Lithium cobalt oxide positive electrode material sintering device

Abstract

The utility model discloses a lithium cobalt oxide positive electrode material sintering device, which belongs to the technical field of lithium cobalt oxide preparation and comprises a furnace body, a heat insulation upper sealing cover, a bearing groove, a heating structure and a cooling structure. The heat insulation upper sealing cover is arranged above the furnace body and used for sealing the furnace body, and the bearing groove is formed in the furnace body and used for bearing lithium cobalt oxide powder; the heating structure is arranged on the inner wall of the furnace body; the cooling structure comprises a first circulating pipeline, a second circulating pipeline, an air pump and a cooling box; one ends of the first circulating pipeline and the second circulating pipeline are communicated with the inner cavity of the furnace body, and the other ends are communicated with the air pump; the cooling box is arranged outside the first circulating pipeline and is used for cooling gas; and a dust adsorption box is arranged on the second circulating pipeline and is used for filtering and adsorbing dust. The utility model has the advantages of high efficiency and stable sintering process.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium cobaltate preparation, and more specifically relates to a sintering device for lithium cobaltate cathode materials. Background Technique

[0002] As one of the core materials of lithium-ion batteries, the optimization of the preparation technology of lithium cobaltate is directly related to the performance and cost of the batteries. During the production of lithium cobaltate, both raw materials and products are solid powders. When sintering in a sintering furnace, dust will float out from the inside of lithium cobaltate, filling the sintering furnace with dust. The dust inside the sintering furnace is harmful to the health of workers and even pollutes the natural environment. Existing sintering furnaces such as CN212645361U have two problems: firstly, the dust removal efficiency is not high; secondly, the gas with only dust freely disperses and moves to the dust treatment base box, and not all the floating dust inside the furnace body can be completely removed. When workers open the sintering furnace, they can still come into contact with the floating dust, and the dust escapes into the air and causes pollution.

[0003] Therefore, how to provide a sintering device for lithium cobaltate cathode materials that can quickly reduce dust is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0004] In view of this, the utility model provides a sintering device for lithium cobaltate cathode materials, adopting the following technical scheme:

[0005] A sintering device for lithium cobaltate cathode materials includes a furnace body, a heat-insulating upper cover, a bearing groove, a heating structure, and a cooling structure; the heat-insulating upper cover is arranged above the furnace body to seal the furnace body, the bearing groove is arranged inside the furnace body to bear lithium cobaltate powder; the heating structure is arranged on the inner wall of the furnace body; the cooling structure includes a first circulation pipeline, a second circulation pipeline, an air pump, and a cooling box; one end of both the first circulation pipeline and the second circulation pipeline communicates with the inner cavity of the furnace body, and the other end of both communicates with the air pump; the cooling box is arranged outside the first circulation pipeline to cool the gas; a dust adsorption box is arranged on the second circulation pipeline to filter and adsorb dust.

[0006] Furthermore, a heat preservation layer is arranged inside the furnace body, and heat preservation materials are arranged inside the heat-insulating upper cover, so that the heat-insulating upper cover and the furnace body form a sealed heat preservation space.

[0007] Furthermore, the longitudinal section of the heat-insulating upper cover is in a T shape, and a groove is circumferentially opened at the lower end of the side surface of the upper large-diameter part; a convex platform adapted to the lower small-diameter part of the heat-insulating upper cover is arranged at the upper end of the furnace body, and an elastic protrusion is arranged above the convex platform, and the elastic protrusion is matched with the groove for sealing and fixing.

[0008] Further, the heating structure includes multiple groups of resistance wire heating tubes, which are arranged on the inner wall of the furnace body in multiple groups in a partitioned manner to ensure that the temperature of the outer circumference of the carrying groove is consistent.

[0009] Further, the first circulation pipeline extends downward from the side wall of the furnace body to the lower part of the furnace body, penetrates through the cooling box, and is connected to the air pump; the second circulation pipeline extends downward from the inner wall of the furnace body on the opposite side of the first circulation pipeline and is connected to the air pump.

[0010] Further, a dust collection chamber and a filter plate are arranged inside the dust adsorption box; a slope diversion plate is arranged in the middle of the dust collection chamber to buffer large-particle dust in the concentrated part of the air flow and guide the air flow to the filter plate; multiple layers of filter elements are arranged inside the filter plate to adsorb smaller-particle dust.

[0011] Further, a first three-way valve is arranged between the first circulation pipeline and the air pump, and the third end of the first three-way valve is communicated with the air inlet pipeline; a second three-way valve is arranged between the second circulation pipeline and the air pump, and the third end of the second three-way valve is communicated with the air outlet channel.

[0012] Further, the cooling box is arranged below the furnace body, and a cooling coil is arranged inside the cooling box, which is wound around the outside of the first circulation pipeline to cool the air flow in the first circulation pipeline; both ends of the cooling coil are respectively connected to the cooling water inlet pipe and the cooling water outlet pipe, and cooling water flows through the inside, and the flow direction of the cooling water is opposite to the flow direction of the air flow in the first circulation pipeline; the cooling box is arranged downstream of the gas flow of the first three-way valve.

[0013] Further, a temperature detector is also arranged on the heat insulation upper cover and extends deep into the furnace body, and a pressure detector is also arranged to control the air pressure inside the furnace body.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The present utility model provides a sintering device for lithium cobalt oxide cathode materials. By arranging the first circulation pipeline and the second circulation pipeline, cooperating with the dust adsorption box and the cooling box, cooling and dust removal can be carried out simultaneously, improving efficiency; and by arranging the first three-way valve and the second three-way valve, connecting the air inlet pipeline and the air outlet pipeline, the temperature inside the furnace body can be controlled in cooperation with the cooling box, ensuring the stability of the sintering process. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Among them, in the figure:

[0019] 1 - furnace body; 2 - heat insulation upper cover; 3 - bearing groove; 4 - groove; 5 - resistance wire heating tube; 6 - first circulation pipeline; 7 - second circulation pipeline; 8 - air pump; 9 - cooling box; 10 - heat insulation layer; 11 - dust adsorption box; 12 - first three-way valve; 13 - second three-way valve; 14 - temperature detector; 15 - air pressure detector. Specific embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Please refer to the attached Figure 1 , the present invention provides a sintering device for lithium cobalt oxide cathode materials, including a furnace body 1, a heat insulation upper cover 2, a bearing groove 3, a heating structure and a cooling structure. The heat insulation upper cover 2 is arranged above the furnace body 1 to seal the furnace body 1 and is internally provided with heat insulation materials. The furnace body 1 is internally provided with a heat insulation layer 10, and the heat insulation upper cover 2 is internally provided with heat insulation materials, so that the heat insulation upper cover 2 and the furnace body 1 form a sealed heat insulation space; the bearing groove 3 is arranged inside the furnace body 1 and is used to carry lithium cobalt oxide powder.

[0022] The longitudinal section of the heat insulation upper cover 2 is in a T shape, and a groove 4 is circumferentially opened at the lower end of the side surface of the upper large-diameter part; the upper end of the furnace body 1 is provided with a boss adapted to the lower small-diameter part of the heat insulation upper cover 2, and an elastic protrusion is arranged above the boss, and the elastic protrusion is matched with the groove 4 for sealing and fixing.

[0023] The heating structure includes multiple groups of resistance wire heating tubes 5. The resistance wire heating tubes 5 are arranged on the inner wall of the furnace body 1 and are divided into multiple groups in a zoning manner to ensure that the temperature around the bearing groove 3 is consistent.

[0024] The cooling structure includes a first circulation pipeline 6, a second circulation pipeline 7, an air pump 8, and a cooling box 9. One end of each of the first circulation pipeline 6 and the second circulation pipeline 7 communicates with the inner cavity of the furnace body 1, and the other end communicates with the air pump 8; the air pump 8 is arranged inside the furnace body 1, below the heat insulation layer 10; the first circulation pipeline 6 extends downward from the inner side wall of the furnace body 1 to below the furnace body 1, penetrates through the cooling box 9, and connects to the air pump 8; the second circulation pipeline 7 extends downward from the inner wall of the furnace body 1 on the opposite side of the first circulation pipeline 6 to connect to the air pump 8; when the air pump 8 operates, the gas in the furnace body 1 flows in the furnace body 1 and the first and second circulation pipelines in the order of the second circulation pipeline 7 - air pump 8 - first circulation pipeline 6 - furnace body 1 - second circulation pipeline 7, and the hot gas in the furnace body 1 can be circulated through the gas to the inside of the cooling box 9, cooled by the cooling box 9 and then transported back into the furnace body 1, continuously taking away heat through the flow of the gas, and transferring heat to the cooling box 9 to achieve the cooling of the inside of the furnace body 1.

[0025] A dust adsorption box 11 is also arranged on the second circulation pipeline 7, which is used to filter and adsorb the dust volatilized into the cavity in the furnace body 1 due to the heating and sintering of lithium cobalt oxide powder; a dust collection cavity and a filter plate are arranged inside the dust adsorption box 11; a slope diversion plate is arranged in the middle of the dust collection cavity, which is used to buffer the airflow to concentrate large particle dust and guide the airflow to the filter plate; multiple filter elements are arranged inside the filter plate, which is used to adsorb smaller particle dust. One side of the dust adsorption box 11 penetrates through the side wall of the furnace body 1, and a small door is opened on the side wall of the furnace body 1. The dust adsorption box 11 can be taken out from the small door to clean the dust and replace the filter element.

[0026] A first three-way valve 12 is arranged between the first circulation pipeline 6 and the air pump 8, and the third end of the first three-way valve 12 communicates with an air inlet pipeline. A second three-way valve 13 is arranged between the second circulation pipeline 7 and the air pump 8, and the third end of the second three-way valve 13 communicates with an air outlet channel.

[0027] The cooling box 9 is arranged below the furnace body 1, and a cooling coil is arranged inside the cooling box 9, which is wound around the outside of the first circulation pipeline 6 and is used to cool the airflow in the first circulation pipeline 6. Both ends of the cooling coil are respectively connected to a cooling water inlet pipe and a cooling water outlet pipe, and cooling water flows through the inside. The flow direction of the cooling water is opposite to the flow direction of the airflow in the first circulation pipeline. The cooling box 9 is arranged downstream of the gas flow of the first three-way valve 12, and can also be used to control the temperature inside the furnace body 1 during the heating and sintering stage to ensure the stability of the sintering process.

[0028] A temperature detector 14 is also arranged on the heat insulation upper cover 2 and extends deep into the furnace body 1, which is used to measure the sintering temperature. A pressure detector 15 is also arranged on the heat insulation upper cover 2, which is used to control the air pressure inside the furnace body 1.

[0029] Before heating the lithium cobaltate powder, control the first three-way valve 12 and the second three-way valve 13 to connect the first circulation pipeline 6 and the air inlet pipeline, and the second circulation pipeline 7 and the air outlet channel. Pass an appropriate amount of oxygen into it through the air inlet pipeline and continuously pass an appropriate amount of oxygen during sintering to ensure the oxygen concentration of the lithium cobaltate powder during sintering. After sintering is completed, control the first three-way valve 12 and the second three-way valve 13 to connect the first circulation pipeline 6 and the air pump 8, and the second circulation pipeline 7 and the air pump 8. At the same time, disconnect the air inlet pipeline and the air outlet pipeline, and start the air pump 8 to make the gas in the furnace body 1 enter the second circulation pipeline 7. First, filter the dust in the gas through the dust adsorption box 11, then transfer the heat to the cooling box 9, and after being cooled and temperature-reduced by the cooling box 9, enter the inner cavity of the furnace body 1 again. In this way, the heat and dust are carried away by circulating flow, and dust removal and cooling can be achieved simultaneously.

[0030] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and reference can be made to the description in the method part for relevant parts.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lithium cobalt oxide positive electrode material sintering device, characterized in that: The invention comprises a furnace body (1), an insulating upper cover (2), a bearing groove (3), a heating structure and a cooling structure; the insulating upper cover (2) is arranged above the furnace body (1) and is used to seal the furnace body (1); the bearing groove (3) is arranged inside the furnace body (1) and is used to bear lithium cobalt oxide powder; the heating structure is arranged on the inner wall of the furnace body (1); the cooling structure comprises a first circulation pipeline (6), a second circulation pipeline (7), an air pump (8) and a cooling box (9); one end of the first circulation pipeline (6) and the second circulation pipeline (7) are both connected to the inner cavity of the furnace body (1), and the other end is both connected to the air pump (8); the cooling box (9) is arranged outside the first circulation pipeline (6) and is used to cool the gas; the second circulation pipeline (7) is provided with a dust adsorption box (11) for filtering and adsorbing dust.

2. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: A heat-insulating layer (10) is arranged inside the furnace body (1), and a heat-insulating material is arranged inside the heat-insulating upper cover (2), so that the heat-insulating upper cover (2) and the furnace body (1) form a sealed heat-insulating space.

3. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: The heat-insulating upper cover (2) has a T-shaped longitudinal section, and a groove (4) is provided in the circumferential direction on the lower end of the side surface of the upper large-diameter portion; a boss matched with the lower small-diameter portion of the heat-insulating upper cover (2) is provided at the upper end of the furnace body (1), and an elastic protrusion is provided above the boss, and the elastic protrusion cooperates with the groove (4) for sealing and fixing.

4. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: The heating structure comprises a plurality of groups of resistance wire heating tubes (5), wherein the resistance wire heating tubes (5) are arranged on the inner wall of the furnace body (1) in a plurality of partitioned groups, so as to ensure that the temperature of the outer circumference of the bearing groove (3) remains consistent.

5. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: The first circulation pipe (6) extends downward from the side wall of the furnace body (1) to the bottom of the furnace body (1), passes through the cooling box (9), and is connected to the air pump (8); the second circulation pipe (7) extends downward from the inner wall of the furnace body (1) on the opposite side of the first circulation pipe (6) and is connected to the air pump (8).

6. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: The dust adsorption box (11) is provided with a dust collecting chamber and a filter plate inside; a slope guide plate is provided in the middle of the dust collecting chamber to buffer the large dust particles concentrated in the airflow and guide the airflow to the filter plate; a multi-layer filter element is provided inside the filter plate to adsorb smaller dust particles.

7. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: A first three-way valve (12) is provided between the first circulation pipeline (6) and the air pump (8), and the third end of the first three-way valve (12) is connected to the air inlet pipeline; a second three-way valve (13) is provided between the second circulation pipeline (7) and the air pump (8), and the third end of the second three-way valve (13) is connected to the air outlet channel.

8. The lithium cobalt oxide positive electrode material sintering device according to claim 7, characterized in that: The cooling box (9) is arranged below the furnace body (1), and a cooling coil is arranged inside the cooling box (9), which is wound around the outside of the first circulation pipe (6) and is used to cool the airflow in the first circulation pipe (6); the two ends of the cooling coil are respectively connected to a cooling water inlet pipe and a cooling water outlet pipe, and cooling water flows inside, and the cooling water circulation direction is opposite to the airflow direction in the first circulation pipe (6); the cooling box (9) is arranged downstream of the gas flow of the first three-way valve (12).

9. The lithium cobalt oxide positive electrode material sintering device according to claim 1, characterized in that: The heat-insulating upper cover (2) is also provided with a temperature detector (14) which extends deep into the furnace body (1), and is also provided with an air pressure detector (15) for controlling the air pressure inside the furnace body (1).

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