Stirrer for improving uniform dispersion of nano silicon in silicon-carbon negative electrode material

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a stirrer for improving the uniform dispersion of nano silicon in a silicon-carbon negative electrode material, which comprises an outer shell, an inner shell, a support assembly, a stirring assembly I, a stirring assembly II and a slag discharge pipe, the inner shell is fixedly installed in the outer shell and located on the same vertical axis, the first stirring assembly is arranged in the inner shell and connected with the outer shell, the second stirring assembly is arranged in the inner shell and connected with the first stirring assembly, and the bottom of the inner shell and the bottom of the outer shell are both arranged in a spherical surface mode. The stirring device is reasonable in design, has the characteristics of convenience in operation, high efficiency, good stability and the like, and can improve the stirring efficiency and effect of dispersion liquid of nano silicon and graphite particles, so that the dispersion liquid can be quickly and uniformly dispersed, the problem of uniform dispersion of the nano silicon in a silicon-carbon negative electrode material is effectively solved, and the performance and the consistency of a lithium ion battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, and particularly relates to a stirrer for improving the uniform dispersion of nano - silicon in silicon - carbon anode materials. Background Technique

[0002] In the field of lithium - ion batteries, silicon - carbon anode materials have attracted much attention due to their high energy density. When processing carbon - silicon materials, nano - silicon and graphite need to be premixed in a dispersion liquid and stirred and mixed during the ball - milling process. Usually, a stirrer is used for the stirring operation.

[0003] Referring to the "stirrer for improving the uniform dispersion of nano - silicon in silicon - carbon anode materials" with the authorized announcement number CN 217473294 U, during the stirring process, ultrasonic waves are introduced and double - layer stirring rods are used for stirring, which promotes a more uniform mixing of nano - silicon and graphite. The introduction of ultrasonic waves further promotes the dispersion of graphite and prevents the agglomeration of graphite particles, thereby improving the uniformity of the nano - silicon and graphite compounding and the consistency of the silicon - carbon anode material, and solving the problems of uneven mixing of nano - silicon and graphite and easy graphite agglomeration during the processing.

[0004] The utility model provides another solution to solve the above problems.

[0005] The information disclosed in this background - technology section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the utility model is to solve the disadvantages mentioned in the above background technology, and to provide a stirrer for improving the uniform dispersion of nano - silicon in silicon - carbon anode materials.

[0007] The above - mentioned technical purpose of the utility model is achieved through the following technical solutions: A stirrer for improving the uniform dispersion of nano - silicon in silicon - carbon anode materials, comprising an outer shell, an inner shell, a support assembly, a first stirring assembly, a second stirring assembly, and a slag discharge pipe;

[0008] The inner shell is fixedly installed inside the outer shell and located on the same vertical axis. The first stirring assembly is arranged inside the inner shell and connected to the outer shell. The second stirring assembly is arranged inside the inner shell and connected to the first stirring assembly. The bottoms of the inner shell and the outer shell are both spherical, and a plurality of through holes are formed at the bottom side of the inner shell, and all the through holes are located directly below the first stirring assembly. A plurality of mounting holes are formed in the side wall of the inner shell, and a nozzle is fixedly installed in each of the plurality of mounting holes, and all the nozzles face the second stirring assembly. The supporting assembly is arranged on the outer shell. The slag discharge pipe is fixedly installed at the lowest point of the bottom of the outer shell. The top and bottom of the outer shell are respectively fixedly installed with a feed pipe and a plurality of discharge pipes, and the bottom end of the feed pipe extends into the inner shell.

[0009] Preferably, the first stirring assembly includes a motor, a rotating shaft and a plurality of strip plates. The motor is fixedly installed at the top of the outer shell, the output shaft of the motor is axially fixedly installed with the rotating shaft, the bottom end of the rotating shaft extends into the inner shell and is radially fixedly installed with a plurality of strip plates, and all the strip plates are arranged obliquely.

[0010] Preferably, the second stirring assembly includes a support frame, a plurality of rotating rods, a plurality of gears, a toothed disc and a plurality of baffles. The support frame is radially fixedly installed on the rotating shaft, a plurality of rotating rods parallel to the rotating shaft are rotatably installed on the support frame, a plurality of baffles are fixedly installed on all the rotating rods, a gear is fixedly sleeved at the top end of all the rotating rods, and the toothed disc is fixedly installed on the inner wall of the top of the inner shell, and all the gears are meshed with the toothed disc.

[0011] Preferably, a plurality of vertically arranged stirring rods are fixedly installed on the strip plates.

[0012] Preferably, a filter plate adapted to the plurality of discharge pipes is fixedly installed on the inner wall of the bottom of the outer shell by means of embedding.

[0013] Preferably, a scraping bar in an arc shape is fixedly installed at the bottom end of the rotating shaft, and the scraping bar is in movable contact with the inner wall of the bottom of the outer shell and the top side of the filter plate.

[0014] Preferably, a fixing ring is fixedly installed on the outer side of the inner shell, and the outer side of the fixing ring is fixedly connected to the inner side wall of the outer shell.

[0015] Preferably, the supporting assembly includes a supporting ring and a plurality of supporting legs. The supporting ring is fixedly installed on the outer side of the outer shell, and a plurality of supporting legs are fixedly installed on the bottom side of the supporting ring.

[0016] Preferably, a hopper is fixedly installed at the top end of the feed pipe.

[0017] The beneficial effects of the utility model are:

[0018] Through the spherical bottom design of the inner shell and the outer shell, the full flow and mixing of the materials during the stirring process are ensured, the dead corner area is reduced, thereby improving the dispersion uniformity of the nano-silicon and graphite particles. At the same time, through the arrangement of the strip plate and the stirring rod in the first stirring component, the materials in the inner shell are subjected to more effective shearing and stirring effects, further promoting the uniform dispersion of the nano-silicon and graphite particles, and applying a downward force to the dispersion liquid of the stirred nano-silicon and graphite particles, so that it can enter the position between the inner shell and the outer shell along the through hole, and then flow back into the inner shell from multiple nozzle positions. Through the combination of the rotating rod and the baffle in the second stirring component and the meshing with the gear disk, an efficient stirring motion is achieved, including revolution and rotation, so as to apply shear force to the materials in different directions, enhance the mixing effect, and at the same time be able to produce a strong impact and stirring effect on the dispersion liquid of the nano-silicon and graphite particles ejected from the nozzle, which helps the rapid and uniform mixing of the nano-silicon and graphite particles.

[0019] Through the embedded installation of the filter plate and the design of the scraping strip, the filtration of the materials during discharging and the self-cleaning of the filter plate are ensured, avoiding clogging phenomena, improving the production efficiency and the continuous operation ability of the equipment. At the same time, through the setting of the support component, stable support can be provided for the device, and through the set fixing ring, the relative stability between the inner shell and the outer shell can be guaranteed, thus ensuring the stability and reliability during the stirring process. And the design of the feed pipe and the hopper facilitates the addition of materials and the uniform distribution into the stirrer, improving the convenience and efficiency of operation.

[0020] In summary, the present utility model provides a stirrer with reasonable structure and remarkable stirring effect, which can effectively solve the problem of uniform dispersion of nano-silicon in the silicon-carbon negative electrode material, thereby improving the performance and consistency of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a three-dimensional structure schematic diagram of a stirrer for improving the uniform dispersion of nano-silicon in the silicon-carbon negative electrode material proposed by the present utility model;

[0023] Figure 2 It is a cross-sectional structure schematic diagram of a stirrer for improving the uniform dispersion of nano-silicon in the silicon-carbon negative electrode material proposed by the present utility model;

[0024] Figure 3 It isFigure 2 Front view structural schematic diagram;

[0025] Figure 4 Partial three-dimensional structural schematic diagram of a stirrer for improving the uniform dispersion of nano-silicon in silicon-carbon anode materials proposed by the present utility model;

[0026] Figure 5 Three-dimensional structural schematic diagram of the inner housing, through holes and mounting holes proposed by the present utility model.

[0027] In the figure: 1. Outer housing; 11. Support ring; 12. Support leg; 2. Inner housing; 21. Feed pipe; 22. Nozzle; 23. Through hole; 3. Slag discharge pipe; 31. Discharge pipe; 32. Filter plate; 4. Rotating shaft; 401. Scraping bar; 41. Motor; 42. Support frame; 43. Rotating rod; 431. Baffle; 44. Gear; 45. Tooth disc; 5. Strip-shaped plate; 51. Stirring rod. Specific embodiments

[0028] The technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] Referring to Figures 1-5 , a stirrer for improving the uniform dispersion of nano-silicon in silicon-carbon anode materials, comprising an outer housing 1, an inner housing 2 and a slag discharge pipe 3. The inner housing 2 is fixedly installed inside the outer housing 1 and is located on the same vertical axis. A plurality of through holes 23 are opened at the bottom side position of the inner housing 2. A motor 41 is fixedly installed at the top of the outer housing 1. A rotating shaft 4 is axially fixedly installed on the output shaft of the motor 41. The bottom end of the rotating shaft 4 extends into the inner housing 2 and a plurality of strip-shaped plates 5 are radially fixedly installed. The plurality of strip-shaped plates 5 are all arranged obliquely. The plurality of through holes 23 are located directly below the area covered by the plurality of strip-shaped plates 5, and can stir the dispersion liquid of nano-silicon and graphite particles in the inner housing 2, and at the same time can apply a downward force thereto, so that the dispersion liquid of nano-silicon and graphite particles can enter the position between the inner housing 2 and the outer housing 1 through the through holes 23. A plurality of mounting holes are opened on the side wall of the inner housing 2, and a nozzle 22 is fixedly installed in each of the plurality of mounting holes;

[0030] A support frame 42 is radially and fixedly installed on the rotating shaft 4. A plurality of rotating rods 43 parallel to the rotating shaft 4 are rotatably installed on the support frame 42. A plurality of baffles 431 are fixedly installed on the plurality of rotating rods 43. Gear discs 44 are fixedly sleeved on the tops of the plurality of rotating rods 43. A toothed disc 45 is fixedly installed on the inner wall of the top of the inner housing 2. The plurality of gear discs 44 are all meshed with the toothed disc 45, which can control the plurality of rotating rods 43 to revolve around the rotating shaft 4 as the center and rotate simultaneously when the rotating shaft 4 rotates, so as to improve the stirring effect. At the same time, it can strike the dispersion liquid of nano-silicon and graphite particles ejected by the nozzle 22, so that the dispersion liquid of nano-silicon and graphite particles can be more quickly and evenly mixed. The bottoms of the inner housing 2 and the outer housing 1 are both spherical, ensuring the full flow and mixing of the materials during the stirring process, reducing the dead angle area, thereby improving the dispersion uniformity of nano-silicon and graphite particles. A support ring 11 is fixedly installed on the outside of the outer housing 1, and a plurality of support legs 12 are fixedly installed on the bottom side of the support ring 11, which can provide stable support for the device. The slag discharge pipe 3 is fixedly installed at the lowest point of the bottom of the outer housing 1. The top and bottom of the outer housing 1 are respectively fixedly installed with a feed pipe 21 and a plurality of discharge pipes 31, and the bottom end of the feed pipe 21 extends into the inner housing 2.

[0031] In this embodiment, in order to further improve the stirring effect, a plurality of stirring rods 51 arranged vertically are fixedly installed on the strip-shaped plate 5.

[0032] In this embodiment, in order to filter the discharged materials during discharging, a filter plate 32 adapted to the plurality of discharge pipes 31 is fixedly installed on the inner wall of the bottom of the outer housing 1 by means of embedding.

[0033] In this embodiment, in order to realize the self-cleaning operation of the filter plate 32, so as to avoid the situation of blockage of the filter plate 32, a scraping strip 401 arranged in an arc shape is fixedly installed at the bottom end of the rotating shaft 4, and the scraping strip 401 is in movable contact with the inner wall of the bottom of the outer housing 1 and the top side of the filter plate 32.

[0034] In this embodiment, in order to ensure the relative stability between the inner housing 2 and the outer housing 1, a fixing ring is fixedly installed on the outside of the inner housing 2, and the outside of the fixing ring is fixedly connected to the inner side wall of the outer housing 1.

[0035] In this embodiment, in order to facilitate the filling of the materials to be stirred into the feed pipe 21, a hopper is fixedly installed at the top end of the feed pipe 21.

[0036] Working principle: When in use, first turn on the power supply and start the motor 41. The motor 41 controls the rotation of the rotating shaft 4, which can drive the strip plate 5 and the rotating rod 43 to rotate synchronously around the rotating shaft 4. The strip plate 5 generates a strong stirring effect inside the inner shell 2, enabling the dispersion liquid of nano-silicon and graphite particles to be fully mixed inside the inner shell 2. At the same time, since the strip plate 5 is inclined, the strip plate 5 can apply a downward force to the material while performing the stirring operation, so that the material can enter the position between the inner shell 2 and the outer shell 1 through the through hole 23, thereby achieving a wider mixing range. Under the continuous action of the strip plate 5, the material flows back into the inner shell 2 from multiple nozzles 22. At the same time, the baffle 431 on the rotating rod 43 strikes the dispersion liquid ejected from the nozzle 22 during the rotation process, further promoting the uniform dispersion of nano-silicon and graphite particles. The spherical design of the bottoms of the inner shell 2 and the outer shell 1 ensures the full flow and mixing of the material during the stirring process, reduces the dead angle area, and further improves the dispersion uniformity.

[0037] During the stirring process, if new material needs to be added, the material can be added into the inner shell 2 through the feed pipe 21. Since a hopper is fixedly installed at the top end of the feed pipe 21, it is more convenient to add and evenly distribute the material. After the stirring is completed, the uniformly mixed material can be discharged through the discharge pipe 31. In order to ensure that the discharged material does not contain large particle impurities, a filter plate 32 is fixedly installed in an embedded manner on the bottom inner wall of the outer shell 1 and is adapted to the discharge pipe 31 to achieve the filtering operation.

[0038] During the discharging process, in order to prevent the filter plate 32 from being blocked, a scraping strip 401 is fixedly installed at the bottom end of the rotating shaft 4 and is in movable contact with the bottom inner wall of the outer shell 1 and the top side of the filter plate 32 to achieve the self-cleaning operation of the filter plate 32. In addition, in order to ensure the relative stability between the inner shell 2 and the outer shell 1, a fixing ring is fixedly installed on the outer side of the inner shell 2, and the outer side of the fixing ring is fixedly connected to the inner side wall of the outer shell 1, ensuring the stability of the stirrer during the working process.

[0039] The above has introduced in detail a stirrer provided by the present utility model for improving the uniform dispersion of nano-silicon in silicon-carbon anode materials. Specific embodiments are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A stirrer for enhancing the uniform dispersion of nano-silicon in a silicon-carbon anode material, characterized in that, It includes an outer shell (1), an inner shell (2), a support assembly, a first stirring assembly, a second stirring assembly, and a slag discharge pipe (3); The inner shell (2) is fixedly installed inside the outer shell (1) and on the same vertical axis. The first stirring assembly is arranged inside the inner shell (2) and connected to the outer shell (1). The second stirring assembly is arranged inside the inner shell (2) and connected to the first stirring assembly. The bottoms of the inner shell (2) and the outer shell (1) are both spherical. A plurality of through holes (23) are formed at the bottom side position of the inner shell (2), and all the plurality of through holes (23) are located directly below the first stirring assembly. A plurality of mounting holes are formed in the side wall of the inner shell (2), and nozzles (22) are fixedly installed in all the plurality of mounting holes. All the plurality of nozzles (22) face the second stirring assembly. The support assembly is arranged on the outer shell (1). The slag discharge pipe (3) is fixedly installed at the lowest point of the bottom of the outer shell (1). The top and bottom of the outer shell (1) are respectively fixedly installed with a feed pipe (21) and a plurality of discharge pipes (31), and the bottom end of the feed pipe (21) extends into the inner shell (2).

2. A stirrer for enhancing the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 1, characterized in that: The first stirring assembly includes a motor (41), a rotating shaft (4), and a plurality of strip-shaped plates (5). The motor (41) is fixedly installed at the top of the outer shell (1). The output shaft of the motor (41) is axially fixedly installed with the rotating shaft (4). The bottom end of the rotating shaft (4) extends into the inner shell (2) and is radially fixedly installed with a plurality of strip-shaped plates (5). All the plurality of strip-shaped plates (5) are arranged obliquely.

3. A stirrer for improving the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 2, characterized in that: The second stirring assembly includes a support frame (42), a plurality of rotating rods (43), a plurality of gears (44), a toothed disc (45), and a plurality of baffles (431). The rotating shaft (4) is radially fixedly installed with the support frame (42). A plurality of rotating rods (43) parallel to the rotating shaft (4) are rotatably installed on the support frame (42). A plurality of baffles (431) are fixedly installed on all the plurality of rotating rods (43). The top ends of all the plurality of rotating rods (43) are fixedly sleeved with gears (44). The toothed disc (45) is fixedly installed on the inner wall of the top of the inner shell (2). All the plurality of gears (44) are meshed with the toothed disc (45).

4. A stirrer for improving the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 2, characterized in that: A plurality of stirring rods (51) arranged vertically are fixedly installed on the strip-shaped plate (5).

5. A stirrer for enhancing the uniform dispersion of nanosilicon in a silicon-carbon anode material according to claim 1, characterized in that: A filter plate (32) adapted to the plurality of discharge pipes (31) is fixedly installed on the inner wall of the bottom of the outer shell (1) by means of embedding.

6. The stirrer for improving the uniform dispersion of nano-silicon in the silicon-carbon anode material according to claim 2, wherein: The bottom end of the rotating shaft (4) is fixedly installed with a scraping strip (401) arranged in an arc shape, and the scraping strip (401) is in movable contact with the inner wall of the bottom of the outer shell (1) and the top side of the filter plate (32).

7. A stirrer for improving the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 1, characterized in that: A fixing ring is fixedly installed on the outside of the inner shell (2), and the outside of the fixing ring is fixedly connected to the inner side wall of the outer shell (1).

8. A stirrer for improving the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 1, characterized in that: The support assembly includes a support ring (11) and a plurality of support legs (12). The support ring (11) is fixedly installed on the outside of the outer shell (1), and a plurality of support legs (12) are fixedly installed on the bottom side of the support ring (11).

9. A stirrer for improving the uniform dispersion of nano-silicon in a silicon-carbon anode material according to claim 1, characterized in that: A hopper is fixedly installed at the top end of the feed pipe (21).

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