Pole piece marking method, device, system, computer device, medium and product

Abstract

The application relates to a kind of pole piece marking method, device, system, computer equipment, medium and product, pole piece is subjected to laser etching process, in the case where forming notch on surface, in combination with the notch on the surface of pole piece, the area width of pole piece corner region is identified, and the cutting position of pole piece segment for winding to form single battery is determined with area width, and then the single battery pole piece with notch defect can be marked according to the cutting position.The scheme, for the pole piece without die cutting, can also identify the cutting position of single battery pole piece in combination with the notch on the surface of pole piece, provide basis for the marking of notch defect, so that the notch quality of pole piece in notch process can be controlled.When the single battery pole piece with notch defect is identified, it can be marked according to the single battery it belongs to, effectively reduce the possibility of defective product flowing into subsequent pole piece processing process.

Description

Technical Field

[0001] This application relates to the field of battery processing technology, and in particular to electrode marking methods, apparatus, systems, computer equipment, media, and products. Background Technology

[0002] With the development of new energy technologies, secondary batteries, represented by lithium batteries, are gradually being applied to various fields such as energy storage systems, electric vehicles, and aerospace, bringing great convenience to people's daily production and life. Laser etching is a new process in which laser etching is used to create grooves of a certain depth in the film area of ​​the electrode during the cell processing, thereby improving the electrolyte's ability to wet the electrode and playing an important role in increasing the cell capacity.

[0003] However, the scoring process can affect the quality of the electrode sheets, leading to defective products being introduced into subsequent electrode sheet processing. Summary of the Invention

[0004] Therefore, it is necessary to provide an electrode marking method, apparatus, system, computer equipment, medium, and product to control the marking quality of electrodes in the marking process and reduce the possibility of defective products flowing into subsequent electrode processing.

[0005] This application provides an electrode marking method, comprising: identifying the width of the corner area of ​​the electrode by combining the scratches on the electrode surface; determining the cutting position of a single-cell electrode based on the width of the area; wherein the single-cell electrode is an electrode segment wound to form a single cell in the electrode; and marking the single-cell electrode with scratch defects according to the cutting position.

[0006] The above-described scheme, where the electrode sheet undergoes laser etching to create surface markings, allows for the identification of the corner area width of the electrode sheet based on these markings. This area width then determines the cutting position of the electrode sheet segment wound to form a single cell. Furthermore, based on the cutting position, single-cell electrode sheets with marking defects can be marked. This scheme also applies to electrode sheets that have not undergone die-cutting, using the surface markings to identify the cutting position of single-cell electrode sheets, providing a basis for marking marking defects. This allows for quality control of the marking process. When single-cell electrode sheets with marking defects are identified, they can be marked according to their respective cells, effectively reducing the possibility of defective products entering subsequent electrode sheet processing.

[0007] In some embodiments, identifying the region width of the electrode corner area by combining the scratches on the electrode surface includes: acquiring images of the scratches on the electrode surface to obtain scratch image information; and performing image recognition based on the scratch image information to determine the region width of the electrode corner area.

[0008] The above solution determines the width of the corner area of ​​the electrode by acquiring and recognizing images of the scratches on the electrode surface. It has the advantages of high recognition accuracy and low cost.

[0009] In some embodiments, the step of performing image recognition based on the scratch image information to determine the region width of the electrode corner area includes: identifying target scratches based on the scratch image information; the target scratches representing the scratches in the scratched region of the electrode that have the smallest distance to the adjacent corner area; and using the distance between the target scratches as the region width of the electrode corner area.

[0010] The above solution differentiates the markings on both sides of the electrode corner area to facilitate identification. By identifying these target markings, the electrode corner area can be accurately located, and the area width can be identified. This method has the advantage of high accuracy in area width identification.

[0011] In some embodiments, the step of performing image recognition based on the scratch image information to determine the region width of the electrode corner area includes: performing image recognition on the scratch image information to determine the scratch spacing between any adjacent scratches; identifying the electrode corner area based on the scratch spacing; and using the scratch spacing corresponding to the electrode corner area as the region width of the electrode corner area.

[0012] The above scheme, by combining the distance between all the engravings, and based on the principle that there is a difference between the spacing of the engravings at the corners and the general engravings, can identify the corner area and the width of the area of ​​the electrode, without the need to differentiate the engravings, thereby improving the efficiency of laser etching and the consistency between the engravings.

[0013] In some embodiments, identifying the electrode corner region based on the groove spacing includes: identifying two grooves corresponding to the groove spacing that exceed a preset standard spacing range; and taking the area between the two identified grooves as the electrode corner region.

[0014] The above scheme directly compares and analyzes the scribe line spacing with the preset standard spacing range to identify the area corresponding to the scribe line spacing that exceeds the range, which is then used as the electrode corner area. It has the advantages of simple electrode corner area identification method, high identification efficiency and high identification accuracy.

[0015] In some embodiments, determining the cutting position of a single-cell electrode based on the region width includes: determining the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between adjacent region widths; and determining the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

[0016] The above scheme is based on the principle that the width of the corner area gradually increases as the number of winding layers increases during the winding process of a single wound cell, and identifies the cutting position of the single cell electrode, which has high accuracy and efficiency in cutting position identification.

[0017] In some embodiments, marking the single-cell electrode sheet with a scoring defect according to the cutting position includes: determining the marking position according to the cutting position of the single-cell electrode sheet with a scoring defect; and controlling a marking machine to mark at the marking position.

[0018] The above scheme, after determining the marking position by combining the cutting position, marks the single-cell electrode sheet, thereby achieving accurate calibration of the single-cell electrode sheet with scoring defects and improving the marking accuracy of scoring defects.

[0019] In some embodiments, the method further includes: calibrating the die-cutting position of the single-cell electrode sheet according to the cutting position; wherein the die-cutting position is used to determine the winding marking hole of the single-cell electrode sheet.

[0020] The above scheme can also be combined with the cutting position to calibrate the die-cutting position of the single cell electrode, improve the consistency between the die-cutting position and the cutting position, and thus improve the accuracy of electrode processing.

[0021] In some embodiments, the step of marking the die-cutting position of the single-cell electrode sheet according to the cutting position includes: identifying the cutting position of the electrode sheet; and using the cutting position as the die-cutting position of the single-cell electrode sheet.

[0022] The above solution directly uses the cutting position as the die-cutting position of the single-cell electrode, so that the die-cutting machine can directly perform electrode die-cutting based on the cutting position, making the die-cutting position coincide with the cutting position, which greatly improves the consistency between the two.

[0023] In some embodiments, the step of calibrating the die-cutting position of the single-cell electrode sheet according to the cutting position includes: aligning the initial die-cutting position with the initial cutting position; correcting the basic die-cutting position generated by the die-cutting machine according to the cutting position to determine the die-cutting position of the single-cell electrode sheet.

[0024] The above scheme maintains the consistency between the die-cutting position and the cutting position by aligning the initial position and continuously feeding back and correcting deviations during the die-cutting process, reducing the requirements for real-time data transmission and making it easy to implement.

[0025] This application also provides an electrode marking device, comprising: a corner recognition module for identifying the width of a corner region of the electrode by combining the markings on the electrode surface; a cutting recognition module for determining the cutting position of a single-cell electrode based on the region width; wherein the single-cell electrode is an electrode segment wound to form a single cell; and a marking control module for marking the single-cell electrode with marking defects based on the cutting position.

[0026] This application also provides an electrode marking system, including an image acquisition component, a control component, and a marking machine. The image acquisition component and the marking machine are respectively connected to the control component. The image acquisition component is used to acquire images of the laser-etched electrode to determine the marking marks on the surface of the electrode. The control component is used to implement the steps of the above-described electrode marking method.

[0027] This application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the above-described electrode marking method.

[0028] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described electrode marking method.

[0029] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described electrode marking method. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is a schematic diagram of the wound cell structure in some embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the electrode unfolding structure in some embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the electrode marking method in some embodiments of this application;

[0034] Figure 4 This is a schematic flowchart of the electrode marking method in some other embodiments of this application;

[0035] Figure 5This is a schematic diagram of the image acquisition component structure in some embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the signal interaction of the control components in some embodiments of this application;

[0037] Figure 7 This is a schematic diagram of the area width calculation process in some embodiments of this application;

[0038] Figure 8 This is a schematic diagram of the markings on the electrode sheet in some embodiments of this application;

[0039] Figure 9 This is a schematic diagram of the area width calculation process in some other embodiments of this application;

[0040] Figure 10 This is a schematic flowchart of the electrode marking method in some other embodiments of this application;

[0041] Figure 11 This is a schematic flowchart of the electrode marking method in some embodiments of this application;

[0042] Figure 12 This is a schematic flowchart of the electrode marking method in some embodiments of this application;

[0043] Figure 13 This is a schematic diagram of the die-cutting position calibration process in some embodiments of this application;

[0044] Figure 14 This is a schematic diagram of the die-cutting process line structure in some embodiments of this application;

[0045] Figure 15 This is a schematic diagram of electrode state transitions in some embodiments of this application;

[0046] Figure 16 This is a schematic diagram of the die-cutting position calibration process in some other embodiments of this application;

[0047] Figure 17 This is a schematic diagram of the electrode marking device structure in some embodiments of this application;

[0048] Figure 18 This is a schematic diagram of the electrode marking device structure in some other embodiments of this application;

[0049] Figure 19 This is a schematic diagram of the electrode marking system structure in some embodiments of this application;

[0050] Figure 20 This is a schematic diagram of the internal structure of a computer device in some embodiments of this application. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] Currently, judging from market trends, battery applications are becoming increasingly widespread. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As the application areas of batteries continue to expand, the market demand is also constantly increasing.

[0059] To improve electrolyte wetting ability and increase cell capacity during battery manufacturing, a laser etching process has been proposed. After coating and cold pressing, laser etching technology is used to etch the film area (the functional area coated with active material) of the electrode, creating indentations. The etched electrode then proceeds to die-cutting, winding, and other processes to form the finished battery cell. However, when using laser-etched electrodes to form finished cells, the yield rate of the cells decreases.

[0060] Studies have found that the markings on defective battery cells differ from those on good battery cells in terms of marking depth, length, and width. This indicates that marking quality affects the yield of battery cells, making it crucial to control marking quality.

[0061] However, at present, laser etching is generally carried out before die cutting. At this time, the electrode has not been die-cut. Even if the etching defect is detected, it is not possible to mark the electrode segment with the etching defect that is used to wind a single cell. This is not conducive to the subsequent removal of the electrode segment with the etching defect.

[0062] In-depth research revealed that laser etching is primarily used in wound battery cells. The etching marks are mainly concentrated on the large surfaces, namely the front and back surfaces of the wound cell, specifically the flat areas formed by the parallel stacking of electrodes and separators, which can also be called the etching areas. To reduce safety hazards, the corners of the battery cell, i.e., the transition areas formed by the bending of the electrodes and separators at the winding needle, must not have etching marks. As the number of winding layers increases, the corners of the wound battery cell gradually widen. Based on this, it is possible to distinguish the electrode segments used to wind individual battery cells by identifying the width changes of the electrode corner areas. This would allow for precise marking and rejection of electrode segments with etching defects in individual battery cells without die-cutting.

[0063] Based on the above considerations, this application provides an electrode marking method. When the electrode is laser etched and grooves are formed on the surface, the width of the corner area of ​​the electrode can be identified by combining the grooves on the electrode surface. The cutting position of the electrode segment wound to form a single cell can be determined by the width of the area. Then, the single cell electrode with groove defects can be marked according to the cutting position.

[0064] The above-described solution, even for electrode sheets that have not undergone die-cutting, can identify the cutting position of a single-cell electrode sheet by combining the markings on the electrode sheet surface. This provides a basis for marking marking defects, thereby enabling the control of the marking quality of the electrode sheets during the marking process. When a single-cell electrode sheet with marking defects is identified, it can be marked according to its corresponding single cell, effectively reducing the possibility of defective products flowing into subsequent electrode sheet processing.

[0065] The electrode marking method provided in this application is applied to electrodes that have undergone laser etching to obtain markings but have not been cut by a die-cutting machine. In the electrode battery manufacturing process, it falls between the cold pressing and die-cutting processes. For example, it can be applied in a process for detecting marking defects in laser-etched electrodes, or integrated into the laser etching process. It only needs to ensure that the identified single-cell electrodes can be marked based on the results of the marking defect detection.

[0066] The electrode sheet involved in the embodiments of this application is specifically an electrode sheet used for processing wound battery cells. For details on wound battery cells, please refer to... Figure 1 The large surface area is used as the etching zone, where etching is performed to create the etching pattern. However, the corners where the front and rear surfaces (i.e., the large surfaces) of the electrode connect are not etched, reducing the risk of safety hazards. The unfolded shape of a single-cell electrode can be found in the reference [reference needed]. Figure 2 For the same battery cell, as the number of winding layers increases, the width of the corner area of ​​the single cell electrode also gradually increases.

[0067] Please see Figure 3This application provides an electrode labeling method, including steps 302, 304 and 306.

[0068] Step 302: Combine the markings on the electrode surface to identify the width of the corner area of ​​the electrode.

[0069] Specifically, grooves are created by laser etching on the large surface of the electrode, resulting in very shallow (e.g., micrometer-level) trenches. The etched area is also called the grooved region. The electrode corner region is the transition area formed when the electrode and separator bend at the winding needle. In a laser-etched but uncut electrode, grooved and corner regions alternate. The region width refers to the length of the electrode corner region in the electrode's travel direction; it can also be understood as the distance between two large surfaces adjacent to the same electrode corner region.

[0070] It is understood that there is no single way to identify the width of the electrode corner area. In one embodiment, the area width can be obtained through image acquisition and identification. In another embodiment, the markings on the electrode can be identified based on the presence of a certain depth of the markings, combined with signal reflection ranging (such as infrared or ultrasonic signals). Then, the marking spacing is calculated by combining the belt conveyor speed and the identification time interval between adjacent markings. Finally, the width of the electrode corner area is identified based on the difference in marking spacing. In other embodiments, the markings in contact with the electrode corner area can be differentiated, and the width of the electrode corner area can be identified by identifying these differentiated markings. The specific method is not limited; it can be selected based on actual needs.

[0071] It should be noted that in actual scenarios, when laser etching is performed on a large surface of the electrode, one row of grooves can be etched, or two or more rows of grooves can be etched depending on the width of the electrode or the application requirements. There is no specific limitation.

[0072] Step 304: Determine the cutting position of the single-cell electrode sheet based on the area width.

[0073] Specifically, a single-cell electrode is a segment of an electrode that is wound to form a single cell. The cutting position is the location where the electrode can be cut to obtain a complete single-cell electrode.

[0074] In real-world scenarios, when laser etching or scoring defects are inspected on electrodes, the electrodes are in a conveyor belt state, with large surfaces and corner areas alternating along the conveyor belt direction. For single-cell electrodes, the width of the corner area gradually increases or decreases along the conveyor belt direction. Adjacent single-cell electrodes exhibit the same pattern of corner area width variation, either gradually increasing or decreasing. Figure 2 The figure shows a gradual increase along the direction of the belt.

[0075] Therefore, this embodiment can identify each single-cell electrode in the electrode sheet according to the area width, and then take the contact position of any two adjacent single-cell electrodes as the cutting position.

[0076] Step 306: Mark the single-cell electrode sheet with scoring defects according to the cutting position.

[0077] Specifically, the scratch defects are the defects present in the scratches obtained by laser etching. The types of scratches are not unique, including but not limited to scratches that are too wide or too narrow, or scratches that are too long or too short. There are no specific limitations, and they can be detected by scratch defect detection, which will not be elaborated here.

[0078] Marking refers to marking single-cell electrode sheets with scratches or defects. It is usually done by a marking machine, and can be done by color marking or marking holes, etc. There is no specific limitation.

[0079] In real-world scenarios, after laser etching, each electrode segment used to wind into a single battery cell (i.e., a single-cell electrode) is defined. If a single-cell electrode has a scribe mark defect, the entire single-cell electrode needs to be removed in subsequent processes. Therefore, whether a single-cell electrode has one scribe mark defect or multiple scribe mark defects, it only needs to be marked once.

[0080] The cutting position is used to distinguish the positions of different single-cell electrodes. Therefore, when marking single-cell electrodes with scoring defects, it is only necessary to combine the cutting position to identify the starting position of the single-cell electrode with scoring defects, and then mark it at any position on the single-cell electrode.

[0081] The above-described scheme, where the electrode sheet undergoes laser etching to create surface markings, allows for the identification of the corner area width of the electrode sheet based on these markings. This area width then determines the cutting position of the electrode sheet segment wound to form a single cell. Furthermore, based on the cutting position, single-cell electrode sheets with marking defects can be marked. This scheme also applies to electrode sheets that have not undergone die-cutting, using the surface markings to identify the cutting position of single-cell electrode sheets, providing a basis for marking marking defects. This allows for quality control of the marking process. When single-cell electrode sheets with marking defects are identified, they can be marked according to their respective cells, effectively reducing the possibility of defective products entering subsequent electrode sheet processing.

[0082] Please see Figure 4 In some embodiments, step 302 includes steps 402 and 404.

[0083] Step 402: Image acquisition is performed on the scratches on the electrode surface to obtain scratch image information.

[0084] Step 404: Perform image recognition based on the scratch image information to determine the area width of the electrode corner region.

[0085] Specifically, this embodiment uses the image acquisition and identification of the region width as an example for explanation. The scratch image information is also the electrode image information including the scratch. In some embodiments, considering that the electrode is in a conveyor belt state during processing, that is, in a state of continuous movement, in order to improve the accuracy of image acquisition, a line scan camera + line scan light source can be combined into an image acquisition component. Under the control of the control component, the image acquisition component acquires the scratch image information in real time.

[0086] Furthermore, in one embodiment, the image acquisition component may include a line scan camera; in another embodiment, to improve the accuracy of scratch detection, two cameras may also be configured (see reference). Figure 5 Or two or more line scan cameras, no specific limit is imposed.

[0087] The electrode marking method of this application is executed by a control component. The system used to mark the electrode also includes an image acquisition component and a marking machine. The electrode is carried on a conveyor belt. The image acquisition component and the marking machine are respectively connected to the control component. The control component can receive and analyze the scratch image information, identify the cutting position, and control the marking machine to mark the single-cell electrode with scratch defects according to the received scratch defect detection results.

[0088] It is understood that, in one embodiment, the detection of scratch defects and the marking of electrode sheets are performed simultaneously. After receiving the scratch image information, the control component can also perform identification processing based on the scratch image information to obtain the scratch defect detection result. Finally, based on the cutting position identification result and the scratch defect detection result, the control component controls the marking machine to mark the single-cell electrode sheet with scratch defects.

[0089] It should be noted that the structure of the control component is not unique. In one embodiment, the control component includes an encoder, a host computer, and a PLC (Programmable Logic Controller). See the attached document for details. Figure 6 After the image acquisition component acquires the scratch image information, it generates a frame acquisition completion signal (that is, the signal that each image frame has been acquired) and sends it to the PLC and encoder for processing to obtain the encoder position information. After receiving the frame acquisition completion signal, the PLC stores the encoder position information corresponding to the current image into the designated buffer area.

[0090] After receiving the scratch image information, the host computer uses visual detection algorithms (such as edge detection and template matching) to identify the scratch location in the image. Based on this, it analyzes and calculates the width of the electrode corner area and locates the cutting position within the scratch image (which can be represented by coordinates). This position is then output to the PLC. Finally, based on the scratch defect identification results, the PLC performs a marking operation. Specifically, for single-cell electrode sheets with scratch defects, the marking machine is controlled to mark them using encoder position information and the cutting position. Single-cell electrode sheets without scratch defects do not require marking.

[0091] In a more detailed embodiment, since the image acquisition component is located at the front end of the marking machine, after determining the position corresponding to the single-cell electrode with the scoring defect, it converts it into a pulse signal and sends it to the PIC. The PLC determines the interval pulse based on the distance between the image acquisition component and the marking machine, and finally controls the marking machine to perform the marking operation after the interval pulse, so that the marking position corresponds to the single-cell electrode with the scoring defect.

[0092] The above solution determines the width of the corner area of ​​the electrode by acquiring and recognizing images of the scratches on the electrode surface. It has the advantages of high recognition accuracy and low cost.

[0093] It should be noted that when combining scratch image information for image recognition, multiple scratch images can be stitched together for recognition as needed. The specific choice can be made according to actual needs, and no limitation is made here.

[0094] Please see Figure 7 In some embodiments, step 402 includes steps 702 and 704.

[0095] Step 702: Identify the target scratch based on the scratch image information.

[0096] Step 704: Use the distance between the target grooves as the area width of the electrode corner region.

[0097] Specifically, a target notch represents the notch with the smallest distance to the adjacent corner area within the notch region of the electrode. The notch region is the area on the electrode surface with etched notches, typically the large surface area described above, alternating with the corner areas. In practical scenarios, to facilitate the identification of target notches, they usually need to be differentiated. Correspondingly, the target notch is a notch that has undergone differentiation processing to facilitate the identification of the electrode corner area, which is usually located at the boundary between the corner area and the large surface area. Specifically, differentiation of the target notch can be achieved through color marking, or by configuring the notch to be shorter or longer.

[0098] It is understood that in other embodiments, the target scratches may not be differentiated. After the image acquisition component acquires the scratch image information, the target scratches can also be identified by image recognition technology by combining the differences in the spacing between the scratches. No specific limitation is made.

[0099] For example, in one embodiment, reference may be made to Figure 8 When laser etching the electrode, the markings at the junction of any large surface and the corner area can be configured to be shorter than the other markings (inside the dashed box in the figure). In a real-world scenario, the corner area of ​​the electrode can be quickly located simply by identifying the short markings, and the distance between two short markings can be represented as the width of the corner area of ​​the electrode.

[0100] The above solution differentiates the markings on both sides of the electrode corner area to facilitate identification. By identifying these target markings, the electrode corner area can be accurately located, and the area width can be identified. This method has the advantage of high accuracy in area width identification.

[0101] Please see Figure 9 In some embodiments, step 402 includes steps 902, 904 and 906.

[0102] Step 902: Perform image recognition on the scratch image information to determine the scratch spacing between any adjacent scratches.

[0103] Step 904: Identify the corner area of ​​the electrode based on the groove spacing.

[0104] Step 906: Use the spacing of the grooves corresponding to the corner area of ​​the electrode as the width of the corner area of ​​the electrode.

[0105] Specifically, the notch spacing is the distance between any two adjacent notches on the laser-etched but uncut electrode sheet. It can be adjacent notches within the same large surface area or notches between adjacent large surfaces. In this embodiment, the notch spacing is configured differently; please refer to the relevant documentation. Figure 8 The spacing between adjacent grooves on the same large surface is different from the spacing between grooves on adjacent large surfaces (i.e., d1, d2, etc. in the diagram). Thus, based on the difference in groove spacing, the corner region of the electrode (the region between adjacent large surfaces) can be identified, and the groove spacing between the grooves on both sides of this corner region is taken as the width of the corner region, i.e., d1, d2, etc., all represent the width of the region.

[0106] In some embodiments, the scribe spacing between any adjacent large surfaces can be greater than the scribe spacing between adjacent scribes in the large surface. The scribe spacing between adjacent scribes in the large surface can be uniformly configured or differentially configured, and there is no specific limitation.

[0107] For example, in one embodiment, for a single-cell electrode tab, within each major surface, the distance between adjacent indentations is configured as d, while the distance between the indentation at the outermost edge of one major surface and the indentation at the outermost edge of the next adjacent major surface is configured as d1, d2, d3... dn, and there is d < d1 < d2 < d3 <... < dn. Thus, after identifying the distance between any adjacent indentations, based on the magnitude of the indentation distance, the corner region of the electrode tab and the width of each electrode tab corner region can be located.

[0108] In the above solution, by combining the distances between all indentations and based on the principle that there is a difference between the indentation distance at the corner and the general indentation distance, the identification of the corner region of the electrode tab and the region width is achieved without performing differential processing on the indentations, improving the efficiency of laser etching and the consistency between each indentation.

[0109] In some embodiments, identifying the corner region of the electrode tab based on the indentation distance includes: identifying two indentations corresponding to an indentation distance exceeding a preset standard distance range; and taking the region between the two identified indentations as the corner region of the electrode tab.

[0110] Specifically, the preset standard distance range is the range within which the distances between adjacent indentations in the same indentation region are located within the allowable error range. In the solution of this embodiment, within the same indentation region, each indentation is etched uniformly, while in the corner region of the electrode tab, the indentation distance is the distance between the indentation in the current indentation region and the indentation in the previous indentation region, which will inevitably be different from the indentation distance between the indentations in the same indentation region. Therefore, by identifying the indentation distances that exceed (generally greater than the upper limit value of the preset standard distance range) the preset standard distance range among all the indentation distances, the region where this distance is located is taken as the corner region of the electrode tab.

[0111] In other embodiments, other methods can also be used to identify the corner region of the electrode tab. For example, based on the above principle, taking the difference between adjacent indentation distances. If the difference is taken for the indentation distances in the same indentation region, the difference will inevitably be close to 0, or even 0; if the difference is taken for the indentation distances between adjacent indentation regions, then the difference will inevitably increase, so the corner region of the electrode tab can be identified thereby.

[0112] The above solution directly compares and analyzes the indentation distance with the preset standard distance range, and identifies the region corresponding to the indentation distance that exceeds this range as the corner region of the electrode tab, having the advantages of simple corner region identification method of the electrode tab, high identification efficiency and high identification accuracy.

[0113] Please refer to Figure 10 , in some embodiments, step 304 includes step 1002 and step 1004.

[0114] Step 1002: Determine the last corner area of the current single-cell pole piece and the first corner area of the next single-cell pole piece according to the change between the widths of adjacent areas.

[0115] Step 1004: Determine the cutting position of the current single-cell pole piece according to the last corner area and the first corner area.

[0116] Specifically, as shown in the above embodiment, in the same single-cell pole piece, the width of the pole piece corner area gradually increases or decreases in one direction. When it reaches the maximum or minimum, it enters the next single-cell pole piece, and the width of the next single-cell pole piece increases or decreases according to the same rule. In this way, the boundary between the single-cell pole piece and the next single-cell pole piece can be identified according to the change between the widths of adjacent areas, and this is used as the cutting position of the single-cell pole piece.

[0117] For example, in one embodiment, the widths of the single-cell pole pieces are d1, d2, d3 … dn-1, dn, satisfying d1 < d2 < d3 < … < dn-1 < dn, and adjacent single-cell pole pieces are arranged in the same way in a cycle. If it is detected that the current area width is greater than the previous area width, it means that they are in the same single-cell pole piece; if it is detected that the current area width is less than the previous area width, it means that it is at the boundary position between two single-cell pole pieces, that is, actually at this time: the current area width d1 is less than the previous area width dn. Finally, only by combining the pole piece corner area corresponding to d1 or the pole piece corner area corresponding to dn, the cutting position can be determined.

[0118] Specifically, any position point in the pole piece corner area corresponding to d1 can be used as the cutting position, or any position point in the pole piece corner area corresponding to dn can be used as the cutting position. For example, in one embodiment, the middle position of the pole piece corner area corresponding to d1 is used as the cutting position, or the middle position of the pole piece corner area corresponding to dn is used as the cutting position.

[0119] The above solution, based on the principle that in the process of winding a single wound cell, as the number of winding layers increases, the width of the corner area gradually increases, identifies the cutting position of the single-cell pole piece, and has high accuracy and efficiency in identifying the cutting position.

[0120] Please refer to Figure 11 , in some embodiments, step 306 includes step 112 and step 114.

[0121] Step 112: Determine the marking position according to the cutting position of the single-cell pole piece with a notch defect.

[0122] Step 114: Control the marking machine to mark at the marking position.

[0123] Specifically, after determining the cutting position, any two adjacent cutting positions are a complete single-cell electrode segment. When there are scratches on the single-cell electrode segment, regardless of the number of defects, it is only necessary to mark the electrode segment once.

[0124] For example, in one embodiment, after determining a cutting position, this cutting position can be directly used as the marking position, and subsequent marking can be performed directly at this position. In another embodiment, a position a certain distance from the cutting position can also be used as the marking position, that is, the marking position is located between two adjacent cutting positions.

[0125] The above scheme, after determining the marking position by combining the cutting position, marks the single-cell electrode sheet, thereby achieving accurate calibration of the single-cell electrode sheet with scoring defects and improving the marking accuracy of scoring defects.

[0126] Please see Figure 12 In some embodiments, the method further includes step 122.

[0127] Step 122: According to the cutting position, the die-cutting position of the single cell electrode is calibrated.

[0128] The die-cutting position is used to determine the winding marking hole of the single-cell electrode. The winding marking hole is also the marking hole cut and determined during the die-cutting process, which facilitates the differentiation of the single-cell electrode during the electrode winding process, and is also known as the Mark mark.

[0129] The die-cutting position, in the die-cutting process, is the location used to distinguish the electrode sheet of a single battery cell. In practice, laser etching and die-cutting processes are performed using different equipment and typically cannot communicate directly. The die-cutting position determined by the die-cutting process cannot be sent to the laser etching process, and vice versa. However, theoretically, when processing the same electrode sheet, the positions used to distinguish the electrode sheet of a single battery cell should be consistent.

[0130] Therefore, the solution in this embodiment combines the cutting position determined by the laser etching process to calibrate the die-cutting position of the die-cutting process, so that the cutting position determined by the laser etching process coincides with the die-cutting position of the die-cutting process, thereby improving the consistency of the electrode processing process.

[0131] The above scheme can also be combined with the cutting position to calibrate the die-cutting position of the single cell electrode, improve the consistency between the die-cutting position and the cutting position, and thus improve the accuracy of electrode processing.

[0132] It should be noted that in some embodiments, the operation of calibrating the die-cutting position according to the cutting position and the operation of marking the scoring defects described above can be performed on the same control component or controller; in other embodiments, they can also be performed on different control components or controllers, which is not limited here.

[0133] Please see Figure 13 In some embodiments, step 122 includes steps 132 and 134.

[0134] Step 132: Identify the cut position of the electrode.

[0135] Step 134: The cutting position is used as the die-cutting position of the single-cell electrode sheet.

[0136] In some embodiments, because the devices executing the die-cutting process and the laser etching process cannot communicate, the cutting position needs to be re-identified during the die-cutting process. See also... Figure 14 In this embodiment, an image detector (which can also be a line scan camera + line scan light source structure) is configured at the front end of the die-cutting process. Based on this image detector, and using a similar method as described above, the cutting position can be identified during die-cutting. Then, combining the position of the cutting position in the acquired notch image and the current encoder position stored in the die-cutting machine's PLC, the control component of the die-cutting machine is fed back to the control component. The control component can then determine the die-cutting position of the single-cell electrode sheet. Please refer to [reference needed]. Figure 15 After determining the die-cutting position, a winding mark hole (Mark hole) can be marked on the die-cut electrode sheet based on the die-cutting position. Then, the electrode sheet can be cut from the die-cutting position to obtain a single-cell electrode sheet, which can then be wound into a cell.

[0137] It is understood that, in another embodiment, communication could be established between the execution devices of the die-cutting process and the laser etching process. After the cutting position of the electrode is identified in the laser etching process, it is directly sent to the die-cutting process to calibrate the die-cutting position. In this way, there is no need to configure an image detector in the die-cutting process, reducing hardware costs.

[0138] The above solution directly uses the cutting position as the die-cutting position of the single-cell electrode, so that the die-cutting machine can directly perform electrode die-cutting based on the cutting position, making the die-cutting position coincide with the cutting position, which greatly improves the consistency between the two.

[0139] Please see Figure 16 In some embodiments, step 122 includes steps 152 and 154.

[0140] Step 152: Align the initial die-cutting position with the initial cutting position.

[0141] Step 154: Correct the basic die-cutting position generated by the die-cutting machine according to the cutting position to determine the die-cutting position for a single-cell electrode sheet.

[0142] Specifically, in the solution of the above embodiment, calibrating the die-cutting position through the real-time collected cutting position has relatively high requirements for the timeliness of the hardware. This embodiment provides a solution for feedback correction to determine the die-cutting position. First, align the initial cutting position of the electrode sheet during unwinding before die-cutting with the initial die-cutting position required by the die-cutting machine. This alignment solution can be automatically aligned by an image detector (which can also be a line-scan camera + line-scan light source) at a low speed of the device, or manually aligned by a person, and there is no specific limitation.

[0143] After alignment, in the PLC of the die-cutting machine, set an initial standard position (that is, the alignment position, which can be in pulse numbers or physical distances) for the cutting position and the die-cutting position. At this time, the die-cutting machine can automatically determine the die-cutting position according to the fixed program of the laser (such as determining a die-cutting position at a certain interval). At the same time, through the acquisition result of the image collector, determine the cutting position in the same way as above and transmit it to the PLC. If there is a deviation between the two, it can be adjusted by correction to make the two coincide.

[0144] In the above solution, by aligning the initial position and continuously feedback-correcting during the die-cutting process, the consistency between the die-cutting position and the cutting position is maintained, the requirement for the real-time data transmission is reduced, and it is easy to implement.

[0145] To facilitate understanding of the technical solution of this application, the following will explain this application in combination with a relatively detailed embodiment.

[0146] First, in the laser etching stage, the length of the scratches at the outermost edges of each large surface (that is, both ends in the tape-running direction) is configured to be shorter than the length of the scratches at other positions. After the laser etching is completed, during the winding of the electrode sheet or the detection of scratch defects, collect the scratch image information by the method of a line-scan camera + line-scan light source. The control component identifies the scratch image information, finds the short scratches among them, and takes the area between adjacent short scratches (that is, there are no other scratches between the two) as the corner area of the electrode sheet, and the distance between adjacent short scratches as the area width of the corner area of the electrode sheet. Arrange the respective area widths in the tape-running direction, and for any single-cell electrode sheet, there is d1 < d2 < d3 <... < dn-1 < dn.

[0147] After that, identify the arranged multiple groups of d1 < d2 < d3 <... < dn-1 < dn, find the adjacent d1 and dn, and take the middle position of the corner area corresponding to d1 as the cutting position, or take the middle position of the corner area corresponding to dn as the cutting position.

[0148] During marking, the control component uses the cut position as the marking position. For single-cell electrode sheets with scoring defects, the control component considers the position to be reached by the marking machine after a set pulse, based on the cut position, and controls the marking machine to perform the marking action.

[0149] Furthermore, a similar image acquisition device is configured at the front end of the die-cutting machine to acquire the cutting position in the same way as described above, and the cutting position is sent to the control component of the die-cutting machine. The die-cutting machine uses the cutting position as the die-cutting position to perform subsequent die-cutting operations.

[0150] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0151] Based on the same inventive concept, this application also provides an electrode marking apparatus for implementing the electrode marking method described above. The solution provided by this apparatus is similar to the implementation described in the above method; therefore, the specific limitations in one or more electrode marking apparatus embodiments provided below can be found in the limitations of the electrode marking method described above, and will not be repeated here.

[0152] Please see Figure 17 This application also provides an electrode marking device, including a corner recognition module 162, a cut recognition module 164, and a marking control module 166.

[0153] The corner recognition module 162 is used to identify the width of the corner area of ​​the electrode sheet by combining the scratches on the electrode sheet surface; the cutting recognition module 164 is used to determine the cutting position of the single-cell electrode sheet according to the area width; and the marking control module 166 is used to mark the single-cell electrode sheet with scratch defects according to the cutting position.

[0154] In some embodiments, the corner recognition module 162 is further configured to acquire images of the scratches on the electrode surface to obtain scratch image information; and to perform image recognition based on the scratch image information to determine the area width of the corner region of the electrode.

[0155] In some embodiments, the corner recognition module 162 is further configured to identify the target scratch based on the scratch image information; and to use the distance between the target scratches as the area width of the electrode corner region.

[0156] In some embodiments, the corner recognition module 162 is further configured to perform image recognition on the scratch image information, determine the scratch spacing between any adjacent scratches, identify the electrode corner region based on the scratch spacing, and use the scratch spacing corresponding to the electrode corner region as the region width of the electrode corner region.

[0157] In some embodiments, the cut-off identification module 164 is further configured to determine the cut-off position of a single cell electrode based on the variation between the widths of adjacent regions.

[0158] In some embodiments, the marking control module 166 is further configured to determine the marking position based on the cutting position of the single-cell electrode sheet with the scoring defect, and control the marking machine to perform marking at the marking position.

[0159] In some embodiments, please refer to Figure 18 The device also includes a synchronization marking module 172. The synchronization marking module 172 is used to mark the die-cutting position of the single-cell electrode according to the cutting position.

[0160] In some embodiments, the synchronization marking module 172 is also used to identify the cutting position of the electrode sheet; and to use the cutting position as the die-cutting position of the single-cell electrode sheet.

[0161] In some embodiments, the synchronization marking module 172 is further configured to align the initial die-cutting position with the initial cutting position; correct the basic die-cutting position generated by the die-cutting machine according to the cutting position, and determine the die-cutting position of the single cell electrode sheet.

[0162] Each module in the aforementioned electrode marking device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.

[0163] The aforementioned electrode marking device, when the electrode has undergone laser etching to create grooves on its surface, can identify the width of the corner area of ​​the electrode based on these grooves. This area width is then used to determine the cutting position of the electrode segment wound to form a single cell. Based on the cutting position, single-cell electrode sheets with etching defects can be marked. This solution can also identify the cutting position of single-cell electrode sheets without die-cutting by combining the surface grooves, providing a basis for marking etching defects. This allows for quality control of the etching process. When a single-cell electrode sheet with etching defects is identified, it can be marked according to its corresponding cell, effectively reducing the possibility of defective products entering subsequent electrode processing.

[0164] Please see Figure 19 In some embodiments, this application also provides an electrode marking system, including an image acquisition component 10, a control component 20, and a marking machine 30. The image acquisition component 10 and the marking machine 30 are respectively connected to the control component 20. The image acquisition component 10 is used to acquire images of the electrode after laser etching in order to determine the marking marks on the electrode surface. The control component 20 is used to implement the steps of the above-described electrode marking method.

[0165] Specifically, the electrode marking method is as shown in the above embodiments and accompanying drawings, and will not be repeated here. In this embodiment, after the electrode completes the laser etching process, it is in the conveyor belt process (such as during winding). The image acquisition component 10 is located above the electrode to acquire images of the electrode to obtain the markings on the electrode surface. For details, please refer to [reference needed]. Figure 5 It can be a line scan camera + line scan light source.

[0166] The structure of the control component 20 is not unique; it can be a single controller or a component structure composed of multiple control groups or control parts. No specific limitation is imposed. For example, in one embodiment, see reference [reference needed]. Figure 6 The image acquisition component 10 includes a host computer, an encoder, and a PLC. The encoder, host computer, and PLC are connected to the image acquisition component 10, the encoder and the host computer are connected to the PLC, and the PLC is connected to the marking machine 30. The specific working process will not be described in detail.

[0167] The aforementioned electrode marking system, when electrodes undergo laser etching to create surface markings, can identify the width of the corner area of ​​the electrode by combining these markings with the actual surface markings. This area width is then used to determine the cutting position of the electrode segment wound to form a single cell. Based on the cutting position, single-cell electrodes with marking defects can be marked. This solution can also identify the cutting position of single-cell electrodes without die-cutting by combining the surface markings, providing a basis for marking marking defects. This allows for quality control of the marking process. When single-cell electrodes with marking defects are identified, they can be marked according to their respective cells, effectively reducing the possibility of defective products entering subsequent electrode processing.

[0168] In some embodiments, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 20 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When executed by the processor, the computer program implements a polarimetric marking method.

[0169] Those skilled in the art will understand that Figure 20 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0170] This application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the following method steps:

[0171] By combining the markings on the electrode surface, the width of the corner area of ​​the electrode is identified; based on the area width, the cutting position of the single-cell electrode is determined; based on the cutting position, the single-cell electrode with marking defects is marked.

[0172] In some embodiments, when the processor executes the computer program, it further performs the following steps: acquiring images of the scratches on the surface of the electrode to obtain scratch image information; and performing image recognition based on the scratch image information to determine the area width of the corner region of the electrode.

[0173] In some embodiments, when the processor executes the computer program, it further implements the following steps: identifying the target scratch based on the scratch image information; and using the distance between the target scratches as the area width of the electrode corner region.

[0174] In some embodiments, when the processor executes the computer program, it further implements the following steps: performing image recognition on the scratch image information to determine the scratch spacing between any adjacent scratches; identifying the electrode corner region based on the scratch spacing; and using the scratch spacing corresponding to the electrode corner region as the region width of the electrode corner region.

[0175] In some embodiments, when the processor executes the computer program, it further implements the following steps: determining the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between the widths of adjacent regions; and determining the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

[0176] In some embodiments, when the processor executes the computer program, it further performs the following steps: determining the marking position based on the cutting position of the single-cell electrode sheet with the scoring defect; and controlling the marking machine to mark at the marking position.

[0177] In some embodiments, when the processor executes the computer program, it also performs the following steps: calibrating the die-cutting position of the single-cell electrode according to the cutting position.

[0178] In some embodiments, when the processor executes the computer program, it further performs the following steps: identifying the cutting position of the electrode sheet; and using the cutting position as the die-cutting position of the single-cell electrode sheet.

[0179] In some embodiments, when the processor executes the computer program, it further performs the following steps: aligning the initial die-cutting position with the initial cutting position; correcting the basic die-cutting position generated by the die-cutting machine according to the cutting position, and determining the die-cutting position for the single-cell electrode sheet.

[0180] This application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the following method:

[0181] By combining the markings on the electrode surface, the width of the corner area of ​​the electrode is identified; based on the area width, the cutting position of the single-cell electrode is determined; based on the cutting position, the single-cell electrode with marking defects is marked.

[0182] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: acquiring images of the scratches on the surface of the electrode to obtain scratch image information; and performing image recognition based on the scratch image information to determine the area width of the corner region of the electrode.

[0183] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: identifying the target scratch based on the scratch image information; and using the distance between the target scratches as the area width of the electrode corner region.

[0184] In some embodiments, when the computer program is executed by the processor, it further implements the following steps: performing image recognition on the scratch image information to determine the scratch spacing between any adjacent scratches; identifying the electrode corner region based on the scratch spacing; and using the scratch spacing corresponding to the electrode corner region as the region width of the electrode corner region.

[0185] In some embodiments, when the computer program is executed by the processor, it further implements the following steps: determining the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between the widths of adjacent regions; and determining the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

[0186] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: determining the marking position based on the cutting position of the single-cell electrode sheet with the scoring defect; and controlling the marking machine to mark at the marking position.

[0187] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: calibrating the die-cutting position of the single-cell electrode according to the cutting position.

[0188] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: identifying the cutting position of the electrode sheet; and using the cutting position as the die-cutting position of the single-cell electrode sheet.

[0189] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: aligning the initial die-cutting position with the initial cutting position; correcting the basic die-cutting position generated by the die-cutting machine according to the cutting position, and determining the die-cutting position for the single-cell electrode sheet.

[0190] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the following method steps:

[0191] By combining the markings on the electrode surface, the width of the corner area of ​​the electrode is identified; based on the area width, the cutting position of the single-cell electrode is determined; based on the cutting position, the single-cell electrode with marking defects is marked.

[0192] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: acquiring images of the scratches on the surface of the electrode to obtain scratch image information; and performing image recognition based on the scratch image information to determine the area width of the corner region of the electrode.

[0193] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: identifying the target scratch based on the scratch image information; and using the distance between the target scratches as the area width of the electrode corner region.

[0194] In some embodiments, when the computer program is executed by the processor, it further implements the following steps: performing image recognition on the scratch image information to determine the scratch spacing between any adjacent scratches; identifying the electrode corner region based on the scratch spacing; and using the scratch spacing corresponding to the electrode corner region as the region width of the electrode corner region.

[0195] In some embodiments, when the computer program is executed by the processor, it further implements the following steps: determining the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between the widths of adjacent regions; and determining the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

[0196] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: determining the marking position based on the cutting position of the single-cell electrode sheet with the scoring defect; and controlling the marking machine to mark at the marking position.

[0197] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: calibrating the die-cutting position of the single-cell electrode according to the cutting position.

[0198] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: identifying the cutting position of the electrode sheet; and using the cutting position as the die-cutting position of the single-cell electrode sheet.

[0199] In some embodiments, when the computer program is executed by the processor, it further performs the following steps: aligning the initial die-cutting position with the initial cutting position; correcting the basic die-cutting position generated by the die-cutting machine according to the cutting position, and determining the die-cutting position for the single-cell electrode sheet.

[0200] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0201] In the aforementioned computer equipment, storage media, and computer program products, where the electrode sheets undergo laser etching to create surface markings, the width of the corner area of ​​the electrode sheet can be identified by combining these markings. This area width is then used to determine the cutting position of the electrode sheet segment wound to form a single cell. Furthermore, based on the cutting position, single-cell electrode sheets with marking defects can be marked. This solution also applies to electrode sheets that have not undergone die-cutting, using the surface markings to identify the cutting position of a single-cell electrode sheet, providing a basis for marking marking defects. This allows for quality control of the marking process. When a single-cell electrode sheet with marking defects is identified, it can be marked according to its corresponding single cell, effectively reducing the possibility of defective products entering subsequent electrode sheet processing.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for marking electrodes, characterized in that, The method, applied to electrode sheets that have been marked by laser etching but have not been cut, includes: By combining the markings on the electrode surface, the width of the corner area of ​​the electrode is identified; wherein, the markings are etched on the large surface of the electrode, and the markings are not etched in the corner area of ​​the electrode; The cutting position of the single-cell electrode is determined based on the width of the region; wherein, the single-cell electrode is an electrode segment wound into a single cell. According to the cutting position, the single-cell electrode sheet with scoring defects is marked; The method of identifying the width of the corner region of the electrode by combining the scratches on the electrode surface includes: acquiring images of the scratches on the electrode surface to obtain scratch image information; and performing image recognition based on the scratch image information to determine the width of the corner region of the electrode. The step of performing image recognition based on the scratch image information to determine the region width of the electrode corner area includes: identifying target scratches based on the scratch image information, wherein the target scratches represent the scratches in the scratch region of the electrode that have the smallest distance to the adjacent corner area; and using the distance between the target scratches as the region width of the electrode corner area. Determining the cutting position of a single-cell electrode based on the width of the region includes: determining the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between the widths of adjacent regions; and determining the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

2. The electrode marking method according to claim 1, characterized in that, The step of performing image recognition based on the scratch image information to determine the region width of the electrode corner area further includes: Image recognition is performed on the scratch image information to determine the scratch spacing between any two adjacent scratches; The corner area of ​​the electrode is identified based on the groove spacing; The spacing between the grooves corresponding to the corner area of ​​the electrode is taken as the width of the corner area of ​​the electrode.

3. The electrode marking method according to claim 2, characterized in that, The step of identifying the corner region of the electrode based on the groove spacing includes: Identify two engravings corresponding to the engraving spacing that exceeds the preset standard spacing range; The area between the two identified scratches is designated as the electrode corner area.

4. The electrode marking method according to any one of claims 1-3, characterized in that, The step of marking the single-cell electrode with scoring defects according to the cutting position includes: The marking position is determined based on the cutting position of the single-cell electrode sheet with the scoring defect; The marking machine is controlled to mark at the marking position.

5. The electrode marking method according to any one of claims 1-3, characterized in that, The method further includes: According to the cutting position, the die-cutting position of the single-cell electrode is marked; wherein, the die-cutting position is used to determine the winding mark hole of the single-cell electrode.

6. The electrode marking method according to claim 5, characterized in that, The step of calibrating the die-cutting position of the single-cell electrode sheet according to the cutting position includes: Identify the cut position of the electrode sheet; The cutting position is used as the die-cutting position of the single-cell electrode sheet.

7. The electrode marking method according to claim 5, characterized in that, The step of calibrating the die-cutting position of the single-cell electrode sheet according to the cutting position includes: Align the initial die-cutting position with the initial cutting position; The basic die-cutting position generated by the die-cutting machine is corrected according to the cutting position to determine the die-cutting position of the single cell electrode sheet.

8. An electrode marking device, characterized in that, The device is used for electrodes that have been marked by laser etching but have not been cut. A corner recognition module is used to identify the width of the corner area of ​​the electrode by combining the markings on the electrode surface; wherein the markings are etched on the large surface of the electrode, and the corner area of ​​the electrode is not etched with the markings; The cutting identification module is used to determine the cutting position of the single-cell electrode sheet according to the width of the region; wherein, the single-cell electrode sheet is an electrode sheet segment wound to form a single cell in the electrode sheet; The marking control module is used to mark the single-cell electrode sheet with scoring defects according to the cutting position; The corner recognition module is also used for: acquiring images of the scratches on the surface of the electrode to obtain scratch image information; and performing image recognition based on the scratch image information to determine the area width of the corner region of the electrode. The corner recognition module is further configured to: identify target scratches based on the scratch image information, wherein the target scratches represent the scratches in the scratch region of the electrode sheet that have the smallest distance to the adjacent corner region; and use the distance between the target scratches as the region width of the corner region of the electrode sheet; The cutting identification module is further configured to: determine the last corner region of the current single-cell electrode and the first corner region of the next single-cell electrode based on the change between the widths of adjacent regions; and determine the cutting position of the current single-cell electrode based on the last corner region and the first corner region.

9. An electrode marking system, characterized in that, The device includes an image acquisition component, a control component, and a marking machine. The image acquisition component and the marking machine are respectively connected to the control component. The image acquisition component is used to acquire images of the electrode sheet after laser etching to determine the marking marks on the surface of the electrode sheet. The control component is used to perform the steps of the electrode sheet marking method according to any one of claims 1-7.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the electrode marking method according to any one of claims 1 to 7.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the electrode marking method according to any one of claims 1 to 7.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the electrode marking method according to any one of claims 1 to 7.

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