Fibrillation device

Abstract

The invention relates to the technical field of granular material treatment equipment, in particular to a fibrillation device. The fibrillating device comprises a shell, a rolling planetary mechanism is arranged in the shell and comprises a center roller, a planet carrier and at least two planet rollers, the planet rollers rotate and revolve around the center roller under the action of power, and a working cavity is formed between the center roller and the shell. The fibrillating device is provided with a feeding channel allowing materials to enter the working cavity and a discharging channel allowing the materials to go out of the working cavity, and the planetary roller is located in the working cavity to be matched with the center roller to roll the materials so that the materials can be fibrillated. By means of rotation and revolution of the planetary rollers and matching with the center roller to generate radial force and tangential force on materials between the center roller and the planetary rollers, shearing force is generated in the materials to achieve fibrillation, in the one-time feeding and discharging process, all the planetary rollers can be used for conducting more sufficient fibrillation, and the working efficiency of fibrillation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of particle material processing equipment, and in particular to a fibrillation device. Background Art

[0002] With the explosive growth of the energy storage industry, dry electrode technology has become a key technology for the research of all-solid-state batteries. Compared with traditional wet electrode technology, dry electrode technology has the advantages of lower cost, more environmental protection, more adaptability to large-scale production, higher energy density and better electrical performance. The dry process is to dry-mix the active particles and the conductive agent evenly and then add the PTFE binder. After the PTFE binder is fibrillated, it is extruded to form a self-supporting film, and finally rolled and covered on the surface of the current collector. Fibrillation mixing is the front stage of pole piece rolling. By high-shear mixing of the mixture containing the binder, the binder is fibrillated to combine the active material and the conductive material together. After the PTFE binder and the active material are combined through the fibrillation device, they are sent to the film making machine to form a self-supporting film under the rolling of the calendering roller of the film making machine.

[0003] At present, some fibrillation devices use an open mill, which uses two parallel rollers of the open mill to squeeze the electrode material particles for fibrillation. The material between the two rollers is squeezed to form a shearing effect on the inside of the material, and the particles inside the material are displaced from each other to form a shearing effect, so that the adhesive particles are fibrillated. The set fibrillation mixing effect is achieved by repeatedly squeezing the material between the two rollers. The roller speed affects the efficiency of the fibrillation mixing of the material. Usually, the roller speed cannot be too fast. If the speed is too fast, the shear rate is too high, which will destroy the surface modification effect of the electrode material particles. Surface modification is the attachment of conductive particles to the surface of electrochemically active particles. The electrochemically active particles are conductive. In order to enhance the conductivity, conductive particles are attached to the surface of the electrochemically active particles to enhance their conductive properties. Some battery active materials are mechanochemically modified and intervene in the battery manufacturing process. The material tries to avoid the damage of high shear to its surface modification effect. Therefore, in order to avoid destroying the surface modification effect of the electrode material particles, when using an open mill, the roller speed is limited, which affects the work efficiency. Summary of the invention

[0004] The object of the present invention is to provide a fibrillation device to solve the problem of low working efficiency of the current method of using a pair of rollers of an open mill to extrude materials for fibrillation.

[0005] The technical solution of the fibrillation device of the present invention is: A fibrillation device includes a housing. Inside the housing, there is a roller pressing planetary mechanism. The roller pressing planetary mechanism includes a central roller, a planetary carrier, and at least two planetary rollers mounted on the planetary carrier and located around the central roller. A sun gear is provided on the central roller, an internal gear ring is provided on the inner wall of the housing, and planet gears meshing with the sun gear and the internal gear ring are provided on the planetary rollers so that the planetary rollers can rotate self - and revolve around the central roller under the action of power. A working chamber is formed between the central roller and the housing. The fibrillation device has a feed channel for feeding materials into the working chamber and a discharge channel for discharging materials from the working chamber. The planetary rollers are in the working chamber to cooperate with the central roller to roll - press the materials to fibrillate them.

[0006] Beneficial effects: The present invention pioneeringly provides a fibrillation device that uses planetary rollers to improve the fibrillation efficiency. The planetary rollers cooperate with the central roller to fibrillate the materials. Through the cooperation of the sun gear on the central roller, the internal gear ring on the inner wall of the housing, the planet gears on the planetary rollers, and the planetary carrier, a roller pressing planetary mechanism that can roll - press the materials is formed. After power is input to the roller pressing planetary mechanism, each planetary roller can rotate self - and revolve around the central roller under the action of power. After the materials enter the working chamber between the central roller and the housing through the feed channel, the planetary rollers cooperate with the central roller to fibrillate the materials and then discharge them from the discharge channel. When fibrillating the materials, the rotation and revolution of the planetary rollers are used to cooperate with the central roller to generate radial and tangential forces on the materials between the central roller and the planetary rollers, so that shear forces are generated inside the materials to achieve fibrillation. There are not only the shear effects of radial forces but also the shear effects of tangential forces. Each planetary roller can roll - press the materials. During one feeding and discharging process, more sufficient fibrillation can be carried out using each planetary roller, which is beneficial to the working efficiency of fibrillation.

[0007] Further, both the central roller and the planetary rollers are conical roller structures. The conical roller structure includes a conical section. The two ends of the conical section are respectively a large - diameter end and a small - diameter end. The large - diameter end of the conical section of the central roller corresponds to the small - diameter end of the conical section of the planetary roller, and the small - diameter end of the conical section of the central roller corresponds to the large - diameter end of the conical section of the planetary roller. A region for rolling - pressing the materials is formed between the conical section of the central roller and the conical section of the planetary roller.

[0008] Further, the region of the working chamber corresponding to the small - diameter end of the conical section of the planetary roller communicates with the feed channel, and the region of the working chamber corresponding to the large - diameter end of the conical section of the planetary roller communicates with the discharge channel.

[0009] Further, the inner wall of the housing has a conical roller - pressing wall surface adapted to the conical section of the planetary roller, and this roller - pressing wall surface is used to cooperate with the conical section of the planetary roller to roll - press the materials.

[0010] Further, the planetary rollers are provided with the planetary gears at both ends, and the planetary gears at both ends are the same. Inner gear rings and sun gears adapted to the planetary gears at both ends of the planetary rollers are respectively provided on the outer shell and the central roller. Gear mounting parts with the same diameter are respectively provided on both axial sides of the conical section of the central roller for mounting the sun gears.

[0011] Further, there are two planet carriers of the roll pressing planetary mechanism. Both ends of the planetary roller are respectively mounted on the two planet carriers. The planet carrier is of an annular structure and is rotatably sleeved on the central roller. Limiting structures for axially limiting the planet carrier are respectively provided on both opposite sides of the two planet carriers on the central roller.

[0012] Further, the central roller is horizontally arranged. The central roller has a central inner cavity. A partition is provided in the central inner cavity, and a feed cavity and a discharge cavity are respectively formed on both sides of the partition. Feed holes penetrating the cavity wall of the feed cavity and the outer peripheral surface of the central roller and discharge holes penetrating the cavity wall of the discharge cavity and the outer peripheral surface of the central roller are provided on the central roller. The feed channel includes the feed cavity and the feed holes. The discharge channel includes the discharge cavity and the discharge holes.

[0013] Further, one end of the central roller corresponding to the feed cavity is connected with an inlet pipeline. A conveying mechanism for pushing the material into the working cavity is provided in the inlet pipeline. The feed channel includes the inner cavity of the inlet pipeline.

[0014] Further, one end of the inlet pipeline away from the central roller is connected with a feed hopper. The feed hopper has an upwardly open vertical opening for the material to enter.

[0015] Further, the inner wall of the outer shell has a roll pressing wall surface adapted to the outer peripheral surface of the planetary roller. The roll pressing wall surface is used to cooperate with the outer peripheral surface of the planetary roller to roll press the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the fibrillation device of the present invention; Figure 2 is Figure 1 a cross-sectional schematic diagram of the fibrillation device in Figure 3 is Figure 1 a schematic diagram of the roll pressing planetary mechanism in

[0017] In the figure: 1. Feed hopper; 21. Outer shell; 22. Central roller; 23. Planetary roller; 201. Feed end baffle; 202. Feed chamber; 203. Central roller mounting bearing; 204. Planetary roller mounting bearing; 205. Outer shell body; 206. O-ring seal; 207. Internal gear ring; 208. Planetary roller body; 209. Planet gear; 210. Sun gear; 211. Discharge end mounting ring; 212. Planet carrier mounting bearing; 213. Discharge end outer cover; 214. Discharge end planet carrier; 215. Discharge end seal ring; 216. Feed end planet carrier; 217. Feed end outer cover; 218. Feed end mounting ring; 219. Y-ring seal; 220. Feed end connecting ring; 221. Feed end seal ring; 222. Discharge end connecting ring; 223. Discharge chamber; 224. Feed pipe; 225. Feed hole; 226. Discharge hole; 227. Central roller body; 3. Receiving box; 4. Support frame. Detailed implementation manners

[0018] The basic concept of the fibrillation device of the present invention is to use each planetary roller to cooperate with the central roller to extrude and mix the material, so as to improve the working efficiency of fibrillation.

[0019] The following is a specific description of the present invention in combination with embodiments.

[0020] Embodiment of the fibrillation device of the present invention: As Figure 1 , Figure 2 , Figure 3 shown, the fibrillation device includes an outer shell 21, and a roller pressing planetary mechanism is arranged inside the outer shell 21. The roller pressing planetary mechanism includes a central roller 22, planetary rollers 23, a planet carrier, and an internal gear ring 207. There are at least two planetary rollers 23, and each planetary roller 23 is arranged around the central roller 22. The planetary rollers 23 are mounted on the planet carrier. A sun gear 210 is arranged on the central roller 22, and an internal gear ring 207 is arranged on the inner wall of the outer shell 21. Planet gears 209 are arranged on the planetary rollers 23, and the planet gears 209 mesh with the corresponding sun gears 210 and internal gear rings 207, so that the planetary rollers 23 can revolve around the central roller 22 while rotating. The central roller 22 is rotatably mounted on the outer shell 21, and a working chamber is formed between the central roller 22 and the outer shell 21. The fibrillation device has a feed channel for the material to enter the working chamber and a discharge channel for the material to exit from the working chamber. The planetary rollers 23 are located in the working chamber to cooperate with the central roller 22 to roll-press the material to fibrillate the material.

[0021] Utilizing the planetary rollers 23 in cooperation with the center roller 22 to fibrillate the material can improve work efficiency. After power is input to the roller-pressing planetary mechanism, the planetary rollers 23 can rotate and revolve around the center roller 22 under the action of the power. After the material passes through the feed channel and enters the working chamber between the center roller 22 and the outer shell 21, the planetary rollers 23 cooperate with the center roller 22 to fibrillate the material and then discharge it from the discharge channel. When fibrillating the material, the rotation and revolution of the planetary rollers 23 and the center roller 22 are utilized to generate radial force and tangential force on the material between the center roller 22 and the planetary rollers 23, so that shear force is generated inside the material to achieve fibrillation. Not only the shear effect of radial force, but also the shear effect of tangential force is achieved. Each planetary roller 23 can roll the material. In the process of feeding and discharging once, the material can be squeezed multiple times. Utilizing each planetary roller 23 can more fully fibrillate, does not require the pressure roller to have a high rotation speed and is beneficial to the work efficiency of fibrillation.

[0022] In this embodiment, four planetary rollers 23 are provided, which are evenly distributed around the center roller 22. The working chamber where the planetary rollers 23 are located is closed except for being connected to the feed channel and the discharge channel. There is a set gap between the planetary rollers 23 and the center roller 22. When the material passes through the gap, it is squeezed and fibrillated. After the material enters the working chamber, under the action of the revolution of the planetary rollers 23, the material is repeatedly squeezed by each planetary roller 23. The center roller 22 and the planetary rollers 23 both rotate, generating tangential force on the material between them, thereby improving the fibrillation efficiency. Moreover, each planetary roller 23 stirs the material in the working chamber, which is conducive to sufficient mixing.

[0023] A feed hopper 1 is provided at the inlet of the feed channel, and a receiving box 3 is provided below the outlet of the discharge channel. A support frame 4 is fixed at the bottom of the outer shell 21, and the support frame 4 can be supported on the ground and ensure that the outer shell 21 is fixed. The center roller 22 is connected to a driving device in a transmission manner, and the driving device can be a motor. The center roller 22 has a transmission connection end protruding from the outer shell 21. The motor can be connected to the transmission connection end of the center roller 22 through a belt to drive the center roller 22 to rotate. The rotation axis of the center roller 22 is its central axis. When the center roller 22 rotates, the sun gear 210 fixed thereon is meshed with the planetary gear 209 fixed on the planetary roller 23 and the inner gear ring 207 fixed on the inner wall of the outer shell 21 for transmission. The planetary gear 209 and the sun gear 210 are gears, and the planetary gear 209 is meshed with the corresponding inner gear ring 207 and the sun gear 210, so that the planetary roller 23 revolves around the center roller 22 while rotating.

[0024] In this embodiment, the fibrillation device is used for the dry electrode process. Correspondingly, the material is the mixed electrode material particles. After the material enters the fibrillation device for treatment, the PTFE binder in the material fibrillates, and the material becomes lumps and drops into the material receiving box 3. If the ideal state is not achieved in one treatment, the material in the material receiving box 3 can be poured into the feed hopper 1 again for re-fibrillation treatment.

[0025] Both the central roller 22 and the planetary roller 23 are tapered roller structures. The tapered roller structure includes a tapered section. The two ends of the tapered section are respectively a large-diameter end and a small-diameter end. The outer diameter of the large-diameter end is greater than the outer diameter of the small-diameter end. The large-diameter end of the tapered section of the central roller 22 corresponds to the small-diameter end of the tapered section of the planetary roller 23, and the small-diameter end of the tapered section of the central roller 22 corresponds to the large-diameter end of the tapered section of the planetary roller 23. A region for rolling the material is formed between the tapered section of the central roller 22 and the tapered section of the planetary roller 23. The gaps at various positions between the tapered section of the central roller 22 and the tapered section of the planetary roller 23 are uniform, and the axes of the central roller 22 and the planetary roller 23 are parallel. The taper of the tapered section of the central roller 22 and the tapered section of the planetary roller 23 is the same. When using the tapered roller structure to fibrillate the material, the linear velocities at various positions on the tapered section are different, resulting in an obvious linear velocity difference at various positions between the tapered section of the central roller 22 and the tapered section of the planetary roller 23, which is beneficial to improving the shearing effect on the material. In other embodiments, the central roller and the planetary roller can also be cylindrical roller structures, and the surfaces of the central roller and the planetary roller for rolling the material are cylindrical surfaces.

[0026] The area corresponding to the small-diameter end of the tapered section of the planetary roller 23 in the working chamber is communicated with the feed channel, and the area corresponding to the large-diameter end of the tapered section of the planetary roller 23 in the working chamber is communicated with the discharge channel. That is, the material first enters the area corresponding to the small-diameter end of the tapered section of the planetary roller 23, undergoes a rolling effect and moves to the area corresponding to the large-diameter end of the tapered section of the planetary roller 23. Since the working chamber is adapted to the planetary roller 23, the space in the area corresponding to the large-diameter end of the tapered section of the planetary roller 23 in the working chamber is larger, facilitating the movement of the material to the discharge channel. In other embodiments, the feed channel can also be communicated with the area corresponding to the large-diameter end of the tapered section of the planetary roller, and the discharge channel can be communicated with the area corresponding to the small-diameter end of the tapered section of the planetary roller. At this time, a conveying pressure can be applied to the material in the feed channel to gradually move it towards the discharge channel.

[0027] The inner wall of the outer shell 21 has a conical roller pressing wall surface adapted to the conical section of the planetary roller 23. This roller pressing wall surface is used to cooperate with the conical section of the planetary roller 23 to roll the material. The roller pressing wall surface is a conical surface, and the gaps at various positions between the roller pressing wall surface and the outer peripheral surface of the conical section of the planetary roller 23 are consistent, and the gap at this position is equal to the gap between the central roller 22 and the conical section of the planetary roller 23. By using the inner wall of the outer shell 21 to cooperate with the planetary roller 23, the material can also be rolled, improving the working efficiency. In other embodiments, the gap between the inner wall of the outer shell and the planetary roller can also be larger, and the material is not rolled relying on the inner wall of the outer shell. In other embodiments, when the central roller and the planetary roller are of cylindrical roller structure, the inner diameters at the parts corresponding to the planetary rollers in the radial direction of the outer shell are the same everywhere.

[0028] Planet wheels 209 are provided at both ends of the planetary roller 23. Correspondingly, internal gear rings 207 and sun gears 210 adapted to the planet wheels 209 at both ends of the planetary roller 23 are provided on the outer shell 21 and the central roller 22 respectively. Sun gears 210 are provided at both axial ends of the central roller 22, planet wheels 209 are provided at both axial ends of the planetary roller 23, and internal gear rings 207 are provided at both axial ends of the inner wall of the outer shell 21. The sun gear 210, the planet wheel 209, and the internal gear ring 207 at the same axial end form a cooperation. The specifications of each planetary roller 23 are the same, the planet wheels 209 at both ends are the same, the sun gears 210 at both ends are the same, and the internal gear rings 207 at both ends are the same. The inner diameters of the parts where the two internal gear rings 207 on the inner wall of the outer shell 21 are located are the same. Gear mounting parts with the same diameter are provided on both axial sides of the conical section of the central roller 22 for mounting the sun gears 210. The two sun gears 210 are respectively mounted on the two side gear mounting parts. Using the two side gear mounting parts with the same diameter can avoid the influence of the conical section on the gear setting. In other embodiments, the sun gear, the internal gear ring, and the planet wheel can also be provided only at one end of the central roller, the outer shell, and the planetary roller, and the other end rotates with it.

[0029] There are two planet carriers of the roller pressing planetary mechanism. The two ends of the planetary roller 23 are respectively mounted on the two planet carriers. The two planet carriers have the same size. The planet carrier is a ring structure and is rotatably sleeved on the central roller 22. A sealing ring is provided between the outer peripheral surface of the planet carrier and the inner wall of the outer shell 21. Limiting structures for axially limiting the planet carrier are provided on the central roller 22 on the opposite sides of the two planet carriers respectively. The two side limiting structures respectively form a limiting cooperation with the two planet carriers to ensure the axial positions of the planetary roller 23 and the planet carrier.

[0030] The central roller 22 is horizontally arranged and has a central inner cavity. A partition is provided in the central inner cavity, and a feed cavity 202 and a discharge cavity 223 are respectively formed on both sides of the partition. The central roller 22 is provided with a feed hole 225 penetrating the cavity wall of the feed cavity 202 and the outer peripheral surface of the central roller 22, and a discharge hole 226 penetrating the cavity wall of the discharge cavity 223 and the outer peripheral surface of the central roller 22. The feed channel includes the feed cavity 202 and the feed hole 225, and the discharge channel includes the discharge cavity 223 and the discharge hole 226. The feed hole 225 and the discharge hole 226 have a set distance in the axial direction of the central roller 22, and this distance is determined according to the fibrillation effect. If the fibrillation is not sufficient, the distance between the feed hole 225 and the discharge hole 226 can be increased. At this time, the overall axial dimension of the fibrillation device can be appropriately increased, so that the material has a relatively long moving path in the axial direction in the working cavity and receives more roller pressing. By using the internal cavity of the central roller 22 to form the feed cavity 202 and the discharge cavity 223, the material can accumulate in the relatively large spaces in the feed cavity 202 and the discharge cavity 223, reducing blockage. In other embodiments, the central roller may not be provided with a feed cavity, but instead a feed port may be directly provided at the top of the outer shell as the feed channel, so that the material directly enters the working cavity from the feed port on the outer shell, and after fibrillation, exits from the discharge cavity of the central roller; the central roller may also not be provided with a discharge cavity, but instead a discharge port may be provided at the bottom of the outer shell as the discharge channel. In order to achieve sufficient fibrillation, the discharge port can be closed when the material is fibrillated and opened when it can be discharged.

[0031] One end of the central roller 22 corresponding to the feed cavity 202 is open and connected to a feed pipe 224. A conveying mechanism for pushing the material into the working cavity is provided in the feed pipe 224. The feed channel includes the inner cavity of the feed pipe 224. The conveying mechanism can be a screw conveying mechanism. After the material enters the feed pipe 224, the conveying mechanism can push the material forward, apply a conveying pressure to the material, so that the material can smoothly enter the working cavity and move towards the discharge cavity 223. In other embodiments, a pushing device can also be provided outside the feed pipe. The pushing device has a telescopic rod, the telescopic direction of the telescopic rod is the same as the extending direction of the feed pipe, a pushing plate is fixed at the end of the telescopic rod, and the feed pipe is provided with an opening for the pushing plate to fit and extend into. The pushing plate is driven by the pushing device to move to push the material in the feed channel.

[0032] One end of the feed pipe 224 away from the central roller 22 is connected to a feed hopper 1. The feed hopper 1 has an upwardly open opening for the material to enter. The feed channel includes the inner cavity of the hopper, which is convenient for feeding the material into the feed channel. In other embodiments, the feed hopper may not be provided, and an upward opening may be directly provided on the feed pipe as the feed port.

[0033] Taking the end where the material of the fibrillation device enters as the feeding end and the other end as the discharging end where the material exits. The central roller 22 includes a central roller main body 227 which is separately arranged and fixedly connected, as well as a feeding end mounting ring 218, a feeding end connecting ring 220, a discharging end mounting ring 211, and a discharging end connecting ring 222. The outer shell 21 includes an outer shell main body 205 which is separately arranged and fixedly connected, as well as a feeding end sealing ring 221, a feeding end outer cover 217, a discharging end sealing ring 215, and a discharging end outer cover 213. The two planet carriers of the roller pressing planetary mechanism are respectively a feeding end planet carrier 216 and a discharging end planet carrier 214.

[0034] The central roller main body 227 constitutes the tapered section of the central roller 22. The feeding hole 225 and the discharging hole 226 are arranged on the central roller main body 227. The feeding hole 225 and the discharging hole 226 are evenly distributed along the circumferential direction of the central roller main body 227, and their sizes and quantities are set according to requirements. The feeding end mounting ring 218 and the discharging end mounting ring 211 are located on both axial sides of the central roller main body 227 and are connected. Sun gears 210 are installed on the outer circumferential surfaces of the feeding end mounting ring 218 and the discharging end mounting ring 211. The outer diameters of the feeding end mounting ring 218 and the discharging end mounting ring 211 are the same. A step is provided at one end of the feeding end mounting ring 218 and the discharging end mounting ring 211 close to the central roller main body 227, and corresponding steps are provided on the planet carrier. Between the step of the feeding end mounting ring 218 and the step of the feeding end planet carrier 216, and between the step of the discharging end mounting ring 211 and the step of the discharging end planet carrier 214, planet carrier mounting bearings 212 are respectively provided, so that the feeding end planet carrier 216 and the discharging end planet carrier 214 are rotatably mounted on the central roller 22. Moreover, a limiting structure is formed by the steps on the feeding end mounting ring 218 and the discharging end mounting ring 211, and the planet carrier mounting bearings 212 are used to maintain the mounting position of the planet carrier.

[0035] The planetary roller 23 includes a planetary roller main body 208. The planetary roller main body 208 includes a solid cone and mounting shafts arranged at both ends of the cone. The cone constitutes the tapered section of the planetary roller 23. The two end mounting shafts are respectively rotatably mounted on the two side planet carriers through planetary roller mounting bearings 204. Mounting holes for each planetary roller 23 to be rotatably mounted are provided on both the feeding end planet carrier 216 and the discharging end planet carrier 214. The mounting shafts of the planetary roller main body 208 pass through the ends of the planet carrier to mount the planet gears 209.

[0036] The outer shell main body 205 is a conical cylinder structure. The inner wall of the outer shell main body 205 forms a conical roller pressing inner wall, and the axial length of the outer shell main body 205 is adapted to the axial length of the conical section of the planetary roller main body 208. The feed end sealing ring 221 and the discharge end sealing ring 215 are respectively located on the two axial sides of the outer shell main body 205 and are fixedly connected. The inner diameters of the feed end sealing ring 221 and the discharge end sealing ring 215 are the same, and internal gear rings 207 are respectively provided on the inner walls of the feed end sealing ring 221 and the discharge end sealing ring 215. Between the feed end planetary carrier 216 and the central roller main body 227, between the feed end planetary carrier 216 and the feed end sealing ring 221, between the discharge end planetary carrier 214 and the central roller main body 227, between the discharge end planetary carrier 214 and the discharge end sealing ring 215, and between the mounting shaft of the planetary roller main body 208 and the planetary carrier are respectively sealed by O-ring seals 206.

[0037] The feed end outer cover 217 and the discharge end outer cover 213 are annular structures and are located on the opposite sides of the two end sealing rings. The outer edge part of the feed end outer cover 217 is fixedly connected to the feed end sealing ring 221, and the outer edge part of the discharge end outer cover 213 is fixedly connected to the discharge end sealing ring 215. The feed end connection ring 220 and the discharge end connection ring 222 of the central roller 22 are located on the opposite sides of the two end mounting rings and are fixedly connected, and bolts can be used for connection. The feed end connection ring 220 and the discharge end connection ring 222 are respectively rotatably mounted on the inner edge parts of the feed end outer cover 217 and the discharge end outer cover 213 through central roller mounting bearings 203, so that the central roller 22 is rotatably mounted at the center of the outer shell 21.

[0038] The space surrounded by the feed end planetary carrier 216, the discharge end planetary carrier 214, the outer shell 21, and the central roller 22 forms a working chamber. The central roller main body 227, the feed end mounting ring 218, the feed end connection ring 220, the discharge end mounting ring 211, and the discharge end connection ring 222 are coaxially arranged, jointly forming a central cavity of the central roller 22. The partition plate for separating the feed chamber 202 and the discharge chamber 223 is arranged in the middle of the central roller main body 227. Both ends of the central roller 22 have openings. At the opening corresponding to the feed chamber 202, a feed end baffle 201 is provided. The feed end baffle 201 is rotatably mounted in the feed end connection ring 220. A Y-shaped sealing ring 219 is provided between the feed end connection ring 220 and the feed end baffle 201. The feed end baffle 201 is an annular structure, and a feed pipe 224 is fixedly connected to the central hole part thereof. When the central roller 22 rotates, the feed end baffle 201 does not rotate, and at the same time, the sealing performance of the feed chamber 202 is maintained.

[0039] After the material is placed into the feeding hopper 1, it can be pushed by the conveying mechanism in the feeding pipeline 224, pass through the feeding chamber 202 and the feeding hole 225 to reach the upstream of the working chamber. After being stirred and kneaded by the planetary rollers 23, the shear force formed between the roll gaps will extrude and mix the active material, the conductive agent and the binder. The material moves downstream, is then pressed into the discharge hole 226 from between the roll gaps, enters the discharge chamber 223, and finally enters the material receiving box 3.

[0040] The part where the small end of the tapered roller is located is the feeding end. At this place, the preliminarily mixed active particles, conductive agent and PTFE binder are added. The raw material enters the working chamber and is extruded by the planetary rollers. By using the radial force and tangential force on the material to form a shearing effect, the raw material particles are subjected to cross extrusion, which is beneficial to fibrillation. Before the material is poured into the feeding hopper, a small amount of segregation occurs to the preliminarily mixed material particles during transportation or stirring. The particles change from the original adhesion state to a dispersed state. The mixed material without fibrillation is not stable. The fibrillation device can play a role in uniformly mixing the material, can perform secondary stirring on the material, compensate for the segregation occurring during the stirring process, and is beneficial to the uniformity and consistency of the mixed material.

[0041] The fibrillation device uses each planetary roller to cooperate with the central roller to achieve efficient fibrillation. It does not require the rollers to have a very high rotational speed, avoiding the fiber structure formed by the PTFE binder under the action of high-speed and large shear force from damaging the surface modification state of the electrode material particles. It improves the stirring effect, reduces the shear strength, protects the surface modification state of the electrode material, and realizes the microscopic mixing uniformity of each component raw material and the sufficient and uniform wire drawing of the fibrillar substance. The shear force intensity generated by the movement of the planetary rollers can protect the surface modification state of the electrode material and contribute to the fibrillation of the PTFE binder into fibrils.

[0042] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions recorded in the foregoing embodiments without creative efforts, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fibrillation device, characterized in that, It includes a housing, and a roll pressing planetary mechanism is provided inside the housing. The roll pressing planetary mechanism includes a central roll, a planetary carrier, and at least two planetary rolls mounted on the planetary carrier and located around the central roll. A sun gear is provided on the central roll, an internal gear ring is provided on the inner wall of the housing, and planetary gears meshing with the sun gear and the internal gear ring are provided on the planetary rolls so that the planetary rolls rotate self - and revolve around the central roll under the action of power. A working chamber is formed between the central roll and the housing. The fibrillation device has a feed channel for feeding materials into the working chamber and a discharge channel for discharging materials from the working chamber. The planetary rolls are in the working chamber to cooperate with the central roll to roll - press the materials to fibrillate them.

2. The fibrillation device according to claim 1, characterized in that, Both the central roll and the planetary rolls are conical roll structures. The conical roll structure includes a conical section, and the two ends of the conical section are respectively a large - diameter end and a small - diameter end. The large - diameter end of the conical section of the central roll corresponds to the small - diameter end of the conical section of the planetary roll, and the small - diameter end of the conical section of the central roll corresponds to the large - diameter end of the conical section of the planetary roll. A region for roll - pressing materials is formed between the conical section of the central roll and the conical section of the planetary roll.

3. The fibrillation device according to claim 2, characterized in that, The region of the working chamber corresponding to the small - diameter end of the conical section of the planetary roll communicates with the feed channel, and the region of the working chamber corresponding to the large - diameter end of the conical section of the planetary roll communicates with the discharge channel.

4. The fibrillation device according to claim 2 or 3, characterized in that, The inner wall of the housing has a conical roll - pressing wall surface adapted to the conical section of the planetary roll, and this roll - pressing wall surface is used to cooperate with the conical section of the planetary roll to roll - press the materials.

5. The fibrillation device according to claim 2 or 3, characterized in that, The planetary gears are provided at both ends of the planetary roll and the planetary gears at both ends are the same. Internal gear rings and sun gears adapted to the planetary gears at both ends of the planetary roll are respectively provided on the housing and the central roll. Gear mounting parts with the same diameter are respectively provided on both axial sides of the conical section of the central roll for mounting the sun gears.

6. The fibrillation device according to claim 1 or 2 or 3, characterized in that, There are two planetary carriers of the roll - pressing planetary mechanism. The two ends of the planetary roll are respectively mounted on the two planetary carriers. The planetary carrier is a circular - ring structure and is rotatably sleeved on the central roll. Limiting structures for axially limiting the planetary carrier are respectively provided on both opposite sides of the two planetary carriers on the central roll.

7. The fibrillation device according to claim 1 or 2 or 3, characterized in that, The central roll is horizontally arranged. The central roll has a central inner cavity. A partition is provided in the central inner cavity and a feed cavity and a discharge cavity are respectively formed on both sides of the partition. Feed holes penetrating the cavity wall of the feed cavity and the outer peripheral surface of the central roll and discharge holes penetrating the cavity wall of the discharge cavity and the outer peripheral surface of the central roll are provided on the central roll. The feed channel includes the feed cavity and the feed holes, and the discharge channel includes the discharge cavity and the discharge holes.

8. The fibrillation device according to claim 7, characterized in that, One end of the central roll corresponding to the feed cavity is connected with an inlet pipe. A conveying mechanism for pushing materials into the working chamber is provided in the inlet pipe. The feed channel includes the inner cavity of the inlet pipe.

9. The fibrillation device according to claim 8, characterized in that, One end of the inlet pipe far from the central roll is connected with a feed hopper. The feed hopper has an upward - opening vertical opening for materials to enter.

10. The fibrillation device according to claim 1 or 2 or 3, characterized in that, The inner wall of the housing has a roll - pressing wall surface adapted to the outer peripheral surface of the planetary roll, and this roll - pressing wall surface is used to cooperate with the outer peripheral surface of the planetary roll to roll - press the materials.

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