Material mixing method and material mixing device
By using the mixing method in vacuum and low temperature environment in the dry electrode technology, the problems of poor uniformity and low stability of the powder mix are solved, and a more efficient mixing effect is achieved.
Patent Information
- Application Number
- CN202411663799.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-02-18
AI Technical Summary
In dry electrode technology, the mixing of the powder is poor in uniformity and low in stability, which leads to fibrosis and affects the electrode performance.
The mixture method in vacuum and low temperature environment is adopted, and the powder is dropped and mixed in a vacuum environment by vacuuming and cooling the powder at least one stage to avoid the viscosity of the solid binder.
It improves the uniformity and stability of the mixing material, reduces fibrosis, shortens the mixing time, and improves the mixing efficiency.
Smart Images
Figure CN119455737A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery manufacturing, and in particular to a material mixing method and a material mixing device. Background Art
[0002] Compared with wet electrode technology, dry electrode technology has many advantages, including lower cost, more environmentally friendly, higher energy density and better electrical performance, and is more suitable for large-scale production. On the one hand, this is because the binder solvent used in the wet process is toxic and unfriendly to the environment. On the other hand, the wet process requires baking, and a lot of energy is consumed when the solvent is recovered. Therefore, the dry process does not require solvents and reduces the baking and solvent recovery steps, so the process flow is simple, the equipment occupies a smaller area, and is more suitable for large-scale production of electrodes.
[0003] Dry electrode technology uses mixed electrode powder (e.g., including active materials, conductive agents, solid binders, etc.) to be sprayed or hot-pressed on the electrode to achieve the effect of combining the powder with the electrode. In related technologies, due to the large difference in particle sizes of different raw material particles in the powder, and the easy viscosity of the solid binder during the mixing process, fiberization occurs during the mixing process, resulting in poor uniformity of the mixed distribution, long mixing cycle, and low stability of the powder. Summary of the invention
[0004] In order to solve at least one of the above technical problems, the present application provides a mixing method and a mixing device, which can achieve mixing in a vacuum and low temperature environment and improve the uniformity and stability of the mixing. The technical solution adopted is as follows.
[0005] In the first aspect, the mixing method provided in the present application comprises:
[0006] Providing at least two powders to be mixed;
[0007] Passing the powder into the mixing device;
[0008] The mixing device is evacuated to allow the powder to fall and mix in a vacuum environment;
[0009] The powder is cooled in at least one of the above-mentioned stages.
[0010] In certain embodiments of the first aspect of the present application, after the material powder is introduced into the mixing device, the mixing method further comprises:
[0011] Apply airflow power to the mixing device to fluidize and mix the powder.
[0012] In certain embodiments of the first aspect of the present application, applying airflow power to the mixing device includes:
[0013] A cooling circulating airflow is applied to the mixing device to cool the powder.
[0014] In certain embodiments of the first aspect of the present application, applying airflow power to the mixing device includes:
[0015] Air is sucked out at the top of the mixing device, and air flow is introduced from the bottom of the mixing device to form a circulating air flow.
[0016] In certain embodiments of the first aspect of the present application, the mixing device comprises a mixing chamber, a lifting channel is provided in the mixing chamber, a channel outlet connected to the mixing chamber is provided at the top of the lifting channel, and a lifting screw is rotatably provided in the lifting channel;
[0017] The step of evacuating the mixing device so that the powdered materials fall and mix in a vacuum environment comprises:
[0018] Rotating the lifting screw to drive the powder to be lifted from bottom to top in the lifting channel and enter the mixing chamber through the channel outlet;
[0019] The powders fall and mix in the vacuum environment of the mixing chamber.
[0020] In certain embodiments of the first aspect of the present application, a material spreading plate is provided on the outer peripheral side of the lifting channel, and the material spreading plate is arranged below the channel outlet, and the material powder falls and is mixed in the vacuum environment of the mixing chamber, including:
[0021] The material spreading plate is rotated to disperse, stir and mix the powder in the falling process.
[0022] In certain embodiments of the first aspect of the present application, the step of introducing the powder into the mixing device comprises:
[0023] Feeding a first material powder into a first feeding port of the mixing device at a first speed;
[0024] A second material powder is introduced into the second feed inlet of the mixing device at a second speed;
[0025] The ratio of the first speed to the second speed is equal to the mixing ratio of the first material powder to the second material powder.
[0026] In certain embodiments of the first aspect of the present application, the step of introducing the powder into the mixing device comprises:
[0027] Rotate a material spreading plate in the mixing device, wherein the material spreading plate rotates to the second material receiving port after receiving material at the first material feeding port, so that the first material powder and the second material powder are mixed at the material spreading plate;
[0028] The scattering disc is rotated to allow the powder to fall from the scattering disc and be mixed.
[0029] In a second aspect, the present application further provides a mixing device, which is used to implement the mixing method provided in the first aspect, and the mixing device includes a shell, a cooling airflow power component and a vacuum component. A mixing chamber is formed in the shell, and a feed port connected to the mixing chamber is provided on the shell; the cooling airflow power component is connected to the mixing chamber to provide a cooling airflow to the mixing chamber; the vacuum component is connected to the mixing chamber to evacuate the mixing chamber.
[0030] In certain embodiments of the second aspect of the present application, the mixing device also includes a lifting channel arranged in the mixing chamber, a lifting screw is rotatably arranged in the lifting channel, a channel outlet connected to the mixing chamber is provided at the top of the lifting channel, a spreading plate is provided on the outer peripheral side of the lifting channel, the spreading plate is arranged below the channel outlet, and the spreading plate is rotatable relative to the lifting screw.
[0031] The embodiments of the present application have at least the following beneficial effects: on the one hand, by evacuating the mixing device, a vacuum mixing environment can be provided for the powder. Under vacuum conditions, powder particles of different particle sizes can fall and mix at the same speed in the mixing device, thereby improving the uniformity of the mixing, overcoming the problem of particle segregation during the falling mixing process due to differences in particle size and weight between the powders, improving the stability and uniformity of the mixing, shortening the mixing time, and improving the mixing efficiency. On the other hand, cooling the powder in at least one stage of the mixing process can provide a low-temperature environment for the powder, avoiding the solid binder from becoming sticky at high temperatures, causing the powder particles to agglomerate or produce fiberization, thereby achieving the effect of non-fiberized mixing and improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easy to understand in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0033] Figure 1 A flow chart of a mixing method provided in an embodiment of the present application;
[0034] Figure 2 A schematic diagram of the structure of a mixing device provided in an embodiment of the present application;
[0035] Figure 3 for Figure 2 AA section view;
[0036] Figure 4 A top view of a mixing device provided in an embodiment of the present application.
[0037] Reference numerals:
[0038] 100, mixing device; 10, housing; 11, mixing chamber; 20, cooling airflow power assembly; 31, lifting screw; 321, lifting channel; 322, channel outlet; 41, spreading plate; 51, first feed inlet; 52, second feed inlet. DETAILED DESCRIPTION
[0039] Combine the following Figures 1 to 4 Embodiments of the present application are described in detail, and examples of the embodiments 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 application, and cannot be understood as limiting the present application.
[0040] In the description of the present application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 application. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.
[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 this application can be understood according to specific circumstances.
[0042] In the dry battery mixing process, the powder to be mixed may include active materials of the positive or negative electrode, conductive agents, solid binders, etc. For example, the active materials and conductive agents are usually inorganic particles with smaller particle sizes, and the particle size order of magnitude is usually around 10 μm, while the solid binder may be PTFE (polytetrafluoroethylene), and its particle size order of magnitude is usually around 500 μm. It can be seen that the particle sizes of different powder particles are very different, so the mechanical properties of different powders in the mixing process are very different. Powders with large particle sizes are usually easy to deposit at the bottom, while particles with small particle sizes remain on the surface, resulting in uneven mixing. At the same time, solid binders have the characteristic of being easy to produce viscosity under high temperature conditions, which causes the powder to easily bond into agglomerates during the mixing process, resulting in fiberization, which is not conducive to achieving a uniform mixing effect.
[0043] Based on this, first of all, please refer to Figures 1 to 3 , the present application provides a mixing method, comprising:
[0044] S100. Providing at least two powders to be mixed;
[0045] S200. The powder is introduced into the mixing device 100;
[0046] S300. The mixing device 100 is evacuated so that the powder falls and mixes in a vacuum environment;
[0047] The powder is cooled in at least one of the above-mentioned stages.
[0048] By using the mixing method provided by the present application, on the one hand, by evacuating the mixing device 100, a vacuum mixing environment can be provided for the powder. Under vacuum conditions, powder particles of different particle sizes can fall and mix at the same speed in the mixing device 100, thereby improving the uniformity of the mixing, overcoming the problem of particle segregation during the falling mixing process due to differences in particle size and weight between the powders, improving the stability and uniformity of the mixing, shortening the mixing time, and improving the mixing efficiency. On the other hand, cooling the powder in at least one stage of the mixing process can provide a low-temperature environment for the powder, avoiding the solid binder from becoming sticky at high temperatures, causing the powder particles to agglomerate or produce fiberization, thereby achieving the effect of non-fiberized mixing and improving the mixing effect.
[0049] In some embodiments, in order to further improve the uniformity of mixing, after the above step S200 of introducing the powder into the mixing device 100, the mixing method further includes:
[0050] S400. Apply airflow power to the mixing device 100 to fluidize and mix the powder.
[0051] By applying airflow power to the mixing device 100, the powder can be gasified, that is, through the driving effect of high-pressure gas, the powder can flow rapidly in the mixing device 100 in the form of airflow, and the effect of mixing different powder particles can be achieved during the flow. The use of the gasification mixing method can achieve continuous and rapid stirring of the powder and improve the uniformity of the mixing. On the other hand, the powder can be driven by the airflow to reduce the loss of the powder and improve the mixing effect.
[0052] In some embodiments, the above step S400 of applying airflow power to the mixing device 100 includes:
[0053] S410. Apply cooling circulating airflow to the mixing device 100 to cool the material powder.
[0054] By applying cooling circulating airflow, on the one hand, it can provide airflow power for the fluidization and mixing of the powder, and on the other hand, the airflow power can also cool the powder, so that the solid binder can be prevented from becoming sticky under high temperature, thereby overcoming the problem of fiberization during the mixing process, and preventing the solid binder from bonding with other powder particles to form a mass, thereby improving the uniformity of the mixing and ensuring that the properties of the mixed powder can meet the process requirements. The airflow power adopts the circulating airflow method to achieve the continuous mixing of the powder and the continuous cooling effect, thereby improving the efficiency of the mixing.
[0055] Exemplarily, the cooling circulating gas flow can be low-temperature nitrogen, carbon dioxide or other inert gases that do not react with the powder, which are not limited here. Optionally, since PTFE will become sticky under conditions above 19°C, the temperature of the cooling circulating gas flow can be set to be lower than 19°C, thereby playing a role in cooling the powder and avoiding fiberization during the mixing process.
[0056] Optionally, a cooling circulating airflow is applied to the mixing device 100 until the powder in the mixing device 100 is cooled to a target temperature (e.g., 19° C.), and then the cooling of the circulating airflow can be stopped, or the introduction of the cooling circulating airflow can be stopped, and then step S300 is performed. The detection of the powder temperature can be achieved by using a temperature sensor disposed in the mixing device 100, which is not limited here.
[0057] As an alternative embodiment, the powder can be cooled without using a cooling circulating airflow. Instead, the powder can be cooled separately before loading, or the mixing device 100 itself can be cooled to achieve the cooling effect on the powder. This is not limited here.
[0058] In some embodiments, the above step S400 of applying airflow power to the mixing device 100 includes:
[0059] S420. Vacuum the top of the mixing device 100 and introduce air flow from the bottom of the mixing device 100 to form a circulating air flow.
[0060] By providing a circulating airflow by taking in air at the bottom of the mixing device 100 and exhausting air at the top, an airflow direction from bottom to top can be formed in the mixing device 100, which helps to lift the powder from the bottom of the mixing device 100 to the top by the airflow, so that the powder can start to fall from the top of the mixing device 100, thereby providing a sufficient falling stroke for the powder during the falling and mixing process, making full use of the space in the mixing device 100, and improving the mixing effect.
[0061] In some embodiments, the mixing device 100 includes a mixing chamber 11, a lifting channel 321 is provided in the mixing chamber 11, a channel outlet 322 connected to the mixing chamber 11 is provided at the top of the lifting channel 321, and a lifting screw 31 is rotatably provided in the lifting channel 321; the above step S300. evacuating the mixing device 100 so that the powder falls and mixes in a vacuum environment includes:
[0062] S310. Rotate the lifting screw 31 to drive the powder to be lifted from bottom to top in the lifting channel 321 and enter the mixing chamber 11 through the channel outlet 322;
[0063] S320. The powder falls and is mixed in the vacuum environment of the mixing chamber 11.
[0064] When the mixing device 100 is evacuated, the airflow power is stopped in the mixing device 100. At this time, the powder can be lifted from the bottom of the mixing device 100 to the top through the lifting channel 321 by means of the lifting action of the lifting screw 31, and the powder is sprinkled into the mixing chamber 11 through the channel outlet 322 by means of the centrifugal action of the lifting screw 31. The powder can fall from the top of the mixing chamber 11. Since the inside of the mixing device 100 is evacuated, the powder falls under vacuum conditions, which can reduce or eliminate the difference in falling speed between powder particles of different particle sizes, so that powder particles of different particle sizes fall and mix at approximately the same speed, avoiding the phenomenon that large particles fall fast and small particles fall slowly, overcoming the segregation problem between particles of different particle sizes, thereby improving the distribution uniformity and stability of the mixture. By providing the lifting channel 321, isolation from the mixing chamber 11 can be achieved, that is, the powder moves upward through the lifting channel 321 and falls through the mixing chamber 11 for mixing. In this way, the powders in the lifting channel 321 and in the mixing chamber 11 can move independently without affecting each other, thereby improving the orderliness of the powder mixing process and ensuring that the powders falling in the mixing chamber 11 can be fully mixed.
[0065] Exemplarily, the vacuum degree in the mixing chamber 11 may be about 0.8 times the standard atmospheric pressure. Under this vacuum degree condition, the uniform mixing requirement of the powder particles can be met, and the strength of the mixing device 100 can also meet the vacuum degree requirement.
[0066] In some embodiments, a material spreading plate 41 is provided on the outer peripheral side of the lifting channel 321, and the material spreading plate 41 is arranged below the channel outlet 322. The above step S320. The material powder falls and mixes in the vacuum environment of the mixing chamber 11 includes:
[0067] S321. Rotate the material spreading plate 41 to disperse and mix the powder in the falling process.
[0068] By utilizing the rotation of the spreading disc 41, on the one hand, the powder can be guided to diffuse and move from the lifting channel 321 to the periphery, and on the other hand, the powder sprinkled from the channel outlet 322 can be further stirred and dispersed, thereby improving the uniformity and stability of the powder during the mixing process, shortening the mixing time, and thus improving the mixing efficiency.
[0069] In some embodiments, the above step S200 of introducing the powder into the mixing device 100 includes:
[0070] S210. A first material powder is introduced into the first feed port 51 of the mixing device 100 at a first speed;
[0071] S220. A second material powder is introduced into the second feed port 52 of the mixing device 100 at a second speed;
[0072] The ratio of the first speed to the second speed is equal to the mixing ratio of the first material powder to the second material powder.
[0073] By controlling the feeding speed of the first material powder and the second material powder, the two material powders can be fed evenly in the required proportion, and the feeding ratio of the two material powders can be maintained at the same level as the target mixing ratio per unit time, thereby improving the mixing efficiency, achieving the effect of evenly mixing the two material powders, and improving the uniformity and stability of the mixing.
[0074] Optionally, see Figure 4 The powders to be mixed may not be limited to two types, for example, there may be three, four or more types, the number of feed ports may be three, four, etc. according to the mixing requirements, and the plurality of feed structures 50 may be arranged at equal intervals along the circumference of the housing 10. Alternatively, when the number of feed ports is less than the number of powder types, different powders may be introduced in batches, and the feed speed ratio of different powders in the same batch is the same as the mixing ratio of the powders.
[0075] In some embodiments, the above step S200 of introducing the powder into the mixing device 100 includes:
[0076] S230. Rotate the material spreading plate 41 in the mixing device 100, and rotate the material spreading plate 41 to the second material receiving port after receiving the material at the first feeding port 51, so that the first material powder and the second material powder are mixed in the material spreading plate 41;
[0077] S240. Rotate the material spreading plate 41 so that the powder is sprinkled from the material spreading plate 41 and mixed.
[0078] By setting the material spreading disc 41 to rotate and coordinating the feeding actions of the first feeding port 51 and the second feeding port 52, the material spreading disc 41 can be used to sequentially receive and mix the material powders of the two feeding ports. In this way, the material powders can be preliminarily mixed during the feeding process, and then the mixing effect can be achieved by subsequent processes such as low-temperature gasification mixing and mixing under vacuum conditions. The preliminary mixing of the material powders helps to further improve the mixing effect, and helps to shorten the subsequent mixing process and improve the mixing efficiency.
[0079] For the second aspect, please refer to 2 to Figure 4 The present application also provides a mixing device 100, which is used to implement the mixing method provided in the first aspect. The mixing device 100 includes a housing 10, a cooling airflow power component 20, and a vacuum component. A mixing chamber 11 is formed in the housing 10, and a feed port connected to the mixing chamber 11 is provided on the housing 10. The cooling airflow power component 20 is connected to the mixing chamber 11 and is used to provide a cooling airflow to the mixing chamber 11. The vacuum component is connected to the mixing chamber 11 and is used to evacuate the mixing chamber 11.
[0080] By using the cooling airflow power component 20, on the one hand, it is possible to provide airflow power for the fluidization and mixing of the powder, so that the powder can flow rapidly in the form of airflow under the impetus of high-pressure gas, and achieve the effect of mixing different powder particles during the flow process. On the other hand, the airflow power can also cool the powder, prevent the solid binder from becoming sticky under the action of high temperature, thereby overcoming the problem of fiberization during the mixing process, and preventing the solid binder from bonding to other powder particles to form a mass, so as to achieve the effect of non-fiberized mixing, thereby improving the uniformity of the mixing, and ensuring that the properties of the mixed powder can meet the process requirements. By evacuating the mixing device 100 through the vacuum component, a vacuum mixing environment can be provided for the powder. Under vacuum conditions, powder particles of different particle sizes can fall and mix at the same speed in the mixing device 100, thereby improving the uniformity of the mixing, overcoming the problem of particle segregation in the falling mixing process due to differences in particle size and weight between the powders, improving the stability and uniformity of the mixing, shortening the mixing time, and improving the mixing efficiency.
[0081] In some embodiments, the mixing device 100 also includes a lifting channel 321 arranged in the mixing chamber 11, a lifting screw 31 is rotatably arranged in the lifting channel 321, a channel outlet 322 connected to the mixing chamber 11 is provided at the top of the lifting channel 321, and a spreading plate 41 is provided on the outer peripheral side of the lifting channel 321. The spreading plate 41 is arranged below the channel outlet 322, and the spreading plate 41 is rotatable relative to the lifting screw 31.
[0082] With the help of the lifting action of the lifting screw 31, the powder can be lifted from the bottom of the mixing device 100 to the top through the lifting channel 321, and the powder can be sprinkled into the mixing chamber 11 through the channel outlet 322 by utilizing the centrifugal action of the lifting screw 31. The powder can fall from the top of the mixing chamber 11. Since the inside of the mixing device 100 is evacuated, the powder falls under vacuum conditions, which can reduce or eliminate the difference in falling speed between powder particles of different particle sizes, so that powder particles of different particle sizes fall and mix at approximately the same speed, avoiding the phenomenon that large particles fall fast and small particles fall slowly, and overcoming the segregation problem between particles of different particle sizes, thereby improving the distribution uniformity and stability of the mixture. By providing the lifting channel 321, isolation from the mixing chamber 11 can be achieved, that is, the powder moves upward through the lifting channel 321 and falls through the mixing chamber 11 for mixing. In this way, the powders in the lifting channel 321 and in the mixing chamber 11 can move independently without affecting each other, thereby improving the orderliness of the powder mixing process and ensuring that the powders falling in the mixing chamber 11 can be fully mixed.
[0083] By utilizing the rotation of the spreading disc 41, on the one hand, the powder can be guided to diffuse and move from the lifting channel 321 to the periphery, and on the other hand, the powder sprinkled from the channel outlet 322 can be further stirred and dispersed, thereby improving the uniformity and stability of the powder during the mixing process, shortening the mixing time, and thus improving the mixing efficiency.
[0084] Optionally, the rotation directions of the scattering disc 41 and the lifting screw 31 can be opposite, so that when the powder is sprinkled from the channel outlet 322, it has an initial velocity along the rotation direction of the lifting screw 31. When the powder contacts the scattering disc 41, since the rotation direction of the scattering disc 41 is opposite to the rotation direction of the lifting screw 31, the rotation speed of the powder relative to the scattering disc 41 is the superposition of the initial velocity of the powder itself and the rotation speed of the scattering disc 41, thereby enhancing the dispersing effect of the scattering disc 41 on the powder, helping to improve the dispersing and stirring effect of the scattering disc 41 on the powder, thereby improving the mixing effect.
[0085] In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it 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 application. 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.
[0086] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.
[0087] In the description of this application, if "," appears in the patent name, it means an "and" relationship, not an "or" relationship. For example, if the patent name is "a kind of A, B", it means that the content required to be protected by this application is: the technical solution with the subject name A and the technical solution with the subject name B.
Claims
1. A mixing method, characterized in that: include Providing at least two powders to be mixed; Passing the powder into the mixing device; The mixing device is evacuated to allow the powder to fall and mix in a vacuum environment; The powder is cooled in at least one of the above-mentioned stages.
2. The mixing method according to claim 1, characterized in that: After the material powder is introduced into the mixing device, the mixing method further comprises: Apply airflow power to the mixing device to fluidize and mix the powder.
3. The mixing method according to claim 2, characterized in that: Applying airflow power to the mixing device includes: A cooling circulating airflow is applied to the mixing device to cool the powder.
4. The mixing method according to claim 2 or 3, characterized in that: Applying airflow power to the mixing device includes: Air is sucked out at the top of the mixing device, and air flow is introduced from the bottom of the mixing device to form a circulating air flow.
5. The mixing method according to any one of claims 1 to 3, characterized in that: The mixing device comprises a mixing chamber, a lifting channel is provided in the mixing chamber, a channel outlet connected to the mixing chamber is provided at the top of the lifting channel, and a lifting screw is rotatably provided in the lifting channel; The step of evacuating the mixing device so that the powdered materials fall and mix in a vacuum environment comprises: Rotating the lifting screw to drive the powder to be lifted from bottom to top in the lifting channel and enter the mixing chamber through the channel outlet; The powders fall and mix in the vacuum environment of the mixing chamber.
6. The mixing method according to claim 5, characterized in that: The outer peripheral side of the lifting channel is provided with a material spreading plate, and the material spreading plate is arranged below the channel outlet, and the material powder falls and mixes in the vacuum environment of the mixing chamber, including: The material spreading plate is rotated to disperse, stir and mix the powder in the falling process.
7. The mixing method according to any one of claims 1 to 3, characterized in that: The step of introducing the powder into the mixing device comprises: Feeding a first material powder into a first feeding port of the mixing device at a first speed; A second material powder is introduced into the second feed inlet of the mixing device at a second speed; The ratio of the first speed to the second speed is equal to the mixing ratio of the first material powder to the second material powder.
8. The mixing method according to claim 7, characterized in that: The step of introducing the powder into the mixing device comprises: Rotate a material spreading plate in the mixing device, wherein the material spreading plate rotates to the second material feeding port after receiving material at the first material feeding port, so that the first material powder and the second material powder are mixed at the material spreading plate; The scattering disc is rotated to allow the powder to fall from the scattering disc and be mixed.
9. A mixing device, characterized in that: The mixing device is used to implement the mixing method according to any one of claims 1 to 8, and the mixing device comprises: A shell body, wherein a mixing cavity is formed in the shell body, and a feeding port communicating with the mixing cavity is provided on the shell body; A cooling airflow power component is connected to the mixing chamber and is used to provide a cooling airflow to the mixing chamber; The vacuum component is connected to the mixing chamber and is used for evacuating the mixing chamber.
10. The mixing device according to claim 9, characterized in that: The mixing device also includes a lifting channel arranged in the mixing chamber, a lifting screw is rotatably arranged in the lifting channel, a channel outlet connected to the mixing chamber is arranged at the top of the lifting channel, a spreading plate is arranged on the outer peripheral side of the lifting channel, the spreading plate is arranged below the channel outlet, and the spreading plate is rotatable relative to the lifting screw.
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