Particle size grading device for battery positive electrode material

Abstract

The utility model discloses a battery positive electrode material particle size grading device which comprises a cylindrical main body, an upper screen, a lower screen and a partition plate are sequentially arranged in the main body from top to bottom, both the upper screen and the lower screen are conical, the conical portion of the upper screen is arranged on the upper portion, and the conical portion of the lower screen is arranged on the lower portion. The interior of the main body is sequentially divided into a feeding area, a grading area, an under-screen area and a discharging area from top to bottom by the upper screen, the lower screen and the partition plate, a feeding pipe communicated with the feeding area is arranged on the upper surface of the main body, and a feeding valve is arranged on the feeding pipe; a discharging barrel communicated with the grading area is arranged at the circle center of the lower surface of the lower screen, the discharging end of the discharging barrel penetrates out of the lower surface of the partition plate to be communicated with the discharging area, and a battery positive electrode material flows more easily on the screens and is not prone to accumulation, so that the situation that the screens are blocked is effectively reduced, the screening efficiency is improved, and the working efficiency is improved; and the problems in the background technology can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a particle size grading device for battery cathode materials. Background Technique

[0002] The particle size of electrode materials has a certain impact on their specific surface area and the transmission distance of ions and electrons. Smaller particles can shorten the conduction distance of ions and electrons between electrode materials, and the contact area between sample particles and conductive agents is larger. Generally speaking, the particle size of lithium-ion battery cathode materials should be controlled between a few micrometers and more than ten micrometers, and at the same time, the particle size distribution is required to be uniform to avoid the situation of too large or too small particle size. Therefore, when producing battery cathode materials, it is necessary to grade their particle sizes and select materials that meet the requirements and have a uniform particle size distribution. Most of the existing particle size grading devices for battery cathode materials have unsatisfactory screening efficiency, resulting in low working efficiency, and it is easy for materials to agglomerate due to too small particle size during screening, affecting the screening effect. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a particle size grading device for battery cathode materials. The battery cathode materials flow more easily on the sieve mesh and are not easy to accumulate, thus effectively reducing the situation of sieve mesh blockage, improving the screening efficiency, and enhancing the working efficiency, and can effectively solve the problems in the background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A particle size grading device for battery cathode materials, including a cylindrical main body. An upper sieve mesh, a lower sieve mesh and a partition are sequentially arranged in the main body from top to bottom. Both the upper sieve mesh and the lower sieve mesh are conical, where the conical part of the upper sieve mesh is arranged above and the conical part of the lower sieve mesh is arranged below. The upper sieve mesh, the lower sieve mesh and the partition divide the interior of the main body into a feeding area, a grading area, a sub-sieve area and a discharging area from top to bottom in sequence. A feeding pipe communicated with the feeding area is arranged on the upper surface of the main body, and a feeding valve is arranged on the feeding pipe; at the center of the lower surface of the lower sieve mesh, there is a discharging cylinder communicated with the grading area. The discharging end of the discharging cylinder passes through the lower surface of the partition and is communicated with the discharging area, and a discharging valve is installed on the discharging cylinder near the lower sieve mesh. A stirring device is arranged inside the main body.

[0005] As a preferred technical solution of the utility model, the stirring device includes a driving motor installed at the center of the upper surface of the main body. The output shaft of the driving motor penetrates into the main body and is connected with a rotating shaft through a coupling. Several groups of upper rotating frames and lower rotating frames are respectively arranged on the outer surface of the rotating shaft. The upper rotating frames are arranged on the upper surface of the upper sieve mesh, and the lower rotating frames are arranged on the upper surface of the lower sieve mesh. Both the upper rotating frames and the lower rotating frames are inclined, where the upper rotating frames match the slope of the upper sieve mesh and the lower rotating frames match the slope of the lower sieve mesh.

[0006] As a preferred technical solution of the present invention, the upper rotating frame and the lower rotating frame have the same structure, and a through groove is provided on both the upper rotating frame and the lower rotating frame, and a toggle shaft is rotatably arranged in the through groove, and a toggle motor is installed on the side surface of the upper rotating frame and the lower rotating frame. The output shaft of the toggle motor passes through the through groove and is connected to the toggle shaft through a coupling, and several groups of toggle pieces are evenly provided on the outer surface of the toggle shaft.

[0007] As an optimal technical solution of the present invention, an annular upper discharge plate is arranged between the bottom outer surface of the upper screen and the inner wall of the main body, and an upper discharge port is opened on the side surface of the main body corresponding to the upper discharge plate. The upper discharge port is connected with one end of the circulation pipe, and the other end of the circulation pipe penetrates from the upper surface of the main body and is connected with the feed area. A circulation pipe valve is provided on the circulation pipe near the upper discharge port, and a circulation pump is installed on the circulation pipe.

[0008] As a preferred technical solution of the present invention, an air booster pump is installed in the middle of the upper surface of the main body, and the air outlet of the air booster pump is connected to the feed area.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: two-stage screening is performed using an upper screen and a lower screen, the upper screen filters out materials with larger particles, and the lower screen filters out materials with smaller particles, leaving only the material on the lower screen to ensure that the particle size distribution of the battery positive electrode material is uniform; both the upper screen and the lower screen are conical screens with a larger effective screening area, and the battery positive electrode material is more likely to pass through the gaps in the screen during the screening process, thereby improving the screening efficiency, and the structural design of the conical screen makes it easier for the battery positive electrode material to flow on the screen and not easily accumulate, thereby effectively reducing the clogging of the screen and further improving the screening efficiency; by arranging a stirring device to stir and stir the battery positive electrode material on the upper screen and the lower screen, accumulation can be further avoided, and at the same time, the material can be prevented from agglomerating due to too small a particle size, thereby improving the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 This is a side structural diagram of the present utility model;

[0012] Figure 3 For this utility model Figure 1 A magnified view of the structure at point A.

[0013] In the figure: 1 main body, 2 upper sieve, 3 lower sieve, 4 partition board, 5 feeding area, 6 grading area, 7 under-sieve area, 8 discharging area, 9 discharging cylinder, 10 feeding pipe, 11 feeding valve, 12 driving motor, 13 rotating shaft, 14 upper rotating frame, 15 lower rotating frame, 16 upper layer discharging plate, 17 dialing motor, 18 dialing shaft, 19 dialing piece, 20 circulating pipe, 21 circulating pump, 22 circulating pipe valve, 23 air booster pump, 24 discharging valve. Detailed implementation manners

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1-3 , the present invention provides a technical solution: a device for grading the particle size of a battery cathode material, including a cylindrical main body 1. An upper sieve 2, a lower sieve 3 and a partition board 4 are sequentially arranged in the main body 1 from top to bottom. Sieve holes (not shown in the figure) are formed in both the upper sieve 2 and the lower sieve 3. Among them, the aperture of the sieve holes of the lower sieve 3 is smaller than that of the upper sieve 2. Two-stage screening is carried out by using the upper sieve 2 and the lower sieve 3. The upper sieve 2 filters out the materials with larger particles, and the lower sieve 3 filters out the materials with smaller particles, leaving only the materials on the lower sieve 3 to ensure the uniform particle size distribution of the battery cathode material.

[0016] Both the upper sieve 2 and the lower sieve 3 are conical. Among them, the conical part of the upper sieve 2 is arranged above, and the conical part of the lower sieve 3 is arranged below. The effective screening area of the conical sieve is larger, and the battery cathode material is more likely to pass through the gaps of the sieve during the screening process, thereby improving the screening efficiency. Moreover, the structural design of the conical sieve makes the battery cathode material flow more easily on the sieve and is not easy to accumulate, thereby effectively reducing the situation of sieve blockage and further improving the screening efficiency.

[0017] The upper screen 2, the lower screen 3 and the partition 4 divide the interior of the main body 1 into a feeding area 5, a grading area 6, a screen under area 7 and a discharge area 8 from top to bottom. The upper surface of the main body 1 is provided with a feeding pipe 10 connected to the feeding area 5. The feeding pipe 10 is provided with a feeding valve 11. The battery positive electrode material is fed into the feeding area 5 through the feeding pipe 10. After the battery positive electrode material is filtered and screened by the upper screen 2, the larger particles slide to the outside, and the smaller particles enter the grading area 6 and then pass through the filtering screen of the lower screen 3. The battery positive electrode materials with appropriate and uniform particle sizes fall into the sieve lower area 7, and the battery positive electrode materials with appropriate and uniform particle sizes slide to the conical part of the lower screen 3. A discharge cylinder 9 connected with the grading area 6 is provided at the center of the lower surface of the lower screen 3. The discharge end of the discharge cylinder 9 passes through the lower surface of the partition 4 and is connected with the discharge area 8, and a discharge valve 24 is installed on the discharge cylinder 9 near the lower screen 3. The battery positive electrode materials with appropriate and uniform particle sizes pass through the discharge cylinder 9 and enter the discharge area 8, completing the grading and screening process of the battery positive electrode materials.

[0018] Discharge ports corresponding to the discharge area 8 and the under-sieve area 7 are respectively provided on the main body 1, and sealed doors are provided at the discharge ports (neither the discharge port nor the sealed door is shown in the drawings of the specification). After the particle size classification of the battery positive electrode material is completed, the two sealed doors are opened respectively, and the qualified materials and unqualified materials are taken out respectively and sent to the corresponding workshop for further processing or recycling.

[0019] A stirring device is provided inside the main body 1 for stirring and moving the battery positive electrode material on the upper screen 2 and the lower screen 3, etc., which can further avoid accumulation and prevent the material from agglomerating due to too small particle size, thereby improving the screening effect.

[0020] The upper and lower rotating frames 14 and 15 are respectively provided with a plurality of upper rotating frames 14 and a lower rotating frame 15, wherein the upper rotating frame 14 is provided on the upper surface of the upper screen 2, and the lower rotating frame 15 is provided on the upper surface of the lower screen 3, and the upper rotating frame 14 and the lower rotating frame 15 are both inclined, wherein the upper rotating frame 14 matches the inclination of the upper screen 2, and the lower rotating frame 15 matches the inclination of the lower screen 3. The driving motor 12 drives the plurality of upper rotating frames 14 and the lower rotating frames 15 to rotate respectively through the rotating shaft 13, and stirs and stirs the battery positive electrode material on the upper screen 2 and the lower screen 3 respectively, so as to avoid accumulation of material on the screen and affecting the screening effect.

[0021] Preferably, the upper rotating frame 14 and the lower rotating frame 15 have the same structure. Through slots are provided on both the upper rotating frame 14 and the lower rotating frame 15. A shifting shaft 18 is rotatably arranged in the through slots. And shifting motors 17 are installed on the side surfaces of both the upper rotating frame 14 and the lower rotating frame 15. The output shaft of the shifting motor 17 penetrates into the through slot and is connected to the shifting shaft 18 through a coupling. A number of groups of shifting blades 19 are evenly arranged on the outer surface of the shifting shaft 18. The shifting motor 17 drives the shifting blades 19 to rotate through the shifting shaft 18, so as to shift the battery positive electrode material on the upper screen 2 and the lower screen 3 in the vertical direction. Cooperating with the rotation of the upper rotating frame 14 and the lower rotating frame 15 can further prevent the material from accumulating or even blocking on the screen, etc.

[0022] The inside of the rotating shaft 13 is hollow and is used to pass the wire connected to the shifting motor 17. This wire is electrically connected to an external control switch through a slip ring to ensure that the wire of the shifting motor 17 will not be damaged when the rotating shaft 13 drives the upper rotating frame 14 and the lower rotating frame 15 to rotate.

[0023] Preferably, an annular upper discharge plate 16 is provided between the outer surface of the bottom of the upper screen 2 and the inner wall of the main body 1. An upper discharge port is provided on the side surface of the main body 1 corresponding to the upper discharge plate 16. After the battery positive electrode material is filtered and screened by the upper screen 2, the larger-particle-size material slides onto the upper discharge plate 16. The upper surface of the upper discharge plate 16 is slightly inclined and is inclined downward toward the upper discharge port, which is convenient for the battery positive electrode material to be discharged from here, so as to facilitate the recovery of the larger-particle-size material.

[0024] A circulation pipe 20 is detachably installed at the upper discharge port. The other end of the circulation pipe 20 penetrates into the main body 1 from the upper surface and is connected to the feeding area 5. A circulation pipe valve 22 is provided on the circulation pipe 20 near the upper discharge port. And a circulation pump 21 is installed on the circulation pipe 20. Through the circulation pump 21 and the circulation pipe 20, the material on the upper screen 2 can be brought back to the feeding area 5 inside the main body 1 from the upper discharge port for screening again, so as to avoid that in the previous screening process, the material with qualified particle size fails to pass through the screen holes due to faster sliding, thereby further improving the classification effect of the battery positive electrode material.

[0025] Preferably, an air booster pump 23 is installed in the middle of the upper surface of the main body 1. The air outlet of the air booster pump 23 is connected to the feeding area 5. Since the particle size of the battery positive electrode material is small, the aperture of the screen used for screening is also small, resulting in difficult passage of the material. Therefore, an air booster pump 23 is provided to pressurize the inside of the main body 1, so as to achieve pressurized classification, and the screening efficiency and effect are further improved.

[0026] When the main body 1 is pressurized, the feed valve 11, the discharge valve 24, the circulation pipe valve 22 and each sealing door are in a sealed state to avoid affecting the pressurization classification; the feed valve 11, the discharge valve 24, the circulation pipe valve 22, etc. can be selected from commonly used electric valves or solenoid valves.

[0027] Optionally, a vibration motor is also provided inside the main body 1. The vibration motor, feed valve 11, discharge valve 24, circulation pipe valve 22, drive motor 12, toggle motor 17, circulation pump 21 and air booster pump 23 are all electrically connected to an external control switch. The external control switch can be set on the outer surface of the main body 1 or in an external control box.

[0028] The vibration motor can be installed in the feeding area 5 or the grading area 6, and its vibrating end is connected to the upper screen 2 and the lower screen 3 respectively to drive them to vibrate, so as to further improve the grading efficiency.

[0029] The air booster pump 23, vibration motor, feed valve 11, discharge valve 24, circulation pipe valve 22, drive motor 12, toggle motor 17 and circulation pump 21 used in this application are all electronic components commonly used in the prior art. Their specific structure, working principle and circuit connection are all well-known technologies and will not be described in detail here.

[0030] The undisclosed parts of the present invention are all prior art, and their specific structures, materials and working principles will not be described in detail. Although the 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 variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A particle size grading device for a battery cathode material, comprising a cylindrical main body (1), characterized in that: Inside the said main body (1), a top sieve (2), a bottom sieve (3) and a partition plate (4) are successively arranged from top to bottom. Both the top sieve (2) and the bottom sieve (3) are conical. The conical part of the top sieve (2) is arranged above, and the conical part of the bottom sieve (3) is arranged below. The top sieve (2), the bottom sieve (3) and the partition plate (4) successively divide the interior of the main body (1) into a feeding area (5), a grading area (6), a sub-sieve area (7) and a discharging area (8) from top to bottom. A feeding pipe (10) communicating with the feeding area (5) is arranged on the upper surface of the main body (1), and a feeding valve (11) is arranged on the feeding pipe (10); at the center of the lower surface of the bottom sieve (3), a discharging cylinder (9) communicating with the grading area (6) is arranged. The discharging end of the discharging cylinder (9) penetrates through the lower surface of the partition plate (4) and communicates with the discharging area (8), and a discharging valve (24) is installed on the discharging cylinder (9) near the bottom sieve (3). A stirring device is arranged inside the main body (1).

2. The particle size grading device for a battery cathode material according to claim 1, wherein: The said stirring device includes a driving motor (12) installed at the center of the upper surface of the main body (1). The output shaft of the driving motor (12) penetrates into the interior of the main body (1) and is connected to a rotating shaft (13) through a coupling. Several groups of upper rotating frames (14) and lower rotating frames (15) are respectively arranged on the outer side surface of the rotating shaft (13). The upper rotating frames (14) are arranged on the upper surface of the top sieve (2), and the lower rotating frames (15) are arranged on the upper surface of the bottom sieve (3). Both the upper rotating frames (14) and the lower rotating frames (15) are inclined. Among them, the upper rotating frames (14) match the slope of the top sieve (2), and the lower rotating frames (15) match the slope of the bottom sieve (3).

3. The particle size grading device for a battery cathode material according to claim 2, characterized in that: The structures of the said upper rotating frames (14) and lower rotating frames (15) are the same. Through grooves are opened on both the upper rotating frames (14) and the lower rotating frames (15). Stirring shafts (18) are rotatably arranged in the through grooves. Stirring motors (17) are installed on the side surfaces of both the upper rotating frames (14) and the lower rotating frames (15). The output shafts of the stirring motors (17) penetrate into the through grooves and are connected to the stirring shafts (18) through couplings. Several groups of stirring vanes (19) are evenly opened on the outer side surface of the stirring shafts (18).

4. A particle size grading device for a battery cathode material according to claim 1, characterized in that: An annular upper discharging plate (16) is arranged between the outer side surface of the bottom of the top sieve (2) and the inner wall of the main body (1). An upper discharging port is opened on the side surface of the main body (1) corresponding to the upper discharging plate (16). The upper discharging port is communicated with one end of a circulating pipe (20). The other end of the circulating pipe (20) penetrates into the main body (1) from the upper surface and is communicated with the feeding area (5). A circulating pipe valve (22) is arranged on the circulating pipe (20) near the upper discharging port, and a circulating pump (21) is installed on the circulating pipe (20).

5. A particle size grading device for a battery cathode material according to any one of claims 1-4, characterized in that: An air booster pump (23) is installed in the middle of the upper surface of the main body (1). The air outlet of the air booster pump (23) is communicated with the feeding area (5).

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