A mullite sagger for sintering positive electrode materials of lithium batteries

Abstract

The utility model discloses a mullite sagger for sintering positive electrode materials of lithium batteries, comprising a sagger body and a cover assembly; the top of the sagger body is open, and the cover assembly is driven by a driving assembly to close or open the opening of the sagger body. The utility model can keep the sagger in an open state in a temperature rising zone and a constant temperature zone by arranging a movable sealing cover, which is conducive to the dissipation of moisture and volatile components contained in the material during the temperature rising process. In the cooling zone, the sagger is closed by the sealing cover, and the sagger is in a closed state as a whole, so as to prevent the introduction of oxygen to cause material performance loss or even damage.

Description

Technical Field

[0001] The utility model relates to the technical field of mullite saggers for sintering positive electrode materials of lithium batteries, in particular to a mullite sagger for sintering positive electrode materials of lithium batteries. Background Art

[0002] One of the key processes for positive electrode materials of phosphorus lithium-ion batteries is high-temperature sintering. Various parameters of the high-temperature sintering process are related to various performance indicators of the materials. At present, the most commonly used high-temperature sintering equipment in the industry is the roller kiln. The roller kiln can be divided into three process sections: heating zone, constant temperature zone and cooling zone, which correspond to the three reaction processes of heating, constant temperature reaction and cooling, and finally obtain the positive electrode material with the required performance.

[0003] During the sintering process, the container for materials is often a sagger. At present, the most commonly used in the industry is the mullite sagger with comprehensive performance and cost advantages. In the three process stages of sintering, due to the characteristics of the sagger kiln, the materials will have different reaction states. In the heating zone, during the temperature rise, a large amount of moisture and volatile components contained in the material will be generated. There will be a pressure difference between the inside and outside of the covered sagger, which will make the moisture and volatile components in the material higher, and at the same time affect the safety and life of the sagger and the machine. However, after the material reaches the cooling zone through the heating zone and the constant temperature zone, there will be negative pressure inside the covered sagger due to shrinkage and expansion. A small amount of oxygen may be introduced in the cooling zone or the subsequent transportation section, resulting in material performance loss or even damage.

[0004] In summary, covered saggers will cause great difficulties and potential dangers to the production process due to airtightness reasons. Therefore, the production of positive electrode materials in the industry mostly adopts uncovered saggers. However, uncovered saggers have no ability to prevent foreign matter during the production process and there is a lot of dust, which will also cause a lot of waste of manpower and materials.

[0005] Therefore, a mullite sagger is needed to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a mullite sagger for sintering positive electrode materials of lithium batteries, which adopts a movable cover plate to volatilize the moisture and volatile components contained in the positive electrode materials of the battery during the sintering process, isolate oxygen during cooling, and prevent the material performance from being affected.

[0007] The purpose of the utility model can be achieved through the following technical scheme: a mullite sagger for sintering positive electrode materials of lithium batteries, comprising a sagger body and a cover assembly; the top of the sagger body is open, and the cover assembly is driven by a driving assembly to close or open the opening of the sagger body.

[0008] Furthermore, the cover plate assembly comprises a cover plate body and a sealing cover, the cover plate body is placed on the opening of the sagger body, the bottom surface of the cover plate body is attached to the top surface of the side wall of the sagger body, and an air port is opened in the middle of the cover plate body;

[0009] The sealing cover is connected to the driving assembly, and the sealing cover is driven by the driving assembly to close or open the middle air port of the cover plate body.

[0010] Furthermore, the bottom surface of the cover body has a trapezoidal protrusion, and the top of the top surface of the side wall of the sagger body is provided with a trapezoidal groove corresponding to the trapezoidal protrusion.

[0011] When the cover plate body is placed on the opening of the sagger body, the trapezoidal protrusion is embedded in the corresponding trapezoidal groove.

[0012] Furthermore, the air port of the cover plate body is covered with a high temperature resistant filter.

[0013] Furthermore, the cover plate assembly further comprises a sealing cover insert block, the sealing cover insert block is connected to the top surface of the cover plate body, and the sealing cover insert block and the top surface of the cover plate body form a sealing cover slot;

[0014] The sealing cover is driven by the driving assembly to close the middle air port of the cover plate body, and the sealing cover is inserted into the sealing cover slot.

[0015] Furthermore, the driving assembly comprises a power cylinder, a telescopic rod of the power cylinder is connected to a sealing cover, and the telescopic rod drives the sealing cover to close or open the opening of the sagger body;

[0016] The driving assembly further comprises a plurality of rollers, which are all rotatably connected to the bracket. When the telescopic rod drives the sealing cover to approach or move away from the sagger body, the sealing cover is placed on the rollers.

[0017] Furthermore, the sagger body comprises an upper sagger body and a lower sagger body, the upper sagger body is connected to the lower sagger body, and the top surface of the side wall of the upper sagger body is attached to the bottom surface of the cover plate body.

[0018] Furthermore, the cover plate body, the sealing cover, the sealing cover insert block and the sagger body are all made of mullite, and the high temperature resistant filter screen is made of high temperature resistant stainless steel.

[0019] Furthermore, the high temperature resistant filter screen has a mesh structure, and the mesh area of ​​the high temperature resistant filter screen is 4mm 2 ~10mm 2 .

[0020] Beneficial effects of the utility model:

[0021] 1. The utility model provides a movable sealing cover, which can keep the sagger open in the temperature rising zone and the constant temperature zone. In the process of temperature rising, it is beneficial to the dissipation of moisture and volatile components contained in the material. In the cooling zone, the sagger is closed by the sealing cover, and the sagger is closed as a whole to prevent the introduction of oxygen from causing loss of material performance or even damage.

[0022] 2. The utility model can prevent the reaction material from raising dust and ensure gas circulation by setting a high temperature resistant filter and reasonably adjusting the filter mesh, which can ensure the release of moisture and volatile components contained in the material while reducing material loss and manpower waste during cleaning.

[0023] 3. The mullite sagger of the utility model can better meet the processing requirements of the positive electrode material of the lithium-ion battery and improve the stability of production by providing a movable sealing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the mullite sagger of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the cover plate assembly and the cover plate body of the utility model;

[0026] Figure 3 This is a schematic diagram of the process of the driving assembly of the utility model driving the sealing cover.

[0027] 100, sagger body; 110, upper sagger body; 111, trapezoidal groove; 120, lower sagger body;

[0028] 200, cover plate assembly; 210, cover plate body; 211, trapezoidal protrusion; 220, sealing cover; 221, handle; 230, sealing cover insert block; 231, sealing cover slot;

[0029] 300, high temperature resistant filter;

[0030] 400, driving assembly; 410, power cylinder; 411, telescopic rod; 420, roller; 430, bracket. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] The existing saggers have shortcomings in the production process of lithium-ion battery positive electrode materials. The covered saggers cannot meet the discharge of volatile gases in the heating zone, and the uncovered saggers cannot avoid oxygen infiltration in the cooling zone. The existing uncovered saggers cannot prevent the entry of foreign matter and the waste of materials and manpower caused by dust, resulting in low efficiency and unstable material performance in the production process.

[0033] In order to solve the above problems, the utility model discloses a mullite sagger for sintering positive electrode materials of lithium batteries, such as Figure 1-3 As shown, the sagger body 100 and the cover plate assembly 200 are included.

[0034] Examples, such as Figure 1 As shown, the sagger body 100 is made of mullite material and is in a square box shape. The sagger body 100 has only an opening on the top, and the bottom surface and surrounding side walls are closed.

[0035] The cover assembly 200 includes a cover body 210, a sealing cover 220 and a sealing cover insert block 230, all of which can be made of mullite. The cover body 210 is in a plate shape, and has four trapezoidal protrusions 211 at the edge of the bottom surface of the cover body 210. The corresponding sagger body 100 has trapezoidal grooves 111 corresponding to the trapezoidal protrusions 211 on the top surface of the side walls around the sagger body 100. When the cover body 210 is placed on the opening of the sagger body 100, the bottom surface of the cover body 210 fits the top surface of the side walls around the sagger body 100. At this time, the trapezoidal protrusions 211 are respectively embedded in the corresponding trapezoidal grooves 111, so that the cover body 210 can be stably connected to the sagger body 100 without being dislocated, and good air tightness can be maintained between the cover body 210 and the sagger body 100.

[0036] An air port is provided in the middle of the cover body 210, and the air port is covered with a high-temperature resistant filter screen 300. The high-temperature resistant filter screen 300 can be made of high-temperature resistant stainless steel material. The high-temperature resistant filter screen 300 is fixedly connected to the cover body 210, and can be fixedly connected to the cover body 210 by embedding or riveting. When the high-temperature resistant filter screen 300 is fixed on the cover body 210, it does not affect the sealing cover 220 to close or open the air port. By setting the high-temperature resistant filter screen 300, it can be ensured that during high-temperature production, the moisture and volatile components in the sagger can be smoothly discharged through the high-temperature resistant filter screen. At the same time, the high-temperature resistant filter screen can intercept dust, reduce material loss and manpower waste during cleaning.

[0037] Furthermore, the high temperature resistant filter adopts a mesh structure, and the single mesh area of ​​the high temperature resistant filter can be 4mm 2 ~10mm 2 , which can be adjusted as needed.

[0038] like Figure 2As shown, the sealing cover insert block 230 is fixed on the top surface of the cover plate body 210, and the sealing cover insert block 230 is The sealing cover 220 has an L-shaped cross section, wherein the opening side faces the sealing cover 220, the sealing cover insertion block 230 has an L-shaped cross section, the sealing cover insertion block 230 and the top surface of the cover body 210 form a sealing cover slot 231, when the sealing cover 220 is driven by the driving assembly 400 to close the opening of the cover body 210, the sealing cover 220 is inserted into the sealing cover slot 231, and the sealing cover slot 231 can effectively fix the sealing cover 220 to prevent the sealing cover 220 from sliding in the kiln.

[0039] The structure of the drive assembly 400 can be as follows: Figure 3 In the structure shown, the driving assembly 400 is arranged in the cooling zone of the sintering kiln, and is mainly used to drive the sealing cover 220 to close the opening of the cover plate body 210, effectively preventing uneven heating of the material and the entry of external oxygen, thereby ensuring the material performance.

[0040] The driving assembly 400 includes a power cylinder 410 and multiple rollers 420. The power cylinder 410 can be an electric cylinder, an oil cylinder or an air cylinder, etc. The multiple rollers 420 are all rotatably connected to the bracket 430. The sealing cover 220 is placed on the rollers 420. The rollers 420 roll to assist the sealing cover 220 in translation. When it is necessary to close the opening of the cover body 210, the telescopic rod 411 of the power cylinder 410 extends out to push the handle 221 at the top of the sealing cover 220. The sealing cover 220 is pushed into the sealing cover slot 231 using the handle 221. Through the connection setting, when the sagger is cooled, the telescopic rod 411 of the power cylinder 410 retracts and can also take the sealing cover 220 away from the sealing cover slot 231 to open the opening of the cover body 210.

[0041] Further, such as Figure 1 As shown, to facilitate the manufacture and use of the sagger body, the sagger body can include two parts, namely an upper sagger body 110 and a lower sagger body 120. The upper sagger body 110 is connected to the lower sagger body 120. The upper sagger body 110 is used to connect the cover plate assembly 200. The top surface of the side wall of the upper sagger body 110 is attached to the bottom surface of the cover plate body 210 to maintain good sealing. The lower sagger body 120 is arranged on the conveyor belt of the sintering kiln.

[0042] The bottom surface of the cover body 210 of the utility model has a trapezoidal protrusion 211, which can be firmly connected with the mullite sagger to ensure air tightness and stability; a high-temperature resistant filter screen is arranged on the cover body 210 to prevent dust from the reaction material and ensure gas circulation; the sealing cover 220 can be movably placed in the sealing cover slot 231 and move relative to the cover body 210, thereby closing or opening the high-temperature resistant filter screen 300.

[0043] When the sagger is placed in the temperature rising zone and the constant temperature zone, the sealing cover 220 is not required, ensuring that the moisture and volatile components in the sagger can be discharged smoothly through the high temperature resistant filter net. At the same time, the high temperature resistant filter net can intercept dust, reduce material loss and manpower waste during cleaning; when the sagger is placed in the cooling zone, the sagger is covered by the cover plate assembly 200 to close the air port, reduce material damage caused by oxygen entry, and ensure production safety and stability.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0045] 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", "axial", "radial", "circumferential" 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.

[0046] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A mullite sagger for sintering positive electrode materials of lithium batteries, characterized in that: The invention comprises a sagger body (100) and a cover assembly (200); the top of the sagger body (100) is open, and the cover assembly (200) is driven by a driving assembly (400) to close or open the opening of the sagger body (100).

2. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 1, characterized in that: The cover plate assembly (200) comprises a cover plate body (210) and a sealing cover (220); the cover plate body (210) is placed on the opening of the sagger body (100); the bottom surface of the cover plate body (210) is attached to the top surface of the side wall of the sagger body (100); and an air port is opened in the middle of the cover plate body (210); The sealing cover (220) is connected to the driving assembly (400), and the sealing cover (220) is driven by the driving assembly (400) to close or open the middle air port of the cover plate body (210).

3. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 2, characterized in that: The bottom surface of the cover plate body (210) is provided with a trapezoidal protrusion (211), and the top surface of the side wall of the sagger body (100) is provided with a trapezoidal groove (111) corresponding to the trapezoidal protrusion (211). When the cover plate body (210) is placed on the opening of the sagger body (100), the trapezoidal protrusion (211) is embedded in the corresponding trapezoidal groove (111).

4. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 2, characterized in that: The air port of the cover plate body (210) is covered with a high temperature resistant filter screen (300).

5. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 2, characterized in that: The cover plate assembly (200) further comprises a sealing cover insertion block (230), wherein the sealing cover insertion block (230) is connected to the top surface of the cover plate body (210), and the sealing cover insertion block (230) and the top surface of the cover plate body (210) form a sealing cover slot (231); The sealing cover (220) is driven by the driving assembly (400) to close the middle air port of the cover plate body (210), and the sealing cover (220) is inserted into the sealing cover slot (231).

6. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 2, characterized in that: The driving assembly (400) comprises a power cylinder (410), a telescopic rod (411) of the power cylinder (410) is connected to a sealing cover (220), and the telescopic rod (411) drives the sealing cover (220) to close or open an opening of the sagger body (100); The driving assembly (400) further comprises a plurality of rollers (420), and the plurality of rollers (420) are all rotatably connected to the bracket (430). When the telescopic rod (411) drives the sealing cover (220) to approach or move away from the sagger body (100), the sealing cover (220) is placed on the rollers (420).

7. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 2, characterized in that: The sagger body comprises an upper sagger body (110) and a lower sagger body (120); the upper sagger body (110) is connected to the lower sagger body (120); and the top surface of the side wall of the upper sagger body (110) is attached to the bottom surface of the cover plate body (210).

8. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 4, characterized in that: The cover plate body (210), the sealing cover (220), the sealing cover insert block (230) and the sagger body are all made of mullite, and the high temperature resistant filter screen (300) is made of high temperature resistant stainless steel.

9. The mullite sagger for sintering positive electrode materials of lithium batteries according to claim 4, characterized in that: The high temperature resistant filter screen has a mesh structure, and the mesh area of ​​the high temperature resistant filter screen is 4mm 2 ~10mm 2 .

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