Forming device for realizing efficient sintering of composite ferric sodium pyrophosphate material
By using graphite cassette and conical hole punching device in the sintering equipment of composite sodium ferrous pyrophosphate material, the problems of heat transfer effect and insufficient production capacity are solved, and low-temperature and efficient sintering and performance improvement are achieved.
Patent Information
- Application Number
- CN202421693338.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The existing composite sodium ferrous pyrophosphate sintering equipment has insufficient heat transfer effect and production capacity, resulting in the inability to meet the requirements of product performance and the inability to increase the unit production capacity of roller kilns.
The graphite cassette and conical punching device are used to improve the heat transfer area and heat balance of the material by setting up a graphite partition and a conical punching mold in the graphite cassette.
The efficient sintering of composite sodium ferrous pyrophosphate material under low temperature conditions has been achieved, which improves the sintering capacity and product performance, and significantly reduces production costs.
Smart Images
Figure CN223013559U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a manufacturing device for energy battery materials, in particular to a pre-sintering forming device for the production of sodium ferric pyrophosphate phosphate composite materials Background Art
[0002] In recent years, with the rapid development of the new energy battery industry, the requirements for the sintering of battery materials in the production and manufacturing process have become increasingly high. Especially for the sintering of sodium ferric pyrophosphate phosphate composite materials, new requirements have been put forward for equipment and processes
[0003] In the existing technology, after the precursor of sodium ferric pyrophosphate phosphate composite material is loaded into the sagger, the material in the sagger is leveled by a leveling machine, and then passes through a nine-square grid shaping machine to divide the surface layer of the material into a nine-square grid. The depth of the nine-square grid section is 0.5 cm and the width is 0.2 cm to improve the heat transfer effect of the material. Since the sodium ferric pyrophosphate phosphate composite material is sensitive to the sintering temperature, it cannot form a phase at a low temperature and decomposes at a high temperature, resulting in a decrease in product performance. The allowable temperature difference for sintering is <100 °C. The cutting surface of the nine-square grid shaping machine is narrow and the depth is insufficient. During the material transfer process, due to the action of vibration, the shaped material will collapse, resulting in a decrease in the heat transfer effect of the material. The product performance cannot meet the requirements during sintering, and the loading capacity during the sintering process of the roller hearth kiln cannot be increased, restricting the unit production capacity of the roller hearth kiln. The improved method is that after the precursor of sodium ferric pyrophosphate phosphate composite material is loaded into the sagger, the material in the sagger is leveled by a leveling machine, and then passes through a conical die drilling machine to form a conical hole in the middle of the material in the sagger, and then sintered after increasing the heat transfer area. Although the conical hole in this way will increase the heat transfer area of the material, due to the increase of the conical hole, the loading height of the material increases and the heat transfer distance increases, resulting in insufficient heating of the middle layer material, the product performance cannot meet the requirements, and the loading capacity during the sintering process of the roller hearth kiln cannot be increased, which also restricts the unit production capacity of the roller hearth kiln Summary of the Utility Model
[0004] In order to solve the above problems, the utility model provides a high-efficiency sintering device for sodium ferric pyrophosphate phosphate composite materials, which can not only solve the problem of insufficient heating of the middle layer material, but also solve the problem of increasing the heat transfer area and achieving uniform heating to improve the production capacity. To achieve the above purpose, the technical solution disclosed by the utility model is as follows
[0005] A forming device for realizing efficient sintering of sodium ferric pyrophosphate composite material, comprising: a conveying mechanism, a loading mechanism, a leveling mechanism, a punching mechanism and a graphite crucible; the graphite crucible is used for containing the material of the sodium ferric pyrophosphate composite material; the conveying mechanism is used for conveying the graphite crucible; the loading mechanism is used for loading the material into the graphite crucible; the leveling mechanism is used for leveling the surface of the material loaded in the graphite crucible; the punching mechanism is used for punching the surface of the material leveled in the graphite crucible; the loading mechanism, the leveling mechanism and the punching mechanism are arranged on the conveying mechanism; the graphite crucible is of a trough structure, and the bottom of the trough is divided into a plurality of material accommodating areas by intersecting graphite partitions; the punching mechanism is provided with a plurality of downwardly extending conical punching dies, and the punching dies are adapted to the number and positions of the material accommodating areas, and the punching dies are used for punching the material placed in the material accommodating areas.
[0006] Preferably, the graphite crucible is of an integral casting structure, and the graphite partition is of a non-detachable structure.
[0007] Preferably, the graphite crucible is provided with 4 material accommodating areas; the punching mechanism is provided with 4 punching dies; the 4 punching dies correspond to the 4 material accommodating areas.
[0008] Preferably, the tip of the punching die corresponds to the central position of most of the material accommodating areas.
[0009] Preferably, 4 motors are arranged on the punching die, and the motors drive the punching die to rotate and punch.
[0010] Preferably, a cylinder is arranged in the conveying mechanism;
[0011] The cylinder is located below the punching mechanism. When the graphite crucible is conveyed to the position of the punching mechanism, the cylinder pushes the graphite crucible to move upward, and the punching mechanism is inserted into the graphite crucible to perform punching operation on the material.
[0012] Preferably, a plurality of photoelectric sensors are arranged in the conveying mechanism;
[0013] The photoelectric sensors are respectively arranged at the loading mechanism, the leveling mechanism and the punching mechanism, and are used for sensing the position of the graphite crucible.
[0014] The beneficial effects of the present utility model are: by utilizing the characteristic that graphite is easy to conduct heat, the graphite crucible with graphite partitions added in the crucible is combined with the conical punching device, so as to increase the heat receiving area of the material and realize efficient sintering of the sodium ferric pyrophosphate composite material under low temperature conditions. Description of the Drawings
[0015] The accompanying drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model.
[0016] Figure 1A It is a three-dimensional structure schematic diagram of an embodiment of the present application;
[0017] Figure 1B For the present application Figure 1A is a schematic diagram of the transverse side structure;
[0018] Figure 1C For the present application Figure 1A is a schematic diagram of the side structure;
[0019] Figure 2A It is a three-dimensional structure schematic diagram of the graphite crucible of the present application;
[0020] Figure 2B is a schematic diagram of the side structure of the graphite crucible of the present application;
[0021] Figure 2C is a schematic diagram of the front structure of the graphite crucible of the present application;
[0022] Figure 3A It is a three-dimensional structure schematic diagram of the conical punching die of the present invention;
[0023] Figure 3B is a schematic diagram of the side structure of the conical punching die of the present invention;
[0024] Figure 3C is a schematic diagram of the front structure of the conical punching die of the present invention;
[0025] Figure 4A It is a schematic diagram of the charging curve of the comparative test of the sample button cell half-cell of the present invention;
[0026] Figure 4B It is a schematic diagram of the discharging curve of the comparative test of the sample button cell half-cell of the present invention. Detailed implementation manners
[0027] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the drawings in the specification.
[0028] As Figure 1A 、 Figure 1B and Figure 1C shown, it is a three-dimensional structure schematic diagram of a forming device of an embodiment of the present application.
[0029] As Figure 1AShown in the figure is a forming device 100 for realizing the efficient sintering of sodium ferric pyrophosphate composite materials, including a conveying mechanism 101, a loading mechanism 102, a leveling mechanism 103, a punching mechanism 104, and a graphite crucible 110; the graphite crucible 110 is used to hold the materials of the sodium ferric pyrophosphate composite materials and is transported by the conveying mechanism 101.
[0030] The conveying mechanism 101 is a roller-type conveyor belt, and the conveying mechanism 101 is used to convey the graphite crucible 110; the loading mechanism 102 is used to load materials into the graphite crucible 110; the leveling mechanism 103 is used to level the surface of the materials loaded in the graphite crucible 110; the punching mechanism 104 is used to punch the surface of the leveled materials in the graphite crucible 110; the loading mechanism 102, the leveling mechanism 103, and the punching mechanism 104 are sequentially arranged on the conveying mechanism 101; the positions of the loading mechanism 102, the leveling mechanism 103, and the punching mechanism 104 are sequentially set as a loading station 141, a leveling station 142, and a punching device station 143, and photoelectric sensors 131, 132, and 133 are respectively arranged at each station to sense the position of the graphite crucible 110. When the graphite crucible 110 is sensed to reach this station, the roller-type conveyor belt stops moving, and the loading mechanism 102, the leveling mechanism 103, or the punching mechanism 104 at this station performs loading, leveling, or punching operations on the graphite crucible 110. In Figure 1B As can be seen in the figure, a cylinder 150 is provided in the conveying mechanism 101; the cylinder 150 is located below the punching mechanism 104. When the graphite crucible 110 is transported to the position of the punching mechanism 104, the cylinder 150 pushes the graphite crucible 110 upward, and the cone of the punching mechanism 104 inserts into the graphite crucible 110 to punch the materials.
[0031] As Figure 2A 、 Figure 2B 、 Figure 2C shown, the graphite crucible 110 is a trough-type, one-piece casting and cutting structure, with an open upper end surface. As Figure 2C shown, the front is approximately square (other shapes are also possible). The bottom of the trough is divided into several material accommodation areas 114 by intersecting graphite partitions 112. The graphite partitions 112 are non-detachable structures and are integrally formed with the bottom and sides of the graphite crucible 110. In this embodiment, the graphite crucible 110 is provided with 4 material accommodation areas 114; in fact, according to the size of the graphite crucible 110 or actual needs, a larger graphite crucible 110 can be set up and the graphite crucible 110 can be divided into 6, 8, 10 or other numbers of material accommodation areas 114 by the graphite partitions 112, as long as the number and position of the subsequent punching mechanism 104 are set to adapt to the punching die 310. As can be seen from Figure 2A the figure, the height of the graphite partition 112 is lower than the surrounding sides of the graphite crucible 110; and as Figure 2BAs shown, a notch 202 is provided in the middle of the four peripheral side edges of the graphite crucible 110, forming a structure with a lower middle and higher ends, which is conducive to the operation of the leveling mechanism 103 or the punching mechanism 104.
[0032] As Figure 3A , Figure 3B , Figure 3C As shown, the punching mechanism 104 is provided with 4 downwardly extending conical punching dies 310. The punching dies 310 are adapted to the number and position of the material accommodating areas 114. The tip of the punching die 310 corresponds to the center position of most of the material accommodating areas 114. When the graphite crucible 110 is transported to the punching device station 143, the air cylinder 150 pushes the graphite crucible 110 upward, and the punching dies 310 punch the material placed in the material accommodating areas 114. There are 4 motors 320 on the punching dies 310, and the motor drive 320 drives the punching dies 310 to rotate and punch to facilitate punching and extraction from the material.
[0033] During use, the graphite crucible 110 receives the compound sodium pyrophosphate iron phosphate precursor through the loading mechanism 102 at the loading station 141, is transported to the leveling station 142 through the conveying mechanism 101, and the material in the graphite crucible 110 is leveled by the leveling mechanism 103 at the leveling station 142. Subsequently, it reaches the punching device station 143. Driven by the air cylinder 150, the graphite crucible 110 is lifted, and at the same time, the punching mechanism 104 starts the motor drive 320 to drive the punching dies 310 to rotate until the punching dies 310 penetrate into the material interior, and a conical hole is formed on the material surface. Compared with the plane, the heat transfer area is increased, so as to achieve the purpose of improving the material consistency, sintering productivity, and product performance of the compound sodium pyrophosphate iron phosphate under low-temperature sintering.
[0034] At the same time, because graphite has the characteristic of good thermal conductivity, its thermal conductivity is higher than that of the compound sodium pyrophosphate iron phosphate precursor. Also, due to the addition of a "cross" graphite partition 114 in the bottom space of the graphite crucible 110, the graphite crucible 110 is cut from an integrally connected space into 4 separate material accommodating areas 114. The compound sodium pyrophosphate iron phosphate precursor is added to these four separate spaces, and then a conical hole is formed in the middle of the material in each corresponding space using the conical punching die 310 to increase the heat transfer area. By adding the graphite partition 114 and the conical hole, the heat transfer efficiency and heat transfer area are improved, so that the loading capacity of the graphite crucible 110 for the compound sodium pyrophosphate iron phosphate precursor during sintering is increased from 2 - 4 kg to 6 - 8 kg. When using the low-temperature sintering process without increasing the sintering temperature, the productivity is increased by at least 50%, and at the same time, the material performance is not reduced, achieving efficient sintering and significantly reducing the production cost.
[0035] Comparative Example 1: Sodium ferric pyrophosphate phosphate complex was sintered using a conventional graphite crucible (without the graphite partition 114). The loading amount of the crucible was 6 kg, and the sintering temperature was between 450 - 550 °C. The specific charge capacity of the product during the first charge was 98.18 mAh / g, and the specific discharge capacity during the first discharge was 94.56 mAh / g.
[0036] Example 1: Sodium ferric pyrophosphate phosphate complex was sintered using the graphite crucible 110 and the punching device 310 of the present invention. The loading amount of the crucible was 6 kg, and the sintering temperature was between 450 - 550 °C. After sintering, the specific charge capacity of the product during the first charge was 112.92 mAh / g, and the specific discharge capacity during the first discharge was 102.42 mAh / g.
[0037] Comparative Example 2: Sodium ferric pyrophosphate phosphate complex was sintered using a conventional graphite crucible (without the graphite partition 114). The loading amount of the crucible was 6 kg, and the sintering temperature was between 550 - 650 °C. The specific charge capacity of the product during the first charge was 94.98 mAh / g, and the specific discharge capacity during the first discharge was 86.92 mAh / g.
[0038] Example 2: Sodium ferric pyrophosphate phosphate complex was sintered using the graphite crucible 110 and the punching device 310 of the invention. The loading amount of the crucible was 6 kg, and the sintering temperature was between 650 - 650 °C. After sintering, the first charge capacity of the product was 77.21 mAh / g, and the specific discharge capacity during the first discharge was 75.81 mAh / g.
[0039] As Figure 4A shown, comparing Comparative Example 1 with Example 1, at the same sintering temperature, the charge and discharge capacities of Example 1 are both higher than those of Comparative Example 1. The reason is that NFPP can form a pure phase when sintered at 500 °C, indicating that when Example 1 is sintered using the graphite crucible 110 and the punching device 310 of the invention, the heat transfer efficiency is better. Compared with Comparative Example 1, the crystal phase of the sodium ferric pyrophosphate phosphate complex product generated is purer, and the capacity of the coin-type half-cell is higher.
[0040] As Figure 4B shown, comparing Comparative Example 2 with Example 2, at the same sintering temperature, the charge and discharge capacities of Example 2 are both lower than those of Comparative Example 2. The reason is that NFPP decomposes when sintered at 600 °C, resulting in the formation of impurity phases, indicating that when Example 2 is sintered using the graphite crucible 110 and the punching device 310 of the invention, the heat transfer efficiency is better, the sodium ferric pyrophosphate sodium product produced has more impurity phases, and the capacity of the coin-type half-cell is lower.
[0041] The reason why the capacity of Example 2 is lower than that of Comparative Example 2 is that the heat transfer efficiency of the heat transfer material in Example 2 is high, resulting in a relatively high actual sintering temperature of the material, and the product decomposes to generate impurity phases. Comparative Example 1, Example 1, Comparative Example 2, and Example 2 fully illustrate that the sintering device of the present invention can achieve low-temperature and high-efficiency sintering of materials, improve the sintering production capacity, and improve the product performance at the same time.
[0042] The above examples are only examples of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and changes can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.
Claims
1. A molding device (100) for realizing efficient sintering of composite phosphate sodium iron pyrophosphate material, characterized in that include: A conveying mechanism (101), a charging mechanism (102), a leveling mechanism (103), a punching mechanism (104) and a graphite sagger (110); The graphite sagger (110) is used to contain the composite phosphate sodium iron pyrophosphate material; The conveying mechanism (101) is used to convey the graphite sagger (110); The loading mechanism (102) is used to load the material into the graphite sagger (110); The leveling mechanism (103) is used to level the surface of the material loaded into the graphite sagger (110); The punching mechanism (104) is used to punch holes on the surface of the material that has been leveled in the graphite sagger (110); The loading mechanism (102), the leveling mechanism (103) and the punching mechanism (104) are arranged on the conveying mechanism (101); The graphite sagger (110) is a trough structure, and the bottom of the trough is divided into a plurality of material containing areas (114) by crossed graphite partitions (112); The punching mechanism (104) is provided with a plurality of conical punching dies (310) extending downward, the punching dies (310) being adapted to the number and position of the material holding areas (114), and the punching dies (310) are used to punch holes in the material placed in the material holding areas (114).
2. The forming device (100) according to claim 1, characterized in that: The graphite sagger (110) is an integrated casting structure, and the graphite partition plate (112) is a non-detachable structure.
3. The forming device (100) according to claim 1, characterized in that: The graphite sagger (110) is provided with four material containing areas (114); The punching mechanism (104) is provided with four punching dies (310); The four punching dies (310) correspond to the four material containing areas (114).
4. The forming device (100) according to claim 3, characterized in that: The cone tip of the punching die (310) corresponds to the center position of most of the material containing areas (114).
5. The forming device (100) according to claim 3, characterized in that: The punching die (310) is provided with four motors, and the motors drive the punching die (310) to rotate and punch holes.
6. The forming device (100) according to claim 1, characterized in that: A cylinder (150) is provided in the conveying mechanism (101); The cylinder (150) is located below the punching mechanism (104); when the graphite sagger (110) is transferred to the position of the punching mechanism (104), the cylinder pushes the graphite sagger (110) to move upward, and the punching mechanism (104) is inserted into the graphite sagger (110) to perform a punching operation on the material.
7. The forming device (100) according to claim 1, characterized in that: A plurality of photoelectric sensors (131, 132, 133) are arranged in the conveying mechanism (101); The photoelectric sensors (131, 132, 133) are respectively arranged at the loading mechanism (102), the leveling mechanism (103) and the punching mechanism (104), and are used to sense the position of the graphite sagger (110).