Electrode sheet marking system and method

Abstract

Disclosed in the present application are an electrode sheet marking system and method. The electrode sheet marking system comprises an image acquisition apparatus and a processing apparatus, wherein the image acquisition apparatus is used for acquiring an electrode sheet roll in an unwinding process, so as to obtain a current image frame; the processing apparatus is in communication connection with the image acquisition apparatus, and is used for performing detection on the current image frame, and determining, when it is detected that there is a positioning mark in the current image frame, a marking moment for a target electrode sheet on the basis of an acquisition moment for a reference image frame corresponding to the current image frame; the target electrode sheet is an electrode sheet which can be distinguished by means of the detected positioning mark; and the marking moment is a moment at which a marking apparatus is triggered to mark the target electrode sheet. The above solution can realize the marking of an electrode sheet roll that has been provided with a positioning mark.

Description

Electrode marking system and method

[0001]

Cross-reference

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 6, 2023, with application number 2023116584223 and application name “Pole Marking System and Method”, the entire contents of which are incorporated by reference into this application.

Technical field

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

[0004] As living standards improve, people are increasingly using various batteries (battery packs) in their daily lives. The battery cell is the core component of the battery, and it contains both positive and negative electrodes. Therefore, the production and testing of the electrodes have a significant impact on the production of battery cells.

[0005] The existing electrode production process includes marking the electrode coils for electrode positioning and inspecting and marking each electrode. For example, inspecting the electrodes for defects and marking them accordingly. In the prior art, inspection and marking are usually performed in conjunction with the setting of positioning marks, and the two cannot be independent of each other. Therefore, inspection and marking cannot be performed on electrode coils that have already been marked with positioning marks.

[0006] [Summary of the invention]

[0007] The present application at least provides a pole piece marking system and method, which can solve the problem that pole piece coils with positioning marks already set cannot be inspected and marked.

[0008] The present application provides a pole piece marking system, including an image acquisition device and a processing device. The image acquisition device is used to acquire the pole piece coil in the unwinding process to obtain a current image frame. The pole piece coil includes a plurality of pole pieces, and the plurality of pole pieces are distinguished by corresponding positioning marks. The processing device is communicatively connected with the image acquisition device and is used to detect the current image frame. When a positioning mark is detected in the current image frame, the marking time of the target pole piece is determined based on the acquisition time of the reference image frame corresponding to the current image frame. The target pole piece is a pole piece that can be distinguished by the detected positioning mark. The reference image frame is the current image frame or other image frames acquired from the pole piece coil. The marking time is the time when the marking device is triggered to mark the target pole piece.

[0009] In the above scheme, the electrode marking system can capture images of the electrode coil, and on the basis of determining that the current image frame obtained by the capture contains the positioning mark, use the capture time of the reference image frame associated with the current image frame as a reference to obtain the marking time of the target electrode distinguished by the positioning mark in the current image frame, so as to realize the independent determination of the marking time of the electrode marked with the positioning mark without relying on the setting action of the positioning mark.

[0010] In some embodiments, the processing device is used to determine the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame, including: obtaining the transmission time required for the pole piece coil to move the target distance during the unwinding process, the target distance being the distance between the markable position of the target pole piece and the marking device at the acquisition time of the reference image frame; determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0011] In the above scheme, the processing device uses the acquisition time of the reference image frame as a reference, determines the time taken for the markable position of the target pole piece to move from the position at the acquisition time of the reference image frame to the marking device, and determines the marking time of the target pole piece, thereby being able to determine the marking time of the markable position of the target pole piece without relying on the setting time of the positioning mark, thereby improving the accuracy of the pole piece marking position.

[0012] In some embodiments, the processing device is used to determine the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame, including: taking the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, or, at the acquisition time of the reference image frame, determining the current marking waiting time of the target pole piece as the transmission time.

[0013] In the above scheme, the processing device can use the acquisition time and transmission time of the reference image frame to directly determine the exact time point corresponding to the marking time, or it can determine the current time after waiting for the transmission time at the acquisition time of the reference image frame as the marking time. It can flexibly choose to directly determine the time point of the marking time, or determine the current time after waiting as the marking time, and can flexibly adapt to different application scenarios.

[0014] In some embodiments, the image acquisition device is further used to send a notification signal to the processing device in response to capturing an image frame; the processing device is further used to receive the notification signal that the image acquisition device has captured an image frame, and record the capture time of the image frame in response to the notification signal to obtain the capture time of the reference image frame.

[0015] In the above scheme, when the processing device is able to record the acquisition time of the image frame, the acquisition time of the recorded reference image frame can be directly used in combination with the transmission time to obtain the exact time point of the marking moment, thereby determining the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0016] In some embodiments, the image acquisition device includes a camera and an acquisition card. The camera is used to capture the pole piece coil in the unwinding process to obtain an image frame; the acquisition card is communicatively connected to the camera and the processing device respectively, and is used to respond to the acquisition of the image frame, send a notification signal to the processing device, and send the image frame to the processing device so that the processing device can detect the current image frame.

[0017] In the above scheme, the acquisition card is configured to communicate with the camera and the processing device, so that when an image frame is acquired, a notification signal can be sent to the processing device. The processing device can record the acquisition time of the image frame in response to the notification signal, thereby obtaining the marking time, thereby determining the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0018] In some embodiments, the pole piece marking system further includes an encoder, which is communicatively connected to the processing device and the image acquisition device, respectively, for sending pulse signals to the processing device and the image acquisition device, respectively; the image acquisition device is used to perform image acquisition in response to the pulse signal; the processing device is used to record the acquisition moment of the image frame in response to the notification signal, including: recording the number of pulses emitted by the encoder at the acquisition moment of the image frame in response to the notification signal.

[0019] In the above scheme, an encoder capable of emitting pulses is set to trigger image acquisition and serve as a reference for the recording time, so that the number of pulses of the encoder is used to characterize the acquisition time of the image frame, and the acquisition time of the image frame can be accurately recorded to determine the marking time of the target pole piece, thereby improving the accuracy of the marking time.

[0020] In some embodiments, the reference image frame is another image frame after the current image frame. The processing device is also used to monitor whether the reference image frame has been acquired when a positioning mark is detected in the current image frame to obtain the acquisition time of the reference image frame. The acquisition time of the reference image frame is used as the starting time of the current marking waiting time of the target pole piece to obtain the marking time of the target pole piece.

[0021] In the above scheme, when it is impossible to record the acquisition time of the image frame, the processing device can also obtain the acquisition time of the reference image frame by monitoring the acquisition of the reference image frame that has not yet been acquired after the current image frame containing the positioning mark, and determine the time after the waiting time for transmission as the marking time, thereby realizing the determination of the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0022] In some embodiments, the processing device is used to obtain the transmission time required for the electrode coil to move the target distance during the unwinding process, including: using the preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame to determine the target distance; using the target distance to determine the transmission time.

[0023] In the above scheme, according to the position of the positioning mark in the current image frame, the processing device can associate the position of the positioning mark with the position of the image acquisition device at the time of acquisition of the current image frame, and combine the preset distance between the image acquisition device and the marking device, the distance between the positioning mark and the markable position, and the distance of the pole sheet movement between the current image frame and the reference image frame to obtain the target distance between the positioning mark and the marking device at the time of acquisition of the reference image frame, and thus the interval between the reference value of the acquisition time of the reference image frame and the marking time can be obtained, so that the marking time can be determined without relying on the setting time of the positioning mark.

[0024] In some embodiments, the pole piece marking system further includes an encoder, which is communicatively connected to the image acquisition device and is used to send a pulse signal to the image acquisition device; the image acquisition device is used to perform image acquisition in response to the pulse signal; the processing device is used to use the target distance to determine the transmission time, including: dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; the processing device is used to use the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, including: recording the pulse number of the encoder each time the image acquisition device acquires an image frame to obtain a second pulse number, the second pulse number being the pulse number recorded at the acquisition time of the reference image frame; determining that the marking of the target pole piece is triggered when the recorded pulse number reaches the sum of the first pulse number and the second pulse number.

[0025] In the above scheme, an encoder capable of emitting pulses is set to trigger image acquisition, and image acquisition is associated with pulses. The pulse number of the encoder can be used to directly determine the exact time point corresponding to the marking moment. The second pulse number is used to represent the acquisition moment of the reference image frame, and the first pulse number represents the transmission time. The moment when the pulse number is the sum of the first pulse number and the second pulse number is determined as the marking moment, which can trigger marking and improve the accuracy of the marking moment.

[0026] In some embodiments, the pole piece marking system further includes an encoder, which is communicatively connected to the image acquisition device and the processing device, respectively, and is used to send pulse signals to the processing device and the image acquisition device, respectively; the image acquisition device is used to perform image acquisition in response to the pulse signal; the processing device is used to use the target distance to determine the transmission time, including: dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; the processing device is used to determine the current marking waiting time of the target pole piece as the transmission time at the acquisition moment of the reference image frame, including: at the acquisition moment of the reference image frame, waiting for the encoder to send a pulse signal of the first pulse number before triggering the marking of the target pole piece.

[0027] In the above scheme, an encoder capable of emitting pulses is set to trigger image acquisition, and image acquisition is associated with pulses, so that marking is performed after waiting for the pulse signal of the first pulse number based on the pulse number corresponding to the acquisition moment of the reference image frame, thereby improving the accuracy of the marking moment.

[0028] In some embodiments, the processing device is also used to: find out several image frames that at least contain part of the target pole piece from multiple image frames acquired by the image acquisition device for the pole piece coil; perform defect detection on the target pole piece using the several image frames that at least contain part of the target pole piece to obtain a defect detection result of the target pole piece; and determine whether to trigger the marking device to mark the target pole piece based on the defect detection result of the target pole piece.

[0029] In the above scheme, the processing device can perform defect detection and obtain the defect detection results of the target electrode. It determines whether to trigger the marking device to mark the target electrode based on whether the target electrode contains defects. It can distinguish between normal electrodes and defective electrodes for reference in subsequent processing, thereby reducing the impact of defective electrodes.

[0030] In some embodiments, the processing device is used to determine whether to trigger the marking device to mark the target pole piece based on the defect detection result of the target pole piece, including: in response to the defect detection result indicating that the target pole piece does not have defects, canceling the marking signal sent to the marking device to mark the target pole piece, and the marking signal is used to instruct the marking device to mark the target pole piece as having defects; in response to the defect detection result indicating that the target pole piece has defects, retaining the marking signal sent to the marking device.

[0031] In the above scheme, the processing device adopts a default marking method, retaining the marking signal for the defective pole piece and canceling the marking signal for the non-defective pole piece, thereby marking the defective pole piece to distinguish normal pole pieces from defective pole pieces.

[0032] In some embodiments, there are multiple image acquisition devices, and the multiple image acquisition devices are respectively arranged at different positions for capturing images of different positions on the conveying path of the pole piece coil; at least two of the multiple image acquisition devices serve as target image acquisition devices, and each target image acquisition device is used to capture the pole piece coil in the unwinding process to obtain the current image frame of the target image acquisition device; the processing device is also used to: in response to the determination of the marking time of the target pole piece corresponding to a target image acquisition device, update the marking time of the target pole piece using the latest determined marking time of the target pole piece corresponding to the target image acquisition device.

[0033] In the above scheme, multiple image acquisition devices at different positions can be set to determine the marking time of the target pole piece. In the event that some image acquisition devices are abnormal, the marking time of the target pole piece can still be determined to improve the stability of the marking time determination.

[0034] In some embodiments, the target image acquisition device includes a first target image acquisition device provided before the electrode sheet coil is striped, and a second target image acquisition device provided after the electrode sheet coil is striped.

[0035] In the above scheme, the first target image acquisition device can determine the marking time of the pole piece before striping, and the second target image acquisition device can determine the marking time of the pole piece after striping, so that the stability of the marking time determination can be ensured by the image acquisition devices set before and after striping.

[0036] In some embodiments, the electrode coil is unwound using the unwinding device of the die-cutting and slitting machine, and the electrode coil is provided with a positioning mark before unwinding. During the unwinding process of the electrode coil, the mark setting device in the die-cutting and slitting machine for setting the positioning mark does not work.

[0037] In the above scheme, the electrode marking system can be applied to the electrode coil unwound by the die-cutting and slitting machine. When the marking setting device is not working, it can also achieve the moment of electrode marking on the electrode coil with the set positioning mark unwound by the die-cutting and slitting machine without relying on the moment of positioning mark setting.

[0038] In some embodiments, the positioning mark is a dividing mark used to divide two adjacent pole pieces.

[0039] In the above solution, the dividing mark divides the adjacent pole pieces and can be used as a positioning pole piece to distinguish the target pole piece on the pole piece coil.

[0040] In some embodiments, other image frames are acquired from the pole piece coil after the current image frame.

[0041] In the above solution, other image frames acquired after the current image frame can be flexibly selected as reference image frames, so that the acquisition time of the image frames acquired after the current image frame can be used as a reference for the marking time.

[0042] In some embodiments, the processing device includes: an image detection device for detecting the current image frame, and when a positioning mark is detected in the current image frame, determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame; or, the processing device includes: a communicatively connected image detection device and a marking control device, the image detection device is used to detect the current image frame, detect the presence of a positioning mark in the current image frame, and send a trigger signal to the marking control device, and the marking control device is used to determine the marking time of the target pole piece based on the acquisition time of the reference image frame in response to the trigger signal; or, the processing device includes: a communicatively connected image detection device and a marking control device, the image detection device is used to detect the current image frame, detect the presence of a positioning mark in the current image frame, obtain intermediate parameters for determining the marking time of the target pole piece, and send the intermediate parameters to the marking control device, and the marking control device is used to determine the marking time of the target pole piece using the intermediate parameters.

[0043] In the above scheme, the processing device can be flexibly set as an image detection device, or as an image detection device and a marking control device. The image detection device can independently determine the marking time of the target pole piece, or trigger the marking control device to independently determine the marking time of the target pole piece, or cooperate with the marking control device to determine the marking time of the target pole piece to adapt to the needs of different application scenarios.

[0044] In some embodiments, the intermediate parameters include the target distance or the transmission time required for the pole piece coil to move the target distance during the unwinding process. The target distance is the distance between the markable position of the target pole piece and the marking device at the time of acquisition of the reference image frame.

[0045] In the above solution, the image detection device obtains the target distance or transmission time as an intermediate parameter, so that the marking control device can obtain the marking time based on the intermediate parameter, thereby realizing the image detection device and the marking control device collaboratively determining the marking time.

[0046] In some embodiments, there are multiple image acquisition devices, and the multiple image acquisition devices are respectively arranged at different positions for capturing images of different positions on the conveying path of the pole piece coil; at least two of the multiple image acquisition devices serve as target image acquisition devices, and each target image acquisition device is used to capture the pole piece coil in the unwinding process to obtain the current image frame of the target image acquisition device; there are multiple image detection devices, and each image detection device is used to communicate with at least one target image acquisition device, at least for detecting the current image frame of the connected target image acquisition device.

[0047] In the above solution, there may be multiple image detection devices for detecting the current image frame captured by the target image acquisition device to which they are connected, so as to determine the marking time using the image frames captured by each target image acquisition device.

[0048] In some embodiments, the system further includes a marking device, which is communicatively connected to the processing device. The processing device is further configured to send a marking instruction to the marking device at the marking time, and the marking device is configured to mark the target electrode in response to the marking instruction.

[0049] In the above scheme, the pole piece marking system can also be provided with a marking device. After the processing device determines the marking time, it can send a marking instruction to the marking device. The marking device marks the target pole piece in response to the marking instruction, thereby realizing independent marking of the pole piece marked with the positioning mark without relying on the setting action of the positioning mark.

[0050] The present application provides a pole piece marking method, comprising: collecting a pole piece coil in the unwinding process to obtain a current image frame, wherein the pole piece coil includes a plurality of pole piece segments, and the plurality of pole piece segments are distinguished by corresponding positioning marks; detecting the current image frame, and when a positioning mark is detected in the current image frame, determining a marking time of a target pole piece based on a collection time of a reference image frame corresponding to the current image frame, wherein the target pole piece is a pole piece that can be distinguished by the detected positioning mark, the reference image frame is the current image frame or other image frames collected from the pole piece coil, and the marking time is a time when a marking device is triggered to mark the target pole piece.

[0051] In the above scheme, image acquisition is performed on the electrode coil. On the basis of determining that the current image frame acquired contains the positioning mark, the acquisition time of the reference image frame associated with the current image frame is used as a reference to obtain the marking time of the target electrode distinguished by the positioning mark in the current image frame, so as to achieve the independent determination of the marking time of the electrode marked with the positioning mark without relying on the setting action of the positioning mark.

[0052] In some embodiments, determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame includes: obtaining the transmission time required for the pole piece coil to move the target distance during the unwinding process, the target distance being the distance between the markable position of the target pole piece and the marking device at the acquisition time of the reference image frame; determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0053] In the above scheme, the acquisition time of the reference image frame is used as a benchmark reference to determine the time taken for the markable position of the target pole piece to move from the position at the acquisition time of the reference image frame to the marking device, and to determine the marking time of the target pole piece, thereby achieving the ability to determine the marking time of the markable position of the target pole piece without relying on the setting time of the positioning mark, thereby improving the accuracy of the pole piece marking position.

[0054] In some embodiments, determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame includes: taking the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, or, at the acquisition time of the reference image frame, determining the current marking waiting time of the target pole piece as the transmission time.

[0055] In the above scheme, the capture moment and transmission time of the reference image frame can be used to directly determine the exact time point corresponding to the marking moment, or the current moment after waiting for the transmission time can be determined as the marking moment at the capture moment of the reference image frame. It is possible to flexibly choose to directly determine the time point of the marking moment, or determine the current moment after waiting as the marking moment, which can flexibly adapt to different application scenarios.

[0056] In some embodiments, the step of using the sum of the capture time and the transmission time of the reference image frame as the marking time of the target pole piece is performed when a notification signal of the captured image frame can be received and the capture time of the image frame is recorded in response to the notification signal, and the reference image frame is the current image frame.

[0057] In the above scheme, when the acquisition time of the image frame can be recorded, the acquisition time of the recorded reference image frame can be directly used in combination with the transmission time to obtain the exact time point of the marking moment, thereby determining the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0058] In some embodiments, at the capture moment of the reference image frame, the step of determining that the current marking waiting time of the target pole piece is the transmission time is performed when a notification signal of the captured image frame cannot be received, and the reference image frame is other image frames after the current image frame. At the capture moment of the reference image frame, the step of determining that the current marking waiting time of the target pole piece is before the transmission time is also included: monitoring whether the reference image frame has been captured to obtain the capture moment of the reference image frame.

[0059] In the above scheme, when it is impossible to record the acquisition time of the image frame, the acquisition time of the reference image frame can be obtained by monitoring the acquisition of the reference image frame that has not yet been acquired after the current image frame containing the positioning mark, and the time after the waiting time for transmission is determined as the marking time, thereby realizing the determination of the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0060] In some embodiments, obtaining the transmission time required for the electrode coil to move the target distance during the unwinding process includes: determining the target distance using a preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame; and determining the transmission time using the target distance.

[0061] In the above scheme, according to the position of the positioning mark in the current image frame, the position of the positioning mark at the time of acquisition of the current image frame can be associated with the position of the image acquisition device. Combined with the preset distance between the image acquisition device and the marking device, the distance between the positioning mark and the markable position, and the distance of the pole sheet movement between the current image frame and the reference image frame, the target distance between the positioning mark and the marking device at the time of acquisition of the reference image frame can be obtained, and the interval between the reference image frame acquisition time and the marking time can be obtained, so that the interval between the reference value of the reference image frame acquisition time and the marking time can be obtained, so that the marking time can be determined without relying on the setting time of the positioning mark.

[0062] In some embodiments, the step of capturing the pole piece coil in the unwinding process is performed in response to the pulse signal emitted by the encoder to perform image capture, and the target distance is used to determine the transmission time, including: dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; taking the sum of the capture time of the reference image frame and the transmission time as the marking time of the target pole piece, including: recording the pulse number of the encoder each time an image frame is captured to obtain a second pulse number, the second pulse number being the pulse number recorded at the capture time of the reference image frame; determining that the marking of the target pole piece is triggered when the recorded pulse number reaches the sum of the first pulse number and the second pulse number.

[0063] In the above scheme, by setting an encoder that can emit pulses, image acquisition is associated with pulses. The pulse number of the encoder can be used to directly determine the exact time point corresponding to the marking moment. The second pulse number is used to represent the acquisition moment of the reference image frame, and the first pulse number represents the transmission time. The moment when the pulse number is the sum of the first pulse number and the second pulse number is determined as the marking moment, which can trigger marking and improve the accuracy of the marking moment.

[0064] In some embodiments, the step of capturing the pole piece coil in the unwinding process is performed in response to a pulse signal emitted by an encoder to perform image capture, and the target distance is used to determine the transmission time, including: dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; at the capture moment of the reference image frame, determining the current marking waiting time of the target pole piece as the transmission time includes: at the capture moment of the reference image frame, waiting for the encoder to send a pulse signal of the first pulse number before triggering the marking of the target pole piece.

[0065] In the above scheme, by setting an encoder that can emit pulses, image acquisition is associated with pulses, so that based on the number of pulses corresponding to the acquisition moment of the reference image frame, marking is performed after waiting for the pulse signal of the first pulse number, thereby improving the accuracy of the marking time.

[0066] In some embodiments, the current image frame is detected, and when a positioning mark is detected in the current image frame, the step of determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame is performed by the image detection device, or is performed in cooperation with the image detection device and the marking control device.

[0067] In the above scheme, the image detection device can be flexibly set, or the image detection device and the marking control device can be set to determine the marking time of the target electrode based on the acquisition time of the reference image frame corresponding to the current image frame, to meet the needs of different application scenarios.

[0068] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

Brief Description of the Drawings

[0069] The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application.

[0070] FIG1 is a first schematic diagram of a pole piece marking system provided in some embodiments of the present application;

[0071] FIG2 is a second schematic diagram of a pole piece marking system provided in some embodiments of the present application;

[0072] FIG3 is a third schematic diagram of a pole piece marking system provided in some embodiments of the present application;

[0073] FIG4 is a schematic diagram of target distance provided by some embodiments of the present application;

[0074] FIG5 is a schematic diagram of electrical connections of a pole piece marking system provided in some embodiments of the present application;

[0075] FIG6 is a schematic diagram of signal connections of a pole piece marking system provided in some embodiments of the present application;

[0076] FIG7 is another signal connection diagram of the electrode marking system provided in some embodiments of the present application;

[0077] FIG8 is a flow chart of a pole piece marking method provided in some embodiments of the present application. [Specific implementation method]

[0078] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0080] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0081] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0082] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0083] At present, the production process of battery pole pieces includes segmentation and detection and marking of pole piece coils. Among them, the detection of the pole piece can be to detect whether the pole piece has defects, etc., the detection can be performed on the pole piece, and the marking can be used to distinguish pole pieces with different detection results. The segmentation of the pole piece coil can be achieved by setting a positioning mark. Usually, the detection marking is carried out in coordination with the setting action of the positioning mark, and the detection marking can depend on the setting action of the positioning mark, and the two cannot be independent of each other. For example, the pole piece coil that has been set with a positioning mark cannot be independently detected and marked. Therefore, the embodiment of the present application proposes the following method for marking the pole piece coil that has been set with a positioning mark, which can achieve independent marking of the pole piece coil that has been set with a positioning mark without relying on the setting of the positioning mark.

[0084] The electrode marking method provided in this application can be used to mark the electrodes contained in an electrode coil, specifically, to mark the electrodes contained in an electrode coil during the unwinding process. Furthermore, it can be used to mark the electrode coil unwound from a die-slitting and slitting machine. The marked electrode coil can be used as a battery electrode.

[0085] Please refer to FIG1 , which is a first schematic diagram of a pole piece marking system provided in some embodiments of the present application.

[0086] As shown in the figure, the pole piece marking system 10 may include an image acquisition device 11 and a processing device 12 .

[0087] The image acquisition device 11 is used to capture the electrode coil in the unwinding process to obtain the current image frame.

[0088] In a specific application scenario, the image acquisition device 11 can capture an image of a partial area of ​​the electrode roll at a certain interval to capture different positions of the electrode roll that moves due to unwinding. The image captured at the current moment can be called the current image frame.

[0089] The electrode coil includes several sections of electrode, which can be distinguished by corresponding positioning marks. Specifically, each section of electrode can be associated with a positioning mark, and the associated electrode can be distinguished according to the positioning marks on the electrode coil.

[0090] The processing device 12 is communicatively connected to the image acquisition device 11 and is used to detect the current image frame. When a positioning mark is detected in the current image frame, the marking time of the target electrode is determined based on the acquisition time of the reference image frame corresponding to the current image frame.

[0091] The target pole piece is a pole piece that can be distinguished by a positioning mark detected in the current image frame.

[0092] Specifically, the current image frame may be detected for a positioning mark to detect whether the current image frame has a positioning mark. When the positioning mark is detected in the current image frame, the corresponding electrode on the electrode coil may be identified, which may be referred to as a target electrode.

[0093] For example, the length of each pole piece can be fixed at L0, and the positioning mark can also be set at the center of the length of each pole piece, that is, at the length L0 / 2, so that the associated pole pieces can be distinguished based on the positioning mark. In a specific application scenario, the positioning mark is a mark at the center of the length, and the range of L0 / 2 to the left and right of the positioning mark can be the target pole piece.

[0094] The marking time of the target electrode can be determined based on the acquisition time of the reference image frame corresponding to the current image frame. The reference image frame can be the current image frame, or it can be another image frame acquired from the electrode coil. The acquisition time of the reference image frame is the time when the image acquisition device 11 acquires the reference image frame. The marking time is the time when the marking device is triggered to mark the target electrode.

[0095] In some embodiments, the other image frames may be image frames acquired after the current image frame is acquired. In some embodiments, the other image frames may also be image frames acquired before the current image frame is acquired. The specific setting can be based on actual application needs.

[0096] The acquisition time of the reference image frame corresponding to the current image frame is used as a reference for marking the target pole piece associated with the positioning mark in the current image frame, and the marking time of the target pole piece is determined based on the reference.

[0097] In the above scheme, the electrode marking system can capture images of the electrode coil, and on the basis of determining that the current image frame obtained by the capture contains the positioning mark, use the capture time of the reference image frame associated with the current image frame as a reference to obtain the marking time of the target electrode distinguished by the positioning mark in the current image frame, so as to realize the independent determination of the marking time of the electrode marked with the positioning mark without relying on the setting action of the positioning mark.

[0098] The above method can be applied to electrode coils that have been marked with positioning marks but have missed detection and marking. It does not rely on the setting action of the positioning marks but relies on visual inspection to achieve re-inspection and marking of the electrode coils. The electrode coils that have completed re-inspection and marking can enter the subsequent process. Compared with directly discarding the electrode coils that have been marked with positioning marks but missed detection and marking, it reduces waste and reduces costs.

[0099] In some embodiments, the positioning mark may be a dividing mark for dividing two adjacent electrode pieces, that is, one side of the positioning mark is one electrode piece, and the other side of the positioning mark is another electrode piece.

[0100] Of course, the positioning mark is not limited to the segmentation mark in the previous example and can be set according to actual application needs.

[0101] Exemplarily, the positioning mark is a segmentation mark, and the pole piece before the segmentation mark can be used as the target pole piece, or the pole piece after the segmentation mark can be used as the target pole piece.

[0102] In some embodiments, the marking time can be used to trigger the marking device to perform marking at the marking time. Specifically, the processing device 12 can send a marking signal to the marking device to trigger the marking device to operate.

[0103] Furthermore, the processing device is used to determine the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame, including: obtaining the transmission time required for the pole piece coil to move the target distance during the unwinding process, the target distance being the distance between the markable position of the target pole piece and the marking device at the acquisition time of the reference image frame; determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0104] The target distance may be the distance between the markable position of the target electrode and the marking device at the time of acquisition of the reference image frame.

[0105] In a specific application scenario, the marking device can be set in the motion path of the unwinding of the electrode coil, and the marking device can realize marking on the unwound electrode coil by inkjet or other methods. As the electrode coil is unwound, the markable position of the target electrode moves to the working position of the marking device (the position where the mark is made), and the marking device performs marking, which can realize marking at the markable position of the target electrode. The target distance can be the distance between the markable position of the target electrode and the working position of the target device at the time of acquisition of the reference image frame. For the sake of ease of understanding and simplified expression, it can be referred to as the distance between the markable position of the target electrode and the marking device.

[0106] Wherein, the markable position of the target pole piece is located within the range of the target pole piece. Further, the markable position can be a certain area within the target pole piece, and the markable position can be determined by limiting it in the length direction of the pole piece. Exemplarily, the markable position can be set to a preset length range from a starting position in the length direction of the target pole piece. Alternatively, the markable position can be a fixed position within the target pole piece, and exemplarily, the markable position can be set to a preset distance from a starting position in the length direction of the target pole piece.

[0107] In a specific application scenario, the positioning mark can also be used as a reference for the markable position, and the position at a preset distance from the positioning mark of the target electrode in the longitudinal direction can be used as the markable position. The positioning mark can be a segmentation mark or is not limited to a segmentation mark.

[0108] At the time the reference image frame is captured, the distance between the target electrode and the marking device is the target distance. As the electrode coil moves, the target electrode moves toward the marking device. From the capture time, after the transfer time, the target electrode's markable position moves to the marking device, allowing marking to be performed at the markable position. Therefore, after determining the transfer time and the capture time of the reference image frame, the marking time of the target electrode can be determined.

[0109] It should be noted that the marking time is affected by the markable position. If the markable position is within a certain range, the transmission time can be a range of time corresponding to the start and end positions of the markable position, and the marking time can be any time within the certain time range. If the markable position is a fixed position, the transmission time can be a fixed time, and the marking time can also be a fixed time.

[0110] By using the capture time of the reference image frame as a reference, the time required for the target electrode's markable position to move from the reference image frame's capture time to the marking device is determined, and the marking time of the target electrode is determined. This allows the marking time of the target electrode's markable position to be determined independently of the time when the positioning mark is set, thereby improving the accuracy of the electrode marking position. The markable position can be set according to actual needs and can be a certain range or a fixed position, which can adapt to various needs.

[0111] In some embodiments, the processing device 12 may add the transmission time to the capture time of the reference image frame and use the resulting time as the marking time of the target electrode. Alternatively, the processing device 12 may use the determined transmission time as the current marking waiting time of the target electrode at the capture time of the reference image frame, i.e., trigger the marking device to mark after waiting for the current marking waiting time from the capture time of the reference image frame.

[0112] In some embodiments, the image acquisition device 11 is further used to send a notification signal to the processing device 12 in response to capturing an image frame. The processing device 12 is further used to receive the notification signal that the image acquisition device has captured an image frame, and record the capture time of the image frame in response to the notification signal to obtain the capture time of the reference image frame.

[0113] In the above manner, the image acquisition device 11 sends a notification signal each time it acquires an image frame. The processing device 12 can record the acquisition time of each image frame in response to the received notification signal, thereby obtaining the acquisition time of the reference image frame.

[0114] Therefore, the capture time of any image frame can be recorded, and any image frame can be selected as the reference image frame. Furthermore, the current image frame can be selected as the reference image frame. After recording the capture time of the reference image frame, the reference image frame can be used as a reference to determine the marking time.

[0115] In some embodiments, the processing device may use the current image frame as a reference image frame, record the acquisition time of the reference image frame, and then use the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target electrode. Of course, other methods can also be used, and examples are not given here one by one.

[0116] It should be noted that the method of using the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target electrode is carried out under the condition that the acquisition time of the image frame can be recorded.

[0117] In some embodiments, when the capture time of the image frame can be recorded, the determined transmission time at the capture time of the reference image frame can be used as the current marking waiting time of the target electrode to trigger the marking device to mark.

[0118] Please refer to FIG. 2 , which is a second schematic diagram of a pole piece marking system provided in some embodiments of the present application.

[0119] In conjunction with the description of the aforementioned embodiments, the image acquisition device 11 can capture external images for capturing images of the electrode coil during the unwinding process. Specifically, it can include a camera 111 and an acquisition card 112. The camera 111 is used to capture images of the electrode coil during the unwinding process to obtain image frames, including a current image frame and a reference image frame. For example, the camera 111 can be a line scan camera, etc.

[0120] The acquisition card 112 is communicatively connected to the camera 111 and the processing device 12 respectively. The acquisition card 112 is used to send a notification signal to the processing device 12 in response to the acquisition of the image frame, and send the image frame to the processing device 12 so that the processing device 12 detects the current image frame.

[0121] The acquisition card 112 is configured to communicate with the camera 111 and the processing device 12. When an image frame is acquired, it can send a notification signal to the processing device 12. In response to the notification signal, the processing device 12 can record the acquisition time of each image frame to obtain the marking time. This allows the marking time of the target electrode to be determined independently of the setting time of the positioning mark.

[0122] Please continue to refer to Figure 2, which also shows that in some embodiments, the electrode marking system 10 can also include an encoder 13, which is respectively connected to the processing device 12 and the image acquisition device 11 for sending pulse signals to the processing device 12 and the image acquisition device 11.

[0123] The image acquisition device 11 can perform image acquisition in response to a pulse signal, and the processing device 12 can record the acquisition time of the image frame in response to a notification signal, including: recording the number of pulses emitted by the encoder 13 at the acquisition time of the image frame in response to the notification signal.

[0124] Therefore, by setting an encoder 13 that can emit pulses to trigger image acquisition and serve as a reference for the recording time, the number of pulses of the encoder 13 can be used to characterize the acquisition time of the image frame, and the acquisition time of the image frame can be accurately recorded to determine the marking time of the target pole piece, thereby improving the accuracy of the marking time.

[0125] It can be understood that the pulse signal of the encoder 13 can be associated with the unwinding of the pole piece coil.

[0126] It is understandable that the capture time of the image frame may also be recorded in other ways, which may be set specifically according to actual application needs, and will not be illustrated one by one here.

[0127] In some embodiments, the processing device 12 may also be configured to monitor whether a reference image frame has been captured, upon detecting the presence of a positioning mark in the current image frame, to obtain the capture time of the reference image frame. The reference image frame may be an image frame subsequent to the current image frame. The reference image frame obtained in this manner may be used to determine the marking time of the target electrode.

[0128] In a specific application scenario, the acquisition time of the reference image frame is used as the starting time of the current marking waiting time of the target pole piece to obtain the marking time of the target pole piece.

[0129] Furthermore, the method of using the transmission time as the current marking waiting time of the target electrode at the capture time of the reference image frame can be performed when the capture time of the image frame cannot be recorded through the notification signal of the image capture device 11.

[0130] It is understood that since the capture time of the current image frame cannot be recorded via the notification signal from the image capture device 11, the capture time of the current image frame cannot be determined, and thus it cannot be used as a reference image frame. Instead, an image subsequent to the current image frame that has not yet been captured can be used as a reference image frame. After determining the presence of a positioning marker in the current image frame, the capture time of the reference image frame can be obtained as a reference for the positioning time. The processing device 12 can also monitor whether the reference image frame has been captured to obtain the capture time of the reference image frame.

[0131] In a specific application scenario, the processing device 12 is in communication with the image acquisition device 11, and the processing device 12 can obtain the image frame acquired by the image acquisition device 11. When a positioning marker is detected in the current image frame, the next image frame of the current image frame can be used as a reference image frame, and the processing device 12 can be used to monitor the acquisition of the next image frame of the current image frame to obtain the acquisition time of the reference image frame.

[0132] In the above manner, whether the processing device 12 is able to record the acquisition time of the image frame or not, it is possible to determine the marking time of the target electrode independently of the setting time of the positioning mark.

[0133] Furthermore, the processing device 12 is used to obtain the transmission time required for the electrode coil to move the target distance during the unwinding process, including: using the preset distance between the image acquisition device 11 and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame to determine the target distance; using the target distance, determine the transmission time.

[0134] Among them, the image acquisition device 11 and the marking device are both arranged on the path of the electrode coil unwinding, and the distance between the two is a preset distance and can be adjusted according to actual needs. The current image frame is detected with respect to the positioning mark, and the position of the positioning mark in the current image frame can also be obtained. The distance between the positioning mark and the markable position can be preset according to actual needs. Since the length of the electrode coil captured by the image frame can be a preset length, the distance between the current image frame and the reference image frame represents the distance the electrode coil moves during the time interval between the current image frame and the reference image frame, which can be determined based on the length of the electrode coil that can be captured by a single image frame and the number of image frames in between.

[0135] In a specific application scenario, the positioning mark can be a segmentation mark. The position before the segmentation mark belongs to the target electrode, and the position after the segmentation mark belongs to the next segment of the electrode. The markable position can be a position a certain distance before the segmentation mark.

[0136] In a specific application scenario, the reference image frame may be an image following the current image frame, and the distance between the reference image frame and the current image frame may be an image representing the length of the pole piece.

[0137] It should be noted that the aforementioned distance and position may represent the distance in the direction of movement of the pole piece coil, that is, the distance in the length direction of the pole piece.

[0138] It should be noted that the image acquisition device 11 acquires a current image frame from the electrode coil. The current image frame is a partial image of the electrode coil, which may include an image of the working position of the image acquisition device 11. The positioning mark can be associated with the working position of the image acquisition device 11 based on its position in the current image frame. For ease of understanding and simplified description, the working position of the image acquisition device 11 is referred to as the position of the image acquisition device.

[0139] In a specific application scenario, when the reference image frame is the current image frame, the position of the positioning mark in the current image frame can be used to determine the distance between the positioning mark and the position of the image acquisition device 11. Combined with the distance between the positioning mark and the markable position and the preset distance between the image acquisition device 11 and the marking device, the distance between the markable position and the marking device at the capture moment of the current image frame can be determined, which can be used as the target distance.

[0140] In a specific application scenario, when the reference image frame is not the current image frame, the position of the positioning mark in the current image frame can be used to determine the distance between the positioning mark and the position of the image acquisition device 11, and combined with the distance between the positioning mark and the markable position and the preset distance between the image acquisition device 11 and the marking device, the distance between the markable position and the marking device at the capture moment of the current image frame can be determined. On this basis, combined with the distance between the current image frame and the reference image frame, the target distance can be obtained.

[0141] Specifically, the target distance is the distance between the markable position of the target electrode and the marking device at the time of capturing the reference image frame. The transmission time can be determined based on the target distance and the speed of the electrode coil during the unwinding process.

[0142] Furthermore, the image acquisition device 11 may perform image acquisition in response to a pulse signal emitted by the encoder 13. The processing device 12 determining the transmission time may include: dividing the target distance by the single pulse accuracy of the encoder 13 to obtain a first pulse number used to characterize the transmission time. The processing device 12 is configured to use the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, including: recording the pulse number of the encoder 13 each time the image acquisition device 11 captures an image frame to obtain a second pulse number, the second pulse number being the pulse number recorded at the acquisition time of the reference image frame; determining the marking time as the time when the recorded pulse number reaches the sum of the first pulse number and the second pulse number, and triggering the marking of the target pole piece at the marking time.

[0143] In a specific application scenario, the target distance is represented by D, and the first pulse number representing the transmission time can be Nb=D / P2. The single pulse accuracy of the encoder 13 is P2 (unit: mm).

[0144] In some embodiments, the time required for the electrode web to move a reference distance can be determined first, and then combined with the duration of the interval between the capture time of the current image frame and the capture time of the reference image frame to obtain the transmission time. The reference distance is the distance between the markable position of the target electrode and the marking device at the capture time of the current image frame. Since the interval between the capture times of two adjacent image frames can be a preset value, the interval duration can be obtained based on the preset time interval.

[0145] In one implementation scenario, the time required for the electrode coil to move the target distance during the unwinding process can be expressed as the first pulse number.

[0146] In some embodiments, the processing device 12 is used to determine the current marking waiting time of the target pole piece as the transmission time at the capture moment of the reference image frame, which may include: starting from the capture moment of the reference image frame, waiting for the encoder 13 to send a pulse signal with a first number of pulses before triggering the marking of the target pole piece.

[0147] In some embodiments, the processing device 12 may record the number of pulses of the encoder each time the image acquisition device 11 captures an image frame. The processing device 12 using the sum of the capture time of the reference image frame and the transmission time as the marking time for the target pole piece may include obtaining a second pulse number and determining that marking of the target pole piece is triggered when the recorded pulse number reaches the sum of the first pulse number and the second pulse number. The second pulse number is the pulse number recorded by the pulse recording device at the time the image acquisition device 11 captures the reference image frame.

[0148] Please refer to FIG3 , which is a third schematic diagram of a pole piece marking system provided in some embodiments of the present application.

[0149] The electrode marking system 10 may include multiple image acquisition devices 11 , which are respectively arranged at different positions for acquiring images at different positions on the transmission path of the electrode coil.

[0150] At least two of the multiple image acquisition devices 11 serve as target image acquisition devices 11 a , and each target image acquisition device 11 a is used to capture the pole piece coil in the unwinding process to obtain a current image frame of the target image acquisition device 11 a ;

[0151] The processing device 12 can also be used to respond to the determination of the marking time of the target pole piece corresponding to a target image acquisition device 11a and update the marking time of the target pole piece using the latest determined marking time of the target pole piece corresponding to the target image acquisition device 11a.

[0152] In some embodiments, the electrode sheet coil is further stripped during the unwinding process, and the target image acquisition device 11a includes a first target image acquisition device 11aa provided before the electrode sheet coil is stripped and a second target image acquisition device 11ab provided after the electrode sheet coil is stripped.

[0153] As shown in FIG3 , there are four sets of image acquisition devices 11. The captured image frames can be used for positioning mark detection and / or defect detection. These include a first target image acquisition device 11aa, two sets of second target image acquisition devices 11ab, and a non-target image acquisition device 11b positioned before the striping. Depending on their placement, the non-target image acquisition device 11b can also be referred to as a light-directed camera, the first target image acquisition device 11aa can also be referred to as a backlight camera, and the two sets of second target image acquisition devices 11ab can also be referred to as a striping camera. The images captured by one or more of these devices can be used for defect detection, and can be used to determine whether a pole piece has defects from one or more angles.

[0154] In some embodiments, the electrode marking system 10 is used to mark the electrode coil on the die-cutting and slitting machine 20. The die-cutting and slitting machine 20 may include an unwinding device (not shown in the figure), a rewinding device 21 and a mark setting device 22, wherein the unwinding device and the rewinding device 21 are used to unwind and rewind the electrode coil, and the mark setting device 22 is used to set a positioning mark on the electrode. The die-cutting and slitting machine 20 may also include a slitting device (not shown in the figure), which is arranged between the unwinding device and the rewinding device 21, and is used to cut the unwound electrode coil along the length direction during the unwinding process to obtain at least two sub-electrode coils.

[0155] In some cases, the die-cutting and slitting machine further includes a plurality of rollers, which are arranged between the unwinding device and the rewinding device 21 for conveying the electrode coil.

[0156] The electrode coil is unwound by the unwinding device of the die-cutting and slitting machine 20, and the electrode coil is provided with a positioning mark before unwinding. During the unwinding process of the electrode coil, the mark setting device 22 for setting the positioning mark in the die-cutting and slitting machine 20 does not work.

[0157] The number of winding devices 21 included in the die-cutting and slitting machine 20 can be consistent with the number of slit sub-electrode sheet coils, so that each sub-electrode sheet coil can be wound up separately using the winding device 21, thereby obtaining at least two rolls of sub-electrode sheet coils. The target image acquisition device 11a can be set before the stripping, or after the stripping, or partially before the stripping and partially after the stripping. Among them, the number of second target image acquisition devices 11ab provided after the stripping of the electrode sheet coil can be consistent with the number of sub-electrode sheet coils.

[0158] In a specific application scenario, the unwinding device is used to unwind the electrode coil that has been provided with positioning marks, the image acquisition device 11 is used to capture the electrode during the unwinding process, and the winding device 21 is used to rewind the electrode coil.

[0159] In some embodiments, the electrode marking system 10 further includes a marking device 14 for marking the electrode coil. If the electrode coil is stripped during unwinding, the number of marking devices 14 may be the same as the number of sub-electrode coils obtained by stripping.

[0160] In some embodiments, the images captured by the multiple image acquisition devices 11 can also be used for defect detection.

[0161] In a specific application scenario, the marking setting device 22 may be a laser.

[0162] Of course, the electrode marking system 10 provided in the present application may not be limited to being applied to the electrode coils unwound from the aforementioned die-cutting and slitting machine 20, but may also be applied to other electrode coils in the unwinding process.

[0163] As shown in FIG3 , after the electrode sheet coil is cut by the slitting device, it is divided into a first sub-electrode sheet coil and a second sub-electrode sheet coil. The first sub-electrode sheet coil and the second sub-electrode sheet coil are rewound by the first rewinding device 21 a and the second rewinding device 21 b respectively. The first marking device 14 a and the second marking device 14 b are respectively marked.

[0164] In a specific application scenario, a laser is used to cut a mark hole at a certain interval on the electrode coil. The length of the electrode between two mark holes on the electrode coil is the length of one battery cell electrode. When the laser cuts the mark hole, the time at which the mark hole is cut can be recorded. Since the distance from the laser to the labeling machine is fixed, the time for the mark hole to move between the two is also fixed. Therefore, the marking machine can be controlled based on the time when the mark hole is cut.

[0165] The electrode marking system 10 provided in this application can be independent of the time of laser cutting, but can be marked based on visual inspection. For example, the electrode coil can be provided with no mark hole, and after laser drilling, the electrode coil is provided with a positioning mark, that is, the marking time can be determined by visual inspection. For another example, the electrode coil can be provided with a mark hole, and the marking time can be determined by visual inspection.

[0166] In a specific application scenario, after the electrode coil undergoes the die-cutting inspection process, during the winding process, the electrode is wrinkled due to misalignment, or the film roll is wound into a barrel, or the marking machine limit switch is broken, the marking machine crushes the electrode, the electrode has flowed out of the visual inspection range, etc., and the electrode is defective but not marked. After the electrode flows to the winding station, it is found that the electrode is not marked in batches, resulting in all the electrodes produced in this stage being frozen. At this time, the electrode coil can be rewound and rewound, and visual inspection is used to re-mark it in this process. Compared with the prior art, for frozen electrodes, the electrode marking method provided by the present application can be used to mark electrode coils that have been set with positioning marks. For example, frozen electrodes can be reused by re-marking, reducing electrode waste.

[0167] Please refer to FIG4 , which is a schematic diagram of target distance provided in some embodiments of the present application.

[0168] As shown in the figure, direction A in Figure 4 is the feeding direction of the electrode coil, which can represent the direction of movement of the electrode coil. A laser b, a backlight camera c, a slitting camera d, and a marking device e are set on the movement path of the electrode coil.

[0169] The figure also shows the images captured of the electrode coil, from the first image 1 to the fifth image 5. The image capture order is from the first image 1 to the fifth image 5, as measured along the tape run. For example, the fourth image 4 at the backlight camera c is the current image frame, and a positioning mark f is included on the fourth image 4. Positioning mark f can be a segmentation mark, specifically a mark hole. The current electrode is located before the mark hole, and the next electrode is located after the mark hole. The current image frame includes the mark hole.

[0170] Here, the backlight camera c is used as the image acquisition device 11 as an example. The distance between the backlight camera c and the marking device e can be expressed as L1, the length of the image frame can be expressed as L0, the distance between the mark hole and the edge of the current image frame closest to the front in the tape running direction can be expressed as X1, and the edge of the current image frame closest to the rear in the tape running direction can be considered to be aligned with the position of the backlight camera c.

[0171] When capturing the current image frame, the distance between the Mark hole and the marking device e can be expressed as L1-(L0-X1). For example, the distance L between the markable position and the Mark hole is used for illustration. The reference distance between the markable position and the marking device e can be expressed as D=L1-(L0-X1)-L.

[0172] If the current image frame is used as the reference image frame, then L1-(L0-X1)-L can be used as the target distance, and the time it takes for the pole piece coil to move the target distance L1-(L0-X1)-L is the transmission time.

[0173] If other image frames are used as reference image frames, the target distance can be determined based on the benchmark distance and the distance between the reference image frame and the current image frame, and then the transmission time of the pole piece coil moving the target distance can be determined.

[0174] For example, the image frame following the current image frame can be selected as the reference image frame. For example, if the second image 2 in the figure is the current image frame, the third image 3 is the reference image frame. By selecting the image frame following the current image frame as the reference image frame, the target distance can be expressed as L1-L0-(L0-X1)-L.

[0175] In some embodiments, a striping camera d can also be used as the image acquisition device 11. The distance between the striping camera d and the marking device e can be expressed as L2. For example, the distance between the mark hole and the edge closest to the front in the tape running direction in the current image frame captured by the striping camera d is X2. Then, the reference distance D = L2 - (L0 - X2) - L can be obtained to calculate the transmission time.

[0176] In some embodiments, when both the backlight camera c and the strip camera d are used as the image acquisition device 11, the backlight camera c and the strip camera d can be used as the target image acquisition device 11a, and the image frames containing the same positioning mark f acquired by the two cameras can be used as the current image frames. The two cameras can perform the process from obtaining the current image frame to triggering the determination of the marking time of the target pole piece. The marking time of the target pole piece corresponding to the backlight camera c and the marking time of the target pole piece corresponding to the strip camera d can then be combined to obtain the final marking time of the target pole piece. For example, since the strip camera d is located at a rear position in the tape transport direction, the marking time determined by the strip camera d can be used to update the marking time of the target pole piece.

[0177] It should be noted that, in the two image frames captured by the backlight camera c and the striping camera d and containing the same positioning mark f, the positions of the positioning mark f may be different, such as X1 and X2 in the previous example.

[0178] It is understandable that marking the electrode can be marking defects on the electrode, and of course it can also be marking other aspects of the electrode, for example, size marking, etc. The mark can indicate the properties of the electrode, such as a defect mark can indicate that the electrode has a defect, and the defective electrode can be excluded from use.

[0179] In some embodiments, in addition to determining the marking time of the target electrode, the electrode marking method may also include determining whether the target electrode needs to be marked. These two parts can be independent of each other, and the execution order of the two parts can have no dependency relationship. Of course, the execution of the two parts can also be set according to their coordination relationship. The marking of the target electrode can be determined by combining these two parts, with the former determining the marking time and the latter determining whether to mark.

[0180] For example, each section of the electrode coil can be marked by default, and the marking time of the target electrode can include the marking time of each section of the electrode on the electrode coil. Depending on whether marking is required, it can be determined whether the marking of each section of the electrode needs to be retained or cancelled.

[0181] For example, it may be set as a default that the pole pieces of the pole piece coil are not to be marked, and it may be determined whether each section of the pole piece on the pole piece coil needs to be marked, and for the pole pieces that need to be marked, the marking time may be determined.

[0182] The following description will be given using defect marking as an example. The same applies to other markings. The processing device 12 can also be used to find several image frames that at least contain part of the target pole piece from the multiple image frames acquired by the image acquisition device 11 for the pole piece coil; use the several image frames that at least contain part of the target pole piece to perform defect detection on the target pole piece to obtain the defect detection result of the target pole piece; based on the defect detection result of the target pole piece, determine whether to trigger the marking device to mark the target pole piece.

[0183] Among them, if the default setting is to mark each electrode section of the electrode coil, then the processing device 12 can cancel sending the marking signal of the target electrode section to the marking device in response to the defect detection result indicating that the target electrode section has no defects, and the marking signal is used to instruct the marking device to mark the target electrode section as having defects; in response to the defect detection result indicating that the target electrode section has defects, retain sending the marking signal of the target electrode section to the marking device.

[0184] It is understood that, taking the image frames captured by the same image acquisition device 11 as an example, the target pole piece may appear in one or more of the multiple image frames captured by the same image acquisition device 11. For example, one image may include an image of the entire target pole piece, or one image may include an image of a portion of the target pole piece, and another image may include an image of the remaining portion of the target pole piece, and the two images may be combined to obtain an image of the entire target pole piece.

[0185] Defect detection can be used to determine whether a defect exists. The defect detection result of a target electrode can indicate whether the target electrode has a defect. Defects can take many forms, such as, for example, an unclean electrode surface or wrinkled electrode. Examples are not provided here.

[0186] In some embodiments, the processing device 12 can splice several image frames that contain at least part of the target pole piece to obtain an image to be detected that contains a complete target pole piece, perform defect detection on the target pole piece contained in the image to be detected, and obtain a defect detection result of the target pole piece.

[0187] In some embodiments, the processing device 12 can perform defect detection on each image frame acquired by the same image acquisition device 11, distinguish each pole piece according to the positioning mark f, merge the detection results within the target pole piece range, and obtain the defect detection result of the target pole piece.

[0188] In a specific application scenario, the positioning marker f can be a segmentation marker. This is illustrated using the segmentation marker between the target electrode and the segment following it as an example. If an image frame contains the segmentation marker between the target electrode and the segment following it, defects before the segmentation marker in that image frame belong to the target electrode, and defects after the segmentation marker belong to the segment following it. The segmentation marker can be used to determine the range of the target electrode. By merging the detection results within the target electrode range in each image frame, a defect detection result for the target electrode can be obtained.

[0189] In the above scheme, by detecting the defects of the image frame containing the target electrode, it is determined whether to trigger the marking device to mark the target electrode according to whether the target electrode contains defects. This can distinguish between normal electrodes and defective electrodes for reference in subsequent processing, thereby reducing the impact of defective electrodes.

[0190] Please refer to FIG5 , which is a schematic diagram of electrical connections of a pole piece marking system provided in some embodiments of the present application.

[0191] The processing device 12 may include an image detection device 121, or may include an image detection device 121 and a marking control device 122. The latter is used as an example in the figure for description.

[0192] When the processing device 12 includes an image detection device 121 but does not include a marking control device 122, the image detection device 121 is used to detect the current image frame, and when a positioning mark is detected in the current image frame, the marking time of the target pole piece is determined based on the acquisition time of the reference image frame corresponding to the current image frame.

[0193] After obtaining the marking time, the image detection device 121 can send a marking signal of the target electrode to the marking device, so that the marking device performs marking at the marking time, thereby marking the markable position of the target electrode.

[0194] In the case where the processing device 12 includes an image detection device 121 and a marking control device 122, the image detection device 121 and the marking control device 122 can be communicatively connected. In some embodiments, the image detection device 121 is used to detect the current image frame, detect the presence of a positioning mark in the current image frame, and send a trigger signal to the marking control device 122. The marking control device 122 is used to determine the marking time of the target pole piece based on the acquisition time of the reference image frame in response to the trigger signal. In some embodiments, the image detection device 121 is used to detect the current image frame, detect the presence of a positioning mark in the current image frame, obtain intermediate parameters for determining the marking time of the target pole piece, and send the intermediate parameters to the marking control device 122. The marking control device 122 is used to determine the marking time of the target pole piece using the intermediate parameters.

[0195] After obtaining the marking time, the marking control device 122 may send a marking signal of the target electrode to the marking device, so that the marking device performs marking at the marking time, thereby marking the markable position of the target electrode.

[0196] The determination of the marking time of the target electrode can be accomplished collaboratively by the image detection device 121 and the marking control device 122. Intermediate parameters are parameters that can be used to determine the marking time. Furthermore, the intermediate parameters include the target distance or the time required for the electrode coil to move the target distance during the unwinding process. The target distance is the distance between the markable position of the target electrode and the marking device at the time the reference image frame is captured.

[0197] In one implementation scenario, the intermediate parameters may include the target distance or the transmission time required for the electrode coil to move the target distance during the unwinding process, wherein the target distance is the distance between the markable position of the target electrode and the marking device at the time of acquisition of the reference image frame.

[0198] Of course, the intermediate parameters may not be limited to the target distance and transmission time mentioned above. The intermediate parameters may be any parameters that can be used to obtain the marking time. For example, the intermediate parameters may also include a reference distance. The reference distance is the distance between the markable position of the target electrode and the marking device at the acquisition time of the current image frame. Since the distance between the current image frame and the reference image frame can be preset, the marking control device 122 can also obtain the marking time by using the reference distance in combination with the distance between the current image frame and the reference image frame. For example, the intermediate parameters may include the time it takes for the electrode coil to move the reference distance. Since the interval between the acquisition times of the image frames can be preset, the marking control device 122 can also obtain the marking time by using the time it takes for the electrode coil to move the reference distance in combination with the preset time interval.

[0199] It is understood that the aforementioned target distance, transport time, reference distance, and time taken to travel the electrode coil reference distance can all be independently used to determine the marking time. The intermediate parameters can also include multiple parameters that can be independently used to determine the marking time. The marking control device 122 can then determine the final marking time by combining the marking times obtained based on each parameter.

[0200] The image acquisition device 11 may include a camera 111 and an acquisition card 112 .

[0201] In some embodiments, there are multiple image acquisition devices 11, each located at different positions, for capturing images at different positions along the electrode sheet conveying path. At least two of the multiple image acquisition devices 11 serve as target image acquisition devices 11a, each of which is configured to capture images of the electrode sheet during the unwinding process to obtain a current image frame for the target image acquisition device 11a. The acquisition cards 112 of at least some of the image acquisition devices 11 can also communicate with each other.

[0202] Accordingly, there are multiple image detection devices 121, and each image detection device 121 is used to communicate with at least one target image acquisition device 11a, and is at least used to detect the current image frame of the connected target image acquisition device 11a.

[0203] As shown in Figure 5, a non-target image acquisition device 11b, a first target image acquisition device 11aa, and two sets of second target image acquisition devices 11ab are provided. A first image detection device 121a and a second image detection device 121b are also provided. The non-target image acquisition device 11b and the first target image acquisition device 11aa are communicatively connected to the first image detection device 121a, and are configured to detect the current image frame captured by the connected first target image acquisition device 11aa. The second image detection device 121b is communicatively connected to the two sets of second target image acquisition devices 11ab, and is configured to detect the current image frames captured by the two connected sets of second target image acquisition devices 11ab.

[0204] In some embodiments, the electrode marking system 10 further includes a marking device 14, which is communicatively connected to the processing device 12 and is configured to mark the electrode coil. Specifically, the processing device 12 is further configured to send a marking instruction to the marking device 14 at the marking time, and the marking device 14 is configured to mark the target electrode in response to the marking instruction. Furthermore, the marking device 14 may be communicatively connected to a marking control device 122.

[0205] The figure also shows that the electrode marking system 10 also includes an encoder 13 and a signal distributor 15. The encoder 13 is connected to the signal distributor 15, and the signal distributor 15 is connected to each image acquisition device 11 and the processing device 12 respectively. The encoder 13 is used to emit a pulse signal, and the signal distributor 15 distributes the pulse signal emitted by the encoder 13 to each receiving device. Exemplarily, the signal distributor 15 distributes the pulse signal emitted by the encoder 13 to each image acquisition device 11 to trigger image acquisition. The signal distributor 15 distributes the pulse signal emitted by the encoder 13 to the processing device 12 for determining the current pulse signal.

[0206] The pulse signal sent by the encoder 13 may be associated with the unwinding movement of the pole piece coil.

[0207] Furthermore, the signal distributor 15 may be connected to the acquisition card 112 in each image acquisition device 11. The signal distributor 15 may be connected to the marking control device 122.

[0208] In a specific application scenario, the marking control device 122 may be a programmable logic controller (PLC). The image detection device 121 may be an industrial control computer. When there are multiple groups of image detection devices 121, a master industrial computer and slave industrial computers may be provided. The marking device 14 may be a marking machine capable of marking using inkjet or other methods.

[0209] In some embodiments, the electrode marking system 10 may further include a switch 16 , which is respectively connected to the multiple groups of image detection devices 121 and the marking control device 122 when there are multiple groups of image detection devices 121 .

[0210] Please refer to FIG6 , which is a signal connection diagram of a pole piece marking system provided in some embodiments of the present application.

[0211] The encoder 13 of the electrode marking system 10 is connected to a signal distributor 15, which is connected to each image acquisition device 11 to distribute signals to each image acquisition device 11. The figure shows a total of X image acquisition devices 11, each of which includes an acquisition card 112 and a camera 111. Specifically, the signal distributor 15 can be connected to each acquisition card 112. The target image acquisition device 11a can be communicatively connected to a marking control device 122.

[0212] Specifically, the acquisition card 112 and the marking control device 122 can be communicatively connected, so that the image acquisition device 11 can send a notification signal and the processing device 12 can record the acquisition time of the image frame to obtain the acquisition time of the reference image frame.

[0213] In one implementation scenario, the camera 111 captures the current image frame, the capture card 112 outputs a notification signal to the marking control device 122, and the marking control device 122 records the number of pulses at this time in response to the notification signal to indicate the capture time of the captured image frame.

[0214] In a specific application scenario, the marking control device 122 is a PLC, which can record the real-time pulse signal of the encoder 13, recorded as Nt. After the camera 111 captures the current image frame, the acquisition card 112 outputs the picture frame signal and outputs it to the PLC frame signal. The PLC records the number of pulses N at this time.

[0215] The above-mentioned manner enables the processing device 12 to receive the notification signal that the image acquisition device 11 has acquired an image frame, and to record the acquisition time of the image frame in response to the notification signal to obtain the acquisition time of the reference image frame.

[0216] Please refer to FIG. 7 , which is another signal connection diagram of the electrode marking system provided in some embodiments of the present application.

[0217] Unlike the embodiment shown in FIG6 , the target image acquisition device 11a cannot communicate with the marking control device 122, and therefore cannot record the capture time of the image frame using the notification signal from the image acquisition device 11. Specifically, this may be because the acquisition card 112 does not support outputting notification signals, or because the acquisition card 112 is not connected to the marking control device 122.

[0218] In one implementation scenario, the acquisition time of the reference image frame may be obtained by the image detection device 121 monitoring the acquisition time of the reference image frame.

[0219] In the above manner, the processing device 12 cannot receive the notification signal of the image acquisition device 11 acquiring the image frame, and records the acquisition time of the image frame in response to the notification signal. The acquisition time of the reference image frame can be obtained by monitoring the acquisition time of the reference image frame.

[0220] Please refer to FIG8 , which is a flow chart of a pole piece marking method provided in some embodiments of the present application.

[0221] Step S810: Capture the electrode coil in the unwinding process to obtain the current image frame.

[0222] The electrode coil includes several sections of electrode, which are distinguished by corresponding positioning marks.

[0223] Step S820: Detect the current image frame.

[0224] Wherein, when it is detected that a positioning mark exists in the current image frame, step S830 is executed.

[0225] Step S830: determining the marking time of the target electrode based on the acquisition time of the reference image frame corresponding to the current image frame.

[0226] Among them, the target electrode is a electrode that can be distinguished by the detected positioning mark, the reference image frame is the current image frame or other image frames collected from the electrode coil, and the marking time is the time when the marking device is triggered to mark the target electrode.

[0227] For the relevant description of the above steps, please refer to the relevant content in the aforementioned embodiments, which will not be repeated here.

[0228] In some embodiments, determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame includes: obtaining the transmission time required for the pole piece coil to move the target distance during the unwinding process, the target distance being the distance between the markable position of the target pole piece and the marking device at the acquisition time of the reference image frame; determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0229] In some embodiments, determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame includes: taking the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, or, at the acquisition time of the reference image frame, determining the current marking waiting time of the target pole piece as the transmission time.

[0230] In some embodiments, the step of using the sum of the capture time and the transmission time of the reference image frame as the marking time of the target pole piece can be performed when a notification signal of the captured image frame can be received and the capture time of the image frame is recorded in response to the notification signal, wherein the reference image frame can be the current image frame.

[0231] In some embodiments, at the time of capturing the reference image frame, the step of determining that the current marking waiting time of the target pole piece is the transmission time is performed when a notification signal of the captured image frame cannot be received, and the reference image frame is other image frames after the current image frame. At the time of capturing the reference image frame, the step of determining that the current marking waiting time of the target pole piece is before the transmission time is also included: monitoring whether the reference image frame has been captured to obtain the capture time of the reference image frame.

[0232] In some embodiments, obtaining the transmission time required for the electrode coil to move the target distance during the unwinding process includes: determining the target distance using a preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame; and determining the transmission time using the target distance.

[0233] In a specific application scenario, the step of capturing the pole piece coil in the unwinding process is to perform image capture in response to the pulse signal emitted by the encoder. The target distance can be divided by the single pulse accuracy of the encoder to obtain the first pulse number used to characterize the transmission time to characterize the transmission time.

[0234] In some embodiments, the number of pulses of the encoder can be recorded each time an image frame is captured to obtain a second number of pulses, where the second number of pulses is the number of pulses recorded at the capture moment of the reference image frame; and it is determined that marking of the target pole piece is triggered when the recorded number of pulses reaches the sum of the first number of pulses and the second number of pulses.

[0235] In some embodiments, at the time of capturing the reference image frame, the marking of the target pole piece is triggered after the encoder sends a pulse signal with a first pulse number.

[0236] In some embodiments, the current image frame is detected, and when a positioning mark is detected in the current image frame, the step of determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame is performed by the image detection device 121, or is performed in cooperation with the image detection device 121 and the marking control device 122.

[0237] Therefore, the hardware device can be flexibly set according to the actual application needs to realize the determination of the marking time of the target electrode based on the acquisition time of the reference image frame corresponding to the current image frame, so as to adapt to the needs of different application scenarios.

[0238] The following description is made by taking an image detection device as an example. Specifically, the steps performed by the image detection device may include:

[0239] Step 1: Get the current image frame.

[0240] Step 2: Detecting the presence of a positioning mark in the current image frame.

[0241] Step 3: Trigger the determination of the marking time for the target electrode.

[0242] The current image frame may be obtained by capturing the electrode coil in the unwinding process by an image capturing device.

[0243] The target electrode is the electrode that can be distinguished by the positioning mark detected in the current image frame. The acquisition time of the reference image frame is the time when the image acquisition device acquires the reference image frame. The marking time is the time when the marking device is triggered to mark the target electrode.

[0244] The acquisition time of the reference image frame corresponding to the current image frame is used as a reference for marking the target pole piece associated with the positioning mark in the current image frame, and the marking time of the target pole piece is determined based on the reference.

[0245] In the above scheme, on the basis of determining that the current image frame contains the positioning mark, the acquisition time of the reference image frame associated with the current image frame is used as a reference to obtain the marking time of the target electrode distinguished by the positioning mark in the current image frame, so as to determine the marking time of the electrode marked with the positioning mark without relying on the setting action of the positioning mark, so as to realize the marking of the electrode coil with the positioning mark.

[0246] The above method can be applied to electrode coils that have been marked with positioning marks but have missed detection and marking. It does not rely on the setting action of the positioning marks but relies on visual inspection to achieve re-inspection and marking of the electrode coils. The electrode coils that have completed re-inspection and marking can enter the subsequent process. Compared with directly discarding the electrode coils that have been marked with positioning marks but missed detection and marking, it reduces waste and reduces costs.

[0247] In some embodiments, the determination of the marking time of the target pole piece can be completed by the aforementioned image detection device, and then the image detection device may trigger the determination of the marking time of the target pole piece by triggering its own acquisition time based on the reference image frame to determine the marking time of the target pole piece.

[0248] In some embodiments, the determination of the marking time of the target pole piece can be completed by a marking control device that is communicatively connected to the image detection device. Then, the image detection device may trigger the determination of the marking time of the target pole piece by sending a trigger signal to the marking control device, so that the marking control device determines the marking time of the target pole piece based on the acquisition time of the reference image frame in response to the trigger signal.

[0249] In some embodiments, the image detection device and a marking control device in communication therewith can be used to collaboratively determine the marking time of the target pole piece. Furthermore, the image detection device triggering the marking time of the target pole piece can include acquiring intermediate parameters for determining the marking time of the target pole piece, and transmitting the intermediate parameters to the marking control device, so that the marking control device can use the intermediate parameters to determine the marking time of the target pole piece.

[0250] It should be noted that the determination of the target electrode marking time can be performed in any of the following ways: independently by the image detection device, independently by the marking control device, or collaboratively by the image detection device and the marking control device. Of course, the determination of the target electrode marking time is not limited to one method, and can also be performed using multiple methods mentioned above, and the final marking time is obtained by combining the results obtained by the multiple methods.

[0251] In the above scheme, when it is determined that the current image frame contains a positioning mark, the image detection device can independently determine the marking time of the target pole piece, or trigger the marking control device to independently determine the marking time of the target pole piece, or cooperate with the marking control device to determine the marking time of the target pole piece. The image detection device, image detection device and marking control device can be flexibly set to adapt to different application scenarios.

[0252] In some embodiments, the marking time can be used to trigger a marking device to perform marking at the marking time. Specifically, a marking signal can be sent to the marking device to trigger the marking device to operate. The marking signal can be sent by an image detection device or by a marking control device.

[0253] The following description takes the step of determining the marking time performed by the image detection device as an example. Specifically, the determination of the marking time may include:

[0254] Step 1: Obtain the transmission time required for the electrode coil to move the target distance during the unwinding process.

[0255] Step 2: Determine the marking time of the target electrode based on the transmission time and the acquisition time of the reference image frame.

[0256] The target distance may be the distance between the markable position of the target electrode and the marking device at the time of acquisition of the reference image frame.

[0257] The markable position can be set according to actual needs, and can be a certain range or a certain position, which can adapt to various needs.

[0258] In some embodiments, the transmission time can be added to the reference image frame acquisition time, and the resulting time can be used as the marking time of the target electrode. Alternatively, the transmission time determined at the reference image frame acquisition time can be used as the current marking waiting time of the target electrode. That is, after waiting for the current marking waiting time from the reference image frame acquisition time, the marking device is triggered to mark.

[0259] Furthermore, the method of adding the transmission time and the acquisition time of the reference image frame and using the obtained time as the marking time of the target pole piece can be performed under the condition that the acquisition time of the image frame can be recorded through the notification signal of the image acquisition device.

[0260] Furthermore, the target device may receive a notification signal indicating that the image acquisition device has acquired an image frame, and record the acquisition time of the image frame in response to the notification signal. The target device may be an image detection device or a marking control device in communication with the image detection device.

[0261] By the above method, whether the target device can record the acquisition time of the image frame or not, it is possible to determine the marking time of the target electrode without relying on the setting time of the positioning mark.

[0262] In some embodiments, when the target device is capable of recording the capture time of the image frame through a notification signal from the image capture device, it is of course also possible to select other image frames other than the current image frame as the reference image frame.

[0263] Furthermore, the method of using the transmission time as the current marking waiting time of the target electrode at the time of capturing the reference image frame can be implemented in the case where the image frame capture time cannot be recorded by the notification signal of the image capture device. Specifically, the target device cannot receive the notification signal of the image capture device capturing the image frame.

[0264] It is understandable that, because the target device cannot record the capture time of the current image frame via the notification signal from the image capture device, the capture time of the current image frame cannot be determined, and thus it cannot be used as a reference image frame. Instead, an image subsequent to the current image frame that has not yet been captured can be used as a reference image frame. After determining the presence of a positioning mark in the current image frame, the capture time of the reference image frame can be obtained as a reference for the positioning time. Specifically, before determining that the current marking waiting time of the target electrode is equal to the transmission time at the capture time of the reference image frame, the image detection device can further perform the following steps: monitoring whether the reference image frame has been captured to obtain the capture time of the reference image frame.

[0265] In some embodiments, the aforementioned step of determining the marking time may also be performed by a marking control device.

[0266] The following description is made by taking the step of determining the transmission time consumption as an example, where the image detection device performs the step. Specifically, the determination of the transmission time consumption may include:

[0267] Step 1: Determine the target distance using the preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame.

[0268] Step 2: Use the target distance to determine the transmission time.

[0269] Among them, the image acquisition device and the marking device are both arranged on the path of unwinding the electrode coil, and the distance between the two is a preset distance and can be adjusted according to actual needs. The current image frame is detected with respect to the positioning mark, and the position of the positioning mark in the current image frame can also be obtained. The distance between the positioning mark and the markable position can be preset according to actual needs. Since the length of the electrode coil captured by the image frame can be a preset length, the distance between the current image frame and the reference image frame represents the distance the electrode coil moves during the time interval between the current image frame and the reference image frame, which can be determined based on the length of the electrode coil that can be captured by a single image frame and the number of image frames in between.

[0270] In some embodiments, the aforementioned step of determining the transmission time consumption may also be performed by the marking control device.

[0271] The following description is made by taking an image detection device as an example. Specifically, the steps performed by the image detection device may include:

[0272] Step 1: Get the current image frame.

[0273] Step 2: Detecting the presence of a positioning mark in the current image frame.

[0274] Step 3: Send a trigger signal to the marking control device.

[0275] For steps 1 to 3 above, reference may be made to the relevant descriptions in the aforementioned embodiment. In this embodiment, the marking time of the target electrode piece can be determined independently by the marking control device. The image detection device and the marking control device can be communicatively connected. When the image detection device detects the presence of a positioning mark in the current image frame, it can send a trigger signal to the marking control device to trigger the marking control device to determine the marking time of the target electrode piece based on the acquisition time of the reference image frame.

[0276] The following uses defect marking as an example for illustration. The same applies to other markings, so we will not provide examples here. Steps 4 through 6 below can be used to determine whether a target electrode needs to be marked. Determining whether a target electrode needs to be marked can be performed by an image detection device.

[0277] Step 4: From a plurality of image frames acquired by the same image acquisition device from the electrode sheet coil, a plurality of image frames including at least a portion of the target electrode sheet are searched.

[0278] Step 5: Using a plurality of image frames that at least contain a portion of the target pole piece, perform defect detection on the target pole piece to obtain a defect detection result of the target pole piece.

[0279] Step 6: Based on the defect detection result of the target electrode, determine whether to trigger the marking device to mark the target electrode.

[0280] Step 7: Trigger the marking device to mark the target electrode.

[0281] The triggering of the marking device to mark the target electrode piece may be performed by the image detection device or the marking control device. The triggering of the marking device to mark the target electrode piece may be based on the marking time and the result of determining whether to trigger the marking device to mark the target electrode piece.

[0282] In the above scheme, by detecting the defects of the image frame containing the target electrode, it is determined whether to trigger the marking device to mark the target electrode according to whether the target electrode contains defects. This can distinguish between normal electrodes and defective electrodes for reference in subsequent processing, thereby reducing the impact of defective electrodes.

[0283] In some embodiments, the image detection device can notify the marking control device after determining whether to trigger the marking device to mark the target pole piece. If the target pole piece needs to be marked, the marking control device sends a marking signal of the target pole piece to the marking device, so that the marking device performs marking at the marking time, thereby marking the markable position of the target pole piece.

[0284] The following description takes the image detection device as an example. Specifically, the image detection device may perform the following steps:

[0285] Step 1: Get the current image frame.

[0286] Step 2: Detecting the presence of a positioning mark in the current image frame.

[0287] Step 3: Obtain intermediate parameters for determining the marking time of the target electrode, and send the intermediate parameters to the marking control device.

[0288] The above steps can refer to the relevant descriptions in the previous embodiment. In this embodiment, the determination of the marking time of the target electrode piece can be completed by the image detection device and the marking control device in collaboration. Specifically, the image detection device is used to obtain intermediate parameters for determining the marking time of the target electrode piece, and the marking control device can be used to determine the marking time of the target electrode piece using the intermediate parameters.

[0289] The intermediate parameters may include a plurality of parameters that can be used independently to obtain the marking time, and the marking control device may determine the final marking time by synthesizing the marking times obtained based on the various parameters.

[0290] In the above solution, the image detection device obtains the target distance or transmission time as an intermediate parameter, so that the marking control device can obtain the marking time based on the intermediate parameter, thereby realizing the image detection device and the marking control device collaboratively determining the marking time.

[0291] In a specific application scenario, if the image frame capture time can be recorded via a notification signal from an image capture device, the current image frame can be used as a reference image frame. Upon detecting the presence of a positioning mark in the current image frame, the image detection device can determine the target distance and send this target distance as an intermediate parameter to the marking control device. This allows the marking control device to determine the marking time of the target electrode based on the target distance and the recorded capture time of the current image frame. Furthermore, the marking time of the target electrode can be provided to a device that triggers the marking device for subsequent use.

[0292] In a specific application scenario, if the image acquisition device cannot record the capture time of the image frame through the notification signal of the image acquisition device, the image frame after the current image frame can be used as a reference image frame. If the image detection device detects the presence of a positioning mark in the current image frame, it can determine the target distance and send the target distance as an intermediate parameter to the marking control device. The marking control device then determines the marking time of the target electrode based on the target distance combined with the capture time of the current image frame obtained by monitoring.

[0293] In a specific application scenario, the determination of the marking time of the target pole piece can be independently completed by the image detection device. Then, the image detection device's execution of determining the triggering marking time of the target pole piece can include the aforementioned steps of obtaining the transmission time, and determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame. Furthermore, the image detection device determines the target distance using a preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame; determines the transmission time using the target distance; and determines the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0294] In a specific application scenario, the determination of the marking time of the target pole piece can be independently completed by a marking control device that is communicatively connected to the image detection device. Then, the image detection device can trigger the determination of the marking time of the target pole piece by sending a trigger signal to the marking control device, so that the marking control device determines the marking time of the target pole piece based on the acquisition time of the reference image frame in response to the trigger signal. The marking control device performs the aforementioned steps of obtaining the transmission time, and determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame. Furthermore, the marking control device determines the target distance using the preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame, determines the transmission time using the target distance, and determines the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0295] In a specific application scenario, the determination of the marking time of the target electrode piece can be accomplished collaboratively by an image detection device and a marking control device in communication therewith. Furthermore, the image detection device triggering the marking time of the target electrode piece can include acquiring intermediate parameters for determining the marking time of the target electrode piece, and transmitting the intermediate parameters to the marking control device, so that the marking control device can determine the marking time of the target electrode piece using the intermediate parameters. The marking control device is configured to determine the marking time of the target electrode piece based on the intermediate parameters.

[0296] The following description takes the execution subject as a marking control device as an example. Specifically, the method may include:

[0297] Step 1: Receive a time determination signal regarding a target pole piece sent by an image detection device.

[0298] Step 2: Determine the marking time of the target electrode based on the acquisition time of the reference image frame corresponding to the current image frame.

[0299] The description of step 2 can refer to the relevant content of the aforementioned embodiment. The moment determination signal can be sent when the image detection device detects the presence of a positioning mark in the current image frame. The current image frame is obtained by the image acquisition device capturing a pole piece coil in the unwinding process. The positioning mark is used to distinguish pole pieces in the pole piece coil. The target pole piece is the pole piece that can be distinguished by the positioning mark detected by the image detection device in the current image frame.

[0300] It can be understood that the timing determination signal regarding the target pole piece can be used to prompt the marking control device to determine the marking timing of the target pole piece.

[0301] The reference image frame may be the current image frame or other image frames acquired from the electrode coil. The marking time may be the time when the marking device is triggered to mark the target electrode.

[0302] In the above scheme, based on the image detection device determining that the current image frame contains a positioning mark, the marking control device can use the acquisition time of the reference image frame associated with the current image frame as a reference, thereby obtaining the marking time of the target electrode distinguished by the positioning mark in the current image frame, and can determine the marking time of the electrode marked with the positioning mark without relying on the setting time of the positioning mark, so as to realize the marking of the electrode coil with the positioning mark.

[0303] Specifically, based on the acquisition time of the reference image frame corresponding to the current image frame, determining the marking time of the target pole piece may include: obtaining the transmission time required for the pole piece coil to move the target distance during the unwinding process, and determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame.

[0304] In the above scheme, by taking the acquisition time of the reference image frame as the benchmark reference, the time consumed for the markable position of the target pole piece to move from the position at the acquisition time of the reference image frame to the marking device is determined, and the marking time of the target pole piece is determined, thereby being able to determine the marking time of the markable position of the target pole piece without relying on the setting time of the positioning mark, thereby improving the accuracy of the pole piece marking position.

[0305] Furthermore, the moment determination signal can be a trigger signal in the aforementioned embodiment. After determining that the image detection device determines that there is a positioning mark in the current image frame, the determination of the marking time of the target electrode can be independently executed by the marking control device. Obtaining the transmission time required for the electrode coil to move the target distance during the unwinding process can include: using the preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame to determine the target distance.

[0306] The position of the positioning mark in the current image frame can be obtained during positioning mark detection of the current image frame, or can be obtained from a trigger signal of an image detection device. The preset distance between the image acquisition device and the marking device, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame can also be preset.

[0307] Furthermore, after the image detection device determines that a positioning mark exists in the current image frame, the marking time of the target electrode can be determined collaboratively by the marking control device and the image detection device. The time determination signal can include an intermediate parameter determined by the image detection device. The marking control device can obtain the intermediate parameter from the time determination signal and use the intermediate parameter to obtain the transmission time. The intermediate parameter can be the target distance or the transmission time.

[0308] In the above scheme, based on the image detection device determining that the current image frame contains a positioning mark, the execution device can independently determine the marking time, or cooperate with the image detection device, and the image detection device determines the intermediate parameters, and the execution device determines the marking time based on the intermediate parameters. The execution device, the execution device and the image detection device can be flexibly set to adapt to different application scenarios.

[0309] In some embodiments, when a target device is capable of receiving a notification signal indicating that an image frame has been captured by an image capture device and, in response to the notification signal, records the capture time of the image frame, determining the marking time of the target pole piece based on the transmission time and the capture time of the reference image frame includes: using the sum of the capture time of the reference image frame and the transmission time as the marking time of the target pole piece. The target device may be a marking control device.

[0310] In the above scheme, when the target device is able to record the acquisition time of the image frame, the current image frame can be selected as the reference image frame. The acquisition time of the recorded reference image frame can be directly combined with the transmission time to obtain the exact time point of the marking moment, thereby realizing the determination of the marking moment of the target pole piece without relying on the setting time of the positioning mark.

[0311] In some embodiments, when a target device is unable to receive a notification signal indicating that an image frame has been captured by an image capture device, determining a marking time for the target pole piece based on the transmission time and the capture time of a reference image frame includes: at the capture time of the reference image frame, determining the current marking waiting time of the target pole piece as the transmission time, and the reference image frame as an image frame subsequent to the current image frame. The target device may be a marking control device.

[0312] In the above scheme, when the target device is unable to record the acquisition time of the image frame, the acquisition time of the reference image frame that has not yet been acquired after the current image frame containing the positioning mark can also be used to obtain the acquisition time of the reference image frame, and the time after the waiting time for transmission is determined as the marking time, so as to realize the determination of the marking time of the target pole piece without relying on the setting time of the positioning mark.

[0313] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0314] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation methods described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, units or components can be combined or integrated into another subsystem, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0315] In addition, the functional units in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

Claims

1. A pole piece marking system, characterized in that: The system comprises: An image acquisition device is used to acquire the image of the pole piece coil in the unwinding process to obtain a current image frame, wherein the pole piece coil includes a plurality of pole pieces, and the plurality of pole pieces are distinguished by corresponding positioning marks; A processing device is communicatively connected with the image acquisition device, and is used to detect the current image frame. When the positioning mark is detected in the current image frame, the marking time of the target pole piece is determined based on the acquisition time of the reference image frame corresponding to the current image frame. The target pole piece is a pole piece that can be distinguished by the detected positioning mark, the reference image frame is the current image frame or other image frames acquired from the pole piece coil, and the marking time is the time when the marking device is triggered to mark the target pole piece.

2. The system according to claim 1, characterized in that The processing device is used to determine the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame, including: Obtaining the transmission time required for the pole piece coil to move a target distance during the unwinding process, wherein the target distance is the distance between the markable position of the target pole piece and the marking device at the time of acquisition of the reference image frame; Based on the transmission time and the acquisition time of the reference image frame, the marking time of the target pole piece is determined.

3. The system according to claim 2, characterized in that The processing device is used to determine the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame, including: The sum of the acquisition time of the reference image frame and the transmission time is used as the marking time of the target pole piece, or, at the acquisition time of the reference image frame, the current marking waiting time of the target pole piece is determined to be the transmission time.

4. The system according to claim 3, characterized in that The image acquisition device is also used to send a notification signal to the processing device in response to acquiring an image frame; The reference image frame is the current image frame. The processing device is also used to receive a notification signal that the image acquisition device has acquired an image frame, and to record the acquisition time of the image frame in response to the notification signal to obtain the acquisition time of the reference image frame. The acquisition time of the reference image frame is used to sum with the transmission time as the marking time of the target pole piece.

5. The system according to claim 4, characterized in that The image acquisition device comprises: A camera is used to collect the pole piece coil in the unwinding process to obtain an image frame; The acquisition card is respectively connected to the camera and the processing device for sending a notification signal to the processing device in response to the acquisition of an image frame, and sending the image frame to the processing device so that the processing device detects the current image frame.

6. The system according to claim 4, characterized in that The pole piece marking system further comprises an encoder, which is respectively connected to the processing device and the image acquisition device for communicating with each other and is used to send pulse signals to the processing device and the image acquisition device respectively; The image acquisition device is used to perform image acquisition in response to the pulse signal; The processing device is used to record the acquisition time of the image frame in response to the notification signal, including: In response to the notification signal, the number of pulses issued by the encoder at the acquisition moment of the image frame is recorded.

7. The system according to claim 3, characterized in that The reference image frame is another image frame after the current image frame. The processing device is also used to monitor whether the reference image frame has been acquired when the positioning mark is detected in the current image frame, so as to obtain the acquisition time of the reference image frame. The acquisition time of the reference image frame is used as the starting time of the current marking waiting time of the target pole piece, so as to obtain the marking time of the target pole piece.

8. The system according to claim 3, characterized in that The processing device is used to obtain the transmission time required for the pole piece coil to move the target distance during the unwinding process, including: The preset distance between the image acquisition device and the marking device, the position of the positioning mark in the current image frame, the distance between the positioning mark and the markable position, and the distance between the current image frame and the reference image frame are used. The distance between image frames is used to determine the target distance; The transmission time is determined using the target distance.

9. The system according to claim 8, characterized in that The pole piece marking system further comprises an encoder, which is communicatively connected with the image acquisition device and is used to send a pulse signal to the image acquisition device; The image acquisition device is used to perform image acquisition in response to the pulse signal; The processing device is used to determine the transmission time by using the target distance, including: Dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; The processing device is used to use the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece, including: Recording the number of pulses of the encoder each time the image acquisition device acquires an image frame to obtain a second number of pulses, wherein the second number of pulses is the number of pulses recorded at the acquisition moment of the reference image frame; It is determined that when the recorded pulse number reaches the sum of the first pulse number and the second pulse number, marking of the target pole piece is triggered.

10. The system according to claim 8, characterized in that The pole piece marking system further comprises an encoder, which is respectively connected to the image acquisition device and the processing device for communicating with each other and is used to send pulse signals to the processing device and the image acquisition device respectively; The image acquisition device is used to perform image acquisition in response to the pulse signal; The processing device is used to determine the transmission time by using the target distance, including: Dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; The processing device is used to determine the current marking waiting time of the target pole piece as the transmission time at the acquisition time of the reference image frame, including: At the acquisition moment of the reference image frame, the marking of the target pole piece is triggered after the encoder sends a pulse signal with the first pulse number.

11. The system according to claim 1, characterized in that The processing device is also used for: From a plurality of image frames acquired by the image acquisition device from the pole piece coil, searching for a plurality of image frames that at least include a portion of the target pole piece; Using the plurality of image frames at least including a portion of the target pole piece, performing defect detection on the target pole piece to obtain a defect detection result of the target pole piece; Based on the defect detection result of the target pole piece, it is determined whether to trigger the marking device to mark the target pole piece.

12. The system according to claim 11, characterized in that The processing device is used to determine whether to trigger the marking device to mark the target pole piece based on the defect detection result of the target pole piece, including: In response to the defect detection result indicating that the target pole piece does not have a defect, canceling the sending of a marking signal of the target pole piece to the marking device, wherein the marking signal is used to instruct the marking device to mark the target pole piece as having a defect; In response to the defect detection result indicating that the target pole piece has a defect, retaining the sending of a marking signal for the target pole piece to the marking device.

13. The system according to claim 1, characterized in that There are multiple image acquisition devices, which are respectively arranged at different positions, for acquiring images at different positions on the transmission path of the pole sheet coil; At least two of the plurality of image acquisition devices are used as target image acquisition devices, and each of the target image acquisition devices is used to acquire images of the pole piece coil in the unwinding process to obtain a current image frame of the target image acquisition device; The processing device is also used for: In response to the determination of the marking time of the target pole piece corresponding to the target image acquisition device, the marking time of the target pole piece is updated using the latest determined marking time of the target pole piece corresponding to the target image acquisition device.

14. The system according to claim 13, characterized in that The target image acquisition device includes a first target image acquisition device arranged before the pole piece coil is stripped, and a second target image acquisition device arranged after the pole piece coil is stripped.

15. The system according to claim 1, characterized in that The electrode coil is unwound by the unwinding device of the die-cutting and slitting machine, and the electrode coil is provided with the positioning mark before unwinding. During the unwinding of the electrode coil, the mark setting device in the die-cutting and slitting machine for setting the positioning mark does not work; And / or, the positioning mark is a segmentation mark used to segment two adjacent pole pieces; And / or, the other image frames are acquired from the pole piece coil after the current image frame.

16. The system according to claim 1, characterized in that The processing device comprises: An image detection device is used to detect the current image frame, and when the positioning mark is detected in the current image frame, determine the marking time of the target electrode based on the acquisition time of the reference image frame corresponding to the current image frame; or The processing device comprises: An image detection device and a marking control device that are communicatively connected, wherein the image detection device is used to detect the current image frame, detect the presence of the positioning mark in the current image frame, and send a trigger signal to the marking control device, wherein the marking control device is used to determine the marking time of the target electrode based on the acquisition time of the reference image frame in response to the trigger signal; or The processing device comprises: An image detection device and a marking control device are communicatively connected, wherein the image detection device is used to detect the current image frame, detect the presence of the positioning mark in the current image frame, obtain intermediate parameters for determining the marking time of the target pole piece, and send the intermediate parameters to the marking control device, and the marking control device is used to determine the marking time of the target pole piece using the intermediate parameters.

17. The system according to claim 16, characterized in that The intermediate parameters include the target distance or the transmission time required for the pole piece coil to move the target distance during the unwinding process. The target distance is the distance between the markable position of the target pole piece and the marking device at the time of acquisition of the reference image frame.

18. The system according to claim 16, characterized in that There are multiple image acquisition devices, which are respectively arranged at different positions, for acquiring images at different positions on the transmission path of the pole sheet coil; At least two of the plurality of image acquisition devices are used as target image acquisition devices, and each of the target image acquisition devices is used to acquire images of the pole piece coil in the unwinding process to obtain a current image frame of the target image acquisition device; There are multiple image detection devices, and each of the image detection devices is used to communicate with at least one of the target image acquisition devices, and is at least used to detect the current image frame of the connected target image acquisition device.

19. The system according to claim 1, characterized in that The system also includes a marking device, which is communicatively connected to the processing device. The processing device is also used to send a marking instruction to the marking device at the marking time, and the marking device is used to mark the target pole piece in response to the marking instruction.

20. A pole piece marking method, characterized in that: The method comprises: The pole piece coil in the unwinding process is captured to obtain a current image frame, wherein the pole piece coil includes a plurality of pole pieces, and the plurality of pole pieces are distinguished by corresponding positioning marks; The current image frame is detected, and when the positioning mark is detected in the current image frame, the marking time of the target pole piece is determined based on the acquisition time of the reference image frame corresponding to the current image frame, the target pole piece is a pole piece that can be distinguished by the detected positioning mark, the reference image frame is the current image frame or other image frames acquired from the pole piece coil, and the marking time is the time when the marking device is triggered to mark the target pole piece.

21. The method according to claim 20, characterized in that The step of determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame includes: Obtaining the transmission time required for the pole piece coil to move a target distance during the unwinding process, wherein the target distance is the distance between the markable position of the target pole piece and the marking device at the time of acquisition of the reference image frame; Based on the transmission time and the acquisition time of the reference image frame, the marking time of the target pole piece is determined.

22. The method according to claim 21, characterized in that The step of determining the marking time of the target pole piece based on the transmission time and the acquisition time of the reference image frame comprises: The sum of the acquisition time of the reference image frame and the transmission time is used as the marking time of the target pole piece, or, at the acquisition time of the reference image frame, the current marking waiting time of the target pole piece is determined to be the transmission time.

23. The method according to claim 22, characterized in that The step of using the sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece is performed when a notification signal of the acquisition of the image frame can be received and the acquisition time of the image frame is recorded in response to the notification signal, and the reference image frame is the current image frame.

24. The method according to claim 22, characterized in that The step of determining, at the acquisition time of the reference image frame, that the current marking waiting time of the target pole piece is the transmission time consumption is performed when a notification signal of the image frame being acquired cannot be received, the reference image frame is another image frame after the current image frame, and the step of determining, at the acquisition time of the reference image frame, that the current marking waiting time of the target pole piece is before the transmission time consumption further includes: Monitor whether the reference image frame has been captured to obtain the capture time of the reference image frame.

25. The method according to claim 22, characterized in that The time consumption required for obtaining the target moving distance of the pole piece coil during the unwinding process includes: The target distance is determined by using a preset distance between an image acquisition device and the marking device, a position of the positioning mark in the current image frame, a distance between the positioning mark and the markable position, and a distance between the current image frame and the reference image frame; and the transmission time is determined by using the target distance.

26. The method according to claim 25, characterized in that The step of collecting the pole piece coil in the unwinding process is to perform image collection in response to the pulse signal sent by the encoder, and the step of determining the transmission time by using the target distance includes: Dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; The sum of the acquisition time of the reference image frame and the transmission time as the marking time of the target pole piece includes: Recording the number of pulses of the encoder each time an image frame is captured to obtain a second number of pulses, wherein the second number of pulses is the number of pulses recorded at the time of capturing the reference image frame; It is determined that when the recorded pulse number reaches the sum of the first pulse number and the second pulse number, marking of the target pole piece is triggered.

27. The method according to claim 25, characterized in that The step of collecting the pole piece coil in the unwinding process is to perform image collection in response to the pulse signal sent by the encoder, and the step of determining the transmission time by using the target distance includes: Dividing the target distance by the single pulse accuracy of the encoder to obtain a first pulse number used to characterize the transmission time; The step of determining the current marking waiting time of the target pole piece as the transmission time consumption at the acquisition time of the reference image frame comprises: At the acquisition moment of the reference image frame, the marking of the target pole piece is triggered after the encoder sends a pulse signal with the first pulse number.

28. The method according to claim 20, characterized in that The step of detecting the current image frame and, when the positioning mark is detected in the current image frame, determining the marking time of the target pole piece based on the acquisition time of the reference image frame corresponding to the current image frame is performed by an image detection device, or by the image detection device and a marking control device in cooperation with each other.

Images