Graphitization furnace, control method thereof and preparation device of battery

Abstract

The embodiment of the invention provides a graphitization furnace, a control method of the graphitization furnace and a preparation device of a battery. The graphitization furnace comprises a furnace body provided with a material channel; the first electrode extends in the first direction, at least part of the first electrode is arranged in the material channel, and the first direction is the extending direction of the material channel; the second electrode and the first electrode are arranged at intervals in the second direction, and the second direction is the radial direction of the material channel; wherein the polarities of the first electrode and the second electrode are opposite, the first surface of the first electrode and the second surface of the second electrode are oppositely arranged, and a part of the material channel is formed between the first surface and the second surface. According to the graphitization furnace disclosed by the embodiment of the invention, the consistency of products can be improved.

Description

Graphitization furnace and control method thereof, and battery preparation device Technical Field

[0001] The present application relates to the field of graphite processing technology, and in particular to a graphitization furnace and a control method thereof, and a battery preparation device. Background Art

[0002] The carbon atoms in carbonaceous materials are irregularly arranged. Only through high-temperature heat treatment can the carbon atoms recrystallize and rearrange themselves in an orderly manner to present the crystal structure of graphite. This allows the material to possess many excellent properties of graphite, such as significantly improved electrical and thermal conductivity, better chemical and thermal stability, reduced impurities, lower hardness, and easier machining. The function of a graphitization furnace is to convert carbonaceous materials into artificial graphite materials, such as providing high-quality carbon element graphite materials for steel smelting, aluminum smelting, cathode materials, other non-ferrous metal industries, and the nuclear industry.

[0003] Traditional graphitization furnaces have the problem of being unable to heat centrally and having poor product consistency.

[0004] Summary of the Invention

[0005] In view of this, the embodiments of the present application provide a graphitization furnace and a control method thereof, and a battery preparation device, which can improve product consistency.

[0006] In a first aspect, a graphitization furnace is provided, comprising: a furnace body provided with a material channel; a first electrode extending along a first direction, at least a portion of the first electrode being arranged in the material channel, the first direction being the extension direction of the material channel; a second electrode spaced apart from the first electrode in a second direction, the second direction being the radial direction of the material channel, the first electrode and the second electrode having opposite polarities; wherein a first surface of the first electrode and a second surface of the second electrode are arranged opposite to each other, and the first surface of the first electrode and the second surface of the second electrode form a portion of the material channel.

[0007] In this embodiment, the first electrode and the second electrode are radially spaced apart in the material channel, and the first surface of the first electrode and the second surface of the second electrode are arranged opposite to each other, so that the core heating area is distributed between the first surface and the second surface. Moreover, since a part of the material channel is formed between the first surface and the second surface, that is, the material will inevitably pass through the core heating area between the first surface and the second surface when flowing in the material channel, thereby making it possible to keep the graphitization degree of the material consistent in the graphitization furnace, thereby improving the consistency of the product.

[0008] In a possible implementation, the first surface and the second surface are both parallel to the first direction, and the first surface and the second surface are parallel to each other.

[0009] In this embodiment, the first surface and the second surface are both parallel to the first direction, and the first surface and the second surface are arranged to be parallel to each other, so that the electric field formed between the first surface and the second surface is evenly distributed, so that the heating degree of the material at each location between the first surface and the second surface is consistent, thereby improving the consistency of the product; in addition, since the electric field formed between the first surface and the second surface is evenly distributed, it is possible to reduce the coking of the material at each location between the first surface and the second surface due to inconsistent temperature, thereby improving the fluidity of the material in the furnace.

[0010] In a possible implementation, the second electrode includes at least one pair of electrode columns arranged around the first electrode, and at least a portion of each electrode column in the at least one pair of electrode columns is inserted into the furnace body along the second direction.

[0011] In this embodiment, the second electrode includes electrode columns arranged in pairs, which can increase the heating area of ​​the material and make the material heated evenly at all locations, thereby improving the consistency of the product.

[0012] In a possible implementation, the two electrode columns in each pair of the at least one pair of electrode columns are symmetrically arranged relative to the central axis of the first electrode.

[0013] In this embodiment, the two electrode columns in each pair of electrode columns are symmetrically arranged relative to the central axis of the first electrode, so that the two heating areas formed between the two electrode columns in each pair of electrode columns and the first electrode are symmetrical relative to the central axis of the first electrode, which is beneficial for making the electric field distribution of the two symmetrical heating areas uniform when controlling the electrode columns in pairs, thereby improving the heating uniformity of the material when passing through the two symmetrical heating areas, and improving the consistency of the product.

[0014] In one possible implementation, at least one pair of electrode columns includes multiple pairs of electrode columns, each electrode column in the multiple pairs of electrode columns has the same size in the first direction, and the third surface of each electrode column is flush, and the third surface is the surface of each electrode column closest to the entrance of the material channel in the first direction.

[0015] In this embodiment, the second electrode includes multiple pairs of electrode columns, and each electrode column in the multiple pairs of electrode columns has the same size in the first direction and the third surface of each electrode column is flush, which is conducive to graphitizing the material in the heating area at the same height, reducing the inconsistency of the heating degree of the material during the flow process, thereby improving the consistency of the product.

[0016] In one possible implementation, at least one pair of electrode columns includes multiple pairs of electrode columns, each electrode column in the multiple pairs of electrode columns has the same size in the first direction, and the third surface of each electrode column in at least two electrode columns in the multiple pairs of electrode columns is not flush, and the third surface is the surface of each electrode column closest to the entrance of the material channel in the first direction.

[0017] In this embodiment, the second electrode includes multiple pairs of electrode columns, and each electrode column in the multiple pairs of electrode columns has the same size in the first direction and the third surface of each electrode column is not flush, which can form graphitized regions of the material at different heights of the material channel. The graphitized regions are dispersed at different heights of the first electrode for heating, which can reduce damage to the first electrode, thereby improving the service life of the graphitization furnace.

[0018] In a possible implementation, the angles between any two adjacent electrode columns in the multiple pairs of electrode columns projected on the first plane are equal, and the first plane is perpendicular to the first direction.

[0019] In this embodiment, the angles between any two adjacent electrode columns among the multiple pairs of electrode columns projected on the first plane are equal, that is, the multiple pairs of electrode columns are evenly distributed along the circumference of the material channel, which can make the electric field in the graphitization furnace evenly distributed along the circumference of the material channel, thereby improving the heating uniformity of the material during the flow process and improving the consistency of the product.

[0020] In a possible implementation, the second electrode includes: a conductive ring disposed around the first electrode, and an inner surface of the conductive ring is the second surface.

[0021] In this embodiment, the second electrode includes a conductive ring, which is arranged around the first electrode so that the inner surface of the conductive ring is the second surface of the second electrode. This electrode arrangement is simple and easy to implement. In addition, since the conductive ring is arranged around the first electrode, the entire circumference of the material channel can have a heating area, thereby improving the uniformity of heating of the material during the flow process and improving the consistency of the product.

[0022] In a possible implementation manner, the conductive ring is coaxially disposed with the first electrode.

[0023] In this embodiment, the conductive ring is coaxially arranged with the first electrode, which is beneficial to uniform distribution of the electric field in the radial direction of the material channel and uniform distribution of the heating area of ​​the material, thereby improving the consistency of the product.

[0024] In a possible implementation, a shape of a cross section of an inner surface of the conductive ring perpendicular to the first direction is the same as a shape of a cross section of an outer surface of the first electrode perpendicular to the first direction.

[0025] In this embodiment, the shape of the cross-section of the inner surface of the conductive ring perpendicular to the first direction is set to be the same as the shape of the cross-section of the outer surface of the first electrode perpendicular to the first direction, so that the inner surface of the conductive ring and the outer surface of the first electrode are parallel to each other, so that a uniform electric field can be formed between the inner surface of the conductive ring and the outer surface of the first electrode, so that the degree of graphitization of the material in the graphitization furnace remains consistent, thereby improving the consistency of the product.

[0026] In one possible implementation, the distance between the fourth surface of the first electrode and the entrance of the material channel is less than or equal to the distance between the fifth surface of the second electrode and the entrance of the material channel, the fourth surface is the surface of the first electrode farthest from the entrance of the material channel in the first direction, and the fifth surface is the surface of the second electrode farthest from the entrance of the material channel in the first direction.

[0027] In this embodiment, the distance between the fourth surface of the first electrode and the entrance of the material channel is set to be less than or equal to the distance between the fifth surface of the second electrode and the entrance of the material channel, which is beneficial to avoiding the problem of part of the first electrode being mixed into the material due to the melting of the first electrode, thereby improving the purity of the graphitized material, and at the same time reducing the wear of the graphitization furnace by the first electrode after the melting, thereby increasing the life of the graphitization furnace.

[0028] In a possible implementation, the first electrode is a cylindrical electrode.

[0029] In this embodiment, the first electrode is a cylindrical electrode, which can reduce the need for improvement of the existing electrode structure, thereby reducing the cost of the graphitization furnace.

[0030] In a possible implementation, the diameter of the first electrode is 500 mm-700 mm.

[0031] In a possible implementation, the graphitization furnace includes: a furnace inner lining, which is arranged around the inner wall of the furnace body; wherein the furnace inner lining completely covers the surface of the second electrode in the furnace body that is perpendicular to the first direction.

[0032] In this embodiment, a furnace lining is arranged around the inner wall of the furnace body, which can provide thermal insulation for the high temperature inside the furnace body; in addition, the furnace lining completely covers the surface of the second electrode in the furnace body that is perpendicular to the first direction, which can limit the material channel so that the material can only pass through the heating area between the first surface and the second surface, thereby improving the consistency of the product; at the same time, it can also reduce the possibility of material accumulation on the surface of the second electrode in the furnace body that is perpendicular to the first direction, thereby improving the fluidity of the material.

[0033] In a possible implementation, the furnace lining includes: a thermal insulation layer and a temperature-resistant layer. The temperature-resistant layer is arranged around the thermal insulation layer, and the thermal conductivity of the thermal insulation layer is lower than that of the temperature-resistant layer.

[0034] In this embodiment, a multi-layer thermal insulation furnace lining is provided to increase the service life of the graphitization furnace. In addition, the thermal conductivity of the thermal insulation layer is set to be lower than that of the heat-resistant layer, which can improve the thermal insulation effect while reducing the cost of the graphitization furnace.

[0035] In a possible implementation, the first electrode is a graphite electrode, and / or the second electrode is a graphite electrode.

[0036] In a possible implementation, the material channel extends in a vertical direction.

[0037] In a second aspect, a control method for a graphitization furnace is provided, the graphitization furnace comprising a furnace body, a first electrode, and a second electrode, the furnace body being provided with a material channel, the first electrode extending along a first direction and at least a portion of the first electrode being provided in the material channel, the first direction being the extension direction of the material channel, the second electrode being spaced apart from the first electrode in a second direction, the second direction being the radial direction of the material channel, the control method comprising: during a graphitization process, controlling the first electrode and the second electrode to be energized to form an electric field between a first surface of the first electrode and a second surface of the second electrode being arranged opposite to each other, the first surface and the second surface forming a portion of the material channel.

[0038] In one possible implementation, the second electrode includes multiple pairs of electrode columns arranged around the first electrode, and the two electrode columns in each pair of the multiple pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode. During the graphitization process, the second electrode is controlled to be energized, including: during the graphitization process, controlling the multiple pairs of electrode columns to be energized at the same time.

[0039] In one possible implementation, the second electrode includes multiple pairs of electrode columns arranged around the first electrode, and the two electrode columns in each pair of the multiple pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode. During the graphitization process, the second electrode is controlled to be energized, including: during the graphitization process, each pair of electrode columns in the multiple pairs of electrode columns is controlled to be energized in turn.

[0040] In a third aspect, a battery preparation device is provided, comprising the graphitization furnace according to the first aspect and any one of the implementations of the first aspect, wherein the graphitization furnace is used to prepare a negative electrode material for a battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0042] FIG1 is a front view of a graphitization furnace.

[0043] FIG2 is a cross-sectional view of a graphitization furnace provided in one embodiment of the present application.

[0044] FIG3 is a perspective view of a graphitization furnace provided in one embodiment of the present application.

[0045] FIG4 is a cross-sectional view of a graphitization furnace provided in another embodiment of the present application.

[0046] FIG5 is a top view of a graphitization furnace provided in one embodiment of the present application.

[0047] FIG6 is a top view of a graphitization furnace provided in another embodiment of the present application.

[0048] FIG7 is a cross-sectional view of a graphitization furnace provided in yet another embodiment of the present application.

[0049] FIG8 is a schematic block diagram of a method for controlling a graphitization furnace according to an embodiment of the present application.

[0050] FIG9 is a schematic block diagram of a battery manufacturing apparatus according to an embodiment of the present application.

[0051] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0052] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0054] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] With the development of new energy sources, lithium-ion batteries are increasingly favored by investors. As a key component of lithium-ion batteries, the market for carbon anode materials is also experiencing explosive growth. A key step in the production of carbon anode materials is graphitization. Graphitization involves the transformation of a random, irregular arrangement of carbon atoms into a regularly arranged hexagonal planar network structure, known as graphite microcrystals, at high temperatures. This transformation aims to achieve graphite's properties, including high electrical and thermal conductivity, as well as corrosion and friction resistance. During the graphitization process, the higher the temperature, the more complete the graphite microcrystal structure develops, resulting in a higher degree of graphitization. The equipment used to perform graphitization is called a graphitization furnace.

[0056] The electrode pair in a traditional graphitization furnace includes a cylindrical electrode placed vertically at the center of the material channel and a horizontally placed annular electrode located in the lower middle portion of the furnace body. The cylindrical electrode is the positive electrode, while the annular electrode is the negative electrode. An umbrella-shaped or frustum-shaped graphitization region is formed between the lower surface of the positive electrode and the inner surface of the negative electrode. After passing through this graphitization region, the material can be graphitized. With this electrode pair arrangement, the electric field in the area directly below the positive electrode is denser than the electric field on the sides below the positive electrode, resulting in the core heating area being concentrated in the area directly below the positive electrode. When the material flows in the material channel, part of it will pass through the area directly below the positive electrode, while the other part will pass through the areas on the sides below the positive electrode. This results in inconsistent graphitization of the material in the graphitization furnace, resulting in poor product consistency.

[0057] Therefore, an embodiment of the present application provides a graphitization furnace, wherein the first electrode and the second electrode are arranged at intervals in the radial direction of the material channel, and the first surface of the first electrode and the second surface of the second electrode are arranged relative to each other, so that the core heating area is distributed between the first surface and the second surface, and since a part of the material channel is formed between the first surface and the second surface, that is, the material will inevitably pass through the core heating area between the first surface and the second surface when flowing in the material channel, so that the degree of graphitization of the material in the graphitization furnace can be kept consistent, thereby improving the consistency of the product.

[0058] Figure 1 shows a front view of a graphitization furnace 100. As shown in Figure 1, the main body of the graphitization furnace 100 is arranged vertically and mainly includes a furnace body 1 and various functional units disposed in the furnace body 1. Specifically, as shown in Figure 1, the graphitization furnace can include a loading unit, a DC power supply unit, and a cooling and discharging unit.

[0059] The loading unit primarily comprises a silo 2 and a feed pipe 3. The silo 2 is positioned above the furnace body 1 and connected to the feed port on the furnace body via the feed pipe 3. Optionally, a material shut-off valve 4 may be provided at the junction of the silo 2 and the feed pipe 3 to control the flow of material within the material channel 12.

[0060] Optionally, the material entering the graphitization furnace 100 is a graphitizable carbonaceous material, such as petroleum coke, coal coke, and asphalt. After entering the graphitization furnace, the material undergoes four stages of preheating, calcination, graphitization, and cooling to complete the graphitization process and obtain a negative electrode material product, and volatile tail gas escapes during the process.

[0061] Optionally, the number of the silos 2 can be 2, 4 or more, and they are evenly distributed above the furnace body 1.

[0062] The DC power supply unit may include a positive electrode 5, a negative electrode 6, and a DC transformer 7. As shown in Figure 1, the positive electrode 5 may extend into the furnace through an opening above the furnace body 1 and be suspended in the material passage 12. The negative electrode 6 may be positioned in the lower middle portion of the furnace body 1. Optionally, there may be at least one pair of negative electrodes 6, each pair evenly spaced 180 degrees apart. Optionally, the negative electrodes 6 may be distributed radially along the material passage 12 at the same height within the furnace body 1.

[0063] The DC transformer 7 supplies power to the furnace body 1, with a controllable power supply between 600 and 1200 kW. The positive and negative electrodes 5 and 6 apply voltage to the material passing between them. DC current flows from the positive electrode of the DC transformer 7 through the material, where it releases Joule heat due to its own resistance, raising the furnace core temperature above 3000°C. This creates a stable temperature field between the positive and negative electrodes 5 and 6. The current flowing through the material then returns from the negative electrode 6 to the negative electrode of the DC transformer 7, completing a current loop.

[0064] Optionally, the DC power supply unit may further include a fixed brake 8, a conductive member 9, a cable 10, and a copper busbar 11. The positive electrode 5 is held securely in place directly above the furnace body 1 by the fixed brake. The conductive member 9 is secured below the fixed brake 8 and conducts current to the positive electrode 5. The cable 10 connects to the copper busbar 11, which in turn connects to the positive and negative terminals of the DC transformer 7.

[0065] Alternatively, the positive electrode 5 and the negative electrode 6 may be graphite electrodes.

[0066] The cooling and discharging unit is mainly used to cool the graphitized material. Specifically, as shown in Figure 1, the cooling and discharging unit can include a low-temperature cooling section 13, which can be a water-cooling jacket. The low-temperature cooling section 13 can also be provided with a water inlet 14 and a water outlet 15. The cooling medium can be circulating water.

[0067] Optionally, the graphitization furnace 100 may further include a furnace heating unit (not shown). For example, a furnace cover and a furnace lining. The furnace cover can be placed on the upper portion of the furnace body 1 to provide insulation, while the furnace lining surrounds the inner wall of the furnace body 1 to provide insulation against the high temperature of the furnace core.

[0068] FIG2 shows a cross-sectional view of a graphitization furnace 200 provided in an embodiment of the present application. As shown in FIG2 , the graphitization furnace 200 may include a furnace body 210, a first electrode 220, and a second electrode 230. The furnace body 210 is provided with a material channel 211. The first electrode 220 extends along a first direction X, and at least a portion of the first electrode 220 is disposed within the material channel 211. The first direction is the direction in which the material channel 211 extends. The second electrode 230 is spaced apart from the first electrode 220 in a second direction Y, which is the radial direction of the material channel. The first electrode 220 and the second electrode 230 have opposite polarities. The first surface 221 of the first electrode 220 and the second surface 231 of the second electrode 230 are disposed opposite each other.

[0069] First, the following points need to be explained:

[0070] First, the polarities of the first electrode 220 and the second electrode 230 are opposite, which can be understood as forming an electric field between the first electrode 220 and the second electrode 230. Second, the first electrode 220 and the second electrode 230 are spaced apart in the second direction, which means that there is a gap between the first electrode 220 and the second electrode 230, which can form a graphitization region for heating the material, which can also be called a heating region. Third, the relative arrangement of the first surface 221 of the first electrode 220 and the second surface 231 of the second electrode 230 can mean that the projections of the first surface 221 and the second surface 231 in a certain direction at least partially overlap. Optionally, the first surface 221 and the second surface 231 can be both planes or both curved surfaces, or one can be plane and the other curved.

[0071] Alternatively, in one embodiment, the first electrode 220 may be a positive electrode, and the second electrode 230 may be a negative electrode. Alternatively, in another embodiment, the first electrode 220 may be a negative electrode, and the second electrode 230 may be a positive electrode. In other words, the polarities of the first electrode 220 and the second electrode 230 in the embodiment of the present application may be reversed.

[0072] Alternatively, if the graphitization furnace 200 is arranged vertically, that is, the material channel 211 extends in a vertical direction, the first electrode 220 is arranged vertically and the second electrode 230 is arranged horizontally. If the graphitization furnace 200 is arranged horizontally, that is, the material channel 211 extends in a horizontal direction, the first electrode 220 is arranged horizontally and the second electrode 230 is arranged vertically. For ease of understanding, the terms "upper" and "lower" in the following embodiments are used as an example to describe the graphitization furnace 200 as a vertical graphitization furnace.

[0073] In this embodiment, the first electrode 220 and the second electrode 230 are arranged at intervals along the radial direction of the material channel, and the first surface 221 of the first electrode 220 and the second surface 231 of the second electrode 230 are arranged opposite to each other, so that the core heating area is distributed between the first surface 221 and the second surface 231. Moreover, since a part of the material channel 211 is formed between the first surface 221 and the second surface 231, that is, the material will inevitably pass through the core heating area between the first surface 221 and the second surface 231 when flowing in the material channel 211, thereby making it possible to keep the graphitization degree of the material consistent in the graphitization furnace, thereby improving the consistency of the product.

[0074] Optionally, the first surface 221 and the second surface 231 are parallel to each other. For example, the first surface 221 and the second surface 231 may both be planes, and the distance between any point on the first surface 221 and the second surface 231 is equal. For another example, the first surface 221 and the second surface 231 may both be arcuate surfaces, and the circular surface on which the first surface 221 and the circular surface on which the second surface 231 are located are coaxial.

[0075] Optionally, in one implementation, the first surface 221 and the second surface 231 are both parallel to the first direction X.

[0076] In this embodiment, the first surface 221 and the second surface 231 are both parallel to the first direction X, and the first surface 221 and the second surface 231 are arranged to be parallel to each other, so that the electric field formed between the first surface 221 and the second surface 231 is evenly distributed, so that the heating degree of the material at each location between the first surface 221 and the second surface 231 is consistent, thereby improving the consistency of the product; in addition, since the electric field formed between the first surface 221 and the second surface 231 is evenly distributed, it can reduce the coking of the material at each location between the first surface 221 and the second surface 231 due to inconsistent temperature, thereby improving the fluidity of the material in the furnace.

[0077] Optionally, in other implementations, the first surface 221 and / or the second surface 231 may not be parallel to the first direction X. For example, the first electrode 220 is a frustum-shaped electrode, i.e., the cross-sectional area of ​​the first electrode 220 gradually increases from the upper surface 2201 of the first electrode 220 to the lower surface 2202 of the second electrode 230. In this embodiment, the first surface 221 of the first electrode 220 is a side surface of the first electrode 220, which may also be referred to as the outer surface of the first electrode 220. This outer surface is not parallel to the first direction X, while the second surface 231 of the second electrode 230 is parallel to the first direction X. For another example, the first electrode 220 does not extend along the first direction X, but rather extends along a direction having a certain angle with the first direction X, so that the first surface 221 of the first electrode 220 is not parallel to the first direction X, while the second surface 231 of the second electrode 230 is parallel to the first direction X. For another example, the first surface 221 of the first electrode 220 is not parallel to the first direction X, and the second surface 231 of the second electrode 230 is not parallel to the first direction X, but the first surface 221 and the second surface 231 are parallel to each other.

[0078] Optionally, in the embodiment of the present application, the second electrode 230 includes at least one pair of electrode columns 232 arranged around the first electrode 220 , and at least a portion of each electrode column in the at least one pair of electrode columns is inserted into the furnace body 210 along the second direction Y.

[0079] For example, as shown in FIG3 , the second electrode 230 includes two pairs of electrode columns arranged around the first electrode 220, wherein the first pair of electrode columns includes electrode column 2301a and electrode column 2301b, and the second pair of electrode columns includes electrode column 2302a and electrode column 2302b. The two pairs of electrode columns are arranged around the first electrode 220, and each electrode column can be inserted into the furnace body 210 along the second direction Y, so that the second surface 231 of the second electrode 230 and the first surface 221 of the first electrode 220 can be arranged opposite each other.

[0080] Optionally, the number of pairs of electrode columns included in the second electrode 230 may be 1 pair, 2 pairs, 3 pairs, 4 pairs, or any number of pairs of electrode columns.

[0081] In this embodiment, the second electrode 230 includes electrode columns arranged in pairs, which can increase the heating area of ​​the material so that the material is heated evenly at all locations, thereby improving the consistency of the product.

[0082] In other embodiments, the second electrode 230 may include an odd number of electrode columns, which is not limited in the embodiment of the present application.

[0083] Optionally, in the embodiment of the present application, the two electrode columns in each pair of the at least one pair of electrode columns 232 are symmetrically arranged relative to the central axis 222 of the first electrode 220 .

[0084] For example, as shown in Figure 3, the electrode columns 2301a and 2301b in the first pair of electrode columns are symmetrically arranged relative to the central axis 222 of the first electrode 220, and the electrode columns 2302a and 2302b in the second pair of electrode columns are symmetrically arranged relative to the central axis 222 of the first electrode 220.

[0085] It should be noted that the "symmetrical arrangement" herein may include the graphitized regions formed between the two electrode columns in each pair of electrode columns and the first electrode being symmetrical, or the electrode columns themselves may be asymmetrical, i.e., the two electrode columns in each pair of electrode columns may have different shapes and structures. For example, electrode column 2301a may be a square column, and electrode column 2301b may be a trapezoidal column. The second surface of electrode column 2301a, which is disposed opposite the first surface 221 of the first electrode 220, and the second surface of electrode column 2301b may be identical in shape and size, and electrode column 2301a and electrode column 2301b may be located at the same height of the material channel. This allows the graphitized regions formed between electrode column 2301a and the first electrode 220 to be completely symmetrical with the graphitized regions formed between electrode column 2301b and the first electrode 220.

[0086] In this embodiment, the two electrode columns in each pair of electrode columns are symmetrically arranged relative to the central axis 222 of the first electrode 220, so that the two heating areas formed between the two electrode columns in each pair of electrode columns and the first electrode are symmetrical relative to the central axis 222 of the first electrode 220. This is beneficial for making the electric field distribution of the two symmetrical heating areas uniform when controlling the electrode columns in pairs, thereby improving the heating uniformity of the material when passing through the two symmetrical heating areas, and improving the consistency of the product.

[0087] Optionally, in one embodiment of the present application, at least one pair of electrode columns 232 includes multiple pairs of electrode columns, the two electrode columns in each pair of electrode columns have the same size in the first direction X, and the third surface 233 of each electrode column is flush, and the third surface 233 is the surface of each electrode column closest to the inlet 212 of the material channel 211 in the first direction X.

[0088] For example, as shown in FIG7 , the inlet 212 of the material channel 211 is located above the graphitization furnace, and each electrode column includes an upper surface 236 (corresponding to the third surface 233 in FIG3 ) and a lower surface 235 that are oppositely disposed along a first direction X. Optionally, as shown in FIG3 , the electrode columns 2301a and 2301b included in the first pair of electrode columns and the electrode columns 2302a and 2302b included in the second pair of electrode columns have the same dimension H in the first direction X, and the third surface 2331 of the electrode column 2301a, the third surface 2332 of the electrode column 2301b, the third surface 2333 of the electrode column 2302a, and the third surface 2334 of the electrode column 2302b are flush. In other words, the upper surfaces of the electrode columns 2301a, 2301b, 2302a, and 2302b are flush, and the lower surfaces are also flush. That is, the electrode column 2301a, the electrode column 2301b, the electrode column 2302a and the electrode column 2302b are located at the same height of the material channel 211.

[0089] In this embodiment, the second electrode 230 includes multiple pairs of electrode columns, and the size H of each electrode column in the multiple pairs of electrode columns in the first direction X is the same and the third surface 233 of each electrode column is flush, which is conducive to graphitizing the material in the heating area at the same height, reducing the inconsistency of the heating degree of the material during the flow process, thereby improving the consistency of the product.

[0090] Optionally, in another embodiment of the present application, the at least one pair of electrode columns 232 includes multiple pairs of electrode columns, each electrode column in the multiple pairs of electrode columns has the same size in the first direction X, and the third surface 233 of each electrode column in at least two electrode columns in the multiple pairs of electrode columns is not flush, and the third surface 233 is the surface of each electrode column closest to the entrance of the material channel in the first direction.

[0091] For example, as shown in FIG7 , the inlet 212 of the material channel 211 is located above the graphitization furnace, and each electrode column includes an upper surface 236 (corresponding to the third surface 233 in FIG4 ) and a lower surface 235 that are oppositely arranged along the first direction X. Optionally, as shown in FIG4 , the electrode columns 2301a and 2301b included in the first pair of electrode columns and the electrode columns 2302a and 2302b included in the second pair of electrode columns have the same dimension H in the first direction X, the upper surface 2331 of the electrode column 2301a is flush with the upper surface 2332 of the electrode column 2301b, and the third surface 2333 of the electrode column 2302a is flush with the third surface 2334 of the electrode column 2302b, but the third surfaces of the first pair of electrode columns and the second pair of electrode columns are not flush. In other words, the upper surfaces of electrode columns 2301a, 2301b, 2302a, and 2302b are not flush, and the lower surfaces are not flush either.

[0092] Alternatively, in other embodiments, the third surfaces of two electrode columns in the same pair of electrode columns may also not be flush. For example, in FIG4 , the upper surface 2331 of electrode column 2301a, the upper surface 2332 of electrode column 2301b, the upper surface 2333 of electrode column 2302a, and the upper surface 2334 of electrode column 2302b are not flush.

[0093] Alternatively, the sizes of the multiple electrode columns 232 included in the second electrode 230 in the first direction X may also be different. In this case, the third surfaces 233 of the multiple electrode columns 232 may all be flush, while the surfaces opposite to the third surfaces 233 in the first direction X may not be flush; or, the third surfaces 233 of the multiple electrode columns 232 may not be flush, while the surfaces opposite to the third surfaces 233 in the first direction X are flush; or, the third surfaces 233 of the multiple electrode columns 232 may not be flush, and the surfaces opposite to the third surfaces 233 in the first direction X are flush.

[0094] In this embodiment, the second electrode 230 includes multiple pairs of electrode columns, and the size H of each electrode column in the multiple pairs of electrode columns in the first direction X is the same and the third surface 233 of each electrode column is not flush, so that graphitized regions of the material can be formed at different heights of the material channel 211, and the graphitized regions are dispersed at different heights of the first electrode 220 for heating, which can reduce damage to the first electrode 220, thereby improving the service life of the graphitization furnace 200.

[0095] Optionally, in the embodiment of the present application, the angle Φ between any two adjacent electrode columns in the multiple pairs of electrode columns projected on the first plane 2335 is equal, and the first plane 2335 is perpendicular to the first direction X. In other words, the multiple pairs of electrode columns can be evenly distributed along the circumferential direction Z of the material channel 211.

[0096] FIG5 shows a top view of the graphitization furnace 200 according to an embodiment of the present application. As shown in FIG5 , the second electrode 230 includes two pairs of electrode columns, and the angle between any two adjacent electrode columns is Φ, where Φ = 90°. In other words, the angle between electrode column 2301a and electrode column 2302a is 90°, the angle between electrode column 2301a and electrode column 2302b is 90°, the angle between electrode column 2301b and electrode column 2302a is 90°, and the angle between electrode column 2301b and electrode column 2302b is also 90°.

[0097] For another example, if the second electrode 230 includes three pairs of electrode columns, that is, six electrode columns, then the angle Φ between any two adjacent electrode columns is 60°.

[0098] In other embodiments, the angles between any two adjacent electrode columns may also be unequal, which is not limited in the embodiment of the present application.

[0099] In this embodiment, the angle Φ between any two adjacent electrode columns among the multiple pairs of electrode columns projected on the first plane 2335 is equal, that is, the multiple pairs of electrode columns are evenly distributed along the circumferential direction Z of the material channel 211, which can make the electric field in the graphitization furnace 200 evenly distributed along the circumferential direction Z of the material channel 211, thereby improving the heating uniformity of the material during the flow process and improving the consistency of the product.

[0100] Optionally, in the embodiment of the present application, the second electrode 230 may include a conductive ring 234 , which is disposed around the first electrode 220 , and an inner surface of the conductive ring 234 is the second surface 231 of the second electrode 230 .

[0101] In one implementation, the second electrode 230 only includes a conductive ring 234 . The conductive ring 234 may be disposed around the first electrode 220 such that an inner surface of the conductive ring 234 is disposed opposite to an outer surface of the first electrode 220 .

[0102] In another implementation, the second electrode 230 includes not only a conductive ring 234 but also a plurality of electrode pillars 232, with the conductive ring 234 connecting the plurality of electrode pillars 232. For example, for the plurality of electrode pillars 232 shown in FIG3 , the second electrode 230 may include one conductive ring 234, which may connect all of the plurality of electrode pillars 232. For another example, for the plurality of electrode pillars 232 shown in FIG4 , the second electrode 230 may include multiple conductive rings 234, each of which may connect electrode pillars 232 at the same height.

[0103] For the second electrode 230 having only an electrode column but no conductive ring, the end surface of the electrode column facing the outer surface of the first electrode 220 is the second surface 231 of the second electrode 230 .

[0104] In this embodiment, the second electrode 230 includes a conductive ring 234, which is arranged around the first electrode 220 so that the inner surface of the conductive ring 234 is the second surface 231 of the second electrode 230. This electrode arrangement is simple and easy to implement; in addition, since the conductive ring 234 is arranged around the first electrode 220, the material channel 211 can have a heating area in the entire circumference Z, thereby improving the heating uniformity of the material during the flow process and improving the consistency of the product.

[0105] Figure 6 shows a top view of another graphitization furnace according to an embodiment of the present application. As shown in Figure 6, the second electrode 230 includes a plurality of electrode columns 232 and a conductive ring 234. The plurality of electrode columns 232 may include electrode columns 2301a, electrode columns 2301b, electrode columns 2302a, and electrode columns 2302b. The conductive ring 234 connects the plurality of electrode columns 232 and surrounds the first electrode 220, thereby forming a graphitization region 240 between the inner surface of the conductive ring 234 and the outer surface of the first electrode 220.

[0106] Optionally, in the embodiment of the present application, the conductive ring 234 is coaxially arranged with the first electrode 220 .

[0107] In this embodiment, the conductive ring is coaxially arranged with the first electrode, which is beneficial to uniform distribution of the electric field in the radial direction of the material channel and uniform distribution of the heating area of ​​the material, thereby improving the consistency of the product.

[0108] Optionally, in the embodiment of the present application, the shape of the cross section of the inner surface of the conductive ring 234 perpendicular to the first direction X is the same as the shape of the cross section of the outer surface of the first electrode perpendicular to the first direction X.

[0109] For example, if the cross-section of the inner surface of the conductive ring 234 perpendicular to the first direction X is circular, the cross-section of the outer surface of the first electrode 220 perpendicular to the first direction X is also circular. For another example, if the cross-section of the inner surface of the conductive ring 234 perpendicular to the first direction X is square, the cross-section of the outer surface of the first electrode 220 perpendicular to the first direction X is also square.

[0110] In this embodiment, the shape of the cross section of the inner surface of the conductive ring 234 perpendicular to the first direction X is set to be the same as the shape of the cross section of the outer surface of the first electrode 220 perpendicular to the first direction X, so that the inner surface of the conductive ring 234 and the outer surface of the first electrode 220 are parallel to each other, so that a uniform electric field can be formed between the inner surface of the conductive ring 234 and the outer surface of the first electrode 220, so that the degree of graphitization of the material in the graphitization furnace remains consistent, thereby improving the consistency of the product.

[0111] Optionally, in an embodiment of the present application, the distance between the fourth surface 223 of the first electrode 220 and the inlet 212 of the material channel 211 is less than or equal to the distance between the fifth surface 235 of the second electrode 230 and the inlet 212 of the material channel 211, the fourth surface 223 is the surface of the first electrode 220 farthest from the inlet 212 of the material channel 211 in the first direction X, and the fifth surface 235 is the surface of the second electrode 230 farthest from the inlet 212 of the material channel 211 in the first direction X.

[0112] It should be understood that the distance between the fourth surface 223 of the first electrode 220 and the inlet 212 of the material channel 211 can be the maximum distance between the fourth surface 223 and the inlet 212. Similarly, the distance between the fifth surface 235 of the second electrode 230 and the inlet 212 of the material channel 211 can be the maximum distance between the fifth surface 235 and the inlet 212.

[0113] Figure 7 shows a cross-sectional view of a graphitization furnace 200 according to an embodiment of the present application. As shown in Figure 7 , the distance between the fourth surface 223 of the first electrode 220 and the inlet 212 of the material channel 211 is less than or equal to the distance between the fifth surface 235 of the second electrode 230 and the inlet 212 of the material channel 211. In other words, the lower surface of the first electrode 220 is not lower than the lower surface of the second electrode 230.

[0114] It should be explained that if the second electrode 230 includes multiple pairs of electrode columns and / or multiple conductive rings, and the multiple pairs of electrode columns and / or multiple conductive rings are located at different heights of the material channel 211, then the fifth surface 235 of the second electrode 230 refers to the lower surface of the conductive column and / or conductive ring at the height farthest from the inlet 212 of the material channel 211.

[0115] In this embodiment, the distance between the fourth surface 223 of the first electrode 220 and the inlet 212 of the material channel 211 is set to be less than or equal to the distance between the fifth surface 235 of the second electrode 230 and the inlet 212 of the material channel 211. This is beneficial to avoiding the problem of part of the first electrode 220 being mixed into the material due to the melting of the first electrode 220, thereby improving the purity of the graphitized material, and at the same time reducing the wear of the graphitization furnace 200 caused by the melted first electrode, thereby increasing the life of the graphitization furnace 200.

[0116] Optionally, in the embodiment of the present application, the graphitization furnace 200 further includes: a furnace lining 250, which is arranged around the inner wall of the furnace body 210; wherein the furnace lining 250 completely covers the surface of the second electrode 230 in the furnace body 210 that is perpendicular to the first direction X.

[0117] For example, as shown in FIG. 7 , the furnace lining 250 is disposed around the inner wall of the furnace body 210 , and the furnace lining 250 completely covers the upper surface 236 and the lower surface 235 of the second electrode 230 in the furnace body 210 .

[0118] In this embodiment, a furnace lining 250 is arranged around the inner wall of the furnace body 210, which can provide thermal insulation for the high temperature in the furnace body 210; in addition, the furnace lining 250 completely covers the surface of the second electrode 230 in the furnace body 210 that is perpendicular to the first direction X, which can limit the material channel 211 so that the material can only pass through the heating area between the first surface 221 and the second surface 231, thereby improving the consistency of the product; at the same time, it can also reduce the possibility of material accumulation on the surface of the second electrode 230 in the furnace body 210 that is perpendicular to the first direction X, thereby improving the fluidity of the material.

[0119] In other embodiments, an insulating layer (not shown) may be provided on the upper surface 236 and the lower surface 235 of the second electrode 230 in the furnace body 210 to reduce the possibility of an electric field being formed between the outer surface of the first electrode 220 and the upper surface 236 and the lower surface 235 of the second electrode.

[0120] Alternatively, the furnace lining 250 may also be made of insulating material.

[0121] Optionally, in an embodiment of the present application, the furnace lining 250 may include: an insulation layer 252 and a heat-resistant layer 251 , wherein the heat-resistant layer 251 is arranged around the insulation layer 252 , and the thermal conductivity of the insulation layer 252 is lower than the thermal conductivity of the heat-resistant layer 251 .

[0122] For example, as shown in Figure 7, the furnace lining 250 may include a heat-resistant layer 251 and a heat-insulating layer 252, with the heat-resistant layer 251 disposed around the heat-insulating layer 252. Optionally, the heat-insulating layer 252 may be made of a material with large particles, a particle size of 10-30 mm, and a thermal conductivity of 0.2-0.5 W / mk, which has good heat-insulating properties. This can improve heat-insulating properties, reduce heat loss, and lower energy consumption. The heat-resistant layer 251 may be made of a material with a heat-resistant temperature range of 1450-3000°C, a thermal conductivity of 0.5-1.2 W / mk, and good insulation properties, thereby extending the service life of the graphitization furnace.

[0123] Optionally, the heat-resistant layer 251 may be composed of steel plate, ceramic fiber product, lightweight refractory brick / casting material, and heavy refractory brick / casting material in order from the outside to the inside, while the insulation layer 252 may be composed of high-temperature resistant lightweight carbon insulation material.

[0124] In this embodiment, a multi-layer thermal insulation furnace lining is provided to increase the service life of the graphitization furnace 200. In addition, the thermal conductivity of the thermal insulation layer 252 is set to be lower than the thermal conductivity of the temperature-resistant layer 251, which can improve the thermal insulation effect while reducing the cost of the graphitization furnace.

[0125] Optionally, as shown in FIG7 , the furnace inner lining 250 may further include a working lining 253 surrounded by a thermal insulation layer 252 , and the working lining 253 may be made of carbonaceous refractory bricks.

[0126] Optionally, in the embodiment of the present application, the first electrode 220 is a cylindrical electrode.

[0127] In this embodiment, the second electrode 230 may be a ring-shaped electrode. Alternatively, the second electrode 230 may be a plurality of electrode pillars with arc-shaped end surfaces, and the plurality of electrode pillars 232 may be arranged to form a ring coaxial with the first electrode 220 .

[0128] In this embodiment, the first electrode 220 is a cylindrical electrode, which can reduce the need for improvement of the existing electrode structure, thereby reducing the cost of the graphitization furnace 200 .

[0129] Optionally, the diameter of the first electrode 220 is 500-700 mm. Optionally, the current density of the first electrode 220 can be 18-26 A / cm 2 , the current load may be 50000-75000A, the resistivity may be less than 6μΩm; and / or, the current density of the second electrode 230 may be 10-20A / cm 2 , the current load can be 20000-30000A, and the resistivity can be less than 8μΩm.

[0130] Optionally, the first electrode 220 is a graphite electrode; and / or the second electrode 230 is a graphite electrode.

[0131] FIG8 shows a schematic block diagram of a control method for a graphitization furnace according to an embodiment of the present application. The graphitization furnace may include a furnace body, a first electrode, and a second electrode. The furnace body is provided with a material channel. The first electrode extends along a first direction, and at least a portion of the first electrode is disposed within the material channel. The first direction is the direction in which the material channel extends. The second electrode is spaced apart from the first electrode in a second direction, which is the radial direction of the material channel. As shown in FIG8 , the control method 300 may include some or all of the following contents.

[0132] 310. During the graphitization process, controlling the first electrode and the second electrode channel to form an electric field between a first surface of the first electrode and a second surface of the second electrode that are oppositely disposed, wherein a portion of the material channel is formed between the first surface and the second surface.

[0133] It should be noted that the structure of the graphitization furnace involved in the method embodiment can refer to the graphitization furnace 200 shown in Figures 2 to 7 above, and for the sake of brevity, no detailed description is given here.

[0134] Optionally, in one embodiment of the present application, the second electrode includes multiple pairs of electrode columns arranged around the first electrode, and the two electrode columns in each pair of the multiple pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode. During the graphitization process, controlling the second electrode to be energized may include: controlling the multiple pairs of electrode columns to be energized at the same time during the graphitization process.

[0135] Optionally, in another embodiment of the present application, the second electrode includes multiple pairs of electrode columns arranged around the first electrode, and the two electrode columns in each pair of the multiple pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode. During the graphitization process, controlling the second electrode to be energized may include: during the graphitization process, sequentially controlling each pair of electrode columns in the multiple pairs of electrode columns to be energized.

[0136] For example, for the graphitization furnace 200 shown in Figures 5 and 6, the first pair of electrode columns, i.e., electrode columns 2301a and electrode columns 2301b, can be energized first, and after a period of time, the second pair of electrode columns, i.e., electrode columns 2302a and electrode columns 2302b, can be energized. Switching between the first and second pairs of electrode columns can be performed periodically.

[0137] Optionally, as shown in FIG9 , an embodiment of the present application further provides a battery preparation device 400 , which may include the graphitization furnace 200 described in the various embodiments above. The graphitization furnace 200 may be used to prepare a negative electrode material for a battery.

[0138] Optionally, the battery in the embodiment of the present application 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 the embodiment of the present application is not limited to this.

[0139] The batteries described in the embodiments of the present application are suitable for various devices that use batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0140] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A graphitization furnace, characterized in that: include: The furnace body is provided with a material channel; a first electrode extending along a first direction, wherein at least a portion of the first electrode is disposed in the material channel, and the first direction is an extending direction of the material channel; a second electrode, spaced apart from the first electrode in a second direction, the second direction being a radial direction of the material channel, the first electrode and the second electrode having opposite polarities; The first surface of the first electrode and the second surface of the second electrode are arranged opposite to each other, and a part of the material channel is formed between the first surface and the second surface.

2. The graphitization furnace according to claim 1, characterized in that: The first surface and the second surface are both parallel to the first direction, and the first surface and the second surface are parallel to each other.

3. The graphitization furnace according to claim 1 or 2, characterized in that: The second electrode includes at least one pair of electrode columns disposed around the first electrode, and at least a portion of each of the at least one pair of electrode columns is inserted into the furnace body along the second direction.

4. The graphitization furnace according to claim 3, characterized in that: The two electrode columns in each pair of the at least one pair of electrode columns are symmetrically arranged relative to the central axis of the first electrode.

5. The graphitization furnace according to claim 3 or 4, characterized in that: The at least one pair of electrode columns comprises a plurality of pairs of electrode columns, each electrode column in the plurality of pairs of electrode columns has the same size in the first direction, and a third surface of each electrode column is flush, and the third surface is a surface of each electrode column that is closest to the entrance of the material channel in the first direction.

6. The graphitization furnace according to claim 3 or 4, characterized in that: The at least one pair of electrode columns comprises a plurality of pairs of electrode columns, each electrode column in the plurality of pairs of electrode columns has the same size in the first direction, and a third surface of each electrode column in at least two electrode columns in the plurality of pairs of electrode columns is not flush, and the third surface is a surface of each electrode column that is closest to the entrance of the material channel in the first direction.

7. The graphitization furnace according to claim 5 or 6, characterized in that: The angles between any two adjacent electrode columns in the plurality of pairs of electrode columns projected on the first plane are equal, and the first plane is perpendicular to the first direction.

8. The graphitization furnace according to any one of claims 1 to 7, characterized in that: The second electrode comprises: A conductive ring is arranged around the first electrode, and the inner surface of the conductive ring is the second surface.

9. The graphitization furnace according to claim 8, characterized in that: The conductive ring is coaxially arranged with the first electrode.

10. The graphitization furnace according to claim 8 or 9, characterized in that: A shape of a cross section of an inner surface of the conductive ring perpendicular to the first direction is the same as a shape of a cross section of an outer surface of the first electrode perpendicular to the first direction.

11. The graphitization furnace according to any one of claims 1 to 10, characterized in that: The distance between the fourth surface of the first electrode and the entrance of the material channel is less than or equal to the distance between the fifth surface of the second electrode and the entrance of the material channel, the fourth surface is the surface of the first electrode farthest from the entrance of the material channel in the first direction, and the fifth surface is the surface of the second electrode farthest from the entrance of the material channel in the first direction.

12. The graphitization furnace according to any one of claims 1 to 11, characterized in that: The first electrode is a cylindrical electrode.

13. The graphitization furnace according to claim 12, characterized in that: The diameter of the first electrode is 500 mm-700 mm.

14. The graphitization furnace according to any one of claims 1 to 13, characterized in that: The graphitization furnace comprises: A furnace body lining, arranged around the inner wall of the furnace body; The furnace body lining completely covers the surface of the second electrode in the furnace body that is perpendicular to the first direction.

15. The graphitization furnace according to claim 14, characterized in that: The furnace lining comprises: A heat-insulating layer and a heat-resistant layer, wherein the heat-resistant layer is arranged around the heat-insulating layer, and the thermal conductivity of the heat-insulating layer is lower than the thermal conductivity of the heat-resistant layer.

16. The graphitization furnace according to any one of claims 1 to 15, characterized in that: The first electrode is a graphite electrode, and / or the second electrode is a graphite electrode.

17. The graphitization furnace according to any one of claims 1 to 16, characterized in that: The extending direction of the material channel is vertical.

18. A method for controlling a graphitization furnace, characterized in that: The graphitization furnace comprises a furnace body, a first electrode and a second electrode, the furnace body is provided with a material channel, the first electrode extends along a first direction and at least a portion of the first electrode is arranged in the material channel, the first direction is the extension direction of the material channel, the second electrode is spaced apart from the first electrode in a second direction, the second direction is the radial direction of the material channel, and the control method comprises: During the graphitization process, the first electrode and the second electrode are controlled to be energized to form an electric field between a first surface of the first electrode and a second surface of the second electrode which are arranged opposite to each other, and a part of the material channel is formed between the first surface and the second surface.

19. The control method according to claim 18, characterized in that: The second electrode comprises a plurality of pairs of electrode columns arranged around the first electrode, wherein two electrode columns in each pair of the plurality of pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode, and during the graphitization process, controlling the second electrode to be energized comprises: During the graphitization process, the multiple pairs of electrode columns are controlled to be energized simultaneously.

20. The control method according to claim 19, characterized in that: The second electrode comprises a plurality of pairs of electrode columns arranged around the first electrode, wherein two electrode columns in each pair of the plurality of pairs of electrode columns are symmetrically arranged relative to the central axis of the first electrode, and during the graphitization process, controlling the second electrode to be energized comprises: During the graphitization process, each pair of electrode columns in the plurality of pairs of electrode columns is controlled to be energized in sequence.

21. A battery manufacturing device, characterized in that: It comprises a graphitization furnace as claimed in any one of claims 1 to 17, wherein the graphitization furnace is used to prepare the negative electrode material of the battery.

Images