Method for removing magnetic foreign matters from lithium battery ceramic separator powder

Abstract

The present application provides a method for removing magnetic foreign matters from lithium-ion battery ceramic separator powder. The method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder includes the following steps: obtaining a primary volume parameter of the slurry in the second flow tank; when the primary volume parameter is the same as the preset start volume parameter, sending a primary start signal to the magnetic removal central control device; obtaining a secondary volume parameter of the slurry in the third flow tank; when the secondary volume parameter is the same as the preset stop volume parameter, sending a primary stop signal to the magnetic removal central control device; obtaining the magnetic foreign matter content of the slurry in the third flow tank; when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, sending a circulation processing signal to the magnetic removal central control device. The method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder can effectively improve the removal efficiency of magnetic foreign matters from the lithium-ion battery ceramic separator powder.

Description

Technical Field

[0001] The present invention relates to the technical field of battery material processing, and particularly relates to a method for removing magnetic foreign matters from lithium-ion battery ceramic separator powder. Background Art

[0002] The core electrochemical components of a battery include a positive electrode, a negative electrode, a separator, and an electrolyte. In particular, ceramic separator powder is particularly prone to introducing magnetic foreign matters such as iron, nickel, cobalt, etc. The main sources of introduction are: inherent magnetic impurities in raw materials, wear of production equipment, environmental cross-contamination, and introduction of recycled materials, etc. And magnetic foreign matters will cause an upgrade in the safety risks of the battery, such as triggering thermal runaway, enhancing dendrite induction, and a sharp increase in gas production, etc. Thus, demagnetization of the raw materials for the core electrochemical components of the battery is a key process step. Currently, demagnetization is mostly carried out through the liquid phase, that is, the powder is demagnetized by making it into a slurry, such as the invention patent with the application number CN202310211095.0, and further through A / B tank circulating electro-demagnetization, such as the utility model patent application with the application number CN202221179898.X. However, there are the following problems with A / B tank circulating electro-demagnetization: The "Industry Specification Conditions for Lithium-Ion Battery Separators" requires that the Fe impurity be controlled <5 ppm. For the demagnetization treatment of ceramic separator powder with a relatively high content of magnetic foreign matters, multiple cycles of demagnetization in the A / B tank are required, and it is necessary to wait until all the materials in the A tank or B tank are completely demagnetized at one time before the next cycle of demagnetization can be carried out, and the demagnetization efficiency is relatively low. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for removing magnetic foreign matters from lithium-ion battery ceramic separator powder that can effectively improve the removal efficiency of magnetic foreign matters.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A method for removing magnetic foreign matters from lithium-ion battery ceramic separator powder, which is used to be executed in a device for removing magnetic foreign matters from lithium-ion battery ceramic separator powder. The device for removing magnetic foreign matters from lithium-ion battery ceramic separator powder includes two electro-demagnetizers, a first flow tank, a second flow tank, a third flow tank, and two pumps. The slurry in the first flow tank is conveyed to the corresponding electro-demagnetizer through one of the pumps and enters the second flow tank, and the slurry in the second flow tank is conveyed to the corresponding electro-demagnetizer through the other pump and enters the third flow tank;

[0006] The method for removing magnetic foreign matters from lithium-ion battery ceramic separator powder includes the following steps:

[0007] Turn on the pump corresponding to the first flow tank and the electro-demagnetizer;

[0008] Obtain the primary volume parameter of the slurry in the second flow tank;

[0009] Detect whether the primary volume parameter is the same as the preset start volume parameter;

[0010] When the primary volume parameter is the same as the preset start volume parameter, send a primary start signal to the magnetic removal central control device to start the pump body and the electromagnetic separator corresponding to the second flow tank;

[0011] Obtain the secondary volume parameter of the slurry in the third flow tank;

[0012] Detect whether the secondary volume parameter is the same as the preset stop volume parameter;

[0013] When the secondary volume parameter is the same as the preset stop volume parameter, send a primary stop signal to the magnetic removal central control device to stop the pump body and the electromagnetic separator corresponding to the first flow tank;

[0014] Obtain the magnetic foreign matter content of the slurry in the third flow tank;

[0015] Detect whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content;

[0016] When the magnetic foreign matter content is greater than the preset magnetic foreign matter content, send a circulation processing signal to the magnetic removal central control device to input the slurry in the third flow tank into the first flow tank.

[0017] In one embodiment, starting the pump body and the electromagnetic separator corresponding to the first flow tank includes:

[0018] Obtain the core energy efficiency parameters of each pump body, where the core energy efficiency parameters include shaft power, pump efficiency, and head;

[0019] Perform pump type conversion processing on the core energy efficiency parameters to obtain a pump type conversion value;

[0020] Detect whether the pump type conversion value matches the preset conversion value;

[0021] When the pump type conversion value matches the preset conversion value, obtain the demagnetization working current of the corresponding electromagnetic separator;

[0022] Perform magnetic induction conversion processing on the demagnetization working current to obtain a magnetic induction conversion value;

[0023] Detect whether the magnetic induction conversion value matches the preset magnetic induction conversion value;

[0024] When the magnetic induction conversion value matches the preset magnetic induction conversion value, send a secondary opening signal to the demagnetization central control device to turn on the pump body and the electromagnetic demagnetizer corresponding to the first flow tank;

[0025] Among them, the pump type conversion process satisfies the following formula:

[0026] ;

[0027] P is the shaft power, unit is KW, η is the efficiency of the pump, unit is %, H is the head, unit is m;

[0028] The magnetic induction conversion process satisfies the following formula:

[0029] ;

[0030] μ is the vacuum permeability, unit is 1; n is the number of turns of the exciting coil; I is the current, unit is A, S is the effective area of the magnetic flux, unit is m 2 ; θ is the angle between the magnetic field direction and the effective section, θ 1 、θ 2 are respectively the angles between the magnetic field direction and two orthogonal axes.

[0031] In one embodiment, the pump type conversion process satisfies the following formula:

[0032] .

[0033] In one embodiment, when the primary volume parameter is the same as the preset start volume parameter, send a primary opening signal to the demagnetization central control device, and then it further includes:

[0034] Obtain the primary magnetic foreign object adsorption parameter of the electromagnetic demagnetizer corresponding to the first flow tank;

[0035] Detect whether the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter;

[0036] When the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, send a primary closing signal to the demagnetization central control device to turn off the pump body and the electromagnetic demagnetizer corresponding to the first flow tank, and perform magnetic foreign object flushing on the corresponding electromagnetic demagnetizer;

[0037] And, when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, send a primary closing signal to the demagnetization central control device, and then it further includes:

[0038] Obtain the magnetic foreign object content of the slurry in the third flow tank;

[0039] Detect whether the content of the magnetic foreign matter is less than or equal to a preset content of magnetic foreign matter;

[0040] When the content of the magnetic foreign matter is greater than the preset content of magnetic foreign matter, send a circulation processing signal to the magnetic removal central control device so that the slurry in the third flow tank is input into the first flow tank.

[0041] In one embodiment, when the primary volume parameter is the same as the preset start volume parameter, send a primary start signal to the magnetic removal central control device, and then further include:

[0042] Obtain the secondary magnetic foreign matter adsorption parameter of the electromagnetic separator corresponding to the second flow tank;

[0043] Detect whether the secondary magnetic foreign matter adsorption parameter is greater than or equal to a preset magnetic foreign matter adsorption saturation parameter;

[0044] When the secondary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, send a secondary shutdown signal to the magnetic removal central control device to close the pump body and the electromagnetic separator corresponding to the second flow tank, and perform magnetic foreign matter flushing on the corresponding electromagnetic separator;

[0045] And when the secondary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, send a secondary shutdown signal to the magnetic removal central control device, and then further include:

[0046] Obtain the content of the magnetic foreign matter in the slurry in the third flow tank;

[0047] Detect whether the content of the magnetic foreign matter is less than or equal to a preset content of magnetic foreign matter;

[0048] When the content of the magnetic foreign matter is greater than the preset content of magnetic foreign matter, send a circulation processing signal to the magnetic removal central control device so that the slurry in the third flow tank is input into the second flow tank.

[0049] In one embodiment, detect whether the content of the magnetic foreign matter is less than or equal to a preset content of magnetic foreign matter;

[0050] When the content of the magnetic foreign matter is less than or equal to the preset content of magnetic foreign matter, send a qualified output processing signal to the magnetic removal central control device so that the slurry in the third flow tank is output outside the third flow tank.

[0051] In one embodiment, when the content of the magnetic foreign matter is greater than the preset content of magnetic foreign matter, send a circulation processing signal to the magnetic removal central control device, and then further include:

[0052] Obtain the circulating stirring duration parameter of the first flow tank;

[0053] Detect whether the circulating stirring duration parameter is greater than or equal to the preset circulating stirring duration parameter;

[0054] When the circulating stirring duration parameter is greater than or equal to the preset circulating stirring duration, send a secondary opening signal to the demagnetization central control device to open the pump body and the electromagnetic demagnetizer corresponding to the first flow tank.

[0055] In one embodiment, the device for removing magnetic foreign matters from the lithium ceramic diaphragm powder also includes a demagnetization central control device,

[0056] The demagnetization central control device includes:

[0057] A data acquisition module, which is used to obtain the primary volume parameter of the slurry in the second flow tank, the secondary volume parameter of the slurry in the third flow tank, and the content of magnetic foreign matters in the slurry in the third flow tank;

[0058] An opening and closing module, which is used to open or close the corresponding electromagnetic demagnetizer and pump body according to the primary opening signal and the primary closing signal.

[0059] In one embodiment, the volume of the second flow tank is smaller than the volumes of the first flow tank and the third flow tank, and the volume of the second flow tank ≥ 0.02m 3 .

[0060] In one embodiment, stirring blades are arranged in the first flow tank, and the stirring blades are used to stir and mix the slurry in the first flow tank.

[0061] In one embodiment, the first flow tank is communicated with the third flow tank through a delivery pump.

[0062] Compared with the prior art, the present invention has at least the following advantages: The method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder of the present invention is used in a device for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder, which has two pump bodies and two demagnetizers, and the slurry in the first flow tank is conveyed to the corresponding electromagnetic demagnetizer through one of the pump bodies and enters the second flow tank. The slurry in the second flow tank is conveyed to the corresponding electromagnetic demagnetizer through the other pump body and enters the third flow tank to control the flow rate of the slurry passing through any electromagnetic demagnetizer. When the pump body and the electromagnetic demagnetizer corresponding to the first flow tank are turned on, by collecting the primary volume parameter of the slurry in the second flow tank, it is controlled that there is still a surplus after the slurry in the second flow tank is pumped into the electromagnetic demagnetizer through the corresponding pump body and enters the third flow tank, that is, the opening time of the pump body and the electromagnetic demagnetizer corresponding to the second flow tank is controlled. On the basis of ensuring the demagnetization efficiency of the electro-ceramic separator powder, the energy consumption is reduced. Further, by collecting the secondary volume parameter of the slurry in the third flow tank, the closing time of the pump body and the electromagnetic demagnetizer corresponding to the first flow tank is controlled to maximize the running time of the pump body and the electromagnetic demagnetizer corresponding to the first flow tank. At this time, in cooperation with collecting the content of magnetic foreign matters in the slurry in the third flow tank, the time when the electromagnetic demagnetizer corresponding to the first flow tank stops exciting and completes the flushing stage is maximally utilized, and the demagnetization efficiency of the lithium-ion battery ceramic separator powder is preferably improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0064] Figure 1 It is a schematic structural diagram of a device for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder according to an embodiment of the present invention; Figure 2 It is a flowchart of a method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0066] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of this invention herein are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0068] This application provides a method for removing magnetic foreign objects from lithium-ion battery ceramic separator powder, which is used to be executed in a device for removing magnetic foreign objects from lithium-ion battery ceramic separator powder.

[0069] Please refer to Figure 1 , a device 10 for removing magnetic foreign objects from lithium-ion battery ceramic separator powder according to an embodiment includes two electromagnetic demagnetizers 101, a first flow tank 102, a second flow tank 103, a third flow tank 104 and two pumps 105. The first flow tank 102 is used to store the slurry of lithium-ion battery ceramic separator powder. The slurry is transmitted from the first flow tank 102 to one of the electromagnetic demagnetizers 101 and enters the second flow tank 103. The slurry is transmitted from the second flow tank 103 to the other electromagnetic demagnetizer 101 and enters the third flow tank 104. The third flow tank 104 is communicated with the first flow tank 102. The slurry in the first flow tank 102 is transmitted to the corresponding electromagnetic demagnetizer 101 through one of the pumps 105 and enters the second flow tank 103. The slurry in the second flow tank 103 is transmitted to the corresponding electromagnetic demagnetizer 101 through the other pump 105 and enters the third flow tank 104 to control the flow rate of the slurry through any one of the electromagnetic demagnetizers 101.

[0070] In one embodiment, the volume of the second flow tank is smaller than the volumes of the first flow tank and the third flow tank, and the volume of the second flow tank ≥ 0.02 m 3 .

[0071] It can be understood that the first flow tank and the third flow tank are the main positions for storing the slurry. Therefore, in order to better ensure the demagnetization efficiency of the lithium-ion ceramic separator powder, it is necessary to set the volumes of the first flow tank and the second flow tank to be relatively large. On the basis of ensuring the demagnetization efficiency, it is difficult to miniaturize their volumes. The second flow tank is a transfer tank, mainly used for temporarily storing the slurry during the demagnetization process, so that the design of the second flow tank can be miniaturized in volume. In this way, the occupied area of the device for removing magnetic foreign objects from the lithium-ion ceramic separator powder is effectively reduced.

[0072] In one embodiment, the first flow tank is connected to the third flow tank through a delivery pump. Further, stirring blades are provided in the first flow tank. It can be understood that when the first flow tank and the third flow tank are connected, when there is a relatively large amount of slurry stored in the third flow tank, if it is detected that the content of magnetic foreign objects in the slurry in the third flow tank meets the standard, the slurry in the third flow tank can effectively return to the first flow tank for further demagnetization treatment. Further, the stirring blades are used to stir and mix the slurry in the first flow tank. The function of the stirring blades is to stir and mix the slurry in the first flow tank, thereby ensuring the overall uniformity of the slurry in the first flow tank. In this way, the uniformity of the slurry reaching the first flow tank after further demagnetization is better ensured, and thus the demagnetization effect of the lithium-ion ceramic separator powder is better ensured.

[0073] In one embodiment, the second flow tank is connected to the third flow tank through another delivery pump. Further, stirring blades are provided in the second flow tank, which better ensures the uniformity of the slurry reaching the second flow tank after further demagnetization, and thus better ensures the demagnetization effect of the lithium-ion ceramic separator powder.

[0074] Please refer to Figure 1 , in one embodiment, the device 10 for removing magnetic foreign objects from the lithium-ion ceramic separator powder further includes a demagnetization central control device 106. Further, the demagnetization central control device includes a data acquisition module and an opening / closing module. The data acquisition module is used to obtain the primary volume parameter of the slurry in the second flow tank, the secondary volume parameter of the slurry in the third flow tank, and the content of magnetic foreign objects in the slurry in the third flow tank. The opening / closing module is used to open or close the corresponding electromagnetic demagnetizer and pump body according to the primary opening signal and the primary closing signal.

[0075] The method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder described above includes the following steps: Turn on the pump body and the electromagnetic separator corresponding to the first flow tank, so that the slurry in the first flow tank is pumped into the corresponding electromagnetic separator through the corresponding pump body and enters the second flow tank; Obtain the primary volume parameter of the slurry in the second flow tank; Detect whether the primary volume parameter is the same as the preset start volume parameter; When the primary volume parameter is the same as the preset start volume parameter, send a primary start signal to the demagnetization central control device to turn on the pump body and the electromagnetic separator corresponding to the second flow tank, and the slurry in the second flow tank is pumped into the corresponding electromagnetic separator through the corresponding pump body and enters the third flow tank; And when the primary volume parameter is the same as the preset start volume parameter, after sending a primary start signal to the demagnetization central control device, it further includes: Obtain the secondary volume parameter of the slurry in the third flow tank; Detect whether the secondary volume parameter is the same as the preset stop volume parameter; When the secondary volume parameter is the same as the preset stop volume parameter, send a primary shutdown signal to the demagnetization central control device to turn off the pump body and the electromagnetic separator corresponding to the first flow tank; And when the secondary volume parameter is the same as the preset stop volume parameter, after sending a primary shutdown signal to the demagnetization central control device, it further includes: Obtain the magnetic foreign matter content of the slurry in the third flow tank; Detect whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content; When the magnetic foreign matter content is greater than the preset magnetic foreign matter content, send a circulation processing signal to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

[0076] The method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder described above is used in a device for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder, which has two pump bodies and two electromagnetic separators, and the slurry in the first flow tank is transmitted to the corresponding electromagnetic separator through one pump body and enters the second flow tank, and the slurry in the second flow tank is transmitted to the corresponding electromagnetic separator through the other pump body and enters the third flow tank to control the flow rate of the slurry through any electromagnetic separator. By turning on the pump body and the electromagnetic separator corresponding to the first flow tank, through the acquisition of the primary volume parameter of the slurry in the second flow tank, it is controlled that there is still a surplus after the slurry in the second flow tank is pumped into the electromagnetic separator through the corresponding pump body and enters the third flow tank, that is, the opening time of the pump body and the electromagnetic separator corresponding to the second flow tank is controlled. On the basis of ensuring the demagnetization efficiency of the electro-ceramic separator powder, the energy consumption is reduced. Further, through the acquisition of the secondary volume parameter of the slurry in the third flow tank, the closing time of the pump body and the electromagnetic separator corresponding to the first flow tank is controlled, maximizing the running time of the pump body and the electromagnetic separator corresponding to the first flow tank. At this time, combined with the acquisition of the magnetic foreign matter content of the slurry in the third flow tank, the time when the electromagnetic separator corresponding to the first flow tank stops exciting and completes the flushing stage is utilized to the maximum extent, and the demagnetization efficiency of the lithium-ion battery ceramic separator powder is preferably improved.

[0077] To better understand the method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder of the present application, the following further explains the method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder of the present application:

[0078] Please refer to Figure 2 , the method for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder in one embodiment includes the following steps:

[0079] S100. Turn on the pump body and the electromagnetic separator corresponding to the first flow tank, so that the slurry in the first flow tank is pumped into the corresponding electromagnetic separator through the corresponding pump body and enters the second flow tank.

[0080] It can be understood that the pump body pumps the slurry stored in the first flow tank into the electromagnetic separator, and then through the electromagnetic separator, at this time demagnetization is carried out, and it enters the second flow tank.

[0081] S200. Obtain the primary volume parameter of the slurry in the second flow tank.

[0082] It can be understood that when the slurry in the first flow tank is demagnetized in the corresponding electromagnetic separator, at this time the slurry in the second flow tank will increase with time. Further, the primary volume parameter of the slurry in the second flow tank is the volume of the slurry carried in the second flow tank. Through the acquisition of the primary volume parameter of the slurry in the second flow tank, it is convenient to determine whether there is any surplus after the slurry in the second flow tank is pumped into the electromagnetic separator through the pump body in real time and enters the third flow tank after the pump body corresponding to the second flow tank is turned on, thereby ensuring that the flow rate of the slurry through the electromagnetic separator remains consistent, and on the basis of ensuring the demagnetization efficiency of the lithium-ion battery ceramic separator powder, the energy consumption is reduced.

[0083] S300. Detect whether the primary volume parameter is the same as the preset start volume parameter.

[0084] It can be understood that the preset start volume parameter is the volume actually measured according to the volume of the second flow tank and the pump-out flow rate of the pump for the slurry during the operation of the equipment, that is, to control that there is still surplus after the slurry in the second flow tank is pumped into the electromagnetic separator through the pump body and enters the third flow tank, and it is the standard volume data determined after each structure in the device for removing magnetic foreign matters from the lithium-ion battery ceramic separator powder. By comparing the primary volume parameter with the preset start volume parameter, it is possible to better determine the judgment of turning on the pump body and the electromagnetic separator corresponding to the second flow tank.

[0085] S400. When the primary volume parameter is the same as the preset start volume parameter, send a primary opening signal to the demagnetization central control device to turn on the pump body and the electromagnetic separator corresponding to the second flow tank, and the slurry in the second flow tank is pumped into the corresponding electromagnetic separator through the corresponding pump body and enters the third flow tank.

[0086] It can be understood that when the primary volume parameter is the same as the preset start volume parameter, that is, there is still a surplus after the lithium-ion ceramic separator powder is pumped into the electromagnetic separator in real time through the pump body and enters the third flow tank. At this time, the pump body and electromagnetic separator corresponding to the second flow tank are turned on, which can better reduce energy consumption on the basis of ensuring the demagnetization efficiency of the lithium-ion ceramic separator powder.

[0087] Moreover, when the primary volume parameter is the same as the preset start volume parameter, a primary start signal is sent to the demagnetization central control device. After that, it further includes:

[0088] S500. Obtain the secondary volume parameter of the slurry in the third flow tank.

[0089] It can be understood that the secondary volume parameter of the slurry in the third flow tank is the volume of the slurry in the third flow tank. By collecting the secondary volume parameter of the slurry in the third flow tank, it is convenient to determine whether the slurry in the third flow tank is saturated, so as to judge whether the slurry in the third flow tank has reached the maximum value of the capacity of the third flow tank, that is, to delay the cyclic treatment of the slurry in the third flow tank to the greatest extent. It can be understood that if the storage amount of the slurry in the third flow tank has not reached the difference between the volume of the third flow tank and the volume of the second flow tank, and the pump body and electromagnetic separator corresponding to the first flow tank are closed, the actual total working time of the pump body and electromagnetic separator corresponding to the first flow tank is reduced, which has a greater impact on the demagnetization efficiency of the lithium-ion ceramic separator powder.

[0090] S600. Detect whether the secondary volume parameter is the same as the preset stop volume parameter.

[0091] It can be understood that the preset stop volume parameter is the difference between the volume of the third flow tank and the volume of the second flow tank, that is, the standard volume data determined after each structure in the device for removing magnetic foreign matters of the lithium-ion ceramic separator powder. By comparing the secondary volume parameter with the preset stop volume parameter, it can better determine the judgment of turning on the pump body and electromagnetic separator corresponding to the first flow tank, and better ensure the demagnetization efficiency of the lithium-ion ceramic separator powder.

[0092] S700. When the secondary volume parameter is the same as the preset stop volume parameter, send a primary close signal to the demagnetization central control device to close the pump body and electromagnetic separator corresponding to the first flow tank.

[0093] It can be understood that when the secondary volume parameter is the same as the preset stop volume parameter, that is, the volume of the slurry in the third flow tank has reached the difference between the volume of the third flow tank and the volume of the second flow tank. At this time, the pump body and electromagnetic separator corresponding to the first flow tank are closed, which can better ensure the demagnetization efficiency of the lithium-ion ceramic separator powder.

[0094] And when the secondary volume parameter is the same as the preset stop volume parameter, a primary shutdown signal is sent to the demagnetization central control device. After that, it further includes:

[0095] S800. Obtain the magnetic foreign matter content of the slurry in the third flow tank.

[0096] It can be understood that the content of magnetic foreign matter is the actual content of magnetic foreign matter in the slurry. By collecting the actual content of magnetic foreign matter in the slurry, it is convenient to determine whether the magnetic foreign matter content of the slurry in the third flow tank meets the standard, and it is convenient to judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment. Since when the slurry in the third flow tank circulates to the first flow tank, in order to ensure the uniformity of the slurry in the first flow tank, it is necessary to close the pump body and the electromagnetic demagnetizer corresponding to the first flow tank, and then carry out the operation when there is the maximum stock of slurry in the third flow tank. At this time, the time when the electromagnetic demagnetizer corresponding to the first flow tank stops exciting and completes the flushing stage is maximally utilized, which is beneficial to improving the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0097] S900. Detect whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content.

[0098] It can be understood that the preset magnetic foreign matter content is the control content of the ceramic separator powder in the lithium-ion battery industry, that is, the preset magnetic foreign matter content is the standard value of the ceramic separator powder in the lithium-ion battery industry. By judging whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, it is beneficial to judge whether the slurry in the third flow tank meets the lithium-ion battery industry standard, and quickly judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment.

[0099] S1000. When the magnetic foreign matter content is greater than the preset magnetic foreign matter content, send a circulation processing signal to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

[0100] It can be understood that when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, at this time, the pump body and the electromagnetic demagnetizer corresponding to the first flow tank are already in the closed state. At this time, judging whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment can better improve the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0101] Execute in the above-mentioned device for removing magnetic foreign matters from lithium-ion battery ceramic separator powder, which has two pump bodies and two demagnetizers, and the slurry in the first flow tank is conveyed to the corresponding electromagnetic demagnetizer through one pump body and enters the second flow tank. The slurry in the second flow tank is conveyed to the corresponding electromagnetic demagnetizer through the other pump body and enters the third flow tank to control the flow rate of the slurry through any electromagnetic demagnetizer. Turn on the pump body and electromagnetic demagnetizer corresponding to the first flow tank. By collecting the primary volume parameter of the slurry in the second flow tank, control the remaining amount of the slurry in the second flow tank after being pumped into the electromagnetic demagnetizer through the corresponding pump body and entering the third flow tank, that is, control the opening time of the pump body and electromagnetic demagnetizer corresponding to the second flow tank. On the basis of ensuring the demagnetization efficiency of the electro-ceramic separator powder, the energy consumption is reduced. Further, by collecting the secondary volume parameter of the slurry in the third flow tank, control the closing time of the pump body and electromagnetic demagnetizer corresponding to the first flow tank to maximize the running time of the pump body and electromagnetic demagnetizer corresponding to the first flow tank. At this time, combined with collecting the content of magnetic foreign matters in the slurry in the third flow tank, the time when the electromagnetic demagnetizer corresponding to the first flow tank stops exciting and completes the flushing stage is utilized to the maximum extent, and the demagnetization efficiency of the lithium-ion battery ceramic separator powder is better improved.

[0102] In one embodiment, when the primary volume parameter is the same as the preset start volume parameter, send a primary opening signal to the demagnetization central control device, and then it further includes:

[0103] Obtain the primary magnetic foreign matter adsorption parameter of the electromagnetic demagnetizer corresponding to the first flow tank.

[0104] It can be understood that the primary magnetic foreign matter adsorption parameter is the amount of magnetic foreign matters adsorbed in the electromagnetic demagnetizer corresponding to the first flow tank. By collecting the primary magnetic foreign matter adsorption parameter of the electromagnetic demagnetizer corresponding to the first flow tank, it is convenient to determine whether the magnetic foreign matters in the electromagnetic demagnetizer corresponding to the first flow tank reach the maximum amount, so as to determine whether to stop the excitation of the electromagnetic demagnetizer corresponding to the first flow tank and timely flush and remove the magnetic foreign matters in the electromagnetic demagnetizer.

[0105] Further, detect whether the primary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter.

[0106] It can be understood that the preset magnetic foreign matter adsorption saturation parameter is the maximum magnetic foreign matter adsorption amount of the electromagnetic demagnetizer corresponding to the first flow tank. By detecting whether the primary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, it is convenient to determine whether to stop the excitation of the electromagnetic demagnetizer corresponding to the first flow tank and timely flush and remove the magnetic foreign matters in the electromagnetic demagnetizer, which better ensures the demagnetization effectiveness of the lithium-ion battery ceramic separator powder.

[0107] Further, when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, a primary shutdown signal is sent to the demagnetization central control device to shut down the pump body and the electromagnetic demagnetizer corresponding to the first flow tank, and the electromagnetic demagnetizer is flushed with magnetic foreign objects.

[0108] It can be understood that when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, that is, the adsorption amount of magnetic foreign objects in the electromagnetic demagnetizer corresponding to the first flow tank has reached the maximum magnetic foreign object adsorption amount. After determining that the adsorption amount of magnetic foreign objects in the electromagnetic demagnetizer has reached the maximum magnetic foreign object adsorption amount, it is necessary to stop exciting the magnetic field to ensure the demagnetization effectiveness of the lithium-ion battery ceramic separator powder.

[0109] In addition, when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter and a primary shutdown signal is sent to the demagnetization central control device, the following steps are also included:

[0110] Obtain the magnetic foreign object content of the slurry in the third flow tank.

[0111] It can be understood that the content of magnetic foreign objects is the actual content of magnetic foreign objects in the slurry. By collecting the actual content of magnetic foreign objects in the slurry, it is convenient to determine whether the magnetic foreign object content of the slurry in the third flow tank meets the standard, and it is convenient to judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment. Since the slurry in the third flow tank is circulated to the first flow tank, in order to ensure the uniformity of the slurry in the first flow tank, it is necessary to shut down the pump body and the electromagnetic demagnetizer corresponding to the first flow tank. After the magnetic foreign objects are adsorbed and saturated in the electromagnetic demagnetizer corresponding to the first flow tank, the time for the electromagnetic demagnetizer corresponding to the first flow tank to stop exciting the magnetic field and complete the flushing stage is maximally utilized at this time, which is beneficial to improving the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0112] Further, detect whether the magnetic foreign object content is less than or equal to the preset magnetic foreign object content.

[0113] It can be understood that the preset magnetic foreign object content is the control content of the ceramic separator powder in the lithium-ion battery industry, that is, the preset magnetic foreign object content is the standard value of the ceramic separator powder in the lithium-ion battery industry. By judging whether the magnetic foreign object content is less than or equal to the preset magnetic foreign object content, it is beneficial to judge whether the slurry in the third flow tank meets the lithium-ion battery industry standard and quickly judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment.

[0114] Further, when the magnetic foreign object content is greater than the preset magnetic foreign object content, a cyclic treatment signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

[0115] It can be understood that when the content of magnetic foreign matters is greater than the preset content of magnetic foreign matters, at this time, the pump body and the electromagnetic separator corresponding to the first flow tank are already in the closed state. At this time, it is determined whether the slurry in the third flow tank is subjected to circulating demagnetization treatment, which preferably improves the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0116] It can be understood that by enabling the A / B tank to circulate, and then maximizing the use of the time in the excitation stop stage of the electromagnetic separator for circulation, the demagnetization efficiency of the lithium-ion battery ceramic separator powder is also improved. However, only one electromagnetic separator is used for demagnetization, resulting in demagnetization being only carried out by this electromagnetic separator. Although circulation treatment is carried out, the final result is the same as the conventional A / B tank circulation demagnetization efficiency. By increasing the number of electromagnetic separators, the subsequent electromagnetic separator for sequential demagnetization performs demagnetization synchronously and does not interfere with each other, improving the demagnetization efficiency of the lithium-ion battery ceramic separator powder. And by cooperating with the method for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder in the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder, it effectively realizes the miniaturization of the volumes of the second flow tank and the third flow tank while ensuring the demagnetization efficiency of the lithium-ion battery ceramic separator powder, thereby reducing the occupied area of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder and improving the universality of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder.

[0117] It can also be understood that if the number of electromagnetic separators is too large, such as more than two, then the subsequent two electromagnetic separators for sequential demagnetization and the supporting structures greatly increase the occupied area of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder, affecting the application of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder in locations with limited site area. And the demagnetization efficiency of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder more depends on the demagnetization efficiency of the electromagnetic separator at the front of the sequence. Even if the number of electromagnetic separators is increased, the demagnetization effect is still limited. That is, the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder in this application, when cooperating with the method for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder, preferably ensures the reduction of the occupied area of the device for removing magnetic foreign matters of the lithium-ion battery ceramic separator powder on the basis of ensuring the removal efficiency of the magnetic foreign matters of the lithium-ion battery ceramic separator powder.

[0118] In one embodiment, when the primary volume parameter is the same as the preset start volume parameter, a primary opening signal is sent to the demagnetization central control device, and then it further includes:

[0119] Obtain the secondary magnetic foreign matter adsorption parameter of the electromagnetic separator corresponding to the second flow tank.

[0120] It can be understood that the secondary magnetic foreign object adsorption parameter is the amount of magnetic foreign objects adsorbed in the electromagnetic separator corresponding to the second flow tank. By collecting the secondary magnetic foreign object adsorption parameter of the electromagnetic separator corresponding to the second flow tank, it is convenient to determine whether the amount of magnetic foreign objects in the electromagnetic separator corresponding to the second flow tank has reached the maximum amount, so as to determine whether to stop the excitation of the electromagnetic separator corresponding to the second flow tank and flush and remove the magnetic foreign objects in the electromagnetic separator in a timely manner.

[0121] Further, it is detected whether the secondary magnetic foreign object adsorption parameter is greater than or equal to a preset magnetic foreign object adsorption saturation parameter.

[0122] It can be understood that the preset magnetic foreign object adsorption saturation parameter is the maximum magnetic foreign object adsorption amount of the electromagnetic separator corresponding to the second flow tank. By detecting whether the secondary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, it is convenient to determine whether to stop the excitation of the electromagnetic separator corresponding to the second flow tank and flush and remove the magnetic foreign objects in the electromagnetic separator in a timely manner, which better ensures the demagnetization effectiveness of the lithium battery ceramic separator powder.

[0123] Further, when the secondary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, a secondary shutdown signal is sent to the demagnetization central control device to close the pump body and the electromagnetic separator corresponding to the second flow tank, and the corresponding electromagnetic separator is flushed with magnetic foreign objects.

[0124] It can be understood that when the secondary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, that is, the adsorption amount of magnetic foreign objects in the electromagnetic separator corresponding to the second flow tank has reached the maximum magnetic foreign object adsorption amount. After determining that the adsorption amount of magnetic foreign objects in the electromagnetic separator has reached the maximum magnetic foreign object adsorption amount, it is necessary to stop the excitation to ensure the demagnetization effectiveness of the lithium battery ceramic separator powder.

[0125] And when the secondary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, a secondary shutdown signal is sent to the demagnetization central control device. After that, it further includes:

[0126] Obtain the magnetic foreign object content of the slurry in the third flow tank.

[0127] It can be understood that the content of magnetic foreign matters is the actual content of magnetic foreign matters in the slurry. By collecting the actual content of magnetic foreign matters in the slurry, it is convenient to determine whether the content of magnetic foreign matters in the slurry in the third flow tank meets the standard, and to judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment. Since the slurry in the third flow tank is circulated to the second flow tank, in order to ensure the uniformity of the slurry in the second flow tank, it is necessary to close the pump body and the electromagnetic demagnetizer corresponding to the second flow tank. As a result, when the magnetic foreign matters are adsorbed and saturated in the electromagnetic demagnetizer corresponding to the second flow tank, the time when the electromagnetic demagnetizer corresponding to the second flow tank stops exciting and completes the flushing stage is maximally utilized at this time. And because the demagnetization efficiency of the electromagnetic demagnetizer corresponding to the first flow tank has the greatest impact on the demagnetization efficiency of the lithium battery ceramic separator powder, therefore, the electromagnetic demagnetizer corresponding to the second flow tank further reduces the content of magnetic foreign matters in the slurry circulated to the first flow tank, which is conducive to improving the demagnetization efficiency of the lithium battery ceramic separator powder.

[0128] Further, it is detected whether the content of magnetic foreign matters is less than or equal to a preset content of magnetic foreign matters.

[0129] It can be understood that the preset content of magnetic foreign matters is the control content of the ceramic separator powder in the lithium battery industry, that is, the preset content of magnetic foreign matters is the standard value of the ceramic separator powder in the lithium battery industry. By judging whether the content of magnetic foreign matters is less than or equal to the preset content of magnetic foreign matters, it is beneficial to judge whether the slurry in the third flow tank meets the lithium battery industry standard, and quickly judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment.

[0130] Further, when the content of magnetic foreign matters is greater than the preset content of magnetic foreign matters, a cyclic treatment signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the second flow tank.

[0131] It can be understood that when the content of magnetic foreign matters is greater than the preset content of magnetic foreign matters, at this time, the pump body and the electromagnetic demagnetizer corresponding to the second flow tank are already in the closed state. At this time, it is judged whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment, which preferably improves the demagnetization efficiency of the lithium battery ceramic separator powder.

[0132] Further, when the content of magnetic foreign matters is greater than the preset content of magnetic foreign matters, a cyclic treatment signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the second flow tank. After that, it further includes:

[0133] Obtain the primary magnetic foreign matter adsorption parameter of the electromagnetic demagnetizer corresponding to the first flow tank.

[0134] It can be understood that the primary magnetic foreign object adsorption parameter is the amount of magnetic foreign objects adsorbed in the electromagnetic separator corresponding to the first flow tank. By collecting the primary magnetic foreign object adsorption parameter of the electromagnetic separator corresponding to the first flow tank, it is convenient to determine whether the magnetic foreign objects in the electromagnetic separator corresponding to the first flow tank reach the maximum amount, so as to determine whether to stop the excitation of the electromagnetic separator corresponding to the first flow tank, and to flush and remove the magnetic foreign objects in the electromagnetic separator in a timely manner. At this time, the slurry in the third flow tank is directly circulated and input to the first flow tank, which better realizes the demagnetization effect of the lithium-ion battery ceramic separator powder and better improves the demagnetization of the lithium-ion battery ceramic separator powder.

[0135] Further, it is detected whether the primary magnetic foreign object adsorption parameter is greater than or equal to a preset magnetic foreign object adsorption saturation parameter.

[0136] It can be understood that the preset magnetic foreign object adsorption saturation parameter is the maximum magnetic foreign object adsorption amount of the electromagnetic separator corresponding to the first flow tank. By detecting whether the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, it is convenient to determine whether to stop the excitation of the electromagnetic separator corresponding to the first flow tank, and to flush and remove the magnetic foreign objects in the electromagnetic separator in a timely manner, which better ensures the demagnetization effectiveness of the lithium-ion battery ceramic separator powder.

[0137] Further, when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, a primary shutdown signal is sent to the demagnetization central control device to close the pump body and the electromagnetic separator corresponding to the first flow tank, and to flush the magnetic foreign objects in the corresponding electromagnetic separator.

[0138] It can be understood that when the primary magnetic foreign object adsorption parameter is greater than or equal to the preset magnetic foreign object adsorption saturation parameter, that is, the adsorption amount of magnetic foreign objects in the electromagnetic separator corresponding to the first flow tank has reached the maximum magnetic foreign object adsorption amount. After determining that the adsorption amount of magnetic foreign objects in the electromagnetic separator has reached the maximum magnetic foreign object adsorption amount, it is necessary to stop the excitation to ensure the demagnetization effectiveness of the lithium-ion battery ceramic separator powder.

[0139] In one embodiment, it is detected whether the content of magnetic foreign objects is less than or equal to a preset content of magnetic foreign objects;

[0140] When the content of magnetic foreign objects is less than or equal to the preset content of magnetic foreign objects, a qualified output processing signal is sent to the demagnetization central control device to output the slurry in the third flow tank outside the third flow tank.

[0141] It can be understood that the content of magnetic foreign matters is the actual content of magnetic foreign matters in the slurry. By collecting the actual content of magnetic foreign matters in the slurry, it is convenient to determine whether the content of magnetic foreign matters in the slurry in the third flow tank meets the standard, and to judge whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment; the preset content of magnetic foreign matters is the control content of the ceramic separator powder in the lithium battery industry, that is, the preset content of magnetic foreign matters is the standard value of the ceramic separator powder in the lithium battery industry. By determining whether the content of magnetic foreign matters is less than or equal to the preset content of magnetic foreign matters, it is beneficial to determine whether the slurry in the third flow tank meets the lithium battery industry standard, and quickly determine whether the slurry in the third flow tank needs to be subjected to cyclic demagnetization treatment; when the content of magnetic foreign matters is less than or equal to the preset content of magnetic foreign matters, at this time, the slurry in the third flow tank meets the lithium battery industry standard, that is, the demagnetization is completed, and then the slurry in the third flow tank is output outside the third flow tank, and the cyclic demagnetization of the slurry in the third flow tank is ended. In one embodiment, when the content of magnetic foreign matters is greater than the preset content of magnetic foreign matters, a cyclic processing signal is sent to the demagnetization central control device, and then the following steps are further included:

[0142] Obtain the cyclic stirring duration parameter of the first flow tank;

[0143] Detect whether the cyclic stirring duration parameter is greater than or equal to the preset cyclic stirring duration parameter;

[0144] When the cyclic stirring duration parameter is greater than or equal to the preset cyclic stirring duration, a secondary opening signal is sent to the demagnetization central control device to open the pump body and the electromagnetic demagnetizer corresponding to the first flow tank.

[0145] It can be understood that the cyclic stirring duration parameter is the time for mixing and stirring after all the slurry in the third flow tank is input into the first flow tank. By collecting the cyclic stirring duration parameter of the first flow tank, it is convenient to determine whether the slurry in the first flow tank is fully and evenly mixed to ensure the demagnetization effect of the lithium battery ceramic separator powder; the preset cyclic stirring duration parameter is the duration for the slurry in the first flow tank to be fully mixed and uniform during the cycle, which is the standard duration in the device for removing magnetic foreign matters of the lithium battery ceramic separator powder. By determining the device for removing magnetic foreign matters of the lithium battery ceramic separator powder, it is convenient to better judge the mixing uniformity of the slurry in the first flow tank to ensure the demagnetization effect of the lithium battery ceramic separator powder; when the cyclic stirring duration parameter is greater than or equal to the preset cyclic stirring duration, the slurry in the first flow tank has been mixed evenly. At this time, the pump body and the electromagnetic demagnetizer corresponding to the first flow tank are opened, which better ensures the demagnetization effect of the lithium battery ceramic separator powder.

[0146] In one embodiment, opening the pump body and the electromagnetic demagnetizer corresponding to the first flow tank includes:

[0147] Obtain the core energy efficiency parameter of each pump body, where the core energy efficiency parameter includes shaft power, pump efficiency, and head.

[0148] It can be understood that the core energy efficiency parameters include shaft power, pump efficiency, and head. By collecting the core energy efficiency parameters of the pump body, it is convenient to determine the passing rate of the slurry in the electromagnetic separator corresponding to the first flow tank, and the passing rate of the slurry in the electromagnetic separator corresponding to the first flow tank has a greater impact on the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0149] Furthermore, perform pump type conversion processing on the core energy efficiency parameters to obtain a pump type conversion value.

[0150] It can be understood that in the device for removing magnetic foreign matters from lithium-ion battery ceramic separator powder, when a pump body model is determined to be used, the pump body has specific shaft power, pump efficiency, and head. And perform pump type conversion processing on the core energy efficiency parameters. Substitute the shaft power, pump efficiency, and head of the pump body into Pη / 2.73H for calculation, and the obtained value is the pump type conversion value.

[0151] Furthermore, detect whether the pump type conversion value matches the preset conversion value. It can be understood that the preset conversion value is limited by the staff, that is, when the pump type conversion processing satisfies the following formula

[0152] The pump type conversion processing satisfies the following formula: , where P is the shaft power in KW, η is the pump efficiency in %, and H is the head in m; by whether the pump type conversion value matches the preset conversion value, it is determined whether the selection of the pump body model meets the requirements, that is, the selection of the pump body model that can effectively improve the demagnetization efficiency of the lithium-ion battery ceramic separator powder is beneficial to ensuring the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0153] Furthermore, when the pump type conversion value matches the preset conversion value, obtain the demagnetization working current of the corresponding electromagnetic separator.

[0154] It can be understood that when the pump type conversion value matches the preset conversion value, it is determined that the model of the current pump body meets the conditions satisfied by the pump type conversion processing, which meets the selection of the pump body model that can effectively improve the demagnetization efficiency of the lithium-ion battery ceramic separator powder, and is beneficial to ensuring the demagnetization efficiency of the lithium-ion battery ceramic separator powder; the demagnetization working current of the electromagnetic separator is the current set demagnetization working current of the electromagnetic separator. By limiting the working current of the electromagnetic separator and the flow rate of the pump body, it is beneficial to ensure the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0155] Furthermore, perform magnetic induction conversion processing on the demagnetization working current to obtain a magnetic induction conversion value.

[0156] It can be understood that in the device for removing magnetic foreign matters from lithium-ion battery ceramic separator powder, when determining the model of an electromagnetic demagnetizer, the electromagnetic demagnetizer has a specific vacuum permeability, number of turns of the excitation coil, effective area of the magnetic flux, angle between the magnetic field direction and the effective section, and angles between the magnetic field direction and two orthogonal axes. The magnetic induction conversion process is performed on the demagnetization working current. By substituting the vacuum permeability, number of turns of the excitation coil, effective area of the magnetic flux, angle between the magnetic field direction and the effective section, and angles between the magnetic field direction and two orthogonal axes of the electromagnetic demagnetizer into 3μnIPη(cosθ 1 +cosθ 2 )Scosθ / 5.46H for calculation, the obtained value is the magnetic induction conversion value.

[0157] Furthermore, it is detected whether the magnetic induction conversion value matches the preset magnetic induction conversion value.

[0158] It can be understood that the preset magnetic induction conversion value is defined by the staff, that is, the magnetic induction conversion process satisfies the following formula

[0159] : ; μ is the vacuum permeability with the unit of 1; n is the number of turns of the excitation coil; I is the current with the unit of A, S is the effective area of the magnetic flux with the unit of m2; θ is the angle between the magnetic field direction and the effective section, and θ1 and θ2 are the angles between the magnetic field direction and two orthogonal axes respectively; by determining whether the magnetic induction conversion value matches the preset magnetic induction conversion value, it is determined whether the selected model of the electromagnetic demagnetizer meets the requirements, that is, the selection of the model of the electromagnetic demagnetizer that can effectively improve the demagnetization efficiency of the lithium-ion battery ceramic separator powder is beneficial to ensuring the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0160] Furthermore, when the magnetic induction conversion value matches the preset magnetic induction conversion value, a secondary opening signal is sent to the demagnetization central control device to open the pump body corresponding to the first flow tank and the electromagnetic demagnetizer.

[0161] It can be understood that when the magnetic induction conversion value matches the preset magnetic induction conversion value, it is determined that the model of the current electromagnetic demagnetizer meets the conditions satisfied by the magnetic induction conversion process, which meets the selection of the model of the electromagnetic demagnetizer that can effectively improve the demagnetization efficiency of the lithium-ion battery ceramic separator powder. Combined with the selection of the model of the pump body, it preferably ensures the demagnetization efficiency of the lithium-ion battery ceramic separator powder.

[0162] In one embodiment, for the diaphragm pump, P = 12kW; η = 85%; H = 18m;

[0163] For the electromagnetic demagnetizer: μ = 4π×10 −7 ; n = 800; I = 120A; S = 0.15m 2 ; cosθ 1 = 0.85; cosθ 2 = 0.8; cosθ = 0.9;

[0164] Substitute into the calculation:

[0165] , the demagnetization efficiency reaches 92%, and the unit energy consumption is 7.2 kWh / t.

[0166] In one of the embodiments, the diaphragm pump, P = 18 kW; η = 78%; H = 30 m;

[0167] The electromagnetic separator: μ = 4π×10 −7 ; n = 1000; I = 100 A; S = 0.2 m 2 ; cosθ 1 = 0.88; cosθ 2 = 0.82; cosθ = 0.92;

[0168] Substitute into the calculation:

[0169] , the demagnetization efficiency reaches 95%, and the unit energy consumption is 13.6 kWh / t.

[0170] In one of the embodiments, the diaphragm pump, P = 8 kW; η = 80%; H = 10 m;

[0171] The electromagnetic separator: μ = 4π×10 −7 ; n = 600; I = 80 A; S = 0.25 m 2 ; cosθ 1 = 0.8; cosθ 2 = 0.75; cosθ = 0.85;

[0172] Substitute into the calculation:

[0173] , the demagnetization efficiency reaches 97%, and the unit energy consumption is 11.2 kWh / t.

[0174] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, characterized in that: Used to be performed in a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder comprises two electric demagnetizers, a first flow tank, a second flow tank, a third flow tank and two pump bodies, the slurry in the first flow tank is transferred to the corresponding electric demagnetizer through one of the pump bodies and enters the second flow tank, the slurry in the second flow tank is transferred to the corresponding electric demagnetizer through the other pump body and enters the third flow tank; The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder comprises the following steps: Open the pump body and the electromagnetizer corresponding to the first flow tank; Obtaining a primary volume parameter of the slurry in the second flow tank; Detecting whether the first-level volume parameter is the same as a preset startup volume parameter; When the first-level volume parameter is the same as the preset starting volume parameter, a first-level start signal is sent to the demagnetization central control device to start the pump body and the electric demagnetizer corresponding to the second flow tank; Acquiring a secondary volume parameter of the slurry in the third flow tank; Detecting whether the secondary volume parameter is the same as a preset stop volume parameter; When the secondary volume parameter is the same as the preset stop volume parameter, a primary closing signal is sent to the demagnetization central control device to close the pump body and the electric demagnetizer corresponding to the first flow tank; Obtaining the magnetic foreign matter content of the slurry in the third flow tank; Detecting whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content; When the content of the magnetic foreign matter is greater than the preset content of the magnetic foreign matter, a circulation processing signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

2. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: Opening the pump body and the electromagnetizer corresponding to the first flow tank includes: Obtain the core energy efficiency parameters of each pump body, wherein the core energy efficiency parameters include shaft power, pump efficiency and head; Performing pump type conversion processing on the core energy efficiency parameter to obtain a pump type conversion value; Detecting whether the pump type conversion value matches a preset conversion value; When the pump type conversion value matches the preset conversion value, obtaining the demagnetization working current of the corresponding electric demagnetizer; Performing magnetic induction conversion processing on the demagnetization working current to obtain a magnetic induction conversion value; Detecting whether the magnetic induction conversion value matches a preset magnetic induction conversion value; When the magnetic induction conversion value matches the preset magnetic induction conversion value, a secondary start signal is sent to the demagnetization central control device to start the pump body and the electric demagnetizer corresponding to the first flow tank; The pump type conversion process satisfies the following formula: ； P is the shaft power, in KW, η is the efficiency of the pump, in %, H is the head, in m; The magnetic induction conversion process satisfies the following formula: ； μ is the vacuum permeability, unit is 1; n is the number of turns of the excitation coil; I is the current, unit is A, S is the effective area of ​​the magnetic flux, unit is m 2 ; θ is the angle between the magnetic field direction and the effective section, θ1 and θ2 are the angles between the magnetic field direction and the two orthogonal axes respectively.

3. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 2, characterized in that: The pump type conversion process satisfies the following formula: 。 4. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: When the first-level volume parameter is the same as the preset start-up volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the following steps are further included: Obtaining the primary magnetic foreign matter adsorption parameters of the electromagnetizer corresponding to the first flow tank; Detecting whether the primary magnetic foreign body adsorption parameter is greater than or equal to a preset magnetic foreign body adsorption saturation parameter; When the primary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, a primary closing signal is sent to the demagnetization central control device to close the pump body and the electromagnetizer corresponding to the first flow tank, and flush the corresponding electromagnetizer for magnetic foreign matter; And, when the first-level magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, a first-level closing signal is sent to the demagnetization central control device, and then it also includes: Obtaining the magnetic foreign matter content of the slurry in the third flow tank; Detecting whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content; When the content of the magnetic foreign matter is greater than the preset content of the magnetic foreign matter, a circulation processing signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

5. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: When the first-level volume parameter is the same as the preset start-up volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the following steps are further included: Obtaining the secondary magnetic foreign matter adsorption parameters of the electromagnetizer corresponding to the second flow tank; Detecting whether the secondary magnetic foreign matter adsorption parameter is greater than or equal to a preset magnetic foreign matter adsorption saturation parameter; When the secondary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, a secondary closing signal is sent to the demagnetization central control device to close the pump body and the electromagnetizer corresponding to the second flow tank, and the corresponding electromagnetizer is flushed for magnetic foreign matter; And, when the secondary magnetic foreign body adsorption parameter is greater than or equal to the preset magnetic foreign body adsorption saturation parameter, a secondary closing signal is sent to the demagnetization central control device, and then it also includes: Obtaining the magnetic foreign matter content of the slurry in the third flow tank; Detecting whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content; When the content of the magnetic foreign matter is greater than the preset content of the magnetic foreign matter, a circulation processing signal is sent to the demagnetization central control device so that the slurry in the third flow tank is input into the second flow tank.

6. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: Detecting whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content; When the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, a qualified output processing signal is sent to the magnetic removal central control device to output the slurry in the third flow tank to the outside of the third flow tank.

7. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: When the magnetic foreign matter content is greater than the preset magnetic foreign matter content, a cyclic processing signal is sent to the demagnetization central control device, and then the following steps are further included: Obtaining a circulation stirring time parameter of the first flow tank; Detect whether the cycle stirring time parameter is greater than or equal to the preset cycle stirring time parameter; When the circulation stirring time parameter is greater than or equal to the preset circulation stirring time, a secondary start signal is sent to the demagnetization central control device to start the pump body and the electric demagnetizer corresponding to the first flow tank.

8. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: The device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder also includes a demagnetization central control device. The demagnetization central control equipment comprises: A data acquisition module, the data acquisition module is used to obtain the primary volume parameter of the slurry in the second flow tank, the secondary volume parameter of the slurry in the third flow tank and the magnetic foreign matter content of the slurry in the third flow tank; An opening and closing module is used to open or close the corresponding electromagnetizer and the pump body according to the first-level opening signal and the first-level closing signal.

9. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: The volume of the second flow tank is smaller than the volume of the first flow tank and the third flow tank, and the volume of the second flow tank is ≥0.02m 3 .

10. The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to claim 1, characterized in that: The first flow tank is provided with a stirring blade, and the stirring blade is used to stir and mix the slurry in the first flow tank; and / or the first flow tank is connected to the third flow tank via a delivery pump.

Images