An ultra-high performance negative electrode material coating system

Abstract

The present invention relates to the technical field of coating processing and production of hard carbon negative electrode materials, and in particular to an ultra-high performance negative electrode material coating system, comprising a coating kettle, a circulation mechanism, an extrusion dispersion mechanism and a dispersion barrier net; the circulation mechanism is connected to a discharge port at the bottom of a cavity and a top opening of a hollow flow channel on a stirring paddle, and the circulation mechanism circulates the negative electrode material in the cavity into the flow channel; the extrusion dispersion mechanism is installed on the upper part of the stirring paddle, the extrusion dispersion mechanism is located in the cavity, an extrusion bin of the extrusion dispersion mechanism is connected to the flow channel, when the stirring paddle rotates, the pressure in the extrusion bin fluctuates, and the negative electrode material flowing out of the flow channel is squeezed, so that the negative electrode material is ejected from the extrusion bin; the dispersion barrier net is arranged in the cavity, the dispersion barrier net is rigidly arranged, and the dispersion barrier net flattens the negative electrode material ejected by the extrusion dispersion mechanism, and filters out excess molten coating material on the surface of the negative electrode material.

Description

Technical Field

[0001] The invention relates to the technical field of coating processing and production of hard carbon negative electrode materials, and in particular to an ultra-high performance negative electrode material coating system. Background Art

[0002] Hard carbon negative electrode materials are mostly used in sodium ion batteries, lithium ion batteries and solid-state batteries. In the processing of hard carbon negative electrode materials, in order to improve the cycle stability of hard carbon negative electrode materials, improve the transmission rate of electrons and ions, reduce irreversible capacity loss, and improve conductivity, the hard carbon negative electrode materials will be coated. The so-called coating treatment is to coat a layer of specific substances on the surface of hard carbon, such as carbon materials, metal oxides, polymers, etc., which can effectively improve the conductivity of hard carbon, reduce electrode polarization, and enhance its cycle stability and rate performance. It can also inhibit the volume expansion of hard carbon during charging and discharging, reduce the damage to the electrode structure, and thus extend the service life of the battery.

[0003] The coating work of the hard carbon negative electrode material of the present application is aimed at the melt coating method of the hard carbon negative electrode material and the asphalt material, that is, the hard carbon material is immersed in the molten coating material, the molten coating material is wrapped on the surface of the hard carbon material, and then after cooling and solidification treatment, the molten coating material is solidified on the hard carbon surface to form a coating layer.

[0004] However, when the existing molten coating material is coated with the hard carbon negative electrode material, since the hard carbon negative electrode material is a powder and the molten coating material is mostly molten asphalt with poor fluidity, the hard carbon negative electrode material is very easy to agglomerate, resulting in the external molten coating material being difficult to enter the interior of the agglomerated hard carbon negative electrode material to coat it, and uniform mixing is difficult.

[0005] In the Chinese patent application number 202311556511.7, a graphite negative electrode material liquid phase coating device and coating process are disclosed, which belong to the field of natural graphite coating technology. The graphite negative electrode material liquid phase coating device mixes the natural graphite material with the liquid phase coating material by setting a dispersion structure, and throws the mixture out through a centrifugal tank, so that the mixture is fully dispersed, avoiding the natural graphite material and the liquid phase coating material from clumping and uneven coating.

[0006] However, in actual use, the above-mentioned liquid phase coating device has the following problems when used in melt coating work:

[0007] 1. When the filter cotton cloth is set to separate the natural graphite material and the molten coating material, the filter cotton cloth is not rigid and is easily deformed by impact. Correspondingly, when scraping the material later, there is also the problem of deformation of the filter cotton cloth, and the filter cotton cloth has a poor effect on the molten asphalt.

[0008] 2. When using a screw feeder to lift natural graphite and molten clad materials, there is a problem of difficulty in lifting, especially for the lifting of molten clad materials;

[0009] 3. For the centrifugal throwing out of natural graphite and molten coating materials, it is difficult to spray the hard carbon negative electrode material and the molten coating material onto the filter cotton cloth to form a scattered structure only by centrifugal throwing tank. Summary of the invention

[0010] In view of the above problems, the present invention provides an ultra-high performance negative electrode material coating system. By improving the dispersion barrier net, the dispersion barrier net can collide with the negative electrode material sprayed out by the extrusion dispersion mechanism to disperse the agglomerated negative electrode material, and cooperate with the pressure fluctuation pressurized injection of the extrusion dispersion mechanism to increase the initial injection velocity of the negative electrode material toward the dispersion barrier net, thereby improving the dispersion effect of the negative electrode material on the dispersion barrier net, so that the agglomerated negative electrode material is dispersed more thoroughly, which is more convenient for the subsequent molten coating material to coat the negative electrode material.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] An ultra-high performance negative electrode material coating system includes a coating kettle, wherein a cavity and a stirring paddle for coating the negative electrode material are provided in the coating kettle, and further includes:

[0013] Circulation mechanism, extrusion dispersion mechanism and dispersion barrier net;

[0014] The circulation mechanism is connected to the discharge port at the bottom of the cavity and the top opening of the hollow flow channel on the stirring paddle, and the circulation mechanism circulates the negative electrode material in the cavity into the flow channel;

[0015] The extrusion and dispersion mechanism is installed on the upper part of the stirring paddle, the extrusion and dispersion mechanism is located in the cavity, the extrusion chamber of the extrusion and dispersion mechanism is connected with the flow channel, when the stirring paddle rotates, the pressure in the extrusion chamber fluctuates, the negative electrode material flowing out of the flow channel is squeezed, and the negative electrode material is ejected from the extrusion chamber;

[0016] The dispersion barrier net is arranged in the cavity, and the dispersion barrier net is rigidly arranged. The dispersion barrier net spreads the negative electrode material ejected by the extrusion dispersion mechanism and filters out the excess molten coating material on the surface of the negative electrode material.

[0017] Preferably, the circulation mechanism is a screw pumping mechanism, which is connected to the discharge port via a three-way valve, and the three-way valve controls the switching of the output and circulation of the negative electrode material in the coating kettle.

[0018] Preferably, a plurality of intermittently opened discharge ports are provided on the side wall of the extrusion bin, and the negative electrode material is sprayed from the opened discharge ports onto the dispersion barrier net.

[0019] Preferably, a pressurizing piston is provided in the extrusion bin, and when the stirring paddle rotates, the pressurizing piston floats up and down along the side wall of the extrusion bin, thereby changing the size of the space in the extrusion bin, and then changing the pressure in the extrusion bin, so that the negative electrode material is ejected from the discharge port.

[0020] Preferably, when the pressurizing piston moves downward, it is driven by the rotation of the stirring paddle, and when the pressurizing piston moves upward to reset, it is driven by a stretched spring installed on the upper end surface of the pressurizing piston.

[0021] Preferably, a slidably arranged stopper is provided at the discharge port, and when the pressurizing piston moves downward to increase the pressure in the extrusion chamber, the stopper moves laterally to open the discharge port and spray out the negative electrode material.

[0022] Preferably, the lateral movement of the stopper is driven by the up and down floating of the pressurizing piston.

[0023] Preferably, the dispersion barrier net is shaped in a conformal manner to the cavity, the inner side of the dispersion barrier net facing the extrusion dispersion mechanism is a frameless structure, and the dispersion barrier net includes a rigid frame on the outer side and a ceramic filter membrane fitted on the inner side.

[0024] Preferably, a scraping mechanism is provided at the end of the stirring paddle near the dispersion barrier net for scraping and concentrating the dispersed negative electrode materials on the dispersion barrier net, and the scraping mechanism includes a plurality of scrapers and extrusion rollers equidistantly arranged around the stirring paddle, and the scrapers and the extrusion rollers rotate synchronously with the stirring paddle, and the extrusion rollers rotate while revolving.

[0025] Preferably, a melt channel is provided inside the extrusion roller, and a liquid outlet hole communicating with the melt channel is provided on the side wall of the extrusion roller;

[0026] A liquid inlet head connected to the melt channel is provided at the bottom of the extrusion roller. The liquid inlet head extends from the bottom of the extrusion roller, passes over the dispersion barrier net and is placed on the outside of the dispersion barrier net. The liquid inlet head guides the molten coating material filtered out by the dispersion barrier net into the melt channel, and the molten coating material is discharged through the liquid outlet.

[0027] The beneficial effects of the present invention are:

[0028] (1) The present invention sets the dispersion barrier net rigidly and increases the initial velocity of the negative electrode material ejected by the extrusion dispersion mechanism, so that the impact force of the negative electrode material on the dispersion barrier net is stronger, and the agglomerated negative electrode material is dispersed more thoroughly on the dispersion barrier net. When the subsequent molten coating material is used to coat the negative electrode material, it can better contact the negative electrode material, and the molten coating material can also be better distributed on the surface of the negative electrode material, forming a negative electrode material with higher coating quality and performance;

[0029] (2) The present invention improves the circulation mechanism and adopts a horizontally arranged screw pumping mechanism to circulate and transport the negative electrode material and the molten coating material. Since the negative electrode material is a powder and the molten coating material is a fluid with high viscosity and poor fluidity, the negative electrode material and the molten coating material can be continuously pushed forward by the horizontally arranged screw pumping mechanism and then lifted into the flow channel to achieve the purpose of circulation. In addition, in the second half of the circulation mechanism, a diameter reduction treatment is adopted to increase the pressure in the pipe for transporting the molten coating material, so that the molten coating material can be transported more smoothly.

[0030] (3) The present invention improves the extrusion dispersion mechanism so that the extrusion dispersion mechanism intermittently sprays out the negative electrode material, and the power of the spraying is changed to the change of the pressure inside the extrusion chamber. When the negative electrode material is sprayed out, the pressure inside the extrusion chamber is continuously increased, so that the spraying speed of the negative electrode material always maintains a relatively high initial speed level. In addition, the intermittent spraying leaves a processing operation time period for the negative electrode material to impact and disperse on the dispersion barrier net, thereby avoiding the continuous accumulation of the negative electrode material on the dispersion barrier net;

[0031] (4) The present invention provides a scraping mechanism on the dispersion barrier net, and utilizes the scraping mechanism to scrape off the negative electrode material scattered on the dispersion barrier net. The scraped negative electrode material will be rotated and extruded again by the extrusion roller to further disperse and unite the negative electrode material. At the same time, the molten coating material will flow out of the extrusion roller to re-coat the extruded negative electrode material, thereby forming a negative electrode coating material with better quality.

[0032] In summary, the present invention has the advantages of eliminating agglomeration of negative electrode materials and forming and coating negative electrode materials with high quality, and is particularly suitable for the coating processing and production technology field of hard carbon negative electrode materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0034] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of the coating kettle of the present invention;

[0036] Figure 4 It is a schematic diagram of the local structure of the coating kettle of the present invention;

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the stirring paddle of the present invention;

[0038] Figure 6 It is a schematic diagram of the three-dimensional structure of the rigid skeleton of the present invention;

[0039] Figure 7 It is a front view structural schematic diagram of the extrusion and dispersion mechanism of the present invention;

[0040] Figure 8 It is a schematic cross-sectional structure diagram of the extrusion and dispersion mechanism of the present invention;

[0041] Fig. 9 This is a schematic diagram of the fracture structure of the extrusion dispersion mechanism of the present invention;

[0042] Fig.10 This is a schematic diagram of the bottom structure of the extrusion and dispersion mechanism of the present invention;

[0043] Fig.11 The three-dimensional structure of the scraper mechanism of the present invention is shown in FIG. Figure 1 ;

[0044] Fig.12 The three-dimensional structure of the scraper mechanism of the present invention is shown in FIG. Figure 2 ;

[0045] Fig.13 This is a schematic diagram of the local structure of the stirring paddle of the present invention;

[0046] Fig.14 This is a schematic diagram of the cross-sectional structure of the stirring paddle of the present invention;

[0047] Fig.15 It is a schematic diagram of the three-dimensional structure of the squeezing roller of the present invention;

[0048] Fig.16 This is a schematic diagram of the front view structure of the squeezing roller of the present invention;

[0049] Fig.17 It is a schematic diagram of the cross-sectional structure of the squeezing roller of the present invention;

[0050] Fig.18 It is a schematic diagram of the structure of the scraper mechanism of the present invention from top view;

[0051] Fig.19 It is a schematic cross-sectional structure diagram of the scraping mechanism of the present invention;

[0052] Fig. 20 for Fig.19 The enlarged schematic diagram of point B in the middle;

[0053] Fig.21It is a schematic diagram of the three-dimensional structure of the liquid inlet head of the present invention.

[0054] In the figure: 1, coated kettle, 10, cavity, 101, discharge port, 1011, mounting frame, 11, stirring paddle, 110, hollow shaft motor, 1100, rotating shaft, 1101, stirring blade, 1102, downturned blade, 1103, inverted blade, 1104, upturned blade, 1110, flow channel, 111, kettle cover, 1111, opening groove, 112, kettle body, 113, threaded part, 114, lifting ring, 115, first feed port, 116, second feed port, 117, magnetic induction heating coil, 118, heat insulation protective cover, 119, thermometer, 2, circulation mechanism, 20, three-way valve, 21, screw pump, 22, connecting pipe, 221, sealing rotation Joint, 23, buffer tank, 3, extrusion dispersion mechanism, 31, extrusion bin, 311, discharge port, 312, block, 313, guide strip, 314, return spring, 32, pressurizing piston, 321, spring member, 322, roller, 323, guide ring, 324, guide groove, 4, dispersion barrier net, 41, rigid skeleton, 42, ceramic filter membrane, 5, scraper mechanism, 51, scraper, 52, extrusion roller, 53, liquid inlet head, 521, melt channel, 522, liquid outlet, 523, extrusion groove, 524, isolation cover, 531, first bevel gear, 532, second bevel gear, 533, transfer shaft, 534, gear, 535, gear ring, 536, protective shell. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] Embodiment 1:

[0059] like Figures 1 to 10 As shown, an ultra-high performance negative electrode material coating system includes a coating kettle 1, which is provided with a cavity 10 and a stirring paddle 11 for coating negative electrode materials. The coating kettle 1 is composed of an upper kettle cover 111 and a lower kettle body 112. The kettle cover 111 and the kettle body 112 are buckled and sealed by rotating and swinging a threaded member 113 and a rotatably set nut 1131. The bottom of the threaded member 113 is rotatably installed on the kettle body 112. An open groove 1111 is provided at a position of the kettle cover 111 facing the threaded member 113. After the threaded member 113 is rotated and swung into the open groove 1111, the kettle cover 111 and the kettle body 112 can be buckled and sealed by rotating the nut 1131 located on the upper part of the kettle cover 111. In addition, a lifting ring 114 is provided on the top of any two sets of symmetrically arranged threaded members 113, and the lifting ring 114 can be used to lift the coating kettle 1.

[0060] The kettle cover 111 and the kettle body 112 are combined to form a cavity 10. The kettle cover 111 is provided with a first feed port 115 and a second feed port 116 for inputting negative electrode materials and coating materials respectively. A hollow shaft motor 110 for driving the stirring paddle 11 to rotate is arranged on the top of the kettle cover 111. A magnetic induction heating coil 117 is wound around the outside of the kettle body 112 for heating the cavity 10 so that the coating material melts to form a fluid. A heat insulation protective cover 118 is arranged outside the magnetic induction heating coil 117, and a thermometer 119 for measuring and controlling the temperature of the cavity 10 is arranged on the kettle body 112. The magnetic induction heating method of the magnetic induction heating coil 117 has a faster heating speed, a more sensitive response, and a more accurate temperature control effect than traditional electric heating.

[0061] In addition, an ultra-high performance negative electrode material coating system also includes:

[0062] Circulation mechanism 2, extrusion dispersion mechanism 3 and dispersion barrier net 4;

[0063] The circulating flow mechanism 2 is connected to the discharge port 101 at the bottom of the cavity 10 and the top opening of the hollow flow channel 1110 on the stirring paddle 11. The circulating flow mechanism 2 circulates the negative electrode material in the cavity 10 to the flow channel 1110. The circulating flow mechanism 2 is a screw pumping mechanism. The circulating flow mechanism 2 is connected to the discharge port 101 through a three-way valve 20. The three-way valve 20 controls the switching of the output and circulation of the negative electrode material in the coating reactor 1. The structure 2 is composed of a horizontally arranged screw pump 21, a connecting pipe 22 and a buffer tank 23. The negative electrode material and the molten coating material outputted from the discharge port 101 are transported by the screw pump 21, lifted by the connecting pipe 22 and transported to the flow channel 1110. A sealed rotating joint 221 is provided at the connection portion between the connecting pipe 22 and the stirring paddle 11, and the buffer tank 23 is used to relieve the transport pressure of the connecting pipe 22, so that the negative electrode material and the molten coating material that cannot be transported in time can be temporarily stored in the buffer tank 23;

[0064] It should be emphasized here that it is difficult to transport the completely fluid molten coating material through a screw pump, but after the molten coating material is mixed with the powdered hard carbon negative electrode material, the mixture can be transported very smoothly through a screw pump. Moreover, the agglomerated negative electrode material will be initially crushed by the stirring paddle inside the reactor before entering the screw pump, so that the large volume of agglomerated negative electrode material is converted into a small volume of agglomerated negative electrode material, which is convenient for subsequent extrusion and dispersion.

[0065] The extrusion and dispersion mechanism 3 is installed on the upper part of the stirring paddle 11, and the extrusion and dispersion mechanism 3 is located in the cavity 10. The extrusion chamber 31 of the extrusion and dispersion mechanism 3 is connected with the flow channel 1110, and the extrusion chamber 31 is fixedly connected with the kettle cover 111 through a connecting piece. The extrusion chamber 31 is located at the lower end of the flow channel 1110, and the flow channel 1110 is provided with an opening connected with the extrusion chamber 31. A pressurizing piston 32 is arranged in the extrusion chamber 31, and the pressurizing piston 32 is sleeved on the rotating shaft of the stirring paddle 11, and the pressurizing piston 32 is located above the opening of the flow channel 1110. The upper end surface of the pressurizing piston 32 is provided with a raised guide ring 323, and the annular raised height of the guide ring 323 has a drop, and the guide ring 323 is connected to the rotating shaft of the stirring paddle 11. A roller 322 is installed, and the roller 322 is in contact with the annular raised edge of the guide ring 323. When the stirring paddle 11 rotates, the rotation of the roller 322 can make the pressurizing piston 32 float up and down, change the size of the space below the pressurizing piston 32, and then change the pressure, so that the negative electrode material is ejected from the discharge port 311. Therefore, when the pressurizing piston 32 moves downward, it is driven by the rotation of the stirring paddle 11, and when the pressurizing piston 32 moves upward and resets, it is driven by the spring member 321 installed on the upper end surface of the pressurizing piston 32. At the same time, the opening of the flow channel 1110 will continuously inject new negative electrode material to form an upward force on the pressurizing piston 32, so that the pressurizing piston 32 floats.

[0066] In addition, a slidable stopper 312 is provided at the discharge port 311. When the pressurizing piston 32 moves downward to increase the pressure in the extrusion chamber 31, the stopper 312 moves laterally to open the discharge port 311 and eject the negative electrode material. The lateral movement of the stopper 312 is driven by the up and down floating of the pressurizing piston 32. Specifically, a guide strip 313 is protruded on the inner wall of the upper part of the extrusion chamber 31, and a guide groove 324 corresponding to the guide strip 313 is provided at the circumferential edge of the pressurizing piston 32. The pressurizing piston 32 floats up and down through the guide groove 324 and the guide strip 313, and the inner wall at the lower part of the extrusion chamber 31 On the upper surface, a stopper 312 is provided which is arranged one-to-one with the guide strip 313. Initially, the stopper 312 has a certain misalignment angle with the guide strip 313, and at this time, the stopper 312 just seals the discharge port 311. When the pressurizing piston 32 is pressed down and gradually leaves the guide of the guide strip 313, the guide groove 324 on the pressurizing piston 32 will gradually dock with the upper end of the stopper 312. One side of the upper end of the stopper 312 is rounded, so that the guide groove 324 can be inserted into the stopper 312 along the rounded corner. In this process, the stopper 312 will move to overlap with the guide strip 313, thereby opening the discharge port 311 and realizing the injection of the negative electrode material.

[0067] In addition, a return spring 314 is provided at the lower end of the block 312. After the block 312 is disengaged from the guide groove 324, the return spring 314 is used to reset the block 312. A slide groove is provided between the block 312 and the bottom of the extrusion bin 31 for the block 312 to interact with, and no matter how the block 312 slides, the block 312 always completely covers the slide groove.

[0068] The dispersion barrier net 4 is arranged in the cavity 10, and the dispersion barrier net 4 is rigidly arranged, and the dispersion barrier net 4 spreads the negative electrode material ejected by the extrusion dispersion mechanism 3, and filters out the excess molten coating material on the surface of the negative electrode material. The shape of the dispersion barrier net 4 is arranged in a contour with the cavity 10, and the inner side of the dispersion barrier net 4 facing the extrusion dispersion mechanism 3 is a frameless structure, and the dispersion barrier net 4 includes an outer rigid frame 41 and an inner ceramic filter membrane 42, the rigid frame 41 is made of stainless steel, and the rigid frame 41 is set in the kettle body 112, and the rigid frame 41 and the inner wall of the kettle body 112 are interposed between the rigid frame 41 and the inner wall of the kettle body 112. A certain amount of space is reserved for storing the filtered molten coating material, and the negative electrode material is isolated on the inner side of the ceramic filter membrane 42. The rigid skeleton 41 provides rigid support for the ceramic filter membrane 42, and the ceramic filter membrane 42 is attached to the rigid skeleton 41. The mesh number of the ceramic filter membrane 42 is 100-300. The ceramic filter membrane 42 is purchased from Jiangsu Jiuwu High-Tech Co., Ltd. The impact site of the negative electrode material sprayed by the extrusion dispersion mechanism 3 and the ceramic filter membrane 42 is located at the top of the ceramic filter membrane 42. After the negative electrode material is dispersed at the top of the ceramic filter membrane 42, it gradually moves downward along the ceramic filter membrane 42 for re-coating.

[0069] Furthermore, it should be noted that the top of the mixture of the negative electrode material and the molten coating material in the cavity 10 is located within the range of the inclined setting of the ceramic filter membrane 42, while the vertically set part of the top of the ceramic filter membrane 42 is exposed outside the top of the mixture for the negative electrode material to be dispersed.

[0070] In addition, the ceramic filter membrane 42 can block the passage of negative electrode materials, while the molten coating material will not be blocked. Therefore, when the negative electrode material is not circulated, part of the molten coating material will be on the outside of the ceramic filter membrane 42. When the circulation is carried out to break up the agglomerated negative electrode materials, the dispersed negative electrode materials will directly fall on the ceramic filter membrane 42. The molten coating material separated from the outside of the ceramic filter membrane 42 just performs targeted coating treatment on these dispersed negative electrode materials, and the reaction treatment is rapid.

[0071] Embodiment 2:

[0072] The difference between Example 2 of the present invention and Example 1 described with reference to Example 1 is that:

[0073] like Figure 11-Figure 21 As shown, the end of the stirring paddle 11 near the dispersion barrier net 4 is provided with a scraper mechanism 5 for scraping and concentrating the dispersed negative electrode materials on the dispersion barrier net 4. The scraper mechanism 5 includes a plurality of scrapers 51 and squeeze rollers 52 equidistantly arranged in an annular direction around the stirring paddle 11. The scrapers 51 and the squeeze rollers 52 rotate synchronously with the stirring paddle 11. The squeeze roller 52 rotates while revolving. The scraper 51 is used to scrape the negative electrode materials dispersed on the ceramic filter membrane 42 and guide them to the squeeze roller 52 to avoid clogging the ceramic filter membrane 42 by the dispersed negative electrode materials. At the same time, the dispersed negative electrode materials are mixed with the original negative electrode materials through the squeezing of the squeeze roller 52 and coated again.

[0074] The squeezing roller 52 is tilted and rotatably mounted on the mounting frame 1011 of the stirring paddle 11. The tilting direction of the squeezing roller 52 is consistent with the tilting direction and angle of the ceramic filter membrane 42. The squeezing roller 52 rotates along with the stirring paddle 11 while relying on the gear transmission assembly to achieve its own self-rotation. The gear transmission assembly includes a first bevel gear 531, a second bevel gear 532, a rotating shaft 533, a gear 534 and a gear ring 535. The first bevel gear 531 is arranged on the top of the squeezing roller 52. The rotating shaft 533 is vertically rotatably mounted on the mounting frame 1011. The rotating shaft 533 is sleeved with a second bevel gear 531 meshing with the first bevel gear 531. The first bevel gear 531, the second bevel gear 532, the rotating shaft 533, the gear 534 and the gear ring 535 are installed on the top of the ceramic filter membrane 42, and the gear ring 535 is fixed to the rigid frame 41 by threaded fasteners, and the gear ring 535 presses the top of the ceramic filter membrane 42 to fix the ceramic filter membrane 42 on the rigid frame 41. The gear 534 is meshed with the gear ring 535, and the outside of the first bevel gear 531, the second bevel gear 532, the rotating shaft 533, the gear 534 and the gear ring 535 are isolated and protected by a protective shell 536 to avoid contact with the negative electrode material and the molten coating material, and the protective shell 536 rotates synchronously with the stirring paddle 11.

[0075] When the stirring paddle 11 rotates, the gear 534 will first cooperate with the ring gear 535, so that the gear 534 rotates on its own. Through the transmission of the rotating shaft 533, the first bevel gear 531 cooperates with the second bevel gear 532, so that the extrusion roller 52 rotates on its own. The extrusion roller 52 continuously rotates and extrude, so that the dispersed negative electrode material is re-coated.

[0076] Furthermore, the scraper 51 is arranged to be inclined toward the squeezing roller 52 , and the negative electrode material scraped off by the scraper 51 is directly guided to the squeezing roller 52 , where the negative electrode material is concentrated and extruded and decomposed, thereby completely eliminating the agglomeration phenomenon.

[0077] In addition, a melt channel 521 is provided inside the extrusion roller 52, and a liquid outlet 522 connected to the melt channel 521 is provided on the side wall of the extrusion roller 52; a liquid inlet head 53 connected to the melt channel 521 is provided at the bottom of the extrusion roller 52, and the liquid inlet head 53 extends from the bottom of the extrusion roller 52 over the dispersion barrier net 4 and is placed on the outside of the dispersion barrier net 4. The liquid inlet head 53 guides the molten coating material filtered out of the dispersion barrier net 4 into the melt channel 521, and the molten coating material is discharged from the liquid outlet 522. Specifically, the molten coating material filtered out of the dispersion barrier net 4 on the outside of the dispersion barrier net 4 is discharged from the liquid outlet 522. Specifically, when the extrusion roller 52 rotates and extrude the negative electrode material, accompanied by the continuous stirring of the stirring paddle 11 The molten coating material will fluctuate due to the rotation and stirring, and then the molten coating material will be discharged from the liquid outlet 522, participating in the rotation and extrusion work of the extrusion roller 52, and efficiently participating in the coating work of the negative electrode material. In addition, the extrusion roller 52 is provided with extrusion grooves 523 spaced apart in the ring direction, and the extrusion grooves 523 are spaced apart from the liquid outlet 522. What's more, an isolation cover 524 is provided on the outer cover of the extrusion roller 52, so that only the part of the extrusion roller 52 that contacts the dispersion barrier net 4 is exposed to the isolation cover 524, and the rest of the parts are protected by the isolation cover 524 to prevent the negative electrode material from flowing back. At the same time, the isolation cover 524 protects the negative electrode material extruded by the extrusion roller 52 so that it can be efficiently coated with the molten coating material discharged from the liquid outlet 522.

[0078] In addition, a partition plate 530 is provided at the liquid inlet head 53 to separate the bottom of the dispersion barrier net 4 from the side wall of the coating reactor 1. The partition plate 530 is used to separate the negative electrode material inside the dispersion barrier net 4 to prevent the negative electrode material from escaping to the outside of the dispersion barrier net 4 through the dispersion barrier net 4 and driving the bottom.

[0079] Embodiment 3:

[0080] The difference between Embodiment 3 of the present invention and Embodiment 1 and Embodiment 2 described with reference to Embodiment 1 and Embodiment 2 is as follows:

[0081] like Fig.11 , 19 As shown in Figure 21, in addition to the central rotating shaft 1100 and the external mounting frame 1011, the stirring paddle 11 is also provided with a spiral stirring blade 1101 on the rotating shaft 1100. The stirring blade 1101 is located at the center of the stirring paddle 11, and a downward-turned blade 1102 is provided on the top of the mounting frame 1011, an inward-turned blade 1103 is provided on the isolation cover 524, and an upward-turned blade 1104 is provided at the bottom of the stirring paddle 11. Through the mutual cooperation of the stirring blade 1101, the downward-turned blade 1102, the inward-turned blade 1103 and the upward-turned blade 1104, a three-dimensional stirring system is formed, so that the negative electrode material and the molten coating material are better mixed and coated.

[0082] Working process:

[0083] First, the negative electrode material and the coating material are added into the cavity of the coating kettle through the first feed port and the second feed port, and then the negative electrode material and the molten coating material are stirred by the stirring paddle and the coating material is heated by the magnetic induction heating coil 117 to melt the coating material to form a fluid, so that the molten coating material is coated on the outside of the negative electrode material. After continuous stirring for a certain period of time, the circulation mechanism is opened through the three-way valve to allow the negative electrode material and the molten coating material to flow, and the negative electrode material and the molten coating material are sprayed onto the dispersion barrier net through the extrusion dispersion mechanism, and the negative electrode material is impacted and distributed by the dispersion barrier net, so that the negative electrode material agglomerated in the previous stirring process can be dispersed, and at the same time, the excess molten coating material on the surface of the negative electrode material can be separated by the dispersion barrier net, and the separated molten coating material is concentrated and diverted to the previously dispersed negative electrode material for coating processing, so that the coating quality of the negative electrode material is effectively improved.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-high performance negative electrode material coating system, comprising a coating kettle (1), wherein a cavity (10) and a stirring paddle (11) for coating the negative electrode material are arranged in the coating kettle (1), characterized in that: Also includes: A circulation mechanism (2), an extrusion and dispersion mechanism (3) and a dispersion barrier net (4); The circulation mechanism (2) is connected to a discharge port (101) at the bottom of the cavity (10) and a top opening of a hollow flow channel (1110) on the stirring paddle (11), and the circulation mechanism (2) circulates the negative electrode material in the cavity (10) into the flow channel (1110); The extrusion and dispersion mechanism (3) is mounted on the upper part of the stirring paddle (11), the extrusion and dispersion mechanism (3) is located in the cavity (10), the extrusion chamber (31) of the extrusion and dispersion mechanism (3) is in communication with the flow channel (1110), and when the stirring paddle (11) rotates, the pressure in the extrusion chamber (31) fluctuates, squeezing the negative electrode material flowing out of the flow channel (1110), so that the negative electrode material is ejected from the extrusion chamber (31); A plurality of intermittently opened discharge ports (311) are provided on the side wall of the extrusion bin (31), and the negative electrode material is sprayed from the opened discharge ports (311) onto the dispersion barrier net (4); A pressurizing piston (32) is arranged in the extrusion bin (31), and when the stirring paddle (11) rotates, the pressurizing piston (32) floats up and down along the side wall of the extrusion bin (31), thereby changing the size of the space in the extrusion bin (31), thereby changing the pressure in the extrusion bin (31), and causing the negative electrode material to be ejected from the discharge port (311); A slidably arranged stopper (312) is provided at the discharge port (311); when the pressurizing piston (32) moves downward to increase the pressure in the extrusion chamber (31), the stopper (312) moves laterally to open the discharge port (311) and spray out the negative electrode material; The dispersion barrier net (4) is arranged in the cavity (10), the dispersion barrier net (4) is rigidly arranged, and the dispersion barrier net (4) spreads the negative electrode material ejected by the extrusion dispersion mechanism (3) and filters out excess molten coating material on the surface of the negative electrode material.

2. The ultra-high performance negative electrode material coating system according to claim 1, characterized in that: The circulation mechanism (2) is a screw pumping mechanism. The circulation mechanism (2) is connected to the discharge port (101) via a three-way valve (20). The three-way valve (20) controls the switching of the output and circulation of the negative electrode material in the coating kettle (1).

3. The ultra-high performance negative electrode material coating system according to claim 1, characterized in that: When the pressurizing piston (32) moves downward, it is driven by the rotation of the stirring paddle (11), and when the pressurizing piston (32) moves upward to reset, it is driven by a spring member (321) installed on the upper end surface of the pressurizing piston (32).

4. The ultra-high performance negative electrode material coating system according to claim 1, characterized in that: The lateral movement of the stopper (312) is driven by the up and down floating of the pressurizing piston (32).

5. The ultra-high performance negative electrode material coating system according to claim 1, characterized in that: The dispersion barrier net (4) is shaped like the cavity (10), and the inner side of the dispersion barrier net (4) facing the extrusion dispersion mechanism (3) is a frameless structure. The dispersion barrier net (4) includes an outer rigid frame (41) and an inner ceramic filter membrane (42) that is fitted thereon.

6. The ultra-high performance negative electrode material coating system according to claim 5, characterized in that: A scraping mechanism (5) is provided at the end of the stirring paddle (11) close to the dispersion barrier net (4) for scraping and concentrating the dispersed negative electrode material on the dispersion barrier net (4). The scraping mechanism (5) comprises a plurality of scrapers (51) and squeezing rollers (52) arranged equidistantly in an annular direction around the stirring paddle (11). The scrapers (51) and the squeezing rollers (52) both rotate synchronously with the stirring paddle (11), and the squeezing rollers (52) rotate while revolving.

7. The ultra-high performance negative electrode material coating system according to claim 6, characterized in that: A melt channel (521) is provided inside the extrusion roller (52), and a liquid outlet hole (522) communicating with the melt channel (521) is provided on a side wall of the extrusion roller (52); A liquid inlet head (53) connected to the melt channel (521) is provided at the bottom of the extrusion roller (52). The liquid inlet head (53) extends from the bottom of the extrusion roller (52) over the dispersion barrier net (4) and is placed on the outside of the dispersion barrier net (4). The liquid inlet head (53) guides the molten coating material filtered out by the dispersion barrier net (4) into the melt channel (521), and the molten coating material is discharged from the liquid outlet (522).

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