Winding needle, winding device and 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; a push part, movably inserted in the syringe, the push part and the expansion part are transmission-connected to drive the expansion part to switch between the retracted position and the support position; a locking structure, arranged between the push part and the syringe, when the expansion part is in the retracted position, the locking structure is in a first locking position on the push part, and when the expansion part is in the support position, the locking structure is in a second locking position on the push part. The winding needle provided by the present invention has 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 require additional support when in use, thereby simplifying 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 When the needle needs to be withdrawn, the diameter of the two outer needle halves is reduced, and the two inner needle halves loosen the diaphragm, and the battery cell can be removed from the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 fixing or loosening the diaphragm; a pushing part, movably inserted into the needle cylinder, the pushing part is transmission-connected to the expansion part to drive the expansion part to switch between the retracted position and the support position; a locking structure, arranged between the pushing part and the needle cylinder, when the expansion part is in the retracted position, the locking structure is in a first locking position on the pushing part, and when the expansion part is in the support position, the locking structure is in a second locking position on the pushing part.

[0006] Optionally, the locking structure includes a locking rod and an elastic member, a guide groove is provided on the pushing portion, the first locking position and the second locking position are located on the guide groove, one end of the locking rod is rotatably connected to the syringe, and the other end of the locking rod is inserted into the guide groove and can move along the guide groove between the first locking position and the second locking position, the elastic member is arranged between the pushing portion and the syringe, and the elastic member is suitable for applying an elastic force to the pushing portion that is opposite to the pushing direction of the pushing portion.

[0007] Optionally, the guide groove is a circumferentially continuous annular groove body, the first side of the inner ring groove wall of the guide groove is recessed inward to form a first limiting portion, the first side of the outer ring groove wall of the guide groove is recessed inward to form a first tip, the second side of the outer ring groove wall of the guide groove protrudes outward to form a second limiting portion, and the second side of the inner ring groove wall of the guide groove protrudes outward to form a second tip, the first locking position corresponds to the first limiting portion, and the second locking position corresponds to the second limiting portion, and a first path and a second path are formed in the guide groove, and under the restriction of the first tip, the locking rod is suitable for moving from the first limiting portion to the second limiting portion along the first path, and under the restriction of the second tip and the first tip, the locking rod is suitable for moving from the second limiting portion to the first limiting portion along the second path.

[0008] Optionally, the locking rod includes a first plug-in rod, a second plug-in rod and a connecting rod, the first plug-in rod passes through the pushing portion and is rotatably connected to the inner wall of the syringe, the second plug-in rod is inserted in the guide groove, the connecting rod connects the first plug-in rod and the second plug-in rod, and the pushing portion is provided with a sliding groove suitable for accommodating the first plug-in rod and allowing the first plug-in rod to move relative to each other.

[0009] Optionally, the winding needle further includes a transmission rod, one end of the transmission rod is hinged to the expansion part, and the other end of the transmission rod is hinged to the pushing part.

[0010] Optionally, two expansion parts are provided, and two mounting grooves are also provided. The two mounting grooves are arranged opposite to each other on the syringe, and the two expansion parts are respectively provided corresponding to the two mounting grooves.

[0011] Optionally, a placement groove is provided on the wall of the syringe, and the placement groove is suitable for inserting the end of the diaphragm; the diaphragm fixing structure includes an adsorption part, and there are at least two adsorption parts, and at least two of the adsorption parts are provided on both sides of the placement groove, and the adsorption part is suitable for adsorbing and fixing the corresponding diaphragm.

[0012] Optionally, the winding needle further includes a guide block, which is disposed inside the needle cylinder and connected to the inner wall of the needle cylinder, and the pushing portion is inserted into the guide block and slidably connected to the guide block.

[0013] Optionally, a cutting groove is provided on the outer wall of the syringe.

[0014] Optionally, the outer side of the expansion portion is recessed inward to form a receiving groove.

[0015] Optionally, the winding needle further includes a first driving portion, and the first driving portion is suitable for pushing the pushing portion to move.

[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 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 pressing plate and a second driving part, the second driving part is suitable for driving the pressing plate to approach or move away from the syringe; and / or, the film pushing mechanism includes a pushing plate and a third driving part, the third driving part is suitable for driving the pushing plate to insert into or move out of the placement slot; and / or, the film cutting mechanism includes a cutter and a fourth driving part, the fourth driving part is suitable for driving the cutter to approach or move away from the syringe.

[0019] Optionally, the push plate is a comb-tooth structure.

[0020] Optionally, the winding device further includes a fifth driving 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.

[0021] The present invention also provides a winding machine comprising the above-mentioned winding device.

[0022] The present invention has the following advantages:

[0023] 1. The present invention provides a winding needle, which drives the expansion part to switch between the retracted position and the support position during the process of driving the push part to move, and fixes the push part in the first locking position or the second locking position by setting a locking structure, so that the expansion part is fixed in the retracted position or the support position. That is, when winding is required, the locking structure is moved from the first locking position to the second locking position by driving the push part, so that the expansion part is moved and fixed in the support position to support the interior of the battery cell. After the winding is completed, the locking structure is moved from the second locking position to the first locking position by driving the push part, so that the expansion part is moved and fixed in the retracted position, so that a gap is generated between the interior of the battery cell and the exterior of the needle barrel, which facilitates the removal of the battery cell from the needle barrel. Therefore, the winding needle has 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 require additional support when in use, which simplifies the overall structure of the winding device.

[0024] 2. The present invention provides a winding needle, which allows the locking rod to slide in the guide groove during the movement of the pushing part, and utilizes the elasticity of the elastic part to increase the force between the groove wall of the guide groove and the locking rod, so that the locking rod is stably located in the first locking position and the second locking position on the guide groove.

[0025] 3. The present invention provides a winding needle, which can ensure the stability of the restriction on the locking rod by arranging a first limiting portion and a second limiting portion in the guide groove; by arranging a first tip and a second tip, when the locking rod contacts the first tip or the second tip, the first tip or the second tip guides the movement of the locking rod, so that the locking rod can move more smoothly and more standardizedly between the first limiting portion and the second limiting portion.

[0026] 4. The winding needle provided by the present invention is provided with a transmission rod to drive the expansion part to move synchronously when the pushing part moves. It has a simple structure and is easy to drive.

[0027] 5. The present invention provides a winding needle, which is provided with two expansion parts, and the two expansion parts are respectively located on opposite sides of the needle cylinder, so that the expansion parts are supported at 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.

[0028] 6. The present invention provides a winding needle that uses an adsorption portion to adsorb and fix the end of the diaphragm. Moreover, because the diaphragm is provided with two layers when the battery cell is wound, two adsorption portions are provided to fix the two layers of diaphragm respectively, and the fixing method is simple and convenient.

[0029] 7. The winding needle provided by the present invention limits and guides the movement of the pushing part by setting a guide block, thereby ensuring the accuracy and stability of the movement of the pushing part.

[0030] 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.

[0031] 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

[0032] 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.

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

[0034] Figure 2 1 shows a cross-sectional view of a winding needle provided by embodiment 1 of the present invention along the axial direction;

[0035] Figure 3 for Figure 2 Partial cross-sectional view of AA;

[0036] Figure 4 It shows a structural schematic diagram of the embodiment 1 of the present invention when the expansion part is in the retracted position and the locking structure is in the first locking position;

[0037] Figure 5 It shows a structural schematic diagram of the embodiment 1 of the present invention when the expansion portion is located in the supporting position and the locking structure is located in the second locking position;

[0038] Figure 6 A schematic structural diagram of a guide groove and a slide groove provided in Example 1 of the present invention is shown;

[0039] Figure 7 A schematic diagram of the connection structure of the expansion part, the transmission rod and the pushing part provided in Example 1 of the present invention is shown;

[0040] Figure 8 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the invention in a first state;

[0041] Figure 9 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the invention in the second state;

[0042] Figure 10 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the invention in the third state;

[0043] Figure 11 FIG2 shows a schematic structural diagram of the winding device provided in Example 2 of the invention in the fourth state;

[0044] Figure 12 A schematic structural diagram of a push plate provided in embodiment 2 of the present invention is shown.

[0045] Description of reference numerals:

[0046] 10. Syringe; 11. Mounting slot; 12. Placement slot; 13. Cutter slot; 14. Cylinder; 15. Base; 16. Cover; 17. Support; 20. Expansion; 21. Expansion block; 22. Connecting column; 23. Accommodation slot; 30. Pushing portion; 31. Guide slot; 311. First limiting portion; 312. First tip; 313. Second limiting portion; 314. Second tip; 315. First path; 316. Second path; 32. Slide; 40. Locking structure; 41. Locking lever; 411 , first plug-in rod; 412, second plug-in rod; 413, connecting rod; 42, elastic member; 50, transmission rod; 51, pin shaft; 52, spacer; 60, adsorption part; 61, air nozzle; 62, air chamber; 63, air hole; 70, guide block; 80, first driving part; 90, film pressing mechanism; 91, pressing plate; 92, second driving part; 100, film pushing mechanism; 101, pushing plate; 102, third driving part; 110, film cutting mechanism; 111, cutter; 112, fourth driving part; 120, diaphragm. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Example 1

[0052] like Figures 1 to 7 A specific embodiment of the winding needle shown includes: a syringe 10, an expansion part 20, a diaphragm fixing structure, a pushing part 30 and a locking structure 40. A mounting groove 11 is provided on the wall of the syringe 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 supporting position at least partially located outside the mounting groove 11. The diaphragm fixing structure is used to fix the diaphragm 120 during winding and to release the diaphragm 120 after the winding is completed. The pushing part 30 is inserted into the syringe 10 and can move along the axial direction of the syringe 10. The locking structure 40 is arranged between the pushing part 30 and the syringe 10, and the locking structure 40 has a first locking position and a second locking position on the pushing part 30. The pushing part 30 is transmission-connected to the expansion part 20. During the movement of the pushing part 30, it can drive the expansion part 20 to switch between the retracted position and the supporting position. Moreover, when the expansion part 20 is in the retracted position, the locking structure 40 is in the first locking position. When the expansion part 20 is in the supporting position, the locking structure 40 is in the second locking position.

[0053] During the process of driving the pusher 30 to move axially along the needle cylinder 10, the expansion portion 20 is driven to switch between the retracted position and the support position. Furthermore, the pusher 30 is fixed in the first or second locking position by providing a locking structure 40, thereby fixing the expansion portion 20 in the retracted position or the support position. That is, when winding is required, the pusher 30 is driven to move the locking structure 40 from the first locking position to the second locking position, thereby moving the expansion portion 20 to the support position and fixing it to support the interior of the battery cell. After winding is completed, the pusher 30 is driven to move the locking structure 40 from the second locking position to the first locking position, thereby moving the expansion portion 20 to the retracted position and fixing it to create a gap between the interior of the battery cell and the exterior of the needle cylinder 10, thereby facilitating the removal of the battery cell from the needle cylinder 10. Therefore, the winding needle has 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 ensured. The winding needle does not require additional support during use, thereby simplifying the overall structure of the winding device.

[0054] like Figures 2 to 5As shown, the locking structure 40 includes a locking rod 41 and an elastic member 42. The push portion 30 is provided with a guide groove 31, and the first locking position and the second locking position are both located on the guide groove 31. One end of the locking rod 41 is rotatably connected to the syringe 10, and the other end of the locking rod 41 is inserted into the guide groove 31 and can move along the guide groove 31 between the first locking position and the second locking position. The elastic member 42 is disposed between the push portion 30 and the syringe 10 and can apply an elastic force to the push portion 30 in the opposite direction of the push direction of the push portion 30.

[0055] During the movement of the pushing portion 30, the locking rod 41 slides in the guide groove 31, and the elasticity of the elastic member 42 is used to increase the force between the groove wall of the guide groove 31 and the locking rod 41, so that the locking rod 41 is stably located in the first locking position and the second locking position on the guide groove 31.

[0056] Specifically, in this embodiment, Figure 6 As shown, the guide groove 31 is an annular groove body that penetrates the circumference. Therefore, the guide groove 31 on the pushing portion 30 is formed with an inner groove wall and an outer groove wall. Figure 6 As shown, the first side of the inner groove wall is recessed inward to form a first stopper 311, the first side of the outer groove wall is recessed inward to form a first tip 312, the second side of the outer groove wall protrudes outward to form a second stopper 313, and the second side of the inner groove wall protrudes outward to form a second tip 314. The first locking position corresponds to the first stopper 311, and the second locking position corresponds to the second stopper 313. A first path 315 and a second path 316 are interconnected within the guide groove 31. Under the restraint of the first tip 312, the locking rod 41 moves from the first stopper 311 to the second stopper 313 via the first path 315. Under the restraint of the second tip 314 and the first tip 312, the locking rod 41 moves from the second stopper 313 to the first stopper 311 via the second path 316.

[0057] It is worth noting that, please refer to Figure 6 , the first side mentioned above is Figure 6 The right side shown, the second side mentioned above is Figure 6 The "inside" and "outside" mentioned above in "inwardly concave" and "outwardly convex" are relative to the center position of the annular groove body. The direction toward the center position is inward, and the direction away from the center position is outward. In this embodiment, please refer to Figure 6 The first path 315 refers to the groove body that connects the first limiting portion 311 and the second limiting portion 313 and is located in the upper half, and the second path 316 refers to the groove body that connects the first limiting portion 311 and the second limiting portion 313 and is located in the lower half.

[0058] By arranging the first limiting portion 311 and the second limiting portion 313 in the guide groove 31, the stability of the restriction on the locking rod 41 can be ensured; by arranging the first tip 312 and the second tip 314, when the locking rod 41 contacts the first tip 312 or the second tip 314, the movement of the locking rod 41 is guided by the first tip 312 or the second tip 314, so that the locking rod 41 can move more smoothly and more standardizedly between the first limiting portion 311 and the second limiting portion 313.

[0059] In this embodiment, if Figure 3 As shown, the locking rod 41 includes a first connecting rod 411, a second connecting rod 412, and a connecting rod 413. The first connecting rod 411 extends through the push portion 30 and is rotatably connected to the inner wall of the syringe 10. The second connecting rod 412 is inserted into the guide groove 31. The connecting rod 413 is connected between the first connecting rod 411 and the second connecting rod 412. The push portion 30 defines a slide groove 32, in which the first connecting rod 411 is located. During movement of the push portion 30, the first connecting rod 411 is able to move relative to the slide groove 32.

[0060] Understandably, see Figure 3 The above-mentioned first plug-in rod 411 can move relatively in the slide groove 32, which means that the first plug-in rod 411 does not move in position (the first plug-in rod 411 can rotate in place, but will not move), and the slide groove 32 will move left and right synchronously with the left and right movement of the pushing part 30. Therefore, the first plug-in rod 411 moves relatively in the slide groove 32.

[0061] It is worth noting that, please refer to Figure 3 The lower end of the first connecting rod 411 is rotatably inserted on the inner wall of the syringe 10, the middle part of the first connecting rod 411 is located in the slide groove 32, the second connecting rod 412 is inserted in the guide groove 31, and the connecting rod 413 connects the upper end of the first connecting rod 411 and the upper end of the second connecting rod 412.

[0062] For further explanation, please refer to Figures 4 to 6When the locking rod 41 moves from the first limiting portion 311 to the second limiting portion 313, the pushing portion 30 is driven leftward, and the outer wall of the second plugging rod 412 abuts against the first tip 312. The first tip 312 can push the second plugging rod 412 to move upward, that is, push the locking rod 41 to rotate upward, so that the second plugging rod 412 enters the first path 315 and moves to the second limiting portion 313 through the first path 315; when the locking rod 41 moves from the second limiting portion 313 to the first limiting portion When the second plug rod 412 moves to the first tip 312 through the second path 316, the second plug rod 412 moves to the first limit portion 311 under the restriction of the first tip 312.

[0063] It is worth noting that in this embodiment, regardless of whether the second connecting rod 412 is located at the first limiting portion 311 or the second limiting portion 313, the elastic member 42 is in a compressed state, thereby applying a rightward elastic force to the pushing portion 30, so that the second connecting rod 412 is stably engaged with the first limiting portion 311 or the second limiting portion 313. That is, in this embodiment, the pushing direction of the pushing portion 30 is to the left, and the elastic force of the elastic member 42 is to the right.

[0064] In this embodiment, the elastic member 42 is a spring.

[0065] like Figure 2 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 both ends of the barrel 14, and the pusher 30 is inserted into the seat 15 and the cover 16. In this embodiment, the elastic member 42 is arranged between the seat 15 and the pusher 30.

[0066] Of course, as an alternative embodiment, the elastic member 42 may also be provided between the cover 16 and the pushing portion 30 , and the elastic member 42 may be in a stretched state to apply a rightward pulling force to the pushing portion 30 .

[0067] In this embodiment, if Figure 2 As shown, the winding needle further includes a first driving portion 80, which can push the pushing portion 30 to move. Specifically, as Figure 2 As shown, the first driving portion 80 is a cylinder, which is disposed on the right side of the pushing portion 30 and can push the pushing portion 30 to the left.

[0068] Of course, the locking structure 40 may also be other structures capable of fixing the pushing portion 30 at the first locking position and the second locking position, for example, it may be a press locking mechanism similar to that of an automatic ballpoint pen.

[0069] like Figure 4 、 Figure 5 and Figure 7 As shown, a transmission rod 50 is provided between the expansion part 20 and the pushing part 30. One end of the transmission rod 50 is hinged to the expansion part 20, and the other end of the transmission rod 50 is hinged to the pushing part 30. By providing the transmission rod 50, the expansion part 20 is driven to move synchronously when the pushing part 30 moves, which has a simple structure and is easy to drive.

[0070] Specifically, such as Figure 7 As shown, the expansion portion 20 includes an expansion block 21 and a connecting column 22. The expansion block 21 is slidably connected to the inner wall of the mounting groove 11, and the connecting column 22 is disposed inside the expansion block 21. One end of the transmission rod 50 is hinged to the connecting column 22 via a pin 51.

[0071] like Figures 1 to 7 As shown, there are two expansion parts 20 and two mounting slots 11. The two mounting slots 11 are arranged opposite each other on the syringe 10, and the two expansion parts 20 are respectively arranged corresponding to the two mounting slots 11. Therefore, the expansion parts 20 can support the battery cell at symmetrical positions, making the winding shape of the battery cell more regular and the winding process more stable.

[0072] In this embodiment, if Figure 7 As shown, the other ends of the two transmission rods 50 correspondingly provided on the two expansion parts 20 are hinged to the same position of the pushing part 30 through a pin shaft 51 , and a spacer 52 is provided between the transmission rod 50 and the pushing part 30 .

[0073] In this embodiment, if Figure 2 As shown, two connecting columns 22 are spaced apart on each expansion block 21 , and each connecting column 22 is correspondingly provided with a transmission rod 50 .

[0074] In this embodiment, if Figure 1 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 1 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.

[0075] 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.

[0076] like Figure 1As shown, a placement groove 12 is formed on the wall of the syringe 10, into which the end of the septum 120 is inserted. The septum fixing structure includes two adsorption portions 60, which are provided on both sides of the placement groove 12 and can adsorb and fix the corresponding septum 120.

[0077] The end of the separator 120 is adsorbed and fixed by the adsorption portion 60. Moreover, since the separator 120 is provided with two layers when the battery cell is wound, two adsorption portions 60 are provided to fix the two layers of the separator 120 respectively, and the fixing method is simple and convenient.

[0078] Specifically, in this embodiment, Figure 1 As shown, the suction portion 60 includes an air nozzle 61, an air chamber 62, and an air hole 63. The air nozzle 61 allows air to be drawn from or introduced into the air chamber 62. The air hole 63 is located on the side of the suction portion 60 facing the placement slot 12, and connects the air chamber 62 with the placement slot 12. To secure the diaphragm 120 by suction, the air nozzle 61 is used to evacuate the air chamber 62, allowing the air hole 63 to hold the diaphragm 120. To release the diaphragm 120 after winding, atmospheric pressure or a pressure greater than atmospheric pressure is introduced into the air chamber 62 through the air nozzle 61 to release the suction of the diaphragm 120.

[0079] Of course, the number and location of the adsorption parts 60 can be set according to specific usage conditions, as long as it is ensured that both layers of diaphragms 120 can be adsorbed and fixed.

[0080] It is worth noting that, in other alternative embodiments, the diaphragm fixing structure may also be other structures capable of fixing and releasing the diaphragm 120. For example, it may be a clamping structure disposed inside the syringe 10, which clamps and fixes the end of the diaphragm 120 during winding and releases the diaphragm 120 after winding is completed; or it may be a pressing structure that presses the end of the diaphragm 120 onto the syringe 10.

[0081] like Figure 1 and Figure 3 As shown, one side of the inner wall of the syringe 10 protrudes into the syringe 10 to form a support portion 17 , and the first connecting rod 411 is rotatably connected to the support portion 17 .

[0082] In this embodiment, if Figure 1 and Figure 2 As shown, the winding needle further includes a guide block 70, which is disposed inside the needle cylinder 10 and connected to the support portion 17. The pusher 30 is inserted into the guide block 70 and slidably connected to the guide block 70. The guide block 70 is provided to limit and guide the movement of the pusher 30, thereby ensuring the accuracy and stability of the movement of the pusher 30.

[0083] like Figure 1 As shown, a cutting groove 13 is provided on the outer wall of the syringe 10 to prevent the cutter 111 from interfering with the syringe 10 when cutting the diaphragm 120, thereby ensuring the integrity of the syringe 10 and the cutter 111 and the safety of the cutting process.

[0084] like Figure 1 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.

[0085] Example 2

[0086] like Figures 8 to 12 A specific embodiment of the winding device shown includes the winding needle in Example 1.

[0087] like Figures 8 to 11 As shown, the winding device further includes a film pressing mechanism 90, a film pushing mechanism 100, and a film cutting mechanism 110. The film pressing mechanism 90 is used to press the diaphragm 120 against the outer wall of the syringe 10, the film pushing mechanism 100 can push the end of the diaphragm 120 into the placement groove 12, and the film cutting mechanism 110 is used to cut the diaphragm 120 on the side of the film pushing mechanism 100 away from the film pressing mechanism 90.

[0088] It is worth noting that after the film pressing mechanism 90 presses the diaphragm 120 onto the outer wall of the syringe 10 , the film cutting mechanism 110 cuts the diaphragm 120 to form the end of the diaphragm 120 , and the film pushing mechanism 100 then pushes the end of the diaphragm 120 into the placement groove 12 .

[0089] In this embodiment, if Figures 8 to 11 As shown, the film pressing mechanism 90 includes a pressing plate 91 and a second driving part 92, and the second driving part 92 can drive the pressing plate 91 to move closer to or away from the syringe 10; the film pushing mechanism 100 includes a pushing plate 101 and a third driving part 102, and the third driving part 102 can drive the pushing plate 101 to insert into or move out of the placement slot 12; the film cutting mechanism 110 includes a cutter 111 and a fourth driving part 112, and the fourth driving part 112 can drive the cutter 111 to move closer to or away from the syringe 10.

[0090] In this embodiment, if Figure 12 As shown, the push plate 101 is a comb-tooth structure, so that the adsorption force of the adsorption portion 60 can pass through the gaps of the comb-tooth structure and act on the diaphragm 120.

[0091] In this embodiment, the winding device further includes a fifth drive unit, which is in transmission connection with the film pressing mechanism 90, the film pushing mechanism 100, and the film cutting mechanism 110. The fifth drive unit can simultaneously drive the film pressing mechanism 90, the film pushing mechanism 100, and the film cutting mechanism 110 toward or away from the winding needle. Specifically, the fifth drive unit is connected to the second drive unit 92, the third drive unit 102, and the fourth drive unit 112.

[0092] In this embodiment, the second driving part 92 , the third driving part 102 , the fourth driving part 112 and the fifth driving part may be pneumatic cylinders, electric cylinders and the like.

[0093] Example 3

[0094] 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.

[0095] When using the winding device of Example 2, first, Figure 8 As shown, the fifth driving unit drives the film pressing mechanism 90, the film pushing mechanism 100 and the film cutting mechanism 110 to approach the winding needle, and the second driving unit 92 drives the pressing plate 91 to press the diaphragm 120 on the outer wall of the syringe 10, and the fourth driving unit 112 drives the cutter 111 to cut the diaphragm 120. The first driving unit 80 drives the pushing unit 30, so that the transmission rod 50 drives the expansion unit 20 to move from the retracted position to the supporting position, and the second plug-in rod 412 of the locking rod 41 moves from the first limiting portion 311 to the second limiting portion 313; then, as shown in FIG. Figure 9 and Figure 10 As shown, the fourth driving unit 112 drives the cutter 111 to retract, and the third driving unit 102 drives the push plate 101 to push the end of the diaphragm 120 into the placement groove 12, and the two adsorption parts 60 respectively adsorb and fix the two diaphragms 120; finally, as shown Figure 11 As shown, the second drive unit 92 drives the pressure plate 91 away from the winding needle, the third drive unit 102 drives the push plate 101 away from the winding needle, and the fifth drive unit simultaneously drives the film pressing mechanism 90, the film pushing mechanism 100, and the film cutting mechanism 110 away from the winding needle, so that the winding needle can rotate to start winding. When winding is completed, the first drive unit 80 pushes the push unit 30 again, causing the transmission rod 50 to drive the expansion unit 20 from the support position to the retracted position, and the second insertion rod 412 of the locking rod 41 to move from the second limit portion 313 to the first limit portion 311, while the adsorption unit 60 cancels the adsorption of the diaphragm 120. At this time, the battery cell clamping rod can be inserted into the receiving groove 23, so that the battery cell can be removed from the winding needle using the battery cell clamping rod.

[0096] According to the above description, this patent application has the following advantages:

[0097] 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.

[0098] 2. The diaphragm is fixed with the adsorption part to avoid pinch marks or indentations on the diaphragm, thus ensuring the quality of the diaphragm;

[0099] 3. The winding needle is integrated to improve the processing accuracy.

[0100] 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, provided on the wall of the syringe (10), suitable for fixing or loosening the diaphragm (120); A pushing portion (30) is movably inserted into the syringe (10), the pushing portion (30) is transmission-connected to the expansion portion (20), and can move along the axial direction of the syringe (10) to drive the expansion portion (20) to switch between the retracted position and the support position. When the expansion portion (20) is in the support position, the outer side of the expansion portion (20) cooperates with the outer wall of the syringe (10) to form an approximately complete circular structure. When the expansion portion (20) is in the retracted position, a gap is generated between the outside of the syringe (10) and the inside of the battery cell. A locking structure (40) is provided between the pushing portion (30) and the syringe (10). When the expansion portion (20) is located in the retracted position, the locking structure (40) is located in a first locking position on the pushing portion (30). When the expansion portion (20) is located in the supporting position, the locking structure (40) is located in a second locking position on the pushing portion (30).

2. The winding needle according to claim 1, characterized in that The locking structure (40) includes a locking rod (41) and an elastic member (42), a guide groove (31) is provided on the pushing portion (30), the first locking position and the second locking position are located on the guide groove (31), one end of the locking rod (41) is rotatably connected to the syringe (10), the other end of the locking rod (41) is inserted into the guide groove (31) and can move along the guide groove (31) between the first locking position and the second locking position, the elastic member (42) is arranged between the pushing portion (30) and the syringe (10), and the elastic member (42) is suitable for applying an elastic force to the pushing portion (30) in the opposite direction to the pushing direction of the pushing portion (30).

3. The winding needle according to claim 2, characterized in that The guide groove (31) is an annular groove body that penetrates the circumference. The first side of the inner groove wall of the guide groove (31) is recessed inward to form a first limiting portion (311). The first side of the outer groove wall of the guide groove (31) is recessed inward to form a first tip (312). The second side of the outer groove wall of the guide groove (31) protrudes outward to form a second limiting portion (313). The second side of the inner groove wall of the guide groove (31) protrudes outward to form a second tip (314). The first locking position corresponds to the first limiting portion (311), and the second locking position corresponds to the second limiting portion (311). The guide groove (31) is provided with a first path (315) and a second path (316) which are connected and arranged corresponding to the first limiting portion (313). Under the restriction of the first tip (312), the locking rod (41) is suitable for moving from the first limiting portion (311) to the second limiting portion (313) along the first path (315). Under the restriction of the second tip (314) and the first tip (312), the locking rod (41) is suitable for moving from the second limiting portion (313) to the first limiting portion (311) along the second path (316).

4. The winding needle according to claim 2, characterized in that The locking rod (41) includes a first plug-in rod (411), a second plug-in rod (412) and a connecting rod (413), wherein the first plug-in rod (411) passes through the pushing portion (30) and is rotatably connected to the inner wall of the syringe (10), the second plug-in rod (412) is inserted into the guide groove (31), and the connecting rod (413) connects the first plug-in rod (411) and the second plug-in rod (412), and the pushing portion (30) is provided with a sliding groove (32) suitable for accommodating the first plug-in rod (411) and allowing the first plug-in rod (411) to move relative to each other.

5. The winding needle according to any one of claims 1 to 4, characterized in that: The winding needle further comprises a transmission rod (50), one end of the transmission rod (50) is hinged to the expansion part (20), and the other end of the transmission rod (50) is hinged to the pushing part (30).

6. The winding needle according to any one of claims 1 to 4, characterized in that: There are two expansion parts (20), and there are also two mounting grooves (11). The two mounting grooves (11) are arranged opposite to each other on the syringe (10), and the two expansion parts (20) are arranged corresponding to the two mounting grooves (11).

7. The winding needle according to any one of claims 1 to 4, characterized in that: The syringe (10) has a placement groove (12) on its wall, and the placement groove (12) is suitable for inserting the end of the diaphragm (120); the diaphragm fixing structure includes an adsorption portion (60), and at least two adsorption portions (60) are provided, and at least two adsorption portions (60) are respectively provided on both sides of the placement groove (12), and the adsorption portion (60) is suitable for adsorbing and fixing the corresponding diaphragm (120).

8. The winding needle according to any one of claims 1 to 4, characterized in that: The winding needle also includes a guide block (70), which is arranged inside the needle cylinder (10) and connected to the inner wall of the needle cylinder (10), and the pushing part (30) is inserted into the inside of the guide block (70) and is slidably connected to the guide block (70).

9. 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).

10. 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).

11. The winding needle according to any one of claims 1 to 4, characterized in that: The winding needle further comprises a first driving portion (80), and the first driving portion (80) is suitable for pushing the pushing portion (30) to move.

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 (90), the film pressing mechanism (90) being adapted to press the diaphragm (120) onto the outer wall of the syringe (10); A film pushing mechanism (100), wherein the film pushing mechanism (100) is suitable for pushing the end of the diaphragm (120) into the placement groove (12) provided on the syringe (10); A film cutting mechanism (110) is provided, wherein the film cutting mechanism (110) is suitable for cutting the diaphragm (120) on the side of the film pushing mechanism (100) away from the film pressing mechanism (90).

14. The winding device according to claim 13, characterized in that The film pressing mechanism (90) comprises a pressing plate (91) and a second driving portion (92), wherein the second driving portion (92) is adapted to drive the pressing plate (91) to move closer to or away from the syringe (10); and / or, The film pushing mechanism (100) comprises a pushing plate (101) and a third driving portion (102), wherein the third driving portion (102) is adapted to drive the pushing plate (101) to be inserted into or removed from the placement slot (12); and / or, The film cutting mechanism (110) comprises a cutter (111) and a fourth driving portion (112), wherein the fourth driving portion (112) is adapted to drive the cutter (111) to move closer to or away from the syringe (10).

15. The winding device according to claim 14, characterized in that The push plate (101) is a comb-tooth structure.

16. The winding device according to claim 14, characterized in that The winding device also includes a fifth driving unit, which is in transmission connection with the film pressing mechanism (90), the film pushing mechanism (100) and the film cutting mechanism (110). The fifth driving unit is suitable for driving the film pressing mechanism (90), the film pushing mechanism (100) and the film cutting mechanism (110) to approach or move away from the winding needle at the same time.

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

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