High-pressure flushing device

Abstract

The utility model discloses a high-pressure flushing device which is used for extracting metal particles in a lithium ion battery material and comprises a tank body, a first opening is formed in the upper side of the tank body and used for allowing flushing fluid to enter, and a second opening is formed in the lower side of the tank body and used for allowing the flushing fluid to flow out; the cover body is connected with the upper side of the tank body in an openable and closable mode, the cover body is provided with a flushing device, the flushing device comprises a liquid inlet pipe and a flushing pipe which are communicated, the liquid inlet pipe is used for being externally connected with flushing liquid, the flushing pipe is rotatably connected with the cover body, and when the cover body is closed, the flushing pipe is located above the installation position; and the screen mesh is detachably arranged in the tank body. The high-pressure flushing device can extract all magnetic metal, weakly magnetic metal and non-magnetic metal impurities with the size larger than or equal to 25 microns.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion positive electrode material detection, in particular to a high-pressure flushing device. Background Art

[0002] During the battery formation stage, metal foreign matter will first be oxidized at the positive electrode and then reduced at the negative electrode. When the metal single substance at the negative electrode accumulates to a certain extent, it will form dendrites, causing perforation of the diaphragm, resulting in internal short circuit of the battery, and increasing the self-discharge rate of the battery. In severe cases, it may even cause the battery to catch fire or explode, seriously affecting the safety performance of the battery. Studies have shown that metal impurities with a particle size greater than or equal to 25μm, especially heavy metal elements such as Cu and Zn, have a particularly serious impact on battery performance, and the larger the particle size, the higher the battery self-discharge rate. Therefore, it is very important to detect the morphology and properties of metal particles with a size greater than or equal to 25μm in battery materials.

[0003] In the current technical research process, many metal impurities are measured by ICP method, but the mass of the material generally weighed in ICP test is 0.1g~2g, the amount of sample selected is too small, the selected sample cannot accurately represent the metal content of the whole sample, and the ICP test will destroy the morphology of metal particles, so there will be batteries with no abnormalities in the ICP test results, but they will still self-discharge in reality. There is also a method of observing metal particles of fixed size through a microscope, but this method requires batch processing of samples with magnetic bars, generally about 1.5kg~3kg, which is a lot of work. And the metal elements processed by the magnetic bar are all magnetic metals, among which non-magnetic or magnetic metal impurities cannot be detected, and the microscope can only roughly judge whether it is a metal element by contrast comparison, and cannot accurately determine what kind of metal the particles are or whether they must be metal elements. Summary of the invention

[0004] In order to overcome the defects in the prior art, the utility model provides a high-pressure flushing device, which can extract all metal impurities with a size greater than or equal to 25μm from an appropriate amount of lithium-ion battery material, including magnetic metals, weakly magnetic metals and non-magnetic metals, to ensure the accuracy of subsequent detection of the metal impurity content in the lithium-ion battery material.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a high-pressure flushing device for extracting metal particles from lithium-ion battery materials, comprising:

[0006] A tank body, wherein a mounting position for placing a screen is provided in the tank body, a first opening is provided on the upper side of the tank body, the first opening is used for flushing liquid to enter, and a second opening is provided on the lower side of the tank body, the second opening is used for flushing liquid to flow out;

[0007] A lid, which is detachably connected to the upper side of the tank body. The lid is provided with a flushing device, which includes a liquid inlet pipe and a flushing pipe that are connected. The liquid inlet pipe is used to connect to an external flushing liquid. The flushing pipe is rotatably connected to the lid. When the lid is closed, the flushing pipe is located above the installation position.

[0008] A screen, which is detachably arranged at the installation position.

[0009] Through the above solution, open the lid of the tank body, install the screen at the installation position, place an appropriate amount of lithium-ion battery material on the screen, cover the lid, connect the liquid inlet pipe to the flushing liquid, and then start flushing. During the flushing process, control the rotation of the flushing pipe. During this process, metal impurities with a size less than 25μm will leak down through the holes of the screen, leaving all metal impurities with a size greater than or equal to 25 microns.

[0010] Further, the flushing pipe includes a first flushing pipe and a second flushing pipe. The first flushing pipe is arranged facing the screen, and there is an included angle between the second flushing pipe and the first flushing pipe. The first flushing pipe directly flushes the flushing liquid onto the screen to provide sufficient impact force to wash off metal impurities with a size less than 25 microns.

[0011] Further, the flushing pipe includes at least two second flushing pipes, which are arranged at intervals along the periphery of the first flushing pipe, and the outlets of the second flushing pipes face the inner side wall of the tank body. During flushing, as the flushing pipe rotates, the second flushing pipes rotate to flush the inner side wall of the tank body, thereby washing the metal impurities that have been impacted onto the side wall of the tank body back onto the screen.

[0012] Further, the flushing pipe is connected with a grinding rod, which extends to contact the screen, and the grinding rod can rotate with the flushing pipe. During the flushing process, the grinding rod can break the agglomeration between particles and also break the connection film between the material and the solvent to accelerate the flushing process.

[0013] Further, the liquid inlet pipe is connected with a booster pump, and the booster pump is used to adjust the pressure in the liquid inlet pipe, thereby controlling the flow rate of the flushing liquid.

[0014] Further, the liquid inlet pipe is connected with a regulating valve, and the regulating valve is used to adjust the flow rate of the flushing liquid.

[0015] Further, the flushing pipe is connected to the lid through a rotary joint, and the rotary joint is connected with a motor, and the motor can drive the rotary joint to drive the flushing pipe to rotate. By driving the flushing pipe to rotate with the motor, automation is realized, and it is convenient to control the rotation speed of the flushing pipe using the motor.

[0016] Further, it further includes a waste liquid tank, in which a supporting part is provided for supporting the tank body. The rinsing liquid after rinsing and metal impurities with a size less than 25 μm are stored in the waste liquid tank, and after filtering, the metal impurities can be recovered.

[0017] Further, the axial width of the tank body decreases from the first opening towards the second opening. This structure enables the tank body to be easily placed on the supporting part.

[0018] Further, a polytetrafluoroethylene filter screen with 200 meshes to 800 meshes is covered outside the screen. A layer of polytetrafluoroethylene filter screen is covered outside the screen to ensure that the entire surface of the screen is made of non-metallic material.

[0019] Further, the inner cavity of the tank body is also made of non-metallic material to avoid introducing new metal impurities during the rinsing process, which may affect the results of detecting the morphology and properties of metal particles in the subsequent battery material.

[0020] Further, it further includes a storage tank, which is connected to the liquid inlet pipe and is used for storing the rinsing liquid.

[0021] With the above technical solutions, the beneficial effects of the present utility model are as follows:

[0022] In this application, a screen is provided to place the lithium-ion battery material, and the material on the screen is fully rinsed by a rotatable rinsing pipe to rinse off the metal impurities with a size less than 25 μm, leaving the metal impurities with a size greater than 25 μm on the screen, ensuring the accuracy of detecting the morphology and properties of metal particles in the subsequent battery material;

[0023] In this application, by providing a plurality of second rinsing pipes spaced around the first rinsing pipe, the metal impurities impacted on the side wall of the tank body are washed back onto the screen, ensuring the accuracy of the final material collection.

[0024] To make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1It is a schematic structural diagram of the overall device of the high-pressure flushing device in the embodiment of the present utility model;

[0027] Figure 2 It is a schematic structural diagram of the cover body of the tank body in the embodiment of the present utility model.

[0028] Reference numerals in the above drawings: 1, waste liquid tank; 11, support plate; 12, piston; 2, tank body; 21, cover body; 211, side plate; 212, top plate; 3, screen; 41, liquid inlet; 42, liquid outlet; 5, liquid inlet pipe; 51, booster pump; 52, regulating valve; 53, storage tank; 61, first flushing pipe; 62, second flushing pipe; 63, grinding rod. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that in the description of the present utility model, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] Embodiment: As shown in combination with Figure 1-2 shown, a high-pressure flushing device is disclosed in this embodiment for extracting metal particles from lithium-ion battery materials, including:

[0032] A waste liquid tank 1, in which a support part is provided, such as Figure 1 described, the support part is a support plate 11 connected to the inner side wall of the waste liquid tank 1, and a through hole for the tank body 2 to pass through is provided at the center of the support plate 11. The waste liquid tank 1 is used to temporarily store the used flushing liquid. An outlet is provided at the bottom of the waste liquid tank 1, and a piston 12 is provided at the outlet. When it is necessary to collect the used flushing liquid, the inlet of the collection container is docked with the outlet of the waste liquid tank 1 and the piston 12 is opened.

[0033] The tank body 2 is placed on the support plate 11. The main body of the tank body 2 is in the shape of an inverted frustum. The bottom of the tank body 2 is a second opening for the flushing liquid to flow into the waste liquid tank 1. An installation part for placing the screen 3 is provided inside the tank body 2. A first opening is provided on the upper side of the tank body 2, and a lid 21 that can be opened and closed is provided at the first opening. The lid 21 includes a side plate in contact with the tank body 2 and a top plate 212 located on the side of the side plate 211 facing away from the tank body 2. A connection part is provided at the center of the top plate 212. The connection part includes a liquid inlet 41 for externally connecting the flushing liquid and a liquid outlet 42 for the user to connect the flushing pipe.

[0034] It should be noted that research shows that metal impurities with a particle size greater than or equal to 25 μm, especially heavy metal elements such as Cu and Zn, have a particularly serious impact on the battery performance, and the larger the particles, the higher the self-discharge rate of the battery. Therefore, the screen 3 described in this application is used to screen out impurities with a size greater than or equal to 25 μm.

[0035] It should be noted that a polytetrafluoroethylene filter screen with 200 to 800 meshes is covered on the outside of the screen 3. A layer of polytetrafluoroethylene filter screen is covered on the outside of the screen 3 to ensure that the entire surface of the screen is made of non-metallic material. The inner cavity of the tank body 2 is also made of non-metallic material to avoid introducing new metal impurities during the flushing process and affecting the results of subsequent detection of the morphology and properties of metal particles in the battery material.

[0036] The liquid inlet 41 is used to install the liquid inlet pipe 5. A booster pump 51 and a regulating valve 52 are connected to the liquid inlet pipe 5. The end of the liquid inlet pipe 5 facing away from the liquid inlet 41 is used to connect the storage tank 53, and the storage tank 53 is used to store the flushing liquid. The booster pump 51 provides pressure to suck the flushing liquid into the liquid inlet pipe 5 until it flushes on the screen 3. The flow rate of the flushing liquid can be adjusted by adjusting the regulating valve 52 during the flushing process. Preferably, the capacity of the storage tank 53 in this application is L.

[0037] The liquid outlet 42 is used to install the flushing pipe. The flushing pipe includes a first flushing pipe 61 disposed opposite to the screen 3 and second flushing pipes 62 spaced at intervals around the first flushing pipe 61. An angle is provided between the first flushing pipe 61 and the second flushing pipes 62. The outlet of the first flushing pipe 61 faces the screen 3 directly, so as to directly flush the flushing liquid on the screen 3 to wash away impurities with a size less than 25 μm. There are two second flushing pipes 62, and the two second flushing pipes 62 are disposed on both sides of the first flushing pipe 61. The outlet of the second flushing pipe 62 faces the inner wall of the tank body 2 and is used to wash the impurities splashed onto the inner wall of the tank body 2 back onto the screen 3.

[0038] There are two grinding rods 63 provided on the flushing pipe. The two grinding rods 63 are respectively located on both sides of the first flushing pipe 61. The grinding rods 63 extend to contact the screen 3, and the grinding rods 63 can rotate together with the flushing pipe. During the re-flushing process, the grinding rods 63 can break the agglomeration between particles and also break the connecting film between the material and the solvent, enabling impurities with a size less than 25 μm to slide down from the screen holes of the screen 3 as soon as possible, thus accelerating the flushing process.

[0039] The flushing pipe is connected to the liquid outlet 42 through a rotary joint. The rotary joint is connected with a motor, and the motor can drive the rotary joint to drive the flushing pipe to rotate. By driving the flushing pipe to rotate through the motor, automation is achieved, and it is convenient to control the rotation speed of the flushing pipe using the motor.

[0040] Through the above solution, open the cover 21 of the tank body 2, install the screen 3 at the installation position, place an appropriate amount of lithium-ion battery material on the screen 3, cover the cover 21, connect the liquid inlet pipe 5 with the flushing liquid and then start the booster pump 51 to start flushing, and control the rotation of the flushing pipe during the flushing process. During this process, metal impurities with a size less than 25 μm will leak from the holes of the screen, thus leaving all metal impurities with a size greater than 25 microns.

[0041] In the present utility model, specific embodiments are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A high-pressure flushing device for extracting metal particles from lithium-ion battery materials, characterized in that, Comprising: A tank body, an installation position for placing a screen is provided inside the tank body, a first opening is provided on the upper side of the tank body, the first opening is used for the flushing liquid to enter, a second opening is provided on the lower side of the tank body, and the second opening is used for the flushing liquid to flow out; A cover body, the cover body is connected to the upper side of the tank body in an openable and closable manner, the cover body is provided with a flushing device, the flushing device includes a liquid inlet pipe and a flushing pipe that are communicated, the liquid inlet pipe is used for connecting an external flushing liquid, the flushing pipe is rotatably connected to the cover body, and when the cover body is closed, the flushing pipe is located above the installation position; A screen, the screen is detachably arranged inside the tank body.

2. The high-pressure flushing device according to claim 1, characterized in that, The flushing pipe includes a first flushing pipe and a second flushing pipe, the first flushing pipe is arranged facing the screen, and an included angle is provided between the second flushing pipe and the first flushing pipe.

3. The high-pressure flushing device according to claim 2, wherein, The flushing pipe includes at least two of the second flushing pipes, and the second flushing pipes are arranged at intervals along the periphery of the first flushing pipe.

4. The high-pressure flushing device according to claim 1 or 3, characterized in that The flushing pipe is connected with a grinding rod, the grinding rod extends to contact the screen, and the grinding rod can rotate together with the flushing pipe.

5. The high-pressure flushing device according to claim 1, characterized in that, The liquid inlet pipe is connected with a booster pump, and the booster pump is used for adjusting the pressure in the liquid inlet pipe so as to control the flow rate of the flushing liquid.

6. The high-pressure flushing device according to claim 1 or 5, characterized in that The liquid inlet pipe is connected with a regulating valve, and the regulating valve is used for adjusting the flow rate of the flushing liquid.

7. The high-pressure flushing device according to claim 4, characterized in that, The flushing pipe is connected to the cover body through a rotary joint, and the rotary joint is connected with a motor, and the motor can drive the rotary joint to drive the flushing pipe to rotate.

8. The high-pressure flushing device according to claim 1, wherein, The outside of the screen is covered with a polytetrafluoroethylene filter screen with 200 meshes to 800 meshes.

9. The high-pressure flushing device according to claim 1, wherein, It further includes a waste liquid tank, a supporting part is provided inside the waste liquid tank, the supporting part is used for supporting the tank body, an opening is provided at the bottom of the waste liquid tank, and a piston is provided at the opening.

10. The high-pressure flushing device according to claim 1, characterized in that, The axial width of the tank body decreases from the first opening towards the second opening.

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