Winding needle mechanism and winding device

Abstract

A winding needle mechanism (100) and a winding device. The winding needle mechanism (100) comprises a winding needle main body (10) and a winding needle unit (20), wherein the winding needle main body (10) is arranged to be capable of rotating around its own axis. The winding needle main body (10) is provided with fixing needles (11) extending lengthwise in the axial direction (X) of the winding needle main body (10). The winding needle unit (20) comprises: adjusting assemblies (21), wherein each adjusting assembly (21) comprises a moving member (211), a first sliding block (212) and a first transmission member (213), the moving member (211) is movably connected to the corresponding fixing needle (11) in the axial direction (X) of the winding needle main body (10), the first sliding block (212) is movably connected to the corresponding fixing needle (11) in the radial direction of the winding needle main body (10), and the first transmission member (213) is located on one side of the corresponding fixing needle (11) in the width direction, and is in transmission connection with the first sliding block (212) and the moving member (211), so that when the moving member (211) moves in the axial direction (X) of the winding needle main body (10), the movement of the first sliding block (212) in the radial direction of the winding needle main body (10) can be driven by means of the first transmission member (213); and winding needle shells (23) each fixedly connected to the corresponding first sliding block (212).

Description

Needle winding mechanism and winding device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 27, 2023, with application number 202321645090.0 and application name “Winding Needle Mechanism and Winding Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of battery manufacturing equipment, and in particular to a winding needle mechanism and a winding device. Background Art

[0003] During lithium battery production, the cell is formed by winding the separator and positive and negative electrode sheets using a winding mechanism. Because the winding diameter of the winding mechanism is related to the alignment of the electrode tabs and the size of the cell, the winding diameter directly affects the quality of the cell. Therefore, winding mechanisms with adjustable winding diameters have been developed.

[0004] However, a large number of components need to be added to the winding needle mechanism to adjust the winding diameter. Since the space inside the winding needle mechanism is limited, the size of the fixed needle that mainly plays a supporting role in the winding needle mechanism needs to be reduced. The reduction in the size of the fixed needle greatly reduces the bending moment resistance of the winding needle mechanism, resulting in the inability to carry larger battery cells, that is, it is not compatible with the winding production of larger cores.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a winding needle mechanism and a winding device that improve the above defects in order to solve the problem that the winding needle mechanism in the prior art has poor bending moment resistance and cannot be compatible with the winding of larger-sized winding cores.

[0007] A needle winding mechanism, comprising:

[0008] A winding needle body is rotatably arranged around its own axis, and the winding needle body has a fixed needle extending longitudinally along the axial direction of the winding needle body; and

[0009] Needle winding unit, including:

[0010] The adjusting assembly includes a moving member, a first slider, and a first transmission member; the moving member is movably connected to the fixed needle along the axial direction of the winding needle body, and the first slider is movably connected to the fixed needle along the radial direction of the winding needle body; the first transmission member is located on one side of the fixed needle in the width direction, and is transmission-connected to the first slider and the moving member, so that when the moving member moves along the axial direction of the winding needle body, the first slider can be driven by the first transmission member to move along the radial direction of the winding needle body;

[0011] The winding needle housing is fixedly connected to the first sliding block.

[0012] In one embodiment, the fixing needle has a first side surface, a second side surface, a third side surface, and a fourth side surface; the first side surface and the second side surface respectively serve as two side surfaces of the fixing needle in the radial direction of the winding needle body, and the third side surface and the fourth side surface are both connected between the first side surface and the second side surface and face away from each other in the width direction of the fixing needle;

[0013] The first transmission member is located on the side of the fixed needle having the third side surface and / or the side of the fixed needle having the fourth side surface.

[0014] In one embodiment, at least two first sliders and at least two first transmission members are arranged on the side of the fixed needle having the third side surface and / or the side having the fourth side surface, the first sliders located on the same side of the fixed needle are spaced apart along the longitudinal extension direction of the fixed needle, the first transmission members and the first sliders located on the same side of the fixed needle are transmission-connected one-to-one, and the winding needle housing is fixedly connected to the first sliders.

[0015] In one embodiment, the adjustment assembly further includes a first mounting shaft, and the movable member is provided inside the fixed needle along the axial direction of the winding needle body;

[0016] One end of the first installation shaft is installed on the moving member, and the other end of the first installation shaft passes through the third side surface or the fourth side surface and is connected to the first transmission member.

[0017] In one embodiment, the adjustment assembly further includes a second slider and a second transmission member, wherein the second slider is movably connected to the fixed needle along the radial direction of the winding needle body, and the second transmission member is transmission-connected to both the second slider and the moving member, so that when the moving member moves along the axial direction of the winding needle body, the second slider can be driven by the second transmission member to move along the radial direction of the winding needle body;

[0018] The winding needle unit further comprises an inner clamping needle fixedly connected to the second slider, and the inner clamping needle can be used to clamp or release the material strip when following the second slider and moving along the radial direction of the winding needle body.

[0019] In one embodiment, the second transmission member is located on one side of the fixed needle in the width direction.

[0020] In one embodiment, the fixing needle has a first side surface, a second side surface, a third side surface, and a fourth side surface; the first side surface and the second side surface respectively serve as two side surfaces of the fixing needle in the radial direction of the winding needle body, and the third side surface and the fourth side surface are both connected between the first side surface and the second side surface and face away from each other in the width direction of the fixing needle;

[0021] The second transmission member is located on the side of the fixed needle having the third side surface and / or the side of the fixed needle having the fourth side surface.

[0022] In one embodiment, at least two second sliding blocks and at least two second transmission members are arranged on the side of the fixed needle having the third side surface and / or the side having the fourth side surface;

[0023] The second sliders located on the same side of the fixed needle are spaced apart along the longitudinal extension direction of the fixed needle; the second transmission members located on the same side of the fixed needle are transmission-connected to the second sliders one by one, and the inner clamping needle is fixedly connected to the second sliders.

[0024] In one embodiment, the adjustment assembly further includes a second mounting shaft, and the movable member is provided inside the fixed needle along the axial direction of the winding needle body;

[0025] One end of the second installation shaft is installed on the moving member, and the other end of the second installation shaft passes through the third side surface or the fourth side surface and is connected to the second transmission member.

[0026] In one embodiment, the number of the fixed needles is two, and the two fixed needles are arranged opposite to each other along the radial direction of the winding needle body;

[0027] The two winding needle units are provided with two, respectively, the two winding needle units are provided on the two fixed needles, the two winding needle shells are respectively located on the periphery of the two fixed needles, and a slit for the feed tape to enter is formed between the two winding needle shells, and the two inner clamping needles are located between the two fixed needles and are used to clamp the material tape entering the slit.

[0028] In one embodiment, the needle winding mechanism further includes a first material strip clamping plate and a second material strip clamping plate, wherein the first material strip clamping plate and the second material strip clamping plate are respectively fixedly connected to the two inner clamping needles and extend radially along the needle winding body within the slit;

[0029] The first material strip clamping plate and the second material strip clamping plate are spaced apart from each other for allowing the material strip to enter.

[0030] In one embodiment, the gap between the first material strip clamping plate and the second material strip clamping plate is larger than the gap between the two inner clamping needles.

[0031] A winding device comprises the winding needle mechanism as described in any of the above embodiments.

[0032] In the aforementioned winding needle mechanism and winding device, the outer surface of the winding needle housing serves as a portion of the winding surface for winding the strip. Specifically, when the winding needle body rotates about its own axis, the strip can be wound around the outer surface of the winding needle housing to form a battery cell. To adjust the winding diameter of the winding needle mechanism, an external force can be used to drive a movable member axially along the winding needle body. This allows the movable member, via a first transmission member, to drive a first slider radially along the winding needle body, which in turn drives the winding needle housing radially along the winding needle body, thereby adjusting the winding diameter of the winding needle mechanism. Furthermore, because the first transmission member is located to one side of the fixed needle in the width direction, it does not occupy space radially of the fixed needle body (i.e., in the thickness direction of the fixed needle). This allows the fixed needle's radial dimension (i.e., its thickness dimension) to be maximized, thereby significantly improving the fixed needle's bending moment resistance and, by extension, the bending moment resistance of the winding needle mechanism. This facilitates compatibility with larger-sized winding needles, thereby enhancing the compatibility of the winding needle mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic structural diagram of a needle winding mechanism according to an embodiment of the present application;

[0034] FIG2 is a front view of the needle winding mechanism shown in FIG1 (with the inner needle clamped and the needle winding housing omitted);

[0035] FIG3 is a top view of the needle winding mechanism shown in FIG2 ;

[0036] FIG4 is a front view of the needle winding mechanism shown in FIG1 (the inner clamping needle is released and the needle winding housing is omitted);

[0037] FIG5 is a schematic diagram of a partial structure of the needle winding mechanism shown in FIG1 ;

[0038] FIG6 is a cross-sectional view of the needle winding mechanism shown in FIG1 (the needle winding housing is omitted);

[0039] FIG7 is a schematic diagram of the assembly structure of the fixed needle and the moving part of the needle winding mechanism shown in FIG1 ;

[0040] FIG8 is a schematic structural diagram of the needle winding mechanism shown in FIG1 from another perspective;

[0041] FIG9 is a schematic diagram of the assembly structure of the two inner clamping needles of the needle winding mechanism shown in FIG1 and the first material strip clamping plate and the second material strip clamping plate;

[0042] FIG10 is a schematic structural diagram of a winding device in one embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

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

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0046] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0047] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0049] Referring to Figures 1 to 4 , one embodiment of the present application provides a winding needle mechanism 100 for winding a material strip d (see Figure 10 ) to form a battery cell. The winding needle mechanism 100 includes a winding needle body 10 and a winding needle unit 20 . The winding needle body 10 is rotatable about its axis. The winding needle body 10 has a fixed needle 11 extending longitudinally along the axial direction X of the winding needle body 10 , and the winding needle unit 20 is disposed on the fixed needle 11 .

[0050] The needle winding unit 20 includes an adjustment component 21 and a needle winding housing 23. The adjustment component 21 includes a moving part 211, a first slider 212 and a first transmission part 213. The moving part 211 is movably connected to the fixed needle 11 along the axial direction X of the needle winding body 10. The first slider 212 is movably connected to the fixed needle 11 along the radial direction of the needle winding body 10. The needle winding housing 23 is fixedly connected to the first slider 212, so that the needle winding housing 23 follows the first slider 212 to move relative to the fixed needle 11 along the radial direction of the needle winding body 10 to increase or decrease the winding diameter of the needle winding mechanism 100. The first transmission part 213 is located on one side of the fixed needle 11 in the width direction Y, and is transmission-connected to the first slider 212 and the moving part 211, so that when the moving part 211 moves along the axial direction X of the needle winding body 10, it can drive the first slider 212 to move along the radial direction of the needle winding body 10 through the first transmission part 213.

[0051] It should be noted that the above-mentioned fixed needle 11 plays the role of supporting the various components of the winding needle unit 20 and the battery cells wound on the winding needle housing 23. Therefore, the bending moment resistance of the fixed needle 11 directly determines the bending moment resistance of the winding needle mechanism 100, and the bending moment resistance of the winding needle mechanism 100 determines the ability to adapt to the winding and forming of battery cells with larger sizes.

[0052] In the aforementioned winding needle mechanism 100, the outer surface of the winding needle housing 23 serves as part of the winding surface for winding the strip d. Specifically, when the winding needle body 10 rotates about its axis, it can cause the strip d to be wound around the outer surface of the winding needle housing 23 to form a battery cell. To adjust the winding diameter of the winding needle mechanism 100, an external force is applied to move the movable member 211 along the axial direction X of the winding needle body 10. This allows the movable member 211, via the first transmission member 213, to move the first slider 212 radially along the winding needle body 10. This, in turn, causes the first slider 212 to move the winding needle housing 23 radially along the winding needle body 10, thereby adjusting the winding diameter of the winding needle mechanism 100. Moreover, since the first transmission member 213 is located on one side of the fixed needle 11 in the width direction Y, it will not occupy the space of the fixed needle 11 in the radial direction of the winding needle body 10 (that is, the thickness direction Z of the fixed needle 11), so that the size of the fixed needle 11 in the radial direction of the winding needle body 10 (that is, the thickness size of the fixed needle 11) can be increased as much as possible, thereby greatly improving the bending moment resistance of the fixed needle 11, and further greatly improving the bending moment resistance of the winding needle mechanism 100, which is conducive to compatibility with the winding of larger-sized winding needles, that is, improving the compatibility of the winding needle mechanism 100.

[0053] It should be noted that in order to be compatible with the production of battery cells of different sizes, the winding needle housing 23 of the corresponding size can be replaced according to the size of the battery cell to be produced. Since the fixed needle 11 in this application has a strong bending moment resistance, it is compatible with the production of both smaller and larger battery cells.

[0054] It can be understood that the length direction of the fixing needle 11 is the axial direction X of the winding needle body 10, the thickness direction Z of the fixing needle 11 is the radial direction of the winding needle body 10, and the width direction Y of the fixing needle 11 is roughly perpendicular to the length direction and thickness direction Z of the fixing needle 11.

[0055] Specifically, in this embodiment, the fixed needle 11 has a first side surface d1, a second side surface d2, a third side surface d3, and a fourth side surface d4. The first side surface d1 and the second side surface d2 serve as the radially opposite side surfaces of the fixed needle 11, respectively, in the winding needle body 10. The third side surface d3 and the fourth side surface d4 are connected between the first side surface d1 and the second side surface d2 and face away from each other in the width direction Y of the fixed needle 11. The first transmission member 213 is located on the side of the fixed needle 11 with the third side surface d3 and / or the side with the fourth side surface d4. In other words, the first transmission member 213 can be located only on the side of the fixed needle 11 with the third side surface d3, only on the side of the fixed needle 11 with the fourth side surface d4, or both on the side of the fixed needle 11 with the third side surface d3 and the side with the fourth side surface d4.

[0056] Specifically in this embodiment, at least two first sliders 212 and at least two first transmission members 213 are arranged on the side of the fixed needle 11 having the third side d3 or the side having the fourth side d4. Of course, in other embodiments, at least two first sliders 212 and at least two first transmission members 213 may be arranged on both the side having the third side d3 and the side having the fourth side d4.

[0057] The first sliders 212 located on the same side of the fixed needle 11 are spaced apart along the longitudinal extension direction of the fixed needle 11. The first transmission members 213 located on the same side of the fixed needle 11 are connected to the first sliders 212 in a one-to-one transmission connection. The winding needle housing 23 is fixedly connected to each first slider 212 so as to move with each first slider 212. Thus, the winding needle housing 23 is mounted using multiple first sliders 212 spaced apart along the longitudinal extension direction of the fixed needle 11 (i.e., the axial direction X of the winding needle body 10), making the installation of the winding needle housing 23 more stable and reliable, and following the radial movement of each first slider 212 along the winding needle body 10 more stable and reliable.

[0058] It should be noted that, compared with the prior art which uses a strip-shaped slider extending longitudinally along the axial direction X of the winding needle body 10, the present application uses at least two first sliders 212 arranged at intervals, which has a simpler structure and requires less space, which is conducive to increasing the size of the fixed needle 11 and further improving the bending moment resistance of the fixed needle 11.

[0059] Furthermore, at least two first sliders 212 located on the same side of the fixed needle 11 are spaced apart along the longitudinal extension direction of the fixed needle 11. Each first slider 212 located on one side of the fixed needle 11 corresponds one-to-one with each first slider 212 located on the other side of the fixed needle 11, and the two corresponding first sliders 212 are fixedly connected by a fixing block 217. Optionally, the two corresponding first sliders 212 and the fixing block 217 therebetween can be integrally formed.

[0060] Specifically, in the embodiments shown in Figures 2 to 5, the fixed needle 11 is provided with two first sliders 212 on the side with the third side d3 and the side with the fourth side d4. The fixed needle 11 is provided with two first transmission members 213 on the side with the third side d3 and the side with the fourth side d4. Each first transmission member 213 is transmission-connected to the moving member 211, and is transmission-connected to each first slider 212 in a one-to-one correspondence, so that when the moving member 211 moves along the axial direction X of the winding needle body 10, each first transmission member 213 can drive each first slider 212 to move synchronously along the radial direction of the winding needle body 10, and then each first slider 212 jointly drives the winding needle housing 23 to move along the radial direction of the winding needle body 10, so as to achieve the adjustment of the winding diameter of the winding needle mechanism 100.

[0061] Specifically, in this embodiment, the movable member 211 is disposed axially within the fixed needle 11 along the winding needle body 10 and is capable of sliding within the fixed needle 11 along the axial direction of the winding needle body 10. The adjustment assembly 21 also includes a first mounting shaft 218. One end of the first mounting shaft 218 is mounted on the movable member 211, and the other end of the first mounting shaft 218 extends through the third side surface d3 or the fourth side surface d4 and is connected to the first transmission member 213.

[0062] Furthermore, the fixed needle 11 is provided with a first avoidance groove b8 (see FIG7 ) for the first mounting shaft 218 to pass through. Thus, the first avoidance groove b8 can play a role in avoiding the first mounting shaft 218 and avoid interfering with the first mounting shaft 218 following the moving member 211 along the axial movement of the winding needle body 10.

[0063] Specifically, in this embodiment, the first transmission member 213 is a first roller, which is rotatably connected to the movable member 211 via a first mounting shaft 218. A first groove b1 is defined on the first slider 212, within which the first roller rolls, allowing the first roller to roll along the groove b1. The groove b1 extends longitudinally in a direction oblique to the axial direction X of the winding needle body 10. This allows the movable member 211 to simultaneously drive the first roller along the axial direction X of the winding needle body 10 while the first roller rolls along the groove b1, thereby driving the first slider 212 to move radially relative to the fixed needle 11 along the winding needle body 10.

[0064] As shown in Figure 7 , the fixed needle 11 further defines a first guide groove b4. A first slider 212 is disposed within this first guide groove b4, and a plurality of first balls (not shown) are positioned between the first slider 212 and the inner wall of the first guide groove b4. This allows the first slider 212 to roll against the inner wall of the first guide groove b4 via the first balls. This arrangement not only allows the first slider 212, driven by the first roller, to move more smoothly along the radial direction of the winding needle body 10. Furthermore, the rolling friction between the first slider 212 and the inner wall of the first guide groove b4 reduces wear on the inner wall of the first guide groove b4 and extends its service life.

[0065] Please refer to Figures 2 to 4. In the embodiment of the present application, the adjustment assembly 21 also includes a second slider 214 and a second transmission member 215. The second slider 214 is movably connected to the fixed needle 11 along the radial direction of the winding needle body 10. The second transmission member 215 is transmission-connected to both the second slider 214 and the moving member 211, so that when the moving member 211 moves along the axial direction X of the winding needle body 10, it can drive the second slider 214 to move along the radial direction of the winding needle body 10 through the second transmission member 215. The winding needle mechanism 100 also includes an inner clamping needle 25 fixedly connected to the second slider 214. The inner clamping needle 25 can be used to clamp or release the material strip d when following the second slider 214 to move along the radial direction of the winding needle body 10.

[0066] Thus, before winding, the movable member 211 is controlled to move along the axial direction X of the winding needle body 10, thereby driving the second slider 214 to move radially along the winding needle body 10 through the second transmission member 215, and the second slider 214 then drives the inner clamping needle 25 to move radially along the winding needle body 10, so that the inner clamping needle 25 clamps and fixes the material strip d, so that the material strip d can be smoothly wound onto the winding needle housing 23 of the winding needle mechanism 100 during winding. After the winding of the battery cell is completed and before the battery cell on the winding needle mechanism 100 is unloaded, the movable member 211 is controlled to move along the axial direction X of the winding needle body 10, thereby driving the second slider 214 to move radially along the winding needle body 10 through the second transmission member 215, and the second slider 214 then drives the inner clamping needle 25 to move radially along the winding needle body 10, so that the inner clamping needle 25 releases the material strip d, so that the battery cell can be smoothly unloaded from the winding needle mechanism 100.

[0067] Furthermore, while the inner clamping needle 25 is gripping the strip d, the winding needle housing 23 moves radially along the winding needle body 10 and away from the rotation axis of the winding needle body 10 to increase the winding diameter of the winding needle mechanism 100. This means that while the strip d is connected to the winding needle mechanism 100, the winding diameter of the winding needle mechanism 100 is adjusted. Furthermore, when the inner clamping needle 25 releases the strip d, the winding needle housing 23 moves radially along the winding needle body 10 and closer to the rotation axis of the winding needle body 10 to reduce the winding diameter of the winding needle mechanism 100. This facilitates the separation of the battery cells wound on the winding needle mechanism 100 from the winding needle mechanism 100, thereby increasing the rate at which the winding needle mechanism 100 can perform its needle removal operation.

[0068] In some embodiments, the second transmission member 215 is located on one side of the fixed needle 11 in the width direction Y, so that the second transmission member 215 will not occupy the space of the fixed needle 11 in the radial direction of the winding needle body 10 (that is, the thickness direction Z of the fixed needle 11), so that the size of the fixed needle 11 in the radial direction of the winding needle body 10 (that is, the thickness size of the fixed needle 11) can be increased as much as possible, which is conducive to further improving the bending moment resistance of the fixed needle 11, and thus greatly improving the bending moment resistance of the winding needle mechanism 100, which is conducive to adapting to the winding of larger-sized winding needles, that is, improving the compatibility of the winding needle mechanism 100.

[0069] Specifically, in this embodiment, the second transmission member 215 is located on the side of the fixed needle 11 having the third side d3 and / or the side having the fourth side d4. In other words, the second transmission member 215 may be disposed only on the side of the fixed needle 11 having the third side d3; or only on the side of the fixed needle 11 having the fourth side d4; or both on the side of the fixed needle 11 having the third side d3 and the side having the fourth side d4.

[0070] Specifically in this embodiment, at least two second sliders 214 and at least two second transmission members 215 are arranged on the side of the fixed needle 11 having the third side d3 or the side having the fourth side d4. Of course, in other embodiments, at least two second sliders 214 and at least two second transmission members 215 may be arranged on both the side having the third side d3 and the side having the fourth side d4.

[0071] The second sliders 214 located on the same side of the fixed needle 11 are spaced apart along the longitudinal extension direction of the fixed needle 11. The second transmission members 215 located on the same side of the fixed needle 11 are transmission-connected to the second sliders 214 in a one-to-one correspondence. The inner clamping needle 25 is fixedly connected to each second slider 214. In this way, the inner clamping needle 25 is installed using multiple second sliders 214 spaced apart along the longitudinal extension direction of the fixed needle 11 (i.e., the axial direction X of the winding needle body 10), making the installation of the inner clamping needle 25 more stable and more reliable following the radial movement of each second slider 214 along the winding needle body 10.

[0072] It should be noted that, compared with the prior art which uses a strip-shaped slider extending longitudinally along the axial direction X of the winding needle body 10, the present application uses at least two second sliders 214 arranged at intervals, which has a simpler structure and requires less space, which is conducive to increasing the size of the fixed needle 11 and further improving the bending moment resistance of the fixed needle 11.

[0073] Furthermore, at least two second sliders 214 on the same side of the fixed needle 11 are spaced apart along the longitudinal extension direction of the fixed needle 11. Each second slider 214 on one side of the fixed needle 11 is arranged in a one-to-one correspondence with each second slider 214 on the other side of the fixed needle 11.

[0074] Specifically, in the embodiment shown in FIG2 , the fixed needle 11 is provided with two second sliders 214 on the side with the third side d3 and the side with the fourth side d4. The fixed needle 11 is provided with two second transmission members 215 on the side with the third side d3 and the side with the fourth side d4. Each second transmission member 215 is transmission-connected to the moving member 211 and is transmission-connected to each second slider 214 in a one-to-one correspondence, so that when the moving member 211 moves along the axial direction X of the winding needle body 10, each second transmission member 215 can drive each second slider 214 to move synchronously along the radial direction of the winding needle body 10, and then each second slider 214 can jointly drive the inner clamping needle 25 to move along the radial direction of the winding needle body 10 to achieve clamping or loosening of the material strip d.

[0075] Specifically, in this embodiment, the movable member 211 is disposed axially within the fixed needle 11 along the winding needle body 10 and is capable of sliding within the fixed needle 11 along the axial direction of the winding needle body 10. The adjustment assembly 21 also includes a second mounting shaft 219. One end of the second mounting shaft 219 is mounted on the movable member 211, and the other end of the second mounting shaft 219 extends through the third side surface d3 or the fourth side surface d4 and is connected to the second transmission member 215.

[0076] Furthermore, the fixed needle 11 is provided with a second avoidance groove b9 (see FIG7 ) for the second mounting shaft 219 to pass through. Thus, the second avoidance groove b9 can play a role in avoiding the second mounting shaft 219 and avoid interfering with the axial movement of the second mounting shaft 219 following the moving member 211 along the winding needle body 10.

[0077] Specifically, in this embodiment, the second transmission member 215 is a second roller, rotatably connected to the movable member 211 via a second mounting shaft 219. A second chute b2 is defined on the second slider 214, into which the second roller rolls, allowing the second roller to roll along the second chute b2. The second chute b2 extends longitudinally in a direction oblique to the axial direction X of the winding needle body 10. This allows the movable member 211 to simultaneously drive the second roller along the axial direction X of the winding needle body 10 while the second roller rolls along the second chute b2, thereby driving the second slider 214 to move radially relative to the fixed needle 11 along the winding needle body 10.

[0078] As shown in Figure 7 , the fixed needle 11 further defines a second guide groove b5, within which a second slider 214 is disposed. Multiple second balls (not shown) are positioned between the second slider 214 and the inner wall of the second guide groove b5. This allows the second slider 214 to roll against the inner wall of the second guide groove b5 via the second balls. This arrangement, driven by the second roller, allows the second slider 214 to move more smoothly along the radial direction of the winding needle body 10. Furthermore, rolling friction between the second slider 214 and the inner wall of the second guide groove b5 reduces wear on the inner wall of the second guide groove b5 and extends its service life.

[0079] Referring to Figures 1 to 4 , in the embodiment of the present application, two fixed pins 11 are provided, arranged radially opposite each other along the winding needle body 10. Two winding needle units 20 are provided, one on each of the fixed pins 11. Two winding needle housings 23 are positioned around the periphery of the two fixed pins 11, such that the outer surfaces of the two winding needle housings 23 combine to form a generally circular or elliptical winding surface. When the winding needle body 10 rotates, the material strip d is wound onto this winding surface to form a battery cell. The winding diameter of the winding needle mechanism 100 is the diameter of this winding surface.

[0080] A slit a for the material supply tape d to enter is formed between the two winding needle housings 23. Two inner clamping needles 25 are located between the two fixed needles 11 and are used to clamp the material tape d entering the slit a.

[0081] Please refer to Figure 2. When it is necessary to clamp the material strip d entering the slit a, the moving members 211 on the two fixed needles 11 are controlled to move to the left, so that the two moving members 211 respectively drive the first sliders 212 on the two fixed needles 11 away from each other (i.e., away from each other in the radial direction of the winding needle body 10), thereby driving the two winding needle housings 23 away from each other in the radial direction of the winding needle body 10 to increase the winding diameter of the winding needle mechanism 100. At the same time, the two moving members 211 respectively drive the second sliders 214 on the two fixed needles 11 closer to each other (i.e., closer to each other in the radial direction of the winding needle body 10), thereby driving the two inner clamping needles 25 closer to each other in the radial direction of the winding needle body 10, so that the two inner clamping needles 25 clamp the material strip d entering the slit a.

[0082] Please refer to Figure 4. When it is necessary to release the material strip d entering the slit a, the moving members 211 on the two fixed needles 11 are controlled to move to the right, so that the two moving members 211 respectively drive the first sliders 212 on the two fixed needles 11 to approach each other (i.e., approach each other along the radial direction of the winding needle body 10), thereby driving the two winding needle housings 23 to approach each other along the radial direction of the winding needle body 10, so as to reduce the winding diameter of the winding needle mechanism 100. At the same time, the two moving members 211 respectively drive the second sliders 214 on the two fixed needles 11 to move away from each other (i.e., move away from each other along the radial direction of the winding needle body 10), thereby driving the two inner clamping needles 25 to move away from each other along the radial direction of the winding needle body 10, so that the two inner clamping needles 25 release the material strip d entering the slit a.

[0083] Please refer to Figures 8 and 9. Specifically in the embodiment, the needle winding mechanism 100 also includes a first material strip clamp 219a and a second material strip clamp 219b. The first material strip clamp 219a and the second material strip clamp 219b are respectively fixedly connected to the two inner clamping needles 25, and both extend radially along the needle winding body 10 in the slit a. The first material strip clamp 219a and the second material strip clamp 219b are spaced apart from each other to allow the material strip d to enter. In this way, when the two inner clamping needles 25 approach each other and clamp the material strip d entering the slit a, they can drive the first material strip clamp 219a and the second material strip clamp 219b to approach each other, thereby limiting the material strip d between the first material strip clamp 219a and the second material strip clamp 219b. After the material strip d is cut off downstream of the winding needle mechanism 100, the first material strip clamp 219a and the second material strip clamp 219b limit the material strip d, which greatly reduces the swing range of the cut end d1 of the material strip d (see Figure 10), so that the cut end d1 of the material strip d can be reliably wound around the outer surface of the winding needle housing 23 when the winding needle body 10 rotates.

[0084] Furthermore, the gap between the first material strip clamping plate 219a and the second material strip clamping plate 219b is larger than the gap between the two inner clamping needles 25. In this way, when the two inner clamping needles 25 are not clamped, the gap between the first material strip clamping plate 219a and the second material strip clamping plate 219b is large enough to facilitate the material strip d entering the slit a to smoothly enter between the first material strip clamping plate 219a and the second material strip clamping plate 219b; when the two inner clamping needles 25 clamp the material strip d, the first material strip clamping plate 219a and the second material strip clamping plate 219b do not completely clamp the material strip d, but only serve to limit the swing amount of the material strip d.

[0085] Please refer to Figures 2, 6 and 7. In the embodiment of the present application, the winding needle body 10 further includes a rotating seat 12, which is rotatably arranged around the axis of the winding needle body 10. One end of the two fixed needles 11 is fixedly connected to the rotating seat 12 and extends longitudinally along the axial direction X of the winding needle body 10. The two fixed needles 11 are arranged radially opposite to each other along the winding needle body 10, and the rotation axis of the winding needle body 10 is located between the two fixed needles 11. In this way, when winding is required, the rotating seat 12 is controlled to rotate, thereby driving the two fixed needles 11 and the winding needle housing 23 on the two fixed needles 11 to rotate, so that the material strip d is wound on the two winding needle housings 23 to form a battery cell.

[0086] Specifically, in this embodiment, a guide groove b3 is defined on the fixed needle 11 and extends along the axial direction X of the winding needle body 10. A support wheel 216 is rotatably connected to the movable member 211, which rolls within the guide groove b3. Thus, when an external force acts on the movable member 211, the movable member 211 drives the support wheel 216 to roll along the guide groove b3. In other words, the movable member 211 moves along the axial direction X of the winding needle body 10 under the guidance of the guide groove b3.

[0087] Optionally, there are multiple guide grooves b3, which are spaced apart along the longitudinal extension direction of the fixed needle 11. There are also multiple support wheels 216, which are rollingly engaged with the multiple guide grooves b3 in a one-to-one correspondence.

[0088] Furthermore, the adjustment assembly 21 also includes a reset elastic member 218 (see Figure 6). One end of the reset elastic member 218 abuts against one end of the moving member 211 close to the rotating seat 12, and the other end of the reset elastic member 218 abuts against the fixed needle 11. In this way, when the moving member 211 moves along the axial direction X of the needle winding mechanism 100 and toward the rotating seat 12 under the action of an external force, the reset elastic member 218 is further compressed. When the external force disappears, the moving member 211 moves along the axial direction X of the needle winding body 10 and away from the rotating seat 12 under the action of the elastic force provided by the reset elastic member 218 and resets. Optionally, the reset elastic member 218 can be a spring.

[0089] Specifically, in the embodiment shown in FIG6 , when the ends of the two movable members 211 facing away from the rotating base 12 are subjected to external force, the movable members 211 move leftward (the return spring 218 is further compressed), thereby driving the two winding needle housings 23 away from each other, thereby increasing the winding diameter of the winding needle mechanism 100, and simultaneously driving the two inner clamping needles 25 toward each other, thereby clamping the material strip d entering the slit a. When the external force on the ends of the two movable members 211 facing away from the rotating base 12 disappears, the two movable members 211 move rightward under the elastic force of the corresponding return spring 218, thereby driving the two winding needle housings 23 toward each other, thereby reducing the winding diameter of the winding needle mechanism 100, and simultaneously driving the two inner clamping needles 25 away from each other, thereby releasing the material strip d in the slit a.

[0090] Based on the aforementioned winding needle mechanism 100, the present application also provides a winding device. As shown in Figure 10, the winding device includes a turret 200 and a winding needle mechanism 100 as described in any of the above embodiments. The winding needle mechanism 100 is mounted on the turret 200. The turret 200 is capable of driving the winding needle mechanism 100 to rotate, thereby winding the material strip d onto the winding needle mechanism 100 to form a battery cell. The turret 200 is also capable of driving the winding needle mechanism 100 to orbit between various workstations to complete processes such as winding, finishing, gluing, and unloading.

[0091] For example, the turret 200 can drive the winding needle mechanism 100 to revolve to the winding station c1, where the winding needle mechanism 100 winds the material strip d and forms a battery cell. The turret 200 can also drive the winding needle mechanism 100 to revolve to the finishing and gluing station c2, where the battery cell on the winding needle mechanism 100 is glued, so that the tail end of the material strip d is adhered to the outer surface of the battery cell, preventing the layers of the material strip d from loosening. The turret 200 can also drive the winding needle mechanism 100 to revolve to the unloading station c3, where the battery cell on the winding needle mechanism 100 is unloaded.

[0092] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A needle winding mechanism, characterized in that: include: The winding needle body is rotatably arranged around its own axis, and the winding needle body has a fixed needle extending longitudinally along the axial direction of the winding needle body; and Needle winding unit, including: The adjusting assembly comprises a moving member, a first slider and a first transmission member; the moving member is movably connected to the fixed needle along the axial direction of the winding needle body, and the first slider is movably connected to the fixed needle along the radial direction of the winding needle body; the first transmission member is located on one side of the fixed needle in the width direction, and is transmission-connected with the first slider and the moving member, so that when the moving member moves along the axial direction of the winding needle body, the first slider can be driven by the first transmission member to move along the radial direction of the winding needle body; The winding needle housing is fixedly connected to the first sliding block.

2. The needle winding mechanism according to claim 1, characterized in that: The fixed needle has a first side surface, a second side surface, a third side surface and a fourth side surface; the first side surface and the second side surface are respectively used as two side surfaces of the fixed needle in the radial direction of the winding needle body, and the third side surface and the fourth side surface are both connected between the first side surface and the second side surface, and are opposite to each other in the width direction of the fixed needle; The first transmission member is located on a side of the fixed needle having the third side surface and / or a side of the fixed needle having the fourth side surface.

3. The needle winding mechanism according to claim 2, characterized in that: At least two first sliders and at least two first transmission members are arranged on the side of the fixed needle having the third side surface and / or the side having the fourth side surface, the first sliders located on the same side of the fixed needle are spaced apart along the longitudinal extension direction of the fixed needle, the first transmission members and the first sliders located on the same side of the fixed needle are transmission connected one by one, and the winding needle housing is fixedly connected to the first sliders.

4. The needle winding mechanism according to claim 2, characterized in that: The adjustment assembly further comprises a first mounting shaft, and the moving member is arranged inside the fixed needle along the axial direction of the winding needle body; One end of the first mounting shaft is mounted on the moving member, and the other end of the first mounting shaft It passes through the third side surface or the fourth side surface and is connected to the first transmission member.

5. The needle winding mechanism according to any one of claims 1 to 4, characterized in that: The adjustment assembly further includes a second slider and a second transmission member, wherein the second slider is movably connected to the fixed needle along the radial direction of the winding needle body, and the second transmission member is transmission-connected to both the second slider and the moving member, so that when the moving member moves along the axial direction of the winding needle body, the second slider can be driven by the second transmission member to move along the radial direction of the winding needle body; The winding needle unit further comprises an inner clamping needle fixedly connected to the second slider, and the inner clamping needle can be used to clamp or release the material belt when following the second slider to move along the radial direction of the winding needle body.

6. The needle winding mechanism according to claim 5, characterized in that: The second transmission member is located at one side of the fixed needle in the width direction.

7. The needle winding mechanism according to claim 5 or 6, characterized in that: The fixed needle has a first side surface, a second side surface, a third side surface and a fourth side surface; the first side surface and the second side surface are respectively used as two side surfaces of the fixed needle in the radial direction of the winding needle body, and the third side surface and the fourth side surface are both connected between the first side surface and the second side surface, and are opposite to each other in the width direction of the fixed needle; The second transmission member is located on a side of the fixed needle having the third side surface and / or a side of the fixed needle having the fourth side surface.

8. The needle winding mechanism according to claim 7, characterized in that: At least two second sliding blocks and at least two second transmission members are arranged on a side of the fixed needle having the third side surface and / or a side having the fourth side surface; The second sliders located on the same side of the fixed needle are spaced apart along the longitudinal extension direction of the fixed needle; the second transmission members located on the same side of the fixed needle are transmission-connected to the second sliders one by one, and the inner clamping needles are fixedly connected to the second sliders.

9. The needle winding mechanism according to claim 7, characterized in that: The adjustment assembly further comprises a second mounting shaft, and the moving member is arranged inside the fixed needle along the axial direction of the winding needle body; One end of the second installation shaft is installed on the moving member, and the other end of the second installation shaft passes through the third side surface or the fourth side surface and is connected to the second transmission member.

10. The needle winding mechanism according to any one of claims 5 to 9, characterized in that: The fixed needles are provided with two, and the two fixed needles are arranged opposite to each other along the radial direction of the winding needle body; The winding needle units are provided in two numbers, and the two winding needle units are respectively arranged on the two fixed needles, the two winding needle shells are respectively located on the peripheries of the two fixed needles, and a slit for the feed tape to enter is formed between the two winding needle shells, and the two inner clamping needles are located between the two fixed needles and are used to clamp the material tape entering the slit.

11. The needle winding mechanism according to claim 10, characterized in that: The needle winding mechanism further comprises a first material strip clamping plate and a second material strip clamping plate, wherein the first material strip clamping plate and the second material strip clamping plate are respectively fixedly connected to the two inner clamping needles and extend in the slit along the radial direction of the needle winding body; The first material strip clamping plate and the second material strip clamping plate are spaced apart from each other to allow the material strip to enter.

12. The needle winding mechanism according to claim 11, characterized in that: The gap between the first material strip clamping plate and the second material strip clamping plate is larger than the gap between the two inner clamping needles.

13. A winding device, characterized in that: It comprises a needle winding mechanism as described in any one of claims 1 to 12.

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