Energy storage battery pole piece coating thickness control method and system

Abstract

The application discloses a kind of energy storage battery pole piece coating thickness control method and system, it is related to electrode manufacturing technical field, including, obtain preset target coating parameter, establish target edge thickness control data, and generate material section edge mapping data;Collect the same material section wet film edge thickness data, dry film edge thickness data and edge surface continuity data, extract dry film edge low value data;Correlate wet film thickness state, dry film low value state and edge film layer intermittent state, generate edge low value credibility data;According to edge low value credibility data generate edge compensation permission data, the weight or amplitude limiting processing of material increase compensation amount is carried out, forms edge false compensation control instruction, and according to subsequent material section edge detection data update corresponding relationship, for solving dry film edge low value difficult to distinguish real coating thin and film layer intermittent caused by low value of thickness measurement, leading to edge thickness control easy false compensation problem.

Description

Technical Field

[0001] This invention relates to the field of electrode manufacturing technology, and in particular to a method for controlling the coating thickness of energy storage battery electrodes. Background Technology

[0002] The preparation of energy storage battery electrodes is part of the electrode manufacturing process in the production of lithium-ion battery cells, supercapacitor cells, and other batteries. It typically involves coating electrode slurry onto the surface of a current collector and then drying it to form a dry film. Current methods for controlling coating thickness often employ online thickness measurement, lateral zone detection, or coating port adjustment. These methods compare the wet or dry film thickness with target coating parameters and then adjust the feed rate, coating port output, or related control parameters. Existing solutions have also disclosed closed-loop control methods for electrode coating achieved through corresponding front and rear detection positions, thickness measurement in the same area, and output compensation.

[0003] During continuous coating, the electrode edge area is easily affected by factors such as slurry spreading, drying shrinkage, and edge thickness, resulting in discontinuous film conditions such as cracks, powdering, or localized peeling. On the one hand, conventional closed-loop thickness control usually uses low-value data at the dry film edge as the basis for insufficient coating, failing to adequately distinguish between actual thin coating and low thickness values ​​caused by film discontinuity. On the other hand, the data correlation between wet film edge thickness, low-value dry film, and edge surface continuity is insufficient, allowing material addition compensation to still be triggered according to the ordinary thinning logic, resulting in an insufficient connection between the processing result and subsequent compensation allowances and control adjustments. Summary of the Invention

[0004] In view of the aforementioned existing problems, the inventors have proposed the present invention.

[0005] Therefore, the present invention provides a method for controlling the coating thickness of energy storage battery electrodes to solve the problem that it is difficult to distinguish between the low value at the edge of the dry film and the actual thinness and the low value of the film layer due to discontinuous measurement, which leads to insufficient reliability of the basis for material compensation.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] This invention provides a method for controlling the coating thickness of energy storage battery electrodes, comprising:

[0008] Obtain preset target coating parameters, establish target edge thickness control data, and number the energy storage battery electrode strips by segment and divide the edge detection area to generate segment edge mapping data;

[0009] Based on the material segment edge mapping data, wet film edge thickness data, dry film edge thickness data and edge surface continuity data of the same material segment are collected. Low-value data of dry film edge are extracted to obtain edge detection data of the same material segment. Edge surface continuity data is used to reflect the discontinuous state of the edge film layer.

[0010] Based on the edge detection data of the same material section, the wet film thickness status, dry film low value status and edge film discontinuity status are correlated to generate edge low value reliability data. The edge low value reliability data is used to characterize the reliability of the dry film edge low value data as the basis for material addition compensation.

[0011] Based on the reliability data of low edge values, determine the proportion or upper limit of low edge values ​​of dry film participating in the material compensation, and generate edge compensation permission data;

[0012] Based on the edge compensation permission data, the material compensation amount is weighted or limited to form an edge error prevention compensation control command, and the edge thickness control parameters of the subsequent material section are adjusted.

[0013] Collect edge detection data of subsequent material sections after executing edge error prevention compensation control commands, update the correspondence between edge low value reliability data and edge compensation permission data, and obtain edge thickness control update data.

[0014] As a preferred embodiment of the method for controlling the coating thickness of the energy storage battery electrode sheet according to the present invention, wherein: the generation of material segment edge mapping data includes:

[0015] The material segment number is generated according to the running direction of the energy storage battery electrode strip;

[0016] Based on the target edge thickness control data, determine the edge detection area in each material segment;

[0017] Establish a correspondence between the edge detection area and the acquisition locations of wet film edge thickness data, dry film edge thickness data, and edge surface continuity data, and write them into the material segment edge mapping data.

[0018] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, the step of extracting low-value data at the edge of the dry film includes:

[0019] Based on the dry film edge thickness data and the target edge thickness control data, determine the thickness deviation position within the same material segment edge detection area that is lower than the target thickness represented by the target edge thickness control data;

[0020] The thickness deviations of continuously distributed locations are merged into low-value intervals;

[0021] Write the thickness value corresponding to the low value range into the low value data at the edge of the dry film according to the material segment number.

[0022] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, wherein: the discontinuous state of the edge film layer is determined by edge surface continuity data, including:

[0023] The discontinuous interval of the surface is determined based on the continuous variation relationship of the edge surface continuity data within the same material section;

[0024] The surface discontinuous intervals are matched with the low-value intervals in the low-value data of the dry film edge according to the material segment edge mapping data.

[0025] When the surface discontinuous interval and the low value interval at least partially overlap in the material segment edge mapping data, or when their positions match within the same material segment edge detection area, the surface discontinuous interval is marked as the edge film layer discontinuous state and written into the same material segment edge detection data.

[0026] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, the step of correlating the wet film thickness state, the dry film low value state, and the edge film discontinuity state based on edge detection data of the same material segment includes:

[0027] The wet film thickness state is determined based on the thickness difference relationship between the wet film edge thickness data and the target thickness represented by the target edge thickness control data.

[0028] The dry film low value state is determined based on the thickness difference relationship between the dry film edge low value data and the target thickness represented by the target edge thickness control data;

[0029] The degree of thickness inheritance is determined based on the same-direction deviation relationship and positional correspondence between the wet film thickness state and the dry film low value state relative to the target thickness within the same material section edge detection area.

[0030] The degree of low-value distortion is determined based on the overlapping position of the discontinuous state of the edge film layer and the low-value state of the dry film within the same material section edge detection area.

[0031] Edge low-value reliability data is generated based on the degree of thickness inheritance and the degree of low-value distortion.

[0032] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, wherein: the generation of edge low-value reliability data includes:

[0033] The confidence interval of low-value data at the edge of the dry film is determined based on the degree of thickness inheritance and the degree of low-value distortion.

[0034] When the thickness inheritance level is within the preset high inheritance range and the low value distortion level is within the preset low distortion range, the edge low value confidence data is set to the high confidence range.

[0035] When the thickness inheritance level is not within the preset high inheritance range, or the low value distortion level is not within the preset low distortion range, the edge low value confidence data is set to the low confidence interval.

[0036] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, the step of determining the proportion or upper limit of dry film edge low-value data participating in the material addition compensation based on edge low-value reliability data, and generating edge compensation permission data includes:

[0037] Based on the pre-defined segmented correspondence between the confidence interval and the basic participation ratio, the corresponding basic participation ratio is determined according to the confidence interval where the edge low-value confidence data is located.

[0038] The basic upper limit is determined based on the basic participation ratio;

[0039] The compensation correction amount is determined based on the degree of deviation of the low-value data at the dry film edge from the target thickness represented by the target edge thickness control data;

[0040] The compensation correction amount is constrained based on the credibility data of low edge values, and the basic participation ratio and basic limit upper limit are corrected using the constrained compensation correction amount.

[0041] The revised base participation ratio and base limit upper limit will be written into the edge compensation license data.

[0042] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, the step of weighting or limiting the material compensation amount according to the edge compensation permission data to form an edge anti-misoperation compensation control command includes:

[0043] The basic material addition compensation amount is determined based on the degree of deviation of the low value data at the dry film edge from the target thickness represented by the target edge thickness control data.

[0044] The basic material compensation amount is weighted according to the participation ratio in the edge compensation permission data to obtain the weighted material compensation amount.

[0045] Based on the upper limit of the edge compensation permit data, the weighted material compensation amount is converted into a control amount that does not exceed the upper limit of the edge compensation permit data;

[0046] Write the control quantity into the edge anti-misoperation compensation control instruction.

[0047] As a preferred embodiment of the energy storage battery electrode coating thickness control method of the present invention, wherein: the correspondence between updating the edge low-value reliability data and the edge compensation permission data is used to obtain edge thickness control update data, including:

[0048] The low-value data and surface continuity data of the dry film edge in the subsequent material section edge detection data are compared with the low-value data and surface continuity data of the dry film edge before the execution of the edge error prevention compensation control command to determine the low-value change results and surface continuity change results.

[0049] The permissible update amount is determined based on the results of changes in low values ​​and changes in surface continuity;

[0050] Update the participation ratio or upper limit in the edge compensation license data according to the license update volume;

[0051] Write the updated participation ratio or limit upper limit into the edge compensation license data, and write the correspondence between the edge low value credibility data and the updated edge compensation license data into the edge thickness control update data.

[0052] As a control system for the coating thickness of energy storage battery electrodes according to the present invention, it includes:

[0053] The mapping module acquires preset target coating parameters, establishes target edge thickness control data, and divides the energy storage battery electrode strip into segments and edge detection areas to generate segment edge mapping data.

[0054] The detection module, based on the material segment edge mapping data, collects wet film edge thickness data, dry film edge thickness data, and edge surface continuity data of the same material segment, extracts low-value data of dry film edge, and obtains edge detection data of the same material segment. The edge surface continuity data is used to reflect the discontinuous state of the edge film layer.

[0055] The reliability assessment module correlates the wet film thickness status, dry film low value status, and edge film layer discontinuity status based on the edge detection data of the same material segment to generate edge low value reliability data. The edge low value reliability data is used to characterize the reliability of the dry film edge low value data as the basis for material addition compensation.

[0056] The license generation module determines the proportion or upper limit of dry film edge low value data participating in additive compensation based on edge low value reliability data, and generates edge compensation license data.

[0057] The compensation control module, based on the edge compensation permission data, weights or limits the amount of material compensation, generates an edge error prevention compensation control command, and adjusts the edge thickness control parameters of the subsequent material section.

[0058] The closed-loop update module collects edge detection data of subsequent material sections after the execution of the edge error prevention compensation control command, updates the correspondence between low-value edge reliability data and edge compensation permission data, and obtains edge thickness control update data.

[0059] The beneficial effects of this invention are as follows: By correlating the wet film edge thickness data, dry film edge thickness data, and edge surface continuity data of the same material segment, before the low value of the dry film edge is involved in the material addition compensation, it is first determined whether the low value of the dry film edge corresponds to the actual thinness of the wet film stage and whether it is affected by the discontinuous state of the edge film layer. Then, edge compensation permission data is generated based on the reliability data of the low value of the edge, and the material addition compensation amount is weighted or limited. This reduces the situation where the low thickness value caused by cracks, powdering, or local peeling is mistakenly used as insufficient coating amount for material addition compensation, thereby improving the stability of the edge thickness control process and the reliability of the compensation basis. Attached Figure Description

[0060] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 This is a flowchart of the method for controlling the coating thickness of the energy storage battery electrode in Example 1;

[0062] Figure 2 This is a flowchart illustrating the generation of edge detection data for the same material segment in the energy storage battery electrode coating thickness control method of Example 1.

[0063] Figure 3 This is a flowchart illustrating the generation process of edge low-value reliability data and edge compensation permission data for the energy storage battery electrode coating thickness control method in Example 1.

[0064] Figure 4 This is a flowchart of the edge anti-misoperation compensation control command execution and feedback update process for the energy storage battery electrode coating thickness control method in Example 1. Detailed Implementation

[0065] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0066] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0067] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0068] Reference Figures 1-4 This is the first embodiment of the present invention, which provides a method for controlling the coating thickness of energy storage battery electrodes, including the following steps:

[0069] The following provides a further description of a method for controlling the coating thickness of an energy storage battery electrode according to the present invention. This embodiment illustrates a specific implementation of the method in a continuous coating process; the relevant thresholds, ranges, and coefficients can be set according to actual process conditions.

[0070] During continuous coating, the low value measured at the edge of the dry film does not only indicate insufficient coating at the front end. Some low values ​​may be due to the actual thinness that already existed in the wet film stage; others may be due to cracking, powdering, or local peeling of the edge film layer after drying, which will affect the thickness measurement result due to the discontinuous state of the edge film layer.

[0071] Before production begins, preset target coating parameters are acquired, and target edge thickness control data is generated from these parameters. The preset target coating parameters include wet film target thickness, dry film target thickness, edge detection area width, wet film thinning threshold, dry film low value threshold, edge surface continuity threshold, participation ratio boundary, limit upper limit boundary, and compensation coefficient. The target edge thickness control data includes wet film target thickness, dry film target thickness, edge detection area location, allowable thickness deviation range, participation ratio boundary, and limit upper limit boundary. The dry film detection location is used to obtain the thickness status of the edge location after drying, and the edge surface continuity detection location is used to determine whether there are cracks, powdering, local peeling, or other discontinuous conditions in the edge film layer.

[0072] When the energy storage battery electrode strip is running continuously, the strip is segmented along the running direction, and an edge detection area is defined within each segment. The edge detection area is located near the left or right edge of the strip where the coating film is applied; when both left and right edges need to be controlled, corresponding edge detection areas are formed respectively. The correspondence between the segment number, edge identification, edge detection area, wet film edge thickness data acquisition location, dry film edge thickness data acquisition location, and edge surface continuity data acquisition location is written into the segment edge mapping data.

[0073] Since wet film inspection, dry film inspection, and edge surface continuity inspection are usually not in the same physical location, there is a time difference in the arrival time of the same material segment at different inspection positions. A time mapping relationship between the arrival time of the same material segment at each inspection position can be established based on the coating start time, the current linear velocity of the material segment, and the distance of each inspection position from the coating reference point. Let the coating start time be... The current linear speed of the material section is The distances from the wet film detection position, dry film detection position, and edge surface continuity detection position to the coating reference point are respectively: , and The times when the same material segment reaches the wet film detection position, dry film detection position, and edge surface continuity detection position are respectively... , and The time mapping relationship is then established according to the following formula:

[0074]

[0075]

[0076]

[0077] This time mapping relationship is used to classify data collected from different detection locations into the same material segment number, ensuring that subsequent comparisons are made of the wet film thickness status, dry film low value status, and edge film discontinuity status of the same material segment.

[0078] Once the edge mapping data of the material segment is established, collect the wet film edge thickness data, dry film edge thickness data, and edge surface continuity data of the same material segment.

[0079] For the edge detection area of ​​the same material segment, the sampling positions within the edge detection area can be recorded as follows: The sampling location can be a spatial location or a sampling point number formed according to the sampling order. Subsequent discussions of location correspondence, interval merging, and interval overlap are all based on sampling locations within the same material segment edge detection area. conduct.

[0080] After the dry film edge thickness data is collected, low-value data of the dry film edge are extracted from the dry film edge thickness data. Indicates position The thickness of the dry film edge at that location is equal to the target dry film thickness. Indicates position Dry film target thickness, dry film edge thickness data and dry film target thickness Using the same thickness unit, when the target dry film thickness Dry film edge thickness data The difference between them is greater than the preset low value threshold for dry film. At that time, the corresponding position is determined as the thickness deviation position; continuously distributed thickness deviation positions are merged into the dry film low value interval in the dry film edge low value data. Let the number of dry film low value intervals formed within the same material segment be . , No. The low value range of dry film is denoted as the low value range of dry film. The low value range of dry film is then determined according to the following formula. :

[0081]

[0082] Only dry film edge thickness data Relative to the target thickness of the dry film The deviation exceeds the preset dry film low value threshold. Only when the value reaches a certain level will it enter the low value range of dry film. .

[0083] If multiple separate low-value ranges of dry film exist within the same material section This results in multiple low-value ranges for dry film. Low value range for each dry film Corresponding material segment number, edge identification, interval identifier, location range, and dry film edge thickness value. as well as The difference is written into the low-value data at the edge of the dry film.

[0084] When the equipment uses zone control, the low value range of each dry film Each corresponds to its respective edge control partition;

[0085] When the equipment uses a single edge control channel, then the low value range of each dry film is further analyzed. The corresponding control quantities are summarized.

[0086] Within the same material section, the area with a thinner wet film is also determined based on the wet film edge thickness data. (The wet film edge thickness data is used as the basis for this determination.) Indicates position The thickness of the wet film edge at that location is equal to the target thickness of the wet film. Indicates position Target thickness of wet film at location, wet film edge thickness data and target thickness of wet film Use the same thickness unit, and use the same or a convertible thickness unit as the dry film thickness data. When the target wet film thickness... With wet film edge thickness data The difference between them is greater than the preset threshold for thin wet film. At that time, the corresponding location is determined as the location of the thin wet film; continuously distributed locations of thin wet film are merged into a thin wet film interval. And determine the thinner wet film area according to the following formula. :

[0087]

[0088] Wet film edge thickness data Relative to target thickness of wet film The deviation exceeds the preset wet film thinning threshold. The location was classified as a thin wet film area. .

[0089] Simultaneously, the discontinuous intervals of the surface are determined based on the edge surface continuity data. (The edge surface continuity data is used as the basis for this determination.) Indicates position Edge surface continuity evaluation value, edge surface continuity data This can be a normalized continuity evaluation value; a larger value indicates a more continuous film layer, while a smaller value indicates a higher risk of film discontinuity. (The last sentence appears to be incomplete and possibly refers to edge surface continuity data.) Below the preset continuity threshold When the time is right, the corresponding location is determined as the surface discontinuity location; continuously distributed surface discontinuity locations are merged into surface discontinuity intervals. The surface discontinuity interval is determined according to the following formula. :

[0090]

[0091] When the edge surface is continuous data Below the preset continuity threshold The locations identified were considered to have risks of cracking, powdering, localized peeling, or other film discontinuities, and were categorized as surface discontinuity zones. .

[0092] Surface discontinuous interval With each dry film low value range Position correspondence is performed based on the edge mapping data of the material segment. When the surface is discontinuous... Low value range of dry film When there is at least partial overlap, or when the positions match within the same material segment edge detection area, the corresponding position is marked as a discontinuous edge film layer state and written into the same material segment edge detection data. At this time, the same material segment edge detection data includes at least the material segment number, edge side, wet film edge thickness data, dry film edge thickness data, edge surface continuity data, and areas with thinner wet film. Low value range of dry film Surface discontinuous interval And the discontinuous state of the edge membrane layer.

[0093] Thin wet film area Low value range of dry film and surface discontinuous interval The data are not used independently, but rather correlated within the same material section and the same edge detection area. It's necessary to examine the location where the low value appears in the dry film, whether there is also thinning in the wet film stage, and whether cracks, powder shedding, or localized peeling are present at that location. This is necessary to determine whether the low value at the dry film edge is closer to the actual thinning or closer to the low thickness measurement caused by discontinuous film layer at the edge.

[0094] For each dry film low value range According to the area where the wet film is relatively thin Low value range of dry film The degree of thickness inheritance is determined by the positional overlap relationship.

[0095] Thickness inheritance Indicates the first Low value range of dry film Corresponding thickness inheritance degree, overlap length Indicates the area where the wet film is relatively thin. Low value range of dry film overlap length, interval length Indicates the low value range of dry film Length;

[0096] In discrete implementations, the interval length can be calculated by multiplying the number of samples by the sampling interval.

[0097] Thickness inheritance Determined according to the following formula:

[0098]

[0099] Thin wet film area Low value range of dry film The higher the overlap ratio, the greater the thickness inheritance. The higher the value, the more likely the low dry film value is to be inherited from the thinner edge of the wet film stage. If the current material segment does not have a low dry film value range... If the material segment does not trigger the material addition compensation judgment based on low-value data at the edge of the dry film; if the wet film is in a thinner range... If it does not exist, then the overlap length is... It is 0.

[0100] For each dry film low value range Based on the dry film edge thickness value within the interval Calculate the degree of deviation from the dry film low value. (Based on the degree of deviation from the dry film low value...) Indicates the first Low value range of dry film The corresponding deviation of the low value of the dry film is calculated using the average sign. Indicates the low value range for dry film The values ​​from all sampling locations within the sample are averaged. The degree of deviation of the low values ​​in the dry film. Determined according to the following formula:

[0101]

[0102] For the low value range of dry film Each sampling location within Taking the average, the low value range of the dry film is obtained. Dry film low value deviation Due to the low value range of dry film The definition satisfies >n, therefore the degree of deviation of the low value of dry film Positive values; degree of deviation from low dry film values The larger the value, the lower the range of the dry film. Relative to the target thickness of the dry film The more obvious the deviation, the better.

[0103] For each dry film low value range According to the surface discontinuous interval Low value range of dry film The degree of low-value distortion is determined by the positional overlap relationship.

[0104] With low distortion Indicates the first Low value range of dry film The corresponding low-value distortion level, in terms of overlap length Indicates the discontinuous interval of the surface Low value range of dry film The overlap length.

[0105] Low value distortion Determined according to the following formula:

[0106]

[0107] Surface discontinuous interval Low value range of dry film The higher the overlap ratio, the greater the distortion of low values. The higher the value, the more likely the low dry film value is to be affected by the discontinuous state of the edge film layer, such as cracks, powdering, and local peeling. If the surface discontinuous area... If it does not exist, then the overlap length is... It is 0.

[0108] Based on the degree of thickness inheritance and low value distortion Generate margin low-value credibility data.

[0109] With low-value confidence data at the edge Indicates the first Low value range of dry film The corresponding edge low value credibility data.

[0110] Marginal low value credibility data The reliability is determined according to the calculation rule that the higher the degree of thickness inheritance and the lower the degree of low-value distortion, the higher the reliability:

[0111]

[0112] Thickness inheritance Reliability data for low-value margins It has a positive effect, reducing the degree of distortion at low values. Reliability data for low-value margins It has an inhibitory effect.

[0113] Thickness inheritance The higher the value and the lower the distortion. The lower the value, the more reliable the marginal low-value data. The higher;

[0114] Thickness inheritance The lower or lower the value, the less distortion. The higher the value, the more reliable the low-marginal value data. The lower.

[0115] The confidence interval is based on the degree of thickness inheritance. and low value distortion The determination is based on whether each value falls within a preset range, rather than solely on the reliability data of low-margin values. Determined separately.

[0116] When the thickness inheritance Located within the preset high inheritance range and with low distortion level When the value is within the preset low distortion range, the low value range of the dry film is... Corresponding edge low value confidence data Set as a high confidence interval;

[0117] When the thickness inheritance Below the preset high inheritance range, or low value distortion level When the value is higher than the preset low distortion range, the low value range of the dry film will be adjusted. Corresponding edge low value confidence data Set to a low confidence interval.

[0118] For example, the degree of thickness inheritance ≥0.70 and low value distortion When ≤0.30, it corresponds to the high confidence interval; thickness inheritance degree Distortion level <0.70 or low A value greater than 0.30 corresponds to a low confidence interval.

[0119] After determining the confidence interval, edge compensation permission data is generated first, instead of directly outputting feed control.

[0120] For each dry film low value range The basic participation ratio is determined according to the pre-defined segmented correspondence between the confidence interval and the basic participation ratio. ;

[0121] Then based on the basic participation ratio The range in which it falls determines the upper limit of the basic limit. .

[0122] The basic participation ratio range corresponding to the high confidence interval is higher than that corresponding to the low confidence interval. The higher the value, the higher the corresponding base amplitude limit. And it's also higher.

[0123] The compensation correction amount is based on the degree of deviation of the dry film low value. The preset deviation range has been determined. A compensation correction amount is then applied. Indicates the first Low value range of dry film Corresponding compensation adjustment amount, compensation adjustment amount This is a normalization correction value, and its value is within a preset correction range, such as [0,1].

[0124] When the dry film low value deviates to a certain extent When it is in a lower deviation range, it corresponds to a smaller compensation correction amount. ;

[0125] When the dry film low value deviates to a certain extent When the deviation is higher, a larger compensation correction amount is required. .

[0126] Compensation correction after constraints This indicates the reliability of low-value data at the edge. The compensation adjustment amount after constraint, the compensation adjustment amount after constraint Determined according to the following formula:

[0127]

[0128] Marginal low value credibility data The lower the value, the greater the compensation correction amount. The stronger the suppression, the greater the compensation correction amount after constraint. The smaller;

[0129] Even if the dry film low value deviates to a certain extent Larger values ​​only require reliable edge low-value data. The level is relatively low, and it will not directly amplify subsequent material supplementation compensation.

[0130] Using the compensation correction amount after constraints Adjust the basic participation ratio and basic limit upper limit , obtain participation ratio and upper limit The upper limit is preset based on the participation ratio. The upper limit of the participation ratio is a preset upper limit, with the upper limit of the amplitude being the preset upper limit. Indicates the preset upper boundary of the amplitude limit;

[0131] Basic participation rate Participation rate , participation ratio preset upper limit Compensation and correction amount Compensation correction amount after constraints Degree of thickness inheritance Low value distortion degree and marginal low-value credibility data All are dimensionless proportional quantities, with a basic limit and upper limit. , limiting upper limit and the upper limit of the amplitude limit preset. Use the same control output unit. Participation ratio and upper limit Determined according to the following formula:

[0132]

[0133]

[0134] Compensation correction amount after constraint The larger the proportion, the higher the participation rate. and upper limit The closer it gets to the corresponding participation ratio preset upper boundary and the upper limit of the amplitude limit preset. ; Compensation correction amount after constraint The smaller the number, the higher the participation rate. and upper limit The closer to the basic participation rate and basic limit upper limit Revised participation ratio and upper limit Write edge compensation permission data. This edge compensation permission data includes at least the segment number, edge side, interval identifier, reliable interval, and edge low value reliability data. Participation rate and upper limit .

[0135] Edge compensation permission data is used to limit the participation of low-value data at the dry film edge in additive compensation. For high-confidence dry film low-value ranges... participation rate and upper limit Allow the basic feed compensation amount to enter the control command to a high degree; for low-confidence dry film low-value range Even with a large amount of basic material supplementation, it is still achieved through a low participation ratio. Or lower limit Limit the final control quantity.

[0136] For each dry film low value range Based on the degree of deviation of the low value of the dry film Determine the basic material replenishment compensation amount. Use the basic material replenishment compensation amount... Indicates the first Low value range of dry film The corresponding basic material compensation amount is based on the preset compensation coefficient. This represents the compensation coefficient used to convert thickness deviation into control output. Basic material addition compensation amount. Determined according to the following formula:

[0137]

[0138] Dry film low value deviation The larger the base material compensation amount without considering reliability constraints, The larger.

[0139] Basic material compensation With the basic limit upper limit , limiting upper limit Limiting upper limit preset upper boundary The same control output unit is used for subsequent control quantities.

[0140] The edge thickness control parameters include at least one of the following: edge area feeding correction amount, edge coating port discharge correction amount, and edge coating gap correction amount.

[0141] For each dry film low value range Based on the participation ratio in the edge compensation license data Compensation for basic material addition The weighted average is then calculated to obtain the weighted material compensation amount.

[0142] Then based on the upper limit of the amplitude The weighted average material compensation amount is limited to obtain the low value range of the dry film. The corresponding control quantity.

[0143] To control the amount Indicates the first Low value range of dry film The corresponding control quantity, control quantity Determined according to the following formula:

[0144]

[0145] The control quantity that ultimately enters the edge error prevention compensation control command Both the participation rate Constraints, including the upper limit of amplitude. Constraints are imposed to prevent low-value edges of low-confidence dry films from directly triggering excessive feed compensation.

[0146] When the equipment uses zone control, each control variable Each corresponds to a specific edge control partition;

[0147] When the device uses a single edge control channel, it can target the low-value range of each dry film. Corresponding control quantity Summarize the results.

[0148] Based on the aggregated edge control values This represents the edge control quantity after summing the values ​​for this material segment. In one implementation, each control quantity can be taken. The maximum value in the range is used as the summed edge control value for that material segment. :

[0149]

[0150] Under a single edge control channel, priority is given to controlling the amount within the current material segment. Maximum dry film low value range Determine the aggregated edge control values .

[0151] The control quantity is written into the edge error prevention compensation control instruction and used to adjust the edge thickness control parameters of the subsequent material section.

[0152] Edge error prevention compensation control instructions should include at least the material segment number, edge side identification, interval identifier, and participation ratio. , limiting upper limit Basic material compensation amount Control quantity ;

[0153] For a single edge control channel, the sum of edge control values ​​for that material segment can also be included. .

[0154] To illustrate the control process described above, the following set of example data is provided. For material segment L001, the thickness inheritance degree corresponding to a certain low value range of dry film. The value is 0.83, indicating a low level of distortion. If it is 0.08, then:

[0155]

[0156] This interval meets the high-confidence interval criteria. If the participation ratio of this interval... It is 0.85, the upper limit of the limit. The base material compensation is 1.50. If the value is 2.00, then:

[0157]

[0158] At this point, the low value at the edge of the dry film has a strong positional correspondence with the thinness of the wet film, and it overlaps less with the discontinuous area on the surface. Therefore, it is allowed to participate in the material compensation to a high extent, but the final control amount is still constrained by the upper limit of the amplitude.

[0159] For material segment L002, the thickness inheritance degree corresponding to a certain low value range of dry film. The value is 0.18, indicating a low level of distortion. If it is 0.82, then:

[0160]

[0161] This interval meets the low-confidence interval condition. If the participation ratio of this interval... The maximum value is 0.20. The base material compensation amount is 0.30. If the value is 2.00, then:

[0162]

[0163] At this point, although there is a low value at the edge of the dry film, this low value highly overlaps with the discontinuous area on the surface, and the final control amount is strongly limited.

[0164] After the edge error prevention compensation control command is executed, edge detection data for subsequent material sections continues to be collected. The edge detection data for subsequent material sections also includes wet film edge thickness data, dry film edge thickness data, dry film edge low value data, edge surface continuity data, and edge film layer discontinuity status.

[0165] The low-value data and surface continuity data of the dry film edge at the corresponding edge position in the subsequent material section are compared with the corresponding data before the edge error prevention compensation control command is executed to determine the low-value change result and the surface continuity change result.

[0166] Based on the degree of deviation of the low value of the dry film before execution This indicates the degree of dry film low value deviation before executing the edge error prevention compensation control command, and the degree of dry film low value deviation after execution. This indicates the degree of deviation of the dry film low value in the corresponding interval of the subsequent material section after execution.

[0167] If the dry film low value deviates after execution Less than the deviation of the low value of the dry film before execution This indicates that the deviation of the low value at the edge of the dry film has decreased;

[0168] If the dry film low value deviates after execution Greater than or equal to the degree of deviation of the low value of the dry film before execution This indicates that the deviation of the low value at the edge of the dry film has not been improved.

[0169] The surface discontinuity percentage can also be determined based on edge surface continuity data to determine the surface discontinuity percentage before execution. This indicates the percentage of surface discontinuities before execution, and the percentage of surface discontinuities after execution. This indicates the percentage of surface discontinuity after execution.

[0170] If the surface is discontinuous after execution Less than or equal to the percentage of surface discontinuity before execution This indicates that surface continuity is maintained or improved; if the percentage of surface discontinuity is high after execution... Greater than the percentage of surface discontinuity before execution This indicates a deterioration in surface continuity.

[0171] The permitted update amount is determined based on the changes in low-value values ​​and surface continuity. The permitted update amount is expressed as an increase or decrease in the participation ratio and the upper limit of the limit, or a combination of both. If the deviation of low-value values ​​at several membrane edges decreases while surface continuity is maintained or improved, the current participation ratio and upper limit of the limit are maintained, or the participation ratio is appropriately increased within a preset range. If the deviation of low-value values ​​at several membrane edges does not decrease, the participation ratio is reduced or the upper limit of the limit is tightened. If surface continuity deteriorates, the participation ratio is not increased, and the upper limit of the limit is tightened. After the updated participation ratio or upper limit of the limit is written into the edge compensation permitted data, the material segment number, edge side, interval identifier, and edge low-value reliability data are included. Corresponding confidence interval, participation ratio before and after update, upper limit of amplitude before and after update, and degree of deviation of dry film low value before execution. Degree of deviation of dry film low value after execution , percentage of surface discontinuity before execution , percentage of intermittent surface activity after execution And update time is written to edge thickness control update data.

[0172] In summary, this invention establishes a continuous processing chain from edge detection data of the same material segment, edge low-value reliability data, edge compensation permission data, to edge error prevention compensation control commands, and updates the correspondence between edge low-value reliability data and edge compensation permission data using subsequent material segment edge detection data. This process ensures that before dry film edge low-value data participates in material addition compensation, it undergoes a correlation judgment between wet film thickness status, dry film low-value status, and edge film layer discontinuity status, thereby reducing the situation where low thickness values ​​caused by edge film layer discontinuity are directly used as the basis for material addition compensation.

[0173] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the coating thickness of energy storage battery electrodes, characterized in that, include: Obtain preset target coating parameters, establish target edge thickness control data, and number the energy storage battery electrode strips by segment and divide the edge detection area to generate segment edge mapping data; Based on the material segment edge mapping data, wet film edge thickness data, dry film edge thickness data and edge surface continuity data of the same material segment are collected. Low-value data of dry film edge are extracted to obtain edge detection data of the same material segment. Edge surface continuity data is used to reflect the discontinuous state of the edge film layer. Based on the edge detection data of the same material section, the wet film thickness status, dry film low value status and edge film discontinuity status are correlated to generate edge low value reliability data. The edge low value reliability data is used to characterize the reliability of the dry film edge low value data as the basis for material addition compensation. Based on the reliability data of low edge values, determine the proportion or upper limit of low edge values ​​of dry film participating in the material compensation, and generate edge compensation permission data; Based on the edge compensation permission data, the material compensation amount is weighted or limited to form an edge error prevention compensation control command, and the edge thickness control parameters of the subsequent material section are adjusted. Collect edge detection data of subsequent material sections after executing edge error prevention compensation control commands, update the correspondence between edge low value reliability data and edge compensation permission data, and obtain edge thickness control update data.

2. The method for controlling the coating thickness of energy storage battery electrodes according to claim 1, characterized in that, The generated material segment edge mapping data includes: The material segment number is generated according to the running direction of the energy storage battery electrode strip; Based on the target edge thickness control data, determine the edge detection area in each material segment; Establish a correspondence between the edge detection area and the acquisition locations of wet film edge thickness data, dry film edge thickness data, and edge surface continuity data, and write them into the material segment edge mapping data.

3. The method for controlling the coating thickness of energy storage battery electrodes according to claim 1, characterized in that, The extraction of low-value data from the edge of the dry film includes: Based on the dry film edge thickness data and the target edge thickness control data, determine the thickness deviation position within the same material segment edge detection area that is lower than the target thickness represented by the target edge thickness control data; The thickness deviations of continuously distributed locations are merged into low-value intervals; Write the thickness value corresponding to the low value range into the low value data at the edge of the dry film according to the material segment number.

4. The method for controlling the coating thickness of energy storage battery electrodes according to claim 3, characterized in that, The discontinuous state of the edge film layer is determined by edge surface continuity data, including: The discontinuous interval of the surface is determined based on the continuous variation relationship of the edge surface continuity data within the same material section; The surface discontinuous intervals are matched with the low-value intervals in the low-value data of the dry film edge according to the material segment edge mapping data. When the surface discontinuous interval and the low value interval at least partially overlap in the material segment edge mapping data, or when their positions match within the same material segment edge detection area, the surface discontinuous interval is marked as the edge film layer discontinuous state and written into the same material segment edge detection data.

5. The method for controlling the coating thickness of energy storage battery electrodes according to claim 1, characterized in that, The process of correlating the wet film thickness status, dry film low value status, and edge film discontinuity status based on edge detection data of the same material segment includes: The wet film thickness state is determined based on the thickness difference relationship between the wet film edge thickness data and the target thickness represented by the target edge thickness control data. The dry film low value state is determined based on the thickness difference relationship between the dry film edge low value data and the target thickness represented by the target edge thickness control data; The degree of thickness inheritance is determined based on the same-direction deviation relationship and positional correspondence between the wet film thickness state and the dry film low value state relative to the target thickness within the same material section edge detection area. The degree of low-value distortion is determined based on the overlapping position of the discontinuous state of the edge film layer and the low-value state of the dry film within the same material section edge detection area. Edge low-value reliability data is generated based on the degree of thickness inheritance and the degree of low-value distortion.

6. The method for controlling the coating thickness of an energy storage battery electrode according to claim 5, characterized in that, The generated edge low-value credibility data includes: The confidence interval of low-value data at the edge of the dry film is determined based on the degree of thickness inheritance and the degree of low-value distortion. When the thickness inheritance level is within the preset high inheritance range and the low value distortion level is within the preset low distortion range, the edge low value confidence data is set to the high confidence range. When the thickness inheritance level is not within the preset high inheritance range, or the low value distortion level is not within the preset low distortion range, the edge low value confidence data is set to the low confidence interval.

7. The method for controlling the coating thickness of an energy storage battery electrode according to claim 6, characterized in that, The step of determining the proportion or upper limit of dry film edge low-value data participating in additive compensation based on edge low-value reliability data, and generating edge compensation permission data, includes: Based on the pre-defined segmented correspondence between the confidence interval and the basic participation ratio, the corresponding basic participation ratio is determined according to the confidence interval where the edge low-value confidence data is located. The basic upper limit is determined based on the basic participation ratio; The compensation correction amount is determined based on the degree of deviation of the low-value data at the dry film edge from the target thickness represented by the target edge thickness control data; The compensation correction amount is constrained based on the credibility data of low edge values, and the basic participation ratio and basic limit upper limit are corrected using the constrained compensation correction amount. The revised base participation ratio and base limit upper limit will be written into the edge compensation license data.

8. The method for controlling the coating thickness of an energy storage battery electrode according to claim 7, characterized in that, The step of weighting or limiting the material compensation amount based on edge compensation permission data to form an edge error prevention compensation control command includes: The basic material addition compensation amount is determined based on the degree of deviation of the low value data at the dry film edge from the target thickness represented by the target edge thickness control data. The basic material compensation amount is weighted according to the participation ratio in the edge compensation permission data to obtain the weighted material compensation amount. Based on the upper limit of the edge compensation permit data, the weighted material compensation amount is converted into a control amount that does not exceed the upper limit of the edge compensation permit data; Write the control quantity into the edge anti-misoperation compensation control instruction.

9. The method for controlling the coating thickness of an energy storage battery electrode according to claim 8, characterized in that, The correspondence between the updated edge low-value reliability data and the edge compensation permission data is used to obtain edge thickness control update data, including: The low-value data and surface continuity data of the dry film edge in the subsequent material section edge detection data are compared with the low-value data and surface continuity data of the dry film edge before the execution of the edge error prevention compensation control command to determine the low-value change results and surface continuity change results. The permissible update amount is determined based on the results of changes in low values ​​and changes in surface continuity; Update the participation ratio or upper limit in the edge compensation license data according to the license update volume; Write the updated participation ratio or limit upper limit into the edge compensation license data, and write the correspondence between the edge low value credibility data and the updated edge compensation license data into the edge thickness control update data.

10. A coating thickness control system for energy storage battery electrodes, used to execute the coating thickness control method for energy storage battery electrodes according to any one of claims 1-9, characterized in that, include: The mapping module acquires preset target coating parameters, establishes target edge thickness control data, and divides the energy storage battery electrode strip into segments and edge detection areas to generate segment edge mapping data. The detection module, based on the material segment edge mapping data, collects wet film edge thickness data, dry film edge thickness data, and edge surface continuity data of the same material segment, extracts low-value data of dry film edge, and obtains edge detection data of the same material segment. The edge surface continuity data is used to reflect the discontinuous state of the edge film layer. The reliability assessment module correlates the wet film thickness status, dry film low value status, and edge film layer discontinuity status based on the edge detection data of the same material segment to generate edge low value reliability data. The edge low value reliability data is used to characterize the reliability of the dry film edge low value data as the basis for material addition compensation. The license generation module determines the proportion or upper limit of dry film edge low value data participating in additive compensation based on edge low value reliability data, and generates edge compensation license data. The compensation control module, based on the edge compensation permission data, weights or limits the amount of material compensation, generates an edge error prevention compensation control command, and adjusts the edge thickness control parameters of the subsequent material section. The closed-loop update module collects edge detection data of subsequent material sections after the execution of the edge error prevention compensation control command, updates the correspondence between the low-value reliability data of the edge and the edge compensation permission data, and obtains the edge thickness control update data.

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