Iron removal rod and slurry filtering device

Abstract

The utility model discloses an iron removal rod and a slurry filtering device. The iron removal rod comprises a plurality of magnetization units which are spliced in series, each magnetization unit comprises two or four magnets; one longitudinal side of each magnet is an S pole, and the other longitudinal side of each magnet is an N pole; a linear magnetization surface is formed at the intersection of the adjacent magnets of the magnetization unit, and the polarities of the sides, close to each other, of the magnets on the two sides of the linear magnetization surface are the same; the magnetization direction of the magnet of each magnetization unit meets the requirement that a strong linear magnetization area is axially formed on the side face, corresponding to the linear magnetization face, of the iron removal rod. According to the iron removal rod provided by the utility model, the magnetization unit adopts two or four magnets, the magnetic circuit layout is optimized, a strong linear magnetization area can be formed in the axial direction of the iron removal rod, the magnetic field intensity is enhanced, the adsorption area is enlarged, magnetic particles such as scrap iron in slurry are effectively adsorbed, and the efficiency and thoroughness of magnetic removal are improved; impurities can be prevented from forming a microbattery in the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery technical field especially, relates to a kind of iron bar and slurry filtering device. BACKGROUND

[0002] The positive and negative electrode materials of lithium ion battery are mixed with iron filings in slurry in the process of slurry preparation because of grinding or stirring, and a small amount of iron filings can form micro-batteries in lithium ion batteries, reducing the capacity of lithium ion batteries, and may also cause the rupture of the separator, and even cause the battery explosion or fire. Therefore, it is necessary to eliminate the presence of iron filings in slurry as much as possible. In the prior art, the iron removal bar has the problems of small adsorption area, incomplete adsorption, and ineffective use of magnetic field. SUMMARY

[0003] The utility model discloses a kind of iron bar, its magnetization unit adopts two or four magnets, optimizes magnetic circuit layout, can form strong linear magnetization area in the axial direction of iron removal bar, enhance magnetic field intensity, increase adsorption area, effectively adsorb the magnetic particles such as iron filings in slurry, improve the efficiency and thoroughness of demagnetization, can prevent impurities from forming micro-batteries in battery. In addition, a slurry filtering device is also provided, which maximizes contact with slurry and adsorbs magnetic particles.

[0004] To achieve the above object, the following technical scheme is adopted:

[0005] An iron removal bar includes a plurality of magnetization units connected in series. Each magnetization unit includes two or four magnets. The longitudinal side of each magnet is an S pole, and the longitudinal side of each magnet is an N pole. The adjacent magnets of the magnetization unit form a linear magnetization surface at the intersection. The polarity of the side of the magnets on the two sides of the linear magnetization surface that are close to each other is the same. The magnetization direction of the magnets of each magnetization unit satisfies the formation of a strong linear magnetization area in the axial direction of the side surface of the iron removal bar corresponding to the linear magnetization surface.

[0006] Preferably, each magnetization unit includes four magnets arranged opposite to each other, and the cross section of the four magnets is arranged in a square shape. The four magnets are sequentially arranged in a clockwise direction from the upper left to the lower left as a first magnet, a second magnet, a third magnet, and a fourth magnet. The polarity of the side of the first magnet and the second magnet that are close to each other is opposite, the polarity of the side of the second magnet and the third magnet that are close to each other is the same, the polarity of the side of the third magnet and the fourth magnet that are close to each other is opposite, and the polarity of the side of the fourth magnet and the first magnet that are close to each other is the same. The intersection of the four magnets forms a horizontal intersection surface and a vertical intersection surface, and the horizontal intersection surface and the linear magnetization surface are located in the same plane. The included angle between the magnetization direction of each magnet and the horizontal intersection surface or the vertical intersection surface is 25°-60°.

[0007] Preferably, each magnetization unit includes two magnets arranged opposite each other; the intersection surface of the two magnets is located on the same plane as the linear magnetization surface; the magnetization direction of each magnet is perpendicular to the intersection surface.

[0008] Preferably, the iron removal rod has a cylindrical structure.

[0009] Preferably, the magnet is a high-performance grade of sintered NdFeB magnet.

[0010] Preferably, all magnets of each magnetization unit are fixed in the outer circumference by a casing.

[0011] In addition, a slurry filtration device is provided, including the aforementioned iron removal rod and a receiving body; the receiving body has a receiving cavity for slurry to pass through; the iron removal rod is placed in the receiving cavity in a horizontal direction, and the length direction of the iron removal rod is perpendicular to the flow direction of the slurry.

[0012] Preferably, the cavity is provided with multiple layers of iron removal rods arranged in an alternating pattern; each layer of iron removal rods includes multiple iron removal rods arranged at intervals.

[0013] By adopting the above solution, the beneficial effects of this utility model are:

[0014] This invention provides an iron removal rod whose magnetization unit employs two or four magnets with an optimized magnetic circuit layout. This creates a strong linear magnetization region along the axial direction of the rod, enhancing the magnetic field strength, increasing the adsorption area, and effectively adsorbing magnetic particles such as iron filings in the slurry. This improves the efficiency and thoroughness of demagnetization and prevents impurities from forming micro-cells within the slurry. Furthermore, a slurry filtration device is also provided to maximize contact with the slurry and adsorb magnetic particles. Attached Figure Description

[0015] Figure 1 This is a perspective view of the iron removal rod in Embodiment 1 of this utility model;

[0016] Figure 2 This is a perspective view of the magnetization unit in Embodiment 1 of this utility model;

[0017] Figure 3 This is a first magnetic circuit layout diagram of the iron removal rod in Embodiment 1 of this utility model;

[0018] Figure 4 This is a second magnetic circuit layout diagram for removing the iron rod in Embodiment 1 of this utility model;

[0019] Figure 5 This is a perspective view of the iron removal rod in Embodiment 2 of this utility model;

[0020] Figure 6 This is a perspective view of the magnetization unit in Embodiment 2 of this utility model;

[0021] Figure 7 This is a first magnetic circuit layout diagram of the iron removal rod in Embodiment 2 of this utility model;

[0022] Figure 8 This is a second magnetic circuit layout diagram of the iron removal rod in Embodiment 2 of this utility model;

[0023] Figure 9 This is a schematic diagram of the slurry filtration device according to Embodiment 1 of this utility model;

[0024] Figure 10 This is a schematic diagram of the slurry filtration device according to Embodiment 2 of this utility model;

[0025] The following are explanations of the labels in the attached diagram:

[0026] 1—Iron removal rod, 2—Magnetization unit,

[0027] 3—Magnet, 4—Linear magnetization surface,

[0028] 5—The main body to be contained. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] Reference Figures 1 to 8As shown, this utility model provides an iron removal rod 1, comprising several magnetization units 2 connected in series; each magnetization unit 2 includes two or four magnets 3; specifically, the magnets 3 are high-performance sintered neodymium iron boron magnets. Each magnet 3 has an S pole on one longitudinal side and an N pole on the other longitudinal side; a linear magnetization surface 4 is formed at the intersection of adjacent magnets 3 in the magnetization unit 2, and the magnets 3 on both sides of the linear magnetization surface 4 have the same polarity on the side closest to each other; the magnetization direction of the magnets 3 in each magnetization unit 2 satisfies the requirement of forming a strong linear magnetization region axially on the side of the iron removal rod 1 corresponding to the linear magnetization surface 4.

[0033] Example 1:

[0034] Each magnetization unit 2 includes four magnets 3 arranged in pairs facing each other, and the cross-sections of the four magnets 3 are arranged in a square pattern. The four magnets 3 are arranged in a clockwise direction from the upper left to the lower left as the first magnet, the second magnet, the third magnet, and the fourth magnet. The polarities of the first magnet and the second magnet are opposite on the side they are close to each other, the polarities of the second magnet and the third magnet are the same on the side they are close to each other, the polarities of the third magnet and the fourth magnet are opposite on the side they are close to each other, and the polarities of the fourth magnet and the first magnet are the same on the side they are close to each other. The intersection of the four magnets 3 forms a horizontal intersection plane and a vertical intersection plane, and the horizontal intersection plane and the linear magnetization plane are located on the same plane. The angle between the magnetization direction of each magnet 3 and the horizontal or vertical intersection plane is 25°-60°. Therefore, on the cross-section of the iron rod 1, the magnetization directions of the four magnets 3 are arranged in a rhomboid pattern.

[0035] In the four magnets 3 of the same magnetization unit 2, the first magnet and the second magnet are close to each other on the same side, and the third magnet and the fourth magnet are close to each other on the same side, with opposite polarities, for magnetic force transmission; the second magnet and the third magnet are close to each other on the same side, and the fourth magnet and the first magnet are close to each other on the same side, and the magnetic field strength is increased by designing the magnetization direction of the magnets 3 to form a certain angle with the horizontal or vertical intersection plane.

[0036] In one specific embodiment, please continue to refer to Figure 3The N pole of the first magnet and the S pole of the second magnet are close to each other and have opposite polarities; the N pole of the second magnet and the N pole of the third magnet are close to each other and have the same polarity; the S pole of the third magnet and the N pole of the fourth magnet are close to each other and have opposite polarities; the S pole of the fourth magnet and the S pole of the first magnet are close to each other and have the same polarity. Therefore, on the side of the linear magnetized surface 4 where the magnets 3 are close to each other, the N poles of the second and third magnets have the same polarity, and the S pole of the fourth magnet has the same polarity as the S pole of the first magnet. This results in strong linear magnetization regions being formed along the axial direction of the side of the iron removal rod 1 at the joints of the second and third magnets and the joints of the fourth and first magnets, serving as the main adsorption areas for adsorbing iron filings. Through simulation and physical testing, the strength can exceed 1T.

[0037] In another specific embodiment, please continue to refer to Figure 4 The S pole of the first magnet and the N pole of the second magnet are close to each other and have opposite polarities; the S pole of the second magnet and the S pole of the third magnet are close to each other and have the same polarity; the N pole of the third magnet and the S pole of the fourth magnet are close to each other and have opposite polarities; the N pole of the fourth magnet and the N pole of the first magnet are close to each other and have the same polarity. Therefore, on the side of the linear magnetized surface 4 where the magnets 3 are close to each other, the S poles of the second and third magnets have the same polarity, and the N pole of the fourth magnet has the same polarity as the N pole of the first magnet. This results in strong linear magnetization regions being formed along the axial direction of the iron removal rod 1 at the joints between the second and third magnets and between the fourth and first magnets, serving as the main adsorption areas for iron filings. Through simulation and physical testing, the strength can exceed 1T.

[0038] By using magnetic circuit simulation design to optimize the magnetic field distribution, the demagnetization efficiency is further improved, ensuring that magnetic impurities in the slurry are effectively removed, thereby guaranteeing the performance and safety of lithium-ion batteries.

[0039] Furthermore, the beneficial effect is maximized when the magnetization direction of each magnet 3 forms an angle of 45° with both the horizontal and vertical intersection planes.

[0040] Example 2:

[0041] Each magnetization unit 2 includes two magnets 3 arranged opposite each other; the intersection surface of the two magnets 3 is located on the same plane as the linear magnetization surface 4; the magnetization direction of each magnet 3 is perpendicular to the intersection surface.

[0042] Please continue to refer to Figure 7 The N poles of the upper and lower magnets are close to each other and have the same polarity. Please continue reading. Figure 8The S poles of the upper and lower magnets are close to each other and have the same polarity. Therefore, at the joint between the upper and lower magnets, the iron removal rod 1 forms strong linear magnetization regions on both sides, serving as the main adsorption areas for iron filings. Simulation and physical testing have shown that the magnetization strength can exceed 1T. Magnetic circuit simulation design optimizes the magnetic field distribution, further improving demagnetization efficiency and ensuring effective removal of magnetic impurities from the slurry, thereby guaranteeing the performance and safety of the lithium-ion battery.

[0043] In the above embodiments 1 and 2, setting two or four magnets 3 in the magnetization unit 2 has its own advantages. Setting two magnets 3 results in a stronger magnetic force, while setting four magnets 3 results in a wider magnetic field radiation range.

[0044] Furthermore, the iron removal rod 1 has a cylindrical structure. Designing the iron removal rod 1 as a cylinder has the following advantages: 1) It can accommodate a larger number of iron removal rods 1 in a limited space, and the cylindrical structure of the iron removal rod 1 has a larger surface area, which can make it more fully in contact with the slurry; 2) It facilitates the flow of the slurry and has less interference with the normal flow state of the slurry; 3) The cylindrical structure of the iron removal rod 1 has strong wear resistance and fatigue resistance.

[0045] Since the magnets 3 on both sides of the linear magnetization surface 4 have the same polarity on the side that is close to each other, a shell is provided to fix all the magnets 3 on the outer periphery of each magnetization unit 2.

[0046] In addition, refer to Figures 9 to 10 As shown, a slurry filtration device is also provided, including the aforementioned iron removal rod 1 and a receiving body 5; the receiving body 5 has a receiving cavity for slurry to pass through; the iron removal rod 1 is placed horizontally in the receiving cavity, and the length direction of the iron removal rod 1 is perpendicular to the flow direction of the slurry. The receiving cavity is provided with multiple layers of iron removal rods 1 arranged in a staggered manner; each layer of iron removal rods 1 includes multiple iron removal rods 1 arranged at intervals, maximizing contact with the slurry and adsorbing magnetic particles.

[0047] In practical applications, depending on the specific preparation process and equipment conditions of the lithium-ion battery slurry, other suitable quantities and arrangements of the iron removal rods 1 can be selected.

[0048] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the utility model and are not intended to limit the implementation of this utility model. For those skilled in the art, various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An iron removal rod, characterized in that, It includes several magnetization units connected in series; each magnetization unit includes two or four magnets; one longitudinal side of each magnet is the S pole and the other longitudinal side is the N pole; a linear magnetization surface is formed at the intersection of adjacent magnets in the magnetization unit, and the magnets on both sides of the linear magnetization surface have the same polarity on the side that is close to each other; the magnetization direction of the magnets in each magnetization unit satisfies the requirement of forming a strong linear magnetization region on the axial side of the iron removal rod corresponding to the linear magnetization surface.

2. The iron removal rod according to claim 1, characterized in that, Each magnetization unit includes four magnets arranged in pairs facing each other, with the cross-sections of the four magnets arranged in a square pattern. The four magnets are arranged clockwise from the upper left to the lower left as the first magnet, the second magnet, the third magnet, and the fourth magnet. The polarities of the first magnet and the second magnet are opposite on the side they are close to each other, the polarities of the second magnet and the third magnet are the same on the side they are close to each other, the polarities of the third magnet and the fourth magnet are opposite on the side they are close to each other, and the polarities of the fourth magnet and the first magnet are the same on the side they are close to each other. The intersection of the four magnets forms a horizontal intersection plane and a vertical intersection plane, and the horizontal intersection plane and the linear magnetization plane are located on the same plane. The angle between the magnetization direction of each magnet and the horizontal or vertical intersection plane is 25°-60°.

3. The iron removal rod according to claim 1, characterized in that, Each magnetization unit includes two magnets arranged opposite each other; the intersection surface of the two magnets is located on the same plane as the linear magnetization surface; the magnetization direction of each magnet is perpendicular to the intersection surface.

4. The iron removal rod according to claim 2 or 3, characterized in that, The iron removal rod has a cylindrical structure.

5. The iron removal rod according to claim 2 or 3, characterized in that, The magnet is a high-performance grade of sintered NdFeB magnet.

6. The iron removal rod according to claim 2 or 3, characterized in that, Each magnetization unit has a casing around its outer periphery to fix all magnets.

7. A slurry filtration device, comprising the iron removal rod according to any one of claims 1-3, characterized in that, It also includes a receiving body; the receiving body has a receiving cavity for the slurry to pass through; the iron removal rod is placed in the receiving cavity in a horizontal direction, and the length direction of the iron removal rod is perpendicular to the flow direction of the slurry.

8. The slurry filtration device according to claim 7, characterized in that, The cavity contains multiple layers of iron removal rods arranged in an alternating pattern; each layer of iron removal rods includes multiple iron removal rods arranged at intervals.

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