CN219454651U - Graphitizing furnace and electrode structure thereof - Google Patents

Abstract

The application relates to a graphitization furnace and electrode structure thereof, the furnace end has the mounting hole, the inner wall of mounting hole is provided with insulating cover, the insulation board sets up in the port of mounting hole towards the furnace end outside, the mounting hole is provided with insulating ring plate towards the inboard port outer fringe of furnace end, the carbon brick board sets up in the port of mounting hole towards the furnace end inboard, the trompil that many power supply electrodes worn to establish has all been seted up to insulation board and carbon brick board, insulation board, carbon brick board and insulating cover form the filling space, the intussuseption of filling space is filled with the electrically conductive powder that the compactness is greater than 90%. The electrode structure has good insulativity, the electric field in the graphitizing furnace is uniformly distributed, the stability of the graphitizing process of the cathode material can be ensured, the electrode tip discharge can be effectively prevented, the current density on the electrode is reduced, the electrode is prevented from heating seriously, the electrode is effectively protected, the original furnace end is replaced by a carbon brick plate, and therefore, the furnace end can be prevented from being burnt out easily due to high temperature generated by the resistance material, and the financial and material resources and manpower are saved.

Description

Graphitizing furnace and electrode structure thereof

Technical Field

The application relates to the technical field of graphitization furnaces, in particular to a graphitization furnace and an electrode structure thereof.

Background

In lithium ion battery materials, the cathode material belongs to an important component part, and can have great influence on the performance of the whole battery. Currently, the negative electrode material is mainly a carbon material, and the carbon material needs graphitization treatment to be used. Graphitization of the negative electrode material means that carbon atoms are converted into a regular hexagonal plane network structure from random irregular arrangement at high temperature, namely a graphite microcrystalline structure, and the purpose of the graphitization is to obtain performances of high electric conductivity, high heat conduction, corrosion resistance, friction resistance and the like of graphite. Graphitizing furnaces are important equipment for graphitizing the cathode material, and are industrially applied to Acheson graphitizing furnaces, inner-string graphitizing furnaces, vertical graphitizing furnaces and the like.

The conventional acheson graphitizing furnace is generally composed of a furnace wall 10, a furnace end 20 and an electrode 30 (see fig. 1), wherein the electrode 30 passes through the middle part of the furnace end 20 and protrudes, in the process of electrifying graphitizing, the protruding electrode 30 is inserted into a resistor material 40 to discharge, so that the resistor material 40 generates high temperature of 2000-3000 ℃ after electrifying, the furnace end 20 is generally built by refractory bricks due to the fact that the resistor material 40 is directly contacted with the furnace end 20, the furnace end 20 is easily burnt out by the high temperature generated by the resistor material 40, the furnace end 20 has high value, a large amount of time is required for maintaining the furnace end 20, and a large amount of financial resources and manpower are consumed.

Meanwhile, since the electrode is inserted into the furnace end 20 and protrudes, in the process of electrified graphitization, the protruding electrode 30 is easy to generate tip discharge, so that the electric field distribution in the graphitization furnace is uneven (generally, the central electric field intensity is high, the electric field of the resistor 40 is weaker when the temperature of the resistor 40 is higher, the electric field is closer to the furnace wall 10, the temperature of the resistor 40 is lower), so that the temperature distribution in the graphitization furnace is uneven, in the temperature environment, the stability of the graphitization process of the cathode material cannot be ensured, the uniformity and the yield of the final product are lower, and the current density on the electrode 30 is higher due to the protruding electrode 30 tip discharge, the electrode 30 is seriously heated, the burning loss is easy, and a great amount of time, financial and manpower are also required for maintaining and replacing the electrode 30.

Disclosure of Invention

Based on this, it is necessary to solve the problems that the furnace end of the graphitizing furnace is easily burnt by the heat generated by the resistor material in the prior art, so that a great amount of financial resources, material resources and manpower are consumed, and meanwhile, the raised electrode 30 is easy to generate tip discharge, so that the uniformity and the yield of the final product are low, and the electrode 30 is seriously heated and easily burnt. The application provides a graphitization furnace and an electrode structure thereof, which can solve the problems in the prior art.

The utility model provides an electrode structure of graphitization stove installs in graphitization stove's furnace end, its characterized in that includes many electrodes, insulation board and carbon brick board, the furnace end has the mounting hole, the inner wall of mounting hole is provided with insulating sleeve, the insulation board set up in the mounting hole orientation the port in the furnace end outside, the mounting hole orientation the inboard port outer fringe of furnace end is provided with insulating ring board, the carbon brick board set up in the mounting hole orientation the inboard port of furnace end, the insulation board with the many trompils that supply the electrode worn to establish are all offered to the carbon brick board, and many supplies electrode and a plurality of trompil one-to-one set up, just the electrode orientation the inboard tip protrusion of furnace end carbon brick board 5cm to 10cm, the insulation board carbon brick board with insulating sleeve forms the filling space, the filling space intussuseption is filled with the conductive powder that the compactness is greater than 90%.

Preferably, in the electrode structure of a graphitizing furnace, the number of the electrodes is 9, the electrodes are uniformly distributed in 3 rows, and 3 electrodes in each row are arranged, and the distance between any one electrode and the adjacent electrode is equal.

Preferably, in the electrode structure of a graphitizing furnace, supporting conductive blocks are disposed between any two adjacent electrodes and between the electrodes and the insulating sleeve in the vertical direction.

Preferably, in the electrode structure of a graphitizing furnace, conductive sealant is filled between the inner wall of the opening of the carbon brick plate and the electrode.

Preferably, in the electrode structure of a graphitizing furnace, the conductive powder is acetylene black, and the particle size of the conductive powder is less than 0.05mm.

Preferably, in the electrode structure of a graphitizing furnace, the insulating ring plate includes an insulating layer and a heat insulating layer, and the heat insulating layer is located between the insulating layer and the inner side of the furnace end.

A graphitization furnace comprising an electrode structure of a graphitization furnace as described above.

Preferably, in the graphitizing furnace, the graphitizing furnace comprises the furnace head and the furnace body, the electrode structure is installed on the furnace head, a furnace bottom insulating layer is arranged at the bottom of the furnace body, the distance between the bottom of the carbon brick plate and the bottom of the furnace body is smaller than the thickness of the furnace bottom insulating layer, a side wall of the furnace body is provided with a side wall insulating layer, and the distance between the side part of the carbon brick plate and the side wall of the furnace body on the same side is smaller than the thickness of the side wall insulating layer.

The technical scheme that this application adopted can reach following beneficial effect:

in this application embodiment discloses graphitization stove and electrode structure thereof, insulating cover encircles electrode, conductive powder and carbon brick board, plays insulating effect, avoids the heavy current conduction to the furnace end and extravagant and the incident appears, and the insulation board lid is established at the port of mounting hole towards the furnace end outside, just also covers conductive powder, plays insulating effect, and the insulation board can also be used for forming the filling space. The insulating annular plate is arranged to avoid waste and safety accidents caused by current conducted to the furnace end through the resistor material, and has a certain heat insulation effect, so that the furnace end is prevented from being burnt out easily due to high temperature generated by the resistor material. During operation, the electrode structures arranged on the two furnace heads of the graphitizing furnace form parallel plate capacitors so as to form uniform and strong electric fields in the graphitizing furnace, so that the electric fields in the graphitizing furnace are uniformly distributed, the temperature distribution in the graphitizing furnace is uniform, the stability of the graphitizing process of the cathode material can be ensured in the temperature environment, and the uniformity and the yield of the final product are higher. The maximum protruding carbon brick board of electrode tip does not exceed 10cm, and the carbon brick board of every electrode week side also is used for conduction current, can effectively prevent electrode point discharge, and conductive powder and carbon brick board can reduce the current density on the electrode simultaneously, prevent that the electrode from generating heat seriously, effectively protect the electrode, avoid it to be burnt out easily, save financial resources and materials manpower. When the furnace end fire brick is in operation, the resistance material is in direct contact with the carbon brick plate, the carbon brick plate replaces the original furnace end fire brick, the resistance material cannot be in contact with the fire brick, and the carbon brick plate has higher heat insulation performance, so that the furnace end can be prevented from being burnt out easily due to high temperature generated by the resistance material, and financial resources and material resources and manpower are saved.

Drawings

Fig. 1 is a schematic structural diagram of a graphitizing furnace in the prior art, in which: furnace wall 10, furnace end 20, electrode 30, resistor 40;

FIG. 2 is a schematic diagram of a graphitizing furnace according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a graphitization furnace according to an embodiment of the present disclosure at another view angle;

FIG. 4 is a schematic view of a furnace end and a furnace body according to an embodiment of the present disclosure;

fig. 5 is a schematic view of a part of the structure of a graphitizing furnace according to an embodiment of the present application.

Wherein: furnace end 100, mounting hole 110, insulating sleeve 120, insulating annular plate 130, electrode 200, insulating plate 300, carbon brick plate 400, opening 500, supporting conductive block 600, furnace body 700, furnace bottom insulating layer 710, and side wall insulating layer 720.

Description of the embodiments

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 2 to 5, an embodiment of the present application discloses an electrode structure of a graphitizing furnace, which is installed on a furnace head 100 of the graphitizing furnace, wherein the graphitizing furnace has two furnace heads 100, each of which is installed with an electrode structure, one of which is connected with a positive electrode of a power supply, and the other of which is connected with a negative electrode of the power supply. The disclosed electrode structure includes a plurality of electrodes 200, an insulating plate 300, and a carbon brick plate 400, wherein:

the furnace end 100 is provided with a mounting hole 110, the mounting hole 110 penetrates through the furnace end 100 and communicates the inside and the outside of the furnace end 100, the furnace end 100 is built by refractory bricks, and the mounting hole 110 is reserved in the building process. The inner wall of the mounting hole 110 is provided with an insulating sleeve 120, and after the furnace end 100 is built and the mounting hole 110 is reserved, the inner wall of the mounting hole 110 is provided with an insulating layer to form the insulating sleeve 120. The insulating plate 300 is disposed at a port of the mounting hole 110 facing the outside of the burner 100, the insulating plate 300 covers a port of the mounting hole 110 facing the outside of the burner 100, and a peripheral edge of the insulating plate 300 is bonded to an inner wall of the insulating sleeve 120. The outer edge of the port of the mounting hole 110 towards the inner side of the burner 100 is provided with an insulating ring plate 130, the carbon brick plate 400 is arranged at the port of the mounting hole 110 towards the inner side of the burner 100, the carbon brick plate 400 covers the port of the mounting hole 110 towards the inner side of the burner 100, the insulating ring plate 130 is arranged around the carbon brick plate 400, and the carbon brick plate 400 and the insulating ring plate 130 form the inner side surface of the burner 100.

The insulating plate 300 and the carbon brick plate 400 are provided with a plurality of openings 500 through which the electrodes 200 penetrate, the plurality of electrodes 200 and the plurality of openings 500 are arranged in a one-to-one correspondence, the electrodes 200 penetrate through the openings 500, the ends of the electrodes 200, which face the inner side of the furnace end 100, protrude out of the carbon brick plate 400 by 5cm to 10cm, the insulating plate 300, the carbon brick plate 400 and the insulating sleeve 120 form a filling space, conductive powder with compactness of more than 90% is filled in the filling space, under the condition that the electrodes 200 are electrified, the electrodes 200, the conductive powder and the carbon brick plate 400 jointly discharge to form a flat plate electrode, current is conducted from the electrodes 200 to the carbon brick plate 400 through the conductive powder, the current can also be directly conducted from the electrodes 200 to the carbon brick plate 400, the conductive powder increases a conductive channel for conducting the current to the carbon brick plate 400, and the conductive powder is further used for reducing the current density on the electrodes 200.

The filling space is filled with conductive powder with compactness of more than 90%, and the limitation is to avoid burning out the furnace end 100 due to high temperature generated by discharge arc discharge of gaps in the conductive powder.

In the electrode structure of the graphitizing furnace disclosed in the embodiment of the application, the insulating sleeve 120 surrounds the electrode 200, the conductive powder and the carbon brick plate 400, so as to play an insulating effect, avoid waste and safety accidents caused by large current conduction to the furnace end 100, and the insulating plate 300 covers the port of the mounting hole 110 towards the outer side of the furnace end 100, so that the conductive powder is covered, the insulating effect is achieved, and the insulating plate 300 can also be used for forming a filling space. The insulating ring 130 is provided to prevent the electric current from being transmitted to the burner 100 through the resistor material and wasting and causing safety accidents, and has a certain heat insulation effect, so as to prevent the burner 100 from being burnt out easily due to the high temperature generated by the resistor material. During operation, the electrode structures mounted on the two furnace heads 100 of the graphitizing furnace form parallel plate capacitors so as to form uniform electric fields in the graphitizing furnace and ensure uniform electric field distribution in the graphitizing furnace, so that temperature distribution in the graphitizing furnace is uniform, stability of the graphitizing process of the cathode material can be ensured in the temperature environment, and uniformity and yield of the final product are high. The maximum protruding carbon brick plate 400 of electrode 200 tip does not exceed 10cm, and the carbon brick plate 400 of every electrode 200 week side also is used for the conduction current, can effectively prevent electrode 200 point discharge, and conductive powder and carbon brick plate 400 can reduce the current density on the electrode 200 simultaneously, prevent electrode 200 generates heat seriously, effectively protect electrode 200, avoid it to be burnt out easily, save financial resources and materials manpower. In operation, the resistance material is in direct contact with the carbon brick plate 400, the carbon brick plate 400 replaces the original furnace end refractory brick, the resistance material cannot be in contact with the refractory brick (only in contact with the insulating ring plate 130), and the carbon brick plate 400 has higher heat insulation performance, so that the furnace end 100 can be prevented from being burnt out easily due to high temperature generated by the resistance material, and financial resources and manpower are saved.

Therefore, the electrode structure disclosed by the application can solve the problems that in the prior art, the furnace end of the graphitizing furnace is easily burnt by heat generated by the resistor material, so that a large amount of financial resources, material resources and manpower are consumed, meanwhile, due to the fact that the protruding electrode 30 is easy to generate point discharge, the uniformity and the yield of the final product are low, and the electrode 30 is heated seriously, so that the burning loss is easy, and the financial resources, material resources and manpower brought by maintenance and replacement are saved.

Meanwhile, the insulating plate 300 and the carbon brick plate 400 can play a structural supporting role, support the electrode 200, and serve to form a filling space, one object for multiple purposes.

Further, the surface area of the carbon brick plate 400 occupies more than 80% of the area of the inner side surface of the furnace end 100, and is located at the center, so that when the graphite furnace works, after an auxiliary layer (a furnace bottom heat insulation layer 710 and a side wall heat insulation layer 720 hereinafter) is laid in the graphite furnace, the area leaked from the inner side surface of the furnace end 100 is the carbon brick plate 400 and the electrode 200, and the working area in the graphite furnace is located in a uniform electric field formed by parallel plate capacitors.

Preferably, the number of the electrodes 200 is 9, 3 rows and 3 lines are uniformly arranged, and the distance between any one electrode 200 and the adjacent electrode 200 is equal, so that the 9 electrodes 200 are uniformly arranged, the uniform current distribution on the electrode plate formed by the carbon brick plate 400 and the electrode 200 is facilitated, the current density is uniform, the influence on the uniformity of an electric field due to high local current density is avoided, and the thermal stress damage of the carbon brick plate 400 and the electrode 200 is also easily caused by high temperature generated by high local current density is avoided.

In this application, the electrode 200 is supported by the insulating plate 300 and the carbon brick plate 400, but the electrode 200 is usually a metal block, and has a large weight, and the insulating plate 300 and the carbon brick plate 400 are damaged by stress after long-term use, and the strength is lowered, so that collapse of the supporting structure is likely to occur. Based on this, in an alternative embodiment, a supporting conductive block 600 may be provided between any adjacent two electrodes 200 and between the electrodes 200 and the insulating sheath 120 in the vertical direction. The supporting conductive block 600 can play a role in supporting the electrode 200, improve the supporting strength of the electrode 200, avoid the situation that the supporting structure collapses easily, play a conductive role, prevent the filled conductive powder from reducing the influence on the conductive structure and the conductive effect due to the space occupied by the conductive powder by the supporting conductive block 600 (for example, the non-conductive supporting block is arranged, and the resistance of the electrode structure is increased, so that the electrode structure is heated seriously).

Preferably, a conductive sealant is filled between the inner wall of the opening 500 of the carbon brick plate 400 and the electrode 200, and the gap between the inner wall of the opening 500 of the carbon brick plate 400 and the electrode 200 is sealed by using the conductive sealant, so that arc discharge caused by the existence of the gap is avoided, burning loss of the electrode 200 and the carbon brick plate 400 is prevented, and the reliability of the electrode structure is improved.

Preferably, the conductive powder is acetylene black, the particle size of the conductive powder is smaller than 0.05mm, the acetylene black is used as a filler, the conductivity is good, the manufacturing cost is low, the conductive powder is fine by controlling the particle size of the conductive powder to be smaller than 0.05mm, the fine conductive powder can be tamped, and the problem that the furnace end 100 burns out due to high temperature caused by discharge arc discharge of gaps in the conductive powder is avoided.

Preferably, the insulating ring plate 130 includes an insulating layer and a heat insulating layer, and the heat insulating layer is located between the insulating layer and the inner side of the burner 100, so that the insulating ring plate 130 can play a role in insulation and also play a role in heat insulation, and the burner 100 is protected from being burnt out to a certain extent.

The application also discloses a graphitization furnace, including the electrode structure of a graphitization furnace as described in any embodiment above, this graphitization furnace's insulativity is good, and electric field distribution in the graphitization furnace is even, can guarantee the stability of negative pole material graphitization process, and then makes the homogeneity and the yield of final product all higher. Meanwhile, the resistance material is in direct contact with the carbon brick plate 400, the carbon brick plate 400 replaces the original furnace end refractory brick, the resistance material cannot be in contact with the refractory brick, and the carbon brick plate 400 has higher heat insulation performance, so that the furnace end 100 can be prevented from being burnt out easily due to high temperature generated by the resistance material, and financial resources and manpower are saved.

Specifically, the graphitizing furnace comprises a furnace end 100 and a furnace body 700, the electrode structure is installed on the furnace end 100, a furnace bottom insulating layer 710 is arranged at the bottom of the furnace body 700, a side wall insulating layer 720 is arranged on the side wall of the furnace body 700, the distance between the bottom of the carbon brick plate 400 and the bottom of the furnace body 700 is smaller than the thickness of the furnace bottom insulating layer 710, that is, after the furnace bottom insulating layer 710 is paved at the bottom of the furnace body 700, the bottom insulating layer 710 floods the bottom of the carbon brick plate 400, the distance between the side wall of the carbon brick plate 400 and the side wall of the furnace body 700 at the same side is smaller than the thickness of the side wall insulating layer 720, similarly, after the side wall insulating layer 720 is paved at the side wall of the furnace body 700, the side wall insulating layer 720 floods the side wall of the carbon brick plate 400, and the resistor material is placed in the space surrounded by the furnace bottom insulating layer 710 and the side wall insulating layer 720, so that the area leaked from the inner side surface of the furnace end 100 is the carbon brick plate 400 and the electrode 200, and the working area in the graphite furnace is located in a uniform electric field formed by the parallel plate capacitance.

Meanwhile, the contact between the resistance material and the insulating annular plate 130 at the periphery of the carbon brick plate 400 can be avoided, and due to the fact that the temperature of the resistance material is higher in working, even if the insulating annular plate 130 can play a certain role in heat insulation, the insulating annular plate 130 is burnt out for many times by the heat generated by the resistance material, the structural stability of the graphitization furnace is improved, and financial resources, physical resources and manpower brought by maintenance and replacement are saved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (8)

1. The utility model provides an electrode structure of graphitization stove installs in furnace end (100) of graphitization stove, its characterized in that includes many electrode (200), insulation board (300) and carbon brick board (400), furnace end (100) have mounting hole (110), the inner wall of mounting hole (110) is provided with insulating sleeve (120), insulation board (300) set up in mounting hole (110) orientation port in furnace end (100) outside, mounting hole (110) orientation port outer fringe in furnace end (100) is provided with insulating annular plate (130), carbon brick board (400) set up in mounting hole (110) orientation port in furnace end (100), insulation board (300) with carbon brick board (400) all offer many confession trompil (500) that electrode (200) were worn to establish, many confession electrode (200) and a plurality of trompil (500) one-to-one set up, just electrode (200) orientation terminal protrusion in furnace end (100) inboard carbon brick board (400) 5cm to 10cm, insulating plate (400) are filled in insulating plate (400) filling space, insulating plate (120% is filled in the filling space.

2. The electrode structure of a graphitizing furnace according to claim 1, wherein the number of the electrodes (200) is 9, 3 electrodes are uniformly arranged in 3 rows, and the distance between any one electrode (200) and the adjacent electrode (200) is equal.

3. An electrode structure of a graphitizing furnace according to claim 2, characterized in that supporting conductive blocks (600) are provided between any adjacent two of the electrodes (200) and between the electrodes (200) and the insulating sheath (120) in the vertical direction.

4. The electrode structure of a graphitization furnace according to claim 1, characterized in that a conductive sealant is filled between the inner wall of the opening (500) of the carbon brick plate (400) and the electrode (200).

5. The electrode structure of a graphitizing furnace according to claim 1, wherein the conductive powder is acetylene black, and the particle size of the conductive powder is less than 0.05mm.

6. The electrode structure of a graphitization furnace according to claim 1, characterized in that the insulating ring plate (130) comprises an insulating layer and a heat insulating layer, the heat insulating layer being located between the insulating layer and the inner side of the furnace head (100).

7. A graphitization furnace comprising an electrode structure of the graphitization furnace according to any one of claims 1 to 6.

8. The graphitizing furnace according to claim 7, comprising said furnace head (100) and a furnace body (700), said electrode structure being mounted to said furnace head (100), a bottom portion of said furnace body (700) being provided with a furnace bottom insulating layer (710), a distance between a bottom portion of said carbon brick plate (400) and a bottom portion of said furnace body (700) being smaller than a thickness of said furnace bottom insulating layer (710), a side wall of said furnace body (700) being provided with a side wall insulating layer (720), a distance between a side portion of said carbon brick plate (400) and a side wall of said furnace body (700) on the same side being smaller than a thickness of said side wall insulating layer (720).