Lithium battery pole piece dry manufacturing process and manufacturing equipment assembly

Abstract

The invention discloses a lithium battery pole piece dry method manufacturing process and a manufacturing equipment assembly, and the lithium battery pole piece dry method manufacturing process comprises the following steps: a powder material preparation part: mixing raw materials, kneading and fiberizing to form a powder material; the film material preparation part is used for extruding the powder material from a discharging channel to a material receiving surface, a metering gap is formed between the discharging channel and the material receiving surface, and the material receiving surface can move relative to the discharging channel, so that the powder material is spread to the material receiving surface, the powder material on the material receiving surface is rolled, and the powder material is changed into a film material. According to the lithium battery pole piece dry method manufacturing process and the manufacturing equipment assembly, the thickness of a film material can be controlled, the thickness deviation of the film material is reduced, and the influence on the product quality is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing technology, and in particular to a dry manufacturing process for lithium battery pole pieces and a manufacturing equipment assembly. Background Art

[0002] When producing lithium battery pole pieces, the following steps are usually included: 1. Dry mixing: The active material powder is mixed with the conductive agent, and then the binder is added. This step does not involve the use of solvents. Compared with the traditional wet process, the slurry preparation and solvent recovery processes are omitted.

[0003] 2. Adhesive fibrillation: On the basis of dry mixing, an external high shear force is applied to the mixture to make the adhesive fibrillate and then bond the electrode membrane powder to form a self-supporting membrane.

[0004] 3. Rolling: The formed self-supporting film is covered on the surface of the current collector by rolling to form an electrode film. During the rolling process, the active material, conductive agent and adhesive are mixed under high shear force, and the formed self-supporting film is attached to the roller and repeatedly rolled.

[0005] As another dry film-making method, electrostatic spraying can also be used. The electrostatic spraying method uses high-pressure gas to premix active materials, conductive agents and adhesive particles. Under the action of an electrostatic spray gun, the powder is negatively charged and sprayed onto a positively charged metal foil current collector. The current collector loaded with the adhesive is then hot-pressed. After the adhesive melts, it will adhere to other powders and be squeezed into a self-supporting film.

[0006] 4. Cutting system: The formed wide electrode film is cut into narrow electrode films as required to meet the needs of battery manufacturing.

[0007] 5. Lamination and winding: In some processes, it also includes the steps of laminating the electrode film and the current collector and winding the electrode. This step can improve the efficiency of dry electrode production, reduce the circulation time of the electrode between equipment, reduce powder loss, and better control the product yield and detect indicators such as the thickness and rolling uniformity of the electrode.

[0008] However, the film thickness deviation on the foil is large, which affects the product quality. Summary of the invention

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a dry manufacturing process for lithium battery pole pieces, which can control the film material thickness, reduce the film material thickness deviation, and avoid affecting the product quality.

[0010] In a first aspect, a dry manufacturing process for a lithium battery pole piece according to an embodiment of the present invention comprises: In the powder preparation part, the raw materials are mixed, kneaded and fiberized to form powder; In the film material preparation part, the powder is squeezed out from the discharge channel to the receiving surface, and a metering gap is formed between the discharge channel and the receiving surface. The receiving surface can move relative to the discharge channel so that the powder is spread to the receiving surface and the powder on the receiving surface is calendered to turn the powder into film material.

[0011] A dry manufacturing process for lithium battery pole pieces according to an embodiment of the present invention has at least the following beneficial effects: The present invention sets a metering gap, so that the thickness of the powder on the material connection surface can be determined by the metering gap. At the same time, since the material connection surface can move relative to the discharge channel, the powder can be spread on the material connection surface with equal thickness. Furthermore, when the powder on the material connection surface is rolled, the powder at each position of the material connection surface is evenly rolled, thereby reducing the thickness deviation at each position and ensuring product quality.

[0012] According to a dry manufacturing process for a lithium battery pole piece of an embodiment of the present invention, the discharge channel has a length dimension, and the length dimension of the discharge channel can be adjusted to adjust the extrusion parameters.

[0013] Advantageously, the present invention can change the discharge resistance and the film-forming density by changing the length of the discharge channel to obtain film materials with different densities.

[0014] According to a dry manufacturing process for a lithium battery pole piece of an embodiment of the present invention, the discharge channel has a width dimension, and the width dimension of the discharge channel can be adjusted to adjust the extrusion parameters.

[0015] Advantageously, the present invention can change the discharge cross-sectional area and discharge amount by changing the width of the discharge channel, thereby changing the film density.

[0016] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, the distance between the discharge channel and the material connection surface can be adjusted.

[0017] Advantageously, the present invention changes the distance between the discharge channel and the material receiving surface by making the distance between the discharge channel and the material receiving surface adjustable, thereby changing the discharge thickness and adjusting the film thickness so that the film thickness meets the manufacturing requirements of different products.

[0018] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, extruding powder from a discharge channel to a receiving surface includes: extruding the powder from the discharge channel to the receiving surface by vibration.

[0019] Advantageously, the present invention uses vibration to extrude the powder from the discharge channel to the receiving surface, so that the powder can be densely and evenly distributed at various positions of the discharge channel, and further, the powder is evenly distributed on the receiving surface, so that the thickness of the powder in the moving direction of the receiving surface and the direction perpendicular to it is uniform, thereby reducing manufacturing differences.

[0020] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, the feed side of the discharge channel is connected to a feed channel, an angle is set between the feed channel and the discharge channel, an extrusion space is set between the feed channel and the discharge channel, the extrusion space accommodates an extrusion head, and the extrusion head extrude the powder in the feed channel into the discharge channel.

[0021] Advantageously, the present invention provides a feed channel, an extrusion space and an extrusion head, and also facilitates the action of the extrusion head, so that the powder in the feed channel is continuously supplied to the discharge channel, so that the discharge channel can continuously discharge material, thus meeting the needs of continuous production.

[0022] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, calendering the powder material on the material connection surface includes: using at least one pair of calendering rollers to extrude the powder material on the material connection surface, and the roller surface speeds of the pair of calendering rollers are set differently.

[0023] Advantageously, the present invention sets calendering rollers so that the roller surface speeds of the calendering rollers are different. Therefore, the calendering rollers all rotate. On the one hand, the calendering rollers can extrude the powder, change the thickness of the powder, and reduce the thickness difference of the powder. On the other hand, the powder can pass through the calendering rollers smoothly and be calendered into a continuously extended film to meet the requirements of composite with foil.

[0024] The speed difference of the calendering rollers causes displacement on both sides of the powder, which can shear the powder with high intensity, generate heat and melt inside the powder, make the fiberization more uniform, further improve the film strength, and facilitate the production of film materials.

[0025] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, the material connection surface is a roller surface, and the dry manufacturing process also includes a transfer composite part, which rolls and composites the film material and the foil material, and the transfer composite part can transfer heat between the film material and the foil material.

[0026] Advantageously, the present invention makes the material connection surface a roller surface, so that after the film material is formed, the film material can be compounded with the foil material to produce the desired electrode film, so as to produce the pole piece.

[0027] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, in the powder preparation part, before the raw materials are mixed, the incoming materials are screened to obtain raw materials with uniform particle sizes, and the raw materials with uniform particle sizes are used for mixing.

[0028] Advantageously, the present invention helps to unify the specifications of incoming materials by screening the incoming materials, thereby reducing the impact of incoming material differences on product quality.

[0029] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, screening the incoming materials includes: allowing the incoming materials to flow with the airflow, so that particles of the incoming materials collide with each other, break or adhere to each other.

[0030] Advantageously, the present invention can change the distribution of particle sizes in the incoming material by causing the particles of the incoming material to collide with each other under the influence of airflow, so that the particle sizes are similar, thereby providing more powder materials that meet production needs.

[0031] At the same time, the incoming particles are driven by the airflow to collide with each other, without introducing foreign matter, thus avoiding affecting the quality of the powder.

[0032] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, particles are separated by centrifugal force.

[0033] Advantageously, the present invention separates particles by centrifugal force, and can also facilitate obtaining powder materials of required particle specifications, thus meeting the needs of production and manufacturing.

[0034] Moreover, the centrifugal force can be conveniently adjusted as needed to provide powders of different specifications, making it easy to use.

[0035] According to a dry manufacturing process for a lithium battery pole piece of an embodiment of the present invention, particles are screened through sieve holes.

[0036] Advantageously, the present invention can screen particles through the sieve holes, and can also accurately control the size of the particles, thereby reducing the difficulty of adjustment.

[0037] Moreover, by replacing the parts with sieve holes, the discharging can be easily changed, which is convenient and quick.

[0038] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, in the powder preparation part, mixing the raw materials includes: pneumatic mixing, and the pneumatic mixing includes: mixing on a fluidized bed by pneumatic boiling and homogenizing and spreading.

[0039] Advantageously, the present invention mixes the raw materials by pneumatic mixing and utilizes airflow boiling to uniformly mix the various raw materials together, so that the components are evenly distributed and have high consistency.

[0040] Homogenized spreading also helps shorten the time it takes to achieve uniform mixing and improve mixing efficiency.

[0041] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, in the powder preparation part, mixing the raw materials includes: vacuum low-pressure mixing, vacuum low-pressure mixing, including gravity mixing without stirring in the form of vacuum or low pressure and standing.

[0042] Advantageously, the present invention adopts vacuum low-pressure mixing, which helps to reduce the gas in the powder, can reduce the gas and air resistance between the materials, improve the fluidity and dispersibility of the materials, and make the various components of the powder mixed evenly.

[0043] Using gravity to mix without stirring can reduce friction and wear, which not only meets the mixing needs but also avoids the introduction of impurities.

[0044] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, in the powder preparation part, after kneading and fiberization, the fiberized raw materials are granulated and screened.

[0045] Advantageously, the present invention granulates and screens the fiber raw materials, thereby ensuring that the particle size of the powder used for film formation meets the needs of production and manufacturing, thereby reducing the impact of particle differences on film quality.

[0046] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, granulation and screening of fiberized raw materials include: generating a vortex granulation airflow in a first cylinder, so that the fiberized raw material flows with the vortex granulation airflow for granulation, the first cylinder is provided with sieve holes, and the particles generated by granulation enter the second cylinder through the sieve holes, the second cylinder is mounted outside the first cylinder, and a vortex separation airflow is formed between the first cylinder and the second cylinder, and the vortex separation airflow takes away the particles passing through the sieve holes for collection to form the required powder.

[0047] Advantageously, the present invention adopts a first cylinder and a second cylinder, so that a vortex granulation airflow is provided in the first cylinder, and a vortex separation airflow is formed between the first cylinder and the second cylinder. Thus, the needs of granulation and screening are met, and it is convenient to realize them on the same equipment, reducing intermediate links and avoiding affecting the film quality.

[0048] According to a dry manufacturing process for lithium battery pole pieces of an embodiment of the present invention, in the powder preparation part, the raw material transfer is performed in a steady state manner, and the raw material transfer in a steady state manner includes: compacting the raw material and then transferring it, and / or transferring the raw material in a gas-free or vacuum manner.

[0049] Advantageously, the present invention uses a steady-state method to transport raw materials, which helps reduce the segregation of powders, helps ensure the mixing effect, makes the powders more consistent, and helps improve the film-forming quality.

[0050] In the second aspect, the present application also provides a lithium battery pole piece dry manufacturing equipment assembly, which is used to implement the lithium battery pole piece dry manufacturing process provided in the first aspect. The lithium battery pole piece dry manufacturing equipment assembly includes a powder material preparation device and a film material preparation device. The powder material preparation device is used to implement the powder material preparation part, and the film material preparation device is used to implement the film material preparation part.

[0051] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A schematic diagram of a dry manufacturing process for a lithium battery electrode according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the equipment structure for performing incoming material screening; Figure 3 for Figure 1 Schematic diagram of the equipment structure for performing screening and granulation; Figure 4 for Figure 2 Schematic diagram of the internal structure of the screening and granulation equipment; Figure 5 for Figure 1 A schematic diagram of a structure of a metering extrusion structure for performing metering extrusion; Figure 6 for Figure 5 A local enlarged view of point A; Figure 7 For application Figure 5 A schematic structural diagram of a first example of a metering extrusion film-forming device of a metering extrusion structure; Figure 8 For application Figure 5 A schematic structural diagram of a second example of a metering extrusion film-forming device with a metering extrusion structure.

[0054] Reference numerals: 100 - classification air duct, 110 - centrifugal fan, 120 - air inlet, 130 - circulation air duct, 140 - feeding air duct, 150 - shielding member, 160 - separation screen, 170 - collection box, 180 - first opening, 190 - impact air nozzle, 200 - air supply air duct, 210 - circular air duct portion; 300 - granulation chamber, 310 - separation chamber, 320 - sieve hole, 330 - air inlet opening, 340 - first airflow, 350 - second airflow, 360 - first cylinder, 370 - first end cover, 380 - feed port, 390 - feed pipe, 400 - feed screw, 410 - feed hopper, 420 - second cylinder, 430 - aggregate shell, 440 - aggregate chamber, 450 - air inlet nozzle; 500-metering extrusion structure, 510-material storage space, 511-feeding channel, 5111-avoidance gap, 520-discharging channel, 521-discharging port, 530-extrusion space, 600-metering extrusion film-forming device, 610-material receiving surface, 620-extrusion head, 621-ultrasonic transducer, 622-ultrasonic amplitude transformer, 623-fixed bracket, 630-support roller, 631-heat exchange channel. DETAILED DESCRIPTION

[0055] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0056] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] A dry manufacturing process for a lithium battery electrode according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0060] Reference Figure 1 In the first aspect, the present invention aims to provide an embodiment of a dry manufacturing process for lithium battery pole pieces.

[0061] In this embodiment, a dry manufacturing process for lithium battery pole pieces mainly includes a powder material preparation part and a film material preparation part.

[0062] In some embodiments, the dry manufacturing process may further include a transfer composite part, thereby being applicable to the case where the film material is not directly spread on the foil.

[0063] As for the powder preparation part, the powder preparation part mainly includes the incoming material screening step, the dual-condition mixing step, the kneading fiberization step and the screening granulation step.

[0064] For the incoming material screening step, specifically, use Figure 2 A screening device is provided, and the screening device can be a part of a dry manufacturing device for lithium battery pole piece materials. Therefore, the present invention also aims to provide an embodiment of the dry manufacturing device for lithium battery pole piece materials, and the dry manufacturing device for lithium battery pole piece materials includes a screening device.

[0065] Compared with the prior art, the screening device of the present invention can realize multi-level screening of powder, has strong versatility, and is easy to promote and apply. At the same time, the dry manufacturing equipment of lithium battery pole piece materials of the present invention can screen out powders of different grades or specifications by applying the above screening device, so as to meet the needs of lithium battery pole piece material production and manufacturing, and there is no need to prepare a screening device for each specification, thereby reducing equipment costs. At the same time, the screening device of the present invention omits the shearing device in the prior art, has a simple and concise structure, and has low energy consumption.

[0066] In this embodiment, the screening device mainly includes a shell component, a centrifugal component and a crushing component.

[0067] The shell assembly has a classified air duct 100, and a gas-material mixed airflow flows in the classified air duct 100.

[0068] In some embodiments, the grading air duct 100 may be connected to an air pump to facilitate blowing up the powder, so that a gas-material mixed airflow flows in the grading air duct 100 for screening.

[0069] In some embodiments, the grading air duct 100 can be extended up and down, with the inlet of the grading air duct 100 located at the bottom or arranged lower, and the outlet of the grading air duct 100 located at a fixed position or arranged upper, so that when the air pump stops working, the powder will fall to the inlet of the grading air duct 100 for discharge or re-screening, and the powder will not block the outlet of the grading air duct 100.

[0070] In some embodiments, the housing assembly may include a circulating air duct 130 , which connects the inlet and outlet of the grading air duct 100 , thereby allowing the airflow in the screening device to circulate and reduce leakage to the outside.

[0071] In detail, the circulation air duct 130 has a feeding air port 140 communicating with the inlet of the classification air duct 100 .

[0072] This embodiment also facilitates the circulation of airflow by providing a circulating air duct 130. On the one hand, it can reduce or even eliminate gas purification equipment, reduce manufacturing costs and use costs (the use costs include consumed energy and consumables), and save space.

[0073] In some embodiments, the circulating air duct 130 and the grading air duct 100 can be configured in a one-to-one ratio, or in unequal proportions. For example, there are multiple circulating air ducts 130 around the grading air duct 100 to reduce air circulation resistance and facilitate air supply to the crushing assembly.

[0074] In some embodiments, the feeding air outlet 140 may be provided with a shielding member 150 , and a gap between the shielding member 150 and the feeding air outlet 140 allows airflow to flow into the classification air duct 100 .

[0075] By setting the shielding member 150, the effective cross-sectional area of ​​the feeding air outlet 140 can be reduced in this embodiment, so that a narrow gap is formed between the shielding member 150 and the feeding air outlet 140, so as to facilitate blowing the falling powder toward the crushing component and prevent the powder from falling below the air inlet 120 and being difficult to be crushed, thereby achieving efficient screening.

[0076] At the same time, the shielding member 150 can also shield the feeding air port 140 to prevent foreign matter from falling into the circulating air duct 130 .

[0077] In some embodiments, the shielding member 150 can be conical, with the large end of the shielding member 150 disposed close to the circulating air duct 130 and the small end of the shielding member 150 closed and away from the circulating air duct 130. Therefore, when the powder falls onto the shielding member 150, it is easy to fall into the gap between the shielding member 150 and the feeding air outlet 140, making it convenient to blow the powder up again and preventing the powder from remaining on the shielding member 150.

[0078] In some embodiments, the shielding member 150 may be located upstream of the intersecting airflow so that the airflow of the feed tuyere 140 is staggered from the intersecting airflow, and the intersecting airflow is generated by the crushing assembly.

[0079] In this embodiment, the shielding member 150 is provided to shield the airflow of the feeding air port 140, so as to prevent the airflow from directly impacting the intersection of the intersecting airflows and thus preventing the particles from colliding with each other.

[0080] Reference Figure 2 On the flow path of the gas-material mixed airflow, the inlet of the grading air duct 100, the crushing assembly and the centrifugal assembly are arranged in sequence from bottom to top. At the same time, it also shows that the crushing assembly is arranged upstream of the centrifugal assembly.

[0081] In this embodiment, the grading air duct 100 is arranged up and down so that the inlet of the grading air duct 100 is lowered. Therefore, under the action of gravity, heavier powder will return to or approach the crushing component to be crushed again, and the material will be crushed in a secondary bonding state, so that the particle size difference of the gas-material mixed airflow flowing to the centrifugal fan 110 is small, which can increase the output.

[0082] In some embodiments, the classified air duct 100 may be extended horizontally or arranged obliquely, but the adhesion effect of the classified air duct 100 needs to be considered.

[0083] The crushing assembly includes at least two air inlets 120 . The two air inlets 120 can generate intersecting airflows. The intersecting airflows can drive the raw materials to collide with each other. The intersecting airflows are used to form a gas-material mixed airflow.

[0084] In some embodiments, the number of the air inlets 120 may be three or more, so that the intersecting airflows may be the intersection of two airflows or the intersection of multiple airflows.

[0085] The present invention can form intersecting airflows by arranging a crushing component, that is, at least two airflows containing material intersect during the flow process. As a result, powders in the two airflows containing material collide with each other, which can not only impact large particles into small particles, but also adhere fine particles into small particles, so that the specifications of the powders tend to be consistent, which helps to improve the output efficiency of the screening device.

[0086] Furthermore, the present invention can also change the particle size of the generated powder by adjusting the wind speed or strength of the intersecting airflows to meet the output needs, and the output efficiency will not be affected by changes in demand.

[0087] At the same time, the intersecting airflow changes the particle size in a manner that does not require the use of upper and lower shear wings in the prior art, thereby preventing the upper and lower shear wings from being worn and introducing impurities, thereby avoiding affecting the quality of the powder.

[0088] At the same time, the present invention eliminates the need for a shearing device and corresponding power, which can simplify the structure, reduce manufacturing costs, reduce energy consumption, reduce use costs, and is easy to promote and apply.

[0089] In some embodiments, the crushing assembly may include an impact nozzle 190 , a port of the impact nozzle 190 is used to form the air inlet 120 , and the port of the impact nozzle 190 is disposed near the center of the graded air duct 100 .

[0090] In this embodiment, the impact nozzle 190 is arranged so that the port of the impact nozzle 190 is arranged close to the center of the graded air duct 100, which helps to shorten the distance between the air inlets 120, shorten the length of the route from the air inlet 120 to the intersection of the air flows, and ensure the intensity of the collision between particles in the intersecting air flows.

[0091] In some embodiments, the port of the impact nozzle 190 can be biased toward the centrifugal assembly, so that the powder flows with the wind and the powder reaches the centrifugal assembly more easily.

[0092] In some embodiments, the crushing assembly may include an air supply duct 200 connected to the air inlet 120 , and the air supply duct 200 is provided with a feeding port for feeding powder.

[0093] This embodiment provides a feeding port in the air supply duct 200, so that powder can be easily fed into the grading duct 100. At the same time, it ensures that the fed powder is crushed by the crushing assembly, with high crushing efficiency and avoiding omissions. There is no need to open the grading duct 100 for feeding, which helps to reduce downtime.

[0094] In some embodiments, the air supply duct 200 may include a circular annular duct portion 210 , and the air inlets 120 may be arranged along the circumference of the circular annular duct portion 210 .

[0095] In this embodiment, the annular air duct portion 210 is provided to facilitate the connection and communication of the air inlet 120, thereby reducing the manufacturing difficulty. At the same time, the air inlet 120 can be increased or decreased as needed to meet different usage requirements.

[0096] In some embodiments, the air supply duct 200 may include a polygonal duct portion to reduce manufacturing difficulty.

[0097] In some embodiments, the circulation air duct 130 may include an air supply air duct 200 , thereby eliminating the need to separately provide an air source for the crushing assembly, thereby simplifying the configuration.

[0098] In some embodiments, an air flow distribution valve may be provided on the circulation air duct 130 so as to provide air flow to the classification air duct 100 and to the crushing assembly in a balanced manner in a quantitative or proportional manner.

[0099] In some embodiments, the housing assembly may be provided with a cold source or a heat source to meet the temperature requirements of the powder so that the powder maintains the state required for production.

[0100] As for the centrifugal assembly, the centrifugal assembly includes a centrifugal fan 110 . The centrifugal fan 110 is disposed in the classification air duct 100 . When the gas-material mixed airflow passes through the centrifugal fan 110 , the centrifugal fan 110 rotates to perform centrifugal classification.

[0101] In some embodiments, a powder collecting component may be provided in the radial direction of the centrifugal fan 110 to facilitate the collection of larger and heavier powders.

[0102] In this embodiment, a centrifugal assembly is provided so that the centrifugal assembly has a centrifugal fan 110. Therefore, when the centrifugal fan 110 rotates, the centrifugal force can be used to separate larger and heavier powders from the gas-material mixed airflow. At the same time, during use, the speed of the centrifugal fan 110 can be adjusted to change the magnitude of the centrifugal force, and the particle size of the separated powder can be adjusted. Therefore, powders of different specifications can be screened out to achieve multi-stage screening.

[0103] The invention uses the centrifugal principle to perform screening, thereby reducing the dependence on the sieve holes and avoiding the clogging of the sieve holes to affect the output efficiency.

[0104] Furthermore, the output of the present invention may be more than one, such as larger or heavier particles separated by the centrifugal fan 110 , and lighter or smaller particles remaining in the gas-material mixed airflow after passing through the centrifugal fan 110 .

[0105] In this embodiment, the grading air duct 100 is composed of multiple concentric pipe sections, with a simple structure and a short air flow path, which helps to reduce air flow resistance and reduce powder adhering to the wall of the grading air duct 100. At the same time, the screening device has a compact structure, a small size, and is easy to arrange.

[0106] In some embodiments, the pipe sections can be arranged to have equal diameters, gradually contract or expand to meet the needs of spatial arrangement.

[0107] In some embodiments, the classified air duct 100 may have a centrifugal section for accommodating the centrifugal fan 110 . In the centrifugal section, the gas-material mixed airflow passes through the centrifugal fan 110 along the axial direction of the centrifugal fan 110 .

[0108] In this embodiment, the gas-material mixed airflow passes through the centrifugal fan 110 along the axial direction of the centrifugal fan 110. Therefore, the centrifugal force of the centrifugal fan 110 can be used to screen larger and heavier powders, and the flow of the gas-material mixed airflow can be used to continue to drive the flow of fine powders, thereby separating two powders with different particle sizes. At the same time, the special setting of the airflow direction produces the desired separation effect, with less modification to the entity and a simple and concise structure.

[0109] At the same time, after the gas-material mixed airflow passes through the centrifugal fan 110 , the gas-material mixed airflow is in a spiral ascending state and can be centrifugally screened without being limited by the size of the centrifugal fan 110 .

[0110] In some embodiments, the centrifugal fan 110 may include a plurality of blades, which are flat plates extending along the axis of the centrifugal fan 110 to increase the effect of driving the air-material mixed airflow to rotate and enhance the centrifugal action.

[0111] In some embodiments, the centrifugal section may be provided with a rear disassembly cover to facilitate cleaning and replacement of the centrifugal fan 110 and the impact nozzle 190 .

[0112] In some embodiments, a separation screen 160 may be disposed in the classification air duct 100 , and the separation screen 160 is located downstream of the centrifugal fan 110 .

[0113] In this embodiment, by providing the separation screen 160, the powder can be screened more accurately to reduce the possibility of mixing.

[0114] At the same time, when the operating parameters of the screening device are constant, the particle size of the powder in the gas-material mixed airflow passing through the centrifugal component is determined, and the separation screen 160 can be omitted to reduce the airflow resistance, improve the screening efficiency, and simplify the structure of the screening device.

[0115] In some embodiments, the separation screen 160 may be in a conical shape, with a small end of the separation screen 160 disposed away from the centrifugal fan 110 and a large end of the separation screen 160 disposed close to the centrifugal fan 110 .

[0116] In this embodiment, the separation screen 160 is provided so as to be conical, thereby increasing the surface area of ​​the separation screen 160 without increasing the diameter of the grading air duct 100, increasing the number of sieve holes and the filtering area, reducing the air flow resistance, and facilitating the collection of powder.

[0117] The small end of the separation screen 160 is away from the centrifugal fan 110 , and the space between the collecting box 170 and the separation screen 160 is increased, which helps the powder to settle to the collecting box 170 .

[0118] In some embodiments, the large end of the separation screen 160 may be disposed away from the centrifugal fan 110 , and the small end of the separation screen 160 may be disposed close to the centrifugal fan 110 .

[0119] The small end of the separation screen 160 is close to the centrifugal fan 110 , so that the airflow can be dispersed toward the edge of the separation screen 160 , making it convenient for the powder to directly fall into the collecting box 170 .

[0120] In some embodiments, a separation screen 160 and a collection box 170 may be provided in the grading air duct 100 . The separation screen 160 and the collection box 170 are located downstream of the centrifugal fan 110 . The collection box 170 is located between the separation screen 160 and the centrifugal fan 110 . The collection box 170 is used to collect powder that has not passed through the separation screen 160 .

[0121] By providing the separation screen 160 and the collecting box 170 , this embodiment can also facilitate the collection of powder materials with relatively uniform particle diameters, reduce the proportion of excessively fine particles in the powder materials, and help reduce segregation.

[0122] In some embodiments, the collecting box 170 may be provided with a first opening 180 , and the first opening 180 is used to allow the gas-material mixture flow to flow toward the separation screen 160 .

[0123] By providing the first opening 180 , this embodiment reduces obstruction to the gas-material mixed airflow, facilitates the gas-material mixed airflow to flow toward the separation screen 160 , and at the same time, when the powder falls from the separation screen 160 , it helps the powder fall into the collecting box 170 .

[0124] In some embodiments, the first opening 180 may allow a driving shaft of the centrifugal fan 110 to pass therethrough to connect power.

[0125] The first opening 180 is provided in this embodiment to facilitate the arrangement of the drive shaft of the centrifugal fan 110 and facilitate assembly and disassembly. At the same time, the impact of the gas-material mixed airflow on the drive shaft is reduced to avoid wear of the drive shaft.

[0126] In some embodiments, the aggregate box 170 may include two half boxes, thereby facilitating the formation of the first opening 180 and facilitating assembly and disassembly.

[0127] In some embodiments, the collecting box 170 may have a discharge slope to facilitate the discharge of the powder.

[0128] In some embodiments, the side wall of the grading air duct 100 may have a drawer-type structure to facilitate moving in or out of the collecting box 170 .

[0129] For the dual-condition mixing step, the dual-condition mixing step mainly includes a pneumatic mixing process and a vacuum low-pressure mixing process.

[0130] For pneumatic mixing, pneumatic mixing is mostly in the form of an entrained bed, so that a variety of incoming materials are mixed on the fluidized bed in the form of pneumatic boiling and material spreading and homogenization.

[0131] In this embodiment, the raw materials are mixed by pneumatic mixing and airflow boiling is used to evenly mix the various raw materials together, so that the components are evenly distributed and have high consistency.

[0132] Homogenized spreading also helps shorten the time it takes to achieve uniform mixing and improve mixing efficiency.

[0133] For vacuum low-pressure mixing, this embodiment uses vacuum low-pressure to perform gravity mixing without stirring, and after the mixing is completed, it is left to stand for a period of time to allow the mixed state to settle.

[0134] This embodiment uses vacuum low-pressure mixing to help reduce the gas in the powder, reduce the gas and air resistance between the materials, improve the fluidity and dispersibility of the materials, and make the various components of the powder mixed evenly.

[0135] Using gravity to mix without stirring can reduce friction and wear, which not only meets the mixing needs but also avoids the introduction of impurities.

[0136] In some specific embodiments, pneumatic mixing and vacuum low-pressure mixing can be used separately, or pneumatic mixing can be used first and then vacuum low-pressure mixing to meet different mixing needs.

[0137] For temperature sensitive materials, pneumatic mixing and vacuum low pressure mixing should adopt low temperature environment.

[0138] For the kneading and fiberizing step, a screw can be used to knead and fiberize the mixed materials with low shear intensity. At the same time, for temperature-sensitive materials, a high-temperature atmosphere can be used, and for materials with a high gas content, it can be carried out in a vacuum environment.

[0139] For the sieving and granulation step, specifically, use Figure 3 and Figure 4 A screening and granulation device is shown, and the screening and granulation device can be a part of the dry manufacturing equipment for lithium battery pole pieces. Therefore, the present invention also aims to provide an embodiment of the dry manufacturing equipment for lithium battery pole pieces, and the dry manufacturing equipment for lithium battery pole pieces includes the screening and granulation device.

[0140] Compared with the prior art, the screening and granulation device of the present invention can simplify the structure, reduce manufacturing costs, and reduce energy consumption. At the same time, the dry manufacturing equipment for lithium battery pole pieces of the present invention can continuously and compactly complete the granulation process and the screening process by applying the screening and granulation device, which is conducive to reducing the equipment footprint, simplifying the equipment structure, reducing the equipment manufacturing cost, and helping to reduce the energy consumption.

[0141] In this embodiment, the screening and granulation device includes a shell component and an air intake component.

[0142] Unless otherwise specified, this embodiment gives priority to examples of solutions suitable for the dry process of lithium battery pole pieces. Then, for the technical solutions given as examples, this embodiment also proposes parallel technical solutions. The technical effects of the parallel technical solutions are equivalent or basically meet the needs, or, alternatively, enable the screening and granulation device to be promoted and applied in other fields.

[0143] In some embodiments, the housing assembly may include a feed hopper 410 having a large inlet and a small outlet, so as to facilitate the input of raw materials for producing lithium battery pole pieces and prevent the raw materials from spilling.

[0144] In some embodiments, the feed hopper 410 may include four inclined side walls to meet the feeding requirements and facilitate manufacturing.

[0145] In some embodiments, the housing assembly may include a feed pipe 390 that guides the raw materials from the feed hopper 410 into the screening and granulation device.

[0146] In some embodiments, a feed screw 400 may be disposed in the feed pipe 390 , and the feed screw 400 is connected to a motor. Driven by the motor, the feed screw 400 rotates, and the raw material may be moved along the feed pipe 390 to complete the feeding.

[0147] At the same time, due to the spiral extrusion of the feed screw 400, the raw material is easily broken and refined, so that the particle diameter of the raw material becomes smaller, which is close to the state of the powder required for production, reducing the difficulty of granulation.

[0148] In some embodiments, the feed pipe 390 can be arranged horizontally, so that the feed amount of the screening granulation device is more uniform and the feed fluctuation is reduced, which can avoid both excessive feed affecting the granulation efficiency and insufficient feed affecting the production capacity.

[0149] In some embodiments, the feed pipe 390 can be tilted relative to the horizontal direction or even in an upright state to meet the granulation requirements of different raw materials.

[0150] In some embodiments, the shell assembly can include a first barrel 360, a first end cap 370 covering one end of the first barrel 360, and a second end cap covering the other end of the first barrel 360, wherein the first end cap 370 is connected to a feed pipe 390, and a feed port 380 is provided on the first end cap 370, and the feed port 380 connects the feed pipe 390 and the interior of the first barrel 360, so that the raw material enters the first barrel 360 from the feed pipe 390.

[0151] In some embodiments, the feed port 380 may be provided with an inner insert, or the feed pipe 390 may pass through the feed port 380 and extend to near the middle of the first cylinder 360 , thereby preventing the raw materials from being concentrated at one end of the first cylinder 360 .

[0152] In some embodiments, the feed pipe 390 and the first cylinder 360 can be arranged in parallel to reduce manufacturing difficulty.

[0153] The ends of the feed pipe 390 and the first cylinder 360 are provided with flush end surfaces, so that the feed pipe 390 and the first cylinder 360 can be ensured to be parallel, and other auxiliary tools are less needed to assist the installation.

[0154] In some embodiments, an angle may be formed between the feed tube 390 and the first cylinder 360 to meet actual usage requirements.

[0155] For the first cylinder 360, the interior of the first cylinder 360 is used to form a granulation chamber 300. At the same time, a first airflow 340 is formed inside the first cylinder 360. The first airflow 340 flows in the granulation chamber 300. The first airflow 340 can drive the movement of raw materials in the granulation chamber 300 so that the raw materials can produce powder.

[0156] In some embodiments, the first airflow 340 can be made to flow along the circumference of the first cylinder 360, so that a vortex airflow is formed in the granulation chamber 300, that is, a vortex granulation airflow is formed, which is convenient for driving the raw materials to move along the inner surface of the first cylinder 360, so that the raw materials are continuously tumbled and ground to generate the required powder. At least the particle size of the powder can meet the requirements of the dry process of lithium battery pole pieces.

[0157] In some embodiments, the first barrel 360 can be made into a cylinder to reduce the blind area of ​​the flow of the first airflow 340 in the first barrel 360 to avoid the accumulation of raw materials in the blind area. The blind area will reduce the effective space of the granulation chamber 300, affect the production capacity and efficiency, waste raw materials, increase the cleaning workload, and easily cause mixing if the cleaning is not thorough.

[0158] In some embodiments, the first cylinder 360 can be a square cylinder or a polygonal cylinder to meet the production and manufacturing needs of different raw materials.

[0159] In some embodiments, the feed port 380 can be arranged close to the center of the first cylinder 360. Therefore, since the feed port 380 is located at the center of the vortex airflow, the gas flow velocity is low and the air pressure is high, while the air flow velocity close to the first cylinder 360 is high and the air pressure is low. Therefore, the raw material will expand and diverge more evenly to the surroundings, which is conducive to the rapid dispersion of the raw material and facilitates granulation.

[0160] At the same time, this embodiment also prevents the raw material from being directly on the path of the first airflow 340, thereby reducing the obstruction of the airflow.

[0161] In some embodiments, when the intensity of the first airflow 340 is large enough, the feed port 380 can be arranged away from the center of the first cylinder 360 so as to utilize the airflow to disperse the raw materials to meet different usage requirements.

[0162] In some embodiments, a sieve hole 320 can be arranged on the first cylinder 360, so that the first airflow 340 can not only convert the raw material into the required powder, but also continuously discharge the qualified powder from the sieve hole 320 to the outside of the granulation chamber 300, so that the granulation chamber 300 can continuously granulate and screen.

[0163] In some embodiments, the first cylinder 360 may be made of a porous plate to increase the strength of the first cylinder 360 .

[0164] In some embodiments, the first cylinder 360 can be made of a metal mesh, which can greatly increase the number of sieve holes 320 and facilitate the discharge of powder. Moreover, the metal mesh has mesh specifications, which is convenient for purchase and selection and has low maintenance costs.

[0165] In some embodiments, the first airflow 340 can be made to flow outward through the mesh 320 , so that the gas can be continuously input into the granulation chamber 300 to form the first airflow 340 .

[0166] In some embodiments, the second end cover may be provided with a return air port, which is disposed close to the center of the first cylinder 360 , and is used for the first airflow 340 to flow out of the granulation chamber 300 .

[0167] In this embodiment, the return air port is provided to facilitate the first airflow 340 to be led out, ensuring that the flow rate of the first airflow 340 meets the granulation requirements. At the same time, due to the centrifugal effect, the raw materials are mostly close to the inner surface of the first cylinder 360. Therefore, the return air port is provided close to the center of the first cylinder 360, which is less likely to bring out the raw materials and does not affect the output of the screening granulation device. In this example, due to the view relationship, the return air port is not shown in the figure.

[0168] In some embodiments, the first airflow 340 can enter the separator through the sieve hole 320 and be discharged along the collecting cavity 440, and the return air port can be omitted.

[0169] In some embodiments, the first cylinder 360 can be arranged horizontally, which means that the axis of the first cylinder 360 is close to horizontal, so that the vortex airflow swirls up and down to avoid the deposition of raw materials and the formation of a granulation blind area.

[0170] If the first cylinder 360 is in an upright state, the raw materials will accumulate toward the bottom of the first cylinder 360 due to gravity. The need to drive the raw materials can be met by increasing the velocity and flow rate of the first airflow 340 at this location. However, the space utilization rate at the top of the first cylinder 360 will be insufficient, making the production capacity advantage and energy-saving advantage of the screening and granulation device less prominent.

[0171] In some embodiments, the shell assembly can include a second cylinder 420, and the first cylinder 360 is located inside the second cylinder 420. The first cylinder 360 and the second cylinder 420 are arranged in a package, so that it is convenient to form a separation chamber 310 on the outside of the first cylinder 360 and the inside of the second cylinder 420 to constrain the powder passing through the sieve hole 320, so as to facilitate taking away and collecting, and to facilitate use in the next process.

[0172] A second airflow 350 is also formed in the separation chamber 310 . The second airflow 350 flows along the space between the first cylinder 360 and the second cylinder 420 , so as to conveniently carry away the powder in the separation chamber 310 .

[0173] At the same time, the separation chamber 310 between the first cylinder 360 and the second cylinder 420 is easily vortex-shaped, and it is also convenient to separate the powder from the second airflow 350 by using centrifugal force, so as to facilitate the collection of the powder.

[0174] In some embodiments, the second cylinder 420 can be cylindrical, so that the separation chamber 310 is closer to a vortex shape, that is, a vortex separation airflow is formed. At the same time, it is beneficial to reduce the blind area of ​​​​discharging, reduce powder residue, and make the screening and granulation device compact in structure and occupy a small space.

[0175] In some embodiments, the second cylinder 420 may share the first end cover 370 and the second end cover to form the separation chamber 310 , thereby reducing the number of parts and components and lowering manufacturing costs.

[0176] In some embodiments, the second cylinder 420 can be integrally formed, welded or assembled with one of the first end cover 370 and the second end cover, which is beneficial to maintain the sealing of the screening and granulation device and avoid powder leakage.

[0177] In some embodiments, the first cylinder 360 can be detachably connected to the first end cover 370 and the second end cover, such as by plugging. Specifically, the first end cover 370 and the second end cover are provided with annular grooves for accommodating the ends of the first cylinder 360 to simplify the structure of the first cylinder 360, reduce the difficulty of manufacturing the first cylinder 360, and facilitate disassembly and assembly.

[0178] In some embodiments, a solution in which the first cylinder 360 and the second cylinder 420 are distributed left and right can be formed, but this will limit the arrangement of the separation chamber 310 and the flow of the second airflow 350. At the same time, it will also reduce the distribution area of ​​the sieve holes 320, which is not conducive to maximizing the production capacity and efficiency of the screening and granulation device.

[0179] Reference Figure 4 As for the air intake component, the air intake component is used to pass external gas into the screening and granulation device. The air intake component includes an air intake opening 330, and the air intake opening 330 is connected to the separation chamber 310. The airflow of the air intake opening 330 is directed toward the entity used to form the granulation chamber 300, that is, the airflow of the air intake opening 330 is directed toward the first cylinder 360. Therefore, a part of the airflow from the air inlet opening 330 can enter the granulation chamber 300 to form a first airflow 340, which is used to drive the raw material to move to generate powder, while a part of the airflow from the air inlet opening 330 flows in the separation chamber 310 to form a second airflow 350, which is used to take away the powder in the separation chamber 310.

[0180] In this embodiment, an air intake assembly is provided so that an air intake opening 330 of the air intake assembly faces the granulation chamber 300 . Therefore, the airflow passing through the air intake opening 330 can be divided into a first airflow 340 and a second airflow 350 .

[0181] Specifically, the first airflow 340 enters the granulation chamber 300. On the one hand, the first airflow 340 will impact the raw materials, so that the raw materials are dispersed into fine powders. On the other hand, the first airflow 340 will drive the raw materials to move in the granulation chamber 300, so that the raw materials impact the wall of the granulation chamber 300, or roll along the wall of the granulation chamber 300. Therefore, the raw materials are fully broken into fine powders, so that the size of the powders meets the production needs of lithium batteries.

[0182] Since the particle sizes of the raw materials are different, in the process of the first airflow 340 driving the powder to move, the first airflow 340 can also make the finer powder adhere to form a larger powder, so that the particle size of the powder tends to be consistent.

[0183] When the diameter of the powder is smaller than the diameter of the sieve hole 320 , the powder can pass through the sieve hole 320 into the separation chamber 310 , thereby completing the grading and screening of the powder.

[0184] The second airflow 350 flows in the separation chamber 310 and can take away the powder for easy collection, so that the present invention has both granulation and screening functions, and the equipment structure is optimized.

[0185] Compared with the prior art, the present invention uses airflow to complete granulation and screening, eliminating the shearing device and the rotation control device and the corresponding power, reducing energy consumption, and enabling the screening and granulation device to work with low energy consumption.

[0186] At the same time, since the airflow at the air inlet opening 330 generates the first airflow 340, the entity used to form the granulation chamber 300 of the present invention can be fixed, that is, the first cylinder 360 can be fixed, and the flipping power and flipping structure for flipping the entity used to form the granulation chamber 300 are omitted, that is, the flipping power and flipping structure for flipping the first cylinder 360 are omitted, which further reduces energy consumption and manufacturing costs, and facilitates the alignment of the air inlet opening 330 and the first cylinder 360, and facilitates the airflow at the air inlet opening 330 to enter the first cylinder 360 and form the first airflow 340.

[0187] In some embodiments, the airflow of the air inlet opening 330 may be cold air to meet the manufacturing requirements of temperature-sensitive materials.

[0188] In some embodiments, the air intake assembly may be connected to a cold air generating device to meet the need for using cold air.

[0189] In some embodiments, the airflow of the air inlet opening 330 can be hot air or protective gas to meet the production and manufacturing requirements of different materials.

[0190] In some embodiments, the air intake assembly may be provided with a heater to meet the need for using hot air.

[0191] In some embodiments, the air flow of the air inlet opening 330 may be arranged along the tangential direction of the first cylinder 360 and offset toward the center of the first cylinder 360 , so that the raw material can roll along the inner surface of the first cylinder 360 and form powder.

[0192] This embodiment optimizes the airflow direction and airflow position of the air inlet opening 330, and makes the flow direction of the first airflow 340 that has just entered the first cylinder 360 as tangent to the inner surface of the first cylinder 360 as possible, thereby reducing the impact of the first airflow 340 on the inner surface of the first cylinder 360, reducing the flow loss of the first airflow 340, and facilitating the first airflow 340 to flow along the inner surface of the first cylinder 360 to form a vortex, thereby facilitating the raw materials to rub against the inner surface of the first cylinder 360, which is conducive to efficient granulation. At the same time, it ensures that there is enough airflow to form the first airflow 340 to meet the needs of granulation.

[0193] In some embodiments, the airflow from the air inlet opening 330 can enter the granulation chamber 300 after passing through the sieve hole 320 , which not only meets the need to form the first airflow 340 , but also avoids increasing the difficulty of manufacturing and installing the first cylinder 360 .

[0194] In some embodiments, the air intake assembly may include an air intake nozzle 450 , which is located in the separation chamber 310 . The port of the air intake nozzle 450 is used to form the air intake opening 330 , and the port is disposed close to a body for forming the granulation chamber 300 .

[0195] In this embodiment, the air inlet nozzle 450 is arranged so that the air inlet nozzle 450 is close to the entity used to form the granulation chamber 300, and the air flow is made to flow into the granulation chamber 300 as much as possible after flowing out from the air inlet opening 330, thereby increasing the flow rate of the first air flow 340, which is beneficial to ensuring the granulation capacity of the screening granulation device.

[0196] In some embodiments, the port of the air inlet nozzle 450 may be configured to be tapered to increase the air flow velocity and facilitate the air flow to enter the granulation chamber 300 .

[0197] In some embodiments, the air intake assembly may include a plurality of air intake nozzles 450 to directly distribute the airflow of the air intake opening 330 , which may increase the manufacturing cost but is beneficial to the optimization of the first airflow 340 and the second airflow 350 .

[0198] For example, the air inlet nozzle 450 for forming the first airflow 340 can be placed as close as possible to the first cylinder 360 or directly connected to and introduced into the first cylinder 360, so that the first airflow 340 is sufficient. The center of the port of the air inlet nozzle 450 for forming the second airflow 350 is located at the geometric center of the cross section of the separation chamber 310. At the same time, the second airflow 350 enters the separation chamber 310 along the tangent direction of the separation chamber 310, and the direction of the second airflow 350 is less changed, thereby reducing the flow resistance.

[0199] In some embodiments, the first cylinder 360 can be disposed horizontally, the air inlet opening 330 is located at the bottom of the first cylinder 360 , and the airflow of the air inlet opening 330 flows upward.

[0200] In this embodiment, the air inlet opening 330 is arranged at the bottom of the first cylinder 360 so that the airflow of the air inlet opening 330 flows upward, and the raw materials deposited in the first cylinder 360 are blown up conveniently, thereby reducing the granulation blind area, so that all the raw materials in the first cylinder 360 are granulated, thereby improving the granulation efficiency.

[0201] In some embodiments, the cross section of the air inlet opening 330 may have a length direction, and the length direction of the cross section of the air inlet opening 330 is arranged along the axial direction of the first cylinder 360 .

[0202] In this embodiment, the cross-section of the air inlet opening 330 has a length direction, so that the area of ​​the air inlet opening 330 can be increased to increase the air intake flow rate and improve the production capacity. At the same time, the relative position of the air inlet opening 330 and the first cylinder 360 does not change, and the flow ratio of the first airflow 340 and the second airflow 350 changes little, thereby avoiding the first airflow 340 and the second airflow 350 affecting the screening and granulation efficiency.

[0203] In some embodiments, the shell assembly may include a collection shell 430 , which is connected to the second cylinder 420 . The interior of the collection shell 430 is used to form a collection cavity 440 . The collection cavity 440 is connected to the separation cavity 310 . The collection cavity 440 can be used to discharge the second airflow 350 .

[0204] In this embodiment, the collecting shell 430 is provided to collect the powder in the separation chamber 310 for easy production. Meanwhile, the collecting chamber 440 can be used for discharging the second airflow 350 , thus not affecting the flow of the second airflow 350 but also improving the efficiency of powder discharging.

[0205] In some embodiments, the collecting chamber 440 may be disposed at the bottom of the separation chamber 310 , and the collecting chamber 440 extends along the tangential direction of the second cylinder 420 and is offset toward the center of the second cylinder 420 .

[0206] In this embodiment, the collecting chamber 440 is disposed at the bottom of the separation chamber 310 , so that the gravity of the powder can be conveniently utilized so that the powder can settle into the collecting chamber 440 .

[0207] The collecting chamber 440 extends along the tangent direction of the second cylinder 420 and is offset toward the center of the second cylinder 420. Therefore, on the one hand, the falling powder can hit the inner surface of the second cylinder 420 and stall, and the powder can slide along the inner surface of the second cylinder 420 to the collecting chamber 440. On the other hand, when the powder flowing along the second airflow 350 passes through the collecting chamber 440, the combined force of centrifugal force and gravity causes the powder to fall into the collecting chamber 440, thereby improving the collection efficiency.

[0208] The collecting chamber 440 extends along the tangential direction of the second cylinder 420 and is offset toward the center of the second cylinder 420 , and also reserves sufficient space and time to facilitate the centrifugal force and gravity to exert force on the powder at the same time.

[0209] In this embodiment, the airflow of the air inlet opening 330 is arranged along the tangent of the first cylinder 360 and offset to the center of the first cylinder 360. It can be judged by the geometric center of the air inlet opening 330. There is no restriction on the edge of the air inlet opening 330. It is not excluded that the edge of the air inlet opening 330 is located outside the tangent of the first cylinder 360. The outside of the tangent of the first cylinder 360 refers to the direction away from the center of the first cylinder 360.

[0210] In this embodiment, the collecting cavity 440 extends along the tangent direction of the second cylinder 420 and is offset to the center of the second cylinder 420. In most cases, it can be judged by the geometric center of the collecting cavity 440. There is no restriction on the edge of the collecting cavity 440. It is not ruled out that the edge of the collecting cavity 440 is located outside the tangent of the second cylinder 420. The outside of the tangent of the second cylinder 420 refers to the direction away from the center of the second cylinder 420.

[0211] In the powder preparation part, the material needs to be transferred multiple times. In order to avoid affecting the quality of the powder, the raw materials should be transferred in a steady state. The raw material transfer in a steady state includes: compacting the raw materials before transferring, and / or transferring the raw materials in a gas-free or vacuum manner.

[0212] It is easy to understand that this embodiment uses a steady-state method to transport raw materials to maintain the state of the raw materials, avoids stirring the powder or causing the powder to flow freely during transportation, and helps reduce the segregation of the powder, helps to ensure the mixing effect, makes the powder consistent, and helps to improve the film-forming quality.

[0213] For example, after the powder is loaded into the material box, it is pressed tightly to prevent the powder particles from moving together and causing segregation.

[0214] For example, use pipeline transportation and set a screw in the pipeline to reduce the random flow of powder.

[0215] The film material preparation part mainly includes a metering extrusion step and a calendering film forming step.

[0216] For the metered extrusion step, one can use Figures 5 to 8 Metering extrusion film forming device.

[0217] See also Figures 5 and 6 The present application provides a metering extrusion structure 500, comprising a storage space 510, a discharge channel 520 and an extrusion space 530. The storage space 510 is used to store powder, the discharge channel 520 is connected to the storage space 510, and the discharge channel 520 has a discharge port 521 away from the storage space 510. The extrusion space 530 is arranged in the storage space 510, or at one end of the discharge channel 520 away from the discharge port 521, and the extrusion space 530 is used for the ultrasonic extrusion head 620 to extend into and extrude and compact the powder.

[0218] By setting the metering extrusion structure 500, the powder can be stored in the storage space 510, and the length H and width L of the discharge channel 520 can be controlled by the discharge channel 520, that is, the extrusion amount of the powder can be metered and controlled by controlling the length H and width L of the discharge channel 520. At the same time, by using the ultrasonic vibration extrusion effect of the ultrasonic extrusion head 620 in the extrusion space 530, the powder can be vibrated and compacted and extruded from the discharge port 521. After extrusion, the powder reaches the material receiving surface 610 (such as the surface of the pole piece, the surface of the transfer roller, etc.) and forms a film on the material receiving surface 610. By adjusting the length H of the discharge channel 520, the resistance of the powder in the discharge channel 520 can be adjusted. For example, when the length H is increased, the discharge resistance increases, and the film density can be increased at this time. When the length H is reduced, the discharge resistance decreases, so that the film density can be reduced. By adjusting the width L of the discharge channel 520, the discharge amount per unit length can be changed. For example, when the width L is increased, the discharge amount per unit length can be increased, thereby increasing the film density. When the width L is reduced, the discharge amount can be reduced, thereby reducing the film density. It can be seen that by controlling the length H and width L of the discharge channel 520 separately, the film density of the powder can be accurately adjusted so that the film density can meet the process requirements and improve the film quality of the pole piece powder in electrode manufacturing. It can be understood that the length H and width L of the discharge channel 520 can be adjusted separately or simultaneously to achieve accurate control of the film density.

[0219] It is understandable that, for the same metering extrusion structure 500, the length H and width L of the discharge channel 520 of the metering extrusion structure 500 may be fixed, and therefore, the discharge channel 520 with different lengths H or widths L may be obtained by selecting metering extrusion structures 500 of different specifications or selecting accessories of the discharge channel 520 of different specifications. Of course, in other examples, the metering extrusion structure 500 may adjust the width L by adjusting the spacing between the two side walls of the discharge channel 520, or adjust the length H by adjusting the distance between the inlet and outlet ends of the discharge channel 520, which means that the components inside the metering extrusion structure 500 may be set as movable parts, so as to adjust the length H and width L of the discharge channel 520 by moving the movable components, which is not limited here.

[0220] In some embodiments, the storage space 510 includes a feed channel 511, which is inclined relative to the discharge channel 520, and the feed channel 511 is connected to the discharge channel 520, and the extrusion space 530 is placed at the connection between the feed channel 511 and the discharge channel 520. By using the inclined feed channel 511, the powder can fall freely under the action of gravity and move smoothly to the position of the discharge channel 520, thereby realizing continuous feeding of the discharge channel 520. By setting the extrusion space 530 at the connection between the feed channel 511 and the discharge channel 520, the ultrasonic extrusion head 620 can vibrate and extrude the powder at the starting position of the discharge channel 520. When the powder is compacted and pushed toward the discharge port 521 under the action of vibration, the powder in the feed channel 511 can move under the action of gravity and be replenished in time to the discharge channel 520, thereby realizing continuous feeding of the discharge channel 520.

[0221] In some embodiments, the discharge channel 520 is vertically arranged, the storage space 510 includes at least two feed channels 511, the two feed channels 511 are symmetrically arranged about the discharge channel 520, and the extrusion space 530 is arranged at the connection of the two feed channels 511. By using the symmetrically arranged feed channels 511, on the one hand, it is possible to realize simultaneous feeding on both sides of the discharge channel 520, thereby improving the feeding efficiency of the discharge channel 520, and on the other hand, it is possible to ensure the uniformity of the feeding of the feed channels 511 on both sides, thereby ensuring that the discharge channel 520 can discharge smoothly. Of course, in other examples, more than two feed channels 511 may be arranged, such as three, four, etc., and multiple feed channels 511 may be symmetrically arranged about the discharge channel 520, or may be arranged at equal intervals around the discharge channel 520 in the circumferential direction, which is not limited here.

[0222] As an alternative embodiment, the feed channel 511 can be configured in the form of a conical drop, for example, Figure 6 The conical space formed by rotating the feed channel 511 around the axis of the discharge channel 520 is the storage space 510. The feed channel 511 is formed in the space, and the powder can be fed to the discharge channel along any direction of the conical space.

[0223] In some embodiments, a sidewall of the feed channel 511 away from the discharge channel 520 is provided with an avoidance notch 5111, the avoidance notch 5111 is connected to the extrusion space 530, and the avoidance notch 5111 is used for the ultrasonic extrusion head 620 to extend into the extrusion space 530. By providing the avoidance notch 5111, an avoidance space can be formed at the connection of the outer side walls of two adjacent feed channels 511, and the avoidance space can avoid mutual interference between the outer walls of the two feed channels 511, and can expose the extrusion space 530, so as to facilitate the insertion of the ultrasonic probe.

[0224] In some embodiments, the discharge port 521 is extended along the width direction of the pole piece. By setting the discharge port 521 to extend along the width direction of the pole piece, the pole piece moves along its own length direction while the discharge port 521 discharges the material, and the powder coating film forming process on the surface of the pole piece can be completed at one time, thereby improving the efficiency of the powder coating.

[0225] Of course, in other embodiments, the opening size of the discharge port 521 can be smaller than the width of the electrode piece. The electrode piece can achieve a powder coating effect by multiple coatings or by using multiple groups of metering extrusion structures 500 for discharging in parallel. The metering extrusion structure 500 can also discharge the material while moving back and forth relative to the electrode piece along the width direction of the electrode piece, so that the electrode piece is fully coated with powder along the width direction.

[0226] See also Figure 6 and Figure 7 The present application also provides a metering extrusion film-forming device 600, including a material receiving surface 610 and a metering extrusion structure 500 provided in the first aspect, wherein the material receiving surface 610 is arranged at the discharge port 521, and there is a gap M between the material receiving surface 610 and the discharge port 521. Since there is a gap M between the material receiving surface 610 and the discharge port 521, the powder can reach the material receiving surface 610 after being extruded from the discharge port 521 and form a film on the material receiving surface 610. At this time, the film thickness of the powder is the gap M. Therefore, by controlling the gap M between the material receiving surface 610 and the discharge port 521, accurate control of the film thickness can be achieved. It can be seen that the three parameters of the length H, width L and gap M of the discharge channel 520 can be used to meter and control the film density and film thickness of the powder to meet the process requirements. In this way, the powder can meet the production requirements of the pole piece after one extrusion film formation, and there is no need for secondary rolling thinning, which helps to improve manufacturing efficiency.

[0227] In some embodiments, the metering extrusion film-forming device 600 also includes an ultrasonic extrusion head 620, which is disposed in the extrusion space 530. By utilizing the ultrasonic vibration of the ultrasonic extrusion head 620, the powder can be vibrated and compacted through the extrusion space 530 and pushed out of the discharge channel 520. Optionally, the powder refers to mixed active substances, conductive agents, solid binders and other substances, which are mixed in powder form to form a uniform and stable powder. The operating frequency of the ultrasonic extrusion head 620 can be 15KHz~20KHz, such as 15KHz, 16KHz, 18KHz, 20KHz, etc. The energy generated by ultrasonic vibration can be used to compact the powder and improve the density of the powder, thereby achieving the effect of powder film formation.

[0228] Optionally, see Figure 8The ultrasonic extrusion head 620 can also be installed by using a fixing bracket 623, and the ultrasonic transducer 621 and the ultrasonic horn 622 can be connected in sequence, and the ultrasonic extrusion head 620 can be driven by using the ultrasonic transducer 621 and the ultrasonic horn 622. The fixing bracket 623 can fix the ultrasonic horn 622, so as to adjust the gap between the ultrasonic extrusion head 620 and the extrusion metering structure.

[0229] It can be understood that the receiving surface 610 refers to the surface for receiving the powder, which can be a plane or a curved surface. The receiving surface 610 can be the surface of the pole piece, that is, the powder can be directly extruded from the discharge channel 520 onto the pole piece to complete the coating of the powder. Or in other examples, the powder does not fall directly on the surface of the pole piece, but first forms a film on the surface of the transfer roller (not shown), and then the film formed by the powder is transferred to the pole piece by the transfer roller, which is not limited here. The following describes two embodiments in which the receiving surface 610 is the pole piece surface or the transfer roller surface.

[0230] In some embodiments, the metering extrusion film forming device 600 also includes a support roller 630 spaced apart from the discharge port 521, the support roller 630 is rotatable relative to the discharge port 521, the surface of the support roller 630 facing the discharge port 521 is used to wind the pole piece, and the surface of the pole piece facing the discharge port 521 forms a material receiving surface 610. By providing the support roller 630, the pole piece receiving the powder can be supported to avoid the fluctuation of the size of the gap M caused by the shaking of the pole piece when the powder is coated, and to avoid the problem of uneven film thickness. Therefore, providing the material receiving surface 610 on the support roller 630 can improve the stability and reliability of the powder extrusion film forming process, make the film thickness more uniform, and improve the effect of pole piece manufacturing.

[0231] Optionally, the support roller 630 can be made of alloy steel material, so that the support roller 630 has sufficient strength and rigidity to provide good support for the pole piece. The roughness of the surface of the support roller 630 can be set to Ra12.5~6.3, so that when the pole piece is wound on the surface of the support roller 630, there can be good friction between the two, so that the support roller 630 can provide sufficient tension to the pole piece, so that the surface of the pole piece can be kept flat, ensuring that the powder extruded into a film can be evenly coated on the surface of the pole piece.

[0232] In some embodiments, the support roller 630 is provided with a temperature-variable structure, and the temperature-variable structure is used to heat or cool the support roller 630. According to the film-forming temperature requirement, the temperature of the support roller 630 can be selectively changed, such as heating or cooling the support roller 630, to meet the process requirements of temperature control during the film-forming process. For example, for the binder particles mixed in the pole piece powder, the binder particles will usually be denatured in a high temperature environment and become sticky. Therefore, by heating the support roller 630, the pole piece powder can be made sticky during the process of being extruded to the receiving surface 610 for film formation, thereby meeting the process requirements. Or in other examples, if it is necessary to avoid the stickiness of the binder particles during the extrusion of the pole piece powder into the film, the support roller 630 is cooled to avoid the stickiness of the pole piece powder too early.

[0233] In some embodiments, a heat exchange channel 631 is provided in the support roller 630, and the heat exchange channel 631 is used to pass a heat exchange medium. By setting the heat exchange channel 631, different heat exchange media can be selectively passed, so as to achieve the heating or cooling effect of the support roller 630. For example, passing a hot medium (such as heat transfer oil) into the heat exchange channel 631 can increase the temperature of the support roller 630, and passing a cold medium (such as coolant) into the heat exchange channel 631 can reduce the temperature of the support roller 630. Optionally, the heat exchange channel 631 can be extended along the axial direction of the support roller 630 and pass through the two end surfaces of the support roller 630. Of course, in other embodiments, the support roller 630 can be heated not by a heat exchange medium, but by an electric heating tube or an electromagnetic coil.

[0234] In some embodiments, the metering extrusion film-forming device 600 also includes a transfer roller spaced apart from the discharge port 521, the transfer roller is rotatable relative to the discharge port 521, and the surface of the transfer roller facing the discharge port 521 forms a material receiving surface 610, and the transfer roller is used to transfer the extruded powder to the surface of the electrode. Utilizing the transfer effect of the transfer roller, when the powder is extruded from the discharge channel 520, it can first form a film on the surface of the transfer roller, and then when the transfer roller rotates to contact the electrode, the powder formed on the surface of the transfer roller can be transferred to the surface of the electrode, so as to achieve the effect of coating the surface of the electrode with powder. By setting the transfer roller, it is possible to avoid the fluctuation of the size of the gap M caused by the direct shaking of the electrode when coating the powder, and avoid the problem of uneven film thickness. Therefore, setting the material receiving surface 610 on the transfer roller can improve the stability and reliability of the powder extrusion film-forming process, make the film thickness more uniform, and improve the effect of electrode manufacturing.

[0235] Of course, as an alternative embodiment, the material connection surface 610 can also be directly set on the pole piece, and the pole piece is set corresponding to the discharge port 521. Tensioning rollers can be provided at both ends of the pole piece for tensioning, so that the surface of the pole piece has a certain tension, and the amplitude of the pole piece jitter is reduced during the process of extruding the pole piece powder from the discharge channel 520, so that the process of extruding the pole piece powder into a film is more stable. Or, as another alternative embodiment, the material connection surface 610 can be directly set on the pole piece, and the pole piece is supported by structures such as a conveyor belt and a conveyor support block. In this case, the material connection surface 610 can be a plane. This can also meet the requirements of pole piece stability and achieve the effect of pole piece movement during the extrusion of pole piece powder, which is not limited in this example.

[0236] In some specific embodiments of the present invention, the powder material on the receiving surface can be calendered, including: using at least one pair of calendering rollers to extrude the powder material on the receiving surface, and the roller surface speeds of the pair of calendering rollers are set differently. Since the shape of the rollers is easy to understand, it is not shown in the figure.

[0237] It is easy to understand that in this embodiment, calendering rollers are set so that the roller surface speeds of the calendering rollers are different. Therefore, the calendering rollers all rotate. On the one hand, the calendering rollers can extrude the powder, change the thickness of the powder, and reduce the thickness difference of the powder. On the other hand, the powder can pass through the calendering rollers smoothly and be calendered into a continuously extended film to meet the requirements of composite with foil.

[0238] The speed difference of the calendering rollers causes displacement on both sides of the powder, which can shear the powder with high intensity, generate heat and melt inside the powder, make the fiberization more uniform, further improve the film strength, and facilitate the production of film materials.

[0239] For the calendering film-forming step, a high temperature environment can be used to further improve the film-forming quality.

[0240] As for the transfer and lamination part, the transfer and lamination part rolls and laminates the film material and the foil material, and the transfer and lamination part can transfer heat between the film material and the foil material.

[0241] It is easy to understand that in this embodiment, the material receiving surface is made the roller surface, so that the film material is not formed directly on the foil material. Instead, after the film material is formed, the film material and the foil material are compounded to produce the required electrode film, so as to produce the electrode sheet, avoid the calendering effect of the calendering film on the foil material, and reduce the risk of damage to the foil material.

[0242] For transfer lamination, the rollers can be heated or cooled to meet the transfer lamination needs.

[0243] In the second aspect, the present application also provides a lithium battery pole piece dry manufacturing equipment assembly (hereinafter referred to as the equipment assembly), which is used to implement the lithium battery pole piece dry manufacturing process (hereinafter referred to as the manufacturing process) provided in the first aspect. The equipment assembly includes a powder material preparation device and a film material preparation device. The powder material preparation device is used to implement the powder material preparation part, and the film material preparation device is used to implement the film material preparation part.

[0244] It can be understood that, since the equipment assembly includes the manufacturing process described in the first aspect above, the equipment assembly has the beneficial effects of the manufacturing process described in the first aspect above, which will not be repeated here.

[0245] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0246] The terms "first, second, third, fourth", etc. (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that shown or described herein.

[0247] It should also be noted that in the description of this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0248] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may also include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0249] Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0250] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A dry manufacturing process for lithium battery pole pieces, characterized in that: include: In the powder preparation part, the raw materials are mixed, kneaded and fiberized to form powder; In the film material preparation part, the powder is extruded from the discharge channel to the receiving surface, a metering gap is formed between the discharge channel and the receiving surface, and the receiving surface can move relative to the discharge channel so that the powder is spread to the receiving surface, and the powder on the receiving surface is calendered to turn the powder into film material.

2. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: The discharge channel has a length dimension and a width dimension, at least one of which can be adjusted to adjust extrusion parameters, and / or the distance between the discharge channel and the material receiving surface can be adjusted.

3. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: The extruding of the powder from the discharge channel to the receiving surface comprises: extruding the powder from the discharge channel to the receiving surface by vibration, and / or, the feed side of the discharge channel is connected to a feed channel, the feed channel and the discharge channel are arranged at an angle, an extrusion space is arranged between the feed channel and the discharge channel, the extrusion space accommodates an extrusion head, and the extrusion head extrude the powder in the feed channel to the discharge channel.

4. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: Calendering the powder material on the receiving surface includes: using at least one pair of calendering rollers to extrude the powder material on the receiving surface, and the roller surface speeds of the pair of calendering rollers are set differently.

5. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: The material receiving surface is a roller surface, and the dry manufacturing process further includes a transfer compounding part, which rolls and compounds the film material and the foil material, and the transfer compounding part can transfer heat between the film material and the foil material.

6. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: In the powder preparation part, before mixing the raw materials, the incoming materials are screened to obtain raw materials with uniform particle sizes, and the raw materials with uniform particle sizes are used for mixing; The screening of the incoming material includes: making the incoming material flow with the airflow, making the particles of the incoming material collide with each other to break or adhere, and then separating the particles by centrifugal force, and / or screening the particles through the sieve holes.

7. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: In the powder preparation part, the mixing of raw materials includes: pneumatic mixing and / or vacuum low-pressure mixing. The pneumatic mixing includes: mixing on a fluidized bed by pneumatic boiling and homogenization spreading; the vacuum low-pressure mixing includes gravity mixing without stirring in the form of vacuum or low pressure and letting it stand.

8. A dry manufacturing process for lithium battery pole pieces according to claim 1, characterized in that: In the powder preparation part, after kneading and fiberization, the fiberized raw materials are granulated and sieved.

9. A dry manufacturing process for lithium battery pole pieces according to claim 8, characterized in that: The granulation and screening of the fiberized raw material includes: generating a vortex granulation airflow in a first cylinder so that the fiberized raw material flows with the vortex granulation airflow for granulation, the first cylinder is provided with sieve holes, and the particles generated by granulation enter the second cylinder through the sieve holes, the second cylinder is mounted outside the first cylinder, and a vortex separation airflow is formed between the first cylinder and the second cylinder, and the vortex separation airflow takes away the particles passing through the sieve holes for collection to form the required powder.

10. A dry manufacturing process for lithium battery pole pieces according to any one of claims 1 to 9, characterized in that: In the powder preparation part, the raw material is transferred in a steady state, and the raw material transfer in a steady state includes: compacting the raw material and then transferring it, and / or transferring the raw material in a gas-less or vacuum manner.

11. A lithium battery pole piece dry manufacturing equipment assembly, characterized in that: The lithium battery pole piece dry manufacturing equipment assembly is used to implement the lithium battery pole piece dry manufacturing process according to any one of claims 1 to 10, and the lithium battery pole piece dry manufacturing equipment assembly comprises: A powder material preparation device, the powder material preparation device is used to implement the powder material preparation part; A film material preparation device is used to implement the film material preparation part.

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