Negative electrode material vacuum drying device

Abstract

The utility model relates to negative material vacuum drying device, including drying cylinder, the vacuum pump is installed on drying cylinder, the inside of drying cylinder is equipped with rotatable stirring sleeve to vertical direction, the outside of stirring sleeve is connected with a plurality of stirring rod, the inside top side of stirring sleeve in drying cylinder is connected with the communicating pipe, the side that communicates pipe is away from stirring sleeve is connected with the rotating plate, and the far side of rotating plate is connected with the cleaning scraper, and the both sides of rotating plate are equipped with a plurality of through -hole, and the inside of rotating plate is equipped with the air -blowing to -through -hole's jet element, and the outside of drying cylinder is equipped with the gas supply spare for the inert gas into the stirring sleeve. The utility model discloses through the cleaning scraper on the rotating plate can scrape the material that sticks to the inner wall of drying cylinder, simultaneously through the jet element and sprays inert gas from the through -hole, and the inner wall of drying cylinder, stirring sleeve and stirring rod are cleaned and swept, need not manual dismantling component, and cleaning is convenient and fast, improves production efficiency, reduces the influence of material residue to subsequent production.

Description

Technical Field

[0001] This utility model relates to the field of battery production equipment technology, and in particular to a vacuum drying device for negative electrode materials. Background Technology

[0002] In lithium battery manufacturing, the drying process of the negative electrode material is one of the core steps affecting battery performance. Negative electrode materials (such as graphite and silicon-based materials) have the characteristics of high activity and easy moisture absorption, and their drying quality is directly related to the adhesion of the electrode sheet, conductivity, and battery cycle life.

[0003] Existing drying equipment generally suffers from the following problems: during the drying process, the negative electrode material easily adheres to the inner wall of the drying cylinder and the surface of the stirring components, while existing equipment lacks an integrated cleaning mechanism. Manual disassembly and cleaning is not only time-consuming and labor-intensive, but may also lead to component wear or seal failure, affecting the service life of the equipment. For example, some units require shutdown and high-pressure water jet rinsing, which not only increases water consumption but may also cause internal rust and corrosion. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a vacuum drying device for negative electrode materials. The specific technical solution is as follows:

[0005] A vacuum drying device for negative electrode materials includes a drying cylinder with a vacuum pump installed on it. A rotatable stirring sleeve is vertically positioned inside the drying cylinder, and multiple stirring rods are connected to the outer side of the stirring sleeve. A connecting pipe is connected to the top side of the stirring sleeve inside the drying cylinder. A rotating plate is connected to the side of the connecting pipe away from the stirring sleeve. A cleaning scraper that contacts the inner wall of the drying cylinder is connected to the side of the rotating plate away from the stirring sleeve. Multiple through holes are provided on both sides of the rotating plate. An air jet device is provided inside the rotating plate to blow air into the through holes. The air jet device is connected to the connecting pipe. A gas supply device for introducing inert gas into the stirring sleeve is provided on the outer side of the drying cylinder.

[0006] Preferably, it further includes a rotating part for driving the stirring sleeve to rotate. The rotating part includes a drive motor mounted on the top of the drying cylinder. The top side of the stirring sleeve is rotatably connected to the top of the drying cylinder. The top output shaft of the drive motor is connected to a first gear, and the top side of the stirring sleeve is connected to a second gear. The second gear meshes with the first gear.

[0007] Preferably, the air supply component includes a top frame installed on the top of the drying cylinder, on which an air pump and an air tank are mounted. The air pump's suction end is connected to the air tank, and the air pump's outlet end is connected to the top of the stirring sleeve via a rotary joint.

[0008] Preferably, the jetting component includes a jet manifold located inside the rotating plate, and multiple nozzles are installed on the side of the jet manifold near the through hole, with one end of each nozzle connected to a connecting pipe.

[0009] Preferably, the top of the drying cylinder is provided with a top opening on the side near the rotating plate, and a U-shaped sealing frame is inserted inside the rotating plate. When the U-shaped sealing frame is fully inserted into the interior of the rotating plate, the side of the U-shaped sealing frame blocks the through hole.

[0010] Preferably, the bottom outer side of the drying cylinder is threadedly connected to a bottom cylinder, a discharge pipe is installed at the bottom of the bottom cylinder, and a valve is installed on the bottom cylinder.

[0011] The beneficial effects of this utility model are:

[0012] 1. A vacuum environment is created by drawing air out of the drying cylinder using a vacuum pump, which lowers the boiling point of the material. At the same time, the stirring sleeve and stirring rod stir the material, ensuring that the material is heated evenly and significantly improving the drying efficiency.

[0013] 2. The cleaning scraper on the rotating plate can scrape off the material adhering to the inner wall of the drying cylinder. At the same time, inert gas is sprayed out from the through hole through the jet component to blow and clean the inner wall of the drying cylinder, the mixing sleeve and the mixing rod. There is no need to manually disassemble the parts, making cleaning convenient and quick, improving production efficiency and reducing the impact of material residue on subsequent production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a top view of the internal structure of the rotating plate in this utility model;

[0016] Figure 3 This is a side view of the rotating plate in this utility model.

[0017] Reference numerals: 1. Drying cylinder; 100. Top opening; 2. Bottom cylinder; 21. Discharge pipe; 3. Vacuum pump; 4. Stirring sleeve; 5. Connecting pipe; 6. Rotating plate; 61. Through hole; 62. Cleaning scraper; 7. U-shaped sealing frame; 8. Stirring rod; 9. Drive motor; 91. First gear; 10. Second gear; 11. Air pump; 12. Top frame; 13. Air jet main pipe; 131. Nozzle; 14. Air tank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Example

[0020] For a vacuum drying apparatus for negative electrode materials, please refer to [reference needed]. Figures 1-3The purpose of this utility model is to provide a vacuum drying device for negative electrode materials to solve the problems of low drying efficiency, easy oxidation of materials, and inconvenient cleaning in the prior art, and to achieve the functions of efficient drying, anti-oxidation and convenient cleaning.

[0021] The vacuum drying device for negative electrode materials includes a drying cylinder 1, a vacuum pump 3, a stirring sleeve 4, a connecting pipe 5, a rotating plate 6, a cleaning scraper 62, a through hole 61, an air jetting component, an air supply component, a rotating part, a U-shaped sealing frame 7, a bottom cylinder 2, and a discharge pipe 21, etc. The specific structure and connection relationship of each component are as follows:

[0022] The drying cylinder 1 is the main container of the device, used to hold and dry the negative electrode material. The top of the drying cylinder 1 has a top opening 100 for easy material loading; the bottom outer side is connected to the bottom cylinder 2 via threads. The bottom of the bottom cylinder 2 is equipped with a discharge pipe 21 and a valve to control material discharge. The threaded connection facilitates the disassembly and assembly of the bottom cylinder 2 and the drying cylinder 1, and makes cleaning of the bottom of the drying cylinder 1 convenient.

[0023] Vacuum pump 3 is installed on the outside of drying cylinder 1 and is connected to the inside of drying cylinder 1 through a pipe. It is used to extract air from the drying cylinder 1 to form a vacuum environment, reduce the boiling point of the material, and improve drying efficiency.

[0024] The stirring sleeve 4 is vertically installed inside the drying cylinder 1 and can rotate around its axis. Multiple stirring rods 8 are connected to the outside of the stirring sleeve 4. The stirring rods 8 rotate with the stirring sleeve 4 to stir the negative electrode material inside the drying cylinder 1, so that the material is heated evenly and the drying efficiency is further improved.

[0025] The rotating part includes a drive motor 9, a first gear 91, and a second gear 10. The drive motor 9 is mounted on the top of the drying cylinder 1, and its top output shaft is fixedly connected to the first gear 91. The top side of the stirring sleeve 4 is rotatably connected to the top of the drying cylinder 1, and the top side of the stirring sleeve 4 is fixedly connected to the second gear 10, which meshes with the first gear 91. When the drive motor 9 is working, it drives the stirring sleeve 4 to rotate through the meshing transmission of the first gear 91 and the second gear 10, thereby realizing the stirring function. This transmission structure is simple and reliable, and facilitates the stable rotation of the stirring sleeve 4.

[0026] In the jet cleaning structure, one end of the connecting pipe 5 is connected to the top side of the stirring sleeve 4 inside the drying cylinder 1, and the other end is connected to the rotating plate 6, which is used to transport the inert gas in the stirring sleeve 4 to the rotating plate 6.

[0027] The rotating plate 6 is located inside the top side of the drying cylinder 1 and is connected to the side of the connecting pipe 5 away from the stirring sleeve 4. A cleaning scraper 62 is fixedly connected to the side of the rotating plate 6 away from the stirring sleeve 4. The cleaning scraper 62 is in contact with the inner wall of the drying cylinder 1. When the rotating plate 6 rotates, the cleaning scraper 62 can scrape off the material adhering to the inner wall of the drying cylinder 1. Multiple through holes 61 are provided on both sides of the rotating plate 6, and air jets are provided inside. The air jets are connected to the connecting pipe 5 and are used to spray inert gas from the through holes 61 to clean the inner wall of the drying cylinder 1, the stirring sleeve 4, and the stirring rod 8.

[0028] The jetting component includes a jet manifold 13 located inside the rotating plate 6 and multiple nozzles 131. Multiple nozzles 131 are installed on the side of the jet manifold 13 near the through hole 61. One end of each nozzle 131 is connected to the connecting pipe 5, and the other end faces the through hole 61. Inert gas enters the jet manifold 13 through the connecting pipe 5 and is then ejected from the through hole 61 through the nozzles 131, forming an airflow that purges and cleans the inner wall of the drying cylinder 1 and the stirring components.

[0029] In the gas supply structure, the gas supply components include a top frame 12, an air pump 11, and a gas tank. The top frame 12 is mounted on top of the drying cylinder 1, and the air pump 11 and gas tank are mounted on the top frame 12. The suction end of the air pump 11 is connected to the gas tank for drawing inert gas (such as nitrogen) from the tank; the outlet end of the air pump 11 is connected to the top of the stirring sleeve 4 via a rotary joint. The rotary joint allows the stirring sleeve 4 to rotate while maintaining the continuity of the gas path, enabling the inert gas to be ejected from the through hole 61 through the stirring sleeve 4, the connecting pipe 5, and the jet nozzle. The gas supply components provide inert gas for jet cleaning, thus cleaning the equipment.

[0030] Furthermore, this application can add a valve to the top of the stirring sleeve 4. By opening the valve, the stirring sleeve 4 can also introduce inert gas into the drying cylinder 1 during the drying process to prevent the negative electrode material from oxidizing.

[0031] In the sealing structure, the U-shaped sealing frame 7 is inserted inside the rotating plate 6. When the U-shaped sealing frame 7 is fully inserted into the rotating plate 6, its sidewall can seal the through hole 61. When drying materials, the U-shaped sealing frame 7 is inserted into the rotating plate 6, and the top opening 100 is sealed with a cover to prevent outside air and materials from entering the rotating plate 6 through the through hole 61, ensuring that the drying process is carried out in a vacuum and inert gas environment. When it is necessary to clean the inside of the drying cylinder 1, the U-shaped sealing frame 7 is pulled out from the rotating plate 6. At this time, the through hole 61 is opened, and air can be sprayed into the inner wall of the drying cylinder 1, the stirring sleeve 4, and the stirring rod 8 through the through hole 61 for cleaning.

[0032] Work process: During the drying process, open the top opening 100, load the negative electrode material into the drying cylinder 1, then seal the top opening 100 with the cover, and at the same time, fully insert the U-shaped sealing frame 7 into the rotating plate 6 to seal the through hole 61 and prevent the material from entering the rotating plate 6.

[0033] Start the vacuum pump 3 to extract air from the drying cylinder 1 and create a vacuum environment; you can also open the valve of the stirring sleeve 4 and start the air pump 11. The air pump 11 extracts inert gas from the gas tank and flows out from the valve. The inert gas forms an inert gas environment in the drying cylinder 1 to prevent the material from oxidizing.

[0034] By starting the drive motor 9, the drive motor 9 drives the stirring sleeve 4 and the stirring rod 8 to rotate through the meshing transmission of the first gear 91 and the second gear 10, thereby stirring the negative electrode material in the drying cylinder 1 and making the material dry evenly in a vacuum and inert gas environment.

[0035] After drying is complete, open the valve on the bottom cylinder 2 and discharge the dried negative electrode material through the discharge pipe 21. After discharging the material, close the valve, pull out the U-shaped sealing frame 7, and open the through hole 61 on the rotating plate 6.

[0036] When the air pump 11 is started, inert gas is ejected from the through hole 61 through the stirring sleeve 4, the connecting pipe 5, the jet manifold 13 and the nozzle 131. One through hole 61 sprays air into the inner wall of the drying cylinder 1 to blow away the material adhering to the inner wall of the drying cylinder 1; the other through hole 61 sprays air into the stirring sleeve 4 and the stirring rod 8 to clean the material residue on the stirring components. At the same time, the rotating plate 6 rotates under the drive of the stirring sleeve 4, and the cleaning scraper 62 rotates with the rotating plate 6 to scrape off the material on the inner wall of the drying cylinder 1, further improving the cleaning effect.

[0037] After cleaning, the bottom cylinder 2 can be disassembled as needed to thoroughly clean the bottom of the drying cylinder 1, and then the device can be reassembled to prepare for the next drying operation.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum drying apparatus for negative electrode materials, comprising a drying cylinder (1), a vacuum pump (3) mounted on the drying cylinder (1), a rotatable stirring sleeve (4) arranged vertically inside the drying cylinder (1), and a plurality of stirring rods (8) connected to the outer side of the stirring sleeve (4), characterized in that, The stirring sleeve (4) is located inside the drying cylinder (1) and connected to a connecting pipe (5). A rotating plate (6) is connected to the side of the connecting pipe (5) away from the stirring sleeve (4). A cleaning scraper (62) that contacts the inner wall of the drying cylinder (1) is connected to the side of the rotating plate (6) away from the stirring sleeve (4). Multiple through holes (61) are provided on both sides of the rotating plate (6). An air jet is provided inside the rotating plate (6) to blow air into the through holes (61). The air jet is connected to the connecting pipe (5). An air supply device for introducing inert gas into the stirring sleeve (4) is provided on the outside of the drying cylinder (1).

2. The vacuum drying apparatus for negative electrode materials according to claim 1, characterized in that: It also includes a rotating part for driving the stirring sleeve (4) to rotate. The rotating part includes a drive motor (9) installed on the top of the drying cylinder (1). The top side of the stirring sleeve (4) is rotatably connected to the top of the drying cylinder (1). The top output shaft of the drive motor (9) is connected to a first gear (91). The top side of the stirring sleeve (4) is connected to a second gear (10). The second gear (10) and the first gear (91) mesh with each other.

3. The vacuum drying apparatus for negative electrode materials according to claim 2, characterized in that: The air supply component includes a top frame (12) installed on the top of the drying cylinder (1). An air pump (11) and an air tank (14) are installed on the top frame (12). The air pump (11) has its suction end connected to the air tank (14), and the air pump (11) has its outlet end connected to the top of the stirring sleeve (4) through a rotary joint.

4. The vacuum drying apparatus for negative electrode materials according to claim 3, characterized in that: The jetting component includes a jet manifold (13) located inside the rotating plate (6). A plurality of nozzles (131) are installed on the side of the jet manifold (13) near the through hole (61). One end of each nozzle (131) is connected to the connecting pipe (5).

5. The vacuum drying apparatus for negative electrode materials according to claim 4, characterized in that: The top of the drying cylinder (1) is provided with a top opening (100) on the side near the rotating plate (6). A U-shaped sealing frame (7) is inserted inside the rotating plate (6). When the U-shaped sealing frame (7) is fully inserted into the rotating plate (6), the side of the U-shaped sealing frame (7) blocks the through hole (61).

6. The vacuum drying apparatus for negative electrode materials according to claim 5, characterized in that: The bottom outer side of the drying cylinder (1) is threadedly connected to a bottom cylinder (2), and a discharge pipe (21) is installed at the bottom of the bottom cylinder (2). A valve is installed on the bottom cylinder (2).

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