Superfine powder filling machine and graphitization furnace comprising same

Abstract

The invention provides an ultrafine powder filling machine and a graphitization furnace comprising the ultrafine powder filling machine, and the ultrafine powder filling machine comprises a blanking hopper which is arranged at the upper end part of an outer shell and is used for downwards conveying and forcibly downwards feeding powder; the material collecting cover is mounted at the lower end part of the outer shell and is used for collecting the compressed powder; the multiple stages of roller pairs are sequentially arranged from top to bottom along the inner wall face of the outer shell, and each stage of roller pair comprises at least two rollers rotating oppositely; the driving device is connected with the roller pair and used for driving the roller pair to rotate; a cavity is formed between the roller pair and the discharging hopper, and the vacuumizing device is installed at the position of the cavity and used for pumping out gas in powder and enabling negative pressure to be formed in a working area. In the negative pressure state, a double-roller step-by-step compression mode is adopted, so that gas is discharged more easily in the ultrafine powder compression process, and the compression efficiency is improved. According to the crucible, the filling amount of the negative electrode material in the crucible can be greatly increased, so that the power consumption of the graphitization process of the negative electrode material is effectively reduced, and the graphitization production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of graphitization furnace production, and in particular to an ultrafine powder filling machine and a graphitization furnace comprising the same. Background Art

[0002] In recent years, with the implementation of China's new energy policies, lithium batteries have become widely used in automobiles, energy storage, and other applications. However, the production of lithium batteries requires a large amount of positive and negative electrode materials. These materials are the primary components of lithium batteries and contribute significantly to their production costs.

[0003] Currently, the production of lithium battery anode materials requires converting carbonaceous materials into graphite at temperatures exceeding 2500°C. During the graphitization process, a carbon-graphite crucible is loaded into a graphitization furnace and subjected to high temperatures for graphitization, transforming the carbon powder into graphite powder. The graphitization process typically consumes 8000 kW of electricity per ton of anode material. Therefore, graphitization of anode materials is a highly energy-intensive industrial process.

[0004] In existing graphitization production methods for negative electrode materials, the primary equipment used is a graphitization furnace, equipped with a graphitization transformer power supply. During this process, the negative electrode material is first loaded into a dedicated graphite crucible. This crucible is then placed into the graphitization furnace. Next, electricity is supplied to the furnace, raising the temperature to above 2500°C to complete the conversion of the material into graphite.

[0005] During the entire graphitization process, the negative electrode material is ultrafine coke powder, which has a very fine particle size. Each graphitization furnace can only hold a certain number of crucibles. The amount of negative electrode material loaded into each crucible, along with the number of crucibles, determines the furnace's loadout. Therefore, the power consumption and production costs of each furnace's graphitization process are essentially constant and have little to do with the amount of material loaded into the crucible. The amount of negative electrode material loaded into the crucible directly impacts these costs.

[0006] For example, in actual production, due to the ultra-fine particle size of the negative electrode material, which is often below 20μm, it is difficult to expel the air in the powder when filling the negative electrode material into the graphite crucible, resulting in a low filling density of the powder in the crucible, ranging from 0.85-0.95g / cm 3 , specific theoretical density 2.36g / cm 3 There is a big difference. When the packing density is 0.9g / cm 3 At this time, the graphitization power consumption is 8000kw / ton of product, and the graphitization production cost is 8500 yuan / ton.

[0007] However, the crucible for holding negative electrode powder needs to withstand temperatures exceeding 2500°C, making it the only choice for graphite crucibles. Graphite crucibles have low mechanical strength and are easily damaged by high-power, high-pressure, and high-vibration powder loading machinery, making them unsuitable for negative electrode powder filling production.

[0008] Therefore, in order to reduce graphitization power consumption and reduce graphitization production costs, increasing the amount of negative electrode material filled in the crucible as much as possible is the most direct way to reduce power consumption and costs. In actual production, the amount of powder filled in each crucible does not affect the total production cost of graphitization for that furnace. However, the production cost of negative electrode powder graphitization per unit weight is calculated by dividing the total graphitization cost for that furnace by the total amount of powder in all crucibles in that furnace.

[0009] In view of this, the inventors of the present application have designed an ultrafine powder filling machine and a graphitization furnace including the same, in order to overcome the above technical problems. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the defects of the prior art in which negative electrode materials are filled in a graphite crucible, gas discharge is difficult during ultrafine powder compression, and compression efficiency is low, and an ultrafine powder filling machine and a graphitization furnace including the same are provided.

[0011] The present invention solves the above technical problems through the following technical solutions:

[0012] A superfine powder filling machine is characterized in that the superfine powder filling machine comprises:

[0013] A lower hopper and an outer shell, wherein the lower hopper is mounted on the upper end of the outer shell and is used to convey powder downward;

[0014] A collecting cover is installed at the lower end of the outer shell and is used to collect compressed powder;

[0015] Multiple stages of rollers are arranged sequentially from top to bottom along the inner wall of the outer shell, and each stage of rollers includes at least two rollers rotating in opposite directions, which are used to compress the powder downward and force it to be transported downward;

[0016] a driving device connected to the pair of rollers, for driving the pair of rollers to rotate and compress and transport the powder;

[0017] A vacuum pumping device is provided, wherein a cavity is formed between the pair of rollers and the lower hopper, and the vacuum pumping device is installed in the cavity to extract the gas in the powder and form a negative pressure in the working area.

[0018] According to one embodiment of the present invention, the distance between the rollers of each level of rollers decreases from top to bottom. Among two adjacent levels of rollers, the distance between the rollers of the next level of rollers is 2% to 15% smaller than the distance between the rollers of the previous level of rollers.

[0019] According to one embodiment of the present invention, the ultrafine powder filling machine includes at least five stages of rollers.

[0020] According to one embodiment of the present invention, the particle size of the powder is less than or equal to 50 microns. According to one embodiment of the present invention, the powder is lithium battery negative electrode powder, ultrafine carbon black or plant wall-broken powder.

[0021] According to one embodiment of the present invention, the roller is a cylinder, and a rack is provided on the surface of the cylinder in a tooth shape.

[0022] According to one embodiment of the present invention, the surface of the rack is a plane or an arc surface, the racks are arranged on the surface of a cylinder, and have a star-shaped cross section.

[0023] According to one embodiment of the present invention, a pressure sensor is installed in the collecting cover to collect filling information and transmit it to a control system, and the filling density of the powder is adjusted by the control system.

[0024] According to one embodiment of the present invention, the rollers of the pair of rollers are respectively installed in the outer shell through rotating shafts, and the rollers in each row from top to bottom are connected by a chain. The driving device is connected to the rotating shaft of the uppermost pair of rollers, and the uppermost pair of rollers is driven to rotate by the driving device, and the chain drives the remaining pairs of rollers to rotate together.

[0025] According to one embodiment of the present invention, multiple rows of guide posts are further provided on the outer shell, the guide posts are located on both sides of the pair of rollers, and the chain is clamped between the guide posts and the rotating shafts of the pair of rollers.

[0026] The present invention also provides a graphitization furnace, which is characterized in that the graphitization furnace includes at least one ultrafine powder filling machine, a feeding and storage system and a plurality of powder containers as described above, the ultrafine powder filling machine is installed in the powder container, and the feeding and storage system is installed above the ultrafine powder filling machine for conveying powder to the lower hopper.

[0027] The positive progress effect of the present invention is:

[0028] The ultrafine powder filling machine of the present invention and the graphitization furnace including the same have the following advantages:

[0029] 1. The roller compression method is adopted under negative pressure, which makes it easier to discharge gas during the ultrafine powder compression process, thereby improving the compression efficiency;

[0030] 2. When ultrafine powder is compressed, it will not cause impact or damage to the container;

[0031] 3. The equipment has a simple structure, is easy to manufacture, maintain and operate, and has a low cost;

[0032] 4. Greatly increase the amount of negative electrode material filled in the crucible, thereby effectively reducing the power consumption of the graphitization process of the negative electrode material and reducing the graphitization production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which like reference numerals represent like features throughout, wherein:

[0034] Figure 1 It is a structural schematic diagram of the ultrafine powder filling machine of the present invention.

[0035] Figure 2 for Figure 1 Cross-sectional view taken along line AA.

[0036] Figure 3 It is a side view of the ultrafine powder filling machine of the present invention.

[0037] Figure 4 This is a schematic diagram of the installation of the chain in the ultrafine powder filling machine of the present invention.

[0038] Figure 5 It is a schematic diagram of the side internal structure of the ultrafine powder filling machine of the present invention.

[0039] Figure 6 It is a working schematic diagram of the ultrafine powder filling machine of the present invention.

[0040] Figure 7 Schematic diagram of the structure of the graphitization furnace of the present invention.

[0041] Reference numerals

[0042] Lower hopper 10

[0043] Outer shell 20

[0044] Collection cover 30

[0045] Roller 40

[0046] Drive device 50

[0047] Vacuum equipment 60

[0048] Powder 70

[0049] Roller 41

[0050] Chain 80

[0051] Rotating shaft 42

[0052] Guide column 90

[0053] Cavity 11

[0054] Ultrafine powder filling machine 100

[0055] Feeding and storage system 200

[0056] Multiple powder containers 300 DETAILED DESCRIPTION

[0057] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0058] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0059] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein.

[0060] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings lying behind each term.

[0061] like Figure 1 and Figure 2 As shown, the present invention discloses an ultrafine powder filling machine, comprising: a lower hopper 10, an outer shell 20, a collecting cover 30, a multi-stage roller 40, a driving device 50 and a vacuum device 60. The lower hopper 10 is installed at the upper end of the outer shell 20 for conveying powder 70 downward.

[0062] A collection hood 30 is mounted at the lower end of the outer shell 20 to collect the compressed powder 70. The size and shape of the collection hood 30 are determined by the size and shape of the powder container (e.g., a crucible). When the rotating rollers 40 deliver the powder 70 into the container, the collection hood 30 prevents the powder from being blown away.

[0063] In addition, a pressure sensor can be installed on the collecting cover 30. The pressure sensor can collect and transmit the sensed pressure and filling information to the equipment control system (such as a control computer). The equipment control system then controls the filling machine to move upward and controls the density of the powder filling by adjusting the pressure, that is, adjusting the powder filling density through the control system.

[0064] Preferably, the particle size of the powder 70 in this application is set to be less than or equal to 50 microns, for example, preferably 10 to 20 microns, or preferably 30 microns, which can meet the requirements of the technical solution of this application. In addition, the powder 70 can be selected from lithium battery negative electrode powder, ultrafine carbon black, or plant wall-broken powder.

[0065] Here, when the powder 70 is preferably lithium battery negative electrode powder, the particle size of the lithium battery negative electrode powder can be preferably 3 microns to 30 microns, and is fed into the lower hopper 10 through the feeding device. Of course, the powder 70 can also adapt to other micron-level ultrafine powders with lower specific gravity, such as ultrafine carbon black and plant wall-broken powder.

[0066] The multiple stages of rollers 40 are arranged sequentially along the inner wall of the outer shell 20 from top to bottom. Each stage of rollers 40 includes at least two rollers 41 rotating in opposite directions (for example, in this embodiment, two rollers are arranged opposite each other). The rollers 41 rotate in opposite directions, conveying the loose powder 70 downward while compressing the powder 70. For example, in a first stage of rollers 40, the roller 41 on the left rotates clockwise, while the roller 41 on the right rotates counterclockwise, compressing the powder 70 in the gap between the two rollers. After the powder 70 undergoes initial compression by the topmost first stage of rollers 40, its bulk density increases compared to the bulk density of the powder in the lower hopper 10. Each subsequent stage of rollers 40 further compresses the initially compressed powder 70 and forcibly conveys it downward. This multi-stage roller structure achieves a superior compression effect. Finally, the powder, after multi-stage compression, is collected below the collection hood 30 and filled into the container.

[0067] Each roller 41 is preferably configured as a cylinder, with a rack on the surface of the cylinder in a toothed shape. In particular, the surface of the rack can be configured as a plane or an arc surface, and the racks are arranged on the surface of the cylinder, with a star-shaped cross-section. When the tooth grooves of the roller 41 face upward, the powder 70 is filled in, and when it rotates to intersect with the teeth of the opposite roller, the powder is compressed. When it rotates again, the tooth grooves press the compressed powder downward. The multi-stage relatively rotating toothed rollers 41 squeeze out the gas in the ultrafine powder 70 flowing from top to bottom, and after reaching a certain density, fill it into the container below.

[0068] Preferably, the distances between the rollers 41 of the roller pairs 40 at each level decrease from top to bottom.

[0069] Further preferably, between two adjacent roller pairs 40, the spacing between the rollers 41 of the next roller pair 40 is 2% to 15% smaller than the spacing between the rollers 41 of the previous roller pair 40. For example, in this embodiment, the spacing between the rollers 41 of the next roller pair 40 is 5% smaller than the spacing between the rollers 41 of the previous roller pair 40. For example, in this embodiment, the tooth height of the first roller pair 40 is preferably greater than 20 mm, the spacing between the rollers 40 of the previous roller pair 40 is approximately 5 mm greater than that of the next roller pair 40, and the spacing between the rollers 40 of the last roller pair 40 is approximately 10 mm. The bottom of the outer shell 20 is configured as a curved plate to match the last roller pair 40.

[0070] This allows the gaps between the rollers 41 of each stage 40 to gradually decrease from top to bottom, until the two rollers 41 of the last stage 40 are meshed or very close to each other. The multiple stages 40 are arranged from top to bottom, with the gaps between the rollers 41 of the next stage 40 gradually decreasing compared to the gaps between the rollers 41 of the previous stage 40. This ensures graded compression of the powder while forcing it downward.

[0071] Preferably, the gap between the multi-stage roller pairs 40 can be adjusted in two ways: First, rollers of the same size are used to directly adjust the gap between the rollers of each stage. Second, rollers of different sizes are designed, and the gap between the rollers of each stage is changed by adjusting the diameter of the rollers of each stage and the installation position of the roller's rotating shaft during installation.

[0072] In addition, the number of compression rollers 40 can be determined according to a predetermined degree of compression. For the crucible filling of negative electrode materials, it is more reasonable to use more than 5 levels. For example, in this embodiment, 7 levels of rollers are used. Since there is a large amount of gas (such as air) in the powder 70, it is difficult to squeeze out the gas at one time. Therefore, the present application uses multiple levels of rollers to slowly extrude the powder step by step. Each level of rollers squeezes the powder in turn, compressing the powder while conveying it downward, thereby maximizing the discharge of gas from the powder.

[0073] like Figures 3 to 5 As shown, a drive device 50 is connected to the rollers 40 to drive the rollers 40 to rotate and compress and convey the powder 70. Preferably, the rollers 41 of each stage of rollers 40 are mounted on the side walls of the outer shell 20 (e.g., a square outer shell) via rotational shafts 42, and the rollers 41 are installed within the outer shell 20. In the longitudinal direction, the rollers 41 in each column from top to bottom are connected by a chain 80, which connects the drive device 50 to the rotational shaft 42 of the uppermost roller 40 (i.e., the first stage of rollers).

[0074] In this embodiment, each stage of rollers 40 is equipped with two rollers that rotate relative to each other. The multiple stages of rollers 40 form two rows of rollers 41, each row of rollers 41 linked vertically by a chain 80. The drive device 40 is also connected to the rotating shafts of the rollers of the topmost first-stage roller pair via a chain. When the drive device 50 rotates the topmost roller pair 40 (i.e., the first-stage roller pair), the chain 80 drives the remaining multi-stage roller pairs 40 to rotate as well. This allows a single drive device 50 to simultaneously drive all multi-stage roller pairs 40.

[0075] In addition, multiple rows of guide posts 90 are provided on the outer shell 20 . The guide posts 90 are disposed on both sides of the pair of rollers 40 , and the chain 80 is clamped between the guide posts 90 and the rotation shafts of the pair of rollers.

[0076] like Figure 6 As shown, as the multi-stage rollers 40 compress the powder 70 and convey it downward, the vacuum device 60 simultaneously extracts gas (e.g., air) from the outer shell 20, creating a certain negative pressure within the working area. A cavity 11 is formed between the rollers 40 and the lower hopper 10. The multi-stage rollers 40 compress the powder 70 and expel gas (e.g., air) from the powder 70 into the cavity 11.

[0077] For example, in this embodiment, the vacuuming device 60 preferably includes a vacuum tube and a vacuuming system. One end of the vacuum tube is connected to the cavity 11, and the other end is connected to the vacuuming system.

[0078] A vacuum pump 60 is installed in cavity 11, creating a negative pressure within the cavity. This removes the gas expelled by the multi-stage rollers 40 during extrusion. In actual use, the entire system maintains a negative pressure of approximately 10,000 Pa. The removed gas, which contains a significant amount of negative electrode powder, is separated by the gas-solid separation equipment and then returned to the upper hopper 10.

[0079] In fact, for solid materials, the conventional tool for compaction is a press. The press applies pressure to the powder from top to bottom through the pressure head, which is the most effective and direct means of operation. However, this application is aimed at ultrafine powder, because the powder is very fluffy and has an air content of more than 50%. This results in the press being unable to compact the powder during the actual compaction process. Once the press applies pressure to the powder, the air inside needs to be discharged, and a channel is required. Therefore, the press mold cannot be completely sealed, resulting in the powder and air being discharged together.

[0080] Therefore, the present invention uses multiple rollers to compress the powder step by step, gradually and fully discharging the gas (such as air) in the powder into the upper cavity. The compressed powder is then transported downward as the rollers rotate. At the same time, a vacuum device is used to create a negative pressure in the cavity, thereby extracting the air from the cavity and achieving separation of the air and powder.

[0081] During operation, the ultrafine powder filling machine described herein performs vacuuming and filling simultaneously. Powder is conveyed from top to bottom, with each stage of rollers compressing the powder by a small amount or a certain percentage. The compression at each stage is small, so air in the powder is forced out by external forces. A vacuum pump is also added to help exhaust the air.

[0082] like Figure 7 As shown, the present invention further provides a graphitization furnace, comprising at least one ultrafine powder filling machine 100, a loading and storage system 200, and a plurality of powder containers 300 (e.g., crucibles or crucible moving platforms) as described above. The ultrafine powder filling machine 100 is installed within the powder containers 300. In actual production, the ultrafine powder filling machine 100 is inserted into the powder containers 300, with the collection cover 30 making contact with the bottom of the powder containers 300 as much as possible, before the filling operation begins. The loading and storage system 200 is installed above the ultrafine powder filling machine 100 and is used to convey powder 70 to the lower hopper 10.

[0083] In summary, the ultrafine powder filling machine of the present invention and the graphitization furnace including the same have the following advantages:

[0084] 1. The use of roller-step compression makes it easier to discharge gas during the ultrafine powder compression process, thereby improving compression efficiency.

[0085] 2. When ultrafine powder is compressed, it will not cause impact or damage to the container.

[0086] 3. The equipment has a simple structure, is easy to manufacture, maintain, repair and operate, and has a low cost. The cost of the ultrafine powder filling machine of this application is only half of the existing filling equipment in the industry to achieve the same filling output.

[0087] 4. Greatly increase the amount of negative electrode material filled in the crucible, thereby effectively reducing the power consumption of the graphitization process of the negative electrode material and reducing the graphitization production cost.

[0088] 5. High production efficiency and obvious compression effect. Compared with the existing vibration, vacuum, mechanical pressing and manual tamping methods, the compaction density is increased by 0.3g / cm 3 above.

[0089] 6. For the same graphitization furnace production, the output can be increased by more than 30% through the crucible filling density, and the power consumption and production cost of the negative electrode powder graphitization process can be reduced by 30%. The existing power consumption of negative electrode material graphitization is reduced from 8000 degrees / ton to below 6000 degrees, and the production cost is reduced from 8500 yuan / ton to below 6000 yuan / ton.

[0090] For those skilled in the art, the above invention disclosure is intended only as an example and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to this application. Such modifications, improvements, and amendments are suggested in this application and remain within the spirit and scope of the exemplary embodiments of this application.

[0091] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0092] Similarly, it should be noted that, in order to simplify the description of the present disclosure and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of the present disclosure sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of the present disclosure requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than the total features of a single embodiment disclosed above.

[0093] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. An ultrafine powder filling machine, characterized in that: The ultrafine powder filling machine comprises: A lower hopper and an outer shell, wherein the lower hopper is mounted on the upper end of the outer shell and is used to convey powder downward; A collecting cover is installed at the lower end of the outer shell and is used to collect compressed powder; Multiple stages of rollers are arranged sequentially from top to bottom along the inner wall of the outer shell, and each stage of rollers includes at least two rollers rotating in opposite directions, which are used to compress the powder downward and force it to be transported downward; a driving device connected to the pair of rollers, for driving the pair of rollers to rotate and compress and transport the powder; A vacuum pumping device is provided, wherein a cavity is formed between the pair of rollers and the lower hopper, and the vacuum pumping device is installed in the cavity to extract the gas in the powder and form a negative pressure in the working area.

2. The ultrafine powder filling machine according to claim 1, characterized in that: The distance between the rollers of each level is reduced from top to bottom. Among two adjacent levels of rollers, the distance between the rollers of the next level is reduced by 2% to 15% than the distance between the rollers of the previous level.

3. The ultrafine powder filling machine according to claim 1, characterized in that: The ultrafine powder filling machine includes at least five stages of rollers.

4. The ultrafine powder filling machine according to claim 1, characterized in that: The particle size of the powder is less than or equal to 50 microns.

5. The ultrafine powder filling machine according to claim 1, characterized in that: The powder material is lithium battery negative electrode powder, ultrafine carbon black or plant wall-broken powder.

6. The ultrafine powder filling machine according to claim 1, characterized in that: The roller is a cylinder, and the surface of the cylinder is provided with a rack in a tooth shape.

7. The ultrafine powder filling machine according to claim 6, characterized in that: The surface of the rack is a plane or an arc surface, the racks are arranged on the surface of the cylinder, and the cross section is star-shaped.

8. The ultrafine powder filling machine according to claim 1, characterized in that: A pressure sensor is installed in the collecting cover to collect filling information and transmit it to a control system, which is used to adjust the filling density of the powder.

9. The ultrafine powder filling machine according to claim 1, characterized in that: The rollers of the pair of rollers are respectively installed in the outer shell through rotating shafts. The rollers in each row from top to bottom are connected by a chain. The driving device is connected to the rotating shaft of the top pair of rollers. The top pair of rollers is driven to rotate by the driving device, and the chain drives the remaining pairs of rollers to rotate together.

10. The ultrafine powder filling machine according to claim 9, characterized in that: The outer shell is further provided with multiple rows of guide posts, which are located on both sides of the pair of rollers, and the chain is clamped between the guide posts and the rotating shafts of the pair of rollers.

11. A graphitization furnace, characterized in that: The graphitization furnace comprises at least one ultrafine powder filling machine, a feeding and storage system, and a plurality of powder containers as described in any one of claims 1 to 10, wherein the ultrafine powder filling machine is installed in the powder container, and the feeding and storage system is installed above the ultrafine powder filling machine for conveying powder to a lower hopper.

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