Slurry stirring equipment
By combining a dry mixing and dispersion device with a negative pressure conveying device, the problem of material adhesion in lithium-ion battery preparation was solved, achieving consistency of slurry and improving production efficiency.
Patent Information
- Application Number
- CN202422437443.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-10-09
AI Technical Summary
During the lithium-ion battery manufacturing process, the positive and negative electrode main materials and auxiliary materials are easily stuck to the damp stirring paddle or tank wall after automatic feeding, resulting in poor slurry consistency and affecting production efficiency.
The slurry is prepared by using a dry mixing and dispersion device and a negative pressure conveying device. The dry mixing and dispersion device first performs dry mixing, and the dry mixing agitator disperses the materials. Then, the negative pressure conveying device sends the mixed materials into the mixing tank for wet mixing, thus achieving the separation of dry mixing and wet mixing.
It effectively avoids or reduces the problem of materials sticking to the mixing paddle or tank wall, improves the consistency of the slurry, and increases production efficiency.
Smart Images
Figure CN223530322U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium-ion battery preparation technology, and more specifically, to a slurry mixing device. Background Technology
[0002] In the manufacturing process of lithium-ion batteries, the positive and negative electrode materials are typically dry-mixed with auxiliary materials using a dual planetary mixer, followed by the addition of solvent to prepare a slurry. The positive electrode material is typically lithium iron phosphate (LFP) or ternary materials, the negative electrode material is typically graphite or silicon carbide, and the auxiliary materials are typically polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), or carboxymethyl cellulose (CMC). After the prepared slurry is removed from the dual planetary mixer, the positive and negative electrode materials are added again for dry mixing, followed by the addition of solvent to prepare a new slurry, and this process is repeated cyclically.
[0003] During the preparation process, the positive and negative electrode main materials and auxiliary materials are very easy to stick to the damp stirring paddle or the damp tank wall after automatic feeding. In particular, the auxiliary materials (such as PVDF and CMC) have a high density and are more likely to stick to the damp stirring paddle or the damp tank wall after automatic feeding. Once the adhesion occurs, it is difficult to stir and disperse. Usually, it is necessary to stop the machine and manually scrape off the slurry adhering to the wall to ensure the consistency of the slurry. However, manual scraping has low production efficiency and affects the efficiency of continuous production. Utility Model Content
[0004] The purpose of this utility model is to provide a slurry mixing device to solve, to a certain extent, the technical problem in the prior art that the positive and negative electrode main materials and auxiliary materials are easily stuck to the damp mixing paddle and tank wall after automatic feeding, resulting in poor slurry consistency.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A slurry mixing device includes a dry mixing and dispersing device, a mixing device, and a negative pressure conveying device;
[0007] The dry mixing and dispersing device includes a dry mixing tank, a dry mixing driver, a dry mixing stirring shaft, and dry mixing stirring paddles; the dry mixing driver is connected to the dry mixing stirring shaft to drive the dry mixing stirring shaft to rotate; the dry mixing driver is located outside the dry mixing tank, the dry mixing stirring shaft passes through the dry mixing tank and extends into the interior of the dry mixing tank, and a plurality of the dry mixing stirring paddles are installed on the part of the dry mixing stirring shaft located inside the dry mixing tank;
[0008] The dry mixing tank is provided with a dry mixing vent, a dry mixing inlet, and a dry mixing outlet; the dry mixing inlet is located at the top or upper side wall of the dry mixing tank, and the dry mixing outlet is located at the bottom of the dry mixing tank.
[0009] The stirring device includes a stirring tank; the stirring tank is provided with a stirring inlet.
[0010] One end of the negative pressure conveying device is connected to the dry mixing outlet, and the other end is connected to the mixing inlet.
[0011] Optionally, in any of the above technical solutions, the dry mixing inlet includes a first inlet and a second inlet.
[0012] Optionally, in any of the above technical solutions, the dry mixing and dispersing device further includes a first breathing valve, which is connected to the top of the dry mixing tank.
[0013] And / or, the stirring device further includes a second breather valve connected to the top of the stirring tank.
[0014] Optionally, in any of the above technical solutions, the slurry mixing equipment further includes a first valve; the first valve is connected to the dry mixing vent and is used to connect to a nitrogen gas source.
[0015] Optionally, in any of the above technical solutions, the stirring device includes a weighing structure; the weighing structure is disposed at the bottom of the stirring tank.
[0016] Optionally, in any of the above technical solutions, the dry mixing dispersion device further includes a second valve; the second valve is connected to the dry mixing outlet and to the negative pressure conveying device.
[0017] Optionally, in any of the above technical solutions, the negative pressure conveying device includes a vacuum pump; the vacuum pump is configured to convey the material from the dry mixing outlet to the mixing inlet under negative pressure.
[0018] Optionally, in any of the above technical solutions, the stirring device is a double planetary mixer.
[0019] Optionally, in any of the above technical solutions, the inner wall smoothness of the dry mixing tank is not less than 300 mesh;
[0020] The dry mixing vent is located at the top or upper side wall of the dry mixing tank.
[0021] The number of dry mixing impellers is multiple, and the multiple dry mixing impellers are spaced apart along the axial direction of the dry mixing shaft.
[0022] The included angle between the blade portion of the dry mixing impeller and the axial direction of the dry mixing shaft is in the range of 30°-60°.
[0023] Optionally, in any of the above technical solutions, a sampling port is provided at the bottom of the dry mixing tank, and the sampling port is connected to a third valve.
[0024] The main beneficial effects of this utility model are as follows:
[0025] The slurry mixing equipment provided by this utility model includes a dry mixing and dispersing device, a mixing device, and a negative pressure conveying device. The dry mixing and dispersing device includes a dry mixing tank, a dry mixing driver, a dry mixing mixing shaft, and a dry mixing mixing paddle. The mixing device includes a mixing tank. Before feeding, the dry mixing vent on the dry mixing tank can be opened to inject nitrogen or inert gas to expel air from the dry mixing tank, ensuring the dryness of the environment inside the dry mixing tank and preventing powder from adhering to the walls due to internal moisture. Then, the material to be mixed is fed into the dry mixing inlet on the dry mixing tank. The dry mixing driver drives the dry mixing mixing shaft to rotate, which in turn drives the dry mixing mixing paddle to rotate to dry mix and disperse the material to be mixed. One end of the negative pressure conveying device is connected to the dry mixing outlet of the dry mixing tank, and the other end is connected to the mixing inlet of the mixing tank. The mixed material to be mixed in the dry mixing tank is then conveyed to the mixing tank under negative pressure, where it is wet-mixed with a solvent to prepare a slurry. The slurry mixing equipment first performs dry mixing through a dry mixing and dispersion device, and then performs wet mixing through a mixing device to prepare a slurry. That is, it adopts a dry mixing and wet mixing separation method, which has good dispersion performance and good consistency of slurry. It can effectively avoid or reduce the problem of materials to be mixed sticking to the mixing paddle or tank wall before dry mixing.
[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the slurry mixing equipment provided in an embodiment of the present utility model;
[0029] Figure 2 for Figure 1 The diagram shows the structure of the dry mixing and dispersing device.
[0030] Figure 3 for Figure 1 The diagram shows the structure of the stirring device.
[0031] Icons: 100-Dry mixing dispersion device; 110-Dry mixing tank; 111-Dry mixing vent; 112-Dry mixing inlet; 113-Dry mixing outlet; 114-First breather valve; 115-Sampling port; 116-Second valve; 118-First feed port; 119-Second feed port; 120-Dry mixing driver; 130-Dry mixing shaft; 140-Dry mixing impeller;
[0032] 200-Agitator; 210-Agitator tank; 211-Agitator inlet; 212-Second breather valve; 220-Weighing structure; 300-Negative pressure conveying device; 400-First valve; 500-Third valve. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0037] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0040] Example
[0041] This embodiment provides a slurry mixing device; it can be applied to the new energy industry and can be used for mixing and dispersing the main positive and negative electrode materials and auxiliary materials in the lithium-ion battery manufacturing process. It can solve the problem that the materials are easy to stick to the tank wall and the mixing paddle in the prior art, and can avoid manual scraping and cleaning, thus effectively improving production efficiency.
[0042] Please refer to Figures 1-3 The slurry mixing equipment described in this embodiment includes a dry mixing and dispersing device 100, a mixing device 200, and a negative pressure conveying device 300. The dry mixing and dispersing device 100 includes a dry mixing tank 110, a dry mixing driver 120, a dry mixing stirring shaft 130, and a dry mixing stirring paddle 140. The dry mixing driver 120 is connected to the dry mixing stirring shaft 130 to drive the dry mixing stirring shaft 130 to rotate. The dry mixing driver 120 is located outside the dry mixing tank 110, and the dry mixing stirring paddle 140 is located inside the dry mixing tank 110. The dry mixing stirring shaft 130 passes through the dry mixing tank 110 and extends into the interior of the dry mixing tank 110. Several dry mixing stirring paddles 140 are provided on the dry mixing stirring shaft 130. When the dry mixing driver 120 drives the dry mixing stirring shaft 130 to rotate, the dry mixing stirring paddles 140 rotate synchronously with the dry mixing stirring shaft 130. The rotation of the dry mixing stirring paddles 140 generates centrifugal force, shear force, and eddy current, so that materials of different densities can be mixed together uniformly.
[0043] The dry mixing tank 110 is equipped with a dry mixing vent 111, a dry mixing inlet 112, and a dry mixing outlet 113. The dry mixing inlet 112 is located at the top or upper side wall of the dry mixing tank 110, and the dry mixing outlet 113 is located at the bottom of the dry mixing tank 110. The dry mixing vent 111 allows gas, such as nitrogen, to be introduced before material feeding to expel air from the dry mixing tank 110, ensuring a dry environment inside the tank and preventing powder buildup due to internal moisture. Optionally, the dry mixing inlet 112 is located at the top of the dry mixing tank 110 to reduce contact between the material to be mixed and the inner wall of the dry mixing tank 110 or the dry mixing agitator shaft 130 during injection.
[0044] The mixing device 200 includes a mixing tank 210; the mixing tank 210 is provided with a mixing inlet 211. One end of the negative pressure conveying device 300 is connected to the dry mixture outlet 113, and the other end of the negative pressure conveying device 300 is connected to the mixing inlet 211. By using the negative pressure conveying device 300, moisture in the mixing tank 210 is prevented from flowing back into the dry mixing tank 110, thereby ensuring the dryness of the environment inside the dry mixing tank 110.
[0045] The slurry mixing equipment described in this embodiment includes a dry mixing and dispersing device 100, a mixing device 200, and a negative pressure conveying device 300. The dry mixing and dispersing device 100 includes a dry mixing tank 110, a dry mixing driver 120, a dry mixing mixing shaft 130, and a dry mixing mixing paddle 140. The mixing device 200 includes a mixing tank 210. Before feeding materials, the dry mixing vent 111 on the dry mixing tank 110 can be opened to inject nitrogen or inert gas, thereby expelling air from the dry mixing tank 110 and ensuring the dryness of the environment inside the dry mixing tank 110, preventing moisture buildup and potential defects. To prevent powder from adhering to the walls, the material to be mixed is added through the dry mixing inlet 112 on the dry mixing tank 110. The dry mixing drive 120 drives the dry mixing stirring shaft 130 to rotate, which in turn drives the dry mixing stirring paddle 140 to rotate for dry mixing and dispersion of the material. One end of the negative pressure conveying device 300 is connected to the dry mixing outlet 113 of the dry mixing tank 110, and the other end is connected to the stirring inlet 211 of the mixing tank 210. The mixed material in the dry mixing tank 110 is then negatively conveyed to the mixing tank 210 for wet mixing with the solvent to prepare a slurry. The slurry mixing equipment first performs dry mixing through the dry mixing dispersion device 100, and then performs wet mixing through the stirring device 200 to prepare a slurry. That is, it adopts a dry mixing and wet mixing separation method, which has better dispersion performance and better slurry consistency. It can effectively avoid or reduce the problem of the material to be mixed adhering to the stirring paddle or tank wall before dry mixing.
[0046] See Figure 1 and Figure 2As shown, in the optional embodiment, the dry mixing inlet 112 includes a first inlet 118 and a second inlet 119; for example, the first inlet 118 is the inlet for the main material, and the second inlet 119 is the inlet for the auxiliary material. The first inlet 118 and the second inlet 119 facilitate the control of the main material and the auxiliary material entering the dry mixing tank 110 respectively.
[0047] See Figure 1 and Figure 2 As shown, in an optional embodiment, the dry mixing and dispersing device 100 further includes a first breathing valve 114, which is connected to the top of the dry mixing tank 110. The first breathing valve 114 is used to maintain the pressure balance between the inside and outside of the dry mixing tank 110 and to prevent damage to the dry mixing tank 110 due to overpressure or vacuum.
[0048] See Figure 1 and Figure 3 As shown, in an optional embodiment, the stirring device 200 further includes a second breather valve 212, which is connected to the top of the stirring tank 210. The second breather valve 212 is used to maintain the pressure balance between the inside and outside of the stirring tank 210, preventing damage to the stirring tank 210 due to overpressure or vacuum.
[0049] See Figure 1 As shown, in an optional embodiment, the slurry mixing equipment further includes a first valve 400; the first valve 400 is connected to the dry mixing vent 111 and is used to connect to a nitrogen source. The first valve 400 is connected to the dry mixing tank 110 via the dry mixing vent 111, so that the nitrogen source can be controlled to supply gas to the dry mixing tank 110. Optionally, the first valve 400 is a pneumatic valve, an electric valve, or other type of valve.
[0050] See Figure 1 and Figure 3 As shown, in an optional embodiment, the stirring device 200 includes a weighing structure 220; the weighing structure 220 is disposed at the bottom of the stirring tank 210. The weighing structure 220 allows for monitoring the weight of the material inside the stirring tank 210.
[0051] See Figure 1 and Figure 2 As shown, in an optional embodiment, the dry mixing and dispersing device 100 further includes a second valve 116; the second valve 116 is connected to the dry mixing outlet 113 and is also connected to the negative pressure conveying device 300. The second valve 116 is connected to the dry mixing outlet 113 via the dry mixing tank 110 to control whether the material in the dry mixing tank 110 is output. Optionally, the second valve 116 is a pneumatic valve, an electric valve, or other type of valve.
[0052] In an optional embodiment, the negative pressure conveying device 300 includes a vacuum pump; the vacuum pump is configured to convey material from the dry mixing outlet 113 under negative pressure to the mixing inlet 211. For example, the negative pressure conveying device 300 also includes filters (e.g., polyester membrane filters, PE filters, 316L stainless steel filters, or titanium metal filters), compressed air backflushing devices, pneumatic discharge gate devices, stainless steel suction nozzles, conveying hoses, etc. In this embodiment, the negative pressure conveying device 300 can use existing products. When the negative pressure conveying device 300 is working, the vacuum pump generates negative pressure to form a vacuum airflow. The material is drawn in and forms a material-airflow, which passes through the pipes of the negative pressure conveying device 300 to the mixing tank 210 of the mixing device 200; the filter completely separates the material from the air. When the material reaches a set weight, the air supply to the vacuum pump is automatically cut off, and the vacuum pump stops working.
[0053] In this embodiment, the stirring device 200 can be an existing mixer, stirring structure, etc., for example, the stirring device 200 is a double planetary mixer.
[0054] In an optional embodiment, the dry mixing tank 110 is made of stainless steel or other materials.
[0055] In an optional embodiment, the mixing tank 210 is made of stainless steel or other materials.
[0056] In an optional embodiment, the dry mixing impeller 140 is made of stainless steel or other materials. Optionally, the surface of the dry mixing impeller 140 is coated with Teflon or other coatings.
[0057] In an optional embodiment, the inner wall finish of the dry mixing tank 110 is not less than 300 mesh; for example, the inner wall finish of the dry mixing tank 110 is 300 mesh, 500 mesh, etc. By using an inner wall finish of not less than 300 mesh for the dry mixing tank 110, the adhesion of the material to be mixed to the inner wall of the dry mixing tank 110 is reduced.
[0058] In an optional embodiment, the dry mixing vent 111 is located at the top or upper side wall of the dry mixing tank 110. The location of the dry mixing vent 111 at the top or upper side wall of the dry mixing tank 110 facilitates the discharge of air from the dry mixing tank 110, ensuring a dry environment inside the dry mixing tank 110 and preventing powder from adhering to the walls due to internal moisture.
[0059] In an optional embodiment, there are multiple dry mixing impellers 140, which are spaced apart along the axial direction of the dry mixing shaft 130. By having multiple dry mixing impellers 140 spaced apart along the axial direction of the dry mixing shaft 130, the dispersion and uniformity of the materials to be mixed in the dry mixing tank 110 can be improved to a certain extent.
[0060] In an optional embodiment, the angle between the blade of the dry mixing impeller 140 and the axial direction of the dry mixing shaft 130 is in the range of 30°-60°; for example, the angle between the blade of the dry mixing impeller 140 and the axial direction of the dry mixing shaft 130 is 30°, 40°, 55° or 60°; by having the angle between the blade of the dry mixing impeller 140 and the axial direction of the dry mixing shaft 130 be in the range of 30°-60°, it is beneficial to improve the dispersion and uniformity of the materials to be mixed in the dry mixing tank 110, and also beneficial to reduce energy consumption.
[0061] In an optional embodiment, the rotational speed of the dry mixing impeller 140 is 200 rpm / min to 300 rpm / min. For example, the rotational speed of the dry mixing impeller 140 is 200 rpm / min, 230 rpm / min, 275 rpm / min, or 300 rpm / min, or other values.
[0062] See Figure 2 As shown, in an optional embodiment, a sampling port 115 is provided at the bottom of the dry mixing tank 110, and a third valve 500 is connected to the sampling port 115. The sampling port 115 facilitates sampling from the dry mixing tank 110. The third valve 500 allows control over whether the dry mixing tank 110 is sampling. Optionally, the third valve 500 is a pneumatic valve, an electric valve, or another type of valve.
[0063] To better understand the slurry mixing equipment described in this embodiment, the specific usage method is briefly described below:
[0064] 1. Before feeding, open the first valve 400 connected to the dry mixing vent 111 and supply a certain amount of nitrogen or inert gas into the dry mixing tank 110, for example, supply 0.5m³ of nitrogen. 3 The air inside the dry mixing tank 110 is expelled to ensure a dry environment inside the dry mixing tank 110 and prevent powder from adhering to the walls due to internal moisture.
[0065] 2. Open the first feed port 118 to feed the main material. The main material will be automatically fed into the dry mixing tank 110 in a preset amount (for example, half of the total amount of main material to be fed); for example, the weight of the main material is fed according to the process setting amount, and the main material is fed into the dry mixing tank 110 by weighing in ton bags and gravity falling. The feeding accuracy of the main material is X±0.5kg.
[0066] 3. Open the second feed port 119 to add auxiliary materials. The auxiliary materials will be automatically added to the dry mixing tank 110. Optionally, the auxiliary materials can be added above the main materials and avoid contact with the inner wall of the dry mixing tank 110 and the dry mixing shaft 130.
[0067] 4. Following step 1, continue to add the remaining amount of main material (for example, half of the total amount of main material to be added) into the dry mixing tank 110 to completely cover the auxiliary materials.
[0068] 5. Start the dry mixing driver 120 to drive the dry mixing shaft 130 to rotate, thereby driving the dry mixing paddle 140 to rotate; for example, set the speed of the dry mixing paddle 140 to 200rpm-300rpm and the mixing time to 20min-30min, so that the main material and auxiliary material are evenly mixed, such that all auxiliary materials are evenly coated on the surface of the main material.
[0069] 6. The uniformly mixed material is conveyed under negative pressure. The second valve 116 is automatically opened and the negative pressure conveying device 300 conveys the material from the dry mixing outlet 113 of the dry mixing tank 110 to the mixing tank 210 through the mixing inlet 211, thus completing the dry mixing process.
[0070] 7. The mixing device 200 uses an automatic metering system to weigh the transferred materials. Once the weight is guaranteed to be the set value X ± 0.5 kg, the feeding will be started automatically, and the wet mixing process will be initiated.
[0071] The table below compares the slurry preparation time using an existing dual planetary mixer with that using the slurry mixing equipment described in this embodiment:
[0072]
[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A slurry mixing device, characterized in that, It includes a dry mixing and dispersing device (100), a stirring device (200), and a negative pressure conveying device (300). The dry mixing and dispersing device (100) includes a dry mixing tank (110), a dry mixing driver (120), a dry mixing stirring shaft (130), and dry mixing stirring paddles (140); the dry mixing driver (120) is connected to the dry mixing stirring shaft (130) to drive the dry mixing stirring shaft (130) to rotate; the dry mixing driver (120) is disposed outside the dry mixing tank (110), the dry mixing stirring shaft (130) passes through the dry mixing tank (110) and extends into the interior of the dry mixing tank (110), and a plurality of the dry mixing stirring paddles (140) are installed on the part of the dry mixing stirring shaft (130) located inside the dry mixing tank (110). The dry mixing tank (110) is provided with a dry mixing vent (111), a dry mixing inlet (112), and a dry mixing outlet (113); the dry mixing inlet (112) is located at the top or upper side wall of the dry mixing tank (110), and the dry mixing outlet (113) is located at the bottom of the dry mixing tank (110); The stirring device (200) includes a stirring tank (210); the stirring tank (210) is provided with a stirring inlet (211); One end of the negative pressure conveying device (300) is connected to the dry mixing outlet (113), and the other end is connected to the mixing inlet (211).
2. The slurry mixing equipment according to claim 1, characterized in that, The dry mix inlet (112) includes a first inlet (118) and a second inlet (119).
3. The slurry mixing equipment according to claim 1, characterized in that, The dry mixing and dispersing device (100) also includes a first breathing valve (114), which is connected to the top of the dry mixing tank (110); And / or, the stirring device (200) further includes a second breather valve (212) connected to the top of the stirring tank (210).
4. The slurry mixing equipment according to claim 1, characterized in that, The slurry mixing equipment also includes a first valve (400); the first valve (400) is connected to the dry mixing vent (111), and the first valve (400) is used to connect to a nitrogen gas source.
5. The slurry mixing equipment according to claim 1, characterized in that, The stirring device (200) includes a weighing structure (220); the weighing structure (220) is disposed at the bottom of the stirring tank (210).
6. The slurry mixing equipment according to claim 1, characterized in that, The dry mixing dispersion device (100) also includes a second valve (116); the second valve (116) is connected to the dry mixing outlet (113) and connected to the negative pressure conveying device (300).
7. The slurry mixing equipment according to claim 1, characterized in that, The negative pressure conveying device (300) includes a vacuum pump; the vacuum pump is configured to deliver material from the dry mix outlet (113) to the mixing inlet (211) under negative pressure.
8. The slurry mixing equipment according to claim 1, characterized in that, The stirring device (200) is a double planetary mixer.
9. The slurry mixing equipment according to claim 1, characterized in that, The dry mixing vent (111) is located on the top or upper side wall of the dry mixing tank (110); The number of the dry mixing impellers (140) is multiple, and the multiple dry mixing impellers (140) are spaced apart along the axial direction of the dry mixing shaft (130); The angle between the blade portion of the dry mixing impeller (140) and the axial direction of the dry mixing shaft (130) is in the range of 30°-60°.
10. The slurry mixing equipment according to claim 1, characterized in that, The bottom of the dry mixing tank (110) is provided with a sampling port (115), and the sampling port (115) is connected to a third valve (500).