Variable diameter winding mechanism

Abstract

The utility model relates to the variable diameter needle winding mechanism in the needle winding mechanism field, including the mounting seat, the inside formation of mounting seat has the accommodating cavity, the sliding block is connected with through the guide sliding part in the accommodating cavity, the sliding block is connected with the film clamp inner needle, and one end of film clamp inner needle exposes in the mounting seat outside through the accommodating cavity, the first outer needle subassembly and second outer needle subassembly are connected with respectively through the first guide component and the second guide component in the accommodating cavity, and the inside of first outer needle subassembly is connected with the positioning inner needle that is matched with film clamp inner needle through the buffer piece, and the drive block that can move to the accommodating cavity is connected on the mounting seat, and the end portion of drive block close to the accommodating cavity forms film clamp drive portion, needle misplacement drive portion and the diameter change drive portion that set up symmetrically in proper order, the utility model discloses through drive block connection drive source and makes drive block can control film clamp, needle misplacement and diameter change action in proper order, makes its automation control improve product consistency, strengthens the production efficiency and production quality of electric core.

Description

Technical Field

[0001] This utility model relates to the field of needle winding mechanisms, specifically to a variable diameter needle winding mechanism. Background Technology

[0002] Lithium-ion battery cells, as core energy storage components in the new energy field, have wide applications, including but not limited to electric vehicles, energy storage systems, and consumer electronics. Their performance directly affects the energy density, cycle life, and safety characteristics of end products. In the cell manufacturing process, winding technology, which involves stacking and winding positive and negative electrode sheets with a separator to form the cell body, is a key process for achieving high energy density and compact structure.

[0003] In the production of battery cells, a winding mechanism is usually required. In existing battery cell winding equipment, the winding mechanism is the core component. Its function is to tightly wind the electrode sheets and separator into a battery cell of a predetermined shape and size through rotational motion.

[0004] However, existing winding needle mechanisms have significant technical defects in practical applications. Due to the inevitable thickness fluctuations of the positive and negative electrode sheets in lithium batteries during coating, rolling, and other processes, traditional fixed-diameter winding needles cannot adaptively compensate for the differences in electrode sheet thickness. When the electrode sheets are generally too thick, the diameter of the wound cell will exceed the design tolerance; conversely, it will result in a loose cell. Currently, the industry generally adopts a method of manual intervention by stopping the machine and attaching a Teflon film to the surface of the winding needle to temporarily change the effective winding diameter. However, this operation requires frequent interruptions to the production line, which not only seriously reduces the production efficiency of the equipment, but also leads to poor product consistency due to differences in film attachment position, tension, and other human factors, thus affecting the production efficiency and quality of the cells. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned deficiencies by providing a variable diameter needle winding mechanism. This addresses the technical problem in the prior art where the existing needle winding mechanism is difficult to adjust due to differences in electrode thickness, which affects the winding efficiency and quality of the electrode and diaphragm.

[0006] The objective of this utility model is achieved through the following means:

[0007] A variable diameter needle winding mechanism includes a mounting base with a receiving cavity inside. A slider is connected to the receiving cavity via a guide slider, and a clamping inner needle is connected to the slider. One end of the clamping inner needle passes through the receiving cavity and protrudes outside the mounting base. A first outer needle assembly and a second outer needle assembly are connected to the receiving cavity via a first guide assembly and a second guide assembly, respectively. The first and second outer needle assemblies are respectively arranged on both sides of the clamping inner needle. A positioning inner needle that matches the clamping inner needle is connected to the inner side of the first outer needle assembly via a buffer. A drive block that can move into the receiving cavity is connected to the mounting base. The end of the drive block near the receiving cavity has a clamping drive part, a needle offset drive part, and a symmetrically arranged variable diameter drive part formed in sequence. Multiple elastic elements are provided in the receiving cavity for resetting the slider, the first outer needle assembly, and the second outer needle assembly.

[0008] When the drive block moves into the receiving cavity, the membrane clamping drive unit can drive the slider to move the membrane clamping inner needle towards the positioning inner needle to clamp the membrane. The needle misalignment drive unit can drive the second outer needle assembly away from the membrane clamping inner needle to misalign the needle. The diameter change drive unit can drive the first outer needle assembly and the second outer needle assembly to open synchronously relative to the membrane clamping inner needle.

[0009] Further as described above, the first outer needle assembly includes a first moving block, a first outer needle block, and a first cam bearing. The first moving block is disposed on the top of the slider and is connected to the first guide assembly through a ball bushing, so that the first moving block can move along the axial direction of the first guide assembly. The first outer needle block is connected to the first moving block, and one end of the first outer needle block extends horizontally with the inner needle of the membrane. The first cam bearing is connected to the first moving block and extends toward the drive block.

[0010] The first moving block is connected to the first guide assembly through a ball bushing, enabling the first moving block to move stably along the axial direction of the first guide assembly, thereby improving the motion accuracy and reliability of the outer needle assembly. The first outer needle block extends horizontally with the inner needle of the membrane clamping, ensuring that the outer needle and the inner needle maintain horizontal alignment during winding, providing basic structural support for subsequent diameter-changing actions.

[0011] When the drive block enters the receiving cavity, the sliding of the drive block along the receiving cavity causes the variable diameter drive part to make tangential contact with the outer surface of the first cam bearing. Thus, under the compression of the variable diameter drive part, the first cam bearing can drive the first moving block away from the inner needle of the clamping film, adapting to the winding requirements when the electrode thickness fluctuates.

[0012] Furthermore, as described above, a driving gap is formed between the first moving block and the slider, the driving block is disposed between the first moving block and the slider, and the end of the driving block extends into the driving gap.

[0013] The driving gap formed between the first moving block and the slider provides the driving block with a sliding space, so that the sliding of the driving block can act on the slider, the first moving block and the second moving block in sequence, ensuring the coordinated driving capability of the driving block.

[0014] Furthermore, as described above, a connecting groove for installing a positioning inner needle is formed on the inner side of the first outer needle block. The positioning inner needle is installed in the connecting groove and is limited by a limiting member. One end of the buffer member contacts the bottom wall of the connecting groove, and the other end of the buffer member contacts the inner side of the positioning inner needle. A clamping part that matches the positioning inner needle is formed on the side of the clamping inner needle.

[0015] The connecting groove on the inner side of the first outer needle block facilitates the installation and positioning of the inner positioning needle. The positioning needle is installed in the connecting groove by the limiting component. The buffer component is connected between the bottom wall of the connecting groove and the positioning needle. It can absorb the impact force during electrode thickness fluctuations or winding, as well as the pairing buffer clamping force with the membrane clamping needle, to ensure stable contact between the positioning needle and the membrane clamping needle. The membrane clamping part on the side of the membrane clamping needle is paired with the positioning needle, which improves the membrane clamping reliability.

[0016] Further as described above, the second outer needle assembly includes a second moving block, a second outer needle block, and a second cam bearing. The second moving block is disposed at the bottom of the slider and is connected to the second guide assembly via a ball bushing, allowing the second moving block to move along the axial direction of the second guide assembly. The second outer needle block is connected to the second moving block, and one end of the second outer needle block extends horizontally to the inner needle of the membrane. The second cam bearing is connected to the second moving block and extends toward the drive block.

[0017] The second outer needle assembly is connected to the second guide assembly, allowing the second outer needle assembly to move independently along the axial direction; the second outer needle block extends horizontally with the inner needle of the membrane, and the winding structure with the first outer needle block distributed on both sides of the inner needle of the membrane ensures the synchronicity of the outer needles on both sides when the diameter changes.

[0018] Furthermore, as described above, the side of the mounting base has a driving end, and the driving end has a guide groove for mounting the driving block. The guide groove is connected to the receiving cavity, and the end of the driving block passes through the receiving cavity along the guide groove, so that one end of the driving block can slide into the receiving cavity along the guide groove.

[0019] The drive end on the side of the mounting base is provided with a guide groove, which is connected to the receiving cavity. The drive block passes through the receiving cavity along the guide groove. The guide groove provides a precise movement path for the drive block, ensuring the coordination of actions such as clamping, misalignment, and diameter change, and reducing failures caused by drive block misalignment.

[0020] Furthermore, as described above, a cover plate is connected to the drive end, and an avoidance opening communicating with the guide groove is provided on the cover plate.

[0021] Furthermore, as described above, the slider is provided with a cam drive bearing, which is installed at the end of the slider near the first outer needle assembly. The first cam bearing and the second cam bearing are distributed on both sides of the drive block. The film clamping drive part is disposed on the side of the drive block near the cam drive bearing, the needle shifting drive part is disposed on the side of the drive block near the second cam bearing, and the diameter changing drive part is symmetrically disposed on both sides of the drive block.

[0022] The cam drive bearing on the slider, along with the first cam bearing and the second cam bearing, are distributed on both sides of the drive block. The layout of the clamping drive part, the needle shifting drive part, and the diameter changing drive part enables the drive block to simultaneously drive the slider (clamping inner needle), the second outer needle assembly (needle shifting), and the first and second outer needle assemblies (synchronous diameter changing) through a single movement. This achieves coordinated action of clamping, needle shifting, and diameter changing, improving the integration and efficiency of the mechanism and reducing the complexity of independent driving of multiple parts.

[0023] Furthermore, as described above, the first guide assembly, the second guide assembly, and the guide slider are all composed of a guide shaft and a bushing coaxially connected to the guide shaft. The guide shaft is installed in the receiving cavity. The slider, the first outer needle assembly, and the second outer needle assembly are coaxially connected to the bushing through ball bushings, so that the slider, the first outer needle assembly, and the second outer needle assembly can move along the axial direction of the guide shaft.

[0024] The first guide assembly, the second guide assembly, and the guide slide all adopt a guide shaft and bushing structure, and are connected to the slider and outer needle assembly through ball bushings. The guide shaft provides a high-precision guide reference, and the bushing and ball bushing cooperate to reduce moving friction, ensuring that the slider, the first outer needle assembly, and the second outer needle assembly move smoothly and accurately along the axial direction, improving the stability and life of the mechanism movement, and adapting to the high-frequency diameter change requirements when the electrode thickness fluctuates.

[0025] Furthermore, as described above, the drive block has a protrusion, and the mounting base is provided with a reset member. One end of the reset member contacts the protrusion, and the reset member can provide the drive block with a continuous elastic force that moves it away from the receiving cavity.

[0026] By providing a continuous elastic force away from the receiving cavity to the drive block through the reset component, the drive block can automatically reset after completing the actions of clamping, needle misalignment, and diameter change, ensuring the cyclic working capability of the mechanism, reducing manual intervention, and improving the degree of automation and production efficiency.

[0027] Furthermore, as described above, the elastic element, the reset element, and the buffer element are all composed of springs.

[0028] The elastic element, reset element, and buffer element all adopt a spring structure. As a common and reliable elastic element, the spring can effectively provide reset force and buffer force, adapt to the elastic requirements under different working conditions, ensure the stability and consistency of the mechanism's operation, and avoid the fluctuation of winding quality caused by the failure of the elastic element.

[0029] The beneficial effects of this utility model are as follows: The drive block integrates a film clamping drive unit, a needle misalignment drive unit, and a diameter adjustment drive unit. A single drive source can sequentially realize the film clamping action between the inner clamping needle and the positioning inner needle, the needle misalignment avoidance action of the second outer needle assembly, and the diameter adjustment action of the first and second outer needle assemblies. This avoids the traditional manual intervention method of stopping the machine to attach the film, achieving real-time dynamic adjustment during the winding process, significantly reducing production interruptions, and significantly improving the continuous operation capability and production efficiency of the equipment. Furthermore, the diameter adjustment drive unit on the drive block drives the first and second outer needle assemblies to open synchronously relative to the inner clamping needle, allowing for real-time adjustment of the effective winding diameter of the winding needles. This adaptively compensates for thickness differences in the positive and negative electrode sheets of lithium batteries during coating, rolling, and other processes. The drive block is connected to the drive source, enabling it to sequentially control the film clamping, needle misalignment, and diameter adjustment actions, thus automating the control, improving product consistency, and enhancing the production efficiency and quality of the battery cells. Attached Figure Description

[0030] Figure 1 This is a perspective view of the first direction in this embodiment;

[0031] Figure 2 This is a perspective view of the second direction in this embodiment;

[0032] Figure 3 This is an exploded view of the entire embodiment;

[0033] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0034] Figure 5 This is a schematic diagram of the membrane clamping structure in this embodiment;

[0035] Figure 6 This is a schematic diagram of the structure used in the variable diameter state in this embodiment;

[0036] Figure 7 This is a schematic diagram of the drive block in this embodiment;

[0037] Figure 8 This is a perspective view of the driving block in this embodiment;

[0038] The reference numerals in the figure are as follows:

[0039] 1-Buffer component, 2-First elastic component, 3-Second elastic component, 4-Third elastic component, 5-Bolt, 6-Limiting pressure block, 7-Limiting part, 8-Ball bushing, 9-Guide shaft, 10-Shaft sleeve, 11-Reset component, 12-Cam drive bearing, 13-Cover plate, 14-Allowing opening;

[0040] 100-Mounting base, 101-Receiving cavity, 102-Drive end, 103-Guide groove; 200-Slider, 300-Inner needle of clamping membrane;

[0041] 400-First outer needle assembly, 401-First moving block, 4011-Connecting hole, 4012-Connecting end, 402-First outer needle block, 4021-Connecting groove, 403-First cam bearing, 404-Positioning inner needle;

[0042] 500-Second outer needle assembly, 501-Second moving block, 5011-Mounting hole, 5012-Mounting end, 502-Second outer needle block, 503-Second cam bearing;

[0043] 600-Drive block, 601-Clipping drive unit, 602-Misaligned needle drive unit, 603-Variable diameter drive unit, 604-Protrusion. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0045] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0046] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] In this embodiment, refer to Figures 1-8The variable diameter needle winding mechanism specifically implemented includes a mounting base 100, with a receiving cavity 101 formed inside the mounting base 100. A slider 200 is connected to the receiving cavity 101 via a guide slider, and a clamping inner needle 300 is connected to the slider 200. One end of the clamping inner needle 300 passes through the receiving cavity 101 and protrudes outside the mounting base 100. A first outer needle assembly 400 and a second outer needle assembly 500 are respectively connected to the receiving cavity 101 via a first guide assembly and a second guide assembly. The first outer needle assembly 400 and the second outer needle assembly 500 are respectively arranged on both sides of the clamping inner needle 300. A positioning inner needle 404, which is paired with the clamping inner needle 300, is connected to the inner side of the first outer needle assembly 400 via a buffer 1. A drive block 600 that can move into the receiving cavity 101 is connected to the mounting base 100. (Refer to...) Figure 7 The end of the drive block 600 near the receiving cavity 101 is sequentially formed with a clamping drive part 601, a staggered needle drive part 602 and a symmetrically arranged variable diameter drive part 603. The receiving cavity 101 is provided with a plurality of elastic members for resetting the slider 200, the first outer needle assembly 400 and the second outer needle assembly 500 respectively.

[0048] When the drive block 600 moves into the receiving cavity 101, the clamping drive unit 601 can drive the slider 200 to move the clamping inner needle 300 towards the positioning inner needle 404 to clamp the film. The needle misalignment drive unit 602 can drive the second outer needle assembly 500 away from the clamping inner needle 300 to misalign the needles. The diameter change drive unit 603 can drive the first outer needle assembly 400 and the second outer needle assembly 500 to open synchronously relative to the clamping inner needle 300.

[0049] The elastic element includes a first elastic element 2, a second elastic element 3 and a third elastic element 4, which respectively apply elastic force to the first outer needle assembly 400, the second outer needle assembly 500 and the drive slider 200.

[0050] Reference Figure 3 The first outer needle assembly 400 includes a first moving block 401, a first outer needle block 402, and a first cam bearing 403. The first moving block 401 is disposed on the top of the slider 200 and is connected to the first guide assembly through a ball bushing 8, so that the first moving block 401 can move along the axial direction of the first guide assembly. The first outer needle block 402 is connected to the first moving block 401, and one end of the first outer needle block 402 extends horizontally with the inner needle 300 of the membrane. The first cam bearing 403 is connected to the first moving block 401 and extends towards the drive block 600.

[0051] The first moving block 401 is connected to the first guide assembly through the ball bushing 8, so that the first moving block 401 can move stably along the axial direction of the first guide assembly, which improves the motion accuracy and reliability of the outer needle assembly; the first outer needle block 402 extends horizontally with the inner needle 300 of the membrane clamping, ensuring that the outer needle and the inner needle maintain horizontal cooperation during winding, providing basic structural support for subsequent diameter changing actions.

[0052] When the drive block 600 is inserted into the receiving cavity 101, the sliding of the drive block 600 along the receiving cavity 101 causes the variable diameter drive part 603 to make tangential contact with the outer surface of the first cam bearing 403. Thus, under the pressure of the variable diameter drive part 603, the first cam bearing 403 can drive the first moving block 401 away from the inner needle 300 of the clamping film, adapting to the winding requirements when the electrode thickness fluctuates.

[0053] Reference Figure 3 The first moving block 401 has a connecting hole 4011 in the middle for inserting the ball bushing 8. One end of the first moving block 401 extends through the receiving cavity 101 toward the inner needle 300 of the membrane and forms a connecting end 4012. The connecting end 4012 is connected to the first outer needle block 402 by bolts 5. The first cam bearing 403 is installed at the bottom of the first moving block 401 and is installed at the end of the first moving block 401 near the drive block 600.

[0054] The first movable block 401 is connected to the first elastic member 2 on its side, so that one end of the first elastic member 2 contacts the inner wall of the receiving cavity 101, and the other end of the first elastic member 2 contacts the first movable block 401, so that the first elastic member 2 can provide the first movable block 401 with a continuous resetting elastic force.

[0055] A driving gap is formed between the first moving block 401 and the slider 200. The driving block 600 is disposed between the first moving block 401 and the slider 200, and the end of the driving block 600 extends into the driving gap.

[0056] The driving gap formed between the first moving block 401 and the slider 200 provides a sliding space for the driving block 600, so that the sliding of the driving block 600 can act on the slider 200, the first moving block 401 and the second moving block 501 in sequence, ensuring the coordinated driving capability of the driving block 600.

[0057] The first moving block 401, the driving block 600, the slider 200, and the second moving block 501 are distributed sequentially along the height of the receiving cavity 101.

[0058] Reference Figure 3 and Figure 4The inner side of the first outer needle block 402 is formed with a connecting groove 4021 for installing the positioning inner needle 404. The positioning inner needle 404 is installed in the connecting groove 4021 by the positioning part at the end and is limited by the limiting member. The limiting member includes a bolt 5 and a limiting pressure block 6. The bolt 5 passes through the limiting pressure block 6 and is installed on the inner side of the first outer needle block 402. The limiting pressure block 6 is formed with a limiting part 7 that passes through the connecting groove 4021. One end of the buffer member 1 contacts the bottom wall of the connecting groove 4021, and the other end of the buffer member 1 contacts the inner side of the positioning inner needle 404. The side of the clamping inner needle 300 is formed with a clamping part that matches the positioning inner needle 404.

[0059] The connecting groove 4021 on the inner side of the first outer needle block 402 facilitates the installation and positioning of the inner positioning needle 404. The positioning needle 404 is installed in the connecting groove 4021 by the positioning member. The buffer member 1 is connected between the bottom wall of the connecting groove 4021 and the positioning needle 404. It can absorb the impact force during electrode thickness fluctuation or winding, as well as the pairing buffer clamping force with the membrane clamping needle 300, to ensure stable contact between the positioning needle 404 and the membrane clamping needle 300. The membrane clamping part on the side of the membrane clamping needle 300 is paired with the positioning needle 404 to improve the membrane clamping reliability.

[0060] Specifically, the positioning inner pin 404 can be compressed or reset and ejected along the connecting groove 4021 under the elastic action of the buffer 1. The limiting part 7 can prevent the positioning inner pin 404 from popping out of the connecting groove 4021 under the elastic reset ejection action of the buffer 1.

[0061] Reference Figure 3 The second outer needle assembly 500 includes a second moving block 501, a second outer needle block 502, and a second cam bearing 503. The second moving block 501 is disposed at the bottom of the slider 200 and is connected to the second guide assembly through a ball bushing 8, so that the second moving block 501 can move along the axial direction of the second guide assembly. The second outer needle block 502 is connected to the second moving block 501, and one end of the second outer needle block 502 extends horizontally with the inner needle 300 of the membrane clamp. The second cam bearing 503 is connected to the second moving block 501 and extends toward the drive block 600.

[0062] The second outer needle assembly 500 is connected to the second guide assembly, allowing the second outer needle assembly 500 to move independently along the axial direction; the second outer needle block 502 extends horizontally with the inner needle 300 of the membrane, and the winding structure distributed with the first outer needle block 402 on both sides of the inner needle 300 of the membrane ensures the synchronicity of the outer needles on both sides when the diameter changes.

[0063] The second moving block 501 has a mounting hole 5011 in the middle for inserting the ball bushing 8. One end of the second moving block 501 extends through the receiving cavity 101 into the inner needle 300 of the membrane and forms a mounting end 5012. The mounting end 5012 is connected to the second outer needle block 502 by bolts 5. The second cam bearing 503 is installed on the top of the second moving block 501 and is installed on one end of the second moving block 501 near the drive block 600. At the same time, the first cam bearing 403 and the second cam bearing 503 are distributed on both sides of the drive block 600.

[0064] The second movable block 501 is connected to the second elastic member 3 on its side, so that one end of the second elastic member 3 contacts the inner wall of the receiving cavity 101 and the other end of the second elastic member 3 contacts the second movable block 501, so that the second elastic member 3 can provide the second movable block 501 with a continuous reset elastic force.

[0065] The specific working principle of the misaligned needle in this embodiment is as follows: When the drive block 600 moves, the misaligned needle drive unit 602 can apply a squeezing force to the second cam bearing 503, causing the second moving block 501 to move away from the inner needle 300 along the second guide assembly, thereby completing the misaligned needle action. This facilitates the subsequent needle pulling after the winding mechanism completes the winding of the battery cell. Specifically, the misaligned needle increases the distance between the second outer needle block 502 and the first outer needle block 402. At the same time, when the battery cell winding is completed, the drive block 600 is reset by the elastic action of the reset member 11. The drive block 600 moves away from the receiving cavity 101 and the misaligned needle drive unit 600 releases the squeezing force applied to the second cam bearing 503. At this time, the second outer needle block 502 is reset by the action of the elastic member and moves towards the inner needle 300 along the second guide assembly, thereby reducing the distance between the second outer needle block 502 and the first outer needle block 402 to facilitate the subsequent needle pulling.

[0066] Specifically, when the drive block 600 moves and the variable diameter drive parts 603 on both sides apply pressure to the first cam bearing 403 and the second cam bearing 503 respectively, it ensures that the synchronous opening action of the first outer needle assembly 400 and the second outer needle assembly 500 is accurate and smooth, thereby improving the reliability and stability of the mechanism's movement.

[0067] The mounting base 100 has a driving end 102 formed on its side. The driving end 102 has a guide groove 103 for mounting the driving block 600. The guide groove 103 communicates with the receiving cavity 101. The end of the driving block 600 passes through the receiving cavity 101 along the guide groove 103, so that one end of the driving block 600 can slide into the receiving cavity 101 along the guide groove 103.

[0068] The drive end 102 on the side of the mounting base 100 is provided with a guide groove 103. The guide groove 103 is connected to the receiving cavity 101. The drive block 600 can pass into the receiving cavity 101 along the guide groove 103. The guide groove 103 provides a precise moving path for the drive block 600, ensuring the coordination of actions such as clamping, misalignment, and diameter change, and reducing failures caused by the offset of the drive block 600.

[0069] A cover plate 13 is connected to the drive end 102, and an avoidance opening 14 communicating with the guide groove 103 is provided on the cover plate 13. The top of the drive block 600 is connected to a drive source, so that the drive source can drive the drive block 600 to move along the guide groove 103.

[0070] The drive block 600 has a protrusion 604, and the mounting base 100 is provided with a reset member 11. One end of the reset member 11 contacts the protrusion 604, and the reset member 11 can provide the drive block 600 with an elastic force that continuously moves away from the receiving cavity 101.

[0071] The reset component 11 provides a continuous elastic force to the drive block 600 away from the receiving cavity 101, enabling the drive block 600 to automatically reset after completing the actions of clamping, misaligning needles, and changing diameter. This ensures the cyclic working capability of the mechanism, reduces manual intervention, and improves the degree of automation and production efficiency.

[0072] The slider 200 is provided with a cam drive bearing 12, which is installed at the end of the slider 200 near the first outer needle assembly 400. The first cam bearing 403 and the second cam bearing 503 are distributed on both sides of the drive block 600. The clamping drive part 601 is provided on the side of the drive block 600 near the cam drive bearing 12. The needle shifting drive part 602 is provided on the side of the drive block 600 near the second cam bearing 503. The diameter changing drive part 603 is symmetrically arranged on both sides of the drive block 600.

[0073] The cam drive bearing 12 on the slider 200, along with the first cam bearing 403 and the second cam bearing 503, are distributed on both sides of the drive block 600. The layout of the clamping drive part 601, the needle shifting drive part 602, and the diameter changing drive part 603 enables the drive block 600 to simultaneously drive the slider 200 (clamping inner needle 300), the second outer needle assembly 500 (needle shifting), and the first outer needle assembly 400 and the second outer needle assembly 500 (synchronous diameter changing) through a single movement. This achieves coordinated action of clamping, needle shifting, and diameter changing, improves the integration of the mechanism and the efficiency of action, and reduces the complexity of independent driving of multiple parts.

[0074] The slider 200 is connected to the third elastic element 4 on its side, so that one end of the third elastic element 4 contacts the inner wall of the receiving cavity 101 and the other end of the third elastic element 4 contacts the slider 200, so that the third elastic element 4 can provide the slider 200 with a continuous reset elastic force.

[0075] The first guide assembly, the second guide assembly, and the guide slider are all composed of a guide shaft 9 and a bushing 10 coaxially connected to the guide shaft 9. The guide shaft 9 is installed in the receiving cavity 101. The slider 200, the first outer needle assembly 400, and the second outer needle assembly 500 are coaxially connected to the bushing 10 through a ball bushing 8, so that the slider 200, the first outer needle assembly 400, and the second outer needle assembly 500 can move along the axial direction of the guide shaft 9.

[0076] The first guide assembly, the second guide assembly, and the guide slide all adopt the structure of guide shaft 9 and bushing 10, and are connected to slider 200 and outer needle assembly through ball bushing 8. Guide shaft 9 provides a high-precision guide reference, and bushing 10 and ball bushing 8 cooperate to reduce moving friction, ensuring that slider 200, first outer needle assembly 400 and second outer needle assembly 500 move smoothly and accurately along the axial direction, improving the stability and life of the mechanism movement, and adapting to the high-frequency diameter change requirements when the electrode thickness fluctuates.

[0077] The first elastic element 2, the second elastic element 3, and the third elastic element 4 are distributed along the axial direction of the first guide assembly, the second guide assembly, and the guide sliding element, respectively.

[0078] The elastic element, reset element 11, and buffer element 1 are all composed of springs. The elastic element, reset element 11, and buffer element 1 all employ spring structures. Springs, as common and reliable elastic elements, can effectively provide reset force and buffering force, adapting to elastic requirements under different working conditions, ensuring the stability and consistency of the mechanism's operation, and avoiding fluctuations in winding quality due to the failure of the elastic element.

[0079] In the initial state of this embodiment, the drive block 600 moves away from the receiving cavity 101 by the elastic force of the reset member 11. At this time, the first elastic member 2, the second elastic member 3 and the third elastic member 4 can drive the first outer needle assembly 400, the second outer needle assembly 500 and the slider 200 to reset, that is, the needle winding mechanism is in the initial state.

[0080] The specific action process in this embodiment is as follows:

[0081] Lamination: refer to Figure 6 When the drive block 600 is driven into the receiving cavity 101 by the drive source, the sliding of the drive block 600 along the receiving cavity 101 causes the clamping drive part 601 to come into contact with the outer surface of the cam drive bearing 12. Under the pressure of the clamping drive part 601, the cam drive bearing 12 can drive the slider 200 to move closer to the first outer needle assembly 400, thereby driving the clamping inner needle 300 to move closer to the positioning inner needle 404, so that the clamping part and the positioning inner needle 404 can complete the clamping of the film.

[0082] Needle misalignment: After the clamping action is completed, a pushing force is continued to be applied to the drive block 600. The drive block 600 has a clearance part on its side near the second outer needle assembly 500. When the push causes the needle misalignment drive part 602 to contact the second cam bearing 503, the drive block 600 is pushed further. Under the compression of the needle misalignment drive part 602, the second cam bearing 503 can drive the second moving block 501 to open outward. That is, the second moving block 501 drives the second outer needle block 502 away from the clamping inner needle 300, thereby completing the needle misalignment action of the second outer needle block 502. At the same time, the first cam bearing 403 and the second cam bearing 503 are relatively distributed with the drive block 600 as the central axis.

[0083] Variable diameter: Refer to Figure 8 When the drive block 600 continues to push into the receiving cavity 101, since the first cam bearing 403 and the second cam bearing 503 are relatively distributed, the variable diameter drive parts 603 on both sides of the drive block 600 contact the first cam bearing 403 and the second cam bearing 503 respectively. Under the compression of the variable diameter drive parts 603, they can expand synchronously to opposite sides to complete the variable diameter of the first outer needle block 402 and the second outer needle block 502.

[0084] The drive block 600 integrates a film clamping drive unit 601, a needle misalignment drive unit 602, and a diameter adjustment drive unit 603. With a single drive source, it can sequentially realize the film clamping action of the inner needle 300 and the positioning inner needle 404, the needle misalignment avoidance action of the second outer needle assembly 500, and the diameter adjustment action of the first and second outer needle assemblies 500. This avoids the traditional manual intervention method of attaching film during machine stoppage, realizes real-time dynamic adjustment during winding, greatly reduces the number of production interruptions, improves product consistency through automated control, and enhances the production efficiency and quality of battery cells.

[0085] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A variable diameter needle winding mechanism, comprising a mounting base, wherein a receiving cavity is formed inside the mounting base, a slider is connected to the receiving cavity via a guide slider, a clamping inner needle is connected to the slider, and one end of the clamping inner needle passes through the receiving cavity and protrudes outside the mounting base, characterized in that: The receiving cavity is connected to a first outer needle assembly and a second outer needle assembly via a first guide assembly and a second guide assembly, respectively. The first outer needle assembly and the second outer needle assembly are respectively arranged on both sides of the inner needle of the membrane clamping. The inner side of the first outer needle assembly is connected to a positioning inner needle that matches the inner needle of the membrane clamping through a buffer. A driving block that can move into the receiving cavity is connected to the mounting base. The end of the driving block near the receiving cavity is sequentially formed with a membrane clamping driving part, a needle offset driving part, and a symmetrically arranged variable diameter driving part. The receiving cavity is provided with a plurality of elastic elements for driving the slider, the first outer needle assembly, and the second outer needle assembly to reset. When the drive block moves into the receiving cavity, the membrane clamping drive unit can drive the slider to move the membrane clamping inner needle towards the positioning inner needle to clamp the membrane. The needle misalignment drive unit can drive the second outer needle assembly away from the membrane clamping inner needle to misalign the needle. The diameter change drive unit can drive the first outer needle assembly and the second outer needle assembly to open synchronously relative to the membrane clamping inner needle.

2. The variable diameter needle winding mechanism according to claim 1, characterized in that: The first outer needle assembly includes a first moving block, a first outer needle block, and a first cam bearing. The first moving block is disposed on the top of the slider and is connected to the first guide assembly through a ball bushing, so that the first moving block can move along the axial direction of the first guide assembly. The first outer needle block is connected to the first moving block, and one end of the first outer needle block extends horizontally with the inner needle of the membrane. The first cam bearing is connected to the first moving block and extends towards the drive block.

3. The variable diameter needle winding mechanism according to claim 2, characterized in that: A driving gap is formed between the first moving block and the slider. The driving block is disposed between the first moving block and the slider, and the end of the driving block extends into the driving gap.

4. The variable diameter needle winding mechanism according to claim 2, characterized in that: The inner side of the first outer needle block has a connecting groove for installing the positioning inner needle. The positioning inner needle is installed in the connecting groove and is limited by the limiting member. One end of the buffer member contacts the bottom wall of the connecting groove, and the other end of the buffer member contacts the inner side of the positioning inner needle. The side of the clamping inner needle has a clamping part that matches the positioning inner needle.

5. The variable diameter needle winding mechanism according to claim 3, characterized in that: The second outer needle assembly includes a second moving block, a second outer needle block, and a second cam bearing. The second moving block is disposed at the bottom of the slider and is connected to the second guide assembly through a ball bushing, so that the second moving block can move along the axial direction of the second guide assembly. The second outer needle block is connected to the second moving block, and one end of the second outer needle block extends horizontally with the inner needle of the membrane. The second cam bearing is connected to the second moving block and extends toward the drive block.

6. The variable diameter needle winding mechanism according to claim 1, characterized in that: The side of the mounting base has a driving end, and a guide groove for mounting the driving block is provided on the driving end. The guide groove is connected to the receiving cavity. The end of the driving block passes through the receiving cavity along the guide groove, so that one end of the driving block can slide into the receiving cavity along the guide groove.

7. The variable diameter needle winding mechanism according to claim 5, characterized in that: The slider is provided with a cam drive bearing, which is installed at the end of the slider near the first outer needle assembly. The first cam bearing and the second cam bearing are distributed on both sides of the drive block. The film clamping drive part is located on the side of the drive block near the cam drive bearing. The needle shifting drive part is located on the side of the drive block near the second cam bearing. The diameter changing drive part is symmetrically located on both sides of the drive block.

8. The variable diameter needle winding mechanism according to any one of claims 1-7, characterized in that: The first guide assembly, the second guide assembly, and the guide slider are all composed of a guide shaft and a bushing coaxially connected to the guide shaft. The guide shaft is installed in the receiving cavity. The slider, the first outer needle assembly, and the second outer needle assembly are coaxially connected to the bushing through ball bushings, so that the slider, the first outer needle assembly, and the second outer needle assembly can move along the axial direction of the guide shaft.

9. The variable diameter needle winding mechanism according to any one of claims 1-7, characterized in that: The drive block has a protrusion, and the mounting base has a reset member. One end of the reset member contacts the protrusion, and the reset member can provide the drive block with a continuous elastic force that moves it away from the receiving cavity.

10. The variable diameter needle winding mechanism according to claim 9, characterized in that: The elastic element, the reset element, and the buffer element are all composed of springs.

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