Electrode sheet roll-pressing and cutting system and method

Abstract

Disclosed in the present application is an electrode sheet roll-pressing and cutting system and method. The system comprises: an encoder, detection mechanisms, a programmable logic controller and a marking mechanism. The detection mechanisms shoot images of an electrode sheet in the system on the basis of the frequency of a pulse signal output by the encoder. An upper computer determines a defect region of the electrode sheet on the basis of the N-th image of the electrode sheet shot by the detection mechanisms and, on the basis of the defect region, determines the number S of pulses that the programmable logic controller needs to await. When determining that the S pulses have been awaited, the programmable logic controller sends a marking instruction to the marking mechanism. The marking mechanism marks the defect region of the electrode sheet on the basis of the marking instruction. In addition, the upper computer is further used for identifying edges of a tab region image among the images shot by the detection mechanisms, and determining the size of a tab region on the basis of the edges. Thus, the present application can determine the defect region of the electrode sheet, accurately mark the defect region on the basis of the position of the defect region in the electrode sheet, and determine the size of the tab region of the electrode sheet.

Description

Pole piece roller pressing and slitting system and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410199207.X filed on February 22, 2024, entitled “Pole Sheet Rolling and Slitting System and Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of battery technology, and in particular relates to a pole piece rolling and slitting system and method. Background Art

[0004] Battery pole sheets are a crucial component of battery cells. They are typically manufactured by rolling sheet metal and then slitting it. To improve manufacturing efficiency, current technologies primarily utilize a rolling and slitting system for manufacturing battery pole sheets.

[0005] During the manufacturing process of battery pole pieces, in order to improve the quality of pole pieces produced in the rolling and slitting process and enhance the safety and capacity consistency of battery cells, it is necessary to accurately detect surface defects on the pole pieces after rolling and slitting. In view of this, it is now necessary to provide a solution that can perform surface defect detection on pole pieces after rolling and slitting.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a pole piece rolling and slitting system and method, which can detect defects on the pole piece surface and accurately mark the defective areas.

[0008] In a first aspect, the present application provides a pole piece rolling and slitting system, comprising:

[0009] An encoder is used to output pulse signals to the detection mechanism and the programmable logic controller respectively during the process of the pole piece in the system being transported along the first direction;

[0010] A detection mechanism for capturing an image of a pole piece in the system based on the frequency of the pulse signal;

[0011] The host computer is used to determine the defective area of ​​the electrode piece based on the Nth image of the electrode piece captured by the detection mechanism, where N is a natural number; the host computer is also used to determine the response distance of the marking mechanism based on the position of the defective area in the target electrode piece area, where the target electrode piece area is the electrode piece area captured by the Nth image; determine the number of pulses S that the programmable logic controller needs to wait based on the response distance and the accuracy of the encoder; and send the number of pulses S to the programmable logic controller, where S is a natural number;

[0012] The programmable logic controller is used for sending a marking instruction to the marking mechanism when it is determined that S pulses have been waited;

[0013] A marking mechanism, used for marking defective areas of the electrode based on a marking instruction;

[0014] The images captured by the detection mechanism include an image of the tab area corresponding to the tab area;

[0015] The host computer is also used to identify the edge of the tab area image and determine the size of the tab area based on the edge.

[0016] In this way, the defective area in the electrode can be determined and accurately marked based on its location in the electrode. In addition, the size information of the tab area in the electrode can also be obtained through the host computer.

[0017] As a possible implementation, the marking mechanism is located downstream of the detection mechanism, and the first distance between the detection mechanism and the marking mechanism is the sum of the size of M+1 images and the redundant distance. The size of a single image is the length of the pole piece area captured in the image in the first direction, where M is a natural number.

[0018] The host computer is used to determine a second distance between the defect area and a target edge of the target electrode area, where the target edge is the edge of the target electrode area in the electrode transmission direction; and the sum of the second distance and the redundant distance is determined as the response distance of the marking mechanism;

[0019] The host computer is also used to send a pulse number S to the programmable logic controller when it is determined that the detection mechanism has taken the N+Mth image of the electrode.

[0020] In this way, the marking mechanism can be precisely controlled to mark the defective position of the electrode.

[0021] As a possible implementation method, the pole piece rolling and slitting system further includes a slitting mechanism;

[0022] The slitting mechanism is used to slit the first pole piece of the input system into a plurality of second pole pieces, wherein the width of the first pole piece is greater than that of the second pole piece;

[0023] The detection mechanism includes a first detection mechanism provided upstream of the slitting mechanism and a plurality of second detection mechanisms provided downstream of the slitting mechanism, wherein the plurality of second detection mechanisms correspond one to one to the plurality of second electrode sheets;

[0024] A first detection mechanism is used to capture the first surface of the first pole piece based on the frequency of the pulse signal to obtain a first image;

[0025] a plurality of second detection mechanisms, configured to photograph the second surfaces of the plurality of second pole pieces based on the frequency of the pulse signal to obtain a plurality of second images;

[0026] The host computer is used to determine the size of the defect area and the tab area of ​​the first pole piece and / or the plurality of second pole pieces based on the first image and / or the plurality of second images.

[0027] In this way, by setting up the first detection mechanism and multiple second detection mechanisms, it is possible to detect defects on the first surface and the second surface of each pole piece in the pole piece rolling and slitting system and determine the size of the pole lug area of ​​each pole piece.

[0028] As a possible implementation method, the host computer is used to generate edge points at the edge; eliminate discrete edge points among the edge points to obtain target edge points; perform straight line fitting on the target edge points to obtain two edge lines in a second direction, where the second direction is perpendicular to the first direction; and determine the distance between the two edge lines as the size of the tab area.

[0029] In this way, the size of the tab region in the second direction can be obtained.

[0030] As a possible implementation method, the pole piece roller pressing and slitting system also includes a correction mechanism;

[0031] The host computer is further configured to determine a deviation correction value based on the sizes of the plurality of tab areas determined from the plurality of second images, and send the deviation correction value to the deviation correction mechanism;

[0032] The correction mechanism is used to correct the pole piece based on the correction value.

[0033] In this way, the deviation of the pole piece rolling and slitting system can be corrected, and the product quality of the pole piece rolling and slitting system can be improved.

[0034] As a possible implementation method, the host computer is used to determine the size difference of each pair of tab areas among multiple tab areas, where each pair of tab areas are two tab areas located on both sides of the same cutting position; and determine the correction value based on the size difference.

[0035] In this way, a correction value that can characterize the dimensional consistency of the tab area of ​​the second pole piece can be obtained.

[0036] As a possible implementation method, the host computer is used to extract a target image area corresponding to the target detection area of ​​the pole piece from the Nth image of the pole piece; binarize the target image area to obtain a binary image of the target detection area; filter out a target area whose area is greater than or equal to an area threshold and whose width is greater than or equal to a width threshold from the foreground image of the binary image; and determine the target area as a defective area of ​​the pole piece.

[0037] In this way, the defective areas in the target inspection area that have an impact on the performance of the electrode can be accurately detected.

[0038] As a possible implementation, the first detection mechanism further includes a first camera, a first light source, and a first detection roller;

[0039] The first camera is arranged toward the first detection roller;

[0040] a first detection roller, configured to support the first pole piece so that the first surface of the first pole piece faces the first camera;

[0041] a first light source, for illuminating the first surface;

[0042] The first camera is used to photograph the illuminated first surface based on the frequency of the pulse signal to obtain a first image.

[0043] In this way, by providing the first light source and the first detection roller, it is easier for the first detection mechanism to photograph the first surface of the first pole piece, and defects on the first surface of the first pole piece can be more prominent in the first image.

[0044] As a possible implementation, the second detection mechanism includes a second camera, a second light source, and a second detection roller;

[0045] The second camera is arranged toward the second detection roller;

[0046] a second detection roller, configured to support the second pole piece so that the second surface of the second pole piece faces the second camera;

[0047] a second light source, for illuminating the second surface;

[0048] The second camera is used to photograph the illuminated second surface based on the frequency of the pulse signal to obtain a second image.

[0049] In this way, by providing the second light source and the second detection roller, it is easier for the second detection mechanism to photograph the second surface of the second pole piece, and defects on the second surface of the second pole piece can be more prominent in the second image.

[0050] In a second aspect, the present application provides a pole piece rolling and slitting method, comprising:

[0051] Outputting pulse signals to the detection mechanism and the programmable logic controller respectively through the encoder during the process of the pole piece in the pole piece rolling and slitting system being transported along the first direction;

[0052] The detection mechanism captures an image of the pole piece based on the frequency of the pulse signal;

[0053] The host computer determines the defective area of ​​the electrode based on the Nth image of the electrode taken by the detection mechanism, where N is a natural number;

[0054] The host computer determines the response distance of the marking mechanism based on the position of the defect area in the target electrode area, and the target electrode area is the electrode area captured by the Nth image;

[0055] The host computer determines the number of pulses S that the programmable logic controller needs to wait for based on the response distance and the accuracy of the encoder, where S is a natural number;

[0056] Send the pulse number S to the programmable logic controller through the host computer;

[0057] After determining that S pulses have been waited for, the programmable logic controller sends a marking instruction to the marking mechanism;

[0058] Marking the defective area of ​​the electrode by the marking mechanism based on the marking instruction;

[0059] The image captured by the detection mechanism includes an image of the tab area corresponding to the tab area, and the pole piece roller pressing and slitting method further includes:

[0060] The edge of the tab area image is identified by the host computer, and the size of the tab area is determined based on the edge.

[0061] In this way, the defective area in the electrode can be determined and accurately marked based on its location in the electrode. In addition, the size information of the tab area in the electrode can also be obtained through the host computer.

[0062] As a possible implementation, the marking mechanism is located downstream of the detection mechanism, and the first distance between the detection mechanism and the marking mechanism is the sum of the size of M+1 images and the redundant distance. The size of a single image is the length of the pole piece area captured in the image in the first direction, where M is a natural number.

[0063] The host computer determines the response distance of the marking mechanism based on the position of the defect area in the target electrode area, including:

[0064] Determine, by the host computer, a second distance between the defect area and a target edge of the target pole piece area, where the target edge is an edge of the target pole piece area in the pole piece transmission direction;

[0065] Determining the sum of the second distance and the redundant distance as the response distance of the marking mechanism;

[0066] Sending pulse number S to the programmable logic controller through the host computer includes:

[0067] When the host computer determines that the detection mechanism has taken the N+Mth image of the electrode, the pulse number S is sent to the programmable logic controller.

[0068] In this way, the defect position of the electrode can be accurately marked.

[0069] As a possible implementation, the electrode pieces in the electrode piece rolling and slitting system include a first electrode piece input into the system and a plurality of second electrode pieces obtained by slitting the first electrode piece by a slitting mechanism, the detection mechanism includes a first detection mechanism and a plurality of second detection mechanisms, the plurality of second detection mechanisms correspond one-to-one to the plurality of second electrode pieces, and the detection mechanism captures an image of the electrode piece based on the frequency of the pulse signal, including:

[0070] photographing the first surface of the first pole piece based on the frequency of the pulse signal by a first detection mechanism to obtain a first image;

[0071] The second surfaces of the plurality of second pole pieces are photographed based on the frequency of the pulse signal by the plurality of second detection mechanisms to obtain a plurality of second images.

[0072] In this way, by providing a first detection mechanism and a plurality of second detection mechanisms, it is possible to detect defects on the first surface and the second surface of each pole piece in the pole piece rolling and slitting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0074] FIG1 is a schematic diagram of a pole piece rolling and slitting system according to an embodiment of the present application;

[0075] FIG2 is a schematic diagram of a marking logic modeling of a marking mechanism according to an embodiment of the present application;

[0076] FIG3 is a schematic diagram of the detection mechanism arrangement position according to an embodiment of the present application;

[0077] FIG4 is a schematic diagram showing the principle of determining the size information of the tab area according to an embodiment of the present application;

[0078] FIG5 is a schematic diagram of a pole piece rolling and slitting system according to an embodiment of the present application;

[0079] FIG6 is a schematic diagram of a first pole piece according to an embodiment of the present application;

[0080] FIG7 is a schematic diagram of a second pole piece according to an embodiment of the present application;

[0081] FIG8 is a schematic diagram of a process for determining a defective region of a pole piece according to an embodiment of the present application;

[0082] FIG9 is a schematic diagram of a detection mechanism according to an embodiment of the present application;

[0083] FIG10 is a schematic diagram of the installation position of a camera in a detection mechanism according to an embodiment of the present application;

[0084] FIG11 is a schematic diagram of a first detection mechanism according to an embodiment of the present application;

[0085] FIG12 is a schematic diagram of a second detection mechanism according to an embodiment of the present application;

[0086] FIG13 is a schematic diagram of an image of an anode electrode sheet according to an embodiment of the present application;

[0087] FIG14 is a schematic diagram of an image of a cathode electrode according to an embodiment of the present application;

[0088] FIG15 is a flow chart of a pole piece rolling and slitting method according to an embodiment of the present application.

[0089] In the accompanying drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0090] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0091] Referring to FIG1 , a schematic diagram of a pole piece roller-slitting system provided in an embodiment of the present application is shown. As shown in FIG1 , the system 10 may include: a detection mechanism 11, a host computer 12, an encoder 13, a programmable logic controller 14, and a marking mechanism 15. The host computer 12 is connected to the detection mechanism 11 and the programmable logic controller 14, respectively; the encoder 13 is connected to the detection mechanism 11 and the programmable logic controller 14, respectively; and the marking mechanism 15 is connected to the programmable logic controller 14.

[0092] In some embodiments of the present application, the system 10 may include one or more detection mechanisms 11, each of which is connected to a host computer 12. FIG1 takes the system 10 as an example in which three detection mechanisms 11 are included, and the three detection mechanisms 11 are connected to the host computer 12. It should be noted that the number of detection mechanisms 11 included in the system 10 can be set according to the number of pole pieces that need to be detected in the system 10. The three detection mechanisms 11 are only examples and do not constitute a specific limitation on the number of detection mechanisms 11 in the system 10.

[0093] The encoder 13 is configured to output pulse signals to the detection mechanism 11 and the programmable logic controller 14, respectively, during the process of the electrode piece being conveyed in the system 10 along a first direction, wherein the first direction is the direction in which the electrode piece is conveyed in the system 10. The frequency of the pulse signal output by the encoder 13 is determined based on the conveying speed of the electrode piece in the system 10.

[0094] In some embodiments of the present application, the system 10 also includes a conveying roller for conveying the electrode. The encoder 13 can be coaxially connected to the conveying roller and output a pulse signal as the conveying roller rotates. In this way, the encoder 13 can synchronously output a pulse signal during the process of the conveying roller conveying the electrode. In this way, the shooting frequency of the detection mechanism 11 when photographing the electrode based on the pulse signal is consistent with the conveying speed of the electrode, so that the detection mechanism 11 can capture a complete image of each electrode area in the electrode.

[0095] When the system 10 includes multiple detection mechanisms 11, the encoder 13 can synchronously output pulse signals to the multiple detection mechanisms 11 during the process of the system 10 conveying the electrode, so that the multiple detection mechanisms 11 can synchronously capture images.

[0096] The detection mechanism 11 is used to capture the image of the pole piece in the system 10 based on the frequency of the pulse signal.

[0097] The host computer 12 is used to determine the defective area of ​​the electrode based on the Nth image of the electrode taken by the detection mechanism 11, where N is a natural number.

[0098] In some embodiments of the present application, N may be a value greater than or equal to 1. The Nth image of the electrode may be used to indicate the latest image of the electrode received by the host computer 12 during the operation of the system 10. The value of N may change with the operation of the system 10. After obtaining the Nth image of the electrode, the host computer 12 may detect the Nth image based on a defect detection algorithm preset in the host computer 12 to determine a defective area in the electrode. The defective area in the electrode may be an area where defects exist on the surface of the electrode. The surface defects may include, but are not limited to, surface foil leakage, decarburization, white spots, bubbles, and the like.

[0099] The host computer 12 is also used to determine the response distance of the marking mechanism 15 based on the position of the defective area in the target pole piece area after determining the defective area of ​​the pole piece based on the Nth image, and the target pole piece area is the pole piece area captured by the Nth image; determine the number of pulses S that the programmable logic controller 14 needs to wait based on the response distance and the accuracy of the encoder 13; and send the number of pulses S to the programmable logic controller 14, where S is a natural number.

[0100] In this embodiment, the accuracy of the encoder 13 is used to indicate the distance the pole piece moves in the first direction corresponding to one pulse output by the encoder 13. Therefore, when determining the number of pulses S that the programmable logic controller 14 needs to wait for based on the response distance and the accuracy of the encoder 13, the ratio of the response distance to the encoder 13 can be used as the number of pulses S.

[0101] In some embodiments of the present application, the accuracy of the encoder 13 can be determined based on the circumference of the conveyor roller connected to the encoder 13 and the number of pulses output by the encoder 13 per rotation of the conveyor roller. The ratio of the circumference of the conveyor roller to the number of pulses output by the encoder 13 per rotation of the conveyor roller is used as the accuracy of the encoder 13. The diameter of the conveyor roller is a fixed size, so the circumference is also a fixed value. Once the encoder 13 is selected, the number of pulses output by the encoder 13 per rotation of the conveyor roller is also fixed. It can be seen that after the encoder 13 is determined, the accuracy of the encoder 13 is fixed and does not change with the rotation speed of the conveyor roller, that is, the conveying speed of the pole piece. Based on this, after the encoder 13 is determined, the accuracy of the encoder 13 can be stored in the host computer 12, so that the host computer 12 can directly obtain the accuracy of the encoder 13 when determining the number of pulses S. In this embodiment, the response distance of the marking mechanism 15 refers to the distance between the defect area and the marking mechanism 15 when the host computer 12 sends a pulse number S to the programmable logic controller 14. The response distance can be accurately determined based on the position of the defect area on the target electrode area.

[0102] The programmable logic controller 14 is configured to send a marking instruction to the marking mechanism 15 when it is determined that S pulses have been waited.

[0103] In this embodiment, the marking mechanism 15 is controlled by the programmable logic controller 14. After receiving the number of pulses S sent by the host computer 12, the programmable logic controller 14 can count the number of pulses received. When it is determined that S pulses have been received, it is determined that the defective area has reached the position of the marking mechanism 15, and thus outputs a marking instruction to the marking mechanism 15 to instruct the marking mechanism 15 to perform marking.

[0104] The marking mechanism 15 is used to mark the defective area of ​​the electrode based on the marking instruction.

[0105] In this embodiment, after receiving the marking instruction output by the programmable logic controller 14 , the marking mechanism 15 marks the electrode in response to the marking instruction.

[0106] The existing control method for the marking mechanism 15 is usually that the host computer 12 outputs a hardware frame signal to the marking mechanism 15 through a hardware circuit such as an acquisition card, thereby controlling the marking mechanism 15 to perform marking. However, this method requires the setting of a hardware circuit that supports the output of the hardware frame signal, which makes the system complex and difficult to implement. In addition, the hardware frame signal has poor stability, making the marking less accurate. In this embodiment, the programmable logic controller 14 uses a pulse signal counting method to control the marking mechanism 15 to perform marking. There is no need for the host computer 12 to output a hardware frame signal to the marking mechanism 15. Therefore, there is no need to set up a hardware circuit, which effectively reduces the system complexity and is easier to implement. In addition, the pulse signal is more stable. In this way, the marking mechanism 15 can accurately mark the defect position of the electrode. In some embodiments, the marking mechanism 15 is located downstream of the detection mechanism 11, and the first distance between the detection mechanism 11 and the marking mechanism 15 is set to the sum of the size of M+1 images and the redundant distance, where the size of a single image is the length of the electrode area captured in the image in the first direction.

[0107] In some embodiments of the present application, it takes a certain amount of time for the host computer 12 to determine the defective area of ​​the electrode based on the image. During the defective area detection process, the system 10 will continue to transport the electrode along the first direction to the marking mechanism 15. Therefore, in order to avoid the marking mechanism 15 not responding in time, resulting in failure to mark the defective area, the sum of the size of the M+1 images and the redundant distance can be used as the first distance.

[0108] The first distance between the detection mechanism 11 and the marking mechanism 15 can be set according to the following formula (1): L1=(M+1)*L0+L3 (1)

[0109] In formula (1), L1 represents the first distance, L0 represents the size of a single image captured by the detection mechanism 11, and L3 represents the redundant distance. M can be a preset natural number greater than or equal to 1, and the redundant distance can be set according to actual conditions.

[0110] The reason for setting the redundant distance is that it takes a certain amount of time from the time the programmable logic controller 14 outputs the marking instruction to the time the marking mechanism 15 responds to the marking instruction to ensure that the target is met. During this period, the electrode is still moving toward the marking mechanism 15. Therefore, the redundant distance is set to ensure that the marking mechanism 15 can accurately mark the defect location. The redundant distance can be determined based on the time required from the time the programmable logic controller 14 outputs the marking instruction to the time the marking mechanism 15 responds to the marking instruction to ensure that the target is met, as well as the conveying speed of the electrode.

[0111] In some embodiments of the present application, the sum of the transmission time of the marking instruction and the response time of the marking mechanism 15 can be used as the time required from the programmable logic controller 14 outputting the marking instruction to the marking mechanism 15 making a standard-compliant response based on the marking instruction, and the product of this time and the maximum conveying speed of the electrode in the system 10 can be used as the redundant distance. Among them, the transmission time of the marking instruction refers to the time required for the marking instruction to be transmitted from the programmable logic controller 14 to the marking mechanism 15, and the response time of the marking mechanism 15 refers to the time from the marking mechanism 15 receiving the marking instruction to making a marking response.

[0112] The redundancy distance can be calculated according to the following formula (2): L3 = (T0 + T1) * V max (2)

[0113] In formula (2), T0 represents the response time of the marking mechanism 15, T1 represents the transmission time of the marking instruction, and V max is the maximum conveying speed of the electrode in the system 10.

[0114] In some embodiments of the present application, in order to make the first distance between the marking mechanism 15 and the detection mechanism 11 more reasonable, neither too long to waste design space nor too short to cause the marking mechanism 15 to respond in time, the value of M can be set to 1. Based on this, the first distance can be the sum of the size of the two images and the redundant distance. The first distance can be calculated according to the following formula (3): L1 = 2*L0 + L3 (3)

[0115] In addition, in some embodiments of the present application, in order to prevent the reserved distance between the detection mechanism 11 and the marking mechanism 15 from being too extreme, the actual redundant distance can be calculated based on the theoretical value of the redundant distance plus 20% of the theoretical value.

[0116] Based on the above design, the host computer 12 can determine the response distance of the marking mechanism 15 in the following manner:

[0117] Determine a second distance between the defect area and the second edge of the target pole piece area, where the target pole piece area includes a first edge and a second edge, and the direction from the first edge to the second edge is a first direction; determine the sum of the second distance and the redundant distance as the response distance of the marking mechanism 15.

[0118] Correspondingly, the host computer 12 can immediately send the pulse number S to the programmable logic controller 14 when it is determined that the detection mechanism 11 has finished taking the N+Mth image of the electrode.

[0119] In this embodiment, because the detection mechanism 11 remains stationary when capturing the electrode, and the system 10 transports the electrode toward the marking mechanism 15 along the first direction, the size of a single image captured by the detection mechanism 11 can be understood as the distance the electrode moves toward the marking mechanism 15 during the period when the detection mechanism 11 captures the image. Based on this, the size of the M+1 images can be understood as the total distance the electrode moves toward the marking mechanism 15 from the time the detection mechanism 11 starts capturing the Nth image of the electrode to the time the N+Mth image of the electrode is captured. The first distance between the detection mechanism 11 and the marking mechanism 15 is the sum of the size of the M+1 images and the redundant distance. Therefore, when the detection mechanism 11 has taken the N+Mth image of the electrode, the distance between the second edge of the target electrode area corresponding to the Nth image and the marking mechanism 15 is only the redundant distance. Considering that the defective area is not necessarily located at the second edge of the target electrode area, in order to enable the marking mechanism 15 to accurately mark the defective area of ​​the electrode, the first distance between the defective area and the second edge of the target electrode area is further determined, and the sum of the first distance and the redundant distance is used as the response distance of the marking mechanism 15. After obtaining the response distance, the number of pulses S required to wait from the time the detection mechanism takes the N+Mth image of the electrode to the time the defective area moves to the position of the marking mechanism 15 is determined based on the response distance and the accuracy of the encoder 13. The number of pulses S is sent to the programmable logic controller 14 as marking information. Among them, the accuracy of the encoder 13 is used to indicate the distance value corresponding to each pulse output by the encoder 13.

[0120] In some specific examples, taking M as 1 as an example, as shown in FIG2 , the marking logic can be modeled, which includes the detection mechanism 11, the marking mechanism 15, and the size of the Nth image and the size of the N+1th image of the electrode obtained by the detection mechanism 11. In this embodiment, the size of each image is consistent, which is L0. The second distance is determined to be L2 based on the position of the defect area in the target electrode area. The conveying direction of the electrode is the first direction X. The first distance between the detection mechanism 11 and the marking mechanism 15 is L1, the redundant distance is L3, the accuracy of the encoder 13 is P0, and the maximum conveying speed of the electrode in the system 10 is V max The response time of the marking mechanism 15 is T0, and the transmission time of the marking instruction is T1. The units of L0|, L1, L2, L3 and P0 are consistent, which can be millimeters. The time units of T0 and T1 are consistent, which can be seconds. maxThe unit can be mm / s. Based on this, the host computer 12 can use the sum of the size of the Nth image and the size of the N+1th image, that is, 2*L0, as the total distance the electrode moves toward the marking mechanism 15 from the time the detection mechanism 11 starts to capture the Nth image of the electrode to the time the N+1th image of the electrode is captured. The redundant distance L3 is obtained by subtracting the total distance 2*L0 of the movement of the electrode toward the marking mechanism 15 from the first distance L1. The sum of the second distance L2 and the redundant distance L3 is used as the response distance of the marking mechanism 15. The ratio of the response distance to the accuracy P0 of the encoder 13 is determined as the number of pulses S.

[0121] The number of pulses S can be determined according to the following formula (4): S = (L1-2*L0+L2) / P0 (4)

[0122] Through the above-mentioned method, precise control of the marking mechanism 15 can be achieved, so that the marking mechanism 15 can accurately mark the defective area in the electrode.

[0123] Furthermore, the image captured by the detection mechanism 11 includes a tab area image corresponding to the tab area.

[0124] Based on this, the host computer 12 is further configured to identify the edge of the tab region image and determine the size of the tab region based on the edge.

[0125] In this way, the size of the tab area in the pole piece can be obtained through the host computer 12 .

[0126] In some embodiments, the image captured by the detection mechanism 11 can be a color image or a grayscale image. When the image is a grayscale image, the host computer 12 can directly identify the edge of the image of the tab area in the image based on the grayscale value; when the image is a color image, the host computer 12 can first convert the image into a grayscale image, and then identify the edge of the image of the tab area in the converted image based on the grayscale value.

[0127] In some embodiments of the present application, the electrode may include multiple areas. For example, when the electrode is an anode electrode, the electrode may include a lug area and a coating area. When the electrode is a cathode electrode, the electrode may include a lug area, a coating area, and a ceramic area, also referred to as an AT area. Among them, the grayscale value intervals of the image areas corresponding to different areas in the image taken by the detection mechanism 11 are different. Based on this, the host computer 12 can determine the edge of the lug area image in the image through Blob analysis. Blob refers to a connected area in the image, also known as a connected domain. Blob analysis is a commonly used analysis tool in image processing and is widely used in object detection, recognition, and tracking. The essence of Blob analysis is to group pixels with the same grayscale value range together based on different neighborhood types and regard them as the same detection object. In this way, the position where the grayscale value changes significantly can be determined, and the position where the grayscale value changes significantly is the edge of the regional image. Based on this, the edge of the lug area image can be determined based on the grayscale value interval corresponding to the lug area.

[0128] After identifying the edge of the tab region image, the host computer 12 can determine the size of the tab region based on the edge in the following manner:

[0129] Generate a first edge point at the edge; eliminate discrete edge points in the first edge point to obtain a second edge point; perform straight line fitting on the second edge point to obtain two edge lines in a second direction, where the second direction is perpendicular to the first direction; and determine the distance between the two edge lines as the size of the tab area.

[0130] In some embodiments of the present application, taking the electrode as an anode electrode as an example, a partial area of ​​the image captured by the detection mechanism 11 is shown in FIG4 , wherein e represents the image area corresponding to other mechanisms outside the electrode, such as the image area corresponding to the detection roller for supporting the electrode, f represents the image area corresponding to the tab area in the electrode, i.e., the tab area image, and g represents the image area corresponding to the coating area in the electrode. The host computer 12 can use a caliper tool to generate a fork edge point at the edge of the tab area image f, then filter out discrete abnormal edge points, and use the remaining edge points to fit two edge lines y1 and y2 in the second direction Y by straight line fitting, and obtain the distance d between the midpoints of the two edge lines to obtain the size of the tab area.

[0131] In this way, the size of the tab region in the second direction can be obtained.

[0132] In some embodiments, the system 10 may further include a slitting mechanism 16 .

[0133] The cutting mechanism 16 is used to cut the first pole piece of the input system 10 into a plurality of second pole pieces, wherein the width of the first pole piece is greater than that of the second pole piece.

[0134] Based on this, the electrode sheets in the system 10 may include a first electrode sheet before slitting and a plurality of second electrode sheets obtained after the first electrode sheet is slitting by the slitting mechanism 16. The first electrode sheet is the electrode sheet input into the system 10, usually the electrode sheet after rolling, and the second electrode sheet is the electrode sheet to be output from the system 10. After the second electrode sheet is output from the system 10, it can be reeled up by the reeling mechanism. The first electrode sheet includes a first surface and a second surface along the thickness direction. Since the second electrode sheet is obtained by slitting the first electrode sheet, the second electrode sheet also includes a first surface and a second surface along the thickness direction. The first surfaces of the plurality of second electrode sheets can collectively constitute the first surface of the first electrode sheet, and the second surfaces of the plurality of second electrode sheets can collectively constitute the second surface of the first electrode sheet.

[0135] In order to avoid missing the electrodes in the system 10, the detection mechanism 11 included in the system 10 may include a first detection mechanism arranged upstream of the slitting mechanism 16 and multiple second detection mechanisms arranged downstream of the slitting mechanism 16. The multiple second detection mechanisms correspond one-to-one to the multiple second electrodes, that is, in the system 10, a second detection mechanism is respectively arranged for each second electrode obtained by slitting.

[0136] The first detection mechanism is used to capture the first surface of the first pole piece based on the frequency of the pulse signal to obtain a first image;

[0137] a plurality of second detection mechanisms, configured to photograph the second surfaces of the plurality of second pole pieces based on the frequency of the pulse signal to obtain a plurality of second images;

[0138] The host computer 12 is used to determine the size of the defect area and the tab area of ​​the first pole piece and / or the plurality of second pole pieces based on the first image and / or the plurality of second images.

[0139] In some examples, the slitting mechanism 16 can slit the first electrode into two second electrode pieces. Based on this, as shown in FIG3 , the system 10 can include three detection points, wherein the detection point A is located upstream of the slitting mechanism 16, and the detection points B and C are located downstream of the slitting mechanism 16. A first detection mechanism 11-1 is provided at the detection point A, and a second detection mechanism 11-2 is provided at each of the detection points B and C. In this way, the first detection mechanism 11-1 provided at the detection point A can capture an image of the first surface of the first electrode piece, the second detection mechanism 11-2 provided at the detection point B can capture an image of the second surface of one of the second electrode pieces obtained by slitting, and the second detection mechanism 11-2 provided at the detection point C can capture an image of the second surface of the other second electrode piece obtained by slitting.

[0140] Since the multiple second pole pieces are obtained by cutting the first pole piece, the first image contains the images of the first surfaces of the multiple second pole pieces. Similarly, the multiple second images can constitute a complete image of the second surface of the first pole piece. In this way, by setting the first detection mechanism 11-1 and the multiple second detection mechanisms 11-2, it is possible to detect defects on the first surface and the second surface of each pole piece in the pole piece rolling and cutting system 10 and determine the size of the pole ear area of ​​each pole piece.

[0141] In some embodiments, the system 10 may further include a correction mechanism 17 .

[0142] As shown in FIG. 5 , the correction mechanism 17 can be connected to the host computer 12 via the main device switch 18 .

[0143] The host computer 12 can also be used to determine the correction value of the system 10 based on the sizes of multiple tab areas determined from the multiple second images taken by the multiple second detection mechanisms 11 - 2 , and send the correction value to the correction mechanism 17 .

[0144] The correction mechanism 17 is used to correct the system 10 based on the correction value.

[0145] In an embodiment of the present application, correcting the system 10 may include adjusting the position of the first pole piece after the offset occurs so that the width of the tab region cut along the width direction when the slitting mechanism 16 slits the first pole piece can be kept consistent. The correcting mechanism 17 may adjust the position of the first pole piece, including adjusting its angle in the system, its position in the width direction, etc., so that the cutter position of the slitting mechanism 16 is aligned with the central axis of the cutting position.

[0146] In this way, the deviation of the pole piece rolling and slitting system 10 can be corrected, thereby improving the product quality of the pole piece rolling and slitting system 10 .

[0147] In some embodiments, the host computer 12 may determine the deviation correction value of the system 10 in the following manner:

[0148] Determining a size difference between each pair of tab regions among the plurality of tab regions, wherein each pair of tab regions is two tab regions located on both sides of a same cutting position;

[0149] The correction value is determined based on the size difference.

[0150] In some embodiments of the present application, the slitting mechanism 16 can cut the first electrode piece at multiple slitting positions, so that multiple pairs of pole lug areas can be obtained. Based on this, when determining the correction value, the size difference of each pair of pole lug areas can be calculated separately, and then the average value of the size difference of multiple pairs of pole lug areas can be used as the correction value.

[0151] In some specific examples, the first electrode 610 is the anode electrode as shown in Figure 6, wherein the shaded area is the smear area, and the blank area is the pole lug area. The first electrode 610 includes two cutting positions F and G. When the cutting mechanism 16 cuts the first electrode 610, it cuts at the F position and the G position respectively, thereby cutting to obtain the first second electrode 611-1, the second second electrode 611-2 and the third second electrode 611-3 as shown in Figure 7, wherein the right pole lug area of ​​the first second electrode 611-1 and the left pole lug area of ​​the second second electrode 611-2 correspond to the same cutting position F, so these two pole lug areas can be used as a pair of pole lug areas, and the right pole lug area of ​​the second second electrode 611-2 and the left pole lug area of ​​the third second electrode 611-3 correspond to the same cutting position G, so these two pole lug areas can be used as a pair of pole lug areas. Based on this, the upper computer 12 can calculate the first size difference between the right side pole ear area of ​​the first second pole piece 611-1 and the left side pole ear area of ​​the second second pole piece 611-2, as well as the second size difference between the right side pole ear area of ​​the second second pole piece 611-2 and the left side pole ear area of ​​the third second pole piece 611-3, and use the average value of the first size difference and the second size difference as the correction value of the system 10.

[0152] The correction value of the system 10 can be calculated according to the following formula (5):

[0153] In formula (5), F represents the correction value, D1 represents the size of the right side tab area of ​​the second pole piece 611 ranked first, D2 represents the size of the left side tab area of ​​the second pole piece 611 ranked second, D3 represents the size of the right side tab area of ​​the second pole piece 611 ranked second, and D4 represents the size of the left side tab area of ​​the second pole piece 611 ranked third.

[0154] In the above manner, a correction value that can characterize the dimensional consistency of the tab area of ​​the second pole piece can be obtained, so that when the correction mechanism 17 corrects the pole piece rolling and slitting system 10 based on the correction value, the dimensional consistency of the multiple tab areas obtained by slitting can be improved.

[0155] In some embodiments, referring to FIG8 , the host computer 12 may determine the defective area of ​​the electrode piece based on the Nth image of the electrode piece by using the following steps S81 to S84:

[0156] S81. Extract the target image area corresponding to the target detection area of ​​the pole piece from the Nth image of the pole piece.

[0157] In some embodiments of the present application, the surface of the electrode generally includes multiple areas. For example, the surface of the anode electrode generally includes a tab area and a coating area, and the surface of the cathode electrode generally includes a tab area, a coating area, and a ceramic area. The target inspection area can be any area that requires surface defect inspection selected from the areas included in the electrode according to actual needs. For example, if the electrode in the system 10 is an anode electrode, the coating area in the electrode can be used as the target inspection area; if the electrode in the system 10 is a cathode electrode, the coating area and ceramic area in the electrode can be used as the target inspection area.

[0158] Different regions in the electrode sheet correspond to different grayscale value intervals in the image. Based on this, the image can be segmented into multiple image regions based on the grayscale value intervals corresponding to each region, with each image region corresponding to each grayscale value interval. The image region corresponding to the target grayscale value interval corresponding to the target detection area in the multiple image regions is then used as the target image region.

[0159] In some embodiments of the present application, the Nth image of the pole piece can be a grayscale image or a color image. When the image is a grayscale image, the target image area can be determined directly from the image. When the image is a color image, the image can be converted into a grayscale image first, and then the target image area can be determined from the converted image.

[0160] In some embodiments of the present application, the grayscale value interval corresponding to each area in the electrode can be set in advance based on actual needs before the detection mechanism 11 is used to capture the electrode image. In order to make the grayscale value interval of the image area corresponding to the electrode in the image consistent with the grayscale value interval corresponding to the electrode, the detection mechanism 11 can be adjusted based on the grayscale value interval of each area before the detection mechanism 11 is used to capture the electrode image, so that the grayscale value interval of the image area corresponding to each area in the image collected by the detection mechanism 11 is consistent with the set grayscale value interval.

[0161] S82. Binarize the target image area to obtain a binary image of the target detection area.

[0162] In some embodiments of the present application, a binarization threshold can be set according to the target grayscale value interval corresponding to the target image area, and the target image area can be binarized according to the binarization threshold to obtain a binary image of the surface of the target detection area. The binarization threshold can include the upper limit and lower limit of the target grayscale value interval. In this way, the pixels in the target image area that belong to the target grayscale value interval and the pixels that do not belong to the target grayscale value interval can be distinguished through the binarization process. The image corresponding to the pixels in the binarized image that belong to the target grayscale value interval is used as the background image, and the image corresponding to the pixels that do not belong to the target grayscale value interval is used as the foreground image. The foreground image is the image corresponding to the surface defects of the target detection area.

[0163] S83. Filter out target regions whose areas are greater than or equal to the defect area threshold and whose widths are greater than or equal to the defect width threshold from the foreground image of the binary image.

[0164] Considering that the effect of defects of smaller size on the performance of the electrode can be ignored, when detecting defective areas, only the defective areas that have an impact on the performance of the electrode can be detected.

[0165] In some embodiments of the present application, the connected domains of the foreground image in the binary image can be marked through Blob analysis, and the area and width of each marked connected domain are calculated. The area of ​​each connected domain is compared with a preset defect area threshold. If the area of ​​the connected domain is greater than or equal to the defect area threshold, the width of the connected domain is further compared with a preset defect width threshold. If the width of the connected domain is greater than or equal to the defect width threshold, the connected domain is marked as a target area.

[0166] S84. Determine the target area as the defective area of ​​the electrode.

[0167] In this way, the defective areas in the target inspection area that have an impact on the performance of the electrode can be accurately detected.

[0168] In some embodiments, referring to FIG9 , the detection mechanism 11 may include a camera 111, a light source 112, and a detection roller 113. As shown in FIG9 , the camera 111 and the light source 112 in the detection mechanism 11 are both arranged toward the detection roller 113. The detection roller 113 is used to support the electrode piece so that the first surface or the second surface of the electrode piece to be photographed faces the camera 111, and the light source 112 is used to illuminate the side of the electrode piece facing the camera 111.

[0169] Taking the first detection mechanism 11-1 as an example, referring to Figure 11, the first detection mechanism 11-1 may include a first camera 111-1, a first light source 112-1, and a first detection roller 113-1. The first camera 111-1 is arranged toward the first detection roller 113-1; the first detection roller 113-1 is used to support the first pole piece so that the first surface of the first pole piece faces the first camera 111-1; the first light source 112-1 is used to illuminate the first surface of the first pole piece; and the first camera 111-1 is used to photograph the illuminated first surface of the first pole piece.

[0170] Taking the second detection mechanism 11-2 as an example, see Figure 12, the second detection mechanism 11-2 may include a second camera 111-2, a second light source 112-2 and a second detection roller 113-2. The second camera 111-2 in the second detection mechanism 11-2 is arranged toward the second detection roller 113-2; the second detection roller 113-2 is used to support the second pole piece so that the second surface of the second pole piece faces the second camera 111-2 in the second detection mechanism 11-2; the second light source 112-2 is used to illuminate the second surface of the second pole piece; the second camera 111-2 is used to photograph the second surface of the second pole piece after illumination.

[0171] In this way, by providing the light source 112 and the detection roller 113 , it is easier for the detection mechanism 11 to photograph the surface of the pole piece, and defects on the surface of the pole piece can be more prominent in the image.

[0172] In some embodiments, in order to improve the efficiency of rolling and slitting the electrode sheets, the system 10 can slit wide electrode sheets and perform online detection of defects and dimensions of wide electrode sheets. For each detection mechanism 11, multiple cameras 111 and multiple light sources 112 corresponding to the multiple cameras 111 can be set therein. The multiple cameras 111 and the multiple light sources 112 are all set toward the detection roller 113, and the multiple cameras 111 can be set side by side along the width direction of the electrode sheet. In the same detection mechanism 11, the multiple cameras 111 synchronously shoot the same surface of the electrode sheet on the detection roller 113. Since the multiple cameras 111 are set at different positions, the areas of the electrode sheet shot are different. At this time, the multiple images synchronously captured by the multiple cameras 111 can be spliced, and the overlapping areas in the spliced ​​images are subtracted to obtain a complete image of the electrode sheet. The host computer 12 can detect the defective area of ​​the electrode sheet based on the spliced ​​complete image.

[0173] In some examples, one detection mechanism 11 may include two cameras 111 . As shown in FIG. 10 , the two cameras 111 may be arranged side by side along the second direction Y.

[0174] In this way, the system 10 can realize defect detection of wide-width pole pieces and dimension detection of the pole tab area.

[0175] In some embodiments, the camera 111 may be a line scan camera, so that images of high-speed moving pole pieces can be captured.

[0176] In some embodiments, the pole piece usually includes multiple areas, so the image of the pole piece includes image areas corresponding to the multiple areas, and when the pole piece is supported by the detection roller 113, the image may also include the image area corresponding to the detection roller 113. In view of this, in order to facilitate the distinction between the image areas corresponding to the various areas in the pole piece and the detection roller 113 in the image, the illumination angle of the light source 112 in the detection mechanism 11 and the shooting angle and shooting point of the camera 111 can be set according to the set grayscale value range corresponding to each area.

[0177] Furthermore, the working distance of camera 111 can be set based on the focal length of the lens in camera 111. The working distance of camera 111 refers to the distance between camera 111 and detection roller 113. Generally, the smaller the lens focal length, the shorter the camera's working distance. For example, if camera 111 is a 16K line scan camera, with a pixel size of 3.5 μm and a chip target surface of 57.3 mm, and a lens with a focal length of 40 mm, the camera's field of view is 900 mm. Therefore, the working distance of camera 111 can be set to 650 mm.

[0178] In some specific examples, if the electrode in the system 10 is an anode electrode, the current collector of the anode electrode is copper foil, and the material is carbon powder, when the grayscale value interval corresponding to the detection roller 113 is set to 0-10, the grayscale value interval corresponding to the tab area is set to 255, and the grayscale value interval corresponding to the coating area is set to 40-60, the shooting angle of the camera 111, the irradiation angle of the light source 112 and the shooting point are set based on the above grayscale value intervals, and the anode electrode in the system 10 is photographed by the camera 111, an image as shown in Figure 13 can be obtained, where e in Figure 11 represents the image area corresponding to the detection roller 113, f represents the image area corresponding to the tab area in the anode electrode, and g represents the image area corresponding to the coating area in the anode electrode.

[0179] In some embodiments of the present application, if the electrode in the system 10 is a cathode electrode, the material of the cathode electrode is aluminum foil, and there are ceramic areas on both sides of the coating area, when the grayscale value interval corresponding to the detection roller 113 is set to 0-10, the grayscale value interval corresponding to the pole ear area is set to 255, the grayscale value interval corresponding to the coating area is set to 20-40, and the grayscale value interval corresponding to the ceramic area is set to 110-130, the shooting angle of the camera 111, the illumination angle of the light source 112, and the shooting point are set based on the above grayscale value intervals, and the cathode electrode in the system 10 is photographed by the camera 111, and an image as shown in Figure 14 can be obtained. In Figure 14, e represents the image area corresponding to the detection roller 113, f represents the image area corresponding to the pole ear area in the cathode electrode, h represents the image area corresponding to the ceramic area in the cathode electrode, and g represents the image area corresponding to the coating area in the cathode electrode.

[0180] In this way, the grayscale value intervals corresponding to different areas in the detection image can be different, which makes it easier to distinguish the image areas corresponding to different areas.

[0181] Based on the pole piece rolling and slitting system provided in the above embodiment, the present application also provides a specific implementation of a pole piece rolling and slitting method. Please refer to the following embodiment.

[0182] 15 is a flow chart of a pole piece rolling and slitting method according to an embodiment of the present application. As shown in FIG15 , the method may include the following steps S151 to S158:

[0183] S151. The encoder outputs a pulse signal to the detection mechanism and the programmable logic controller during the process of transporting the pole piece in the pole piece roller slitting system in the first direction;

[0184] S152. An image of the pole piece is captured by a detection mechanism based on the frequency of the pulse signal;

[0185] S153. Determine the defective area of ​​the electrode based on the Nth image of the electrode captured by the detection mechanism through the host computer, where N is a natural number;

[0186] S154. The host computer determines the response distance of the marking mechanism based on the position of the defect area in the target electrode area, where the target electrode area is the electrode area captured by the Nth image;

[0187] S155. The programmable logic controller determines the number of pulses S it needs to wait for based on the response distance and the accuracy of the encoder, where S is a natural number;

[0188] S156 sends the pulse number S to the programmable logic controller through the host computer;

[0189] S157. After determining that the programmable logic controller has waited for S pulses, the programmable logic controller sends a marking instruction to the marking mechanism.

[0190] S158. Mark the defective area of ​​the electrode based on the marking instruction through the marking mechanism.

[0191] In the above manner, the defective area in the pole piece can be determined, and the defective area can be accurately marked based on the position of the defective area in the pole piece.

[0192] In some embodiments, the marking mechanism is located downstream of the detection mechanism, and the first distance between the detection mechanism and the marking mechanism is the sum of the size of M+1 images and the redundant distance, and the size of a single image is the length of the pole piece area captured in the image in the first direction, where M is a natural number;

[0193] The host computer determines the response distance of the marking mechanism based on the position of the defect area in the target electrode area, which may include:

[0194] Determine, by the host computer, a second distance between the defective area and a second edge of the target pole piece area, where the second edge is an edge of the target pole piece area in the pole piece transmission direction;

[0195] Determining the sum of the second distance and the redundant distance as the response distance of the marking mechanism;

[0196] Accordingly, the pulse number S is sent to the programmable logic controller through the host computer, including:

[0197] When the host computer determines that the detection mechanism has taken the N+Mth image of the electrode, the pulse number S is sent to the programmable logic controller.

[0198] In this way, the marking mechanism can be precisely controlled to mark the defective position of the electrode.

[0199] Furthermore, the image captured by the detection mechanism includes an image of the tab area corresponding to the tab area. Based on this, the pole piece rolling and slitting method further includes:

[0200] The edge of the tab area image is identified by the host computer, and the size of the tab area is determined based on the edge.

[0201] In addition, the size information of the tab area in the electrode can also be obtained through the host computer.

[0202] In some embodiments, the electrode sheet in the electrode sheet rolling and slitting system includes a first electrode sheet input into the system and a plurality of second electrode sheets obtained by slitting the first electrode sheet by a slitting mechanism, the detection mechanism includes a first detection mechanism and a plurality of second detection mechanisms, the plurality of second detection mechanisms correspond one-to-one to the plurality of second electrode sheets, and the detection mechanism captures an image of the electrode sheet based on the frequency of the pulse signal, including:

[0203] photographing the first surface of the first pole piece based on the frequency of the pulse signal by a first detection mechanism to obtain a first image;

[0204] The second surfaces of the plurality of second pole pieces are photographed based on the frequency of the pulse signal by the plurality of second detection mechanisms to obtain a plurality of second images.

[0205] Accordingly, determining the defective area of ​​the electrode piece based on the Nth image of the electrode piece taken by the detection mechanism by the host computer may include:

[0206] The host computer determines the defective area of ​​the first surface based on the Nth first image taken by the first detection mechanism, and / or the host computer determines the defective area of ​​the second surface based on the Nth second image taken by the second detection mechanism.

[0207] In addition, identifying the edge of the tab region image by the host computer and determining the size of the tab region based on the edge may include:

[0208] The host computer determines the size of the tab area in the first pole piece based on the first image captured by the first detection mechanism, and / or the host computer determines the size of the tab area in the second pole piece based on the second image captured by the second detection mechanism.

[0209] In this way, by setting up the first detection mechanism and multiple second detection mechanisms, it is possible to detect defects on the first surface and the second surface of each pole piece in the pole piece rolling and slitting system and determine the size of the pole lug area of ​​each pole piece.

[0210] In some embodiments, determining the size of the tab region based on the edge may include:

[0211] generating a first edge point at the edge;

[0212] Eliminate the discrete edge points in the first edge points to obtain the second edge points;

[0213] Performing straight line fitting on the second edge points to obtain two edge lines in a second direction, where the second direction is perpendicular to the first direction;

[0214] The distance between the two edge lines is determined as the size of the tab area.

[0215] In this way, the size of the tab region in the second direction can be obtained.

[0216] In some embodiments, the pole piece rolling and slitting method may further include:

[0217] Determining the pole piece rolling and slitting correction value by the host computer according to the sizes of the plurality of pole tab areas determined from the plurality of second images, and sending the correction value to the correction mechanism;

[0218] The correction mechanism corrects the pole piece roller slitting based on the correction value.

[0219] In this way, the deviation of the pole piece rolling and slitting system can be corrected, and the product quality of the pole piece rolling and slitting system can be improved.

[0220] In some embodiments, determining the pole piece rolling and slitting correction value by the host computer according to the sizes of the plurality of pole tab areas identified from the plurality of second images includes:

[0221] Determine, by a host computer, a size difference between each pair of tab regions among the plurality of tab regions, wherein each pair of tab regions is two tab regions located on both sides of the same cutting position;

[0222] The correction value is determined based on the size difference.

[0223] In this way, a correction value that can characterize the dimensional consistency of the tab area of ​​the second pole piece can be obtained.

[0224] In some embodiments, determining the defective area of ​​the electrode piece based on the Nth image of the electrode piece taken by the detection mechanism by the host computer includes:

[0225] Extracting the target image area corresponding to the target detection area of ​​the pole piece from the Nth image of the pole piece by the host computer;

[0226] Binarize the target image area to obtain a binary image of the target detection area;

[0227] Filtering out target regions whose area is greater than or equal to an area threshold and whose width is greater than or equal to a width threshold from a foreground image of a binary image;

[0228] The target area is determined as the defective area of ​​the electrode.

[0229] In some embodiments, photographing the first surface of the first pole piece based on the frequency of the pulse signal by the first detection mechanism to obtain the first image includes:

[0230] supporting the first pole piece by a first detection roller so that the first surface of the first pole piece faces the first camera;

[0231] lighting the first surface by using a first light source;

[0232] The illuminated first surface is photographed by the first camera based on the frequency of the pulse signal to obtain a first image.

[0233] In this way, the defects on the first surface of the first pole piece can be made more prominent in the first image.

[0234] In some embodiments, photographing the second surface of the second pole piece based on the frequency of the pulse signal by the second detection mechanism to obtain a second image includes:

[0235] supporting the second pole piece by the second detection roller so that the second surface of the second pole piece faces the second camera;

[0236] lighting the second surface by a second light source;

[0237] The second camera captures the illuminated second surface based on the frequency of the pulse signal to obtain a second image.

[0238] In this way, the defects on the second surface of the second pole piece can be made more prominent in the second image.

[0239] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A pole piece rolling and slitting system, wherein: include: an encoder for outputting pulse signals to a detection mechanism and a programmable logic controller respectively during a process in which a pole piece in the system is conveyed along a first direction; The detection mechanism is used to capture an image of the pole piece in the pole piece rolling and slitting system based on the frequency of the pulse signal; A host computer, configured to determine a defective area of ​​the electrode piece based on an Nth image of the electrode piece captured by the detection mechanism, where N is a natural number; The host computer is further configured to determine a response distance of the marking mechanism based on the position of the defective area in a target electrode area, wherein the target electrode area is the electrode area captured by the Nth image; and determine a number of pulses S that a programmable logic controller needs to wait for based on the response distance and the accuracy of the encoder; Sending the pulse number S to the programmable logic controller, where S is a natural number; The programmable logic controller is used to send a marking instruction to the marking mechanism when it is determined that S pulses have been waited; The marking mechanism is used to mark the defective area of ​​the electrode based on the marking instruction; The image captured by the detection mechanism includes an image of the tab area corresponding to the tab area; The host computer is further configured to identify edges of the tab region image and determine the size of the tab region based on the edges.

2. The system according to claim 1, wherein: The marking mechanism is located downstream of the detection mechanism, and a first distance between the detection mechanism and the marking mechanism is the sum of the size of M+1 images and the redundant distance. The size of a single image is the length of the pole piece area captured in the image in the first direction, where M is a natural number; The host computer is configured to determine a second distance between the defective area and a second edge of the target electrode area, the target electrode area including a first edge and a second edge, the direction from the first edge to the second edge being the first direction; and determine the sum of the second distance and the redundant distance as the response distance of the marking mechanism; The host computer is further configured to send the pulse number S to the programmable logic controller when it is determined that the detection mechanism has taken the N+Mth image of the electrode.

3. The system according to claim 1 or 2, wherein: The pole piece rolling and slitting system further comprises a slitting mechanism; The slitting mechanism is used to slit the first pole piece input into the system into a plurality of second pole pieces, wherein the width of the first pole piece is greater than that of the second pole piece; The detection mechanism includes a first detection mechanism provided upstream of the slitting mechanism and a plurality of second detection mechanisms provided downstream of the slitting mechanism, wherein the plurality of second detection mechanisms correspond one to one to the plurality of second electrode sheets; The first detection mechanism is configured to capture the first surface of the first pole piece based on the frequency of the pulse signal to obtain a first image; The plurality of second detection mechanisms are configured to photograph the second surfaces of the plurality of second pole pieces based on the frequency of the pulse signal to obtain a plurality of second images; The host computer is used to determine the size of the defect area and the tab area of ​​the first pole piece and / or the plurality of second pole pieces based on the first image and / or the plurality of second images.

4. The system according to any one of claims 1 to 3, wherein: The host computer is used to generate a first edge point at the edge; eliminate discrete edge points in the first edge point to obtain a second edge point; perform straight line fitting on the second edge point to obtain two edge lines in a second direction, and the second direction is perpendicular to the first direction; and determine the distance between the two edge lines as the size of the tab area.

5. The system according to claim 3, wherein: The pole piece rolling and slitting system also includes a deviation correction mechanism; The host computer is further configured to determine a pole piece rolling and slitting correction value based on the sizes of the plurality of pole tab areas determined from the plurality of second images, and send the correction value to the correction mechanism; The correction mechanism is used to correct the pole piece roller slitting based on the correction value.

6. The system according to claim 5, wherein: The host computer is used to determine the size difference of each pair of tab areas among the plurality of tab areas, wherein each pair of tab areas is two tab areas located on both sides of the same cutting position; The correction value is determined based on the size difference.

7. The system according to any one of claims 1 to 6, wherein: The host computer is used to extract a target image area corresponding to the target detection area of ​​the pole piece from the Nth image of the pole piece; Binarizing the target image area to obtain a binary image of the target detection area; A target region having an area greater than or equal to an area threshold and a width greater than or equal to a width threshold is screened out from the foreground image of the binary image; and the target region is determined as a defective region of the electrode.

8. The system of claim 3, 5 or 6, wherein: The first detection mechanism further includes a first camera, a first light source and a first detection roller; The first camera is arranged toward the first detection roller; The first detection roller is used to support the first pole piece so that the first surface of the first pole piece faces the first camera; The first light source is used to illuminate the first surface; The first camera is used to photograph the illuminated first surface based on the frequency of the pulse signal to obtain the first image.

9. The system according to claim 3, 5 or 6, wherein: The second detection mechanism includes a second camera, a second light source and a second detection roller; The second camera is arranged toward the second detection roller; the second detection roller is used to support the second pole piece so that the second surface of the second pole piece faces the second camera; The second light source is used to illuminate the second surface; The second camera is used to photograph the illuminated second surface based on the frequency of the pulse signal to obtain the second image.

10. A pole piece rolling and slitting method, wherein: include: Outputting pulse signals to the detection mechanism and the programmable logic controller respectively through the encoder during the process of the pole piece in the pole piece rolling and slitting system being transported along the first direction; capturing an image of the pole piece based on the frequency of the pulse signal by the detection mechanism; Determining, by a host computer, a defective area of ​​the electrode piece based on the Nth image of the electrode piece taken by the detection mechanism, where N is a natural number; Determining, by the host computer, a response distance of the marking mechanism based on the position of the defective area in a target electrode area, wherein the target electrode area is the electrode area captured by the Nth image; Determining, by the host computer based on the response distance and the accuracy of the encoder, the number of pulses S that the programmable logic controller needs to wait, where S is a natural number; Sending the pulse number S to the programmable logic controller via the host computer; Sending a marking instruction to the marking mechanism by the programmable logic controller when it is determined that S pulses have been waited; Marking the defective area of ​​the electrode by the marking mechanism based on the marking instruction; The image captured by the detection mechanism includes an image of the tab area corresponding to the tab area, and the pole piece rolling and slitting method further includes: The upper computer identifies the edge of the tab region image, and determines the size of the tab region based on the edge.

11. The method according to claim 10, wherein: The marking mechanism is located downstream of the detection mechanism, and a first distance between the detection mechanism and the marking mechanism is the sum of the size of M+1 images and a redundant distance. The size of a single image is the length of the pole piece region captured in the image in the first direction, where M is a natural number. The determining, by the host computer, a response distance of the marking mechanism based on the position of the defective area in the target electrode area includes: Determining, by the host computer, a second distance between the defective area and a target edge of the target pole piece area, wherein the target edge is an edge of the target pole piece area in the pole piece transmission direction; Determining the sum of the second distance and the redundant distance as the response distance of the marking mechanism; The sending of the pulse number S to the programmable logic controller by the host computer includes: When the host computer determines that the detection mechanism has taken the N+Mth image of the electrode, the pulse number S is sent to the programmable logic controller.

12. The method according to claim 10 or 11, wherein: The electrode pieces in the electrode piece rolling and slitting system include a first electrode piece input into the system and a plurality of second electrode pieces obtained by slitting the first electrode piece by a slitting mechanism. The detection mechanism includes a first detection mechanism and a plurality of second detection mechanisms, the plurality of second detection mechanisms corresponding one-to-one to the plurality of second electrode pieces. The image of the electrode piece is captured by the detection mechanism based on the frequency of the pulse signal, including: photographing the first surface of the first pole piece based on the frequency of the pulse signal by the first detection mechanism to obtain a first image; The second surfaces of the plurality of second pole pieces are photographed by the plurality of second detection mechanisms based on the frequency of the pulse signal to obtain a plurality of second images.

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