Pole piece rolling control method and pole piece rolling device

Abstract

The invention provides a pole piece rolling control method and a pole piece rolling device.A pole piece is rolled according to a rolling pressure value and a rolling speed, the current pole piece thickness of the rolled pole piece is collected, and the thickness adjusting amount is determined according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness; according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed, a speed increasing signal is generated, the pole piece is unwound, the unwinding diameter is collected, the pole piece is wound, the winding diameter is collected, the rolling pressure value is adjusted based on the thickness adjusting amount, and the rolling speed is adjusted based on the rolling pressure value. And the rolling speed is adjusted based on the winding diameter, the unwinding diameter, the rolling speed and the speed increasing signal. Therefore, the working efficiency is improved while the uniform thickness of the pole piece is ensured, and manual intervention is not needed in the pole piece rolling control process, so that manpower is saved.

Description

Technical Field

[0001] The present application relates to the technical field of battery pole piece rolling mills, and in particular to a pole piece rolling control method and a pole piece rolling device. Background Art

[0002] In the manufacturing process of lithium-ion batteries, the rolling process of pole pieces is one of the key steps to ensure the performance of the battery cell. By precisely controlling the thickness and density of the pole pieces, the energy density, cycle life and safety of the battery can be significantly improved.

[0003] In the prior art, most manufacturers currently rely on manually adjusting the rolling pressure or the rolling gap to control the thickness of the pole piece during the rolling process.

[0004] However, manual intervention may result in fluctuations in coating surface density and poor thickness consistency, and operator negligence or lack of experience may lead to inaccurate setting of rolling parameters. Manual starting and stopping of equipment may aggravate the problem of inconsistent electrode thickness. Summary of the invention

[0005] The purpose of the present application is to provide a pole piece rolling control method and a pole piece rolling device to address the deficiencies in the above-mentioned prior art, so as to solve the problem of inconsistent pole piece thickness in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] In a first aspect, the present application provides a pole piece rolling control method, the method comprising:

[0008] Rolling the pole piece according to a preset rolling pressure value and a preset rolling speed;

[0009] Collecting the current pole piece thickness of the pole piece after rolling, and determining the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness, and generating a speed increase signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed;

[0010] Unwinding the pole piece and collecting the unwinding diameter;

[0011] Rolling up the pole piece and collecting the winding diameter;

[0012] The roller pressure value is adjusted based on the thickness adjustment amount, and the roller speed is adjusted based on the winding diameter, the unwinding diameter, the roller speed and the speed increase signal.

[0013] Optionally, determining the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset period of time, and a preset target pole piece thickness includes:

[0014] Obtaining a preset first coefficient, a second coefficient, and a third coefficient, wherein the first coefficient is used to characterize a proportional gain, the second coefficient is used to characterize an integral time, and the third coefficient is used to characterize a differential time;

[0015] Determine a current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness;

[0016] determining an integral value of the current thickness difference, and taking a product of a reciprocal of the second coefficient and the integral value as a first intermediate value;

[0017] determining a differential value of the current thickness difference, and taking a product of the third coefficient and the differential value as a second intermediate value;

[0018] taking the sum of the current thickness difference, the first intermediate value and the second intermediate value as a third intermediate value;

[0019] The product of the third intermediate value and the first coefficient is calculated to obtain the thickness adjustment amount.

[0020] Optionally, determining the current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness includes:

[0021] Performing weighted average calculation on the current pole piece thickness and the historical pole piece thickness to obtain the thickness to be adjusted;

[0022] The difference between the thickness to be adjusted and the target pole piece thickness is taken as the current thickness difference.

[0023] Optionally, the generating of the speed-up signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, a preset thickness deviation interval, the rolling speed and a preset maximum speed includes:

[0024] If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

[0025] Optionally, adjusting the rolling speed based on the winding diameter, the unwinding diameter, the rolling speed and the speed increase signal includes:

[0026] If the winding diameter is in a first winding diameter interval and the unwinding diameter is in a first unwinding diameter interval, determining a first speed threshold corresponding to the first unwinding diameter interval, and adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information;

[0027] If the winding diameter is in the second winding diameter interval, and the unwinding diameter is in the second unwinding diameter interval, a second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the second speed threshold and the speed adjustment information, the diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold;

[0028] If the winding diameter is in the third winding diameter interval, and the unwinding diameter is in the third unwinding diameter interval, a third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the third speed threshold and the speed adjustment information, the diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold;

[0029] If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the fourth speed threshold corresponding to the fourth unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the fourth speed threshold and the speed adjustment information, the diameter in the fourth winding diameter interval is greater than the diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

[0030] Optionally, the speed adjustment information includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to the speed threshold, and the speed threshold includes the first speed threshold, the second speed threshold, the third speed threshold or the fourth speed threshold;

[0031] The adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information includes:

[0032] Calculating a difference between the first speed threshold and the rolling speed;

[0033] Calculating a ratio of the difference to the adjustment step amount;

[0034] The ratio is taken as the adjusted rolling speed.

[0035] Optionally, the speed adjustment information includes: a unit adjustment amount, wherein the unit adjustment amount is used to represent an adjustment amount of a single adjustment of the rolling speed;

[0036] The adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information includes:

[0037] The sum of the rolling speed and the unit adjustment amount is taken as the adjusted rolling speed.

[0038] Optionally, the method further comprises:

[0039] If the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, an alarm signal is output.

[0040] In a second aspect, the present application provides a pole piece rolling device, the device comprising an unwinding module, a rolling module, a thickness measuring module and a winding module, the unwinding module is connected to the rolling module, the thickness measuring module is connected to the rolling module, and the winding module is connected to the rolling module;

[0041] The rolling module is used to roll the pole piece according to a preset rolling pressure value and a preset rolling speed;

[0042] The thickness measuring module is used to collect the current pole piece thickness of the pole piece after rolling, and determine the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness, and generate a speed increase signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed;

[0043] The unwinding module is used to unwind the pole piece and collect the unwinding diameter;

[0044] The winding module is used to wind up the pole piece and collect the winding diameter;

[0045] The rolling module is further used to adjust the rolling pressure value based on the thickness adjustment amount, and to adjust the rolling speed based on the winding diameter, the unwinding diameter, the rolling speed and the speed increase signal.

[0046] Optionally, the thickness measurement module is specifically used for:

[0047] Obtaining a preset first coefficient, a second coefficient, and a third coefficient, wherein the first coefficient is used to characterize a proportional gain, the second coefficient is used to characterize an integral time, and the third coefficient is used to characterize a differential time;

[0048] Determine a current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness;

[0049] determining an integral value of the current thickness difference, and taking a product of a reciprocal of the second coefficient and the integral value as a first intermediate value;

[0050] determining a differential value of the current thickness difference, and taking a product of the third coefficient and the differential value as a second intermediate value;

[0051] taking the sum of the current thickness difference, the first intermediate value and the second intermediate value as a third intermediate value;

[0052] The product of the third intermediate value and the first coefficient is calculated to obtain the thickness adjustment amount.

[0053] Optionally, the thickness measurement module is specifically used for:

[0054] Performing weighted average calculation on the current pole piece thickness and the historical pole piece thickness to obtain the thickness to be adjusted;

[0055] The difference between the thickness to be adjusted and the target pole piece thickness is taken as the current thickness difference.

[0056] Optionally, the thickness measurement module is specifically used for:

[0057] If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

[0058] Optionally, the rolling module is specifically used for:

[0059] If the winding diameter is in a first winding diameter interval and the unwinding diameter is in a first unwinding diameter interval, determining a first speed threshold corresponding to the first unwinding diameter interval, and adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information;

[0060] If the winding diameter is in the second winding diameter interval, and the unwinding diameter is in the second unwinding diameter interval, a second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the second speed threshold and the speed adjustment information, the diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold;

[0061] If the winding diameter is in the third winding diameter interval, and the unwinding diameter is in the third unwinding diameter interval, a third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the third speed threshold and the speed adjustment information, the diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold;

[0062] If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the fourth speed threshold corresponding to the fourth unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the fourth speed threshold and the speed adjustment information, the diameter in the fourth winding diameter interval is greater than the diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

[0063] Optionally, the speed adjustment information includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to the speed threshold, and the speed threshold includes the first speed threshold, the second speed threshold, the third speed threshold or the fourth speed threshold;

[0064] The rolling module is specifically used for:

[0065] Calculating a difference between the first speed threshold and the rolling speed;

[0066] Calculating a ratio of the difference to the adjustment step amount;

[0067] The ratio is taken as the adjusted rolling speed.

[0068] Optionally, the speed adjustment information includes: a unit adjustment amount, wherein the unit adjustment amount is used to represent an adjustment amount of a single adjustment of the rolling speed;

[0069] The rolling module is specifically used for:

[0070] The sum of the rolling speed and the unit adjustment amount is taken as the adjusted rolling speed.

[0071] Optionally, the rolling module is also used for:

[0072] If the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, an alarm signal is output.

[0073] Optionally, the rolling module is further used to send a heartbeat signal to the thickness measuring module according to a preset time period, and receive a response signal sent by the thickness measuring module, wherein the response signal is used to indicate that the rolling module and the thickness measuring module can communicate normally.

[0074] The beneficial effects of the present application are: while unwinding and rewinding the pole piece, the current pole piece thickness of the pole piece after rolling is collected, and the thickness adjustment amount is determined according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness, so as to adjust the rolling pressure value according to the thickness adjustment amount, so that the pole piece thickness gradually approaches the target pole piece thickness, and avoid the problem of uneven pole piece thickness. In addition, a speed-up signal is generated according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the thickness deviation range, the rolling speed and the maximum speed, so as to adjust the rolling speed based on the winding diameter, the unwinding diameter, the rolling speed and the speed-up signal, so as to improve the work efficiency while ensuring the uniform thickness of the pole piece. In the pole piece rolling control process, no manual intervention is required, thus saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0076] Figure 1 It is a flow chart of a pole piece rolling control method provided in an embodiment of the present application;

[0077] Figure 2 is a schematic diagram of a process for determining a thickness adjustment amount provided in an embodiment of the present application;

[0078] Figure 3 It is a schematic diagram of a process for adjusting the rolling speed provided in an embodiment of the present application;

[0079] Figure 4 It is a schematic diagram of the interval of a winding diameter and an unwinding diameter provided in an embodiment of the present application;

[0080] Figure 5 This is a schematic diagram of a speed reduction process provided by an embodiment of the present application;

[0081] Figure 6 is a flow chart of a method for adjusting rolling speed provided in an embodiment of the present application;

[0082] Figure 7 It is a schematic diagram of the steps of a method for increasing speed provided in an embodiment of the present application;

[0083] Figure 8 It is a structural schematic diagram of a pole piece rolling control device provided in an embodiment of the present application;

[0084] Fig. 9 It is a flow chart of another pole piece rolling control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0085] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0086] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0087] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0088] In the existing technology, most manufacturers rely on manual adjustment of rolling pressure or rolling gap to control the thickness of the pole piece during the rolling process, and then speed up the rolling process of the pole piece with reference to the target thickness value of the pole piece. However, manual intervention may cause problems such as fluctuations in coating surface density and poor thickness consistency, and the operator's negligence or lack of experience may lead to inaccurate setting of rolling parameters, which ultimately leads to the mismatch of the battery cell winding and assembly process, resulting in a large number of scrapped cores. Manually starting and stopping equipment may aggravate the problem of inconsistent pole piece thickness.

[0089] Based on this, the present application proposes a pole piece rolling control method, which unwinds and reels the pole piece respectively, and collects the unwinding reel diameter and the rewinding reel diameter, first rolls the pole piece according to a preset rolling pressure value and a preset rolling speed, collects the current pole piece thickness of the pole piece to calculate the thickness adjustment amount, and generates a speed increase signal based on information such as the current pole piece thickness, adjusts the rolling pressure value based on the thickness adjustment amount, and adjusts the rolling speed based on the reel diameter, unwinding reel diameter, rolling speed and speed increase signal, thereby avoiding the problem of inconsistent pole piece thickness and improving work efficiency while ensuring stable rolling.

[0090] Next, refer to Figure 1 The specific steps of the pole piece rolling control method in this application are introduced. Among them, Figure 1 It is a flow chart of a pole piece rolling control method provided in an embodiment of the present application.

[0091] S101 , rolling the pole piece according to a preset rolling pressure value and a preset rolling speed.

[0092] Optionally, at the beginning of pole piece rolling, a rolling pressure value and a rolling speed may be preset, so that the pole piece is rolled according to the preset rolling pressure value and the preset rolling speed. Specifically, a programmable logic controller (PLC) may be used to apply pressure to the pole piece based on the preset rolling pressure value, and at the same time, the speed of rolling the pole piece is controlled according to the preset rolling speed to achieve speed control.

[0093] S102, collecting the current pole sheet thickness of the pole sheet after rolling, and determining the thickness adjustment amount according to the current pole sheet thickness, the historical pole sheet thickness within a preset time period and the preset target pole sheet thickness, and generating a speed increase signal according to the current pole sheet thickness, the historical pole sheet thickness, the target pole sheet thickness, the preset thickness deviation range, the rolling speed and the preset maximum speed.

[0094] As an optional implementation, the thickness adjustment amount can be determined according to the current pole piece thickness and the preset target pole piece thickness. This implementation has high calculation efficiency and can quickly obtain the thickness adjustment amount and perform thickness adjustment.

[0095] As another optional implementation, the thickness adjustment amount can be determined based on the current pole piece thickness, the historical pole piece thickness within a preset period, and the preset target pole piece thickness. This implementation can avoid the current pole piece thickness being invalid due to distortion in pole piece thickness measurement or other factors, thereby causing a large deviation in the thickness adjustment amount.

[0096] The thickness adjustment amount may be a thickness change amount based on the current pole piece thickness. For example, if the current pole piece thickness is 1 micron and the thickness adjustment amount is 0.1 micron, the target pole piece thickness is 1.1 micron, and if the thickness adjustment amount is -0.1 micron, the target pole piece thickness is 0.9 micron.

[0097] The historical pole piece thickness is the average value of the pole piece thickness obtained in the preset period before the current moment. For example, the preset period is 1 minute, and the pole piece thickness is obtained every 5 seconds in the preset period, then the historical pole piece thickness is the average value of the pole piece thickness collected within 1 minute before the current moment.

[0098] The thickness deviation interval may be a deviation interval pre-set based on the target pole piece thickness, and the pole piece thicknesses within the thickness deviation interval all meet the process requirements. For example, the thickness deviation interval may be ±0.05 micrometers.

[0099] Optionally, the speed-up signal is used to increase the roller speed, thereby improving work efficiency.

[0100] It is worth noting that there is a time deviation between the actually controlled rolling speed and the measured rolling speed, and the time deviation is related to the distance between the modules for controlling the rolling speed and measuring the rolling speed. Therefore, the distance between the modules for controlling the rolling speed and measuring the rolling speed can be recorded in meters, and the time error can be eliminated according to the recorded value, that is, the thickness adjustment amount can be delayed in calculation based on the recorded value.

[0101] S103, unwinding the electrode and collecting the unwinding diameter.

[0102] Optionally, multiple unwinding diameter intervals can be pre-set, and the unwinding diameter intervals correspond to multiple speed thresholds. The speed threshold corresponding to the current unwinding diameter is determined according to the multiple speed thresholds and the current unwinding diameter, so as to control the rolling speed according to the speed threshold corresponding to the current unwinding diameter.

[0103] It should be understood that during the electrode unwinding process, the unwinding diameter gradually decreases from large to small. When the unwinding diameter approaches 0, the unwinding is about to reach the bottom. At this time, the electrode rolling speed should be gradually reduced to 0 until it stops, so that the electrode rolling process is smooth.

[0104] S104, rolling up the pole piece and collecting the rolling diameter.

[0105] Optionally, multiple unwinding diameter intervals can be pre-set, and the unwinding diameter intervals correspond to multiple speed thresholds. The speed threshold corresponding to the current unwinding diameter is determined according to the multiple speed thresholds and the current unwinding diameter, so as to control the rolling speed according to the speed threshold corresponding to the current unwinding diameter.

[0106] It should be understood that during the electrode unwinding process, the unwinding diameter gradually decreases from large to small. When the unwinding diameter approaches 0, the unwinding is about to reach the bottom. At this time, the electrode rolling speed should be gradually reduced to 0 until it stops, so that the electrode rolling process is smooth.

[0107] Optionally, multiple winding diameter intervals may be pre-set, and the winding diameter intervals correspond to multiple speed thresholds. The speed threshold corresponding to the current winding diameter is determined according to the multiple speed thresholds and the current winding diameter, so as to control the roller speed according to the speed threshold corresponding to the current winding diameter. It is worth noting that the multiple winding diameter intervals may correspond to the multiple unwinding diameter intervals respectively to determine the speed threshold. Specifically, the largest unwinding diameter interval may correspond to the smallest winding diameter interval and correspond to a speed threshold.

[0108] It should be understood that during the electrode material rewinding process, the winding diameter gradually increases from small to large. When the winding diameter approaches the preset maximum winding value, the winding is about to end. At this time, the electrode rolling speed should be gradually reduced to 0 until it stops, so that the electrode rolling process is smooth and there will be no uneven rolling thickness.

[0109] S105, adjusting the roller pressure value based on the thickness adjustment amount, and adjusting the roller speed based on the winding diameter, the unwinding diameter, the roller speed and the speed increase signal.

[0110] It is worth noting that at the beginning of rolling, the rolling pressure value and the rolling speed are preset values, and then the above steps S102-S105 can be executed cyclically, so as to adjust the rolling pressure value and the rolling speed according to the cycle, and perform rolling according to the adjusted rolling pressure value and the adjusted rolling speed. After the rolling starts, the rolling pressure value and the rolling speed are determined according to the unwinding reel diameter, the winding reel diameter and the electrode thickness obtained in the previous cycle. Among them, the previous cycle is the moment before the preset cycle length at the current moment. The preset cycle length can be determined according to the moving speed of the electrode.

[0111] Optionally, the rolling pressure value can be adjusted based on the PLC according to the thickness adjustment amount, specifically, the rolling pressure value and rolling parameters of the pole piece can be adjusted. The rolling parameters can be, for example, the spacing of the roller gap used for rolling.

[0112] Optionally, a speed threshold may be determined based on the winding diameter interval corresponding to the winding diameter and the unwinding diameter interval corresponding to the unwinding diameter, and then the rolling speed is adjusted according to the speed threshold, the rolling speed and the speed-up signal. As an optional implementation, it is determined whether the rolling speed is less than the speed threshold. If so, the rolling speed is adjusted according to the rolling speed and the speed-up signal. Specifically, if the speed-up signal is set to 1, the rolling speed is increased, and if the speed-up signal is set to 0, the rolling speed is maintained.

[0113] It is worth noting that the thickness adjustment amount is the current thickness adjustment amount, and the time to adjust the roller pressure value according to the thickness adjustment amount is after the current time. Similarly, the winding diameter, unwinding diameter, roller speed and speed-up signal used in calculating the roller speed are all data at the current time, and the time to adjust the roller speed is after the current time.

[0114] In this embodiment, while the pole piece is unwinding and rewinding, the current pole piece thickness of the pole piece after rolling is collected, and the thickness adjustment amount is determined according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness, so that the rolling pressure value is adjusted according to the thickness adjustment amount, so that the pole piece thickness gradually approaches the target pole piece thickness, avoiding the problem of uneven pole piece thickness. In addition, a speed-up signal is generated according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the thickness deviation range, the rolling speed and the maximum speed, so that the rolling speed is adjusted based on the winding diameter, the unwinding diameter, the rolling speed and the speed-up signal, so as to improve the work efficiency while ensuring the uniform thickness of the pole piece. In the pole piece rolling control process, no manual intervention is required, thus saving manpower.

[0115] Further, refer to Figure 2 The specific process of determining the thickness adjustment amount according to the current electrode thickness, the historical electrode thickness within a preset period, and the preset target electrode thickness in step S102 is introduced. Figure 2 It is a schematic diagram of a process for determining a thickness adjustment amount provided in an embodiment of the present application.

[0116] S201, obtaining a preset first coefficient, a second coefficient, and a third coefficient, wherein the first coefficient is used to characterize a proportional gain, the second coefficient is used to characterize an integral time, and the third coefficient is used to characterize a differential time.

[0117] The first coefficient, the second coefficient and the third coefficient are all preset values. Specifically, before the initial rolling, the first coefficient, the second coefficient and the third coefficient are set.

[0118] S202, determining a current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness.

[0119] Optionally, the current thickness difference may be the difference between the average value of the electrode thickness at the current moment and in a preset period before the current moment and the target electrode thickness. As an optional implementation, the sum of the current electrode thickness and the historical electrode thickness is divided by 2, and the difference between the obtained quotient and the target electrode thickness is used as the current thickness difference.

[0120] S203: Determine the integral value of the current thickness difference, and take the product of the reciprocal of the second coefficient and the integral value as the first intermediate value.

[0121] Specifically, the integral value of the current thickness difference from the control start time to the current time is determined.

[0122] Optionally, the first intermediate value is an integral control value for eliminating steady-state errors. As time goes by, the integral control value gradually increases.

[0123] S204: Determine a differential value of the current thickness difference, and use the product of the third coefficient and the differential value as the second intermediate value.

[0124] Optionally, the second intermediate value is a differential control value, and the differential control value can overcome the oscillation or even imbalance problem occurring during the regulation process by predicting the error variation trend.

[0125] S205 , taking the sum of the current thickness difference, the first intermediate value, and the second intermediate value as the third intermediate value.

[0126] Optionally, the third intermediate value is used to represent the thickness value after the current thickness difference is adjusted by integral control and differential control.

[0127] S206: Calculate the product of the third intermediate value and the first coefficient to obtain a thickness adjustment amount.

[0128] Specifically, the third intermediate value is multiplied by the first coefficient to further perform proportional control on the thickness value after integral control and differential control, thereby overcoming the deviation in the thickness adjustment process as a whole.

[0129] Specifically, the process of determining the thickness adjustment amount can be as follows:

[0130]

[0131] Among them, K p is the first coefficient, T t is the second coefficient, t is the current time, T D is the third coefficient, e(t) is the current thickness difference, and u(t) is the thickness adjustment amount.

[0132] Optionally, this embodiment adopts a differential-first method to avoid the impact caused by changing the rolling pressure, the roll gap size, the rolling speed and the rolling state.

[0133] In this embodiment, the first coefficient, the second coefficient and the third coefficient are pre-set, and the integral value and the differential value of the current thickness difference are determined after the current pole piece difference is determined. Thus, the steady-state error is eliminated and the oscillation and imbalance problems are overcome during the adjustment process. Then, the first intermediate value and the second intermediate value are calculated, and the sum of the current thickness difference, the first intermediate value and the second intermediate value is used as the third intermediate value, and the product of the third intermediate value and the first coefficient is used as the thickness adjustment amount, so that a stable and reliable thickness adjustment amount is output in sequence in time order, so as to adjust the roller pressure value based on the thickness adjustment amount.

[0134] Furthermore, the specific process of determining the current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness in the above step S202 includes the following steps:

[0135] Optionally, a weighted average is calculated for the current pole piece thickness and the historical pole piece thickness to obtain the thickness to be adjusted.

[0136] Specifically, the product of the historical electrode thickness and the number of thickness measurements in a preset period is calculated to obtain a product value. The number of thickness measurements in the preset period is the number of times the electrode thickness is measured in the preset period. The sum of the product value and the current electrode thickness is calculated, and the quotient of the sum and the number of thickness statistics in the preset period plus 1 is used as the thickness to be adjusted.

[0137] For example, if the current thickness is 10 microns, the historical electrode thickness is 11 microns, and the number of thickness measurements within the preset time period is 9 times, then the thickness to be adjusted is 10.9 microns.

[0138] Optionally, the difference between the thickness to be adjusted and the target pole piece thickness is used as the current thickness difference.

[0139] For example, if the thickness to be adjusted is 10.9 microns and the target pole piece thickness is 10 microns, the current thickness difference is 0.9 microns; if the target pole piece thickness is 11 microns, the current thickness difference is -0.1 microns.

[0140] In this embodiment, the weighted average of the current pole piece thickness and the historical pole piece thickness is calculated, and the difference between the thickness to be adjusted and the target pole piece thickness is used as the current thickness difference, thereby ensuring that the current thickness difference is a value that changes steadily over time, and there will be no sudden change that causes uneven pole piece thickness.

[0141] Furthermore, in the above step S102, the specific process of generating the speed-up signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the thickness deviation range, the rolling speed and the preset maximum speed includes:

[0142] Optionally, if the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

[0143] If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, it means that the pole piece thickness at the current moment and in the preset period before the current moment meets the user's requirements. Therefore, the speed can be increased to improve work efficiency.

[0144] However, since the roller speed needs to be reduced when the unwinding roll is at the bottom and the winding material is full, the maximum speed needs to be set. Then, when the difference is within the thickness deviation range and the speed is less than the maximum speed, a speed increase signal is generated to increase the roller speed.

[0145] The maximum speed may be a first speed threshold, a second speed threshold, a third speed threshold or a fourth speed threshold, wherein the first speed threshold, the second speed threshold, the third speed threshold and the fourth speed threshold correspond to each winding diameter interval and the unwinding diameter interval respectively.

[0146] In this embodiment, by judging whether the difference between the current pole piece thickness and the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and whether the rolling speed is less than the maximum speed, a speed increase signal is generated to achieve efficient operation while ensuring the consistency of the pole piece rolling thickness.

[0147] Next, how to set the first speed threshold, the second speed threshold, the third speed threshold and the fourth speed threshold in the above process, and how to adjust the roller speed based on the winding diameter, the unwinding diameter, the roller speed and the speed-up signal in the above step S105 are introduced. Figure 3 It is a schematic diagram of a process for adjusting the rolling speed provided in an embodiment of the present application.

[0148] S301. If the winding diameter is in the first winding diameter interval and the unwinding diameter is in the first unwinding diameter interval, determine the first speed threshold corresponding to the first unwinding diameter interval, and adjust the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information.

[0149] As an optional implementation, the first winding diameter interval corresponds to the first unwinding diameter interval and corresponds to a preset first speed threshold. Exemplarily, the first speed threshold may be 90 meters per second.

[0150] It is worth noting that when the pole piece rolling is just started, the rolling can be performed at a preset starting speed. For example, the preset starting speed can be a speed less than 10 meters per second.

[0151] Optionally, the speed adjustment information may define a roller speed adjustment method within a period of time.

[0152] S302. If the winding diameter is in the second winding diameter interval and the unwinding diameter is in the second unwinding diameter interval, determine the second speed threshold corresponding to the second unwinding diameter interval, and adjust the rolling speed according to the rolling speed, the second speed threshold and the speed adjustment information. The diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold.

[0153] Optionally, if the winding diameter is in the second winding diameter interval and the unwinding diameter is in the second unwinding diameter interval, it means that the current unwinding process and winding process are close to completion. At this time, it is necessary to control the roller speed to gradually decrease, so a second speed threshold corresponding to the second winding diameter interval and the second unwinding diameter area is pre-set, and the second speed threshold is less than the first speed threshold. Exemplarily, the second speed threshold may be 60 meters per second.

[0154] S303. If the winding diameter is in the third winding diameter interval and the unwinding diameter is in the third unwinding diameter interval, determine the third speed threshold corresponding to the third unwinding diameter interval, and adjust the rolling speed according to the rolling speed, the third speed threshold and the speed adjustment information. The diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold.

[0155] Optionally, if it is determined that the winding diameter is in the third winding diameter interval and the unwinding diameter is in the third unwinding diameter interval, it means that the current unwinding process and the winding process are further approaching the end. At this time, it is necessary to control the roller speed to be further reduced, so a third speed threshold corresponding to the third winding diameter interval and the third unwinding diameter area is pre-set, and the third speed threshold is less than the second speed threshold. Exemplarily, the third speed threshold may be 40 meters per second.

[0156] S304. If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, determine the fourth speed threshold corresponding to the fourth unwinding diameter interval, and adjust the rolling speed according to the rolling speed, the fourth speed threshold and the speed adjustment information. The diameter in the fourth winding diameter interval is greater than the diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

[0157] Optionally, if it is determined that the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, it means that the current unwinding process and the winding process are about to end. At this time, it is necessary to control the roller speed to be further reduced, so a fourth speed threshold corresponding to the fourth winding diameter interval and the fourth unwinding diameter area is pre-set, and the fourth speed threshold is less than the third speed threshold. Exemplarily, the fourth speed threshold may be 20 meters per second.

[0158] It is worth noting that a fifth winding diameter can be set. If the winding diameter is the fifth winding diameter, the rolling is stopped within a preset time period, and the winding and unwinding are stopped.

[0159] It is worth noting that the first speed threshold, the second speed threshold, the third speed threshold and the fourth speed threshold can all be pre-set according to the actual rolling scenario, and this application does not impose any limitation thereto.

[0160] As an optional implementation, Figure 4 1 is a schematic diagram of the interval of the winding diameter and the unwinding diameter provided in the embodiment of the present application. Figure 4 As shown, the length of the first winding diameter interval is greater than the sum of the lengths of the second winding diameter interval, the third winding diameter interval, and the fourth winding diameter interval, and the length of the first unwinding diameter interval is greater than the sum of the lengths of the second unwinding diameter interval, the third unwinding diameter interval, and the fourth unwinding diameter interval. Therefore, when the winding diameter and the unwinding diameter are in the first winding diameter interval and the first unwinding diameter interval, respectively, there is enough time to increase the rolling speed to the first speed threshold, thereby improving the rolling work efficiency.

[0161] It is worth noting that when the winding diameter and the unwinding diameter are at the critical values ​​of each diameter interval, since each diameter interval corresponds to a different speed threshold, the speed can be reduced according to a pre-set speed reduction strategy. The speed reduction strategy can be to reduce the speed according to a preset acceleration, or to reduce the roller speed to the speed threshold within a preset time.

[0162] For example, Figure 5 Schematic diagram of a speed reduction process provided by an embodiment of the present application. Figure 5As shown, when the winding diameter and the unwinding diameter are respectively located in the first winding diameter interval and the first unwinding diameter interval, the roller speed can be at most the first speed threshold. When the winding diameter and the unwinding diameter are respectively located in the second winding diameter interval and the second unwinding diameter interval, the roller speed is reduced to the second speed threshold. When the winding diameter and the unwinding diameter are respectively located in the third winding diameter interval and the third unwinding diameter interval, the roller speed is reduced to the third speed threshold. When the winding diameter and the unwinding diameter are respectively located in the fourth winding diameter interval and the fourth unwinding diameter interval, the roller speed is reduced to the fourth speed threshold. When the winding diameter and the unwinding diameter are respectively located in the fifth winding diameter interval and the fifth unwinding diameter interval, the roller speed is reduced to 0.

[0163] As another optional implementation, the process of adjusting the roller speed based on the winding diameter, the unwinding diameter, the roller speed and the speed-up signal may also be the following steps:

[0164] If the winding diameter is in the first winding diameter interval and the unwinding diameter is in the first unwinding diameter interval, the first speed threshold corresponding to the first unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the first speed threshold and the speed adjustment information, and the rolling speed does not exceed the first speed threshold.

[0165] If the winding diameter is in the second winding diameter interval and the unwinding diameter is in the second unwinding diameter interval, the second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is reduced according to the speed reduction strategy until the rolling speed is reduced to the second speed threshold.

[0166] If the winding diameter is in the third winding diameter interval and the unwinding diameter is in the third unwinding diameter interval, the third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is reduced according to the speed reduction strategy until the rolling speed is reduced to the third speed threshold.

[0167] If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the roller speed is adjusted to be reduced according to the speed reduction strategy, first reducing the roller speed to the fourth speed threshold and reducing it to 0 within a preset period of time.

[0168] In this embodiment, the speed thresholds corresponding to multiple diameter intervals are determined by the diameter intervals corresponding to the winding diameter and the unwinding diameter, so that the rolling speed is adjusted in turn according to the rolling speed, speed threshold and speed adjustment information, thereby controlling the rolling speed to ensure that the rolling speed is increased while the electrode thickness is uniform, thereby improving work efficiency, and reducing the rolling speed when the winding and unwinding of the coil is about to end, so as to avoid large fluctuations in the rolling process that affect the rolling effect.

[0169] As an optional implementation, the speed adjustment information in the above steps S301-S304 includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to the speed threshold, and the speed threshold includes a first speed threshold, a second speed threshold, a third speed threshold or a fourth speed threshold.

[0170] The adjustment step amount is used to indicate the number of adjustments required from the rolling speed to the first speed threshold, the second speed threshold, the third speed threshold, and the fourth speed threshold. For example, if the rolling speed is 30 meters per second, the second speed threshold is 40 meters per second, and 10 adjustments are required to gradually increase the rolling speed to the second speed threshold, the adjustment step amount is 10. It is worth noting that the number of adjustments may refer to the number of times the thickness adjustment amount is calculated.

[0171] Based on this, refer to Figure 6 In the above step S301, the specific steps of adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information are as follows. Figure 6 It is a flow chart of a method for adjusting rolling speed provided in an embodiment of the present application.

[0172] S601: Calculate the difference between the first speed threshold and the rolling speed.

[0173] Specifically, the difference between the first speed threshold and the rolling speed is calculated. For example, the first speed threshold may be 60 meters per second to 90 meters per second, and the difference between 90 meters per second and the rolling speed is calculated.

[0174] S602: Calculate the ratio of the difference to the adjustment step amount.

[0175] Optionally, if the rolling speed is equal to the first speed threshold, the ratio is 0.

[0176] S603, taking the ratio as the adjusted rolling speed.

[0177] Optionally, the ratio is used as the adjusted rolling speed, so that the rolling speed is gradually increased until it reaches a first speed threshold.

[0178] In this embodiment, the difference between the first speed threshold and the rolling speed is calculated, and the ratio of the difference to the adjustment step amount is used as the adjusted rolling speed, so that the rolling speed gradually reaches the first speed threshold, ensuring a smooth change in the pole piece rolling speed.

[0179] As another optional implementation, the speed adjustment information in the above steps S301-S304 includes: a unit adjustment amount, wherein the unit adjustment amount is used to indicate the adjustment amount of a single adjustment of the rolling speed.

[0180] Optionally, the sum of the rolling speed and the unit adjustment amount is taken as the adjusted rolling speed.

[0181] The unit adjustment amount may be a constant value of speed change. For example, the unit adjustment amount is 2 meters per second. If the roller speed is 45 meters per second, the adjusted roller speed is 47 meters per second.

[0182] In this embodiment, the sum of the rolling speed and the unit adjustment amount is taken as the adjusted rolling speed, so that the rolling speed gradually reaches the first speed threshold, thereby ensuring smooth changes in the pole piece rolling speed.

[0183] As an optional implementation, Figure 7 Schematic diagram of a method for increasing speed provided in an embodiment of the present application. Figure 7 As shown, when the pole piece rolling starts, the pole piece is rolled at a preset rolling speed, and the preset rolling speed can be, for example, less than 10 meters per second. During the rolling process, the winding diameter interval and the unwinding diameter interval where the winding diameter and the unwinding diameter are located are judged in real time, and the speed thresholds corresponding to the winding diameter interval and the unwinding diameter interval are determined, and the speed threshold can be a first speed threshold, for example, 60 meters per second. During the rolling control process, if a speed increase signal is generated, the adjusted speed is calculated according to the rolling speed and the speed adjustment information, and the speed is adjusted according to the adjusted speed. The adjusted speed can be 30 meters per second. If a speed increase signal is generated for the second time, the adjusted speed is calculated according to the rolling speed and the speed adjustment information, and the speed is adjusted according to the adjusted speed. The adjusted speed can be 60 meters per second. It is judged in turn whether a speed increase signal is generated and the speed is increased based on the speed increase signal until the rolling speed reaches the speed threshold.

[0184] As an optional implementation, if the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, an alarm signal is output.

[0185] Among them, if the difference between the current electrode thickness and the preset target electrode thickness is not within the thickness deviation range, and the difference between the historical electrode thickness and the preset target electrode thickness is not within the thickness deviation range, it means that the first coefficient, the second coefficient, the third coefficient and the rolling pressure setting method of the currently calculated thickness adjustment amount cannot make the electrode meet the preset thickness requirements. Therefore, it is necessary to remind the staff through an alarm signal so that the staff can adjust the first coefficient, the second coefficient, the third coefficient and the rolling pressure setting method to improve the current situation.

[0186] This embodiment also provides a pole piece rolling control device. The specific structure of the pole piece rolling control device is as follows: Figure 8 As shown, Figure 8It is a structural schematic diagram of a pole piece rolling control device provided in an embodiment of the present application. The pole piece rolling device includes an unwinding module, a rolling module, a thickness measuring module and a winding module. Among them, the unwinding module is connected to the rolling module, the thickness measuring module is connected to the rolling module, and the winding module is connected to the rolling module. The unwinding module, the rolling module, the thickness measuring module and the winding module are arranged in sequence, and each module can be connected to each other by wired or wireless communication. The unwinding module and the winding module both include coil and coil diameter sensors. The rolling module deploys a programmable logic controller (PLC), as well as an upper hydraulic servo valve, a lower hydraulic servo valve, an upper rolling roller and a lower rolling roller. The upper hydraulic servo valve is mechanically connected to the upper rolling roller, and the lower hydraulic servo valve is mechanically connected to the lower rolling roller. The thickness measuring module includes an upper thickness measuring probe and a lower thickness measuring probe.

[0187] The rolling module is used to roll the pole piece according to a preset rolling pressure value and a preset rolling speed;

[0188] Specifically, the PLC in the rolling module can control the upper hydraulic servo valve and the lower hydraulic servo valve in the rolling module to apply pressure to the upper rolling roller and the lower rolling roller respectively according to the rolling pressure value, so as to control the roll gap between the upper rolling roller and the lower rolling roller to roll the pole piece, and control the rolling speed of the upper rolling roller and the lower rolling roller according to the rolling speed.

[0189] The thickness measurement module is used to collect the current pole piece thickness of the pole piece after rolling, and determine the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness, and generate a speed increase signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation range, the rolling speed and the preset maximum speed.

[0190] Specifically, the thickness measuring module measures the thickness of the rolled pole piece through an upper thickness measuring probe and a lower thickness measuring probe. Specifically, the upper thickness measuring probe and the lower thickness measuring probe can scan the cross section of the pole piece to obtain the thickness of the pole piece.

[0191] The unwinding module is used to unwind the pole piece and collect the unwinding diameter;

[0192] The winding module is used to wind up the pole piece and collect the winding diameter.

[0193] The roller pressing module is also used to adjust the roller pressing pressure value based on the thickness adjustment amount, and to adjust the roller pressing speed based on the winding diameter, the unwinding diameter, the roller pressing speed and the speed increase signal.

[0194] Optionally, the thickness measurement module is specifically used for:

[0195] A preset first coefficient, a second coefficient and a third coefficient are obtained, wherein the first coefficient is used to characterize the proportional gain, the second coefficient is used to characterize the integral time, and the third coefficient is used to characterize the differential time.

[0196] The current thickness difference is determined based on the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness.

[0197] An integral value of the current thickness difference is determined, and a product of the reciprocal of the second coefficient and the integral value is taken as a first intermediate value.

[0198] A differential value of the current thickness difference is determined, and a product of the third coefficient and the differential value is used as the second intermediate value.

[0199] The sum of the current thickness difference, the first intermediate value, and the second intermediate value is taken as the third intermediate value.

[0200] The product of the third intermediate value and the first coefficient is calculated to obtain the thickness adjustment amount.

[0201] Optionally, the thickness measurement module is specifically used for:

[0202] The current pole piece thickness and the historical pole piece thickness are weighted and averaged to obtain the thickness to be adjusted.

[0203] The difference between the thickness to be adjusted and the target electrode thickness is taken as the current thickness difference.

[0204] Optionally, the thickness measurement module is specifically used for:

[0205] If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

[0206] Optionally, the rolling module is specifically used for:

[0207] If the winding diameter is in the first winding diameter interval and the unwinding diameter is in the first unwinding diameter interval, the first speed threshold corresponding to the first unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the first speed threshold and the speed adjustment information.

[0208] If the winding diameter is in the second winding diameter interval and the unwinding diameter is in the second unwinding diameter interval, the second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the second speed threshold and the speed adjustment information. The diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold.

[0209] If the winding diameter is in the third winding diameter interval and the unwinding diameter is in the third unwinding diameter interval, the third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the third speed threshold and the speed adjustment information. The diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold.

[0210] If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the fourth speed threshold corresponding to the fourth unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the fourth speed threshold and the speed adjustment information, the winding diameter in the fourth winding diameter interval is greater than the winding diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

[0211] Optionally, the speed adjustment information includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to a speed threshold, and the speed threshold includes a first speed threshold, a second speed threshold, a third speed threshold or a fourth speed threshold.

[0212] The roller pressing module is specifically used for:

[0213] The difference between the first speed threshold and the rolling speed is calculated.

[0214] Calculate the ratio of the difference to the adjustment step amount.

[0215] The ratio is taken as the adjusted roller speed.

[0216] Optionally, the speed adjustment information includes: a unit adjustment amount, wherein the unit adjustment amount is used to represent an adjustment amount for a single adjustment of the rolling speed.

[0217] The roller pressing module is specifically used for:

[0218] The sum of the roller pressing speed and the unit adjustment amount is taken as the adjusted roller pressing speed.

[0219] Optionally, the roller pressing module is also used for:

[0220] If the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, an alarm signal is output.

[0221] Optionally, the thickness measurement module is specifically used for:

[0222] A preset first coefficient, a second coefficient and a third coefficient are obtained, wherein the first coefficient is used to characterize the proportional gain, the second coefficient is used to characterize the integral time, and the third coefficient is used to characterize the differential time.

[0223] The current thickness difference is determined based on the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness.

[0224] An integral value of the current thickness difference is determined, and a product of the reciprocal of the second coefficient and the integral value is taken as a first intermediate value.

[0225] A differential value of the current thickness difference is determined, and a product of the third coefficient and the differential value is used as the second intermediate value.

[0226] The sum of the current thickness difference, the first intermediate value, and the second intermediate value is taken as the third intermediate value.

[0227] The product of the third intermediate value and the first coefficient is calculated to obtain the thickness adjustment amount.

[0228] Optionally, the thickness measurement module is specifically used for:

[0229] The current pole piece thickness and the historical pole piece thickness are weighted and averaged to obtain the thickness to be adjusted.

[0230] The difference between the thickness to be adjusted and the target electrode thickness is taken as the current thickness difference.

[0231] Optionally, the thickness measurement module is specifically used for:

[0232] If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

[0233] Optionally, the rolling module is specifically used for:

[0234] If the winding diameter is in the first winding diameter interval and the unwinding diameter is in the first unwinding diameter interval, the first speed threshold corresponding to the first unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the first speed threshold and the speed adjustment information.

[0235] If the winding diameter is in the second winding diameter interval and the unwinding diameter is in the second unwinding diameter interval, the second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the second speed threshold and the speed adjustment information. The diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold.

[0236] If the winding diameter is in the third winding diameter interval and the unwinding diameter is in the third unwinding diameter interval, the third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the third speed threshold and the speed adjustment information. The diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold.

[0237] If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the fourth speed threshold corresponding to the fourth unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the fourth speed threshold and the speed adjustment information, the winding diameter in the fourth winding diameter interval is greater than the winding diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

[0238] Optionally, the speed adjustment information includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to a speed threshold, and the speed threshold includes a first speed threshold, a second speed threshold, a third speed threshold or a fourth speed threshold.

[0239] The roller pressing module is specifically used for:

[0240] The difference between the first speed threshold and the rolling speed is calculated.

[0241] Calculate the ratio of the difference to the adjustment step amount.

[0242] The ratio is taken as the adjusted roller speed.

[0243] Optionally, the speed adjustment information includes: a unit adjustment amount, wherein the unit adjustment amount is used to represent an adjustment amount for a single adjustment of the rolling speed.

[0244] The roller pressing module is specifically used for:

[0245] The sum of the roller pressing speed and the unit adjustment amount is taken as the adjusted roller pressing speed.

[0246] Optionally, the roller pressing module is also used for:

[0247] If the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation range, an alarm signal is output.

[0248] Optionally, the rolling module sends a heartbeat signal to the thickness measuring module according to a preset time period, and receives a response signal sent by the thickness measuring module, wherein the response signal is used to indicate that the rolling module and the thickness measuring module can communicate normally.

[0249] Among them, the heartbeat signal can be a signal to be confirmed. After receiving the heartbeat signal, the thickness measuring module sends a response signal to the rolling module according to a preset time period to ensure that the rolling module and the thickness measuring module can communicate normally to ensure work efficiency.

[0250] As an optional implementation, the rolling module sends information such as rolling pressure, roll gap size, rolling speed and rolling state to the thickness measurement module according to a preset time period as a pre-adjustment reference value. The pre-adjustment reference value is used for the thickness measurement module to calculate the current thickness adjustment amount when the above information does not change.

[0251] As another optional implementation, after receiving the thickness adjustment amount and / or speed increase signal sent by the thickness measuring module, the rolling module sends a confirmation reception mark information to the thickness measuring module, so that the thickness measuring module determines that the rolling module has successfully received the thickness adjustment amount and / or speed increase signal.

[0252] As an optional implementation, Fig. 9 It is a flow chart of another pole piece rolling control method provided in an embodiment of the present application. The winding module collects the winding roll diameter in real time while winding and sends it to the PLC of the rolling module. The unwinding module collects the unwinding roll diameter in real time while unwinding and sends it to the PLC of the rolling module. The thickness measuring module determines the thickness adjustment amount and the speed increase signal and sends them to the PLC of the rolling module. The PLC of the rolling module adjusts the rolling pressure value according to the thickness adjustment amount, and adjusts the rolling speed according to the winding roll diameter, the unwinding roll diameter, the rolling speed and the speed increase signal. When the unwinding roll diameter is about to reach the bottom of the unwinding roll, and the winding roll diameter is about to be full of winding material, the rolling module stops and alarms for manual intervention.

[0253] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A pole piece rolling control method, characterized in that: The method comprises: Rolling the pole piece according to a preset rolling pressure value and a preset rolling speed; Collecting the current pole piece thickness of the pole piece after rolling, and determining the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness, and generating a speed increase signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed; Unwinding the pole piece and collecting the unwinding diameter; Rolling up the pole piece and collecting the winding diameter; The roller pressure value is adjusted based on the thickness adjustment amount, and the roller speed is adjusted based on the winding diameter, the unwinding diameter, the roller speed and the speed increase signal.

2. The pole piece rolling control method according to claim 1, characterized in that: The determining of the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset period of time and the preset target pole piece thickness includes: Obtaining a preset first coefficient, a second coefficient, and a third coefficient, wherein the first coefficient is used to characterize a proportional gain, the second coefficient is used to characterize an integral time, and the third coefficient is used to characterize a differential time; Determine a current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness; determining an integral value of the current thickness difference, and taking a product of a reciprocal of the second coefficient and the integral value as a first intermediate value; determining a differential value of the current thickness difference, and taking a product of the third coefficient and the differential value as a second intermediate value; taking the sum of the current thickness difference, the first intermediate value and the second intermediate value as a third intermediate value; The product of the third intermediate value and the first coefficient is calculated to obtain the thickness adjustment amount.

3. The pole piece rolling control method according to claim 2, characterized in that: The determining the current thickness difference according to the current pole piece thickness, the historical pole piece thickness and the target pole piece thickness includes: Performing weighted average calculation on the current pole piece thickness and the historical pole piece thickness to obtain the thickness to be adjusted; The difference between the thickness to be adjusted and the target pole piece thickness is taken as the current thickness difference.

4. The pole piece rolling control method according to claim 1, characterized in that: The generating of the speed-up signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed includes: If the difference between the current pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the difference between the historical pole piece thickness and the target pole piece thickness is within the thickness deviation range, and the rolling speed is less than the maximum speed, a speed increase signal is generated.

5. The pole piece rolling control method according to claim 1, characterized in that: The adjusting the rolling speed based on the winding diameter, the unwinding diameter, the rolling speed and the speed increase signal comprises: If the winding diameter is in a first winding diameter interval and the unwinding diameter is in a first unwinding diameter interval, determining a first speed threshold corresponding to the first unwinding diameter interval, and adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information; If the winding diameter is in the second winding diameter interval, and the unwinding diameter is in the second unwinding diameter interval, a second speed threshold corresponding to the second unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the second speed threshold and the speed adjustment information, the diameter in the second winding diameter interval is greater than the diameter in the first unwinding diameter interval, and the second speed threshold is less than the first speed threshold; If the winding diameter is in the third winding diameter interval, and the unwinding diameter is in the third unwinding diameter interval, a third speed threshold corresponding to the third unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the third speed threshold and the speed adjustment information, the diameter in the third winding diameter interval is greater than the diameter in the second unwinding diameter interval, and the third speed threshold is less than the second speed threshold; If the winding diameter is in the fourth winding diameter interval and the unwinding diameter is in the fourth unwinding diameter interval, the fourth speed threshold corresponding to the fourth unwinding diameter interval is determined, and the rolling speed is adjusted according to the rolling speed, the fourth speed threshold and the speed adjustment information, the diameter in the fourth winding diameter interval is greater than the diameter in the third unwinding diameter interval, and the fourth speed threshold is less than the third speed threshold.

6. The pole piece rolling control method according to claim 5, characterized in that: The speed adjustment information includes: an adjustment step amount, wherein the adjustment step amount is used to indicate the number of adjustments required from the rolling speed to the speed threshold, and the speed threshold includes the first speed threshold, the second speed threshold, the third speed threshold or the fourth speed threshold; The adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information includes: Calculating a difference between the first speed threshold and the rolling speed; Calculating a ratio of the difference to the adjustment step amount; The ratio is taken as the adjusted rolling speed.

7. The pole piece rolling control method according to claim 5, characterized in that: The speed adjustment information includes: a unit adjustment amount, wherein the unit adjustment amount is used to represent the adjustment amount of a single adjustment of the rolling speed; The adjusting the rolling speed according to the rolling speed, the first speed threshold and the speed adjustment information includes: The sum of the rolling speed and the unit adjustment amount is taken as the adjusted rolling speed.

8. The pole piece rolling control method according to claim 1, characterized in that: The method further comprises: If the difference between the current pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, and the difference between the historical pole piece thickness and the preset target pole piece thickness is not within the thickness deviation interval, an alarm signal is output.

9. A pole piece rolling device, characterized in that: The device comprises an unwinding module, a rolling module, a thickness measuring module and a winding module, wherein the unwinding module is connected to the rolling module, the thickness measuring module is connected to the rolling module, and the winding module is connected to the rolling module; The rolling module is used to roll the pole piece according to a preset rolling pressure value and a preset rolling speed; The thickness measuring module is used to collect the current pole piece thickness of the pole piece after rolling, and determine the thickness adjustment amount according to the current pole piece thickness, the historical pole piece thickness within a preset time period and the preset target pole piece thickness, and generate a speed increase signal according to the current pole piece thickness, the historical pole piece thickness, the target pole piece thickness, the preset thickness deviation interval, the rolling speed and the preset maximum speed; The unwinding module is used to unwind the pole piece and collect the unwinding diameter; The winding module is used to wind up the pole piece and collect the winding diameter; The rolling module is further used to adjust the rolling pressure value based on the thickness adjustment amount, and to adjust the rolling speed based on the winding diameter, the unwinding diameter, the rolling speed and the speed increase signal.

10. The pole piece rolling device according to claim 9, characterized in that: The rolling module is also used to send a heartbeat signal to the thickness measuring module according to a preset time period, and receive a response signal sent by the thickness measuring module, wherein the response signal is used to indicate that the rolling module and the thickness measuring module can communicate normally.

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