Calcination device

Abstract

The utility model discloses a calcining device which comprises a storage platform, a supporting structure, an air guide structure and a heat conduction space. The air guide structure protrudes out of the center of the bottom face of the storage platform and comprises a surface diffusing from the center to the periphery. The heat conduction space is located below the storage platform, and the air guide structure is located above the heat conduction space. The supporting structure is supported at the bottom of the storage platform and surrounds the periphery of the heat conduction space. The supporting structure comprises a heat conduction channel communicating the inside and the outside of the heat conduction space. Inlet air is effectively and uniformly dispersed, the height of a material placing platform is increased, materials can be placed in an effective temperature field of a hearth, meanwhile, a circulating temperature field can be well formed, heat resistance is avoided, a large number of invalid experiments can be reduced, the effects of reducing cost and improving efficiency are achieved, and the device has the advantages of being simple in structure, easy and convenient to operate and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of calcination equipment and facilities, and more specifically, to a calcination device for a cathode material of a lithium-ion battery. Background Art

[0002] Calcination is one of the indispensable processes for preparing the cathode material of a lithium-ion battery. The particle size effect and component effect during the calcination process have an important impact on the microstructure and performance of the sintered material. Ventilation is also one of the essential conditions in the calcination process. Whether the gas is evenly distributed in the furnace and whether the waste gas is discharged in time directly affect whether the material reacts sufficiently, and thus affect the material performance.

[0003] Currently, the calcination furnaces in laboratories generally use heating wires for heating. The heating wires are exposed inside the furnace chamber, and a layer of silicon carbide furnace bottom plate needs to be padded. In this way, the bottom heating surface is blocked by the furnace bottom plate, and the material placement position is closer to the bottom and farther from the effective temperature field inside the furnace chamber, resulting in uneven heating temperature of the materials in the furnace. Local overheating and overburning occur during the heating process of the product, thus affecting the quality and performance of the product.

[0004] In addition, the volume of the gas generated during the calcination process is greater than the volume of the gas consumed. Therefore, during the calcination process, it is necessary to ensure that the generated waste gas is discharged in time and that there is sufficient gas supply. If the waste gas is not discharged in time or the intake air is short, the pressure inside the furnace chamber of the calcination furnace will continue to decrease, and the reaction equilibrium will shift to the left, resulting in a slowdown in the reaction rate, which is not conducive to the formation and growth of grains. Eventually, the reaction will be incomplete, affecting the material performance. Currently, the experimental gas is directly connected to the experimental furnace through a pipeline and a flow meter, and the gas enters the furnace chamber in a bundled state, resulting in uneven gas distribution, thus affecting the quality and performance of the product.

[0005] Therefore, how to provide a calcination device that ensures uniform heating and uniform gas distribution during the processing process has become a technical problem that needs to be solved urgently in this field. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a calcination device that ensures uniform heating and uniform gas distribution during the processing process.

[0007] The utility model provides a calcination device, which includes a placement platform, a support structure, a gas guiding structure, and a heat conduction space; the gas guiding structure protrudes from the center of the bottom surface of the placement platform and includes a surface that diffuses from the center to the periphery; the heat conduction space is located below the placement platform, and the gas guiding structure is located above the heat conduction space; the support structure supports the bottom of the placement platform and surrounds the outer periphery of the heat conduction space, and the support structure includes a heat conduction channel that communicates the inside and outside of the heat conduction space.

[0008] Optionally, the surface of the air guiding structure is spherical, conical or curved, and the protruding direction of the surface of the air guiding structure is away from the placement platform.

[0009] Optionally, the support structure is a support plate, the heat conduction channel includes air vents, and a plurality of air vents are uniformly arranged on the support plate.

[0010] Optionally, the number of air vents is 40 - 60 per square decimeter.

[0011] Optionally, the heat conduction channel further includes an air vent notch, and the air vent notch is an arched opening extending upward from the center of the bottom of the support plate.

[0012] Optionally, the placement platform includes one of a square, a rectangle, and a circle; the included angle between the support plate and the placement platform is 90° - 120°.

[0013] Optionally, the distance from the top of the arched opening to the bottom of the support plate is 2 / 3 - 4 / 5 of the height of the support plate.

[0014] Optionally, the calcination device is used to be placed in the furnace chamber of the experimental furnace, and the height of the support structure is 1 / 3 - 1 / 2 of the height of the furnace chamber.

[0015] Optionally, in the thickness direction of the placement platform, the maximum thickness of the air guiding structure is 1 / 4 - 1 / 3 of the height of the calcination device.

[0016] Optionally, the manufacturing material of the calcination device is one or more of silicon carbide, graphite, and corundum products with an alumina content of more than 95%.

[0017] According to the technical content disclosed by the present utility model, the following beneficial effects are achieved:

[0018] For the calcination device provided by the present utility model, the support structure supports the bottom of the placement platform, so that the placement platform is suspended in the experimental furnace, and the positive electrode material placed on the placement platform can be within the height range where the effective temperature field is located in the furnace chamber; the air guiding structure protrudes from the center of the bottom surface of the placement platform and is located above the heat conduction space, and the center of the surface of the air guiding structure corresponds to the air inlet position at the bottom of the furnace chamber, so that the bundled gas entering the furnace chamber can blow onto the surface of the air guiding structure. The air guiding structure can effectively disperse the bundled gas, and the dispersed gas is dispersed around the furnace chamber through the heat conduction channels on the support structure, so that the gas is as evenly distributed as possible in the furnace chamber, improving the sintering consistency of the product.

[0019] Through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings, other features and advantages of the present utility model will become clear. Description of the Drawings

[0020] The accompanying drawings incorporated in and constituting a part of this specification illustrate embodiments of the present utility model and, together with the description thereof, are used to explain the principles of the present utility model.

[0021] Figure 1 It is a first perspective structure diagram of the calcination device of the present utility model.

[0022] Figure 2 It is a second perspective structure diagram of the calcination device of the present utility model.

[0023] Figure 3 It is a second perspective structure diagram of the calcination device of the present utility model.

[0024] Figure 4 It is a sectional view taken along line A-A of the calcination device of the present utility model.

[0025] Explanation of reference numerals in the drawings: 1, placement platform; 2, support plate; 21, ventilation holes; 22, ventilation gaps; 3, heat conduction space; 4, gas guiding structure. Detailed implementation manners

[0026] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation on the present utility model or its application or use.

[0028] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as a part of the specification.

[0029] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0030] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] The object of the present utility model is to provide a lithium-ion cathode material calcination device that can effectively and evenly disperse the intake air, improve the placement platform, enable the material to be placed in the effective temperature field of the furnace chamber, and at the same time can preferably form a circulating temperature field and does not block heat. It can evenly disperse the gas entering the furnace chamber and has the advantages of simple structure, simple operation, easy operation, simple process, and low cost.

[0032] See Figures 1 to 3 , the present utility model discloses a calcination device, and the manufacturing materials of the calcination device are one or more of silicon carbide, graphite, and corundum products with an alumina content of more than 95%. The structure includes a placement platform 1, a support structure, a gas guiding structure 4, and a heat conduction space 3.

[0033] In this embodiment, the placement platform 1 is a square flat plate. Combining Figure 4 , the gas guiding structure 4 is a spherical crown-shaped protrusion protruding from the center of the bottom surface of the placement platform 1. The spherical crown-shaped protrusion has a surface that spreads from the center of the placement platform 1 to the surroundings. In the thickness direction of the placement platform 1, the maximum thickness of the gas guiding structure 4 is 1 / 4 to 1 / 3 of the height of the calcination device. The support structure is a support plate 2, and the four support plates 2 are respectively fixedly connected to the four sides of the placement platform 1 to support the placement platform 1 to a preset height and form a heat conduction space 3 below the placement platform 1 and the gas guiding structure 4. The four support plates 2 surround the heat conduction space 3, and heat conduction channels penetrating through the thickness direction are provided on the support plates 2, and the heat conduction channels communicate with both sides inside and outside the heat conduction space 3. After the calcination device is placed in the furnace chamber of the experimental furnace, the height of the support structure is 1 / 3 to 1 / 2 of the height of the furnace chamber. The gas guiding structure 4 corresponds to the air inlet position at the bottom of the furnace chamber, so that the bundled gas entering the furnace chamber can blow to the center position of the gas guiding structure 4, that is, the air flow direction of the bundled gas entering the furnace chamber is directly opposite to the center of the spherical crown surface of the gas guiding structure 4. The spherical crown surface evenly guides and disperses the bundled gas entering the heat conduction space 3 to the surroundings of the spherical crown surface. The dispersed gas is dispersed to the surroundings of the furnace chamber through the heat conduction channels on the support structure and discharged from the heat conduction channels on the support plate 2 out of the heat conduction space 3. In some embodiments, the surface of the gas guiding structure 4 is a conical surface or a curved surface, and the protruding direction of the surface of the gas guiding structure 4 is away from the placement platform 1, as long as the air flow can be evenly guided to the surroundings of the gas guiding structure 4.

[0034] The heat conduction channels of the support plate 2 include an arched air permeable notch 22 opened at the bottom of the support plate 2 and air permeable holes evenly distributed on the support plate 2. The air permeable notch 22 is an arched opening extending upward from the center of the bottom of the support plate 2, and the distance from the top of the arched opening to the bottom of the support plate 2 is 2 / 3 - 4 / 5 of the height of the support plate 2. A plurality of air permeable holes 21 are evenly distributed on the surface of the support plate 2 and at least one row of air permeable holes 21 is arranged above the air permeable notch 22. The air permeable holes 21 are round holes, and the number is 40 - 60 per square decimeter.

[0035] In some embodiments, the placement platform 1 includes one of a square, a rectangle, and a circle; the included angle between the support plate 2 and the placement platform 1 is a right angle or an obtuse angle, preferably 90° - 120°.

[0036] Specific embodiments: Combining Figure 1 and Figure 2A calcination device, comprising a placement platform 1, a support plate 2, and a spherical cap-shaped air guiding structure 4. An arched air permeable notch 22 is formed at the bottom of the support plate 2, and the radius of the air permeable notch 22 is 4 / 5 of the height of the device. The support plate 2 is a mesh plate, and the four-sided mesh plates form a 90° right angle with the placement platform 1 of the device, and the overall shape of the device is a cube. The height of the device is 1 / 2 of the height of the experimental furnace chamber. Air permeable holes 21 are evenly distributed on all parts of the four-sided mesh plates. The air guiding structure 4 is located at the center of the reverse side of the material placement platform of the device, and the radius is 1 / 3 of the height of the device.

[0037] In summary, for the calcination device provided by the present utility model, compared with the existing calcination platform, when the present utility model is used for material calcination, it is placed at the center position of the furnace chamber, and the spherical cap-shaped air guiding structure 4 corresponds to the air inlet position at the bottom of the furnace chamber, so that the bundled gas entering the furnace chamber can blow to the center position of the spherical cap-shaped air guiding structure 4. The spherical cap-shaped air guiding structure 4 can effectively disperse the bundled gas, and the dispersed gas is effectively dispersed around the furnace chamber through the air permeable notch 22 and the air permeable holes 21 on the support plate 2. Since the height of the calcination device is 1 / 2 of the height of the furnace chamber, the placement platform 1 is within the effective temperature field of the furnace chamber, and the sintering consistency of the product is relatively good. Using this device can reduce a large number of ineffective experiments, achieve the effect of cost reduction and efficiency improvement, and at the same time can effectively and evenly disperse the air inlet, increase the height of the placement platform 1, enable the material to be placed within the effective temperature field of the furnace chamber, and at the same time can preferably form a circulating temperature field, without heat resistance, and has the advantages of simple structure, convenient operation, and low cost.

[0038] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A calcining device, characterized in that: include: Storage platform, support structure, air guide structure and heat conduction space; The air guide structure is protruding at the center of the bottom surface of the storage platform, and includes a surface that spreads from the center to the surroundings; The heat-conducting space is located below the storage platform, and the air-conducting structure is located above the heat-conducting space; The support structure is supported at the bottom of the storage platform and surrounds the outer periphery of the heat-conducting space. The support structure includes a heat-conducting channel connecting the inside and outside of the heat-conducting space.

2. The calcining device according to claim 1, characterized in that: The surface of the air-guiding structure is spherical, conical or curved, and the convex direction of the surface of the air-guiding structure is away from the storage platform.

3. The calcining device according to claim 1 or 2, characterized in that: The supporting structure is a supporting plate, the heat conduction channel comprises air holes, and a plurality of air holes are evenly arranged on the supporting plate.

4. The calcining device according to claim 3, characterized in that: The number of the air holes is 40-60 per square decimeter.

5. The calcining device according to claim 3, characterized in that: The heat conduction channel also includes a ventilation gap, and the ventilation gap is an arched opening extending upward from the bottom center of the support plate.

6. The calcining device according to claim 5, characterized in that: The storage platform includes one of square, rectangular and circular shapes; The angle between the support plate and the storage platform is 90°-120°.

7. The calcining device according to claim 5, characterized in that: The distance between the top of the arched opening and the bottom of the support plate is 2 / 3-4 / 5 of the height of the support plate.

8. The calcining device according to claim 1 or 2, characterized in that: The calcining device is used to be placed in the furnace of the experimental furnace, and the height of the supporting structure is 1 / 3 to 1 / 2 of the height of the furnace.

9. The calcining device according to claim 1 or 2, characterized in that: In the thickness direction of the storage platform, the maximum thickness of the gas guide structure is 1 / 4 to 1 / 3 of the height of the calcining device.

10. The calcining device according to claim 1 or 2, characterized in that: The calcining device is made of one or more materials selected from silicon carbide, graphite and corundum products with an aluminum oxide content of more than 95%.

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