Graphitization furnace for artificial graphite cathode material

Abstract

The utility model relates to the technical field of graphitization furnaces, and aims to solve the problems that the existing graphitization furnace is non-uniform in resistance material filling, non-uniform in temperature rise in a furnace body, limited in cathode material filling amount in a crucible and low in effective utilization rate of a space in the furnace. The utility model provides a graphitization furnace for an artificial graphite cathode material. The graphitization furnace comprises a furnace body and a plurality of square crucibles, the plurality of square crucibles are distributed in the furnace body in a matrix manner; a plurality of square crucibles in the same row are connected in series through a first connecting assembly; the plurality of square crucibles in the same column are connected through a second connecting assembly; the first connecting assembly is clamped with the second connecting assembly; a resistor filling layer is arranged between every two adjacent rows of square crucibles; a thermal insulation layer surrounding the plurality of square crucibles is arranged in the furnace body; according to the graphitization furnace for the artificial graphite cathode material, the square crucible with the filling amount higher than that of a traditional round crucible is adopted, the effective space in the furnace is fully utilized, the graphitization furnace is more durable, and the use frequency of the graphitization furnace is higher than that of the traditional round crucible.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of graphitization furnace, specifically to a kind of artificial graphite negative material graphitization furnace. BACKGROUND

[0002] Graphitization furnace is an industrial equipment that converts non-graphitic carbon materials into graphitic carbon through high-temperature heat treatment (usually up to 2200℃-3000℃). Its core principle is to use high temperature to promote the transformation of carbon atoms from disordered structure (such as amorphous carbon) to ordered layered graphite crystal structure, thereby improving the electrical conductivity, thermal conductivity, thermal stability and chemical inertness of the material. Since graphitization needs to be completed at extremely high temperature, traditional external heat sources (such as gas) cannot meet the requirements, so modern graphitization furnaces mostly use "internal heat source" resistance heating technology to achieve high temperature by directly heating the material with electric current.

[0003] In the prior art, traditional round crucibles and compartment-type graphitization furnaces are usually used. The core principle of the compartment-type graphitization furnace is to directly heat the cavity (compartment) surrounded by graphite plates with electric current, so that the carbon atoms in the material can transform from disordered structure to ordered graphite crystal structure at high temperature (usually 2200℃-3000℃). For example, the patent with publication number CN212720857U discloses a multi-unit compartment-type graphitization furnace, which has multiple heating boxes inside the furnace body that are in contact with each other, and the negative material is added to the multiple heating boxes for graphitization.

[0004] However, due to the shape of the traditional round crucible, when it is placed in the furnace, there is a large gap around the round crucible, which limits the utilization of the space inside the furnace core. Moreover, when the resistance material is loaded into the furnace, it cannot be evenly filled, which leads to inconsistent distribution of the filled material, and thus has different effects on the current distribution of the furnace core, affecting the uniformity of the furnace core temperature and causing a large temperature difference during the later power transmission. The production cycle of the compartment-type graphitization furnace is longer, and it is prone to powder running and local high temperature, which may cause furnace explosion accidents.

[0005] Based on the above description, there is an urgent need for an artificial graphite negative material graphitization furnace that can evenly load resistance material and uniformly heat the furnace core. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide an artificial graphite negative material graphitization furnace to solve the technical problems of uneven loading of resistance material in existing graphitization furnaces, uneven heating of the furnace body, and limited filling of negative material in the crucible, as well as low effective utilization of the space in the furnace.

[0007] The embodiments of the utility model are implemented by the following technical solutions:

[0008] The utility model provides a kind of artificial graphite negative electrode material graphitization furnace, including furnace body, multiple square crucibles and multiple the square crucibles are distributed in the inside of the furnace body in matrix;Same multiple the square crucibles between through first connecting component are connected in series;Multiple the square crucibles between same column are connected by second connecting component;The first connecting component is connected with the second connecting component;Resistance filling layer is equipped between two adjacent rows of the square crucibles;The furnace body is equipped with the heat preservation layer surrounding multiple the square crucibles.

[0009] As preferred, the square crucible is equipped with four R corners.

[0010] As preferred, the first connecting component includes multiple frame bodies, multiple first connecting pieces and multiple second connecting pieces;Multiple the first connecting pieces and multiple the second connecting pieces are alternatively arranged in the end of multiple the frame bodies passing through the square crucible;Adjacent the first connecting piece and the second connecting piece are matched and connected.

[0011] As preferred, the first connecting piece includes a pair of first inverted L-shaped plates with downward opening;The second connecting piece includes a pair of second inverted L-shaped plates with upward opening;The opening end of the first inverted L-shaped plate is connected with the opening end of the second inverted L-shaped plate.

[0012] As preferred, the opening end of the first inverted L-shaped plate is spaced apart and provided with multiple first limiting blocks;The opening end of the second inverted L-shaped plate is spaced apart and provided with multiple second limiting blocks;First limiting groove is left between adjacent first limiting blocks for the second limiting block to be embedded.

[0013] As preferred, the end of the frame body embedded in the square crucible is provided with a landing for receiving the cover body.

[0014] As preferred, the second connecting component includes multiple positioning strips, multiple first strips and multiple second strips;The bottom of multiple the square crucibles is relatively provided with a pair of the positioning strips;The first inverted L-shaped plate is vertically provided with a first strip away from the second inverted L-shaped plate;The second inverted L-shaped plate is vertically provided with a second strip away from the first inverted L-shaped plate;Second limiting groove is left between the first strip and the second strip for the positioning strip to be embedded.

[0015] The technical scheme of the utility model embodiment has at least the following advantages and beneficial effects:

[0016] The utility model discloses a square crucible can be adapted to the artificial graphite negative electrode material graphitization furnace of cuboid shape, compared with traditional circular crucible, square crucible can be more adapted to the shape of furnace body, and then effectively utilize the effective space in the furnace, adopt square crucible can improve filling amount to about 20%.

[0017] By adopting the square crucible, it is also convenient to uniformly fill the electrically conductive layer, the heat preservation layer and the like, to ensure the thickness and uniformity of each layer, and the production cycle is shorter compared with the chamber furnace.

[0018] The plurality of crucibles are uniformly and stably installed in the interior of the furnace body in a matrix shape at equal distances through the first and second connecting assemblies, and then it is convenient to uniformly fill the resistance material as the resistance filling layer between the upper and lower square crucibles, so as to uniformly and efficiently heat the square crucibles and the negative material in the interior of the square crucibles. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the furnace body structure in the utility model;

[0020] Figure 2 It is a schematic diagram of the square crucible layer structure in the utility model; Figure 1

[0021] Figure 3 It is an enlarged schematic diagram of the partial structure A in the utility model; Figure 2

[0022] Figure 4 It is a top view of the square crucible in the utility model;

[0023] Figure 5 It is a front view of the square crucible in the utility model;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting assembly in the utility model;

[0025] Figure 7 It is an enlarged schematic diagram of the partial structure B in the utility model. Figure 6

[0026] Icon: 1-furnace body, 2-square crucible, 3-first connecting assembly, 31-frame body, 32-first connecting piece, 33-second connecting piece, 4-second connecting assembly, 41-positioning strip block, 42-first strip plate, 43-second strip plate, 5-resistance filling layer, 6-heat preservation layer, 7-R angle, 8-first limiting block, 9-second limiting block, 10-stand, 11-cover. DETAILED DESCRIPTION

[0027] The specific embodiments are described below in combination with the drawings.

[0028] Example 1

[0029] Please refer to Figures 1 to 7 The utility model provides the following technical scheme: a graphitized furnace for artificial graphite negative material, which is suitable for the case of artificial graphite negative material.

[0030] Specifically, as Figure 1 and Figure 2 ​​​As shown in the figure, a kind of artificial graphite negative electrode material graphitization furnace, including furnace body 1, multiple square crucibles 2;Multiple square crucibles 2 are distributed in the inside of furnace body 1 in matrix;Multiple square crucibles 2 in the same row are connected in series by first connecting assembly 3;Multiple square crucibles 2 in the same column are connected by second connecting assembly 4;First connecting assembly 3 and second connecting assembly 4 are clamped;Resistance filling layer 5 is arranged between two adjacent rows of square crucibles 2;Furnace body 1 is provided with heat preservation layer 6 surrounding multiple square crucibles 2.

[0031] In the embodiment, by adopting square crucible 2, artificial graphite negative electrode material graphitization furnace of cuboid shape can be adapted, compared with traditional circular crucible, square crucible 2 can better adapt to the shape of furnace body, and then effectively utilize the effective space in the furnace, not only higher filling capacity, but also facilitate uniform filling of resistance filling layer 5, heat preservation layer 6 and the like, to ensure the thickness and uniformity of each layer, and compared with compartment type furnace, production cycle is shorter;Multiple square crucibles 2 in the same layer are connected in series by first connecting assembly 3;And adjacent upper and lower square crucibles 2 are connected by second connecting assembly 4, so that multiple square crucibles 2 are evenly and equidistantly arranged in matrix in the inside of furnace body 1, and then resistance material is filled between upper and lower square crucibles 2 as resistance filling layer 5, to uniformly and efficiently heat square crucible and negative electrode material in the inside of square crucible.

[0032] In the embodiment, when square crucible 2 is installed, first, carbon black is laid on the bottom of furnace body 1, then heat preservation material and resistance material are laid on the furnace bottom in sequence, then multiple square crucibles 2 are loaded into furnace body 1 in the above manner, finally resistance material is loaded again, and chimney is installed on the top of furnace body 1, heat preservation material is loaded on both sides and top upper layer of furnace body 1;The basic principle of heating is the same as that of the existing artificial graphite negative electrode material graphitization furnace, multiple square crucibles 2 in the inside of furnace body 1 serve as heating body, and high temperature is generated when current flows through multiple square crucibles 2 in the furnace, so as to rapidly heat negative electrode material in square crucible 2.

[0033] Specifically, as shown in the figure, Figure 2 And Figure 4 Square crucible 2 is provided with four R corners 7.

[0034] In the embodiment, by setting four corners of square crucible 2 as R corner 7, sharp edges and corners are replaced by circular arc transition, which can disperse local stress, delay crack propagation and improve the service life of square crucible;It can also enhance the overall structural rigidity of square crucible 2, reduce deformation caused by material thermal expansion difference, and improve the uniformity of heat transfer and material distribution.

[0035] Specifically, as shown in the figure, Figures 2 to 5As shown, the first connecting assembly 3 includes a plurality of frame bodies 31, a plurality of first connecting pieces 32 and a plurality of second connecting pieces 33; the plurality of first connecting pieces 32 and the plurality of second connecting pieces 33 are alternately arranged at one end of the plurality of frame bodies 31 penetrating the square crucible 2; the adjacent first connecting piece 32 and the second connecting piece 33 are matched and connected.

[0036] In this embodiment, the frame body 31 is embedded in one end of the square crucible 2 and is provided with a supporting platform 10 for receiving the cover body 11; that is, the cover body 11 is arranged in the frame body 31 and is supported on the supporting platform 10, and the frame body 31 is arranged on the open end of the square crucible 2 through the first connecting piece 32 and the second connecting piece 33, and then after the cover body 11 covers the opening at the top of the square crucible 2, it is also convenient to uniformly fill the resistance material in the frame body 31, and in the case that each square crucible 2 is arranged with the frame body 31 to install the cover body 11, the thickness of the electrically conductive material can be accurately ensured to be filled uniformly between the upper and lower square crucibles 2, thereby ensuring the uniformity of the furnace heating under the action of the current and fully improving the quality of the product.

[0037] Specifically, as shown in Figures 3 to 7 The first connecting piece 32 includes a pair of first inverted L-shaped plates with openings downward; the second connecting piece 33 includes a pair of second inverted L-shaped plates with openings upward; the opening end of the first inverted L-shaped plate is connected with the opening end of the second inverted L-shaped plate. The opening end of the first inverted L-shaped plate is provided with a plurality of first limiting blocks 8; the opening end of the second inverted L-shaped plate is provided with a plurality of second limiting blocks 9; a first limiting groove is arranged between the adjacent first limiting blocks 8 for embedding the second limiting block 9.

[0038] In this embodiment, the first inverted L-shaped plate and the second inverted L-shaped plate are arranged between the adjacent two square crucibles 2, and then the opening end of the first inverted L-shaped plate is overlapped with the opening end of the second inverted L-shaped plate, thereby playing a role of alignment to improve the accuracy and efficiency of installing the square crucible 2; further, in order to prevent the first inverted L-shaped plate and the second inverted L-shaped plate from being misaligned after being overlapped, a plurality of second limiting blocks 9 are embedded in a plurality of first limiting grooves, thereby achieving limiting clamping after overlapping, and the assembly and disassembly are convenient, simple and efficient.

[0039] Specifically, as shown in Figure 5 and Figure 6 The second connecting assembly 4 includes a plurality of positioning strip blocks 41, a plurality of first strip plates 42 and a plurality of second strip plates 43; the bottom of the plurality of square crucibles 2 is arranged with a pair of positioning strip blocks 41; the first inverted L-shaped plate is provided with a first strip plate 42 at one end away from the adjacent second inverted L-shaped plate; the second inverted L-shaped plate is provided with a second strip plate 43 at one end away from the adjacent first inverted L-shaped plate; the first strip plate 42 and the second strip plate 43 are provided with a second limiting groove for embedding the positioning strip block 41.

[0040] In the embodiment, the positioning strip block 41 is arranged at the bottom of the square crucible 2, and the first strip plate 42 and the second strip plate 43 are arranged at the top of the first inverted L-shaped plate and the second inverted L-shaped plate, so as to form the second limiting groove for embedding the positioning strip block 41. Therefore, the limiting connection of the upper and lower square crucibles 2 can be realized, the uniform filling of the resistance material is facilitated, the effective space inside the furnace body 1 is more fully utilized, and the filling amount is further improved.

[0041] Comparative example

[0042] The same negative electrode material and filling mode are adopted to test the filling amount of the traditional round crucible and the square crucible in the embodiment 1, and the test results are as follows:

[0043] Table 1

[0044]

[0045]

[0046] According to the comparison in Table 1, under the condition that the number of furnaces is the same and the model is similar, the negative electrode powder filling amount in the square crucible in the embodiment 1 is about 20% higher than that in the traditional round crucible. It can be seen that the square crucible can better adapt to the shape of the furnace body, effectively utilize the effective space in the furnace, improve the filling amount of the negative electrode material, and can be used multiple times, and has good durability.

Claims

1. A graphitization furnace for artificial graphite negative electrode material, comprising a furnace body (1), characterized in that: Also include a plurality of square crucible (2); a plurality of said square crucible (2) is distributed in the interior of the furnace body (1) in a matrix; the same row of a plurality of said square crucible (2) is connected in series by the first connecting assembly (3); the same column of a plurality of said square crucible (2) is connected by the second connecting assembly (4); the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly (3) and the second connecting assembly (4) are clamped; 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the first connecting assembly (3) and the second connecting assembly (4) are clamped; the first connecting assembly 2. The artificial graphite negative electrode material graphitization furnace according to claim 1, characterized in that: ​ 3. The artificial graphite negative electrode material graphitization furnace according to claim 1 or 2, characterized by: ​ 4. The artificial graphite negative electrode material graphitization furnace according to claim 3, characterized by: ​ 5. The graphitization furnace for artificial graphite negative materials according to claim 4, characterized in that: ​ 6. The graphitization furnace for artificial graphite negative materials according to claim 5, characterized in that: ​ 7. The artificial graphite negative electrode material graphitization furnace according to claim 6, characterized in that: ​

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