Cold press pressure control method and electronic equipment

Abstract

The present application provides a cold press pressure control method and electronic device, the method comprising: obtaining the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment; determining the cold press output pressure or cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press according to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as the preset first correlation or second correlation; controlling the cold press to output pressure according to the cold press output pressure or the cold press adjustment pressure, so that the cold press can cold press the electrode according to the cold press output pressure at the next moment. In this way, the pressure output by the cold press can be adaptively adjusted so that the output pressure of the cold press matches the actual rolling speed. In addition, the present application simultaneously considers the influence of the electrode thickness and the rolling speed of the cold press on the pressure required for the electrode, so that the pressure output by the cold press can be more in line with actual needs.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing, and in particular to a cold press pressure control method and electronic equipment. Background Art

[0002] The production process for battery pole pieces typically includes pulping, coating, drying, rolling, and cutting. While the manufacturing process may vary between manufacturers and batteries, rolling is essential. After rolling, the pole pieces achieve a certain compaction density, which is crucial for improving battery energy density.

[0003] Currently, electrode rolling is usually achieved using roller cold pressing technology, that is, the electrode is rolled using a cold press to achieve the designed compaction density. The current pressure control method for the cold press is to pre-set the corresponding rolling speed and pressure for the cold press, so that after the cold press is running, the electrode is cold pressed at the set speed and pressure.

[0004] However, the current method does not match the pressure with the actual speed. The current cold press pressure control technology only controls the pressure according to the cold press speed, which cannot meet the actual needs well, resulting in large errors in the pole pieces after rolling. Summary of the Invention

[0005] In view of the above problems, the present application provides a cold press pressure control method and electronic equipment to solve the problem that the existing cold press pressure control technology cannot meet the actual needs well, resulting in large errors in the pole pieces after rolling.

[0006] In the first aspect, the present application provides a cold press pressure control method, comprising: obtaining the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment; determining the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press according to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as a preset first association relationship; or determining the cold press output pressure corresponding to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press according to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as a preset second association relationship. Determine the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press; wherein, the first association relationship is the association relationship between the electrode thickness, the rolling speed of the cold press, and the output pressure of the cold press; the second association relationship is the association relationship between the electrode thickness, the rolling speed of the cold press, and the cold press adjustment pressure; control the cold press to output pressure according to the cold press output pressure or the cold press adjustment pressure, so that the cold press can cold press the electrode according to the cold press output pressure at the next moment.

[0007] In the technical solution provided by the present application, when the rolling speed fluctuates, the pressure output by the cold press can be adaptively adjusted according to the current rolling speed, so that the pressure output by the cold press matches the actual rolling speed of the cold press. In addition, the technical solution provided by the present application combines the current thickness of the electrode after cold pressing and the current rolling speed of the cold press to control the pressure of the cold press. This means that when controlling the pressure of the cold press, not only the influence of the rolling speed of the cold press on the pressure required for the electrode is considered, but also the influence of the thickness of the electrode on the required pressure is considered, so that the pressure output by the cold press can be more in line with actual needs, thereby making the error of the obtained electrode smaller.

[0008] In some embodiments, based on the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, the output pressure of the cold press corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: determining the current working condition of the cold press according to the current rolling speed and the rolling speed at the previous moment; determining the output pressure of the cold press corresponding to the current thickness of the electrode and the current rolling speed of the cold press according to the current thickness and the current rolling speed, and the first association relationship corresponding to the current working condition. output pressure; according to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as the preset second association relationship, determine the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, including: determining the current working condition of the cold press according to the current rolling speed and the rolling speed at the previous moment; determining the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press according to the current thickness and the current rolling speed, and the second association relationship corresponding to the current working condition.

[0009] It should be understood that in actual application, after the cold press is set to the target rolling speed and started, the rolling speed of the cold press does not directly change to the target rolling speed. There is a process of gradually increasing the rolling speed in the middle, and only then will it reach the target rolling speed and reach a relatively stable state. In addition, when the cold press is shut down or slowed down, there will also be a process of gradually decreasing the rolling speed. In the different processes of gradually increasing the rolling speed, maintaining a stable rolling speed, and gradually decreasing the rolling speed, for the cold press, they are actually in different working conditions. The inventors have found through a large number of experiments that there are significant differences between the first correlation and the second correlation under these different working conditions, that is, under different working conditions, the correlation between the thickness of the electrode after cold pressing, the rolling speed of the cold press, and the pressure required to achieve the cold pressing target is quite different and does not have good versatility. In the above implementation scheme, the pressure control of the cold press is performed by adopting the first correlation or the second correlation under different working conditions. This enables the pressure control of the cold press to be implemented according to the actual correlation of different working conditions. Compared with the method of adopting a general correlation to achieve pressure control, the pressure output by the cold press can be more in line with actual needs, thereby making the obtained electrode error smaller.

[0010] In some embodiments, obtaining the current thickness of the electrode after cold pressing at the current moment includes: obtaining a current first thickness of the electrode on the operating side of the cold press and a current second thickness of the electrode on the transmission side of the cold press;

[0011] According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: according to the current first thickness and the current rolling speed, and the preset first association relationship corresponding to the operating side, the first cold press output pressure corresponding to the operating side is determined; according to the current second thickness and the current rolling speed, and the preset first association relationship corresponding to the transmission side, the second cold press output pressure corresponding to the transmission side is determined;

[0012] According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset second association relationship, the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: according to the current first thickness and the current rolling speed, and the preset second association relationship corresponding to the operating side, the first cold press adjustment pressure corresponding to the operating side is determined; according to the current second thickness and the current rolling speed, and the preset second association relationship corresponding to the transmission side, the second cold press adjustment pressure corresponding to the transmission side is determined;

[0013] Controlling the cold press to output pressure according to the output pressure of the cold press or the adjustment pressure of the cold press includes: controlling the operating side of the cold press to output pressure according to the output pressure of the first cold press or the adjustment pressure of the first cold press; controlling the transmission side of the cold press to output pressure according to the output pressure of the second cold press or the adjustment pressure of the second cold press.

[0014] It should be understood that in actual applications, the cold press roller is divided into an operating side and a transmission side. The so-called operating side refers to the side of the cold press roller close to the user's operating table, while the transmission side refers to the side of the cold press roller away from the user's operating table and connected to the motor for controlled rotation. Affected by factors such as the different connection distances with the motor, the correlation between the thickness of the electrode after cold pressing, the rolling speed of the cold press, and the pressure required to achieve the cold pressing target will be different between the operating side and the transmission side. In the above implementation scheme, the pressure control of the transmission side is achieved by respectively adopting the electrode thickness on the transmission side and the first correlation or the second correlation on the transmission side, and the pressure control of the operating side is achieved by adopting the electrode thickness on the operating side and the first correlation or the second correlation on the operating side. This allows differentiated pressure control to be achieved on both sides of the cold press roller, so that the output pressure is more in line with actual needs, and the resulting electrode error is smaller.

[0015] In some embodiments, the first association relationship includes: the unit thickness adjustment pressure of the cold press required to be adjusted when the electrode sheet undergoes a unit thickness change, and a second association sub-table between the rolling speed of the cold press and the cold press adjustment pressure; the cold press adjustment pressure includes: thickness adjustment pressure and speed adjustment pressure;

[0016] According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as a preset second association relationship, the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: judging whether the current thickness of the electrode after cold pressing meets the preset first pressure control condition, and judging whether the current rolling speed of the cold press meets the preset second pressure control condition; when the current thickness of the electrode after cold pressing meets the preset first pressure control condition, the current thickness adjustment pressure is determined according to the difference between the current thickness of the electrode after cold pressing and the preset target thickness, and the unit thickness adjustment pressure; when the current rolling speed meets the preset second pressure control condition, according to the speed range in which the current rolling speed is located, the current speed adjustment pressure corresponding to the current rolling speed is determined according to the adjustment pressures corresponding to different speed ranges;

[0017] Correspondingly, the cold press is controlled to output pressure according to the pressure adjustment of the cold press, including: controlling the cold press to output pressure according to the current thickness adjustment pressure and / or the current speed adjustment pressure, and the current actual output pressure of the cold press.

[0018] In the above implementation, by setting the first pressure control condition and the second pressure control condition, excessive pressure control can be avoided, and the pressure control frequency can be controlled within the acceptable error range allowed by the electrode thickness during the cold pressing process, thereby preventing high-frequency control from affecting the life of the cold press. By pre-obtaining the second associated sub-table between the unit thickness adjustment pressure and the rolling speed of the cold press and the cold press adjustment pressure, independent control of thickness changes and speed changes can be achieved during pressure control, which is more in line with the control logic of existing cold presses.

[0019] In some embodiments, the first pressure control condition is: the difference between the current thickness of the electrode obtained n1 times in a row and the preset target thickness is greater than the preset first thickness change threshold; or, the difference between the current thickness of the electrode obtained n2 times in a row and the preset target thickness is less than the preset second thickness change threshold; both n1 and n2 are positive integers greater than or equal to 1; the first thickness change threshold is greater than the second thickness change threshold.

[0020] In the above implementation scheme, the difference between the current thickness of the electrode and the preset target thickness is used as the basis for judgment, and the difference between the current thickness of the electrode and the preset target thickness can reflect the cold pressing effect. Therefore, through the above scheme, when it is identified that the cold pressing effect of the electrode is not very good, pressure control can be carried out in time to ensure the cold pressing effect of the electrode.

[0021] In some embodiments, the second pressure control condition is: the current rolling speed change is greater than the preset first speed change threshold, or the current rolling speed change is less than the preset second speed change threshold; wherein: the current rolling speed change is the difference between the current rolling speed of the cold press and the previous rolling speed; the first speed change threshold is greater than the second speed change threshold.

[0022] In the above implementation scheme, by using the difference between the current rolling speed of the cold press and the previous rolling speed as the judgment basis, it is possible to effectively identify situations where the rolling speed changes significantly, so that pressure control can be made in time to ensure the cold pressing effect of the electrode.

[0023] In some embodiments, the first correlation relationship and the second correlation relationship are regression models with thickness, velocity, and pressure as variable values.

[0024] In the above implementation scheme, the first association relationship or the second association relationship is realized by a regression model, which means that when constructing the first association relationship or the second association relationship, only a large amount of sampling is needed to construct the corresponding regression simulation, and the scheme is simple and reliable to implement.

[0025] In some embodiments, after the cold press is shut down and restarted, the method further includes: obtaining the latest current thickness of the pole piece after cold pressing and the latest current rolling speed of the cold press; determining the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed based on the latest current thickness and the latest current rolling speed, as well as the regression model before shutdown and restart; controlling the pressure output of the cold press after shutdown and restart based on the cold press output pressure or the cold press adjustment pressure, so that the cold press can cold press the pole piece according to the cold press output pressure at the next moment.

[0026] In the above implementation scheme, after the cold press is shut down and restarted, pressure control is performed based on the regression model before the shutdown and restart, which can ensure that the cold press can operate normally in the initial stage after the shutdown and restart, and can ensure the cold pressing effect to a certain extent.

[0027] In some embodiments, after determining the cold press output pressure or cold press adjustment pressure corresponding to the current thickness and the current rolling speed based on the latest current thickness and the latest current rolling speed, and the regression model before shutdown and restart, and controlling the pressure output of the cold press after shutdown and restart based on the cold press output pressure or the cold press adjustment pressure, the method further includes: re-obtaining the latest current thickness of the pole piece and the latest current rolling speed of the cold press under the latest output pressure value of the cold press; when the re-obtained latest current thickness meets the preset reasonable thickness condition, and the re-obtained latest current rolling speed meets the preset reasonable speed condition, updating the model parameters of the regression model based on the re-obtained latest current thickness, the re-obtained latest current rolling speed, and the pressure value.

[0028] In the above implementation scheme, the model parameters of the regression model are updated by re-acquiring the latest current thickness, the latest current rolling speed, and the pressure value, thereby realizing the automatic update of the regression model, thereby ensuring that in scenarios where there are major changes in the conditions of equipment components such as cutting and pulling, adjusting the roll gap, replacing the rolls, equipment maintenance, etc., the scheme can be adaptive without the need for manual intervention and re-modeling.

[0029] In a second aspect, the present application also provides an electronic device comprising: a processor, a memory and a communication bus; the communication bus is used to realize connection and communication between the processor and the memory; the processor is used to execute one or more programs stored in the memory to realize any of the above-mentioned cold press pressure control methods.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic flow chart of a cold press pressure control method provided in an embodiment of the present application;

[0033] Figure 2A flow chart of another cold press pressure control method provided in an embodiment of the present application;

[0034] Figure 3 A more specific schematic diagram of the pressure control flow of a cold press provided in an embodiment of the present application;

[0035] Figure 4 A schematic structural diagram of a cold press pressure control device provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] Example 1:

[0046] Currently, market developments indicate that power batteries are becoming increasingly widespread. They are used not only in energy storage systems such as hydropower, thermal, wind, and solar power plants, but also in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing. This increasing market demand is also driving higher quality requirements for power batteries.

[0047] The inventors of the present invention have noticed that in the manufacturing process of power batteries, the current cold pressing process of battery pole pieces usually involves pre-setting the corresponding operating speed and pressure for the cold press, so that after the cold press is running, the pole pieces are cold pressed according to the set speed and pressure. However, during the entire process from activation to shutdown of the cold press, the rolling speed is not always stable at the set rolling speed. Therefore, in the current method, there is a mismatch between the pressure and the actual rolling speed. The mismatch between the pressure and the actual rolling speed may result in the compaction density of the pole piece after rolling being unable to meet the preset error requirements, resulting in poor pole piece quality, and further resulting in poor energy density of the manufactured battery.

[0048] In order to solve the problem that the existing cold press pressure control technology cannot meet the actual needs well, resulting in a large error in the electrode after rolling, the applicant has found that in the process of cold pressing the electrode, in order to ensure that the effect of the electrode after cold pressing meets the expectations, there is an inherent complementary relationship between the thickness of the electrode after cold pressing, the rolling speed of the cold press and the pressure applied by the cold press. In the present application, by pre-constructing and saving this relationship, and then obtaining the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, based on this relationship, when the rolling speed fluctuates, the pressure output by the cold press can be adaptively adjusted, so that the pressure output by the cold press matches the actual rolling speed of the cold press. In addition, the present application not only takes into account the influence of the thickness of the electrode on the required pressure, but also takes into account the influence of the rolling speed of the cold press on the pressure required for the electrode, so that the pressure output by the cold press can be more in line with actual needs and the obtained electrode error is smaller.

[0049] See below. Figure 1 As shown, Figure 1 A cold press pressure control method provided in an embodiment of the present application is shown, comprising:

[0050] S101: Obtain the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment.

[0051] It should be noted that in the embodiment of the present application, a thickness gauge is provided on or around the cold press so that the current thickness of the electrode after cold pressing can be measured. It should be understood that the current thickness of the electrode after cold pressing refers to the thickness of the electrode at the current rolling point after cold pressing.

[0052] It should also be noted that in the embodiment of the present application, a speed sensor or a rotation speed sensor can also be set on the cold press, so that the current rolling speed of the cold press can be collected and obtained.

[0053] S102: According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, determine the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press.

[0054] It should be noted that, in the embodiment of the present application, the first correlation relationship refers to the correlation relationship between the thickness of the electrode, the rolling speed of the cold press, and the output pressure of the cold press.

[0055] In an embodiment of the present application, the first correlation relationship can be constructed in advance by engineers by collecting a large amount of data on the thickness of the electrode after cold pressing, the rolling speed of the cold press at that time, and the output pressure of the cold press at that time at each sampling point in the electrode that meets the set requirements after cold pressing, and then constructing the first correlation relationship based on this.

[0056] S103: controlling the cold press to output pressure according to the output pressure of the cold press, so that the cold press can cold-press the electrode according to the output pressure of the cold press at the next moment.

[0057] It should be noted that in the embodiments of this application, the cold press output pressure refers to the pressure value that the cold press is ultimately required to output. After determining the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, the cold press is simply controlled to output pressure according to the cold press output pressure.

[0058] Also, see Figure 2 As shown, Figure 2 Another cold press pressure control method provided in an embodiment of the present application is shown, comprising:

[0059] S201: Obtain the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment.

[0060] Similarly, in the embodiment of the present application, a thickness gauge is provided on or around the cold press to measure the current thickness of the electrode after cold pressing. A speed sensor or rotation speed sensor may also be provided on the cold press to measure the current rolling speed of the cold press.

[0061] S202: According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as the preset second association relationship, determine the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press.

[0062] It should be noted that, in the embodiment of the present application, the second correlation relationship refers to the correlation relationship between the thickness of the electrode, the rolling speed of the cold press, and the adjustment pressure of the cold press.

[0063] In an embodiment of the present application, the second correlation relationship can be constructed in advance by engineers through a large amount of data collected in advance by the engineers after the electrode is cold pressed, including the thickness of the electrode after cold pressing, the rolling speed of the cold press at that time, and the pressure adjusted by the cold press at that time relative to the previous moment at each sampling point in the electrode that meets the set requirements, and then.

[0064] S203: adjusting the pressure of the cold press to control the cold press to output pressure, so that the cold press can cold-press the electrode according to the output pressure of the cold press at the next moment.

[0065] In the embodiments of the present application, the cold press adjustment pressure refers to the pressure value to which the cold press needs to be adjusted. A positive value indicates an increase in pressure, while a negative value indicates a decrease in pressure. After determining the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, control can be achieved by simply increasing or decreasing the corresponding cold press adjustment pressure based on the current output pressure of the cold press.

[0066] As described above, through the first association relationship or the second association relationship, the pressure output by the cold press can be adaptively adjusted as the current thickness of the electrode after cold pressing and the current rolling speed of the cold press change, so that the pressure output by the cold press matches the actual rolling speed of the cold press and the actual cold pressing effect of the electrode after cold pressing, so that the pressure output by the cold press can be more in line with actual needs and the resulting electrode error is smaller.

[0067] In some embodiments of the present application, a regression model may be constructed, and the constructed regression model may be used as the first association relationship or the second association relationship.

[0068] For example, a regression model can be constructed based on the collected data that the electrode meets the set requirements after cold pressing, the thickness of the electrode after cold pressing at each sampling point, the rolling speed of the cold press at that time, and the output pressure of the cold press at that time, and then the regression model is used as the first correlation relationship.

[0069] It should be noted that in the embodiment of the present application, in order to construct a regression model that can serve as the first correlation relationship, each sampling point can be mapped to a three-dimensional coordinate system with the thickness of the electrode after cold pressing, the rolling speed of the cold press and the output pressure of the cold press as coordinate axes, and then the regression model can be obtained through fitting and other methods.

[0070] For example, a regression model can be constructed based on the collected data of the thickness of the electrode after cold pressing at each sampling point, the rolling speed of the cold press at that time, and the pressure adjusted by the cold press relative to the previous moment, which meets the set requirements after cold pressing. The regression model is then used as the second correlation relationship.

[0071] It should be noted that in the embodiment of the present application, in order to construct a regression model that can serve as the second correlation relationship, each sampling point can be mapped to a three-dimensional coordinate system with the thickness of the electrode after cold pressing, the rolling speed of the cold press and the adjustment pressure of the cold press as coordinate axes, and then the regression model can be obtained through fitting and other methods.

[0072] It should also be noted that in the embodiment of the present application, the regression model can be a linear regression model, and the structure is z=a+b*x+c*y. Wherein: z is the thickness of the electrode after cold pressing; x is the rolling speed of the cold press; y is the output pressure of the cold press or the pressure adjusted by the cold press; a, b, and c are model parameters, which are constant values ​​determined. In addition, the regression model can also be a nonlinear regression model, such as z=a+b*x 2 +c*y 2 In the embodiments of the present application, there is no limitation on the implementation form of the regression model used.

[0073] It should be understood that in the embodiment of the present application, the constructed regression model can be directly substituted into the current thickness of the electrode after cold pressing (i.e., the z value) and the current rolling speed of the cold press (i.e., the x value) obtained at the current moment to obtain the corresponding required y value (i.e., the output pressure of the cold press or the pressure adjusted for the cold press), and then the pressure output control of the cold press can be realized according to the above-mentioned step S103 or step S203.

[0074] It should also be understood that, in the embodiment of the present application, the above-mentioned regression model can also be tabulated, so that the tabulated table can be used as the first association relationship or the second association relationship.

[0075] For example, the cold press output pressure or cold press adjustment pressure corresponding to different electrode thicknesses and different rolling speeds can be obtained according to a preset value interval to obtain a discrete data table, such as shown in Table 1 below:

[0076] Table 1

[0077]

[0078] It should be understood that after obtaining the discrete data table, when using it, you can first determine whether the current thickness of the electrode after cold pressing and the current rolling speed of the cold press have the same data in the above table. Then, when the same data exists, you can determine the adjustment pressure of the cold press based on the above table.

[0079] Alternatively, when in use, you can first determine which two numerical ranges the current thickness of the electrode after cold pressing and the current rolling speed of the cold press fall within, and then determine the cold press adjustment pressure based on the smaller value (or larger value, which can be set by the engineer) of the numerical range. For example, assuming that the current thickness of the electrode after cold pressing and the current rolling speed of the cold press are z1 and x1 respectively, and z1 is greater than z0+△z but less than z0+2△z, and x1 is greater than x0 but less than x0+△x, then you can take the cold press output pressure corresponding to z0+△z and x0, and determine that the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press is y1.

[0080] It should also be understood that the above table shows the second correlation relationship, so what is determined is the cold press adjustment pressure. The tabular form of the first correlation relationship and the way of using the table are consistent with the above method and will not be repeated here.

[0081] It is worth noting that, with respect to the second correlation, the inventors discovered after extensive experiments that the cold press adjustment pressure can be considered the sum of the adjustment pressure required for the change in electrode thickness and the adjustment pressure required for the change in rolling speed. Therefore, in the embodiments of the present application, the second correlation can also be recorded through a correlation table between electrode thickness and cold press unit thickness adjustment pressure (e.g., Table 2 below) and a correlation table between rolling speed and speed adjustment pressure (e.g., Table 3 below):

[0082] Table 2

[0083]

[0084] It should be noted that the so-called unit thickness adjustment pressure refers to the unit thickness adjustment pressure required by the cold press to correspond to a unit thickness change in the electrode. In this application, the electrode thickness column in Table 2 represents intervals. For example, z0 represents the thickness range from z0 (inclusive) to z0 + Δz (exclusive).

[0085] Table 3

[0086]

[0087] It should be noted that, in this application, the column of rolling speeds in Table 3 represents an interval, such as x0, which represents the rolling speed interval from x0 (inclusive) to x0+△x (exclusive).

[0088] It should also be noted that, in the embodiment of the present application, the division of the intervals, that is, the values ​​of △z and △x, can be set by engineers according to the process requirements of the cold pressing of the electrode.

[0089] When in use, after obtaining the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, you only need to correspond the current thickness of the electrode after cold pressing to Table 2 and the current rolling speed of the cold press to Table 3 to determine the total cold press adjustment pressure.

[0090] For example, for the thickness adjustment pressure, it is possible to determine which interval in Table 2 the current thickness corresponds to, and then determine the corresponding unit thickness adjustment pressure. Then, based on the difference between the current thickness of the electrode after cold pressing and the preset target thickness, multiply it by the unit thickness adjustment pressure to obtain the current thickness adjustment pressure.

[0091] It should be noted that in actual applications, the inventors have found through extensive experiments that for different thickness ranges, the unit thickness adjustment pressure required by the cold press for each unit thickness change of the electrode is similar. Therefore, in an optional implementation of the embodiment of the present application, Table 2 can be simplified to a unit thickness adjustment pressure. After obtaining the current thickness of the electrode after cold pressing, the current thickness adjustment pressure can be obtained by multiplying the difference between the current thickness of the electrode after cold pressing and the preset target thickness by the unit thickness adjustment pressure.

[0092] For example, for the speed adjustment pressure, it is possible to determine which speed interval the current rolling speed is in in Table 3, and then determine the current speed adjustment pressure corresponding to the current rolling speed.

[0093] It should be understood that in the above method, in order to ensure the pressure control effect and to avoid too frequent pressure control affecting the life of the cold press, before determining the current thickness adjustment pressure and the current speed adjustment pressure, it is possible to first judge whether the current thickness of the electrode after cold pressing meets the preset first pressure control condition, and whether the current rolling speed of the cold press meets the preset second pressure control condition.

[0094] When the current thickness of the electrode after cold pressing meets the preset first pressure control condition, the current thickness adjustment pressure is determined according to the difference between the current thickness of the electrode after cold pressing and the preset target thickness, and the unit thickness adjustment pressure.

[0095] When the current rolling speed of the cold press meets the preset second pressure control condition, the current speed adjustment pressure corresponding to the current rolling speed is determined according to the speed range in which the current rolling speed is located and the adjustment pressure corresponding to different speed ranges.

[0096] It should be understood that if the first pressure control condition is met but the second pressure control condition is not met, the current thickness adjustment pressure determined will be used as the cold press adjustment pressure, thereby controlling the cold press to output pressure. If the first pressure control condition is not met but the second pressure control condition is met, the current speed adjustment pressure determined will be used as the cold press adjustment pressure, thereby controlling the cold press to output pressure. If both the first pressure control condition and the second pressure control condition are met, the sum of the current thickness adjustment pressure and speed adjustment pressure determined will be used as the cold press adjustment pressure, thereby controlling the cold press to output pressure. If both the first pressure control condition and the second pressure control condition are not met, no pressure adjustment will be performed.

[0097] In an embodiment of the present application, the first pressure control condition may be: the difference between the current thickness of the electrode obtained n1 times in a row and the preset target thickness is greater than the preset first thickness change threshold; or the difference between the current thickness of the electrode obtained n2 times in a row and the preset target thickness is less than the preset second thickness change threshold.

[0098] Wherein, n1 and n2 are both positive integers greater than or equal to 1, and their values ​​can be set by engineers according to actual needs, for example, they can be set to 1 or 2. In addition, the first thickness change threshold should be greater than the second thickness change threshold.

[0099] In an embodiment of the present application, the second pressure control condition may be: the current rolling speed change is greater than a preset first speed change threshold, or the current rolling speed change is less than a preset second speed change threshold.

[0100] The current rolling speed change refers to the difference between the current rolling speed of the cold press and the rolling speed at the previous moment. In addition, the first speed change threshold should be greater than the second speed change threshold.

[0101] In the embodiment of the present application, the first thickness change threshold, the second thickness change threshold, the first speed change threshold, and the second speed change threshold can be set by engineers according to actual needs.

[0102] It should be noted that in actual application, after the cold press is set to the target rolling speed and started, the rolling speed of the cold press does not directly change to the target rolling speed. There is a process of gradually increasing the rolling speed in the middle, and only then will it reach the target rolling speed and reach a relatively stable state. In addition, when the cold press is shut down or slowed down, there will also be a process of gradually decreasing the rolling speed. In the different processes of gradually increasing the rolling speed, maintaining a stable rolling speed, and gradually decreasing the rolling speed, for the cold press, they are actually in different working conditions. The inventors have found through a large number of experiments that there are significant differences between the first correlation and the second correlation under these different working conditions, that is, under different working conditions, the correlation between the thickness of the electrode after cold pressing, the rolling speed of the cold press, and the pressure required to achieve the cold pressing target is quite different and does not have good versatility.

[0103] To this end, in some implementations of the embodiments of the present application, when constructing the first association relationship or the second association relationship, the first association relationship or the second association relationship corresponding to each operating condition can be separately constructed for each operating condition.

[0104] Then, when performing cold press pressure control, the current working condition of the cold press can be determined first based on the current rolling speed of the cold press and the rolling speed of the previous moment, and then the cold press output pressure or cold press adjustment pressure corresponding to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press, as well as the first correlation or second correlation corresponding to the current working condition, can be determined.

[0105] It should be noted that the construction method of the first association relationship or the second association relationship corresponding to each working condition can be referred to the above description. The difference is that the first association relationship or the second association relationship corresponding to each working condition should be constructed based on the data of the sampling points in each working condition.

[0106] It should also be noted that the process of determining the cold press output pressure or cold press adjustment pressure corresponding to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press, as well as the first correlation or second correlation corresponding to the current working conditions, can be found in the previous article and will not be repeated here.

[0107] It should be noted that, in the embodiment of the present application, in order to accurately determine the current operating condition, the operating condition detection can be performed in the following manner:

[0108] When the current rolling speed is not within the preset standard operating speed range, and the current rolling speed is higher than the rolling speed at the previous moment, and the speed change rate of the current rolling speed compared to the rolling speed at the previous moment is greater than the first preset change rate threshold, it is determined that the current operating condition of the cold press is the speed-up condition.

[0109] When the current rolling speed and the rolling speed at the previous moment are both within the standard operating speed range, it is determined that the current operating condition of the cold press is a steady-speed operating condition.

[0110] When the current rolling speed is not within the standard operating speed range, and the current rolling speed is lower than the rolling speed at the previous moment, and the speed change rate of the rolling speed at the previous moment compared to the current rolling speed is greater than the third preset change rate threshold, it is determined that the current operating condition of the cold press is a deceleration condition.

[0111] In addition, in the process of sampling data to construct the first association relationship or the second association relationship, the above method can also be used to determine the operating condition to which each sampling point belongs.

[0112] It should also be noted that in actual applications, the cold press roller is divided into the operating side and the transmission side. The so-called operating side refers to the side of the cold press roller close to the user's operating table, while the transmission side refers to the side of the cold press roller away from the user's operating table and connected to the motor for controlled rotation. Due to factors such as the different connection distances with the motor, the correlation between the thickness of the pole piece after cold pressing, the rolling speed of the cold press, and the pressure required to achieve the cold pressing target will vary between the operating side and the transmission side.

[0113] To this end, in an embodiment of the present application, corresponding first association relationships or second association relationships can be established for the operation side and transmission side of the cold press respectively.

[0114] Therefore, in step S101 and step S201 , the current first thickness of the pole piece on the operating side of the cold press and the current second thickness on the transmission side of the cold press may be obtained.

[0115] Furthermore, in step S102, the first cold press output pressure corresponding to the operating side can be determined based on the current first thickness and the current rolling speed of the cold press, as well as the preset first association relationship corresponding to the operating side, and the second cold press output pressure corresponding to the transmission side can be determined based on the current second thickness and the current rolling speed, as well as the first association relationship corresponding to the transmission side.

[0116] In step S202, the first cold press adjustment pressure corresponding to the operating side can be determined based on the current first thickness and the current rolling speed, as well as the second association relationship corresponding to the operating side; the second cold press adjustment pressure corresponding to the transmission side can be determined based on the current second thickness and the current rolling speed, as well as the second association relationship corresponding to the transmission side.

[0117] Furthermore, in step S103, the operating side of the cold press is controlled to output pressure according to the output pressure of the first cold press; and the transmission side of the cold press is controlled to output pressure according to the output pressure of the second cold press.

[0118] In step S203, the pressure of the first cold press is adjusted to control the operating side of the cold press to output pressure; and the pressure of the second cold press is adjusted to control the transmission side of the cold press to output pressure.

[0119] In this way, the pressure control on the transmission side is achieved by respectively adopting the pole piece thickness on the transmission side and the first correlation or the second correlation on the transmission side, and the pressure control on the operating side is achieved by adopting the pole piece thickness on the operating side and the first correlation or the second correlation on the operating side, so that differentiated pressure control can be achieved on both sides of the cold press roller, so that the output pressure can be more in line with actual needs, and the obtained pole piece error can be smaller.

[0120] It should be noted that in the embodiment of the present application, N (N is an even number greater than 0) thickness gauges and speed sensors can be evenly arranged along the rotation axis of the pressure roller of the cold press, so that each side has N / 2 sampling points each time to ensure sufficient sample data on both sides.

[0121] It should be noted that in the embodiment of the present application, after the cold press is shut down and restarted, in order to ensure the cold pressing effect, the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed can be determined based on the latest current thickness and the latest current rolling speed, as well as the regression model before shutdown and restart.

[0122] Then, the pressure output of the cold compressor is performed according to the output pressure of the cold compressor or the pressure control of the cold compressor after shutdown and restart, so that the cold compressor can cold-press the electrode according to the output pressure of the cold compressor at the next moment.

[0123] It should be noted that the above process of determining the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed based on the regression model before the shutdown and restart can be a process of directly calculating the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed based on the regression model before the shutdown and restart. In addition, the process can also be a process of obtaining the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed based on the tabular first correlation or second correlation determined by the regression model before the shutdown and restart.

[0124] It should be noted that in scenarios where there are significant changes in equipment components, such as cutting and drawing, changing the roll gap, adjusting the rolls, replacing the rolls, and equipment maintenance, the original regression model may have large deviations and thus be less applicable.

[0125] To this end, in an embodiment of the present application, the cold press output pressure or cold press adjustment pressure corresponding to the current thickness and current rolling speed is determined based on the latest current thickness and the latest current rolling speed, as well as the regression model before shutdown and restart. After the cold press is controlled to output pressure after shutdown and restart based on the cold press output pressure or the cold press adjustment pressure, the latest current thickness of the electrode and the latest current rolling speed of the cold press at the latest output pressure value of the cold press can be obtained again.

[0126] When the latest current thickness reacquired meets the preset reasonable thickness conditions and the latest current rolling speed reacquired meets the preset reasonable speed conditions, the model parameters of the regression model are updated according to the latest current thickness reacquired, the latest current rolling speed reacquired, and the pressure value output by the cold press.

[0127] For example, if the regression model is a regression model that characterizes the first correlation relationship, it is only necessary to add the latest current thickness, the latest current rolling speed, and the pressure value output by the cold press as new samples to the sample set and re-fit them, so as to update the model parameters of the regression model.

[0128] If the regression model is a regression model that characterizes the second correlation relationship, it is only necessary to add the latest current thickness that has been reacquired, the latest current rolling speed that has been reacquired, and the difference between the latest pressure value output by the cold press and the pressure value output at the previous moment as new samples to the sample set for refitting, thereby achieving the update of the model parameters of the regression model.

[0129] In this way, the regression model can be automatically updated, thereby ensuring that in scenarios where there are significant changes in equipment components such as cutting and pulling, adjusting the roll gap, replacing rolls, and equipment maintenance, the solution can be adaptive without the need for manual intervention and remodeling.

[0130] It should be noted that in the embodiment of the present application, each time a roll of electrode is cold pressed, the pressure data and corresponding rolling speed and electrode thickness that meet the design requirements obtained during the completion process can be automatically memorized, and then based on these data, the regression model can be refitted and updated.

[0131] It should also be noted that for solutions that use a tabular first correlation or a tabular second correlation to implement pressure control, after the model parameters of the regression model are updated, the tabulation should be performed again to ensure the reliability of subsequent pressure control.

[0132] It should also be noted that in the embodiment of the present application, the reasonable thickness condition can be: the difference between the latest current thickness obtained m times in a row and the preset target thickness is less than or equal to the preset third thickness change threshold, and greater than or equal to the preset fourth thickness change threshold.

[0133] Wherein, m is a positive integer greater than or equal to 1; and the third thickness change threshold is greater than the fourth thickness change threshold.

[0134] In an embodiment of the present application, the reasonable speed condition may be: the difference between the latest current rolling speed obtained again and the latest current rolling speed obtained last time is less than or equal to the preset third speed change threshold, and the difference between the latest current rolling speed obtained again and the latest current rolling speed obtained last time is greater than or equal to the preset fourth speed change threshold.

[0135] The third speed change threshold is greater than the fourth speed change threshold.

[0136] In the embodiment of the present application, the third thickness change threshold, the fourth thickness change threshold, the third speed change threshold, and the fourth speed change threshold can be set by engineers according to actual needs.

[0137] It should also be noted that, in the embodiments of the present application, the target thickness is a thickness value set according to process requirements.

[0138] The cold press pressure control method provided in the embodiment of the present application can adaptively adjust the pressure output by the cold press according to the current rolling speed when the rolling speed fluctuates, so that the pressure output by the cold press matches the actual rolling speed of the cold press. In addition, the cold press pressure control method provided in the embodiment of the present application combines the current thickness of the electrode after cold pressing and the current rolling speed of the cold press to control the pressure of the cold press. This means that when performing the cold press pressure control, not only the influence of the rolling speed of the cold press on the required pressure of the electrode is considered, but also the influence of the thickness of the electrode on the required pressure is considered, so that the pressure output by the cold press can be more in line with actual needs, thereby making the error of the obtained electrode smaller.

[0139] Example 2:

[0140] Based on the first embodiment, this embodiment takes a more specific implementation process as an example to further illustrate the technical solution of the present application.

[0141] First, the working conditions are classified and the operation process of the cold press is divided into speed-increasing condition, steady speed condition and speed-decreasing condition.

[0142] The thickness of the electrode after cold pressing, the rolling speed of the cold press and the output pressure of the cold press at each sampling point that meet the set requirements under each working condition are collected respectively.

[0143] The data of each sampling point is divided according to whether it belongs to the operation side or the transmission side of the cold press.

[0144] Taking the working condition as the unit, the data of each sampling point corresponding to the operating side in each working condition is mapped to a three-dimensional coordinate system with the thickness of the electrode after cold pressing, the rolling speed of the cold press and the output pressure of the cold press as the coordinate axes. Through fitting, the regression model of the operating side in each working condition is obtained respectively.

[0145] Taking the working condition as the unit, the data of each sampling point corresponding to the transmission side in each working condition is mapped to a three-dimensional coordinate system with the thickness of the electrode after cold pressing, the rolling speed of the cold press and the output pressure of the cold press as the coordinate axes. Through fitting, the regression model of the transmission side in each working condition is obtained respectively.

[0146] The regression model structure is z=a+b*x+c*y, where z is the thickness of the electrode after cold pressing; x is the rolling speed of the cold press; y is the output pressure of the cold press; a, b, and c are model parameters and are determined constant values.

[0147] After obtaining each regression model, each regression model is tabulated according to the process requirements and converted into a second correlation sub-table to obtain the unit thickness adjustment pressure of the cold press required to be adjusted when the electrode undergoes a unit thickness change, as well as the rolling speed of the cold press and the speed adjustment pressure.

[0148] For example, a fixed x value may be set, and then two z values ​​with unit changes are taken to obtain two y values, and then the difference between the two y values ​​is taken to obtain the unit thickness adjustment pressure XT required for adjusting the cold press.

[0149] For the second associated sub-table, a fixed z value (such as the target thickness value) can be taken, and then the speed interval can be divided according to the process requirements. For example, every 10 meters per minute is used as an interval, and the cold press output pressure corresponding to multiple speed values ​​in the speed interval is calculated. The pressure difference between the cold press output pressures corresponding to each speed value is calculated and the average value is taken to obtain the speed adjustment pressure corresponding to the speed interval, and the second associated sub-table is constructed.

[0150] For example, assuming that for the speed range of 0 meters per minute (inclusive) to 10 meters per minute (exclusive), the z value is taken as the target thickness value, and the corresponding cold press output pressures y0 to y9 when the x values ​​are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9, respectively. Calculate the differences between y1 and y0, y2 and y1, y3 and y2, ..., y9 and y8 in sequence to obtain △y1 to △y9. The average of △y1 to △y9 is the speed adjustment pressure corresponding to the speed range of 0 meters per minute (inclusive) to 10 meters per minute (exclusive).

[0151] The cold press pressure can then be controlled accordingly.

[0152] See Figure 3 As shown, including:

[0153] First, determine whether the cold press is turned on and whether the rollers start to rotate.

[0154] Detect the current thickness of the electrode after cold pressing and the current rolling speed of the cold press.

[0155] Determine the current working condition of the cold press. The determination method is described in the first embodiment and will not be repeated here.

[0156] Determine whether the current rolling speed of the cold press has increased or decreased by 10 meters per minute compared to the rolling speed at the previous moment.

[0157] If so, the second associated subtable corresponding to that working condition is called to determine the speed range of the current rolling speed and obtain the corresponding speed adjustment pressure. If the current rolling speed has increased by 10 meters per minute compared to the previous rolling speed, the cold press is controlled to increase the speed adjustment pressure; if the current rolling speed has decreased by 10 meters per minute compared to the previous rolling speed, the cold press is controlled to decrease the speed adjustment pressure.

[0158] Determine whether the difference between the current thickness of the electrode after cold pressing and the preset target thickness is less than 1 micron for two consecutive times, or whether the difference between the current thickness of the electrode after cold pressing and the preset target thickness is greater than 1 micron for two consecutive times.

[0159] If the difference between the current thickness and the preset target thickness after cold pressing is less than 1 micron for two consecutive times, the thickness adjustment pressure is calculated by multiplying the unit thickness adjustment pressure XT by the difference between the current thickness and the preset target thickness. The cold press is then controlled to reduce the thickness adjustment pressure.

[0160] If the difference between the current thickness of the electrode after cold pressing and the preset target thickness is greater than 1 micron for two consecutive times, the unit thickness adjustment pressure XT is multiplied by the difference between the current thickness and the preset target thickness to obtain the thickness adjustment pressure. The cold press is controlled to increase the thickness adjustment pressure.

[0161] After each cold pressing of a roll of electrode is completed, the pressure data and corresponding rolling speed and electrode thickness that meet the design requirements obtained during the completion process are automatically memorized. Based on these data, the regression model is refitted, the regression model is updated, and the unit thickness adjustment pressure and the second associated sub-table are updated.

[0162] Example 3:

[0163] Based on the same inventive concept, the embodiment of the present application also provides a cold press pressure control device 400 and a business request processing device 200. Figure 4 As shown, Figure 4 Shows the use of Figure 1 and Figure 2 The service request processing device of the method shown. It should be understood that the specific functions of the device 400 can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here. The device 400 includes at least one software function module that can be stored in the memory in the form of software or firmware or fixed in the operating system of the device 400. Specifically:

[0164] See also Figure 4 As shown, the apparatus 400 includes: an acquisition module 401, a determination module 402 and a control module 403. Among them:

[0165] The acquisition module 401 is used to obtain the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment;

[0166] The determination module 402 is used to determine the cold press output pressure corresponding to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as a preset first association relationship; or, to determine the cold press adjustment pressure corresponding to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, as well as a preset second association relationship; wherein the first association relationship is the association relationship between the electrode thickness, the rolling speed of the cold press, and the cold press output pressure; and the second association relationship is the association relationship between the electrode thickness, the rolling speed of the cold press, and the cold press adjustment pressure;

[0167] The control module 403 is used to control the cold press to output pressure according to the cold press output pressure or the cold press adjustment pressure, so that the cold press can cold-press the electrode according to the cold press output pressure at the next moment.

[0168] In the embodiment of the present application, the determining module 402 is specifically configured to:

[0169] Determining the current working condition of the cold press according to the current rolling speed and the rolling speed at the previous moment; determining the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press according to the current thickness and the current rolling speed, and a first correlation relationship corresponding to the current working condition;

[0170] The current working condition of the cold press is determined based on the current rolling speed and the rolling speed at the previous moment; the cold press adjustment pressure corresponding to the current thickness of the pole piece and the current rolling speed of the cold press is determined based on the current thickness and the current rolling speed, as well as the second correlation relationship corresponding to the current working condition.

[0171] In the embodiment of the present application, the acquisition module 401 is specifically used to obtain the current first thickness of the pole piece on the operating side of the cold press and the current second thickness of the pole piece on the transmission side of the cold press.

[0172] The determining module 402 is specifically configured to:

[0173] Determine the output pressure of the first cold press corresponding to the operating side according to the current first thickness and the current rolling speed, and the preset first association relationship corresponding to the operating side; determine the output pressure of the second cold press corresponding to the transmission side according to the current second thickness and the current rolling speed, and the preset first association relationship corresponding to the transmission side;

[0174] According to the current first thickness and the current rolling speed, and the preset second association relationship corresponding to the operating side, the first cold press adjustment pressure corresponding to the operating side is determined; according to the current second thickness and the current rolling speed, and the preset second association relationship corresponding to the transmission side, the second cold press adjustment pressure corresponding to the transmission side is determined.

[0175] The control module 403 is specifically used to control the operating side of the cold press to output pressure according to the output pressure of the first cold press or the adjustment pressure of the first cold press; and control the transmission side of the cold press to output pressure according to the output pressure of the second cold press or the adjustment pressure of the second cold press.

[0176] In a feasible implementation of an embodiment of the present application, the first association relationship includes: the unit thickness adjustment pressure of the cold press required to be adjusted corresponding to the unit thickness change of the pole piece, and a second association sub-table between the rolling speed of the cold press and the cold press adjustment pressure; the cold press adjustment pressure includes: thickness adjustment pressure and speed adjustment pressure.

[0177] The determination module 402 is specifically used to determine whether the current thickness of the electrode after cold pressing meets the preset first pressure control condition, and to determine whether the current rolling speed of the cold press meets the preset second pressure control condition; when the current thickness of the electrode after cold pressing meets the preset first pressure control condition, the current thickness adjustment pressure is determined according to the difference between the current thickness of the electrode after cold pressing and the preset target thickness, and the unit thickness adjustment pressure; when the current rolling speed meets the preset second pressure control condition, the current speed adjustment pressure corresponding to the current rolling speed is determined according to the speed range in which the current rolling speed is located and the adjustment pressures corresponding to different speed ranges.

[0178] The control module 403 is specifically configured to control the cold press to output pressure according to the current thickness adjustment pressure and / or the current speed adjustment pressure, and the current actual output pressure of the cold press.

[0179] In the above-mentioned feasible implementation manner, the first pressure control condition is: the difference between the current thickness of the electrode obtained for n1 consecutive times and the preset target thickness is greater than the preset first thickness change threshold; or, the difference between the current thickness of the electrode obtained for n2 consecutive times and the preset target thickness is less than the preset second thickness change threshold; the n1 and the n2 are both positive integers greater than or equal to 1; the first thickness change threshold is greater than the second thickness change threshold.

[0180] In the above-mentioned feasible implementation manner, the second pressure control condition is: the current rolling speed change is greater than the preset first speed change threshold, or the current rolling speed change is less than the preset second speed change threshold; wherein: the current rolling speed change is the difference between the current rolling speed of the cold press and the previous rolling speed; the first speed change threshold is greater than the second speed change threshold.

[0181] In a feasible implementation of the embodiment of the present application, the first association relationship and the second association relationship are regression models with thickness, velocity and pressure as variable values.

[0182] In a feasible execution example of the above feasible implementation mode, the acquisition module 401 is further used to obtain the latest current thickness of the electrode after cold pressing and the latest current rolling speed of the cold press after the cold press is stopped and restarted;

[0183] The determining module 402 is further configured to determine, based on the latest current thickness and the latest current rolling speed, and the regression model before the shutdown and restart, the cold press output pressure or the cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed;

[0184] The control module 403 is further configured to control the pressure output of the cold compressor after it is shut down and restarted according to the output pressure of the cold compressor or the adjusted pressure of the cold compressor, so that the cold compressor can cold-press the electrode according to the output pressure of the cold compressor at the next moment.

[0185] In the above feasible execution example, the acquisition module 401 is also used to determine the cold press output pressure or cold press adjustment pressure corresponding to the current thickness and the current rolling speed based on the latest current thickness and the latest current rolling speed, as well as the regression model before shutdown and restart, and after controlling the pressure output of the cold press after shutdown and restart based on the cold press output pressure or the cold press adjustment pressure, re-acquire the latest current thickness of the electrode and the latest current rolling speed of the cold press under the latest output pressure value of the cold press;

[0186] The control module 403 is also used to update the model parameters of the regression model according to the latest current thickness reacquired, the latest current rolling speed reacquired, and the pressure value when the latest current thickness reacquired meets the preset reasonable thickness conditions and the latest current rolling speed reacquired meets the preset reasonable speed conditions.

[0187] It should be understood that, for the sake of brevity, some of the contents described in the first embodiment will not be repeated in this embodiment.

[0188] Example 4:

[0189] This embodiment provides an electronic device, see Figure 5 As shown, it includes a processor 501, a memory 502 and a communication bus 503.

[0190] The communication bus 503 is used to implement connection and communication between the processor 501 and the memory 502 .

[0191] The memory 502 stores program codes for implementing the request converter, process processor, and response converter in the middle layer provided by the embodiment of the present application.

[0192] The processor 501 is used to call the program code stored in the memory 502 to implement the cold press pressure control method in the above-mentioned embodiment 2.

[0193] I understand. Figure 5 The structure shown is only for illustration, and the electronic device may also include Figure 5 More or fewer components than shown, or with Figure 5 Different configurations shown.

[0194] It should also be noted that the electronic device provided in this embodiment can be the cold press itself, and can also be a PLC (Programmable Logic Controller) that can be installed in the cold press or can be connected to communicate with the cold press.

[0195] This embodiment further provides a computer-readable storage medium, such as a floppy disk, an optical disk, a hard disk, a flash memory, a USB flash drive, an SD (Secure Digital Memory Card), an MMC (Multimedia Card), etc., which stores one or more programs for implementing the above steps. These one or more programs can be executed by one or more processors to implement the cold press pressure control method of the above-mentioned embodiment 1 and / or embodiment 2. This description is omitted here.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no conflict in structure or execution order, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cold press pressure control method, characterized in that: include: Get the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment; According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, determining the cold press output pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press; Alternatively, based on the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset second correlation relationship, the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined; wherein the first correlation relationship is the correlation relationship between the electrode thickness, the rolling speed of the cold press, and the output pressure of the cold press; the second correlation relationship is the correlation relationship between the electrode thickness, the rolling speed of the cold press, and the cold press adjustment pressure; Controlling the cold press to output pressure according to the cold press output pressure or the cold press adjustment pressure, so that the cold press performs cold pressing on the electrode according to the cold press output pressure at the next moment; The first correlation relationship and the second correlation relationship are regression models with thickness, velocity and pressure as variable values.

2. The cold press pressure control method according to claim 1, characterized in that: According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, the output pressure of the cold press corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: Determining the current operating condition of the cold press according to the current rolling speed and the rolling speed at the previous moment; Determining, based on the current thickness and the current rolling speed, and a first correlation corresponding to the current working condition, an output pressure of the cold press corresponding to the current thickness of the electrode and the current rolling speed of the cold press; According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset second association relationship, determining the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, including: Determining the current operating condition of the cold press according to the current rolling speed and the rolling speed at the previous moment; According to the current thickness and the current rolling speed, and the second association relationship corresponding to the current working condition, the cold press adjustment pressure corresponding to the current thickness of the pole piece and the current rolling speed of the cold press is determined.

3. The cold press pressure control method according to claim 1, characterized in that: Get the current thickness of the electrode after cold pressing at the current moment, including: Obtaining a current first thickness of the pole piece on the operating side of the cold press and a current second thickness of the pole piece on the transmission side of the cold press; According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset first association relationship, the output pressure of the cold press corresponding to the current thickness of the electrode and the current rolling speed of the cold press is determined, including: Determining a first cold press output pressure corresponding to the operating side according to the current first thickness and the current rolling speed, and a preset first association relationship corresponding to the operating side; Determining the output pressure of the second cold press corresponding to the transmission side according to the current second thickness and the current rolling speed, and the preset first association relationship corresponding to the transmission side; According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset second association relationship, determining the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, including: Determining an adjustment pressure of a first cold press corresponding to the operating side according to the current first thickness and the current rolling speed, and a preset second association relationship corresponding to the operating side; Determining an adjustment pressure of a second cold press corresponding to the transmission side according to the current second thickness and the current rolling speed, and a preset second association relationship corresponding to the transmission side; Controlling the cold press to output pressure according to the output pressure of the cold press or the adjusted pressure of the cold press includes: controlling the operating side of the cold press to output pressure according to the output pressure of the first cold press or the adjusted pressure of the first cold press; The transmission side of the cold press is controlled to output pressure according to the output pressure of the second cold press or the adjusted pressure of the second cold press.

4. The cold press pressure control method according to any one of claims 1 to 3, characterized in that: The second association relationship includes: the unit thickness adjustment pressure of the cold press required to be adjusted when the electrode sheet undergoes a unit thickness change, and a second association sub-table between the rolling speed of the cold press and the cold press adjustment pressure; the cold press adjustment pressure includes: thickness adjustment pressure and speed adjustment pressure; According to the current thickness of the electrode after cold pressing and the current rolling speed of the cold press at the current moment, and a preset second association relationship, determining the cold press adjustment pressure corresponding to the current thickness of the electrode and the current rolling speed of the cold press, including: Determining whether the current thickness of the electrode after cold pressing satisfies a preset first pressure control condition, and determining whether the current rolling speed of the cold press satisfies a preset second pressure control condition; When the current thickness of the electrode after cold pressing meets a preset first pressure control condition, determining a current thickness adjustment pressure according to a difference between the current thickness of the electrode after cold pressing and a preset target thickness, and the unit thickness adjustment pressure; When the current rolling speed satisfies a preset second pressure control condition, the current speed adjustment pressure corresponding to the current rolling speed is determined according to the speed interval in which the current rolling speed is located and the adjustment pressures corresponding to different speed intervals; Correspondingly, adjusting the pressure of the cold press to control the cold press to output pressure includes: controlling the cold press to output pressure according to the current thickness adjustment pressure and / or the current speed adjustment pressure and the current actual output pressure of the cold press; If the current thickness of the electrode after cold pressing satisfies the first pressure control condition, but the current rolling speed does not satisfy the second pressure control condition, the determined current thickness adjustment pressure is used as the cold press adjustment pressure to control the cold press to output pressure; If the current thickness of the electrode after cold pressing does not meet the first pressure control condition, but the current rolling speed meets the second pressure control condition, the determined current speed adjustment pressure is used as the cold press adjustment pressure to control the cold press to output pressure; If the current thickness of the electrode after cold pressing satisfies the first pressure control condition, and the current rolling speed satisfies the second pressure control condition, the sum of the current thickness adjustment pressure and the speed adjustment pressure is used as the cold press adjustment pressure to control the cold press to output pressure; If the current thickness of the electrode after cold pressing does not meet the first pressure control condition, and the current rolling speed does not meet the second pressure control condition, no pressure adjustment is performed.

5. The cold press pressure control method according to claim 4, characterized in that: The first pressure control condition is: The difference between the current thickness of the electrode piece obtained for n1 consecutive times and the preset target thickness is greater than a preset first thickness change threshold; Or, the difference between the current thickness of the electrode piece obtained for n2 consecutive times and the preset target thickness is less than a preset second thickness change threshold; Both n1 and n2 are positive integers greater than or equal to 1; the first thickness change threshold is greater than the second thickness change threshold.

6. The cold press pressure control method according to claim 4, characterized in that: The second pressure control condition is: the current rolling speed change is greater than the preset first speed change threshold, or the current rolling speed change is less than the preset second speed change threshold; wherein: The current rolling speed change is the difference between the current rolling speed of the cold press and the previous rolling speed; the first speed change threshold is greater than the second speed change threshold.

7. The cold press pressure control method according to claim 1, characterized in that: After the cold press is shut down and restarted, the method further includes: Obtaining the latest current thickness of the electrode after cold pressing and the latest current rolling speed of the cold press; Determine the cold press output pressure or cold press adjustment pressure corresponding to the latest current thickness and the latest current rolling speed based on the latest current thickness and the latest current rolling speed, and the regression model before the shutdown and restart; The cold press outputs pressure according to the output pressure of the cold press or the pressure control of the cold press after shutdown and restart, so that the cold press can cold-press the electrode according to the output pressure of the cold press at the next moment.

8. The cold press pressure control method according to claim 7, characterized in that: After determining the cold press output pressure or the cold press adjustment pressure corresponding to the current thickness and the current rolling speed based on the latest current thickness and the latest current rolling speed, and the regression model before the shutdown and restart, and controlling the cold press after the shutdown and restart to output pressure based on the cold press output pressure or the cold press adjustment pressure, the method further includes: Re-acquiring the latest current thickness of the electrode and the latest current rolling speed of the cold press under the latest pressure value output by the cold press; When the latest current thickness reacquired meets the preset reasonable thickness conditions, and the latest current rolling speed reacquired meets the preset reasonable speed conditions, the model parameters of the regression model are updated according to the latest current thickness reacquired, the latest current rolling speed reacquired, and the pressure value.

9. An electronic device, characterized in that: include: processor, memory, and communication bus; The communication bus is used to realize the connection and communication between the processor and the memory; The processor is used to execute one or more programs stored in the memory to implement the cold press pressure control method according to any one of claims 1 to 8.

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