Graphite crucible for negative electrode material production

Abstract

The utility model relates to a graphite crucible, in particular to a graphite crucible for negative electrode material production, which comprises a bottom plate and a crucible, two vertical plates are symmetrically and fixedly arranged on the bottom plate, the outer wall of the crucible is fixedly connected with a heating kettle for heating the crucible, the heating kettle is rotatably mounted between the two vertical plates, and a sealing cover is mounted on the crucible in an inserting manner; a plurality of gas dispersing blocks for realizing a gas discharging function in the crucible are arranged in the sealing cover in a sliding manner, and in the production of a negative electrode material, when the gas pressure in the crucible is increased, the gas dispersing blocks are jacked up to expose the gas dispersing grooves for exhausting; when the pressure is reduced, the air dispersing block slightly moves under the action of the spring and the air pressure, and the exposed area of the air dispersing groove is adjusted; when the pressure is too low, the gas dispersing block is reset by the spring, the channel is closed, and the pressure in the crucible is kept stable; a notch is formed in the inner wall of the opening end of the crucible and used for conveniently pouring materials, and limiting plates used for limiting and supporting the rotation angle of the heating kettle are symmetrically arranged on the bottom plate in a sliding mode.

Description

Technical Field

[0001] This utility model relates to a graphite crucible, and more particularly to a graphite crucible for the production of negative electrode materials. Background Technology

[0002] With the explosive growth of new energy vehicles, energy storage systems and other fields, the demand for lithium battery anode materials has surged. Due to its advantages such as long cycle life and low cost, artificial graphite has become the mainstream anode material, and its production scale has expanded rapidly.

[0003] Chinese Patent CN209929406U discloses a graphite crucible for the production of lithium battery anode materials. By setting a cover plate, a pressure plate, studs, and a handle, it achieves the effect of facilitating workers to compact the material inside the crucible body, ensuring uniform material compaction, and preventing material leakage during compaction through the cover plate.

[0004] However, in the venting process of anode material production, the crucible is difficult to automatically adjust the gas emission according to changes in internal gas pressure, resulting in unstable pressure inside the crucible and affecting the production process; moreover, the crucible becomes too hot after production, making the tilting operation extremely inconvenient. Utility Model Content

[0005] The main objective of this invention is to provide a graphite crucible for the production of negative electrode materials, in order to solve the problems raised in related technologies.

[0006] To achieve the above objectives, according to one aspect of this utility model, a graphite crucible for producing negative electrode materials is provided, comprising a base plate and a crucible. Two vertical plates are symmetrically fixedly arranged on the base plate. A heating vessel for heating the crucible is fixedly connected to the outer wall of the crucible, and the heating vessel is rotatably installed between the two vertical plates. A sealing cover is inserted and installed on the crucible. Several gas dispersing blocks for venting gas from the crucible are slidably arranged inside the sealing cover. A notch is opened on the inner wall of the crucible opening end for convenient pouring of materials. A limiting plate for limiting the rotation angle of the heating vessel is also symmetrically slidably arranged on the base plate.

[0007] Furthermore, a retaining ring is fixedly provided on the top of the crucible, and an annular groove is provided at the bottom of the sealing cover, with the retaining ring inserted into the annular groove.

[0008] Furthermore, the air diffuser block is a hollow column, a limiting ring is fixedly connected to the outer wall of the air diffuser block, a number of air diffuser grooves are formed in a ring array at the upper end of the air diffuser block, and a filter plate is fixedly installed at the bottom of the air diffuser block.

[0009] Furthermore, the sealing cover has several slots, the air diffuser block is slidably installed in the slots, and the sealing cover has several grooves that communicate with the slots respectively, the limiting ring is slidably installed in the grooves.

[0010] Furthermore, a spring is sleeved on the outside of the air diffuser block, and the spring is fixedly installed in the groove. One end of the spring is fixedly connected to the side wall of the groove, and the other end is fixedly connected to the side wall of the limiting ring.

[0011] Furthermore, the crucible has a cavity inside, which is used to inject a cooling medium, and the cavity is spiral-shaped.

[0012] Furthermore, two connecting rods are symmetrically fixedly arranged on the outer wall of the heating vessel, and one end of each connecting rod is rotatably installed inside a vertical plate. A first motor is fixedly arranged on one side of one of the vertical plates, and the output shaft of the first motor is fixedly connected to the connecting rod.

[0013] Furthermore, two symmetrical sliding grooves are formed on the base plate, and a screw is rotatably installed in the sliding groove. The upper end of the limiting plate is arc-shaped, and a slider is fixedly connected to the bottom of the limiting plate. The slider is slidably installed in the sliding groove, and the screw passes through the slider and is threadedly connected to the slider.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In this graphite crucible for producing negative electrode materials, several gas dispersing blocks are slidably arranged on the sealing cover. During the production of negative electrode materials, when the gas pressure inside the crucible increases, it will lift the gas dispersing blocks to expose the gas dispersing grooves for venting. When the pressure decreases, the gas dispersing blocks move up and down slightly under the action of the spring and the gas pressure to dynamically adjust the exposed area of ​​the gas dispersing grooves. When the pressure is too low, the spring will reset the gas dispersing blocks, close the channels, and maintain the pressure inside the crucible.

[0016] 2. In this graphite crucible for producing negative electrode materials, a limiting plate is slidably set on the bottom plate. When the heating vessel is rotated after the negative electrode material production is completed, the second motor on the right is started first to drive the screw to move the right limiting plate to the left. When the heating vessel is close to being parallel with the bottom plate, the second motor on the left is started to move the left limiting plate to the right. The two limiting plates are in close contact with the outer wall of the heating vessel, which provides stable support and avoids excessive rotation. Attached Figure Description

[0017] Figure 1 This is one of the schematic diagrams of the overall structure of the graphite crucible for producing negative electrode materials in a preferred embodiment of this utility model;

[0018] Figure 2 This is the second schematic diagram of the overall structure of the graphite crucible for producing negative electrode materials in a preferred embodiment of this utility model;

[0019] Figure 3 This is a plan view of the crucible connection structure in a preferred embodiment of the present invention;

[0020] Figure 4 This is a preferred embodiment of the present invention. Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 5 This is a schematic diagram of the overall structure of the sealing cap in a preferred embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the overall structure of the gas dispersing block in a preferred embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the overall structure of the crucible in a preferred embodiment of the present invention;

[0024] Figure 8 This is a preferred embodiment of the present invention. Figure 7 Enlarged schematic diagram of the structure at point B.

[0025] Figure label:

[0026] 1. Base plate; 11. Vertical plate; 12. Slide groove; 13. First motor; 14. Screw; 15. Second motor;

[0027] 2. Crucible; 21. Notch; 22. Cavity; 23. Insert ring;

[0028] 3. Heating vessel; 31. Connecting rod; 32. Sealing ring;

[0029] 4. Sealing cover; 41. Fixing block; 42. Air diffuser block; 421. Limiting ring; 422. Air diffuser groove; 423. Filter plate; 43. Groove; 44. Spring; 45. Ring groove;

[0030] 5. Limiting plate; 51. Slider. Detailed Implementation

[0031] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0032] This embodiment provides a graphite crucible for producing negative electrode materials, including a base plate 1 and a crucible 2. Two upright plates 11 are symmetrically fixed on the base plate 1. A heating vessel 3 for heating the crucible 2 is fixedly connected to the outer wall of the crucible 2, and the heating vessel 3 is rotatably installed between the two upright plates 11. A sealing cover 4 is inserted and installed on the crucible 2. Several gas dispersing blocks 42 for realizing the function of gas discharge in the crucible 2 are slidably arranged inside the sealing cover 4. A notch 21 is opened on the inner wall of the open end of the crucible 2 for convenient pouring of materials. A limiting plate 5 for limiting the rotation angle of the heating vessel 3 is also symmetrically slidably arranged on the base plate 1.

[0033] like Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, a ring 23 is fixedly installed on the top of the crucible 2, and an annular groove 45 is opened at the bottom of the sealing cover 4. The ring 23 is inserted into the annular groove 45. By inserting the sealing cover 4, the sealing performance of the crucible 2 is ensured during the production of negative electrode materials, effectively preventing heat from being directly dissipated from the top of the crucible 2, avoiding unnecessary heat loss during the production process. Even if there is a small gap between the sealing cover 4 and the crucible 2 due to the high temperature environment inside the crucible 2, heat leakage must pass through the tortuous path formed by the ring 23 and the annular groove 45, greatly extending the heat leakage path length, thereby significantly reducing heat loss and greatly enhancing the stability of the entire production process; and the insertion of the ring 23 Magnetic blocks are fixedly installed on both the end and the side wall of the annular groove 45. The insertion ring 23 is inserted into the annular groove 45 and further magnetically fixed by the magnetic blocks, which enhances the sealing effect. A certain amount of pulling force is required to remove the sealing cover 4 to ensure that the sealing cover 4 will not be accidentally opened during normal production. Considering that the surface temperature of the crucible 2 is extremely high after the heating vessel 3 heats the crucible 2, it is easy for operators to be burned if they directly contact the crucible 2 or the sealing cover 4. A fixing block 41 is fixedly installed at the center of the top of the sealing cover 4. The fixing block 41 is made of special heat insulation material and has good heat insulation performance. It can effectively block the heat transferred from the crucible 2 to the sealing cover 4. Therefore, after the negative electrode material is produced, the fixing block 41 can be pulled to remove the sealing cover 4 from the crucible 2 to avoid burns.

[0034] like Figure 8 As shown, a sealing ring 32 is fixedly installed on the inner side of the upper end of the heating vessel 3. The sealing ring 32 is fixedly connected to the outer wall of the crucible 2, which effectively prevents the raw material from leaking into the gap between the heating vessel 3 and the crucible 2 when the crucible 2 is tilted to pour material, thus avoiding waste and pollution of the raw material. At the same time, it also reduces production interruption and equipment failure caused by raw material leakage.

[0035] like Figure 6As shown, the air diffuser block 42 is a hollow column. A limiting ring 421 is fixedly connected to the outer wall of the air diffuser block 42. Several air diffuser grooves 422 are formed in a ring array at the upper end of the air diffuser block 42. A filter plate 423 is fixedly installed at the bottom of the air diffuser block 42 to prevent particulate matter in the raw material from entering the air diffuser block 42 and causing blockage.

[0036] like Figure 3 and Figure 4 As shown, the sealing cover 4 has several slots, the gas dispersing block 42 is slidably installed in the slots, the bottom of the slots is connected to the internal space of the crucible 2, providing a channel for gas to enter the gas dispersing block 42 from the crucible 2, and the sealing cover 4 has several grooves 43 that are respectively connected to the slots, and the limiting ring 421 is slidably installed in the grooves 43.

[0037] like Figure 3 and Figure 4 As shown, a spring 44 is sleeved on the outside of the air diffuser block 42, and the spring 44 is fixedly installed in the groove 43. One end of the spring 44 is fixedly connected to the side wall of the groove 43, and the other end is fixedly connected to the side wall of the limiting ring 421.

[0038] like Figure 3 and Figure 4 As shown, gases, such as volatiles or other byproducts, are generated during the production of negative electrode materials. These gases accumulate inside crucible 2, causing the internal pressure of crucible 2 to gradually increase. When the gas pressure reaches a certain level, the pressure of the gas on the bottom of the gas diffuser block 42 overcomes the elastic force of the spring 44, pushing the gas diffuser block 42 upward. The gas diffuser block 42 moves upward along the slot, and the gas diffuser groove 422 at its upper end is gradually exposed to the outside. At this time, the gas inside crucible 2 begins to be discharged through the hollow gas diffuser block 42 and the gas diffuser groove 422. As the gas is continuously discharged, the internal pressure of crucible 2 gradually decreases, and the gas diffuser block 42 is subjected to the pressure of the gas and the elastic force of the spring 44. Under the combined action of the four elastic forces, the gas diffuser block 42 will move up and down slightly with the change of gas pressure. When the gas pressure drops slightly, the elastic force of the spring 44 will cause the gas diffuser block 42 to move downward a small distance, and the exposed area of ​​the gas diffuser groove 422 will decrease accordingly. When the gas pressure rises again, the gas diffuser block 42 will move upward again, and the exposed area of ​​the gas diffuser groove 422 will increase. After a certain amount of gas is discharged from the crucible 2, the internal pressure drops to a certain level. At this time, the elastic force of the spring 44 is greater than the pressure of the gas on the bottom of the gas diffuser block 42. Under the action of the spring 44, the gas diffuser block 42 moves downward to reset, and the gas diffuser groove 422 is blocked by the sealing cover 4 again, and the gas discharge channel is closed.

[0039] like Figure 3As shown, a cavity 22 is formed inside the crucible 2, which is used to inject a cooling medium, and the cavity 22 is spiral-shaped. During the production of the negative electrode material, the crucible 2 is in a heated state. At this time, the cavity 22 is not filled with a cooling medium to ensure that the crucible 2 can perform normal heating. When the production of the negative electrode material is completed, that is, the heating process of the crucible 2 is over, the cooling medium can be injected into the cavity 22. The cooling medium exchanges heat with the crucible 2 to cool the crucible 2, which facilitates the rapid cooling of the material. The continuity and uniformity of the spiral cavity 22 enable the cooling medium to flow uniformly in the cavity 22 and to exchange heat uniformly with the inner wall of the crucible 2. Therefore, all parts of the crucible 2 can be cooled evenly, avoiding problems such as deformation and cracking of the crucible 2 caused by uneven cooling, and extending the service life of the crucible 2; in addition, the top of the crucible 2 is provided with a liquid inlet and the bottom is provided with a liquid outlet, and both the liquid inlet and the liquid outlet are provided with sealing plugs. When the crucible 2 is cooled, the cooling medium is discharged through the liquid outlet, which passes through the heating vessel 3 and does not affect the discharge.

[0040] like Figure 2 As shown, two connecting rods 31 are symmetrically fixed on the outer wall of the heating vessel 3, and one end of each connecting rod 31 is rotatably installed in the vertical plate 11. A first motor 13 is fixedly installed on one side of one of the vertical plates 11, and the output shaft of the first motor 13 is fixedly connected to the connecting rod 31. After the negative electrode material is produced, the first motor 13 drives the connecting rod 31 to rotate, which drives the heating vessel 3 and the crucible 2 to rotate, causing the crucible 2 to tilt towards the notch 21. As the tilt angle increases, the material in the crucible 2 begins to flow towards the notch 21 under the action of gravity.

[0041] like Figure 1 and Figure 2As shown, two symmetrical grooves 12 are formed on the base plate 1. A screw 14 is rotatably installed in the groove 12. The upper end of the limiting plate 5 is arc-shaped and made of an elastic material, preferably silicone. A slider 51 is fixedly connected to the bottom of the limiting plate 5. The slider 51 is slidably installed in the groove 12, and the screw 14 passes through the slider 51 and is threadedly connected to it. A second motor 15 is fixedly connected to both sides of the base plate 1. The output shaft of the second motor 15 is fixedly connected to one end of each of the two screws 14. The second motor 15 drives the screws 14 to rotate, thereby causing the sliders 51 to slide in the groove 12, thus moving the limiting plate 5 on the base plate 1. The heating vessel 3 is vertical. In the straight state, the two limiting plates 5 are located in the sliding groove 12 near the two ends of the bottom plate 1. At this time, the limiting plates 5 maintain a certain distance from the outer wall of the heating vessel 3, providing sufficient space for the rotation of the heating vessel 3. After the negative electrode material is produced, the heating vessel 3 needs to be rotated. At this time, the right limiting plate 5 needs to be gradually slid to the left. When the heating vessel 3 is rotated to the point where the bottom plate 1 is close to parallel, the left limiting plate 5 is gradually slid to the right until the heating vessel 3 is tilted to a suitable angle. At this time, the two limiting plates 5 are in close contact with the outer wall of the heating vessel 3, which can provide stable support for the heating vessel 3 and prevent it from rotating excessively. In addition, the silicone material at the upper end of the limiting plates 5 can effectively prevent wear on the surface of the heating vessel 3.

[0042] In practical use, the raw material for the negative electrode to be produced is loaded into the crucible 2. After the raw material is filled, the bottom of the sealing cap 4 is aligned with the top of the crucible 2, and the insert ring 23 is inserted into the ring groove 45. The sealing cap 4 is fixed to the crucible 2 by the magnetic force of the magnetic block. The heating vessel 3 is then started to heat the crucible 2. During the production of the negative electrode material, gas will be generated in the crucible 2. When the gas pressure reaches a certain level, it will overcome the elastic force of the spring 44 and push the gas dispersing block 42 upward. As the gas gradually becomes exposed, it exits the crucible 2 through the gas diffuser block 42 and the gas diffuser groove 422. With the gas exiting, the pressure inside the crucible 2 decreases. Under the combined action of the spring force 44 and the gas pressure, the gas diffuser block 42 automatically adjusts the exposed area of ​​the gas diffuser groove 422 to maintain stable pressure inside the crucible 2. When a certain amount of gas has exited, the spring force 44 exceeds the gas pressure, causing the gas diffuser block 42 to move downwards and reset, closing the gas exit channel. After the negative electrode material production is completed, the heating vessel 3 is shut off, and the process is stopped. Heating crucible 2 involves injecting a cooling medium into its cavity 22. After crucible 2 and its negative electrode material cool, the cooling medium is discharged through the outlet. Pulling the fixing block 41 removes the sealing cap 4 from crucible 2. Subsequently, controlling the first motor 13 drives the connecting rod 31 to rotate, causing the heating vessel 3 and crucible 2 to rotate, tilting crucible 2 towards the notch 21. During rotation, the second motor 15 on the right drives the screw 14 on the right to rotate, causing the limiting plate 5 on the right to gradually move to the left. When the heating vessel 3 rotates to a position where the bottom plate 1 is nearly parallel, the second motor 15 on the left is activated, driving the screw 14 on the left to rotate, causing the limiting plate 5 on the left to gradually move to the right. As the heating vessel 3 rotates, the two limiting plates 5 are in close contact with the outer wall of the heating vessel 3, providing stable support for the heating vessel 3 and preventing excessive rotation. When the heating vessel 3 tilts to a suitable angle, the material inside crucible 2 begins to flow towards the notch 21 under the action of gravity and is poured out of crucible 2.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A graphite crucible for producing negative electrode material, comprising a bottom plate (1) and a crucible (2), two vertical plates (11) are symmetrically fixed on the bottom plate (1), characterized in that, The outer wall of the crucible (2) is fixedly connected to a heating vessel (3) for heating the crucible (2), and the heating vessel (3) is rotatably installed between two vertical plates (11). A sealing cover (4) is inserted and installed on the crucible (2). Several gas dispersing blocks (42) for realizing the function of gas discharge in the crucible (2) are slidably arranged inside the sealing cover (4). A notch (21) is opened on the inner wall of the opening end of the crucible (2) for convenient pouring of materials. A limiting plate (5) for limiting the rotation angle of the heating vessel (3) is also symmetrically slidably arranged on the bottom plate (1).

2. The graphite crucible for negative electrode material production according to claim 1, characterized by, The crucible (2) is fixedly provided with a plug ring (23) at the top, and the sealing cover (4) is provided with an annular groove (45) at the bottom, and the plug ring (23) is inserted into the annular groove (45).

3. The graphite crucible for negative electrode material production according to claim 1, characterized by, The air diffuser block (42) is a hollow column. A limiting ring (421) is fixedly connected to the outer wall of the air diffuser block (42). Several air diffuser grooves (422) are opened in a ring array at the upper end of the air diffuser block (42). A filter plate (423) is fixedly installed at the bottom of the air diffuser block (42).

4. The graphite crucible for negative electrode material production according to claim 3, characterized by, The sealing cover (4) has several slots, the air diffuser (42) is slidably installed in the slots, and the sealing cover (4) has several grooves (43) that are respectively connected to the slots, and the limiting ring (421) is slidably installed in the grooves (43).

5. The graphite crucible for negative electrode material production according to claim 3, characterized by, A spring (44) is sleeved on the outside of the air dispersing block (42), and the spring (44) is fixedly installed in the groove (43). One end of the spring (44) is fixedly connected to the side wall of the groove (43), and the other end is fixedly connected to the side wall of the limiting ring (421).

6. The graphite crucible for producing negative electrode materials according to claim 1, characterized in that, The crucible (2) has a cavity (22) inside, which is used to inject a cooling medium, and the cavity (22) is spiral in shape.

7. The graphite crucible for production of a negative electrode material according to claim 1, characterized by, Two connecting rods (31) are symmetrically fixed on the outer wall of the heating vessel (3), and one end of each connecting rod (31) is rotatably installed in the vertical plate (11). A first motor (13) is fixedly installed on one side of one of the vertical plates (11), and the output shaft of the first motor (13) is fixedly connected to the connecting rod (31).

8. The graphite crucible for production of a negative electrode material according to claim 1, characterized by, Two symmetrical grooves (12) are provided on the base plate (1). A screw (14) is rotatably installed in the groove (12). The upper end of the limiting plate (5) is arc-shaped. A slider (51) is fixedly connected to the bottom of the limiting plate (5). The slider (51) is slidably installed in the groove (12). The screw (14) passes through the slider (51) and is threadedly connected to the slider (51).

Images