Graphitization furnace
By designing electrodes with protruding and concave arc-shaped structures in the graphitization furnace, a parallel electric field is formed, which solves the problem of uneven heating of materials, realizes complete graphitization of materials and improves product consistency, and extends the service life of electrodes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-03
AI Technical Summary
In existing graphitization furnaces, uneven electric fields or insufficient heating times lead to reduced consistency in graphitized products.
A graphitization furnace is designed by setting a first electrode and a second electrode in the material channel. The side of the first electrode facing the second electrode has a convex arc surface structure, and the side of the second electrode facing the first electrode has a concave arc surface structure, forming a parallel electric field. This optimizes the electrode feeding channel design, reduces electrode wear, and improves the uniformity of electric field distribution.
It improves the consistency of material heating, ensures complete graphitization of materials, extends electrode lifespan, and enhances the consistency of graphitized products.
Smart Images
Figure CN223965876U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of graphitization technology, and in particular to a graphitization furnace. Background Technology
[0002] Currently, lithium-ion batteries are widely used in electric vehicles, consumer electronics, and other fields due to their high energy density and long lifespan. A graphitization furnace is a device that utilizes the resistive properties of materials, applying an electric field through electrodes to the materials within the furnace, causing them to generate heat and undergo a high-temperature reaction during the energization process, thus graphitizing the materials. For example, the materials can be used as negative electrode materials for batteries.
[0003] In some embodiments, when materials are heated in a graphitization furnace, uneven electric field or insufficient heating time may result in incomplete graphitization of the materials, reducing the consistency of the graphitized products. Utility Model Content
[0004] Therefore, it is necessary to provide a graphitization furnace to address the problem of reduced product consistency caused by incomplete graphitization of materials in existing graphitization furnaces.
[0005] A graphitization furnace includes a furnace body, a first electrode, and a second electrode. A material channel is provided inside the furnace body. The first electrode is arranged around the material channel, and the second electrode has the opposite polarity to the first electrode. The second electrode is arranged around the material channel and is spaced apart from the first electrode along a first direction, which is the axial direction of the material channel. The first electrode has a first feeding channel, and the second electrode has a second feeding channel. The side of the first electrode facing the second electrode is constructed as a convex arc surface structure along the direction close to the second electrode, and the side of the second electrode facing the first electrode is constructed as a concave arc surface structure along the direction away from the first electrode. In the aforementioned graphitization furnace, the material in the material channel flows sequentially through the first feeding channel and the second feeding channel before being discharged. That is, the material in the material channel passes sequentially through the feeding channels of each electrode. Since the side of the first electrode facing the second electrode is constructed as a convex arc surface structure along the direction close to the second electrode, and the side of the second electrode facing the first electrode is constructed as a concave arc surface structure along the direction away from the first electrode, it is beneficial to form a parallel electric field between the first conductive ring and the second conductive ring, which improves the uniformity of the electric field distribution between the first electrode and the second electrode, improves the consistency of material heating, and enables the material to be completely graphitized, which is beneficial to improving the consistency of graphitized products. In addition, the setting of the electrode feeding channels can reduce the wear of the material on the lower outer surface of the electrode, which is beneficial to improving the service life of the electrode.
[0006] In some embodiments, the first electrode includes a first conductive ring, and the side of the first electrode facing the second electrode is a fifth surface of the first conductive ring; the second electrode includes a second conductive ring, and the side of the second electrode facing the first electrode is a sixth surface of the second conductive ring; the fifth surface is constructed as a downwardly convex arcuate structure, and the sixth surface is constructed as a downwardly concave arcuate structure, with the curvature of the fifth and sixth surfaces being consistent. This facilitates the formation of a parallel electric field between the first and second conductive rings, improves the uniformity of the electric field distribution between the first and second electrodes, enhances the consistency of material heating, enables complete graphitization of the material, and improves the consistency of the graphitized product.
[0007] In some embodiments, the first conductive ring has a first surface and a second surface disposed opposite to each other along a first direction, the second surface being connected to a fifth surface, and a first feeding channel extending from the first surface to the second surface along the first direction. This allows the first feeding channel to be smoothly positioned on the first electrode, enabling material to flow through the first feeding channel along the first direction and improving the uniformity of material feeding.
[0008] In some embodiments, the ratio of the outer diameter to the inner diameter of the first conductive ring is 1.4 to 9. Thus, by limiting the ratio of the inner and outer diameters of the first conductive ring, the space occupied by the first feeding channel and the overall space occupied by the first conductive ring can be limited, reducing the probability of flow deviation while rationally designing the volume of the first conductive ring, which helps improve the uniformity of material feeding and heating consistency.
[0009] In some embodiments, the ratio of the outer diameter to the inner diameter of the first conductive ring is 1.4 to 2.5. This ratio is within an optimal range, further reducing the probability of flow deviation while optimizing the volume of the first conductive ring. This improves the uniformity of material feeding and heating consistency, enabling complete graphitization of the material.
[0010] In some embodiments, the first electrode further includes at least one pair of first electrode posts, with two first electrode posts in each pair distributed on both sides of the material channel along a second direction. Each first electrode post surrounds the outer periphery of the first conductive ring and extends along the second direction, which is the radial direction of the material channel. Thus, the first electrode includes paired first electrode posts, which increases the electric field distribution range between the first and second electrodes, improves the uniformity of the electric field distribution between the first and second electrodes, and makes the material heated more evenly in the furnace, thereby improving the consistency of the graphitized product.
[0011] In some embodiments, each first electrode post is constructed as a solid columnar structure. This allows for a more concentrated distribution of the electric field between the first and second electrodes, improving the uniformity of the electric field distribution and resulting in more uniform heating of the material within the furnace, thereby enhancing the consistency of the graphitized product.
[0012] In some embodiments, the second conductive ring has a third surface and a fourth surface disposed opposite to each other along a first direction, the fourth surface being connected to a sixth surface, and the second feeding channel extending from the third surface to the fourth surface along the first direction. This allows the first feeding channel to be smoothly positioned on the second electrode, enabling material to flow through the second feeding channel along the first direction, thus improving the uniformity of material feeding. In some embodiments, the ratio of the outer diameter to the inner diameter of the second conductive ring is 1.15 to 5.5. Thus, by limiting the ratio of the inner and outer diameters of the second conductive ring, the space occupied by the second feeding channel and the overall space occupied by the second conductive ring can be limited, reducing the probability of flow deviation while rationally designing the volume of the second conductive ring, which is beneficial for improving the uniformity of material feeding and heating consistency.
[0013] In some embodiments, the ratio of the outer diameter to the inner diameter of the second conductive ring is 1.15 to 2.5. This ratio is within an optimal range, further reducing the probability of flow deviation while optimizing the volume of the second conductive ring. This improves the uniformity of material feeding and heating consistency, enabling complete graphitization of the material.
[0014] In some embodiments, the ratio of the inner diameter of the second conductive ring to the inner diameter of the first conductive ring is 1.0 to 7.5. Thus, by limiting the ratio of the inner diameters of the second and first conductive rings, materials can be smoothly fed from the first and second feeding channels, which helps improve the uniformity of material feeding and the consistency of heating.
[0015] In some embodiments, the ratio of the inner diameter of the second conductive ring to the inner diameter of the first conductive ring is 1.0 to 2.3. This ratio is within an optimal range, further improving the uniformity of material feeding and heating consistency, enabling complete graphitization of the material.
[0016] In some embodiments, the distance between the second conductive ring and the first conductive ring in the first direction is 1.1 mm to 5.5 mm. Thus, by limiting the distance between the second conductive ring and the first conductive ring in the first direction, the range of electric field distribution between the second conductive ring and the first conductive ring can be optimized.
[0017] In some embodiments, the second electrode further includes at least one pair of second electrode posts, with two second electrode posts in each pair distributed on both sides of the material channel along a second direction. Each second electrode post surrounds the outer periphery of the second conductive ring and extends along the second direction, which is the radial direction of the material channel. Thus, the second electrode, including paired second electrode posts, can increase the electric field distribution range between the first and second electrodes, improve the uniformity of the electric field distribution between the first and second electrodes, and make the material heated more evenly in the furnace, thereby improving the consistency of the graphitized product.
[0018] In some embodiments, each second electrode post is constructed as a solid columnar structure. This allows for a more concentrated distribution of the electric field region between the first and second electrodes.
[0019] In some embodiments, the central axis of the first feeding channel coincides with the central axis of the second feeding channel. Thus, the first and second feeding channels are coaxially arranged, and the material in the material channel passes sequentially through the feeding channels of each electrode, improving the uniformity of material feeding. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of a graphitization furnace in some embodiments of this application.
[0021] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the first and second electrodes in the graphitization furnace.
[0022] Figure 3 for Figure 1 The image shows an isometric view of the first and second electrodes in the graphitization furnace.
[0023] Figure 4 for Figure 3 The top view of the first electrode is shown.
[0024] Figure 5 for Figure 3 The top view of the second electrode is shown.
[0025] Figure 6 This is a schematic diagram of a battery in some embodiments of this application.
[0026] Figure label:
[0027] 20. Battery; 21. Housing; 22. Individual battery cell;
[0028] 100. Furnace body; 101. Material channel; 200. First electrode; 201. First feeding channel; 210. First conductive ring; 211. First surface; 212. Second surface; 220. First electrode post; 300. Second electrode; 301. Second feeding channel; 310. Second conductive ring; 311. Third surface; 312. Fourth surface; 320. Second electrode post. Detailed Implementation
[0029] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0034] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0035] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0037] Currently, lithium-ion batteries are widely used in electric vehicles, consumer electronics, and other fields due to their high energy density and long lifespan. A graphitization furnace is a device that utilizes the resistive properties of materials, applying an electric field through electrodes to the materials within the furnace, causing them to generate heat and undergo a high-temperature reaction during the energization process, thus graphitizing the materials. For example, the materials can be used as negative electrode materials for batteries.
[0038] In some embodiments, when materials are heated in a graphitization furnace, uneven electric field or insufficient heating time may result in incomplete graphitization of the materials, reducing the consistency of the graphitized products.
[0039] Based on the above considerations, a graphitization furnace was designed. The material in the material channel flows sequentially through the first feeding channel and the second feeding channel before being discharged. That is, the material in the material channel passes sequentially through the feeding channels of each electrode. Since the side of the first electrode facing the second electrode is constructed as a convex arc surface structure along the direction close to the second electrode, and the side of the second electrode facing the first electrode is constructed as a concave arc surface structure along the direction away from the first electrode, it is beneficial to form a parallel electric field between the first conductive ring and the second conductive ring, which improves the uniformity of the electric field distribution between the first electrode and the second electrode, improves the consistency of material heating, and enables the material to be completely graphitized, which is beneficial to improving the consistency of graphitized products. In addition, the setting of the feeding channels of the electrodes can reduce the wear of the material on the lower outer surface of the electrode, which is beneficial to improving the service life of the electrode.
[0040] Please refer to Figure 1In one embodiment, the graphitization furnace includes a furnace body 100, a first electrode 200, and a second electrode 300. The furnace body 100 has a material channel 101, and the first electrode 200 is arranged around the material channel 101. The second electrode 300 has the opposite polarity to the first electrode 200. The second electrode 300 is arranged around the material channel 101 and is spaced apart from the first electrode 200 along a first direction, which is the axial direction of the material channel 101. The first electrode 200 has a first feeding channel 201, and the second electrode 300 has a second feeding channel 301. The side of the first electrode 200 facing the second electrode 300 is constructed as an arc-shaped structure that protrudes along the direction close to the second electrode 300, and the side of the second electrode 300 facing the first electrode 200 is constructed as an arc-shaped structure that is concave along the direction away from the first electrode 200.
[0041] It should be noted that the first direction is Figure 1 The X direction is shown.
[0042] In the embodiments of this application, the furnace body 100 is constructed to provide a processing environment for materials. This processing environment is typically isolated from the atmosphere and can be a vacuum environment, an atmospheric environment (such as a nitrogen atmosphere, an inert gas atmosphere, or a reducing atmosphere), depending on the processing requirements. The furnace body 100 includes a furnace shell, which is typically made of metal, possessing high strength and lightweight. A heat-insulating structure can also be installed inside the furnace shell, reducing heat loss from the interior of the furnace body 100 and keeping the surface temperature of the furnace shell low, thus saving energy and reducing the risk of burns. The furnace body 100 can have various shapes, such as, but not limited to, cylinders or prisms.
[0043] In the embodiments of this application, the material channel 101 can be cylindrical, prismatic, or other shaped channels, as long as it allows material to flow. The material channel 101 has an inlet and an outlet, which are arranged opposite to each other along a first direction. The material is input into the material channel 101 through the inlet and graphitized in the high-temperature environment inside the furnace body 100. It then flows sequentially through the first discharge channel 201 and the second discharge channel 301, and finally outputs the graphitized product through the outlet.
[0044] In the embodiments of this application, the first electrode 200 is configured as a component surrounding the material channel 101. The first electrode 200 has good conductivity; for example, the material of the first electrode 200 can be metal, graphite, etc. Since the first electrode 200 has a first feeding channel 201, the first electrode 200 has a hollow ring structure, such as a circular ring, a square ring, etc. The number of first electrodes 200 is not limited to one; the number and specific structure of the first electrodes 200 are not limited. Optionally, the current density of the first electrode 200 is 10 A / cm². 2 ~35A / cm 2The current load is 35000A~70000A, and the resistivity is less than 6μΩm.
[0045] In the embodiments of this application, the second electrode 300 is configured to surround the material channel 101 and is a component with the opposite polarity to the first electrode 200, that is, one of the second electrode 300 and the first electrode 200 is a positive electrode and the other is a negative electrode. The second electrode 300 has good conductivity; for example, the material of the second electrode 300 can be metal, graphite, etc. Since the second electrode 300 has a second feeding channel 301, the second electrode 300 has a hollow ring structure, such as a circular ring, a square ring, etc.; the number of second electrodes 300 is not limited to one, and the number and specific structure of the second electrodes 300 are not limited. Optionally, the current density of the second electrode 300 is 17 A / cm. 2 ~32A / cm 2 The current load is 30000A~70000A, and the resistivity is less than 6μΩm.
[0046] In the embodiments of this application, the side of the first electrode 200 facing the second electrode 300 is configured as a convex arcuate structure protruding in the direction close to the second electrode 300, that is, the side of the first electrode 200 facing the second electrode 300 is a downwardly convex arcuate structure. The side of the second electrode 300 facing the first electrode 200 is configured as a concave arcuate structure in the direction away from the first electrode 200, that is, the side of the second electrode 300 facing the first electrode 200 is a downwardly concave arcuate structure. Preferably, the curvature of the side of the first electrode 200 facing the second electrode 300 and the side of the second electrode 300 facing the first electrode 200 is the same, so as to facilitate the formation of a parallel electric field between the first electrode 200 and the second electrode 300.
[0047] In the aforementioned graphitization furnace, the material in the material channel 101 flows sequentially through the first feeding channel 201 and the second feeding channel 301 before being discharged. That is, the material in the material channel 101 passes sequentially through the feeding channels of each electrode. Since the side of the first electrode 200 facing the second electrode 300 is constructed as a convex arc surface structure along the direction close to the second electrode 300, and the side of the second electrode 300 facing the first electrode 200 is constructed as a concave arc surface structure along the direction away from the first electrode 200, it is beneficial to form a parallel electric field between the first conductive ring 210 and the second conductive ring 310, thereby improving the uniformity of the electric field distribution between the first electrode 200 and the second electrode 300, improving the consistency of material heating, and enabling the material to be completely graphitized, which is beneficial to improving the consistency of graphitized products. In addition, the setting of the electrode feeding channels can reduce the wear of the material on the lower outer surface of the electrode, which is beneficial to improving the service life of the electrode.
[0048] Based on some embodiments in this application, please refer to Figure 2The first electrode 200 includes a first conductive ring 210, and the side of the first electrode 200 facing the second electrode 300 is the fifth surface 213 of the first conductive ring 210; the second electrode 300 includes a second conductive ring 310, and the side of the second electrode 300 facing the first electrode 200 is the sixth surface 313 of the second conductive ring 310; the fifth surface 213 is constructed as a downwardly convex arc surface structure, and the sixth surface 313 is constructed as a downwardly concave arc surface structure, and the curvature of the fifth surface 213 and the sixth surface 313 is consistent.
[0049] In the embodiments of this application, the fifth surface 213 of the first conductive ring 210 and the sixth surface 313 of the second conductive ring 310 are both arc-shaped structures, and their curvatures are consistent, so that a parallel electric field is formed between the first conductive ring 210 and the second conductive ring 310.
[0050] The above configuration facilitates the formation of a parallel electric field between the first conductive ring 210 and the second conductive ring 310, improves the uniformity of the electric field distribution between the first electrode 200 and the second electrode 300, enhances the consistency of material heating, enables the material to be fully graphitized, and improves the consistency of graphitized products.
[0051] Based on some embodiments in this application, please refer to Figure 2 The first conductive ring 210 has a first surface 211 and a second surface 212 arranged opposite to each other along a first direction. The second surface 212 is connected to the fifth surface 213. The first feeding channel 201 extends from the first surface 211 to the second surface 212 along the first direction.
[0052] In the embodiments of this application, the first feeding channel 201 can be symmetrically or asymmetrically distributed along its own central axis, and the first feeding channel 201 can be a hollow circular groove, a square groove, or other shapes. Preferably, the first feeding channel 201 is disposed in the middle of the first conductive ring 210 along the first direction, which is beneficial for the first conductive ring 210 to form a uniform electric field.
[0053] With the above settings, the first feeding channel 201 can be smoothly set on the first electrode 200, so that the material can flow through the first feeding channel 201 in the first direction, thereby improving the uniformity of material feeding.
[0054] Based on some embodiments in this application, please refer to Figure 4 The ratio of the outer diameter to the inner diameter of the first conductive ring 210 is 1.4 to 9.
[0055] It should be noted that the outer diameter of the first conductive ring 210 is D1, and the inner diameter of the first conductive ring 210 is D2. The ratio of the outer diameter to the inner diameter of the first conductive ring 210 reflects the size of the first feeding channel 201 relative to the total area of the first conductive ring 210. The larger the ratio, the smaller the area occupied by the first feeding channel 201; conversely, the smaller the ratio, the larger the area occupied by the first feeding channel 201.
[0056] By limiting the ratio of the inner and outer diameters of the first conductive ring 210, the space occupied by the first feeding channel 201 and the overall space occupied by the first conductive ring 210 can be limited. This reduces the probability of flow deviation and allows for a reasonable design of the volume of the first conductive ring 210, which is beneficial for improving the uniformity of material feeding and the consistency of heating.
[0057] Based on some embodiments in this application, please refer to Figure 4 The ratio of the outer diameter to the inner diameter of the first conductive ring 210 is 1.4 to 2.5.
[0058] With the above settings, the ratio of the outer diameter to the inner diameter of the first conductive ring 210 is in the optimal range, which further reduces the probability of flow deviation and optimizes the volume of the first conductive ring 210, which helps to improve the uniformity of material feeding and heating consistency, so that the material can be completely graphitized.
[0059] Based on some embodiments in this application, please refer to Figure 2 and Figure 3 The first electrode 200 further includes at least one pair of first electrode posts 220. Two of the first electrode posts 220 in each pair are distributed on both sides of the material channel 101 along the second direction. Each first electrode post 220 surrounds the outer periphery of the first conductive ring 210 and extends along the second direction, which is the radial direction of the material channel 101.
[0060] It should be noted that the second direction is Figure 2 and Figure 3 The Y direction is shown. The two first electrode posts 220 in each pair of first electrode posts 220 are distributed on both sides of the material channel 101 along the second direction. It can be understood that the first electrode posts 220 are inserted into the furnace body 100 along the second direction, and the two first electrode posts 220 in each pair of first electrode posts 220 are arranged opposite each other.
[0061] In the embodiments of this application, the two first electrode posts 220 in each pair of first electrode posts 220 have the same height, that is, the positions of each first electrode post 220 in the first direction are the same, so that the material can be heated and graphitized in a region at the same height, reducing the probability of inconsistency in graphitized products due to uneven heating of the material. The two first electrode posts 220 in each pair of first electrode posts 220 have the same size in the second direction, and the length of each first electrode post 220 inserted into the furnace body 100 in the second direction is the same, so as to facilitate the formation of a uniform electric field.
[0062] In the embodiments of this application, each first electrode post 220 is arranged around the outer periphery of the first conductive ring 210, that is, the first conductive ring 210 connects each first electrode post 220. The first conductive ring 210 and each first electrode post 220 can be fixed in various ways. For example, the first conductive ring 210 and each first electrode post 220 can be an integral structure or a separate structure. No specific limitation is made here.
[0063] In the embodiments of this application, the first conductive ring 210 is a hollow ring structure. The first conductive ring 210 can be a closed circular ring, a semi-closed semi-circular ring, or other forms of ring structure. The number of first conductive rings 210 is not limited to one. When the number of first conductive rings 210 is at least two, each first conductive ring 210 is arranged side by side along the first direction, and each first conductive ring 210 connects the first electrode posts 220 at the same height, so that high-temperature zones can be formed at different positions in the axial direction of the material channel 101.
[0064] With the above configuration, the first electrode 200 includes a pair of first electrode posts 220, which can increase the electric field distribution range between the first electrode 200 and the second electrode 300, improve the uniformity of the electric field distribution between the first electrode 200 and the second electrode 300, and make the material heated more evenly in the furnace body 100, thereby improving the consistency of graphitized products.
[0065] Based on some embodiments in this application, please refer to Figure 1 Each of the first electrode posts 220 is constructed as a solid columnar structure.
[0066] In the embodiments of this application, the columnar structure includes cylindrical, prismatic, or other shaped columnar structures. The shapes of each first electrode post 220 may be the same or different.
[0067] The above settings enable a more concentrated electric field distribution between the first electrode 200 and the second electrode 300, improving the uniformity of the electric field distribution between the first electrode 200 and the second electrode 300. This results in more uniform heating of the material within the furnace body 100, thereby improving the consistency of the graphitized product.
[0068] Based on some embodiments in this application, please refer to Figure 2 The second conductive ring 310 has a third surface 311 and a fourth surface 312 arranged opposite to each other along the first direction. The fourth surface 312 is connected to the sixth surface 313. The second feeding channel 301 extends from the third surface 311 to the fourth surface 312 along the first direction.
[0069] In the embodiments of this application, the second feeding channel 301 can be symmetrically or asymmetrically distributed along its own central axis, and the second feeding channel 301 can be a hollow circular groove, a square groove, or other shapes. Preferably, the second feeding channel 301 is disposed in the middle of the second conductive ring 310 along the first direction, which is beneficial for the second conductive ring 310 to form a uniform electric field.
[0070] With the above settings, the first feeding channel 201 can be smoothly set on the second electrode 300, so that the material can flow through the second feeding channel 301 in the first direction, thereby improving the uniformity of material feeding.
[0071] Based on some embodiments in this application, please refer to Figure 5 The ratio of the outer diameter to the inner diameter of the second conductive ring 310 is 1.15 to 5.5.
[0072] It should be noted that the outer diameter of the second conductive ring 310 is D3, and the inner diameter of the second conductive ring 310 is D4. The ratio of the outer diameter to the inner diameter of the second conductive ring 310 reflects the size of the second feeding channel 301 relative to the total area of the second conductive ring 310. The larger the ratio, the smaller the area occupied by the second feeding channel 301; conversely, the smaller the ratio, the larger the area occupied by the second feeding channel 301.
[0073] By limiting the ratio of the inner and outer diameters of the second conductive ring 310, the space occupied by the second feeding channel 301 and the overall space occupied by the second conductive ring 310 can be limited. This reduces the probability of flow deviation and allows for a reasonable design of the volume of the second conductive ring 310, which helps to improve the uniformity of material feeding and the consistency of heating.
[0074] Based on some embodiments in this application, please refer to Figure 5 The ratio of the outer diameter to the inner diameter of the second conductive ring 310 is 1.15 to 2.5.
[0075] With the above settings, the ratio of the outer diameter to the inner diameter of the second conductive ring 310 is in the optimal range, which further reduces the probability of flow deviation and optimizes the volume of the second conductive ring 310, which is conducive to improving the uniformity of material feeding and heating consistency, so that the material can be completely graphitized.
[0076] Based on some embodiments in this application, please refer to Figure 5 The ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210 is 1.0 to 7.5.
[0077] In the embodiments of this application, the ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210 reflects the volume ratio of the second feeding channel 301 to the first feeding channel 201. The larger the ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210, the greater the volume difference between the second feeding channel 301 and the first feeding channel 201; the smaller the ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210, the smaller the volume difference between the second feeding channel 301 and the first feeding channel 201.
[0078] By setting the inner diameter ratio of the second conductive ring 310 to the first conductive ring 210, the material can be smoothly fed from the first feeding channel 201 and the second feeding channel 301, which helps to improve the uniformity of material feeding and the consistency of heating.
[0079] Based on some embodiments in this application, please refer to Figure 5 The ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210 is 1.0 to 2.3.
[0080] With the above settings, the ratio of the inner diameter of the second conductive ring 310 to that of the first conductive ring 210 is in the optimal range, which can further improve the uniformity of material feeding and heating consistency, so that the material can be completely graphitized.
[0081] Based on some embodiments in this application, please refer to Figure 2 In the first direction, the distance between the second conductive ring 310 and the first conductive ring 210 is 1.1mm to 5.5mm.
[0082] It should be noted that the distance between the second conductive ring 310 and the first conductive ring 210 in the first direction is L2.
[0083] By setting the distance between the second conductive ring 310 and the first conductive ring 210 in the first direction, the electric field distribution range between the second conductive ring 310 and the first conductive ring 210 can be optimized.
[0084] Based on some embodiments in this application, please refer to Figure 2The second electrode 300 further includes at least one pair of second electrode posts 320. Two of the second electrode posts 320 in each pair are distributed on both sides of the material channel 101 along the second direction. Each second electrode post 320 surrounds the outer periphery of the second conductive ring 310 and extends along the second direction, which is the radial direction of the material channel 101.
[0085] It should be noted that the two second electrode posts 320 in each pair are distributed on both sides of the material channel 101 along the second direction, which can be understood as: the second electrode posts 320 along the second direction. Figure 2 The electrode is inserted into the furnace body 100 in the Y direction, and the two second electrode posts 320 in each pair are arranged opposite each other.
[0086] In the embodiments of this application, the two second electrode posts 320 in each pair of second electrode posts 320 have the same height, that is, the positions of each second electrode post 320 in the first direction are the same, so that the material can be heated and graphitized in a region at the same height, reducing the probability of inconsistency in graphitized products due to uneven heating of the material. The two second electrode posts 320 in each pair of second electrode posts 320 have the same size in the second direction, and the length of each second electrode post 320 inserted into the furnace body 100 in the second direction is the same, so as to facilitate the formation of a uniform electric field.
[0087] In the embodiments of this application, each second electrode post 320 is disposed around the outer periphery of the second conductive ring 310, that is, the second conductive ring 310 connects each second electrode post 320. The second conductive ring 310 and each second electrode post 320 can be fixed in various ways. For example, the second conductive ring 310 and each second electrode post 320 can be an integral structure or a separate structure, and no specific limitation is made here.
[0088] In the embodiments of this application, the second conductive ring 310 is a hollow ring structure. The second conductive ring 310 can be a closed circular ring, a semi-closed semi-circular ring, or other forms of ring structure. The number of second conductive rings 310 is not limited to one. When the number of second conductive rings 310 is at least two, each second conductive ring 310 is arranged side by side along the first direction, and each second conductive ring 310 connects the second electrode posts 320 at the same height, so that high-temperature zones can be formed at different positions in the axial direction of the material channel 101.
[0089] With the above configuration, the second electrode 300 includes a pair of second electrode posts 320, which can increase the electric field distribution range between the first electrode 200 and the second electrode 300, improve the uniformity of the electric field distribution between the first electrode 200 and the second electrode 300, and make the material heated more evenly in the furnace body 100, thereby improving the consistency of graphitized products.
[0090] Based on some embodiments in this application, please refer to Figure 2 Each of the second electrode posts 320 is constructed as a solid columnar structure.
[0091] In the embodiments of this application, the columnar structure includes cylindrical, prismatic, or other shaped columnar structures. The shapes of each second electrode post 320 may be the same or different.
[0092] The above settings enable a more concentrated distribution of the electric field region between the first electrode 200 and the second electrode 300.
[0093] Based on some embodiments in this application, please refer to Figure 2 The central axis of the first feeding channel 201 is set to coincide with the central axis of the second feeding channel 301.
[0094] It should be noted that the central axis of the first feeding channel 201 and the central axis of the second feeding channel 301 are both... Figure 1 As shown in L1.
[0095] In the embodiments of this application, the first feeding channel 201 is disposed through the first electrode 200 along the first direction. The first feeding channel 201 can be symmetrically distributed or asymmetrically distributed along its own central axis. The first feeding channel 201 can be a hollow circular groove, a square groove, or other shapes.
[0096] In the embodiments of this application, the second feeding channel 301 is disposed through the second electrode 300 along the first direction. The second feeding channel 301 can be symmetrically distributed or asymmetrically distributed along its own central axis. The second feeding channel 301 can be a hollow circular groove, a square groove, or other shapes.
[0097] With the above configuration, the first feeding channel 201 and the second feeding channel 301 are coaxially arranged, and the material in the material channel 101 passes through the feeding channels of each electrode in sequence, which can improve the uniformity of material feeding.
[0098] Please refer to Figure 6 In one embodiment, the battery production system includes the graphitization furnace described above, which is used to prepare the negative electrode material of the battery 20.
[0099] It should be noted that the graphitization furnace is used to prepare the negative electrode material of battery 20, and the negative electrode material can be graphite. The graphitization furnace transforms the random layer structure of carbon atoms into an ordered graphite crystal structure by heating, thereby achieving graphitization.
[0100] In the embodiments of this application, reference is made to Figure 6The battery 20 includes a housing 21 and individual battery cells 22, with the individual battery cells 22 housed within the housing 21. The battery 20 can contain multiple individual battery cells 22, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple individual battery cells 22 are connected in both series and parallel configurations. Multiple individual battery cells 22 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these individual battery cells 22 is housed within the housing 21. Alternatively, the battery 20 can also consist of multiple individual battery cells 22 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is also housed within the housing 21. The battery 20 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple individual battery cells 22.
[0101] Each battery cell 22 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 22 can be cylindrical, flat, cuboid, or other shapes.
[0102] To study the influence of different values of graphitization furnace parameters on the degree of graphitization of products, several comparative experiments were set up to test and compare the relevant parameters of the graphitization furnace.
[0103] It should be noted that the degree of graphitization refers to the extent to which carbon atoms in a carbon material arrange themselves to form a structure similar to graphite crystals. In an ideal graphite crystal, carbon atoms are arranged in regular hexagonal layers. However, in actual carbon materials, the arrangement of carbon atoms may contain various defects and disorder. Therefore, the degree of graphitization is an indicator of how closely the structure of a carbon material resembles the ideal graphite structure.
[0104] Therefore, the higher the degree of graphitization of a product, the more stable its structure and the better its performance. In practical applications, different products have different requirements for the degree of graphitization. Taking one embodiment of this application as an example, the acceptable standard for the degree of graphitization of the product is 91.2%. That is to say, when the degree of graphitization of the product is greater than or equal to 91.2%, the product is qualified and meets the production requirements. If the degree of graphitization of the product is less than 91.2%, the product is considered unqualified.
[0105] Furthermore, in actual production, the degree of graphitization of products is usually detected using X-ray diffraction. When X-rays irradiate a crystal, diffraction occurs, and crystal planes with different interplanar spacings will produce diffraction peaks at specific angles. Therefore, by measuring the position, intensity, and full width at half maximum (FWHM) of the diffraction peaks in the XRD pattern of carbon materials, the degree of graphitization can be calculated using relevant formulas. In this comparative experiment, Examples 1-3 and Comparative Example 1 were set up. All other structures and experimental conditions in each example and comparative example were the same, except for the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210. The results were evaluated by testing the degree of graphitization of the products in each example and comparative example, as detailed below:
[0106] Example 1:
[0107] Both the first electrode 200 and the second electrode 300 are made of graphite, and there is only one of each. The ratio of the outer diameter D1 to the inner diameter D2 of the first conductive ring 210 is 1.4, the ratio of the outer diameter D3 to the inner diameter D4 of the second conductive ring 310 is 1.15, the distance L2 between the second conductive ring 310 and the first conductive ring 210 in the first direction is 1.1 mm, and the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 is 1.4. The graphitization degree of the product was tested to be 92.8%.
[0108] Example 2:
[0109] Both the first electrode 200 and the second electrode 300 are made of graphite, and there is only one of each. The ratio of the outer diameter D1 to the inner diameter D2 of the first conductive ring 210 is 1.4, the ratio of the outer diameter D3 to the inner diameter D4 of the second conductive ring 310 is 1.15, the distance L2 between the second conductive ring 310 and the first conductive ring 210 in the first direction is 1.1 mm, and the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 is 2.0. The graphitization degree of the product was tested to be 93.1%.
[0110] Example 3:
[0111] Both the first electrode 200 and the second electrode 300 are made of graphite, and there is only one of each. The ratio of the outer diameter D1 to the inner diameter D2 of the first conductive ring 210 is 1.4, the ratio of the outer diameter D3 to the inner diameter D4 of the second conductive ring 310 is 1.15, the distance L2 between the second conductive ring 310 and the first conductive ring 210 in the first direction is 1.1 mm, and the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 is 2.5. The graphitization degree of the product was tested to be 92.7%.
[0112] Comparative Example 1:
[0113] Both the first electrode 200 and the second electrode 300 are made of graphite, and there is only one of each. The ratio of the outer diameter D1 to the inner diameter D2 of the first conductive ring 210 is 1.4, the ratio of the outer diameter D3 to the inner diameter D4 of the second conductive ring 310 is 1.15, the distance L2 between the second conductive ring 310 and the first conductive ring 210 in the first direction is 1.1 mm, and the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 is 6.0. The graphitization degree of the product was tested to be 84.6%.
[0114] As can be seen from the above, when the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 is within the aforementioned range, the graphitization degree of the product is high and meets the standard. However, when the ratio of the inner diameter D4 of the second conductive ring 310 to the inner diameter D2 of the first conductive ring 210 exceeds the range, the graphitization degree of the product does not meet the standard.
[0115] According to some embodiments of this application, see Figures 1 to 5 In one embodiment, the graphitization furnace includes a furnace body 100, a first electrode 200, and a second electrode 300. The furnace body 100 has a material channel 101, and the first electrode 200 is arranged around the material channel 101. The second electrode 300 has the opposite polarity to the first electrode 200, and is also arranged around the material channel 101, spaced apart from the first electrode 200 along a first direction. The first electrode 200 has a first feeding channel 201, and the second electrode 300 has a second feeding channel 301.
[0116] The first electrode 200 includes a first conductive ring 210 and at least one pair of first electrode posts 220. Two of the first electrode posts 220 in each pair are distributed on both sides of the material channel 101 along the second direction. Each first electrode post 220 surrounds the outer periphery of the first conductive ring 210 and extends along the second direction. The first feeding channel 201 extends through the middle of the first conductive ring 210 along the first direction. Each first electrode post 220 is constructed as a solid columnar structure. The ratio of the outer diameter to the inner diameter of the first conductive ring 210 is 1.4 to 2.5.
[0117] The second electrode 300 includes a second conductive ring 310 and at least one pair of second electrode posts 320. Two of the second electrode posts 320 in each pair are distributed on both sides of the material channel 101 along the second direction. Each second electrode post 320 surrounds the outer periphery of the second conductive ring 310 and extends along the second direction. The second feeding channel 301 extends through the middle of the second conductive ring 310 along the first direction. Each second electrode post 320 is constructed as a solid columnar structure. The ratio of the outer diameter to the inner diameter of the second conductive ring 310 is 1.15 to 2.5, and the ratio of the inner diameter of the second conductive ring 310 to the inner diameter of the first conductive ring 210 is 1.0 to 2.3. The side of the first conductive ring 210 facing the second conductive ring 310 is constructed as an arc-shaped structure that bulges out in the direction close to the second electrode 300, and the side of the second conductive ring 310 facing the first conductive ring 210 is constructed as an arc-shaped structure that is concave in the direction away from the first conductive ring 210. The curvature of the side of the first conductive ring 210 facing the second conductive ring 310 and the side of the second conductive ring 310 facing the first conductive ring 210 is the same.
[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A graphitization furnace characterized by, The utility model relates to a kind of electrode structure of resistance furnace, including: Furnace body (100), material passage (101) are arranged in it; First electrode (200), it is arranged around the material passage (101); Second electrode (300), the polarity opposite with the first electrode (200);Second electrode (300) is arranged around the material passage (101), and it is spaced apart with the first electrode (200) along first direction, the first direction is the axial direction of the material passage (101); Wherein, the first electrode (200) has first blanking passage (201), and the second electrode (300) has second blanking passage (301);The side of the first electrode (200) towards the second electrode (300) is configured as the arc surface structure of the direction of being close to the second electrode (300) convex, and the side of the second electrode (300) towards the first electrode (200) is configured as the arc surface structure of the direction of being away from the first electrode (200) concave.
2. The graphitization furnace of claim 1, wherein, The first electrode (200) includes first conducting ring (210), and the side of the first electrode (200) towards the second electrode (300) is the fifth surface (213) of the first conducting ring (210); The second electrode (300) includes second conducting ring (310), and the side of the second electrode (300) towards the first electrode (200) is the sixth surface (313) of the second conducting ring (310); The fifth surface (213) is configured as the arc surface structure of the direction of being convex downward, and the sixth surface (313) is configured as the arc surface structure of the direction of being concave downward, and the bending arc of the fifth surface (213) and the sixth surface (313) is consistent.
3. The graphitization furnace of claim 2, wherein, The first conducting ring (210) has first surface (211) and second surface (212) arranged in the opposite direction along the first direction, the second surface (212) is connected with the fifth surface (213), and the first blanking passage (201) penetrates from the first surface (211) to the second surface (212) along the first direction.
4. The graphitization furnace of claim 2, wherein The ratio of the outer diameter of the first conducting ring (210) to the inner diameter of the first conducting ring (210) is 1.4-9.
5. The graphitization furnace of claim 4, wherein, The ratio of the outer diameter of the first conducting ring (210) to the inner diameter of the first conducting ring (210) is 1.4-2.
5.
6. The graphitization furnace of claim 2, wherein The first electrode (200) further includes at least one pair of first electrode columns (220), two first electrode columns (220) in each pair of first electrode columns (220) are distributed on both sides of the material passage (101) along the second direction, each first electrode column (220) is arranged around the outer periphery of the first conducting ring (210) and extends along the second direction, and the second direction is the radial direction of the material passage (101).
7. The graphitization furnace of claim 6, wherein Each first electrode column (220) is configured as a solid columnar structure.
8. The graphitization furnace of claim 2, wherein, The second conductive ring (310) has a third surface (311) and a fourth surface (312) arranged opposite to each other along the first direction, and the fourth surface (312) is connected with the sixth surface (313), and the second feeding channel (301) penetrates through the third surface (311) to the fourth surface (312) along the first direction.
9. The graphitization furnace of claim 2, wherein, The ratio of the outer diameter of the second conductive ring (310) to the inner diameter of the second conductive ring (310) is 1.15-5.
5.
10. The graphitization furnace of claim 9, wherein, The ratio of the outer diameter of the second conductive ring (310) to the inner diameter of the second conductive ring (310) is 1.15-2.
5.
11. The graphitization furnace of claim 2, wherein, The ratio of the inner diameter of the second conductive ring (310) to the inner diameter of the first conductive ring (210) is 1.0-7.
5.
12. The graphitization furnace of claim 11, wherein, The ratio of the inner diameter of the second conductive ring (310) to the inner diameter of the first conductive ring (210) is 1.0-2.
3.
13. The graphitization furnace of claim 2, wherein, In the first direction, the distance between the second conductive ring (310) and the first conductive ring (210) is 1.1mm-5.5mm.
14. The graphitization furnace of claim 2, wherein, The second electrode (300) further comprises at least one pair of second electrode columns (320), two second electrode columns (320) in each pair of second electrode columns (320) are distributed on both sides of the material channel (101) along a second direction, each second electrode column (320) surrounds the outer periphery of the second conductive ring (310) and extends along the second direction, and the second direction is the radial direction of the material channel (101).
15. The graphitization furnace of claim 14, wherein, Each second electrode column (320) is configured as a solid columnar structure.
16. The graphitization furnace of claim 1, wherein, The central axis of the first feeding channel (201) and the central axis of the second feeding channel (301) are arranged coincidentally.