Lithium iron phosphate positive electrode material roasting device

Abstract

The utility model discloses a lithium iron phosphate positive electrode material roasting device in the technical field of lithium iron phosphate processing, which comprises a barrel, a screw and a heater, the bottom end of the barrel is connected with a supporting piece, a hollow cavity is arranged in the barrel, and the upper part of the barrel is in threaded connection with a temperature measuring probe. According to the utility model, the screw rod is arranged in the cylinder body, the screw rod is driven by the servo motor at one end, the heating pipe is arranged in the blind hole cavity in the screw rod, the heating pipe heats the screw rod, the interior of the cylinder body and the screw rod are integrally heated, materials are heated and sintered, and the screw rod is in contact with a lithium iron phosphate precursor for heating, so that the heating speed is high. Due to the fact that the screw rotates to push the lithium iron phosphate precursor, the lithium iron phosphate precursor is continuously overturned and evenly heated in the overturning and heating process, it is guaranteed that the precursor reacts completely in the sintering process, the lithium iron phosphate precursor can rub with one another in the overturning process, large-particle combinations are automatically smashed, and the uniformity of product particles is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of lithium iron phosphate processing technology, specifically a calcination device for lithium iron phosphate cathode materials. Background Technology

[0002] Environmental pollution and energy shortage are two major challenges facing countries worldwide. To improve the ecological environment and conserve energy, new energy technologies have received considerable attention and development. Currently, common new energy sources such as solar, nuclear, wind, and ocean energy have the advantages of abundant reserves and clean, environmentally friendly operation. Therefore, how to convert the collected energy into rechargeable batteries for storage is crucial. Lithium-ion batteries are an important rechargeable battery technology. The sintering of ternary cathode material precursors is mostly carried out in roller furnaces and pusher furnaces, which employ conventional static stacking sintering methods.

[0003] However, in existing furnace-type sintering processes, the materials are heated by thermal radiation from heating devices during the calcination process. However, the thermal radiation heat transfer efficiency is low, and the way the materials are stacked and placed results in problems such as easy under-sintering, long reaction time, incomplete emission of volatiles, and low product quality uniformity. Based on this, this utility model designs a lithium iron phosphate cathode material calcination device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a method for manufacturing lithium iron phosphate cathode material, and to sinter the lithium iron phosphate cathode material manufactured by this method through a sintering device, so as to solve the problems mentioned above, such as low heat transfer efficiency due to thermal radiation, easy under-sintering during the sintering process caused by the material stacking method, long reaction time, incomplete emission of volatiles, and low product quality uniformity.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lithium iron phosphate cathode material calcination apparatus includes a cylinder, a screw, and a heater. A support is connected to the bottom of the cylinder, and a hollow cavity is formed inside the cylinder. A temperature probe is threadedly connected to the top of the cylinder. A feed hopper is welded to the upper end of one end of the cylinder, containing lithium iron phosphate cathode material precursor powder. An outlet is opened at the lower end of the other end of the cylinder for discharging the calcined lithium iron phosphate. The screw is inserted into the hollow cavity of the cylinder, and a blind hole is formed in the center of the screw. The connecting end of the screw passes through the feed hopper end of the cylinder and is bolted to a servo motor. The servo motor is bolted to the support. The heater is connected to a heating tube and the temperature probe via wiring. The heating tube is bolted to the outlet end of the cylinder and passes through the blind hole in the center of the screw. The heater supplies power to the heating tube, which in turn heats the screw.

[0007] As a further embodiment of this utility model: the discharge end of the feed hopper is conical, and the discharge end of the feed hopper is connected to the top of the cylinder.

[0008] As a further embodiment of this utility model: multiple temperature measuring probes are provided, and the temperature measuring probes are equidistantly distributed at the upper end of the cylinder.

[0009] As a further embodiment of this utility model: the temperature probe is a screw-type thermocouple temperature probe.

[0010] As a further embodiment of this utility model: the connecting end of the screw is integrally formed with a material blocking ring, and the diameter of the material blocking ring matches the cavity diameter of the cylinder.

[0011] As a further embodiment of this utility model: a sealing body is installed between the cylinder and the heating tube, the heating tube is installed through the sealing body, and the sealing body is threadedly connected to one end of the cylinder.

[0012] As a further embodiment of this utility model: one end of the sealing body is connected to a hollow limiting sleeve, and one end of the limiting sleeve is engaged with the free end of the screw.

[0013] As a further embodiment of this utility model: the outer surface of the cylinder is covered with an insulating sleeve, the length of which matches the length of the cylinder.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, a screw is installed inside the cylinder, driven by a servo motor at one end. A heating tube is installed in a blind cavity inside the screw. The heater connects the heating tube to a high-frequency current via a connecting wire, converting electrical energy into heat energy. The heating tube heats the screw, heating the inside of the cylinder and the screw as a whole. The servo motor drives the screw to rotate at a uniform speed. As the material moves forward inside the cylinder, it is heated and sintered. The screw contacts and heats the lithium iron phosphate precursor, resulting in rapid heating. Because the screw rotates and pushes the lithium iron phosphate precursor, the precursor is continuously rotated and heated evenly during the tumbling heating process, ensuring complete reaction of the precursor during sintering. During the tumbling process, the lithium iron phosphate precursor rubs against each other, automatically crushing large particle aggregates and ensuring uniform particle size in the product.

[0016] 2. In this utility model, a sealing body is installed between the cylinder and the heating tube to seal the connection between the cylinder and the heating tube, thereby preventing heat loss and improving heat utilization. One end of the sealing body is connected to a hollow limiting sleeve, and the limiting sleeve is fixedly connected through the sealing body. The limiting sleeve engages and limits the free end of the screw, making the screw rotation more stable. The screw and the limiting sleeve are matched and engaged. The sealing body, the limiting sleeve and the free end of the screw form a whole, preventing lithium iron phosphate from being discharged through the opening at the end of the cylinder and ensuring that all lithium iron phosphate is discharged through the discharge port. Attached Figure Description

[0017] Figure 1 This is a rear-view three-dimensional structural diagram of the roasting apparatus of this utility model;

[0018] Figure 2 This is a front-view three-dimensional structural diagram of the roasting apparatus of this utility model;

[0019] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 This is a bottom-view three-dimensional structural diagram of the roasting apparatus of this utility model;

[0021] Figure 5 This is a schematic diagram of the overall exploded structure of the roasting device of this utility model;

[0022] Figure 6 This is a schematic cross-sectional view of the roasting apparatus of this utility model.

[0023] Figure 7 For the present utility model Figure 6 Enlarged structural diagram at point B.

[0024] In the diagram: 1. Support component; 2. Cylinder; 3. Feed hopper; 4. Discharge port; 5. Servo motor; 6. Screw; 7. Material blocking ring; 8. Heater; 9. Heating tube; 10. Temperature probe; 11. Sealing body; 12. Limiting sleeve; 13. Insulation sleeve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1: Please refer to Figures 1-7In this embodiment of the present invention, a calcination apparatus for preparing lithium iron phosphate cathode material includes a cylinder 2, a screw 6, and a heater 8. A support member 1 is connected to the bottom end of the cylinder 2. A hollow cavity is formed inside the cylinder 2. A temperature probe 10 is threadedly connected to the top of the cylinder 2. A feed hopper 3 is welded to the upper end of one end of the cylinder 2, and lithium iron phosphate cathode material precursor powder is placed inside the feed hopper 3. An outlet 4 is opened at the lower end of the other end of the cylinder 2 for discharging the calcined lithium iron phosphate. The screw 6 is inserted and installed inside the hollow cavity of the cylinder 2. A blind hole is opened in the center of the screw 6, and the connecting end of the screw 6 penetrates through the cylinder 2. The feed hopper 3 is connected to the screw 6 via bolts to the connecting end, and the servo motor 5 is bolted to the support 1. The heater 8 is connected to the heating tube 9 and the temperature probe 10 via wiring. The heating tube 9 is bolted to the discharge port 4 of the cylinder 2 and passes through the blind hole in the center of the screw 6. The heater 8 supplies power to the heating tube 9, and the heating tube 9 heats the screw 6. During the calcination operation of lithium iron phosphate cathode material, the lithium iron phosphate cathode material is placed in the feed hopper 3, and the screw 6 is installed in the cylinder 2. The screw 6 is driven by the servo motor 5 at one end, and the heating tube 9 is installed in the blind hole in the screw 6. Inside the cavity, heater 8 connects to heating tube 9 via a connecting wire, allowing high-frequency current to be supplied. Heating tube 9 converts electrical energy into heat energy, heating screw 6. The entire interior of cylinder 2 and screw 6 are heated. Temperature is detected by temperature probe 10. Once the overall heating temperature reaches 820℃, servo motor 5 is activated, causing screw 6 to rotate at a constant speed. Material falls from hopper 3 and is propelled by the rotating screw 6. During this forward movement within cylinder 2, the material is heated and sintered. Screw 6 contacts and heats the lithium iron phosphate precursor, resulting in rapid heating. Since screw 6 rotates to drive the lithium iron phosphate precursor, during the tumbling heating process, the lithium iron phosphate precursor is continuously tumbling and heated evenly, ensuring that the precursor reaction is complete during the sintering process. During the tumbling process, the lithium iron phosphate precursor can rub against each other, automatically crushing large particle aggregates and ensuring the uniformity of product particles. After sintering, it can be discharged and fall through the discharge port 4 of cylinder 2, and the gas generated during sintering can be discharged. The baking time in cylinder 2 is short, and the product production efficiency is high. The sintering time of lithium iron phosphate precursor in cylinder 2 is determined by the speed of servo motor 5, and the sintering time is highly adjustable and easy to operate.

[0027] Preferred, such as Figure 1 and Figure 6 As shown, the discharge end of the feed hopper 3 is conical. The discharge end of the feed hopper 3 is connected to the top of the cylinder 2. The conical discharge end of the feed hopper 3 facilitates the concentration of the bottom of the lithium iron phosphate precursor. The feed hopper 3 connected to the top of the cylinder 2 allows the material discharged from the discharge end to fall directly above the screw 6, which facilitates the pushing of the screw 6.

[0028] Preferred, such as Figure 1 and Figure 2As shown, multiple temperature probes 10 are provided and are equidistantly distributed on the upper end of the cylinder 2. Multi-point temperature detection is performed by multiple equidistantly distributed temperature probes 10 on the cylinder 2, and the heater is continuously adjusted to make the overall heating of the device uniform, thus ensuring the uniformity of high-temperature sintering of the lithium iron phosphate precursor.

[0029] Furthermore, the temperature probe 10 is a screw-type thermocouple temperature probe (K-M6-1000, Subote Technology Co., Ltd.). The screw-type thermocouple temperature probe is easy to install on the upper end of the cylindrical body 2 and is also suitable for high-temperature detection.

[0030] Preferred, such as Figure 7 As shown, the connecting end of the screw 6 is integrally formed with a material blocking ring 7. The diameter of the material blocking ring 7 matches the cavity diameter of the cylinder 2. The material blocking ring 7 integrally formed at one end of the screw 6 blocks the lithium iron phosphate precursor falling from the feed hopper 3 on one side, preventing leakage on one side.

[0031] Preferred, such as Figure 1 and Figure 5 As shown, the cylinder 2 is covered with an insulation sleeve 13. The length of the insulation sleeve 13 matches the length of the cylinder 2. The cylinder 2 is externally insulated by the insulation sleeve 13 of the matching length to avoid heat loss and energy waste.

[0032] Example 2: As an example of the second embodiment of this utility model, such as Figures 5-7 As shown, a sealing body 11 is installed between the cylinder 2 and the heating tube 9. The heating tube 9 is installed through the sealing body 11. The sealing body 11 is threaded to one end of the cylinder 2. The sealing body 11 seals the connection between the cylinder 2 and the heating tube 9 to prevent heat loss and improve heat utilization.

[0033] Preferred, such as Figure 7 As shown, one end of the sealing body 11 is connected to the hollow limiting sleeve 12, and one end of the limiting sleeve 12 is snapped into the free end of the screw 6. The limiting sleeve 12 is fixedly connected through the sealing body 11. The limiting sleeve 12 snaps into and limits the free end of the screw 6, making the screw 6 rotate more smoothly. The screw 6 and the limiting sleeve 12 are matched and snapped together. The sealing body 11, the limiting sleeve 12 and the free end of the screw 6 form a whole, preventing lithium iron phosphate from being discharged through the end opening of the cylinder 2, and allowing lithium iron phosphate to be discharged through the discharge port 4.

[0034] The working principle of this utility model is as follows: The electrical equipment of the device is connected to an external power source. The lithium iron phosphate cathode material is placed in the feed hopper 3. A screw 6 is installed inside the cylinder 2. The screw 6 is driven by a servo motor 5 at one end. A heating tube 9 is installed in the blind cavity inside the screw 6. A heater 8 connects to the heating tube 9 via a connecting wire. The heating tube 9 converts electrical energy into heat energy, heating the screw 6. The inside of the cylinder 2 and the screw 6 are heated as a whole. The temperature is detected by a temperature probe 10. After the overall heating temperature of the device reaches the target temperature, the servo motor 5 is turned on, causing the servo motor 5 to drive the screw 6 to rotate at a constant speed. The material in the feed hopper 3 falls down and is pushed by the uniformly rotating screw 6. During the forward propulsion process within the cylinder 2, the material is heated and sintered. The screw 6 contacts and heats the lithium iron phosphate precursor, resulting in rapid heating. As the screw 6 rotates and pushes the lithium iron phosphate precursor, the precursor is continuously rotated and heated evenly during the tumbling heating process, ensuring complete reaction of the precursor during sintering. The tumbling process allows the lithium iron phosphate precursor to rub against each other, automatically crushing large particle aggregates and ensuring uniformity of product particles. After sintering, the material is discharged through the outlet 4 of the cylinder 2, allowing the gas generated during sintering to be discharged. The calcination time within the cylinder 2 is short, resulting in high product production efficiency. The sintering time of the lithium iron phosphate precursor within the cylinder 2 is determined by the speed of the servo motor 5, providing strong adjustability and convenient operation.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for calcining a lithium iron phosphate positive electrode material, comprising a barrel (2), a screw (6) and a heater (8), characterized in that: The bottom end of the cylinder (2) is connected to the support member (1), a hollow cavity is arranged inside the cylinder (2), the top of the cylinder (2) is threadedly connected to a temperature measuring probe (10), a feed hopper (3) is welded to the top of one end of the cylinder (2), lithium iron phosphate positive electrode material precursor powder is placed in the feed hopper (3), a discharge port (4) is provided at the bottom of the other end of the cylinder (2), the discharge port (4) is used to discharge the calcined lithium iron phosphate, the screw (6) is inserted and installed in the hollow cavity of the cylinder (2), a blind hole is provided in the center of the screw (6), The connecting end of the screw (6) passes through the feed hopper (3) end of the barrel (2), the connecting end of the screw (6) is bolted to the servo motor (5), the servo motor (5) is bolted to the support (1), the heater (8) is connected to the heating tube (9) and the temperature measuring probe (10) through a line, the heating tube (9) is bolted to the discharge port (4) end of the barrel (2), the heating tube (9) passes through the central blind hole of the screw (6), the heater (8) supplies power to the heating tube (9), and the heating tube (9) heats the screw (6).

2. The lithium iron phosphate positive electrode material calcining device according to claim 1, characterized in that: The discharge end of the feed hopper (3) is conical, and the discharge end of the feed hopper (3) is connected directly above the cylinder (2).

3. The lithium iron phosphate positive electrode material calcining device according to claim 1, characterized in that: A plurality of the temperature measuring probes (10) are provided, and the temperature measuring probes (10) are evenly distributed at the upper end of the cylinder (2).

4. The lithium iron phosphate positive electrode material calcining device according to claim 3, characterized in that: The temperature measuring probe (10) is a screw-type thermocouple temperature measuring probe.

5. The lithium iron phosphate positive electrode material calcining device according to claim 1, characterized in that: A material blocking ring (7) is integrally formed at the connection end of the screw rod (6), and the diameter of the material blocking ring (7) matches the diameter of the cavity of the barrel (2).

6. The lithium iron phosphate positive electrode material calcining device according to claim 1, characterized in that: A sealing body (11) is installed between the cylinder (2) and the heating tube (9), the heating tube (9) is installed through the sealing body (11), and the sealing body (11) is threadedly connected to one end of the cylinder (2).

7. The lithium iron phosphate positive electrode material calcining device according to claim 6, characterized in that: One end of the sealing body (11) is connected to a hollow limiting sleeve (12), and one end of the limiting sleeve (12) is clamped on the free end of the screw rod (6).

8. The device for calcining lithium iron phosphate positive electrode material according to any one of claims 1 to 7, characterized in that: The exterior of the cylinder (2) is covered and connected with a heat-insulating sleeve (13), and the length of the heat-insulating sleeve (13) matches the length of the cylinder (2).

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