All-solid-state battery activity preparation performance evaluation method

Abstract

The invention discloses an all-solid-state battery activity preparation performance evaluation method, and belongs to the technical field of batteries. The method comprises the following steps: acquiring battery environment data, electrolyte state data and lithium ion state data; performing comprehensive analysis according to the battery environment data to obtain a battery environment adaptability evaluation value, and performing matching according to the battery environment adaptability evaluation value to obtain a lithium ion performance index threshold value; and performing comprehensive analysis according to the lithium ion state data to obtain a lithium ion state evaluation value, performing comprehensive analysis according to the electrolyte state data to obtain an electrolyte influence index, performing comprehensive analysis to obtain a lithium ion performance index, and performing evaluation feedback according to the lithium ion performance index and a lithium ion performance index threshold. According to the method, the problem that the applicability of the evaluation method is affected due to the fact that the evaluation method is limited by external interference in practical application in the prior art is solved, and the universality and the accuracy of the evaluation method are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method for evaluating the active preparation performance of an all-solid-state battery. Background Art

[0002] With the continuous progress of science and technology and the rapid development of the new energy industry, all-solid-state batteries will become an important development direction of future battery technology. In the active preparation process of all-solid-state batteries, lithium ion transmission performance is a crucial consideration. The lithium ion transmission speed determines the speed of battery charging and discharging, and is one of the important indicators for evaluating battery performance.

[0003] The existing lithium ion transport performance evaluation system for the active preparation process of all-solid-state batteries is mainly implemented through electrochemical impedance spectroscopy testing, two-dimensional solid-state nuclear magnetic resonance technology, and rapid evaluation methods. Among them, electrochemical impedance spectroscopy testing is a traditional and commonly used method, two-dimensional solid-state nuclear magnetic resonance technology can achieve the measurement of interface structure, and rapid evaluation methods are of great significance for simultaneously achieving high energy density and safe, stable and long-life performance of solid-state batteries.

[0004] For example, the invention patent with announcement number: CN118425805B announces a method for quickly evaluating the lithium ion transmission capacity of a composite positive electrode of a solid-state battery, comprising: assembling an electronic blocking and negative electrode symmetrical battery using a button battery as a carrier; using a battery testing system to perform constant voltage charging on the symmetrical battery and read the steady-state current value; calculating the ionic impedance of the two symmetrical batteries; the impedance difference between the two symmetrical batteries is the ionic impedance of the composite positive electrode; based on the ionic impedance, thickness and cross-sectional area of ​​the composite positive electrode, and the ionic conductivity and volume fraction of the solid electrolyte, the ionic conductivity and tortuosity of the composite positive electrode are calculated, thereby simply and quickly evaluating the lithium ion transmission performance of the composite positive electrode.

[0005] For example, a patent application with publication number: CN114371411A discloses a method for quickly evaluating the cycle performance of a lithium-ion power battery, comprising: first activating the battery to be tested at room temperature with a small current of 0.1-0.2C for 2-3 weeks, and then performing cycle aging. The cycle conditions are: temperature of 30-45°C, 0-100% SOC, constant current charge and discharge, charge and discharge current of 0.8C-2.0C, and charge and discharge interval of 15-30 minutes, so that the battery reaches an electrochemically stable state. Symmetrical pulse charge and discharge are applied synchronously during the above cycle to measure the pseudo cycle life of the lithium-ion battery.

[0006] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the prior art, the evaluation method may only be applicable to sample testing under laboratory conditions, but in actual application it may be limited by external interference, resulting in the problem that the applicability of the evaluation method is affected. Summary of the invention

[0008] The present invention provides a method for evaluating the active preparation performance of an all-solid-state battery, thereby solving the problem that the evaluation method in the prior art may only be applicable to sample testing under laboratory conditions, but may be limited by external interference in actual applications, resulting in the applicability of the evaluation method being affected, thereby achieving improved universality and accuracy of the evaluation method.

[0009] The present invention provides a method for evaluating the performance of active preparation of an all-solid-state battery, comprising the following steps: acquiring battery environment data, electrolyte state data and lithium ion state data; obtaining a battery environment adaptability evaluation value by comprehensive analysis based on the battery environment data, and obtaining a lithium ion performance index threshold value by matching the battery environment adaptability evaluation value; obtaining a lithium ion state evaluation value by comprehensive analysis based on the lithium ion state data, obtaining an electrolyte influence index by comprehensive analysis based on the electrolyte state data, obtaining a lithium ion performance index by comprehensive analysis, and performing evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold value.

[0010] Furthermore, the step of obtaining a battery environmental adaptability evaluation value based on a comprehensive analysis of the battery environmental data includes: the battery environmental data includes an ambient temperature, an ambient pressure value, and an ambient humidity; obtaining a reference ambient temperature, an allowable deviation ambient temperature, a critical ambient pressure value, a reference ambient humidity, and an allowable deviation ambient humidity from a lithium ion evaluation database; and obtaining a battery environmental adaptability evaluation value through a comprehensive analysis.

[0011] Furthermore, the step of obtaining a lithium ion performance index threshold value according to the battery environmental adaptability evaluation value matching includes: matching the battery environmental adaptability evaluation value with the lithium ion performance index threshold values ​​corresponding to each battery environmental adaptability evaluation value interval preset in a lithium ion evaluation database to obtain the lithium ion performance index threshold value corresponding to the battery environmental adaptability evaluation value interval.

[0012] Furthermore, the step of obtaining a lithium ion state evaluation value based on a comprehensive analysis of the lithium ion state data includes: the lithium ion state data includes lithium ion conductivity, lithium ion activation energy and lithium ion migration number; obtaining critical lithium ion conductivity, critical lithium ion activation energy and critical lithium ion migration number from a lithium ion evaluation database; and obtaining a lithium ion state evaluation value through comprehensive analysis.

[0013] Furthermore, the step of obtaining an electrolyte influence index through comprehensive analysis based on electrolyte status data includes: the electrolyte status data includes interface contact resistance, stacking pressure and electrolyte membrane thickness; obtaining critical interface contact resistance, reference stacking pressure, allowable deviation stacking pressure, reference electrolyte membrane thickness and allowable deviation electrolyte membrane thickness from a lithium ion evaluation database; and obtaining an electrolyte influence index through comprehensive analysis.

[0014] Furthermore, the step of comprehensively analyzing and obtaining the lithium ion performance index includes: collecting and analyzing the compatibility data of the electrolyte and lithium ions to obtain the lithium ion performance influence index; obtaining the critical lithium ion state evaluation value and the critical electrolyte influence index from the lithium ion evaluation database; and comprehensively analyzing and obtaining the lithium ion performance index.

[0015] Furthermore, collecting and analyzing the compatibility data of the electrolyte and lithium ions to obtain the lithium ion performance influence index comprises the steps of: obtaining a compatibility relationship diagram according to the change in the relationship between the compatibility data of the electrolyte and lithium ions and the lithium ion performance influence index; and obtaining the lithium ion performance influence index according to processing the compatibility relationship diagram.

[0016] Furthermore, the lithium ion performance index is obtained as follows:

[0017]

[0018] Wherein, ξP represents the lithium ion performance index, α1 represents the lithium ion performance influence factor corresponding to the lithium ion state evaluation value, α2 represents the lithium ion performance influence factor corresponding to the electrolyte influence index, ξS1 represents the lithium ion state evaluation value, ξS0 represents the critical lithium ion state evaluation value, ξE1 represents the electrolyte influence index, ξE0 represents the critical electrolyte influence index, ξP0 represents the lithium ion performance influence index, and e is a natural constant.

[0019] Furthermore, the step of providing evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold includes: comparing the lithium ion performance index with the lithium ion performance index threshold; if the lithium ion performance index is greater than or equal to the lithium ion performance index threshold, it means that the lithium ion transmission performance is qualified and no additional operation is performed; if the lithium ion performance index is less than the lithium ion performance index threshold, it means that the lithium ion transmission performance is unqualified; the difference between the lithium ion performance index threshold and the lithium ion performance index is marked as the lithium ion performance index difference; and adjustment feedback is performed based on the lithium ion performance index difference.

[0020] Furthermore, the step of performing adjustment feedback according to the lithium ion performance index difference includes: matching the lithium ion performance index difference with the difference level corresponding to each lithium ion performance index difference preset in the lithium ion evaluation database, obtaining the difference level corresponding to the lithium ion performance index difference, and performing adjustment feedback according to the difference level.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] 1. The present invention provides a method for evaluating the active preparation performance of all-solid-state batteries, thereby comprehensively reflecting the actual situation of lithium ion transmission in the active preparation process of all-solid-state batteries, avoiding the evaluation bias that may be caused by a single data source, and thus achieving improved accuracy and reliability of the evaluation results.

[0023] 2. The present invention compares the lithium ion performance index with a preset threshold value, thereby being able to promptly detect possible abnormalities or downward trends in battery performance, making it easier to take appropriate measures for intervention and adjustment, thereby achieving precise control of the lithium ion transmission efficiency and the overall performance of the battery.

[0024] 3. The present invention obtains the lithium ion performance index threshold by matching the battery environmental adaptability evaluation value, so as to more accurately evaluate the performance of all-solid-state batteries under different environmental conditions, thereby realizing refined management and optimization of battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Flow chart of the method for evaluating the activity preparation performance of all-solid-state batteries provided in the embodiments of the present application.

[0026] Figure 2 A graph showing changes in the battery environmental adaptability assessment value of the all-solid-state battery activity preparation performance assessment method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The embodiment of the present application provides a method for evaluating the active preparation performance of an all-solid-state battery, thereby solving the problem that the evaluation method in the prior art may only be applicable to sample testing under laboratory conditions, but may be limited by external interference in actual applications, resulting in the applicability of the evaluation method being affected. The battery environmental adaptability evaluation value is obtained by comprehensive analysis based on the battery environmental data, and a lithium ion performance index threshold is obtained by matching the battery environmental adaptability evaluation value; a lithium ion state evaluation value is obtained by comprehensive analysis based on the lithium ion state data, an electrolyte influence index is obtained by comprehensive analysis based on the electrolyte state data, a lithium ion performance index is obtained by comprehensive analysis, and evaluation feedback is performed based on the lithium ion performance index and the lithium ion performance index threshold, thereby improving the universality and accuracy of the evaluation method.

[0028] The technical solution in the embodiment of the present application is to solve the problem that the above evaluation method may only be applicable to sample testing under laboratory conditions, and in actual application it may be limited by external interference, resulting in the applicability of the evaluation method being affected. The overall idea is as follows:

[0029] By acquiring battery environment data, electrolyte status data and lithium ion status data; obtaining the battery environment adaptability evaluation value based on comprehensive analysis of the battery environment data, and obtaining the lithium ion performance index threshold based on matching the battery environment adaptability evaluation value; obtaining the lithium ion status evaluation value based on comprehensive analysis of the lithium ion status data, obtaining the electrolyte influence index based on comprehensive analysis of the electrolyte status data, obtaining the lithium ion performance index through comprehensive analysis, and conducting evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold, the effect of comprehensively evaluating battery performance, dynamically adjusting performance thresholds, timely discovering potential problems, optimizing battery design and preparation process, and improving battery safety and reliability is achieved.

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 As shown, it is a flow chart of the all-solid-state battery activity preparation performance evaluation method provided in an embodiment of the present application, and the method includes the following steps: acquiring battery environment data, electrolyte state data and lithium ion state data; obtaining a battery environment adaptability evaluation value according to a comprehensive analysis of the battery environment data, and obtaining a lithium ion performance index threshold according to matching of the battery environment adaptability evaluation value; obtaining a lithium ion state evaluation value according to a comprehensive analysis of the lithium ion state data, obtaining an electrolyte influence index according to a comprehensive analysis of the electrolyte state data, obtaining a lithium ion performance index through comprehensive analysis, and performing evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold.

[0032] In this embodiment, the lithium ion performance index threshold refers to the minimum allowable value of the lithium ion performance index set to ensure the normal, safe and efficient operation of the lithium ion battery under specific environmental conditions. By integrating the information of battery environmental data, electrolyte status data and lithium ion status data, a more comprehensive understanding of the working status and performance of the battery can be obtained, which helps to timely discover the degradation of battery performance or potential safety hazards; long-term data accumulation and analysis helps to deeply understand the influencing factors and changing laws of battery performance, provide strong data support for battery research and development and optimization, and promote the progress and development of battery technology.

[0033] In addition, the lithium ion evaluation database is used to store data related to the lithium ion transport performance evaluation method of the active preparation process of all-solid-state batteries, including: reference ambient temperature, allowable deviation ambient temperature, critical ambient pressure value, reference ambient humidity, allowable deviation ambient humidity, battery environmental adaptability evaluation influencing factor corresponding to ambient temperature, lithium ion performance index threshold and lithium ion performance index threshold corresponding to each battery environmental adaptability evaluation value interval, etc. The data in the lithium ion evaluation database can be obtained by direct measurement using relevant electrochemical testing methods, or by referring to academic literature in the field related to the active preparation process of all-solid-state batteries to collect and organize the lithium ion transport performance data mentioned in the literature, or by subscribing to a commercial battery database to obtain it directly.

[0034] Furthermore, the step of obtaining a battery environmental adaptability evaluation value based on a comprehensive analysis of the battery environmental data includes: the battery environmental data includes an ambient temperature, an ambient pressure value, and an ambient humidity; obtaining a reference ambient temperature, an allowable deviation ambient temperature, a critical ambient pressure value, a reference ambient humidity, and an allowable deviation ambient humidity from a lithium ion evaluation database; and obtaining a battery environmental adaptability evaluation value through a comprehensive analysis.

[0035] The battery environmental adaptability evaluation value is obtained as follows:

[0036]

[0037] Wherein, ξC represents the battery environmental adaptability evaluation value, β1 represents the battery environmental adaptability evaluation influencing factor corresponding to the ambient temperature, β2 represents the battery environmental adaptability evaluation influencing factor corresponding to the ambient pressure value, β3 represents the battery environmental adaptability evaluation influencing factor corresponding to the ambient humidity, T1 represents the ambient temperature, T0 represents the reference ambient temperature, T2 represents the allowable deviation ambient temperature, H1 represents the ambient humidity, H0 represents the reference ambient humidity, H2 represents the allowable deviation ambient humidity, S0 represents the critical ambient pressure value, and S1 represents the ambient pressure value.

[0038] β1, β2 and β3 are the battery environmental adaptability assessment influencing factors corresponding to the ambient temperature, ambient pressure value and ambient humidity preset in the lithium ion assessment database, respectively, and represent the numerical values ​​of the degree of influence of the ambient temperature, ambient pressure value and ambient humidity on the battery environmental adaptability assessment value, and can be directly obtained from the lithium ion assessment database when used. For example, the ambient temperature and the battery environmental adaptability assessment influencing factors corresponding to the ambient temperature preset in the lithium ion assessment database form a mapping set, and the battery environmental adaptability assessment influencing factors corresponding to the ambient temperature are obtained by inputting the mapping set according to the ambient temperature; the ambient pressure value and the battery environmental adaptability assessment influencing factors corresponding to the ambient pressure value preset in the lithium ion assessment database form a mapping set, and the battery environmental adaptability assessment influencing factors corresponding to the ambient pressure value are obtained by inputting the mapping set according to the ambient pressure value; the ambient humidity and the battery environmental adaptability assessment influencing factors corresponding to the ambient humidity preset in the lithium ion assessment database form a mapping set, and the battery environmental adaptability assessment influencing factors corresponding to the ambient humidity are obtained by inputting the mapping set according to the ambient humidity, wherein the mapping relationship is a many-to-one or one-to-one relationship, and the value range of the influencing factor in this embodiment is between 0 and 1.

[0039] In this embodiment, the ambient temperature can be directly measured by installing a temperature sensor such as a thermocouple or a digital temperature sensor on the battery module; the ambient pressure value refers to the atmospheric pressure on the outside of the solid-state battery, which can be directly measured by installing a pressure sensor such as a piezoresistive pressure sensor or a capacitive pressure sensor on the outside of the battery; the ambient humidity can be measured by measuring the external environment of the battery using a humidity sensor such as a capacitive humidity sensor or a resistive humidity sensor. There is a certain correlation between the ambient temperature, ambient pressure value and ambient humidity. For example, changes in temperature may affect the water vapor content in the air, thereby affecting humidity; and changes in pressure may affect the solubility of the gas, thereby affecting the electrolyte performance of the battery. By comprehensively analyzing the ambient temperature, ambient pressure value and ambient humidity, the battery environmental adaptability evaluation value can be obtained, which reflects the performance and safety level of the battery under the current environmental conditions, and provides strong support for the use and maintenance of the battery.

[0040] The battery environmental adaptability assessment impact factor corresponding to the ambient temperature is set to 0.3, the battery environmental adaptability assessment impact factor corresponding to the ambient pressure value is set to 0.4, the battery environmental adaptability assessment impact factor corresponding to the ambient humidity is set to 0.3, the ambient temperature is set to 20°C, the reference ambient temperature is 10°C, the allowable deviation ambient temperature is set to 10°C, the ambient humidity is set to 45%, the reference ambient humidity is set to 50%, the allowable deviation ambient humidity is set to 10%, and the critical ambient pressure value is set to 400MPa. When the ambient pressure value continues to increase, the battery environmental adaptability assessment value is calculated. As shown in Table 1, the battery environmental adaptability assessment value data table based on the lithium ion transmission performance assessment method.

[0041] Table 1 Data table of battery environmental adaptability evaluation values ​​based on lithium ion transmission performance evaluation method

[0042] serial number <![CDATA[S1(MPa)]]> ξC 1 300 1.223 2 350 1.147 3 400 1.090 4 450 1.045 5 500 1.010

[0043] like Figure 2 As shown in Table 1 and Figure 2 It can be seen that when the battery environmental adaptability assessment influencing factor corresponding to the ambient temperature, the battery environmental adaptability assessment influencing factor corresponding to the ambient pressure value, the battery environmental adaptability assessment influencing factor corresponding to the ambient humidity, the ambient temperature, the reference ambient temperature, the allowable deviation ambient temperature, the ambient humidity, the reference ambient humidity, the allowable deviation ambient humidity and the critical ambient pressure value remain unchanged, and the ambient pressure value continues to increase, the battery environmental adaptability assessment value will continue to decrease.

[0044] Furthermore, the step of obtaining a lithium ion performance index threshold value according to the battery environmental adaptability evaluation value matching includes: matching the battery environmental adaptability evaluation value with the lithium ion performance index threshold values ​​corresponding to each battery environmental adaptability evaluation value interval preset in a lithium ion evaluation database to obtain the lithium ion performance index threshold value corresponding to the battery environmental adaptability evaluation value interval.

[0045] In this embodiment, by matching the battery environmental adaptability evaluation value with the lithium ion performance index threshold, the lithium ion transmission performance of the battery under different environmental conditions can be more accurately evaluated. This helps to promptly discover battery performance degradation or potential safety hazards and ensure the normal operation of the battery. The lithium ion performance index threshold corresponding to each battery environmental adaptability evaluation value interval is a numerical value of the degree of influence of each battery environmental adaptability evaluation value interval preset in the lithium ion evaluation database on the lithium ion performance index threshold, which can be directly obtained from the lithium ion evaluation database when used. For example, each battery environmental adaptability evaluation value interval and each lithium ion performance index threshold preset in the lithium ion evaluation database form a mapping set, and the lithium ion performance index threshold corresponding to a battery environmental adaptability evaluation value interval is obtained according to the mapping set input of a battery environmental adaptability evaluation value interval, wherein the mapping relationship is a many-to-one or one-to-one relationship.

[0046] Furthermore, the step of obtaining a lithium ion state evaluation value based on a comprehensive analysis of the lithium ion state data includes: the lithium ion state data includes lithium ion conductivity, lithium ion activation energy and lithium ion migration number; obtaining critical lithium ion conductivity, critical lithium ion activation energy and critical lithium ion migration number from a lithium ion evaluation database; and obtaining a lithium ion state evaluation value through comprehensive analysis.

[0047] The lithium ion status evaluation value is obtained as follows:

[0048]

[0049] Wherein, ξS represents the lithium ion state evaluation value, α6 represents the lithium ion state evaluation influence factor corresponding to the lithium ion conductivity, α7 represents the lithium ion state evaluation influence factor corresponding to the lithium ion activation energy, α8 represents the lithium ion state evaluation influence factor corresponding to the lithium ion migration number, C1 represents the lithium ion conductivity, C0 represents the critical lithium ion conductivity, A1 represents the lithium ion activation energy, A0 represents the critical lithium ion activation energy, N1 represents the lithium ion migration number, and N0 represents the critical lithium ion migration number.

[0050] α6, α7 and α8 are lithium ion state assessment influencing factors corresponding to lithium ion conductivity, lithium ion activation energy and lithium ion migration number preset in the lithium ion assessment database, respectively, indicating the numerical values ​​of the influence of lithium ion conductivity, lithium ion activation energy and lithium ion migration number on the lithium ion state assessment value, and can be directly obtained from the lithium ion assessment database when used. For example, the lithium ion conductivity and the lithium ion state assessment influencing factors corresponding to the lithium ion conductivity preset in the lithium ion assessment database form a mapping set, and the lithium ion state assessment influencing factors corresponding to the lithium ion conductivity are obtained by inputting the mapping set according to the lithium ion conductivity; the lithium ion activation energy and the lithium ion state assessment influencing factors corresponding to the lithium ion activation energy preset in the lithium ion assessment database form a mapping set, and the lithium ion state assessment influencing factors corresponding to the lithium ion activation energy are obtained by inputting the mapping set according to the lithium ion activation energy; the lithium ion migration number and the lithium ion state assessment influencing factors corresponding to the lithium ion migration number preset in the lithium ion assessment database form a mapping set, and the lithium ion state assessment influencing factors corresponding to the lithium ion migration number are obtained by inputting the mapping set according to the lithium ion migration number, wherein the mapping relationship is a many-to-one or one-to-one relationship, and the value range of the influencing factor in this embodiment is between 0 and 1.

[0051] In this embodiment, lithium ion conductivity refers to the ability of ions in an electrolyte solution to conduct current, which can be directly measured by an electrochemical workstation, a conductivity tester, or an impedance analyzer. The lithium ion migration number refers to the migration rate of lithium ions in an electrolyte, which is one of the important indicators for evaluating the ionic conductivity of an electrolyte. The lithium ion migration number can be directly measured by using a lithium ion battery electrolyte lithium ion migration number test device. The lithium ion activation energy refers to the minimum energy barrier that lithium ions need to pass through to enter the negative electrode material (such as graphite). The lithium ion conductivity at different temperatures can be measured, and the relationship between lithium ion conductivity and temperature can be described using the Arrhenius equation, and then the activation energy can be calculated. The correlation formula between the conductivity and temperature is: σ = σ0*exp(-Ea / (kB*T)); where σ is the conductivity, σ0 is the prefactor (a constant independent of temperature), Ea is the activation energy, and kB is the Boltzmann constant (approximately 1.381*10 -23 J / K), T is the absolute temperature. There is a certain correlation between lithium ion conductivity, lithium ion activation energy and lithium ion migration number. For example, the level of lithium ion conductivity will affect the migration rate of lithium ions, because lithium ion conductivity reflects the number and degree of ionization of ions in the solution, thus affecting the transmission efficiency of lithium ions; the smaller the lithium ion activation energy, the easier it is for lithium ions to diffuse in the material, and the faster the migration rate; at the same time, the lithium ion migration number itself is a measure of the lithium ion migration rate, and together with lithium ion conductivity and activation energy, it affects the performance of the battery. The comprehensive evaluation of lithium ion conductivity, lithium ion activation energy and lithium ion migration number can accurately obtain the lithium ion state evaluation value, which reflects the lithium ion transmission performance of the battery in the current state.

[0052] Furthermore, the step of obtaining an electrolyte influence index through comprehensive analysis based on electrolyte status data includes: the electrolyte status data includes interface contact resistance, stacking pressure and electrolyte membrane thickness; obtaining critical interface contact resistance, reference stacking pressure, allowable deviation stacking pressure, reference electrolyte membrane thickness and allowable deviation electrolyte membrane thickness from a lithium ion evaluation database; and obtaining an electrolyte influence index through comprehensive analysis.

[0053] The electrolyte impact index is obtained as follows:

[0054]

[0055] Wherein, ξE represents the electrolyte influence index, α3 represents the electrolyte influence index influence factor corresponding to the interface contact resistance, α4 represents the electrolyte influence index influence factor corresponding to the stacking pressure, α5 represents the electrolyte influence index influence factor corresponding to the electrolyte membrane thickness, R1 represents the interface contact resistance, R0 represents the critical interface contact resistance, P1 represents the stacking pressure, P0 represents the reference stacking pressure, P2 represents the allowable deviation stacking pressure, M1 represents the electrolyte membrane thickness, M0 represents the reference electrolyte membrane thickness, and M2 represents the allowable deviation electrolyte membrane thickness.

[0056] α3, α4 and α5 are the electrolyte influence index influence factors corresponding to the interface contact resistance, stacking pressure and electrolyte membrane thickness preset in the lithium ion evaluation database, respectively, which respectively represent the numerical values ​​of the influence degree of the interface contact resistance, stacking pressure and electrolyte membrane thickness on the electrolyte influence index, and can be directly obtained from the lithium ion evaluation database when used. For example, the interface contact resistance and the electrolyte influence index influence factors corresponding to the interface contact resistance preset in the lithium ion evaluation database form a mapping set, and the electrolyte influence index influence factors corresponding to the interface contact resistance are obtained according to the interface contact resistance input mapping set; the stacking pressure and the electrolyte influence index influence factors corresponding to the stacking pressure preset in the lithium ion evaluation database form a mapping set, and the electrolyte influence index influence factors corresponding to the stacking pressure are obtained according to the stacking pressure input mapping set; the electrolyte membrane thickness and the electrolyte influence index influence factors corresponding to the electrolyte membrane thickness preset in the lithium ion evaluation database form a mapping set, and the electrolyte influence index influence factors corresponding to the electrolyte membrane thickness are obtained according to the electrolyte membrane thickness input mapping set, wherein the mapping relationship is a many-to-one or one-to-one relationship, and the value range of the influence factor in this embodiment is between 0 and 1.

[0057] In this embodiment, the interface contact resistance refers to the contact resistance between the electrode and the solid electrolyte in the solid-state battery, which can be obtained by applying a certain voltage across the battery, measuring the current passing through the battery, and then calculating the resistance according to Ohm's law; the stacking pressure refers to the pressure difference on both sides of the electrolyte membrane, which can be obtained by using a pressure sensor or a strain gauge to measure the pressure difference on both sides of the electrolyte membrane; the electrolyte membrane thickness refers to the thickness of the electrolyte membrane, which can be directly measured by a thickness gauge measurement method, an AC impedance measurement method, etc. By comprehensively analyzing the interface contact resistance, stacking pressure, and electrolyte membrane thickness, the electrolyte influence index can be obtained, which can reflect the performance of the electrolyte in the battery.

[0058] Furthermore, the step of comprehensively analyzing and obtaining the lithium ion performance index includes: collecting and analyzing the compatibility data of the electrolyte and lithium ions to obtain the lithium ion performance influence index; obtaining the critical lithium ion state evaluation value and the critical electrolyte influence index from the lithium ion evaluation database; and comprehensively analyzing and obtaining the lithium ion performance index.

[0059] In this embodiment, the lithium ion performance impact index is an indicator that comprehensively reflects the impact of the compatibility of electrolyte and lithium ions on lithium ion performance. When the compatibility of electrolyte and lithium ions is high, more chemical reactions are generated, and the lithium ion performance impact index will be larger; conversely, when the compatibility of electrolyte and lithium ions is low, the lithium ion performance impact index will be smaller. The level of the electrolyte impact index will directly affect the lithium ion performance impact index, because the electrolyte is the medium for lithium ion migration and reaction; at the same time, the lithium ion state evaluation value will also be affected by the electrolyte, because the properties of the electrolyte will determine the activity environment and state of lithium ions. By comprehensively analyzing these three indexes, the performance state of the battery can be comprehensively evaluated, and the direction and potential of battery performance improvement can be predicted based on the changing trends and mutual relationships of the three indexes. For example, if there is a large room for improvement in the electrolyte impact index, then the battery performance may be significantly improved by optimizing the electrolyte formula.

[0060] Furthermore, collecting and analyzing the compatibility data of the electrolyte and lithium ions to obtain the lithium ion performance influence index comprises the steps of: obtaining a compatibility relationship diagram according to the change in the relationship between the compatibility data of the electrolyte and lithium ions and the lithium ion performance influence index; and obtaining the lithium ion performance influence index according to processing the compatibility relationship diagram.

[0061] In the present embodiment, the compatibility data is obtained by mixing the electrolyte with lithium ions multiple times in the same test environment and content, testing using electrochemical impedance spectroscopy or scanning electron microscopy, and extracting the interface compatibility of the electrolyte and the electrode material based on the obtained test data. When obtaining the compatibility relationship diagram, first clarify that the test conditions of the electrolyte and the lithium ion are consistent, and then continuously select electrolytes with different compatibilities with lithium ions for testing, and obtain the lithium ion performance impact index corresponding to each compatibility data, and use the compatibility data of the electrolyte and the lithium ion as the horizontal coordinate and the lithium ion performance impact index as the vertical coordinate to draw a scatter plot, which is the compatibility relationship diagram. Therefore, when the lithium ion performance impact index is obtained according to the compatibility relationship diagram, the compatibility data of the electrolyte and the lithium ion are substituted into the compatibility relationship diagram to obtain the lithium ion performance impact index corresponding to the compatibility data.

[0062] Furthermore, the lithium ion performance index is obtained as follows:

[0063]

[0064] Wherein, ξP represents the lithium ion performance index, α1 represents the lithium ion performance influence factor corresponding to the lithium ion state evaluation value, α2 represents the lithium ion performance influence factor corresponding to the electrolyte influence index, ξS1 represents the lithium ion state evaluation value, ξS0 represents the critical lithium ion state evaluation value, ξE1 represents the electrolyte influence index, ξE0 represents the critical electrolyte influence index, ξP0 represents the lithium ion performance influence index, and e is a natural constant.

[0065] In this embodiment, α1 and α2 are respectively the lithium ion state evaluation value and the lithium ion performance influence factor corresponding to the electrolyte influence index preset in the lithium ion evaluation database, which respectively represent the numerical values ​​of the influence degree of the lithium ion state evaluation value and the electrolyte influence index on the lithium ion performance index, and can be directly obtained from the lithium ion evaluation database when used. For example, the lithium ion state evaluation value and the lithium ion performance influence factor corresponding to the lithium ion state evaluation value preset in the lithium ion evaluation database form a mapping set, and the lithium ion performance influence factor corresponding to the lithium ion state evaluation value is obtained according to the input mapping set of the lithium ion state evaluation value; the electrolyte influence index and the lithium ion performance influence factor corresponding to the electrolyte influence index preset in the lithium ion evaluation database form a mapping set, and the lithium ion performance influence factor corresponding to the electrolyte influence index is obtained according to the input mapping set of the electrolyte influence index, wherein the mapping relationship is a many-to-one or one-to-one relationship, and the value range of the influence factor in this embodiment is between 0 and 1.

[0066] Furthermore, the step of providing evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold includes: comparing the lithium ion performance index with the lithium ion performance index threshold; if the lithium ion performance index is greater than or equal to the lithium ion performance index threshold, it means that the lithium ion transmission performance is qualified and no additional operation is performed; if the lithium ion performance index is less than the lithium ion performance index threshold, it means that the lithium ion transmission performance is unqualified; the difference between the lithium ion performance index threshold and the lithium ion performance index is marked as the lithium ion performance index difference; and adjustment feedback is performed based on the lithium ion performance index difference.

[0067] In this embodiment, the lithium ion performance index threshold is a standard value used to evaluate whether the lithium ion transmission performance is qualified. When the lithium ion performance index is lower than the threshold, the direction and degree of optimization can be determined according to the lithium ion performance index difference, which helps R&D personnel to quickly locate the problem and take corresponding measures to improve it. In the production process, by real-time monitoring of the lithium ion performance index and comparing it with the threshold, batteries with unqualified performance can be discovered in time to avoid the outflow of defective products, thereby improving production efficiency.

[0068] Furthermore, the step of performing adjustment feedback according to the lithium ion performance index difference includes: matching the lithium ion performance index difference with the difference level corresponding to each lithium ion performance index difference preset in the lithium ion evaluation database, obtaining the difference level corresponding to the lithium ion performance index difference, and performing adjustment feedback according to the difference level.

[0069] In this embodiment, the difference level includes slight difference, medium difference and severe difference. When the difference is slight, a preliminary analysis is conducted on the cause of the slight difference, which may be test error, slight fluctuation of materials, etc., and monitoring and observation are strengthened to ensure that the change trend of the lithium ion performance index is within an acceptable range. Fine-tuning measures can be taken, such as adjusting production process parameters, optimizing material ratios, etc., to improve lithium ion performance; when the difference is medium, an in-depth analysis is conducted on the cause of the medium difference, which may require more detailed test data, material analysis or process review. According to the analysis results, improvement measures are formulated and implemented, such as replacing some materials, adjusting The production process flow should be adjusted, the battery design should be optimized, etc. After the improvement measures are implemented, the changes in the lithium-ion performance index should be continuously monitored to ensure the effectiveness of the improvement measures; when the difference is serious, the emergency response mechanism should be immediately activated to stop the production or sales of batteries that may be affected, to prevent defective products from entering the market, and the battery design, material selection, production process, etc. should be comprehensively reviewed to find out the root cause of the serious difference. According to the review results, major improvement measures should be formulated and implemented, such as replacing the main materials, redesigning the battery structure, optimizing the production process flow, etc. After the improvement measures are implemented, strict testing and verification should be carried out to ensure that the battery performance meets the design requirements. For example, the current lithium-ion performance index threshold is 1.2, and the lithium-ion performance index is 1.12, so the current lithium-ion performance index difference is 0.08, and the lithium-ion performance index difference range corresponding to the slight difference level preset in the lithium-ion evaluation database is (0, 0.05), and the cloud computing platform status evaluation difference range corresponding to the medium difference level is [0.05, 0.1], and the cloud computing platform status evaluation difference range corresponding to the severe difference level is greater than 0.1, so the current cloud computing platform status abnormality level is medium difference.

[0070] In summary, the embodiments of the present application obtain a battery environmental adaptability evaluation value by comprehensive analysis based on the battery environmental data, and obtain a lithium ion performance index threshold value by matching the battery environmental adaptability evaluation value; obtain a lithium ion state evaluation value by comprehensive analysis based on the lithium ion state data, obtain an electrolyte influence index by comprehensive analysis based on the electrolyte state data, obtain a lithium ion performance index by comprehensive analysis, and perform evaluation feedback based on the lithium ion performance index and the lithium ion performance index threshold, thereby achieving improved universality and accuracy of the evaluation method.

[0071] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the activity preparation performance of an all-solid-state battery, characterized in that: The following steps are involved: Obtain battery environment data, electrolyte state data and lithium ion state data; Obtaining a battery environmental adaptability evaluation value based on comprehensive analysis of battery environmental data, and obtaining a lithium ion performance index threshold based on matching of the battery environmental adaptability evaluation value; A lithium ion status evaluation value is obtained based on a comprehensive analysis of the lithium ion status data, an electrolyte influence index is obtained based on a comprehensive analysis of the electrolyte status data, a lithium ion performance index is obtained based on a comprehensive analysis, and evaluation feedback is performed based on the lithium ion performance index and the lithium ion performance index threshold.

2. The method for evaluating the activity preparation performance of an all-solid-state battery according to claim 1, characterized in that: The step of obtaining the battery environmental adaptability evaluation value based on comprehensive analysis of the battery environmental data comprises: The battery environment data includes the environment temperature, environment pressure value and environment humidity; Obtaining a reference ambient temperature, an allowable deviation ambient temperature, a critical ambient pressure value, a reference ambient humidity, and an allowable deviation ambient humidity from a lithium ion evaluation database; Comprehensive analysis is performed to obtain the battery environmental adaptability assessment value.

3. The method for evaluating the activity preparation performance of all-solid-state batteries according to claim 1, characterized in that: The step of obtaining the lithium ion performance index threshold value according to the battery environmental adaptability evaluation value includes: The battery environmental adaptability evaluation value is matched with the lithium ion performance index threshold value corresponding to each battery environmental adaptability evaluation value interval preset in the lithium ion evaluation database to obtain the lithium ion performance index threshold value corresponding to the battery environmental adaptability evaluation value interval.

4. The method for evaluating the activity preparation performance of an all-solid-state battery according to claim 1, characterized in that: The step of obtaining a lithium ion status evaluation value based on comprehensive analysis of the lithium ion status data comprises: The lithium ion state data includes lithium ion conductivity, lithium ion activation energy and lithium ion migration number; Obtain critical lithium ion conductivity, critical lithium ion activation energy, and critical lithium ion transference number from the lithium ion evaluation database; Comprehensive analysis is performed to obtain the lithium ion status assessment value.

5. The method for evaluating the activity preparation performance of an all-solid-state battery according to claim 1, characterized in that: The step of obtaining the electrolyte impact index based on comprehensive analysis of the electrolyte status data comprises: The electrolyte state data includes interface contact resistance, stacking pressure and electrolyte membrane thickness; Obtaining critical interface contact resistance, reference stacking pressure, allowable deviation stacking pressure, reference electrolyte membrane thickness, and allowable deviation electrolyte membrane thickness from a lithium ion evaluation database; The electrolyte impact index was obtained through comprehensive analysis.

6. The method for evaluating the activity preparation performance of all-solid-state batteries according to claim 1, characterized in that: The step of comprehensively analyzing and obtaining the lithium ion performance index comprises: Collect and analyze the compatibility data between electrolyte and lithium ion to obtain the lithium ion performance impact index; Obtaining a critical lithium ion state evaluation value and a critical electrolyte impact index from a lithium ion evaluation database; The lithium ion performance index is obtained through comprehensive analysis.

7. The method for evaluating the activity preparation performance of an all-solid-state battery according to claim 6, characterized in that: The step of collecting and analyzing the compatibility data of the electrolyte and the lithium ion to obtain the lithium ion performance influence index comprises: According to the changes in the relationship between the compatibility data of electrolyte and lithium ions and the lithium ion performance influence index, a compatibility relationship diagram is obtained; The lithium ion performance impact index is obtained according to the compatibility relationship diagram.

8. The method for evaluating the activity preparation performance of all-solid-state batteries according to claim 6, characterized in that: The lithium ion performance index is obtained as follows: Wherein, ξP represents the lithium ion performance index, α1 represents the lithium ion performance influence factor corresponding to the lithium ion state evaluation value, α2 represents the lithium ion performance influence factor corresponding to the electrolyte influence index, ξS1 represents the lithium ion state evaluation value, ξS0 represents the critical lithium ion state evaluation value, ξE1 represents the electrolyte influence index, ξE0 represents the critical electrolyte influence index, ξP0 represents the lithium ion performance influence index, and e is a natural constant.

9. The method for evaluating the activity preparation performance of all-solid-state batteries according to claim 1, characterized in that: The step of providing evaluation feedback according to the lithium ion performance index and the lithium ion performance index threshold comprises: The lithium ion performance index is compared with the lithium ion performance index threshold. If the lithium ion performance index is greater than or equal to the lithium ion performance index threshold, it means that the lithium ion transmission performance is qualified and no additional operation is performed. If the lithium ion performance index is less than the lithium ion performance index threshold, it means that the lithium ion transmission performance is unqualified. The difference between the lithium ion performance index threshold and the lithium ion performance index is marked as the lithium ion performance index difference, and adjustment feedback is performed based on the lithium ion performance index difference.

10. The method for evaluating the activity preparation performance of all-solid-state batteries according to claim 9, characterized in that: The step of adjusting and feeding back according to the lithium ion performance index difference comprises: The lithium ion performance index difference is matched with the difference level corresponding to each lithium ion performance index difference preset in the lithium ion evaluation database to obtain the difference level corresponding to the lithium ion performance index difference, and adjustment feedback is performed according to the difference level.

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