A winding needle, a winding device and a winding machine

Abstract

The present invention provides a winding needle, a winding device and a winding machine, which belong to the technical field of lithium battery manufacturing equipment, and include: a syringe, a mounting groove is provided on the barrel wall of the syringe; an expansion part, movably arranged in the mounting groove, the expansion part having a retracted position and a support position; a diaphragm fixing structure; an inertia holding structure, inserted in the syringe and movably connected to the expansion part, the syringe can rotate relative to the inertia holding structure, and drive the expansion part to rotate, and under the action of the inertia holding structure, the expansion part is switched between the retracted position and the support position; a limiting structure, arranged between the syringe and the inertia holding structure, the limiting structure is suitable for fixing the relative position of the syringe and the inertia holding structure. The winding needle provided by the present invention is an approximately complete cylindrical structure in the circumferential direction, which ensures the overall rigidity of the winding needle while allowing the outer diameter of the winding needle to change. The winding needle does not need to be provided with additional support when in use, which simplifies the overall structure of the winding device.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing equipment, and in particular to a winding needle, a winding device and a winding machine. Background Art

[0002] Wound battery cells are adopted by many lithium battery manufacturers due to their advantages such as stable battery performance and high manufacturing efficiency. They account for a large share of the market, and therefore the demand for corresponding battery winding machines is also large.

[0003] During the production of lithium battery cells, a winding device is usually required to wind the diaphragm. In the prior art, the winding needle of the winding device usually consists of two inner needle halves and two outer needle halves. The two inner needle halves are used to clamp the ends of the diaphragm, and the two outer needle halves are used to support the diaphragm to form the reference internal dimensions when winding the battery cell. When the needle needs to be withdrawn, the diameter of the two outer needle halves is reduced, and the two inner needle halves loosen the diaphragm, and the battery cell can be removed from the winding needle. However, due to the half-structure of the winding needle, the rigidity of the winding needle is poor, so an additional support structure is required to provide auxiliary support for the winding needle, which makes the overall structure of the device complex. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor rigidity of the winding needle in the prior art, thereby providing a winding needle, a winding device and a winding machine.

[0005] In order to solve the above problems, the present invention provides a winding needle, comprising: a needle cylinder, a mounting groove is provided on the wall of the needle cylinder; an expansion part, movably arranged in the mounting groove, the expansion part has a retracted position located inside the mounting groove, and a support position at least partially located outside the mounting groove; a diaphragm fixing structure, suitable for cooperating with the needle cylinder to fix or loosen the diaphragm; an inertia holding structure, inserted in the needle cylinder and movably connected to the expansion part, the needle cylinder can rotate relative to the inertia holding structure, and drive the expansion part to rotate, and under the action of the inertia holding structure, the expansion part is converted between the retracted position and the support position; a limiting structure, arranged between the needle cylinder and the inertia holding structure, the limiting structure is suitable for fixing the relative position of the needle cylinder and the inertia holding structure.

[0006] Optionally, the inertia holding structure includes: a rotating rod inserted in the syringe, and the syringe can rotate around the rotating rod; a rotating plate connected to the rotating rod, a sliding groove is provided on the rotating plate, the expansion part is slidably connected to the sliding groove, and the inner wall of the sliding groove is a pushing surface, when the syringe rotates around the rotating rod, the pushing surface can push the expansion part to move in the mounting groove; an inertia enhancing part is arranged on the rotating rod.

[0007] Optionally, the expansion part includes an expansion block and a connecting column, the expansion block is slidably connected to the inner wall of the mounting groove, the connecting column is arranged on the inner side of the expansion block, and a plug is provided on the connecting column, the plug is inserted into the slide groove and is slidably connected to the pushing surface.

[0008] Optionally, the sliding groove is a waist-shaped groove or a waist-shaped hole.

[0009] Optionally, two expansion parts are provided, and two mounting grooves are also provided. The two expansion parts are provided at opposite ends of the rotating plate and correspond to the two mounting grooves respectively.

[0010] Optionally, a placement groove is further provided on the wall of the syringe, and the placement groove can allow the end of the diaphragm to penetrate; the diaphragm fixing structure includes a pressing part, one end of the pressing part is connected to the inertial holding structure, and the other end of the pressing part is arranged close to the inner wall of the syringe, and the other end of the pressing part and the inner wall of the syringe are suitable for fixing the diaphragm.

[0011] Optionally, the pressing part includes a mounting plate, a connecting plate and a pressing strip, the mounting plate is connected to the inertial retaining structure, and several mounting plates are arranged at intervals, the connecting plate connects several mounting plates at the same time, and the pressing strip is arranged on the side of the connecting plate away from the mounting plate.

[0012] Optionally, the limiting structure includes at least one ball plunger, the fixed end of the ball plunger is connected to the inner wall of the syringe, and at least two limiting grooves are provided on the inertial holding structure. When the tightening part is in the retracted position, the ball head of at least one ball plunger is suitable for being inserted into one of the limiting grooves, and when the tightening part is in the supporting position, the ball head of at least one ball plunger is suitable for being inserted into the other limiting groove.

[0013] Optionally, there are two ball plungers, which are arranged side by side along the axial direction of the syringe, and there are two limiting grooves, which are staggered along the axial and circumferential directions of the inertial retaining structure. When the expansion part is in the retracted position, the ball head of one ball plunger is suitable for being inserted into one of the limiting grooves, and when the expansion part is in the supporting position, the ball head of the other ball plunger is suitable for being inserted into the other limiting groove.

[0014] Optionally, a cutting groove is provided on the outer wall of the syringe.

[0015] Optionally, the outer side of the expansion portion is recessed inward to form a receiving groove.

[0016] The present invention also provides a winding device comprising the above-mentioned winding needle.

[0017] Optionally, the winding device also includes: a film pressing mechanism, which is suitable for pressing the diaphragm onto the outer wall of the syringe; a film pushing mechanism, which is suitable for pushing the end of the diaphragm into the syringe from the placement groove opened on the syringe; and a film cutting mechanism, which is suitable for cutting the diaphragm on the side of the film pushing mechanism away from the film pressing mechanism.

[0018] Optionally, the film pressing mechanism includes a one-way wheel and a first driving unit, the first driving unit is suitable for driving the one-way wheel to approach or move away from the syringe; and / or, the film pushing mechanism includes a push plate and a second driving unit, the second driving unit is suitable for driving the push plate to insert into or move out of the placement slot; and / or, the film cutting mechanism includes a cutter and a third driving unit, the third driving unit is suitable for driving the cutter to approach or move away from the syringe.

[0019] Optionally, the winding device further includes a fourth drive unit, which is transmission-connected to the film pressing mechanism, the film pushing mechanism and the film cutting mechanism, and is suitable for driving the film pressing mechanism, the film pushing mechanism and the film cutting mechanism to approach or move away from the winding needle at the same time.

[0020] The present invention also provides a winding machine comprising the above-mentioned winding device.

[0021] The present invention has the following advantages:

[0022] 1. The present invention provides a winding needle, comprising a needle cylinder and an expansion portion. When the needle cylinder is instantaneously accelerated, the inertial force of the inertial holding structure is utilized to keep the inertial holding structure stationary, thereby causing the needle cylinder to rotate a certain angle relative to the inertial holding structure. During the needle cylinder's rotation, the expansion portion is moved by interaction with the inertial holding structure. Furthermore, a limiting structure is utilized to fix the relative position of the needle cylinder and the inertial holding structure, so that when the needle cylinder rotates smoothly for winding, it can drive the inertial holding structure to rotate synchronously, ensuring that the expansion portion remains in position. Therefore, the winding needle presents an approximately complete cylindrical structure in the circumferential direction, which allows the outer diameter of the winding needle to vary while ensuring its overall rigidity. The winding needle does not require additional support when in use, simplifying the overall structure of the winding device.

[0023] 2. The present invention provides a winding needle, which increases the inertia of the inertia holding structure by arranging an inertia enhancement part on the rotating rod, so that when the needle cylinder is instantly accelerated and rotated, the inertia retention structure is ensured not to rotate with the needle cylinder under the action of the inertia enhancement part. Moreover, when the needle cylinder rotates, the inner wall of the slide groove is used as a pushing surface to push the expansion part to move in the installation groove. Therefore, the movement of the expansion part can be achieved by only utilizing the original drive of the needle cylinder. The driving method is simple and convenient, and the overall structure is simplified.

[0024] 3. The present invention provides a winding needle, in which the slide groove is set as a waist-shaped groove or a waist-shaped hole. The position of the expansion part can be changed when the plug slides along the slide groove. The slide groove can guide and limit the plug to ensure the smooth movement of the expansion part.

[0025] 4. The present invention provides a winding needle, in which two expansion parts are set and arranged at the opposite ends of the rotating plate, so that the two expansion parts are respectively located on the opposite sides of the needle cylinder, so that the expansion parts are supported at the symmetrical positions of the battery cell, so that the winding shape of the battery cell is more regular and the winding process is more stable.

[0026] 5. The present invention provides a winding needle, which connects a pressing part with an inertial holding structure. When the needle cylinder and the inertial holding structure rotate relative to each other, the expansion part moves to the supporting position, the pressing part also rotates relative to the needle cylinder, and the diaphragm is fixed between the pressing part and the inner wall of the needle cylinder, and winding can be performed. After the winding is completed, the needle cylinder rotates relative to the inertial holding structure in the opposite direction, the expansion part moves to the retracted position, and the pressing part cancels the pressure on the diaphragm, so that the battery cell can be removed from the winding needle. Therefore, by arranging the pressing part on the inertial holding structure, the expansion part and the pressing part can be operated synchronously, so that the expansion part and the pressing part can work together, simplifying the structure and working steps of the winding needle.

[0027] 6. The present invention provides a winding needle, which arranges several mounting plates at intervals, thereby ensuring a simple structure and light weight while ensuring the stability of the pressing process.

[0028] 7. The present invention provides a winding needle, which utilizes the cooperation between the ball plunger and the limiting groove to fix the relative position of the syringe and the inertial holding structure. Moreover, when the syringe is instantly accelerated, the ball plunger can be disengaged from the limiting groove under the action of the rotational force of the syringe, thereby facilitating the change of the relative position of the syringe and the inertial holding structure.

[0029] 8. The needle winding provided by the present invention avoids interference between the cutter and the syringe when cutting the diaphragm by providing a cutting knife groove on the outer wall of the syringe, thereby ensuring the integrity of the syringe and the cutter and the safety of the cutting process.

[0030] 9. The present invention provides a winding needle. When the battery cell is removed from the winding needle after winding is completed, the battery cell clamping rod can be inserted into the accommodating groove provided on the expansion part, so as to facilitate the removal of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A cross-sectional view of a winding needle provided by embodiment 1 of the present invention along the axial direction is shown;

[0033] Figure 2 A cross-sectional view of a winding needle provided by embodiment 1 of the present invention along a radial direction is shown;

[0034] Figure 3 A schematic structural diagram of the inertial holding structure and the pressing portion of the winding needle provided in Example 1 of the present invention is shown;

[0035] Figure 4 for Figure 3 A-direction view;

[0036] Figure 5 FIG2 shows a schematic structural diagram of a winding device provided in Example 2 of the present invention in a first state;

[0037] Figure 6 FIG2 shows a schematic structural diagram of a winding device provided in Example 2 of the present invention in a second state;

[0038] Figure 7 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the present invention when it is in the third state;

[0039] Figure 8 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the present invention when it is in the fourth state;

[0040] Figure 9 It shows a schematic structural diagram of the winding device provided by Example 2 of the present invention when it is in the fifth state.

[0041] Description of reference numerals:

[0042] 10. Syringe; 11. Mounting slot; 12. Placement slot; 13. Cutter slot; 14. Cylinder; 15. Base; 16. Cover; 20. Expansion part; 21. Expansion block; 22. Connecting column; 221. Plug; 23. Accommodation slot; 30. Inertia holding structure; 31. Rotating rod; 32. Rotating plate; 321. Slide; 33. Inertia reinforcement part; 34. Limiting groove; 40. Limiting structure; 50. Pressing part; 51. Mounting plate; 52. Connecting plate; 53. Pressing strip; 60. Film pressing mechanism; 61. One-way wheel; 62. First driving part; 70. Film pushing mechanism; 71. Pushing plate; 72. Second driving part; 80. Film cutting mechanism; 81. Cutter; 82. Third driving part; 90. Diaphragm. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] like Figures 1 to 4A specific embodiment of the winding needle shown includes: a needle cylinder 10, an expansion part 20, a diaphragm fixing structure, an inertia holding structure 30 and a limiting structure 40. A mounting groove 11 is provided on the wall of the needle cylinder 10, and the expansion part 20 is movably arranged in the mounting groove 11, and the expansion part 20 has a retracted position located inside the mounting groove 11, and a support position at least partially located outside the mounting groove 11. The diaphragm fixing structure is arranged corresponding to the needle cylinder 10 to cooperate with each other to fix the diaphragm 90 during winding, and to release the diaphragm 90 after the winding is completed. The inertia holding structure 30 is inserted into the needle cylinder 10 and is movably connected to the expansion part 20. The needle cylinder 10 can rotate relative to the inertia holding structure 30 and drive the expansion part 20 to rotate, and under the action of the inertia holding structure 30, the expansion part 20 is switched between the retracted position and the support position. The limiting structure 40 is disposed between the syringe 10 and the inertial holding structure 30 , and the limiting structure 40 can fix the relative position of the syringe 10 and the inertial holding structure 30 .

[0049] It is worth noting that the above-mentioned inertial holding structure 30 and the expansion part 20 are movably connected, including but not limited to sliding connection, hinge, etc., and the inertial holding structure 30 and the expansion part 20 can be directly connected or indirectly connected through other structures.

[0050] When the needle cylinder 10 is instantaneously accelerated, the inertial force of the inertial retaining structure 30 is used to keep the inertial retaining structure 30 stationary, thereby causing the needle cylinder 10 to rotate a certain angle relative to the inertial retaining structure 30. During the rotation of the needle cylinder 10, the expansion portion 20 moves under the interaction with the inertial retaining structure 30. Furthermore, the relative position of the needle cylinder 10 and the inertial retaining structure 30 is fixed by the limiting structure 40. This allows the needle cylinder 10 to rotate smoothly for winding, driving the inertial retaining structure 30 to rotate synchronously, ensuring that the expansion portion 20 remains in position. Therefore, the winding needle presents a nearly complete cylindrical structure in the circumferential direction. While the outer diameter of the winding needle can be varied, the overall rigidity of the winding needle is maintained. The winding needle does not require additional support during use, simplifying the overall structure of the winding device.

[0051] It is worth noting that in order to use the winding needle for the winding process, the syringe 10 is inherently connected to a rotational drive structure to drive the syringe 10 to rotate and wind the battery cell. In this embodiment, to achieve relative rotation between the syringe 10 and the inertial retaining structure 30, the syringe 10 is instantaneously accelerated by the rotational drive structure of the syringe 10. While the inertial retaining structure 30 is able to remain stationary due to its own inertial force, the syringe 10 can be rotated around the inertial retaining structure 30 by a certain angle. Therefore, the relative rotation between the syringe 10 and the inertial retaining structure 30 can be achieved without the need for an additional drive, simplifying the overall structure.

[0052] It should be further explained that the syringe 10 needs to be accelerated instantaneously only when the relative position of the syringe 10 and the inertial holding structure 30 needs to be changed. During the winding process, the syringe 10 is driven to rotate smoothly, and the relative position of the syringe 10 and the inertial holding structure 30 can be kept unchanged under the action of the limiting structure 40.

[0053] like Figure 1 and Figure 2 As shown, the inertia retaining structure 30 includes a rotating rod 31, a rotating plate 32, and an inertia enhancing portion 33. The inertia enhancing portion 33 is disposed on the rotating rod 31. The rotating rod 31 is inserted into the syringe 10, and the syringe 10 can rotate about the rotating rod 31. The rotating plate 32 is connected to the rotating rod 31 and has a slide groove 321 formed on the rotating plate 32. The expansion portion 20 is slidably connected to the slide groove 321. The inner wall of the slide groove 321 serves as a push surface. When the syringe 10 rotates about the rotating rod 31, the push surface can push the expansion portion 20 to move within the mounting groove 11.

[0054] By arranging an inertia enhancement portion 33 on the rotating rod 31 to increase the inertia of the inertia holding structure 30, when the syringe 10 accelerates and rotates instantaneously, under the action of the inertia enhancement portion 33, the inertia holding structure 30 is ensured not to rotate with the syringe 10. Moreover, when the syringe 10 rotates, the inner wall of the slide groove 321 is used as a pushing surface to push the expansion portion 20 to move in the mounting groove 11. Therefore, the movement of the expansion portion 20 can be achieved by only utilizing the original drive of the syringe 10. The driving method is simple and convenient, and the overall structure is simplified.

[0055] It is worth noting that the inertia enhancing portion 33 may be a weight-increasing block with a certain weight, so as to enhance the inertia by increasing the overall weight of the inertia retaining structure 30 .

[0056] like Figure 1 As shown, the syringe 10 includes a barrel 14 , a seat 15 and a cover 16 . The seat 15 and the cover 16 are respectively arranged at two ends of the barrel 14 , and the rotating rod 31 is inserted in the center of the seat 15 and the cover 16 .

[0057] like Figure 1 and Figure 2 As shown, the expansion portion 20 includes an expansion block 21 and a connecting post 22. The expansion block 21 is slidably connected to the inner wall of the mounting groove 11, and the connecting post 22 is disposed on the inner side of the expansion block 21. The connecting post 22 is provided with a plug 221, which is inserted into the slide groove 321 and slidably connected to the push surface.

[0058] In this embodiment, if Figure 2 As shown, the slide groove 321 is a waist-shaped groove or waist-shaped hole, the plug 221 is vertically connected to the connecting column 22, and the outer wall of the plug 221 is adapted to the inner wall of the slide groove 321.

[0059] The slide groove 321 is set as a waist-shaped groove or waist-shaped hole, and the plug 221 can realize the conversion of the position of the tightening part 20 when sliding along the slide groove 321. The slide groove 321 can guide and limit the plug 221 to ensure the smooth movement of the tightening part 20.

[0060] It is worth noting that when the syringe 10 rotates around the rotating rod 31, the expansion part 20 is driven to rotate together. When the expansion part 20 rotates, the plug 221 interacts with the pushing surface of the slide groove 321 to make the plug 221 slide in the slide groove 321, thereby causing the expansion part 20 to move in the installation groove 11.

[0061] Of course, as an alternative embodiment, the expansion part 20 and the inertial holding structure 30 can be connected by a connecting rod mechanism, and the two ends of the connecting rod mechanism are hinged to the expansion part 20 and the inertial holding structure 30 respectively. When the syringe 10 rotates, the expansion part 20 moves under the action of the connecting rod mechanism.

[0062] In this embodiment, if Figure 1 and Figure 2 As shown, there are two expansion parts 20 , which are respectively arranged at opposite ends of the rotating plate 32 . Correspondingly, there are also two mounting grooves 11 , and the two expansion parts 20 are respectively arranged corresponding to the two mounting grooves 11 .

[0063] Two expansion parts 20 are provided and are respectively arranged at opposite ends of the rotating plate 32, so that the two expansion parts 20 are located on opposite sides of the syringe 10, respectively, so that the expansion parts 20 support the battery cell at a symmetrical position, so that the winding shape of the battery cell is more regular and the winding process is more stable.

[0064] In this embodiment, if Figure 2 As shown, the outer side of the expansion portion 20 is arc-shaped. Figure 8 When the expansion part 20 is in the supporting position, the outer side of the expansion part 20 cooperates with the outer wall of the syringe 10 to form an approximately complete circular structure, so as to facilitate stable and uniform winding of the battery core; please refer to Figure 2 When the expansion portion 20 is in the retracted position, the overall external dimensions of the winding needle become smaller, thereby forming a gap between the interior of the battery cell and the exterior of the winding needle, making it easier for the battery cell to detach from the winding needle.

[0065] Of course, as an alternative embodiment, the support position of the expansion portion 20 is relative to Figure 8 The expansion portion 20 can be further outward.

[0066] like Figure 1 As shown, two rotating plates 32 are spaced apart on a rotating rod 31 , and correspondingly, two connecting posts 22 are spaced apart on a tightening block 21 , and a plug 221 is provided on each connecting post 22 .

[0067] like Figures 2 to 4 As shown, a placement groove 12 is formed on the wall of the syringe 10, which allows the end of the diaphragm 90 to penetrate. The diaphragm fixing structure includes a pressing portion 50, one end of which is connected to the inertial holding structure 30, and the other end of the pressing portion 50 is arranged near the inner wall of the syringe 10, so that the diaphragm 90 can be fixed between the other end of the pressing portion 50 and the inner wall of the syringe 10.

[0068] The pressing portion 50 is connected to the inertial holding structure 30. When the needle cylinder 10 and the inertial holding structure 30 rotate relative to each other, the expansion portion 20 moves to the supporting position, the pressing portion 50 also rotates relative to the needle cylinder 10, and the diaphragm 90 is fixed between the pressing portion 50 and the inner wall of the needle cylinder 10, and winding can be carried out. After winding is completed, the needle cylinder 10 rotates relative to the inertial holding structure 30 in the opposite direction, the expansion portion 20 moves to the retracted position, and the pressing portion 50 stops pressing on the diaphragm 90, so that the battery cell can be removed from the winding needle. Therefore, by arranging the pressing portion 50 on the inertial holding structure 30, the expansion portion 20 and the pressing portion 50 can be synchronized, so that the expansion portion 20 and the pressing portion 50 can work together, simplifying the structure of the winding needle and the working steps.

[0069] Specifically, in this embodiment, Figure 4 As shown, the pressing portion 50 includes a mounting plate 51, a connecting plate 52, and a pressing strip 53. The mounting plates 51 are connected to the inertial holding structure 30, and a plurality of mounting plates 51 are arranged at intervals. The connecting plate 52 connects a plurality of mounting plates 51 at the same time. The pressing strip 53 is arranged on the side of the connecting plate 52 away from the mounting plate 51.

[0070] Several mounting plates 51 are arranged at intervals, which ensures the stability of the pressing process while ensuring a simple structure and light weight.

[0071] In this embodiment, if Figure 2 and Figure 4 As shown, the inner end of the mounting plate 51 is connected to the rotating rod 31, and the pressing strip 53 is provided on one side of the connecting plate 52. Figure 7 and Figure 8 The end of the diaphragm 90 is inserted into the interior of the syringe 10 through the placement groove 12, and the end of the diaphragm 90 is fixed between the inner wall of the syringe 10 and the inner wall of the syringe 10 on the side of the pressing strip 53 facing the inner wall of the syringe 10.

[0072] Of course, the pressing portion 50 may also extend into the interior of the placement groove 12 , and the diaphragm 90 may be pressed against the groove wall of the placement groove 12 by the pressing portion 50 .

[0073] It is worth noting that in other alternative embodiments, the diaphragm fixing structure can also be other structures that can fix and release the diaphragm 90. For example, it can be a clamping structure arranged inside the syringe 10. During winding, the clamping structure clamps and fixes the end of the diaphragm 90, and releases the diaphragm 90 after the winding is completed.

[0074] like Figure 1 As shown, the retaining structure 40 includes two ball plungers, the fixed ends of which are connected to the inner wall of the syringe 10 and arranged side by side along the axial direction of the syringe 10. The rotating rod 31 is provided with two retaining grooves 34, which are staggered along the axial and circumferential directions of the rotating rod 31. When the expansion unit 20 is in the retracted position, the ball head of one ball plunger is inserted into one of the retaining grooves 34; when the expansion unit 20 is in the supporting position, the ball head of the other ball plunger is inserted into the other retaining groove 34.

[0075] It is worth noting that the ball head of the ball plunger can be extended or retracted under the action of the spring, see Figure 1 The ball head of the ball plunger on the left side extends out and is inserted into the corresponding limiting groove 34. The ball head of the ball plunger on the right side retracts under the action of the outer wall of the rotating rod 31 and is staggered in the circumferential direction with the corresponding limiting groove 34.

[0076] Of course, in other alternative embodiments, one ball plunger may be provided, and two limiting grooves 34 may be provided, with the two limiting grooves 34 being spaced apart along the circumference of the rotating rod 31. When the expansion portion 20 is in the retracted position, the ball plunger is inserted into one of the limiting grooves 34; when the expansion portion 20 is in the supporting position, the syringe 10 drives the ball plunger to rotate circumferentially by a certain angle, so that the ball plunger is inserted into the other limiting groove 34.

[0077] It should be noted that the number of the ball plunger and the limiting groove 34 can also be set to be greater, as long as the ball plunger and the limiting groove 34 can be matched with the two positions of the expansion part 20 accordingly.

[0078] The cooperation between the ball plunger and the limiting groove 34 is used to fix the relative position of the syringe 10 and the inertial holding structure 30. Moreover, when the syringe 10 accelerates and rotates instantaneously, the ball plunger can be disengaged from the limiting groove 34 under the action of the rotational force of the syringe 10, thereby facilitating the change of the relative position of the syringe 10 and the inertial holding structure 30.

[0079] like Figure 2 As shown, a cutting groove 13 is provided on the outer wall of the syringe 10 to prevent the cutter 81 from interfering with the syringe 10 when cutting the diaphragm 90, thereby ensuring the integrity of the syringe 10 and the cutter 81 and the safety of the cutting process.

[0080] like Figure 2 As shown, the outer side of the expansion block 21 is recessed inward to form a receiving groove 23. When the winding is completed and the battery core is removed from the winding needle, the battery core clamping rod can be inserted into the receiving groove 23 to facilitate the removal of the battery core.

[0081] Example 2

[0082] like Figures 5 to 9 A specific embodiment of the winding device shown includes the winding needle in Example 1.

[0083] like Figures 5 to 9 As shown, the winding device further includes a film pressing mechanism 60, a film pushing mechanism 70, and a film cutting mechanism 80. The film pressing mechanism 60 is used to press the diaphragm 90 against the outer wall of the syringe 10, the film pushing mechanism 70 can push the end of the diaphragm 90 from the placement groove 12 into the syringe 10, and the film cutting mechanism 80 is used to cut the diaphragm 90 on the side of the film pushing mechanism 70 away from the film pressing mechanism 60.

[0084] It is worth noting that after the film pressing mechanism 60 presses the diaphragm 90 onto the outer wall of the syringe 10 , the film cutting mechanism 80 cuts the diaphragm 90 to form an end portion of the diaphragm 90 , and the film pushing mechanism 70 pushes the end portion of the diaphragm 90 into the placement groove 12 .

[0085] In this embodiment, if Figures 5 to 9 As shown, the film pressing mechanism 60 includes a one-way wheel 61 and a first driving part 62, and the first driving part 62 can drive the one-way wheel 61 to move closer to or away from the syringe 10; the film pushing mechanism 70 includes a push plate 71 and a second driving part 72, and the second driving part 72 can drive the push plate 71 to insert into or move out of the placement slot 12; the film cutting mechanism 80 includes a cutter 81 and a third driving part 82, and the third driving part 82 can drive the cutter 81 to move closer to or away from the syringe 10.

[0086] It is worth noting that in this embodiment, the diaphragm 90 is pressed against the outer wall of the syringe 10 using the one-way wheel 61 because after the film-pushing mechanism 70 pushes the end of the diaphragm 90 into the syringe 10 and then withdraws it from the syringe 10, the one-way wheel 61 needs to continue pressing the diaphragm 90. Only when the syringe 10 rotates a certain angle relative to the pressing portion 50, so that the pressing portion 50 presses the end of the diaphragm 90 against the inner wall of the syringe 10, can the one-way wheel 61 stop pressing the diaphragm 90. Therefore, relative rotation occurs between the outer wall of the syringe 10 and the film-pushing mechanism 60. If the diaphragm 90 is pressed using a pressing plate, it will cause scratches on the diaphragm 90.

[0087] For further explanation, please refer to Figure 7 and Figure 8, the needle cylinder 10 rotates clockwise, and accordingly, the rotation direction of the one-way wheel 61 is counterclockwise. If the one-way wheel 61 can rotate in the clockwise direction, under the tension of the diaphragm 90, the one-way wheel 61 cannot stably press the diaphragm 90.

[0088] In this embodiment, the winding device further includes a fourth drive unit, which is in transmission connection with the film pressing mechanism 60, the film pushing mechanism 70, and the film cutting mechanism 80. The fourth drive unit can simultaneously drive the film pressing mechanism 60, the film pushing mechanism 70, and the film cutting mechanism 80 toward or away from the winding needle. Specifically, the fourth drive unit is connected to the first drive unit 62, the second drive unit 72, and the third drive unit 82.

[0089] In this embodiment, the first driving part 62 , the second driving part 72 , the third driving part 82 and the fourth driving part may be pneumatic cylinders, electric cylinders and the like.

[0090] Example 3

[0091] This embodiment provides a specific implementation of a winding machine, including the winding device of Example 2, so that the winding machine has a strong rigidity and a simple structure.

[0092] When using the winding device of Example 2, first, Figure 5 As shown, the fourth driving unit drives the film pressing mechanism 60, the film pushing mechanism 70 and the film cutting mechanism 80 to approach the winding needle, and the first driving unit 62 drives the one-way wheel 61 to press the diaphragm 90 onto the outer wall of the syringe 10, and the third driving unit 82 drives the cutter 81 to cut the diaphragm 90; then, as shown in FIG. Figure 6 and Figure 7 As shown, the second driving part 72 drives the push plate 71 to push the end of the diaphragm 90 into the placement groove 12, and then the end of the diaphragm 90 extends into the syringe 10; thereafter, as shown Figure 8 As shown, the one-way wheel 61 continuously presses the diaphragm 90, the second driving part 72 drives the push plate 71 to withdraw from the placement groove 12, and the syringe 10 instantly accelerates to rotate, so that the pressing part 50 presses the end of the diaphragm 90 on the inner wall of the syringe 10, and under the action of the sliding groove 321, the expansion part 20 moves from the retracted position to the supporting position; finally, as shown Figure 9As shown, the first drive unit 62 drives the one-way wheel 61 away from the winding needle, the second drive unit 72 drives the push plate 71 away from the winding needle, the third drive unit 82 drives the cutter 81 away from the winding needle, and the fourth drive unit simultaneously drives the film pressing mechanism 60, the film pushing mechanism 70, and the film cutting mechanism 80 away from the winding needle, allowing the winding needle to rotate and begin winding. When winding is completed, the needle cylinder 10 instantly accelerates and rotates in the opposite direction. The push surface of the slide groove 321 moves the expansion unit 20 from the support position to the retracted position, and simultaneously releases the pressure of the pressing unit 50 on the diaphragm 90. At this point, the battery cell clamping rod can be inserted into the receiving groove 23, and the battery cell can be removed from the winding needle using the battery cell clamping rod.

[0093] According to the above description, this patent application has the following advantages:

[0094] 1. The winding needle has an almost complete cylindrical structure in the circumferential direction, which ensures the overall rigidity of the winding needle. The winding needle does not require additional support when in use, thus simplifying the overall structure of the winding device.

[0095] 2. The syringe is instantly accelerated by the rotation drive structure of the syringe, while the inertia holding structure can remain stationary by its own inertia force, so that the syringe can be rotated around the inertia holding structure by a certain angle. Therefore, no additional drive is required to achieve relative rotation between the syringe and the inertia holding structure, simplifying the overall structure.

[0096] 3. The winding needle is integrated to improve the processing accuracy.

[0097] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A needle coil, characterized in that: include: A syringe (10), wherein a mounting groove (11) is provided on the wall of the syringe (10); an expansion portion (20) movably disposed in the mounting groove (11), the expansion portion (20) having a retracted position located inside the mounting groove (11) and a supporting position at least partially located outside the mounting groove (11); a diaphragm fixing structure adapted to cooperate with the syringe (10) to fix or release the diaphragm (90); An inertia holding structure (30) is inserted into the needle cylinder (10) and movably connected to the expansion part (20), and the needle cylinder (10) can rotate relative to the inertia holding structure (30) and drive the expansion part (20) to rotate, and under the action of the inertia holding structure (30), the expansion part (20) is switched between the retracted position and the supporting position; A limiting structure (40) is provided between the syringe (10) and the inertia holding structure (30), and the limiting structure (40) is suitable for fixing the relative position of the syringe (10) and the inertia holding structure (30).

2. The winding needle according to claim 1, characterized in that The inertial holding structure (30) comprises: A rotating rod (31) is inserted into the needle cylinder (10), and the needle cylinder (10) can rotate around the rotating rod (31); A rotating plate (32) is connected to the rotating rod (31), and a sliding groove (321) is provided on the rotating plate (32). The expansion part (20) is slidably connected to the sliding groove (321). The inner wall of the sliding groove (321) is a pushing surface. When the syringe (10) rotates around the rotating rod (31), the pushing surface can push the expansion part (20) to move in the installation groove (11); The inertia enhancing portion (33) is arranged on the rotating rod (31).

3. The winding needle according to claim 2, characterized in that The expansion portion (20) includes an expansion block (21) and a connecting column (22), wherein the expansion block (21) is slidably connected to the inner wall of the mounting groove (11), and the connecting column (22) is arranged on the inner side of the expansion block (21). A plug (221) is provided on the connecting column (22), and the plug (221) is inserted into the sliding groove (321) and is slidably connected to the pushing surface.

4. The winding needle according to claim 2, characterized in that The sliding groove (321) is a waist-shaped groove or a waist-shaped hole.

5. The winding needle according to any one of claims 2 to 4, characterized in that: There are two expansion parts (20) and two mounting grooves (11). The two expansion parts (20) are respectively arranged at opposite ends of the rotating plate (32) and correspond to the two mounting grooves (11).

6. The winding needle according to any one of claims 1 to 4, characterized in that: The wall of the syringe (10) is also provided with a placement groove (12), and the placement groove (12) can allow the end of the diaphragm (90) to penetrate; the diaphragm fixing structure includes a pressing part (50), one end of the pressing part (50) is connected to the inertia holding structure (30), and the other end of the pressing part (50) is arranged close to the inner wall of the syringe (10), and the other end of the pressing part (50) and the inner wall of the syringe (10) are suitable for fixing the diaphragm (90).

7. The winding needle according to claim 6, characterized in that The pressing portion (50) includes a mounting plate (51), a connecting plate (52) and a pressing strip (53); the mounting plate (51) is connected to the inertia holding structure (30), and a plurality of mounting plates (51) are arranged at intervals; the connecting plate (52) simultaneously connects a plurality of mounting plates (51); and the pressing strip (53) is arranged on a side of the connecting plate (52) away from the mounting plate (51).

8. The winding needle according to any one of claims 1 to 4, characterized in that: The limiting structure (40) includes at least one ball plunger, the fixed end of which is connected to the inner wall of the syringe (10), and at least two limiting grooves (34) are provided on the inertial holding structure (30). When the expansion part (20) is in the retracted position, the ball head of at least one ball plunger is suitable for being inserted into one of the limiting grooves (34); when the expansion part (20) is in the supporting position, the ball head of at least one ball plunger is suitable for being inserted into the other limiting groove (34).

9. The winding needle according to claim 8, characterized in that There are two ball plungers, which are arranged side by side along the axial direction of the syringe (10); there are two limiting grooves (34), which are staggered along the axial and circumferential directions of the inertia retaining structure (30); when the expansion part (20) is in the retracted position, the ball head of one ball plunger is suitable for being inserted into one of the limiting grooves (34); when the expansion part (20) is in the supporting position, the ball head of the other ball plunger is suitable for being inserted into the other limiting groove (34).

10. The winding needle according to any one of claims 1 to 4, characterized in that: A cutting groove (13) is provided on the outer wall of the needle cylinder (10).

11. The winding needle according to any one of claims 1 to 4, characterized in that: The outer side of the expansion portion (20) is recessed inward to form a receiving groove (23).

12. A winding device, characterized in that: The invention comprises the winding needle according to any one of claims 1 to 11.

13. The winding device according to claim 12, characterized in that The winding device also includes: a film pressing mechanism (60), the film pressing mechanism (60) being adapted to press the diaphragm (90) onto the outer wall of the syringe (10); A film pushing mechanism (70), wherein the film pushing mechanism (70) is adapted to push the end of the diaphragm (90) into the syringe (10) through the placement groove (12) provided on the syringe (10); A film cutting mechanism (80) is adapted to cut the diaphragm (90) on the side of the film pushing mechanism (70) away from the film pressing mechanism (60).

14. The winding device according to claim 13, characterized in that The film pressing mechanism (60) comprises a one-way wheel (61) and a first driving portion (62), wherein the first driving portion (62) is adapted to drive the one-way wheel (61) to move closer to or away from the needle cylinder (10); and / or, The film pushing mechanism (70) comprises a pushing plate (71) and a second driving portion (72), wherein the second driving portion (72) is adapted to drive the pushing plate (71) to be inserted into or removed from the placement slot (12); and / or, The film cutting mechanism (80) comprises a cutter (81) and a third driving part (82), and the third driving part (82) is suitable for driving the cutter (81) to approach or move away from the syringe (10).

15. The winding device according to claim 14, characterized in that The winding device also includes a fourth driving unit, which is in transmission connection with the film pressing mechanism (60), the film pushing mechanism (70) and the film cutting mechanism (80). The fourth driving unit is suitable for driving the film pressing mechanism (60), the film pushing mechanism (70) and the film cutting mechanism (80) to approach or move away from the winding needle at the same time.

16. A winding machine, characterized in that: The invention comprises the winding device according to any one of claims 12 to 15.

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