A slurry testing device and method, and a slurry coating system

Abstract

The present application discloses a slurry detection device and method, and a slurry coating system, which relate to the field of battery technology. The present application adsorbs the first magnetic particles through the magnetic adsorption component on the periphery of the liquid transmission pipeline, and then obtains the situation of the first magnetic particles. The remaining second magnetic particles will be discharged into the insulating tank with the conductive liquid; when the second magnetic particles enter the insulating tank, the voltage in the conductive liquid will change, and the voltage change can be detected by the voltage detection component, so as to determine the situation of the second magnetic particles in the battery slurry. In this way, this embodiment does not require manual sampling and detection, and can directly determine the two particle conditions of the battery slurry through information such as the magnetic field change and the voltage change, which not only improves the detection efficiency, but also can obtain information on both strong magnetic and weak magnetic particles at the same time, so that based on more information and faster analysis methods, problems can be discovered in a timely manner, which is conducive to improving production efficiency and reducing safety hazards.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a slurry detection device and method, and a slurry coating system. Background Art

[0002] Battery slurry is an active material used to coat the positive and negative electrodes of batteries. Due to incoming materials, equipment wear and tear, environment, and human operation, there may be magnetic substances (metal particles, Fe, Ni, Zn, Cr, Cu, etc., single substances or alloys or oxides) in the battery slurry. And based on the conductivity, particle size, particle hardness, and particle surface geometry of these particles, there may be a risk of piercing the isolation membrane and causing a short circuit between the positive and negative electrodes. Batteries with more foreign particles often have a faster voltage drop and a shorter service life. As the battery is used for a longer time, serious quality and safety problems will occur.

[0003] The current method of monitoring magnetic substances in battery slurry is manual sampling and monitoring followed by a series of pre-processing and microscopic analysis to draw conclusions. This method is inefficient and cannot effectively and quickly analyze different magnetic substances, resulting in large information lags and limited information obtained, which restricts production efficiency and causes excessive particle outflow, seriously affecting product quality and production safety. Summary of the invention

[0004] The present application provides a slurry detection device and method, and a slurry coating system, which can improve the efficiency of analyzing magnetic substances in battery slurry and obtain more effective information, thereby ensuring production safety.

[0005] In a first aspect, the present application provides a slurry detection device, comprising: a liquid transmission pipeline, an insulating tank, a first particle detection component, and a second particle detection component;

[0006] The liquid transmission pipeline is used to transmit a conductive liquid containing target particles; the resistance of the target particles is different from that of the conductive liquid, and the target particles are obtained by filtering a preset amount of battery slurry; one end of the liquid transmission pipeline is placed inside the insulating tank to discharge the conductive liquid into the insulating tank;

[0007] The first particle detection component comprises:

[0008] A magnetic adsorption component is arranged at the periphery of the liquid transmission pipeline and is used to adsorb first magnetic particles in the target particles flowing in the liquid transmission pipeline to change its own magnetic field;

[0009] A magnetic field detection component is arranged beside the magnetic adsorption component and is used to detect the change of the magnetic field of the magnetic adsorption component to determine the condition of the first magnetic particles in the battery slurry;

[0010] The second particle detection component comprises:

[0011] a first power source, wherein a first electrode and a second electrode of the first power source are respectively immersed in different positions in the conductive liquid in the insulating tank;

[0012] A voltage detection component, wherein both ends of the voltage detection component are respectively immersed in different positions in the conductive liquid in the insulating tank, and is used to detect the voltage change of the conductive liquid in the insulating tank when the first power supply is powered on, so as to determine the situation of the second magnetic particles in the battery slurry.

[0013] In the slurry detection device in the embodiment of the present application, the liquid transmission pipeline is used to transmit the conductive liquid, and the magnetic adsorption component arranged on the periphery of the liquid transmission pipeline will adsorb the first magnetic particles to change its own magnetic field; then the magnetic field detection component is used for detection to obtain the first magnetic particles in the battery slurry. The remaining second magnetic particles will be discharged into the insulating tank along with the conductive liquid; the first power supply supplies power to the conductive liquid, and when the second magnetic particles enter the insulating tank, the voltage in the conductive liquid will change, and the voltage detection component is used to detect the voltage change, so that the second magnetic particles in the battery slurry can be determined.

[0014] In this way, this embodiment does not require manual sampling and testing, and can directly determine the two types of particles in the battery slurry through information such as magnetic field changes and voltage changes. It not only improves the detection efficiency, but also can obtain information on both strong magnetic and weak magnetic particles at the same time, so that based on more information and faster analysis methods, problems can be discovered in a timely manner, which is conducive to improving production efficiency and reducing safety hazards.

[0015] In a possible implementation, the device further includes: a processor;

[0016] The processor is connected to the magnetic field detection component and is used to determine the first magnetic particles in the battery slurry based on the magnetic field change of the magnetic adsorption component;

[0017] The processor is also connected to the voltage detection component and is used to determine the second magnetic particles in the battery slurry based on the voltage change of the conductive liquid in the insulating tank;

[0018] The processor is also used to determine an abnormal condition of particles in the battery slurry according to the first magnetic particle condition and the second magnetic particle condition.

[0019] In this implementation, the processor analyzes the magnetic field changes of the magnetic adsorption component and the voltage changes of the conductive liquid in the insulating tank, so as to determine the strong magnetic particles and weak magnetic particles in the battery slurry and quickly complete the data analysis.

[0020] In a possible implementation, the processor is connected to a lower computer;

[0021] The processor is also used to: when it is determined that there is an abnormality in the particles in the battery slurry, output an alarm message to the lower computer.

[0022] In a possible implementation, the magnetic adsorption component includes:

[0023] A solenoid, surrounding the periphery of the liquid transmission pipeline; when the solenoid is energized, the first magnetic particles passing through the solenoid are adsorbed;

[0024] A second power supply, wherein two poles of the second power supply are connected to two ends of the solenoid, and are used to energize the solenoid.

[0025] In this implementation, the solenoid is surrounded by the periphery of the liquid transmission pipeline, and the solenoid can be powered by a second power supply. There are strong magnetic particles in the conductive liquid flowing in the liquid transmission pipeline, and the specific magnetic force of the solenoid after power is turned on will absorb these strong magnetic particles. When the strong magnetic particles are adsorbed near the solenoid, the magnetic field of the solenoid will change. By detecting the change in the magnetic field of the solenoid, the situation of the strong magnetic particles can be known. This solution adopts a combination of a second power supply and a solenoid, which has a simple structure and can achieve the task well.

[0026] In a possible implementation, the magnetic field detection component includes:

[0027] a passive coil, the passive coil being arranged side by side with the solenoid to generate an induced electromotive force based on a change in a magnetic field of the solenoid;

[0028] The first voltage sampling circuit is connected in parallel with the passive coil and is used to collect the induced electromotive force; so as to determine the change of the magnetic field of the magnetic adsorption component based on the induced electromotive force.

[0029] In this implementation, the passive coil and the solenoid are arranged side by side. When the magnetic field of the solenoid changes, the passive coil will cut the magnetic field, thereby generating an induced electromotive force. The induced electromotive force is then collected by the first voltage sampling circuit, so that the magnetic field changes can be accurately known, and then the accurate strong magnetic particle situation can be obtained.

[0030] In a possible implementation, the first particle detection component further includes:

[0031] A shielding cover is located outside the magnetic adsorption component and the magnetic field detection component and is used to shield external electromagnetic signals.

[0032] In a possible implementation, the voltage detection component includes:

[0033] A sampling coil, wherein two ends of the sampling coil are respectively immersed in different positions of the conductive liquid in the insulating tank;

[0034] The second voltage sampling circuit is connected in parallel with the sampling coil and is used to collect the voltage change of the sampling coil to determine the voltage change of the conductive liquid in the insulating groove based on the voltage change of the sampling coil.

[0035] In this implementation, the voltage change of the conductive liquid can be obtained through the two ends of the sampling coil, and then the voltage is collected based on the second voltage sampling circuit to quickly obtain the weak magnetic particles in the battery slurry; this solution is not only simple in structure, but also can accurately obtain effective information.

[0036] In a possible implementation, the second particle detection component further includes:

[0037] A first voltage dividing module, wherein the first voltage dividing module is connected in series with the first power supply;

[0038] A second voltage dividing module is connected in series with the sampling coil.

[0039] In a second aspect, the present application provides a slurry coating system, comprising: a coating device, a slurry processing device, a particle conveying device, and the above-mentioned slurry detection device;

[0040] The coating device comprises: a first storage tank for containing battery slurry; the first storage tank comprises a first tank body and a first interface connected to the first tank body, and the coating device is used to coat the battery slurry to a preset position;

[0041] The slurry processing device is used to take out a preset amount of battery slurry sample from the first storage tank through the first interface, and wash and filter the battery slurry sample to obtain the target particulate matter after washing and filtering;

[0042] The particle conveying device is used to convey the target particles in the slurry processing device to the liquid transmission pipeline of the slurry detection device.

[0043] In one possible implementation, the particle conveying device includes a liquid storage tank and a first pumping device, wherein the first pumping device is used to extract the solution in the liquid storage tank so as to flush the target particles after cleaning and filtration in the slurry processing device into the liquid transmission pipeline through the solution.

[0044] In this implementation, the first pumping device can extract the solution in the liquid storage tank and flush the target particles from the slurry processing device into the insulating tank, thereby efficiently completing the transfer of the target particles.

[0045] In a possible implementation, the slurry processing device includes a sampling device;

[0046] The sampling device comprises a first pipeline assembly, a second storage tank, a filtering device, a second pumping device and a waste liquid container;

[0047] The first pipeline assembly includes a first pipeline and a second pipeline;

[0048] The second storage tank includes a second tank body, a second interface and a third interface communicating with the second tank body, the second interface is connected to the first interface; the third interface is connected to one end of the first pipeline;

[0049] The first liquid inlet of the filtering device is connected to the other end of the first pipeline, and the first liquid outlet of the filtering device is connected to one end of the second pipeline; the filtering device is used to filter the battery slurry to obtain the target particles in the battery slurry;

[0050] The second pumping device is located in the second pipeline and provides power to make the waste liquid flowing out of the filtering device flow to the waste liquid container via the second pipeline.

[0051] In this implementation, the sampling device can quickly complete the sampling and filtering of the battery slurry, wherein the second storage tank can temporarily store the sample and send it to the filtering device for filtration, thereby completing the extraction of the target particles. In addition, the filtering device is also connected to a waste liquid container, which can transport the waste liquid to the waste liquid container to achieve waste liquid recovery.

[0052] In a possible implementation, the pipeline between the first storage tank and the second storage tank further includes a first valve, and / or the second pipeline further includes a second valve.

[0053] In this implementation, the conductance of the corresponding pipelines can be controlled respectively by the first valve and the second valve, and the corresponding pipelines can be opened or closed in time according to needs, thereby realizing precise control of the sampling device, ensuring the accuracy of the battery slurry samples taken, and thereby improving the controllability of the entire system.

[0054] In a possible implementation, the slurry processing device further includes: a cleaning device; the cleaning device includes a second pipeline assembly, a cleaning liquid container and a third pumping device;

[0055] The second pipeline assembly includes a third pipeline, one end of which is connected to the second liquid inlet of the filter device; the other end of which is connected to the cleaning liquid container;

[0056] The third pumping device is located in the third pipeline and provides power to make the solution in the cleaning liquid container flow into the filtering device through the third pipeline.

[0057] In this implementation, the required cleaning liquid can be extracted through the third pumping device in the cleaning device, thereby realizing the cleaning operation of the battery slurry sample in the filtering device.

[0058] In a possible implementation, the second pipeline assembly further includes: a third valve disposed on the third pipeline.

[0059] In this implementation, the conduction of the third pipeline is controlled by the third valve, so that the cleaning device can be accurately controlled, and the third pipeline can be opened or closed in time according to demand, thereby improving the controllability of the entire system.

[0060] In a third aspect, the present application provides a slurry detection method, which is applied to the above-mentioned slurry detection device; the method comprises:

[0061] During the flow of the conductive liquid in the liquid transmission pipeline, the magnetic field change of the magnetic adsorption component is detected by the magnetic field detection component, and the voltage change of the conductive liquid in the insulating groove is detected by the voltage detection component;

[0062] Based on the change of the magnetic field of the magnetic adsorption component, the first magnetic particles in the battery slurry to be detected are determined; and based on the change of the voltage of the conductive liquid in the insulating tank, the second magnetic particles in the battery slurry are determined.

[0063] In a possible implementation, the magnetic field change of the magnetic adsorption component includes an actual change in magnetic flux; the first magnetic particle condition includes the number of first magnetic particles;

[0064] The determining of the first magnetic particle condition in the battery slurry to be detected based on the magnetic field change of the magnetic adsorption component includes:

[0065] Acquiring a reference change amount of the magnetic flux of the magnetic adsorption component after a single first magnetic particle is adsorbed by the magnetic adsorption component;

[0066] The number of the first magnetic particles is determined based on the actual change in the magnetic flux and the reference change in the magnetic flux.

[0067] In this implementation, the reference change in magnetic flux caused by the adsorption of a single first magnetic particle is predetermined, and then the actual change in magnetic flux is compared with the reference change in magnetic flux, so that the number of first magnetic particles currently adsorbed can be accurately known.

[0068] In a possible implementation, the voltage change of the conductive liquid in the insulating slot includes the number and signal strength of voltage mutation signals; the second magnetic particle condition includes the number and size of the second magnetic particles;

[0069] The determining of the second magnetic particles in the battery slurry based on the voltage change of the conductive liquid in the insulating groove comprises:

[0070] The number of the second magnetic particles is determined based on the number of signals, and the size of the second magnetic particles is determined based on the signal intensity.

[0071] In this implementation, when second magnetic particles enter the conductive liquid in the insulating groove, a voltage mutation signal will be generated between the first electrode and the second electrode due to the change in resistance in the conductive liquid. Based on the number of voltage mutation signals, the number of second magnetic particles entering the conductive liquid can be accurately determined; and based on the signal strength of the voltage mutation signal, the size of the second magnetic particles can be accurately determined.

[0072] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0074] Figure 1 A schematic structural diagram of a first slurry detection device provided in some embodiments of the present application;

[0075] Figure 2 A schematic structural diagram of a second slurry detection device provided in some embodiments of the present application;

[0076] Figure 3 A schematic structural diagram of a third slurry detection device provided in some embodiments of the present application;

[0077] Figure 4 A schematic structural diagram of a fourth slurry detection device provided in some embodiments of the present application;

[0078] Figure 5 A schematic structural diagram of a fifth slurry detection device provided in some embodiments of the present application;

[0079] Figure 6 A schematic structural diagram of a sixth slurry detection device provided in some embodiments of the present application;

[0080] Figure 7 A schematic diagram of a slurry coating system provided in some embodiments of the present application;

[0081] Figure 8 A schematic flow chart of a slurry detection method provided in some embodiments of the present application. DETAILED DESCRIPTION

[0082] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0085] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0087] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0088] The battery coating process is a key link in the production process of batteries (such as lithium batteries). Its main purpose is to evenly coat a layer of slurry on the positive and negative electrodes to form the required electrode structure. The coating process usually includes the following steps: unwinding, connecting, feeding into the coating device, coating, drying, forming and winding. The main purpose of the coating process is to evenly coat one or more layers of liquid slurry on the substrate to form a film layer with special functions. Specifically, the coating process includes the uniform application of positive and negative electrode slurries to ensure the performance and stability of the battery. It is particularly important to have a battery slurry that meets the process requirements.

[0089] As mentioned in the background technology, the battery slurry may contain Fe, Ni, Zn, Cr, Cu and other single substances, as well as some metal particles such as alloys and oxides. When there are many or large metal particles, it will bring serious safety hazards. In addition, different metal particles will have different effects on the production process; for example, the magnetism of metal particles, strong magnetic particles and weak magnetic particles will have different effects, and the degree of harm is also different, so it is necessary to analyze the two types of magnetic metal particles separately.

[0090] Traditional methods for testing metal particles in battery slurry usually involve manual sampling and a series of pretreatments before observation under a microscope. This method is not only inefficient, but also subjective, and the results of microscopic observations are not accurate. More importantly, this method cannot distinguish the magnetism of metal particles, nor can it detect particles of different magnetism separately, so it cannot perform targeted analysis.

[0091] It can be seen that the traditional particle detection scheme for battery slurry is inefficient, has low result accuracy and lacks sufficient particle information, which will lead to the inability to timely detect abnormalities in particles in battery slurry, and may cause safety accidents.

[0092] In response to the above technical problems, the study found that the strong magnetic particles in the battery slurry can be adsorbed by magnetic objects, thereby affecting the magnetic field of the magnetic object, and the effects of different sizes and different numbers of strong magnetic particles on the magnetic field are also different. Based on this, a device can be designed that can change its own magnetic field by adsorbing strong magnetic particles, and then determine the particle situation of strong magnetic particles in the battery slurry.

[0093] Furthermore, by adsorbing strong magnetic particles through the above device, the strong magnetic particles and weak magnetic particles in the battery slurry can be separated, so that the two types of particles can be detected separately. Further research found that the remaining weak magnetic particles have resistance. In order to detect the weak magnetic particles, they can be discharged into a pre-prepared conductive liquid. Two electrodes can be used to detect the resistance change in the conductive liquid, and then the particle situation of the weak magnetic particles in the battery slurry can be determined.

[0094] To this end, an embodiment of the present application provides a slurry detection device, which is described in detail below in conjunction with the accompanying drawings. However, it should be noted that the structure shown in the drawings is merely an example of the present application and does not limit other schemes of the present application. Figure 1 The schematic diagram of the structure of the first slurry detection device provided in some embodiments of the present application. Figure 1 As shown, the slurry detection device mainly includes: a liquid transmission pipeline 11, an insulating tank 12, a first particle detection component 13 and a second particle detection component 14;

[0095] The liquid transmission pipeline 11 is used to transmit a conductive liquid containing target particles; the resistance of the target particles is different from that of the conductive liquid, and the target particles are filtered from a preset amount of battery slurry; one end of the liquid transmission pipeline 11 is placed inside the insulating groove 12 to discharge the conductive liquid into the insulating groove 12.

[0096] The first particle detection assembly 13 comprises:

[0097] The magnetic adsorption component 131 is disposed at the periphery of the liquid transmission pipeline 11 and is used to adsorb the first magnetic particles in the target particles flowing in the liquid transmission pipeline 11 to change its own magnetic field;

[0098] The magnetic field detection component 132 is disposed beside the magnetic adsorption component 131 and is used to detect the change of the magnetic field of the magnetic adsorption component 131 to determine the first magnetic particles in the battery slurry;

[0099] The second particle detection assembly 14 comprises:

[0100] A first power source 141, a first electrode and a second electrode of the first power source 141 are respectively immersed in different positions in the conductive liquid in the insulating tank 12;

[0101] The voltage detection component 142 has two ends immersed in different positions in the conductive liquid in the insulating tank 12, and is used to detect the voltage change of the conductive liquid in the insulating tank 12 when the first power supply 141 is powered on, so as to determine the second magnetic particles in the battery slurry.

[0102] The first particle detection component 13 specifically detects the first magnetic particles (strong magnetic particles) to obtain the first magnetic particles, while the second particle detection component 14 detects the second magnetic particles (weak magnetic particles) to obtain the second magnetic particles.

[0103] In practical applications, the specific structure, inner diameter and material of the liquid transmission pipeline 11 can be selected according to the requirements. As a long pipeline, the liquid transmission pipeline 11 involves two detection parts, strong magnetic particles and weak magnetic particles, and different parts have different requirements for the liquid transmission pipeline 11; therefore, liquid transmission pipelines 11 of different materials and different inner diameters can be selected for different sections.

[0104] For the first magnetic particles (strong magnetic particles), the present application detects the particles by adsorbing them through a magnetic field. Therefore, the liquid transmission pipeline 11 of the first magnetic particle detection part is generally made of non-magnetic conductive materials, and it is necessary to prevent the pipeline material from affecting the detection of the first magnetic particles. In addition, the first magnetic particles will be adsorbed by the magnetic adsorption component 131. If the inner diameter of this part of the liquid transmission pipeline 11 is too small, the pipeline will be blocked by the target particles. Therefore, the pipeline section of the first magnetic particle detection part can be set with a larger inner diameter; and the thickness of the pipeline should not be too thick to avoid affecting the adsorption effect.

[0105] As for the second magnetic particles (weak magnetic particles), the detection is based on the voltage change caused when the second magnetic particles are discharged into the insulating groove 12 along with the conductive liquid. Assuming that the specific number of second magnetic particles discharged into the insulating groove 12 each time cannot be confirmed, it is difficult to determine the number of second magnetic particles based on the voltage change. If the inner diameter of the liquid transmission pipeline 11 is set too large, it will lead to the inability to determine the number of particles after the voltage change is detected. Therefore, the pipeline section of the second magnetic particle detection part can be set with a smaller inner diameter. If the inner diameter of the liquid transmission pipeline 11 is too small, the pipeline will be blocked by particles. Therefore, the inner diameter of the liquid transmission pipeline 11 should not be too large or too small.

[0106] As a feasible implementation method, the size range of the second magnetic particles to be detected can be determined first, and then the inner diameter of the pipeline of the second magnetic particle detection part can be determined based on the size of the target particles to be detected; for example, the discharge port of the liquid transmission pipeline 11 can be set to accommodate only one second magnetic particle passing through at a time. In addition, it is also necessary to consider the situation where other particles besides the second magnetic particles mistakenly enter the pipeline section. In order to avoid pipeline blockage, the inner diameter of the pipeline can be slightly increased.

[0107] In addition, the end of the liquid transmission pipeline 11 is connected to the insulating groove 12, and the conductive liquid needs to be discharged into the insulating groove 12; and the specific docking structure between the liquid transmission pipeline 11 and the insulating groove 12 needs to be set according to actual needs. Because when the second magnetic particles are detected, the second magnetic particles in the battery slurry are determined based on the voltage change of the conductive liquid in the insulating groove 12 when the second magnetic particles enter the insulating groove 12. Compared with the conductive liquid, the particles have a greater density. After entering the insulating groove 12, the particles usually sink to the bottom. In order to ensure that the resistance change caused by the second magnetic particles entering the conductive liquid of the insulating groove 12 can be detected, the discharge port at the end of the liquid transmission pipeline 11 can be set at an upper position in the insulating groove 12.

[0108] When the first particle detection component 13 detects the first magnetic particles, it is necessary to generate a magnetic field through the magnetic adsorption component 131 and adsorb the first magnetic particles, and after adsorbing the first magnetic particles, it is necessary to change its own magnetic field; therefore, the magnetic adsorption component 131 is arranged at the periphery of the liquid transmission pipeline 11. The specific positions of the magnetic adsorption component 131 and the liquid transmission pipeline 11 can be selected according to actual conditions, and the two can be separated by a first preset distance. The first preset distance should not be set too large, otherwise it will fail to adsorb the second magnetic particles.

[0109] The magnetic adsorption component 131 can be a common element such as a permanent magnet, and in order to improve the controllability of the entire device, a solenoid connected to a power source can be selected, and the two ends of the solenoid are energized, and the solenoid generates a magnetic field. In order to better adsorb the first magnetic particles, the liquid transmission pipeline 11 can pass through the inside of the solenoid.

[0110] In order to determine the first magnetic particle situation, it is necessary to obtain the magnetic field change situation of the magnetic adsorption component 131 through the magnetic field detection component 132; therefore, the magnetic field detection component 132 needs to be set beside the magnetic adsorption component 131. The specific positions of the magnetic field detection component 132 and the magnetic adsorption component 131 can be selected according to actual conditions, and the two can be separated by a second preset distance. The second preset distance should not be set too large, otherwise it will not be possible to accurately obtain the magnetic field change situation of the magnetic adsorption component 131.

[0111] When the second particle detection component 14 detects the second magnetic particles, the voltage detection component 142 is required to detect the voltage change of the conductive liquid in the insulating tank 12 to determine the second magnetic particles in the battery slurry. Therefore, the voltage detection component 142 and the two ends of the voltage detection component 142 need to be immersed in different positions in the conductive liquid in the insulating tank 12, respectively. In order to ensure the accuracy of the detection, the two ends of the voltage detection component 142 can be respectively set at the two ends of the insulating tank 12 to better monitor the resistance change of the conductive liquid inside the entire insulating tank 12.

[0112] After the second magnetic particles enter the insulating groove 12, the resistance of the conductive liquid will change, and the voltage detection component 142 specifically obtains the voltage of the conductive liquid; therefore, it is necessary to set a first power supply 141, and the first electrode and the second electrode of the first power supply 141 are respectively immersed in different positions in the conductive liquid in the insulating groove 12, so as to provide power for the conductive liquid. Similarly, the first electrode and the second electrode of the first power supply 141 can also be set at both ends of the insulating groove 12, and the two ends of the voltage detection component 142 can be set between the first electrode and the second electrode.

[0113] In addition, the material of the insulating slot 12 is not specifically limited, and is mainly used to achieve electrical insulation, thereby ensuring the accuracy of the internal detection of the second magnetic particles. The insulating slot 12 can be made of any insulating material, and in the embodiment of the present application, the shape and size of the insulating slot 12 are not specifically limited, for example, it can be square, and the specific size can be set according to the amount of conductive liquid that needs to be accommodated.

[0114] The conductive liquid can be selected according to actual needs, and needs to ensure normal conductivity. In order to complete the voltage detection, the conductive liquid cannot react with the target particles, and the resistance of the conductive liquid needs to be different from the resistance of the target particles, so that after the second magnetic particles enter the conductive liquid in the insulating slot 12, the resistance of the conductive liquid can change, thereby causing the voltage between the first electrode and the second electrode of the DC power supply to change. As an example, the conductive liquid can be an electrolyte used to make a battery.

[0115] The target particulate matter is particulate matter with a particle size within a target range obtained by filtering a preset amount of battery slurry.

[0116] Typically, battery slurry is a key material used in the battery manufacturing process, mainly composed of active substances, conductive agents, binders and solvents. The metal particles present in the battery slurry will cause adverse consequences, so the purpose of the embodiments of the present application is to detect such metal particles. Therefore, as an example of target particulate matter, the target particulate matter includes but is not limited to single substances such as Fe, Ni, Zn, Cr and Cu, as well as metal particles such as some alloys and oxides. There are strong magnetic particles and weak magnetic particles in these particulates. The embodiments of the present application detect the two types of particles respectively through two detection components, thereby obtaining more detailed particle information of the battery slurry to be detected.

[0117] In addition, the target range is set by the detection requirements. Generally, only when the size of these particles reaches a certain level (for example, above 25um) will they have an impact. Therefore, when filtering the battery slurry, in addition to filtering out the substances in the battery slurry itself, some smaller particles will also be filtered out, thereby extracting larger metal particles as target particles. Filtering out the remaining substances and retaining only these larger target particles and testing them can avoid the influence of other substances on the test results and ensure the accuracy of the final results. Therefore, the target range is usually a range that can affect the quality of the product, such as a range where the particle size is greater than the preset particle size. For example, the target range can be a range where the particle size is greater than 25 um.

[0118] This application usually tests the particle conditions of the battery slurry to be used. Under normal circumstances, it is impossible to test all the battery slurries. Instead, a part of the battery slurry is sampled, and then based on the test results, the particle conditions of all the battery slurries are reflected. If the overall situation needs to be reflected based on the particle conditions of the sampled part, the sampling amount needs to be controlled. In order to ensure that the sampled battery slurry sample is of reference value, the size of the preset sampling amount can be set based on the total amount of battery slurry, or quantitative sampling can be performed; for example, the preset amount can be set to 1 / 20 of the battery slurry or 1 kg of battery slurry sample can be taken.

[0119] In addition, during the battery production process, the battery slurry may be tested periodically. Therefore, in order to ensure the comparability of different test results, it is also necessary to ensure that the sample size is the same each time. For this reason, this application sets the battery slurry sample for each sampling to a preset amount.

[0120] In practical applications, the particle conditions of the battery slurry may specifically include the number and size of the target particles. As described above, the number of first magnetic particles may be determined based on the change in the magnetic field, for example, the change in the magnetic flux of the magnetic adsorption component 131 may be determined, and then the number of first magnetic particles may be derived based on the reference change in the magnetic flux after a single first magnetic particle is adsorbed.

[0121] The size and quantity of the second magnetic particles can be determined based on the voltage change in the conductive liquid in the insulating groove 12. For example, the voltage mutation signals in the conductive liquid in the insulating groove 12 can be counted, the number of the second magnetic particles can be determined by the number of signals, and the size of the second magnetic particles can be determined based on the signal strength.

[0122] In addition, in actual applications, when the number and size of the detected target particles are sufficient to determine that the particle situation of the battery slurry is abnormal, an alarm message can be issued to provide a timely reminder. After the abnormality of the particle situation has been known, the detection can be stopped, or repeated, or the detection of target particles in the entire conductive liquid can be continued, so as to obtain accurate data and evaluate the current risk level.

[0123] In the slurry detection device in the embodiment of the present application, the liquid transmission pipeline 11 is used to transmit the conductive liquid. The magnetic adsorption component 131 arranged on the periphery of the liquid transmission pipeline 11 will adsorb the first magnetic particles to change its own magnetic field; then the magnetic field detection component 132 is used for detection to obtain the first magnetic particles in the battery slurry. The remaining second magnetic particles will be discharged into the insulating tank 12 along with the conductive liquid; the first power supply 141 supplies power to the conductive liquid. When the second magnetic particles enter the insulating tank 12, the voltage in the conductive liquid will change. The voltage detection component 142 detects the voltage change, so that the second magnetic particles in the battery slurry can be determined.

[0124] In this way, this embodiment does not require manual sampling and testing, and can directly determine the two types of particles in the battery slurry through information such as magnetic field changes and voltage changes. It not only improves the detection efficiency, but also can obtain information on both strong magnetic and weak magnetic particles at the same time, so that based on more information and faster analysis methods, problems can be discovered in a timely manner, which is conducive to improving production efficiency and reducing safety hazards.

[0125] In order to improve safety, as another embodiment of the present application, when it is determined that the particles in the battery slurry are abnormal, it is necessary to take timely solutions. Therefore, the processor can be connected to the lower computer; when it is determined that the particles in the battery slurry are abnormal, the processor outputs an alarm message to the lower computer.

[0126] The specific form of the lower computer is selected according to the actual situation. Generally, the whole system is automatically controlled by a programmable logic controller. Therefore, the programmable logic controller can be used as the lower computer of the processor to send the alarm information of abnormal particle conditions to the programmable logic controller. After receiving the alarm information, the programmable logic controller can remind the staff through lights and sounds. The alarm information may include information such as the number of target particles detected by the processor and the particle size, so that the staff can know the particle conditions in time.

[0127] In this implementation, when abnormal conditions of particles in the battery slurry are detected, alarm information is output to the lower computer in a timely manner, thereby avoiding safety accidents.

[0128] In order to ensure that the first magnetic particles in the liquid transmission pipeline 11 can be adsorbed, it is necessary to provide a suitable magnetic adsorption component; and a corresponding magnetic field detection component is required to realize the detection. Figure 2 This is a schematic diagram of the structure of a second slurry detection device provided in some embodiments of the present application. Figure 2As shown, the magnetic adsorption component 131 includes a solenoid 1311 surrounding the periphery of the liquid transmission pipeline 11, and a second power source 1312 connected to both ends of the solenoid 1311. The two poles of the second power source 1312 are connected to both ends of the solenoid 1311 to energize the solenoid 1311, and when the solenoid 1311 is energized, the first magnetic particles passing through the solenoid 1311 are adsorbed.

[0129] The inner diameter of the solenoid 1311, the number of turns, and the voltage of the second power supply 1312 can be selected according to actual needs. The inner diameter of the solenoid 1311 should not be too large. Generally, the inner diameter of the solenoid 1311 needs to be determined according to the outer diameter of the liquid transmission pipeline 11 to ensure that the solenoid 1311 is close to the liquid transmission pipeline 11, so as to adsorb the second magnetic particles.

[0130] In this implementation, the solenoid 1311 surrounds the periphery of the liquid transmission pipeline 11, and the solenoid 1311 can be powered by the second power supply 1312. There are strong magnetic particles in the conductive liquid flowing in the liquid transmission pipeline 11, and the specific magnetic force of the solenoid 1311 after being energized will absorb these strong magnetic particles. After the strong magnetic particles are absorbed near the solenoid 1311, the magnetic field of the solenoid 1311 will change. By detecting the change in the magnetic field of the solenoid 1311, the situation of the strong magnetic particles can be known. This solution adopts a combination of the second power supply 1312 and the solenoid 1311, which has a simple structure and can better achieve the task.

[0131] In order to detect the change of the magnetic field of the solenoid 1311 , this embodiment provides another implementation scheme. The magnetic field detection component 132 includes a passive coil 1321 arranged side by side with the solenoid 1311 , and a first voltage sampling circuit 1322 connected in parallel with the passive coil 1321 .

[0132] In this structure, after the solenoid 1311 is energized, the solenoid 1311 will absorb the first magnetic particles in the liquid transmission pipeline 11, thereby changing the magnetic field of the solenoid 1311 itself. After the magnetic field of the solenoid 1311 changes, the passive coil 1321 will cut the magnetic field again, thereby generating an induced electromotive force. The induced electromotive force generated by the passive coil 1321 is then collected by the first voltage sampling circuit 1322; based on the induced electromotive force, the magnetic field change of the magnetic adsorption component can be determined, and the situation of the adsorbed first magnetic particles can be obtained.

[0133] In this implementation, the passive coil 1321 and the solenoid 1311 are arranged side by side. After the magnetic field of the solenoid 1311 changes, the passive coil 1321 will cut the magnetic field, thereby generating an induced electromotive force, which is then collected by the first voltage sampling circuit 1322. The magnetic field change can be accurately known, and the accurate strong magnetic particle situation can be obtained.

[0134] In addition, since the first magnetic particles detected in this application are strong magnetic particles, and the first magnetic particles need to be adsorbed by a magnetic adsorption component, and may be interfered by factors such as external magnetic fields. In addition, the specific means for this application to obtain the situation of the first magnetic particles is to obtain the change of the magnetic field, which may also be affected by the external magnetic field; therefore, it is necessary to eliminate the influence of external factors. Figure 3 This is a schematic diagram of the structure of a third slurry detection device provided in some embodiments of the present application. Figure 3 As shown, the first particle detection component 13 may further include a shielding cover 133. The shielding cover 133 is located outside the magnetic attraction component 131 and the magnetic field detection component 132, and is used to shield external electromagnetic signals.

[0135] In this embodiment, the external magnetic signal is shielded by the shielding cover 133, so that the external magnetic signal can be prevented from affecting the change of the internal magnetic field, thereby ensuring the accuracy of the final result.

[0136] In order to accurately obtain the voltage change of the conductive liquid in the insulating groove, this embodiment provides a specific implementation method. Figure 4 This is a schematic diagram of the structure of a fourth slurry detection device provided in some embodiments of the present application. Figure 4 As shown, the voltage detection component 142 includes a sampling coil 1421 and a second voltage sampling circuit 1422. The two ends of the sampling coil 1421 are used as the two ends of the voltage detection component 142, and are immersed in different positions in the conductive liquid in the insulating tank. The second voltage sampling circuit 1422 is connected in parallel with the sampling coil 1421 to collect the voltage change of the sampling coil 1421, so as to determine the voltage change of the conductive liquid in the insulating tank based on the voltage change of the sampling coil 1421.

[0137] This embodiment can obtain the voltage change of the conductive liquid through the two ends of the sampling coil, and then perform voltage sampling based on the second voltage sampling circuit to quickly obtain the weak magnetic particles in the battery slurry.

[0138] In the specific implementation process, in order to avoid short circuit and other situations, an optional implementation method is provided here, the second particle detection component also includes: a first voltage divider module connected in series with the first power supply and a second voltage divider module connected in series with the sampling coil. Figure 4As shown, the first voltage divider module and the second voltage divider module both use protective resistors, namely the first protective resistor 143 and the second protective resistor 144. The first protective resistor 143 is connected in series with the first power supply 141 in the circuit. Even if the first electrode and the second electrode of the first power supply 141 are short-circuited, the first power supply 141 can be effectively prevented from being short-circuited by the first protective resistor 143. The second protective resistor 144 is connected in series with the sampling coil 1421 in the circuit to play a protective role. By setting a voltage divider module, this embodiment can avoid short circuits, thereby ensuring the safety of the detection process.

[0139] In practical applications, the quantity and size of the first magnetic particles and the second magnetic particles in the battery slurry may affect production, so the quantity and / or size of the first magnetic particles and the second magnetic particles in the battery slurry need to be detected according to demand.

[0140] In order to obtain the particle size and particle quantity of the target particles, a processor can be added to the detection component. Here is a specific implementation method:

[0141] The processor is connected to the magnetic field detection component and is used to determine the first magnetic particles in the battery slurry based on the magnetic field change of the magnetic adsorption component;

[0142] The processor is also connected to the voltage detection component and is used to determine the condition of the second magnetic particles in the battery slurry based on the voltage change of the conductive liquid in the insulating tank;

[0143] The processor is also used to determine abnormal conditions of particles in the battery slurry based on the first magnetic particle conditions and the second magnetic particle conditions.

[0144] It should be noted that the magnetic field detection component and the voltage detection component can be connected to the same processor, or each can be connected to a separate processor. The following takes the example that the magnetic field detection component and the voltage detection component are each connected to a separate processor.

[0145] Figure 5 This is a schematic diagram of the structure of a fifth slurry detection device provided in some embodiments of the present application. Figure 5 As shown, it includes a first signal acquisition processing unit 15, a solenoid 1311, a first control circuit 17 and a second power supply 1312. The first signal acquisition processing unit 15 is specifically composed of a passive coil 1321, a first voltage sampling circuit 1322 and a first processor 16. The first control circuit 17 is connected to the second power supply 1312, and is used to control the disconnection of the second power supply 1312 and adjust the voltage value of the second power supply 1312. The induced electromotive force generated by the passive coil 1321 is collected by the first voltage sampling circuit 1322, and the data is sent to the first processor 16, and finally the first magnetic particle situation is obtained.

[0146] Figure 6 This is a schematic diagram of the structure of the sixth slurry detection device provided in some embodiments of the present application. Figure 6 As shown, it includes a second signal acquisition and processing unit 18, a first protection resistor 143, a second control circuit 20 and a first power supply 141. The second signal acquisition and processing unit 18 is specifically composed of a sampling coil 1421, a second protection resistor 144, a second voltage sampling circuit 1422 and a second processor 19. The second control circuit 20 is connected to the first power supply 141, and is used to control the disconnection of the first power supply 141 and adjust the voltage value of the first power supply 141. The first protection resistor 143 can prevent the first power supply 141 from short-circuiting, and the second protection resistor 144 can protect the sampling coil 1421. The second voltage sampling circuit 1422 is connected in parallel with the sampling coil 1421, and is used to collect the voltage change of the sampling coil 1421, and then send the data to the second processor 19. The second processor 19 determines the voltage change of the conductive liquid in the insulating slot based on the voltage change of the sampling coil 1421.

[0147] In this implementation, the processor analyzes the magnetic field changes of the magnetic adsorption component and the voltage changes of the conductive liquid in the insulating tank, so as to determine the strong magnetic particles and weak magnetic particles in the battery slurry and quickly complete the data analysis.

[0148] A feasible implementation scheme is provided here. The conductive liquid containing target particles (first magnetic particles and second magnetic particles) flows in the liquid transmission pipeline 11 and first passes through the first particle detection component 13 to complete the detection of the first magnetic particles.

[0149] After the solenoid 1311 in the first particle detection component 13 is energized, the solenoid 1311 will absorb the first magnetic particles in the liquid transmission pipeline 11, thereby changing the magnetic field of the solenoid 1311 itself. After the magnetic field of the solenoid 1311 changes, the passive coil 1321 will cut the magnetic field again, thereby generating an induced electromotive force. The induced electromotive force generated by the passive coil 1321 is then collected by the first voltage sampling circuit 1322; based on the induced electromotive force, the magnetic field change of the magnetic adsorption component can be determined, and the situation of the adsorbed first magnetic particles can be obtained. At this point, the detection of the first magnetic particles is completed.

[0150] After the first magnetic particles in the conductive liquid are adsorbed, the remaining second magnetic particles continue to flow with the conductive liquid in the liquid transmission pipeline 11, and are discharged into the insulating tank 12 through the liquid discharge port of the liquid transmission pipeline 11. The first electrode and the second electrode of the first power supply 141 are respectively immersed in different positions in the conductive liquid in the insulating tank 12, so that the conductive liquid in the insulating tank 12 is energized. The two ends of the sampling coil 1421, as the two ends of the voltage detection component, are respectively immersed in different positions in the conductive liquid in the insulating tank 12, so as to obtain the voltage change in the conductive liquid. When the second magnetic particles enter the conductive liquid in the insulating tank 12, the resistance of the conductive liquid changes, thereby causing the voltage to change. The voltage change of the sampling coil 1421, that is, the voltage change in the conductive liquid in the insulating tank 12, can be collected through the second voltage sampling circuit 1422 connected in parallel with the sampling coil 1421. Then, based on the voltage change, the number and size of weak magnetic particles in the conductive liquid in the insulating tank 12 are determined.

[0151] The above embodiment provides a slurry detection device for detecting particles in battery slurry. In practical applications, in order to efficiently detect, the slurry detection device is generally arranged in a slurry coating system to detect the battery slurry in the slurry coating system.

[0152] Based on the above slurry detection device, the embodiment of the present application further provides a slurry coating system, which specifically includes a coating device, a slurry processing device, a particle conveying device, and the slurry detection device in the above embodiment, etc. This embodiment describes the slurry coating system in detail in conjunction with the accompanying drawings. Figure 7 This is a schematic diagram of a slurry coating system provided in some embodiments of the present application. Figure 7 As shown, it includes a coating device 710, a slurry processing device 720, a particle conveying device 730, and a liquid transmission pipeline 11 and an insulating groove 12 in the slurry detection device.

[0153] The coating device 710 includes: a first storage tank 7101 for containing battery slurry; the first storage tank includes a first tank body and a first interface connected to the first tank body, and the coating device is used to apply the battery slurry to a preset position. In actual application, the coating device 710 also includes a coating valve 7102, a coating pumping device 7103, a coating pipeline pressure gauge 7104, and a coating feeler 7105, etc., for completing the coating operation.

[0154] The slurry processing device 720 is used to take out a preset amount of battery slurry sample from the first storage tank 7101 through the first interface, and clean and filter the battery slurry sample to obtain the cleaned and filtered target particles. The particle conveying device 730 is used to convey the target particles in the slurry processing device 720 to the liquid transmission pipeline 11 of the slurry detection device, and finally discharge them into the insulation tank 12.

[0155] The first storage tank 7101 in the coating device 710 of this embodiment is used to temporarily store battery slurry, which is the battery slurry to be used. In order to detect it, it is necessary to sample it through the first interface. The caliber size of the first interface can be set according to the sampling amount requirements, and it is necessary to ensure the accuracy of the sampling amount while ensuring the sampling speed.

[0156] After the battery slurry sample is taken out, it is sent to the slurry processing device through the first interface to clean and filter the battery slurry sample to obtain target particles. The target particles are then transported to the slurry detection device through the particle conveying device to complete the detection of the target particles.

[0157] The slurry processing device needs to complete the sampling and cleaning of the battery slurry sample. When sampling, the slurry processing device can take out a preset amount of battery slurry sample from the first storage tank 7101 by extraction; or a height difference can be set to set the first storage tank 7101 at a higher position to directly take out the battery slurry sample by gravity. When cleaning and filtering the battery slurry sample, it is necessary to retain larger target particles, and the battery slurry itself and smaller particles need to be filtered out. Therefore, components such as filters can be used to retain target particles larger than a certain specification.

[0158] The particle conveying device is mainly used to transfer the target particles, and can deliver the target particles extracted by the slurry processing device into the liquid transmission pipeline 11 by means of wind blowing or solution flushing.

[0159] The embodiment of the present application can realize real-time online monitoring of battery slurry through the slurry processing unit and the detection unit, without the need for manual sampling and detection, thus solving the problem of data lag after exceeding the standard, and being able to discover problems in time and prevent them in advance, which is conducive to improving production efficiency.

[0160] As mentioned above, the slurry processing device is used to complete the sampling and cleaning of the battery slurry. This embodiment provides a sampling device for sampling. Figure 7 As shown, the sampling device includes a first pipeline assembly, a second storage tank 7201, a filtering device 7202, a second pumping device 7203 and a waste liquid container 7204.

[0161] The first pipeline assembly includes a first pipeline and a second pipeline. The second storage tank 7201 includes a second tank body, a second interface connected to the second tank body, and a third interface, the second interface is connected to the first interface; the third interface is connected to one end of the first pipeline. The first liquid inlet of the filter device 7202 is connected to the other end of the first pipeline, and the first liquid outlet of the filter device 7202 is connected to one end of the second pipeline; the filter device 7202 is used to filter the battery slurry to obtain the target particles in the battery slurry. The second pumping device 7203 is located in the second pipeline and provides power to make the waste liquid flowing out of the filter device 7202 flow to the waste liquid container 7204 via the second pipeline.

[0162] The specific structures of the above components are not limited. The second interface of the second storage tank 7201 is connected to the first interface of the first storage tank 7101 for obtaining the battery slurry sample, and the second tank body is used to temporarily store the sampled battery slurry sample. The specific acquisition method is not limited, and the battery slurry can be extracted by a pumping device; or a height difference can be set between the second storage tank 7201 and the first storage tank 7101, so that the battery slurry in the first storage tank 7101 flows to the second storage tank 7201 under the influence of gravity, and can be controlled by a valve.

[0163] The second storage tank 7201 is used to store a preset amount of battery slurry sample. For accurate sampling, a scale can be set on the second storage tank 7201, and sampling is stopped after reaching the set scale. For example, two liquid levels, a low liquid level L and a high liquid level H, can be calibrated on the storage tank, and different preset amounts of battery slurry samples can be obtained under two different conditions.

[0164] The third interface of the second storage tank 7201 is connected to the filtering device 7202 through the first pipeline, and the battery slurry sample is sent into the filtering device 7202 for filtration to obtain target particulate matter.

[0165] The filter device 7202 is generally provided with a filter element to extract the target particles, and the size of the filter mesh can be selected according to the specifications of the target particles. In addition, the filter meshes of different sizes can be replaced according to the specifications of the target particles measured each time. In addition, in order to collect the waste liquid, the present embodiment further provides a waste liquid container 7204, and the cleaning waste liquid generated in the filter device 7202 is sent to the waste liquid container 7204 through the second pumping device 7203.

[0166] Through this sampling device, operations such as sampling and filtering of battery slurry can be completed quickly, and waste liquid can be transported to the waste liquid container 7204 to achieve waste liquid recovery.

[0167] A cleaning device for cleaning a battery slurry sample in a slurry processing device is provided herein. Figure 7As shown, the cleaning device includes a second pipeline assembly, a cleaning liquid container 7205 and a third pumping device 7206.

[0168] The second pipeline assembly includes a third pipeline, one end of which is connected to the second liquid inlet of the filter device 7202; the other end of the third pipeline is connected to the cleaning liquid container 7205. The third pumping device 7206 is located in the third pipeline and provides power to make the solution in the cleaning liquid container 7205 flow into the filter device 7202 via the third pipeline.

[0169] In this embodiment, the third pumping device 7206 in the cleaning device can extract the required cleaning liquid, thereby realizing the cleaning operation of the battery slurry sample in the filtering device 7202. The structure is simple, the implementation is convenient, and the cleaning effect is good.

[0170] In practical applications, multiple valves can be set to improve the controllability of the entire system. Figure 7 As shown, a first valve 7207 is provided in the pipeline between the first storage tank 7101 and the second storage tank 7201, and / or a second valve 7208 is provided on the second pipeline.

[0171] As mentioned above, the height difference can be set for the first valve 7207, and the first storage tank 7101 can be set at a higher position to directly take out the battery slurry sample by gravity. In order to control the sample amount of the battery slurry sample taken, the first valve 7207 is set on the sampling pipeline in the embodiment of the present application, and the first valve 7207 is opened when sampling is required, and the first valve 7207 is closed after the preset amount of battery slurry sample is taken. In practical applications, the battery slurry sample can also be extracted by a pumping device, but there is a large error in the sample amount extracted by the pumping device, and the sample amount can also be controlled by the first valve 7207.

[0172] As for the second valve 7208, since the cleaning of the battery slurry sample needs to be completed, if the cleaning liquid is simply allowed to flow through the battery slurry sample, the cleaning effect may not be ideal and a large amount of cleaning liquid may be consumed. Therefore, when the cleaning liquid enters the filter device 7202, the second valve 7208 can be closed first, and after the cleaning liquid contacts the battery slurry sample for a period of time, the second valve 7208 can be opened to discharge the waste liquid.

[0173] Similarly, if Figure 7 As shown, in order to improve controllability, a third valve 7209 can be added to the third pipeline of the second pipeline assembly. The second pipeline assembly is used to pump the cleaning liquid in the cleaning liquid container 7205 to the filter device 7202 through the third pipeline. The third valve 7209 is added to the third pipeline to accurately control the amount of the cleaning liquid.

[0174] In addition, a first pressure gauge 7210 may be provided on the third pipeline, and a second pressure gauge 7211 may be provided on the second pipeline, so as to obtain the liquid pressure data in the pipeline and realize more precise control.

[0175] In addition, in addition to the above effects, in actual applications, in order to reduce the number of interfaces and pipelines, each pipeline may have a common part, and by setting a valve, the corresponding pipeline can be opened at the corresponding time. The embodiment of the present application controls the conduction of the corresponding pipelines through the first valve 7207 and the second valve 7208 respectively, thereby realizing precise control of the sampling device; and controls the conduction of the third pipeline through the third valve 7209, thereby realizing precise control of the cleaning device; thereby improving the controllability of the entire system.

[0176] This embodiment also provides a specific structure of a particle conveying device, such as Figure 7 As shown, the particle conveying device 730 includes a liquid storage tank 7301 and a first pumping device 7303. The first pumping device 7303 is used to extract the solution in the liquid storage tank 7301 to flush the target particles after cleaning and filtration in the slurry processing device 720 into the liquid transmission pipeline 11 through the solution.

[0177] In addition, as an optional example, a third pressure gauge 7304 and a fourth valve 7302 can be set on the pipeline between the liquid storage tank 7301 and the particle conveying device 730. The third pressure gauge 7304 can obtain the liquid pressure data in the pipeline, and the fourth valve 7302 can control the conduction of the pipeline, thereby achieving more precise control.

[0178] For the rigor of the detection, the solution in the liquid storage tank 7301 is usually the conductive liquid mentioned above. At the initial moment, the liquid transmission pipeline 11 may not contain conductive liquid, or may contain a small amount of conductive liquid. After the conductive liquid in the liquid storage tank 7301 is flushed into the liquid transmission pipeline 11, its resistance will not be affected.

[0179] During the flushing process, sufficient flushing time and flushing pressure are required to ensure that the target particles in the slurry processing device are flushed into the liquid transmission pipeline 11 as much as possible. The flushing time of the first pumping device 7303 can be pre-set based on the sampling volume of the battery slurry to ensure the flushing effect; the first pumping device 7303 can also be stopped after the target particles are completely flushed through manual observation.

[0180] Through the first pumping device 7303 provided in the embodiment of the present application, the solution in the liquid storage tank 7301 can be extracted, and the target particles can be flushed from the slurry processing device into the liquid transmission pipeline 11, thereby efficiently completing the transfer of the target particles.

[0181] The slurry coating system provided in the embodiment of the present application can not only complete the normal coating process through the coating device 710, but also complete the sampling and cleaning of the battery slurry based on the slurry processing device to obtain the target particles, and then deliver the target particles into the liquid transmission pipeline 11 through the particle conveying device; finally, the target particles are detected through the slurry detection device.

[0182] like Figure 7 As shown, in actual application, a fifth valve 740 may be provided between the particle conveying device and the liquid transmission pipeline 11 to control the conduction of the pipeline between the two. In addition, a pipeline may also be provided between the waste liquid container 7204 and the second storage tank 7201, and the excess waste liquid in the second storage tank 7201 may be discharged into the waste liquid container 7204. A sixth valve 7212 may be provided on the pipeline between the waste liquid container 7204 and the second storage tank 7201 to control the conduction of the pipeline.

[0183] This system can be operated manually or fully automatically. The entire slurry coating system is automatically controlled by a programmable logic controller, and the detection time can be freely set to regularly detect the particle condition of the battery slurry. By controlling each valve and each pumping device, the sampling, cleaning and pumping processes are completed. Finally, after the slurry detection device obtains the test results, it can also send the test results to the programmable logic controller, which will issue an early warning to remind that there is an abnormality in the particle condition of the battery slurry.

[0184] by Figure 7 Taking the slurry coating system structure shown as an example, a complete process of sampling a battery slurry to obtain target particles and flushing the target particles to a liquid transmission pipeline 11 is provided herein.

[0185] First, open the first valve 7207, and the battery slurry in the first storage tank 7101 enters the second storage tank 7201 through the pipeline where the first valve 7207 is located, and close the first valve 7207 after taking enough battery slurry samples. The battery slurry sample enters the filter device 7202 through the first pipeline. At this time, open the third valve 7209, and the third pumping device 7206 extracts the cleaning liquid in the cleaning liquid container 7205 to the filter device 7202 to complete the cleaning and filtration of the battery slurry sample in the filter device 7202. After the cleaning is completed, it is necessary to close the third valve 7209, open the second valve 7208, and discharge the cleaned waste liquid into the waste liquid container 7204 through the second pumping device 7203. This cleaning process may be repeated multiple times, and the second valve 7208 and the third valve 7209 may be opened at the same time for cleaning. At this point, the target particles in the filter device 7202 are obtained. Keep the second valve 7208 and the third valve 7209 closed.

[0186] Then, a flushing process is performed, the fourth valve 7302 and the fifth valve 740 are opened, the first pumping device 7303 extracts the liquid in the liquid storage tank 7301, and flushes the target particles of the filtering device 7202 to the liquid transmission pipeline 11.

[0187] On the other hand, an embodiment of the present application further provides a slurry detection method, which is applied to the slurry detection device in the above embodiment. Figure 8 The following is a flow chart of a slurry detection method provided in some embodiments of the present application. Figure 8 As shown, the method comprises the following steps:

[0188] S801: During the flow of the conductive liquid in the liquid transmission pipeline, the magnetic field change of the magnetic adsorption component is detected by the magnetic field detection component, and the voltage change of the conductive liquid in the insulating groove is detected by the voltage detection component;

[0189] S802: Determine the first magnetic particles in the battery slurry to be detected based on the change of the magnetic field of the magnetic adsorption component; and determine the second magnetic particles in the battery slurry based on the change of the voltage of the conductive liquid in the insulating tank.

[0190] The method provided in the embodiment of the present application corresponds to the slurry detection device in the above embodiment, so the specific same embodiments and beneficial effects of the two are not repeated here.

[0191] As mentioned above, in order to obtain the situation of the first magnetic particles, it is necessary to obtain the magnetic field changes of the magnetic adsorption component. The most representative parameter of the magnetic field changes is the magnetic flux change. Since it is difficult to detect the magnetic flux change caused by a single first magnetic particle, in practical applications, the actual magnetic flux change of the magnetic adsorption component as a whole can be directly obtained. This actual magnetic flux change corresponds to all the first magnetic particles in the conductive liquid.

[0192] However, this device is usually used to detect larger target particles. The sizes of the first magnetic particles to be detected are similar. Therefore, the changes in magnetic flux caused by the first magnetic particles can be regarded as approximately equal, thereby completing the counting of the first magnetic particles. As a feasible implementation scheme, the magnetic field change of the magnetic adsorption component is specifically the actual change in magnetic flux; and the first magnetic particle situation includes the number of the first magnetic particles.

[0193] Based on the change of the magnetic field of the magnetic adsorption component, the situation of the first magnetic particles in the battery slurry to be detected is determined, including: obtaining the baseline change of the magnetic flux of the magnetic adsorption component after a single first magnetic particle is adsorbed by the magnetic adsorption component, and determining the number of the first magnetic particles based on the actual change of the magnetic flux and the baseline change of the magnetic flux.

[0194] As a feasible implementation method, the solenoid (110-220V / AC) is energized to generate a magnetic field to adsorb the first magnetic particles in the pipeline. When the first magnetic particles are adsorbed to the solenoid, the magnetic field around the coil changes, and this change causes the voltage read in the passive coil to change. This is because the change in the magnetic field can induce an electromotive force, that is, an induced electromotive force. According to the electromagnetic induction phenomenon, when the magnetic flux passing through the solenoid changes, the solenoid generates an electromotive force. Therefore, when the first magnetic particle is adsorbed to the solenoid, the magnetic field distribution around the coil is changed, and then the magnetic flux passing through the solenoid is changed, resulting in an electromotive force in the coil, which causes the voltage to change.

[0195] The formula for induced electromotive force is: ε=-NdΦ / dt. N is the number of coil turns, Φ is the magnetic flux, and t is the time. The magnetic flux can be calculated by the formula Φ=B×A, where B is the magnetic induction intensity and A is the area. The change in magnetic flux is related to time. By dividing the change in magnetic flux by time, the rate at which the magnetic flux changes over time can be obtained. The larger this ratio is, the faster the magnetic flux changes.

[0196] The calculation formula of the magnetic flux corresponding to a single first magnetic particle is Φ=B×A, where Φ represents the magnetic flux, B represents the magnetic induction intensity, and A represents the cross-sectional area perpendicular to the magnetic field.

[0197] After the device is operated, the induced electromotive force is obtained, and then the actual change in magnetic flux NS is determined, and then it is analyzed whether the number of first magnetic particles exceeds the standard (for example, the Dφ value corresponding to a single first magnetic particle with a diameter of 25um-75um is S, and the actual change in magnetic flux NS is divided by the value S corresponding to a single particle to obtain the number of first magnetic particles.

[0198] This embodiment can accurately calculate the number of currently attracted first magnetic particles by predetermining the reference change in magnetic flux caused by the attraction of a single first magnetic particle and then comparing the actual change in magnetic flux with the reference change in magnetic flux.

[0199] The above provides a solution for determining the situation of the first magnetic particles, and in actual applications, the second magnetic particles need to be detected based on the voltage change of the conductive liquid in the insulating groove. At this time, the number of voltage changes is easy to count, and the number of second magnetic particles entering the insulating groove each time can be controlled, and the number of second magnetic particles can be determined by the number of voltage changes. Furthermore, the size of the second magnetic particles can also be determined by the intensity of the voltage change.

[0200] As a feasible implementation method, the voltage change of the conductive liquid in the insulating tank includes the number of voltage mutation signals and the signal strength; the second magnetic particle situation includes the number and size of the second magnetic particles. Based on the voltage change of the conductive liquid in the insulating tank, the second magnetic particle situation in the battery slurry is determined, including: determining the number of the second magnetic particles based on the number of signals, and determining the size of the second magnetic particles based on the signal strength.

[0201] For example, the liquid transmission pipeline can be limited to discharge only one second magnetic particle into the insulating groove at a time. Then, each time a voltage mutation signal is detected, the count of the second magnetic particles is increased by one. The size of the second magnetic particle can also be determined by the intensity of the detected voltage mutation signal.

[0202] For example, the formula R=ρL / s, where R is the resistance of the particle, ρ is the resistivity, L is the length of the particle, and S is the cross-sectional area of ​​the particle. For example, if the diameter of the copper particle is 1 mm (i.e. the radius is 0.5 mm), then its cross-sectional area is π×(0.5× )²=7.85× m²‌. Then the resistance can be calculated using formula (1):‌

[0203] R = ρ × L / S = 1.72 × Ω⋅m×25× m / (7.85× m²) = 0.0015Ω (1)

[0204] The resistance of the copper particle can be estimated to be 0.00075Ω. The particle size can be inferred in this way. After determining the size of the voltage mutation signal in the conductive liquid, the particle resistance can be calculated, and then the particle size and other information can be determined.

[0205] As a feasible embodiment, in the insulating tank, an alternating power supply is used to provide a constant current to the conductive liquid, and detection is performed according to Ohm's law U=RI. For example, the current is set to 10mA, the copper particle with a diameter of 50um is 0.00075Ω, and the voltage signal is 0.0075mV. The voltage is collected to obtain the voltage signal of a single copper particle. Since the liquid transmission pipeline (the flow rate can be set) only discharges the conductive liquid into the insulating tank, a stable voltage signal will be generated. If there is a sudden voltage signal, it means that the liquid contains the second magnetic particles, and it is counted once.

[0206] In this implementation, when the second magnetic particles enter the conductive liquid in the insulating slot, a voltage mutation signal is generated between the first electrode and the second electrode due to the change in resistance in the conductive liquid. Based on the number of voltage mutation signals, the number of second magnetic particles entering the conductive liquid can be determined; and based on the signal strength of the voltage mutation signal, the size of the second magnetic particles can be determined. It can be seen that this solution can accurately know the size and number of the second magnetic particles, so as to analyze the particle situation of the battery slurry.

[0207] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0208] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0209] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0210] The above describes various aspects of the present application with reference to the flowchart and / or block diagram of the method, device (system) according to the embodiment of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0211] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slurry detection device, characterized in that: include: A liquid transmission pipeline, an insulating tank, a first particle detection assembly, and a second particle detection assembly; The liquid transmission pipeline is used to transmit the conductive liquid containing the target particles; The resistance of the target particles is different from that of the conductive liquid, and the target particles are obtained by filtering a preset amount of battery slurry; one end of the liquid transmission pipeline is placed inside the insulating tank to discharge the conductive liquid into the insulating tank; The first particle detection component comprises: A magnetic adsorption component is arranged at the periphery of the liquid transmission pipeline and is used to adsorb first magnetic particles in the target particles flowing in the liquid transmission pipeline to change its own magnetic field; A magnetic field detection component is arranged beside the magnetic adsorption component and is used to detect the change of the magnetic field of the magnetic adsorption component to determine the condition of the first magnetic particles in the battery slurry; The second particle detection component comprises: a first power source, wherein a first electrode and a second electrode of the first power source are respectively immersed in different positions in the conductive liquid in the insulating tank; A voltage detection component, wherein both ends of the voltage detection component are immersed in different positions in the conductive liquid in the insulating tank, and is used to detect the voltage change of the conductive liquid in the insulating tank when the first power supply is powered on, so as to determine the situation of the second magnetic particles in the battery slurry.

2. The slurry detection device according to claim 1, characterized in that: Also includes: processor; The processor is connected to the magnetic field detection component and is used to determine the first magnetic particles in the battery slurry based on the magnetic field change of the magnetic adsorption component; The processor is also connected to the voltage detection component and is used to determine the second magnetic particles in the battery slurry based on the voltage change of the conductive liquid in the insulating tank; The processor is also used to determine an abnormal condition of particles in the battery slurry according to the first magnetic particle condition and the second magnetic particle condition.

3. The slurry detection device according to claim 2, characterized in that: The processor is connected to the lower computer; The processor is also used to: when it is determined that there is an abnormality in the particles in the battery slurry, output an alarm message to the lower computer.

4. The slurry detection device according to any one of claims 1 to 3, characterized in that: The magnetic adsorption component comprises: A solenoid, surrounding the periphery of the liquid transmission pipeline; when the solenoid is energized, the first magnetic particles passing through the solenoid are adsorbed; A second power supply, wherein two poles of the second power supply are connected to two ends of the solenoid, and are used to energize the solenoid.

5. The slurry detection device according to claim 4, characterized in that: The magnetic field detection component comprises: a passive coil, the passive coil being arranged side by side with the solenoid to generate an induced electromotive force based on a change in a magnetic field of the solenoid; The first voltage sampling circuit is connected in parallel with the passive coil and is used to collect the induced electromotive force; so as to determine the change of the magnetic field of the magnetic adsorption component based on the induced electromotive force.

6. The slurry detection device according to claim 5, characterized in that: The first particle detection component also includes: A shielding cover is located outside the magnetic adsorption component and the magnetic field detection component and is used for shielding external electromagnetic signals.

7. The slurry detection device according to any one of claims 1 to 3, characterized in that: The voltage detection component comprises: A sampling coil, wherein two ends of the sampling coil are respectively immersed in different positions of the conductive liquid in the insulating tank; The second voltage sampling circuit is connected in parallel with the sampling coil and is used to collect the voltage change of the sampling coil to determine the voltage change of the conductive liquid in the insulating groove based on the voltage change of the sampling coil.

8. The slurry detection device according to claim 7, characterized in that: The second particle detection component also includes: A first voltage dividing module, wherein the first voltage dividing module is connected in series with the first power supply; A second voltage dividing module is connected in series with the sampling coil.

9. A slurry coating system, characterized in that: include: A coating device, a slurry processing device, a particle conveying device, and a slurry detection device according to any one of claims 1 to 8; The coating device comprises: a first storage tank for containing battery slurry; The first storage tank includes a first tank body and a first interface connected to the first tank body, and the coating device is used to coat the battery slurry to a preset position; The slurry processing device is used to take out a preset amount of battery slurry sample from the first storage tank through the first interface, and wash and filter the battery slurry sample to obtain the target particulate matter after washing and filtering; The particle conveying device is used to convey the target particles in the slurry processing device to the liquid transmission pipeline of the slurry detection device.

10. The slurry coating system according to claim 9, characterized in that: The particle conveying device includes a liquid storage tank and a first pumping device, wherein the first pumping device is used to extract the solution in the liquid storage tank so as to flush the target particles after cleaning and filtration in the slurry processing device into the liquid transmission pipeline through the solution.

11. The slurry coating system according to claim 9 or 10, characterized in that: The slurry processing device includes a sampling device; The sampling device comprises a first pipeline assembly, a second storage tank, a filtering device, a second pumping device and a waste liquid container; The first pipeline assembly includes a first pipeline and a second pipeline; The second storage tank comprises a second tank body, a second interface communicating with the second tank body, and a third interface, wherein the second interface is connected with the first interface; The third interface is connected to one end of the first pipeline; The first liquid inlet of the filtering device is connected to the other end of the first pipeline, and the first liquid outlet of the filtering device is connected to one end of the second pipeline; the filtering device is used to filter the battery slurry to obtain the target particles in the battery slurry; The second pumping device is located in the second pipeline and provides power to make the waste liquid flowing out of the filtering device flow to the waste liquid container via the second pipeline.

12. The slurry coating system according to claim 11, characterized in that: The pipeline between the first storage tank and the second storage tank further includes a first valve, and / or the second pipeline further includes a second valve.

13. The slurry coating system according to claim 11, characterized in that: The slurry processing device further comprises: a cleaning device; the cleaning device comprises a second pipeline assembly, a cleaning liquid container and a third pumping device; The second pipeline assembly includes a third pipeline, one end of which is connected to the second liquid inlet of the filter device; the other end of which is connected to the cleaning liquid container; The third pumping device is located in the third pipeline and provides power to make the solution in the cleaning liquid container flow into the filtering device through the third pipeline.

14. The slurry coating system according to claim 13, characterized in that: The second pipeline assembly further includes: a third valve arranged on the third pipeline.

15. A slurry detection method, characterized in that: The slurry detection device applied to any one of claims 1 to 8; the method comprises: During the flow of the conductive liquid in the liquid transmission pipeline, the magnetic field change of the magnetic adsorption component is detected by the magnetic field detection component, and the voltage change of the conductive liquid in the insulating groove is detected by the voltage detection component; Based on the change of the magnetic field of the magnetic adsorption component, the first magnetic particles in the battery slurry to be detected are determined; and based on the change of the voltage of the conductive liquid in the insulating tank, the second magnetic particles in the battery slurry are determined.

16. The slurry detection method according to claim 15, characterized in that: The magnetic field change of the magnetic adsorption component includes the actual change of magnetic flux; the first magnetic particle condition includes the number of first magnetic particles; The determining of the first magnetic particle condition in the battery slurry to be detected based on the magnetic field change of the magnetic adsorption component includes: Acquiring a reference change amount of the magnetic flux of the magnetic adsorption component after a single first magnetic particle is adsorbed by the magnetic adsorption component; The number of the first magnetic particles is determined based on the actual change in the magnetic flux and the reference change in the magnetic flux.

17. The slurry detection method according to claim 15 or 16, characterized in that: The voltage change of the conductive liquid in the insulating groove includes the number and signal strength of the voltage mutation signal; the second magnetic particle condition includes the number and size of the second magnetic particles; The determining of the second magnetic particles in the battery slurry based on the voltage change of the conductive liquid in the insulating groove comprises: The number of the second magnetic particles is determined based on the number of signals, and the size of the second magnetic particles is determined based on the signal intensity.

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