Battery powder preparation system and battery production line

Abstract

The utility model discloses a battery powder preparation system and a battery production line, and relates to the technical field of battery production, the battery powder preparation system comprises a drying tower, a high-pressure dispersion machine, a hot air module and a material receiving module, the drying tower is provided with a drying cavity, and a first feed port and a first discharge port which are communicated with the drying cavity; the high-pressure dispersion machine is communicated with the first feeding hole, and the high-pressure dispersion machine is arranged to be used for crushing slurry into nano particles and feeding the nano particles to the first feeding hole; the hot air module communicates with the first feeding port and is arranged to blow hot air into the first feeding port; the material collecting module communicates with the first discharging opening, and the material collecting module is arranged to be used for collecting powder. According to the technical scheme, nanocrystallization processing of the battery powder can be achieved, and the battery performance is improved.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a battery powder preparation system and a battery production line. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the process of lithium battery preparation, lithium-ion battery powder needs to be prepared. The particle morphology and size of the battery powder will affect the electrochemical reaction rate during the charging and discharging process of the lithium battery. If the powder particle size is too large, the charging and discharging efficiency of the lithium battery will be reduced, and dendrites and short circuits will easily occur, affecting the performance of the lithium battery. Utility Model Content

[0004] The main purpose of this application is to propose a battery powder preparation system and a battery production line, aiming to achieve nano-processing of battery powder and improve battery performance.

[0005] To achieve the above objectives, the battery powder preparation system proposed in this application includes:

[0006] A drying tower, the drying tower being provided with a drying chamber, a first feed port and a first discharge port communicating with the drying chamber;

[0007] a high-pressure disperser, the high-pressure disperser being in communication with the first feed port, the high-pressure disperser being configured to crush the slurry into nanoparticles and feed the nanoparticles to the first feed port;

[0008] a hot air module, the hot air module being in communication with the first feed port and configured to blow hot air into the first feed port; and

[0009] A material receiving module is connected to the first discharge port and is configured to collect powder.

[0010] In the embodiment of the present application, a high-pressure disperser is used to perform nano-dispersion treatment on the slurry to form nano-particles which are sprayed into a drying tower, and a hot air module blows hot air into the drying tower at the same time, so that the nano-slurry particles and the hot air are parallel to be dried to form nano-powder particles, and the nano-powder particles can be discharged from the first discharge port with the air flow so that the nano-powder particles are collected by the receiving module, thereby completing the nano-preparation of the battery powder, so that the obtained powder has a narrow particle size distribution, good particle sphericity, and a uniform specific surface. The powder is applied to the battery, which is beneficial to shortening the diffusion distance of lithium ions and accelerating the electrochemical reaction rate during the charge and discharge process. A larger specific surface area provides more active sites, enhances the contact between the electrode material and the electrolyte, thereby improving the lithium ion insertion / extraction efficiency, achieving higher capacity and fast charge and discharge capabilities, making the lithium ion flow uniform, reducing dendrite formation, reducing the risk of short circuit, and thus improving battery performance.

[0011] In one embodiment, the high pressure disperser comprises:

[0012] A valve seat is provided with a slurry channel, and a slurry inlet and a slurry outlet communicated with the slurry channel and respectively located at two ends of the slurry channel;

[0013] A homogenizing valve, the homogenizing valve being arranged opposite to the slurry discharge port, and the homogenizing valve being spaced apart from the valve seat to form a first material passing slit;

[0014] a collision ring, the collision ring being disposed around the outside of the first material passing slit; and

[0015] A pump body is configured to inject slurry from the slurry inlet into the slurry channel.

[0016] This setup employs a high-pressure disperser with a collision valve body in a battery powder preparation system. When the high-pressure disperser is in operation, slurry is pumped into the slurry channel by a pump body and rapidly flows toward the discharge port, causing the slurry to collide with the homogenizing valve and collision ring at a high speed. This impact force effectively breaks up the droplets. Furthermore, as the slurry passes through the slit between the homogenizing valve and the valve seat at high speed, the droplets in the slurry are first extended and then sheared and broken apart by turbulence. Simultaneously, the slurry experiences a significant pressure drop, causing some of the droplets in the slurry to rapidly vaporize and generate numerous bubbles. As the slurry is discharged from the first slit, the pressure rises, causing the bubbles to collapse, forming a large number of cavitations. The collapse of the cavitations releases enormous energy, generating high-frequency vibrations that further promote slurry fragmentation. In other words, the slurry undergoes nano-processing in the high-pressure disperser under the combined effects of the collision, shear, and cavitation effects, forming nano-sized slurry particles that are evenly dispersed.

[0017] In one embodiment, the homogenizing valve can be moved closer to or farther from the valve seat to adjust the width of the first material passing slit.

[0018] This setting can adjust the particle size of the slurry after crushing by controlling the width of the first feed slit, and can also control the pressure in the slurry channel and the pump body, thereby controlling the pressure applied to the slurry to meet the preparation requirements of different powder particle sizes.

[0019] In one embodiment, the battery powder preparation system further includes:

[0020] a feeding pipe, wherein both ends of the feeding pipe are respectively connected to the high-pressure disperser and the first feeding port; and

[0021] An ultrasonic generator is connected to the feeding tube and is configured to radiate ultrasonic waves into the feeding tube.

[0022] In the above method, the slurry crushed by the high-pressure disperser is transported to the drying tower through the feeding pipe. During the process of transporting the slurry to the drying tower, the slurry particles are subjected to ultrasonic action, so that the slurry particles remain in a uniformly dispersed state, reducing the agglomeration of particles and ensuring the particle size of the final prepared powder.

[0023] In one embodiment, the battery powder preparation system further includes an air supply module, which is connected to the first feed port and is configured to blow gas into the first feed port.

[0024] With this arrangement, while the high-pressure disperser sprays the high-pressure dispersed slurry into the drying tower and the hot air module blows hot air into the drying tower, the air supply module can be used to blow high-pressure gas into the drying tower. The slurry can be sprayed into the drying tower simultaneously with the hot air and high-pressure gas. Under the action of the hot air and high-pressure gas, the nano-sized particles are kept in the drying tower and dried to form nano-powder particles, which can reduce or avoid the occurrence of particle agglomeration.

[0025] In one embodiment, the hot air module includes:

[0026] a first hot air pipeline, the first hot air pipeline being in communication with the first feed port; and

[0027] A first heat exchanger is provided in the first hot air pipeline, and the first heat exchanger is configured to exchange heat with the first hot air pipeline to increase the temperature of the airflow in the first hot air pipeline.

[0028] By adopting the above method, since the gas in the first hot air pipeline does not directly contact the open flame, the explosion phenomenon can be avoided when the battery powder preparation system is used to prepare explosive powder.

[0029] In one embodiment, the hot air module further includes:

[0030] a second hot air pipeline, the second hot air pipeline passing through the first heat exchanger; and

[0031] A burner is provided in the second hot air pipeline and is used to heat the air flow in the second hot air pipeline.

[0032] The above method is adopted, that is, the hot air heated by the burner is used to heat the first heat exchanger, thereby transferring heat to the air flow in the first hot air pipeline through the first heat exchanger to increase the temperature of the air flow in the first hot air pipeline; in this way, the first heat exchanger continuously absorbs heat, ensuring that the air flow in the first hot air pipeline can absorb sufficient heat and increase the temperature, thereby ensuring the powder drying effect.

[0033] In one embodiment, the first hot air pipeline is provided with a first communication position downstream of the first heat exchanger, and the second hot air pipeline is provided with a second communication position between the burner and the first heat exchanger;

[0034] The hot air module also includes:

[0035] a third hot air pipeline, wherein both ends of the third hot air pipeline are respectively connected to the first communication position and the second communication position;

[0036] a first control valve, the first control valve being provided in the third hot air pipeline; and

[0037] A second control valve is provided in the second hot air pipeline and is located downstream of the second communication position.

[0038] By adopting the above method, the airflow in the first hot air pipeline or the second hot air pipeline can be selected according to the use requirements to enter the drying tower for drying the powder. For example, in the working condition of using the battery powder preparation system to prepare powder with the risk of combustion and explosion, the first hot air pipeline is used to supply hot air to the drying tower to reduce the risk of combustion and explosion. At this time, the first control valve is in a state that makes the third hot air pipeline non-conductive, and the second control valve is in a state that makes the second hot air pipeline conductive. The hot air blown out of the second hot air pipeline will not be supplied to the drying tower through the third hot air pipeline, but will be blown to the first heat exchanger for heating the airflow in the first hot air pipeline. In the working condition of using the battery powder preparation system to prepare powder that does not cause combustion and explosion problems, the hot air in either the first hot air pipeline or the second hot air pipeline can be selected to flow into the drying tower. When the hot air in the second hot air pipeline is blown to the drying tower through the third hot air pipeline, the heating efficiency is high because the burner is used to heat the airflow, which reduces heat energy loss.

[0039] In one embodiment, the hot air module further includes a first filter, which is disposed at the air flow inlet of the hot air module.

[0040] This setting can filter the airflow entering the hot air module to remove foreign matter such as dust in the airflow, prevent impurities in the airflow from mixing into the prepared powder, and thus improve the purity of the prepared powder.

[0041] In one embodiment, the receiving module includes:

[0042] A gas-solid separation structure, wherein the gas-solid separation structure is provided with a gas-solid separation chamber, a second feed port communicating with the gas-solid separation chamber, a second discharge port, and an exhaust port, wherein the second feed port is communicated with the first discharge port;

[0043] A powder collecting tank is provided with a powder collecting cavity and a third feed port communicating with the powder collecting cavity, wherein the third feed port is communicated with the second discharge port.

[0044] In the above method, after the powder is discharged from the drying tower with the air flow, it first enters the gas-solid separation structure to separate the powder from the air flow. The air flow is discharged from the exhaust port, and the powder is discharged from the second discharge port to be transported to the powder collection tank for powder recovery.

[0045] In one embodiment, the hot air module is provided with a second heat exchanger, and the second heat exchanger is configured to heat the airflow in the hot air module;

[0046] The receiving module further includes an exhaust pipe, which is communicated with the exhaust port and passes through the second heat exchanger so that the second heat exchanger absorbs heat from the airflow in the exhaust pipe.

[0047] Using the above method, the exhaust gas discharged from the receiving module will flow through the second heat exchanger in the hot air module, so that the heat carried by the exhaust gas will be absorbed by the second heat exchanger, and this part of the heat will be used to heat the airflow in the hot air module, thereby realizing heat recovery and utilization, improving energy utilization efficiency and reducing energy loss.

[0048] In one embodiment, a third discharge port communicating with the powder collecting chamber is provided at the bottom of the powder collecting tank, and the collecting module further comprises a grinder, which is provided at the third discharge port.

[0049] With such an arrangement, the powder collected in the powder collecting tank can be crushed and deagglomerated by the crusher, thereby deagglomerated the agglomerated powder and ensuring the particle size of the powder.

[0050] In one embodiment, the material receiving module further includes a powder material processing module, which is disposed downstream of the powder material collecting tank. The powder material processing module includes at least one of a vibrating screen and a first iron remover.

[0051] This setting method can use the powder processing module to process the collected powder, wherein the vibrating screen can be used to screen the powder to remove powder particles that do not meet the particle size requirements and ensure the yield of powder preparation; the first iron remover can be used to remove ferromagnetic impurities mixed in the powder and improve the purity of the powder.

[0052] In one embodiment, the material receiving module includes at least two groups of powder processing modules, the feed ends of the at least two groups of powder processing modules are respectively connected to the third discharge port of the powder collection tank, and the powder processing module includes at least one of a vibrating screen and a first iron remover.

[0053] This configuration allows the collected powder to be processed using the powder processing module. A vibrating screen can be used to screen the powder to remove particles that do not meet the particle size requirements, ensuring the yield of powder preparation. A first iron remover can be used to remove ferromagnetic impurities from the powder, improving its purity. By providing at least two sets of powder collection modules, if one set of powder processing modules fails or requires cleaning or maintenance, the other powder processing module in the collection module can perform screening and / or ferromagnetic impurity removal operations on the powder.

[0054] In one embodiment, the powder collecting tank is provided with a gas outlet communicated with the powder collecting chamber, and the material collecting module further comprises a vacuum pump, which is communicated with the gas outlet.

[0055] In this setting, during the powder collection process, the vacuum pump evacuates the powder collection chamber to form a negative pressure environment in the powder collection chamber, thereby giving the powder the power to move from the gas-solid separator to the powder collection tank, allowing the powder to be smoothly transferred into the powder collection chamber.

[0056] In one embodiment, the material collecting module further includes a vibrator, which is disposed on an outer wall of the powder collecting tank. The vibrator is configured to provide a vibration force to the powder collecting tank to shake off the powder.

[0057] Using the above method, the vibrator can provide impact force to the powder collection tank to shake off the powder, prevent the powder from adhering to the cavity wall in the powder collection chamber, blocking the third discharge port, and forming bridges, thereby ensuring that the powder is discharged smoothly from the powder collection tank.

[0058] In one embodiment, the gas-solid separation structure is configured as a bag-type receiver.

[0059] With this arrangement, the bag-type receiver has high powder recovery efficiency, can reduce the loss of powder recovery, and is convenient for powder recovery.

[0060] In one embodiment, the gas-solid separation structure further includes a star-shaped discharge valve, which is provided at the second discharge port, and a valve cavity of the star-shaped discharge valve is connected to the third feed port.

[0061] This setting utilizes the rotating impeller in the star-shaped discharge valve to transport powder. The star-shaped discharge valve can prevent the gas-solid separation structure from being directly connected to the powder collection tank, thereby playing a sealing role, preventing the vacuum or negative pressure state in the powder collection chamber from being destroyed, and also reducing the airflow in the gas-solid separation structure from entering the powder collection chamber.

[0062] In one embodiment, the first discharge port is located at the bottom of the drying tower, and the battery powder preparation system further includes a connecting pipe, the connecting pipe including a first section and a second section, one end of the first section is connected to the first discharge port and extends downward from the first discharge port, the second section extends upward from the first section, and the end of the second section away from the first section is connected to the material receiving module.

[0063] This arrangement allows powder particles to be discharged smoothly from the first discharge port at the bottom of the drying tower, preventing accumulation of powder in the drying chamber. The discharged powder is then transported along a connecting pipe to the receiving mechanism. The curved connecting pipe eliminates the need to locate the receiving module below the drying tower, facilitating the layout of the battery powder preparation system.

[0064] In one embodiment, the connection position between the first section and the second section is configured as an arc structure; with this configuration, the airflow and powder flow in the connecting pipe more smoothly, which is beneficial to reducing flow resistance and the risk of powder clogging the connecting pipe.

[0065] In one embodiment, a drain outlet is provided at the connection position of the first section and the second section, and the battery powder preparation system further includes a drain valve, which is provided at the drain outlet and is configured to control the connectivity between the drain outlet and the external environment.

[0066] With this arrangement, when the drying tower needs to be cleaned, the drain valve can be opened to connect the drain port to the outside environment. Dirt and cleaning liquid in the drying tower and the connecting pipe can be discharged to the outside through the drain port, making cleaning easier.

[0067] In one embodiment, the battery powder preparation system further includes a feed pipe, which is connected to the slurry inlet of the high-pressure disperser;

[0068] Wherein, the battery powder preparation system further includes a slurry tank, which is connected to the slurry inlet of the feed pipe and is configured to store slurry.

[0069] This setting method can store sufficient slurry in the slurry tank to continuously supply slurry to the high-pressure disperser, eliminating the need for manual multiple refills and improving ease of use.

[0070] In one embodiment, the battery powder preparation system further includes a slurry processing module, which is arranged between the slurry inlet of the feed pipe and the high-pressure disperser, and the slurry processing module includes at least one of a slurry filter and a second iron remover.

[0071] Among them, by setting up a slurry processing module, the slurry sent to the high-pressure disperser can be pre-treated, wherein the slurry filter can filter the slurry to remove or reduce impurities in the slurry and improve the purity of the prepared powder; the second iron remover can remove ferromagnetic impurities mixed in the slurry, thereby improving the purity of the prepared powder.

[0072] In one embodiment, the battery powder preparation system further includes a water storage tank, which is connected to the cleaning liquid inlet of the feeding pipe and is configured to store the cleaning liquid.

[0073] With this arrangement, when it is necessary to clean structures such as the high-pressure disperser, drying tower, and feed pipe, the injection of slurry into the battery powder preparation system can be suspended, and the cleaning liquid in the water storage tank can be fed into the high-pressure disperser and drying tower through the feed pipe. The cleaning liquid is used to clean each structure, thereby improving the convenience of cleaning the battery powder preparation system.

[0074] The present application also proposes a battery production line, which includes a battery powder preparation system as described in any of the aforementioned embodiments.

[0075] In a battery production line, the battery powder preparation system described in the aforementioned embodiment is used to prepare battery powder, resulting in a narrow particle size distribution, good particle sphericity, and uniform specific surface area. This helps shorten the diffusion distance of lithium ions in the final battery and accelerates the electrochemical reaction rate during the charge and discharge process. The larger specific surface area provides more active sites, enhancing the contact between the electrode material and the electrolyte, thereby improving the efficiency of lithium ion insertion and extraction, achieving higher capacity and rapid charge and discharge capabilities, making the lithium ion flow uniform, reducing dendrite formation, and reducing the risk of short circuits.

[0076] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0078] Figure 1 This is a structural diagram of an embodiment of a battery powder preparation system provided in this application;

[0079] Figure 2 This is a structural schematic diagram of an embodiment of a high-pressure disperser in the battery powder preparation system provided in this application.

[0080] Description of Figure Numbers:

[0081] 100. Battery powder preparation system; 10. Drying tower; 11. Drying chamber; 12. First feed port; 13. First discharge port; 14. Connecting pipe; 141. First section; 142. Second section; 15. Drain valve; 16. Feed pipe;

[0082] 20. High-pressure disperser; 21. Valve seat; 211. Slurry channel; 212. Slurry inlet; 213. Slurry outlet; 22. Homogenizing valve; 23. Collision ring; 24. First feed slit; 25. Second feed slit;

[0083] 30. Hot air module; 31. First hot air pipeline; 311. First connection point; 32. First heat exchanger; 33. Second hot air pipeline; 331. Second connection point; 34. Burner; 35. Third hot air pipeline; 36. First control valve; 37. Second control valve; 38. Second heat exchanger; 39. First filter;

[0084] 40. Material collection module; 41. Gas-solid separation structure; 411. Second feed port; 412. Second discharge port; 413. Exhaust port; 42. Powder collection tank; 421. Third feed port; 422. Third discharge port; 423. Gas outlet; 43. Pulverizer; 44. Powder processing module; 441. Vibrating screen; 442. First iron remover; 45. Vacuum pump; 46. Vibrator; 47. Exhaust pipe; 48. Fan; 49. Star-shaped discharge valve;

[0085] 50. Air supply module; 51. Air supply pipeline; 52. Air booster; 53. Second filter;

[0086] 60. Feed pipe; 61. Slurry inlet; 62. Cleaning liquid inlet; 70. Slurry tank; 80. Slurry processing module; 90. Water storage tank.

[0087] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0088] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application 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 embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0096] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0097] The preparation of lithium-ion battery powders is necessary in the lithium-ion battery manufacturing process. The particle morphology and size of the battery powders affect the electrochemical reaction rate during the lithium-ion battery's charge and discharge process. If the powder particle size is too large, the lithium-ion battery's charge and discharge efficiency will decrease, and dendrites and short circuits will easily occur, affecting the performance of the lithium-ion battery. Battery powders are usually electrode materials, such as positive and negative electrode materials.

[0098] Based on the above considerations, the present application proposes a battery powder preparation system, which includes a drying tower, a high-pressure disperser, a hot air module and a receiving module. The drying tower is provided with a drying chamber, a first feed port and a first discharge port connected to the drying chamber; the high-pressure disperser is connected to the first feed port, and the high-pressure disperser is configured to crush the slurry into nano-particles and send them to the first feed port; the hot air module is connected to the first feed port, and the hot air module is configured to blow hot air into the first feed port; the receiving module is connected to the first discharge port, and the receiving module is configured to collect powder.

[0099] In the process of preparing battery powder using the above-mentioned battery powder preparation system, a high-pressure disperser is used to perform nano-dispersion treatment on the slurry to form nano-particles which are sprayed into a drying tower. At the same time, a hot air module blows hot air into the drying tower so that the nano-slurry particles are dried in parallel with the hot air to form nano-powder particles. The nano-powder particles can be discharged from the first discharge port with the air flow so that the nano-powder particles are collected by the collecting module, thereby completing the nano-preparation of the battery powder, so that the obtained powder has a narrow particle size distribution, good particle sphericity, and uniform specific surface area. The powder is applied to batteries, which is beneficial to shortening the diffusion distance of lithium ions and accelerating the electrochemical reaction rate during the charge and discharge process. A larger specific surface area provides more active sites, enhances the contact between the electrode material and the electrolyte, thereby improving the lithium ion insertion / extraction efficiency, achieving higher capacity and fast charge and discharge capabilities, making the lithium ion flow uniform, reducing dendrite formation, reducing the risk of short circuits, and thus improving battery performance.

[0100] See also Figure 1 and Figure 2 , Figure 1 Schematic diagram of the structure of a battery powder preparation system 100 provided according to some embodiments of the present application. Figure 2 This is a schematic diagram of the partial structure of the high-pressure disperser 20 provided in some embodiments of the present application.

[0101] According to some embodiments of the present application, the battery powder preparation system 100 includes a drying tower 10, a high-pressure disperser 20, a hot air module 30 and a receiving module 40. The drying tower 10 is provided with a drying chamber 11, a first feed port 12 and a first discharge port 13 connected to the drying chamber 11; the high-pressure disperser 20 is connected to the first feed port 12, and the high-pressure disperser 20 is configured to crush the slurry into nano-particles and send them to the first feed port 12; the hot air module 30 is connected to the first feed port 12, and the hot air module 30 is configured to blow hot air into the first feed port 12; the receiving module 40 is connected to the first discharge port 13, and the receiving module 40 is configured to collect powder.

[0102] The slurry refers to a mixture of the powder to be prepared and a solvent. The mass ratio of the powder in the slurry can be 20% to 40%, which provides the slurry with good fluidity and avoids excessive moisture content in the slurry that affects subsequent drying. It also avoids excessive powder content that causes problems such as powder agglomeration during the subsequent preparation process, which affects the preparation effect, and reduces the risk of clogging various components and channels in the battery powder preparation system 100. Of course, the mass ratio of the powder in the slurry can be less than 20% or greater than 40% according to actual preparation needs.

[0103] In the embodiment of the present application, the slurry is dispersed into nano-sized particles by a high-pressure disperser 20 , and then sent to a drying tower 10 for hot air drying to dry the nano-sized slurry particles into nano-sized powder particles.

[0104] The high-pressure disperser 20 is also called a high-pressure homogenizer or a nano-homogenizer. The high-pressure disperser 20 can generate a pressure of more than 1000 bar to effectively disperse the slurry into nanoparticles. The slurry particles are well dispersed and crushed in the high-pressure disperser 20 through cavitation effect, shear effect, and collision effect. Optionally, in some embodiments, the pressure applied to the slurry by the high-pressure disperser 20 is adjustable. In this case, the pressure of the high-pressure disperser 20 can be adjusted according to the type of powder actually prepared and the particle size requirements. The pressure can be adjusted to more than 1000 bar, for example, to 1500 bar or other values; the pressure can also be adjusted to less than 1000 bar, for example, to 800 bar or other values. The pressure in a specific application is not specifically limited here.

[0105] Optionally, the high-pressure disperser 20 can be, but is not limited to, a cavitation nozzle type, a Y-shaped interactive type, or a collision valve type as described in the following embodiments, wherein the cavitation nozzle type high-pressure disperser 20 is provided with a valve body in the fluid channel, the channel cross-sectional size in the valve body is gradually reduced, and the channel aperture in the valve body is small. Under the action of high pressure, the slurry passes through the valve body with a small aperture, generating a speed several times the speed of sound. At this time, a velocity gradient is generated, causing the particles or droplets to be torn and broken; and the slurry and the internal structure of the valve body undergo intense friction and collision, further refining the particles, thereby achieving nano-scale dispersion of the slurry. At the same time, the slurry pressure suddenly drops, causing cavitation bubbles to form and rupture inside the slurry, generating local high-pressure shock waves and destroying the particle structure. The Y-shaped, interactive high-pressure disperser 20 is equipped with at least two converging flow channels, the converging ends of which connect to an interactive chamber. When the slurry enters the interactive chamber under high pressure through the flow channels, it forms high-speed jets that collide with each other. This collision produces cavitation effects and high-frequency shearing effects, further reducing the slurry particle size and achieving the desired nanoscale dispersion effect. The structure of the collision valve-type high-pressure disperser 20 is described in detail in the following embodiments and is not further described here.

[0106] The drying tower 10 is a device for converting wet materials into dry powder. In the embodiment of the present application, hot air is used as a drying medium in the drying tower 10, and the hot air module 30 sends hot air into the drying tower 10. The hot air contacts the wet material, causing the moisture in the wet material to evaporate and achieve the purpose of drying. Specifically, the nano-scale slurry particles formed after dispersion treatment by the high-pressure disperser 20 are sprayed into the drying chamber 11 of the drying tower 10 from the first feed port 12. At the same time, the hot air module 30 blows hot air from the first feed port 12 into the drying chamber 11, so that the slurry particles and the hot air are parallel and in contact with each other. The hot air can evaporate the moisture carried by the slurry particles, thereby converting the slurry particles into powder particles. In this process, the hot air can also be used to drive the slurry particles and / or powder particles to move, so that the powder particles are blown to the first discharge port 13 and discharged from the drying tower 10 into the receiving module 40 along with the air flow.

[0107] Optionally, the first feed port 12 is arranged at the top of the drying tower 10, and the first discharge port 13 is arranged at the bottom of the drying tower 10; in this arrangement, the slurry particles and powder particles will descend and be dried in parallel with the hot air in the drying chamber 11, and be discharged from the first discharge port 13 at the bottom, which can reduce the risk of powder accumulating in the drying chamber 11 and being unable to be discharged smoothly.

[0108] The hot air module 30 is a device for supplying hot air to the drying tower 10. It is provided with a gas flow channel and a heating structure for heating the gas. The outlet of the gas flow channel is connected to the first feed port 12 of the drying tower 10. The heating structure can be configured as a heat exchanger, with at least a portion of the gas flow channel located in the heat exchanger. The heat exchanger is also provided with a hot fluid channel for passing a hot fluid such as hot air or hot liquid. The hot fluid can transfer its heat to the heat exchanger, which then transfers the heat to the gas in the gas flow channel through the heat exchanger, so that the gas absorbs the heat and forms hot air. Alternatively, the heating structure can be configured as a burner 34. The burner 34 is provided with a heating chamber. The gas flow channel includes an inlet channel and an outlet channel. The inlet channel is connected to the air inlet of the heating chamber, and the outlet channel is connected to the air outlet of the heating chamber. The burner 34 can send fuel gas into the heating chamber to mix with the gas sent into the heating chamber through the inlet channel to form a mixed gas. The mixed gas is burned to form hot air, which is then sent to the drying tower 10 through the outlet channel.

[0109] The collecting module 40 is used to collect powder and can be set as a bag-type collector, a cyclone collector, etc. Optionally, the collecting module 40 can also be provided with at least one powder processing structure such as a vibrating screen 441 and a first iron remover 442. The vibrating screen 441 is used to screen the powder to remove powder particles with a particle size that exceeds the required particle size. The first iron remover 442 can be used to remove metal particles in the powder to improve the purity of the powder.

[0110] That is, in the embodiment of the present application, a high-pressure disperser 20 is used to perform nano-dispersion treatment on the slurry so that the slurry is dispersed into nano-particles and sprayed into the drying tower 10. At the same time, the hot air module 30 blows hot air into the drying tower 10 so that the nano-slurry particles and the hot air are dried in parallel to form nano-powder particles. The nano-powder particles can be discharged from the first discharge port 13 with the air flow so that the nano-powder particles are collected by the receiving module 40, thereby completing the nano-preparation of the battery powder. The prepared powder has a narrow particle size distribution, good particle sphericity, and uniform specific surface area; it is beneficial to shorten the diffusion distance of lithium ions in the final prepared battery and accelerate the electrochemical reaction rate during the charge and discharge process. A larger specific surface area provides more active sites, enhances the contact between the electrode material and the electrolyte, thereby improving the lithium ion insertion / extraction efficiency, achieving higher capacity and fast charge and discharge capabilities, making the lithium ion flow uniform, reducing dendrite formation, reducing the risk of short circuit, and thus improving battery performance.

[0111] In one embodiment, the high-pressure disperser 20 includes a valve seat 21, a homogenizing valve 22, a collision ring 23 and a pump body (not shown), wherein the valve seat 21 is provided with a slurry channel 211, and a slurry inlet 212 and a slurry discharge port 213 which are connected to the slurry channel 211 and are respectively located at both ends of the slurry channel 211; the homogenizing valve 22 and the slurry discharge port 213 are arranged opposite to each other, and the homogenizing valve 22 and the valve seat 21 are spaced apart to form a first feed slit 24; the collision ring 23 is arranged around the outside of the first feed slit 24; the pump body is configured to inject slurry from the slurry inlet 212 into the slurry channel 211.

[0112] In this embodiment, the battery powder preparation system 100 uses a collision valve type high-pressure disperser 20. The slurry is nano-processed in the high-pressure disperser 20 under the combined effects of impact effect, shear effect and cavitation effect to form nano-sized slurry particles, and the slurry is evenly dispersed.

[0113] Specifically, in the collision valve type high-pressure disperser 20, a slurry channel 211 for slurry to pass through is provided in the valve seat 21, and a homogenizing valve 22 is provided on the outside of the slurry discharge port 213 of the valve seat 21. The end face of the valve seat 21 having the slurry discharge port 213 is spaced apart from the homogenizing valve 22 to form a first feed slit 24 between the homogenizing valve 22 and the end face of the valve seat 21, and the first feed slit 24 is arranged around the circumference of the slurry discharge port 213; a collision ring 23 is also provided on the outside of the feed slit, and the collision ring 23 is arranged around the circumference of the first feed slit 24; the pump body is used to inject the slurry into the slurry channel 211, and apply pressure to the slurry so that the hydraulic pressure reaches the required pressure, thereby accelerating the flow rate of the slurry in the high-pressure disperser 20 and generating high shear force and high collision force.

[0114] This setting is to use a collision valve type high-pressure disperser 20 in the battery powder preparation system 100. When the high-pressure disperser 20 is running, the slurry is injected into the slurry channel 211 by the pump body to quickly flow toward the slurry discharge port 213, so that the slurry hits the homogenizing valve 22 and the collision ring 23 at a relatively high speed. This impact force will cause the droplets to be effectively broken. Moreover, when the slurry passes through the slit between the homogenizing valve 22 and the valve seat 21 at high speed, the droplets in the slurry are first extended and then sheared and broken by the turbulence. At the same time, the slurry will produce a significant pressure drop. At this time, some of the droplets in the slurry will quickly vaporize and produce numerous bubbles. As the slurry is discharged from the first slit 24, the pressure rise will cause the bubbles to collapse, forming a large number of cavities. When the cavities collapse, huge energy is released to generate high-frequency vibrations, which further promote the breakage of the slurry. That is, the slurry is nano-processed in the high-pressure disperser 20 under the combined effects of the impact effect, the shear effect, and the cavitation effect, thereby forming nano-sized slurry particles, and the slurry is evenly dispersed.

[0115] Optionally, the collision ring 23 can be simultaneously arranged around the outside of the homogenizing valve 22 adjacent to the valve seat 21, and spaced apart from the homogenizing valve 22. At this time, a second feed slit 25 is formed between the collision ring 23 and the homogenizing valve 22. The slurry after colliding with the collision ring 23 passes through the second feed slit 25, which is conducive to promoting further dispersion of the slurry.

[0116] Optionally, the valve seat 21 includes a seat body and a raised portion, the raised portion is protruding from the side surface of the seat body facing the homogenizing valve 22, and the slurry channel 211 is set through the seat body and the raised portion. At this time, the collision ring 23 can be set around the outside of the first feed slit 24 and at least part of the raised portion; optionally, the collision ring 23 can be made to contact the surface of the seat body facing the homogenizing valve 22, for example, the collision ring 23 can be connected to the seat body to stabilize the position of the collision ring 23 and improve the overall structural stability of the high-pressure disperser 20.

[0117] Alternatively, the pump body can be configured as a plunger pump, comprising a pump housing and a plunger. The pump housing is provided with a piston chamber, one end of the piston chamber is provided with a material inlet, and the sidewall of the piston chamber is provided with a material outlet. The plunger is movably disposed in the piston chamber. When the plunger moves in a direction away from the material inlet, the slurry is sucked into the piston chamber from the material inlet. The plunger needs to be moved to a position passing the material outlet. At this time, the material inlet and the material outlet are both located on the same side of the plunger. When the plunger moves toward the material inlet and the material outlet, the slurry can be pressed into the material outlet to be discharged from the material outlet and thus injected into the valve seat 21, thereby achieving slurry injection into the valve seat 21. Optionally, a feed check valve can be provided at the material inlet and a discharge check valve can be provided at the material outlet to prevent part of the slurry from being discharged from the material inlet when the plunger moves toward the material inlet and the material outlet to discharge the slurry from the material outlet. In addition, when the plunger moves in a direction away from the material inlet to allow the pump body to extract the slurry, the slurry in the valve body can be prevented from being drawn back into the pump body from the material outlet.

[0118] In one embodiment, the homogenizing valve 22 can be moved closer to or farther from the valve seat 21 to adjust the width of the first feed slit 24 .

[0119] In this embodiment, the installation position of the homogenizing valve 22 can be adjusted toward or away from the valve seat 21 to control the width of the first feed slit 24 between the homogenizing valve 22 and the valve seat 21. This can also control the impact force of the slurry when it strikes the homogenizing valve 22, thereby adjusting the particle size of the dispersed slurry to meet the production requirements of different powder particle sizes. In addition, because the slurry channel 211 in the valve body is connected to the pump body, adjusting the width of the first feed slit 24 can also control the pressure in the slurry channel 211 and the pump body, thereby controlling the pressure applied to the slurry.

[0120] In one embodiment, the battery powder preparation system 100 further includes a feeding pipe 16 and an ultrasonic generator (not shown), wherein both ends of the feeding pipe 16 are respectively connected to the high-pressure disperser 20 and the first feed port 12; the ultrasonic generator is connected to the feeding pipe 16 and is configured to radiate ultrasonic waves into the feeding pipe 16.

[0121] In this embodiment, the high-pressure disperser 20 is connected to the drying tower 10 via a feed pipe 16, and an ultrasonic generator is provided for radiating ultrasonic waves to the feed pipe 16. In this arrangement, the slurry crushed by the high-pressure disperser 20 is transported to the drying tower 10 via the feed pipe 16. During the process of transporting the slurry to the drying tower 10, the slurry particles are acted upon by ultrasound, so that the slurry particles remain uniformly dispersed, the agglomeration of the particles is reduced, and the particle size of the final prepared powder is ensured.

[0122] In one embodiment, the battery powder preparation system 100 further includes an air supply module 50 , which is in communication with the first feed port 12 . The air supply module 50 is configured to blow gas into the first feed port 12 .

[0123] In this embodiment, the air supply module 50 may be provided with a gas tank as an air source for providing compressed air or inert gas to the drying tower 10. The air supply module 50 may also be provided with an air booster 52, such as an air compressor or an air pump, which can extract and pressurize gas and supply the pressurized gas to the drying tower 10. Optionally, a second filter 53 may be provided on the air supply line 51 of the air supply module 50 to filter the gas blown into the drying tower 10, reduce impurities in the gas, and prevent impurities from mixing into the powder and affecting the purity of the slurry.

[0124] In the embodiment of the present application, while the high-pressure disperser 20 sprays the high-pressure dispersed slurry into the drying tower 10 and the hot air module 30 blows hot air into the drying tower 10, the air supply module 50 can be used to blow high-pressure gas into the drying tower 10. High-pressure gas generally refers to gas with a pressure greater than 10 MPa. In some embodiments, the air pressure supplied by the air supply module 50 to the drying tower 10 can also be gas with any pressure value greater than 0.1 MPa. With this arrangement, the slurry can be sprayed into the drying tower 10 simultaneously with the hot air and the high-pressure gas. Under the action of the hot air and the high-pressure gas, the nano-sized particles are kept in the drying tower 10 and dried to form nano-powder particles, which can reduce or avoid the occurrence of particle agglomeration.

[0125] In one embodiment, the hot air module 30 includes a first hot air pipeline 31 and a first heat exchanger 32, the first hot air pipeline 31 is connected to the first feed port 12; the first heat exchanger 32 is arranged in the first hot air pipeline 31, and the first heat exchanger 32 is configured to exchange heat with the first hot air pipeline 31 to increase the temperature of the air flow in the first hot air pipeline 31.

[0126] In this embodiment, a first hot air pipeline 31 and a first heat exchanger 32 are provided in the hot air module 30. A hot fluid channel is provided in the first heat exchanger 32. The hot fluid channel is used to heat the liquid or hot gas. The first hot air pipeline 31 can be passed through the first heat exchanger 32 or attached to the surface of the first heat exchanger 32; for example, in some embodiments, the first hot air pipeline 31 includes a heat exchange channel provided in the first heat exchanger 32, an inlet channel connected to the air inlet end of the heat exchange channel, and an outlet channel connected to the air outlet end of the heat exchange channel and the first feed port 12; optionally, the inlet channel and the outlet channel are respectively detachably connected to the heat exchange channel.

[0127] In the embodiment of the present application, during the powder preparation process, a hot fluid such as a hot liquid or hot gas flows in the hot fluid channel of the first heat exchanger 32, so that the heat of the hot fluid is transferred to the first heat exchanger 32. The first heat exchanger 32 then transfers the heat to the airflow in the first hot air duct 31, thereby heating the airflow in the first hot air duct 31. This arrangement prevents the gas in the first hot air duct 31 from directly contacting an open flame, thus avoiding the occurrence of explosive combustion when using the battery powder preparation system 100 to prepare explosive powder. Optionally, the gas in the first hot air duct 31 can be air or an inert gas.

[0128] In one embodiment, the hot air module 30 also includes a second hot air pipeline 33 and a burner 34. The second hot air pipeline 33 is connected to the hot fluid channel of the first heat exchanger 32; the burner 34 is arranged in the second hot air pipeline 33 and is used to heat the airflow in the second hot air pipeline 33.

[0129] In this embodiment, the hot air module 30 includes a second hot air pipeline 33 for providing a hot air flow to the first heat exchanger 32. The air flow in the second hot air pipeline 33 is heated by a burner 34. The burner 34 is provided with a heating chamber. The gas flow path includes an inlet channel and an outlet channel. The inlet channel is connected to the air inlet of the heating chamber, and the outlet channel is connected to the air outlet of the heating chamber and the hot fluid channel in the first heat exchanger 32. The burner 34 can deliver fuel gas into the heating chamber, where it mixes with the gas delivered into the heating chamber through the inlet channel to form a mixed gas. The mixed gas is burned to form hot air. The hot air is delivered along the outlet channel to the hot fluid channel of the first heat exchanger 32 to heat the first heat exchanger 32, allowing the first heat exchanger 32 to heat the air flow in the first hot air pipeline 31. This configuration allows the first heat exchanger 32 to continuously absorb heat, ensuring that the air flow in the first hot air pipeline 31 absorbs sufficient heat to increase its temperature, thereby ensuring the powder drying effect.

[0130] In one embodiment, the first hot air pipeline 31 is provided with a first communication point 311 downstream of the first heat exchanger 32 , and the second hot air pipeline 33 is provided with a second communication point 331 between the burner 34 and the first heat exchanger 32 .

[0131] The hot air module 30 also includes a third hot air pipeline 35, a first control valve 36 and a second control valve 37. The two ends of the third hot air pipeline 35 are respectively connected to the first connecting position 311 and the second connecting position 331; the first control valve 36 is arranged in the third hot air pipeline 35; the second control valve 37 is arranged in the second hot air pipeline 33 and is located downstream of the second connecting position 331.

[0132] In this embodiment, the hot air module 30 further includes a third hot air pipeline 35, the ends of which are connected to the first hot air pipeline 31 and the second hot air pipeline 33, respectively. Optionally, the first connecting point 311 provided on the first hot air pipeline 31 can be provided in the area between the first heat exchanger 32 and the first feed inlet 12 of the drying tower 10, or the first connecting point 311 can be provided at the air outlet end of the first hot air pipeline 31, in which case the third hot air pipeline 35 is directly connected to the first feed inlet 12. In addition, a first control valve 36 is provided on the third hot air pipeline 35 for controlling the conduction state of the third hot air pipeline 35, and a second control valve 37 is provided on the second hot air pipeline 33, located downstream of the second connecting point 331 and used to control the conduction state of the second hot air pipeline 33. The flow direction of the hot air in the second hot air pipeline 33 can be controlled by controlling the conduction state of the second hot air pipeline 33 and the third hot air pipeline 35.

[0133] This configuration allows the airflow in the first hot air pipeline 31 or the second hot air pipeline 33 to be selected to enter the drying tower 10 for drying the powder according to usage requirements. For example, when using the battery powder preparation system 100 to prepare powder with a risk of combustion and explosion, the first hot air pipeline 31 is used to supply hot air to the drying tower 10 to reduce the risk of combustion and explosion. In this case, the first control valve 36 is in a state that blocks the third hot air pipeline 35, and the second control valve 37 is in a state that connects the second hot air pipeline 33. The hot air blown out of the second hot air pipeline 33 is not supplied to the drying tower 10 through the third hot air pipeline 35, but is instead blown to the first heat exchanger 32 to heat the airflow in the first hot air pipeline 31.

[0134] When using the battery powder preparation system 100 to prepare powder without causing combustion or explosion problems, the hot air from either the first hot air pipeline 31 or the second hot air pipeline 33 can be selected to flow into the drying tower 10. Specifically, the first control valve 36 can be placed in a state that blocks the third hot air pipeline 35, and the second control valve 37 can be placed in a state that connects the second hot air pipeline 33. The hot air blown out of the second hot air pipeline 33 will not be supplied to the drying tower 10 through the third hot air pipeline 35, but will instead be blown to the first heat exchanger 32 to heat the airflow in the first hot air pipeline 31. Alternatively, the first control valve 36 can be placed in a state that opens the third hot air pipeline 35, and the second control valve 37 can be placed in a state that closes the second hot air pipeline 33. The hot air blown out of the second hot air pipeline 33 can be directly supplied to the drying tower 10 through the third hot air pipeline 35. When the hot air from the second hot air pipeline 33 is blown to the drying tower 10 through the third hot air pipeline 35, the heating efficiency is high due to the use of the burner 34 to heat the airflow, thereby reducing heat energy loss. In some embodiments, both the second hot air pipeline 33 and the third hot air pipeline 35 can be placed in a conductive state. In this case, a portion of the hot air in the second hot air pipeline 33 is blown to the first heat exchanger 32 to heat the airflow in the first hot air pipeline 31, and the remaining portion is supplied to the drying tower 10 through the third hot air pipeline 35.

[0135] In one embodiment, the hot air module 30 further includes a first filter 39 . The first filter 39 is disposed at the air inlet of the hot air module 30 .

[0136] This arrangement can filter the airflow entering the hot air module 30 to remove foreign matter such as powder in the airflow, prevent impurities in the airflow from mixing into the prepared powder, and thus improve the purity of the prepared powder.

[0137] Optionally, in some embodiments, the hot air module 30 is provided with a first hot air duct 31 and a second hot air duct 33, and a first filter 39 can be provided at the air flow inlet of the first hot air duct 31, and a first filter 39 can be provided at the air flow inlet of the second hot air duct 33; of course, a first filter 39 can be provided at the air flow inlet of the first hot air duct 31 and the air flow inlet of the second hot air duct 33, respectively.

[0138] In one embodiment, the material collecting module 40 includes a gas-solid separation structure 41 and a powder collecting tank 42. The gas-solid separation structure 41 is provided with a gas-solid separation chamber, a second feed port 411 connected to the gas-solid separation chamber, a second discharge port 412 and an exhaust port 413. The second feed port 411 is connected to the first discharge port 13. The powder collecting tank 42 is provided with a powder collecting chamber and a third feed port 421 connected to the powder collecting chamber. The third feed port 421 is connected to the second discharge port 412.

[0139] In this embodiment, the gas-solid separation structure 41 can be configured as a bag-type receiver, a cyclone receiver, etc. After the dried powder is discharged from the drying tower 10 with the airflow, it first enters the gas-solid separation structure 41 to separate the powder from the airflow. The airflow is discharged from the exhaust port 413, and the powder is discharged from the second discharge port 412 to be transported to the powder collection tank 42 for powder recovery. Optionally, the second discharge port 412 is set at the bottom of the gas-solid separation structure 41, and at least part of the gas-solid separation chamber is configured as a structure with a cross-section that tapers from top to bottom, which is conducive to gathering the powder so that the powder accurately enters the second discharge port 412, and is also conducive to reducing the powder adhering to the cavity wall of the gas-solid separation chamber.

[0140] Optionally, at least part of the powder collecting chamber is configured as a structure with a cross-section that tapers from top to bottom, which is conducive to gathering the powder so that the powder settles downward to gather at the bottom of the powder collecting chamber, or when the powder collecting tank 42 is provided with a third discharge port 422 located at the bottom, it is conducive to allowing the powder to smoothly fall into the third discharge port 422 at the bottom to be discharged outward.

[0141] In one embodiment, the hot air module 30 is provided with a second heat exchanger 38, which is configured to heat the airflow in the hot air module 30; the receiving module 40 also includes an exhaust pipe 47, which is connected to the exhaust port 413 and passes through the second heat exchanger 38, so that the second heat exchanger 38 absorbs the heat of the airflow in the exhaust pipe 47.

[0142] As will be appreciated, the airflow exiting the drying tower 10 still contains residual heat. In this embodiment, the exhaust gas discharged from the gas-solid separation structure 41 is directed to the second heat exchanger 38 of the hot air module 30 via the exhaust pipe 47. The heat carried by the exhaust gas is absorbed by the second heat exchanger 38 and used to heat the airflow in the hot air module 30, thereby recycling heat, improving energy efficiency, and reducing energy loss. Optionally, a fan 48 can be provided on the exhaust pipe 47 to provide power for the exhaust gas flow.

[0143] Optionally, a first hot air duct 31 and a second hot air duct 33 can be set in the hot air module 30, and a second heat exchanger 38 can be set in one of the first hot air duct 31 and the second hot air duct 33, or a second heat exchanger 38 can be set in both the first hot air duct 31 and the second hot air duct 33. In this case, the exhaust pipe 47 can pass through the second heat exchanger 38 set in the first hot air duct 31 and the second heat exchanger 38 set in the second hot air duct 33, or two branch pipes can be set on the exhaust pipe 47, so that one of the branch pipes passes through the second heat exchanger 38 set in the first hot air duct 31, and the other branch pipe passes through the second heat exchanger 38 set in the second hot air duct 33.

[0144] In one embodiment, a third discharge port 422 communicating with the powder collecting chamber is provided at the bottom of the powder collecting tank 42 . The collecting module 40 further includes a grinder 43 , which is provided at the third discharge port 422 .

[0145] In this embodiment, a pulverizer 43 is provided at the third discharge port 422 of the powder collecting tank 42. With this arrangement, the powder collected in the powder collecting tank 42 can be pulverized and deagglomerated by the pulverizer 43, thereby deagglomerating the agglomerated powder and ensuring the powder particle size.

[0146] In one embodiment, the material receiving module 40 further includes a powder processing module 44 . The powder processing module 44 is disposed downstream of the powder collecting tank 42 . The powder processing module 44 includes at least one of a vibrating screen 441 and a first iron remover 442 .

[0147] In this embodiment, the collected powder can be processed by the powder processing module 44, wherein the vibrating screen 441 uses the exciting force generated by the vibration motor or the vibrator to make the screen surface vibrate periodically. The powder is subjected to the vibration on the screen surface, causing jumping and sliding, thereby realizing the grading and screening of the powder. Through the setting of the vibrating screen 441, the powder discharged from the powder collection tank 42 can be screened in the vibrating screen 441 to screen out powder particles that do not meet the particle size requirements and ensure the yield of powder preparation. The first iron remover 442 is a device for removing ferromagnetic impurities in the material. The first iron remover 442 is set in the material receiving module 40, and the powder discharged from the powder collection tank 42 can enter the first iron remover 442 to remove ferromagnetic impurities mixed in the powder and improve the purity of the powder.

[0148] Optionally, the powder processing module 44 may be provided with one of the vibrating screen 441 and the first iron remover 442 , or may include both the vibrating screen 441 and the first iron remover 442 .

[0149] In one embodiment, the material receiving module 40 includes at least two groups of powder processing modules 44, and the feed ends of the at least two groups of powder processing modules 44 are respectively connected to the third discharge port 422 of the powder collecting tank 42, and the powder processing module 44 includes at least one of a vibrating screen 441 and a first iron remover 442.

[0150] This arrangement, by providing at least two groups of powder collection modules, allows for the situation where one group of powder processing modules 44 fails or undergoes cleaning or maintenance, while other powder processing modules 44 in the collecting module 40 can perform processing operations to screen the powder and / or remove ferromagnetic impurities.

[0151] Optionally, the structures set on the two groups of powder collection modules may be the same or different. For example, one group of powder collection modules may be provided with one of the vibrating screen 441 and the first iron remover 442, and the other group of powder collection modules may be provided with the vibrating screen 441 and the other of the first iron remover 442, or may be provided with both the vibrating screen 441 and the first iron remover 442.

[0152] In one embodiment, the powder collecting tank 42 is provided with a gas outlet 423 communicating with the powder collecting chamber, and the collecting module 40 further includes a vacuum pump 45 communicating with the gas outlet 423 .

[0153] In this embodiment, during the process of collecting powder, the vacuum pump 45 performs vacuum treatment on the powder collection chamber to form a negative pressure environment in the powder collection chamber, so that the powder has the power to move from the gas-solid separator to the powder collection tank 42, so that the powder can be smoothly transferred to enter the powder collection chamber.

[0154] In one embodiment, the collecting module 40 further includes a vibrator 46 . The vibrator 46 is disposed on an outer wall of the powder collecting tank 42 . The vibrator 46 is configured to provide a vibration force to the powder collecting tank 42 to shake off the powder.

[0155] In this embodiment, the vibrator 46 can provide an impact force to the powder collection tank 42 to shake off the powder, thereby preventing the powder from adhering to the cavity wall, blocking the third discharge port 422, or forming bridges in the powder collection cavity, thereby ensuring that the powder is smoothly discharged from the powder collection tank 42. Optionally, the vibrator 46 can be configured as an air hammer, a vibration motor, an electromagnetic vibrator, or an exciter.

[0156] In one embodiment, the gas-solid separation structure 41 is configured as a bag-type receiver.

[0157] In this embodiment, the gas-solid separation structure 41 is configured as a bag-type receiver. The bag-type receiver primarily filters the gas containing powder through a filter bag, trapping the powder on the filter bag surface while the gas is discharged from the exhaust port 413, thereby achieving separation of the gas and powder. Powder on the filter bag surface can be shaken off by pulse blowing, backblowing, or mechanical vibration, allowing the powder to be discharged from the bag-type receiver. The bag-type receiver has high powder recovery efficiency, can reduce powder recovery losses, and is convenient for powder recovery.

[0158] In one embodiment, the gas-solid separation structure 41 further includes a star-shaped discharge valve 49 . The star-shaped discharge valve 49 is disposed at the second discharge port 412 , and a valve cavity of the star-shaped discharge valve 49 is connected to the third feed port 421 .

[0159] In this embodiment, a star-shaped unloading valve 49 is provided at the second discharge port 412 of the gas-solid separation structure 41. The star-shaped unloading valve 49 includes a valve body and an impeller. The valve body is provided at the second discharge port 412 and is provided with a valve cavity connected to the second discharge port 412; the impeller is rotatably provided in the valve cavity, and the impeller divides the valve cavity into at least two accommodating spaces arranged along the circumference of the impeller, one of the accommodating spaces is connected to the gas-solid separation structure 41, and the other accommodating space is connected to the third feed port 421.

[0160] During specific use, the powder is transported by the rotating impeller in the star-shaped discharge valve 49. The impeller can keep the gas-solid separation structure 41 and the powder collection tank 42 in a non-conductive state at all times, so as to play a sealing role, prevent the vacuum or negative pressure state in the powder collection chamber from being destroyed, and ensure that the powder can be sucked into the powder collection chamber.

[0161] In one embodiment, the first discharge port 13 is located at the bottom of the drying tower 10, and the battery powder preparation system 100 also includes a connecting pipe 14, which includes a first section 141 and a second section 142. One end of the first section 141 is connected to the first discharge port 13 and extends downward from the first discharge port 13. The second section 142 extends upward from the first section 141, and the end of the second section 142 away from the first section 141 is connected to the receiving module 40.

[0162] In this embodiment, powder particles can be discharged smoothly from the first discharge port 13 at the bottom of the drying tower 10, preventing powder accumulation in the drying chamber 11. The discharged powder is then transported to the receiving mechanism along the connecting pipe 14. The connecting pipe 14 includes a first section 141 and a second section 142. The first section 141 extends downward from the first discharge port 13, and the second section 142 extends upward from the first section 141. The end of the second section 142 away from the first section 141 is connected to the receiving module 40. This arrangement eliminates the need to place the receiving module 40 below the drying tower 10, allowing the receiving module 40 to be arranged parallel to the drying tower 10, facilitating the layout of the battery powder preparation system 100.

[0163] Optionally, at least part of the drying chamber 11 is configured to have a structure with a cross-section that tapers from top to bottom, which helps to gather the powder so that the powder accurately enters the first discharge port 13 and also helps to reduce the powder adhering to the cavity wall of the drying chamber 11.

[0164] In one embodiment, the connection position between the first section 141 and the second section 142 is set to an arc structure; with this setting, the airflow and powder flow in the connecting tube 14 are smoother, which is conducive to reducing flow resistance and reducing the risk of powder clogging the connecting tube 14.

[0165] In one embodiment, a drain outlet is provided at the connection position of the first section 141 and the second section 142. The battery powder preparation system 100 also includes a drain valve 15, which is provided at the drain outlet. The drain valve 15 is configured to control the connectivity between the drain outlet and the external environment.

[0166] With this arrangement, when the drying tower 10 needs to be cleaned, the drain valve 15 can be opened to connect the drain port to the outside environment. Dirt and cleaning liquid in the drying tower 10 and the connecting pipe 14 can be discharged to the outside through the drain port, making cleaning easier.

[0167] In one embodiment, the battery powder preparation system 100 further includes a feed pipe 60, which is connected to the slurry inlet of the high-pressure disperser 20; the battery powder preparation system 100 further includes a slurry tank 70, which is connected to the slurry inlet 61 of the feed pipe 60, and the slurry tank 70 is configured to store slurry.

[0168] This arrangement allows sufficient slurry to be stored in the slurry tank 70 to continuously provide slurry to the high-pressure disperser 20 without the need for manual multiple replenishment, thereby improving ease of use.

[0169] In one embodiment, the battery powder preparation system 100 further includes a slurry processing module 80 , which is disposed between the slurry inlet 61 of the feed pipe 60 and the high-pressure disperser 20 , and includes at least one of a slurry filter and a second iron remover.

[0170] In this embodiment, the slurry can be pre-treated by the slurry processing module 80 before being sent to the high-pressure disperser 20; the slurry processing module 80 can include a slurry filter to filter the slurry to remove or reduce impurities in the slurry and improve the purity of the prepared powder.

[0171] The slurry processing module 80 may also include a second iron remover, which is a device for removing ferromagnetic impurities in the material. The second iron remover is used to remove ferromagnetic impurities mixed in the slurry, thereby improving the purity of the prepared powder.

[0172] Optionally, the slurry processing module 80 may include one of a slurry filter and a second iron remover, or may include both a slurry filter and a second iron remover.

[0173] In one embodiment, the battery powder preparation system 100 further includes a water storage tank 90 , which is in communication with the cleaning liquid inlet 62 of the feeding pipe 60 . The water storage tank 90 is configured to store the cleaning liquid.

[0174] In this embodiment, when it is necessary to clean the high-pressure disperser 20, the drying tower 10, the feed pipe 60 and other structures in the battery powder preparation system 100, the injection of slurry into the battery powder preparation system 100 can be suspended, and the cleaning liquid in the water storage tank 90 can be sent into the high-pressure disperser 20 and the drying tower 10 and other structures through the feed pipe 60. The cleaning liquid is used to clean each structure, thereby improving the convenience of cleaning the battery powder preparation system 100.

[0175] The present application also proposes a battery production line, which includes the battery powder preparation system 100 as described in any of the aforementioned embodiments.

[0176] This configuration, when used in a battery production line using the battery powder preparation system 100 of the aforementioned embodiment, produces powder with a narrow particle size distribution, good particle sphericity, and uniform surface area. This helps shorten the diffusion distance of lithium ions in the final battery and accelerates the electrochemical reaction rate during charge and discharge. The larger surface area provides more active sites, enhancing contact between the electrode material and the electrolyte, thereby improving lithium ion insertion and extraction efficiency, achieving higher capacity and rapid charge and discharge capabilities, and making lithium ion flow uniform, reducing dendrite formation and the risk of short circuits, thereby improving battery performance.

[0177] Since the battery production line proposed in this application can adopt any of the technical solutions in the aforementioned embodiments, it at least has all the beneficial effects brought by the aforementioned technical solutions, which will not be described one by one here.

[0178] The above description is merely an exemplary embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A battery powder preparation system, characterized in that: include: A drying tower, the drying tower being provided with a drying chamber, a first feed port and a first discharge port communicating with the drying chamber; a high-pressure disperser, the high-pressure disperser being in communication with the first feed port, the high-pressure disperser being configured to crush the slurry into nanoparticles and feed the nanoparticles to the first feed port; a hot air module, the hot air module being in communication with the first feed inlet and configured to blow hot air into the first feed inlet; as well as A material receiving module is connected to the first discharge port and is configured to collect powder.

2. The battery powder preparation system according to claim 1, characterized in that: The high-pressure disperser comprises: A valve seat is provided with a slurry channel, and a slurry inlet and a slurry outlet communicated with the slurry channel and respectively located at two ends of the slurry channel; A homogenizing valve, the homogenizing valve being arranged opposite to the slurry discharge port, and the homogenizing valve being spaced apart from the valve seat to form a first material passing slit; a collision ring, the collision ring being disposed around the outside of the first material passing slit; and A pump body is configured to inject slurry from the slurry inlet into the slurry channel.

3. The battery powder preparation system according to claim 2, characterized in that: The homogenizing valve can be moved closer to or farther from the valve seat to adjust the width of the first material passing slit.

4. The battery powder preparation system according to claim 1, characterized in that: The battery powder preparation system also includes: a feeding pipe, wherein both ends of the feeding pipe are respectively connected to the high-pressure disperser and the first feeding port; and An ultrasonic generator is connected to the feeding tube and is configured to radiate ultrasonic waves into the feeding tube.

5. The battery powder preparation system according to claim 1, characterized in that: The battery powder preparation system further includes an air supply module, which is connected to the first feed port and is configured to blow gas into the first feed port.

6. The battery powder preparation system according to any one of claims 1 to 5, characterized in that: The hot air module comprises: a first hot air pipeline, the first hot air pipeline being in communication with the first feed port; and A first heat exchanger is provided in the first hot air pipeline, and the first heat exchanger is configured to exchange heat with the first hot air pipeline to increase the temperature of the airflow in the first hot air pipeline.

7. The battery powder preparation system according to claim 6, characterized in that: The hot air module also includes: a second hot air pipeline, the second hot air pipeline being in communication with the hot fluid channel of the first heat exchanger; and A burner is provided in the second hot air pipeline and is used to heat the air flow in the second hot air pipeline.

8. The battery powder preparation system according to claim 7, characterized in that: The first hot air pipeline is provided with a first communication position located downstream of the first heat exchanger, and the second hot air pipeline is provided with a second communication position located between the burner and the first heat exchanger; The hot air module also includes: a third hot air pipeline, wherein both ends of the third hot air pipeline are respectively connected to the first communication position and the second communication position; a first control valve, the first control valve being provided in the third hot air pipeline; and A second control valve is provided in the second hot air pipeline and is located downstream of the second communication position.

9. The battery powder preparation system according to any one of claims 1 to 5, characterized in that: The hot air module further includes a first filter, which is arranged at the air flow inlet of the hot air module.

10. The battery powder preparation system according to any one of claims 1 to 5, characterized in that: The receiving module comprises: A gas-solid separation structure, wherein the gas-solid separation structure is provided with a gas-solid separation chamber, a second feed port communicating with the gas-solid separation chamber, a second discharge port, and an exhaust port, wherein the second feed port is communicated with the first discharge port; A powder collecting tank is provided with a powder collecting cavity and a third feed port communicating with the powder collecting cavity, wherein the third feed port is communicated with the second discharge port.

11. The battery powder preparation system according to claim 10, characterized in that: The hot air module is provided with a second heat exchanger, and the second heat exchanger is configured to heat the airflow in the hot air module; The receiving module further includes an exhaust pipe, which is communicated with the exhaust port and passes through the second heat exchanger so that the second heat exchanger absorbs heat from the airflow in the exhaust pipe.

12. The battery powder preparation system according to claim 10, characterized in that: The bottom of the powder collecting tank is provided with a third discharge port communicating with the powder collecting chamber, and the collecting module further comprises a grinder, which is provided at the third discharge port; And / or, the material receiving module further comprises a powder material processing module, the powder material processing module is arranged downstream of the powder material collecting tank, and the powder material processing module comprises at least one of a vibrating screen and a first iron remover; And / or, the material receiving module includes at least two groups of powder processing modules, the feed ends of the at least two groups of powder processing modules are respectively connected to the third discharge port of the powder collection tank, and the powder processing module includes at least one of a vibrating screen and a first iron remover.

13. The battery powder preparation system according to claim 10, characterized in that: The powder collecting tank is provided with a gas outlet connected to the powder collecting chamber, and the collecting module further comprises a vacuum pump connected to the gas outlet; And / or, the material collecting module further includes a vibrator, which is provided on the outer wall of the powder collecting tank, and is configured to provide a vibration force to the powder collecting tank to shake off the powder.

14. The battery powder preparation system according to claim 10, characterized in that: The gas-solid separation structure is configured as a bag-type material receiver; And / or, the gas-solid separation structure further includes a star-shaped discharge valve, which is arranged at the second discharge port, and the valve cavity of the star-shaped discharge valve is connected to the third feed port.

15. The battery powder preparation system according to any one of claims 1 to 5, characterized in that: The first discharge port is located at the bottom of the drying tower, and the battery powder preparation system further includes a connecting pipe; The connecting pipe includes a first section and a second section, one end of the first section is connected to the first discharge port and extends downward from the first discharge port, the second section extends upward from the first section, and one end of the second section away from the first section is connected to the receiving module; Wherein, the connection position between the first section and the second section is set as an arc structure; And / or, a drain outlet is provided at the connection position of the first section and the second section, and the battery powder preparation system further includes a drain valve, which is provided at the drain outlet and is configured to control the connectivity between the drain outlet and the external environment.

16. The battery powder preparation system according to any one of claims 1 to 5, characterized in that: The battery powder preparation system further comprises a feed pipe, which is connected to a slurry inlet of the high-pressure disperser; Wherein, the battery powder preparation system further includes a slurry tank, the slurry tank is communicated with the slurry inlet of the feed pipe, and the slurry tank is configured to store slurry; And / or, the battery powder preparation system further comprises a slurry processing module, the slurry processing module is arranged between the slurry inlet of the feed pipe and the high-pressure disperser, the slurry processing module comprises at least one of a slurry filter and a second iron remover; And / or, the battery powder preparation system further includes a water storage tank, which is communicated with the cleaning liquid inlet of the feeding pipe, and the water storage tank is configured to store the cleaning liquid.

17. A battery production line, characterized in that: The battery production line comprises the battery powder preparation system as described in any one of claims 1 to 16.

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