Winding needle structure and winding device

Abstract

The application discloses a winding needle structure and a winding device. The winding needle structure comprises a winding needle base, which is arranged rotatable in an axial direction of the winding needle structure; a first needle group, which is connected to one side of the winding needle base in the axial direction and can rotate following the rotation of the winding needle base; a second needle group, which is arranged on one side of the first needle group in a radial direction of the winding needle structure; a connecting piece, which is connected between the first needle group and the second needle group, and the second needle group is arranged movable in the radial direction relative to the first needle group through the connecting piece; and a piezoelectric adjusting piece, which is arranged between the first needle group and the second needle group and is arranged deformable along the radial direction, so as to adjust the distance between the first needle group and the second needle group through the deformation of the piezoelectric adjusting piece. The winding needle structure provided by the embodiment of the application can not only adjust the radial size, but also has simple structure, is convenient to use and is not prone to generate metal particles.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a winding needle structure and a winding device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the battery production process, the winding needle structure of the winding device is used to wind the separator and the pole piece to form the battery cell. The radial size of the winding needle structure of the winding needle structure is related to the alignment of the pole tab and the size of the battery cell, so the radial size of the winding needle structure directly affects the quality of the battery cell. However, the radial size of the winding needle structure of the existing winding needle structure is difficult to adjust. SUMMARY

[0004] In view of the above problems, the present application provides a winding needle structure and a winding device, which can alleviate the problem that the radial size of the winding needle structure is difficult to adjust.

[0005] In a first aspect, the present application provides a winding needle structure, comprising: a winding needle seat, which is rotatable in the axial direction of the winding needle structure; a first needle group, which is connected to one side of the winding needle seat in the axial direction and can rotate with the rotation of the winding needle seat; a second needle group, which is arranged on one side of the first needle group in the radial direction of the winding needle structure; a connecting piece, which is connected between the first needle group and the second needle group, and the second needle group is movably arranged relative to the first needle group in the radial direction through the connecting piece; and a piezoelectric adjusting part, which is arranged between the first needle group and the second needle group, and the piezoelectric adjusting part is deformably arranged along the radial direction to adjust the distance between the first needle group and the second needle group through the deformation of the piezoelectric adjusting part.

[0006] In the technical scheme of the embodiment of the application, the winding needle structure comprises a winding needle base, a first needle group, a second needle group, a connecting piece and a piezoelectric adjusting piece. The winding needle base is rotatably arranged, so that the winding needle base can drive the first needle group and the second needle group to rotate, and then the pole piece wound on the second needle group can be wound to form the battery cell. The first needle group and the second needle group are connected through the connecting piece, and the second needle group is movably arranged in the radial direction relative to the first needle group through the connecting piece, so that the radial size of the outer contour of the second needle group can be changed, and then the position of the pole piece wound on the second needle group can be changed. The piezoelectric adjusting piece is used to adjust the distance between the first needle group and the second needle group by deformation. Through the deformation adjustment of the piezoelectric adjusting piece, on the one hand, the structure is simple and convenient to operate, and on the other hand, the friction between the first needle group, the second needle group and the piezoelectric adjusting piece can be improved, so that the metal particles caused by the friction are prevented from falling on the pole piece and affecting the performance of the battery cell. Therefore, the winding needle structure provided by the embodiment of the application can not only adjust the radial size, but also has the advantages of simple structure, convenient use and difficulty in generating metal particles.

[0007] In some embodiments, the first needle group comprises two or more inner needles, the two or more inner needles are distributed around an axis extending in the axial direction, and the winding needle base is rotatably arranged around the axis; the second needle group comprises two or more outer needles, each outer needle is arranged on the side of each inner needle away from the axis, and each outer needle is connected with each inner needle through each connecting piece, and the piezoelectric adjusting piece is arranged between each outer needle and each inner needle. By arranging the plurality of inner needles and the outer needles corresponding to each inner needle, the radial adjustment size can be increased, and the radial size of different positions of the winding needle structure can be adjusted to adjust the shape of the winding needle structure.

[0008] In some embodiments, the side of the first needle group facing the second needle group has a first surface; the side of the second needle group facing the first needle group has a second surface; at least one of the first surface and the second surface is recessed to form a containing cavity, and at least part of the piezoelectric adjusting piece is arranged in the containing cavity. By arranging the containing cavity, the piezoelectric adjusting piece can be provided with a limit, the shaking of the piezoelectric adjusting piece between the first needle group and the second needle group is reduced, the friction between the first needle group, the second needle group and the piezoelectric adjusting piece is further reduced, and the generation of metal particles is avoided.

[0009] In some embodiments, the second surface is recessed to form a containing cavity; the first needle group comprises a mounting hole penetrating in the radial direction and a mounting boss arranged in the mounting hole, the mounting hole is communicated with the containing cavity, the mounting boss is protruded from the inner surface of the first needle group facing the mounting hole, and the piezoelectric adjusting piece is arranged in the mounting boss. By arranging the mounting boss on the first needle group, the first needle group and the piezoelectric adjusting piece are abutted with each other through the mounting boss, and the fitting area of the first needle group and the piezoelectric adjusting piece can be reduced. On the one hand, the preparation process difficulty of the first needle group and the piezoelectric adjusting piece can be reduced, and on the other hand, the friction between the first needle group and the piezoelectric adjusting piece can be further improved, and the generation of metal particles is avoided.

[0010] In some embodiments, the second needle group has a locking hole in communication with the accommodating cavity, and the piezoelectric adjusting member is connected to the second needle group through the locking hole. The second needle group and the piezoelectric adjusting member can be locked to each other through the locking hole, the relative position stability of the second needle group and the piezoelectric adjusting member is improved, the mutual shaking of the second needle group and the piezoelectric adjusting member is improved, the friction between the second needle group and the piezoelectric adjusting member is improved, and metal particles are avoided.

[0011] In some embodiments, the first surface is recessed to form a first connecting hole; the second needle group has a second connecting hole penetrating in the radial direction and in communication with the first connecting hole; and the connecting member is arranged in the first connecting hole and the second connecting hole to connect the first needle group and the second needle group. The connecting member is arranged in the first connecting hole and the second connecting hole, which not only connects the first needle group and the second needle group, but also clamps the piezoelectric adjusting member between the first needle group and the second needle group.

[0012] In some embodiments, the connecting member includes a connecting rod for penetrating the first connecting hole and the second connecting hole, a stopper arranged on a side of the connecting rod away from the first needle group, and a reset member. The first connecting hole is a stepped hole and includes a recessed platform, the recessed platform is located on a side of the stopper facing the first surface, the reset member is stopped between the stopper and the recessed platform, and the reset member has a radial reset force. The reset force can provide a reset force to the first needle group and the second needle group, so that the relative position stability between the first needle group and the second needle group can be ensured before or after the second needle group moves relative to the first needle group in the radial direction by the piezoelectric adjusting member, the friction between the first needle group, the second needle group and the piezoelectric adjusting member is reduced, and metal particles are avoided.

[0013] In some embodiments, the winding needle structure further includes a barrier arranged between the piezoelectric adjusting member and the second needle group, and the piezoelectric adjusting member drives the second needle group to move in the radial direction through the barrier. The contact area between the barrier and the piezoelectric adjusting member, the contact area between the barrier and the second needle group are smaller than the contact area between the second needle group and the piezoelectric adjusting member, so that not only the preparation difficulty of the outer surface of the second needle group and the piezoelectric adjusting member is reduced, but also the friction between the second needle group and the piezoelectric adjusting member is improved, and metal particles are avoided.

[0014] In some embodiments, the winding needle structure further includes a distance sensor for acquiring the distance between the first needle group and the second needle group in the radial direction. The distance between the first needle group and the second needle group in the radial direction can be acquired by the distance sensor, and then the size of the outer contour of the second needle group and the winding size of the pole piece wound on the second needle group can be determined.

[0015] In some embodiments, the distance sensor includes an inductive sheet and a receiver, one of the inductive sheet and the receiver is arranged on the second needle group, and the other is arranged on the winding needle holder. The receiver receives the information of the inductive sheet, and then the size of the first needle group and the second needle group in the radial direction can be determined.

[0016] In some embodiments, the winding needle structure further comprises: a first connecting wire connected to the piezoelectric adjusting member; a second connecting wire for connecting an external electrical device; an electric sliding ring connecting the first connecting wire and the second connecting wire, so that the first connecting wire is rotatably arranged around the axis relative to the second connecting wire through the sliding ring structure. When the winding needle base rotates during winding of the pole piece, the first needle group and the second needle group arranged on the winding needle, and the piezoelectric adjusting member between the first needle group and the second needle group will rotate, causing the first connecting wire to rotate. By arranging the electric sliding ring, the first connecting wire can rotate relative to the second connecting wire, avoiding the inconvenience caused by the twisting of the second connecting wire, and also improving the service life of the first connecting wire and the second connecting wire.

[0017] In a second aspect, the application provides a winding device for winding a pole piece and a separator to form a battery cell, comprising: a detection component for detecting dislocation information of the pole piece; the winding needle structure in the above-mentioned embodiments; and a processing component in communication connection with the detection component and the piezoelectric adjusting component, and for controlling the deformation of the piezoelectric adjusting component according to the dislocation information.

[0018] In some embodiments, the detection component comprises: a first detection component for detecting dislocation information of the pole piece; and / or a second detection component for detecting thickness information of the pole piece and / or the separator, and confirming the dislocation information according to the thickness information.

[0019] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the scope of the application. Moreover, the same reference numerals in the attached drawings indicate the same or similar elements. In the drawings:

[0021] Figure 1 Structure schematic diagram of the winding device of some embodiments of the application;

[0022] Figure 2 Structure schematic diagram of the winding device of some other embodiments of the application;

[0023] Figure 3 Structure schematic diagram of the winding device of some other embodiments of the application;

[0024] Figure 4A perspective view of a winding needle structure according to some embodiments of the present application;

[0025] Figure 5 A top view of a winding needle structure according to some embodiments of the present application;

[0026] Figure 6 A perspective view of a winding needle structure according to some embodiments of the present application; Figure 5 A sectional view at A-A;

[0027] Figure 7 A perspective view of a winding needle structure according to some embodiments of the present application; Figure 6 An enlarged structural schematic view at I;

[0028] Figure 8 A perspective view of a winding needle structure according to some embodiments of the present application; Figure 5 A sectional view at B-B;

[0029] Figure 9 A perspective view of a winding needle structure according to some embodiments of the present application;

[0030] Figure 10 A top view of a winding needle structure according to some embodiments of the present application;

[0031] Figure 11 A perspective view of a winding needle structure according to some embodiments of the present application; Figure 10 A sectional view at C-C;

[0032] Figure 12 A perspective view of a winding needle structure according to some embodiments of the present application; Figure 11 An enlarged structural schematic view at II;

[0033] Figure 13 A structural schematic view of a motor slip ring of a winding needle structure according to some embodiments of the present application;

[0034] Figure 14 A side view of a winding needle structure according to some embodiments of the present application;

[0035] Figure 15 A sectional view at D-D. Figure 14

[0036] Reference signs in the detailed description of the embodiments are as follows:

[0037] Winding device 1000;

[0038] Winding needle structure 100, detection component 200, first detection part 210, second detection part 220, processing component 300; first adjusting roller 410, second adjusting roller 420, third adjusting roller 430, fourth adjusting roller 440;

[0039] Winding needle base 110;

[0040] ​First needle group 120, inner needle 120a, first surface 121, mounting hole 122, mounting boss 123, first connecting hole 124, inner surface 125,

[0041] Second needle group 130, outer needle 130a, second surface 131, locking hole 132, screw 133, second connecting hole 134, concave boss 134a, inner side surface 135,

[0042] Connecting piece 140, connecting rod 141, stop 142, reset piece 143,

[0043] Piezoelectric adjusting piece 150, piezoelectric crystal 151, mechanical amplification structure 152;

[0044] Accommodation cavity 160,

[0045] Barrier 170,

[0046] Distance sensor 180, sensing sheet 181, receiver 182,

[0047] First connecting wire 191, second connecting wire 192, electric slip ring 193;

[0048] First pole piece 11, second pole piece 12;

[0049] First diaphragm 21, second diaphragm 22. DETAILED DESCRIPTION

[0050] The embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0053] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of other embodiments. Those of ordinary skill in the art will recognize that an embodiment described herein can be incorporated in other embodiments with or without modifications.

[0054] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0055] In the description of the embodiments of the application, the term“a plurality of” means more than two (including two), and similarly, “a plurality of groups” means more than two groups (including two groups), and “a plurality of pieces” means more than two pieces (including two pieces).

[0056] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0057] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0058] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0059] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0060] During battery production, the winding mechanism's needles are used to wind the separator and electrode sheets to form a cell. The needle's radial dimensions are closely linked to the alignment of the electrode tabs and the cell's dimensions, directly impacting cell quality.

[0061] The inventors have discovered that the radial dimensions of existing winding needles are difficult to adjust. In some related technologies, even if some radial dimensions of winding needles can be adjusted, there are still some technical problems. For example, the adjustment mechanism of the radial dimensions of the winding needle structure in the related technology is usually to adjust the radial dimensions of the winding needle through simple mechanical contact movement. The mechanical movement accuracy is low, usually only ±0.01mm, and in order to achieve this accuracy, the parts of the winding needle structure need to be fine-machined, which will greatly increase the manufacturing cost of the winding needle structure. The production of some battery cells requires the radial dimension change accuracy of the winding needle to be ≥0.08mm. For thick cells, such as cells with 42 layers of wound pole pieces, the overall adjustment accuracy may be as high as 0.08mm*42=3.36mm. This makes it difficult for the radial dimension adjustment of the winding needle in the related technology to meet the use requirements.

[0062] Furthermore, the inventors discovered that because the radial dimension of the winding needle in the related art is changed through mechanical contact, mechanical friction occurs during this process. This inevitably generates metal particles. These metal particles can easily fall into the battery cell, potentially piercing the separator and causing a short circuit, thus compromising battery cell safety.

[0063] In order to solve the above technical problems, the applicant has discovered that the deformation of the piezoelectric component can be used to adjust the distance between the inner needle and the outer needle in the winding needle structure. The deformation of the piezoelectric component will improve the friction between the inner needle and the outer needle. The adjustment amount of the radial size change of the winding needle can also be increased by reasonably setting the deformation amount of the piezoelectric component.

[0064] Based on the above considerations, in order to solve the problem that the radial size of the winding needle is difficult to adjust, the inventor designs a winding needle structure. The winding needle structure is provided with a piezoelectric adjusting part between the first needle group (i.e. the inner needle) and the second needle group (i.e. the outer needle). The spacing between the first needle group and the second needle group is adjusted through the deformation of the piezoelectric adjusting part, and then the radial size of the winding needle is adjusted. The piezoelectric adjusting part may, for example, include a piezoelectric crystal. The spacing between the first needle group and the second needle group in the radial direction is directly adjusted through the deformation of the piezoelectric crystal.

[0065] The deformation of the piezoelectric crystal is controlled by the intensity of the electric field. Therefore, the deformation amount of the piezoelectric crystal can be controlled through the intensity of the electric field, and then the spacing between the first needle group and the second needle group can be controlled.

[0066] The present application adjusts the spacing between the first needle group and the second needle group through the deformation of the piezoelectric adjusting part, rather than through mechanical contact slip and other methods. On the one hand, it can avoid the generation of metal particles caused by friction. On the other hand, the adjustment amount of the radial size of the winding needle can be adjusted by appropriately adjusting the deformation amount of the piezoelectric adjusting part.

[0067] The winding needle structure disclosed in the embodiments of the present application can be used not only for preparing battery monomers, but also for preparing other components that are wound into a shape.

[0068] The winding device provided by the embodiments of the present application can be used not only for winding production of the battery cell, but also for winding production of other components.

[0069] The following embodiments are described by taking, for example, a winding needle structure and a winding device for preparing a battery cell as an example for the convenience of description.

[0070] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the winding device 1000 provided by some embodiments of the present application is shown.

[0071] As shown in Figure 1 , the winding device 1000 includes: a detection part 200 for detecting the dislocation information of the pole piece; a winding needle structure 100 for winding the pole piece; and a processing part 300 in communication connection with the detection part 200 and the winding needle structure 100, and used for controlling the radial size of the winding needle structure 100 according to the dislocation information.

[0072] Optionally, the pole piece of the battery cell includes a first pole piece 11 and a second pole piece 12, the separator of the battery cell includes a first separator 21 and a second separator 22, and the battery cell is wound into a shape by the first separator 21, the first pole piece 11, the second separator 22 and the second pole piece.

[0073] Please refer to Figure 2 , Figure 2A structural schematic diagram of the winding device 1000 is provided for other embodiments of the present application.

[0074] As shown in Figure 2 Optionally, the winding device 1000 comprises adjusting rollers for adjusting the tension of the pole piece or the diaphragm. Optionally, the adjusting rollers comprise a first adjusting roller 410 for adjusting the tension of the first diaphragm 21, a second adjusting roller 420 for adjusting the tension of the first pole piece 11, a third adjusting roller 430 for adjusting the tension of the second diaphragm 22, and a fourth adjusting roller 440 for adjusting the tension of the second pole piece 12. The number of the first adjusting roller 410, the second adjusting roller 420, the third adjusting roller 430, and the fourth adjusting roller 440 can be one or more. For example, the first adjusting roller 410 is one, the second adjusting roller 420 is two or three, the number of the third adjusting roller 430 is one, and the number of the fourth adjusting roller 440 is two or three.

[0075] During the use of the winding device 1000, the first diaphragm 21 is unwound from the first diaphragm 21 roll and wound on the winding needle structure 100 via the first adjusting roller 410, the first diaphragm 21 roll is used as the feed of the first diaphragm 21, and the first adjusting roller 410 is used to adjust the tension of the first diaphragm 21. Similarly, the first pole piece 11 is unwound from the first pole piece roll and wound on the winding needle structure 100 via the second adjusting roller 420, the second diaphragm 22 is unwound from the second diaphragm 22 roll and wound on the winding needle structure 100 via the third adjusting roller 430, and the second pole piece 12 is unwound from the second pole piece roll and wound on the winding needle structure 100 via the fourth adjusting roller 440.

[0076] The detection component 200 can be arranged in various ways, as shown in Figure 2 The detection component 200 comprises a first detection part 210, for example, for detecting the misalignment information of the pole piece. The number of the first detection part 210 can be one, and one first detection part 210 is used to obtain the misalignment information of the first pole piece 11 or the second pole piece 12. The number of the first detection part 210 can also be two, one of which is used to obtain the misalignment information of the first pole piece 11, and the other is used to obtain the misalignment information of the second pole piece 12.

[0077] The first detection part 210 is exemplified as two. When the first detection part 210 is two, the first detection part 210 can be arranged at multiple positions. Optionally, the first detection part 210 can be arranged near the second adjusting roller 420 or the fourth adjusting roller 440. For example, when the number of the second adjusting roller 420 is three, the first detection part 210 can be arranged between two adjacent second adjusting rollers 420. The position of the first pole piece 11 between two second adjusting rollers 420 is relatively stable, which facilitates the first detection part 210 to accurately acquire the misalignment information of the first pole piece 11. When the number of the third adjusting roller 430 is three, the first detection part 210 can be arranged between two adjacent third adjusting rollers 430. The position of the second pole piece 12 between two third adjusting rollers 430 is relatively stable, which facilitates the first detection part 210 to accurately acquire the misalignment information of the second pole piece 12. In addition, the first detection part 210 can be arranged near the first pole piece roll and the second pole piece roll to quickly acquire the misalignment information, which facilitates the processing component 300 to timely control the radial size of the needle structure 100 according to the misalignment information.

[0078] The first detection part 210 can be, for example, a photoelectric sensor, which acquires the misalignment information of the first pole piece 11 and / or the second pole piece 12.

[0079] Please refer to Figure 3 , Figure 3 The structure schematic diagram of the winding device 1000 provided by some other embodiments of the present application is shown.

[0080] As Figure 3 shown, in some other embodiments, the detection component 200 comprises a second detection part 220, which is used to detect the thickness information of the pole piece and / or the diaphragm and confirm the misalignment information according to the thickness information. The number of the second detection part 220 can be one or more. For example, the number of the second detection part 220 is four, and each second detection part 220 is used to detect the thickness information of the first diaphragm 21, the first pole piece 11, the second diaphragm 22 and the second pole piece 12. For example, when the second detection part 220 acquires the thickness variation amount of the first diaphragm 21 as Δd1, the thickness variation amount of the first pole piece 11 as Δd2, the thickness variation amount of the second diaphragm 22 as Δd3, and the thickness variation amount of the second pole piece 12 as Δd4. Then the thickness variation Δd wound on the needle structure 100 is Δd1+Δd2+Δd3+Δd4, and the circumference adjustment amount ΔC is N*Δd1+Δd2+Δd3+Δd4, wherein N is the number of layers of the diaphragm wound on the needle structure 100. Since the first diaphragm 21, the first pole piece 11, the second diaphragm 22 and the second pole piece 12 are wound on the needle structure 100 synchronously, N can be the number of layers of any one of the first diaphragm 21, the first pole piece 11, the second diaphragm 22 and the second pole piece 12 wound on the needle structure 100. Therefore, the misalignment information can be determined according to the thickness information.

[0081] In other optional embodiments, the second detection unit 220 may further obtain thickness information of at least one of the first diaphragm 21 , the first pole piece 11 , the second diaphragm 22 and the second pole piece 12 , and determine the misalignment information based on the thickness information.

[0082] Please also refer to Figure 4 to Figure 6 , Figure 4 is a schematic diagram of the three-dimensional structure of the winding needle structure 100 provided in some embodiments of the present application. Figure 5 is a top view of a winding needle structure 100 provided in some embodiments of the present application; Figure 6 yes Figure 5 Cross-sectional view at AA in the middle.

[0083] like Figure 4 to Figure 6 As shown, the winding needle structure 100 includes: a winding needle seat 110, which is rotatable around the axial direction of the winding needle structure 100; a first needle group 120, which is connected to one side of the winding needle seat 110 in the axial direction and can rotate following the rotation of the winding needle seat 110; a second needle group 130, which is arranged on one side of the first needle group 120 in the radial direction of the winding needle structure 100; a connecting member 140, which is connected between the first needle group 120 and the second needle group 130, and the second needle group 130 is movably arranged in the radial direction relative to the first needle group 120 through the connecting member 140; a piezoelectric adjusting member 150, which is arranged between the first needle group 120 and the second needle group 130, and the piezoelectric adjusting member is deformable in the radial direction to adjust the distance between the first needle group 120 and the second needle group 130 through the deformation of the piezoelectric adjusting member 150.

[0084] Axial Figure 4 The X direction in the figure is the radial direction, which is located on the plane perpendicular to the X direction. The radial direction can be Figure 1 The Z direction or Y direction in .

[0085] There are many ways for the needle winding seat 110 to drive the first needle group 120 to rotate. Optionally, at least part of the first needle group 120 is inserted into the needle winding seat 110. When the needle winding seat 110 rotates, the first needle group 120 rotates along with the rotation of the needle winding seat 110.

[0086] The needle reel 110 is used to rotate the first needle assembly 120. For example, the needle reel 110 can be connected to a motor, which drives the needle reel 110 to rotate, thereby driving the first needle assembly 120 and, in turn, the second needle assembly 130 connected to the first needle assembly 120 via a connector 140. The needle reel 110 is rotatable about its own axis N.

[0087] The second needle group 130 is located on the side of the first needle group 120 away from the axis N, and the pole piece and the diaphragm can be wound on the outer surface of the second needle group 130 away from the first needle group 120. Therefore, the outer contour size of the second needle group 130 determines the winding size of the pole piece and the diaphragm, and the outer contour size of the second needle group 130 can be considered to determine the radial size of the winding needle. The first needle group 120 and the second needle group 130 jointly constitute a winding needle for winding the pole piece and the diaphragm, and the size of the outer contour of the second needle group 130 determines the radial size of the winding needle. The second needle group 130 is connected to the first needle group 120 by the connecting piece 140 and is arranged to be movable in the radial direction relative to the first needle group 120, and optionally, the second needle group 130 is arranged to be fixed in the axial direction relative to the first needle group 120 by the connecting piece 140, so as to reduce the friction between the first needle group 120 and the second needle group 130.

[0088] The piezoelectric adjusting piece 150, for example, includes a piezoelectric crystal 151, by changing the electric field intensity in which the piezoelectric crystal 151 is located, the deformation amount of the piezoelectric crystal 151 can be changed, and then the moving distance of the second needle group 130 in the radial direction is changed, and the radial size of the winding needle is changed. The piezoelectric adjusting piece 150 can be directly selected from the finished products in the related art and arranged between the first needle group 120 and the second needle group 130.

[0089] In the technical scheme of the embodiment of the application, the winding needle structure 100 includes a winding needle base 110, a first needle group 120, a second needle group 130, a connecting piece 140, and a piezoelectric adjusting piece 150. The winding needle base 110 is arranged to be rotatable, so that the winding needle base 110 can drive the first needle group 120 and the second needle group 130 to rotate, and then the pole piece wound on the second needle group 130 can be wound to form an electric core. The first needle group 120 and the second needle group 130 are connected by the connecting piece 140, and the second needle group 130 is arranged to be movable in the radial direction relative to the first needle group 120 by the connecting piece 140, when the second needle group 130 moves in the radial direction relative to the first needle group 120, the radial size of the outer contour of the second needle group 130 can be changed, and then the radial size of the winding needle is changed, and the radial size of the electric core wound on the winding needle structure 100 is changed. The piezoelectric adjusting piece 150 is used for deforming to adjust the distance between the first needle group 120 and the second needle group 130, by the deformation adjustment of the piezoelectric adjusting piece 150, on the one hand, the structure is simple and the operation is convenient, and on the other hand, the friction between the first needle group 120, the second needle group 130 and the piezoelectric adjusting piece 150 can be improved, and the metal particles falling on the pole piece due to the friction to affect the performance of the electric core can be avoided. Therefore, the winding needle structure 100 provided by the embodiment of the application not only can adjust the radial size thereof, but also has the advantages of simple structure, convenient use and less metal particles.

[0090] According to some embodiments of the application, please continue to refer to Figure 6Optionally, the first needle group 120 comprises two or more inner needles 120a, the two or more inner needles 120a are distributed around the axis N extending in the axial direction, and the needle winding base 110 is rotatably arranged around the axis N; the second needle group 130 comprises two or more outer needles 130a, each outer needle 130a is arranged on a side of each inner needle 120a away from the axis N, and each outer needle 130a is connected with each inner needle 120a through each connecting piece 140, and each outer needle 130a and each inner needle 120a are provided with a piezoelectric adjusting piece 150.

[0091] Figure 6 The axis N of the needle winding structure 100 is schematically shown by a dot-dash line, and the axis N does not constitute a limitation on the structure of the needle winding structure 100. The inner needles 120a and the outer needles 130a can be arranged one by one in a one-to-one correspondence, and each group of inner needles 120a and outer needles 130a are connected with each other through the connecting pieces 140, and each group of inner needles 120a and outer needles 130a are provided with the piezoelectric adjusting piece 150.

[0092] By arranging the plurality of inner needles 120a and the outer needles 130a corresponding to each inner needle 120a, the radial adjustment size can be increased, and the radial size of different positions of the needle winding structure 100 can be adjusted, and the shape of the needle winding structure 100 can be adjusted.

[0093] The number of the inner needles 120a and the outer needles 130a has various embodiments, and the disclosure is exemplified by taking the number of the inner needles 120a and the outer needles 130a as two. The two inner needles 120a are symmetrically arranged on both sides of the axis N, and the two outer needles 130a are also symmetrically arranged on a side of the two inner needles 120a away from the axis N. By moving the two outer needles 130a relative to the corresponding inner needles 120a in the radial direction, the outer contour size of the second needle group 130 can be changed.

[0094] According to some embodiments of the present application, please continue to refer to Figure 6 Optionally, a side of the first needle group 120 facing the second needle group 130 has a first surface 121, and a side of the second needle group 130 facing the first needle group 120 has a second surface 131; at least one of the first surface 121 and the second surface 131 is recessed to form a containing cavity 160, and at least part of the piezoelectric adjusting piece 150 is arranged in the containing cavity 160.

[0095] When the first needle group 120 comprises a plurality of inner needles 120a, and the second needle group 130 comprises a plurality of outer needles 130a, the first surface 121 is a surface of the inner needle 120a facing the outer needle 130a, and the second surface 131 is a surface of the outer needle 130a facing the inner needle 120a.

[0096] The accommodating cavity 160 is arranged to limit the piezoelectric adjusting member 150, reduce the swing of the piezoelectric adjusting member 150 between the first needle group 120 and the second needle group 130, further reduce the friction between the first needle group 120, the second needle group 130 and the piezoelectric adjusting member 150, and avoid the generation of metal particles.

[0097] Please refer to Figure 6 and Figure 7 , Figure 7 is Figure 6 a local enlarged structure diagram of I in FIG. 1.

[0098] According to some embodiments of the present application, as shown in Figure 6 and Figure 7 , optionally, the second surface 131 is recessed to form the accommodating cavity 160; the first needle group 120 comprises a mounting hole 122 penetrating in the radial direction and a mounting boss 123 arranged in the mounting hole 122, the mounting hole 122 is communicated with the accommodating cavity 160, the mounting boss 123 is protruded from the inner surface 125 of the first needle group 120 towards the mounting hole 122, and the piezoelectric adjusting member 150 is arranged in the mounting boss 123.

[0099] The accommodating cavity 160 is recessed from the second surface 131 away from the first needle group 120, the accommodating cavity 160 is communicated with the mounting hole 122, and the accommodating cavity 160 and the mounting hole 122 jointly form a space for accommodating the piezoelectric adjusting member 150.

[0100] The number of the mounting bosses 123 is multiple, for example, the mounting boss 123 is one, and the size of the mounting boss 123 is large, so that the piezoelectric adjusting member 150 can be stably located between the mounting boss 123 and the second needle group 130. Or the mounting bosses 123 are multiple, the multiple mounting bosses 123 are distributed at intervals and used to jointly support the piezoelectric adjusting member 150. Optionally, the mounting hole 122 is a rectangular hole, the first needle group 120 has four inner surfaces 125 towards the mounting hole 122, and each inner surface 125 is provided with the mounting boss 123.

[0101] The mounting boss 123 is arranged on the first needle group 120, and the first needle group 120 and the piezoelectric adjusting member 150 are abutted with each other by the mounting boss 123, which can reduce the fitting area of the first needle group 120 and the piezoelectric adjusting member 150. On the one hand, the preparation process difficulty of the first needle group 120 and the piezoelectric adjusting member 150 can be reduced, and on the other hand, the friction between the first needle group 120 and the piezoelectric adjusting member 150 can be further improved, and the generation of metal particles can be avoided.

[0102] Optionally, the accommodating cavity 160 has an opening facing the first needle set 120, and the mounting hole 122 and the opening of the accommodating cavity 160 are sized to match, so that the inner surface 125 of the first needle set 120 facing the mounting hole 122 and the inner side surface 135 of the second needle set 130 facing the accommodating cavity 160 can be flush. The size of the space for accommodating the piezoelectric adjusting piece 150 can be enlarged, so that the piezoelectric adjusting piece 150 can simultaneously abut against the inner surface 125 of the first needle set 120 facing the mounting hole 122 and the inner side surface 135 of the second needle set 130 facing the accommodating cavity 160.

[0103] According to some embodiments of the present application, as shown in Figure 7 Optionally, the second needle set 130 has a locking hole 132 communicating with the accommodating cavity 160, and the piezoelectric adjusting piece 150 is connected to the second needle set 130 through the locking hole 132.

[0104] The second needle set 130 and the piezoelectric adjusting piece 150 can be locked to each other through the locking hole 132, so as to improve the relative position stability of the second needle set 130 and the piezoelectric adjusting piece 150, improve the mutual shaking of the second needle set 130 and the piezoelectric adjusting piece 150, improve the friction between the second needle set 130 and the piezoelectric adjusting piece 150, and avoid the generation of metal particles.

[0105] Optionally, the locking hole 132 can be a threaded hole, and the piezoelectric adjusting piece 150 is clamped by screwing the screw 123 into the locking hole 132. The locking hole 132 is arranged, for example, on the side of the accommodating cavity 160 away from the first needle set 120, and the locking hole 132 extends from the outer surface of the second needle set 130 to the second accommodating cavity 160 to pass through the second needle set 130, so as to facilitate the locking of the piezoelectric adjusting piece 150 on the outer surface of the second needle set 130.

[0106] The locking hole 132 is, for example, a stepped hole, and when the screw 123 is screwed into the locking hole 132, the screw 123 can be embedded in the locking hole 132, so that the screw 123 does not protrude from the outer surface of the second needle set 130, thereby avoiding the screw 123 scratching the pole piece or the film piece wound on the winding needle structure 100.

[0107] The number of locking holes 132 can be arranged in various ways, and each piezoelectric adjusting piece 150 can be provided with one or more locking holes 132. In some optional embodiments, each piezoelectric adjusting piece 150 is provided with four locking holes 132 arranged in two rows and two columns. The four locking holes 132 arranged in two rows and two columns can fix the piezoelectric adjusting piece 150, which not only improves the relative position stability of the piezoelectric adjusting piece 150 and the second needle set 130, but also makes the piezoelectric adjusting piece 150 bear force more evenly.

[0108] Please refer to Figure 8 , Figure 8 is Figure 5Partial cross-sectional view at the middle BB.

[0109] According to some embodiments of the present application, Figure 8 As shown, optionally, the first surface 121 is recessed to form a first connecting hole 124; the second needle group 130 has a second connecting hole 134 that penetrates radially and is connected to the first connecting hole 124; the connecting member 140 is arranged in the first connecting hole 124 and the second connecting hole 134 to connect the first needle group 120 and the second needle group 130.

[0110] The first connecting hole 124 is formed by the first surface 121 being recessed in the radial direction toward the second needle assembly 130. For example, when the second needle assembly 130 includes an outer needle 130a and the first needle assembly 120 includes an inner needle 120a, the first connecting hole 124 is formed by the first surface 121 of the inner needle 120a being recessed in the radial direction toward the outer needle 130a.

[0111] Connecting member 140 is disposed in first connecting hole 124 and second connecting hole 134, connecting first needle group 120 and second needle group 130 and securing piezoelectric adjustment member 150 between first needle group 120 and second needle group 130. Furthermore, connector 140 disposed in radially extending second connecting hole 134 provides axial restraint for second needle group 130, preventing axial movement of second needle group 130 relative to first needle group 120.

[0112] There are various ways to arrange the number of the first connecting holes 124 and the second connecting holes 134. For example, there can be two first connecting holes 124 and two second connecting holes 134, and the first connecting holes 124 and the second connecting holes 134 can be arranged in a one-to-one correspondence, and two groups of first connecting holes 124 and second connecting holes 134 can be arranged on both sides of the locking hole 132. This can improve the stability of the relative position of the first needle assembly 120 and the second needle assembly 130.

[0113] According to some embodiments of the present application, Figure 8 As shown, optionally, the connecting member 140 includes: a connecting rod 141, which is used to penetrate the first connecting hole 124 and the second connecting hole 134; a stop portion 142, which is arranged on the side of the connecting rod 141 away from the first needle group 120; a reset member 143, the first connecting hole 124 is a stepped hole and includes a recessed platform 134a, the recessed platform 134a is located on the side of the stop portion 142 facing the first surface 121, the reset member 143 is stopped between the stop portion 142 and the recessed platform 134a, and the reset member 143 has a radial reset force.

[0114] The connecting rod 141 may be, for example, a threaded rod. The first connecting hole 124 and the second connecting hole 134 are internal threaded holes. The connecting rod 141 is connected to the first connecting hole 124 and the second connecting hole 134 via threads.

[0115] The stop portion 142 may be, for example, a nut of the connecting rod 141.

[0116] The reset member 143 may be provided in various ways. For example, the reset member 143 is a spring, the spring is sleeved on the connecting rod 141 and is stopped between the stop portion 142 and the recessed platform 134a, and the reset force is the elastic force of the spring.

[0117] The reset force can provide the reset force to the first needle group 120 and the second needle group 130, so that the stability of the relative position between the first needle group 120 and the second needle group 130 can be ensured before or after the second needle group 130 moves along the radial direction relative to the first needle group 120 by the piezoelectric adjusting member 150, the friction between the first needle group 120, the second needle group 130 and the piezoelectric adjusting member 150 is reduced, and metal particles are avoided.

[0118] Please refer to Figure 9 to Figure 12 , which is a perspective view of the needle winding structure 100 provided by some embodiments of the present application, Figure 9 , which is a top view of the needle winding structure 100 provided by some embodiments of the present application; Figure 10 , which is a top view of the needle winding structure 100 provided by some embodiments of the present application; Figure 11 , which is a sectional view at C-C in Figure 10 ; and Figure 12 , which is a sectional view at C-C in Figure 11 , which is a local enlarged structure diagram at II in

[0119] According to some embodiments of the present application, as shown in Figure 9 to Figure 12 , optionally, the needle winding structure 100 further comprises a barrier 170 arranged between the piezoelectric adjusting member 150 and the second needle group 130, and the piezoelectric adjusting member 150 drives the second needle group 130 to move along the radial direction through the barrier 170.

[0120] The barrier 170 is, for example, plate-shaped and abuts between the piezoelectric adjusting member 150 and the second needle group 130, and the contact area of the barrier 170 with the piezoelectric adjusting member 150 and the second needle group 130 can be adjusted by reasonably setting the size of the barrier 170. The material of the barrier 170 is, for example, rubber or metal, etc.

[0121] The contact area of the barrier 170 with the piezoelectric adjusting member 150 and the contact area between the barrier 170 and the second needle group 130 are smaller than the contact area between the second needle group 130 and the piezoelectric adjusting member 150, so that not only the preparation difficulty of the outer surface of the second needle group 130 and the piezoelectric adjusting member 150 can be reduced, but also the friction between the second needle group 130 and the piezoelectric adjusting member 150 can be improved, and metal particles are avoided.

[0122] According to some embodiments of the present application, optionally, the needle winding structure 100 further comprises a distance sensor 180 for acquiring the distance between the first needle group 120 and the second needle group 130 in the radial direction.

[0123] The distance sensor 180 can obtain the distance between the first needle group 120 and the second needle group 130 in the radial direction, and then determine the size of the outer contour of the second needle group 130 and the winding size of the pole piece wound on the second needle group 130.

[0124] According to some embodiments of the present application, optionally, the distance sensor 180 comprises a sensing sheet 181 and a receiver 182, one of the sensing sheet 181 and the receiver 182 is arranged on the second needle group 130, and the other is arranged on the needle winding base 110.

[0125] The receiver 182 can sense the position of the sensing sheet 181, and then determine the distance between the receiver 182 and the sensing sheet 181. The distance between the first needle group 120 and the second needle group 130 in the radial direction can be determined according to the distance. The receiver 182 can be arranged on the first needle group 120, and the sensing sheet 181 can be arranged on the second needle group 130.

[0126] Optionally, since the first needle group 120 is arranged on the needle winding base 110, the relative position of the first needle group 120 and the needle winding base 110 is stable, so one of the receiver 182 and the sensing sheet 181 can be arranged on the needle winding base 110, so that one of the receiver 182 or the sensing sheet 181 is arranged on the first needle group 120 through the needle winding base 110.

[0127] Please refer to Figure 13 , Figure 13 which is a structural schematic diagram of the electric slip ring 193 of the needle winding structure 100 according to some embodiments of the present application.

[0128] According to some embodiments of the present application, optionally, as shown in Figure 13 , the needle winding structure 100 further comprises a first connecting wire 191 connected to the piezoelectric adjusting piece 150, a second connecting wire 192 for connecting an external electrical device, and an electric slip ring 193 connected to the first connecting wire 191 and the second connecting wire 192, so that the first connecting wire 191 is rotatably arranged around the axis N through the slip ring structure relative to the second connecting wire 192.

[0129] The piezoelectric adjusting piece 150 needs to generate an electric field, so the piezoelectric adjusting piece 150 needs to be connected to an external power supply. The piezoelectric adjusting piece 150 is connected to the external power supply through the first connecting wire 191, the electric slip ring 193 and the second connecting wire 192. The electric slip ring 193 can be selected from the products in the related art.

[0130] The winding needle seat 110 rotates when winding the electrode sheet. This causes the first and second needle groups 120, 130 mounted on the winding needle seat, as well as the piezoelectric adjustment member 150 located between the first and second needle groups 120, 130, to rotate, causing the first connecting wire 191 to rotate. The provision of an electric slip ring 193 allows the first connecting wire 191 to rotate relative to the second connecting wire 192, preventing the second connecting wire 192 from twisting and causing inconvenience, and also extending the service life of the first and second connecting wires 191, 192.

[0131] Please also refer to Figure 14 and Figure 15 , Figure 14 is a side view of a winding needle structure 100 provided in some embodiments of the present application. Figure 15 yes Figure 14 Cross-sectional view at DD in the middle.

[0132] According to some embodiments of the present application, Figure 14 and Figure 15 As shown, the piezoelectric adjustment member 150 optionally further includes a piezoelectric crystal 151 and a mechanical amplification structure 152, wherein the mechanical amplification structure 152 is disposed outside the piezoelectric crystal 151. The mechanical amplification structure 152 is configured to amplify the deformation of the piezoelectric crystal 151, thereby increasing the deformation of the piezoelectric adjustment member 150, thereby increasing the radial movement distance of the second needle group 130 relative to the first needle group 120.

[0133] According to some embodiments of the present application, a winding device 1000 is provided for winding a pole piece and a separator to form a battery cell. The winding device 1000 includes: a detection component 200 for detecting pole piece misalignment information; a winding needle structure 100 according to any of the above-mentioned solutions; and a processing component 300 communicatively connected to the detection component 200 and the piezoelectric adjustment component and configured to control the deformation of the piezoelectric adjustment component based on the misalignment information. The winding device 1000 includes a battery cell according to any of the above-mentioned solutions.

[0134] According to some embodiments of the present application, optionally, the winding device 1000 is characterized in that the detection component 200 includes: a first detection unit 210 for detecting misalignment information of the pole piece; and / or

[0135] Alternatively, the second detection unit 220 is used to detect thickness information of the electrode piece and / or the diaphragm and confirm the misalignment information based on the thickness information.

[0136] According to some embodiments of the present application, see Figure 4 to Figure 8The application provides a winding needle structure 100, which comprises a winding needle base 110, inner needles 120a, outer needles 130a, a connecting piece 140 and a piezoelectric adjusting piece 150. The winding needle base 110 is rotatably arranged around an axis N, the two inner needles 120a are arranged on the two sides of the axis N of the winding needle base 110 and can rotate following the rotation of the winding needle base 110, and the outer needles 130a are arranged on the outer sides of the inner needles 120a away from the axis N. The connecting piece 140 extends in the radial direction and connects the inner needles 120a and the outer needles 130a, and a reset piece 143 is arranged on the connecting piece 140. The second surface 131 of the outer needle 130a is recessed to form a containing cavity 160, a mounting boss 123 is arranged in the mounting hole 122 of the inner needle 120a, and the piezoelectric adjusting piece 150 abuts against the mounting boss 123 and the containing cavity 160. In addition, the piezoelectric adjusting piece 150 is tightly connected with the outer needle 130a through the locking hole 132.

[0137] When the piezoelectric adjusting piece 150 expands and deforms, the size of the piezoelectric adjusting piece 150 in the radial direction increases, the reset piece 143 is compressed, the outer needle 130a moves relative to the first needle group 120 in the direction away from the axis N, thus the distance between the two outer needles 130a increases, the outer contour size of the two outer needles 130a increases, and the radial size of the winding needle structure 100 increases.

[0138] According to some embodiments of the application, referring to Figure 9 to Figure 12 The application provides a winding needle structure 100, which comprises a winding needle base 110, inner needles 120a, outer needles 130a, a connecting piece 140 and a piezoelectric adjusting piece 150. The winding needle base 110 is rotatably arranged around an axis N, the two inner needles 120a are arranged on the two sides of the axis N of the winding needle base 110 and can rotate following the rotation of the winding needle base 110, and the outer needles 130a are arranged on the outer sides of the inner needles 120a away from the axis N. The connecting piece 140 extends in the radial direction and connects the inner needles 120a and the outer needles 130a, and a reset piece 143 is arranged on the connecting piece 140. The second surface 131 of the outer needle 130a is recessed to form a containing cavity 160, a mounting boss 123 is arranged in the mounting hole 122 of the inner needle 120a, and a blocking piece 170 is arranged in the containing cavity 160, and the piezoelectric adjusting piece 150 abuts against the mounting boss 123 and the blocking piece 170. In addition, the piezoelectric adjusting piece 150 is tightly connected with the outer needle 130a through the locking hole 132.

[0139] When the piezoelectric adjusting piece 150 expands and deforms, the size of the piezoelectric adjusting piece 150 in the radial direction increases, the reset piece 143 is compressed, the piezoelectric adjusting piece 150 drives the outer needle 130a to move relative to the first needle group 120 in the direction away from the axis N through the blocking piece 170, thus the distance between the two outer needles 130a increases, the outer contour size of the two outer needles 130a increases, and the radial size of the winding needle structure 100 increases.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A yam needle structure (100), characterized in that, The winding needle structure (100) comprises: a winding needle base (110) rotatably arranged around an axial direction of the winding needle structure (100); a first needle group (120) connected to one side of the winding needle base (110) in the axial direction and capable of rotating with the winding needle base (110); a second needle group (130) arranged on one side of the first needle group (120) in a radial direction of the winding needle structure (100); a connecting member (140) connected between the first needle group (120) and the second needle group (130), and the second needle group (130) is movably arranged relative to the first needle group (120) in the radial direction through the connecting member (140); a piezoelectric adjusting member (150) arranged between the first needle group (120) and the second needle group (130), and the piezoelectric adjusting member (150) is deformedly arranged along the radial direction to adjust the distance between the first needle group (120) and the second needle group (130) through the deformation of the piezoelectric adjusting member (150); one side of the first needle group (120) facing the second needle group (130) has a first surface (121), one side of the second needle group (130) facing the first needle group (120) has a second surface (131), and at least one of the first surface (121) and the second surface (131) is recessed to form a containing cavity (160), and at least part of the piezoelectric adjusting member (150) is arranged in the containing cavity (160), wherein the second surface (131) is recessed to form the containing cavity (160); the first needle group (120) comprises a mounting hole (122) penetrating along the radial direction and a mounting boss (123) arranged in the mounting hole (122), the mounting hole (122) is in communication with the containing cavity (160), the mounting boss (123) is formed by the inner surface (125) of the first needle group (120) facing the mounting hole (122), and the piezoelectric adjusting member (150) is arranged in the mounting boss (123).

2. The winding needle structure (100) according to claim 1, wherein the first needle group (120) comprises two or more inner needles (120a) distributed around an axis N extending in the axial direction, and the winding needle base (110) is rotatably arranged around the axis (N); the second needle group (130) comprises two or more outer needles (130a), each outer needle (130a) is arranged on one side of each inner needle (120a) away from the axis (N), and each outer needle (130a) is connected to each inner needle (120a) through each connecting member (140), and the piezoelectric adjusting member (150) is arranged between each outer needle (130a) and each inner needle (120a).

3. The needle structure (100) of claim 1, wherein the second needle group (130) has a locking hole (132) in communication with the containing cavity (160), and the piezoelectric adjusting member (150) is connected to the second needle group (130) through the locking hole (132).

4. The winding needle structure (100) according to claim 1, wherein the first surface (121) is recessed to form a first connecting hole (124); the second needle group (130) has a second connecting hole (134) penetrating through the radial direction and communicating with the first connecting hole (124); and the connecting member (140) is arranged in the first connecting hole (124) and the second connecting hole (134) to connect the first needle group (120) and the second needle group (130). The connecting member (140) comprises: a connecting rod (141) arranged to pass through the first connecting hole (124) and the second connecting hole (134); a stop portion (142) arranged on a side of the connecting rod (141) away from the first needle group (120); and a reset member (143), wherein the first connecting hole (124) is a stepped hole comprising a recessed portion (134a) on a side of the stop portion (142) facing the first surface (121), the reset member (143) is arranged between the stop portion (142) and the recessed portion (134a), and the reset member (143) has a radial reset force. Further comprising: a barrier member (170) arranged between the piezoelectric adjusting member (150) and the second needle group (130), wherein the piezoelectric adjusting member (150) drives the second needle group (130) to move along the radial direction through the barrier member (170). Further comprising: a distance sensor (180) arranged to obtain the distance between the first needle group (120) and the second needle group (130) along the radial direction.

5. The spool pin structure (100) of claim 4, wherein, The distance sensor (180) comprises: an inductive sheet (181) and a receiver (182), wherein one of the inductive sheet (181) and the receiver (182) is arranged on the second needle group (130), and the other is arranged on the winding needle base (110). Further comprising: a first connecting wire (191) connected to the piezoelectric adjusting member (150); a second connecting wire (192) connected to an external electrical device; and an electrically driven slip ring (193) connected to the first connecting wire (191) and the second connecting wire (192) to allow the first connecting wire (191) to rotate around the axis N relative to the second connecting wire (192) through the electrically driven slip ring (193). Further comprising: a detection component (200) arranged to detect the dislocation information of the pole piece; and a processing component (300) communicatively connected to the detection component (200) and the piezoelectric adjusting member and arranged to control the deformation of the piezoelectric adjusting member according to the dislocation information. The detection component (200) comprises: a first detection component (210) arranged to detect the dislocation information of the pole piece; and / or a second detection component (220) arranged to detect the thickness information of the pole piece and / or the diaphragm and confirm the dislocation information according to the thickness information.

6. The yarn needle structure (100) of claim 1, wherein ​ ​ 7. The needle structure (100) of claim 1, wherein ​ ​ 8. The needle winding structure (100) according to claim 7, characterized in that: ​ 9. The needle structure (100) of claim 2, wherein, ​ ​ ​ ​ 10. A winding device (1000) for winding a pole piece and a separator to form an electric core, characterized in that, ​ ​ ​ ​ 11. The winding device (1000) according to claim 10, characterized in that ​ ​ ​

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