Lithium iron phosphate sintering device

Abstract

The utility model discloses a lithium iron phosphate sintering device which comprises a base and a sintering furnace, a connecting seat a and a connecting seat b are fixed on the side face of the top end of the base, rotating shafts rotationally connected with the top ends of the connecting seat a and the connecting seat b are fixed at the central positions of the two ends of the sintering furnace, and a servo motor is fixed at the top end of the connecting seat b; the heating device comprises a main pipe and a branch pipe, the air inlet end of the main pipe passes through the center of one end of the sintering furnace and simultaneously penetrates through the connecting seat a, and the other end of the main pipe is sealed and close to the other end of the sintering furnace; the branch pipe is arranged at the lower end of the main pipe; the main pipe and the branch pipe are internally provided with cavities and are communicated; the main pipe and the branch pipes are coated with electrothermal films. The contact mixing sufficiency of mixed raw materials can be effectively improved, the contact area of the mixed raw materials and oxygen during sintering of the sintering furnace is increased, and the purpose of improving the reaction efficiency is achieved. The lithium iron phosphate sintering furnace is suitable for producing and processing lithium iron phosphate and is used for sintering lithium iron phosphate.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium iron phosphate production, in particular to a lithium iron phosphate sintering device. Background Art

[0002] In the prior art, lithium iron phosphate can be used as a positive electrode material for producing power lithium-ion batteries. When processing battery materials, it often has good high-rate charge and discharge performance and a large specific capacity.

[0003] Lithium iron phosphate is considered to be a lithium-ion electrode positive electrode material with great application potential due to its low price, high safety, no environmental pollution, large specific capacity and good cyclability. The preparation of lithium iron phosphate in the current existing technology is generally carried out in a sintering furnace, and the furnace is protected by an inert gas to allow the reaction to obtain lithium iron phosphate with higher density.

[0004] At present, the preparation of lithium iron phosphate in the prior art is generally carried out in a sintering furnace, and the furnace is protected by an inert gas so that the reaction can obtain lithium iron phosphate with higher density. The following problems exist in the process of preparing lithium iron phosphate in a sintering furnace:

[0005] First, the reaction raw materials are left to stand in the sintering furnace, and the raw materials are poorly contacted and mixed;

[0006] Secondly, during the sintering process of lithium iron phosphate, oxygen is required to participate in the reaction. However, in the prior art, oxygen is only in contact with the upper surface of the mixed raw materials, so that the mixed raw materials cannot be fully in contact with oxygen, thereby affecting the reaction efficiency.

[0007] Therefore, a lithium iron phosphate sintering device is needed to solve the problem of poor contact and mixing of raw materials in the sintering furnace and low reaction efficiency during the preparation of lithium iron phosphate, which affects the processing efficiency. Utility Model Content

[0008] In order to solve the above deficiencies in the prior art, the utility model aims to provide a lithium iron phosphate sintering device to improve the contact and mixing adequacy of the mixed raw materials, increase the contact area between the mixed raw materials and oxygen in the sintering furnace during sintering, and improve the reaction efficiency.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0010] A lithium iron phosphate sintering device, comprising a base and a sintering furnace, a connecting seat a and a connecting seat b are fixed on the top side of the base, a rotating shaft rotatably connected to the top of the connecting seat a and the connecting seat b is fixed at the center of both ends of the sintering furnace, and a servo motor is fixed on the top of the connecting seat b;

[0011] By setting a servo motor on the connecting seat, the rotation position and speed of the motor can be controlled by digital signals. While controlling the reciprocating rotation of the sintering furnace, the rotation amplitude of the sintering furnace can also be accurately controlled;

[0012] As a limitation of the present invention, the lithium iron phosphate sintering device also includes a heating device, which includes a main pipe and a branch pipe, the air inlet end of the main pipe passes through the center of one end of the sintering furnace and penetrates the connecting seat a at the same time, and the other end is sealed and close to the other end of the sintering furnace; the branch pipe is arranged at the lower end of the main pipe; the main pipe and the branch pipe are both built-in with cavities and are connected; the outside of the main pipe and the branch pipe is covered with an electric heating film;

[0013] The air inlet end of the main pipe can introduce oxygen into the sintering furnace through the branch pipe connected to the main pipe, and then introduce it into the mixed raw material of sintering lithium iron phosphate, so that the oxygen can fully contact and react with the mixed raw material, thereby increasing the contact area between the mixed raw material and oxygen;

[0014] As a further limitation of the present invention, a stirring blade is fixedly provided at the lower end of the branch pipe away from the main pipe;

[0015] By arranging a stirring blade at the lower end of the branch pipe, the mixed raw materials can be further stirred by the stirring blade at the lower end of the branch pipe during the reciprocating swing of the mixed raw materials in the sintering furnace during the rotation process, thereby fully improving the contact adequacy of the raw materials in the mixed raw materials. At the same time, the stirring blade expands the contact area of ​​the lower end of the branch pipe, thereby preventing the branch pipe from being damaged by the impact of the reciprocating motion of the mixed raw materials, dispersing the contact force between the branch pipe and the mixed raw materials, and reducing the equipment maintenance cost.

[0016] As another limitation of the present invention, a feed pipe is provided on the side wall of one end of the sintering furnace, and a discharge pipe is provided at the bottom of the other end;

[0017] As a third limitation of the present utility model, a ventilation valve is provided at the top of the sintering furnace;

[0018] The gas exchange valve can be set to balance the internal pressure of the sintering furnace, prevent the internal pressure of the sintering furnace from being too high due to the high temperature environment of the sintering process, and reduce the risk of the sintering furnace bursting due to the thermal expansion of the internal gas;

[0019] As a fourth limitation of the present utility model, a gas tank groove is provided at one end of the base, and the gas tank groove includes a slideway and a tank placement groove;

[0020] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0021] (1) The lithium iron phosphate sintering device of the utility model can control the rotation position and speed of the motor through digital signals by arranging a servo motor on the connecting seat, thereby controlling the reciprocating rotation of the sintering furnace and accurately controlling the rotation amplitude of the sintering furnace;

[0022] (2) The lithium iron phosphate sintering device of the utility model can introduce oxygen into the sintering furnace through the air inlet end of the main pipe and introduce it into the mixed raw materials for sintering lithium iron phosphate through the branch pipe connected to the main pipe, so that the oxygen can fully contact and react with the mixed raw materials, thereby increasing the contact area between the mixed raw materials and oxygen;

[0023] (3) The lithium iron phosphate sintering device of the utility model is provided with a stirring blade at the lower end of the branch pipe, so that the mixed raw materials can be further stirred by the stirring blade at the lower end of the branch pipe during the rotation of the sintering furnace and the reciprocating swing of the mixed raw materials in the sintering furnace, thereby fully improving the contact adequacy of the various raw materials in the mixed raw materials. At the same time, the stirring blade expands the contact area of ​​the lower end of the branch pipe, thereby preventing the branch pipe from being damaged by the impact of the reciprocating motion of the mixed raw materials, dispersing the contact force between the branch pipe and the mixed raw materials, and reducing the equipment maintenance cost;

[0024] (4) The lithium iron phosphate sintering device of the utility model can balance the internal air pressure of the sintering furnace by setting a ventilation valve, thereby preventing the internal pressure of the sintering furnace from being too high due to the high temperature environment of the sintering process, and reducing the risk of the sintering furnace bursting due to the thermal expansion of the internal gas;

[0025] In summary, the lithium iron phosphate sintering device involved in the utility model can effectively improve the contact and mixing sufficiency of the mixed raw materials, increase the contact area between the mixed raw materials and oxygen in the sintering furnace during sintering, and achieve the purpose of improving the reaction efficiency.

[0026] The utility model is suitable for the production and processing of lithium iron phosphate and is used for the sintering of lithium iron phosphate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0029] Figure 2 It is a front cross-sectional view of the sintering furnace according to an embodiment of the utility model.

[0030] In the figure: 1. sintering furnace; 2. main pipe; 3. branch pipe; 4. stirring blade; 5. ventilation valve; 6. feed pipe; 7. discharge pipe; 8. base; 9. servo motor; 10. tank trough; 11. slideway; 12. electric heating film; 13. connecting seat a; 14. connecting seat b. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0032] Embodiment A lithium iron phosphate sintering device

[0033] like Figure 1 As shown in the figure, the present embodiment relates to a lithium iron phosphate sintering device, which includes a base 8 and a sintering furnace 1, a connecting seat a 13 and a connecting seat b 14 are fixed on the top side of the base 8, a rotating shaft rotatably connected to the top of the connecting seat a 13 and the connecting seat b 14 is fixed at the center position of both ends of the sintering furnace 1, and a servo motor 9 is fixed on the top of the connecting seat b 14;

[0034] The sintering device also includes a heating device, which includes a main pipe 2 and a branch pipe 3. The air inlet end of the main pipe 2 passes through the center of one end of the sintering furnace 1 and penetrates the connecting seat a 13 at the same time, and the other end is sealed and close to the other end of the sintering furnace 1; the branch pipe 3 is arranged at the lower end of the main pipe 2; the main pipe 2 and the branch pipe 3 are both built with cavities and are connected; the outside of the main pipe 2 and the branch pipe 3 are covered with an electric heating film 12;

[0035] Preferably, a stirring blade 4 is fixedly provided at the lower end of the branch pipe 3 away from the main pipe 2;

[0036] A feed pipe 6 is provided on the side wall of one end of the sintering furnace 1, and a discharge pipe 7 is provided at the bottom of the other end;

[0037] A ventilation valve 5 is provided at the top of the sintering furnace 1;

[0038] A gas tank groove is provided at one end of the base 8 , and the gas tank groove includes a slide 11 and a tank placement groove 10 .

[0039] When using this embodiment, the oxygen tube is connected to the main pipe 2, oxygen is introduced, the feed pipe 6 is opened, the mixed raw material for sintering lithium iron phosphate is introduced into the sintering furnace 1, the servo motor 9 and the electric heating film 12 are started, so that the sintering furnace 1 rotates back and forth. During the reaction, the electric heating film 12 heats the main pipe 2 and the branch pipe 3, so that the heated oxygen is released from the branch pipe 3 and fully contacts with the mixed raw material. At the same time, during the rotation of the sintering furnace 1, each time the mixed raw material passes through the lower end of the branch pipe 3, it will be stirred again by the stirring blade 4 to further improve the contact adequacy between the raw materials. After the reaction is completed, the discharge port 7 is opened to discharge the reacted material from the sintering furnace 1 to enter the next processing step.

[0040] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium iron phosphate sintering device, comprising a base (8) and a sintering furnace (1), characterized in that: A connecting seat a (13) and a connecting seat b (14) are fixed on the top side of the base (8); a rotating shaft rotatably connected to the top of the connecting seat a (13) and the connecting seat b (14) is fixed at the center positions of both ends of the sintering furnace (1); a servo motor (9) is fixed at the top of the connecting seat b (14); the sintering device also includes a heating device, the heating device includes a main pipe (2) and a branch pipe (3); the air inlet end of the main pipe (2) passes through the center of one end of the sintering furnace (1) and penetrates the connecting seat a (13), and the other end is sealed and close to the other end of the sintering furnace (1); the branch pipe (3) is arranged at the lower end of the main pipe (2); the main pipe (2) and the branch pipe (3) are both provided with cavities and are connected; the outside of the main pipe (2) and the branch pipe (3) are coated with an electric heating film (12).

2. The lithium iron phosphate sintering device according to claim 1, characterized in that: A stirring blade (4) is fixedly provided at the lower end of the branch pipe (3) away from the main pipe (2).

3. The lithium iron phosphate sintering device according to claim 1, characterized in that: A feed pipe (6) is provided on the side wall at one end of the sintering furnace (1), and a discharge pipe (7) is provided at the bottom at the other end.

4. The lithium iron phosphate sintering device according to claim 1, characterized in that: A ventilation valve (5) is provided at the top of the sintering furnace (1).

5. The lithium iron phosphate sintering device according to claim 1, characterized in that: A gas tank groove is provided at one end of the base (8), and the gas tank groove comprises a slideway (11) and a tank placement groove (10).

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