Double-acting self-adapting variable diameter lock mechanism

Abstract

This utility model relates to a secondary-propellant adaptive variable-diameter locking mechanism in the field of needle winding locking mechanisms. It includes a mounting plate, a drive base, and a telescopic assembly. The telescopic assembly consists of a bushing and a telescopic shaft coaxially connected to the bushing. A rotatable inner needle shaft is connected inside the telescopic shaft, and an inner needle top block is formed at one end of the inner needle shaft. The inner needle shaft is connected to an axially movable needle nozzle via a positioning flange. A locking push block is provided between the bushing and the needle nozzle. The needle nozzle has a sleeve hole for mating with and passing through 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. A push rod is connected to the mounting plate via a telescopic drive component to continuously apply locking force to the needle nozzle by driving the locking push block. This utility model uses the telescopic drive component to drive the locking push block to move secondary towards the needle nozzle, subjecting the needle nozzle to a continuous pushing force, thereby improving the stability and reliability of the locking process and ensuring consistent winding quality and precision.

Description

Technical Field

[0001] This utility model relates to the field of needle coil locking mechanisms, specifically to a secondary-propellant adaptive variable diameter 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. However, the existing needle winding locking mechanism, through the self-adaptation of the elastic element, has a poor pushing effect during the drive ejection process due to the resistance of the elastic element. Therefore, developing a stable and reliable self-adaptive variable diameter needle winding locking mechanism 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 defects by providing a secondary-propellant adaptive variable-diameter locking mechanism. This addresses the technical problems in the prior art where existing locking mechanisms suffer from poor structural stability, are affected by resistance during the pushing process, and exhibit poor pushing and locking effects with the winding needle, thus impacting the consistency and precision of product winding production.

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

[0007] The adaptive variable diameter locking mechanism with secondary propulsion includes a mounting plate, 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 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 protrudes outside the telescopic shaft and forms an inner needle top block. The end of the inner needle shaft near the inner needle top block... A needle tip that can move axially is connected via a positioning flange. A locking push block is provided between the bushing and the needle tip. The locking push block is coaxially connected to the inner needle shaft through a receiving cavity, so that the positioning flange is built into the receiving cavity. The needle tip passes through the receiving cavity and connects to the positioning flange via a guide. The inside of the needle tip 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. A push rod for driving the locking push block to continuously apply locking force to the needle tip is connected to the mounting plate via a telescopic drive.

[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. At the same time, the coiled needle applies pressure to the needle tip, causing the needle tip to retract in the opposite direction. Through the adaptive clearance matching of the coiled needle, the telescopic drive causes the locking push block to apply a force to the needle tip for locking the coiled needle.

[0009] Furthermore, as described above, the needle tip is provided with a through guide hole, and 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 enters the receiving cavity to be fixedly connected with the positioning flange. 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.

[0010] The guide shaft and bushing work together to provide precise guidance for the axial movement of the needle tip relative to the positioning flange. Compared with the elastic force of existing elastic elements, it reduces the resistance during the movement process, ensuring that the needle tip can smoothly contract or expand according to the change of the needle diameter, avoiding adaptive diameter change failure caused by movement jamming, and improving the stability and response speed of the diameter change process.

[0011] Furthermore, as described above, one end of the drive seat is formed with a connecting hole for mounting the telescopic shaft, one end of the telescopic shaft is paired and inserted into the connecting hole, the outer side of the drive seat is provided with a limiting hole for fixing the telescopic shaft, the end of the bushing near the inner needle top block is formed with a mounting flange, the mounting flange is provided with a mounting hole for connection, and the end of the telescopic shaft near the inner needle top block is connected with a stop block.

[0012] By using the connection hole and the limiting hole, the telescopic shaft and the drive seat are stably installed, 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 telescopic shaft fixing.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] Furthermore, as described above, one end of the locking push block contacts the mounting flange, and the other end of the locking push block contacts the needle tip. The locking push block is sleeved with the inner needle shaft through the receiving cavity, so that the inner needle top block of the inner needle shaft extends into the sleeve hole through the locking push block. A pushing part is formed on the locking push block.

[0017] The locking push block acts as a force transmitter, with one end contacting the mounting flange and the other end contacting the needle tip. It is sleeved with the inner needle shaft through a receiving cavity, the depth of which is greater than the thickness of the positioning flange. The locking push block is positioned between the mounting flange and the needle tip, allowing the pushing part to effectively transmit the thrust of the telescopic drive to the needle tip, achieving a continuous locking thrust on the coiled needle and improving the reliability and continuity of the locking effect. At the same time, when the telescopic drive removes the thrust applied to the locking push block, the needle tip can move the locking push block closer to the mounting flange through the contraction of the telescopic shaft.

[0018] Furthermore, as described above, the side of the mounting plate is connected to a bearing connecting seat, and one end of the push rod is connected to the bearing connecting seat, so that the push rod can rotate and swing around the bearing connecting seat under the drive of the telescopic drive component.

[0019] The bearing connection seat allows the push rod to rotate and swing around it under the drive, reducing the frictional resistance during the swinging process of the push rod, ensuring that the thrust of the telescopic drive component can be smoothly transmitted to the locking push block, and improving the thrust transmission efficiency and the smoothness of the operation.

[0020] Furthermore, as described above, the telescopic drive component is composed of a drive cylinder, and the telescopic shaft of the drive cylinder is connected to a push rod, so that the drive cylinder can drive the push rod to apply a thrust to the locking push block.

[0021] Using a drive cylinder as the telescopic drive component provides a stable and controllable driving force, avoiding the instability of thrust caused by elastic fatigue or resistance changes in the elastic component. This ensures that the push rod can continuously and evenly apply the locking thrust to the locking push block, solving the problem of the resistance of the existing elastic component affecting the pushing effect and improving the stability and reliability of the locking mechanism.

[0022] 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.

[0023] The positioning hole can be matched with the external coiling needle structure. The inclined positioning surface and the inner wall of the sleeve hole form an adaptive gap. When the coiling needle needs to change diameter due to changes in material thickness, the inclined matching of the positioning surface and the sleeve hole can dynamically adjust the gap size. The coiling needle squeezes the needle nozzle to generate reverse contraction. The telescopic drive can drive the push rod to apply the pushing force of the locking push block to the needle nozzle and the coiling needle lock, thereby adapting to different winding radii and solving the problem that fixed diameter coiling needles cannot adapt to material thickness fluctuations.

[0024] 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.

[0025] 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.

[0026] Furthermore, as described above, a cam driver is connected to the drive unit via a drive section on the drive base. The cam driver provides precise drive control, ensuring smooth and controllable axial extension and retraction of the telescopic shaft, adapting to the requirements for extension and retraction accuracy during adaptive diameter changes, avoiding positioning deviations of the winding needle due to drive instability, and improving the accuracy and consistency of winding radius adjustment.

[0027] The beneficial effects of this utility model are as follows: The telescopic shaft initially moves along the bushing towards the winding needle mechanism, causing the inner needle top block and the needle tip to contact and form initial positioning against the winding needle. At this time, an adaptive gap is formed between the sleeve hole and the inner needle top block. When the needle tip is subjected to reverse pressure from the winding needle, the needle tip can retract based on the adaptive gap and automatically adapt to the actual size of the winding needle. Furthermore, the extension of the telescopic drive component allows for a secondary forward movement, causing the locking push block to be subjected to a continuous pushing force applied by the push rod towards the needle tip. The sleeve hole of the needle tip and the inner needle top block form a locking force on the winding needle. Through the sleeved installation and axially movable setting of the locking push block, the resistance phenomenon is reduced when the telescopic shaft initially moves towards the winding needle, avoiding the influence of the elastic element's resistance on the pushing effect. This significantly improves the stability and reliability of the locking process, effectively solving the problem that fixed-diameter winding needles cannot dynamically adjust their winding radius due to batch differences in the coating thickness of the positive and negative electrode sheets, the thickness of the diaphragm substrate, or process fluctuations, thus improving the consistency and accuracy of winding quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure in the first direction of this embodiment;

[0029] Figure 2 This is a schematic diagram of the overall structure in the second direction of this embodiment;

[0030] Figure 3 This is a schematic diagram of the connection structure of the telescopic component in this embodiment;

[0031] Figure 4 This is a cross-sectional view of the telescopic component in this embodiment;

[0032] Figure 5 This is a cross-sectional view of the retracted state of the locking push block in this embodiment;

[0033] Figure 6 This is a cross-sectional view of the locking push block in its secondary pushing and usage state in this embodiment;

[0034] Figure 7 This is a schematic diagram of a partial explosion in this embodiment;

[0035] Figure 8 This is a schematic diagram illustrating the connection and use of the locking mechanism in this embodiment;

[0036] The reference numerals in the figure are as follows:

[0037] 100-Drive base, 101-Drive unit, 102-Connecting hole, 103-Limiting hole;

[0038] 200-Sleeve, 201-Mounting flange, 202-Mounting hole;

[0039] 300 - Telescopic shaft, 301 - Guide groove;

[0040] 400-Inner needle shaft, 401-Inner needle top block, 402-Positioning flange, 403-Rotating part, 404-Fixing hole, 405-Positioning hole, 406-Positioning surface;

[0041] 500 - Needle tip, 501 - Sleeve hole, 502 - Guide hole, 503 - Clamping surface;

[0042] 600-Guide component, 601-Guide shaft, 602-Bushing, 603-Limiting part;

[0043] 700-Lock push block, 701-Receiving cavity, 702-Pushing part;

[0044] 800 - Reset component, 900 - Stop block;

[0045] 1-Mounting plate, 2-Telescopic drive component, 3-Push rod, 4-Bearing connector, 5-Rotating shaft, 6-Support frame, 7-Upright plate. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] 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.

[0048] 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.

[0049] In this embodiment, refer to Figures 1-8The specific implementation of the adaptive variable diameter locking mechanism includes a mounting plate 1, 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 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 needle top block 401. The end of the inner needle shaft 400 near the inner needle top block 401 passes through... The positioning flange 402 is connected to a needle tip 500 that can move axially. A locking push block 700 is provided between the bushing 200 and the needle tip 500. The locking push block 700 is coaxially connected to the inner needle shaft 400 through the receiving cavity 701, so that the positioning flange 402 is built into the receiving cavity 701. The needle tip 500 passes through the receiving cavity 701 and is connected to the positioning flange 402 through the guide 600. The needle tip 500 has a sleeve hole 501 for mating and passing through the inner needle top block 401. The inner wall of the sleeve hole 501 and the outer side of the inner needle top block 401 form an adaptive gap. The mounting plate 1 is connected to a push rod 3 through the telescopic drive 2 for driving the locking push block 700 to continuously apply a locking force to the needle tip 500.

[0050] 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. At the same time, the coiled needle applies pressure to the needle nozzle 500, causing the needle nozzle 500 to retract in the opposite direction. Through the adaptive clearance matching of the coiled needle, the drive of the telescopic drive 2 causes the locking push block 700 to apply a force to the needle nozzle 500 for locking the coiled needle.

[0051] Specifically, in this embodiment, the bushing 200 and the telescopic shaft 300 are ball splines. The bushing 200 forms a spline nut, and the telescopic shaft 300 forms a hollow spline shaft. A guide groove 301 distributed axially is provided on the outer side of the spline shaft. The inner side of the spline nut is paired with the guide groove 301 by ball bearings, so that the spline shaft can reciprocate along the axial direction of the spline nut.

[0052] Reference Figures 4-7 The needle tip 500 has a through guide hole 502. The guide member 600 includes a guide shaft 601 and a bushing 602. The bushing 602 is installed in the guide hole 502. One end of the guide shaft 601 passes through the bushing 602 and enters the receiving cavity 701 to be fixedly connected to the positioning flange 402. 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.

[0053] The guide shaft 601 and bushing 602 work together to provide precise guidance for the axial movement of the needle nozzle 500 relative to the positioning flange 402. Compared with the influence of the elastic force of existing elastic elements, the resistance during the movement is reduced, ensuring that the needle nozzle 500 can smoothly contract or expand according to the change of the needle diameter, avoiding adaptive diameter change failure caused by movement jamming, and improving the stability and response speed of the diameter change process.

[0054] Specifically, multiple sets of guide members 600 are provided, and these multiple sets of guide members 600 are circumferentially distributed to ensure the axial stable and reliable movement of the needle nozzle 500 and the locking push block 700.

[0055] Reference Figure 5 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. The outer side of the drive seat 100 is provided with a limiting hole 103 for fixing the telescopic shaft 300. The end of the bushing 200 near the inner needle top block 401 is formed with a mounting flange 201. The mounting flange 201 is provided with a mounting hole 202 for connection. The end of the telescopic shaft 300 near the inner needle top block 401 is connected with a stop block 900.

[0056] By cooperating with the connecting hole 102 and the limiting hole 103, the telescopic shaft 300 and the drive seat 100 are stably installed, 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.

[0057] 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.

[0058] Reference Figures 4-6 The telescopic shaft 300 is internally fitted with a bearing, and one end of the inner needle shaft 400 forms a rotating part 403. The rotating part 403 is coaxially connected with the bearing, 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 with a fixing ring. The positioning flange 402 is disposed between the rotating part 403 and the inner needle top block 401, and a fixing hole 404 is provided on the positioning flange 402.

[0059] The coaxial connection between the bearing and the rotating part 403 allows the inner needle shaft 400 to rotate stably within the telescopic shaft 300, reducing rotational friction and ensuring the smoothness of the inner needle shaft 400 when rotating with the needle coil; the positioning flange 402 can move relative to the stop block 900 to approach or move away from the mating.

[0060] Reference Figure 5One end of the locking push block 700 contacts the mounting flange 201, and the other end of the locking push block 700 contacts the needle tip 500. The locking push block 700 is sleeved with the inner needle shaft 400 through the receiving cavity 701, so that the inner needle top block 401 of the inner needle shaft 400 extends into the sleeve hole 501 through the locking push block 700. A pushing part 702 is formed on the locking push block 700.

[0061] The locking push block 700 serves as a force transmitter, with one end contacting the mounting flange 201 and the other end contacting the needle tip 500. It connects to the inner needle shaft 400 sleeve 200 through the receiving cavity 701, the depth of which is greater than the thickness of the positioning flange 402. The locking push block 700 is positioned between the mounting flange 201 and the needle tip 500, allowing the pushing part 702 to effectively transmit the thrust of the telescopic drive 2 to the needle tip 500, thereby achieving a continuous locking thrust on the coiled needle and improving the reliability and continuity of the locking effect. At the same time, when the telescopic drive 2 withdraws and applies thrust to the locking push block 700, the retraction of the telescopic shaft 300 causes the needle tip 500 to move closer to the mounting flange 201.

[0062] Reference Figures 1-2 The mounting plate 1 has a bearing connecting seat 4 connected to its side. One end of the push rod 3 is connected to the bearing connecting seat 4, allowing the push rod 3 to rotate and swing around the bearing connecting seat 4 under the drive of the telescopic drive component 2. The bearing connecting seat 4 allows the push rod 3 to rotate and swing around it under the drive, reducing the frictional resistance during the swinging process of the push rod 3, ensuring that the thrust of the telescopic drive component 2 can be smoothly transmitted to the locking push block 700, and improving the thrust transmission efficiency and the smoothness of the operation.

[0063] The telescopic drive component 2 is composed of a drive cylinder. The telescopic shaft 300 of the drive cylinder is connected to the push rod 3, so that the drive cylinder can drive the push rod 3 to apply a thrust to the locking push block 700.

[0064] Using a drive cylinder as the telescopic drive component 2 provides a stable and controllable driving force, avoiding the instability of thrust caused by elastic fatigue or resistance changes in the elastic component. This ensures that the push rod 3 can continuously and evenly apply the locking thrust to the locking push block 700, solving the problem of the resistance of the existing elastic component affecting the pushing effect and improving the stability and reliability of the locking.

[0065] Specifically, there are two drive cylinders, which are installed on both sides of the mounting plate 1. The telescopic shafts 300 of the two drive cylinders are connected to a push rod 3, and the telescopic direction of the telescopic shafts 300 of the two drive cylinders extends toward the locking push block 700.

[0066] 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.

[0067] The positioning hole 405 can cooperate with the external coiling needle structure. The inclined positioning surface 406 and the inner wall of the sleeve hole 501 form an adaptive gap. When the coiling 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. The coiling needle squeezes the needle nozzle 500 to generate reverse contraction. The telescopic drive 2 can drive the push rod 3 to make the locking push block 700 apply a pushing force to the needle nozzle 500 and the coiling needle lock, thereby adapting to different winding radii and solving the problem that fixed diameter coiling needles cannot adapt to material thickness fluctuations.

[0068] Reference Figures 5-6 The inner wall of the sleeve hole 501 is provided with an inclined clamping surface 503, and the clamping surface 503 and the positioning surface 406 are in a figure-eight shape.

[0069] The engagement of the clamping surface 503 and the positioning surface 406 allows the gap between them to automatically adjust with the change in the diameter of the coiling needle when the coiling needle presses against the nozzle 500, 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.

[0070] A cam driver is connected to the drive base 100 via a drive unit 101. The cam driver 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, avoiding positioning deviations of the winding needle due to unstable drive, and improving the accuracy and consistency of winding radius adjustment.

[0071] A reset member 800 is provided between the bushing 200 and the drive seat 100. The reset member 800 is sleeved and installed on the telescopic shaft 300. The reset member 800 can provide the drive seat 100 with an elastic force to drive the telescopic shaft 300 to continuously contract.

[0072] When the drive seat 100 is subjected to driving thrust, the drive seat 100 can drive the telescopic shaft 300 to move along the axial direction of the bushing 200, so that the inner needle top block 401 of the inner needle shaft 400 is exposed. When the continuous thrust applied to the drive seat 100 is removed, the drive seat 100 can drive the telescopic shaft 300 to retract and reset through the elastic reset action of the reset member 800.

[0073] Specifically, two spring retaining rings are sleeved on the telescopic shaft 300. The two spring retaining rings contact the shaft sleeve 200 and the drive seat 100 respectively, so that both ends of the reset member 800 contact the spring retaining rings respectively.

[0074] The specific usage process in this embodiment is as follows:

[0075] Reference Figure 8 The locking mechanism is connected to the support frame 6 via the bushing 200. There are three sets of locking mechanisms, which are arranged in a circular pattern. The locking mechanism is connected to the support frame 6 via the rotating shaft 5, and the support frame 6 can drive the three sets of locking mechanisms to rotate at intervals. One end of the rotating shaft 5 is connected to the upright plate 7, and the upright plate 7 is provided with a drive source for applying thrust to the drive seat 100.

[0076] One-step advance: The locking mechanism can be pushed out and contacted by 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, so that the needle nozzle 500 can generate reverse contraction (i.e. move closer to the positioning flange 402) when it is squeezed by the needle winding. Specifically, when the drive seat 100 drives the telescopic shaft 300 and drives the inner needle shaft 400 to move axially and abut against the needle winding, the movable setting of the needle nozzle 500 can actively adapt to the change in diameter of the needle winding and maintain the tight fit between the sleeve hole 501 and the needle winding.

[0077] Secondary push: Due to the axial movement of the locking push block 700, the stability of the inner needle shaft 400 is ensured, as well as the reverse contraction effect when the needle tip 500 contacts the coiled needle. At this time, the push rod 3 is driven by the drive cylinder. The push rod 3 rotates around the bearing connecting seat 4 and one end of the push rod 3 contacts the push part 702. Thus, the locking push block 700 can apply a continuous clamping force to the needle tip 500, thereby ensuring the adaptive adjustment of the coiled needle. Compared with the elastic element provided in the needle tip 500 and the positioning flange 402, the resistance of the needle tip 500 in reverse contraction can be eliminated, ensuring the stable and reliable adaptive operation.

[0078] At this time, the sleeve hole 501 of the needle tip 500 and the outer side of the inner needle top block 401 form an adaptive gap, so that when the inner needle top block 401 and the sleeve hole 501 abut against the winding needle, the clamping surface 503 and the positioning surface 406 make fine adjustments according to the actual size or local deformation of the winding needle to achieve adaptive cooperation. This effectively solves the problems of winding wrinkles, misalignment or local loosening caused by the difference in thickness of the electrode sheet and the separator, and improves the consistency and production efficiency of the battery cell winding products.

[0079] 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 secondary-propellable adaptive variable-diameter locking mechanism, comprising a mounting plate, 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 an axially movable needle nozzle through a positioning flange. A locking push block is provided between the bushing and the needle nozzle. The locking push block is coaxially connected to the inner needle shaft through a receiving cavity, so that the positioning flange is built into the receiving cavity. The needle nozzle passes through the receiving cavity through a guide and is connected to the positioning flange. 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. A push rod for driving the locking push block to continuously apply locking force to the needle nozzle is connected to the mounting plate through a telescopic drive. 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. At the same time, the coiled needle applies pressure to the needle tip, causing the needle tip to retract in the opposite direction. Through the adaptive clearance matching of the coiled needle, the telescopic drive causes the locking push block to apply a force to the needle tip for locking the coiled needle.

2. The adaptive variable diameter locking mechanism with secondary propulsion as described in claim 1, characterized in that: The needle tip has a through guide hole. The guide component includes a guide shaft and a bushing. The bushing is installed in the guide hole. One end of the guide shaft passes through the bushing and is fixedly connected to the positioning flange in the receiving cavity. 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.

3. The adaptive variable diameter locking mechanism with secondary propulsion as described in claim 1, characterized in that: One end of the drive seat has a connecting hole for mounting the telescopic shaft. 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. The end of the bushing near the inner needle top block has a mounting flange. 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 locking mechanism with secondary propulsion as described in claim 3, characterized in that: One end of the locking push block contacts the mounting flange, and the other end of the locking push block contacts the needle tip. The locking push block is sleeved with the inner needle shaft through the receiving cavity, so that the inner needle top block of the inner needle shaft extends into the sleeve hole through the locking push block. A pushing part is formed on the locking push block.

5. The adaptive variable diameter locking mechanism with secondary propulsion according to claim 4, characterized in that: The mounting plate is connected to a bearing mounting seat on its side, and one end of the push rod is connected to the bearing mounting seat, so that the push rod can rotate and swing around the bearing mounting seat under the drive of the telescopic drive component.

6. The adaptive variable diameter locking mechanism with secondary propulsion according to claim 5, characterized in that: The telescopic drive component is composed of a drive cylinder. The telescopic shaft of the drive cylinder is connected to the push rod, so that the drive cylinder can drive the push rod to apply a thrust to the locking push block.

7. The adaptive variable diameter locking mechanism with secondary propulsion 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.

8. The adaptive variable diameter locking mechanism with secondary propulsion according to claim 7, 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.

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

10. The adaptive variable diameter locking mechanism with secondary propulsion according to any one of claims 1-8, 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 to drive the telescopic shaft to continuously contract.

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