Slurry demagnetizing cylinder, demagnetizing assembly, demagnetizing device and battery slurry demagnetizing method

Abstract

The invention provides a slurry demagnetizing cylinder, a demagnetizing assembly, a demagnetizing device and a battery slurry demagnetizing method. Wherein the slurry demagnetizing cylinder comprises a central cylinder and a first magnetic material layer, the central cylinder is provided with a first inner cavity, and the first magnetic material layer is arranged on the inner side wall or the outer side wall of the central cylinder. By adopting the slurry demagnetizing cylinder provided by the invention, magnetic substances in the battery slurry can be effectively removed, and the demagnetizing efficiency and the demagnetizing effect of the battery slurry are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery slurry demagnetization, and in particular to a slurry demagnetization cylinder, a demagnetization assembly, a demagnetization device, and a battery slurry demagnetization method. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] In recent years, as the application scope of secondary batteries has become increasingly wider, secondary batteries have been widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, as well as in many fields such as power tools, electric bicycles, electric motorcycles and electric vehicles.

[0004] Secondary batteries typically include positive and negative electrode sheets. The active material layers in these sheets are typically formed by coating the positive or negative electrode slurry onto the corresponding current collector and curing it. During the manufacturing process of the positive and negative electrode sheets, the slurry contains a small amount of magnetic substances, such as iron, chromium, nickel, and zinc, due to the introduction of positive and negative electrode raw materials and their contact with the iron container during the dispersion process. These magnetic substances in the battery slurry can affect battery performance to a certain extent.

[0005] Therefore, seeking a demagnetization device that can quickly and efficiently remove magnetic substances in battery slurry is one of the key areas of focus for those skilled in the art. Summary of the Invention

[0006] The present application is made in view of the above-mentioned problems, and one of its purposes is to provide a slurry demagnetization cylinder that has a better effect and higher removal efficiency on magnetic substances in battery slurry.

[0007] In order to achieve the above-mentioned object, the first aspect of the present application provides a slurry demagnetization cylinder, comprising:

[0008] a central tube having a first inner cavity; and

[0009] A first magnetic material layer is provided on the inner wall or the outer wall of the central tube.

[0010] The slurry demagnetizing cylinder mentioned above in the present application is a hollow structure, and the battery slurry can also flow through its inner cavity, which does not occupy too large a flow channel area and has little effect on the flow rate of the battery slurry. Compared with the traditional solid magnetic rod, the slurry demagnetizing cylinder of the present application can improve the demagnetization efficiency of the battery slurry. In addition, the slurry demagnetizing cylinder can reduce the distance between the inner wall of the container and the outer wall of the slurry demagnetizing cylinder while ensuring the flow rate of the battery slurry, thereby improving the demagnetization effect on the battery slurry. The use of the slurry demagnetizing cylinder mentioned above in the present application can effectively remove the magnetic substances in the battery slurry, and effectively improve the demagnetization efficiency and demagnetization effect of the battery slurry.

[0011] In any embodiment, the inner diameter of the slurry demagnetization cylinder is 1 mm to 20 mm. This allows the battery slurry to have a higher flow rate, improves the demagnetization efficiency, and also achieves a better demagnetization effect on the battery slurry flowing through the slurry demagnetization cylinder.

[0012] In any embodiment, the inner diameter of the slurry demagnetization cylinder is 3 mm to 10 mm.

[0013] In any embodiment, the thickness of the first magnetic material layer is greater than 0 and less than or equal to 10 mm. In this way, the magnetic substances in the battery slurry can be better adsorbed and removed.

[0014] In any embodiment, the thickness of the first magnetic material layer is 0.5 mm to 5 mm.

[0015] In any embodiment, the slurry demagnetization drum further comprises:

[0016] The second magnetic material layer is disposed on the side of the central tube facing away from the first magnetic material layer. This allows for better removal of magnetic material from the battery slurry flowing through both the outside and inside of the central tube, further enhancing the demagnetization effect on the battery slurry.

[0017] In any embodiment, the thickness of the second magnetic material layer is greater than 0 and less than or equal to 10 mm. In this way, the magnetic substances in the battery slurry can be better adsorbed and removed.

[0018] In any embodiment, the thickness of the second magnetic material layer is 0.5 mm to 5 mm.

[0019] In any embodiment, the first magnetic material layer and the second magnetic material layer independently include one or more of a neodymium iron boron magnet, a ferrite magnet, a samarium cobalt magnet, or an alnico magnet, thereby achieving a good demagnetization effect on the magnetic material in the battery slurry.

[0020] In any embodiment, the material of the central tube includes one or more of plastic, metal, or inorganic non-metallic materials.

[0021] In any embodiment, the plastic comprises one or more of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyurethane, polystyrene, or polymethyl methacrylate.

[0022] In any embodiment, the metal includes one or more of aluminum alloy or stainless steel.

[0023] In any embodiment, the inorganic non-metallic material includes one or more of aluminum oxide or zirconium oxide.

[0024] A second aspect of the present application provides a slurry demagnetization assembly, comprising:

[0025] an outer cylinder having a second inner cavity; and

[0026] The slurry demagnetizing cylinder of the first aspect of the present application is placed in the second inner cavity, the outer wall of the slurry demagnetizing cylinder and the inner wall of the outer cylinder are spaced apart to form a first slurry flow channel, and the inner cavity of the slurry demagnetizing cylinder forms a second slurry flow channel.

[0027] When using the above-mentioned slurry demagnetization assembly to demagnetize battery slurry, the battery slurry is passed into the first and second slurry flow channels. As the battery slurry flows, the first and second magnetic material layers on the slurry demagnetization cylinder adsorb and remove magnetic substances from the battery slurry in the first and second slurry flow channels. This slurry demagnetization assembly has high demagnetization efficiency and good demagnetization effect.

[0028] In any embodiment, the outer cylinder and the axis of the slurry demagnetizing cylinder are colinear, so as to further improve the demagnetization effect on the battery slurry.

[0029] In any embodiment, the distance between the outer wall of the slurry demagnetization cylinder and the inner wall of the outer cylinder is 1 mm to 20 mm. This not only allows the battery slurry to have a higher flow rate and the slurry demagnetization assembly to have a higher demagnetization efficiency, but also improves the demagnetization effect on the battery slurry.

[0030] In any embodiment, the distance between the outer side wall of the slurry demagnetizing cylinder and the inner side wall of the outer cylinder is 3 mm to 10 mm.

[0031] A third aspect of the present application provides a slurry demagnetization device, comprising:

[0032] housing; and

[0033] The slurry demagnetization assembly of the second aspect of the present application is multiple in number, and the multiple slurry demagnetization assemblies are placed in the shell.

[0034] When the slurry demagnetization device is used to remove magnetic substances in battery slurry, the battery slurry is passed into each slurry demagnetization component for demagnetization respectively; multiple slurry demagnetization components are integrated into one through the shell, which can effectively improve the battery slurry demagnetization efficiency.

[0035] The fourth aspect of the present application provides a battery slurry demagnetization method, comprising: passing the battery slurry into the slurry demagnetization component of the second aspect of the present application, or into the slurry demagnetization device of the third aspect of the present application; and allowing the battery slurry to flow through the first slurry flow channel and the second slurry flow channel.

[0036] The above-mentioned battery slurry demagnetization method can quickly and effectively remove magnetic substances in the battery slurry, and has a good demagnetization effect on the battery slurry and a high demagnetization efficiency.

[0037] In any embodiment, the battery slurry includes one or more of a lithium battery positive electrode slurry or a lithium battery negative electrode slurry.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to better describe and illustrate the embodiments or examples provided in this application, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered as limiting the scope of the disclosed application, the embodiments or examples currently described, and any of the best modes currently understood for these applications. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1 This is a three-dimensional schematic diagram of a slurry demagnetization cylinder according to an embodiment of the present application;

[0041] Figure 2 A schematic top view of a slurry demagnetization cylinder according to an embodiment of the present application;

[0042] Figure 3 A schematic perspective view of a slurry demagnetization assembly according to an embodiment of the present application;

[0043] Figure 4 A schematic top view of a slurry demagnetization assembly according to an embodiment of the present application;

[0044] Figure 5 For the Figure 4 Schematic cross-sectional view of the AA plane;

[0045] Figure 6 Schematic diagram of a slurry demagnetization device according to an embodiment of the present application.

[0046] Description of reference numerals:

[0047] 10. Slurry demagnetizing cylinder; 11. Center cylinder; 12. First magnetic material layer; 13. Second magnetic material layer; 20. Slurry demagnetizing assembly; 21. Outer cylinder; 22. First slurry flow channel; 23. Second slurry flow channel; 30. Slurry demagnetizing device; 31. Shell. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] The "range" disclosed in this application can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The range defined in this way can be inclusive or exclusive of end values, and any end value can be independently included or excluded, and can be arbitrarily combined, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also contemplated. In addition, if the minimum range values ​​listed are 1 and 2, and if the maximum range values ​​3, 4, and 5 are also listed, the following ranges can all be contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, wherein a and b are both real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to listing the parameter as, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and so on. For example, when a parameter is expressed as an integer selected from "2-10", this is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0057] In this application, open technical features or technical solutions described with words such as "contain," "include," and "include" do not exclude additional members beyond the listed members, unless otherwise specified. This can be considered as providing both closed features or solutions consisting of the listed members and open features or solutions that include additional members beyond the listed members. For example, if A includes a1, a2, and a3, it may or may not include other members unless otherwise specified. This can be considered as providing both the feature or solution that "A consists of a1, a2, and a3," and the feature or solution that "A includes not only a1, a2, and a3, but also other members." In this application, unless otherwise specified, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0058] In this application, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "optional" clauses, each "optional" clause is considered independent unless otherwise specified and there are no conflicts or constraints.

[0059] During the manufacturing process of positive and negative electrode sheets, small amounts of magnetic material can be present in the positive and negative electrode slurries due to the introduction of positive and negative electrode raw materials and their contact with iron containers during the dispersion process. These magnetic materials in the battery slurry can affect battery performance to a certain extent. Therefore, it is necessary to develop a device that can quickly and efficiently remove magnetic materials from the battery slurry.

[0060] See also Figure 1 and Figure 2 In some embodiments, the first aspect of the present application provides a slurry demagnetization cylinder 10, which includes a central cylinder 11 and a first magnetic material layer 12. The central cylinder 11 has a first inner cavity; the first magnetic material layer 12 is provided on the inner wall or the outer wall of the central cylinder 11.

[0061] Traditional battery slurry demagnetization devices typically utilize a sleeve structure, consisting of a magnetic rod and a sleeve. The magnetic rod is placed within the sleeve, which is then placed within a container containing the battery slurry. As the battery slurry flows through the container, the magnetic rod attracts the magnetic material in the battery slurry. During the demagnetization process, the magnetic rod does not come into contact with the electrode slurry, and the magnetic material is attracted to the sleeve. Once demagnetization is complete, the entire sleeve structure can be removed from the container.

[0062] In the above-mentioned traditional demagnetization device, the magnetic rod is a solid structure and occupies a large flow channel area, which has a great impact on the overall flow rate of the battery slurry in the container, resulting in a low impurity removal efficiency of the battery slurry; and, in order to ensure the flow rate of the battery slurry and the demagnetization efficiency, it is necessary to set the distance between the inner wall of the container and the outer wall of the sleeve to be relatively large, that is, the cross-sectional area of ​​the slurry flow channel in the container should be set to be relatively large; this results in the magnetic rod having a weaker magnetic attraction to the battery slurry near the inner wall of the container, and a poor effect on removing magnetic substances in the battery slurry at this location, especially the removal effect on magnetic substances with smaller particle size in the battery slurry, such as magnetic substances with a particle size of less than 20μm.

[0063] The above-mentioned slurry demagnetizing cylinder 10 of the present application adopts a central cylinder 11 with a first inner cavity as a carrier of the first magnetic material layer 12, and arranges the first magnetic material layer 12 on the inner wall or the outer wall of the central cylinder 11 to form a hollow structure of the slurry demagnetizing cylinder 10; when using the slurry demagnetizing cylinder 10 to remove magnetic substances in battery slurry, the slurry demagnetizing cylinder 10 is placed in the battery slurry, and the outer side and the inner cavity of the slurry demagnetizing cylinder 10 can be used as flow channels for the battery slurry. In the process of the battery slurry flowing through the outer side and the inner cavity of the slurry demagnetizing cylinder 10, the ferromagnetic substances in the battery slurry can be magnetized by the first magnetic material layer 12, and then adsorbed and captured by the first magnetic material layer 12 to achieve the demagnetization effect.

[0064] The slurry demagnetizing cylinder 10 has a hollow structure, and the battery slurry can also flow in its inner cavity. It will not occupy too large a flow channel area, and has little effect on the flow rate of the battery slurry. The battery slurry can be demagnetized at a faster speed, effectively improving the demagnetization efficiency of the battery slurry. Moreover, the use of the slurry demagnetizing cylinder 10 of the present application does not require the distance between the inner wall of the container and the outer wall of the slurry demagnetizing cylinder 10 to be set to a large distance, and the flow rate of the battery slurry can also be guaranteed; that is, the distance between the inner wall of the container and the outer wall of the slurry demagnetizing cylinder 10 can be reduced, thereby improving the demagnetization effect of the battery slurry near the inner wall of the container, and then improving the overall demagnetization effect of the battery slurry. The use of the slurry demagnetizing cylinder 10 of the present application can effectively remove the magnetic material in the battery slurry, and effectively improve the demagnetization efficiency and demagnetization effect of the battery slurry. Using the slurry demagnetizing cylinder 10 of the present application to demagnetize the battery slurry is beneficial to improving the performance of the battery.

[0065] It should be noted that the center tube 11 has openings at both ends, and the openings at both ends of the center tube 11 are connected to the first inner cavity inside the center tube 11. The openings at both ends of the center tube 11 can be used as the slurry inlet and slurry outlet of the center tube 11 respectively, so that the interior of the center tube 11 forms a battery slurry flow channel for the battery slurry to flow. The first magnetic material layer 12 can be set on the inner wall of the center tube 11, or it can be set on the outer wall of the center tube 11. When the first magnetic material layer 12 is set on the inner wall of the center tube 11, the first magnetic material layer 12 can directly adsorb and remove the magnetic substances in the battery slurry flowing through the inner cavity of the center tube 11, and the electromagnetic force can pass through the side wall of the center tube 11 to indirectly adsorb and remove the magnetic substances in the battery slurry flowing through the outside of the center tube 11. When the first magnetic material layer 12 is arranged on the outer wall of the central tube 11, the first magnetic material layer 12 can directly adsorb and remove the magnetic substances in the battery slurry flowing through the outside of the central tube 11, and the electromagnetic force can pass through the side wall of the central tube 11 to indirectly adsorb and remove the magnetic substances in the battery slurry flowing through the inner cavity of the central tube 11.

[0066] In some embodiments, the inner diameter of the slurry demagnetization cylinder 10 is 1 mm to 20 mm. Setting the inner diameter of the slurry demagnetization cylinder 10 within this range allows the battery slurry to have a higher flow rate, thereby improving the demagnetization efficiency; at the same time, the battery slurry flowing through the slurry demagnetization cylinder 10 has a better demagnetization effect.

[0067] It is understandable that the inner diameter of the slurry demagnetizing cylinder 10 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm and any value within the range formed by any two of the above values.

[0068] In some embodiments, the inner diameter of the slurry demagnetization cylinder 10 is 3 mm to 10 mm. Setting the inner diameter of the slurry demagnetization cylinder 10 within the above range can further improve the demagnetization effect of the battery slurry and alleviate the problem of slurry clogging in the slurry demagnetization cylinder 10 due to the inner diameter of the slurry demagnetization cylinder 10 being too small.

[0069] In some embodiments, the thickness of the first magnetic material layer 12 is greater than 0 and less than or equal to 10 mm. Furthermore, the thickness of the first magnetic material layer 12 is 0.5 mm to 5 mm. By controlling the thickness of the first magnetic material layer 12 within the above range, the magnetic substance in the battery slurry can be better adsorbed and removed. It is understood that the thickness of the first magnetic material layer 12 can be 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, and any value within the range formed by any two of the above values.

[0070] See also Figure 2 In some embodiments, the slurry demagnetizing cylinder 10 further includes a second magnetic material layer 13, which is arranged on the side of the central cylinder 11 away from the first magnetic material layer 12. It can be understood that when the first magnetic material layer 12 is arranged on the inner wall of the central cylinder 11, the second magnetic material layer 13 is arranged on the outer wall of the central cylinder 11; when the first magnetic material layer 12 is arranged on the outer wall of the central cylinder 11, the second magnetic material layer 13 is arranged on the inner wall of the central cylinder 11. That is, magnetic material layers are provided on both the outer and inner walls of the central cylinder 11. This arrangement can better remove the magnetic substances in the battery slurry flowing through the outside and inside of the central cylinder 11 at the same time, further improving the demagnetization effect of the battery slurry.

[0071] It should be noted that when the first magnetic material layer 12 and the second magnetic material layer 13 are respectively provided on the two side walls of the central tube 11, the first magnetic material layer 12 and the second magnetic material layer 13 are arranged with opposite poles. That is, the north pole of the first magnetic material layer 12 faces the south pole of the second magnetic material layer 13, or the south pole of the first magnetic material layer 12 faces the north pole of the second magnetic material layer 13.

[0072] In some embodiments, the thickness of the second magnetic material layer 13 is greater than 0 and less than or equal to 10 mm. Furthermore, the thickness of the second magnetic material layer 13 is 0.5 mm to 5 mm. By controlling the thickness of the second magnetic material layer 13 within the above range, the magnetic substance in the battery slurry can be better adsorbed and removed. It is understood that the thickness of the second magnetic material layer 13 can be 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, and any value within the range formed by any two of the above values.

[0073] In some embodiments, the first magnetic material layer 12 and the second magnetic material layer 13 each independently include one or more of a neodymium iron boron magnet, a ferrite magnet, a samarium cobalt magnet, or an alnico magnet. Using these magnets as the materials for the first magnetic material layer 12 and the second magnetic material layer 13 can effectively demagnetize magnetic substances in the battery slurry. It is understood that the magnetic materials of the first magnetic material layer 12 and the second magnetic material layer 13 can be the same or different.

[0074] In some embodiments, the center tube 11 is made of one or more of plastic, metal, or inorganic non-metallic materials. Specifically, the plastic includes one or more of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyurethane (PU), polystyrene (PS), or polymethyl methacrylate (PMMA). The metal includes one or more of aluminum alloy or stainless steel. The inorganic non-metallic material includes one or more of aluminum oxide or zirconium oxide.

[0075] In some embodiments, the wall thickness of the central tube 11 is 1 mm to 30 mm, and can optionally be 5 mm to 15 mm. Controlling the wall thickness of the central tube 11 within this range allows the central tube 11 to serve as a carrier for the first magnetic material layer 12 and the second magnetic material layer 13. During the demagnetization process, the central tube 11 can withstand the impact of the battery slurry flow. Furthermore, the wall thickness of the central tube 11 is not too thick to significantly affect the flow rate of the battery slurry.

[0076] It can be understood that the wall thickness of the central tube 11 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 28mm, 30mm and any value within the range formed by any two of the above values.

[0077] The following describes a method for preparing the slurry demagnetization cylinder 10, taking a specific example of the slurry demagnetization cylinder 10 as an example. The slurry demagnetization cylinder 10 includes a first magnetic material layer 12 and a second magnetic material layer 13. The preparation method includes the following steps: magnetic material is disposed on the inner and outer walls of the central cylinder 11 by chemical vapor deposition, physical vapor deposition, magnetron sputtering, or 3D printing, thereby forming the first magnetic material layer 12 and the second magnetic material layer 13 on the central cylinder 11. It is understood that the first magnetic material layer 12 and the second magnetic material layer 13 can be formed simultaneously or in steps.

[0078] See also Figure 3 、 Figure 4 and Figure 5 In some embodiments, the second aspect of the present application provides a slurry demagnetization assembly 20, comprising an outer cylinder 21 and the slurry demagnetization cylinder 10 of the first aspect of the present application. The outer cylinder 21 has a second inner cavity; the slurry demagnetization cylinder 10 is placed in the second inner cavity; and the outer wall of the slurry demagnetization cylinder 10 is spaced from the inner wall of the outer cylinder 21 to form a first slurry flow channel 22; the inner cavity of the slurry demagnetization cylinder 10 forms a second slurry flow channel 23.

[0079] The above-mentioned slurry demagnetization component 20 of the present application is formed by placing the above-mentioned slurry demagnetization cylinder 10 of the present application in the second inner cavity of the outer cylinder 21; and spacing the outer wall of the slurry demagnetization cylinder 10 from the inner wall of the outer cylinder 21 to form a first slurry flow channel 22; the inner cavity of the slurry demagnetization cylinder 10 forms a second slurry flow channel 23. When the above-mentioned slurry demagnetization component 20 is used to demagnetize the battery slurry, the battery slurry is passed into the first slurry flow channel 22 and the second slurry flow channel 23. During the flow of the battery slurry, the magnetic substances in the battery slurry in the first slurry flow channel 22 and the second slurry flow channel 23 are adsorbed and removed by the first magnetic material layer 12 and the second magnetic material layer 13 on the slurry demagnetization cylinder 10.

[0080] Since the slurry demagnetizing cylinder 10 is a hollow structure, the battery slurry can also flow in its inner cavity, and it will not occupy too large a flow channel area, and the flow rate of the battery slurry will be less affected. The battery slurry can be demagnetized at a faster speed, effectively improving the demagnetization efficiency of the battery slurry. In addition, the slurry demagnetization component 20 does not need to set a larger distance between the inner wall of the outer cylinder 21 and the outer wall of the slurry demagnetization cylinder 10, and can also ensure the flow rate of the battery slurry, and can improve the demagnetization effect of the battery slurry near the inner wall of the outer cylinder 21, thereby improving the overall demagnetization effect of the battery slurry. The use of the slurry demagnetization component 20 of the present application can effectively remove magnetic substances in the battery slurry, and effectively improve the demagnetization efficiency and demagnetization effect of the battery slurry.

[0081] It can be understood that when the slurry demagnetization component 20 is used, the outer cylinder 21 in the slurry demagnetization component 20 can be fixed. After the slurry demagnetization is completed, the slurry demagnetization cylinder 10 can be taken out from the outer cylinder 21, and the magnetic material adsorbed on the side wall of the slurry demagnetization cylinder 10 can be cleaned.

[0082] In some embodiments, the outer cylinder 21 is colinear with the axis of the slurry demagnetizing cylinder 10. That is, the center axis of the outer cylinder 21 overlaps with the center axis of the slurry demagnetizing cylinder 10. This allows the slurry demagnetizing cylinder 10 to be located directly in the center of the second inner cavity of the outer cylinder 21. This makes the distance between the inner wall of the outer cylinder 21 and the outer wall of the slurry demagnetizing cylinder 10 more uniform along the circumference of the slurry demagnetizing cylinder 10, eliminating the situation where the spacing is excessively large in some areas and very small in others. This further improves the demagnetization effect on the battery slurry.

[0083] In some embodiments, the spacing between the outer wall of the slurry demagnetization cylinder 10 and the inner wall of the outer cylinder 21 is 1 mm to 20 mm. That is, the width of the first slurry flow channel 22 is 1 mm to 20 mm. Setting the width of the first slurry flow channel 22 within this range not only ensures a higher flow rate for the battery slurry, resulting in higher demagnetization efficiency for the slurry demagnetization assembly 20, but also improves the demagnetization effect on the battery slurry.

[0084] It can be understood that the distance between the outer wall of the slurry magnetic cylinder 10 and the inner wall of the outer cylinder 21 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm and any value within the range formed by any two of the above values.

[0085] In some embodiments, the distance between the outer wall of the slurry demagnetization cylinder 10 and the inner wall of the outer cylinder 21 is 3 mm to 10 mm. That is, the width of the first slurry flow channel 22 is 3 mm to 10 mm. Setting the width of the first slurry flow channel 22 within this range can further improve the demagnetization effect of the battery slurry and alleviate slurry blockage in the first slurry flow channel 22 due to an undersized inner diameter.

[0086] See also Figure 6 In some embodiments, the third aspect of the present application provides a slurry demagnetization device 30. The slurry demagnetization device 30 includes a housing 31 and the slurry demagnetization assembly 20 of the second aspect of the present application. There are multiple slurry demagnetization assemblies 20, and each of the multiple slurry demagnetization assemblies 20 is disposed in the housing 31.

[0087] The housing 31 is used to combine multiple slurry demagnetization assemblies 20 described above to form an integrated slurry demagnetization device 30. When using the slurry demagnetization device 30 to remove magnetic material from battery slurry, the battery slurry is passed through each slurry demagnetization assembly 20 for demagnetization. The housing 31 integrates the multiple slurry demagnetization assemblies 20 into one, effectively improving the efficiency of battery slurry demagnetization.

[0088] It should be noted that the shell 31 in the slurry demagnetization device 30 mainly serves to accommodate the slurry demagnetization component 20; during the demagnetization process of the battery slurry, the battery slurry does not flow in the gap between the inner wall of the shell 31 and the outer wall of the outer cylinder 21 in each slurry demagnetization component 20.

[0089] In some embodiments, each slurry demagnetization assembly 20 is extended along the axial direction of the housing 31. Each slurry demagnetization assembly 20 can perform demagnetization operation simultaneously or independently.

[0090] In some embodiments, a fourth aspect of the present application provides a method for demagnetizing battery slurry. The method comprises the following steps: passing the battery slurry to be demagnetized into the slurry demagnetization assembly 20 of the second aspect of the present application, or into the slurry demagnetization device 30 of the third aspect of the present application; and allowing the battery slurry to flow through the first slurry flow channel 22 and the second slurry flow channel 23 of the slurry demagnetization assembly 20.

[0091] In this way, as the battery slurry flows through the first slurry flow channel 22 and the second slurry flow channel 23 of the slurry demagnetization assembly 20, the magnetic material in the battery slurry is effectively adsorbed and removed by the first magnetic material layer 12 and the second magnetic material layer 13 in the slurry demagnetization cylinder 10. This battery slurry demagnetization method can quickly and effectively remove the magnetic material in the battery slurry, and has a good demagnetization effect on the battery slurry and a high demagnetization efficiency.

[0092] It is understood that the battery slurry to be demagnetized can be any battery slurry containing magnetic substances. In some specific examples, the battery slurry includes one or more of a lithium battery positive electrode slurry or a lithium battery negative electrode slurry.

[0093] In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, the application will be further described in detail below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its applications. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0094] If no specific techniques or conditions are specified in the examples, the experiments were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. All reagents or instruments used without specifying the manufacturer are commercially available conventional products.

[0095] Example 1:

[0096] (1) Preparation of slurry demagnetization cylinder

[0097] A PVC plastic tube with an inner diameter of 5mm and a wall thickness of 1mm was selected as the central tube. A 1mm thick layer of NdFeB magnet material was deposited on the inner wall of the central tube using laser chemical vapor deposition as the first magnetic material layer. A 2mm thick layer of NdFeB magnet material was deposited on the outer wall of the central tube using vacuum evaporation physical vapor deposition as the second magnetic material layer to form the slurry demagnetization tube. The inner diameter of the slurry demagnetization tube was 3mm.

[0098] (2) Slurry demagnetization component assembly

[0099] The demagnetizing cylinder prepared in step (1) above is placed in a plastic outer cylinder, so that the inner wall of the outer cylinder and the outer wall of the demagnetizing cylinder are spaced apart to form a first slurry flow channel, and the inner cavity of the demagnetizing cylinder serves as a second slurry flow channel; and the axis of the demagnetizing cylinder and the outer cylinder are aligned, thereby assembling to form a demagnetizing assembly. The width of the first slurry flow channel is 3 mm, and the width of the second slurry flow channel is 3 mm.

[0100] (3) Assembly of slurry demagnetization device

[0101] The three slurry demagnetization components assembled in the above step (2) are placed in parallel in the shell, and the slurry demagnetization components are fixed to the shell to form a slurry demagnetization device.

[0102] Example 2:

[0103] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the inner diameter of the central cylinder is 3 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 1 mm.

[0104] Example 3:

[0105] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the inner diameter of the central cylinder is 12 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 10 mm.

[0106] Example 4:

[0107] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the inner diameter of the central cylinder is 22 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 20 mm.

[0108] Example 5:

[0109] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the thickness of the first magnetic material layer deposited on the inner wall of the central cylinder is 0.5 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 4 mm.

[0110] Example 6:

[0111] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the inner diameter of the central cylinder is 20 mm, and the thickness of the first magnetic material layer deposited on the inner wall of the central cylinder is 5 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 10 mm.

[0112] Example 7:

[0113] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the thickness of the second magnetic material layer deposited on the outer wall of the central tube is 0.5 mm.

[0114] Example 8:

[0115] This embodiment is basically the same as embodiment 1, with the only difference being that in step (1), the thickness of the second magnetic material layer deposited on the outer wall of the central tube is 5 mm.

[0116] Example 9:

[0117] This embodiment is basically the same as embodiment 1, with the only difference being that in step (2), the distance between the outer wall of the slurry removing magnetic cylinder and the inner wall of the outer cylinder is 1 mm, that is, the width of the first slurry flow channel is 1 mm.

[0118] Example 10:

[0119] This embodiment is basically the same as embodiment 1, with the only difference being that in step (2), the distance between the outer wall of the slurry removing magnetic cylinder and the inner wall of the outer cylinder is 10 mm, that is, the width of the first slurry flow channel is 10 mm.

[0120] Example 11:

[0121] This embodiment is basically the same as the embodiment 1, with the only difference being that in step (1), an aluminum alloy tube is used as the central tube, and samarium cobalt magnets are used as the materials of the first magnetic material layer and the second magnetic material layer.

[0122] Example 12:

[0123] This embodiment is basically the same as embodiment 6, with the only difference being that in step (1), no second magnetic material layer is provided on the outer wall of the central cylinder, and the thickness of the first magnetic material layer is 7 mm; accordingly, the inner diameter of the slurry demagnetizing cylinder and the width of the second slurry flow channel are both 6 mm.

[0124] Comparative Example 1:

[0125] A commercially available NdFeB solid magnetic rod was used to replace the slurry demagnetization cylinder in Example 3. The diameter of the magnetic rod was the same as that of the slurry demagnetization cylinder. Because the solid magnetic rod lacked a second slurry flow channel, it presented a significant flow resistance to the battery slurry. To ensure the flow rate of the battery slurry, the inner diameter of the outer cylinder was increased so that the width of the first slurry flow channel was 13 mm.

[0126] Performance testing method:

[0127] Battery slurry demagnetization rate test

[0128] Step 1: Take M1 mass of lithium battery positive electrode slurry, dilute and fully disperse it with NMP (N-methylpyrrolidone) solvent, divide the diluted and dispersed slurry into two parts, take one part of the diluted and dispersed slurry, and use a magnetic rod to extract all the magnetic particles in the slurry; after fully rinsing the magnetic particles on the magnetic rod with solvent, filter the magnetic particles in the solvent onto sticky paper and dry them; use a jomesa cleanliness tester to test the metallic glossy particles on the sticky paper, and count the total number N1 of magnetic particles of different sizes and the number M1 of magnetic particles with a particle size less than 20μm.

[0129] Step 2: Take another portion of the diluted and dispersed slurry, load the slurry into the drum, and place the slurry demagnetization component of the present application in the drum, so that the slurry flows in the first slurry flow channel and the second slurry flow channel, and at the same time, the slurry is adsorbed and demagnetized. After a certain period of demagnetization, the slurry demagnetization component is removed;

[0130] Use a magnetic rod to extract all the remaining magnetic particles in the slurry; after fully rinsing the magnetic particles on the magnetic rod with a solvent, filter the magnetic particles in the solvent onto sticky paper and dry them; use a Jomesa cleanliness tester to test the metallic glossy particles on the sticky paper, and count the total number N2 of magnetic particles of different sizes in the slurry after demagnetization by the slurry demagnetization component of this application and the number M2 of magnetic particles with a particle size less than 20μm.

[0131] Step 3: Calculate the total demagnetization rate and the demagnetization rate of magnetic particles with a particle size less than 20μm.

[0132] Total demagnetization rate W1%= (N1-N2) / N1*100%;

[0133] The demagnetization rate of magnetic particles with a particle size of less than 20μm is W2% = (M1-M2) / M1*100%.

[0134] The demagnetization effects of the slurry demagnetization devices of the above-mentioned embodiments and comparative examples of the present application on the positive electrode slurry of lithium batteries are shown in Table 1.

[0135] Table 1

[0136]

[0137] It can be seen from Table 1 that the slurry demagnetization assembly of each embodiment of the present application has a good demagnetization effect on the battery slurry; and, because it adopts a hollow slurry demagnetization cylinder, compared with a solid magnetic rod of the same diameter, when the width of the first slurry flow channel is the same, the slurry demagnetization assembly of the present application has less impact on the flow rate of the battery slurry and has a higher demagnetization efficiency.

[0138] In Comparative Example 1, a solid magnetic rod was used instead of the slurry demagnetization cylinder in Example 3. The diameter of the magnetic rod was the same as that of the slurry demagnetization cylinder in Example 3. However, the demagnetization effect on battery slurry was significantly reduced. The overall demagnetization rate was significantly reduced, especially for magnetic particles with a particle size of less than 20 μm.

[0139] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0140] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A slurry demagnetization drum, characterized in that: include: a central tube having a first inner cavity; and A first magnetic material layer is provided on the inner wall or the outer wall of the central tube.

2. The slurry demagnetization cylinder according to claim 1, characterized in that: The inner diameter of the slurry demagnetization cylinder is 1 mm to 20 mm.

3. The slurry demagnetization cylinder according to claim 2, characterized in that: The inner diameter of the slurry demagnetization cylinder is 3mm~10mm.

4. The slurry demagnetization drum according to claim 1, characterized in that: The thickness of the first magnetic material layer is greater than 0 and less than or equal to 10 mm.

5. The slurry demagnetization drum according to claim 4, characterized in that: The thickness of the first magnetic material layer is 0.5 mm to 5 mm.

6. The slurry demagnetization drum according to any one of claims 1 to 5, characterized in that: The slurry demagnetization cylinder also includes: The second magnetic material layer is provided on a side of the central tube away from the first magnetic material layer.

7. The slurry demagnetization drum according to claim 6, characterized in that: The thickness of the second magnetic material layer is greater than 0 and less than or equal to 10 mm.

8. The slurry demagnetization cylinder according to claim 7, characterized in that: The thickness of the second magnetic material layer is 0.5 mm to 5 mm.

9. The slurry demagnetization cylinder according to claim 6, characterized in that: The first magnetic material layer and the second magnetic material layer each independently include one or more of a neodymium iron boron magnet, a ferrite magnet, a samarium cobalt magnet or an alnico magnet.

10. The slurry demagnetization drum according to any one of claims 1 to 5 and 7 to 9, characterized in that: The material of the central tube includes one or more of plastic, metal or inorganic non-metallic materials.

11. The slurry demagnetization drum according to claim 10, characterized in that: The slurry demagnetization cylinder satisfies at least one of the following (1) to (3): (1) The plastic includes one or more of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyurethane, polystyrene or polymethyl methacrylate; (2) The metal includes one or more of aluminum alloy or stainless steel; (3) The inorganic non-metallic material includes one or more of aluminum oxide and zirconium oxide.

12. A slurry demagnetization component, characterized in that: include: an outer cylinder having a second inner cavity; and The slurry demagnetizing cylinder according to any one of claims 1 to 11, wherein the slurry demagnetizing cylinder is used to be placed in the second inner cavity, the outer wall of the slurry demagnetizing cylinder and the inner wall of the outer cylinder are spaced apart to form a first slurry flow channel, and the inner cavity of the slurry demagnetizing cylinder forms a second slurry flow channel.

13. The slurry demagnetization assembly according to claim 12, characterized in that: The outer cylinder and the axis of the slurry demagnetizing cylinder are collinear.

14. The slurry demagnetization assembly according to claim 12 or 13, characterized in that: The distance between the outer side wall of the slurry demagnetizing cylinder and the inner side wall of the outer cylinder is 1 mm to 20 mm.

15. The slurry demagnetization assembly according to claim 14, characterized in that: The distance between the outer side wall of the slurry demagnetizing cylinder and the inner side wall of the outer cylinder is 3 mm to 10 mm.

16. A slurry demagnetization device, characterized in that: include: case; and The slurry demagnetization assembly according to any one of claims 12 to 15, wherein the slurry demagnetization assembly is placed in the shell.

17. A method for demagnetizing battery slurry, characterized in that: include: The battery slurry is passed into the slurry demagnetization assembly according to any one of claims 12 to 15, or into the slurry demagnetization device according to claim 16; and the battery slurry is made to flow through the first slurry flow channel and the second slurry flow channel.

18. The battery slurry demagnetization method according to claim 17, characterized in that: The battery slurry includes one or more of lithium battery positive electrode slurry or lithium battery negative electrode slurry.

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