Slurry stirring device and battery production line

Abstract

The utility model provides a slurry stirring device and a battery production line. The slurry stirring device comprises a charging barrel and a dispersing shaft assembly, wherein the charging barrel comprises a barrel body for accommodating slurry and a liquid sealing plate for sealing the barrel body; the dispersing shaft assembly comprises a dispersing shaft, a base, a bearing and a protection disc, the base is fixedly arranged on the lower side of the liquid sealing plate, the dispersing shaft is rotatably arranged on the liquid sealing plate through the bearing, the dispersing shaft penetrates through the base and extends into slurry of the charging barrel, and the protection disc is located below the base and fixedly arranged on the dispersing shaft to rotate along with the dispersing shaft; the protection disc comprises a disc body which is arranged at an interval with the base in the axial direction, and a material throwing gap is formed between the upper surface of the disc body and the lower surface of the base. According to the technical scheme, the protection performance of the slurry stirring device is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and relates to a slurry stirring device and a battery production line. Background Art

[0002] With the rapid development of new energy, batteries are widely used. In the production process of batteries, a stirring device is required to stir the slurry during the preparation process of the electrode slurry. If the slurry invades the inside of the stirring device, it will affect the working performance of the stirring device. Summary of the Utility Model

[0003] In view of the above problems, this application provides a slurry stirring device and a battery production line to improve the protection performance.

[0004] In the first aspect of this application, a slurry stirring device is provided, which includes a material cylinder and a dispersion shaft assembly. The material cylinder includes a cylinder body for accommodating the slurry and a liquid seal plate for closing the cylinder body; the dispersion shaft assembly includes a dispersion shaft, a base, a bearing and a protection disc. The base is fixedly arranged on the lower side of the liquid seal plate. The dispersion shaft is rotatably arranged on the liquid seal plate through the bearing, and the dispersion shaft passes through the base and extends into the slurry in the material cylinder. The protection disc is located below the base and is fixedly arranged on the dispersion shaft to rotate with the dispersion shaft. The protection disc includes a disc body spaced from the base in the axial direction. A throwing gap is formed between the upper surface of the disc body and the lower surface of the base.

[0005] In the technical solution of the embodiment of this application, the protection disc includes a disc body spaced from the base in the axial direction. A throwing gap is formed between the upper surface of the disc body and the lower surface of the base. In this way, even if part of the slurry enters the throwing gap between the disc body and the base during the stirring process in the slurry stirring device of the embodiment of this application, due to the disc body rotating synchronously with the dispersion shaft, the part of the slurry entering the throwing gap can also be thrown out under the action of centrifugal force, thereby improving the protection performance.

[0006] The height of the throwing gap in the axial direction ranges from 2 mm ≤ d ≤ 7 mm. Setting the height of the throwing gap within the above range can effectively prevent large-particle slurry from entering the gap. Even if part of the slurry enters the gap, it is easy to be thrown out under the action of centrifugal force.

[0007] In some embodiments, the upper surface of the disc body includes a smooth surface. The upper surface of the disc body of the slurry stirring device in the embodiment of this application includes a smooth surface, which can prevent the slurry from being blocked by grooves or protrusions and unable to be thrown out under the action of centrifugal force, thus further optimizing the protection performance.

[0008] In some embodiments, the protective disc further includes a connecting sleeve which is arranged below the disc body and connected to the dispersion shaft. The technical solution of the embodiments of the present application is to provide a connecting sleeve connected to the dispersion shaft on the lower side of the disc body. The connecting sleeve extends axially and is sleeved outside the dispersion shaft, so that the connection between the protective disc and the dispersion shaft is tighter, improving the connection stability between the protective disc and the dispersion shaft, and further enhancing the stability of the disc body rotating with the dispersion shaft. Therefore, the working reliability of the slurry stirring device of the embodiments of the present application can be improved.

[0009] In some embodiments, one end of the connecting sleeve away from the disc body is connected to the dispersion shaft. The protective disc further includes an annular protrusion arranged on the radial inner side of the disc body and protruding towards the base side relative to the disc body. The technical solution of the embodiments of the present application is to provide an annular protrusion on the side of the disc body close to the base. The annular protrusion circumferentially wraps around the radial outside of the dispersion shaft, thereby preventing the protective disc from detaching during high-speed rotation and improving the working reliability of the slurry stirring device.

[0010] In some embodiments, the dispersion shaft assembly further includes a protective sleeve sleeved outside the protective disc, and the protective sleeve is connected to the base. The technical solution of the embodiments of the present application is to provide a protective sleeve to form a first layer of blockage for the slurry, that is, to provide a first layer of protection for the bearing, preventing the slurry from entering the bearing through the gap between the protective disc and the base, and further improving the anti-corrosion effect.

[0011] In some embodiments, the protective sleeve is made of waterproof material.

[0012] In some embodiments, the dispersion shaft assembly further includes a bearing seat and at least two sealing rings stacked in the axial direction. The bearing seat is arranged above the liquid seal plate and the bearing is installed in the bearing seat. At least two sealing rings are arranged below the liquid seal plate and installed in the base. The arrangement of at least two sealing rings plays a multiple protection role for the rolling elements in the bearing.

[0013] In some embodiments, the material of the lowermost sealing ring among the at least two sealing rings is silica gel, and the material of the uppermost sealing ring is fluororubber. This can form a good protection for the bearing structure, and the grease in the bearing will not flow into the slurry, causing pollution and scrapping.

[0014] In some embodiments, the slurry stirring device further includes a driving mechanism arranged above the liquid seal plate, and the slurry stirring device includes two dispersion shaft assemblies, and the driving mechanism commonly drives the dispersion shafts of the two dispersion shaft assemblies to rotate.

[0015] The second aspect of the present application provides a battery production line, including the above-mentioned slurry stirring device.

[0016] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without creative efforts.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a dispersion shaft assembly of a slurry stirring device in some embodiments of the present application.

[0019] Figure 2 is Figure 1 The front view structural schematic diagram of the dispersion shaft assembly shown.

[0020] Figure 3 is Figure 1 The sectional structural schematic diagram of the dispersion shaft assembly shown.

[0021] Figure 4 is Figure 3 The partial enlarged structural schematic diagram of part M in.

[0022] In the drawings, the drawings are not drawn to actual scale.

[0023] 10. Dispersion shaft assembly.

[0024] 11. Dispersion shaft.

[0025] 12. Bearing.

[0026] 13. Bearing seat.

[0027] 14. Base.

[0028] 15. Sealing ring.

[0029] 16. Protection disc; 161. Disc body; 162. Connecting sleeve; 163. Annular protrusion.

[0030] 17. Protection sleeve.

[0031] 18. Upper cover.

[0032] 19. Driving wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically and clearly defined.

[0035] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also constantly increasing.

[0041] In the production process of batteries, the preparation of the positive and negative electrode slurries of the batteries requires the use of a slurry stirring device to stir and disperse the slurry to improve the dispersibility and uniformity of the slurry. Specifically, when preparing, the powder materials, various additives, and solvents are added into the barrel, and the slurry stirring device is used for turning, shearing, kneading, and dispersing, so that the powder materials and the solvent are fully fused together to form a slurry mixed liquid.

[0042] In the process of preparing the positive electrode slurry, one of the solvent additives added is NMP (N-methylpyrrolidone), which is corrosive. The dispersion shaft of the slurry stirring device extends into the barrel and rotates to cut and refine the slurry. Since the rotation speed of the dispersion shaft is very fast and the dispersion shaft is in direct contact with the slurry, a sealing structure needs to be set to prevent the slurry from invading the inside of the dispersion shaft and affecting the stirring performance.

[0043] In the related art, the slurry stirring device includes a protective disk, and a sealing structure is provided between the protective disk and the base to prevent the slurry from invading the inside of the bearing. The present application found in the research process that setting the sealing structure can indeed play a role in preventing the slurry from invading the inside of the bearing to a certain extent. However, on the other hand, since the protective disk is rotatable relative to the base, there is a certain fitting gap between the sealing structure and the base. If the slurry invades the inside through the fitting gap between the sealing structure and the base, due to the existence of the sealing structure, the slurry that enters the inside is not easy to break away and stays inside all the time, and it is very easy to corrode structures such as the bearing.

[0044] In view of the above findings, the present application proposes to cancel the sealing structure provided between the protective plate and the base, and to form a material throwing gap between the upper surface of the protective plate and the lower surface of the base, so that even if part of the slurry enters the material throwing gap between the protective plate and the base during the stirring process, since the protective plate rotates synchronously with the dispersion shaft, part of the slurry entering the material throwing gap can also be thrown out through the material throwing gap under the action of centrifugal force, thereby avoiding the problem of slurry retention corrosion and improving the protection performance.

[0045] Reference below Figures 1 to 4 The structure and working process of the slurry stirring device in some embodiments of the present application are described in detail.

[0046] References Figures 1 to 4 , some embodiments of the present application provide a slurry stirring device, including a barrel (not shown in the figure) and a dispersion shaft assembly 10. The barrel includes a cylinder for accommodating slurry and a liquid sealing plate for sealing the barrel. The dispersion shaft assembly 10 includes a dispersion shaft 11, a base 14, a bearing 12 and a protective plate 16. The base 14 is fixedly arranged on the lower side of the liquid sealing plate. The dispersion shaft 11 is rotatably arranged on the liquid sealing plate through the bearing 12. And the dispersion shaft 11 passes through the base 14 and extends into the slurry in the barrel. The protective plate 16 is located below the base 14 and is fixedly arranged on the dispersion shaft 11 to rotate with the dispersion shaft 11. The protective plate 16 includes a disc body 161 spaced apart from the base 14 in the axial direction, and a material throwing gap A is formed between the upper surface of the disc body 161 and the lower surface of the base 14.

[0047] References Figure 3 and Figure 4 , the dispersion shaft assembly 10 of the slurry stirring device of some embodiments of the present application includes a dispersion shaft 11. The dispersion shaft 11 passes through the liquid sealing plate at the top of the barrel to extend into the barrel. In the axial direction, a part of the dispersion shaft 11 is located outside the barrel, and a part is located inside the barrel. The dispersion shaft 11 is provided with a dispersion disk immersed in the slurry in the barrel. The dispersion disk rotates with the dispersion shaft 11 to generate strong turbulence and shear force at high speed, cutting and crushing large particles into smaller particles.

[0048] The dispersion shaft 11 is rotatably arranged relative to the liquid sealing plate. Specifically, as Figure 4 As shown in , a bearing seat 13 is provided on the upper side of the liquid seal plate, and the bearing 12 is installed in the bearing seat 13. The outer ring of the bearing 12 is fixedly connected to the bearing seat 13, and the dispersion shaft 11 is passed through the inner ring of the bearing seat 13 and has an interference fit with the inner ring, thereby realizing the rotation connection of the dispersion shaft 11 relative to the liquid seal plate. In order to achieve the sealing of the lubricating oil of the bearing 12, as shown in Figure 4 As shown in FIG. 1 , a sealing ring 15 is provided on the lower side of the bearing 12. The sealing ring 15 is fixedly arranged on the base 14, and the sealing ring 15 forms an oil seal for the bearing 12. ​​

[0049] As Figure 4 shown, the protective disk 16 of some embodiments of the present application is located below the base 14 and fixedly arranged on the dispersion shaft 11 to rotate with the dispersion shaft 11. The protective disk 16 includes a disk body 161 spaced from the base 14 in the axial direction. A material throwing gap A is formed between the upper surface of the disk body 161 and the lower surface of the base 14. As Figure 4 shown, no sealing structure is provided between the upper surface of the disk body 161 and the lower surface of the base 14, but it is an open setting to form the material throwing gap. In this way, since the disk body 161 rotates synchronously with the dispersion shaft 11, the slurry entering the material throwing gap will be thrown outwards under the action of centrifugal force.

[0050] In the technical solution of the embodiments of the present application, the protective disk 16 includes a disk body 161 spaced from the base 14 in the axial direction. A material throwing gap A is formed between the upper surface of the disk body 161 and the lower surface of the base 14. In this way, even if some slurry enters the material throwing gap between the disk body 161 and the base 14 during the stirring process, due to the disk body 161 rotating synchronously with the dispersion shaft, the part of the slurry entering the gap can also be thrown out through the open space of the material throwing gap under the action of centrifugal force, thereby avoiding the problem of slurry retention corrosion and improving the protection performance.

[0051] In some embodiments, the height d of the material throwing gap A in the axial direction ranges from 2 mm ≤ d ≤ 7 mm.

[0052] The height d of the material throwing gap A in the axial direction ranges from 2 mm ≤ d ≤ 7 mm, and this range is larger than the range of clearance fit between two relatively rotating components under normal circumstances, which helps the slurry to be smoothly thrown out.

[0053] Setting the material throwing gap A within the above range can not only effectively prevent large-particle slurry from entering the gap, but also make it easy for small-particle slurry to be thrown out under the action of centrifugal force when the small-particle slurry enters the gap.

[0054] In some embodiments, the upper surface of the disk body 161 includes a smooth surface. The smooth surface here means that there are no obvious grooves or protrusions on the upper surface, and it is basically a smooth surface, such as Figure 4 the plane shown or a smooth curved surface such as a conical surface not shown in the drawings. Such a setting can facilitate the slurry to be thrown outwards under the action of centrifugal force.

[0055] In some embodiments, the upper surface of the disk body 161 is configured as a plane. The plane is a horizontal plane. In other embodiments, it can also be a plane with a certain inclination. For example, an inclined plane that gradually slopes downwards from the radial inner side to the radial outer side, so that the material throwing gap forms a flared shape, which is more conducive to the slurry being thrown out.

[0056] The upper surface of the disk body 161 of the technical solution of the embodiment of the present application includes a smooth surface, which can prevent the slurry from being blocked by grooves or protrusions and unable to be thrown out under the action of centrifugal force, thereby improving the corrosion resistance.

[0057] In some embodiments, the protective disk 16 further includes a connecting sleeve 162. The connecting sleeve 162 is disposed below the disk body 161 and connected to the dispersion shaft 11.

[0058] As Figure 4 shown, the connecting sleeve 162 is sleeved outside the dispersion shaft 11 and connected to the dispersion shaft 11, so that the protective disk 16 rotates synchronously with the dispersion shaft 11.

[0059] The technical solution of the embodiment of the present application is provided with a connecting sleeve 162 connected to the dispersion shaft 11 on the lower side of the disk body 161. The connecting sleeve 162 extends axially and is sleeved outside the dispersion shaft. In this way, the connection between the protective disk 16 and the dispersion shaft 11 is made closer, the connection stability between the protective disk 16 and the dispersion shaft 11 is improved, and further the rotation stability of the disk body 161 following the dispersion shaft 11 is improved. Therefore, the working reliability of the slurry stirring device of the embodiment of the present application can be improved.

[0060] Refer to Figure 4 , in some embodiments, one end of the connecting sleeve 162 away from the disk body 161 is connected to the dispersion shaft 11. The protective disk 16 further includes an annular protrusion 163 disposed on the radially inner side of the disk body 161 and protruding toward the base 14 side relative to the disk body 161.

[0061] Refer to Figure 4 , the connecting sleeve 162 of the protective disk 16 extends in the axial direction, and the lower end of the connecting sleeve 162 is connected to the dispersion shaft 11 through a connecting member. In order to prevent the upper end of the protective disk, that is, the end away from the connecting member, from disengaging from the dispersion shaft 11 during high-speed rotation, the technical solution of the embodiment of the present application is provided with an upwardly protruding annular protrusion 163 on the upper end of the disk body 161. In this way, the annular protrusion 163 surrounds the dispersion shaft 11 in the circumferential direction, thereby preventing disengagement and further improving the working reliability of the slurry stirring device.

[0062] The technical solution of the embodiment of the present application is provided with an annular protrusion 163 on the side of the disk body 161 close to the base 14. The annular protrusion 163 wraps around the radially outer side of the dispersion shaft 11 in the circumferential direction, thereby preventing the protective disk from disengaging during high-speed rotation and improving the working reliability of the slurry stirring device.

[0063] To further improve the protection of the bearing, in some embodiments, the dispersion shaft assembly 10 further includes a protective sleeve 17 sleeved outside the protective disc 16. The protective sleeve 17 is connected to the base 14.

[0064] Reference Figures 1 to 4 , a protective sleeve 17 is sleeved outside the dispersion shaft 11. Specifically, the protective sleeve 17 is sleeved outside the protective disc 16, and is sleeved outside the protective disc 16 in both the axial direction and the radial direction, thereby achieving comprehensive protection of the protective disc 16. As Figure 4 shown, the protective sleeve 17 includes a sleeve body sleeved outside the protective disc 16 and a flange extending along the edge of the sleeve body. The flange is connected to the base 14 through a connecting member, that is, the protective sleeve 17 is fixed and immovable.

[0065] Specifically, the protective sleeve is made of corrosion-resistant materials (such as rubber, plastic or stainless steel), which can effectively resist the corrosion of the slurry.

[0066] The technical solution of the embodiment of the present application sets the protective sleeve 17 to form a first layer of barrier against the slurry, that is, to provide the first layer of protection for the bearing, preventing the slurry from entering the bearing through the gap between the protective disc and the base, and further improving the anti-corrosion effect.

[0067] In some embodiments, the protective sleeve 17 is made of a waterproof material. For example, the protective sleeve 17 is made of stainless steel. Since the protective sleeve 17 is made of a waterproof material, even if the liquid slurry adheres to the protective sleeve 17, due to its waterproof performance, the liquid in the slurry can be prevented from seeping into the interior through the waterproof sleeve.

[0068] In some embodiments, the dispersion shaft assembly 10 further includes a bearing seat 13 and at least two sealing rings 15 stacked in the axial direction. The bearing seat 13 is arranged on the upper side of the liquid sealing plate and the bearing 12 is installed in the bearing seat 13. At least two sealing rings 15 are arranged on the lower side of the liquid sealing plate and installed in the base 14.

[0069] In a specific embodiment such as Figure 4 , the dispersion shaft assembly 10 includes two stacked sealing rings 15.

[0070] The setting of at least two sealing rings 15 plays a multiple protection role for the rolling elements in the bearing 12, effectively preventing the leakage of lubricating oil and preventing the external slurry from entering. Moreover, by setting at least two stacked sealing rings, even if one sealing ring fails, the other sealing rings can still provide protection, so the reliability of the protection can be improved.

[0071] In some embodiments, the material of the lower sealing ring among at least two sealing rings is silica gel, and the material of the upper sealing ring is fluororubber.

[0072] Specifically, the sealing ring located at the upper end of the axis is made of fluororubber, while the sealing ring located at the lower end of the axis is made of silica gel. This can form good protection for the bearing structure, preventing the grease in the bearing from flowing into the slurry and causing pollution and scrapping. Moreover, in the embodiments of the present application, the sealing ring closer to the bearing is set as fluororubber. The fluororubber sealing ring is resistant to chemical corrosion and has good wear resistance, so it can better protect the bearing to avoid the bearing being corroded by the slurry.

[0073] In some embodiments, the slurry stirring device further includes a driving mechanism disposed above the liquid sealing plate. And the slurry stirring device includes two dispersion shaft assemblies 10, and the driving mechanism jointly drives the dispersion shafts of the two dispersion shaft assemblies 10 to rotate.

[0074] By jointly driving the dispersion shafts of the two dispersion shaft assemblies 10 through the same driving mechanism, the synchronous movement of the two dispersion shafts can be ensured, and the structure of the driving mechanism can be simplified, making the structure of the slurry stirring device in the embodiments of the present application more simple and compact.

[0075] The slurry stirring device in some embodiments of the present application further includes a stirring shaft, which is rotatably arranged to stir the slurry. In some embodiments, the axis of the stirring shaft is arranged parallel and spaced from the axis of the dispersion shaft. And the dispersion shaft is arranged radially outside the stirring shaft. The stirring shaft drives the stirring paddles mounted thereon through rotation so that the solid particles and the solvent in the slurry can be more fully mixed. In some embodiments, the rotation speed of the dispersion shaft 11 is greater than the rotation speed of the stirring shaft.

[0076] Some other embodiments of the present application further provide a battery production line, including the above-mentioned slurry stirring device.

[0077] Next, according to Figures 1 to 4 a detailed description will be given of the structure of the slurry stirring device in a specific embodiment of the present application.

[0078] As Figures 1 to 4 shown, the slurry stirring device in this embodiment includes a dispersion shaft assembly 10. The dispersion shaft assembly 10 includes a dispersion shaft 11, a bearing 12, a bearing seat 13, a base 14, a sealing ring 15, a protective disc 16, a protective sleeve 17, an upper cover 18, and a driving wheel 19.

[0079] Among them, the driving wheel 19 is connected to the dispersion shaft 11 to be connected to the driving mechanism through a transmission mechanism such as a belt to drive the dispersion shaft 11 to rotate around its own axis to achieve the dispersion of the slurry. The upper cover 18 is connected to the dispersion shaft 11 and rotates with the dispersion shaft 11.

[0080] As Figures 2 to 4As shown in the figure, the dispersion shaft 11 is rotatably arranged on a liquid seal plate (not shown in the figure) through a bearing 12. A bearing seat 13 is fixedly arranged on the upper side of the liquid seal plate, and a base 14 is fixedly arranged on the lower side of the liquid seal plate. A sealing ring 15 is arranged in the through hole of the base 14 to form a sealing protection for the bearing 12 installed in the bearing seat 13. On the one hand, it prevents the slurry in the barrel from entering the bearing 12, and on the other hand, it prevents the grease in the bearing 12 from flowing into the slurry and polluting the slurry.

[0081] In the base 14 of this embodiment, two sealing rings 15 are arranged in an up-and-down stacked manner. Among them, the sealing ring located on the upper side is a fluororubber sealing ring, and the sealing ring located on the lower side is a silica gel sealing ring.

[0082] A protective disc 16 is arranged on the lower side of the base 14, and a material-throwing gap is formed between the upper surface of the protective disc 16 and the lower surface of the base 14. Compared with the sealing structure in the related art, according to the principle of centrifugal force, when the protective disc 16 rotates with the dispersion shaft 11, the slurry entering the above-mentioned material-throwing gap is more likely to be thrown out under the action of centrifugal force.

[0083] A protective sleeve 17 is further sleeved outside the protective disc 16. The bearing in this embodiment is protected by multiple layers of the protective sleeve 17, the protective disc 16 and the sealing ring 15. As a result, it is difficult for the slurry to invade, the service life of the bearing is extended, and the maintenance period of the equipment is also extended.

[0084] As Figure 4 shown in the figure, the cover body of the protective sleeve 17 is a frustum-shaped structure, so that the structural occupied volume is smaller on the basis of forming the first protection for the bearing.

[0085] In this embodiment, the disc body of the protective disc 16 is structurally changed to adopt a planar material-throwing disc. When the dispersion shaft rotates, the solvents on the surface of the planar material-throwing disc are all thrown away under the influence of centrifugal force, and are not easy to remain and invade upward, which better protects the bearing.

[0086] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and the components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slurry stirring device, characterized in that: include: A barrel, comprising a barrel body for containing slurry and a liquid sealing plate for sealing the barrel body; and A dispersion shaft assembly (10) comprises a dispersion shaft (11), a base (14), a bearing (12) and a protective plate (16), wherein the base (14) is fixedly arranged on the lower side of the liquid sealing plate, the dispersion shaft (11) is rotatably arranged on the liquid sealing plate via the bearing (12), and the dispersion shaft (11) passes through the base (14) and extends into the slurry in the barrel, the protective plate (16) is located below the base (14) and is fixedly arranged on the dispersion shaft (11) so as to rotate with the dispersion shaft (11), and the protective plate (16) comprises a plate body (161) spaced apart from the base (14) in the axial direction, and a material throwing gap is formed between the upper surface of the plate body (161) and the lower surface of the base (14).

2. The slurry stirring device according to claim 1, characterized in that: The height of the material-throwing gap in the axial direction is in the range of 2 mm ≤ d ≤ 7 mm.

3. The slurry stirring device according to claim 1, characterized in that: The upper surface of the disk body includes a smooth surface.

4. The slurry stirring device according to claim 1, characterized in that: The protective disk (16) further comprises a connecting sleeve (162), wherein the connecting sleeve (162) is arranged below the disk body (161) and is connected to the dispersion shaft (11).

5. The slurry stirring device according to claim 4, characterized in that: One end of the connecting sleeve (162) away from the disc body (161) is connected to the dispersion shaft (11), and the protective disc (16) further comprises an annular protrusion (163) which is arranged on the radial inner side of the disc body (161) and protrudes relative to the disc body (161) towards a side close to the base (14).

6. The slurry stirring device according to any one of claims 1 to 5, characterized in that: The dispersion shaft assembly (10) further comprises a protective sleeve (17) sleeved on the outside of the protective disk (16), and the protective sleeve (17) is connected to the base (14).

7. The slurry stirring device according to claim 6, characterized in that: The protective cover (17) is made of waterproof material.

8. The slurry stirring device according to any one of claims 1 to 5, characterized in that: The dispersion shaft assembly (10) further comprises a bearing seat (13) and at least two sealing rings (15) stacked in an axial direction, wherein the bearing seat (13) is arranged on the upper side of the liquid sealing plate and the bearing (12) is installed in the bearing seat (13), and the at least two sealing rings (15) are arranged on the lower side of the liquid sealing plate and installed in the base (14).

9. The slurry stirring device according to claim 8, characterized in that: The sealing ring at the lower end of the at least two sealing rings is made of silicone rubber, and the sealing ring at the upper end is made of fluororubber.

10. The slurry stirring device according to any one of claims 1 to 5, characterized in that: The slurry stirring device further comprises a driving mechanism arranged above the liquid sealing plate, and the slurry stirring device comprises two dispersion shaft assemblies (10), wherein the driving mechanism jointly drives the dispersion shafts of the two dispersion shaft assemblies (10) to rotate.

11. A battery production line, characterized in that: It comprises the slurry stirring device as claimed in any one of claims 1 to 10.

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