There is no need for additional machining and cutting to obtain a specific shape of the friction layer 120. The same equipment can be used to manufacture friction layers 120 of different shapes, sizes and thicknesses, thereby reducing the types and quantity of processing equipment and reducing production costs.

[0046] In some embodiments, the friction layer 120 is a friction tape, which is bonded to the winding head 112. Compared with other methods for preparing the friction layer 120, such as electroplating, hot melting, etc., the friction tape can reduce the preparation cost, and does not require additional equipment or processes, and can be directly assembled on the surface of the winding head 112, thereby improving assembly efficiency. In addition, the friction tape is easy to cut, and can be cut into different shapes according to the size of the winding head 112, and has strong versatility.

[0047] In some embodiments, in combination Figure 2 , the thickness of the friction layer 120 is 10μm to 80μm. The appropriate thickness of the friction layer 120 can balance the relationship between the friction force and the volume of the battery cell. If the thickness of the friction layer 120 is less than 10μm, the friction force between the friction layer 120 and the diaphragm 10 is not large enough, and the surface of the diaphragm 10 has a tiny concave-convex structure. The too thin friction layer 120 cannot be completely embedded in the concave-convex structure, and the bonding depth is insufficient, which is not conducive to increasing the friction force between the friction layer 120 and the diaphragm 10. If the thickness of the friction layer 120 is greater than 80μm, the thickness and volume of the winding needle assembly 100 will be increased, and the overall size and weight of the battery cell after winding will be increased, and the battery cell will not be compact enough.

[0048] Optionally, the friction layer 120 has a thickness of 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm or 80 μm.

[0049] In some embodiments, in combination Figure 2 , the friction layer 120 covers 1 / 3 to 2 / 3 of the width of the winding head 112, that is, 1 / 3*a≤b≤2 / 3*a. The friction layer 120 with an appropriate width can provide sufficient friction without excessively increasing the volume of the battery cell. If the width b of the friction layer 120 is less than 1 / 3 of the width a of the winding head 112, the friction contact area between the friction layer 120 and the diaphragm 10 is not large enough, which is not conducive to increasing the friction between the friction layer 120 and the diaphragm 10. If the width b of the friction layer 120 is greater than 2 / 3 of the width a of the winding head 112, the thickness and volume of the winding needle assembly 100 will be increased, and the overall size and weight of the battery cell after winding will increase, and the battery cell will not be compact enough.

[0050] Optionally, the friction layer 120 covers 1 / 3, 1 / 2 or 2 / 3 of the width of the winding head 112 .

[0051] In some embodiments, in combination Figure 1 The thickness of the winding head 112 gradually decreases along the direction away from the support plate 111 in the width direction Y. On the one hand, the thickness of the winding head 112 gradually decreases, reducing the stress concentration problem caused by the sudden change in thickness, and improving the structural strength and stability of the winding needle 110; on the other hand, the end of the winding head 112 has the smallest thickness and the smallest R angle, which is conducive to the bending of the diaphragm 10 at the minimum angle at the end of the winding head 112, reducing bending rebound, and thereby improving the adhesion of the diaphragm 10 to the friction layer 120 at the end of the winding head 112.

[0052] In some embodiments, in combination Figure 1, the thickness of the support plate 111 remains unchanged in the width direction Y, and the support plate 111 can provide a stable support force, further improving the wound diaphragm 10 and the battery cell from deformation or deformation during use, and maintaining the stability and reliability of the structure. In addition, the thickness of the support plate 111 remains unchanged to maintain the uniformity and stability of the wound diaphragm 10 and the battery cell.

[0053] In some embodiments, the support plate 111 and the winding head 112 are integrally formed, and there is no need to perform assembly operations between the support plate 111 and the winding head 112. The connection reliability is high, there is no assembly error, and the assembly consistency is high. The winding head 112 does not need to be installed on the support plate 111 using additional fasteners, which reduces the types and quantities of materials such as fasteners and avoids deformation of the wound diaphragm 10 or battery cell due to the addition of fasteners.

[0054] In some embodiments, in combination Figure 1 The winding needle assembly 100 further includes a mounting seat 130, and one end of the support plate 111 away from the winding head 112 is mounted on the mounting seat 130. There are two winding needles 110, which are located on opposite sides of the mounting seat 130 in the width direction Y. The two winding needles 110 are spaced apart along the thickness direction Z. The winding heads 112 are provided at both ends of the winding needle assembly 100 in the width direction Y, which facilitates the diaphragm 10 to turn and bend at the winding heads 112 and reduces the resistance of the turn.

[0055] In addition, the mounting seat 130 can be used to mount the rotating shaft, so as to facilitate the rotation of the winding needle assembly 100.

[0056] In some embodiments, in combination Figure 1 and Figure 2 The end of the support plate 111 away from the winding head 112 has a plug-in portion 113, and the mounting seat 130 has a socket 131. The plug-in portion 113 is plugged and fixed to the socket 131, which can improve the connection stability between the support plate 111 and the mounting seat 130. The support plate 111 is assembled to the mounting seat 130 by plugging without additional assembly tools, which can make the assembly process simpler and more efficient. The plug-in portion 113 is fixed to the socket 131, with high positioning accuracy, large bonding area, and 360° circumferential limit, which can effectively reduce the risk of loosening of the support plate 111 due to vibration or external impact.

[0057] In one embodiment, there are multiple plug-in parts 113, and the multiple plug-in parts 113 are spaced apart along the length direction X. The multiple plug-in parts 113 and the corresponding multiple plug holes 131 are spaced apart along the length direction X, which reduces the excessive stress on a single connection point and improves the connection stability and reliability between the support plate 111 and the mounting column. The design of multiple plug-in parts 113 can increase the connection strength between the support plate 111 and the mounting seat 130, and can withstand greater tension and shear force, especially during the winding and rotation process, to ensure the stability of the diaphragm 10 and the battery cell wound on the winding needle assembly 100 without deformation, thereby improving the resistance of the diaphragm 10 and the battery cell.

[0058] In one embodiment, the support plate 111 is detachably mounted on the mounting base 130, making maintenance easier. At the same time, according to specific needs, the support plate 111 of different materials, shapes and sizes can be selected to meet different functional and application requirements.

[0059] In one embodiment, in combination Figure 1 The distance c that the mounting seat 130 protrudes from the winding needle 110 on either side in the thickness direction Z is less than the thickness of the support plate 111, thereby reducing the protrusions on the surface of the diaphragm 10 and the battery cell wound on the mounting seat 130 and the winding needle 110, and improving the flatness of the diaphragm 10 and the battery cell after winding.

[0060] Embodiment 2

[0061] Combination Figure 3 The present application provides a winding machine. The winding machine includes a hot cutter assembly 200 and a winding needle assembly 100 in the first embodiment. The hot cutter assembly 200 is arranged adjacent to the winding needle assembly 100 so that the diaphragm 10 passes through the hot cutter assembly 200 and the winding needle assembly 100 in sequence. The winding needle assembly 100 can be rotatably arranged so that the diaphragm 10 is wound around the winding needle assembly 100. The hot cutter assembly 200 is used to cut the diaphragm 10, form and heat the end of the diaphragm 10, so that the end of the diaphragm 10 is fused to the diaphragm roll on the winding needle assembly 100.

[0062] When in use, the diaphragm 10 passes through the hot cutter assembly 200 and the winding needle assembly 100 in sequence, and the winding needle assembly 100 rotates around the length direction X, so that the diaphragm 10 is wound around the winding needle 110 in the length direction X. When the diaphragm 10 is wound, the hot cutter assembly 200 thermally cuts and separates the wound diaphragm 10 from the unwound diaphragm 10. The friction layer 120 increases the friction between the diaphragm 10 and the winding head 112, and improves the degree of fit between the wound diaphragm 10 and the winding head 112 and the winding needle 110. By increasing the friction, it helps to prevent the diaphragm 10 from sliding, falling off or loosening during the winding process. The wound diaphragm 10 is compact and small in size, and the end of the diaphragm 10 can be welded to the outer surface of the diaphragm 10, thereby improving the stability of the diaphragm 10 after winding. Welding to the outside of the winding head 112 prevents the diaphragm 10 wound on the winding needle assembly 100 from loosening.

[0063] In one embodiment, the hot cutter assembly 200 includes a hot cutter body 210 and a knife pad 220, and the diaphragm 10 is disposed between the cutter body and the knife pad 220. The hot cutter body 210 can move toward or away from the knife pad 220. The hot cutter body 210 moves toward the knife pad 220 to thermally cut the diaphragm 10.

[0064] In one embodiment, the winding machine further includes a needle winding auxiliary mechanism 300. The needle winding auxiliary mechanism 300 is located on the side of the hot cutter assembly 200 away from the needle winding assembly 100, and another diaphragm 10 passes through the needle winding auxiliary mechanism 300, the hot cutter assembly 200 and the needle winding assembly 100 in sequence, so that the two diaphragms 10 are synchronously wound on the needle winding assembly 100.

[0065] Specifically, the structure of the needle winding auxiliary mechanism 300 is the same as that of the needle winding assembly 100 .

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A needle winding assembly, characterized in that: The winding needle assembly includes a winding needle and a friction layer. The winding needle includes a support plate and a winding head. The support plate has a length direction, a width direction and a thickness direction. The thickness of the winding head is less than the thickness of the support plate. The winding head is connected to one end of the support plate in the width direction. The friction layer is arranged on the winding head. The friction layer wraps the end of the winding head away from the support plate in the width direction.

2. The needle winding assembly according to claim 1, characterized in that: The friction layer is a Teflon layer, a polypropylene layer or a thermoplastic polyester layer.

3. The needle winding assembly according to claim 1, characterized in that: The friction layer is bonded, sprayed, hot-melted, or electroplated on the winding head.

4. The needle winding assembly according to claim 1, characterized in that: The friction layer has a thickness of 10 μm to 80 μm; and / or the friction layer covers 1 / 3 to 2 / 3 of the width of the winding head.

5. The needle winding assembly according to claim 1, characterized in that: The thickness of the winding head gradually decreases in the direction away from the support plate in the width direction; and / or the thickness of the support plate remains unchanged in the width direction.

6. The needle winding assembly according to any one of claims 1 to 5, characterized in that: The winding needle assembly also includes a mounting seat, and one end of the support plate away from the winding head is mounted on the mounting seat. The number of the winding needles is two, and the two winding needles are located on opposite sides of the mounting seat in the width direction. The two winding needles are spaced apart along the thickness direction.

7. The needle winding assembly according to claim 6, characterized in that: The support plate has a plug-in portion at one end away from the winding head, the mounting seat has a plug hole, and the plug-in portion is plugged and fixed in the plug hole; there are multiple plug-in portions, and the multiple plug-in portions are spaced apart along the length direction.

8. The needle winding assembly according to claim 6, characterized in that: The support plate is detachably mounted on the mounting seat.

9. The needle winding assembly according to claim 6, characterized in that: The distance that the mounting seat protrudes from the winding needle on any side in the thickness direction is less than the thickness of the support plate.

10. A winding machine, characterized in that: The winding machine includes a hot cutter assembly and a winding needle assembly according to any one of claims 1 to 9, the hot cutter assembly is arranged adjacent to the winding needle assembly so that the diaphragm passes through the hot cutter assembly and the winding needle assembly in sequence, the winding needle assembly can be rotatably arranged so that the diaphragm is wound around the winding needle assembly, the hot cutter assembly is used to cut the diaphragm, form and heat the end of the diaphragm, so that the end of the diaphragm is welded to the diaphragm roll on the winding needle assembly.

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