A graphite crucible for carbonizing negative electrode materials of lithium batteries

Abstract

The present invention relates to the technical field of graphite crucibles and discloses a graphite crucible for carbonizing negative electrode materials of lithium batteries, comprising a crucible, wherein the top of the crucible is engaged and connected with a threaded cover. Utilizing the characteristic that the temperature inside the crucible continuously rises, when the crucible generates high-pressure gas due to the high temperature, the high-pressure gas will flow to the bottom of the piston plate through the holes around the partition, forcing the piston plate to slide upward along the inner wall of the threaded cover, and drive a sliding rod and an exhaust assembly to move upward synchronously. When the sliding rod moves upward, since the rotating plate contacts the external powdered material, as the sliding rod moves upward, the powdered material in the center of the crucible will be driven by the rotating plate and move upward synchronously, while the powder around the crucible will slide downward, so that in a high-temperature closed environment, the equipment can drive the powdered raw materials to flow, thereby avoiding large differences in heating of the raw materials inside the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of graphite crucibles, in particular to a graphite crucible for carbonizing negative electrode materials of lithium batteries. Background Art

[0002] Graphite crucible is made of natural flake graphite as the main raw material and plastic refractory clay or carbon as the binder. It has the characteristics of high temperature resistance, strong thermal conductivity, good corrosion resistance and long service life. During high temperature use, the thermal expansion coefficient is small and it has certain resistance to strain in the face of rapid cooling and rapid heating. It has strong corrosion resistance to acidic and alkaline solutions, has excellent chemical stability, and does not participate in any chemical reaction during the smelting process. The negative electrode material of lithium battery is made of a mixture of negative electrode active material carbon material or non-carbon material, binder and additives. During the processing, it is usually placed in a graphite crucible for high temperature carbonization. At this time, a high temperature and high pressure heating environment will be formed inside the graphite crucible. Among them, when the outside of ordinary graphite crucible is heated, the internal temperature can reach 1400℃~1600℃, while the special stone mill crucible can reach 2000℃. At the same time as the high temperature appears, the internal gas expands due to the heat, which makes the closed graphite crucible have high pressure phenomenon. The above high pressure is usually controlled at 0.1~0.5 MPa, the maximum will not exceed 1MPa.

[0003] When heating a crucible, especially when carbonizing negative electrode materials, a high temperature of nearly 3,000 degrees Celsius is required. Therefore, a sealed crucible is often used. The crucible is filled with a large amount of powdered negative electrode material. When the crucible is heated, the material at the edge is heated first. However, the thermal conductivity of the silicon-based composite material contained in the powdered material is 2-10 W / (m·K), which is much lower than that of the other materials. This leads to large differences in the heating conditions of the raw materials. Moreover, when the temperature at the center rises to the required position, the material at the edge of the crucible may overheat. To address the above problems, the following solutions are proposed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a graphite crucible for carbonizing negative electrode materials of lithium batteries, comprising a crucible, a threaded cover being engaged with the top of the crucible, and further comprising:

[0005] The pressure mechanism is fixedly connected to the inner wall of the threaded cover and is used to receive the high pressure inside the crucible and force the pressure mechanism to slide;

[0006] A blocking mechanism is slidably connected to the inner wall of the pressure mechanism and is used to block the pipeline inside the threaded cover;

[0007] A pressure relief mechanism, which is fixedly connected to the outer wall of the pressure mechanism and is used to drive the powdered raw materials inside the crucible to circulate when the pressure mechanism slides up and down;

[0008] When high pressure appears inside the crucible, the pressure generated by the high-pressure gas will force the pressure mechanism to drive the pressure relief mechanism to slide up and down, and cause the powdered raw materials inside the crucible to flow and break up.

[0009] Preferably, the pressure mechanism comprises:

[0010] A pressure-bearing component, the pressure-bearing component is fixedly connected to the inner wall of the threaded cover through a fixing piece;

[0011] The fixed connection includes a partition fixedly connected to the inner wall of the threaded cover, and a sliding rod 1 is slidably connected to the inner wall of the through hole of the partition;

[0012] A flow assembly, the flow assembly being fixedly connected to the bottom of the threaded cover through a restriction member;

[0013] The limiting member includes a fixing block 1 fixedly connected to the bottom of the threaded cover, and the bottom of the threaded cover is fixedly connected to a fixing block 2;

[0014] When high pressure is generated inside the crucible due to high temperature, the high-pressure gas will pass through the four small holes around the partition and act on the bottom of the pressure component, forcing the pressure component to drive the sliding rod to slide upward along the through hole of the partition.

[0015] Preferably, the blocking mechanism comprises:

[0016] The second blocking component is slidably connected to the inner wall of the first fixed block via a sliding member;

[0017] The sliding member includes a sliding plate 1 slidably connected to the inner wall of the fixed block 1, and a through hole 1 is formed on the side wall of the sliding plate 1;

[0018] The blocking component 1 is slidably connected to the inner wall of the fixed block 2 through the blocking piece;

[0019] The blocking member includes a second flow groove provided on the side wall of the second fixed block, and a second sliding plate is slidably connected to the inner wall of the second fixed block;

[0020] Among them, the sliding plate 1 will block the flow component under normal conditions, limiting the outflow of gas inside the threaded cover.

[0021] Preferably, the pressure relief mechanism includes:

[0022] A flow assembly, the flow assembly being fixedly connected to the bottom of the partition through a restriction member;

[0023] The limiting member includes a trumpet tube connected to the bottom of the partition, the bottom of the trumpet tube is slidably connected to a sliding frame, and the top of the sliding frame is fixedly connected to a convex plate;

[0024] An exhaust assembly is slidably connected to the inner wall of the through hole at the top of the threaded cover through a pressure relief piece;

[0025] The pressure relief member includes a sliding block slidably connected to the inner wall of the threaded cover, a U-shaped groove is opened on the side wall of the sliding block, a round rod three is slidably connected to the inner wall of the sliding block, and a round block is fixedly connected to the top of the round rod three;

[0026] When the pressure mechanism is running, the pressure component will drive the sliding block to slide downward through the round block and the round rod, so that the high-pressure gas on the top of the pressure component is discharged outward through the U-shaped groove.

[0027] Preferably, the pressure component includes a piston plate fixedly connected to the top of the sliding rod, and the side wall of the piston plate is slidably connected to the inner wall of the threaded cover;

[0028] When the high-pressure gas flows upward through the holes in the partition plate, it acts on the bottom of the piston plate, forcing the piston plate to slide upward along the inner wall of the threaded cover.

[0029] Preferably, the flow component includes an exhaust groove 1 provided on the inner wall of the threaded cover, and a flow groove 1 is provided on the inner wall of the threaded cover;

[0030] Among them, under normal circumstances, sliding plate 1 will block exhaust groove 1, so that the high-pressure gas drives the piston plate to move upward, and sliding plate 2 will block flow groove 2, so that the high-pressure gas cannot be transmitted to the top of the piston plate through flow groove 2 and flow groove 1.

[0031] Preferably, the second blocking component includes a second sliding rod fixedly connected to the top of the first sliding plate, and the outer wall of the second sliding rod is slidably connected to the outer wall of the piston plate;

[0032] Among them, after the piston plate moves to the highest position, the top of the piston plate will contact the block at the top of the sliding rod 2. At this time, the piston plate drives the sliding plate 1 to slide upward through the sliding rod 2, so that the through hole 1 and the exhaust groove 1 form an overlapping state, and the high-pressure gas at the bottom of the piston plate is discharged outward through the through hole 1 and the exhaust groove 1.

[0033] Preferably, the first blocking component includes a second through hole formed on the second side wall of the sliding plate;

[0034] Among them, when the sliding plate 2 is pressed and moves upward, the through hole 2 and the flow groove 2 form an overlapping state. At this time, the high-pressure gas can be transmitted to the top of the piston plate through the flow groove 2 and the flow groove 1, causing the piston plate to slide downward.

[0035] Preferably, the circulation assembly includes a round rod 1 fixedly connected to the top of the convex plate, a round rod 2 fixedly connected to the bottom of the convex plate, and an outer wall of the round rod 2 fixedly connected to the bottom of the sliding plate 2;

[0036] Among them, when the high-pressure gas at the bottom of the piston plate is discharged outward through the through hole 1 and the exhaust groove 1, when the flowing gas passes through the gap between the convex plate and the inner wall of the bell tube, the pressure of the gas flow will force the convex plate to drive the sliding frame to seal the bottom of the bell tube, restricting the gas flow. At this time, the convex plate moves upward through the round rod 2 and the sliding plate 2, so that the through hole 2 and the flow groove 2 coincide with each other.

[0037] Preferably, the exhaust assembly includes a groove 1 provided on the outer wall of the bottom of the sliding rod 1, a rotating plate is rotatably connected to the inner wall of the groove 1, and a plurality of limiting blocks are fixedly connected to the outer wall of the sliding rod 1;

[0038] Among them, when the sliding rod moves downward, the rotating plate will rotate upward with the connection point as the center, and when the sliding rod moves upward, the rotating plate will rotate downward with the connection point as the center and form an angle of eighty degrees with the sliding rod.

[0039] The present invention has the following beneficial effects:

[0040] (1) The present invention utilizes the characteristic that the temperature inside the crucible is constantly rising, and a pressure mechanism and a blocking mechanism are set inside the device. When the crucible generates high-pressure gas due to high temperature, the high-pressure gas will flow to the bottom of the piston plate through the holes around the partition, forcing the piston plate to slide upward along the inner wall of the threaded cover, and drive the sliding rod 1 and the exhaust assembly to move upward synchronously. When the sliding rod 1 moves upward, the rotating plate contacts the external powdered material, which makes the rotating plate open outward and insert into the powder. As the sliding rod 1 moves upward, the powder material in the center of the crucible will move upward synchronously under the drive of the rotating plate, while the powder around the crucible will slide down, so that the device can drive the powdered raw materials to flow in a high-temperature closed environment, avoiding large differences in the heating of the raw materials inside the device.

[0041] (2) The present invention utilizes the characteristics of the piston plate sliding up and down. Before the piston plate moves down to the lowest position, the bottom of the piston plate first contacts the top of the sliding plate 2 and forces the sliding plate 2 to move down, causing the through hole 2 to be misaligned with the exhaust groove 1. Then the piston plate continues to move down. Since the gas has a certain compressibility, when the piston plate contacts the top of the round rod 1, the pressure on the top of the piston plate and the pressure on the bottom of the sliding frame belong to the same high-pressure gas. Therefore, the above two forces are equal. After the piston plate contacts the top of the round rod 1, the gas between the piston plate and the partition is compressed. This compression force will exert an additional downward pressure on the top position of the convex plate, forcing the convex plate and the sliding frame to move away from the bell tube, so that the high-pressure gas inside the crucible can pass through. Figure 7The gap in the middle G enters the bottom of the piston plate again. At this time, since the exhaust groove 1 and the through hole 1 are misaligned, the high-pressure gas inside the crucible will no longer drive the convex plate to move upward after passing through the above G position. Therefore, when the equipment is heated, it can continuously drive the sliding rod 1 to slide up and down, thereby accelerating the heating efficiency of the powdered raw materials.

[0042] (3) The present invention utilizes the characteristic of the sliding rod 1 moving up and down, and sets a rotating plate inside the device. When the sliding rod 1 moves upward, the rotating plate will rotate downward with the connection point as the center, and form an angle of 80 degrees with the sliding rod 1, thereby increasing the contact surface between the rotating plate and the powdered raw material. When the sliding rod 1 moves downward, the rotating plate will rotate upward with the connection point as the center, and force the rotating plate to present the following Figure 8 The state is such that the operation of the above components reduces the resistance encountered by the sliding rod when it moves downward.

[0043] (4) The present invention utilizes the characteristic that the top of the piston plate is filled with gas and moves downward to increase the resistance of the sliding block, sliding plate 1 and sliding plate 2 to sliding downward. When the piston plate slides downward, it will drive the round rod 3 to slide downward synchronously. When it reaches the lowest position, the round block drives the sliding block to move downward, so that the U-shaped groove and the top space of the piston plate form an interconnected state. The high-pressure gas at the top of the piston plate will be discharged outward through the U-shaped groove. Through the application of the above components, the accumulation of high-pressure gas on the top of the piston plate is avoided, which affects the sliding efficiency of the piston plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0046] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0047] Figure 3 This is an exploded schematic diagram of the overall structure of the present invention;

[0048] Figure 4 is a schematic cross-sectional view of a flow assembly of the present invention;

[0049] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point C in the middle;

[0050] Figure 6 For the present invention Figure 4A magnified schematic diagram of point A in the middle;

[0051] Figure 7 For the present invention Figure 4 A magnified schematic diagram of point B in the middle;

[0052] Figure 8 This is a schematic diagram of the working state of the pressure relief mechanism of the present invention;

[0053] Figure 9 For the present invention Figure 8 The enlarged schematic diagram of point D in the middle;

[0054] Figure 10 It is a schematic cross-sectional view of the exhaust assembly of the present invention.

[0055] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0056] In the figure: 1, pressure mechanism; 11, pressure component; 12, flow component; 13, crucible; 14, threaded cover; 111, partition; 112, sliding rod 1; 113, piston plate; 121, exhaust groove 1; 122, flow groove 1; 123, fixed block 1; 124, fixed block 2; 2, blocking mechanism; 21, blocking component 2; 22, blocking component 1; 211, sliding plate 1; 212, through hole 1; 213, sliding Rod two; 221, flow groove two; 222, sliding plate two; 223, through hole two; 3, pressure relief mechanism; 31, circulation component; 32, exhaust component; 311, trumpet tube; 312, sliding frame; 313, convex plate; 314, round rod one; 315, round rod two; 321, groove one; 322, rotating plate; 323, limiting block; 324, sliding block; 325, U-shaped groove; 326, round rod three; 327, round block. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] For example 1, please refer to Figure 1-Figure 5 The present invention is a graphite crucible for carbonizing negative electrode materials of lithium batteries, comprising a crucible 13, a threaded cover 14 being engaged with the top of the crucible 13, and further comprising:

[0059] The pressure mechanism 1 is fixedly connected to the inner wall of the threaded cover 14 and is used to receive the high pressure inside the crucible 13 and force the pressure mechanism 1 to slide;

[0060] The blocking mechanism 2 is slidably connected to the inner wall of the pressure mechanism 1 and is used to block the pipeline inside the threaded cover 14;

[0061] The pressure relief mechanism 3 is fixedly connected to the outer wall of the pressure mechanism 1 and is used to drive the powdered raw material inside the crucible 13 to circulate when the pressure mechanism 1 slides up and down;

[0062] When high pressure appears inside the crucible 13 , the pressure generated by the high-pressure gas will force the pressure mechanism 1 to drive the pressure relief mechanism 3 to slide up and down, and cause the powdered raw materials inside the crucible 13 to flow and break up.

[0063] The pressure mechanism 1 comprises:

[0064] The pressure-bearing component 11 is fixedly connected to the inner wall of the threaded cover 14 through a fixing member;

[0065] The fixed connection includes a partition 111 fixedly connected to the inner wall of the threaded cover 14, and a sliding rod 112 is slidably connected to the inner wall of the through hole of the partition 111;

[0066] The flow assembly 12 is fixedly connected to the bottom of the threaded cover 14 through a restriction member;

[0067] The limiting member includes a fixing block 123 fixedly connected to the bottom of the threaded cover 14, and a fixing block 2 124 fixedly connected to the bottom of the threaded cover 14;

[0068] When high pressure is generated inside the crucible 13 due to the high temperature, the high-pressure gas will pass through the four small holes around the partition 111 and act on the bottom of the pressure component 11, forcing the pressure component 11 to drive the sliding rod 112 to slide upward along the through hole of the partition 111;

[0069] Before use, the powdered raw material is poured into the crucible 13, and then the threaded cover 14 is screwed into the crucible 13, and the sliding rod 112 is ensured to extend into the crucible 13. Then the device is placed in the heating area, so that the crucible 13 is subjected to high temperature while the powdered material inside the crucible 13 is heated.

[0070] The blocking mechanism 2 comprises:

[0071] The second blocking component 21 is slidably connected to the inner wall of the first fixing block 123 via a sliding member;

[0072] The sliding member includes a sliding plate 211 slidably connected to the inner wall of the fixed block 123, and a through hole 212 is formed on the side wall of the sliding plate 211;

[0073] A blocking component 1 22 is slidably connected to the inner wall of the fixing block 2 124 via a blocking member;

[0074] The blocking member includes a second flow groove 221 provided on the side wall of the second fixed block 124, and a second sliding plate 222 is slidably connected to the inner wall of the second fixed block 124;

[0075] The sliding plate 1 211 will block the flow component 12 in a normal state, and restrict the gas inside the threaded cover 14 from flowing out.

[0076] The pressure relief mechanism 3 includes:

[0077] The circulation assembly 31 is fixedly connected to the bottom of the partition 111 through a restriction member;

[0078] The limiting member includes a trumpet tube 311 connected to the bottom of the partition 111, the bottom of the trumpet tube 311 is slidably connected to a sliding frame 312, and the top of the sliding frame 312 is fixedly connected to a convex plate 313;

[0079] The exhaust assembly 32 is slidably connected to the inner wall of the through hole at the top of the threaded cover 14 through a pressure relief member;

[0080] The pressure relief member includes a sliding block 324 slidably connected to the inner wall of the threaded cover 14, a U-shaped groove 325 is formed on the side wall of the sliding block 324, a round rod 326 is slidably connected to the inner wall of the sliding block 324, and a round block 327 is fixedly connected to the top of the round rod 326;

[0081] Among them, when the pressure mechanism 1 is running, the pressure component 11 will drive the sliding block 324 to slide downward through the round block 327 and the round rod 326, so that the high-pressure gas at the top of the pressure component 11 will be discharged outward through the U-shaped groove 325. When the piston plate 113 reaches the highest position, the top of the piston plate 113 will contact the top block of the sliding rod 213, forcing the sliding rod 213 and the sliding plate 1 211 to move upward synchronously, so that the through hole 1 212 coincides with the exhaust groove 1 121, and the high-pressure gas at the bottom of the piston plate 113 will be discharged outward through the through hole 1 212 and the exhaust groove 1 121. At this time, the high-pressure gas inside the crucible 13 will pass through Figure 7 The gap in the middle G reaches the bottom of the piston plate 113, and the gas at the bottom of the piston plate 113 will be discharged outward through the exhaust groove 121. At this time, the gas is in a flowing state, and the pressure of the gas flow will force the convex plate 313 to drive the sliding frame 312 to seal the bottom of the bell tube 311, restricting the gas flow and limiting the high-pressure gas from entering the bottom of the piston plate 113.

[0082] For example 2, please refer to Figure 2-Figure 10 The present invention is a graphite crucible for carbonizing negative electrode materials of lithium batteries. Based on Example 1, the pressure component 11 includes a piston plate 113 fixedly connected to the top of a sliding rod 112, and the side wall of the piston plate 113 is slidably connected to the inner wall of the threaded cover 14;

[0083] When the high-pressure gas flows upward through the holes of the partition 111, it acts on the bottom of the piston plate 113, forcing the piston plate 113 to slide upward along the inner wall of the threaded cover 14;

[0084] Taking advantage of the fact that the temperature inside the crucible 13 is constantly rising, a pressure mechanism 1 and a blocking mechanism 2 are provided inside the device. When the crucible 13 generates high-pressure gas due to the high temperature, the high-pressure gas will flow through the holes around the partition 111 to the bottom of the piston plate 113, forcing the piston plate 113 to slide upward along the inner wall of the threaded cover 14, and drive the sliding rod 112 and the exhaust assembly 32 to move upward synchronously.

[0085] The flow assembly 12 includes an exhaust groove 121 formed on the inner wall of the threaded cover 14, and a flow groove 122 formed on the inner wall of the threaded cover 14;

[0086] Among them, under normal circumstances, sliding plate 1 211 will block exhaust groove 1 121, so that the high-pressure gas drives the piston plate 113 to move upward, and sliding plate 2 222 will block flow groove 2 221, so that the high-pressure gas cannot be transmitted to the top of the piston plate 113 through flow groove 2 221 and flow groove 1 122.

[0087] The second blocking component 21 includes a second sliding rod 213 fixedly connected to the top of the first sliding plate 211, and the outer wall of the second sliding rod 213 is slidably connected to the outer wall of the piston plate 113;

[0088] When the piston plate 113 moves to its highest position, the top of the piston plate 113 contacts the block on the top of the second sliding rod 213. The piston plate 113 drives the first sliding plate 211 to slide upward via the second sliding rod 213, so that the first through hole 212 and the first exhaust groove 121 overlap. The high-pressure gas at the bottom of the piston plate 113 is discharged outward through the first through hole 212 and the first exhaust groove 121.

[0089] By utilizing the characteristic that the top of the piston plate 113 is filled with gas and moves downward, the resistance to the downward sliding of the sliding block 324, sliding plate 1 211 and sliding plate 2 22 is increased. When the piston plate 113 slides downward, it will drive the round rod 326 to slide downward synchronously, and when it reaches the lowest position, the round block 327 drives the sliding block 324 to move downward, so that the U-shaped groove 325 and the top space of the piston plate 113 are interconnected, and the high-pressure gas at the top of the piston plate 113 will be discharged outward through the U-shaped groove 325. Through the application of the above-mentioned components, the accumulation of high-pressure gas on the top of the piston plate 113 can be avoided, which affects the sliding efficiency of the piston plate 113.

[0090] The first blocking component 22 includes a second through hole 223 formed on the side wall of the second sliding plate 222;

[0091] When the second sliding plate 222 is pressed upward, the second through hole 223 and the second flow groove 221 overlap. At this time, the high-pressure gas can be transmitted to the top of the piston plate 113 through the second flow groove 221 and the first flow groove 122, causing the piston plate 113 to slide downward.

[0092] Taking advantage of the above-mentioned feature of the sliding rod 112 moving up and down, a rotating plate 322 is provided inside the device. When the sliding rod 112 moves upward, the rotating plate 322 will rotate downward with the connection point as the center, and form an angle of 80 degrees with the sliding rod 112, thereby increasing the contact surface between the rotating plate 322 and the powdered raw material. When the sliding rod 112 moves downward, the rotating plate 322 will rotate upward with the connection point as the center, and force the rotating plate 322 to present the following Figure 8 The state of the above components is to reduce the resistance encountered by the sliding rod 112 when it moves downward;

[0093] The circulation assembly 31 includes a round rod 1 314 fixedly connected to the top of the convex plate 313, a round rod 2 315 fixedly connected to the bottom of the convex plate 313, and an outer wall of the round rod 2 315 fixedly connected to the bottom of the sliding plate 222;

[0094] When the high-pressure gas at the bottom of the piston plate 113 is discharged outward through the first through-hole 212 and the first exhaust groove 121, the flowing gas passes through the gap between the convex plate 313 and the inner wall of the bell tube 311. The pressure of the gas flow forces the convex plate 313 to drive the sliding frame 312 to block the bottom of the bell tube 311, restricting the flow of gas. At this time, the convex plate 313 moves upward via the second round rod 315 and the second sliding plate 222, so that the second through-hole 223 overlaps the second flow groove 221.

[0095] When the convex plate 313 moves upward, the convex plate 313 moves upward through the round rod 2 315 and the sliding plate 222, so that the through hole 223 coincides with the flow groove 2 221. At this time, the high-pressure gas can be transmitted to the top of the piston plate 113 through the flow groove 221 and the flow groove 1 122, so that the piston plate 113 slides downward; through the application of the above components, it is achieved that in a high-temperature closed environment, the equipment can drive the powdered raw materials to flow, thereby avoiding large differences in the heating of the raw materials inside the equipment.

[0096] The exhaust assembly 32 includes a groove 321 formed on the outer wall of the bottom of the sliding rod 112. A rotating plate 322 is rotatably connected to the inner wall of the groove 321. A plurality of limiting blocks 323 are fixedly connected to the outer wall of the sliding rod 112.

[0097] When the sliding rod 112 moves upward, the rotating plate 322 contacts the external powdered material, causing the rotating plate 322 to open outward while being inserted into the powder. As the sliding rod 112 moves upward, the powder material in the center of the crucible 13 will move upward synchronously driven by the rotating plate 322, while the powder around the crucible 13 will slide down.

[0098] When the sliding rod 112 moves downward, the rotating plate 322 will rotate upward with the connection point as the center, and when the sliding rod 112 moves upward, the rotating plate 322 will rotate downward with the connection point as the center, and form an angle of 80 degrees with the sliding rod 112;

[0099] Utilizing the above-mentioned characteristic that the piston plate 113 slides up and down, before the piston plate 113 moves down to the lowest position, the bottom of the piston plate 113 first contacts the top of the sliding plate 222 and forces the sliding plate 222 to move down, and the through hole 223 is misaligned with the exhaust groove 121; then the piston plate 113 continues to move down. Due to the compressibility of the gas, when the piston plate 113 contacts the top of the round rod 1 314, the pressure on the top of the piston plate 113 and the pressure on the bottom of the sliding frame 312 belong to the same high-pressure gas, so the above two forces are equal. After the piston plate 113 contacts the top of the round rod 1 314, due to the compression of the gas between the piston plate 113 and the partition 111, the compression force will exert an additional downward pressure on the top position of the convex plate 313, forcing the convex plate 313 and the sliding frame 312 away from the bell tube 311, so that the high-pressure gas inside the crucible 13 can pass through. Figure 7 The gap in the middle G enters the bottom of the piston plate 113 again. At this time, since the exhaust groove 121 and the through hole 212 are misaligned, the high-pressure gas inside the crucible 13 will no longer drive the convex plate 313 to move upward after passing through the above G position. Therefore, when the equipment is heated, it can continuously drive the sliding rod 112 to slide up and down, thereby accelerating the heating efficiency of the powdered raw materials.

[0100] A specific application of this embodiment is as follows: before use, the present invention first pours the powdered raw material into the crucible 13, then screws the screw cap 14 into the crucible 13, and ensures that the sliding rod 112 extends into the crucible 13, and then places the device into the heating area, so that the crucible 13 is subjected to high temperature while heating the powdered material inside the crucible 13;

[0101] Taking advantage of the fact that the temperature inside the crucible 13 is constantly rising, a pressure mechanism 1 and a blocking mechanism 2 are provided inside the device. When the crucible 13 generates high-pressure gas due to the high temperature, the high-pressure gas will flow to the bottom of the piston plate 113 through the holes around the partition 111, forcing the piston plate 113 to slide upward along the inner wall of the threaded cover 14, and drive the sliding rod 112 and the exhaust assembly 32 to move upward synchronously. When the sliding rod 112 moves upward, the rotating plate 322 contacts the external powdered material, so that the rotating plate 322 opens outward and is inserted into the powder. As the sliding rod 112 moves upward, the powder material in the center of the crucible 13 will be driven by the rotating plate 322 and move upward synchronously, while the powder around the crucible 13 will slide downward.

[0102] When the piston plate 113 reaches the highest position, the top of the piston plate 113 will come into block contact with the top of the sliding rod 213, forcing the sliding rod 213 and the sliding plate 1 211 to move upward synchronously, so that the through hole 1 212 coincides with the exhaust groove 121, and the high-pressure gas at the bottom of the piston plate 113 is discharged outward through the through hole 1 212 and the exhaust groove 121. At this time, the high-pressure gas inside the crucible 13 will pass through Figure 7 The gap in the middle G reaches the bottom of the piston plate 113, and the gas at the bottom of the piston plate 113 will be discharged outward through the exhaust groove 121. At this time, the gas is in a flowing state. The pressure of the gas flow will force the convex plate 313 to drive the sliding frame 312 to block the bottom of the bell tube 311, restricting the gas flow and preventing the high-pressure gas from entering the bottom of the piston plate 113.

[0103] When the convex plate 313 moves upward, the convex plate 313 moves upward through the second round rod 315 and the second sliding plate 222, so that the second through hole 223 coincides with the second flow groove 221. At this time, the high-pressure gas can be transmitted to the top of the piston plate 113 through the second flow groove 221 and the first flow groove 122, causing the piston plate 113 to slide downward. Through the application of the above components, the device can drive the powdered raw materials to flow in a high-temperature closed environment, avoiding large differences in the heating of the raw materials inside the device.

[0104] Utilizing the above-mentioned characteristic that the piston plate 113 slides up and down, before the piston plate 113 moves down to the lowest position, the bottom of the piston plate 113 first contacts the top of the sliding plate 222 and forces the sliding plate 222 to move down, and the through hole 223 is misaligned with the exhaust groove 121; then the piston plate 113 continues to move down. Due to the compressibility of the gas, when the piston plate 113 contacts the top of the round rod 1 314, the pressure on the top of the piston plate 113 and the pressure on the bottom of the sliding frame 312 belong to the same high-pressure gas, so the above two forces are equal. After the piston plate 113 contacts the top of the round rod 1 314, due to the compression of the gas between the piston plate 113 and the partition 111, the compression force will exert an additional downward pressure on the top position of the convex plate 313, forcing the convex plate 313 and the sliding frame 312 away from the bell tube 311, so that the high-pressure gas inside the crucible 13 can pass through. Figure 7 The gap in the middle G enters the bottom of the piston plate 113 again. At this time, since the exhaust groove 121 and the through hole 212 are misaligned, the high-pressure gas inside the crucible 13 will no longer drive the convex plate 313 to move upward after passing through the above G position. Therefore, when the device is heated, it can continuously drive the sliding rod 112 to slide up and down, thereby accelerating the heating efficiency of the powdered raw material.

[0105] Taking advantage of the above-mentioned feature of the sliding rod 112 moving up and down, a rotating plate 322 is provided inside the device. When the sliding rod 112 moves upward, the rotating plate 322 will rotate downward with the connection point as the center, and form an angle of 80 degrees with the sliding rod 112, thereby increasing the contact surface between the rotating plate 322 and the powdered raw material. When the sliding rod 112 moves downward, the rotating plate 322 will rotate upward with the connection point as the center, and force the rotating plate 322 to present the following Figure 8 The state of the above components is to reduce the resistance encountered by the sliding rod 112 when it moves downward;

[0106] By utilizing the characteristic that the top of the piston plate 113 is filled with gas and moves downward, the downward sliding resistance of the sliding block 324, the sliding plate 1 211, and the sliding plate 2 22 is increased. When the piston plate 113 slides downward, it drives the round rod 326 to slide downward synchronously. When it reaches the lowest position, the round block 327 drives the sliding block 324 to move downward, so that the U-shaped groove 325 and the top space of the piston plate 113 are interconnected. The high-pressure gas at the top of the piston plate 113 is discharged outward through the U-shaped groove 325. The application of the above components prevents the accumulation of high-pressure gas at the top of the piston plate 113, which affects the sliding efficiency of the piston plate 113.

[0107] In addition, when the piston plate 113 moves upward, the piston plate 113 first contacts the sliding block 324, forcing the sliding block 324 to block the U-shaped groove 325, and then contacts the block of the second sliding rod 213, driving the through hole 1 212 to move upward.

[0108] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A graphite crucible for carbonizing negative electrode materials of lithium batteries, comprising a crucible (13), wherein the top of the crucible (13) is engaged with a threaded cover (14), characterized in that: Also includes: A pressure mechanism (1), the pressure mechanism (1) being fixedly connected to the inner wall of the threaded cover (14), and being used to receive the high pressure gas inside the crucible (13) and force the pressure mechanism (1) to slide; A blocking mechanism (2), the blocking mechanism (2) being slidably connected to the inner wall of the pressure mechanism (1) and used for blocking the pipeline inside the threaded cover (14); A pressure relief mechanism (3), the pressure relief mechanism (3) being fixedly connected to the outer wall of the pressure mechanism (1) and configured to drive the powdered raw material inside the crucible (13) to circulate when the pressure mechanism (1) slides up and down; When high pressure appears inside the crucible (13), the pressure generated by the high-pressure gas will force the pressure mechanism (1) to drive the pressure relief mechanism (3) to slide up and down, and cause the powdered raw materials inside the crucible (13) to flow and break up; The pressure mechanism (1) comprises: A pressure-bearing component (11), wherein the pressure-bearing component (11) is fixedly connected to the inner wall of the threaded cover (14) via a fixing member; The fixed connection comprises a partition (111) fixedly connected to the inner wall of the threaded cover (14), and a sliding rod (112) is slidably connected to the inner wall of the through hole of the partition (111); A flow assembly (12), wherein the flow assembly (12) is fixedly connected to the bottom of the threaded cover (14) via a restriction member; The limiting member comprises a first fixing block (123) fixedly connected to the bottom of the threaded cover (14), and a second fixing block (124) is fixedly connected to the bottom of the threaded cover (14); When high pressure is generated inside the crucible (13) due to high temperature, the high-pressure gas will pass through the four small holes around the partition (111) and act on the bottom of the pressure component (11), forcing the pressure component (11) to drive the sliding rod (112) to slide upward along the through hole of the partition (111); The blocking mechanism (2) comprises: A second blocking component (21), wherein the second blocking component (21) is slidably connected to the inner wall of the first fixed block (123) via a sliding member; The sliding member comprises a sliding plate (211) slidably connected to the inner wall of the fixed block (123), and a through hole (212) is formed on the side wall of the sliding plate (211); A blocking component (22), wherein the blocking component (22) is slidably connected to the inner wall of the fixed block (124) via a blocking member; The blocking member includes a second flow groove (221) provided on the side wall of the second fixed block (124), and a second sliding plate (222) is slidably connected to the inner wall of the second fixed block (124); In the normal state, the sliding plate 1 (211) blocks the flow component (12) and restricts the gas inside the threaded cover (14) from flowing out.

2. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 1, characterized in that: The pressure relief mechanism (3) comprises: A circulation assembly (31), wherein the circulation assembly (31) is fixedly connected to the bottom of the partition (111) via a restriction member; The limiting member comprises a trumpet tube (311) connected to the bottom of the partition (111); the bottom of the trumpet tube (311) is slidably connected to a sliding frame (312); and the top of the sliding frame (312) is fixedly connected to a convex plate (313); An exhaust assembly (32), the exhaust assembly (32) being slidably connected to the inner wall of the through hole at the top of the threaded cover (14) via a pressure relief member; The pressure relief member comprises a sliding block (324) slidably connected to the inner wall of the threaded cover (14), a U-shaped groove (325) is provided on the side wall of the sliding block (324), a round rod (326) is slidably connected to the inner wall of the sliding block (324), and a round block (327) is fixedly connected to the top of the round rod (326); When the pressure mechanism (1) is in operation, the pressure component (11) drives the sliding block (324) to slide downward through the round block (327) and the round rod (326), so that the high-pressure gas at the top of the pressure component (11) is discharged outward through the U-shaped groove (325).

3. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 2, characterized in that: The pressure component (11) includes a piston plate (113) fixedly connected to the top of the sliding rod (112), and the side wall of the piston plate (113) is slidably connected to the inner wall of the threaded cover (14); When the high-pressure gas flows upward through the holes of the partition (111), it acts on the bottom of the piston plate (113), forcing the piston plate (113) to slide upward along the inner wall of the threaded cover (14).

4. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 3, characterized in that: The flow component (12) includes an exhaust groove (121) provided on the inner wall of the threaded cover (14), and a flow groove (122) is provided on the inner wall of the threaded cover (14); Among them, under normal conditions, sliding plate 1 (211) blocks exhaust groove 1 (121), so that the high-pressure gas drives the piston plate (113) to move upward, and sliding plate 2 (222) blocks flow groove 2 (221), so that the high-pressure gas cannot be transmitted to the top of the piston plate (113) through flow groove 2 (221) and flow groove 1 (122).

5. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 4, characterized in that: The second blocking component (21) includes a second sliding rod (213) fixedly connected to the top of the first sliding plate (211), and the outer wall of the second sliding rod (213) is slidably connected to the outer wall of the piston plate (113); Among them, after the piston plate (113) moves to the highest position, the top of the piston plate (113) will contact the block at the top of the sliding rod 2 (213). At this time, the piston plate (113) drives the sliding plate 1 (211) to slide upward through the sliding rod 2 (213), so that the through hole 1 (212) and the exhaust groove 1 (121) form an overlapping state, and the high-pressure gas at the bottom of the piston plate (113) is discharged outward through the through hole 1 (212) and the exhaust groove 1 (121).

6. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 5, characterized in that: The blocking component 1 (22) includes a through hole 2 (223) provided on the side wall of the sliding plate 2 (222); When the sliding plate 2 (222) is pressed and moved upward, the through hole 2 (223) and the flow groove 2 (221) are in an overlapping state. At this time, the high-pressure gas can be transmitted to the top of the piston plate (113) through the flow groove 2 (221) and the flow groove 1 (122), causing the piston plate (113) to slide downward.

7. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 6, characterized in that: The circulation assembly (31) includes a round rod 1 (314) fixedly connected to the top of the convex plate (313), a round rod 2 (315) fixedly connected to the bottom of the convex plate (313), and an outer wall of the round rod 2 (315) fixedly connected to the bottom of the sliding plate 2 (222); When the high-pressure gas at the bottom of the piston plate (113) is discharged outward through the through hole 1 (212) and the exhaust groove 1 (121), the flowing gas passes through the gap between the convex plate (313) and the inner wall of the bell tube (311). The pressure of the gas flow will force the convex plate (313) to drive the sliding frame (312) to seal at the bottom of the bell tube (311), thereby restricting the flow of gas. At this time, the convex plate (313) moves upward through the round rod 2 (315) and the sliding plate 2 (222), so that the through hole 2 (223) and the flow groove 2 (221) coincide with each other.

8. The graphite crucible for carbonizing anode materials for lithium batteries according to claim 7, characterized in that: The exhaust assembly (32) includes a groove (321) provided on the outer wall of the bottom of the sliding rod (112), a rotating plate (322) is rotatably connected to the inner wall of the groove (321), and a plurality of limiting blocks (323) are fixedly connected to the outer wall of the sliding rod (112); When the sliding rod (112) moves downward, the rotating plate (322) will rotate upward with the connection point as the center, and when the sliding rod (112) moves upward, the rotating plate (322) will rotate downward with the connection point as the center and form an angle of eighty degrees with the sliding rod (112).

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