Coating machine, control method of coating machine, control device of coating machine, storage medium

Abstract

The application discloses a coating machine and a control method thereof, a control device of the coating machine and a storage medium. The control method of the coating machine comprises the following steps: acquiring a first flow rate of coating material delivered by the coating machine to one side of a polar plate and a second flow rate of coating material delivered by the coating machine to the other side of the polar plate in real time; calculating an absolute value of a difference between the first flow rate and the second flow rate; acquiring a target flow rate difference interval; comparing the absolute value of the difference between the first flow rate and the second flow rate with the target flow rate difference interval, and controlling the first flow rate and the second flow rate based on a comparison result. According to the application, the absolute value of the difference between the first flow rate and the second flow rate of the two sides of the polar plate is controlled in the target flow rate difference interval, and the uniformity of the coating film thickness of the two sides of the polar plate can be improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a coating machine and its control method, a control device for the coating machine, and a storage medium. Background Technology

[0002] Lithium-ion batteries, as a new type of rechargeable battery, have advantages such as high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness. They have broad application prospects in portable electrical appliances, power tools, large-scale energy storage, and electric vehicle power supplies. In the production process of polymer lithium-ion cells, fast charging and high energy density are key research directions. Fast charging has relatively mature production processes, and in the fabrication of electrode sheets for new cell processes, a double-layer coating process is used.

[0003] During the electrode coating process of batteries, there is a problem that it is difficult to ensure the uniformity of the coating thickness on both sides of the electrode, which can lead to batch lithium plating in the battery. Summary of the Invention

[0004] In view of the above problems, this application provides a coating machine and its control method, a control device for the coating machine, and a storage medium. This application controls the first flow rate and the second flow rate of the coating machine to deliver the coating to both sides of the electrode by a target flow rate difference range, which can improve the uniformity of the coating thickness on both sides of the electrode.

[0005] In a first aspect, this application provides a control method for a coating machine, comprising:

[0006] The first flow rate of the coating machine delivering coating to one side of the electrode sheet and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet are obtained in real time.

[0007] Calculate the absolute value of the difference between the first flow velocity and the second flow velocity;

[0008] Obtain the target flow velocity difference range;

[0009] The absolute value of the difference between the first flow velocity and the second flow velocity is compared with the target flow velocity difference range, and the first flow velocity and the second flow velocity are controlled based on the comparison result.

[0010] The amount of coating material delivered by the coating machine to both sides of the electrode depends on the first flow rate and the second flow rate of the coating material delivered to both sides of the electrode. The higher the consistency between the first flow rate and the second flow rate, the higher the uniformity of the coating thickness on both sides of the electrode. By setting a target flow rate difference range, comparing the absolute value of the difference between the first flow rate and the second flow rate with the target flow rate difference range, and controlling the first flow rate and the second flow rate based on the comparison results, the uniformity of the coating thickness on both sides of the electrode can be improved.

[0011] In some embodiments, comparing the absolute value of the difference between the first flow velocity and the second flow velocity with a target flow velocity difference range, and controlling the first flow velocity and the second flow velocity based on the comparison result, includes:

[0012] If the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, adjust the first flow velocity and the second flow velocity so that the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

[0013] When the absolute value of the difference between the first flow rate and the second flow rate is not within the target flow rate difference range, it indicates that the coating machine is delivering more coating material to one side of the electrode and less to the other side. This will result in a thicker coating on one side of the electrode and a thinner coating on the other side. Therefore, it is necessary to adjust the first flow rate and the second flow rate so that the absolute value of the difference between the first flow rate and the second flow rate is controlled within the target flow rate difference range to improve the uniformity of the thickness on both sides of the electrode.

[0014] In some embodiments, the control method for the coating machine further includes:

[0015] Obtain the first target flow velocity range;

[0016] Based on the fact that the first flow velocity is within the first target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the first flow velocity is kept constant.

[0017] If the first flow velocity is not within the first target flow velocity range, adjust the first flow velocity to the first target flow velocity range.

[0018] Controlling the absolute value of the difference between the first and second flow rates within the target flow rate difference range can improve the uniformity of the coating thickness at the same location on both sides of the electrode. Conversely, controlling the first flow rate within the first target flow rate range can improve the uniformity of the coating thickness on one side of the electrode. Furthermore, setting the first target flow rate range can prevent the first flow rate from being adjusted too high or too low when the absolute value of the difference between the first and second flow rates is not within the target flow rate difference range.

[0019] In some embodiments, the control method for the coating machine further includes:

[0020] An abnormality warning signal is issued if the first flow velocity is not within the first target flow velocity range.

[0021] If the first flow rate is not within the first target flow rate range, it indicates that there is an abnormality in the coating machine's delivery of coating to one side of the electrode. That is, there may be too much or too little coating delivered by the coating machine to one side of the electrode. In this case, an abnormality warning signal needs to be issued so that the first flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness caused by subsequent coating.

[0022] In some embodiments, the control method for the coating machine further includes:

[0023] Obtain the second target flow velocity range;

[0024] Since the second flow velocity is within the second target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the second flow velocity is kept constant.

[0025] If the second flow velocity is not within the second target flow velocity range, adjust the second flow velocity to the second target flow velocity range.

[0026] By controlling the absolute value of the difference between the first and second flow rates within the target flow rate difference range, the uniformity of coating thickness at the same location on both sides of the electrode can be improved. Controlling the first flow rate within the first target flow rate range improves the uniformity of coating thickness on one side of the electrode, while controlling the second flow rate within the second target flow rate range improves the uniformity of thickness on the other side of the electrode. This ensures that both the uniformity of thickness on one and both sides of the electrode are improved. Simultaneously, setting the second target flow rate range prevents the second flow rate from becoming too high or too low during adjustment when the absolute value of the difference between the first and second flow rates is not within the target flow rate difference range.

[0027] In some embodiments, an abnormality warning signal is issued if the second flow rate is not within the second target flow rate range.

[0028] If the second flow rate is not within the second target flow rate range, it indicates that there is an abnormality in the coating machine's delivery of coating to the other side of the electrode. That is, there may be an uneven amount of coating delivered by the coating machine to the other side of the electrode. At this time, an abnormality warning signal needs to be issued so that the second flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness in subsequent coating processes.

[0029] In some embodiments, the control method for the coating machine further includes:

[0030] An abnormality warning signal is issued if the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range.

[0031] If the absolute value of the difference between the first flow rate and the second flow rate is not within the target flow rate difference range, it indicates that there is an abnormality in the coating machine's delivery of coating to both sides of the electrode sheet. That is, there may be an uneven amount of coating delivered by the coating machine to both sides of the electrode sheet. At this time, an abnormality warning message needs to be issued so that the values ​​of the first flow rate and the second flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness on both sides of the electrode sheet in subsequent coating processes.

[0032] Secondly, this application provides a control device for a coating machine, including...

[0033] The acquisition module is configured to acquire the target flow rate difference range, and to acquire in real time the first flow rate of the coating machine delivering coating to one side of the electrode sheet, and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet;

[0034] The control module is connected to the acquisition module. The control module is used to calculate the absolute value of the difference between the first flow velocity and the second flow velocity. The control module is also used to compare the absolute value of the difference between the first flow velocity and the second flow velocity with the target flow velocity difference range, and control the first flow velocity and the second flow velocity based on the comparison result.

[0035] The acquisition module acquires the target flow rate difference range, the first flow rate, and the second flow rate of the coating machine delivering the coating to the electrode. The control module calculates the absolute value of the difference between the first flow rate and the second flow rate based on the first flow rate and the second flow rate acquired by the acquisition module, compares the absolute value of the difference between the first flow rate and the second flow rate with the target flow rate difference range, and controls the first flow rate and the second flow rate based on the comparison result. This ensures that the amount of coating delivered by the coating machine to the surface of the electrode is uniform, thereby ensuring that the coating thickness on the surface of the electrode is uniform.

[0036] Thirdly, this application provides a storage medium, which is a computer-readable storage medium storing a program that, when run, executes the control method of the coating machine of the first aspect.

[0037] Since the storage medium includes the control method of the coating machine in the first aspect, the effect is the same as described above, and will not be repeated here.

[0038] Fourthly, this application provides a coating machine, including the control device for the coating machine of the second aspect.

[0039] Since the coating machine operates using the control method described in the first aspect, the effect is the same as described above, and will not be repeated here.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0042] Figure 1This is a partial structural schematic diagram of a coating machine according to some embodiments of this application;

[0043] Figure 2 This is a flowchart of a control method for a coating machine according to some embodiments of this application;

[0044] Figure 3 This is a flowchart of a control method for a coating machine according to some embodiments of this application;

[0045] Figure 4 This is a flowchart of a control method for a coating machine according to some embodiments of this application;

[0046] Figure 5 This is a flowchart of a control method for a coating machine according to some embodiments of this application;

[0047] Figure 6 This is a flowchart of a control method for a coating machine according to some embodiments of this application;

[0048] Figure 7 This is a flowchart illustrating a control method for a coating machine according to some embodiments of this application.

[0049] The reference numerals in the detailed embodiments are as follows:

[0050] Extrusion head 10, drive roller 20, drying zone S, electrode 30. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] The coating thickness on the electrode surface of a lithium-ion battery has a significant impact on its performance. A thinner coating results in less resistance for lithium ions, better ion conductivity, and lower impedance. However, an excessively thin coating reduces liquid retention and electronic insulation, negatively affecting battery performance. A thicker coating allows for fewer winding layers, leading to a decrease in capacity. Coating thickness also affects other performance characteristics of lithium-ion batteries. Therefore, the coating thickness on the electrode surface significantly impacts battery performance during manufacturing. In the coating process, inconsistent coating thickness on both sides of the electrode can occur.

[0060] To solve the above problems, the inventors noticed that the first and second flow rates of the coating machine delivering coating to both sides of the electrode can be controlled. By controlling the first and second flow rates according to the target flow rate difference range, the amount of coating delivered by the coating machine to both sides of the electrode can be adjusted to improve the uniformity of the coating thickness on both sides of the electrode, thereby avoiding the problem of batch lithium plating in the battery.

[0061] The control method for a coating machine provided in this application can be applied to coating machines with coating functions, and can be used in coating machines for electrode sheets of lithium batteries, but is not limited to those for coating.

[0062] Please refer to Figure 1 The coating machine of this application embodiment includes an extrusion head 10, a drying device, a first conveying pump, a second conveying pump, and two drive rollers 20. The two drive rollers 20 are spaced apart, and their axes are parallel to each other. A heating device is provided between the two drive rollers 20. An extrusion head 10 is provided on one side of each drive roller 20. The electrode 30 can pass over one drive roller 20 in the forward direction and over the other drive roller 20 in the reverse direction. Each extrusion head 10 is located on one radial side of each drive roller 20. The first conveying pump is connected to one extrusion head 10 through a pipeline, and the second conveying pump is connected to the other extrusion head 10 through a pipeline. The first and second conveying pumps convey coating material to the two extrusion heads 10 through pipelines. The coating material is coated on both sides of the electrode 30 through the two extrusion heads 10. When the electrode 30 is conveyed between the two drive rollers 20, the drying device between the two drive rollers 20 dries the coating material. Figure 1 The S-region is the heating zone of the drying device. The first and second flow rates of the coating delivered by the two extrusion heads 10 are controlled by the target flow rate difference range to adjust the amount of coating delivered by the extrusion heads 10 to the surface of the electrode 30, thereby improving the uniformity of the coating thickness on both sides of the electrode.

[0063] For ease of explanation, the following embodiments use a control method for a coating machine according to an embodiment of this application as an example.

[0064] Please refer to Figure 2The control method for the coating machine in this application embodiment includes:

[0065] The first flow rate of the coating machine delivering coating to one side of the electrode sheet and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet are obtained in real time.

[0066] Calculate the absolute value of the difference between the first flow velocity and the second flow velocity;

[0067] Obtain the target flow velocity difference range;

[0068] The absolute value of the difference between the first flow velocity and the second flow velocity is compared with the target flow velocity difference range, and the first flow velocity and the second flow velocity are controlled based on the comparison result.

[0069] Specifically, one option is to obtain the flow rates of the first and second conveying pumps of the coating machine, with the flow rate of the first pump serving as the first flow rate and the flow rate of the second pump serving as the second flow rate; alternatively, the flow rate of the first pump can serve as the second flow rate and the flow rate of the second pump can serve as the first flow rate. Alternatively, one can obtain the flow rates of the inlets of the two extrusion heads, with the flow rate of one extrusion head's inlet serving as the first flow rate and the flow rate of the other extrusion head's inlet serving as the second flow rate. Another option is to obtain the flow rates of the fluids within the pipelines containing the two extrusion heads, respectively, and use them as the first and second flow rates.

[0070] The target flow rate difference range can be preset or manually input according to actual production needs.

[0071] The first and second flow velocities are controlled based on the target velocity difference range. Various methods can be used to adjust the first and second flow velocities.

[0072] For example, if the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, the difference between the first flow velocity and the second flow velocity is first compared with the upper and lower limits of the target difference range. If the difference between the first flow velocity and the second flow velocity is greater than the upper limit of the target difference range, the second flow velocity can be kept constant while the first flow velocity is decreased; the first flow velocity can also be kept constant while the second flow velocity is increased; or both the first and second flow velocities can be adjusted simultaneously, i.e., decreasing the first flow velocity and increasing the second flow velocity, or both the first and second flow velocities can be increased simultaneously, with the increase in the first flow velocity being less than the increase in the second flow velocity. If the difference between the first flow velocity and the second flow velocity is less than the lower limit of the target difference range, the second flow velocity can be kept constant while the first flow velocity is increased; the first flow velocity can also be kept constant while the second flow velocity is decreased; or both the first and second flow velocities can be adjusted simultaneously, i.e., increasing the first flow velocity and decreasing the second flow velocity, or both the first and second flow velocities can be increased simultaneously, with the increase in the first flow velocity being greater than the increase in the second flow velocity.

[0073] For example, the absolute value of the difference between the first flow rate and the second flow rate can be controlled within the target flow rate difference range to improve the uniformity of the coating thickness on both sides of the electrode.

[0074] The amount of coating delivered by the coating machine to both sides of the electrode depends on the first and second flow rates of the coating delivered to both sides. Higher consistency between the first and second flow rates results in greater uniformity of coating thickness on both sides of the electrode. By setting a target flow rate difference range and controlling the absolute value of the difference between the first and second flow rates within this range, the uniformity of the coating thickness on both sides of the electrode can be improved. Compared to adjusting the flow rate of the coating machine to both sides of the electrode, which is less precise due to the viscosity of the battery coating, controlling the flow rate can improve the accuracy of the output from the coating machine. Controlling the first and second flow rates, however, can significantly improve the accuracy of the output.

[0075] In some embodiments, please refer to Figure 3 The absolute value of the difference between the first flow velocity and the second flow velocity is compared with the target flow velocity difference range, and the first and second flow velocities are controlled based on the comparison result, including:

[0076] If the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, adjust the first flow velocity and the second flow velocity so that the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

[0077] For example, if the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, the value of the first flow velocity can be kept unchanged, and the second flow velocity can be adjusted until the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range. Alternatively, the value of the first flow velocity can be kept unchanged, and the second flow velocity can be adjusted so that the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range. Or, the first flow velocity and the second flow velocity can be adjusted simultaneously so that the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

[0078] When the absolute value of the difference between the first and second flow rates is not within the target flow rate difference range, it indicates that the coating machine is delivering more coating material to one side of the electrode and less to the other. This results in a thicker coating on one side of the electrode and a thinner coating on the other. Therefore, it is necessary to adjust the first and second flow rates so that the absolute value of their difference is controlled within the target flow rate difference range to improve the uniformity of the thickness on both sides of the electrode. Simultaneously, setting a first target flow rate range can also prevent the first flow rate from being adjusted too high or too low when the absolute value of the difference between the first and second flow rates is not within the target flow rate difference range.

[0079] In some embodiments, please continue to refer to Figure 3The control methods for coating machines also include:

[0080] Obtain the first target flow velocity range;

[0081] Based on the fact that the first flow velocity is within the first target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the first flow velocity is kept constant.

[0082] If the first flow velocity is not within the first target flow velocity range, adjust the first flow velocity to the first target flow velocity range.

[0083] If the first flow velocity is not within the first target flow velocity range, the first flow velocity can be adjusted manually or automatically to the first target flow velocity range, without specific limitations.

[0084] For example, when the first flow velocity is not within the first target flow velocity range, and the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range, the first flow velocity can be adjusted to the first target flow velocity range first, and then it can be determined whether the absolute value of the difference between the first and second flow velocities is within the target flow velocity difference range. When the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range, the first flow velocity can be kept unchanged, while the second flow velocity is adjusted until the absolute value of the difference between the first and second flow velocities is within the target flow velocity difference range; alternatively, the second flow velocity can be kept unchanged, while the first flow velocity is adjusted within the first target flow velocity range. The adjusted first flow velocity must be greater than or equal to the lower limit of the first target flow velocity range and less than or equal to the upper limit of the first target flow velocity range. When adjusting the first flow velocity within the first target flow velocity range still results in the absolute value of the difference between the first and second flow velocities not being within the target flow velocity difference range, the value of the second flow velocity can be adjusted until the absolute value of the difference between the first and second flow velocities is within the target flow velocity difference range. Adjusting the first and second flow rates in this way avoids the difficulty of achieving the desired adjustment by repeatedly adjusting the first and second flow rates.

[0085] Controlling the absolute value of the difference between the first flow rate and the second flow rate within the target flow rate difference range can improve the uniformity of the coating thickness at the same location on both sides of the electrode, while controlling the first flow rate within the first target flow rate range can improve the uniformity of the coating thickness on one side of the electrode.

[0086] In some embodiments, please refer to Figure 4 The control methods for coating machines also include:

[0087] An abnormality warning signal is issued if the first flow velocity is not within the first target flow velocity range.

[0088] For example, an abnormality alert signal can be sent to a display device, such as a monitor, causing the display device to display abnormal information in the form of text or images.

[0089] If the first flow rate is not within the first target flow rate range, it indicates that there is an abnormality in the coating machine's delivery of coating to one side of the electrode. That is, there may be too much or too little coating delivered by the coating machine to one side of the electrode. In this case, an abnormality warning signal needs to be issued so that the first flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness caused by subsequent coating.

[0090] In some embodiments, please refer to Figure 5 The control methods for coating machines also include:

[0091] Obtain the second target flow velocity range;

[0092] Since the second flow velocity is within the second target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the second flow velocity is kept constant.

[0093] If the second flow velocity is not within the second target flow velocity range, adjust the second flow velocity to the second target flow velocity range.

[0094] For example, when the second flow velocity is not within the second target flow velocity range, and the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range, the second flow velocity can be adjusted to the second target flow velocity range first, and the first flow velocity can be adjusted to the first target flow velocity range (since the first flow velocity is within the first target flow velocity range, it is initially kept constant). At this point, when determining whether the absolute value of the difference between the first and second flow velocities is within the target flow velocity difference range, if the absolute value of the difference is not within the target flow velocity difference range, either the first or second flow velocity can be adjusted, or both can be adjusted simultaneously. The adjustment range of the first flow velocity is limited to the first target flow velocity range, and the adjustment range of the second flow velocity is limited to the second target flow velocity range, until the absolute value of the difference between the first and second flow velocities is within the target flow velocity difference range, at which point the first and second flow velocities are kept constant. Adjusting the first and second flow velocities in this way avoids the difficulty of repeatedly adjusting the first and second flow velocities to achieve the desired adjustment.

[0095] By controlling the absolute value of the difference between the first and second flow rates within the target flow rate difference range, the uniformity of coating thickness at the same location on both sides of the electrode can be improved. Controlling the first flow rate within the first target flow rate range improves the uniformity of coating thickness on one side of the electrode, while controlling the second flow rate within the second target flow rate range improves the uniformity of thickness on the other side of the electrode. This ensures that both the uniformity of thickness on one and both sides of the electrode are improved. Simultaneously, setting the second target flow rate range prevents the second flow rate from becoming too high or too low during adjustment when the absolute value of the difference between the first and second flow rates is not within the target flow rate difference range.

[0096] In some embodiments, please refer to Figure 6 The control methods for coating machines also include:

[0097] An abnormality warning signal is issued if the second flow velocity is not within the second target flow velocity range.

[0098] For example, an abnormality alert signal can be sent to a display device, such as a monitor, causing the display device to display abnormal information in the form of text or images.

[0099] If the second flow rate is not within the second target flow rate range, it indicates that there is an abnormality in the coating machine's delivery of coating to the other side of the electrode. That is, there may be an uneven amount of coating delivered by the coating machine to the other side of the electrode. At this time, an abnormality warning signal needs to be issued so that the second flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness in subsequent coating processes.

[0100] In some embodiments, the control method for the coating machine further includes:

[0101] An abnormality warning signal is issued if the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range.

[0102] For example, an abnormality alert signal can be sent to a display device, such as a monitor, causing the display device to display abnormal information in the form of text or images.

[0103] If the absolute value of the difference between the first flow rate and the second flow rate is not within the target flow rate difference range, it indicates that there is an abnormality in the coating machine's delivery of coating to both sides of the electrode sheet. That is, there may be an uneven amount of coating delivered by the coating machine to both sides of the electrode sheet. At this time, an abnormality warning message needs to be issued so that the values ​​of the first flow rate and the second flow rate can be adjusted in time to avoid the problem of inconsistent coating thickness on both sides of the electrode sheet in subsequent coating processes.

[0104] In some embodiments, please refer to Figure 7The first flow rate can be adjusted first. The adjustment process of the first flow rate is as follows: obtain the first target flow rate range, obtain the first flow rate in real time, and determine whether the first flow rate is within the first target flow rate range. If the first flow rate is not within the first target flow rate range, adjust the first flow rate to the first target flow rate range.

[0105] The adjustment process for the second flow velocity is as follows: obtain the second target flow velocity range, obtain the second flow velocity in real time, and adjust the second flow velocity to the second target flow velocity range if the second flow velocity is not within the second target flow velocity range.

[0106] If the first flow velocity is within the first target flow velocity range and the second flow velocity is within the second target flow velocity range, then determine whether the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range. If the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, maintain the first flow velocity and the second flow velocity unchanged; if the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, adjust the first flow velocity and / or the second flow velocity until the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

[0107] Figure 7 The flowchart of the control method involves first adjusting the first flow velocity and determining whether it falls within the first target flow velocity range; alternatively, the second flow velocity can be adjusted first, and its condition determined whether it falls within the second target flow velocity range, before adjusting the first flow velocity and determining whether it falls within the first target flow velocity range. In other embodiments, the first and second flow velocities can be acquired and determined simultaneously, without specific limitations here.

[0108] For ease of explanation, the following embodiments use a control device for a coating machine according to an embodiment of this application as an example.

[0109] An embodiment of this application provides a control device for a coating machine, including a data acquisition module and a control module. The data acquisition module is configured to acquire a target flow rate difference range and to acquire in real time a first flow rate at which the coating machine delivers coating material to one side of the electrode and a second flow rate at which the coating machine delivers coating material to the other side of the electrode. The control module is communicatively connected to the data acquisition module. The control module is used to calculate the absolute value of the difference between the first and second flow rates, and to compare the absolute value of the difference between the first and second flow rates with the target flow rate difference range, and to control the first and second flow rates based on the comparison result.

[0110] Optionally, the acquisition module may include a flow rate sensor measuring element located upstream of the extrusion head of the coating machine, with the measuring element installed on a pipeline connected to the extrusion head.

[0111] Optionally, the control module can be a controller, such as a PLC controller or a microcontroller, etc., without specific limitations.

[0112] Specifically, the control module can control the coating thickness on the electrode surface based on the parameters collected by the acquisition module, and the control method of the coating machine described in the above embodiment can be used for this process.

[0113] The acquisition module collects the first flow rate, the second flow rate, and the target flow rate difference range of the coating machine delivering the coating to the electrode. The control module controls the first and second flow rates of the coating machine delivering the coating to both sides of the electrode based on the target flow rate difference range. This can improve the uniformity of the amount of coating delivered by the coating machine to the surface of the electrode and avoid the problem of batch lithium plating in the battery caused by inconsistent thickness on both sides of the electrode.

[0114] For ease of explanation, the following embodiments use a storage medium according to an embodiment of this application as an example.

[0115] The storage medium in this application embodiment is a computer-readable storage medium that stores a program. When the program is run, it executes the control method of the coating machine described in the above embodiment.

[0116] Computer-readable storage media may include electronic circuits, semiconductor memory devices, read-only memory (ROM), flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc., and are not limited thereto.

[0117] Since the storage medium includes the control method of the coating machine in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0118] For ease of explanation, the following embodiments use a coating machine according to an embodiment of this application as an example.

[0119] The coating machine of this application includes the control device of the coating machine of the above embodiment; or includes the storage medium of the above embodiment.

[0120] For ease of explanation, please refer to the following embodiments. Figures 1-6 The following description will be based on an embodiment of a coating machine control method.

[0121] The first flow rate of the coating machine delivering coating to one side of the electrode sheet and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet are obtained in real time.

[0122] Calculate the absolute value of the difference between the first flow velocity and the second flow velocity;

[0123] Obtain the target flow velocity difference range;

[0124] The absolute value of the difference between the first flow velocity and the second flow velocity is compared with the target flow velocity difference range, and the first flow velocity and the second flow velocity are controlled based on the comparison result.

[0125] The absolute value of the difference between the first flow velocity and the second flow velocity is compared with the target flow velocity difference range, and the first and second flow velocities are controlled based on the comparison result, including:

[0126] If the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range, adjust the first flow velocity and the second flow velocity so that the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

[0127] The control methods for coating machines also include:

[0128] Obtain the first target flow velocity range;

[0129] Based on the fact that the first flow velocity is within the first target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the first flow velocity is kept constant.

[0130] If the first flow velocity is not within the first target flow velocity range, adjust the first flow velocity to the first target flow velocity range.

[0131] Optionally, the control method for the coating machine may also include: issuing an abnormality warning signal if the first flow rate is not within the first target flow rate range.

[0132] The control methods for coating machines also include:

[0133] Obtain the second target flow velocity range;

[0134] Since the second flow velocity is within the second target flow velocity range, and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range, the second flow velocity is kept constant.

[0135] If the second flow velocity is not within the second target flow velocity range, adjust the second flow velocity to the second target flow velocity range.

[0136] Optionally, an abnormality warning signal may be issued if the second flow velocity is not within the second target flow velocity range.

[0137] Optionally, the control methods for the coating machine also include:

[0138] An abnormality warning signal is issued if the absolute value of the difference between the first and second flow velocities is not within the target flow velocity difference range.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control method for a coating machine, characterized in that, include: The first flow rate of the coating machine delivering coating to one side of the electrode sheet and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet are obtained in real time. Calculate the absolute value of the difference between the first flow velocity and the second flow velocity; Obtain the target flow velocity difference range; Obtain the first target flow velocity range; Obtain the second target flow velocity range; If the absolute value of the difference between the first flow rate and the second flow rate is not within the target flow rate difference range, adjust the first flow rate and / or the second flow rate so that the absolute value of the difference between the first flow rate and the second flow rate is within the target flow rate difference range. If the first flow velocity is not within the first target flow velocity range, adjust the first flow velocity so that it falls within the first target flow velocity range. If the second flow velocity is not within the second target flow velocity range, adjust the second flow velocity so that it falls within the second target flow velocity range.

2. The control method for the coating machine according to claim 1, characterized in that, The control method for the coating machine also includes: The first flow rate is kept constant if the first flow rate is within the first target flow rate range and the absolute value of the difference between the first flow rate and the second flow rate is within the target flow rate difference range.

3. The control method for the coating machine according to claim 2, characterized in that, The control method for the coating machine also includes: An abnormality warning signal is issued if the first flow velocity is not within the first target flow velocity range.

4. The control method for a coating machine according to any one of claims 1-3, characterized in that, The control method for the coating machine also includes: The second flow velocity is maintained constant as long as the second flow velocity is within the second target flow velocity range and the absolute value of the difference between the first flow velocity and the second flow velocity is within the target flow velocity difference range.

5. The control method for the coating machine according to claim 4, characterized in that, An abnormality warning signal is issued if the second flow velocity is not within the second target flow velocity range.

6. The control method for a coating machine according to claim 1, characterized in that, The control method for the coating machine also includes: An abnormality warning signal is issued if the absolute value of the difference between the first flow velocity and the second flow velocity is not within the target flow velocity difference range.

7. A control device for a coating machine, used in the control method of the coating machine as described in any one of claims 1-6, characterized in that, include: The acquisition module is configured to acquire the target flow rate difference range, and to acquire in real time the first flow rate of the coating machine delivering coating to one side of the electrode sheet, and the second flow rate of the coating machine delivering coating to the other side of the electrode sheet; The control module is communicatively connected to the acquisition module. The control module is used to calculate the absolute value of the difference between the first flow velocity and the second flow velocity. The control module is also used to compare the absolute value of the difference between the first flow velocity and the second flow velocity with the target flow velocity difference range, and control the first flow velocity and the second flow velocity based on the comparison result.

8. A storage medium, said storage medium being a computer-readable storage medium, said computer-readable storage medium storing a program, characterized in that, When the program is run, it executes the control method for the coating machine as described in any one of claims 1-6.

9. A coating machine, characterized in that, Includes the control device for the coating machine as described in claim 7.

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