Roller surface thermal crown control method and device, electronic equipment and readable storage medium

Abstract

The invention relates to a roller surface thermal crown control method and device, electronic equipment and a readable storage medium. The method comprises the steps that target parameters and roller surface parameters are obtained, and the thermal crown regulation and control state of a roller is determined; when the thermal crown regulation and control state does not meet the condition, regulating and controlling medium parameters of the first fluid medium and the second fluid medium through a preset regulation and control strategy and the target parameters; wherein the medium parameters at least comprise a flow value and a temperature value. According to the scheme provided by the invention, the dynamic regulation and control of the thermal convexity of the roller surface can be realized, the problem of poor adaptability caused by the fixed roller surface radian of a traditional prefabricated radian roller is effectively solved, the roller can flexibly meet the production requirements of different pole pieces, the production cost is further effectively reduced, and the pole piece rolling production efficiency is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery electrode rolling, and particularly to a method and device for controlling the thermal crown of a roll surface, an electronic device, and a readable storage medium. Background Art

[0002] With the popularization of the application of lithium batteries in society, users have put forward higher requirements for the performance of battery electrodes, such as the density, capacity, service life, etc. of lithium batteries. In the manufacturing process of lithium battery electrodes, processes such as mixing, coating, rolling, slitting, and tabs are included. Among them, the purpose of rolling is to make the combination of lithium battery active substances and foil more dense and the thickness more uniform.

[0003] In the related art, during the rolling process of lithium battery electrodes, the method of using a prefabricated curvature roll is often adopted to meet the demand for compensating deflection deformation during the production process of the electrode; however, since the prefabricated curvature requires making a roll surface curvature corresponding to the electrode requirements on the roll surface in advance, the roll surface curvature is fixed and cannot be adjusted, resulting in the inability of the prefabricated curvature roll to meet the diverse production requirements of electrode performance. For different electrode production requirements, different prefabricated curvature rolls need to be configured, resulting in high production costs, and a large amount of time is required during the debugging process of the prefabricated curvature roll, affecting the production efficiency of electrode rolling. Summary of the Invention

[0004] To solve or partially solve the problems existing in the related art, the present application provides a method and device for controlling the thermal crown of a roll surface, an electronic device, and a readable storage medium, which can realize dynamic regulation of the thermal crown of the roll surface, effectively overcome the problem of poor adaptability caused by the fixed roll surface curvature of traditional prefabricated curvature rolls, enable the roll to flexibly match different electrode production requirements, thereby effectively reducing production costs and effectively improving the production efficiency of electrode rolling.

[0005] The first aspect of the present application provides a method for controlling the thermal crown of a roll surface, which is applied to a roll with an adjustable roll surface. The roll is relatively provided with a first flow channel area and a second flow channel area from outside to inside. The first flow channel area passes through a first fluid medium, and the second flow channel area passes through a second fluid medium. The method for controlling the thermal crown of the roll surface includes: Obtain target parameters and roll surface parameters, and determine the thermal crown regulation state of the roll; When the thermal crown regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameters; wherein, the medium parameters at least include: flow rate value and temperature value.

[0006] In some embodiments, the obtaining target parameters and roll surface parameters, and determining the thermal crown regulation state of the roll includes: Obtain multiple pole piece thickness values sampled along the same width direction of the pole pieces produced by the roll, calculate the required amount of roll surface convexity deformation based on the multiple pole piece thickness values, and obtain the target parameter; Obtain multiple roll surface deformation amounts sampled along the same length direction of the roll surface of the roll to obtain roll surface parameters; Determine the regulation error parameter according to the target parameter and the roll surface parameter; Determine the thermal convexity regulation state of the roll according to the regulation error parameter.

[0007] In some embodiments, the regulation error parameter includes: a first error and a second error; the first error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll, and the second error is the absolute difference between the maximum deformation amount of the roll surface convexity of the current roll and the target parameter; Determining the thermal convexity regulation state of the roll according to the regulation error parameter includes: When the first error is greater than a preset first threshold or the second error is greater than a preset second threshold, determine that the thermal convexity regulation state of the roll does not meet the conditions.

[0008] In some embodiments, when the thermal convexity regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameter, including: When the thermal convexity regulation state does not meet the conditions, regulate the flow values of the first fluid medium and the second fluid medium according to a first adaptive regulation strategy, and detect a third error; the third error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll; When the third error is less than a preset third threshold, regulate the temperature values of the first fluid medium and the second fluid medium according to a second adaptive regulation strategy.

[0009] In some embodiments, before determining the target parameter according to the pole piece thickness parameter of the pole pieces produced by the roll, the method further includes: Regulate the first fluid medium and the second fluid medium to operate for a preset time according to preset initial parameters, and detect the roll surface morphology of the roll; Determining the target parameter according to the thickness parameter of the pole pieces produced by the roll includes: When it is determined that the roll surface morphology is a parabolic shape, obtain the target parameter and the roll surface parameter, and determine the thermal convexity regulation state of the roll.

[0010] In some embodiments, the method further includes: When the hot crown control state meets the conditions, record the medium parameters of the current first fluid medium and the second fluid medium.

[0011] The second aspect of this application provides a roll surface hot crown control device, which is applied to a roll with an adjustable roll surface. The roll is relatively provided with a first flow channel area and a second flow channel area from the outside to the inside. The first flow channel area passes through a first fluid medium, and the second flow channel area passes through a second fluid medium. The roll surface hot crown control device includes: A data detection module, configured to obtain target parameters and roll surface parameters, and determine the hot crown control state of the roll. A strategy execution module, configured to, when the hot crown control state does not meet the conditions, adjust the medium parameters of the first fluid medium and the second fluid medium through a preset adjustment strategy and the target parameters; wherein, the medium parameters at least include: a flow value and a temperature value.

[0012] In some embodiments, the device further includes: A pre-operation module, configured to, before the data detection module determines the target parameters according to the thickness parameter of the pole piece produced by the roll, adjust the first fluid medium and the second fluid medium to run for a preset time according to preset initial parameters, and detect the roll surface morphology of the roll. The data detection module determines the target parameters according to the thickness parameter of the pole piece produced by the roll, including: when determining that the roll surface morphology is a parabolic shape, obtaining the target parameters and the roll surface parameters, and determining the hot crown control state of the roll.

[0013] The third aspect of this application provides an electronic device, including: A processor; and A memory, on which executable code is stored. When the executable code is executed by the processor, the processor is enabled to execute the method as described above.

[0014] The fourth aspect of this application provides a computer-readable storage medium, on which executable code is stored. When the executable code is executed by a processor of an electronic device, the processor is enabled to execute the method as described above.

[0015] The technical solution provided by this application may include the following beneficial effects: The technical solution of this application, through the internal and external double-channel partition control mechanism, based on real-time target parameters and roll surface parameters, accurately matches different pole piece deflection compensation requirements, and uses the coordinated control of the flow rate and temperature of the double-fluid medium to achieve dynamic control of the thermal crown of the roll surface. Furthermore, the curvature of the roll surface can be adjusted adaptively without stopping the machine for replacement or repeated debugging, effectively overcoming the poor adaptability problem caused by the fixed roll surface curvature of traditional prefabricated curvature rolls, enabling the roll to flexibly match different pole piece production requirements, thereby effectively reducing production costs, and avoiding production interruptions and debugging time-consuming problems caused by frequent roll replacement, effectively improving the production efficiency of pole piece rolling.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By describing the exemplary embodiments of this application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of this application will become more obvious. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0018] Figure 1 It is a schematic diagram of the flow channel area distribution of a roll with an adjustable roll surface shown in an embodiment of this application; Figure 2 It is a schematic flowchart of a method for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 3 It is another schematic flowchart of a method for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 4 It is another schematic flowchart of a method for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 5 It is a schematic diagram of the operation logic of the PID adjustment algorithm in the related art shown in an embodiment of this application; Figure 6 It is another schematic flowchart of a method for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 7 It is a schematic diagram of the structure of a device for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 8 It is another schematic diagram of the structure of a device for controlling the thermal crown of a roll surface shown in an embodiment of this application; Figure 9 It is a schematic diagram of the structure of an electronic device shown in an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application will be more thorough and complete, and can fully convey the scope of the present application to those skilled in the art.

[0020] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0022] In the related art, during the rolling process of lithium battery electrodes, the method of using a prefabricated arc roll is often adopted to meet the demand for compensating deflection deformation of the electrode during production; however, since the prefabricated arc requires making a roll surface arc corresponding to the electrode demand on the roll surface in advance, the roll surface arc is fixed and cannot be adjusted, resulting in the inability of the prefabricated arc roll to meet the diverse production demands of electrode performance. For different electrode production demands, different prefabricated arc rolls need to be configured, leading to high production costs, and a large amount of time is required during the debugging process of the prefabricated arc roll, affecting the production efficiency of electrode rolling.

[0023] In view of the above problems, the embodiments of the present application provide a method for controlling the thermal crown of the roll surface, which can realize the dynamic regulation of the thermal crown of the roll surface, effectively overcome the problem of poor adaptability caused by the fixed roll surface arc of the traditional prefabricated arc roll, enable the rolling mill to flexibly match different electrode production demands, thereby effectively reducing production costs and effectively improving the production efficiency of electrode rolling.

[0024] The technical solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the flow channel area distribution of a roll with an adjustable roll surface shown in the embodiments of the present application.

[0026] See Figure 1 , the roll surface thermal crown control method of the present application is mainly applied to rolls with adjustable roll surfaces. Among them, the roll is provided with a first flow channel area 10 and a second flow channel area 20 arranged relatively from outside to inside. The first flow channel area 10 passes through a first fluid medium, and the second flow channel area 20 passes through a second fluid medium. It should be understood that the first flow channel area 10 and the second flow channel area 20 are provided with non-connecting flow channels for the first fluid medium and the second fluid medium to circulate independently of each other.

[0027] Among them, the temperatures of the first fluid medium and the second fluid medium can be different. Specifically, the first fluid medium and the second fluid medium can be a heat medium and a refrigerant respectively. It can be understood that by regulating the heat exchange process of the heat medium and the refrigerant, the roll surface curvature or thermal crown of the roll can be adjusted accordingly.

[0028] Among them, as Figure 1 shown in Fig. 1(a), the first flow channel area 10 can be distributed in the outer layer area of the roll body, and the second flow channel area 20 can be located in the inner layer area. As Figure 1 shown in Fig. 1(b), further, there can be two second flow channel areas 20, and the two second flow channel areas 20 can be distributed at both ends of the roll body. The flow channels of the two second flow channel areas 20 are not connected to each other, that is, the second fluid media passing through the two second flow channel areas 20 circulate independently of each other. Of course, the first flow channel area 10 and the second flow channel area 20 can also be set in other distribution ways according to actual application requirements, which are not limited here.

[0029] Further, by setting different distributions of the flow channels in the first flow channel area 10 and the second flow channel area 20, such as different flow channel spacing distributions or different flow channel density distributions, and then using the heat exchange between the fluid media with different temperatures in the two flow channel areas, a temperature gradient in the transverse dimension can be formed along the axis direction of the roll surface. For example, the first flow channel area 10 forms a full-width flow channel distribution in the outer layer area of the roll body, and the second flow channel area 20 forms a flow channel distribution with higher sides and lower middle relative to the roll body axis in the inner layer area of the roll body. Another example is that the first flow channel area 10 forms a full-width flow channel distribution in the outer layer area of the roll body, and the second flow channel area 20 forms a flow channel distribution with denser sides and sparser middle relative to the roll body axis in the inner layer area of the roll body. In this way, through the above different distributions of the flow channels, relying on the material characteristics of thermal expansion and contraction of metals, a transverse temperature difference exists in the roll body, and then a different deformation of the roll body is formed, so as to realize a controllable deformed roll surface. It should be understood that when the temperatures on both sides are lower than the temperature in the middle, a convex crown-shaped roll surface can be formed on the roll body, thereby suppressing the deformation of the roll pressure disturbance.

[0030] Figure 2It is a schematic flow chart of the roll surface thermal crown control method shown in the embodiments of the present application.

[0031] See Figure 2 , the roll surface thermal crown control method of the present application includes: S110, obtain the target parameters and the roll surface parameters, and determine the thermal crown regulation state of the roll.

[0032] In this step, obtain the target parameters to be achieved for regulating the roll surface thermal crown and the current roll surface parameters of the roll, and use the target parameters and the roll surface parameters to determine the current thermal crown regulation state of the roll.

[0033] Among them, the thermal crown regulation state can include meeting the conditions and not meeting the conditions. When the thermal crown regulation state meets the conditions, it can indicate that the current roll surface parameters of the roll can produce the pole piece products that meet the requirements; when the thermal crown regulation state does not meet the conditions, it means that the current roll surface parameters of the roll cannot produce the pole piece products that meet the requirements, and the roll surface thermal crown needs to be regulated.

[0034] S120, when the thermal crown regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameters; among them, the medium parameters at least include: the flow value and the temperature value.

[0035] In this step, when it is determined that the thermal crown regulation state of the roll does not meet the conditions, according to the preset regulation strategy and the target parameters, regulate the medium parameters of the first fluid medium and the second fluid medium operating in the flow channel area. Among them, the medium parameters at least include: the flow value of the medium and the temperature value.

[0036] It should be understood that the flow velocity magnitude between the two fluid media inside the flow channel will affect the symmetry of the left and right deformation amounts of the roll surface expansion, while the temperature magnitude between the two fluid media will affect the maximum deformation amount of the roll surface bulge.

[0037] It should be noted that the roll surface thermal crown control method of the present application is applicable to the start-up stage or the production debugging stage of the pole piece rolling production. After the roll surface thermal crown of the roll is adaptively adjusted, the roll surface thermal crown of the roll meets the pole piece generation requirements.

[0038] In this embodiment, the method for controlling the thermal crown of the roll surface of the present application, through the internal and external double-channel partition control mechanism, based on the real-time target parameters and roll surface parameters, accurately matches different pole piece deflection compensation requirements, and uses the coordinated control of the flow rate and temperature of the two-fluid medium to realize the dynamic control of the thermal crown of the roll surface. Furthermore, the roll surface curvature can be adaptively adjusted without stopping the machine for replacement or repeated debugging, effectively overcoming the poor adaptability problem caused by the fixed roll surface curvature of the traditional prefabricated curvature roll, enabling the rolling mill to flexibly match different pole piece production requirements, thereby effectively reducing production costs, and avoiding production interruptions and debugging time-consuming problems caused by frequent roll replacement, effectively improving the production efficiency of pole piece rolling.

[0039] Figure 3 is another schematic flowchart of the method for controlling the thermal crown of the roll surface shown in the embodiment of the present application. On the basis of the embodiment shown in Figure 1 this embodiment further elaborates on the method for controlling the thermal crown of the roll surface of the present application.

[0040] See Figure 3 , the method for controlling the thermal crown of the roll surface of the present application includes: S210, according to the preset initial parameters, regulate the operation of the first fluid medium and the second fluid medium for a preset time, and detect the roll surface morphology of the rolling mill.

[0041] In this step, according to the preset initial parameters, control the operation of the first fluid medium and the second fluid medium for a preset time, and detect whether the roll surface morphology of the rolling mill is a parabolic shape. It can be understood that when the roll surface morphology of the rolling mill is a parabolic shape, it means that the roll surface of the rolling mill meets the initial state of thermal crown control.

[0042] Among them, the initial parameters can be the medium parameters corresponding to the first fluid medium and the second fluid medium in the historical production process. Among them, the initial parameters can at least include: the flow rate value and temperature value of the first fluid medium and the second fluid medium. For example, the medium parameters when the first fluid medium and the second fluid medium were stably operating in the previous production process, and the initial parameters in the current production process. In this way, the regulation time can be effectively reduced. Of course, the initial parameters can be preset and fixed, that is, the same initial parameters can be used to control the operation of the first fluid medium and the second fluid medium for a preset time in each production process.

[0043] Among them, the preset operation time can be set according to actual application requirements. For example, the preset operation time can be 30 seconds.

[0044] S220, when it is determined that the roll surface morphology is a parabolic shape, obtain the target parameters and roll surface parameters, and determine the thermal crown control state of the rolling mill.

[0045] In this step, when it is determined that the roll surface shape is a parabolic shape, it is judged that the operating states of the first fluid medium and the second fluid medium in the roll are stable, and the target parameters and roll surface parameters corresponding to the current production process are started to be obtained. The thermal crown control state of the roll is determined through the target parameters and the roll surface parameters.

[0046] Among them, the target parameters can be determined according to the thickness parameters of the electrode sheets produced by the roll; the roll surface parameters can be determined according to the deformation parameters of the roll surface.

[0047] In some embodiments, the regulation error parameter can be determined according to the target parameters and the roll surface parameters, and the thermal crown control state of the roll can be determined through the regulation error parameter. Among them, the regulation error parameter is the relevant error judgment parameter of the current roll when the current roll needs to meet the requirements corresponding to the target parameters.

[0048] S230, when the thermal crown control state does not meet the conditions, the medium parameters of the first fluid medium and the second fluid medium are regulated through a preset regulation strategy and the target parameters; among them, the medium parameters at least include: the flow value and the temperature value.

[0049] In this step, when it is determined that the thermal crown control state of the roll does not meet the conditions, the medium parameters of the first fluid medium and the second fluid medium operating in the flow channel area are regulated according to the preset regulation strategy and the target parameters. Among them, the medium parameters at least include: the flow value of the medium and the temperature value.

[0050] S240, when the thermal crown control state meets the conditions, record the medium parameters of the current first fluid medium and the second fluid medium.

[0051] In this step, when it is determined that the thermal crown control state of the roll meets the conditions, it is considered that the medium parameters of the first fluid medium and the second fluid medium operating in the flow channel area of the current roll meet the production requirements of the electrode sheets, and the current medium parameters are recorded as the final regulation parameters for the first fluid medium and the second fluid medium, and the stable operation of the first fluid medium and the second fluid medium is maintained.

[0052] Among them, in the roll surface thermal crown control method of the present application, when the thermal crown control state does not meet the conditions, the medium parameters of the first fluid medium and the second fluid medium can be regulated once and then return to step S220 to re-judge the thermal crown control state until the thermal crown control state meets the conditions, and the regulation process is stopped to realize the adaptive iterative regulation process of the medium parameters of the first fluid medium and the second fluid medium.

[0053] In this embodiment, the method for controlling the thermal crown of the roll surface of the present application controls the operation of the first fluid medium and the second fluid medium for a preset time according to initial parameters in advance. When it is determined that the roll surface shape is a parabolic shape, the first fluid medium and the second fluid medium of the roll are then regulated to ensure that the regulation is carried out under a stable operating state of the roll, effectively avoiding parameter jumps caused by regulation under unstable conditions, thereby effectively ensuring the stability and accuracy of the regulation process.

[0054] Figure 4 is another schematic flowchart of the method for controlling the thermal crown of the roll surface shown in the embodiments of the present application. Based on the embodiment shown in Figure 1 this embodiment further elaborates on the method for controlling the thermal crown of the roll surface of the present application.

[0055] See Figure 4 , the method for controlling the thermal crown of the roll surface of the present application includes: S310. Obtain multiple pole piece thickness values sampled along the same width direction of the pole piece produced by the roll, calculate the required deformation of the roll surface crown according to the multiple pole piece thickness values, and obtain the target parameter.

[0056] In this step, multiple pole piece thickness values are obtained by a thickness sensor along the same width direction of the pole piece, and the required deformation of the roll surface crown is calculated according to the consistency of the multiple pole piece thickness values adopted, and the calculated required deformation of the roll surface crown is used as the target parameter for regulating the roll.

[0057] Among them, the multiple pole piece thickness values sampled can correspond to at least the left end, middle, and right end regions of the pole piece. Through the multiple pole piece thickness values covering at least the left end, middle, and right end regions of the pole piece, the overall thickness consistency of the pole piece produced by the roll can be judged, and thus whether the overall thickness value of the pole piece meets the production requirements can be judged. For example, the multiple pole piece thickness values sampled can include multiple pole piece thickness values corresponding to the left end, middle, and right end regions of the pole piece respectively.

[0058] S320. Obtain multiple roll surface deformation amounts sampled along the same length direction of the roll surface of the roll, and obtain the roll surface parameter.

[0059] In this step, multiple roll surface deformation amounts are sampled along the same length direction of the roll surface of the roll by a displacement sensor, and the sampled multiple roll surface deformation amounts are used as the roll surface parameter.

[0060] It should be understood that the roll surface deformation amount can refer to the deformation amount of the current roll surface of the roll relative to the initial roll surface.

[0061] Among them, the multiple measured roll surface deformation amounts can at least correspond to the left end, middle, and right end regions of the roll surface. In this way, the multiple measured roll surface deformation amounts can cover the entire roll surface, thereby further improving the subsequent regulation accuracy.

[0062] S330. Determine a regulation error parameter according to the target parameter and the roll surface parameter; where the regulation error parameter includes a first error and a second error, the first error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll, and the second error is the absolute difference between the maximum deformation amount of the roll crown of the current roll and the target parameter.

[0063] In this step, according to the obtained target parameter and the roll surface parameter, calculate a regulation error parameter for judging the thermal crown regulation state of the roll.

[0064] Among them, the regulation error parameter is a relevant error judgment parameter of the current roll when the current roll needs to meet the requirements corresponding to the target parameter.

[0065] Through the first error representing the absolute difference between the deformation amounts at both ends of the roll surface of the current roll, it can be judged whether the roll surface of the current roll satisfies the parabolic shape distribution; through the second error representing the absolute difference between the maximum deformation amount of the roll crown of the current roll and the target parameter, it can be judged whether the thermal crown deformation amount of the roll surface of the current roll meets the deflection compensation requirements during the production of the pole piece.

[0066] S340. When the first error is greater than a preset first threshold or the second error is greater than a preset second threshold, determine that the thermal crown regulation state of the roll does not meet the conditions.

[0067] In this step, according to the first error and the second error in the determined regulation error parameter, when the first error is greater than the preset first threshold or the second error is greater than the preset second threshold, determine that the thermal crown regulation state of the roll does not meet the conditions, that is, judge that the thermal crown of the roll needs to be regulated.

[0068] It can be understood that when any one of the first error and the second error does not meet the conditions, it is judged that the thermal crown of the roll needs to be regulated. In this way, through the setting of the double judgment mechanism, the judgment accuracy of the thermal crown regulation state of the roll can be effectively improved.

[0069] Among them, the first threshold and the second threshold can be the same or different. Among them, both the first threshold and the second threshold are preset values approaching zero. For example, the first threshold and the second threshold can be ε1 and ε2 respectively, where both ε1 and ε2 approach zero.

[0070] That is to say, when the first error is less than the preset first threshold and the second error is less than the preset second threshold, it is considered that the thermal crown regulation state meets the conditions.

[0071] S350. When the thermal crown control state does not meet the conditions, adjust the flow rates of the first fluid medium and the second fluid medium according to the first adaptive adjustment strategy, and detect the third error; the third error is the absolute difference between the deformation amounts at both ends of the roll surface of the real-time roll.

[0072] In this step, when it is determined that the thermal crown control state does not meet the conditions, the medium parameters of the first fluid medium and the second fluid medium are adjusted to achieve adaptive control of the thermal crown of the roll. Among them, according to the preset first adaptive adjustment strategy, the flow rates of the first fluid medium and the second fluid medium are adjusted, and the third error, which is the absolute difference between the deformation amounts at both ends of the roll surface of the real-time roll, is detected.

[0073] It can be understood that the third error is used to determine whether the roll surface shape of the real-time roll meets the condition that the deformation amounts at both ends are the same, so as to meet the left-right symmetric structure of the parabolic shape of the roll surface.

[0074] Among them, the first self-adaptive adjustment strategy is used to adaptively adjust the flow rates of the first fluid medium and the second fluid medium so that the third error meets the preset conditions. For example, when the third error is less than the preset third threshold, it is considered that the adjustment process corresponding to the first adaptive adjustment strategy is completed.

[0075] Among them, the deformation amounts at both ends of the roll surface in the third error can also be both less than the roll surface deformation amount in the corresponding specific area of the roll surface. For example, the deformation amounts at both ends of the roll surface in the third error can also be both less than the roll surface deformation amount in the middle area of the corresponding roll surface. In this way, the adjustment process corresponding to the first adaptive adjustment strategy can also ensure that the roll surface of the roll always maintains a parabolic shape distribution.

[0076] S360. When the third error is less than the preset third threshold, adjust the temperature values of the first fluid medium and the second fluid medium according to the second adaptive adjustment strategy.

[0077] In this step, when the third error is less than the preset third threshold, it is considered that the adaptive adjustment process of the flow rates of the first fluid medium and the second fluid medium is completed, and then the temperature values of the first fluid medium and the second fluid medium are adjusted according to the second adaptive adjustment strategy.

[0078] Among them, it can be judged whether the adjustment process corresponding to the second adaptive adjustment strategy is completed according to the detected fourth error. The fourth error can be the absolute difference between the maximum deformation amount of the roll crown of the real-time roll and the target parameter. Among them, through the fourth error, it can be judged whether the maximum deformation amount of the roll crown of the real-time roll in the adjustment process corresponding to the second adaptive adjustment strategy meets the deflection compensation requirement during the production of the pole piece. When the fourth error is less than the preset fourth threshold, it can be considered that the adjustment process corresponding to the second adaptive adjustment strategy is completed.

[0079] Among them, both the third threshold corresponding to the third error and the fourth threshold corresponding to the fourth error can be values approaching zero.

[0080] Figure 5 It is a schematic diagram of the operation logic of the PID adjustment algorithm in the related art shown in the embodiments of the present application.

[0081] Please also Figure 5 , both the first adaptive adjustment strategy and the second adaptive adjustment strategy in the present application can be implemented by using the PID adjustment algorithm in the related art. Among them, the PID adjustment algorithm is a deviation correction negative feedback control method based on errors, which adjusts the system error through three control methods of proportional, integral, and differential to achieve flexible and precise control. Specifically, the output formula of the PID adjustment algorithm can be as follows:

[0082] In the present application, the parameters related to the regulation of the first fluid medium and the second fluid medium are adaptively substituted into the above formula, and the adaptive adjustment process can be realized, which will not be elaborated here.

[0083] In the roll surface thermal crown control method of the present application, the steps S310 to S360 can be repeated iteratively to adjust the roll surface thermal crown of the roll to meet the production requirements for the thickness consistency of the produced pole pieces. Of course, an error range can also be preset in advance. When the thickness consistency of the pole pieces falls within the error range, it can be considered that the regulation of the roll surface thermal crown of the roll is in place.

[0084] In this embodiment, the roll surface thermal crown control method of the present application is provided with a first adaptive adjustment strategy and a second adaptive adjustment strategy. Through the staged adaptive adjustment strategy and combined with the real-time error detection mechanism, the flow rate and temperature of the first fluid medium and the second fluid medium are dynamically regulated, and then the synchronous control of the deformation on both sides of the roll and the precise adjustment of the roll surface crown compensation are realized. It can effectively avoid overshoot or lag in single-parameter adjustment, ensure the response efficiency of thermal crown regulation, and effectively improve the uniformity of the thickness of the produced pole pieces and the stability of the roll pressing forming process.

[0085] Figure 6 It is another flow schematic diagram of the roll surface thermal crown control method shown in the embodiments of the present application.

[0086] See Figure 6, for the convenience of understanding the technical solution of the present application, the following takes the collection of three deformation amounts S1, S2, and S3 corresponding to the left end, middle, and right end positions of the roll surface, and the collection of three pole piece thickness values D1, D2, and D3 corresponding to the left end, middle, and right end positions of the pole piece as examples to further elaborate on the roll surface thermal crown control method of the present application. The roll surface thermal crown control method of the present application includes: S410, set the initial temperature T1 and initial flow rate Q1 of the corresponding heat medium, and the initial temperature T2 and initial flow rate Q2 of the corresponding refrigerant.

[0087] It should be understood that the temperature of the heat medium is higher than that of the refrigerant.

[0088] S420, drive the heat medium and the refrigerant to enter the inside of the rolling mill through the hot and cold mold temperature controller, and after circulating for a preset time at the initial temperature value and the initial flow rate value, determine that a parabolic crown is generated on the roll surface.

[0089] S430, output the deformation amounts S1, S2, and S3 at the left, middle, and right positions of the roll surface through the displacement sensor, and output the pole piece thicknesses D1, D2, and D3 at the corresponding left, middle, and right positions of the roll surface on the pole piece through the thickness sensor, and calculate the pole piece control deflection value S according to D1, D2, and D3 0， S ∈ [0, 50um].

[0090] S440, analyze and evaluate the deformation amount error on both sides of the roll surface. When |S1 - S3| ≤ ε and ε tends to zero, enter step S450; otherwise, proceed to step S460.

[0091] S450, analyze and evaluate the maximum deformation amount error of the roll surface crown. When |S2 - S0| ≤ ε and ε tends to zero, enter step S480; otherwise, enter the next step.

[0092] S460, perform the first PID feedback adjustment process to online correct the flow rate values Q of the heat medium and the refrigerant 1、 Q 2， Obtain the corrected Q1' 、 Q2', the corrected Q1' 、 Q2' satisfies |S1 - S3| ≤ ε and ε tends to zero, and both S1 and S3 are less than S2.

[0093] S470, enter the second PID feedback adjustment process to online correct the temperature values T1 and T2 of the heat medium and the refrigerant, obtain the corrected T1' and T2', and the corrected T1' and T2' satisfy |S2 - S0| ≤ ε and ε tends to zero.

[0094] S480, determine whether the pole piece thicknesses D1, D2, and D3 are consistent and within the error range. If so, proceed to the next step; otherwise, return to step S430.

[0095] Among them, when the absolute values between D1, D2, and D3 approach zero pairwise and are within the preset error range, it is considered to meet the requirements and proceed to the next step.

[0096] S490, output the flow values and temperature values of the heat medium and the refrigerant corresponding to the optimal crown control parameters.

[0097] Through the above steps S410 to S490, the thermal crown control of the roll surface is realized, meeting the requirement of compensating for the deflection of the pole piece during the pole piece rolling production process.

[0098] Corresponding to the foregoing method embodiments for realizing application functions, the present application further provides a roll surface thermal crown control device, an electronic device, and corresponding embodiments.

[0099] Figure 7 is a schematic structural diagram of the roll surface thermal crown control device shown in the embodiments of the present application.

[0100] See Figure 7 , the roll surface thermal crown control device of the present application is applied to a roll with an adjustable roll surface. The roll is relatively provided with a first flow channel area and a second flow channel area from outside to inside. The first flow channel area passes through a first fluid medium, and the second flow channel area passes through a second fluid medium. The roll surface thermal crown control device 500 includes: a data detection module 510 and a strategy execution module 520.

[0101] The data detection module 510 is used to obtain target parameters and roll surface parameters, and determine the thermal crown regulation state of the roll.

[0102] In some embodiments, the data detection module 510 can also obtain multiple pole piece thickness values sampled along the same width direction of the pole piece produced by the roll, calculate the required amount of roll surface convexity deformation based on the multiple pole piece thickness values to obtain target parameters; obtain multiple roll surface deformation amounts sampled along the same length direction of the roll surface of the roll to obtain roll surface parameters; determine the regulation error parameters based on the target parameters and the roll surface parameters; and determine the thermal crown regulation state of the roll based on the regulation error parameters.

[0103] In some embodiments, the regulation error parameters include: a first error and a second error; the first error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll, and the second error is the absolute difference between the maximum deformation amount of the roll surface convexity of the current roll and the target parameter; the data detection module 510 can also determine that the thermal crown regulation state of the roll does not meet the conditions when the first error is greater than a preset first threshold or the second error is greater than a preset second threshold.

[0104] The policy execution module 520 is configured to, when the hot crown regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation policy and target parameters; wherein, the medium parameters at least include: flow rate value and temperature value.

[0105] In some embodiments, the policy execution module 520 can also, when the hot crown regulation state does not meet the conditions, regulate the flow rate values of the first fluid medium and the second fluid medium according to the first adaptive regulation policy, and detect the third error; the third error is the absolute difference between the deformation amounts at both ends of the roll surface of the real-time roll; when the third error is less than a preset third threshold, regulate the temperature values of the first fluid medium and the second fluid medium according to the second adaptive regulation policy.

[0106] Figure 8 It is another structural schematic diagram of the roll surface hot crown control device shown in the embodiments of the present application.

[0107] Please refer to Figure 8 , in some embodiments, the roll surface hot crown control device 500 further includes: a pre-operation module 530.

[0108] The pre-operation module 530 is configured to, before the data detection module 510 determines the target parameters according to the pole piece thickness parameters of the roll production, regulate the first fluid medium and the second fluid medium to run for a preset time according to the preset initial parameters, and detect the roll surface morphology of the roll.

[0109] The data detection module 510 can also, when determining that the roll surface morphology is a parabolic shape, obtain the target parameters and roll surface parameters, and determine the hot crown regulation state of the roll.

[0110] In this embodiment, the roll surface hot crown control device of the present application, through the internal and external double-channel partition regulation mechanism, based on the real-time target parameters and roll surface parameters, accurately matches different pole piece deflection compensation requirements, and uses the coordinated control of the flow rate and temperature of the double fluid medium to realize the dynamic regulation of the roll surface hot crown. Furthermore, the roll surface radian can be adaptively adjusted, without the need to stop the machine for replacement or repeated debugging, effectively overcoming the poor adaptability problem caused by the fixed roll surface radian of the traditional prefabricated radian roll, enabling the roll to flexibly match different pole piece production requirements, thereby effectively reducing production costs, and avoiding production interruption and debugging time-consuming problems caused by frequent roll replacement, effectively improving the production efficiency of pole piece rolling.

[0111] Regarding the device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated here in detail.

[0112] Figure 9 It is a structural schematic diagram of the electronic device shown in the embodiments of the present application.

[0113] See Figure 9 , the electronic device 1000 includes a memory 1010 and a processor 1020.

[0114] The processor 1020 can be a central processing unit (CPU), or can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The memory 1010 can include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. Among them, the ROM can store static data or instructions required by the processor 1020 or other modules of the computer. The permanent storage device can be a readable and writable storage device. The permanent storage device can be a non-volatile storage device that does not lose the stored instructions and data even when the computer is powered off. In some embodiments, the permanent storage device uses a mass storage device (such as a magnetic or optical disk, flash memory) as the permanent storage device. In some other embodiments, the permanent storage device can be a removable storage device (such as a floppy disk, optical drive). The system memory can be a readable and writable storage device or a volatile readable and writable storage device, such as dynamic random access memory. The system memory can store some or all of the instructions and data required by the processor during operation. In addition, the memory 1010 can include any combination of computer-readable storage media, including various types of semiconductor storage chips (such as DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and magnetic disks and / or optical disks can also be used. In some embodiments, the memory 1010 can include a removable storage device that is readable and / or writable, such as a compact disc (CD), read-only digital versatile disc (such as DVD-ROM, dual-layer DVD-ROM), read-only Blu-ray disc, super density disc, flash memory card (such as SD card, min SD card, Micro-SD card, etc.), magnetic floppy disk, etc. The computer-readable storage medium does not include carrier waves and instantaneous electronic signals transmitted wirelessly or wired.

[0115] An executable code is stored on the memory 1010, and when the executable code is processed by the processor 1020, it can cause the processor 1020 to execute some or all of the methods described above.

[0116] In addition, the method according to the present application can also be implemented as a computer program or a computer program product, which includes computer program code instructions for executing some or all of the steps in the above-mentioned method of the present application.

[0117] Alternatively, the present application can also be implemented as a computer-readable storage medium (or a non-transitory machine-readable storage medium or a machine-readable storage medium), on which executable code (or a computer program or computer instruction code) is stored. When executed by a processor of an electronic device (or a server, etc.), it causes the processor to execute some or all of the steps of the above-mentioned method according to the present application.

[0118] The present application also provides a computer program product, the computer program product includes computer instructions, and when the computer instructions are executed by a processor, the above-mentioned method is implemented.

[0119] The above has described the embodiments of the present application. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the disclosed embodiments herein.

Claims

1. A method for controlling the thermal crown of a roll surface, characterized in that, Applied to a roll with adjustable roll surface, the roll is relatively provided with a first flow channel area and a second flow channel area from outside to inside. The first flow channel area passes through a first fluid medium, and the second flow channel area passes through a second fluid medium. The roll surface thermal crown control method includes: Obtain target parameters and roll surface parameters, and determine the thermal crown regulation state of the roll; When the thermal crown regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameters; wherein, the medium parameters at least include: flow rate value and temperature value.

2. The method according to claim 1, characterized in that, The obtaining of the target parameters and roll surface parameters and determining the thermal crown regulation state of the roll includes: Obtain multiple pole piece thickness values sampled along the same width direction of the pole piece produced by the roll, and calculate the required deformation of the roll surface crown according to the multiple pole piece thickness values to obtain the target parameters; Obtain multiple roll surface deformations sampled along the same length direction of the roll surface of the roll to obtain roll surface parameters; Determine the regulation error parameter according to the target parameter and the roll surface parameter; Determine the thermal crown regulation state of the roll according to the regulation error parameter.

3. The method according to claim 2, characterized in that The regulation error parameter includes: a first error and a second error; the first error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll, and the second error is the absolute difference between the maximum deformation amount of the roll surface crown of the current roll and the target parameter; Determining the thermal crown regulation state of the roll according to the regulation error parameter includes: When the first error is greater than a preset first threshold or the second error is greater than a preset second threshold, determine that the thermal crown regulation state of the roll does not meet the conditions.

4. The method according to claim 1, wherein The when the thermal crown regulation state does not meet the conditions, regulating the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameters includes: When the thermal crown regulation state does not meet the conditions, regulate the flow rate values of the first fluid medium and the second fluid medium according to a first adaptive regulation strategy, and detect a third error; the third error is the absolute difference between the deformation amounts at both ends of the roll surface of the current roll; When the third error is less than a preset third threshold, regulate the temperature values of the first fluid medium and the second fluid medium according to a second adaptive regulation strategy.

5. The method according to claim 1, characterized in that, Before determining the target parameter according to the thickness parameter of the pole piece produced by the roll, the method further includes: Regulate the first fluid medium and the second fluid medium to operate for a preset time according to preset initial parameters, and detect the roll surface shape of the roll; The determining of the target parameter according to the thickness parameter of the pole piece produced by the roll includes: When determining that the roll surface shape is a parabolic shape, obtain the target parameter and the roll surface parameter, and determine the thermal crown regulation state of the roll.

6. The method according to claim 1, wherein The method further includes: When the thermal crown regulation state meets the conditions, record the medium parameters of the current first fluid medium and the second fluid medium.

7. A roll surface thermal crown control device, characterized in that Applied to a roll with adjustable roll surface, the roll is relatively provided with a first flow channel area and a second flow channel area from outside to inside. The first flow channel area passes through a first fluid medium, and the second flow channel area passes through a second fluid medium. The roll surface thermal crown control device includes: A data detection module, configured to obtain target parameters and roll surface parameters, and determine the thermal crown regulation state of the roll; A strategy execution module, configured to, when the thermal crown regulation state does not meet the conditions, regulate the medium parameters of the first fluid medium and the second fluid medium through a preset regulation strategy and the target parameters; wherein, the medium parameters at least include: flow rate value and temperature value.

8. The device according to claim 7, characterized in that, The device further includes: A pre-operation module, configured to, before the data detection module determines the target parameters according to the pole piece thickness parameters produced by the roll, regulate the first fluid medium and the second fluid medium to operate for a preset time according to preset initial parameters, and detect the roll surface morphology of the roll; The data detection module determines the target parameters according to the thickness parameters of the pole piece produced by the roll, including: when determining that the roll surface morphology is a parabolic shape, obtaining the target parameters and the roll surface parameters, and determining the thermal crown regulation state of the roll.

9. An electronic device, characterized in that, Includes: A processor; And A memory, on which executable code is stored. When the executable code is executed by the processor, the processor is caused to execute the method according to any one of claims 1-6.

10. A computer-readable storage medium, on which executable code is stored. When the executable code is executed by a processor of an electronic device, the processor is caused to execute the method according to any one of claims 1-6.

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