Impurity removal device for slurry, and battery manufacturing apparatus

Abstract

The present application discloses an impurity removal device for a slurry. The impurity removal device for the slurry is used for removing impurities in an electrode sheet slurry, and comprises a first pipe and a flow disturbance mechanism. The first pipe is used for conveying the slurry, and comprises a pipe body and a magnetic lining; the magnetic lining is arranged on the inner circumferential surface of the pipe body. The flow disturbance mechanism is at least partially arranged in the first pipe. In the process of conveying the slurry in the first pipe, part of the slurry can be in a turbulent state by means of the flow disturbance mechanism, thereby being conducive to increasing the contact area of the slurry and the magnetic lining, and further improving the removal rate of magnetic impurities in the slurry.

Description

Slurry impurity removal device and battery manufacturing equipment

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410725041.0, filed on June 5, 2024, entitled “Slurry impurity removal device and battery manufacturing equipment”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery manufacturing equipment, in particular to a slurry impurity removal device and battery manufacturing equipment. BACKGROUND

[0004] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] In the process of manufacturing batteries, it is necessary to remove the magnetic impurities of the slurry coated on the electrode sheet. How to improve the removal rate of magnetic impurities in the slurry is a problem to be solved in the manufacture of batteries.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a slurry impurity removal device and battery manufacturing equipment, which can improve the removal rate of magnetic impurities in the slurry.

[0008] In a first aspect, the present application provides a slurry impurity removal device for removing impurities from electrode sheet slurry. The slurry impurity removal device comprises a first pipeline and a flow disturbance mechanism. The first pipeline is used to transport the slurry and comprises a pipeline body and a magnetic lining. The magnetic lining is arranged on the inner circumferential surface of the pipeline body. The flow disturbance mechanism is at least partially arranged in the first pipeline.

[0009] In the technical scheme of the present application, during the transportation of the slurry in the first pipeline, the flow disturbance mechanism can make part of the slurry in a turbulent state, which is conducive to increasing the contact area between the slurry and the magnetic lining, thereby improving the removal rate of magnetic impurities in the slurry.

[0010] In one or more embodiments of the first aspect, the flow disturbance mechanism comprises a second pipeline and a plurality of nozzles. The extension direction of the second pipeline is parallel to the extension direction of the first pipeline, and the second pipeline is used to transport a cleaning liquid. The nozzles are connected to the second pipeline and protrude from the outer circumferential surface of the second pipeline. The plurality of nozzles are arranged at intervals along the extension direction of the second pipeline.

[0011] The disturbance mechanism can clean the magnetic inner liner by passing the cleaning liquid, thereby reducing the difficulty of maintaining the magnetic inner liner and improving the maintenance efficiency of the magnetic inner liner.

[0012] In one or more embodiments of the first aspect, the spray direction of the nozzle is directed to the central axis of the first pipe.

[0013] In the above scheme, since the spray direction of the nozzle is directed to the central axis of the first pipe, the reflection and diffusion of the cleaning liquid in the pipe are facilitated, so that the cleaning liquid can cover most of the area in the first pipe, thereby improving the cleaning effect of the cleaning liquid on the first pipe.

[0014] In one or more embodiments of the first aspect, the second pipe includes a main pipe and a plurality of branch pipes, the extension direction of the main pipe is parallel to the extension direction of the first pipe, one end of the branch pipe is connected to the main pipe, the plurality of branch pipes are arranged along the extension direction of the main pipe, the plurality of nozzles correspond to the plurality of branch pipes one by one, and the nozzle is arranged at the end of the branch pipe away from the main pipe.

[0015] In the above scheme, the arrangement of the plurality of nozzles and the plurality of branch pipes can further increase the disturbance effect of the disturbance mechanism and further improve the cleaning effect of the cleaning liquid on the first pipe.

[0016] In one or more embodiments of the first aspect, the branch pipe extends in the radial direction of the first pipe.

[0017] In the above scheme, the branch pipe extending in the radial direction of the first pipe can improve the structural stability of the branch pipe and reduce the risk of deformation of the branch pipe. At the same time, it is beneficial to make more slurry contact with the inner wall of the magnetic inner liner, thereby further improving the removal rate of magnetic impurities in the slurry.

[0018] In one or more embodiments of the first aspect, the diameter of the nozzle gradually decreases in the direction away from the main pipe.

[0019] In the above scheme, since the diameter of the nozzle gradually decreases in the direction away from the main pipe, the flow resistance of the slurry flowing outside the nozzle can be reduced to some extent, which is beneficial to improve the flow stability of the slurry.

[0020] In one or more embodiments of the first aspect, a plurality of disturbance mechanisms are arranged, and the plurality of disturbance mechanisms are arranged along the circumference of the first pipe.

[0021] In the above scheme, by arranging a plurality of disturbance mechanisms, the removal rate of magnetic impurities in the slurry can be further improved.

[0022] In one or more embodiments of the first aspect, the magnetic lining comprises a plurality of magnetic rings and at least one connecting ring, the plurality of magnetic rings are arranged along the axial direction of the pipeline body, and the adjacent two magnetic rings are connected by the connecting ring.

[0023] In the above scheme, the connecting ring can serve as an assembly base for the magnetic rings, thereby reducing the assembly difficulty of the magnetic lining. Meanwhile, the magnetic lining is formed by arranging a plurality of magnetic rings and at least one connecting ring along the axial direction of the pipeline body, which makes the length design of the magnetic lining more flexible and improves the adaptability of the magnetic lining.

[0024] In one or more embodiments of the first aspect, the magnetic poles of the adjacent two magnetic rings are opposite.

[0025] In the above scheme, since the magnetic poles of the adjacent two magnetic rings are opposite, the separation difficulty of the magnetic rings and the connecting ring is lower, which is conducive to reducing the maintenance difficulty of the magnetic lining.

[0026] In one or more embodiments of the first aspect, the connecting ring is a metal ring, and the magnetic ring is magnetically attracted to the connecting ring.

[0027] In the above scheme, the magnetic ring and the connecting ring are connected by magnetic attraction, which is lower in assembly cost.

[0028] In one or more embodiments of the first aspect, the slurry impurity removal device comprises at least two first pipelines connected in series, and a filtering mechanism is arranged between the adjacent two first pipelines.

[0029] In the above scheme, the filtering mechanism can filter the non-magnetic impurities in the slurry, so as to improve the purity of the slurry and the coating quality of the battery, thereby improving the reliability of the battery.

[0030] In one or more embodiments of the first aspect, the filtering mechanism comprises a magnetic filter screen.

[0031] In the above scheme, when the filtering mechanism filters the non-magnetic impurities in the slurry, the magnetic filter screen can simultaneously filter the magnetic impurities in the slurry, thereby further improving the removal rate of the magnetic impurities in the slurry.

[0032] In one or more embodiments of the first aspect, the filtering mechanism is magnetically attracted to the magnetic lining.

[0033] In the above scheme, the filtering mechanism and the magnetic lining are connected by magnetic attraction, which is lower in assembly cost.

[0034] In one or more embodiments of the first aspect, the first pipeline further comprises a ceramic lining, and the ceramic lining is arranged between the pipeline body and the magnetic lining.

[0035] In the above scheme, the ceramic lining is arranged to make the material selection of the pipeline body more flexible, and to reduce the design cost of the first pipeline.

[0036] In a second aspect, the application provides a battery manufacturing device comprising the slurry impurity removal device in one or more embodiments of the first aspect.

[0037] In the above scheme, the slurry impurity removal device in one or more embodiments of the first aspect has a high removal rate of magnetic impurities, and thus the battery manufacturing device comprising the slurry impurity removal device in one or more embodiments of the first aspect has a high production quality.

[0038] The above description is only a summary of the technical solutions of the application. In order to enable one skilled in the art to better understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the application. Moreover, the same reference numerals in all the drawings represent the same elements. In the drawings:

[0040] FIG. 1 is a schematic diagram of a partial structure of a battery manufacturing device according to some embodiments of the application;

[0041] FIG. 2 is a schematic diagram of a structure of a slurry impurity removal device according to some embodiments of the application;

[0042] FIG. 3 is a schematic diagram of a structure of a slurry impurity removal device according to some other embodiments of the application;

[0043] FIG. 4 is a schematic diagram of a structure of a turbulence mechanism according to some embodiments of the application;

[0044] FIG. 5 is a schematic diagram of a partial structure of a slurry impurity removal device according to some embodiments of the application;

[0045] FIG. 6 is a schematic diagram of a structure of a filtering mechanism according to some embodiments of the application.

[0046] The reference numerals in the detailed description are as follows:

[0047] 2000 - battery manufacturing equipment; 201 - slurry stirring device; 202 - slurry impurity removing device; 203 - slurry coating device; 21 - first pipe; 211 - pipe body; 212 - magnetic inner lining; 2121 - magnetic ring; 2122 - connecting ring; 213 - ceramic inner lining; 22 - turbulence mechanism; 221 - second pipe; 2211 - main pipe; 2212 - branch pipe; 222 - nozzle; 23 - filtering mechanism; 24 - connecting piece. DETAILED DESCRIPTION

[0048] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill 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 the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0051] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0054] In the present application, the battery cell can include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The shape of the battery cell can include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell can include, but is not limited to, a cylindrical battery cell, a square battery cell, a soft-pack battery cell, and a blade battery cell according to the packaging method.

[0055] In some high-power applications such as electric vehicles, the application of the battery includes three levels: battery cell, battery module, and battery. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impacts, heat, vibration, etc. The battery refers to the final state of the battery system loaded into the electric vehicle. The battery referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for packaging one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cell.

[0056] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a case, and the end cap closes the opening of the case to define a receiving space for accommodating the electrode assembly.

[0057] The electrode assembly is accommodated in the accommodation space, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer is protruded from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer is protruded from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to pass a large current without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. In addition, the forming method of the electrode assembly can include, but is not limited to, a winding type or a laminated type.

[0058] Coating is to cover a thin layer of coating material in liquid or powder form on the surface of an object such as fabric, paper, metal foil or plate. And coating is an indispensable step in the process of manufacturing battery cells.

[0059] In the production process of battery cells, the positive electrode active material is coated on the positive electrode current collector, and the negative electrode active material is coated on the negative electrode current collector. The coating process is used, that is, the prepared paste-like thick slurry (positive electrode active material or negative electrode active material) is uniformly, continuously or intermittently coated on the substrate (positive electrode current collector or negative electrode current collector), and the thickness of each coating position needs to have high consistency and the coating thickness needs to be controlled within the tolerance range required by the process.

[0060] Magnetic impurities in the slurry need to be removed before slurry coating to reduce the risk of battery cell short circuit and increase the internal resistance of the battery cell caused by magnetic impurities, but the removal rate of magnetic impurities of the general slurry impurity removal device is low. In view of this, the application provides a slurry impurity removal device for removing impurities from electrode slurry. The slurry impurity removal device includes a first pipeline and a flow disturbance mechanism. The first pipeline is used to transport the slurry and includes a pipeline body and a magnetic lining. The magnetic lining is arranged on the inner circumferential surface of the pipeline body. The flow disturbance mechanism is at least partially arranged in the first pipeline. During the transportation of the slurry in the first pipeline, the slurry is in a turbulent state by the flow disturbance mechanism, which is conducive to increasing the contact area between the slurry and the magnetic lining, thereby improving the removal rate of magnetic impurities in the slurry.

[0061] The technical solution described in the embodiments of the application is suitable for removing impurities from electrode slurry.

[0062] According to some embodiments of the present application, referring to FIGS. 2-4, the present application provides a slurry impurity removal device 202 for removing impurities from a slurry of an electrode tab, the slurry impurity removal device 202 comprising a first pipe 21 for conveying the slurry, the first pipe 21 comprising a pipe body 211 and a magnetic lining 212 arranged on an inner circumferential surface of the pipe body 211, and a flow disturbing mechanism 22 arranged at least partially in the first pipe 21.

[0063] The magnetic impurities in the slurry can include, but are not limited to, fine particles of metals such as iron, cobalt, nickel, and alloys thereof.

[0064] The extension direction of the first pipe 21 can be linear, zigzag, arc-shaped, etc.

[0065] The material of the pipe body 211 can include stainless steel, iron, copper, polyvinyl chloride, chlorinated polyvinyl chloride, polyethylene, glass fiber reinforced plastic, aluminum plastic composite material, etc.

[0066] In some embodiments, the magnetic lining 212 is a whole magnetic pipe.

[0067] The flow disturbing mechanism 22 can include a mixer, and / or a baffle, and / or a diffuser, and / or a cyclone, and / or a flow disturbing fin, etc.

[0068] The flow disturbing mechanism 22 is arranged at least partially in the first pipe 21, meaning that the fluid state of the slurry will change during the process of the slurry flowing through the flow disturbing mechanism 22. As an example, referring to FIGS. 2 and 3, during the process of the slurry flowing along the central axis of the first pipe 21, more slurry will flow to the surface of the magnetic lining 212 due to the arrangement of the flow disturbing mechanism 22, thereby increasing the probability of the magnetic impurities being adsorbed by the magnetic lining 212.

[0069] In the technical solution of the embodiments of the present application, during the process of the slurry being conveyed in the first pipe 21, the flow disturbing mechanism 22 can make part of the slurry in a turbulent flow state, which is conducive to increasing the contact area between the slurry and the magnetic lining 212, thereby being conducive to improving the removal rate of the magnetic impurities in the slurry.

[0070] According to some embodiments of the present application, referring to FIGS. 2-4, the flow disturbing mechanism 22 comprises a second pipe 221 and a plurality of nozzles 222, the extension direction of the second pipe 221 is parallel to the extension direction of the first pipe 21, and the second pipe 221 is used for conveying a cleaning liquid. The nozzles 222 are connected to the second pipe 221 and protrude from the outer circumferential surface of the second pipe 221, and the plurality of nozzles 222 are arranged at intervals along the extension direction of the second pipe 221.

[0071] In some embodiments, the second pipe 221 and the plurality of nozzles 222 are located inside the first pipe 21, and the second pipe 221 and the nozzles 222 are both made of non-magnetic material, which reduces the risk of the magnetic impurities being adsorbed by the second pipe 221 or the nozzles 222 and being difficult to clean.

[0072] The cleaning liquid can include, but is not limited to, water, N-methyl pyrrolidone cleaning agent, etc.

[0073] The second pipe 221 can be located inside or outside the first pipe 21.

[0074] In some embodiments, a valve is arranged on the second pipe 221 or the nozzles 222, and when the valve is opened, the cleaning liquid can be sprayed by the nozzles 222 towards the magnetic lining 212, and when the valve is closed, the cleaning liquid cannot flow out of the nozzles 222.

[0075] In some embodiments, the cleaning liquid can be pumped into the second pipe 221 by a pump.

[0076] The arrangement of the second pipe 221 and the nozzles 222 means that the flow disturbing mechanism 22 can have both flow disturbing and cleaning functions.

[0077] In the above scheme, while the flow disturbing mechanism 22 improves the removal rate of the magnetic impurities in the slurry, the flow disturbing mechanism 22 can also pass the cleaning liquid to clean the magnetic lining 212, thereby reducing the difficulty of maintaining the magnetic lining 212 and improving the efficiency of maintaining the magnetic lining 212.

[0078] According to some embodiments of the present application, please refer to FIGS. 2-4, the spraying direction of the nozzles 222 is directed to the central axis of the first pipe 21.

[0079] Please refer to FIGS. 2 and 3, the dashed line in FIG. 2 shows the central axis of the first pipe 21.

[0080] The spraying direction of the nozzles 222 is directed to the central axis of the first pipe 21, which means that after the cleaning liquid is sprayed out of the nozzles 222, the reflection of the cleaning liquid on the magnetic lining 212 is more uniform, that is, the distribution area of the cleaning liquid is also relatively large.

[0081] In the above scheme, since the spraying direction of the nozzles 222 is directed to the central axis of the first pipe 21, it is beneficial to the reflection and diffusion of the cleaning liquid in the pipe, so that the cleaning liquid can cover most of the area in the first pipe 21, which is beneficial to improving the cleaning effect of the cleaning liquid on the first pipe 21.

[0082] According to some embodiments of the present application, referring to FIGS. 2-4, the second pipe 221 includes a main pipe 2211 and a plurality of branch pipes 2212, the main pipe 2211 extends in parallel with the first pipe 21, one end of each of the branch pipes 2212 is connected to the main pipe 2211, the plurality of branch pipes 2212 are arranged along the extension direction of the main pipe 2211, and the plurality of nozzles 222 correspond to the plurality of branch pipes 2212 one-to-one, and each of the nozzles 222 is arranged at one end of the corresponding branch pipe 2212 away from the main pipe 2211.

[0083] In some embodiments, the main pipe 2211 serves as an assembly base of the branch pipes 2212 on one hand, and can be used to deliver the cleaning liquid to the branch pipes 2212 and the nozzles 222 on the other hand.

[0084] The branch pipes 2212 and the nozzles 222 can both have a certain turbulence effect.

[0085] In the above scheme, the arrangement of the plurality of nozzles 222 and the plurality of branch pipes 2212 can further increase the turbulence effect of the turbulence mechanism 22, and further improve the cleaning effect of the cleaning liquid on the first pipe 21.

[0086] According to some embodiments of the present application, referring to FIGS. 2-4, the branch pipes 2212 extend along the radial direction of the first pipe 21.

[0087] Compared with the embodiment in which the extension direction of the branch pipes 2212 intersects the radial direction of the first pipe 21, in the embodiment in which the branch pipes 2212 extend along the radial direction of the first pipe 21, the structural stability of the joint between the branch pipes 2212 and the main pipe 2211 is higher.

[0088] When the length and arrangement position of the branch pipes 2212 are fixed, the branch pipes 2212 extend along the radial direction of the first pipe 21, and the turbulence effect is better.

[0089] In the above scheme, the extension of the branch pipes 2212 along the radial direction of the first pipe 21 is conducive to improving the structural stability of the branch pipes 2212 and reducing the risk of deformation of the branch pipes 2212. At the same time, it is conducive to making more slurry contact with the inner wall of the magnetic lining 212, thereby further improving the removal rate of the magnetic impurities in the slurry.

[0090] According to some embodiments of the present application, referring to FIGS. 2-4, the diameter of the nozzles 222 gradually decreases in the direction away from the main pipe 2211.

[0091] The gradual decrease of the diameter of the nozzles 222 in the direction away from the main pipe 2211 means that the transition between the outer surface of the nozzle 222 and the outer surface of the branch pipe 2212 is relatively gentle, which is conducive to reducing the flow resistance of the slurry.

[0092] In the above scheme, since the diameter of the nozzle 222 gradually decreases in the direction away from the main pipe 2211, the flow resistance of the slurry flowing outside the nozzle 222 can be reduced to some extent, and the flow stability of the slurry can be improved.

[0093] According to some embodiments of the present application, referring to FIGS. 2-4, the plurality of turbulence mechanisms 22 are arranged along the circumference of the first pipe 21.

[0094] Referring to FIG. 3, in some embodiments, the plurality of turbulence mechanisms 22 are four, which are arranged in an array along the circumference of the first pipe 21.

[0095] In the above scheme, the removal rate of the magnetic impurities in the slurry can be further improved by arranging the plurality of turbulence mechanisms 22.

[0096] According to some embodiments of the present application, referring to FIGS. 2-5, the magnetic lining 212 includes a plurality of magnetic rings 2121 and at least one connecting ring 2122, the plurality of magnetic rings 2121 are arranged along the axial direction of the pipe body 211, and adjacent two magnetic rings 2121 are connected by the connecting ring 2122.

[0097] The slurry can flow inside the magnetic ring 2121, and the magnetic impurities in the slurry can be adsorbed by the magnetic ring 2121 to be removed from the slurry during the flow of the slurry.

[0098] In some embodiments, the magnetic ring 2121 can be connected to the connecting ring 2122 by a fastener or a buckle structure.

[0099] When designing the magnetic lining 212 with the same length, compared with a whole magnetic pipe, the magnetic pipe is divided into a plurality of magnetic rings 2121, the weight of a single magnetic ring 2121 is lighter, and the assembly difficulty is lower. Meanwhile, when designing the magnetic lining 212 with different lengths, only the number of the magnetic rings 2121 needs to be increased or decreased, and the design flexibility is higher.

[0100] In the above scheme, the connecting ring 2122 can serve as an assembly base of the magnetic ring 2121, which reduces the assembly difficulty of the magnetic lining 212. Meanwhile, the magnetic lining 212 is formed by arranging the plurality of magnetic rings 2121 and the at least one connecting ring 2122 along the axial direction of the pipe body 211, which makes the length design of the magnetic lining 212 more flexible and improves the adaptability of the magnetic lining 212.

[0101] According to some embodiments of the present application, referring to FIGS. 2-5, the magnetic poles of adjacent two magnetic rings 2121 are opposite.

[0102] The magnetic poles of the two adjacent magnetic rings 2121 are opposite, meaning that when the magnetic ring 2121 and the connecting ring 2122 are separated, the magnetic attraction between the two adjacent magnetic rings 2121 does not need to be overcome, and the disassembly difficulty is lower.

[0103] In the above scheme, because the magnetic poles of the two adjacent magnetic rings 2121 are opposite, the separation difficulty of the magnetic ring 2121 and the connecting ring 2122 is lower, which is conducive to reducing the maintenance difficulty of the magnetic lining 212.

[0104] According to some embodiments of the present application, referring to FIGS. 2-5, the connecting ring 2122 is a metal ring, and the magnetic ring 2121 is magnetically attracted to the connecting ring 2122.

[0105] Because the connecting ring 2122 is a metal ring, the magnetic ring 2121 can be adsorbed to the surface of the metal ring, and the additional cost of arranging more connection structures is saved.

[0106] In some embodiments, the magnetic poles of the two adjacent magnetic rings 2121 are opposite, and the connecting ring 2122 is a metal ring, and the magnetic ring 2121 is magnetically attracted to the connecting ring 2122. In this embodiment, the thickness of the connecting ring 2122 can be increased or decreased to make the repulsive force between the two adjacent magnetic rings 2121 smaller than the adsorption force between the magnetic ring 2121 and the connecting ring 2122, and then the magnetic ring 2121 is magnetically attracted to the connecting ring 2122.

[0107] In the above scheme, the magnetic ring 2121 and the connecting ring 2122 are connected by magnetic attraction, and the assembly cost is lower.

[0108] According to some embodiments of the present application, referring to FIGS. 2-6, the slurry impurity removal device 202 includes at least two first pipes 21 connected head to tail, and a filter mechanism 23 is arranged between the two adjacent first pipes 21.

[0109] The filter mechanism 23 can filter non-magnetic solid particles in the slurry, such as sand, dust, oxides, sulfides, etc.

[0110] In some embodiments, the filter mechanism 23 includes a filter screen, and the mesh size of the filter screen can be 150 mesh, 200 mesh, 250 mesh, 300 mesh, etc.

[0111] In the above scheme, the filter mechanism 23 can filter non-magnetic impurities in the slurry to improve the purity of the slurry and the coating quality of the battery, thereby improving the reliability of the battery.

[0112] According to some embodiments of the present application, referring to FIGS. 2-6, the filter mechanism 23 includes a magnetic filter screen.

[0113] The filtering mechanism 23 comprises a magnetic filter screen, meaning that the filtering mechanism 23 can further adsorb the magnetic impurities in the slurry in addition to filtering the non-magnetic impurities in the slurry.

[0114] In the above scheme, the magnetic filter screen can filter the magnetic impurities in the slurry at the same time when the filtering mechanism 23 filters the non-magnetic impurities in the slurry, further improving the removal rate of the magnetic impurities in the slurry.

[0115] According to some embodiments of the present application, referring to FIGS. 2-6, the filtering mechanism 23 is magnetically connected to the magnetic lining 212.

[0116] In some embodiments, the filtering mechanism 23 can be adsorbed to the magnetic lining 212 by the magnetic member.

[0117] In some embodiments, the magnetic lining 212 comprises a metal ring and a magnetic ring 2121, the connecting ring 2122 is the metal ring, and the magnetic ring 2121 is magnetically connected to the connecting ring 2122. The filtering mechanism 23 can also be magnetically connected to the surface of one of the connecting rings 2122.

[0118] In the above scheme, the filtering mechanism 23 and the magnetic lining 212 are connected by magnetism, which is lower in assembly cost.

[0119] According to some embodiments of the present application, referring to FIGS. 2-6, the first pipeline 21 further comprises a ceramic lining 213, which is arranged between the pipeline body 211 and the magnetic lining 212.

[0120] The arrangement of the ceramic lining 213 makes the material selection of the pipeline body 211 more flexible, for example, the magnetic material can be selected or the non-magnetic material can be selected. In some embodiments, the material of the pipeline body 211 can be selected as the magnetic material, for example, the magnetic metal, which can make the first pipeline 21 have higher structural stability. In some embodiments, the material of the pipeline body 211 can be selected as the non-magnetic material, for example, the plastic, which is beneficial to reduce the processing cost of the pipeline body 211.

[0121] In the above scheme, the arrangement of the ceramic lining 213 makes the material selection of the pipeline body 211 more flexible, which is beneficial to reduce the design cost of the first pipeline 21.

[0122] According to some embodiments of the present application, referring to FIG. 1, the present application provides a battery manufacturing equipment 2000, which comprises the slurry impurity removal device 202 in one or more embodiments described above.

[0123] In some embodiments, the battery manufacturing device 2000 comprises a slurry stirring device 201, a slurry impurity removing device 202, and a slurry coating device 203. The slurry stirred by the slurry stirring device 201 flows through the slurry impurity removing device 202 and is then delivered to the slurry coating device 203. The slurry impurity removing device 202 removes impurities in the slurry. The slurry coating device 203 coats the slurry on which impurities have been removed on a current collector to form a pole piece.

[0124] In the above solution, the slurry impurity removing device 202 in one or more embodiments described above has a high removal rate of magnetic impurities. Therefore, the battery manufacturing device 2000 comprising the slurry impurity removing device 202 in one or more embodiments described above has a high production quality.

[0125] According to some embodiments of the present application, referring to FIGS. 2-6, the present application provides a slurry impurity removing device 202 for removing impurities in a pole piece slurry. The slurry impurity removing device 202 comprises at least two first pipes 21 connected end to end and a turbulence mechanism 22. A filter mechanism 23 is arranged between adjacent two first pipes 21. In some embodiments, two connecting pieces 24 are further arranged between adjacent two first pipes 21. The two connecting pieces 24 correspond to the first pipes 21 one by one. The connecting pieces 24 are fixed to the first pipes 21. The filter mechanism 23 is fixed to one of the connecting pieces 24. The two connecting pieces 24 are connected by fasteners. This facilitates the splicing between the plurality of first pipes 21, thereby simplifying the arrangement difficulty of the slurry impurity removing device 202 with different lengths.

[0126] The first pipe 21 is used for delivering slurry and comprises a pipe body 211 and a magnetic lining 212. The magnetic lining 212 is arranged on the inner circumferential surface of the pipe body 211. The turbulence mechanism 22 is at least partially arranged in the first pipe 21. The filter mechanism 23 comprises a magnetic filter screen. The filter mechanism 23 is magnetically connected to the magnetic lining 212.

[0127] The turbulence mechanism 22 comprises a second pipe 221 and a plurality of nozzles 222, the second pipe 221 extends in parallel with the first pipe 21, and the second pipe 221 is used to transport the cleaning liquid. The nozzles 222 are connected to the second pipe 221 and protrude from the outer circumferential surface of the second pipe 221, and the plurality of nozzles 222 are arranged at intervals along the extension direction of the second pipe 221. The spraying direction of the nozzles 222 is directed to the central axis of the first pipe 21. The second pipe 221 comprises a main pipe 2211 and a plurality of branch pipes 2212, the main pipe 2211 extends in parallel with the first pipe 21, one end of the branch pipe 2212 is connected to the main pipe 2211, the plurality of branch pipes 2212 are arranged at intervals along the extension direction of the main pipe 2211, the plurality of nozzles 222 correspond to the plurality of branch pipes 2212 one by one, and the nozzles 222 are arranged at the end of the branch pipes 2212 away from the main pipe 2211. The branch pipe 2212 extends in the radial direction of the first pipe 21. The diameter of the nozzles 222 gradually decreases in the direction away from the main pipe 2211.

[0128] The turbulence mechanism 22 is provided in plurality, and the plurality of turbulence mechanisms 22 are arranged at intervals in the circumferential direction of the first pipe 21.

[0129] The magnetic lining 212 comprises a plurality of magnetic rings 2121 and at least one connecting ring 2122, the plurality of magnetic rings 2121 are arranged in the axial direction of the pipe body 211, and the adjacent two magnetic rings 2121 are connected through the connecting ring 2122. The magnetic poles of the adjacent two magnetic rings 2121 are opposite.

[0130] The branch pipe 2212 and the nozzle 222 can take into account the turbulence effect on the slurry and the cleaning effect on the magnetic lining 212, thereby improving the impurity removal rate of the slurry and improving the maintenance efficiency of the slurry impurity removal device 202.

[0131] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slurry impurity removal device for impurity removal of electrode slurry, characterized by, The application relates to a slurry impurity removing device. The device comprises: a first pipeline for conveying slurry, which comprises a pipeline body and a magnetic lining arranged on the inner circumferential surface of the pipeline body; 2. The slurry impurity removal apparatus of claim 1, wherein, a flow disturbing mechanism arranged at least partially in the first pipeline. The flow disturbing mechanism comprises: a second pipeline, which is parallel to the first pipeline in the extending direction, and is used for conveying cleaning liquid; 3. The slurry impurity removal apparatus of claim 2, wherein, a plurality of nozzles connected to the second pipeline and protruding from the outer circumferential surface of the second pipeline, and the nozzles are arranged at intervals along the extending direction of the second pipeline.

4. The slurry impurity removal apparatus of claim 2 or 3, wherein, The spraying direction of the nozzles is directed to the central axis of the first pipeline.

5. The slurry impurity removal apparatus of claim 4, wherein, The second pipeline comprises a main pipeline and a plurality of branch pipelines, the main pipeline is parallel to the first pipeline in the extending direction, one end of the branch pipeline is connected to the main pipeline, the branch pipelines are arranged at intervals along the extending direction of the main pipeline, the nozzles and the branch pipelines are one-to-one corresponding, and the nozzles are arranged at the end of the branch pipelines away from the main pipeline.

6. The slurry impurity removal apparatus of claim 4 or 5, wherein, The branch pipelines extend in the radial direction of the first pipeline.

7. The slurry impurity removal apparatus of any one of claims 1-6, wherein, The diameter of the nozzles gradually decreases in the direction away from the main pipeline.

8. The slurry impurity removal device of any one of claims 1-7, wherein, A plurality of flow disturbing mechanisms are arranged at intervals in the circumferential direction of the first pipeline.

9. The slurry impurity removal apparatus of claim 8, wherein, The magnetic lining comprises a plurality of magnetic rings and at least one connecting ring, the magnetic rings are arranged in the axial direction of the pipeline body, and the connecting ring is arranged between two adjacent magnetic rings.

10. The slurry impurity removal apparatus of claim 8 or 9, wherein, The magnetic poles of two adjacent magnetic rings are opposite.

11. The slurry impurity removal device of any one of claims 1-10, wherein, The connecting ring is a metal ring, and the magnetic ring is magnetically connected to the connecting ring.

12. The slurry impurity removal apparatus of claim 11, wherein, The slurry impurity removing device comprises at least two first pipelines connected in series, and a filtering mechanism is arranged between two adjacent first pipelines.

13. The slurry impurity removal apparatus of claim 11 or 12, wherein, The filtering mechanism comprises a magnetic filter screen.

14. The slurry impurity removal device of any one of claims 1-13, wherein, The filtering mechanism is magnetically connected to the magnetic lining.

15. A battery manufacturing apparatus, characterized by comprising: The first pipeline further comprises a ceramic lining arranged between the pipeline body and the magnetic lining. The application further relates to a slurry impurity removing device comprising any one of the devices according to claims 1-14.

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