Sintering combined sagger of lithium iron phosphate positive electrode material

Abstract

The utility model discloses a sintering combined sagger for a lithium iron phosphate positive electrode material, which is formed by sequentially overlapping a plurality of sagger bodies from top to bottom, and gaps are formed among the overlapped sagger bodies so as to form heat dissipation and pressure relief channels among the sagger bodies; the box body comprises a body and a corrugated partition plate assembly which is arranged in the body and divides the body into a plurality of cavities. According to the combined sintering saggar, the plurality of saggar bodies are combined in an up-and-down overlapping mode, and the gaps are formed between the adjacent saggar bodies to form heat dissipation and pressure relief channels of the saggar bodies, so that sufficient heat dissipation and gas escape are realized, and the quality of sintered products is improved; meanwhile, the box body is internally divided into a plurality of cavities by adopting the corrugated partition plate assemblies, so that the box body is heated uniformly, heat dissipation is timely, and the index stability of finished products is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sintering saggers, and particularly relates to a sintering composite sagger for lithium iron phosphate cathode materials. Background Technology

[0002] Lithium iron phosphate (LFP) cathode materials possess advantages such as excellent thermal stability, long cycle life, electrochemical stability, and environmental friendliness, making them one of the most ideal cathode materials in the power battery field. Mainstream LFP battery cathode materials are produced using a solid-state synthesis method, which involves calcining the material in a sagger within a kiln. This process and equipment are simple, making it the most commonly used synthesis method in industrial production.

[0003] The structural design of the sagger directly affects the calcination process of the cathode material, significantly influencing the degree of reaction, particle development, and carbon layer coating. Furthermore, uneven heating and poor heat dissipation during actual sintering can negatively impact the performance of the finished product. When the core material temperature inside the sagger is too high, the material risks oxidation and spoilage. In addition, the lithium iron phosphate cathode material precursor is leveled in the sagger, sealed with a lid, and then fed into the kiln for high-temperature calcination via external light. During sintering, the precursor undergoes a solid-phase reaction, producing gases such as H2O and CO2. If the sagger is not depressurized in time, sudden gas overflow may occur, leading to powder spraying, affecting product quality, wasting material, and causing the sprayed material to adhere to the sintering furnace, thus affecting its operation.

[0004] In the development of the lithium battery cathode material industry, although technicians have improved the sagger by using a cross-shaped partition to physically separate the material inside the sagger, its purpose is to prevent material caking during sintering, which could lead to blockage when the rollers break. Furthermore, this also considers the urgent problems that need to be solved in the calcination of lithium iron phosphate cathode material precursors.

[0005] Based on this, we now study and design a sintering composite sagger for calcining lithium iron phosphate cathode materials to simultaneously solve the problems of sufficient heat dissipation and pressure relief of the composite sintering sagger. Utility Model Content

[0006] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a combined sintering sagger for calcining lithium iron phosphate cathode materials, so as to simultaneously solve the problems of sufficient heat dissipation and pressure relief of the combined sintering sagger, and increase the sintering amount during the sintering process and reduce costs.

[0007] Technical solution: The present invention relates to a sintered composite sagger for lithium iron phosphate cathode material, which is composed of several sagger bodies stacked one on top of the other, with gaps formed between the stacked sagger bodies to form heat dissipation and pressure relief channels between the sagger bodies.

[0008] The casing includes a body and a corrugated partition assembly disposed within the body to divide it into several cavities.

[0009] Furthermore, the corrugated partition assembly of the sintered composite sagger is composed of several horizontal corrugated partitions and several vertical corrugated partitions combined in a cross pattern.

[0010] Furthermore, the upper side wall of the sintering composite sagger body is provided with a connecting groove, and the upper sides of the sides of the several horizontal corrugated partitions and the several vertical corrugated partitions are provided with connecting protrusions that match the connecting groove.

[0011] Furthermore, the corrugated partition assembly of the sintered composite sagger is used to divide the body into 4-cell or 9-cell cavities.

[0012] Furthermore, the transverse corrugated partition of the sintering composite sagger is a U-shaped corrugated partition or a V-shaped corrugated partition; the vertical corrugated partition is a U-shaped corrugated partition or a V-shaped corrugated partition.

[0013] Furthermore, the sintering composite sagger has slots on several of the horizontal corrugated partitions and several of the vertical corrugated partitions to allow them to be stacked in a cross shape.

[0014] Furthermore, several of the transverse corrugated partitions of the sintered composite sagger are located above the vertical corrugated partitions.

[0015] Furthermore, the bottom of each individual saggar of the sintered composite saggar is provided with connecting corners, so that when the saggar is connected to the top of the adjacent bottom saggar, a gap is formed.

[0016] Furthermore, the top of each individual saggar body of the sintering composite saggar is provided with anti-collision corners extending horizontally around its circumference.

[0017] Beneficial effects: Compared with the prior art, the advantages of this utility model are as follows: This combined sintering crucible is designed for lithium iron phosphate cathode materials. By combining several crucibles in an up-and-down stacking manner, and forming gaps between adjacent crucibles, a heat dissipation and pressure relief channel is formed, which realizes sufficient heat dissipation and gas escape, thereby improving the quality of lithium iron phosphate cathode materials. At the same time, the crucible is divided into several cavities by a corrugated partition assembly. The corrugated partitions separate the powder in the crucible, making it heated evenly and dissipating heat in a timely manner. The sintering process can be carried out according to the original design, improving the stability of the finished product indicators. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the combined sintering sagger of this utility model (without corrugated partitions inside);

[0019] Figure 2 This is a top view (U-shaped 4-grid) of a single box body of this utility model;

[0020] Figure 3 This is a top view (U-shaped 9-grid) of a single box body of this utility model;

[0021] Figure 4 This is a top view (V-shaped 4-grid) of a single box body of this utility model;

[0022] Figure 5 This is a top view (V-shaped 9-grid) of a single box body of this utility model;

[0023] Figure 6 This is a schematic diagram of the U-shaped transverse partition of this utility model;

[0024] Figure 7 This is a schematic diagram of the U-shaped vertical partition of this utility model. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model relates to a combined sagger for the sintering of lithium iron phosphate cathode materials. It is formed by stacking several sagger bodies 1 vertically, preferably 3-5 sagger bodies 1. The stacked sagger bodies 1 form gaps to create heat dissipation and pressure relief channels. This is achieved by providing connecting angles 8 around the bottom of each sagger body 1. These connecting angles 9 connect to the top of adjacent sagger bodies 1, creating gaps 2 due to height differences. Figure 1 As shown, this forms a heat dissipation gap and pressure relief channel between the combined stacked box 1, which improves the product quality and stability of the sintered product.

[0027] Specifically, a single housing 1 includes a main body 3 and several corrugated partition assemblies disposed within the main body 3. These corrugated partition assemblies divide the interior of the main body 3 into several cavities, such as a 4-compartment or 9-compartment structure. Figures 2 to 5As shown. The corrugated partition assembly includes several horizontal corrugated partitions 4 and several vertical corrugated partitions 5. The horizontal corrugated partitions 4 and vertical corrugated partitions 5 intersect to form a cross shape, thereby dividing the interior of the main body 3. For example, a set of horizontal corrugated partitions 4 and a set of vertical corrugated partitions 5 can be used to divide the interior into a 4-cell cavity. For example, two sets of horizontal corrugated partitions 4 and two sets of vertical corrugated partitions 5 can be used to divide the interior into a 9-cell cavity. The cross-section of the horizontal corrugated partitions 4 and the vertical corrugated partitions 5 can be U-shaped or V-shaped. Corresponding to the arrangement of the two, the connection between the horizontal corrugated partitions 4 and the vertical corrugated partitions 5 is formed by slots 8. When the horizontal corrugated partition 4 is located above the vertical corrugated partition 5, a slot 8 is provided at the lower end of the horizontal corrugated partition 4, and a slot 8 is provided at the upper end of the vertical corrugated partition 5, such as... Figures 6 to 7 As shown.

[0028] Furthermore, the connection between the corrugated partition assembly and the main body 3 can be achieved through a movable connection formed by grooves 6 and protrusions 7. Specifically, grooves 6 are provided on the main body 3 at the connection points, and protrusions 7 are provided at both ends of the horizontal corrugated partition 4 or the vertical corrugated partition 5, forming a mating connection. The grooves 6 on the main body can also serve as pressure relief ports, facilitating the discharge of waste gas generated during the positive electrode material reaction into the crucible and reducing material spraying. Additionally, multiple grooves 6 can be pre-installed in the uppermost crucible to create channels for gas escape when the uppermost crucible is sealed with a cover plate.

[0029] The combined sagger of this invention, using a stacked method, increases the amount of positive electrode material sintered in a single pass, improves sintering efficiency, and reduces costs. Furthermore, the stacked method, with gaps formed at the stacking points, allows for ample heat dissipation and gas escape, thus improving the quality of the sintered product.

Claims

1. A sintering assembly for lithium iron phosphate cathode material, characterized in that, The sintering assembly box is composed of a plurality of box bodies (1) stacked one above another, and the plurality of box bodies (1) are stacked to form gaps (2) between the box bodies (1) to form heat dissipation and pressure relief channels between the box bodies (1); The box body (1) comprises a body (3) and a corrugated partition assembly arranged in the body (3) to divide the body (3) into a plurality of cavities.

2. The sintering assembly basket of claim 1, wherein, The corrugated partition assembly is composed of a plurality of transverse corrugated partitions (4) and a plurality of vertical corrugated partitions (5).

3. The sintering assembly basket of claim 2, wherein, A connecting groove (6) is formed in the upper end of the side wall of the body (3), and the upper end of the two sides of each of the plurality of transverse corrugated partitions (4) and the plurality of vertical corrugated partitions (5) is provided with a connecting protrusion (7) matched with the connecting groove (6).

4. The sintering assembly basket of claim 1, wherein, The corrugated partition assembly divides the body (3) into a 4x4 grid cavity or a 9x9 grid cavity.

5. The sintering assembly basket of claim 2, wherein, The transverse corrugated partition (4) is a U-shaped or V-shaped cross-section corrugated partition, and the vertical corrugated partition (5) is a U-shaped or V-shaped cross-section corrugated partition.

6. The sintering assembly basket of claim 2, wherein, A slot (8) is formed in each of the plurality of transverse corrugated partitions (4) and the plurality of vertical corrugated partitions (5) to cross and stack them into a "cross" shape.

7. The sintering assembly basket of claim 6, wherein, The plurality of transverse corrugated partitions (4) are located above the vertical corrugated partitions (5).

8. The sintering assembly basket of claim 1, wherein, A connecting corner (9) is arranged around the bottom end of the body (3) of the single box body (1) to form a gap (2) when the connecting corner is connected to the top end of the adjacent box body (1).

9. The sintering assembly basket of claim 1, wherein, A collision-avoiding corner (10) is arranged around the top end of the body (3) of the single box body (1).

Images