Stirring paddle

Abstract

The utility model belongs to the field of material stirring, and particularly relates to a stirring paddle. The stirring paddle comprises a rotating shaft, a stirring disc and a propeller blade, the rotating shaft is provided with a first end and a second end opposite to the first end, the stirring disc comprises a disc body connected with the first end and a plurality of stirring spokes connected to the edge of the disc body, the stirring spokes are arranged at intervals in the circumferential direction of the disc body, and one end of the propeller blade is connected to the first end; the other end of the propeller blade is spirally wound around the circumferential direction of the rotating shaft and extends to and is connected to the second end. According to the utility model, the phenomenon that materials are layered in the vertical direction can be avoided, so that high-density and low-density materials are effectively mixed in the axial direction of the rotating shaft, and the overall uniformity of dry-method material mixing is improved.

Description

Technical Field

[0001] This utility model belongs to the field of material mixing, and in particular relates to a mixing paddle. Background Technology

[0002] In the production of lithium batteries, mixing and stirring are among the key steps that determine the battery's energy density and consistency. Its essential task is to uniformly mix powders with different physical properties (such as density, particle size, and surface properties) of active materials, conductive agents, and binders, ensuring their structural and performance consistency during subsequent processes such as slurry preparation, coating, and electrode compaction. Improper mixing can not only lead to poor battery performance but may also introduce defects into the finished product, reducing safety and consistency.

[0003] In actual dry mixing processes, there is a common problem of large differences in material density. For example, the density of common active materials is around 3.55 g / cm³, while the density of conductive agents ranges from 0.1 to 0.5 g / cm³, and the density of binders is in the middle, ranging from 1.5 to 2 g / cm³.

[0004] However, when using a conventional planar agitator for mixing, it can usually only provide horizontal shear force, which is difficult to break up the vertical stratification effect caused by density differences. This manifests as the active material with higher density tending to sink, while the conductive agent floats, and the binder is unevenly distributed, resulting in uneven spatial distribution of different particles in the mixture. Utility Model Content

[0005] The purpose of this application is to provide a stirring paddle that aims to solve the problem of how to improve the uniformity of mixing.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A stirring paddle is provided, comprising: a rotating shaft, a stirring disk, and a propeller blade. The rotating shaft has a first end and a second end disposed opposite to the first end. The stirring disk includes a disk body connected to the first end and stirring spokes connected to the edge of the disk body. A plurality of stirring spokes are arranged at intervals along the circumference of the disk body. One end of the propeller blade is connected to the first end, and the other end of the propeller blade is spirally wound around the rotating shaft and extends to and connects to the second end.

[0008] In some embodiments, two propeller blades are arranged circumferentially along the rotation axis; the two propeller blades are arranged in a double helix structure.

[0009] In some embodiments, the stirring paddle further includes a first positioning rod connected to the first end and spaced apart from the stirring plate, and a second positioning rod connected to the second end, wherein one end of each of the two propeller blades is connected to both ends of the first positioning rod, and the other end of each of the two propeller blades is connected to both ends of the second positioning rod.

[0010] In some embodiments, three propeller blades are arranged circumferentially along the axis of rotation.

[0011] In some embodiments, the stirring paddle further includes a first positioning ring connected to the first end and arranged at a distance from the stirring plate, and a second positioning ring connected to the second end, wherein one end of each propeller blade is connected to the first positioning ring, and the other end of each propeller blade is connected to the second positioning ring.

[0012] In some embodiments, the connection positions of each propeller blade on the first positioning ring are arranged with equal arcs, and / or the connection positions of each propeller blade on the second positioning ring are arranged with equal arcs.

[0013] In some embodiments, multiple stirring discs are arranged at axial intervals along the rotation axis.

[0014] In some embodiments, the agitator further includes a stirring column connected to the disc body, the stirring column being located on the surface of the disc body facing away from the propeller blade, and multiple stirring columns being arranged at intervals.

[0015] In some embodiments, the mixing disc further includes mixing blocks, with the mixing blocks arranged between any two adjacent mixing spokes.

[0016] In some embodiments, the end face of the stirring block is exposed relative to the free end of the stirring spokes.

[0017] The beneficial effects of this application are as follows: by simultaneously setting a combination structure of a mixing disc and a propeller blade on a rotating shaft, the mixing spokes on the mixing disc can provide horizontal shearing force to horizontally mix the material, while the propeller blades are wound along the axial direction of the rotating shaft from the first end to the second end, which can drive the material to tumble up and down during rotation, so that the material with higher density can rise, thereby avoiding the phenomenon of material stratification in the vertical direction, and enabling high-density and low-density materials to be effectively mixed in the axial direction of the rotating shaft, thus improving the overall uniformity of dry mixing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the stirring paddle provided in the embodiments of this application;

[0020] Figure 2 yes Figure 1 A top-down view of the agitator blade;

[0021] Figure 3 yes Figure 2 A magnified view of a portion at point A;

[0022] Figure 4 This is a three-dimensional structural diagram of the stirring paddle provided in another embodiment of this application.

[0023] The following are the labeling elements in the figure:

[0024] 110. Stirring paddle; 10. Rotating shaft; 11. First end; 12. Second end; 20. Propeller blade; 21. First positioning rod; 22. Second positioning rod; 30. Stirring disc; 31. Disc body; 32. Stirring spokes; 33. Stirring block; 34. Stirring column; 331. Striking part; 332. Receiving groove; 41. First positioning ring; 411. First positioning spokes; 42. Second positioning ring; 422. Second positioning spokes. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. 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 technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0027] Please see Figures 1 to 3 This application provides a stirring paddle 110 and a dry mixer having the same. The stirring paddle 110 is used to stir materials, which include active materials, conductive agents and binders, and the active materials, conductive agents and binders have different densities.

[0028] Please see Figures 1 to 3 The stirring paddle 110 includes a rotating shaft 10, a stirring plate 30, and a propeller blade 20. It is understood that during use, the axial direction of the rotating shaft 10 is generally arranged vertically, and the rotating shaft 10 is connected to an external drive structure, which can be a servo motor. The servo motor can drive the rotating shaft 10 to rotate. The rotating shaft 10 has a first end 11 and a second end 12 opposite to the first end 11. During use, the second end 12 is located above the first end 11.

[0029] Please see Figures 1 to 3 The stirring disc 30 includes a disc body 31 connected to the first end 11 and stirring spokes 32 connected to the edge of the disc body 31. Multiple stirring spokes 32 are arranged radially along the circumference of the disc body 31. In this embodiment, the stirring spokes 32 are connected to the side surface of the disc body 31, and the disc body 31 is generally a flat cylinder. The rotating shaft 10 drives the disc body 31 to rotate, so that the multiple stirring spokes 32 located at the edge of the disc body 31 can stir and mix the material with a higher density at the bottom.

[0030] Please see Figures 1 to 3One end of the propeller blade 20 is connected to the first end 11, and the other end of the propeller blade 20 is spirally wound around the rotating shaft 10 and extends to and connects to the second end 12. It is understood that the propeller blade 20 has a certain width, which can be 40mm, 50mm, 70mm, or 80mm; no limitation is made here, and it can be selected according to actual conditions. The propeller blade 20 is arranged spirally around the rotating shaft 10 and rotates synchronously with the rotating shaft 10. That is, during the rotation of the rotating shaft 10, it can drive the propeller blade 20 to rotate synchronously. Since the two ends of the propeller blade 20 extend to the first end 11 and the second end 12 respectively, the material with a higher density at the first end 11 can be stirred by the propeller blade 20 and made to rise along the blade surface of the propeller blade 20 to the second end 12, thereby enabling materials of different densities to be uniformly mixed.

[0031] The stirring paddle 110 provided in this application embodiment has a combined structure of a stirring disc 30 and a propeller blade 20 simultaneously arranged on a rotating shaft 10. The stirring spokes 32 on the stirring disc 30 can provide horizontal shearing force to horizontally stir the material. The propeller blade 20 is wound along the axial direction of the rotating shaft 10, passing through the first end 11 to the second end 12. During the rotation, it can drive the material to tumble up and down, which can make the material with higher density at the bottom rise. This can avoid the phenomenon of material stratification in the vertical direction, so that high-density and low-density materials can be effectively mixed in the axial direction of the rotating shaft 10, and improve the overall uniformity of dry mixing.

[0032] Please see Figures 1 to 3 Optionally, the cross-sectional shape of the disc body 31 is circular, the rotating shaft 10 is connected to the center of the disc body 31, and the stirring spokes 32 are arranged at equal intervals along the circumference of the disc body 31.

[0033] Optionally, the length of the stirring spokes 32 can range from 2 to 50 mm, such as 2 mm, 7 mm, 11 mm, 14 mm, 19 mm, 23 mm, 29 mm, 33 mm, 36 mm, 42 mm, 48 mm or 50 mm. There is no restriction here, and it can be selected according to the actual situation.

[0034] Please see Figures 1 to 3 In some embodiments, two propeller blades 20 are arranged circumferentially along the rotation axis 10. The two propeller blades 20 can enhance the axial disturbance capability of the agitator 110, enabling a stronger vertical circulating flow field to be provided to the material, and enhancing the uniformity of overall mixing of powders with density differences such as conductive agents, active substances, and binders.

[0035] Please see Figures 1 to 3 In some embodiments, the two propeller blades 20 are arranged in a double helix structure.

[0036] Optionally, the two propeller blades 20 arranged in a double helix structure can form a complementary bidirectional helical propulsion flow field, which can generate more thorough convection and tumbling mixing of materials, avoid the formation of dead zones in certain areas, make the overall mixing coverage area larger, and improve the uniformity of material mixing.

[0037] Please see Figures 1 to 3 In some embodiments, the stirring paddle 110 further includes a first positioning rod 21 connected to the first end 11 and spaced apart from the stirring plate 30, and a second positioning rod 22 connected to the second end 12. One end of each of the two propeller blades 20 is connected to both ends of the first positioning rod 21, and the other end of each of the two propeller blades 20 is connected to both ends of the second positioning rod 22.

[0038] Optionally, a first positioning hole and a second positioning hole are respectively provided on the radial side of the rotating shaft 10. The first positioning rod 21 and the second positioning rod 22 pass through the first positioning hole and the second positioning hole respectively. The starting and ending ends of the two propeller blades 20 can be fixed by the first positioning rod 21 and the second positioning rod 22, which can effectively control the attitude stability and helical angle of the two propeller blades, improve the structural rigidity and mixing consistency during the mixing process, avoid deformation or vibration of the propeller blades 20 under high viscosity or high load conditions, improve the service life of the propeller blades 20, and improve the reliability of mixing.

[0039] Optionally, the first positioning rod 21 and the second positioning rod 22 are parallel and of the same length. The two ends of the first positioning rod 21 or the second positioning rod 22 are symmetrical about the rotation axis 10, so that the two propeller blades 20 are symmetrically distributed in space, which can improve the rotational stability of the stirring paddle 110.

[0040] Please see Figure 4 In some embodiments, three propeller blades 20 are arranged circumferentially along the rotation axis 10.

[0041] Optionally, three propeller blades 20 are used and distributed circumferentially along the rotation axis 10, which effectively improves the spiral turning ability of the stirring paddle 110, and forms multiple axial circulating flow zones during the stirring process, which helps to increase the convection frequency and turning times of the upper and lower layers of materials, and improve the uniformity of material mixing.

[0042] Please see Figure 4 In some embodiments, the stirring paddle 110 further includes a first positioning ring 41 connected to the first end 11 and spaced apart from the stirring plate 30, and a second positioning ring 42 connected to the second end 12. One end of each propeller blade 20 is connected to the first positioning ring 41, and the other end of each propeller blade 20 is connected to the second positioning ring 42.

[0043] Please see Figure 4 Optionally, the agitator 110 also includes a plurality of first positioning spokes 411 and a plurality of second positioning spokes. The first end 11 and the second end 12 of the rotating shaft 10 are located in the first positioning ring 41 and the second positioning ring 42, respectively. The plurality of first positioning spokes 411 are used to connect the first positioning ring 41 and the first end 11, and the plurality of second positioning spokes 422 are used to connect the second end 12 and the second positioning ring 42. The first positioning ring 41 and the second positioning ring 42 are respectively connected to the beginning and end of the three sets of propeller blades 20, which not only makes the structure more stable, but also allows for precise control of the position and angle of the three propeller blades 20, improving the structural symmetry and uniform distribution of stirring force, thereby avoiding vibration caused by uneven wear on one side or imbalance of the agitator 110, and improving the service life of the agitator 110 and the uniformity of mixing.

[0044] Please see Figure 4 In some embodiments, the connection positions of each propeller blade 20 on the first positioning ring 41 are arranged with equal arcs, and / or the connection positions of each propeller blade 20 on the second positioning ring 42 are arranged with equal arcs.

[0045] Optionally, arranging the connection positions of each propeller blade 20 on the first positioning ring 41 with equal arcs, and arranging the connection positions of each propeller blade 20 on the second positioning ring 42 with equal arcs, can ensure that the three propeller blades 20 generate uniform axial flow and shear force distribution during the rotation of the agitator 110, so that the agitator 110 maintains balance and stability during the rotation, reduces turbulence dead zone and overmixing zone, and improves the efficiency of the agitation process.

[0046] Optionally, the pitch range of the propeller blade 20 is 40~300mm, such as 40mm, 42mm, 57mm, 68mm, 95mm, 123mm, 156mm, 187mm, 209mm, 247mm, 289mm or 300mm. There is no restriction here, and it can be selected according to the actual situation.

[0047] Please see Figure 4 In some embodiments, multiple stirring discs 30 are arranged at intervals along the axial direction of the rotation axis 10.

[0048] Optionally, multiple mixing discs 30 can increase multiple planar shearing zones to achieve layered shearing of materials at different heights, forming a synergistic mixing effect with the axial convection generated by the propeller blades 20, thereby improving the dispersion efficiency of powders with different particle sizes and densities, avoiding agglomeration and segregation, and improving the uniformity of material mixing. Furthermore, the multiple mixing discs 30 are arranged at intervals along the axial direction of the rotation axis 10, which can make the center of gravity of the mixing paddle 110 located in the middle position of the rotation axis 10, improving the stability of the rotation process of the mixing paddle 110.

[0049] Please see Figure 4 Optionally, in this embodiment, three mixing discs 30 are arranged at intervals along the axial direction of the rotation shaft 10, and the inner diameter of the mixing disc 30 at the bottom is larger than the inner diameter of the other two mixing discs 30, so that the mixing disc 30 at the bottom can effectively stir the material at the bottom, while the two mixing discs 30 at the top play an auxiliary stirring role, thus saving kinetic energy and energy consumption.

[0050] Please see Figure 1 and Figure 4 In some embodiments, the stirring paddle 110 further includes stirring columns 34 connected to the disc body 31. The stirring columns 34 are located on the surface of the disc body 31 facing away from the propeller blade 20, and multiple columns are arranged at intervals.

[0051] Optionally, in actual use, the stirring column 34 is located on the lower surface of the disc body 31, and the length direction of the stirring column 34 is arranged vertically. During the rotation of multiple stirring columns 34, the material located below the disc body 31 can be stirred and disturbed, causing the material below to rise to the propeller blade 20, and then rise and mix along the propeller blade 20. Multiple stirring columns 34 can enhance the local disturbance and shear strength, avoid static accumulation or material agglomeration of materials at the edge and middle area of ​​the mixing tank, and improve the uniformity of mixing.

[0052] Optionally, the length of the stirring column 34 can range from 0 to 40 mm, such as 3 mm, 7 mm, 12 mm, 16 mm, 19 mm, 22 mm, 27 mm, 31 mm, 35 mm, 39 mm or 40 mm. There is no restriction here, and it can be selected according to the actual situation.

[0053] Please see Figures 1 to 3 In some embodiments, the mixing disc 30 further includes mixing blocks 33, with each mixing block 33 arranged between any two adjacent mixing spokes 32, and along the rotation direction of the mixing disc 30, such as... Figure 1 or Figure 4 As indicated by the arrow, the stirring block 33 is located on the stirring spokes 32 behind it.

[0054] Optionally, the stirring block 33 is located at the free end of the stirring spoke 32, which can increase the contact area between the stirring disc 30 and the material, improve the uniformity of mixing, and the stirring block 33 protruding from the free end of the stirring spoke 32 has a large linear velocity, which can effectively stir materials with large particle size or clumps of materials, and can break materials with large particle size into materials with smaller particle size.

[0055] Please see Figures 1 to 3In some embodiments, the stirring block 33 is rectangular, with the end face of the stirring block 33 exposed relative to the free end of the stirring spoke 32. A sharp striking part 331 is formed between two perpendicularly intersecting surfaces of the stirring block 33. The three striking parts 331 are labeled 3311, 3312 and 3313, respectively. The striking parts 3311 and 3312 can break up clumps of material or large-particle material.

[0056] A receiving groove 332 is formed between the end face of the striking part 3313 and the free end of the stirring spoke 32, which, during rotation, ... Figure 3 As indicated by the arrow, the material in front of the receiving groove 332 is driven away by the stirring block 33, thereby easily forming a low-density vortex effect in the receiving groove 332. Under the action of a negative pressure-like effect, the clumps of material or large-diameter material around the stirring block 33 easily flow into the receiving groove 332 and are broken up by the striking part 3313. This makes it easier for the stirring block 33 to contact the clumps of material or the large-diameter material. Each striking part 331 is located at the free end of the stirring spoke 32 and has a large linear velocity. The sharp striking part has a small contact area with the material, thereby applying a large striking force to the material, breaking up the clumps of material and crushing the large-diameter polymer binders, such as PTFE.

[0057] This utility model also proposes a dry mixing machine, which includes a stirring paddle 110. The specific structure of the stirring paddle 110 is as described in the above embodiments. Since this dry mixing machine adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0058] In some embodiments, the dry mixer further includes a drive structure and a mixing tank, wherein the mixing paddle 110 is located in the mixing tank and the drive structure is used to drive the mixing paddle 110 to rotate.

[0059] By integrating the agitator 110 into the dry mixing machine and combining it with the drive structure and mixing tank to form a systematic mixing device, the mixing uniformity of multi-component, high-density difference materials in the dry mixing process of lithium batteries can be improved. This effectively solves the problems of uneven mixing and severe stratification caused by the traditional dry mixing agitator 110, and provides a reliable pretreatment guarantee for subsequent slurry preparation and electrode performance improvement.

[0060] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A stirring paddle, characterized in that, include: The rotating shaft comprises a rotating shaft, a stirring disc, and a propeller blade. The rotating shaft has a first end and a second end opposite to the first end. The stirring disc includes a disc body connected to the first end and stirring spokes connected to the edge of the disc body. Multiple stirring spokes are arranged at intervals along the circumference of the disc body. One end of the propeller blade is connected to the first end, and the other end of the propeller blade is spirally wound around the rotating shaft and extends to and connects to the second end.

2. The paddle of claim 1 wherein: Two propeller blades are arranged circumferentially along the axis of rotation; the two propeller blades are arranged in a double helix structure.

3. The paddle of claim 2, wherein: The stirring paddle further includes a first positioning rod connected to the first end and spaced apart from the stirring plate, and a second positioning rod connected to the second end. One end of each of the two propeller blades is connected to both ends of the first positioning rod, and the other end of each of the two propeller blades is connected to both ends of the second positioning rod.

4. The paddle of claim 1 wherein: The propeller blades are arranged in three circumferentially along the axis of rotation.

5. The paddle of claim 4 wherein: The stirring paddle further includes a first positioning ring connected to the first end and spaced apart from the stirring plate, and a second positioning ring connected to the second end. One end of each propeller blade is connected to the first positioning ring, and the other end of each propeller blade is connected to the second positioning ring.

6. The stirring paddle as described in claim 5, characterized in that: The connection positions of each propeller blade on the first positioning ring are arranged with equal arcs, and / or the connection positions of each propeller blade on the second positioning ring are arranged with equal arcs.

7. A paddle according to any one of claims 4 to 6, wherein: Multiple stirring discs are arranged at intervals along the axial direction of the rotation axis.

8. The impeller of any one of claims 1 to 6, wherein: The stirring paddle also includes stirring columns connected to the disc body. The stirring columns are located on the surface of the disc body facing away from the propeller blades, and multiple stirring columns are arranged at intervals.

9. The stirring impeller as described in any one of claims 1-6, characterized in that: The mixing plate also includes mixing blocks, and the mixing blocks are arranged between any two adjacent mixing spokes.

10. The paddle of claim 9, wherein: The end face of the stirring block is exposed relative to the free end of the stirring spoke.

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