Slurry filtering device and battery production system

Abstract

The embodiment of the utility model provides a slurry filtering device and a battery production system.The slurry filtering device comprises a filtering body, a filtering net and a magnet adsorption part, the filtering body is provided with a filtering cavity, a mounting cavity, a slurry inlet and a slurry outlet, the filtering cavity and the mounting cavity are arranged at intervals and communicate through a channel, and the slurry inlet communicates with the filtering cavity; the slurry outlet is communicated with the mounting cavity and is used for leading out the slurry; the filter screen is located in the filter cavity and divides at least part of the filter cavity into a first cavity body and a second cavity body, the first cavity body is communicated with the slurry inlet and used for containing unfiltered slurry, and the second cavity body is communicated with the channel and used for containing filtered slurry; the magnet adsorption part is arranged in the mounting cavity and used for adsorbing metal impurities in the slurry. The slurry filtering device can improve the slurry filtering efficiency.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a slurry filtering device and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] The pole pieces of battery cells require a slurry filtration device during the production process. How to improve the filtration efficiency of the slurry filtration device is a research direction in battery technology. Utility Model Content

[0004] The present application provides a slurry filtering device and a battery production system, which can improve the filtering efficiency of the slurry.

[0005] An embodiment of the present application provides a slurry filtering device, including a filter body, a filter screen and a magnetic adsorbent, the filter body having a filter chamber, a mounting chamber, a slurry inlet and a slurry outlet, the filter chamber and the mounting chamber are spaced apart and connected through a channel, the slurry inlet is connected to the filter chamber and is used to convey slurry to the filter chamber, the slurry outlet is connected to the mounting chamber and is used to export the slurry; the filter screen is located in the filter chamber and divides at least part of the filter chamber into a first cavity and a second cavity, the first cavity is connected to the slurry inlet and is used to accommodate unfiltered slurry, the second cavity is connected to the channel and is used to accommodate filtered slurry; the magnetic adsorbent is arranged in the mounting chamber and is used to adsorb metal impurities in the slurry.

[0006] In the above technical scheme, the slurry filtering device of the embodiment of the present application has a filter chamber and an installation chamber, in which a filter net and a magnetic adsorption part are placed respectively. In this way, large particles and metal particles can be filtered out after the slurry passes through the filter chamber and the installation chamber. Therefore, the slurry filtering device can perform two filtering steps at the same time, shortening the walking path of the slurry, improving the filtering efficiency of the slurry, and thus improving the production efficiency of the battery cell.

[0007] In some embodiments, there are multiple installation cavities, which are arranged at intervals on the outer peripheral side of the filter cavity and are all connected to the slurry outlet, and each installation cavity is provided with a magnetic adsorption component.

[0008] In the above technical solution, a plurality of installation cavities are provided, and the plurality of installation cavities are provided around the outer peripheral side of the filter cavity. In this way, not only can the ability of the slurry filtering device to filter metal particles be improved, but also this arrangement method can make full use of the space and reduce the size of the slurry filtering device from its top to the bottom.

[0009] In some embodiments, the filter body includes a bottom wall facing the filter cavity, the bottom wall faces the second cavity, and the portion of the bottom wall facing the second cavity is provided with a first through hole. The filter body also has a first connecting cavity, the first connecting cavity is located on the side of the bottom wall away from the filter cavity, the first connecting cavity and the second cavity are connected through the first through hole, the first connecting cavity is connected to multiple installation cavities, and the first connecting cavity and the first through hole form a channel.

[0010] In the above technical solution, a first connecting cavity is provided to connect the plurality of installation cavities, which can simplify the connecting paths between the plurality of installation cavities and the filter cavity and is more convenient to manufacture.

[0011] In some embodiments, the mounting cavity and the first communicating cavity are arranged in a direction from top to bottom of the filter body.

[0012] In the above technical solution, the volume of the slurry remaining in the installation cavity that cannot be filtered can be reduced, thereby improving the filtering effect of the slurry.

[0013] In some embodiments, the filter body further has a second communicating cavity, which is spaced apart from the mounting cavity and connects with a plurality of mounting cavities, and the plurality of mounting cavities are connected with the slurry outlet through the second communicating cavity.

[0014] In the above technical solution, a second connecting cavity is provided to connect the multiple installation cavities, which can simplify the connecting paths between the multiple installation cavities and the slurry outlets and is more convenient to set up.

[0015] In some embodiments, the second communication cavity surrounds at least a portion of the outer circumference of the filter cavity.

[0016] In the above technical solution, the size of the filter body from the top to the bottom can be reduced, thereby improving the space utilization of the slurry filtering device in this direction.

[0017] In some embodiments, the second communication cavity and the slurry outlet are both formed at the top of the filter body.

[0018] In the above technical solution, the path for the slurry to move from bottom to top in the installation cavity can be increased, thereby improving the filtering effect.

[0019] In some embodiments, the filter body also includes a first pipeline, which has two ends opposite to each other in the extension direction, one end of the first pipeline is connected to the first cavity, and the other end forms a slurry inlet, the second connecting cavity surrounds the outer peripheral side of the filter cavity, and the first pipeline passes through the second connecting cavity and is connected to the first cavity.

[0020] In the above technical solution, the first pipeline is arranged to pass through the second communicating cavity and communicate with the first cavity, which can facilitate the communication with the first cavity and the connection with the external pipeline under the premise of setting the second communicating cavity.

[0021] In some embodiments, the magnetic attraction member is a magnetic bar.

[0022] In the above technical solution, the magnetic adsorption member is set as a magnetic bar, and the magnetic bar is a permanent magnet, so it does not need to be powered on, is easy to use, and has high reliability.

[0023] In some embodiments, the slurry outlet is formed at the top of the filter body, and the magnetic bar extends from the top to the bottom of the filter body and has a distance from the side wall of the installation cavity to allow the slurry to flow from the bottom to the top of the magnetic bar.

[0024] In the above technical solution, the magnetic rod is arranged to extend from the top to the bottom of the filter body, so that the contact path with the slurry can be increased, the magnetic rod can fully contact the slurry, and the filtering effect on the metal particles in the slurry can be improved.

[0025] In some embodiments, the filter body further comprises a plurality of convex cylinder structures which are spaced apart on the top surface of the filter body and are connected one by one with the plurality of mounting cavities, and the top end of the magnetic rod protrudes and overlaps the top surface of the convex cylinder structure.

[0026] In the above technical solution, the convex cylinder structure supports the magnetic rod and prevents the magnetic rod from falling. At the same time, it is convenient to take out the magnetic rod when it needs to be cleaned, that is, the magnetic rod can be taken out upwards.

[0027] In some embodiments, at least a portion of the inner surface of the convex cylinder structure is in contact with the magnetic rod.

[0028] In the above technical solution, the direct contact between the magnetic rod and the convex cylinder structure can reduce the slurry flowing toward the top opening of the convex cylinder structure, thereby reducing the possibility of slurry overflow.

[0029] In some embodiments, the slurry filtering device further comprises a connecting piece, which is connected to the top end of the magnetic rod and the top end of the convex cylinder structure, and fixes the magnetic rod to the convex cylinder structure.

[0030] In the above technical solution, the connection piece is provided to improve the tightness and sealing of the connection between the magnetic rod and the convex cylinder structure, reduce the possibility of the magnetic rod moving under the action of slurry and pressure, and reduce the overflow of slurry.

[0031] In some embodiments, the filter screen includes a connected barrel body and an annular protrusion. The barrel body is used to filter the slurry and has a first opening and a second opening arranged in a direction from the top to the bottom of the filter body. The first opening is connected to the slurry inlet. The annular protrusion surrounds the first opening and is connected to the side wall of the filter cavity. The inner cavity of the barrel body forms a first cavity, and the space enclosed by the barrel body, the annular protrusion, the side wall of the filter cavity and the bottom wall of the filter cavity forms a second cavity.

[0032] In the above technical solution, the filter screen is arranged as a cylindrical structure, and the cylindrical structure has a larger filtering area, so the ability of the slurry filtering device to filter large particles can be improved.

[0033] In some embodiments, the filter body further includes an annular protrusion, the annular protrusion is disposed on the side wall of the filter cavity, and the annular convex portion overlaps the annular protrusion and is connected to the annular protrusion.

[0034] In the above technical solution, the annular protrusion is provided, which can play a better role in bearing and fixing the filter screen and facilitate the connection between the filter screen and the filter body.

[0035] In some embodiments, a first through hole is provided on a portion of the bottom wall of the filter cavity facing the second cavity, the first through hole forms a partial channel, there are multiple first through holes, and the multiple first through holes are spaced apart along the outer circumference of the barrel body.

[0036] In the above technical solution, a plurality of first through holes are provided to allow more slurry to flow out of the second cavity, thereby improving the filtering efficiency of the slurry filtering device.

[0037] In some embodiments, the slurry filtering device also includes a scraping mechanism, which includes a rotating shaft and a scraper. The rotating shaft extends from the barrel body to the outside of the filter body. The scraper is connected to the rotating shaft and sweeps the slurry attached to the inner surface of the barrel body under the drive of the rotating shaft.

[0038] In the above technical solution, a scraping mechanism is provided to sweep away large particles and slurry attached to the inner surface of the scraper barrel body, thereby improving the situation where the filtering efficiency is reduced due to clogging of the filter screen.

[0039] In some embodiments, the slurry filtering device further includes a driving member located outside the filter body, wherein the driving member is connected to an end of the rotating shaft and is used to drive the rotating shaft to rotate.

[0040] In the above technical solution, a driving member is provided to improve the scraping efficiency of the scraping mechanism and further improve the situation where the filtering efficiency decreases due to the clogging of the filter screen.

[0041] In some embodiments, a second through hole is provided on the bottom wall of the filter cavity, and the second through hole is connected to the second opening and is used to discharge impurities.

[0042] In the above technical solution, a second through hole is provided to facilitate the discharge of large particles in the slurry that are intercepted by the filter screen.

[0043] In some embodiments, the filter body further includes a sewage outlet and a sewage holding chamber, wherein the sewage holding chamber is located on the side of the bottom wall of the filter chamber away from the filter chamber and is connected to the second through hole, and the sewage outlet is connected to the sewage holding chamber and is located on the side of the sewage holding chamber away from the filter chamber.

[0044] In the above technical solution, the sewage holding chamber and the sewage outlet are provided, which can facilitate temporary storage of large particles of impurities when the sewage outlet is closed. In addition, the sewage outlet is provided on the side of the sewage holding chamber away from the filter chamber, which can facilitate sewage discharge under the action of gravity.

[0045] In some embodiments, the slurry filtering device further includes a frame, the filter body is disposed on the frame, and a plurality of rollers are disposed at the bottom end of the frame.

[0046] In the above technical solution, the movement of the slurry filtering device can be facilitated.

[0047] In a second aspect, an embodiment of the present application further provides a battery production system, comprising the above-mentioned slurry filtering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0049] Figure 1 A schematic diagram of the structure of a battery production system provided in some embodiments of the present application;

[0050] Figure 2 A schematic diagram of the structure of a slurry filtering device provided in some embodiments of the present application;

[0051] Figure 3 A schematic diagram of the structure of a slurry filtering device provided in some embodiments of the present application at another angle;

[0052] Figure 4 for Figure 3 A partial cross-sectional view at AA;

[0053] Figure 5 A schematic diagram of the structure of a slurry filtering device provided in some embodiments of the present application at another angle;

[0054] Figure 6 for Figure 5 A partial cross-sectional view at CC;

[0055] Figure 7 for Figure 4 The enlarged view of point B in the middle;

[0056] Figure 8 for Figure 6 Enlarged view of point D in the middle.

[0057] The reference numerals of the specific embodiments are as follows:

[0058] 100. Battery production system; 200. Slurry filtering device; 300. Slurry making device; 400. Coating device; 500. Drying device;

[0059] 1. Filter body; 11. Filter cavity; 111. First cavity; 112. Second cavity; 12. Installation cavity; 13. Slurry inlet; 14. Slurry outlet; 15. Bottom wall; 151. Second through hole; 16. Channel; 161. First through hole; 162. First communicating cavity; 17. Second communicating cavity; 18. First pipeline; 19. Convex cylinder structure; 101. Annular protrusion; 102. Drain port; 103. Drain cavity;

[0060] 2. filter screen; 21. cylinder body; 22. annular convex portion;

[0061] 3. Magnetic adsorption parts;

[0062] 4. Connectors;

[0063] 5. Scraping mechanism; 51. Rotating shaft; 52. Scraping member; 53. Driving member;

[0064] 6. Frame; 61. Roller. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0067] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may 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 refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0070] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0071] The term "plurality" used in the present application refers to two or more (including two).

[0072] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0073] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A 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 current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0075] The production process of positive or negative pole pieces in battery cells usually includes slurry preparation, coating and drying. After the slurry is prepared and before coating, it usually needs to go through the steps of filtering large particles and removing metal impurities. A filter device is required to filter large particles, and a magnetic filter is required to remove metal impurities. Among them, filtering large particles is to improve particle consistency and reduce clogging of the coating die. Magnetic substances such as metal particles will cause battery performance to deteriorate, so they need to be removed.

[0076] In the related art, the filter device and the magnetic filter are usually separately arranged and connected by a pipeline. The slurry passes through the filter device and the magnetic filter in turn to remove impurities. This process takes a long time, resulting in a low overall filtration efficiency of the slurry.

[0077] In view of this, the present application provides a slurry filtering device, which sets the filter screen and the magnetic adsorption part in the same device, so that the slurry completes the two steps of filtering large particle impurities and metal impurities after passing through the device, saving time, improving the slurry filtering efficiency, and thus improving the production efficiency of battery cells.

[0078] The slurry filtration device described in the embodiment of the present application is suitable for a battery production system.

[0079] Figure 1 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0080] like Figure 1 As shown, the battery production system 100 includes a slurry making device 300, a slurry filtering device 200, a coating device 400 and a drying device 500. The slurry making device 300 is used to mix active materials, adhesives and conductive agents to prepare slurry. The slurry filtering device 200 is used to filter impurities in the slurry. The coating device 400 is used to apply the slurry to at least one side of the current collector. The drying device 500 is used to dry the current collector coated with the slurry to form a dry electrode sheet.

[0081] Exemplarily, the battery production system 100 further includes a winding device or a stacking device. The winding device is used to wind the positive electrode sheet, the separator and the negative electrode sheet to form an electrode assembly. The stacking device is used to stack the positive electrode sheet, the separator and the negative electrode sheet to form an electrode assembly.

[0082] Exemplarily, the battery production system 100 further includes a packaging device, which is located downstream of the winding device or the lamination device, and is used to load the electrode assembly into the shell. Exemplarily, the packaging device includes a holding mechanism for holding the shell and a manipulator for grabbing the electrode assembly. The holding mechanism can be two pressure plates with adjustable distances, which are pressed against both sides of the shell; or it can also be a manipulator. Exemplarily, the packaging device is also used to cover the end cap on the shell.

[0083] Figure 2 A schematic diagram of the structure of a slurry filtration device provided in some embodiments of the present application. Figure 3 A schematic diagram of the structure of a slurry filtering device provided in some embodiments of the present application at another angle; Figure 4 for Figure 3 Partial cross-sectional view at AA.

[0084] like Figure 2-Figure 4 As shown, the present application also provides a slurry filtering device 200, including a filter body 1, a filter screen 2 and a magnet adsorbent 3. The filter body 1 has a filter chamber 11, a mounting chamber 12, a slurry inlet 13 and a slurry outlet 14. The filter chamber 11 and the mounting chamber 12 are arranged at intervals and connected through a channel 16. The slurry inlet 13 is connected to the filter chamber 11 and is used to transport slurry to the filter chamber 11. The slurry outlet 14 is connected to the mounting chamber 12 and is used to export the slurry. The filter screen 2 is located in the filter chamber 11 and divides at least part of the filter chamber 11 into a first cavity 111 and a second cavity 112. The first cavity 111 is connected to the slurry inlet 13 and is used to accommodate unfiltered slurry. The second cavity 112 is connected to the channel 16 and is used to accommodate filtered slurry. The magnet adsorbent 3 is arranged in the mounting chamber 12 and is used to adsorb metal impurities in the slurry.

[0085] The filter cavity 11 and the installation cavity 12 of the embodiment of the present application are arranged at an interval, that is, there is a wall separating the filter cavity 11 and the installation cavity 12 so that the two form two independent cavities and are connected through another channel 16.

[0086] The channel 16 in the embodiment of the present application may be formed by a pipeline, or may be formed by a cavity or a through hole.

[0087] The slurry inlet 13 of the embodiment of the present application may be an opening or a through hole, or may be formed by a pipeline. Similarly, the slurry outlet 14 of the embodiment of the present application may be an opening or a through hole, or may be formed by a pipeline.

[0088] The filter screen 2 of the embodiment of the present application divides at least part of the filter cavity 11 into a first cavity 111 and a second cavity 112, that is, the slurry passes through the filter screen 2 from the first cavity 111 into the second cavity 112, and changes from an unfiltered state to a filtered state. The filter screen 2 of the embodiment of the present application can be laid in the filter cavity 11 in a flat plate shape. Specifically, Figure 4 In the orientation shown, the filter screen 2 is laid horizontally, dividing the filter cavity 11 into a first cavity 111 and a second cavity 112 arranged vertically, the upper first cavity 111 is connected to the slurry inlet 13 , and the lower second cavity 112 is connected to the channel 16 .

[0089] The magnetic adsorption member 3 of the embodiment of the present application is arranged in the installation cavity 12, which is in contact with the slurry. The magnetic adsorption member 3 of the embodiment of the present application can be an electromagnet or a permanent magnet. The magnetic adsorption member 3 arranged in one installation cavity 12 can be one or more.

[0090] The slurry filtering device 200 of the embodiment of the present application has a filtering chamber 11 and an installation chamber 12, in which a filter screen 2 and a magnetic adsorbent 3 are placed respectively. In this way, large particles and metal particles can be filtered out after the slurry passes through the filtering chamber 11 and the installation chamber 12. Therefore, the slurry filtering device 200 can perform two filtering steps at the same time, shortening the walking path of the slurry, improving the filtering efficiency of the slurry, and thus improving the production efficiency of the battery cells.

[0091] In some embodiments, there are multiple installation cavities 12 , which are arranged at intervals on the outer peripheral side of the filter cavity 11 and are all connected to the slurry outlet 14 , and each installation cavity 12 is provided with a magnetic adsorption component 3 .

[0092] The number of the installation cavities 12 in the embodiment of the present application can be two, three, four, five or six. The multiple installation cavities 12 can be arranged around the filter cavity 11 at equal intervals or at unequal intervals.

[0093] The multiple installation cavities 12 of the embodiment of the present application are all connected to the slurry outlet 14. The multiple installation cavities 12 can be connected to the slurry outlet 14 through different through holes, or through different pipelines.

[0094] The installation cavity 12 of the embodiment of the present application can be directly connected to the second cavity 112 through the through hole on the side wall.

[0095] The installation cavity 12 is arranged in plurality, and the plurality of installation cavities 12 are arranged around the outer peripheral side of the filter cavity 11. In this way, not only can the ability of the slurry filtering device 200 to filter metal particles be improved, but also this arrangement method can make full use of the space and reduce the size of the slurry filtering device 200 from its top to the bottom.

[0096] In some embodiments, the filter body 1 includes a bottom wall 15 facing the filter cavity 11, the bottom wall 15 faces the second cavity 112, and a first through hole 161 is provided on the portion of the bottom wall 15 facing the second cavity 112. The filter body 1 also has a first communication cavity 162, the first communication cavity 162 is located on the side of the bottom wall 15 away from the filter cavity 11, the first communication cavity 162 is connected to the second cavity 112 through the first through hole 161, the first communication cavity 162 is connected to the plurality of mounting cavities 12, and the first communication cavity 162 and the first through hole 161 form a channel 16.

[0097] The first through hole 161 of the embodiment of the present application penetrates the bottom wall 15 along the thickness direction of the bottom wall 15 , and the first through hole 161 is connected to the second cavity 112 .

[0098] The first connecting cavity 162 of the embodiment of the present application is located below the filter cavity 11 .

[0099] Optionally, there are multiple first through holes 161 , and the multiple first through holes 161 are arranged at intervals.

[0100] The first connecting cavity 162 is provided to connect the plurality of installation cavities 12 , which can simplify the connecting paths between the plurality of installation cavities 12 and the filter cavity 11 , and is more convenient to manufacture.

[0101] In some embodiments, the installation cavity 12 and the first communication cavity 162 are arranged in a direction from the top to the bottom of the filter body 1 .

[0102] like Figure 4 In the middle position, the installation cavity 12 and the first connecting cavity 162 of the embodiment of the present application are arranged up and down.

[0103] Such an arrangement can reduce the volume of the slurry remaining in the installation cavity 12 that cannot be filtered, thereby improving the filtering effect of the slurry.

[0104] Optionally, a projection of the installation cavity 12 along the arrangement direction from the top to the bottom of the filter body 1 on the first connecting cavity 162 is located inside the first connecting cavity 162 .

[0105] Please continue to refer to Figure 4 In some embodiments, the filter body 1 further has a second connecting cavity 17 , which is spaced apart from the filter cavity 11 and connects with the plurality of mounting cavities 12 , and the plurality of mounting cavities 12 are connected to the slurry outlet 14 through the second connecting cavity 17 .

[0106] In the embodiment of the present application, the second connecting cavity 17 is spaced apart from the filter cavity 11 , that is, there is a wall separating the filter cavity 11 and the second connecting cavity 17 , thereby forming two independent cavities.

[0107] The second communicating cavity 17 of the embodiment of the present application is connected to the slurry outlet 14 . The second communicating cavity 17 may be located obliquely above the filter cavity 11 , or may be disposed around the filter cavity 11 .

[0108] The second connecting cavity 17 is provided to connect the plurality of installation cavities 12 , which can simplify the connecting paths between the plurality of installation cavities 12 and the slurry outlet 14 , and is convenient to set up.

[0109] In some embodiments, the second communication cavity 17 surrounds at least a portion of the outer circumference of the filter cavity 11 .

[0110] Such an arrangement can reduce the size of the filter body 1 from the top to the bottom, thereby improving the space utilization of the slurry filtering device 200 in this direction.

[0111] Optionally, the second communication cavity 17 surrounds the entire outer circumference of the filter cavity 11 .

[0112] In some embodiments, the second communication cavity 17 and the slurry outlet 14 are both formed at the top of the filter body 1 .

[0113] The slurry outlet 14 in the embodiment of the present application may be located on the top surface of the filter body 1 , or may be located on the side surface of the top of the filter body 1 .

[0114] The top of the embodiment of the present application can be considered as the portion above the middle of the filter body 1 in the height direction, and the bottom can be considered as the portion below the middle of the filter body 1 in the height direction. Optionally, the channel 16 is formed at the bottom of the filter body 1 .

[0115] Such an arrangement can increase the path for the slurry to move from bottom to top in the installation cavity 12, thereby improving the filtering effect.

[0116] Figure 5 A schematic diagram of the structure of a slurry filtering device provided in some embodiments of the present application at another angle; Figure 6 for Figure 5Partial cross-sectional view at CC.

[0117] See also Figure 4 , Figure 5 and Figure 6 In some embodiments, the slurry filtering device 200 also includes a first pipeline 18, the first pipeline 18 has two ends opposite to each other in the extension direction, one end of the first pipeline 18 is connected to the first cavity 111, and the other end forms a slurry inlet 13, the second connecting cavity 17 surrounds the outer peripheral side of the filter cavity 11, and the first pipeline 18 passes through the second connecting cavity 17 and is connected to the first cavity 111.

[0118] The second connecting cavity 17 of the embodiment of the present application is arranged in a surrounding manner, that is, extends in a ring shape.

[0119] In the embodiment of the present application, the end of the first pipeline 18 connected to the first cavity 111 may extend into the first cavity 111 , or may be merely disposed on the wall of the first cavity 111 without extending into the first cavity 111 .

[0120] The first pipeline 18 in the embodiment of the present application can be in a straight pipe shape or in a curved pipe shape.

[0121] Optionally, the first pipeline 18 is in the shape of a straight pipe and is arranged horizontally.

[0122] The first pipeline 18 is arranged to pass through the second communicating cavity 17 and communicate with the first cavity 111 , which can facilitate communication with the first cavity 111 and connection with an external pipeline under the premise of setting the second communicating cavity 17 .

[0123] In some embodiments, the slurry filtering device 200 further includes a second pipeline having two ends opposite to each other in the extension direction, one end of the second pipeline is connected to the second connecting cavity 17 , and the other end forms a slurry outlet 14 .

[0124] In some embodiments, the magnetic adsorption member 3 is a magnetic bar.

[0125] Optionally, each mounting cavity 12 is provided with only one magnetic bar.

[0126] The magnetic adsorption member 3 is set as a magnetic bar, which is a permanent magnet, so it does not need to be powered, is easy to use, and has high reliability.

[0127] In some embodiments, the slurry outlet 14 is formed at the top of the filter body 1 , and the magnetic bar extends from the top to the bottom of the filter body 1 and has a distance from the side wall of the installation cavity 12 to allow the slurry to flow from the bottom to the top of the magnetic bar.

[0128] The top of the filter body 1 in the embodiment of the present application can be considered as the portion above the middle of the filter body 1 in the height direction.

[0129] The magnetic bar of the embodiment of the present application extends from the top to the bottom of the filter body 1, that is, the length direction of the magnetic bar is the direction from the top to the bottom of the filter body 1. The top of the magnetic bar can be considered as the part above the middle of the magnetic bar in the height direction, and the bottom of the magnetic bar can be considered as the part below the middle of the magnetic bar in the height direction.

[0130] The slurry inlet 13 of the embodiment of the present application may be formed on the top surface of the top or the side surface of the top.

[0131] Optionally, the entire circumference of the magnetic bar is spaced apart from the side wall of the mounting cavity 12 .

[0132] The magnetic rod is arranged to extend from the top to the bottom of the filter body 1 , so that the contact path with the slurry can be increased, the magnetic rod can fully contact the slurry, and the filtering effect on the metal particles in the slurry can be improved.

[0133] Figure 7 for Figure 4 Enlarged view of point B in the middle.

[0134] See also Figure 4 and Figure 7 In some embodiments, the filter body 1 further includes a plurality of convex cylinder structures 19 , which are spaced apart on the top surface of the filter body 1 and connected one by one with the plurality of mounting cavities 12 , and the top end of the magnetic rod protrudes and overlaps the top surface of the convex cylinder structure 19 .

[0135] The convex cylinder structure 19 of the embodiment of the present application can be integrally formed with the top surface of the filter body 1, or can be connected by welding or other methods.

[0136] Each installation cavity 12 in the embodiment of the present application is connected to a corresponding convex cylinder structure 19 .

[0137] The top end of the magnetic rod in the embodiment of the present application protrudes and overlaps the top surface of the convex cylinder structure 19, that is, the top end of the magnetic rod protrudes from the top surface of the convex cylinder structure 19 along the direction from the bottom to the top of the filter body 1, and extends radially to overlap the top surface of the convex cylinder structure 19, and the convex cylinder structure 19 plays a bearing role.

[0138] The inner surface of the convex cylinder structure 19 of the embodiment of the present application can be spaced apart from the magnetic rod, or can be in close contact with the magnetic rod.

[0139] The convex cylinder structure 19 and the magnetic rod in the embodiment of the present application may adopt other structures to connect the two. For example, a pressing mechanism may be used to press the top surface of the magnetic rod so that the magnetic rod is abutted against the convex cylinder structure 19 to reduce the movement of the magnetic rod and the overflow of slurry.

[0140] With such arrangement, the convex cylinder structure 19 supports the magnetic rod and prevents the magnetic rod from falling. At the same time, the magnetic rod can be easily taken out when it is needed to be cleaned, that is, the magnetic rod can be taken out upwards.

[0141] Optionally, a handle is provided on the top surface of the magnetic rod to facilitate removal.

[0142] In some embodiments, at least a portion of the inner surface of the convex cylinder structure 19 is in contact with the magnetic rod.

[0143] Optionally, the inner surface of the convex cylinder structure 19 is in contact with the magnetic rod in the circumferential direction.

[0144] With such arrangement, the magnetic rod is directly attached to the convex cylinder structure 19, which can reduce the slurry from flowing toward the top opening of the convex cylinder structure 19, thereby reducing the possibility of slurry overflowing.

[0145] In some embodiments, the slurry filtering device 200 further includes a connector 4 , which is connected to the top of the magnetic rod and the top of the convex cylinder structure 19 , and fixes the magnetic rod to the convex cylinder structure 19 .

[0146] The connecting member 4 of the embodiment of the present application may be a sealing tape, which is attached to the circumference of the magnetic rod and the convex cylinder structure 19 to seal the two.

[0147] Optionally, the top of the convex cylinder structure 19 has a first flange structure, and the top of the magnetic rod has a second flange structure, the first flange structure and the second flange structure are both annular and abut against each other, and the second flange structure is located above the first flange structure. Further, the connector 4 is an annular clamp, which is clamped to the first flange structure and the second flange structure. In another exemplary embodiment, the connector 4 is a steel clip, which is clamped to the first flange structure and the second flange structure.

[0148] The connection piece 4 is provided to improve the tightness and sealing of the connection between the magnetic rod and the convex cylinder structure 19, reduce the possibility of the magnetic rod moving under the action of the slurry and pressure, and reduce the overflow of the slurry.

[0149] Figure 8 for Figure 6 Enlarged view of point D in the middle.

[0150] See also Figure 6 and Figure 8 In some embodiments, the filter screen 2 includes a connected barrel body 21 and an annular protrusion 22. The barrel body 21 is used to filter the slurry and has a first opening and a second opening arranged in a direction from the top to the bottom of the filter body 1. The first opening is connected to the slurry inlet 13. The annular protrusion 22 surrounds the first opening and is connected to the side wall of the filter cavity 11. The inner cavity of the barrel body 21 forms a first cavity 111, and the space enclosed by the barrel body 21, the annular protrusion 22, the side wall of the filter cavity 11 and the bottom wall 15 of the filter cavity 11 forms a second cavity 112.

[0151] The annular protrusion 22 and the barrel body 21 of the embodiment of the present application can be connected by integral molding or by welding or other methods.

[0152] The annular protrusion 22 of the embodiment of the present application can be connected to the side wall of the installation cavity 12 by means of a snap connection, that is, the side wall of the installation cavity 12 is provided with an annular groove, and part of the annular protrusion 101 is accommodated in the annular groove.

[0153] The barrel body 21 of the embodiment of the present application may be formed by connecting multiple layers of filter screens.

[0154] The filter screen 2 is configured as a cylindrical structure, which has a larger filtering area, thereby improving the ability of the slurry filtering device 200 to filter large particles.

[0155] In some embodiments, the filter body 1 further includes an annular protrusion 101 , which is disposed on the side wall of the filter cavity 11 , and the annular protrusion 22 overlaps the annular protrusion 101 and is connected to the annular protrusion 101 .

[0156] The annular protrusion 101 and the annular protrusion 22 of the embodiment of the present application can be connected by bolt connection or plug-in connection. For example, a plurality of spaced plugs are provided on the upper surface of the annular protrusion 101, and the annular protrusion 22 is provided with a socket adapted to the plugs, and the plugs are plugged and matched with the sockets, so as to realize the connection between the annular protrusion 22 and the annular protrusion 101.

[0157] The annular protrusion 101 can provide a better bearing and fixing effect on the filter screen 2 and facilitate the connection between the filter screen 2 and the filter body 1 .

[0158] In some embodiments, a first through hole 161 is provided on the bottom wall 15 of the filter cavity 11 facing the second cavity 112 . The first through hole 161 forms a partial channel 16 . There are multiple first through holes 161 , which are spaced apart along the outer circumference of the barrel body 21 .

[0159] Another part of the channel 16 of the embodiment of the present application can be formed by a pipeline or a cavity. Exemplarily, the channel 16 also includes a plurality of connecting pipes, one end of each connecting pipe is connected to at least one first through hole 161, and the other end is connected to an installation cavity 12.

[0160] The plurality of first through holes 161 can allow more slurry to flow out of the second cavity 112 , thereby improving the filtering efficiency of the slurry filtering device 200 .

[0161] Please continue reading Figure 5 and Figure 6In some embodiments, the slurry filtering device 200 also includes a scraping mechanism 5, which includes a rotating shaft 51 and a scraper 52. The rotating shaft 51 extends from the inside of the cylinder body 21 to the outside of the filter body 1. The scraper 52 is connected to the rotating shaft 51 and sweeps the slurry attached to the inner surface of the cylinder body 21 driven by the rotating shaft 51.

[0162] The scraper 52 of the embodiment of the present application can be a plate-shaped member or a rod-shaped member. Optionally, the size of the scraper 52 along the direction from the top to the bottom of the filter body 1 is greater than or equal to the size of the cartridge body 21 along the direction from the top to the bottom of the filter body 1.

[0163] The rotating shaft 51 in the embodiment of the present application can be driven manually or by a motor.

[0164] The scraper 52 and the rotating shaft 51 of the embodiment of the present application can be directly connected or connected through components such as a connecting rod.

[0165] Optionally, the rotating shaft 51 and the filter body 1 are connected by a bearing. Of course, the filter body 1 may also be provided with only an escape hole for escaping the rotating shaft 51 .

[0166] The scraping mechanism 5 is provided to sweep away the large particles and slurry attached to the inner surface of the scraper body 21, thereby improving the situation where the filtering efficiency of the filter screen 2 decreases due to clogging.

[0167] In some embodiments, the slurry filtering device 200 further includes a driving member 53 located outside the filtering body 1 , and the driving member 53 is connected to the end of the rotating shaft 51 and is used to drive the rotating shaft 51 to rotate.

[0168] The driving member 53 of the embodiment of the present application may be located above the filter body 1 or below the filter body 1. Optionally, the driving member 53 is fixedly connected to the top surface of the filter body 1.

[0169] The driving member 53 in the embodiment of the present application may be a motor or other components that can drive the rotating shaft 51 to rotate.

[0170] The drive member 53 is provided to improve the scraping efficiency of the scraping mechanism 5 and further improve the situation where the filtering efficiency is reduced due to the clogging of the filter screen 2.

[0171] Please continue reading Figure 4 In some embodiments, the bottom wall 15 of the filter cavity 11 is provided with a second through hole 151, which is connected to the second opening and is used to discharge impurities.

[0172] The second through hole 151 of the embodiment of the present application is in communication with the first cavity 111. Optionally, there are multiple second through holes 151.

[0173] The second through hole 151 is provided to facilitate the discharge of large particles in the slurry that are intercepted by the filter screen 2 .

[0174] In some embodiments, the filter body 1 also includes a sewage outlet 102 and a sewage holding chamber 103. The sewage holding chamber 103 is located on the side of the bottom wall 15 of the filter chamber 11 away from the filter chamber 11 and is connected to the second through hole 151. The sewage outlet 102 is connected to the sewage holding chamber 103 and is located on the side of the sewage holding chamber 103 away from the filter chamber 11.

[0175] The part of the filter body 1 forming the dirt holding cavity 103 of the embodiment of the present application may be an inverted cone structure, and the drain port 102 is located at the tip of the cone structure. The part of the filter body 1 forming the dirt holding cavity 103 may also be other shapes, such as a cuboid.

[0176] Optionally, a cover is further provided at the sewage outlet 102 , and the cover is used to close the sewage outlet 102 .

[0177] The dirt holding chamber 103 and the drain outlet 102 are provided to facilitate temporary storage of large particles of impurities when the drain outlet 102 is closed. In addition, the drain outlet 102 is provided on the side of the dirt holding chamber 103 away from the filter chamber 11, which facilitates draining of dirt under the action of gravity.

[0178] In some embodiments, the slurry filtering device 200 further includes a frame 6 , the filtering body 1 is disposed on the frame 6 , and a plurality of rollers 61 are disposed at the bottom end of the frame 6 .

[0179] The roller 61 in the embodiment of the present application may be a one-way wheel or a universal wheel.

[0180] Such an arrangement can facilitate the movement of the slurry filtering device 200.

[0181] The embodiment of the present application further provides a battery production system 100 , including the above-mentioned slurry filtering device 200 .

[0182] See also Figure 2-Figure 8The embodiment of the present application provides a slurry filtering device 200, including a filter body 1, a filter screen 2 and a magnetic adsorbent 3. The filter body 1 has a filter chamber 11, a mounting chamber 12, a slurry inlet 13 and a slurry outlet 14. The filter chamber 11 and the mounting chamber 12 are arranged at intervals and connected through a channel 16. The slurry inlet 13 is connected to the filter chamber 11 and is used to transport slurry to the filter chamber 11. The slurry outlet 14 is connected to the mounting chamber 12 and is used to export the slurry. The filter screen 2 is located in the filter chamber 11 and divides at least part of the filter chamber 11 into a first cavity 111 and a second cavity 112. The first cavity 111 is connected to the slurry inlet 13 and is used to accommodate unfiltered slurry. The second cavity 112 is connected to the channel 16 and is used to accommodate filtered slurry. The magnetic adsorbent 3 is arranged in the mounting chamber 12 and is used to adsorb metal impurities in the slurry. There are multiple installation cavities 12, which are arranged at intervals on the outer peripheral side of the filter cavity 11 and are all connected to the slurry outlet 14. Each installation cavity 12 is provided with a magnetic adsorption member 3. The filter body 1 includes a bottom wall 15 facing the filter cavity 11, the bottom wall 15 faces the second cavity 112, and the portion of the bottom wall 15 facing the second cavity 112 is provided with a first through hole 161. The filter body 1 also has a first communicating cavity 162, which is located on the side of the bottom wall 15 away from the filter cavity 11, and the first communicating cavity 162 is connected to the second cavity 112 through the first through hole 161, and the first communicating cavity 162 is connected to the multiple installation cavities 12, and the first communicating cavity 162 and the first through hole 161 form a channel 16. The installation cavity 12 and the first communicating cavity 162 are arranged in a direction from the top to the bottom of the filter body 1. The filter body 1 also has a second connecting cavity 17, which is spaced apart from the filter cavity 11 and connected to a plurality of mounting cavities 12, and the plurality of mounting cavities 12 are connected to the slurry outlet 14 through the second connecting cavity 17. The second connecting cavity 17 surrounds at least part of the outer peripheral side of the filter cavity 11. The second connecting cavity 17 and the slurry outlet 14 are both formed at the top of the filter body 1. The magnetic adsorption member 3 is a magnetic rod. The magnetic rod extends from the top to the bottom of the filter body 1, and has a spacing with the side wall of the mounting cavity 12, so that the slurry flows from the bottom of the magnetic rod to the top.

[0183] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A slurry filtering device, characterized in that: include: A filter body, comprising a filter cavity, a mounting cavity, a slurry inlet and a slurry outlet, wherein the filter cavity and the mounting cavity are spaced apart and connected through a channel, the slurry inlet is connected to the filter cavity and used to transport slurry to the filter cavity, and the slurry outlet is connected to the mounting cavity and used to export the slurry; a filter screen, located in the filter cavity, and dividing at least a portion of the filter cavity into a first cavity and a second cavity, wherein the first cavity is communicated with the slurry inlet and is used to accommodate the unfiltered slurry, and the second cavity is communicated with the channel and is used to accommodate the filtered slurry; The magnetic adsorption component is arranged in the installation cavity and is used for adsorbing metal impurities in the slurry.

2. The slurry filtering device according to claim 1, characterized in that: There are multiple installation cavities, which are arranged at intervals on the outer peripheral side of the filter cavity and are all connected to the slurry outlet. Each installation cavity is provided with the magnetic adsorption component.

3. The slurry filtering device according to claim 2, characterized in that: The filter body comprises a bottom wall facing the filter cavity, the bottom wall faces the second cavity, and a portion of the bottom wall facing the second cavity is provided with a first through hole, The filter body also has a first connecting cavity, which is located on the side of the bottom wall away from the filter cavity. The first connecting cavity and the second cavity are connected through the first through hole. The first connecting cavity is connected to the plurality of mounting cavities, and the first connecting cavity and the first through hole form the channel.

4. The slurry filtering device according to claim 3, characterized in that: The installation cavity and the first communication cavity are arranged in a direction from the top to the bottom of the filter body.

5. The slurry filtering device according to claim 2, characterized in that: The filter body further comprises a second communicating cavity, which is spaced apart from the installation cavity and communicates with a plurality of the installation cavities, and the plurality of the installation cavities are communicated with the slurry outlet through the second communicating cavity.

6. The slurry filtering device according to claim 5, characterized in that: The second communication cavity surrounds at least a portion of the outer circumference of the filter cavity.

7. The slurry filtering device according to claim 5, characterized in that: The second communicating cavity and the slurry outlet are both formed at the top of the filter body.

8. The slurry filtering device according to claim 6, characterized in that: The filter body further includes a first pipeline, wherein the first pipeline has two ends opposite to each other in the extension direction, one end of the first pipeline is connected to the first cavity, and the other end forms the slurry inlet. The second communication cavity surrounds the outer peripheral side of the filter cavity, and the first pipeline passes through the second communication cavity and is communicated with the first cavity.

9. The slurry filtering device according to claim 1, characterized in that: The magnetic adsorption component is a magnetic bar.

10. The slurry filtering device according to claim 9, characterized in that: The slurry outlet is formed at the top of the filter body, and the magnetic bar extends from the top to the bottom of the filter body and has a spacing from the side wall of the installation cavity so that the slurry flows from the bottom to the top of the magnetic bar.

11. The slurry filtering device according to claim 10, characterized in that: The filter body further comprises a plurality of convex cylinder structures, which are arranged at intervals on the top surface of the filter body and are connected one by one with the plurality of mounting cavities. The top end of the magnetic rod protrudes and overlaps the top surface of the convex cylinder structure.

12. The slurry filtering device according to claim 11, characterized in that: At least a portion of the inner surface of the convex cylinder structure is in contact with the magnetic rod.

13. The slurry filtering device according to claim 11, characterized in that: The slurry filtering device also includes a connecting piece, which is connected to the top of the magnetic rod and the top of the convex cylinder structure, and fixes the magnetic rod to the convex cylinder structure.

14. The slurry filtering device according to any one of claims 1 to 13, characterized in that: The filter screen comprises a connected barrel body and an annular convex portion, wherein the barrel body is used to filter the slurry and has a first opening and a second opening arranged in a direction from the top to the bottom of the filter body, wherein the first opening is communicated with the slurry inlet, and the annular convex portion surrounds the first opening and is connected to the side wall of the filter cavity. The inner cavity of the barrel body forms the first cavity, and the space enclosed by the barrel body, the annular protrusion, the side wall of the filter cavity and the bottom wall of the filter cavity forms the second cavity.

15. The slurry filtering device according to claim 14, characterized in that: The filter body further comprises an annular protrusion, which is arranged on the side wall of the filter cavity, and the annular convex portion overlaps the annular protrusion and is connected to the annular protrusion.

16. The slurry filtering device according to claim 14, characterized in that: A first through hole is provided on a portion of the bottom wall of the filter cavity facing the second cavity, and the first through hole forms part of the channel. There are multiple first through holes, and the multiple first through holes are spaced apart along the outer circumference of the barrel body.

17. The slurry filtering device according to claim 14, characterized in that: The slurry filtering device also includes a scraping mechanism, which includes a rotating shaft and a scraper. The rotating shaft extends from the barrel body to the outside of the filter body. The scraper is connected to the rotating shaft and, driven by the rotating shaft, scrapes the slurry attached to the inner surface of the barrel body.

18. The slurry filtering device according to claim 17, characterized in that: The slurry filtering device further comprises a driving member located outside the filtering body, wherein the driving member is connected to the end of the rotating shaft and is used for driving the rotating shaft to rotate.

19. The slurry filtering device according to claim 14, characterized in that: The bottom wall of the filter cavity is provided with a second through hole, the second through hole is communicated with the second opening and is used for discharging impurities.

20. The slurry filtering device according to claim 19, characterized in that: The filter body also includes a sewage outlet and a sewage holding chamber, wherein the sewage holding chamber is located on a side of the bottom wall of the filter chamber away from the filter chamber and is connected to the second through hole, and the sewage outlet is connected to the sewage holding chamber and is located on a side of the sewage holding chamber away from the filter chamber.

21. The slurry filtering device according to claim 1, characterized in that: The slurry filtering device further comprises a frame, the filtering body is arranged on the frame, and a plurality of rollers are arranged at the bottom end of the frame.

22. A battery production system, characterized in that: Comprising a slurry filtering device as described in any one of claims 1-21.

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