Material mixing uniformity detection device and method, material mixing system and method

Abstract

This invention belongs to the field of uniformity detection technology, and discloses a material mixing uniformity detection device and method, as well as a material mixing system and method. The material mixing uniformity detection device includes: a separation unit for separating pre-collected mixtures; at least one weighing unit for acquiring the mass of the pre-collected mixture and the mass of each material separated by the separation unit; and a uniformity detection unit for outputting uniformity detection information of the mixture based on a preset mass ratio, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit. This material mixing uniformity detection device has a simple structure, is easy to operate and implement, and can accurately determine the uniformity of the mixture. It is particularly suitable for real-time detection of the uniformity of electrode dry powder mixtures in electrode slurries, ensuring the product performance of electrode slurries.

Description

Technical Field

[0001] This invention belongs to the field of uniformity detection technology, specifically relating to a material mixing uniformity detection device and method, and a material mixing system and method. Background Technology

[0002] The current manufacturing process for electrode slurries involves first mixing positive or negative electrode active materials, conductive agents, binders, and thickeners to obtain an electrode dry powder mixture; then, this mixture is mixed with a solvent to obtain the electrode slurry. Existing methods cannot perform real-time monitoring of the uniformity of the electrode dry powder mixture; its uniformity can only be defined by the mixing time, meaning the electrode slurry can only be tested after production, and its mixing uniformity cannot be guaranteed. Furthermore, uneven mixing of the electrode dry powder mixture can affect the consistency of the battery's internal resistance, capacity, and other electrochemical properties, leading to problems such as poor differential pressure consistency in electric vehicle applications. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a material mixing uniformity detection device and method, and a material mixing system and method.

[0004] A first aspect of the present invention provides a material mixing uniformity detection device, comprising:

[0005] The separation unit separates the pre-collected mixture;

[0006] At least one weighing unit is used to obtain the mass of the pre-collected mixture and the mass of each material separated by the separation unit.

[0007] The uniformity detection unit outputs detection information on the uniformity of the mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit.

[0008] In addition, the material mixing uniformity detection device and method, material mixing system and method of the present invention may also have the following additional technical features:

[0009] Preferably, the uniformity detection unit,

[0010] Based on the initial proportion and target proportion of each material in the mixture, the uniformity detection information of the mixture is output: if the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, the uniformity detection information of the mixture is qualified is output.

[0011] The initial proportion of each material in the mixture is determined based on the preset mass ratio of the mixture; the target proportion of each material in the mixture is determined based on the mass of the pre-collected mixture and the mass of each material separated by the separation unit.

[0012] Preferably, the material mixing uniformity detection device further includes:

[0013] The collection unit collects the mixture and transports the collected mixture to the separation unit.

[0014] Preferably, the data acquisition unit includes: a storage tank and a pressure regulating component; wherein the storage tank has an inlet and an outlet;

[0015] The pressure regulating component adjusts the pressure inside the storage tank to create a negative pressure so that the mixture is drawn into the storage tank from the inlet; and adjusts the pressure inside the storage tank to create a positive pressure so that the mixture inside the storage tank is discharged from its outlet into the separation unit.

[0016] Preferably, the outlet of the storage tank and the inlet of the separation unit are connected by a first connecting pipe, and a first valve is provided on the first connecting pipe.

[0017] Preferably, the first valve is an electric valve.

[0018] Preferably, the pressure regulating assembly includes: an exhaust fan and an inflation fan, and the storage tank is provided with at least one gas port; wherein,

[0019] The exhaust fan draws gas from the storage tank through the gas port to create a negative pressure inside the storage tank;

[0020] The air inflator inflates the storage tank through the gas port to create positive pressure inside the storage tank.

[0021] Preferably, the weighing unit includes:

[0022] The first weighing device obtains the mass of the pre-collected mixture, or the total mass of the materials separated by the separation unit;

[0023] The second weighing device obtains the mass of each material separated by the separation unit.

[0024] Preferably, the first weighing device is located outside the storage tank. The first weighing device acquires the total weight information of the storage tank and the pre-collected mixture inside the storage tank, and obtains the mass of the pre-collected mixture based on the pre-collected mass information of the storage tank.

[0025] Alternatively, the first weighing device is disposed inside the storage tank. The first weighing device has a receiving part that matches the shape of the storage tank. The receiving part receives the mixture inside the storage tank, and the first weighing device obtains the mass of the mixture received by the receiving part.

[0026] Alternatively, the first weighing device acquires the mass of each material separated by the separation unit and sums the masses of each material to obtain the total mass of each material separated by the separation unit.

[0027] Preferably, the separation unit is provided with at least one discharge port;

[0028] Each discharge port of the separation unit is provided with a second weighing device, or at least some discharge ports of the separation unit are provided with a second weighing device.

[0029] Preferably, the separation unit includes a separator, and more preferably a gravity separator.

[0030] Preferably, the material mixing uniformity detection device includes an electrode slurry mixing uniformity detection device; the mixture is a solid.

[0031] A second aspect of the present invention provides a material mixing system, wherein the material mixing device includes the material mixing uniformity detection device described in any embodiment of the present application.

[0032] Preferably, the material mixing system further includes a mixing unit, which mixes materials at a preset mass ratio to obtain a mixture.

[0033] Preferably, the mixing unit includes a stirrer or a mixer; wherein,

[0034] The mixer includes a mixing tank, a mixing shaft, and a first driving device. The output end of the first driving device is connected to the mixing shaft. The first driving device drives the mixing shaft to rotate and stir inside the mixing tank, so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture.

[0035] The mixer includes a mixing tank and a second driving device. The second driving device drives the mixing tank to rotate so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture.

[0036] Preferably, the mixing unit has a discharge port, and a second connecting pipe is provided between the discharge port of the mixing unit and the inlet of the collecting unit, and a second valve is provided on the second connecting pipe.

[0037] Preferably, the second valve is an electric valve.

[0038] A third aspect of the present invention provides a method for detecting the uniformity of material mixing, comprising:

[0039] The pre-collected mixture is separated to obtain the separated materials;

[0040] Obtain the mass of the pre-collected mixture, and obtain the mass of each separated material;

[0041] Based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each separated material, the uniformity detection information of the mixture is output.

[0042] Preferably, the step of outputting the uniformity detection information of the mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each separated material includes:

[0043] The initial proportion of each material in the mixture is determined according to the preset mass ratio of the mixture;

[0044] Based on the mass of the pre-collected mixture and the mass of each material after separation, determine the target proportion of each material in the mixture;

[0045] If the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, then the uniformity of the mixture is output as qualified.

[0046] A fourth aspect of the present invention provides a material mixing method, the material mixing method comprising:

[0047] Mix at least two materials in a preset mass ratio to obtain a mixture;

[0048] The mixture is pre-collected, and the uniformity detection method for material mixing described in any embodiment of this application is used to detect the uniformity of the pre-collected mixture. If the detection information indicating that the uniformity of the mixture is qualified is output, the material mixing is stopped; otherwise, the material with the preset mass ratio is controlled to continue mixing.

[0049] Preferably, the mixture is pre-collected at a preset time, and the uniformity of the mixture is detected. If the output shows that the uniformity of the mixture is unqualified, the material at the preset mass ratio is controlled to continue mixing for a preset time, and the mixture is collected again and the uniformity is detected until the output shows that the uniformity of the mixture is qualified.

[0050] Preferably, the mixing of at least two materials in a preset mass ratio to obtain a mixture includes:

[0051] The raw materials for preparing electrode slurry are mixed according to a preset mass ratio to obtain electrode dry powder mixture.

[0052] Preferably, the electrode slurry includes a positive electrode slurry or a negative electrode slurry; the raw materials for preparing the electrode slurry include at least: positive or negative electrode active materials, conductive agents, and binders, and preferably also include thickeners.

[0053] Preferably, if the output test information indicates that the uniformity of the electrode dry powder mixture is qualified, then the electrode dry powder mixture is mixed with a solvent to obtain an electrode slurry.

[0054] This invention provides a material mixing uniformity detection device and method, as well as a material mixing system and method. The material mixing uniformity detection device uses a separation unit to separate a pre-collected mixture to separate the individual materials in the mixture; then, a weighing unit is used to obtain the mass of the pre-collected mixture and the mass of each material separated by the separation unit; finally, the uniformity detection unit can output the detection information of the uniformity of the pre-collected mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit. This device has a simple structure, is easy to operate and implement, and can accurately determine the uniformity of the mixture. It is especially suitable for real-time detection of the uniformity of electrode dry powder mixtures in electrode slurries, ensuring the product performance of electrode slurries. Attached Figure Description

[0055] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0056] Figure 1 An exemplary structural diagram of the material mixing uniformity detection device provided in the embodiments of this application;

[0057] Figure 2 This is another exemplary structural diagram of the material mixing uniformity detection device provided in the embodiments of this application;

[0058] Figure 3 An exemplary structural diagram of a material mixing system provided in an embodiment of this application;

[0059] Figure 4 Another exemplary structural diagram of the material mixing system provided in the embodiments of this application;

[0060] Figure 5 This is an exemplary flowchart of a material mixing uniformity detection method provided in an embodiment of this application.

[0061] In the above diagram: 100 Material mixing uniformity detection device; 110 Acquisition unit; 111 Storage tank; 112 Exhaust fan; 1121 Negative pressure valve; 113 Aerator; 1131 Positive pressure valve; 120 Separation unit; 130 Weighing unit; 131 First weighing device; 132 Second weighing device; 1321 Material tank; 140 Uniformity detection unit; 150 First connecting pipe; 151 First valve; 160 Second connecting pipe; 161 Second valve;

[0062] 200 Material mixing system; 210 Mixing unit. Detailed Implementation

[0063] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0064] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0065] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0066] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0069] refer to Figure 1 In a first aspect, this application provides a material mixing uniformity detection device 100, comprising:

[0070] Separation unit 120 separates the pre-collected mixture;

[0071] At least one weighing unit 130 acquires the mass of the pre-collected mixture and the mass of each material separated by the separation unit 120;

[0072] The uniformity detection unit 140 outputs the uniformity detection information of the mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit 120.

[0073] Specifically, the pre-collected mixture is obtained by mixing at least two materials at a preset mass ratio for a preset time. A separation unit 120 separates the pre-collected mixture to isolate each material. A weighing unit 130 then acquires the mass of the pre-collected mixture and the mass of each material separated by the separation unit 120. Finally, a uniformity detection unit 140 outputs uniformity detection information of the pre-collected mixture based on the preset mass ratio, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit 120.

[0074] The material mixing uniformity detection device 100 provided in this application embodiment has a simple structure and is easy to operate and implement. It can detect the uniformity of the mixture in real time and accurately judge the uniformity of the mixture, so that the mixture can be dispersed more evenly, which is beneficial to the preparation of subsequent products such as electrode paste, ensuring the performance of subsequent products and improving product quality.

[0075] In some embodiments, the uniformity detection unit 140 is specifically used for:

[0076] Based on the initial proportion and target proportion of each material in the mixture, the uniformity detection information of the mixture is output: if the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, the uniformity detection information of the mixture is qualified is output.

[0077] The initial proportion of each material in the mixture is determined according to the preset mass ratio of the mixture, and the target proportion of each material in the mixture is determined according to the mass of the pre-collected mixture and the mass of each material separated by the separation unit 120.

[0078] Specifically, the mixture is obtained by mixing at least two materials in a preset mass ratio, and the initial proportion of each material in the mixture can be determined according to the preset mass ratio. For example, if material A and material B are mixed in a preset mass ratio of m1:n1, then the initial proportion of material A is m1 / (m1+n1), and the initial proportion of material B is n1 / (m1+n1).

[0079] The target proportion of each material in the mixture is determined based on the mass of the pre-collected mixture and the mass of each material separated by the separation unit 120. For example, if the mass of the pre-collected mixture is m, the mass of material A obtained from the mixture separation is m2, and the mass of material B obtained from the separation is n2, where m = m2 + n2; then the target proportion of material A obtained from the separation is m2 / m, and the target proportion of material B obtained from the separation is n2 / m.

[0080] The percentage threshold range is set to [p, q], where q > p. If the initial percentage of material A is p ≤ m1 / (m1+n1)-m2 / m ≤ q and p ≤ n1 / (m1+n1)-n2 / m ≤ q, then the output is a test message indicating that the uniformity of the mixture is qualified; otherwise, the output is a test message indicating that the uniformity of the mixture is unqualified. Those skilled in the art can set the percentage threshold range according to actual needs. For example, q can be any value from 0.5% to 1.5%, preferably 1%; p can be any value from -(0.5% to 1.5%), preferably -1%.

[0081] It should be noted that the embodiments of this application use two materials A and B as examples to illustrate the uniformity testing standard of the mixture. If the mixture is made of two or more materials, for example, if the mixture is made of materials A, B, C, D, and E, the material mixing uniformity testing device 100 provided in this application can obtain the initial proportions of materials A, B, C, D, and E as well as the target proportions of materials A, B, C, D, and E. When performing uniformity testing on the mixture, a portion of the materials in the mixture can be selected for uniformity judgment. For example, the uniformity of the mixture can be determined based on the initial proportions of materials A, B, and C and the target proportions of the corresponding materials. As long as the difference between the initial proportions of materials A, B, and C and the target proportions of the corresponding materials is within the proportion threshold range, the uniformity of the mixture is considered to be qualified. Taking the raw materials for preparing electrode slurry as an example, the raw materials for preparing electrode slurry include positive or negative electrode active materials, conductive agents, thickeners, binders, etc. When judging the uniformity of the electrode dry powder mixture of electrode slurry, if the difference between the initial proportion of positive or negative electrode active materials, conductive agents and binders and the target proportion of the materials is within the proportion threshold range, then the detection information of the uniformity of the electrode dry powder mixture of electrode slurry is output as qualified.

[0082] In some implementations, reference Figure 1 The material mixing uniformity detection device 100 further includes:

[0083] The collection unit 110 collects the mixture and transports the collected mixture to the separation unit 120.

[0084] Specifically, the collection unit 110 collects a portion of the pre-mixed material and transports it to the separation unit 120 for subsequent material separation. This achieves automated collection and transport of the mixture, improving the intelligent operation of material mixing uniformity detection. The mass of the mixture collected by the collection unit 110 accounts for 0.5% to 1.5% of the mass of the mixture obtained after mixing according to a preset mass ratio, preferably 1%. The mass of the mixture collected by the collection unit 110 should not be less than 0.5%, as too little collection will prevent subsequent material separation; conversely, the mass of the mixture collected should not exceed 1.5%, as excessive collection will lead to waste and increase manufacturing costs.

[0085] In some implementations, reference Figure 2 The acquisition unit 110 includes: a storage tank 111 and a pressure regulating component; wherein, the storage tank 111 has an inlet and an outlet;

[0086] The pressure regulating component adjusts the pressure inside the storage tank 111 to form a negative pressure so that the mixture is drawn into the storage tank 111 from the inlet; and adjusts the pressure inside the storage tank 111 to form a positive pressure so that the mixture inside the storage tank 111 is discharged into the separation unit 120 from its own outlet.

[0087] Specifically, the pressure regulating component can adjust the pressure inside the storage tank 111. For example, it can adjust the pressure inside the storage tank 111 to create a negative pressure so that the mixture is automatically drawn into the storage tank 111 from its inlet, and adjust the pressure inside the storage tank 111 to create a positive pressure so that the mixture inside the storage tank 111 is discharged into the separation unit 120 from its outlet. The storage tank 111 can temporarily store the mixture it draws in, facilitating the acquisition of quality information about the mixture within the storage tank 111. In this example, the pressure regulating component enables automated collection and transportation of the mixture, improving the intelligent operation of material mixing uniformity detection.

[0088] In some implementations, reference Figure 2 The outlet of the storage tank 111 is connected to the inlet of the separation unit 120 by a first connecting pipe 150, and a first valve 151 is provided on the first connecting pipe 150.

[0089] Specifically, the storage tank 111 stores pre-collected mixtures, facilitating subsequent weighing and separation operations. The outlet of the storage tank 111 is connected to the inlet of the separation unit 120 via a first connecting pipe 150. A first valve 151 is installed on the first connecting pipe 150 at one end near the storage tank 111, one end near the separation unit 120, or in the middle of the first connecting pipe 150. Opening the first valve 151 connects the storage tank 111 and the separation unit 120, while closing the first valve 151 disconnects the storage tank 111 and the separation unit 120.

[0090] In some embodiments, the first valve 151 is an electric valve.

[0091] Specifically, the first valve 151 is an electric valve, enabling automated control of the first valve 151. For example, the material mixing uniformity detection device 100 of this application also includes a controller, such as a PLC controller. The signal output terminal of the controller is electrically connected to the signal input terminal of the electric valve. After the pre-collected mixture in the storage tank 111 is weighed, the pressure regulating component adjusts the storage tank 111 to form a positive pressure, and the controller controls the first valve 151 to open, allowing the mixture in the storage tank 111 to be discharged into the separation unit 120.

[0092] In some implementations, reference Figure 2 The pressure regulating assembly includes an exhaust fan 112 and an inflator 113, and the storage tank 111 is provided with at least one gas port; wherein,

[0093] The exhaust fan 112 draws the gas in the storage tank 111 out of the gas port to create a negative pressure inside the storage tank 111;

[0094] The air inflator 113 inflates the storage tank 111 through the gas port to create positive pressure inside the storage tank 111.

[0095] Specifically, the storage tank 111 is equipped with one or two gas ports. When only one gas port is provided, it can be either an inlet or an outlet, and an exhaust fan 112 or an inflator 113 can be connected to it as needed. When two gas ports are provided, one is an inlet with a negative pressure valve 1121, and the other is an outlet with a positive pressure valve 1131, the inflator 113 is connected to the inlet, and the exhaust fan 112 is connected to the outlet. The exhaust fan 112 is a vacuum pump, and the inflator 113 is a blower. The exhaust fan 112 draws gas from the storage tank 111 through the gas port to create a negative pressure inside the tank. This negative pressure is used to collect the mixture, which is then drawn into the storage tank 111. The aerator 113 inflates the storage tank 111 through the gas port to create positive pressure inside the storage tank 111, and uses positive pressure to force the collected mixture into the separation unit 120. By using the cooperation of the exhaust fan 112 and the aerator 113, the automated collection and transportation of the mixture is realized, improving the efficiency of uniformity detection of the mixture.

[0096] In some embodiments, the weighing unit 130 includes:

[0097] The first weighing device 131 obtains the mass of the pre-collected mixture, or obtains the total mass of the materials separated by the separation unit 120;

[0098] The second weighing device 132 obtains the mass of each material separated by the separation unit 120.

[0099] Specifically, the first weighing device 131 acquires the mass of the pre-collected mixture by weighing the pre-collected mixture after it has been collected by the collection unit 110 and before it has been separated; alternatively, it can acquire the mass of each separated material after separation and sum the masses of the separated materials. The mixture in the storage tank 111 is completely discharged into the separation unit 120 under positive pressure; therefore, the total mass of the materials separated by the separation unit 120 is the same as the mass of the pre-collected mixture.

[0100] The second weighing device 132 obtains the mass of each material separated by the separation unit 120. Based on the mass of each material separated and the mass of the mixture obtained, the target proportion of each material can be obtained.

[0101] It should be noted that in the embodiments of this application, the first weighing device 131 and the second weighing device 132 can be the same weighing device, which respectively obtains the mass of the mixture in the storage tank 112, the mass of each material separated by the separation unit 120, and the total mass of each material separated.

[0102] In some embodiments, the first weighing device 131 is disposed outside the storage tank 111. The first weighing device 131 acquires the total weight information of the storage tank 111 and the pre-collected mixture inside the storage tank 111, and obtains the mass of the pre-collected mixture based on the pre-collected mass information of the storage tank 111.

[0103] Alternatively, the first weighing device 131 is disposed inside the storage tank 111. The first weighing device 131 has a receiving part that matches the shape of the storage tank 111. The receiving part receives the mixture inside the storage tank 111, and the first weighing device 131 obtains the mass of the mixture received by the receiving part.

[0104] Alternatively, the first weighing device 131 acquires the mass of each material separated by the separation unit 120, and sums the masses of each material to obtain the total mass of each material separated by the separation unit 120.

[0105] Specifically, the location of the first weighing device 131 can be implemented in several ways. For example, the first weighing device 131 can be located outside the storage tank 111, such as below the storage tank 111. The first weighing device 131 can be used to obtain the total weight information of the storage tank 111 and the mixture inside the storage tank 111. By removing the mass of the storage tank 111, the mass of the pre-collected mixture can be obtained. In this example, the storage tank 111 is made of a lightweight material, such as plastic, so that the mass of the storage tank 111 is relatively light, thereby reducing the calculation error of the mass of the mixture inside the storage tank 111. The first weighing device 131 is installed outside the storage tank 111, which can obtain the quality information of the mixture inside the storage tank 111 in a sealed state. If the mixture is in powder form, it ensures that the mixture is collected, weighed and transported to the separation unit 120 in a sealed state throughout the entire process, avoiding the problem of inaccurate calculation of the material target ratio caused by the powder mixture flying away, and also reducing the environmental pollution caused by dust from the powder mixture.

[0106] For example, the first weighing device 131 is set at the discharge port of the separation unit 120, which can obtain the mass of each material separated by the separation unit 120, and sum the masses of each separated material to obtain the mass of the collected mixture; the target proportion of the corresponding material is determined according to the mass ratio of the mass of each separated material to the mass of the collected mixture.

[0107] For example, the first weighing device 131 is installed inside the storage tank 111. The first weighing device 131 has a receiving part, such as a tray. The shape of the receiving part matches the shape of the bottom inside the storage tank 111. The receiving part can completely cover the bottom of the storage tank 111, ensuring that the mixture sucked in from the inlet of the storage tank 111 by using negative pressure can be completely caught by the receiving part. Thus, the mass of the collected mixture can be directly obtained by the first weighing device 131, ensuring the accuracy of the mixture mass measurement.

[0108] In some embodiments, the separation unit 120 is provided with at least one discharge port;

[0109] Each discharge port of the separation unit 120 is provided with a second weighing device 132, or at least some discharge ports of the separation unit 120 are provided with a second weighing device 132.

[0110] Specifically, the separation unit 120 has at least one discharge port, such as Figure 2 As shown, the separation unit 120 has three discharge ports. Each discharge port is connected to a corresponding material tank 1321 and equipped with a second weighing device 132. The second weighing device 132 acquires the mass of the corresponding material in each material tank 1321, as well as the total mass of the separated materials, and thus can calculate the target proportion of each material. That is, the second weighing device can acquire the mass of the material tank 1321 and the mass of the corresponding material in the material tank 1321, and tare the mass of the material tank 1321 to obtain the mass of the corresponding material in the material tank 1321.

[0111] It is understood that those skilled in the art can set the number of second weighing devices 132 according to actual needs. For example, one or more second weighing devices 132 can be set at each discharge port of the separation unit 120. When at least some discharge ports use a second weighing device 132, the number of second weighing devices 132 can be reduced, thereby reducing the detection cost.

[0112] In some embodiments, the separation unit 120 includes a separator, preferably a gravity separator.

[0113] Specifically, centrifuges work by separating different materials due to their varying densities and sizes. These materials, with their different densities and sizes, generate different centrifugal forces, resulting in varying settling velocities within the centrifuge drum. Ultimately, during rotation, the centrifugal force separates the different materials layer by layer, into different particles.

[0114] In this embodiment, a gravity separator is preferably used to separate the mixture collected by the collection unit 110, obtaining the separated materials. The gravity separator operates at different speeds based on the different densities of the materials, allowing heavy and light materials to be separated in different proportions. During the operation of the gravity separator, the initial mixture enters the centrifuge drum through the feed pipe. The centrifuge drum generates centrifugal force during high-speed rotation. Due to the different specific gravities of the materials, there are different settling velocities. The heavier materials will accelerate and rotate due to the centrifugal force, while the lighter materials will remain in the centrifuge drum. As the centrifugal force continues to increase, the heavier materials will be thrown away and discharged from the discharge port, while the lighter materials will remain in the centrifuge drum and be discharged through the outlet at the top of the centrifuge drum. By continuously opening and closing the discharge port and outlet, materials of different densities are separated, completing the separation of the materials in the mixture.

[0115] In some embodiments, the material mixing uniformity detection device 100 includes an electrode slurry mixing uniformity detection device; the mixture is a solid.

[0116] Specifically, the electrode slurry mixing uniformity testing device detects the uniformity of the dry powder mixture of solid electrode slurry. The electrode slurry can be either a positive electrode slurry or a negative electrode slurry. The raw materials for preparing the positive electrode slurry include positive electrode active material, conductive agent, and binder, with a mass ratio of positive electrode active material: conductive agent: binder of (96-97):(1-2):(1-2). The raw materials for preparing the negative electrode slurry include negative electrode active material, conductive agent, and binder, preferably also including a thickener, with a mass ratio of negative electrode active material, conductive agent, and binder of (94-96):(1.5-3.5):(0.5-1.5). The electrode slurry mixing uniformity testing device provided in this application embodiment can detect the uniformity of the dry powder mixture of electrode slurry. After determining that the uniformity of the dry powder mixture of electrode slurry is qualified, the dry powder mixture of electrode slurry is then mixed with a solvent to obtain an electrode slurry with better uniformity. The dry powder mixture of the electrode slurry is made by mixing positive or negative electrode active materials, conductive agents and binders. Preferably, a thickener is also added. After adding the thickener, the solid components in the electrode slurry obtained by mixing the dry powder mixture of the electrode slurry with the solvent are not easy to settle.

[0117] The positive electrode active material includes lithium iron phosphate (LiFePO4), with a density of 1.523 g / cm³. 3 Alternatively, a lithium-nickel-cobalt-manganese ternary cathode active material with a density of 2.3 g / cm³. 3 Negative electrode active materials include graphite and silicon-based materials. Conductive agents include conductive carbon black (SP), superconducting carbon black, vapor-grown carbon fiber (VGCF), or graphene, where SP has a density of 3.0 g / cm³. 3 The binder includes polyvinylidene fluoride (PVDF), which has a density of 1.78 g / cm³. 3 The thickener includes sodium carboxymethyl cellulose (CMC), which has a density of 0.7 g / cm³. 3 Solvents include water, N-methylpyrrolidone, etc.

[0118] In the manufacturing process of electrode slurry for lithium-ion batteries, the preparation method of positive electrode slurry or negative electrode slurry includes: first, mixing positive electrode active material or negative electrode active material, conductive agent, binder and thickener to obtain electrode dry powder mixture; then mixing electrode dry powder mixture with solvent to obtain electrode slurry.

[0119] The manufacturing process of electrode slurries involves a series of processes, including mixing, dissolving, and dispersing liquids with liquids and liquids with solids, all of which are accompanied by changes in temperature, viscosity, and environment. In the preparation of positive or negative electrode slurries, the dispersion and uniformity of particulate active materials (such as positive or negative electrode active materials) directly affect the movement of lithium ions between the two electrodes. Therefore, the mixing and dispersion of electrode slurries for each electrode is crucial in lithium-ion battery production. The quality of electrode slurry dispersion directly impacts the quality of subsequent lithium-ion battery production and the performance of the final product.

[0120] In the current electrode slurry manufacturing process, it is impossible to detect the uniformity of the electrode dry powder mixture in real time. The uniformity of the electrode dry powder mixture can only be defined by the mixing time, which means that the electrode slurry can only be tested after it is manufactured, and its mixing uniformity cannot be guaranteed. Moreover, if the electrode dry powder mixture is not mixed uniformly, it will affect the consistency of the battery's internal resistance, capacity and other electrochemical performance, thus causing problems such as poor pressure differential consistency in the application of power batteries in electric vehicles.

[0121] In this embodiment, the uniformity of the electrode dry powder mixture is detected in real time using an electrode slurry mixing uniformity detection device. After confirming that the uniformity of the electrode dry powder mixture is qualified, a solvent is added to mix and obtain the electrode slurry. This ensures the uniformity of the electrode slurry and does not affect the consistency of the battery's internal resistance, capacity, and other electrochemical performance, thus avoiding the problem of poor voltage difference consistency in power batteries.

[0122] refer to Figure 3 In a second aspect, the present invention provides a material mixing system 200, wherein the material mixing device includes the material mixing uniformity detection device 100 described in any embodiment of the present application.

[0123] Specifically, the material mixing system 200 provided in this application embodiment uses the material mixing uniformity detection device 100 provided in any embodiment of this application to detect the mixing uniformity of the material, which can ensure that the material can be mixed more uniformly.

[0124] In some implementations, reference Figure 3 The material mixing system 200 further includes a mixing unit 210, which mixes materials at a preset mass ratio to obtain a mixture.

[0125] Specifically, the mixing unit 210 mixes materials at a preset mass ratio to obtain a mixture, which is then collected by the subsequent acquisition unit 110 for uniformity detection.

[0126] In some embodiments, the mixing unit 210 includes a stirrer or mixer; wherein,

[0127] The mixer includes a mixing tank, a mixing shaft, and a first driving device. The output end of the first driving device is connected to the mixing shaft. The first driving device drives the mixing shaft to rotate and stir inside the mixing tank, so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture.

[0128] The mixer includes a mixing tank and a second driving device. The second driving device drives the mixing tank to rotate so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture.

[0129] Specifically, the mixing unit 210 includes a mixer or a blender. The mixer includes a mixing tank, a stirring shaft, and a first drive device, such as a motor. At least two materials with a preset mass ratio are placed into the mixing tank, and the first drive device drives the stirring shaft to rotate, thereby achieving the mixing operation of the materials in the mixing tank. The stirring shaft may be equipped with stirring blades to improve the mixing effect.

[0130] The mixer is a high-speed dispersing mixer. It first removes some gas from the powder under vacuum conditions and disperses it into a diffuse state. Then, it enters a fast-flowing liquid, so that the powder is quickly wetted and dispersed into the liquid. Then, the dispersion liquid is subjected to high-intensity shearing by a dispersion module composed of impellers and baffles to obtain a high-quality slurry with uniform dispersion.

[0131] The mixer includes a mixing tank and a second drive device, such as a motor. At least two materials with a preset mass ratio are placed into the mixing tank, and the second drive device drives the mixing tank to rotate, so as to realize the mixing operation of the materials in the mixing tank.

[0132] In some implementations, reference Figure 4 The mixing unit 210 has a discharge port, and a second connecting pipe 160 is provided between the discharge port of the mixing unit 210 and the inlet of the collection unit 110. A second valve 161 is provided on the second connecting pipe 160.

[0133] Specifically, the discharge port of the mixing unit 210 and the inlet of the collection unit 110 are connected by a second connecting pipe 160. A second valve 161 is installed on the second connecting pipe 160 at one end near the mixing unit 210, or at one end near the storage tank 111, or at the middle of the second connecting pipe 160. By controlling the second valve 161 to open, the mixing unit 210 and the storage tank 111 are connected. By controlling the second valve 161 to close, the mixing unit 210 and the storage tank 111 are disconnected.

[0134] In some embodiments, the second valve 161 is an electric valve.

[0135] Specifically, the second valve 161 is an electric valve, enabling automated control. Before the collection unit 110 collects the mixture from the mixing unit 210, the first valve 151 and the second valve 161 are closed, creating a sealed cavity within the storage tank 111. A negative pressure is created within the storage tank 111 via the pressure regulating component, opening the second valve 161 and drawing the mixture from the mixing unit 210 into the storage tank 111. After some mixture is drawn in, the second valve 161 is closed, the pressure regulating component stops, and the weighing unit 130 weighs the mixture drawn into the storage tank 111. After weighing, the pressure regulating component adjusts the pressure within the storage tank 111 to create a positive pressure, opening the first valve 151. Under this positive pressure, the mixture is discharged to the separation unit 120 for separation. Through the coordination of the first valve 151, the second valve 161, and the pressure regulating component, automatic collection and conveying of the mixture are achieved.

[0136] refer to Figure 5 A third aspect of the present invention provides a method for detecting the uniformity of material mixing, comprising:

[0137] S320: Separate the pre-collected mixture to obtain the separated materials;

[0138] Specifically, the mixture is obtained by mixing at least two materials in a preset mass ratio, and the pre-collected mixture is separated by a separation unit 120 to obtain the separated materials.

[0139] S330: Obtain the mass of the pre-collected mixture and the mass of each separated material;

[0140] Specifically, the weighing unit 130 is used to obtain the mass of the pre-collected mixture and the mass of each separated material. There are two ways to obtain the mass of the pre-collected mixture: one is to weigh the pre-collected mixture before separation; the other is to weigh each separated material separately and then sum the masses of the separated materials to obtain the mass of the mixture.

[0141] S340: Based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material after separation, output the detection information of the uniformity of the mixture.

[0142] Specifically, the uniformity detection unit 140 outputs the uniformity detection information of the mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material after separation.

[0143] The material mixing uniformity detection method of this application is simple and easy to implement, and can detect the uniformity of the mixture in real time online.

[0144] It is understood that the material mixing uniformity detection device 100 described in any embodiment of this application is used to perform the material mixing uniformity detection method provided in each embodiment of this application. Therefore, the technical effect of the material mixing uniformity detection method is the same as that of the material mixing uniformity detection device 100, and will not be described again in this application.

[0145] In some implementations, S340 specifically includes:

[0146] The initial proportion of each material in the mixture is determined according to the preset mass ratio of the mixture;

[0147] Based on the mass of the pre-collected mixture and the mass of each material after separation, determine the target proportion of each material in the mixture;

[0148] If the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, then the uniformity of the mixture is output as qualified.

[0149] Specifically, the criteria for judging the uniformity of the mixture are as described above, and will not be repeated in the embodiments of this application.

[0150] In some implementations, reference Figure 5 Prior to S320, it also included:

[0151] S310: Pre-collect the mixture.

[0152] Specifically, the acquisition unit 110 uses negative pressure to pre-acquire a portion of the mixture. The mass of the pre-acquired mixture accounts for 0.5% to 1.5% of the total mass of the mixture (the mixture obtained by mixing according to a preset mass ratio), preferably 1%. The pre-acquired mixture is then transported to the separation unit 120 using negative pressure to achieve automatic acquisition, weighing, separation, and uniformity detection and evaluation of the mixture.

[0153] A fourth aspect of the present invention provides a material mixing method, the material mixing method comprising:

[0154] Mix at least two materials in a preset mass ratio to obtain a mixture;

[0155] The mixture is pre-collected, and the uniformity detection method for material mixing described in any embodiment of this application is used to detect the uniformity of the pre-collected mixture. If the detection information indicating that the uniformity of the mixture is qualified is output, the material mixing is stopped; otherwise, the material with the preset mass ratio is controlled to continue mixing.

[0156] Specifically, at least two materials with a preset mass ratio are placed into the mixing unit 210 and mixed to obtain a mixture; the collection unit 110 collects the mixture and uses the material mixing uniformity detection device 100 or the material mixing uniformity detection method provided in any embodiment of this application to perform uniformity detection on the collected mixture. If the output of the detection information that the uniformity of the mixture is qualified is output, the material mixing is stopped, indicating that the uniformity of the mixture has met the standard.

[0157] In some implementations, the mixture is pre-collected at a preset time and its uniformity is tested. If the uniformity of the mixture is found to be unqualified, the material at the preset mass ratio is controlled to continue mixing for a preset time, and the mixture is collected again and its uniformity is tested until the uniformity of the mixture is found to be qualified.

[0158] Specifically, if the uniformity of the tested mixture is deemed unqualified, the mixture is stirred for a preset time, and then sampled again for uniformity testing until the uniformity of the tested mixture is qualified. Those skilled in the art can set the preset time according to actual needs; the preset time can be any value between 10 and 30 minutes, such as 15 minutes, 20 minutes, or 30 minutes.

[0159] The system allows users to set preset times on the touchscreen, such as detecting and recording data every 20 minutes, 40 minutes, and 60 minutes. The recorded data is compared with the data specified in the process specifications. If the uniformity is satisfactory, stirring stops; otherwise, stirring continues. The recorded data includes the pre-collected mass of the mixture, the mass of each material separated by the separation unit 120, and the calculated target proportion of each material. The process specifications include the initial proportion of each material in the mixture.

[0160] In some embodiments, mixing at least two materials in a preset mass ratio to obtain a mixture includes:

[0161] The raw materials for preparing the electrode slurry are mixed according to a preset mass ratio to obtain an electrode dry powder mixture; wherein, the electrode slurry includes a positive electrode slurry or a negative electrode slurry; the raw materials for preparing the electrode slurry include at least: positive or negative electrode active materials, conductive agents, binders, and preferably also thickeners.

[0162] Specifically, the material mixing method of this application is applicable to the production of electrode slurry. First, the positive or negative electrode active material, conductive agent, binder, and thickener are mixed according to a preset mass ratio to obtain an electrode dry powder mixture. The electrode dry powder mixture is collected, and its uniformity is monitored in real time. If the uniformity of the electrode dry powder mixture is qualified, it is mixed with a solvent to obtain the electrode slurry. Therefore, in the preparation process of the electrode slurry, after confirming that the uniformity of the electrode dry powder mixture is qualified, the solvent is added to obtain the electrode slurry. This ensures the uniformity of the electrode slurry and does not affect the consistency of the battery's internal resistance, capacity, and other electrochemical performance, avoiding the problem of poor voltage differential consistency in power batteries.

[0163] Example 1

[0164] Taking the material mixing uniformity testing device 100 to test the uniformity of the positive electrode dry powder mixture of positive electrode slurry as an example, the material mixing uniformity testing method includes:

[0165] The positive electrode active material LiFePO4, conductive agent SP, thickener CMC and binder PVDF are added into a mixer according to a preset mass ratio and mixed for 20 minutes to obtain a positive electrode dry powder mixture; wherein, the mass ratio of positive electrode active material is 96.32%, the mass ratio of binder is 1.84%, and the mass ratio of conductive agent is 1.84%.

[0166] With the first valve 151 and the second valve 161 closed, the negative pressure valve 1121 is opened. The exhaust fan 112 draws air out of the storage tank 111, creating a negative pressure inside. The PLC controller then opens the second valve 161, drawing the mixture from the mixer into the storage tank 111 under this negative pressure. Once the mixture in the storage tank 111 reaches a set mass, the second valve 161 and the negative pressure valve 1121 are closed to prevent the mixture from returning to the mixer. The mass of the mixture drawn into the storage tank 111 is 1% of the preset mass of the mixture added to the mixer.

[0167] The weighing unit 130 weighs the mixture collected in the storage tank 111 and the storage tank 111 as a whole. By removing the weight of the storage tank 111, the mass of the pre-collected mixture can be obtained.

[0168] When the weighing unit 130 finishes weighing, that is, when the weight information obtained by the weighing unit 130 reaches a stable state, the positive pressure valve 1131 is opened and the air compressor 113 inflates the storage tank 111 to form a positive pressure in the storage tank 111. The first valve 151 is opened and the mixture in the storage tank 111 is discharged into the gravity separator by the positive pressure. When the weight obtained by the weighing unit 130 is equal to the mass of the storage tank 111, it means that the mixture in the storage tank 111 has been completely discharged into the gravity separator. The first valve 151 and the positive pressure valve 1131 are then closed.

[0169] In a gravity separator, materials with different densities in the positive electrode dry powder mixture are separated. Weighing unit 130 is used to weigh each separated material to obtain its mass. The gravity separator can separate the positive electrode active material LiFePO4, conductive agent SP, thickener CMC, and binder PVDF.

[0170] Based on the mass of each separated material and the mass of the pre-collected mixture, the target proportion of each separated material is determined. This is achieved by dividing each separated material by the mass of the pre-collected mixture.

[0171] If the difference between the target proportions of the positive electrode active material LiFePO4, the conductive agent SP, and the binder PVDF and the initial proportions of the corresponding materials is within the proportion threshold range [-1%, 1%], then the output will show that the uniformity of the positive electrode dry powder mixture is qualified.

[0172] Example 2

[0173] The method for detecting the uniformity of material mixing in this embodiment is the same as that in Example 1. The difference is that this embodiment detects the uniformity of the negative electrode dry powder mixture of the negative electrode slurry. In the electrode dry powder mixture of the negative electrode slurry, the mass ratio of the negative electrode active material is 95%, the mass ratio of the binder is 1.35%, the mass ratio of the conductive agent is 2.65%, and the mass ratio of the thickener is 1%.

[0174] Example 3

[0175] A material mixing method for producing positive electrode slurry, comprising the material mixing uniformity detection method described in Example 1, and further comprising the following steps:

[0176] If the uniformity of the positive electrode dry powder mixture is qualified, the mixer is stopped and the well-mixed positive electrode dry powder mixture is mixed with solvent water to obtain the positive electrode slurry.

[0177] If the uniformity of the positive electrode dry powder mixture fails the test, the mixer should continue mixing for 20 minutes, and the uniformity test should be performed again until the uniformity of the mixture passes the test. Repeat the above steps. If the uniformity of the mixture still fails after the mixer has reached the time threshold, additional material should be added to the mixer. The time threshold can be set according to actual conditions, such as 1 hour, 1.2 hours, or 1.6 hours.

[0178] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A material uniformity detection device (100), characterized in that, include: The separation unit (120) separates the pre-collected mixture; wherein the mixture is an electrode dry powder mixture, and the separation unit is a gravity separator; At least one weighing unit (130) acquires the mass of the pre-collected mixture and the mass of each material separated by the separation unit (120); The uniformity detection unit (140) outputs the uniformity detection information of the mixture based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material separated by the separation unit (120); wherein each material is one of the positive or negative electrode active material, conductive agent, binder, and thickener. A collection unit (110) collects the mixture and transports the collected mixture to the separation unit (120). The collection unit (110) includes a storage tank (111) and a pressure regulating component. The storage tank (111) has an inlet and an outlet. The pressure regulating component adjusts the pressure inside the storage tank (111) to form a negative pressure so that the mixture is drawn into the storage tank (111) from the inlet; and adjusts the pressure inside the storage tank (111) to form a positive pressure so that the mixture inside the storage tank (111) is discharged into the separation unit (120) from its own outlet.

2. The material mixing uniformity detection device (100) according to claim 1, characterized in that, The uniformity detection unit (140): Based on the initial proportion and target proportion of each material in the mixture, the uniformity detection information of the mixture is output: if the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, the uniformity detection information of the mixture is qualified is output. The initial proportion of each material in the mixture is determined according to the preset mass ratio of the mixture; the target proportion of each material in the mixture is determined according to the mass of the pre-collected mixture and the mass of each material separated by the separation unit (120).

3. The material mixing uniformity detection device (100) according to claim 1, characterized in that, The outlet of the storage tank (111) is connected to the inlet of the separation unit (120) by a first connecting pipe (150), and a first valve (151) is provided on the first connecting pipe (150).

4. The material mixing uniformity detection device (100) according to claim 3, characterized in that, The first valve (151) is an electric valve.

5. The material mixing uniformity detection device (100) according to any one of claims 1-4, characterized in that, The pressure regulating assembly includes an exhaust fan (112) and an inflation fan (113), and the storage tank (111) is provided with at least one gas port; wherein, The exhaust fan (112) draws the gas in the storage tank (111) out of the gas port to create a negative pressure inside the storage tank (111); The air inflator (113) inflates the storage tank (111) through the gas port to create a positive pressure inside the storage tank (111).

6. The material mixing uniformity detection device (100) according to claim 1, characterized in that, The weighing unit (130) includes: The first weighing device (131) obtains the mass of the pre-collected mixture, or obtains the total mass of the materials separated by the separation unit (120); The second weighing device (132) obtains the mass of each material separated by the separation unit (120).

7. The material mixing uniformity detection device (100) according to claim 6, characterized in that, The first weighing device (131) is located outside the storage tank (111). The first weighing device (131) acquires the total weight information of the storage tank (111) and the pre-collected mixture inside the storage tank (111), and obtains the mass of the pre-collected mixture based on the pre-collected mass information of the storage tank (111). Alternatively, the first weighing device (131) is disposed inside the storage tank (111), the first weighing device (131) has a receiving part that matches the shape of the storage tank (111), the receiving part receives the mixture inside the storage tank (111), and the first weighing device (131) obtains the mass of the mixture received by the receiving part; Alternatively, the first weighing device (131) obtains the mass of each material separated by the separation unit (120) and sums the masses of each material to obtain the total mass of each material separated by the separation unit (120).

8. The material mixing uniformity detection device (100) according to claim 6, characterized in that, The separation unit (120) is provided with at least one discharge port; Each outlet of the separation unit (120) is provided with a second weighing device (132), or at least some outlets of the separation unit (120) are provided with a second weighing device (132).

9. The material mixing uniformity detection device (100) according to claim 1, characterized in that, The material mixing uniformity detection device (100) includes an electrode slurry mixing uniformity detection device; The mixture is a solid.

10. A material mixing system (200), characterized in that, The material mixing device includes the material mixing uniformity detection device (100) according to any one of claims 1-9.

11. The material mixing system (200) according to claim 10, characterized in that, The material mixing system (200) further includes a mixing unit (210), which mixes materials at a preset mass ratio to obtain a mixture.

12. The material mixing system (200) according to claim 11, characterized in that, The mixing unit (210) includes a stirrer or a mixer; wherein, The mixer includes a mixing tank, a mixing shaft, and a first driving device. The output end of the first driving device is connected to the mixing shaft. The first driving device drives the mixing shaft to rotate and stir inside the mixing tank, so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture. The mixer includes a mixing tank and a second driving device. The second driving device drives the mixing tank to rotate so as to mix the materials in the mixing tank at a preset mass ratio to obtain a mixture.

13. The material mixing system (200) according to claim 11, characterized in that, The mixing unit (210) has a discharge port, and a second connecting pipe (160) is provided between the discharge port of the mixing unit (210) and the inlet of the collection unit (110), and a second valve (161) is provided on the second connecting pipe (160).

14. The material mixing system (200) according to claim 13, characterized in that, The second valve (161) is an electric valve.

15. A method for detecting the uniformity of material mixing, characterized in that, The detection method is implemented based on the material mixing uniformity detection device (100) according to any one of claims 1-9, and the detection method includes: The pre-collected mixture is separated to obtain the separated materials; Obtain the mass of the pre-collected mixture, and obtain the mass of each separated material; Based on the preset mass ratio of the mixture, the mass of the pre-collected mixture, and the mass of each material after separation, the uniformity detection information of the mixture is output.

16. The method for detecting the uniformity of material mixing according to claim 15, characterized in that, The step of outputting detection information on the uniformity of the mixture based on the preset mass ratio of the mixture, the pre-collected mass of the mixture, and the mass of each material after separation includes: The initial proportion of each material in the mixture is determined according to the preset mass ratio of the mixture; Based on the mass of the pre-collected mixture and the mass of each material after separation, determine the target proportion of each material in the mixture; If the difference between the initial proportion of at least some materials in the mixture and the target proportion of the corresponding materials is within the proportion threshold range, then the uniformity of the mixture is output as qualified.

17. A method for mixing materials, characterized in that, The material mixing method includes: Mix at least two materials in a preset mass ratio to obtain a mixture; The mixture is pre-collected, and the uniformity of the mixture is tested using the material mixing uniformity detection method described in claim 15 or 16. If the output shows that the uniformity of the mixture is qualified, the material mixing is stopped; otherwise, the material is mixed at the preset mass ratio.

18. The material mixing method according to claim 17, characterized in that, The mixture is pre-collected at a preset time, and the uniformity of the mixture is detected. If the output shows that the uniformity of the mixture is unqualified, the material at the preset mass ratio is controlled to continue mixing for a preset time, and the mixture is collected again and the uniformity is detected until the output shows that the uniformity of the mixture is qualified.

19. The material mixing method according to claim 18, characterized in that, The process of mixing at least two materials in a preset mass ratio to obtain a mixture includes: The raw materials for preparing electrode slurry are mixed according to a preset mass ratio to obtain electrode dry powder mixture.

20. The material mixing method according to claim 17, characterized in that, If the output shows that the uniformity of the mixture is qualified, then the mixture is mixed with a solvent to obtain an electrode slurry.

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