Novel graphite sagger

Abstract

The invention discloses a novel graphite sagger which comprises a graphite sagger body of a box structure with a cavity, four vertical triangular prisms located at the four corners in the graphite sagger body correspondingly, and a cross-shaped partition plate with the outer side face and the bottom face fixedly abutting against the graphite sagger. The two side faces of each triangular prism are seamlessly attached to the two side faces of the inner corner of each graphite sagger body, a plurality of blind holes are formed in the two side faces of each triangular prism respectively, and the triangular prisms are fastened to the graphite sagger bodies through the blind holes. By means of the main structural design, the problems that an existing graphite sagger is high in cost, complex in machining / assembling, concentrated in stress, uneven in heat dissipation, powder moving and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of battery electrode material sintering, in particular to a novel graphite sagger. Background Art

[0002] The cathode material of lithium iron phosphate batteries is a crucial component of these batteries. Currently, high-temperature sintering is the most common method used in the production of these materials. Saggers are the most widely used container for mass production of these materials. Graphite saggers are widely used for sintering powder materials such as lithium iron phosphate and graphite due to their excellent corrosion resistance, thermal conductivity, high-temperature resistance, and mechanical properties.

[0003] At present, there are generally two types of graphite saggers on the market. One is the hollowed sagger, which uses isostatically pressed high-purity graphite blocks as raw materials. The core material is hollowed out by a hollowing process and then mechanically processed into a sagger. The raw material utilization rate of the graphite sagger production process is extremely low (less than 20%), which produces a large amount of waste, and the production capacity is severely restricted by the high-purity graphite raw materials, which cannot meet the demand brought about by the explosive growth of the new energy industry in recent years; the other is the sagger prepared by using graphite powder and petroleum coke as the main raw materials, applying high pressure molding in a mold, and then high-temperature carbonization. This type of sagger production equipment requires large investment, low production efficiency, and low yield. In addition, since the material formed by this method has large thermal stress at high temperature, the flexural strength, fracture strength and other indicators are reduced. Therefore, in actual use, its service life is relatively low.

[0004] There is also a combined graphite sack, which is composed of a bottom plate with a slot, two C-shaped baffles, and two horizontal baffles. This graphite sack solves the problems of low graphite utilization, complex processing, and high cost in the excavated sack. However, the graphite utilization rate of this combined structure is limited, the combined structure is relatively complex, and the processing is difficult, so the cost reduction is also limited. In addition, it does not solve the problem of stress concentration at the corners and joints of the C-shaped plates. In addition, the prior art also discloses other splicing structures, but for splicing structures made of graphite, the stress concentration problem at the splicing parts has not been effectively solved.

[0005] Therefore, developing a low-cost and high-performance combined graphite cask has become one of the problems to be solved urgently by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of high cost, complicated processing / assembly, stress concentration and heat dissipation of existing graphite saggers. The above technical objectives of the present invention are achieved through the following technical solutions: A novel graphite sagger comprises a graphite sagger body with a box structure having a cavity, four vertical triangular prisms respectively located at the four corners of the graphite sagger body, and a cross-shaped partition whose outer side and bottom surfaces are respectively abutted and fixed to the graphite sagger body; the two side surfaces of each triangular prism are seamlessly and tightly attached to the two side surfaces of the inner corner of each graphite sagger body, and a plurality of blind holes are respectively provided on the two side surfaces of the triangular prism, and the triangular prism is fastened to the graphite sagger body through the plurality of blind holes.

[0007] Preferably, the graphite sagger body is formed by a bottom plate and four side plates and is fixed without screws.

[0008] Preferably, the periphery of the bottom plate and the lower edge of the inner wall of each side plate are respectively embedded in the installation.

[0009] Preferably, the upper surface of the bottom plate is a step structure, and the lower edge of the inner wall of the side plate is provided with an inner blind groove along the transverse direction.

[0010] Preferably, the joints between any two adjacent side panels are connected by snap fasteners.

[0011] Preferably, the cross-shaped partition includes a first partition and a second partition that are relatively plugged in.

[0012] Preferably, a first plug-in slot is provided at the bottom of the first partition, and a second plug-in slot is provided at the top of the second partition, and the first plug-in slot and the second plug-in slot are plugged in relative to each other.

[0013] Preferably, the upper surface of the triangular prism is lower than the upper surface of the adjacent graphite sagger body, and the lower surface of the triangular prism is higher than the lower bottom surface of the adjacent graphite sagger body.

[0014] Preferably, each outer side surface and each bottom surface of the cross-shaped partition is provided with two connecting holes, and the two connecting holes on the outer side surface are spaced apart and distributed in the middle of the outer side surface.

[0015] Preferably, the outer corners of the bottom plate are all provided with corners, and the outer edges of the corners are rounded.

[0016] Compared with the existing technology, this technical solution has the following advantages.

[0017] 1- In the existing technology, the reinforcing ribs are generally square columns, and their threaded holes are through holes, which may cause powder loss during production. The reinforcing ribs of this technical solution are triangular columns, and the threaded holes are blind holes, which avoids the risk of powder loss.

[0018] 2- In the prior art, various square columns or protrusions are generally added to the bottom of the graphite crucible to strengthen the connection between the bottom plate and the side plates. However, this solution cannot solve the problem of powder loss during part production and will further reduce the capacity of the cavity inside the graphite crucible. The triangular columns of this technical solution and the embedded structural design of the bottom plate and side plates in the graphite crucible do not require screws to connect. This not only solves the problem of connection strength between the bottom plate and side plates, but also solves the problem of powder loss, improves sealing, and also increases the capacity of the cavity inside the graphite crucible by reducing the number of reinforcing ribs.

[0019] 3- In the existing technology, the middle powder of the partition is unevenly heated in the early stage, the powder near the periphery is well heated, and the middle powder is poorly heated. In this technology, a cross-shaped partition is used in the graphite sagger, so that the middle powder of the graphite sagger is well heated, the heating time of the heating equipment is short, the electricity cost is reduced, and the profit and work efficiency are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective view of the present invention.

[0021] Figure 2 It is a three-dimensional exploded view of the present invention.

[0022] Figure 3 It is a three-dimensional view of the side panel of the present invention.

[0023] Figure 4 for Figure 2 An enlarged view of part A of the midsole plate.

[0024] Figure 5 This is an exploded view of the connection between the first and second partitions of the present invention. DETAILED DESCRIPTION

[0025] As attached Figure 1-5 As shown, a new type of graphite crucible includes a graphite crucible body 1 with a box structure having a cavity, four vertical triangles 3 located at the four corners of the graphite crucible body 1, and a cross-shaped partition 2 whose outer side and bottom surfaces are respectively abutted and fixed to the graphite crucible body 1; the two side surfaces of each triangular prism 3 are seamlessly and tightly attached to the two side surfaces of the inner corner of each graphite crucible body 1, and a plurality of blind holes 31 are respectively provided on the two side surfaces of the triangular prism 3, through which the triangular prism 3 is fastened to the graphite crucible body 1. The beneficial effect of this embodiment is that, through the reinforcing ribs of the triangular prism 3, the side panels 12 of the graphite crucible body can be connected into a whole and fastened at the four corners, thereby increasing the strength of the entire graphite crucible body; at the same time, the design of the blind holes 31 on the triangular prism 3 avoids the risk of powder leakage.

[0026] The blind holes 31 on the two sides of the triangular prism 3 are respectively fastened to the connection holes 121 on the side panels 12 on both sides thereof by screws, thereby achieving the effect of fastening two side panels by one triangular prism 3. In the prior art, the reinforcing ribs with the same function as the triangular prism 3 are generally square prisms, and their threaded holes are through holes, which are prone to powder loss during production. Then, the bottom plate 11 and the side panels 13 on all sides are connected to form a whole through the cross-shaped partition 2. This function is to further strengthen the strength of the entire graphite crucible body 1, and also to make the middle powder of the graphite crucible body 1 well heated, the heating time of the heating equipment is short, the electricity cost is reduced, the profit and work efficiency are increased, and the problem of uneven heating of the middle powder in the initial stage of heating, good heating of the powder near the four sides, and poor heating of the middle powder in the prior art is solved.

[0027] As one preferred embodiment, the graphite crucible body 1 is enclosed by a bottom plate 11 and four side plates 12, and is fixed without screws. The screwless fixing method is used to avoid the risk of powder leakage caused by the screw holes and reduce the difficulty of assembly during the manufacturing process.

[0028] There are many ways to fix the bottom plate 11 and the four side plates 12 without screws, such as the following Figure 2-4 One embodiment is shown, in which the periphery of the base plate 11 is embedded in the lower edge of the inner wall of each side plate 12. For detailed design details, refer to Figures 3-4. The upper surface of the base plate 11 is a stepped structure, comprising at least an uppermost internal step 112 and an outer step 111 located directly below it. The surface area of ​​the inner step 112 is larger than that of the outer step 111. The lower edge of the inner wall of the side plate 12 is provided with a transverse inner blind groove 123. The inner step 112 of the base plate 11 is embedded in the inner blind groove 123 of the side plate 12, eliminating the need for screws and reinforcing ribs, maintaining good strength and sealing, and preventing powder loss.

[0029] In addition, as a common embodiment, the four side panels 12 are completely identical, which is convenient for production and assembly. That is, the bottom panel 11 and the four side panels 12 enclose a rectangular box body with a cavity.

[0030] As one of the implementation schemes, Figure 1-3 The joints of any two adjacent side panels 12 are connected by snap fasteners. On both sides of the side panels 12, one side is provided with a raised end 124b, and the other opposite end is provided with a groove end 124a. One side of each side panel 12 and one side of the adjacent side panel form a snap fastener connection structure through the raised end 124b and the groove end 124a.

[0031] In one embodiment, the cross-shaped partition 2 includes a first partition 21 and a second partition 22 that are inserted relative to each other. The first partition 21 and the second partition 22 can be integrally formed or can be two independent parts inserted together. This advantageously solves the problem of uneven heating of the powder in the middle and around the edges during the initial heating process in the prior art.

[0032] When the first partition 21 and the second partition 22 are independent parts, the first partition 21 has a first insertion groove 211 at the bottom, and the second partition 22 has a second insertion groove 221 at the top. The first insertion groove 211 and the second insertion groove 221 are relatively plugged in.

[0033] As one embodiment, the upper surface of the triangular prism 3 is lower than the upper surface of the adjacent graphite saggar body 1, and the lower surface of the triangular prism 3 is higher than the lower bottom surface of the adjacent graphite saggar body 1. The beneficial effect of this embodiment is that the cavity capacity is increased as much as possible while ensuring the overall strength of the graphite saggar body 1.

[0034] As one of the implementation schemes, Figure 5 As shown, each outer side surface and each bottom surface of the cross-shaped partition 2 are provided with two connection holes. The two connection holes (212, 222) on each outer side surface are respectively connected and fastened with the connection holes 122 on the corresponding side plate by screws, and the two connection holes on each bottom surface are respectively connected and fastened with the two connection holes 113 on the bottom plate 11 by screws. The two connection holes (212, 222) are spaced apart in the middle of the corresponding outer side surface. The logic of this design is that the reinforcement part of the partition end surface can be omitted. The requirement is that the screws must be in the middle of the plate thickness to maximize the reinforcement effect. If the two connection holes (212, 222) are spaced apart at the two ends of their corresponding outer side surface, their reinforcement effect will be weakened, and it is necessary to add a design reinforcement part at each end of the cross-shaped partition 2.

[0035] As one embodiment, the four outer corners of the bottom plate are provided with corners 125, and the outer edges of the corners 125 are rounded. The corners 125 can be added later or formed simultaneously with the side plates 12. On the one hand, the corners 125 can further enhance the mechanical properties of the connection parts and ensure the stability of the graphite crucible body 1. More importantly, the corners 125 can act as a limiter to ensure that two adjacent graphite crucible bodies 1 are separated by a certain distance during use, which is beneficial for the clamping of the robot arm and also for the uniform heating of the battery positive electrode material.

[0036] In the prior art, various square columns or protrusions are generally added to the bottom of the graphite saggar body 1 to increase the strength of the connection between the bottom plate 11 and the side plates 12. However, this solution cannot solve the problem of powder loss during production of parts, and will further reduce the capacity of the inner cavity of the graphite saggar body 1. The triangular prism 3 of the present technical solution and the embedded structural design of the bottom plate 11 and the side plates 12 in the graphite saggar body 1 do not require screw connection, which not only solves the problem of connection strength between the bottom plate 11 and the side plates 12, but also solves the problem of powder loss, and has good sealing performance. At the same time, the capacity of the inner cavity of the graphite saggar is increased by reducing the number of reinforcing ribs such as the triangular prism 3.

Claims

1. A new type of graphite sagger, characterized in that, It includes a graphite saggar main body with a box structure with a cavity, four vertical triangular prisms located at the four corners of the graphite saggar main body, and a cross-shaped partition whose outer side and bottom surfaces are respectively abutted and fixed to the graphite saggar; the two side surfaces of each triangular prism are seamlessly and tightly attached to the two side surfaces of the inner corner of each graphite saggar main body, and a number of blind holes are respectively provided on the two side surfaces of the triangular prism, and the triangular prism is fastened to the graphite saggar main body through the several blind holes.

2. A new type of graphite sagger according to claim 1, characterized in that, The graphite sagger body is formed by a bottom plate and four side plates and is fixed without screws.

3. A novel graphite crucible according to claim 2, characterized in that: The periphery of the bottom plate and the lower edge of the inner wall of each side plate are respectively embedded and installed.

4. A new type of graphite sagger according to claim 3, characterized in that: The upper surface of the bottom plate is a step structure, and the lower edge of the inner wall of the side plate is provided with an inner blind groove along the transverse direction.

5. A novel graphite crucible according to claim 2, characterized in that: The joints of any two adjacent side panels are connected by snap fasteners.

6. A novel graphite sagger according to claim 1, characterized in that: The cross-shaped partition includes a first partition and a second partition that are inserted into each other relative to each other.

7. A novel graphite crucible according to claim 6, characterized in that: A first plug-in slot is provided at the bottom of the first partition, and a second plug-in slot is provided at the top of the second partition. The first plug-in slot and the second plug-in slot are plugged in relative to each other.

8. A novel graphite crucible according to claim 1, characterized in that: The upper surface of the triangular prism is lower than the upper surface of the adjacent graphite saggar body, and the lower surface of the triangular prism is higher than the lower bottom surface of the adjacent graphite saggar body.

9. A novel graphite crucible according to claim 1, characterized in that: Each outer side surface and each bottom surface of the cross-shaped partition is provided with two connecting holes, and the two connecting holes on the outer side surface are spaced apart and distributed in the middle of the outer side surface.

10. The novel graphite sagger according to claim 1, characterized in that: The outer corners of the bottom plate are provided with corners, and the outer edges of the corners are rounded.

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