Electrode die-cutting methods, systems, electronic terminals, and computer-readable storage media

Abstract

This application provides a method, system, electronic terminal, and computer-readable storage medium for die-cutting electrode sheets. The electrode sheet die-cutting method includes acquiring an image of the currently die-cut electrode sheet and performing defect detection on the image. In response to the presence of a defect on the currently die-cut electrode sheet, a corresponding identification tab is determined based on the location information of the defect, the length of a single-cell electrode sheet, and the distance between the die-cutting module and the detection module. The length of a single-cell electrode sheet is determined by a mark die-cut on the currently die-cut electrode sheet. This application, by performing defect detection on the image of the currently die-cut electrode sheet and determining the corresponding identification tab based on the location information of the defect, the length of a single-cell electrode sheet, and the distance between the die-cutting module and the detection module, facilitates the identification of defective electrode sheets and alleviates the waste of electrode sheet material caused by defects.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode die-cutting method, system, electronic terminal, and computer-readable storage medium. Background Technology

[0002] During the production of electrodes used to form battery cells, it is typically necessary to inspect the electrodes for appearance and dimensions. If defects are detected in an electrode, it can be marked for rejection, preventing adverse effects on subsequent cell manufacturing. As the industry develops, the length of the electrode corresponding to a single battery cell (single-cell electrode length) is also increasing. Therefore, even a single defect detected in an electrode can lead to the scrapping of the entire electrode assembly used in the battery cell, resulting in significant waste. Summary of the Invention

[0003] The main technical problem addressed by this application is to provide a method, system, electronic terminal, and computer-readable storage medium for die-cutting electrodes, which can alleviate waste caused by defects in the electrodes.

[0004] In a first aspect, this application provides an electrode die-cutting method, applied to an electrode die-cutting system, the electrode die-cutting system including a die-cutting module and a detection module; the electrode die-cutting method includes:

[0005] Acquire an image of the current die-cut electrode sheet and perform defect detection on the image of the current die-cut electrode sheet;

[0006] In response to the presence of a defect on the current die-cut electrode, the marking tab corresponding to the defect on the current die-cut electrode is determined based on the location information of the defect on the current die-cut electrode, the length of the single cell electrode, and the distance between the die-cutting module and the detection module; the length of the single cell electrode is determined by the markings die-cut on the current die-cut electrode.

[0007] In the technical solution of this application embodiment, defect detection is performed on the image of the current die-cut electrode sheet. When there is a defect in the current die-cut electrode sheet, the identification tab corresponding to the defect of the current die-cut electrode sheet is determined based on the location information of the defect on the current die-cut electrode sheet, the length of the single cell electrode sheet, and the distance between the die-cutting module and the detection module. This allows the current die-cut electrode sheet to be marked as defective, thus eliminating the need to add other equipment to mark defective products. This helps to alleviate the waste of electrode sheet material caused by defects in the electrode sheet by using the identification tab.

[0008] In some embodiments, the detection module includes a first detection unit and a second detection unit, wherein the first detection unit is disposed upstream of the die-cutting module and the second detection unit is disposed downstream of the die-cutting module;

[0009] Defect detection is performed on the image of the current die-cut electrode sheet, including:

[0010] Before die-cutting the first tab on the edge of the current die-cut electrode sheet, the first detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain the first detection result;

[0011] After die-cutting the first tab on the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain a second detection result.

[0012] In the technical solution of this application embodiment, image acquisition and defect detection are performed on the current die-cut electrode sheet before and after die-cutting the first electrode tab. By performing defect detection on the current die-cut electrode sheet in different processes, the detection accuracy of the current die-cut electrode sheet is improved and the waste of electrode sheet material caused by defects is reduced.

[0013] In some embodiments, the current die-cut electrode sheet includes a metal current collector and a plurality of sequentially stacked electrode coatings formed on at least one surface of the metal current collector;

[0014] The first detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image to obtain a first detection result, including:

[0015] At least one surface image of each electrode coating is acquired by the first detection unit;

[0016] Defect detection was performed on the surface images of each electrode coating to obtain the first detection result.

[0017] In the technical solution of this application embodiment, by performing image acquisition and defect detection on the surface of each electrode coating in the current die-cut electrode sheet, the surface of each electrode coating is detected separately, so as to detect surface defects of the inner electrode coating, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode sheet material caused by defects.

[0018] In some embodiments, the second detection result includes the electrode detection result;

[0019] After die-cutting the first tab at the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image to obtain a second detection result, including:

[0020] After die-cutting the first tab on the edge of the current die-cut electrode sheet, the second detection unit acquires an image of one surface of the current die-cut electrode sheet to obtain the first image;

[0021] Defect detection is performed on the first electrode tab in the first image to obtain the electrode tab detection result.

[0022] In the technical solution of this application embodiment, the surface of the current die-cut electrode sheet is image acquired and electrode tab defects are detected by the second detection unit, so as to detect the first electrode tab of the current die-cut electrode sheet, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode sheet material caused by defects.

[0023] In some embodiments, the second detection result includes the segmentation detection result;

[0024] After die-cutting the first tab at the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image to obtain a second detection result, including:

[0025] After die-cutting the first tab at the edge of the current die-cut electrode sheet, the current die-cut electrode sheet is divided into two electrode material regions along the extension slitting line of the current die-cut electrode sheet in the first direction;

[0026] The second detection unit acquires an image of the surface of the electrode material region formed by the current die-cut electrode to obtain a second image.

[0027] The polar material region in the second image is detected to obtain the segmentation detection result.

[0028] In the technical solution of this application embodiment, the second detection unit performs image acquisition and defect detection on the electrode material area formed by the current die-cut electrode sheet, so as to detect the cutting detection result of the current die-cut electrode sheet, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode material caused by defects.

[0029] In some embodiments, the second detection result also includes the electrode detection result;

[0030] Before the step of dividing the current die-cut electrode into two electrode material regions along the extending cleaving line of the current die-cut electrode in the first direction, the method further includes:

[0031] After die-cutting the first tab on the edge of the current die-cut electrode sheet, an image is acquired on one surface of the current die-cut electrode sheet to obtain the first image;

[0032] Defect detection is performed on the first electrode tab in the first image to obtain the electrode tab detection result.

[0033] In the technical solution of this application embodiment, image detection and electrode defect detection are performed on the first electrode tab on the current die-cut electrode sheet to facilitate the detection of the first electrode tab of the current die-cut electrode sheet. By performing defect detection on the current die-cut electrode sheet in different processes, the detection accuracy of the current die-cut electrode sheet is improved and the waste of electrode sheet material caused by defects is reduced.

[0034] In some embodiments, in response to a defect on the current die-cut electrode sheet, an identification tab corresponding to the defect on the current die-cut electrode sheet is determined based on the location information of the defect on the current die-cut electrode sheet, the length of the single-cell electrode sheet, and the distance between the die-cutting module and the detection module, including:

[0035] In response to the presence of a defect in the current die-cut electrode sheet in either the first or second detection result, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet.

[0036] In the technical solution of this application embodiment, when there is a defect on the current die-cut electrode sheet, the marking tab corresponding to the defect of the current die-cut electrode sheet is determined according to the distance between the single cell electrode sheet length and the die-cutting module and the second detection unit. By marking the current die-cut electrode sheet, the die-cut electrode sheet with defects can be removed.

[0037] In some embodiments, the current die-cut electrode includes the i-th single-cell electrode; i is a positive integer;

[0038] In response to a defect in the current die-cut electrode sheet as determined by the first or second detection result, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including:

[0039] In response to the first detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module and the second detection unit, the first identification tab is die-cut on the i-th single cell electrode.

[0040] In the technical solution of this application embodiment, when a defect is detected in the i-th single-cell electrode before the first tab is die-cut out from the edge of the i-th single-cell electrode, the electrode length of the i-th single-cell electrode is not less than the distance between the die-cutting module and the second detection unit. The first marking tab is die-cut out on the i-th single-cell electrode to mark the i-th single-cell electrode as having a defect, which helps to remove the single-cell electrode with the defect.

[0041] In some embodiments, the electrode die-cutting method includes:

[0042] Based on the location information of the defect on the i-th single cell electrode in the first detection result, the die-cutting position of the mark on the (i+1)-th single cell electrode is determined.

[0043] In the technical solution of this application embodiment, the die-cutting position of the mark of the (i+1)th single-cell electrode is determined based on the position of the defect surface on the i-th single-cell electrode, thereby reducing the waste of electrode material caused by defects.

[0044] In some embodiments, based on the location information of the defect on the i-th single-cell electrode in the first detection result, the die-cutting position of the mark on the (i+1)-th single-cell electrode is determined, including:

[0045] The distance between the current die-cutting position and the preset position on the i-th single-cell electrode sheet in the first direction is determined as the first distance; the distance between the defect and the preset position on the i-th single-cell electrode sheet in the first direction is determined as the second distance, where the first direction is the moving direction of the current die-cut electrode sheet; and the preset position is the starting position of the single-cell electrode sheet.

[0046] In response to the first distance being not less than the second distance, a mark is die-cut at the current die-cut position on the i-th single cell electrode.

[0047] In the technical solution of this application embodiment, when there is a defect on the i-th single cell electrode sheet and the position of the defect surface is downstream of the current die-cutting position, a mark is die-cut at the current die-cutting position on the i-th single cell electrode sheet to form the next single cell electrode sheet, which can reduce the waste of electrode sheet material caused by defects.

[0048] In some embodiments, the current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer;

[0049] In response to a defect in the current die-cut electrode sheet as determined by the first or second detection result, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including:

[0050] In response to the first detection result that the i-th single cell electrode has a defect and the distance between the die-cutting module and the second detection unit is greater than the length of the single cell electrode but less than twice the length of the single cell electrode, the i-th single cell electrode is continued to be die-cut and the second identification tab is die-cut on the (i+1)-th single cell electrode.

[0051] In the technical solution of this application embodiment, a defect is detected in the i-th single-cell electrode before the first tab is die-cut out at the edge of the i-th single-cell electrode. The distance between the die-cutting module and the second detection unit is greater than the length of the single-cell electrode but less than twice the length of the single-cell electrode. A second marking tab is die-cut out on the (i+1)-th single-cell electrode after the current die-cut electrode to mark the i-th single-cell electrode as defective, which helps to remove the die-cut electrode with defects.

[0052] In some embodiments, the current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer;

[0053] In response to a defect in the current die-cut electrode sheet as determined by the first or second detection result, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including:

[0054] In response to the second detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module and the second detection unit, the i-th single cell electrode is continued to be die-cut and the second identification tab is die-cut on the (i+1)-th single cell electrode.

[0055] In the technical solution of this application embodiment, after the first tab is die-cut out of the edge of the i-th single cell electrode sheet, a defect is detected in the i-th single cell electrode sheet. The length of the single cell electrode sheet is not less than the distance between the die-cutting module and the second detection unit. A second marking tab is die-cut out on the (i+1)-th single cell electrode sheet to mark the defect in the current die-cut electrode sheet, which helps to remove the die-cut electrode sheet with defects.

[0056] In some embodiments, the current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer;

[0057] In response to a defect in the current die-cut electrode sheet as determined by the first or second detection result, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including:

[0058] In response to the second detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is less than the distance between the die-cutting module and the second detection unit, the identification tab corresponding to the defect of the i-th single cell electrode is determined based on the defect detection result of the (i+1)-th single cell electrode.

[0059] In the technical solution of this application embodiment, after the first tab is die-cut from the edge of the i-th single-cell electrode sheet, a defect is detected in the i-th single-cell electrode sheet. When the length of the single-cell electrode sheet is less than the distance between the die-cutting module and the second detection unit, the marking tab corresponding to the defect of the i-th single-cell electrode sheet is determined according to the defect detection result of the (i+1)-th single-cell electrode sheet. This saves the number of die-cutting times for defect marking and helps to remove die-cut electrode sheets with defects.

[0060] In some embodiments, the current die-cut electrode sheet further includes the (i+2)th single-cell electrode sheet;

[0061] Based on the defect detection results of the (i+1)th single-cell electrode, the identification tab corresponding to the defect of the ith single-cell electrode is determined, including:

[0062] In response to the defect in the (i+1)th single cell electrode, the (i+1)th single cell electrode is die-cut and the third identification tab is die-cut on the (i+2)th single cell electrode.

[0063] And / or, in response to the absence of defects in the (i+1)th single cell electrode, continue die-cutting the (i+1)th single cell electrode and die-cut the fourth identification tab on the (i+2)th single cell electrode.

[0064] In the technical solution of this application embodiment, when there is a defect in the i-th single cell electrode, the identification tab corresponding to the defect of the i-th single cell electrode is determined according to the defect detection result of the (i+1)-th single cell electrode, thereby reducing the number of die-cutting times for the defect identification.

[0065] In some embodiments, the current die-cut electrode sheet includes a continuous i-th single-cell electrode sheet, an (i+1)-th single-cell electrode sheet, and an (i+2)-th single-cell electrode sheet, and the electrode sheet die-cutting method further includes:

[0066] The i-th single-cell electrode, the (i+1)-th single-cell electrode, and the (i+2)-th single-cell electrode that have been die-cut are wound along the second direction;

[0067] The (i+2)th, (i+1)th, and (i)th single-cell electrode sheets are sequentially unwound along a third direction, and defective single-cell electrode sheets are removed based on the marking tabs on the single-cell electrode sheets; the third direction is opposite to the second direction.

[0068] In the technical solution of this application embodiment, the i-th single-cell electrode, the (i+1)-th single-cell electrode, and the (i+2)-th single-cell electrode are sequentially wound and unwound to determine the single-cell electrode that needs to be rejected based on the marking tabs on the single-cell electrode, so as to remove the defective single-cell electrode based on the marking tabs.

[0069] Secondly, this application provides an electrode sheet, which is obtained by the electrode sheet die-cutting method as described in the first aspect; the edge of the electrode sheet has a first electrode tab and / or an identification electrode tab.

[0070] Thirdly, this application provides an electrode die-cutting system, comprising:

[0071] The die-cutting module is used to die-cut the current die-cut electrode sheet and to die-cut the first electrode tab and the marking electrode tab on the edge of the current die-cut electrode sheet; the first electrode tab is different from the marking electrode tab;

[0072] The detection module is used to perform defect detection on the image of the current die-cut electrode sheet;

[0073] The controller communicates with the detection module and the die-cutting module. In response to the presence of a defect on the current die-cutting electrode, the controller determines the marking tab corresponding to the defect on the current die-cutting electrode based on the location information of the defect on the current die-cutting electrode, the length of the single cell electrode, and the distance between the die-cutting module and the detection module. The length of the single cell electrode is determined by the markings die-cut on the current die-cutting electrode.

[0074] Fourthly, this application provides an electronic terminal, which includes a memory and a processor coupled to each other. The processor is used to execute program instructions stored in the memory and to execute program data to implement the steps in the electrode die-cutting method of the first aspect.

[0075] Fifthly, this application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the electrode die-cutting method of the first aspect.

[0076] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0077] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0078] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0079] Figure 1 This is a schematic diagram of an embodiment of the electrode die-cutting system provided in this application;

[0080] Figure 2 This is a schematic diagram of the structure of an embodiment of the electrode die-cutting system and electrode material provided in this application;

[0081] Figure 3 This is a schematic diagram of the first marking tab in one embodiment of the die-cut electrode sheet provided in this application;

[0082] Figure 4 This is a schematic diagram of the second marking tab in one embodiment of the die-cut electrode sheet provided in this application;

[0083] Figure 5This is a schematic diagram of the third identification tab in one embodiment of the die-cut electrode sheet provided in this application;

[0084] Figure 6 This is a schematic diagram of the fourth identification tab in one embodiment of the die-cut electrode sheet provided in this application;

[0085] Figure 7 This is a schematic flowchart of an embodiment of the electrode die-cutting method provided in this application;

[0086] Figure 8 yes Figure 7 A flowchart illustrating a specific embodiment of step S1 in the provided electrode die-cutting method;

[0087] Figure 9 This is a schematic diagram of the structure of a specific embodiment of the electrode material provided in this application;

[0088] Figure 10 This is a schematic diagram of the framework of an embodiment of the electronic terminal provided in this application;

[0089] Figure 11 This is a schematic diagram of a framework of an embodiment of the computer-readable storage medium provided in this application.

[0090] In the figure: electrode die-cutting system 100; detection module 1; first detection unit 11; second detection unit 12; electrode tab detection unit 13; slitting detection unit 14; die-cutting module 2; controller 3; slitting module 4; electrode material 5; coating area 51; empty foil area 52; electrode material area 53; mark hole 54; first electrode tab 55; marking electrode tab 56; first marking electrode tab 561; second marking electrode tab 562; third marking electrode tab 563; fourth marking electrode tab 564; defective surface 57; defective electrode tab 58. Detailed Implementation

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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).

[0097] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0098] 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.

[0099] Currently, judging from market trends, the application of power batteries (such as lithium batteries) is becoming increasingly widespread. Power batteries are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in specialized equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0100] Whether using winding or stacking processes to produce battery cells, the electrodes used in the cells must be inspected for appearance and dimensions beforehand. If defects are detected in an electrode, it can be marked so that subsequent processing equipment can identify and reject defective products before they are made into cells, avoiding adverse effects on cell production. As the industry develops, consumers' demands for battery range are increasing. To meet these requirements, and with the optimization of processes, the length of the electrode corresponding to a single cell (i.e., the length of the electrode per cell, or the EA length) is also increasing, for example, from about five meters initially to about thirty meters now. At the same time, to ensure battery safety, if a defect is detected in an electrode, even just a single defect, it may be necessary to scrap the entire electrode of EA length, which can easily lead to significant waste.

[0101] To alleviate the waste caused by defects in the electrode sheets, this embodiment can use a detection module to acquire surface images and detect defects in the current die-cut electrode sheet. When a defect exists in the current die-cut electrode sheet, the corresponding marking tab is determined based on the location information of the defect, the length of the single-cell electrode sheet, and the distance between the die-cutting module and the detection module. This allows for the marking of the current die-cut electrode sheet as a defective product, eliminating the need for additional equipment to mark defective products. This saves materials, reduces production costs, and improves production efficiency.

[0102] Therefore, this application proposes an electrode die-cutting system and method.

[0103] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of an embodiment of the electrode die-cutting system provided in this application; Figure 2 This is a schematic diagram of an embodiment of the electrode die-cutting system and electrode material provided in this application.

[0104] This embodiment provides an electrode die-cutting system 100, which includes a detection module 1, a die-cutting module 2, and a controller 3. The controller 3 is communicatively connected to the detection module 1 and the die-cutting module 2.

[0105] The die-cutting module 2 is used to die-cut the electrode material 5 to cut out a first tab 55 and a marking tab 56 on the edge of the electrode material 5; the first tab 55 is different from the marking tab 56. The electrode material 5 is used as the currently die-cut electrode.

[0106] The detection module 1 is used to perform defect detection on the image of the current die-cut electrode sheet.

[0107] The controller 3 is used to respond to the presence of a defect on the current die-cut electrode sheet by determining the identification tab 56 corresponding to the defect on the current die-cut electrode sheet based on the location information of the defect on the current die-cut electrode sheet, the length of the single cell electrode sheet, and the distance between the die-cutting module 2 and the detection module 1; the length of the single cell electrode sheet is determined by the mark die-cut on the current die-cut electrode sheet.

[0108] In the technical solution of this application embodiment, the detection module 1 performs defect detection on the current die-cut electrode sheet. When the current die-cut electrode sheet has a defect, the controller 3 is used to determine the identification tab 56 corresponding to the defect of the current die-cut electrode sheet based on the location information of the defect on the current die-cut electrode sheet, the length of the single cell electrode sheet, and the distance between the die-cutting module 2 and the detection module 1, so as to mark the current die-cut electrode sheet as a defective product, thereby eliminating the need to add other equipment to mark defective products.

[0109] Specifically, the detection module 1 includes a first detection unit 11 and a second detection unit 12. The first detection unit 11 is located upstream of the die-cutting module 2, and the second detection unit 12 is located downstream of the die-cutting module 2. There can be one or more first detection units 11, depending on the specific circumstances. Similarly, there can be one or more second detection units 12, depending on the specific circumstances.

[0110] In some embodiments, before die-cutting the first tab 55 on the edge of the current die-cut electrode sheet, the first detection unit 11 is used to acquire a surface image of the current die-cut electrode sheet and perform defect detection on the surface image of the current die-cut electrode sheet to obtain a first detection result.

[0111] In some specific embodiments, the electrode material 5 includes a metal current collector and a plurality of sequentially stacked electrode coatings formed on at least one surface of the metal current collector. The electrode material 5 has two surfaces arranged opposite to each other, and at least one surface of the electrode material 5 has a coating region 51 and empty foil regions 52 located at the two sides of the coating region 51. The electrode coatings are located in the coating region 51 of the electrode material 5.

[0112] The first detection unit 11 is used to acquire surface images of at least each electrode coating; perform defect detection on the surface images of each electrode coating to obtain a first detection result. The first detection result is either defective or acceptable. In response to the first detection result being a defect, the first detection result also includes the location information of the defective surface 57.

[0113] In some embodiments, after the first tab 55 is die-cut on the edge of the current die-cut electrode sheet, the second detection unit 12 is used to acquire an image of the current die-cut electrode sheet and perform defect detection on the image of the current die-cut electrode sheet to obtain a second detection result.

[0114] In some specific embodiments, the second detection result includes only the electrode detection result.

[0115] Specifically, after die-cutting the first tab 55 on the edge of the current die-cut electrode sheet, the tab detection unit 13 acquires an image of a surface of the current die-cut electrode sheet to obtain a first image; performs defect detection on the first tab 55 in the first image to obtain a tab detection result. The tab detection unit 13 serves as the second detection unit 12. The second detection result is either defective or acceptable. In response to the second detection result being defective, the second detection result also includes the location information of the defective tab 58.

[0116] In some specific embodiments, the second detection result only includes the slitting detection result. The electrode die-cutting system 100 further includes a slitting module 4, which is communicatively connected to the controller 3 and is positioned between the die-cutting module 2 and the second detection unit 12.

[0117] Specifically, the slitting module 4 is used to slit the current die-cut electrode sheet into two electrode material regions 53 along the extending slitting line of the current die-cut electrode sheet in the first direction after die-cutting the first electrode tab 55 at the edge of the current die-cut electrode sheet. The slitting detection unit 14 is used to acquire an image of the surface of the electrode material region 53 formed by the current die-cut electrode sheet to obtain a second image; and to detect the electrode material region 53 in the second image to obtain a slitting detection result. The slitting detection unit 14 serves as the second detection unit 12. The second detection result is either defective or acceptable. In response to the second detection result being defective, the second detection result also includes the location information of the defective region.

[0118] In one embodiment, the second detection result includes the tab detection result and the slitting detection result. The electrode die-cutting system 100 includes a slitting module 4, a tab detection unit 13, and a slitting detection unit 14. The tab detection unit 13, the slitting module 4, and the slitting detection unit 14 are sequentially distributed downstream of the die-cutting module 2.

[0119] The tab detection unit 13 is used to acquire an image of a surface of the current die-cut electrode after the first tab 55 is die-cut on the edge of the current die-cut electrode to obtain a first image; and to perform defect detection on the first tab 55 in the first image to obtain the tab detection result.

[0120] The slitting module 4 is used to slit the current die-cut electrode into two electrode material regions 53 along the extending slitting line of the current die-cut electrode in the first direction after the first electrode tab 55 is die-cut on the edge of the current die-cut electrode.

[0121] The slitting detection unit 14 is used to acquire an image of the surface of the electrode material region 53 formed by the current die-cut electrode sheet, thereby obtaining a second image; and to detect the electrode material region 53 in the second image, thereby obtaining a slitting detection result. The slitting detection unit 14 serves as the second detection unit 12. The second detection result is either defective or acceptable. In response to a defective second detection result, the second detection result also includes the location information of the defective electrode tab 58 and / or the defective region.

[0122] Specifically, there can be one or two die-cutting modules 2. When there is one die-cutting module 2, it can be located on one side of the electrode material 5, and the die-cutting module 2 cuts one side of the electrode material 5 to form a single-sided electrode material 5. When there are two die-cutting modules 2, they are located on opposite sides of the electrode material 5, and the two die-cutting modules 2 cut both sides of the electrode material 5 to form a double-sided electrode material 5. The two die-cutting modules 2 can be symmetrically arranged on both sides of the electrode material 5, or they can be staggered on both sides of the electrode material 5. The die-cutting module 2 can be a laser.

[0123] In some embodiments, the controller 3, in response to a first detection result or a second detection result indicating a defect in the current die-cut electrode sheet, compares the length of a single-cell electrode sheet with the distance between the die-cutting module 2 and the second detection unit 12 to determine an identification tab 56 corresponding to the defect in the current die-cut electrode sheet. The length of the single-cell electrode sheet is denoted as L1, and the distance between the die-cutting module 2 and the second detection unit 12 is denoted as L2.

[0124] Please see Figure 3 , Figure 3 This is a schematic diagram of the first marking tab in one embodiment of the die-cut electrode sheet provided in this application.

[0125] In some embodiments, the controller 3 is used to die-cut a first identification tab 561 on the i-th single cell electrode in response to the first detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module 2 and the second detection unit 12, i.e., L1≥L2.

[0126] In some specific embodiments, the controller 3 is used to determine the die-cutting position of the mark on the (i+1)th single-cell electrode based on the position information of the defect on the i-th single-cell electrode in the first detection result. Specifically, the controller 3 is used to determine the distance in a first direction between the current die-cutting position and a preset position on the i-th single-cell electrode as a first distance; and to determine the distance in a first direction between the defect surface 57 and the preset position on the i-th single-cell electrode as a second distance, where the first direction is the moving direction of the electrode material 5; and the preset position is the starting position of the i-th single-cell electrode. Specifically, the die-cutting module 2 is used to die-cut a mark hole 54 at the starting position of each electrode as the starting position. The mark hole 54 serves as a marker to determine the length of the single-cell electrode. The distance between two adjacent mark holes 54 is the length of the single-cell electrode.

[0127] In response to the first distance being not less than the second distance, a mark is die-cut at the current die-cut position on the current die-cut electrode.

[0128] Please see Figure 4 , Figure 4 This is a schematic diagram of the second marking tab in one embodiment of the die-cut electrode sheet provided in this application.

[0129] Wherein, the current die-cut electrode is the i-th single-cell electrode; i is a positive integer.

[0130] In some embodiments, the controller 3 is configured to respond to the first detection result that the i-th single cell electrode has a defect and the distance between the die-cutting module 2 and the second detection unit 12 is greater than the length of the single cell electrode but less than twice the length of the single cell electrode, i.e., L1 < L2 < 2 * L1, then continue to die-cut the i-th single cell electrode and die-cut the second identification tab 562 on the (i+1)-th single cell electrode.

[0131] In some embodiments, the controller 3 is configured to respond to the second detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module 2 and the second detection unit 12, i.e., L1≥L2, then continue to die-cut the i-th single cell electrode and die-cut the second identification tab 562 on the (i+1)-th single cell electrode.

[0132] In some embodiments, the controller 3 is configured to determine the identification tab 56 corresponding to the defect of the i-th single cell electrode based on the defect detection result of the (i+1)-th single cell electrode, in response to the second detection result indicating that the i-th single cell electrode has a defect and the length of the single cell electrode is less than the distance between the die-cutting module 2 and the second detection unit 12, i.e., L1 < L2.

[0133] Please see Figure 5 , Figure 5 This is a schematic diagram of the third identification tab in one embodiment of the die-cut electrode sheet provided in this application.

[0134] In some embodiments, the controller 3 is configured to continue die-cutting the (i+1)th single-cell electrode and die-cut a third identification tab 563 on the (i+2)th single-cell electrode in response to a defect in the (i+1)th single-cell electrode.

[0135] Please see Figure 6 , Figure 6 This is a schematic diagram of the fourth identification tab in one embodiment of the die-cut electrode sheet provided in this application.

[0136] In some embodiments, the controller 3 is configured to continue die-cutting the (i+1)th single-cell electrode and die-cut out the fourth identification tab 564 on the (i+2)th single-cell electrode in response to the absence of defects in the (i+1)th single-cell electrode.

[0137] In this embodiment, the first detection unit 11, the tab detection unit 13, and the slitting detection unit 14 can be charge-coupled device (CCD) cameras.

[0138] In one embodiment, the electrode die-cutting system 100 further includes a slitting and correction module, which is located upstream of the slitting module 4. The slitting and correction module is used to adjust the position of the electrode material 5 based on the axis of symmetry and the position information of the axis of symmetry; the direction of the axis of symmetry is parallel to the direction of movement of the electrode material 5.

[0139] In the technical solution of this application embodiment, the position of the electrode material 5 is adjusted based on the position information of the symmetry axis of the electrode material 5 by detecting the position of the symmetry axis of the electrode material 5 in the first image, thereby realizing the cutting correction of the electrode material 5 and improving the cutting accuracy of the electrode material 5.

[0140] In some embodiments, the electrode die-cutting system 100 further includes a die-cutting correction module, which is located upstream of the die-cutting module 2. The die-cutting correction module is used to adjust the position of the electrode material 5 based on the width of the empty foil area 52 on the electrode material 5.

[0141] In the technical solution of this application embodiment, the die-cutting of the electrode material 5 is corrected by detecting the position information and size information of the hollow foil area 52 in the surface image of the electrode material 5, thereby improving the die-cutting accuracy of the electrode.

[0142] Please see Figure 7 , Figure 7 This is a schematic flowchart of an embodiment of the electrode die-cutting method provided in this application.

[0143] This embodiment provides a method for die-cutting electrodes, specifically using the electrode die-cutting system 100 described in the above embodiment to produce electrodes. The electrode die-cutting method includes the following steps.

[0144] S1: Obtain the image of the current die-cut electrode sheet and perform defect detection on the image of the current die-cut electrode sheet.

[0145] S2: In response to the presence of a defect on the current die-cut electrode, the marking tab corresponding to the defect on the current die-cut electrode is determined based on the location information of the defect on the current die-cut electrode, the length of the single cell electrode, and the distance between the die-cutting module and the detection module; the length of the single cell electrode is determined by the markings die-cut on the current die-cut electrode.

[0146] In the technical solution of this application embodiment, defect detection is performed on the image of the current die-cut electrode sheet. When there is a defect in the current die-cut electrode sheet, the identification tab corresponding to the defect of the current die-cut electrode sheet is determined based on the location information of the defect on the current die-cut electrode sheet, the length of the single cell electrode sheet, and the distance between the die-cutting module and the detection module. This allows the current die-cut electrode sheet to be marked as defective, thus eliminating the need to add other equipment to mark defective products. This helps to alleviate the waste of electrode sheet material caused by defects in the electrode sheet by using the identification tab.

[0147] Please see Figure 8 , Figure 8 yes Figure 7 A flowchart illustrating a specific embodiment of step S1 in the provided electrode die-cutting method.

[0148] Specifically, the step of performing defect detection on the image of the current die-cut electrode sheet in step S1 includes the following implementation methods.

[0149] S11: Before die-cutting the first tab on the edge of the current die-cut electrode sheet, the first detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain the first detection result.

[0150] S12: After die-cutting the first tab on the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain a second detection result.

[0151] In the technical solution of this application embodiment, image acquisition and defect detection are performed on the current die-cut electrode sheet before and after die-cutting the first electrode tab. By performing defect detection on the current die-cut electrode sheet in different processes, the detection accuracy of the current die-cut electrode sheet is improved and the waste of electrode sheet material caused by defects is reduced.

[0152] In some embodiments, the electrode material includes a metal current collector and a plurality of sequentially stacked electrode coatings formed on at least one surface of the metal current collector. Step S11 specifically includes the following implementation.

[0153] The first detection unit acquires surface images of at least each electrode coating; defect detection is performed on the surface images of each electrode coating to obtain a first detection result. The defect detection may include at least one of size detection, shape detection, scratch detection, foreign object detection, and wrinkle detection. The first detection result is either defective or acceptable. In response to a defective first detection result, the first detection result also includes the location information of the defective surface.

[0154] In the technical solution of this application embodiment, by performing image acquisition and defect detection on the surface of each electrode coating in the current die-cut electrode sheet, the surface of each electrode coating is detected separately, so as to detect surface defects of the inner electrode coating, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode sheet material caused by defects.

[0155] After the first detection unit performs image acquisition and defect detection on the electrode coating on the current die-cut electrode sheet, the die-cutting module die-cuts a starting mark at the starting position of the current die-cut electrode sheet and die-cuts a first electrode tab at the edge of the current die-cut electrode sheet. Specifically, the die-cutting module die-cuts a mark hole at the starting position of each electrode sheet as a starting identifier.

[0156] The die-cut electrode sheets can be full-tab electrode sheets, equally spaced tab electrode sheets, or gradually spaced tab electrode sheets. In a full-tab electrode sheet, all edges of the electrode sheet are set as tabs; in an equally spaced tab electrode sheet, the spacing between adjacent first tabs on the side of the electrode sheet is equal; in a gradually spaced tab electrode sheet, the spacing between adjacent first tabs on the side of the electrode sheet is unequal. Specifically, in a gradually spaced tab electrode sheet, the spacing between adjacent first tabs on the side of the electrode sheet gradually increases or decreases.

[0157] In some embodiments, the second detection unit is a tab detection unit.

[0158] Step S12 specifically includes the following implementation: After die-cutting the first tab on the edge of the current die-cut electrode sheet, an image is acquired from a surface of the current die-cut electrode sheet by the tab detection unit to obtain a first image; a tab defect detection is performed on the first tab in the first image to obtain a tab detection result. The second detection result is either defective or qualified. In response to the second detection result being defective, the second detection result also includes the location information of the defective tab.

[0159] In the technical solution of this application embodiment, the surface of the current die-cut electrode sheet is image acquired and electrode tab defects are detected by the second detection unit, so as to detect the first electrode tab of the current die-cut electrode sheet, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode sheet material caused by defects.

[0160] In some embodiments, the second detection unit is a slitting detection unit; the second detection result includes the slitting detection result.

[0161] Step S12 specifically includes the following implementation: After die-cutting the first tab at the edge of the current die-cut electrode sheet, the current die-cut electrode sheet is divided into two electrode material regions along the extending slitting line in the first direction; an image is acquired of the surface of the electrode material region formed by the current die-cut electrode sheet through a slitting detection unit to obtain a second image; the electrode material region in the second image is detected to obtain a slitting detection result. The second detection result is either defective or acceptable. In response to the second detection result being a defect, the second detection result also includes the location information of the defective region.

[0162] In the technical solution of this application embodiment, the second detection unit performs image acquisition and defect detection on the electrode material area formed by the current die-cut electrode sheet, so as to detect the cutting detection result of the current die-cut electrode sheet, improve the detection accuracy of the current die-cut electrode sheet, and reduce the waste of electrode material caused by defects.

[0163] In some embodiments, the second detection result includes the tab detection result and the slitting detection result.

[0164] Step S12 specifically includes the following implementation: After die-cutting the first tab at the edge of the current die-cut electrode sheet, an image is acquired from a surface of the current die-cut electrode sheet by a tab detection unit to obtain a first image; a tab defect detection is performed on the first tab in the first image to obtain a tab detection result. The current die-cut electrode sheet is divided into two electrode material regions by a slitting module along the extending slitting line in the first direction; an image is acquired from the surface of the electrode material region formed by the current die-cut electrode sheet by a slitting detection unit to obtain a second image; the electrode material region in the second image is detected to obtain a slitting detection result. The detection accuracy of the current die-cut electrode sheet is improved by combining the tab detection result and the slitting detection result. To improve the detection accuracy of the current die-cut electrode sheet, the position information of the downstream slitting detection unit is used as the position information of the second detection unit, so as to determine the distance between the detection module and the die-cutting module based on the position information of the second detection unit and the position information of the die-cutting module. The second detection result is either defective or acceptable. When the second detection result indicates a defect, the second detection result also includes the location information of the defective tab and / or the defective region.

[0165] In the technical solution of this application embodiment, image detection and electrode defect detection are performed on the first electrode tab on the current die-cut electrode sheet to facilitate the detection of the first electrode tab of the current die-cut electrode sheet. By performing defect detection on the current die-cut electrode sheet in different processes, the detection accuracy of the current die-cut electrode sheet is improved and the waste of electrode sheet material caused by defects is reduced.

[0166] Specifically, in step S2, in response to the presence of a defect on the current die-cut electrode sheet, the step of determining the identification tab corresponding to the defect on the current die-cut electrode sheet based on the location information of the defect on the current die-cut electrode sheet, the length of the single-cell electrode sheet, and the distance between the die-cutting module and the detection module includes the following implementation methods.

[0167] For easy identification, the marking tabs are located at a preset position on the die-cut electrode sheet. For example, the preset position could be the location of the last marking tab on the die-cut electrode sheet.

[0168] In some embodiments, in response to a first detection result or a second detection result indicating that the current die-cut electrode has a defect, the length of the single-cell electrode is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect of the current die-cut electrode.

[0169] In the technical solution of this application embodiment, when there is a defect on the current die-cut electrode sheet, the marking tab corresponding to the defect of the current die-cut electrode sheet is determined according to the distance between the single cell electrode sheet length and the die-cutting module and the second detection unit. By marking the current die-cut electrode sheet, the die-cut electrode sheet with defects can be removed.

[0170] Among them, the current die-cut electrode includes the adjacent i-th single-cell electrode, the (i+1)-th single-cell electrode, and the (i+2)-th single-cell electrode.

[0171] In some specific embodiments, step S2 specifically includes: in response to the first detection result indicating that the i-th single-cell electrode has a defect and the length of the single-cell electrode is not less than the distance between the die-cutting module and the second detection unit, a first identification tab is die-cut on the i-th single-cell electrode. That is, when the first identification tab is detected, it indicates that the single-cell electrode with the first identification tab is a defective product.

[0172] In the technical solution of this application embodiment, when a defect is detected in the i-th single-cell electrode before the first tab is die-cut out from the edge of the i-th single-cell electrode, the electrode length of the i-th single-cell electrode is not less than the distance between the die-cutting module and the second detection unit. The first marking tab is die-cut out on the i-th single-cell electrode to mark the i-th single-cell electrode as having a defect, which helps to remove the single-cell electrode with the defect.

[0173] In some embodiments, the die-cutting position of the next mark is determined based on the location information of the defect on the current die-cut electrode in the first detection result. To reduce computational load, electrode tab defect detection and slitting defect detection may not be performed on the current die-cut electrode.

[0174] In the technical solution of this application embodiment, the next marking die-cutting position is determined based on the position of the defective surface on the current die-cutting electrode sheet, thereby reducing the waste of electrode sheet material caused by defects.

[0175] Specifically, when the current die-cut electrode is a full-tab electrode or an equally spaced tab electrode, a reset is not required when determining the die-cutting position of the next mark. Since the spacing between the tabs at the edge of the electrode material is consistent in both full-tab and equally spaced tab electrodes, the die-cutting module does not need to adjust the die-cutting spacing, so the mark can be directly die-cut at the current die-cutting position.

[0176] Specifically, when the current die-cut electrode is a tapered tab spacing electrode, the die-cutting module is simultaneously reset and recut when determining the next marked die-cutting position. Since the spacing between adjacent tabs in a tapered tab spacing electrode is inconsistent, the die-cutting spacing needs to be adjusted each time. When the die-cutting of the current electrode is terminated, the current die-cutting spacing is different from the initial die-cutting spacing, so a reset is required to restore the die-cutting spacing to the initial die-cutting spacing.

[0177] In the technical solution of this application embodiment, the die-cutting of the current die-cutting electrode is terminated based on the position of the defective surface at the current die-cutting electrode, thereby reducing the waste of electrode material caused by defects.

[0178] In some specific embodiments, the distance between the current die-cutting position and the preset position on the i-th single-cell electrode sheet in a first direction is determined as the first distance; the distance between the defect and the preset position on the i-th single-cell electrode sheet in a first direction is determined as the second distance, where the first direction is the moving direction of the electrode material; and the preset position is the starting position of the single-cell electrode sheet.

[0179] In response to the first distance being not less than the second distance, a mark is die-cut at the current die-cut position on the i-th single cell electrode.

[0180] In the technical solution of this application embodiment, when there is a defect on the i-th single cell electrode sheet and the position of the defect surface is downstream of the current die-cutting position, a mark is die-cut at the current die-cutting position on the i-th single cell electrode sheet to form the next single cell electrode sheet, which can reduce the waste of electrode sheet material caused by defects.

[0181] In some embodiments, step S2 specifically includes: in response to the first detection result that the i-th single cell electrode has a defect and the distance between the die-cutting module and the second detection unit is greater than the length of the single cell electrode but less than twice the length of the single cell electrode, the i-th single cell electrode is continued to be die-cut and a second identification tab is die-cut on the (i+1)-th single cell electrode.

[0182] In the technical solution of this application embodiment, a defect is detected in the i-th single-cell electrode before the first tab is die-cut out at the edge of the i-th single-cell electrode. The distance between the die-cutting module and the second detection unit is greater than the length of the single-cell electrode but less than twice the length of the single-cell electrode. A second marking tab is die-cut out on the (i+1)-th single-cell electrode after the current die-cut electrode to mark the i-th single-cell electrode as defective, which helps to remove the die-cut electrode with defects.

[0183] In some embodiments, step S2 specifically includes: in response to the second detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module and the second detection unit, the i-th single cell electrode is continued to be die-cut and a second identification tab is die-cut on the (i+1)-th single cell electrode.

[0184] In the technical solution of this application embodiment, after the first tab is die-cut out from the edge of the i-th single cell electrode, a defect is detected in the i-th single cell electrode. The length of the single cell electrode is not less than the distance between the die-cutting module and the second detection unit. A second marking tab is die-cut out on the (i+1)-th single cell electrode to mark the i-th single cell electrode as having a defect, which helps to remove the single cell electrode with the defect.

[0185] In some embodiments, step S2 specifically includes: in response to the second detection result that the i-th single cell electrode has a defect and the length of the single cell electrode is less than the distance between the die-cutting module and the second detection unit, then based on the defect detection result of the (i+1)-th single cell electrode, determining the identification tab corresponding to the defect of the i-th single cell electrode.

[0186] In the technical solution of this application embodiment, after the first tab is die-cut from the edge of the i-th single-cell electrode, a defect is detected in the i-th single-cell electrode. When the length of the single-cell electrode is less than the distance between the die-cutting module and the second detection unit, the marking tab corresponding to the defect of the i-th single-cell electrode is determined according to the defect detection result of the (i+1)-th single-cell electrode. This saves the number of die-cutting times for defect marking and helps to remove single-cell electrodes with defects.

[0187] In one specific embodiment, the current die-cut electrode sheet further includes the (i+2)th single-cell electrode sheet.

[0188] In response to the defect in the (i+1)th single cell electrode, the (i+1)th single cell electrode is die-cut and the third identification tab is die-cut on the (i+2)th single cell electrode.

[0189] If there is no defect in the (i+1)th single cell electrode, continue die-cutting the (i+1)th single cell electrode and die-cut the fourth identification tab on the (i+2)th single cell electrode.

[0190] In the technical solution of this application embodiment, when there is a defect in the i-th single cell electrode, the identification tab corresponding to the defect of the i-th single cell electrode is determined according to the defect detection result of the (i+1)-th single cell electrode, thereby reducing the number of die-cutting times for the defect identification.

[0191] In this embodiment, the shapes of the first electrode tab, the first identification electrode tab, the second identification electrode tab, the third identification electrode tab, and the fourth identification electrode tab are all different. Specifically, the shapes of the first electrode tab, the first identification electrode tab, the second identification electrode tab, the third identification electrode tab, and the fourth identification electrode tab can be rectangles, regular trapezoids, inverted trapezoids, triangles, "U" shapes, "convex" shapes, or can be set according to actual conditions.

[0192] In this embodiment, the first electrode tab, the first marking electrode tab, the second marking electrode tab, the third marking electrode tab, and the fourth marking electrode tab can have the same shape but different sizes.

[0193] For example, the shapes of the first electrode tab, the first marking electrode tab, the second marking electrode tab, the third marking electrode tab, and the fourth marking electrode tab can all be trapezoidal, but their sizes can decrease sequentially. Specifically, the lengths of the first electrode tab, the first marking electrode tab, the second marking electrode tab, the third marking electrode tab, and the fourth marking electrode tab in the first direction can decrease sequentially.

[0194] For example, the shapes of the first electrode tab, the first marking electrode tab, the second marking electrode tab, the third marking electrode tab, and the fourth marking electrode tab can all be trapezoidal, but their sizes can increase sequentially. Specifically, the lengths of the first electrode tab, the first marking electrode tab, the second marking electrode tab, the third marking electrode tab, and the fourth marking electrode tab can increase sequentially in the first direction.

[0195] In some embodiments, the i-th, (i+1)-th, and (i+2)-th single-cell electrode sheets that have undergone die-cutting are wound along a second direction. The wound (i+2)-th, (i+1)-th, and i-th single-cell electrode sheets are controlled to unfold sequentially along a third direction, and defective single-cell electrode sheets are determined and removed based on the single-mark tabs on the electrode sheets; the third direction is opposite to the second direction. When the second direction is clockwise, the third direction is counterclockwise. When the second direction is counterclockwise, the third direction is clockwise.

[0196] In the technical solution of this application embodiment, the i-th single-cell electrode, the (i+1)-th single-cell electrode, and the (i+2)-th single-cell electrode are sequentially wound and unwound to determine the single-cell electrode that needs to be rejected based on the marking tabs on the single-cell electrode, so as to remove the defective single-cell electrode based on the marking tabs.

[0197] Due to the manufacturing process, after the first tab is die-cut at the edge of the electrode material, the die-cut electrodes need to be wound sequentially. Therefore, during the winding process, the die-cut electrodes formed first on the electrode material are closer to the winding center axis; the die-cut electrodes formed last are farther away from the winding center axis. During the unfolding process, the die-cut electrodes farther away from the winding center axis are unfolded and identified first, and the die-cut electrodes closer to the winding center axis are unfolded and identified last.

[0198] During the unfolding process, each die-cut electrode sheet undergoes defect detection. When the first identification tab is detected, the die-cut electrode sheet with the first identification tab is considered defective. When the second identification tab is detected, the die-cut electrode sheet with the second identification tab is considered good, and the next die-cut electrode sheet adjacent to it is defective. When the third identification tab is detected, the die-cut electrode sheet with the third identification tab is considered good, and the two die-cut electrode sheets adjacent to it are both defective. When the fourth identification tab is detected, the die-cut electrode sheet with the fourth identification tab and the next die-cut electrode sheet adjacent to it are both good. In other words, the die-cut electrode sheet that follows the die-cut electrode sheet with the fourth identification tab and is separated by one single-cell electrode sheet is defective.

[0199] In some embodiments, the electrode material has two surfaces facing away from each other, and at least one surface of the electrode material has a coating area and empty foil areas located at the edges of the coating area. The coating area is used to form an electrode coating.

[0200] Please see Figure 9 , Figure 9 This is a schematic diagram of a specific embodiment of the electrode material provided in this application.

[0201] The surface image of the electrode material is used to detect the coating area, and the position information of the coating area edge and the width data of the coating area on the electrode material are determined. Specifically, the width of the coating area on the first surface of the electrode material is A3, and the width of the coating area on the second surface of the electrode material is B3.

[0202] Based on the positional information of the edges of the coating areas corresponding to the two surfaces of the electrode material, the lateral error values ​​corresponding to each side edge of the coating area are determined. Specifically, the lateral error value between the edge position of the coating area on the first surface and the edge position of the coating area on the second surface corresponding to the left side of the electrode material moving along the first direction is defined as the left-side error value M; the lateral error value between the edge position of the coating area on the first surface and the edge position of the coating area on the second surface corresponding to the right side of the electrode material moving along the first direction is defined as the right-side error value N.

[0203] The distance between the ends of the first tabs formed on both sides of the electrode material near the coating area in the first image is detected to obtain the width data between the first tabs on both sides of the electrode material. Specifically, on the first surface of the electrode material, the distance between the ends of the first tabs formed on both sides of the electrode material near the coating area is A6; on the second surface of the electrode material, the distance between the ends of the first tabs formed on both sides of the electrode material near the coating area is B6.

[0204] After the electrode material is cut, the first surface of the electrode material region formed by the electrode material is imaged to obtain a second image.

[0205] The electrode material region in the second image is detected to obtain the width data of the coating area in the electrode material region (denoted as A2) and the width data between the end of the first electrode tab near the coating area and the edge of the coating area (denoted as A1).

[0206] Based on the position information of the edge of the coating area, the width data of the coating area on the electrode material, the width data between the first tabs on both sides of the electrode material, the width data of the coating area in the electrode material area, the width data between the end of the first tab near the coating area and the edge of the coating area, and the side error value corresponding to each side edge of the coating area, the width data of the coating area corresponding to the other surface in the electrode material area (denoted as B2), the width data between the end of the first tab near the coating area and the edge of the coating area (denoted as B1), and the width data of the coating area in the two surfaces corresponding to the other electrode material area formed by the electrode material (denoted as A4 for the first surface and B4 for the second surface), and the width data between the end of the first tab near the coating area and the edge of the coating area (denoted as A5 for the first surface and B5 for the second surface) are determined.

[0207] In one specific embodiment, the difference between the width of the coating area on the first surface of the electrode material and the width of the coating area in the region of the electrode material is used as the width of the coating area in the first surface corresponding to the other electrode material region formed by the electrode material, i.e., A4=A3-A2.

[0208] In one specific embodiment, the sum of the width data of the coating area on the first surface corresponding to the other electrode material area formed by the electrode material and the error value N on the right is used as the width data of the coating area on the second surface corresponding to the other electrode material area formed by the electrode material, i.e., B4=A4+N.

[0209] In one specific embodiment, the sum of the width data of the coating area on the first surface of the electrode material region and the left error value M is used as the width data of the coating area corresponding to the second surface of the electrode material region, i.e., B2=A2+M.

[0210] In one specific embodiment, the difference between the distance between the ends of the first tabs formed on both sides of the electrode material near the coating area on the second surface of the electrode material and the width data of the coating area corresponding to the second surface in the electrode material region is used as the width data between the ends of the first tabs near the coating area and the edge of the coating area on the second surface of the electrode material, i.e., B1=B6-B2.

[0211] In one specific embodiment, the difference between the distance between the ends of the first tabs formed on both sides of the first surface of the electrode material near the coating area and the width between the end of the first tab near the coating area and the edge of the coating area on the first surface of the electrode material and the width of the coating area on the first surface of the electrode material is taken as the width between the end of the first tab near the coating area and the edge of the coating area on the first surface of the electrode material, i.e., A5=A6-A1-A3.

[0212] In one specific embodiment, the difference between the distance between the ends of the first tabs formed on both sides of the electrode material near the coating area on the second surface of the electrode material and the width data between the end of the first tab near the coating area and the edge of the coating area on the first surface of the electrode material, the width data of the coating area on the first surface of the electrode material region, and the width data of the coating area in the second surface corresponding to the other electrode material region formed by the electrode material are used as the width data between the end of the first tab near the coating area and the edge of the coating area on the second surface of the electrode material, i.e., B5=B6-A1-A2-B4.

[0213] In the technical solution of this application embodiment, the size and position of the coating area and the first electrode tab are detected by the surface images, the first image and the second image of the two surfaces of the electrode material, respectively, so as to obtain the width data of the coating area, the width data between the first electrode tabs on both sides of the electrode material, and the width data between the end of the first electrode tab near the coating area and the edge of the coating area, so as to facilitate the detection of whether the size of each electrode is qualified.

[0214] In some embodiments, the electrode die-cutting method further includes the following steps.

[0215] After the electrode material is cut, images are acquired from the two surfaces of the two electrode material regions to obtain the third and fourth images.

[0216] The electrode material regions in the third and fourth images are detected to obtain the width data of the coating area on the two surfaces of each electrode material region, such as A2, B2, A4, B4, and the width data between the end of the first electrode tab near the coating area and the nearest edge of the coating area, such as A1, B1, A5, B5.

[0217] In the technical solution of this application embodiment, image acquisition and size detection are performed on the surface image of the slit electrode material area to facilitate the detection of whether the size of each electrode is qualified.

[0218] Specifically, before die-cutting the first tab at the edge of the electrode material, target detection is performed on the surface image of the electrode material to obtain the position and size information of the empty foil area; the position of the electrode material is adjusted based on the width of the empty foil area on the electrode material so that A1+B1=A5+B5, and the values ​​of A1, B1, A5, and B5 are between 0.5mm and 2.5mm.

[0219] In the technical solution of this application embodiment, the die-cutting of the electrode material is corrected by detecting the position and size information of the hollow foil area in the surface image of the electrode material, thereby improving the die-cutting accuracy of the electrode.

[0220] In some embodiments, in response to die-cutting the first tab on the edge of the single-cell electrode, an image is acquired on a surface of the electrode material to obtain a first image; the axis of symmetry of the electrode material in the first image is detected to obtain the axis of symmetry of the electrode material and its position information; the direction of the axis of symmetry is parallel to the direction of movement of the electrode material; based on the position information of the axis of symmetry, the position of the electrode material is adjusted so that A2+B2=A4+B4.

[0221] In the technical solution of this application embodiment, the position of the electrode material is adjusted based on the position information of the electrode material's symmetry axis by detecting the position of the electrode material's symmetry axis in the first image, thereby realizing the cutting correction of the electrode material and improving the cutting accuracy of the electrode material.

[0222] like Figures 3 to 6 This application also provides an electrode sheet, manufactured using the electrode sheet die-cutting method described in any of the foregoing embodiments. The edge of the electrode sheet has a first electrode tab 55 and / or a marking electrode tab 56, wherein the first electrode tab 55 is different from the marking electrode tab 56. The electrode sheet in this embodiment is the electrode sheet material 5 described in the above embodiments.

[0223] In this embodiment, the marking tab 56 set on the electrode sheet serves as a defective product identifier, eliminating the need for additional equipment to mark defective products on the electrode sheet. This facilitates the reduction of electrode waste caused by defects in the electrode sheet by using the marking tab 56.

[0224] The marking tab 56 can be at least one of the following: first marking tab 561, second marking tab 562, third marking tab 563, and fourth marking tab 564. The first marking tab 561, second marking tab 562, third marking tab 563, and fourth marking tab 564 are all different; specifically, they can differ in shape or size. The shape of the marking tab 56 can be a regular trapezoid, triangle, inverted trapezoid, rectangle, rhombus, "convex," or "concave," etc., depending on the specific circumstances.

[0225] Other parts not mentioned in this embodiment are similar to those described in the above embodiments and will not be repeated here.

[0226] Please see Figure 10 , Figure 10 This is a schematic diagram of a framework of an embodiment of the electronic terminal provided in this application. The electronic terminal 80 includes a memory 81 and a processor 82 coupled to each other. The processor 82 is used to execute the computer program stored in the memory 81 to implement the steps of any of the above-described electrode die-cutting method embodiments. In a specific implementation scenario, the electronic terminal 80 may include, but is not limited to, a microcomputer or a server. In addition, the electronic terminal 80 may also include mobile devices such as laptops and tablets, which are not limited here.

[0227] Specifically, processor 82 controls itself and memory 81 to implement the steps of any of the above-described electrode die-cutting method embodiments. Processor 82 can also be referred to as a CPU (Central Processing Unit). Processor 82 may be an integrated circuit chip with signal processing capabilities. Processor 82 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor can be a microprocessor or any conventional processor. Furthermore, processor 82 can be implemented using integrated circuit chips.

[0228] Please see Figure 11 , Figure 11 This is a schematic diagram of a framework of an embodiment of the computer-readable storage medium provided in this application. The computer-readable storage medium 90 stores program instructions 901 that can be executed by a processor. The program instructions 901 are used to implement the steps of any of the above-described embodiments of the electrode die-cutting method.

[0229] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0230] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0231] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0232] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0233] If the integrated unit is implemented as 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0234] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A pole piece die-cutting method characterized by, Applied to an electrode die-cutting system, the electrode die-cutting system includes a die-cutting module and a detection module; The electrode die-cutting method includes: Acquire an image of the current die-cut electrode sheet, and perform defect detection on the image of the current die-cut electrode sheet; In response to a defect on the current die-cut electrode sheet, a marking tab corresponding to the defect is determined based on the location information of the defect on the current die-cut electrode sheet, the length of a single-cell electrode sheet, and the distance between the die-cutting module and the detection module; the length of a single-cell electrode sheet is determined by a mark die-cut on the current die-cut electrode sheet; the marking tab includes at least one of a first marking tab, a second marking tab, a third marking tab, and a fourth marking tab, wherein the first marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the second marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the second marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the third marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the fourth marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the fifth marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the sixth marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the seventh marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the eighth marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the ninth marking tab indicates that the die-cut electrode sheet with the first marking tab is a defective product; the eleventh ... The die-cut electrode with the second marking tab is a good product, and the die-cut electrode adjacent to the die-cut electrode with the second marking tab is a defective product; the third marking tab indicates that the die-cut electrode with the third marking tab is a good product, and the two die-cut electrodes adjacent to the die-cut electrode with the third marking tab are defective products; the fourth marking tab indicates that the die-cut electrode with the fourth marking tab and the die-cut electrode adjacent to the die-cut electrode with the fourth marking tab are both good products, and the die-cut electrode with a single cell electrode spaced between the die-cut electrode with the fourth marking tab and the die-cut electrode with the fourth marking tab is a defective product.

2. The pole piece die-cutting method of claim 1, wherein, The detection module includes a first detection unit and a second detection unit. The first detection unit is located upstream of the die-cutting module, and the second detection unit is located downstream of the die-cutting module. The defect detection of the image of the current die-cut electrode sheet includes: Before die-cutting the first tab on the edge of the current die-cut electrode sheet, the first detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain a first detection result; After the first tab is die-cut on the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image of the current die-cut electrode sheet to obtain a second detection result.

3. The pole piece die-cutting method of claim 2, wherein, The current die-cut electrode sheet includes a metal current collector and a plurality of sequentially stacked electrode coatings formed on at least one surface of the metal current collector; The step of acquiring an image of the current die-cut electrode sheet through the first detection unit and performing defect detection on the image of the current die-cut electrode sheet to obtain a first detection result includes: At least one surface image of each electrode coating is acquired by the first detection unit; Defect detection is performed on the surface images of each electrode coating to obtain the first detection result.

4. The pole piece die-cutting method of claim 2, wherein, The second test result includes the electrode detection result; After die-cutting the first electrode tab at the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image to obtain a second detection result, including: After the first electrode tab is die-cut on the edge of the current die-cut electrode sheet, the second detection unit acquires an image of a surface of the current die-cut electrode sheet to obtain a first image; Defect detection is performed on the first electrode tab in the first image to obtain the electrode tab detection result.

5. The pole piece die-cutting method of claim 2, wherein, The second detection result includes the cutting detection result; After die-cutting the first electrode tab at the edge of the current die-cut electrode sheet, the second detection unit acquires an image of the current die-cut electrode sheet and performs defect detection on the image to obtain a second detection result, including: After die-cutting the first tab at the edge of the current die-cut electrode sheet, the current die-cut electrode sheet is divided into two electrode material regions along the extending slitting line of the current die-cut electrode sheet in the first direction; The second detection unit acquires an image of the surface of the electrode material region formed by the current die-cut electrode to obtain a second image; The electrode material region in the second image is detected to obtain the segmentation detection result.

6. The electrode die-cutting method according to claim 5, characterized in that, The second test result also includes the electrode detection result; Before the step of dividing the current die-cut electrode sheet into two electrode material regions along the extending slitting line of the current die-cut electrode sheet in the first direction, the method further includes: After die-cutting the first tab on the edge of the current die-cut electrode sheet, an image is acquired on one surface of the current die-cut electrode sheet to obtain a first image; Defect detection is performed on the first electrode tab in the first image to obtain the electrode tab detection result.

7. The electrode die-cutting method according to claim 2, characterized in that, In response to the presence of a defect on the current die-cut electrode sheet, the system determines an identification tab corresponding to the defect on the current die-cut electrode sheet based on the location information of the defect, the length of the single-cell electrode sheet, and the distance between the die-cutting module and the detection module, including: In response to the first detection result or the second detection result indicating that the current die-cut electrode has a defect, the length of the single-cell electrode is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect of the current die-cut electrode.

8. The electrode die-cutting method according to claim 7, characterized in that, The current die-cut electrode includes the i-th single-core electrode; i is a positive integer; In response to the first or second detection result indicating a defect in the current die-cut electrode sheet, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including: In response to the first detection result indicating that the i-th single-cell electrode has a defect and the length of the single-cell electrode is not less than the distance between the die-cutting module and the second detection unit, a first identification tab is die-cut on the i-th single-cell electrode.

9. The electrode die-cutting method according to claim 8, characterized in that, The electrode die-cutting method includes: Based on the location information of the defect on the i-th single cell electrode in the first detection result, the die-cutting position of the mark on the (i+1)-th single cell electrode is determined.

10. The electrode die-cutting method according to claim 9, characterized in that, The step of determining the die-cutting position of the mark on the (i+1)th single-cell electrode based on the position information of the defect on the i-th single-cell electrode in the first detection result includes: The distance between the current die-cutting position and the preset position on the i-th single-cell electrode sheet in a first direction is determined as a first distance; the distance between the defect and the preset position on the i-th single-cell electrode sheet in the first direction is determined as a second distance, where the first direction is the moving direction of the currently die-cut electrode sheet; and the preset position is the starting position of the single-cell electrode sheet. In response to the first distance being not less than the second distance, the mark is die-cut at the current die-cutting position on the i-th single cell electrode.

11. The electrode die-cutting method according to claim 7, characterized in that, The current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer; In response to the first or second detection result indicating a defect in the current die-cut electrode sheet, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including: In response to the first detection result indicating that the i-th single-cell electrode has a defect and the distance between the die-cutting module and the second detection unit is greater than the length of the single-cell electrode but less than twice the length of the single-cell electrode, the die-cutting of the i-th single-cell electrode continues and a second identification tab is die-cut on the (i+1)-th single-cell electrode.

12. The electrode die-cutting method according to claim 7, characterized in that, The current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer; In response to the first or second detection result indicating a defect in the current die-cut electrode sheet, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including: In response to the second detection result indicating that the i-th single cell electrode has a defect and the length of the single cell electrode is not less than the distance between the die-cutting module and the second detection unit, the die-cutting of the i-th single cell electrode continues and the second identification tab is die-cut on the (i+1)-th single cell electrode.

13. The electrode die-cutting method according to claim 7, characterized in that, The current die-cut electrode sheet includes the i-th single-cell electrode sheet and the (i+1)-th single-cell electrode sheet; i is a positive integer; In response to the first or second detection result indicating a defect in the current die-cut electrode sheet, the length of the single-cell electrode sheet is compared with the distance between the die-cutting module and the second detection unit to determine the identification tab corresponding to the defect in the current die-cut electrode sheet, including: In response to the second detection result indicating that the i-th single-cell electrode has a defect and the length of the single-cell electrode is less than the distance between the die-cutting module and the second detection unit, the identification tab corresponding to the defect of the i+1-th single-cell electrode is determined based on the defect detection result of the i-th single-cell electrode.

14. The electrode die-cutting method according to claim 13, characterized in that, The current die-cut electrode sheet also includes the (i+2)th single-core electrode sheet; The step of determining the identification tab corresponding to the defect of the i-th single-cell electrode based on the defect detection result of the (i+1)-th single-cell electrode includes: In response to the presence of a defect in the (i+1)th single-cell electrode, the (i+1)th single-cell electrode is continued to be die-cut, and a third identification tab is die-cut on the (i+2)th single-cell electrode. Alternatively, in response to the absence of defects in the (i+1)th single-cell electrode, the (i+1)th single-cell electrode is continued to be die-cut, and a fourth identification tab is die-cut on the (i+2)th single-cell electrode.

15. The electrode die-cutting method according to claim 1, characterized in that, The currently die-cut electrode sheet includes a continuous i-th single-cell electrode sheet, an (i+1)-th single-cell electrode sheet, and an (i+2)-th single-cell electrode sheet. The electrode sheet die-cutting method further includes: The die-cut single-cell electrode sheet, the (i+1)th single-cell electrode sheet, and the (i+2)th single-cell electrode sheet are wound along the second direction; The (i+2)th single-cell electrode, the (i+1)th single-cell electrode, and the ith single-cell electrode are sequentially unwound along a third direction, and the defective single-cell electrode is removed based on the marking tab on the single-cell electrode; the third direction is opposite to the second direction.

16. An electrode sheet, characterized in that, The electrode sheet is obtained by the electrode die-cutting method as described in any one of claims 1 to 15; the edge of the electrode sheet has a first electrode tab and / or an identification electrode tab.

17. An electrode die-cutting system, characterized in that, include: The die-cutting module is used to die-cut the current die-cut electrode sheet and to die-cut the first electrode tab and the marking electrode tab on the edge of the current die-cut electrode sheet; The first electrode tab is different from the marked electrode tab; The detection module is used to perform defect detection on the image of the currently die-cut electrode sheet; A controller, communicatively connected to the detection module and the die-cutting module, is configured to, in response to a defect on the currently die-cut electrode sheet, determine the marking tab corresponding to the defect on the current die-cut electrode sheet based on the location information of the defect on the current die-cut electrode sheet, the length of a single-cell electrode sheet, and the distance between the die-cutting module and the detection module; the length of the single-cell electrode sheet is determined by a mark die-cut on the current die-cut electrode sheet; the marking tab includes at least one of a first marking tab, a second marking tab, a third marking tab, and a fourth marking tab, wherein the first marking tab indicates a die with the first marking tab. The die-cut electrode sheet is defective; the second marking tab indicates that the die-cut electrode sheet with the second marking tab is good, and the die-cut electrode sheet preceding the die-cut electrode sheet with the second marking tab is defective; the third marking tab indicates that the die-cut electrode sheet with the third marking tab is good, and the two die-cut electrode sheets preceding the die-cut electrode sheet with the third marking tab are both defective; the fourth marking tab indicates that the die-cut electrode sheet with the fourth marking tab and the die-cut electrode sheet preceding the die-cut electrode sheet with the fourth marking tab are both good, and the die-cut electrode sheet separated from the die-cut electrode sheet with the fourth marking tab by one single-cell electrode sheet is defective.

18. An electronic terminal, characterized in that, The electronic terminal includes a memory and a processor coupled to each other. The processor is used to execute program instructions stored in the memory and to execute program data to implement the steps in the electrode die-cutting method as described in any one of claims 1 to 15.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the electrode die-cutting method as described in any one of claims 1 to 15.

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