An intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate

Abstract

The present invention relates to the field of magnetic component detection technology, and specifically to an intelligent detection method for the content of magnetic substances in a battery-grade lithium carbonate, including: obtaining a voltage-current curve of a solution to be tested and all ion standard solutions at all concentrations; and calculating the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment; intercepting the peak segment in the voltage-current curve of each ion standard solution at each concentration, and obtaining the similarity between the peak segment and each ion standard solution in terms of conductivity; according to the similarity between the peak segment and the ion standard solution in terms of conductivity, combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, obtaining the content of each in the solution to be tested, and obtaining the content of magnetic substances in the battery-grade lithium carbonate. The present invention accurately obtains the content of magnetic substances in the solution to be tested by analyzing the similarity between the solution to be tested and all standard solutions.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic component detection, and in particular to an intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate. Background Art

[0002] Since battery-grade lithium carbonate is the key raw material for producing lithium-ion battery positive electrode materials, in order to ensure the quality of the produced lithium-ion battery positive electrodes, it is necessary to detect the content of magnetic substances in battery-grade lithium carbonate; however, the traditional method of obtaining the content of magnetic substances in lithium carbonate by measuring the voltage-current curve of the magnetic substance solution in lithium carbonate does not take into account the mutual influence between different ions, resulting in inaccurate measured content of magnetic substances. Summary of the invention

[0003] The present invention provides an intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate to solve the existing problem that the content of magnetic substances cannot be accurately measured by measuring the voltage-current curve of a magnetic substance solution in lithium carbonate in the traditional method.

[0004] The intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate of the present invention adopts the following technical scheme:

[0005] The following steps are involved:

[0006] Obtain the voltage-current curves of the test solution and all ion standard solutions at all concentrations;

[0007] Intercepting the peak segment in the voltage-current curve of the solution to be tested, and obtaining the curve segment corresponding to the peak segment in the standard solution; obtaining the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment according to the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution;

[0008] The peak segment in the voltage-current curve of each ion standard solution at each concentration is intercepted, and the peak segment is divided into a left half peak segment and a right half peak segment; according to the distribution trend of the data points in the left half peak segment and the right half peak segment of the same ion standard solution at different concentrations, the conductivity of the left half peak segment and the right half peak segment of each ion standard solution is obtained;

[0009] The peak segment is divided into a left half peak segment and a right half peak segment; according to the changes of the data points in the left half peak segment and the right half peak segment, the conductivity of the left half peak segment and the right half peak segment is obtained; according to the difference in conductivity between the left half peak segment and the left half peak segment, and the right half peak segment and the right half peak segment, the similarity in conductivity between the peak segment and each ion standard solution is obtained;

[0010] According to the similarity between the peak segment and the ion standard solution in conductivity, combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, the similarity between each ion standard solution and the peak segment at each concentration is obtained; according to the similarity between each ion standard solution and the peak segment at each concentration, combined with the concentration of each ion standard solution at each concentration, the content of each in the solution to be tested is obtained, and the content of magnetic substances in battery-grade lithium carbonate is obtained.

[0011] Preferably, the method of intercepting the peak segment in the voltage-current curve of the solution to be tested and obtaining the curve segment corresponding to the peak segment in the standard solution includes the following specific methods:

[0012] The three largest maximum points in the voltage-current curve of the solution to be tested are recorded as peak points, and the minimum points adjacent to each peak point are recorded as the endpoints of each peak point; the curve segment between the endpoints of the peak points is recorded as the peak segment;

[0013] For any ion standard solution voltage-current curve at any concentration and any peak segment, the voltage range of the peak segment is obtained, and the curve segment in the voltage-current curve segment of the standard solution that is located in the voltage range of the peak segment is recorded as the curve segment corresponding to the peak segment in the standard solution.

[0014] Preferably, the method of obtaining the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment according to the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution comprises the following specific methods:

[0015] For any peak segment and the curve segment corresponding to the peak segment in any ion standard solution at any concentration; the difference in the maximum amplitude between the peak segment and the corresponding curve segment is recorded as the first difference factor; the average of the differences between the amplitudes corresponding to all the same voltages in the peak segment and the corresponding curve segment is recorded as the second difference factor; the product of the first difference factor and the difference factor is recorded as the degree of difference between the corresponding curve segment and the peak segment, and the degree of similarity between the corresponding curve segment and the peak segment is obtained according to the degree of difference between the corresponding curve segment and the peak segment; the degree of difference between the corresponding curve segment and the peak segment is negatively correlated with the degree of similarity between the corresponding curve segment and the peak segment.

[0016] Preferably, the method of intercepting the peak segment in the voltage-current curve of each ion standard solution at each concentration and dividing the peak segment into a left half peak segment and a right half peak segment includes the following specific methods:

[0017] For any ion standard solution at any concentration, the largest maximum point in the voltage-current curve of the standard solution is recorded as the peak point, the minimum point adjacent to the peak point is recorded as the endpoint of the peak point, the curve segment between the endpoints of the peak point is recorded as the peak segment, and the data point with the largest amplitude in the peak segment is used as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment.

[0018] Preferably, the specific method of obtaining the conductivity of the left half-wave peak segment and the right half-wave peak segment of each ion standard solution according to the distribution trend of data points in the left half-wave peak segment and the right half-wave peak segment of the same ion standard solution at different concentrations includes:

[0019] For any ion standard solution at any concentration, the ratio of the difference between the current value of the maximum point in the ion standard solution and the current value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, and the difference between the voltage value of the maximum point in the ion standard solution and the voltage value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, is recorded as the first conductivity factor of the standard solution; the average slope of all data points in the left half-wave peak segment of the ion standard solution is recorded as the second conductivity factor of the standard solution; the absolute value of the product of the first conductivity factor and the second conductivity factor of the standard solution is taken as the conductivity performance of the left half-wave peak segment of the ion standard solution;

[0020] The average value of the conductivity of all ion standard solutions of the same type at different concentrations is taken as the conductivity of the left half-wave peak of the ion standard solution;

[0021] Similarly, the conductivity of the right half-wave peak of the ion standard solution is obtained.

[0022] Preferably, the step of dividing the peak segment into a left half peak segment and a right half peak segment comprises the following specific methods:

[0023] Corresponding to any peak segment, the data point with the largest amplitude in the peak segment is used as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment.

[0024] Preferably, the specific method of obtaining the conductivity of the left half peak segment and the right half peak segment according to the change of the data points in the left half peak segment and the right half peak segment is as follows:

[0025] For any peak segment, the ratio of the difference between the current value of the maximum point in the peak segment and the current value corresponding to the data point with the smallest amplitude in the left half peak segment, and the difference between the voltage value of the maximum point in the peak segment and the voltage value corresponding to the data point with the smallest amplitude in the left half peak segment, is recorded as the first conductivity factor of the peak segment; the average slope of all data points in the left half peak segment is recorded as the second conductivity factor of the peak segment; the absolute value of the product of the first conductivity factor and the second conductivity factor of the peak segment is taken as the conductivity performance of the left half peak segment;

[0026] Similarly, the conductivity of the right half peak segment is obtained.

[0027] Preferably, the similarity between the peak segment and each ion standard solution in terms of conductivity is obtained based on the difference in conductivity between the left half-wave peak segment and the left half-peak segment, and between the right half-wave peak segment and the right half-peak segment, and the specific method includes:

[0028] The difference in conductivity between the left half peak segment and the left half wave peak segment is recorded as the left half difference, and the difference in conductivity between the right half peak segment and the right half wave peak segment is recorded as the right half difference; the left half difference and the right half difference are recorded as the conductivity difference between the peak segment and the ion standard solution, and the difference in conductivity between the peak segment and the ion standard solution is obtained based on the conductivity difference between the peak segment and the ion standard solution, and the similarity in conductivity between the peak segment and the ion standard solution is obtained;

[0029] The similarity in conductivity between the peak segment and the ion standard solution is negatively correlated with the conductivity difference between the peak segment and the ion standard solution.

[0030] Preferably, the similarity between the peak segment and the ion standard solution in terms of conductivity is obtained based on the similarity between the peak segment and the curve segment corresponding to the peak segment in the standard solution, and the similarity between the peak segment and the curve segment corresponding to the peak segment in the standard solution, and the specific method includes:

[0031] For any peak segment and any ion standard solution at any concentration, the ion standard solutions at all concentrations are recorded as target ion standard solutions, the sum of the similarities in conductivity between the peak segment and all target ion standard solutions is recorded as the overall similarity, the ratio of the similarity in conductivity between the peak segment and the ion standard solution to the overall similarity is recorded as the similarity contribution, and the product of the similarity contribution and the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment is taken as the similarity between the ion standard solution and the peak segment.

[0032] Preferably, the method of obtaining the content of each ion in the solution to be tested according to the similarity between each ion standard solution and the peak segment at each concentration and the concentration of each ion standard solution at each concentration includes the following specific methods:

[0033] For any ion, the product of the similarity between each peak segment and the standard solution of the ion at each concentration and the concentration of the standard solution of the ion at each concentration is used as the reference value of the standard solution of the ion at each concentration for each peak segment, and the sum of the reference values ​​of the standard solution of the ion at all concentrations for each peak segment is used as the concentration of the ion in the solution to be tested.

[0034] The beneficial effects of the technical solution of the present invention are as follows: the present invention obtains the content of magnetic substances in the test solution by obtaining the voltage-current curves of the test solution and all ion standard solutions at all concentrations, and by analyzing the similarity between the test solution and all standard solutions; intercepts the peak segment in the voltage-current curve of the test solution, obtains the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, and prepares data for the subsequent acquisition of the similarity between the test solution and the ion standard solution;

[0035] Further, the similarity between the peak segment and each ion standard solution in conductivity is obtained. Since the ion migration efficiency is always constant, the conductivity of the ion solution is stable. Therefore, the conductivity of the ion solution can be analyzed to understand the mutual influence between different ions and obtain the similarity between the solutions in conductivity, so as to avoid the mutual influence between different ions. Through the similarity between the solutions in conductivity, combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, the similarity between the solution to be tested and the ion standard solution is obtained, and based on this, the content of each ion in the solution to be tested is obtained, thereby accurately obtaining the content of magnetic substances in battery-grade lithium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flowchart of the steps of an intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate according to the present invention;

[0038] Figure 2 Schematic diagram of voltage-current curve of standard solution of iron ion at different concentrations;

[0039] Figure 3 Schematic diagram of voltage-current curve of cobalt ion standard solution at different concentrations;

[0040] Figure 4 Schematic diagram of the voltage-current curve of nickel ion standard solution at different concentrations;

[0041] Figure 5 Schematic diagram of the voltage-current curve of the solution to be tested. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the intelligent detection method of the content of magnetic substances in a battery-grade lithium carbonate proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0043] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0044] The specific scheme of the intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate provided by the present invention is described in detail below with reference to the accompanying drawings.

[0045] See also Figure 1 , which shows a flow chart of the steps of an intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate provided by one embodiment of the present invention, the method comprising the following steps:

[0046] Step S001: Obtain the voltage-current curves of the solution to be tested and all ion standard solutions at all concentrations.

[0047] It should be noted that battery-grade lithium carbonate is a key raw material for generating positive electrode materials for lithium-ion batteries, and its quality will directly affect the quality of the positive electrode of lithium-ion batteries. When the content of magnetic substances in battery-grade lithium carbonate is too high, the magnetic substances in the battery-grade lithium carbonate may react with the electrolyte, thereby reducing the service life of the lithium battery. Therefore, this embodiment proposes an intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate.

[0048] In one embodiment of the present invention:

[0049] An initial concentration β is preset, and a standard iron ion solution with a concentration of βbbp is prepared. A concentration iteration step γ and a concentration iteration number δ are preset, and several standard iron ion solutions with different concentrations are iteratively prepared; the specific values ​​of β, γ, and δ can be set by oneself according to the actual situation. This embodiment does not make a rigid requirement. In this embodiment, β=30, γ=10, and δ=22 are described;

[0050] Similarly, several cobalt ion standard solutions and nickel ion standard solutions of different concentrations are prepared; since the specific process of preparing the iron, cobalt and nickel ion standard solutions is a well-known prior art, it will not be described in detail in this embodiment;

[0051] The three-electrode method is used to measure the current of each standard solution at each voltage, and a rectangular coordinate system is constructed with voltage as the horizontal coordinate and current as the vertical coordinate to obtain the voltage-current curve of each standard solution, such as Figure 2 , Figure 3 , Figure 4 As shown, Figure 2 Schematic diagram of the voltage-current curve of the standard solution of iron ions at different concentrations. Figure 3 Schematic diagram of the voltage-current curve of cobalt ion standard solution at different concentrations. Figure 4 Schematic diagram of the voltage-current curve of nickel ion standard solution at different concentrations;

[0052] Furthermore, in a non-magnetic environment, a strong magnetic rod wrapped in plastic wrap is used to adsorb and enrich the magnetic foreign matter in lithium carbonate. The magnet wrapped in plastic wrap is placed in a container, and dilute sulfuric acid and dilute nitric acid are added thereto in turn, while heating and ultrasonic stirring; the solution is then centrifuged, and the solution is diluted with dilute nitric acid to a weakly acidic constant volume to obtain a sample solution. A platinum-carbon electrode is used as the working electrode, and 5 μL of the sample solution is evenly coated on the working electrode and allowed to air dry naturally. A platinum wire electrode is used as the counter electrode, and a saturated Ag / AgCl electrode is used as the reference electrode to form a three-electrode system, which is placed in an NH3-NH4Cl buffer solution and connected to an electrochemical workstation. The voltage-current curve of the solution to be tested is obtained, in which the horizontal axis is the voltage and the vertical axis is the current, as shown in FIG. Figure 5 As shown, Figure 5 Schematic diagram of the voltage-current curve of the solution to be tested.

[0053] It should be further explained that, due to the influence of the preparation process of battery-grade lithium carbonate, the magnetic substances in battery-grade lithium carbonate are three elements: iron, cobalt, and nickel. Therefore, this embodiment prepares standard solutions of iron, cobalt, and nickel ions at different concentrations, and obtains the contents of the three magnetic substances of iron, cobalt, and nickel in the solution to be tested by analyzing the similarity between the solution to be tested and all standard solutions.

[0054] At this point, the voltage-current curves of the solution to be tested and all ion standard solutions are obtained.

[0055] Step S002: intercept the peak segment in the voltage-current curve of the solution to be tested, and obtain the curve segment corresponding to the peak segment in the standard solution; according to the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution, obtain the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment.

[0056] It should be noted that, affected by the preparation process of battery-grade lithium carbonate, it can be known that the magnetic substances in battery-grade lithium carbonate are three elements: iron, cobalt, and nickel. Since the ion migration efficiency of different ions in the solution is different, there is a peak in the voltage-current curve of the ion standard solution, and there are three peaks in the test solution; therefore, before calculating the similarity between the test solution and all standard solutions, it is necessary to obtain the curve segment that can reflect the ion migration efficiency in the voltage-current curve of the test solution, and combine it with the corresponding curve segment in the ion standard solution to obtain the curve segment that can reflect the ion migration efficiency in the voltage-current curve of the test solution. The similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment is obtained through the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution.

[0057] Specifically, the three largest maximum points in the voltage-current curve of the solution to be tested are recorded as peak points, the minimum points adjacent to each peak point are recorded as the endpoints of each peak point; and the curve segment between the endpoints of the peak points is recorded as the peak segment;

[0058] For any ion standard solution voltage-current curve at any concentration and any peak segment, obtain the voltage range of the peak segment, and record the curve segment in the voltage-current curve segment of the standard solution that is located in the voltage range of the peak segment as the curve segment corresponding to the peak segment in the standard solution;

[0059] In a specific embodiment of the present invention:

[0060] For any peak segment and the curve segment corresponding to the peak segment in any ion standard solution at any concentration; the difference between the peak segment and the corresponding curve segment in the maximum amplitude is recorded as the first difference factor; the average of the differences between the peak segment and the amplitudes corresponding to all the same voltages in the corresponding curve segment is recorded as the second difference factor; the product of the first difference factor and the difference factor is recorded as the degree of difference between the corresponding curve segment and the peak segment, and the degree of similarity between the corresponding curve segment and the peak segment is obtained according to the degree of difference between the corresponding curve segment and the peak segment; the degree of difference between the corresponding curve segment and the peak segment is negatively correlated with the degree of similarity between the corresponding curve segment and the peak segment;

[0061] The specific calculation formula is:

[0062]

[0063] Where D i,k,u Indicates the similarity between the curve segment corresponding to the i-th peak segment in the u-th ion standard solution at the k-th concentration and the i-th peak segment; Q i represents the maximum amplitude in the i-th peak segment; Q i ' ,k,urepresents the maximum value of the curve segment corresponding to the i-th peak segment in the u-th ion standard solution at the k-th concentration; T i represents the number of data points in the i-th peak segment; q i,t represents the amplitude of the tth data point in the i-th peak segment; q i ' ,k,u,t represents the amplitude of the tth data point in the corresponding curve segment of the ith peak segment in the uth ion standard solution at the kth concentration; || represents absolute value operation; μ represents a preset hyperparameter, the purpose of which is to avoid the situation where the denominator is 0 during fractional operation. The specific value of μ can be set according to the actual situation. This embodiment does not make a rigid requirement. In this embodiment, μ=1 is used for description.

[0064] At this point, the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment is obtained.

[0065] Step S003: intercept the peak segment in the voltage-current curve of each ion standard solution at each concentration, and divide the peak segment into a left half peak segment and a right half peak segment; obtain the conductivity of the left half peak segment and the right half peak segment of each ion standard solution according to the distribution trend of the data points in the left half peak segment and the right half peak segment of the same ion standard solution at different concentrations; divide the peak segment into a left half peak segment and a right half peak segment; obtain the conductivity of the left half peak segment and the right half peak segment according to the change of the data points in the left half peak segment and the right half peak segment; obtain the similarity in conductivity between the peak segment and each ion standard solution according to the difference in conductivity between the left half peak segment and the left half peak segment, and between the right half peak segment and the right half peak segment.

[0066] It should be noted that Figure 2 , Figure 3 , Figure 4 It can be seen that even if the standard solution is not in the curve segment that can reflect the ion migration efficiency, the solution still has a certain conductivity. The similarity between the curve segment corresponding to the peak segment in the standard solution obtained in step S002 and the peak segment is obtained based on the difference in amplitude. In order to further accurately obtain the similarity between the test solution and all standard solutions, it is also necessary to combine the different ion migration efficiencies of different ions in the solution. Since the ion migration efficiency is always constant, the conductivity of the ion solution is stable. Therefore, the similarity between the solutions can be obtained by further analyzing the conductivity of the ion solution.

[0067] Specifically, for any ion standard solution at any concentration, the maximum maximum point in the voltage-current curve of the standard solution is recorded as the peak point, the minimum point adjacent to the peak point is recorded as the endpoint of the peak point, the curve segment between the endpoints of the peak point is taken as the peak segment, and the data point with the largest amplitude in the peak segment is taken as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment;

[0068] According to the distribution trend of data points in the left half peak section of the same ion standard solution at different concentrations, the conductivity of the left half peak section of the ion standard solution is obtained;

[0069] In one embodiment of the present invention, for any ion standard solution at any concentration, the ratio of the difference between the current value of the maximum point in the ion standard solution and the current value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, and the difference between the voltage value of the maximum point in the ion standard solution and the voltage value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, is recorded as the first conductivity factor of the standard solution; the average slope of all data points in the left half-wave peak segment of the ion standard solution is recorded as the second conductivity factor of the standard solution; the absolute value of the product of the first conductivity factor and the second conductivity factor of the standard solution is taken as the conductivity performance of the left half-wave peak segment of the ion standard solution;

[0070] The average value of the conductivity of all ion standard solutions of the same type at different concentrations is taken as the conductivity of the left half-wave peak of the ion standard solution;

[0071] The specific calculation formula is:

[0072]

[0073] Where W l ' ,u Indicates the conductivity of the left half-wave peak of the u-th ion standard solution; N u represents the number of standard solutions of the uth ion at all concentrations; c k,u represents the concentration of the u-th ion standard solution at the k-th concentration; I′ k,u,max V represents the current value of the maximum point in the peak segment of the u-th ion standard solution at the k-th concentration; k ' ,u,max Represents the voltage value of the maximum point in the peak segment of the u-th ion standard solution at the k-th concentration; I′ k,u,l,min V represents the current value corresponding to the data point with the smallest amplitude in the left half-wave peak of the u-th ion standard solution at the k-th concentration; k ' ,u,l,min It represents the voltage value corresponding to the data point with the smallest amplitude in the left half-wave peak segment of the u-th ion standard solution at the k-th concentration; It represents the mean slope of all data points in the left half peak of the u-th ion standard solution at the k-th concentration; || represents absolute value operation.

[0074] Similarly, according to the changes in data points in the right half peak segment of the same ion standard solution at different concentrations, the conductivity of the right half peak segment of the ion standard solution is obtained; the specific process of obtaining the conductivity of the right half peak segment of the ion standard solution is the same as that of obtaining the conductivity of the left half peak segment of the ion standard solution, so it will not be repeated in this embodiment.

[0075] Furthermore, corresponding to any peak segment, the data point with the largest amplitude in the peak segment is used as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment;

[0076] According to the change of the data points in the left half peak segment, the conductivity of the left half peak segment is obtained;

[0077] In one embodiment of the present invention, for any peak segment, the ratio of the difference between the current value of the maximum point in the peak segment and the current value corresponding to the data point with the smallest amplitude in the left half peak segment, and the difference between the voltage value of the maximum point in the peak segment and the voltage value corresponding to the data point with the smallest amplitude in the left half peak segment, is recorded as the first conductivity factor of the peak segment; the average slope of all data points in the left half peak segment is recorded as the second conductivity factor of the peak segment; the absolute value of the product of the first conductivity factor and the second conductivity factor of the peak segment is taken as the conductivity performance of the left half peak segment;

[0078] The specific calculation formula is:

[0079]

[0080] Where W l,i Indicates the conductivity of the i-th left half peak segment in the solution to be tested; I i,max Represents the current value of the maximum point in the i-th peak segment of the solution to be tested; V i,max I represents the voltage value of the maximum point in the i-th peak segment of the solution to be tested; i,l,min V represents the current value corresponding to the data point with the smallest amplitude in the i-th left half peak segment of the tested solution; i,l,min Indicates the voltage value corresponding to the data point with the smallest amplitude in the i-th left half peak segment of the tested solution; represents the mean slope of all data points in the i-th left half peak segment of the test solution; || represents absolute value operation.

[0081] Similarly, the conductivity of the right half peak segment is obtained based on the change of data points in the right half peak segment; the specific process of obtaining the conductivity of the right half peak segment is the same as that of obtaining the conductivity of the left half peak segment, so it will not be repeated in this embodiment.

[0082] It should be noted that for any solution, the stronger the conductivity of the solution, the lower the concentration of the solution, the smaller the voltage intensity, the greater the current it can conduct. The larger the value of is, the stronger the conductivity of the left half-wave peak of the u-th ion standard solution is. The larger the value of is, the stronger the conductivity of the i-th left half peak segment in the tested solution is.

[0083] It should be further explained that after obtaining the conductivity of the left and right half peak segments of each ion standard solution, and the conductivity of all left and right half peak segments in the solution to be tested, the similarity in conductivity between each peak segment and each ion standard solution can be obtained based on the difference in conductivity between the left half peak segment and the left peak segment of each ion standard solution, combined with the difference in conductivity between the right half peak segment and the right peak segment of each ion standard solution.

[0084] In one embodiment of the present invention, the difference in conductivity between the left half peak segment and the left half wave peak segment is recorded as the left half difference, and the difference in conductivity between the right half peak segment and the right half wave peak segment is recorded as the right half difference; the left half difference and the right half difference are recorded as the conductivity difference between the peak segment and the ion standard solution, and the difference in conductivity between the peak segment and the ion standard solution is obtained according to the conductivity difference between the peak segment and the ion standard solution, and the similarity in conductivity between the peak segment and the ion standard solution is obtained;

[0085] The similarity in conductivity between the peak segment and the ion standard solution is negatively correlated with the conductivity difference between the peak segment and the ion standard solution;

[0086] The specific calculation formula is:

[0087] E i,u =exp[-(|W′ l,u -W l,i |+|W′ r,u -W r,i |)]

[0088] In the formula, E i,u Indicates the similarity in conductivity between the i-th peak segment in the test solution and the u-th ion standard solution; W′ l,u W represents the conductivity of the left half-wave peak of the u-th ion standard solution; l,i Indicates the conductivity of the i-th left half peak segment in the solution to be tested; W′ r,u W represents the conductivity of the right half-wave peak of the u-th ion standard solution; r,irepresents the conductivity of the i-th right half peak segment in the solution to be tested; || represents absolute value operation; exp[] represents an exponential function with a natural constant as the base. In this embodiment, the exp[-x] model is used to present the inverse proportional relationship and normalization processing, and x is the input of the model. The implementer can set the inverse proportional function and normalization function according to the actual situation.

[0089] It should be noted that, corresponding to any ion standard solution, the smaller the difference in conductivity between the left half peak segment and the left half peak segment, and the smaller the difference in conductivity between the right half peak segment and the right half peak segment, the more similar the peak segment and the peak segment are in conductivity, that is, the more similar the peak segment is to the standard solution in conductivity.

[0090] At this point, the similarity in conductivity between each peak segment in the test solution and each standard solution is obtained.

[0091] Step S004: According to the similarity between the peak segment and the ion standard solution in conductivity, combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, the similarity between each ion standard solution and the peak segment at each concentration is obtained; according to the similarity between each ion standard solution and the peak segment at each concentration, combined with the concentration of each ion standard solution at each concentration, the content of each in the solution to be tested is obtained, and the content of magnetic substances in battery-grade lithium carbonate is obtained.

[0092] It should be noted that, by respectively obtaining the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment and the similarity in conductivity between each peak segment in the solution to be tested and each standard solution through steps S002 and S003, the similarity between each ion standard solution and the peak segment at each concentration can be further obtained. The more similar the peak segment is to a certain ion standard solution at a certain concentration, the closer the ion content in the solution to be tested is to the content of the ion standard solution at the concentration. Then, the magnetic substance content in battery-grade lithium carbonate can be accurately obtained through the similarity between each ion standard solution and the peak segment at each concentration, combined with the concentration of each ion standard solution at each concentration and the content of each ion in the solution to be tested.

[0093] Specifically, for any peak segment, according to the similarity between the peak segment and all ion standard solutions in terms of conductivity, combined with the similarity between the curve segment corresponding to the peak segment in each ion standard solution at each concentration and the peak segment, the similarity between each ion standard solution at each concentration and the peak segment is obtained;

[0094] In one embodiment of the present invention, for any peak segment and any ion standard solution at any concentration, the ion standard solution at all concentrations is recorded as the target ion standard solution, the sum of the similarities in conductivity between the peak segment and all target ion standard solutions is recorded as the overall similarity, the ratio of the similarity in conductivity between the peak segment and the ion standard solution and the overall similarity is recorded as the similarity contribution, and the product of the similarity contribution and the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment is used as the similarity between the ion standard solution and the peak segment;

[0095] The specific calculation formula is:

[0096]

[0097] In the formula, Z i,k,u Indicates the similarity between the i-th peak segment in the test solution and the u-th ion standard solution at the k-th concentration; E i,u Indicates the similarity in conductivity between the i-th peak segment in the test solution and the u-th ion standard solution; E i,v represents the similarity in conductivity between the i-th peak segment in the test solution and the v-th ion standard solution; M represents the number of all ion standard solutions; D i,k,u It indicates the similarity between the curve segment corresponding to the i-th peak segment in the u-th ion standard solution at the k-th concentration and the i-th peak segment.

[0098] Further, according to the similarity between each ion standard solution and the peak segment at each concentration, combined with the concentration of each ion standard solution at each concentration, the content of each ion in the solution to be tested is obtained;

[0099] In one embodiment of the present invention, for any ion, the product of the similarity between each peak segment and the standard solution of the ion at each concentration and the concentration of the standard solution of the ion at each concentration is used as the reference value of the standard solution of the ion at each concentration for each peak segment, and the sum of the reference values ​​of the standard solution of the ion at all concentrations for each peak segment is used as the concentration of the ion in the solution to be tested;

[0100] The specific calculation formula is:

[0101]

[0102] In the formula, H u Indicates the concentration of the u-th ion in the solution to be tested; Z i,k,u Indicates the similarity between the i-th peak segment in the test solution and the u-th ion standard solution at the k-th concentration; c k,urepresents the concentration of the u-th ion standard solution at the k-th concentration; R represents the number of peak segments in the solution to be tested; Y represents the number of concentrations in the ion standard solution at all concentrations.

[0103] According to the concentration of each ion in the solution to be tested and the mass of the solution to be tested, the content of each magnetic substance in the battery-grade lithium carbonate can be accurately obtained.

[0104] It should be noted that this embodiment accurately obtains the similarity between the solution to be tested and the ion standard solution through the similarity between the solutions and the similarity between the curve segment corresponding to the peak segment in the standard solution, and obtains the content of each ion in the solution to be tested on this basis, thereby accurately obtaining the content of magnetic substances in battery-grade lithium carbonate.

[0105] At this point, this embodiment is completed.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent detection method for the content of magnetic substances in battery-grade lithium carbonate, characterized in that: The method comprises the following steps: Obtain the voltage-current curves of the test solution and all ion standard solutions at all concentrations; Intercepting the peak segment in the voltage-current curve of the solution to be tested, and obtaining the curve segment corresponding to the peak segment in the standard solution; obtaining the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment according to the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution; The peak segment in the voltage-current curve of each ion standard solution at each concentration is intercepted, and the peak segment is divided into a left half peak segment and a right half peak segment; according to the distribution trend of the data points in the left half peak segment and the right half peak segment of the same ion standard solution at different concentrations, the conductivity of the left half peak segment and the right half peak segment of each ion standard solution is obtained; The peak segment is divided into a left half peak segment and a right half peak segment; according to the changes of the data points in the left half peak segment and the right half peak segment, the conductivity of the left half peak segment and the right half peak segment is obtained; according to the difference in conductivity between the left half peak segment and the left half peak segment, and the right half peak segment and the right half peak segment, the similarity in conductivity between the peak segment and each ion standard solution is obtained; According to the similarity between the peak segment and the ion standard solution in terms of conductivity, combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment, the similarity between each ion standard solution and the peak segment at each concentration is obtained; according to the similarity between each ion standard solution and the peak segment at each concentration, combined with the concentration of each ion standard solution at each concentration, the content of each ion in the solution to be tested is obtained, and the content of magnetic substances in battery-grade lithium carbonate is obtained; The method of obtaining the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment according to the difference in amplitude between the peak segment and the curve segment corresponding to the peak segment in the standard solution includes: For any peak segment and the curve segment corresponding to the peak segment in any ion standard solution at any concentration; the difference between the peak segment and the corresponding curve segment in the maximum amplitude is recorded as the first difference factor; the average of the differences between the peak segment and the amplitudes corresponding to all the same voltages in the corresponding curve segment is recorded as the second difference factor; the product of the first difference factor and the difference factor is recorded as the degree of difference between the corresponding curve segment and the peak segment, and the degree of similarity between the corresponding curve segment and the peak segment is obtained according to the degree of difference between the corresponding curve segment and the peak segment; the degree of difference between the corresponding curve segment and the peak segment is negatively correlated with the degree of similarity between the corresponding curve segment and the peak segment; The method of obtaining the similarity of the peak segment with each ion standard solution in terms of conductivity based on the difference in conductivity between the left half wave peak segment and the left half peak segment, and between the right half wave peak segment and the right half peak segment, includes the following specific methods: The difference in conductivity between the left half peak segment and the left half wave peak segment is recorded as the left half difference, and the difference in conductivity between the right half peak segment and the right half wave peak segment is recorded as the right half difference; the left half difference and the right half difference are recorded as the conductivity difference between the peak segment and the ion standard solution, and the difference in conductivity between the peak segment and the ion standard solution is obtained based on the conductivity difference between the peak segment and the ion standard solution, and the similarity in conductivity between the peak segment and the ion standard solution is obtained; The similarity in conductivity between the peak segment and the ion standard solution is negatively correlated with the conductivity difference between the peak segment and the ion standard solution; The similarity between the peak segment and the ion standard solution in terms of conductivity is combined with the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment to obtain the similarity between each ion standard solution and the peak segment at each concentration, including the specific method of: For any peak segment and any ion standard solution at any concentration, the ion standard solutions at all concentrations are recorded as target ion standard solutions, the sum of the similarities in conductivity between the peak segment and all target ion standard solutions is recorded as the overall similarity, the ratio of the similarity in conductivity between the peak segment and the ion standard solution and the overall similarity is recorded as the similarity contribution, and the product of the similarity contribution and the similarity between the curve segment corresponding to the peak segment in the standard solution and the peak segment is taken as the similarity between the ion standard solution and the peak segment; The method of obtaining the content of each ion in the solution to be tested according to the similarity between each ion standard solution and the peak segment at each concentration and the concentration of each ion standard solution at each concentration includes the following specific methods: For any ion, the product of the similarity between each peak segment and the standard solution of the ion at each concentration and the concentration of the standard solution of the ion at each concentration is used as the reference value of the standard solution of the ion at each concentration for each peak segment, and the sum of the reference values ​​of the standard solution of the ion at all concentrations for each peak segment is used as the concentration of the ion in the solution to be tested; The method of intercepting the peak segment in the voltage-current curve of the solution to be tested and obtaining the curve segment corresponding to the peak segment in the standard solution includes the following specific methods: The three largest maximum points in the voltage-current curve of the solution to be tested are recorded as peak points, and the minimum points adjacent to each peak point are recorded as the endpoints of each peak point; the curve segment between the endpoints of the peak points is recorded as the peak segment; For any ion standard solution voltage-current curve at any concentration and any peak segment, obtain the voltage range of the peak segment, and record the curve segment in the voltage-current curve segment of the standard solution that is located in the voltage range of the peak segment as the curve segment corresponding to the peak segment in the standard solution; The method of intercepting the peak segment in the voltage-current curve of each ion standard solution at each concentration and dividing the peak segment into a left half peak segment and a right half peak segment includes: For any ion standard solution at any concentration, the maximum maximum point in the voltage-current curve of the standard solution is recorded as the peak point, the minimum point adjacent to the peak point is recorded as the end point of the peak point, the curve segment between the end points of the peak point is recorded as the peak segment, and the data point with the largest amplitude in the peak segment is used as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment; The specific method of obtaining the conductivity of the left half peak segment and the right half peak segment of each ion standard solution according to the distribution trend of the data points in the left half peak segment and the right half peak segment of the same ion standard solution at different concentrations includes: For any ion standard solution at any concentration, the ratio of the difference between the current value of the maximum point in the ion standard solution and the current value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, and the difference between the voltage value of the maximum point in the ion standard solution and the voltage value corresponding to the data point with the smallest amplitude in the left half-wave peak segment, is recorded as the first conductivity factor of the standard solution; the average slope of all data points in the left half-wave peak segment of the ion standard solution is recorded as the second conductivity factor of the standard solution; the absolute value of the product of the first conductivity factor and the second conductivity factor of the standard solution is taken as the conductivity performance of the left half-wave peak segment of the ion standard solution; The average value of the conductivity of all ion standard solutions of the same type at different concentrations is taken as the conductivity of the left half-wave peak of the ion standard solution; Similarly, the conductivity of the right half-wave peak of the ion standard solution is obtained; The specific method of dividing the peak segment into a left half peak segment and a right half peak segment is as follows: Corresponding to any peak segment, the data point with the largest amplitude in the peak segment is used as the segmentation point of the peak segment to obtain the left half peak segment and the right half peak segment; The specific method of obtaining the conductive properties of the left half peak segment and the right half peak segment according to the changes of the data points in the left half peak segment and the right half peak segment is as follows: For any peak segment, the ratio of the difference between the current value of the maximum point in the peak segment and the current value corresponding to the data point with the smallest amplitude in the left half peak segment, and the difference between the voltage value of the maximum point in the peak segment and the voltage value corresponding to the data point with the smallest amplitude in the left half peak segment, is recorded as the first conductivity factor of the peak segment; the average slope of all data points in the left half peak segment is recorded as the second conductivity factor of the peak segment; the absolute value of the product of the first conductivity factor and the second conductivity factor of the peak segment is taken as the conductivity performance of the left half peak segment; Similarly, the conductivity of the right half peak segment is obtained.

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