Graphitization furnace and battery production system

Abstract

The utility model provides a graphitization furnace and a battery production system. The graphitization furnace and the battery production system can improve the consistency of graphitization products. The graphitization furnace comprises: a furnace body (100), wherein a material channel (101) is arranged in the furnace body; each pair of electrodes (200) in the at least one pair of electrodes (200) are oppositely arranged in the radial direction of the material channel (101), a gap is formed between each pair of electrodes (200), and the gaps are used for forming part of channel sections of the material channel (101); wherein the polarities of the two electrodes (200) in each pair of electrodes (200) are opposite, and the first surfaces (210), facing the material channel (101), of the electrodes (200) are cambered surfaces.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial equipment, and more particularly, to a graphitization furnace and a battery production system. BACKGROUND

[0002] With the rapid development of energy technology, batteries have become an indispensable part of human life. At present, among the negative electrode materials of batteries, carbon materials are widely used, among which, graphitized carbon materials (also known as graphite materials) have been widely commercialized due to their long service life, stable structure, low cost and other advantages.

[0003] A graphitization furnace is a device that can generate graphite materials. By high-temperature heat treatment of carbon materials, carbon atoms can be recrystallized and reordered to exhibit the crystal structure of graphite. However, the traditional graphitization furnace has the problem of being unable to concentrate heating and poor consistency of products. SUMMARY

[0004] The embodiments of the present application provide a graphitization furnace and a battery production system, which can improve the consistency of graphitized products.

[0005] In a first aspect, a graphitization furnace is provided, comprising: a furnace body, a material channel being arranged in the furnace body; at least one pair of electrodes, each pair of electrodes in the at least one pair of electrodes being oppositely arranged along a radial direction of the material channel and having a gap, the gap being used to form a partial channel section of the material channel; wherein the polarities of the two electrodes in each pair of electrodes are opposite, and a first surface of the electrode facing the material channel is an arc surface.

[0006] The technical scheme of the embodiments of the present application oppositely arranges each pair of electrodes in the at least one pair of electrodes in the graphitization furnace along the radial direction of the material channel, which can form a uniform electric field in the partial channel section in the material channel, i.e., the core heating zone is located in the partial material channel, so that the graphitization degree of the material can be kept consistent when the material passes through the partial material channel, thereby improving the consistency of the graphitized products. In addition, when the first surface of the electrode facing the material channel is arranged as an arc surface, the circumferential size of the arc surface can be adjusted to increase the cross-sectional area of the material entering the electric field, so that as much material as possible passes through the core heating zone, thereby further improving the consistency of the graphitized products.

[0007] In some possible implementations, along the extension direction of the material channel, the size of the first surface is L1, and the size of the wall of the furnace body is L2, L1 and L2 satisfy the following relationship: 3 < L2 / L1 < 9.

[0008] The above embodiments, after extensive experimental verification, show that by setting the ratio L2 / L1 of the furnace wall dimension L2 to the first surface dimension L1 within the range of 3 to 9 along the extension direction of the material channel, the graphitization furnace can meet the quality requirements of graphitized products while reducing the manufacturing cost of the graphitization furnace.

[0009] In some possible implementations, the electrode includes an arcuate electrode portion; the arcuate electrode portion protrudes from the inner wall of the material channel along the radial direction of the material channel; wherein, the first surface is the surface of the arcuate electrode portion facing the material channel.

[0010] In the above embodiments, by protruding the arc-shaped electrode portion onto the inner wall of the material channel, the material entering the material channel can enter the core heating zone formed by the electric field in an inverted platform or umbrella shape. This can gather the material so that more material passes through the core heating zone for heating, thereby improving the consistency of the graphitized product.

[0011] In some possible implementations, the thickness of the arcuate electrode portion along the radial direction of the material channel is T, and the inner diameter of the channel section before the material enters the gap in the material channel is R, where T and R satisfy: 4 <R / T<10。

[0012] The above embodiments, after extensive experimental verification, show that setting the ratio of the inner diameter R of the channel section before the material enters the gap in the material channel to the thickness T of the arc-shaped electrode part within 4 to 10 can take into account the flowability of the material in the material channel and improve the consistency of the graphitized product.

[0013] In some possible implementations, an insulating element is provided between two adjacent arcuate electrode portions along the circumferential direction of the material channel.

[0014] In the above embodiments, by providing an insulating element between two adjacent arc-shaped electrode portions, the probability of generating an electric field between the two adjacent arc-shaped electrode portions can be reduced, thereby improving the uniformity of the electric field between the opposing arc-shaped electrode portions and thus improving the consistency of the graphitized product.

[0015] In some possible implementations, the insulating element is embedded between two adjacent arcuate electrode portions.

[0016] In the above embodiments, by providing an insulating element between two adjacent arc-shaped electrode sections, the probability of material flowing between the two arc-shaped electrode sections without flowing through the core heating zone can be reduced, thereby improving the consistency of graphitized products.

[0017] In some possible implementations, the insulating element is arc-shaped.

[0018] In the above embodiment, since the arc-shaped electrode portion is arc-shaped, setting the insulating member to an arc-shaped form can improve the fit between the insulating member and two adjacent arc-shaped electrode portions, and enhance the connection between the insulating member and the arc-shaped electrode portion.

[0019] In some possible implementations, the insulating element forms a ring with all the arcuate electrode portions. This allows the material entering the electric field to more closely approximate a complete inverted frustum or umbrella shape, further concentrating the material and allowing more material to pass through the core heating zone, thereby improving the consistency of the graphitized product.

[0020] In some possible implementations, the sum of the circumferential dimensions of all the said arc-shaped electrode portions is Ct, and the circumferential dimension of the annulus is C, where Ct and C satisfy: 0.5 <Ct / C<1。

[0021] In the above embodiments, the ratio of the sum of the circumferential dimensions Ct of all the arc electrode portions 220 to the circumferential dimension C of the ring is set between 0.5 and 1, which can improve the consistency of graphitized products while meeting the quality requirements of graphitized products.

[0022] In some possible implementations, the insulating element further includes an insulating protrusion that protrudes into the wall of the furnace body in the radial direction of the material channel.

[0023] In the above embodiment, the insulating protrusion is set inside the furnace body. The furnace body has a certain clamping effect on the insulating component with the insulating protrusion, which can reduce the probability of the insulating component falling between two adjacent arc-shaped electrode parts.

[0024] In some possible implementations, a discharge channel section is provided at one end of the material channel along the extending direction of the material channel; the inner wall of the discharge channel section is flush with the first surface along the extending direction of the material channel.

[0025] In the above embodiments, by setting the inner wall of the discharge channel section to be flush with the first surface along the extension direction of the material channel, the probability of material accumulating in the electric field can be reduced, thereby reducing the phenomenon of the accumulated material being continuously heated, and thus improving the consistency of graphitized products.

[0026] In some possible implementations, the electrode further includes a current-guiding electrode portion, one end of which is connected to the arcuate electrode portion and the other end of which is connected to a power source.

[0027] In the above embodiments, by setting a fluid-conducting electrode part in the electrode, one end of which is connected to the power supply and the other end of which is connected to the arc-shaped electrode part, the volume of the fluid-conducting electrode part can be flexibly set while meeting the requirements of conductivity and load-bearing capacity, so as to reduce the manufacturing cost of the electrode and further reduce the manufacturing cost of the graphitization furnace.

[0028] In some possible implementations, the graphitization furnace also includes a current controller for sequentially connecting each pair of electrodes to a power source.

[0029] In the above embodiments, by setting a current controller in the graphitization furnace and connecting each pair of electrodes to the power supply in sequence through the current controller, the uniformity of the electric field can be improved, making the temperature of the core heating zone uniform throughout, thereby improving the consistency of the graphitized products.

[0030] In some possible implementations, the furnace body further includes a cylindrical insulation element for forming the material channel.

[0031] In the above embodiments, by designing the insulation component as a cylindrical insulation component, this cylindrical insulation component can be reused to form the material channel inside the furnace body, thereby reducing the need for additional materials to form the material channel. This technical solution reduces the manufacturing cost of the graphitization furnace while maintaining its performance.

[0032] In some possible implementations, the thermal conductivity of the cylindrical insulation element is in the range of 0.2 to 0.5 W / mk.

[0033] The above embodiments, after extensive experimental verification, show that setting the thermal conductivity of the cylindrical insulation component within the range of 0.2 to 0.5 W / mk can improve the insulation effect of the cylindrical insulation component, reduce the energy consumption of the graphitization furnace, and thus extend the service life of the graphitization furnace.

[0034] In some possible implementations, the furnace body further includes a heat-resistant component disposed on the side of the cylindrical insulation component facing the outside of the furnace body.

[0035] By providing a heat-resistant component on the side of the cylindrical insulation component facing the outside of the furnace body through the technical solution of this application embodiment, the internal space of the furnace body can be further insulated, reducing heat loss inside the furnace body and reducing the energy consumption of the graphitization furnace, thereby further improving the service life of the graphitization furnace.

[0036] In some possible implementations, the heat-resistant component is cylindrical and fits around the outer periphery of the cylindrical insulation component.

[0037] In the above embodiments, the cylindrical heat-resistant component has a larger dimension in the axial direction, which can completely cover the outer periphery of the cylindrical heat-insulating component in the axial direction, thereby achieving a better heat-insulating effect on the cylindrical heat-insulating component.

[0038] In some possible implementations, the thermal conductivity of the heat-resistant component is greater than that of the cylindrical insulation component.

[0039] In the above embodiments, setting the thermal conductivity of the heat-resistant component to be lower than that of the cylindrical insulation component can improve the insulation effect while reducing the manufacturing cost of the graphitization furnace.

[0040] In some possible implementations, the thermal conductivity of the heat-resistant element is in the range of 0.5 to 1.2 W / mk.

[0041] In a second aspect, a battery production system is provided, comprising: a graphitization furnace as described in the first aspect or any possible embodiment of the first aspect, the graphitization furnace being used to produce negative electrode graphite material for batteries.

[0042] The technical solution of this application embodiment arranges each pair of electrodes in the graphitization furnace opposite to each other along the radial direction of the material channel. This can form a uniform electric field in a portion of the material channel, where the core heating zone is located. As the material passes through this portion of the material channel, the degree of graphitization of the material can be kept consistent, thereby improving the consistency of the graphitized product. Furthermore, by setting the first surface of the electrode facing the material channel as an arc surface curved circumferentially along the material channel, the circumferential dimension of the arc surface can be adjusted to increase the cross-sectional area of ​​the material entering the electric field, allowing as much material as possible to pass through the core heating zone, thereby further improving the consistency of the graphitized product. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0044] Figure 1 This is a schematic structural diagram of a graphitization furnace disclosed in an embodiment of this application;

[0045] Figure 2 This is a top cross-sectional view of a graphitization furnace disclosed in an embodiment of this application;

[0046] Figure 3 This is a schematic structural diagram of a graphitization furnace disclosed in an embodiment of this application;

[0047] Figure 4 This is a schematic structural diagram of another graphitization furnace disclosed in the embodiments of this application;

[0048] Figure 5 This is a top cross-sectional view of another graphitization furnace disclosed in the embodiments of this application;

[0049] Figure 6This is a top cross-sectional view of another graphitization furnace disclosed in the embodiments of this application;

[0050] Figure 7 This is a top cross-sectional view of an arc-shaped electrode portion and an insulating component disclosed in an embodiment of this application;

[0051] Figure 8 This is a top cross-sectional view of another graphitization furnace disclosed in the embodiments of this application;

[0052] Figure 9 This is a schematic structural diagram of another graphitization furnace disclosed in the embodiments of this application;

[0053] The accompanying drawings are not drawn to scale. Detailed Implementation

[0054] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0056] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] This application relates to a graphitization furnace, which can transform the irregular arrangement of carbon atoms in a carbon material into an ordered graphite crystal structure through heating, thereby achieving graphitization of the carbon material. The graphitization process aims to improve the thermal and electrical conductivity of carbon materials, enhance their thermal shock resistance and chemical stability, impart lubricity and wear resistance, increase their purity, reduce their hardness, and make them easier to machine, among other things.

[0058] Currently, graphitization furnaces are mainly used for the sintering and graphitization of carbon materials, graphitization of polyimide films (PI), graphitization of thermally conductive materials, sintering of carbon fiber ropes, graphitization of carbon fiber filaments, graphite purification, and high-temperature processing of other materials that can be graphitized in a carbon environment. In some specific applications, graphite materials processed in graphitization furnaces can be used to form negative electrode materials for batteries; for example, graphite is currently a major negative electrode material for lithium batteries.

[0059] In this application, a battery refers to a physical module comprising one or more battery cells to provide electrical energy. A battery generally includes a casing for encapsulating one or more battery cells. Optionally, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application does not limit this. Graphite can be used as the negative electrode active material of the battery cell, and in conjunction with the positive electrode active material of the battery cell (e.g., lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.) to facilitate the movement of metal ions to form an electric current.

[0060] In some graphitization furnace designs, a positive electrode and a negative electrode are installed inside the furnace. One end of each electrode is connected to a DC or AC power source, while the other ends are positioned opposite each other, creating an electric field between them. When carbon material entering the furnace passes through this electric field, the field energizes the carbon material, causing it to heat up through its own resistance and reach the graphitization temperature, thus achieving the graphitization process.

[0061] For example, a traditional vertical graphitization furnace includes a columnar electrode at the top of the furnace body and an annular electrode at the bottom. The columnar electrode is placed vertically at the center of the material channel, while the annular electrode is placed horizontally. An umbrella-shaped or frustum-shaped electric field is formed between the lower surface of the columnar electrode and the inner surface of the annular electrode. When the material passes through this electric field, it generates Joule heat due to its own resistance, thus forming an umbrella-shaped or frustum-shaped high-temperature region. Graphitization of the material occurs after passing through this high-temperature region. However, the electric field is not uniformly distributed, resulting in unequal Joule heat generated by the material passing through different regions of the electric field. In other words, the aforementioned high-temperature region includes a core heating zone with a higher temperature below the columnar electrode and a non-core heating zone with a lower temperature. When the material flows in the material channel, some material is heated through the core heating zone, while other material is heated through the non-core heating zone. This leads to poor consistency in the graphitized product.

[0062] In view of this, this application provides a novel graphitization furnace, comprising: a furnace body and at least one pair of electrodes. A material channel is provided within the furnace body. Each pair of electrodes is arranged opposite to each other along the radial direction of the material channel and has a gap, which forms a partial channel segment of the material channel. The first surface of the electrodes facing the material channel is an arc surface. In the technical solution provided in this application, the positive and negative electrodes in each pair are arranged opposite to each other along the radial direction of the material channel, which can form a parallel and uniform electric field in the partial channel segment. When the material passes through this electric field, the Joule heating generated due to its internal resistance is relatively uniform. In other words, the core heating zone is located precisely in the partial channel segment of the material channel, and the material must pass through this partial channel segment during flow, thus improving the consistency of the graphitized product. Furthermore, setting the first surface of the electrodes facing the material channel as an arc surface can, to a certain extent, increase the flow area of ​​the material passing through the core heating zone, so that as much material as possible passes through the core heating zone, further improving the consistency of the graphitized product.

[0063] The graphitization furnace described in this application can be applied to any graphite production system, such as sintering and graphitization systems for carbon materials, graphitization systems for PI films, graphitization systems for thermally conductive materials, sintering and graphitization systems for carbon fiber ropes / carbon fiber filaments, graphite purification systems, etc. This application does not limit the specific application scenario of this graphitization furnace.

[0064] As an example, in some practical applications, the graphite material produced by the graphitization furnace involved in this application can be used as the negative electrode material of a battery. That is, in this application, the graphitization furnace can be used in a battery production system. This graphitization furnace can be used as a type of process equipment in a battery production line.

[0065] Figure 1A schematic structural diagram of a graphitization furnace 10 provided in an embodiment of this application is shown. Figure 2 The diagram shows a top cross-sectional view of a graphitization furnace 10 provided in an embodiment of this application.

[0066] like Figure 1 As shown, the graphitization furnace 10 includes: a furnace body 100 and at least one pair of electrodes 200. A material channel 101 is provided within the furnace body 100. Each pair of electrodes 200 is arranged opposite to each other along the radial direction of the material channel 101 and has a gap, which forms a portion of the channel segment of the material channel 101. The two electrodes 200 in each pair have opposite polarities, such as... Figure 2 As shown, the first surface 210 of the electrode 200 facing the material channel 101 is an arc surface.

[0067] Optionally, such as Figure 1 As shown, the material channel 101 can penetrate the furnace body 100. After the carbon material is converted into graphite material through the material channel 101, it can be output to the outside of the furnace body 100 through the material channel 101.

[0068] Optionally, the carbon material (hereinafter referred to as the material) may be, for example, a carbonaceous material such as petroleum coke, coal coke, and asphalt.

[0069] Alternatively, the furnace body 100 can be cylindrical.

[0070] Optionally, continue to refer to Figure 1 The graphitization furnace 10 may include a furnace cover 102.

[0071] Optionally, the material channel 101 may extend in a direction parallel to the direction of gravity, allowing the material entering the material channel 101 to flow within it under the influence of gravity. Alternatively, in other alternative embodiments, the material channel 101 may extend in other directions. In such embodiments, other auxiliary components may be provided inside the furnace body 100 to drive the material to flow within the material channel 101.

[0072] like Figure 2 As shown, each pair of electrodes 200 includes a positive electrode 200a and a negative electrode 200b. The positive electrode 200a and negative electrode 200b can penetrate the wall of the furnace body 100, with at least a portion of each electrode located outside the furnace body 100. The portions of the positive electrode 200a and negative electrode 200b located outside the furnace body 100 can be connected to a power source via a connector, so that when the power is turned on, an electric field is formed between the portions of the positive electrode 200a and negative electrode 200b located inside the furnace body 100, thereby heating the material passing through the material channel 101.

[0073] Optionally, the positive electrode 200a and the negative electrode 200b can be graphite electrodes.

[0074] Optionally, the ash content of the graphite electrode material can be less than 1%. Ash content refers to the content of solid elements other than carbon and graphite in the graphite electrode. When electrode 200 is a graphite electrode, setting the ash content of the graphite electrode to less than 1% can solve the problem of excessive ash introduction affecting the quality of electrode 200.

[0075] Optionally, the particle size of the graphite electrode material can be greater than 2 mm. Smaller particle sizes result in higher density of the graphite electrode, but relatively lower flexural strength. Graphite electrodes generally do not use excessively small-particle graphite materials. Firstly, small-particle graphite electrodes are prone to internal cracking during production, and secondly, they may break under high-temperature use, affecting their lifespan. Therefore, after extensive experimental verification, setting the particle size of the graphite electrode 200 to be greater than 2 mm when electrode 200 is a graphite electrode can improve its lifespan.

[0076] Optionally, the compressive strength of the graphite electrode material can be greater than or equal to 30 MPa. Since the electrode 200 penetrates through the furnace body 100, it also needs to withstand a certain pressure. Therefore, after extensive experimental verification, when the electrode 200 is a graphite electrode, setting its compressive strength to be greater than or equal to 30 MPa can further increase its service life.

[0077] It should be noted that the electrode 200 described in this application can be a positive electrode 200a or a negative electrode 200b, and the two can have the same structure.

[0078] Continue to refer to Figure 1 Inside the furnace body 100, each pair of electrodes 200 is arranged opposite to each other along the radial direction of the material channel 101, that is, the positive electrode 200a and the negative electrode 200b of each pair of electrodes 200 are arranged opposite to each other along the radial direction of the material channel 101. Each pair of electrodes 200 has a gap, which forms a partial channel segment of the material channel 101. In other words, the first surface 210 of the positive electrode 200a and the negative electrode 200b facing the material channel 101 can serve as the channel wall of a partial channel segment in the material channel 101. In this embodiment, the positive electrode 200a and the negative electrode 200b of each pair of electrodes are arranged opposite to each other along the radial direction of the material channel 101, so that the electric field formed by the electrodes 200 is located in the channel segment through which the material must flow, and the electric field is uniformly distributed, that is, the core heating zone is located in this partial channel segment. In this way, the core heating zone can concentrate the heating of the material passing through this partial channel segment, so that the graphitization degree of the material is consistent, thereby improving the consistency of the graphitized product.

[0079] The first surface 210 of the positive electrode 200a and the negative electrode 200b facing the material channel 101 is an arc surface. It should be understood that when the first surface 210 of the electrode is an arc surface, compared to a flat surface, the circumferential dimension of the first surface 210 can be adjusted according to the required magnitude of the electric field. For example, increasing the circumferential dimension of the first surface 210 can, to a certain extent, increase the area of ​​the electric field formed by the positive electrode 200a and the negative electrode 200b. Specifically, it increases the cross-sectional area for material entering the electric field. In other words, this increased electric field area allows as much material as possible to pass through the core heating zone formed by the electric field, thereby further improving the consistency of the graphitized product.

[0080] In this embodiment, at least one pair of electrodes 200 are arranged opposite each other along the radial direction of the material channel 101. This allows a uniform electric field to be formed in a portion of the material channel 101, where the core heating zone is located. As the material passes through this portion of the material channel 101, the degree of graphitization of the material remains consistent, thereby improving the consistency of the graphitized product. Furthermore, when the first surface 210 of the electrode 200 facing the material channel 101 is an arc surface curved circumferentially along the material channel 101, the circumferential dimension of the arc surface can be adjusted to increase the cross-sectional area of ​​the material entering the electric field, maximizing the amount of material passing through the core heating zone and further improving the consistency of the graphitized product.

[0081] According to some embodiments of this application, optionally, such as Figure 3 As shown, along the extending direction of the material channel 101, the dimension of the first surface 210 is L1, and the dimension of the wall of the furnace body 100 is L2. L1 and L2 satisfy: 3 <L2 / L1<9。

[0082] It should be understood that along the extension direction of the material channel 101, the wall dimension L2 of the furnace body 100 can be understood as the length dimension of the furnace body 100, that is, the length dimension of the graphitization furnace 10 excluding the furnace cover 102.

[0083] As described above, the first surface 210 of the electrode 200a and the negative electrode 200b facing the material channel 101 can serve as the channel wall for a portion of the channel segment in the material channel 101. When the dimension L1 of the first surface 210 along the extension direction of the material channel 101 is too long compared to the length L2 of the furnace body 100 wall, it will result in an excessively large electric field region, i.e., an excessively large core heating zone, extending the unnecessary heating time, thus wasting electrode 200 material and increasing the manufacturing cost of the graphitization furnace 10. When the length L1 of the first surface 210 is too short compared to the length L2 of the furnace body 100 wall, it will also result in an excessively small electric field region, i.e., an excessively small core heating zone, which cannot achieve the minimum heating time required for graphitization processing, thus failing to meet the quality requirements of the graphitized product.

[0084] The above embodiments, after extensive experimental verification, show that by setting the ratio L2 / L1 of the wall dimension L2 of the furnace body 100 to the dimension L1 of the first surface 210 within the range of 3 to 9 along the extension direction of the material channel 101, the graphitization furnace 10 can meet the quality requirements of graphitized products while reducing the manufacturing cost of the graphitization furnace 10.

[0085] Optionally, the value of L2 / L1 can be 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8 or 8.5.

[0086] Optionally, in some embodiments, L1 and L2 satisfy: 6 <L2 / L1<8。

[0087] Optionally, the value of L2 / L1 can be 6.3, 6.8, 7.1 or 7.8.

[0088] Figure 4 A schematic structural diagram of another graphitization furnace 10 according to an embodiment of this application is shown. Figure 5 This is a top-view cross-sectional view of another graphitization furnace 10.

[0089] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, the electrode 200 may include an arc-shaped electrode portion 220. Along the radial direction of the material channel 101, the arc-shaped electrode portion 220 protrudes from the inner wall 1011 of the material channel 101, wherein the first surface 210 is the surface of the arc-shaped electrode portion 220 facing the material channel 101.

[0090] It should be noted that the portion of electrode 200 that protrudes from the inner wall of material channel 101 can be referred to as arc-shaped electrode portion 220.

[0091] Optionally, such as Figure 2 As shown, the second surface 221 of the arc-shaped electrode portion 220 near the material inlet can be a plane.

[0092] Specifically, when the second surface 221 of the arc-shaped electrode portion 220 is a plane, when the material flows through the material channel 101, a sloping accumulation can be formed above the second surface 221. The sloping surface is high near the inner wall 1011 and low away from the inner wall 1011, which allows the material after entering the material channel 101 to enter the core heating zone formed by the electric field in an inverted platform shape or umbrella shape. This can gather the material so that more material passes through the core heating zone for heating, thereby improving the consistency of the graphitized product.

[0093] Optionally, the second surface 221 of the arc electrode portion 220 can also be a slope or an arc surface. The slope or arc surface is high near the inner wall 1011 and low away from the inner wall 1011. This means that the material can enter the core heating zone of the electric field in an inverted platform or umbrella shape without material accumulation, thereby reducing material waste and improving the consistency of graphitization furnace products.

[0094] In the above embodiment, by protruding the arc-shaped electrode portion 220 onto the inner wall 1011 of the material channel 101, the material entering the material channel 101 can enter the core heating zone formed by the electric field in an inverted platform shape or an umbrella shape. This can gather the material so that more material passes through the core heating zone for heating, thereby improving the consistency of the graphitized product.

[0095] According to some embodiments of this application, optionally, such as Figure 4 As shown, along the radial direction of the material channel 101, the thickness of the arc-shaped electrode portion 220 is T, and the inner diameter of the channel section before the material enters the gap in the material channel 101 is R. T and R satisfy: 4 <R / T<10。

[0096] In other words, continue to refer to Figure 4 In this embodiment, the inner diameter R of the channel segment in the material channel 101 before the material enters the gap refers to the inner diameter of a portion of the channel segment of the material channel 101 that the material flows through before entering the gap (the electric field formed by the electrode 200).

[0097] When the thickness T of the arc-shaped electrode portion 220 is too small compared to the inner diameter R of the channel section before the material enters the gap in the material channel 101, the degree of polymerization of the material passing through the core heating zone is not significant, nor is the improvement in the consistency of the graphitized product significant. When the thickness T of the arc-shaped electrode portion 220 is too large compared to the inner diameter R of the channel section before the material enters the gap in the material channel 101, it will affect the flow rate of the material in the material channel 101, and may even cause the material to block the material channel 101.

[0098] In the above embodiments, after extensive experimental verification, by setting the ratio of the inner diameter R of the channel section before the material enters the gap in the material channel 101 to the thickness T of the arc electrode part 220 within 4 to 10, the flowability of the material in the material channel 101 can be taken into account, and the consistency of the graphitized products of the graphitization furnace 10 can be improved.

[0099] Optionally, the value of R / T can be 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9 or 9.5.

[0100] Optionally, in some embodiments, the ratio of the inner diameter R of the channel section before the material enters the gap in the material channel 101 to the thickness T of the arc-shaped electrode portion 220 can satisfy: 5 <R / T<6。

[0101] Alternatively, the value of R / T can be 5.2, 5.4, 5.7 or 5.9.

[0102] According to some embodiments of this application, optionally, such as Figure 6 As shown, an insulating member 300 can be provided between the two arc-shaped electrode portions 220 along the circumferential direction of the material channel 101.

[0103] In this embodiment, the insulating member 300 can separate two adjacent arcuate electrode portions 220 having the same or opposite polarities.

[0104] Specifically, when there is no insulating member 300 between adjacent arc-shaped electrode portions 220, and when the power supply is applied to all electrodes 200, an electric field can be formed between the opposite end faces of two adjacent arc-shaped electrode portions 220 with opposite polarities, resulting in uneven electric field distribution, which in turn causes the core heating area to shift, affecting the consistency of the graphitized product.

[0105] Optionally, the insulating member 300 may be an insulating sleeve, which may be fitted onto the end face of the arc-shaped electrode portion 220, the end face being the end face of the arc-shaped electrode portion 220 extending in the circumferential direction.

[0106] Optionally, the dimension of the insulating member 300 along the extension direction of the material channel 101 may be equal to or different from the dimension L1 of the arcuate electrode portion 220 along the extension direction of the material channel 101. This application does not limit this.

[0107] Optionally, the third surface of the insulating member 300 near the material inlet of the material channel 101 may be flush with or not flush with the second surface 221 of the arc-shaped electrode portion 220, and this application does not limit this.

[0108] In the above embodiment, by providing an insulating member 300 between two adjacent arc-shaped electrode portions 220, the probability of generating an electric field between the two adjacent arc-shaped electrode portions 220 can be reduced, thereby improving the uniformity of the electric field between the opposing arc-shaped electrode portions 220 and thus improving the consistency of the graphitized product.

[0109] According to some embodiments of this application, optionally, the insulating element 300 is embedded between two adjacent arcuate electrode portions 220.

[0110] Specifically, when no insulating element 300 is provided between adjacent arc-shaped electrode portions 220, there will be a gap between them. Some material can pass through this gap without passing through the core heating zone, affecting the consistency of the graphitized product. Embedding the insulating element 300 between two arc-shaped electrode portions 220 allows for a tight connection between the end face of the arc-shaped electrode portion 220 and the insulating element 300, reducing the probability of material bypassing the core heating zone and thus improving product consistency.

[0111] In one embodiment, the insulating member 300 can be made according to the shape of the gap between the two arc-shaped electrode portions 220, so that the insulating member 300 is just embedded between the two adjacent arc-shaped electrode portions 220.

[0112] Optionally, the insulating part 300 and the arc-shaped electrode part 220 can be connected by adhesive bonding, or they can be connected by other means. This application does not limit this.

[0113] In the above embodiments, by providing an insulating member 300 between two adjacent arc-shaped electrode portions 220, the probability of material flowing between the two arc-shaped electrode portions 220 without flowing through the core heating zone can be reduced, thereby improving the consistency of the graphitized product.

[0114] Optionally, according to some embodiments of this application, reference may continue to be made to... Figure 6 The insulating component 300 can be in the shape of an arc.

[0115] It should be noted that, in the embodiments of this application, the arc body refers to an arc body in which two surfaces are bent in the same direction and are arranged opposite each other.

[0116] In this embodiment, the arc-shaped electrode portion 220 is arc-shaped. Setting the insulating member 300 to an arc shape can improve the fit between the insulating member 300 and two adjacent arc-shaped electrode portions 220, and enhance the connection between the insulating member 300 and the arc-shaped electrode portion 220.

[0117] Optionally, according to some embodiments of this application, reference may continue to be made to... Figure 6 The insulating component 300 can form a ring with all the arc-shaped electrode portions 220.

[0118] Specifically, the thickness dimension of the insulating member 300 in the radial direction along the material channel 101 can be equal to the thickness dimension T of the arc-shaped electrode portion 220, so that the insulating member 300 can form a ring with all the arc-shaped electrode portions 220.

[0119] This allows the material entering the electric field to more closely resemble a complete inverted frustum or umbrella shape, which further concentrates the material, allowing more material to pass through the core heating zone for heating, thereby improving the consistency of the graphitized product.

[0120] According to some embodiments of this application, optionally, the sum of the circumferential dimensions of all the arc-shaped electrode portions 220 is Ct, and the circumferential dimension of the annulus is C, where Ct and C satisfy: 0.5 <Ct / C<1。

[0121] Optionally, the circumferential dimension C of the ring can be either the inner diameter or the outer diameter of the ring. When the circumferential dimension C of the ring is the inner diameter of the ring, the circumferential dimension of the arc-shaped electrode portion 220 can be understood as the circumferential dimension of the first surface 210. When the circumferential dimension C of the ring is the outer diameter of the ring, i.e., the circumferential dimension of the inner wall 1011, the circumferential dimension of the arc-shaped electrode portion 220 is the circumferential dimension of the arc-shaped electrode portion 220 near the inner wall 1011.

[0122] Taking the circumference C of the ring as the outer diameter of the ring, and the furnace body 100 including two pairs of electrodes 200 as an example, as... Figure 7 As shown, the circumferential dimension of the arc-shaped electrode portion 220 is C1. When all the arc-shaped electrode portions 220 have the same shape, the sum of the circumferential dimensions of all the arc-shaped electrode portions 220 is Ct = 4 * C1.

[0123] When the sum of the circumferential dimensions of all the arc-shaped electrode sections 220 is too small compared to the size of the annulus, the area of ​​the electric field formed by the electrode 220 is too small, i.e., the core heating zone is too small, which cannot meet the quality requirements of the graphitized product. When the sum of the circumferential dimensions of all the arc-shaped electrode sections 220 is too large compared to the size of the annulus, taking the graphitization furnace 10 as an example with only one pair of electrodes, the distance between the ends of the positive electrode 200a and the negative electrode 200b along the circumferential direction will be infinitely close, which will cause the electric field to be uneven and affect the consistency of the graphitized product.

[0124] Alternatively, the value of Ct / C can be 0.6, 0.7, 0.8, or 0.9.

[0125] In the above embodiments, after extensive experimental verification, the ratio of the sum of the circumference dimensions Ct of all the arc electrode portions 220 to the circumference dimension C of the ring is set between 0.5 and 1. This can improve the consistency of graphitized products while meeting the quality requirements of graphitized products.

[0126] Optionally, Ct and C satisfy: 0.5 <Ct / C<0.75。

[0127] Alternatively, the value of Ct / C can be 0.62, 0.65, 0.7, or 0.72.

[0128] According to some embodiments of this application, optionally, such as Figure 8 As shown, the insulating component 300 may include an insulating protrusion 301, which protrudes into the wall of the furnace body 100 along the radial direction of the material channel 101.

[0129] Specifically, at least a portion of the insulating element 300 may be located within the furnace body 100, and the portion of the insulating element 300 located within the furnace body 100 may be referred to as the insulating protrusion 301.

[0130] By setting the insulating protrusion 301 inside the furnace body 100, the furnace body 100 has a certain clamping effect on the insulating component 300 with the insulating protrusion 301, which can reduce the probability of the insulating component 300 falling between two adjacent arc-shaped electrode portions 220.

[0131] Optionally, the insulating protrusion 301 can be arc-shaped, similar to a tile. Of course, the insulating protrusion 301 can also be other shapes, and this application does not limit this.

[0132] Optionally, continue to refer to Figure 8 When the insulating protrusion 301 is arc-shaped, the inner circumferential dimension C2 of the insulating member 300 can be larger than the outer circumferential dimension C3 of the insulating protrusion 301. This increases the overall strength of the insulator 300 and further reduces the probability of the insulating member 300 falling between two adjacent arc-shaped electrode portions 220.

[0133] Optionally, the inner circumferential dimension C2 of the insulating member 300 may also be smaller than the outer circumferential dimension C3 of the insulating protrusion 301, and this application does not limit this.

[0134] Optionally, according to some embodiments of this application, a discharge channel section 1012 is provided at one end of the material channel 101 along its extension direction. The inner wall of the discharge channel section 1012 may be flush with the first surface 210 along the extension direction of the material channel 101.

[0135] Along the radial direction of the material channel 101, when the inner wall of the discharge channel section 1012 protrudes from the first surface 210, the material will accumulate on the fourth surface of the discharge channel section 1012 near the inlet. The material accumulated on the fourth surface is always in the electric field, that is, the material is always in a heated state, which affects the consistency of the graphitized product.

[0136] In the above embodiments, by setting the inner wall of the discharge channel section 1012 to be flush with the first surface 210 along the extension direction of the material channel 101, the probability of material accumulating in the electric field can be reduced, thereby reducing the phenomenon of the accumulated material being continuously heated, and thus improving the consistency of graphitized products.

[0137] Optionally, according to some embodiments of this application, reference may continue to be made to... Figure 8 The electrode 200 also includes a current-guiding electrode portion 230, one end of which is connected to the arc-shaped electrode portion 220 and the other end is connected to the power source.

[0138] Optionally, the flow guiding electrode portion 230 can be strip-shaped, such as a square flow guiding electrode portion or a rectangular flow guiding electrode portion.

[0139] Alternatively, the current-guiding electrode portion 230 may also be irregular in shape.

[0140] Optionally, the current-conducting electrode portions of each of at least one pair of electrodes 200 may be the same or different.

[0141] Specifically, at least a portion of the flow-guiding electrode portion 230 is embedded in the furnace body 100, such that one end of the flow-guiding electrode portion 230 can be connected to the arc-shaped electrode portion 220. Specifically, the side of the flow-guiding electrode portion 230 near the arc-shaped electrode portion 220, parallel to the extending direction of the material channel 101, is connected to the arc-shaped electrode portion 220. At least a portion of the flow-guiding electrode portion 230 is located outside the furnace body 100, such that the other end of the flow-guiding electrode portion 230 can be connected to a power source via a connector. When the power is turned on, the flow-guiding electrode portion 230 and the arc-shaped electrode portion 220 are energized. At this time, an electric field is formed between the positive electrode 200a and the negative electrode 200b of the flow-guiding electrode portion 230 and the arc-shaped electrode portion 220, thereby heating the material passing through the electric field.

[0142] Optionally, the area of ​​the connection surface between the current-conducting electrode portion 230 and the arc-shaped electrode portion 220 can be smaller than the cross-sectional area of ​​the arc-shaped electrode portion 220 along the extension direction, as long as the current requirements of the load are met. In addition, the volume of the current-conducting electrode portion 230 can be as small as possible while meeting the requirements of conductivity and load-bearing capacity, so as to reduce the manufacturing cost of the electrode 200.

[0143] In the above embodiments, by providing a fluid-conducting electrode part in the electrode 200 with one end connected to the power supply and the other end connected to the arc-shaped electrode part 220, the volume of the fluid-conducting electrode part 230 can be flexibly set while meeting the requirements of conductivity and load-bearing capacity, so as to reduce the manufacturing cost of the electrode 200 and further reduce the manufacturing cost of the graphitization furnace 10.

[0144] According to some embodiments of this application, the graphitization furnace 10 may optionally include a current controller for sequentially connecting each pair of electrodes 200 to a power supply.

[0145] Electrode 200 can be connected to a power supply via a current controller. The current controller can sequentially energize different electrode pairs at different time periods. In other words, it ensures that current is supplied to only one pair of electrodes 200 at any given time.

[0146] It should be understood that when at least one pair of electrodes 200 or more pairs of electrodes (200) are energized simultaneously, two adjacent electrodes 200 with opposite polarities may form an electric field in a relatively close space, resulting in an uneven distribution of the entire electric field, which in turn affects the consistency of the graphitized product.

[0147] In the above embodiments, by setting a current controller in the graphitization furnace 10 and connecting each pair of electrodes 200 to the power supply in sequence through the current controller, the uniformity of the electric field can be improved, making the temperature of the core heating zone uniform throughout, thereby improving the consistency of the graphitized product.

[0148] According to some embodiments of this application, optionally, such as Figure 9 As shown, the furnace body 100 may include a cylindrical insulation element 400 for forming a material channel 101.

[0149] Specifically, the cylindrical insulation component 400 can form the channel section of the material channel 101 other than the channel section formed by the first surface 210 of the electrode 200.

[0150] Optionally, the cross-sectional shape of the cylindrical insulation component 400 in the radial direction can be adapted to the furnace body 100. For example, if the furnace body 100 is square, the cylindrical insulation component 400 can be a square cylindrical heat-resistant component, that is, its cross-section in the radial direction is square. As another example, if the furnace body 100 is circular, the cylindrical insulation component 400 can be a circular cylindrical heat-resistant component, that is, its cross-section in the radial direction is circular.

[0151] Optionally, the length of the cylindrical insulation member 400 along the extending direction may be greater than the diameter of the cylindrical insulation member 400 along the radial direction. The cylindrical insulation member 400 may have sufficient length to form a material channel 101 inside the furnace body 100, facilitating the flow of material in this channel section.

[0152] Optionally, the cylindrical insulation component 400 can be formed from insulation material, providing thermal insulation. By way of example and not limitation, the cylindrical insulation component 400 can be made of lightweight carbonaceous material. On the one hand, the cylindrical insulation component 400 is lightweight, which can reduce the overall weight of the graphitization furnace 10. On the other hand, the cylindrical insulation component 400 is made of carbonaceous insulation material, which is both heat-resistant and relatively low in cost.

[0153] Optionally, a working lining may be provided on the side of the cylindrical insulation component 400 near the interior of the furnace body 100. The working lining may be made of carbonaceous refractory bricks and may be in direct contact with the material flowing through the material channel 101.

[0154] Optionally, the temperature resistance of the cylindrical insulation element 400 can be between 1450℃ and 2600℃, and it has better insulation properties.

[0155] By designing the insulation component 400 as a cylindrical insulation component 400, this cylindrical insulation component 400 can be reused to form the material channel 101 inside the furnace body 100, thereby reducing the need for other materials used to form the material channel 101. Through this technical solution, the manufacturing cost of the graphitization furnace 10 can be reduced while maintaining its performance.

[0156] According to some embodiments of this application, optionally, the thermal conductivity of the cylindrical insulation element 400 is in the range of 0.2 to 0.5 W / mk.

[0157] The higher the thermal conductivity of a material, the better its thermal conductivity, but the worse its insulation effect. Extensive experimental verification has shown that setting the thermal conductivity of the insulation component 400 within the range of 0.2–0.5 W / mK can improve its insulation effect, reduce the energy consumption of the graphitization furnace 10, and thus extend its service life.

[0158] For example, the thermal conductivity of the cylindrical insulation element 400 may be 0.3 or 0.4.

[0159] According to some embodiments of this application, optionally, such as Figure 9 As shown, the furnace body 100 may also include a heat-resistant component 500, which is disposed on the side of the cylindrical insulation component 400 facing the outside of the furnace body 100.

[0160] Optionally, the heat-resistant component 500 may be composed of, from the outside in, a steel plate, ceramic fiber products, lightweight refractory bricks or castables, and heavyweight refractory bricks or castables.

[0161] By using the technical solution of this application embodiment, a heat-resistant component 500 is provided on the side of the cylindrical heat-insulating component 400 facing the outside of the furnace body 100, which can further insulate the internal space of the furnace body 100, reduce the heat loss inside the furnace body 100 and reduce the energy consumption of the graphitization furnace 10, thereby further improving the service life of the graphitization furnace 10.

[0162] According to some embodiments of this application, optionally, the heat-resistant component 500 can be cylindrical, and the heat-resistant component 500 is fitted around the outer periphery of the cylindrical insulation component 400.

[0163] In this embodiment, the cylindrical insulation component 400 and the cylindrical heat-resistant component 500 are coaxially arranged, and the axial direction of the cylindrical heat-resistant component 500 is the same as the axial direction of the cylindrical insulation component 400.

[0164] Through the technical solution of the embodiments of this application, the cylindrical heat-resistant component 500 has a larger dimension in the axial direction, which can completely cover the periphery of the cylindrical heat-insulating component 400 in the axial direction, thereby achieving a better heat-insulating effect on the cylindrical heat-insulating component 400.

[0165] According to some embodiments of this application, optionally, the thermal conductivity of the heat-resistant component 500 can be greater than that of the cylindrical insulation component 400.

[0166] In the above embodiments, after extensive experimental verification, setting the thermal conductivity of the heat-resistant component 500 to be lower than that of the cylindrical insulation component 400 can improve the insulation effect while reducing the manufacturing cost of the graphitization furnace 10.

[0167] According to some embodiments of this application, optionally, the thermal conductivity of the heat-resistant element 500 ranges from 0.5 to 1.2 W / mk.

[0168] For example, the thermal conductivity of the heat-resistant component 500 can be 0.6, 0.8, 1.1, etc.

[0169] Extensive experimental verification has shown that setting the thermal conductivity of the heat-resistant component 500 to 0.5–1.2 W / mk can improve the heat preservation effect while reducing the manufacturing cost of the graphitization furnace 10.

[0170] This application also provides a battery production system, including the graphitization furnace 10 in any of the above embodiments, the graphitization furnace 10 being used to produce negative electrode graphite material for batteries.

[0171] It is understandable that, in addition to the graphitization furnace 10 for producing the negative electrode graphite material of the battery, the battery production system may also include related equipment for producing other battery materials.

[0172] The battery production system can be a battery production line, in which multiple devices can be located in the same centralized location, or in separate locations.

[0173] It should be noted that only some structures of the graphitization furnace 10 are listed in the above embodiments of this application. In addition to the structures involved in the above embodiments, the graphitization furnace 10 of this application may also include other system structures of graphitization furnaces in related technologies, such as feeding system, discharging system, electrical system of electrodes, electrode clamping system, exhaust treatment system, etc. The relevant technical solutions of each system can be found in the specific descriptions in related technologies, and will not be discussed in detail here.

[0174] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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, comprising: A furnace body (100) is provided with a material channel (101) inside the furnace body; At least one pair of electrodes (200), each pair of electrodes (200) being disposed opposite to each other along the radial direction of the material channel (101) and having a gap, the gap being used to form a partial channel segment of the material channel (101); In each pair of electrodes (200), the two electrodes (200) have opposite polarities, and the first surface (210) of the electrode (200) facing the material channel (101) is an arc surface.

2. The graphitization furnace according to claim 1, wherein, Along the extending direction of the material channel (101), the dimension of the first surface (210) is L1, and the dimension of the wall of the furnace body (100) is L2. L1 and L2 satisfy the following relationship: 3 <L2 / L1<9。 3. The graphitization furnace according to claim 1 or 2, wherein, The electrode (200) includes an arc-shaped electrode portion (220); Along the radial direction of the material channel (101), the arc-shaped electrode portion (220) protrudes from the inner wall (1011) of the material channel (101); The first surface (210) is the surface of the arc-shaped electrode portion (220) facing the material channel (101).

4. The graphitization furnace according to claim 3, wherein, Along the radial direction of the material channel (101), the thickness of the arc-shaped electrode portion is T, and the inner diameter of the channel section in the material channel (101) before the material enters the gap is R. T and R satisfy: 4 <R / T<10。 5. The graphitization furnace according to claim 3, wherein, An insulating element (300) is provided between two adjacent arc-shaped electrode portions (220) along the circumferential direction of the material channel (101).

6. The graphitization furnace according to claim 5, wherein, The insulating element (300) is embedded between two adjacent arcuate electrode portions (220).

7. The graphitization furnace according to claim 5, wherein, The insulating component (300) is in the shape of an arc.

8. The graphitization furnace according to claim 5, wherein, The insulating element (300) forms an annulus with all the arcuate electrode portions (220).

9. The graphitization furnace according to claim 8, wherein, The sum of the circumferential dimensions of all the said arc-shaped electrode portions (220) is Ct, and the circumferential dimension of the ring is C. Ct and C satisfy: 0.5 <Ct / C<1。 10. The graphitization furnace according to claim 5, wherein, The insulating component (300) further includes an insulating protrusion (301) that protrudes into the wall of the furnace body (100) along the radial direction of the material channel (101).

11. The graphitization furnace according to claim 3, wherein, Along the extending direction of the material channel (101), a discharge channel section (1012) is provided at one end of the material channel (101); The inner wall of the discharge channel section (1012) is flush with the first surface (210) along the extension direction of the material channel (101).

12. The graphitization furnace according to claim 3, wherein, The electrode (200) further includes a current-guiding electrode section (230), one end of which is connected to the arc-shaped electrode section (220), and the other end is connected to a power source.

13. The graphitization furnace according to claim 1, wherein, The graphitization furnace also includes a current controller for sequentially connecting each pair of electrodes to a power source.

14. The graphitization furnace according to claim 1, wherein, The furnace body (100) includes a cylindrical insulation component (400) for forming the material channel (101).

15. The graphitization furnace according to claim 14, wherein, The thermal conductivity of the cylindrical insulation component (400) ranges from 0.2 to 0.5 W / mk.

16. The graphitization furnace according to claim 14, wherein, The furnace body (100) also includes a heat-resistant component (500) disposed on the side of the cylindrical heat-insulating component (400) facing the outside of the furnace body (100).

17. The graphitization furnace according to claim 16, wherein, The heat-resistant component (500) is cylindrical and is fitted around the outer periphery of the cylindrical heat-insulating component (400).

18. The graphitization furnace according to claim 16, wherein, The thermal conductivity of the heat-resistant component (500) is greater than that of the cylindrical insulation component (400).

19. The graphitization furnace according to claim 18, wherein, The thermal conductivity of the heat-resistant component (500) ranges from 0.5 to 1.2 W / mk.

20. A battery production system, comprising: The graphitization furnace according to any one of claims 1 to 19, wherein the graphitization furnace is used to produce negative electrode graphite material for batteries.

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