Device for testing and collecting magnetic particles of raw materials for batteries

Abstract

The utility model provides a device for testing and collecting magnetic particles of raw materials for batteries, and belongs to the technical field of battery detection. The cleaning device comprises a cleaning part and a magnetic part, the bottom of the cleaning part is concave, a first sectional threaded buckle is arranged on the inner wall of the concave bottom, a plurality of magnets are arranged in the magnetic part, a second sectional threaded buckle is arranged on the top of the magnetic part, and the magnetic part is installed at the concave bottom of the cleaning part. And the second sectional threaded buckle of the magnetic component is inserted into the first sectional threaded buckle of the cleaning component. In the collecting device, the cleaning component is tightly combined with the magnetic component, so that the problem of magnetic force reduction is greatly reduced; a plurality of magnetic blocks are arranged in the magnetic part for magnetic attraction, and the magnetic blocks do not need to be moved, so that the phenomenon of missing attraction is prevented, and the accuracy of a test result is improved; the whole collection process is completely carried out in the cleaning part, the magnetic particles which are not adsorbed at the bottom of the cleaning part in time overflow, the number of the magnetic particles is reduced, and test errors are prevented.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing technology, specifically relating to a testing and collection device for magnetic particles used in battery raw materials. Background Technology

[0002] Currently, China has built the world's largest and most complete new energy industry chain. With increasing market penetration, the range and safety performance of new energy vehicles have received widespread attention. These performance characteristics are closely related to the vehicle's power battery. The performance of the power battery largely depends on the cathode and anode materials.

[0003] During the production of positive and negative electrode materials used in power batteries, magnetic particles are inevitably generated. These magnetic particles not only affect the self-discharge performance of lithium battery materials and reduce their specific capacity and energy density during battery use, but also dissolve in the electrolyte, causing a series of side reactions that impact the battery's lifespan and safety performance. Therefore, while striving to control the generation of magnetic particles, accurate detection and tracing of these particles have become crucial.

[0004] Currently, the main methods for detecting magnetic particles in raw materials used in power batteries include cleanliness testing instruments, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and inductively coupled plasma atomic emission spectrometry (ICP-AES). Regardless of the method used, separating the magnetic particles from the material is a crucial step. Patent CN113670689A discloses a dry method for detecting magnetic metal particles in lithium-ion battery cathode materials. This method uses a magnetic rod fitted with a heat-shrink tubing to attract the magnetic particles from the material. The particles are extracted through washing, filtered, dried, and then tested using a cleanliness testing instrument. The washing step specifically involves rinsing the magnetic particles into a beaker, using a small magnetic block to hold the particles at the bottom of the beaker, and repeatedly washing until the solution in the beaker is no longer cloudy.

[0005] Therefore, existing magnetic particle testing and collection devices have the following shortcomings:

[0006] 1. The method of manually fixing the small magnetic block to the beaker cannot concentrate all the collected magnetic particles. The magnetic particles are likely to be lost during the washing process, which seriously affects the accuracy of magnetic particle testing.

[0007] 2. The current method for collecting magnetic particles involves adding a small magnetic block to the bottom of the beaker. However, the magnetic adsorption area of ​​the small magnetic block is limited, requiring constant movement of the small magnetic block to collect the magnetic particles. In this process, there is a high possibility of missed particles, which affects the accuracy of the test results.

[0008] 3. In the existing method, the concave bottom of the beaker and the flat small magnetic block cannot be tightly connected. The magnetic force of the magnetic block is greatly reduced as it is blocked by air and glass. Utility Model Content

[0009] The purpose of this invention is to overcome the problems of limited adsorption area of ​​magnetic blocks and large loss of magnetic particles in existing magnetic particle testing and collection devices, which affect the accuracy of magnetic particle test results, and to provide a magnetic particle testing and collection device for battery raw materials.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A magnetic particle testing and collection device for battery raw materials includes a cleaning component and a magnetic component. The cleaning component includes a concave bottom, and a first segmented threaded buckle is provided on the inner wall of the concave bottom. The magnetic component is provided with a plurality of magnet blocks inside, and a second segmented threaded buckle is provided on the top of the magnetic component.

[0012] The magnetic component is installed at the bottom of the concave part of the cleaning component, and the second segment threaded buckle at the top of the magnetic component is inserted into the first segment threaded buckle at the bottom of the concave part.

[0013] The first segmented threaded snap fastener has an internal thread, and the second segmented threaded snap fastener has an external thread.

[0014] Includes a top cover, the cleaning component is provided with a top cover.

[0015] A sealing ring is provided between the top cover and the cleaning components.

[0016] The top cover is equipped with a handle.

[0017] The cleaning component is provided with a non-slip handle on its side.

[0018] The non-slip handle has a smooth outer surface and a wavy inner surface.

[0019] The magnet in the magnetic component has a magnetic frequency of 8000 Hz.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention provides a device for testing and collecting magnetic particles from battery raw materials. The device includes a cleaning component and a magnetic component. The cleaning component has a concave bottom with a first segmented threaded snap-fit ​​on the inner wall of the concave bottom. The magnetic component contains several magnet blocks and has a second segmented threaded snap-fit ​​on its top. The magnetic component is installed at the concave bottom of the cleaning component, with the second segmented threaded snap-fit ​​on its top inserted into the first segmented threaded snap-fit ​​at the concave bottom. A mixed solution of magnetic particles and raw materials is poured into the cleaning component. The second segmented threaded snap-fit ​​of the magnetic component is inserted into the first segmented threaded snap-fit ​​of the cleaning component. Rotating the magnetic component or the cleaning component tightens the threads. Shaking the collection device utilizes the magnetic force of the magnetic component to firmly attract the magnetic particles in the cleaning component. Pouring the solution from the cleaning component separates the raw materials from the magnetic particles because the raw materials are non-magnetic. Adding pure water completely separates the raw materials from the magnetic particles, leaving only the magnetic particles in the cleaning component. In this collection device, the cleaning component and the magnetic component are tightly integrated, which greatly reduces the problem of magnetic force reduction. The use of a magnetic component with a large adsorption area is conducive to complete collection during the magnetic particle collection process. By setting several magnetic blocks inside the magnetic component for magnetic attraction, there is no need to move the magnetic blocks, which prevents the leakage of magnetic particles and improves the accuracy of test results. The entire collection process is carried out entirely in the cleaning component, which will overflow any magnetic particles that have not yet been adsorbed at the bottom of the cleaning component, reducing the number of magnetic particles and preventing test errors.

[0022] Furthermore, this device features a top cover on the cleaning component to prevent liquid from splashing out during shaking. This also prevents airborne magnetic particles from entering the cleaning component, which could increase the number of magnetic particles and cause testing errors. This offers a significant advantage over current beaker-based cleaning devices. With open beakers, liquid may splash out during operation, and airborne magnetic particles may fall into the beaker, both of which can introduce testing errors. In particular, airborne magnetic particles entering the beaker can greatly mislead the tracing of the magnetic particles' origin.

[0023] Furthermore, the integrated handle design allows for one-handed operation, a significant improvement over the two-handed operation using a beaker and magnet. The entire magnetic particle collection process no longer depends on the employee's skill level, increasing the reliability of the test. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of a magnetic particle testing and collection device for battery raw materials according to the present invention.

[0026] Table 1 is a comparison table of magnetic particles collected after using this device and after using the original device.

[0027] The following are the labels in the attached diagram: 1. Top cover; 11. Handle; 12. Sealing ring; 2. Cleaning component; 21. Anti-slip handle; 22. Concave bottom; 23. First segment threaded buckle; 3. Magnetic component; 31. Magnet block; 32. Second segment threaded buckle. Detailed Implementation

[0028] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.

[0029] A magnetic particle testing and collection device for battery raw materials has the following structure:

[0030] like Figure 1 As shown, a magnetic particle testing and collection device for battery raw materials includes a top cover 1, a cleaning component 2, and a magnetic component 3.

[0031] The cleaning component 2 is cup-shaped with a concave bottom 22. The inner wall of the concave bottom 22 is provided with a first segmented threaded buckle 23, which is an internal thread. The magnetic particles and raw material mixture solution is loaded into the cleaning component, and the top cover 1 is then placed on top. The top cover 1 has a sealing ring 12, which effectively isolates the inside from the outside. The top cover 1 has a handle 11 on its upper part for easy opening and closing. The cleaning component 2 also has a handle 11 on its side; the handle's outer surface is smooth, while the inner surface is wavy for easy gripping.

[0032] The magnetic component 3 is cylindrical and has several cylindrical magnet blocks 31 inside. The top has a protruding second segment threaded buckle 32, which is an external thread. The magnetic component 3 can be installed in the concave bottom 22 of the cleaning component. The second segment threaded buckle 32 on the top of the magnetic component 3 is inserted into the first segment threaded buckle 23 in the concave bottom 22 of the cleaning component 2. Rotating the magnetic component 3 or the cleaning component 2 will make the threads lock together.

[0033] Preferably, the main body of the cleaning component 2 is made of stainless steel, specifically austenitic stainless steel, such as 304 or 316 stainless steel, and the inner lining is made of polytetrafluoroethylene. The inner lining is non-magnetic and does not react with magnetic particles.

[0034] Preferably, the main body of the magnetic component 3 is made of stainless steel, specifically martensitic or ferritic stainless steel, such as 410 or 430 stainless steel. The magnetic blocks 31 in the magnetic component 3 have a magnetic frequency of 8000 Hz and there are 5 of them.

[0035] A device for testing and collecting magnetic particles from battery raw materials, the method of use of which is as follows:

[0036] The mixture of magnetic particles and raw materials is loaded into the cleaning component 2. The top cover 1 is then closed to prevent liquid splashing during shaking. The second segment threaded snap 32 of the magnetic component 3 is inserted into the first segment threaded snap 23 of the cleaning component. The magnetic component 3 or the cleaning component 2 is rotated to tighten the threads, connecting the cleaning component 2 and the magnetic component 3. The collecting device is shaken, utilizing the magnetic force of the magnetic component 3 to firmly attract the magnetic particles in the cleaning component 2. The top cover 1 is removed, and the solution in the cleaning component is poured out. Pure water is added, and the top cover 1 is closed. The above separation steps are repeated several times to completely separate the raw materials and magnetic particles, leaving only the magnetic particles in the cleaning component. The magnetic component 3 or the cleaning component 2 is rotated to loosen the threads, transferring the magnetic particles in the cleaning component 2 to a filter membrane via vacuum filtration for subsequent testing.

[0037] As shown in Table 1, this collection device is significantly more effective in collecting magnetic particles compared to the existing method of using a beaker and a small magnetic block. For collecting magnetic particles larger than 100 μm, the device provided by this invention is comparable to the original method. However, for collecting magnetic particles smaller than 100 μm, the device provides more comprehensive collection, which is beneficial for product evaluation and the tracing of magnetic particles. The testing of the number of magnetic particles is also crucial.

[0038] Table 1

[0039] Magnetic particles 100μm and above 50-100μm 25-50μm Below 25μm This device - Sample 1 3 13 26 40 Original method - Sample 1 3 8 13 25 This device - Sample 2 1 7 18 33 Original method - Sample 2 1 6 11 26 This device - Sample 3 5 27 35 55 Original method - Sample 3 4 12 18 32

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A device for testing and collecting magnetic particles used in battery raw materials, characterized in that, It includes a cleaning component (2) and a magnetic component (3). The cleaning component (2) includes a concave bottom (22), and the inner wall of the concave bottom (22) is provided with a first segmented threaded buckle (23). The magnetic component (3) is provided with a plurality of magnet blocks (31) inside, and the top of the magnetic component (3) is provided with a second segmented threaded buckle (32). The magnetic component (3) is installed in the concave bottom (22) of the cleaning component (2), and the second segmented threaded buckle (32) on the top of the magnetic component (3) is inserted into the first segmented threaded buckle (23) in the concave bottom (22).

2. The battery raw material magnetic particle testing and collection device according to claim 1, characterized in that, The first segmented threaded buckle (23) is an internal thread, and the second segmented threaded buckle (32) is an external thread.

3. The battery raw material magnetic particle testing and collection device according to claim 1, characterized in that, The cleaning component (2) is provided with a top cover (1) on its upper part.

4. The battery raw material magnetic particle testing and collection device according to claim 3, characterized in that, A sealing ring (12) is provided between the top cover (1) and the cleaning component (2).

5. The battery raw material magnetic particle testing and collection device according to claim 3, characterized in that, The top cover (1) is provided with a handle (11).

6. The battery raw material magnetic particle testing and collection device according to claim 1, characterized in that, The cleaning component (2) is provided with a non-slip handle (21) on its side.

7. The battery raw material magnetic particle testing and collection device according to claim 6, characterized in that, The anti-slip handle (21) has a smooth outer surface and a wavy inner surface.

8. The battery raw material magnetic particle testing and collection device according to claim 1, characterized in that, The magnet block (31) in the magnetic component (3) has a magnetic frequency of 8000 Hz.

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