Lithium battery positive electrode slurry homogenization production monitoring method based on slurry homogenization device and lithium battery slurry pipeline homogenization system

Abstract

The present disclosure provides a lithium battery positive electrode slurry homogenization production monitoring method based on a slurry homogenization device and a lithium battery slurry pipeline homogenization system. The method includes stirring and homogenizing the positive electrode powder to obtain a primary homogenized slurry; filtering the primary homogenized slurry once to obtain a secondary homogenized slurry; defoaming the secondary homogenized slurry to obtain a secondary buffer slurry; and filtering the secondary buffer slurry twice to obtain a lithium battery positive electrode homogenized slurry. After the positive electrode powder is fed into the mixer, the positive electrode powder is fully stirred to make the primary homogenized slurry more uniform, and then the primary filtering and secondary filtering treatments are respectively performed to reduce foreign matter in the slurry, and defoaming is added between the two filterings to effectively reduce the residual bubbles in the slurry, thereby improving the fluidity of the slurry, so that the slurry homogenization operation is completed at one time, and the positive electrode slurry production efficiency is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lithium batteries, and in particular to a lithium battery positive electrode slurry homogenization production monitoring method based on a slurry homogenization device and a lithium battery slurry pipeline homogenization system. Background Art

[0002] In the production of lithium batteries, the production and processing of lithium battery slurry is particularly important. Both positive and negative electrode slurries need to be homogenized, which is the process of fully mixing, dispersing and stirring the various materials and solvents used in the preparation of lithium batteries. At present, an excellent lithium battery homogenization system can evenly disperse the components of the positive and negative electrode slurries of lithium batteries to obtain consistent and high-quality electrode materials.

[0003] In the existing homogenization system, batch, continuous, sealed and other methods are used for slurry stirring and transmission, and generally work according to a pre-set program. Since the slurry is relatively complex and contains multiple materials such as active materials, conductive agents, adhesives, etc., bubbles, sedimentation, and unclean filtration will appear in the homogenization system. Although a normal homogenization system can complete the uniform mixing of the slurry, it cannot ensure that the slurry after homogenization can meet the use requirements. Repeated homogenization and transmission affect the slurry production efficiency, thereby leading to production costs. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a lithium battery positive electrode slurry production monitoring method based on a slurry homogenization device and a lithium battery slurry pipeline homogenization system that effectively improves the production efficiency of positive electrode slurry homogenization.

[0005] The purpose of this disclosure is achieved through the following technical solutions:

[0006] A method for monitoring the production of lithium battery positive electrode slurry homogenization based on a slurry homogenization device, comprising: using a slurry homogenization device to homogenize, stir and transport positive electrode powder, wherein the slurry homogenization device comprises:

[0007] A mixer, wherein the feed port of the mixer is used to pour the positive electrode powder into the mixer to stir the positive electrode powder to form a primary homogenized slurry;

[0008] A first conveying member, wherein an input end of the first conveying member is connected to a material outlet of the mixer, and the first conveying member is used to convey a primary homogenized slurry;

[0009] A first filter element, wherein the input end of the first filter element is connected to the output end of the first conveying element, and the first filter element is used for filtering the primary homogenized slurry to form a secondary homogenized slurry;

[0010] A transfer tank, the input end of which is in communication with the output end of the first filter element, and the transfer tank is used to temporarily store the secondary homogenized slurry to form a secondary cache slurry;

[0011] A second conveying member, wherein an input end of the second conveying member is connected to an output end of the transfer tank, and the second conveying member is used to convey the secondary cache slurry;

[0012] A second filter element, wherein the input end of the second filter element is connected to the output end of the second conveying element, and the second filter element is used to filter the secondary cache slurry to form a lithium battery positive electrode homogenized slurry;

[0013] The lithium battery positive electrode slurry homogenization production monitoring method comprises:

[0014] The positive electrode powder is stirred and homogenized to obtain a primary homogenized slurry;

[0015] Performing a filtering treatment on the primary homogenate slurry to obtain a secondary homogenate slurry;

[0016] Defoaming the secondary homogenized slurry to obtain a secondary cache slurry;

[0017] Performing secondary filtration treatment on the secondary cache slurry to obtain a lithium battery positive electrode homogenized slurry;

[0018] The first filtering treatment of the primary homogenized slurry and the second filtering treatment of the secondary cache slurry both specifically include the following steps:

[0019] Obtain the point measurement parameters of the conveying pipeline of each conveying part;

[0020] Detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter;

[0021] When the transport pipeline point measurement parameter is greater than the first preset blockage point measurement parameter, a post-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline after the current test point.

[0022] In one embodiment, the detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter further includes: when the point measurement parameter of the delivery pipeline is less than or equal to the first preset blockage point measurement parameter, detecting whether the point measurement parameter of the delivery pipeline is less than a second preset blockage point measurement parameter; when the point measurement parameter of the delivery pipeline is less than the second preset blockage point measurement parameter, sending a pre-point cleaning signal to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline before the current test point.

[0023] In one embodiment, the detecting whether the point measurement parameter of the conveying pipeline is less than a second preset blockage point measurement parameter also includes: when the point measurement parameter of the conveying pipeline is greater than or equal to the second preset blockage point measurement parameter, obtaining the conveying pipeline remeasurement parameter of the conveying part; performing safety re-inspection processing on the conveying pipeline remeasurement parameter to obtain the number of conveying remeasurement safety items; detecting whether the number of conveying remeasurement safety items is less than or equal to the preset number of items; when the number of conveying remeasurement safety items is less than or equal to the preset number of items, sending a global cleaning signal to the pipeline homogenization cleaning system to perform full-section cleaning on each pipeline.

[0024] In one embodiment, the stirring and homogenizing the positive electrode powder includes: stirring the positive electrode powder at a uniform speed at a preset rotation speed.

[0025] In one embodiment, the filtering treatment of the first-stage homogenized slurry includes: filtering the first-stage homogenized slurry once.

[0026] In one of the embodiments, the filtering treatment of the primary homogenized slurry further includes: performing an iron removal operation on the primary homogenized slurry.

[0027] In one of the embodiments, the defoaming treatment of the secondary homogenized slurry includes: vacuuming the secondary homogenized slurry in the transfer tank to eliminate bubbles in the secondary homogenized slurry.

[0028] In one embodiment, the first conveying member includes a diaphragm pump and a first conveying pipe, the input end of the diaphragm pump is connected to the discharge port of the mixer, and the output end of the diaphragm pump is connected to the input end of the first filter element through the first conveying pipe.

[0029] In one embodiment, the first filter element includes a primary filter and a second delivery pipe, the input end of the primary filter is connected to the first delivery pipe, and the output end of the primary filter is connected to the input end of the transfer tank through the second delivery pipe.

[0030] A lithium battery slurry pipeline homogenization system adopts the lithium battery positive electrode slurry homogenization production monitoring method based on the slurry homogenization device described in any of the above embodiments.

[0031] Compared with the prior art, the present invention has at least the following advantages:

[0032] After the positive electrode powder is fed into the mixer, it is fully stirred to make the primary homogenized slurry more uniform to increase the slurry viscosity. Then, the slurry is filtered through a primary filtration treatment and a secondary filtration treatment to reduce foreign matter in the slurry. Defoaming is added between the two filtrations to effectively reduce the residual bubbles in the slurry, thereby improving the fluidity of the slurry and completing the slurry homogenization operation at one time, effectively improving the production efficiency of the positive electrode slurry homogenization. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a flow chart of a method for monitoring production of lithium battery positive electrode slurry based on a slurry homogenization device in one embodiment;

[0035] Figures 2 to 4 It is a schematic diagram of the components distributed sequentially in a slurry homogenization device in one embodiment. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] The present disclosure relates to a method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device. In one embodiment, the method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device includes stirring and homogenizing the positive electrode powder to obtain a primary homogenized slurry; filtering the primary homogenized slurry once to obtain a secondary homogenized slurry; defoaming the secondary homogenized slurry to obtain a secondary buffer slurry; and filtering the secondary buffer slurry twice to obtain a lithium battery positive electrode homogenized slurry. After the positive electrode powder is fed into the mixer, the positive electrode powder is fully stirred to make the primary homogenized slurry more uniform to increase the viscosity of the slurry, and then the primary filtering and secondary filtering treatments are respectively performed to filter the slurry, thereby reducing foreign matter in the slurry, and adding defoaming between the two filterings to effectively reduce the residual bubbles in the slurry, thereby improving the fluidity of the slurry, so that the slurry homogenization operation is completed at one time, and the positive electrode slurry production efficiency is effectively improved.

[0040] See also Figure 1 , which is a flow chart of a method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device according to an embodiment of the present disclosure. Figures 2 to 4 The slurry homogenization device includes: a mixer, a first conveying member, a first filter member, a transfer tank, a second conveying member and a second filter member; the feed port of the mixer is used to pour positive electrode powder to stir and form a primary homogenized slurry; the input end of the first conveying member is connected to the discharge port of the mixer, and the first conveying member is used to convey the primary homogenized slurry; the input end of the first filter member is connected to the output end of the first conveying member, and the first filter member is used to filter the primary homogenized slurry to form a secondary homogenized slurry; the input end of the transfer tank is connected to the output end of the first filter member, and the transfer tank is used to temporarily store the secondary homogenized slurry to form a secondary cache slurry; the input end of the second conveying member is connected to the output end of the transfer tank, and the second conveying member is used to convey the secondary cache slurry; the input end of the second filter member is connected to the output end of the second conveying member, and the second filter member is used to filter the secondary cache slurry to form a lithium battery positive electrode homogenized slurry. The lithium battery positive electrode slurry homogenization production monitoring method based on the slurry homogenization device includes part or all of the following steps.

[0041] S100: stirring and homogenizing the positive electrode powder to obtain a primary homogenized slurry.

[0042] In this embodiment, the positive electrode powder is used as the raw material of the positive electrode slurry of the lithium battery. The positive electrode powder is fed into the mixer for mixing and stirring. Under the high-speed and uniform stirring of the mixer, the positive electrode powder is fully mixed and stirred with various materials such as the conductive agent and the binder in the mixer to obtain the precursor of the positive electrode slurry, that is, the primary homogenized slurry. In order to meet the viscosity and uniformity requirements of the slurry, the stirring rate is 500 rpm to 2000 rpm to break up the particle aggregates and obtain a uniform primary homogenized slurry.

[0043] S200: performing a filtering treatment on the primary homogenized slurry to obtain a secondary homogenized slurry.

[0044] In this embodiment, the primary homogenized slurry is a mixed slurry formed after being fully stirred by the stirrer. At this time, there is doping in the primary homogenized slurry. By filtering the primary homogenized slurry once, it is convenient to remove the impurities in the primary homogenized slurry to improve the purity of the positive electrode slurry.

[0045] 1. Primary filtration particle size range: Select a filter with a filtration accuracy of 10μm to 50μm. The specific range depends on the process requirements. The main purpose of this process is to remove larger particles, impurities or agglomerates to ensure a more uniform distribution of slurry particles to avoid defects in the subsequent coating process.

[0046] 2. Primary iron removal particle size range: Iron removal equipment can remove iron impurities with a particle size of 1μm or above. High-precision iron removers can even reach submicron level, but the appropriate precision needs to be selected according to the production requirements of the slurry.

[0047] S300: Defoaming the secondary homogenized slurry to obtain a secondary cache slurry.

[0048] In this embodiment, bubbles are easily generated inside the secondary homogenized slurry after it has been filtered out once, that is, the internal gap of the secondary homogenized slurry is too large and gas remains, and these bubbles easily lead to a decrease in the conductivity of the positive electrode slurry. At this time, by defoaming the secondary homogenized slurry, it is easy to remove the residual bubbles inside the secondary homogenized slurry, thereby effectively improving the quality of the positive electrode slurry.

[0049] S400: performing secondary filtering treatment on the secondary cache slurry to obtain a lithium battery positive electrode homogenized slurry.

[0050] In this embodiment, the secondary cache slurry is the slurry that has been defoamed in the transfer tank. At this time, in order to further improve the purity of the positive electrode slurry, it is subjected to secondary filtration treatment, so that the impurities in the lithium battery positive electrode homogenized slurry are further reduced, ensuring that the quality of the lithium battery positive electrode homogenized slurry meets the requirements. Secondary filtration particle size range: Usually a filtration accuracy of 1μm to 10μm is selected to remove remaining fine particles and agglomerates. This step is intended to ensure that there are only uniform fine particles in the slurry, so that the slurry is more uniform during the coating process. Secondary iron removal particle size range: A higher precision magnetic filter is used to remove iron impurities with a particle size of <1μm. Modern magnetic filters can be accurate to the submicron level, thereby ensuring that the iron impurity content in the slurry reaches an extremely low level.

[0051] In this embodiment, after the positive electrode powder is fed into the mixer, the positive electrode powder is fully stirred to make the primary homogenized slurry more uniform to increase the viscosity of the slurry. Then, a primary filtration treatment and a secondary filtration treatment are performed to filter the slurry, thereby reducing foreign matter in the slurry. Defoaming is added between the two filtrations to effectively reduce the residual bubbles in the slurry, thereby improving the fluidity of the slurry and completing the slurry homogenization operation at one time, effectively improving the positive electrode slurry homogenization production efficiency.

[0052] In one of the embodiments, the stirring and homogenizing of the positive electrode powder includes: stirring the positive electrode powder at a uniform speed at a preset rotation speed. In this embodiment, the positive electrode powder is used as the initial material of the positive electrode slurry of the lithium battery. The positive electrode powder is mixed and stirred with a variety of materials such as a conductive agent and a binder in the mixer. The uniform stirring operation in the mixer facilitates the uniform mixing of the various materials in the mixer so that the viscosity of the primary homogenized slurry meets the requirements. The positive electrode powder is stirred at a preset rotation speed by the stirring paddle in the mixer, and the stirring efficiency can be improved by adjusting the rotation speed.

[0053] In another embodiment, the first conveying member includes a diaphragm pump and a first conveying pipe, the input end of the diaphragm pump is connected to the discharge port of the mixer, and the output end of the diaphragm pump is connected to the input end of the first filter element through the first conveying pipe. The first conveying pipe serves as a pipeline between the mixer and the first filter element, and the first conveying pipe conveys the primary homogenized slurry. The diaphragm pump serves as a conveying power source for the primary homogenized slurry in the first conveying pipe. Driven by the diaphragm pump, the primary homogenized slurry can be quickly conveyed from the mixer to the first filter element.

[0054] In one embodiment, the filtering treatment of the primary homogenized slurry includes: filtering the primary homogenized slurry. In this embodiment, the primary homogenized slurry is formed after being stirred at a uniform speed by a stirrer, that is, the primary homogenized slurry is a mixed slurry of various materials, and the primary homogenized slurry is easy to gather foreign matter in the slurry after stirring. At this time, by filtering the primary homogenized slurry once, it is easy to filter out foreign matter in the primary homogenized slurry, so that the foreign matter content in the secondary homogenized slurry is reduced, and the purity of the secondary homogenized slurry is effectively improved.

[0055] In another embodiment, the first filter element includes a primary filter and a second delivery pipe, the input end of the primary filter is connected to the first delivery pipe, and the output end of the primary filter is connected to the input end of the transfer tank through the second delivery pipe. The second delivery pipe serves as a pipeline between the diaphragm pump and the transfer tank, and the second delivery pipe delivers the primary homogenized slurry, and the primary filter serves as a filter for the primary homogenized slurry. Under the filtration of the primary filter, foreign matter in the primary homogenized slurry can be easily removed.

[0056] Furthermore, the filtering treatment of the primary homogenized slurry also includes: performing an iron removal operation on the primary homogenized slurry. In this embodiment, the primary homogenized slurry is formed after being stirred at a uniform speed by a mixer, that is, the primary homogenized slurry is a mixed slurry of various materials, and the primary homogenized slurry is easy to gather iron powder and other metal powders in the slurry after stirring. By performing an iron removal operation on the primary homogenized slurry, it is easy to remove the iron powder and other easily magnetized metals in the primary homogenized slurry. For example, by adding a magnet trolley at the discharge port of the mixer, the iron powder and other easily magnetized metals in the primary homogenized slurry can be adsorbed to improve the purity of the positive electrode slurry.

[0057] In another embodiment, the first filter element further includes a primary magnetic iron remover, which is connected to the second conveying pipe and is used to remove iron powder and other easily magnetized metals in the primary homogenized slurry.

[0058] In one embodiment, the defoaming treatment of the secondary homogenized slurry includes: vacuuming the secondary homogenized slurry in the transfer tank to eliminate the bubbles in the secondary homogenized slurry. In this embodiment, the secondary homogenized slurry is formed after the primary homogenized slurry is filtered out once, and the foreign matter in the secondary homogenized slurry has been basically removed. The secondary homogenized slurry is also mixed and stirred in a mixer. At this time, the secondary homogenized slurry will have gaps inside due to stirring and filtering, resulting in bubbles in the secondary homogenized slurry. The presence of bubbles inside the slurry will reduce the conductivity of the slurry. In order to eliminate the influence of bubbles, the secondary homogenized slurry is placed in the transfer tank. By vacuuming the transfer tank, the internal space of the transfer tank is placed in a vacuum environment, which is convenient for sucking out the excess residual gas inside the secondary homogenized slurry, thereby eliminating the bubbles in the secondary homogenized slurry and ensuring that the gaps between the slurry particles inside the secondary homogenized slurry meet the requirements.

[0059] In one embodiment, the secondary cache slurry is subjected to secondary filtration treatment, including: performing secondary filtration operation on the secondary cache slurry. In this embodiment, the secondary cache slurry is temporarily stored in the transfer tank. After the secondary cache slurry is vacuumed, the bubbles inside it are eliminated, and the bubbles and foreign impurities inside the secondary cache slurry are basically removed. Before the secondary cache slurry is finally formed into a lithium battery positive electrode slurry that meets the requirements, it is necessary to perform secondary filtration on it, so as to filter out the foreign impurities in the secondary cache slurry more carefully, so that the number of foreign impurity particles in the secondary cache slurry is further reduced. Specifically, the particle diameter of the foreign impurities screened out by the secondary filtration operation is smaller than the particle diameter of the foreign impurities screened out by the primary filtration operation. Among them, the vacuum pressure range is usually between -0.06MPa and -0.09MPa (i.e., a vacuum degree of 60-90kPa). This range can remove larger bubbles and air in part of the solvent without causing excessive impact on the fluidity and viscosity of the slurry.

[0060] Furthermore, the secondary filtration treatment of the secondary cache slurry also includes: performing a secondary iron removal operation on the secondary cache slurry. In the present embodiment, the secondary cache slurry is temporarily stored in the transfer tank, and the bubbles inside the secondary cache slurry are eliminated after the vacuum treatment, and at this time, the bubbles and foreign impurities inside the secondary cache slurry are basically removed. Before the secondary cache slurry is finally formed into a lithium battery positive electrode slurry that meets the requirements, it is necessary to perform a secondary iron removal on it, so as to more carefully filter out the residual iron powder and other easily magnetized metals in the secondary cache slurry, so that the amount of iron powder and other easily magnetized metals in the secondary cache slurry is further reduced. Specifically, the magnetic attraction generated by the secondary iron removal operation is greater than the magnetic attraction generated by the primary iron removal operation.

[0061] In another embodiment, the second conveying member includes a screw pump and a third conveying pipe, the second filtering member includes a secondary filter, a secondary magnetic iron remover and a fourth conveying pipe, the input end of the screw pump is connected to the output end of the transfer tank, the output end of the screw pump and the input end of the secondary filter are both connected to the third conveying pipe, the output end of the secondary filter is connected to the fourth conveying pipe, and the secondary magnetic iron remover is arranged at the connection between the secondary filter and the fourth conveying pipe. In this embodiment, the screw pump serves as a power source for the transmission of the secondary cache slurry in the third conveying pipe and the fourth conveying pipe, the secondary filter and the secondary magnetic iron remover filter the secondary cache slurry for foreign matter and remove iron to improve the quality of the lithium battery positive electrode homogenized slurry.

[0062] In the actual production process of the positive electrode slurry of the lithium battery, pipeline cleaning is usually carried out after a batch of slurry processing is completed. This traditional batch processing method is mainly used to prevent mixing or contamination between different batches of slurry, and usually uses a pipeline robot to remove the residue in the pipeline. However, this approach has certain limitations. Cleaning is only carried out after the batch processing is completed, resulting in the positive electrode slurry staying in the pipeline for a long time, increasing the risk of blockage or reducing the quality of the slurry. In addition, since more slurry residues may accumulate in the pipeline, the cleaning work becomes more difficult and time-consuming. This not only increases the difficulty of cleaning, but also may extend the production downtime, thereby affecting the overall production efficiency. Among them, the pipeline from the mixer discharge port to the diaphragm pump feed port, the pipeline from the diaphragm pump discharge port to the transfer tank feed port, the pipeline from the transfer tank discharge port to the screw pump feed port, and the pipeline from the screw pump discharge port to the finished product tank feed port often cause pipe blockage problems due to untimely cleaning, which will seriously cause pipeline rupture.

[0063] In order to improve the timeliness of cleaning in the pipeline, the first-stage homogenized slurry is filtered once and the second-stage cache slurry is filtered twice, both of which specifically include the following steps:

[0064] Obtain the point measurement parameters of the conveying pipeline of each conveying part;

[0065] Detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter;

[0066] When the transport pipeline point measurement parameter is greater than the first preset blockage point measurement parameter, a post-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline after the current test point.

[0067] In this embodiment, the point measurement parameters of the conveying pipeline are the slurry conveying state parameters in the pipeline of the first conveying member and the second conveying member. By collecting the point measurement parameters of the conveying pipeline, it is convenient to determine the slurry conveying conditions in each conveying pipeline. The point measurement parameters of the conveying pipeline are obtained by single-point testing of each conveying pipeline, that is, the slurry conveying state in the pipeline is tested at the designated test point of the conveying pipeline. The first preset blocking point measurement parameter is the standard conveying state of the slurry in the current conveying pipeline, that is, the slurry conveying state corresponding to the first preset blocking point measurement parameter is a smooth flow state. The point measurement parameter of the conveying pipeline is greater than the first preset blocking point measurement parameter, indicating that the slurry conveying in the current conveying pipeline is in an abnormal state, that is, it indicates that the position where the slurry in the current conveying pipeline is blocked is located after the test point, that is, it indicates that the current test point is located before the position where the slurry in the pipeline is blocked. At this time, a post-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline after the current test point, so as to facilitate pipeline unblocking from the current test point backwards, thereby facilitating accurate and rapid cleaning of the blocked point.

[0068] Furthermore, the step of detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter further includes:

[0069] When the transport pipeline point measurement parameter is less than or equal to the first preset blockage point measurement parameter, detecting whether the transport pipeline point measurement parameter is less than a second preset blockage point measurement parameter;

[0070] When the transport pipeline point measurement parameter is less than the second preset blockage point measurement parameter, a pre-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline before the current test point.

[0071] In this embodiment, the point measurement parameter of the delivery pipeline is less than or equal to the first preset blockage point measurement parameter, indicating that the slurry is not blocked after the test point of the current delivery pipeline. The point measurement parameter of the delivery pipeline is less than the second preset blockage point measurement parameter, indicating that the slurry delivery in the current delivery pipeline is also in an abnormal state, that is, it indicates that the position where the slurry in the current delivery pipeline is blocked is located before the test point, that is, it indicates that the current test point is located after the position where the slurry in the pipeline is blocked. At this time, a pre-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline before the current test point, so as to facilitate pipeline unblocking from the current test point forward, thereby facilitating accurate and rapid cleaning of the blockage point.

[0072] In another embodiment, the point measurement parameters of the delivery pipeline include at least one of the pipeline slurry delivery pressure and the pipeline slurry delivery flow rate corresponding to the test point of the delivery pipeline. The pipeline slurry delivery pressure is 0.4MPa, and the pipeline slurry delivery flow rate is 120kg / min.

[0073] Furthermore, the detecting whether the point measurement parameter of the delivery pipeline is less than a second preset blockage point measurement parameter further includes:

[0074] When the transport pipeline point measurement parameter is greater than or equal to the second preset blockage point measurement parameter, obtaining a transport pipeline re-measurement parameter of the transport component;

[0075] Performing safety re-inspection processing on the re-measured parameters of the transmission pipeline to obtain the number of transmission re-measurement safety items;

[0076] Detecting whether the number of transport retest safety items is less than or equal to a preset number of items;

[0077] When the number of transport retest safety items is less than or equal to the preset number of items, a global cleaning signal is sent to the pipeline homogenization cleaning system to perform full-section cleaning on each pipeline.

[0078] In this embodiment, the transport pipeline point measurement parameter is greater than or equal to the second preset blockage point measurement parameter, indicating that the single transport test parameter of the slurry in the pipeline corresponding to the current test point is normal. At this time, the single test parameter may not be comprehensive for the detection of the slurry transport status in the pipeline. By collecting the retest parameters of the delivery pipeline, the comprehensive delivery state of the slurry in the pipeline corresponding to the current test point is sampled. Specifically, the retest parameters of the delivery pipeline include at least three of the pipeline slurry delivery temperature, pipeline slurry delivery viscosity, pipeline slurry solid content, pipeline slurry delivery flow resistance and pipeline slurry delivery pH. Specifically, the pipeline slurry delivery temperature is ≤60°C; when the slurry is lithium iron phosphate, the pipeline slurry delivery viscosity is 3000 mpa•s to 20000 mpa•s, and the pipeline slurry solid content is 50%-60%; when the slurry is ternary, the pipeline slurry delivery viscosity is 3000 mpa•s to 15000 mpa•s, and the pipeline slurry solid content is 70%-80%; the pipeline slurry delivery flow resistance is 1.3×10 5 Pa; the pH value of pipeline slurry transportation is PH=8~9. The safety re-inspection processing of the re-measured parameters of the transportation pipeline is a safety detection of each parameter in the re-measured parameters of the transportation pipeline, that is, a secondary detection of each parameter in the re-measured parameters of the transportation pipeline that exceeds the corresponding normal situation, so as to facilitate the determination of the number of each parameter in the re-measured parameters of the transportation pipeline in a safe state. The number of transportation re-measurement safety items is less than or equal to the preset number of items, indicating that the number of each parameter in the re-measured parameters of the transportation pipeline in a safe state is lower than the specified number of safe states, that is, the composite safety degree of the slurry formed by the various transportation states of the slurry in the pipeline corresponding to the current test point is too low, that is, the pipeline corresponding to the current test point has abnormal transportation conditions other than pressure and flow, and the blockage positions caused by these abnormal conditions are too many or uncertain. At this time, a global cleaning signal is sent to the pipeline homogenization cleaning system to clean the entire section of each pipeline to avoid the situation where pipeline blockage cleaning is missed.

[0079] In another embodiment, when the number of transport retest safety items is greater than the preset number of items, the subsequent processes corresponding to each filtration treatment are executed, that is, the defoaming treatment after the first filtration treatment is executed, or the process after the second filtration treatment is executed.

[0080] In one of the embodiments, the present disclosure also relates to a lithium battery slurry pipeline homogenization system using the lithium battery positive electrode slurry homogenization production monitoring method based on the slurry homogenization device described in any of the above embodiments. In this embodiment, the lithium battery positive electrode slurry homogenization production monitoring method based on the slurry homogenization device includes stirring and homogenizing the positive electrode powder to obtain a primary homogenized slurry; filtering the primary homogenized slurry once to obtain a secondary homogenized slurry; defoaming the secondary homogenized slurry to obtain a secondary cache slurry; filtering the secondary cache slurry twice to obtain a lithium battery positive electrode homogenized slurry. After the positive electrode powder is fed into the mixer, it is fully stirred to make the primary homogenized slurry more uniform to increase the slurry viscosity. Then, the slurry is filtered through a primary filtration treatment and a secondary filtration treatment to reduce foreign matter in the slurry. Defoaming is added between the two filtrations to effectively reduce the residual bubbles in the slurry, thereby improving the fluidity of the slurry and completing the slurry homogenization operation at one time, effectively improving the production efficiency of the positive electrode slurry homogenization.

[0081] Among them, the above-mentioned slurry homogenization device, lithium battery positive electrode slurry homogenization production monitoring method and lithium battery slurry pipeline homogenization system are applied to the standardized, continuous, automated and intelligent production of lithium battery slurry.

[0082] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device, characterized in that: include: A slurry homogenization device is used to homogenize, stir and transport the positive electrode powder, and the slurry homogenization device includes: A mixer, wherein the feed port of the mixer is used to pour the positive electrode powder into the mixer to stir the positive electrode powder to form a primary homogenized slurry; A first conveying member, wherein an input end of the first conveying member is connected to a material outlet of the mixer, and the first conveying member is used to convey a primary homogenized slurry; A first filter element, wherein the input end of the first filter element is connected to the output end of the first conveying element, and the first filter element is used for filtering the primary homogenized slurry to form a secondary homogenized slurry; A transfer tank, the input end of which is in communication with the output end of the first filter element, and the transfer tank is used to temporarily store the secondary homogenized slurry to form a secondary cache slurry; A second conveying member, wherein an input end of the second conveying member is connected to an output end of the transfer tank, and the second conveying member is used to convey the secondary cache slurry; A second filter element, wherein the input end of the second filter element is connected to the output end of the second conveying element, and the second filter element is used to filter the secondary cache slurry to form a lithium battery positive electrode homogenized slurry; The lithium battery positive electrode slurry homogenization production monitoring method comprises: The positive electrode powder is stirred and homogenized to obtain a primary homogenized slurry; Performing a filtering treatment on the primary homogenate slurry to obtain a secondary homogenate slurry; Defoaming the secondary homogenized slurry to obtain a secondary cache slurry; Performing secondary filtration treatment on the secondary cache slurry to obtain a lithium battery positive electrode homogenized slurry; The first filtering treatment of the primary homogenized slurry and the second filtering treatment of the secondary cache slurry both specifically include the following steps: Acquire the point measurement parameters of the conveying pipeline of each conveying member, wherein the point measurement parameters of the conveying pipeline include at least one of the pipeline slurry conveying pressure and the pipeline slurry conveying flow rate corresponding to the test point of the conveying pipeline; Detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter; When the transport pipeline point measurement parameter is greater than the first preset blockage point measurement parameter, a post-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline after the current test point; The step of detecting whether the point measurement parameter of the delivery pipeline is greater than a first preset blockage point measurement parameter further includes: When the transport pipeline point measurement parameter is less than or equal to the first preset blockage point measurement parameter, detecting whether the transport pipeline point measurement parameter is less than a second preset blockage point measurement parameter; When the transport pipeline point measurement parameter is less than the second preset blockage point measurement parameter, a pre-point cleaning signal is sent to the pipeline homogenization cleaning system to start the pipeline robot to clean the pipeline before the current test point; And, the step of detecting whether the point measurement parameter of the delivery pipeline is less than a second preset blockage point measurement parameter further includes: When the pipeline point measurement parameter is greater than or equal to the second preset blockage point measurement parameter, obtaining the pipeline re-measurement parameters of the conveying member, wherein the pipeline re-measurement parameters include at least three of pipeline slurry conveying temperature, pipeline slurry conveying viscosity, pipeline slurry solid content, pipeline slurry conveying flow resistance, and pipeline slurry conveying pH; Performing safety re-inspection processing on the re-measured parameters of the transmission pipeline to obtain the number of transmission re-measurement safety items; Detecting whether the number of transport retest safety items is less than or equal to a preset number of items; When the number of transport retest safety items is less than or equal to the preset number of items, a global cleaning signal is sent to the pipeline homogenization cleaning system to perform full-section cleaning on each pipeline.

2. The method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device according to claim 1, characterized in that: The stirring and homogenizing treatment of the positive electrode powder comprises: The positive electrode powder is stirred at a uniform speed at a preset speed.

3. The method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device according to claim 1, characterized in that: The first-stage homogenized slurry is subjected to a filtering treatment, comprising: The first-stage homogenized slurry is filtered once.

4. The method for monitoring the production of lithium battery positive electrode slurry based on a slurry homogenization device according to claim 3, characterized in that: The filtering treatment of the primary homogenized slurry once also includes: The primary homogenized slurry is subjected to an iron removal operation.

5. The method for monitoring production of lithium battery positive electrode slurry homogenization based on a slurry homogenization device according to claim 1, characterized in that: The defoaming treatment of the secondary homogenized slurry comprises: The secondary homogenized slurry in the transfer tank is vacuumed to eliminate bubbles in the secondary homogenized slurry.

6. The method for monitoring production of lithium battery positive electrode slurry homogenization based on a slurry homogenization device according to claim 1, characterized in that: The first conveying member includes a diaphragm pump and a first conveying pipe. The input end of the diaphragm pump is connected to the discharge port of the mixer, and the output end of the diaphragm pump is connected to the input end of the first filter element through the first conveying pipe.

7. The method for monitoring production of lithium battery positive electrode slurry homogenization based on a slurry homogenization device according to claim 6, characterized in that: The first filter element includes a primary filter and a second delivery pipe. The input end of the primary filter is connected to the first delivery pipe, and the output end of the primary filter is connected to the input end of the transfer tank through the second delivery pipe.

8. A lithium battery slurry pipeline homogenization system using the lithium battery positive electrode slurry homogenization production monitoring method based on a slurry homogenization device as described in any one of claims 1 to 7.

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