Lithium iron phosphate premixing tank with bottom vent

Abstract

This utility model discloses a lithium iron phosphate premixed tank with a bottom vent, relating to the field of battery technology. The utility model includes a tank body, a jacket, a head, a ring tube, and a rotating shaft. A conical hopper is fixedly connected to the bottom of the tank body. A jacket is fixedly connected to the upper middle part of the conical hopper and the lower middle part of the tank body. A head is fixed to the top of the tank body. A ring tube is provided on the outer side of the portion of the conical hopper extending beyond the jacket. A series of air pipes arranged in a ring array are fixedly connected to the inner side of the ring tube. The end of the air pipes away from the ring tube is fixedly connected to the conical hopper. A connecting pipe is fixedly connected to the outer side of the ring tube. A rotating shaft is rotatably connected through the head. The bottom end of the rotating shaft extends into the junction of the tank body and the conical hopper, and a stirring paddle is fixed to the bottom end of the rotating shaft. This utility model, by setting up a tank body, conical hopper, ring tube, air pipes, rotating shaft, stirring paddle, and jacket, solves the problems of local agglomeration due to insufficient fluidity in traditional closed stirring structures and the lack of temperature control function in premixed tanks.

Description

Technical Field

[0001] This utility model belongs to the field of battery-related technology, and in particular relates to a lithium iron phosphate premixed tank with a bottom vent. Background Technology

[0002] Lithium iron phosphate (LFP) batteries, also known as lithium iron phosphate lithium-ion batteries, are a type of battery that uses olivine-structured lithium iron phosphate as the positive electrode and carbon-based (graphite) materials as the negative electrode, separated by a separator. Lithium ions are transferred through an organic electrolyte. During charging, lithium ions migrate from the facets of the lithium iron phosphate crystals to the crystal surface. Under the influence of an electric field, they enter the electrolyte, pass through the separator, and then migrate through the electrolyte to the surface of the graphite crystals, where they are embedded in the graphite lattice. During discharging, lithium ions are extracted from the graphite crystals, enter the electrolyte, pass through the separator, and then migrate through the electrolyte to the surface of the lithium iron phosphate crystals, where they are re-embedded into the lithium iron phosphate lattice. Lithium iron phosphate is not a single component; it is formed by mixing multiple components. However, the actual premixing process of lithium iron phosphate has the following drawbacks: In the preparation of lithium iron phosphate materials, the premixing process is one of the key steps. It is necessary to fully mix raw materials such as lithium source, iron source, phosphorus source, as well as chelating agent, solvent, etc. in the premixing tank. Traditional premixing tanks are mostly closed stirring structures. When the raw materials are mixed in the tank, they are prone to local agglomeration due to insufficient fluidity, which affects the performance consistency of the subsequent lithium iron phosphate materials. Secondly, a certain temperature needs to be maintained during the premixing process of lithium iron phosphate materials. If the temperature is too high, the material performance may be greatly reduced. Conventional premixing tanks usually do not have temperature control functions. Utility Model Content

[0003] The purpose of this utility model is to provide a lithium iron phosphate premixing tank with a bottom vent. By setting up a tank body, a cone hopper, a ring pipe, a gas pipe, a rotating shaft, a stirring paddle, and a jacket, it solves the problems that traditional closed stirring structures may cause local agglomeration due to insufficient fluidity, and that the premixing tank does not have a temperature regulation function.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a lithium iron phosphate premixed tank with a bottom vent, comprising a tank body, a jacket, a head, an annular tube, and a rotating shaft. A conical hopper is fixedly connected through the bottom of the tank body. A jacket is fixedly connected to the upper middle part of the conical hopper and the lower middle part of the tank body. A head is fixedly connected to the top of the tank body. An annular tube is provided on the outer side of the portion of the lower part of the conical hopper that extends out of the jacket. A gas pipe arranged in a ring array is fixedly connected through the inner side of the annular tube. The end of the gas pipe away from the annular tube is fixedly connected through the conical hopper. A connecting pipe is fixedly connected through the outer side of the annular tube. The head is rotatably connected through a rotating shaft, the bottom end of which extends into the junction of the tank and the cone, and a stirring paddle is fixed to the bottom end of the rotating shaft.

[0005] Furthermore, a water inlet pipe is fixedly connected to the lower part of the jacket, and a water outlet pipe is fixedly connected to the top of the jacket.

[0006] Furthermore, the outer side of the cone bucket is fixed with legs arranged in a circular array, and the end of the leg away from the cone head passes through the lower part of the jacket and extends out. The connection between the leg and the jacket is welded and sealed.

[0007] Furthermore, a discharge pipe is fixed to the bottom end of the cone hopper, and a ball valve is installed on the discharge pipe.

[0008] Furthermore, a bracket is fixed at the top center of the end cap, and a motor is fixed at the top of the bracket. The output shaft of the motor is connected to the top of the rotating shaft via a coupling.

[0009] Furthermore, a solid material pipe and a liquid material pipe are respectively fixed through the end caps on both sides of the support, and a breather valve is installed on the end cap on the front side of the support.

[0010] This utility model has the following beneficial effects: This invention solves the problem of localized agglomeration that may occur in traditional closed mixing structures due to insufficient fluidity by setting up a tank, cone, ring pipe, air pipe, rotating shaft, and stirring paddle. The air source is connected to the ring pipe, and gas (such as air, inert gas, or reactive gas) is introduced into the cone through the air pipe. The gas diffuses upward from the bottom of the cone, which can effectively break up the agglomeration of raw materials and enhance the mixing uniformity of solid-liquid and solid-solid materials. Combined with the rotation of the rotating shaft and the stirring paddle, the raw materials are stirred, which improves the overall mixing uniformity and prevents a large amount of material from quickly depositing at the bottom of the cone and clogging the pipes.

[0011] This invention solves the problem that the lack of temperature control function in the premixing tank affects the performance of lithium iron phosphate materials after premixing by setting a jacket. The temperature inside the tank is controlled by introducing 10°C condensate into the jacket through the water inlet pipe, and the temperature inside the tank is controlled at 35°C. The condensate then flows out through the water outlet pipe, achieving cyclic temperature control.

[0012] This invention has strong process adaptability. The gas pipe can be continuously supplied with a small amount of gas or a large amount of gas according to the material deposition rate, which expands the flexibility of the premixing process.

[0013] This utility model has a simple and practical structure. It only adds a bottom gas pipe and a ring pipe structure to the traditional premix tank, which is easy to modify. The gas pipe is located at the bottom of the cone hopper, which does not affect the discharge of raw materials, avoids the risk of material accumulation, and does not affect the cooling of the jacket. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0015] Figure 1 A perspective view of a lithium iron phosphate premixing tank with a bottom vent. Figure 2 for Figure 1 A diagram showing the state of the middle jacket after it has been cut open. Figure 3 for Figure 1 Diagram showing the state of the middle jacket, tank body, and conical hopper after cross-section; Figure 4 for Figure 1 Structural diagram after the jacket is removed; Figure 5 for Figure 1 A three-dimensional view viewed from below; Figure 6 This is a sectional view of the jacket; Figure 7 This is a diagram showing the connection between the ductus conus and the trachea after cross-section.

[0016] Figure label: 1. Tank body; 101. Conical hopper; 1011. Support leg; 102. Discharge pipe; 1021. Ball valve; 2. Jacket; 201. Water inlet pipe; 202. Water outlet pipe; 3. End cap; 301. Support; 302. Motor; 303. Solid feed pipe; 304. Liquid feed pipe; 305. Breathing valve; 4. Ring pipe; 401. Connecting pipe; 402. Air pipe; 5. Rotating shaft; 501. Agitator. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] Please see Figure 1-7 As shown, this utility model is a lithium iron phosphate premixed tank with a bottom vent hole, including a tank body 1, a jacket 2, a head 3, an annular pipe 4 and a rotating shaft 5. A conical hopper 101 is fixedly connected to the bottom of the tank body 1. The upper middle part of the conical hopper 101 and the lower middle part of the tank body 1 are fixedly connected to the jacket 2. The top of the tank body 1 is fixedly connected to the head 3. An annular pipe 4 is provided on the outer side of the part of the lower part of the conical hopper 101 that extends out of the jacket 2. A gas pipe 402 arranged in a ring array is fixedly connected to the inner side of the annular pipe 4. The end of the gas pipe 402 away from the annular pipe 4 is fixedly connected to the conical hopper 101. A connecting pipe 401 is fixedly connected to the outer side of the annular pipe 4. Tank 1 and cone 101 are connected as one unit. Tank 11 is a vertical cylindrical structure. The cone angle of cone 101 is 60°. Both are made of 316L stainless steel to meet the requirements of corrosion resistance and cleanliness. The inner wall is sprayed with a 0.1mm thick polytetrafluoroethylene anti-stick coating to prevent the lithium iron phosphate raw material from adhering. The ring pipe 4 is placed outside the bottom of cone 101. A gas source (such as air, inert gas or reactive gas) is connected through the connecting pipe 401 outside the ring pipe 4. Gas is then introduced into cone 101 through gas pipe 402. The gas diffuses upward from the bottom of cone 101, which can effectively break the agglomeration of raw materials and enhance the mixing uniformity of solid-liquid and solid-solid raw materials. A rotating shaft 5 is rotatably connected through the end cap 3. The bottom end of the rotating shaft 5 extends into the junction of the tank body 1 and the cone 101, and a stirring paddle 501 is fixed at the bottom end of the rotating shaft 5. The rotation of the rotating shaft 5 drives the stirring paddle 501 to rotate, which in turn agitates and mixes the materials in the tank 1 and the cone 101. Combined with the gas input through the air pipe 402, it achieves rapid, efficient and uniform mixing.

[0019] A water inlet pipe 201 is fixedly connected to the lower part of the jacket 2, and a water outlet pipe 202 is fixedly connected to the top of the jacket 2. The temperature inside the tank is controlled by introducing 10°C condensate into the jacket 2 through the inlet pipe 201, keeping the temperature inside the tank at 35°C. The condensate then flows out through the outlet pipe 202, achieving cyclic temperature control. Alternatively, a PT100 temperature sensor (not shown in the figure) can be added to the middle of the tank for real-time monitoring of the liquid temperature.

[0020] The outer side of the cone bucket 101 is fixed with support legs 1011 arranged in a ring array, and the end of the support leg 1011 away from the cone head passes through the lower part of the sleeve 2 and extends out. The connection between the support leg 1011 and the sleeve 2 is welded and sealed. The outrigger 1011 is used to support and stabilize the cone bucket 101 and the tank body 1, so that they are stably supported on the ground. The connection between the outrigger 1011 and the jacket 2 is welded to maintain a seal and fixation, so as not to affect the operation of the condensate in the jacket 2.

[0021] The bottom end of the cone hopper 101 is fixed with a discharge pipe 102, and a ball valve 1021 is installed on the discharge pipe 102; the mixed material is discharged through the discharge pipe 102, and the ball valve 1021 is used to control the opening and closing of the discharge pipe 102.

[0022] A bracket 301 is fixed at the top center of the end cap 3, and a motor 302 is fixed at the top of the bracket 301. The output shaft of the motor 302 is connected to the top of the rotating shaft 5 via a coupling. The motor 302 (power 7.5kW, speed 100rpm) is mounted on the bracket 301 and drives the rotating shaft 5 (diameter φ60mm) to rotate, as well as the paddle-type stirring paddle 501 (diameter φ500mm) fixed at the bottom of the rotating shaft 5 to rotate, which is used to drive the agitation and mixing of the raw materials in the tank 1.

[0023] Solid material pipe 303 and liquid material pipe 304 are respectively fixed through the end caps 3 on both sides of the support 301. A breather valve 305 is installed on the end cap 3 on the front side of the support 301. Solid material pipe 303 and liquid material pipe 304 are used to add solid materials and liquid materials respectively. Breather valve 305 is used to balance the air pressure inside and outside the tank 1.

[0024] The specific working principle of this utility model is as follows: First, a gas source (such as air, inert gas, or reactive gas) is connected through the connecting pipe 401 outside the ring pipe 4. Then, gas is introduced into the cone 101 through the gas pipe 402. The gas diffuses upward from the bottom of the cone 101. Subsequently, solid materials and liquid materials are added through the solid material pipe 303 and the liquid material pipe 304, respectively, and enter the tank 1 and the cone 101. With the motor 302 driving the rotating shaft 5 to rotate, and the paddle-type stirring paddle 501 fixed at the bottom of the rotating shaft 5 rotating, the raw materials in the tank 1 are agitated and mixed. Combined with the gas diffuses upward from the bottom of the cone 101, a fast, efficient, and uniform mixing process is achieved. During this process, 10°C condensate is introduced into the jacket 2 through the water inlet pipe 201 to control the temperature inside the tank, keeping the temperature inside the tank at 35°C. The condensate then flows out from the water outlet pipe 202 to achieve circulating temperature control. Finally, the ball valve 1021 is opened, and the mixed material is discharged from the discharge pipe 102.

[0025] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A lithium iron phosphate premixed tank with a bottom vent, comprising a tank body (1), a jacket (2), a cap (3), a ring pipe (4), and a rotating shaft (5), characterized in that: A conical hopper (101) is fixedly connected to the bottom of the tank (1). A jacket (2) is fixedly connected to the upper middle part of the conical hopper (101) and the lower middle part of the tank (1). A cap (3) is fixedly connected to the top of the tank (1). A ring pipe (4) is provided on the outer side of the part of the lower part of the conical hopper (101) that extends out of the jacket (2). A gas pipe (402) arranged in a ring array is fixedly connected to the inner side of the ring pipe (4). The end of the gas pipe (402) away from the ring pipe (4) is fixedly connected to the conical hopper (101). A connecting pipe (401) is fixedly connected to the outer side of the ring pipe (4). The end cap (3) is rotatably connected to a rotating shaft (5). The bottom end of the rotating shaft (5) extends into the junction of the tank body (1) and the cone (101), and a stirring paddle (501) is fixed at the bottom end of the rotating shaft (5).

2. The lithium iron phosphate premixing tank with bottom vent as described in claim 1, characterized in that: The lower part of the jacket (2) is fixed with a water inlet pipe (201), and the top of the jacket (2) is fixed with a water outlet pipe (202).

3. A lithium iron phosphate premixing tank with a bottom vent as described in claim 1, characterized in that: The outer side of the cone bucket (101) is fixed with legs (1011) arranged in a ring array, and the end of the legs (1011) away from the cone head passes through the lower part of the sleeve (2) and extends out. The connection between the legs (1011) and the sleeve (2) is welded and sealed.

4. A lithium iron phosphate premixing tank with a bottom vent as described in claim 1, characterized in that: The bottom end of the cone hopper (101) is fixed with a discharge pipe (102), and a ball valve (1021) is installed on the discharge pipe (102).

5. A lithium iron phosphate premixing tank with a bottom vent as described in claim 1, characterized in that: A bracket (301) is fixed at the top center of the end cap (3), and a motor (302) is fixed at the top of the bracket (301). The output shaft of the motor (302) is connected to the top of the rotating shaft (5) via a coupling.

6. A lithium iron phosphate premixing tank with a bottom vent as described in claim 5, characterized in that: Solid material pipe (303) and liquid material pipe (304) are respectively fixed through the end cap (3) on both sides of the bracket (301), and a breather valve (305) is installed on the end cap (3) on the front side of the bracket (301).

Images