Automatic control system for mixed feeding of liquid raw materials

Abstract

The invention relates to the technical field of automatic control, in particular to an automatic control system for liquid raw material mixing and feeding. The method 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, and determining real-time viscosity information and real-time surface tension information; determining real-time bubble content according to the real-time viscosity information and the real-time surface tension information; the real-time bubble content and the real-time mixing information are analyzed, and the final bubble content is determined; comparing the final bubble content with a preset normal bubble content, and judging whether the final bubble content is abnormal or not; and if the final bubble content is abnormal, analyzing the real-time mixing information and a preset normal bubble content, determining a real-time adjustment scheme, and controlling the mixing equipment to execute the real-time adjustment scheme. In the preparation process of the lithium hexafluorophosphate liquid salt, a large number of bubbles are prevented from being left in the lithium hexafluorophosphate liquid salt, and then the stability of the lithium ion electrolyte is improved.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to an automatic control system for mixing and feeding liquid raw materials. Background Art

[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 the advantages of high electrochemical stability, wide temperature range and high conductivity, and are widely used in commercial lithium-ion batteries.

[0003] In the existing batch preparation process of lithium hexafluorophosphate liquid salt, the focus is on monitoring the reaction temperature and the feeding rate to ensure the safety of the lithium hexafluorophosphate liquid salt preparation process. However, it is difficult to effectively ensure the quality of the lithium hexafluorophosphate liquid salt during the preparation process, resulting in uneven quality of subsequent 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] The present 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, the present application provides an automated control system for mixing and feeding liquid raw materials, the system comprising: Acquiring initial raw material information and real-time mixing information, analyzing the initial raw material information and the real-time mixing information, and determining real-time viscosity information and real-time surface tension information; Determining real-time bubble content according to the real-time viscosity information and the real-time surface tension information; Analyzing the real-time bubble content and the real-time mixing information to determine a final bubble content; Comparing the final bubble content with a preset normal bubble content to determine whether the final bubble content is abnormal; If the final bubble content is abnormal, the real-time mixing information and the preset normal bubble content are analyzed to determine a real-time adjustment plan, and the mixing device is controlled to execute the real-time adjustment plan.

[0006] The present application determines real-time viscosity information and real-time surface tension information by analyzing initial information and real-time mixing information of raw materials, determines real-time bubble content according to the real-time viscosity information and real-time surface tension information, and obtains final bubble content through analysis based on the real-time bubble content and real-time mixing information, and determines whether the final bubble content is abnormal by comparing the final bubble content with a preset normal bubble content. If the final bubble content is abnormal, a real-time adjustment plan is determined and executed according to the real-time mixing information and the preset normal bubble content, so as to avoid a large amount of bubbles remaining in the lithium hexafluorophosphate liquid salt obtained by mixing lithium hexafluorophosphate with a solvent, and ensure the quality of the lithium hexafluorophosphate liquid salt during the preparation process of the lithium hexafluorophosphate liquid salt, thereby improving the stability of the lithium ion electrolyte with the lithium hexafluorophosphate liquid salt as the main component.

[0007] Optionally, the initial raw material information includes initial solvent viscosity, initial solvent surface tension and initial solvent temperature, the real-time mixing information includes real-time mixing temperature, real-time feeding speed and real-time stirring speed, and the analyzing the initial raw material information 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 solvent viscosity and the initial solvent temperature, the overall viscosity value is determined according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed; Based on the real-time feeding speed and the real-time mixing temperature, determining a local temperature rise value; Determining real-time viscosity information according to the overall viscosity value and the local temperature rise value; Based on the initial surface tension of the solvent and the initial temperature of the solvent, determining the overall surface tension value according to the real-time mixing temperature and the real-time stirring speed; Based on the local temperature rise value, real-time surface tension information is determined according to the overall surface tension value.

[0008] Through the above technical scheme, on the basis of the initial viscosity and initial temperature of the solvent, the overall viscosity value is obtained according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed. At the same time, considering that there is a local temperature rise phenomenon in the mixing process of lithium hexafluorophosphate and the solvent, and the local temperature rise phenomenon will cause changes in local viscosity and surface tension, the real-time viscosity information that can fully reflect the viscosity of the mixture formed by the current mixing of lithium hexafluorophosphate and the solvent is obtained according to the overall viscosity value and the local temperature rise value. Further, on the basis of the initial surface tension and initial temperature of the solvent, the overall surface tension value is obtained according to the real-time mixing temperature and the real-time stirring speed. Then, according to the overall surface tension value and the local temperature rise value, the real-time surface tension information that can fully reflect 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 influence of the local temperature rise phenomenon on the viscosity and the surface tension, the real-time viscosity information and the real-time surface tension information that can fully reflect the changes in viscosity and surface tension are obtained, so that the bubble content subsequently obtained based on the real-time viscosity information and the real-time surface tension information is more accurate.

[0009] Optionally, the determining of the overall viscosity value based on the initial viscosity of the solvent and the initial temperature of the solvent according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed comprises: Determining the real-time material concentration according to the real-time feeding speed; Determining a real-time shear rate according to the real-time stirring speed; Based on the initial solvent viscosity and the initial solvent temperature, according to the real-time mixing temperature, the real-time material concentration and the real-time shear rate, the overall viscosity value is determined with reference to the following formula: ; in, is the overall viscosity value, is the initial viscosity of the solvent, is the initial temperature of the solvent, is the real-time mixing temperature, is the preset activation energy, is the preset gas constant, is the preset concentration influence coefficient, is the real-time material concentration, is the preset shear rate influence coefficient, is the shear rate, is the preset flow behavior index.

[0010] Through the above technical scheme, the real-time material concentration and the real-time shear rate are determined respectively according to the real-time feeding speed and the real-time stirring speed. On the basis of the initial viscosity of the solvent and the initial temperature of the solvent, a mathematical formula is designed according to the real-time mixing temperature, the real-time material concentration and the real-time shear rate to comprehensively quantify the effects of temperature, material concentration, shear rate and flow behavior on the overall viscosity, thereby obtaining a comprehensive and accurate overall viscosity value.

[0011] Optionally, determining the local temperature rise value based on the real-time feeding speed and according to the real-time mixing temperature includes: Determine the feeding mass per unit time according to the real-time feeding speed; Determine the local density and the local specific heat capacity according to the feeding mass per unit time and the real-time material concentration; Based on the real-time mixing temperature, according to the feeding mass per unit time, the local density and the local specific heat capacity, the local temperature rise value is determined with reference to the following formula: ; in, is the local temperature rise value, is the real-time mixing temperature, is the preset reaction enthalpy, is the local density, is the local specific heat capacity, is the feeding mass per unit time, is the preset molar amount, is the real-time material concentration.

[0012] Through the above technical scheme, the feeding mass per unit time is determined according to the real-time feeding speed, and the local density and local specific heat capacity are determined according to the feeding mass per unit time and the real-time material concentration. On the basis of the real-time mixing temperature, according to the feeding mass per unit time, the local density and the local specific heat capacity, the temperature change caused by the lithium hexafluorophosphate fed per unit time is quantified through a mathematical formula, and an accurate local temperature rise value is obtained, which provides an important data basis for the subsequent analysis of the influence of local temperature changes on local viscosity and surface tension.

[0013] Optionally, determining the real-time viscosity information according to the overall viscosity value and the local temperature rise value includes: Based on the overall viscosity value, according to the local temperature rise value, refer to the following formula to determine the local viscosity value: ; in, is the local viscosity value, is the local temperature rise value, is the overall viscosity value, is the preset activation energy, is the preset gas constant, is the real-time mixing temperature; The local viscosity value and the overall viscosity value are used as the real-time viscosity information.

[0014] Through the above technical scheme, based on the overall viscosity value and according to the local temperature rise value, a mathematical formula is designed through mathematical analysis to quantify the local viscosity change caused by the local temperature change, and then an accurate local viscosity value is obtained. 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 current viscosity value of lithium hexafluorophosphate after mixing with the solvent, thereby making the bubble content obtained by subsequent analysis more accurate and comprehensive.

[0015] Optionally, the overall surface tension value is determined based on the initial surface tension of the solvent and the initial temperature of the solvent, according to the real-time mixing temperature and the real-time stirring speed, with reference to the following formula: ; in, is the overall surface tension value, is the initial surface tension of the solvent, is the preset temperature influence coefficient, is the real-time mixing temperature, is the initial temperature of the solvent, is the real-time stirring speed, is the influence coefficient of preset stirring speed, It is the influence index of preset stirring speed.

[0016] Through the above technical scheme, on the basis of the initial surface tension of the solvent and the initial temperature of the solvent, according to the real-time mixing temperature and the real-time stirring speed, through a mathematical formula, the difference between the real-time mixing temperature and the initial temperature of the solvent and the influence of the real-time stirring speed on the overall surface tension are comprehensively considered, and an accurate overall surface tension value is quantified, so that the overall surface tension value is more accurate, and thus the overall surface tension value is consistent with the actual mixing conditions of lithium hexafluorophosphate and the solvent.

[0017] Optionally, determining the real-time surface tension information based on the local temperature rise value and the overall surface tension value includes: Determining a local temperature difference according to the local temperature rise value and the real-time mixed temperature; According to the overall surface tension value and the local temperature difference value, the local surface tension value is determined by referring to the following formula: ; in, is the local surface tension value, is the overall surface tension value, is the local temperature difference, is the preset temperature difference influence coefficient, It is the preset temperature difference impact index; The local surface tension value and the overall surface tension value are used as the real-time surface tension information.

[0018] Through the above technical scheme, the local temperature difference is determined according to the local temperature rise value and the real-time mixing temperature, and a mathematical formula is designed according to the overall surface tension value and the local temperature difference to quantify the influence of the local temperature difference on the local surface tension, and an accurate local surface tension value is calculated on the basis of the overall surface tension value to reflect the change of the local surface tension under the influence of the local temperature difference, and the local surface tension value and the overall surface tension value are used as real-time surface tension information, so that the real-time surface tension information can fully reflect the surface tension value of the current lithium hexafluorophosphate after mixing with the solvent, and further make the bubble content obtained by subsequent analysis more accurate and comprehensive.

[0019] Optionally, the real-time bubble content is determined according to the real-time viscosity information and the real-time surface tension information, referring to the following formula: ; in, is the real-time bubble content, is the preset correction factor, is the local surface tension value, is the overall surface tension value, is the local viscosity value, is the overall viscosity value, To preset the viscosity change impact index, It is the preset tension change impact index.

[0020] Through the above technical scheme, according to the real-time viscosity information and the real-time surface tension information, a mathematical formula is designed by means of mathematical analysis to quantify the effects of local viscosity changes and local surface tension changes on the real-time bubble content, and the result of the mathematical formula is corrected by a preset correction coefficient to quantify the real-time bubble content, so that the real-time bubble content conforms to the actual mixing conditions of lithium hexafluorophosphate and the solvent, thereby improving the accuracy and comprehensiveness of the real-time bubble content.

[0021] Optionally, the real-time bubble content and the real-time mixing information are analyzed to determine the final bubble content, referring to the following formula: ; in, To preset the mixing time, is the final bubble content after the preset mixing time, is the real-time feeding speed, is the real-time stirring speed, is the real-time bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the preset bubble generation rate influence index, It is the preset bubble dissipation rate influence index.

[0022] Through the above technical solution, on the basis of real-time bubble content and real-time mixing information, mathematical analysis is used to design mathematical formulas to simulate the generation and dissipation process of bubbles in the mixing process of lithium hexafluorophosphate and solvent, and accurately calculate the final bubble content after a preset mixing time, providing quantitative data support for determining whether there is any abnormality in the final bubble content.

[0023] Optionally, analyzing the real-time mixing information and the preset normal bubble content to determine a real-time adjustment scheme includes: Obtain stirring speed control information and determine the stirring speed set; The current mixing time is obtained, and according to the preset normal bubble content, the stirring speed set and the preset mixing time, the matching feeding speed value corresponding to each stirring speed value in the stirring speed set is determined by referring to the following formula: ; in, is the stirring speed set stirring speed value, is the supporting feeding speed value, is the preset normal bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the influence index of the preset stirring speed on the bubble generation rate, is the influence index of the preset stirring speed on the bubble dissipation rate, is the current mixed time, To preset the mixing time; Substitute each stirring speed value and its corresponding matching feeding speed value into the following formula to determine the optimal stirring speed value and the optimal feeding speed value: ; in, are the optimal stirring speed value and the optimal feeding speed value, is the real-time mixing temperature, is the preset adjustment factor, is the stirring speed set stirring speed value, For the current The corresponding supporting feeding speed value, To preset the feeding temperature influence index, To preset the stirring temperature influence index, To preset a safe temperature; The optimal stirring speed value and the optimal feeding speed value are determined as the real-time adjustment scheme.

[0024] Through the above technical scheme, according to the preset normal bubble content, stirring speed set and preset mixing time, a mathematical formula is designed through mathematical analysis to accurately calculate the matching feeding speed value corresponding to each stirring speed value in the stirring speed set, and through the mathematical formula, the optimal stirring speed value and the optimal feeding speed value are extracted as the real-time adjustment scheme, and the current real-time stirring speed and real-time feeding speed are adjusted to the optimal stirring speed value and the optimal feeding speed value, thereby improving the mixing efficiency while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of an application scenario provided for an embodiment of the present application; Figure 2 A flow chart of an automated control system for mixing and feeding liquid raw materials provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0029] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0030] In the existing batch preparation process of lithium hexafluorophosphate liquid salt, the focus is on monitoring the reaction temperature and the feeding rate to ensure the safety of the lithium hexafluorophosphate liquid salt preparation process. However, it is difficult to effectively ensure the quality of the lithium hexafluorophosphate liquid salt during the preparation process, resulting in uneven quality of subsequent 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.

[0031] Based on this, the present application provides an automated control system for mixing and feeding liquid raw materials, which determines real-time viscosity information and real-time surface tension information by analyzing initial information and real-time mixing information of the raw materials, determines real-time bubble content according to the real-time viscosity information and real-time surface tension information, and obtains the final bubble content by analysis based on the real-time bubble content and the real-time mixing information, and determines whether the final bubble content is abnormal by comparing the final bubble content with the preset normal bubble content. If the final bubble content is abnormal, a real-time adjustment plan is determined and executed according to the real-time mixing information and the preset normal bubble content, so as to avoid a large amount of bubbles remaining in the lithium hexafluorophosphate liquid salt obtained by mixing lithium hexafluorophosphate with a solvent, and ensure the quality of the lithium hexafluorophosphate liquid salt during the preparation process of the lithium hexafluorophosphate liquid salt, thereby improving the stability of the lithium ion electrolyte with the lithium hexafluorophosphate liquid salt as the main component.

[0032] Figure 1 A schematic diagram of an application scenario provided in the present application, in the process of mixing lithium hexafluorophosphate and a solvent, the system provided in the present application is applied 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 the solvent to make corresponding adjustments according to the real-time adjustment plan.

[0033] Specifically, the system of the present application is installed in any server, and the server communicates with the mixing device. The server obtains the initial information of the raw materials provided by the staff, and obtains the real-time mixing information provided by the mixing device during the mixing process. The real-time viscosity information and the real-time surface tension information are analyzed, and the real-time bubble content is determined according to the real-time viscosity information and the real-time surface tension information. On the basis of 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 the final bubble content is abnormal. If the final bubble content is abnormal, a real-time adjustment plan is determined and executed according to the real-time mixing information and the preset normal bubble content to avoid a large amount of bubbles remaining in the lithium hexafluorophosphate liquid salt obtained by mixing lithium hexafluorophosphate with the solvent. In the preparation process of the lithium hexafluorophosphate liquid salt, the quality of the lithium hexafluorophosphate liquid salt is guaranteed, thereby improving the stability of the lithium ion electrolyte with the lithium hexafluorophosphate liquid salt as the main component.

[0034] For specific implementation methods, please refer to the following embodiments.

[0035] Figure 2 This is a flow chart of an automatic control system for mixing and feeding liquid raw materials provided in one embodiment of the present application. The system of this embodiment can be applied to the server in the above scenario. Figure 2 As shown, the method includes: S201, obtaining initial raw material information and real-time mixing information, analyzing the initial raw material information and the real-time mixing information, and determining real-time viscosity information and real-time surface tension information.

[0036] The initial information of the raw materials can be considered as a series of initial related information before the lithium hexafluorophosphate is mixed with the solvent, such as the initial temperature of the solvent, the initial viscosity of the solvent, etc. The initial information of the raw materials can be provided by the staff.

[0037] The real-time mixing information can be considered as a series of real-time related information in the process of mixing lithium hexafluorophosphate and solvent, such as real-time mixing temperature, real-time stirring speed, etc. The real-time mixing information can be obtained by a mixing device for mixing lithium hexafluorophosphate and solvent.

[0038] The 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 the solvent.

[0039] The 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 the solvent.

[0040] Specifically, in the process of mixing lithium hexafluorophosphate and a solvent to form a lithium hexafluorophosphate liquid salt, since the lithium hexafluorophosphate needs to be uniformly dissolved in the solvent, the mixture formed by the lithium hexafluorophosphate and the solvent needs to be fully stirred. During the stirring process, a large number of bubbles will be formed in the mixture, and some bubbles will escape from the mixture during the stirring process, while some bubbles will be retained in the mixture, so that a large number of bubbles will exist in the final lithium hexafluorophosphate liquid salt, and then the lithium ion battery electrolyte subsequently prepared from the lithium hexafluorophosphate liquid salt will contain a large number of bubbles, which will increase the internal resistance of the electrolyte, reduce the contact area between the electrolyte and the motor, and cause uneven flow of the electrolyte, which will affect the battery efficiency and reduce the battery life, and even cause safety accidents.

[0041] Therefore, by obtaining the initial information of the raw materials, on the basis of the initial information of the raw materials, combined with the real-time mixing information obtained during the mixing process of lithium hexafluorophosphate and the solvent, a series of mathematical analysis methods are used to obtain the real-time viscosity information and real-time surface tension information of the corresponding mixture during the mixing process of lithium hexafluorophosphate and the solvent, so as to subsequently reflect the bubble content in the mixing process of lithium hexafluorophosphate and the solvent through sequential analysis methods.

[0042] S202: Determine the real-time bubble content according to the real-time viscosity information and the real-time surface tension information.

[0043] The real-time bubble content can be considered as the real-time bubble content during the mixing process of lithium hexafluorophosphate and solvent.

[0044] Specifically, the viscosity of the mixture directly affects the retention of bubbles in the mixture. The lower the viscosity of the mixture, the smaller the resistance of the bubbles in the mixture, and the lower the content of bubbles retained in the mixture. Conversely, the higher the viscosity of the mixture, the higher the content of bubbles retained in the mixture. The surface tension of the mixture directly affects the dissipation rate of the bubbles in the mixture. The greater the surface tension of the mixture, the more difficult it is for the bubbles inside it to rupture and release, which in turn causes the dissipation rate of the bubbles to be slow, resulting in a high bubble content in the mixture. Conversely, the smaller the surface tension of the mixture, the lower the bubble content in the mixture. Based on the viscosity and surface tension, two factors that directly affect the bubble content, the real-time bubble content can be accurately obtained through mathematical analysis.

[0045] S203, analyzing the real-time bubble content and the real-time mixing information to determine the final bubble content.

[0046] The final bubble content can be considered as the bubble content in the lithium hexafluorophosphate liquid salt obtained after the lithium hexafluorophosphate and the solvent are mixed.

[0047] Specifically, after obtaining the real-time bubble content, since the current real-time bubble content cannot represent the bubble content in the lithium hexafluorophosphate liquid salt obtained after the final mixing is completed, in order to accurately obtain the bubble content in the lithium hexafluorophosphate liquid salt finally obtained under the current mixing information, such as the current feeding speed and the current stirring speed, based on the real-time bubble content, according to the real-time mixing information, the final bubble content is predicted by mathematical analysis means, so as to provide necessary data for judging whether the final bubble content meets the use requirements of the lithium hexafluorophosphate liquid salt.

[0048] S204: Compare the final bubble content with the preset normal bubble content to determine whether the final bubble content is abnormal.

[0049] The preset normal bubble content can be considered as the normal amount of bubbles contained in lithium hexafluorophosphate liquid salt without causing negative impact on the electrolyte. The preset normal bubble content can be obtained based on historical data analysis.

[0050] 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 means that the bubble content in the final lithium hexafluorophosphate liquid salt is too high, which will have a negative impact on the electrolyte. At this time, it is judged that the final bubble content is abnormal. Otherwise, the final bubble content is not abnormal.

[0051] S205: If the final bubble content is abnormal, analyze the real-time mixing information and the preset normal bubble content, determine a real-time adjustment plan, and control the mixing device to execute the real-time adjustment plan.

[0052] The mixing device can be considered as a mechanical device for mixing lithium hexafluorophosphate with a solvent.

[0053] The real-time adjustment plan can be considered to include the real-time mixing information required to adjust the final bubble content back to a normal range when the final bubble content is abnormal, such as the adjustment plan of the real-time feeding speed and the real-time stirring speed.

[0054] Specifically, if the final bubble content obtained through analysis is abnormal, the real-time mixing information and the preset normal bubble content are analyzed through 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, and the optimal feeding speed and the optimal stirring speed required to eliminate the abnormal final bubble content are obtained to determine the real-time adjustment plan, and control the mixing equipment to make corresponding adjustments based on the parameters in the real-time adjustment plan.

[0055] By the method provided in this embodiment, the initial information of the raw materials and the real-time mixing information are analyzed to determine the real-time viscosity information and the 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. On the basis of 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 the final bubble content is abnormal. 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 amount of bubbles remaining in the lithium hexafluorophosphate liquid salt obtained by mixing lithium hexafluorophosphate with the solvent. In the preparation process of the lithium hexafluorophosphate liquid salt, the quality of the lithium hexafluorophosphate liquid salt is guaranteed, thereby improving the stability of the lithium ion electrolyte with the lithium hexafluorophosphate liquid salt as the main component.

[0056] In some embodiments, based on the initial viscosity of the solvent and the initial temperature of the solvent, the overall viscosity value is determined according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed; based on the real-time feeding speed, the local temperature rise value is determined according to the real-time mixing temperature; based on the overall viscosity value and the local temperature rise value, the real-time viscosity information is determined; based on the initial surface tension of the solvent and the initial temperature of the solvent, the overall surface tension value is determined according to the real-time mixing temperature and the 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.

[0057] The initial information of raw materials includes the initial viscosity of the solvent, the initial surface tension of the solvent and the initial temperature of the solvent.

[0058] The real-time mixing information includes the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed.

[0059] The initial viscosity of the solvent can be considered as the initial viscosity value before the solvent is mixed with lithium hexafluorophosphate.

[0060] The initial temperature of the solvent can be considered as the initial temperature value before the solvent and lithium hexafluorophosphate are mixed.

[0061] 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.

[0062] The real-time feeding rate can be considered as the rate at which solid lithium hexafluorophosphate is added to the solvent during the mixing process of the solvent and lithium hexafluorophosphate.

[0063] The real-time stirring speed can be considered as the speed at which the mixture of the solvent and lithium hexafluorophosphate is stirred during the mixing process of the solvent and lithium hexafluorophosphate.

[0064] 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 of the solvent and lithium hexafluorophosphate.

[0065] The local temperature rise value 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.

[0066] The overall surface tension value can be considered as the overall surface tension value of the mixture formed by the solvent and lithium hexafluorophosphate.

[0067] Specifically, the above-mentioned embodiment explains the direct influence of the two factors of viscosity and surface tension on the bubble content. Furthermore, since the viscosity and surface tension values ​​of the mixture formed by the solvent and lithium hexafluorophosphate are dynamically changing, and the dynamic change is mainly affected by the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed, at the same time, since the solvation energy, that is, the energy released by the ion-solvent interaction formed by the lithium hexafluorophosphate and the solvent molecules after the lithium hexafluorophosphate is dissolved, is greater than the energy required to destroy the lithium hexafluorophosphate lattice, the mixing process of lithium hexafluorophosphate and the solvent is exothermic, which makes the real temperature representing the overall mixture temperature The mixing temperature cannot fully and accurately reflect the changes in the viscosity and surface tension of the mixture. It is necessary to consider the local temperature rise phenomenon in the overall mixing process. The local temperature rise phenomenon mainly occurs in the feeding process. The initial stage of contact between high-purity lithium hexafluorophosphate and the solvent will produce obvious local temperature rise phenomenon. The local temperature rise phenomenon brings about 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 value and overall surface tension value of the mixture, it is also necessary to focus on the changes in local viscosity and surface tension caused by the local temperature rise phenomenon.

[0068] In summary, on the basis of the initial viscosity of the solvent and the initial temperature of the solvent, the overall viscosity value of the mixture formed by the current mixture of lithium hexafluorophosphate and the solvent is obtained by mathematically analyzing the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed as variables, and then the local temperature rise value is determined according to the real-time feeding speed and the real-time mixing temperature. On the basis of the overall viscosity value and the local temperature rise value, the real-time viscosity information including the overall viscosity value and the local viscosity change value is analyzed and obtained. At the same time, on the basis of the initial surface tension of the solvent and the initial temperature of the solvent, the overall surface tension value is obtained by mathematically analyzing the real-time mixing temperature and the real-time stirring speed as variables, and based on the local temperature rise value, according to the overall surface tension value, the real-time surface tension information including the overall surface tension value and the local surface tension change value is determined.

[0069] Through the method provided in this embodiment, on the basis of the initial viscosity and initial temperature of the solvent, according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed, the overall viscosity value is obtained. At the same time, considering that there is a local temperature rise phenomenon in the mixing process of lithium hexafluorophosphate and the solvent, and the local temperature rise phenomenon will cause changes in local viscosity and surface tension, according to the overall viscosity value and the local temperature rise value, the real-time viscosity information that can fully reflect the viscosity of the mixture formed by the current mixing of lithium hexafluorophosphate and the solvent is obtained. Further, on the basis of the initial surface tension and initial temperature of the solvent, according to the real-time mixing temperature and the real-time stirring speed, the overall surface tension value is obtained, and then according to the overall surface tension value and the local temperature rise value, the real-time surface tension information that can fully reflect 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 influence of the local temperature rise phenomenon on viscosity and surface tension, the real-time viscosity information and real-time surface tension information that can fully reflect the changes in viscosity and surface tension are obtained, so that the bubble content subsequently obtained based on the real-time viscosity information and the real-time surface tension information is more accurate.

[0070] In some embodiments, the real-time material concentration is determined according to the real-time feeding speed; the real-time shear rate is determined according to the real-time stirring speed; based on the initial viscosity of the solvent and the initial temperature of the solvent, according to the real-time mixing temperature, the real-time material concentration and the real-time shear rate, refer to formula (1) to determine the overall viscosity value: (1) in, is the overall viscosity value, is the initial viscosity of the solvent, is the initial temperature of the solvent, is the real-time mixing temperature, is the preset activation energy, is the preset gas constant, is the preset concentration influence coefficient, is the real-time material concentration, is the preset shear rate influence coefficient, is the shear rate, is the preset flow behavior index.

[0071] The real-time material concentration can be considered as the concentration of lithium hexafluorophosphate in the current mixture of lithium hexafluorophosphate and solvent.

[0072] The real-time shear rate can be considered as the degree of shear deformation occurring inside the mixture during the stirring of the mixture of lithium hexafluorophosphate and the solvent.

[0073] The preset activation energy can be considered as the energy barrier that needs to be overcome to form lithium hexafluorophosphate liquid salt after the mixture of lithium hexafluorophosphate and the solvent. The preset activation energy can be obtained by analyzing the experimental data of the mixture of lithium hexafluorophosphate and the solvent.

[0074] The preset gas constant may be considered as a physical constant describing the properties of a gas, and the preset gas constant may adopt a universal gas constant.

[0075] The preset concentration influence coefficient can be considered as a coefficient used to express the degree of influence of the concentration of lithium hexafluorophosphate on the viscosity of the mixture. The preset concentration influence coefficient can be obtained by analyzing historical data.

[0076] The preset shear rate influence coefficient can be considered as a coefficient used to express the influence degree of the real-time shear rate on the viscosity of the mixture. The preset shear rate influence coefficient can be obtained by analyzing historical data.

[0077] The preset flow behavior index can be considered as an index of influence of the flow behavior of the mixture during stirring on the viscosity of the mixture under the influence of the real-time shear rate. The preset flow behavior index is obtained by analyzing the experimental data of the mixing of lithium hexafluorophosphate and the solvent.

[0078] Specifically, the real-time feeding speed 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 speed. At the same time, the increase in stirring speed will lead to an increase in the flow intensity inside the mixture, thereby affecting the shear rate. According to the linear relationship between stirring speed and shear rate, historical data can be analyzed to obtain the corresponding shear rate under different stirring speeds, and then the real-time shear rate can be determined according to the real-time stirring speed.

[0079] Furthermore, through formula (1) Describe the change in overall viscosity of the mixture of lithium hexafluorophosphate and solvent with respect to temperature based on the initial solvent viscosity, by The effect of lithium hexafluorophosphate concentration on the overall viscosity is described by Describe the effect of shear rate and flow behavior on the overall viscosity. Formula (1) is used to comprehensively quantify the effects of temperature, material concentration, shear rate and flow behavior on the overall viscosity, thereby obtaining a comprehensive and accurate overall viscosity value.

[0080] Through the method provided in this embodiment, the real-time material concentration and the real-time shear rate are determined respectively according to the real-time feeding speed and the real-time stirring speed. On the basis of the initial viscosity of the solvent and the initial temperature of the solvent, a mathematical formula is designed according to the real-time mixing temperature, the real-time material concentration and the real-time shear rate to comprehensively quantify the effects of temperature, material concentration, shear rate and flow behavior on the overall viscosity, thereby obtaining a comprehensive and accurate overall viscosity value.

[0081] In some embodiments, the mass of material fed per unit time is determined according to the real-time feeding speed; the local density and the local specific heat capacity are determined according to the mass of material fed per unit time and the real-time material concentration; based on the real-time mixing temperature, the local temperature rise value is determined according to the mass of material fed per unit time, the local density and the local specific heat capacity, with reference to formula (2): (2) in, is the local temperature rise value, is the real-time mixing temperature, is the preset reaction enthalpy, is the local density, is the local specific heat capacity, is the feeding mass per unit time, is the preset molar amount, It is the real-time material concentration.

[0082] The feeding mass per unit time can be considered as the mass of lithium hexafluorophosphate added to the solvent per unit time, and the feeding mass per unit time can be obtained by the preset parameters of the mixing equipment.

[0083] The local density can be considered as the initial stage of contact between lithium hexafluorophosphate and the solvent. When lithium hexafluorophosphate is not evenly mixed with the solvent, the corresponding local density value can be obtained based on the density value corresponding to the current unit time feed mass and real-time material concentration in the historical data.

[0084] The local specific heat capacity can be considered as the initial stage of contact between lithium hexafluorophosphate and the solvent. When lithium hexafluorophosphate is not evenly mixed with the solvent, the corresponding local specific heat capacity value can be obtained based on the specific heat capacity value corresponding to the current unit time feed mass and real-time material concentration in the historical data.

[0085] The preset reaction enthalpy can be considered as a physical quantity describing the heat release during the initial mixing process of lithium hexafluorophosphate and the solvent. The preset reaction enthalpy can be obtained by measuring the mixing experiment of lithium hexafluorophosphate and the solvent.

[0086] 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 according to the product of the standard molar amount of lithium hexafluorophosphate and the mass of the material added per unit time.

[0087] Specifically, through formula (1) It reflects the energy released by the lithium hexafluorophosphate in the initial stage of contact with the solvent per unit time. Reflects the total energy required to increase the unit temperature of lithium hexafluorophosphate input per unit time, through Based on the description of the real-time mixing temperature, the temperature change caused by the input of lithium hexafluorophosphate per unit time is accumulated to obtain the accurate local temperature rise value.

[0088] Through the method provided in this embodiment, the feeding mass per unit time is determined according to the real-time feeding speed, and the local density and local specific heat capacity are determined according to the feeding mass per unit time and the real-time material concentration. On the basis of the real-time mixing temperature, according to the feeding mass per unit time, the local density and the local specific heat capacity, the temperature change caused by the lithium hexafluorophosphate fed per unit time is quantified through a mathematical formula, and an accurate local temperature rise value is obtained, which provides an important data basis for the subsequent analysis of the influence of local temperature changes on local viscosity and surface tension.

[0089] In some embodiments, based on the overall viscosity value, according to the local temperature rise value, the local viscosity value is determined by referring to the following formula (3): (3) in, is the local viscosity value, is the local temperature rise value, is the overall viscosity value, is the preset activation energy, is the preset gas constant, is the real-time mixing temperature; the local viscosity value and the overall viscosity value are used as the real-time viscosity information.

[0090] The local viscosity value can be considered as the local viscosity value affected by the local temperature rise.

[0091] Specifically, through formula (3) Reflects the influence of temperature change on the local viscosity value and 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 the overall viscosity value, so as to obtain an accurate local viscosity value, and use the local viscosity value and the overall viscosity value as real-time viscosity information.

[0092] Through the method provided in this embodiment, based on the overall viscosity value and according to the local temperature rise value, a mathematical formula is designed through mathematical analysis to quantify the local viscosity change caused by the local temperature change, thereby obtaining an accurate local viscosity value, and using the local viscosity value and the overall viscosity value as real-time viscosity information, so that the real-time viscosity information can fully reflect the current viscosity value of lithium hexafluorophosphate after mixing with the solvent, thereby making the bubble content obtained by subsequent analysis more accurate and comprehensive.

[0093] In some embodiments, based on the initial surface tension of the solvent and the initial temperature of the solvent, the overall surface tension value is determined according to the real-time mixing temperature and the real-time stirring speed, referring to formula (4): (4) in, is the overall surface tension value, is the initial surface tension of the solvent, is the preset temperature influence coefficient, is the real-time mixing temperature, is the initial temperature of the solvent, is the real-time stirring speed, is the influence coefficient of preset stirring speed, It is the influence index of preset stirring speed.

[0094] 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 a mixing experiment of lithium hexafluorophosphate and the solvent.

[0095] The preset stirring speed influence coefficient can be considered as a coefficient value used to express the linear influence of the real-time stirring speed on the overall surface tension value. The preset stirring speed influence coefficient can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0096] The preset stirring speed influence index can be considered as an index value used to express the nonlinear influence of the real-time stirring speed on the overall surface tension value. The preset stirring speed influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0097] Specifically, through formula (4) Reflects the effect of temperature rise on the overall surface tension value under the initial surface tension of the solvent, and It reflects the influence of real-time stirring speed on the overall surface tension value, and obtains the overall surface tension value comprehensively and accurately.

[0098] Through the method provided in this embodiment, on the basis of the initial surface tension of the solvent and the initial temperature of the solvent, according to the real-time mixing temperature and the real-time stirring speed, through a mathematical formula, the difference between the real-time mixing temperature and the initial temperature of the solvent and the influence of the real-time stirring speed on the overall surface tension are comprehensively considered, and an accurate overall surface tension value is quantified, so that the overall surface tension value is more accurate, and thus the overall surface tension value is consistent with the actual mixing condition of the current lithium hexafluorophosphate and the solvent.

[0099] In some embodiments, the local temperature difference is determined according to the local temperature rise value and the real-time mixing temperature; the local surface tension value is determined according to the overall surface tension value and the local temperature difference value, referring to formula (5): (5) in, is the local surface tension value, is the overall surface tension value, is the local temperature difference, is the preset temperature difference influence coefficient, It is a preset temperature difference influence index; the local surface tension value and the overall surface tension value are used as real-time surface tension information.

[0100] The local temperature difference can be considered as the temperature difference between the local temperature rise value and the real-time mixing temperature.

[0101] The preset temperature difference influence coefficient can be considered as a coefficient value used to express the linear influence of the local temperature difference on the surface tension value. The preset temperature difference influence coefficient can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0102] The preset temperature difference influence index can be considered as an exponential value used to express the nonlinear influence of the local temperature difference on the surface tension value. The preset temperature difference influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0103] Specifically, on the basis of the overall surface tension value, the influence of the local temperature difference on the local surface tension is introduced, and then the local surface tension value under the influence of the local temperature difference is obtained by mathematical analysis through formula (5), and the local surface tension value and the overall surface tension value are used as real-time surface tension information.

[0104] Through the method provided in this embodiment, the local temperature difference is determined according to the local temperature rise value and the real-time mixing temperature, and a mathematical formula is designed according to the overall surface tension value and the local temperature difference to quantify the influence of the local temperature difference on the local surface tension, and on the basis of the overall surface tension value, an accurate local surface tension value is calculated to reflect the change of the local surface tension under the influence of the local temperature difference, and the local surface tension value and the overall surface tension value are used as real-time surface tension information, so that the real-time surface tension information can fully reflect the surface tension value of the current lithium hexafluorophosphate after mixing with the solvent, and further make the bubble content obtained by subsequent analysis more accurate and comprehensive.

[0105] In some embodiments, the real-time bubble content is determined based on the real-time viscosity information and the real-time surface tension information, referring to formula (6): (6) in, is the real-time bubble content, is the preset correction factor, is the local surface tension value, is the overall surface tension value, is the local viscosity value, is the overall viscosity value, To preset the viscosity change impact index, It is the preset tension change impact index.

[0106] The preset correction coefficient can be considered as a coefficient used to correct the proportional relationship in formula (6) to ensure that the result of formula (6) can accurately reflect the actual bubble content. The preset correction coefficient can be obtained based on the mixing experiment of lithium hexafluorophosphate and solvent or historical data.

[0107] The preset viscosity change influence index can be considered as an influence index of local viscosity change on real-time bubble content, and the preset viscosity change influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0108] The preset tension change influence index can be considered as an influence index of the local surface tension change on the real-time bubble content, and the preset tension change influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0109] Specifically, through formula (6) Reflects the change of local viscosity value relative to the overall viscosity value, and at the same time It reflects the change of the local surface tension value relative to the overall surface tension value, and reflects the influence of the local viscosity change and the local surface tension change on the real-time bubble content by introducing the preset viscosity change influence index and the preset tension change influence index. Finally, the result of formula (6) is corrected by the preset correction coefficient to quantify the accurate real-time bubble content.

[0110] Through the method provided in this embodiment, based on the real-time viscosity information and the real-time surface tension information, a mathematical formula is designed through mathematical analysis to quantify the effects of local viscosity changes and local surface tension changes on the real-time bubble content, respectively, and the result of the mathematical formula is corrected by a preset correction coefficient to quantify the real-time bubble content, so that the real-time bubble content conforms to the actual mixing conditions of the current lithium hexafluorophosphate and the solvent, thereby improving the accuracy and comprehensiveness of the real-time bubble content.

[0111] In some embodiments, the real-time bubble content and the real-time mixing information are analyzed to determine the final bubble content, referring to formula (7): (7) in, To preset the mixing time, is the final bubble content after the preset mixing time. is the real-time feeding speed, is the real-time stirring speed, is the real-time bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the preset bubble generation rate influence index, It is the preset bubble dissipation rate influence index.

[0112] The preset mixing time can be considered as the mixing time required for mixing the preset lithium hexafluorophosphate and the solvent to obtain the lithium hexafluorophosphate liquid salt, and the preset mixing time can be set by the staff.

[0113] The preset bubble generation rate constant can be considered as a parameter that affects the bubble generation rate by the current real-time feeding speed and stirring speed. The preset bubble generation rate constant can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0114] The preset bubble dissipation rate constant can be considered as an influencing parameter of the current real-time stirring speed on the bubble dissipation speed. The preset bubble dissipation rate constant can be obtained through a mixing experiment of lithium hexafluorophosphate and a solvent.

[0115] The preset bubble generation rate influence index can be considered as the influence index of the real-time stirring speed on the bubble generation rate in the mixture formed by lithium hexafluorophosphate and the solvent, the preset bubble generation rate influence index.

[0116] 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 the solvent.

[0117] Specifically, in the mixing process of lithium hexafluorophosphate and solvent, the change of bubble content can usually be regarded as a simultaneous generation and dissipation process, which can be expressed by Reflected in the current real-time feeding speed and stirring speed, the steady-state bubble content after considering the corresponding bubble generation rate and bubble dissipation rate is obtained by Reflects the difference between the real-time bubble content and the steady-state bubble content, and then uses an exponential decay factor It means 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 becomes stable. In summary, the final bubble content after the preset mixing time is obtained by formula (7).

[0118] Through the method provided in this embodiment, on the basis of real-time bubble content and real-time mixing information, mathematical analysis is used to design a mathematical formula to simulate the generation and dissipation process of bubbles in the mixing process of lithium hexafluorophosphate and solvent, and the final bubble content after a preset mixing time is accurately calculated, thereby providing quantitative data support for determining whether there is an abnormality in the final bubble content.

[0119] In some embodiments, the stirring speed adjustment information is obtained to determine the stirring speed set; the current mixing time is obtained, and according to the preset normal bubble content, the stirring speed set and the preset mixing time, the matching feeding speed value corresponding to each stirring speed value in the stirring speed set is determined with reference to formula (8): (8) in, is the stirring speed set stirring speed value, For the matching feeding speed value, To preset the normal bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the influence index of the preset stirring speed on the bubble generation rate, is the influence index of the preset stirring speed on the bubble dissipation rate, is the current mixed time, To preset the mixing time; 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: (9) in, is the optimal stirring speed value and the optimal feeding speed value, is the real-time mixing temperature, is the preset adjustment factor, is the stirring speed set stirring speed value, For the current The corresponding supporting feeding speed value, To preset the feeding temperature influence index, To preset the stirring temperature influence index, To preset a safe temperature; to determine the optimal stirring speed value and the optimal feeding speed value as a real-time adjustment plan.

[0120] The stirring speed regulation information can be considered as the stirring speed range information corresponding to the stirring equipment currently used to mix lithium hexafluorophosphate and the solvent, and the stirring speed regulation information can be provided by the staff.

[0121] The stirring speed set can be considered as a set of several stirring speed values ​​obtained by dividing the stirring speed regulation information.

[0122] The current mixing time can be regarded as the mixing time of the lithium hexafluorophosphate and the solvent.

[0123] The matching feeding speed value can be considered as the feeding speed value corresponding to each stirring speed value in the stirring speed set under the premise of ensuring normal bubble content.

[0124] The optimal stirring speed value can be considered as the optimal stirring speed under the premise of ensuring normal bubble content and mixing efficiency.

[0125] The optimal feeding speed value can be considered as the optimal feeding speed under the premise of ensuring normal bubble content and mixing efficiency.

[0126] The preset adjustment coefficient can be considered as the influence coefficient of the feeding rate and the stirring rate on the temperature of the mixture of lithium hexafluorophosphate and the solvent. The preset adjustment coefficient can be obtained through a mixing experiment of lithium hexafluorophosphate and the solvent.

[0127] 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 the solvent. The preset feeding temperature influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and the solvent.

[0128] The preset stirring temperature influence index can be considered as the influence index of the stirring speed on the temperature of the mixture of lithium hexafluorophosphate and the solvent. The preset stirring temperature influence index can be obtained through a mixing experiment of lithium hexafluorophosphate and the solvent.

[0129] The preset safety temperature can be considered as the maximum temperature value that can be reached while ensuring safety during the mixing process of lithium hexafluorophosphate and the solvent. The preset safety temperature can be obtained by analyzing historical data.

[0130] Specifically, through formula (8) Under the preset normal bubble content, the basic coefficient is calculated according to the bubble generation and dissipation rate constants, and then At the current stirring speed value, the balance point between bubble generation and dissipation is obtained by It reflects the ratio between the current mixing time and the preset mixing time as a time influencing factor, reflecting the influence of different mixing times on the matching feeding speed corresponding to the current stirring speed. In summary, according to each stirring speed value, the corresponding matching feeding speed is calculated to ensure that the bubble content is within the normal range when the preset mixing time is reached.

[0131] Furthermore, after obtaining a number of stirring speed values ​​and the corresponding matching feeding speeds, it is necessary to determine the optimal stirring speed and the optimal feeding speed as the basis for adjustment. By formula (9), the temperature value after the stirring speed value and the corresponding matching feeding speed affect the temperature of the mixture of lithium hexafluorophosphate and the solvent is conditionally limited, and it is limited that it cannot be greater than the preset safety temperature. Under the above constraints, the maximum stirring speed value and the corresponding matching feeding speed value are extracted, and the maximum stirring speed value and the corresponding matching feeding speed value are respectively used as the optimal stirring speed and the optimal feeding speed, and the optimal stirring speed value and the optimal feeding speed value are determined as the real-time adjustment plan. According to the real-time adjustment plan, the current real-time stirring speed and the real-time feeding speed are adjusted to the optimal stirring speed value and the optimal feeding speed value, while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate, the mixing efficiency is improved.

[0132] Through the method provided in this embodiment, according to the preset normal bubble content, the stirring speed set and the preset mixing time, a mathematical formula is designed through mathematical analysis means, and the matching feeding speed value corresponding to each stirring speed value in the stirring speed set is accurately calculated, and through the mathematical formula, the optimal stirring speed value and the optimal feeding speed value are extracted as the real-time adjustment scheme, and the current real-time stirring speed and real-time feeding speed are adjusted to the optimal stirring speed value and the optimal feeding speed value, while ensuring the safety of the mixing process and the quality of lithium hexafluorophosphate, the mixing efficiency is improved.

Claims

1. An automatic control system for mixing and feeding liquid raw materials, characterized in that: include: Acquiring initial raw material information and real-time mixing information, analyzing the initial raw material information and the real-time mixing information, and determining real-time viscosity information and real-time surface tension information; Determining real-time bubble content according to the real-time viscosity information and the real-time surface tension information; Analyzing the real-time bubble content and the real-time mixing information to determine a final bubble content; Comparing the final bubble content with a preset normal bubble content to determine whether the final bubble content is abnormal; If the final bubble content is abnormal, the real-time mixing information and the preset normal bubble content are analyzed to determine a real-time adjustment plan, and the mixing device is controlled to execute the real-time adjustment plan.

2. The system according to claim 1, characterized in that The initial raw material information includes the initial viscosity of the solvent, the initial surface tension of the solvent and the initial temperature of the solvent, the real-time mixing information includes the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed, and the analyzing the initial raw material information 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 solvent viscosity and the initial solvent temperature, the overall viscosity value is determined according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed; Based on the real-time feeding speed and the real-time mixing temperature, determining a local temperature rise value; Determining real-time viscosity information according to the overall viscosity value and the local temperature rise value; Based on the initial surface tension of the solvent and the initial temperature of the solvent, determining the overall surface tension value according to the real-time mixing temperature and the real-time stirring speed; Based on the local temperature rise value, 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 method of determining the overall viscosity value based on the initial solvent viscosity and the initial solvent temperature according to the real-time mixing temperature, the real-time feeding speed and the real-time stirring speed comprises: Determining the real-time material concentration according to the real-time feeding speed; Determining a real-time shear rate according to the real-time stirring speed; Based on the initial solvent viscosity and the initial solvent temperature, according to the real-time mixing temperature, the real-time material concentration and the real-time shear rate, the overall viscosity value is determined with reference to the following formula: ; in, is the overall viscosity value, is the initial viscosity of the solvent, is the initial temperature of the solvent, is the real-time mixing temperature, is the preset activation energy, is the preset gas constant, is the preset concentration influence coefficient, is the real-time material concentration, is the preset shear rate influence coefficient, is the shear rate, is the preset flow behavior index.

4. The system according to claim 3, characterized in that The determining of the local temperature rise value based on the real-time feeding speed and the real-time mixing temperature includes: Determine the feeding mass per unit time according to the real-time feeding speed; Determine the local density and the local specific heat capacity according to the feeding mass per unit time and the real-time material concentration; Based on the real-time mixing temperature, according to the feeding mass per unit time, the local density and the local specific heat capacity, the local temperature rise value is determined with reference to the following formula: ； in, is the local temperature rise value, is the real-time mixing temperature, is the preset reaction enthalpy, is the local density, is the local specific heat capacity, is the feeding mass per unit time, is the preset molar amount, is the real-time material concentration.

5. The system according to claim 4, characterized in that Determining the real-time viscosity information according to the overall viscosity value and the local temperature rise value includes: Based on the overall viscosity value, according to the local temperature rise value, refer to the following formula to determine the local viscosity value: ； in, is the local viscosity value, is the local temperature rise value, is the overall viscosity value, is the preset activation energy, is the preset gas constant, is 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 Based on the initial surface tension of the solvent and the initial temperature of the solvent, the overall surface tension value is determined according to the real-time mixing temperature and the real-time stirring speed, referring to the following formula: ； in, is the overall surface tension value, is the initial surface tension of the solvent, is the preset temperature influence coefficient, is the real-time mixing temperature, is the initial temperature of the solvent, is the real-time stirring speed, is the influence coefficient of preset stirring speed, It is the influence index of preset stirring speed.

7. The system according to claim 6, characterized in that The determining of real-time surface tension information based on the local temperature rise value and the overall surface tension value includes: Determining a local temperature difference according to the local temperature rise value and the real-time mixed temperature; According to the overall surface tension value and the local temperature difference value, the local surface tension value is determined by referring to the following formula: ； in, is the local surface tension value, is the overall surface tension value, is the local temperature difference, is the preset temperature difference influence coefficient, It is the preset temperature difference impact 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 according to the real-time viscosity information and the real-time surface tension information, referring to the following formula: ； in, is the real-time bubble content, is the preset correction factor, is the local surface tension value, is the overall surface tension value, is the local viscosity value, is the overall viscosity value, To preset the viscosity change impact index, It is the preset tension change impact index.

9. The system according to claim 5, characterized in that The real-time bubble content and the real-time mixing information are analyzed to determine the final bubble content, referring to the following formula: ; in, To preset the mixing time, is the final bubble content after the preset mixing time, is the real-time feeding speed, is the real-time stirring speed, is the real-time bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the preset bubble generation rate influence index, It is the preset bubble dissipation rate influence index.

10. The system according to claim 9, characterized in that The analyzing 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 stirring speed set; The current mixing time is obtained, and according to the preset normal bubble content, the stirring speed set and the preset mixing time, the matching feeding speed value corresponding to each stirring speed value in the stirring speed set is determined by referring to the following formula: ； in, is the stirring speed set stirring speed value, is the supporting feeding speed value, is the preset normal bubble content, is the preset bubble generation rate constant, is the preset bubble dissipation rate constant, is the influence index of the preset stirring speed on the bubble generation rate, is the influence index of the preset stirring speed on the bubble dissipation rate, is the current mixed time, To preset the mixing time; Substitute each stirring speed value and its corresponding matching feeding speed value into the following formula to determine the optimal stirring speed value and the optimal feeding speed value: ； in, are the optimal stirring speed value and the optimal feeding speed value, is the real-time mixing temperature, is the preset adjustment factor, is the stirring speed set The stirring speed value, For the current The corresponding supporting feeding speed value, To preset the feeding temperature influence index, To preset the stirring temperature influence index, To preset a 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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