A lithium battery electrode changing mechanism and a lithium battery electrode winding device

Abstract

This invention provides a lithium battery electrode changing mechanism and a lithium battery electrode winding device. The lithium battery electrode changing mechanism includes a reversing roller assembly and a lifting drive assembly. The reversing roller assembly includes a support, a rotating frame, a reversing drive module, a first pressure roller, a second pressure roller, and multiple guide rollers. The rotating frame is rotatably mounted on the support. Compared with the prior art, after completing the changing operation, the lithium battery electrode changing mechanism of this invention rotates the rotating frame to a suitable position, so that the electrode only abuts against the guide rollers and not against the first and second pressure rollers during the winding process. This avoids wear on the first and second pressure rollers, improves their service life, and increases the changing success rate. Moreover, the rotating frame is driven by a motor, making the position switching of the first and second pressure rollers more accurate and the pressure of the first and second pressure rollers on the winding drum more stable, which is conducive to improving the changing success rate.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, specifically to a lithium battery electrode changing mechanism and a lithium battery electrode winding device. Background Technology

[0002] During the production of lithium battery electrodes, a winding device is required for winding. In order to improve winding efficiency, the winding device is usually equipped with multiple winding drums. After one winding drum completes winding, the electrode is switched to another winding drum by a winding changing mechanism to continue winding. The winding drum that has completed winding is then unloaded. This back-and-forth switching improves winding efficiency.

[0003] Current roll-changing mechanisms typically include a pressure roller and a telescopic cylinder. The pressure roller presses the electrode sheet against the surface of an empty take-up drum covered with double-sided tape, causing the electrode sheet to be wound up by the empty take-up drum. The pressure roller, driven by the telescopic cylinder, swings between two take-up drums to achieve switching. Since the surface of the pressure roller needs to press against the empty take-up drum, the outer circumference of the pressure roller should be made of a soft, elastic material, such as rubber (the following explanation uses rubber as an example), to avoid damaging the electrode sheet or the take-up drum. However, during the electrode sheet winding process, the pressure roller also functions as a guide roller. When the electrode sheet is wound, it passes over the pressure roller and continuously rubs against it, causing the rubber on the outer circumference of the pressure roller to wear easily. The worn outer circumference of the guide roller may not be able to accurately and effectively press the electrode sheet onto the surface of the empty take-up drum covered with double-sided tape, resulting in a high roll-changing failure rate. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a lithium battery electrode changing mechanism and a lithium battery electrode winding device.

[0005] One embodiment of this utility model provides a lithium battery electrode changing mechanism, comprising:

[0006] A reversing roller assembly includes a support, a rotating frame, a reversing drive module, a first pressure roller, a second pressure roller, and multiple guide rollers. The rotating frame is rotatably mounted on the support, and the reversing drive module is drivenly connected to the rotating frame. The first pressure roller and the second pressure roller are arranged side by side on the rotating frame and are rotatably engaged with the rotating frame. The multiple guide rollers are rotatably mounted on the rotating frame and located between the first pressure roller and the second pressure roller, wherein a material passage space is formed between the multiple guide rollers for material to pass through.

[0007] A lifting drive assembly is provided, which is driven to the bracket, and the bracket is raised and lowered under the drive of the lifting drive assembly. Compared with the prior art, the lithium battery electrode changing mechanism of this utility model, after completing the changing operation, rotates the rotating frame to a suitable position so that the electrode only abuts against the roller during the winding process and does not abut against the first pressure roller and the second pressure roller, thereby avoiding wear on the first pressure roller and the second pressure roller, improving the service life of the first pressure roller and the second pressure roller, and improving the changing success rate; moreover, the rotating frame is driven by a motor, the position switching of the first pressure roller and the second pressure roller is more accurate, and the pressure of the first pressure roller and the second pressure roller on the winding drum is more stable, which is conducive to improving the changing success rate.

[0008] In some alternative embodiments, the plurality of feed rollers includes two first feed rollers and two second feed rollers, the feed space being formed between the two first feed rollers and the two second feed rollers, the two first feed rollers being located on the side of the feed space facing the first pressure roller, and the two second feed rollers being located on the side of the feed space facing the second pressure roller.

[0009] In some alternative embodiments, two first guide rollers are arranged sequentially in a direction perpendicular to the first pressure roller to the second pressure roller, and the distance between the two first guide rollers on the side away from each other is greater than the diameter of the first pressure roller. Two second guide rollers are arranged sequentially in a direction perpendicular to the first pressure roller to the second pressure roller, and the distance between the two second guide rollers on the side away from each other is greater than the diameter of the second pressure roller.

[0010] In some alternative embodiments, the outer peripheral surfaces of the first and second pressure rollers are provided with pressure rubber.

[0011] In some alternative implementations, the commutation drive module includes a commutation drive motor, which is drivenly connected to the rotating frame.

[0012] In some optional embodiments, two outer base plates are provided on both sides of the bracket, and an installation space is formed between the two outer base plates. The rotating frame, the first pressure roller, the second pressure roller, and the guide roller are disposed in the installation space. A drive shaft is provided on the side of the rotating frame. The drive shaft passes through the outer base plates and extends to the side of the outer base plates away from the installation space. The reversing drive motor is mounted on the outer base plates and located in the installation space. The output shaft of the reversing drive motor is connected to the drive shaft through a drive belt module. The drive belt module is disposed on the side of the outer base plates away from the installation space.

[0013] In some optional embodiments, the commutation drive module includes two commutation drive motors, which are respectively mounted on two outer base plates. A drive shaft is provided on each side of the rotating frame, and the output shaft of the commutation drive motor is connected to the drive shaft via the drive belt module.

[0014] In some optional embodiments, the lifting drive assembly includes a plurality of lifting guide racks, a plurality of transmission gears, and a lifting drive motor. The lifting drive motor is mounted on the bracket, and the output shaft of the lifting drive motor is drivenly connected to the transmission gears. The lifting guide racks are located on the side of the bracket and mesh with the transmission gears.

[0015] In some alternative embodiments, the lifting drive assembly further includes a plurality of lifting guide rails, and the bracket slides in cooperation with the lifting guide rails.

[0016] One embodiment of this utility model provides a lithium battery electrode winding device, including: a lithium battery electrode changing mechanism as described above.

[0017] Compared to existing technologies, the lithium battery electrode changing mechanism of this invention, after completing the changing operation, rotates the rotating frame to a suitable position so that the electrode only abuts against the overroller during the winding process and does not abut against the first and second pressure rollers. This avoids wear on the first and second pressure rollers, improves their service life, and increases the success rate of changing the coil. Moreover, the rotating frame is driven by a motor, making the position switching of the first and second pressure rollers more accurate and the pressure of the first and second pressure rollers on the winding drum more stable, which is conducive to improving the success rate of changing the coil.

[0018] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one side of a lithium battery electrode changing mechanism according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the other side of the lithium battery electrode changing mechanism according to one embodiment of the present invention;

[0021] Figure 3 This is a flowchart illustrating a portion of the reversing roller assembly according to an embodiment of the present invention during the lower winding process.

[0022] Figure 4 This is a schematic diagram of a portion of the reversing roller assembly according to an embodiment of the present invention during the process from the lower winding change to the upper winding.

[0023] Figure 5 This is a schematic diagram of a portion of the reversing roller assembly according to an embodiment of the present invention during the process of switching from upper winding to lower winding.

[0024] Figure 6 This is a schematic diagram of a portion of the reversing roller assembly according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of a lithium battery electrode winding device according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Reversing roller assembly; 11. Support bracket; 111. Outer base plate; 12. Rotating frame; 121. Drive shaft; 13. Reversing drive module; 131. Reversing drive motor; 132. Drive belt module; 14. First pressure roller; 141. Pressing soft rubber; 15. Second pressure roller; 16. Passing roller; 161. First passing roller; 162. Second passing roller; 17. Passing space; 20. Lifting drive assembly; 21. Lifting guide rack; 22. Transmission gear; 23. Lifting drive motor; 24. Lifting guide rail; 30. Upper winding drum; 40. Lower winding drum. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Please see Figure 1 and Figure 2 One embodiment of this utility model provides a lithium battery electrode changing mechanism, comprising:

[0033] The reversing roller assembly 10 includes a support 11, a rotating frame 12, a reversing drive module 13, a first pressure roller 14, a second pressure roller 15, and multiple passing rollers 16. The rotating frame 12 is rotatably mounted on the support 11. The reversing drive module 13 is drivenly connected to the rotating frame 12. The first pressure roller 14 and the second pressure roller 15 are arranged side by side on the rotating frame 12 and are rotatably engaged with the rotating frame 12. The multiple passing rollers 16 are rotatably mounted on the rotating frame 12 and are located between the first pressure roller 14 and the second pressure roller 15. A material passage space 17 is formed between the multiple passing rollers 16 for material to pass through.

[0034] The lifting drive assembly 20 is connected to the bracket 11, and the bracket 11 is lifted and lowered under the drive of the lifting drive assembly 20.

[0035] In the working environment of this embodiment, an upper take-up drum 30 is arranged above the reversing roller assembly 10, and a lower take-up drum 40 is arranged below the reversing roller assembly 10. The lithium battery electrode changing mechanism needs to switch the electrode to the upper take-up drum 30 and the lower take-up drum 40. The working principle of the lithium battery electrode changing mechanism of this embodiment is explained below:

[0036] Please see Figure 3The lower winding process: Assuming the initial state is that the lower winding drum 40 is winding the electrode sheet, at this time the rotating frame 12 is at the first winding angle relative to the support 11, the electrode sheet passes through the material passage 17 and abuts against the roller 16, but does not contact the first pressure roller 14 and the second pressure roller 15.

[0037] Please see Figure 4 The process of switching from lower take-up to upper take-up is as follows: After the lower take-up drum 40 completes the electrode winding, it needs to switch the electrode to the upper take-up drum 30 for winding. The rotating frame 12 rotates 180° in the preset direction to the first pressing angle, so that the first pressure roller 14 rotates and abuts against the bottom of the electrode, while the second pressure roller 15 rotates and abuts against the top of the electrode, thereby tightening the electrode. The lifting drive assembly 20 drives the bracket 11 to rise, and the first pressure roller 14 presses the electrode onto the upper take-up drum 30, so that the electrode and the upper take-up drum 30 are bonded together. The part of the electrode between the upper take-up drum 30 and the lower take-up drum 40 is cut off, and the rotating frame 12 is rotated 60° in the opposite direction of the preset direction to the second winding angle, so that the electrode is separated from the first pressure roller 14 and the second pressure roller 15. Then the upper take-up drum 30 can wind up the electrode.

[0038] Upper winding process: The upper winding drum 30 winds up the electrode sheet. At this time, the electrode sheet will not wear the first pressure roller 14 and the second pressure roller 15. When the upper winding drum 30 winds up, the electrode sheet on the lower winding drum 40 can be unloaded.

[0039] Please see Figure 5 The process of switching from upper to lower take-up reel is as follows: After the upper take-up reel 30 completes the electrode winding, it needs to be switched to the lower take-up reel 40 for winding. The rotating frame 12 rotates 180° in the opposite direction of the preset direction to the second pressing angle, so that the second pressure roller 15 rotates and abuts against the top of the electrode, while the first pressure roller 14 rotates and abuts against the bottom of the electrode, thereby tightening the electrode. The lifting drive assembly 20 drives the bracket 11 to descend, and the second pressure roller 15 presses the electrode onto the lower take-up reel 40, so that the electrode adheres to the adhesive of the first take-up reel. Before the lower take-up reel 40 winds up the electrode, the part of the electrode between the upper take-up reel 30 and the lower take-up reel 40 is cut off, and the rotating frame 12 is rotated 60° in the preset direction to the second winding angle, so that the electrode is separated from the first pressure roller 14 and the second pressure roller 15. Then the lower take-up reel 40 can wind up the electrode.

[0040] The second winding process: the lower winding drum 40 winds up the electrode sheet. At this time, the electrode sheet will not wear the first pressure roller 14 and the second pressure roller 15. When the lower winding drum 40 winds up, the electrode sheet on the upper winding drum 30 can be unloaded. Then the above steps are repeated to achieve continuous winding of the electrode sheet.

[0041] Please see Figure 6The specific structure of the guide roller 16 can be designed according to actual needs. For example, in some optional embodiments, the multiple guide rollers 16 include two first guide rollers 161 and two second guide rollers 162. The material feeding space 17 is formed between the two first guide rollers 161 and the two second guide rollers 162. The two first guide rollers 161 are located on the side of the material feeding space 17 facing the first pressure roller 14, and the two second guide rollers 162 are located on the side of the material feeding space 17 facing the second pressure roller 15. Since there is no need to provide flexible or elastic material on the guide rollers 16, the diameter of the guide rollers 16 is usually smaller than that of the first pressure roller 14 and the second pressure roller 15. Therefore, the purpose of setting two first guide rollers 161 and two second guide rollers 162 is to extend the length of the material feeding space 17 in the material feeding direction as much as possible, thereby avoiding the electrode sheet from contacting the first pressure roller 14 or the second pressure roller 15.

[0042] In some alternative embodiments, two first guide rollers 161 are arranged sequentially in a direction perpendicular to the first pressure roller 14 to the second pressure roller 15. The distance between the two first guide rollers 161 on the side away from each other is greater than the diameter of the first pressure roller 14. This makes it less likely for the electrode sheet to come into contact with the first guide rollers 161 during the upper winding process or the lower winding process, due to the larger distance between the two first guide rollers 161. Similarly, two second guide rollers 162 are arranged sequentially in a direction perpendicular to the first pressure roller 14 to the second pressure roller 15. The distance between the two second guide rollers 162 on the side away from each other is greater than the diameter of the second pressure roller 15. This makes it less likely for the electrode sheet to come into contact with the second guide rollers 162 during the upper winding process or the lower winding process, due to the larger distance between the two second guide rollers 162. The statement that the distance between the two first guide rollers 161 on their furthest sides is greater than the diameter of the first pressure roller 14 means that, dividing the two first guide rollers 161 into A first guide roller 161 and B first guide roller 161, the straight-line distance between the outer circumferential surface of A first guide roller 161 on the side furthest from B first guide roller 161 and the outer circumferential surface of B first guide roller 161 on the side furthest from A first guide roller 161 must be greater than the diameter of the first pressure roller 14. Similarly, the statement that the distance between the two second guide rollers 162 on their furthest sides is greater than the diameter of the second pressure roller 15 is also true.

[0043] In some alternative embodiments, the outer peripheral surfaces of the first pressure roller 14 and the second pressure roller 15 are provided with pressure soft rubber 141. The soft rubber is elastic and can provide cushioning. The electrode sheet is pressed by the soft and elastic pressure soft rubber 141, which is not easy to damage the electrode sheet.

[0044] In some optional embodiments, the commutation drive module 13 includes a commutation drive motor 131, which is drivenly connected to the rotating frame 12. The commutation drive motor 131 enables precise angle control of the rotating frame 12. Preferably, the commutation drive motor 131 is a servo motor, which helps to improve the accuracy of rotation control.

[0045] In some optional embodiments, two outer substrates 111 are provided on both sides of the support 11, and an installation space is formed between the two outer substrates 111. The rotating frame 12, the first pressure roller 14, the second pressure roller 15, and the guide roller 16 are arranged in the installation space. A drive shaft 121 is provided on the side of the rotating frame 12. The drive shaft 121 passes through the outer substrate 111 and extends to the side of the outer substrate 111 away from the installation space. The commutation drive motor 131 is mounted on the outer substrate 111 and located in the installation space. The output shaft of the commutation drive motor 131 is connected to the drive shaft 121 through a drive belt module 132, which is located on the side of the outer substrate 111 away from the installation space. The transmission structure is arranged on the outside of the outer substrate 111 to avoid affecting the feeding of the electrode sheet. Moreover, since the commutation drive motor 131 is hidden in the installation space, the large commutation drive motor 131 is prevented from colliding with other structures.

[0046] The principle and structure of the transmission belt module 132 are well known to those skilled in the art and will not be described in detail here.

[0047] In some optional embodiments, the reversing drive module 13 includes two reversing drive motors 131, which are respectively mounted on two outer base plates 111. A drive shaft 121 is provided on both sides of the rotating frame 12. The output shaft of the reversing drive motor 131 is connected to the drive shaft 121 through a drive belt module 132. The rotating frame 12 is moved by the two reversing drive motors 131, which helps to improve the stability of the rotating frame 12. Moreover, when the first pressure roller 14, the second pressure roller 15 and the guide roller 16 are relatively long, the rotating frame 12 also needs to be designed with a correspondingly longer length. The rotation of the rotating frame 12 by the two reversing drive motors 131 helps to improve the accuracy and stability of the movement of the rotating frame 12.

[0048] The specific structure of the lifting drive assembly 20 can be designed according to actual needs. For example, in some optional embodiments, the lifting drive assembly 20 includes several lifting guide racks 21, several transmission gears 22, and a lifting drive motor 23. The lifting drive motor 23 is mounted on the bracket 11, and its output shaft is driven by the transmission gears 22. The lifting guide racks 21 are located on the side of the bracket 11 and mesh with the transmission gears 22. The lifting drive motor 23 drives the transmission gears 22 to rotate, causing them to move along the lifting guide racks 21. This, in turn, causes the lifting drive motor 23 and the bracket 11 to rise and fall together along the lifting guide racks 21. The lifting guide racks 21 and transmission gears 22 help improve the accuracy of the bracket 11's movement, allowing the first pressure roller 14 or the second pressure roller 15 to more stably press the electrode sheet onto the winding drum, thus improving the success rate of winding changes. Preferably, the lifting drive motor 23 is a geared motor, which is beneficial for achieving precise lifting.

[0049] Of course, the specific structure of the lifting drive assembly 20 can be designed according to actual needs. For example, the lifting drive assembly 20 can be a lead screw drive assembly, a rotary motor translation drive assembly, a belt translation drive assembly, a cylinder translation drive assembly, or a linear motor translation drive assembly.

[0050] In some optional embodiments, the lifting drive assembly 20 further includes a plurality of lifting guide rails 24, with the bracket 11 slidingly engaged with the lifting guide rails 24. The lifting guide rails 24 improve the movement stability of the bracket 11. In this embodiment, the lifting guide rails 24 are arranged on the side of the lifting guide rack 21 to prevent the bracket 11 from wobbling relative to the lifting guide rack 21, thereby improving the stability of the transmission.

[0051] Please see Figure 7 The aforementioned lithium battery electrode changing mechanism can be applied to a lithium battery electrode winding device, which includes: a lithium battery electrode changing mechanism as described above.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery pole piece roll changing mechanism, characterized in that, include: A reversing roller assembly includes a support, a rotating frame, a reversing drive module, a first pressure roller, a second pressure roller, and multiple guide rollers. The rotating frame is rotatably mounted on the support, and the reversing drive module is drivenly connected to the rotating frame. The first pressure roller and the second pressure roller are arranged side by side on the rotating frame and are rotatably engaged with the rotating frame. The multiple guide rollers are rotatably mounted on the rotating frame and located between the first pressure roller and the second pressure roller, wherein a material passage space is formed between the multiple guide rollers for material to pass through. A lifting drive assembly is provided, which is driven to the bracket, and the bracket is raised and lowered under the drive of the lifting drive assembly.

2. The lithium battery pole piece roll changing mechanism according to claim 1, characterized in that: The plurality of feed rollers includes two first feed rollers and two second feed rollers, the feed space being formed between the two first feed rollers and the two second feed rollers, the two first feed rollers being located on the side of the feed space facing the first pressure roller, and the two second feed rollers being located on the side of the feed space facing the second pressure roller.

3. The lithium battery pole piece roll changing mechanism of claim 2, wherein: Two first guide rollers are arranged sequentially in a direction perpendicular to the first pressure roller to the second pressure roller, and the distance between the two first guide rollers on the side away from each other is greater than the diameter of the first pressure roller. Two second guide rollers are arranged sequentially in a direction perpendicular to the first pressure roller to the second pressure roller, and the distance between the two second guide rollers on the side away from each other is greater than the diameter of the second pressure roller.

4. The lithium battery electrode changing mechanism according to claim 1, characterized in that: The outer circumferential surfaces of the first and second pressure rollers are provided with pressure-pressing soft rubber.

5. A lithium battery electrode changing mechanism according to any one of claims 1 to 4, characterized in that: The reversing drive module includes a reversing drive motor, which is drivenly connected to the rotating frame.

6. A lithium battery electrode changing mechanism according to claim 5, characterized in that: Two outer base plates are provided on both sides of the bracket, and an installation space is formed between the two outer base plates. The rotating frame, the first pressure roller, the second pressure roller and the guide roller are arranged in the installation space. A drive shaft is provided on the side of the rotating frame. The drive shaft passes through the outer base plate and extends to the side of the outer base plate away from the installation space. The reversing drive motor is mounted on the outer base plate and located in the installation space. The output shaft of the reversing drive motor is connected to the drive shaft through a drive belt module. The drive belt module is arranged on the side of the outer base plate away from the installation space.

7. A lithium battery electrode changing mechanism according to claim 6, characterized in that: The reversing drive module includes two reversing drive motors, which are respectively mounted on two outer base plates. A drive shaft is provided on each side of the rotating frame, and the output shaft of the reversing drive motor is connected to the drive shaft through the drive belt module.

8. A lithium battery electrode changing mechanism according to any one of claims 1 to 4, characterized in that: The lifting drive assembly includes several lifting guide racks, several transmission gears, and a lifting drive motor. The lifting drive motor is mounted on the bracket, and its output shaft is driven by the transmission gears. The lifting guide racks are located on the side of the bracket and mesh with the transmission gears.

9. A lithium battery electrode changing mechanism according to claim 8, characterized in that: The lifting drive assembly also includes several lifting guide rails, and the bracket slides in cooperation with the lifting guide rails.

10. A lithium battery electrode winding device, characterized in that, include: A lithium battery electrode changing mechanism as described in any one of claims 1 to 9.

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