Graphitization furnace and battery production system

Abstract

The embodiment of the utility model provides a graphitization furnace and a battery production system. The consistency of products obtained by the graphitization furnace can be improved. Specifically, the graphitization furnace comprises: a furnace body, in which a material channel is arranged; the plurality of electrodes form a plurality of groups of opposite surfaces, a gap is formed between each group of opposite surfaces in the plurality of groups of opposite surfaces, and the plurality of gaps corresponding to the plurality of groups of opposite surfaces form different areas of the material channel; each of the plurality of sets of opposing faces includes a first surface of a first electrode and a second surface of a second electrode, the first electrode and the second electrode having opposite polarities.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202310247665.1, filed on March 15, 2023, entitled “Graphitization Furnace and Battery Production System,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present application relate to the technical field of mechanical engineering, and more specifically, to a graphitization furnace and battery production system. BACKGROUND

[0004] With the rapid development of new energy technology, power batteries are widely used in many fields due to their high energy density and recyclable performance, and have become an essential part of human life. Currently, among the negative materials of power batteries, carbon materials are widely used, among which, graphitized carbon materials (also simply referred to as graphite materials) have been widely commercialized due to their long service life, stable structure, low cost, and other advantages. In addition, the excellent properties of graphite materials also enable their wide application in many fields.

[0005] A graphitization furnace is a device that can generate graphite materials, and the performance of the products obtained by the graphitization furnace is very important for the production and manufacturing of graphite and batteries. Therefore, how to improve the performance of the products obtained by the graphitization furnace is an urgent technical problem to be solved. SUMMARY

[0006] Embodiments of the present application provide a graphitization furnace and battery production system, which can improve the consistency of the products obtained by the graphitization furnace.

[0007] In a first aspect, a graphitization furnace is provided, comprising: a furnace body, a material passage is arranged in the furnace body; a plurality of electrodes, the plurality of electrodes form a plurality of groups of opposite surfaces, each group of opposite surfaces in the plurality of groups of opposite surfaces has a gap, a plurality of gaps corresponding to the plurality of groups of opposite surfaces form different regions of the material passage, each group of opposite surfaces in the plurality of groups of opposite surfaces includes a first surface of a first electrode and a second surface of a second electrode, the first electrode and the second electrode are opposite in polarity.

[0008] In the embodiment of the present application, by arranging a plurality of electrodes in the graphitization furnace, the plurality of electrodes form a plurality of sets of opposite surfaces, a gap between each set of opposite surfaces forms an electric field, and a plurality of gaps corresponding to the plurality of sets of opposite surfaces form a plurality of electric fields, so that the plurality of regions of the material channel exist electric fields. When the material flows in the material channel, it will pass through the plurality of regions of the material channel and also pass through the plurality of electric fields existing in the plurality of regions. The material is graphitized by Joule heat generated by passing through the plurality of electric fields, that is, the plurality of electric fields realize heating of the material. The material passes through the plurality of electric fields for a longer time, thereby prolonging the heating time of the material, thereby providing sufficient heating time for the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained using the graphitization furnace.

[0009] In some embodiments, the first surface and the second surface are oppositely arranged along a first direction, the first direction intersects the second direction, and the second direction is the extension direction of the material channel.

[0010] In the embodiment of the present application, by oppositely arranging the first surface and the second surface along the first direction intersecting the extension direction of the material channel, the electric field direction of the electric field formed between the first surface and the second surface is at an angle with the extension direction of the material channel, so that a plurality of electric fields with the electric field direction can be formed along the extension direction of the material channel. The material passes through the plurality of electric fields for a longer time, thereby prolonging the heating time of the material, thereby providing sufficient heating time for the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained using the graphitization furnace.

[0011] In some embodiments, the first surface and the second surface of at least one set of opposite surfaces are arranged in parallel.

[0012] In the embodiment of the present application, by arranging the first surface and the second surface in parallel, the relative region between the first surface and the second surface forms a parallel and uniform electric field. When the material passes through the parallel and uniform electric field, uniform Joule heat is generated, thereby reducing the probability of uneven heating of the material, and thereby improving the consistency of the products obtained using the graphitization furnace.

[0013] In some embodiments, the first electrode includes a plurality of first surfaces, and the plurality of first surfaces of one first electrode and the second surfaces of a plurality of second electrodes form a plurality of sets of opposite surfaces.

[0014] In the embodiments of the present application, a plurality of first surfaces of a first electrode and a plurality of second surfaces of a plurality of second electrodes form a plurality of sets of opposite surfaces, a small number of electrodes are used to form a plurality of sets of opposite surfaces, and the plurality of sets of opposite surfaces form a plurality of electric fields, that is, a small number of electrodes are used to obtain a plurality of electric fields. Thus, while saving the amount of electrodes, the heating of the material is realized through the plurality of electric fields, the heating time of the material is prolonged, sufficient heating time is provided for the material, the material has sufficient time to complete graphitization, and the consistency of the products obtained by using the graphitization furnace can be improved.

[0015] In some embodiments, the first electrode includes two first surfaces connected to each other, and the two first surfaces and the second surfaces of two second electrodes adjacent in a second direction form two sets of opposite surfaces, the second direction being the extension direction of the material channel.

[0016] In the embodiments of the present application, two first surfaces of a first electrode connected to each other and two second surfaces of two adjacent second electrodes form two sets of opposite surfaces, so that one first electrode corresponds to two second electrodes, and the amount of electrodes is saved. When the two first surfaces of the first electrode are connected to each other, the distance between the two first surfaces is close, resulting in that the distance between the two electric fields formed between the two sets of opposite surfaces is close, so that the electric field can be formed in multiple regions of the material channel, the heating of the material is realized through the plurality of electric fields, the heating time of the material is prolonged, sufficient heating time is provided for the material, the material has sufficient time to complete graphitization, and the consistency of the products obtained by using the graphitization furnace can be improved.

[0017] In some embodiments, the angle between the two first surfaces of the first electrode is the same as the angle between the two second surfaces of the second electrode.

[0018] In the embodiments of the present application, by setting the angle between the two first surfaces of the first electrode to be the same as the angle between the two second surfaces of the second electrode, a parallel and uniform electric field can be formed between the opposite surfaces, the Joule heat generated by the material passing through the electric field is the same, that is, the heating temperature of the material in different regions is the same, the graphitization degree is the same, and the consistency of the products obtained by using the graphitization furnace can be improved.

[0019] In some embodiments, the angle between the two first surfaces of the first electrode is 30°-150°. Alternatively, the angle between the two first surfaces is 60°-120°.

[0020] In the embodiments of the present application, when the angle between the two first surfaces is too small, the distance between the two first surfaces is too close, which may cause the electrode thickness of the region surrounded by the two first surfaces to be small, that is, the electrode of the region is thin, and the electrode is prone to breakage and the like; and when the angle between the two first surfaces is too large, the two first surfaces can be approximately understood as being in a plane, at this time, when the two first surfaces and the two second surfaces are opposite to each other, the electric field may be located in the region with a short distance between the two first surfaces and the two second surfaces, resulting in uneven electric field distribution. Therefore, by setting the angle between the two first surfaces to be within a certain range, the angle between the direction of the electric field formed between the first surface and the second surface and the extension direction of the material channel is within a certain range, the strength of the electrode is improved, at the same time, the region of the electric field formed in the material channel can be controlled, the material is concentratedly heated, when the heating region is large, sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, and thus the consistency of the products obtained by using the graphitization furnace can be improved.

[0021] In some embodiments, the shape and size of the first surface and the second surface are the same.

[0022] In the embodiments of the present application, by setting the shape and size of the first surface and the second surface to be the same, the areas of the first surface and the second surface are equal, when the two are oppositely arranged along the first direction, compared with the case where the shape and size of the two are different, the overlapping area of the two along the first direction is larger, and the area of the first surface and the second surface is fully utilized to form a large range of electric field, saving the amount of electrode, and based on the large range of electric field formed between the two, the material is heated, the heating region is large, sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, and thus the consistency of the products obtained by using the graphitization furnace can be improved.

[0023] In some embodiments, the material channel is cylindrical, and the first surface and the second surface are part of an elliptical surface.

[0024] In the embodiments of the present application, by setting the material channel to be cylindrical and the first surface and the second surface to be part of an elliptical surface, when the material channel is cylindrical, the first surface and the second surface which are part of an elliptical surface are as close to the inner side wall of the material channel as possible, the utilization rate of the first surface and the second surface to the material channel is improved, and the probability of the first surface and the second surface blocking the flow of the material is reduced, which can improve the production efficiency of the graphitization furnace, provide a large range of electric field for the heating of the material, so that the material has sufficient time to complete graphitization, and thus the consistency of the products obtained by using the graphitization furnace can be improved.

[0025] In some embodiments, the first surface has a gap between its orthogonal projection on a plane perpendicular to a second direction and the orthogonal projection of the second surface on the plane perpendicular to the second direction, the second direction being a direction of extension of the material passage.

[0026] In the embodiments, the gap between the orthogonal projection of the first surface and the orthogonal projection of the second surface on a plane perpendicular to a second direction reduces the probability that the first surface and the second surface hinder the flow of the material, and enables the flow speed of the material in the material passage to be maintained in an optimal range, thereby improving the production efficiency of the graphitization furnace.

[0027] In some embodiments, the ratio of the area of the orthogonal projection of the first surface on a plane perpendicular to a second direction to the area of the orthogonal projection of the material passage on the plane perpendicular to the second direction is less than 1 / 2, and / or the ratio of the area of the orthogonal projection of the second surface on the plane perpendicular to the second direction to the area of the orthogonal projection of the material passage on the plane perpendicular to the second direction is less than 1 / 2, the second direction being a direction of extension of the material passage.

[0028] In the embodiments, the ratio of the area of the orthogonal projection of the first surface to the area of the orthogonal projection of the material passage on a plane perpendicular to a second direction is less than 1 / 2, and / or the ratio of the area of the orthogonal projection of the second surface to the area of the orthogonal projection of the material passage on the plane perpendicular to the second direction is less than 1 / 2, which reduces the probability that the first surface and the second surface hinder the flow of the material when the material flows smoothly in the material passage, and enables the flow speed of the material in the material passage to be maintained in an optimal range, thereby improving the production efficiency of the graphitization furnace.

[0029] In some embodiments, the orthogonal projection of the first electrode on a plane parallel to a second direction at least partially falls between the orthogonal projections of two adjacent second electrodes on the plane parallel to the second direction, the second direction being a direction of extension of the material passage.

[0030] In the embodiments of the present application, the first electrode can be fully or partially projected between the two projections of the two adjacent second electrodes in the plane parallel to the second direction, so that the first electrode and the second electrode are staggered in the extension direction of the material channel. Since the electric field can be formed between the first surface of the first electrode and the second surface of the second electrode, when the first electrode and the second electrode are staggered in the extension direction of the material channel, a plurality of electric fields between the first surface and the second surface can be formed along the extension direction of the material channel, and the area where the electric field exists in the material channel is larger. Therefore, the material needs more time to pass through the electric field, and the heating time of the material is prolonged, so that the material is provided with sufficient heating time, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0031] In some embodiments, the first electrode and the second electrode both extend in the direction away from the material channel along the radial direction of the material channel to form a connecting end for connecting with a power supply.

[0032] In the embodiments of the present application, the first electrode and the second electrode extend in the direction away from the material channel along the radial direction of the material channel to form a connecting end. When the connecting end is connected with the power supply, the first electrode and the second electrode are powered on, which improves the stability of the electric field formed between the first surface and the second surface. Therefore, the material generates Joule heat by passing through the stable electric field, and the heating temperature of the material is stable, so that the material has sufficient temperature to complete graphitization, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0033] In some embodiments, the connecting end extends out of the furnace body along the radial direction of the material channel.

[0034] In the embodiments of the present application, the connecting end extends out of the furnace body along the radial direction of the material channel, so that the first electrode and the second electrode are fixed by the furnace body, and the electrodes in the inner and outer parts of the furnace body are electrically connected by the connecting end. The stability of the position of the first electrode and the second electrode is improved, and the stability of the electric field generated in the furnace body is further improved, thereby improving the production efficiency of the graphitization furnace.

[0035] In some embodiments, the graphitization furnace further comprises a heat preservation member arranged on the side of the material channel facing the outside of the furnace body.

[0036] In the embodiments of the present application, by arranging the heat preservation member, the temperature of the heating area formed between the first electrode and the second electrode can be preserved, so that the heating area is maintained at a high temperature range, the graphitization degree of the material is uniform, and the consistency of the products obtained by using the graphitization furnace is further improved.

[0037] In some embodiments, the diameter of the particles included in the heat preservation member is 10mm-30mm.

[0038] In the embodiment of the present application, by setting the diameter of the particles included in the heat preservation member, the heat preservation effect of the heat preservation member at the particle diameter can be improved.

[0039] In some embodiments, the thermal conductivity of the heat preservation member is 0.2 W / mK-0.5 W / mK.

[0040] In the embodiment of the present application, by setting the thermal conductivity of the heat preservation member, the heat preservation member can reduce the heat loss of the graphitization furnace at the thermal conductivity, thereby improving the energy utilization rate.

[0041] In some embodiments, the graphitization furnace further comprises: a temperature-resistant member arranged on the side of the heat preservation member facing the outside of the furnace body.

[0042] In the embodiment of the present application, by arranging the temperature-resistant member, the furnace body inside can be heat preserved, thereby reducing heat loss and improving energy utilization rate.

[0043] In some embodiments, the temperature-resistant member is a cylindrical temperature-resistant member and the heat preservation member is a cylindrical heat preservation member, and the cylindrical temperature-resistant member is sleeved on the outer periphery of the cylindrical heat preservation member.

[0044] In the embodiment of the present application, by sleeving the cylindrical heat preservation member and the cylindrical heat insulation member, the energy loss between the two components is reduced, and the energy utilization rate and the heat preservation effect are improved.

[0045] In a second aspect, a battery production system is provided, which comprises the graphitization furnace of the first aspect or any one of the embodiments of the first aspect, and the graphitization furnace is used for producing negative electrode graphite material of a battery. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0047] Figure 1 is a structural schematic diagram of a graphitization furnace provided by an embodiment of the present application;

[0048] Figure 2 is a schematic perspective view of a plurality of electrodes and material channels included in a graphitization furnace provided by an embodiment of the present application;

[0049] Figure 3 is a schematic front view of a plurality of electrodes and material channels included in a graphitization furnace provided by an embodiment of the present application;

[0050] Figure 4 is a schematic side view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0051] Figure 5 is a schematic top view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0052] Figure 6 is a schematic perspective view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0053] Figure 7 is a schematic sectional view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0054] Figure 8 is a schematic side view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0055] Figure 9 is a schematic top view of a plurality of electrodes and material channels included in a graphitization furnace according to an embodiment of the present application;

[0056] Figure 10 is another schematic structural view of a graphitization furnace according to an embodiment of the present application.

[0057] In the drawings, the drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be further described in detail with reference to the accompanying drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0059] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0060] The directional terms appearing in the following description are the directions shown in the drawings and are not intended to limit the specific structure of the present application. In the description of the present application, it should be further noted that unless otherwise explicitly defined and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that there are A, A and B, and B. In addition, the character " / " in the present application generally represents that the front and rear associated objects are in an "or" relationship.

[0062] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as understood by those skilled in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and their any variants are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0063] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0064] The present application relates to a graphitization furnace, which can convert carbon atoms from a random layer structure to an ordered graphite crystal structure by heating, for realizing graphitization treatment of non-graphitic carbon. The graphitization is to improve the thermal and electrical conductivity of carbon materials, improve the thermal shock resistance and chemical stability of carbon materials, make the carbon materials have lubricity and wear resistance, improve the purity of carbon materials, reduce the hardness of carbon materials, and be more easily machined, etc.

[0065] Currently, the graphitization furnace can be mainly used for sintering and graphitization of carbon materials, graphitization of polyimide (PI) film, graphitization of heat-conducting materials, sintering of carbon fiber ropes, sintering and graphitization of carbon fiber filaments, purification of graphite, and other high-temperature processing of materials that can be graphitized in a carbon environment. In some specific applications, the graphite material processed by the graphitization furnace can be used to form the negative electrode material of a battery, for example, graphite can be used as a major negative electrode material of a lithium battery.

[0066] Generally, the vertical graphitization furnace includes a columnar electrode located at the upper part of the furnace body and a ring-shaped electrode located at the lower part of the furnace body, the columnar electrode is vertically placed at the center of the material passage, and the ring-shaped electrode is horizontally placed. An umbrella-shaped or frustum-shaped electric field is formed between the lower surface of the columnar electrode and the side surface of the ring-shaped electrode, when the material passes through the electric field, the material will generate Joule heat based on its own resistance, thereby forming an umbrella-shaped or frustum-shaped high-temperature area, after passing through the high-temperature area, the material can achieve graphitization. However, due to the uneven distribution of the electric field, the Joule heat generated by the material passing through different areas is not uniform, so the high-temperature area includes a core heating area that can completely graphitize the material and a non-core heating area with a lower temperature than the core heating area. The core heating area is actually located in the part of the area below the lower surface of the columnar electrode, and the non-core heating area is located in the part of the material passage other than the core heating area. During the flow of the material along the material passage, part of the material will pass through the core heating area, and another part of the material will pass through the non-core heating area, thereby causing the graphitization degree of the other part of the material passing through the non-core heating area to be uneven, and further causing the consistency of the products obtained by using the graphitization furnace to be poor.

[0067] In view of this, the embodiment of the present application provides a graphitization furnace, which comprises a furnace body provided with a material channel and a plurality of electrodes, the plurality of electrodes form a plurality of groups of opposite surfaces, each group of opposite surfaces has a gap therebetween, and the plurality of gaps corresponding to the plurality of groups of opposite surfaces form different regions of the material channel. Each group of opposite surfaces comprises a first surface of a first electrode and a second surface of a second electrode, and the first electrode and the second electrode are opposite in polarity. That is, the plurality of groups of opposite surfaces formed by the plurality of electrodes correspond to the plurality of gaps, and the plurality of gaps form different regions of the material channel. Since each gap in the plurality of gaps is a gap between the first surface and the second surface, an electric field is formed between the first surface of the first electrode and the second surface of the second electrode, that is, each gap in the plurality of gaps forms an electric field, so that an electric field exists in each region of the material channel. When the material flows in the material channel, it will pass through the plurality of regions of the material channel and the plurality of electric fields existing in the plurality of regions. The material is graphitized by Joule heat generated by passing through the plurality of electric fields, that is, the plurality of electric fields realize heating of the material. The time of the material passing through the plurality of electric fields is prolonged, so that the heating time of the material is prolonged, so that the material is provided with sufficient heating time, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0068] In the present application, a battery refers to a physical module comprising one or more battery cells to provide electrical energy. The battery generally comprises a box for packaging one or more battery cells. Optionally, the battery cell can comprise 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. The embodiments of the present application are not limited thereto. Among them, graphite can be used as the negative active material of the battery cell, and cooperates with the positive active material (for example, lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc.) of the battery cell to realize the movement of metal ions to form an electric current.

[0069] Figure 1 A structural schematic diagram of a graphitization furnace provided by an embodiment of the present application is shown. As shown in Figure 1 The graphitization furnace 100 comprises a furnace body 110 and a plurality of electrodes, wherein the furnace body 110 is provided with a material channel 111; the plurality of electrodes form a plurality of groups of opposite surfaces, each group of opposite surfaces has a gap therebetween, and the plurality of gaps corresponding to the plurality of groups of opposite surfaces form different regions of the material channel 111. Each group of opposite surfaces comprises a first surface 121 of a first electrode 120 and a second surface 131 of a second electrode 130, and the first electrode 120 and the second electrode 130 are opposite in polarity.

[0070] Specifically, the plurality of electrodes can include one first electrode 120 and one second electrode 130, can include one first electrode 120 and a plurality of second electrodes 130, can include a plurality of first electrodes 120 and one second electrode 130, and can include a plurality of first electrodes 120 and a plurality of second electrodes 130, and the present application does not limit this.

[0071] In some embodiments, the first electrode 120 can include one or more first surfaces 121, and similarly, the second electrode 130 can include one or more second surfaces 131, and a first surface 121 and a second surface 131 form a set of opposite surfaces. Since the polarity of the first electrode 120 and the second electrode 130 is opposite, an electric field can be formed between the set of opposite surfaces formed by the first surface 121 and the second surface 131.

[0072] It is worth noting that in the embodiments of the present application, the polarity of the first electrode 120 and the second electrode 130 is opposite, for example, the first electrode 120 is positive and the second electrode 130 is negative, or vice versa, so that an electric field can be formed between the first electrode 120 and the second electrode 130, which can be used to heat the material, thereby realizing the graphitization of the material.

[0073] Therefore, by arranging a plurality of electrodes in the graphitization furnace 100, the plurality of electrodes form a plurality of sets of opposite surfaces, and the gap between each set of opposite surfaces in the plurality of sets of opposite surfaces forms an electric field, and the plurality of gaps corresponding to the plurality of sets of opposite surfaces form a plurality of electric fields, so that the plurality of regions of the material channel 111 exist electric fields. When the material flows in the material channel 111, it will pass through the plurality of regions of the material channel 111, and also pass through the plurality of electric fields existing in the plurality of regions, and the material is graphitized by the Joule heat generated by the plurality of electric fields, that is, the plurality of electric fields realize the heating of the material. The time of the material passing through the plurality of electric fields is prolonged, so that the heating time of the material is prolonged, thereby providing sufficient heating time for the material, so that the material has sufficient time to complete the graphitization, thereby improving the consistency of the products obtained using the graphitization furnace.

[0074] Optionally, if the graphitization furnace 100 is arranged in a vertical manner, that is, the material channel 111 is arranged vertically, the material flows along the material channel under the action of gravity, which is consistent with the natural flow rule of the object, and the plurality of gaps are formed between the plurality of groups of opposite surfaces formed by the plurality of electrodes, and the plurality of gaps form different regions of the material channel 111 in the vertical direction. If the graphitization furnace 100 is arranged in a horizontal manner, that is, the material channel 111 is arranged horizontally, the material flows along the material channel in the horizontal direction, and the plurality of gaps are formed between the plurality of groups of opposite surfaces formed by the plurality of electrodes, and the plurality of gaps form different regions of the material channel 111 in the horizontal direction. For ease of understanding, the terms "upper", "lower", "vertical", "horizontal" and the like used in the following embodiments are described with the graphitization furnace 100 being a vertical graphitization furnace as an example.

[0075] In the embodiments of the present application, as shown in Figure 1 The first surface 121 and the second surface 131 are arranged opposite to each other in the first direction, and the first direction intersects the second direction, and the second direction is the extension direction of the material channel 111.

[0076] Specifically, the first direction intersects the second direction can be understood as that the first direction and the second direction form an angle, and the angle formed by the angle can be 30°, 40°, 50°, 60°, 70°, 80°, and the like, which is not limited in the present application. Or it can also be understood that the first direction and the second direction are not parallel. Thus, the direction of the electric field formed between the first surface 121 and the second surface 131 and the extension direction of the material channel 111 are at an angle.

[0077] It is worth noting that in the embodiments of the present application, the first surface 121 of the first electrode 120 and the second surface 131 of the second electrode 130 are arranged opposite to each other in the first direction, which can be that the projections of the first surface 121 and the second surface 131 in the first direction at least partially overlap. Optionally, the first surface 121 and the second surface 131 can both be planes, or both be curved surfaces, or one be a plane and the other be a curved surface, which is not limited in the present application.

[0078] Therefore, by arranging the first surface 121 and the second surface 131 opposite to each other in the first direction, the first direction intersects the extension direction of the material channel 111, so that the electric field direction of the electric field formed between the first surface 121 and the second surface 131 and the extension direction of the material channel 111 are at an angle, thereby forming a plurality of electric fields with such electric field direction along the extension direction of the material channel 111. The time of the material passing through the plurality of electric fields is prolonged, thereby prolonging the heating time of the material, thereby providing sufficient heating time for the material, so that the material has sufficient time to complete graphitization, thereby being able to improve the consistency of the products obtained using the graphitization furnace.

[0079] In the embodiment of the present application, the surfaces 121 of at least one of the multiple sets of opposite surfaces are parallel to the second surfaces 131.

[0080] Specifically, the first surfaces 121 and the second surfaces 131 included in at least one of the multiple sets of opposite surfaces can both be planes, and in this case, the first surfaces 121 and the second surfaces 131 can be parallel.

[0081] It is worth noting that the first surfaces 121 and the second surfaces 131 that are parallel can be the two surfaces included in one set of opposite surfaces.

[0082] Therefore, by arranging the first surfaces 121 and the second surfaces 131 to be parallel, the relative area between the first surfaces 121 and the second surfaces 131 forms a parallel and uniform electric field, and when the material passes through the parallel and uniform electric field, uniform Joule heat is generated, thereby reducing the probability of uneven heating of the material, and thus the consistency of the product obtained using the graphitization furnace can be improved.

[0083] Hereinafter, exemplary, in combination with Figures 2-5 and Figures 6-9 The structure of the multiple electrodes provided in the embodiment of the present application is described. Among them, Figures 2-5 respectively show a perspective view, a front view, a side view and a top view of the multiple electrodes and the material passage 111 included in the graphitization furnace provided in the embodiment of the present application, Figures 6-9 respectively show a perspective view, a cross-sectional view, a side view and a top view of the multiple electrodes and the material passage 111 included in another graphitization furnace provided in the embodiment of the present application.

[0084] In the embodiment of the present application, the first electrode 120 includes multiple first surfaces 121, and the multiple first surfaces 121 of one first electrode 120 form multiple sets of opposite surfaces with the second surfaces 131 of the multiple second electrodes 130.

[0085] Specifically, the first electrode 120 includes multiple first surfaces 121, for example, the first electrode 120 can be a polygon, and the multiple first surfaces 121 are multiple faces of the polygon, for example Figures 6-9 The first electrode 120 shown in the figure includes three first surfaces 121. The multiple faces of one first electrode 120 can form multiple sets of opposite surfaces with the multiple second surfaces 131, which are surfaces of the multiple second electrodes 130. For example Figure 1 As shown in the figure, the first electrode 120 located on the upper left side includes two first surfaces 121, and the two first surfaces 121 form two sets of opposite surfaces with the two second surfaces 131 of the two second electrodes 130 on the right side.

[0086] Therefore, a plurality of sets of opposite surfaces are formed by the plurality of first surfaces 121 of the first electrode 120 and the second surfaces 131 of the plurality of second electrodes 130, a plurality of sets of opposite surfaces are formed by a small number of electrodes, and a plurality of electric fields are formed by the plurality of sets of opposite surfaces, that is, a plurality of electric fields are obtained by a small number of electrodes. Thus, the use amount of electrodes is saved, and the heating of the material is realized by the plurality of electric fields, the heating time of the material is prolonged, and thus sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, and thus the consistency of the product obtained by using the graphitization furnace can be improved.

[0087] In the embodiment of the present application, as shown in Figures 2-5 The first electrode 120 includes two first surfaces 121 connected to each other, and the two first surfaces 121 form two sets of opposite surfaces with the second surfaces 131 of the two second electrodes 130 adjacent in the second direction, and the second direction is the extension direction of the material channel 111.

[0088] Specifically, as shown in Figure 3 The first electrode 120 includes two first surfaces 121 connected to each other, or in other words, the two first surfaces 121 share an edge. The two first surfaces 121 form two sets of opposite surfaces with the two second surfaces 131, respectively, and the two second surfaces 131 are the surfaces of the two second electrodes 130 adjacent to each other.

[0089] It is worth noting that, in addition to the two first surfaces 121 connected to each other, the first electrode 120 can also include other first surfaces, which are not limited in the present application.

[0090] Therefore, the two first surfaces 121 of the first electrode 120 connected to each other form two sets of opposite surfaces with the two second surfaces 131 of the two second electrodes 130 adjacent to each other, so that one first electrode 120 corresponds to two second electrodes 130, and the use amount of electrodes is saved. When the two first surfaces 121 of the first electrode 120 are connected to each other, the distance between the two first surfaces 121 is close, which results in that the distance between the two electric fields formed between the two sets of opposite surfaces is close, so that the electric field can be formed in a plurality of regions of the material channel 111, and the heating of the material is realized by the plurality of electric fields, the heating time of the material is prolonged, and thus sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, and thus the consistency of the product obtained by using the graphitization furnace can be improved.

[0091] In the embodiment of the present application, the angle between the two first surfaces 121 of the first electrode 120 is the same as the angle between the two second surfaces 131 of the second electrode 130.

[0092] Specifically, the angle between the two first surfaces 121 is the same as the angle between the two second surfaces 131, so that the opposite surfaces formed by the first surfaces 121 and the second surfaces 131 are parallel, and then a parallel and uniform electric field is formed between the parallel first surfaces 121 and the second surfaces 131.

[0093] Therefore, by setting the angle between the two first surfaces 121 of the first electrode 120 to be the same as the angle between the two second surfaces 131 of the second electrode 130, a parallel and uniform electric field can be formed between the opposite surfaces, and the Joule heat generated by the material passing through the electric field is the same, that is, the heating temperature of the material passing through different areas is the same, and the graphitization degree is the same, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0094] In some embodiments, the angle between the two first surfaces 121 of the first electrode 120 is 30°-150°. Alternatively, the angle between the two first surfaces 121 is 60°-120°.

[0095] When the angle between the two first surfaces 121 is too small, the distance between the two first surfaces 121 is close, which can cause the electrode thickness of the area surrounded by the two first surfaces 121 to be small, that is, the electrode of the area is thin, and the electrode is prone to breakage; when the angle between the two first surfaces 121 is too large, the two first surfaces 121 can be approximately understood as being in a plane, and at this time, when the two first surfaces 121 and the two second surfaces 131 are opposite to each other, the electric field can be located in the area with a short distance between the two first surfaces 121 and the two second surfaces 131, resulting in uneven distribution of the electric field. Therefore, by setting the angle between the two first surfaces 121 to be within a certain range, the direction of the electric field formed between the first surfaces 121 and the second surfaces 131 and the extension direction of the material channel 111 form an included angle within a certain range, which can improve the strength of the electrode while controlling the area of the electric field formed in the material channel 111 to concentrate the heating of the material. When the heating area is large, sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0096] In the embodiments of the present application, the first surfaces 121 and the second surfaces 131 are the same in shape and size.

[0097] Specifically, the first surfaces 121 and the second surfaces 131 are the same in shape and size, so that the areas of the first surfaces 121 and the second surfaces 131 are equal.

[0098] Therefore, by setting the shapes and sizes of the first surface 121 and the second surface 131 to be the same, the areas of the first surface 121 and the second surface 131 are equal, and when the two surfaces are arranged opposite to each other along the first direction, the overlapping area along the first direction is larger than when the shapes and sizes of the two surfaces are different, and the areas of the first surface 121 and the second surface 131 are fully utilized to form a large-area electric field, thereby saving the amount of electrodes used, and based on the large-area electric field formed between the two surfaces, the material is heated, the heating area is large, and sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained using the graphitization furnace.

[0099] In the embodiment of the present application, the material channel 111 is cylindrical, and the first surface 121 and the second surface 131 are part of an elliptical surface.

[0100] Specifically, when the material channel 111 is cylindrical, the first surface 121 and the second surface 131 are part of an elliptical surface. For example Figures 2-5 As shown, the first surface 121 and the second surface 131 each include an arc-shaped edge and a straight edge, and the arc-shaped edges of the first surface 121 and the second surface 131 can be connected to the inner side wall of the material channel 111. Alternatively, the first surface 121 and the second surface 131 can each be arc-shaped, i.e., the first surface 121 and the second surface 131 are each a figure composed of a chord and an arc corresponding to the chord.

[0101] Therefore, by setting the material channel 111 to be cylindrical and the first surface 121 and the second surface 131 to be part of an elliptical surface, when the material channel 111 is cylindrical, the first surface 121 and the second surface 131, which are part of an elliptical surface, are as close as possible to the inner side wall of the material channel 111, thereby improving the utilization rate of the first surface 121 and the second surface 131 for the material channel 111, reducing the probability of the first surface 121 and the second surface 131 blocking the flow of the material, and enabling the production efficiency of the graphitization furnace to be improved while providing a large-area electric field for heating the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained using the graphitization furnace.

[0102] It should be noted that, in addition to the material channel 111 being cylindrical, the material channel 111 can also be prismatic, frustoconical, or other shapes, which are not limited in the present application.

[0103] In the embodiment of the present application, the first surface 121 has a gap with the second surface 131 in the orthogonal projection on the plane perpendicular to the second direction, and the second direction is the extension direction of the material channel 111.

[0104] Specifically, as Figure 5or 9, the first surface 121 has a gap with the second surface 131 in the projection on the plane perpendicular to the second direction, so that the material can pass through the gap when flowing in the material channel 111.

[0105] Therefore, by having the gap between the first surface 121 and the second surface 131 in the projection on the plane perpendicular to the second direction, so that the material can pass through the gap when flowing in the material channel 111, the probability of the first surface 121 and the second surface 131 hindering the flow of the material is reduced, the flow speed of the material in the material channel 111 can be maintained in an optimal range, and the production efficiency of the graphitization furnace can be improved.

[0106] In the embodiments of the present application, the ratio of the area of the projection of the first surface 121 on the plane perpendicular to the second direction to the area of the projection of the material channel 111 on the plane perpendicular to the second direction is less than 1 / 2, and / or the ratio of the area of the projection of the second surface 131 on the plane perpendicular to the second direction to the area of the projection of the material channel 111 on the plane perpendicular to the second direction is less than 1 / 2, wherein the second direction is the extension direction of the material channel 111.

[0107] Specifically, for example Figure 5 As shown in FIG. 9, the projection of the material channel 111 on the plane perpendicular to the second direction is a circle, the area of the projection of the first surface 121 is less than half of the area of the circle, and / or the area of the projection of the second surface 131 is less than half of the area of the circle, so that the gap between the projection of the first surface 121 and the projection of the second surface 131 on the plane perpendicular to the second direction is located near the center of the material channel 111.

[0108] Therefore, by having the ratio of the area of the projection of the first surface 121 on the plane perpendicular to the second direction to the area of the projection of the material channel 111 on the plane perpendicular to the second direction be less than 1 / 2, and / or the ratio of the area of the projection of the second surface 131 on the plane perpendicular to the second direction to the area of the projection of the material channel 111 on the plane perpendicular to the second direction be less than 1 / 2, so that the material can flow smoothly in the material channel 111, the probability of the first surface 121 and the second surface 131 hindering the flow of the material is reduced, the flow speed of the material in the material channel 111 can be maintained in an optimal range, and the production efficiency of the graphitization furnace can be improved.

[0109] In the embodiments of the present application, the projection of the first electrode 120 on the plane parallel to the second direction at least partially falls between the two projections of the adjacent two second electrodes 130 on the plane parallel to the second direction, and the second direction is the extension direction of the material channel 111.

[0110] Specifically, on a plane parallel to the second direction, the orthographic projection of the first electrode 120 can fall between the orthographic projections of two adjacent second electrodes 130 in whole or in part. For example Figure 4 As shown, on a plane parallel to the second direction, the orthographic projection of the first electrode 120 falls between the orthographic projections of two second electrodes 130 in whole. It can be understood that when the graphitization furnace 100 is a vertical graphitization furnace, the first electrode 120 and the second electrode 130 are arranged staggered in the vertical direction.

[0111] Therefore, by arranging the orthographic projection of the first electrode 120 between the orthographic projections of two adjacent second electrodes 130 in whole or in part on a plane parallel to the second direction, the first electrode 120 and the second electrode 130 are arranged staggered in the extension direction of the material channel 111. Since an electric field can be formed between the first surface 121 of the first electrode 120 and the second surface 131 of the second electrode 130, when the first electrode 120 and the second electrode 130 are arranged staggered in the extension direction of the material channel 111, a plurality of electric fields between the first surface 121 and the second surface 131 can be formed along the extension direction of the material channel 111, and the area where the electric field exists in the material channel 111 is larger. Therefore, the time required for the material to pass through the electric field is longer, the heating time of the material is prolonged, and sufficient heating time is provided for the material, so that the material has sufficient time to complete graphitization, thereby improving the consistency of the products obtained by using the graphitization furnace.

[0112] In the embodiments of the present application, the first electrode 120 and the second electrode 130 both extend in the direction away from the material channel 111 along the radial direction of the material channel 111 to form a connecting end for connecting with a power supply.

[0113] Specifically, when the material channel 111 is cylindrical, the area where the first electrode 120 is located in the cylindrical material channel includes an area surrounded by one or more first surfaces 121, and similarly, the area where the second electrode 130 is located in the cylindrical material channel includes an area surrounded by one or more second surfaces 131. The area where the first electrode 120 and the second electrode 130 extend outward along the radial direction of the cylindrical material channel is the connecting end of the first electrode 120 and the second electrode 130, which can be connected with a power supply, so as to pass electricity to the electrodes in the material channel 111, so that an electric field is formed between the first surface 121 and the second surface 131. Optionally, the connecting end and the first surface 121 and the second surface 131 can be an integral structure.

[0114] Therefore, the connection ends are formed by the first electrode 120 and the second electrode 130 extending away from the material channel 111 in a radial direction of the material channel 111, and when the connection ends are connected to the power supply, the first electrode 120 and the second electrode 130 are powered, which improves the stability of the electric field formed between the first surface 121 and the second surface 131, so that the material generates Joule heat through the stable electric field, the material heating temperature is stable, and the material has sufficient temperature to complete graphitization, thereby improving the consistency of products obtained by using the graphitization furnace.

[0115] In the embodiment of the present application, the connection ends extend out of the furnace body 110 in the radial direction of the material channel 111.

[0116] In particular, the connection ends of the first electrode 120 and the connection ends of the second electrode 130 extend out of the furnace body 110 in the radial direction of the material channel 111, which realizes the electrical connection of the electrodes in the inner and outer parts of the furnace body 110.

[0117] Therefore, by extending the connection ends out of the furnace body 110 in the radial direction of the material channel 111, the first electrode 120 and the second electrode 130 realize the fixation of the electrodes through the furnace body 110 and the electrical connection of the electrodes in the inner and outer parts of the furnace body 110, which improves the stability of the positions of the first electrode 120 and the second electrode 130, and further improves the stability of the electric field generated in the furnace body 110, thereby improving the production efficiency of the graphitization furnace.

[0118] It is worth noting that in some embodiments, the first electrode 120 and the second electrode 130 can both be graphite electrodes.

[0119] It is also worth noting that the current density of the first electrode 120 and / or the second electrode 130 can be 15A / cm2-24A / cm2, the current load can be 30000A-40000A, and the resistivity can be less than 6μΩm.

[0120] In the embodiment of the present application, as shown in Figure 10 The graphitization furnace 100 can further include a heat preservation member 140 arranged on the side of the material channel 111 facing the outside of the furnace body 110.

[0121] Specifically, Figure 10 The dotted shaded area shown in the figure represents the heat preservation member 140, which can be arranged around the outer periphery of the material channel 111, thereby preserving the temperature of the heating zone formed between the first surface 121 and the second surface 131, so that the heating zone is maintained at a high temperature range, the graphitization degree of the material is uniform, and the consistency of products obtained by using the graphitization furnace can be improved.

[0122] Optionally, the diameter of the particles included in the heat preservation member 140 can be 10mm-30mm. The larger the diameter of the particles, the better the heat preservation effect.

[0123] Optionally, the thermal conductivity of the heat preservation member 140 can be 0.2W / mK-0.5W / mK. The lower the thermal conductivity, the lower the heat loss of the graphitization furnace, thereby improving the energy utilization rate.

[0124] In the embodiments of the present application, as shown in Figure 10 The heat preservation member 140 can further include a temperature-resistant member 150 arranged on the side of the heat preservation member 140 facing the outside of the furnace body 110.

[0125] Specifically, Figure 10 The diagonal shaded area shown in the figure indicates the temperature-resistant member 150, which can be arranged around the outer periphery of the heat preservation member 140 to preserve the inside of the furnace body 110, thereby reducing the loss of heat and improving the energy utilization rate.

[0126] Optionally, the temperature-resistant member 150 is a cylindrical temperature-resistant member and the heat preservation member 140 is a cylindrical heat preservation member, and the cylindrical temperature-resistant member is sleeved with the outer periphery of the cylindrical heat preservation member.

[0127] Therefore, by sleeving the cylindrical heat preservation member and the cylindrical heat insulation member, the energy loss between the two components is reduced, and the energy utilization rate and the heat preservation effect are improved.

[0128] In some embodiments, the temperature-resistant member 150 has low thermal conductivity and good insulation, which can improve the service life of the graphitization furnace.

[0129] Optionally, the heat-resistant temperature of the temperature-resistant member 150 can be 1450℃-2600℃.

[0130] The present application also provides a battery production system, which includes the graphitization furnace 100 in any of the above embodiments, and the graphitization furnace 100 is used to produce negative graphite material of the battery.

[0131] It can be understood that, in addition to including the graphitization furnace 100 to produce negative graphite material of the battery, the battery production system can also include related equipment to produce other materials of the battery.

[0132] The battery production system can be a battery production line, and multiple devices in the battery production line can be arranged in the same centralized place, or can also be arranged in separate places.

[0133] It should be noted that in the above embodiments of the present application, only part of the structure of the graphitization furnace 100 is listed, and in addition to the structures involved in the above embodiments, the graphitization furnace 100 in the present application can also include other system structures of the graphitization furnace in the related art, for example, a feeding system, a discharging system, an electrical system of the electrode, a clamping system of the electrode, an exhaust treatment system, etc. The related technical solutions of the systems can be referred to the specific description in the related art, and will not be discussed in detail herein.

[0134] Although the present application has been described with reference to the above embodiments, various modifications can be made thereto and equivalents can be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A graphitization furnace characterized by, The utility model relates to a kind of furnace body and electrode, including: Furnace body (110), material passage (111) is provided in the furnace body (110); Multiple electrodes form multiple sets of opposite faces, each set of opposite faces between the multiple sets of opposite faces has gap, the multiple sets of opposite faces corresponding multiple gaps form different regions of the material passage (111), each set of opposite faces in the multiple sets of opposite faces includes the first surface (121) of first electrode (120) and the second surface (131) of second electrode (130), and the first electrode (120) and the second electrode (130) are opposite in polarity.

2. The graphitization furnace of claim 1, wherein, The first surface (121) and the second surface (131) are oppositely arranged along a first direction, and the first direction intersects a second direction, which is an extension direction of the material passage (111).

3. The graphitization furnace of claim 1, wherein, The first surface (121) and the second surface (131) of at least one set of opposite faces in the multiple sets of opposite faces are arranged in parallel.

4. The graphitization furnace of claim 1, wherein, The first electrode (120) includes multiple first surfaces (121), and the multiple first surfaces (121) of one first electrode (120) form multiple sets of opposite faces with the second surfaces (131) of multiple second electrodes (130).

5. The graphitization furnace of claim 1, wherein, The first electrode (120) includes two first surfaces (121) connected in series, and the two first surfaces (121) form two sets of opposite faces with the second surfaces (131) of two second electrodes (130) adjacent in a second direction, which is an extension direction of the material passage (111).

6. The graphitization furnace of claim 5, wherein, The angle between the two first surfaces (121) of the first electrode (120) is the same as the angle between the two second surfaces (131) of the second electrode (130).

7. The graphitization furnace of claim 6, wherein, The angle between the two first surfaces (121) of the first electrode (120) is 30°-150°.

8. The graphitization furnace of claim 1, wherein, The first surface (121) and the second surface (131) are the same in shape and size.

9. The graphitization furnace of claim 1, wherein, The material passage (111) is cylindrical, and the first surface (121) and the second surface (131) are part of an elliptical surface.

10. The graphitization furnace of claim 1, wherein, The first surface (121) has a gap between its orthogonal projection on a plane perpendicular to a second direction and the orthogonal projection of the second surface (131) on the plane perpendicular to the second direction, which is an extension direction of the material passage (111).

11. The graphitization furnace of claim 1, wherein, The ratio of the area of the orthogonal projection of the first surface (121) on a plane perpendicular to a second direction to the area of the orthogonal projection of the material passage (111) on the plane perpendicular to the second direction is less than 1 / 2, and / or the ratio of the area of the orthogonal projection of the second surface (131) on the plane perpendicular to the second direction to the area of the orthogonal projection of the material passage (111) on the plane perpendicular to the second direction is less than 1 / 2, wherein the second direction is an extension direction of the material passage (111).

12. The graphitization furnace of claim 1, wherein, The first electrode (120) is projected onto a plane parallel to the second direction, and the projection is at least partially between the projections of two adjacent second electrodes (130) onto the plane parallel to the second direction, the second direction being the direction of extension of the material channel (111).

13. The graphitization furnace of claim 1, wherein, The first electrode (120) and the second electrode (130) each extend in a direction away from the material channel (111) in a radial direction of the material channel (111) to form a connection end for connecting to a power supply.

14. The graphitization furnace of claim 13, wherein, The connection end extends out of the furnace body (110) in the radial direction of the material channel (111).

15. The graphitization furnace of any one of claims 1-14, wherein, The graphitization furnace further comprises a heat preservation member (140) arranged on a side of the material channel (111) facing the outside of the furnace body (110).

16. The graphitization furnace of claim 15, wherein, The heat preservation member (140) comprises particles with a diameter of 10-30 mm.

17. The graphitization furnace of claim 15, wherein, The heat preservation member (140) has a thermal conductivity of 0.2-0.5 W / mK.

18. The graphitization furnace of claim 15, wherein, The graphitization furnace further comprises a temperature-resistant member (150) arranged on a side of the heat preservation member (140) facing the outside of the furnace body (110).

19. The graphitization furnace of claim 18, wherein, The temperature-resistant member (150) is a cylindrical temperature-resistant member, and the heat preservation member (140) is a cylindrical heat preservation member, the cylindrical temperature-resistant member being sleeved on the outer periphery of the cylindrical heat preservation member.

20. A battery production system characterized by comprising: The graphitization furnace comprises: The graphitization furnace according to any one of claims 1-19, for producing negative electrode graphite material for batteries.

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