Vertical granulation kettle for graphite cathode material granulation

Abstract

The utility model discloses a vertical granulation kettle for graphite cathode material granulation, which belongs to the technical field of granulation kettles and comprises a granulation kettle body, a feeding device arranged on the upper end face of the granulation kettle body, a discharging device arranged on the lower end face of the granulation kettle body and a driving device arranged above the granulation kettle body. The output end of the driving device is connected with a stirring device in the granulation kettle body, and an adjusting device is arranged on the stirring device. By arranging the driving device, the stirring device and the adjusting device, when the device is used, the driving device drives the stirring device to rotate, so that the stirring device stirs materials in the granulation kettle body, and meanwhile, the adjusting device forces the stirring device to intermittently move up and down in the granulation kettle body; the graphite negative electrode material is radially stirred while being disturbed up and down, so that the stirring vortex of the graphite negative electrode material is increased, the stirring effect is improved, and the granulation efficiency of the graphite negative electrode material is further improved.

Description

Technical Field

[0001] The utility model relates to a granulation kettle, in particular to a vertical granulation kettle for granulating graphite negative electrode materials. Background Art

[0002] Secondary granulation is a crucial process currently used in high-end artificial graphite to balance energy density and rate performance. The purpose of primary granulation is to reduce the volume of negative electrode particles, while the purpose of secondary granulation is to bond small particles into larger ones.

[0003] In terms of rate performance, smaller negative electrode particles have a larger specific surface area, which increases the number of channels for lithium ion migration and shortens the path, facilitating lithium ion movement. In terms of capacity, larger negative electrode particles have a higher compaction density, which increases the spatial utilization of active particles and facilitates lithium storage. Secondary particles prepared through granulation combine the advantages of large particles with high compaction density and capacity, and small particles with a larger specific surface area and more lithium ion insertion and extraction channels. The isotropy of the secondary particles is also improved, achieving a balanced balance between energy density and rate performance.

[0004] The existing secondary granulation of graphite negative electrode materials is generally carried out by coating granulation. The specific method is to use asphalt as a coating raw material and mix it with graphite particles. After carbonization, an amorphous carbon coating is formed on the surface of the graphite to construct a layered "core-shell structure". Specifically, the ground graphite negative electrode material (primary granulation) and asphalt in a set proportion are added to the granulation kettle, and then stirred and mixed to slowly form particles of a set size to achieve secondary granulation. The existing granulation kettle stirring device is mostly radial stirring, which has poor stirring effect and low production efficiency.

[0005] After searching, the patent publication number is: CN113769691A, which discloses a high-efficiency stirring vertical reactor, including a jacketed reactor, a spliced high-efficiency stirring device is provided inside the jacketed reactor, a transmission fixing device is provided above the interior of the jacketed reactor, and a sealed bottom stirring and discharging device is provided below the interior of the jacketed reactor.

[0006] The above solution stirs the material through a transverse stirring shaft and a stirring frame, but the largest vortex formed by this stirring method is radial, resulting in poor stirring and mixing effect and low production efficiency. Utility Model Content

[0007] The purpose of the utility model is to provide a vertical granulation kettle for granulating graphite negative electrode materials, which has the advantages of good stirring effect, sufficient mixing, short secondary granulation time, etc., and solves the problem of low secondary granulation efficiency caused by poor stirring effect in the prior art.

[0008] The utility model adopts the following technical scheme: a vertical granulation kettle for granulating graphite negative electrode materials, comprising a granulation kettle body, the upper end surface of the granulation kettle body is provided with a feeding device, the lower end surface of the granulation kettle body is provided with a discharging device, a driving device is provided above the granulation kettle body, the output end of the driving device is connected to the stirring device in the granulation kettle body, and the stirring device is provided with an adjusting device, which is used to drive the stirring device to intermittently move up and down when the driving device drives the stirring device to rotate.

[0009] Furthermore, the stirring device includes a vertical shaft arranged in the granulation kettle body along the vertical direction, the top end of the vertical shaft is connected to the output end of the driving device, the stirring device also includes a sleeve slidably arranged on the outer surface of the vertical shaft along the vertical direction, and a stirring component fixedly arranged on the outer surface of the sleeve, and the stirring component is located in the granulation kettle body; the adjusting device is used to drive the sleeve to move up and down intermittently.

[0010] Furthermore, the discharging device includes a discharging tray fixedly arranged on the lower end surface of the granulation kettle body and a discharging pipe fixedly arranged on the lower end surface of the discharging tray, a discharging valve is installed on the discharging pipe, a discharging hole connected to the interior of the discharging pipe is coaxially opened inside the discharging tray, the upper end surface of the discharging tray is a conical surface, the adjusting device includes a plurality of protrusions fixedly arranged along the circumferential direction on the conical surface of the discharging tray, the upper end surface of the protrusion is an arc surface, and a support portion corresponding to the protrusion is fixedly arranged on the lower part of the outer surface of the sleeve, and the lower end surface of the support portion is an arc surface.

[0011] Furthermore, a plurality of limit bolts are radially arranged on the sleeve, the limit bolts are threadedly connected to the sleeve, a sliding groove is provided in the vertical direction at a position corresponding to the limit bolt on the outer surface of the vertical shaft, the inner end of the limit bolt extends into the sliding groove, and the sleeve is slidably connected to the vertical shaft in the up and down directions through the limit bolts and the sliding groove.

[0012] Furthermore, a bottom plate is fixedly provided on the upper end surface of the sleeve, a top plate is fixedly provided on the outer surface of the vertical shaft located above the bottom plate, a return spring is sleeved on the vertical shaft between the top plate and the bottom plate, the top end of the return spring is fixedly provided on the top plate, and the bottom end of the return spring is fixedly provided on the bottom plate.

[0013] Furthermore, the stirring assembly includes an inner spiral blade fixed to the sleeve in the up and down directions and an outer spiral blade fixed to the inner spiral blade through a support column. The pitch directions of the inner spiral blade and the outer spiral blade are opposite and are separated by a set distance.

[0014] Furthermore, a wing plate is fixedly provided on the outer surface of the sleeve in the vertical direction, a plurality of notches are opened on the inner side wall of the inner spiral piece, and two ear plates are fixedly provided on the inner spiral piece corresponding to the notches.

[0015] Furthermore, the support column is arranged at the intersection of the inner spiral plate and the outer spiral plate, the outer end of each support column is fixed to the outer spiral plate, and the inner end of each support column is fixed to the inner spiral plate, and the outer spiral plate and the inner spiral plate are separated by a set distance.

[0016] Furthermore, the feeding device includes a metering tank and a feeding pipe connecting the metering tank with the interior of the granulation kettle body, and a high-temperature electric heating furnace is fixedly installed at the bottom end of the discharge pipe.

[0017] Furthermore, the high-temperature electric heating furnace is fixedly arranged in the bottom frame, the upper end surface of the bottom frame is fixedly provided with an intermediate platform, the granulation kettle body is fixedly arranged in the intermediate platform, the upper end surface of the intermediate platform is fixedly provided with an upper frame, and the metering tank is fixedly arranged in the upper frame; the driving device includes a motor fixedly arranged with the upper frame, and the output end of the motor is fixedly arranged with the top end of the vertical shaft.

[0018] 1. The utility model is provided with a driving device, a stirring device and an adjusting device. When the device is used, the driving device drives the stirring device to rotate, so that the stirring device stirs the material in the granulation kettle body. At the same time, the adjusting device forces the stirring device to move intermittently up and down in the granulation kettle body, so that the graphite negative electrode material is subjected to radial stirring and generates up and down disturbances, which increases the stirring vortex of the graphite negative electrode material, improves the stirring effect, and thus improves the granulation efficiency of the graphite negative electrode material.

[0019] 2. The utility model is provided with a sleeve, a discharge pipe, a discharge plate, a protrusion and a support part. When in use, the driving device drives the sleeve to rotate through the vertical shaft, and the sleeve drives the support part to rotate. When the support part is located between the two protrusions, the sleeve moves downward under the action of gravity, so that each support part enters between the two protrusions and contacts the conical surface of the discharge plate. As the sleeve rotates, the support part is lifted by the protrusion, thereby causing the sleeve to move upward, and the sleeve drives the stirring assembly to move upward. When the support part is again between the two protrusions, the sleeve moves downward again under the action of gravity, so that each support part enters between the two protrusions and contacts the conical surface of the discharge plate. This cycle is repeated to achieve the purpose of the sleeve moving up and down intermittently while rotating, thereby achieving the purpose of the sleeve driving the stirring assembly to move up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 This is a front view structural diagram of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the granulation kettle in the utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the granulation kettle in the present utility model;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the vertical shaft in the utility model;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the return spring in the utility model;

[0026] Figure 7 Schematic diagram of the three-dimensional structure of the outer spiral plate in the present invention;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the support column in the present utility model;

[0028] Figure 9 This is a schematic diagram of the three-dimensional structure of the top plate in the present utility model;

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of the bottom plate in the present utility model;

[0030] Figure 11 Schematic diagram of the three-dimensional structure of the inner spiral sheet in the present invention;

[0031] Figure 12 This is a schematic diagram of the three-dimensional structure of the discharge tray in the present utility model;

[0032] Figure 13 This is a schematic diagram of the three-dimensional structure inside the casing in the present invention;

[0033] Figure 14 This is a schematic diagram of the three-dimensional structure of the wing plate in the present utility model;

[0034] Figure 15 For the utility model Figure 14 A schematic diagram of the structure at point A in the figure.

[0035] In the figure, 1. granulating kettle body; 2. vertical shaft; 3. sleeve; 4. discharge tray; 5. discharge pipe; 6. discharge valve; 7. discharge hole; 8. raised part; 9. support part; 10. limit bolt; 11. slide groove; 12. bottom plate; 13. top plate; 14. return spring; 15. inner spiral sheet; 16. outer spiral sheet; 17. support column; 18. wing plate; 19. notch; 20. ear plate; 21. metering tank; 22. feed pipe; 23. high-temperature electric heating furnace; 24. bottom frame; 25. middle platform; 26. upper frame; 27. motor. DETAILED DESCRIPTION

[0036] See also Figure 1-15 The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0037] The vertical granulation kettle for granulating graphite negative electrode materials described in the utility model includes a granulation kettle body 1, the upper end surface of the granulation kettle body 1 is provided with a feeding device, the lower end surface of the granulation kettle body 1 is provided with a discharging device, and a driving device is provided above the granulation kettle body 1. The output end of the driving device is connected to the stirring device in the granulation kettle body 1, and the stirring device is provided with an adjusting device. The adjusting device is used to drive the stirring device to intermittently move up and down when the driving device drives the stirring device to rotate, so as to improve the stirring effect.

[0038] During use, the graphite negative electrode material and the binder are fed into the granulation kettle body 1 through the feeding device, and the driving device drives the stirring device to rotate, so that the stirring device stirs the material in the granulation kettle body 1, and at the same time the adjusting device forces the stirring device to move intermittently up and down in the granulation kettle body 1, so that the graphite negative electrode material is subjected to radial stirring while generating up and down disturbances, which increases the stirring vortex of the graphite negative electrode material, improves the stirring effect, and thus improves the granulation efficiency of the graphite negative electrode material; the graphite negative electrode material and the binder are fully mixed to slowly form particles of a set size, realizing secondary granulation, taking into account both energy density and rate performance, and asphalt is used as the binder; how to achieve secondary particles of a set size by granulation is a secondary granulation technology, which is mainly determined by the addition ratio of the binder and will not be elaborated here.

[0039] In this embodiment, the stirring device includes a vertical shaft 2 arranged in the granulation kettle body 1 along the vertical direction, the top of the vertical shaft 2 is connected to the output end of the driving device, the stirring device also includes a sleeve 3 slidably arranged on the outer surface of the vertical shaft 2 in the vertical direction, and a stirring component fixedly arranged on the outer surface of the sleeve 3, and the stirring component is located in the granulation kettle body 1; the adjusting device is used to drive the sleeve 3 to move up and down intermittently; when in use, the driving device drives the vertical shaft 2 to rotate, and the vertical shaft 2 drives the stirring component to rotate through the sleeve 3, so that the stirring component stirs and granulates the negative electrode material and asphalt in the granulation kettle body 1, and at the same time, the adjusting device drives the sleeve 3 to move up and down in the granulation kettle body 1, so that the sleeve 3 moves up and down while rotating, so as to drive the stirring component to rotate and move up and down intermittently, so as to improve the stirring effect, thereby improving the mixing efficiency of the negative electrode material and asphalt, and improving the efficiency of the secondary granulation of the graphite negative electrode material.

[0040] In this embodiment, the discharging device includes a discharging tray 4 fixedly arranged on the lower end surface of the granulating kettle body 1 and a discharging pipe 5 fixedly arranged on the lower end surface of the discharging tray 4, a discharging valve 6 is installed on the discharging pipe 5, and a discharging hole 7 connected to the interior of the discharging pipe 5 is coaxially opened inside the discharging tray 4. The upper end surface of the discharging tray 4 is a conical surface, and the adjusting device includes a plurality of protrusions 8 fixedly arranged along the circumferential direction of the conical surface of the discharging tray 4, and the upper end surface of the protrusion 8 is an arc surface. A support part 9 corresponding to the protrusion 8 is fixedly provided on the lower part of the outer surface of the sleeve 3, and the lower end surface of the support part 9 is an arc surface; when in use, the driving device drives the sleeve 3 to rotate through the vertical shaft 2, and the sleeve 3 drives the support part 9 to rotate. When the support part 9 is rotated, the driving device drives the sleeve 3 to rotate through the vertical shaft 2. When the support portion 9 is between the two protrusions 8, the sleeve 3 moves downward under the action of gravity, so that each support portion 9 enters between the two protrusions 8 and contacts the conical surface of the discharge tray 4. As the sleeve 3 rotates, the support portion 9 is lifted by the protrusion 8, thereby causing the sleeve 3 to move upward, and the sleeve 3 drives the stirring assembly to move upward. When the support portion is between the two protrusions 8 again, the sleeve 3 moves downward again under the action of gravity, so that each support portion 9 enters between the two protrusions 8 and contacts the conical surface of the discharge tray 4. This cycle is repeated to achieve the purpose of the sleeve 3 moving up and down intermittently while rotating, thereby achieving the purpose of the sleeve 3 driving the stirring assembly to move up and down.

[0041] When the cam 11 is in the upright position, the cam 11 is in the upright position, and the cam 11 is in the upright position, so that the cam 11 can move upward and downward, and the cam 11 can move along the cam 12 to the left.

[0042] In this embodiment, a bottom plate 12 is fixedly provided on the upper end surface of the sleeve 3, and a top plate 13 is fixedly provided on the outer surface of the vertical shaft 2 located above the bottom plate 12. A return spring 14 is sleeved on the vertical shaft 2 between the top plate 13 and the bottom plate 12. The top end of the return spring 14 is fixed to the top plate 13, and the bottom end of the return spring 14 is fixed to the bottom plate 12. When in use, the driving device drives the sleeve 3 to rotate through the vertical shaft 2, and the sleeve 3 moves up and down through the support part 9 and the protrusion 8. When the sleeve 3 moves downward due to gravity, the return spring 14 pushes the sleeve 3 to move downward, and the return spring 14 increases the driving force for the sleeve 3 to move downward.

[0043] In this embodiment, the stirring assembly includes an inner spiral piece 15 fixedly arranged with the sleeve 3 in the up and down direction and an outer spiral piece 16 fixedly arranged with the inner spiral piece 15 through a support column 17. The pitch directions of the inner spiral piece 15 and the outer spiral piece 16 are opposite and separated by a set spacing; when the driving device drives the inner spiral piece 15 and the outer spiral piece 16 to rotate through the vertical shaft 2 and the sleeve 3, the rotation of the inner spiral piece 15 has a lifting effect on the graphite negative electrode material, while the rotation of the outer spiral piece 16 has a downward pressing effect on the graphite negative electrode material. The inner spiral piece 15 and the outer spiral piece 16 stir the graphite negative electrode material while generating an internal circulation of the graphite negative electrode material up and down, increasing the eddy current of the material and improving the stirring effect; the inner spiral piece 15 and the outer spiral piece 16 simultaneously follow the intermittent movement of the sleeve 3 up and down, so that the inner spiral piece 15 and the outer spiral piece 16 graphite negative electrode material are lifted and pressed down as a whole, further enhancing the eddy current of the graphite negative electrode material and further improving the stirring effect.

[0044] In this embodiment, a wing plate 18 is fixedly provided on the outer surface of the sleeve 3 in the vertical direction, a plurality of notches 19 are opened on the inner side wall of the inner spiral plate 15, and two ear plates 20 are fixedly provided on the inner spiral plate 15 corresponding to the notches 19; during installation, the inner spiral plate 15 is put on the outside of the sleeve 3, and the wing plates 18 are inserted into the corresponding notches 19, and then the ear plates 20 and the wing plates 18 are fixed by tightening bolts, thereby achieving the purpose of fixing the inner spiral plate 15 and the sleeve 3.

[0045] In this embodiment, the support column 17 is arranged at the intersection of the inner spiral plate 15 and the outer spiral plate 16. The outer end of each support column 17 is fixed to the outer spiral plate 16, and the inner end of each support column 17 is fixed to the inner spiral plate 15. The outer spiral plate 16 and the inner spiral plate 15 are separated by a set distance.

[0046] In this embodiment, the feeding device includes a metering tank 21 and a feeding pipe 22 connecting the metering tank 21 with the interior of the granulation kettle body 1. A high-temperature electric furnace 23 is fixedly provided at the bottom end of the discharge pipe 5. The graphite negative electrode material of the secondary granulation enters the high-temperature electric furnace 23 for heating and graphitization by opening the discharge valve 6, and then enters the cooling kettle for cooling. The cooling kettle is shown in the figure, thereby completing the purpose of secondary granulation.

[0047] In this embodiment, the high-temperature electric heating furnace 23 is fixedly arranged in the bottom frame 24, the upper end surface of the bottom frame 24 is fixedly provided with an intermediate platform 25, the granulation kettle body 1 is fixedly arranged in the intermediate platform 25, the upper end surface of the intermediate platform 25 is fixedly provided with an upper frame 26, and the metering tank 21 is fixedly arranged in the upper frame 26.

[0048] In this embodiment, the driving device includes a motor 27 fixed to the upper frame 26, and the output end of the motor 27 is fixed to the top of the vertical shaft 2. When the motor 27 is started, it drives the vertical shaft 2 to rotate, and the vertical shaft 2 drives the inner spiral plate 15 and the outer spiral plate 16 to rotate through the sleeve 3.

[0049] In this embodiment, a plurality of scrapers 28 are fixedly provided on the outer surfaces of the inner spiral blade 15 and the outer spiral blade 16. When the support portion 9 enters between the two protrusions 8 and contacts the conical surface of the discharge tray 4, the outer surface of each scraper 28 contacts the inner side wall of the granulation kettle body 1.

[0050] The working principle of the present invention is as follows: the graphite negative electrode material and the binder are put into the granulation kettle body 1 through the metering tank 21, and then the motor 27 is started to drive the inner spiral piece 15 and the outer spiral piece 16 to rotate, so that the inner spiral piece 15 and the outer spiral piece 16 stir the graphite negative electrode material. At the same time, the rotation of the inner spiral piece 15 has a lifting effect on the graphite negative electrode material, and the rotation of the outer spiral piece 16 has a downward pressing effect on the graphite negative electrode material. While the inner spiral piece 15 and the outer spiral piece 16 stir the graphite negative electrode material, they can generate an internal circulation of the graphite negative electrode material up and down, increase the eddy current of the material, and improve the stirring effect. The inner spiral piece 15 and the outer spiral piece 16 follow the intermittent movement of the sleeve 3 up and down at the same time, so that the inner spiral piece 15 and the outer spiral piece 16 graphite negative electrode material are lifted and pressed down as a whole, further enhancing the eddy current of the graphite negative electrode material and further improving the stirring effect.

Claims

1. A vertical granulation kettle for granulating graphite negative electrode materials, comprising a granulation kettle body (1), a feeding device provided on the upper end surface of the granulation kettle body (1), a discharging device provided on the lower end surface of the granulation kettle body (1), and a driving device provided above the granulation kettle body (1), characterized in that: The output end of the driving device is connected to the stirring device in the granulation kettle body (1), and the stirring device is provided with an adjusting device, which is used to drive the stirring device to move up and down intermittently when the driving device drives the stirring device to rotate.

2. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 1, characterized in that: The stirring device comprises a vertical shaft (2) arranged in a vertical direction inside a granulating kettle body (1), the top end of the vertical shaft (2) is connected to the output end of a driving device, the stirring device further comprises a sleeve (3) slidably arranged on the outer surface of the vertical shaft (2) in a vertical direction, and a stirring component fixedly arranged on the outer surface of the sleeve (3), the stirring component being located inside the granulating kettle body (1); and the regulating device is used to drive the sleeve (3) to intermittently move up and down.

3. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 2, characterized in that: The discharging device comprises a discharging tray (4) fixedly arranged on the lower end surface of the granulating kettle body (1) and a discharging pipe (5) fixedly arranged on the lower end surface of the discharging tray (4), a discharging valve (6) is installed on the discharging pipe (5), a discharging hole (7) is coaxially opened inside the discharging tray (4) and communicated with the inside of the discharging pipe (5), the upper end surface of the discharging tray (4) is a conical surface, the adjusting device comprises a plurality of protrusions (8) fixedly arranged on the conical surface of the discharging tray (4) along the circumferential direction, the upper end surface of the protrusion (8) is an arc surface, and a support portion (9) corresponding to the protrusion (8) is fixedly arranged on the lower part of the outer surface of the sleeve (3), and the lower end surface of the support portion (9) is an arc surface.

4. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 3, characterized in that: A plurality of limiting bolts (10) are radially arranged on the sleeve (3), the limiting bolts (10) are threadedly connected to the sleeve (3), a sliding groove (11) is provided in the vertical direction at a position corresponding to the limiting bolts (10) on the outer surface of the vertical shaft (2), the inner end of the limiting bolt (10) extends into the sliding groove (11), and the sleeve (3) is slidably connected to the vertical shaft (2) in the upper and lower directions through the limiting bolts (10) and the sliding groove (11).

5. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 3, characterized in that: A bottom plate (12) is fixedly provided on the upper end surface of the sleeve (3), a top plate (13) is fixedly provided on the outer surface of the vertical shaft (2) located above the bottom plate (12), a return spring (14) is sleeved on the vertical shaft (2) between the top plate (13) and the bottom plate (12), the top end of the return spring (14) is fixedly provided on the top plate (13), and the bottom end of the return spring (14) is fixedly provided on the bottom plate (12).

6. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 2, characterized in that: The stirring assembly comprises an inner spiral piece (15) fixedly arranged with the sleeve (3) in the up-down direction and an outer spiral piece (16) fixedly arranged with the inner spiral piece (15) via a support column (17), wherein the pitch directions of the inner spiral piece (15) and the outer spiral piece (16) are opposite and are spaced apart by a set distance.

7. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 6, characterized in that: The outer surface of the sleeve (3) is fixedly provided with a wing plate (18) in the vertical direction, the inner side wall of the inner spiral piece (15) is provided with a plurality of notches (19), and two ear plates (20) are fixedly provided on the inner spiral piece (15) corresponding to the notches (19).

8. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 6, characterized in that: The support column (17) is arranged at the intersection of the inner spiral sheet (15) and the outer spiral sheet (16), the outer end of each support column (17) is fixedly arranged with the outer spiral sheet (16), the inner end of each support column (17) is fixedly arranged with the inner spiral sheet (15), and the outer spiral sheet (16) and the inner spiral sheet (15) are spaced at a set distance.

9. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 1, characterized in that: The feeding device comprises a metering tank (21) and a feeding pipe (22) connecting the metering tank (21) with the interior of the granulation kettle (1), and a high-temperature electric heating furnace (23) is fixedly provided at the bottom end of the discharge pipe (5).

10. The vertical granulation kettle for granulating graphite negative electrode materials according to claim 9, characterized in that: The high-temperature electric heating furnace (23) is fixedly arranged in the bottom frame (24), the upper end surface of the bottom frame (24) is fixedly provided with an intermediate platform (25), the granulation kettle body (1) is fixedly arranged in the intermediate platform (25), the upper end surface of the intermediate platform (25) is fixedly provided with an upper frame (26), and the metering tank (21) is fixedly arranged in the upper frame (26); the driving device includes a motor (27) fixedly arranged with the upper frame (26), and the output end of the motor (27) is fixedly arranged with the top end of the vertical shaft (2).

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