Needle winding structure and winding equipment

Abstract

This application provides a winding needle structure and winding equipment for winding stacked diaphragms and electrodes into an electrode assembly. The winding needle structure includes a winding body having a negative pressure cavity and an outer peripheral surface. Along the circumference of the winding body, a starting area and at least one adsorption area are distributed on the outer peripheral surface. The starting area has multiple first adsorption holes communicating with the negative pressure cavity. Adsorption forces are generated at the first adsorption holes, which can adsorb the starting position of the diaphragm into the starting area. The starting area is only used to adsorb the starting position of the diaphragm. The adsorption area has multiple second adsorption holes communicating with the negative pressure cavity. Adsorption forces are generated at the second adsorption holes, which can adsorb at least one of the diaphragm and the stacked layers into the adsorption area. The sum of the adsorption forces at all the first adsorption holes in the starting area is greater than the sum of the adsorption forces at all the second adsorption holes in the adsorption area. This application can allocate a larger adsorption force to the starting position of the diaphragm to improve the problem of slippage and wrinkling of the diaphragm during electrode assembly fabrication.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a winding needle structure and winding equipment. Background Technology

[0002] In battery manufacturing, the winding of electrode assemblies is a crucial process. Currently, commonly used winding equipment can stack positive electrode sheets, negative electrode sheets, and two layers of separators in a specific order and then wind them to form electrode assemblies. However, problems such as separator slippage and wrinkling can easily occur during the winding process. These problems not only affect the appearance of the electrode assembly but can also lead to internal short circuits in severe cases, thereby affecting the overall performance and reliability of the battery.

[0003] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0004] In view of the above problems, embodiments of this application provide a winding needle structure and winding equipment, which can improve the problem of diaphragm slipping and wrinkling during the electrode assembly manufacturing process.

[0005] In a first aspect, embodiments of this application provide a winding needle structure for winding stacked diaphragms and electrode sheets into an electrode assembly, the winding needle structure comprising:

[0006] The wound body has a negative pressure cavity and an outer peripheral surface;

[0007] Along the circumference of the wound body, a winding zone and at least one adsorption zone are distributed on the outer circumferential surface;

[0008] Multiple first adsorption holes are provided in the winding zone. The multiple first adsorption holes are connected to the negative pressure chamber, so that adsorption force can be generated at the multiple first adsorption holes, and the winding position of the diaphragm can be adsorbed in the winding zone. The winding zone is only used to adsorb the winding position of the diaphragm.

[0009] Multiple second adsorption pores are provided in the adsorption zone. The multiple second adsorption pores are connected to the negative pressure chamber, so that adsorption force can be generated at the multiple second adsorption pores, and at least one of the diaphragm and the composite layer can be adsorbed in the adsorption zone. The composite layer is a composite structure of diaphragm and electrode.

[0010] The sum of the adsorption forces of all the first adsorption pores in the starting zone is the total adsorption force of the starting zone, and the sum of the adsorption forces of all the second adsorption pores in the same adsorption zone is the total adsorption force of the adsorption zone. The total adsorption force of the starting zone is greater than the total adsorption force of the adsorption zone.

[0011] In the above technical solution, by providing adsorption holes (including a first adsorption hole and a second adsorption hole) on the outer peripheral surface of the wound body, the negative pressure provided by the negative pressure chamber enables adsorption force to be generated at the adsorption holes, which can adsorb and fix the diaphragm, saving the time of clamping and fixing the diaphragm in the traditional solution and improving production efficiency. Moreover, a winding-up area and an adsorption area are provided on the outer peripheral surface. The winding-up area is used to adsorb the winding-up position of the diaphragm, and the sum of the adsorption forces at the adsorption holes in the winding-up area is greater than the sum of the adsorption forces at the adsorption holes in any adsorption area. This allows for the distribution of a larger adsorption force to the winding-up area, so that the winding-up position of the diaphragm can be stably attached to the winding-up area, thereby improving the problem of diaphragm slippage and wrinkling during the electrode assembly manufacturing process. In addition, compared with the scheme where the adsorption force allocated to the starting zone and each adsorption zone is the same or relatively balanced, this scheme allocates the adsorption force so that the starting zone can receive more adsorption force than other adsorption zones, so as to stabilize the starting position of the membrane and optimize the distribution of adsorption force. At the same time, while achieving the purpose of stabilizing the starting position of the membrane, the above two adsorption force distribution schemes do not require matching each adsorption zone with the same adsorption force as the starting zone, which can make the negative pressure energy consumption of this scheme lower.

[0012] In some embodiments, at least two adsorption regions are distributed on the outer peripheral surface;

[0013] Along the direction opposite to the rotation direction of the winding body and starting from the starting area, the total adsorption force of all adsorption areas shows a decreasing trend.

[0014] In the above technical solution, by setting the total adsorption force in the starting area and each adsorption area to decrease in the opposite direction to the rotation direction of the winding body, the diaphragm can be gradually adsorbed onto the outer peripheral surface of the winding body, and the adsorption force on the diaphragm can be gradually reduced in a stepwise manner. This prevents the diaphragm portion already adsorbed onto the outer peripheral surface from shifting due to excessive subsequent adsorption force, thereby further improving the problem of diaphragm slippage and wrinkling, and improving the quality of the electrode assembly.

[0015] In some embodiments, the sum of the cross-sectional areas of all the first adsorption holes in the winding zone is the first total cross-sectional area, and the sum of the cross-sectional areas of all the second adsorption holes in the same adsorption zone is the second total cross-sectional area, wherein the first total cross-sectional area is greater than the second total cross-sectional area.

[0016] In the above technical solution, by setting the total cross-sectional area of ​​the adsorption holes in the winding zone to be greater than the total cross-sectional area of ​​the adsorption holes in any adsorption zone, the sum of the adsorption forces at the adsorption holes in the winding zone can be greater than the sum of the adsorption forces at the adsorption holes in any adsorption zone. This allows for the distribution of a larger adsorption force to the winding zone, ensuring that the winding position of the diaphragm can stably adhere to the winding zone, thereby improving the problem of slippage and wrinkling of the diaphragm during electrode assembly fabrication. Furthermore, this solution uses the method of changing the total cross-sectional area of ​​the adsorption holes in the winding zone and the adsorption zone to configure different adsorption forces for different areas. Compared to the solution of configuring adsorption force by adjusting negative pressure, this solution can provide a more stable negative pressure output, reduce the difficulty of system control, and has lower negative pressure energy consumption.

[0017] In some embodiments, at least two adsorption regions are distributed on the outer peripheral surface;

[0018] Along the direction opposite to the rotation direction of the winding body and starting from the starting area, all the second total cross-sectional areas show a decreasing trend.

[0019] In the above technical solution, by setting the total cross-sectional area of ​​the adsorption holes in all adsorption zones to show a decreasing trend, the total adsorption force in the starting zone and each adsorption zone can show a decreasing trend in the opposite direction to the rotation direction of the winding body. This allows the diaphragm to be gradually adsorbed onto the outer peripheral surface of the winding body, and the adsorption force on the diaphragm can be gradually reduced in a stepwise manner. This prevents the diaphragm portion already adsorbed on the outer peripheral surface from shifting due to excessive subsequent adsorption force, thereby further improving the problem of diaphragm slippage and wrinkling, and improving the quality of the electrode assembly.

[0020] In some embodiments, the ratio of the sum of the cross-sectional areas of all the first adsorption holes in the winding zone to the area of ​​the winding zone is G, and G satisfies: 0.05≤G≤0.6.

[0021] In the above technical solution, by limiting the total cross-sectional area of ​​the first adsorption holes in the winding zone, the area occupied by the first adsorption holes in the winding zone is made appropriate, which can not only stably adsorb the winding position of the diaphragm, but also provide sufficient support for the winding position of the diaphragm.

[0022] In some embodiments, the cross-sectional area of ​​the first adsorption pore is greater than or equal to 0.19 square millimeters and less than or equal to 20 square millimeters.

[0023] In the above technical solution, by limiting the cross-sectional area of ​​the first adsorption hole, the cross-sectional area of ​​the first adsorption hole is made suitable, which can provide sufficient adsorption force to adsorb and fix the starting position of the diaphragm, and also prevent the starting position of the diaphragm from wrinkling due to being sucked into the first adsorption hole.

[0024] In some embodiments, the ratio of the sum of the cross-sectional areas of all second adsorption pores in the same adsorption region to the area of ​​the adsorption region is H, where H satisfies: 0.02 ≤ H ≤ 0.5.

[0025] In the above technical solution, by limiting the total cross-sectional area of ​​the second adsorption pores in the adsorption zone, the area occupied by the second adsorption pores in the adsorption zone is made appropriate, which can not only stably adsorb at least one of the diaphragm and the laminate, but also provide sufficient support for at least one of the diaphragm and the laminate.

[0026] In some embodiments, the cross-sectional area of ​​the second adsorption pore is greater than or equal to 0.19 square millimeters and less than or equal to 20 square millimeters.

[0027] In the above technical solution, by limiting the cross-sectional area of ​​the second adsorption pore, the cross-sectional area of ​​the second adsorption pore is made suitable, which can provide sufficient adsorption force to adsorb and fix at least one of the diaphragm and the laminated layer, and can also prevent the diaphragm and the laminated layer from wrinkling due to being sucked into the second adsorption pore.

[0028] In some embodiments, the cross-sectional area of ​​the plurality of first adsorption holes in the winding zone tends to decrease in the direction opposite to the rotation direction of the winding body; and / or,

[0029] Along the direction opposite to the rotation direction of the winding body, the cross-sectional area of ​​the plurality of second adsorption pores in at least one adsorption zone tends to decrease.

[0030] In the above technical solution, by setting the cross-sectional area of ​​the first adsorption hole in the winding zone to decrease and the cross-sectional area of ​​the multiple second adsorption holes in the adsorption zone to decrease, the adsorption force in the winding zone and the adsorption zone can decrease in the opposite direction to the rotation direction of the winding body. In this way, the winding position of the diaphragm and at least one of the diaphragm and the laminated layer can be gradually adsorbed on the corresponding area. In this process, the adsorption force used to adsorb the diaphragm can be gradually reduced in a stepwise manner, so that the diaphragm part already adsorbed on the corresponding area will not be displaced due to the subsequent excessive adsorption force. This can further improve the problem of the diaphragm being prone to slippage and wrinkling, and improve the quality of the electrode assembly.

[0031] In some embodiments, the negative pressure chamber is provided with a connection end communicating with a vacuum device on one side of the winding body along the axial direction;

[0032] Along the axial direction of the winding body, the cross-sectional area of ​​the multiple first adsorption holes in the winding zone shows an increasing trend, and along the axial direction of the winding body, the cross-sectional area of ​​the first adsorption hole near the connecting end is smaller than the cross-sectional area of ​​the first adsorption hole away from the connecting end; and / or,

[0033] Along the axial direction of the winding body, the cross-sectional area of ​​the plurality of second adsorption holes in at least one adsorption zone tends to increase, and along the axial direction of the winding body, the cross-sectional area of ​​the second adsorption hole near the connection end is smaller than the cross-sectional area of ​​the second adsorption hole away from the connection end.

[0034] In the above technical solution, by setting the cross-sectional area of ​​the adsorption holes in the starting area and adsorption area to increase from the connecting end along the axial direction of the winding body, the adsorption force of multiple adsorption holes distributed along the axial direction of the winding body can be made consistent in the early stage of providing negative pressure, so as to synchronously and stably adsorb and fix the diaphragm in the axial direction of the winding body.

[0035] In some embodiments, any two adjacent first adsorption holes are staggered in the circumferential direction of the wound body; and / or,

[0036] Any two adjacent second adsorption holes are staggered in the circumferential direction of the wound body.

[0037] In the above technical solution, the staggered design of any two adjacent first adsorption holes and / or any two adjacent second adsorption holes in the circumferential direction of the winding body can make the adsorption holes in the winding area and / or adsorption area more densely distributed, which is beneficial to further improve the stability of the diaphragm after it is adsorbed and fixed.

[0038] In some embodiments, the outer peripheral edge of the starting area includes a first edge, a second edge, and two starting side edges;

[0039] The first edge and the second edge are arranged opposite each other along the circumferential direction of the winding body, and the first edge is closer to the starting end of the diaphragm adsorbed in the starting area than the second edge;

[0040] The two starting edges are arranged opposite each other along the axial direction of the winding body, and the two starting edges are respectively connected between the first edge and the second edge;

[0041] At least a portion of the first adsorption holes are strip-shaped holes, and at least a portion of the strip-shaped holes are distributed on the first edge and the two roll-up side edges.

[0042] In the above technical solution, by arranging strip holes at the first edge and two side edges of the starting area, and generating an adsorption force distributed along its length at the strip holes, the edge area of ​​the starting position of the diaphragm can be adsorbed over a larger area, so that the edge area of ​​the starting position of the diaphragm can be more stably adsorbed on the starting area.

[0043] In some embodiments, the length extension direction of the strip-shaped holes distributed at the first edge is not consistent with the circumferential direction of the wound body; and / or,

[0044] The length extension direction of the strip holes distributed on the two starting edge sides is not consistent with the axial direction of the winding body.

[0045] In the above technical solution, by setting the length extension direction of the strip holes distributed on the first edge to be inconsistent with the circumferential direction of the winding body, and the length extension direction of the strip holes distributed on the two starting edge edges to be inconsistent with the axial direction of the winding body, the contact area between these strip holes and the edge region of the starting position of the diaphragm can be increased, so that the adsorption force at these strip holes can adsorb and fix the edge region of the starting position of the diaphragm more, thereby further enhancing the stability of the edge region of the starting position of the diaphragm being adsorbed on the starting area.

[0046] In some embodiments, the outer peripheral edge of the adsorption region includes two adsorption side edges, which are arranged opposite to each other along the axial direction of the winding body.

[0047] At least a portion of the second adsorption pores are strip-shaped pores, and at least a portion of the strip-shaped pores are distributed on the two adsorption side edges.

[0048] In the above technical solution, by arranging strip-shaped holes on the two adsorption side edges of the adsorption zone, and generating adsorption forces distributed along the length extension direction of the strip-shaped holes, the edge regions of at least one of the diaphragm and the laminated layer can be adsorbed over a larger area, so that the edge regions of at least one of the diaphragm and the laminated layer can be more stably adsorbed on the adsorption zone.

[0049] In some embodiments, the length extension direction of the strip holes distributed on the two adsorption side edges is not consistent with the axial direction of the winding body.

[0050] In the above technical solution, by setting the length extension direction of the strip holes distributed on the two adsorption side edges to be inconsistent with the axial direction of the winding body, the contact area between these strip holes and the edge region of at least one of the diaphragm and the laminated layer can be increased, so that the adsorption force at these strip holes can adsorb and fix more of the edge region of at least one of the diaphragm and the laminated layer, thereby further enhancing the stability of the edge region of at least one of the diaphragm and the laminated layer being adsorbed on the adsorption area.

[0051] In some embodiments, the central angle subtended by the starting zone is α, and the central angle subtended by the adsorption zone is β, wherein α and β satisfy: 1.2≤α / β≤1.5.

[0052] In the above technical solution, by limiting the ratio of the central angle opposite to the starting area to the central angle opposite to the adsorption area, the starting area and the adsorption area can be reasonably distributed on the outer circumference of the winding body, so that both the starting area and the adsorption area have suitable areas to meet the needs of winding different types of electrode components, and so that the diaphragm of each electrode component can be effectively and stably adsorbed and fixed.

[0053] In some embodiments, the central angle subtended by the starting area is α, where α satisfies: 30°≤α≤160°.

[0054] In the above technical solution, by limiting the angular range of the central angle opposite the starting area, the starting area can have a suitable area, which can effectively support the starting position of the diaphragm and make the energy consumption of negative pressure more reasonable.

[0055] In some embodiments, the negative pressure chamber satisfies one of the following conditions:

[0056] Each of the winding zone and each adsorption zone is equipped with a negative pressure chamber, and all negative pressure chambers are separated from each other.

[0057] The starting zone and all adsorption zones share a single negative pressure chamber;

[0058] At least two adsorption zones are distributed on the outer peripheral surface, and the starting zone is equipped with an independent negative pressure chamber. At least two of the adsorption zones share a negative pressure chamber.

[0059] There are at least two adsorption zones distributed on the outer peripheral surface, and the starting zone and part of the adsorption zone share a negative pressure chamber.

[0060] In the above technical solution, by setting different negative pressure chamber schemes, negative pressure can be reasonably distributed to the starting area and the adsorption area according to the needs, so that both the starting area and the adsorption area can receive a continuous and stable negative pressure supply.

[0061] In some embodiments, the absolute value of the negative pressure in the negative pressure chamber connected to the first adsorption hole is greater than or equal to the absolute value of the negative pressure in the negative pressure chamber connected to the second adsorption hole.

[0062] In the above technical solution, by setting the absolute value of the negative pressure supplied to the first adsorption hole to be greater than or equal to the absolute value of the negative pressure supplied to the second adsorption hole, a larger adsorption force can be distributed to the winding area, so that the winding position of the diaphragm can be stably attached to the winding area, thereby improving the problem of the diaphragm easily slipping and wrinkling during the electrode assembly manufacturing process.

[0063] In some embodiments, a cutting groove is recessed on the outer peripheral surface, and the cutting groove extends along the axial direction of the winding body;

[0064] The cutting slot is configured to accommodate the cutting element, enabling the cutting element to cut the diaphragm within the cutting slot.

[0065] In the above technical solution, by setting a cutting groove on the outer circumferential surface of the winding body and cooperating with a cutting component, the diaphragm can be cut without stopping the machine, which can greatly improve production efficiency.

[0066] In some embodiments, the outer peripheral edge of the winding zone includes a first edge and a second edge disposed circumferentially opposite to each other along the winding body, wherein the first edge is closer to the winding end of the diaphragm adsorbed in the winding zone than the second edge;

[0067] Along the circumference of the winding body, the cutting groove is located on the side of the starting area near the first edge.

[0068] In the above technical solution, by setting the cutting groove on the side of the starting area close to the first edge, and after cutting the diaphragm between two electrode assemblies, the starting diaphragm of the next electrode assembly can be aligned with the starting area and the next electrode assembly can be started to be wound.

[0069] In some embodiments, the number of cut-off slots is multiple;

[0070] Along the circumference of the wound body, a partial cutting groove is provided on one side of the starting area near the second edge; and / or,

[0071] Partial cut-off slots are located between two adjacent adsorption zones.

[0072] In the above technical solution, by setting the cutting groove on the side of the starting area close to the second edge or between two adjacent adsorption areas, the starting of the next electrode assembly can start from any adsorption area, which can meet the winding requirements of different types of electrode assemblies.

[0073] In some embodiments, the winding body is divided into two half-winding sections, which are arranged in a centrally symmetrical manner about the axis of the winding body.

[0074] There are two cutting slots, which are arranged opposite each other on the two half-wound sections along the radial direction of the winding body.

[0075] In the above technical solution, the design of two cutting slots is adopted, and the two cutting slots are arranged opposite to each other on the two half-winding parts, which helps the winding body maintain dynamic balance when rotating.

[0076] In some embodiments, a slot is recessed on the outer peripheral surface, and the slot extends along the axial direction of the wound body;

[0077] There are two slots, which are arranged opposite each other along the radial direction of the winding body;

[0078] The two slots are configured to allow two clamping pins to be inserted, enabling the two clamping pins to remove the electrode assembly wound on the winding body.

[0079] In the above technical solution, by setting two slots, two clamping pins can be used to facilitate the removal of the electrode assembly from the winding body; in addition, the design of two slots and the arrangement of the two slots opposite each other on the winding body helps the winding body maintain dynamic balance when rotating.

[0080] In some embodiments, the winding body is divided into two half-winding portions, which are arranged centrally symmetrically about the axis of the winding body, and the two half-winding portions can move closer to or further away from each other.

[0081] Two slots are respectively located between the two half-wound sections.

[0082] In the above technical solution, by adjusting the distance between the two semi-wound sections, the space of the slot can be changed to accommodate a wider range of clamping pins. Simultaneously, reducing the machining of the slot on the two semi-wound sections not only facilitates low-cost slot manufacturing but also increases the structural strength of the two semi-wound sections.

[0083] Secondly, embodiments of this application also provide a winding device, including the winding needle structure provided in any of the embodiments of the first aspect.

[0084] In the above technical solution, the winding equipment, by adopting the winding needle structure in the first aspect, can effectively improve the product quality and yield of the electrode assembly, thereby improving the overall performance and reliability of the battery. Attached Figure Description

[0085] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0086] Figure 1 This is a three-dimensional structural schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application, showing a first angle.

[0087] Figure 2 This is a three-dimensional structural diagram of a first type of coiled needle structure provided according to some embodiments of this application, taken from a second angle.

[0088] Figure 3 This is a schematic diagram of the diaphragm cooperating with a first type of winding needle structure when the next electrode assembly is about to be wound up according to some embodiments of this application;

[0089] Figure 4 This is a three-dimensional structural schematic diagram of a second type of coiled needle structure provided according to some embodiments of this application, showing a first angle.

[0090] Figure 5 This is a three-dimensional structural diagram of the first type of needle coil structure provided according to some embodiments of this application from a third angle;

[0091] Figure 6 This is a schematic front view of a first type of needle coil structure provided according to some embodiments of this application;

[0092] Figure 7This is a bottom view schematic diagram of a first type of needle coil structure provided according to some embodiments of this application;

[0093] Figure 8 This is a top view schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application;

[0094] Figure 9 This is a front view schematic diagram of a third type of needle coil structure provided according to some embodiments of this application;

[0095] Figure 10 This is a three-dimensional structural diagram of the fourth type of coiled needle structure provided according to some embodiments of this application, showing a first angle.

[0096] Figure 11 This is a front view schematic diagram of a fifth type of needle coil structure provided according to some embodiments of this application;

[0097] Figure 12 This is a schematic front view of a sixth type of needle coil structure provided according to some embodiments of this application;

[0098] Figure 13 This is a front view schematic diagram of a seventh type of needle coil structure provided according to some embodiments of this application;

[0099] Figure 14 This is a right-side view of a first type of coiled needle structure provided according to some embodiments of this application;

[0100] Figure 15 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 30°;

[0101] Figure 16 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 60°;

[0102] Figure 17 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 160°;

[0103] Figure 18 This is a structural schematic diagram of a first layout of a negative pressure cavity according to some embodiments of this application;

[0104] Figure 19 This is a structural schematic diagram of a second layout of the negative pressure chamber according to some embodiments of this application;

[0105] Figure 20 This is a structural schematic diagram of a third layout of the negative pressure chamber according to some embodiments of this application;

[0106] Figure 21 This is a structural schematic diagram of a fourth layout of the negative pressure chamber according to some embodiments of this application;

[0107] Figure 22 This is a three-dimensional structural schematic diagram of a first-angle coiled needle structure provided according to some embodiments of the present application, wherein a cutting groove structure is shown.

[0108] Figure 23 This is a schematic diagram of the structure for achieving diaphragm cutting by cooperating the winding body and the roller body according to some embodiments of this application;

[0109] Figure 24 This is a structural schematic diagram of a first layout of the cutting slot according to some embodiments of this application;

[0110] Figure 25 This is a structural schematic diagram of a second layout of the cutting slot according to some embodiments of this application;

[0111] Figure 26 This is a structural schematic diagram of a third layout of the cutting slot according to some embodiments of this application;

[0112] Figure 27 This is a schematic diagram of a cut-off groove with an arc-shaped cross-section according to some embodiments of this application;

[0113] Figure 28 This is a schematic diagram of a rectangular cross-sectional shape of a cutting groove according to some embodiments of this application;

[0114] Figure 29 This is a schematic diagram of a V-shaped cross-sectional groove provided according to some embodiments of this application;

[0115] Figure 30 This is a three-dimensional structural schematic diagram of a first-angle coiling structure provided according to some embodiments of the present application, wherein a slot structure is shown;

[0116] Figure 31 This is a right-side view of a first type of coiled needle structure provided according to some embodiments of this application, showing one layout of the slots.

[0117] The attached figures are labeled as follows:

[0118] 1-Wound body;

[0119] 11-Outer peripheral surface; 111-Rolling area, 1111-First row of holes, 11111-First adsorption hole, 1112-First edge, 1113-Second edge, 1114-Rolling side edge, 112-Adsorption area, 1121-Second row of holes, 11211-Second adsorption hole, 1122-Adsorption side edge, 112a-First adsorption area, 112b-Second adsorption area, 113-No adsorption area;

[0120] 12 - Negative pressure chamber, 121 - Connection end;

[0121] 13-Cut-off slot;

[0122] 14-slot;

[0123] 15 - Half-wound section, 151 - Gap;

[0124] 2-Dipole, 21-Starting position, 22-Starting end;

[0125] 3-Electrode;

[0126] 4-Roller body, 41-Cut piece. Detailed Implementation

[0127] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0128] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the embodiments of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0129] The term "embodiment" as used in this application means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0130] The specific term "exemplary" used in the embodiments of this application means "serving as an example, embodiment, or illustration." Any embodiment illustrated as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0131] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0132] In the description of the embodiments in this application, the technical term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0133] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0134] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of the embodiments of this application. They are only used to facilitate the description of the embodiments of this application and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0135] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0136] In the description of the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0137] In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly specified.

[0138] In the description of the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0139] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0140] Electrode assemblies are the core component of batteries. In the production process of wound batteries, winding equipment is used to wind the electrodes and separators to form electrode assemblies. Currently, commonly used winding equipment and methods allow the positive electrode, negative electrode, and two layers of separator to be fed separately and stacked in a certain order before being transported to a winding needle structure for winding. After one electrode assembly is wound, the machine needs to be moved to another station to wind the next electrode assembly. At this time, the tail end of the separator of the previous electrode assembly needs to be cut to complete the previous electrode assembly and allow the next electrode assembly to begin winding. To improve winding efficiency, when the separator is cut, a vacuum adsorption winding needle structure is usually used to adsorb and fix the separator of the next electrode assembly and begin winding. However, the existing vacuum adsorption type winding needle structure is only suitable for adsorbing and winding separators with low tension. It is still difficult to complete the winding process for separators with high tension (such as separators of composite electrodes). As a result, when the next electrode assembly begins to be wound, problems such as separator slippage and wrinkling are likely to occur. These problems not only affect the appearance of the electrode assembly, but in severe cases, they can also cause short circuits inside the electrode assembly, thereby affecting the overall performance and reliability of the battery.

[0141] To address the aforementioned problems, this application provides a needle winding structure comprising a winding body. A starting area and at least one adsorption area are circumferentially arranged on the outer peripheral surface of the winding body. Both the starting area and the adsorption area have adsorption holes for adsorbing the diaphragm. The starting area is used to adsorb the starting position of the diaphragm, and the adsorption force in the starting area is greater than that in any adsorption area. By distributing a larger adsorption force to the starting area, the starting position of the diaphragm can be firmly adsorbed onto the outer peripheral surface of the winding body during the initial stage of electrode assembly winding, thereby improving problems such as diaphragm slippage and wrinkling.

[0142] The needle winding structure provided in this application is suitable for winding equipment and can be used in the winding process of battery manufacturing, specifically for winding electrode assemblies. During battery fabrication, the needle winding structure is used to wind the electrode sheets and separator of the electrode assembly to form the electrode assembly. The winding equipment provided in this application can be used not only in lithium-ion battery production lines but also in sodium-ion battery production lines or production lines for other types of batteries.

[0143] In this embodiment, the electrode assembly can serve as the component where the electrochemical reaction occurs within the battery cell. The battery cell can be a secondary battery, meaning a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, or lead-acid battery; this embodiment is not limited to these types. The battery cell can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0144] The electrode assembly can be a wound structure. The positive electrode sheet, negative electrode sheet and two layers of separator can be fed into the winding equipment separately, stacked in a certain order and then wound to form a wound electrode assembly.

[0145] The electrode assembly can be cylindrical, cuboid, flat, or polygonal.

[0146] The electrode assembly includes a positive electrode, a negative electrode, and a separator. The negative electrode has the opposite polarity to the positive electrode, and the separator is located between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through.

[0147] The positive electrode includes a positive current collector and a positive active material layer, wherein the positive active material layer is disposed on at least one surface of the positive current collector.

[0148] The positive electrode current collector may be made of materials including, but not limited to, aluminum foil and aluminum alloy foil, or composite aluminum foil with a polymer layer. The polymer layer may be made of one or more of polyethylene terephthalate, polyethylene, polypropylene, polyamide, polyimide, polyvinyl chloride, and polystyrene.

[0149] The positive electrode current collector has a flat strip structure, and positive electrode active material layers can be set on both surfaces along the thickness direction of the positive electrode current collector.

[0150] The positive electrode active material layer includes a positive electrode active material, a conductive agent, a binder, and deionized water. These materials are mixed, stirred evenly, and then coated onto the surface of the positive electrode current collector to obtain the positive electrode active material layer. The positive electrode active material can be selected from one or more of lithium nickel cobalt manganese oxide, lithium nickel cobalt manganese oxide, lithium cobalt oxide, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium manganese iron phosphate, and cobalt-free materials.

[0151] The negative electrode sheet includes a negative current collector and a negative active material layer, wherein the negative active material layer is disposed on at least one surface of the negative current collector.

[0152] The negative electrode current collector can be made of copper foil or composite copper foil with a polymer layer. The materials of the negative electrode current collector include, but are not limited to, copper foil, copper alloy foil, nickel foil, titanium foil, nickel foam, and copper foam. The negative electrode current collector has a flat strip structure, and negative electrode active material layers can be set on both surfaces along the thickness direction of the negative electrode current collector.

[0153] The negative electrode active material layer includes a negative electrode active material, a conductive agent, a binder, and deionized water. These materials are mixed, stirred evenly, and then coated onto the surface of the negative electrode current collector to obtain the negative electrode active material layer. The negative electrode active material can be selected from one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microspheres, silicon, silicon oxide, silicon-carbon composites, and silicon alloys.

[0154] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings. The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0155] refer to Figures 1 to 4 , Figure 1 This is a three-dimensional structural schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application, showing a first angle. Figure 2 This is a three-dimensional structural diagram of a first type of coiled needle structure provided according to some embodiments of this application, taken from a second angle. Figure 3 This is a schematic diagram of the diaphragm cooperating with a first type of winding needle structure when the next electrode assembly is about to be wound up according to some embodiments of this application; Figure 4 This is a three-dimensional structural diagram of a second type of needle coiling structure provided according to some embodiments of this application, showing a first angle.

[0156] In a first aspect, embodiments of this application provide a winding needle structure for winding stacked diaphragms 2 and electrode sheets 3 into an electrode assembly. For example... Figure 1 and Figure 2 As shown, the winding needle structure includes a winding body 1, which has a negative pressure cavity 12 and an outer peripheral surface 11. Along the circumference of the winding body 1, a winding starting area 111 and at least one adsorption area 112 are distributed on the outer peripheral surface 11. The winding starting area 111 is provided with a plurality of first adsorption holes 11111, which communicate with the negative pressure cavity 12, enabling adsorption force to be generated at the plurality of first adsorption holes 11111, allowing the winding starting position 21 of the diaphragm 2 to be adsorbed onto the winding starting area 111. The winding starting area 111 is only used to adsorb the winding starting position 21 of the diaphragm 2. The adsorption area 112 is provided with a plurality of... A plurality of second adsorption holes 11211 are connected to a negative pressure chamber 12, so that adsorption force can be generated at the plurality of second adsorption holes 11211, and at least one of the diaphragm 2 and the composite layer can be adsorbed in the adsorption region 112. The composite layer is a composite structure of the diaphragm 2 and the electrode 3. The sum of the adsorption forces of all the first adsorption holes 11111 in the winding region 111 is the total adsorption force of the winding region, and the sum of the adsorption forces of all the second adsorption holes 11211 in the same adsorption region 112 is the total adsorption force of the adsorption region. The total adsorption force of the winding region is greater than the total adsorption force of the adsorption region.

[0157] The winding structure refers to the structure in the winding equipment used to wind the stacked diaphragm 2 and electrode 3 into an electrode assembly. The diaphragm 2 and electrode 3 can be stacked to form a composite sheet before winding. The electrode 3 can be a first electrode and a second electrode with opposite polarities, such as a positive electrode and a negative electrode. The diaphragm 2 can be two layers, and the stacked diaphragm 2 and electrode 3 can be a composite sheet formed by stacking the first electrode, diaphragm, second electrode, and diaphragm again. To enhance the structural stability of the composite sheet, the diaphragm 2 and electrode 3 can be bonded during the stacking process, or other connection methods can be used to achieve a fixed connection between the diaphragm 2 and electrode 3. In the composite sheet, to reliably isolate the two electrode 3s, the size of the diaphragm 2 is generally larger than the size of the electrode 3, allowing the edges of the diaphragm 2 to extend beyond the electrode 3. The extended diaphragm portion can be used for the starting and ending of the electrode assembly.

[0158] It should be noted that, based on the fact that the two ends of the diaphragm 2 in the composite sheet can extend beyond the electrode 3, that is, the diaphragm 2 extending beyond the electrode 3 is provided at both the head and tail of the composite sheet, the composite sheet can be divided into three segments along the winding direction of the composite sheet on the winding body 1, namely the head diaphragm, the laminated layer and the tail diaphragm. The head diaphragm is the portion of the diaphragm located at the head of the composite sheet and extending beyond the electrode 3. The head diaphragm is used for the initial winding of the electrode assembly. That is, during the initial stage of winding the electrode assembly, the head diaphragm first contacts the winding needle structure and can be fixed on the winding body 1 to facilitate the subsequent winding of the electrode assembly. The laminated layer is the laminated structure of the diaphragm 2 and the electrode 3. That is, the laminated layer is the part of the composite sheet where the diaphragm 2 and the electrode 3 are stacked. The diaphragm portion in the laminated layer is connected between the head diaphragm and the tail diaphragm, and the three can be a diaphragm made as a single unit. The tail diaphragm is the portion of the diaphragm located at the tail of the composite sheet and extending beyond the electrode 3. The tail diaphragm is used for the final winding of the electrode assembly. That is, during the final winding stage of the electrode assembly, the tail diaphragm can be wound on the outermost side of the electrode assembly to fix the wound electrode assembly and prevent it from loosening.

[0159] Understandably, during the process of using a needle-wound structure to wind the composite sheet to form an electrode assembly, the head diaphragm is first fixed and wound onto the winding body 1, and subsequently, the laminated layer and the tail diaphragm are wound sequentially to form the electrode assembly. Since the electrode 3 in the laminated layer can be connected to the diaphragm 2 through bonding or other means during the stacking process, the electrode 3 in the laminated layer can be wound together with the diaphragm 2, so that the entire laminated layer can be wound onto the needle-wound structure under the influence of the head diaphragm.

[0160] The winding body 1 is used to wind the flattened composite sheet around its outer peripheral surface 11 to form an electrode assembly. For example... Figure 1 and Figure 2As shown, the winding body 1 can be an axial structure, and it can rotate around its own axis to drive the flattened composite sheet to wind into a wound electrode assembly. The cross-sectional shape of the winding body 1 can be a regular shape such as ellipse, circle, or rhombus, or it can be an irregular shape. Depending on the shape of the winding body 1, the electrode assembly can have different shapes. Optionally, the material of the winding body 1 can be aluminum alloy or alloy steel.

[0161] like Figures 1 to 3 As shown, the starting area 111 is part of the outer peripheral surface 11 of the winding body 1 and can be used to adsorb the starting position 21 of the diaphragm 2. The starting area 111 can be an arc-shaped area; the axial dimension of the starting area 111 in the winding body 1 (which can be understood as the width of the starting area 111) is consistent with the axial dimension of the outer peripheral surface 11 in the winding body 1, and is larger than the width of the diaphragm 2, so as to stably adsorb the edge of the diaphragm 2; the circumferential dimension of the starting area 111 in the winding body 1 can be set according to different types of electrode assemblies. For example, for electrode assemblies with high tension, the circumferential dimension of the starting area 111 in the winding body 1 can be lengthened, and vice versa.

[0162] like Figure 3 As shown, the starting position 21 of the diaphragm 2 refers to the portion of the diaphragm 2 of the next electrode assembly that has been attached to the outer peripheral surface 11 of the winding body 1 after the diaphragm 2 between the previous electrode assembly and the next electrode assembly has been cut, and at the end of the cutting of the diaphragm 2. The starting position 21 of the diaphragm 2 belongs to the head diaphragm of the composite sheet body used to form the next electrode assembly; it can also be understood that the portion of the diaphragm 2 that has been attached to the outer peripheral surface 11 of the winding body 1 when the electrode assembly is about to be unwound is the starting position 21 of the diaphragm 2. It should be understood that when the electrode assembly is about to be unwound, the starting position 21 of the diaphragm 2 can be completely adsorbed within the starting area 111. Accordingly, the circumferential dimension of the starting area 111 of the winding body 1 can be determined according to the area of ​​the starting position 21 of the diaphragm 2 covering the outer peripheral surface 11 of the winding body 1.

[0163] like Figure 1 and Figure 2As shown, the adsorption region 112 is part of the outer peripheral surface 11 of the winding body 1 and can be used to adsorb at least one of the diaphragm portion after the winding position 21 in the diaphragm 2 and the laminated layer. The adsorption region 112 can be an arc-shaped region; the axial dimension of the adsorption region 112 in the winding body 1 (which can be understood as the width of the adsorption region 112) is consistent with the axial dimension of the outer peripheral surface 11 in the winding body 1, and is larger than the width of the diaphragm 2, so as to stably adsorb the edge of the diaphragm 2; the circumferential dimension of the adsorption region 112 in the winding body 1 can be set according to different types of electrode assemblies. For example, for electrode assemblies with high tension, the circumferential dimension of the adsorption region 112 in the winding body 1 can be lengthened, and vice versa. The number of adsorption regions 112 can be one, two, three or even more; when there are multiple adsorption regions 112, the multiple adsorption regions 112 can be arranged sequentially along the circumference of the winding body 1 starting from the starting area 111, and the area of ​​each adsorption region 112 can be the same or different.

[0164] Understandably, during the winding of the electrode assembly, the starting area 111 first adsorbs the starting position 21 of the head diaphragm that forms the composite sheet of the electrode assembly. If the entire area of ​​the head diaphragm can be completely adsorbed within the starting area 111, then the adsorption area 112 can only adsorb the composite sheet layer. If only a portion of the head diaphragm can be adsorbed within the starting area 111, then the adsorption area 112 can only adsorb the portion of the head diaphragm excluding the starting position 21, or the starting area of ​​the adsorption area 112 can adsorb the portion of the head diaphragm excluding the starting position 21, and the remaining area of ​​the adsorption area 112 can adsorb the composite sheet layer.

[0165] like Figure 1 and Figure 3 As shown, the adsorption holes (including the first adsorption hole 11111 and the second adsorption hole 11211) are used to adsorb the wound portion of the electrode assembly onto the outer peripheral surface 11 of the winding body 1. The number of adsorption holes in the wound area 111 and the same adsorption area 112 can be ten, twenty, thirty, forty or even more. The shape of the adsorption holes can be a regular shape such as rectangle, strip, circle, or ellipse, or an irregular shape. Multiple shapes of adsorption holes can be arranged together on the outer peripheral surface 11. The number of adsorption holes can be set according to the structure and shape of the electrode assembly, thereby avoiding damage to the electrode assembly while adsorbing it.

[0166] like Figure 1 and Figure 2As shown, the negative pressure chamber 12 is used to provide negative pressure. The negative pressure chamber 12 can be connected to a vacuum device (e.g., a vacuum pump). The vacuum device can extract air from the negative pressure chamber 12, so that negative pressure can be generated inside the negative pressure chamber 12. Since the winding area 111 and the adsorption area 112 are connected to the negative pressure chamber 12 through adsorption holes in their respective areas, adsorption force can be generated at the adsorption holes in both the winding area 111 and the adsorption area 112, so that the winding part of the electrode assembly can be adsorbed onto the outer peripheral surface 11 of the winding body 1. The negative pressure chamber 12 is formed inside the winding body 1 and can be distributed close to the outer peripheral surface 11 of the winding body 1. The negative pressure chamber 12 has a fan-shaped cross-section along the axis perpendicular to the winding body 1, and the center of the fan coincides with the axis of the winding body 1.

[0167] It should be understood that, as Figure 1 and Figure 2 As shown, in addition to the starting area 111 and the adsorption area 112, a non-adsorption area 113 can also be arranged on the outer peripheral surface 11 of the winding body 1. The non-adsorption area 113 may not have adsorption holes and does not have a corresponding negative pressure cavity 12. The non-adsorption area 113 is mainly used for the bonding and support of the diaphragm 2.

[0168] In the above technical solution, by opening an adsorption hole on the outer peripheral surface 11 of the winding body 1, the negative pressure provided by the negative pressure chamber 12 enables the adsorption hole to generate an adsorption force, which can adsorb and fix the diaphragm 2, saving the time of clamping and fixing the diaphragm 2 in the traditional solution and improving production efficiency.

[0169] Furthermore, a winding area 111 and an adsorption area 112 are provided on the outer peripheral surface 11. The winding area 111 is used to adsorb the winding position 21 of the diaphragm 2, and the sum of the adsorption forces at the adsorption holes in the winding area 111 is greater than the sum of the adsorption forces at the adsorption holes in any adsorption area 112. This allows a larger adsorption force to be distributed to the winding area 111, so that the winding position 21 of the diaphragm 2 can be stably attached to the winding area 111, thereby improving the problem of the diaphragm 2 easily slipping and wrinkling during the electrode assembly manufacturing process.

[0170] Furthermore, compared to the scheme where the adsorption force allocated to the starting zone 111 and each adsorption zone 112 is consistent or relatively balanced, this scheme allocates the adsorption force so that the starting zone 111 receives more adsorption force than other adsorption zones 112, thereby stabilizing the starting position 21 of the diaphragm 2 and optimizing the distribution of adsorption force. At the same time, while achieving the purpose of stabilizing the starting position 21 of the diaphragm 2, the above two adsorption force distribution schemes do not require this scheme to match the adsorption force of each adsorption zone 112 with that of the starting zone 111, which can result in lower negative pressure energy consumption.

[0171] refer to Figure 2 , Figure 2 This is a three-dimensional structural diagram of a first type of needle coil structure provided according to some embodiments of this application, taken from a second angle.

[0172] In some embodiments, such as Figure 2 As shown, at least two adsorption zones 112 are distributed on the outer peripheral surface 11 of the wound body 1; along the direction opposite to the rotation direction of the wound body 1 and starting from the starting zone 111, the total adsorption force of all adsorption zones shows a decreasing trend. The total adsorption force of the adsorption zones is the sum of the adsorption forces at all the second adsorption holes 11211 within the same adsorption zone 112.

[0173] This can also be understood as follows: a starting area 111 and at least two adsorption areas 112 are arranged on the outer peripheral surface 11. For ease of description, all adsorption areas 112 arranged in the opposite direction to the rotation direction of the winding body 1, starting from the starting area 111, are sequentially defined as the first adsorption area 112a, the second adsorption area 112b, ..., the Kth adsorption area (K is a positive integer). Among them, the sum of the adsorption forces at all the first adsorption holes 11111 in the starting area 111 is the largest, and then the sum of the adsorption forces at the second adsorption holes 11211 in the first adsorption area 112a, the second adsorption area 112b, ..., the Kth adsorption area shows a decreasing trend.

[0174] The rotation direction of the winding body 1 refers to the direction in which the winding body 1 can rotate along its own axis during the winding process of the electrode assembly.

[0175] Optionally, the total adsorption force of all adsorption zones can decrease sequentially, starting from the starting zone 111, in the direction opposite to the rotation direction of the winding body 1.

[0176] In the above technical solution, by setting the sum of the adsorption forces at the adsorption holes in all adsorption zones 112 to show a decreasing trend, and since the sum of the adsorption forces at the adsorption holes in the starting zone 111 is greater than the sum of the adsorption forces at the adsorption holes in any adsorption zone 112, the total adsorption force in the starting zone 111 and each adsorption zone 112 can show a decreasing trend in the opposite direction to the rotation direction of the winding body 1; thus, in the initial stage of winding the electrode assembly, the diaphragm 2 can be gradually adsorbed onto the outer peripheral surface 11 of the winding body 1, and in this process, the adsorption force of the adsorbed diaphragm 2 can be gradually reduced in a stepwise manner, so that the diaphragm portion already adsorbed on the outer peripheral surface 11 will not shift due to excessive subsequent adsorption force, thereby further improving the problem of the diaphragm 2 being prone to slippage and wrinkling, and improving the quality of the electrode assembly.

[0177] refer to Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structural schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application, showing a first angle. Figure 2This is a three-dimensional structural diagram of a first type of needle coil structure provided according to some embodiments of this application, taken from a second angle.

[0178] In some embodiments, such as Figure 1 and Figure 2 As shown, the sum of the cross-sectional areas of all the first adsorption holes 11111 in the starting area 111 is the first total cross-sectional area, and the sum of the cross-sectional areas of all the second adsorption holes 11211 in the same adsorption area 112 is the second total cross-sectional area. The first total cross-sectional area is greater than the second total cross-sectional area.

[0179] The cross-sectional area of ​​the adsorption pore (including the cross-sectional area of ​​the first adsorption pore 11111 and the cross-sectional area of ​​the second adsorption pore 11211) refers to the area of ​​the cross section of the adsorption pore along the direction perpendicular to the opening direction (the direction of the depth extension of the adsorption pore).

[0180] It should be noted that the adsorption force at the adsorption pore is positively correlated with the cross-sectional area of ​​the adsorption pore and the absolute value of the negative pressure. Therefore, under the same negative pressure, the larger the cross-sectional area of ​​the adsorption pore, the greater the adsorption force at the adsorption pore.

[0181] In the above technical solution, by setting the total cross-sectional area of ​​the adsorption holes in the starting area 111 to be greater than the total cross-sectional area of ​​the adsorption holes in any adsorption area 112, under the condition of providing the same negative pressure to the starting area 111 and each adsorption area 112, the sum of the adsorption forces at the adsorption holes in the starting area 111 is greater than the sum of the adsorption forces at the adsorption holes in any adsorption area 112. This allows a larger adsorption force to be distributed to the starting area 111, so that the starting position 21 of the diaphragm 2 can be stably attached to the starting area 111, thereby improving the problem of slippage and wrinkling of the diaphragm 2 during the electrode assembly manufacturing process.

[0182] Moreover, this solution can configure different adsorption forces for the starting zone 111 and each adsorption zone 112 by changing the total cross-sectional area of ​​the adsorption holes in the starting zone 111 and the adsorption zone 112. The provided negative pressure only needs to be continuously and stably output, without the need to set different negative pressures for the starting zone 111 and each adsorption zone 112 or to make excessive adjustments to the negative pressure. This simplifies the operation of adjusting the negative pressure output and reduces the difficulty of adjustment. Furthermore, the stable negative pressure output can make the adsorption force of the starting zone 111 and each adsorption zone 112 more stable and precise.

[0183] In addition, compared with the scheme of arranging adsorption holes with equal total cross-sectional area in the starting zone 111 and the adsorption zone 112, and increasing the adsorption force in the starting zone 111 by increasing the negative pressure output, this scheme can improve the adsorption force in the starting zone 111 by changing the total cross-sectional area of ​​the adsorption holes in the starting zone 111. In comparison, the negative pressure energy consumption of this scheme is lower than that of the two schemes.

[0184] refer to Figures 5 to 8, Figure 5 This is a three-dimensional structural diagram of the first type of needle coil structure provided according to some embodiments of this application from a third angle; Figure 6 This is a schematic front view of a first type of needle coil structure provided according to some embodiments of this application; Figure 7 This is a bottom view schematic diagram of a first type of needle coil structure provided according to some embodiments of this application; Figure 8 This is a top view schematic diagram of a first type of needle coil structure provided according to some embodiments of this application.

[0185] In some embodiments, such as Figures 5 to 8 As shown, at least two adsorption regions 112 are distributed on the outer peripheral surface 11 of the winding body 1; along the direction opposite to the rotation direction of the winding body 1 and starting from the starting region 111, all the second total cross-sectional areas show a decreasing trend. Wherein, the second total cross-sectional area is the sum of the cross-sectional areas of all the second adsorption holes 11211 in the same adsorption region 112.

[0186] This can also be understood as follows: a starting area 111 and at least two adsorption areas 112 are arranged on the outer peripheral surface 11. For ease of description, all adsorption areas 112 arranged in the opposite direction to the rotation direction of the winding body 1, starting from the starting area 111, are sequentially defined as the first adsorption area 112a, the second adsorption area 112b, ..., the Kth adsorption area (K is a positive integer). Among them, the sum of the cross-sectional areas of all the first adsorption holes 11111 in the starting area 111 is the largest, and then the sum of the cross-sectional areas of the second adsorption holes 11211 in the first adsorption area 112a, the second adsorption area 112b, ..., the Kth adsorption area shows a decreasing trend.

[0187] Optionally, all second total cross-sectional areas can decrease sequentially in the direction opposite to the rotation direction of the winding body 1 and starting from the starting area 111.

[0188] In the above technical solution, by setting the total cross-sectional area of ​​the adsorption holes in all adsorption zones 112 to show a decreasing trend, and since the total cross-sectional area of ​​the adsorption holes in the starting zone 111 is greater than the total cross-sectional area of ​​the adsorption holes in any adsorption zone 112, under the same negative pressure, the total adsorption force in the starting zone 111 and each adsorption zone 112 can show a decreasing trend in the opposite direction to the rotation direction of the winding body 1. In this way, at the beginning stage of winding the electrode assembly, the diaphragm 2 can be gradually adsorbed onto the outer peripheral surface 11 of the winding body 1. During this process, the adsorption force of the adsorbed diaphragm 2 can be gradually reduced in a stepwise manner, so that the diaphragm part already adsorbed on the outer peripheral surface 11 will not shift due to excessive subsequent adsorption force. This can further improve the problem of the diaphragm 2 being prone to slippage and wrinkling, and improve the quality of the electrode assembly.

[0189] refer to Figure 6 , Figure 6 This is a front view schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application.

[0190] In some embodiments, the ratio of the sum of the cross-sectional areas of all the first adsorption holes 11111 in the winding zone 111 to the area of ​​the winding zone 111 is G, where G satisfies: 0.05 ≤ G ≤ 0.6. For example, G can be 0.05, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, etc.

[0191] The area of ​​the starting zone 111 refers to the area occupied by the starting zone 111 on the outer peripheral surface 11 of the winding body 1. The area of ​​the starting zone 111 includes the area occupied by each first adsorption hole 11111 within the starting zone 111.

[0192] It should be noted that G can be understood as the porosity within the starting zone 111, that is, the area ratio of the first adsorption hole 11111 within the starting zone 111.

[0193] It should be understood that by limiting G to be greater than or equal to 0.05, the opening ratio of the first adsorption hole 11111 in the winding zone 111 is at least 5%, so that the total cross-sectional area of ​​the first adsorption hole 11111 in the winding zone 111 is not too small, so that sufficient adsorption force can be provided through the first adsorption hole 11111 in the winding zone 111 to adsorb and fix the winding position 21 of the diaphragm 2.

[0194] Accordingly, such as Figure 6 As shown, by limiting G to less than or equal to 0.6, the opening ratio of the first adsorption hole 11111 in the winding zone 111 is at most 60%, thus ensuring that the total cross-sectional area of ​​the first adsorption hole 11111 in the winding zone 111 is not too large. Sufficient support area is provided within the winding zone 111 to support and adhere the winding position 21 of the diaphragm 2. This prevents the winding position 21 of the diaphragm 2 from being sunken into the first adsorption hole 11111 due to an excessively large area proportion, which would otherwise cause wrinkling of the winding position 21 of the diaphragm 2. The support area of ​​the winding zone 111 is the area of ​​the winding zone 111 minus the area occupied by the first adsorption hole 11111 within the winding zone 111. Simultaneously, by setting an upper limit for G, the area proportion of the first adsorption hole 11111 in the winding zone 111 is not too large, reducing the impact on the structural strength of the winding zone 111.

[0195] In the above technical solution, by limiting the total cross-sectional area of ​​the first adsorption hole 11111 in the winding area 111, the area occupied by the first adsorption hole 11111 in the winding area 111 is appropriate, which can not only stably adsorb the winding position 21 of the diaphragm 2, but also provide sufficient support for the winding position 21 of the diaphragm 2.

[0196] refer to Figure 4 and Figure 6 , Figure 4 This is a three-dimensional structural schematic diagram of a second type of coiled needle structure provided according to some embodiments of this application, showing a first angle. Figure 6 This is a front view schematic diagram of a first type of coiled needle structure provided according to some embodiments of this application.

[0197] In some embodiments, the cross-sectional area of ​​the first adsorption pore 11111 is greater than or equal to 0.19 square millimeters and less than or equal to 20 square millimeters. For example, the cross-sectional area of ​​the first adsorption pore 11111 can be 0.19 square millimeters, 0.2 square millimeters, 0.5 square millimeters, 1 square millimeter, 3 square millimeters, 5 square millimeters, 8 square millimeters, 10 square millimeters, 12 square millimeters, 15 square millimeters, 18 square millimeters, 20 square millimeters, etc.

[0198] For example, such as Figure 6 As shown, if the first adsorption hole 11111 is a round hole, the opening diameter of the first adsorption hole 11111 can be between 0.5 mm and 5 mm; for example, the opening diameter of the first adsorption hole 11111 can be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0199] It should be understood that by limiting the cross-sectional area of ​​the first adsorption hole 11111 to be greater than or equal to 0.19 square millimeters, the cross-sectional area of ​​the first adsorption hole 11111 is not too small. Since the adsorption force is positively correlated with the cross-sectional area of ​​the adsorption hole, it is necessary to set a lower limit for the cross-sectional area of ​​the first adsorption hole 11111 to provide a first adsorption hole 11111 with a sufficiently large cross-sectional area, which can provide sufficient adsorption force to adsorb and fix the starting position 21 of the diaphragm 2.

[0200] Accordingly, by limiting the cross-sectional area of ​​the first adsorption hole 11111 to less than or equal to 20 square millimeters, the cross-sectional area of ​​the first adsorption hole 11111 is not too large, so that the diaphragm 2 is not easily sucked into the first adsorption hole 11111, thereby improving the situation where the starting position 21 of the diaphragm 2 is prone to wrinkling due to being trapped in the first adsorption hole 11111.

[0201] In the above technical solution, by limiting the cross-sectional area of ​​the first adsorption hole 11111, the cross-sectional area of ​​the first adsorption hole 11111 is made suitable, which can provide sufficient adsorption force to adsorb and fix the starting position 21 of the diaphragm 2, and also prevent the starting position 21 of the diaphragm 2 from wrinkling due to being sucked into the first adsorption hole 11111.

[0202] It should be noted that, as Figure 4As shown, the first adsorption hole 11111 can also be a strip-shaped hole. The strip-shaped holes can extend in different directions and be distributed within the winding area 111; for example, the length direction of the strip-shaped hole can be consistent with the circumferential direction of the wound body 1, or the length direction of the strip-shaped hole can be consistent with the axial direction of the wound body 1, etc. For example, the width of the strip-shaped hole can range from 0.5 mm to 5 mm; for example, the width of the strip-shaped hole can be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. The length of the strip-shaped hole can be matched and set according to the range of the winding area 111 and the circumferential and axial dimensions of the wound body 1.

[0203] refer to Figure 7 , Figure 7 This is a bottom view of a first type of needle coil structure provided according to some embodiments of this application.

[0204] In some embodiments, the ratio of the sum of the cross-sectional areas of all the second adsorption pores 11211 within the same adsorption region 112 to the area of ​​the adsorption region 112 is H, where H satisfies: 0.02 ≤ H ≤ 0.5. For example, H can be 0.02, 0.05, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, etc.

[0205] The area of ​​the adsorption region 112 refers to the area occupied by the adsorption region 112 on the outer peripheral surface 11 of the winding body 1. The area of ​​the adsorption region 112 includes the area occupied by each second adsorption hole 11211 within the adsorption region 112.

[0206] It should be noted that H can be understood as the porosity within the adsorption region 112, that is, the area ratio of the second adsorption pore 11211 within the adsorption region 112.

[0207] It should be understood that by limiting H to be greater than or equal to 0.02, the porosity of the second adsorption pore 11211 in the adsorption region 112 is at least 2%, so that the total cross-sectional area of ​​the second adsorption pore 11211 in the adsorption region 112 is not too small, so that sufficient adsorption force can be provided through the second adsorption pore 11211 in the adsorption region 112 to adsorb and fix at least one of the membrane 2 and the laminate.

[0208] Accordingly, such as Figure 7As shown, by limiting H to less than or equal to 0.5, the porosity of the second adsorption pore 11211 within the adsorption region 112 is at most 50%, thus preventing the total cross-sectional area of ​​the second adsorption pore 11211 within the adsorption region 112 from being too large. Sufficient supporting area is provided within the adsorption region 112 to support and adhere at least one of the diaphragm 2 and the laminated layer, preventing the diaphragm 2 and at least one of the laminated layer from sinking into the second adsorption pore 11211 due to its excessive area proportion, thereby avoiding wrinkling of the diaphragm 2 and at least one of the laminated layer. The supporting area of ​​the adsorption region 112 is the area of ​​the adsorption region 112 minus the area occupied by the second adsorption pore 11211 within the adsorption region 112. Simultaneously, by setting an upper limit for H, the area proportion of the second adsorption pore 11211 within the adsorption region 112 is prevented from being too large, reducing the impact on the structural strength of the adsorption region 112.

[0209] In the above technical solution, by limiting the total cross-sectional area of ​​the second adsorption pore 11211 in the adsorption region 112, the area occupied by the second adsorption pore 11211 in the adsorption region 112 is appropriate, which can not only stably adsorb at least one of the diaphragm 2 and the laminated layer, but also provide sufficient support for at least one of the diaphragm 2 and the laminated layer.

[0210] refer to Figure 7 , Figure 7 This is a bottom view of a first type of needle coil structure provided according to some embodiments of this application.

[0211] In some embodiments, such as Figure 7 As shown, the cross-sectional area of ​​the second adsorption pore 11211 is greater than or equal to 0.19 square millimeters and less than or equal to 20 square millimeters. For example, the cross-sectional area of ​​the second adsorption pore 11211 can be 0.19 square millimeters, 0.2 square millimeters, 0.5 square millimeters, 1 square millimeter, 3 square millimeters, 5 square millimeters, 8 square millimeters, 10 square millimeters, 12 square millimeters, 15 square millimeters, 18 square millimeters, 20 square millimeters, etc.

[0212] For example, if the second adsorption hole 11211 is a round hole, the opening diameter of the second adsorption hole 11211 can be between 0.5 mm and 5 mm; for example, the opening diameter of the second adsorption hole 11211 can be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0213] It should be understood that by limiting the cross-sectional area of ​​the second adsorption pore 11211 to be greater than or equal to 0.19 square millimeters, the cross-sectional area of ​​the second adsorption pore 11211 is not too small. Since the adsorption force is positively correlated with the cross-sectional area of ​​the adsorption pore, it is necessary to set a lower limit for the cross-sectional area of ​​the second adsorption pore 11211 to provide a second adsorption pore 11211 with a sufficiently large cross-sectional area, which can provide sufficient adsorption force to adsorb and fix at least one of the membrane 2 and the laminate.

[0214] Accordingly, by limiting the cross-sectional area of ​​the second adsorption pore 11211 to less than or equal to 20 square millimeters, the cross-sectional area of ​​the second adsorption pore 11211 is not too large, so that at least one of the diaphragm 2 and the laminated layer is not easily drawn into the second adsorption pore 11211, thereby improving the situation where at least one of the diaphragm 2 and the laminated layer is prone to wrinkling due to being trapped in the second adsorption pore 11211.

[0215] In the above technical solution, by limiting the cross-sectional area of ​​the second adsorption hole 11211, the cross-sectional area of ​​the second adsorption hole 11211 is made suitable, which can provide sufficient adsorption force to adsorb and fix at least one of the diaphragm 2 and the laminated layer, and can also prevent the diaphragm 2 and the laminated layer from wrinkling due to being sucked into the second adsorption hole 11211.

[0216] It should be noted that the second adsorption hole 11211 can also be a strip-shaped hole, which can extend in different directions and be distributed within the winding area 111; for example, the length direction of the strip-shaped hole can be consistent with the circumferential direction of the winding body 1, or the length direction of the strip-shaped hole can be consistent with the axial direction of the winding body 1, etc. For example, the width of the strip-shaped hole can be between 0.5 mm and 5 mm; for example, the width of the strip-shaped hole can be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. The length of the strip-shaped hole can be matched and set according to the range of the winding area 111 and the circumferential and axial dimensions of the winding body 1. Of course, the foregoing limitation on the range of the width of the strip-shaped hole and the description of the length of the strip-shaped hole are merely exemplary, and the comparison of the embodiments in this application is not limiting.

[0217] refer to Figure 9 , Figure 9 This is a front view schematic diagram of a third type of needle coil structure provided according to some embodiments of this application.

[0218] In some embodiments, such as Figure 9 As shown, along the direction opposite to the rotation direction of the winding body 1, the cross-sectional area of ​​the multiple first adsorption holes 11111 in the winding area 111 shows a decreasing trend.

[0219] Since the adsorption force at the first adsorption hole 11111 is positively correlated with the cross-sectional area of ​​the first adsorption hole 11111 and the absolute value of the negative pressure, under the same negative pressure, the larger the cross-sectional area of ​​the first adsorption hole 11111, the greater the adsorption force at the first adsorption hole 11111. Therefore, by adopting a method in the winding zone 111 where the cross-sectional area of ​​the first adsorption hole 11111 tends to decrease, and by providing the same negative pressure to each first adsorption hole 11111, the adsorption force at the first adsorption hole 11111 in the winding zone 111 can tend to decrease in the direction opposite to the rotation direction of the winding body 1.

[0220] Optionally, the cross-sectional areas of the plurality of first adsorption holes 11111 in the starting area 111 can decrease sequentially in the direction opposite to the rotation direction of the winding body 1.

[0221] In the above technical solution, by setting the cross-sectional area of ​​the first adsorption hole 11111 in the winding area 111 to show a decreasing trend, the adsorption force in the winding area 111 can show a decreasing trend in the opposite direction to the rotation direction of the winding body 1. In this way, at the beginning stage of winding the electrode assembly, the starting position 21 of the diaphragm 2 can be gradually adsorbed on the winding area 111. In this process, the adsorption force of the adsorbed diaphragm 2 can be gradually reduced in a stepwise manner, so that the diaphragm part already adsorbed on the winding area 111 will not be displaced due to the subsequent excessive adsorption force. This can further improve the problem of the diaphragm 2 being prone to slipping and wrinkling, and improve the quality of the electrode assembly.

[0222] refer to Figure 9 , Figure 9 This is a front view schematic diagram of a third type of needle coil structure provided according to some embodiments of this application.

[0223] In some embodiments, such as Figure 9 As shown, along the direction opposite to the rotation direction of the winding body 1, the cross-sectional area of ​​the plurality of second adsorption holes 11211 in at least one adsorption region 112 tends to decrease.

[0224] Since the adsorption force at the second adsorption hole 11211 is positively correlated with the cross-sectional area of ​​the second adsorption hole 11211 and the absolute value of the negative pressure, under the same negative pressure, the larger the cross-sectional area of ​​the second adsorption hole 11211, the greater the adsorption force at the second adsorption hole 11211. Therefore, by adopting a method in which the cross-sectional area of ​​the second adsorption hole 11211 tends to decrease within the adsorption zone 112, and by providing the same negative pressure to each second adsorption hole 11211, the adsorption force at the second adsorption hole 11211 within the adsorption zone 112 can decrease in the direction opposite to the rotation direction of the winding body 1.

[0225] Optionally, along the direction opposite to the rotation direction of the winding body 1, the cross-sectional area of ​​the plurality of second adsorption holes 11211 in at least one adsorption region 112 may decrease sequentially.

[0226] In the above technical solution, by setting the cross-sectional area of ​​the second adsorption hole 11211 in the adsorption region 112 to show a decreasing trend, the adsorption force in the adsorption region 112 can show a decreasing trend in the opposite direction to the rotation direction of the winding body 1. In this way, during the winding of the electrode assembly, at least one of the diaphragm 2 and the laminated layer can be gradually adsorbed onto the adsorption region 112. During this process, the adsorption force of the diaphragm 2 and the laminated layer can be gradually reduced in a stepwise manner, so that the diaphragm 2 and the laminated layer that have been adsorbed onto the adsorption region 112 will not shift due to excessive subsequent adsorption force. This can further improve the problem of the diaphragm 2 being prone to slippage and wrinkling, and improve the quality of the electrode assembly.

[0227] It should be understood that, as Figure 9 As shown, on the outer peripheral surface 11 of the winding body 1, a scheme in which the cross-sectional area of ​​multiple first adsorption holes 11111 in the winding zone 111 tends to decrease and a scheme in which the cross-sectional area of ​​multiple second adsorption holes 11211 in the adsorption zone 112 tends to decrease can be arranged simultaneously. The adsorption force between adjacent winding zones 111 and adsorption zones 112, and between two adjacent adsorption zones 112, can be designed to gradually decrease in a stepped manner, so that the adsorption force between the winding zones 111 and adsorption zones 112, and between two adjacent adsorption zones 112, can transition smoothly, allowing the diaphragm 2 to be smoothly adsorbed and fixed. Of course, the corresponding scheme can also be arranged only in the winding zone 111 or only in the adsorption zone 112 on the outer peripheral surface 11 of the winding body 1; moreover, when there are multiple adsorption zones 112, the corresponding scheme can be arranged in at least a portion of the adsorption zones 112.

[0228] refer to Figure 10 , Figure 10 This is a three-dimensional structural diagram of a fourth type of needle coiling structure provided according to some embodiments of this application, taken from a first angle.

[0229] In some embodiments, such as Figure 10 As shown, the negative pressure chamber 12 is provided with a connection end 121 communicating with a vacuum device on one side of the winding body 1 along the axial direction; along the axial direction of the winding body 1, the cross-sectional area of ​​the multiple first adsorption holes 11111 in the winding area 111 shows an increasing trend, and in the axial direction of the winding body 1, the cross-sectional area of ​​the first adsorption hole 11111 near the connection end 121 is smaller than the cross-sectional area of ​​the first adsorption hole 11111 away from the connection end 121.

[0230] It should be noted that the vacuum equipment extracts air from the negative pressure chamber 12 from the connection end 121, creating a negative pressure within the negative pressure chamber 12, which can then be supplied to the first adsorption holes 11111. In the initial stage of providing negative pressure, the absolute value of the negative pressure near the connection end 121 within the negative pressure chamber 12 is greater than the absolute value of the negative pressure away from the connection end 121. This results in different negative pressures being obtained by the multiple first adsorption holes 11111 distributed along the axial direction of the winding body 1. Specifically, the negative pressure obtainable at the first adsorption holes 11111 near the connection end 121 along the axial direction of the winding body 1 is greater than the negative pressure obtainable at the first adsorption holes 11111 away from the connection end 121. This may cause different adsorption forces among the multiple first adsorption holes 11111 distributed along the axial direction of the winding body 1, which can easily cause the starting position 21 of the diaphragm 2 to shift along the axial direction of the winding body 1.

[0231] Considering that the magnitude of the adsorption force at the first adsorption hole 11111 is positively correlated with the cross-sectional area of ​​the first adsorption hole 11111 and the absolute value of the negative pressure, the cross-sectional area of ​​the first adsorption hole 11111 in the winding area 111 can be set to increase from the connecting end 121 along the axial direction of the winding body 1. That is, the cross-sectional area of ​​the first adsorption hole 11111 near the connecting end 121 along the axial direction of the winding body 1 is smaller than the cross-sectional area of ​​the first adsorption hole 11111 far from the connecting end 121. This can make the adsorption force at the multiple first adsorption holes 11111 arranged along the axial direction of the winding body 1 more consistent, thereby reducing the probability of the starting position 21 of the diaphragm 2 shifting along the axial direction of the winding body 1.

[0232] Optionally, along the axial direction of the winding body 1, the cross-sectional area of ​​the plurality of first adsorption holes 11111 in the winding area 111 can increase sequentially.

[0233] In the above technical solution, by setting the cross-sectional area of ​​the first adsorption hole 11111 in the starting area 111 to increase from the connecting end 121 along the axial direction of the winding body 1, the adsorption force of the multiple first adsorption holes 11111 distributed along the axial direction of the winding body 1 can be made consistent in the early stage of providing negative pressure, so as to synchronously and stably adsorb and fix the starting position 21 of the diaphragm 2 in the axial direction of the winding body 1.

[0234] refer to Figure 10 , Figure 10 This is a three-dimensional structural diagram of a fourth type of needle coiling structure provided according to some embodiments of this application, taken from a first angle.

[0235] In some embodiments, such as Figure 10As shown, the negative pressure chamber 12 is provided with a connection end 121 communicating with a vacuum device on one side of the axial direction of the winding body 1; along the axial direction of the winding body 1, the cross-sectional area of ​​a plurality of second adsorption holes 11211 in at least one adsorption area 112 tends to increase, and in the axial direction of the winding body 1, the cross-sectional area of ​​the second adsorption hole 11211 near the connection end 121 is smaller than the cross-sectional area of ​​the second adsorption hole 11211 away from the connection end 121.

[0236] Referring to the scheme described above where the cross-sectional area of ​​the first adsorption hole 11111 in the starting area 111 increases from the connecting end 121 along the axial direction of the winding body 1, it can be seen that by setting the cross-sectional area of ​​the second adsorption hole 11211 in the adsorption area 112 to increase from the connecting end 121 along the axial direction of the winding body 1, the adsorption force at the multiple second adsorption holes 11211 arranged along the axial direction of the winding body 1 can be made more consistent, thereby reducing the probability of the diaphragm 2 / or the electrode 3 stacked on the diaphragm 2 shifting along the axial direction of the winding body 1.

[0237] Optionally, along the axial direction of the winding body 1, the cross-sectional area of ​​a plurality of second adsorption holes 11211 within at least one adsorption region 112 may increase sequentially.

[0238] In the above technical solution, by setting the cross-sectional area of ​​the second adsorption hole 11211 in the adsorption zone 112 to increase from the connecting end 121 along the axial direction of the winding body 1, the adsorption force of the multiple second adsorption holes 11211 distributed along the axial direction of the winding body 1 can be made consistent in the early stage of providing negative pressure, so as to be able to synchronously and stably adsorb and fix at least one of the diaphragm 2 and the laminate in the axial direction of the winding body 1.

[0239] It should be understood that, as Figure 10 As shown, on the outer peripheral surface 11 of the winding body 1, the scheme in which the cross-sectional area of ​​the first adsorption hole 11111 in the starting area 111 increases from the connecting end 121 along the axial direction of the winding body 1, and the scheme in which the cross-sectional area of ​​the second adsorption hole 11211 in the adsorption area 112 increases from the connecting end 121 along the axial direction of the winding body 1, can be arranged simultaneously, or the corresponding scheme can be arranged only in the starting area 111, or only in the adsorption area 112. Moreover, when there are multiple adsorption areas 112, the corresponding scheme can be arranged in at least a portion of the adsorption areas 112.

[0240] refer to Figure 11 , Figure 11 This is a front view schematic diagram of a fifth type of coiled needle structure provided according to some embodiments of this application.

[0241] In some embodiments, any two adjacent first adsorption holes 11111 are offset in the circumferential direction of the winding body 1.

[0242] In the above technical solution, the staggered design of any two adjacent first adsorption holes 11111 in the circumferential direction of the winding body 1 can make the distribution of the first adsorption holes 11111 in the winding area 111 more dense, which is conducive to further improving the stability of the diaphragm after it is adsorbed and fixed.

[0243] Furthermore, such as Figure 11 As shown, some of the first adsorption holes 11111 are arranged along the axial direction of the winding body 1 to form a first hole row 1111, and multiple first hole rows 1111 are arranged along the circumferential direction of the winding body 1 in the winding area 111.

[0244] The number of first adsorption pores 11111 in the first pore row 1111 is at least two; for example, the number of first adsorption pores 11111 in the first pore row 1111 can be two, three, four, etc.

[0245] In the above technical solution, by setting a row of first adsorption holes 11111 in the axial direction of the winding body 1, an adsorption force distributed along the axial direction of the winding body 1 can be formed in the winding zone 111, which can provide sufficient adsorption force for the winding position 21 of the diaphragm 2 in the width direction of the diaphragm 2, so that the winding position 21 of the diaphragm 2 can be more stably adsorbed in the winding zone 111.

[0246] Furthermore, such as Figure 11 As shown, in two adjacent rows of first holes 1111, any two first adsorption holes 11111 are staggered in the circumferential direction of the winding body 1.

[0247] The number of first pore rows 1111 is at least two; for example, the number of first pore rows 1111 can be two, three, four, etc. Moreover, the number of first adsorption pores 11111 within different first pore rows 1111 can be different.

[0248] In the above technical solution, any two first adsorption holes 11111 are staggered in the circumferential direction of the winding body 1 within two adjacent first hole rows 1111. This can shorten the distance between two adjacent first hole rows 1111 in the circumferential direction of the winding body 1 and make the distribution of first adsorption holes 11111 in the winding area 111 more dense. At the same time, it can increase the area ratio of first adsorption holes 11111 in the limited winding area 111, which is beneficial to further improve the stability of the diaphragm 2 after the winding position 21 is adsorbed and fixed.

[0249] refer to Figure 11 , Figure 11 This is a front view schematic diagram of a fifth type of coiled needle structure provided according to some embodiments of this application.

[0250] In some embodiments, any two adjacent second adsorption holes 11211 are staggered in the circumferential direction of the winding body 1.

[0251] In the above technical solution, the staggered design of two adjacent second adsorption holes 11211 in the circumferential direction of the winding body 1 can make the second adsorption holes 11211 in the adsorption area 112 more densely distributed, which is conducive to further improving the stability of the membrane after it is adsorbed and fixed.

[0252] Furthermore, such as Figure 11 As shown, some of the second adsorption holes 11211 are arranged along the axial direction of the winding body 1 to form a second hole row 1121, and at least one adsorption region 112 is arranged along the circumferential direction of the winding body 1 to form a plurality of second hole rows 1121.

[0253] The number of first adsorption pores 11111 in the second pore row 1121 is at least two; for example, the number of first adsorption pores 11111 in the second pore row 1121 can be two, three, four, etc.

[0254] In the above technical solution, by providing a row of second adsorption holes 11211 in the axial direction of the winding body 1, an adsorption force distributed along the axial direction of the winding body 1 can be formed in the adsorption zone 112. This provides sufficient adsorption force for at least one of the diaphragm 2 and the laminated layer in the width direction, so that at least one of the diaphragm 2 and the laminated layer can be more stably adsorbed in the adsorption zone 112.

[0255] Furthermore, such as Figure 11 As shown, in any two adjacent second hole rows 1121, any two second adsorption holes 11211 are staggered in the circumferential direction of the winding body 1.

[0256] The number of second pore rows 1121 is at least two; for example, the number of second pore rows 1121 can be two, three, four, etc. Moreover, the number of second adsorption pores 11211 in different second pore rows 1121 can be different.

[0257] In the above technical solution, any two second adsorption holes 11211 in two adjacent second hole rows 1121 are staggered in the circumferential direction of the winding body 1, which can shorten the distance between two adjacent second hole rows 1121 in the circumferential direction of the winding body 1 and make the distribution of second adsorption holes 11211 in the adsorption area 112 more dense. At the same time, it can increase the area ratio of second adsorption holes 11211 in the limited adsorption area 112, which is conducive to further improving the stability of the diaphragm 2 and at least one of the laminated layers after being adsorbed and fixed.

[0258] It should be understood that, as Figure 11As shown, on the outer peripheral surface 11 of the winding body 1, the scheme of setting the first hole row 1111 in the winding zone 111 and the scheme of setting the second hole row 1121 in the adsorption zone 112 can be arranged simultaneously, or the corresponding scheme can be arranged only in the winding zone 111, or the corresponding scheme can be arranged only in the adsorption zone 112. Moreover, when there are multiple adsorption zones 112, the corresponding scheme can be arranged in at least a portion of the adsorption zones 112.

[0259] refer to Figure 12 and Figure 13 , Figure 12 This is a schematic front view of a sixth type of needle coil structure provided according to some embodiments of this application; Figure 13 This is a front view schematic diagram of a seventh type of needle coil structure provided according to some embodiments of this application.

[0260] In some embodiments, such as Figure 12 and Figure 13 As shown, the outer peripheral edge of the winding area 111 includes a first edge 1112, a second edge 1113, and two winding side edges 1114. The first edge 1112 and the second edge 1113 are arranged opposite each other along the circumferential direction of the winding body 1, and the first edge 1112 is closer to the winding end 22 of the diaphragm 2 adsorbed in the winding area 111 than the second edge 1113. The two winding side edges 1114 are arranged opposite each other along the axial direction of the winding body 1, and the two winding side edges 1114 are respectively connected between the first edge 1112 and the second edge 1113. At least a portion of the first adsorption holes 11111 are strip-shaped holes, and at least a portion of the strip-shaped holes are distributed on the first edge 1112 and the two winding side edges 1114.

[0261] Among them, such as Figure 3 As shown, the starting end 22 of the diaphragm 2 refers to the initial position where the diaphragm 2 of the electrode assembly begins to participate in the winding in the initial stage of winding the electrode assembly; for example, after the previous electrode assembly is wound, the diaphragm 2 between the previous electrode assembly and the next electrode assembly needs to be cut. After the diaphragm 2 is cut, the position where the diaphragm 2 of the next electrode assembly is cut can be understood as the starting end 22 of the diaphragm 2.

[0262] Optionally, one or more strip holes may be provided at the first edge 1112.

[0263] Optionally, one or more strip holes may be provided at each of the two starting edge edges 1114.

[0264] Alternatively, the strip hole can be an oblong hole or a rectangular hole in the shape of a strip.

[0265] It should be understood that when the starting position 21 of the diaphragm 2 is adsorbed onto the starting area 111, the starting end 22 of the diaphragm 2 can correspond to the first edge 1112 of the starting area 111, and the two edges of the diaphragm 2 that are arranged opposite to each other along its own width direction can correspond to the two starting side edges 1114 of the starting area 111.

[0266] It should be noted that since the axial dimension of the starting area 111 of the winding body 1 is the same as the axial dimension of the outer peripheral surface 11 of the winding body 1, the two starting side edges 1114 of the starting area 111 correspond to the end edges of the winding body 1 in its axial direction. Based on this, and in order to provide strip holes on the two starting side edges 1114, in this embodiment, at least some of the strip holes are distributed on the two starting side edges 1114, meaning that the strip holes are arranged in the region close to the starting side edges 1114; moreover, the strip holes provided on the two starting side edges 1114 can correspond to the two edges of the diaphragm 2 that are arranged opposite each other in its width direction.

[0267] In the above technical solution, by arranging strip-shaped holes on the first edge 1112 and the two starting edge edges 1114 of the starting area 111, and generating an adsorption force distributed along its length extension direction at the strip-shaped holes, the edge area of ​​the starting position 21 of the diaphragm 2 can be adsorbed over a larger area, so that the edge area of ​​the starting position 21 of the diaphragm 2 can be more stably adsorbed on the starting area 111.

[0268] Furthermore, such as Figure 12 and Figure 13 As shown, the length extension direction of the strip holes distributed on the first edge 1112 is not consistent with the circumferential direction of the winding body 1.

[0269] The extension direction of the strip-shaped holes distributed on the first edge 1112 is not consistent with the circumferential direction of the wound body 1, which may include the following situations: First, the extension direction of the strip-shaped holes distributed on the first edge 1112 may be consistent with the axial direction of the wound body 1, such as... Figure 12 As shown; secondly, the minimum included angle between the length extension direction of the strip holes distributed on the first edge 1112 and the axial direction of the winding body 1 can be an acute angle, such as... Figure 13 As shown.

[0270] In the above technical solution, by setting the length extension direction of the strip holes distributed on the first edge 1112 to be inconsistent with the circumferential direction of the winding body 1, the contact area between these strip holes and the edge area of ​​the starting position 21 of the diaphragm 2 can be increased, so that the adsorption force at these strip holes can adsorb and fix the edge area of ​​the starting position 21 of the diaphragm 2 more, thereby further enhancing the stability of the edge area of ​​the starting position 21 of the diaphragm 2 being adsorbed on the starting area 111.

[0271] Furthermore, such as Figure 12 and Figure 13 As shown, the length extension direction of the strip holes distributed on the two starting edge edges 1114 is not consistent with the axial direction of the winding body 1.

[0272] The extension direction of the strip-shaped holes distributed on the two starting edge edges 1114 is not consistent with the axial direction of the winding body 1. This can include the following situations: First, the extension direction of the strip-shaped holes distributed on the two starting edge edges 1114 can be consistent with the circumferential direction of the winding body 1, such as... Figure 12 As shown; 2. The minimum angle between the length extension direction of the strip holes distributed on the two starting edge edges 1114 and the circumference of the winding body 1 can be an acute angle, such as... Figure 13 As shown.

[0273] In the above technical solution, by setting the length extension direction of the strip holes distributed on the two starting edge 1114 to be inconsistent with the axial direction of the winding body 1, the contact area between these strip holes and the edge area of ​​the starting position 21 of the diaphragm 2 can be increased, so that the adsorption force at these strip holes can adsorb and fix the edge area of ​​the starting position 21 of the diaphragm 2 more, thereby further enhancing the stability of the edge area of ​​the starting position 21 of the diaphragm 2 being adsorbed on the starting area 111.

[0274] refer to Figure 12 and Figure 13 , Figure 12 This is a schematic front view of a sixth type of needle coil structure provided according to some embodiments of this application; Figure 13 This is a front view schematic diagram of a seventh type of needle coil structure provided according to some embodiments of this application.

[0275] In some embodiments, such as Figure 12 and Figure 13 As shown, the outer peripheral edge of the adsorption zone 112 includes two adsorption side edges 1122, which are arranged opposite to each other along the axial direction of the winding body 1; at least a portion of the second adsorption holes 11211 are strip-shaped holes, and at least a portion of the strip-shaped holes are distributed on the two adsorption side edges 1122.

[0276] Referring to the above-mentioned scheme of setting strip holes on the two starting edge edges 1114 of the starting area 111, it can be seen that by setting strip holes on the two adsorption edge edges 1122 of the adsorption area 112, these strip holes can correspond to the two edges of the adsorption membrane 2 that are set opposite to each other in the width direction.

[0277] In the above technical solution, by arranging strip-shaped holes on the two adsorption side edges 1122 of the adsorption zone 112, and generating adsorption forces distributed along the length extension direction of the strip-shaped holes, the edge regions of at least one of the diaphragm 2 and the laminated layer can be adsorbed over a larger area, so that the edge regions of at least one of the diaphragm 2 and the laminated layer can be more stably adsorbed on the adsorption zone 112.

[0278] Furthermore, such as Figure 12 and Figure 13 As shown, the length extension direction of the strip holes distributed on the two adsorption side edges 1122 is not consistent with the axial direction of the winding body 1.

[0279] Referring to the scheme described above where the length extension direction of the strip holes distributed on the two starting edge 1114 is not consistent with the axial direction of the winding body 1, it can be seen that setting the length extension direction of the strip holes distributed on the two adsorption edge 1122 to be inconsistent with the axial direction of the winding body 1 allows the length extension direction of these strip holes to be consistent with the circumferential direction of the winding body 1, or the minimum included angle between them and the circumferential direction of the winding body 1 to be an acute angle. Figure 12 and Figure 13 As shown.

[0280] In the above technical solution, by setting the length extension direction of the strip holes distributed on the two adsorption side edges 1122 to be inconsistent with the axial direction of the winding body 1, the contact area between these strip holes and the edge region of the diaphragm 2 and at least one of the laminated layers can be increased, so that the adsorption force at these strip holes can adsorb and fix more of the edge region of the diaphragm 2 and at least one of the laminated layers, thereby further enhancing the stability of the edge region of the diaphragm 2 and at least one of the laminated layers being adsorbed on the adsorption area 112.

[0281] refer to Figure 14 , Figure 14 This is a right-side view of a first type of needle coil structure provided according to some embodiments of this application.

[0282] In some embodiments, such as Figure 14 As shown, the central angle subtended by the starting zone 111 is α, and the central angle subtended by the adsorption zone 112 is β. α and β satisfy: 1.2 ≤ α / β ≤ 1.5. For example, α / β can be 1.2, 1.3, 1.4, 1.5, etc.

[0283] Specifically, the central angle corresponding to the starting area 111 is: the plane perpendicular to the axis of the winding body 1 is the projection plane, and the orthographic projection of the starting area 111 on the projection plane is an arc, and the central angle corresponding to the arc is the central angle corresponding to the starting area 111.

[0284] It should be noted that the angle of the central angle opposite to the starting area 111 is positively correlated with the circumferential dimension of the starting area 111 in the winding body 1, and the axial dimension of the starting area 111 in the winding body 1 is the same as the axial dimension of the outer circumferential surface 11 in the winding body 1; therefore, it can be seen that the angle of the central angle opposite to the starting area 111 is positively correlated with the area of ​​the starting area 111.

[0285] Similarly, the central angle opposite to the adsorption region 112 is specifically: the plane perpendicular to the axis of the winding body 1 is the projection plane, and the orthographic projection of the adsorption region 112 on the projection plane is an arc, and the central angle corresponding to the arc is the central angle opposite to the adsorption region 112.

[0286] It should be noted that the angle of the central angle opposite to the adsorption region 112 is positively correlated with the circumferential dimension of the adsorption region 112 on the winding body 1, and the axial dimension of the adsorption region 112 on the winding body 1 is the same as the axial dimension of the outer peripheral surface 11 on the winding body 1; therefore, it can be seen that the angle of the central angle opposite to the adsorption region 112 is positively correlated with the area of ​​the adsorption region 112.

[0287] In the above technical solution, by limiting the ratio of the central angle opposite to the starting area 111 to the central angle opposite to the adsorption area 112, the starting area 111 and the adsorption area 112 can be reasonably distributed on the outer peripheral surface 11 of the winding body 1, so that both the starting area 111 and the adsorption area 112 have suitable areas to meet the needs of winding different types of electrode components, and the diaphragm 2 of each electrode component can be effectively and stably adsorbed and fixed. At the same time, the reasonable distribution of the starting area 111 and the adsorption area 112 can reduce the processing of unnecessary adsorption holes and negative pressure chambers 12, and can reduce the energy consumption of negative pressure.

[0288] Of course, the ratio of the central angle opposite to the starting zone 111 to the central angle opposite to the adsorption zone 112 can be less than 1.2, for example, α / β=1; similarly, the ratio of the central angle opposite to the starting zone 111 to the central angle opposite to the adsorption zone 112 can be greater than 1.5, for example, α / β=1.8; the embodiments of this application do not limit this.

[0289] refer to Figures 15 to 17 , Figure 15 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 30°; Figure 16 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 60°; Figure 17 This is a right-side view of a first type of winding needle structure provided according to some embodiments of this application, wherein the central angle α opposite to the starting area is 160°.

[0290] In some embodiments, such as Figures 15 to 17 As shown, the central angle subtended by the starting area 111 is α, which satisfies: 30°≤α≤160°. For example, α can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, etc.

[0291] It should be understood that by limiting α to be greater than or equal to 30°, the central angle opposite to the starting area 111 is not too small, and thus the area of ​​the starting area 111 is not too small, so as to provide a starting area 111 with a sufficiently large area to support and adsorb the starting position 21 of the diaphragm 2.

[0292] Accordingly, by limiting α to less than or equal to 160°, the central angle opposite to the starting area 111 will not be too large, thereby preventing the area of ​​the starting area 111 from being too large, and thus preventing an increase in the energy consumption of the negative pressure due to the increase in the number of first adsorption holes 11111 in the starting area 111 which is too large.

[0293] In the above technical solution, by limiting the angular range of the central angle opposite to the starting area 111, the starting area 111 can have a suitable area, which can effectively support the starting position 21 of the diaphragm 2 and make the energy consumption of the negative pressure more reasonable.

[0294] refer to Figures 18 to 21 , Figure 18 This is a structural schematic diagram of a first layout of a negative pressure cavity according to some embodiments of this application; Figure 19 This is a structural schematic diagram of a second layout of the negative pressure chamber according to some embodiments of this application; Figure 20 This is a structural schematic diagram of a third layout of the negative pressure chamber according to some embodiments of this application; Figure 21 This is a structural schematic diagram of a fourth layout of a negative pressure chamber according to some embodiments of this application.

[0295] In some embodiments, the negative pressure chamber 12 can have various layout configurations, as follows:

[0296] The first type, such as Figure 18 As shown, each of the starting zone 111 and each adsorption zone 112 is equipped with a negative pressure chamber 12, and all the negative pressure chambers 12 are separated from each other.

[0297] Based on the first layout of the negative pressure chamber 12, the adsorption force of the starting area 111 and each adsorption area 112 can be individually adjusted by adjusting the negative pressure within the negative pressure chamber 12. This ensures that the starting area 111 and each adsorption area 112 have suitable adsorption forces, enabling better adsorption and fixation of the diaphragm 2, thereby meeting the winding requirements of different types of electrode assemblies. Simultaneously, according to the winding process requirements, the negative pressure within the negative pressure chamber 12 can be controlled to disable the adsorption function of the starting area 111 or some adsorption areas 112, or to disable the adsorption function in advance during the winding process, thereby reducing the energy consumption of the negative pressure. For example, for starting the winding of a diaphragm 2 with low tension, only the adsorption function of the starting area 111 and the previous one or a few adsorption areas 112 can be activated, while the adsorption function of the remaining adsorption areas 112 can be disabled. Alternatively, for starting the winding of a diaphragm 2 with low tension, the adsorption function of the starting area 111 can be disabled, and the winding of the diaphragm 2 can begin from the adsorption area 112 adjacent to the starting area 111.

[0298] The second type, such as Figure 19 As shown, the starting zone 111 and all adsorption zones 112 share a single negative pressure chamber 12.

[0299] The second layout based on the negative pressure chamber 12 allows the adsorption force of the starting zone 111 and each adsorption zone 112 to be related only to the total cross-sectional area of ​​the adsorption pores in each zone. Only a preset negative pressure value needs to be provided, simplifying the control operation of changing the adsorption force by adjusting the negative pressure output and reducing the system's control complexity. Furthermore, since the negative pressure output is gradual, multiple adjustments to the negative pressure to change the adsorption force in each zone would affect the stability of the negative pressure output, potentially causing the adsorption force of the starting zone 111 and each adsorption zone 112 to deviate from the expected value. Additionally, this layout simplifies the processing of the negative pressure chamber 12, reducing production difficulty and cost.

[0300] The third type, such as Figure 20 As shown, at least two adsorption zones 112 are distributed on the outer peripheral surface 11, and the starting zone 111 is equipped with an independent negative pressure chamber 12. At least two of the adsorption zones 112 share a negative pressure chamber 12.

[0301] In a third layout based on the negative pressure chamber 12, a separate negative pressure chamber 12 is configured for the winding zone 111. This allows for independent control of the negative pressure supplied to the winding zone 111, thereby altering its adsorption force. This enables the adsorption force of the winding zone 111 to quickly switch between winding low-tension diaphragm 2 and high-tension diaphragm 2, meeting the winding requirements of different types of electrode assemblies. Furthermore, at least two of all adsorption zones 112 share a single negative pressure chamber 12, reducing the number of negative pressure chambers 12 and simplifying their processing, thus lowering production difficulty and cost.

[0302] The fourth type, such as Figure 21 As shown, at least two adsorption zones 112 are distributed on the outer peripheral surface 11, and the starting zone 111 and part of the adsorption zone 112 share a negative pressure cavity 12.

[0303] Based on the fourth layout of the negative pressure chamber 12, the number of negative pressure chambers 12 can be reduced, and the processing of the negative pressure chambers 12 can be simplified, thereby reducing production difficulty and cost. It should be understood that, apart from the portion of the adsorption area 112 that shares a negative pressure chamber 12 with the starting area 111, the remaining adsorption areas 112 can each be configured with a separate negative pressure chamber 12, and the remaining adsorption areas 112 can also share a negative pressure chamber 12 with adjacent adsorption areas 112, etc., there are no restrictions in this regard.

[0304] In the above technical solution, by setting different negative pressure chambers 12, negative pressure can be reasonably distributed to the starting area 111 and the adsorption area 112 according to the needs, so that the starting area 111 and the adsorption area 112 can both receive a continuous and stable negative pressure supply.

[0305] In some embodiments, the absolute value of the negative pressure in the negative pressure chamber 12 communicating with the first adsorption hole 11111 is greater than or equal to the absolute value of the negative pressure in the negative pressure chamber 12 communicating with the second adsorption hole 11211. That is, the absolute value of the negative pressure supplied to the winding zone 111 is greater than or equal to the absolute value of the negative pressure supplied to the adsorption zone 112.

[0306] Optionally, the absolute value of the negative pressure in the negative pressure chamber 12 connected to the first adsorption hole 11111 is between 20 kPa and 100 kPa; for example, it can be 20 kPa, 30 kPa, 40 kPa, 50 kPa, 60 kPa, 70 kPa, 80 kPa, 90 kPa, or 100 kPa.

[0307] Optionally, the absolute value of the negative pressure in the negative pressure chamber 12 connected to the second adsorption hole 11211 is between 10 kPa and 100 kPa; for example, it can be 10 kPa, 20 kPa, 30 kPa, 40 kPa, 50 kPa, 60 kPa, 70 kPa, 80 kPa, 90 kPa, or 100 kPa.

[0308] It should be understood that, since the magnitude of the adsorption force at the adsorption pore is positively correlated with the cross-sectional area of ​​the adsorption pore and the absolute value of the negative pressure, and since the total cross-sectional area of ​​the adsorption pores in the starting zone 111 is greater than the total cross-sectional area of ​​the adsorption pores in any adsorption zone 112, by setting the absolute value of the negative pressure provided to the first adsorption pore 11111 to be greater than or equal to the absolute value of the negative pressure provided to the second adsorption pore 11211, the sum of the adsorption forces at the adsorption pores in the starting zone 111 can be greater than the sum of the adsorption forces at the adsorption pores in any adsorption zone 112.

[0309] In the above technical solution, by setting the absolute value of the negative pressure supplied to the first adsorption hole 11111 to be greater than or equal to the absolute value of the negative pressure supplied to the second adsorption hole 11211, a larger adsorption force can be distributed to the winding area 111, so that the winding position 21 of the diaphragm 2 can be stably attached to the winding area 111, thereby improving the problem that the diaphragm 2 is prone to slipping and wrinkling during the electrode assembly manufacturing process.

[0310] refer to Figures 22 to 29 , Figure 22 This is a three-dimensional structural schematic diagram of a first-angle coiled needle structure provided according to some embodiments of the present application, wherein a cutting groove structure is shown. Figure 23 This is a schematic diagram of the structure for achieving diaphragm cutting by cooperating the winding body and the roller body according to some embodiments of this application; Figure 24 This is a structural schematic diagram of a first layout of the cutting slot according to some embodiments of this application; Figure 25 This is a structural schematic diagram of a second layout of the cutting slot according to some embodiments of this application; Figure 26 This is a structural schematic diagram of a third layout of the cutting slot according to some embodiments of this application; Figure 27 This is a schematic diagram of a cut-off groove with an arc-shaped cross-section according to some embodiments of this application; Figure 28 This is a schematic diagram of a rectangular cross-sectional shape of a cutting groove according to some embodiments of this application; Figure 29 This is a schematic diagram of a V-shaped cross-sectional groove provided according to some embodiments of this application.

[0311] In some embodiments, such as Figure 22 and Figure 23 As shown, a cutting groove 13 is recessed on the outer peripheral surface 11 and extends along the axial direction of the winding body 1. The cutting groove 13 is configured to accommodate the cutting member 41 so that the cutting member 41 can complete the cutting of the diaphragm 2 within the cutting groove 13.

[0312] It should be noted that, as Figure 23 As shown, the cutting element 41 can be disposed on the rotatable roller body 4, and the cutting element 41 can extend along the axial direction of the roller body 4 and be arranged on the outer periphery of the roller body 4. When it is necessary to cut the diaphragm 2, the roller body 4 can approach the winding body 1 and abut against the diaphragm 2. The roller body 4 can rotate synchronously with the winding body 1, and during the rotation, the cutting element 41 abuts against the side of the diaphragm 2 away from the winding body 1. When the cutting element 41 rotates into the cutting groove 13, the diaphragm 2 can be cut.

[0313] Optionally, the cutting element 41 can be configured as a blade or as a heating wire or other structure capable of cutting the diaphragm 2.

[0314] In the above technical solution, by setting a cutting groove 13 on the outer peripheral surface 11 of the winding body 1 and cooperating with the cutting component 41, the diaphragm 2 can be cut without stopping the machine, which can greatly improve production efficiency.

[0315] Furthermore, such as Figure 24 As shown, the outer peripheral edge of the winding area 111 includes a first edge 1112 and a second edge 1113 arranged opposite to each other along the circumferential direction of the winding body 1. The first edge 1112 is closer to the winding end 22 of the diaphragm 2 adsorbed in the winding area 111 than the second edge 1113. Along the circumferential direction of the winding body 1, a cutting groove 13 is provided on the side of the winding area 111 close to the first edge 1112.

[0316] The settings for the first edge 1112 and the second edge 1113 can be referred to the embodiments described above, and will not be repeated here.

[0317] It should be noted that in the winding process of the electrode assembly, after the previous electrode assembly is wound, the diaphragm 2 needs to be cut in the cutting slot 13. After the diaphragm 2 is cut, part of it forms the closing diaphragm 2 of the previous electrode assembly, and the other part forms the starting diaphragm 2 of the next electrode assembly.

[0318] In the above technical solution, by setting the cutting groove 13 on the side of the starting area 111 close to the first edge 1112, and after cutting the diaphragm 2 between the two electrode assemblies, the starting diaphragm 2 of the next electrode assembly can be aligned with the starting area 111 and the next electrode assembly can be started to be wound.

[0319] Furthermore, such as Figure 25 As shown, there are multiple cutting slots 13; along the circumference of the winding body 1, some cutting slots 13 are disposed on the side of the starting area 111 near the second edge 1113; and / or, some cutting slots 13 are disposed between two adjacent adsorption areas 112.

[0320] It should be understood that, based on the fact that the adsorption force of the winding area 111 and at least part of the adsorption area 112 in the above embodiment can be adjusted independently, and by providing a cutting groove 13 on the side of the winding area 111 near the second edge 1113, the diaphragm 2 between the previous electrode assembly and the next electrode assembly can be cut through the cutting groove 13, so that the winding diaphragm 2 of the next electrode assembly corresponds to the adsorption area 112 adjacent to the winding area 111, and the winding of the diaphragm 2 can start from the adsorption area 112. For example, for winding the diaphragm 2 with low tension, the adsorption function of the winding area 111 can be turned off, and the cutting groove 13 near the second edge 1113 can be provided to complete the cutting of the diaphragm 2 between the previous electrode assembly and the next electrode assembly, so that the next electrode assembly can start winding from the adsorption area 112 adjacent to the winding area 111.

[0321] Similarly, a cutting groove 13 is provided between two adjacent adsorption zones 112, which can be used to cut the diaphragm 2 between the previous electrode assembly and the next electrode assembly according to the design requirements, and can be used to start winding the next electrode assembly from the corresponding adsorption zone 112.

[0322] In the above technical solution, by setting the cutting groove 13 on the side of the starting area 111 near the second edge 1113 or between two adjacent adsorption areas 112, the starting of the next electrode assembly can be started from any adsorption area 112, which can meet the winding requirements of different types of electrode assemblies. Furthermore, this structural design is beneficial to reducing the energy consumption of negative pressure.

[0323] Furthermore, such as Figure 26 As shown, the winding body 1 is divided into two half-winding sections 15, which are arranged symmetrically about the axis of the winding body 1. There are two cutting slots 13, which are arranged opposite each other on the two half-winding sections 15 along the radial direction of the winding body 1.

[0324] In the above technical solution, the design of two cutting slots 13 is adopted, and the two cutting slots 13 are respectively arranged on the two half-winding parts 15, which helps the winding body 1 to maintain dynamic balance when rotating.

[0325] Furthermore, such as Figures 27 to 29 As shown, the cross-sectional shape of the cut-off groove 13 includes, but is not limited to, arc, rectangle, and V-shape.

[0326] The cross-sectional shape of the cutting groove 13 refers to the shape of the cross section of the cutting groove 13 cut by a plane perpendicular to the axial direction of the winding body 1.

[0327] For example, such as Figure 27 As shown, the cross-sectional shape of the cutting groove 13 is arc-shaped, and the radius of the arc can be between 3 mm and 13 mm; for example, the radius of the arc can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, etc. The central angle subtended by the arc can be between 100° and 120°; for example, the central angle subtended by the arc can be 100°, 105°, 110°, 115°, 120°, etc.

[0328] For example, such as Figure 28As shown, the cross-sectional shape of the cutting groove 13 is rectangular, and the depth of the rectangle can range from 1 mm to 5 mm; for example, the depth of the rectangle can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. The width of the rectangle can range from 5 mm to 20 mm; for example, the width of the rectangle can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0329] For example, such as Figure 29 As shown, the cross-sectional shape of the cutting groove 13 is V-shaped, and the included angle of the V-shape can be between 90° and 135°; for example, the central angle subtended by the arc can be 90°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, etc. The depth of the V-shape can be between 1 mm and 5 mm; for example, the depth of the V-shape can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0330] In the above technical solution, the cutting groove 13 has a variety of cross-sectional shapes, which can be arranged according to requirements to adapt to different types of cutting parts 41, so that the cutting parts 41 can smoothly enter the cutting groove 13 and have a cutting angle suitable for cutting the diaphragm 2, which helps to achieve non-deceleration cutting of the diaphragm 2 and improve production efficiency.

[0331] refer to Figure 30 and Figure 31 , Figure 30 This is a three-dimensional structural schematic diagram of a first-angle coiling structure provided according to some embodiments of the present application, wherein a slot structure is shown; Figure 31 This is a right-side view of a first type of coiled needle structure provided according to some embodiments of this application, showing one layout of the slots.

[0332] In some embodiments, such as Figure 30 As shown, a slot 14 is recessed on the outer peripheral surface 11, and the slot 14 extends along the axial direction of the winding body 1; there are two slots 14, and the two slots 14 are arranged opposite each other along the radial direction of the winding body 1; the two slots 14 are configured to allow two clamping pins to be inserted respectively, so that the two clamping pins can remove the electrode assembly wound on the winding body 1.

[0333] Optionally, the cross-sectional shape of the slot 14 can be U-shaped, rectangular, etc. Here, the cross-sectional shape of the slot 14 refers to the shape of the cross-section of the slot 14 taken by a plane perpendicular to the axial direction of the winding body 1.

[0334] Alternatively, the cross-sectional shapes of the two slots 14 may be different.

[0335] In the above technical solution, by setting two slots 14, two clamping pins can be used to facilitate the removal of the electrode assembly from the winding body 1; in addition, the design of two slots 14 and the arrangement of the two slots 14 opposite to each other on the winding body 1 helps the winding body 1 maintain dynamic balance when rotating.

[0336] Furthermore, such as Figure 31 As shown, the winding body 1 is divided into two half-winding sections 15. The two half-winding sections 15 are arranged symmetrically about the axis of the winding body 1, and the two half-winding sections 15 can move closer or further away from each other. Two slots 14 are respectively disposed between the two half-winding sections 15.

[0337] It should be understood that since the slot 14 is disposed between the two half-wound portions 15, a portion of the slot 14 is formed on one half-wound portion 15 and a portion is formed on the other half-wound portion 15; thus, the space of the slot 14 can be changed when the two half-wound portions 15 are close to or far from each other.

[0338] Furthermore, a gap 151 is usually formed between the two half-wound portions 15, and a portion of the gap 151 can also form part of the slot 14, that is, the machining of the slot 14 can be relatively reduced on the two half-wound portions 15.

[0339] In the above technical solution, by adjusting the distance between the two semi-wound portions 15, the space of the slot 14 can be changed to accommodate a wider range of sizes of clamping pins. At the same time, reducing the machining of the slot 14 on the two semi-wound portions 15 not only facilitates low-cost machining of the slot 14 but also increases the structural strength of the two semi-wound portions 15.

[0340] Secondly, embodiments of this application also provide a winding device, including the winding needle structure provided in any of the embodiments of the first aspect.

[0341] The winding equipment may include a composite mechanism, an unwinding mechanism, and a winding needle structure. The unwinding mechanism is used to unwind the positive electrode sheet, the negative electrode sheet, and two layers of separator. The composite mechanism is used to press the positive electrode sheet, the negative electrode sheet, and the two layers of separator together to form a composite sheet. The winding needle structure is located on the discharge side of the composite mechanism and is used to wind the composite sheet to form an electrode assembly.

[0342] In the above technical solution, the winding equipment, by adopting the winding needle structure in the first aspect, can effectively improve the product quality and yield of the electrode assembly, thereby improving the overall performance and reliability of the battery.

[0343] The needle winding structure provided in this application includes a winding body 1, which has a negative pressure cavity 12 and an outer peripheral surface 11. The negative pressure cavity 12 can provide negative pressure for adsorbing the diaphragm 2, and the outer peripheral surface 11 is used to support the diaphragm 2 so that the diaphragm 2 can be wound up and the electrode assembly can be wound on the winding body 1. The outer peripheral surface 11 is provided with a winding area 111, at least one adsorption area 112, and a non-adsorption area 113. The winding area 111 is used to adsorb the winding position 21 of the diaphragm 2. The adsorption area 112 is used to adsorb other areas of the diaphragm 2 and / or the electrode 3 superimposed on the diaphragm 2. The non-adsorption area 113 is mainly used for the support and adhesion of the diaphragm 2 and has no adsorption function on the diaphragm 2. There may be two adsorption areas 112, namely the first adsorption area 112a and the second adsorption area 112b. The four areas of the winding area 111, the first adsorption area 112a, the second adsorption area 112b, and the non-adsorption area 113 are arranged sequentially along the circumference of the winding body 1. Adsorption holes communicating with the negative pressure chamber 12 are provided in the starting area 111, the first adsorption area 112a, and the second adsorption area 112b. These adsorption holes can be one or more of the following: rectangular, strip-shaped, circular, or elliptical. The total cross-sectional area of ​​the adsorption holes in each of the starting area 111, the first adsorption area 112a, and the second adsorption area 112b decreases progressively, allowing the total adsorption force in each area to decrease gradually in a stepped manner. The central angle subtended by the starting area 111 ranges from 30° to 160°. The ratio of the central angle subtended by the starting area 111 to the central angle subtended by the first adsorption area 112a ranges from 1.2 to 1.5, and the ratio of the central angle subtended by the starting area 111 to the central angle subtended by the second adsorption area 112b ranges from 1.2 to 1.5. The porosity of the winding zone 111 is greater than that of any of the adsorption zones 112. The porosity of the winding zone 111 ranges from 5% to 60%, while the porosity of the first adsorption zone 112a and the second adsorption zone 112b both range from 2% to 50%. Taking the adsorption holes as circular holes as an example, the diameter of a single adsorption hole in the winding zone 111, the first adsorption zone 112a, and the second adsorption zone 112b ranges from 0.5 mm to 5 mm. The absolute value of the negative pressure output to the winding zone 111 ranges from 20 kPa to 100 kPa, and the absolute value of the negative pressure output to the first adsorption zone 112a and the second adsorption zone 112b both ranges from 10 kPa to 100 kPa. A cutting groove 13 is recessed on the outer peripheral surface 11 and extends along the axial direction of the winding body 1. The cutting groove 13 can cooperate with the cutting member 41 to cut the diaphragm 2. The number of cutting slots 13 can be two, and the two cutting slots 13 are arranged opposite each other along the radial direction of the winding body 1. The cross-sectional shape of the cutting slots 13 includes, but is not limited to, arc shape, rectangle, U shape, and V shape.Two slots 14 are recessed on the outer peripheral surface 11 and arranged radially opposite to each other along the winding body 1. Both slots 14 extend along the axial direction of the winding body 1. The two slots 14 allow two clamping pins to be inserted, so that the two clamping pins can remove the electrode assembly wound on the winding body 1.

[0344] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0345] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. This application is not limited to the specific embodiments applied herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winder structure for winding a stack of separators and pole pieces into an electrode assembly, characterized by, The winding needle structure comprises: a winding body having a negative pressure cavity and an outer peripheral surface; a winding start area and at least one adsorption area are distributed on the outer peripheral surface along the circumferential direction of the winding body; a plurality of first adsorption holes are arranged in the winding start area, the plurality of first adsorption holes are communicated with the negative pressure cavity, so that adsorption force can be generated at the plurality of first adsorption holes, and the winding start position of the diaphragm can be adsorbed in the winding start area, and the winding start area is only used for adsorbing the winding start position of the diaphragm; a plurality of second adsorption holes are arranged in the adsorption area, the plurality of second adsorption holes are communicated with the negative pressure cavity, so that adsorption force can be generated at the plurality of second adsorption holes, and at least one of the diaphragm and the laminated layer, which is a laminated structure of the diaphragm and the pole piece, can be adsorbed in the adsorption area; wherein the sum of the adsorption forces of all the first adsorption holes in the winding start area is the total adsorption force of the winding start area, the sum of the adsorption forces of all the second adsorption holes in the same adsorption area is the total adsorption force of the adsorption area, and the total adsorption force of the winding start area is greater than the total adsorption force of the adsorption area; the sum of the cross-sectional areas of all the first adsorption holes in the winding start area is a first total cross-sectional area, and the sum of the cross-sectional areas of all the second adsorption holes in the same adsorption area is a second total cross-sectional area, and the first total cross-sectional area is greater than the second total cross-sectional area; the outer peripheral edge of the winding start area comprises a first edge, a second edge and two winding side edges; the first edge and the second edge are oppositely arranged along the circumferential direction of the winding body, and the first edge is closer to the winding end of the diaphragm adsorbed in the winding start area than the second edge; the two winding side edges are oppositely arranged along the axial direction of the winding body, and the two winding side edges are respectively connected between the first edge and the second edge; at least part of the first adsorption holes are strip-shaped holes, and at least part of the strip-shaped holes are distributed on the first edge and the two winding side edges; the length extension direction of the strip-shaped holes distributed on the first edge is inconsistent with the circumferential direction of the winding body; and / or, the length extension direction of the strip-shaped holes distributed on the two winding side edges is inconsistent with the axial direction of the winding body.

2. The winding needle structure according to claim 1, wherein: the outer peripheral surface is distributed with at least two adsorption areas; all the total adsorption forces of the adsorption areas show a decreasing trend from the winding start area in the direction opposite to the rotation direction of the winding body.

3. The winding needle structure according to claim 1, wherein: the outer peripheral surface is distributed with at least two adsorption areas; all the second total cross-sectional areas show a decreasing trend from the winding start area in the direction opposite to the rotation direction of the winding body.

4. The winding needle structure according to claim 1, wherein: the ratio of the sum of the cross-sectional areas of all the first adsorption holes in the winding start area to the area of the winding start area is G, and the G satisfies: 0.05≤G≤0.

6.

5. The winding needle structure according to claim 4, wherein: the cross-sectional area of the first adsorption hole is greater than or equal to 0.19 square millimeters and less than or equal to 20 square millimeters.

6. The winding needle structure according to claim 1, wherein a ratio of a sum of cross-sectional areas of all the second suction holes in the same suction area to an area of the suction area is H, and the H satisfies 0.02≤H≤0.

5.

7. The winding needle structure according to claim 6, wherein the cross-sectional area of the second suction hole is greater than or equal to 0.19 mm2 and less than or equal to 20 mm2.

8. The winding needle structure according to claim 1, wherein the cross-sectional area of the first suction hole in the winding area presents a decreasing trend in a direction opposite to a rotation direction of the winding body; and / or the cross-sectional area of the second suction hole in at least one of the suction areas presents a decreasing trend in the direction opposite to the rotation direction of the winding body.

9. The winding needle structure according to claim 1, wherein the negative pressure cavity is provided with a connecting end communicating with a vacuum device on one side of the winding body in an axial direction of the winding body; the cross-sectional area of the first suction hole in the winding area presents an increasing trend in the axial direction of the winding body, and the cross-sectional area of the first suction hole close to the connecting end is smaller than that of the first suction hole far from the connecting end in the axial direction of the winding body; and / or the cross-sectional area of the second suction hole in at least one of the suction areas presents an increasing trend in the axial direction of the winding body, and the cross-sectional area of the second suction hole close to the connecting end is smaller than that of the second suction hole far from the connecting end in the axial direction of the winding body.

10. The winding needle structure according to claim 1, wherein any two adjacent first suction holes are arranged in a circumferential direction of the winding body with a displacement; and / or any two adjacent second suction holes are arranged in the circumferential direction of the winding body with a displacement.

11. The winding needle structure according to claim 1, wherein an outer peripheral edge of the suction area comprises two suction side edges arranged opposite to each other in the axial direction of the winding body; and at least part of the second suction holes are strip-shaped holes, and at least part of the strip-shaped holes are distributed on the two suction side edges.

12. The winding needle structure according to claim 11, wherein a length extension direction of the strip-shaped holes distributed on the two suction side edges is inconsistent with the axial direction of the winding body.

13. The winding needle structure according to claim 1, wherein a central angle of the winding area is a, and a central angle of the suction area is β, and the a / β satisfies 1.2≤a / β≤1.

5.

14. The winding needle structure according to claim 1, wherein the central angle of the winding area is a, and the a satisfies 30°≤a≤160°.

15. The winding needle structure according to any one of claims 1-14, wherein the negative pressure cavity satisfies one of the following conditions: the winding area and each of the suction areas are respectively provided with one negative pressure cavity, and all the negative pressure cavities are arranged separately from each other; the winding area and all the suction areas share one negative pressure cavity. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At least two of the adsorption zones are distributed on the outer peripheral surface, and the roll-starting zone is configured with a separate negative pressure cavity, and at least two of the adsorption zones share one negative pressure cavity. At least two of the adsorption zones are distributed on the outer peripheral surface, and the roll-starting zone and part of the adsorption zones share one negative pressure cavity.

16. The roll needle structure according to any one of claims 1-14, wherein The absolute value of the negative pressure in the negative pressure cavity communicating with the first adsorption hole is greater than or equal to the absolute value of the negative pressure in the negative pressure cavity communicating with the second adsorption hole.

17. The roll needle structure according to any one of claims 1-14, wherein The outer peripheral surface is recessed with a cutting position slot, and the cutting position slot extends along the axial direction of the roll body; The cutting position slot is configured to accommodate a cutting member, so that the cutting member can cut the diaphragm in the cutting position slot.

18. The roll needle structure according to claim 17, wherein The outer peripheral edge of the roll-starting zone includes a first edge and a second edge oppositely arranged along the circumferential direction of the roll body, and the first edge is closer to the roll-starting end of the diaphragm adsorbed on the roll-starting zone than the second edge; Along the circumferential direction of the roll body, the cutting position slot is arranged on one side of the roll-starting zone close to the first edge.

19. The roll needle structure according to claim 18, wherein The number of cutting position slots is multiple; Along the circumferential direction of the roll body, part of the cutting position slots are arranged on one side of the roll-starting zone close to the second edge; and / or Part of the cutting position slots are arranged between two adjacent adsorption zones.

20. The roll needle structure according to claim 17, wherein The roll body is divided into two half roll winding parts, and the two half roll winding parts are centrally symmetrically arranged about the axis of the roll body; The number of cutting position slots is two, and the two cutting position slots are oppositely arranged on the two half roll winding parts along the radial direction of the roll body.

21. The roll needle structure according to any one of claims 1-14, wherein The outer peripheral surface is recessed with a slot, and the slot extends along the axial direction of the roll body; The number of slots is two, and the two slots are oppositely arranged along the radial direction of the roll body; The two slots are configured to respectively accommodate two clamp needles, so that the two clamp needles can remove the electrode assembly wound on the roll body.

22. The roll needle structure according to claim 21, wherein The roll body is divided into two half roll winding parts, and the two half roll winding parts are centrally symmetrically arranged about the axis of the roll body, and the two half roll winding parts can approach or move away from each other; The two slots are respectively arranged between the two half roll winding parts.

23. A winding apparatus characterized by comprising: The roll needle structure according to any one of claims 1-22.

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