Die-cutting method and die-cutting machine

Abstract

A die-cutting machine (10), comprising an unwinding mechanism (11), a cutting mechanism (12), a visual detection system (13) and a winding mechanism (14), which are sequentially arranged in a conveying direction of an electrode sheet, wherein the visual detection system is used for collecting an image of the current electrode sheet that has been cut, and the cutting mechanism is used for cutting the next electrode sheet in a first marking mode when a detection result of the current electrode sheet indicates that the current electrode sheet has a defect, the detection result of the current electrode sheet is determined on the basis of the image of the current electrode sheet, a cutting position corresponding to the next electrode sheet is used as an end position of the current battery electrode sheet section and a starting position of the next battery electrode sheet section, and the length between the starting position of the next battery electrode sheet section and a starting position of the current battery electrode sheet section is less than the length of one battery electrode sheet section. Further provided is a die-cutting method. The die-cutting machine shortens the length of an electrode sheet that does not meet standards, reduces the possibility of electrode sheet waste, and achieves the aim of saving on electrode sheets, thereby reducing the manufacturing cost of batteries, and improving the productivity of the device.

Description

Die-cutting method and die-cutting machine

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application with application number 202410179510.3, application date February 18, 2024, and invention name “Die-cutting method and die-cutting machine”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to, but is not limited to, the field of battery production technology, and in particular to a die-cutting method and a die-cutting machine. Background Art

[0004] In the related art, during the battery production process, a visual acquisition system is usually used to detect defects in the cut pole pieces (for example, metal leakage, cracking, etc.). Once a defect is detected, the pole piece with a length of one pole segment needs to be scrapped, resulting in a lot of material waste, increased battery manufacturing costs, and reduced equipment productivity.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a die-cutting method and a die-cutting machine.

[0007] The technical solution of the embodiment of the present disclosure is implemented as follows:

[0008] The present disclosure provides a die-cutting machine, comprising an unwinding mechanism, a cutting mechanism, a visual inspection system, and a rewinding mechanism, which are sequentially arranged along the conveying direction of the electrode sheet.

[0009] The unwinding mechanism is used to release the pole piece;

[0010] The cutting mechanism is used to cut the current electrode sheet released by the unwinding mechanism to form electrode ears;

[0011] The visual inspection system is used to collect images of the current electrode after cutting;

[0012] The cutting mechanism is further configured to cut a next electrode piece in a first marking manner if a detection result of the current electrode piece indicates that the current electrode piece has a defect, the detection result of the current electrode piece being determined based on an image of the current electrode piece, a cutting position corresponding to the next electrode piece serving as an end position of the current battery electrode segment and a starting position of a next battery electrode segment, and a length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment being less than a length of one battery electrode segment;

[0013] The winding mechanism is used to wind up the current pole piece.

[0014] In an embodiment of the present disclosure, the die-cutting machine includes an unwinding mechanism, a cutting mechanism, a visual inspection system and a winding mechanism arranged in sequence along the conveying direction of the electrode sheet, the unwinding mechanism is used to release the electrode sheet; the cutting mechanism is used to cut the current electrode sheet released by the unwinding mechanism to form an electrode ear; the visual inspection system is used to collect an image of the current electrode sheet after cutting; the cutting mechanism is also used to cut the next electrode sheet in a first marking manner when the inspection result of the current electrode sheet indicates that the current electrode sheet has a defect, the inspection result of the current electrode sheet is determined based on the image of the current electrode sheet, and the cutting position corresponding to the next electrode sheet serves as the end position of the current battery electrode segment and the starting position of the next battery electrode segment, and the length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment is less than the length of one battery electrode segment; the winding mechanism is used to wind up the current electrode sheet. In this way, firstly, by automatically detecting defects in the electrode, the cost of detection is reduced, and the detection efficiency and degree of automation are improved compared with manual detection; secondly, when the visual inspection system detects that there are defects in the electrode, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous reset and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous reset and re-cutting), the length of unqualified electrode is shortened, thereby reducing the possibility of electrode waste, achieving the purpose of saving electrode, and thus reducing the manufacturing cost of the battery and improving the productivity of the equipment; on the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment; finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

[0015] In some embodiments, the cutting mechanism is also used to cut the next pole piece in the first marking manner based on the received reset and re-cut signal when the detection result of the current pole piece indicates that the current pole piece has a defect; wherein the reset and re-cut signal is generated based on the defect of the current pole piece.

[0016] In the disclosed embodiment, on the one hand, a reset and re-switching signal is generated according to the defect of the pole piece, thereby realizing the reset and re-switching of the set defect, and improving the accuracy, timeliness and pertinence of the reset and re-switching signal; on the other hand, the end of the pole segment is marked in time according to the reset and re-switching signal, thereby improving the accuracy of the marking.

[0017] In some embodiments, the cutting mechanism includes a first cutting device and a second cutting device, the first cutting device being used to cut the first edge of the current pole piece to form a pole ear, and cutting the first edge of the next pole piece in the first marking manner when the distance between the defect of the current pole piece and the first edge of the current pole piece meets the distance condition; the second cutting device being used to cut the second edge of the current pole piece to form a pole ear, and cutting the second edge of the next pole piece in the first marking manner when the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, and the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

[0018] In the embodiment disclosed herein, on the one hand, two independent cutting mechanisms are used to cut different edges of the pole piece respectively, thereby reducing interference between each other; on the other hand, the corresponding cutting mechanism is selected according to the distance between the defect position and the edge of the pole piece to perform the end cutting of the pole piece segment, thereby improving the accuracy and specificity of the cutting, shortening the length of the unqualified pole piece on the corresponding side, thereby reducing the possibility of pole piece waste while also improving production efficiency.

[0019] In some embodiments, the die-cutting machine further includes a slitting mechanism and a marking mechanism, wherein the slitting mechanism is located between the cutting mechanism and the marking mechanism, and is used to slit the current pole piece into a first part and a second part along the length direction of the pole piece; the marking mechanism is located between the visual inspection system and the winding mechanism, and is used to mark the current pole piece in a second marking manner when the inspection result of the current pole piece indicates that the current pole piece has a defect, and the second marking manner indicates that the battery pole segment in which the current pole piece is located is a defective battery pole segment.

[0020] In the embodiment of the present disclosure, on the one hand, by integrating a slitting mechanism in the die-cutting machine to slit the pole pieces after cutting the pole ears, the manufacturing efficiency of the pole pieces is improved, thereby improving the production efficiency of the equipment; on the other hand, the defective pole pieces are marked as unqualified in a timely manner through the marking mechanism, so as to facilitate the subsequent accurate removal of unqualified pole pieces.

[0021] In some embodiments, the slitting mechanism includes a slitting frame and a cutter located on the slitting frame; the cutter on the slitting frame is used to cut the current pole piece into a first part and a second part along the length direction of the pole piece.

[0022] In the embodiment of the present disclosure, the battery strip is cut by a cutter on a cutting machine frame, thereby improving the accuracy of cutting.

[0023] In some embodiments, the die-cutting machine further includes an encoding device; the encoding device is used to send at least one output signal to a preset control device, so that the control device controls the marking mechanism to mark the current pole piece in the second marking method based on the at least one output signal.

[0024] In the embodiment of the present disclosure, the position of the pole piece is located by the signal output by the encoding device, which improves the positioning accuracy, thereby improving the accuracy of marking defective pole pieces, thereby reducing the possibility of pole piece waste and battery production costs.

[0025] In some embodiments, the marking mechanism includes a first marking mechanism and a second marking mechanism, and the winding mechanism includes a first winding mechanism and a second winding mechanism, wherein: the first marking mechanism is used to mark the first part of the current pole piece in the second marking method when the defect of the current pole piece is located in the first part of the current pole piece; the first winding mechanism is used to wind up the first part of the current pole piece; the second marking mechanism is used to mark the second part of the current pole piece in the second marking method when the defect of the current pole piece is located in the second part of the current pole piece; the second winding mechanism is used to wind up the second part of the current pole piece.

[0026] In the disclosed embodiment, on the one hand, the corresponding marking mechanism is selected according to the location of the defect to mark the unqualified pole piece, thereby improving the accuracy and pertinence of the marking, so as to facilitate the subsequent accurate removal of unqualified pole pieces; on the other hand, different parts of the pole piece are wound up in time by different winding mechanisms, thereby improving the accuracy of the die-cutting machine operation, and being able to meet the production needs of high timeliness and high efficiency.

[0027] In some embodiments, the visual inspection system includes a first image acquisition device, a second image acquisition device, a third image acquisition device, and a fourth image acquisition device arranged in sequence along the conveying direction of the electrode piece. The visual inspection system also includes a fifth image acquisition device and a sixth image acquisition device. The first image acquisition device, the second image acquisition device, the third image acquisition device, and the fourth image acquisition device are all located between the cutting mechanism and the slitting mechanism, and are used to acquire an image of the current electrode piece after cutting; the fifth image acquisition device is located between the slitting mechanism and the first marking mechanism, and is used to acquire an image of the first part of the current electrode piece after slitting; the sixth image acquisition device is located between the slitting mechanism and the second marking mechanism, and is used to acquire an image of the second part of the current electrode piece after slitting.

[0028] In the embodiments of the present disclosure, on the one hand, multiple defect detections are performed on the same side and / or different sides of the pole piece through images captured by different visual inspection systems, thereby improving the comprehensiveness and accuracy of defect detection; on the other hand, the inspection results of the pole piece are determined based on the images captured by each visual inspection system, thereby improving the accuracy of the inspection results.

[0029] In some embodiments, the die-cutting machine further includes at least one of the following: a dust removal mechanism, a deviation correction mechanism, and a tension adjustment mechanism. The dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the current electrode after cutting is completed; the deviation correction mechanism is located between the unwinding mechanism and the cutting mechanism, and / or between the cutting mechanism and the slitting mechanism, and is used to correct the deviation of the current electrode; the tension adjustment mechanism is located between the dust removal mechanism and the winding mechanism, and is used to adjust the winding tension of the winding mechanism.

[0030] In the embodiment of the present disclosure, by integrating a mechanism with multiple functions in the die-cutting equipment, the functions of the die-cutting machine are enriched, and the die-cutting quality is improved while the die-cutting efficiency is improved, thereby improving the versatility and adaptability of the die-cutting machine.

[0031] In some embodiments, the dust removal mechanism includes a first dust removal mechanism and a second dust removal mechanism; the first dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the first surface of the current pole piece after cutting is completed; the second dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the second surface of the current pole piece after cutting is completed.

[0032] In the embodiment of the present disclosure, the first dust removal mechanism and the second dust removal mechanism are used to remove dust from different surfaces of the battery material strip respectively, thereby improving the accuracy and comprehensiveness of dust removal, thereby reducing the possibility of poor battery performance caused by dust contamination on the material strip.

[0033] In some embodiments, the correction mechanism includes a first correction mechanism and a second correction mechanism; the first correction mechanism is located between the unwinding mechanism and the cutting mechanism, and is used to correct the current pole piece that has not been cut; the second correction mechanism is located between the cutting mechanism and the slitting mechanism, and is used to correct the current pole piece that has not been cut.

[0034] In the embodiment of the present disclosure, by timely correcting the uncut material strips and unslit material strips, the possibility of uneven cutting and high scrap rate due to material strip deviation is reduced.

[0035] The present disclosure provides a die-cutting method, which includes:

[0036] Controlling the visual inspection system of the die-cutting machine to collect an image of the current electrode; wherein the die-cutting machine includes an unwinding mechanism, a cutting mechanism, the visual inspection system, and a rewinding mechanism sequentially arranged along the conveying direction of the electrode;

[0037] Determining a detection result of the current pole piece based on the image of the current pole piece;

[0038] When the inspection result of the current electrode sheet indicates that the current electrode sheet has a defect, the cutting mechanism is controlled to cut the next electrode sheet in a first marking manner; wherein the cutting position corresponding to the next electrode sheet serves as the end position of the current battery electrode segment and the starting position of the next battery electrode segment, and the length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment is less than the length of one battery electrode segment.

[0039] In the disclosed embodiment, firstly, by automatically detecting defects on the electrode sheet, the detection cost is reduced, and the detection efficiency and degree of automation are improved compared with manual detection; secondly, when the visual detection system detects that there is a defect in the electrode sheet, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous reset and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous reset and re-cutting), the length of unqualified electrode sheets is shortened, thereby reducing the possibility of electrode sheet waste, achieving the purpose of saving electrode sheets, and further reducing the manufacturing cost of the battery and improving the productivity of the equipment; on the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment; finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

[0040] In some embodiments, the visual inspection system includes multiple image acquisition devices, and the image of the current pole piece includes the image of the current pole piece acquired by each of the image acquisition devices; determining the inspection result of the current pole piece based on the image of the current pole piece includes: determining the inspection result of the current pole piece based on the image of the current pole piece acquired by each of the image acquisition devices.

[0041] In the disclosed embodiment, the detection result of the pole piece is determined based on multiple images collected by the visual inspection system, thereby improving the accuracy of the detection result.

[0042] In some embodiments, controlling the cutting mechanism to cut the next pole piece in a first marking manner includes: generating a reset re-cutting signal based on the defect of the current pole piece; sending the reset re-cutting signal to the cutting mechanism so that the cutting mechanism cuts the next pole piece in the first marking manner based on the reset re-cutting signal.

[0043] In the disclosed embodiment, on the one hand, a reset and re-cut signal is generated according to the defect of the pole piece, thereby realizing the reset and re-cutting of the set defect, and improving the accuracy, timeliness and pertinence of the reset and re-cut signal; on the other hand, the cutting mechanism marks the end of the pole segment in time according to the reset and re-cut signal, thereby improving the accuracy of the marking.

[0044] In some embodiments, generating a reset and re-switching signal based on the defect of the current pole piece includes: using a preset correspondence relationship to determine a target processing method corresponding to the defect of the current pole piece; wherein the correspondence relationship characterizes the relationship between at least one defect and at least one processing method, and the at least one processing method includes at least one of the following: alarm processing, shutdown processing, marking processing, and re-switching processing; when the target processing method includes re-switching processing, generating the reset and re-switching signal.

[0045] In the embodiment of the present disclosure, on the one hand, the target processing method corresponding to the defect is determined based on the corresponding relationship, thereby improving the accuracy and flexibility of the target processing method; on the other hand, a reset re-cutting signal is generated only when the pole piece needs to be re-cut, thereby improving the targeted re-cutting processing of the pole piece.

[0046] In some embodiments, the die-cutting method includes: displaying a configuration interface, the configuration interface including a configuration area, the configuration area being used to configure the relationship between at least one defect and at least one processing method; and determining the corresponding relationship in response to a configuration operation performed in the configuration area.

[0047] In the embodiment of the present disclosure, the corresponding relationship is configured through a visual interface, which simplifies the operation steps and improves the accuracy of the corresponding relationship.

[0048] In some embodiments, the sending of the reset re-cutting signal to the cutting mechanism so that the cutting mechanism cuts the next pole piece in the first marking manner based on the reset re-cutting signal includes at least one of the following: when the distance between the defect of the current pole piece and the first edge of the current pole piece meets the distance condition, the reset re-cutting signal is sent to the first cutting device in the cutting mechanism so that the first cutting device cuts the first edge of the next pole piece in the first marking manner based on the reset re-cutting signal; when the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, the reset re-cutting signal is sent to the second cutting device in the cutting mechanism so that the second cutting device cuts the second edge of the next pole piece in the first marking manner based on the reset re-cutting signal; wherein, the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

[0049] In the embodiment disclosed herein, first, two independent cutting mechanisms are used to cut different edges of the pole piece respectively, thereby reducing interference between each other; second, the corresponding cutting mechanism is selected according to the distance between the defect position and the edge of the pole piece to perform the end cutting of the pole piece, thereby improving the accuracy and specificity of the cutting, shortening the length of the unqualified pole piece on the corresponding side, thereby reducing the possibility of pole piece waste while also improving production efficiency; finally, the end of the pole piece is marked in time according to the reset re-cutting signal, thereby improving the accuracy of the marking.

[0050] In some embodiments, the die-cutting method further includes: based on the defects of the current pole piece, controlling the marking mechanism to mark the current pole piece in a second marking method; wherein, the marking mechanism is located between the visual inspection system and the winding mechanism, and the second marking method characterizes that the battery pole segment in which the current pole piece is located is a defective battery pole segment.

[0051] In the embodiment of the present disclosure, defective pole pieces are promptly marked as unqualified by a marking mechanism, so that unqualified pole pieces can be accurately removed subsequently.

[0052] In some embodiments, based on the defect of the current pole piece, the marking mechanism is controlled to mark the current pole piece in a second marking manner, including: using a preset correspondence relationship to determine the target processing method corresponding to the defect of the current pole piece; wherein the correspondence relationship characterizes the relationship between at least one defect and at least one processing method, and the at least one processing method includes at least one of the following: alarm processing, shutdown processing, marking processing, and re-cutting processing; when the target processing method includes marking processing, the marking mechanism is controlled to mark the current pole piece in the second marking method.

[0053] In the embodiment of the present disclosure, on the one hand, the target processing method corresponding to the defect is determined according to the corresponding relationship, thereby improving the accuracy and flexibility of the target processing method; on the other hand, the electrode is marked only when it needs to be marked, thereby improving the targetedness of the electrode marking treatment.

[0054] In some embodiments, controlling the marking mechanism to mark the current electrode sheet in the second marking manner includes at least one of the following: when the defect of the current electrode sheet is located in the first part of the current electrode sheet, controlling the first marking mechanism in the marking mechanism to mark the first part of the current electrode sheet in the second marking manner; when the defect of the current electrode sheet is located in the second part of the current electrode sheet, controlling the second marking mechanism in the marking mechanism to mark the second part of the current electrode sheet in the second marking manner; wherein the first part of the current electrode sheet and the second part of the current electrode sheet are obtained by cutting the current electrode sheet by the slitting mechanism of the die-cutting machine along the length direction of the electrode sheet, and the slitting mechanism is located between the cutting mechanism and the marking mechanism.

[0055] In the embodiment of the present disclosure, on the one hand, by integrating a slitting mechanism in the die-cutting machine to slit the pole pieces after cutting the pole ears, the manufacturing efficiency of the pole pieces is improved, thereby improving the production efficiency of the equipment; on the other hand, the corresponding marking mechanism is selected according to the location of the defect to mark the unqualified pole pieces, thereby improving the accuracy and specificity of the marking, so as to facilitate the subsequent accurate removal of unqualified pole pieces.

[0056] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and, together with the specification, are used to explain the technical solutions of the present disclosure.

[0058] FIG1 is a schematic diagram of the structure of a die-cutting machine provided in an embodiment of the present disclosure;

[0059] FIG2 is a schematic diagram of a cutting mechanism for marking a pole piece according to an embodiment of the present disclosure;

[0060] FIG3 is a schematic diagram of the structure of a visual inspection system provided by an embodiment of the present disclosure;

[0061] FIG4 is a schematic diagram of a defective electrode marking provided by an embodiment of the present disclosure;

[0062] FIG5 is a second schematic diagram of the structure of a die-cutting machine provided in an embodiment of the present disclosure;

[0063] FIG6 is a third schematic diagram of the structure of a die-cutting machine provided in an embodiment of the present disclosure;

[0064] FIG7 is a schematic diagram of an implementation flow of a die-cutting method provided in an embodiment of the present disclosure;

[0065] FIG8 is a first schematic diagram of a configuration interface provided by an embodiment of the present disclosure;

[0066] FIG9 is a second schematic diagram of a configuration interface provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting the present disclosure. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0068] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0069] In the following description, the terms "first\second\third" are used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first\second\third" can be interchanged with the specific order or sequence where permitted, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art of the present disclosure. The terms used herein are only for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure.

[0071] In related technologies, new energy batteries are increasingly being used in daily life and industry. New energy batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As the application areas of power batteries continue to expand, their market demand is also growing. Batteries can be single cells. A single cell is a basic unit that can convert chemical energy into electrical energy and can be used to make battery modules or battery packs to power electrical devices. A single cell can be a secondary battery, which refers to a cell that can be recharged to activate the active material after discharge and continue to be used. Cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, and others. A battery can also be a single physical module comprising one or more cells to provide higher voltage and capacity. When there are multiple cells, they are connected in series, parallel, or in parallel via a busbar. The electrode plate is the main component of a single battery and directly determines the electrochemical performance and safety of the battery.

[0072] The pole piece is a key component of a single battery cell, directly determining its electrochemical performance and safety. It consists of a metal current collector and a coating uniformly applied to the metal current collector. During the manufacturing process, pole pieces are delivered in rolls for coating, rolling, and slitting.

[0073] The production equipment of the battery cell pre-process (for example, die-cutting machines) usually uses a visual acquisition system to detect defects in the cut pole pieces (for example, metal leakage, cracking, etc.). Once a defect is detected in the pole piece, the cutting mechanism will still die-cut the entire pole piece, and the marking mechanism behind the cutting mechanism will mark the unqualified pole piece. The pole piece of the same length will need to be scrapped later, resulting in a lot of material waste, increased battery manufacturing costs, and reduced equipment productivity.

[0074] The disclosed embodiment provides a die-cutting machine. First, by automatically detecting defects in the electrode sheet, the detection cost is reduced, and the detection efficiency and automation level are improved compared with manual detection. Second, when the visual detection system detects that there is a defect in the electrode sheet, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous resetting and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous resetting and re-cutting), the length of unqualified electrode sheets is shortened, thereby reducing the possibility of electrode sheet waste, achieving the purpose of saving electrode sheets, and further reducing the manufacturing cost of the battery and improving the productivity of the equipment. On the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment. Finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

[0075] The method provided by the embodiments of the present disclosure can be performed by a die-cutting machine, a control device, etc. The die-cutting machine can be a die-cutting device of any suitable type and in any suitable scenario. In some embodiments, the die-cutting machine can include the control device. The control device can include, but is not limited to, at least one of a programmable logic controller (PLC), a host computer, a middle computer, a single-chip microcomputer, etc. During implementation, the control device can also include a processor and a memory storing processor-executable instructions. When the instructions are executed by the processor, the method provided by the embodiments of the present disclosure is implemented.

[0076] Below, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure.

[0077] FIG1 is a schematic diagram of the structure of a die-cutting machine provided in an embodiment of the present disclosure. As shown in FIG1 , the die-cutting machine 10 includes an unwinding mechanism 11, a cutting mechanism 12, a visual inspection system 13, and a rewinding mechanism 14, which are sequentially arranged along the conveying direction of the electrode sheet.

[0078] The unwinding mechanism 11 is used to release the electrode;

[0079] The cutting mechanism 12 is used to cut the current electrode sheet released by the unwinding mechanism to form electrode ears;

[0080] The visual inspection system 13 is used to collect images of the current electrode after cutting;

[0081] The cutting mechanism 12 is further configured to cut a next electrode piece in a first marking manner when the inspection result of the current electrode piece indicates that the current electrode piece has a defect, the inspection result of the current electrode piece being determined based on the image of the current electrode piece, the cutting position corresponding to the next electrode piece serving as the end position of the current battery electrode segment and the starting position of the next battery electrode segment, and the length between the next electrode piece and the starting position of the current battery electrode segment being less than the length of one battery electrode segment;

[0082] The winding mechanism 14 is used to wind up the current pole piece.

[0083] Here, the unwinding mechanism 11 can be any suitable mechanism that can realize the unwinding function. In some embodiments, the unwinding mechanism 11 can include an unwinding shaft, on which the pole piece is wound. During implementation, the unwinding shaft releases the pole piece when it rotates around its central axis. In some embodiments, the unwinding mechanism 11 can also include a spare unwinding shaft, a roll-changing device, etc. Among them, the spare unwinding shaft is used to release the spare pole piece, and the roll-changing device is used to automatically switch the unwinding shaft to the spare unwinding shaft, that is, to pull the tail of the pole piece on the unwinding shaft to move to the head of the spare unwinding shaft for engagement. In this way, automatic roll changing is achieved through the roll-changing device, which improves the roll changing efficiency and thus improves the working efficiency of the die-cutting machine.

[0084] The winding mechanism 14 can be any suitable mechanism that can realize the winding function. The number of the winding mechanisms 14 can be at least one. In some embodiments, the number of the winding mechanisms 14 matches the number of electrode slitting, and each winding mechanism 14 is used to wind up the corresponding electrode. In some embodiments, the winding mechanism 14 may include a winding shaft, which winds up the electrode when rotating around its central axis. In some embodiments, the winding mechanism 14 also includes a spare winding roller and a splicing device, and the splicing device is used to cut off the unwound electrode and wind it onto the spare winding roller after the winding roller is wound. In this way, automatic winding and splicing of materials is achieved through the splicing device, which improves the winding efficiency and thus improves the working efficiency of the die-cutting machine.

[0085] The visual inspection system 13 can be any suitable system capable of image acquisition. The visual inspection system 13 includes at least one image acquisition device, which may include, but is not limited to, a camera. In some embodiments, the visual inspection system 13 acquires images based on acquisition instructions sent by a control device. This reduces acquisition times and hardware consumption compared to real-time acquisition. In implementation, the control device can be located within the die-cutting machine or independently thereof.

[0086] The detection results of the current pole piece may include but are not limited to the first detection result, the second detection result, etc., wherein the first detection result indicates that the current pole piece has defects, and the second detection result indicates that the current pole piece does not have defects. The defects of the pole piece may be defects of the pole piece itself, such as: metal leakage in the membrane area, dark spots, dark marks, cracks, etc., or defects not of the pole piece itself, such as: tab excess material / breakage / folding, straight edge excess material / breakage, splicing, etc. In some embodiments, the collected image is compared with the corresponding standard image to obtain the detection result of the current pole piece. In some embodiments, the image of the current pole piece can be identified by any suitable neural network, model, etc. to obtain the detection result of the current pole piece. wherein the neural network / model can be obtained by training using a training sample set. The training sample set may include sample images with different defects, sample images without defects, etc.

[0087] The cutting mechanism 12 can be any suitable mechanism that can realize the cutting function. In some embodiments, the cutting mechanism 12 may include at least one cutting device, and different cutting devices are used to cut different areas of the pole piece. The cutting device may include but is not limited to a cutter, a cutting head, etc. For example, the cutting mechanism includes two cutting devices, and the two cutting devices are respectively used to cut the blank areas at the two edges of the pole piece to form the pole lugs. For another example, the cutting device includes three cutting devices, wherein two cutting devices are respectively used to cut the blank areas at the two edges of the pole piece to form the pole lugs, and another cutting device is used to cut the blank area in the middle of the pole piece to form the pole lugs.

[0088] The cutting position corresponding to the next pole piece refers to the position where the next pole piece is cut in the first marking manner. The first marking manner can be any suitable marking manner. For example, a pattern, a cutting distance, a cutting method, etc. For example, continuously cutting three pole ears with non-equal spacing. For another example, only cutting a part of the pole ear. In some embodiments, the starting mark and the ending mark of the pole segment can also be cut by the first marking method. During implementation, if the pole segment does not have defects, the starting mark and the ending mark are cut respectively in the first marking method according to the length of a normal pole segment; if the pole segment has defects, the ending mark is cut in advance in the first marking method so that the length between the starting mark and the ending mark of the pole segment is less than the length of a normal pole segment, thereby achieving the purpose of reducing the waste of pole pieces.

[0089] FIG2 is a schematic diagram of a cutting mechanism for marking a pole piece according to an embodiment of the present disclosure, as shown in FIG2 , wherein:

[0090] When the electrode piece is transferred to the cutting mechanism, the electrode piece is normally cut by the cutting mechanism to form a first electrode tab 21;

[0091] When the cut electrode piece is transmitted to the visual inspection system, if the inspection result of the electrode piece indicates that there is a defect 22 in the electrode piece, the cutting mechanism is used to cut the next electrode piece in a first marking manner to form a second electrode ear 23. The second electrode ear 23 is a part of the first electrode ear 21, and the cutting position of the second electrode ear 23 serves as the cutting position corresponding to the next electrode piece.

[0092] In some embodiments, the cutting mechanism 12 is also used to cut the next pole piece in the first marking manner based on the received reset and re-cut signal when the detection result of the current pole piece indicates that the current pole piece has a defect; wherein the reset and re-cut signal is generated based on the defect of the current pole piece.

[0093] Here, the handling methods corresponding to different defects can be the same or different. During implementation, the handling method corresponding to the defect may include at least one handling method. The handling methods may include but are not limited to alarm handling, shutdown handling, marking handling, re-cutting handling, etc. Alarm handling refers to reminding staff to handle the problem in a timely manner through pop-up windows, prompts, etc. Shutdown handling refers to shutting down the die-cutting machine. Marking handling refers to marking the electrode. Re-cutting handling refers to marking the end mark of the electrode segment in advance.

[0094] In some embodiments, a correspondence between defects and treatment methods can be pre-established, and then the corresponding target treatment method can be obtained based on the correspondence. During implementation, those skilled in the art can independently set the correspondence according to actual needs, and the embodiments of this disclosure are not limited thereto.

[0095] The reset and re-cut signal can be any suitable signal. The reset and re-cut signal is used to promptly mark the end of cutting the pole segment. In some embodiments, when the control device determines that the treatment method corresponding to the defect of the current pole segment includes the re-cutting treatment, the reset and re-cut signal is automatically generated and sent to the cutting mechanism, so that the cutting mechanism promptly cuts the next pole segment in the first marking method.

[0096] In the disclosed embodiment, on the one hand, a reset and re-switching signal is generated according to the defect of the pole piece, thereby realizing the reset and re-switching of the set defect, and improving the accuracy, timeliness and pertinence of the reset and re-switching signal; on the other hand, the end of the pole segment is marked in time according to the reset and re-switching signal, thereby improving the accuracy of the marking.

[0097] In some embodiments, the cutting mechanism 12 includes a first cutting device and a second cutting device, the first cutting device being used to cut the first edge of the current pole piece to form a pole ear, and cutting the first edge of the next pole piece in the first marking manner when the distance between the defect of the current pole piece and the first edge of the current pole piece meets the distance condition; the second cutting device being used to cut the second edge of the current pole piece to form a pole ear, and cutting the second edge of the next pole piece in the first marking manner when the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, and the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

[0098] Here, the distance condition may be any suitable condition, for example, less than a distance threshold. The distance threshold may be any suitable value, for example, half the width of the pole piece.

[0099] In some embodiments, since the defect may be irregular, the first distance between the minimum circumscribed rectangle of the defect and the edge of the pole piece (including the first edge and the second edge) can be used as the distance between the defect and the edge of the pole piece. The first distance may refer to the distance between the edge of the pole piece and the set side (parallel to the edge) of the minimum circumscribed rectangle. The set side may include but is not limited to the upper side, the lower side, the middle side (i.e., the side corresponding to the midpoint between the upper side and the lower side), etc. For example, if the distance between the first edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than the distance threshold, and the distance between the second edge of the pole piece and the lower side of the minimum circumscribed rectangle is greater than the distance threshold, the first edge of the next pole piece is cut in the first marking manner. For another example, if the distance between the second edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than the distance threshold, and the distance between the first edge of the pole piece and the lower side of the minimum circumscribed rectangle is greater than the distance threshold, the second edge of the next pole piece is cut in the first marking manner. For example, if the distance between the first edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than a distance threshold, and the distance between the second edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than a distance threshold, the first edge of the next pole piece and the second edge of the next pole piece are cut in a first marking manner.

[0100] In the embodiment disclosed herein, on the one hand, two independent cutting mechanisms are used to cut different edges of the pole piece respectively, thereby reducing interference between each other; on the other hand, the corresponding cutting mechanism is selected according to the distance between the defect position and the edge of the pole piece to perform the end cutting of the pole piece segment, thereby improving the accuracy and specificity of the cutting, shortening the length of the unqualified pole piece on the corresponding side, thereby reducing the possibility of pole piece waste while also improving production efficiency.

[0101] In some embodiments, the die-cutting machine further includes a slitting mechanism and a marking mechanism, wherein the slitting mechanism is located between the cutting mechanism and the marking mechanism, and is used to slit the current pole piece into a first part and a second part along the length direction of the pole piece; the marking mechanism is located between the visual inspection system and the winding mechanism, and is used to mark the current pole piece in a second marking manner when the inspection result of the current pole piece indicates that the current pole piece has a defect, and the second marking manner indicates that the battery pole segment in which the current pole piece is located is a defective battery pole segment.

[0102] Here, the slitting mechanism can be any suitable mechanism that can realize the slitting function. The number of the slitting mechanisms can be at least one. In some embodiments, the number of slitting mechanisms matches the number of electrode conveyor lines, and each slitting mechanism is used to slit the electrode on the corresponding electrode conveyor line. In some embodiments, the slitting mechanism may include but is not limited to a slitting rack, and at least one cutter located on the slitting rack, the cutters are arranged at intervals along the length direction of the electrode, and the electrode can be cut into at least two parts. In this way, the battery material strip is cut by the cutter on the slitting rack, which improves the accuracy of slitting.

[0103] The marking mechanism can be any suitable mechanism capable of marking a pole piece, such as a laser marker, color marker, or pattern marker. This marking mechanism is used to mark the battery pole segment in which the pole piece is located as unqualified if the inspection results of the current pole piece indicate a defect. There can be at least one marking mechanism. In some embodiments, the current pole piece is marked by the marking mechanism when it is transferred within the marking range of the marking mechanism.

[0104] In some embodiments, the die-cutting machine further includes an encoding device; the encoding device is configured to send at least one output signal to a preset control device, so that the control device controls the marking mechanism to mark the current electrode based on the at least one output signal.

[0105] Here, the encoding device can be any suitable device that can realize this function. For example, an encoder. The output signal can be a pulse signal, a square wave signal, etc. During implementation, the control device can calculate the position information of the current pole piece based on the output signal sent by the encoding device, and if the current pole piece is transmitted to the marking range of the marking mechanism, the marking mechanism is controlled to mark the current pole piece. For example, if the current pole piece is 3 meters away from the marking mechanism, the encoding device outputs 1000 pulse signals, and the pole piece tape length is 0.5 meters, then when the encoding device outputs 6000 (1000*3 / 0.5) pulse signals, it indicates that the current pole piece has been transmitted to the marking mechanism. At this time, the marking mechanism is controlled to mark the current pole piece. In this way, the position of the pole piece is located by the signal output by the encoding device, which improves the positioning accuracy, thereby improving the accuracy of marking defective pole pieces, thereby reducing the possibility of pole piece waste and battery production costs.

[0106] In the embodiment of the present disclosure, on the one hand, by integrating a slitting mechanism in the die-cutting machine to slit the pole pieces after cutting the pole ears, the manufacturing efficiency of the pole pieces is improved, thereby improving the production efficiency of the equipment; on the other hand, the defective pole pieces are marked as unqualified in a timely manner through the marking mechanism, so as to facilitate the subsequent accurate removal of unqualified pole pieces.

[0107] In some embodiments, the visual inspection system 13 includes a first image acquisition device, a second image acquisition device, a third image acquisition device and a fourth image acquisition device arranged in sequence along the conveying direction of the electrode piece, and the visual inspection system also includes a fifth image acquisition device and a sixth image acquisition device, wherein: the first image acquisition device, the second image acquisition device, the third image acquisition device and the fourth image acquisition device are all located between the cutting mechanism and the slitting mechanism, and are used to acquire the image of the current electrode piece after cutting; the fifth image acquisition device is located between the slitting mechanism and the first marking mechanism, and is used to acquire the image of the first part of the current electrode piece after slitting; the sixth image acquisition device is located between the slitting mechanism and the second marking mechanism, and is used to acquire the image of the second part of the current electrode piece after slitting.

[0108] Here, the images captured by each image acquisition device in the visual inspection system can be used for different types of defect detection, and / or for detecting defects on different surfaces of the electrode. For example, the image captured by the first image acquisition device is used to detect whether there is metal leakage on the back of the electrode; the image captured by the second image acquisition device is used to detect whether there are defects in the coating area on the back of the electrode; the image captured by the third image acquisition device is used to detect whether there are defects in the coating area on the front of the electrode; the image captured by the fourth image acquisition device is used to detect whether there are defects in the formed electrode tab; the image captured by the fifth image acquisition device is used to detect whether there are defects on the front of the first part of the electrode; and the image captured by the sixth image acquisition device is used to detect whether there are defects on the front of the second part of the electrode.

[0109] FIG3 is a schematic diagram of the composition structure of a visual inspection system provided by an embodiment of the present disclosure. As shown in FIG3 , the visual inspection system includes four cameras sequentially deployed along the conveying direction of the pole piece, namely: a first camera 131 (corresponding to the aforementioned first image acquisition device), a second camera 132 (corresponding to the aforementioned second image acquisition device), a third camera 133 (corresponding to the aforementioned third image acquisition device), and a fourth camera 134 (corresponding to the aforementioned fourth image acquisition device). The visual inspection system also includes a fifth camera 135 (corresponding to the aforementioned fifth image acquisition device) and a sixth camera 136 (corresponding to the aforementioned sixth image acquisition device), wherein:

[0110] The first camera 131 is used to collect an image of the back side of the cut electrode piece, and the image is used to perform metal leakage detection on the back side of the electrode piece;

[0111] The second camera 132 is used to collect the reverse image of the cut electrode piece, and the reverse image is used to perform defect detection on the reverse film area of ​​the cut electrode piece;

[0112] The third camera 133 is used to collect the front image of the cut electrode piece, and the front image is used to perform defect detection on the front film area of ​​the cut electrode piece;

[0113] The fourth camera 134 is used to capture the front image of the cut electrode piece, which is used to detect defects in the electrode tabs of the cut electrode piece;

[0114] The fifth camera 135 is used to collect a front image of the first part of the electrode piece, and the front image is used to perform defect detection on the front of the first part of the electrode piece after slitting (including the film area, the non-film area, etc.);

[0115] The sixth camera 136 is used to collect a front image of the second part of the electrode piece, and the front image is used to perform defect detection on the front surface (including the film area, non-film area, etc.) of the second part of the electrode piece after cutting.

[0116] In some embodiments, when the detection result determined by the image captured by at least one image acquisition device is the first detection result, the first detection result is used as the detection result of the current electrode; when the detection result determined by the image captured by each image acquisition device is the second detection result, the second detection result is used as the detection result of the current electrode.

[0117] In the embodiments of the present disclosure, on the one hand, multiple defect detections are performed on the same side and / or different sides of the pole piece through images captured by different visual inspection systems, thereby improving the comprehensiveness and accuracy of defect detection; on the other hand, the inspection results of the pole piece are determined based on the images captured by each visual inspection system, thereby improving the accuracy of the inspection results.

[0118] In some embodiments, the marking mechanism includes a first marking mechanism and a second marking mechanism, and the winding mechanism includes a first winding mechanism and a second winding mechanism; wherein: the first marking mechanism is used to mark the first part of the current pole piece in the second marking method when the defect of the current pole piece is located in the first part of the current pole piece; the first winding mechanism is used to wind up the first part of the current pole piece; the second marking mechanism is used to mark the second part of the current pole piece in the second marking method when the defect of the current pole piece is located in the second part of the current pole piece; the second winding mechanism is used to wind up the second part of the current pole piece.

[0119] Here, when the current pole piece is subjected to defect detection, it is possible to determine whether the current pole piece has defects, the location of the defects, etc. During implementation, the first part of the current pole piece at least includes the first edge of the current pole piece, and the second part of the current pole piece at least includes the second edge of the current pole piece. Then, if the distance between the defect and the first edge of the current pole piece meets the distance condition, it indicates that the defect is located in the first part; if the distance between the defect and the second edge of the current pole piece meets the distance condition, it indicates that the defect is located in the second part; if the distance between the defect and the first edge of the current pole piece, and the distance between the defect and the second edge of the current pole piece both meet the distance condition, it indicates that the defect is located in both the first part and the second part.

[0120] FIG4 is a schematic diagram of a defective electrode marking provided by an embodiment of the present disclosure, as shown in FIG4 , wherein:

[0121] When the electrode piece is transferred to the cutting mechanism, the electrode piece is normally cut by the cutting mechanism to form a first electrode tab 21;

[0122] When the cut electrode piece is transmitted to the visual inspection system, if the inspection result of the electrode piece indicates that there is a defect 22 in the electrode piece, the distance between the first edge 431 of the electrode piece and the lower side 441 of the minimum circumscribed rectangle of the defect 22 is less than the distance threshold, and the distance between the second edge 432 of the electrode piece and the lower side 441 of the minimum circumscribed rectangle of the defect is greater than the distance threshold, the first edge of the next electrode piece is cut in a first marking manner by using the cutting mechanism to form a second electrode tab 23, and the second electrode tab 23 is a part of the first electrode tab 21;

[0123] When the cut electrode sheet is transferred to the slitting mechanism, the slitting mechanism divides the electrode sheet into a first portion 461 and a second portion 462 along the length direction;

[0124] Since the defect 22 is located in the first portion 461 , when the first portion 461 of the pole piece is transferred to the first marking mechanism, the first marking mechanism performs a mark 47 at the defect 22 .

[0125] FIG5 is a second schematic diagram of the composition structure of a die-cutting machine provided in an embodiment of the present disclosure. As shown in FIG5 , the die-cutting machine 10 includes an unwinding mechanism 11, a cutting mechanism 12, a visual inspection system 13, and a rewinding mechanism 14, which are sequentially arranged along the conveying direction of the electrode. The die-cutting machine 10 also includes a slitting mechanism 15 located between the cutting mechanism 12 and the rewinding mechanism 14, and a marking mechanism 16 located between the visual inspection system 13 and the rewinding mechanism 14, wherein:

[0126] When the electrode piece unwound by the unwinding mechanism 11 is transferred to the cutting mechanism 12, the cutting mechanism 12 cuts the electrode piece to form an electrode ear;

[0127] When the cut electrode piece is transmitted to the visual inspection system 13, the visual inspection system 13 collects an image of the current electrode piece;

[0128] When the detection result determined based on the image indicates that a defect exists, the cutting mechanism 12 cuts the next pole piece in the first marking manner based on the received reset re-cutting signal;

[0129] When the current electrode piece is transferred to the cutting mechanism 15 , the cutting mechanism 15 cuts the current electrode piece into a first part and a second part;

[0130] The marking mechanism 16 includes a first marking mechanism 161 and a second marking mechanism 162. When a defect is located in the first part, if the first part is transferred to the first marking mechanism 161, the first marking mechanism 161 marks the first part in the second marking manner; and / or, when a defect is located in the second part, if the second part is transferred to the second marking mechanism 162, the second marking mechanism 162 marks the second part in the second marking manner.

[0131] The winding mechanism 14 includes a first winding mechanism 141 and a second winding mechanism 142. When the first part is transmitted to the first winding mechanism 141, the first winding mechanism 141 winds up the first part. When the second part is transmitted to the second winding mechanism 142, the second winding mechanism 142 winds up the second part.

[0132] In the disclosed embodiment, on the one hand, the corresponding marking mechanism is selected according to the location of the defect to mark the unqualified pole piece, thereby improving the accuracy and pertinence of the marking, so as to facilitate the subsequent accurate removal of unqualified pole pieces; on the other hand, different parts of the pole piece are wound up in time by different winding mechanisms, thereby improving the accuracy of the die-cutting machine operation, and being able to meet the production needs of high timeliness and high efficiency.

[0133] In some embodiments, the die-cutting machine also includes at least one of the following: a dust removal mechanism, a deviation correction mechanism, and a tension adjustment mechanism. The dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the current electrode after cutting is completed; the deviation correction mechanism is located between the unwinding mechanism and the cutting mechanism, and / or between the cutting mechanism and the slitting mechanism, and is used to correct the deviation of the current electrode; the tension adjustment mechanism is located between the dust removal mechanism and the winding mechanism, and is used to adjust the winding tension of the winding mechanism.

[0134] Here, the dust removal mechanism can be any suitable mechanism that can achieve the dust removal function, such as a blowing device, a brush, etc. In some embodiments, the number of the dust removal mechanism can be at least one, for example, a dust removal mechanism is respectively deployed on the A / B surface of the electrode, for example, the dust removal mechanism includes a first dust removal mechanism and a second dust removal mechanism, the first dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the first surface of the current electrode after cutting is completed, and the second dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the second surface of the current electrode strip after cutting is completed, and the first surface and the second surface are different surfaces. In this way, the first dust removal mechanism and the second dust removal mechanism are used to remove dust from different surfaces of the battery material strip respectively, thereby improving the accuracy and comprehensiveness of dust removal, thereby reducing the possibility of poor battery performance caused by dust contamination on the electrode.

[0135] The correction mechanism can be any suitable mechanism that can realize the correction function. In some embodiments, the correction mechanism may include but is not limited to a correction part, a collection component, etc. The collection component may include but is not limited to a camera, a rangefinder, etc., which is used to compare the collected pole piece information with the standard information to determine whether the pole piece is offset. If there is an offset, the correction part is controlled to move until the pole piece information is consistent with the standard information. In some embodiments, the number of the correction mechanism can be at least one. For example, the correction mechanism is located between the unwinding mechanism and the cutting mechanism, and is used to correct the uncut pole piece. For another example, the correction mechanism is located between the cutting mechanism and the slitting mechanism, and is used to correct the uncut pole piece. For another example, the correction mechanism includes a first correction mechanism and a second correction mechanism, the first correction mechanism is located between the unwinding mechanism and the cutting mechanism, and is used to correct the uncut current pole piece, and the second correction mechanism is located between the cutting mechanism and the slitting mechanism, and is used to correct the uncut current pole piece. In this way, by timely correcting the uncut pole pieces and / or unslit pole pieces, the possibility of uneven cutting and high scrap rate due to pole piece deviation is reduced.

[0136] The tension adjustment mechanism can be any suitable mechanism capable of adjusting tension. In some embodiments, there can be at least one such mechanism. For example, the number of such mechanisms can match the number of strips to be cut by the slitting mechanism. This allows for timely adjustment of the winding tension by the tension adjustment mechanism, thereby reducing the likelihood of electrode wrinkling, barreling, and uneven winding.

[0137] In the embodiment of the present disclosure, by integrating a mechanism with multiple functions in the die-cutting equipment, the functions of the die-cutting machine are enriched, and the die-cutting quality is improved while the die-cutting efficiency is improved, thereby improving the versatility and adaptability of the die-cutting machine.

[0138] FIG6 is a third schematic diagram of the structure of a die-cutting machine provided in an embodiment of the present disclosure. As shown in FIG6 , the die-cutting machine 10 includes an unwinding mechanism 11, a cutting mechanism 12, a visual inspection system 13, and a rewinding mechanism 14, which are sequentially arranged along the conveying direction of the battery electrode sheet. The die-cutting machine 10 also includes a slitting mechanism 15, a marking mechanism 16, a tension adjustment mechanism 17, a dust removal mechanism 18, and a correction mechanism 19, wherein:

[0139] Unwinding mechanism 11, used for releasing the pole piece;

[0140] The cutting mechanism 12 is used to cut the current electrode sheet released by the unwinding mechanism 11 to form electrode ears;

[0141] A visual inspection system 13 is used to collect images of the current electrode after cutting;

[0142] The cutting mechanism 12 is further configured to cut the next electrode piece in the first marking manner when the inspection result of the current electrode piece indicates that the current electrode piece has a defect;

[0143] The slitting mechanism 15 is located between the cutting mechanism 12 and the winding mechanism 14 and is used to slit the current electrode sheet along the length direction of the electrode sheet to form a plurality of electrode sheets (corresponding to the first part and the second part of the current electrode sheet);

[0144] The marking mechanism 16 is located between the visual inspection system 13 and the winding mechanism 14 and is used to mark the current electrode in a second marking manner when the inspection result of the current electrode indicates that the current electrode has a defect;

[0145] The dust removal mechanism 18 is located between the marking mechanism 16 and the tension adjustment mechanism 17 and is used to remove dust from the electrode pieces after slitting;

[0146] There are two deflection correction mechanisms 19, one located between the unwinding mechanism 11 and the cutting mechanism 12, for correcting the uncut pole pieces; the other located between the cutting mechanism 12 and the slitting mechanism 15, for correcting the uncut pole pieces;

[0147] The tension adjustment mechanism 17 is located between the dust removal mechanism 18 and the winding mechanism 14 and is used to adjust the winding tension of the winding mechanism 14 .

[0148] In the disclosed embodiment, firstly, by automatically detecting defects on the electrode sheet, the detection cost is reduced, and the detection efficiency and degree of automation are improved compared with manual detection; secondly, when the visual detection system detects that there is a defect in the electrode sheet, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous reset and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous reset and re-cutting), the length of unqualified electrode sheets is shortened, thereby reducing the possibility of electrode sheet waste, achieving the purpose of saving electrode sheets, and further reducing the manufacturing cost of the battery and improving the productivity of the equipment; on the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment; finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

[0149] FIG7 is a schematic diagram of an implementation flow of a die-cutting method according to an embodiment of the present disclosure. The die-cutting method is applied to a control device. As shown in FIG7 , the die-cutting method includes steps S71 to S73, wherein:

[0150] Step S71, controlling the visual inspection system of the die-cutting machine to collect an image of the current electrode; wherein the die-cutting machine includes an unwinding mechanism, a cutting mechanism, the visual inspection system and a winding mechanism sequentially arranged along the conveying direction of the electrode.

[0151] Here, the control device can be any suitable device, such as a host computer, a programmable logic controller (PLC), or a combination of a host computer and a programmable logic controller (PLC). In practice, the control device can be located within the die-cutting machine or can be independent of the die-cutting machine. The control device is communicatively connected to the die-cutting machine. The die-cutting machine can be any of the aforementioned die-cutting machines.

[0152] The visual inspection system includes at least one image acquisition device, which may include but is not limited to a camera. For example, the visual inspection system includes four cameras, each with different lighting methods to detect different defects in the electrode. For example, a die-cut backlit camera uses backlighting to detect defects such as lug size, folding, or damage, and electrode edge damage or holes. A die-cut camera uses a light source and camera for lighting, focusing on highlighting the film area, to detect defects such as metal leakage, wrinkles, decarburization, and scratches in the front coating of the electrode.

[0153] In some embodiments, the control device sends an acquisition instruction to the visual inspection system, so that the visual inspection system acquires an image of the current electrode based on the acquisition instruction. In this way, compared with real-time acquisition, the number of acquisition times is reduced and hardware consumption is reduced.

[0154] The current electrode refers to the electrode on the unwinding shaft that is transported to the collection position of the visual inspection system according to the transmission direction of the electrode.

[0155] Step S72: Determine the detection result of the current pole piece based on the image of the current pole piece.

[0156] Here, the inspection results of the current electrode piece may include but are not limited to the first inspection result and the second inspection result. The first inspection result indicates that the current electrode piece has a defect, and the second inspection result indicates that the current electrode piece does not have a defect. The defect of the electrode piece may be a defect of the electrode piece itself, such as: metal leakage in the film area, dark spots, dark marks, cracks, etc., or it may be a defect not in the electrode piece itself, such as: tab excess material / breakage / folding, straight edge excess material / breakage, splicing, etc.

[0157] In some embodiments, the captured image is compared with a corresponding standard image to obtain a detection result for the current electrode. In some embodiments, the image of the current electrode can be recognized using any suitable neural network or model to obtain the detection result for the current electrode. The neural network / model can be trained using a training sample set. The training sample set can include sample images with different defects and sample images without defects.

[0158] In some embodiments, the visual inspection system includes multiple image acquisition devices. During implementation, the control device determines the inspection result of the current electrode piece based on the image of the current electrode piece captured by each image acquisition device. In some embodiments, if the inspection result determined by the image of the current electrode piece captured by at least one image acquisition device is a first inspection result, the first inspection result is used as the inspection result of the current electrode piece; if the inspection result determined by the image of the current electrode piece captured by each image acquisition device is a second inspection result, the second inspection result is used as the inspection result of the current electrode piece. In this way, the inspection result of the electrode piece is determined based on multiple images captured by the visual inspection system, thereby improving the accuracy of the inspection result.

[0159] Step S73: When the inspection result of the current electrode sheet indicates that the current electrode sheet has a defect, control the cutting mechanism to cut the next electrode sheet in a first marking manner; wherein the cutting position corresponding to the next electrode sheet serves as the end position of the current battery electrode segment and the starting position of the next battery electrode segment, and the length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment is less than the length of one battery electrode segment.

[0160] Here, the next electrode piece refers to the electrode piece on the unwinding shaft that is transferred to the cutting mechanism according to the transfer direction of the electrode piece. The next electrode piece is the electrode piece after the current electrode piece.

[0161] The cutting position corresponding to the next electrode piece refers to the position where the next electrode piece is cut in the first marking method. The first marking method can be any suitable marking method. For example, a pattern, a cutting distance, a cutting method, etc. For example, only a part of the electrode ear is cut. In some embodiments, the starting mark and the ending mark of the electrode segment can also be cut by the first marking method. In some embodiments, the starting mark and the ending mark of the electrode segment can be the same or different. For example, the starting mark of the electrode segment is that the corresponding electrode ear lacks the upper right corner, and the ending mark of the electrode segment can be that the corresponding electrode ear lacks the upper left corner. For another example, the starting mark and the ending mark of the electrode segment are not that the corresponding electrode ear lacks the upper left corner.

[0162] The starting position of the current battery electrode segment may be the current electrode piece, or a certain electrode piece before the current electrode piece.

[0163] In some embodiments, the control device sends a reset re-cutting signal to the cutting mechanism, so that the cutting mechanism marks the next pole piece in the first marking manner based on the reset re-cutting signal. The reset re-cutting signal can be any suitable signal. The reset re-cutting signal is used to timely mark the end of cutting the pole piece.

[0164] In some embodiments, different defects correspond to the same or different processing methods. The processing methods may include but are not limited to alarm processing, shutdown processing, marking processing, re-switching processing, etc. In implementation, when the processing method corresponding to the defect is re-switching processing, the control device generates the reset re-switching signal.

[0165] In the disclosed embodiment, firstly, by automatically detecting defects on the electrode sheet, the detection cost is reduced, and the detection efficiency and degree of automation are improved compared with manual detection; secondly, when the visual detection system detects that there is a defect in the electrode sheet, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous reset and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous reset and re-cutting), the length of unqualified electrode sheets is shortened, thereby reducing the possibility of electrode sheet waste, achieving the purpose of saving electrode sheets, and further reducing the manufacturing cost of the battery and improving the productivity of the equipment; on the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment; finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

[0166] In some embodiments, the step S73 of “controlling the cutting mechanism to cut the next electrode in the first marking manner” includes steps S731 to S732, wherein:

[0167] Step S731: Generate a reset and re-switching signal based on the defect of the current electrode.

[0168] Here, the handling methods corresponding to different defects can be the same or different. During implementation, the handling method corresponding to the defect can include at least one handling method. The handling methods may include, but are not limited to, alarm handling, shutdown handling, marking handling, and re-switching handling. During implementation, when the handling method corresponding to the defect is re-switching handling, the reset re-switching signal is generated.

[0169] In some embodiments, a correspondence between defects and treatment methods can be pre-established, and then, based on the correspondence, the target treatment method corresponding to the defect of the current electrode can be obtained. In some embodiments, the correspondence can be established through any suitable means such as a configuration file, a configuration interface, etc.

[0170] In some embodiments, step S731 includes steps S7311 to S7312, wherein:

[0171] Step S7311: using the preset corresponding relationship, determine the target processing method corresponding to the defect of the current electrode.

[0172] Here, the correspondence relationship represents the relationship between at least one defect and at least one treatment method. The treatment method may include, but is not limited to, at least one of an alarm treatment, a shutdown treatment, a marking treatment, and a re-cut treatment. During implementation, the correspondence relationship can be used to obtain the target treatment method corresponding to the current electrode defect. The target treatment method may include at least one treatment method, for example, a marking treatment and a re-cut treatment.

[0173] Step S7312: When the target processing method includes re-switching processing, generate the reset re-switching signal.

[0174] Here, the reset and reswitching signal can be any suitable signal. In some embodiments, the reset and reswitching signal can be the same as or different from the signal indicating the start of the pole segment. In implementation, when the control device determines that the defect of the current pole segment corresponds to a treatment method that includes the reswitching treatment, the reset and reswitching signal is automatically generated.

[0175] In this way, on the one hand, the target processing method corresponding to the defect is determined according to the corresponding relationship, which improves the accuracy and flexibility of the target processing method; on the other hand, the reset re-cutting signal is generated only when the pole piece needs to be re-cut, which improves the targeted re-cutting treatment of the pole piece.

[0176] Step S732: Send the reset and re-cut signal to the cutting mechanism, so that the cutting mechanism cuts the next pole piece in the first marking manner based on the reset and re-cut signal.

[0177] Here, the control device can be directly connected to the cutting mechanism for communication. In practice, the cutting mechanism can cut the next pole piece with reference to the above embodiment.

[0178] In some embodiments, step S732 includes step S7321 and / or step S7322, wherein:

[0179] Step S7321: When the distance between the defect of the current pole piece and the first edge of the current pole piece meets the distance condition, the reset re-cutting signal is sent to the first cutting device in the cutting mechanism, so that the first cutting device cuts the first edge of the next pole piece in the first marking manner based on the reset re-cutting signal.

[0180] Here, the first cutting device may include but is not limited to a cutter, a cutting head, etc. The first cutting device is used to cut the blank area of ​​the first edge of the electrode piece to form the electrode ear.

[0181] The distance condition may be any suitable condition, for example, less than a distance threshold. The distance threshold may be any suitable value, for example, half the width of the pole piece.

[0182] In some embodiments, since the defect may be irregular, the first distance between the minimum circumscribed rectangle of the defect and the first edge may be used as the distance between the defect and the first edge of the pole piece. The first distance may refer to the distance between the first edge of the pole piece and the set side (parallel to the first edge) of the minimum circumscribed rectangle. The set side may include but is not limited to the upper side, the lower side, the middle side, etc. For example, if the distance between the first edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than the distance threshold, the reset re-cut signal is sent to the first cutting device.

[0183] Step S7322: When the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, the reset re-cutting signal is sent to the second cutting device in the cutting mechanism, so that the second cutting device cuts the second edge of the next pole piece in the first marking manner based on the reset re-cutting signal; wherein the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

[0184] Here, the second cutting device may include but is not limited to a cutter, a cutting head, etc. The second cutting device is used to cut the blank area of ​​the second edge of the electrode piece to form a pole ear.

[0185] During implementation, since the defect may be irregular, the first distance between the minimum circumscribed rectangle of the defect and the second edge can be used as the distance between the defect and the second edge of the pole piece. The second distance can refer to the distance between the second edge of the pole piece and the set side (parallel to the first edge) of the minimum circumscribed rectangle. The set side can include but is not limited to the upper side, the lower side, the middle side, etc. For example, if the distance between the second edge of the pole piece and the lower side of the minimum circumscribed rectangle is less than the distance threshold, the reset re-cut signal is sent to the second cutting device.

[0186] In this way, firstly, different edges of the pole piece are cut respectively by two independent cutting mechanisms, which reduces the interference between each other; secondly, the corresponding cutting mechanism is selected according to the distance between the defect position and the edge of the pole piece to perform the end cutting of the pole piece, which improves the accuracy and targeting of the cutting and shortens the length of the unqualified pole piece on the corresponding side, thereby reducing the possibility of pole piece waste while also improving production efficiency; finally, the end of the pole piece is marked in time according to the reset re-cutting signal, which improves the accuracy of the marking.

[0187] In the disclosed embodiment, a reset and re-cut signal is generated based on the defect of the current pole piece; the reset and re-cut signal is transmitted to the cutting mechanism, causing the cutting mechanism to cut the next pole piece in the first marking manner based on the reset and re-cut signal. Thus, on the one hand, generating a reset and re-cut signal based on the defect of the pole piece enables reset and re-cutting for the set defect, improving the accuracy, timeliness, and pertinence of the reset and re-cut signal. On the other hand, the cutting mechanism timely marks the end of the pole piece based on the reset and re-cut signal, improving the accuracy of the marking.

[0188] In some embodiments, the die-cutting method further comprises step S74, wherein:

[0189] Step S74: Based on the defect of the current electrode, control the marking mechanism to mark the current electrode in a second marking manner.

[0190] Here, the second marking method indicates that the battery segment in which the current electrode is located is a defective battery segment. The marking mechanism can be any suitable mechanism capable of marking the electrode, such as a laser marker, a color marker, or a pattern marker. In some embodiments, there can be at least one marking mechanism. For example, the marking mechanism can mark a yellow mark to indicate that the battery segment in which the current electrode is located is a defective battery segment.

[0191] In some embodiments, step S74 includes steps S741 to S742, wherein:

[0192] Step S741: using a preset corresponding relationship, determine a target processing method corresponding to the defect of the current electrode.

[0193] Here, the corresponding relationship represents the relationship between at least one defect and at least one processing method. During implementation, the method for determining the target processing method corresponding to the defect can refer to the determination method of the aforementioned step S7311.

[0194] Step S742: When the target processing method includes marking processing, control the marking mechanism to mark the current electrode in the second marking method.

[0195] Here, if the target processing method includes marking processing, the control device generates the marking signal and sends the marking signal to the marking mechanism, so that the marking mechanism marks the current electrode segment in the second marking method based on the marking signal. The marking signal can be any suitable signal. The marking signal is used to promptly mark the electrode segment as an unqualified electrode segment.

[0196] In some embodiments, the control device locates the position of the current pole piece based on at least one output signal sent by the encoding device, and when the current pole piece is transmitted to the marking range of the marking mechanism, the marking signal is sent to the marking mechanism so that the marking mechanism can mark the current pole piece in a timely manner.

[0197] In this way, on the one hand, the target processing method corresponding to the defect is determined according to the corresponding relationship, which improves the accuracy and flexibility of the target processing method; on the other hand, the electrode is marked only when it needs to be marked, which improves the targetedness of the electrode marking treatment.

[0198] In some embodiments, step S74 includes step S743 and / or step S744, wherein:

[0199] Step S743: When the defect of the current pole piece is located in the first part of the current pole piece, control the first marking mechanism in the marking mechanism to mark the first part of the current pole piece in a second marking manner.

[0200] Here, when the control device performs defect detection based on the image of the current pole piece, it can obtain whether the current pole piece has a defect, the location of the defect, etc.

[0201] The first portion of the current electrode sheet includes at least the first edge of the current electrode sheet. If the distance between the defect and the first edge of the current electrode sheet satisfies the distance condition, it indicates that the defect is located in the first portion. During implementation, the control device can communicate directly with the first marking mechanism. The control device can send a marking signal to the first marking mechanism, causing the first marking mechanism to mark the first portion of the current electrode sheet using the second marking method.

[0202] Step S744: When the defect of the current pole piece is located in the second part of the current pole piece, control the second marking mechanism in the marking mechanism to mark the second part of the current pole piece in a second marking manner.

[0203] Here, the second portion of the current electrode sheet includes at least the second edge of the current electrode sheet. If the distance between the defect and the second edge of the current electrode sheet satisfies the distance condition, it indicates that the defect is located in the second portion. During implementation, the control device can directly communicate with the second marking mechanism. The control device can send a marking signal to the second marking mechanism, so that the second marking mechanism marks the second portion of the current electrode sheet in the second marking manner.

[0204] In this way, the corresponding marking mechanism is selected according to the location of the defect to mark the unqualified pole segments, which improves the accuracy and pertinence of the marking, so as to facilitate the subsequent accurate removal of unqualified pole segments.

[0205] In the disclosed embodiment, based on the defect of the current electrode piece, the marking mechanism is controlled to mark the current electrode piece in the second marking mode. In this way, the marking mechanism is used to promptly mark defective electrode pieces as unqualified, so that unqualified electrode pieces can be accurately removed later.

[0206] In some embodiments, the die-cutting method further includes steps S751 to S752, wherein:

[0207] Step S751: displaying a configuration interface, wherein the configuration interface includes a configuration area, and the configuration area is used to configure a relationship between at least one defect and at least one processing method.

[0208] Here, the configuration interface is an interactive interface for performing configuration operations and displaying information. The configuration interface may include, but is not limited to, areas where configuration operations can be performed, operation controls, and the like. The areas where configuration operations can be performed may include, but are not limited to, at least one of an area for configuring defects and treatment methods, an area for configuring dimensions, and an area for configuring other information. During implementation, those skilled in the art may determine the number of areas within the configuration interface where configuration operations can be performed, as well as the specific layout of each area within the configuration interface where configuration operations can be performed, based on actual circumstances, and this disclosure does not limit this.

[0209] The operation control can be any suitable control that can be operated. For example, an edit control, a new control, a save control, etc. During implementation, those skilled in the art can determine the number of operation controls and the location of each operation control in the configuration interface based on actual circumstances, and the embodiments of this disclosure are not limited thereto.

[0210] The configuration area is at least used to configure defects and treatment methods. In some embodiments, the configuration area can also configure size and treatment methods, configure other information, etc.

[0211] The configuration interface can be displayed on any suitable electronic device with an interface interaction function, for example, a laptop computer, a mobile phone, a tablet computer, a PDA, a personal digital assistant, a digital television, or a desktop computer. In practice, the electronic device displaying the configuration interface and the electronic device performing the die-cutting method can be the same or different, and this is not limited here.

[0212] FIG8 is a first schematic diagram of a configuration interface provided by an embodiment of the present disclosure. As shown in FIG8 , the configuration interface 80 includes a configuration area 81 , which is used to configure different defects and corresponding processing methods.

[0213] Step S752: Determine the corresponding relationship in response to the configuration operation performed in the configuration area.

[0214] Here, based on the configuration operation, a correspondence between each defect and the corresponding processing method is generated. The processing method corresponding to each defect may include at least one processing method. During implementation, different defects may correspond to the same or different processing methods.

[0215] FIG9 is a second schematic diagram of a configuration interface provided by an embodiment of the present disclosure. As shown in FIG9 , configuration interface 80 includes a configuration area 81 and a save control 82. Configuration area 81 includes a list 83, which displays at least one defect and at least one treatment method. Configuration area 81 also allows for configuration between size and treatment method, as well as configuration of other information. Save control 82 is used to save each defect and corresponding treatment method in list 83.

[0216] In the embodiment of the present disclosure, the corresponding relationship is configured through a visual interface, which simplifies the operation steps and improves the accuracy of the corresponding relationship.

[0217] It should be understood that references to "one embodiment" or "an embodiment" throughout this specification mean that specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present disclosure. Therefore, the appearance of "in one embodiment" or "in an embodiment" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the present disclosure, the order of execution of the above-mentioned processes does not necessarily indicate a precedence in execution. The execution order of each process should be determined by its function and inherent logic and should not constitute any limitation on the implementation of the embodiments of the present disclosure. The above-mentioned numbers of the embodiments of the present disclosure are for descriptive purposes and do not represent the superiority or inferiority of the embodiments. It should be noted that, in this document, the terms "comprise," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprises an..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising such elements.

[0218] In the several embodiments provided in this disclosure, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are illustrative. For example, the division of the units described is a logical functional division. In actual implementation, other division methods may be used, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not implemented. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms. The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, the functional units in the embodiments of this disclosure can be all integrated into a processing unit, or each unit can be a separate unit, or two or more units can be integrated into a single unit; the above-mentioned integrated units can be implemented in the form of hardware or hardware plus software functional units.

[0219] The above is an implementation mode of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present disclosure, and they should all be covered by the protection scope of the present disclosure. Industrial Applicability

[0220] The present disclosure provides a die-cutting method and a die-cutting machine, which include an unwinding mechanism, a cutting mechanism, a visual inspection system, and a rewinding mechanism sequentially arranged along the conveying direction of the electrode sheet. The visual inspection system is used to collect an image of the current electrode sheet after cutting; the cutting mechanism is also used to cut the next electrode sheet in a first marking manner when the inspection result of the current electrode sheet indicates that the current electrode sheet has a defect. The inspection result of the current electrode sheet is determined based on the image of the current electrode sheet. The cutting position corresponding to the next electrode sheet serves as the end position of the current battery electrode segment and the starting position of the next battery electrode segment. The length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment is less than the length of one battery electrode segment. In this way, firstly, by automatically detecting defects in the electrode, the cost of detection is reduced, and the detection efficiency and degree of automation are improved compared with manual detection; secondly, when the visual inspection system detects that there are defects in the electrode, the cutting mechanism is used to promptly complete the cutting of the electrode segment, thereby realizing asynchronous reset and re-cutting. On the one hand, compared with cutting the length of the entire electrode segment (i.e., synchronous reset and re-cutting), the length of unqualified electrode is shortened, thereby reducing the possibility of electrode waste, achieving the purpose of saving electrode, and thus reducing the manufacturing cost of the battery and improving the productivity of the equipment; on the other hand, compared with adding a separate marking device for marking and / or adding a new detection system for defect detection before the cutting mechanism, the cost of the equipment is reduced while also reducing the complexity of the equipment; finally, all cut electrode sheets are promptly reeled in by the reeling mechanism, thereby improving the accuracy of the die-cutting machine operation and meeting the production requirements of high timeliness and high efficiency.

Claims

1. A die-cutting machine, comprising an unwinding mechanism, a cutting mechanism, a visual inspection system, and a rewinding mechanism sequentially arranged along the conveying direction of the electrode sheet, wherein: The unwinding mechanism is used to release the pole piece; The cutting mechanism is used to cut the current electrode sheet released by the unwinding mechanism to form electrode ears; The visual inspection system is used to collect images of the current electrode after cutting; The cutting mechanism is further configured to cut a next electrode piece in a first marking manner if a detection result of the current electrode piece indicates that the current electrode piece has a defect, the detection result of the current electrode piece being determined based on an image of the current electrode piece, a cutting position corresponding to the next electrode piece serving as an end position of the current battery electrode segment and a starting position of a next battery electrode segment, and a length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment being less than a length of one battery electrode segment; The winding mechanism is used to wind up the current pole piece.

2. The die-cutting machine according to claim 1, wherein: The cutting mechanism is further used to cut the next pole piece in the first marking manner based on the received reset and re-cut signal when the detection result of the current pole piece indicates that the current pole piece has a defect; wherein the reset and re-cut signal is generated based on the defect of the current pole piece.

3. The die-cutting machine according to claim 1 or 2, wherein: The cutting mechanism includes a first cutting device and a second cutting device; The first cutting device is configured to cut the first edge of the current electrode piece to form an electrode lug, and to cut the first edge of the next electrode piece in the first marking manner when the distance between the defect of the current electrode piece and the first edge of the current electrode piece meets a distance condition; The second cutting device is used to cut the second edge of the current pole piece to form a pole ear, and when the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, cut the second edge of the next pole piece in the first marking manner, and the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

4. The die-cutting machine according to any one of claims 1 to 3, wherein: The die-cutting machine also includes a slitting mechanism and a marking mechanism; The slitting mechanism is located between the cutting mechanism and the marking mechanism, and is used to slit the current electrode into a first part and a second part along the length direction of the electrode; The marking mechanism is located between the visual inspection system and the winding mechanism, and is used to mark the current pole piece in a second marking manner when the inspection result of the current pole piece indicates that the current pole piece has a defect. The second marking manner indicates that the battery pole segment in which the current pole piece is located is a defective battery pole segment.

5. The die-cutting machine according to claim 4, wherein: The slitting mechanism includes a slitting frame and a cutter located on the slitting frame; The cutter on the cutting machine frame is used to cut the current pole piece into a first part and a second part along the length direction of the pole piece.

6. The die-cutting machine according to claim 4 or 5, wherein: The die-cutting machine further comprises an encoding device; The encoding device is used to send at least one output signal to a preset control device, so that the control device controls the marking mechanism to mark the current pole piece in the second marking manner based on the at least one output signal.

7. The die-cutting machine according to any one of claims 4 to 6, wherein: The marking mechanism includes a first marking mechanism and a second marking mechanism, and the winding mechanism includes a first winding mechanism and a second winding mechanism; The first marking mechanism is configured to mark the first portion of the current pole piece in the second marking manner when the defect of the current pole piece is located in the first portion of the current pole piece; The first winding mechanism is used to wind up the first part of the current pole piece; The second marking mechanism is configured to mark the second portion of the current pole piece in the second marking manner when the defect of the current pole piece is located in the second portion of the current pole piece; The second winding mechanism is used to wind up the second part of the current pole piece.

8. The die-cutting machine according to claim 7, wherein: The visual inspection system includes a first image acquisition device, a second image acquisition device, a third image acquisition device and a fourth image acquisition device sequentially arranged along the conveying direction of the pole piece, and the visual inspection system also includes a fifth image acquisition device and a sixth image acquisition device; The first image acquisition device, the second image acquisition device, the third image acquisition device and the fourth image acquisition device are all located between the cutting mechanism and the slitting mechanism, and are used to acquire images of the current electrode after cutting; The fifth image acquisition device is located between the slitting mechanism and the first marking mechanism, and is used to acquire an image of the first part of the current electrode after slitting; The sixth image acquisition device is located between the cutting mechanism and the second marking mechanism, and is used to capture the current image after cutting. Image of the second part of the pole piece.

9. The die-cutting machine according to any one of claims 4 to 8, wherein: The die-cutting machine further comprises at least one of the following: a dust removal mechanism, a deviation correction mechanism, and a tension adjustment mechanism; The dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism and is used to remove dust on the current electrode after cutting is completed; The deflection correction mechanism is located between the unwinding mechanism and the cutting mechanism, and / or between the cutting mechanism and the slitting mechanism, and is used to correct the deflection of the current electrode; The tension adjustment mechanism is located between the dust removal mechanism and the winding mechanism, and is used to adjust the winding tension of the winding mechanism.

10. The die-cutting machine according to claim 9, wherein: The dust removal mechanism includes a first dust removal mechanism and a second dust removal mechanism; The first dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the first surface of the current electrode after cutting; The second dust removal mechanism is located between the marking mechanism and the tension adjustment mechanism, and is used to remove dust on the second surface of the current electrode after cutting is completed.

11. The die-cutting machine according to claim 9 or 10, wherein: The correction mechanism includes a first correction mechanism and a second correction mechanism; The first deviation-correcting mechanism is located between the unwinding mechanism and the cutting mechanism, and is used to correct the deviation of the current uncut pole piece; The second deflection-correcting mechanism is located between the cutting mechanism and the slitting mechanism, and is used to correct the deflection of the current electrode that has not been slit.

12. A die-cutting method, comprising: Controlling the visual inspection system of the die-cutting machine to collect an image of the current electrode; wherein the die-cutting machine includes an unwinding mechanism, a cutting mechanism, the visual inspection system, and a rewinding mechanism sequentially arranged along the conveying direction of the electrode; Determining a detection result of the current pole piece based on the image of the current pole piece; When the inspection result of the current electrode sheet indicates that the current electrode sheet has a defect, the cutting mechanism is controlled to cut the next electrode sheet in a first marking manner; wherein the cutting position corresponding to the next electrode sheet serves as the end position of the current battery electrode segment and the starting position of the next battery electrode segment, and the length between the starting position of the next battery electrode segment and the starting position of the current battery electrode segment is less than the length of one battery electrode segment.

13. The die-cutting method according to claim 12, wherein: The visual inspection system includes a plurality of image acquisition devices, and the image of the current pole piece includes the image of the current pole piece acquired by each of the image acquisition devices; The determining of the detection result of the current pole piece based on the image of the current pole piece includes: Based on the image of the current pole piece captured by each of the image acquisition devices, a detection result of the current pole piece is determined.

14. The die-cutting method according to claim 12 or 13, wherein: The controlling the cutting mechanism to cut the next electrode piece in the first marking manner includes: Based on the defect of the current pole piece, generating a reset and re-switching signal; The reset and re-cut signal is sent to the cutting mechanism, so that the cutting mechanism cuts the next pole piece in the first marking manner based on the reset and re-cut signal.

15. The die-cutting method according to claim 14, wherein: The generating of a reset and re-switching signal based on the defect of the current pole piece includes: Determining a target processing method corresponding to the defect of the current electrode by using a preset corresponding relationship; wherein the corresponding relationship represents a relationship between at least one defect and at least one processing method, and the at least one processing method includes at least one of the following: alarm processing, shutdown processing, marking processing, and re-cut processing; In a case where the target processing mode includes a re-switching process, the reset re-switching signal is generated.

16. The die-cutting method according to claim 15, wherein: The die-cutting method comprises: Displaying a configuration interface, the configuration interface including a configuration area, the configuration area being used to configure a relationship between at least one defect and at least one processing method; The corresponding relationship is determined in response to a configuration operation performed in the configuration area.

17. The die-cutting method according to any one of claims 14 to 16, wherein: The step of sending the reset and re-cut signal to the cutting mechanism so that the cutting mechanism cuts the next pole piece in the first marking manner based on the reset and re-cut signal comprises at least one of the following: When the distance between the defect of the current pole piece and the first edge of the current pole piece meets the distance condition, the A reset and re-cut signal is sent to a first cutting device in the cutting mechanism, so that the first cutting device cuts the first edge of the next pole piece in the first marking manner based on the reset and re-cut signal; When the distance between the defect of the current pole piece and the second edge of the current pole piece meets the distance condition, the reset re-cutting signal is sent to the second cutting device in the cutting mechanism, so that the second cutting device cuts the second edge of the next pole piece in the first marking manner based on the reset re-cutting signal; wherein the second edge of the current pole piece and the first edge of the current pole piece are arranged along the width direction of the pole piece.

18. The die-cutting method according to any one of claims 12 to 17, wherein: The die-cutting method further comprises: Based on the defect of the current pole piece, the marking mechanism is controlled to mark the current pole piece in a second marking method; wherein, the marking mechanism is located between the visual inspection system and the winding mechanism, and the second marking method indicates that the battery pole segment in which the current pole piece is located is a defective battery pole segment.

19. The die-cutting method according to claim 18, wherein: The controlling the marking mechanism to mark the current pole piece in a second marking manner based on the defect of the current pole piece includes: Determining a target processing method corresponding to the defect of the current electrode by using a preset corresponding relationship; wherein the corresponding relationship represents a relationship between at least one defect and at least one processing method, and the at least one processing method includes at least one of the following: alarm processing, shutdown processing, marking processing, and re-cut processing; In a case where the target processing method includes marking processing, the marking mechanism is controlled to mark the current electrode in the second marking method.

20. The die-cutting method according to claim 19, wherein: The controlling the marking mechanism to mark the current electrode in the second marking manner includes at least one of the following: When the defect of the current pole piece is located in the first part of the current pole piece, controlling the first marking mechanism in the marking mechanism to mark the first part of the current pole piece in a second marking manner; When the defect of the current pole piece is located in the second part of the current pole piece, controlling the second marking mechanism in the marking mechanism to mark the second part of the current pole piece in a second marking manner; The first part of the current electrode sheet and the second part of the current electrode sheet are obtained by cutting the current electrode sheet along the length direction of the electrode sheet by the cutting mechanism of the die-cutting machine, and the cutting mechanism is located between the cutting mechanism and the marking mechanism.

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