Liquid raw material mixing feeding automation control system

Abstract

The application relates to the technical field of automation control, in particular to a liquid raw material mixing and feeding automation control system. The system comprises the following steps: acquiring raw material initial information and real-time mixing information, analyzing the raw material initial information and the real-time mixing information, determining real-time viscosity information and real-time surface tension information; according to the real-time viscosity information and the real-time surface tension information, determining real-time bubble content; analyzing the real-time bubble content and the real-time mixing information, determining final bubble content; comparing the final bubble content with preset normal bubble content, judging whether the final bubble content is abnormal; if the final bubble content is abnormal, analyzing the real-time mixing information and the preset normal bubble content, determining a real-time adjustment scheme, and controlling a mixing device to execute the real-time adjustment scheme. In the preparation process of lithium hexafluorophosphate liquid salt, the application avoids the residual of a large amount of bubbles in the lithium hexafluorophosphate liquid salt, thereby improving the stability of lithium ion electrolyte.

Description

Technical Field

[0001] This application relates to the field of automation control technology, and in particular to an automated control system for mixing and feeding liquid raw materials. Background Technology

[0002] With the rapid development of the new energy industry, the energy density requirements for lithium-ion batteries are constantly increasing. Lithium-ion battery electrolytes with lithium hexafluorophosphate liquid salt as the main component have advantages such as high electrochemical stability, wide temperature range and high conductivity, and are widely used in commercial lithium-ion batteries.

[0003] In the current batch preparation process of lithium hexafluorophosphate liquid salt, the focus is on monitoring the reaction temperature and feeding rate to ensure safety during the preparation process. However, it is difficult to effectively guarantee the quality of lithium hexafluorophosphate liquid salt during the preparation process. This results in inconsistent quality of lithium-ion battery electrolytes with lithium hexafluorophosphate liquid salt as the main component, which has a negative impact on the performance of lithium-ion batteries. Summary of the Invention

[0004] This application provides an automated control system for mixing and feeding liquid raw materials to solve the above-mentioned technical problems.

[0005] In a first aspect, this application provides an automated control system for mixing and feeding liquid raw materials, the system comprising:

[0006] Acquire initial raw material information and real-time mixing information, analyze the initial raw material information and the real-time mixing information, and determine real-time viscosity information and real-time surface tension information;

[0007] The real-time bubble content is determined based on the real-time viscosity information and the real-time surface tension information;

[0008] Analyze the real-time bubble content and the real-time mixing information to determine the final bubble content;

[0009] The final bubble content is compared with the preset normal bubble content to determine whether the final bubble content is abnormal.

[0010] If the final bubble content is abnormal, analyze the real-time mixing information and the preset normal bubble content, determine the real-time adjustment plan, and control the mixing equipment to execute the real-time adjustment plan.

[0011] This application analyzes initial raw material information and real-time mixing information to determine real-time viscosity and surface tension information. Based on the real-time viscosity and surface tension information, it determines the real-time bubble content. Then, based on the real-time bubble content and real-time mixing information, it analyzes and derives the final bubble content. By comparing the final bubble content with the preset normal bubble content, it determines whether there is any abnormality in the final bubble content. If the final bubble content is abnormal, a real-time adjustment scheme is determined and implemented based on the real-time mixing information and the preset normal bubble content. This avoids a large number of residual bubbles in the lithium hexafluorophosphate liquid salt obtained after mixing lithium hexafluorophosphate with solvents, ensuring the quality of the lithium hexafluorophosphate liquid salt during the preparation process, thereby improving the stability of the lithium-ion electrolyte with lithium hexafluorophosphate liquid salt as the main component.

[0012] Optionally, the initial raw material information includes the initial solvent viscosity, initial solvent surface tension, and initial solvent temperature; the real-time mixing information includes the real-time mixing temperature, real-time feeding rate, and real-time stirring rate; and the analysis of the initial raw material information and the real-time mixing information to determine the real-time viscosity information and real-time surface tension information includes:

[0013] Based on the initial viscosity and initial temperature of the solvent, the overall viscosity value is determined according to the real-time mixing temperature, the real-time feeding rate, and the real-time stirring rate.

[0014] Based on the real-time feeding speed and the real-time mixing temperature, the local temperature rise value is determined.

[0015] Based on the overall viscosity value and the local temperature rise value, determine the real-time viscosity information;

[0016] Based on the initial surface tension and initial temperature of the solvent, the overall surface tension value is determined according to the real-time mixing temperature and real-time stirring speed.

[0017] Based on the local temperature rise value, the real-time surface tension information is determined according to the overall surface tension value.

[0018] Based on the initial viscosity and temperature of the solvent, the overall viscosity value is obtained according to the real-time mixing temperature, real-time feeding speed, and real-time stirring speed. Considering the local temperature rise during the mixing of lithium hexafluorophosphate and the solvent, which causes changes in local viscosity and surface tension, real-time viscosity information that comprehensively reflects the viscosity of the mixture formed by the lithium hexafluorophosphate and solvent is obtained based on the overall viscosity value and the local temperature rise value. Furthermore, based on the initial surface tension and temperature of the solvent, the overall surface tension value is obtained according to the real-time mixing temperature and real-time stirring speed. Then, based on the overall surface tension value and the local temperature rise value, real-time surface tension information that comprehensively reflects the surface tension of the mixture formed by the lithium hexafluorophosphate and solvent is determined. Through a detailed analysis of the impact of local temperature rise on viscosity and surface tension, real-time viscosity information and real-time surface tension information that comprehensively reflect changes in viscosity and surface tension are obtained, making the subsequent bubble content calculated based on the real-time viscosity information and real-time surface tension information more accurate.

[0019] Optionally, determining the overall viscosity value based on the initial solvent viscosity and initial solvent temperature, according to the real-time mixing temperature, the real-time feeding rate, and the real-time stirring rate, includes:

[0020] The real-time material concentration is determined based on the real-time feeding rate;

[0021] The real-time shear rate is determined based on the real-time stirring speed.

[0022] Based on the initial viscosity and initial temperature of the solvent, and according to the real-time mixing temperature, the real-time material concentration, and the real-time shear rate, the overall viscosity value is determined using the following formula:

[0023] ;

[0024] in, This refers to the overall viscosity value. The initial viscosity of the solvent. The initial temperature of the solvent. The real-time mixing temperature, To preset activation energy, As a preset gas constant, The preset concentration influence coefficient, The real-time material concentration is [the value of the material]. The preset shear rate influence coefficient, The shear rate, This is a preset flow behavior index.

[0025] Through the above technical solution, the real-time material concentration and real-time shear rate are determined according to the real-time feeding speed and real-time stirring speed, respectively. Based on the initial viscosity and initial temperature of the solvent, a mathematical formula is designed according to the real-time mixing temperature, real-time material concentration and real-time shear rate to comprehensively quantify the influence of temperature, material concentration, shear rate and flow behavior on the overall viscosity, thereby obtaining a comprehensive and accurate overall viscosity value.

[0026] Optionally, determining the local temperature rise value based on the real-time feeding rate and the real-time mixing temperature includes:

[0027] The mass of material fed per unit time is determined based on the real-time feeding speed.

[0028] The local density and local specific heat capacity are determined based on the feed mass per unit time and the real-time material concentration.

[0029] Based on the real-time mixing temperature, and according to the feed mass per unit time, the local density, and the local specific heat capacity, the local temperature rise is determined using the following formula:

[0030] ;

[0031] in, The local temperature rise value is... The real-time mixing temperature, To predetermine the reaction enthalpy, For the local density, The local specific heat capacity, The mass of material fed per unit time. For the preset molar quantity, The real-time material concentration is [value missing].

[0032] The above technical solution determines the feed mass per unit time based on the real-time feeding speed, and determines the local density and local specific heat capacity based on the feed mass per unit time and the real-time material concentration. Based on the real-time mixing temperature, the temperature change caused by the feed mass per unit time, local density, and local specific heat capacity are quantified by mathematical formulas, and an accurate local temperature rise value is obtained. This provides an important data basis for subsequent analysis of the impact of local temperature changes on local viscosity and surface tension.

[0033] Optionally, determining the real-time viscosity information based on the overall viscosity value and the local temperature rise value includes:

[0034] Based on the overall viscosity value, and according to the local temperature rise value, the local viscosity value is determined with reference to the following formula:

[0035] ;

[0036] in, The local viscosity value is... The local temperature rise value is... This refers to the overall viscosity value. To preset activation energy, As a preset gas constant, The real-time mixing temperature;

[0037] The local viscosity value and the overall viscosity value are used as the real-time viscosity information.

[0038] Through the above technical solution, based on the overall viscosity value and the local temperature rise value, a mathematical formula is designed to quantify the local viscosity change caused by the local temperature change through mathematical analysis, thereby obtaining an accurate local viscosity value. The local viscosity value and the overall viscosity value are used as real-time viscosity information, so that the real-time viscosity information can fully reflect the viscosity value of the current mixture of lithium hexafluorophosphate and solvent, thereby making the bubble content obtained in subsequent analysis more accurate and comprehensive.

[0039] Optionally, the overall surface tension value is determined based on the initial surface tension and initial temperature of the solvent, according to the real-time mixing temperature and real-time stirring speed, with reference to the following formula:

[0040] ;

[0041] in, The overall surface tension value. The initial surface tension of the solvent. The preset temperature influence coefficient, The real-time mixing temperature, The initial temperature of the solvent. The real-time stirring speed is... The coefficient for the influence of the preset stirring speed. The effect of preset stirring speed on the index.

[0042] Through the above technical solution, based on the initial surface tension and initial temperature of the solvent, and according to the real-time mixing temperature and real-time stirring speed, a mathematical formula is used to comprehensively consider the difference between the real-time mixing temperature and the initial temperature of the solvent, as well as the influence of the real-time stirring speed on the overall surface tension, to quantify an accurate overall surface tension value. This makes the obtained overall surface tension value more accurate, and thus makes the overall surface tension value conform to the actual mixing situation of lithium hexafluorophosphate and solvent.

[0043] Optionally, determining the real-time surface tension information based on the overall surface tension value, according to the local temperature rise value, includes:

[0044] The local temperature difference is determined based on the local temperature rise value and the real-time mixing temperature.

[0045] Based on the overall surface tension value and the local temperature difference value, the local surface tension value is determined using the following formula:

[0046] ;

[0047] in, The local surface tension value is... The overall surface tension value. The local temperature difference value. To preset the temperature difference influence coefficient, The preset temperature difference influence index;

[0048] The local surface tension value and the overall surface tension value are used as the real-time surface tension information.

[0049] The above technical solution determines the local temperature difference based on the local temperature rise and real-time mixing temperature. A mathematical formula is designed based on the overall surface tension and the local temperature difference to quantify the impact of the local temperature difference on the local surface tension. Based on the overall surface tension, an accurate local surface tension value is calculated, reflecting the change in local surface tension under the influence of the local temperature difference. The local and overall surface tension values ​​are used as real-time surface tension information, enabling the real-time surface tension information to comprehensively reflect the surface tension value after mixing lithium hexafluorophosphate with the solvent. This further makes the bubble content obtained from subsequent analyses more accurate and comprehensive.

[0050] Optionally, the real-time bubble content is determined based on the real-time viscosity information and the real-time surface tension information, referring to the following formula:

[0051] ;

[0052] in, The real-time bubble content, For the preset correction coefficient, The local surface tension value is... The overall surface tension value. The local viscosity value is... This refers to the overall viscosity value. The effect of viscosity changes on the preset index. The index is set to reflect the effect of tension changes.

[0053] The above technical solution, based on real-time viscosity and surface tension information, uses mathematical analysis to design mathematical formulas to quantify the impact of local viscosity and surface tension changes on real-time bubble content. The results of the mathematical formulas are then corrected using preset correction coefficients to quantify the real-time bubble content, ensuring that the real-time bubble content conforms to the actual mixing conditions of lithium hexafluorophosphate and the solvent, thus improving the accuracy and comprehensiveness of the real-time bubble content.

[0054] Optionally, the final bubble content is determined by analyzing the real-time bubble content and the real-time mixing information, referring to the following formula:

[0055] ;

[0056] in, For the preset mixing time, The final bubble content after a preset mixing time. The real-time feeding speed, The real-time stirring speed is... The real-time bubble content, To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, To preset the bubble generation rate influence index, The index is set to the effect of the preset bubble dissipation rate.

[0057] Based on the real-time bubble content and real-time mixing information, mathematical formulas are designed using mathematical analysis to simulate the bubble generation and dissipation process during the mixing of lithium hexafluorophosphate and solvent. The final bubble content after a preset mixing time is accurately calculated, providing quantitative data support for determining whether there are any abnormalities in the final bubble content.

[0058] Optionally, the step of analyzing the real-time mixing information and the preset normal bubble content to determine the real-time adjustment scheme includes:

[0059] Obtain stirring speed control information and determine the set of stirring speeds;

[0060] Obtain the current mixing time, and based on the preset normal bubble content, the set of stirring speeds, and the preset mixing time, determine the corresponding feeding speed value for each stirring speed value in the set of stirring speeds using the following formula:

[0061] ;

[0062] in, The first in the set of stirring speeds Each stirring speed value, The corresponding feeding speed value. The preset normal bubble content, To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, This is an index representing the effect of the preset stirring speed on the bubble generation rate. This is an index representing the effect of the preset stirring speed on the bubble dissipation rate. The current mixed time, Preset mixing time;

[0063] Substitute each mixing speed value and its corresponding feeding speed value into the following formula to determine the optimal mixing speed value and the optimal feeding speed value:

[0064] ;

[0065] in, The optimal stirring speed value and the optimal feeding speed value are, The real-time mixing temperature, For preset adjustment coefficients, The first in the set of stirring speeds A stirring speed value, For the present The corresponding feeding speed value, The effect index of preset feeding temperature, The effect of preset stirring temperature on the index, Preset safe temperature;

[0066] The optimal stirring speed value and the optimal feeding speed value are determined as the real-time adjustment scheme.

[0067] The above technical solution, based on the preset normal bubble content, stirring speed set, and preset mixing time, uses mathematical analysis to design mathematical formulas to accurately calculate the corresponding feeding speed value for each stirring speed value in the stirring speed set. The optimal stirring speed value and optimal feeding speed value are then extracted using these mathematical formulas as a real-time adjustment scheme. The current real-time stirring speed and real-time feeding speed are adjusted to these optimal values, thus improving mixing efficiency while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate. Attached Figure Description

[0068] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 This is a schematic diagram illustrating an application scenario provided in one embodiment of this application;

[0070] Figure 2 This is a flowchart of an automated control system for mixing and feeding liquid raw materials, provided as an embodiment of this application. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0072] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0073] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0074] In the current batch preparation process of lithium hexafluorophosphate liquid salt, the focus is on monitoring the reaction temperature and feeding rate to ensure safety during the preparation process. However, it is difficult to effectively guarantee the quality of lithium hexafluorophosphate liquid salt during the preparation process. This results in inconsistent quality of lithium-ion battery electrolytes with lithium hexafluorophosphate liquid salt as the main component, which has a negative impact on the performance of lithium-ion batteries.

[0075] Based on this, this application provides an automated control system for mixing and feeding liquid raw materials. By analyzing the initial information of the raw materials and the real-time mixing information, the system determines the real-time viscosity information and the real-time surface tension information. Based on the real-time viscosity information and the real-time surface tension information, the system determines the real-time bubble content. Based on the real-time bubble content and the real-time mixing information, the system analyzes and obtains the final bubble content. By comparing the final bubble content with the preset normal bubble content, the system determines whether there is an abnormality in the final bubble content. If the final bubble content is abnormal, a real-time adjustment scheme is determined and executed based on the real-time mixing information and the preset normal bubble content. This avoids a large number of residual bubbles in the lithium hexafluorophosphate liquid salt obtained after mixing lithium hexafluorophosphate with solvent. During the preparation process of lithium hexafluorophosphate liquid salt, the system ensures the quality of lithium hexafluorophosphate liquid salt, thereby improving the stability of lithium-ion electrolyte with lithium hexafluorophosphate liquid salt as the main component.

[0076] Figure 1 This application provides an illustration of an application scenario. In the mixing process of lithium hexafluorophosphate and solvent, the system provided in this application is used to analyze the initial information of the raw materials and the real-time mixing information, derive a real-time adjustment plan, and control the mixing equipment used to mix lithium hexafluorophosphate and solvent to make corresponding adjustments according to the real-time adjustment plan.

[0077] Specifically, the system of this application is mounted on any server. This server communicates with the mixing equipment, obtains initial raw material information provided by the staff through the server, and obtains real-time mixing information provided by the mixing equipment during the mixing process. By analyzing the initial raw material information and the real-time mixing information, the real-time viscosity information and real-time surface tension information are determined. Based on the real-time viscosity information and real-time surface tension information, the real-time bubble content is determined. Based on the real-time bubble content and the real-time mixing information, the final bubble content is analyzed and obtained. By comparing the final bubble content with the preset normal bubble content, it is determined whether there is any abnormality in the final bubble content. If the final bubble content is abnormal, a real-time adjustment plan is determined and executed based on the real-time mixing information and the preset normal bubble content to avoid a large number of residual bubbles in the lithium hexafluorophosphate liquid salt obtained after mixing lithium hexafluorophosphate with solvent. During the preparation of lithium hexafluorophosphate liquid salt, the quality of lithium hexafluorophosphate liquid salt is guaranteed, thereby improving the stability of lithium-ion electrolyte with lithium hexafluorophosphate liquid salt as the main component.

[0078] For specific implementation details, please refer to the following examples.

[0079] Figure 2 This is a flowchart illustrating an automated control system for mixing and feeding liquid raw materials according to an embodiment of this application. The system in this embodiment can be applied to servers in the above-described scenarios. For example... Figure 2 As shown, the method includes:

[0080] S201. Obtain initial information and real-time mixing information of raw materials, analyze the initial information and real-time mixing information of raw materials, and determine the real-time viscosity information and real-time surface tension information.

[0081] The initial information of the raw materials can be considered as a series of initial relevant information before lithium hexafluorophosphate is mixed with the solvent, such as the initial temperature and initial viscosity of the solvent. The initial information of the raw materials can be provided by the staff.

[0082] Real-time mixing information can be considered as a series of real-time related information during the mixing process of lithium hexafluorophosphate and solvent, such as real-time mixing temperature and real-time stirring speed. Real-time mixing information can be obtained through mixing equipment that mixes lithium hexafluorophosphate and solvent.

[0083] Real-time viscosity information can be considered as real-time information used to express the viscosity of the mixture during the mixing process of lithium hexafluorophosphate and solvent.

[0084] Real-time surface tension information can be considered as real-time information used to express the surface tension of the mixture during the mixing process of lithium hexafluorophosphate and solvent.

[0085] Specifically, in the process of mixing lithium hexafluorophosphate with a solvent to form a liquid lithium hexafluorophosphate salt, the mixture needs to be thoroughly stirred to ensure uniform dissolution of the lithium hexafluorophosphate in the solvent. During stirring, a large number of bubbles are formed in the mixture. Some of these bubbles escape from the mixture during stirring, while others remain trapped, resulting in a large number of bubbles in the final liquid lithium hexafluorophosphate salt. Consequently, the lithium-ion battery electrolyte prepared from the liquid lithium hexafluorophosphate salt contains a large number of bubbles, increasing the internal resistance of the electrolyte, reducing the contact area between the electrolyte and the motor, and causing uneven flow of the electrolyte. This affects battery efficiency, reduces battery life, and may even lead to safety accidents.

[0086] Therefore, by obtaining the initial information of the raw materials, and combining it with the real-time mixing information obtained during the mixing process of lithium hexafluorophosphate and solvent, a series of mathematical analysis methods are used to obtain the real-time viscosity and surface tension information of the mixture during the mixing process of lithium hexafluorophosphate and solvent. This allows for subsequent sequential analysis to reflect the bubble content during the mixing process of lithium hexafluorophosphate and solvent.

[0087] S202. Determine the real-time bubble content based on real-time viscosity and surface tension information.

[0088] Real-time bubble content can be considered as the real-time bubble content during the mixing process of lithium hexafluorophosphate and solvent.

[0089] Specifically, the viscosity of a mixture directly affects the amount of bubbles retained in it. The lower the viscosity, the less resistance bubbles face, and the lower the amount of bubbles retained. Conversely, the higher the viscosity, the higher the amount of bubbles retained. The surface tension of a mixture directly affects the dissipation rate of bubbles. The greater the surface tension, the more difficult it is for bubbles to break and release, resulting in a slower dissipation rate and a higher bubble content. Conversely, the lower the surface tension, the lower the bubble content. Based on these two factors that directly affect bubble content, viscosity and surface tension can be used to accurately determine the real-time bubble content through mathematical analysis.

[0090] S203. Analyze the real-time bubble content and real-time mixing information to determine the final bubble content.

[0091] The final bubble content can be considered as the bubble content in the liquid lithium hexafluorophosphate salt obtained after mixing lithium hexafluorophosphate with the solvent.

[0092] Specifically, after obtaining the real-time bubble content, since the current real-time bubble content cannot represent the bubble content in the final lithium hexafluorophosphate liquid salt obtained after mixing, in order to accurately determine the bubble content in the final lithium hexafluorophosphate liquid salt under the current mixing information, such as the current feeding speed and the current stirring speed, the final bubble content is predicted based on the real-time bubble content and the real-time mixing information through mathematical analysis. This provides necessary data for judging whether the final bubble content meets the usage requirements of lithium hexafluorophosphate liquid salt.

[0093] S204. Compare the final bubble content with the preset normal bubble content to determine whether the final bubble content is abnormal.

[0094] The preset normal bubble content can be considered as the amount of normal bubbles contained in lithium hexafluorophosphate liquid salt without negatively impacting the electrolyte. The preset normal bubble content can be obtained from historical data analysis.

[0095] Specifically, the final bubble content is compared with the preset normal bubble content. If the final bubble content is greater than the preset normal bubble content, it indicates that the final lithium hexafluorophosphate liquid salt has too much bubble content, which will have a negative impact on the electrolyte. In this case, it is judged that the final bubble content is abnormal. Otherwise, the final bubble content is not abnormal.

[0096] S205. If the final bubble content is abnormal, analyze the real-time mixing information and the preset normal bubble content, determine the real-time adjustment plan, and control the mixing equipment to execute the real-time adjustment plan.

[0097] Mixing equipment can be considered as mechanical equipment for mixing lithium hexafluorophosphate with solvents.

[0098] A real-time adjustment scheme can be considered as a scheme that includes real-time mixing information that needs to be adjusted to bring the final bubble content back to the normal range when there is an abnormality in the final bubble content, such as the adjustment scheme for real-time feeding speed and real-time stirring speed.

[0099] Specifically, if the final bubble content obtained from the analysis is abnormal, the real-time mixing information and the preset normal bubble content are analyzed by mathematical analysis to determine the real-time mixing information that needs to be adjusted, such as the real-time feeding speed and the real-time stirring speed. The optimal feeding speed and the optimal stirring speed required to eliminate the abnormal final bubble content are then determined to establish a real-time adjustment plan. Based on the parameters in the real-time adjustment plan, the mixing equipment is controlled to make corresponding adjustments.

[0100] The method provided in this embodiment analyzes the initial information of raw materials and real-time mixing information to determine real-time viscosity information and real-time surface tension information. Based on the real-time viscosity information and real-time surface tension information, the real-time bubble content is determined. Based on the real-time bubble content and real-time mixing information, the final bubble content is analyzed and obtained. By comparing the final bubble content with the preset normal bubble content, it is determined whether there is any abnormality in the final bubble content. If the final bubble content is abnormal, a real-time adjustment plan is determined and executed based on the real-time mixing information and the preset normal bubble content to avoid a large number of residual bubbles in the lithium hexafluorophosphate liquid salt obtained after mixing lithium hexafluorophosphate with solvent. During the preparation process of lithium hexafluorophosphate liquid salt, the quality of lithium hexafluorophosphate liquid salt is guaranteed, thereby improving the stability of lithium-ion electrolyte with lithium hexafluorophosphate liquid salt as the main component.

[0101] In some embodiments, the overall viscosity value is determined based on the initial solvent viscosity and initial solvent temperature, and according to the real-time mixing temperature, real-time feeding speed, and real-time stirring speed; the local temperature rise value is determined based on the real-time feeding speed and the real-time mixing temperature; real-time viscosity information is determined based on the overall viscosity value and the local temperature rise value; the overall surface tension value is determined based on the initial solvent surface tension and initial solvent temperature, and according to the real-time mixing temperature and the real-time stirring speed; and real-time surface tension information is determined based on the local temperature rise value and the overall surface tension value.

[0102] Initial information about the raw materials includes the initial viscosity of the solvent, the initial surface tension of the solvent, and the initial temperature of the solvent.

[0103] Real-time mixing information includes real-time mixing temperature, real-time feeding speed, and real-time stirring speed.

[0104] The initial viscosity of the solvent can be considered as the initial viscosity value before the solvent is mixed with lithium hexafluorophosphate.

[0105] The initial temperature of the solvent can be considered as the initial temperature value before the solvent is mixed with lithium hexafluorophosphate.

[0106] The real-time mixing temperature can be considered as the overall real-time temperature value during the mixing process of the solvent and lithium hexafluorophosphate.

[0107] Real-time feeding speed can be considered as the speed at which solid lithium hexafluorophosphate is added to the solvent during the mixing process of the solvent and lithium hexafluorophosphate.

[0108] Real-time stirring speed can be considered as the speed at which the mixture of solvent and lithium hexafluorophosphate is stirred during the mixing process.

[0109] The overall viscosity value can be considered as the overall viscosity value of the mixture formed by the solvent and lithium hexafluorophosphate during the mixing process.

[0110] The local temperature rise can be considered as the temperature value of the local mixture in the mixture formed by the solvent and lithium hexafluorophosphate that is higher than the real-time mixing temperature.

[0111] The overall surface tension value can be considered as the overall surface tension value of the mixture formed by the solvent and lithium hexafluorophosphate.

[0112] Specifically, the foregoing embodiments explained the direct influence of viscosity and surface tension on bubble content. Furthermore, since the viscosity and surface tension values ​​of the mixture formed by the solvent and lithium hexafluorophosphate are dynamically changing, and this dynamic change is mainly affected by the real-time mixing temperature, real-time feeding speed, and real-time stirring speed, and because the solvation energy (i.e., the energy released during the ion-solvent interaction between lithium hexafluorophosphate and solvent molecules after dissolution) is greater than the energy required to break the lithium hexafluorophosphate lattice, the mixing process of lithium hexafluorophosphate and solvent is exothermic. This makes the real-time temperature representing the overall mixture temperature... The mixing temperature alone cannot fully and accurately reflect the changes in viscosity and surface tension of the mixture. It is necessary to consider the local temperature rise phenomenon that exists in the overall mixing process. The local temperature rise phenomenon mainly occurs during the feeding process. The initial stage of high-purity lithium hexafluorophosphate contact with the solvent will produce obvious local temperature rise phenomenon. The local temperature rise phenomenon leads to changes in local viscosity and surface tension, which in turn affects the bubble content in the mixture. Therefore, in the process of reflecting the bubble content through viscosity and surface tension, in addition to considering the overall viscosity and overall surface tension values ​​of the mixture, it is also necessary to pay close attention to the changes in local viscosity and surface tension caused by local temperature rise phenomenon.

[0113] In summary, based on the initial viscosity and temperature of the solvent, mathematical analysis is performed using real-time mixing temperature, real-time feeding rate, and real-time stirring rate as variables to obtain the overall viscosity value of the mixture formed by the lithium hexafluorophosphate and solvent. Then, based on the real-time feeding rate and real-time mixing temperature, the local temperature rise value is determined. Based on the overall viscosity value and the local temperature rise value, real-time viscosity information including the overall viscosity value and the local viscosity change value is obtained. Simultaneously, based on the initial surface tension and initial temperature of the solvent, mathematical analysis is performed using real-time mixing temperature and real-time stirring rate as variables to obtain the overall surface tension value. Based on the local temperature rise value, real-time surface tension information including the overall surface tension value and the local surface tension change value is determined.

[0114] The method provided in this embodiment, based on the initial viscosity and temperature of the solvent, yields the overall viscosity value according to the real-time mixing temperature, real-time feeding speed, and real-time stirring speed. Simultaneously, considering the local temperature rise phenomenon during the mixing of lithium hexafluorophosphate and the solvent, which causes changes in local viscosity and surface tension, real-time viscosity information that comprehensively reflects the viscosity of the mixture formed by the current mixing of lithium hexafluorophosphate and the solvent is obtained based on the overall viscosity value and the local temperature rise value. Furthermore, based on the initial surface tension and temperature of the solvent, the overall surface tension value is obtained according to the real-time mixing temperature and real-time stirring speed. Then, based on the overall surface tension value and the local temperature rise value, real-time surface tension information that comprehensively reflects the surface tension of the mixture formed by the current mixing of lithium hexafluorophosphate and the solvent is determined. Through a detailed analysis of the impact of local temperature rise on viscosity and surface tension, real-time viscosity information and real-time surface tension information that comprehensively reflect changes in viscosity and surface tension are obtained, making the subsequent bubble content calculated based on the real-time viscosity information and real-time surface tension information more accurate.

[0115] In some embodiments, the real-time material concentration is determined based on the real-time feeding rate; the real-time shear rate is determined based on the real-time stirring rate; and the overall viscosity value is determined based on the initial solvent viscosity and initial solvent temperature, the real-time mixing temperature, the real-time material concentration, and the real-time shear rate, referring to formula (1):

[0116] (1)

[0117] in, This is the overall viscosity value. The initial viscosity of the solvent. The initial temperature of the solvent. For real-time mixing temperature, To preset activation energy, As a preset gas constant, The preset concentration influence coefficient, For real-time material concentration, The preset shear rate influence coefficient, For shear rate, This is a preset flow behavior index.

[0118] Real-time material concentration can be considered as the concentration of lithium hexafluorophosphate in the current mixture of lithium hexafluorophosphate and solvent.

[0119] Real-time shear rate can be considered as the degree of shear deformation that occurs inside the mixture during the stirring process of the mixture of lithium hexafluorophosphate and solvent.

[0120] The preset activation energy can be considered as the energy barrier that needs to be overcome to form a liquid lithium hexafluorophosphate salt after mixing lithium hexafluorophosphate with a solvent. The preset activation energy can be obtained by analyzing experimental data on the mixing of lithium hexafluorophosphate and solvent.

[0121] The preset gas constant can be considered as a physical constant describing the properties of a gas, and the preset gas constant can be a universal gas constant.

[0122] The preset concentration influence coefficient can be considered as a coefficient used to express the degree of influence of lithium hexafluorophosphate concentration on the viscosity of the mixture. The preset concentration influence coefficient can be obtained by analyzing historical data.

[0123] The preset shear rate influence coefficient can be considered as a coefficient used to express the degree of influence of real-time shear rate on the viscosity of the mixture. The preset shear rate influence coefficient can be obtained by analyzing historical data.

[0124] The preset flow behavior index can be considered as the influence index of the flow behavior of the mixture during the stirring process on the viscosity of the mixture under the influence of real-time shear rate. The preset flow behavior index is obtained by analyzing the mixing experimental data of lithium hexafluorophosphate and solvent.

[0125] Specifically, the real-time feeding rate reflects the amount of lithium hexafluorophosphate added to the solvent per unit time. Based on the current feeding time, the real-time material concentration can be obtained according to the real-time feeding rate. At the same time, since the increase in stirring speed will lead to the increase in the internal flow intensity of the mixture, it will affect the magnitude of the shear rate. Based on the linear relationship between stirring speed and shear rate, historical data can be analyzed to obtain the corresponding shear rate under different stirring speeds. Then, the real-time shear rate can be determined based on the real-time stirring speed.

[0126] Furthermore, through formula (1) Describes the change in overall viscosity of a lithium hexafluorophosphate and solvent mixture relative to temperature, based on the initial solvent viscosity. The effect of lithium hexafluorophosphate concentration on overall viscosity is described by... The effects of shear rate and flow behavior on overall viscosity are described. The effects of temperature, material concentration, shear rate and flow behavior on overall viscosity are comprehensively quantified by formula (1), and then a comprehensive and accurate overall viscosity value is obtained.

[0127] The method provided in this embodiment determines the real-time material concentration and real-time shear rate based on the real-time feeding speed and real-time stirring speed, respectively. Based on the initial solvent viscosity and initial solvent temperature, a mathematical formula is designed according to the real-time mixing temperature, real-time material concentration, and real-time shear rate to comprehensively quantify the influence of temperature, material concentration, shear rate, and flow behavior on the overall viscosity, thereby obtaining a comprehensive and accurate overall viscosity value.

[0128] In some embodiments, the feed mass per unit time is determined based on the real-time feeding rate; the local density and local specific heat capacity are determined based on the feed mass per unit time and the real-time material concentration; and the local temperature rise is determined based on the real-time mixing temperature, the feed mass per unit time, the local density, and the local specific heat capacity, referring to formula (2).

[0129] (2)

[0130] in, This is the local temperature rise value. For real-time mixing temperature, To predetermine the reaction enthalpy, For local density, For local specific heat capacity, The mass of materials fed per unit time. For the preset molar quantity, This represents the real-time material concentration.

[0131] The mass of material fed per unit time can be considered as the mass of lithium hexafluorophosphate added to the solvent per unit time, and the mass of material fed per unit time can be obtained through the preset parameters of the mixing equipment.

[0132] Local density can be considered as the initial stage of lithium hexafluorophosphate contact with the solvent. It is the local density value when lithium hexafluorophosphate is not uniformly mixed with the solvent. The local density value can be obtained from the density value corresponding to the current unit time feed mass and real-time material concentration in historical data.

[0133] Local specific heat capacity can be considered as the initial stage of lithium hexafluorophosphate contact with the solvent. The local specific heat capacity value is the value when lithium hexafluorophosphate is not uniformly mixed with the solvent. The local specific heat capacity value can be obtained from the specific heat capacity value corresponding to the current unit time feed mass and real-time material concentration in historical data.

[0134] The preset enthalpy of reaction can be considered as a physical quantity describing the heat release during the initial mixing of lithium hexafluorophosphate and solvent. The preset enthalpy of reaction can be determined through mixing experiments of lithium hexafluorophosphate and solvent.

[0135] The preset molar amount can be considered as the molar amount corresponding to the mass of lithium hexafluorophosphate added to the solvent per unit time. The preset molar amount can be obtained by multiplying the standard molar amount of lithium hexafluorophosphate by the mass of material added per unit time.

[0136] Specifically, through formula (1) This reflects the energy released by lithium hexafluorophosphate per unit time during the initial stage of contact with the solvent, through... This reflects the total energy required to raise the temperature per unit time by using lithium hexafluorophosphate. Based on the real-time mixing temperature, the temperature change caused by the addition of lithium hexafluorophosphate per unit time is accumulated to obtain the accurate local temperature rise value.

[0137] The method provided in this embodiment determines the mass of material fed per unit time based on the real-time feeding rate, and determines the local density and local specific heat capacity based on the mass of material fed per unit time and the real-time material concentration. Based on the real-time mixing temperature, the amount of temperature change caused by the lithium hexafluorophosphate fed per unit time is quantified by mathematical formulas according to the mass of material fed per unit time, local density, and local specific heat capacity, and an accurate local temperature rise value is obtained. This provides an important data basis for subsequent analysis of the impact of local temperature changes on local viscosity and surface tension.

[0138] In some embodiments, based on the overall viscosity value, the local viscosity value is determined according to the local temperature rise value, with reference to the following formula (3):

[0139] (3)

[0140] in, This is the local viscosity value. This is the local temperature rise value. This is the overall viscosity value. To preset activation energy, As a preset gas constant, The mixing temperature is set in real time; local viscosity values ​​and overall viscosity values ​​are used as real-time viscosity information.

[0141] Local viscosity can be considered as the local viscosity value affected by local temperature rise.

[0142] Specifically, through formula (3) This reflects the degree to which temperature changes affect local viscosity values, and is achieved through... It reflects the influence of the difference between local temperature and overall temperature on local viscosity, and then uses formula (3) to describe the local viscosity change caused by local temperature change on the basis of overall viscosity value, so as to obtain accurate local viscosity value, and use local viscosity value and overall viscosity value as real-time viscosity information.

[0143] The method provided in this implementation, based on the overall viscosity value and the local temperature rise value, uses mathematical analysis to design a mathematical formula to quantify the local viscosity change caused by the local temperature change, thereby obtaining an accurate local viscosity value. The local viscosity value and the overall viscosity value are used as real-time viscosity information, so that the real-time viscosity information can fully reflect the viscosity value of the current mixture of lithium hexafluorophosphate and solvent, thereby making the bubble content obtained in subsequent analysis more accurate and comprehensive.

[0144] In some embodiments, the overall surface tension value is determined based on the initial surface tension and initial temperature of the solvent, according to the real-time mixing temperature and real-time stirring speed, with reference to formula (4):

[0145] (4)

[0146] in, This represents the overall surface tension value. The initial surface tension of the solvent, The preset temperature influence coefficient, For real-time mixing temperature, The initial temperature of the solvent. For real-time stirring speed, The coefficient for the influence of the preset stirring speed. The effect of preset stirring speed on the index.

[0147] The preset temperature influence coefficient can be considered as a coefficient value used to express the linear influence of the temperature difference between the real-time mixing temperature and the initial temperature of the solvent on the overall surface tension value. The preset temperature influence coefficient can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0148] The preset stirring speed influence coefficient can be considered as a coefficient value used to express the linear influence of real-time stirring speed on the overall surface tension value. The preset stirring speed influence coefficient can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0149] The preset stirring speed influence index can be considered as an index value used to express the nonlinear influence of real-time stirring speed on the overall surface tension value. The preset stirring speed influence index can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0150] Specifically, through formula (4) This reflects the effect of temperature rise on the overall surface tension value under the condition of initial solvent surface tension, and is expressed through... It reflects the effect of real-time stirring speed on the overall surface tension value, and provides a comprehensive and accurate result for the overall surface tension value.

[0151] The method provided in this embodiment, based on the initial surface tension and initial temperature of the solvent, and according to the real-time mixing temperature and real-time stirring speed, uses mathematical formulas to comprehensively consider the difference between the real-time mixing temperature and the initial temperature of the solvent, as well as the influence of the real-time stirring speed on the overall surface tension, to quantify an accurate overall surface tension value. This makes the obtained overall surface tension value more accurate, and thus makes the overall surface tension value conform to the actual mixing situation of lithium hexafluorophosphate and solvent.

[0152] In some embodiments, the local temperature difference is determined based on the local temperature rise and the real-time mixing temperature; the local surface tension is determined based on the overall surface tension and the local temperature difference, referring to formula (5):

[0153] (5)

[0154] in, This represents the local surface tension value. This represents the overall surface tension value. This represents the local temperature difference. To preset the temperature difference influence coefficient, The preset temperature difference influence index is used; the local surface tension value and the overall surface tension value are used as real-time surface tension information.

[0155] The local temperature difference can be considered as the temperature difference between the local temperature rise and the real-time mixing temperature.

[0156] The preset temperature difference influence coefficient can be considered as a coefficient value used to express the linear effect of local temperature difference on surface tension. The preset temperature difference influence coefficient can be obtained through a mixing experiment of lithium hexafluorophosphate and solvent.

[0157] The preset temperature difference influence index can be considered as an index value used to express the nonlinear influence of local temperature difference on surface tension. The preset temperature difference influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and solvent.

[0158] Specifically, based on the overall surface tension value, the influence of local temperature difference on local surface tension is introduced, and then mathematical analysis is used to calculate the local surface tension value under the influence of local temperature difference using formula (5), and the local surface tension value and the overall surface tension value are used as real-time surface tension information.

[0159] The method provided in this embodiment determines the local temperature difference based on the local temperature rise and real-time mixing temperature. A mathematical formula is designed based on the overall surface tension and the local temperature difference to quantify the impact of the local temperature difference on the local surface tension. Based on the overall surface tension, an accurate local surface tension value is calculated, reflecting the change in local surface tension under the influence of the local temperature difference. The local and overall surface tension values ​​are used as real-time surface tension information, enabling the real-time surface tension information to comprehensively reflect the surface tension value after mixing lithium hexafluorophosphate with the solvent. This further makes the bubble content obtained from subsequent analyses more accurate and comprehensive.

[0160] In some embodiments, the real-time bubble content is determined based on real-time viscosity information and real-time surface tension information, referring to formula (6):

[0161] (6)

[0162] in, This represents the real-time bubble content. For the preset correction coefficient, This represents the local surface tension value. This represents the overall surface tension value. This is the local viscosity value. This is the overall viscosity value. The effect of viscosity changes on the preset index. The index is set to reflect the effect of tension changes.

[0163] The preset correction coefficient can be considered as the proportional relationship used to correct the formula (6) to ensure that the result of formula (6) can accurately reflect the actual bubble content. The preset correction coefficient can be obtained from the mixing experiment of lithium hexafluorophosphate and solvent or historical data.

[0164] The preset viscosity change influence index can be considered as the influence index of local viscosity change on real-time bubble content. The preset viscosity change influence index can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0165] The preset tension change influence index can be considered as the influence index of local surface tension changes on real-time bubble content. The preset tension change influence index can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0166] Specifically, through formula (6) Reflecting the change in local viscosity value relative to the overall viscosity value, and simultaneously through It reflects the change of local surface tension value relative to the overall surface tension value, and reflects the influence of local viscosity change and local surface tension change on real-time bubble content by introducing a preset viscosity change influence index and a preset tension change influence index. Finally, the result of formula (6) is corrected by a preset correction coefficient to quantify the accurate real-time bubble content.

[0167] The method provided in this embodiment, based on real-time viscosity information and real-time surface tension information, uses mathematical analysis to design mathematical formulas to quantify the impact of local viscosity changes and local surface tension changes on real-time bubble content. The results of the mathematical formulas are then corrected using preset correction coefficients to quantify the real-time bubble content, ensuring that the real-time bubble content conforms to the actual mixing conditions of lithium hexafluorophosphate and solvent, thereby improving the accuracy and comprehensiveness of the real-time bubble content.

[0168] In some embodiments, the final bubble content is determined by analyzing real-time bubble content and real-time mixing information, referring to formula (7):

[0169] (7)

[0170] in, For the preset mixing time, This refers to the final bubble content after a preset mixing time. For real-time feeding speed, For real-time stirring speed, This represents the real-time bubble content. To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, To preset the bubble generation rate influence index, The index is set to the effect of the preset bubble dissipation rate.

[0171] The preset mixing time can be considered as the preset mixing time required to mix lithium hexafluorophosphate with solvent to obtain lithium hexafluorophosphate liquid salt. The preset mixing time can be set by the staff.

[0172] The preset bubble generation rate constant can be considered as the parameter that affects the current real-time feeding speed and stirring speed on the bubble generation rate. The preset bubble generation rate constant can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0173] The preset bubble dissipation rate constant can be considered as the parameter that affects the current real-time stirring speed on the bubble dissipation rate. The preset bubble dissipation rate constant can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0174] The preset bubble generation rate influence index can be considered as the influence index of real-time stirring speed on the bubble generation rate in the mixture formed by lithium hexafluorophosphate and solvent.

[0175] The preset bubble dissipation rate influence index can be considered as the influence index of the real-time stirring speed on the bubble dissipation rate in the mixture formed by lithium hexafluorophosphate and solvent.

[0176] Specifically, during the mixing process of lithium hexafluorophosphate and solvent, the change in bubble content can generally be regarded as a combined generation and dissipation process, as shown in formula (7). Reflecting the steady-state bubble content under the current real-time feeding and stirring speeds, considering the corresponding bubble generation and dissipation rates, through... It reflects the difference between real-time bubble content and steady-state bubble content, and then uses an exponential decay factor. This indicates that after the preset mixing time, as the real-time stirring speed and the bubble dissipation speed tend to 0, the final bubble content gradually stabilizes. In summary, the final bubble content after the preset mixing time can be obtained through formula (7).

[0177] The method provided in this embodiment, based on real-time bubble content and real-time mixing information, uses mathematical analysis to design mathematical formulas to simulate the bubble generation and dissipation process during the mixing of lithium hexafluorophosphate and solvent. It accurately calculates the final bubble content after a preset mixing time, providing quantitative data support for determining whether there are any abnormalities in the final bubble content.

[0178] In some embodiments, stirring speed information is obtained to determine a set of stirring speeds; the current mixing time is obtained, and based on the preset normal bubble content, the set of stirring speeds, and the preset mixing time, the corresponding feeding speed value for each stirring speed value in the set of stirring speeds is determined by referring to formula (8):

[0179] (8)

[0180] in, The first in the set of stirring speeds Each stirring speed value, To match the feeding speed value, To preset the normal bubble content, To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, This is an index representing the effect of the preset stirring speed on the bubble generation rate. This is an index representing the effect of the preset stirring speed on the bubble dissipation rate. For the current mixed time, Preset mixing time;

[0181] Substitute each stirring speed value and its corresponding feeding speed value into formula (9) to determine the optimal stirring speed value and the optimal feeding speed value:

[0182] (9)

[0183] in, For the optimal mixing speed and optimal feeding speed, For real-time mixing temperature, For preset adjustment coefficients, The first in the set of stirring speeds A stirring speed value, For the present The corresponding feeding speed value, The effect index of preset feeding temperature, The effect of preset stirring temperature on the index, To preset a safe temperature, the optimal stirring speed and optimal feeding speed are determined as a real-time adjustment scheme.

[0184] The stirring speed control information can be considered as the stirring speed range information corresponding to the stirring equipment currently used for mixing lithium hexafluorophosphate and solvent. The stirring speed control information can be provided by the staff.

[0185] The set of stirring speeds can be considered as a set of stirring speed values ​​obtained by dividing the stirring speed regulation information.

[0186] The current mixing time can be considered as the mixing time that lithium hexafluorophosphate and solvent have undergone.

[0187] The matching feeding speed value can be considered as the feeding speed value corresponding to each stirring speed value within the stirring speed set, under the premise of ensuring normal bubble content.

[0188] The optimal stirring speed can be considered as the best stirring speed under the premise of ensuring normal bubble content and mixing efficiency.

[0189] The optimal feeding speed can be considered as the best feeding speed under the premise of ensuring normal bubble content and mixing efficiency.

[0190] The preset adjustment coefficient can be considered as the influence coefficient of the feeding speed and stirring speed on the temperature of the mixture of lithium hexafluorophosphate and solvent. The preset adjustment coefficient can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0191] The preset feeding temperature influence index can be considered as the influence index of the feeding rate on the temperature of the mixture of lithium hexafluorophosphate and solvent. The preset feeding temperature influence index can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0192] The preset stirring temperature influence index can be considered as the influence index of stirring speed on the temperature of the mixture of lithium hexafluorophosphate and solvent. The preset stirring temperature influence index can be obtained through mixing experiments of lithium hexafluorophosphate and solvent.

[0193] The preset safe temperature can be considered as the maximum temperature that can be achieved under the premise of ensuring safety during the mixing of lithium hexafluorophosphate and solvent. The preset safe temperature can be obtained by analyzing historical data.

[0194] Specifically, through formula (8) Under a preset normal bubble content, the basic coefficient is calculated based on the bubble generation and dissipation rate constants, and then... At the current stirring speed, the equilibrium point between bubble formation and dissipation is reached through... It reflects the ratio between the current mixing time and the preset mixing time, serving as a time influence factor. It reflects the impact of different mixing times on the corresponding feeding speed of the current stirring speed. Based on each stirring speed value, the corresponding feeding speed is calculated to ensure that the bubble content is within the normal range when the preset mixing time is reached.

[0195] Furthermore, after obtaining several stirring speed values ​​and their corresponding feeding speeds, it is necessary to determine the optimal stirring speed and optimal feeding speed as the basis for adjustment. Through formula (9), the temperature value after the stirring speed value and the corresponding feeding speed affect the temperature of the lithium hexafluorophosphate and solvent mixture is limited, and it is limited to not exceeding the preset safe temperature. Under the above constraints, the maximum stirring speed value and its corresponding feeding speed value are extracted, and the maximum stirring speed value and its corresponding feeding speed value are respectively used as the optimal stirring speed and optimal feeding speed. The optimal stirring speed value and optimal feeding speed value are determined as the real-time adjustment scheme. According to the real-time adjustment scheme, the current real-time stirring speed and real-time feeding speed are adjusted to the optimal stirring speed value and optimal feeding speed value, so as to improve the mixing efficiency while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate.

[0196] The method provided in this embodiment, based on a preset normal bubble content, a set of stirring speeds, and a preset mixing time, uses mathematical analysis to design mathematical formulas to accurately calculate the corresponding feeding speed value for each stirring speed value in the set of stirring speeds. Furthermore, the optimal stirring speed value and the optimal feeding speed value are extracted using these mathematical formulas as a real-time adjustment scheme. The current real-time stirring speed and real-time feeding speed are then adjusted to the optimal stirring speed value and the optimal feeding speed value, thereby improving mixing efficiency while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate.

Claims

1. An automated control system for mixing and feeding liquid raw materials, characterized in that, include: Acquire initial raw material information and real-time mixing information, analyze the initial raw material information and the real-time mixing information, and determine real-time viscosity information and real-time surface tension information; The real-time bubble content is determined based on the real-time viscosity information and the real-time surface tension information; Analyze the real-time bubble content and the real-time mixing information to determine the final bubble content; The final bubble content is compared with the preset normal bubble content to determine whether the final bubble content is abnormal. If the final bubble content is abnormal, analyze the real-time mixing information and the preset normal bubble content, determine the real-time adjustment plan, and control the mixing equipment to execute the real-time adjustment plan; The real-time mixing information includes real-time mixing temperature, real-time feeding speed, and real-time stirring speed; The final bubble content is determined by analyzing the real-time bubble content and the real-time mixing information, referring to the following formula: ; in, For the preset mixing time, The final bubble content after a preset mixing time. The real-time feeding speed, The real-time stirring speed is... The real-time bubble content, To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, To preset the bubble generation rate influence index, The index is set to the effect of the preset bubble dissipation rate.

2. The system according to claim 1, characterized in that, The initial information of the raw materials includes the initial viscosity of the solvent, the initial surface tension of the solvent, and the initial temperature of the solvent. The analysis of the initial information of the raw materials and the real-time mixing information to determine the real-time viscosity information and the real-time surface tension information includes: Based on the initial viscosity and initial temperature of the solvent, the overall viscosity value is determined according to the real-time mixing temperature, the real-time feeding rate, and the real-time stirring rate. Based on the real-time feeding speed and the real-time mixing temperature, the local temperature rise value is determined. Based on the overall viscosity value and the local temperature rise value, determine the real-time viscosity information; Based on the initial surface tension and initial temperature of the solvent, the overall surface tension value is determined according to the real-time mixing temperature and real-time stirring speed. Based on the local temperature rise value, the real-time surface tension information is determined according to the overall surface tension value.

3. The system according to claim 2, characterized in that, The determination of the overall viscosity value based on the initial viscosity and initial temperature of the solvent, according to the real-time mixing temperature, the real-time feeding rate, and the real-time stirring rate, includes: The real-time material concentration is determined based on the real-time feeding rate; The real-time shear rate is determined based on the real-time stirring speed. Based on the initial viscosity and initial temperature of the solvent, and according to the real-time mixing temperature, the real-time material concentration, and the real-time shear rate, the overall viscosity value is determined using the following formula: ; in, This refers to the overall viscosity value. The initial viscosity of the solvent. The initial temperature of the solvent. The real-time mixing temperature, To preset activation energy, As a preset gas constant, The preset concentration influence coefficient, The real-time material concentration is [the value of the material]. The preset shear rate influence coefficient, The shear rate, This is a preset flow behavior index.

4. The system according to claim 3, characterized in that, The determination of the local temperature rise value based on the real-time feeding speed and the real-time mixing temperature includes: The mass of material fed per unit time is determined based on the real-time feeding speed. The local density and local specific heat capacity are determined based on the feed mass per unit time and the real-time material concentration. Based on the real-time mixing temperature, and according to the feed mass per unit time, the local density, and the local specific heat capacity, the local temperature rise is determined using the following formula: ； in, The local temperature rise value is... The real-time mixing temperature, To predetermine the reaction enthalpy, For the local density, The local specific heat capacity, The mass of material fed per unit time. For the preset molar quantity, The real-time material concentration is [value missing].

5. The system according to claim 4, characterized in that, The step of determining real-time viscosity information based on the overall viscosity value and the local temperature rise value includes: Based on the overall viscosity value, and according to the local temperature rise value, the local viscosity value is determined with reference to the following formula: ； in, The local viscosity value is... The local temperature rise value is... This refers to the overall viscosity value. To preset activation energy, As a preset gas constant, The real-time mixing temperature; The local viscosity value and the overall viscosity value are used as the real-time viscosity information.

6. The system according to claim 5, characterized in that, The overall surface tension value is determined based on the initial surface tension and initial temperature of the solvent, according to the real-time mixing temperature and real-time stirring speed, with reference to the following formula: ； in, The overall surface tension value. The initial surface tension of the solvent. The preset temperature influence coefficient, The real-time mixing temperature, The initial temperature of the solvent. The real-time stirring speed is... The coefficient for the influence of the preset stirring speed. The effect of preset stirring speed on the index.

7. The system according to claim 6, characterized in that, The determination of real-time surface tension information based on the local temperature rise value and the overall surface tension value includes: The local temperature difference is determined based on the local temperature rise value and the real-time mixing temperature. Based on the overall surface tension value and the local temperature difference value, the local surface tension value is determined using the following formula: ； in, The local surface tension value is... The overall surface tension value. The local temperature difference value. To preset the temperature difference influence coefficient, The preset temperature difference influence index; The local surface tension value and the overall surface tension value are used as the real-time surface tension information.

8. The system according to claim 7, characterized in that, The real-time bubble content is determined based on the real-time viscosity information and the real-time surface tension information, referring to the following formula: ； in, The real-time bubble content, For the preset correction coefficient, The local surface tension value is... The overall surface tension value. The local viscosity value is... This refers to the overall viscosity value. The effect of viscosity changes on the preset index. The index is set to reflect the effect of tension changes.

9. The system according to claim 8, characterized in that, The analysis of the real-time mixing information and the preset normal bubble content to determine the real-time adjustment scheme includes: Obtain stirring speed control information and determine the set of stirring speeds; Obtain the current mixing time, and based on the preset normal bubble content, the set of stirring speeds, and the preset mixing time, determine the corresponding feeding speed value for each stirring speed value in the set of stirring speeds using the following formula: ； in, The first in the set of stirring speeds Each stirring speed value, The corresponding feeding speed value. The preset normal bubble content, To preset the bubble generation rate constant, As a preset bubble dissipation rate constant, To preset the bubble generation rate influence index, To preset the influence index of bubble dissipation rate, The current mixed time, Preset mixing time; Substitute each mixing speed value and its corresponding feeding speed value into the following formula to determine the optimal mixing speed value and the optimal feeding speed value: ； in, The optimal stirring speed value and the optimal feeding speed value are, The real-time mixing temperature, For preset adjustment coefficients, The first in the set of stirring speeds A stirring speed value, For the present The corresponding feeding speed value, The effect index of preset feeding temperature, The effect of preset stirring temperature on the index, Preset safe temperature; The optimal stirring speed value and the optimal feeding speed value are determined as the real-time adjustment scheme.

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