Hard carbon negative electrode material coating device

Abstract

The utility model relates to the technical field of sodium ion batteries, in particular to a hard carbon negative electrode material coating device which comprises a coating kettle, a stirring mechanism and a screening mechanism, and the coating kettle comprises a kettle body; the stirring mechanism comprises a stirring unit rotationally mounted in the kettle body and a power unit for driving the stirring unit; the screening mechanism comprises a screen a arranged above the stirring unit, a screen b stacked on the screen a and rotatably arranged, a paving mechanism which is in power connection with the stirring unit and intermittently drives the screen b to rotate, and a limiting unit for driving the screen b to reset, and the paving mechanism is matched with a reset unit to drive the screen b to rotate relative to the screen a and then reset. And the screen holes in the two groups of screens are aligned and then staggered, so that graphite powder is discontinuously and uniformly scattered and is mixed with asphalt flowing below, and the technical problems of non-uniform particle size and poor coating quality after coating caused by easy agglomeration of graphite and asphalt in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium ion batteries, in particular to a hard carbon negative electrode material coating device. Background Art

[0002] Natural graphite is widely used due to its high charge and discharge capacity, good charge and discharge platform, wide sources and low cost. However, graphite has the disadvantages of large irreversible capacity loss for the first time or fast capacity decay during the cycle. Therefore, in order to improve the electrochemical properties of graphite, asphalt is often mixed with graphite particles, and then heated and carbonized to coat the surface of graphite particles.

[0003] The utility model patent with Chinese patent application number CN202123050377.2 discloses a device for coating graphite negative electrode materials with liquid asphalt, which belongs to the technical field of manufacturing negative electrode materials for lithium-ion batteries, and comprises a coating cylinder, wherein a heating device is provided on the wall of the coating cylinder; a scraper device, a scattering device and a spraying device are arranged in the coating cylinder, and the spraying device is arranged in the upper part of the coating cylinder; the scattering device can be rotatably arranged at the bottom of the coating cylinder; the scraper device is arranged above the scattering device; the scraper device is used to scrape off the adhesion on the inner wall of the coating cylinder, and the scraper device can be rotatably arranged; the present invention can form a complete, dense, uniformly coated coating layer with an active surface, thereby improving the coating quality; reducing the mixing time, improving the mixing coating efficiency; reducing the input of manpower and material resources, and reducing energy consumption.

[0004] However, the breaking mechanism of the equipment does not have the ability to break up asphalt graphite agglomerates of all specifications, so asphalt graphite agglomerates will still appear, which will lead to uneven particle size after coating and poor coating quality. Utility Model Content

[0005] In view of the above problems, the utility model provides a hard carbon negative electrode material coating device, which stirs the asphalt through a stirring unit, and at the same time, a flattening mechanism cooperates with a reset unit to drive the screen b to rotate relative to the screen a and then reset it, so that the screen holes on the two groups of screens are aligned and then offset, so that the graphite powder is intermittently and evenly sprinkled and mixed with the asphalt flowing below, which solves the technical problem in the prior art that graphite and asphalt are easy to agglomerate, resulting in uneven particle size after coating and poor coating quality.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hard carbon negative electrode material coating device, comprising

[0008] A coating kettle, the coating kettle comprising a kettle body, a feed inlet and a discharge outlet arranged on the kettle body, and a heating mechanism arranged on the inner wall of the kettle body;

[0009] A stirring mechanism, the stirring mechanism comprising a stirring unit rotatably mounted inside the kettle body and a power unit driving the stirring unit; and

[0010] A screening mechanism, the screening mechanism includes a screen a arranged above the stirring unit, a screen b stacked on the screen a and rotatably arranged, a flattening mechanism which is dynamically connected to the stirring unit and intermittently drives the screen b to rotate, and a limiting unit which drives the screen b to reset, the flattening mechanism can flatten the material on the screen b, and the sieve holes on the screen a and the screen b can be aligned and staggered.

[0011] As an improvement, the stirring unit includes a vertically arranged rotating shaft and a propeller blade spirally arranged below the rotating shaft.

[0012] As an improvement, the power unit includes a mounting frame mounted on the kettle body and a motor arranged on the mounting frame and connected to the rotating shaft.

[0013] As an improvement, the inner diameter of the kettle body is α, and the outer diameter of the propeller blade is β, then α:β=4:3.

[0014] As an improvement, the paving mechanism includes a cross bar fixedly connected to the rotating shaft, a plurality of groups of vertical bars arranged in an array on the cross bar along the length direction of the cross bar and with free ends facing the screen b, a plurality of groups of wedge blocks a distributed in a circular array above the outer side of the screen b, and contact rods elastically arranged above and below the outermost vertical bars and arranged to contact the wedge blocks a.

[0015] As an improvement, the limiting unit includes mounting grooves distributed in a circular array at the edge of the screen a, a mounting plate installed on the screen b and extending into the mounting grooves, and a spring connecting the mounting plate and the side wall of the mounting groove.

[0016] The beneficial effects of the utility model are:

[0017] (1) The stirring mechanism of the utility model makes the asphalt in the kettle body fluid. The paving mechanism cooperates with the reset unit to drive the screen b to rotate relative to the screen a and then reset. Then, the screen holes on the two sets of screens are aligned and then offset, so that the graphite powder is intermittently and evenly sprinkled and mixed with the asphalt flowing below, which solves the technical problem of uneven particle size after coating and poor coating quality caused by the easy agglomeration of graphite and asphalt in the prior art.

[0018] (2) The plurality of vertical rods in the flattening mechanism of the utility model move the graphite powder on the screen b, which can effectively prevent the graphite powder from blocking the screen holes, ensure that the graphite powder can be evenly scattered, and improve the coating efficiency;

[0019] (3) The graphite powder of the utility model is sprinkled from the sieve, that is, two groups of sieves are used to screen and filter the graphite powder, so that the particle size after coating is more uniform, and a complete, dense, and uniform coating layer is formed on the outside of the particles, thereby improving the coating quality.

[0020] In summary, the utility model has the advantages of clever design, simple structure and good coating efficiency, and is particularly suitable for the production of negative electrode materials for sodium ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a cross-sectional schematic diagram of the utility model Figure 1 ;

[0024] Figure 4 This is a cross-sectional schematic diagram of the utility model Figure 2 ;

[0025] Figure 5 Schematic diagram of the reset unit structure. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] Example:

[0030] like Figure 1 and Figure 2 As shown, a hard carbon negative electrode material coating device comprises

[0031] A coating kettle 1, the coating kettle 1 comprising a kettle body 11, a feed port 12 and a discharge port 13 arranged on the kettle body 11, and a heating mechanism 14 arranged on the inner wall of the kettle body 11;

[0032] A stirring mechanism 2, the stirring mechanism 2 comprising a stirring unit 21 rotatably mounted inside the kettle body 11 and a power unit 22 driving the stirring unit 21; and

[0033] The screening mechanism 3 includes a screen a31 arranged above the stirring unit 21, a screen b32 stacked on the screen a31 and rotatably arranged, a flattening mechanism 33 which is power-connected to the stirring unit 21 and intermittently drives the screen b32 to rotate, and a limiting unit 34 which drives the screen b32 to reset. The flattening mechanism 33 can flatten the material on the screen b32, and the sieve holes on the screen a31 and the screen b32 can be aligned and staggered.

[0034] It should be noted that the screen a31 is fixed, the screen b32 is closely attached to the screen a31, and the screen b32 is rotatable.

[0035] Further, such as Figure 3 As shown, the stirring unit 21 includes a vertically arranged rotating shaft 211 and a propeller blade 212 spirally arranged below the rotating shaft 211 .

[0036] Further, such as Figure 4 As shown, the inner diameter of the kettle body 11 is α, and the outer diameter of the propeller blade 212 is β, so α:β=4:3.

[0037] It should be noted that the propeller blades 212 transport the asphalt downward, and the asphalt around them moves upward, thereby improving the fluidity of the asphalt.

[0038] Furthermore, the power unit 22 includes a mounting frame 221 mounted on the kettle body 11 and a motor 222 disposed on the mounting frame 221 and connected to the rotating shaft 211 .

[0039] It should be noted that the motor 222 is a reduction motor.

[0040] Further, such as Figure 2 As shown, the paving mechanism 33 includes a cross bar 331 fixedly connected to the rotating shaft 211, a plurality of groups of vertical rods 332 arranged in an array on the cross bar 331 along the length direction of the cross bar 331 and with the free ends facing the screen b32, a plurality of groups of wedge blocks a333 distributed in a circular array above the outer side of the screen b32, and contact rods 334 elastically arranged above and below the outermost vertical rods 332 and capable of contacting the wedge blocks a333.

[0041] It should be noted that several groups of the vertical rods 332 can effectively prevent the mesh holes on the screen from being blocked.

[0042] Further, such as Figure 5 As shown, the limiting unit 34 includes mounting grooves 341 distributed in a circular array at the edge of the screen a31, a mounting plate 342 installed on the screen b32 and extending into the mounting grooves 341, and a spring 343 connecting the mounting plate 342 and the side wall of the mounting groove 341.

[0043] It should be noted that the rigidity of the spring driving the contact rod 334 to move is higher than the sum of the several groups of springs 343, so that the screen b32 rotates first, and then the contact rod 334 contracts, and the contact rod 334 passes over the wedge block a333.

[0044] It should be further explained that, during the resetting process of the screen b32, the graphite powder on it will be shaken to further prevent the screen holes from being blocked.

[0045] Working process:

[0046] The power unit 22 drives the stirring unit 21 to rotate so that the asphalt flows in the kettle body 11. At the same time, the horizontal rod 331 drives several groups of the vertical rods 332 to move. The vertical rods 332 move the graphite powder on the screen b32. The contact rod 334 contacts the wedge block a333, and the spring 343 is compressed. The screen b32 rotates the sieve holes thereon to align with the sieve holes on the screen a31, and the graphite powder is evenly sprinkled and mixed with the asphalt. Then, the contact rod 334 contracts and passes over the wedge block a333. Under the action of the spring 343, the screen b32 is reset, and as it rotates, the graphite powder is intermittently sprinkled and mixed with the asphalt.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hard carbon negative electrode material coating device, characterized in that: include A coating kettle (1), the coating kettle (1) comprising a kettle body (11), a feed inlet (12) and a discharge outlet (13) arranged on the kettle body (11), and a heating mechanism (14) arranged on the inner wall of the kettle body (11); A stirring mechanism (2), the stirring mechanism (2) comprising a stirring unit (21) rotatably mounted inside the kettle body (11) and a power unit (22) driving the stirring unit (21); and A screening mechanism (3), the screening mechanism (3) comprising a screen a (31) arranged above the stirring unit (21), a screen b (32) stacked on the screen a (31) and rotatably arranged, a flattening mechanism (33) connected to the stirring unit (21) by power and intermittently driving the screen b (32) to rotate, and a limiting unit (34) driving the screen b (32) to reset, the flattening mechanism (33) being able to flatten the material on the screen b (32), and the screen holes on the screen a (31) and the screen b (32) being able to be aligned or offset.

2. A hard carbon negative electrode material coating device according to claim 1, characterized in that: The stirring unit (21) comprises a vertically arranged rotating shaft (211) and a propeller blade (212) spirally arranged below the rotating shaft (211).

3. A hard carbon negative electrode material coating device according to claim 2, characterized in that: The power unit (22) comprises a mounting frame (221) mounted on the kettle body (11) and a motor (222) arranged on the mounting frame (221) and connected to the rotating shaft (211) by power.

4. A hard carbon negative electrode material coating device according to claim 2, characterized in that: The inner diameter of the kettle body (11) is α, and the outer diameter of the propeller blade (212) is β, so α:β=4:

3.

5. A hard carbon negative electrode material coating device according to claim 2, characterized in that: The paving mechanism (33) comprises a cross bar (331) fixedly connected to the rotating shaft (211), a plurality of groups of vertical bars (332) arranged in an array on the cross bar (331) along the length direction of the cross bar (331) and with their free ends facing the screen b (32), a plurality of groups of wedge blocks a (333) distributed in a circular array above the outer side of the screen b (32), and contact bars (334) elastically arranged above and below the outermost vertical bars (332) and arranged to contact with the wedge blocks a (333).

6. A hard carbon negative electrode material coating device according to claim 1, characterized in that: The limiting unit (34) comprises mounting grooves (341) distributed in a circumferential array at the edge of the screen a (31), a mounting plate (342) mounted on the screen b (32) and extending into the mounting groove (341), and a spring (343) connecting the mounting plate (342) and the side wall of the mounting groove (341).

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