WO2023066093A1 - Control method and apparatus for roller press, and roller press - Google Patents

Abstract

The present application discloses a control method and apparatus for a roller press, and a roller press. The method comprises: by means of a Smith predictor, obtaining a first roller gap correction amount of a roller press under feedback delay; obtaining a second roll gap correction amount associated with a feedback thickness, the feedback thickness being the thickness of a battery electrode plate after being rolled by the roller press; on the basis of the first roller gap correction amount and the second roller gap correction amount, determining a total roller gap correction amount of the roller press; and adjusting a pressing roller gap of the roller press by means of the total roller gap correction amount. In the control method for a roller press of the embodiments of the present application, the roller gap correction amount of a roller press under a feedback delay may be obtained by means of a Smith predictor, the roller gap correction amount fed back by a thickness gauge is corrected, and the thickness fluctuation caused by feedback lag is reduced, thereby reducing the deviation of the rolling thickness of a roller press, and thus improving the yield rate in battery production.

Description

[Title of the invention made by ISA under Rule 37.2] A method and device for controlling a rolling machine, and a rolling machine

Cross References to Related Applications

This application claims the priority of Chinese patent application 202111222058.7 entitled "Roller Press Control Method, Device and Roller Press", filed on October 20, 2021, the entire content of which is incorporated herein by reference.

technical field

The present application relates to the technical field of batteries, in particular to a control method and device for a rolling machine and the rolling machine.

Background technique

With the rapid development of battery technology, the application of batteries (such as lithium batteries, etc.) is becoming more and more popular. As one of the basic components of the battery, the battery pole piece has a great impact on the performance of the battery, such as its energy density, capacity and service life. Among them, rolling is one of the important links in the production of battery pole pieces. Its purpose is to make the combination of battery active material and foil more firm and dense, and then obtain battery pole pieces with uniform thickness.

However, at present, during the rolling process of the battery pole piece, the rolling thickness of the rolling machine may deviate, resulting in abnormal thickness of the battery pole piece after rolling, resulting in defects such as dislocation of tabs, thereby reducing the cost of battery production. Yield rate.

Contents of the invention

The purpose of the embodiments of the present application is to provide a control method, device and rolling machine for a rolling machine, which can solve the current problem of low yield rate in battery production due to deviations in rolling thickness.

In the first aspect, the embodiment of the present application provides a method for controlling a roller press, including:

Obtaining the first roll gap correction amount of the roller press under feedback delay through the smith predictor;

Acquiring a second roll gap correction value associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a roller press;

determining a total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount;

The reduction roll gap of the rolling press is adjusted by the total roll gap correction amount.

In the embodiment of the present application, the first roll gap correction amount of the rolling press under feedback delay and the second roll gap correction amount fed back by the thickness gauge at the exit of the rolling press are obtained through the smith predictor; then, Based on the first roll gap correction amount and the second roll gap correction amount, the total roll gap correction amount of the rolling press is determined; finally, the pressing roll gap of the rolling press machine is adjusted through the total roll gap correction amount. In this way, the roll gap correction amount of the roller press under feedback delay can be obtained through the smith predictor, and the roll gap correction amount fed back by the thickness gauge can be corrected to reduce the thickness fluctuation caused by the feedback hysteresis, thereby reducing the roll gap correction amount of the roll press machine. There is a deviation in the rolling thickness, thereby improving the yield rate in battery production.

In some embodiments, the obtaining the first roll gap correction amount of the roller press under feedback delay through the smith estimator includes:

Obtaining a first thickness deviation based on the total roll gap correction amount in the last control cycle;

Calculate a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;

The third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount of the rolling machine under feedback delay.

In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control cycle, and the third thickness is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge, and the time delay. Deviation, and the third thickness deviation is input into the integral feedback closed loop to obtain the above-mentioned first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some embodiments, the obtaining the first thickness deviation based on the total roll gap correction amount in the last control cycle includes:

Acquiring the first pressure deviation and stiffness coefficient of the roller press, and obtaining the total roll gap correction amount in the last control cycle;

Calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the last control cycle as the first thickness deviation.

In this embodiment, the sum of the ratio of the first pressure deviation and the stiffness coefficient of the roller press to the total roll gap correction amount in the previous control cycle is determined as the first thickness deviation, so that when calculating the first The thickness deviation caused by the deformation of the roller press is considered in the thickness deviation, so that the calculated first thickness deviation is more reasonable, and the control accuracy of the roller press is further improved.

In some embodiments, before obtaining the pressure deviation and stiffness coefficient of the roller press, the method further includes:

When the roller press is in an offline test state, at least one set of sampling data of the roller press is acquired, wherein each of the sampling data includes a preset roll gap correction amount, and the preset roll gap correction Quantitatively adjust the second pressure deviation when the roll gap of the roller press is pressed down;

A stiffness coefficient of the roller press is updated based on the at least one set of sampled data.

In this embodiment, the stiffness coefficient of the roller press is updated according to at least one set of sampling data of the acquired roller press, so that the stiffness coefficient of the roller press can be updated in time to avoid the Changes in the stiffness coefficient after replacement or maintenance affect the generation of the first thickness deviation and further improve the accuracy of the first thickness deviation.

In some embodiments, said inputting said third thickness deviation into an integral feedback closed loop comprises:

inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop;

The acquisition of the second roll gap correction value associated with the feedback thickness includes:

Inputting the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount;

Wherein, the total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount.

In this embodiment, by inputting the product of the third thickness deviation, the second thickness deviation and their corresponding weights into the closed feedback loop, the first roll gap correction amount and the second roll gap correction amount are respectively obtained, and The sum of the first roll gap correction amount and the second roll gap correction amount is used as the total roll gap correction amount, so that the calculated total roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some embodiments, the inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop includes:

Obtaining the stiffness coefficient and the plasticity coefficient of the roller press, and calculating the elastic index value of the roller press based on the stiffness coefficient and the plasticity coefficient;

The product of the elasticity index value, the first weight and the third thickness deviation is input into an integral feedback closed loop.

In this embodiment, in the calculation of the above-mentioned first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the rolling machine are also used as input quantities for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount Quantity is more accurate.

In the second aspect, the embodiment of the present application also provides a control device for a roller press, including:

The first correction amount acquisition module is used to obtain the first roll gap correction amount of the roller press under feedback delay through the smith estimator;

The second correction amount acquisition module is configured to acquire a second roll gap correction amount associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a rolling press;

A total correction amount acquisition module, configured to determine the total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount;

An adjustment module, configured to adjust the pressing roll gap of the rolling machine through the total roll gap correction amount.

In the embodiment of the present application, the first roll gap correction amount of the rolling press under feedback delay and the second roll gap correction amount fed back by the thickness gauge at the exit of the rolling press are obtained through the smith predictor; then, Based on the first roll gap correction amount and the second roll gap correction amount, the total roll gap correction amount of the rolling press is determined; finally, the pressing roll gap of the rolling press machine is adjusted through the total roll gap correction amount. In this way, the roll gap correction amount of the roller press under feedback delay can be obtained through the smith predictor, and the roll gap correction amount fed back by the thickness gauge can be corrected to reduce the thickness fluctuation caused by the feedback hysteresis, thereby reducing the roll gap correction amount of the roll press machine. There is a deviation in the rolling thickness, thereby improving the yield rate in battery production.

In some implementations, the first correction amount acquisition module includes:

a first thickness deviation acquisition unit, configured to acquire a first thickness deviation based on the total roll gap correction amount in the previous control cycle;

The third thickness deviation acquisition unit is configured to calculate and obtain a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is the difference between the feedback thickness and the preset The deviation value obtained by comparing the thickness;

The first correction amount acquisition unit is configured to input the third thickness deviation into the integral feedback closed loop to obtain the first roll gap correction amount of the roller press under feedback delay.

In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control cycle, and the third thickness is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge, and the time delay. Deviation, and the third thickness deviation is input into the integral feedback closed loop to obtain the above-mentioned first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some embodiments, the first thickness deviation acquisition unit includes:

The input amount acquisition subunit is used to acquire the first pressure deviation and stiffness coefficient of the roller press, and acquire the total roll gap correction amount in the last control cycle;

The first thickness deviation calculation subunit is used to calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the previous control cycle as the first thickness deviation.

In this embodiment, the sum of the ratio of the first pressure deviation and the stiffness coefficient of the roller press to the total roll gap correction amount in the previous control cycle is determined as the first thickness deviation, so that when calculating the first The thickness deviation caused by the deformation of the roller press is considered in the thickness deviation, so that the calculated first thickness deviation is more reasonable, and the control accuracy of the roller press is further improved.

In some embodiments, the device also includes:

A sampling data acquisition module, configured to acquire at least one set of sampling data of the rolling machine when the rolling machine is in an offline test state, wherein each of the sampling data includes a preset roll gap correction amount, and by The preset roll gap correction amount adjusts the second pressure deviation of the roller press when pressing the roll gap;

A stiffness coefficient updating module, configured to update the stiffness coefficient of the roller press based on the at least one set of sampling data.

In this embodiment, the stiffness coefficient of the roller press is updated according to at least one set of sampling data of the acquired roller press, so that the stiffness coefficient of the roller press can be updated in time to avoid the Changes in the stiffness coefficient after replacement or maintenance affect the generation of the first thickness deviation and further improve the accuracy of the first thickness deviation.

In some implementation manners, the first correction amount acquisition unit is specifically configured to:

inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop;

The second correction amount acquisition module is specifically used for:

Inputting the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount;

Wherein, the total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount.

In this embodiment, by inputting the product of the third thickness deviation, the second thickness deviation and their corresponding weights into the closed feedback loop, the first roll gap correction amount and the second roll gap correction amount are respectively obtained, and The sum of the first roll gap correction amount and the second roll gap correction amount is used as the total roll gap correction amount, so that the calculated total roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some implementations, the first correction amount acquisition unit includes:

an elastic index value calculation subunit, configured to obtain the stiffness coefficient and the plastic coefficient of the roller press, and calculate the elastic index value of the roller press based on the stiffness coefficient and the plastic coefficient;

The first correction amount acquisition subunit is configured to input the product of the elasticity index value, the first weight and the third thickness deviation into the integral feedback closed loop.

In this embodiment, in the calculation of the above-mentioned first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the rolling machine are also used as input quantities for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount Quantity is more accurate.

In a third aspect, an embodiment of the present application provides a rolling machine, which includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor, the program or When the instructions are executed by the processor, the steps of the method described in the first aspect are realized.

In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented .

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the application. Also, the same reference numerals are used to denote the same components throughout the drawings. In the attached picture:

Fig. 1 is one of the schematic diagrams of the control process of the rolling machine of some embodiments of the present application;

Fig. 2 is a schematic flow chart of a control method of a roller press in some embodiments of the present application;

Fig. 3 is the second schematic diagram of the control process of the rolling machine in some embodiments of the present application;

FIG. 4 is a schematic diagram of the acquisition process of sampling data in some embodiments of the present application;

Fig. 5 is a structural schematic diagram of a control device of a roller press in some embodiments of the present application;

Fig. 6 is a schematic diagram of a hardware structure of a rolling machine according to some embodiments of the present application.

Detailed ways

Embodiments of the technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples, rather than limiting the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the application; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to To limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the description of the above drawings are intended to cover a non-exclusive inclusion.

In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and should not be understood as indicating or implying relative importance or implicitly indicating the number, specificity, or specificity of the indicated technical features. Sequence or primary-secondary relationship. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

At present, during the rolling process of battery pole pieces, the control system of the rolling machine usually adopts feedback automatic gain control (Automatic Gain Control, AGC) (also known as "monitoring AGC") to eliminate the changes in the hardness of the material, pressing Exit thickness deviation due to factors such as condition changes and thermal expansion of the pressing roller. As shown in Figure 1, in the control system of the roller press, a thickness gauge (such as a laser thickness gauge, etc.) is installed at the exit of the output electrode pole piece of the roller press, and the thickness of the battery pole piece at the exit is measured by the thickness gauge. The thickness deviation Δh between the thickness and the target value, according to the above thickness deviation Δh and formula (1), calculate the reduction position correction amount ΔSFB, and adjust the reduction roll gap of the roller press through ΔSFB. Among them, the feedback AGC control is integral control.

In the formula (1), KFB represents the gain coefficient related to the relative thickness difference percentage value measured by the thickness gauge behind the roller press;

M represents the material constant of the roller press;

K represents the stiffness coefficient of the roller press.

However, since the deviation is measured after the roll gap, short-term deviations are not corrected by feedback control. The actual value measured is determined by the thickness measurement time and the additional velocity lag time. The shorter the distance between the roll gap and thickness measurement, the better the quality of the feedback measurement control loop. In this way, the feedback lag in the adjustment process will cause thickness fluctuations, so that the rolling thickness of the rolling machine will deviate, thereby reducing the yield rate in battery production.

In order to reduce the thickness fluctuation caused by the feedback lag in the adjustment process, to reduce the deviation of the rolling thickness of the rolling machine, and to improve the yield rate in battery production, the application proposes a method for controlling the rolling machine.

The method for controlling the rolling machine provided by the embodiment of the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

Please refer to FIG. 2 , an embodiment of the present application provides a method for controlling a rolling machine, which is applied to a rolling machine. As shown in FIG. 2 , the above method may include steps 201 to 204 as follows.

Step 201, using the smith estimator to obtain the first roll gap correction amount of the rolling machine under feedback delay.

Step 202. Obtain a second roll gap correction value associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a roller press.

Step 203, based on the first roll gap correction amount and the second roll gap correction amount, determine the total roll gap correction amount of the rolling press.

Step 204, adjust the pressing roll gap of the rolling machine according to the total roll gap correction amount.

In the above step 201, during the rolling process of the battery pole piece by the rolling machine, the control system of the rolling machine can obtain the first roll gap correction amount of the rolling machine under feedback delay through the smith predictor.

Among them, the above-mentioned smith estimator is used to obtain the first roll gap correction amount of the roller press under feedback delay, which may be to estimate the thickness model in the controlled process in advance, and connect the smith estimator to the controlled process in parallel , make it compensate the thickness deviation fed back by the thickness gauge under the feedback delay time, obtain the thickness deviation compensation amount under the feedback delay time, and obtain the above-mentioned first roll gap correction amount according to the thickness deviation compensation amount.

Specifically, the thickness deviation can be obtained through the above thickness model, and the thickness deviation can be calculated based on the roll gap correction amount determined in N historical control cycles, and the N can be an integer greater than 1, for example, it can be the first 10 The average value of the total roll gap correction determined in the control cycle is determined as the above-mentioned thickness deviation, etc.; then the calculated thickness deviation is tracked to the thickness gauge, and according to the calculated thickness deviation, the thickness deviation fed back by the thickness gauge and the time In the extension part, the thickness deviation compensation amount under the feedback delay time is calculated, and finally the thickness deviation compensation amount under the feedback delay time is introduced into the integral feedback closed loop to obtain the above-mentioned first roll gap correction amount.

In the above step 202, during the rolling process of the battery pole piece by the rolling machine, the thickness gauge installed at the exit of the rolling machine can measure the thickness of the rolled battery pole piece, and the measured The thickness is used as the feedback thickness feedback value to the control system of the rolling machine, and the control system of the rolling machine can determine the second roll gap correction value associated with the feedback thickness according to the feedback thickness.

Wherein, the above-mentioned determination of the second roll gap correction amount associated with the feedback thickness according to the feedback thickness may be that the roller press control system compares the feedback thickness with the preset thickness to obtain the thickness deviation of the feedback thickness, and calculate the thickness deviation of the feedback thickness Introduced into the integral feedback closed loop to obtain the above-mentioned second roll gap correction amount.

It should be noted that the execution order of the above step 201 and the above step 202 may be in no particular order, that is, step 201 may be executed before step 202, or step 201 may be executed after step 202, or step 201 may also be executed It is executed simultaneously with step 202, and FIG. 2 of the embodiment of the present application only shows the situation that step 201 is executed before step 202, which is not limited here.

In the above step 203, after the above-mentioned rolling machine obtains the above-mentioned first roll gap correction amount and the second roll gap correction amount, the rolling machine can determine based on the above-mentioned first roll gap correction amount and the second roll gap correction amount The total roll gap correction of the roller press.

Wherein, the above-mentioned determination of the total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount may be the sum of the first roll gap correction amount and the second roll gap correction amount as The above total roll gap correction.

Alternatively, the weight of the first roll gap correction amount and the weight of the second roll gap correction amount can also be pre-configured in the roller press, and the above-mentioned weights of the first roll gap correction amount and the second roll gap correction amount are used to determine the weight of the roll press machine. The total roll gap correction amount can be calculated by calculating the product of the first roll gap correction amount and its weight, the product of the second roll gap correction amount and its weight, and determining the sum of the two products as the above-mentioned total roll gap correction amount.

In the above step 204, after the above-mentioned roller press determines the above-mentioned total roll gap correction amount, the control system of the roller press machine can input the total roll gap correction amount into the pressure system of the roller press machine to adjust the pressure of the pressure system , to realize the adjustment of the reduction roll gap of the roller press through the total roll gap correction amount.

In the embodiment of the present application, the first roll gap correction amount of the rolling press under feedback delay and the second roll gap correction amount fed back by the thickness gauge at the exit of the rolling press are obtained through the smith predictor; then, Based on the first roll gap correction amount and the second roll gap correction amount, the total roll gap correction amount of the rolling press is determined; finally, the pressing roll gap of the rolling press machine is adjusted through the total roll gap correction amount. In this way, the roll gap correction amount of the roller press under feedback delay can be obtained through the smith predictor, and the roll gap correction amount fed back by the thickness gauge can be corrected to reduce the thickness fluctuation caused by the feedback hysteresis, thereby reducing the roll gap correction amount of the roll press machine. There is a deviation in the rolling thickness, thereby improving the yield rate in battery production.

In some embodiments, the above step 201 may include: obtaining the first thickness deviation based on the total roll gap correction amount in the last control cycle; Three thickness deviations, where the second thickness deviation is the deviation value obtained by comparing the feedback thickness with the preset thickness; input the third thickness deviation into the integral feedback closed loop to obtain the first roll gap correction of the roller press under feedback delay quantity.

Wherein, the above-mentioned acquisition of the first thickness deviation based on the total roll gap correction amount in the last control cycle may be directly using the above-mentioned total roll gap correction amount as the above-mentioned first thickness deviation, or may also be the combination of the total roll gap correction amount and The product of the preset coefficients is determined as the above-mentioned first thickness deviation, and so on.

In addition, the third thickness deviation calculated based on the first thickness deviation, the second thickness deviation and the time delay part may be calculated by the following formula (2).

h _ε =Δh+Δh ₁ -e ^-TS ·Δh ₁ (2)

In the formula (2), the above Δh represents the second thickness deviation;

The above Δh ₁ represents the first thickness deviation;

The above e ^-TS represents the time delay part;

The above-mentioned Δh _ε represents the third thickness deviation.

It should be noted that the above-mentioned input of the third thickness deviation into the integral feedback closed loop to obtain the first roll gap correction amount of the roller press under feedback delay may be directly inputting the third thickness deviation into the integral feedback closed loop.

In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control cycle, and the third thickness is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge, and the time delay. Deviation, and the third thickness deviation is input into the integral feedback closed loop to obtain the above-mentioned first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some embodiments, the above-mentioned acquisition of the first thickness deviation based on the total roll gap correction amount in the previous control cycle may include: obtaining the first pressure deviation and stiffness coefficient of the roller press, and obtaining the first thickness deviation in the previous control cycle The total roll gap correction amount; calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the previous control cycle as the first thickness deviation.

Wherein, the above calculation of the first thickness deviation can be realized by the following formula (3):

ΔP represents the first pressure deviation of the roller press in the current control cycle;

K represents the stiffness coefficient of the roller of the roller press;

ΔS _t-1 represents the total roll gap correction in the last control cycle;

Δh ₁ represents the above-mentioned first thickness deviation.

In addition, the above-mentioned first pressure deviation is the amount of pressure change when the pressure system of the roller press controls the pressing down of the rollers.

It should be noted that the aforementioned stiffness coefficient may be a preset value in the rolling machine, and the preset value is fixed.

In this embodiment, the sum of the ratio of the first pressure deviation and the stiffness coefficient of the roller press to the total roll gap correction amount in the previous control cycle is determined as the first thickness deviation, so that when calculating the first The thickness deviation caused by the deformation of the roller press is considered in the thickness deviation, so that the calculated first thickness deviation is more reasonable, and the control accuracy of the roller press is further improved.

In some embodiments, before acquiring the pressure deviation and stiffness coefficient of the roller press, the method may further include: acquiring at least one set of sampling data of the roller press when the roller press is in an offline test state, wherein each sampling The data includes a preset roll gap correction amount, and a second pressure deviation when adjusting the roll gap of the roller press through the preset roll gap correction amount; based on at least one set of sampling data, the stiffness coefficient of the roller press is updated.

Wherein, each group of sampling data in the above at least one set of sampling data is measured when the roller press is in an offline test state, which can be when the roller press is started, when the rolling gap of the roller press is adjusted The variation is the preset roll gap correction amount, and the second pressure deviation of the roller press under the preset roll gap correction amount is obtained, so as to obtain sampling data including the preset roll gap correction amount and the second pressure deviation.

It should be noted that, in order to ensure the accuracy of the above sampling data, at least one of the following items may be satisfied in the above process of obtaining the sampling data:

The roller press has no bending force;

The test speed of the main motor of the roller press is fixed;

Every time the roller rotates once, the average value of the pressure deviations at multiple positions during the rotation process is taken as the above-mentioned second pressure deviation, so as to eliminate the influence of the eccentricity of the roller on the measurement data, and so on.

In addition, the aforementioned update of the stiffness coefficient of the roller press based on at least one set of sampling data may be to calculate a stiffness coefficient based on each set of sampling data, and then obtain at least one stiffness coefficient, and take the average value of the at least one stiffness coefficient as The coefficient of stiffness of the above roller press. The calculation of the above-mentioned stiffness coefficient based on the sampling data may be realized by the following formula (4).

The above ΔS ₀ represents the preset roll gap correction amount in the sampling data;

The above ΔP represents the second pressure deviation in the sampling data;

The above K represents the stiffness coefficient of the roller press calculated through sampling data.

In this embodiment, the stiffness coefficient of the roller press is updated according to at least one set of sampling data of the acquired roller press, so that the stiffness coefficient of the roller press can be updated in time to avoid the Changes in the stiffness coefficient after replacement or maintenance affect the generation of the first thickness deviation and further improve the accuracy of the first thickness deviation.

In some implementations, the aforementioned inputting the third thickness deviation into the integral feedback closed loop may include: inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop. Obtaining the second roll gap correction amount associated with the feedback thickness may include: inputting the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount. The total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount.

Wherein, the above-mentioned first weight and the above-mentioned second weight may be values preset in the above-mentioned rolling machine, and the sum of the above-mentioned first weight and the second weight is 1.

In addition, the above-mentioned input of the product of the third thickness deviation and the first weight into the integral feedback closed loop may be directly inputting the product of the third thickness deviation used for the first weight into the integral feedback closed loop, that is, through the following formula (5) .

In the above formula (5),

denotes the first weight; and h _ε denotes the first roll gap correction amount.

Similarly, the above-mentioned input of the product of the second thickness deviation associated with the feedback thickness and the second weight to the integral feedback closed loop to obtain the second roll gap correction amount can be realized through the following formula (6).

In the above formula (6),

represents the second weight; and Δh represents the first roll gap correction amount.

The above-mentioned total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount, which can be calculated by the following formula (7).

ΔS _t =ΔS1+ΔS2 (7)

In this embodiment, by inputting the product of the third thickness deviation, the second thickness deviation and their corresponding weights into the closed feedback loop, the first roll gap correction amount and the second roll gap correction amount are respectively obtained, and The sum of the first roll gap correction amount and the second roll gap correction amount is used as the total roll gap correction amount, so that the calculated total roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some embodiments, the product of the third thickness deviation and the first weight is input into an integral feedback closed loop comprising:

Obtain the stiffness coefficient and plasticity coefficient of the roller press, and calculate the elastic index value of the roller press based on the stiffness coefficient and plasticity coefficient;

The product of the elasticity index value, the first weight and the third thickness deviation is input into the integral feedback closed loop.

Wherein, the calculation of the elastic index value of the rolling machine based on the stiffness coefficient and the above plastic coefficient can be obtained through the following formula (8).

E＝K+M(1-α)/K (8)

In the above formula (8), E represents the elastic index value, K represents the stiffness coefficient, M represents the plastic coefficient, and α is a preset value from 0 to 1.

In this way, the aforementioned input of the product of the elasticity index value, the first weight and the third thickness deviation into the integral feedback closed loop may be calculated by the following formula (9).

In this embodiment, in the calculation of the above-mentioned first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the rolling machine are also used as input quantities for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount Quantity is more accurate.

It should be noted that the rolling machine in the embodiment of the present application may be, but not limited to, a rolling machine for rolling battery electrode sheets.

In order to better understand the control method of the rolling machine provided in the embodiment of the present application, an example of the above-mentioned control method of the rolling machine in practical application is provided here for description, as follows:

As shown in Figure 3, the calculated thickness deviates from the real thickness due to load disturbance or inaccurate bouncing equations. In order to compensate for the deviation, the first thickness deviation can be calculated through the thickness calculation model, see the above formula (3). Use the rotary position encoder on the motor (referred to as "SE") to track the first thickness deviation to the thickness tracking table, and compare the second thickness deviation obtained according to the thickness detected by the thickness gauge to obtain the third thickness deviation, see the formula (3). Through the Smith estimation strategy, the third thickness deviation is introduced into the integral feedback closed loop to obtain the first roll gap correction amount ΔS1, see formula (9). In order to eliminate the system deviation generated by the thickness gauge sensor and the Smith algorithm itself and improve the thickness accuracy, the second thickness deviation is introduced into the integral feedback closed loop to generate the second roll gap correction ΔS2, see formula (6). Calculate the sum of the first roll gap correction amount ΔS1 and the second roll gap correction amount ΔS2 to obtain ΔS, see formula (7), and adjust the reduction roll gap of the roller press through ΔS.

In addition, when the roller press is in an offline testing state, M sampling data (that is, at least one of the above sampling data) can be collected to calculate the stiffness coefficient of the roller press, and M is a positive integer. As shown in FIG. 4 , the process of acquiring M pieces of sample data may specifically include steps 401 to 413 as follows.

Step 401, the roller press receives an operation for instructing to start the stiffness measurement of the roller press.

Step 402 , the roller press performs stiffness measurement initialization of the roller press in response to the received operation.

Step 403, the roller press opens the roll gap to the unloading position.

Step 404, the position control mode of the roller press activates the combining rollers.

Step 405, the rolling force control mode of the rolling press is activated, and the roll gap is closed to reach the minimum pressure.

Step 406, the roller press controls its roller motor to start.

Step 407 , when the roller press detects that the roller speed is greater than zero, the roller press controls its position vacancy mode to activate, and closes the roll gap to reach the starting position of the stiffness measurement.

Step 408 , at the starting position of the stiffness measurement, the roller press measures the pressure deviation several times, and calculates the average value.

Step 409 , the roller press judges whether M different average values have been obtained, if not, execute step 410 ; if yes, execute step 411 .

Step 410 , the rolling machine increases the preset roll gap correction amount, and re-executes step 407 .

Step 411, the roller press opens the roll gap to the minimum pressure.

Step 412, the roller press controls the rollers to stop rotating.

Step 413, the roller press controls the roll gap to open to a fixed value.

Among them, each of the above M different average values and the preset roll gap correction amount constitute a sampling data, and M sampling data are obtained

The control device of the rolling machine according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 5 is a schematic structural diagram of a control device for a rolling machine provided in an embodiment of the present application. As shown in FIG. 5 , the control device 500 of the rolling machine includes a first correction amount acquisition module 501 , a second correction amount acquisition module 502 , a total correction amount acquisition module 503 and an adjustment module 504 .

The first correction amount acquisition module 501 is used to acquire the first roll gap correction amount of the roller press under feedback delay through the smith estimator.

The second correction amount acquisition module 502 is configured to acquire a second roll gap correction amount associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a roller press.

The total correction amount acquisition module 503 is used to determine the total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount.

The adjustment module 504 is used to adjust the rolling gap of the rolling machine through the total roll gap correction amount.

In the embodiment of the present application, the first roll gap correction amount of the rolling press under feedback delay and the second roll gap correction amount fed back by the thickness gauge at the exit of the rolling press are obtained through the smith predictor; then, Based on the first roll gap correction amount and the second roll gap correction amount, the total roll gap correction amount of the rolling press is determined; finally, the pressing roll gap of the rolling press machine is adjusted through the total roll gap correction amount. In this way, the roll gap correction amount of the roller press under feedback delay can be obtained through the smith predictor, and the roll gap correction amount fed back by the thickness gauge can be corrected to reduce the thickness fluctuation caused by the feedback hysteresis, thereby reducing the roll gap correction amount of the roll press machine. There is a deviation in the rolling thickness, thereby improving the yield rate in battery production.

In some implementations, the first correction amount acquisition module 501 may include a first thickness deviation acquisition unit, a third thickness deviation acquisition unit, and a first correction amount acquisition unit.

The first thickness deviation acquisition unit is configured to acquire the first thickness deviation based on the total roll gap correction amount in the last control cycle.

The third thickness deviation acquisition unit is used to calculate and obtain the third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with the preset thickness .

The first correction amount acquisition unit is used to input the third thickness deviation into the integral feedback closed loop to obtain the first roll gap correction amount of the roller press under feedback delay.

In this embodiment, the first thickness deviation is obtained based on the total roll gap correction amount of the previous control cycle, and the third thickness is calculated based on the first thickness deviation, the second thickness deviation associated with the thickness gauge, and the time delay. Deviation, and the third thickness deviation is input into the integral feedback closed loop to obtain the above-mentioned first roll gap correction amount, so that the obtained first roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some implementations, the first thickness deviation acquisition unit may include a first correction amount acquisition unit and a first thickness deviation calculation subunit.

The input amount acquisition subunit is used to acquire the first pressure deviation and stiffness coefficient of the roller press, and acquire the total roll gap correction amount in the last control cycle;

The first thickness deviation calculation subunit is used to calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the last control cycle as the first thickness deviation.

In this embodiment, the sum of the ratio of the first pressure deviation and the stiffness coefficient of the roller press to the total roll gap correction amount in the previous control cycle is determined as the first thickness deviation, so that when calculating the first The thickness deviation caused by the deformation of the roller press is considered in the thickness deviation, so that the calculated first thickness deviation is more reasonable, and the control accuracy of the roller press is further improved.

In some implementations, the device 500 may further include a sampling data acquisition module and a stiffness coefficient update module.

The sampling data acquisition module is used to obtain at least one set of sampling data of the rolling press when the rolling press is in an offline test state, wherein each sampling data includes a preset roll gap correction amount, and the preset roll gap correction amount is adjusted The second pressure deviation when the roller press presses down the roll gap.

The stiffness coefficient updating module is used for updating the stiffness coefficient of the roller press based on at least one set of sampling data.

In this embodiment, the stiffness coefficient of the roller press is updated according to at least one set of sampling data of the acquired roller press, so that the stiffness coefficient of the roller press can be updated in time to avoid the Changes in the stiffness coefficient after replacement or maintenance affect the generation of the first thickness deviation and further improve the accuracy of the first thickness deviation.

In some implementations, the first correction amount acquisition unit may specifically be configured to: input the product of the third thickness deviation and the first weight into the integral feedback closed loop.

The second correction amount acquisition module can be specifically configured to: input the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount.

Wherein, the total roll gap correction amount may be the sum of the first roll gap correction amount and the second roll gap correction amount.

In this embodiment, by inputting the product of the third thickness deviation, the second thickness deviation and their corresponding weights into the closed feedback loop, the first roll gap correction amount and the second roll gap correction amount are respectively obtained, and The sum of the first roll gap correction amount and the second roll gap correction amount is used as the total roll gap correction amount, so that the calculated total roll gap correction amount is more accurate, and the control accuracy of the rolling press is further improved.

In some implementations, the first correction amount acquisition unit may include an elasticity index value calculation subunit and an elasticity index value calculation subunit.

The elastic index value calculation subunit is used to obtain the stiffness coefficient and the plastic coefficient of the roller press, and calculate the elastic index value of the roller press based on the stiffness coefficient and the plastic coefficient.

The first correction amount acquisition subunit is used to input the product of the elastic index value, the first weight and the third thickness deviation into the integral feedback closed loop.

In this embodiment, in the calculation of the above-mentioned first roll gap correction amount, the stiffness coefficient and the shaping coefficient of the rolling machine are also used as input quantities for calculating the first roll gap correction amount, so that the calculated first roll gap correction amount Quantity is more accurate.

Other details of the control device of the roller press according to the embodiment of the present application are similar to the control method of the roller press described above in conjunction with the examples shown in Figures 2 to 4, and can achieve the corresponding technical effects. This will not be repeated here.

FIG. 6 shows a schematic diagram of the hardware structure of the rolling machine provided by the embodiment of the present application.

The roller press may include a processor 601 and a memory 602 storing computer program instructions.

Specifically, the above-mentioned processor 601 may include a central processing unit (Central Processing Unit, CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application .

Memory 602 may include mass storage for data or instructions. By way of example and not limitation, memory 602 may include a hard disk drive (Hard Disk Drive, HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a Universal Serial Bus (Universal Serial Bus, USB) drive or two or more Combinations of multiple of the above. In some examples, memory 602 may include removable or non-removable (or fixed) media, or memory 602 may be a non-volatile solid-state memory. In some embodiments, memory 602 may be internal or external to the battery device.

In some examples, the memory 602 may be a read only memory (Read Only Memory, ROM). In one example, the ROM can be mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or both. A combination of one or more of the above.

Memory 602 may include read only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions, and when the software is executed (e.g., by one or multiple processors) operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

The processor 601 reads and executes the computer program instructions stored in the memory 602 to implement the method in the embodiment shown in Figures 2 to 4, and achieve the corresponding technical effect achieved by executing the method/step in the example shown in Figures 2 to 4 , which will not be repeated here for brevity.

In one example, the roller press may also include a communication interface 603 and a bus 604 . Wherein, as shown in FIG. 6 , a processor 601 , a memory 602 , and a communication interface 603 are connected through a bus 604 to complete mutual communication.

The communication interface 603 is mainly used to implement communication between modules, devices, units and/or devices in the embodiments of the present application.

The bus 604 includes hardware, software or both, and couples the components of the online data traffic charging device to each other. By way of example and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Super Transmission (Hyper Transport, HT) interconnect, Industry Standard Architecture (Industry Standard Architecture, ISA) bus, InfiniBand interconnect, Low Pin Count (LPC) bus, memory bus, Micro Channel Architecture (MCA) bus, peripheral component interconnect PCI bus, PCI-Express (PCI-X) bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus, or other suitable bus or a combination of two or more of these combination. Bus 604 may comprise one or more buses, where appropriate. Although the embodiments of this application describe and illustrate a particular bus, this application contemplates any suitable bus or interconnect.

The rolling machine can execute the control method of the rolling machine in the embodiment of the present application, so as to realize the control method and the device of the rolling machine described in conjunction with FIG. 2 to FIG. 5 .

In addition, in combination with the method for controlling the rolling machine and the device thereof in the foregoing embodiments, the embodiments of the present application may provide a computer storage medium for implementation. Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by a processor, any battery and control method thereof in the above-mentioned embodiments can be realized.

It is to be understood that the application is not limited to the specific configurations and processes described above and shown in the figures. For conciseness, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art may make various changes, modifications and additions, or change the order of the steps after understanding the spirit of the present application.

The functional blocks shown in the above structural block diagrams may be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), appropriate firmware, a plug-in, a function card, and the like. When implemented in software, the elements of the present application are the programs or code segments employed to perform the required tasks. Programs or code segments can be stored in machine-readable media, or transmitted over transmission media or communication links by data signals carried in carrier waves. "Machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, etc. wait. Code segments may be downloaded via a computer network such as the Internet, an Intranet, or the like.

It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiment, or may be different from the order in the embodiment, or several steps may be performed simultaneously.

Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatuses, devices, and computer program products according to embodiments of the present disclosure. It will be understood that each block of the flowchart and/or block diagrams, and combinations of blocks in the flowchart and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine such that execution of these instructions via the processor of the computer or other programmable data processing apparatus enables Implementation of the functions/actions specified in one or more blocks of the flowchart and/or block diagrams. Such processors may be, but are not limited to, general purpose processors, special purpose processors, application specific processors, or field programmable logic circuits. It can also be understood that each block in the block diagrams and/or flowcharts and combinations of blocks in the block diagrams and/or flowcharts can also be realized by dedicated hardware for performing specified functions or actions, or can be implemented by dedicated hardware and Combination of computer instructions to achieve.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. All of them should be covered by the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (14)

1. A control method for a roller press, comprising:

   Obtaining the first roll gap correction amount of the roller press under feedback delay through the smith predictor;

   Acquiring a second roll gap correction value associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a roller press;

   determining a total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount;

   The reduction roll gap of the rolling press is adjusted by the total roll gap correction amount.
2. The method according to claim 1, wherein the obtaining the first roll gap correction amount of the roller press under feedback delay through the smith estimator comprises:

   Obtaining a first thickness deviation based on the total roll gap correction amount in the last control cycle;

   Calculate a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is a deviation value obtained by comparing the feedback thickness with a preset thickness;

   The third thickness deviation is input into the integral feedback closed loop to obtain the first roll gap correction amount of the rolling machine under feedback delay.
3. The method according to claim 2, wherein said obtaining the first thickness deviation based on the total roll gap correction amount in the last control period comprises:

   Acquiring the first pressure deviation and stiffness coefficient of the roller press, and obtaining the total roll gap correction amount in the last control cycle;

   Calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the last control cycle as the first thickness deviation.
4. The method according to claim 3, wherein, before obtaining the pressure deviation and the stiffness coefficient of the roller press, the method further comprises:

   When the roller press is in an offline test state, at least one set of sampling data of the roller press is acquired, wherein each of the sampling data includes a preset roll gap correction amount, and the preset roll gap correction Quantitatively adjust the second pressure deviation when the roll gap of the roller press is pressed down;

   A stiffness coefficient of the roller press is updated based on the at least one set of sampled data.
5. The method according to any one of claims 2 to 4, wherein said inputting said third thickness deviation into an integral feedback closed loop comprises:

   inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop;

   The acquisition of the second roll gap correction value associated with the feedback thickness includes:

   Inputting the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount;

   Wherein, the total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount.
6. The method according to claim 5, wherein said inputting the product of the third thickness deviation and the first weight into the integral feedback loop comprises:

   Obtaining the stiffness coefficient and the plasticity coefficient of the roller press, and calculating the elastic index value of the roller press based on the stiffness coefficient and the plasticity coefficient;

   The product of the elasticity index value, the first weight and the third thickness deviation is input into an integral feedback closed loop.
7. A control device for a roller press, comprising:

   The first correction amount acquisition module is used to obtain the first roll gap correction amount of the roller press under feedback delay through the smith estimator;

   The second correction amount acquisition module is configured to acquire a second roll gap correction amount associated with the feedback thickness, wherein the feedback thickness is the thickness of the battery pole piece after being rolled by a rolling press;

   A total correction amount acquisition module, configured to determine the total roll gap correction amount of the rolling press based on the first roll gap correction amount and the second roll gap correction amount;

   An adjustment module, configured to adjust the pressing roll gap of the rolling machine through the total roll gap correction amount.
8. The device according to claim 7, wherein the first correction amount acquisition module includes:

   a first thickness deviation acquisition unit, configured to acquire a first thickness deviation based on the total roll gap correction amount in the previous control cycle;

   The third thickness deviation acquisition unit is configured to calculate and obtain a third thickness deviation based on the first thickness deviation, the second thickness deviation and the time delay part, wherein the second thickness deviation is the difference between the feedback thickness and the preset The deviation value obtained by comparing the thickness;

   The first correction amount acquisition unit is configured to input the third thickness deviation into the integral feedback closed loop to obtain the first roll gap correction amount of the roller press under feedback delay.
9. The device according to claim 8, wherein the first thickness deviation acquisition unit comprises:

   The input amount acquisition subunit is used to acquire the first pressure deviation and stiffness coefficient of the roller press, and acquire the total roll gap correction amount in the last control cycle;

   The first thickness deviation calculation subunit is used to calculate the ratio of the first pressure deviation to the stiffness coefficient, and determine the sum of the ratio and the total roll gap correction amount in the previous control cycle as the first thickness deviation.
10. The apparatus of claim 9, further comprising:

    A sampling data acquisition module, configured to acquire at least one set of sampling data of the rolling machine when the rolling machine is in an offline test state, wherein each of the sampling data includes a preset roll gap correction amount, and by The preset roll gap correction amount adjusts the second pressure deviation of the roller press when pressing the roll gap;

    A stiffness coefficient updating module, configured to update the stiffness coefficient of the roller press based on the at least one set of sampling data.
11. The device according to any one of claims 8 to 10, wherein the first correction amount acquisition unit is specifically configured to:

    inputting the product of the third thickness deviation and the first weight into the integral feedback closed loop;

    The second correction amount acquisition module is specifically used for:

    Inputting the product of the second thickness deviation associated with the feedback thickness and the second weight into the integral feedback closed loop to obtain the second roll gap correction amount;

    Wherein, the total roll gap correction amount is the sum of the first roll gap correction amount and the second roll gap correction amount.
12. The device according to claim 11, wherein the first correction amount acquisition unit comprises:

    an elastic index value calculation subunit, configured to obtain the stiffness coefficient and the plastic coefficient of the roller press, and calculate the elastic index value of the roller press based on the stiffness coefficient and the plastic coefficient;

    The first correction amount acquisition subunit is configured to input the product of the elasticity index value, the first weight and the third thickness deviation into the integral feedback closed loop.
13. A rolling machine, comprising a processor, a memory, and a program or instruction stored on the memory and operable on the processor, when the program or instruction is executed by the processor, the claims 1- 6. The steps of the method for controlling the rolling machine described in any one of the 6.
14. A readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method for controlling a roller press according to any one of claims 1-6 are realized .

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