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

Abstract

The invention provides a method for removing magnetic foreign matters from lithium battery ceramic diaphragm powder. The method for removing the magnetic foreign matters of the lithium battery ceramic diaphragm powder comprises the following steps: acquiring a primary volume parameter of slurry in the second flowing tank; when the first-stage volume parameter is the same as the preset starting volume parameter, a first-stage starting signal is sent to demagnetization central control equipment; acquiring secondary volume parameters of the slurry in the third flow tank; when the second-level volume parameter is the same as the preset stopping volume parameter, a first-level closing signal is sent to the demagnetizing central control equipment; obtaining the magnetic foreign matter content of the slurry in the third flowing tank; and when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, sending a circular processing signal to the demagnetizing central control equipment. According to the method for removing the magnetic foreign matters of the lithium battery ceramic diaphragm powder, the removal efficiency of the magnetic foreign matters of the lithium battery ceramic diaphragm powder can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery material processing, and in particular to a method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder. Background Art

[0002] The core electrochemical components of the battery include positive electrode, negative electrode, diaphragm and electrolyte, especially ceramic diaphragm powder is particularly easy to introduce magnetic foreign matter, 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. Magnetic foreign matter will cause the safety risk of the battery to escalate, such as thermal runaway triggering, dendrite induction enhancement and gas production surge, etc. Therefore, demagnetizing the raw materials for the core electrochemical components of the battery is a key process link. 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 application number CN202310211095.0, and further demagnetized by A / B tank circulation, such as the utility model patent application with application number CN202221179898.X, but the A / B tank circulation demagnetization has the following problems: The "Lithium-ion Battery Diaphragm Industry Standard Conditions" require that Fe impurities be controlled at less than 5ppm. For the demagnetization of ceramic diaphragm powders with a high content of magnetic foreign matter, multiple cycles of demagnetization in tanks A and B are required, and the next cycle of demagnetization can only be carried out after all the materials in tanks A or B have been demagnetized once. The demagnetization efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, which can effectively improve the removal efficiency of magnetic foreign matter from lithium battery ceramic diaphragm powder.

[0004] The objective of the present invention is achieved through the following technical solutions: A method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, which is used to be performed in a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, wherein the device comprises two electric demagnetizers, a first flow tank, a second flow tank, a third flow tank and two pump bodies, wherein 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, and 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.

[0005] In one embodiment, 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 magnetic 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.

[0006] In one embodiment, the pump type conversion process satisfies the following formula: .

[0007] In one embodiment, when the volume parameter is the same as the preset volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the method further includes: 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.

[0008] In one embodiment, when the volume parameter is the same as the preset volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the method further includes: 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 primary 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 flush the corresponding electromagnetizer 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.

[0009] In one of the embodiments, 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.

[0010] In one embodiment, when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, a loop processing signal is sent to the demagnetization central control device, and then the method further includes: 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.

[0011] In one embodiment, the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder further 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.

[0012] In one embodiment, 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 .

[0013] In one embodiment, a stirring blade is provided in the first flow tank, and the stirring blade is used to stir and mix the slurry in the first flow tank.

[0014] In one embodiment, the first flow tank is connected to the third flow tank via a transfer pump.

[0015] Compared with the prior art, the present invention has at least the following advantages: The method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder of the present invention is used to be performed in a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, which has two pump bodies and two demagnetizers, and the slurry in the first flow tank is transferred to the corresponding electric demagnetizer through one pump body and enters the second flow tank, and 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, so as to control the flow rate of the slurry passing through any one of the electric demagnetizers. The pump body and the electric demagnetizer corresponding to the first flow tank are opened, and the primary volume parameters of the slurry in the second flow tank are collected to control the slurry in the second flow tank to be pumped into the electric demagnetizer through the corresponding pump body and enter the third flow tank. There is a margin, that is, the opening time of the pump body and the electromagnetizer corresponding to the second flow tank is controlled. On the basis of ensuring the demagnetization efficiency of the electric ceramic diaphragm powder, the energy consumption is reduced. Further, through the collection of the secondary volume parameters of the slurry in the third flow tank, the closing time of the pump body and the electromagnetizer corresponding to the first flow tank is controlled to maximize the extension of the operation time of the pump body and the electromagnetizer corresponding to the first flow tank. At this time, in conjunction with the collection of the magnetic foreign matter content of the slurry in the third flow tank, the time for the electromagnetizer corresponding to the first flow tank to stop excitation and complete the flushing stage is maximized, thereby greatly improving the demagnetization efficiency of the lithium battery ceramic diaphragm powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic structural diagram of a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to one embodiment of the present invention; Figure 2 The present invention is a flowchart of a method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to one embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central 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 method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] The present application provides a method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, which is used to be performed in a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder.

[0022] See also Figure 1 , a device 10 for removing magnetic foreign matter from lithium-ion ceramic diaphragm powder in one embodiment includes two electromagnetizers 101, a first flow tank 102, a second flow tank 103, a third flow tank 104 and two pump bodies 105. The first flow tank 102 is used to store slurry of lithium-ion ceramic diaphragm powder. The slurry is transferred to one of the electromagnetizers 101 through the first flow tank 102 and enters the second flow tank 103. The slurry is transmitted to another electromagnetizer 101 through the second flow tank 103 and enters the third flow tank 104, and the third flow tank 104 is connected to the first flow tank 102. The slurry of the first flow tank 102 is transferred to the corresponding electromagnetizer 101 through one of the pump bodies 105 and enters the second flow tank 103, and the slurry of the second flow tank 103 is transferred to the corresponding electromagnetizer 101 through another pump body 105 and enters the third flow tank 104 to control the flow rate of the slurry through any electromagnetizer 101.

[0023] 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 is ≥ 0.02m 3 .

[0024] It can be understood that the first flow tank and the third flow tank are the main locations for storing slurry. Therefore, in order to better ensure the demagnetization efficiency of lithium battery ceramic diaphragm powder, it is necessary to set the volume of the first flow tank and the second flow tank to be larger, and it is difficult to achieve miniaturization on the basis of ensuring the demagnetization efficiency. The second flow tank is a transfer tank, which is mainly used for temporary storage of slurry during the demagnetization process, so that the design of the second flow tank can be miniaturized. In this way, the footprint of the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder is effectively reduced.

[0025] In one embodiment, the first flow tank is connected to the third flow tank through a delivery pump. Furthermore, a stirring blade is provided in the first flow tank. It can be understood that the first flow tank and the third flow tank are connected, so that when there is more slurry stored in the third flow tank, if it is detected that the content of magnetic foreign matter in the slurry in the third flow tank is up to standard, the slurry in the third flow tank can be effectively returned to the first flow tank for further demagnetization treatment. Furthermore, the stirring blade is used to stir and mix the slurry in the first flow tank. The function of the stirring blade 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 arriving in the first flow tank after further demagnetization is better ensured, thereby better ensuring the demagnetization effect of the lithium battery ceramic diaphragm powder.

[0026] In one embodiment, the second flow tank is connected to the third flow tank through another delivery pump. Furthermore, a stirring blade is provided in the second flow tank, which better ensures the uniformity of the slurry arriving in the second flow tank after further demagnetization, thereby better ensuring the demagnetization effect of the lithium battery ceramic diaphragm powder.

[0027] See also Figure 1 In one embodiment, the device 10 for removing magnetic foreign matter from lithium battery ceramic diaphragm powder also includes a demagnetization central control device 106. Furthermore, the demagnetization central control device includes a data acquisition module and an opening and closing module. The data acquisition module is used to obtain the primary volume parameters of the slurry in the second flow tank, the secondary volume parameters of the slurry in the third flow tank, and the magnetic foreign matter content of the slurry in the third flow tank. The opening and closing module is used to open or close the corresponding electric demagnetizer and pump body according to the primary opening signal and the primary closing signal.

[0028] The above-mentioned method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder includes the following steps: starting the pump body and the electric demagnetizer corresponding to the first flow tank, so that the slurry in the first flow tank is pumped into the corresponding electric demagnetizer through the corresponding pump body and enters the second flow tank; obtaining the first-level volume parameter of the slurry in the second flow tank; detecting whether the first-level volume parameter is the same as the preset starting volume parameter; when the first-level volume parameter is the same as the preset starting volume parameter, sending a first-level start signal to the demagnetization central control device to start the pump body and the electric demagnetizer corresponding to the second flow tank, and the slurry in the second flow tank is pumped into the corresponding electric demagnetizer through the corresponding pump body and enters the third flow tank; and, when the first-level volume parameter is the same as the preset starting volume parameter, sending a first-level start signal to the demagnetization central control device. Start signal, and then also include: obtaining the secondary volume parameter of the slurry in the third flow tank; detecting 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, sending a first-level closing signal to the demagnetization central control device to close the pump body and the electric demagnetizer corresponding to the first flow tank; and when the secondary volume parameter is the same as the preset stop volume parameter, sending a first-level closing signal to the demagnetization central control device, and then also include: 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 the preset magnetic foreign matter content; when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, sending a circulation processing signal to the demagnetization central control device to input the slurry in the third flow tank into the first flow tank.

[0029] The above-mentioned method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder is used to be performed in a device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, which has two pump bodies and two demagnetizers, and the slurry in the first flow tank is transferred to the corresponding electric demagnetizer through one pump body and enters the second flow tank, and the slurry in the second flow tank is transferred to the corresponding electric demagnetizer through another pump body and enters the third flow tank to control the flow rate of the slurry through any one of the electric demagnetizers. The pump body and electric demagnetizer corresponding to the first flow tank are opened, and the primary volume parameters of the slurry in the second flow tank are collected to control the slurry in the second flow tank to be pumped into the electric demagnetizer through the corresponding pump body and enter the third flow tank. In the margin, that is, the opening time of the pump body and the electric demagnetizer corresponding to the second flow tank is controlled, and on the basis of ensuring the demagnetization efficiency of the electric ceramic diaphragm powder, the energy consumption is reduced. Further, by collecting the secondary volume parameters of the slurry in the third flow tank, the closing time of the pump body and the electric demagnetizer corresponding to the first flow tank is controlled to maximize the extension of the operation time of the pump body and the electric demagnetizer corresponding to the first flow tank. At this time, in conjunction with the collection of the magnetic foreign matter content of the slurry in the third flow tank, the time for the electric demagnetizer corresponding to the first flow tank to stop excitation and complete the flushing stage is maximized, thereby greatly improving the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0030] In order to better understand the method for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder of the present application, the method for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder of the present application is further explained below: See also Figure 2 A method for removing magnetic foreign matter from lithium battery ceramic diaphragm powder according to one embodiment of the present invention comprises the following steps: S100, start the pump body and the electromagnetizer corresponding to the first flow tank, so that the slurry in the first flow tank is pumped into the corresponding electromagnetizer through the corresponding pump body and then into the second flow tank.

[0031] It can be understood that the pump body pumps the slurry stored in the first flow tank into the electromagnetizer, and then passes through the electromagnetizer, where it is demagnetized, and enters the second flow tank.

[0032] S200, obtaining a primary volume parameter of the slurry in the second flow tank.

[0033] It can be understood that when the slurry in the first flow tank is demagnetized in the corresponding electromagnetizer, the slurry in the second flow tank will increase over time. Furthermore, the primary volume parameter of the slurry in the second flow tank is the volume of the slurry carried in the second flow tank. By collecting the primary volume parameter of the slurry in the second flow tank, it is convenient to determine whether there is still a surplus of slurry in the second flow tank after the pump body corresponding to the second flow tank is turned on, and after being pumped into the electromagnetizer through the pump body in real time and entering the third flow tank. This ensures that the flow rate of the slurry through the electromagnetizer remains consistent, thereby ensuring the demagnetization efficiency of the lithium battery ceramic diaphragm powder and reducing energy consumption.

[0034] S300: Detect whether the first-level volume parameter is the same as the preset startup volume parameter.

[0035] It can be understood that the preset startup volume parameter is the volume of the second flow tank and the pumping flow rate of the slurry by the pump during the operation of the equipment, that is, the volume obtained by actual testing when there is still a surplus after the slurry in the second flow tank is pumped into the electromagnetizer through the pump body and enters the third flow tank, which is the standard volume data after each structure is determined in the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder. By comparing the primary volume parameter with the preset startup volume parameter, the judgment of opening the pump body and the electromagnetizer corresponding to the second flow tank can be better determined.

[0036] S400. 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. The slurry in the second flow tank is pumped into the corresponding electric demagnetizer through the corresponding pump body and enters the third flow tank.

[0037] It can be understood that when the first-level volume parameter is the same as the preset starting volume parameter, it means that there is still a surplus after being pumped into the electromagnetizer through the pump body in real time and entering the third flow tank. At this time, the pump body and electromagnetizer corresponding to the second flow tank are turned on, which can better ensure the demagnetization efficiency of the lithium battery ceramic diaphragm powder and achieve a reduction in energy consumption.

[0038] And, 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 also includes: S500: Obtain secondary volume parameters of the slurry in the third flow tank.

[0039] 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 determine whether the slurry in the third flow tank has reached the maximum capacity of the third flow tank, that is, to delay the circulation of the slurry in the third flow tank to the maximum extent. It can be understood that if the slurry storage volume in the third flow tank does not reach the difference between the volume of the third flow tank and the volume of the second flow tank, that is, the pump body and the electromagnetizer corresponding to the first flow tank are closed, the actual total working time of the pump body and the electromagnetizer corresponding to the first flow tank is reduced, which has a greater impact on the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0040] S600: Detect whether the secondary volume parameter is the same as the preset stop volume parameter.

[0041] 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 after each structure in the magnetic foreign matter removal device of the lithium battery ceramic diaphragm powder is determined. By comparing the secondary volume parameter with the preset stop volume parameter, the judgment of opening the pump body and the electric demagnetizer corresponding to the first flow tank can be better determined, thereby better ensuring the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0042] S700: 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.

[0043] 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 reaches 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 the electric demagnetizer corresponding to the first flow tank are closed to better ensure the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0044] And, 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, and then it also includes: S800, obtaining the magnetic foreign matter content of the slurry in the third flow tank.

[0045] 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 content of magnetic foreign matter in the slurry in the third flow tank meets the standard, and it is convenient to determine whether the slurry in the third flow tank needs to be circulated and demagnetized. When 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 close the pump body and the electromagnetizer corresponding to the first flow tank, and perform the demagnetization after the maximum amount of slurry is present in the third flow tank. At this time, the time for the electromagnetizer corresponding to the first flow tank to stop excitation and complete the flushing stage is maximized, which is beneficial to improve the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0046] S900, detecting whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content.

[0047] It can be understood that the preset magnetic foreign matter content is the controlled content of ceramic diaphragm powder in the lithium battery industry, that is, the preset magnetic foreign matter content is the standard value of ceramic diaphragm powder in the lithium battery industry. By determining whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, it is helpful to determine whether the slurry in the third flow tank meets the lithium battery industry standards, and quickly determine whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment.

[0048] S1000. When the content of magnetic foreign matter is greater than the preset content of 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.

[0049] 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 electromagnetizer corresponding to the first flow tank are in a closed state. At this time, it is determined whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment, which greatly improves the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0050] The above-mentioned device is used to remove magnetic foreign matter from lithium battery ceramic diaphragm powder, which has two pump bodies and two demagnetizers, and the slurry in the first flow tank is transferred to the corresponding electric demagnetizer through one pump body and enters the second flow tank, and 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 to control the flow rate of the slurry through any one of the electric demagnetizers. The pump body and electric demagnetizer corresponding to the first flow tank are turned on, and the primary volume parameters of the slurry in the second flow tank are collected to control the slurry in the second flow tank to be pumped into the electric demagnetizer through the corresponding pump body and enter the third flow tank. There is still a surplus, that is, the second flow tank is controlled to be pumped into the electric demagnetizer through the corresponding pump body and enter the third flow tank. The opening time of the pump body and the electromagnetizer corresponding to the moving tank is controlled, and the energy consumption is reduced on the basis of ensuring the demagnetization efficiency of the electric ceramic diaphragm powder. The closing time of the pump body and the electromagnetizer corresponding to the first flow tank is further controlled by collecting the secondary volume parameters of the slurry in the third flow tank, so as to maximize the extension of the operation time of the pump body and the electromagnetizer corresponding to the first flow tank. At this time, in conjunction with the collection of the magnetic foreign matter content of the slurry in the third flow tank, the time for the electromagnetizer corresponding to the first flow tank to stop excitation and complete the flushing stage is maximized, thereby greatly improving the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0051] In one embodiment, when the volume parameter is the same as the preset volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the method further includes: Obtain the primary magnetic foreign matter adsorption parameters of the electromagnetizer corresponding to the first flow tank.

[0052] It can be understood that the first-level magnetic foreign matter adsorption parameter is the amount of magnetic foreign matter adsorbed in the electromagnetizer corresponding to the first flow tank. By collecting the first-level magnetic foreign matter adsorption parameter of the electromagnetizer corresponding to the first flow tank, it is convenient to determine whether the magnetic foreign matter in the electromagnetizer of the first flow tank has reached the maximum amount, so as to determine whether to stop the excitation of the electromagnetizer corresponding to the first flow tank, and to flush and remove the magnetic foreign matter in the electromagnetizer in time.

[0053] Further, it is detected whether the first-level magnetic foreign matter adsorption parameter is greater than or equal to a preset magnetic foreign matter adsorption saturation parameter.

[0054] It can be understood that the preset magnetic foreign matter adsorption saturation parameter is the maximum magnetic foreign matter adsorption amount of the electromagnetizer corresponding to the first flow tank. By detecting whether the first-level 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 electromagnetizer corresponding to the first flow tank, and to promptly flush and remove the magnetic foreign matter in the electromagnetizer, thereby better ensuring the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0055] Furthermore, 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 shutdown signal is sent to the demagnetization central control device to shut down the pump body and electromagnetizer corresponding to the first flow tank, and flush the corresponding electromagnetizer to remove magnetic foreign matter.

[0056] It can be understood that when the first-level magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, that is, the adsorption amount of magnetic foreign matter in the electromagnetizer corresponding to the first flow tank has reached the maximum magnetic foreign matter adsorption amount, after determining that the adsorption amount of magnetic foreign matter in the electromagnetizer has reached the maximum magnetic foreign matter adsorption amount, it is necessary to stop the excitation to ensure the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0057] And, when the first-level magnetic foreign body adsorption parameter is greater than or equal to the preset magnetic foreign body adsorption saturation parameter, a first-level closing signal is sent to the demagnetization central control device, and then it also includes: The magnetic foreign matter content of the slurry in the third flow tank is obtained.

[0058] 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 content of magnetic foreign matter in the slurry in the third flow tank meets the standard, and whether the slurry in the third flow tank needs to be circulated and demagnetized. When 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 close the pump body and the electromagnetizer corresponding to the first flow tank. After the magnetic foreign matter in the electromagnetizer corresponding to the first flow tank is saturated with adsorption, the time for the electromagnetizer corresponding to the first flow tank to stop excitation and complete the flushing stage is also maximized, which is beneficial to improve the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0059] Further, it is detected whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content.

[0060] It can be understood that the preset magnetic foreign matter content is the controlled content of ceramic diaphragm powder in the lithium battery industry, that is, the preset magnetic foreign matter content is the standard value of ceramic diaphragm powder in the lithium battery industry. By determining whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, it is helpful to determine whether the slurry in the third flow tank meets the lithium battery industry standards, and quickly determine whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment.

[0061] Furthermore, when the content of magnetic foreign matter is greater than a preset content of 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 first flow tank.

[0062] 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 electromagnetizer corresponding to the first flow tank are in a closed state. At this time, it is determined whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment, which greatly improves the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0063] It can be understood that by making the A / B tank circulate and maximizing the time of the demagnetization stage of the electric demagnetizer for circulation, the demagnetization efficiency of the lithium battery ceramic diaphragm powder is also improved. However, it only uses one electric demagnetizer for demagnetization, so the demagnetization can only be performed by the electric demagnetizer. Although the circulation process is carried out, the final result is the same as the conventional A / B tank circulation demagnetization efficiency. By increasing the number of electric demagnetizers, the latter electric demagnetizer of the sequential demagnetization can perform electric demagnetization synchronously without interfering with each other, thereby improving the demagnetization efficiency of the lithium battery ceramic diaphragm powder. In addition, the method for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder is implemented in the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder, which effectively ensures the demagnetization efficiency of the lithium battery ceramic diaphragm powder while miniaturizing the volume of the second flow tank and the third flow tank, thereby reducing the footprint of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder and improving the universality of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder.

[0064] It can also be understood that if the number of electric demagnetizers is too large, for example, more than two, the latter two electric demagnetizers and the supporting structure of the sequential demagnetization greatly increase the footprint of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder, affecting the application of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder in locations with limited site area, and the demagnetization efficiency of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder depends more on the demagnetization efficiency of the electric demagnetizer in the sequence. Even if the number of electric demagnetizers is increased, the demagnetization effect is still limited. That is, the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder in the present application, in conjunction with the method for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder, ensures the removal efficiency of the magnetic foreign matter from the lithium battery ceramic diaphragm powder while better ensuring the reduction of the footprint of the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder.

[0065] In one embodiment, when the volume parameter is the same as the preset volume parameter, a first-level start signal is sent to the demagnetization central control device, and then the method further includes: Obtain the secondary magnetic foreign matter adsorption parameters of the electromagnetizer corresponding to the second flow tank.

[0066] It can be understood that the secondary magnetic foreign matter adsorption parameter is the amount of magnetic foreign matter adsorbed in the electromagnetizer corresponding to the second flow tank. By collecting the secondary magnetic foreign matter adsorption parameter of the electromagnetizer corresponding to the second flow tank, it is convenient to determine whether the magnetic foreign matter in the electromagnetizer of the second flow tank has reached the maximum amount, so as to determine whether to stop the excitation of the electromagnetizer corresponding to the second flow tank, and to flush and remove the magnetic foreign matter in the electromagnetizer in time.

[0067] Further, it is detected whether the secondary magnetic foreign matter adsorption parameter is greater than or equal to a preset magnetic foreign matter adsorption saturation parameter.

[0068] It can be understood that the preset magnetic foreign matter adsorption saturation parameter is the maximum magnetic foreign matter adsorption amount of the electromagnetizer corresponding to the second flow tank. By detecting whether the secondary 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 electromagnetizer corresponding to the second flow tank, and to promptly flush and remove the magnetic foreign matter in the electromagnetizer, thereby better ensuring the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0069] Furthermore, when the first-level magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, a second-level shutdown signal is sent to the demagnetization central control device to shut down the pump body and the electromagnetizer corresponding to the second flow tank, and flush the magnetic foreign matter from the corresponding electromagnetizer.

[0070] It can be understood that when the secondary magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, that is, the adsorption amount of magnetic foreign matter in the electromagnetizer corresponding to the second flow tank has reached the maximum magnetic foreign matter adsorption amount, after determining that the adsorption amount of magnetic foreign matter in the electromagnetizer has reached the maximum magnetic foreign matter adsorption amount, it is necessary to stop the excitation to ensure the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0071] 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: The magnetic foreign matter content of the slurry in the third flow tank is obtained.

[0072] 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 content of magnetic foreign matter in the slurry in the third flow tank meets the standard, and it is convenient to determine whether the slurry in the third flow tank needs to be circulated and demagnetized. When 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 electric demagnetizer corresponding to the second flow tank. After the magnetic foreign matter adsorption in the electric demagnetizer corresponding to the second flow tank is saturated, the time for the electric demagnetizer corresponding to the second flow tank to stop excitation and complete the flushing stage is also maximized. In addition, since the demagnetization efficiency of the electric demagnetizer corresponding to the first flow tank has the greatest influence on the demagnetization efficiency of the lithium battery ceramic diaphragm powder, the electric demagnetizer corresponding to the second flow tank further reduces the content of magnetic foreign matter in the slurry circulated to the first flow tank, which is beneficial to improve the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0073] Further, it is detected whether the magnetic foreign matter content is less than or equal to a preset magnetic foreign matter content.

[0074] It can be understood that the preset magnetic foreign matter content is the controlled content of ceramic diaphragm powder in the lithium battery industry, that is, the preset magnetic foreign matter content is the standard value of ceramic diaphragm powder in the lithium battery industry. By determining whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, it is helpful to determine whether the slurry in the third flow tank meets the lithium battery industry standards, and quickly determine whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment.

[0075] Furthermore, when the content of magnetic foreign matter is greater than a preset content of 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.

[0076] 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 electromagnetizer corresponding to the second flow tank are in a closed state. At this time, it is determined whether the slurry in the third flow tank is subjected to a circulating demagnetization treatment, which greatly improves the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0077] Further, when the magnetic foreign matter content is greater than the preset magnetic foreign matter content, a circulation processing signal is sent to the demagnetization central control device to input the slurry in the third flow tank into the second flow tank, and then it also includes: Obtain the primary magnetic foreign matter adsorption parameters of the electromagnetizer corresponding to the first flow tank.

[0078] It can be understood that the first-level magnetic foreign matter adsorption parameter is the amount of magnetic foreign matter adsorbed in the electromagnetizer corresponding to the first flow tank. By collecting the first-level magnetic foreign matter adsorption parameter of the electromagnetizer corresponding to the first flow tank, it is convenient to determine whether the magnetic foreign matter in the electromagnetizer of the first flow tank has reached the maximum amount, so as to determine whether to stop the excitation of the electromagnetizer corresponding to the first flow tank, and to promptly flush and remove the magnetic foreign matter in the electromagnetizer. 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 battery ceramic diaphragm powder and better realizes the improvement of the demagnetization of the lithium battery ceramic diaphragm powder.

[0079] Further, it is detected whether the first-level magnetic foreign matter adsorption parameter is greater than or equal to a preset magnetic foreign matter adsorption saturation parameter.

[0080] It can be understood that the preset magnetic foreign matter adsorption saturation parameter is the maximum magnetic foreign matter adsorption amount of the electromagnetizer corresponding to the first flow tank. By detecting whether the first-level 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 electromagnetizer corresponding to the first flow tank, and to promptly flush and remove the magnetic foreign matter in the electromagnetizer, thereby better ensuring the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0081] Furthermore, 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 shutdown signal is sent to the demagnetization central control device to shut down the pump body and electromagnetizer corresponding to the first flow tank, and flush the corresponding electromagnetizer to remove magnetic foreign matter.

[0082] It can be understood that when the first-level magnetic foreign matter adsorption parameter is greater than or equal to the preset magnetic foreign matter adsorption saturation parameter, that is, the adsorption amount of magnetic foreign matter in the electromagnetizer corresponding to the first flow tank has reached the maximum magnetic foreign matter adsorption amount, after determining that the adsorption amount of magnetic foreign matter in the electromagnetizer has reached the maximum magnetic foreign matter adsorption amount, it is necessary to stop the excitation to ensure the demagnetization effectiveness of the lithium battery ceramic diaphragm powder.

[0083] In one of the embodiments, 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.

[0084] 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 content of magnetic foreign matter in the slurry in the third flow tank meets the standard, and it is convenient to determine whether the slurry in the third flow tank needs to be circulated and demagnetized; the preset magnetic foreign matter content is the control content of ceramic diaphragm powder in the lithium battery industry, that is, the preset magnetic foreign matter content is the standard value of ceramic diaphragm powder in the lithium battery industry. By determining whether the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, it is helpful 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 is circulated and demagnetized; when the magnetic foreign matter content is less than or equal to the preset magnetic foreign matter content, the slurry in the third flow tank meets the lithium battery industry standard, that is, the demagnetization is completed, and the slurry in the third flow tank is output to the outside of the third flow tank, and the cyclic demagnetization of the slurry in the third flow tank is ended. In one embodiment, 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 it also includes: 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.

[0085] It can be understood that the circulation stirring time parameter is the time for mixing and stirring after all the third flow tank is input into the first flow tank. By collecting the circulation stirring time parameter of the first flow tank, it is convenient to determine whether the slurry in the first flow tank is fully and evenly mixed, so as to ensure the demagnetization effect of the lithium battery ceramic diaphragm powder; the preset circulation stirring time parameter is the time for the slurry in the first flow tank to be fully and evenly mixed during the cycle, which is the standard time in the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder. By determining the device for removing magnetic foreign matter from the lithium battery ceramic diaphragm powder, it is convenient to better judge the mixing uniformity of the slurry in the first flow tank, so as to ensure the demagnetization effect of the lithium battery ceramic diaphragm powder; when the circulation stirring time parameter is greater than or equal to the preset circulation stirring time, the slurry in the first flow tank has been mixed evenly. At this time, the pump body and the electric demagnetizer corresponding to the first flow tank are turned on, which better ensures the demagnetization effect of the lithium battery ceramic diaphragm powder.

[0086] In one embodiment, opening the pump body and the electromagnetizer corresponding to the first flow tank includes: The core energy efficiency parameters of each pump body are obtained, wherein the core energy efficiency parameters include shaft power, pump efficiency and head.

[0087] 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 passage rate of the slurry in the electromagnetizer corresponding to the first flow tank. The passage rate of the slurry in the electromagnetizer corresponding to the first flow tank has a great influence on the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0088] Furthermore, the core energy efficiency parameters are subjected to pump type conversion processing to obtain pump type conversion values.

[0089] It can be understood that in the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, when a pump body model is determined to be used, the pump body has a specific shaft power, pump efficiency and pump head, and the core energy efficiency parameters are converted to a pump type. The shaft power, pump efficiency and pump head of the pump body are substituted into Pη / 2.73H for calculation, and the resulting value is the pump type conversion value.

[0090] Further, it is detected whether the pump type conversion value matches the preset conversion value.

[0091] It is understood that the preset conversion value is defined by the staff, that is, when the pump type conversion process satisfies the following formula The pump type conversion process satisfies the following formula: , P is shaft power, unit is KW, η is the efficiency of the pump, in %, and H is the head, in m. By matching the pump type conversion value with 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 battery ceramic diaphragm powder is conducive to ensuring the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0092] Further, when the pump type conversion value matches the preset conversion value, the demagnetization working current of the corresponding electric demagnetizer is obtained.

[0093] It can be understood that when the pump type conversion value matches the preset conversion value, it is determined that the current pump body model meets the conditions satisfied by the pump type conversion processing, and the selection of the pump body model is in line with the effective improvement of the demagnetization efficiency of the lithium battery ceramic diaphragm powder, which is beneficial to ensure the demagnetization efficiency of the lithium battery ceramic diaphragm powder; the demagnetization working current of the electric demagnetizer is the currently set demagnetization working current of the electric demagnetizer. By limiting the working current of the electric demagnetization and limiting the flow rate of the pump body, it is beneficial to ensure the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0094] Furthermore, the demagnetization working current is subjected to magnetic induction conversion processing to obtain a magnetic induction conversion value.

[0095] It can be understood that in the device for removing magnetic foreign matter from lithium battery ceramic diaphragm powder, when the model of an electric demagnetizer is determined to be used, the electric demagnetizer has a specific vacuum permeability, number of turns of the excitation coil, the effective area of ​​the magnetic flux, the angle between the magnetic field direction and the effective section, and the angle between the magnetic field direction and the two orthogonal axes, and the demagnetization working current is processed by magnetic induction conversion. The vacuum permeability, number of turns of the excitation coil, the effective area of ​​the magnetic flux, the angle between the magnetic field direction and the effective section, and the angle between the magnetic field direction and the two orthogonal axes of the electric demagnetizer are substituted into 3μnIPη(cosθ1+cosθ2)Scosθ / 5.46H for calculation, and the resulting value is the magnetic induction conversion value.

[0096] Further, it is detected whether the magnetic induction conversion value matches the preset magnetic induction conversion value.

[0097] 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: Mode: ; μ is the vacuum permeability, unit is 1; n is the number of turns of the excitation coil; I is the current in A, S is the effective area of ​​the magnetic flux in m2; 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; by determining whether the magnetic induction conversion value matches the preset magnetic induction conversion value, that is, determining whether the model of the electric demagnetizer meets the requirements, that is, the selection of the model of the electric demagnetizer that can effectively improve the demagnetization efficiency of the lithium battery ceramic diaphragm powder is beneficial to ensure the demagnetization efficiency of the lithium battery ceramic diaphragm powder.

[0098] Furthermore, 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.

[0099] 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 electric demagnetizer meets the conditions satisfied by the magnetic induction conversion processing, and meets the selection of the model of the electric demagnetizer that can effectively improve the demagnetization efficiency of the lithium battery ceramic diaphragm powder. Combined with the selection of the pump body model, the demagnetization efficiency of the lithium battery ceramic diaphragm powder can be better ensured.

[0100] In one embodiment, a diaphragm pump, P = 12 kW; η = 85%; H = 18 m; Electromagnetic demagnetizer: μ=4π×10 −7 ;n=800;I=120A;S=0.15m 2 ; cosθ1=0.85; cosθ2=0.8; cosθ=0.9; Substitute into the calculation: The demagnetization efficiency reaches 92%, and the unit energy consumption is 7.2kWh / t.

[0101] In one embodiment, a diaphragm pump, P = 18 kW; η = 78%; H = 30 m; Electromagnetic demagnetizer: μ=4π×10 −7 ;n=1000;I=100A;S=0.2m 2 ; cosθ1=0.88; cosθ2=0.82; cosθ=0.92; Substitute into the calculation: The demagnetization efficiency reaches 95%, and the unit energy consumption is 13.6kWh / t.

[0102] In one embodiment, a diaphragm pump, P = 8 kW; η = 80%; H = 10 m; Electromagnetic demagnetizer: μ=4π×10 −7 ;n=600;I=80A;S=0.25m 2 ; cosθ1=0.8; cosθ2=0.75; cosθ=0.85; Substitute into the calculation: The demagnetization efficiency reaches 97%, and the unit energy consumption is 11.2kWh / t.

[0103] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached 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 magnetic 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 volume parameter is the same as the preset 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 the corresponding electromagnetizer is flushed 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 volume parameter is the same as the preset 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 primary 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 flush the corresponding electromagnetizer for magnetic foreign matter; And, 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, 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 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 communicated with the third flow tank through a delivery pump.

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