Filtering device

Abstract

The invention relates to a filtering device and use thereof, in particular to a magnetic filtering device and use thereof. The present application can provide a structure of a filter device and use thereof that do not cause damage such as bending of a magnet even when the magnet having a longer length and stronger magnetic force is applied to improve the processing efficiency of a magnetic filter device and the removal efficiency of foreign matter. The invention further provides a structure and use of the filtering device, wherein regular cleaning or magnet replacement of the filtering device is facilitated, and meanwhile damage such as bending is prevented.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2022-0129923, filed on October 11, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present application relates to a filtering device. Background Art

[0003] So-called magnetic filtration devices can be used to remove foreign matter from fluids such as electrode slurry or fuel.

[0004] The electrode may be manufactured by preparing a slurry for an electrode by dispersing ingredients such as an electrode active material in a solvent, and coating, drying, and rolling the slurry on a current collector.

[0005] However, in the process of preparing the slurry, during the process such as grinding, mixing and / or pressurizing of the active material, foreign matter having magnetism or easily magnetized may be mixed in. If such foreign matter is included in the electrode, it may cause problems such as reduction in charging or discharging efficiency.

[0006] Therefore, magnetic filters can be applied to remove these foreign particles.

[0007] Such a magnetic filter is generally performed by a method in which a fluid such as slurry is brought into contact with a filtering portion including a magnet to remove foreign matter.

[0008] At this time, if Figure 1 As shown, the filter part has a form in which one end of each of the plurality of rod-shaped magnets 100 is fixed to a cover 200. Generally, the fluid is filtered by Figure 1 When the rod-shaped magnet 100 moves in the direction indicated by the arrow in FIG. 1 , the foreign matter is removed by the magnet 100. One end of the rod-shaped magnet 100 is usually fixed to the cover 200 by welding, bolts, etc.

[0009] Currently, most rod magnets used in this process are magnets with a length of about 100 mm to 150 mm and exhibit a magnetic force of about 10,000 Gauss.

[0010] When a magnet having a longer length and a stronger magnetic force is applied, a larger amount of fluid can be effectively processed and foreign matter can be removed more effectively.

[0011] However, if the length of the magnets is longer and the magnetic force is increased, the repulsive or attractive force acting between the magnets becomes stronger, so Figure 2 As shown, for example, there may be a problem that the rod-shaped magnet 100 is bent.

[0012] To solve such a problem, a method of fixing the other end of the rod magnet 100 not fixed by the cover 200 with a fixing device such as the cover 200 may be considered. However, if both ends of the rod magnet are fixed, it is difficult to replace the rod magnet or clean the filter. Summary of the invention

[0013] [Technical issues]

[0014] The present application relates to a filter device and its use, in particular to a magnetic filter device and its use. The present application aims to provide a structure of a filter device and its use that will not cause damage such as bending of the magnet even when a magnet with a longer length and stronger magnetic force is used to improve the processing efficiency of the magnetic filter device and the removal efficiency of foreign matter. The present application also aims to provide a structure of a filter device and its use that facilitates regular cleaning of the filter device or replacement of the magnet while preventing damage such as bending.

[0015] [Technical solution]

[0016] The present application relates to a filtering device, in particular to a magnetic filtering device.

[0017] The filter device may include a housing providing a space for removing foreign matter from a fluid and a filter portion existing within the housing.

[0018] The filtering part may include a cover, a plurality of rod-shaped magnets and a clamp, wherein the cover is formed to fix the plurality of rod-shaped magnets in a state where the plurality of rod-shaped magnets are separated from each other by a certain interval, each rod-shaped magnet having one end fixed to the cover, and the clamp is installed at the other end of each rod-shaped magnet to maintain the interval between the rod-shaped magnets.

[0019] Here, the rod-shaped magnet may be a rod-shaped magnet having a length of 200 mm or longer, and / or may be a rod-shaped magnet exhibiting a magnetic force exceeding 10000 Gauss.

[0020] Here, the clamp may be a non-metal clamp and may be detachably mounted on the rod-shaped magnet.

[0021] Here, the fluid applied to the filtering device may be electrode slurry.

[0022] Here, the housing may include an inlet for introducing the fluid and an outlet for discharging the fluid.

[0023] Here, the rod-shaped magnet may be a rod-shaped magnet having a length of 200 mm or more and exhibiting a magnetic force exceeding 10000 Gauss.

[0024] Here, the rod-shaped magnet may have a maximum cross-sectional dimension in the range of 15 mm to 40 mm.

[0025] Here, the plurality of rod-shaped magnets may be arranged such that a ratio (D / I) of a maximum cross-sectional dimension (D) of the rod-shaped magnets to an interval (I) between the rod-shaped magnets is in a range of 1 to 5.

[0026] Here, the interval between the rod-shaped magnets may be in the range of 5 mm to 30 mm.

[0027] Here, multiple rod-shaped magnets can be arranged so that some magnets are arranged at a certain interval along a first direction, and other magnets are arranged at a certain interval along a second direction. At the same time, by passing through any one of the rod-shaped magnets arranged at a certain interval along the first direction, the angle formed by the second direction and the first direction is in the range of 80 degrees to 100 degrees.

[0028] In this arrangement, a plurality of rod-shaped magnets may be arranged such that a maximum cross-sectional dimension of the rod-shaped magnets is in a range of 15 mm to 40 mm, and a ratio (D / I) of a maximum cross-sectional dimension (D) to an interval (I) between the rod-shaped magnets is in a range of 1 to 5.

[0029] The clamp applied to the filtering device may be a plastic clamp, such as a diamagnetic plastic clamp.

[0030] The clamp applied to the filtering device may be an acetal clamp.

[0031] The present application also relates to a method of removing foreign matter from a fluid using a filtering device.

[0032] The method may include the step of contacting the fluid with a rod-shaped magnet of a filter portion within a housing of the filter device.

[0033] The present application also relates to a method for manufacturing an electrode using the filtering device.

[0034] The method may include the step of contacting the electrode slurry with a rod-shaped magnet of a filter portion within a housing of a filter device.

[0035] The method may further include coating the electrode slurry on the current collector after contacting the rod-shaped magnet.

[0036] [Beneficial Effects]

[0037] The present application can provide a structure of a filter device and its use that does not cause damage such as bending of the magnet even when a magnet having a longer length and a stronger magnetic force is used to improve the processing efficiency of the magnetic filter device and the removal efficiency of foreign matter. The present application can also provide a structure of a filter device and its use that facilitates regular cleaning of the filter device or replacement of the magnet while preventing damage such as bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 and Figure 2 It is an exemplary diagram for explaining the structure and problems of a filtering portion in a filtering device of the conventional technology.

[0039] Figure 3 Schematic diagram showing a state where an exemplary filtration device of the present application is viewed from the top.

[0040] Figure 4 is a schematic diagram showing a state where an exemplary filtering portion of the present application is viewed from the side.

[0041] Figure 5 and Figure 6 is a schematic diagram showing an example form of a fixture in a filtering section.

[0042] [Explanation of Reference Numerals]

[0043] 200, 1000: Cover

[0044] 100, 2000, 2000a, 2000b, 2000c, 2000d, 2000e: Rod magnets

[0045] 100a: One end of the rod magnet

[0046] 30: Space

[0047] 10: Entrance

[0048] 20: Export

[0049] 3000: Fixture

[0050] 3001: Framework

[0051] 3002: Connection part DETAILED DESCRIPTION

[0052] The present application describes a filtering device.

[0053] The filter device of the present application can be used to remove foreign matter from a fluid, and in one example, the foreign matter can be a magnetic material or a magnetized material.

[0054] If the fluid applied to the filter device of the present application includes a magnetic material or a magnetized material, the type thereof is not particularly limited. In one example, the fluid may be an electrode slurry.

[0055] The slurry for the electrode is generally prepared by dispersing ingredients such as an electrode active material in a solvent. Therefore, the slurry for the electrode may include the electrode active material.

[0056] The specific type of the electrode active material is not particularly limited, and materials generally used to form a positive electrode or a negative electrode can be used.

[0057] For example, lithium transition metal oxides can be used as the active material for forming the positive electrode. Specifically, layered compounds such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2), or compounds substituted by one or more transition metals; lithium iron oxides such as LiFe3O4; lithium manganese oxides such as Li 1+c1 Mn 2-c1 O4 (0≤c1≤0.33), LiMnO3, LiMn2O3 or LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5 or Cu2V2O7; lithium nickel oxide of Ni-site type represented by the formula LiNi 1- c2 M c2 O2 (where M is at least one selected from the group consisting of Co, Mn, Al, Cu, Fe, Mg, B and Ga, and 0.01≤c2≤0.3); lithium manganese composite oxides represented by the formula LiMn 2-c3 M c3 O2 (where M is at least one selected from the group consisting of Co, Ni, Fe, Cr, Zn and Ta, and 0.01≤c3≤0.1) or Li2Mn3MO8 (where M is at least one selected from the group consisting of Fe, Co, Ni, Cu and Zn); lithium nickel cobalt manganese (NCM) composite oxides; lithium nickel cobalt manganese aluminum (NCMA) composite oxides; LiMn2O4 in which some Li in the formula is replaced by alkaline earth metal ions, etc., but not limited thereto.

[0058] As the negative electrode active material, compounds capable of reversibly inserting and extracting lithium can be used. Specific examples may include carbonaceous materials such as artificial graphite, natural graphite, graphitized carbon fiber and amorphous carbon; metal compounds capable of alloying with lithium such as Si, Al, Sn, Pb, Zn, Bi, In, Mg, Ga, Cd, Si alloys, Sn alloys or Al alloys; metal oxides capable of doping and undoping lithium such as SiOa (0 < a < 2), SnO2, vanadium oxides and lithium vanadium oxides; or composite materials containing metal compounds and carbonaceous materials such as Si-C composite materials or Sn-C composite materials, etc., and any one or a mixture of two or more of the above can be used.

[0059] Based on solid content, the electrode active material can be present in the slurry at a ratio ranging from about 80 wt% to 99.5 wt%. In another example, the ratio can be about 85 wt% or more, 90 wt% or more, or 95 wt% or more, or can also be about 99 wt% or less, or 98 wt% or less. The weight ratio is the ratio of the total weight of the solid content in the slurry. Therefore, for example, if the slurry includes a solvent, the ratio is the ratio of the total weight of the slurry based on the solvent.

[0060] The slurry may also contain a binder. The binder is used to improve the adhesion between the active materials and the adhesion between the active material layer and the current collector layer. Examples of binders are not particularly limited, and may be selected from, for example, PVDF (polyvinylidene fluoride), PVA (polyvinyl alcohol), SBR (styrene butadiene rubber), PEO (polyethylene oxide), CMC (carboxyl methyl cellulose), cellulose acetate, cellulose acetate butylate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, One or more of the group consisting of polyols, cellulose, cyanoethyl sucrose, pullulan, polymethylmethacrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate and polyarylate.

[0061] In one example, relative to the electrode active material of 100 weight portions, can include adhesive with the amount of 0.001 weight portion or more, 0.005 weight portion or more, 0.01 weight portion or more, 0.05 weight portion or more, 0.1 weight portion or more, 0.5 weight portion or more or 1 weight portion or more.Can include adhesive with 20 weight portions or less, 15 weight portions or less, 10 weight portions or less, 9 weight portions or less, 8 weight portions or less, 7 weight portions or less, 6 weight portions or less, 5 weight portions or less, 4 weight portions or less, 3 weight portions or less, 2 weight portions or less or 1.5 weight portions or less ratio.The ratio of adhesive can also have the scope between any one in the above-mentioned upper limit and any one in the above-mentioned lower limit.

[0062] If necessary, the slurry may further include a conductive material. As the conductive material, any known material may be used without particular limitation as long as it has conductivity and does not cause chemical changes in the secondary battery. For example, graphite such as natural graphite or artificial graphite; carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black or thermal black; conductive fibers such as carbon fibers or metal fibers; conductive tubes such as carbon nanotubes (CNTs); metal powders such as fluorocarbons, aluminum or nickel powders; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; and / or conductive materials such as polyphenyl derivatives, etc. may be used.

[0063] If included, the conductive material may be included in the active material layer in an amount of 0.1 to 20 parts by weight, or 0.3 to 10 parts by weight, relative to 100 parts by weight of the electrode active material, but is not limited thereto.

[0064] The type of solvent in the slurry in which these components are dispersed is also not particularly limited. For example, the solvent may be exemplified by water, methanol, ethanol, isopropanol, acetone, dimethyl sulfoxide, formamide and / or dimethylformamide, etc., but is not limited thereto.

[0065] The filtration device of the present application can be used to remove foreign matter from a fluid such as the above-mentioned electrode slurry.

[0066] The filter device of the present application may include a housing and a filter portion existing in the housing, and the housing provides a space for removing foreign matter from the fluid.

[0067] Figure 3 An example of a filter device is shown below, which is a schematic diagram of the filter device viewed from the top. Figure 3 As shown, the housing of the filter device may include an inlet 10 for introducing a fluid such as an electrode slurry, a space 30 for performing removal of foreign matter contained in the fluid, and an outlet 20 for discharging the fluid.

[0068] A filter part may be disposed in the space 30 of such a filter device. The filter part may include at least a cover, a rod-shaped magnet, and a clamp as described below.

[0069] like Figure 3 As exemplarily shown, the cover 1000 may be provided in the form of a cover covering the upper portion of the space 30, and a rod-shaped magnet 2000 having one end fixed to the cover 1000 may be included in the filtering part.

[0070] At this time, as shown in the figure, the rod-shaped magnet 2000 may be included in a plurality of filter parts, and when the filter device is viewed from the top, the rod-shaped magnet 2000 may be fixed to the cover 1000 in a state of being spaced apart from each other by a certain interval. The rod-shaped magnet 2000 may be fixed to the cover 1000 generally by welding or bolts, etc.

[0071] Figure 4 This is a schematic diagram showing a state where only the filtering portion of the filtering device is viewed from the side.

[0072] As shown in the drawing, in the filtering part, one end of the rod-shaped magnet 2000 is fixed to the cover 1000 in a state where the rod-shaped magnets 2000 are spaced apart from each other at a certain interval.

[0073] As an additional component, the filtering portion of the present application may include a clamp installed at the other end of each rod-shaped magnet (ie, the end opposite to the end fixed to the cover) to maintain the interval between the rod-shaped magnets.

[0074] In the present application, the clamp is a member detachably mounted on the other end of each rod-shaped magnet, which is a means for maintaining intervals between the plurality of rod-shaped magnets.

[0075] In the present application, by attaching the clamp to the end of the rod-shaped magnet as described above, even when a magnet having a longer length and a stronger magnetic force is applied as the rod-shaped magnet, damage such as bending of the rod-shaped magnet during use can be prevented. In addition, by applying such a clamp to be detachable, regular cleaning or magnet replacement required for the filtering device can be effectively performed.

[0076] Figure 5 1 is a schematic diagram of a rod-shaped magnet 2000 mounted with a fixture, viewed from the end direction of the fixture.

[0077] As shown in the figure, the jig may include a plurality of frames 3001 providing spaces in which a single rod-shaped magnet 2000 may be inserted or installed, and a connecting portion 3002 connecting the plurality of frames 3001 to each other. Here, the shapes of the frames 3001 and the connecting portion 3002 are not particularly limited, and they may be formed into appropriate shapes in consideration of the arrangement or spacing of the rod-shaped magnets.

[0078] In the present application, by applying such a jig, a magnet having a longer length and a stronger magnetic force can be applied as the rod-shaped magnet.

[0079] In one example, as a rod-shaped magnet, the present application can use a length ( Figure 4 The H in the figure is a rod-shaped magnet of 200 mm or more. In another example, the length of the rod-shaped magnet may also be approximately 205 mm or more, 210 mm or more, 215 mm or more, 220 mm or more, 225 mm or more, 230 mm or more, 235 mm or more, 240 mm or more, 245 mm or more, 250 mm or more, 255 mm or more, 260 mm or more, or 265 mm or more, and there is no particular limit to the upper limit. For example, the length of the rod-shaped magnet may be approximately 600 mm or less, 580 mm or less, 560 mm or less, 540 mm or less, 520 mm or less, 500 mm or less, 480 mm or less, 460 mm or less, 440 mm or less, 420 mm or less, 400 mm or less, 380 mm or less, 360 mm or less, 340 mm or less, 320 mm or less, 300 mm or less, or 280 mm or less.

[0080] In another example, the rod magnet may be a rod magnet that exhibits a magnetic force exceeding 10,000 Gauss. In another example, the magnetic force of the rod-shaped magnet can be approximately 11,000 Gauss or greater, 12,000 Gauss or greater, 13,000 Gauss or greater, or 14,000 Gauss or greater, and the upper limit is not particularly limited, and can be approximately 30,000 Gauss or less, 29,000 Gauss or less, 28,000 Gauss or less, 27,000 Gauss or less, 26,000 Gauss or less, 25,000 Gauss or less, 24,000 Gauss or less, 23,000 Gauss or less, 22,000 Gauss or less, 21,000 Gauss or less, 20,000 Gauss or less, 19,000 Gauss or less, 18,000 Gauss or less, 17,000 Gauss or less, 16,000 Gauss or less, or 15,000 Gauss or less.

[0081] The rod-shaped magnet used in the present application may be a rod-shaped magnet having any of the above-mentioned lengths, or may be a rod-shaped magnet exhibiting any of the above-mentioned magnetic forces, and in one example, it may be a rod-shaped magnet having both any of the above-mentioned lengths and any of the above-mentioned magnetic forces.

[0082] Considering that the currently used rod-shaped magnets generally have a length of about 134 mm and a magnetic force of 10,000 gauss, the above-mentioned length is very long and / or the magnetic force is very strong compared to the current length and / or magnetic force. When such a rod-shaped magnet is applied, foreign matter can be removed from the fluid more effectively, but the attractive force or repulsive force acting between the rod-shaped magnets will also become stronger, thereby possibly causing damage to the filter part, such as bending of the rod-shaped magnet. However, by applying a clamp, the present application can utilize a rod-shaped magnet with a longer length and a stronger magnetic force without causing such a problem.

[0083] In the present application, a rod-shaped magnet having an appropriate cross-sectional area while having a longer length and exhibiting a stronger magnetic force may also be applied.

[0084] For example, in this application, a cross-sectional area of ​​150 mm 2 Up to 1500 mm 2 In another example, the cross-sectional area of ​​the rod-shaped magnet may be approximately 200 mm 2 or larger, 250 mm 2 or larger, 300 mm 2 or larger, 350 mm 2 or larger, 400 mm 2 or larger, 450 mm 2 or larger, 500 mm 2 or larger, or 530 mm 2 or larger, or approximately 1400 mm 2 or smaller, 1300 mm 2 or smaller, 1200 mm 2 or smaller, 1100 mm 2 or smaller, 1000mm 2 or smaller, 900 mm 2 or smaller, 800 mm 2 or smaller, 700 mm 2 or smaller, 600 mm 2 or smaller, or 550 mm 2 or smaller.

[0085] In the present application, by applying the jig, the rod-shaped magnet can have a longer length and exhibit a stronger magnetic force, and furthermore, the rod-shaped magnet can be arranged so as to remove foreign matter more effectively.

[0086] For example, in the filtering part, the rod-shaped magnets may be arranged so that the cross-sectional area (A, unit: mm) of the rod-shaped magnets 2) to the interval (I, unit: mm) between the rod-shaped magnets (A / I) is in the range of 10 to 100. In another example, such a ratio (A / I) may be approximately 20 or more, 30 or more, 40 or more, or 45 or more, and may also be approximately 90 or less, 80 or less, 70 or less, 60 or less, or 50 or less.

[0087] By arranging the rod-shaped magnet in this state, foreign matter can be removed from the fluid more effectively.

[0088] Here, the interval between the rod-shaped magnets is not particularly limited if it satisfies the above ratio, but may be, for example, in the range of 5 mm to 30 mm. In another example, the interval may be approximately 7 mm or more, 9 mm or more, or 11 mm or more, or may be approximately 25 mm or less, 20 mm or less, or 15 mm or less.

[0089] To more effectively remove foreign matter, the arrangement of the rod-shaped magnets can be further controlled.

[0090] For example, multiple rod-shaped magnets can be Figure 6 Arrangement in the form shown. Figure 6 Schematic diagram of a rod-shaped magnet viewed from the top. As shown in the figure, a plurality of rod-shaped magnets 2000a to 2000e can be arranged such that some magnets 2000a to 2000c are arranged at predetermined intervals along an arbitrary first direction D1, and other magnets 2000a, 2000d, 2000e are arranged at predetermined intervals along a second direction D2, while passing through any one of the rod-shaped magnets 2000a to 2000c arranged along the first direction, the angle formed by the second direction D2 and the first direction D1 is in the range of 80 degrees to 100 degrees.

[0091] The rod-shaped magnets may be arranged so that the above-mentioned cross-sectional area (A) and the ratio of the cross-sectional area (A) to the interval (I) are ensured in the arrangement.

[0092] With this arrangement, a filtering portion can be formed so that foreign matter in the fluid can be removed more effectively.

[0093] Therefore, the intervals between the rod-shaped magnets are adjusted, and the shape of the jig 3000 can also be formed according to the arrangement of the rod-shaped magnets.

[0094] Reference again Figure 5 As described above, the jig may include a plurality of frames 3001 in which the rod-shaped magnets are accommodated and a connecting portion 3002 connecting the frames 3001 to the frames 3001 .

[0095] At this time, the arrangement of the frames 3001 is determined according to the desired arrangement of the rod-shaped magnets, and the frames 3001 thus arranged are connected by the connection portions 3002 .

[0096] In this fixture, the width of the frame 3001 ( Figure 5 W1 in the figure) and the width of the connecting portion 3002 ( Figure 5 The ratio W2 / W1 of W2 in FIG. 1 may be, for example, in the range of 1 to 10. In another example, the ratio W2 / W1 may be approximately 2 or more, 3 or more, 4 or more, or 5 or more, or may also be approximately 9 or less, 8 or less, 7 or less, 6 or less, or 5 or less.

[0097] Here, the width of frame 3001 ( Figure 5 W1) in the figure can be, for example, in the range of 0.5 mm to 10 mm. In another example, the width can be about 1 mm or more, 1.5 mm or more, or 2 mm or more, or can also be about 9 mm or less, 8 mm or less, 7 mm or less, 6 mm or less, 5 mm or less, 4 mm or less, 3 mm or less, or 2 mm or less.

[0098] In the jig, the length of the connecting portion 3002 can be set according to the desired spacing between the rod-shaped magnets ( Figure 5 For example, the connecting portion may have a length of about 2 mm to 30 mm. In another example, the length may be about 4 mm or more, 6 mm or more, 8 mm or more, or 10 mm or more, or may be about 25 mm or less, 20 mm or less, 15 mm or less, 14 mm or less, 13 mm or less, 12 mm or less, or 11 mm or less.

[0099] For example, the thickness of the clamp may be in the range of 1 mm to 10 mm. In another example, the ratio W2 / W1 may be about 2 mm or more, 3 mm or more, 4 mm or more, or 5 mm or more, or may be about 9 mm or less, 8 mm or less, 7 mm or less, 6 mm or less, or 5 mm or less.

[0100] By configuring the jig in this form, interference with the housing and the like can be prevented while stably maintaining the interval between the rod-shaped magnets having a longer length and a stronger magnetic force.

[0101] Such a clamp may be formed from a non-metallic material.

[0102] By forming the jig with a non-metal material, it is possible to prevent foreign matter from being generated due to interference or friction between the rod-shaped magnet or the housing and the jig.

[0103] Applicable non-metallic materials are not particularly limited. For example, plastic materials, especially so-called engineering plastic materials, can be used.

[0104] Thus, the clamp may be a plastic clamp.

[0105] In a suitable example, the clamp may be a so-called diamagnetic plastic clamp. In this application, the term diamagnetic is defined as a material having a negative magnetic susceptibility at normal temperature (about 22°C). Such diamagnetic plastic exhibits a weak repulsive force to a magnetic field. Therefore, when the clamp is made of a diamagnetic material, it exhibits an appropriate repulsive force to a rod magnet, so that the clamp can fully function without interfering with the function of the rod magnet.

[0106] If the diamagnetic plastic is a material that exhibits a negative magnetic susceptibility at normal temperature (about 22°C), it can be used without limitation, and for example, a material that exhibits a magnetic susceptibility of approximately -10 at normal temperature (about 22°C) can be used. -3 to -10 -7 or -10 -4 to -10 -6 The magnetic susceptibility of the material.

[0107] Among known engineering plastics, polyacetal is a material that exhibits a magnetic susceptibility within the above range. Therefore, in one example, the clamp may be an acetal clamp, ie, a clamp made of polyacetal.

[0108] Acetal is an engineering plastic also called polyacetal, polyoxymethylene or polyformaldehyde, etc. It is a material having high strength and exhibiting low friction, and furthermore, it exhibits the above-mentioned diamagnetic property, thereby making it possible to more effectively form a jig having a desired effect.

[0109] The method of manufacturing the jig of the above-mentioned shape using the material is not particularly limited, wherein the jig can be manufactured by a known general plastic molding method.

[0110] If the filtering device of the present application includes the above-mentioned configuration, it may include other additional configurations, and the specific types of these additional configurations are not particularly limited, wherein configurations introduced in general filtering devices may be applied.

[0111] The present application also relates to a method of removing foreign matter from a fluid using a filtration device.

[0112] The method of the present application can be performed in a usual manner, for example, by the step of contacting the fluid with a rod-shaped magnet of the filter portion in the housing of the filter device. In this case, in one example, the contact can be made while the fluid is moving, and in one example, the contact can be made while the fluid is moving in a direction substantially perpendicular to the longitudinal direction of the rod-shaped magnet. Here, the substantially perpendicular direction refers to a situation where the angle formed by the longitudinal direction of the rod-shaped magnet and the moving direction of the fluid is in the range of about 70 degrees to 110 degrees.

[0113] As mentioned above, the fluid may be a slurry for the electrode.

[0114] Thus, the present application may be a method of removing foreign matter, or a method of manufacturing an electrode, wherein the fluid is a slurry.

[0115] The method for manufacturing an electrode may include the step of contacting an electrode slurry with a rod-shaped magnet of a filter portion within a housing of a filter device. At this time, in one example, the contact may be made while the slurry is moving, and in one example, the contact may be made while the slurry is moving in a direction substantially perpendicular to the longitudinal direction of the rod-shaped magnet. Here, the substantially perpendicular direction refers to a situation where the angle formed by the longitudinal direction of the rod-shaped magnet and the moving direction of the slurry is in the range of approximately 70 to 110 degrees.

[0116] If the step of removing foreign matter using the filter device of the present application is performed, the method of manufacturing the electrode can be performed according to the usual method of manufacturing the electrode. Therefore, the method of manufacturing the electrode can also include the step of coating the electrode slurry after contacting the rod-shaped magnet on the current collector, the step of drying the coating and / or the step of winding the coating, etc., and this method can be performed in a known manner.

Claims

1. A filtering device, comprising: a housing providing a space for removing foreign matter from the fluid; and a filter portion present in said housing, Wherein, the filtering part includes a cover, a plurality of rod-shaped magnets and a clamp, The cover is formed to fix the plurality of rod-shaped magnets in a state where the plurality of rod-shaped magnets are spaced apart from each other by a certain interval, One end of each rod-shaped magnet is fixed to the cover, The clamp is mounted on the other end of each rod-shaped magnet to maintain the interval between the rod-shaped magnets. The rod magnet is a rod magnet having a length of 200 mm or more, or a rod magnet exhibiting a magnetic force exceeding 10,000 gauss, The clamp is a non-metallic clamp and is detachably mounted on the rod-shaped magnet.

2. The filtering device according to claim 1, wherein: The fluid is an electrode slurry.

3. The filtering device according to claim 1, wherein: The housing includes an inlet for introducing the fluid and an outlet for discharging the fluid.

4. The filtering device according to claim 1, wherein: The rod magnet is a rod magnet having a length of 200 mm or more and exhibiting a magnetic force exceeding 10,000 Gauss.

5. The filtering device according to claim 1, wherein: The cross-sectional area of ​​the rod-shaped magnet is 150 mm 2 Up to 1500mm 2 within the range.

6. The filtering device according to claim 5, wherein: The plurality of rod-shaped magnets are arranged such that a ratio (A / I) of a cross-sectional area (A) of the rod-shaped magnets to an interval (I) between the rod-shaped magnets is in a range of 10 to 100.

7. The filtering device according to claim 1, wherein: The intervals between the rod-shaped magnets are in the range of 5 mm to 30 mm.

8. The filtering device according to claim 1, wherein: The plurality of rod-shaped magnets are arranged such that some magnets are arranged at certain intervals along a first direction, and other magnets are arranged at a certain distance along a second direction, and while passing through any one of the rod-shaped magnets arranged at certain intervals along the first direction, the angle formed by the second direction and the first direction is in the range of 80 degrees to 100 degrees.

9. The filtering device according to claim 8, wherein: The plurality of rod-shaped magnets are arranged such that the cross-sectional area of ​​the rod-shaped magnets is between 150 mm 2 Up to 1500 mm 2 and a ratio (A / I) of the cross-sectional area (A) to the interval (I) between the rod-shaped magnets is in the range of 10 to 100.

10. The filtering device according to claim 1, wherein: The clamp is a plastic clamp.

11. The filtering device according to claim 1, wherein: The clamp is a diamagnetic plastic clamp.

12. The filtering device according to claim 1, wherein: The clamp is an acetal clamp.

13. A method for removing foreign matter from a fluid using the filter device according to claim 1, comprising: The step of bringing the fluid into contact with a rod-shaped magnet of a filter portion within a housing of the filter device.

14. A method for manufacturing an electrode using the filtering device according to claim 1, comprising: The step of bringing the electrode slurry into contact with the rod-shaped magnet of the filtration portion within the housing of the filtration device.

15. The method for manufacturing an electrode according to claim 14, comprising: The step of coating the electrode slurry after contacting the rod-shaped magnet on the current collector.

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