Filtering device of electrolyte material and filtering method thereof

Abstract

According to the filtering method of the electrolyte material, a filtering assembly is used for filtering, and the filtering assembly comprises a shell, a roller, a driving mechanism, a filtering plate, a flow guide table and a filtering cylinder; the filtering method comprises the following steps: S1, guiding a to-be-filtered material to a filtering plate by a flow guide table 105; s2, performing primary filtration on the to-be-filtered material by a filter plate; s3, performing secondary filtration on the to-be-filtered material subjected to primary filtration under the action of centrifugal force through a filter cartridge; wherein the driving mechanism drives the roller to rotate, and controls the rotating speed r of the filter drum to be greater than a first threshold r1, so that the to-be-filtered material is only distributed on the side wall of the filter drum. The device is compact and reasonable in structure and convenient to operate, and efficient and accurate filtration of an electrolyte material is realized by adopting a multi-stage filtration strategy. The slope design and periodic frequency conversion control of the roller and the filter cartridge enable the materials to be filtered to be uniformly distributed and effectively move under the action of centrifugal force, so that the contact opportunity of the materials and the filter medium is increased, and the filter efficiency is improved.

Description

[0001] The present invention is a divisional application of an invention patent with application date of 20241012, application number CN202411418934.7, and name “Filtering device for electrolyte material and filtering method thereof”. Technical Field

[0002] The invention relates to the technical field of electrolyte filtration, in particular to a filtering device for electrolyte materials. Background Art

[0003] Electrolytes and electrolytes are the "blood" of lithium-ion batteries. Their solubility, stability, ionic conductivity, etc. play an important role in the comprehensive electrochemical performance of lithium-ion batteries. For example, lithium difluorooxalatoborate has good compatibility with positive and negative electrodes, high and low temperature performance and good cycle performance. Therefore, it can be used as a film-forming additive in lithium battery electrolytes or as a conductive salt to replace lithium hexafluorophosphate. Lithium tetrafluoroborate has good chemical stability and thermal stability, is insensitive to environmental moisture, and is expected to develop into an excellent electrolyte widely used in the field of energy storage and power lithium-ion batteries. Lithium bis(oxalatoborate) has a relatively wide electrochemical window, good thermal stability, good solubility and high conductivity, and is expected to replace LiPF6 and be widely used in electrolytes of commercial lithium-ion batteries.

[0004] With the continuous development of lithium-ion battery and sodium-ion battery technology, the performance optimization of electrolytes and electrolytes has become the key to improving the comprehensive electrochemical performance of batteries. New electrolyte materials such as lithium difluorooxalatoborate, lithium tetrafluoroborate, lithium bis(oxalatoborate), sodium bis(fluorosulfonyl)imide and sodium difluorooxalatoborate for sodium-ion batteries are gradually showing their potential to replace traditional materials due to their unique solubility, stability, ionic conductivity and safety performance. However, although these new materials are effective in improving battery performance, the strict requirements for foreign matter control in their production process have become a technical challenge that cannot be ignored.

[0005] In traditional processes, foreign matter in the production process is removed by filtering. Although it can ensure the purity of the electrolyte to a certain extent, it has significant defects. First, the filtration system usually requires a multi-stage setting, such as using a large-aperture filter (such as a bag filter) for preliminary filtration, and then using a small-aperture filter (such as a filter element) for fine filtration. This not only increases the complexity of the production process, but also leads to the need for more pipes, valves and sites, increasing production costs and floor space. Secondly, the rotation and frequent replacement of the filter not only affects production efficiency, but may also introduce new sources of pollution due to improper operation. In addition, the filtration effect is affected by multiple factors such as the filter material, pore size and filtration pressure, making it difficult to achieve stable and efficient quality control.

[0006] Therefore, in the process of electrolyte production, how to effectively remove foreign matter, simplify the production process, reduce costs, improve production efficiency, and maintain the high purity of the electrolyte has become a technical problem that needs to be solved urgently.

[0007] To this end, we propose a filtering device for electrolyte materials and a filtering method thereof. Summary of the invention

[0008] In view of the shortcomings of the above-mentioned existing production technologies, the present application provides a filtering device for electrolyte materials, which achieves efficient and accurate filtration of electrolyte materials by adopting a multi-stage filtration strategy.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A filtering device for electrolyte material, comprising:

[0011] A filter assembly, the number of which is at least one and is used for multi-stage filtration of the material to be filtered;

[0012] The structure of the filter assembly includes:

[0013] A shell, which is a vertical cylindrical structure;

[0014] A roller, which is arranged along the axial direction of the shell and is rotatably connected in the cavity of the shell;

[0015] A driving mechanism, which is used to drive the drum to rotate;

[0016] The filter plate is an annular structure, which is radially extended inward from the lower part of the drum and is used for primary filtration of the material to be filtered;

[0017] The guide platform is arranged at the axis of the drum and extends radially outward to the annular filter plate, and is used to guide the material to be filtered to the annular filter plate;

[0018] The filter cartridge is detachably fixed to the lower end of the drum. The filter cartridge is a frustum-shaped cylindrical structure with an expanded upper end. The filter cartridge covers the filter plate and performs secondary filtration on the material to be filtered under the action of centrifugal force.

[0019] As a further improvement of the above technical solution:

[0020] It also includes a filtrate bin connected to the lower end of the filter assembly for receiving the filtered filtrate, the lower end of the filtrate bin is connected to a liquid outlet, and the lower end of the liquid outlet is connected to an electric control valve, and a sensor for detecting the filtration quality is also arranged in the filtrate bin;

[0021] The number of the filter components is greater than or equal to two, and the multiple filter components are arranged in a stacked manner. When stacked, the liquid outlet of the filtrate bin of the upper filter component is inserted into the drum cavity of the lower filter component.

[0022] The filter cartridge is connected to the drum via a quick connector, and a plurality of equally spaced strong magnetic rods are arranged on the inner wall of the filter cartridge to achieve flow diversion while absorbing magnetic impurities in the material to be filtered.

[0023] The drive mechanism mounting box is fixed on the outer wall of the shell. The drive mechanism includes a motor, which is a variable frequency motor, and a main drive gear connected to the driving end of the motor. The main drive gear passes through a prefabricated hole opened on the shell and meshes with the drive gear ring on the outer wall of the drum.

[0024] The angle α between the normal of the filter cartridge and the vertical direction is between 5° and 45°, the inner diameter of the drum decreases from top to bottom, the angle β between the inner wall of the drum and the vertical direction is β<α, and strong magnetic bars are equidistantly distributed on the inner wall of the drum.

[0025] A support ring is connected to the inner wall of the shell, and the upper end of the support ring supports the roller through a plane bearing, and the outer wall of the roller is connected to the inner wall of the shell through a bearing group.

[0026] The guide platform adopts a conical structure with the tip facing upward, and guide strips are arranged on the surface of the guide platform.

[0027] The filter plate and the filter cartridge are both provided with filter holes, the pore size of the filter holes of the filter plate is between 5 and 10 microns, and the pore size of the filter holes on the filter cartridge is between 0.1 and 0.5 microns. If and only if there are multiple filter components, the pore size of the filter cartridge in the lower filter component of two adjacent filter components is ≤ the pore size of the filter cartridge in the upper filter component.

[0028] The filter assembly also includes one or more of the following a, b, c, d:

[0029] a) The drainage and cleaning system includes a pump, the inlet of the pump is connected to the filtrate bin for extracting the filtrate in the filtrate bin, and a branch pipe is arranged at the outlet of the pump, one of the branches is used to discharge the filtrate, and the other branch pipe is provided with a cleaning nozzle, the nozzle facing the outer wall of the filter cartridge;

[0030] b) A controller, which is mounted on the outer wall of the housing and is used to control various electrical devices;

[0031] c) an observation window, which is used to observe the interior of the housing;

[0032] d) Inspection door, which is arranged on the outer wall of the shell and is used for inspecting and replacing the filter cartridge.

[0033] A method for filtering an electrolyte material, using the above-mentioned filtering device for the electrolyte material to filter, the filtering method comprising:

[0034] The drum is driven to rotate by a driving mechanism;

[0035] The material to be filtered is guided to the filter plate by a flow guide platform which is arranged at the axis of the drum and extends radially outward to the annular filter plate;

[0036] Performing primary filtration on the material to be filtered by using a filter plate arranged at the lower part of the drum and extending radially inward; and

[0037] The material to be filtered after the primary filtration is subjected to secondary filtration through the filter cartridge.

[0038] As a further improvement of the above technical solution:

[0039] include:

[0040] S1. The drum realizes periodic frequency conversion rotation under the action of the driving mechanism. The material to be filtered enters the drum from the middle of the upper part of the drum and first contacts the guide table. Under the action of the guide table, the material to be filtered is evenly distributed to the lower end of the drum side wall;

[0041] S2, by using a periodic frequency conversion motor to control the speed of the drum, the speed is periodically gradually increased-gradually decreased-gradually increased;

[0042] S3. When the motor speed increases to the point where the centrifugal force of the material to be filtered is greater than its own gravity, the material to be filtered will move upward along the slope of the drum under the action of the centrifugal force, thereby caching a portion of the material to be filtered. At the same time, the strong magnetic rod on the drum can absorb some of the magnetic impurities.

[0043] S4. As the motor speed gradually decreases, when the centrifugal force of the material to be filtered is less than its own gravity, it moves downward along the filter plate into the filter cartridge and undergoes primary filtration through the filter plate;

[0044] S5. The material to be filtered is subjected to secondary filtration in the filter cartridge. At the same time, when the material to be filtered flows along the side wall of the filter cartridge, it will pass through the strong magnetic rod to adsorb the magnetic impurities again;

[0045] S6. At the same time, as the motor speed changes periodically, the material to be filtered will move up and down along the side wall of the filter cartridge, thereby achieving the effect of evenly filtering the material to be filtered on the entire side wall of the filter cartridge;

[0046] S7, after multiple layers of filtration are performed by multiple stacked filter components, multi-layer filtration is achieved.

[0047] The beneficial effects of the present invention are as follows:

[0048] The present invention has a compact and reasonable structure and is easy to operate. By adopting a multi-layer and multi-stage filtering strategy, it achieves efficient and accurate filtering of electrolyte materials. The slope design of the drum and the filter cartridge and the periodic frequency conversion control enable the material to be filtered to be evenly distributed and effectively moved under the action of centrifugal force, increasing the contact opportunity between the material and the filter medium and improving the filtering efficiency. The stacked arrangement of the multi-layer filter components and the gradually reduced filter aperture design can remove impurity particles of different sizes, ensuring that the final filtrate quality meets the standards and meets high-standard production requirements.

[0049] At the same time, the present invention also has the following advantages:

[0050] 1. The filtering device in the present invention realizes efficient filtration of electrolyte materials through ingenious structural design. First, the inner diameter of the drum decreases from top to bottom to form a slope, which is convenient for the material to be filtered to move upward under the action of centrifugal force. This design improves the fluidity and filtration efficiency of the material. Secondly, the strong magnetic rods on the inner wall of the drum can adsorb magnetic impurities in the material to be filtered, further improving the filtration effect. In addition, the detachable design of the filter cartridge facilitates the cleaning of impurities and the replacement of the filter cartridge, and improves maintenance efficiency. At the same time, the angle α between the normal of the filter cartridge and the vertical direction is designed to facilitate the discharge of the filtrate and improve the thoroughness of the filtration. Finally, through the design of auxiliary components such as the controller, observation window and inspection door, the operability and maintainability of the device are improved, making the entire filtration process more convenient and efficient.

[0051] 2. The filtering device in the present invention further improves the filtering effect by adopting a stacked arrangement of multiple filtering components. This stacked design not only increases the filtering area, but also realizes multi-layer filtering, which can remove impurity particles of different sizes and ensure that the final filtrate quality meets the standards. At the same time, the aperture design of the filter cartridge and the filter plate in two adjacent filtering components ensures that the filtering accuracy is improved step by step, further improving the filtering effect. In addition, the controller can automatically adjust the motor speed and frequency according to the filtering quality data fed back by the sensor, realizing intelligent filtering control. This design not only improves the filtering efficiency, but also reduces manual intervention and reduces operating costs. It has significant beneficial effects.

[0052] 3. The present invention further improves the practicality and maintainability of the filter device by equipping it with a drainage and cleaning system. The drainage system can conveniently discharge the filtered filtrate, while the cleaning system can efficiently clean the filter cartridge to maintain its filtering performance. In particular, the cleaning nozzle adopts a high-pressure fan-shaped nozzle, which can cover the height of the filter cartridge and achieve comprehensive cleaning as the filter cartridge rotates. This design improves the cleaning efficiency and effect. In addition, the configuration of the drainage and cleaning system also extends the service life of the filter device and reduces maintenance costs.

[0053] 4. The filtering method of the present invention achieves efficient and accurate filtering effects by periodically controlling the drum speed through frequency conversion and combining the design of multi-layer and multi-stage filtering components. The drum speed is controlled through frequency conversion, so that the material to be filtered experiences different centrifugal forces in the drum, thereby achieving uniform distribution and effective filtration of the material. In the stage of increasing speed, the material moves upward along the slope of the drum under the action of centrifugal force, caching a part of the material and increasing the contact opportunity with the filter medium; in the stage of decreasing speed, the material enters the filter cartridge downward with the filter plate for secondary filtration. This periodic change not only improves the filtration efficiency, but also ensures the stability of the filtration quality. In addition, the method also takes into account the change in the amount of material to be filtered, and realizes effective processing of different amounts of material by adaptively adjusting the upper limit of the motor speed. When the amount of material is large, the upper limit of the speed is increased to cache part of the material and adsorb magnetic impurities; when the amount of material is small, the upper limit of the speed is reduced to achieve a normal filtering effect. This flexibility enables the method to adapt to the needs of different production scenarios and improve production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural schematic diagram of the present invention.

[0055] Figure 2 It is a schematic structural diagram of a single-layer filter assembly of the present invention.

[0056] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the filter device.

[0057] Wherein: 10, filter assembly; 20, filtrate tank;

[0058] 100, housing; 101, driving mechanism; 102, controller; 103, observation window; 104, drum; 1041, bearing assembly; 105, guide platform; 106, filter plate; 107, support ring; 108, plane bearing; 109, driving gear ring; 110, quick connector; 111, filter cartridge; 112, strong magnetic rod; 113, drainage and cleaning system;

[0059] 201, liquid outlet; 202, sensor; 203, electric control valve. DETAILED DESCRIPTION

[0060] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0061] The present invention provides a filtering device for an electrolyte material and a filtering method thereof, aiming to achieve high-efficiency and high-precision filtering of the electrolyte material through innovative structural design and optimized process flow.

[0062] Example 1: Figure 2As shown, this embodiment discloses a filtering device for electrolyte materials, and its structure includes a filtering component 10 and a filtrate tank 20. In this embodiment, there is only one filtering component 10, and the filtering component 10 is the core of the device, which is responsible for multi-stage filtration of the material to be filtered; the filtrate tank 20 is used to collect the filtrate after filtration and control the discharge through the electric control valve 203; the auxiliary components include a controller 102, an observation window 103, an inspection door, etc., which are used to improve the operability and maintainability of the device.

[0063] Specifically, Figure 2 and Figure 3 As shown, the filter assembly 10 in this embodiment is composed of main components such as a housing 100, a drum 104, a driving mechanism 101, a filter plate 106, a guide platform 105, and a filter cartridge 111.

[0064] The housing 100 in this embodiment adopts a vertical cylindrical structure to provide support and protection for the drum 104 and other internal components. A support ring 107 is connected to the inner wall of the housing 100, and the support ring 107 supports the drum 104 through a plane bearing 108 to ensure that the drum 104 can rotate smoothly.

[0065] The drum 104 in this embodiment is arranged along the axial direction of the housing 100 and is connected to the inner wall of the housing 100 through a bearing group 1041. The inner diameter of the drum 104 decreases from top to bottom, forming a slope, which facilitates the upward movement of the material to be filtered under the action of centrifugal force. Strong magnetic bars 112 are evenly distributed on the inner wall of the drum 104 to absorb magnetic impurities in the material to be filtered.

[0066] The inner diameter of the drum 104 decreases from top to bottom, and the angle β between the inner wall of the drum 104 and the vertical direction makes it easier for the filtered material to move upward along the slope under the action of centrifugal force. At the same time, the strong magnetic bars 112 on the drum 104 are arranged more densely to improve the adsorption efficiency of magnetic impurities.

[0067] The driving mechanism 101 in this embodiment is mounted on the outer wall of the housing 100, and includes a variable frequency motor and a main driving gear. The variable frequency motor is connected to the main driving gear through the driving end, and the main driving gear passes through the prefabricated hole on the housing 100 and meshes with the driving gear ring 109 on the outer wall of the drum 104, thereby driving the drum 104 to rotate. The variable frequency motor in this embodiment can achieve periodic frequency conversion, that is, it can periodically achieve uniform rotation speed from fast to slow and from slow to fast.

[0068] The filter plate 106 in this embodiment is annular in structure and is radially extended inward from the lower part of the drum 104. The filter plate 106 is provided with filter holes with a diameter of 5 to 10 microns for primary filtration of the material to be filtered. The filter plate 106 also serves as a connecting structure of the guide platform 105 to improve the overall stability. The number of filter holes on the filter plate 106 is also set according to actual usage.

[0069] The guide platform 105 in this embodiment is arranged at the axis of the drum 104 and adopts a conical structure with the tip facing upward. In actual use, the material to be filtered, that is, the battery filtrate, is transported from the axial direction of the guide platform 105. The guide platform 105 can make the battery filtrate more evenly distributed to the subsequent filter plate 106 and the side wall of the filter cartridge 111, thereby improving the subsequent filtering effect, such as making full use of the filtering area; in particular, it can also improve the stability of the filtering equipment to prevent equipment loss, such as the material is concentrated on one side of the filter plate 106 or the filter cartridge 111, causing the overall center of gravity to deviate from the rotation axis, and the equipment will produce obvious shaking, which will cause fatigue loss to the various connections or connections of the equipment over time.

[0070] In another embodiment, in order to further ensure the uniformity of the distribution, equidistantly distributed guide strips are set on the surface of the guide platform 105. Even if the battery filtrate is not transported from the axial direction, the battery filtrate can be evenly distributed through the set guide strips. The guide platform 105 extends radially outward to the annular filter plate 106, which is used to evenly guide the material to be filtered onto the annular filter plate 106.

[0071] At the same time, in this embodiment, the drum 104, the filter plate 106 and the guide platform 105 are processed by an integrated molding method; in other embodiments, the drum 104, the filter plate 106 and the guide platform 105 can also be connected by welding to improve the overall stability and increase the service life.

[0072] The filter cartridge 111 in this embodiment is detachably fixed to the lower end of the drum 104 and connected to the drum 104 via a quick connector 110, which facilitates quick disassembly of the filter cartridge 111 and cleaning of impurities. In addition, the quick connector 110 can also achieve synchronous rotation of the drum 104 and the filter cartridge 111. The types of quick connectors 110 include clamp-type quick connectors, threaded quick connectors, latch-type quick connectors, or other quick connectors that can achieve the same effect.

[0073] The filter cartridge 111 is a frustoconical cylindrical structure with a flared upper end, covering the filter plate 106. The angle α between the normal of the filter cartridge 111 and the vertical direction is between 5° and 45°, which is convenient for the discharge of the filtrate, so that the battery filtrate at the lower end of the filter cartridge 111 can move along the side wall of the filter cartridge 111 under the action of centrifugal force, thereby improving the filtering effect. A plurality of equally distributed strong magnetic rods 112 are arranged on the inner wall of the filter cartridge 111 to achieve flow diversion while adsorbing magnetic impurities in the material to be filtered. The pore size of the filter holes on the filter cartridge 111 is between 0.1 and 0.5 microns, which is used for secondary filtration of the material to be filtered.

[0074] At the same time Figure 3 As shown, in this embodiment, the angle β between the inner wall of the drum 104 and the vertical direction is less than the angle between the normal of the filter cartridge 111 and the vertical direction, so that even if the motor speed is low, the battery filtrate can flow up and down along the side wall of the drum 104 under the action of centrifugal force.

[0075] The filtrate bin 20 in this embodiment is connected to the lower end of the filter assembly 10. In this embodiment, the filtrate bin 20 and the filter assembly 10 are also connected by a quick connection, and its structure is equivalent to the above-mentioned quick connector 110. By quickly disassembling the filtrate bin 20, the filter cartridge 111 can be replaced and cleaned to receive the filtered filtrate. The lower end of the filtrate bin 20 is connected to a liquid outlet 201, and the lower end of the liquid outlet 201 is connected to an electric control valve 203 for controlling the discharge of the filtrate.

[0076] A sensor 202 is also provided in the filtrate bin 20 for detecting the filtration quality to ensure that the filtration effect meets the standard. Here, the sensor 202 includes a turbidity sensor, a concentration sensor and other sensors that can identify impurities in the battery liquid.

[0077] After detection by sensor 202, if the battery filtrate does not meet the standard, it can be discharged through the electric control valve 203 and filtered through multiple cycles to improve the filtering effect; at the same time, in subsequent cycle filtration, a filter cartridge 111 with a smaller pore size can be used for filtering.

[0078] like Figure 2 and Figure 3 As shown, this embodiment also includes a controller 102, an observation window 103, an inspection door, etc. The controller 102 is installed on the outer wall of the housing 100, and is used to control various electrical devices and achieve more accurate filtering control; the observation window 103 is used to observe the inside of the housing 100, so as to find and deal with abnormal situations in time; the inspection door is arranged on the outer wall of the housing 100, and is used for maintenance work such as inspection and replacement of the filter cartridge 111.

[0079] The filtration device in this embodiment achieves efficient filtration of electrolyte materials through ingenious structural design. First, the inner diameter of the drum 104 decreases from top to bottom to form a slope, which is convenient for the material to be filtered to move upward under the action of centrifugal force. This design improves the fluidity and filtration efficiency of the material. Secondly, the strong magnetic rod 112 on the inner wall of the drum 104 can adsorb magnetic impurities in the material to be filtered, further improving the filtration effect. In addition, the detachable design of the filter cartridge 111 facilitates the cleaning of impurities and the replacement of the filter cartridge, and improves maintenance efficiency. At the same time, the angle α between the normal of the filter cartridge 111 and the vertical direction is designed to facilitate the discharge of the filtrate and improve the thoroughness of the filtration. Finally, through the design of auxiliary components such as the controller 102, the observation window 103 and the inspection door, the operability and maintainability of the device are improved, making the entire filtration process more convenient and efficient.

[0080] Example 2: Figure 1 As shown, another filtering device of electrolyte material is disclosed in this embodiment, which is different from Example 1 in that in this embodiment, the number of filter components 10 is greater than or equal to two, and multiple filter components 10 are arranged in a stacked manner. When stacked, the liquid outlet 201 of the filtrate bin 20 of the upper filter component 10 is inserted into the inner cavity of the drum 104 to achieve multi-layer filtration and further improve the filtering effect. In two adjacent filter components 10, the aperture of the filter cartridge 111 in the lower filter component 10 is ≤ the aperture of the filter cartridge 111 in the upper filter component 10, and the aperture of the filter plate 106 in the lower filter component 10 is ≤ the aperture of the filter plate 106 in the upper filter component 10, ensuring that the filtering accuracy is improved step by step.

[0081] In addition, the controller 102 in this embodiment can automatically adjust the motor speed and frequency according to the filtering quality data fed back by the sensor 202, thereby improving the effect of multi-layer filtering.

[0082] In this embodiment, multi-layer filtration and the use of filter plates 106 and filter cartridges 111 with different pore sizes can improve the filtration effect at one time, thereby avoiding the need to transfer the filtered water to the original or new filter assembly for multiple cycles in order to improve the filtration effect in Example 1. At the same time, if the filter cartridges with different pore sizes are not replaced, the filtration effect will be very limited even after multiple cycles. At the same time, during cyclic filtration, even if the filter cartridges are replaced, the original filter assembly 10 needs to be cleaned.

[0083] At the same time, the structural design in this embodiment can facilitate the stacking design of multiple filter components 10. In addition, since the driving mechanism 101 is installed on the side wall of the shell 100, multiple filter components 10 can be driven separately, so that the speed of the variable frequency motor can be adjusted according to the filtering effect.

[0084] In this embodiment, when multiple filter assemblies 10 are stacked, they can be butted together using clamps, or corresponding step grooves or expanded holes can be provided for adaptive docking, thereby improving docking efficiency.

[0085] The filtering device in this embodiment further improves the filtering effect by adopting a stacked arrangement of multiple filter components 10. This stacked design not only increases the filtering area, but also realizes multi-stage filtration, which can remove impurity particles of different sizes and ensure that the final filtrate quality meets the standards. At the same time, the aperture design of the filter cartridge 111 and the filter plate 106 in the two adjacent filter components 10 ensures that the filtering accuracy is improved step by step, further improving the filtering effect. In addition, the controller 102 can automatically adjust the motor speed and frequency according to the filtering quality data fed back by the sensor 202, realizing intelligent filtering control. This design not only improves the filtering efficiency, but also reduces manual intervention and reduces operating costs. In summary, through multi-layer filtration and intelligent control, efficient and accurate filtration of electrolyte materials is achieved, which has significant beneficial effects.

[0086] Embodiment 3: Based on Embodiment 1 and Embodiment 2, this embodiment is further equipped with a drainage and cleaning system, including components such as a pump, a branch pipe, and a cleaning nozzle. The inlet of the pump is connected to the filtrate bin 20, and is used to extract the filtrate in the filtrate bin 20; a branch pipe is set at the outlet of the pump, one of which is used to discharge the filtrate, and the other is set with a cleaning nozzle, the nozzle facing the outer wall of the filter cartridge 111, which is used to clean the filter cartridge 111 and maintain its filtering performance. The cleaning nozzle adopts a high-pressure fan-shaped nozzle, and the range of the high-pressure cleaning liquid sprayed by the fan-shaped nozzle covers the height of the filter cartridge 111. At the same time, as the filter cartridge 111 rotates, the filter cartridge 111 can be fully cleaned.

[0087] Based on Example 1 and Example 2, this embodiment is equipped with a drainage and cleaning system 113, which further improves the practicality and maintainability of the filter device. The drainage system can conveniently discharge the filtered filtrate, and the cleaning system can efficiently clean the filter cartridge 111 to maintain its filtering performance. In particular, the cleaning nozzle uses a high-pressure fan-shaped nozzle, which can cover the height of the filter cartridge 111 and achieve comprehensive cleaning as the filter cartridge 111 rotates. This design improves the cleaning efficiency and effect. In addition, the configuration of the drainage and cleaning system also extends the service life of the filter device and reduces maintenance costs.

[0088] Example 4: This example discloses a method for filtering electrolyte materials. The filtering method of this example mainly utilizes the filtering device of any one of Examples 1 to 3 or a combination thereof, and controls the rotation speed of the drum 104 by periodic frequency conversion to achieve multi-stage filtration of the material to be filtered in the drum 104.

[0089] The filtering method comprises:

[0090] The roller 104 is driven to rotate by the driving mechanism 101;

[0091] The material to be filtered is guided to the filter plate 106 by a guide platform 105 which is arranged at the axis of the drum 104 and extends radially outward to the annular filter plate 106;

[0092] A filter plate provided at the lower part of the drum 104 and extending radially inwardly performs primary filtration on the material to be filtered; and;

[0093] The material to be filtered after the primary filtration is filtered through the filter cartridge 111 for secondary filtration; the specific steps are as follows:

[0094] S1: Start the driving mechanism 101, and the drum 104 starts to rotate under the action of the variable frequency motor. The material to be filtered enters the drum 104 from the middle of the upper part of the drum 104 and first contacts the guide platform 105. Under the action of the guide platform 105, the material to be filtered is evenly distributed to the lower end of the side wall of the drum 104.

[0095] S2: The controller 102 sets the control parameters of the periodic variable frequency motor to achieve periodic changes in the rotation speed of the drum 104. Specifically, the rotation speed gradually increases, gradually decreases, and gradually increases to meet the needs of different filtering stages.

[0096] S3: When the motor speed increases to a certain extent, the centrifugal force of the material to be filtered is greater than its own weight. At this time, under the action of centrifugal force, the material to be filtered will move upward along the slope of the drum 104, caching a portion of the material to be filtered. At the same time, the strong magnetic rod 112 on the drum 104 can absorb some of the magnetic impurities to improve the filtering effect.

[0097] S4: As the motor speed gradually decreases, when the centrifugal force of the material to be filtered is less than its own gravity, the material will move downward into the filter cartridge 111 along with the filter plate 106. Under the action of the filter plate 106, the material to be filtered undergoes primary filtration to remove larger particles of impurities.

[0098] S5: After the material to be filtered enters the filter cartridge 111, secondary filtration is performed. The filter holes on the filter cartridge 111 have a small aperture, which can further remove tiny particles of impurities. At the same time, when the material to be filtered flows along the side wall of the filter cartridge 111, it will pass through the strong magnetic rod 112 to adsorb the magnetic impurities again to ensure the filtering effect.

[0099] S6: With the periodic change of the motor speed, the material to be filtered will move up and down along the side wall of the filter cartridge 111. This up and down movement can increase the contact opportunities between the material and the filter holes and the strong magnetic rod, and at the same time, the entire side wall of the filter cartridge 111 can filter the material to be filtered evenly, thereby improving the quality and efficiency of filtration. Even if the filter holes in the filter cartridge 111 are blocked, the filtration effect can still be achieved.

[0100] S7: When there are multiple filter assemblies 10, after multiple layers of filter assemblies 10 are stacked and filtered, a highly efficient filtering effect is finally achieved. Each level of filter assembly 10 can remove impurity particles of different sizes, ensuring that the final filtrate quality meets the standard.

[0101] In addition, in the above filtering method, control can also be performed for different battery filtrate amounts.

[0102] When the amount of material to be filtered is large, the adaptability of the upper limit of the motor speed increases. At this time, under the action of centrifugal force, the material to be filtered will move upward along the slope of the drum 104, so that a part of the material to be filtered can be buffered. At the same time, the strong magnetic rod 112 on the drum 104 can absorb part of the magnetic impurities.

[0103] On the contrary, when the amount of material to be filtered is small, the upper limit of the motor speed will be adaptively reduced to achieve normal filtration of the battery filtrate.

[0104] The filtering method in this embodiment controls the drum speed by periodic frequency conversion, so that the material to be filtered experiences different centrifugal forces in the drum, thereby achieving uniform distribution and effective filtration of the material. In the stage of increasing speed, the material moves upward along the drum slope under the action of centrifugal force, caching a part of the material and increasing the contact opportunity with the filter medium; in the stage of decreasing speed, the material moves downward into the filter cartridge along the filter plate for secondary filtration. This periodic change not only improves the filtration efficiency, but also ensures the stability of the filtration quality.

[0105] At the same time, the design of multi-stage filtration components enables this method to remove impurity particles of different sizes, ensuring that the final filtrate quality meets the standards. Each level of filtration component can undertake a specific filtration task. The first level filtration removes larger impurities, and the second level filtration further removes tiny impurities. This hierarchical filtration method not only improves the filtration accuracy, but also extends the service life of the filtration device.

[0106] In addition, the method also takes into account the changes in the amount of material to be filtered, and achieves effective processing of different amounts of material by adaptively adjusting the upper limit of the motor speed. When the amount of material is large, the upper limit of the speed is increased to cache part of the material and absorb magnetic impurities; when the amount of material is small, the upper limit of the speed is reduced to achieve a normal filtering effect. This flexibility enables the method to adapt to the needs of different production scenarios and improve production efficiency and product quality.

[0107] Embodiment 5: This embodiment discloses a method for filtering electrolyte materials. The filtering method of this embodiment mainly utilizes the filtering device of any one of embodiments 1 to 3 or a combination thereof, and realizes multi-stage filtration of the material to be filtered in the drum 104 by frequency conversion control of the rotation speed of the drum 104.

[0108] The filtering method comprises:

[0109] The roller 104 is driven to rotate by the driving mechanism 101;

[0110] The material to be filtered is guided to the filter plate 106 by a guide platform 105 which is arranged at the axis of the drum 104 and extends radially outward to the annular filter plate 106;

[0111] A filter plate provided at the lower part of the drum 104 and extending radially inwardly performs primary filtration on the material to be filtered; and;

[0112] The material to be filtered after the primary filtration is filtered through the filter cartridge 111 for secondary filtration.

[0113] The specific steps include:

[0114] For secondary filtration, the speed r of the filter cartridge 111 controlled by the variable frequency motor is greater than the first threshold r 1 So that the material to be filtered is only distributed on the side wall of the filter cartridge 111. That is, there is basically no accumulation of material to be filtered at the bottom of the filter cartridge 111. It is understandable that if the material to be filtered begins to accumulate at the bottom of the filter cartridge 111, it indicates that the processing capacity of the filter cartridge 111 is lower than the liquid inflow level of the material to be filtered or too much liquid is inflowed in the early stage. The shaking of the accumulated material in the filter cartridge 111 has many uncertainties, which will impact the fixed connection of the filter cartridge 111 and even the connection between the drum 104 and the housing 100, which is not conducive to the stability and durability of the equipment.

[0115] Furthermore, the speed r of the filter cartridge 111 controlled by the variable frequency motor is less than the second threshold r 2 So that the material to be filtered covers the entire side wall of the filter cartridge 111. That is, the filtering area of ​​the side wall of the filter cartridge 111 is fully utilized.

[0116] After the material to be filtered is evenly distributed on the side wall of the filter cartridge 111, part of it will pass through the filter cartridge 111 due to gravity, and the other part will continue to flow downward and be filtered along the inclined side wall of the filter cartridge 111. After the filter cartridge 111 is driven to rotate, due to the centrifugal force, on the one hand, the material to be filtered is promoted to pass through the filter cartridge 111, and on the other hand, the material to be filtered that has not passed through the filter cartridge is inhibited from continuing to flow downward along the inclined side wall of the filter cartridge 111.

[0117] It should be noted that the first threshold r 1 , the second threshold r 2 It depends on the angle α between the normal line of the filter cartridge 111 and the vertical direction, the size of the filter holes of the filter cartridge 111, the properties of the material to be filtered and the feed level, the diameter of the filter cartridge 111, etc. It can be expected that as the filtration continues, the filter holes of the filter cartridge 111 will be partially blocked. Therefore, the first threshold r 1 , the second threshold r 2 It is not a certain fixed value, it can be estimated and determined through a mathematical model, it can also be determined based on experience, or it can be determined by monitoring the actual filtering conditions of the filter cartridge 111. These methods are easy to implement for those skilled in the art and will not be described in detail here.

[0118] Furthermore, for a specific liquid inlet level of the material to be filtered, when the rotation speed r of the filter cartridge 111 cannot be controlled to ensure that the material to be filtered is only distributed on the side wall of the filter cartridge 111 and / or cannot ensure that the material to be filtered covers the entire side wall of the filter cartridge 111, the cleaning or replacement of the filter cartridge 111 is started.

[0119] The above description is an explanation of the present invention, not a limitation of the present invention, and any form of modification may be made within the protection scope of the present invention.

Claims

1. A method for filtering an electrolyte material, which uses a filtering component (10) for filtering, characterized in that: The filtering component (10) comprises: A housing (100) which is a vertical cylindrical structure; A roller (104) is arranged along the axial direction of the shell (100) and is rotatably connected in the cavity of the shell (100); A driving mechanism (101) for driving the roller (104) to rotate; The filter plate (106) is an annular structure and is arranged to extend radially inward from the lower part of the drum (104); A flow guide platform (105) is arranged at the axis of the drum (104) and extends radially outward to the annular filter plate (106), and is used to guide the material to be filtered to the annular filter plate (106); A filter cartridge (111) is detachably fixed to the lower end of the drum (104); the filter cartridge (111) is a frustum-shaped cylindrical structure with an expanded upper end, and the filter cartridge (111) covers the filter plate (106); The filtering method comprises the following steps: S1. The guide table 105 guides the material to be filtered to the filter plate (106); S2. The filter plate (106) performs primary filtration on the material to be filtered; S3. After the primary filtration, the material to be filtered is filtered through the filter cartridge (111) under the action of centrifugal force for secondary filtration of the material to be filtered; The driving mechanism (101) drives the drum (104) to rotate, and controls the rotation speed r of the filter cartridge (111) to be greater than a first threshold value r1 so that the material to be filtered is distributed only on the side wall of the filter cartridge (111).

2. The method for filtering an electrolyte material according to claim 1, wherein: The rotation speed r of the filter cartridge (111) is controlled to be less than a second threshold value r2 so that the material to be filtered covers the entire side wall of the filter cartridge (111).

3. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: The driving mechanism (101) is a variable frequency motor.

4. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: A guide strip is arranged on the surface of the guide platform (105).

5. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: The inner wall of the filter cartridge (111) and / or the drum (104) is provided with a plurality of strong magnetic bars (112).

6. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: The angle α between the normal line of the filter cartridge (111) and the vertical direction is between 5° and 45°.

7. The method for filtering an electrolyte material according to claim 6, wherein: The inner diameter of the roller (104) decreases from top to bottom, and the angle between the inner wall of the roller (104) and the vertical direction is β, and β<α.

8. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: The filter hole diameter of the filter plate (106) is larger than the filter hole diameter of the filter cartridge (111).

9. The method for filtering an electrolyte material according to claim 8, characterized in that: The pore size of the filter holes of the filter plate (106) is between 5 and 10 microns, while the pore size of the filter holes on the filter cartridge (111) is between 0.1 and 0.5 microns.

10. The method for filtering an electrolyte material according to claim 1 or 2, characterized in that: The filter assembly (10) further comprises a filtrate bin (20) connected to the lower end of the filter assembly (10) and used for receiving the filtrate after filtration, and the lower end of the filtrate bin (20) is connected to a liquid outlet (201); The number of the filter assemblies (10) is greater than or equal to two, and the plurality of filter assemblies (10) are arranged in a stacked manner. When stacked, the liquid outlet (201) of the filtrate bin of the upper filter assembly (10) is inserted into the inner cavity of the drum (104) of the lower filter assembly (10).

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