Ultrahigh-temperature lithium ion battery negative electrode material sintering roller kiln

Abstract

The utility model discloses an ultra-high temperature lithium ion battery cathode material sintering roller kiln which comprises a kiln channel, the kiln channel is arranged in a penetrating mode from front to back, a row of horizontal roller bars are installed in the kiln channel in a rotating mode, brake bowls capable of moving front and back are arranged on the roller bars, and an inlet replacement area is arranged in front of the kiln channel. An outlet replacement area is arranged behind the kiln channel; a heating section, a constant temperature section and a cooling section are sequentially arranged in the kiln channel from front to back; according to the utility model, a negative electrode material to be sintered is placed in the brake bowl, then the brake bowl containing the negative electrode material is moved to the sintering area along the roller rod, and is heated by the silicon carbide rod in the corundum tube, so that the temperature in the sintering area is increased, and the purpose of sintering the negative electrode material in the brake bowl is achieved; and heat in the kiln channel is slowly dissipated, so that the temperature rise speed of the sintering area is increased, the sintering time of the negative electrode material is shortened, and the sintering speed of the negative electrode material is increased.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery anode material sintering technology, specifically to an ultra-high temperature lithium-ion battery anode material sintering roller kiln. Background Technology

[0002] The sintering process of lithium-ion battery anode materials is a crucial step in anode material manufacturing. Sintering is a heat treatment process in which the anode material is heated at a specific rate under conditions of isolation from air and dielectric protection. Sintered anode materials exhibit stable strength and significantly improved thermal conductivity, electrical conductivity, and high-temperature resistance. The sintering process is complex and involves numerous chemical changes.

[0003] In the sintering process of anode materials, the heating rate of the sintering furnace affects the sintering time and production efficiency of the anode materials. Due to the insulation materials and structure of existing sintering equipment, the heating and insulation effects of the kiln are not ideal when ultra-high temperature lithium-ion battery anode materials need to be sintered. Therefore, this application proposes an ultra-high temperature lithium-ion battery anode material sintering roller kiln to improve the heating rate. Utility Model Content

[0004] The purpose of this invention is to provide an ultra-high temperature lithium-ion battery anode material sintering roller kiln to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a roller kiln for sintering ultra-high temperature lithium-ion battery negative electrode materials, including a kiln channel that runs through the kiln from front to back. A row of horizontal rollers is rotatably installed inside the kiln channel. The rollers are equipped with guillotine bowls that can move back and forth. An inlet replacement area is provided in front of the kiln channel, and an outlet replacement area is provided at the rear of the kiln channel.

[0006] The kiln passage is provided with a heating section, a constant temperature section and a cooling section from front to back. The heating section and the constant temperature section constitute a sintering zone. Corundum tubes are provided above and below the sintering zone, and silicon carbide rods are inserted inside the corundum tubes.

[0007] The bottom of the kiln is equipped with a furnace gas injection pipe for conveying nitrogen.

[0008] A ceramic tube is inserted into one side of the kiln passage near the sintering zone, and a thermocouple is inserted inside the ceramic tube. The thermocouple is used to detect the temperature information in the sintering zone.

[0009] The kiln channel is provided with a first ceramic fiber board, a nano board, a third ceramic fiber board, a fourth ceramic fiber board, a fifth ceramic fiber board, a sixth ceramic fiber board, a sixth insulating brick, and a fifth insulating brick on both sides from the inside to the outside.

[0010] The nanoplate is provided below a second ceramic fiber plate, and the nanoplate and the second ceramic fiber plate have the same thickness.

[0011] The sixth and fifth insulating bricks are provided with perforated bricks at positions corresponding to the roller bar, and the surface of the perforated bricks is provided with a first through hole that cooperates with the roller bar.

[0012] The first ceramic fiber board, the nano board, the third ceramic fiber board, the fourth ceramic fiber board, the fifth ceramic fiber board, and the sixth ceramic fiber board are provided with a first ceramic fiber cotton layer at the position corresponding to the roller, and a second through hole that cooperates with the roller is opened at the axis of the first ceramic fiber cotton layer.

[0013] The bottom of the kiln channel is provided with B-1 insulating brick, the ninth ceramic fiber board, the eighth ceramic fiber board, the seventh ceramic fiber board, the fourth insulating brick and the third insulating brick in sequence from bottom to top.

[0014] Among them, the second insulation brick and the first insulation brick are arranged on both sides of the B-1 insulation brick, the ninth ceramic fiber board, the eighth ceramic fiber board, the seventh ceramic fiber board and the fourth insulation brick from bottom to top.

[0015] The top of the kiln passage is provided with a first arch brick and a second arch brick from bottom to top. The first arch brick is provided with arch foot bricks on both sides, and the second arch brick is provided with outer arch foot bricks on both sides.

[0016] The second arch brick is provided with multiple layers of ceramic fiber blankets, and the ceramic fiber blankets are covered with a second layer of ceramic fiber cotton.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention transports the sintered guillotine to the kiln through the inlet replacement zone. The guillotine then passes through the heating, constant temperature, and cooling sections within the kiln to sinter the negative electrode material inside. The sintered guillotine is then removed from the outlet replacement zone for easy material feeding and unloading. The negative electrode material to be sintered is placed inside the guillotine, and then moved along rollers to the sintering zone. Heating is achieved by silicon carbide rods inside the corundum tube, raising the temperature within the sintering zone and sintering the negative electrode material. By installing ceramic fiber boards and insulating bricks inside the kiln, heat dissipation within the kiln is slowed, thus accelerating the heating rate of the sintering zone, reducing the sintering time of the negative electrode material, and increasing the sintering speed of the negative electrode material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2This is a schematic diagram of the temperature change in the kiln passage of this utility model;

[0021] Figure 3 This is a schematic diagram of the isometric structure of the kiln passage of this utility model;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the kiln passage of this utility model.

[0023] In the diagram: 1. Kiln passage; 2. Corundum tube; 3. Silicon carbide rod; 4. Ceramic tube; 5. Thermocouple; 6. Gate; 7. Roller; 8. First ceramic fiber cotton layer; 9. First ceramic fiber board; 10. Nanoboard; 11. Second ceramic fiber board; 12. Third ceramic fiber board; 13. Fourth ceramic fiber board; 14. Fifth ceramic fiber board; 15. Sixth ceramic fiber board; 16. First insulating brick; 17. Second insulating brick; 18. Third insulating brick; 19. Fourth insulating brick; 20. Seventh ceramic fiber board; 21. Eighth ceramic fiber board; 22. Ninth ceramic fiber board; 23. B-1 24. Insulating brick; 25. Gas injection pipe in furnace; 26. Perforated brick; 27. Fifth insulating brick; 28. Sixth insulating brick; 29. ​​Arch foot brick; 30. Outer brick of arch foot; 31. Second ceramic fiber cotton layer; 32. First arch top brick; 33. Second arch top brick; 34. Ceramic fiber blanket; 35. Inlet replacement zone; 36. Outlet replacement zone. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figure 1-4 This utility model provides a technical solution: a roller kiln for sintering ultra-high temperature lithium-ion battery negative electrode materials, including a kiln 1, which is arranged from front to back. A row of horizontal rollers 7 are rotatably installed inside the kiln 1. The rollers 7 are equipped with guillotine 6 that can move back and forth. An inlet replacement zone 34 is provided in front of the kiln 1, and an outlet replacement zone 35 is provided at the rear of the kiln 1. The guillotine 6 with negative electrode material is first transported to the inlet replacement zone 34 by the inlet conveyor belt. The inlet replacement zone 34 isolates the atmosphere between the kiln 1 and the inlet conveyor belt. Then, the guillotine 6 with negative electrode material enters the kiln 1 through the inlet replacement zone 34.

[0026] The outlet replacement zone 35 isolates the atmosphere between the kiln passage 1 and the outlet conveyor belt. After the sintering of the guillotine 6 with negative electrode material in the kiln passage 1, it enters the outlet conveyor belt through the outlet replacement zone 35 and is transported backward by the outlet conveyor belt.

[0027] The kiln 1 is equipped with a heating section, a constant temperature section and a cooling section from front to back. The heating section and the constant temperature section constitute the sintering zone. When the negative electrode material needs to be sintered, the negative electrode material is placed into the jar 6. Then, the jar 6 containing the negative electrode material is transported into the kiln 1 through the inlet replacement zone 34. The jar 6 then passes through the heating section, constant temperature section and cooling section in the kiln 1 in sequence to sinter the negative electrode material in the jar 6.

[0028] A corundum tube 2 is provided above and below the sintering zone. A silicon carbide rod 3 is inserted inside the corundum tube 2. Heating is carried out through the silicon carbide rod 3 inside the corundum tube 2, thereby raising the temperature in the sintering zone. When the jar 6 containing the negative electrode material is moved into the sintering zone, the high temperature in the sintering zone sinters the negative electrode material.

[0029] The bottom of the kiln duct 1 is equipped with a furnace gas injection pipe 24 for conveying nitrogen. The furnace gas injection pipe 24 is connected to an external nitrogen delivery pump. The nitrogen delivery pump and the furnace gas injection pipe 24 constitute a nitrogen delivery system. The nitrogen delivery pump delivers nitrogen to the kiln duct 1 through the furnace gas injection pipe 24, so that the sintering zone in the kiln duct 1 is filled with nitrogen. Under the protection of nitrogen, the negative electrode material is sintered in the sintering zone.

[0030] A ceramic tube 4 is inserted into one side of the kiln passage 1 near the sintering zone. A thermocouple 5 is inserted inside the ceramic tube 4. The thermocouple 5 is used to detect the temperature information in the sintering zone. The thermocouple 5 is electrically connected to an external controller and uploads the detected temperature information to the controller. When the temperature in the sintering zone is lower than the set threshold, the controller controls the silicon carbide rod 3 to increase the temperature. When the temperature in the sintering zone is higher than the set threshold, the controller controls the silicon carbide rod 3 to decrease the temperature, which facilitates the control of the sintering temperature in the sintering zone.

[0031] The kiln passage 1 is equipped with, from the inside to the outside, a first ceramic fiber board 9, a nano board 10, a third ceramic fiber board 12, a fourth ceramic fiber board 13, a fifth ceramic fiber board 14, a sixth ceramic fiber board 15, a sixth insulating brick 27, and a fifth insulating brick 26. The first ceramic fiber board 9 is a ceramic fiber board that can withstand 1000℃; the nano board 10 is resistant to 1000℃; the third ceramic fiber board 12 is a ceramic fiber board that can withstand 1260℃; the fourth ceramic fiber board 13 is a ceramic fiber board that can withstand 1400℃; the fifth ceramic fiber board 14 is a ceramic fiber board that can withstand 1430℃; the sixth ceramic fiber board 15 is a ceramic fiber board that can withstand 1500℃; the sixth insulating brick 27 is a TJM30 brick; and the fifth insulating brick 26 is a TJM30 brick.

[0032] Below the nanoplate 10, there is a second ceramic fiber plate 11. The nanoplate 10 and the second ceramic fiber plate 11 have the same thickness. The second ceramic fiber plate 11 is a ceramic fiber plate that can withstand 1000℃.

[0033] Among them, the sixth insulating brick 27 and the fifth insulating brick 26 are provided with perforated bricks 25 at the positions corresponding to the roller 7. The surface of the perforated brick 25 is provided with a first through hole that cooperates with the roller 7. Both ends of the roller 7 pass through the first through hole to ensure that the roller 7 can rotate normally.

[0034] Among them, the first ceramic fiber board 9, nano board 10, third ceramic fiber board 12, fourth ceramic fiber board 13, fifth ceramic fiber board 14 and sixth ceramic fiber board 15 are provided with a first ceramic fiber cotton layer 8 at the position corresponding to the roller 7. The first ceramic fiber cotton layer 8 is loose cotton that can withstand 1600℃. A second through hole that cooperates with the roller 7 is opened at the axis of the first ceramic fiber cotton layer 8. The two ends of the roller 7 pass through the first through hole and the second through hole in sequence to ensure that the roller 7 can rotate normally. In this way, the guillotine 6 can move forward along the roller 7 (changing sliding friction to rolling friction, which makes it easier to push the guillotine 6 forward along the roller 7).

[0035] The bottom of the kiln passage 1 is provided with B-1 insulating brick 23, ninth ceramic fiber board 22, eighth ceramic fiber board 21, seventh ceramic fiber board 20, fourth insulating brick 19, and third insulating brick 18 from bottom to top. B-1 insulating brick 23 is a B1 grade rubber insulating board; ninth ceramic fiber board 22 is a ceramic fiber board resistant to 1260℃; eighth ceramic fiber board 21 is a ceramic fiber board resistant to 1430℃; seventh ceramic fiber board 20 is a ceramic fiber board resistant to 1500℃; fourth insulating brick 19 is a TJM30 brick; and third insulating brick 18 is a TJM30 brick.

[0036] Among them, the second insulating brick 17 and the first insulating brick 16 are arranged from bottom to top on both sides of the B-1 insulating brick 23, the ninth ceramic fiber board 22, the eighth ceramic fiber board 21, the seventh ceramic fiber board 20 and the fourth insulating brick 19; the second insulating brick 17 is a TJM26 brick; the first insulating brick 16 is a TJM28 brick.

[0037] Among them, the top of the kiln passage 1 is provided with a first arch brick 31 and a second arch brick 32 from bottom to top. The first arch brick 31 is provided with arch foot bricks 28 on both sides, and the second arch brick 32 is provided with arch foot outer bricks 29 on both sides. The first arch brick 31, the second arch brick 32, the arch foot bricks 28 and the arch foot outer bricks 29 are all TJM30 bricks.

[0038] Among them, a multi-layer ceramic fiber blanket 33 is provided above the second arch brick 32. The ceramic fiber blanket 33 consists of three layers from bottom to top: a 1430℃ ceramic fiber blanket, a 1260℃ ceramic fiber blanket, and a 1000℃ ceramic fiber blanket.

[0039] A second ceramic fiber cotton layer 30 is covered on top of the ceramic fiber blanket 33. The second ceramic fiber cotton layer 30 is loose cotton that can withstand 1000℃.

[0040] Specifically, by setting ceramic fiber boards and insulating bricks inside the kiln channel, the heat loss inside the kiln channel becomes slower, thereby accelerating the heating rate of the sintering zone, reducing the sintering time of the negative electrode material, and increasing the sintering speed of the negative electrode material.

[0041] Working principle: When sintering the negative electrode material, the negative electrode material is placed into the sintering bowl 6. Then, the sintering bowl 6 containing the negative electrode material is transported to the kiln 1 through the inlet replacement zone 34. The sintering bowl 6 then passes through the heating section, the constant temperature section, and the cooling section in the kiln 1 in sequence to sinter the negative electrode material. Specifically, when the sintering bowl 6 containing the negative electrode material passes through the heating section, it is heated by the silicon carbide rod 3 in the corundum tube 2, thereby achieving the effect of heating. When the sintering bowl 6 containing the negative electrode material passes through the constant temperature section, it is heated by the silicon carbide rod 3 in the corundum tube 2, achieving the effect of constant temperature sintering. At the same time, by setting ceramic fiber boards and heat-insulating bricks on the inside of the kiln 1, the heat loss in the kiln 1 is made slower, thereby accelerating the heating rate of the heating section, reducing the sintering time of the negative electrode material, and improving the sintering speed of the negative electrode material.

[0042] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A high-temperature lithium-ion battery anode material sintering roller kiln, comprising a kiln channel (1), characterized in that: The kiln passage (1) is arranged from front to back. A row of horizontal rollers (7) is installed inside the kiln passage (1). The rollers (7) are equipped with guillotine bowls (6) that can move back and forth. An inlet replacement area (34) is provided in front of the kiln passage (1), and an outlet replacement area (35) is provided behind the kiln passage (1). The kiln channel (1) is provided with a heating section, a constant temperature section and a cooling section from front to back. The heating section and the constant temperature section constitute a sintering zone. Corundum tubes (2) are provided above and below the sintering zone. Silicon carbide rods (3) are inserted inside the corundum tubes (2). The bottom of the kiln (1) is provided with a furnace gas injection pipe (24) for conveying nitrogen.

2. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 1, characterized in that: A ceramic tube (4) is inserted into one side of the kiln channel (1) near the sintering zone. A thermocouple (5) is inserted inside the ceramic tube (4). The thermocouple (5) is used to detect the temperature information in the sintering zone.

3. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 1, characterized in that: The kiln channel (1) is provided with a first ceramic fiber board (9), a nano board (10), a third ceramic fiber board (12), a fourth ceramic fiber board (13), a fifth ceramic fiber board (14), a sixth ceramic fiber board (15), a sixth insulating brick (27), and a fifth insulating brick (26) on both sides from the inside to the outside.

4. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 3, characterized in that: A second ceramic fiber plate (11) is provided below the nanoplate (10), and the nanoplate (10) and the second ceramic fiber plate (11) have the same thickness.

5. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 3, characterized in that: The sixth insulating brick (27) and the fifth insulating brick (26) are provided with perforated bricks (25) at the positions corresponding to the roller (7), and the surface of the perforated brick (25) is provided with a first through hole that cooperates with the roller (7).

6. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 3, characterized in that: The first ceramic fiber board (9), nano board (10), third ceramic fiber board (12), fourth ceramic fiber board (13), fifth ceramic fiber board (14) and sixth ceramic fiber board (15) are provided with a first ceramic fiber cotton layer (8) at the position corresponding to the roller (7), and a second through hole that cooperates with the roller (7) is opened at the axis of the first ceramic fiber cotton layer (8).

7. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 1, characterized in that: The bottom of the kiln channel (1) is provided with B-1 insulation brick (23), ninth ceramic fiber board (22), eighth ceramic fiber board (21), seventh ceramic fiber board (20), fourth insulation brick (19) and third insulation brick (18) in sequence from bottom to top.

8. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 7, characterized in that: The B-1 insulation brick (23), the ninth ceramic fiber board (22), the eighth ceramic fiber board (21), the seventh ceramic fiber board (20) and the fourth insulation brick (19) are provided with a second insulation brick (17) and a first insulation brick (16) from bottom to top on both sides.

9. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 1, characterized in that: The top of the kiln passage (1) is provided with a first arch brick (31) and a second arch brick (32) from bottom to top. The first arch brick (31) is provided with arch foot bricks (28) on both sides, and the second arch brick (32) is provided with arch foot outer bricks (29) on both sides.

10. The ultra-high temperature lithium-ion battery anode material sintering roller kiln according to claim 9, characterized in that: The second arch brick (32) is provided with a multi-layer ceramic fiber blanket (33), and the ceramic fiber blanket (33) is covered with a second ceramic fiber cotton layer (30).

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