Gap Coating Longitudinal Basis Weight Adjustment Method, System, Controller and Medium

Abstract

The present invention discloses a method, system, controller and medium for adjusting the longitudinal surface density in gap coating. The method for adjusting the longitudinal surface density in gap coating includes: acquiring in real time the coating pressure data during the coating process and generating a corresponding coating pressure curve; judging whether the longitudinal surface density in gap coating is consistent according to the coating pressure curve; when the judgment result is negative, adjusting the opening speed of the coating valve and the coating reflux pressure in the coating stop state so that the longitudinal surface density in gap coating is consistent. In the present invention, it is possible to quickly judge the consistency of the longitudinal surface density in gap coating according to the change of the coating pressure in real time, and adjust the opening speed of the coating valve and the coating reflux pressure in the coating stop state to ensure coating consistency and avoid the problem of batch scrapping of the electrode caused by inconsistent longitudinal surface density in gap coating during the gap coating process.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a method, system, controller and medium for adjusting the longitudinal surface density of gap coating. Background Art

[0002] With the widespread use of digital products such as mobile phones and laptop computers, lithium-ion batteries have been widely used in such products due to their excellent performance and are gradually developing into other product application fields. The production and manufacturing of lithium-ion batteries is a process tightly linked by individual process steps. Among them, the electrode coating process is of great significance to the capacity, consistency, safety, etc. of lithium batteries.

[0003] Currently, during the debugging process of the coating process, it is necessary to first coat several sheets, then dry them in an oven, and then take the sheets at the tail of the machine and perform rounding and weighing. After analyzing the weighing data, the next debugging is carried out. Since this debugging process consumes a lot of time, and the long-term debugging will also cause the slurry to stand still in the die head, resulting in unstable slurry and affecting the coating consistency. In addition, when controlling the coating process, the industry usually uses X / Beta to detect the surface density of the electrode, but it cannot detect the abnormal weight at the head and tail of the gap coating, which is likely to cause batch scrapping.

[0004] Therefore, in the prior art, there are problems that it is impossible to detect the abnormal weight at the head and tail of the gap coating, it is impossible to ensure the coating consistency, and it is easy to cause batch scrapping of the electrode. Summary of the Invention

[0005] Based on this, it is necessary to provide a method, device, system, controller and medium for adjusting the longitudinal surface of the coating to solve the problems in the prior art that it is impossible to detect the abnormal weight at the head and tail of the gap coating, it is impossible to ensure the coating consistency, and it is easy to cause batch scrapping.

[0006] In a first aspect, a method for adjusting the longitudinal surface density of gap coating is provided, including:

[0007] Obtain the coating pressure data during the coating process in real time and generate a corresponding coating pressure curve;

[0008] Judge whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve;

[0009] When it is determined that the longitudinal surface density of the gap coating is inconsistent, adjust the opening speed of the coating valve and the coating reflux pressure in the coating stop state to make the longitudinal surface density of the gap coating consistent.

[0010] Further, judging whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve includes:

[0011] Determine the correlation between the coating pressure and the weight of the head of the electrode sheet;

[0012] Determine the weight of the head of the electrode sheet according to the coating pressure curve and the correlation;

[0013] Judge whether the weight of the head of the electrode sheet is consistent with the preset weight of the middle part of the electrode sheet;

[0014] When it is judged that the weight of the head of the electrode sheet is consistent with the preset weight of the middle part of the electrode sheet, it is determined that the longitudinal surface density of the slot coating is consistent;

[0015] When it is judged that the weight of the head of the electrode sheet is inconsistent with the preset weight of the middle part of the electrode sheet, it is determined that the longitudinal surface density of the slot coating is inconsistent.

[0016] Further, the adjustment of the opening speed of the coating valve and the paint reflux pressure in the coating stop state includes:

[0017] When the weight of the head of the electrode sheet is greater than the preset weight of the middle part of the electrode sheet, reduce the opening degree of the reflux valve to reduce the paint reflux pressure and lower the opening speed of the coating valve;

[0018] When the weight of the head of the electrode sheet is less than the preset weight of the middle part of the electrode sheet, increase the opening degree of the reflux valve to increase the paint reflux pressure and increase the opening speed of the coating valve.

[0019] Further, before judging whether the longitudinal surface density of the slot coating is consistent according to the coating pressure curve, it further includes:

[0020] Judge whether the current coating pressure value conforms to the preset coating pressure value according to the coating pressure data;

[0021] When the current coating pressure value conforms to the preset coating pressure value, obtain the paint reflux pressure value in the coating stop state and judge whether the paint reflux pressure value in the coating stop state conforms to the preset paint reflux pressure value;

[0022] When the paint reflux pressure value in the coating stop state does not conform to the preset paint reflux pressure value, judge whether the longitudinal surface density of the slot coating is consistent according to the coating pressure curve.

[0023] Further, the method for adjusting the longitudinal surface density of the slot coating further includes:

[0024] Extract the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet according to the coating pressure curve;

[0025] Compare the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet with the average value of the pressure at the middle part of the electrode sheet respectively;

[0026] When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average value of the pressure in the middle of the electrode sheet both exceed the first preset pressure value, a warning message is output;

[0027] When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average value of the pressure in the middle of the electrode sheet both exceed the second preset pressure value, an alarm message is output;

[0028] Wherein, the first preset pressure value is less than the second preset pressure value.

[0029] Furthermore, the coating pressure data is acquired in real time, and a corresponding coating pressure curve is generated, including:

[0030] The coating pressure data acquired by a coating pressure sensor preset on the material conveying pipeline of the coater is acquired in real time, and the coating pressure sensor is arranged between the gap valve and the coating die head;

[0031] The coating pressure data is converted into an analog signal, and a coating pressure curve is generated;

[0032] The coating pressure curve is displayed in a corresponding display interface.

[0033] In a second aspect, the present invention also provides a coating system, including:

[0034] A coater, on the material conveying pipeline of the coater, a coating pressure sensor is arranged, and the coating pressure sensor is arranged between the gap valve and the coating die head, and is used for acquiring coating pressure data;

[0035] A control unit, which is used for converting the coating pressure data into an analog signal and sending it to an industrial control computer;

[0036] The industrial control computer is used for acquiring the coating pressure data converted into an analog signal and executing the steps of the above-mentioned longitudinal surface density adjustment method for gap coating.

[0037] Furthermore, the gap valve includes:

[0038] A reflux valve and a coating valve;

[0039] The reflux valve is used for when the longitudinal surface density of the gap coating is inconsistent, in the state of coating stop, by adjusting the opening degree of the reflux valve, to adjust the coating reflux pressure, so that the longitudinal surface density of the gap coating is consistent;

[0040] The coating valve is used for when the longitudinal surface density of the gap coating is inconsistent, by adjusting the opening speed of the coating valve, so that the longitudinal surface density of the gap coating is consistent.

[0041] In a third aspect, a controller is provided, including a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor. When the processor executes the computer-readable instructions, the steps of the above-mentioned gap coating longitudinal surface density adjustment method are implemented.

[0042] In a fourth aspect, one or more readable storage media are provided. The readable storage media store computer-readable instructions, and when the computer-readable instructions are executed by a processor, the steps of the above-mentioned gap coating longitudinal surface density adjustment method are implemented.

[0043] In the solutions implemented by the above-mentioned gap coating longitudinal surface density adjustment method, system, controller, and medium, by obtaining the coating pressure data during the coating process in real time and generating a corresponding coating pressure curve; according to the coating pressure curve, judging whether the gap coating longitudinal surface density is consistent; when the judgment is negative, adjusting the coating pressure during the coating process and the paint reflux pressure in the coating stop state, so that the gap coating longitudinal surface density is consistent. In the present invention, the consistency of the gap coating longitudinal surface density can be quickly judged according to the change of the coating pressure in real time, and the opening speed of the coating valve and the paint reflux pressure in the coating stop state are adjusted to ensure the coating consistency and avoid the problem of batch scrapping of the electrode due to inconsistent gap coating longitudinal surface density during the gap coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic diagram of an application environment of the gap coating longitudinal surface density adjustment method in an embodiment of the present invention;

[0046] Figure 2 is a flowchart of the implementation of a gap coating longitudinal surface density adjustment method provided in Embodiment 1 of the present invention;

[0047] Figure 3 shows a graph of the change in coating pressure provided in an embodiment of the present invention;

[0048] Figure 4 shows a graph of the coating pressure at the head of the electrode provided in an embodiment of the present invention;

[0049] Figure 5 is a schematic structural diagram of a gap coating longitudinal surface density adjustment device provided in Embodiment 2 of the present invention;

[0050] Figure 6 It is a schematic structural diagram of a coating system provided in Embodiment 3 of the present invention;

[0051] Figure 7 It is a schematic diagram of a gap-coated electrode provided in an embodiment of the present invention;

[0052] Figure 8 It is a schematic diagram of a controller in an embodiment of the present invention. Specific embodiments

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] The method for adjusting the longitudinal surface density of gap coating provided in this embodiment can be applied in an application environment such as Figure 1 . Among them, the coater communicates with the control unit, and the control unit communicates with the industrial computer. The control unit can be a (Programmable Logic Controller, PLC) unit, which is used to convert the coating pressure data obtained by the pressure sensor set on the coater into an analog signal and send it to the industrial computer. The industrial computer can generate a corresponding coating pressure curve according to the coating pressure data converted into an analog signal, and further judge the consistency of the longitudinal surface density of the gap coating according to the coating pressure curve, so as to correspondingly adjust the opening speed of the coating valve and the backflow pressure in the coating stop state.

[0055] Embodiment 1

[0056] Figure 2 The implementation process of a method for adjusting the longitudinal surface density of gap coating provided in Embodiment 1 of the present invention is shown, including the following steps:

[0057] In step S110, the coating pressure data during the coating process is obtained in real time, and a corresponding coating pressure curve is generated;

[0058] In the embodiment of the present invention, a coating pressure sensor is pre-set on the feed pipe of the coater, and the coating pressure data during the coating process is obtained through the coating pressure sensor, and a corresponding coating pressure curve is generated.

[0059] See Figure 3, a coating pressure change curve graph is provided to display the change curve of the coating pressure. Among them, the abscissa is the coating distance, the ordinate is the coating pressure value, and the maximum value is the maximum pressure value that the coating pressure can reach. When exceeding this maximum pressure value, an alarm needs to be given.

[0060] Among them, the coating pressure data during the coating process is obtained in real time and the corresponding coating pressure curve is generated, including:

[0061] The coating pressure data collected by the coating pressure sensor pre-set on the material feeding pipeline of the coater is obtained in real time. The coating pressure sensor is arranged between the gap valve and the coating die head;

[0062] The coating pressure data is converted into an analog signal and the coating pressure curve is generated;

[0063] The coating pressure curve is displayed in the corresponding display interface.

[0064] Specifically, the coating pressure data is obtained in real time through the pre-set coating pressure sensor, the coating pressure data is converted into an analog signal by the PLC unit and sent to the industrial control computer. The industrial control computer uses the pre-developed software for pressure data and the display interface to generate the corresponding pressure curve according to the preset curve model for the coating pressure data converted into virtual signals, and displays it in the display interface provided by the industrial control computer, so that the operator can directly judge the consistency of the longitudinal surface density of the gap coating through the change trend of the pressure curve displayed on the interface, so as to adjust the longitudinal surface density of the gap coating in time.

[0065] Furthermore, the curve model can be a curve graph, a bar graph or a histogram. According to specific requirements, the coating pressure data is used to generate the corresponding pressure curve to visually display the change trend of the coating pressure.

[0066] Among them, the coating pressure sensor can be the Kien-type pressure sensor GP-M010, with a faster acquisition speed and higher accuracy.

[0067] See Figure 4 , in an embodiment, a coating pressure curve graph of the head of the electrode sheet is also provided. Among them, the abscissa is the coating distance, the ordinate is the coating pressure value of the head of the electrode sheet, the statistical curve A is the preset standard pressure change curve, and the current curve B is the coating pressure curve of the head of the electrode sheet during the coating process. By comparing the statistical curve A and the current curve B, the corresponding percentage value can be obtained. When the percentage value meets the preset value, it indicates that the longitudinal surface density of the gap coating is consistent. When the percentage value exceeds the preset value, an alarm is triggered to adjust the longitudinal surface density of the gap coating, which can greatly reduce the outflow of the weight defect at the head and tail of the electrode sheet, improve the safety performance of the finished battery, and at the same time improve the consistency of the battery capacity.

[0068] In step S120, according to the coating pressure curve, it is judged whether the longitudinal surface density of the slot coating is consistent;

[0069] In the embodiment of the present invention, according to the coating pressure curve, the change trend of the coating pressure of the electrode sheet can be determined, and according to this change trend of the coating pressure, it can be further determined whether the longitudinal surface density of the slot coating is consistent. For example, if the change trend fluctuates greatly, it can be considered that the longitudinal surface density of the slot coating is inconsistent; if the change trend is relatively stable, it can be considered that the longitudinal surface density of the slot coating is consistent.

[0070] In an embodiment of the present invention, to judge whether the longitudinal surface density of the slot coating is consistent, it can be judged by the following method:

[0071] Determine the correlation between the coating pressure and the weight of the head of the electrode sheet;

[0072] According to the coating pressure curve and the correlation, determine the weight of the head of the electrode sheet;

[0073] Judge whether the weight of the head of the electrode sheet is consistent with the preset weight of the middle part of the electrode sheet;

[0074] When it is judged that the weight of the head of the electrode sheet is consistent with the preset weight of the middle part of the electrode sheet, it is determined that the longitudinal surface density of the slot coating is consistent;

[0075] When it is judged that the weight of the head of the electrode sheet is inconsistent with the preset weight of the middle part of the electrode sheet, it is determined that the longitudinal surface density of the slot coating is inconsistent.

[0076] Specifically, by collecting the coating pressure values under different reflux pressures, the corresponding coating pressure curve is generated to determine the change trend of the coating pressure. By collecting the longitudinal coating weights under different reflux pressures in advance to generate the corresponding longitudinal coating weight curve, the change trends of the weights of the head and tail of the longitudinal coating electrode sheet can be determined according to the longitudinal coating weight curve. By comparing the change trend of the coating pressure with the change trends of the weights of the head, middle and tail of the longitudinal coating electrode sheet, it can be seen that the change trend of the coating pressure is consistent with the change trends of the weights of the head and tail of the longitudinal coating electrode sheet, with a certain correlation, that is, the greater the coating pressure, the greater the weight of the head of the electrode sheet. By separately extracting the data of the weights of the head, middle and tail of the electrode sheet and the coating pressure for correlation analysis and fitting, the coefficient of determination R 2 > 85%, and this coefficient of determination represents the proportion of the common variance between two variables. It can be obtained that the weight of the electrode sheet = -5.831 + 0.005490 * pressure - 0.000001 * pressure 2The correlation formula, where the weight of the electrode tab can be the weight of the head of the electrode tab, the weight of the tail of the electrode tab, or the weight of the middle part of the electrode tab, and the pressure can be the average coating pressure of each part of the electrode tab. For example, the average coating pressure of the head of the electrode tab. According to the obtained pressure values within multiple different coating distances and calculating their average pressure, based on this average pressure and the above formula, the weights of different positions of the electrode tab can be obtained. It can be understood that different coating slurries, the design of the coating product, and the coating equipment will all affect the weight of the electrode tab. For example, for a slurry with a higher viscosity, the weight of the electrode tab is larger, so there will be some differences in the correlation formula for the weight of the head of the electrode tab obtained.

[0077] Among them, the longitudinal weight of the coating can be obtained by weighing.

[0078] Furthermore, through the above method, the weight of the current head of the electrode tab can be determined, and further, the weight of the head of the electrode tab is compared with the preset weight of the middle part of the electrode tab. This preset weight of the middle part of the electrode tab is a pre-set standard weight value. By comparing the weight of the current head of the electrode tab with the preset weight of the middle part of the electrode tab, it is determined whether the head and the middle part of the electrode tab are consistent, so as to judge whether the longitudinal surface density of the gap coating is consistent.

[0079] Among them, when the weight of the head of the electrode tab is greater than the preset weight of the middle part of the electrode tab, that is, the weight of the head of the electrode tab is heavier compared to the preset weight of the middle part of the electrode tab. At this time, it can be considered that the weight of the head of the electrode tab is inconsistent with the preset weight of the middle part of the electrode tab, that is, the longitudinal surface density of the gap coating is inconsistent. When the weight of the head of the electrode tab is less than the preset weight of the middle part of the electrode tab, that is, the weight of the head of the electrode tab is lighter compared to the preset weight of the middle part of the electrode tab. At this time, it can be considered that the weight of the head of the electrode tab is inconsistent with the preset weight of the middle part of the electrode tab, that is, the longitudinal surface density of the gap coating is inconsistent.

[0080] Furthermore, through the above method, the weight of the tail of the electrode tab can also be obtained to judge whether the head, tail of the electrode tab and the preset weight of the middle part of the electrode tab are consistent, so as to judge whether the longitudinal surface density of the gap coating is consistent.

[0081] In an embodiment of the present invention, before judging whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve and the coating reflux pressure curve, it further includes:

[0082] According to the coating pressure data, judge whether the current coating pressure value conforms to the preset coating pressure value;

[0083] When the current coating pressure value conforms to the preset coating pressure value, obtain the coating reflux pressure value in the coating stop state, and judge whether the coating reflux pressure value in the coating stop state conforms to the preset coating reflux pressure value;

[0084] When the coating reflux pressure value in the coating stop state does not conform to the preset coating reflux pressure value, execute step S120.

[0085] Among them, the paint reflux pressure value in the coating stop state can be obtained by collecting the reflux pressure when the coating machine stops the coating operation through a paint reflux pressure sensor preset on the material conveying pipe of the coating machine. When the paint reflux pressure value does not conform to the preset paint reflux pressure value, it indicates a risk of inconsistent longitudinal surface density in the intermittent coating. At this time, it is further determined whether the longitudinal surface density of the intermittent coating is consistent. By judging the opening speed of the coating valve and the paint reflux pressure in the coating stop state, various factors affecting the longitudinal surface density of the intermittent coating can be monitored for corresponding adjustment to make the longitudinal surface density of the intermittent coating consistent.

[0086] Furthermore, among them, the paint reflux pressure sensor can be a Kien-type pressure sensor GP-M010, with a faster acquisition speed and higher accuracy.

[0087] In step S130, when the longitudinal surface density of the intermittent coating is inconsistent, the opening speed of the coating valve and the paint reflux pressure in the coating stop state are adjusted to make the longitudinal surface density of the intermittent coating consistent.

[0088] In an embodiment of the present invention, when the weight of the head of the electrode sheet is greater than the preset weight of the middle part of the electrode sheet, the opening degree of the reflux valve is reduced to reduce the paint reflux pressure and lower the opening speed of the coating valve. Specifically, when the weight of the head of the electrode sheet is greater than the preset weight of the middle part of the electrode sheet, the opening degree of the reflux valve can be reduced to reduce the paint reflux pressure, and the opening speed of the coating valve can be lowered to reduce the weight of the head of the electrode sheet, so that the weight of the head of the electrode sheet is consistent with the weight of the middle part of the electrode sheet.

[0089] In an embodiment of the present invention, when the weight of the head of the electrode sheet is less than the preset weight of the middle part of the electrode sheet, the opening degree of the reflux valve is increased to increase the paint reflux pressure and raise the opening speed of the coating valve. Specifically, when the weight of the head of the electrode sheet is less than the preset weight of the middle part of the electrode sheet, the opening degree of the reflux valve can be increased to increase the paint reflux pressure, and the opening speed of the coating valve can be raised to increase the weight of the head of the electrode sheet, so that the weight of the head of the electrode sheet is consistent with the weight of the middle part of the electrode sheet.

[0090] See Figure 7 , a schematic diagram of an intermittent coating electrode sheet is provided, including a substrate 20, a head position 16 of the electrode sheet, a middle position 17 of the electrode sheet, and a tail position 18 of the electrode sheet. The head position, middle position, and tail position of the electrode sheet can be three equally divided parts of the substrate, and the weights of the head position, middle position, and tail position of the electrode sheet can be determined through the correlation between the coating pressure curve and the weight of the electrode sheet.

[0091] In an embodiment of the present invention, the method further includes the following steps:

[0092] Extract the head pressure and tail pressure of the electrode sheet according to the coating pressure curve;

[0093] Compare the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet with the average pressure at the middle of the electrode sheet respectively;

[0094] When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average pressure at the middle of the electrode sheet both exceed the first preset pressure value, output a warning message;

[0095] When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average pressure at the middle of the electrode sheet both exceed the second preset pressure value, output an alarm message;

[0096] Wherein, the first preset pressure value is less than the second preset pressure value.

[0097] Specifically, according to the coating pressure curve, the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet under the pressure curve can be directly extracted, and the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet are compared with the average pressure at the middle of the electrode sheet respectively. When the ratios to the average pressure at the middle of the electrode sheet both exceed the first preset pressure value, output a warning message. That is, at this time, there is a risk that the weight of the head of the electrode sheet, the weight of the tail and the weight of the middle of the electrode sheet are inconsistent, and a warning is needed to timely adjust the opening speed of the coating valve and the reflux pressure. When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average pressure at the middle of the electrode sheet both exceed the second preset pressure value, it means that the weight of the head of the electrode sheet, the weight of the tail and the weight of the middle of the electrode sheet are inconsistent, and the longitudinal surface density of the gap coating is inconsistent at this time. An alarm is required to timely adjust the opening speed of the coating valve and the reflux pressure to make the longitudinal surface density of the gap coating consistent. This solution can monitor the gap coating process in real time, and according to the pressure change of the electrode sheet during the coating process, give warnings and alarms in time to timely adjust the opening speed of the coating valve and the coating reflux pressure, reduce the outflow of poor head and tail weights of the electrode sheet, and improve the coating consistency.

[0098] Among them, the warning message is used to prompt that the coating pressure is deviating from the normal value, and the longitudinal surface density of the gap coating may be inconsistent, and corresponding processing needs to be carried out in time. The alarm message is used to indicate that the coating pressure exceeds the normal value and the longitudinal surface density of the gap coating is inconsistent.

[0099] An embodiment of the present invention provides a method for adjusting the longitudinal surface density of gap coating. By obtaining the coating pressure data during the coating process in real time and generating a corresponding coating pressure curve; according to the coating pressure curve, judging whether the longitudinal surface density of gap coating is consistent; when the judgment is no, adjusting the opening speed of the coating valve and the paint reflux pressure in the coating stop state to make the longitudinal surface density of gap coating consistent. In the present invention, according to the change of coating pressure, the consistency of the longitudinal surface density of gap coating can be quickly judged, and the opening speed of the coating valve and the paint reflux pressure in the coating stop state can be adjusted to ensure coating consistency and avoid the problem of batch scrapping caused by inconsistent coating surface density during the coating process. Moreover, during the machine adjustment process, the next set of data can be debugged directly according to the change trend of the coating pressure, without drying, taking the film at the machine tail, punching and weighing, which can save a lot of time and reduce the debugging scrap rate at the same time.

[0100] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0101] Embodiment 2

[0102] Figure 5 A coating surface density adjustment device is shown. The coating surface density adjustment device corresponds one-to-one with the coating surface density adjustment method in the above embodiment. The coating surface density adjustment device includes a data acquisition unit 21, a judgment unit 22, and an adjustment unit 23. The detailed description of each functional module is as follows:

[0103] The data acquisition unit 21 is used to obtain the coating pressure data during the coating process in real time and generate a corresponding coating pressure curve;

[0104] In the embodiment of the present invention, through a coating pressure sensor preset on the material conveying pipe of the coating machine, the coating pressure data during the coating process is collected by the coating pressure sensor, and a corresponding coating pressure curve is generated.

[0105] See Figure 3 , a coating pressure change curve graph is provided, which is used to display the change curve of the coating pressure. Among them, the abscissa is the coating distance, the ordinate is the coating pressure value, and the maximum value is the maximum pressure value that the coating pressure can reach. When the maximum pressure value is exceeded, an alarm needs to be given.

[0106] Among them, the data acquisition unit 21 is further used for:

[0107] Obtaining in real time the coating pressure data collected by the coating pressure sensor preset on the material conveying pipeline of the coating machine. The coating pressure sensor is arranged between the gap valve and the coating die head;

[0108] Convert the coating pressure data into an analog signal and generate a coating pressure curve;

[0109] Display the coating pressure curve in the corresponding display interface.

[0110] Specifically, the coating pressure data is obtained in real time through a pre-set coating pressure sensor. The coating pressure data is converted into an analog signal by a PLC unit and sent to an industrial control computer. The industrial control computer, through the development software and display interface pre-designed for the pressure data, generates a corresponding pressure curve for the coating pressure data converted into a virtual signal according to a pre-set curve model, and displays it in the display interface provided by the industrial control computer, so that the operator can directly judge the consistency of the longitudinal surface density of the gap coating through the change trend of the pressure curve displayed on the interface, and adjust the longitudinal surface density of the gap coating in time.

[0111] Furthermore, the curve model can be a line graph, a bar graph or a line chart. According to specific requirements, the coating pressure data is used to generate a corresponding pressure curve to intuitively display the change trend of the coating pressure.

[0112] Among them, the coating pressure sensor can be a Kistler pressure sensor GP-M010, with faster acquisition speed and higher accuracy.

[0113] See Figure 4 , in an embodiment, a coating pressure curve graph of the pole piece head is provided. Among them, the abscissa is the coating distance, and the ordinate is the coating pressure value of the pole piece head. The statistical curve A is a pre-set standard pressure change curve, and the current curve B is the coating pressure curve of the pole piece head during the coating process. By comparing the statistical curve A and the current curve B, the corresponding percentage value can be obtained. When the percentage value meets the pre-set value, it indicates that the longitudinal surface density of the gap coating is consistent. When the percentage value exceeds the pre-set value, an alarm is triggered to adjust the longitudinal surface density of the gap coating, which can greatly reduce the outflow of the poor weight of the pole piece head and tail, improve the safety performance of the finished battery, and at the same time improve the consistency of the battery capacity.

[0114] A judging unit 22, configured to judge whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve;

[0115] In the embodiment of the present invention, the change trend of the coating pressure of the pole piece can be determined according to the coating pressure curve, and according to the change trend of the coating pressure, it can be further determined whether the longitudinal surface density of the gap coating is consistent. For example, if the change trend fluctuates greatly, it can be considered that the longitudinal surface density of the gap coating is inconsistent; if the change trend is relatively stable, it can be considered that the longitudinal surface density of the gap coating is consistent.

[0116] In an embodiment of the present invention, the judging unit 22 is further configured to:

[0117] Determine the correlation between the coating pressure and the head weight and tail weight of the electrode sheet;

[0118] Determine the head weight of the electrode sheet according to the coating pressure curve and the correlation;

[0119] Judge whether the head weight of the electrode sheet is consistent with the preset middle weight of the electrode sheet;

[0120] When it is judged that the head weight of the electrode sheet is consistent with the preset middle weight of the electrode sheet, it is determined that the longitudinal surface density of the gap coating is consistent;

[0121] When it is judged that the head weight of the electrode sheet is inconsistent with the preset middle weight of the electrode sheet, it is determined that the longitudinal surface density of the gap coating is inconsistent.

[0122] Specifically, by collecting the coating pressure values under different reflux pressures, the corresponding coating pressure curve is generated to determine the change trend of the coating pressure. By collecting the longitudinal coating weights under different reflux pressures in advance, the corresponding longitudinal coating weight curve is generated. According to the longitudinal coating weight curve, the change trends of the head and tail weights of the longitudinal coating electrode sheet can be determined. Comparing the change trend of the coating pressure with the change trends of the head, middle and tail weights of the longitudinal coating electrode sheet, it can be seen that the change trend of the coating pressure is consistent with the change trends of the head and tail weights of the longitudinal coating electrode sheet, and there is a certain correlation, that is, the greater the coating pressure, the greater the head weight of the electrode sheet. By separately extracting the head, middle and tail weights of the electrode sheet and the coating pressure data for correlation analysis and fitting, the coefficient of determination R 2 > 85%, and this coefficient of determination represents the proportion of the common variance between two variables. It can be obtained that the electrode sheet weight = -5.831 + 0.005490 * pressure - 0.000001 * pressure 2 of the correlation formula, where the electrode sheet weight can be the head weight, tail weight or middle weight of the electrode sheet, and the pressure can be the average coating pressure of each part of the electrode sheet. For example, the average coating pressure of the head of the electrode sheet. According to the obtained pressure values within multiple different coating distances and calculating their average pressure, and according to this average pressure and the above formula, the weights of different electrode sheet positions can be obtained. It can be understood that different coating slurries, the design of the coating product and the coating equipment will all affect the weight of the electrode sheet. For example, for a slurry with a higher viscosity, the weight of the electrode sheet is greater. Therefore, there will be some differences in the correlation formula for the head weight of the electrode sheet obtained.

[0123] Among them, the longitudinal coating weight can be obtained by weighing.

[0124] Further, based on the above-mentioned correlation, the weight of the head of the current electrode sheet can be determined. Further, the weight of the head of the electrode sheet is compared with the preset weight of the middle part of the electrode sheet. This preset weight of the middle part of the electrode sheet is a pre-set standard weight value. By comparing the weight of the head of the current electrode sheet with the preset weight of the middle part of the electrode sheet, it is determined whether the head and the middle part of the electrode sheet are consistent, so as to judge whether the longitudinal surface density of the slot coating is consistent.

[0125] Among them, if the weight of the head of the electrode sheet is greater than the preset weight of the middle part of the electrode sheet, that is, the weight of the head of the electrode sheet is relatively heavier than the preset weight of the middle part of the electrode sheet. At this time, it can be considered that the weight of the head of the electrode sheet is inconsistent with the preset weight of the middle part of the electrode sheet, that is, the longitudinal surface density of the slot coating is inconsistent. If the weight of the head of the electrode sheet is less than the preset weight of the middle part of the electrode sheet, that is, the weight of the head of the electrode sheet is relatively lighter than the preset weight of the middle part of the electrode sheet. At this time, it can be considered that the weight of the head of the electrode sheet is inconsistent with the preset weight of the middle part of the electrode sheet, that is, the longitudinal surface density of the slot coating is inconsistent.

[0126] Further, the weight of the tail of the electrode sheet can also be obtained in the above-mentioned manner, so as to judge whether the weights of the head and the tail of the electrode sheet are consistent with the preset weight of the middle part of the electrode sheet, and to judge whether the longitudinal surface density of the slot coating is consistent.

[0127] In an embodiment of the present invention, the slot coating surface density device further includes a pressure judgment unit for:

[0128] Judging whether the current coating pressure value conforms to the preset coating pressure value according to the coating pressure data;

[0129] When the current coating pressure value conforms to the preset coating pressure value, obtain the paint reflux pressure value in the coating stop state, and judge whether the paint reflux pressure value in the coating stop state conforms to the preset paint reflux pressure value;

[0130] When the paint reflux pressure value in the coating stop state does not conform to the preset paint reflux pressure value, the judgment unit 22 is executed.

[0131] Among them, the paint reflux pressure value in the coating stop state can be obtained by collecting the reflux pressure when the coating machine stops coating operation through a paint reflux pressure sensor pre-set on the material conveying pipe of the coating machine. When the paint reflux pressure value does not conform to the preset paint reflux pressure value, it indicates that there is a risk of inconsistency in the longitudinal surface density of the slot coating. At this time, it is further judged whether the longitudinal surface density of the slot coating is consistent. By judging the opening speed of the coating valve and the paint reflux pressure in the coating stop state, various factors affecting the longitudinal surface density of the slot coating can be monitored, so as to make corresponding adjustments and make the longitudinal surface density of the slot coating consistent.

[0132] Further, among them, the paint reflux pressure sensor can be a Keyence pressure sensor GP-M010, which has a faster acquisition speed and higher accuracy.

[0133] An adjustment unit 23, configured to adjust the opening speed of the coating valve and the coating reflux pressure in the coating stop state when the longitudinal surface density of the gap coating is inconsistent, so as to make the longitudinal surface density of the gap coating consistent.

[0134] In an embodiment of the present invention, the adjustment unit 23 is further configured to reduce the opening degree of the reflux valve to reduce the coating reflux pressure and reduce the opening speed of the coating valve when the weight of the head of the pole piece is greater than the preset weight of the middle of the pole piece. Specifically, when the weight of the head of the pole piece is greater than the preset weight of the middle of the pole piece, the opening degree of the reflux valve and the opening speed of the coating valve can be reduced to reduce the coating reflux pressure, and the opening speed of the coating valve can be reduced to reduce the weight of the head of the pole piece, so that the weight of the head of the pole piece is consistent with the weight of the middle of the pole piece.

[0135] In an embodiment of the present invention, the adjustment unit 23 is further configured to increase the opening degree of the reflux valve to increase the coating reflux pressure and increase the opening speed of the coating valve when the weight of the head of the pole piece is less than the preset weight of the middle of the pole piece. Specifically, when the weight of the head of the pole piece is less than the preset weight of the middle of the pole piece, the opening degree of the reflux valve can be increased to increase the coating reflux pressure, and the opening speed of the coating valve can be increased to increase the weight of the head of the clip piece, so that the weight of the head of the pole piece is consistent with the weight of the middle of the pole piece.

[0136] In an embodiment of the present invention, the gap coating longitudinal surface density adjustment device further includes an alarm unit, configured to:

[0137] Extract the pressure at the head of the pole piece and the pressure at the tail of the pole piece according to the coating pressure curve;

[0138] Compare the pressure at the head of the pole piece and the pressure at the tail of the pole piece with the average value of the pressure at the middle of the pole piece respectively;

[0139] When the ratios of the pressure at the head of the pole piece and the pressure at the tail of the pole piece to the average value of the pressure at the middle of the pole piece both exceed the first preset pressure value, output a warning message;

[0140] When the ratios of the pressure at the head of the pole piece and the pressure at the tail of the pole piece to the average value of the pressure at the middle of the pole piece both exceed the second preset pressure value, output an alarm message;

[0141] Wherein, the first preset pressure value is less than the second preset pressure value.

[0142] Specifically, according to the coating pressure curve, the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet under this pressure curve can be directly extracted, and the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet are respectively compared with the average pressure in the middle of the electrode sheet. When the ratios to the average pressure in the middle of the electrode sheet both exceed the first preset pressure value, a warning message is output. That is, at this time, there is a risk that the weights of the head and tail of the electrode sheet are inconsistent with the weight in the middle of the electrode sheet, and a warning is required to timely adjust the coating pressure and the reflux pressure. When the ratios of the pressure at the head of the electrode sheet and the pressure at the tail of the electrode sheet to the average pressure in the middle of the electrode sheet both exceed the second preset pressure value, it indicates that the weights of the head and tail of the electrode sheet are inconsistent with the weight in the middle of the electrode sheet, and the longitudinal surface density of the gap coating is inconsistent. At this time, an alarm needs to be given to timely adjust the coating pressure and the reflux pressure to keep the longitudinal surface density of the gap coating consistent. This solution can monitor the coating process in real time, and according to the pressure change of the electrode sheet during the coating process, give warnings and alarms in time to timely adjust the opening speed of the coating valve and the coating reflux pressure, reducing the outflow of poor head and tail weights of the electrode sheet and improving the coating consistency.

[0143] Among them, the warning message is used to prompt that the coating pressure is deviating from the normal value, and there may be a situation where the longitudinal surface density of the gap coating is inconsistent, and corresponding processing needs to be carried out in time. The alarm message is used to indicate that the coating pressure exceeds the normal value and the longitudinal surface density of the gap coating is inconsistent.

[0144] The embodiment of the present invention provides a device for adjusting the longitudinal surface density of gap coating, which obtains the coating pressure data during the coating process in real time and generates a corresponding coating pressure curve; judges whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve; when the judgment is no, the coating reflux pressure in the coating stop state.

[0145] In the present invention, according to the change of the coating pressure in real time, the consistency of the longitudinal surface density of the gap coating can be quickly judged, and the opening speed of the coating valve and the coating reflux pressure in the coating stop state can be adjusted to ensure the coating consistency and avoid the problem of batch scrapping caused by inconsistent coating surface density during the coating process. Moreover, during the machine adjustment process, the next set of data can be debugged directly according to the change trend of the coating pressure, without drying, taking the sheet at the machine tail, punching and weighing, which can save a lot of time and reduce the debugging scrap rate at the same time.

[0146] Each module in the above device for adjusting the longitudinal surface density of gap coating can be implemented in whole or in part by software, hardware and their combination. The above modules can be embedded in the processor of the computer device in the form of hardware or independent of it, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0147] Embodiment Three

[0148] Figure 6 The structure schematic diagram of a coating system provided in the third example of the present invention is shown. The coating system includes a coater, a control unit 7, and an industrial control computer 9. The detailed description of each functional module is as follows:

[0149] Among them, the coater includes a coating die head 1, a ball valve 4, a feeding pipeline 5, a slurry buffer tank 6, a screw feeding pump 10, a filter element 11, a gap valve 12, a reflux valve 131, and a coating valve 132.

[0150] The coater is provided with a coating pressure sensor 2 on the feeding pipeline 5 of the coater. The coating pressure sensor 2 is arranged between the coating die head 1 and the gap valve, and is used to collect the coating pressure data during the coating process respectively;

[0151] The control unit 7 is used to convert the coating pressure data into an analog signal 8 and output it to the industrial control computer 9.

[0152] The industrial control computer 9 is used to obtain the coating pressure data converted into an analog signal and execute the steps of the above-mentioned longitudinal surface density adjustment method for gap coating.

[0153] Among them, a coating reflux pressure sensor 3 is also arranged on the feeding pipeline 5 of the coater. The coating reflux pressure sensor 3 is arranged between the reflux valve 131 and the slurry buffer tank 6, and can be used to collect the coating reflux pressure data in the coating stop state, so as to adjust the coating reflux pressure data during the coating debugging process to make it meet the coating requirements and ensure the coating consistency.

[0154] In the embodiment of the present invention, the gap valve includes a coating valve 132 and a reflux valve 131. The reflux valve 131 is used to adjust the coating reflux pressure by adjusting the opening degree of the reflux valve 131 in the coating stop state when the longitudinal surface density of the gap coating is inconsistent, so as to make the longitudinal surface density of the gap coating consistent. The coating valve 132 is used to make the longitudinal surface density of the gap coating consistent by adjusting the opening speed of the coating valve 132 when the longitudinal surface density of the gap coating is inconsistent.

[0155] Specifically, when the weight of the head of the pole piece is greater than the preset weight of the middle of the pole piece, the opening degree of the reflux valve 131 is reduced to reduce the coating reflux pressure and lower the opening speed of the coating valve 132;

[0156] When the weight of the head of the pole piece is less than the preset weight of the middle of the pole piece, the opening degree of the reflux valve 131 is increased to increase the coating reflux pressure and increase the opening speed of the coating valve 132.

[0157] In an embodiment of the present invention, the control unit 7 is a PLC unit. The PLC unit converts the coating pressure data and the coating reflux pressure data into analog signals and sends them to an industrial control computer. The industrial control computer, through the development software and display interface pre-designed for the pressure data, converts the coating pressure data and the coating reflux pressure data converted into virtual signals into corresponding pressure curves respectively, and displays them on the display interface provided by the industrial control computer, so that the operator can directly judge the consistency of the longitudinal surface density of the gap coating through the change trend of the pressure curve displayed on the interface, and adjust the longitudinal surface density of the gap coating in a timely manner.

[0158] In an embodiment of the present invention, a high-precision coating pressure sensor 2 and a coating reflux pressure sensor 3 are adopted, and special software is developed for the pressure output data, which can output a pressure value every 1 ms. The corresponding running speed of the gap coating is 20 m / min, that is, a pressure value can be output for every 0.33 mm of the electrode sheet. The pressure data is collected more accurately, and the generated pressure curve is more intuitive.

[0159] In an embodiment of the present invention, a coating system is provided. A coating pressure sensor is arranged on the material conveying pipeline of the coater to collect the coating pressure data during the coating process; a control unit is used to convert the coating pressure data into an analog signal and output it to an industrial control computer. The control unit converts the collected pressure data, and the industrial control computer converts the pressure data into a pressure curve, so as to judge the consistency of the longitudinal surface density of the gap coating according to the pressure curve, avoid the bad output at the head and tail of the electrode sheet, and the change trend of the pressure curve can be intuitively viewed through the display interface provided by the industrial control computer, quickly judge the consistency of the longitudinal surface density of the gap coating, and adjust the coating pressure during the coating process and the reflux pressure in the coating stop state in a timely manner.

[0160] In one embodiment, a controller is provided. The internal structure diagram of the controller can be as Figure 8 shown. The controller includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a readable storage medium. The readable storage medium stores computer-readable instructions. The network interface of the controller is used to communicate with an external terminal through a network connection. When the computer-readable instructions are executed by the processor, a method for adjusting the longitudinal surface density of the gap coating is realized. The readable storage medium provided in this embodiment includes a non-volatile readable storage medium and a volatile readable storage medium.

[0161] A controller includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor. When the processor executes the computer-readable instructions, the steps of the above-mentioned gap coating longitudinal surface density adjustment method are implemented.

[0162] One or more readable storage media store computer-readable instructions. When the computer-readable instructions are executed by a processor, the steps of the above-mentioned gap coating longitudinal surface density adjustment method are implemented.

[0163] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through computer-readable instructions. The computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When the computer-readable instructions are executed, they can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0164] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0165] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for adjusting the longitudinal surface density of gap coating, characterized in that, Including: Real-time obtain the coating pressure data during the coating process and generate a corresponding coating pressure curve; Judge whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve; When it is determined that the longitudinal surface density of the gap coating is inconsistent, adjust the opening speed of the coating valve and the paint reflux pressure in the coating stop state so that the longitudinal surface density of the gap coating is consistent; Among them, the judging whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve includes: Determine the correlation between the coating pressure and the weight of the head of the electrode; Determine the weight of the head of the electrode according to the coating pressure curve and the correlation; Judge whether the weight of the head of the electrode is consistent with the preset weight of the middle part of the electrode; When it is judged that the weight of the head of the electrode is consistent with the preset weight of the middle part of the electrode, it is determined that the longitudinal surface density of the gap coating is consistent; When it is judged that the weight of the head of the electrode is inconsistent with the preset weight of the middle part of the electrode, it is determined that the longitudinal surface density of the gap coating is inconsistent.

2. The method for adjusting the longitudinal surface density of gap coating according to claim 1, wherein The adjusting the opening speed of the coating valve and the paint reflux pressure in the coating stop state includes: When the weight of the head of the electrode is greater than the preset weight of the middle part of the electrode, reduce the opening of the reflux valve to reduce the paint reflux pressure and lower the opening speed of the coating valve; When the weight of the head of the electrode is less than the preset weight of the middle part of the electrode, increase the opening of the reflux valve to increase the paint reflux pressure and increase the opening speed of the coating valve.

3. The method for adjusting the longitudinal surface density of gap coating according to claim 1, wherein Before judging whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve, it also includes: Judge whether the current coating pressure value conforms to the preset coating pressure value according to the coating pressure data; When the current coating pressure value conforms to the preset coating pressure value, obtain the paint reflux pressure value in the coating stop state and judge whether the paint reflux pressure value in the coating stop state conforms to the preset paint reflux pressure value; When the paint reflux pressure value in the coating stop state does not conform to the preset paint reflux pressure value, judge whether the longitudinal surface density of the gap coating is consistent according to the coating pressure curve.

4. The method for adjusting the longitudinal surface density of gap coating according to claim 1, characterized in that, The method also includes: Extract the head pressure and tail pressure of the electrode according to the coating pressure curve; Compare the head pressure and tail pressure of the electrode with the average value of the middle pressure of the electrode respectively; When the ratios of the head pressure and tail pressure of the electrode to the average value of the middle pressure of the electrode both exceed the first preset pressure value, output a warning message; When the ratios of the head pressure and tail pressure of the electrode to the average value of the middle pressure of the electrode both exceed the second preset pressure value, output an alarm message; Among them, the first preset pressure value is less than the second preset pressure value.

5. The method for adjusting the longitudinal surface density of gap coating according to claim 1, characterized in that, The real-time obtaining the coating pressure data during the coating process and generating a corresponding coating pressure curve includes: Real-time obtain the coating pressure data collected by a coating pressure sensor preset on the material conveying pipeline of the coater, and the coating pressure sensor is arranged between the gap valve and the coating die head; Convert the coating pressure data into an analog signal and generate the coating pressure curve; Display the coating pressure curve in the corresponding display interface.

6. A coating system, characterized in that, Including: A coater, on the material feeding pipeline of the coater, a coating pressure sensor is provided, and the coating pressure sensor is arranged between the gap valve and the coating die head for collecting coating pressure data; A control unit for converting the coating pressure data into an analog signal and sending it to an industrial control computer; The industrial control computer is used to obtain the coating pressure data converted into an analog signal and execute the steps of the longitudinal surface density adjustment method for gap coating according to any one of claims 1 to 5.

7. The coating system according to claim 6, characterized in that, The gap valve includes: A reflux valve and a coating valve; The reflux valve is used to adjust the coating reflux pressure by adjusting the opening degree of the reflux valve in the coating stop state when the longitudinal surface density of the gap coating is inconsistent, so as to make the longitudinal surface density of the gap coating consistent; The coating valve is used to make the longitudinal surface density of the gap coating consistent by adjusting the opening speed of the coating valve when the longitudinal surface density of the gap coating is inconsistent.

8. A controller, comprising a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, characterized in that, When the processor executes the computer-readable instructions, the steps of the longitudinal surface density adjustment method for gap coating according to any one of claims 1 to 5 are realized.

9. One or more readable storage media storing computer-readable instructions, characterized in that, When the computer-readable instructions are executed by the processor, the steps of the longitudinal surface density adjustment method for gap coating according to any one of claims 1 to 5 are realized.

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