Impregnation device for lithium ion coal pitch-based hard carbon negative electrode material

Abstract

The impregnation device comprises a reaction barrel and a top plate, the upper end of the reaction barrel is in an open state, the lower end face of the top plate is clamped at the open position of the upper end of the reaction barrel, an impregnation basket is slidably connected into the reaction barrel, the upper end face of the top plate is rotatably connected with a reciprocating lead screw, and the reciprocating lead screw is connected with the impregnation basket. And a stirring mechanism is mounted below the sliding plate. The reaction barrel and the top plate are matched to form the closed impregnation cavity, the stirring mechanism is driven to slide up and down in a reciprocating mode through rotation of the reciprocating lead screw, and meanwhile, the whole impregnation liquid is fully stirred and diffused in the cavity in cooperation with rotation of the stirring mechanism; therefore, the problem that a traditional stirring roller is limited in stirring area and can only act on a local area of the surface is solved, the contact efficiency of all materials and a solution is improved, it is ensured that the interiors of the materials can be fully infiltrated with an activating agent, and the impregnation effect and the product quality are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of production of lithium battery negative electrode materials, in particular to an impregnation device for lithium ion coal tar pitch based hard carbon negative electrode materials. Background Art

[0002] With the widespread application of lithium-ion batteries in electronic devices, electric vehicles and energy storage systems, the requirements for their performance are increasing day by day. The core of battery performance lies in its electrode materials, especially the negative electrode materials. Coal tar pitch-based hard carbon materials have become an ideal negative electrode material for lithium-ion batteries due to their good cycle performance and high capacity characteristics. However, the preparation process of coal tar pitch-based hard carbon negative electrode materials in practical applications, especially the impregnation process, has a significant impact on their final performance.

[0003] At present, when impregnating lithium-ion coal tar pitch-based hard carbon negative electrode materials, the materials are soaked in the solution for a period of time to allow the activator to fully penetrate into the hard carbon material. However, the impregnation uniformity is poor, and it is difficult to ensure that all materials can fully contact the solution. To ensure the impregnation effect, most devices use a stirring roller to promote the uniform distribution and flow of the solution. However, in actual use, the stirring area of ​​the stirring roller is limited, and it can only act on the local surface area of ​​the solution and the material, making it difficult to achieve uniform impregnation of the entire material, resulting in a reduction in the impregnation effect. Therefore, it is necessary to redesign an impregnation device for lithium-ion coal tar pitch-based hard carbon negative electrode materials to address the above problems. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an impregnation device for lithium ion coal tar pitch based hard carbon negative electrode material.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for impregnating lithium-ion coal tar pitch-based hard carbon negative electrode materials comprises a reaction barrel and a top plate, wherein the upper end of the reaction barrel is open, the lower end surface of the top plate is engaged with the upper open end of the reaction barrel, an impregnation basket is slidably connected in the reaction barrel, a reciprocating screw is rotatably connected to the upper end surface of the top plate, a screw sleeve is threadedly connected to the threaded section of the reciprocating screw, the screw sleeve is connected to a slide plate through a connecting mechanism, and a stirring mechanism is installed below the slide plate.

[0007] Preferably, the connecting mechanism comprises connecting rods fixedly connected to the outer walls of both sides of the screw sleeve, the ends of the connecting rods are fixedly connected to the slide plate, the positions of the two groups of connecting rods are symmetrical to each other, and both are slidably connected to the top plate.

[0008] Preferably, the stirring mechanism comprises a rotating rod rotatably connected to the lower end surface of the slide plate, and a plurality of groups of stirring rods are fixedly connected to the outer wall of the rotating rod.

[0009] Preferably, the upper end surface of the top plate is fixedly connected to a limit rod, and the lead screw sleeve is slidably connected to the outer wall of the limit rod.

[0010] Preferably, a feed pipe and a drain pipe are respectively installed at the upper end of the top plate and the lower end of the reaction barrel, the feed pipe penetrates the top plate body and extends to the other side of the top plate, and the drain pipe is connected to the inside of the reaction barrel.

[0011] Preferably, a limiting ring is fixedly connected to the inner wall of the reaction barrel, a baffle is fixedly connected to the upper end of the immersion basket, and the lower end surface of the baffle is in contact with the upper end surface of the limiting ring.

[0012] Preferably, a side panel is fixedly connected to the upper end of the top panel, and the outer wall of the side panel is L-shaped.

[0013] Preferably, the side plates and the upper end surfaces of the slide plate are respectively fixedly connected with servo motor 1 and servo motor 2, and the output shafts of servo motor 1 and servo motor 2 are respectively coaxially fixedly connected with the reciprocating screw and the rotating rod.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model forms a closed impregnation chamber by arranging a reaction barrel and a top plate, and drives the stirring mechanism to slide reciprocatingly up and down through the rotation of the reciprocating screw. At the same time, the entire impregnation liquid is fully stirred and diffused in the chamber in coordination with the rotation of the stirring mechanism, thereby solving the problem that the traditional stirring roller has a limited stirring area and can only act on a local area of ​​the surface, improving the contact efficiency between all materials and the solution, ensuring that the inside of the material can also be fully infiltrated by the activator, and significantly improving the impregnation effect and product quality.

[0016] 2. The utility model limits the up and down movement of the immersion basket in the reaction barrel through the cooperation of the limit ring and the baffle, preventing the immersion basket from tilting or shifting during the immersion process, thereby ensuring the stability of the entire immersion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an impregnation device for a lithium-ion coal tar pitch-based hard carbon negative electrode material proposed in the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the middle top plate and its external components.

[0019] Figure 3 for Figure 1 Cross-sectional view of the middle reaction barrel.

[0020] In the figure: 1. reaction barrel; 2. immersion basket; 3. baffle; 4. top plate; 5. feed pipe; 6. side plate; 7. servo motor 1; 8. reciprocating screw; 9. limit rod; 10. connecting rod; 11. slide plate; 12. servo motor 2; 13. rotating rod; 14. stirring rod; 15. limit ring; 16. screw sleeve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-3 A device for impregnating lithium-ion coal tar pitch-based hard carbon negative electrode materials comprises a reaction barrel 1 and a top plate 4. The upper end of the reaction barrel 1 is open, and the lower end surface of the top plate 4 is engaged with the upper open end of the reaction barrel 1. An impregnation basket 2 is slidably connected in the reaction barrel 1, and a reciprocating screw 8 is rotatably connected to the upper end surface of the top plate 4. A screw sleeve 16 is threadedly connected to the threaded section of the reciprocating screw 8. The screw sleeve 16 is connected to a slide plate 11 through a connecting mechanism, and a stirring mechanism is installed under the slide plate 11; the reaction barrel 1 and the top plate 4 form a closed impregnation chamber, and the impregnation uniformity is improved by the stirring mechanism.

[0023] The connecting mechanism includes a connecting rod 10 fixedly connected to the outer walls of both sides of the screw sleeve 16, the ends of the connecting rod 10 are fixedly connected to the slide plate 11, the positions of the two groups of connecting rods 10 are symmetrical to each other, and both are slidingly connected to the top plate 4, and the stirring mechanism includes a rotating rod 13 rotatably connected to the lower end surface of the slide plate 11, and the outer wall of the rotating rod 13 is fixedly connected to multiple groups of stirring rods 14; the stirring rods 14 are fully stirred in the impregnation liquid to improve the uniform distribution of the impregnation solution and ensure that all hard carbon negative electrode materials in the impregnation basket 2 are fully impregnated.

[0024] The upper end surface of the top plate 4 is fixedly connected to the limit rod 9, and the screw sleeve 16 is slidably connected to the outer wall of the limit rod 9. The upper end of the top plate 4 and the lower end of the reaction barrel 1 are respectively installed with a feed pipe 5 and a drain pipe. The feed pipe 5 passes through the main body of the top plate 4 and extends to the other side of the top plate 4. The drain pipe is connected to the inside of the reaction barrel 1. The inner wall of the reaction barrel 1 is fixedly connected to the limit ring 15. The upper end of the immersion basket 2 is fixedly connected to the baffle 3. The lower end surface of the baffle 3 contacts the upper end surface of the limit ring 15. The upper end of the top plate 4 is fixedly connected There is a side plate 6, the outer wall of the side plate 6 is L-shaped, and the upper end surfaces of the side plate 6 and the slide plate 11 are respectively fixedly connected with a servo motor 7 and a servo motor 12, and the output shafts of the servo motor 7 and the servo motor 12 are respectively coaxially fixedly connected with the reciprocating screw 8 and the rotating rod 13; the lower end surface of the baffle 3 contacts the upper end surface of the limit ring 15, thereby limiting the up and down movement range of the immersion basket 2 in the reaction barrel 1, preventing it from tilting or displacing, and ensuring stability and immersion effect during the immersion process.

[0025] In the utility model, when the device is started, servo motor 1 7 and servo motor 2 12 start to run at the same time, the output shaft of servo motor 1 7 drives the reciprocating screw 8 to rotate, and the output shaft of servo motor 2 12 also drives the rotating rod 13 to rotate through a coaxial connection. The rotation of the reciprocating screw 8 will cause the screw sleeve 16 to move up and down along the screw, thereby driving the connecting rod 10 and the slide plate 11 to slide on the upper end surface of the top plate 4. The movement of the slide plate 11 can drive the rotating rod 13 below it to slide up and down, and cooperate with the servo motor 2 12 to drive the rotating rod 13 to rotate. The multiple groups of stirring rods 14 on the rotating rod 13 are fully stirred in the impregnation liquid to ensure that the impregnation liquid is evenly distributed in the entire chamber, thereby improving the impregnation uniformity of the hard carbon negative electrode material.

[0026] The dipping basket 2 is placed in the reaction barrel 1, and a baffle 3 is connected to the upper end of the dipping basket 2. The lower end surface of the baffle 3 contacts the limit ring 15 fixed on the inner wall of the reaction barrel 1, which limits the up and down movement of the dipping basket 2 and prevents it from tilting or displacement. When the dipping liquid is injected into the reaction barrel 1 through the feed pipe 5, the reaction barrel 1 and the top plate 4 form a closed dipping chamber, ensuring that the entire dipping process is carried out in a sealed environment.

[0027] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. An impregnation device for lithium ion coal tar pitch based hard carbon negative electrode material, characterized in that: The invention comprises a reaction barrel (1) and a top plate (4), wherein the upper end of the reaction barrel (1) is in an open state, the lower end surface of the top plate (4) is engaged with the upper open end of the reaction barrel (1), an immersion basket (2) is slidably connected inside the reaction barrel (1), the upper end surface of the top plate (4) is rotatably connected to a reciprocating screw (8), a screw sleeve (16) is threadedly connected to the threaded section of the reciprocating screw (8), the screw sleeve (16) is connected to a slide plate (11) via a connecting mechanism, and a stirring mechanism is installed below the slide plate (11).

2. The impregnation device of a lithium ion coal tar pitch based hard carbon negative electrode material according to claim 1, characterized in that: The connection mechanism comprises connecting rods (10) fixedly connected to the outer walls of both sides of the lead screw sleeve (16), the ends of the connecting rods (10) being fixedly connected to the slide plate (11), the two groups of connecting rods (10) being symmetrically positioned and both being slidably connected to the top plate (4).

3. The impregnation device of a lithium ion coal tar pitch based hard carbon negative electrode material according to claim 2, characterized in that: The stirring mechanism comprises a rotating rod (13) rotatably connected to the lower end surface of the slide plate (11), and a plurality of groups of stirring rods (14) are fixedly connected to the outer wall of the rotating rod (13).

4. The impregnation device of a lithium ion coal tar pitch based hard carbon negative electrode material according to claim 3, characterized in that: The upper end surface of the top plate (4) is fixedly connected to a limit rod (9), and the lead screw sleeve (16) is slidably connected to the outer wall of the limit rod (9).

5. The impregnation device of the lithium ion coal tar pitch based hard carbon negative electrode material according to claim 4, characterized in that: A feed pipe (5) and a drain pipe are respectively installed at the upper end of the top plate (4) and the lower end of the reaction barrel (1); the feed pipe (5) passes through the main body of the top plate (4) and extends to the other side of the top plate (4); and the drain pipe is connected to the interior of the reaction barrel (1).

6. The impregnation device for a lithium ion coal tar pitch-based hard carbon negative electrode material according to claim 5, characterized in that: The inner wall of the reaction barrel (1) is fixedly connected to a limiting ring (15), the upper end of the immersion basket (2) is fixedly connected to a baffle (3), and the lower end surface of the baffle (3) is in contact with the upper end surface of the limiting ring (15).

7. The impregnation device of the lithium ion coal tar pitch based hard carbon negative electrode material according to claim 6, characterized in that: The upper end of the top plate (4) is fixedly connected to a side plate (6), and the outer wall of the side plate (6) is L-shaped.

8. The impregnation device for a lithium ion coal tar pitch-based hard carbon negative electrode material according to claim 7, characterized in that: The side plates (6) and the upper end surfaces of the slide plate (11) are respectively fixedly connected with a servo motor 1 (7) and a servo motor 2 (12); the output shafts of the servo motor 1 (7) and the servo motor 2 (12) are respectively coaxially fixedly connected with the reciprocating screw (8) and the rotating rod (13).

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