Adaptive variable diameter spool pin lock mechanism

Abstract

The utility model relates to the field of self -adaptation variable diameter needle winding lock catch mechanism, including drive seat and telescopic component, the telescopic component is by the shaft sleeve and with the shaft sleeve coaxial connection telescopic axle constitutes, and telescopic axle can reciprocating telescopic movement along the axial direction of shaft sleeve, the inside connection of telescopic axle has rotatable inner needle axle, and one end of inner needle axle is exposed to telescopic axle outside and is formed with inner needle top block, and the end part of inner needle axle is close to inner needle top block and is connected with needle nozzle through the positioning flange, and needle nozzle can move close or away from the positioning flanely along the guide piece, and the elastic piece is equipped between needle nozzle and the positioning flanely, and the inner wall of sleeve hole and the outside of inner needle top block form adaptive clearance, the utility model discloses when telescopic axle is along the axial ejection, and inner needle top block and sleeve hole can be used for resisting needle winding, and at the same time needle winding applies extrusion to needle nozzle to make needle nozzle produce reverse contraction, and cooperate needle winding through adaptive clearance and lock catch, improve the consistency and production efficiency of electric core winding product.

Description

Technical Field

[0001] This utility model relates to the field of needle coil locking mechanisms, specifically to an adaptive variable diameter needle coil locking 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 battery cell winding equipment, the needle locking mechanism is a key functional module for achieving precise positioning, tensioning, and fixing of the electrode and separator. Existing needle locking mechanisms typically consist of a locking assembly and a drive unit: the needle winding mechanism carries and winds the electrode and separator; the locking assembly secures the end of the needle winding mechanism through mechanical engagement or elastic clamping to prevent material loosening during winding; thus ensuring the stability of battery cell winding and product consistency.

[0004] However, existing needle winding locking mechanisms still have some technical defects: existing locking mechanisms are mainly used to support the front end of the needle winding and lock the inner needle, and fix the outer needle to ensure the stability of the outer needle winding. However, due to batch differences or process fluctuations in the coating thickness of the positive and negative electrode sheets and the thickness of the separator substrate, the fixed diameter needle winding cannot dynamically adjust the winding radius according to the actual material thickness, resulting in uneven tension between the electrode sheet and the separator during the winding process, which can easily cause wrinkles, misalignment or local loosening. After setting up a variable diameter needle winding mechanism to address the thickness difference problem, it needs to be used in conjunction with a variable diameter locking mechanism. Therefore, developing a locking mechanism that can adapt to the change in needle winding diameter, dynamically adjust to the winding radius and stabilize the locking has become an urgent need to improve the consistency of battery cell winding products. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned shortcomings by providing an adaptive variable diameter needle winding locking mechanism. This addresses the technical problem in the prior art where the existing locking mechanism has a simple structure, making it difficult to adapt to variable diameter needle windings and affecting the consistency and accuracy of product winding production.

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

[0007] An adaptive variable diameter needle locking mechanism includes a drive base and a telescopic assembly. The telescopic assembly consists of a bushing and a telescopic shaft coaxially connected to the bushing. One end of the telescopic shaft is connected to the drive base, and the other end of the telescopic shaft extends outward through the bushing, allowing the telescopic shaft to reciprocate along the axial direction of the bushing. The telescopic shaft is a hollow shaft, and a rotatable inner needle shaft is connected inside the telescopic shaft. One end of the inner needle shaft is exposed outside the telescopic shaft and forms an inner needle top block. The end of the inner needle shaft near the inner needle top block is connected to a needle nozzle through a positioning flange. The needle nozzle is connected to the positioning flange through a guide, allowing the needle nozzle to move along the guide towards or away from the positioning flange. An elastic element is provided between the needle nozzle and the positioning flange to provide a continuous force to the needle nozzle. The inside of the needle nozzle has a sleeve hole for mating and inserting the inner needle top block. An adaptive gap is formed between the inner wall of the sleeve hole and the outer side of the inner needle top block.

[0008] When the telescopic shaft is pushed out axially, the inner needle top block and the sleeve hole can be used to hold the coiled needle, while the coiled needle applies pressure to the needle tip to cause the needle tip to retract in the opposite direction, and locks with the coiled needle through the adaptive gap.

[0009] Furthermore, as described above, one end of the drive seat is formed with a connecting hole for mounting a telescopic shaft, one end of the telescopic shaft is paired and inserted into the connecting hole, and the outer side of the drive seat is provided with a limiting hole for fixing the telescopic shaft.

[0010] By using the connection hole and the limiting hole, the telescopic shaft and the drive seat are stably installed and fixed, ensuring the connection and positioning accuracy between the telescopic shaft and the fixed seat, providing stable support for the subsequent adaptive diameter change process, and avoiding needle deflection caused by unstable fixing of the telescopic shaft.

[0011] Furthermore, as described above, a mounting flange is formed at the end of the bushing near the inner needle top block, and a mounting hole for connection is provided on the mounting flange. A stop block is connected to the end of the telescopic shaft near the inner needle top block.

[0012] The mounting flange and mounting holes facilitate quick connection and fixation of the locking mechanism to external equipment, improving assembly efficiency; the stop block provides a limiting buffer for the retraction of the telescopic shaft.

[0013] Furthermore, as described above, the telescopic shaft is internally fitted with a bearing, and one end of the inner needle shaft forms a rotating part. The rotating part is coaxially connected to the bearing, allowing the rotating part to pass through the telescopic shaft. One end of the rotating part passes through the mounting hole along the axial direction of the telescopic shaft and is connected to a fixing ring. A positioning flange is disposed between the rotating part and the inner needle top block, and a fixing hole is provided on the positioning flange.

[0014] The coaxial connection between the bearing and the rotating part allows the inner needle shaft to rotate stably within the telescopic shaft, reducing rotational friction and ensuring the smoothness of the inner needle shaft as it rotates with the coiled needle; the positioning flange can move relative to the stop block closer to or further away from the mating part.

[0015] Furthermore, as described above, the inner needle top block is inserted into the sleeve hole, and the inner needle top block has a positioning hole that communicates with the outside. The positioning hole passes through the sleeve hole and communicates with the outside. The outer side of the inner needle top block is provided with an inclined positioning surface.

[0016] The positioning hole can cooperate with the external structure to achieve precise positioning of the inner needle top block. The inclined positioning surface and the inner wall of the needle nozzle sleeve hole form an adaptive gap. When the coil needle needs to change diameter due to changes in material thickness, the inclined cooperation between the positioning surface and the sleeve hole can dynamically adjust the gap size, so that the coil needle squeezes the needle nozzle to produce reverse contraction, thereby adapting to different winding radii and solving the problem that fixed diameter coil needles cannot adapt to material thickness fluctuations.

[0017] Furthermore, as described above, the needle tip is provided with a mounting groove and a guide hole communicating with the mounting groove. The guide hole and the fixing hole are coaxially arranged. The guide component includes a guide shaft and a bushing. The bushing is paired and installed in the guide hole. One end of the guide shaft passes through the bushing and is fixedly connected to the fixing hole. The other end of the guide shaft forms a limiting part, allowing the needle tip to move closer to or further away from the positioning flange. The elastic element can provide the needle tip with a continuous elastic force that moves it away from the positioning flange, causing the needle tip to be pushed out along the axial direction of the guide shaft through the bushing.

[0018] The fit between the guide hole, guide shaft, and bushing ensures the straightness of the needle tip movement, preventing deviation or jamming. The elastic force of the elastic element allows the needle tip to automatically push out when no external force is applied. When the needle tip is squeezed due to a change in diameter, the needle tip can retract in the opposite direction along the guide shaft. The contact state with the needle tip is dynamically adjusted through the adaptive gap to achieve stable locking, thereby adapting to the changes in winding radius caused by different thicknesses of materials and improving problems such as uneven tension and wrinkles caused by the fixed locking structure.

[0019] Furthermore, as described above, the inner wall of the sleeve hole is provided with an inclined clamping surface, and the clamping surface and the positioning surface are in a figure-eight shape.

[0020] The fit between the clamping surface and the positioning surface allows the gap between them to automatically adjust with the change in the diameter of the coiling needle when the coiling needle squeezes the nozzle, forming an adaptive locking effect. This ensures stable fixation of the coiling needle and allows the coiling needle to dynamically adjust the contact surface when the material thickness fluctuates, avoiding loosening of the lock or local stress concentration caused by diameter mismatch, thus improving the stability of the winding process.

[0021] Furthermore, as described above, a cam driver is connected to the drive unit via a drive section.

[0022] Cam drivers provide precise drive control, ensuring smooth and controllable axial extension and retraction of the telescopic shaft. They meet the requirements for telescopic accuracy during adaptive diameter changes, avoid positioning deviations of the winding needle due to unstable drive, and thus improve the accuracy and consistency of winding radius adjustment.

[0023] Furthermore, as described above, a reset element is provided between the bushing and the drive seat. The reset element is sleeved and installed on the telescopic shaft, and the reset element can provide the drive seat with an elastic force that drives the telescopic shaft to continuously contract and expand.

[0024] The reset component allows the telescopic shaft to automatically retract to its initial state when no external force is applied. When it needs to be pushed out, it can overcome the elastic force to achieve telescopic movement. This adapts to the dynamic squeezing requirements of the coiling needle during the diameter change process, avoids structural damage caused by hard collisions of the telescopic shaft, and maintains the smoothness of the telescopic movement, thus improving the reliability of adaptive adjustment.

[0025] Furthermore, as described above, multiple elastic elements are provided, and these multiple elastic elements are arranged in a circumferentially spaced manner between the needle tip and the positioning flange. Both the reset element and the elastic elements are composed of springs.

[0026] The circumferentially spaced arrangement of multiple elastic elements ensures that the needle tip is subjected to uniform force during contraction and ejection, avoiding needle tip deviation or jamming caused by uneven local force; the elastic characteristics of the spring provide a continuous and stable restoring force, so that the needle tip always maintains the tendency to move in the ejection direction, thereby forming a stable dynamic lock with the coiled needle during the adaptive diameter change process.

[0027] The beneficial effects of this utility model are as follows: The telescopic component consists of a bushing and a telescopic shaft connected coaxially. The telescopic shaft can reciprocate along the axial direction of the bushing, allowing the locking mechanism to contact the external winding needle mechanism under the drive of the drive source. The needle nozzle on the locking mechanism can dynamically match different winding radii. The needle nozzle is connected to the positioning flange through the guide and can move along the guide, so that the needle nozzle can automatically retract in the opposite direction when squeezed by the winding needle, actively adapting to the change in the diameter of the winding needle, maintaining a tight fit with the winding needle, and avoiding the loosening or falling off of the lock due to the fluctuation of the winding diameter. The sleeve hole opened inside the needle nozzle forms an adaptive gap with the outer side of the inner needle top block, so that the inner needle top block and the sleeve hole can be finely adjusted according to the actual size or local deformation of the winding needle when they abut against the winding needle, achieving adaptive fit. This effectively solves the problems of winding wrinkles, misalignment or local loosening caused by the difference in the thickness of the electrode sheet and the separator, and improves the consistency and production efficiency of the battery cell winding products. Attached Figure Description

[0028] Figure 1 This is a perspective view of this embodiment;

[0029] Figure 2 This is a diagram showing the extension and use of the telescopic shaft in this embodiment;

[0030] Figure 3 This is a planar sectional view of this embodiment;

[0031] Figure 4 This is a three-dimensional sectional view of this embodiment;

[0032] Figure 5 This is an overall exploded view of this embodiment;

[0033] Figure 6 This is a diagram showing the connection and usage status of the locking mechanism and the needle winding mechanism in this embodiment;

[0034] The reference numerals in the figure are as follows:

[0035] 100-Drive base, 101-Drive unit, 102-Connecting hole, 103-Limiting hole;

[0036] 200-Sleeve, 201-Mounting flange, 202-Mounting hole;

[0037] 300 - Telescopic shaft, 301 - Guide groove;

[0038] 400-Inner needle shaft, 401-Inner needle top block, 402-Positioning flange, 403-Rotating part, 404-Fixing hole, 405-Positioning hole, 406-Positioning surface;

[0039] 500 - Needle tip, 501 - Sleeve hole, 502 - Mounting groove, 503 - Guide hole, 504 - Clamping surface;

[0040] 600-Guide component, 601-Guide shaft, 602-Bushing, 603-Limiting part;

[0041] 700-Elastic element, 800-Reset element, 900-Stop block, 1000-Bearing, 2000-Fixing ring, 3000-Cam driver, 4000-Spring retaining ring. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0043] 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.

[0044] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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.

[0045] In this embodiment, refer to Figures 1-6The adaptive variable diameter needle locking mechanism specifically implemented includes a drive base 100 and a telescopic assembly. The telescopic assembly consists of a bushing 200 and a telescopic shaft 300 coaxially connected to the bushing 200. One end of the telescopic shaft 300 is connected to the drive base 100, and the other end of the telescopic shaft 300 extends outward through the bushing 200, allowing the telescopic shaft 300 to reciprocate along the axial direction of the bushing 200. The telescopic shaft 300 is made of a hollow shaft, and a rotatable inner needle shaft 400 is connected inside the telescopic shaft 300. One end of the inner needle shaft 400 is exposed outside the telescopic shaft 300 and forms an inner... The needle tip block 401 and the inner needle shaft 400 are connected to the end of the inner needle tip block 401 via a positioning flange 402. The needle tip 500 is connected to the positioning flange 402 via a guide 600, so that the needle tip 500 can move along the guide 600 to approach or move away from the positioning flange 402. An elastic element 700 is provided between the needle tip 500 and the positioning flange 402 to provide a continuous force to the needle tip 500. The needle tip 500 has a sleeve hole 501 inside for mating and passing through the inner needle tip block 401. The inner wall of the sleeve hole 501 and the outer side of the inner needle tip block 401 form an adaptive gap.

[0046] When the telescopic shaft 300 is pushed out axially, the inner needle top block 401 and the sleeve hole 501 can be used to hold the coiled needle, while the coiled needle applies pressure to the needle tip 500 to cause the needle tip 500 to retract in the opposite direction, and locks with the coiled needle through the adaptive gap.

[0047] Specifically, in this embodiment, the telescopic shaft 300 and the inner needle shaft 400 form a shaft-in-shaft structure, so that the telescopic shaft 300 is mainly used to drive the inner needle shaft 400 to extend and retract synchronously, and the inner needle shaft 400 can rotate through the rotating part 403.

[0048] One end of the drive seat 100 is formed with a connecting hole 102 for mounting the telescopic shaft 300. One end of the telescopic shaft 300 is inserted into the connecting hole 102. A plurality of limiting holes 103 for fixing the telescopic shaft 300 are arranged on the outer circumference of the drive seat 100.

[0049] By cooperating with the connecting hole 102 and the limiting hole 103, the telescopic shaft 300 and the drive seat 100 are stably installed and fixed, ensuring the connection and positioning accuracy between the telescopic shaft 300 and the fixed seat, providing stable support for the subsequent adaptive diameter change process, and avoiding the deflection of the coiling needle due to the unstable fixing of the telescopic shaft 300.

[0050] Specifically, the inner needle shaft 400 is inserted into the telescopic shaft 300 to form a shaft within a shaft. At the same time, one end of the inner needle shaft 400 is connected to the fixing ring 2000 and inserted into the connecting hole 102. The end of the telescopic shaft 300 is paired and inserted into the connecting hole 102. The telescopic shaft 300 is clamped and limited by bolts inserted into the limiting hole 103, thereby completing the connection between the telescopic shaft 300 and the drive seat 100.

[0051] Reference Figures 3-4 The bushing 200 has a mounting flange 201 at the end near the inner needle top block 401. The mounting flange 201 has a mounting hole 202 for connection. The telescopic shaft 300 has a stop block 900 at the end near the inner needle top block 401.

[0052] The mounting flange 201 and mounting hole 202 facilitate quick connection and fixation of the locking mechanism with external equipment, improving assembly efficiency; the stop block 900 provides a limit buffer for the retraction of the telescopic shaft 300.

[0053] The bushing 200 has a mounting flange 201 for fixed connection with the outside. Bolts are passed through the mounting hole 202 to install and connect with the external connector. Specifically, in this embodiment, the bushing 200 is used to connect to the external rotating mechanism so that the rotating mechanism can drive the locking mechanism to rotate as a whole.

[0054] Specifically, in this embodiment, the bushing 200 and the telescopic shaft 300 are ball splines, so that the bushing 200 forms a spline nut and the telescopic shaft 300 forms a hollow spline shaft.

[0055] The telescopic shaft 300 has guide grooves 301 distributed along the axial direction on its outer side, and the bushing 200 is paired with the guide grooves 301 by ball bearings.

[0056] Reference Figures 3-4 The telescopic shaft 300 is internally fitted with two bearings 1000. One end of the inner needle shaft 400 forms a rotating part 403. The rotating part 403 is coaxially connected to the two bearings 1000, so that the rotating part 403 passes into the telescopic shaft 300. One end of the rotating part 403 passes through the mounting hole 202 along the axial direction of the telescopic shaft 300 and is connected to a fixing ring 2000. The positioning flange 402 is disposed between the rotating part 403 and the inner needle top block 401. The positioning flange 402 is provided with a fixing hole 404.

[0057] In this embodiment, the inner needle shaft 400 abuts against the outer needle winding mechanism through the inner needle top block 401, so that the needle winding mechanism can drive the inner needle shaft 400 to rotate through the bearing 1000 to adapt to the winding mechanism to wind the battery cell.

[0058] The inner needle top block 401 is inserted into the sleeve hole 501. The inner needle top block 401 has a positioning hole 405 that communicates with the outside. The positioning hole 405 passes through the sleeve hole 501 and communicates with the outside. The outer side of the inner needle top block 401 is provided with an inclined positioning surface 406.

[0059] The positioning hole 405 can cooperate with the external structure to achieve precise positioning of the inner needle top block 401. The inclined positioning surface 406 forms an adaptive gap with the inner wall of the needle nozzle 500 sleeve hole 501. When the coil needle needs to change diameter due to changes in material thickness, the inclined cooperation between the positioning surface 406 and the sleeve hole 501 can dynamically adjust the gap size, so that the coil needle squeezes the needle nozzle 500 to produce reverse contraction, thereby adapting to different winding radii and solving the problem that fixed diameter coil needles cannot adapt to material thickness fluctuations.

[0060] Specifically, the positioning hole 405 is used to match the inner winding needle, ensuring the positioning accuracy of the inner winding needle, thereby improving the accuracy and consistency of subsequent winding.

[0061] Reference Figures 4-5 The needle tip 500 has a mounting groove 502 and a guide hole 503 communicating with the mounting groove 502. The guide hole 503 is coaxially arranged with the fixing hole 404. The guide member 600 includes a guide shaft 601 and a bushing 602. The bushing 602 is paired and installed in the guide hole 503. One end of the guide shaft 601 passes through the bushing 602 and is fixedly connected to the fixing hole 404. The other end of the guide shaft 601 forms a limiting part 603, so that the needle tip 500 can move closer to or further away from the positioning flange 402. The elastic member 700 can provide the needle tip 500 with a continuous elastic force that moves away from the positioning flange 402, so that the needle tip 500 is pushed out along the axial direction of the guide shaft 601 through the bushing 602.

[0062] Specifically, the cooperation between the guide hole 503, the guide shaft 601, and the bushing 602 ensures the straightness of the needle tip 500 during movement, avoiding deviation or jamming. The elastic force of the elastic element 700 causes the needle tip 500 to automatically push out when no external force is applied, keeping the needle tip 500 in the initial state of being pushed out. When the coiled needle compresses the needle tip 500 due to the change in diameter, the needle tip 500 can retract in the opposite direction along the guide shaft 601. By dynamically adjusting the contact state with the coiled needle through the adaptive gap, a stable locking mechanism is achieved, thereby adapting to the changes in winding radius caused by materials of different thicknesses and improving problems such as uneven tension and wrinkles caused by the fixed locking structure.

[0063] The needle tip 500 and the positioning flange 402 are both provided with grooves on their inner sides, so that the end of the elastic element 700 can be inserted into the groove to complete the installation of the elastic element 700.

[0064] The inner wall of the sleeve hole 501 is provided with an inclined clamping surface 504, which forms a figure-eight shape with the positioning surface 406. The engagement of the clamping surface 504 and the positioning surface 406 allows the gap between them to automatically adjust with changes in the diameter of the coiling needle when the coiling needle presses against the nozzle 500, creating an adaptive locking effect. This ensures stable fixation of the coiling needle and allows the contact surface to dynamically adjust when the material thickness fluctuates, preventing loosening of the lock or localized stress concentration due to diameter mismatch, thus improving the stability of the winding process.

[0065] A cam driver 3000 is connected to the drive base 100 via a drive unit 101. The cam driver 3000 provides precise drive control, ensuring smooth and controllable axial extension and retraction of the telescopic shaft 300, adapting to the requirements for extension and retraction accuracy during adaptive diameter change, and avoiding positioning deviations of the winding needle due to unstable drive, thereby improving the accuracy and consistency of winding radius adjustment.

[0066] Specifically, the cam driver 3000 contacts an external drive source, which in turn contacts the cam driver 3000 and applies a squeezing pressure, allowing the telescopic shaft 300 to move axially along the bushing 200. When the applied squeezing pressure is removed, the reset member 800 can drive the telescopic shaft 300 to reset via the connected reset member 800.

[0067] A reset member 800 is provided between the bushing 200 and the drive seat. The reset member 800 is sleeved and installed on the telescopic shaft 300. The reset member 800 can provide the drive seat with an elastic force to drive the telescopic shaft to continuously contract.

[0068] The reset component 800 enables the telescopic shaft 300 to automatically retract to its initial state when no external force is applied. When it needs to be pushed out, it can overcome the elastic force through external force to achieve telescopic extension and retraction. This can adapt to the dynamic squeezing requirements of the coiling needle during the diameter change process, avoid structural damage caused by hard collision of the telescopic shaft 300, and at the same time maintain the smoothness of the telescopic action and improve the reliability of adaptive adjustment.

[0069] Specifically, two spring retaining rings 4000 are sleeved on the telescopic shaft 300. The two spring retaining rings 4000 contact the bushing 200 and the drive seat respectively, so that the two ends of the reset member 800 contact the spring retaining rings 4000 respectively.

[0070] Multiple elastic elements 700 are provided, and the multiple elastic elements 700 are arranged in a circular interval between the needle nozzle 500 and the positioning flange 402. The reset element 800 and the elastic elements 700 are both made of springs.

[0071] The arrangement of multiple elastic elements 700 at circumferential intervals ensures that the needle tip 500 is subjected to uniform force during contraction and ejection, avoiding the offset or jamming of the needle tip 500 caused by uneven local force; the elastic characteristics of the spring can provide a continuous and stable restoring force, so that the needle tip 500 always maintains the tendency to move in the ejection direction, thereby forming a stable dynamic lock with the coiled needle during the adaptive diameter change process.

[0072] Both the reset element 800 and the elastic element 700 are made of springs.

[0073] The specific usage process in this embodiment is as follows:

[0074] The telescopic shaft 300 can reciprocate along the axial direction of the bushing 200, as shown in the reference. Figure 6 The locking mechanism can contact the external needle winding mechanism under the drive of the drive source. The needle nozzle 500 on the locking mechanism can dynamically match the opening radius of different needle winding mechanisms. The needle nozzle 500 is connected to the positioning flange 402 through the guide 600 and can move along the guide 600. When the needle is squeezed by the needle winding, the needle nozzle 500 can generate reverse contraction (i.e., move closer to the positioning flange 402). When the telescopic shaft 300 drives the inner needle shaft 400 to abut against the needle winding, the needle nozzle 500 actively adapts to the winding. The change in needle diameter maintains a tight fit with the winding needle, preventing the locking mechanism from loosening or falling off due to fluctuations in the winding diameter. The sleeve hole 501 inside the needle tip 500 forms an adaptive gap with the outer side of the inner needle top block 401, allowing the inner needle top block 401 and the sleeve hole 501 to make fine adjustments according to the actual size or local deformation of the winding needle when they abut against it. This achieves adaptive fit and effectively solves the problems of winding wrinkles, misalignment, or local loosening caused by differences in electrode and diaphragm thickness, thereby improving the consistency and production efficiency of battery cell winding products.

[0075] 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. An adaptive variable diameter needle coil locking mechanism, comprising a drive base and a telescopic assembly, characterized in that: The telescopic assembly consists of a bushing and a telescopic shaft coaxially connected to the bushing. One end of the telescopic shaft is connected to the drive seat, and the other end of the telescopic shaft extends outward through the bushing, allowing the telescopic shaft to reciprocate along the axial direction of the bushing. The telescopic shaft is a hollow shaft, and a rotatable inner needle shaft is connected inside the telescopic shaft. One end of the inner needle shaft is exposed outside the telescopic shaft and forms an inner needle top block. The end of the inner needle shaft near the inner needle top block is connected to a needle nozzle through a positioning flange. The needle nozzle is connected to the positioning flange through a guide, allowing the needle nozzle to move along the guide to approach or move away from the positioning flange. An elastic element is provided between the needle nozzle and the positioning flange to provide a continuous force to the needle nozzle. The inside of the needle nozzle is provided with a sleeve hole for mating and inserting the inner needle top block. The inner wall of the sleeve hole and the outer side of the inner needle top block form an adaptive gap. When the telescopic shaft is pushed out axially, the inner needle top block and the sleeve hole can be used to hold the coiled needle, while the coiled needle applies pressure to the needle tip to cause the needle tip to retract in the opposite direction, and locks with the coiled needle through the adaptive gap.

2. The adaptive variable diameter needle coil locking mechanism according to claim 1, characterized in that: One end of the drive seat has a connecting hole for mounting a telescopic shaft, and one end of the telescopic shaft is inserted into the connecting hole. The outer side of the drive seat has a limiting hole for fixing the telescopic shaft.

3. The adaptive variable diameter needle coil locking mechanism according to claim 2, characterized in that: The end of the bushing near the inner needle top block has a mounting flange, and the mounting flange has a mounting hole for connection. The end of the telescopic shaft near the inner needle top block is connected to a stop block.

4. The adaptive variable diameter needle coil locking mechanism according to claim 3, characterized in that: The telescopic shaft is internally fitted with a bearing, and one end of the inner needle shaft forms a rotating part. The rotating part is coaxially connected with the bearing, so that the rotating part passes through the telescopic shaft. One end of the rotating part passes through the mounting hole along the axial direction of the telescopic shaft and is connected to a fixing ring. The positioning flange is set between the rotating part and the inner needle top block, and a fixing hole is opened on the positioning flange.

5. The adaptive variable diameter needle coil locking mechanism according to claim 1, characterized in that: The inner needle top block is inserted into the sleeve hole. The inner needle top block has a positioning hole that communicates with the outside. The positioning hole passes through the sleeve hole and communicates with the outside. The outer side of the inner needle top block is provided with an inclined positioning surface.

6. The adaptive variable diameter needle coil locking mechanism according to claim 4, characterized in that: The needle tip has a mounting groove and a guide hole that communicates with the mounting groove. The guide hole and the fixing hole are coaxially arranged. The guide component includes a guide shaft and a bushing. The bushing is paired and installed in the guide hole. One end of the guide shaft passes through the bushing and is fixedly connected to the fixing hole. The other end of the guide shaft forms a limiting part, so that the needle tip can move closer to or further away from the positioning flange. The elastic element can provide the needle tip with a continuous elastic force that moves away from the positioning flange, so that the needle tip is pushed out along the axial direction of the guide shaft through the bushing.

7. The adaptive variable diameter needle coil locking mechanism according to claim 5, characterized in that: The inner wall of the sleeve hole is provided with an inclined clamping surface, and the clamping surface and the positioning surface are in a figure-eight shape.

8. The adaptive variable diameter needle coil locking mechanism according to any one of claims 1-7, characterized in that: A cam driver is connected to the drive unit via a drive section.

9. The adaptive variable diameter needle coil locking mechanism according to any one of claims 1-7, characterized in that: A reset component is provided between the bushing and the drive seat. The reset component is sleeved and installed on the telescopic shaft. The reset component can provide the drive seat with an elastic force that drives the telescopic shaft to continuously contract.

10. The adaptive variable diameter needle buckle mechanism according to claim 9, characterized in that: The elastic element is provided in multiple ways, and the multiple elastic elements are arranged in a circular interval between the needle tip and the positioning flange. The reset element and the elastic element are both made of springs.

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