A kind of pole piece coating closed loop control method

Abstract

The application provides a kind of pole piece coating closed loop control method, by closed loop control process, whole area density is adjusted, width size is adjusted and single point area density is adjusted in sequence respectively, the adjustment of whole area density is first adjusted longitudinal area density by adjusting pump speed according to the detection result of thickness gauge, then adjust T block height and / or the distance of die two ends to pole piece to adjust transverse area density, then adjust the distance of die left and right two ends to pole piece and / or adjust pump speed to adjust width size according to the detection result of visual detector, finally, adjust single point area density by adjusting each adjusting T block according to the detection result of thickness gauge, each link is closed loop control, can realize full-automatic accurate adjustment, from whole area density to width to single point area density, can guarantee higher coating quality, while greatly reducing labor cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spraying, pouring or flowing liquid or other fluid onto the surface of a workpiece, and in particular to a method for closed-loop control of electrode plate coating. BACKGROUND

[0002] With the rapid development of the new energy industry, the production of lithium batteries is increasing, and the safety and capacity of lithium batteries are the focus of users, which is closely related to the quality control of each process step in the manufacturing process of the battery. At present, in the coating process of the battery, the surface density of the coating on the electrode plate is often detected by a thickness gauge, and the width of the coating on the electrode plate is detected by a CCD camera. When the surface density or width is not qualified, an alarm is given, and then the supply pump speed, the distance between the two ends of the die and the electrode plate, and the die lip gap are adjusted manually. However, this results in high labor costs. SUMMARY

[0003] The purpose of the present application is to provide a method for closed-loop control of electrode plate coating to solve the problem of high labor costs caused by the existing manual control method.

[0004] The method for closed-loop control of electrode plate coating of the present application comprises a closed-loop control process.

[0005] The closed-loop control process comprises sequentially adjusting the overall surface density, the width size, and the single-point surface density.

[0006] The overall surface density adjustment comprises judging whether the longitudinal surface density of the coating meets the average surface density requirement according to the detection result of the thickness gauge. If not, and the deviation is within the set tolerance range, the pump speed of the die feed pump is adjusted until the longitudinal surface density meets the requirement, and then the pump speed is kept unchanged. If not, and the deviation exceeds the set tolerance range, an alarm is given. Then, it is judged whether the consistency of the transverse surface density of the coating is qualified. If not, and within the set tolerance range, the distance from the two ends of the die to the electrode plate and / or the height of the T block is adjusted until the consistency of the transverse surface density is qualified. If not, and the deviation exceeds the set tolerance range, an alarm is given.

[0007] The width size adjustment comprises judging whether the width size of the coating is qualified according to the visual detector. If not, the distance from the left and right ends of the die to the electrode plate and / or the pump speed is adjusted until the width size of the coating is qualified.

[0008] The single-point surface density adjustment comprises judging whether the surface density of the coating corresponding to each adjustment T block is equal to the middle value of the average surface density range according to the detection result of the thickness gauge, and adjusting the height of each adjustment T block until the surface density is equal to the middle value of the average surface density range.

[0009] This invention provides a novel closed-loop control method for electrode coating, representing a pioneering invention. The closed-loop control method of this invention adjusts the overall surface density, width dimension, and single-point surface density sequentially through a closed-loop control process. The overall surface density adjustment, based on the thickness gauge readings, first adjusts the longitudinal surface density by adjusting the pump speed, maintaining closed-loop control until the adjustment is satisfactory. Then, the transverse surface density is adjusted by adjusting the height of the T-blocks and / or the distance from both ends of the die to the electrode, maintaining closed-loop control until satisfactory. Next, based on the visual inspection results, the width dimension is adjusted by adjusting the distance from the left and right ends of the die to the electrode and / or adjusting the pump speed, maintaining closed-loop control until satisfactory. Finally, based on the thickness gauge readings, the single-point surface density is adjusted by adjusting each adjustment T-block, maintaining closed-loop control until the average surface density is reached. This closed-loop control adjustment process enables fully automatic and precise adjustment from overall surface density to width to single-point surface density, ensuring high coating quality while significantly reducing labor costs. Attached Figure Description

[0010] Figure 1 A schematic diagram of a portion of the structure of an extrusion coating machine that applies the closed-loop control method for electrode coating of the present invention.

[0011] Figure 2 This is a flowchart of the main control logic of the electrode coating closed-loop control method of the present invention;

[0012] Figure 3 This is the lateral consistency adjustment method in the closed-loop control method for electrode coating of the present invention;

[0013] Figure 4 This is the longitudinal surface density adjustment method in the closed-loop control method for electrode coating of the present invention;

[0014] Figure 5 This is a logic block diagram for adjusting the coating size in the electrode coating closed-loop control method of the present invention.

[0015] In the diagram: 1. Feed pump; 2. Die head adjustment drive mechanism; 3. Temperature probe; 4. Feed pipeline; 5. Slit-type extrusion coating die head; 6. Adjustment T-block; 7. Electrode; 8. CCD detector; 9. Back roller; 10. Dual-station online thickness gauge; 11. Die lip gap. Detailed Implementation

[0016] This invention addresses the problem that existing extrusion coating machines rely on manual adjustments when coating parameters such as coating thickness, size, and areal density fail to meet requirements, resulting in high labor costs. By implementing closed-loop control and adjustment of each detection parameter when requirements are not met, labor costs can be significantly reduced while ensuring coating requirements are met.

[0017] To facilitate understanding of the electrode coating closed-loop control method of the present invention, firstly, in conjunction with... Figure 1 The structure of the extrusion coating machine used in the control method of this invention is described below. For example... Figure 1 After being unwound, the coiled electrode sheet 7 is wound around the back roller 9. A slit-type extrusion coating die 5 is provided on the front side of the back roller 9, which is the opposite side of the electrode sheet 7. The slit-type extrusion coating die 5 forms a coating on the electrode sheet 7 by passing through the die lip gap 11 towards the electrode coating material wound on the back roller 9. A feed pipe 4 is connected to the front side of the slit-type extrusion coating die 5. An extrusion channel is provided inside the slit-type extrusion die 5. The coating material passing through the feed pipe 4 enters the extrusion channel and is discharged through the die lip gap 11.

[0018] The slit-type extrusion coating die 5 is equipped with a group of adjusting T-blocks 6. Multiple adjusting T-blocks 6 are arranged along the length of the extrusion channel. Each adjusting T-block 6 is equipped with an adjusting T-block drive mechanism that drives it to move vertically to adjust the opening of the extrusion channel. When the adjusting T-block 6 moves upward and the opening increases, the flow rate of the extrusion channel at the corresponding position of the adjusting T-block 6 increases, and the coating thickness at the corresponding position on the electrode increases. When the adjusting T-block 6 moves downward and the opening decreases, the flow rate of the extrusion channel at the corresponding position of the adjusting T-block 6 decreases, and the coating thickness at the corresponding position on the electrode decreases. At both ends of the slit-type extrusion coating die 5, i.e., at both ends in the electrode width direction, die head adjustment drive mechanisms 2 are respectively provided. The die head adjustment drive mechanisms 2 can drive the two ends of the slit-type extrusion coating die 5 to move closer to and away from the electrode. When moving away from the electrode, the coating thickness of the electrode increases; when moving closer to the electrode, the coating thickness of the electrode decreases. The feed line 4 is connected to the feed pump 1, which supplies coating to the slit extrusion coating die 5. When the pump speed increases, the feed flow rate increases, and when the pump speed decreases, the feed flow rate decreases.

[0019] A CCD detector 8 and a dual-station online thickness gauge 10 are configured on the downstream side of the back roller 9, i.e., the side after coating. The CCD detector 8 is used to detect the width of the coating, and the dual-station online thickness gauge 10 is used to detect the thickness of the coating. One of the thickness gauges in the dual-station online thickness gauge is used to detect the overall thickness of the coating to obtain data on the longitudinal and transverse areal densities, and the other thickness gauge is used to detect the thickness of the coating edge.

[0020] A temperature probe 3 is installed on the feed pipeline 4. The temperature probe 3 is used to detect the temperature of the coating material that is about to be fed into the slit extrusion coating die 5, so as to ensure that the coating temperature is qualified.

[0021] The slit-type extrusion coating die, the die feeding method, the die coating method, and the adjustment of the die end positions and the extrusion channel mentioned above are all existing methods used in existing extrusion coating machines. Compared with existing coating machines, the extrusion coating machine used in the electrode coating closed-loop control method of this invention uses a dual-station online thickness gauge and is equipped with a new control module. The CCD detector, the dual-station online thickness gauge, and the temperature probe are all connected to the control module to transmit detection data to the control module. The adjustment T-block drive mechanism, the die head adjustment drive mechanism, and the feed pump are all connected to the control module for control.

[0022] The specific implementation of the electrode coating closed-loop control method of the present invention is as follows:

[0023] First, temperature probe 3 transmits the detected temperature signal of the coating material in the feed pipeline to the control module. If the coating temperature is not up to standard, the entire coating process will stop, and the system will automatically control or issue a warning signal for manual control to heat the coating material until it reaches the required temperature. Once the coating temperature is within the acceptable range, the machine will initiate the following closed-loop control process.

[0024] Closed-loop control process as follows Figure 2 As shown, the control and adjustment steps are performed in the following sequence: overall surface density adjustment, width dimension adjustment, and single-point surface density adjustment. At the beginning of each of these control steps, a CCD detector and a dual-station online thickness gauge are used to perform a full scan of the electrode sheet, with the scan cycle set within 4-10 seconds; that is, the electrode sheet is continuously scanned according to the scan cycle.

[0025] The overall surface density adjustment process includes longitudinal surface density adjustment and transverse surface density adjustment. Longitudinal surface density adjustment specifically involves: determining whether the longitudinal surface density of the coating meets the average surface density requirement based on the thickness gauge readings; if the longitudinal surface density is within the required range, proceeding to the next step, transverse surface density adjustment; if the longitudinal surface density exceeds the required range but is within the set tolerance range, adjusting the pump speed of the die head feed pump until the longitudinal surface density meets the required range, then maintaining the pump speed; if the longitudinal surface density exceeds the required range and exceeds the set tolerance range (the deviation is too large for automatic adjustment to achieve the desired result), an alarm is triggered, requiring manual inspection and maintenance.

[0026] Specifically, such as Figure 4As shown, if the overall longitudinal areal density of the coating does not meet the average requirement and is higher than the average, when it exceeds the average by more than 5%, it exceeds the set tolerance range. In this case, the control module controls the alarm module to sound an alarm, and the issue is handled through manual inspection and maintenance. When it is between 3-5% higher than the average, the pump speed is adjusted (decelerated) with a scale of 1 rpm, depending on the specific test results. The adjustment amount can be 1 rpm or n rpm each time, aiming to adjust it to be close to the average requirement as quickly as possible. When it is between 2-3% higher than the average, the pump speed is adjusted (decelerated) with a scale of 0.8 rpm, depending on the specific test results. The adjustment amount can be 0.8 rpm or n*0.8 rpm each time, aiming to adjust it to be close to the average requirement as quickly as possible. When it is between 1-2% higher than the average, the specific adjustment is determined based on the test results. For pump speed adjustments (deceleration), use 0.5 rpm increments. Adjustments can be made in increments of 0.5 rpm or n*0.5 rpm, aiming to quickly bring the speed close to the average. When the speed is 0.5-1% above the average, adjust the pump speed (deceleration) in increments of 0.2 rpm, based on the test results. Adjustments can be made in increments of 0.2 rpm or n*0.2 rpm, aiming to quickly bring the speed close to the average. When the speed is within 0.5%, adjust the pump speed (deceleration) in increments of 0.1 rpm, based on the test results. Adjustments can be made in increments of 0.1 rpm or n*0.1 rpm, aiming to quickly bring the speed close to the average (deviation no greater than 0.1%).

[0027] Conversely, if the overall longitudinal areal density of the coating does not meet the average requirement and is lower than the average, when it is more than 5% below the average, it exceeds the set tolerance range. In this case, the control module will trigger an alarm, requiring manual inspection and maintenance. When it is 3-5% below the average, the pump speed will be adjusted (increased speed) in increments of 1 rpm, depending on the specific test results. Adjustments can be made in increments of 1 rpm or n rpm, aiming to quickly bring it close to the average requirement. When it is 2-3% below the average, the pump speed will be adjusted (increased speed) in increments of 0.8 rpm, depending on the specific test results. Adjustments can be made in increments of 0.8 rpm or n*0.8 rpm, aiming to quickly bring it close to the average requirement. When it is 1-2% below the average, the specific adjustment will be made based on the specific test results. The pump speed is adjusted (increased speed) in increments of 0.5 rpm. Adjustments can be made in increments of 0.5 rpm or n*0.5 rpm, aiming to quickly bring it close to the average requirement. When the speed is between 0.5% and 1% below the average, the pump speed is adjusted (increased speed) in increments of 0.2 rpm, based on the test results. Adjustments can be made in increments of 0.2 rpm or n*0.2 rpm, aiming to quickly bring it close to the average requirement. When the speed is within 0.5%, the pump speed is adjusted (increased speed) in increments of 0.1 rpm, based on the test results. Adjustments can be made in increments of 0.1 rpm or n*0.1 rpm, aiming to quickly bring it close to the average requirement (deviation no greater than 0.1%).

[0028] The overall principle of the above adjustment strategy is that the larger the deviation, the larger the adjustment scale value; the smaller the deviation, the smaller the adjustment scale value, in order to achieve fast and accurate adjustment. The specific classification of deviation values ​​and the adjustment scale value within each deviation level can be set according to needs. The above deviation value classification and adjustment scale value within each deviation level are only one specific embodiment and do not limit the scope of the invention.

[0029] After each adjustment is completed, wait for the test data to be refreshed 2-3 times, and then determine whether the longitudinal surface density is qualified based on the latest test data. If it is not qualified, repeat the above adjustment process. If it is qualified, proceed to the next adjustment step.

[0030] After adjusting the longitudinal surface density to the average range, the consistency of the transverse surface density of the coating is judged based on the test results of the thickness gauge. If the transverse surface density consistency is qualified, the next step, namely the width dimension adjustment, is carried out. If the transverse surface density consistency is not qualified, but the deviation is within the set tolerance range, the distance from both ends of the die head to the electrode is adjusted individually, or the height of the adjustment T-block is adjusted individually, or both the distance from both ends of the die head to the electrode and the height of the adjustment T-block are adjusted until the transverse surface density consistency is qualified. If the transverse surface density consistency is not qualified, and the deviation exceeds the set tolerance range (the deviation is too large, and the adjustment purpose cannot be achieved by automatic adjustment), an alarm is triggered, and manual inspection and maintenance are required.

[0031] Specifically, several points are selected as reference points along the width of the electrode. Each point corresponds to a certain range along the width. The coating surface contour is fitted based on the data of the selected points detected by the thickness gauge. If the coating surface contour fitted by all the selected points is an undulating curve, the height of the adjustment T-blocks corresponding to these selected points is adjusted until all the selected points can fit a straight line.

[0032] Specifically, when adjusting the height of the corresponding adjustment T-block, such as Figure 3 As shown, if the overall longitudinal areal density of the coating does not meet the average requirement and is higher than the average, when it exceeds the average by more than 5%, it exceeds the set tolerance range. In this case, the control module controls the alarm module to sound an alarm, and the issue is handled through manual inspection and maintenance. When it is between 3-5% higher than the average, the height of the adjustment T-block is adjusted (reduced) in increments of 40μm, depending on the magnitude of the test results. The adjustment amount can be 40μm each time, or an integer multiple of 40μm each time, to adjust it to be close to the average requirement as quickly as possible. When it is between 2-3% higher than the average, the height of the adjustment T-block is adjusted (reduced) in increments of 30μm, depending on the magnitude of the test results. The adjustment amount can be 30μm each time, or an integer multiple of 40μm each time. The adjustment amount should be an integer multiple of 30μm, aiming to adjust it to be close to the mean requirement as quickly as possible; when it is between 1-2% higher than the mean, the height of the adjustment T-block should be adjusted (reduced) with a scale value of 20μm / time, depending on the size of the test results. The adjustment amount can be 20μm each time, or an integer multiple of 20μm each time, aiming to adjust it to be close to the mean requirement as quickly as possible; when it is between 0.5-1% higher than the mean, the height of the adjustment T-block should be adjusted (reduced) with a scale value of 10μm / time, depending on the size of the test results. The adjustment amount can be 10μm each time, or an integer multiple of 10μm each time, aiming to adjust it to be close to the mean requirement as quickly as possible (deviation not greater than 0.5%).

[0033] Conversely, if the overall transverse areal density of the coating does not meet the average requirement and is lower than the average, when it is more than 5% lower than the average, it exceeds the set tolerance range. In this case, the control module will trigger an alarm, requiring manual inspection and maintenance. When it is between 3-5% lower than the average, the height of the adjustment T-block will be adjusted (increased) in increments of 40μm, depending on the specific test results. Each adjustment can be 40μm or an integer multiple of 40μm, aiming to quickly bring it close to the average requirement. When it is between 2-3% lower than the average, the height of the adjustment T-block will be adjusted (increased) in increments of 30μm, depending on the specific test results. Each adjustment can be 30μm or an integer multiple of 40μm, aiming to quickly bring it close to the average requirement. The adjustment increments should be multiples of 30 μm, aiming to bring the height close to the mean as quickly as possible. When the height is 1-2% below the mean, the height of the adjustment T-block should be adjusted (increased) in increments of 20 μm, depending on the test results. Each adjustment increment can be 20 μm or multiples of 20 μm, aiming to bring the height close to the mean as quickly as possible. When the height is 0.5-1% below the mean, the height of the adjustment T-block should be adjusted (increased) in increments of 10 μm, depending on the test results. Each adjustment increment can be 10 μm or multiples of 10 μm, aiming to bring the height close to the mean as quickly as possible (deviation not greater than 0.5%).

[0034] Similarly, the overall principle of the above adjustment strategy is that the larger the deviation, the larger the adjustment scale value for each step; and the smaller the deviation, the smaller the adjustment scale value for each step, aiming to achieve fast and accurate adjustment. The specific classification of deviation values ​​and the adjustment scale value within each deviation level can be set according to needs. The above deviation value classification and adjustment scale value within each deviation level are merely one specific embodiment and do not limit the scope of the invention.

[0035] If a straight line can be fitted to all selected points with a slope of 0, it indicates good consistency in the lateral areal density of the coating across the entire electrode width. If the slope of the fitted line is not 0, it indicates that the areal density of the coating gradually changes from one side to the other across the electrode width. In this case, reduce the distance between the die and the electrode on the side with a thicker coating, or increase the distance between the die and the electrode on the side with a thinner coating, to make the slope of the fitted line approach 0; or lower the height of the adjustment T-block on the side with a thicker coating, or increase the height of the adjustment T-block on the side with a thinner coating, to make the slope of the fitted line approach 0.

[0036] In practice, the number of selected points is determined based on the length of the entire mold lip gap. The number of selected points should not be too small, otherwise it may lead to inaccurate lateral consistency detection and adjustment. At the same time, the number of selected points should not be too large, otherwise it may lead to overly cumbersome detection or adjustment. Furthermore, the width range occupied by the selected points is based on the width of an integer number of adjustment T-blocks. In one embodiment, the width range occupied by the selected points is set to 20mm or 40mm, based on the width of one or two adjustment T-blocks.

[0037] In the above adjustment process, after each adjustment is completed, wait for the detection data to be refreshed 2-3 times, and then judge whether the adjustment purpose has been achieved based on the latest detection data. If the adjustment purpose has not been achieved, repeat the above adjustment process. If the adjustment purpose has been achieved, proceed to the next adjustment step.

[0038] By adjusting the longitudinal and transverse areal densities, the overall quality of the coating within a unit length and electrode width range is controlled. Then, the coating width and single-point areal densities are adjusted. This method, from overall adjustment and coarse adjustment to local adjustment and fine adjustment, has high adjustment efficiency.

[0039] After adjusting the overall areal density to the required range, the width dimension is adjusted. The general principle for width adjustment is to consider both the distance from the left and right ends of the die head to the electrode and the pump speed adjustment, ensuring that both the average longitudinal and transverse areal density values ​​meet the requirements. Adjusting the pump speed may cause changes in the overall areal density. Therefore, during width adjustment, priority is given to adjusting the distance from the left and right ends of the die head to the electrode. If this does not cause the areal density to exceed the requirements, the pump speed is kept constant. If it does cause the areal density to exceed the requirements, the pump speed is adjusted.

[0040] Specifically, such as Figure 5 As shown, the coating width is determined based on data from the CCD detector. If the coating width is greater than the standard value, the coating width is initially reduced by increasing the GAP value (the distance from the left and right ends of the die to the electrode), with fine adjustments in 1μm increments. If adjusting the GAP value affects the overall areal density, causing it to increase, the pump speed of the feed pump is appropriately reduced, with fine adjustments in 0.1rpm increments. If the coating width is less than the standard value, the coating width is initially increased by reducing the GAP value (the distance from the left and right ends of the die to the electrode), with fine adjustments in 1μm increments. If adjusting the GAP value affects the overall areal density, causing it to decrease, the pump speed of the feed pump is appropriately increased, with fine adjustments in 0.1rpm increments. This process continues until the width is within ±0.5mm of the standard size.

[0041] In the above adjustment process, after each adjustment is completed, wait for the detection data to be refreshed 2-3 times, and then judge whether the adjustment purpose has been achieved based on the latest detection data. If the adjustment purpose has not been achieved, repeat the above adjustment process. If the adjustment purpose has been achieved, proceed to the next adjustment step.

[0042] Once the overall areal density and width dimensions are within acceptable limits, single-point areal density adjustment is performed based on the thickness data detected by the thickness gauge. Single-point areal density adjustment involves determining whether the areal density of the coating at each adjustment T-block equals the midpoint of the average areal density range based on the thickness gauge readings. The height of each adjustment T-block is then adjusted until the areal density equals the midpoint of the average areal density range. This adjustment process requires raising some adjustment T-blocks and lowering others, ensuring that the overall areal density remains within the required range without significant changes. Ultimately, this results in better consistency of the lateral areal density across the entire electrode width, bringing it closer to the standard value.

[0043] In addition, during the entire closed-loop control process described above, the coating edge thickness is detected in real time by another thickness gauge in the dual-station online thickness gauge. When the coating edge thickness is less than the set minimum edge thickness value, it indicates that edge thinning has occurred, and at this time the control module controls the alarm module to sound an alarm.

[0044] After the above adjustments are completed, the control module enters continuous maintenance mode to ensure the stability of the coating state. Generally, it is only necessary to control the single-point surface density and the left and right GAP values, which are fine-tuning in process monitoring, and the parameter fluctuations are usually small.

[0045] The electrode coating closed-loop control method of the present invention described above can monitor and adjust coating density and dimensional anomalies in real time, which can reduce manpower and reduce scrap caused by manual adjustment, thereby improving yield.

[0046] The above embodiments are preferred embodiments of the present invention and should not be construed as limiting the present invention. For example, in other embodiments, if other measures are already in place to ensure the coating temperature in the supply pipeline, then it is not necessary to perform a judgment process to check whether the die head feeding temperature meets the coating requirements before performing the closed-loop control process.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A closed-loop control method for electrode coating, characterized in that, Including closed-loop control process: The closed-loop control process includes sequential overall surface density adjustment, width dimension adjustment, and single-point surface density adjustment. The overall surface density adjustment includes determining whether the longitudinal surface density of the coating meets the average surface density requirement based on the thickness gauge test results. If not, and the deviation is within the set tolerance range, the pump speed of the die head feed pump is adjusted until the longitudinal surface density meets the requirement. Then, the pump speed is kept constant. If not, and the deviation exceeds the set tolerance range, an alarm is triggered. After that, the consistency of the transverse surface density of the coating is determined. If not, and within the set tolerance range, the distance from both ends of the die head to the electrode plate and / or the height of the T-block are adjusted until the transverse surface density consistency is qualified. If not, and exceeding the set tolerance range, an alarm is triggered. Width adjustment includes determining whether the coating width is acceptable based on a vision inspection instrument. If not, adjust the distance from the left and right ends of the die head to the electrode and / or adjust the pump speed until the coating width is acceptable. Single-point surface density adjustment includes determining whether the surface density of the coating at each adjustment T-block is equal to the midpoint of the average surface density range based on the detection results of the thickness gauge, and adjusting the height of each adjustment T-block until the surface density is equal to the midpoint of the average surface density range.

2. The closed-loop control method for electrode coating according to claim 1, characterized in that, Set the scanning and inspection cycle of the thickness gauge and the vision inspection instrument. When adjusting the pump speed, the height of the T-block, and the distance from the left and right ends of the mold head to the electrode, refresh the inspection results 2-3 times after each adjustment. Then, determine whether to perform the next adjustment action based on the refreshed inspection results.

3. The closed-loop control method for electrode coating according to claim 2, characterized in that, The scan cycle is 4-10 seconds.

4. The closed-loop control method for electrode coating according to any one of claims 1-3, characterized in that, When judging the consistency of the transverse surface density, multiple points are selected in the coating width direction and the coating surface contour line is fitted. If the coating surface contour line is an undulating curve, the height of the adjustment T block is adjusted until the coating surface contour line tends to be straight. When the coating surface contour line tends to be straight, the distance from the left and right ends of the die head to the electrode sheet is adjusted according to the slope of the coating surface contour line, or the height of the T block is adjusted on the half side in the width direction of the electrode sheet, until the slope tends to be 0.

5. The closed-loop control method for electrode coating according to claim 4, characterized in that, When the contour line of the coating surface is an undulating curve and the adjustment T-block of the die head is adjusted, the coating is divided into several length units in the width direction by the area where the point selected when fitting the straight line is located. Each length unit corresponds to at least one adjustment T-block. The contour line of the coating surface is adjusted to a straight line by adjusting the height of the adjustment T-block corresponding to the length unit.

6. The closed-loop control method for electrode coating according to claim 5, characterized in that, The width of the coating corresponding to each length unit is between 20mm and 40mm.

7. The closed-loop control method for electrode coating according to any one of claims 1-3, characterized in that, During the width adjustment process, the distance from both ends of the mold head to the electrode plate and the pump speed are considered to adjust the width while ensuring that the average longitudinal surface density and the consistency of the transverse surface density meet the requirements.

8. The closed-loop control method for electrode coating according to claim 7, characterized in that, During the width adjustment process, prioritize adjusting the distance from the left and right ends of the die head to the electrode. Keep the pump speed constant as long as it does not cause the areal density to exceed the requirements. If the areal density exceeds the requirements, adjust the pump speed.

9. The closed-loop control method for electrode coating according to any one of claims 1-3, characterized in that, Throughout the closed-loop control process, the coating edge thickness is monitored in real time, and an alarm is triggered when the coating edge thickness is less than the set minimum edge thickness value.

10. The closed-loop control method for electrode coating according to any one of claims 1-3, characterized in that, Before implementing the closed-loop control process, the temperature of the die head feed is checked to see if it meets the coating requirements. If not, the feed temperature is adjusted until it meets the coating requirements, and then the closed-loop control process is implemented.

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