Slurry detection device and method and slurry coating system

Abstract

The invention discloses a slurry detection device and method and a slurry coating system, and relates to the technical field of batteries. The conductive liquid and the target particulate matter filtered from the battery slurry sample are accommodated in the insulating groove, and the liquid and the target particulate matter in the insulating groove can flow into the hole pipe through the hole under the condition that the internal pressure of the hole pipe is greater than the external pressure. When target particles enter the hole pipe through the hole, a voltage pulse signal is generated. At the moment, the voltage sampling circuit connected in parallel with the direct-current power supply can detect the voltage pulse signal, and then the particle condition in the battery slurry can be determined according to the voltage pulse signal. Therefore, according to the slurry detection device provided by the embodiment of the invention, the particle condition of the battery slurry can be directly determined through the collected voltage pulse signal, manual observation and analysis through a microscope are not needed, the production efficiency is improved, and the potential safety hazard is reduced.

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 is inefficient, and the data lags greatly after magnetic material particles exceed the standard, which restricts production efficiency and causes particles to exceed the standard, 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 monitoring magnetic substances in battery slurry to ensure production safety.

[0005] In a first aspect, the present application provides a slurry detection device, comprising: an insulating slot and a detection component; The insulating tank is used to contain a conductive liquid and target particles dispersed in the conductive liquid; the target particles are obtained by filtering a preset amount of battery slurry sample, and the conductivity of the conductive liquid is different from the conductivity of the target particles; The detection component comprises: A hole having a preset aperture at one end of the hole tube and immersed in the conductive liquid in the insulating groove, wherein the conductive liquid is discharged from the insulating groove through the other end of the hole tube; the preset aperture is set based on the size of the target particle; A direct current power supply, wherein a first electrode and a second electrode of the direct current power supply are both immersed in the conductive liquid, and one of the first electrode and the second electrode is located inside the orifice tube, and the other is located outside the orifice tube; A voltage sampling circuit, the voltage sampling circuit is connected in parallel with the DC power supply; it is used to detect a voltage pulse signal generated between the first electrode and the second electrode when the target particles pass through the orifice tube after the first electrode and the second electrode are energized; so as to determine the particle status in the battery slurry based on the voltage pulse signal.

[0006] In the slurry detection device in the embodiment of the present application, a conductive liquid and target particles filtered from a battery slurry sample are contained in the insulating groove, and when the pressure inside the orifice tube is greater than the external pressure, the liquid and target particles in the insulating groove can flow into the orifice tube through the hole. After the first electrode and the second electrode of the DC power supply are energized, an electric sensitive area is formed between the first electrode and the second electrode. When target particles enter the orifice tube through the hole, the voltage between the first electrode and the second electrode changes due to the different electrical conductivities of the conductive liquid and the target particles, and a voltage pulse signal is generated. At this time, the voltage sampling circuit connected in parallel with the DC power supply can detect the voltage pulse signal, and then the particle situation in the battery slurry can be determined based on the voltage pulse signal.

[0007] In this way, the slurry detection device provided in the embodiment of the present application can directly determine the particle situation of the battery slurry through the collected voltage pulse signal, without the need for manual observation and analysis through a microscope, which is beneficial to improving production efficiency, improving product quality and reducing safety hazards.

[0008] In a possible implementation, the detection component further includes: a processor; The processor is connected to the voltage sampling circuit, and is used to determine the number of the target particles in the conductive liquid according to the number of pulses of the voltage pulse signal, and / or to determine the particle size of the corresponding target particles according to the voltage magnitude of the voltage pulse signal; The processor is also used to determine whether the particle condition in the battery slurry is abnormal according to the number of the target particles and / or the particle size in the conductive liquid.

[0009] Through the technical solution of this implementation method, the processor analyzes the pulse number and voltage size of the voltage pulse signal to determine the number and size of particles, thereby accurately understanding whether the particles in the battery slurry are abnormal.

[0010] In a possible implementation, the processor is connected to a lower computer; The processor is also used to: when it is determined that the particles in the battery slurry are abnormal, output alarm information to the lower computer.

[0011] In a possible implementation, the detection component further includes: a voltage divider module connected in series with the DC power supply.

[0012] In a possible implementation, the slurry detection device further includes: a stirring device, configured to stir the conductive liquid in the insulating tank.

[0013] In this implementation, the stirring device is used to stir the conductive liquid, which can prevent the target particles from settling and becoming undetectable, thereby ensuring the accuracy of the detection.

[0014] In a possible implementation, the slurry detection device further includes: a shielding cover disposed around the insulating groove and the detection component.

[0015] In this implementation, the shielding cover can shield the impact of peripheral equipment on the target particles and avoid interference from external factors, thereby ensuring the accuracy of detection.

[0016] 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; 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; 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 insulating groove of the slurry detection device.

[0017] 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 insulating tank through the solution.

[0018] In this implementation, the solution in the liquid storage tank can be extracted through the first pumping device, and then the target particles are flushed from the slurry processing device into the insulating tank using the solution, thereby efficiently completing the transfer of the target particles.

[0019] In a possible implementation, 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 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; 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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; 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.

[0024] 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.

[0025] In a possible implementation, the second pipeline assembly further includes: a third valve disposed on the third pipeline.

[0026] 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.

[0027] 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: After the first electrode and the second electrode of the DC power supply are powered on, a voltage pulse signal generated between the first electrode and the second electrode when the target particle passes through the orifice tube is collected by a voltage sampling circuit; Based on the voltage pulse signal, the particle condition in the battery slurry to be detected is determined.

[0028] In a possible implementation, determining the particle condition in the battery slurry to be detected based on the voltage pulse signal includes: Obtaining the pulse number and voltage magnitude of the voltage pulse signal; Determining the number of particles of the target particulate matter in the conductive liquid according to the number of pulses of the voltage pulse signal; Determining the particle size of the target particles in the conductive liquid according to the voltage magnitude of the voltage pulse signal; Whether the particle condition in the battery slurry to be detected is abnormal is determined based on the particle size and / or the particle quantity of the target particle in the conductive liquid.

[0029] In a possible implementation, determining the particle size of the target particles in the conductive liquid according to the voltage magnitude of the voltage pulse signal includes: The particle size of the target particles in the conductive liquid is determined according to the voltage of the voltage pulse signal, the resistivity of the conductive liquid, the size of the preset aperture, and the current generated by the DC power supply.

[0030] In this implementation, a correspondence between the voltage magnitude of the voltage pulse signal and the particle size of the target particle is established based on various parameters, so that after the voltage magnitude of the voltage pulse signal is obtained, the particle size of the target particle can be quickly determined.

[0031] 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

[0032] 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: Figure 1 A schematic structural diagram of a first slurry detection device provided in some embodiments of the present application; Figure 2 A schematic structural diagram of a second slurry detection device provided in some embodiments of the present application; Figure 3 A schematic structural diagram of a third slurry detection device provided in some embodiments of the present application; Figure 4 A schematic structural diagram of a fourth slurry detection device provided in some embodiments of the present application; Figure 5 A schematic structural diagram of a fifth slurry detection device provided in some embodiments of the present application; Figure 6 A schematic diagram of a slurry coating system provided in some embodiments of the present application; Figure 7 A schematic flow chart of a slurry detection method provided in some embodiments of the present application. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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).

[0039] 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.

[0040] As mentioned in the background technology, the battery slurry may contain single substances such as Fe, Ni, Zn, Cr and Cu, as well as metal particles such as some alloys and oxides. When there are many or large particles of these metals, serious safety hazards may occur.

[0041] The traditional method for detecting these metal particles in the battery slurry is usually to manually take samples and perform a series of pretreatments before observing them under a microscope to obtain the results. This method is not only inefficient, but the results of microscopic observations are also subjective and the test results are not accurate. As a result, it is impossible to accurately detect metal particles of different sizes in the battery slurry. The low efficiency and inaccurate test results will lead to the inability to promptly detect abnormal particles in the battery slurry, which may lead to safety accidents.

[0042] In response to the above technical problems, the study found that the presence of magnetic particles in the battery slurry will cause the electric field to change. Based on this, a device that can detect the voltage signal generated by the movement of magnetic particles in the battery slurry can be designed, and then the particle situation in the battery slurry can be determined based on the voltage signal.

[0043] 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 1The schematic diagram of the structure of the first slurry detection device provided in some embodiments of the present application. Figure 1 As shown, the device mainly includes two parts: an insulating tank 101 and a detection component 102. The insulating tank 101 is used to contain the conductive liquid and the target particles dispersed in the conductive liquid. The detection component 102 mainly includes a hole tube 103, a DC power supply 104 and a voltage sampling circuit 105.

[0044] A hole 106 of a preset aperture is provided at one end of the orifice tube 103 and is immersed in the conductive liquid in the insulating tank 101. The conductive liquid is discharged from the insulating tank 101 through a drain port 107 at the other end of the orifice tube 103. The preset aperture is set based on the size of the target particles. The first electrode and the second electrode of the DC power supply 104 are both immersed in the conductive liquid, and one of them is located inside the orifice tube 103, and the other is located outside the orifice tube 103; The voltage sampling circuit 105 is connected in parallel with the DC power supply 104; it is used to detect the voltage pulse signal generated between the first electrode and the second electrode when the target particles pass through the orifice tube 103 after the first electrode and the second electrode are powered on; so as to determine the particle situation in the battery slurry based on the voltage pulse signal; The insulating groove 101 may be provided with a liquid inlet 108 , and the conductive liquid may enter the insulating groove 101 through the liquid inlet 108 .

[0045] The insulating slot 101 and the detection assembly 102 are described below respectively.

[0046] The material of the insulating slot 101 is not specifically limited, and is mainly used to achieve electrical insulation, thereby ensuring the accuracy of the internal detection of target particles. The insulating slot 101 can be made of any insulating material, and in the embodiment of the present application, the shape and size of the insulating slot 101 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.

[0047] The conductive liquid can be selected according to actual needs. It needs to ensure that it can conduct electricity normally. In order to complete the voltage detection, the conductive liquid cannot react with the target particles, and the conductivity of the conductive liquid needs to be different from the conductivity of the target particles, so that the conductivity of the conductive liquid in the orifice tube 103 can change during the process of the target particles entering the hole 106 and being discharged from the other end of the orifice tube 103, thereby causing the voltage between the first electrode and the second electrode of the DC power supply 104 to change. As an example, the conductive liquid can be an electrolyte used to make a battery.

[0048] The target particulate matter is particulate matter with a particle size within a target range obtained by filtering a preset amount of battery slurry.

[0049] Generally, battery slurry is a key material used in the battery manufacturing process, mainly composed of active materials, conductive agents, binders and solvents. The metal particles in the battery slurry will cause adverse consequences, so the purpose of the embodiment of the present application is to detect such metal particles. Therefore, as an example of target particles, the target particles include but are not limited to single substances such as Fe, Ni, Zn, Cr and Cu, as well as some metal particles such as alloys and oxides.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] As mentioned above, one end of the orifice tube 103 is provided with a hole 106 of a preset aperture, and is immersed in the conductive liquid of the insulating tank 101, and the conductive liquid is discharged from the insulating tank 101 through the other end of the orifice tube 103. There are no requirements for the shape, size, material and installation position of the orifice tube 103. In actual applications, when the slurry detection device is used for detection, the conductive liquid containing the target particles is pre-loaded into the insulating tank 101, and in order to discharge the conductive liquid from the insulating tank 101 through the orifice tube 103, the structure and position of the orifice tube 103 need to be reasonably set.

[0054] For example, one end of the orifice tube 103 with the hole 106 can be placed at the bottom of the insulating groove 101, and the other end of the orifice tube 103 can be placed at a lower position to discharge the conductive liquid by gravity. The conductive liquid in the insulating groove 101 can also be extracted from the orifice tube 103 by applying pressure; for example, a vacuum pump is used to extract the conductive liquid through the orifice tube 103; or the other end of the orifice tube 103 is placed in a vacuum environment to complete the extraction of the conductive liquid by air pressure. In practical applications, any one or combination of the above solutions can be adopted, and other reasonable methods can also be adopted.

[0055] The preset aperture of the hole 106 is specifically set based on the size of the target particles. The appearance of a voltage pulse signal indicates that a certain number of target particles have passed through. In order to ensure the accuracy of the counting, the number of target particles passing through the hole 106 each time is generally set to 1. Then, the number of target particles in the conductive liquid is increased by 1 each time a voltage pulse signal appears.

[0056] Usually, the preset aperture can be selected from 50um, 100um and 200um, and the size range of the target particles that can pass through the hole 106 is 2%-40% of the preset aperture size. The target particles smaller than 2% of the preset aperture will be covered by noise, and the target particles larger than 40% of the preset aperture will block the hole 106. Therefore, the size of the preset aperture can be selected according to the specifications of the target particles to be measured. Since the size of the target particles generally detected is 25-75um, the hole 106 with an aperture of 200um can be selected.

[0057] In a specific implementation, a plurality of orifice tubes 103 may be prepared, each having a hole 106 of different apertures, for detection in different situations. Different orifice tubes 103 may also be used to detect the same battery slurry to improve the accuracy of detection. For example, a 100um hole 106 can pass through a target particle of 25-40um each time, while a 200um pore can pass through a target particle of 25-75um each time. When detecting target particles, the orifice tube 103 with a 200um hole 106 may be used directly, or a 100um pore may be used to perform a test first, and then a 200um hole 106 may be used to perform a test; this may make the detection of target particles more accurate.

[0058] The first electrode and the second electrode of the DC power supply 104 are both immersed in the conductive liquid, and one of them is located in the orifice tube 103, and the other is located outside the orifice tube 103. The DC power supply 104 is selected based on demand, and generally a constant current power supply needs to be selected to ensure the accuracy of the detection. The first electrode and the second electrode are respectively the positive and negative electrodes of the DC power supply 104, and the specific placement positions of the two are not limited. The positive electrode can be placed in the orifice tube 103 and close to the hole 106, and the negative electrode is placed outside the orifice tube 103. The hole 106 (close to the positive electrode) and the negative electrode of the power supply can be set at a lower position in the insulating groove 101 to avoid the inability to continue detection after the water level of the conductive liquid is lowered.

[0059] The voltage sampling circuit 105 is connected in parallel with the DC power supply 104. Based on the above description, after the first electrode and the second electrode are energized, an electric sensitive area will be formed near the hole 106. When only the conductive liquid passes through the orifice tube 103, the conductivity in the conductive liquid will be relatively stable. At this time, the first electrode and the second electrode are also relatively stable, and the voltage sampling circuit 105 obtains a stable voltage signal. When there are target particles passing through the orifice tube 103 with the conductive liquid, the conductivity in the conductive liquid in the orifice tube 103 will suddenly change, so that a voltage pulse signal is generated between the first electrode and the second electrode. The particle situation in the conductive liquid can be determined by this voltage pulse signal, and then the particle situation of all battery slurries can be derived.

[0060] In practical applications, the particle conditions of the battery slurry may specifically include the number and size of the target particles. As mentioned above, the number of target particles can be determined based on the number of pulses of the voltage pulse signal. The size of the target particles can be roughly determined based on the voltage magnitude of the voltage pulse signal; a corresponding relationship between the size of the target particles and the voltage magnitude of the voltage pulse signal can be established, for example, first obtaining the resistivity of the conductive liquid, the size of the preset aperture, and the current magnitude generated by the DC power supply 104, and then based on the voltage magnitude of the voltage pulse signal, the size of the target particles can be derived.

[0061] In order to ensure accurate counting of target particles, a sufficient amount of conductive liquid needs to be discharged. As an example of the present application, the hole 106 can be set as close to the bottom as possible in the insulating groove 101.

[0062] In addition, as another embodiment of the slurry detection device provided by the present application, on the basis of the above-mentioned slurry detection device embodiment, a stirring device can also be set in the insulating groove 101 to make the target particles in the conductive liquid evenly distributed, which can not only prevent the target particles from being undetectable, but also deduce the number of target particles in all conductive liquids by the number of target particles in the discharged conductive liquid. Because the target particles are evenly distributed in the conductive liquid, after a certain proportion of the conductive liquid is discharged, the number of target particles in all conductive liquids can be derived based on the statistical number of target particles. This method can complete the counting when all conductive liquids cannot be discharged.

[0063] 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.

[0064] In the slurry detection device in the embodiment of the present application, a conductive liquid and target particles filtered from a battery slurry sample are contained in the insulating groove, and when the pressure inside the orifice tube is greater than the external pressure, the liquid and target particles in the insulating groove can flow into the orifice tube through the hole. After the first electrode and the second electrode of the DC power supply are energized, an electric sensitive area is formed between the first electrode and the second electrode. When target particles enter the orifice tube through the hole, the voltage between the first electrode and the second electrode changes due to the different electrical conductivities of the conductive liquid and the target particles, and a voltage pulse signal is generated. At this time, the voltage sampling circuit connected in parallel with the DC power supply can detect the voltage pulse signal, and then the particle situation in the battery slurry can be determined based on the voltage pulse signal.

[0065] In this way, the slurry detection device provided in the embodiment of the present application can directly determine the particle situation of the battery slurry through the collected voltage pulse signal, without the need for manual observation and analysis through a microscope, which is beneficial to improving production efficiency, improving product quality and reducing safety hazards.

[0066] In practical applications, the number and size of target particles in battery slurry may affect production, so it is necessary to detect the number and size of target particles in battery slurry according to demand. The following describes how to determine the number and size of target particles based on the voltage pulse signal collected above.

[0067] In order to obtain the particle size and particle quantity of the target particles, a processor may be added to the detection component. A specific implementation method is provided herein. Figure 2This is a schematic diagram of the structure of a second slurry detection device provided in some embodiments of the present application. Figure 2 As shown, it includes a signal acquisition processing unit 109, a DC power supply 104, a control circuit 112, a protection resistor 113 and a filter 114. The signal acquisition processing unit 109 is specifically composed of a voltage sampling circuit 105, an operational amplifier circuit 110 and a processor 111. The signal acquisition processing unit 109 is connected to the DC power supply 104 through a signal line.

[0068] The DC power supply 104 generally uses a 15V constant current power supply. The control circuit 112 is connected to the DC power supply 104 and can adjust the voltage value of the DC power supply 104. The filter 114 is set in the circuit and can filter the impurity signal of the DC power supply 104. The protection resistor 113 is connected in series with the DC power supply 104 to protect the DC power supply 104 from short circuit.

[0069] Inside the signal acquisition processing unit 109, the processor 111 is connected to the voltage sampling circuit 105 through the operational amplifier circuit 110, and the voltage sampling circuit 105 amplifies the collected voltage pulse signal through the operational amplifier circuit 110 and sends it to the processor 111. The processor 111 is used to determine the number of target particles in the conductive liquid according to the number of pulses of the voltage pulse signal, and / or, according to the voltage magnitude of the voltage pulse signal, determine the particle size of the corresponding target particle.

[0070] As mentioned above, the number of target particles can be determined based on the number of pulses that appear in the voltage pulse signal. The hole on the orifice tube is a preset aperture size, and the preset aperture is specifically set based on the size of the target particles. Because the number of target particles needs to be determined by the voltage pulse signal, and in order to achieve counting, the number of target particles that pass through the hole each time needs to be a preset number; then the appearance of a voltage pulse signal indicates that a certain number of target particles have passed through.

[0071] The size of the target particles can be roughly determined based on the voltage of the voltage pulse signal. A corresponding relationship between the size of the target particles and the voltage of the voltage pulse signal can be established. For example, the resistivity of the conductive liquid, the size of the preset aperture, and the current generated by the DC power supply are first obtained, and then the size of the target particles can be deduced based on the voltage of the voltage pulse signal. The specific corresponding relationship can be referred to in formula (1): (1) in, is the resistivity of the conductive liquid, d is the size of the target particles, D is the diameter of the small hole, is the voltage of the voltage pulse signal, and I is the current between the first electrode and the second electrode.

[0072] The processor is also used to determine whether the particle situation in the battery slurry is abnormal based on the number and / or particle size of the target particles in the conductive liquid. For example, a quantity threshold can be set. When the number of target particles detected by the processor exceeds this quantity threshold, the particle situation is determined to be abnormal. A particle size threshold can also be set. When there are target particles larger than the particle size threshold, the particle situation is determined to be abnormal. In practical applications, any one of the above two abnormality determination schemes can be used, or the two can be combined. By setting a processor, this embodiment can complete the analysis of the number and particle size of the target particles, so as to accurately grasp whether the particle situation in the battery slurry is abnormal.

[0073] In order to improve safety, as another embodiment of the slurry battery, 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.

[0074] 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.

[0075] When an abnormality in the particle condition in the battery slurry is detected in the embodiment of the present application, an alarm message is output to a lower computer in a timely manner, thereby avoiding a safety accident.

[0076] In a specific implementation, the conductivity of the conductive liquid is generally high, and the DC power supply may have a short circuit risk. Therefore, a voltage divider module connected in series with the DC power supply can be added to the detection component. The voltage divider module can prevent the power supply from being burned out by a short circuit.

[0077] 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 voltage divider module specifically uses a protective resistor 113, which is connected in series with the DC power supply 104 in the circuit. Even if the first electrode and the second electrode of the DC power supply 104 are short-circuited, the protective resistor 113 can effectively prevent the DC power supply 104 from being short-circuited.

[0078] It is mentioned in the above embodiment that a stirring device may be further provided in the slurry detection device. 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 slurry detection device further includes a stirring device 115. The stirring device 115 is used for stirring a component placed in the conductive liquid in the insulating tank 101. The stirring device 115 generally stirs the conductive liquid in the insulating tank 101 by rotating the stirring component. The stirring device 115 stirs the conductive liquid, which can not only prevent the target particles from settling and being undetectable, but also make the target particles more evenly distributed in the conductive liquid, thereby ensuring the accuracy of the detection.

[0079] The specific position of the stirring device is not limited. In order not to affect the detection of target particles, as an example, the stirring component can be set at a position far away from the hole. Specifically, it can be at a position at a preset distance from the hole tube in the horizontal direction.

[0080] In order to ensure that the stirring device can still work after the conductive liquid level drops, the stirring component can be set at a lower position in the insulating tank; specifically, it can be set at a preset height from the bottom surface of the insulating tank, and the preset height can be determined according to the amount of conductive liquid. In addition, the working speed and working time of the stirring device need to be set according to actual conditions. It can continue to work before the detection is completed, but the working speed (such as the rotation speed of the stirring component) should not be too fast to avoid affecting the detection.

[0081] In addition, since the target particles detected in the present application are metal particles, they may be interfered by factors such as external magnetic fields. Therefore, a shielding cover may be added to the slurry detection device. 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, the slurry detection device further includes a shielding cover 116, which is disposed outside the insulating slot 101 and the detection component 102. The shielding cover 116 shields the electromagnetic signal outside the detection component to avoid the influence of the external electromagnetic signal on the detection result, thereby ensuring the accuracy of the detection.

[0082] Here, a feasible implementation method is provided, in which the conductive liquid containing the target particles enters the insulating groove 101 from the liquid inlet 108, and the stirring device 115 stirs the conductive liquid to prevent the target particles from settling. When the internal pressure of the orifice tube 103 is greater than the external pressure, the conductive liquid and the target particles in the insulating groove 101 can flow into the orifice tube 103 through the hole 106 and be discharged through the drain port 107. The DC power supply 104 is connected in series with the protective resistor 113, and the series structure is connected in parallel with the voltage sampling circuit 105. After the first electrode and the second electrode of the DC power supply 104 are energized, if the target particles enter the hole 106 with the conductive liquid and are discharged through the drain port 107, the voltage sampling circuit 105 can collect the voltage pulse signal. Finally, the processor can determine the number of target particles in the conductive liquid according to the number of pulses of the voltage pulse signal, and / or, according to the voltage size of the voltage pulse signal, determine the particle size of the corresponding target particles.

[0083] 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.

[0084] 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 6 This is a schematic diagram of a slurry coating system provided in some embodiments of the present application. Figure 6 As shown, it includes a coating device 610, a slurry processing device 620, a particle conveying device 630 and an insulating groove 101 in the slurry detection device.

[0085] The coating device 610 includes: a first storage tank 6101 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 610 also includes a coating valve 6102, a coating pumping device 6103, a coating pipeline pressure gauge 6104, and a coating feeler 6105, etc., for completing the coating operation.

[0086] The slurry processing device 620 is used to take out a preset amount of battery slurry sample from the first storage tank 6101 through the first interface, and clean and filter the battery slurry sample to obtain the cleaned and filtered target particles. The particle conveying device 630 is used to convey the target particles in the slurry processing device 620 to the insulating slot 101 of the slurry detection device.

[0087] The first storage tank 6101 in the coating device 610 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.

[0088] 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.

[0089] 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 6101 by extraction; or a height difference can be set to set the first storage tank 6101 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.

[0090] 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 insulating tank by means of wind blowing or solution flushing.

[0091] 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.

[0092] 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 6 As shown, the sampling device includes a first pipeline assembly, a second storage tank 6201, a filtering device 6202, a second pumping device 6203 and a waste liquid container 6204.

[0093] The first pipeline assembly includes a first pipeline and a second pipeline. The second storage tank 6201 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 6202 is connected to the other end of the first pipeline, and the first liquid outlet of the filter device 6202 is connected to one end of the second pipeline; the filter device 6202 is used to filter the battery slurry to obtain the target particles in the battery slurry. The second pumping device 6203 is located in the second pipeline and provides power to make the waste liquid flowing out of the filter device 6202 flow to the waste liquid container 6204 via the second pipeline.

[0094] The specific structures of the above components are not limited. The second interface of the second storage tank 6201 is connected to the first interface of the first storage tank 6101 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 6201 and the first storage tank 6101, so that the battery slurry in the first storage tank 6101 flows to the second storage tank 6201 under the influence of gravity, and can be controlled by a valve.

[0095] The second storage tank 6201 is used to store a preset amount of battery slurry sample. For accurate sampling, a scale can be set on the second storage tank 6201, 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.

[0096] The third interface of the second storage tank 6201 is connected to the filtering device 6202 through the first pipeline, and the battery slurry sample is sent into the filtering device 6202 for filtration to obtain target particles.

[0097] The filter device 6202 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 6204, and the cleaning waste liquid generated in the filter device 6202 is sent to the waste liquid container 6204 through the second pumping device 6203.

[0098] 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 6204 to achieve waste liquid recovery.

[0099] A cleaning device for cleaning a battery slurry sample in a slurry processing device is provided herein. Figure 6As shown, the cleaning device includes a second pipeline assembly, a cleaning liquid container 6205 and a third pumping device 6206.

[0100] The second pipeline assembly includes a third pipeline, one end of which is connected to the second liquid inlet of the filter device 6202; the other end of the third pipeline is connected to the cleaning liquid container 6205. The third pumping device 6206 is located in the third pipeline and provides power to make the solution in the cleaning liquid container 6205 flow into the filter device 6202 via the third pipeline.

[0101] In this embodiment, the third pumping device 6206 in the cleaning device can extract the required cleaning liquid, thereby realizing the cleaning operation of the battery slurry sample in the filtering device 6202. The structure is simple, the implementation is convenient, and the cleaning effect is good.

[0102] In practical applications, multiple valves can be set to improve the controllability of the entire system. Figure 6 As shown, a first valve 6207 is provided in the pipeline between the first storage tank 6101 and the second storage tank 6201, and / or a second valve 6208 is provided on the second pipeline.

[0103] As mentioned above, the height difference can be set for the first valve 6207, and the first storage tank 6101 can be set at a higher position, and the battery slurry sample can be directly taken out by gravity. In order to control the sample amount of the battery slurry sample taken, the first valve 6207 is set on the sampling pipeline in the embodiment of the present application, and the first valve 6207 is opened when sampling is required, and the first valve 6207 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 6207.

[0104] As for the second valve 6208, 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 6202, the second valve 6208 can be closed first, and after the cleaning liquid contacts the battery slurry sample for a period of time, the second valve 6208 can be opened to discharge the waste liquid.

[0105] Similarly, if Figure 6 As shown, in order to improve controllability, a third valve 6209 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 6205 to the filter device 6202 through the third pipeline. The third valve 6209 is added to the third pipeline to accurately control the amount of the cleaning liquid.

[0106] In addition, a first pressure gauge 6210 may be provided on the third pipeline, and a second pressure gauge 6211 may be provided on the second pipeline, so as to obtain the liquid pressure data in the pipeline and realize more precise control.

[0107] 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 6207 and the second valve 6208 respectively, thereby realizing precise control of the sampling device; and controls the conduction of the third pipeline through the third valve 6209, thereby realizing precise control of the cleaning device; thereby improving the controllability of the entire system.

[0108] This embodiment also provides a specific structure of a particle conveying device, such as Figure 6 As shown, the particle conveying device 630 includes a liquid storage tank 6301 and a first pumping device 6303. The first pumping device 6303 is used to extract the solution in the liquid storage tank 6301 to flush the target particles after cleaning and filtration in the slurry processing device 620 into the insulation tank 101 through the solution.

[0109] In addition, as an optional example, a third pressure gauge 6304 and a fourth valve 6302 can be set on the pipeline between the liquid storage tank 6301 and the particle conveying device 630. The third pressure gauge 6304 can obtain the liquid pressure data in the pipeline, and the fourth valve 6302 can control the conduction of the pipeline, thereby achieving more precise control.

[0110] For the rigor of the test, the solution in the liquid storage tank 6301 is usually the conductive liquid mentioned above. Initially, the insulating tank may not contain the conductive liquid, or may contain a small amount of conductive liquid. After the conductive liquid in the liquid storage tank 6301 is flushed into the insulating tank, its conductivity will not be affected.

[0111] 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 insulating tank as much as possible. The flushing time of the first pumping device 6303 can be pre-set based on the sampling volume of the battery slurry to ensure the flushing effect; the first pumping device 6303 can also be stopped after the target particles are completely flushed through manual observation.

[0112] Through the first pumping device 6303 provided in the embodiment of the present application, the solution in the liquid storage tank 6301 can be extracted, and the target particles can be flushed from the slurry processing device into the insulating tank, thereby efficiently completing the transfer of the target particles.

[0113] The slurry coating system provided in the embodiment of the present application can not only complete the normal coating process through the coating device 610, 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 insulating tank through the particle conveying device; finally, the target particles are detected through the slurry detection device.

[0114] like Figure 6 As shown, in actual application, a fifth valve 640 may be provided between the particle conveying device and the insulating tank to control the conduction of the pipeline between the two. In addition, a pipeline may also be provided between the waste liquid container 6204 and the second storage tank 6201, and the excess waste liquid in the second storage tank 6201 may be discharged to the waste liquid container 6204, and a sixth valve 6212 may be provided on the pipeline between the waste liquid container 6204 and the second storage tank 6201 to control the conduction of the pipeline.

[0115] 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.

[0116] by Figure 6 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 into the insulating groove 101 is provided here.

[0117] First, open the first valve 6207, and the battery slurry in the first storage tank 6101 enters the second storage tank 6201 through the pipeline where the first valve 6207 is located, and close the first valve 6207 after taking enough battery slurry samples. The battery slurry sample enters the filter device 6202 through the first pipeline. At this time, open the third valve 6209, and the third pumping device 6206 extracts the cleaning liquid in the cleaning liquid container 6205 to the filter device 6202 to complete the cleaning and filtration of the battery slurry sample in the filter device 6202. After the cleaning is completed, it is necessary to close the third valve 6209, open the second valve 6208, and discharge the cleaned waste liquid into the waste liquid container 6204 through the second pumping device 6203. This cleaning process may be repeated multiple times, and the second valve 6208 and the third valve 6209 may also be opened at the same time for cleaning. At this point, the target particles in the filter device 6202 are obtained. Keep the second valve 6208 and the third valve 6209 closed.

[0118] Then, a flushing process is performed, the fourth valve 6302 and the fifth valve 640 are opened, the first pumping device 6303 extracts the liquid in the liquid storage tank 6301 , and flushes the target particles of the filtering device 6202 into the insulating tank 101 .

[0119] 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 7 The following is a schematic flow chart of a slurry detection method provided in some embodiments of the present application. Figure 7 As shown, the method comprises the following steps: S701: After the first electrode and the second electrode of the DC power supply are powered on, a voltage pulse signal generated between the first electrode and the second electrode when the target particles pass through the orifice tube is collected through a voltage sampling circuit.

[0120] S702: Based on the voltage pulse signal, determine the particle status in the battery slurry to be detected.

[0121] 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.

[0122] In order to determine the particle situation in the battery slurry to be detected, it is necessary to detect the particle size and / or particle quantity of the target particles in the conductive liquid, and then deduce the particle situation in the battery slurry. Therefore, the embodiment of the present application provides a specific implementation method, which determines the particle situation in the battery slurry to be detected based on the voltage pulse signal, including the following steps: Get the pulse number and voltage size of the voltage pulse signal.

[0123] The number of target particles in the conductive liquid is determined according to the number of pulses of the voltage pulse signal.

[0124] The particle size of the target particles in the conductive liquid is determined according to the voltage of the voltage pulse signal.

[0125] According to the particle size and / or particle quantity of the target particles in the conductive liquid, it is determined whether the particle condition in the battery slurry to be tested is abnormal.

[0126] For example, if the particle size of the target particle exceeds the particle size threshold, and / or the particle number of the target particle exceeds the number threshold, it can be determined that the particle situation in the battery slurry is abnormal. As an optional implementation, the number of particles of the target particle whose particle size exceeds the particle size threshold can also be counted, and when it is detected that the particle number exceeds the number threshold, it is determined that the particle situation is abnormal.

[0127] The embodiment of the present application can determine the number and particle size of the target particles by analyzing the number of pulses and the voltage magnitude of the voltage pulse signal, thereby accurately understanding whether the particle situation in the battery slurry is abnormal.

[0128] Furthermore, when determining the particle size of the target particles in the conductive liquid based on the voltage of the voltage pulse signal, it is necessary to determine the corresponding relationship between the voltage of the voltage pulse signal and the particle size of the target particles, as shown in formula (1). That is, the resistivity of the conductive liquid, the size of the preset aperture, and the current generated by the DC power supply are obtained, and then after obtaining the voltage of the voltage pulse signal, the particle size of the target particles in the conductive liquid can be determined.

[0129] The embodiment of the present application establishes a corresponding relationship between the voltage magnitude of the voltage pulse signal and the particle size of the target particle matter based on various parameters, so that after obtaining the voltage magnitude of the voltage pulse signal, the particle size of the target particle matter can be quickly determined.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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: Insulation slots and detection components; The insulating groove is used to contain the conductive liquid and the target particles dispersed in the conductive liquid; The target particles are obtained by filtering a preset amount of battery slurry sample, and the conductivity of the conductive liquid is different from the conductivity of the target particles; The particle size of the target particles is in the micron level; The detection component comprises: A hole having a preset aperture at one end of the hole tube and immersed in the conductive liquid in the insulating groove, wherein the conductive liquid is discharged from the insulating groove through the other end of the hole tube; the preset aperture is set based on the size of the target particle; A direct current power supply, wherein a first electrode and a second electrode of the direct current power supply are both immersed in the conductive liquid, and one of the first electrode and the second electrode is located inside the orifice tube, and the other is located outside the orifice tube; A voltage sampling circuit, the voltage sampling circuit is connected in parallel with the DC power supply; it is used to detect a voltage pulse signal generated between the first electrode and the second electrode when the target particles pass through the orifice tube after the first electrode and the second electrode are energized; so as to determine the particle status in the battery slurry based on the voltage pulse signal.

2. The slurry detection device according to claim 1, characterized in that: The detection component also includes: a processor; The processor is connected to the voltage sampling circuit, and is used to determine the number of particles of the target particles in the conductive liquid according to the number of pulses of the voltage pulse signal, and / or to determine the corresponding particle size of the target particles according to the voltage magnitude of the voltage pulse signal; The processor is also used to determine whether the particle condition in the battery slurry is abnormal according to the number of particles and / or the particle size in the conductive liquid.

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 the particles in the battery slurry are abnormal, output alarm information to the lower computer.

4. The slurry detection device according to any one of claims 1 to 3, characterized in that: The detection component also includes: a voltage dividing module connected in series with the DC power supply.

5. The slurry detection device according to any one of claims 1 to 3, characterized in that: The slurry detection device further includes: a stirring device for stirring the conductive liquid in the insulating tank.

6. The slurry detection device according to any one of claims 1 to 3, characterized in that: The slurry detection device further includes: a shielding cover arranged around the insulating groove and the detection component.

7. 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 6; 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 insulating groove of the slurry detection device.

8. The slurry coating system according to claim 7, 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 insulating tank through the solution.

9. The slurry coating system according to claim 7 or 8, 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.

10. The slurry coating system according to claim 9, 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.

11. The slurry coating system according to claim 9, 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.

12. The slurry coating system according to claim 11, characterized in that: The second pipeline assembly further includes: a third valve arranged on the third pipeline.

13. A slurry detection method, characterized in that: The slurry detection device applied to any one of claims 1 to 6; the method comprises: After the first electrode and the second electrode of the DC power supply are powered on, a voltage pulse signal generated between the first electrode and the second electrode when the target particle passes through the orifice tube is collected by a voltage sampling circuit; Based on the voltage pulse signal, the particle condition in the battery slurry to be detected is determined.

14. The slurry detection method according to claim 13, characterized in that: The step of determining the particle condition in the battery slurry to be detected based on the voltage pulse signal comprises: Obtaining the pulse number and voltage magnitude of the voltage pulse signal; Determining the number of particles of the target particulate matter in the conductive liquid according to the number of pulses of the voltage pulse signal; Determining the particle size of the target particles in the conductive liquid according to the voltage magnitude of the voltage pulse signal; Whether the particle condition in the battery slurry to be detected is abnormal is determined based on the particle size and / or the particle quantity of the target particle in the conductive liquid.

15. The slurry detection method according to claim 14, characterized in that: Determining the particle size of the target particles in the conductive liquid according to the voltage magnitude of the voltage pulse signal includes: The particle size of the target particles in the conductive liquid is determined according to the voltage of the voltage pulse signal, the resistivity of the conductive liquid, the size of the preset aperture, and the current generated by the DC power supply.

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