Pole piece extending method, pole piece extending system, control device

Abstract

The application provides an electrode sheet stretching method, an electrode sheet stretching system and a control device. A specific embodiment of the method includes: obtaining an image of a to-be-tested electrode sheet segment; extracting a defect feature parameter of a blank area in the to-be-tested electrode sheet segment in the image; the defect feature parameter includes a type parameter, a size parameter and a position parameter corresponding to the defect; the blank area is an empty foil area and / or a transition area in the to-be-tested electrode sheet segment; determining a strip break risk index of the electrode sheet in the blank area according to the defect feature parameter; determining a stretching strategy according to the strip break risk index; and stretching the blank area according to the stretching strategy to reduce the possibility of strip break. The method can improve the strip break condition of the electrode sheet during the stretching process.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to an electrode stretching method, an electrode stretching system, and a control device. Background Technology

[0002] In the battery manufacturing process, to improve battery energy density, rolling can be performed on the electrodes after the coating process. During the rolling process, the coated area with active material on the electrode will lengthen along the belt direction under pressure, while the blank areas without active material (including empty foil areas and / or transition areas) will not lengthen because they are not subjected to pressure. Due to the difference in length, the blank areas will form wavy edges and / or wrinkles.

[0003] In related technologies, in order to improve the impact of wavy edges and / or wrinkles on subsequent processes (such as die-cutting, winding, etc.), the blank area can be extended separately. However, if there are defects in the blank area during the extension process, tape breakage can easily occur. Summary of the Invention

[0004] The purpose of this application is to provide an electrode stretching method, an electrode stretching system, and a control device to improve the breakage of the electrode during the stretching process.

[0005] In a first aspect, embodiments of this application provide an electrode stretching method, comprising: acquiring an image of an electrode segment to be tested; extracting defect feature parameters of a blank area in the electrode segment to be tested from the image; the blank area being an empty foil area and / or a transition area in the electrode segment to be tested; determining a breakage risk index of the electrode in the blank area based on the defect feature parameters; determining a stretching strategy based on the breakage risk index; and stretching the blank area according to the stretching strategy to reduce the possibility of breakage. Here, for defects in the blank area, the control device can determine an appropriate stretching strategy in conjunction with the defect feature parameters. In this way, the stretching strategy comprehensively considers the different characteristics of the defects, and therefore the determined stretching strategy is more suitable for the stretching processing of the current blank area. Thus, after controlling the relevant mechanisms in the calender to stretch the electrode based on the stretching strategy, the possibility of breakage can be reduced, thereby improving the breakage situation caused by the defect.

[0006] In addition, the defect feature parameters include the defect's type, size, and location parameters. This allows for a more comprehensive description of the defect.

[0007] Furthermore, determining the breakage risk index of the electrode in the blank area based on the defect feature parameters includes: determining a breakage risk score and / or breakage probability based on the defect feature parameters; and determining an extension strategy based on the breakage risk index includes: determining an extension strategy based on the breakage risk score and / or the breakage probability; determining the extension strategy includes: determining the extension speed and / or extension tension. In this way, the extension strategy can be determined from different dimensions using the breakage risk score and / or breakage probability, which to some extent improves the adaptability between the extension strategy and the defect.

[0008] Optionally, determining the breakage risk score based on the defect feature parameters includes: obtaining the weight corresponding to the type parameter in the defect feature parameters; the weight representing the risk of breakage caused by the corresponding type of defect; and determining the breakage risk score of the electrode in the blank area based on the weight corresponding to the type parameter and the size parameter in the defect feature parameters. In this way, for different types of defects, the breakage risk score in the blank area can be obtained by combining the weight corresponding to its type parameter. This classification and scoring of defects in the blank area can improve the accuracy of the breakage risk index, thereby allowing for the determination of an extension strategy more suitable for the defects to a certain extent.

[0009] Optionally, before obtaining the weights corresponding to the type parameters in the defect feature parameters, determining the breakage risk score based on the defect feature parameters further includes: obtaining multiple historical defect feature parameters and result labels corresponding to the multiple historical defect feature parameters; the result labels include a breakage occurrence label and a breakage non-occurrence label; the historical defect feature parameters include historical type parameters corresponding to the defects; using the multiple historical defect feature parameters and the result labels as input to the weight prediction model, and using the weights corresponding to the multiple historical type parameters as the expected output of the weight prediction model to train the weight prediction model; if the retraining condition is met, then retraining the weight prediction model based on the updated historical defect feature parameters; and obtaining the weights corresponding to the type parameters in the defect feature parameters includes: inputting the defect feature parameters into the weight prediction model to obtain the weights corresponding to the type parameters in the defect feature parameters. This allows for dynamic updating of the weights corresponding to the type parameters, which to some extent improves the accuracy of the weights corresponding to the type parameters of defects within the current blank area, thereby improving the adaptability of the extension strategy to the current defects.

[0010] Optionally, determining the breakage probability based on the defect feature parameters includes: inputting the defect feature parameters into a breakage prediction model to obtain the breakage probability of the electrode in the blank area. This allows for a more accurate and faster method to obtain the breakage probability through the breakage prediction model.

[0011] Optionally, determining the extension strategy based on the band breakage risk score and / or the band breakage probability includes: determining the score level corresponding to the band breakage risk score according to the score level classification rules; determining the probability level corresponding to the band breakage probability according to the probability level classification rules; and determining the extension strategy for the blank area based on the score level and the probability level. In this way, by classifying the band breakage risk score and the band breakage probability into levels according to the classification rules, both are unified into the same dimension, facilitating unified processing of both subsequently and improving the adaptability between the extension strategy and the defect.

[0012] Optionally, determining the extension strategy based on the rating level and the probability level includes: if the rating level is higher than the probability level, then determining the extension strategy as a rating level extension strategy; if the rating level is not higher than the probability level, then determining the extension strategy as a probability level extension strategy. This follows the principle that higher-level extension strategies cover lower-level extension strategies, thereby reducing the likelihood of band breakage.

[0013] Optionally, if the rating level is higher than the probability level, the extension strategy is determined to be a rating level extension strategy, including: determining the corresponding extension speed and / or extension tension when the rating level does not meet the first high-risk requirement; and determining the corresponding extension speed, extension tension, and / or repair information for defects in the blank area when the rating level meets the first high-risk requirement; wherein the extension speed when the first high-risk requirement is met is less than the extension speed when the first high-risk requirement is not met; and the extension tension when the first high-risk requirement is met is less than the extension tension when the first high-risk requirement is not met. In this way, by determining an extension strategy that reduces the extension speed and extension tension, the possibility of tape breakage can be reduced.

[0014] Optionally, if the rating level is not higher than the probability level, the extension strategy is determined to be a probability level extension strategy, including: determining the corresponding extension speed and / or extension tension when the probability level does not meet the second high-risk requirement; and determining the corresponding extension speed, extension tension, and / or repair information for defects in the blank area when the probability level meets the second high-risk requirement; wherein the extension speed when the second high-risk requirement is met is less than the extension speed when the second high-risk requirement is not met; and the extension tension when the second high-risk requirement is met is less than the extension tension when the second high-risk requirement is not met. In this way, the possibility of tape breakage can be reduced by determining an extension strategy that lowers the extension speed and extension tension.

[0015] Optionally, after determining the extension strategy based on the rating level and the probability level, the method further includes: during the execution of the extension strategy in the blank area, determining the risk level of the electrode in the subsequent blank area based on the defect characteristic parameters of the subsequent blank area in the electrode; the risk level is a rating level or a probability level; if the defect in the subsequent blank area is located in the execution area corresponding to the blank area, then if the risk level of the subsequent blank area is greater than the risk level of the blank area, the extension strategy corresponding to the subsequent blank area is executed. In this way, if there is a conflict between extension strategies, the extension strategy corresponding to the higher risk level can be executed first, thereby reducing the possibility of tape breakage.

[0016] Optionally, if the defect in the subsequent blank area is located in the execution area corresponding to the blank area, and the risk level of the subsequent blank area is greater than the risk level of the blank area, before executing the extension strategy corresponding to the subsequent blank area, the method further includes: determining the execution area based on the current extension speed and the time required to change from the current extension speed to the target speed; the target speed is determined based on the speed parameter in the extension strategy. This allows for a more accurate determination of the aforementioned execution area.

[0017] Secondly, embodiments of this application provide an electrode stretching system, including a camera group, a calender, and a control device; the calender includes an unwinding mechanism, a rolling mechanism, a pinch roll, and a winding mechanism arranged sequentially along the electrode conveying direction; the unwinding mechanism is used to feed the electrode; the rolling mechanism is used to roll the electrode; the electrode includes a blank area and a non-blank area; the blank area is an empty foil area and / or a transition area in the electrode segment to be tested; the pinch roll is used to stretch the blank area; the winding mechanism is used to wind the stretched electrode; the camera group is disposed between the unwinding mechanism and the rolling mechanism, and is used to acquire images of the electrode segment to be tested; the control device is used to execute the method described in the first aspect to obtain an stretching strategy for the blank area; the camera group executes the image acquisition command sent by the control device; the calender executes the stretching strategy sent by the control device.

[0018] In this way, the control device can instruct the camera group to acquire images of the electrode segment under test. Then, by extracting the defect feature parameters in the blank areas of the images, a breakage risk index is determined based on the defect feature parameters. Finally, a corresponding stretching strategy is adaptively determined based on the breakage risk index. Therefore, for defects in the blank areas, the control device can control the relevant mechanisms in the calender to stretch the electrode sheet with an appropriate stretching strategy, thereby improving the breakage situation caused by the defect.

[0019] Optionally, a repair mechanism is also included, located between the camera assembly and the rolling mechanism, for repairing defects in the blank area according to the stretching strategy. This allows the repair mechanism to fix defects in the blank area, reinforcing the electrode before it reaches the rolling mechanism, thus mitigating the risk of electrode breakage during stretching.

[0020] Optionally, the repair mechanism includes a foil-applying mechanism or an adhesive-applying mechanism; the foil-applying mechanism is used to apply foil to the defects in the blank area according to the stretching strategy; the adhesive-applying mechanism is used to apply adhesive to the defects in the blank area according to the stretching strategy. In this way, either the foil-applying mechanism or the adhesive-applying mechanism can be adaptively selected for repair based on the defect condition, facilitating adaptive treatment of different defects and improving the versatility of the repair mechanism to a certain extent.

[0021] Optionally, the camera group includes at least two cameras, wherein at least one camera is used to acquire an image of the front side of the electrode fragment to be tested, and at least one camera is used to acquire an image of the back side of the electrode fragment to be tested. In this way, by setting cameras on the front and back sides of the electrode to acquire images of the corresponding side, double-sided inspection of the electrode can be achieved, thereby enabling more comprehensive detection of defects in the electrode.

[0022] Optionally, the system also includes at least two sets of light sources, each set positioned on one side of each of the at least two cameras; each set of light sources provides illumination to the camera on its corresponding side. This allows the light sources to illuminate the electrode surface, creating a more pronounced contrast between imperfections and normal areas, making them easier for the camera to capture and identify. Furthermore, sufficient light also helps improve image clarity and reduces blurring and noise caused by insufficient light.

[0023] Thirdly, embodiments of this application provide a control device including a processor and a memory, the memory storing computer-readable instructions, which, when executed by the processor, perform the steps of the method provided in the first aspect above.

[0024] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the method provided in the first aspect above.

[0025] Fifthly, embodiments of this application provide a computer program product including a computer program or instructions that, when executed by a processor, perform the method described in the first aspect.

[0026] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural schematic diagram of a cold press provided in the prior art;

[0029] Figure 2 A schematic diagram of the incoming material of an electrode sheet provided for an embodiment of this application;

[0030] Figure 3 A schematic diagram of a blank area with wavy edges and / or wrinkles provided for an embodiment of this application;

[0031] Figure 4 An electrode stretching system provided in this application embodiment;

[0032] Figure 5 A schematic diagram illustrating the acquisition of images using an electrode stretching system, as provided in this application embodiment;

[0033] Figure 6 This is a schematic diagram illustrating a second method of acquiring images using an electrode stretching system, as provided in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram illustrating the third method of image acquisition using an electrode stretching system, as provided in the embodiments of this application.

[0035] Figure 8 This is a schematic diagram illustrating the fourth method of image acquisition using an electrode stretching system, as provided in the embodiments of this application.

[0036] Figure 9 This is a schematic diagram illustrating the fifth method of image acquisition using an electrode stretching system, as provided in the embodiments of this application.

[0037] Figure 10 A schematic diagram illustrating the repair of defects in an empty foil area, provided as an embodiment of this application;

[0038] Figure 11This is a schematic diagram illustrating another method for repairing defects in an empty foil area, provided as an embodiment of this application.

[0039] Figure 12 A schematic diagram of the communication structure between a control device and the outside world, provided for an embodiment of this application;

[0040] Figure 13 A flowchart illustrating an electrode stretching method provided in this application embodiment;

[0041] Figure 14 A schematic diagram of a control device for performing an electrode stretching method is provided in an embodiment of this application;

[0042] 1-Cold pressing unwinding roll, 2-Inlet traction roll, 3-Inlet traction tension isolation roll, 4-Rolling mechanism, 5-Outlet traction tension roll, 6-Pinch roll, 7-Outlet traction tension isolation roll, 8-Rewinding tension roll, 9-Outlet traction swing roll, 10-Rewinding roll, 11-Electrode sheet, 12-Coated film area, 13-Blank area, 131-Transition area, 132-Empty foil area, 14-Camera, 15-Light source, 16-Repair mechanism, 17-Defect, 1401-Processor, 1402-Communication interface, 1403-Memory, 1404-Communication bus. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0044] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] It should be noted that, unless otherwise specified, the embodiments or technical features in the embodiments of this application may be combined.

[0046] In related technologies, during battery production, to improve battery energy density, rolling can be performed on the electrodes after the coating process. During rolling, the coated area of ​​the electrode with active material will lengthen along the belt direction under pressure, while the blank areas without active material (including empty foil areas and / or transition areas) will not lengthen because they are not subjected to pressure. Due to the difference in length, the blank areas will form wavy edges and / or wrinkles.

[0047] To mitigate the impact of wavy edges and / or wrinkles on subsequent processes, the blank area can be extended separately. However, during this extension process, defects within the blank area can easily lead to tape breakage. Furthermore, tape breakage on the electrode sheet necessitates downtime to address the issue. Frequent tape breakages require frequent shutdowns. Additionally, tape breakage results in numerous joints, and the broken electrode sheets must be scrapped. Consequently, electrode production efficiency and costs are negatively impacted.

[0048] It should be noted that in related technologies, the electrode sheets are typically rolled using a calender, which can be either a cold calender or a hot calender, the difference being the rolling temperature. Subsequently, the electrode sheets can be cold-pressed or hot-pressed by adjusting the rolling temperature.

[0049] For example, please refer to Figure 1 It shows a structural schematic diagram of a cold press provided in the prior art. For example... Figure 1 As shown, the cold press may include a cold pressing unwinding roller 1, an inlet traction roller 2, an inlet traction tension isolation roller 3, a rolling mechanism 4, an outlet traction tension roller 5, a pinch roller 6, an outlet traction tension isolation roller 7, a winding tension roller 8, an outlet traction roller 9, and a winding roller 10. The electrode sheet 11 is fed into the cold pressing unwinding roller 1, passes sequentially through the inlet traction roller 2 and the inlet traction tension isolation roller 3, and is then fed into the rolling mechanism 4 to cold press the coating film area 12, thereby compacting the relatively thick active material coating film area and increasing the compaction density of the active material. Then, it passes through the outlet traction tension roller 5, and the pinch roller 6 extends the blank area 13 of the electrode sheet 11 individually, making its length as consistent as possible with the length of the cold-pressed coating film area 12. Finally, the electrode sheet 11 passes sequentially through the outlet traction tension isolation roller 7, the winding tension roller 8, and the outlet traction roller 9, and is wound up by the winding roller 10, thus completing the cold pressing process of the electrode sheet 11.

[0050] Please continue reading. Figure 2 It shows a schematic diagram of the incoming material of an electrode 11 provided in an embodiment of this application, such as... Figure 2As shown, the coated film area 12 (generally double-sided) of the electrode 11 is coated with active particulate material, the transition area 131 (generally double-sided) is coated with insulating ceramic material, and the empty foil area 132 is uncoated. It can be seen that the thickness of the coated film area 12 is relatively thick compared to the thickness of the transition area 131 and the empty foil area 132.

[0051] Due to the thickness difference between the blank area 13 and the coating film area 12, the blank area 13 is suspended during the cold pressing process, and therefore is not subjected to the force of the rolling mechanism 4. Consequently, the length of the blank area 13 does not extend along the belt travel direction after passing through the rolling mechanism 4. This results in the length of the coating film area 12 being greater than the length of the blank area 13. Due to this length difference, the blank area 13 forms a shape similar to... Figure 3 The wavy edges and / or wrinkles shown.

[0052] To mitigate the impact of wavy edges and / or wrinkles on subsequent processes, relatively large protrusions can be incorporated into the pinch roller 6, and the extension diameter of the roller in the pinch roller 6 can be increased. This allows the blank area 13 to extend along the belt conveyor direction during the extension process after being extended separately, reducing the length difference between the blank area 13 and the coating film area 12, improving the overall flatness of the electrode sheet 11, and minimizing wavy edges and wrinkles.

[0053] However, during the extension process of the pinch roller 6 on the blank area 13, if there are defects in the blank area 13, these defects can easily lead to stress concentration in the area, a decrease in the local tensile strength of the electrode 11, or a decrease in the local elongation of the electrode 11, thus easily causing the electrode 11 to break. If the electrode 11 breaks, the machine will need to be stopped to handle the breakage event. If the breakage event occurs frequently, frequent shutdowns will be required. In addition, breakage will result in more joints, and the broken electrode 11 will also need to be scrapped. Therefore, it will affect the production efficiency and cost of the electrode.

[0054] To address the aforementioned problems, this application provides an electrode stretching method, an electrode stretching system, and a control device. Furthermore, this application extracts defect characteristic parameters from the blank areas of the electrode segment under test, then determines a breakage risk index based on these parameters, and finally adaptively determines a corresponding stretching strategy based on the breakage risk index. By controlling the relevant mechanisms to perform stretching processing according to this strategy, the breakage situation can be improved. This alleviates the frequent downtime and electrode scrapping caused by breakage.

[0055] It should be noted that the defects in the solutions in the above-mentioned related technologies were discovered by the inventors after long-term practice and careful research. Therefore, the discovery process of the above-mentioned problems and the solutions proposed by the embodiments of the present invention in the following text should be considered as contributions made by the inventors to the present invention.

[0056] Please see Figure 4 This document illustrates an electrode stretching system provided in an embodiment of this application. The system includes a camera assembly, a calender, and a control device. The control device executes a stretching strategy for the blank area 13. Specifically, the control device acquires an image of the electrode segment to be tested. Then, it extracts defect feature parameters of the blank area 13 in the image. The blank area 13 is the empty foil area 132 and / or transition area 131 in the electrode segment to be tested. Then, based on the defect feature parameters, it determines the breakage risk index of the electrode 11 in the blank area 13. Finally, based on the breakage risk index, it determines a stretching strategy for the blank area 13. The stretching strategy may include, for example, stretching at a determined stretching speed and stretching tension. The specific process by which the control device obtains the stretching strategy for the blank area 13 is described in detail later and will not be repeated here.

[0057] Furthermore, the camera group executes the image acquisition command sent by the control device; the calender executes the stretching strategy sent by the control device;

[0058] The calender includes an unwinding mechanism, a roll mechanism 4, a pinch roll 6, and a winding mechanism arranged sequentially along the conveying direction of the electrode sheet 11.

[0059] The unwinding mechanism is used to feed the electrode sheet 11; the unwinding mechanism may be, for example, the aforementioned cold-pressed unwinding roller 1.

[0060] The rolling mechanism 4 is used to roll and press the electrode sheet 11.

[0061] It should be understood that in some embodiments of this application, the blank area 13 refers to the empty foil area 132 in the electrode segment to be tested; in other embodiments, the blank area 13 refers to the transition area 131 in the electrode segment to be tested; and in still other embodiments, the blank area 13 refers to the area of ​​the transition area 131 and the empty foil area 132 combined.

[0062] The pinch roller 6 is used to extend the blank area 13.

[0063] The winding mechanism is used to wind the extended electrode sheet 11; it may be, for example, the winding roller 10 as described above.

[0064] It is understood that the calender in this implementation can be a cold press as described in the related technologies mentioned above, and the specific structure of its various mechanisms and the process of achieving the corresponding functions can be the same as or similar to the corresponding mechanisms in the related technologies, which will not be elaborated here. In addition, the calender can also be a hot press, which differs from the cold press in that the rolling temperature is different, and the specific structure of the relevant mechanisms and the process of achieving the corresponding functions can be similar to the corresponding mechanisms of the cold press in the related technologies, which will not be elaborated here either.

[0065] Furthermore, the various mechanisms within the calender can communicate with a control device, enabling them to perform related operations based on the stretching strategy sent by the control device. For example, the unwinding mechanism can unwind based on the unwinding command in the stretching strategy sent by the control device. This unwinding command may include information such as unwinding speed and unwinding time.

[0066] The camera group is positioned between the unwinding mechanism and the rolling mechanism 4, and is used to acquire images of the pole segment to be tested. It is understood that the camera group can receive image acquisition commands sent by the control device, and then acquire pole segments within the current imaging range based on these commands; these pole segments are the aforementioned pole segments to be tested. The image acquisition commands may include information such as the number of images to be acquired and the acquisition time. This allows the control device to determine the aforementioned extension strategy based on the images.

[0067] In this implementation, the control device instructs the camera group to acquire images of the electrode segment to be tested. Then, by extracting defect feature parameters from the blank area 13 in the image, a breakage risk index is determined based on these defect feature parameters. Finally, a corresponding stretching strategy is adaptively determined based on the breakage risk index. Therefore, for defects in the blank area 13, the control device can control the relevant mechanisms in the calender to stretch the electrode 11 using an appropriate stretching strategy, thereby improving the breakage situation caused by the defect.

[0068] For example, if the band breakage risk index indicates a low risk of band breakage, the current stretching speed and stretching tension can be maintained unchanged; if the index indicates a high risk, the stretching speed and stretching tension can be reduced; if the index indicates an even higher risk, the stretching speed and stretching tension can be further reduced. This reduces the likelihood of band breakage and improves the situation.

[0069] In some applications, such as the cold pressing process of lithium battery electrodes, a CCD (Charge-Coupled Device) camera is usually set on one side of the electrode 11. This only allows for the identification of defects on the side where the CCD camera is set, and cannot identify defects on the other side of the electrode 11, thus failing to detect defects comprehensively.

[0070] To address the aforementioned issues, in some optional implementations of this application, the camera group is defined to include at least two cameras 14, wherein at least one camera 14 is used to acquire an image of the front side of the polar segment to be tested, and at least one camera 14 is used to acquire an image of the back side of the polar segment to be tested.

[0071] In this way, by setting cameras 14 on the front and back of the electrode 11 to capture images of the corresponding side, double-sided inspection of the electrode 11 can be achieved, thereby enabling more comprehensive detection of defects in the electrode 11.

[0072] Understandably, multiple cameras 14 can be set on each side of the segment to be tested to perform more comprehensive defect detection. Alternatively, camera groups can be set only on the front or back sides, which can also achieve comprehensive defect detection on the side where the camera group is set.

[0073] Furthermore, in some applications, CCD cameras 14 are typically mounted on both sides of the electrode 11 along its width. This results in each CCD camera 14 requiring a large acquisition width to fully capture the image of the electrode 11, often necessitating the use of telephoto lenses to capture images of the electrode 11 at a relatively distant location. Consequently, only larger defects in the electrode 11 can be identified, while smaller defects cannot be accurately detected.

[0074] Therefore, in some alternative implementations of this application, a short-focal-length high-speed three-line scanning camera 14 can be used to accurately identify minor defects that affect the tape breakage (such as defects in the tab area).

[0075] It should be noted that in other alternative implementations, camera 14 may also be a single-line scan camera, a dual-line scan camera, or a multi-line scan camera. These line scan cameras may include, for example, a 2-megapixel CCD camera at 500fps (that is, capable of capturing images with a resolution of 2 megapixels at 500 frames per second), an industrial camera, etc.

[0076] Alternatively, images can be acquired using 3D scanning devices, laser scanning devices, etc. Those skilled in the art can select appropriate devices based on the actual situation.

[0077] In some alternative implementations, the above-mentioned electrode stretching system further includes at least two sets of light sources 15, which are respectively disposed on one side of each of the at least two cameras 14; wherein each set of light sources 15 is used to provide illumination for the camera 14 on the corresponding side.

[0078] In some applications, the light source 15 can be, for example, a strip, a ring, or other shaped light strip. Furthermore, the number of light sources 15 in each group can be one or more; there is no limitation here.

[0079] In this implementation, the light source 15 illuminates the surface of the electrode 11, creating a more pronounced contrast between the imperfections and normal areas on the electrode 11, making it easier for the camera 14 to capture and identify them. Furthermore, sufficient light also helps improve image clarity and reduces problems such as blurring and noise caused by insufficient light.

[0080] Please see Figure 5 This illustration shows a schematic diagram of image acquisition using an electrode stretching system according to an embodiment of this application. It is understood that... Figure 5 The diagram shown only illustrates the acquisition of an image from one side of electrode 11. For the acquisition of an image from the other side of electrode 11, please refer to [the diagram]. Figure 5 Simply configure the relevant components.

[0081] like Figure 5 As shown, six cameras 14 are arranged on one side of the electrode 11. Three cameras 14 capture images of the blank area 13 in the same region on one side of the electrode 11, and the other three cameras 14 capture images of the blank area 13 in the same region on the other side of the electrode 11. A ring light source 15 is arranged in the middle area of ​​the three cameras 14 capturing the same region.

[0082] Please see Figure 6 This illustrates a schematic diagram of another image acquisition method using an electrode stretching system provided in an embodiment of this application. For example... Figure 6 As shown, two cameras 14 and two ring light sources 15 are set on one side of the electrode 11 to acquire images of the blank area 13 on one side of the current electrode segment.

[0083] Please see Figure 7 This illustrates a schematic diagram of another image acquisition method using an electrode stretching system provided in an embodiment of this application. For example... Figure 7 As shown, four cameras 14 are set on one side of the electrode 11, and a strip light source 15 is set around each camera 14.

[0084] Please see Figure 8 This illustrates a schematic diagram of another image acquisition method using an electrode stretching system provided in an embodiment of this application. For example... Figure 8 As shown, four cameras 14 are arranged on one side of the electrode 11. Two cameras 14 are used to capture images of the same blank area 13 on one side of the electrode 11, and the other two cameras 14 are used to capture images of the same blank area 13 on the other side of the electrode 11. For the two cameras 14 on the same side, one ring light source 15 and two strip light sources 15 are used to provide illumination.

[0085] It is understood that this application is not limited to the above. Figures 5-8 The combination of camera 14 and light source 15 shown can be adapted by those skilled in the art to change the shape of light source 15, the number of light sources 15, the type of camera 14, the number of cameras 14, etc., according to actual conditions.

[0086] Furthermore, images of different regions can be acquired through different combinations of camera 14 and light source 15. For example, images of a single empty foil region 132 or a single transition region 131 can be acquired. Alternatively, images of the entire polar segment can be acquired, or images of any two of the empty foil region 132, transition region 131, and coated film region 12 can be acquired, etc. This application does not limit this.

[0087] Please continue reading. Figure 9 This illustrates a schematic diagram of another image acquisition method using an electrode stretching system provided in an embodiment of this application. For example... Figure 9 As shown, for an electrode 11 with multiple blank areas 13 and multiple coated film areas 12 in the same conveying direction, one camera 14 and one ring light source 15 can be set up to collect images of the same blank area 13.

[0088] In some application scenarios, if the band breakage risk index indicates a high risk of band breakage, the extension strategy, in addition to limiting the extension speed and extension tension, can also limit repair information to repair the pole pieces. This repair information may include, for example, the location and size of the pole piece area to be repaired. Furthermore, the repair information may be applied to the entire blank area 13 or only to a preset fixed location; there are no restrictions here.

[0089] Therefore, in some alternative implementations, the electrode stretching system may also include a repair mechanism 16 located between the camera group and the roll mechanism 4, for repairing defects in the blank area 13 according to the stretching strategy.

[0090] In some applications, the repair mechanism 16 can be a single-axis robot, a dual-axis robot, or a three-axis robot. Additionally, the repair materials used by the repair mechanism 16 can include, for example, aluminum foil, copper foil, composite PET film, ceramic release film, and self-adhesive labels.

[0091] Please continue reading. Figure 10 This illustration shows a schematic diagram of repairing a defect 17 in an empty foil area 132 according to an embodiment of this application. Figure 10 As shown, there is one defect 17 in the empty foil area 132 (see details). Figure 10(a) The repair mechanism 16 can repair only the area occupied by the defect 17 (see section a for details). Figure 10 (b) can also be repaired by comparing the area occupied by defect 17 with a larger area (see details). Figure 10 (c in the text)

[0092] Please continue reading. Figure 11 This illustration shows a schematic diagram of repairing a defect 17 in an empty foil area 132 according to an embodiment of this application. Figure 11 As shown, there are 3 defects 17 in the empty foil area 132 (see details). Figure 11 In section A), each defect 17 has a different shape and size. In this case, the repair mechanism 16 can repair only the area occupied by the three defects 17 (see details...). Figure 11 (B in the text), or the entire empty foil area 132 can be modified (see details). Figure 11 (C in the text). It is understood that the repair mechanism 16 can repair the three defects 17 separately or all at once.

[0093] In this implementation, the defect 17 in the blank area 13 can be repaired by the repair mechanism 16. In this way, the electrode 11 is reinforced before it reaches the rolling mechanism 4, thus improving the situation where the electrode 11 breaks during the stretching process.

[0094] In some alternative implementations, the repair mechanism 16 includes a foil-applying mechanism or an adhesive-applying mechanism; the foil-applying mechanism is used to apply foil to the defects 17 in the blank area 13 according to the extension strategy; the adhesive-applying mechanism is used to apply adhesive to the defects 17 in the blank area 13 according to the extension strategy.

[0095] Understandably, if the repair mechanism 16 is a foil-applying mechanism, the repair materials used can be, for example, aluminum foil, copper foil, etc. If the repair mechanism 16 is an adhesive-applying mechanism, the repair materials used can be, for example, self-adhesive labels, tape, etc.

[0096] In this implementation, either a foil-applying mechanism or an adhesive-applying mechanism can be selected for repair based on the condition of the defect 17, so as to adapt to different defects 17 and improve the versatility of the repair mechanism 16 to a certain extent.

[0097] It should be noted that if the repair location is not located in the functional area of ​​electrode 11 (such as the coating area of ​​the positive and negative electrodes, the welding area on the current collector, etc.), it can be cut off during the die-cutting process in the subsequent process. If it is located in the functional area, it can be wound separately in the subsequent process to prevent defective products that have been repaired from flowing out.

[0098] Next, this application will describe in detail the process by which the control device obtains the extended strategy. It should be noted that the aforementioned control device may include, for example, an industrial control computer, which may integrate an FPGA (Field-Programmable Gate Array) to implement relevant logic processing.

[0099] For further information, please refer to [link / reference]. Figure 12 This illustration shows a schematic diagram of the communication structure between a control device and the outside world, as provided in an embodiment of this application. Figure 12 As shown, the control device includes an industrial computer, which can be connected to a data acquisition unit via a serial port. This data acquisition unit is connected to the camera group. After capturing an image, the camera group can transmit the image to the industrial computer via the data acquisition unit. Additionally, the industrial computer can communicate with a tension monitor, speed monitor, and encoder via a serial port to detect and control information such as stretching speed, stretching tension, and relevant positions (e.g., repair positions). Furthermore, the industrial computer can communicate with a multi-channel controller via a serial port. This multi-channel controller can, for example, control various mechanisms in the camera group, light source 15, and calender through different control units. For example, it can control the repair mechanism 16 to perform repairs, control the rolling mechanism 4 to perform rolling, and control the speed of the tension roll 5.

[0100] In some application scenarios, industrial control computers can also communicate with servers via a data serial port, enabling the industrial control computer to interact with the server, such as sending defect-related data to the server for storage and analysis, thereby optimizing the extension strategy determined by the industrial control computer.

[0101] Please continue reading. Figure 13 The diagram illustrates a flowchart of an electrode stretching method provided in an embodiment of this application. Figure 13 As shown, the electrode stretching method includes steps 1301 to 1305.

[0102] Step 1301: Obtain the image of the pole segment to be tested;

[0103] In some applications, images of the electrode segment to be tested can be acquired in real time to facilitate continuous testing of the electrode; in other applications, images of the electrode segment to be tested can be acquired periodically, and there is no limitation here.

[0104] Understandably, the industrial control computer can acquire images of the electrode segment under test only after confirming that the calender is operating normally and stably. For example, after the calender is started, the industrial control computer can control the encoder to count the tape length and tape speed of the electrode. When it is determined that the tape length is equal to a preset length and the tape speed matches (e.g., is equal to) the preset tape speed for a duration greater than a preset duration, it can be determined that the calender is operating stably. The preset length can be, for example, 100 meters, 120 meters, etc.; the preset tape speed can be, for example, 10 meters / minute, 12 meters / minute, etc.; and the preset duration can be, for example, 1 minute, 2 minutes, etc.

[0105] Furthermore, after confirming that the calender is operating stably, the industrial control computer can send start commands to the light source group and camera group to control the light source group and camera group to work together.

[0106] Furthermore, the industrial control computer can send acquisition commands to the acquisition unit to obtain images of the pole segment to be measured from the camera group in the acquisition unit.

[0107] Understandably, if the industrial control computer determines that the calender is not operating stably, it can issue an alarm or shut down the machine.

[0108] Step 1302: Extract the defect feature parameters of the blank area in the polar segment to be tested from the image;

[0109] In some applications, if a CCD camera is used, the defect feature parameters corresponding to the defects in the measured polar segment can be extracted using this camera.

[0110] In other application scenarios, if a 3D scanning device is used, the three-dimensional point cloud data of the electrode can be obtained through 3D scanning. Then, the edge features of the electrode surface can be extracted using an edge detection algorithm, and parameters such as the length, width, and curvature of the edge can be calculated. At the same time, the surface unevenness in the three-dimensional model can be analyzed, and geometric parameters such as the depth and area of ​​the depressions or protrusions can be calculated to determine whether there are scratches, pinholes, or other defects, and to obtain the defect feature parameters corresponding to these defects.

[0111] Furthermore, you can extract the defect feature parameters corresponding to only one defect, or you can extract the defect feature parameters corresponding to multiple defects respectively, or you can extract the defect feature parameters corresponding to all detected defects respectively; there are no restrictions here.

[0112] In some optional implementations, the defect feature parameters include a type parameter, a size parameter, and a location parameter corresponding to the defect. The type parameter may include, for example, parameters such as pinholes, scratches, abrasions, and bumps. The size parameter may include, for example, the area of ​​a pinhole, the area of ​​a scratch, the length of a scratch, and the depth of a bump. The location parameter refers to the position of the defect. It may be, for example, coordinate data with a preset position as the origin.

[0113] It is understood that the aforementioned type parameter, size parameter, and position parameter can coexist, and there is a corresponding relationship between them. For example, the type parameter is the pinhole, the size parameter is the pinhole area, and the position parameter is the coordinates of the pinhole's location. Alternatively, each of the three can exist independently, or only two of them may exist. This application does not impose any restrictions on this.

[0114] Step 1303: Determine the risk index of electrode breakage in the blank area based on the defect feature parameters;

[0115] In some application scenarios, for example, the specific content of the defect feature parameters can be determined first, and then the breakage risk index corresponding to the defect feature parameter can be determined according to preset rules. Here, the preset rules can, for example, set multiple preset areas for pinholes, with different preset areas corresponding to different breakage risk indices. In this way, if the defect feature parameter represents the defect type as a pinhole, and the pinhole area matches a certain preset area (is the same or within a small error range), the breakage risk index corresponding to that preset area can be determined as the breakage risk index of the electrode in that blank area.

[0116] Step 1304: Determine the extension strategy based on the aforementioned band breakage risk index.

[0117] Similarly, preset rules can be set to determine the extension strategy. These preset rules could be, for example, pre-defined relationships between different band breakage risk indicators and their corresponding extension strategies. After determining the band breakage risk indicators for the blank area, the corresponding extension strategy can be determined based on these relationships.

[0118] Step 1305: Extend the blank area according to the extension strategy to reduce the possibility of tape breakage.

[0119] In this implementation, for defects in the blank area, the control device can determine an appropriate extension strategy based on the defect characteristic parameters. In this way, the extension strategy takes into account the different characteristics of the defects more comprehensively. Therefore, the determined extension strategy is more suitable for the extension processing of the current blank area. After the relevant mechanism in the calender is controlled to perform the extension processing of the electrode sheet based on the extension strategy, the possibility of strip breakage can be reduced, thereby improving the strip breakage situation caused by the defect.

[0120] Understandably, improving the strip breakage situation can reduce frequent shutdowns, electrode joint failures, and electrode scrapping, thus substantially improving electrode production capacity, production efficiency, and production costs.

[0121] In some alternative implementations, the step 1303 above, which describes determining the breakage risk index of the electrode in the blank area based on the defect feature parameters, includes: determining the breakage risk score and / or breakage probability based on the defect feature parameters; it is understood that the breakage risk score and breakage probability can both be used to characterize the possibility of breakage.

[0122] Understandably, referring to the above example, the correlation between various defect feature parameters and the breakage risk score and breakage probability can be preset, so that the corresponding breakage risk score and / or breakage probability can be determined based on the defect feature parameters.

[0123] Furthermore, any of the aforementioned relationships may be set through the experience of operators or obtained by analyzing historical data, and this application does not impose any restrictions on this.

[0124] Thus, the determination of the extension strategy based on the band breakage risk index in step 1304 above includes: determining the extension strategy based on the band breakage risk score and / or the band breakage probability; the determination of the extension strategy includes: determining the extension speed and / or the extension tension.

[0125] In other words, if only one of the risk score or the probability of tape breakage is determined, the corresponding extension strategy can be determined directly based on the determined one; if both are determined, the extension strategy can be determined by combining both.

[0126] In this implementation, the extension strategy can be determined from different dimensions by using the risk score of the band breakage and / or the probability of band breakage, which improves the adaptability between the extension strategy and the defect to a certain extent.

[0127] In some alternative implementations, when determining the breakage risk score, the weight corresponding to the type parameter in the defect feature parameters can be obtained; the weight represents the risk of the corresponding type of defect causing the breakage; then, based on the weight corresponding to the type parameter and the size parameter in the defect feature parameters, the breakage risk score of the electrode in the blank area is determined.

[0128] The above process can be represented, for example, by the following calculation formula: ;in, Characterizing defect risk score; Characteristic weights; Characteristic parameters that represent defects; Index representing defects.

[0129] For example, if three defects—pinhole, scratch, and bump—are detected in the blank area, the electrode's breakage risk score in that blank area is... It can be represented as: ;in, Weights that characterize the type of pinhole; Characterizes the area of ​​the pinhole; Weights corresponding to the types of scratches; Characterizes the length of the abrasion; Weights that characterize the type of concave / convex point; Characterizes the depth of the bumps and depressions. It is understandable that if other defects such as dry material residue or other types of defects exist, the risk score for tape breakage can be further determined by combining the dimensional parameters corresponding to these types of defects.

[0130] In this implementation, for different types of defects, the weights corresponding to their type parameters can be combined to obtain the breakage risk score of the blank area. This classification and scoring of defects in the blank area can improve the accuracy of the breakage risk index, thereby determining an extension strategy that is more suitable for the defects to a certain extent.

[0131] In some optional implementations, before obtaining the weights corresponding to the type parameters in the defect feature parameters, the step of determining the breakage risk score based on the defect feature parameters further includes:

[0132] Obtain multiple historical defect feature parameters and corresponding result labels for the multiple historical defect feature parameters; the result labels include labels indicating that tape breakage occurred and labels indicating that tape breakage did not occur; the historical defect feature parameters include historical type parameters corresponding to the defects;

[0133] Then, the multiple historical defect feature parameters and the result labels are used as inputs to the weight prediction model, and the weights corresponding to the multiple historical type parameters are used as the expected outputs of the weight prediction model to train the weight prediction model.

[0134] Then, if the retraining condition is met, the weight prediction model is retrained based on the updated historical defect feature parameters;

[0135] The aforementioned retraining conditions may include, for example, acquiring new defective feature parameters or reaching a preset retraining interval.

[0136] In this way, the weights can be dynamically changed based on different historical defect feature parameters, thus obtaining more appropriate weights.

[0137] Subsequently, obtaining the weight corresponding to the type parameter in the defect feature parameters includes: inputting the defect feature parameters into the weight prediction model to obtain the weight corresponding to the type parameter in the defect feature parameters.

[0138] In other words, by inputting the currently acquired defect feature parameters into the corresponding weight prediction model, the weights corresponding to the currently acquired type parameters can be obtained. It is understood that the aforementioned weight prediction model can include, for example, neural network models, support vector machines, regression models, etc.

[0139] In this implementation, the weights corresponding to the type parameters can be dynamically updated, which improves the accuracy of the weights corresponding to the type parameters of the defects in the current blank area to a certain extent, thereby helping to improve the adaptability of the extension strategy to the current defects.

[0140] In some alternative implementations, determining the breakage probability based on the defect feature parameters includes: inputting the defect feature parameters into a breakage prediction model to obtain the breakage probability of the electrode in the blank area.

[0141] In some applications, such as training a band breakage prediction model using historical feature parameters, a specific approach can be taken. For example, one can collect feature parameters corresponding to multiple (e.g., 10,000) historical defects and determine the corresponding label for each defect. Then, these feature parameters and their corresponding labels are used as input to the model, and the band breakage probability is used as the model's expected output to train the model, thus obtaining the band breakage prediction model.

[0142] Furthermore, the aforementioned band break prediction model may include, for example, a neural network model, a support vector machine, a regression model, etc.

[0143] In this way, after obtaining the defect feature parameters corresponding to the defects in the blank area, the probability of the blank area being broken can be obtained by using the broken band prediction model.

[0144] In this implementation, a more accurate probability of band breakage can be obtained through a band breakage prediction model, which is more convenient and faster.

[0145] In some alternative implementations, determining the extension strategy based on the band breakage risk score and / or the band breakage probability may include:

[0146] First, the rating level corresponding to the risk of belt breakage is determined according to the rating level classification rules;

[0147] For example, the above rating level division rules can be: When <30, it is classified as Level 1 Lx1; when 30≤ <70, classified as the second level Lx2; ≥70, classified as Level 3 Lx3. It is understandable that the grading rules for electrodes can differ for different types of batteries (e.g., lithium batteries, lithium iron phosphate batteries, etc.), and the specific grading thresholds can also vary. Characterize the risk score of band breakage.

[0148] Then, based on the probability level classification rules, the probability level corresponding to the probability of the band break is determined;

[0149] The above probability level classification rules can be, for example, as follows: When ≤0.6, it is classified as the first level Lp1; 0.6< ≤0.85, classified as the second level Lp2; >0.85, classified as the third level Lp3. Among them, Characterizes the probability of band breakage.

[0150] Finally, an extension strategy is determined based on the rating level and the probability level.

[0151] In some application scenarios, the extension strategy can be determined by combining both factors. For example, if both factors are greater than a first preset level, the extension strategy corresponding to the first preset level is determined as the extension strategy for the blank area. If both factors are less than a second preset level, the extension strategy corresponding to the second preset level is determined as the extension strategy for the blank area.

[0152] In this implementation, the risk score and probability of tape breakage are classified into levels according to the classification rules, thereby unifying the two into the same dimension, which facilitates the unified processing of the two in the future, thereby improving the adaptability between the extension strategy and the defect.

[0153] Understandably, the higher the rating, the greater the likelihood of a signal interruption. Therefore, in some optional implementations, if the rating level is higher than the probability level, the extension strategy is determined to be a rating level extension strategy; if the rating level is not higher than the probability level, the extension strategy is determined to be a probability level extension strategy.

[0154] In other words, between the risk level of band breakage and the probability level of band breakage, the extension strategy corresponding to the higher level is determined as the extension strategy for the blank area. This way, compared to the extension strategy corresponding to the lower level, the related processing in the higher-level extension strategy is more moderate, thereby reducing the possibility of band breakage. For example, compared to the extension strategy corresponding to the lower level, the extension speed and tension in the higher-level extension strategy are lower; therefore, extending the blank area based on the higher-level extension strategy can further reduce the probability of band breakage.

[0155] In this implementation, the principle of higher-level extension strategies covering lower-level extension strategies is followed, which reduces the likelihood of band breakage.

[0156] In some optional implementations, if the rating level does not meet the first high-risk requirement, a corresponding stretching speed and / or stretching tension can be determined; and if the rating level meets the first high-risk requirement, a corresponding stretching speed, stretching tension, and / or repair information for defects in the blank area can be determined; wherein the stretching speed when the first high-risk requirement is met is less than the stretching speed when the first high-risk requirement is not met; and the stretching tension when the first high-risk requirement is met is less than the stretching tension when the first high-risk requirement is not met.

[0157] It is understandable that the likelihood of a band break is low when the highest risk requirement is not met, and high when the highest risk requirement is met. The highest risk requirement may include, for example, a score level greater than a preset level representing high risk (e.g., Lx3 mentioned above).

[0158] In some application scenarios, if the rating level is Lx1, which does not meet the highest risk requirement and the possibility of tape breakage is low, then a preset standard speed (e.g., 120 meters per minute) and standard tension can be used for stretching. If the rating level is Lx2, which also does not meet the highest risk requirement, then a speed lower than the standard speed and a tension lower than the standard tension can be used for stretching. Here, for example, the corresponding stretching speed and stretching tension can be dynamically determined. ; Characterizing the extensional tension corresponding to the rating level; Characterizing standard tension; Characterized by the tension reduction coefficient (e.g., 0.01); Characterizes the risk score of band rupture; additionally... ; Characterizes the extension speed corresponding to the rating level; Characterizing standard speed; Characterizes the deceleration factor (e.g., 0.75).

[0159] Additionally, if the rating level is Lx3, which meets the highest risk requirement, then a lower stretching speed (e.g., 75 m / min) and lower stretching tension can be used for stretching compared to Lx2. Here, for example, a default speed, such as 75 m / min, can also be set to meet the highest risk requirement. This allows the speed to be set to the lowest default speed when the highest risk requirement is met.

[0160] Furthermore, when meeting the highest risk requirement, in addition to reducing the stretching speed and tension, repair can also be performed due to the high probability of strip breakage. Therefore, the stretching strategy can also include corresponding repair information.

[0161] In this implementation, appropriate stretching speed, stretching tension, and repair information can be determined based on the risk level corresponding to the rating. Higher rating levels correspond to lower stretching speeds and smaller stretching tensions. Therefore, this implementation reduces the likelihood of band breakage by determining a stretching strategy that lowers both the stretching speed and stretching tension.

[0162] In some optional implementations, if the probability level does not meet the second highest risk requirement, a corresponding stretching speed and / or stretching tension are determined; if the probability level meets the second highest risk requirement, a corresponding stretching speed, stretching tension, and / or repair information for defects in the blank area are determined; wherein the stretching speed when the second highest risk requirement is met is less than the stretching speed when the second highest risk requirement is not met; and the stretching tension when the second highest risk requirement is met is less than the stretching tension when the second highest risk requirement is not met.

[0163] It is understandable that the probability of a band break is low when the second highest risk requirement is not met, and high when the second highest risk requirement is met. The second highest risk requirement may include, for example, a probability level greater than a preset level that characterizes high risk (e.g., Lp3 mentioned above).

[0164] In some application scenarios, if the probability level is Lp1, which does not meet the second highest risk requirement, and the possibility of tape breakage is low, then a preset standard speed (e.g., 120 meters per minute) and standard tension can be used for stretching. Furthermore, a correction factor can be added to the standard speed. In this case, the stretching speed can also be determined based on the following formula: .in, Characterizes the probability of band breakage. Characterizes the correction coefficient. The meanings of other parameters are the same as above.

[0165] Additionally, if the probability level is Lp2, which does not meet the second-highest risk requirement, then an extension speed and tension lower than the standard speed and tension can be used for extension processing. Here, for example, the corresponding extension speed and tension can also be dynamically determined. ; This represents the first default speed, such as 55 meters per minute.

[0166] Furthermore, if the probability level is Lp3, which meets the second-highest risk requirement, then a lower stretching speed and lower stretching tension can be used for stretching compared to Lp2. Here, for example, the corresponding stretching speed and stretching tension can also be dynamically determined. ; This represents the second default speed, for example, 75 meters per minute.

[0167] Furthermore, when meeting the second highest risk requirement, in addition to reducing the stretching speed and stretching tension, repair can also be carried out due to the high probability of strip breakage. Therefore, the stretching strategy can also include corresponding repair information.

[0168] In this implementation, adaptive stretching speed, stretching tension, and repair information can be determined based on the risk level corresponding to the probability level. Higher probability levels correspond to lower stretching speeds and smaller stretching tensions. Therefore, this implementation can also reduce the likelihood of band breakage by determining stretching strategies that reduce both stretching speed and stretching tension.

[0169] In some application scenarios, conflicts may exist between extension strategies. Therefore, in some optional implementations, after determining the extension strategy based on the rating level and the probability level, the method further includes:

[0170] First, during the execution of the extension strategy for the blank area, the risk level of the electrode in the subsequent blank area is determined based on the defect characteristic parameters of the subsequent blank area in the electrode; the risk level is a rating level or a probability level.

[0171] Here, it is understandable that, since the calender is working continuously, the control device may also extract the defect feature parameters in the subsequent blank areas while executing the extension strategy corresponding to the current blank area, so as to determine the risk level corresponding to the subsequent blank area.

[0172] It is understandable that the rating or probability level corresponding to the blank area can be the same as or similar to the method used to determine the rating and probability level corresponding to the blank area in the previous text, which will not be elaborated here.

[0173] Then, if the defect in the subsequent blank area is located in the execution area corresponding to the blank area, the extension strategy corresponding to the subsequent blank area is executed if the risk level of the subsequent blank area is greater than the risk level of the blank area.

[0174] It should be noted that the calender is working continuously, so the electrode is constantly moving. The execution of the stretching strategy requires a certain amount of time, so the moving area during this period can be regarded as the execution area.

[0175] In this way, if a defect in a subsequent blank area is located within the execution area, the extension strategy corresponding to the higher risk level can be executed first. That is, if the risk level of a subsequent blank area is high, the extension strategy corresponding to that subsequent blank area can be executed first; if the risk level of the current blank area is high, the extension strategy corresponding to the current blank area will continue to be executed, while the extension strategies corresponding to subsequent blank areas will be placed in a buffer queue to gradually execute the extension strategies with the highest risk level in the buffer queue.

[0176] Here, if the defect in the subsequent blank area is not located in the execution area corresponding to the blank area, a new execution area corresponding to the subsequent blank area can be created.

[0177] In addition, if the control device is not currently executing an extension strategy, it can immediately execute the extension strategy corresponding to the subsequent blank area.

[0178] In this implementation, if there is a conflict between extension strategies, the extension strategy corresponding to the higher risk level can be executed first, thereby reducing the possibility of band breakage.

[0179] In some alternative implementations, the execution region can be determined based on the current extension speed and the time required to change from the current extension speed to the target speed; the target speed is determined based on the speed parameters in the extension strategy.

[0180] For example, the execution region mentioned above can be determined using the following formula: ;in, Characterizes the execution region; This represents the current expansion speed of the blank area; Characterizes the time required for the current expansion speed of the blank area to change to the target speed; The buffer coefficient is used to characterize the speed. For example, it can be set to 1.2. In this case, if the current extension speed is 120m / min, and it takes 5 seconds to reduce the speed to 60m / min, then the locked area can be calculated as 12m. In this implementation, the above execution area can be obtained relatively accurately.

[0181] It should be noted that after the calender reaches the target speed, if there is no conflict, it can extend at that target speed until it leaves the locked area.

[0182] In some application scenarios, the control device can perform the following fallback operation when multiple conflict events are detected consecutively:

[0183] (1) Limit the stretching speed to 50% of the standard speed;

[0184] (2) Increase the fluctuation tolerance of the stretching tension by a preset multiple (e.g., 1.2 times).

[0185] (3) After the conflict event ends, the original data (such as standard speed, standard tension, etc.) will be automatically restored.

[0186] This helps the calender operate in a relatively stable state.

[0187] Those skilled in the art will understand that, in the methods described in the specific embodiments, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0188] Please see Figure 14 , Figure 14 This is a schematic diagram of a control device for performing an electrode stretching method according to an embodiment of this application. The control device may include: at least one processor 1401, such as a CPU, at least one communication interface 1402, at least one memory 1403, and at least one communication bus 1404. The communication bus 1404 is used to establish direct communication between these components. In this embodiment, the communication interface 1402 is used for signaling or data communication with other node devices. The memory 1403 may be a high-speed RAM or non-volatile memory, such as at least one disk storage device. Optionally, the memory 1403 may also be at least one storage device located remotely from the aforementioned processor. The memory 1403 stores computer-readable instructions. When these computer-readable instructions are executed by the processor 1401, the control device can perform the methods provided in the above-described method embodiments.

[0189] Understandable. Figure 14 The structure shown is for illustrative purposes only; the control device may also include a... Figure 14 The more or fewer components shown, or having the same Figure 14 The different configurations shown. Figure 14 The components shown can be implemented using hardware, software, or a combination thereof.

[0190] This application provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it can perform the methods provided in the above-described method embodiments.

[0191] This application provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer can perform the methods provided in the above-described method embodiments.

[0192] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0193] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0194] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0195] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method of sheeting an electrode tab, the method comprising: The method comprises: acquiring an image of a to-be-tested pole piece segment; extracting a defect feature parameter of a blank area in the to-be-tested pole piece segment in the image; the blank area is a hollow foil area and / or a transition area in the to-be-tested pole piece segment; the defect feature parameter comprises a type parameter, a size parameter and a position parameter corresponding to the defect; determining a strip risk index of the pole piece in the blank area according to the defect feature parameter; determining a stretching strategy according to the strip risk index; stretching the blank area according to the stretching strategy to reduce the possibility of strip breakage; the determining of the strip risk index of the pole piece in the blank area according to the defect feature parameter comprises: determining a strip risk score and / or a strip probability according to the defect feature parameter; and the determining of the stretching strategy according to the strip risk index comprises: determining the stretching strategy according to the strip risk score and / or the strip probability; the determining of the stretching strategy comprises determining a stretching speed and / or a stretching tension; wherein the determining of the stretching strategy according to the strip risk score and / or the strip probability comprises: determining a score level corresponding to the strip risk score according to a score level division rule; determining a probability level corresponding to the strip probability according to a probability level division rule; determining the stretching strategy according to the score level and the probability level; wherein the determining of the stretching strategy according to the score level and the probability level comprises: if the score level is higher than the probability level, determining the stretching strategy as a score level stretching strategy; the if the score level is higher than the probability level, determining the stretching strategy as a score level stretching strategy comprises: determining a corresponding stretching speed and / or a stretching tension in a case where the score level does not satisfy a first high risk requirement; determining a corresponding stretching speed, a stretching tension and / or repair information for a defect in the blank area in a case where the score level satisfies the first high risk requirement; wherein the stretching speed in the case where the score level satisfies the first high risk requirement is smaller than the stretching speed in the case where the score level does not satisfy the first high risk requirement; the stretching tension in the case where the score level satisfies the first high risk requirement is smaller than the stretching tension in the case where the score level does not satisfy the first high risk requirement.

2. The method of claim 1, wherein, the determining of the strip risk score according to the defect feature parameter comprises: acquiring a weight corresponding to a type parameter in the defect feature parameter; the weight represents a risk of strip breakage caused by a defect of the corresponding type; determining a strip risk score of the pole piece in the blank area according to the weight corresponding to the type parameter and a size parameter in the defect feature parameter.

3. The method of claim 2, wherein, before the acquiring of the weight corresponding to the type parameter in the defect feature parameter, the determining of the strip risk score according to the defect feature parameter further comprises: acquiring a plurality of historical defect feature parameters and result labels corresponding to the plurality of historical defect feature parameters; the result labels comprise a strip breakage occurrence label and a strip breakage non-occurrence label; the historical defect feature parameters comprise historical type parameters corresponding to defects. The plurality of historical defect feature parameters and the result label are taken as inputs of a weight prediction model, and weights corresponding to the plurality of historical type parameters are taken as expected outputs of the weight prediction model, so as to train the weight prediction model; If the retraining condition is met, the weight prediction model is retrained based on the updated historical defect feature parameters; and The weight corresponding to the type parameter in the defect feature parameter is obtained, including: The defect feature parameter is input into the weight prediction model to obtain the weight corresponding to the type parameter in the defect feature parameter.

4. The method of claim 1, wherein, The belt breakage probability is determined according to the defect feature parameter, including: The defect feature parameter is input into the belt breakage prediction model to obtain the belt breakage probability of the pole piece in the blank area.

5. The method of claim 1, wherein, The extension strategy is determined according to the score level and the probability level, including: If the score level is not higher than the probability level, the extension strategy is determined as a probability level extension strategy.

6. The method of claim 5, wherein, If the score level is not higher than the probability level, the extension strategy is determined as a probability level extension strategy, including: In the case where the probability level does not meet the second high-risk requirement, the corresponding extension speed and / or extension tension are determined; In the case where the probability level meets the second high-risk requirement, the corresponding extension speed, extension tension and / or repair information for the defect in the blank area are determined; Wherein, the extension speed in the case where the probability level meets the second high-risk requirement is less than the extension speed in the case where the probability level does not meet the second high-risk requirement; the extension tension in the case where the probability level meets the second high-risk requirement is less than the extension tension in the case where the probability level does not meet the second high-risk requirement.

7. The method according to any of claims 5-6, characterized by, After the extension strategy is determined according to the score level and the probability level, the method further includes: In the execution process of the extension strategy of the blank area, the risk level of the pole piece in the subsequent blank area of the pole piece is determined according to the defect feature parameter of the subsequent blank area; the risk level is a score level or a probability level; If the defect of the subsequent blank area is located in the execution area corresponding to the blank area, the extension strategy corresponding to the subsequent blank area is executed in the case where the risk level of the subsequent blank area is greater than the risk level of the blank area.

8. The method of claim 7, wherein, Before the extension strategy corresponding to the subsequent blank area is executed if the defect of the subsequent blank area is located in the execution area corresponding to the blank area, the risk level of the subsequent blank area is greater than the risk level of the blank area, the method further includes: The execution area is determined according to the current extension speed and the time required to change from the current extension speed to a target speed; the target speed is determined according to the speed parameter in the extension strategy.

9. An electrode tab elongation system characterized by, The method comprises a camera group, a calender and a control device; the calender comprises a unwinding mechanism, a roller mechanism, a pinch roll and a winding mechanism arranged in sequence along the conveying direction of the pole piece; The unwinding mechanism is used for feeding the pole piece; The roller mechanism is used for rolling the pole piece; the pole piece comprises a blank area and a non-blank area; the blank area is an empty foil area and / or a transition area in the to-be-tested pole piece segment; The pinch roll is used for extending the blank area; The method comprises a camera group, a calender and a control device; the calender comprises a unwinding mechanism, a roller mechanism, a pinch roll and a winding mechanism arranged in sequence along the conveying direction of the pole piece; The winding mechanism is configured to wind the stretched pole piece; The camera group is arranged between the unwinding mechanism and the rolling mechanism, and is configured to collect images of the to-be-tested pole piece segment; The control device is configured to execute the method according to any one of claims 1-8 to obtain the stretching strategy for the blank area; the camera group executes the image collection instruction sent by the control device; and the calender executes the stretching strategy sent by the control device.

10. The system of claim 9, wherein, The repair mechanism is arranged between the camera group and the rolling mechanism, and is configured to repair defects of the blank area according to the stretching strategy.

11. The system of claim 10, wherein, The repair mechanism comprises a foil pasting mechanism or a glue pasting mechanism. The foil pasting mechanism is configured to paste foil on the defects of the blank area according to the stretching strategy. The glue pasting mechanism is configured to paste glue on the defects of the blank area according to the stretching strategy.

12. The system of claim 9, wherein, The camera group comprises at least two cameras, wherein at least one camera is configured to acquire images of the front surface of the to-be-tested pole piece segment, and at least one camera is configured to acquire images of the back surface of the to-be-tested pole piece segment.

13. The system of claim 12, wherein, The camera group comprises at least two cameras, wherein at least one camera is configured to acquire images of the front surface of the to-be-tested pole piece segment, and at least one camera is configured to acquire images of the back surface of the to-be-tested pole piece segment.

14. A control device characterized by comprising: At least two groups of light sources are arranged on the respective sides of the at least two cameras, respectively; and each group of light sources is configured to provide illumination for the corresponding camera.

15. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to execute the method according to any one of claims 1-8.

16. A computer program product comprising computer programs or instructions, characterized in that, The computer program or the instruction is executed by the processor to execute the method according to any one of claims 1-8.

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