A pole piece surface density coating control method, device, system and storage medium

Abstract

The application provides an electrode sheet surface density coating control method, device, system and storage medium, and relates to the technical field of lithium ion battery electrode sheet coating control. The electrode sheet surface density coating control method comprises the following steps: obtaining test data of target slurry; determining a spacing function relationship between the viscosity of the target slurry, the slurry density and the roller coating spacing between a coating roller and a backing roller; obtaining the current viscosity and the current slurry density in real time; calculating the current roller coating spacing of the current viscosity and the current slurry density according to the spacing function relationship and performing coating. The control method provided by the application can realize the spacing between the coating roller and the backing roller for the slurry viscosity and the slurry density of the target slurry, and the coating thickness can be adjusted in real time through the spacing, so that the uniformity and stability of the electrode sheet surface density in the coating process are ensured, and the preparation of the electrode sheet of the lithium ion battery is facilitated.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery electrode coating control technology, and more specifically, to an electrode surface density coating control method, apparatus, system, and storage medium. Background Technology

[0002] Lithium-ion batteries are the most widely used commercially available rechargeable batteries globally, and with their continuous development, the demand for lithium-ion batteries is growing rapidly. The areal density of the positive and negative electrode sheets is a crucial factor affecting the capacity density of lithium-ion batteries. Therefore, low areal density consistency of the electrode sheets leads to reduced capacity consistency, which in turn reduces the performance of the battery pack. Thus, improving the consistency of electrode areal density is of paramount importance.

[0003] In the field of lithium battery manufacturing technology, coating machines are common equipment. Positive and negative electrode materials need to be coated onto conductive current collectors. This process is typically completed using a coating machine, which uniformly coats the electrode materials onto the conductive current collector to form electrode sheets. Coating is a crucial step affecting the areal density of the electrode sheets. As coating progresses, the solid content and viscosity of the slurry continuously increase, leading to variations in slurry density and potentially uneven coating. Therefore, optimizing the coating process is one of the effective means to improve the areal density of the electrodes.

[0004] Patent CN219043428U proposes a slurry conveying device and a slurry mixing device. By continuously stirring the pre-coated slurry, it prevents unevenness caused by excessive static time, thereby ensuring the uniformity of slurry coating. Although this method can maintain the uniformity of the slurry to a certain extent, it cannot guarantee the current coating thickness and surface density during coating, resulting in poor accuracy, cumbersome method, and low efficiency.

[0005] Patent CN112916327A discloses a coating system for double-sided coating. A first correction unit and a second correction unit are respectively located upstream of the first coating unit and the second coating unit. A CCD camera is used to capture the coating state of the electrode sheets, and the working states of components such as the screw pump and coating die are adjusted according to the coating state to achieve adjustment of coating uniformity. This method monitors the current coating state through image processing technology, but it cannot ensure accurate control of the actual areal density of the material being coated in real time.

[0006] In summary, existing methods for monitoring the surface density of the slurry on the electrode during the coating process are cumbersome, have low monitoring efficiency, cannot ensure the precise state of the slurry after coating in real time, and result in large deviations and low accuracy, causing great inconvenience to the production of lithium-ion batteries. Summary of the Invention

[0007] In view of the above, and to address the aforementioned technical problems, the present invention provides a method for controlling the surface density coating of electrode sheets, comprising:

[0008] Obtain test data for the target slurry;

[0009] Based on the test data, the viscosity and density of the target slurry and the spacing function relationship between the coating roller and the back roller are determined.

[0010] The current viscosity and density of the target slurry are obtained in real time.

[0011] Based on the spacing function relationship, the current roller spacing corresponding to the current viscosity and the current slurry density is calculated, and the coating machine is controlled to perform coating at the current roller spacing.

[0012] Preferably, acquiring test data for the target slurry includes:

[0013] Under preset duration and preset time interval conditions, the viscosity data and solid content data of the target slurry are continuously sampled and tested; the viscosity data and solid content data measured at each time interval within the preset duration are taken as a set of measured values, and all sets of measured values ​​within the preset duration are taken as the test data;

[0014] Preferably, the preset duration is not less than 3 hours;

[0015] Preferably, the preset time interval is no more than 20 seconds;

[0016] Preferably, the number of groups of measured values ​​is not less than 540.

[0017] Preferably, determining the distance function relationship between the viscosity and density of the target slurry and the distance between the coating roller and the back roller based on the test data includes:

[0018] Based on the test data, a functional relationship between the solid content and viscosity of the target slurry is established as the first functional relationship;

[0019] Establish a functional relationship between the solid content, slurry density, coating surface density of the target slurry and the roller spacing, as a second functional relationship;

[0020] Based on the first functional relationship and the second functional relationship, a functional relationship between the roller coating spacing and the viscosity and density of the target slurry is established as the spacing functional relationship.

[0021] Preferably, the first functional relationship is as follows:

[0022] ω=f(x 浆 );

[0023] Where ω represents the solid content of the target slurry; x 浆 This represents the viscosity of the target slurry.

[0024] Preferably, the functional relationship of the second functional relationship is obtained by the following method:

[0025] According to the coating surface density ρ of the target slurry 涂布 Based on the solid content ω, the first formula for calculating the surface density of the slurry is derived:

[0026] According to the slurry density y 浆 The surface density ρ of the slurry is calculated by using the current roller spacing d. 浆面 The second calculation formula: ρ 浆面 =y 浆 ×d;

[0027] Based on the first calculation formula and the second calculation formula, the functional relationship of the second functional relationship can be obtained.

[0028] Preferably, the second functional relationship is as follows:

[0029] d=g(ω,y 浆 );

[0030] Where d represents the current roller spacing; ω represents the solid content of the target slurry; y 浆 The slurry density represents the target slurry.

[0031] Preferably, the functional relationship of the spacing function is as follows:

[0032] d=F(x 浆 ,y 浆 );

[0033] Where d represents the current roller spacing; x 浆 y represents the viscosity of the target slurry; 浆 The slurry density represents the target slurry.

[0034] Furthermore, to address the aforementioned problems, the present invention also provides an electrode surface density coating control device, comprising:

[0035] The acquisition module is used to acquire test data for the target slurry;

[0036] The analysis module is used to determine the relationship between the viscosity and density of the target slurry and the spacing function between the coating roller and the back roller, based on the test data.

[0037] The acquisition module is also used to acquire the current viscosity and current density of the target slurry in real time;

[0038] The calculation module is used to calculate the current roller spacing corresponding to the current viscosity and the current slurry density according to the spacing function relationship, and control the coating machine to perform coating at the current roller spacing.

[0039] In addition, to solve the above problems, an electrode surface density coating control system includes a memory and a processor. The memory stores an electrode surface density coating control program, and the processor runs the electrode surface density coating control program to make the electrode surface density coating control system perform the electrode surface density coating control method as described above.

[0040] In addition, to solve the above problems, a computer-readable storage medium is provided, wherein an electrode surface density coating control program is stored on the computer-readable storage medium, and the electrode surface density coating control program, when executed by a processor, implements the electrode surface density coating control method as described above.

[0041] This invention provides a method, apparatus, system, and storage medium for controlling the surface density of coated electrodes. The method includes: acquiring test data for a target slurry; determining, based on the test data, the spacing function relationship between the viscosity and density of the target slurry and the spacing between the coating roller and the back roller; acquiring the current viscosity and density of the target slurry in real time; calculating the current coating spacing corresponding to the current viscosity and density based on the spacing function relationship; and controlling the coating machine to perform coating at the current coating spacing. This invention provides a method to improve the uniformity of coated electrode surface density for comma-type coating machines. It uses an online viscometer to monitor the slurry viscosity and density in real time, determines the spacing function relationship, and obtains the slurry coating thickness required for the target surface density based on the spacing function relationship. The uniformity of the coating surface density is achieved by adjusting the spacing between the coating roller and the back roller to adjust the coating slurry thickness. The control method provided by this invention can obtain the required distance between the coating roller and the back roller based on the current viscosity and density of the target slurry during the current coating process, and adjust the coating thickness in real time through this distance, thereby ensuring that the electrode surface density remains uniform and stable during the coating process. The method is simple, highly accurate, greatly reduces manufacturing costs, improves product quality, and provides convenience for the preparation of electrodes for lithium-ion batteries. Attached Figure Description

[0042] Figure 1This is a schematic diagram of the hardware operating environment involved in an embodiment of the electrode surface density coating control method of the present invention;

[0043] Figure 2 This is a schematic flowchart of the first embodiment of the electrode surface density coating control method of the present invention;

[0044] Figure 3 This is a schematic flowchart of the second embodiment of the electrode surface density coating control method of the present invention;

[0045] Figure 4 This is a detailed flowchart of step S200 in the third embodiment of the electrode surface density coating control method of the present invention;

[0046] Figure 5 This is a schematic diagram comparing the specific capacity-voltage curves of Kuraray hard carbon products with the coating method of this embodiment in the fourth embodiment of the electrode surface density coating control method of the present invention.

[0047] Figure 6 This is a schematic diagram of the module connection of the electrode surface density coating control device of the present invention.

[0048] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0050] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0053] like Figure 1 The diagram shown is a structural schematic of the hardware operating environment of the terminal involved in an embodiment of the present invention.

[0054] The electrode surface density coating control system of this invention can be a PC, or a mobile terminal device such as a smartphone, tablet computer, or portable computer. This electrode surface density coating control system may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen, an input unit such as a keyboard, or a remote control; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a stable memory, such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001. Optionally, the electrode surface density coating control system may also include RF (Radio Frequency) circuitry, audio circuitry, a Wi-Fi module, etc. In addition, the electrode surface density coating control system can also be equipped with other sensors such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, which will not be described in detail here.

[0055] Those skilled in the art will understand that Figure 1 The electrode surface density coating control system shown is not intended to limit it and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Figure 1 As shown, the memory 1005, which is a computer-readable storage medium, may include an operating system, a data interface control program, a network connection program, and an electrode surface density coating control program.

[0056] In summary, the control method provided by this invention can obtain the required spacing between the coating roller and the back roller based on the current viscosity and density of the target slurry during the current coating process, and adjust the coating thickness in real time using this spacing, thereby ensuring that the electrode surface density remains uniform and stable during the coating process. The method is simple, highly accurate, greatly reduces manufacturing costs, improves product quality, and provides convenience for the preparation of electrodes for lithium-ion batteries.

[0057] Example 1:

[0058] Reference Figure 2 This embodiment provides a method for controlling the surface density coating of electrode sheets, including:

[0059] Step S100: Obtain test data for the target slurry;

[0060] The aforementioned target slurry is a mixture used in the coating process of lithium-ion battery manufacturing, primarily a mixture of positive and / or negative electrode materials. Specifically, the positive electrode slurry typically consists of positive electrode active materials (such as lithium cobalt oxide, lithium nickel oxide, etc.), conductive agents (such as carbon black), binders, and solvents. The negative electrode slurry contains negative electrode active materials (such as graphite), conductive agents, binders, and solvents.

[0061] The formulations of the positive and negative electrode slurries vary depending on the specific battery design and application requirements. For example, in high-energy-density batteries, positive and negative electrode materials with high specific capacity may be used to increase the battery's capacity. Simultaneously, to improve the battery's cycle life and safety performance, additives or coating aids, such as viscosity modifiers, thickeners, and solubilizers, may be added to improve the flowability and uniformity during the coating process.

[0062] Furthermore, the formulation of the coating slurry is protected by the manufacturer's patents, so the specific formulation details may vary. Each battery manufacturer has its own unique formulation and process to meet the performance and quality requirements of its products.

[0063] Different slurries may have different components, concentrations, and densities, resulting in different physicochemical properties.

[0064] Therefore, before controlling the areal density of a target slurry during coating, it is necessary to obtain and calculate its basic state, physicochemical properties, and other parameters in order to more accurately determine the coating method corresponding to that target slurry.

[0065] Test data is a set of data representing the physicochemical properties of the target slurry, obtained through repeated testing. This data may include, but is not limited to, slurry density, flowability, viscosity, composition, temperature, humidity, mass, volume, etc., and is used to determine the following functional relationship. The more test data in the dataset, the more accurate the determined functional relationship will be.

[0066] Step S200: Based on the test data, determine the distance function relationship between the viscosity and density of the target slurry and the distance between the coating roller and the back roller.

[0067] The test data mentioned above may include parameters such as the viscosity and density of the target slurry.

[0068] By using the data set obtained from the test data, the functional relationship between viscosity, slurry density, and the roll spacing between the coating roller and the back roller can be determined based on a large amount of test data.

[0069] This embodiment is for a comma-type coating machine. During coating, the spacing between the coating roller and the back roller can be controlled to affect the surface density of the slurry coating, thereby achieving control over the surface density of the coating.

[0070] Step S300: Obtain the current viscosity and current density of the target slurry in real time;

[0071] Step S400: Calculate the current roller spacing corresponding to the current viscosity and the current slurry density according to the spacing function relationship, and control the coating machine to perform coating at the current roller spacing.

[0072] As described above, after determining the functional relationship, during the processing and preparation using a coating machine, real-time test data corresponding to the current target slurry, including the current viscosity and current slurry density, is obtained through the detection equipment. This data is then substituted into the spacing functional relationship to obtain the corresponding current roller coating spacing. Subsequently, the spacing between the coating roller and the back roller of the coating machine is adjusted to reach the current roller coating spacing, thereby enabling coating to be performed at the current roller coating spacing. This achieves real-time adjustment and control of the electrode surface density by adjusting the current roller coating spacing based on the physicochemical parameters of the target slurry obtained through real-time measurement.

[0073] This embodiment provides a method to improve the uniformity of coating electrode surface density for comma-type coating machine roller coating. It uses an online viscometer to monitor the slurry viscosity and density in real time, determines the spacing function relationship, and obtains the slurry coating thickness required for the target surface density based on the spacing function relationship. The uniformity of coating surface density is achieved by adjusting the spacing between the coating roller and the back roller to adjust the coating slurry thickness.

[0074] The control method provided in this embodiment can obtain the required distance between the coating roller and the back roller based on the current viscosity and density of the target slurry during the current coating process, and adjust the coating thickness in real time using this distance, thereby ensuring that the electrode surface density remains uniform and stable during the coating process. The method is simple, highly accurate, greatly reduces manufacturing costs, improves product quality, and provides convenience for the preparation of lithium-ion battery electrodes.

[0075] Example 2:

[0076] Reference Figure 3 The second embodiment of the present invention provides a method for controlling the surface density coating of electrodes. Based on the above embodiment 1, step S100, obtaining test data for the target slurry, includes:

[0077] Step S110: Under the conditions of preset duration and preset time interval, continuously sample and test the viscosity data and solid content data in the test data of the target slurry; take the viscosity data and solid content data measured at each time interval within the preset duration as a set of measured values, and take all the measured values ​​within the preset duration as the test data;

[0078] Furthermore, the preset duration is ≥3 hours;

[0079] Furthermore, the preset time interval is ≤20 seconds;

[0080] Furthermore, the number of groups of measured values ​​is ≥540.

[0081] In order to ensure a more accurate functional relationship in the further determination of the spacing function, it is necessary to conduct multiple data tests on the target slurry to obtain multiple sets of test data.

[0082] Within a certain preset time period, sampling is required at each preset time interval to obtain the viscosity data and solid content data of the target slurry. The data obtained at each preset time interval is used as a set of measurement values, and multiple sets of measurement values ​​are combined to form the test data.

[0083] In this embodiment, the preset duration can be no less than 3 hours, for example, set to 3 hours; the preset time interval can be set to collect data once every 20 seconds; within the preset duration, the number of sets of measured values ​​obtained from data collection can be 540 sets.

[0084] Example 3:

[0085] Reference Figure 4 The third embodiment of the present invention provides a method for controlling the surface density coating of electrode sheets. Based on the above embodiment 1, step S200, determining the spacing function relationship between the viscosity and density of the target slurry and the roller coating distance between the coating roller and the back roller based on the test data, includes:

[0086] Step S210: Based on the test data, establish a functional relationship between the solid content and viscosity of the target slurry, as the first functional relationship;

[0087] As described above, viscosity and density data are collected at preset time intervals within a preset time period through continuous sampling tests on the target slurry. Then, a functional relationship (the first functional relationship) between the solid content and viscosity of the target slurry is established based on these data. This functional relationship describes the effect of solid content on viscosity.

[0088] Step S220: Establish a functional relationship between the solid content, slurry density, coating surface density and the roller spacing of the target slurry, as a second functional relationship;

[0089] Based on the test data above, a functional relationship (second functional relationship) was established between the solid content, slurry density, coating surface density, and roller spacing of the target slurry. This functional relationship can describe the influence of solid content, slurry density, and coating surface density on the roller spacing.

[0090] Step S230: Based on the first functional relationship and the second functional relationship, establish a functional relationship between the roller coating spacing and the viscosity and density of the target slurry, as the spacing functional relationship.

[0091] Based on the first and second functional relationships described above, a functional relationship (spacing functional relationship) is established between the roll spacing and the viscosity and density of the target slurry. This functional relationship can be used to calculate the appropriate roll spacing corresponding to the current viscosity and density.

[0092] The advantage of the above-mentioned electrode surface density coating control method is that, by establishing a functional relationship, a suitable roller spacing can be calculated based on the current viscosity and density of the target slurry obtained in real time, and the coating machine can be controlled to perform coating at that spacing. This enables uniform distribution of the slurry and consistent coating thickness during the coating process, improving battery performance and quality.

[0093] The specific implementation method can employ mathematical modeling and data analysis to determine the functional relationships. By collecting a large amount of test data and performing statistical and regression analyses, suitable functional forms and parameters can be obtained. These functional relationships are then applied to the control system of the coating machine to calculate the current roller spacing in real time and make corresponding coating adjustments. The specific algorithms and implementation details may require customized design based on the specific coating machine model and slurry characteristics.

[0094] For example, suppose the following functional relationship is derived from the analysis of test data:

[0095] First functional relationship: Solid content = f(current viscosity);

[0096] Second functional relationship: Roller spacing = g(solid content, slurry density);

[0097] Then, based on the first and second functional relationships, a functional relationship (spacing functional relationship) is established between the roller spacing and the viscosity and density of the target slurry:

[0098] The roller spacing function relationship is: Roller spacing = h(current viscosity, current slurry density);

[0099] In practice, the appropriate roller spacing is calculated using a spacing function based on the real-time acquired viscosity and slurry density. Coating is then performed at this spacing by controlling the parameters of the coating machine. This allows for precise coating control based on the actual conditions of the target slurry.

[0100] Furthermore, in step S210, the first functional relationship is as follows:

[0101] ω=f(x 浆 );

[0102] Where ω represents the solid content of the target slurry; x 浆 This represents the viscosity of the target slurry.

[0103] As described above, after collecting a series of test data for the target slurry, a functional relationship between solid content and viscosity was established based on this data using appropriate mathematical methods (such as regression analysis). This function can be expressed as ω = f(x 浆 ), where ω represents the solid content of the target slurry, x 浆 This represents the viscosity of the target slurry.

[0104] This functional relationship allows us to calculate the corresponding solids content based on the viscosity value of the target slurry.

[0105] This step involves establishing an accurate functional relationship using experimental data. This allows for the prediction of the solids content based on the slurry's viscosity during coating, or vice versa. This functional relationship enables better control of the coating density and improves coating uniformity and quality.

[0106] To achieve this step, statistical analysis software or programming languages ​​can be used for data processing and function fitting. For example, the Scikit-learn library in Python or the curve fitting toolbox in MATLAB can be used to fit the functional relationship between solid content and viscosity.

[0107] Furthermore, in step S220, the functional relationship of the second functional relationship is obtained through the following method:

[0108] Step S221, based on the coating surface density ρ of the target slurry 涂布 Based on the solid content ω, the surface density ρ of the slurry can be calculated. 浆面 The first calculation formula:

[0109] Step S222, based on the slurry density y 浆 The surface density ρ of the slurry is calculated by using the current roller spacing d. 浆面The second calculation formula: ρ 浆面 =y 浆 ×d;

[0110] Step S223: Based on the first calculation formula and the second calculation formula, the functional relationship of the second functional relationship can be obtained.

[0111] First, based on the coating surface density and solid content of the target slurry, the first calculation formula is obtained, namely... Represents the surface density of the coating ρ 涂布 Solid content ω and slurry surface density ρ 浆面 The functional relationship.

[0112] Then, based on the slurry density y 浆 The second calculation formula ρ is obtained by combining the current roller spacing d with the current roller spacing. 浆面 =y 浆 ×d.

[0113] Finally, based on the results of the first and second calculation formulas, a functional relationship between solid content, slurry density, coating surface density, and roller spacing is established.

[0114] In this step, the appropriate roller spacing can be calculated based on the slurry density and coating surface density during the coating process, thereby achieving density coating control of the electrode surface and establishing the functional relationship.

[0115] To achieve this step, mathematical modeling and function fitting are required based on the specific coating equipment and material properties. Numerical computation software (such as MATLAB) or programming languages ​​can be used for calculation and modeling.

[0116] Furthermore, in step S220, the second functional relationship is as follows:

[0117] d=g(ω,y 浆 );

[0118] Where d represents the current roller spacing; ω represents the solid content of the target slurry; y 浆 The slurry density represents the target slurry.

[0119] In the above steps, the appropriate roller spacing can be determined based on the solid content of the target slurry, the coating surface density, and the slurry density, thereby establishing the functional relationship between the variables and further determining the spacing function relationship. To achieve this step, mathematical modeling and function fitting are required based on the specific coating equipment and material characteristics. Numerical calculation software (such as MATLAB) or programming languages ​​can be used for calculation and modeling.

[0120] Furthermore, in step S230, the functional relationship of the spacing function is as follows:

[0121] d=F(x 浆 ,y 浆 );

[0122] Where d represents the current roller spacing; x 浆 y represents the viscosity of the target slurry; 浆 The slurry density represents the target slurry.

[0123] In the above steps, the functional relationship d = F(x) was determined. 浆 ,y 浆 The appropriate roller spacing can be determined based on the viscosity and density of the target slurry, thereby achieving density coating control on the electrode surface. Determining the above functional relationship requires mathematical modeling and function fitting based on the specific coating equipment and material characteristics.

[0124] Example 4:

[0125] To illustrate more clearly, the electrode surface density coating control method provided in this invention is based on the methods in Examples 1-3 above, and is implemented and calculated as follows.

[0126] 1. Experimental Method:

[0127] S1. Test the solid content ω and viscosity x of the target slurry, with the following specific requirements:

[0128] (1) Sample tests and data collection are performed every 20 seconds;

[0129] (2) The test lasted a total of 3 hours;

[0130] (3) Record 540 sets of data. Based on the 540 sets of measured values ​​of solid content ω and viscosity x, construct a functional relationship:

[0131] ω=f(x 浆 );

[0132] S2. Determination of the spacing function relationship:

[0133] (1) The surface density of the slurry can be calculated based on the coating surface density and the solid content of the slurry. The formula is as follows:

[0134] (2) The surface density of the slurry can be calculated based on the slurry density and coating thickness, using the following formula:

[0135] ρ 浆面 =y 浆 ×d;

[0136] (3) Therefore, the coating thickness, i.e. the current roll gap d between the coating roller and the back roller, can be expressed by the slurry solid content ω and the coating surface density ρ. 涂布 and slurry density y 浆 The functional relationship is expressed as follows:

[0137] d=g(ω,y 浆 );

[0138] S3, according to ω=f(x) 浆 ) and d=g(ω,y 浆 The current roller spacing d between the coating roller and the back roller is related to the slurry viscosity x. 浆 , slurry density y 浆 The distance function relationship between them is d=F(x) 浆 ,y 浆 );

[0139] S4. Using real-time testing equipment (online viscosity meter and online density meter), monitor the current viscosity x of the slurry in the tank in real time. 浆 With the current slurry density y 浆 ;

[0140] S5. Based on the real-time measured current slurry viscosity x 浆 and the current slurry density y 浆 Adjust the distance d between the coating roller and the back roller online.

[0141] 2. Testing Method:

[0142] The areal density values ​​of the electrodes coated according to the method of the present invention were measured at 20 different locations.

[0143] The specific results are as follows:

[0144] refer to Figure 5 The results show that the area density of the electrode at 20 different locations was tested using the method of the present invention to obtain the electrode.

[0145] The preset surface density is 180 g / m³. 2 The actual measured coating surface density value deviates from the preset surface density value by no more than 1%.

[0146] Compared with the prior art, the innovation of this invention lies in the use of real-time measurement to monitor the viscosity and density of the slurry in the trough, and then calculate the coating thickness through a functional relationship. The uniformity of the slurry coating is ensured by adjusting the distance between the coating roller and the back roller in real time.

[0147] The results show that the method of the present invention can effectively ensure coating uniformity.

[0148] In addition, refer to Figure 6 This embodiment also provides an electrode surface density coating control device, including:

[0149] The acquisition module 10 is used to acquire test data for the target slurry;

[0150] Analysis module 20 is used to determine the spacing function relationship between the viscosity and density of the target slurry and the roller coating distance between the coating roller and the back roller based on the test data.

[0151] The acquisition module 10 is also used to acquire the current viscosity and current density of the target slurry in real time;

[0152] The calculation module 30 is used to calculate the current roller spacing corresponding to the current viscosity and the current slurry density according to the spacing function relationship, and control the coating machine to perform coating at the current roller spacing.

[0153] Furthermore, this embodiment also provides an electrode surface density coating control system, including a memory and a processor. The memory stores an electrode surface density coating control program, and the processor runs the electrode surface density coating control program to enable the electrode surface density coating control system to perform the electrode surface density coating control method as described above.

[0154] In addition, this embodiment also provides a computer-readable storage medium storing an electrode surface density coating control program, which, when executed by a processor, implements the electrode surface density coating control method as described above.

[0155] In summary, the control method provided by this invention can obtain the required spacing between the coating roller and the back roller based on the current viscosity and density of the target slurry during the current coating process, and adjust the coating thickness in real time using this spacing, thereby ensuring that the electrode surface density remains uniform and stable during the coating process. The method is simple, highly accurate, greatly reduces manufacturing costs, improves product quality, and provides convenience for the preparation of electrodes for lithium-ion batteries.

[0156] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0157] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention. The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for controlling the surface density coating of electrode sheets, characterized in that, include: Obtain test data for the target slurry: under preset duration and preset time interval conditions, continuously sample and test the viscosity data and solid content data of the target slurry in the test data; The viscosity data and solid content data measured at each time interval within the preset time period are used as a set of measurement values, and all sets of measurement values ​​within the preset time period are used as the test data. Based on the test data, a functional relationship between the solid content and viscosity of the target slurry is established as the first functional relationship; Establish a functional relationship between the solid content, slurry density, coating surface density and roller spacing of the target slurry, as a second functional relationship; Based on the first functional relationship and the second functional relationship, a functional relationship is established between the roller coating spacing and the viscosity and density of the target slurry, which is used as the spacing functional relationship; The current viscosity and density of the target slurry are obtained in real time. Based on the spacing function relationship, the current roller spacing corresponding to the current viscosity and the current slurry density is calculated, and the coating machine is controlled to perform coating at the current roller spacing.

2. The electrode surface density coating control method as described in claim 1, characterized in that, The preset duration is no less than 3 hours.

3. The electrode surface density coating control method as described in claim 1, characterized in that, The preset time interval is no more than 20 seconds.

4. The electrode surface density coating control method as described in claim 1, characterized in that, The number of groups of measured values ​​shall be no less than 540.

5. The electrode surface density coating control method as described in claim 1, characterized in that, The first functional relationship is as follows: ； in, Represents the solids content of the target slurry; This represents the viscosity of the target slurry.

6. The electrode surface density coating control method as described in claim 1, characterized in that, The functional relationship of the second function is obtained through the following method: According to the coating surface density of the target slurry and solid content This leads to the first formula for calculating the surface density of slurry: ; According to the slurry density The surface density of the slurry is calculated by combining the current roller spacing d with the calculated surface density. The second calculation formula: ; Based on the first calculation formula and the second calculation formula, the functional relationship of the second functional relationship can be obtained.

7. The electrode surface density coating control method as described in claim 6, characterized in that, The second functional relationship is as follows: ； Wherein, d represents the current roller spacing; Represents the solids content of the target slurry; The slurry density represents the target slurry.

8. The electrode surface density coating control method as described in claim 1, characterized in that, The functional relationship of the spacing function is as follows: ； Wherein, d represents the current roller spacing; The viscosity represents the target slurry; The slurry density represents the target slurry.

9. A device for controlling the surface density coating of electrode sheets, characterized in that, For performing the electrode surface density coating control method according to any one of claims 1-8, the electrode surface density coating control device comprises: The acquisition module is used to acquire test data for the target slurry; The analysis module is used to determine the relationship between the viscosity and density of the target slurry and the spacing function between the coating roller and the back roller, based on the test data. The acquisition module is also used to acquire the current viscosity and current density of the target slurry in real time; The calculation module is used to calculate the current roller spacing corresponding to the current viscosity and the current slurry density according to the spacing function relationship, and control the coating machine to perform coating at the current roller spacing.

10. A control system for electrode surface density coating, characterized in that, The system includes a memory and a processor, wherein the memory stores an electrode surface density coating control program, and the processor runs the electrode surface density coating control program to cause the electrode surface density coating control system to perform the electrode surface density coating control method as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an electrode surface density coating control program, which, when executed by a processor, implements the electrode surface density coating control method as described in any one of claims 1-8.

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