Method, device and equipment for detecting mixed powder and storage medium

Abstract

The invention discloses a detection method, device and equipment of mixed powder and a storage medium, and belongs to the technical field of battery preparation. The method comprises the following steps: obtaining the theoretical true density of mixed powder, wherein the mixed powder is a powder material for preparing a battery; obtaining the measured true density of sample powder sampled from the mixed powder, wherein the measured true density is the measured value of the true density of the sample powder; on the basis of the density difference between the theoretical true density and the measured true density, indicating the mixing uniformity of the mixed powder; the mixing uniformity of the mixed powder is in negative correlation with the absolute value of the density difference. The mixing uniformity of the mixed powder is indicated through the density difference between the theoretical true density and the measured true density; the theoretical true density is fully utilized as the stability of the physical properties of the powder, and the mixing uniformity of the sample powder is indicated.

Description

Technical Field

[0001] The present application relates to the field of battery preparation technology, and in particular to a detection method, device, equipment and storage medium for mixed powder. Background Art

[0002] Before preparing the battery, it is necessary to mix the powders of the positive and negative electrode materials and the conductive agent. In order to ensure the consistency of the prepared battery, the powders need to be evenly mixed.

[0003] In the related art, slurry is used to mix various powders, and the uniformity of the mixed powders can be characterized by parameters such as the fineness and viscosity of the slurry after mixing.

[0004] However, the parameters of slurry fineness and viscosity are not applicable to the scenario of direct mixing between powders, and a solution for detecting the mixing uniformity of mixed powders is needed. Summary of the invention

[0005] The present application provides a method, device, equipment and storage medium for detecting mixed powders, and the technical solution is as follows:

[0006] According to one aspect of the present application, a method for detecting a mixed powder is provided, the method comprising:

[0007] Obtaining a theoretical true density of a mixed powder, wherein the mixed powder is a powder material for preparing a battery;

[0008] Obtaining a measured true density of a sample powder sampled from the mixed powder, wherein the measured true density is a measured value of the true density of the sample powder;

[0009] Based on the density difference between the theoretical true density and the measured true density, the mixing uniformity of the mixed powder is indicated; and there is a negative correlation between the mixing uniformity of the mixed powder and the absolute value of the density difference.

[0010] According to another aspect of the present application, a mixed powder detection device is provided, the device comprising:

[0011] An acquisition module, used to acquire the theoretical true density of a mixed powder, where the mixed powder is a powder material used to prepare a battery;

[0012] The acquisition module is further used to acquire the measured true density of the sample powder sampled from the mixed powder, wherein the measured true density is a measured value of the true density of the sample powder;

[0013] A processing module is used to indicate the mixing uniformity of the mixed powder based on the density difference between the theoretical true density and the measured true density; there is a negative correlation between the mixing uniformity of the mixed powder and the absolute value of the density difference.

[0014] In an optional design of the present application, the acquisition module is further used for:

[0015] Obtaining the powder true density of at least two component powders in the mixed powder;

[0016] The processing module is also used for:

[0017] Calculating the component dispersion coefficient between the powder true densities of the at least two component powders;

[0018] Determining a first correction parameter according to the component dispersion coefficient, wherein the component dispersion coefficient and the first correction parameter are positively correlated;

[0019] The difference between the density difference and the first correction parameter is calculated to obtain a corrected density difference, and the corrected density difference is used to indicate the mixing uniformity of the mixed powder.

[0020] In an optional design of the present application, the processing module is further used for:

[0021] The sampling position of the sample powder is determined according to the first correction parameter; as the first correction parameter increases, the distance between the sampling position and the edge position of the mixed powder increases.

[0022] In an optional design of the present application, the number of the sample powders is at least four, and the at least four sample powders correspond one-to-one to the at least four sampling positions in the mixed powder; the acquisition module is further used for:

[0023] Acquiring the at least four sampling positions in the mixed powder;

[0024] The processing module is also used for:

[0025] Determine a segregation position set from the at least four sampling positions according to measured true densities of at least four sample powders, wherein the segregation position set includes at least three segregation positions, and the at least three segregation positions are used to indicate at least one connected domain;

[0026] Determine a second correction parameter according to spatial information of the at least one connected domain, wherein the spatial information and the second correction parameter are positively correlated, and the spatial information is used to indicate a region area or a spatial volume of the at least one connected domain;

[0027] Calculating the sum of the density difference and the second correction parameter corresponding to at least four sample powders respectively to obtain a corrected density difference, wherein the corrected density difference is used to indicate the mixing uniformity of the mixed powder;

[0028] The density difference between the measured true density and the theoretical true density corresponding to the separation position exceeds a difference threshold.

[0029] In an optional design of the present application, the device further includes:

[0030] The display module is used to display prompt information, where the prompt information is used to indicate the position of the at least one connected domain in the mixed powder.

[0031] In an optional design of the present application, the processing module is further used for:

[0032] Determining supplementary control information according to the spatial information of the at least one connected domain;

[0033] Among them, the supplementary control information is control information of a mixing device that performs supplementary mixing on the mixed powder; the supplementary control information is used to instruct the stirring part of the mixing device to move through the at least one connected domain, and / or when the mixing device drives the mixed powder to move, relative movement occurs between the powders in the at least one connected domain.

[0034] According to another aspect of the present application, a computer device is provided, comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the mixed powder detection method as described above.

[0035] According to another aspect of the present application, a computer-readable storage medium is provided, wherein at least one instruction, at least one program, a code set or an instruction set is stored in the computer-readable storage medium, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the mixed powder detection method as described above.

[0036] According to another aspect of the present application, a computer program product is provided, which includes computer instructions stored in a computer-readable storage medium, and a processor reads and executes the computer instructions from the computer-readable storage medium to implement the mixed powder detection method described above.

[0037] The beneficial effects of the technical solution provided by this application include at least:

[0038] The density difference between the theoretical true density and the measured true density can be used to indicate the mixing uniformity of the mixed powder. The stability of the theoretical true density as a physical property of the powder is fully utilized to indicate the mixing uniformity of the sample powder, and the mixing uniformity of the entire mixed powder is characterized based on the mixing uniformity of the sample powder. The theoretical true density of the mixed powder and the measured true density of the sample powder are the actual masses of the mixed powder and sample powder per unit volume in an absolutely dense state, and both exclude the influence of the pores inside the powder or the gaps between the powder particles on the density. The density difference can accurately indicate the mixing uniformity of the mixed powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 is a schematic diagram of a computer system provided by an exemplary embodiment of the present application;

[0041] Figure 2 is a schematic diagram of a mixed powder detection method provided by an exemplary embodiment of the present application;

[0042] Figure 3 is a flow chart of a method for detecting mixed powders provided by an exemplary embodiment of the present application;

[0043] Figure 4 is a flow chart of a method for detecting mixed powders provided by an exemplary embodiment of the present application;

[0044] Figure 5 is a flow chart of a method for detecting mixed powders provided by an exemplary embodiment of the present application;

[0045] Figure 6 is a schematic diagram of powder true density, theoretical true density and measured true density provided by an exemplary embodiment of the present application;

[0046] Figure 7 is a schematic diagram of a discrete coefficient provided by an exemplary embodiment of the present application;

[0047] Figure 8 is a flow chart of a method for detecting mixed powders provided by an exemplary embodiment of the present application;

[0048] Fig. 9 is a flow chart of a method for detecting mixed powders provided by an exemplary embodiment of the present application;

[0049] Fig.10 is a structural block diagram of a mixed powder detection device provided by an exemplary embodiment of the present application;

[0050] Fig.11 It is a structural block diagram of a server provided by an exemplary embodiment of the present application.

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0054] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0055] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions. For example, the theoretical true density, measured true density, mixing ratio of component powders and other information involved in this application are all obtained with full authorization.

[0056] It should be understood that although the terms first, second, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first parameter may also be referred to as the second parameter, and similarly, the second parameter may also be referred to as the first parameter. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0057] Figure 1 A schematic diagram of a computer system provided by an embodiment of the present application is shown. The computer system can be implemented as a system architecture of a mixed powder detection method. The computer system may include: a terminal 100 and a server 200.

[0058] The terminal 100 may be an electronic device such as a mobile phone, a tablet computer, a PC (Personal Computer), etc. A client for running a target application may be installed in the terminal 100. The target application may be a production management application that provides a mixed powder detection function, or other applications that provide a mixed powder detection function, which is not limited in this application. In addition, this application does not limit the form of the target application, including but not limited to App (Application) installed in the terminal 100, applets, etc., and may also be in the form of a web page.

[0059] The server 200 may be an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The server 200 may be a background server of the target application, used to provide background services for the client of the target application.

[0060] In the mixed powder detection method provided in the embodiment of the present application, the execution subject of each step may be a computer device, which refers to an electronic device with data calculation, processing and storage capabilities. Figure 1 Taking the implementation environment of the scheme shown as an example, the mixed powder detection method can be executed by the terminal 100 (such as the client of the target application installed and running in the terminal 100 executes the mixed powder detection method), or the mixed powder detection method can be executed by the server 200, or the terminal 100 and the server 200 can interact and cooperate to execute it, and this application does not limit this.

[0061] In addition, the technical solution of the present application can be combined with blockchain technology. For example, the detection method of mixed powder disclosed in the present application, some data involved (such as the theory of mixed powder, measured true density, sampling location and other data) can be stored on the blockchain. The terminal 100 and the server 200 can communicate through a network, such as a wired or wireless network.

[0062] Exemplarily, the computer device and the measuring device are also connected via a network, and the measuring device includes but is not limited to a true density measuring device used by a measuring person, or a true density measuring device 260 installed on a battery production line. The measuring device is used to measure the measured true density of the sample powder, and uploads the measured true density to the computer device via the network.

[0063] Figure 2 A schematic diagram of a mixed powder detection method provided by an exemplary embodiment of the present application is shown.

[0064] The mixed powder 310 is obtained by mixing the ternary material 302 and the conductive carbon black 304; the ternary material 302 and the conductive carbon black 304 are component powders in the mixed powder 310; the mixing ratio 322 of the ternary material 302 and the conductive carbon black 304 is obtained, and the mixing ratio 322 is obtained by mixing the ternary material and the conductive carbon black at a weight ratio of 97:1; the powder true density 324 of the ternary material 302 and the conductive carbon black 304 is obtained; wherein the powder true density of the ternary material is: 4.728 g / cm 3 , The true density of conductive carbon black powder is: 1.8702g / cm 3 .

[0065] A weighted average is calculated based on the mixing ratio 322 and the true density 324 of each component powder, for example, the true density of at least two component powders is calculated based on the weighted average of the mixing ratio; and a theoretical true density 326 is calculated.

[0066] For example, the theoretical true density 326 of the mixed powder 310 is: 97 / (97+1)*4.728+1 / (97+1)*1.8702=4.6988 g / cm 3 Since the value of the mixed theoretical true density 326 of the ternary material 302 and the conductive carbon black 304 is between the maximum and minimum values ​​of the true density of the component powders, it can be understood that in this embodiment, the mixing of the ternary material 302 and the conductive carbon black 304 is used as an example for explanation, and other component powders can be mixed in different implementations, and the number of component powders can be realized as more.

[0067] A sample powder 312 is obtained from the mixed powder 310, and the true density of the sample powder 312 is measured to obtain a measured true density 328. Exemplarily, the measured true density can be measured based on at least one of a gas volume method and an immersion method, excluding the increase in powder volume caused by the pores inside the powder or the gaps between the powder particles, which in turn affects the density.

[0068] The difference between the theoretical true density 326 and the measured true density 328 is calculated to obtain the density difference 332. The density difference indicates the mixing uniformity of the mixed powder; as the absolute value of the density difference increases, the mixing uniformity of the mixed powder decreases, and the distribution of each component powder in the mixed powder becomes more uneven.

[0069] The density difference between the theoretical true density and the measured true density can be used to indicate the mixing uniformity of the mixed powder. The stability of the theoretical true density as a physical property of the powder is fully utilized to indicate the mixing uniformity of the sample powder, and the mixing uniformity of the entire mixed powder is characterized based on the mixing uniformity of the sample powder. The theoretical true density of the mixed powder and the measured true density of the sample powder are the actual masses of the mixed powder and sample powder per unit volume in an absolutely dense state, and both exclude the influence of the pores inside the powder or the gaps between the powder particles on the density. The density difference can accurately indicate the mixing uniformity of the mixed powder.

[0070] Next, the detection method of the mixed powder will be introduced through the following examples.

[0071] Figure 3 A flow chart of a mixed powder detection method provided by an exemplary embodiment of the present application is shown. The method can be executed by a computer device. The method includes:

[0072] Step 510: Obtaining the theoretical true density of the mixed powder;

[0073] For example, the theoretical true density is an inherent property of the mixed powder, which is the actual mass of the mixed powder per unit volume in an absolutely dense state, that is, the density after removing the internal pores or gaps between particles. The theoretical true density is a material physical parameter of the mixed powder. For example, the value of the theoretical true density of the mixed powder is determined by the chemical composition and purity of the material.

[0074] Exemplarily, the mixed powder is a powder material for preparing a battery; the mixed powder can be used as an electrode in a battery and / or as a conductive material between electrodes. Exemplarily, the mixed powder is subjected to at least one of coating, drying, calendering and other process treatments to form a uniform electrode sheet, thereby achieving the preparation of a battery.

[0075] Exemplarily, the mixed powder is obtained by mixing at least two component powders; exemplary, the mixed powder can be obtained by manually stirring and mixing at least two component powders, or by using a stirring device, a shaking device, etc.

[0076] Step 520: obtaining the measured true density of the sample powder sampled from the mixed powder;

[0077] Exemplarily, the sample powder is sampled from the mixed powder, and the measured true density of the sample powder is used to characterize the true density of the mixed powder as a whole. Exemplarily, the sample powder can be sampled at one or more positions such as the center position, edge problem, etc. of the mixed powder. The present application does not limit at least one of the sampling position, sampling quantity, and sampling weight of the sample powder.

[0078] Exemplarily, the measured true density is the actual measured value of the true density of the sample powder; Exemplarily, the measured true density is the density after excluding the internal pores or gaps between particles in the sample powder. Exemplarily, the measured true density can be obtained based on the gas volume method, such as using an inert gas to replace the volume occupied by the air inside the sample powder, and the measured volume of the sample powder is close to the real volume, so as to measure the true density of the sample powder. Exemplarily, the measured true density can be obtained based on the immersion method, such as using an immersion liquid that wets but does not dissolve the sample powder to replace the air inside the sample powder, and the measured volume of the sample powder is close to the real volume, so as to measure the true density of the sample powder.

[0079] Step 530: indicating the mixing uniformity of the mixed powder based on the density difference between the theoretical true density and the measured true density;

[0080] For example, the mixed powder may have individual component powders that are not mixed evenly, resulting in a difference between the theoretical true density of the mixed powder and the measured true density of the sample powder.

[0081] Exemplarily, the density difference between the theoretical true density and the measured true density can be the value of the theoretical true density minus the measured true density, or the value of the measured true density minus the theoretical true density; the density difference can be a positive value or a negative value, and there is no restriction on the value of the density difference.

[0082] For example, the mixing uniformity of the mixed powder is indicated based on the density difference; as the absolute value of the density difference increases, the mixing uniformity of the mixed powder decreases, and the distribution of each component powder in the mixed powder becomes more uneven. In other words, there is a negative correlation between the mixing uniformity of the mixed powder and the absolute value of the density difference.

[0083] In summary, the method provided in this embodiment indicates the mixing uniformity of the mixed powder through the density difference between the theoretical true density and the measured true density; fully utilizes the stability of the theoretical true density as a physical property of the powder to indicate the mixing uniformity of the sample powder, and characterizes the mixing uniformity of the mixed powder as a whole based on the mixing uniformity of the sample powder; the theoretical true density of the mixed powder and the measured true density of the sample powder are the actual masses of the mixed powder and the sample powder per unit volume in an absolutely dense state, and both exclude the influence of the pores inside the powder or the gaps between the powder particles on the density, and the density difference can accurately indicate the mixing uniformity of the mixed powder.

[0084] Figure 4 A flow chart of a method for detecting mixed powder provided by an exemplary embodiment of the present application is shown. The method can be executed by a computer device. Figure 3 In the illustrated embodiment, step 510 may be implemented as steps 512, 514, and 516:

[0085] Step 512: obtaining a mixing ratio of at least two component powders in the mixed powder;

[0086] As introduced above, the mixed powder is obtained by mixing at least two component powders; the mixing ratio of at least two component powders is the preparation information of the mixed powder; in an example, the mixed powder is a mixture of ternary material and conductive carbon black in a weight ratio of 97:1, and the mixing ratio of at least two component powders is 97:1.

[0087] In an optional implementation of the present application, the mixed powder is obtained by mixing at least two component powders, and the at least two component powders include battery positive and negative electrode materials and a conductive agent;

[0088] Among them, the positive and negative electrode materials of the battery include at least one of graphite material, lithium iron phosphate (LiFePO4) material, and ternary material; illustratively, graphite is an allotrope of elemental carbon with a layered structure, each layer of carbon atoms is covalently bonded, and there are van der Waals forces between layers. Lithium iron phosphate is a lithium-ion battery electrode material with the characteristics of high energy density, good safety, long life and excellent charging performance. Ternary material usually refers to a ternary positive electrode material using lithium nickel cobalt manganese oxide (Li(NiCoMn)O2) or lithium nickel cobalt aluminum oxide as the positive electrode material; ternary materials are safer than lithium cobalt oxide batteries, but have lower voltage.

[0089] Exemplarily, the conductive agent includes at least one of conductive carbon black, Ketjen Black, carbon nanotubes, and gas-grown carbon fiber. Exemplarily, conductive carbon black is a carbon black with low resistance or high resistance properties, which can give the product conductive or antistatic effects. Ketjen Black is a high-efficiency, high-purity carbon black used in lithium batteries, which can achieve high conductivity with a low addition amount. Carbon nanotubes are tubular structures composed of carbon atoms and can be realized as single-walled carbon nanotubes and multi-walled carbon nanotubes. Gas-grown carbon fiber, also known as chemical vapor deposition carbon fiber, is a carbon fiber grown by pyrolysis and deposition of a mixed gas at high temperature on catalyst particles.

[0090] Step 514: obtaining the powder true density of at least two component powders;

[0091] Exemplarily, the mixed powder is obtained by mixing at least two component powders; the names of at least two component powders in the mixed powder are the preparation information of the mixed powder; exemplary, the true density of the at least two component powders is obtained by querying based on the names of the component powders.

[0092] Step 516: Calculate the powder true density of at least two component powders, and obtain the theoretical true density of the mixed powder based on the weighted average of the mixing ratio;

[0093] Exemplarily, based on the mixing ratio, the powder true densities of the component powders are weighted to obtain the weighted powder true density, and the sum of the weighted powder true densities of the component powders is the theoretical true density of the mixed powder.

[0094] Exemplarily, the sum of the weighted coefficients of each component powder based on the mixing ratio is equal to 1. In one example, taking the mixing of the ternary material and the conductive carbon black at a weight ratio of 97:1 as an example, the weighted coefficient of the ternary material is 97 / (97+1), and the weighted coefficient of the conductive carbon black is 1 / (97+1).

[0095] For example, the powder true density of the obtained ternary material is 4.728 g / cm 3 , the true density of conductive carbon black powder is 1.8702g / cm 3 ; The theoretical true density of the mixed powder is calculated as: 97 / (97+1)*4.728+1 / (97+1)*1.8702=4.6988g / cm 3 .

[0096] In summary, the method provided in this embodiment indicates the mixing uniformity of the mixed powder by the density difference between the theoretical true density and the measured true density; makes full use of the stability of the theoretical true density as a physical property of the powder to indicate the mixing uniformity of the sample powder, and characterizes the mixing uniformity of the mixed powder as a whole based on the mixing uniformity of the sample powder; the theoretical true density is the average of the powder true densities of at least two component powders weighted according to the mixing ratio, and utilizes the stability of the physical properties of the powder and the powder true density of the component powder of a single component that is easy to obtain to calculate the theoretical true density of the mixed powder, thereby reducing the complexity of obtaining the theoretical true density, avoiding the need to measure the true density of the mixed powder as a whole, and improving the efficiency of the mixed powder detection; the theoretical true density of the mixed powder and the measured true density of the sample powder are the actual mass of the mixed powder and the sample powder per unit volume in an absolutely dense state, both of which exclude the influence of the pores inside the powder or the gaps between the powder particles on the density, and the density difference can accurately represent the mixing uniformity of the mixed powder.

[0097] Figure 5 A flow chart of a method for detecting mixed powder provided by an exemplary embodiment of the present application is shown. The method can be executed by a computer device. Figure 3 In the illustrated embodiment, step 520 may be implemented as step 522, and step 530 may be implemented as step 532 and step 534:

[0098] Step 522: obtaining measured true densities of at least two sample powders sampled from the mixed powder;

[0099] In one implementation of the present application, the number of sample powders sampled in the mixed powder is at least two, and the at least two sample powders correspond one-to-one to at least two sampling positions in the mixed powder; that is, different sample powders are sampled at different positions in the mixed powder.

[0100] Step 532: Calculate the difference between the measured true density and the theoretical true density of at least two sample powders respectively, and obtain the density difference of at least two sample powders in one-to-one correspondence;

[0101] Exemplarily, each of the at least two sample powders has a corresponding density difference. Exemplarily, the density difference can be a value obtained by subtracting the measured true density from the theoretical true density, or a value obtained by subtracting the measured true density from the theoretical true density. The density differences of the at least two sample powders corresponding to each other are obtained by calculating the difference using the same calculation method.

[0102] Step 534: Calculate the density dispersion coefficient between the density differences of at least two sample powders in one-to-one correspondence;

[0103] For example, the density dispersion coefficient (CV), also known as the density variation coefficient, is a statistic of the dispersion degree between the density differences of at least two sample powders corresponding to each other. For example, as the density dispersion coefficient increases, the dispersion degree between the density differences also increases.

[0104] In this embodiment, the density dispersion coefficient is used to indicate the mixing uniformity of the mixed powder, and there is a negative correlation between the mixing uniformity of the mixed powder and the density dispersion coefficient. As the density dispersion coefficient increases, the density difference of the sample powders at different sampling positions is obvious, and the mixing uniformity of the mixed powder decreases.

[0105] Exemplarily, the density dispersion coefficient is the ratio between the density standard deviation and the density average value, wherein the density standard deviation is used to indicate the standard deviation between the density differences of at least two sample powders corresponding to each other, and the density average value is used to indicate the average value between the density differences of at least two sample powders corresponding to each other.

[0106] In one example, the ternary material and the conductive carbon black are mixed in a weight ratio of 97:1; as described above, the powder true density of the ternary material obtained is 4.728 g / cm 3 , the true density of conductive carbon black powder is 1.8702g / cm 3 The calculated theoretical true density of the mixed powder is 4.6988 g / cm 3 .

[0107] Figure 6 A schematic diagram of the true density, theoretical true density and measured true density of a powder provided by an exemplary embodiment of the present application is shown. The true density of the powder of the ternary material is measured 6 times before mixing the ternary material and the conductive carbon black. The measured true density 602 of the powder is distributed in the range of 4.70 to 4.75 g / cm 3 The actual density of the ternary material is consistent with the true density of the physical properties of the ternary material. Since the ternary material is mixed with the conductive carbon black with a lower true density, the theoretical true density of the mixed powder is calculated to be 4.6988g / cm 3 Lower than the true density of ternary material powder.

[0108] The ternary material and the conductive carbon black were mixed at 600 rpm and 2400 rpm. The powder obtained by mixing the ternary material and the conductive carbon black at 2400 rpm was called the first mixed powder. Six sample powders were sampled from the first mixed powder. The measured true density 604 of the sample powders was distributed in the range of 4.58 to 4.62 g / cm 3 between.

[0109] The powder obtained by mixing the ternary material and the conductive carbon black at 600 rpm is called the second mixed powder. Six sample powders are sampled from the second mixed powder. The measured true density 606 of the sample powders is distributed in the range of 4.61 to 4.63 g / cm 3 between.

[0110] Figure 7 A schematic diagram of the discrete coefficient provided by an exemplary embodiment of the present application is shown. The component discrete coefficient 610 between the true densities of the powders of the ternary material measured 6 times before mixing the ternary material and the conductive carbon black is 0.65%, the first density discrete coefficient 612 between the measured true densities of the 6 sample powders sampled from the first mixed powder is 0.55%, and the second density discrete coefficient 614 between the measured true densities of the 6 sample powders sampled from the second mixed powder is 0.28%. The mixing uniformity of the method of mixing the ternary material and the conductive carbon black at 600 rpm is better than that of mixing the ternary material and the conductive carbon black at 2400 rpm, and the uniformity of the ternary material with uneven density distribution after mixing is improved.

[0111] Exemplarily, the density dispersion coefficient may be a dispersion degree between density differences of a plurality of sample powders in one-to-one correspondence, and the density dispersion coefficient may also be realized as a dispersion degree between measured true densities of a plurality of sample powders.

[0112] In summary, the method provided in this embodiment indicates the mixing uniformity of the mixed powder based on the density dispersion coefficient by calculating the density dispersion coefficient between the measured true density of multiple sample powders and multiple density differences of the theoretical true density; makes full use of the stability of the theoretical true density as a physical property of the powder to indicate the mixing uniformity of the sample powders; the theoretical true density of the mixed powder and the measured true density of the sample powder are the actual masses of the mixed powder and the sample powder per unit volume in an absolutely dense state, and both exclude the influence of the pores inside the powder or the gaps between the powder particles on the density, and the density difference can accurately indicate the mixing uniformity of the mixed powder.

[0113] Figure 8 A flow chart of a method for detecting mixed powder provided by an exemplary embodiment of the present application is shown. The method can be executed by a computer device. Figure 3 Based on the embodiment shown, it also includes step 501, step 502, step 503, step 504 and step 542:

[0114] Step 501: obtaining the powder true density of at least two component powders in the mixed powder;

[0115] Exemplarily, the mixed powder is obtained by mixing at least two component powders; the names of at least two component powders in the mixed powder are the preparation information of the mixed powder; exemplary, the true density of the at least two component powders is obtained by querying based on the names of the component powders.

[0116] Step 502: Calculate the component dispersion coefficient between the true densities of at least two component powders;

[0117] Exemplarily, the component dispersion coefficient is a statistic of the degree of dispersion between the true densities of at least two component powders. Exemplarily, the component dispersion coefficient is the ratio between the component standard deviation and the component average value. The component standard deviation is used to indicate the standard deviation between the true densities of at least two sample powders, and the component average value is used to indicate the average value between the true densities of at least two sample powders.

[0118] Step 503: Determine a first correction parameter according to the component dispersion coefficient;

[0119] Exemplarily, there is a positive correlation between the component discrete coefficient and the first correction parameter; further, the corresponding relationship between the component discrete coefficient and the first correction parameter can be fitted into at least one of other functions such as a linear function, a quadratic function, a logarithmic function, etc.; the present application does not limit the functional relationship in which the component discrete coefficient and the first correction parameter show a positive correlation.

[0120] Exemplarily, the value of the first correction parameter is usually a positive number. The first correction parameter is used to correct the density difference in a differential manner.

[0121] Step 504: Determine a sampling position of the sample powder according to the first correction parameter;

[0122] Exemplarily, as the first correction parameter increases, the difference in true density of powders between each component powder in the mixed powder increases; as the difference in true density of powders increases, each component powder in the mixed powder is prone to stratification. For example, high-density component powders are affected by gravity and are easily distributed in the lower layer of the mixed powder due to their high mass and small volume, resulting in poor mixing uniformity of the mixed powder.

[0123] As the first correction parameter increases, the distance between the sampling position and the edge position of the mixed powder increases; the sampling position of the sample powder is close to the edge position of the mixed powder, which makes it easy to sample the unevenly mixed position deposited on the edge of the mixed powder; and thus the sample powder can characterize the uniformity of the mixed powder.

[0124] Step 542: Calculate the difference between the density difference and the first correction parameter to obtain a corrected density difference;

[0125] Exemplarily, as the component dispersion coefficient increases, the difference between the true density of at least two component powders increases; due to the large difference between the true density of at least two component powders, even if there is a slight degree of uneven mixing in the sample powder, it will cause a large degree of change in the measured true density of the sample powder; in order to reduce the influence of the difference in the true density of the component powders on the mixing uniformity of the mixed powder based on the density difference indication. Calculate the difference between the density difference and the first correction parameter to obtain the corrected density difference;

[0126] Exemplarily, since the density difference is subtracted from the first correction parameter, the difference in true density of the component powders is mitigated, and the effect of the difference in the density difference on the mixing uniformity of the mixed powder is reduced; the obtained corrected density difference enables the evaluation of the mixing uniformity of the mixed powder based on the corrected density difference even when faced with multiple types of mixed powders of different components. Exemplarily, the corrected density difference is used to indicate the mixing uniformity of the mixed powder. Exemplarily, for multiple types of mixed powders of different components, directly comparing the corrected density difference can quantify the quality of the mixing uniformity between multiple types of mixed powders of different components.

[0127] It should be noted that step 501, step 502, step 503 and step 542 in this embodiment can be Figure 3 The various steps in the embodiment are combined into new embodiments and implemented separately, and this application does not limit this.

[0128] In summary, the method provided in this embodiment achieves the effect of reducing the difference in true density of the component powders on the mixing uniformity of the mixed powder indicated based on the density difference by subtracting the first correction parameter from the density difference; the obtained corrected density difference enables the evaluation of the mixing uniformity of the mixed powder based on the corrected density difference even when faced with multiple types of mixed powders of different components. The theoretical true density of the mixed powder and the measured true density of the sample powder are the actual mass of the mixed powder and the sample powder per unit volume in an absolutely dense state, both excluding the effect of the pores inside the powder or the gaps between the powder particles on the density, and the density difference can accurately indicate the mixing uniformity of the mixed powder.

[0129] Fig. 9 A flow chart of a method for detecting mixed powder provided by an exemplary embodiment of the present application is shown. The method can be executed by a computer device. Figure 3 Based on the illustrated embodiment, step 505, step 525, step 526 and step 544 are also included:

[0130] Step 505: obtaining at least four sampling positions in the mixed powder;

[0131] In this embodiment, the number of sample powders is at least four, and the at least four sample powders are obtained by sampling at at least four sampling positions in the mixed powder; illustratively, the at least four sampling positions can be randomly determined in the mixed powder, or can be pre-set sampling positions, or can be set in a manner such that the sampling positions are evenly distributed; the present application does not limit the method for determining the four sampling positions.

[0132] Step 525: determining a set of segregation locations from at least four sampling locations according to the measured true densities of at least four sample powders;

[0133] In this embodiment, the measured true density of the sample powder obtained in step 520 is the measured true density of the sample powder obtained by sampling at at least four sampling positions.

[0134] Exemplarily, the isolation position set includes at least three isolation positions, and the at least three isolation positions are used to indicate at least one connected domain; at least one connected domain can be a plane area or a three-dimensional space surrounded by some or all of the isolation positions in the isolation position set; for example, a triangular connected area surrounded by three isolation positions, and a triangular pyramid connected space surrounded by four isolation positions. It can be understood that in some examples, there are one or more isolation positions in the isolation position set located inside the connected domain. Furthermore, if there is a sampling position inside at least one connected domain indicated by the isolation position set, the sampling position is a isolation position as a constraint condition, and the isolation position set is determined.

[0135] For example, for any one of the separation positions in the separation position set, the density difference between the measured true density and the theoretical true density corresponding to the separation position exceeds the difference threshold. The difference threshold may be a preset empirical value or may be determined according to the true density of the component powders, which is not limited in the present application.

[0136] Exemplarily, a sampling position where the measured true density is too large or too small compared to the theoretical true density is determined as an isolation position; for example, the isolation position is obtained by screening at least four sampling positions with the density difference between the measured true density and the theoretical true density exceeding a difference threshold as a constraint.

[0137] Step 526: Determine a second correction parameter according to the spatial information of at least one connected domain;

[0138] Exemplarily, the spatial information is used to indicate the area or volume of at least one connected domain; the spatial information indicates the proportion of the portion of the mixed powder whose measured true density is too large or too small compared to the theoretical true density.

[0139] Exemplarily, there is a positive correlation between the spatial information and the second correction parameter; further, the corresponding relationship between the spatial information and the second correction parameter can be fitted into at least one of other functions such as a linear function, a quadratic function, a logarithmic function, etc.; the present application does not limit the functional relationship in which the spatial information and the second correction parameter present a positive correlation.

[0140] Exemplarily, the value of the second correction parameter is usually a positive number. The first correction parameter is used to correct the density difference in an additive manner.

[0141] Step 544: Calculate the sum of the density difference of at least four sample powders corresponding to each other and the second correction parameter to obtain a corrected density difference;

[0142] For example, as the spatial information increases, the proportion of the parts in the mixed powder whose measured true density is too large or too small compared to the theoretical true density increases; accordingly, there is a greater proportion of parts in the mixed powder whose measured true density has a difference threshold with the theoretical true density; some components in the mixed powder are aggregated in the connected domain and are not mixed evenly, and there is a need for further mixing of the connected domain.

[0143] By respectively calculating the sum of the density difference of at least four sample powders corresponding to each other and the second correction parameter, the demand for further mixing of the powders in the connected domain is quantitatively characterized, and the corrected density difference is used to indicate the mixing uniformity of the mixed powders.

[0144] In summary, in the method provided in this embodiment, the density difference between the measured true density and the theoretical true density of the powder in the connected domain exceeds the difference threshold, and some components in the mixed powder are aggregated in the connected domain and are not mixed evenly, so there is a need for further mixing of the connected domain. By calculating the sum of the density difference and the second correction parameter of at least four sample powders corresponding to each other, the need for further mixing of the powders in the connected domain is quantitatively characterized. The theoretical true density of the mixed powder and the measured true density of the sample powder are the actual masses of the mixed powder and the sample powder per unit volume in an absolutely dense state, and both exclude the influence of the pores inside the powder or the gaps between the powder particles on the density. The density difference can accurately represent the mixing uniformity of the mixed powder.

[0145] In an optional implementation of the present application, Fig. 9 Based on the illustrated embodiment, the present invention further includes:

[0146] Display prompt information;

[0147] Exemplarily, the prompt information is used to indicate the position of at least one connected domain in the mixed powder. By displaying the position of at least one connected domain in the mixed powder, the position where the connected domain needs to be further mixed is visually indicated;

[0148] Optionally, the prompt information is displayed when the proportion of at least one connected domain in the mixed powder exceeds the segregation ratio. Exemplarily, the segregation ratio may be preset or may be set according to the uniformity requirement of the mixed powder.

[0149] In summary, the method provided in this embodiment visually indicates the location where there is a need for further mixing of the connected domain through prompt information; expands the description information of the mixed powder that is fed back to the manager of the mixed powder, and quantitatively indicates the specific location of the connected domain where there is a need for further mixing.

[0150] In another optional implementation of the present application, Fig. 9 Based on the illustrated embodiment, the present invention further includes:

[0151] Determining supplementary control information based on spatial information of at least one connected domain;

[0152] Among them, the supplementary control information is control information of a mixing device that performs supplementary mixing on the mixed powder; exemplarily, the computer device that performs the mixed powder detection method has a mixed powder detection function, and the mixing device that performs supplementary mixing can be the above-mentioned computer device, and can also be implemented as a device with data transmission capability between the computer device.

[0153] Exemplarily, the mixing device includes a stirring part (such as at least one of a stirring rod, a stirring shovel head, a stirring blade connected to a rotating shaft, etc.), and the supplementary control information is used to instruct the stirring part of the mixing device to move through at least one connected domain; by controlling the stirring part to move through at least one connected domain, the part of the component powders gathered in the connected domain are dispersed, thereby achieving supplementary mixing of the mixed powder and improving the mixing uniformity. And / or, exemplary, the mixing device includes a transmission part such as a roller, which drives a part of the powder to move, thereby achieving relative movement between different parts of the powder, thereby achieving mixing of the powder; the supplementary control information is used to instruct the mixing device to drive the mixed powder to move, so that the powders in at least one connected domain move relative to each other, thereby achieving supplementary mixing of the mixed powder.

[0154] In summary, the method provided in this embodiment determines the supplementary control information that can achieve further stirring of the powder in the connected domain. By stirring the powder outside the connected domain into the connected domain and stirring the powder in the connected domain to outside the connected domain, supplementary mixing of the connected domain where some components are separately gathered is achieved, thereby improving the mixing uniformity of the mixed powder.

[0155] Those skilled in the art can understand that the above embodiments can be implemented independently, or the above embodiments can be freely combined to form new embodiments to implement the mixed powder detection method of the present application.

[0156] Fig.10 The following is a block diagram of a mixed powder detection device provided by an exemplary embodiment of the present application. The device includes:

[0157] An acquisition module 810 is used to acquire a theoretical true density of a mixed powder, where the mixed powder is a powder material used to prepare a battery;

[0158] The acquisition module 810 is further used to acquire the measured true density of the sample powder sampled from the mixed powder, where the measured true density is a measured value of the true density of the sample powder;

[0159] The processing module 820 is used to indicate the mixing uniformity of the mixed powder based on the density difference between the theoretical true density and the measured true density; the mixing uniformity of the mixed powder is negatively correlated with the absolute value of the density difference.

[0160] In an optional implementation of this embodiment, the acquisition module 810 is further configured to:

[0161] Obtaining a mixing ratio of at least two component powders in the mixed powder;

[0162] Obtaining the powder true density of the at least two component powders;

[0163] The powder true density of the at least two component powders is calculated, and based on the weighted average of the mixing ratio, the theoretical true density of the mixed powder is obtained.

[0164] In an optional implementation of this embodiment, the mixed powder is obtained by mixing at least two component powders, and the at least two component powders include battery positive and negative electrode materials and a conductive agent;

[0165] Among them, the positive and negative electrode materials of the battery include at least one of graphite material, lithium iron phosphate material, and ternary material; the conductive agent includes at least one of conductive carbon black, Ketjen black, carbon nanotubes, and vapor-grown carbon fiber.

[0166] In an optional implementation of this embodiment, the acquisition module 810 is further configured to:

[0167] Obtaining measured true densities of at least two sample powders sampled from the mixed powder, wherein the at least two sample powders correspond one-to-one to at least two sampling positions in the mixed powder;

[0168] The processing module 820 is further configured to:

[0169] Calculating the difference between the measured true density of the at least two sample powders and the theoretical true density respectively, to obtain a density difference of the at least two sample powders in one-to-one correspondence;

[0170] The density dispersion coefficient between the density differences of the at least two sample powders corresponding to each other is calculated, and the density dispersion coefficient is used to indicate the mixing uniformity of the mixed powder. There is a negative correlation between the mixing uniformity of the mixed powder and the density dispersion coefficient.

[0171] In an optional implementation of this embodiment, the acquisition module 810 is further configured to:

[0172] Obtaining the powder true density of at least two component powders in the mixed powder;

[0173] The processing module 820 is further configured to:

[0174] Calculating the component dispersion coefficient between the powder true densities of the at least two component powders;

[0175] Determining a first correction parameter according to the component dispersion coefficient, wherein the component dispersion coefficient and the first correction parameter are positively correlated;

[0176] The difference between the density difference and the first correction parameter is calculated to obtain a corrected density difference, and the corrected density difference is used to indicate the mixing uniformity of the mixed powder.

[0177] In an optional implementation of this embodiment, the processing module 820 is further configured to:

[0178] The sampling position of the sample powder is determined according to the first correction parameter; as the first correction parameter increases, the distance between the sampling position and the edge position of the mixed powder increases.

[0179] In an optional implementation of this embodiment, the number of the sample powders is at least four, and the at least four sample powders correspond one-to-one to the at least four sampling positions in the mixed powder; the acquisition module 810 is further used to:

[0180] Acquiring the at least four sampling positions in the mixed powder;

[0181] The processing module 820 is further configured to:

[0182] Determine a segregation position set from the at least four sampling positions according to measured true densities of at least four sample powders, wherein the segregation position set includes at least three segregation positions, and the at least three segregation positions are used to indicate at least one connected domain;

[0183] Determine a second correction parameter according to spatial information of the at least one connected domain, wherein the spatial information and the second correction parameter are positively correlated, and the spatial information is used to indicate a region area or a spatial volume of the at least one connected domain;

[0184] The sum of the density difference and the second correction parameter corresponding to at least four sample powders is calculated respectively to obtain a corrected density difference, and the corrected density difference is used to indicate the mixing uniformity of the mixed powder; wherein the density difference between the measured true density corresponding to the segregation position and the theoretical true density exceeds a difference threshold.

[0185] In an optional implementation of this embodiment, the device further includes:

[0186] The display module 830 is used to display prompt information, where the prompt information is used to indicate the position of the at least one connected domain in the mixed powder.

[0187] In an optional implementation of this embodiment, the processing module 820 is further configured to:

[0188] Determining supplementary control information according to the spatial information of the at least one connected domain;

[0189] Among them, the supplementary control information is control information of a mixing device that performs supplementary mixing on the mixed powder; the supplementary control information is used to instruct the stirring part of the mixing device to move through the at least one connected domain, and / or when the mixing device drives the mixed powder to move, relative movement occurs between the powders in the at least one connected domain.

[0190] One point that needs to be explained is that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0191] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method; the technical effects achieved by each module performing operations are the same as those in the embodiment of the method, and will not be elaborated here.

[0192] An embodiment of the present application also provides a computer device, which includes: a processor and a memory, wherein a computer program is stored in the memory; the processor is used to execute the computer program in the memory to implement the mixed powder detection method provided by the above-mentioned method embodiments.

[0193] Optionally, the computer device is a server. Fig.11 It is a structural block diagram of a server provided by an exemplary embodiment of the present application.

[0194] Typically, the server 2300 includes: a processor 2301 and a memory 2302 .

[0195] The processor 2301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 2301 may be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 2301 may also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 2301 may be integrated with a graphics processing unit (GPU), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 2301 may also include an artificial intelligence (AI) processor, which is used to process computing operations related to machine learning.

[0196] The memory 2302 may include one or more computer-readable storage media, which may be non-transitory. The memory 2302 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 2302 is used to store at least one instruction, which is used to be executed by the processor 2301 to implement the mixed powder detection method provided in the method embodiment of the present application.

[0197] In some embodiments, the server 2300 may also optionally include: an input interface 2303 and an output interface 2304. The processor 2301, the memory 2302, the input interface 2303, and the output interface 2304 may be connected via a bus or a signal line. Each peripheral device may be connected to the input interface 2303 and the output interface 2304 via a bus, a signal line, or a circuit board. The input interface 2303 and the output interface 2304 may be used to connect at least one peripheral device related to input / output (I / O) to the processor 2301 and the memory 2302. In some embodiments, the processor 2301, the memory 2302, the input interface 2303, and the output interface 2304 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 2301, the memory 2302, the input interface 2303, and the output interface 2304 may be implemented on a separate chip or circuit board, which is not limited in the embodiments of the present application.

[0198] Those skilled in the art will appreciate that the structure shown above does not constitute a limitation on the server 2300 , and may include more or fewer components than shown in the figure, or combine certain components, or adopt a different component arrangement.

[0199] In an exemplary embodiment, a chip is also provided, the chip comprising a programmable logic circuit and / or program instructions, and when the chip is run on a computer device, it is used to implement the mixed powder detection method described in the above aspects.

[0200] In an exemplary embodiment, a computer program product is also provided, the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor reads and executes the computer instructions from the computer-readable storage medium to implement the mixed powder detection method provided by each of the above method embodiments.

[0201] In an exemplary embodiment, a computer-readable storage medium is further provided, in which a computer program is stored. The computer program is loaded and executed by a processor to implement the mixed powder detection method provided by the above-mentioned method embodiments.

[0202] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0203] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0204] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting a mixed powder, characterized in that: The method comprises: Obtaining a theoretical true density of a mixed powder, wherein the mixed powder is a powder material for preparing a battery; Obtaining a measured true density of a sample powder sampled from the mixed powder, wherein the measured true density is a measured value of the true density of the sample powder; Based on the density difference between the theoretical true density and the measured true density, the mixing uniformity of the mixed powder is indicated; and there is a negative correlation between the mixing uniformity of the mixed powder and the absolute value of the density difference.

2. The method according to claim 1, characterized in that The step of obtaining the theoretical true density of the mixed powder comprises: Obtaining a mixing ratio of at least two component powders in the mixed powder; Obtaining the powder true density of the at least two component powders; The powder true density of the at least two component powders is calculated, and based on the weighted average of the mixing ratio, the theoretical true density of the mixed powder is obtained.

3. The method according to claim 1 or 2, characterized in that: The step of obtaining the measured true density of the sample powder sampled from the mixed powder comprises: Obtaining measured true densities of at least two sample powders sampled from the mixed powder, wherein the at least two sample powders correspond one-to-one to at least two sampling positions in the mixed powder; The indicating the mixing uniformity of the mixed powder based on the density difference between the theoretical true density and the measured true density includes: Calculating the difference between the measured true density of the at least two sample powders and the theoretical true density respectively, to obtain a density difference of the at least two sample powders in one-to-one correspondence; The density dispersion coefficient between the density differences of the at least two sample powders corresponding to each other is calculated, and the density dispersion coefficient is used to indicate the mixing uniformity of the mixed powder. There is a negative correlation between the mixing uniformity of the mixed powder and the density dispersion coefficient.

4. The method according to claim 1 or 2, characterized in that: The method further comprises: Obtaining the powder true density of at least two component powders in the mixed powder; Calculating the component dispersion coefficient between the powder true densities of the at least two component powders; Determining a first correction parameter according to the component dispersion coefficient, wherein the component dispersion coefficient and the first correction parameter are positively correlated; The difference between the density difference and the first correction parameter is calculated to obtain a corrected density difference, and the corrected density difference is used to indicate the mixing uniformity of the mixed powder.

5. The method according to claim 4, characterized in that The method further comprises: A sampling position of the sample powder is determined according to the first correction parameter; as the first correction parameter increases, a distance between the sampling position and an edge position of the mixed powder increases.

6. The method according to claim 1 or 2, characterized in that: The number of the sample powders is at least four, and the at least four sample powders correspond one-to-one to at least four sampling positions in the mixed powder; the method further comprises: Acquiring the at least four sampling positions in the mixed powder; Determine a segregation position set from the at least four sampling positions according to measured true densities of at least four sample powders, wherein the segregation position set includes at least three segregation positions, and the at least three segregation positions are used to indicate at least one connected domain; Determine a second correction parameter according to spatial information of the at least one connected domain, wherein the spatial information and the second correction parameter are positively correlated, and the spatial information is used to indicate a region area or a spatial volume of the at least one connected domain; Calculating the sum of the density difference and the second correction parameter corresponding to at least four sample powders respectively to obtain a corrected density difference, wherein the corrected density difference is used to indicate the mixing uniformity of the mixed powder; The density difference between the measured true density and the theoretical true density corresponding to the separation position exceeds a difference threshold.

7. The method according to claim 6, characterized in that The method further comprises: Prompt information is displayed, where the prompt information is used to indicate a position of the at least one connected domain in the mixed powder.

8. The method according to claim 6, characterized in that The method further comprises: Determining supplementary control information according to the spatial information of the at least one connected domain; Among them, the supplementary control information is control information of a mixing device that performs supplementary mixing on the mixed powder; the supplementary control information is used to instruct the stirring part of the mixing device to move through the at least one connected domain, and / or when the mixing device drives the mixed powder to move, relative movement occurs between the powders in the at least one connected domain.

9. The method according to claim 1 or 2, characterized in that: The mixed powder is obtained by mixing at least two component powders, wherein the at least two component powders include positive and negative electrode materials of the battery and a conductive agent; Among them, the positive and negative electrode materials of the battery include at least one of graphite material, lithium iron phosphate material, and ternary material; the conductive agent includes at least one of conductive carbon black, Ketjen black, carbon nanotubes, and vapor-grown carbon fiber.

10. A computer device, characterized in that: The computer device includes: a processor and a memory, wherein the memory stores at least one program; the processor is used to execute the at least one program in the memory to implement the mixed powder detection method as described in any one of claims 1 to 9.

11. A computer-readable storage medium, characterized in that: The readable storage medium stores executable instructions, and the executable instructions are loaded and executed by the processor to implement the mixed powder detection method according to any one of claims 1 to 9.

12. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the mixed powder detection method according to any one of claims 1 to 9.

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