Battery slurry foreign matter processing apparatus and method

Abstract

The application relates to a battery slurry foreign matter treatment device and method. The battery slurry foreign matter treatment device comprises a shell, a filter, a demagnetizer and a cleaning piece. The shell is provided with a containing cavity, an inlet and an outlet, and the inlet and the outlet are both communicated with the containing cavity. The filter is provided with filter holes, and is arranged in the containing cavity. The filter separates the containing cavity into a first separation channel and a second separation channel. The inlet is communicated with the first separation channel, the outlet is communicated with the second separation channel, and the first separation channel and the second separation channel are communicated through the filter holes. The demagnetizer is arranged in the first separation channel. The cleaning piece is movably arranged in the first separation channel, and is used for cleaning the surface material of the demagnetizer. The battery slurry foreign matter treatment device and method have the advantages of high production efficiency and saved production cost.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery slurry foreign matter treatment device and method. Background Technology

[0002] In the production and manufacturing process of battery materials, the control of foreign matter in battery slurry is a core aspect that determines battery safety, consistency, and cycle life. Magnetic impurities in battery slurry can cause micro-short circuits inside the cell, leading to self-discharge or even thermal runaway, while non-magnetic impurities may cause problems such as electrode coating defects and separator punctures, directly affecting the battery's yield and long-term reliability.

[0003] Currently, battery mass production lines generally employ a two-stage, series-connected foreign matter control process. The first stage is a magnetic rod box, used to adsorb and remove magnetic impurities from the slurry. The second stage is a vibrating screen or bag filter, used to intercept non-magnetic impurities and agglomerates in the battery slurry. However, in high-viscosity battery slurries, the demagnetization efficiency of the magnetic rods is low, and the rods are easily saturated, requiring frequent shutdowns for cleaning, which affects production efficiency. Moreover, the two stages are arranged independently, the process is cumbersome, and slurry transfer relies on pipelines. Battery slurry residue easily remains on the inner walls and bends of the pipelines, resulting in material waste. Summary of the Invention

[0004] Therefore, it is necessary to provide a device and method for treating foreign matter in battery slurry to address the problems of low production efficiency and high production costs.

[0005] This invention provides a battery slurry foreign matter treatment device, comprising: The housing has a receiving cavity, an inlet and an outlet, and the inlet and outlet are both connected to the receiving cavity; A filter element, wherein the filter element is provided with filter holes, the filter element is disposed in the receiving cavity, the filter element divides the receiving cavity into a first separation channel and a second separation channel, the inlet is connected to the first separation channel and the outlet is connected to the second separation channel, and the first separation channel and the second separation channel are connected through the filter holes; A demagnetizing component is disposed within the first separation channel; A cleaning component is movably disposed within the first separation channel, and the cleaning component is used to clean magnetic impurities on the surface of the demagnetizing component.

[0006] In one embodiment, the filter element is configured as a cylindrical structure, the demagnetizing element is configured as a rod-shaped structure, the demagnetizing element and the filter element are coaxially disposed in the receiving cavity, the inner sidewall of the filter element forms the first separation channel, and the outer sidewall of the filter element and the inner wall of the housing form the second separation channel.

[0007] In one embodiment, the battery slurry foreign matter treatment device further includes a drive mechanism mounted on the housing, the filter element rotatably disposed in the receiving cavity, the drive mechanism being connected to the filter element and used to drive the filter element to rotate within the receiving cavity, the cleaning element being connected to the inner sidewall of the filter element, and the drive mechanism being used to drive the cleaning element and the filter element to rotate around the demagnetizing element.

[0008] In one embodiment, the housing is further provided with a slag discharge port, which is connected to the first separation channel, and the feed port is connected to the end of the first separation channel away from the slag discharge port.

[0009] In one embodiment, the cleaning element includes a cleaning blade connected to the inner wall of the filter element, and the driving mechanism drives the filter element and the cleaning blade to rotate around the demagnetizing element.

[0010] In one embodiment, the cleaning blade is configured as a helical blade, and the helical direction of the helical blade is configured to propel the surface material of the demagnetizing element toward the slag discharge port when rotating in the forward direction.

[0011] In one embodiment, the pitch of the helical blade is set to 0.7 to 0.9 times the diameter of the filter element, and the helix angle of the helical blade is set to 12° to 18°.

[0012] In one embodiment, the battery slurry foreign matter treatment device further includes a mounting bracket connected to the housing, the cleaning component being detachably mounted on the mounting bracket, the housing having a mounting hole through which the cleaning component is inserted into the first separation channel.

[0013] In one embodiment, the radial clearance D of the first separation channel is set to 5 mm to 25 mm.

[0014] The present invention also provides a method for treating foreign matter in battery slurry, applicable to the battery slurry foreign matter treatment device described above, comprising the following steps: The battery slurry to be processed is fed into the first separation channel from the feed inlet; The battery slurry flows through the filter element into the second separation channel to filter out non-magnetic agglomerates of the battery slurry; The demagnetizing component adsorbs magnetic impurities from the battery slurry flowing through it; The cleaning component continuously cleans the magnetic impurities adsorbed on the surface of the demagnetizing component in order to maintain the adsorption capacity of the demagnetizing component. The battery slurry filtered in the second separation channel is discharged from the outlet.

[0015] The aforementioned battery slurry foreign matter treatment device and method provide a sealed space for battery slurry processing within the housing cavity. The battery slurry enters the first separation channel through the inlet and flows through the demagnetizing component, where magnetic impurities are adsorbed and captured. Subsequently, under pressure, the battery slurry passes through a filter and enters the second separation channel, where the filter removes non-magnetic impurities and agglomerates. Finally, the filtered battery slurry is output through the outlet. A cleaning component is movably arranged on the outer wall of the demagnetizing component and continuously moves relative to it during battery slurry processing, constantly cleaning the adsorption surface of the demagnetizing component. This removes accumulated magnetic impurities from the surface of the demagnetizing component and renews the magnetic adsorption interface, preventing excessive accumulation of magnetic impurities on the surface of the demagnetizing component and the formation of a magnetic field shield. This ensures long-term stable demagnetization efficiency, eliminates the need for frequent shutdowns to disassemble and clean the magnetic rods, and improves the continuous operation capability and production efficiency of the production line. Furthermore, the demagnetizing component and the filtering component are integrated into the same housing cavity, eliminating the need for connecting pipelines and buffer tanks between traditional two-stage series processes. This significantly reduces dead zones and residues in the battery slurry transportation process, thereby significantly reducing material loss and production costs. Attached Figure Description

[0016] Figure 1 , Figure 2 and Figure 3 This is a schematic diagram of the battery slurry foreign matter treatment device described in an embodiment of this application.

[0017] Figure 4 This is a comparison chart of the production efficiency of the battery slurry foreign matter treatment device described in this application embodiment and the prior art.

[0018] Icon labels: 100. Shell; 110. Receiving cavity; 111. First separation channel; 112. Second separation channel; 120. Feed inlet; 130. Discharge outlet; 140. Slag discharge outlet; 150. Mounting hole; 160. Mounting bracket; 200. Filter element; 300. Demagnetizing element; 400. Cleaning element; 410. Spiral blade; 500. Drive mechanism. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0025] See Figures 1 to 3 This diagram illustrates a structural schematic of a battery slurry foreign matter treatment device according to an embodiment of this application. The device includes a housing 100, a filter element 200, a demagnetizing element 300, and a cleaning element 400. The housing 100 has a receiving cavity 110, an inlet 120, and an outlet 130, both of which are connected to the receiving cavity 110. The housing 100 adopts a completely sealed structure design, effectively preventing the volatilization of organic solvents in the battery slurry and the intrusion of external dust particles, thus meeting the cleanliness requirements and explosion-proof safety standards of battery production workshops. Specifically, the housing 100 is made of 304 stainless steel.

[0026] A filter element 200 is disposed within the receiving cavity 110, dividing the receiving cavity 110 into a first separation channel 111 and a second separation channel 112. The inlet 120 is connected to the first separation channel 111, and the outlet 130 is connected to the second separation channel 112. A demagnetizing element 300 is disposed within the first separation channel 111.

[0027] The cleaning component 400 is movably disposed in the first separation channel 111 and is movably disposed on one side of the demagnetizing component 300. The cleaning component 400 is used to clean the surface material of the demagnetizing component 300.

[0028] The battery slurry foreign matter treatment device described in this application embodiment provides a sealed space for battery slurry processing through the receiving cavity 110 of the housing 100. The battery slurry enters the first separation channel 111 through the inlet 120 and flows through the demagnetizing component 300, where magnetic impurities in the battery slurry are adsorbed and captured. Subsequently, under pressure, the battery slurry passes through the filter 200 and enters the second separation channel 112, where the filter 200 removes non-magnetic impurities and agglomerates. Finally, the filtered battery slurry is output through the outlet 130. The cleaning component 400 is movably arranged on the outer wall of the demagnetizing component 300 and continuously moves relative to the demagnetizing component 300 during battery slurry processing, constantly cleaning the adsorption surface of the demagnetizing component 300, peeling away accumulated magnetic impurities from the surface of the demagnetizing component 300 and renewing the magnetic adsorption interface, thus maintaining the adsorption capacity of the demagnetizing component 300 dynamically stable.

[0029] The battery slurry foreign matter treatment device described in this application embodiment achieves dynamic self-cleaning of the demagnetizing component 300 through the cleaning component 400. This prevents magnetic impurities from accumulating excessively on the surface of the demagnetizing component 300, thus avoiding the formation of a magnetic field shield and ensuring long-term stable demagnetization efficiency. It eliminates the need for frequent shutdowns to disassemble and clean the magnetic rods, improving the continuous operation capability and production efficiency of the production line. Furthermore, the demagnetizing component 300 and the filter component 200 are integrated into the same receiving cavity 110, eliminating the need for connecting pipelines and buffer tanks between traditional two-stage series processes. This significantly reduces dead zones and residues during battery slurry transportation, making it particularly suitable for high-nickel cathodes, silicon-based anodes, and other battery slurries with high unit costs, thereby significantly reducing material loss and production costs.

[0030] In one exemplary embodiment, the surface layer of the demagnetizing component 300 is a corrosion-resistant, battery slurry-inert stainless steel or ceramic layer, and the surface magnetic induction intensity of the demagnetizing component 300 is not less than 8000 Gauss. Preferably, the demagnetizing component 300 uses neodymium iron boron N52 grade, and the surface material is a nickel-plated stainless steel layer with a surface magnetic induction intensity of 10000 Gauss.

[0031] In one exemplary embodiment, the filter element 200 is provided with a plurality of filter holes, and the first separation channel 111 and the second separation channel 112 are connected through the filter holes. Specifically, the filtration accuracy of the filter element 200 is 30μm~150μm, and the porosity of the filter element 200 is not less than 30%. Preferably, the filter element 200 is a wedge-shaped wire welded mesh with a filtration accuracy of 80μm and a porosity of 40%.

[0032] In some embodiments, such as Figures 1 to 3 As shown, the filter element 200 is configured as a cylindrical structure, and the demagnetizing element 300 is configured as a rod-shaped structure. The demagnetizing element 300 and the filter element 200 are coaxially arranged in the receiving cavity 110. The inner sidewall of the filter element 200 forms a first separation channel 111, and a second separation channel 112 is formed between the outer sidewall of the filter element 200 and the inner wall of the housing 100.

[0033] In this embodiment, a cylindrical filter element 200 and a rod-shaped demagnetizing element 300 are arranged coaxially. The inner side of the filter element 200 forms a first separation channel 111, and the outer side of the filter element 200 forms a second separation channel 112 between it and the inner wall of the housing 100. After entering the first separation channel 111, the battery slurry flows axially through the rod-shaped demagnetizing element 300, which fully adsorbs and removes magnetic impurities. Then, under pressure, it passes radially through the filter element 200 and enters the second separation channel 112, simultaneously achieving the screening and interception of non-magnetic impurities and agglomerates. The contact path between the battery slurry and the demagnetizing element 300 and the filter element 200 is reasonable, which not only ensures demagnetizing contact but also makes full use of the circumferential filtration area of ​​the filter element 200. The overall structure is compact and has a high space utilization rate.

[0034] In an optional embodiment, such as Figures 1 to 3 As shown, the battery slurry foreign matter treatment device also includes a drive mechanism 500, which is installed on the housing 100. The filter element 200 is rotatably disposed in the receiving cavity 110. The drive mechanism 500 is drivenly connected to the filter element 200 and is used to drive the filter element 200 to rotate in the receiving cavity 110. The cleaning element 400 is connected to the inner side wall of the filter element 200. The drive mechanism 500 is used to drive the cleaning element 400 and the filter element 200 to rotate around the demagnetizing element 300.

[0035] In this embodiment, the drive mechanism 500 drives the filter element 200 to rotate around the demagnetizing element 300. The cleaning element 400, connected to the inner wall of the filter element 200, rotates synchronously. During rotation, the cleaning element 400 continuously cleans the outer peripheral surface of the demagnetizing element 300, maintaining the adsorption activity of the surface of the demagnetizing element 300. At the same time, the centrifugal force generated by the rotation of the filter element 200 acts on the battery slurry, causing the battery slurry to quickly pass through the filter element 200, effectively alleviating the problem of agglomeration and clogging of high-viscosity slurry on the filter element 200, and significantly improving the filtration throughput and operational stability.

[0036] In an exemplary embodiment, the upper end of the filter element 200 is dynamically sealed to the housing 100 through a wear-resistant sealing ring, and the lower end of the filter element 200 is fixed with a driven gear, which meshes with the output gear of the drive mechanism 500.

[0037] In one exemplary embodiment, the drive mechanism 500 includes an explosion-proof variable frequency geared motor, which is connected to the housing 100 via a magnetic seal or a double-end mechanical seal. Further, the rotational speed of the drive mechanism 500 is adjusted within the range of 5 r / min to 50 r / min according to the viscosity and solid content of the battery slurry.

[0038] In an optional embodiment, such as Figures 1 to 3 As shown, the shell 100 is also provided with a slag discharge port 140, which is connected to the first separation channel 111. The feed port 120 is connected to the end of the first separation channel 111 away from the slag discharge port 140. Specifically, the slag discharge port 140 is provided with a pneumatic ball valve, which is used to periodically discharge the waste material in the first separation channel 111.

[0039] In this embodiment, the housing 100 is provided with a slag discharge port 140, and the feed port 120 and the slag discharge port 140 are respectively arranged at both ends of the first separation channel 111, so that the battery slurry forms an axial flow tendency from the feed port 120 to the slag discharge port 140 in the first separation channel 111. Magnetic impurities stripped from the surface of the demagnetizing component 300 by the cleaning component 400 and non-magnetic impurities and agglomerates trapped inside by the filter component 200 can gradually gather at one end of the slag discharge port 140 with the axially flowing battery slurry and be periodically discharged out of the receiving cavity 110 through the slag discharge port 140, which helps to continuously and stably maintain the demagnetization and filtration effect. Moreover, the slag discharge process is in a closed system throughout, which meets the cleanliness and explosion-proof safety requirements of battery slurry production.

[0040] In an optional embodiment, such as Figures 1 to 3 As shown, the cleaning component 400 includes cleaning blades connected to the inner wall of the filter component 200. The driving mechanism 500 drives the filter component 200 and the cleaning blades to rotate around the demagnetizing component 300. Specifically, the cleaning blades are welded to the inner wall of the filter component 200. By connecting the cleaning blades to the inner wall of the filter component 200, when the filter component 200 rotates, it drives the cleaning blades to rotate around the demagnetizing component 300, thereby removing the magnetic impurities adsorbed and accumulated on the demagnetizing component 300 and ensuring stable demagnetization efficiency.

[0041] Furthermore, the cleaning blade is configured as a spiral blade 410, and the spiral direction of the spiral blade 410 is configured to propel the surface material of the demagnetizing component 300 toward the slag discharge port 140 when rotating in the forward direction.

[0042] In this embodiment, the cleaning component 400 adopts a spiral blade 410 structure. The spiral blade 410 is connected to the inner wall of the filter component 200 and rotates synchronously with the filter component 200 around the demagnetizing component 300. During operation, the spiral blade 410 continuously scours the outer peripheral surface of the demagnetizing component 300 in the circumferential direction, dynamically peeling off the adsorbed and accumulated magnetic impurities. On the other hand, it forms an axial conveying force, pushing the peeled magnetic impurities and the non-magnetic impurities and agglomerates trapped on the inner side of the filter component 200 along the axial direction to the discharge port 140 for discharge. The spiral blade 410 can integrate circumferential shearing cleaning and axial pushing. Combined with the centrifugal field generated by the rotation of the filter component 200, it can achieve dynamic self-cleaning of the surface of the demagnetizing component 300, ensuring long-term stable demagnetization efficiency, and also prevent the accumulation of filter residue on the inner surface of the filter component 200, so that the filter screen pressure drop increases slowly. This effectively alleviates the filter screen clogging problem of high-viscosity slurry and significantly improves the continuous operation time and operational stability of the battery slurry foreign matter treatment device.

[0043] In an optional embodiment, such as Figures 1 to 3As shown, the spiral blade 410 is configured as a continuous spiral structure. The continuous spiral structure can form a coherent and complete axial conveying channel, which makes the pushing of stripped magnetic impurities and intercepted filter residue more stable and continuous, and the slag discharge is smoother. It is suitable for working conditions with high impurity content and continuous and stable slag discharge.

[0044] In other embodiments, the helical blades 410 may also include multiple helical blades 410, which are intermittently arranged on one side of the demagnetizing component 300 to reduce the overall contact area between the helical blades 410 and the battery slurry, reduce the rotational driving resistance, and are more suitable for high viscosity slurry systems.

[0045] This application, through flexible blade structure selection, can ensure the core functions of dynamic self-cleaning and axial slag removal on the surface of the demagnetizing component 300, while balancing the continuity of slag removal, the intensity of scraping and cleaning, and the power consumption of operation, thereby improving the adaptability to different battery slurry characteristics and production conditions.

[0046] In an optional embodiment, the pitch of the helical blade 410 is set to 0.7 to 0.9 times the diameter of the filter element 200, and the helix angle of the helical blade 410 is set to 12° to 18°.

[0047] This embodiment adapts the parameter range of the spiral blade 410 to the diameter of the cylindrical filter element 200, so that as the spiral blade 410 rotates with the filter element 200, it can not only form sufficient circumferential scraping and shearing action on the outer peripheral surface of the demagnetizing element 300, fully stripping the magnetic impurities adsorbed on the surface of the demagnetizing element 300, but also generate a moderate axial conveying thrust on the battery slurry, driving the stripped magnetic impurities and the intercepted filter residue to move towards the slag discharge port 140, avoiding the accumulation and blockage of filter residue in the first separation channel 111, improving the efficiency of slag discharge and conveying of the spiral blade 410, and ensuring the long-term stability of the battery slurry foreign matter treatment device.

[0048] In an optional embodiment, such as Figures 1 to 3 As shown, the battery slurry foreign matter treatment device also includes a mounting bracket 160, which is connected to the housing 100. The demagnetizing component 300 is detachably mounted on the mounting bracket 160. The housing 100 is provided with a mounting hole 150, through which the demagnetizing component 300 is inserted into the first separation channel 111. That is to say, the demagnetizing component 300 can be disassembled and replaced using the mounting bracket 160, so different sizes of demagnetizing components 300 can be replaced as needed during use.

[0049] In this embodiment, the demagnetizing component 300 is inserted into the first separation channel 111 through the mounting hole 150 and detachably fixed to the mounting bracket 160, forming a modular and detachable structure. This allows for flexible replacement of demagnetizing components 300 of different sizes and magnetic field strength parameters according to the demagnetization accuracy requirements or magnetic impurity content of different battery slurries, significantly improving the adaptability of the battery slurry foreign matter treatment device to different production needs. On the other hand, when the demagnetizing component 300 is demagnetized, has surface damage, or requires deep cleaning and maintenance, it can be removed separately for replacement or cleaning without disassembling the entire machine, greatly reducing equipment maintenance difficulty and downtime, and ensuring the continuous operation efficiency of the production line.

[0050] In an optional embodiment, such as Figures 1 to 3 As shown, the radial clearance D of the first separation channel 111 is set to 5mm~25mm. Specifically, the radial clearance D of the first separation channel 111 can be changed by replacing the demagnetizing element 300 and the filter element 200 with different sizes.

[0051] In this embodiment, the radial gap D of the first separation channel 111 is limited to 5mm~25mm, and this radial gap D can be flexibly adjusted by replacing the demagnetizing element 300 with different outer diameter specifications or the filter element 200 with different inner diameter specifications. The range of this radial gap D ensures that the battery slurry and the surface of the demagnetizing element 300 maintain an appropriate working distance, so that magnetic impurities in the slurry can be effectively captured by the magnetic field, ensuring stable demagnetization efficiency, while reserving sufficient flow cross section to avoid obstruction of high viscosity slurry flow. At the same time, it matches the scraping action space of the spiral blade 410 to ensure smooth execution of self-cleaning and slag discharge functions, greatly improving the equipment's versatility for different types of battery slurry and meeting the production needs of multiple types of battery slurry.

[0052] Example 1 In this embodiment, the LiFePO4 cathode slurry is processed. The solid content of the LiFePO4 cathode slurry is 62%, the viscosity is 10000 mpa.s, and it contains about 200 ppm of ferromagnetic impurities and a small amount of incompletely dispersed agglomerates.

[0053] The LiFePO4 cathode slurry is continuously fed into the first separation channel 111 from the inlet 120 at a flow rate of 200 L / h. The filter element 200 rotates clockwise at 12 r / min. Within the first separation channel, the LiFePO4 cathode slurry is propelled by the rotating helical blades 410, moving axially downwards through the first separation channel 111 while simultaneously passing through the filter element 200 and entering the second separation channel 112 under centrifugal force. Qualified LiFePO4 cathode slurry then flows out from the outlet 130 to the coating head. Non-magnetic impurities and agglomerates larger than 80 μm are trapped on the inner wall of the filter element 200 and move to the bottom discharge port 140 under the downward thrust of the helical blades 410. Simultaneously, magnetic impurities as small as 1-5 μm in the LiFePO4 cathode slurry are adsorbed as they flow over the surface of the demagnetizing element 300. As the filter element 200 rotates continuously, the spiral blades 410 exert a uniform, low-shear sweeping effect on the surface of the demagnetizing element 300, causing the adsorbed magnetic impurities to be continuously pushed towards the slag discharge port 140. The battery slurry foreign matter treatment device operates continuously for 8 hours, and the slag discharge port 140 discharges once every 2 hours, with the collected filter residue appearing as a dry mud cake.

[0054] After testing, such as Figure 4 As shown, the content of magnetic impurities in the slurry at the discharge port is reduced to below 8 ppm, and particles larger than 50 μm are completely eliminated. After 8 hours of operation, the pressure difference of the filter element 200 is 0.12 MPa, and the initial pressure difference is 0.08 MPa. The initial pressure difference of the existing vibrating screen group is 0.08 MPa, and the pressure difference after 8 hours of operation is 0.35 MPa. The pressure difference increase of the filter element 200 in this embodiment is much lower than that of the existing vibrating screen group.

[0055] Example 2 This embodiment processes NCM811 cathode slurry with a higher viscosity. The NCM811 cathode slurry has a solid content of 70% and a viscosity of 18000 mPa·s. The radial clearance D of the first separation channel 111 of the battery slurry foreign matter treatment device is adjusted to 18 mm, and the rotation speed of the filter element 200 is reduced to 8 r / min, thus reducing the battery slurry flow rate to 120 L / h. Operational results show that the magnetic impurity removal rate reaches over 95%, and no clogging of the filter element 200 or accumulation of magnetic impurities on the surface of the demagnetizing element 300 occurs. Therefore, the battery slurry foreign matter treatment device of this embodiment can adapt to battery slurries with different characteristics by adjusting the radial clearance D and the rotation speed.

[0056] Comparative Examples Using a static magnetic rod box from existing technology, comprising six magnetic rods with a surface magnetic field of 10,000 Gauss, and paired with a vibrating screen with a filtration accuracy of 80 μm, a LiFePO4 cathode slurry was processed in series. This LiFePO4 cathode slurry had a solid content of 62%, a viscosity of 10,000 mPa·s, and contained approximately 200 ppm of ferromagnetic impurities and a small amount of incompletely dispersed agglomerates. After two hours of operation, the magnetic impurity content at the outlet of the static magnetic rod box increased from the initial 200 ppm to 65 ppm, and the removal rate decreased to 67.5%. The removed magnetic rods showed a layer of magnetic impurities adhering to their surfaces. The vibrating screen required shutdown and cleaning after four hours of operation due to blockage.

[0057] Comparative examples show that, as Figure 4 As shown, after 8 hours of operation, the pressure rise of the filter element 200 in this embodiment is only 1 / 3 of that of a traditional vibrating screen, and the magnetic impurity removal rate remains above 98%, while the removal rate of the static magnetic rod box drops below 70% after 2 hours. Therefore, this embodiment significantly outperforms existing combinations in terms of continuous operation capability and long-term demagnetization stability.

[0058] On the other hand, this application also provides a method for treating foreign matter in battery slurry, applicable to the battery slurry foreign matter treatment apparatus described in any of the above embodiments, comprising the following steps: The battery slurry to be processed is fed into the first separation channel 111 from the feed inlet 120; The battery slurry flows through the filter element 200 and enters the second separation channel 112 to filter out non-magnetic impurities and agglomerates in the battery slurry; The demagnetizing component 300 adsorbs magnetic impurities in the flowing battery slurry; The cleaning component 400 continuously cleans the magnetic impurities adsorbed on the surface of the demagnetizing component 300 in order to maintain the adsorption capacity of the demagnetizing component 300. The battery slurry filtered in the second separation channel 112 is discharged from the outlet 130.

[0059] The battery slurry foreign matter treatment method described in this application embodiment simultaneously completes the demagnetization and filtration processes within the receiving cavity 110 of the housing 100. After the slurry to be treated is fed into the first separation channel 111 through the feed inlet 120, the demagnetizing component 300 adsorbs and captures the magnetic impurities in the flowing battery slurry. At the same time, the cleaning component 400 continuously cleans the adsorption surface of the demagnetizing component 300 to remove accumulated magnetic impurities and maintain the adsorption capacity of the demagnetizing component 300. Under pressure differential, the battery slurry passes through the filter element 200 and enters the second separation channel 112, where non-magnetic impurities and agglomerates are simultaneously screened and intercepted. The purified slurry is then discharged from the outlet 130. This integrates the demagnetization and filtration processes into a single unit, eliminating the need for intermediate pipeline transfers and reducing slurry residue dead zones and material loss. Simultaneously, the dynamic self-cleaning function of the cleaning element 400 prevents the demagnetizing element 300 from becoming saturated, ensuring long-term stable demagnetization efficiency. This effectively improves the continuity and quality consistency of battery slurry processing, meeting the needs of mass production of battery slurry.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery slurry foreign matter treatment device, characterized in that, include: The housing (100) is provided with a receiving cavity (110), a feed inlet (120) and a discharge outlet (130), the feed inlet (120) and the discharge outlet (130) being connected to the receiving cavity (110). A filter element (200) is provided with filter holes. The filter element (200) is disposed in the receiving cavity (110). The filter element (200) divides the receiving cavity (110) into a first separation channel (111) and a second separation channel (112). The feed inlet (120) is connected to the first separation channel (111), and the discharge outlet (130) is connected to the second separation channel (112). The first separation channel (111) and the second separation channel (112) are connected through the filter holes. A demagnetizing component (300) is disposed within the first separation channel (111); A cleaning component (400) is movably disposed within the first separation channel (111) and is used to clean the surface magnetic impurities of the demagnetizing component (300).

2. The battery slurry foreign matter treatment device according to claim 1, characterized in that: The filter element (200) is configured as a cylindrical structure, and the demagnetizing element (300) is configured as a rod-shaped structure. The demagnetizing element (300) and the filter element (200) are coaxially disposed in the receiving cavity (110). The inner sidewall of the filter element (200) forms the first separation channel (111), and the outer sidewall of the filter element (200) and the inner wall of the housing (100) form the second separation channel (112).

3. The battery slurry foreign matter treatment device according to claim 2, characterized in that: The battery slurry foreign matter treatment device further includes a drive mechanism (500), which is installed on the housing (100). The drive mechanism (500) is connected to the filter element (200) and is used to drive the filter element (200) to rotate in the receiving cavity (110). The cleaning element (400) is connected to the inner sidewall of the filter element (200). The drive mechanism (500) is used to drive the cleaning element (400) and the filter element (200) to rotate around the demagnetizing element (300).

4. The battery slurry foreign matter treatment device according to claim 3, characterized in that: The housing (100) is also provided with a slag discharge port (140), which is connected to the first separation channel (111), and the feed port (120) is connected to the end of the first separation channel (111) away from the slag discharge port (140).

5. The battery slurry foreign matter treatment device according to claim 4, characterized in that: The cleaning component (400) includes a cleaning blade connected to the inner wall of the filter component (200), and the driving mechanism (500) drives the filter component (200) and the cleaning blade to rotate around the demagnetizing component (300).

6. The battery slurry foreign matter treatment device according to claim 5, characterized in that: The cleaning blade is configured as a spiral blade (410), and the spiral direction of the spiral blade (410) is configured to push the magnetic impurities of the demagnetizing element (300) toward the slag discharge port (140) when rotating in the forward direction.

7. The battery slurry foreign matter treatment device according to claim 6, characterized in that: The pitch of the spiral blade (410) is set to 0.7 to 0.9 times the diameter of the filter element (200), and the helix angle of the spiral blade (410) is set to 12° to 18°.

8. The battery slurry foreign matter treatment device according to claim 1, characterized in that: The battery slurry foreign matter treatment device also includes a mounting bracket (160), which is connected to the housing (100). The cleaning component (400) is detachably mounted on the mounting bracket (160). The housing (100) is provided with a mounting hole (150), and the cleaning component (400) is inserted into the first separation channel (111) through the mounting hole (150).

9. The battery slurry foreign matter treatment device according to any one of claims 1-8, characterized in that: The radial clearance D of the first separation channel (111) is set to 5mm~25mm.

10. A method for treating foreign matter in battery slurry, applicable to the battery slurry foreign matter treatment apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: The battery slurry to be processed is fed into the first separation channel (111) from the feed port (120). The battery slurry flows through the filter element (200) into the second separation channel (112) to filter out non-magnetic agglomerates of the battery slurry; The demagnetizing component (300) adsorbs magnetic impurities in the battery slurry flowing through it; The cleaning component (400) continuously cleans the magnetic impurities adsorbed on the surface of the demagnetizing component (300) to maintain the adsorption capacity of the demagnetizing component (300). The battery slurry filtered in the second separation channel (112) is discharged from the outlet (130).

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