Winding needle mechanism and battery cell winding equipment
By designing a simultaneously movable needle roll mechanism, the problem of the bare battery easily pulling out the core during the rolling of the lithium battery is solved, and the yield rate of the battery cell is improved.
Patent Information
- Application Number
- CN202421494512.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In the existing lithium battery winding technology, the single-sided fixed needle structure causes the bare battery to easily pull out the core during the winding process, resulting in the problem of low yield.
A needle rolling mechanism is designed in which two needle rolling needles can be opened and closed at the same time, thereby achieving simultaneous staggered needles and reducing the situation of naked electric core pulling.
Through the design of two coil needles moving at the same time, the situation of the naked cell core extraction is reduced and the yield of the cell is improved.
Smart Images
Figure CN222939971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery cell winding, in particular to a winding needle mechanism and a cell winding device. Background Technique
[0002] In the production and manufacturing process of batteries, winding is an important production process for lithium batteries; mainly through a winding needle, a positive electrode sheet, a negative electrode sheet, and a separator are wound to form a wound core. The winding needle is an important component of the winding device. Currently, common winding needles include circular winding needles, elliptical winding needles, etc. People will selectively use circular or elliptical winding needles according to the battery process.
[0003] Currently, the structure of the circular winding needle on the market adopts a single-sided fixed winding needle, and the other side is a movable winding needle. The intermediate structure is a spline shaft plus a cylinder structure to achieve the misalignment of the winding needle. After the winding needle is misaligned, the movable needle changes from a tensioned state to an initial state. This causes half of the innermost layer of the bare cell to be in contact with the winding needle, and there is a gap between the other half and the movable needle. When pulling out the needle with a gap, it is not easy to extract the core of the bare cell, while it is easy to extract the core of the bare cell on the side of the fixed needle in contact with the winding needle. Due to different processes, the winding length of the bare cell is different. When the movable needle is at the lower half of the bare cell, due to its own weight, it will press on the inner layer of the bare cell, and there will still be a situation of core extraction. In summary, this structure is complex and prone to problems such as core extraction and scrapping of the cell. Summary of the Utility Model
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a winding needle mechanism and a cell winding device. The two winding needles are simultaneously movable and can be opened and closed simultaneously, so as to realize the function of simultaneous misalignment of the winding needles, effectively reducing the situation of core extraction of the bare cell and greatly improving the yield rate of the bare cell.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A winding needle mechanism includes a stop member, a winding needle base, a first transmission member, a second transmission member, and two parallel and symmetrically arranged winding needles. The two winding needles are movably connected to the winding needle base, and the stop member drives the two winding needles to approach or separate from each other through the first transmission member and the second transmission member; the stop member includes a support frame and a stop ring slidably connected to the support frame. A first cam follower is arranged on the stop ring. The first transmission member includes a fixed seat and a moving seat slidably connected to the fixed seat. A cam block abutted against the first cam follower is arranged on the moving seat; a track groove is arranged on the moving seat, and a bearing is slidably connected in the track groove. The central axis of the bearing is fixedly connected to the second transmission member.
[0007] As a further improvement of the above technical solution, an opening for the sliding of the movable seat is provided on the fixed seat, and the movable seat is slidably connected to the fixed seat through a linear bearing.
[0008] As a further improvement of the above technical solution, a first elastic member is connected between the fixed seat and the movable seat, and the first elastic member is used to provide a force to move the movable seat upward.
[0009] As a further improvement of the above technical solution, the cam block has a first inclined abutting surface. When the first cam follower moves away from the winding needle, it abuts against the first inclined abutting surface and pushes the cam block to move. The moving direction of the cam block is perpendicular to the moving direction of the first cam follower.
[0010] As a further improvement of the above technical solution, a reset block is provided on the side of the movable seat facing away from the cam block, and a second cam follower is provided on the side of the stop ring facing away from the first cam follower. The second cam follower abuts against the reset block. A second inclined abutting surface is provided on the reset block, and the inclination direction of the second inclined abutting surface is centrosymmetrically arranged with the inclination direction of the first abutting surface. When the second cam follower moves towards the winding needle, it abuts against the second inclined abutting surface and pushes the reset block to move. The moving direction of the reset block is the opposite direction of the movement of the cam block.
[0011] As a further improvement of the above technical solution, the second transmission member includes a clamping guide block and a clamping sleeve for the splints. The clamping guide block is connected to one end of the clamping sleeve for the splints. The central axis of the bearing is fixedly connected to the clamping guide block. When the bearing moves along the track of the track groove, it drives the clamping guide block and the clamping sleeve for the splints to move along the length direction of the winding needle, so as to drive the two winding needles to approach or move away from each other.
[0012] As a further improvement of the above technical solution, a winding needle fixing sleeve is provided on the winding needle base. The two winding needles are respectively fixedly installed on a winding needle mounting plate. A guiding member is connected between the two winding needle mounting plates and the winding needle fixing sleeve, and the winding needle mounting plate can move towards or away from the winding needle mounting plate direction based on the guiding member.
[0013] As a further improvement of the above technical solution, a second elastic member is connected between the winding needle mounting plate and the winding needle fixing sleeve, and the second elastic member is used to provide a force to drive the winding needle mounting plate to move away from the winding needle mounting plate direction.
[0014] As a further improvement of the above technical solution, first inclined surfaces are provided on opposite sides of the two needle winding plates, and a second inclined surface is provided on the inner wall of the clamping plate tightening sleeve. The two needle winding plates are located inside the clamping plate tightening sleeve, and the first inclined surface abuts against the second inclined surface.
[0015] The present utility model further provides the following technical solution:
[0016] A battery core winding device includes a driving device for driving the needle winding mechanism to rotate for winding the battery core, and the needle winding base is fixedly arranged at the output end of the driving device through a mounting seat.
[0017] The beneficial effect of the present utility model is that under the drive of the stop member, through the transmission of the first transmission member and the second transmission member, the two needles approach or move away from each other, that is, the two needles move simultaneously and can open and close simultaneously. In this way, after the needles are misaligned, there is a certain gap between the two needles and the innermost diaphragm of the bare battery core, and this gap ensures that the bare battery core does not get its core pulled out during unloading and needle pulling, improving the yield rate of the wound battery core. Description of the Drawings
[0018] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0019] Figure 1 is a schematic structural view of the needle winding mechanism in an embodiment of the present utility model Figure 1 ;
[0020] Figure 2 is a schematic structural view of the needle winding mechanism in an embodiment of the present utility model Figure 2 ;
[0021] Figure 3 is an exploded view of the structure of the needle winding mechanism in an embodiment of the present utility model;
[0022] Figure 4 is a cross-sectional view of the needle winding mechanism in an embodiment of the present utility model.
[0023] Reference numerals: 1, mounting seat; 2, needle; 21, cylindrical inner clamping needle; 22, needle auxiliary piece; 23, needle fixing sleeve; 3, stop member; 31, first fixing ring; 32, second fixing ring; 33, pushing ring; 34, first guiding member; 35, first cam follower; 36, second cam follower; 4, needle winding base; 51, fixing seat; 52, moving seat; 53, cam block; 54, track groove; 55, reset block; 56, second guiding member; 57, first elastic member; 61, tightening guiding block; 62, clamping plate tightening sleeve; 621, second inclined surface; 622, third inclined surface; 63, bearing; 64, central shaft. Detailed Embodiments
[0024] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present utility model. In addition, all connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the possibility of forming a better connection structure by adding or reducing connection accessories according to specific implementation situations. For example, fixed connection / installation can be achieved by using accessories such as screws and bolts, or directly by welding, bonding, etc. Each technical feature in the present utility model can be combined interactively on the premise of not conflicting with each other.
[0025] Referring to Figures 1-3 , an embodiment of the present utility model provides a needle winding mechanism, which includes a stopper 3, a needle winding base 4, a first transmission member, a second transmission member, and two needle windings 2 that are parallel and symmetrically arranged. The two needle windings 2 are movably connected to the needle winding base 4, and the stopper 3 drives the two needle windings 2 to approach or separate from each other through the first transmission member and the second transmission member, that is, the two needle windings 2 move simultaneously. In this way, when the two needle windings 2 are simultaneously closed and misaligned, there is a certain gap between the two needle windings 2 and the innermost diaphragm of the bare battery cell. This gap ensures that the bare battery cell does not have its core pulled out during unloading and needle extraction, thereby improving the yield of the wound battery cell.
[0026] Referring to Figure 3 and Figure 4 , in this embodiment, the stopper 3 includes a support frame and a stopper ring 33 slidably connected to the support frame. Specifically, the support frame includes a first fixing ring 31, a second fixing ring 32, and a first guiding member 34 connected between the two. The guiding member includes a guiding rod and a guiding sleeve. The guiding rod is used to connect and fix the first fixing ring 31 and the second fixing ring 32. The guiding sleeve is slidably connected to the guiding rod, and a guiding hole is provided on the stopper ring 33. The guiding sleeve is arranged in the guiding hole with an interference fit, so as to realize the sliding of the stopper ring 33 on the support frame. The driving member for the stopper ring 33 to slide on the support frame is a cylinder (not shown).
[0027] Further, the first transmission member includes a fixed seat 51 and a moving seat 52 slidably connected to the fixed seat 51. Specifically, a second guiding member 56 is provided on the fixed seat 51, and the second guiding member 56 adopts a linear bearing 63. The moving seat 52 slides in the vertical direction through the linear bearing 63. A cam block 53 is provided on the upper side of the moving seat 52, and a first cam follower 35 is provided on the upper side of the stop ring 33. The cam block 53 has a first inclined abutting surface that is inclined towards the direction of the winding needle 2. When the first cam follower 35 moves leftward (away from the winding needle 2), it can abut against the first inclined abutting surface. When the first cam follower 35 continues to move, it pushes the cam block 53 downward. The moving direction of the cam block 53 is perpendicular to the moving direction of the first cam follower 35, so that the moving seat 52 moves downward.
[0028] Furthermore, a track groove 54 is provided on the moving seat 52. The upper end of the track groove 54 is closer to the winding needle 2 than the lower end of the track groove 54. A bearing 63 is slidably connected in the track groove 54, and the central axis 64 of the bearing 63 is fixedly connected to the second transmission member. Thus, when the moving seat 52 moves downward, the bearing 63 moves rightward (towards the winding needle 2) under the limitation of the track groove 54, and then drives the second transmission member to move rightward. When the second transmission member moves rightward, it drives the two winding needles 2 to move away from each other, that is, the two winding needles 2 are in an open state.
[0029] In addition, referring to Figure 3 and Figure 4 , a first elastic member 57 is connected between the bottom of the moving seat 52 and the fixed seat 51. The first elastic member 57 is used to provide a force to make the moving seat 52 move upward, and the elastic force of the first elastic member 57 is greater than the gravity of the moving seat 52. In this way, when the external force disappears, the bearing 63 can also be located at the lower end of the track groove 54, and the two winding needles 2 are in a self-locking open state.
[0030] In some embodiments, referring to Figure 3 and Figure 4, a reset block 55 is provided on the lower side of the moving seat 52, and a second cam follower 36 is provided on the lower side of the stop ring 33. The reset block 55 has a second inclined abutting surface, and the second inclined abutting surface is inclined away from the winding needle 2, that is, the inclination direction of the second inclined abutting surface is centrosymmetrically arranged with the inclination direction of the first abutting surface. When the second cam follower 36 moves to the right, it can abut against the second inclined abutting surface. When the second cam follower 36 continues to move, it pushes the reset block 55 to move upward, so that the moving seat 52 moves upward, and then drives the second transmission member to move to the left under the action of the bearing 63 and the track groove 54. When the second transmission member moves to the left, it drives the two winding needles 2 to move closer to each other until the two winding needles 2 are in a closed state, which is convenient for the unloading work of the wound battery core.
[0031] In some embodiments, referring to Figure 3 and Figure 4 , the second transmission member includes a clamping guide block 61 and a clamping plate clamping sleeve 62. The clamping guide block 61 is fixedly connected to one end of the clamping plate clamping sleeve 62. The central axis 64 of the bearing 63 is fixedly connected to the clamping guide block 61. When the bearing 63 moves along the track of the track groove 54, it drives the clamping guide block 61 and the clamping plate clamping sleeve 62 to move along the length direction of the winding needle 2 to drive the two winding needles 2 to move closer to or away from each other.
[0032] A winding needle fixing sleeve 23 is provided on the winding needle base 4. Specifically, each of the two winding needles 2 includes a cylindrical inner clamping needle 21 and a winding needle sub-piece 22. The cylindrical inner clamping needle 21 and the winding needle sub-piece 22 are respectively fixedly connected to the first winding needle mounting plate and the second winding needle mounting plate. Both of the two second winding needle mounting plates are connected to the winding needle fixing sleeve 23 through a third guiding member and a second elastic member, and the two first winding needle mounting plates are connected through a fourth guiding member and a third elastic member, so that the cylindrical inner clamping needles 21 and the winding needle sub-pieces 22 of the two winding needles 2 can move.
[0033] On the opposite sides of the two first needle winding plates, there are first inclined surfaces provided. On the inner wall of the clamping plate tightening sleeve 62, there is a second inclined surface 621. The two first needle winding plates are located within the clamping plate tightening sleeve 62, and the first inclined surface abuts against the second inclined surface 621. In this way, when the clamping plate tightening sleeve 62 moves to the right, it drives the two cylindrical inner clamping needles 21 to move away from each other simultaneously, causing the two cylindrical inner clamping needles 21 to be in an open state. At the same time, on the opposite sides of the two second needle winding plates, there are fourth inclined surfaces provided. On the outer wall of the clamping plate tightening sleeve 62, there is a third inclined surface 622. The third inclined surface 622 is located on the back side of the second inclined surface 621, and the inclination direction of the third inclined surface 622 is opposite to that of the second inclined surface 621. The clamping plate tightening sleeve 62 is located between the two second needle winding plates, and the third inclined surface 622 abuts against the fourth inclined surface. In this way, when the clamping plate tightening sleeve 62 moves to the right, it drives the two needle winding sub - plates 22 to move away from each other simultaneously, causing the two needle winding sub - plates 22 to be in an open state.
[0034] An embodiment of the present utility model provides a battery cell winding device, including a driving device. The driving device is used to drive the rotation of the needle winding mechanism 2 to perform the winding work of the battery cell. The needle winding base 4 is fixedly arranged at the output end of the driving device through a mounting seat 1, and the first fixing ring 31 is also fixedly installed on the mounting seat 1.
[0035] The above is a specific description of the preferred embodiment of the present utility model. However, the creation of the present utility model is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present utility model. These equivalent deformations or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A needle winding mechanism, characterized in that: It includes a stopper, a winding needle base, a first transmission member, a second transmission member and two winding needles arranged in parallel and symmetrically, the two winding needles are movably connected to the winding needle base, and the stopper drives the two winding needles to approach or move away from each other through the first transmission member and the second transmission member; the stopper includes a support frame and a stop ring slidably connected to the support frame, a first cam follower is arranged on the stop ring, the first transmission member includes a fixed seat and a movable seat slidably connected to the fixed seat, a cam block abutting against the first cam follower is arranged on the movable seat; a track groove is arranged on the movable seat, a bearing is slidably connected in the track groove, and a central axis of the bearing is fixedly connected to the second transmission member.
2. A needle winding mechanism according to claim 1, characterized in that: The fixed seat is provided with an opening for the movable seat to slide, and the movable seat is slidably connected with the fixed seat via a linear bearing.
3. The needle winding mechanism according to claim 1, characterized in that: A first elastic member is connected between the fixed seat and the movable seat, and the first elastic member is used to provide a force to enable the movable seat to move upward.
4. The needle winding mechanism according to claim 1, characterized in that: The cam block has a first inclined abutting surface. When the first cam follower moves in a direction away from the winding needle, it abuts against the first inclined abutting surface and pushes the cam block to move. The moving direction of the cam block is perpendicular to the moving direction of the first cam follower.
5. A needle winding mechanism according to claim 4, characterized in that: A reset block is provided on the side of the moving seat away from the cam block, and a second cam follower is provided on the side of the stopping ring away from the first cam follower. The second cam follower abuts against the reset block, and a second inclined abutting surface is provided on the reset block, and the inclination direction of the second inclined abutting surface is centrally symmetrical. When the second cam follower moves toward the direction of the winding needle, it abuts against the second inclined abutting surface and pushes the reset block to move, and the direction of movement of the reset block is opposite to the direction of movement of the cam block.
6. The needle winding mechanism according to claim 1, characterized in that: The second transmission member includes a tightening guide block and a clamping plate tightening sleeve, the tightening guide block is connected to one end of the clamping plate tightening sleeve, the central axis of the bearing is fixedly connected to the tightening guide block, and when the bearing moves along the track of the track groove, it drives the tightening guide block and the clamping plate tightening sleeve to move along the length direction of the winding needle to drive the two winding needles to move closer to or away from each other.
7. A needle winding mechanism according to claim 6, characterized in that: A winding needle fixing sleeve is provided on the winding needle base, and the two winding needles are respectively fixedly mounted on a winding needle mounting plate. The two winding needle mounting plates are connected to the winding needle fixing sleeve through a guide piece, and the winding needle mounting plate can move toward or away from the winding needle mounting plate based on the guide piece.
8. The needle winding mechanism according to claim 7, characterized in that: A second elastic member is connected between the winding needle mounting plate and the winding needle fixing sleeve, and the second elastic member is used to provide a force to drive the winding needle mounting plate to move away from the winding needle mounting plate.
9. The needle winding mechanism according to claim 7, characterized in that: The two winding needle mounting plates are each provided with a first inclined surface on the opposite side thereof, the inner wall of the clamping plate tight sleeve is provided with a second inclined surface, the two winding needle mounting plates are located in the clamping plate tight sleeve, and the first inclined surface abuts against the second inclined surface.
10. A battery cell winding device, characterized in that: It comprises a driving device, which is used to drive the winding needle mechanism described in any one of claims 1 to 9 to rotate so as to wind the battery core, and the winding needle base is fixedly arranged at the output end of the driving device through a mounting seat.