Graphitization furnace

Abstract

The utility model provides a graphitization furnace. The graphitization furnace comprises a box body and a plurality of carbon plates spliced in the box body, one end of each carbon plate is provided with a plug, the other end of each carbon plate is provided with a first slot, the plugs form dovetail grooves in the two sides of the carbon plates in the thickness direction, the two side edges, forming the first slots, of the carbon plates are clamping edges matched with the dovetail grooves, and the clamping edges are matched with the dovetail grooves. The plugs of the two carbon plates are in butt joint, the dovetail grooves in the same sides of the two carbon plates are connected with the clamping edges of the other carbon plate in an inserted mode at the same time, every four carbon plates define a rhombic unit, a plurality of rhombic units are spliced to form a material box, and a product material is arranged in each rhombic unit. The plurality of material boxes are spliced to form a diamond shape in the graphitization furnace, so that the current direction is perpendicular to the diagonal direction of the material boxes, a heat source is concentrated, the current can flow through all the side plates, and the problems that heating in a box-type furnace is not uniform, and the product quality is lower than that of a crucible furnace can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery negative electrode material processing, in particular to a graphitization furnace. Background Art

[0002] New energy battery materials are mainly divided into negative electrode materials and positive electrode materials. The graphitization process of negative electrode material production is the core link, which directly determines the quality and production cost of related negative electrode products. At present, the graphitization furnaces for negative electrode material production include Acheson furnace, inner series furnace, box furnace, etc. Among them, the Acheson graphitization furnace uses resistance material for heating, which has the advantages of uniform heating and high quality of output materials, but it also has the disadvantages of small loading amount and high unit energy consumption. The box-type graphitization furnace is the mainstream development direction of lithium battery negative electrode materials at present. It sets a rectangular material box in the box body, places the product material in the material box, and heats the product material through the material box. The biggest advantage of the box-type graphitization furnace is that the amount of material that can be loaded at a time is increased, and the unit energy consumption is lower than that of the Acheson furnace (crucible furnace), but it also has the disadvantage of uneven heating temperature.

[0003] Existing material box structures, such as a box-type graphitization furnace material box structure disclosed in the existing patent publication number CN116086189A, use vertical carbon columns as fulcrums to embed the carbon plates that make up the material box into the slots of the columns to form a rectangle. The long side of the rectangle is parallel to the direction of current, and the long side serves as a heating plate to heat the product material, while the short side is perpendicular to the direction of current. This rectangular material box has less electric heat distribution, which makes the temperature of the product material uneven, affecting the quality of the product material. Utility Model Content

[0004] The utility model aims to provide a graphitization furnace, optimize the material box structure, and solve the problems of large plate consumption, poor product temperature uniformity, and low quality.

[0005] The technical solution of the utility model is: a graphitization furnace, comprising a box body, a plurality of carbon plates spliced ​​in the box body, a plug is provided at one end of the carbon plate, and a first slot is provided at the other end, the plug forms dovetail grooves on both sides of the thickness direction of the carbon plate, the two side edges of the carbon plate forming the first slot are snap-fit ​​edges adapted to the dovetail grooves, the plugs of the two carbon plates are butt-jointed, the dovetail grooves on the same side of the two carbon plates are simultaneously plugged with the snap-fit ​​edges of another carbon plate, every four carbon plates are enclosed to form a rhombus unit, a plurality of the rhombus units are spliced ​​to form a material box, and each of the rhombus units is provided with product material.

[0006] Preferably, an expansion strip is provided between the two butted plugs.

[0007] Preferably, the width of the dovetail groove is greater than the width of the clamping edge.

[0008] Preferably, the graphitization furnace also includes an end block docked with the plug on the carbon plate at the end of the material box and a locking block simultaneously inserted between the plug on the end carbon plate and the end block, the end block has the same shape as the plug, a second slot is provided on one side of the locking block, and the first slot and the second slot have the same shape.

[0009] Preferably, an expansion strip is provided between the plug and the end block.

[0010] Preferably, a plurality of the carbon plates are stacked in the height direction of the box.

[0011] Preferably, the box body includes two first side walls arranged opposite to each other and two second side walls connected to both ends of the two first side walls, a resistance material is arranged between the first side wall and the material box, and a heat-insulating material is arranged between the second side wall and the material box.

[0012] Preferably, the top cover of the material box is provided with a cover plate.

[0013] Compared with the related art, the beneficial effects of the utility model are:

[0014] 1. After multiple material boxes are spliced ​​together, they are in a diamond shape in the graphitization furnace, so that the direction of the current is perpendicular to the diagonal direction of the material box, the heat source is concentrated and the current can flow through all side plates, which can solve the problem of uneven heating in the box furnace and lower product quality than the crucible furnace;

[0015] 2. The carbon plate is spliced ​​with a dovetail groove structure, which can reduce the volume of the plate and the breakage rate during use, saving production costs;

[0016] 3. Plugs and slots are arranged at both ends of the carbon plate. The carbon plate is plugged into the slot and plug of another carbon plate through its own plug and slot, without the need for columns, thus saving plate materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of the graphitization furnace provided by the utility model;

[0018] Figure 2 A schematic diagram of the planar structure of the graphitization furnace provided by the utility model;

[0019] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0020] Figure 4 Schematic diagram of current direction.

[0021] In the accompanying drawings: 1. box body; 11. first side wall; 12. second side wall; 13. power connector; 2. carbon plate; 21. plug; 22. first slot; 23. dovetail groove; 24. snap-on edge; 3. diamond unit; 4. material box; 5. end block; 6. locking block; 61. second slot; 7. product material; 8. resistor material; 9. thermal insulation material; 10. expansion strip; 101. cover plate. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0023] like Figure 1 , Figure 2 As shown, a graphitization furnace provided in this embodiment includes a box body 1, a carbon plate 2, a diamond unit 3, a material box 4, an end block 5, a locking block 6, a product material 7, a resistor material 8, a heat insulation material 9 and an expansion strip 10.

[0024] The box body 1 includes two first side walls 11 arranged opposite to each other and two second side walls 12 connected to both ends of the two first side walls 11 . A power connector 13 is provided on the first side wall 11 , and the power connector 13 is used to connect current to the box body 1 .

[0025] like Figure 3 As shown, a plug 21 is provided at one end of the carbon plate 2, and a first slot 22 is provided at the other end. The plug 21 forms dovetail grooves 23 on both sides of the thickness direction of the carbon plate 2, and the two sides of the carbon plate 2 forming the first slot 22 are clamping edges 24 adapted to the dovetail grooves 23. That is, the carbon plates 2 are connected by a dovetail structure (wedge-shaped structure).

[0026] like Figure 2 , Figure 3 As shown, the plug 21 on the carbon plate 2 at the end of the material box 4 is connected to the end block 5 and the locking block 6 is inserted between the plug 21 on the end carbon plate 2 and the end block 5. The end block 5 has the same shape as the plug 21, and a second slot 61 is provided on one side of the locking block 6. The first slot 22 has the same shape as the second slot 61. The two carbon plates 2 at the end of the material box 4 are locked by the end block 5 and the locking block 6. The height of the end block 5 and the locking block 6 is consistent with the height of the carbon plate 2.

[0027] like Figure 2 , Figure 3As shown, the plugs 21 of the two carbon plates 2 are butted, and the dovetail grooves 23 on the same side of the two carbon plates 2 are simultaneously plugged with the clamping edge 24 of another carbon plate 2, and every four carbon plates 2 are enclosed to form a diamond unit 3, and a plurality of the diamond units 3 are spliced ​​to form a material box 4. Figure 2 As shown, each of the rhombus-shaped units 3 is provided with product material 7. A resistance material 8 is provided between the first side wall 11 and the material box 4, and a heat-insulating material 9 is provided between the second side wall 12 and the material box 4.

[0028] like Figure 3 As shown, an expansion strip 10 is provided between the two butted plugs 21. An expansion strip 10 is provided between the plug 21 and the end block 5. The expansion strip 10 can increase the free distance of expansion and contraction of the carbon plate 2. The width W1 of the dovetail groove 23 is greater than the width W2 of the clamping edge 24.

[0029] like Figure 1 As shown, the carbon plates 2 are stacked in a plurality in the height direction of the box body 1. Figure 4 As shown, the current direction Q is perpendicular to the diagonal of the diamond unit 3. During production, the current flows from the electrode through the resistor material 8 through all the carbon plates 2, so that the material box 4 obtains electric heat and heats the product material 7 located in the diamond unit 3. The side of the material box 4 is insulated by the insulation material 9 to prevent heat loss. The top of the material box 4 is covered with a cover plate 101. There are multiple cover plates 101, one for every two diamond units 3.

[0030] The heat-insulating material 9 and the resistor material 8 are both made of carbon powder, and the carbon powder particles of the resistor material 8 are slightly coarser.

[0031] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A graphitization furnace, comprising a box, characterized in that: It also includes multiple carbon plates spliced ​​in the box body, one end of the carbon plate is provided with a plug, and the other end is provided with a first slot, the plug forms a dovetail groove on both sides of the carbon plate in the thickness direction, the two side edges of the carbon plate forming the first slot are snap-fit ​​edges adapted to the dovetail groove, the plugs of the two carbon plates are butt-jointed, the dovetail grooves on the same side of the two carbon plates are simultaneously plugged with the snap-fit ​​edges of another carbon plate, every four carbon plates are enclosed to form a diamond unit, and multiple diamond units are spliced ​​to form a material box, and each diamond unit is provided with product material.

2. The graphitization furnace according to claim 1, characterized in that: An expansion strip is provided between the two butted plugs.

3. The graphitization furnace according to claim 1, characterized in that: The width of the dovetail groove is greater than the width of the clamping edge.

4. The graphitization furnace according to claim 1, characterized in that: It also includes an end block docked with the plug on the carbon plate at the end of the material box and a locking block simultaneously inserted between the plug on the end carbon plate and the end block. The end block has the same shape as the plug, and a second slot is provided on one side of the locking block. The first slot and the second slot have the same shape.

5. The graphitization furnace according to claim 4, characterized in that: An expansion strip is provided between the plug and the end block.

6. The graphitization furnace according to claim 1, characterized in that: A plurality of carbon plates are stacked in the height direction of the box.

7. The graphitization furnace according to claim 1, characterized in that: The box body includes two first side walls arranged opposite to each other and two second side walls connected to both ends of the two first side walls. Resistance material is arranged between the first side wall and the material box, and insulation material is arranged between the second side wall and the material box.

8. The graphitization furnace according to claim 1, characterized in that: The top cover of the material box is provided with a cover plate.

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