Winding needle and winding machine

Abstract

The utility model discloses a winding needle and a winding machine. The winding needle comprises: a support disc configured to rotate around a rotation axis, the support disc being provided with a first chute extending in a radial direction of the support disc; the winding needle body is connected to the supporting disc and rotates along with the supporting disc, the winding needle body is provided with a peripheral face used for winding the sheet, the winding needle body comprises at least two winding needle pieces, part of or all the winding needle pieces are slidably connected to the first sliding grooves respectively, and the perimeter of the peripheral face can be changed by sliding the winding needle pieces along the first sliding grooves; and the locking assembly is used for limiting the position of the winding needle piece relative to the first sliding groove. Therefore, the winding needle can adjust the perimeter of the outer peripheral surface for winding, and the winding needle and the winding machine provided with the winding needle can be suitable for producing winding type electrode assemblies of various specifications and sizes.

Description

TECHNICAL FIELD

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

[0002] In the battery manufacturing process, winding the battery cell is one of the important steps in the preparation process. The winding process generally rotates the four layers of materials of the positive plate, the separator, the negative plate and the separator concentrically around the winding needle to form a battery cell.

[0003] For different battery products, the circumference of the winding needle required to be used is different. Generally, different circumferences of winding needles are made according to the needs, and are replaced during use. However, the disassembly and installation process of the winding needle is relatively troublesome, and the production cost is also increased by ordering multiple sizes of winding needles. Therefore, how to efficiently change the circumference of the winding needle is one of the needs in the industry. CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the present application provides a winding needle with variable diameter and a winding machine, so that the circumference of the winding needle can be efficiently changed.

[0005] The present application is implemented through the following technical solutions.

[0006] In a first aspect, the present application provides a winding needle, comprising: a support disc configured to rotate around a rotation axis, the support disc being provided with a first sliding groove extending along the radial direction thereof; a winding needle body connected to the support disc and configured to rotate with the support disc, the winding needle body having an outer circumferential surface for winding a sheet material, the winding needle body comprising at least two winding needle pieces, part or all of the winding needle pieces being respectively connected to the first sliding groove in a sliding manner, and the sliding of the winding needle pieces along the first sliding groove being capable of changing the circumference of the outer circumferential surface; and a locking assembly for limiting the position of the winding needle pieces relative to the first sliding groove.

[0007] In the above technical solution, since part or all of the winding needle pieces are respectively connected to the first sliding groove in a sliding manner and the first sliding groove extends along the radial direction of the support disc, each winding needle piece that can slide can move relative to the support disc, thereby moving closer to or away from each other, so as to reduce or increase the diameter and circumference of the winding needle body, thereby enabling the winding needle to be suitable for producing winding type electrode assemblies of multiple specifications and sizes. In addition, since the locking assembly is provided to limit the position of the winding needle pieces, the winding needle pieces can be fixed after moving, so as to provide a certain circumference size during the winding process, and the circumference will not float under the action of external forces such as centrifugal force, pressure of the winding type electrode assembly, etc. Furthermore, after the winding is completed, the diameter of the winding needle body can be reduced to facilitate the removal of the battery cell winding body.

[0008] In some embodiments, the winding needle further comprises a moving mechanism, which is connected with each of the slidable winding needle pieces and is configured to simultaneously drive each of the slidable winding needle pieces to move closer to or away from each other.

[0009] Thus, each of the winding needle pieces can be moved simultaneously, and compared with moving each of the winding needle pieces by hand, the synchronous movement by the moving mechanism helps to keep the winding needle pieces in a central symmetric state before and after movement, so that the expected circumference can be provided with smaller error. In addition, the movement of the plurality of winding needle pieces can be realized by operating the moving mechanism only, which is simple and fast to use, and helps to improve the manufacturing efficiency of the winding electrode assembly.

[0010] In some embodiments, the moving mechanism comprises a sliding piece and a rotating disc capable of rotating relative to the winding needle body, the rotating disc is provided with a plurality of second sliding grooves, the sliding piece is connected with each of the slidable winding needle pieces and is slidably connected with the support disc and the rotating disc, and with rotation of the rotating disc, the sliding piece is driven to slide along the second sliding grooves and the first sliding grooves, and the sliding piece drives each of the slidable winding needle pieces to move closer to or away from each other.

[0011] Since the rotating disc is provided with the second sliding grooves, and the sliding piece connected with each of the slidable winding needle pieces is slidably connected with the first sliding grooves and the second sliding grooves respectively, with rotation of the rotating disc, the groove walls of each of the second sliding grooves respectively push the sliding piece to drive the winding needle pieces to move, and then the winding needle pieces are driven to move away from or closer to each other along the first sliding grooves. Thus, the synchronous movement of the plurality of slidable winding needle pieces can be realized by operating the rotating disc to move closer to or away from each other, so that the circumference of the winding needle body can be changed.

[0012] In some embodiments, the second sliding grooves are formed in a spiral shape and are uniformly arranged around the rotation axis.

[0013] Thus, the adjustment of the circumference of the winding needle body can be realized by a simple structure, and there are fewer components and the assembly is easy.

[0014] In some embodiments, along the direction of the rotation axis, the support disc and the rotating disc are arranged with the winding needle body in between, the sliding piece comprises a first sliding connection part and a second sliding connection part which protrude from both ends of the winding needle body, the first sliding connection part is slidably connected with the first sliding grooves, and the second sliding connection part is slidably connected with the second sliding grooves.

[0015] Thus, the support disc, the rotating disc and the winding needle body can be arranged compactly, and the rotating disc is also easy to operate.

[0016] In some embodiments, the support disc and the rotating disc are mounted on the same side of the needle body along the direction of the rotation axis, the sliding member comprises a first sliding connection part and a second sliding connection part protruding from one end of the needle body, the first sliding connection part is slidingly connected to the first sliding groove, and the second sliding connection part is slidingly connected to the second sliding groove.

[0017] In this way, the support disc, the rotating disc and the needle body can be arranged compactly, and the length of the sliding member along the direction of the rotation axis can be shortened.

[0018] In some embodiments, in the same projection plane perpendicular to the rotation axis, the projection of the first sliding groove and the projection of the second sliding groove always have an overlapping part as the rotating disc rotates, the first sliding connection part and the second sliding connection part are integrally connected, and the sliding member penetrates the first sliding groove and the second sliding groove.

[0019] In this way, the rotating force of the rotating disc can be transmitted to the needle member through the continuous sliding member, and the force transmission is facilitated.

[0020] In some embodiments, the first sliding connection part and the second sliding connection part are separately arranged along the direction of the rotation axis, and the first sliding connection part and the second sliding connection part of the same needle member are spaced apart in the radial direction of the needle body.

[0021] In this way, the manufacturing and assembly precision can be reduced.

[0022] In some embodiments, the sliding member further comprises a first limiting part and a second limiting part, the first limiting part and the second limiting part are respectively connected to the two end parts of the sliding member along the direction of the rotation axis; at least a part of the support disc and at least a part of the rotating disc are located between the first limiting part and the second limiting part along the direction of the rotation axis, and the support disc abuts against the first limiting part, and the rotating disc abuts against the second limiting part; in the same projection plane perpendicular to the rotation axis, the projection of the support disc partially overlaps with the projection of the first limiting part, and the projection of the rotating disc partially overlaps with the projection of the second limiting part.

[0023] In this way, the displacement of the support disc and the rotating disc along the direction of the rotation axis can be limited by the first limiting part and the second limiting part respectively, and the risk of the sliding member falling off can be reduced.

[0024] In some embodiments, the locking assembly comprises a locking piece, a locking matching part, and a locking retaining piece, the rotating disc is provided with a plurality of the locking matching parts, the locking piece is arranged on the needle body and is configured to move back and forth between a locking position and an unlocking position relative to the rotating disc, and the locking retaining piece is arranged on at least one of the rotating disc and the needle body and is used for retaining the relative position of the locking piece and the locking matching part, in the locking position, the locking piece and the locking matching part are engaged to limit the relative movement between the rotating disc and the needle body.

[0025] Thus, the locking between the rotating disc and the needle body can be realized by the mutual cooperation of the locking piece and the locking matching part to prevent relative rotation; since the locking retaining piece is further provided, the locking between the locking piece and the locking matching part can be prevented from being loosened due to the rotation of the needle.

[0026] In some embodiments, the circumferential edge of the rotating disc is configured with a plurality of notches as the locking matching parts, and the locking assembly further comprises a limiting groove extending in the radial direction of the needle body, the locking piece is in sliding connection with the limiting groove, in the locking position, the locking piece at least partially enters the notch, and in the unlocking position, the locking piece exits the notch.

[0027] Thus, the locking of the rotating disc can be realized by the back-and-forth movement of the locking piece, the structure is simple, and the locking effect is reliable.

[0028] In some embodiments, the moving mechanism further comprises a handle, and the handle is arranged on the rotating disc.

[0029] Thus, the rotating disc is convenient to operate.

[0030] In some embodiments, the moving mechanism comprises a first connecting rod, a supporting rod arranged at the center of the supporting disc, and a sliding cylinder sleeved on the supporting rod, two ends of the first connecting rod are respectively hinged to the sliding cylinder and the slidable needle piece, with the sliding of the sliding cylinder on the supporting rod, the included angle between the first connecting rod and the supporting rod changes, and the first connecting rod drives the slidable needle piece to slide along the first sliding groove to move away from or close to each other.

[0031] Thus, when the sliding cylinder is moved, one end of each first connecting rod away from the sliding cylinder is simultaneously moved to the direction of moving away from or close to the supporting rod, thereby driving the slidable needle piece to move, so that each needle piece can be simultaneously moved away from or close to each other along the first sliding groove. The structure is simple, convenient to use, and the needle piece is stable in sliding.

[0032] In some embodiments, the moving mechanism further comprises a second connecting rod hinged to the first connecting rod, a third sliding groove extending along the direction of the rotation axis is arranged on the side of the needle piece facing the support rod, one end of the second connecting rod is in sliding connection with the third sliding groove, the other end of the second connecting rod is hinged to the support rod, and the one end of the second connecting rod slides along the third sliding groove as the angle between the first connecting rod and the support rod changes.

[0033] Thus, when the first connecting rod drives the needle piece to move, the second connecting rod slides in the third sliding groove and drives the slidable needle piece in the same direction, and the slidable needle piece can slide under the joint pushing and pulling of the first connecting rod and the second connecting rod, thereby balancing the force and moving stably, reducing the risk of tilting and slipping of the needle piece relative to the support disc when the needle piece moves.

[0034] In some embodiments, the locking assembly comprises a locking groove and an elastic locking protrusion, a plurality of locking grooves are arranged on the support rod in the extension direction of the support rod, and an elastic locking protrusion is arranged on the inner wall of the sliding cylinder, which is embedded in or out of the locking groove through elastic deformation.

[0035] Thus, the elastic locking protrusion can be engaged by the locking groove when the sliding cylinder moves to the locking groove, so that the sliding cylinder is kept at a specific position, thereby achieving the locking of the slidable needle piece. The locking can be released by moving the sliding cylinder with a larger force. The structure is simple and convenient to operate.

[0036] In some embodiments, the locking groove is arranged around part of the outer periphery of the support rod, the support rod is configured to rotate relative to the support disc, and the elastic locking protrusion enters or exits the locking groove along the circumferential surface of the support rod as the support rod rotates.

[0037] Thus, the support rod can be rotated to make the locking groove avoid the moving route of the elastic locking protrusion, so that the sliding cylinder can move smoothly, and the locking can be achieved by rotating the support rod to the position corresponding to the locking groove and the elastic locking protrusion to engage.

[0038] In some embodiments, the needle piece comprises an arc-shaped circumferential wall.

[0039] Thus, the circumferential wall can form a circumferential surface for winding, and uniform support can be provided to the entire winding body, which is conducive to improving the winding quality.

[0040] In some embodiments, the needle piece comprises an end wall and an arc-shaped circumferential wall, and the end wall is connected to one end or both ends of the arc-shaped circumferential wall in the direction of the rotation axis.

[0041] Therefore, uniform support can be provided for the entire winding body, installation of components such as the sliding member is facilitated, and sliding stability of the slidable winding needle member is improved.

[0042] In a second aspect, the application provides a winding machine, comprising a winding head and a winding needle as described above, the winding needle being connected with the winding head and rotating under the driving of the winding head.

[0043] Since the winding machine adopts the winding needle with variable diameter, the winding machine can be applied to production of winding electrode assemblies of different specifications and even battery monomers of different specifications, has wide applicability, and does not need to replace the winding needle when winding products of different specifications, which helps to simplify production steps and improve production efficiency.

[0044] 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, the application can be implemented according to the content of the specification, and in order to enable the above and other purposes, characteristics and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0045] 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:

[0046] Figure 1 A perspective view of a winding needle provided for an embodiment of the application;

[0047] Figure 2 A schematic view of winding needle members of a winding needle provided for an embodiment of the application moving away from each other;

[0048] Figure 3 A schematic view of winding needle members of a winding needle provided for an embodiment of the application moving close to each other;

[0049] Figure 4 A schematic view of a support disc provided with a through hole for an embodiment of the application;

[0050] Figure 5 A perspective view of a winding needle provided for another embodiment of the application;

[0051] Figure 6 A perspective view of a winding needle provided for still another embodiment of the application;

[0052] Figure 7 A perspective view of a winding needle provided for still another embodiment of the application; Figure 6 from another perspective;

[0053] Figure 8 A perspective view of a winding needle according to another embodiment of the present application is provided;

[0054] Figure 9 A sectional view of a winding needle provided with a second connecting rod according to an embodiment of the present application is provided;

[0055] Figure 10 A perspective view of a winding needle according to an embodiment of the present application is provided. Figure 9 A partial enlarged view of part A in FIG. 8;

[0056] Figure 11 A state diagram of a winding needle according to an embodiment of the present application is provided.

[0057] Explanation of reference signs

[0058] 10, support disc; 101, first sliding groove; 11, winding needle body; 111, winding needle piece; 1111, first wall; 1112, second wall; 1113, third wall; 12, locking assembly; 121, locking matching part; 122, limiting groove; 123, locking piece; 124, elastic locking protrusion; 125, locking groove; 13, moving mechanism; 131, sliding piece; 132, rotating disc; 1321, second sliding groove; 133, first connecting rod; 134, support rod; 135, sliding cylinder; 136, second connecting rod; 137, third sliding groove; 138, second limiting part; 14, through hole; 15, handle. DETAILED DESCRIPTION

[0059] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0060] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the present application are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0062] 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 all other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that embodiments of the present application can be combined with embodiments of the other applications.

[0063] In the description of the embodiments of the present application, the term“and / or” is merely used to describe an associated relationship between associated objects, and indicates that there can be three relationships, for example, A and / or B can indicate that there are three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally indicates that the front and rear associated objects are in an“or” relationship.

[0064] In the description of the embodiments of the present application, the technical terms“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“circumferential”, and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, operate or be used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connecting”,“fixing”, and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact, or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0067] The present application will be described in detail below.

[0068] In the battery manufacturing process, winding the battery cell is one of the important steps in the preparation process. The winding process generally rotates the four layers of materials of the positive electrode sheet, the separator, the negative electrode sheet and the separator around the winding needle concentrically to form the battery cell.

[0069] For different battery products (for example, battery monomers with different outer contour sizes of wound electrode assemblies), the required winding needle circumference is different. Generally, different circumferences of winding needles are manufactured according to the requirements, and are replaced during use. However, the disassembly and installation of the winding needle are relatively cumbersome, and the production cost is increased due to the customization of multiple sizes of winding needles. Therefore, how to efficiently change the winding needle circumference is one of the industry needs.

[0070] It is found through research that if the circumference of the winding needle can be adjusted, the circumference of the winding needle can be changed even without replacing the winding needle to adapt to the production requirements of wound electrode assemblies of different specifications.

[0071] Based on such a design concept, the present application provides a winding needle, which comprises: a support disc configured to rotate around a rotation axis, the support disc being provided with a first sliding groove extending along the radial direction thereof; a winding needle body connected to the support disc and configured to rotate with the support disc, the winding needle body having an outer circumferential surface for winding a sheet, the winding needle body comprising at least two winding needle pieces, part or all of the winding needle pieces being respectively connected to the first sliding groove in a sliding manner, and the sliding of the winding needle pieces along the first sliding groove being capable of changing the circumference of the outer circumferential surface; and a locking assembly for limiting the position of the winding needle pieces relative to the first sliding groove.

[0072] Since part or all of the winding needle pieces are respectively connected to the first sliding groove in a sliding manner, and the first sliding groove extends along the radial direction of the support disc, each slidable winding needle piece can move relative to the support disc, thereby moving closer to or away from each other, reducing or increasing the diameter and circumference of the winding needle body, so that the winding needle can be applied to the production of wound electrode assemblies of multiple specifications and sizes. In addition, since the locking assembly is provided to limit the position of the winding needle pieces, the winding needle pieces can be fixed after moving, and a certain circumference size can be provided during winding, without the circumference floating under the action of external forces such as centrifugal force, pressure of the battery winding body, etc. In addition, after winding is completed, the diameter of the winding needle body can be reduced to facilitate the removal of the battery winding body.

[0073] The winding needle provided by the embodiments of the present application can be used for the production of wound electrode assemblies, but is not limited thereto.

[0074] The following will be described with reference to the accompanying drawings.

[0075] Figure 1 A perspective view of the winding needle provided by an embodiment of the present application; Figure 2 A schematic view of the winding needle pieces of the winding needle provided by an embodiment of the present application moving away from each other; Figure 3 A schematic view of the winding needle pieces of the winding needle provided by an embodiment of the present application moving closer to each other; Figure 4 A schematic view of the support disc provided with a through hole according to an embodiment of the present application; Figure 5 A perspective view of the winding needle provided by another embodiment of the present application;Figure 6 A perspective view of a coiling needle provided in yet another embodiment of this application; Figure 7 for Figure 6 A three-dimensional diagram from another perspective; Figure 8 A perspective view of a coiling needle provided in yet another embodiment of this application; Figure 9 A cross-sectional schematic diagram of a coiling needle with a second connecting rod provided in an embodiment of this application; Figure 10 for Figure 9 A magnified view of part A in the middle; Figure 11 This is a schematic diagram of the state of the coiling needle provided in an embodiment of this application.

[0076] Firstly, such as Figure 1 As shown, this application provides a winding needle, which includes: a support disk 10 configured to rotate about a rotation axis, the support disk 10 having a first groove 101 extending radially therefrom; a winding needle body 11 connected to the support disk 10 and configured to rotate with the support disk 10, the winding needle body 11 having an outer peripheral surface for winding a sheet, the winding needle body 11 including at least two winding needle members 111, some or all of the winding needle members 111 being slidably connected to the first groove 101, and the circumference of the outer peripheral surface can be changed by sliding the winding needle members 111 along the first groove 101; and a locking assembly 12 for limiting the position of the winding needle members 111 relative to the first groove 101.

[0077] The winding needle in this application embodiment is a device in the winding equipment (also called a winding machine) used in the battery device manufacturing process.

[0078] In this embodiment, the battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or in a mixed configuration via a busbar.

[0079] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0080] A battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used. A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator located between the negative and positive electrodes.

[0081] Electrode assemblies can be wound, stacked, or a hybrid of both. The winding needles and winding machines described in this application are mainly used to produce wound electrode assemblies (also referred to herein as "wound electrode assemblies"). Wound electrode assemblies are typically structures formed by stacking and winding positive electrode sheets, negative electrode sheets, and separators into a roll.

[0082] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0083] During the winding process, the positive electrode, negative electrode, and separator are usually stacked and wound into a roll using a winding needle. After winding, the roll is removed from the winding needle and subjected to subsequent processing such as pressing and shaping.

[0084] like Figure 1 As shown, the winding needle includes a winding needle body 11, which has an arc-shaped outer peripheral surface suitable for winding, and exemplaryly, has a cylindrical outer peripheral surface. The winding needle body 11 can be configured as a cylinder or a cylindrical body in general.

[0085] The winding needle can be mounted on the winding head of a winding machine. The rotation axis of the winding needle body 11 can be coaxial with the rotation axis of the winding head. The winding head can include a drive device. The winding needle rotates continuously under the drive of the winding head (drive device) to perform the winding operation. During the winding process, the stacked electrode sheets and spacers are attached to and wrapped around the outer peripheral surface of the winding needle body 11 to form a wound body.

[0086] like Figures 2 to 4 As shown, the needle coil body 11 may include at least two needle coiling parts 111, and the relative positions of the needle coiling parts 111 to each other can be adjusted.

[0087] For example, the needle coil body 11 may include two needle coiling pieces 111, each needle coiling piece 111 being formed in a semi-cylindrical shape, and the needle coil body 11 being formed in a cylindrical shape. The two needle coiling pieces 111 may move closer to or further away from each other along the diametrical direction.

[0088] For example, the needle coil body 11 may include three or more needle coiling elements 111, each of which is formed in a prism shape, while the needle coil body 11 as a whole is formed in a cylindrical shape. These needle coiling elements 111 may have the same outline as each other or they may have different outlines. Figure 2 In the specific implementation shown, when viewed along the direction of the rotation axis, each coiled needle piece 111 is roughly fan-shaped.

[0089] Furthermore, all of these needle coils 111 can be formed as slidable needle coils 111, or some of them can be non-slidable. When only some of the needle coils 111 are slidable, the circumference of the needle coil body 11 can be adjusted by sliding these needle coils. In this embodiment, an example is given where all needle coils 111 are slidable; however, as described above, the application is not limited to the case where all needle coils are slidable.

[0090] When the needle coils 111 are close to each other or in close contact, the outer surfaces of the needle coils 111 can form a continuous or nearly continuous outer circumferential surface. The radial dimension and circumference of the needle coil body 11 are small. When the needle coils 111 are far apart from each other, the outer surfaces of the needle coils 111 can form a discontinuous outer circumferential surface. The distance between the outer circumferential surfaces is large, and the radial dimension of the needle coil body 11 is large. At this time, the needle coils 111 are arranged in a centrally symmetrical manner.

[0091] like Figures 1 to 4 As shown, the winding needle also includes a support disk 10. The support disk 10 supports the winding needle body 11 and is configured to rotate about a rotation axis (virtual axis, not shown in the figure). Exemplarily, the support disk 10 is formed in a disk shape, but the support disk 10 is not limited to a disk shape; it can also be an elliptical disk, a sun disc, etc. Figure 1 As shown, the support plate 10 is located at one end of the rotation axis of the needle coil body 11.

[0092] like Figure 1 As shown, a first groove 101 is constructed on the support plate 10, extending radially along the support plate 10. The first groove 101 can be an elongated hole penetrating the support plate 10 along the circumferential direction of rotation. Optionally, the number of first grooves 101 can be the same as the number of slidable needle coiling parts 111, and each first groove 101 can be correspondingly set with each needle coiling part 111. Optionally, one first groove 101 can also be set to correspond to two slidable needle coiling parts 111, with each of the two needle coiling parts 111 sliding using a section of the first groove 101. It should be noted that the rotation axis of the support plate 10 can be coaxial with the overall rotation axis of the needle coiling body 11.

[0093] The needle winding also includes a locking assembly for limiting the position of the slidable needle winding member 111 relative to the first slide groove 101. Exemplarily, the locking assembly can achieve locking by directly limiting the sliding of the needle winding member 111 along the first slide groove 101, or by limiting the action of the drive mechanism that drives the needle winding member 111 to slide (described in detail below).

[0094] In the above technical solution, since the partial or whole needle pieces 111 are respectively slidably connected to the first sliding groove 101 which extends along the radial direction of the support disc 10, each of the slidable needle pieces 111 can move relative to the support disc 10, thereby approaching or moving away from each other, and the diameter and circumference of the needle body 11 can be reduced or increased, so that the needle can be adapted to produce various specifications of the wound electrode assembly. Since the locking assembly is provided to limit the position of the needle piece 111, the needle piece 111 can be fixed after moving, and a certain circumference size can be provided during winding, without the circumference floating under the action of external forces such as centrifugal force, pressure of the wound electrode assembly, etc. In addition, after winding is completed, the diameter of the needle body 11 can be reduced to facilitate the removal of the battery cell.

[0095] In some embodiments, as shown in Figures 2 to 9 The needle further comprises a moving mechanism 13 which is respectively connected to the slidable needle pieces 111 and is configured to simultaneously drive the slidable needle pieces 111 to approach or move away from each other.

[0096] The moving mechanism 13 functions as a driving mechanism to drive the needle pieces 111 to slide. The moving mechanism 13 is respectively connected to each of the slidable needle pieces 111, thereby being able to drive each of the slidable needle pieces 111. In addition, the moving mechanism 13 is configured to simultaneously drive each of the slidable needle pieces 111 to move, for example, simultaneously slide towards the inner radial side or simultaneously slide towards the outer radial side along the radial direction, and accordingly, the outer circumferential surfaces of these needle pieces 111 approach or move away from each other along the circumferential direction, thereby being able to provide a winding surface with a smaller circumference or a winding surface with a longer circumference.

[0097] In some embodiments, the moving mechanism 13 can be a mechanism to simultaneously drive each of the slidable needle pieces 111 to slide along the first sliding groove 101 (to be described in detail below).

[0098] In other embodiments, the moving mechanism 13 can comprise a plurality of driving devices and a control device to control the actions of these driving devices, each driving device is provided corresponding to one needle piece 111, and the driving end of each driving device is connected to each needle piece 111. Each driving device drives each of the slidable needle pieces 111 to simultaneously slide towards the inner radial side or simultaneously slide towards the outer radial side along the first sliding groove 101 under the control of the control device, thereby driving the outer circumferential surfaces of the slidable needle pieces 111 to approach or move away from each other along the circumferential direction. Exemplarily, the driving device can be a pneumatic cylinder, a lead screw, etc.

[0099] Thus, the plurality of needle members 111 can be simultaneously moved, and compared with individually moving the plurality of needle members 111 by hand, the simultaneous movement by the moving mechanism 13 helps the needle members 111 to keep the central symmetric state before and after the movement, so that the expected circumference can be provided with less error. In addition, the movement of the plurality of needle members 111 can be realized by operating the moving mechanism 13 only, which is simple and fast to use, and helps to improve the manufacturing efficiency of the wound electrode assembly.

[0100] In some embodiments, as shown in Figures 2 to 7 The moving mechanism 13 includes a sliding member 131 and a rotating disc 132 capable of rotating relative to the needle body 11, and the rotating disc 132 is provided with a plurality of second sliding grooves 1321. The sliding member 131 is connected to the plurality of slidable needle members 111 and is slidably connected to the support disc 10 and the rotating disc 132. With the rotation of the rotating disc 132, the sliding member 131 is driven to slide along the second sliding grooves 1321 and the first sliding grooves 101, and the sliding member 131 drives the slidable needle members 111 to move towards or away from each other.

[0101] The moving mechanism 13 includes the rotating disc 132 and the sliding member 131, and the rotating disc 132 can simultaneously transmit external torque (for example, torque applied by manually operating the rotating disc 132) to each sliding member 131 to drive each sliding member 131 to slide along the first sliding grooves 101. It can be seen that the rotating disc 132 is a component capable of converting torque into linear motion. Each sliding member 131 is connected to each slidable needle member 111, so as to drive each needle member 111 to slide towards the radial outside or the radial inside.

[0102] In some embodiments, as shown in Figures 2 to 7 The rotating disc 132 is provided with a plurality of second sliding grooves 1321. In some embodiments, the number of second sliding grooves 1321 is consistent with the number of sliding members 131. The plurality of second sliding grooves 1321 are arranged on the rotating disc 132 in a central symmetric manner relative to the rotation axis. The extension direction of the second sliding grooves 1321 has an angle relative to the radial direction of the rotating disc 132, and the extension direction of each second sliding groove 1321 has the same angle relative to the radial direction of the rotating disc 132, so that the second sliding grooves 1321 are capable of rotating around the rotation axis while applying a radial thrust to the sliding member 131 in the groove.

[0103] In some embodiments, the second sliding grooves 1321 are formed in a spiral shape and are uniformly arranged around the rotation axis.

[0104] The slider 131 is configured, for example, as a rod or a pin. A portion of the slider 131 is inserted into the first groove 101 and is slidable within the first groove 101. Another portion of the slider 131 is inserted into the second groove 1321 and is slidable within the second groove 1321. Optionally, the slider 131 may be a continuous component, such as a single pin inserted into the first groove 101 and the second groove 1321; alternatively, the slider 131 may also be a collection of multiple sliding connections respectively disposed on the needle coiling member 111 and transmitting force through the needle coiling member 111, wherein a portion of the sliding connection is inserted into the first groove 101 and another portion of the sliding connection is inserted into the second groove 1321.

[0105] The sliding member 131, which is a continuous component, can be connected to one end of the radial inner side of each needle coiling member 111, or it can be disposed through each needle coiling member 111 along the direction of the rotation axis.

[0106] When viewed along the axis of rotation, the sliding connection part that is slidably connected to the first slide groove 101 and the sliding connection part that is slidably connected to the second slide groove 1321 may or may not overlap.

[0107] Because the rotating disk 132 has a second groove 1321, and the sliding member 131 connected to the slidable needle coiling member 111 is slidably connected to the first groove 101 and the second groove 1321 respectively, when the rotating disk 132 is rotated, the groove wall of each second groove 1321 pushes the sliding member 131, thereby driving the needle coiling member 111 to move. Thus, the needle coiling members 111 are driven to move away from or towards each other along the first groove 101. Therefore, by operating the rotating disk 132, multiple slidable needle coiling members 111 can be made to move closer or further away synchronously, thereby changing the circumference of the needle coiling body 11.

[0108] In some embodiments, such as Figures 2 to 4 As shown, along the direction of the rotation axis, the support disk 10 and the rotating disk 132 are disposed across the needle winding body 11. The sliding member 131 includes a first sliding connection portion and a second sliding connection portion protruding from both ends of the needle winding body 11. The first sliding connection portion is slidably connected to the first slide groove, and the second sliding connection portion is slidably connected to the second slide groove.

[0109] For example, the first sliding connection portion and the second sliding connection portion can be configured as a column or a pin, respectively.

[0110] In another specific embodiment, such as Figures 2 to 4As shown, along the direction of the rotation axis, the rotating disc 132, the winding needle member 111 and the supporting disc 10 are sequentially stacked, and the sliding member 131 is arranged on both sides of the winding needle member 111, the second sliding connection part close to the rotating disc 132 is accommodated in the second sliding groove 1321, and the first sliding connection part close to the supporting disc 10 is accommodated in the first sliding groove 101. When adjusting the radial dimension of the winding needle body 11, the rotating disc 132 rotates relative to the supporting disc 10, the second sliding connection part in the second sliding groove 1321 drives the winding needle member 111 to move along the first sliding groove 101 under the pushing of the second sliding groove 1321, so that each winding needle member 111 moves simultaneously.

[0111] Thus, the supporting disc, the rotating disc and the winding needle body can be arranged compactly, and the rotating disc is also easy to rotate.

[0112] In some embodiments, as shown in Figure 6 and Figure 7 As shown, along the direction of the rotation axis of the winding needle body 11, the supporting disc 10 and the rotating disc 132 are installed on the same side of the winding needle body 11, the sliding member 131 includes the first sliding connection part and the second sliding connection part protruding from one end of the winding needle body 11, the first sliding connection part is slidingly connected to the first sliding groove 101, and the second sliding connection part is slidingly connected to the second sliding groove 1321.

[0113] In one specific embodiment, as shown in Figure 6 and Figure 7 As shown, along the direction of the rotation axis of the winding needle body 11, the winding needle member 111, the supporting disc 10 and the rotating disc 132 are sequentially stacked, the sliding member 131 is arranged on the side of the winding needle member 111 close to the supporting disc 10, the sliding member 131 protrudes from the surface of the winding needle body 111 towards the direction close to the supporting disc 10, and the sliding member 131 includes the first sliding connection part slidingly connected to the first sliding groove 101 and the second sliding connection part slidingly connected to the second sliding groove 1321. The first sliding connection part and the second sliding connection part can be an integral structure, that is, the first sliding connection part and the second sliding connection part are connected to each other and extend along the same extension line, and the sliding member 131 sequentially passes through the first sliding groove 101 and the second sliding groove 1321. The first sliding connection part and the second sliding connection part can also be a split structure, that is, the first sliding connection part and the second sliding connection part are arranged separately in the radial direction of the winding needle body 11.

[0114] When adjusting the radial dimension of the winding needle body 11, the rotating disc 132 rotates relative to the supporting disc 10, and the sliding member 131 moves along the first sliding groove 101 under the pushing of the second sliding groove 1321, so that each winding needle member 111 moves simultaneously.

[0115] Due to the second chute 1321 inclined or helical relative to the radial direction formed in the rotating disc 132, the winding needle 111 is in sliding connection with the first chute 101 and the second chute 1321, and thus the wall of each second chute 1321 pushes each winding needle 111 to move when the rotating disc 132 rotates, so that each winding needle 111 can simultaneously move away from or close to each other along the first chute 101. The structure is simple and convenient to use.

[0116] In some embodiments, in the same projection plane perpendicular to the rotation axis, the projection of the first chute 101 and the projection of the second chute 1321 always have an overlapping part as the rotating disc 132 rotates, the first sliding connection part and the second sliding connection part are integrally connected, and the sliding part 131 penetrates the first chute 101 and the second chute 1321.

[0117] In some embodiments, as shown in Figure 6 and Figure 7 , the winding needle 111 comprises an arc-shaped peripheral wall.

[0118] The winding needle 111 comprises a first wall 1111 having an outer peripheral surface. The winding needle 111 comprises at least the first wall 1111, and the first wall 1111 has an outer peripheral surface. A plurality of first walls 1111 are approximately cylindrical after being opposite to each other, and the side of the first wall 1111 close to the rotation axis of the winding needle body 11 is the radial inner side of the first wall 1111, and the side of the first wall 1111 away from the center of the winding needle body 11 is the radial outer side. In some embodiments, the first wall 1111 can also be referred to as a peripheral wall, which is configured as an arc-shaped peripheral wall.

[0119] In the direction of the rotation axis of the winding needle body 11, the sliding part 131 is arranged on one side or both sides of the first wall 1111, and in the same projection plane perpendicular to the rotation axis of the winding needle body 11, the projections of the first chute 101 and the second chute 1321 have an overlapping part, and the projection of the sliding part 131 in the projection plane overlaps with the overlapping part. In this way, the sliding part 131 can be arranged in the first chute 101 and the second chute 1321.

[0120] In a specific embodiment, as shown in Figure 6 and Figure 7 , in the direction of the rotation axis of the winding needle body 11, the winding needle 111, the support disc 10 and the rotating disc 132 are sequentially stacked, the sliding part 131 is arranged on the side of the first wall 1111 close to the support disc 10, and the sliding part 131 sequentially penetrates the first chute 101 and the second chute 1321.

[0121] In another specific embodiment, the rotating disc 132, the winding needle piece 111 and the support disc 10 are sequentially stacked along the rotation axis of the winding needle body 11, and the sliding piece 131 is arranged on both sides of the first wall 1111, the sliding piece 131 close to the rotating disc 132 is accommodated in the second sliding slot 1321, and the sliding piece 131 close to the support disc 10 is accommodated in the first sliding slot 101.

[0122] In another specific embodiment, the rotating disc 132, the winding needle piece 111 and the support disc 10 are sequentially stacked along the rotation axis of the winding needle body 11, and the sliding piece 131 is arranged on both sides of the first wall 1111, the sliding piece 131 close to the rotating disc 132 is accommodated in the second sliding slot 1321, and the sliding piece 131 close to the support disc 10 is accommodated in the first sliding slot 101.

[0123] In some embodiments, the winding needle piece further comprises an end wall connected to one end or both ends of the arc-shaped peripheral wall along the rotation axis.

[0124] The winding needle piece 111 can further comprise a second wall 1112 extending perpendicularly to the first wall 1111 along the rotation axis of the winding needle body 11, and the second wall 1112 is located on one side of the first wall 1111. The sliding piece 131 can be arranged on the first wall 1111 and / or the second wall 1112.

[0125] The winding needle piece 111 can further comprise a third wall 1113 extending perpendicularly to the first wall 1111 along the rotation axis of the winding needle body 11, and the second wall 1112 and the third wall 1113 are located on both sides of the first wall 1111, respectively. The sliding piece 131 can be arranged on the second wall 1112 and / or the third wall 1113. In some embodiments, the second wall 1112 and the third wall 1113 can be referred to as end walls connected to one end or both ends of the arc-shaped peripheral wall along the rotation axis.

[0126] Therefore, the rotating disc 132 and the support disc 10 can be arranged on both sides of the winding needle body 11 or on one side of the winding needle body 11, which can be flexibly arranged as needed, and each winding needle piece 111 only needs to include one first wall 1111 to realize the winding and movement of the battery cell, which is simple in structure and low in manufacturing cost. In addition, when the rotating disc 132 and the support disc 10 are located on the same side of the winding needle body 11, each winding needle piece 111 only needs to arrange one sliding piece 131 to pass through the overlapping position of the first sliding slot 101 and the second sliding slot 1321 to realize the sliding connection, which is simple and compact in structure.

[0127] In some embodiments, the first sliding connection part and the second sliding connection part are separately arranged along the rotation axis, and the first sliding connection part and the second sliding connection part arranged on the same winding needle piece 111 are spaced apart in the radial direction of the winding needle body 11.

[0128] In some embodiments, as shown in Figures 2 to 5 the first wall 1111 has an outer circumferential surface, and the second wall 1112 extends perpendicularly to the first wall 1111. Along the axial direction of the needle body 11, the second wall 1112 is located on one side of the first wall 1111. Two sliding members 131 are respectively arranged on the second wall 1112 and the side of the first wall 1111 away from the second wall 1112. One of the sliding members 131 is in sliding connection with the first sliding groove 101, and the other sliding member 131 is in sliding connection with the second sliding groove 1321. Alternatively, the two sliding members 131 are arranged on the second wall 1112 and spaced apart from each other along the radial direction of the needle body 11. The center of the support disc 10 is provided with a through hole 14, and the sliding member 131 close to the center of the support disc 10 passes through the through hole 14 and is in sliding connection with the second sliding groove 1321, and the sliding member 131 away from the center of the support disc 10 is in sliding connection with the first sliding groove 101.

[0129] The needle member 111 includes the first wall 1111 and the second wall 1112. The first wall 1111 has an outer circumferential surface, and the second wall 1112 extends perpendicularly to the first wall 1111. Along the axial direction of the needle body 11, the second wall 1112 is located on one side of the first wall 1111. For one needle member 111, one sliding member 131 can be arranged on the second wall 1112 and the first wall 1111, respectively. If the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane overlap along the axial direction of the needle body 11, one sliding member 131 can be arranged on either the first wall 1111 or the second wall 1112. If the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap along the axial direction of the needle body 11, two sliding members 131 spaced apart from each other are arranged on the second wall 1112.

[0130] In a specific embodiment, as shown in Figure 4 the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap along the axial direction of the needle body 11, and the needle member 111, the support disc 10, and the rotating disc 132 are stacked in sequence. The second wall 1112 is located on the side of the first wall 1111 close to the support disc 10, and two sliding members 131 are arranged on the second wall 1112 and spaced apart from each other along the radial direction of the needle body 11. The center of the support disc 10 is provided with a through hole 14, and the sliding member 131 close to the center of the needle body 11 passes through the through hole 14 and is accommodated in the second sliding groove 1321, and the sliding member 131 away from the center of the needle body 11 is accommodated in the first sliding groove 101.

[0131] In another specific embodiment, as shown in Figure 2 , Figure 3 and Figure 5As shown, in the axial direction of the winding needle body 11, the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap, and the rotating disc 132, the winding needle piece 111 and the support disc 10 are sequentially stacked. The second wall 1112 can be located on the side of the first wall 1111 close to the support disc 10, or on the side of the first wall 1111 close to the rotating disc 132. Two sliding members 131 are respectively arranged on the side of the first wall 1111 and the second wall 1112 away from the first wall 1111, one of the two sliding members 131 is accommodated in the first sliding groove 101, and the other sliding member 131 is accommodated in the second sliding groove 1321.

[0132] In another specific embodiment, in the axial direction of the winding needle body 11, the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap, and the winding needle piece 111, the rotating disc 132 and the support disc 10 are sequentially stacked. The second wall 1112 is located on the side of the first wall 1111 close to the rotating disc 132, and two sliding members 131 are arranged on the second wall 1112, and the two sliding members 131 are arranged apart from each other in the radial direction of the winding needle body 11. A through hole 14 is formed in the center of the rotating disc 132, the sliding member 131 close to the center of the winding needle body 11 passes through the through hole 14 and is accommodated in the first sliding groove 101, and the sliding member 131 away from the center of the winding needle body 11 is accommodated in the second sliding groove 1321.

[0133] Therefore, the rotating disc 132 and the support disc 10 can be arranged on both sides of the winding needle body 11, or on one side of the winding needle body 11, and can be flexibly arranged as needed. Rotating the rotating disc 132 moves the second sliding groove 1321, and the groove wall of the second sliding groove 1321 can simultaneously push the sliding members 131 to move the winding needle pieces 111 simultaneously, which is simple and fast to use.

[0134] In some embodiments, continuing to refer to Figures 2 to 5 , the winding needle piece 111 includes a first wall 1111 having an outer circumferential surface, a second wall 1112 and a third wall 1113 perpendicular to the first wall 1111, the second wall 1112 and the third wall 1113 are respectively arranged on both sides of the first wall 1111 in the axial direction of the winding needle body 11, two sliding members 131 are respectively arranged on the second wall 1112 and the third wall 1113, one sliding member 131 is in sliding connection with the first sliding groove 101, and the other sliding member 131 is in sliding connection with the second sliding groove 1321, or the two sliding members 131 are arranged apart from each other in the radial direction of the winding needle body 11 on the second wall 1112 or the third wall 1113, a through hole 14 is formed in the center of the support disc 10, the sliding member 131 close to the center of the support disc 10 passes through the through hole 14 and is in sliding connection with the second sliding groove 1321, and the sliding member 131 away from the center of the support disc 10 is in sliding connection with the first sliding groove 101.

[0135] The winding needle piece 111 comprises a first wall 1111, a second wall 1112 and a third wall 1113. The first wall 1111 has an outer circumferential surface. The second wall 1112 extends perpendicularly to the first wall 1111. The third wall 1113 extends perpendicularly to the first wall 1111 and parallel to the second wall 1112. The second wall 1112 and the third wall 1113 are located on two sides of the first wall 1111 along the axial direction of the winding needle body 11.

[0136] For one winding needle piece 111, one sliding piece 131 can be arranged on the second wall 1112 and the third wall 1113 respectively. If the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane overlap along the axial direction of the winding needle body 11, one sliding piece 131 can be arranged on either the second wall 1112 or the third wall 1113. If the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap along the axial direction of the winding needle body 11, two sliding pieces 131 are arranged on the second wall 1112 or the third wall 1113.

[0137] In a specific embodiment, as shown in Figure 4 , the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap along the axial direction of the winding needle body 11. The winding needle piece 111, the support disc 10 and the rotating disc 132 are stacked in sequence. Two sliding pieces 131 are arranged on the second wall 1112 or the third wall 1113. The two sliding pieces 131 are arranged apart from each other along the radial direction of the winding needle body 11. A through hole 14 is formed in the center of the support disc 10. The sliding piece 131 close to the center of the winding needle body 11 passes through the through hole 14 and is accommodated in the second sliding groove 1321. The sliding piece 131 away from the center of the winding needle body 11 is accommodated in the first sliding groove 101.

[0138] In another specific embodiment, as shown in Figure 2 , Figure 3 and Figure 5 , the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap along the axial direction of the winding needle body 11. The rotating disc 132, the winding needle piece 111 and the support disc 10 are stacked in sequence. Two sliding pieces 131 are arranged on the second wall 1112 and the third wall 1113 respectively. One of the sliding pieces 131 is accommodated in the first sliding groove 101. The other sliding piece 131 is accommodated in the second sliding groove 1321.

[0139] In another specific embodiment, the projections of the first sliding groove 101 and the second sliding groove 1321 in the same projection plane do not overlap in the axial direction of the winding needle body 11, and the winding needle member 111, the rotating disc 132 and the support disc 10 are sequentially stacked. Two sliding members 131 are arranged on the side of the winding needle member 111 close to the rotating disc 132, and the two sliding members 131 are arranged apart from each other in the radial direction of the winding needle body 11. A through hole 14 is formed in the center of the rotating disc 132, and the sliding member 131 close to the center of the winding needle body 11 is accommodated in the first sliding groove 101 through the through hole 14, and the sliding member 131 away from the center of the winding needle body 11 is accommodated in the second sliding groove 1321.

[0140] Therefore, the rotating disc 132 and the support disc 10 can be arranged on both sides of the winding needle body 11, or on one side of the winding needle body 11; the sliding member 131 can be arranged on either one or both of the second wall 1112 and the third wall 1113, and can be flexibly arranged as needed. Rotating the rotating disc 132 moves the second sliding groove 1321, and the groove wall of the second sliding groove 1321 can simultaneously push each sliding member 131 to move each winding needle member 111, which is simple and fast to use.

[0141] In some embodiments, the sliding member further comprises a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are respectively connected to the two end portions of the sliding member in the direction of the rotation axis; at least a portion of the support disc and at least a portion of the rotating disc are located between the first limiting portion and the second limiting portion in the direction of the rotation axis, and the support disc abuts against the first limiting portion, and the rotating disc abuts against the second limiting portion; in the same projection plane perpendicular to the rotation axis, the projection of the support disc partially overlaps with the projection of the first limiting portion, and the projection of the rotating disc partially overlaps with the projection of the second limiting portion.

[0142] A first limiting portion (not shown in the figure) is arranged between the sliding member 131 (the first sliding connecting portion) and the support disc 10, and a second limiting portion 138 is arranged between the sliding member 131 (the second sliding connecting portion) and the rotating disc 132. For example, the first limiting portion and the second limiting portion comprise limiting blocks respectively connected to the two ends of the sliding member 131, and the profile sizes of the limiting blocks are respectively greater than the groove width sizes of the first sliding groove 101 and the second sliding groove 1321, thereby preventing the sliding member 131 from being pulled out of the respective sliding grooves. The first limiting portion can have substantially the same structure as the second limiting portion 138.

[0143] The first sliding connection part of the sliding member 131 can be accommodated in the first sliding groove 101 and can slide along the first sliding groove 101, and the second sliding connection part of the sliding member 131 can be accommodated in the second sliding groove 1321 and can slide along the second sliding groove 1321. The sliding member 131 is further connected to the needle roller 111, and the side of the first sliding connection part away from the second sliding connection part is provided with a first limiting part, and the side of the second sliding connection part away from the first sliding connection part is provided with a second limiting part. The first limiting part and the second limiting part are configured to block the relative displacement of the support disc 10 relative to the sliding member 131 and the rotating disc 132 relative to the sliding member 131 in the direction of the rotation axis.

[0144] In the direction of the rotation axis, the projection of the first sliding connection part is located within the projection range of the first sliding groove 101, and the first limiting part overlaps the projection part of the same projection plane of the first sliding groove 101.

[0145] The second sliding connection part of the sliding member 131 can be accommodated in the second sliding groove 1321, and in the direction of the rotation axis, the projection of the second sliding connection part is located within the projection range of the second sliding groove 1321, and the second sliding connection part overlaps the projection part of the same projection plane of the second sliding groove 1321.

[0146] Therefore, the displacement of the support disc 10 and the rotating disc 132 in the direction of the rotation axis can be limited by the first limiting part and the second limiting part respectively, and the risk of the sliding member falling off can be reduced. The two limiting parts and the needle roller 111 limit the sliding member 131 from both sides, so that the first sliding connection part and the second sliding connection part can be continuously accommodated in the sliding groove, and the sliding member 131 is not easy to fall off from the sliding groove, which helps to improve the use reliability.

[0147] In some embodiments, as shown in Figure 5 , Figure 7 The locking assembly 12 includes a locking member 123, a locking matching part 121, and a locking retaining member. The rotating disc 132 is provided with a plurality of locking matching parts 121, the locking member 123 is arranged on the needle roller body 11 and is configured to be able to move back and forth relative to the rotating disc 132 between a locking position and an unlocking position, and the locking retaining member is arranged on at least one of the rotating disc 132 and the needle roller body 11, for retaining the relative position of the locking member 123 and the locking matching part 121. In the locking position, the locking assembly 12 is clamped with the locking matching part to limit the relative movement between the rotating disc and the needle roller body.

[0148] The locking assembly 12 is used to limit the position of the needle roller 111 relative to the first sliding groove 101. The locking assembly 12 can include a locking member 123 and a locking matching part 121, which are respectively formed on the rotating disc 132 and the needle roller body 11. In Figure 5 and Figure 7In the shown embodiment, the locking matching part 121 is formed on the rotating disc 132, and the locking member 123 is formed on the needle body 11. Alternatively, the locking matching part 121 can be formed on the edge of the rotating disc 132 or on the surface of the rotating disc 132. Alternatively, the locking member 123 can be a locking pin, a locking hook, a locking block, etc.

[0149] In Figure 5 、 Figure 7 the shown embodiment, the rotating disc 132 is provided with a plurality of locking matching parts 121, and the locking member 123 is arranged on the needle body 11. The locking member 123 is configured to move back and forth between the locking position and the unlocking position relative to the rotating disc 132. Alternatively, the locking member 123 can move along the radial direction. When the locking member 123 moves towards the radial inner side and engages with the locking matching part 121 so that the rotating disc 132 cannot rotate, the locking member 123 is in the locking position. When the locking member 123 moves towards the radial outer side and completely exits the locking matching part 121 so that the rotating disc 132 can rotate without any obstacle, the locking member 123 is in the unlocking position.

[0150] In addition, the rotating disc 132 and / or the needle body 11 is also provided with a locking retaining member, which can be a locking pin, a locking structure or a spring member, for retaining the locking member 123 in the locking position or the unlocking position.

[0151] Thus, the locking of the rotating disc can be realized by the back and forth movement of the locking member 123, and the structure is simple and the locking effect is reliable.

[0152] In some embodiments, as shown in Figure 5 and Figure 7 , the circumferential edge of the rotating disc 132 is configured with a plurality of notches as the locking matching part 121. The locking assembly 12 further includes a limiting groove 122 extending along the radial direction of the needle body 11. The locking member 123 is in sliding connection with the limiting groove 122. In the locking position, the locking member 123 at least partially enters the notch. In the unlocking position, the locking member 123 exits the notch.

[0153] The circumferential edge of the rotating disc 132 is provided with a notch recessed towards the center as the locking matching part 121. The locking member 123 is configured to enter or exit the notch. Specifically, the locking assembly 12 further includes a limiting groove 122. The extending direction of the limiting groove 122 is parallel to the radial direction of the needle body 11. The limiting groove 122 has an opening. A part of the locking member 123 is accommodated in the limiting groove 122. Another part of the locking member 123 can extend into the notch through the opening to block the rotation of the rotating disc 132; or can be retracted into the limiting groove 122 to release the locking.

[0154] If the rotating disc 132 and the support disc 10 are respectively located on two sides of the winding needle 111, the locking assembly 12 can be arranged on the side of the winding needle 111 close to the rotating disc 132 along the direction of the rotation axis of the winding needle body 11; if the rotating disc 132 and the support disc 10 are located on the same side of the winding needle 111, the locking assembly 12 can be arranged on the side of the support disc 10 close to the rotating disc 132.

[0155] Thus, the limiting groove 122 can guide the moving path of the locking piece 123, the locking piece 123 can enter the notch by sliding, the locking piece 123 is blocked on the rotating path of the rotating disc 132, and the locking of the rotating disc 132 is realized; or the locking piece 123 can slide out of the notch, and the rotating disc 132 is freely rotated. Thus, the locking of the rotating disc can be realized by the advance and retreat of the locking piece 123, the structure is simple, and the locking effect is reliable.

[0156] In some embodiments, as shown in Figure 2 , Figure 3 , Figure 5 and Figure 7 , the moving mechanism 13 further includes a handle 15 arranged on the rotating disc 132.

[0157] The handle 15 is arranged on the side surface of the rotating disc 132 away from the winding needle body 11, and the handle 15 protrudes from the surface of the rotating disc 132.

[0158] Thus, the user can conveniently hold and rotate the rotating disc 132.

[0159] In some embodiments, as shown in Figure 8 , the moving mechanism 13 includes a first connecting rod 133, a support rod 134 arranged at the center of the support disc 10, and a sliding cylinder 135 sleeved on the support rod 134, two ends of the first connecting rod 133 are respectively hinged to the sliding cylinder 135 and the winding needle 111, with the sliding of the sliding cylinder 135 on the support rod 134, the included angle between the first connecting rod 133 and the support rod 134 changes, and the first connecting rod 133 drives the slidable winding needle 111 to slide along the first sliding groove 101 to approach or move away from each other.

[0160] The moving mechanism 13 includes the first connecting rod 133, the support rod 134 and the sliding cylinder 135. The support rod 134 is arranged at the center of the support disc 10, and the extension direction of the support rod 134 is parallel to the axial direction of the winding needle body 11. The sliding cylinder 135 is sleeved on the support rod 134 and can move along the support rod 134 to the direction close to or away from the support disc 10. The first connecting rod 133 is arranged in one-to-one correspondence with the winding needle 111, one end of the first connecting rod 133 is hinged to the sliding cylinder 135, and the other end of the first connecting rod 133 is hinged to the winding needle 111.

[0161] The sliding cylinder 135 is hingedly connected to each first connecting rod 133. In use, the sliding cylinder 135 is moved to push or pull the corresponding needle element 111 away from or towards the support rod 134 through each first connecting rod 133, so as to simultaneously move all the needle elements 111, thereby adjusting the radial size of the needle body 11.

[0162] Thus, when the sliding cylinder 135 is moved, the end of each first connecting rod 133 away from the sliding cylinder 135 is simultaneously moved towards or away from the support rod 134, thereby driving the movement of each needle element 111, so that each needle element 111 can be simultaneously moved away from or towards each other along the first sliding groove 101. The structure is simple and convenient to use.

[0163] In some embodiments, as shown in Figure 9 , the moving mechanism 13 further comprises a second connecting rod 136 hingedly connected to the first connecting rod 133, and the side of the needle element 111 along the radial direction towards the support rod 134 is provided with a third sliding groove 137 extending along the direction of the rotation axis, one end of the second connecting rod 136 is slidingly connected to the third sliding groove 137, the other end of the second connecting rod 136 is hingedly connected to the support rod 134, and the end of the second connecting rod 136 slides along the third sliding groove 137 as the included angle between the first connecting rod 133 and the support rod 134 changes.

[0164] The moving mechanism 13 further comprises a second connecting rod 136. In the radial direction of the needle body 11, the needle element 111 has an outer peripheral surface and an inner wall surface facing each other, and the third sliding groove 137 is formed on the inner wall surface. One end of the second connecting rod 136 is slidingly connected to the third sliding groove 137, the other end of the second connecting rod 136 is hingedly connected to the support rod 134, and the middle section of the second connecting rod 136 is hingedly connected to the first connecting rod 133.

[0165] In a specific embodiment, continuing to refer to Figure 9 , the middle position of the first connecting rod 133 is hingedly connected to the middle position of the second connecting rod 136. The third sliding groove 137 is formed on the inner wall surface of the needle element 111, and the third sliding groove 137 is away from the support disc 10. A sliding block capable of sliding along the third sliding groove 137 is arranged in the third sliding groove 137, and one end of the second connecting rod 136 is hingedly connected to the sliding block. The other end of the second connecting rod 136 is hingedly connected to the position of the support rod 134 close to the support disc 10. One end of the first connecting rod 133 is hingedly connected to the sliding cylinder 135, and the other end of the first connecting rod 133 is hingedly connected to the position of the inner wall surface of the needle element 111 close to the support disc 10.

[0166] Thus, when the first connecting rod 133 drives the needle roller 111 to move, the second connecting rod 136 slides in the third sliding groove 137 and drives the needle roller 111 in the same direction, and the slidable needle roller 111 can slide under the joint pushing and pulling of the first connecting rod 133 and the second connecting rod 136, the force on the needle roller 111 is balanced, the movement is stable, and the probability of tilting of the needle roller relative to the support disc 10 and the risk of sliding smoothly are reduced.

[0167] In some embodiments, as shown in Figures 9 to 11 The locking assembly 12 can include a locking groove 125 and an elastic locking protrusion 124. The support rod 134 is provided with a plurality of locking grooves 125 arranged at intervals along the extension direction of the support rod 134, and the inner wall of the sliding cylinder 135 is provided with an elastic locking protrusion 124. The elastic locking protrusion 124 is embedded in or separated from the locking groove 125 by elastic deformation.

[0168] The locking assembly 12 includes an elastic locking protrusion 124. The elastic locking protrusion 124 is arranged on the inner wall of the sliding cylinder 135. During the movement of the sliding cylinder 135, the elastic locking protrusion 124 is in a compressed state and can provide a large movement resistance. The sliding cylinder 135 can be fixed without external force through the resistance, and the needle roller 111 is locked. The elastic locking protrusion 124 is, for example, a plastic or rubber part.

[0169] Further, the elastic locking protrusion 124 can be provided in plurality, and the plurality of elastic locking protrusions 124 are arranged on the inner wall of the sliding cylinder 135 along the axis direction of the sliding cylinder 135.

[0170] The locking assembly 12 further includes a locking groove 125. The support rod 134 is provided with a plurality of locking grooves 125, and the plurality of locking grooves 125 are arranged at intervals along the extension direction of the support rod 134. When the elastic locking protrusion 124 moves to the locking groove 125, the elastic locking protrusion 124 is elastically deformed to extend into the locking groove 125 and is engaged with the locking groove 125, so as to fix the relative position of the sliding cylinder 135 and the support rod 134, thereby achieving the locking of the needle roller 111.

[0171] Thus, the elastic locking protrusion 124 can be engaged with the locking groove 125 when the sliding cylinder 135 moves to the locking groove 125, so as to fix the sliding cylinder 135 at a specific position, thereby achieving the locking of the needle roller 111. The locking can be released by applying a larger force to move the sliding cylinder 135. The structure is simple and convenient to operate.

[0172] In some embodiments, the locking groove 125 is arranged around part of the outer periphery of the support rod 134, and the support rod 134 is configured to rotate relative to the support disc 10. With the rotation of the support rod 134, the elastic locking protrusion 124 enters or exits the locking groove 125 along the peripheral surface of the support rod 134.

[0173] The locking groove 125 is arranged around the outer periphery of the support rod 134, but is not formed as a groove connecting the circumferential positions, but is formed as a shape in which the outer peripheral surface of the support rod 134 exists between the circumferential positions.

[0174] When the radial dimension of the winding needle body 11 needs to be adjusted, the support rod 134 is rotated to make the locking groove 125 on the support rod 134 avoid the moving path of the elastic locking protrusion 124, and then the sliding cylinder 135 is moved to the required position. When locking is required, the support rod 134 is rotated to make the locking groove 125 on the support rod 134 accommodate the elastic locking protrusion 124, so that the elastic locking protrusion 124 is clamped with the locking groove 125.

[0175] Therefore, the support rod 134 can be rotated to make the locking groove 125 avoid the moving path of the elastic locking protrusion 124, so that the sliding cylinder 135 can move smoothly. When locking is required, the support rod 134 is rotated to the position corresponding to the locking groove 125 and the elastic locking protrusion 124 and clamped to achieve locking.

[0176] In a second aspect, the application provides a winding machine, comprising a winding head and a winding needle as above, the winding needle being connected with the winding head and rotating under the driving of the winding head.

[0177] Since the winding machine adopts the winding needle with variable diameter, the winding machine can be suitable for producing different sizes of battery cells, has wide applicability, and does not need to replace the winding needle when winding different products, which helps to simplify the production steps and improve the production efficiency.

[0178] A specific embodiment of the application will be described below.

[0179] The winding needle comprises a support disc 10, a sun gear (rotation disc 132) and a plurality of winding needle pieces 111, the support disc 10 and the sun gear (rotation disc 132) can be arranged on the same side of the winding needle pieces 111 or respectively arranged on the two sides of the winding needle pieces 111, and each winding needle piece 111 can move relative to the sun gear (rotation disc 132) and the support disc 10. According to the required size of the winding needle for producing battery cells, the radial dimension of the winding needle is adjusted by rotating the sun gear (rotation disc 132), and then the width and thickness of the produced battery cells are changed, so that the winding needle can be suitable for the production of various battery cells.

[0180] Specifically, as Figure 5As shown, a support disc 10 is arranged on one side of the winding needle piece 111, and the support disc 10 is provided with a first sliding groove 101 for fixing and cooperating with the movement of the winding needle piece 111. The winding needle comprises a plurality of fan-shaped winding needle pieces 111, and a sun gear (rotating disc 132) is arranged on the other side of the winding needle piece 111. When the winding needle pieces 111 contact and abut each other, the diameter of the winding needle is the smallest. When the sun gear (rotating disc 132) is rotated, each fan-shaped winding needle piece 111 is driven to move outward, and when the rotation reaches the limit, the diameter of the winding needle is the largest. The positions of the support disc 10 and the sun gear (rotating disc 132) can also be located on the same side of the winding needle piece 111.

[0181] Optionally, as shown in Figure 8 and Figure 9 , the winding needle comprises a support disc 10, a sliding cylinder 135, a plurality of winding needle pieces 111 and a first connecting rod 133, and the support disc 10 is provided with a first sliding groove 101. The first connecting rod 133 is hingedly connected with the sliding cylinder 135 and the winding needle piece 111 respectively. By moving the sliding cylinder 135, the first connecting rod 133 is driven to move, and then the winding needle piece 111 moves along the first sliding rail, so as to change the diameter of the winding needle. At the same time of changing the diameter, the circular appearance of the winding needle can be maintained, the variable range of the circumference of the winding needle is large, and the structure has high reliability.

[0182] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. Such 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 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.

Claims

1. A reel pin, characterized in that, Comprising: a support disc configured to rotate about a rotation axis, the support disc being provided with a first sliding groove extending along a radial direction of the support disc; a winding needle body connected to the support disc and configured to rotate with the support disc, the winding needle body having an outer circumferential surface for winding a sheet, the winding needle body comprising at least two winding needle pieces, part or all of the winding needle pieces being respectively slidably connected to the first sliding groove, and sliding the winding needle pieces along the first sliding groove being capable of changing a circumference of the outer circumferential surface; a locking assembly for limiting a position of the winding needle pieces relative to the first sliding groove.

2. The winding needle according to claim 1, further comprising a moving mechanism connected to each of the winding needle pieces and configured to simultaneously drive each of the winding needle pieces to move towards or away from each other.

3. The winding needle according to claim 2, wherein the moving mechanism comprises a sliding member and a rotating disc capable of rotating relative to the winding needle body, the rotating disc being provided with a plurality of second sliding grooves, the sliding member being connected to each of the winding needle pieces and slidably connected to the support disc and the rotating disc, and the sliding member being driven to slide along the second sliding grooves and the first sliding groove with rotation of the rotating disc, and the sliding member driving each of the winding needle pieces to move towards or away from each other.

4. The winding needle according to claim 3, wherein the second sliding grooves are formed in a spiral shape and uniformly arranged around the rotation axis.

5. The winding needle according to claim 3, wherein the support disc and the rotating disc are arranged on opposite sides of the winding needle body along the rotation axis, the sliding member comprises a first sliding connection portion and a second sliding connection portion protruding from two ends of the winding needle body, the first sliding connection portion is slidably connected to the first sliding groove, and the second sliding connection portion is slidably connected to the second sliding groove.

6. The winding needle according to claim 4, wherein the support disc and the rotating disc are arranged on opposite sides of the winding needle body along the rotation axis, the sliding member comprises a first sliding connection portion and a second sliding connection portion protruding from two ends of the winding needle body, the first sliding connection portion is slidably connected to the first sliding groove, and the second sliding connection portion is slidably connected to the second sliding groove.

7. The winding needle according to claim 3, wherein the support disc and the rotating disc are arranged on the same side of the winding needle body along the rotation axis, the sliding member comprises a first sliding connection portion and a second sliding connection portion protruding from one end of the winding needle body, the first sliding connection portion is slidably connected to the first sliding groove, and the second sliding connection portion is slidably connected to the second sliding groove.

8. The winding needle according to claim 4, wherein ​ ​ ​ ​ ​ ​ ​ The support disc and the rotating disc are installed on the same side of the needle body along the direction of the rotation axis, the sliding member comprises a first sliding connecting part and a second sliding connecting part protruding from one end of the needle body, the first sliding connecting part is slidingly connected to the first sliding groove, and the second sliding connecting part is slidingly connected to the second sliding groove.

9. The needle according to any one of claims 5 to 8, characterized in that, in the same projection plane perpendicular to the rotation axis, the projection of the first sliding groove and the projection of the second sliding groove always have an overlapping part with the rotation of the rotating disc, the first sliding connecting part and the second sliding connecting part are integrally connected, and the sliding member penetrates through the first sliding groove and the second sliding groove.

10. The needle according to claim 5 or 6, characterized in that, the first sliding connecting part and the second sliding connecting part are separately arranged along the direction of the rotation axis, the first sliding connecting part and the second sliding connecting part arranged on the same needle member are spaced in the radial direction of the needle body.

11. The needle according to any one of claims 3 to 8, characterized in that, the sliding member further comprises a first limiting part and a second limiting part, the first limiting part and the second limiting part are respectively connected to the two ends of the sliding member along the direction of the rotation axis, at least a part of the support disc and at least a part of the rotating disc are located between the first limiting part and the second limiting part along the direction of the rotation axis, and the support disc abuts against the first limiting part, and the rotating disc abuts against the second limiting part; in the same projection plane perpendicular to the rotation axis, the projection of the support disc partially overlaps with the projection of the first limiting part, and the projection of the rotating disc partially overlaps with the projection of the second limiting part.

12. The needle according to any one of claims 3 to 8, characterized in that, the locking assembly comprises a locking member, a locking matching part and a locking retaining member, the rotating disc is provided with a plurality of locking matching parts, the locking member is arranged on the needle body and is configured to be able to move back and forth between a locking position and an unlocking position relative to the rotating disc, and the locking retaining member is arranged on at least one of the rotating disc and the needle body, and is used for retaining the relative position of the locking member and the locking matching part, in the locking position, the locking member is engaged with the locking matching part to limit the relative movement between the rotating disc and the needle body.

13. The needle according to claim 12, characterized in that, the circumferential edge of the rotating disc is configured with a plurality of notches as the locking matching parts, the locking assembly further comprises a limiting groove extending in the radial direction of the needle body, the locking member is slidingly connected to the limiting groove, in the locking position, the locking member at least partially enters the notch, and in the unlocking position, the locking member exits the notch.

14. The needle according to any one of claims 3 to 8, characterized in that, the moving mechanism further comprises a handle, and the handle is arranged on the rotating disc.

15. The winding needle according to claim 2, wherein the moving mechanism comprises a first connecting rod, a supporting rod arranged at the center of the supporting disc, and a sliding cylinder sleeved on the supporting rod, two ends of the first connecting rod are hingedly connected to the sliding cylinder and the winding needle part that is slidable, respectively, and as the sliding cylinder slides on the supporting rod, the included angle between the first connecting rod and the supporting rod changes, and the first connecting rod drives the winding needle part that is slidable to slide along the first sliding groove to approach or move away from each other.

16. The winding needle according to claim 15, wherein the moving mechanism further comprises a second connecting rod hingedly connected to the first connecting rod, and a side of the winding needle part along the radial direction towards the supporting rod is provided with a third sliding groove extending along the direction of the rotation axis, one end of the second connecting rod is in sliding connection with the third sliding groove, the other end of the second connecting rod is hingedly connected to the supporting rod, and as the included angle between the first connecting rod and the supporting rod changes, the one end of the second connecting rod slides along the third sliding groove.

17. The winding needle according to claim 15, wherein the locking assembly comprises a locking groove and an elastic locking protrusion, the supporting rod is provided with a plurality of locking grooves arranged at intervals along the extension direction of the supporting rod, an inner wall of the sliding cylinder is provided with the elastic locking protrusion, and the elastic locking protrusion is embedded in or out of the locking groove by elastic deformation.

18. The winding needle according to claim 17, wherein the locking groove is arranged around part of the outer circumference of the supporting rod, the supporting rod is configured to be able to rotate relative to the supporting disc, and as the supporting rod rotates, the elastic locking protrusion enters or exits the locking groove along the circumferential surface of the supporting rod.

19. The winding needle according to claim 1, wherein the winding needle part comprises an arc-shaped peripheral wall.

20. The winding needle according to claim 19, wherein the winding needle part further comprises an end wall connected to one end or both ends of the arc-shaped peripheral wall along the direction of the rotation axis. a winding head and the winding needle according to any one of claims 1 to 20, the winding needle being connected to the winding head and rotating under the drive of the winding head. ​ ​ ​ ​ ​ 21. A winding machine, characterized by ​

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