Graphite sagger

Abstract

The graphite sagger comprises a bottom plate and side plates arranged on the bottom plate, a containing cavity is defined by the side plates, a reinforcing plate is arranged in the containing cavity, a side discharging opening is formed in the top end of each side plate, a limiting piece is arranged on the bottom face of the bottom plate, and the limiting pieces are used for stretching into the containing cavity when the graphite saggers are stacked. The graphite saggar disclosed by the utility model has higher overall strength, is not easy to damage due to collision in the use process, and can realize the limiting between the upper-layer graphite saggar and the lower-layer graphite saggar in the stacking process, so that the upper-layer graphite saggar is prevented from sliding off, and the service life of the upper-layer graphite saggar is prolonged. In addition, in the sintering process, a gap is reserved between the upper-layer graphite sagger limiting piece and the inner wall of the lower-layer graphite sagger, normal use is prevented from being affected by thermal expansion of the graphite sagger, and normal operation of equipment is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, specifically relating to a graphite sagger. Background Technology

[0002] With the continuous improvement of the manufacturing process of positive and negative electrode materials for lithium batteries, the current trend is towards large production capacity and low unit energy consumption. Graphite saggers are an important component in the manufacturing process of positive and negative electrode materials. The production process of positive and negative electrode materials generally adopts the high-temperature sintering method, and graphite saggers have the characteristics of high purity, high temperature resistance, oxidation resistance and long service life, and are widely used in the production of positive and negative electrode materials for lithium batteries.

[0003] In the prior art, patent application CN218410741U describes a sagger with a ventilation component on its side wall. During the sintering process after the sagger is filled with powder, the powder is sprayed into the furnace through the ventilation component. Over time, a large amount of dust accumulates at the bottom of the furnace, affecting the normal sintering of the material. Patent application CN218380494U describes a sagger with corrugated heat dissipation grooves on all five sides. This type of sagger cannot be used in mass-produced roller furnaces because the corrugated heat dissipation grooves are easily damaged by impact during transport, leading to furnace arching and affecting the normal operation of the equipment.

[0004] Therefore, how to improve the strength of graphite saggers, reduce their damage during use, and ensure their normal operation are issues that need to be further addressed.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide a graphite sagger that has high overall strength, long service life, and is not easily damaged by impact.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A graphite sagger includes a base plate and side plates disposed on the base plate. The side plates form a receiving cavity, and a reinforcing plate is disposed in the receiving cavity. A side outlet is disposed at the top of the side plates, and a limiting member is disposed on the bottom surface of the base plate. The limiting member is used to extend into the receiving cavity when stacking graphite saggers.

[0009] In one or more embodiments of this utility model, the reinforcing plate is arranged in a cross shape.

[0010] In one or more embodiments of this utility model, the height of the reinforcing plate is lower than that of the side drain.

[0011] In one or more embodiments of this utility model, the height of the limiting member is 3mm to 4mm.

[0012] In one or more embodiments of this utility model, the limiting member is a limiting block located at the center of the bottom surface of the base plate, and the distance between the side of the limiting block and the vertical plane containing the inner wall of the opposite side plate is 3mm to 5mm.

[0013] In one or more embodiments of this utility model, a protective corner is provided at the bottom corner where the base plate and the side plate are connected, and the outer peripheral surface of the protective corner is arc-shaped.

[0014] In one or more embodiments of this utility model, the top surface of the protective corner is an inclined surface extending towards the top of the side plate.

[0015] In one or more embodiments of this utility model, the height of the protective angle is 30mm to 40mm.

[0016] In one or more embodiments of this utility model, the base plate, side plate, reinforcing plate and limiting member are integrally formed.

[0017] Compared with existing technologies, the graphite sagger of this invention has high overall strength. During powder sintering, exhaust gas can be smoothly discharged from the powder, effectively ensuring the sintering effect. Furthermore, the graphite saggers are stacked and positioned using limiting components to prevent the upper graphite saggers from slipping, ensuring normal use of the graphite saggers and normal operation of the equipment during the sintering process. The graphite sagger of this invention is suitable for sintering lithium battery cathode materials (such as lithium iron phosphate) and anode materials (such as artificial graphite and silicon-carbon anodes) under nitrogen or other inert atmospheres. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the graphite sagger in Embodiment 1 of this utility model;

[0020] Figure 2 This is a top view of the graphite sagger in Embodiment 1 of this utility model;

[0021] Figure 3This is a side view of the graphite sagger in Embodiment 1 of this utility model;

[0022] Figure 4 This is a bottom view of the graphite sagger in Embodiment 1 of this utility model;

[0023] Figure 5 This is a schematic diagram of the stacking of graphite saggers in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 6 This is a schematic diagram of the stacking of graphite saggers in Embodiment 1 of this utility model. Figure 2 .

[0025] Explanation of key figure labels:

[0026] 1. Base plate; 2. Side plate; 21. Side outlet; 3. Receiving cavity; 4. Reinforcing plate; 5. Protective corner; 51. Sloping surface; 6. Limiting component. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] like Figure 1 and Figure 2 As shown, the graphite crucible includes a square base plate 1 and four side plates 2 disposed on the base plate 1. The four side plates 2 and the base plate 1 form a receiving cavity 3 for filling powder.

[0029] A cross-shaped reinforcing plate 4 is provided on the base plate 1, which is connected to the side plate 2. This reinforcing plate 4 improves the overall strength of the graphite sagger and also serves to conduct and dissipate heat from the high-temperature powder inside the receiving cavity 3, accelerating the cooling of the powder. A side exhaust port 21 is provided at the top of the side plate 2. During the powder sintering process, exhaust gas can be smoothly discharged from the powder through the side exhaust port 21, maintaining the pressure balance inside and outside the graphite sagger and improving sintering uniformity. Simultaneously, the height of the reinforcing plate 4 is lower than the side exhaust port 21 to facilitate subsequent machining of the side exhaust port 21.

[0030] Furthermore, during sintering, to improve kiln utilization, graphite saggers are often stacked and placed in rows. Existing graphite saggers typically have right angles at their base. When the base angle is right angle, adjacent graphite saggers are prone to jamming and cannot move normally, and stress concentration can also occur, leading to damage from collisions during use. In this invention, a protective corner 5 is provided at the base corner where the base plate 1 and side plate 2 connect. The outer circumference of the protective corner 5 is arc-shaped, and the height of the protective corner 5 is 30mm. Of course, in other embodiments, the height of the protective corner 5 can be specifically chosen as 34mm, 35mm, 37mm, or 40mm. The presence of the protective corner 5 not only strengthens the graphite saggers and extends their service life, avoiding stress concentration, but also creates gaps between adjacent graphite saggers, facilitating heat transfer and shortening cooling time when subsequent cooling of the graphite saggers is required.

[0031] Reference Figure 3 The top surface of the protective corner 5 is an inclined surface 51 extending towards the top of the side plate 2. The inclined surface 51 is beneficial for demolding and can also reduce stress concentration and reduce the possibility of edge damage.

[0032] Reference Figure 3 and Figure 4 A limiting member 6 is provided at the center of the bottom surface of the base plate 1. The limiting member 6 is a square limiting block with rounded corners to reduce the possibility of damage due to impact. The height of the limiting block is 3mm. In other embodiments, the height of the limiting block can also be 3.5mm or 4mm. When graphite saggers are stacked, the limiting block of the upper graphite sagger can be inserted into the receiving cavity 3 of the lower graphite sagger to limit the stacking and prevent the upper graphite sagger from slipping, thus avoiding affecting the normal operation of the equipment.

[0033] Furthermore, such as Figure 5 As shown, the distance between the limiting block and the vertical plane containing the inner wall of the opposite side plate 2 is 4mm. That is, when the graphite saggers are stacked, when the center line of the upper graphite sagger coincides with the center line of the lower graphite sagger, a 4mm gap is left between the limiting block of the upper graphite sagger and the inner wall of the lower graphite sagger; or, as... Figure 6 As shown, the length and width of the internal cavity 3 of the graphite sagger are both A, and the length and width of the limiting block are both B, then A = B + 4mm. On the one hand, the 4mm gap facilitates the stacking of graphite saggers by automated stacking equipment. On the other hand, during the sintering process, the graphite sagger itself undergoes a certain degree of thermal expansion; the 4mm gap allows for this expansion, reducing damage caused by expansion and compression during stacking. Of course, in other embodiments, the distance between the limiting block and the vertical plane containing the inner wall of the opposite side plate 2 can also be 3mm or 5mm.

[0034] In addition, in the vertical direction, the height of the limiting block is less than the depth of the side exhaust port 21, so that when stacking graphite crucibles, the limiting block will not block the side exhaust port 21 in the horizontal direction, so that the two opposite side exhaust ports 21 in the horizontal direction can be connected, which is conducive to better exhaust of exhaust gas.

[0035] Furthermore, the bottom plate 1, side plate 2, reinforcing plate 4, protective corner 5, and limiting component 6 of the graphite sagger are integrally molded, eliminating the need for splicing and assembly, thus reducing manufacturing costs and enhancing the overall strength of the graphite sagger.

[0036] The manufacturing process of the graphite sagger in this embodiment includes: raw material mixing, mixing raw materials such as reinforced graphite-based composite materials, pure water, and binders; molding, placing the mixed raw materials in a molding mold, which consists of a male mold and a female mold, pressing and demolding to obtain a sagger blank; low-temperature drying, drying the sagger blank in an oven to remove moisture; high-temperature firing, firing the dried sagger blank in a vacuum furnace; and shape finishing, using a CNC machine tool to finish the shape and dimensions of the vacuum-fired sagger to obtain the graphite sagger.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A graphite retort, characterized by, The graphite box is characterized by comprising a bottom plate and side plates arranged on the bottom plate, the side plates surrounding a containing cavity, a reinforcing plate arranged in the containing cavity, a side discharge opening arranged at the top end of the side plates, and a limiting piece arranged on the bottom surface of the bottom plate and extending into the containing cavity when the graphite boxes are stacked.

2. The graphite retort according to claim 1, wherein The reinforcing plate is arranged in a cross shape.

3. The graphite retort according to claim 1, wherein The height of the reinforcing plate is lower than that of the side discharge opening.

4. The graphite retort according to claim 1, wherein The height of the limiting piece is 3-4 mm.

5. The graphite retort according to claim 1, wherein The limiting piece is a limiting block arranged at the center of the bottom surface of the bottom plate, and the distance between the side surface of the limiting block and the vertical plane in which the inner wall of the opposite side plate is arranged is 3-5 mm.

6. The graphite retort according to claim 1, wherein A protective corner is arranged at the bottom corner where the bottom plate and the side plate are connected, and the outer peripheral surface of the protective corner is in an arc shape.

7. The graphite retort according to claim 6, wherein The top surface of the protective corner is an inclined surface extending to the top end of the side plate.

8. The graphite retort according to claim 6, wherein The height of the protective corner is 30-40 mm.

9. The graphite retort according to claim 1, wherein The bottom plate, the side plates, the reinforcing plate and the limiting piece are integrally formed.

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