Rolling regulation and control method, device and equipment and medium

Abstract

The invention relates to the technical field of coating, and discloses a rolling regulation and control method, device and equipment and a medium, and the method comprises the following steps: determining a partition extreme value of each partition of a target pole piece according to a thickness measurement result of the target pole piece; the rolling pressure of the roller press is monitored, and cylinder bending control parameters are adjusted according to the rolling pressure; and according to the partition extreme value, the control target value and the cylinder bending control parameters, the cylinder bending pressure adjusting amount of a cylinder bending adjusting mechanism is determined so as to carry out rolling adjustment and control. According to the scheme, the bending cylinder control parameters can be adjusted according to the rolling pressure of the current roller press, the adjustment accuracy of the bending cylinder pressure is improved, and therefore the transverse consistency of pole piece rolling is improved.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and in particular to a roller pressure regulating method, device, equipment and medium. Background Art

[0002] The roller pressing process is an important electrode manufacturing process in the production process of lithium-ion batteries. The roller press compacts the electrode dry film obtained in the previous coating process to ensure that the materials are tightly combined and evenly distributed, thus building a good electrode structure.

[0003] The key control issue of the rolling process is to control the compaction density and compaction thickness uniformity to avoid material deformation or uneven compaction. At present, the rolling thickness closed loop is to adjust the rolling thickness by adjusting the roller gap or adjusting the rolling pressure to improve the mean consistency. At present, the width of the pole piece has been greatly increased. Due to the deadweight of the roller and the pole piece inserted between the double rollers, the upper and lower rollers will cause micro deformation, which will lead to poor lateral consistency of the pole piece rolling. At this time, a bending cylinder mechanism can usually be set in the roller press to apply a reverse force to the upper and lower rollers to reduce the micro deformation of the upper and lower rollers themselves.

[0004] However, it is difficult to accurately determine the adjustment amount of the bending cylinder mechanism in the above scheme, resulting in poor lateral consistency of the pole piece rolling process. Summary of the invention

[0005] In view of this, the present invention provides a rolling control method, device, system, equipment and medium to improve the lateral consistency of pole piece rolling.

[0006] In a first aspect, the present invention provides a roller pressure control method, the method comprising:

[0007] Determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece;

[0008] Monitoring the roller pressure of the roller press and adjusting the bending cylinder control parameters according to the roller pressure;

[0009] According to the partition extreme value, the control target value and the bending cylinder control parameter, the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism is determined to perform roller pressure control.

[0010] In a possible implementation, adjusting the bending cylinder control parameters according to the rolling pressure includes:

[0011] When the roller pressure is less than the pressure threshold, the bending cylinder control parameter is adjusted according to the roller pressure so that the bending cylinder control parameter is positively correlated with the roller pressure.

[0012] In a possible implementation, determining the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform roller pressure control according to the partition extreme value, the extreme difference threshold and the bending cylinder control parameter includes:

[0013] According to the partition extreme values ​​of each partition, obtaining the actual value of the partition extreme value;

[0014] Generate a control deviation value according to the difference between the partition range actual value and the partition range target value;

[0015] The control deviation value is used as an independent variable and the bending cylinder control parameter is used as a PID control parameter to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform bending cylinder adjustment.

[0016] In a possible implementation, determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece includes:

[0017] According to the horizontal order of the measurement positions, the thickness measurement results of the target pole piece are divided into a first partition, a second partition and a third partition, and the extreme values ​​of the first partition, the second partition and the third partition are obtained respectively;

[0018] The step of obtaining the actual value of the partition range according to the partition extreme value of each partition includes:

[0019] Obtain a first extreme difference between an extreme value of a first partition and an extreme value of a second partition, and a second extreme difference between an extreme value of a third partition and an extreme value of a second partition;

[0020] If both the first range and the second range exceed the threshold, and the range signs of the first range and the second range are the same, the average of the first range and the second range is taken as the actual value of the partition range.

[0021] In a possible implementation, when the extreme value of the first partition is greater than the extreme value of the second partition, the extreme value sign of the first range is positive; when the extreme value of the first partition is less than the extreme value of the second partition, the extreme value sign of the first range is negative;

[0022] When the extreme value of the third partition is greater than the extreme value of the second partition, the sign of the range of the third range is positive; when the extreme value of the third partition is less than the extreme value of the second partition, the sign of the range of the third range is negative.

[0023] In a possible implementation, determining the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform roller pressure control includes:

[0024] If the first extreme difference and the second extreme difference are both positive, the upper bending cylinder pressure and the lower bending cylinder pressure are reduced according to the bending cylinder pressure adjustment amount;

[0025] If the first extreme difference and the second extreme difference are both negative, the upper bending cylinder pressure and the lower bending cylinder pressure are increased according to the bending cylinder pressure adjustment amount.

[0026] In a possible implementation, the method further includes:

[0027] When the roller pressure is greater than or equal to the pressure threshold, the roller gap adjustment mechanism is controlled to perform roller pressure regulation according to a preset pressure adjustment amount to reduce the roller pressure.

[0028] In a possible implementation, determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece includes:

[0029] If the thickness measurement result of the target pole piece is obtained by the 2nth measurement, then according to the thickness measurement result of the target pole piece, the partition extreme value of each partition of the target pole piece is determined; wherein n≥1, and n is an integer;

[0030] The method further comprises:

[0031] If the thickness measurement result of the target pole piece is obtained by the 2n-1th measurement, the roll gap thickness of the target pole piece is determined according to the thickness measurement result of the target pole piece;

[0032] The roll gap pressure adjustment amount of the roll gap adjustment mechanism is determined according to the roll gap thickness of the target pole piece and the expected roll gap thickness, so as to control the roll gap adjustment mechanism to adjust according to the roll gap pressure adjustment amount.

[0033] In a possible implementation, before determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece, the method further includes:

[0034] The thickness of the target pole piece is detected according to the target period.

[0035] In a possible implementation, the method further includes:

[0036] Real-time detection of the rolling pressure value of the rolling press to obtain the speed change rate of the rolling press;

[0037] The target period is adjusted according to the speed change rate.

[0038] In a second aspect, the present invention provides a roller pressure regulating device, which is applied to a roller press; the roller press includes a bending cylinder regulating mechanism and a roller gap regulating mechanism; the device includes:

[0039] An extreme value acquisition module, used to determine the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece;

[0040] A pressure detection module, used to monitor the roller pressure of the roller press and adjust the bending cylinder control parameters according to the roller pressure;

[0041] The roller pressure control module is used to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the partition extreme difference target value and the bending cylinder control parameter to perform roller pressure control.

[0042] In a possible implementation, the pressure detection module is further configured to adjust a bending cylinder control parameter according to the rolling pressure when the rolling pressure is less than a pressure threshold, so that the bending cylinder control parameter is positively correlated with the rolling pressure.

[0043] In a possible implementation, the rolling pressure control module is used to obtain the actual value of the partition range according to the partition extreme value of each partition;

[0044] Generate a control deviation value according to the difference between the partition range actual value and the partition range target value;

[0045] The control deviation value is used as an independent variable and the bending cylinder control parameter is used as a PID control parameter to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform bending cylinder adjustment.

[0046] In a possible implementation, the extreme value acquisition module is used to divide the thickness measurement results of the target pole piece into a first partition, a second partition and a third partition according to the lateral order of the measurement positions, and respectively acquire the extreme values ​​of the first partition, the second partition and the third partition;

[0047] The rolling pressure control module is used to obtain a first extreme difference between an extreme value of the first partition and an extreme value of the second partition, and a second extreme difference between an extreme value of the third partition and an extreme value of the second partition;

[0048] If both the first range and the second range exceed the threshold, and the range signs of the first range and the second range are the same, the average of the first range and the second range is taken as the actual value of the partition range.

[0049] In a possible implementation, when the extreme value of the first partition is greater than the extreme value of the second partition, the extreme value sign of the first range is positive; when the extreme value of the first partition is less than the extreme value of the second partition, the extreme value sign of the first range is negative;

[0050] When the extreme value of the third partition is greater than the extreme value of the second partition, the sign of the range of the third range is positive; when the extreme value of the third partition is less than the extreme value of the second partition, the sign of the range of the third range is negative.

[0051] In a possible implementation, the rolling pressure regulating module is further used to:

[0052] If the first extreme difference and the second extreme difference are both positive, the upper bending cylinder pressure and the lower bending cylinder pressure are reduced according to the bending cylinder pressure adjustment amount;

[0053] If the first extreme difference and the second extreme difference are both negative, the upper bending cylinder pressure and the lower bending cylinder pressure are increased according to the bending cylinder pressure adjustment amount.

[0054] In a possible implementation, the roller pressure regulation module is further used to control the roller gap regulation mechanism to perform roller pressure regulation according to a preset pressure regulation amount to reduce the roller pressure when the roller pressure is greater than or equal to a pressure threshold.

[0055] In a possible implementation, the extreme value acquisition module is also used to determine the partition extremes of each partition of the target pole piece based on the thickness measurement result of the target pole piece if the thickness measurement result of the target pole piece is obtained by the 2nth measurement; wherein n≥1 and n is an integer.

[0056] The rolling pressure control module is also used to determine the roll gap thickness of the target pole piece according to the thickness measurement result of the target pole piece if the thickness measurement result of the target pole piece is obtained by the 2n-1th measurement; determine the roll gap pressure adjustment amount of the roll gap adjustment mechanism according to the roll gap thickness of the target pole piece and the expected roll gap thickness, so as to control the roll gap adjustment mechanism to adjust according to the roll gap pressure adjustment amount.

[0057] In a possible implementation manner, the device further includes:

[0058] The thickness detection module is used to detect the thickness of the target pole piece according to the target period.

[0059] In a possible implementation, the thickness detection module is further used to detect the rolling value of the roller press in real time to obtain the speed change rate of the roller press; and adjust the target cycle according to the speed change rate.

[0060] In a third aspect, a computer device is provided, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the above-mentioned rolling pressure control method by executing the computer instructions.

[0061] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the above-mentioned rolling pressure control method.

[0062] In a fifth aspect, a computer program product is provided, comprising computer instructions for causing a computer to execute the above-mentioned rolling pressure control method.

[0063] The technical solution provided by this application may have the following beneficial effects:

[0064] During the rolling process of the pole piece by the roller press, the upper and lower rollers are slightly deformed due to the substantial increase in the width of the pole piece. Therefore, in addition to the roller gap adjustment mechanism, the roller press is also provided with a bending cylinder adjustment mechanism, so as to reduce the micro-deformation by adjusting the bending cylinder pressure. In the production process of the target pole piece, the present application calculates the partition extreme values ​​of each partition of the target pole piece according to the thickness measurement results of the target pole piece, and then monitors the rolling pressure of the roller press, adjusts the bending cylinder control parameters according to the rolling pressure, and finally determines the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameters for rolling control. In the above scheme, the bending cylinder control parameters will be adjusted according to the current rolling pressure of the roller press, which improves the adjustment accuracy of the bending cylinder pressure, thereby improving the lateral consistency of the pole piece rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0066] Figure 1 A structural schematic diagram of a rolling structure of a rolling press involved in an embodiment of the present application is shown.

[0067] Figure 2 It is a method flow chart of a roller pressure control method according to an exemplary embodiment.

[0068] Figure 3 It is a method flow chart of a roller pressure control method according to an exemplary embodiment.

[0069] Figure 4 A PID control principle diagram involved in an embodiment of the present application is shown.

[0070] Figure 5 It is a structural schematic diagram of a roller pressure regulating device provided in an embodiment of the present application.

[0071] Figure 6 It is a structural schematic diagram of a computer device provided by an optional embodiment of the present invention. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0073] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0074] The rolling process is an important pole piece manufacturing process in the production process of lithium-ion batteries. The roller press compacts the pole piece dry film obtained in the previous coating process to ensure that the materials are tightly combined and evenly distributed, and to build a good electrode structure. Excellent rolling technology can improve the performance, cycle life and safety of the battery, and has an important impact on the stability and reliability of lithium-ion batteries. The key control issue of the rolling process is to control the uniformity of compaction density and compaction thickness to avoid material deformation or uneven compaction.

[0075] At present, the rolling thickness closed loop adjusts the rolling thickness by adjusting the roll gap or the rolling pressure, with the purpose of improving the mean consistency. At present, the width of the pole piece has been greatly increased. Due to the deadweight of the roller and the involvement of the pole piece between the double rollers, the upper and lower rollers themselves will be slightly deformed, which leads to the technical problem of poor lateral consistency of the pole piece rolling. The traditional automatic adjustment based on the roll gap and the rolling cylinder pressure cannot automatically eliminate the lateral consistency problem caused by the above reasons.

[0076] Please refer to Figure 1 , which shows a schematic diagram of the structure of a roller pressing structure of a roller pressing machine involved in an embodiment of the present application. Figure 1 The rolling process of the roller press shown includes an upper roller 101, a lower roller 102 and a pole piece 103, and the roller press also includes a bending cylinder adjustment mechanism and a roller gap adjustment mechanism. The roller gap adjustment mechanism is used to adjust the rolling pressure between the upper roller and the lower roller, thereby adjusting the roller gap height, that is, adjusting the thickness of the target pole piece.

[0077] However, due to the deadweight of the upper roller and the lower roller, the upper roller 101 and the lower roller 102 may undergo micro-deformation during the rolling process. Therefore, the roller press in the embodiment of the present application is also provided with a bending cylinder adjustment mechanism for respectively adjusting the upper bending cylinder pressure 104 and the lower bending cylinder pressure 105. By adjusting the upper bending cylinder pressure 104 and the lower bending cylinder pressure 105 through the bending cylinder adjustment mechanism, the micro-deformation of the upper roller 101 and the lower roller 102 during the rolling process can be offset to a certain extent.

[0078] Optionally, the roller press in the embodiment of the present application also has a corresponding controller, which can be implemented as a computer device, or the controller can also include but is not limited to a proportional integral differential controller (PID), an advanced process controller (APC), a model predictive controller (MPC), a fuzzy controller, and a neural network controller.

[0079] The controller can obtain the relevant parameters of the roller press during the rolling process in real time, such as the rolling pressure, the thickness measurement results of the target pole piece obtained by rolling, etc., and adjust the roller gap, upper bending cylinder pressure and lower bending cylinder pressure of the roller press in real time according to the relevant parameters in the rolling process, so as to improve the lateral consistency of the target pole piece.

[0080] Figure 2 is a method flow chart of a method for roller pressure control according to an exemplary embodiment. The method is executed by a computer device, which may be as follows Figure 1 The controller in the roller press shown in the figure can be realized by a computer device. Figure 2 As shown, the roller pressure control method may include the following steps:

[0081] Step 201, determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece.

[0082] In an embodiment of the present application, after obtaining the thickness measurement result of the target pole piece, it can be divided into multiple partitions according to the lateral width of the pole piece, so as to determine the degree of unevenness of the pole pieces in different areas.

[0083] Specifically, in the embodiment of the present application, the extreme value data of each partition can be obtained through the thickness measuring equipment, and a transverse thickness distribution diagram can be established to show the distribution of the thickness of each partition of the target pole piece, thereby guiding the adjustment of subsequent control parameters.

[0084] Step 202, monitoring the roller pressure of the roller press, and adjusting the bending cylinder control parameters according to the roller pressure.

[0085] In an embodiment of the present application, the computer equipment will monitor the rolling pressure of the roller press in real time. If the rolling pressure is within a suitable adjustment range, the bending cylinder control parameter used to calculate the bending cylinder adjustment amount will be affected by the rolling pressure. For example, the greater the rolling pressure, the greater the bending cylinder control parameter, thereby improving the accuracy of subsequent rolling pressure regulation by adjusting the bending cylinder pressure.

[0086] Step 203, determining the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameter to perform roller pressure control.

[0087] After obtaining the partition extreme value, the partition extreme value represents the degree of unevenness of the target pole piece to a certain extent, that is, the degree of lateral consistency. At this time, the computer equipment can compare the lateral consistency degree obtained according to the partition extreme value with the control target value (that is, the lateral consistency target value), and based on the error between the two, use the bending cylinder control parameter as a coefficient to generate the bending cylinder pressure adjustment amount, thereby adjusting the upper bending cylinder pressure and the lower bending cylinder pressure of the roller press, thereby completing the roller pressing control process.

[0088] In summary, during the rolling process of the pole piece by the roller press, the upper and lower rollers undergo micro-deformation due to the substantial increase in the width of the pole piece. Therefore, in addition to a roll gap adjustment mechanism, a bending cylinder adjustment mechanism is also provided in the roller press, so as to reduce the micro-deformation by adjusting the bending cylinder pressure. In the production process of the target pole piece, the present application calculates the partition extreme values ​​of each partition of the target pole piece according to the thickness measurement results of the target pole piece, and then monitors the rolling pressure of the roller press, adjusts the bending cylinder control parameters according to the rolling pressure, and finally determines the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameters for rolling control. In the above scheme, the bending cylinder control parameters will be adjusted according to the current rolling pressure of the roller press, which improves the adjustment accuracy of the bending cylinder pressure, thereby improving the lateral consistency of the pole piece rolling.

[0089] Figure 3 is a method flow chart of a method for roller pressure control according to an exemplary embodiment. The method is executed by a computer device, which may be as follows Figure 1 The controller in the roller press shown in the figure can be realized by a computer device. Figure 3 As shown, the roller pressure control method may include the following steps:

[0090] Step 301, determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece.

[0091] Optionally, the thickness measurement results of the target pole piece are divided into a first partition, a second partition and a third partition according to the lateral order of the measurement positions, and the extreme values ​​of the first partition, the second partition and the third partition are respectively obtained.

[0092] For example, all thickness measurements T all =[t1,t2,…,t n ], where n is the number of thickness detailed data. At this time, the thickness detailed data is divided into 3 parts, T1 = [t1,…,t n / / 3 ], T2 = [t n / / 3+1 ,…,t 2*(n / / 3) ], T3 = [t 2*(n / / 3)+1 ,…,t n], where n / / 3 is the integer part of n divided by 3.

[0093] At this time, for each partition, the maximum and minimum values ​​of the partition T can be obtained. 1,max =max(T1),T 1,min =min(T1),T 2,max =max(T2), T 2,min =min(T2),T 3,max =max(T3), T 3,min =min(T3).

[0094] During the rolling process of the pole piece, the distribution of the pole piece thickness may not be uniform. The pole piece after rolling may have different thickness variations on both sides and in the middle due to the processing process, equipment characteristics or material distribution.

[0095] Therefore, the thickness measurement results of the target pole piece can be divided into a left area (i.e., the first partition T1), a middle area (i.e., the second partition T2) and a right area (i.e., the third partition T3) in accordance with the horizontal sorting, and the deviations between the two ends and the middle can be analyzed respectively.

[0096] Step 302, monitoring the roller pressure of the roller press, and when the roller pressure is less than a pressure threshold, adjusting the bending cylinder control parameter according to the roller pressure, so that the bending cylinder control parameter is positively correlated with the roller pressure.

[0097] In another possible implementation, when the roller pressure is greater than or equal to a pressure threshold, the roller gap adjustment mechanism is controlled to perform roller pressure regulation according to a preset pressure adjustment amount to reduce the roller pressure.

[0098] In the embodiment of the present application, before the bending cylinder control is performed, it is also necessary to determine whether the roller pressure at this time exceeds the adjustment range of the bending cylinder. When the roller pressure is larger, if it is necessary to reduce the micro deformation caused by the roller pressure, a larger bending cylinder pressure adjustment amount is required. Therefore, when the roller pressure is larger, the coefficient for adjusting the bending cylinder pressure adjustment amount (i.e., the bending cylinder control parameter) can increase with the roller pressure.

[0099] It is optional, but if the rolling pressure increases to a level greater than or equal to the pressure threshold, it can be considered that the state of the roller press has exceeded the limit that the bending cylinder can adjust. At this time, the roller gap adjustment mechanism can be directly controlled to reduce the rolling pressure of the upper and lower rollers on the target pole piece, so that the roller press is in normal working condition.

[0100] Step 303: Obtain the actual value of the partition range according to the partition extreme value of each partition.

[0101] In a possible implementation of the embodiment of the present application, the range of each partition may be used as a basis for judging the horizontal consistency.

[0102] The partition range is defined as the difference between the maximum and minimum values ​​of two adjacent partitions. For example, the first range between the first partition and the second partition range(T1,T2) = T 1,max -T 2,min ; and the first range of the third partition and the second partition range (T3, T2) = T 3,max -T 2,min ; The larger the range, the more significant the unevenness of thickness distribution between regions, and the more adjustment is needed.

[0103] Optionally, obtain the first range between the extreme value of the first partition and the extreme value of the second partition, and the second range between the extreme value of the third partition and the extreme value of the second partition; if the first range and the second range both exceed the threshold, and the range signs of the first range and the second range are the same, then take the average of the first range and the second range as the actual value of the partition range.

[0104] In the embodiment of the present application, the threshold is set to ensure that the system is adjusted only when it is really needed, so as to avoid oversensitivity and frequent control. During the processing, the equipment will inevitably have slight errors. These slight thickness changes have little effect on the performance of the pole piece, so no adjustment is required. Only when the first range and the second range both exceed the threshold, then it is determined whether the range signs of the first range and the second range are the same.

[0105] Optionally, when the extreme value of the first partition is greater than the extreme value of the second partition, the sign of the range of the first range is positive; when the extreme value of the first partition is less than the extreme value of the second partition, the sign of the range of the first range is negative;

[0106] When the extreme value of the third partition is greater than the extreme value of the second partition, the sign of the range of the third range is positive; when the extreme value of the third partition is less than the extreme value of the second partition, the sign of the range of the third range is negative.

[0107] Assuming that the signs of the first range and the second range are the same, it means that the ranges on both sides are large and have the same trend (for example, both sides are thinner than the middle or both sides are thicker than the middle), indicating that the system may be unbalanced as a whole and the pressure needs to be adjusted to balance the thickness; if the signs of the first range and the second range are different, it means that the deviation directions on both sides are opposite (for example, the left side is thinner than the middle, and the right side is thicker than the middle). At this time, the lateral consistency problem may be caused by other processing factors (such as local material fluctuations), and directly adjusting the pressure may be ineffective or even have certain negative effects.

[0108] Step 304: Generate a control deviation value according to the difference between the partition range actual value and the control target value.

[0109] In the embodiment of the present application, the actual value of the partition range and the control target value (the partition range target value in the embodiment of the present application) are obtained, and the error between the two can be used as the control deviation value to facilitate subsequent PID control.

[0110] Step 305, using the control deviation value as an independent variable and the bending cylinder control parameter as a PID control parameter, the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism is determined to perform bending cylinder adjustment.

[0111] Specifically, in the embodiment of the present application, if the controller is a PID controller, which is used to calculate the bending cylinder pressure adjustment amount of the roller press, the bending cylinder control parameters include the proportional coefficient (K p )、Integral coefficient (K i ), differential coefficient (K d )Three control parameters.

[0112] r(t) is the partition range target value, e(t) is the control deviation value, u(t) is the bending cylinder pressure adjustment amount calculated by the controller, y(t) is the thickness response and change of the pole piece after the bending cylinder pressure adjustment amount acts on the controlled object, c(t) is the partition range value detected by the detection device and obtained through data processing. At this time, the calculation formula of the PID control amount is as follows:

[0113] u(t)=K p *e(t)+K i *∫e(t)dt+K d *de(t) / dt;

[0114] Among them, ∫e(t)dt is the integral of the control deviation value with time, and de(t) / dt refers to the derivative of the control deviation value with respect to time.

[0115] Furthermore, after calculating the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism, it is necessary to determine the adjustment direction of the upper bending cylinder and the lower bending cylinder. At this time, the adjustment direction of the upper bending cylinder and the lower bending cylinder can be determined according to the concavity and convexity of the target pole piece.

[0116] Optionally, if the first extreme difference and the second extreme difference are both positive, it means that the extreme values ​​of the two side areas of the target pole piece are greater than the extreme value of the middle area, and the target pole piece is in a concave state. Therefore, in order to alleviate the concave state, the upper bending cylinder pressure and the lower bending cylinder pressure can be reduced according to the bending cylinder pressure adjustment amount.

[0117] Correspondingly, if the first extreme difference and the second extreme difference are both negative, it means that the extreme values ​​of the two side areas of the target pole piece are smaller than the extreme values ​​of the middle area, and the target pole piece is in a convex state. The upper bending cylinder pressure and the lower bending cylinder pressure can be increased according to the bending cylinder pressure adjustment amount.

[0118] In another possible implementation of the embodiment of the present application, the convexity of the target pole piece can also be judged based on the average thickness of the first partition, the second partition and the third partition. For example, in the embodiment of the present application, the average thickness T1 of the first partition, the average thickness T2 of the second partition and the average thickness T3 of the third partition can be obtained; when T2 < 1 / 2 (T1 + T3), the target pole piece is in a concave state; when T2 > 1 / 2 (T1 + T3), the target pole piece is in a convex state.

[0119] Please refer to Figure 4 , which shows a PID control principle diagram involved in the embodiment of the present application. Figure 4 As shown, after the controlled object (i.e., the roller press) rolls the target pole piece, the detection device (such as a laser measuring instrument) can detect the thickness of the target pole piece and process it through a computer device to obtain a partition range; the computer device then processes it through a PID controller based on the control deviation value between the partition range and the partition range target value, thereby obtaining the bending cylinder pressure adjustment amount calculated by the controller, thereby controlling the controlled object.

[0120] Optionally, in the embodiment of the present application, the roller gap adjustment and the bending cylinder adjustment need to be processed in coordination. Specifically, in the embodiment of the present application, the thickness of the target pole piece can be detected according to the target cycle;

[0121] If the thickness measurement result of the target pole piece is obtained by the 2nth measurement, the partition extreme value of each partition of the target pole piece is determined according to the thickness measurement result of the target pole piece; wherein n≥1, and n is an integer. At this time, jump to step 301 to execute the bending cylinder pressure adjustment process shown in the embodiment of the present application;

[0122] If the thickness measurement result of the target pole piece is obtained by the 2n-1th measurement, the roll gap thickness of the target pole piece is determined according to the thickness measurement result of the target pole piece; at this time, the controller determines the roll gap pressure adjustment amount of the roll gap adjustment mechanism according to the roll gap thickness of the target pole piece and the expected roll gap thickness, so as to control the roll gap adjustment mechanism to adjust according to the roll gap pressure adjustment amount.

[0123] That is to say, after completing a bending cylinder pressure adjustment process, that is, the fine-tuning process of the target pole piece thickness, and adjusting the lateral consistency of the target pole piece, the next target pole piece thickness detection result can be used to complete a roller gap thickness adjustment, thereby ensuring that the thickness during the rolling process always meets the process requirements.

[0124] Optionally, in an embodiment of the present application, the rolling pressure value of the roller press can also be detected in real time to obtain the speed change rate of the roller press; and the target cycle is adjusted according to the speed change rate.

[0125] Since the rolling speed-up and speed-down processes are very fast during the rolling process (the speed-up time of 5-80m / min is about 1-2min), the traditional control system cannot control the thickness in time due to factors such as fixed adjustment frequency (for example, adjustment once every 21-35s), resulting in large thickness fluctuations during the speed-up process. Therefore, the thickness measurement period of the target pole piece in the embodiment of the present application can be dynamically changed according to the speed change rate, and the thickness measurement period is actually equivalent to the period of roller gap adjustment and bending cylinder adjustment. Therefore, if the speed change rate increases, the period of roller gap adjustment and bending cylinder adjustment will also increase accordingly; if the speed change rate decreases, the period of roller gap adjustment and bending cylinder adjustment will also decrease accordingly.

[0126] In the above steps of the embodiment of the present application, the extreme differences of each partition are exemplarily used as the basis for judging the lateral consistency. However, in another possible implementation, the embodiment of the present application can also use other indicators that can be used to judge the lateral consistency instead of the partition extreme difference, so as to realize the control of the roller pressing, and the above parameters include but are not limited to indicators such as covariance (COV), curvature, and concavity. When using indicators such as covariance, curvature, and concavity, the computer equipment can still control the roller press according to the actual detection value of the target pole piece (for example, the covariance, curvature, and concavity of each partition are obtained by data including the extreme values ​​of each partition) and the error between the preset value of the indicator. The specific execution principle is similar to that of steps 301 to 305, which will not be repeated here.

[0127] In summary, during the rolling process of the pole piece by the roller press, the upper and lower rollers undergo micro-deformation due to the substantial increase in the width of the pole piece. Therefore, in addition to a roll gap adjustment mechanism, a bending cylinder adjustment mechanism is also provided in the roller press, so as to reduce the micro-deformation by adjusting the bending cylinder pressure. In the production process of the target pole piece, the present application calculates the partition extreme values ​​of each partition of the target pole piece according to the thickness measurement results of the target pole piece, and then monitors the rolling pressure of the roller press, adjusts the bending cylinder control parameters according to the rolling pressure, and finally determines the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameters for rolling control. In the above scheme, the bending cylinder control parameters will be adjusted according to the current rolling pressure of the roller press, which improves the adjustment accuracy of the bending cylinder pressure, thereby improving the lateral consistency of the pole piece rolling.

[0128] In the embodiments of the present application, a roller pressure control device is also provided, which is used to implement the above embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0129] The embodiment of the present application provides a roller pressure control device, Figure 5 : is a structural schematic diagram of a roller pressure regulating device provided in an embodiment of the present application, the device comprising:

[0130] The extreme value acquisition module 501 is used to determine the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece;

[0131] A pressure detection module 502, used to monitor the roller pressure of the roller press and adjust the bending cylinder control parameters according to the roller pressure;

[0132] The roll pressure control module 503 is used to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameter to perform roll pressure control.

[0133] In a possible implementation, the pressure detection module 502 is further configured to adjust a bending cylinder control parameter according to the rolling pressure when the rolling pressure is less than a pressure threshold, so that the bending cylinder control parameter is positively correlated with the rolling pressure.

[0134] In a possible implementation, the rolling pressure control module 503 is used to obtain the actual value of the partition range according to the partition extreme value of each partition;

[0135] Generate a control deviation value according to the difference between the partition range actual value and the partition range target value;

[0136] The control deviation value is used as an independent variable and the bending cylinder control parameter is used as a PID control parameter to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform bending cylinder adjustment.

[0137] In a possible implementation, the extreme value acquisition module 501 is used to divide the thickness measurement results of the target pole piece into a first partition, a second partition and a third partition according to the horizontal order of the measurement positions, and respectively obtain the extreme values ​​of the first partition, the second partition and the third partition;

[0138] The rolling pressure control module 503 is used to obtain a first extreme difference between the extreme value of the first partition and the extreme value of the second partition, and a second extreme difference between the extreme value of the third partition and the extreme value of the second partition;

[0139] If both the first range and the second range exceed the threshold, and the range signs of the first range and the second range are the same, the average of the first range and the second range is taken as the actual value of the partition range.

[0140] In a possible implementation, when the extreme value of the first partition is greater than the extreme value of the second partition, the extreme value sign of the first range is positive; when the extreme value of the first partition is less than the extreme value of the second partition, the extreme value sign of the first range is negative;

[0141] When the extreme value of the third partition is greater than the extreme value of the second partition, the sign of the range of the third range is positive; when the extreme value of the third partition is less than the extreme value of the second partition, the sign of the range of the third range is negative.

[0142] In a possible implementation, the rolling pressure regulating module 503 is further used to:

[0143] If the first extreme difference and the second extreme difference are both positive, the upper bending cylinder pressure and the lower bending cylinder pressure are reduced according to the bending cylinder pressure adjustment amount;

[0144] If the first extreme difference and the second extreme difference are both negative, the upper bending cylinder pressure and the lower bending cylinder pressure are increased according to the bending cylinder pressure adjustment amount.

[0145] In a possible implementation, the roller pressure regulating module 503 is further configured to control the roller gap regulating mechanism to perform roller pressure regulation according to a preset pressure regulation amount to reduce the roller pressure when the roller pressure is greater than or equal to a pressure threshold.

[0146] In a possible implementation, the extreme value acquisition module 501 is also used to determine the partition extremes of each partition of the target pole piece according to the thickness measurement result of the target pole piece if the thickness measurement result of the target pole piece is obtained by the 2nth measurement; wherein n≥1 and n is an integer.

[0147] The rolling pressure control module 503 is also used to determine the roll gap thickness of the target pole piece according to the thickness measurement result of the target pole piece if the thickness measurement result of the target pole piece is obtained by the 2n-1th measurement; determine the roll gap pressure adjustment amount of the roll gap adjustment mechanism according to the roll gap thickness of the target pole piece and the expected roll gap thickness, so as to control the roll gap adjustment mechanism to adjust according to the roll gap pressure adjustment amount.

[0148] In a possible implementation manner, the device further includes:

[0149] The thickness detection module is used to detect the thickness of the target pole piece according to the target period.

[0150] In a possible implementation, the thickness detection module is further used to detect the rolling value of the roller press in real time to obtain the speed change rate of the roller press; and adjust the target cycle according to the speed change rate.

[0151] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0152] In summary, during the rolling process of the pole piece by the roller press, the upper and lower rollers undergo micro-deformation due to the substantial increase in the width of the pole piece. Therefore, in addition to a roll gap adjustment mechanism, a bending cylinder adjustment mechanism is also provided in the roller press, so as to reduce the micro-deformation by adjusting the bending cylinder pressure. In the production process of the target pole piece, the present application calculates the partition extreme values ​​of each partition of the target pole piece according to the thickness measurement results of the target pole piece, and then monitors the rolling pressure of the roller press, adjusts the bending cylinder control parameters according to the rolling pressure, and finally determines the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameters for rolling control. In the above scheme, the bending cylinder control parameters will be adjusted according to the current rolling pressure of the roller press, which improves the adjustment accuracy of the bending cylinder pressure, thereby improving the lateral consistency of the pole piece rolling.

[0153] The roller pressure control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0154] An embodiment of the present invention further provides a computer device, which can be implemented as the computer device in the above-mentioned roller press.

[0155] See also Figure 6 , Figure 6 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 6 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphic information in a graphical user interface on an external input / output device (such as a display device coupled to an interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0156] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0157] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0158] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0159] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0160] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0161] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0162] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0163] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A roller pressure control method, characterized in that: The method is applied to a roller press; the roller press comprises a bending cylinder adjustment mechanism and a roller gap adjustment mechanism; the method comprises: Determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece; Monitoring the roller pressure of the roller press and adjusting the bending cylinder control parameters according to the roller pressure; According to the partition extreme value, the control target value and the bending cylinder control parameter, the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism is determined to perform roller pressure control.

2. The method according to claim 1, characterized in that The step of adjusting the bending cylinder control parameters according to the rolling pressure includes: When the roller pressure is less than the pressure threshold, the bending cylinder control parameter is adjusted according to the roller pressure so that the bending cylinder control parameter is positively correlated with the roller pressure.

3. The method according to claim 2, characterized in that The control target value is the partition range target value; The step of determining the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform roller pressure control according to the partition extreme value, the extreme difference threshold and the bending cylinder control parameter includes: According to the partition extreme values ​​of each partition, obtaining the actual value of the partition extreme value; Generate a control deviation value according to the difference between the actual partition range value and the target partition range value; The control deviation value is used as an independent variable and the bending cylinder control parameter is used as a PID control parameter to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform bending cylinder adjustment.

4. The method according to claim 3, characterized in that Determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece includes: According to the horizontal order of the measurement positions, the thickness measurement results of the target pole piece are divided into a first partition, a second partition and a third partition, and the extreme values ​​of the first partition, the second partition and the third partition are obtained respectively; The step of obtaining the actual value of the partition range according to the partition extreme value of each partition includes: Obtain a first extreme difference between an extreme value of a first partition and an extreme value of a second partition, and a second extreme difference between an extreme value of a third partition and an extreme value of a second partition; If both the first range and the second range exceed the threshold, and the range signs of the first range and the second range are the same, the average of the first range and the second range is taken as the actual value of the partition range.

5. The method according to claim 4, characterized in that When the extreme value of the first partition is greater than the extreme value of the second partition, the sign of the range of the first range is positive; when the extreme value of the first partition is less than the extreme value of the second partition, the sign of the range of the first range is negative; When the extreme value of the third partition is greater than the extreme value of the second partition, the sign of the range of the third range is positive; when the extreme value of the third partition is less than the extreme value of the second partition, the sign of the range of the third range is negative.

6. The method according to claim 5, characterized in that The step of determining the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism to perform roller pressure control includes: If the first extreme difference and the second extreme difference are both positive, the upper bending cylinder pressure and the lower bending cylinder pressure are reduced according to the bending cylinder pressure adjustment amount; If the first extreme difference and the second extreme difference are both negative, the upper bending cylinder pressure and the lower bending cylinder pressure are increased according to the bending cylinder pressure adjustment amount.

7. The method according to claim 2, characterized in that The method further comprises: When the roller pressure is greater than or equal to the pressure threshold, the roller gap adjustment mechanism is controlled to perform roller pressure regulation according to a preset pressure adjustment amount to reduce the roller pressure.

8. The method according to any one of claims 1 to 7, characterized in that: Determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece includes: If the thickness measurement result of the target pole piece is obtained by the 2nth measurement, then according to the thickness measurement result of the target pole piece, the partition extreme value of each partition of the target pole piece is determined; wherein n≥1, and n is an integer; The method further comprises: If the thickness measurement result of the target pole piece is obtained by the 2n-1th measurement, the roll gap thickness of the target pole piece is determined according to the thickness measurement result of the target pole piece; The roll gap pressure adjustment amount of the roll gap adjustment mechanism is determined according to the roll gap thickness of the target pole piece and the expected roll gap thickness, so as to control the roll gap adjustment mechanism to adjust according to the roll gap pressure adjustment amount.

9. The method according to claim 8, characterized in that Before determining the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece, the method further includes: The thickness of the target pole piece is detected according to the target period.

10. The method according to claim 9, characterized in that The method further comprises: Real-time detection of the roller pressure value of the roller press to obtain the speed change rate of the roller press; The target period is adjusted according to the speed change rate.

11. A roller pressure regulating device, characterized in that: The device is applied to a roller press; the roller press comprises a bending cylinder adjustment mechanism and a roller gap adjustment mechanism; the device comprises: An extreme value acquisition module, used to determine the partition extreme value of each partition of the target pole piece according to the thickness measurement result of the target pole piece; A pressure detection module, used to monitor the roller pressure of the roller press and adjust the bending cylinder control parameters according to the roller pressure; The roller pressure control module is used to determine the bending cylinder pressure adjustment amount of the bending cylinder adjustment mechanism according to the partition extreme value, the control target value and the bending cylinder control parameter to perform roller pressure control.

12. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the roller pressure control method according to any one of claims 1 to 10 by executing the computer instructions.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the rolling control method according to any one of claims 1 to 10.

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