Preparation method and device of high-capacity and high-compaction fast-charging power battery negative electrode material

Abstract

The invention is suitable for the technical field of negative electrode material product manufacturing, and provides a preparation method and device of a high-capacity and high-compaction fast-charging power battery negative electrode material. The negative electrode material preparation system is composed of a feeding station, a group of vacuum conveyors, a mixer, a feed weighing bin, a low-temperature roller furnace, a medium-temperature roller furnace, a high-temperature roller furnace, a cooling kettle, a discharge weighing bin, a scattering shaper and a pulverizer. And the vacuum conveyors are respectively arranged at the feeding station, the low-temperature roller furnace and the discharging and weighing stock bin and are used for conveying negative electrode materials. According to the high-capacity and high-compaction fast-charging power battery negative electrode material preparation equipment and method provided by the scheme, needle coke or medium sulfur coke which is easy to graphitize is adopted, and the continuous drum furnace is used for semi-calcination and granulation, so that the gram volume and the compaction density of an artificial graphite negative electrode material can be effectively improved; therefore, the purpose of improving the unit volume energy density of the power battery is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of negative electrode material product manufacturing, and in particular relates to a method and device for preparing a high-capacity and high-density fast-charging power battery negative electrode material. Background Art

[0002] With the rapid development of new energy vehicles, people have higher and higher requirements for the fast charging performance and endurance of new energy vehicles; however, with the increasing maturity of artificial graphite negative electrode materials, the capacity of artificial graphite is getting closer and closer to its theoretical maximum capacity, and the compaction density is approaching the limit, which makes it more difficult to improve endurance and fast charging. Summary of the invention

[0003] The present invention provides a method and device for preparing a high-capacity and high-compacting fast-charging power battery negative electrode material, aiming to solve the problem raised in the above background technology that the currently available negative electrode material preparation equipment is difficult to improve the capacity and compaction performance of the negative electrode material.

[0004] To solve the above problems, the present invention is implemented as follows: a method and device for preparing high-capacity and high-pressure fast-charging power battery negative electrode materials, including: a negative electrode material preparation system, the negative electrode material preparation system consists of a feeding station, a group of vacuum conveyors, a mixer, a feed weighing bin, a low-temperature roller furnace, a medium-temperature roller furnace, a high-temperature roller furnace, a cooling kettle, a discharge weighing bin, a scattering and shaping machine and a pulverizer, each of the vacuum conveyors is respectively arranged at the feeding station, the low-temperature roller furnace and the discharge weighing bin for conveying negative electrode materials; the feed weighing bin is composed of a feed station, a group of vacuum conveyors, a mixer, a feed weighing bin, a low-temperature roller furnace, a medium-temperature roller furnace, a high-temperature roller furnace, a cooling kettle, a discharge weighing bin, a scattering and shaping machine and a pulverizer, and each of the vacuum conveyors is respectively arranged at the feeding station, the low-temperature roller furnace and the discharge weighing bin for conveying negative electrode materials; the feed weighing bin is composed of a feed station, a low-temperature roller furnace and a medium-temperature roller furnace, a high-temperature roller furnace, a cooling kettle, a discharge weighing bin, a scattering and shaping machine and a pulverizer. A silo is provided below the mixer for weighing materials, and the feed weighing silo conveys materials to the low-temperature roller furnace through a vacuum conveyor; the low-temperature roller furnace is used to semi-calcine the materials; the two feed ends of the medium-temperature roller furnace and the high-temperature roller furnace are respectively connected to the feed ends of the low-temperature roller furnace and the cooling kettle through pipelines; the cooling kettle conveys materials to the discharge weighing silo through a vacuum conveyor, and the scattering and shaping machine is provided on one side of the discharge weighing silo; the crusher is provided on one side of the medium-temperature roller furnace for crushing materials.

[0005] Preferably, a support plate is installed in the crusher, a reinforcing steel plate is installed on the support plate, a group of grinding chambers are provided on the reinforcing steel plate, each of the grinding chambers is provided with a grinding roller for crushing materials, a driving mechanism is provided on the crusher for driving a group of grinding rollers to rotate; and a scraping mechanism is provided in the crusher for centralized material discharge.

[0006] Preferably, the crusher consists of a shell and a cover plate, a mounting groove is provided on the top of the shell, a sealing strip is installed in the mounting groove, the sealing strip is in close contact with the bottom of the cover plate, mounting plates are installed on one side of the shell and the cover plate, fastening bolts are threadedly installed on two mounting plates, and a hook is installed on the top of the cover plate.

[0007] Preferably, the driving mechanism includes: a connecting rod rotatably mounted on the cover plate, the connecting rod and the grinding roller are connected by a fixing bolt, a first sprocket is fixedly sleeved on the connecting rod, a first chain is sleeved on the first sprocket, the first chain is meshed with the first sprocket, a servo motor is fixedly mounted on the top of the cover plate, and the output shaft of the servo motor is fixedly connected to the connecting rod.

[0008] Preferably, a protective cover is fixedly installed on the top of the inner wall of the cover plate, the protective cover is U-shaped, a plurality of limiting wheels are installed in the protective cover, the plurality of limiting wheels are used to limit the first chain, a group of annular cooling chambers for cooling the grinding chamber are opened on the support plate, and a circulating water pipe for connecting a group of the annular cooling chambers is installed on the grinder.

[0009] Preferably, the scraper mechanism includes: a group of second sprockets rotatably installed in the crusher, the group of second sprockets is arranged below the support plate; a second chain mounted on the group of second sprockets, the second chain is meshed with the group of second sprockets; a connecting member installed on the second chain; a scraper assembled at the rotating end of the connecting member, and a guide rod for guiding the scraper is installed in the crusher.

[0010] On the other hand, a method for preparing a high-capacity and high-density fast-charging power battery negative electrode material is provided, comprising the following preparation steps:

[0011] Step 1:

[0012] Using graphitizable needle coke or medium-sulfur coke as raw material A, the raw material A is fed into a feeding station 1, and transported to a low-temperature drum furnace 5 through a vacuum conveyor 2 for drying. The raw material A is then subjected to a coarse crushing and drying process to remove moisture from A, and A is converted into a granular material B of about 5 mm. The granular material B is then transported to a medium-temperature drum furnace 5 for semi-calcination to obtain a material C;

[0013] Step 2:

[0014] Material C is transported to the pulverizer 11 through the feeding equipment for grinding and shaping to obtain material D. Material D and asphalt auxiliary material E are evenly mixed according to (100:5-100:12), and then enter the high-temperature drum furnace 7 for granulation. After cooling, the material is dispersed and shaped to obtain material F. The particle size of material F is D50 = 15-21 microns;

[0015] When grinding and shaping, first, the material C is discharged into the pulverizer 11, and then discharged into the grinding chamber through the support plate 12, and the servo motor 18 is started, so that the output shaft of the servo motor 18 drives the connecting rod to rotate, and the connecting rod synchronously drives the grinding roller 13 to rotate, so that the grinding roller 13 grinds the material C in the grinding chamber, and the ground material D is discharged into the bottom of the inner wall of the shell through the grinding chamber, and then the scraper 25 scrapes the material D to one side of the discharge end of the pulverizer 11 to assist the discharge of the material D;

[0016] Step 3:

[0017] Material F is subjected to high-temperature graphitization (3000°C) to obtain material G. Material G and asphalt auxiliary material E are evenly mixed in the ratio of (100:1-100:3), and then enter into a roller kiln for high-temperature carbonization in an air-tight environment. The carbonization temperature is 1150±50°C. Material H is obtained after carbonization. Material H is subjected to mixing, screening, and demagnetization to obtain a high-capacity and high-compacted artificial graphite negative electrode material.

[0018] Preferably, the medium temperature drum furnace 6 described in step 1 has a rotation speed of 0.5 to 3 rpm, a heating temperature of 650 to 900° C., and a heating time of 6 to 10 h.

[0019] Preferably, the particle size of the material D in step 2 is D50=7-11 μm, the rotation speed of the high-temperature drum furnace 7 is 0.5-3 rpm, the heating temperature is 650-900° C., and the heating time is 6-10 h.

[0020] Preferably, the particle size of the material G in step three is D50=13-19 microns.

[0021] Preferably, a rotating rod is fixedly installed on one side of the crusher, two sets of second sprockets are provided in the crusher, a first output wheel is fixedly sleeved on any sprocket of the two sets of the second sprockets, a first belt is sleeved on the two first output wheels, a connecting gear is fixedly sleeved on the rotating rod and any one of the first output wheels, and the two connecting gears are meshed with each other.

[0022] Preferably, a connecting box is fixedly installed at the bottom of the protective cover, a connecting rod is rotatably installed on the connecting box, one end of the connecting rod passes through one side of the crusher, the connecting rod and the connecting rod are both fixedly sleeved with a bevel gear, the two bevel gears are meshed with each other, the crusher and any second sprocket output rod are provided with a second output wheel, the two second output wheels are sleeved with a second belt, the second output wheel located above and the connecting rod are both fixedly sleeved with a connecting gear, the two connecting gears are meshed with each other.

[0023] Compared with the related art, the high-capacity and high-density fast-charging power battery negative electrode material preparation device and method provided by the present invention have the following beneficial effects:

[0024] Compared with the prior art, the high-capacity and high-compactness fast-charging power battery negative electrode material preparation equipment and method provided in this solution can improve the capacity and compaction density of traditional negative electrode materials by semi-calcining and granulating through a continuous drum furnace. At the same time, by optimizing the preparation process of the negative electrode material, the battery life and fast charging performance of the power battery are improved. During the entire preparation process, vacuum conveyor 2, drum furnace, cooling kettle 8, scrambler 10 and crusher 11 and other equipment are used to achieve precise control and processing of raw materials, ensuring the quality and stability of the final product.

[0025] In summary, the high-capacity and high-compacted fast-charging power battery negative electrode material preparation equipment and method of the present invention can effectively improve the gram capacity and compaction density of artificial graphite negative electrode materials by using easily graphitized needle coke or medium-sulfur coke and a continuous drum furnace for semi-calcination and granulation, thereby achieving the purpose of increasing the energy density per unit volume of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structure of a high-capacity and high-compactness fast-charging power battery negative electrode material preparation device provided by the present invention;

[0027] Figure 2 This is a working flow chart of a method for preparing a high-capacity and high-density fast-charging power battery negative electrode material provided by the present invention;

[0028] Figure 3 It is a schematic diagram of the main cross-sectional structure of the pulverizer provided by the present invention;

[0029] Figure 4 It is a side cross-sectional structural schematic diagram of a pulverizer provided by the present invention;

[0030] Figure 5 It is a schematic diagram of the main structure of the pulverizer provided by the present invention;

[0031] Figure 6 It is a side structural schematic diagram of the pulverizer provided by the present invention;

[0032] Figure 7 The present invention provides a cooling water flow diagram in the cooling cavity;

[0033] Figure 8 It is an assembly diagram of the first sprocket, the first chain and the limiting wheel provided by the present invention;

[0034] Fig. 9 for Figure 4 An enlarged structural diagram of part A shown in FIG.

[0035] Fig.10 for Figure 4 Schematic diagram of the enlarged structure of part B shown in FIG.

[0036] Figure numerals: 1, feeding station; 2, vacuum conveyor; 3, mixer; 4, feeding weighing bin; 5, low temperature drum furnace; 6, medium temperature drum furnace; 7, high temperature drum furnace; 8, cooling kettle; 9, discharging weighing bin; 10, scattering and shaping machine; 11, crusher; 12, support plate; 13, grinding roller; 14, housing; 15, first sprocket; 16, first chain; 17, limit wheel; 18, servo motor; 19, protective cover ; 20. Annular cooling chamber; 21. Circulating water pipe; 22. Second sprocket; 23. Second chain; 24. Connecting piece; 25. Scraper; 26. Guide rod; 27. Rotating rod; 28. First output wheel; 29. ​​First belt; 30. Connecting gear; 31. Second output wheel; 32. Second belt; 33. Connecting box; 34. Connecting rod; 35. Bevel gear; 36. Connecting gear; 37. Reinforcement steel plate; 39. Hook. DETAILED DESCRIPTION

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The embodiment of the present invention provides a method and device for preparing a high-capacity and high-density fast-charge power battery negative electrode material, such as Figure 1-10As shown, the high-capacity and high-pressure compaction fast-charging power battery negative electrode material preparation equipment includes: a negative electrode material preparation system, the negative electrode material preparation system consists of a feeding station 1, a group of vacuum conveyors 2, a mixer 3, a feed weighing bin 4, a low-temperature roller furnace 5, a medium-temperature roller furnace 6, a high-temperature roller furnace 7, a cooling kettle 8, a discharge weighing bin 9, a scattering and shaping machine 10 and a crusher 11. Each of the vacuum conveyors 2 is respectively arranged at the feeding station 1, the low-temperature roller furnace 5 and the discharge weighing bin 9 for conveying negative electrode materials; the feed weighing bin 4 is arranged at the mixer 3 The lower part is used for weighing materials, and the feed weighing bin 4 conveys materials to the low-temperature roller furnace 5 through the vacuum conveyor 2; the low-temperature roller furnace 5 is used to semi-calcine the materials; the two feed ends of the medium-temperature roller furnace 6 and the high-temperature roller furnace 7 are respectively connected to the feed ends of the low-temperature roller furnace 5 and the cooling kettle 8 through pipelines; the cooling kettle 8 conveys materials to the discharge weighing bin 9 through the vacuum conveyor 2, and the scattering and shaping machine 10 is arranged on one side of the discharge weighing bin 9; the crusher 11 is arranged on one side of the medium-temperature roller furnace 6 for crushing materials.

[0040] In this embodiment, first, graphitizable needle coke or medium-sulfur coke is used as raw material A. After being fed into the feeding station 1, it is transported to the low-temperature drum furnace 5 by the vacuum conveyor 2 for drying to remove moisture in the raw material and coarsely crush it into granular material B of about 5 mm. Then, material B is transported to the medium-temperature drum furnace 6 for semi-calcination to obtain material C. Then, material C is ground and shaped by a pulverizer 11 to obtain material D. Material D is mixed evenly with asphalt auxiliary material E in a certain proportion and then enters the high-temperature drum furnace 7 for granulation. After the granulated material is cooled by the cooling kettle 8, it is broken up and shaped to obtain material F, and its particle size is controlled within the range of D50=15-21 microns.

[0041] Finally, material F is subjected to high-temperature graphitization treatment to obtain material G. Material G is mixed with asphalt auxiliary material E in a certain proportion and then enters a roller kiln for high-temperature carbonization treatment in an air-tight state. The carbonized material is subjected to mixing, screening, demagnetization and other processes to finally obtain a high-capacity and high-density artificial graphite negative electrode material. Semi-calcination and granulation in a continuous drum furnace can improve the capacity and compaction density of traditional negative electrode materials. At the same time, by optimizing the preparation process of negative electrode materials, the endurance and fast charging performance of power batteries are improved. In the entire preparation process, vacuum conveyors 2, drum furnaces, cooling kettles 8, shattering and shaping machines 10 and pulverizers 11 and other equipment are used to achieve precise control and processing of raw materials, ensuring the quality and stability of the final product.

[0042] In a further preferred embodiment of the present invention, a support plate 12 is installed in the crusher 11, a reinforcing steel plate 37 is installed on the support plate 12, a group of grinding chambers are provided on the reinforcing steel plate 37, each of the grinding chambers is provided with a grinding roller 13 for crushing materials, a driving mechanism is provided on the crusher 11 for driving the group of grinding rollers 13 to rotate; and a scraping mechanism is provided in the crusher 11 for centralized material discharge.

[0043] In this embodiment, material C is conveyed to the crusher 11 through a feeding device, and the grinding roller 13 rotates under the drive of the driving mechanism to crush the material entering the grinding chamber. At the same time, the crusher 11 is also equipped with a scraper mechanism, which is responsible for collecting and discharging the crushed material to ensure the continuity and efficiency of the crushing process. Material C is crushed to obtain material D. By adding a support plate 12 and a reinforcing steel plate 37, the overall strength and stability of the crusher are significantly improved, so that it can better adapt to high-intensity and long-term crushing operations. The grinding roller 13 rotates under the drive of the driving mechanism to efficiently crush the material. At the same time, the setting of the scraper mechanism ensures that the crushed material can be discharged in time, avoiding the accumulation and blockage of the material in the crusher, and further improving the crushing efficiency.

[0044] In a further preferred embodiment of the present invention, the crusher 11 is composed of a shell and a cover plate 14, the top of the shell is provided with a mounting groove, a sealing strip is installed in the mounting groove, the sealing strip is in close contact with the bottom of the cover plate 14, one side of the shell and the cover plate 14 are both provided with mounting plates, two of the mounting plates are threadedly provided with fastening bolts, and the top of the cover plate 14 is provided with a hook 39.

[0045] In this embodiment, when the grinding roller 13 needs to be replaced, first connect the hook 39 to the lifting equipment, then remove the fastening bolts, start the lifting equipment, and drive the lifting equipment to move the cover 14 so that the cover 14 is away from the top of the shell. Then, the grinding roller 13 can be replaced. After replacement, the cover 14 is placed on the top of the shell, and the sealing strip is in close contact with the bottom of the cover 14 to form an effective seal to prevent leakage of materials or dust during the crushing process. Then, tighten the fastening bolts to fix the cover 14 tightly on the shell to ensure the stability and sealing of the crusher. By installing the sealing strip, the close contact between the cover 14 and the shell is ensured, which effectively prevents the leakage of materials or dust during the crushing process, keeps the crusher clean and the working environment safe, and by installing the fastening bolts and the mounting plate, the cover 14 is firmly fixed on the shell, which improves the overall stability of the crusher and ensures the smooth progress of the crushing process.

[0046] In a further preferred embodiment of the present invention, the driving mechanism includes: a connecting rod rotatably mounted on the cover plate 14, the connecting rod is connected to the grinding roller 13 by a fixing bolt, a first sprocket 15 is fixedly sleeved on the connecting rod, a first chain 16 is sleeved on the first sprocket 15, the first chain 16 is meshed with the first sprocket 15, a servo motor 18 is fixedly mounted on the top of the cover plate 14, and the output shaft of the servo motor 18 is fixedly connected to the connecting rod.

[0047] In this embodiment, when the servo motor 18 is started, its output shaft will drive the connecting rod to rotate, and then drive multiple grinding rollers 13 to rotate synchronously through the sprocket chain structure to achieve material crushing. The servo motor 18 has the characteristics of high precision and high stability, and can achieve precise control of the rotation speed of the grinding roller 13, which helps to ensure that the material is evenly crushed during the crushing process and improve the quality and performance of the final product. The sprocket chain structure has the advantages of high transmission efficiency, strong load-bearing capacity, and easy maintenance.

[0048] In a further preferred embodiment of the present invention, a protective cover 19 is fixedly installed on the top of the inner wall of the cover plate 14, and the protective cover 19 is arranged in a U shape. A plurality of limiting wheels 17 are installed in the protective cover 19, and the plurality of limiting wheels 17 are used to limit the first chain 16. A group of annular cooling chambers 20 for cooling the grinding chamber are opened on the support plate 12, and a circulating water pipe 21 for connecting a group of the annular cooling chambers 20 is installed on the grinder 11.

[0049] In this embodiment, the limiting wheel 17 is used to limit and guide the first chain 16, so as to ensure that the first chain 16 can maintain stability and reliability during the transmission process, and to prevent the first chain 16 from rubbing or colliding with the cover plate 14 or other components due to shaking or deviation, thereby extending the service life of the first chain 16 and reducing the generation of noise;

[0050] When the grinding roller 13 is rotating at high speed to grind the material, a large amount of heat will be generated. If this heat is not dissipated in time, it will cause the temperature of the grinding roller 13 and the grinding chamber to rise, thereby affecting the grinding effect and the stability of the equipment. Therefore, by introducing cooling water into the annular cooling chamber 20, the heat in the grinding chamber can be taken away by the convection heat transfer principle of water, so as to achieve the cooling of the grinding chamber. The cooling water circulates in the annular cooling chamber 20, continuously absorbs and takes away the heat in the grinding chamber, and finally is discharged to the outside of the pulverizer 11 through the circulating water pipe 21. The circulating water pipe 21 is connected to the refrigeration unit, and then the cooling water is transported into the annular cooling chamber 20. By opening the annular cooling chamber 20 and connecting the circulating water pipe 21, the effective cooling of the grinding chamber is achieved, which helps to reduce the temperature of the grinding roller 13 and the grinding chamber, improve the grinding effect and the stability of the equipment, and at the same time extend the service life of the equipment.

[0051] In a further preferred embodiment of the present invention, the scraper mechanism includes: a group of second sprockets 22 rotatably installed in the crusher 11, and the group of second sprockets 22 is arranged below the support plate 12; a second chain 23 sleeved on the group of second sprockets 22, and the second chain 23 is meshed with the group of second sprockets 22; a connecting member 24 installed on the second chain 23; a scraper 25 assembled at the rotating end of the connecting member 24, and a guide rod 26 for guiding the scraper 25 is installed in the crusher 11.

[0052] In this embodiment, when the connecting member 24 is located above the second sprocket 22, the scraper 25 is in a suspended state, away from the bottom of the inner wall of the crusher 11, and will not interfere with the crushing process of the material. When the connecting member 24 is rotated to the bottom of the second sprocket 22 through the transmission of the second chain 23, the bottom of the scraper 25 contacts the bottom of the inner wall of the crusher 11, thereby scraping the material to the discharge end of the crusher 11. In order to ensure the stability and reliability of the scraper 25 during the scraping process, a guide rod 26 is also installed in the crusher 11. The guide rod 26 guides the scraper 25 so that it can scrape along a predetermined trajectory to avoid the scraper 25 from deviating or shaking during the scraping process. By adopting the sprocket chain transmission and the scraper 25 scraping method, the timely scraping and discharge of the crushed material is achieved, and the scraping efficiency and the overall working efficiency of the crusher are improved.

[0053] The present invention also provides a method for preparing a high-capacity and high-density fast-charging power battery negative electrode material, comprising the following steps:

[0054] Step 1:

[0055] Using graphitizable needle coke or medium-sulfur coke as raw material A, the raw material A is fed into a feeding station 1, and transported to a low-temperature drum furnace 5 through a vacuum conveyor 2 for drying. The raw material A is then subjected to a coarse crushing and drying process to remove moisture from A, and A is converted into a granular material B of about 5 mm. The granular material B is then transported to a medium-temperature drum furnace 5 for semi-calcination to obtain a material C;

[0056] Step 2:

[0057] Material C is transported to the pulverizer 11 through the feeding equipment for grinding and shaping to obtain material D. Material D and asphalt auxiliary material E are evenly mixed according to (100:5-100:12), and then enter the high-temperature drum furnace 7 for granulation. After cooling, the material is dispersed and shaped to obtain material F. The particle size of material F is D50 = 15-21 microns;

[0058] When grinding and shaping, first, the material C is discharged into the pulverizer 11, and then discharged into the grinding chamber through the support plate 12, and the servo motor 18 is started, so that the output shaft of the servo motor 18 drives the connecting rod to rotate, and the connecting rod synchronously drives the grinding roller 13 to rotate, so that the grinding roller 13 grinds the material C in the grinding chamber, and the ground material D is discharged into the bottom of the inner wall of the shell through the grinding chamber;

[0059] When the connecting rod rotates, it drives the bevel gear 35 to rotate, so that the bevel gear 35 drives the connecting rod 34 and the connecting gear 36 to rotate synchronously, and the second output wheel 31 is driven to rotate through the meshing action of a group of connecting gears 36, so that the second output wheel 31 drives the second sprocket 22 to rotate through the second belt 32, so that the second sprocket 22 drives the second chain 23 to rotate. When the second chain 23 rotates, the connecting member 24 drives the scraper 25 to move left and right, so that the scraper 25 scrapes the material D to one side of the discharging end of the crusher 11, and assists the material D in discharging;

[0060] Step 3:

[0061] Material F is subjected to high-temperature graphitization (3000°C) to obtain material G. Material G and asphalt auxiliary material E are evenly mixed in the ratio of (100:1-100:3), and then enter into a roller kiln for high-temperature carbonization in an air-tight environment. The carbonization temperature is 1150±50°C. Material H is obtained after carbonization. Material H is subjected to mixing, screening, and demagnetization to obtain a high-capacity and high-compacted artificial graphite negative electrode material.

[0062] In a further preferred embodiment of the present invention, the medium temperature drum furnace 6 described in step 1 has a rotation speed of 0.5 to 3 rpm, a heating temperature of 650 to 900° C., and a heating time of 6 to 10 hours.

[0063] In this embodiment, the speed of the medium temperature drum furnace 6 is set to 0.5-3rpm. This speed range can ensure that the material is fully rolled and mixed in the drum, and can avoid material wear and increased energy consumption caused by too high a speed; the heating temperature is set to 650-900°C, and this temperature range can ensure that the material is fully heated and softened in the drum, and can avoid burning or deterioration of the material caused by too high a temperature. Through reasonable temperature control, it can be ensured that the material forms a good particle structure during the heating process; the heating time is set to 6-10 hours, and this time period can ensure that the material is fully heated and granulated in the drum, and can avoid increased energy consumption and excessive aging of the material caused by too long a heating time. By optimizing the operating parameters of the medium temperature drum furnace 6, such as the speed, heating temperature and heating time, the granulation quality can be significantly improved. The formed granular material has a regular shape and stable performance, which is conducive to subsequent processing and use.

[0064] In a further preferred embodiment of the present invention, the particle size of the material D in step 2 is D50=7-11 μm, the rotation speed of the high-temperature drum furnace 7 is 0.5-3 rpm, the heating temperature is 650-900° C., and the heating time is 6-10 h.

[0065] In this embodiment, the particle size of material D is controlled within the range of D50=7~11μm. This particle size range can ensure that the material is fully heated and reacted in the drum furnace, and can avoid uneven heating or insufficient reaction caused by excessively large particle size. Through reasonable particle size control, the performance of the final product can be ensured to be stable and meet the requirements; the rotation speed of the high-temperature drum furnace 7 is set to 0.5~3rpm. This rotation speed range can ensure that the material is fully rolled and mixed in the drum, and can avoid material wear and increased energy consumption caused by excessively high rotation speed; the heating temperature is set to 650~900℃. This temperature range can ensure that the material is fully heated and reacted in the drum, such as sintering or carbonization, and can avoid burning or deterioration of the material caused by excessively high temperature; the heating time is set to 6~10 hours. This time period can not only ensure that the material is fully heated and reacted in the drum, but also avoid the increase of energy consumption and excessive aging of the material caused by too long heating time. By optimizing the particle size range of the material D and the operating parameters of the high-temperature drum furnace 7, the quality and performance of the final product can be significantly improved. For example, the sintering density, carbonization degree or electrical conductivity of the product can be improved. Reasonable operating parameters can ensure that the high-temperature drum furnace 7 can achieve efficient heating and reaction at a lower energy consumption, which helps to reduce production costs and improve the economy of the equipment.

[0066] In a further preferred embodiment of the present invention, the particle size of the material G described in step three is D50=13-19 microns.

[0067] In this embodiment, controlling the particle size range of material G can not only ensure the stability and uniformity of the material in subsequent processing or treatment, but also avoid performance degradation or processing difficulties caused by excessively large or small particle sizes. At the same time, it can significantly improve the performance of the final product, such as improving the product's electrical conductivity, thermal conductivity or mechanical strength, etc. The improvement of these properties is crucial to the battery life and fast charging performance of new energy vehicle power batteries.

[0068] In order to further improve the use effect of the device, in addition to the above scheme, this scheme also has the following embodiments:

[0069] In another embodiment of the present invention, a rotating rod 27 is fixedly installed on one side of the pulverizer 11, and two groups of second sprockets 22 are provided in the pulverizer 11. A first output wheel 28 is fixedly sleeved on any sprocket of the two groups of the second sprockets 22, and a first belt 29 is sleeved on the two first output wheels 28. A connecting gear 30 is fixedly sleeved on the rotating rod 27 and any one of the first output wheels 28, and the two connecting gears 30 are meshed with each other.

[0070] In this embodiment, when the grinding roller 13 rotates, the rotating rod 27 rotates at the same time. The rotation of the rotating rod 27 drives the rotation of the connecting gear 30 connected thereto, and this connecting gear 30 transmits the rotational power to the other first output wheel 28 by meshing with another connecting gear 30. In this way, the two first output wheels 28 achieve synchronous rotation. Since the two first output wheels 28 are connected by the first belt 29, this synchronous rotation will also drive the synchronous rotation of the two second sprocket wheels 22. The two sets of second sprocket wheels 22 drive the scraper 25 to move, which is used to scrape the material inside the crusher 11. By achieving the synchronous rotation of the two sets of second sprocket wheels 22, it can be ensured that the scraper 25 can move smoothly and continuously, thereby improving the working efficiency and stability of the crusher 11.

[0071] In another embodiment of the present invention, a connecting box 33 is fixedly installed at the bottom of the protective cover 19, and a connecting rod 34 is rotatably installed on the connecting box 33. One end of the connecting rod 34 passes through one side of the crusher 11. The connecting rod 34 and the connecting rod are both fixedly sleeved with a bevel gear 35, and the two bevel gears 35 are meshed with each other. The crusher 11 and any second sprocket 22 output rod are provided with a second output wheel 31, and the two second output wheels 31 are sleeved with a second belt 32. The second output wheel 31 located above and the connecting rod 34 are both fixedly sleeved with a connecting gear 36, and the two connecting gears 36 are meshed with each other.

[0072] In this embodiment, when the grinding roller 13 rotates, its power is transmitted to the bevel gear 35 through the connecting rod, thereby driving the connecting rod 34 to rotate. At the same time, a second output wheel 31 is set on the output rod of the crusher 11 and any second sprocket 22. The two second output wheels 31 are connected by a second belt 32 to form a belt transmission system. The connecting gear 36 is fixedly mounted on the second output wheel 31 and the connecting rod 34 at the top. The two connecting gears 36 are also meshed. When the connecting rod 34 rotates, it will drive the upper connecting gear 36 to rotate. The connecting gear 36 drives the lower connecting gear 36 and the second output wheel 31 to rotate through the meshing action. Since the other second output wheel 31 is connected to the output rod of the second sprocket 22, this rotation will be further transmitted to the second sprocket 22, thereby driving the scraper 25 to slide back and forth inside the crusher 11.

[0073] In summary, compared with related technologies, this equipment can effectively increase the gram capacity and compaction density of artificial graphite negative electrode materials by using easily graphitized needle coke or medium-sulfur coke and a continuous drum furnace for semi-calcination and granulation, thereby achieving the purpose of increasing the energy density per unit volume of power batteries.

[0074] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A high-capacity and high-density fast-charge power battery negative electrode material preparation device, characterized in that: include: A negative electrode material preparation system, the negative electrode material preparation system comprises a feeding station (1), a group of vacuum conveyors (2), a mixer (3), a feeding weighing bin (4), a low-temperature roller furnace (5), a medium-temperature roller furnace (6), a high-temperature roller furnace (7), a cooling kettle (8), a discharging weighing bin (9), a scattering and shaping machine (10) and a pulverizer (11), wherein each of the vacuum conveyors (2) is respectively arranged at the feeding station (1), the low-temperature roller furnace (5) and the discharging weighing bin (9) for conveying materials; The feed weighing bin (4) is arranged below the mixer (3) for weighing materials, and the feed weighing bin (4) conveys materials to the low-temperature drum furnace (5) via a vacuum conveyor (2); The medium temperature drum furnace (6) is used to semi-calcine the material; The two feeding ends of the medium temperature roller furnace (6) and the high temperature roller furnace (7) are respectively connected to the feeding ends of the low temperature roller furnace (5) and the cooling kettle (8) through pipelines; The cooling kettle (8) conveys materials to a discharge weighing bin (9) via a vacuum conveyor (2), and the scattering and shaping machine (10) is arranged on one side of the discharge weighing bin (9); The pulverizer (11) is arranged on one side of the medium-temperature drum furnace (6) and is used for pulverizing materials.

2. The high-capacity and high-density fast-charge power battery negative electrode material preparation device according to claim 1, characterized in that: A support plate (12) is installed in the pulverizer (11), a reinforcing steel plate (37) is installed on the support plate (12), a group of grinding chambers are provided on the reinforcing steel plate (37), each group of grinding chambers is provided with a grinding roller (13) for crushing materials, a driving mechanism is provided on the pulverizer (11) for driving the group of grinding rollers (13) to rotate; and a scraping mechanism is provided in the pulverizer (11) for concentrated material discharge.

3. The high-capacity and high-density fast-charge power battery negative electrode material preparation device according to claim 2, characterized in that: The pulverizer (11) is composed of a shell and a cover plate (14). A mounting groove is provided on the top of the shell. A sealing strip is installed in the mounting groove. The sealing strip is in close contact with the bottom of the cover plate (14). Mounting plates are installed on one side of the shell and the cover plate (14). Fastening bolts are threadedly installed on two mounting plates. A hook (39) is installed on the top of the cover plate (14).

4. The high-capacity and high-density fast-charge power battery negative electrode material preparation device according to claim 3, characterized in that: The driving mechanism comprises: a connecting rod rotatably mounted on the cover plate (14), the connecting rod being connected to the grinding roller (13) via a fixing bolt, a first sprocket (15) being fixedly sleeved on the connecting rod, a first chain (16) being sleeved on the first sprocket (15), the first chain (16) being meshed with the first sprocket (15), a servo motor (18) being fixedly mounted on the top of the cover plate (14), and an output shaft of the servo motor (18) being fixedly connected to the connecting rod.

5. The high-capacity and high-density fast-charge power battery negative electrode material preparation device according to claim 4, characterized in that: A protective cover (19) is fixedly mounted on the top of the inner wall of the cover plate (14), the protective cover (19) is arranged in a U shape, a plurality of limiting wheels (17) are installed in the protective cover (19), and the plurality of limiting wheels (17) are used to limit the first chain (16), a group of annular cooling chambers (20) for cooling the grinding chamber are opened on the support plate (12), and a circulating water pipe (21) for connecting the group of annular cooling chambers (20) is installed on the pulverizer (11).

6. The high-capacity and high-density fast-charge power battery negative electrode material preparation device according to claim 5, characterized in that: The scraper mechanism comprises: a group of second sprockets (22) rotatably mounted in the crusher (11), the group of second sprockets (22) being arranged below the support plate (12); a second chain (23) sleeved on the group of second sprockets (22), the second chain (23) being meshed with the group of second sprockets (22); a connecting member (24) mounted on the second chain (23); and a scraper (25) mounted on the rotating end of the connecting member (24), wherein a guide rod (26) for guiding the scraper (25) is installed in the crusher (11).

7. The method for preparing a negative electrode material for a fast-charging power battery with high capacity and high compaction according to any one of claims 1 to 6, characterized in that: The method comprises the following preparation steps: Step 1: Using graphitizable needle coke or medium-sulfur coke as raw material A, the raw material A is fed into a feeding station (1), and transported to a low-temperature drum furnace (5) through a vacuum conveyor (2) for drying. The raw material A is then subjected to a coarse crushing and drying process to remove moisture from A, and A is converted into a granular material B of about 5 mm. The granular material B is then transported to a medium-temperature drum furnace (6) for semi-calcination to obtain a material C; Step 2: Material C is transported to a pulverizer (11) through a feeding device for grinding and shaping to obtain material D. Material D and asphalt auxiliary material E are evenly mixed in a ratio of (100:5-100:12), and then enter a high-temperature drum furnace (7) for granulation. After cooling, the material is dispersed and shaped to obtain material F. The particle size of material F is D50=15-21 microns. When grinding and shaping, first, the material C is discharged into the pulverizer 11, and then discharged into the grinding chamber through the support plate (12), and the servo motor (18) is started, so that the output shaft of the servo motor (18) drives the connecting rod to rotate, and the connecting rod synchronously drives the grinding roller (13) to rotate, so that the grinding roller (13) grinds the material C in the grinding chamber, and the ground material D is discharged into the bottom of the inner wall of the shell through the grinding chamber, and then the scraper (25) scrapes the material D to one side of the discharge end of the pulverizer (11), thereby assisting the discharge of the material D; Step 3: Material F is subjected to high-temperature graphitization (3000°C) to obtain material G. Material G and asphalt auxiliary material E are evenly mixed in the ratio of (100:1-100:3), and then enter into a roller kiln for high-temperature carbonization in an air-tight environment. The carbonization temperature is 1150±50°C. Material H is obtained after carbonization. Material H is subjected to mixing, screening, and demagnetization to obtain a high-capacity and high-compacted artificial graphite negative electrode material.

8. The method for preparing a negative electrode material for a fast-charging power battery with high capacity and high compaction as claimed in claim 7, characterized in that: The medium temperature drum furnace (6) described in step 1 has a rotation speed of 0.5 to 3 rpm, a heating temperature of 650 to 900° C., and a heating time of 6 to 10 hours.

9. The method for preparing a negative electrode material for a fast-charging power battery with high capacity and high compaction as claimed in claim 7, characterized in that: The particle size of the material D in step 2 is D50=7-11 μm, the rotation speed of the high-temperature drum furnace (7) is 0.5-3 rpm, the heating temperature is 650-900° C., and the heating time is 6-10 h.

10. The method for preparing a negative electrode material for a fast-charging power battery with high capacity and high compaction according to claim 7, characterized in that: The particle size of the material G described in step 3 is D50=13-19 microns.

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