Electrode sheet defect detection system and method

Abstract

The present application relates to the technical field of batteries, and discloses an electrode sheet defect detection system and method. The system comprises: a first inspection unit, used for inspecting the appearance and dimension of a B surface of a die-cut electrode sheet; a second inspection unit, used for inspecting the appearance and dimension of the die-cut electrode sheet; a slitting device, used for slitting the die-cut electrode sheet to obtain a first-side electrode sheet and a second-side electrode sheet; a third inspection unit, used for inspecting the appearance and dimension of an A surface of the first-side electrode sheet; a fourth inspection unit, used for inspecting the appearance and dimension of an A surface of the second-side electrode sheet; and a control device, used for performing appearance shadow detection on the electrode sheet on the basis of inspection information to obtain an appearance shadow detection result, and / or performing dimension abrupt change detection on the electrode sheet on the basis of the inspection information to obtain a dimension abrupt change detection result, so that a wrinkling abnormality can be accurately detected in the production process of the electrode sheet, thereby improving the safety of a battery.

Description

Pole piece defect detection system and method

[0001] The present application claims priority to the Chinese patent application No. 202411329971.0, filed on September 24, 2024, and entitled "Pole piece defect detection system and method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a pole piece defect detection system and method. BACKGROUND

[0003] At present, in the production process of lithium battery pole piece, due to the reasons such as deviation abnormality, roller parallelism problem, tension stability problem, pressure wheel parallelism problem and pressure wheel pressure problem, the pole piece is prone to wrinkle abnormality. The pole piece wrinkle will cause battery self-discharge and other abnormalities, which has great safety risk.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a pole piece defect detection system and method, which aims to solve the problem of how to detect the wrinkle abnormality in the production process of pole piece.

[0006] In a first aspect, the present application provides a pole piece defect detection system, comprising: a first detection unit, a second detection unit, a slitting device, a third detection unit, a fourth detection unit and a control device.

[0007] The first detection unit is configured to detect the B-face appearance and B-face size of the die-cut pole piece.

[0008] The second detection unit is configured to detect the pole piece appearance and pole piece size of the die-cut pole piece.

[0009] The slitting device is configured to slit the die-cut pole piece to obtain a first side pole piece and a second side pole piece.

[0010] The third detection unit is configured to detect the A-face appearance and A-face size of the first side pole piece.

[0011] The fourth detection unit is configured to detect the A-face appearance and A-face size of the second side pole piece.

[0012] The control device is configured to perform abnormal creasing detection on the polar piece according to the detection information, wherein the detection information includes the B-face appearance, the B-face size, the polar piece appearance, the polar piece size, the A-face appearance and the A-face size of the first side polar piece, and the A-face appearance and the A-face size of the second side polar piece, and the abnormal creasing detection on the polar piece according to the detection information includes: performing appearance shadow detection on the polar piece according to the detection information to obtain an appearance shadow detection result; and / or performing size mutation detection on the polar piece according to the detection information to obtain a size mutation detection result.

[0013] In the technical scheme of the embodiment of the application, a plurality of detection units are arranged at different positions, each detection unit detects different appearances and sizes, so as to cover all areas of the A and B faces of the polar piece after the die cutting, and the abnormal creasing detection on the polar piece is performed according to the detection information, so that the abnormal creasing can be detected in the production process of the polar piece, and the safety of the battery can be improved. In addition, in the technical scheme of the embodiment of the application, the abnormal creasing detection on the polar piece is performed from two aspects of the appearance shadow detection and the size mutation detection, so that the accuracy of the defect detection can be improved.

[0014] In some embodiments, the control device is further configured to obtain a film area and a shadow area of the polar piece according to the detection information, and calculate a gray value difference between the shadow area and the film area; when the gray value difference is greater than a preset gray value difference, obtain an area size and an area length of the shadow area; and when the area size meets a preset area size and the area length is greater than a preset length, determine that the shadow area is a suspected creasing area.

[0015] In the technical scheme of the embodiment of the application, whether the shadow area is a suspected creasing area is determined according to the gray value difference between the shadow area and the film area, and the area size and the area length of the shadow area, so that the accuracy of the appearance shadow detection can be improved, and the accuracy of the defect detection can be further improved.

[0016] In some embodiments, the control device is further configured to calculate a polar width difference and a film width difference between adjacent target areas according to the detection information, wherein the target area is an area between adjacent tabs; and when the polar width difference is in a preset first difference interval and the film width difference is in a preset second difference interval, determine that a middle area between the adjacent target areas is a suspected creasing area.

[0017] In the technical scheme of the embodiment of the application, whether the middle area between the adjacent target areas is a suspected creasing area is determined according to whether the polar width difference and the film width difference between the adjacent target areas have size mutations, so that the accuracy of the size mutation detection can be improved, and the accuracy of the defect detection can be further improved.

[0018] In some embodiments, the pole piece defect detection system further comprises an alarm device.

[0019] The control device is further configured to control the pole piece production device to stop running and generate an alarm instruction when the appearance shadow detection result or the size mutation detection result indicates that a suspected wrinkle area is detected.

[0020] The alarm device is configured to receive the alarm instruction and alarm according to the alarm instruction.

[0021] In the technical solution of the embodiments of the present application, when the appearance shadow detection result or the size mutation detection result indicates that a suspected wrinkle area is detected, the alarm device alarms, so that the user can be notified in time when a suspected wrinkle area is detected.

[0022] In some embodiments, the pole piece defect detection system further comprises a marking device.

[0023] The control device is further configured to generate a marking instruction and send the marking instruction to the marking device when the appearance shadow detection result and the size mutation detection result both indicate that a suspected wrinkle area is detected.

[0024] The marking device is configured to mark the defective product at the corresponding position of the pole piece according to the marking instruction.

[0025] In the technical solution of the embodiments of the present application, when the appearance shadow detection result and the size mutation detection result both indicate that a suspected wrinkle area is detected, the marking device directly marks the defective product at the corresponding position of the pole piece, so that the defect EA can be marked in time during the production of the pole piece, so that the user can continue the subsequent processing, and thus the yield and efficiency of the pole piece production can be improved.

[0026] In some embodiments, the control device is further configured to generate a marking instruction and send the marking instruction to the marking device when the appearance shadow detection result and the size mutation detection result of the first roll of pole pieces both indicate that a suspected wrinkle area is detected, and the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces indicates that a suspected wrinkle area is detected, wherein the first roll of pole pieces and the second roll of pole pieces are adjacent pole pieces, the first roll of pole pieces is used to roll into a first battery cell, and the second roll of pole pieces is used to roll into a second battery cell.

[0027] The marking device is configured to mark the defective product at the corresponding position of the first roll of pole pieces and the corresponding position of the second roll of pole pieces according to the marking instruction.

[0028] In the technical solution of the embodiment of the application, when the wrinkling defect continuity appears, the marking condition of the continuous EA is relaxed, and when the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is a suspected wrinkling area, the corresponding positions of the first roll of pole pieces and the second roll of pole pieces are marked as defective products by the marking device, so that the accuracy of the wrinkling defect detection can be improved, and the defective EA can be marked in time.

[0029] In some embodiments, the control device is further configured to, when the size mutation detection result is a suspected wrinkling area and the pole width difference between adjacent target areas is equal to the film width difference, calculate a pole width mutation of the pole piece according to the pole width information, wherein the target area is an area between adjacent pole ears; when the pole width mutation is equal to the pole width difference, generate a marking instruction and send the marking instruction to the marking device.

[0030] The marking device is configured to mark the corresponding position of the pole piece as a defective product according to the marking instruction.

[0031] In the technical solution of the embodiment of the application, when the size mutation detection result is a suspected wrinkling area, the pole width difference between adjacent target areas is equal to the film width difference, and the pole width mutation is equal to the pole width difference, the corresponding position of the pole piece is directly marked as a defective product by the marking device, so that the accuracy of the wrinkling defect detection can be improved, and the defective EA can be marked in time.

[0032] In some embodiments, the control device is further configured to obtain the setting position of the detection unit that detects the wrinkling defect and obtain the setting position of the detection unit that does not detect the wrinkling defect; and position the wrinkling defect according to the setting position of the detection unit that detects the wrinkling defect and the setting position of the detection unit that does not detect the wrinkling defect.

[0033] In the technical solution of the embodiment of the application, the wrinkling defect is positioned according to the setting position of the detection unit that detects the wrinkling defect and the setting position of the detection unit that does not detect the wrinkling defect, so that the wrinkling defect can be positioned accurately, and the accuracy of the pole piece defect detection can be improved.

[0034] In a second aspect, the application provides a pole piece defect detection method, comprising:

[0035] detecting the B surface appearance and the B surface size of the die-cut pole piece by a first detection unit;

[0036] detecting the pole piece appearance and the pole piece size of the die-cut pole piece by a second detection unit;

[0037] Detecting the A-face appearance and A-face size of the first side tab through a third detection unit, wherein the first side tab is one side tab of the die-cut tab after being slit, and the second side tab is another side tab of the die-cut tab after being slit;

[0038] Detecting the A-face appearance and A-face size of the second side tab through a fourth detection unit;

[0039] Performing a wrinkling abnormality detection on the tab according to the detection information, wherein the detection information includes the B-face appearance, the B-face size, the tab appearance, the tab size, the A-face appearance and the A-face size of the first side tab, and the A-face appearance and the A-face size of the second side tab, and the performing of the wrinkling abnormality detection on the tab according to the detection information includes: performing an appearance shadow detection on the tab according to the detection information to obtain an appearance shadow detection result; and / or performing a size mutation detection on the tab according to the detection information to obtain a size mutation detection result.

[0040] In the technical scheme of the embodiment of the present application, a plurality of detection units are arranged at different positions, each detection unit detects different appearance and size, so as to cover all areas of the A and B faces of the die-cut tab, and the wrinkling abnormality detection is performed on the tab according to the detection information, so that the wrinkling abnormality can be detected in the tab production process, thereby improving the safety of the battery, and since the wrinkling abnormality detection is performed on the tab from two aspects of the appearance shadow detection and the size mutation detection, the accuracy of the defect detection can be improved.

[0041] In some embodiments, after the wrinkling abnormality detection on the tab according to the detection information, the method further includes:

[0042] When the appearance shadow detection result or the size mutation detection result is a suspected wrinkling area, the tab production equipment is controlled to stop, and an alarm instruction is generated, and an alarm device is alarmed based on the alarm instruction.

[0043] In the technical scheme of the embodiment of the present application, when the appearance shadow detection result or the size mutation detection result is a suspected wrinkling area, the alarm device will alarm, so that the user can be notified in time when the suspected wrinkling area is detected.

[0044] In some embodiments, after the wrinkling abnormality detection on the tab according to the detection information, the method further includes:

[0045] When the appearance shadow detection result and the size mutation detection result are both suspected wrinkling areas, a marking instruction is generated;

[0046] A bad product marking is performed on the tab at a corresponding position through a marking device according to the marking instruction.

[0047] In the technical solution of the embodiment of the application, when the appearance shadow detection result and the size mutation detection result are both suspected wrinkle areas, the bad product marking is directly performed on the corresponding positions of the pole piece by the marking device, so that the defect EA can be marked in time in the production process of the pole piece, so that the user can continue the subsequent processing, and the yield and efficiency of the pole piece production can be improved.

[0048] In some embodiments, after the wrinkle abnormality detection on the pole piece according to the detection information, the method further comprises:

[0049] When the appearance shadow detection result and the size mutation detection result of the first roll of pole pieces are both suspected wrinkle areas, and the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is a suspected wrinkle area, a marking instruction is generated, wherein the first roll of pole pieces and the second roll of pole pieces are adjacent pole pieces, the first roll of pole pieces is used to be rolled into a first battery cell, and the second roll of pole pieces is used to be rolled into a second battery cell;

[0050] The bad product marking is performed on the corresponding positions of the first roll of pole pieces and the corresponding positions of the second roll of pole pieces by the marking device according to the marking instruction.

[0051] In the technical solution of the embodiment of the application, when the wrinkle defect continuity appears, the marking condition of the continuous EA is relaxed, when the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is a suspected wrinkle area, the bad product marking is performed on the corresponding positions of the first roll of pole pieces and the corresponding positions of the second roll of pole pieces by the marking device, so that the accuracy of the wrinkle defect detection can be improved, and the defect EA can be marked in time.

[0052] In some embodiments, when the size mutation detection result is a suspected wrinkle area, and the pole width difference between adjacent target areas is equal to the film width difference, the pole width mutation of the pole piece is calculated according to the pole width information, wherein the target area is the area between adjacent pole ears;

[0053] When the pole width mutation is equal to the pole width difference, a marking instruction is generated;

[0054] The bad product marking is performed on the corresponding positions of the pole piece by the marking device according to the marking instruction.

[0055] In the technical solution of the embodiment of the application, when the size mutation detection result is a suspected wrinkle area, the pole width difference between adjacent target areas is equal to the film width difference, and the pole width mutation is equal to the pole width difference, the bad product marking is directly performed on the corresponding positions of the pole piece by the marking device, so that the accuracy of the wrinkle defect detection can be improved, and the defect EA can be marked in time.

[0056] In a third aspect, the application provides a method for detecting defects of a pole piece, comprising:

[0057] obtaining the appearance and size of the B surface of the post-cut pole piece, the appearance and size of the pole piece;

[0058] obtaining the appearance and size of the A surface of the first side pole piece and the appearance and size of the A surface of the second side pole piece, wherein the first side pole piece is a side pole piece after the post-cut pole piece is cut, and the second side pole piece is another side pole piece after the pole piece is cut;

[0059] detecting the wrinkling abnormality of the pole piece according to the detection information, wherein the detection information comprises the appearance and size of the B surface of the post-cut pole piece, the appearance and size of the pole piece, the appearance and size of the A surface of the first side pole piece, and the appearance and size of the A surface of the second side pole piece, and the detecting the wrinkling abnormality of the pole piece according to the detection information comprises: detecting the appearance shadow of the pole piece according to the detection information to obtain an appearance shadow detection result, and / or detecting the size mutation of the pole piece according to the detection information to obtain a size mutation detection result.

[0060] In the technical scheme of the embodiments of the application, a plurality of detection units are arranged at different positions, each detection unit detects different appearance and size to cover all areas of the A and B surfaces of the post-cut pole piece, and the wrinkling abnormality of the pole piece is detected according to the detection information, so that the wrinkling abnormality can be detected in the production process of the pole piece, and the safety of the battery can be improved. In addition, in the technical scheme of the embodiments of the application, the wrinkling abnormality of the pole piece is detected from two aspects of appearance shadow detection and size mutation detection, so that the accuracy of defect detection can be improved.

[0061] In some embodiments, the detecting the appearance shadow of the pole piece according to the detection information to obtain an appearance shadow detection result comprises:

[0062] obtaining the film area and the shadow area of the pole piece according to the detection information, and calculating the gray value difference between the shadow area and the film area;

[0063] when the gray value difference is greater than a preset gray value difference, obtaining the area length and the area length of the shadow area;

[0064] when the area length is greater than a preset length, determining that the shadow area is a suspected wrinkling area.

[0065] In the technical scheme of the embodiments of the application, whether the shadow area is a suspected wrinkling area is determined according to the gray value difference between the shadow area and the film area, and the area length and the area length of the shadow area, so that the accuracy of appearance shadow detection can be improved, and the accuracy of defect detection can be further improved.

[0066] In some embodiments, the size mutation detection on the pole piece according to the detection information comprises:

[0067] calculating a pole width difference value and a film width difference value between adjacent target regions according to the detection information, wherein the target region is a region between adjacent pole ears;

[0068] when the pole width difference value is in a preset first difference interval and the film width difference value is in a preset second difference interval, determining that a middle region between the adjacent target regions is a suspected wrinkle region.

[0069] In the technical solution of the embodiments of the present application, whether the size of the pole width difference value and the film width difference value between adjacent target regions mutates is used to detect whether a middle region between the adjacent target regions is a suspected wrinkle region, so that the accuracy of size mutation detection can be improved, and the accuracy of defect detection can be further improved.

[0070] In some embodiments, after the wrinkle abnormality detection on the pole piece according to the detection information, the method further comprises:

[0071] obtaining the setting position of the detection unit that detects the wrinkle defect and the setting position of the detection unit that does not detect the wrinkle defect;

[0072] positioning the wrinkle defect according to the setting position of the detection unit that detects the wrinkle defect and the setting position of the detection unit that does not detect the wrinkle defect.

[0073] In the technical solution of the embodiments of the present application, the setting position of the detection unit that detects the wrinkle defect and the setting position of the detection unit that does not detect the wrinkle defect are used to position the wrinkle defect, so that the wrinkle defect can be positioned accurately, and the accuracy of pole piece defect detection can be improved.

[0074] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0075] FIG. 1 is a schematic diagram of the projection position of each unit in the pole piece defect detection system on the A surface of the pole piece;

[0076] FIG. 2 is a schematic diagram of the Mark hole on the A surface of the pole piece;

[0077] FIG. 3 is a schematic diagram of the projection position of the marking device in the pole piece defect detection system on the A surface of the pole piece;

[0078] FIG. 4 is a flow chart of a pole piece defect detection and correction method according to some embodiments of the present application;

[0079] FIG. 5 is a flow chart of a pole piece defect detection and correction method according to some embodiments of the present application;

[0080] FIG. 6 is a flow chart of a pole piece defect detection and correction method according to some embodiments of the present application;

[0081] FIG. 7 is a flow chart of a pole piece defect detection and correction method according to some embodiments of the present application.

[0082] Reference signs in the detailed description of the embodiments are as follows:

[0083] Die cutting unit 1, first detection unit 2, second detection unit 3, slitting device 4, third detection unit 5, fourth detection unit 6, and marking device 7. DETAILED DESCRIPTION

[0084] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0085] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0086] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0087] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0088] In the description of the embodiments of the present application, the term "and / or" is merely to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0089] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0090] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0091] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application should be understood according to the specific circumstances. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0092] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of the battery, the demand of the market is also increasing.

[0093] In the production process of lithium battery pole piece, due to the reasons such as deviation abnormality, over roller parallelism problem, tension stability problem, pressure wheel parallelism problem, pressure wheel pressure problem, etc., the pole piece is prone to wrinkle abnormality. And the pole piece wrinkle will cause the battery self-discharge and other abnormalities, which has great safety risk.

[0094] In order to solve the problem of how to detect the crumpling abnormality in the production process of the pole piece, a plurality of detection units can be arranged at different positions, each detection unit detects different appearance and size, so as to cover all areas of the A and B surfaces of the pole piece after die cutting, and the crumpling abnormality of the pole piece is detected according to the detection information, so that the crumpling abnormality can be detected in the production process of the pole piece, thereby improving the safety of the battery, and the crumpling abnormality of the pole piece can be detected from the appearance shadow detection and size mutation detection, thereby improving the accuracy of defect detection.

[0095] In some embodiments, a pole piece defect detection system is provided, which comprises: a first detection unit, a second detection unit, a slitting device, a third detection unit, a fourth detection unit and a control device; the first detection unit is used to detect the appearance and size of the B surface of the pole piece after die cutting; the second detection unit is used to detect the appearance and size of the pole piece; the slitting device is used to slit the pole piece after die cutting to obtain first side pole piece and second side pole piece; the third detection unit is used to detect the appearance and size of the A surface of the first side pole piece; the fourth detection unit is used to detect the appearance and size of the A surface of the second side pole piece; the control device is used to detect the crumpling abnormality of the pole piece according to the detection information, wherein the detection information includes the appearance and size of the B surface of the pole piece after die cutting, the appearance and size of the pole piece, the appearance and size of the A surface of the first side pole piece and the appearance and size of the A surface of the second side pole piece, and the detection of the crumpling abnormality of the pole piece according to the detection information includes: appearance shadow detection of the pole piece according to the detection information to obtain appearance shadow detection result; and / or, size mutation detection of the pole piece according to the detection information to obtain size mutation detection result.

[0096] For the convenience of understanding, reference is made to FIG. 1, but the present application is not limited thereto. FIG. 1 is a schematic diagram of the projection position of each unit in the pole piece defect detection system on the A surface of the pole piece. As an example, in FIG. 1, the die cutting unit 1, the first detection unit 2, the second detection unit 3, the slitting device 4, the third detection unit 5 and the fourth detection unit 6 are arranged in the motion direction of the pole piece respectively when the pole piece is viewed from the A surface of the pole piece, wherein the motion direction of the pole piece is the motion direction of the pole piece in the production process of the pole piece.

[0097] In a specific implementation, the die cutting unit 1 is used to cut the pole piece into a preset shape by laser die cutting, and the preset shape can be preset. In the present embodiment, the die cutting unit 1 can be used for lug processing of the pole piece.

[0098] The first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 can be visual detectors (for example, Charge Coupled Device (CCD) cameras), laser detectors, and the like. For example, the visual detectors can detect a tab image to obtain detection information, and the laser detectors can obtain detection information by emitting a laser beam and detecting the reflection of the laser beam. The embodiments are not limited in this regard. The layout of the first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 mainly meets the following requirements: 1. A and B surface appearance defects, ensuring full coverage; 2. A and B surface size specifications, ensuring that all sizes can be detected directly or indirectly and calculated and output.

[0099] The first detection unit 2 is configured to detect the B surface appearance and the B surface size of the die-cut tab, wherein the B surface is the other surface of the tab corresponding to the A surface, the B surface appearance of the die-cut tab can include the B surface insulating area appearance and the film area appearance of the die-cut tab, and the B surface size of the die-cut tab can include the B surface first insulating area size B1, the B surface second insulating area size B5, and the B surface film area size B3. The embodiments are not limited in this regard.

[0100] The second detection unit 3 is configured to detect the tab appearance and the tab size of the die-cut tab, wherein the tab appearance of the die-cut tab can include the lug appearance and the tab appearance of the die-cut tab, and the tab size of the die-cut tab can include the A surface lug width size A6 and the B surface lug width size B6. Of course, since the second detection unit 3 captures the lug appearance and the tab appearance of the die-cut tab, it can also detect the excess material, damage defects, and the like in the lug and tab areas according to the lug appearance and the tab appearance of the die-cut tab captured by the second detection unit 3. The embodiments are not limited in this regard.

[0101] The slitting device 4 is configured to divide the die-cut tab into two to obtain a first side tab and a second side tab. Of course, according to actual needs, the first side can be defined as the inner side of the tab, and the second side can be defined as the outer side of the tab. The embodiments are not limited in this regard.

[0102] The third detection unit 5 is configured to detect the A surface appearance and the A surface size of the first side tab, wherein the A surface appearance of the first side tab can include the A surface insulating area appearance and the A surface film area appearance of the first side tab, and the A surface size of the first side tab can include the A surface insulating area size A1 and the A surface film area size A2 of the first side tab. The embodiments are not limited in this regard.

[0103] The fourth detection unit is configured to detect the A-face appearance and the A-face size of the second side tab, wherein the A-face appearance of the second side tab can include the A-face insulation area appearance and the A-face film area appearance of the second side tab, and the A-face size of the second side tab can include the A-face insulation area size A5 and the A-face film area size A4 of the second side tab, and the embodiment is not limited in this regard.

[0104] After the size information is obtained by the detection unit, other size information can also be calculated according to the size information, for example, the first side offset value M of the tab is A1-B1; the second side offset value N of the tab is A5-B5; the B-face film area size B2 of the first side tab is A1+A2-B1; and the B-face film area size B4 of the second side tab is A4+A5-B5, and the embodiment is not limited in this regard.

[0105] The control device (not shown in FIG. 1) includes but is not limited to a programmable logic controller (PLC), and the controller can be connected to other units in the tab defect detection system through a preset communication mode, so as to obtain the information uploaded by the other units and control the other units, wherein the preset communication mode can be preset, for example, the preset communication mode can be a bus communication mode and a wireless communication mode, and the embodiment is not limited in this regard. In specific implementation, after obtaining the detection information uploaded by the detection unit, the control device can analyze the detection information and perform a wrinkling abnormality detection on the tab according to the analysis result. The analysis of the detection information can be performed by a preset image detection model, and the preset image detection model can be a pre-trained convolutional neural network model or other deep learning model, and the embodiment is not limited in this regard. The wrinkling abnormality detection on the tab according to the analysis result can be to detect a suspected wrinkling area on the tab according to the analysis result, and the suspected wrinkling area can be an area where a wrinkling defect occurs on the tab.

[0106] The tab height of the wrinkling area will change, and phenomena such as surface powder falling will also occur, resulting in a shadow area in the camera imaging, and the gray value of the wrinkling area will be different from that of other areas of the tab. Therefore, in the embodiment, appearance shadow detection can be performed on the tab. In specific implementation, the appearance shadow detection can be performed on the tab according to the B-face appearance of the die-cut tab, the tab appearance, the A-face appearance of the first side tab, and the A-face appearance of the second side tab.

[0107] The width of the fold area and the film width will have a certain range of mutations, so in this embodiment, the size mutation of the pole piece can also be detected. For ease of understanding, reference is made to FIG. 1, but this does not limit the present application. As an example, the size mutation of the pole piece can be detected according to the insulating area size, the film area size, the pole width size, and the AB surface misalignment size, wherein the insulating area size can include the A surface insulating area size A1 of the first side pole piece, the A surface insulating area size A5 of the second side pole piece, the B surface first insulating area size B1 of the pole piece after die cutting, and the B surface second insulating area size B5 of the pole piece after die cutting; the film area size can include the A surface film area size A2 of the first side pole piece, the A surface film area size A4 of the second side pole piece, the B surface film area size of the first side pole piece, and the B surface film area size B4 of the second side pole piece; the pole width size can include the A surface pole width size A6 and the B surface pole width size B6 of the pole piece after die cutting; and the AB surface misalignment size can include the first side misalignment value M of the pole piece and the second side misalignment value of the pole piece.

[0108] In this embodiment, a plurality of detection units are arranged at different positions, each detection unit detects different appearance and size, so as to cover all areas of the A and B surfaces of the pole piece after die cutting, and the pole piece is detected for crimping abnormality according to the detection information, so that the crimping abnormality can be detected in the production process of the pole piece, thereby improving the safety of the battery. In addition, in this embodiment, the pole piece is detected for crimping abnormality from two aspects of appearance shadow detection and size mutation detection, so that the accuracy of defect detection can be improved.

[0109] In some embodiments, the control device is further configured to obtain a film area and a shadow area of the pole piece according to the detection information, and calculate a gray value difference between the shadow area and the film area; when the gray value difference is greater than a preset gray value difference, obtain an area size and an area length of the shadow area; and when the area size meets a preset area size and the area length is greater than a preset length, determine that the shadow area is a suspected crimping area.

[0110] In order to improve the accuracy of appearance shadow detection, in this embodiment, whether the shadow area is a suspected crimping area is determined according to the gray value difference between the shadow area and the film area, and the area size and the area length of the shadow area.

[0111] In a specific implementation, the average gray value Y of each frame of appearance picture (the appearance of the B face of the post-cut polar piece, the appearance of the polar piece, the appearance of the A face of the first side polar piece, and the appearance of the A face of the second side polar piece) in the film area region is calculated first, then the gray value Z of each frame of appearance picture in the shadow area is calculated, then the absolute value |X| of the difference between the gray value Z of the shadow area and the average gray value Y of the film area region is calculated, if |X|>の, then the area area and the area length of the shadow area are calculated, and if the area area meets the preset area and the area length is greater than the preset length, it is determined that the shadow area is a suspected wrinkle area, and the position of the suspected wrinkle area is recorded, wherein の is a preset gray value difference.

[0112] According to the gray value difference between the shadow area and the film area region, and the area area and the area length of the shadow area, the embodiment determines whether the shadow area is a suspected wrinkle area, thereby improving the accuracy of appearance shadow detection, and further improving the accuracy of defect detection.

[0113] In some embodiments, the control device is further configured to calculate a polar width difference and a film width difference between adjacent target regions according to the detection information, wherein the target region is a region between adjacent tab ears; and determine that a middle region between the adjacent target regions is a suspected wrinkle region when the polar width difference is in a preset first difference interval and the film width difference is in a preset second difference interval.

[0114] In order to improve the accuracy of size mutation detection, in the embodiment, whether the polar width difference and the film width difference between adjacent target regions have size mutation is used to detect whether a middle region between the adjacent target regions is a suspected wrinkle region.

[0115] The Mark hole can be a starting mark of an EA, and an EA is used to represent the length of a polar piece wound into an electric core. For ease of understanding, reference is made to FIG. 2, but the present application is not limited thereto. FIG. 2 is a schematic view of Mark holes on the A face of a polar piece. In FIG. 2, the polar piece region between Mark hole 1 and Mark hole 2 is an EA, and one EA can be wound into an electric core.

[0116] In a specific implementation, a fixed area under a tab (as a reference) in each frame of picture is patrolled, and then the insulation area size, the film width size, and the pole width size of each knife (each two tab areas) are calculated, wherein the insulation area size can include the A-face insulation area size A1 of the first side tab, the A-face insulation area size A5 of the second side tab, the B-face first insulation area size B1 of the tab after die cutting, and the B-face second insulation area size B5 of the tab after die cutting; the film area size can include the A-face film area size A2 of the first side tab, the A-face film area size A4 of the second side tab, the B-face film area size of the first side tab, and the B-face film area size B4 of the second side tab; the pole width size can include the A-face pole width size A6 and the B-face pole width size B6 of the tab after die cutting, (the winding electric core, with EA, the fixed tab number in each EA, and the distance between each tab are different, the distance between the first and second tabs in the EA can be referred to as the first knife, and the last knife can be referred to as the Nth knife) the pole width and film width values (the pole width Ln and the film width Dn, n∈N) of the nth knife picture are measured, the pole width and film width values (the pole width Ln+1 and the film width Dn+1) of the n+1th knife picture are measured; when the upper limit set value>Ln+1-Ln>the lower limit set value, and the upper limit set value>Dn+1-Dn>the lower limit set value, it is judged that the area is a suspected tab wrinkle area.

[0117] The embodiment detects whether an intermediate area between adjacent target areas is a suspected wrinkle area according to whether the pole width difference and the film width difference between the adjacent target areas have a size mutation, so that the accuracy of size mutation detection can be improved, and the accuracy of defect detection can be further improved.

[0118] In some embodiments, the tab defect detection system further comprises an alarm device; the control device is further configured to control the tab production device to stop when the appearance shadow detection result or the size mutation detection result is that a suspected wrinkle area is detected, and generate an alarm instruction; and the alarm device is configured to receive the alarm instruction and alarm according to the alarm instruction.

[0119] In order to timely inform the user when a suspected wrinkle area is detected, in the embodiment, the tab defect detection system further comprises an alarm device, which alarms when the appearance shadow detection result or the size mutation detection result is that a suspected wrinkle area is detected.

[0120] For ease of understanding, the following is an example, but does not limit the present application. As an example, the alarm logic is as follows:

[0121] a. When the appearance shadow detection result of the current EA is that a suspected wrinkle area is detected, the control device controls the tab production equipment to stop and generates an alarm instruction, the alarm device receives the alarm instruction and alarms according to the alarm instruction, and the user can determine whether the suspected wrinkle area is a real defect by checking the picture or the real object after receiving the alarm; if so, the bad product is marked at the fixed area of the current EA or the current EA is directly pulled off and the tape is reconnected.

[0122] b. When the size mutation detection result of the current EA is that only one detection unit detects a suspected wrinkle area, the control device controls the tab production equipment to stop and generates an alarm instruction, the alarm device receives the alarm instruction and alarms according to the alarm instruction, and the user can determine whether the suspected wrinkle area is a real defect by checking the picture or the real object after receiving the alarm; if so, the bad product is marked at the fixed area of the current EA or the current EA is directly pulled off and the tape is reconnected.

[0123] c. When the suspected wrinkle area penetrates through multiple tab ear spacings, the control device controls the tab production equipment to stop and generates an alarm instruction, the alarm device receives the alarm instruction and alarms according to the alarm instruction, and the user can determine whether the suspected wrinkle area is a real defect by checking the picture or the real object after receiving the alarm; if so, the bad product is marked at the fixed area of the current EA or the current EA is directly pulled off and the tape is reconnected.

[0124] In the embodiment, the tab defect detection system further comprises an alarm device, which alarms when the appearance shadow detection result or the size mutation detection result is that a suspected wrinkle area is detected, so that the user can be notified in time when a suspected wrinkle area is detected.

[0125] In some embodiments, the tab defect detection system further comprises a marking device; the control device is further configured to generate a marking instruction and send the marking instruction to the marking device when the appearance shadow detection result and the size mutation detection result are both that a suspected wrinkle area is detected; and the marking device is configured to mark the bad product at the corresponding position of the tab according to the marking instruction.

[0126] Considering that the appearance shadow detection result and the size mutation detection result are both that a suspected wrinkle area is detected, the suspected wrinkle area is usually a real defect. Therefore, in the embodiment, when the appearance shadow detection result and the size mutation detection result are both that a suspected wrinkle area is detected, a marking instruction is directly generated and sent to the marking device, and the marking device marks the bad product at the corresponding position of the tab according to the marking instruction, wherein the marking device can be a marking machine, the marking machine is used for automatically marking the EA with defects, and the corresponding position of the tab can be a fixed position on the tab, which is not limited in the embodiment.

[0127] For ease of understanding, reference is made to FIG. 3, but the present application is not limited thereto. FIG. 3 is a schematic diagram of the projection position of the marking device on the A surface of the pole piece in the pole piece defect detection system. As an example, when the size mutation detection result of the current EA and the size mutation detection result are both detected as a suspected crease area, the control device generates a marking instruction and sends the marking instruction to the marking device 7. The marking device 7 performs bad product marking at the fixed position of the pole piece according to the marking instruction.

[0128] In the present embodiment, when the appearance shadow detection result and the size mutation detection result are both detected as a suspected crease area, the bad product marking is directly performed on the corresponding position of the pole piece by the marking device, so that the defective EA can be marked in time during the production of the pole piece, so that the user can continue the subsequent processing, and thus the yield and efficiency of the production of the pole piece can be improved.

[0129] In some embodiments, the control device is further configured to generate a marking instruction and send the marking instruction to the marking device when the appearance shadow detection result and the size mutation detection result of the first roll of pole pieces are both detected as a suspected crease area, and the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is detected as a suspected crease area, wherein the first roll of pole pieces and the second roll of pole pieces are adjacent pole pieces, the first roll of pole pieces are used to roll into a first electric core, and the second roll of pole pieces are used to roll into a second electric core; and the marking device is configured to perform bad product marking on the corresponding position of the first roll of pole pieces and the corresponding position of the second roll of pole pieces according to the marking instruction.

[0130] Considering that the crease defect appears continuously on two adjacent EAs, when the Nth knife of the first EA satisfies that the appearance shadow detection result and the size mutation detection result are both detected as a suspected crease area, and the 1st knife of the second EA satisfies that the appearance shadow detection result or the size mutation detection result is detected as a suspected crease area, the marking device performs bad product marking on the fixed position of the first EA and the second EA according to the marking instruction.

[0131] In the present embodiment, when the crease defect appears continuously, the marking condition of the continuous EA is relaxed. When the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is detected as a suspected crease area, the bad product marking is performed on the corresponding position of the first roll of pole pieces and the corresponding position of the second roll of pole pieces by the marking device, so that the accuracy of the crease defect detection can be improved, and thus the bad product marking of the defective EA can be performed in time.

[0132] In some embodiments, the control device is further configured to, when the size mutation detection result is that a suspected crease area is detected and the pole width difference between adjacent target areas is equal to the film width difference, calculate a pole width mutation of the pole piece according to the pole width information, wherein the target area is an area between adjacent pole tabs; when the pole width mutation is equal to the pole width difference, generate a marking instruction and send the marking instruction to the marking device; and the marking device is configured to mark the defective product at the corresponding position of the pole piece according to the marking instruction.

[0133] When the detection units at multiple different positions all detect the same size mutation, the suspected crease area is usually a real defect. Therefore, in this embodiment, when the size mutation detection result is that a suspected crease area is detected and the pole width difference between adjacent target areas is equal to the film width difference, and the pole width mutation is equal to the pole width difference, the marking device is directly used to mark the defective product at the corresponding position of the pole piece.

[0134] For ease of understanding, reference is made to FIG. 3, but the present application is not limited thereto. FIG. 3 is a schematic diagram of the projection position of the marking device on the A surface of the pole piece in the pole piece defect detection system. As an example, when the B surface size of the die-cut pole piece obtained according to the first detection unit 2 detects a suspected crease area, wherein the mutation of B6 is equal to the mutation of B3, and the other second detection unit 3 detects the A surface pole width size A6 and the B surface pole width size B6 of the die-cut pole piece, and the mutation amount is equal to that of the first detection unit 2, the marking device 7 can be directly used to mark the current EA for the automatic defective product marking of the crease defect.

[0135] In this embodiment, when the size mutation detection result is that a suspected crease area is detected and the pole width difference between adjacent target areas is equal to the film width difference, and the pole width mutation is equal to the pole width difference, the marking device is directly used to mark the defective product at the corresponding position of the pole piece, thereby improving the accuracy of the crease defect detection and further enabling the timely defective product marking of the defect EA.

[0136] In some embodiments, the control device is further configured to obtain the setting position of the detection unit that detects the crease defect and obtain the setting position of the detection unit that does not detect the crease defect; and position the crease defect according to the setting position of the detection unit that detects the crease defect and the setting position of the detection unit that does not detect the crease defect.

[0137] In order to accurately position the crease defect, in this embodiment, the crease defect is positioned according to the setting position of the detection unit that detects the crease defect and the setting position of the detection unit that does not detect the crease defect.

[0138] For ease of understanding, reference is made to FIG. 1, but the present application is not limited thereto. In FIG. 1, as an example, the defect positioning can include the following cases:

[0139] a、When the first detection unit 2 detects the creasing defect, and the second detection unit 3, the third detection unit 5 or the fourth detection unit 6 also detects the creasing defect, it can be judged that the defect is generated before the first detection unit 2, and the source of the creasing can be investigated and solved from the source;

[0140] b、When the second detection unit 3 detects the creasing defect, and the third detection unit 5 or the fourth detection unit 6 also detects the creasing defect, it can be judged that the defect is generated between the first detection unit 2 and the second detection unit 3;

[0141] c、When the third detection unit 5 or the fourth detection unit 6 detects the creasing defect, it is reported to stop at this time, and the staff confirms whether it is a real creasing defect, and it can be judged that the defect is generated after the second detection unit 3 and before the third detection unit 5 or the fourth detection unit 6.

[0142] The embodiment can locate the creasing defect according to the setting position of the detection unit detecting the creasing defect and the setting position of the detection unit not detecting the creasing defect, so as to accurately locate the creasing defect, and further improve the accuracy of the pole piece defect detection.

[0143] In some embodiments, as shown in FIG. 4, a pole piece defect detection method is provided, which comprises:

[0144] Step S10: detecting the B surface appearance and B surface size of the die-cut pole piece by the first detection unit.

[0145] For ease of understanding, reference is made to FIG. 1, but the present application is not limited thereto. FIG. 1 is a schematic diagram of the projection position of each unit in the pole piece defect detection system on the A surface of the pole piece. As an example, in FIG. 1, the die-cutting unit 1, the first detection unit 2, the second detection unit 3, the slitting device 4, the third detection unit 5 and the fourth detection unit 6 are arranged in the pole piece motion direction respectively when the pole piece is viewed from the A surface of the pole piece, wherein the pole piece motion direction is the pole piece motion direction in the pole piece generation process.

[0146] In a specific implementation, the die-cutting unit 1 is configured to cut the pole piece into a preset shape by laser die-cutting. The preset shape can be pre-set, and in the embodiment, the die-cutting unit 1 can be configured to process the pole piece into a pole lug.

[0147] The first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 can be visual detectors (for example, Charge Coupled Device (CCD) cameras), laser detectors, and the like. For example, the visual detectors can detect the tab image to obtain the detection information, and the laser detectors can obtain the detection information by emitting a laser beam and detecting the reflection of the laser beam. The embodiments are not limited in this regard. The layout of the first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 mainly meets the following requirements: 1. A and B surface appearance defects, ensuring full coverage; 2. A and B surface size specifications, ensuring that all sizes can be detected directly or indirectly and calculated and output.

[0148] The first detection unit 2 is configured to detect the B surface appearance and the B surface size of the die-cut tab, wherein the B surface is the other surface of the tab corresponding to the A surface, the B surface appearance of the die-cut tab can include the B surface insulating area appearance and the film area appearance of the die-cut tab, and the B surface size of the die-cut tab can include the B surface first insulating area size B1, the B surface second insulating area size B5, and the B surface film area size B3. The embodiments are not limited in this regard.

[0149] In step S20, the tab appearance and the tab size of the die-cut tab are detected by the second detection unit.

[0150] The second detection unit 3 is configured to detect the tab appearance and the tab size of the die-cut tab, wherein the tab appearance of the die-cut tab can include the lug appearance and the tab appearance of the die-cut tab, and the tab size of the die-cut tab can include the A surface lug width size A6 and the B surface lug width size B6. Of course, since the second detection unit 3 captures the lug appearance and the tab appearance of the die-cut tab, the second detection unit 3 can also detect the excess material, damage defects, and the like in the lug and tab areas according to the lug appearance and the tab appearance of the die-cut tab captured by the second detection unit 3. The embodiments are not limited in this regard.

[0151] In step S30, the A surface appearance and the A surface size of the first side tab are detected by the third detection unit, wherein the first side tab is one side tab of the die-cut tab after being cut, and the second side tab is the other side tab of the die-cut tab after being cut.

[0152] The cutting device 4 is configured to divide the die-cut tab into two to obtain the first side tab and the second side tab. Of course, according to actual needs, the first side can be defined as the inner side of the tab, and the second side can be defined as the outer side of the tab. The embodiments are not limited in this regard.

[0153] The third detection unit 5 is configured to detect the A-face appearance and the A-face size of the first side tab, wherein the A-face appearance of the first side tab can include the A-face insulation area appearance and the A-face film area appearance of the first side tab, and the A-face size of the first side tab can include the A-face insulation area size A1 and the A-face film area size A2 of the first side tab, and the present embodiment is not limited in this regard.

[0154] Step S40: detecting the A-face appearance and the A-face size of the second side tab by the fourth detection unit.

[0155] The fourth detection unit is configured to detect the A-face appearance and the A-face size of the second side tab, wherein the A-face appearance of the second side tab can include the A-face insulation area appearance and the A-face film area appearance of the second side tab, and the A-face size of the second side tab can include the A-face insulation area size A5 and the A-face film area size A4 of the second side tab, and the present embodiment is not limited in this regard.

[0156] After the above-mentioned size information is obtained by the above-mentioned detection unit, other size information can also be obtained according to the above-mentioned size information, for example, the first side tab offset value M = A1-B1; the second side tab offset value N = A5-B5; the B-face film area size B2 of the first side tab = A1+A2-B1; the B-face film area size B4 of the second side tab = A4+A5-B5, and the present embodiment is not limited in this regard.

[0157] Step S50: performing the wrinkling abnormality detection on the tab according to the detection information, wherein the detection information includes the B-face appearance, the B-face size, the tab appearance, the tab size, the A-face appearance and the A-face size of the first side tab, and the A-face appearance and the A-face size of the second side tab of the tab after the die cutting, and the performing the wrinkling abnormality detection on the tab according to the detection information includes: performing the appearance shadow detection on the tab according to the detection information to obtain the appearance shadow detection result; and / or, performing the size mutation detection on the tab according to the detection information to obtain the size mutation detection result.

[0158] The control device (not shown in FIG. 1) includes but is not limited to a programmable logic controller (PLC), and the controller can be connected with other units in the pole piece defect detection system through a preset communication mode to obtain information uploaded by the other units and control the other units, where the preset communication mode can be preset, for example, the preset communication mode can be a bus communication mode and a wireless communication mode, etc., and the embodiment is not limited thereto. In specific implementation, after obtaining the detection information uploaded by the detection unit, the control device can analyze the detection information and perform a crimping abnormality detection on the pole piece according to the analysis result. Wherein, the analysis of the detection information can be performed by a preset image detection model, and the preset image detection model can be a pre-trained convolutional neural network model or other deep learning model, and the embodiment is not limited thereto. The crimping abnormality detection on the pole piece according to the analysis result can be to detect a suspected crease area on the pole piece according to the analysis result, and the suspected crease area can be an area where a crimping defect occurs on the pole piece.

[0159] The pole piece height of the crease area will change, and phenomena such as surface powder falling will also occur, resulting in a shadow area in the camera imaging, and the gray value of the pole piece in the other area will be different. Therefore, in the embodiment, appearance shadow detection can be performed on the pole piece. In specific implementation, appearance shadow detection can be performed on the pole piece according to the appearance of the B surface of the die-cut pole piece, the appearance of the pole piece, the appearance of the A surface of the first side pole piece, and the appearance of the A surface of the second side pole piece.

[0160] The pole width and film width of the crease area will have a certain range of mutations, and therefore, in the embodiment, size mutation detection can also be performed on the pole piece. For ease of understanding, reference is made to FIG. 1, but the present application is not limited thereto. As an example, size mutation detection can be performed on the pole piece according to the insulation area size, the film area size, the pole width size, and the AB surface misalignment size, where the insulation area size can include the A surface insulation area size A1 of the first side pole piece, the A surface insulation area size A5 of the second side pole piece, the B surface first insulation area size B1 of the die-cut pole piece, and the B surface second insulation area size B5 of the die-cut pole piece; the film area size can include the A surface film area size A2 of the first side pole piece, the A surface film area size A4 of the second side pole piece, the B surface film area size of the first side pole piece, and the B surface film area size B4 of the second side pole piece; the pole width size can include the A surface pole width size A6 and the B surface pole width size B6 of the die-cut pole piece; and the AB surface misalignment size can include the first side misalignment value M of the pole piece and the second side misalignment value of the pole piece.

[0161] The embodiment sets multiple detection units at different positions, each detection unit detects different appearance and size, so as to cover all areas of the polar piece A and B after die cutting, and detects the wrinkling abnormality of the polar piece according to the detection information, so as to detect the wrinkling abnormality in the production process of the polar piece, and further improve the safety of the battery. And since the embodiment also detects the wrinkling abnormality of the polar piece from the aspects of appearance shadow detection and size mutation detection, the accuracy of defect detection can be improved.

[0162] In some embodiments, after the step S50, the method further comprises:

[0163] When the appearance shadow detection result or the size mutation detection result is that a suspected wrinkling area is detected, the polar piece production equipment is controlled to stop, and an alarm instruction is generated, and an alarm device is controlled to alarm based on the alarm instruction.

[0164] In order to timely inform the user when a suspected wrinkling area is detected, in the embodiment, the polar piece defect detection system further comprises an alarm device, and when the appearance shadow detection result or the size mutation detection result is that a suspected wrinkling area is detected, the alarm device alarms.

[0165] For the convenience of understanding, the following is illustrated by way of example, but does not limit the present application. As an example, the alarm logic is as follows:

[0166] a. When the appearance shadow detection result of the current EA is that a suspected wrinkling area is detected, the equipment is controlled to control the polar piece production equipment to stop, and an alarm instruction is generated, the alarm device receives the alarm instruction, and alarms according to the alarm instruction, the user can determine whether the suspected wrinkling area is a real defect by checking the picture or the real object after receiving the alarm; if so, the bad product is marked at the fixed area of the current EA or the current EA is directly pulled out and reconnected.

[0167] b. When the size mutation detection result of the current EA is that only one detection unit detects a suspected wrinkling area, the equipment is controlled to control the polar piece production equipment to stop, and an alarm instruction is generated, the alarm device receives the alarm instruction, and alarms according to the alarm instruction, the user can determine whether the suspected wrinkling area is a real defect by checking the picture or the real object after receiving the alarm; if so, the bad product is marked at the fixed area of the current EA or the current EA is directly pulled out and reconnected.

[0168] c. When the suspected crease area is detected in the multiple tab spacing, the control device controls the tab production device to stop, and generates an alarm instruction. The alarm device receives the alarm instruction and alarms according to the alarm instruction. The user can determine whether the suspected crease area is a real defect by checking the picture or the real object after receiving the alarm. If yes, the defective product is marked at the fixed area of the current EA or the current EA is directly pulled out and the tape is reconnected.

[0169] In this embodiment, the tab defect detection system further comprises an alarm device. When the appearance shadow detection result or the size mutation detection result is a suspected crease area, the alarm device alarms, so that the user can be notified in time when the suspected crease area is detected.

[0170] In some embodiments, after the step S50, the method further comprises: when the appearance shadow detection result and the size mutation detection result are both suspected crease areas, generating a marking instruction; and marking the defective product at the corresponding position of the tab by the marking device according to the marking instruction.

[0171] When the appearance shadow detection result and the size mutation detection result are both suspected crease areas, the suspected crease area is usually a real defect. Therefore, in this embodiment, when the appearance shadow detection result and the size mutation detection result are both suspected crease areas, a marking instruction is directly generated and sent to the marking device. The marking device marks the defective product at the corresponding position of the tab according to the marking instruction. The marking device can be a marking machine, which is used for automatic marking of the EA with defects. The corresponding position of the tab can be a fixed position on the tab, which is not limited in this embodiment.

[0172] For ease of understanding, reference is made to FIG. 3, but the present application is not limited thereto. FIG. 3 is a schematic diagram of the projection position of the marking device in the tab defect detection system on the A surface of the tab. As an example, when the size mutation detection result and the size mutation detection result of the current EA are both suspected crease areas, the control device generates a marking instruction and sends the marking instruction to the marking device 7. The marking device 7 marks the defective product at the fixed position of the tab according to the marking instruction.

[0173] In this embodiment, when the appearance shadow detection result and the size mutation detection result are both suspected crease areas, the defective product is directly marked at the corresponding position of the tab by the marking device, so that the defective EA can be marked in time during the tab production process, so that the user can continue the subsequent processing, and thus the yield and efficiency of the tab production can be improved.

[0174] In some embodiments, after the step S50, the method further comprises: when the appearance shadow detection result and the size mutation detection result of the first jelly-roll sheet are both detected as a suspected crease area, and the appearance shadow detection result or the size mutation detection result of the second jelly-roll sheet is detected as a suspected crease area, generating a marking instruction, wherein the first jelly-roll sheet and the second jelly-roll sheet are adjacent jelly-roll sheets, the first jelly-roll sheet is used to roll into a first battery cell, and the second jelly-roll sheet is used to roll into a second battery cell; and performing bad product marking on the corresponding position of the first jelly-roll sheet and the corresponding position of the second jelly-roll sheet by a marking device according to the marking instruction.

[0175] Considering that the crease defect appears continuously on two adjacent EAs, when the Nth knife of the first EA satisfies both the appearance shadow detection result and the size mutation detection result, and the 1st knife of the second EA satisfies the appearance shadow detection result or the size mutation detection result, a marking device performs bad product marking on the fixed positions of the first EA and the second EA according to a marking instruction.

[0176] In this embodiment, when the crease defect appears continuously, the marking condition of the continuous EA is relaxed, and when the appearance shadow detection result or the size mutation detection result of the second jelly-roll sheet is detected as a suspected crease area, bad product marking is performed on the corresponding position of the first jelly-roll sheet and the corresponding position of the second jelly-roll sheet by a marking device, so as to improve the accuracy of crease defect detection, and further to timely mark the defective EA as a bad product.

[0177] In some embodiments, after the step S50, the method further comprises: when the size mutation detection result is detected as a suspected crease area, and the jelly width difference between adjacent target areas is equal to the film width difference, calculating a jelly width mutation of the jelly sheet according to the jelly width information, wherein the target area is the area between adjacent tabs; generating a marking instruction when the jelly width mutation is equal to the jelly width difference; and performing bad product marking on the corresponding position of the jelly sheet by a marking device according to the marking instruction.

[0178] Considering that the same size mutation is detected by multiple detection units at different positions, the suspected crease area is usually a real defect. Therefore, in this embodiment, when the size mutation detection result is detected as a suspected crease area, and the jelly width difference between adjacent target areas is equal to the film width difference, and the jelly width mutation is equal to the jelly width difference, bad product marking is directly performed on the corresponding position of the jelly sheet by a marking device.

[0179] For ease of understanding, reference is made to FIG. 3, but the present application is not limited thereto. FIG. 3 is a schematic diagram of a projection position of a marking device on the A surface of the pole piece in the pole piece defect detection system. As an example, when a suspected crease area is detected on the B surface of the post-cut pole piece according to the detection result of the first detection unit 2, the mutation of B6 = the mutation of B3, and other second detection units 3 detect the A surface pole width size A6 and the B surface pole width size B6 of the post-cut pole piece, and the mutation amount is equal to the mutation amount of the first detection unit 2, the automatic defective marking of the current EA can be directly marked by the marking device 7.

[0180] In the embodiment, when the size mutation detection result is that a suspected crease area is detected, the pole width difference between adjacent target areas is equal to the film width difference, and the pole width mutation is equal to the pole width difference, the defective marking is directly performed on the corresponding position of the pole piece by the marking device, so that the accuracy of the crease defect detection can be improved, and the defective marking of the defective EA can be performed in time.

[0181] In some embodiments, as shown in FIG. 5, a pole piece defect detection method is provided, which comprises:

[0182] Step S10': obtaining the appearance of the B surface of the post-cut pole piece, the size of the B surface, the appearance of the pole piece, and the size of the pole piece.

[0183] The execution subject of the embodiment can be a control device with data processing, network communication, and program running functions, such as an upper computer or the like, or other electronic devices capable of achieving the same or similar functions, which are not limited in the embodiment. The control device belongs to the pole piece defect detection system, and the control device includes but is not limited to a programmable logic controller (PLC). The controller can be connected to other units in the pole piece defect detection system through a preset communication mode, so as to obtain information uploaded by the other units and control the other units. The preset communication mode can be preset, for example, the preset communication mode can be a bus communication mode and a wireless communication mode, and the like, which are not limited in the embodiment.

[0184] For ease of understanding, reference is made to FIG. 1, but the present application is not limited thereto. FIG. 1 is a schematic diagram of the projection position of each unit on the A surface of the pole piece in the pole piece defect detection system. As an example, in FIG. 1, when the pole piece is viewed from the A surface of the pole piece, the post-cut unit 1, the first detection unit 2, the second detection unit 3, the cutting device 4, the third detection unit 5, and the fourth detection unit 6 are arranged in the pole piece movement direction, respectively. The pole piece movement direction is the movement direction of the pole piece in the pole piece generation process.

[0185] In a specific implementation, the die-cutting unit 1 is configured to cut the pole piece into a preset shape by laser die-cutting. The preset shape can be preset, and in this embodiment, the die-cuting unit 1 can be configured to process the pole piece into a tab.

[0186] The first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 can be a visual detector (for example, a charge coupled device (CCD) camera), a laser detector, etc. For example, the visual detector can detect a pole piece image to obtain detection information, and the laser detector can obtain detection information by emitting a laser beam and detecting the reflection of the laser beam. The present embodiment does not limit this. The layout of the first detection unit 2, the second detection unit 3, the third detection unit 5, and the fourth detection unit 6 mainly meets the following requirements: 1. A and B surface appearance defects, ensuring full coverage; 2. A and B surface size specifications, ensuring that all sizes can be detected directly or indirectly and calculated and output.

[0187] The first detection unit 2 is configured to detect the B surface appearance and the B surface size of the die-cutting pole piece. The B surface of the die-cutting pole piece corresponds to the other surface of the A surface. The B surface appearance of the die-cutting pole piece can include the B surface insulation area appearance and the film area appearance of the die-cutting pole piece. The B surface size of the die-cutting pole piece can include the B surface first insulation area size B1, the B surface second insulation area size B5, and the B surface film area size B3. The present embodiment does not limit this.

[0188] In step S20', the A surface appearance and the A surface size of the first side pole piece and the A surface appearance and the A surface size of the second side pole piece are obtained. The first side pole piece is one side pole piece obtained by slitting the die-cutting pole piece, and the second side pole piece is the other side pole piece obtained by slitting the pole piece.

[0189] The second detection unit 3 is configured to detect the pole piece appearance and the pole piece size of the die-cutting pole piece. The pole piece appearance of the die-cutting pole piece can include the tab appearance and the pole piece appearance of the die-cutting pole piece. The pole piece size of the die-cutting pole piece can include the A surface tab width size A6 and the B surface tab width size B6. Of course, since the second detection unit 3 obtains the tab appearance and the pole piece appearance of the die-cutting pole piece by shooting, it can also detect the excess material, damage defects, etc. of the tab and the pole piece area according to the tab appearance and the pole piece appearance of the die-cutting pole piece obtained by shooting of the second detection unit 3. The present embodiment does not limit this.

[0190] The slitting device 4 is configured to divide the die-cutting pole piece into two to obtain the first side pole piece and the second side pole piece. Of course, according to actual needs, the first side can be defined as the inner side of the pole piece, and the second side can be defined as the outer side of the pole piece. The present embodiment does not limit this.

[0191] The third detection unit 5 is configured to detect the A-face appearance and the A-face size of the first side tab, wherein the A-face appearance of the first side tab can include the A-face insulation area appearance and the A-face film area appearance of the first side tab, and the A-face size of the first side tab can include the A-face insulation area size A1 and the A-face film area size A2 of the first side tab, and the present embodiment is not limited in this regard.

[0192] The fourth detection unit is configured to detect the A-face appearance and the A-face size of the second side tab, wherein the A-face appearance of the second side tab can include the A-face insulation area appearance and the A-face film area appearance of the second side tab, and the A-face size of the second side tab can include the A-face insulation area size A5 and the A-face film area size A4 of the second side tab, and the present embodiment is not limited in this regard.

[0193] Step S30': performing a crimping abnormality detection on the tab according to the detection information, wherein the detection information includes the B-face appearance, the B-face size, the tab appearance, the tab size, the A-face appearance and the A-face size of the first side tab, and the A-face appearance and the A-face size of the second side tab, and the performing a crimping abnormality detection on the tab according to the detection information includes: performing an appearance shadow detection on the tab according to the detection information to obtain an appearance shadow detection result; and / or performing a size mutation detection on the tab according to the detection information to obtain a size mutation detection result.

[0194] After obtaining the detection information from the above detection units, the control device can analyze the detection information and perform a crimping abnormality detection on the tab according to the analysis result. The analysis of the detection information can be performed by a preset image detection model, which can be a pre-trained convolutional neural network model or other deep learning model, and the present embodiment is not limited in this regard. The crimping abnormality detection on the tab according to the analysis result can be detecting a suspected crimping area on the tab according to the analysis result, which can be an area with a crimping defect on the tab.

[0195] The tab height of the crimping area will change, and surface powder will also appear, resulting in a shadow area in the camera imaging, which will have a difference in gray value from other areas of the tab. Therefore, in the present embodiment, an appearance shadow detection can be performed on the tab. In a specific implementation, the appearance shadow detection can be performed on the tab according to the B-face appearance of the post-cutting tab, the tab appearance, the A-face appearance of the first side tab, and the A-face appearance of the second side tab.

[0196] The width of the fold region and the film width can have a certain range of mutations, so in this embodiment, the size mutation of the pole piece can also be detected. For ease of understanding, reference is made to FIG. 1, but this does not limit the present application. As an example, the size mutation of the pole piece can be detected according to the insulating region size, the film region size, the pole width size, and the AB surface misregistration size, wherein the insulating region size can include the A surface insulating region size A1 of the first side pole piece, the A surface insulating region size A5 of the second side pole piece, the B surface first insulating region size B1 of the pole piece after die cutting, and the B surface second insulating region size B5 of the pole piece after die cutting; the film region size can include the A surface film region size A2 of the first side pole piece, the A surface film region size A4 of the second side pole piece, the B surface film region size of the first side pole piece, and the B surface film region size B4 of the second side pole piece; the pole width size can include the A surface pole width size A6 and the B surface pole width size B6 of the pole piece after die cutting; and the AB surface misregistration size can include the first side misregistration value M of the pole piece and the second side misregistration value of the pole piece.

[0197] In this embodiment, a plurality of detection units are arranged at different positions, each detection unit detects different appearance and size, so as to cover all areas of the A and B surfaces of the pole piece after die cutting, and the pole piece is detected for crimping abnormality according to the detection information, so that the crimping abnormality can be detected in the production process of the pole piece, thereby improving the safety of the battery. In addition, in this embodiment, the pole piece is detected for crimping abnormality from two aspects of appearance shadow detection and size mutation detection, thereby improving the accuracy of defect detection.

[0198] In some embodiments, as shown in FIG. 6, the step S30' includes:

[0199] Step S301': The film region area and the shadow area of the pole piece are obtained according to the detection information, and the gray value difference between the shadow area and the film region area is calculated.

[0200] In order to improve the accuracy of appearance shadow detection, in this embodiment, whether the shadow area is a suspected fold region is judged according to the gray value difference between the shadow area and the film region area, and the area area and the area length of the shadow area.

[0201] Step S302': When the gray value difference is greater than a preset gray value difference, the area area and the area length of the shadow area are obtained.

[0202] Step S303': When the area area meets a preset area and the area length is greater than a preset length, the shadow area is determined as a suspected fold region.

[0203] In a specific implementation, the average gray value Y of each frame of appearance picture (the appearance of the B face of the die-cut polar piece, the appearance of the polar piece, the appearance of the A face of the first side polar piece, and the appearance of the A face of the second side polar piece) in the film area region is calculated first, then the gray value Z of each frame of appearance picture in the shadow area is calculated, then the absolute value |X| of the difference between the gray value Z of the shadow area and the average gray value Y of the film area region is calculated, if |X|>の, then the area area and the area length of the shadow area are calculated, and if the area area meets the preset area and the area length is greater than the preset length, it is determined that the shadow area is a suspected wrinkle area, and the position of the suspected wrinkle area is recorded, wherein の is a preset gray value difference.

[0204] According to the gray value difference between the shadow area and the film area region, and the area area and the area length of the shadow area, the embodiment determines whether the shadow area is a suspected wrinkle area, thereby improving the accuracy of appearance shadow detection, and further improving the accuracy of defect detection.

[0205] In some embodiments, as shown in FIG. 7, the step S30' further includes:

[0206] Step S301": calculating the polar width difference and the film width difference between adjacent target regions according to the detection information, wherein the target region is the region between adjacent tab ears.

[0207] In order to improve the accuracy of size mutation detection, in the embodiment, whether the intermediate region between adjacent target regions is a suspected wrinkle region is detected according to whether the polar width difference and the film width difference between adjacent target regions have size mutations.

[0208] Step S302": determining that the intermediate region between the adjacent target regions is a suspected wrinkle region when the polar width difference is in a preset first difference interval and the film width difference is in a preset second difference interval.

[0209] The Mark hole can be a starting mark of an EA, and an EA is used to represent the length of a polar piece wound into an electric core. For ease of understanding, reference is made to FIG. 2, but the present application is not limited thereto. FIG. 2 is a schematic view of Mark holes on the A face of a polar piece. In FIG. 2, the polar piece region between Mark hole 1 and Mark hole 2 is an EA, and one EA can be wound into an electric core.

[0210] In a specific implementation, a fixed area below a tab (as a reference) appearing in each frame of picture is patrolled, and then the insulation area size, the film width size and the pole width size of each knife (each two tab areas) are calculated, wherein the insulation area size can include the A-face insulation area size A1 of the first side tab, the A-face insulation area size A5 of the second side tab, the B-face first insulation area size B1 of the tab after die cutting and the B-face second insulation area size B5 of the tab after die cutting; the film area size can include the A-face film area size A2 of the first side tab, the A-face film area size A4 of the second side tab, the B-face film area size of the first side tab and the B-face film area size B4 of the second side tab; the pole width size can include the A-face pole width size A6 and the B-face pole width size B6 of the tab after die cutting, (the winding electric core, EA is different, the number of fixed tabs in each EA is different, and the distance between the first and second tabs in the EA can be referred to as the first knife, and the last knife is referred to as the Nth knife) the pole width and film width values (the pole width Ln and the film width Dn, n∈N) of the nth knife picture are measured, the pole width and film width values (the pole width Ln+1 and the film width Dn+1) of the n+1th knife picture are measured; when the upper limit set value > Ln+1-Ln > the lower limit set value, and the upper limit set value > Dn+1-Dn > the lower limit set value, it is judged that the area is a suspected tab wrinkle area.

[0211] The embodiment detects whether the intermediate area between adjacent target areas is a suspected wrinkle area according to whether the size of the difference between the pole width and the film width of adjacent target areas suddenly changes, so that the accuracy of size mutation detection can be improved, and the accuracy of defect detection can be further improved.

[0212] In some embodiments, after the step S30', the method further includes: obtaining the setting positions of the detection units that detect the crumpling defects and obtaining the setting positions of the detection units that do not detect the crumpling defects; and positioning the crumpling defects according to the setting positions of the detection units that detect the crumpling defects and the setting positions of the detection units that do not detect the crumpling defects.

[0213] In order to accurately position the crumpling defects, in the embodiment, the crumpling defects are positioned according to the setting positions of the detection units that detect the crumpling defects and the setting positions of the detection units that do not detect the crumpling defects.

[0214] For ease of understanding, reference is made to FIG. 1, but the present application is not limited thereto. In FIG. 1, as an example, the defect positioning can include the following cases:

[0215] a. When the first detection unit 2 detects the crumpling defects and the second detection unit 3, the third detection unit 5 or the fourth detection unit 6 also detects the crumpling defects, it can be judged that the defects are generated before the first detection unit 2, and the source of the crumpling can be investigated and solved from the source;

[0216] b. When the second detection unit 3 detects a creasing defect, and the third detection unit 5 or the fourth detection unit 6 also detects a creasing defect, it can be determined that the defect is generated between the first detection unit 2 and the second detection unit 3;

[0217] c. When the third detection unit 5 or the fourth detection unit 6 detects a creasing defect, an alarm is given to stop the machine, and the staff confirms whether it is a real creasing defect. At this time, it can be determined that the defect is generated after the second detection unit 3 and before the third detection unit 5 or the fourth detection unit 6.

[0218] The embodiment can locate the creasing defect according to the setting position of the detection unit detecting the creasing defect and the setting position of the detection unit not detecting the creasing defect, so as to accurately locate the creasing defect, and further improve the accuracy of the defect detection of the pole piece.

[0219] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece defect detection system, wherein, The pole piece defect detection system comprises a first detection unit, a second detection unit, a slitting device, a third detection unit, a fourth detection unit, and a control device; The first detection unit is configured to detect the appearance and size of the B surface of the die-cut pole piece; The second detection unit is configured to detect the appearance and size of the pole piece of the die-cut pole piece; The slitting device is configured to slit the die-cut pole piece to obtain a first side pole piece and a second side pole piece; The third detection unit is configured to detect the appearance and size of the A surface of the first side pole piece; The fourth detection unit is configured to detect the appearance and size of the A surface of the second side pole piece; The control device is configured to perform a wrinkle abnormality detection on the pole piece according to detection information, wherein the detection information comprises the appearance and size of the B surface of the die-cut pole piece, the appearance and size of the pole piece, the appearance and size of the A surface of the first side pole piece, and the appearance and size of the A surface of the second side pole piece, the wrinkle abnormality detection on the pole piece according to the detection information comprises an appearance shadow detection on the pole piece according to the detection information to obtain an appearance shadow detection result, and / or a size mutation detection on the pole piece according to the detection information to obtain a size mutation detection result.

2. The pole piece defect detection system of claim 1, wherein, The control device is further configured to obtain a film area and a shadow area of the pole piece according to the detection information, calculate a gray value difference between the shadow area and the film area, obtain an area size and an area length of the shadow area when the gray value difference is greater than a preset gray value difference, and determine that the shadow area is a suspected wrinkle area when the area size meets a preset area size and the area length is greater than a preset length.

3. The pole piece defect detection system of claim 1, wherein, The control device is further configured to calculate a pole width difference and a film width difference between adjacent target areas according to the detection information, wherein the target area is an area between adjacent pole ears, and determine that a middle area between the adjacent target areas is a suspected wrinkle area when the pole width difference is within a preset first difference interval and the film width difference is within a preset second difference interval.

4. The pole piece defect detection system of claim 1, wherein, The pole piece defect detection system further comprises an alarm device; The control device is further configured to control a pole piece production device to stop working and generate an alarm instruction when the appearance shadow detection result or the size mutation detection result indicates that a suspected wrinkle area is detected; The alarm device is configured to receive the alarm instruction and perform an alarm according to the alarm instruction.

5. The pole piece defect detection system of claim 1, wherein, The pole piece defect detection system further comprises a marking device; The control device is further configured to generate a marking instruction and send the marking instruction to the marking device when the appearance shadow detection result and the size mutation detection result both indicate that a suspected wrinkle area is detected; The marking device is configured to mark a defective product at a corresponding position of the pole piece according to the marking instruction.

6. The pole piece defect detection system of claim 5, wherein, The control device is further configured to generate a marking instruction when the appearance shadow detection result and the size mutation detection result of the first jelly-roll sheet are both detected as a suspected crease area, and the appearance shadow detection result or the size mutation detection result of the second jelly-roll sheet is detected as a suspected crease area, and send the marking instruction to the marking device, wherein the first jelly-roll sheet and the second jelly-roll sheet are adjacent jelly-roll sheets, the first jelly-roll sheet is used to be rolled into a first battery cell, and the second jelly-roll sheet is used to be rolled into a second battery cell. The marking device is configured to mark the first jelly-roll sheet and the second jelly-roll sheet according to the marking instruction.

7. The pole piece defect detection system of claim 5, wherein, The control device is further configured to calculate a jelly-roll width mutation of the jelly-roll sheet according to the jelly-roll width information when the size mutation detection result is detected as a suspected crease area and the jelly-roll width difference between adjacent target areas is equal to the film width difference, wherein the target area is an area between adjacent tabs; generate a marking instruction when the jelly-roll width mutation is equal to the jelly-roll width difference, and send the marking instruction to the marking device. The marking device is configured to mark the jelly-roll sheet according to the marking instruction.

8. The pole piece defect detection system of any one of claims 1 to 7, wherein, The control device is further configured to obtain a setting position of a detection unit that detects a crease defect and a setting position of a detection unit that does not detect a crease defect, and locate the crease defect according to the setting position of the detection unit that detects the crease defect and the setting position of the detection unit that does not detect the crease defect.

9. A pole piece defect detection method, wherein, Comprising: detecting the B-face appearance and the B-face size of the post-die-cut jelly-roll sheet by a first detection unit; detecting the jelly-roll sheet appearance and the jelly-roll sheet size of the post-die-cut jelly-roll sheet by a second detection unit; detecting the A-face appearance and the A-face size of a first side jelly-roll sheet by a third detection unit, wherein the first side jelly-roll sheet is one side jelly-roll sheet after the post-die-cut jelly-roll sheet is cut, and a second side jelly-roll sheet is the other side jelly-roll sheet after the jelly-roll sheet is cut; detecting the A-face appearance and the A-face size of the second side jelly-roll sheet by a fourth detection unit; detecting a crease defect of the jelly-roll sheet according to detection information, wherein the detection information comprises the B-face appearance, the B-face size, the jelly-roll sheet appearance, the jelly-roll sheet size, the A-face appearance and the A-face size of the first side jelly-roll sheet, and the A-face appearance and the A-face size of the second side jelly-roll sheet, and the detecting the crease defect of the jelly-roll sheet according to the detection information comprises: detecting an appearance shadow of the jelly-roll sheet according to the detection information to obtain an appearance shadow detection result, and / or detecting a size mutation of the jelly-roll sheet according to the detection information to obtain a size mutation detection result.

10. The pole piece defect detection method of claim 9, wherein, After the detecting the crease defect of the jelly-roll sheet according to the detection information, the method further comprises: stopping a jelly-roll sheet production device and generating an alarm instruction when the appearance shadow detection result or the size mutation detection result is detected as a suspected crease area, and alarming by an alarm device based on the alarm instruction.

11. The pole piece defect detection method of claim 9, wherein, After the detecting the crease defect of the jelly-roll sheet according to the detection information, the method further comprises: generating a marking instruction when the appearance shadow detection result and the size mutation detection result are both detected as a suspected crease area. According to the marking instruction, bad product marking is performed on the corresponding position of the pole piece by a marking device.

12. The pole piece defect detection method of claim 11, wherein, After the pole piece is detected for the wrinkle abnormality according to the detection information, the method further includes: When the appearance shadow detection result and the size mutation detection result of the first roll of pole pieces are both detected as a suspected wrinkle area, and the appearance shadow detection result or the size mutation detection result of the second roll of pole pieces is detected as a suspected wrinkle area, a marking instruction is generated, wherein the first roll of pole pieces and the second roll of pole pieces are adjacent pole pieces, the first roll of pole pieces are used to be rolled into a first battery cell, and the second roll of pole pieces are used to be rolled into a second battery cell; According to the marking instruction, bad product marking is performed on the corresponding position of the first roll of pole pieces and the corresponding position of the second roll of pole pieces by a marking device.

13. The pole piece defect detection method of claim 11, wherein, After the pole piece is detected for the wrinkle abnormality according to the detection information, the method further includes: When the size mutation detection result is detected as a suspected wrinkle area, and the pole width difference between adjacent target areas is equal to the film width difference, the pole width mutation of the pole piece is calculated according to the pole width information, wherein the target area is the area between adjacent pole tabs. When the pole width mutation is equal to the pole width difference, a marking instruction is generated. According to the marking instruction, bad product marking is performed on the corresponding position of the pole piece by a marking device.

14. A method of detecting defects in an electrode sheet, wherein, It includes: Obtaining the B-face appearance, B-face size, pole piece appearance, and pole piece size of the post-cutting pole piece; Obtaining the A-face appearance and A-face size of the first side pole piece and the A-face appearance and A-face size of the second side pole piece, wherein the first side pole piece is one side pole piece after the post-cutting pole piece is cut, and the second side pole piece is the other side pole piece after the pole piece is cut; Detecting the pole piece for the wrinkle abnormality according to the detection information, wherein the detection information includes the B-face appearance, B-face size, pole piece appearance, pole piece size, A-face appearance, and A-face size of the first side pole piece, and the A-face appearance and A-face size of the second side pole piece, and the detecting the pole piece for the wrinkle abnormality according to the detection information includes: detecting the pole piece for the appearance shadow according to the detection information to obtain an appearance shadow detection result, and / or detecting the pole piece for the size mutation according to the detection information to obtain a size mutation detection result.

15. The pole piece defect detection method of claim 14, wherein, The detecting the pole piece for the appearance shadow according to the detection information to obtain an appearance shadow detection result includes: Obtaining the film area and the shadow area of the pole piece according to the detection information, and calculating the gray value difference between the shadow area and the film area; When the gray value difference is greater than a preset gray value difference, obtaining the area length and the area length of the shadow area; When the area length meets a preset area length and the area length is greater than a preset length, determining that the shadow area is a suspected wrinkle area.

16. The pole piece defect detection method of claim 14, wherein, The detecting the pole piece for the size mutation according to the detection information to obtain a size mutation detection result includes: Calculating the pole width difference and the film width difference between adjacent target areas according to the detection information, wherein the target area is the area between adjacent pole tabs; When the pole width difference is in a preset first difference interval and the film width difference is in a preset second difference interval, determining that the middle area between the adjacent target areas is a suspected wrinkle area.

17. The pole piece defect detection method of any one of claims 14 to 16, wherein, The method further comprises the following steps after the abnormal detection of the punching of the pole piece according to the detection information: obtaining the setting position of the detection unit detecting the punching defect and the setting position of the detection unit not detecting the punching defect; locating the punching defect according to the setting position of the detection unit detecting the punching defect and the setting position of the detection unit not detecting the punching defect.

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