Lithium iron phosphate precursor slurry flash evaporation device

Abstract

The utility model discloses a lithium iron phosphate precursor slurry flash evaporation device which comprises a pretreatment assembly and a flash evaporation assembly, the pretreatment assembly comprises an auxiliary stock bin, a filtering channel and a demagnetizing channel, and the feeding end of the auxiliary stock bin faces the discharging end of the previous procedure; the discharging end of the auxiliary stock bin is sequentially connected with the filtering channel and the demagnetizing channel. The flash evaporation assembly comprises a main bin and a flash evaporation main machine, an inlet of the main bin is connected with the demagnetizing channel, and an outlet of the main bin is connected with the flash evaporation main machine. The flash evaporation device disclosed by the utility model has the functions of intercepting foreign matters and removing magnetism, and solves the technical problems that the production of lithium iron phosphate materials is not continuous and the labor intensity and danger of workshop operators are increased because foreign matters exist in a main machine of an existing flash evaporation device and have to be cleaned by stopping the flash evaporation device.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium iron phosphate material manufacturing, in particular to a lithium iron phosphate precursor slurry flash evaporation device. Background Art

[0002] Lithium iron phosphate material is one of the most promising positive electrode materials in the current lithium-ion secondary battery field. With the large-scale popularization of electric vehicles and electrochemical energy storage, the demand for lithium iron phosphate materials has also increased. In the existing industrial preparation process of lithium iron phosphate, the flash drying method does not require complex equipment and process flow, and has the advantages of high production efficiency and low cost and is widely used. However, the main unit of the existing flash evaporation device is relatively closed. If foreign matter from the upstream process enters the main unit, it will collide with the high-speed dispersing machine of the flash evaporation main unit, which will not only produce abnormal noise, but also cause damage to the flash evaporation main unit; at the same time, the foreign matter that enters will also precipitate on the negative electrode side of the battery during the battery charging and discharging process and form a magnetic metal element, which has the risk of piercing the diaphragm, causing great hidden dangers to battery safety and reducing the electrochemical and safety performance of the battery. Therefore, foreign matter that enters the flash evaporation main unit needs to be cleaned in time, and the existing cleaning method often requires shutdown and cooling before cleaning, which not only affects the production capacity, but also causes the production of lithium iron phosphate materials to be unconnected, and also increases the labor intensity and danger of workshop operators.

[0003] In summary, it is necessary to design a lithium iron phosphate precursor slurry flash evaporation device with foreign matter interception and demagnetization functions to prevent foreign matter from the upstream process from entering the flash evaporation host, thereby eliminating the need to stop the machine for cleaning and ensuring the continuity of production. Utility Model Content

[0004] The utility model aims to provide a flash evaporation device for lithium iron phosphate precursor slurry, which has foreign matter interception and demagnetization functions, and solves the technical problems that the existing flash evaporation device has foreign matter in the main machine and has to be shut down for cleaning, resulting in the lack of connectivity in the production of lithium iron phosphate materials and increased labor intensity and danger for workshop operators.

[0005] The utility model adopts the following technical solutions to achieve the above technical objectives:

[0006] A lithium iron phosphate precursor slurry flash evaporation device comprises a pre-treatment component and a flash evaporation component, wherein the pre-treatment component comprises an auxiliary material bin, a filtering channel and a demagnetization channel, the feeding end of the auxiliary material bin faces the unloading end of the previous process, and the discharging end of the auxiliary material bin is connected to the filtering channel and the demagnetization channel in sequence; the flash evaporation component comprises a main material bin and a flash evaporation main unit, the inlet of the main material bin is connected to the demagnetization channel, and the outlet of the main material bin is connected to the flash evaporation main unit.

[0007] Furthermore, the pre-processing component also includes weighing modules arranged on both sides of the auxiliary silo.

[0008] Furthermore, the pre-processing component also includes an impact air hammer arranged on both sides of the auxiliary material bin, and the impact air hammer is located at the lower part of the weighing module.

[0009] Furthermore, the auxiliary silo is composed of a first auxiliary silo and a second auxiliary silo, the feed end of the first auxiliary silo faces the discharge end of the previous process, one end of the second auxiliary silo has a large diameter and the other end has a small diameter, the large-diameter end of the second auxiliary silo is connected to the discharge end of the first auxiliary silo, and the small-diameter end of the second auxiliary silo is connected to the filtering channel;

[0010] Wherein, the weighing modules are arranged on both sides of the first auxiliary material bin, and the impact air hammer is arranged on both sides of the second auxiliary material bin.

[0011] Furthermore, a cleaning manhole is formed on the side of the second auxiliary silo.

[0012] Furthermore, the pre-treatment component also includes a first connecting member, and two ends of the first connecting member are respectively connected to the second auxiliary silo and the filtering channel.

[0013] Furthermore, the pre-treatment component also includes a second connecting member, and two ends of the second connecting member are respectively connected to the demagnetization channel and the main silo.

[0014] Furthermore, it also includes a controller, which is electrically connected to the weighing module, the impact air hammer and the flash evaporation host respectively.

[0015] Furthermore, a screen is laid in the filter channel.

[0016] Furthermore, a demagnetization grid is laid in the demagnetization channel.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model provides a lithium iron phosphate precursor slurry flash evaporation device, which is equipped with a pre-treatment component before feeding. The material discharged from the previous process first enters the auxiliary material bin, then passes through the filter channel and the demagnetization channel in turn to enter the main material bin of the flash evaporation component, and finally enters the flash evaporation main unit for drying. In this process, the material is filtered and demagnetized through the filter channel and the demagnetization channel, which can effectively prevent foreign matter and magnetic substances from entering the flash evaporation main unit, thereby avoiding damage to the flash evaporation main unit and the generation of magnetic metal single substances, and there is no need to shut down the flash evaporation device for cleaning, which ensures the continuity of production and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the flash evaporation device of the utility model;

[0020] Figure 2 It is a plan view of the screen described in the utility model;

[0021] Figure 3 It is a plan view of the demagnetization grid described in the utility model.

[0022] 100, pre-treatment component, 110, auxiliary material bin, 111, first auxiliary material bin, 112, second auxiliary material bin, 1121, cleaning manhole, 120, filtering channel, 121, screen, 130, demagnetization channel, 131, demagnetization grid, 140, first connecting piece, 150, second connecting piece, 160, weighing module, 170, impact hammer;

[0023] 200, flash steam component, 210, main material bin, 220, flash steam main engine;

[0024] 300. Belt conveyor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] Please also read Figure 1-3 As shown, the utility model proposes a flash evaporation device for lithium iron phosphate precursor slurry, including a pre-treatment component 100 and a flash evaporation component 200, wherein the flash evaporation component 200 is a flash evaporation device commonly used in the art, including a main silo 210 and a flash evaporation host 220 connected, however, since the main silo 210 is a closed container and does not have an interception function, foreign matter from the upstream process may enter the flash evaporation host 220 and damage it. Therefore, the utility model is improved on this basis, and a pre-treatment component 100 is additionally provided.

[0027] In the utility model, the pre-treatment component 100 includes an auxiliary material bin 110, a filtering channel 120 and a demagnetization channel 130. The feeding end of the auxiliary material bin 110 faces the unloading end of the previous process, and the discharging end of the auxiliary material bin 110 is connected to the filtering channel 120 and the demagnetization channel 130 in sequence. The demagnetization channel 130 is connected to the main material bin 210. With such arrangement, the material discharged from the previous process first enters the auxiliary material bin 110, then enters the main material bin 210 through the filtering channel 120 and the demagnetizing channel 130, and finally enters the flash evaporation main unit 220 for drying. The material finally entering the flash evaporation main unit 220 can be filtered and demagnetized through the filtering channel 120 and the demagnetizing channel 130, which effectively prevents foreign matter and magnetic substances from entering the flash evaporation main unit 220, thereby avoiding damage to the flash evaporation main unit 220 and the generation of magnetic metal elements, and there is no need to shut down the flash evaporation device for cleaning, thereby ensuring the continuity of production and improving production efficiency; at the same time, it also reduces the labor intensity of workshop operators and reduces the risk; in addition, it also improves the electrochemical performance and safety performance of the battery.

[0028] In one of the preferred embodiments, the auxiliary silo 110 is composed of a first auxiliary silo 111 and a second auxiliary silo 112, the feed end of the first auxiliary silo 111 faces the discharge end of the previous process, one end of the second auxiliary silo 112 has a large diameter and the other end has a small diameter, the large-diameter end of the second auxiliary silo 112 is connected to the discharge end of the first auxiliary silo 111, and the small-diameter end of the second auxiliary silo 112 is connected to the filter channel 120, so that the material of the previous process first enters the first auxiliary silo 111, and then enters the second auxiliary silo 112 from the first auxiliary silo 111, and then enters the filter channel 120 and the demagnetization channel 130 for interception and demagnetization.

[0029] In this embodiment, the material from the previous process is transported to the first auxiliary silo 111 by a belt conveyor 300; the diameter of the second auxiliary silo 112 gradually decreases from the feed end to the discharge end, which is more conducive to the rapid falling of the material under the action of gravity.

[0030] In a preferred embodiment, the filtering channel 120 is a cylindrical structure, and a screen 121 is laid inside the filtering channel 120; the demagnetizing channel 130 is also a cylindrical structure, and a demagnetizing grid 131 is arranged inside the demagnetizing channel 130.

[0031] In a preferred embodiment, the pre-treatment component 100 also includes a first connecting member 140 and a second connecting member 150, and the two ends of the first connecting member 140 are respectively connected to the second auxiliary material bin 112 and the filtering channel 120, and the two ends of the second connecting member 150 are respectively connected to the demagnetization channel 130 and the main material bin 210, that is, the first auxiliary material bin 111 is connected to the second auxiliary material bin 112, the second auxiliary material bin 112 is connected to the filtering channel 120 through the first connecting member 140, the filtering channel 120 is connected to the demagnetization channel 130, and the demagnetization channel 130 is connected to the main material bin 210 through the second connecting member 150.

[0032] In a preferred embodiment, the first connecting member 140 is a flange, and the second connecting member 150 is a flexible connection.

[0033] In a preferred embodiment, the pre-processing component 100 further includes weighing modules 160 disposed on both sides of the auxiliary material bin 110 and an impact air hammer 170 located at the bottom of the weighing module 160 .

[0034] In a preferred embodiment, the weighing modules 160 are arranged on both sides of the first auxiliary material bin 111 , the impact air hammer 170 is arranged on both sides of the second auxiliary material bin 112 , and a cleaning manhole 1121 is formed on the side of the second auxiliary material bin 112 .

[0035] In a preferred embodiment, the flash evaporation device further includes a controller, which is electrically connected to the weighing module 160 , the impact air hammer 170 , and the flash evaporation host 220 , respectively.

[0036] In this embodiment, the controller pre-stores the minimum weight value and the maximum weight value of the material entering the first auxiliary bin 111. When the weighing module 160 detects that the actual weight value of the material entering the first auxiliary bin 111 is ≤ the preset minimum weight value, the belt conveyor 300 starts unloading; when the weighing module 160 detects that the actual weight value of the material entering the first auxiliary bin 111 is ≥ the preset maximum weight value, the belt conveyor 300 stops unloading. At the same time, the controller controls the impact hammer 170 to operate. The material (ferrous phosphate dihydrate filter cake) can be quickly passed through the filtration channel 120 and the demagnetization channel 130 to intercept and demagnetize the foreign matter. The controller will also calculate the time taken for the actual material weight of the first auxiliary silo 111 to change from a preset maximum value to a preset minimum value. If the time is ≥ the preset time, it means that the screen 121 and the demagnetization grid 131 are blocked. The controller will issue an alarm to remind that cleaning is required, and will simultaneously shut down the operation of the flash evaporation host 220 and the belt conveyor 300. At this time, cleaning can be carried out through the cleaning manhole 1121.

[0037] In summary, the utility model provides a lithium iron phosphate precursor slurry flash evaporation device, which can intercept and demagnetize foreign matter through the filtering channel 120 and the demagnetization channel 130, thereby preventing foreign matter from entering the flash evaporation host 220 and causing damage to it and generating magnetic substances. The weight drop rate per unit time of the weighing module 160 can effectively determine whether the screen 121 and the demagnetization grille 131 are blocked, and they can be cleaned by cleaning the manhole 1121 to ensure the continuity of production.

[0038] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A flash evaporation device for lithium iron phosphate precursor slurry, characterized in that: include: A pre-treatment component, the pre-treatment component comprises an auxiliary material bin, a filtering channel and a demagnetization channel, the feeding end of the auxiliary material bin faces the unloading end of the previous process, and the discharging end of the auxiliary material bin is connected to the filtering channel and the demagnetization channel in sequence; A flash evaporation component comprises a main silo and a flash evaporation main machine, the inlet of the main silo is connected to the demagnetization channel, and the outlet of the main silo is connected to the flash evaporation main machine.

2. The lithium iron phosphate precursor slurry flash evaporation device according to claim 1, characterized in that: The pre-processing component also includes weighing modules arranged on both sides of the auxiliary silo.

3. The lithium iron phosphate precursor slurry flash evaporation device according to claim 2, characterized in that: The pre-processing component also includes impact air hammers arranged on both sides of the auxiliary material bin, and the impact air hammers are located at the lower part of the weighing module.

4. The lithium iron phosphate precursor slurry flash evaporation device according to claim 3, characterized in that: The auxiliary silo is composed of a first auxiliary silo and a second auxiliary silo. The feed end of the first auxiliary silo faces the discharge end of the previous process. One end of the second auxiliary silo has a large diameter and the other end has a small diameter. The large-diameter end of the second auxiliary silo is connected to the discharge end of the first auxiliary silo, and the small-diameter end of the second auxiliary silo is connected to the filtering channel. Wherein, the weighing modules are arranged on both sides of the first auxiliary material bin, and the impact air hammer is arranged on both sides of the second auxiliary material bin.

5. The lithium iron phosphate precursor slurry flash evaporation device according to claim 4, characterized in that: A cleaning manhole is formed on the side of the second auxiliary silo.

6. The lithium iron phosphate precursor slurry flash evaporation device according to claim 5, characterized in that: The pre-treatment component further includes a first connecting member, and two ends of the first connecting member are respectively connected to the second auxiliary silo and the filtering channel.

7. The lithium iron phosphate precursor slurry flash evaporation device according to claim 6, characterized in that: The pre-treatment component also includes a second connecting member, and two ends of the second connecting member are respectively connected to the demagnetization channel and the main silo.

8. The lithium iron phosphate precursor slurry flash evaporation device according to claim 3, characterized in that: It also includes a controller, which is electrically connected to the weighing module, the impact air hammer and the flash evaporation host respectively.

9. The lithium iron phosphate precursor slurry flash evaporation device according to claim 1, characterized in that: A screen is laid in the filtering channel.

10. The lithium iron phosphate precursor slurry flash evaporation device according to claim 1, characterized in that: A demagnetization grid is laid in the demagnetization channel.

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