Electrode sheet slitting system and method

Abstract

An electrode sheet slitting system (1000), comprising: an electrode sheet cutting device (200) used for slitting a first electrode sheet (110) to form a plurality of second electrode sheets (120), wherein the width of the first electrode sheet (110) is greater than the width of each second electrode sheet (120); an information acquisition module (300) used for acquiring information of the second electrode sheets (120); and a processor (700) used for obtaining the information and determining, according to the information, whether a deviation occurs in the second electrode sheets (120), wherein in the event of a deviation, the processor (700) performs deviation correction on the first electrode sheet (110). Also provided is an electrode sheet slitting method. The electrode sheet slitting system (1000) and method reduce the batch scrap of electrode sheets and the flow of defective electrode sheets into subsequent production processes.

Description

Pole cutting system and method

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202311650176.7, filed on December 4, 2023, entitled “Pole Slitting System and Method,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery production technology, and in particular to a slitting system and method in the production process of battery pole pieces. Background Art

[0004] The production process for battery cell electrodes includes pre-processing steps such as slurry mixing, coating, cold pressing, pre-slitting, and die-cutting. The coating process involves evenly applying the slurry to the surface of the current collector. After drying, the positive and negative electrode strips are formed and rolled up. After coating, the cold pressing process begins, where rollers are used to roll the electrode strips, compacting the porous coating and firmly bonding it to the foil. This results in a electrode with thickness and compaction density that meet specification requirements.

[0005] During the production process, electrodes are typically conveyed via rollers and other equipment. For example, in wound battery cell electrode slitting, a cutter cuts the electrode into two sections. The two sections are then reeled separately along upper and lower flat rollers, resulting in two rolls. Current slitting equipment manually corrects electrode width deviations and cosmetic defects, making real-time adjustments impossible. This often results in batch scrapping, impacting subsequent production yields and reducing production efficiency.

[0006] Application Contents

[0007] To this end, the present application provides a pole piece slitting system and slitting method for real-time detection of pole piece offset. During the pole piece slitting production process, a closed-loop automatic pole piece deviation correction can be implemented to improve the consistency of battery cell capacity and reduce batch pole piece scrapping. This improves pole piece yield and production efficiency, ensures personnel safety, and improves battery performance. The present application includes the following technical solutions:

[0008] On the one hand, the present application provides a pole piece cutting system, comprising: a pole piece cutting device, an information acquisition module and a processor, the pole piece cutting device being used to cut a first pole piece into a plurality of second pole pieces, wherein the width of the first pole piece is greater than that of the second pole piece; the information acquisition module being used to collect information of the second pole piece; the processor being used to obtain information and determine whether the second pole piece is offset based on the information, and in the event of an offset, the processor corrects the first pole piece.

[0009] The electrode slitting system proposed in this application can detect electrode information in real time during the battery cell electrode slitting process. Compared to manual spot checks followed by manual correction, this reduces batch scrapping of electrodes. It also reduces production costs, including labor and materials. Furthermore, it reduces contact between personnel and machinery, ensuring personnel safety.

[0010] In some implementations, the information acquisition module includes an image acquisition module.

[0011] The image acquisition module has both cost and performance advantages compared to other information acquisition systems, is highly mature, and is easy to apply in industry.

[0012] In some implementations, the image acquisition module is a charge coupled device camera.

[0013] Charge-coupled device cameras are widely used in product quality inspection in industrial production due to their advantages of high imaging quality, low noise, high sensitivity and fast reading.

[0014] In some implementations, the electrode slitting system further includes a first roller and a second roller. The plurality of second electrode pieces are sequentially numbered, wherein the first roller and the second roller are respectively used to transport the odd-numbered second electrode pieces and the even-numbered second electrode pieces after slitting.

[0015] Each of the first and second rollers transports multiple second pole pieces, using only two rollers to transport them in two directions. Compared to a design where each second pole piece is transported in a different direction using a separate roller, this design saves system space, is simpler in structure, and is easier to manufacture.

[0016] In some implementations, the information collection module includes a first information collection submodule for collecting information of odd-numbered second pole pieces at the first roller.

[0017] In some implementations, the information collection module further includes a second information collection submodule configured to collect information of even-numbered second pole pieces at the second roller.

[0018] The information collection module collects information about the pole piece at the roller axis, rather than at other locations along the pole piece's conveying direction. Because the pole piece's motion at the roller axis is more stable, the accuracy and quality of the information collected can be improved.

[0019] In some implementations, the information of the second pole piece includes a width of the second pole piece, and accordingly, the offset includes a width offset, wherein a direction of the width is a direction perpendicular to a transmission direction of the second pole piece.

[0020] Compared with the information of angle offset, width offset is easier to obtain and process. By judging the width offset, whether correction is needed is determined. It has low complexity and is easy to implement.

[0021] In some implementations, determining whether a width offset occurs includes: the processor calculating the offset of the width of the second pole piece compared to the standard width, and determining that a width offset occurs if the width offset is greater than a width offset error lower limit threshold.

[0022] In some implementations, if the width offset is less than the width offset error upper limit threshold, the processor calculates a correction value. Accordingly, the processor corrects the first pole piece, including correcting the first pole piece according to the correction value.

[0023] The error of the width deviation of each second pole piece is compared with the determined standard width, and the error is the correction value. The method is simple and convenient for the processor to calculate the correction value and correct the first pole piece.

[0024] In some implementations, if the width offset error is greater than or equal to a width offset upper threshold, the system issues an alarm.

[0025] When the second electrode exceeds the upper limit of the width error threshold, it is a defective product. At this time, an alarm is triggered and the machine is shut down, which makes it convenient for operators to deal with the electrode to be scrapped in time, thereby improving production efficiency.

[0026] In some implementations, the system further includes a third roller for conveying the first pole piece. Accordingly, the information acquisition module further includes a third information acquisition submodule for acquiring information of the first pole piece at the third roller.

[0027] In some implementations, the first pole piece includes a first surface and a second surface, and the third information collection submodule collects information of the first surface of the first pole piece.

[0028] In some implementations, the second pole piece includes a first surface and a second surface, and the first information acquisition submodule and the second information acquisition submodule respectively acquire information of the second surface of the second pole piece.

[0029] Compared with the solution of collecting information on both sides of each electrode, the above implementation method can not only completely collect information on the first and second sides of the electrode, but also save system space and reduce the number of information collection modules.

[0030] In some implementations, the information of the first pole piece and / or the second pole piece also includes appearance information. Based on the appearance information, the processor is also used to determine whether the first pole piece and / or the second pole piece has appearance defects; if appearance defects occur, the alarm is notified to sound an alarm.

[0031] Detecting appearance defects during the deviation correction process improves the utilization rate of the information acquisition module. Real-time detection of appearance defects reduces the outflow of defective electrodes. Prompt alarms when defects occur facilitate troubleshooting and locating faults.

[0032] In some implementations, the information acquisition module further includes a light source for providing supplemental illumination to the image acquisition module. This easily adjustable light source not only makes the captured image clearer, but also allows for the acquisition of multiple frames of image information under different lighting conditions, thereby improving detection accuracy.

[0033] In some implementations, the line from the center of the first roller to the radius of the contact point between the second pole piece and the first roller is the center line between the line from the image acquisition module to the contact point and the line from the light source to the contact point. This arrangement facilitates coordinated adjustment of the image acquisition module and the light source.

[0034] On the other hand, the present application provides a pole piece cutting method, including: cutting a first pole piece into multiple second pole pieces, wherein the width of the first pole piece is greater than that of the second pole piece; collecting information of the second pole piece; and obtaining the information and determining whether the second pole piece is offset based on the information, and correcting the first pole piece if an offset occurs.

[0035] The electrode slitting method proposed in this application detects the offset of the electrode in real time during the battery cell electrode slitting process. Compared with manual correction after manual sampling, it reduces the batch scrapping of electrodes, improves the yield rate of electrode slitting, reduces production costs such as labor and materials, and at the same time reduces the contact between personnel and machines, ensuring personnel safety.

[0036] In some implementations, two rollers, a first roller and a second roller, are used to respectively convey the odd-numbered second pole pieces and the even-numbered second pole pieces after slitting.

[0037] The multiple second pole pieces after being cut are transported in two directions. Compared with the method of using a roller to transport each second pole piece in different directions, this method saves more system space and is easier to design in terms of structure.

[0038] In some implementations, collecting information about the second pole pieces includes collecting information about odd-numbered second pole pieces at the first roller and information about even-numbered second pole pieces at the second roller.

[0039] Since the motion state of the pole piece at the roller shaft is relatively stable, collecting information of the pole piece at the roller shaft can improve the quality of information collection.

[0040] In some implementations, the information of the second pole piece includes a width of the second pole piece, and accordingly, the offset includes a width offset, wherein a direction of the width is a direction perpendicular to a transmission direction of the second pole piece.

[0041] Compared with the information of angle offset, width offset is easier to obtain and process. By judging the width offset, whether correction is needed is determined. It has low complexity and is easy to implement.

[0042] In some implementations, the pole piece cutting method further includes collecting information of the first pole piece.

[0043] Before making corrections, the electrodes are inspected for appearance defects, which allows personnel to handle defective electrodes in a timely manner, thereby improving the yield rate of production.

[0044] In some implementations, the pole piece cutting method further includes: the information of the first pole piece and / or the second pole piece also includes appearance information, and determining whether the first pole piece and / or the second pole piece has appearance defects based on the appearance information; and if appearance defects occur, an alarm is issued.

[0045] Detecting appearance defects during the deviation correction process facilitates effective correction. Real-time detection of appearance defects reduces the flow of defective products into subsequent processes, helping to ensure battery performance. Prompt alarms when defects occur facilitate troubleshooting and problem location.

[0046] In some implementations, the appearance information includes appearance information of the first surface and the second surface of the first pole piece and the second pole piece.

[0047] In some implementations, the appearance information includes appearance information of a first surface of the first pole piece and appearance information of a second surface of the second pole piece.

[0048] In this way, the information of the first and second surfaces of the electrode can be completely collected, and there is no need to collect information on both sides of the first electrode and each second electrode, thereby reducing the waste of resources caused by repeated information collection.

[0049] The electrode slitting system and method proposed in this application can implement a closed-loop automatic electrode deviation correction system to improve the consistency of battery cell capacity. This reduces batch electrode scrapping, saves material costs, and thus improves electrode yield and production efficiency. It also monitors appearance defects in real time, reducing the outflow of defective electrodes. Furthermore, it can initiate early warning shutdowns for defects, making it easier for operators to troubleshoot and locate faults. This reduces human contact with production equipment and improves production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive work. In the drawings:

[0051] FIG1 shows a schematic diagram of a pole piece cutting system according to an embodiment of the present application;

[0052] FIG2 shows a schematic diagram of a pole piece cutting system according to another embodiment of the present application;

[0053] FIG3 shows a schematic diagram of a pole piece cutting system according to another embodiment of the present application;

[0054] FIG4 shows a schematic diagram of an information collection module according to an embodiment of the present application;

[0055] FIG5 shows a schematic diagram of an information collection module according to an embodiment of the present application;

[0056] FIG6A shows a schematic diagram of a second pole piece according to an embodiment of the present application;

[0057] FIG6B shows a schematic diagram of another second pole piece according to an embodiment of the present application;

[0058] FIG7 shows a schematic diagram of a pole piece cutting system according to another embodiment of the present application.

[0059] FIG8 shows a flow chart of a pole piece cutting method according to an embodiment of the present application;

[0060] FIG9 shows a flow chart of an information collection method for a pole piece cutting method according to an embodiment of the present application;

[0061] FIG10 shows a flow chart of a defect detection method for a pole piece slitting method according to an embodiment of the present application.

[0062] Explanation of the accompanying drawings: 1000-pole piece slitting system, 110-first pole piece, 120-second pole piece, 200-pole piece cutting device, 300-information acquisition module, 700-processor, 310-second information acquisition submodule, 320-first information acquisition submodule, 330-third information acquisition submodule, 410-first roller, 420-second roller, 430-third roller, 400-correction module, 600-marking mechanism, 800-alarm, 301-image acquisition module, 302-light source. DETAILED DESCRIPTION

[0063] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise specified, “multiple” means more than two; in addition, the terms “first”, “second”, “third”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0065] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0066] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0067] The term "plurality" used in this application refers to two or more (including two).

[0068] The term "and / or" in this application simply describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0069] During the production of battery cell electrodes, current slitting equipment cannot inspect the electrodes in real time, and deviations can easily lead to batch scrapping. Operators only periodically inspect the electrodes and visually inspect their appearance during production. When dimensional deviations are detected, manual corrections are performed, which cannot be adjusted in real time, often resulting in batch scrapping and impacting production efficiency.

[0070] The electrode slitting system and method proposed in this application collects electrode information in real time and corrects the electrode deviation, achieving a closed-loop automatic electrode deviation correction. This reduces batch scrapping of electrodes, improves electrode yield and production efficiency. Automatic detection in the slitting system replaces manual inspection, reducing labor costs, improving product stability, and ensuring personnel safety.

[0071] In the present application, the battery may include a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiments of the present application are not limited to this. The core component of the battery that can realize the repeated charge and discharge function is the electrode assembly in the battery cell. The electrode assembly includes a pole piece and a diaphragm. The pole piece includes a positive pole piece and a negative pole piece. The diaphragm is usually arranged between the positive pole piece and the negative pole piece to insulate the positive pole piece and the negative pole piece from each other. The material of the diaphragm can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. The battery cell mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work.

[0072] The electrode sheet includes a current collector and an active material layer. The current collector includes a coated area coated with an active material layer and a hollow foil area not coated with an active material layer along the width direction of the electrode sheet. Tabs are cut out of the current collector in the hollow foil area. Tabs are metal conductors that lead the positive and negative electrodes out of the battery cell and serve as contact points during charging and discharging of the battery. In production practice, the hollow foil area is also called the "tab area." The positive electrode current collector can be aluminum foil, and the positive electrode active material layer includes a ternary material, lithium manganese oxide, or lithium iron phosphate. The negative electrode current collector can be copper foil, and the negative electrode active material layer includes graphite or silicon.

[0073] Slitting refers to the process of cutting a single electrode sheet into multiple strips along the width direction according to the battery design structure and specifications. Generally, for wound batteries, the electrode sheet is slit into multiple strips according to the designed width; for laminated batteries, the electrode sheet material must be slit into strips before being cut into sheets, and then cut to the required size.

[0074] The electrode slitting system and method of the present invention can be performed before or after the die-cutting process. Die-cutting involves cutting the electrode tabs from the bare foil area of ​​the electrode tab according to the tab design specifications. Because the electrode tabs have a long tape path between the slitting and die-cutting processes, to improve the quality of the electrode slitting, the electrode tabs need to be corrected before slitting to correct their tape path.

[0075] As shown in FIG1 , an embodiment of the present application provides a pole piece cutting system 1000, comprising: a pole piece cutting device 200, an information acquisition module 300, and a processor 700. The pole piece cutting device 200 is used to cut a first pole piece 110 into a plurality of second pole pieces 120, wherein the width of the first pole piece 110 is greater than the width of the second pole piece 120. The information acquisition module 300 is used to collect information about the second pole piece 120. The processor 700 is used to obtain information about the second pole piece 120 and determine whether the plurality of second pole pieces 120 are offset based on the information. If an offset occurs, the processor 700 corrects the first pole piece 110.

[0076] Among them, the pole piece cutting device 200 can be any mechanism that can realize the pole piece cutting function. As shown in Figure 2, the pole piece cutting device 200 is used to cut the first pole piece 110 into multiple second pole pieces 120. In some embodiments, the pole piece cutting device 200 may include multiple cutting pieces, and different cutting pieces are used to cut different areas of the pole piece. For example, multiple cutting pieces act on the centers of multiple empty foil areas or coated areas of the first pole piece 110 to be cut, respectively, to divide the first pole piece 110 into multiple second pole pieces 120 with the same width. At present, the battery pole piece cutting process mainly adopts the following three methods: (1) disc shear cutting; (2) mold punching; (3) laser cutting. The edge quality and size data of the pole piece cutting will directly affect the performance and safety of the finished battery. Among them, laser cutting has the characteristics of high production efficiency and good process stability compared with disc shear cutting and mold punching, and has been used in industry for cutting battery pole pieces. Accordingly, the cutting piece may include but is not limited to a cutter, a cutting head, a laser beam, etc. The cutting piece is used to perform the above-mentioned slitting operation to complete the stripping of the electrode. In the embodiment of the present application, for the convenience of distinction, the electrode before slitting is referred to as the first electrode 110, and the electrode after slitting is referred to as the second electrode 120.

[0077] The information acquisition module 300 is always in the state of collecting information and can send the collected information to the processor 700 for processing in real time. The information acquisition module 300 includes at least one information acquisition submodule for collecting information of multiple second pole pieces 120. The information acquisition module 300 can collect various characteristic information such as shape, size, position, brightness, color, texture, etc. of the second pole piece 120 in the cutting system 1000. The information acquisition module 300 collects information in the following four ways: (1) Infrared / thermal infrared sensing: using infrared sensors or thermal infrared cameras to capture infrared or thermal infrared images that cannot be seen by the human eye. (2) Camera capture: using a digital camera or video camera to capture images by scanning line by line or frame by frame. (3) Video acquisition: using a camera or video camera to collect a continuous video stream, the information of the pole piece can be obtained by extracting image frames from the continuous video. (4) 3D scanning: obtaining the three-dimensional shape and texture information of the object by using technologies such as structured light, time of flight (TOF) or stereo cameras.

[0078] Among them, structured light is a system structure composed of a projector and a camera. After using a projector to project specific light information onto the surface of an object and the background, the camera collects the information. Based on the changes in the light signal caused by the object, this solution can calculate information such as the object's position and depth, and then restore the entire three-dimensional space. TOF technology is a technology that measures the time it takes for an object, particle, or wave to fly a certain distance in a fixed medium (the medium / distance / time are all known or measurable) to further understand certain properties of the particle or medium. A stereo camera refers to a camera that can synchronously photograph and obtain stereo pairs of images. Accordingly, in some embodiments, the information acquisition submodule can be a (thermal) infrared sensor device, a dedicated industrial camera, a digital X-ray imaging device, a video acquisition device, a 3D scanning device, or an ordinary digital camera, a video camera, a mobile phone camera, etc. In the embodiments of the present application, collecting information about the second pole piece 120 means obtaining information about the second pole piece 120 through the information acquisition module 300. This information includes all the information required for determining the offset of the second pole piece 120, including information such as the shape, size, and position of the second pole piece 120.

[0079] In an embodiment of the present application, the processor 700 may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), which is used to perform multiple different signal processing processes. The processor 700 obtains the electrode information collected by the information acquisition module 300 in real time, including relevant information that can be used to determine the offset of the electrode. After performing different signal processing, the processor 700 outputs the offset judgment result. The processor 700 also outputs a correction instruction to correct the offset of the electrode.

[0080] Among them, the pole piece offset refers to the offset of the pole piece width after slitting compared with the standard width, which exceeds the lower limit of the error threshold but does not exceed the upper limit of the error threshold. At this time, the pole piece can be corrected to improve the width of the pole piece after slitting. The processor 700 is also called the "industrial computer" and is used to display the production status of the equipment and control the equipment to perform corresponding operations. It generally includes a host computer and a slave computer. Conceptually, the controller and the service provider are the host computer, and the controlled party and the serviced party are the slave computer. It can also be understood as the relationship between the host and the slave computer. The master-slave relationship between the host computer and the slave computer can be converted.

[0081] In the embodiment of the present application, after the host computer obtains the information of the electrode, it performs calculations and processes it, and then issues a corresponding command to the slave computer first. The slave computer then interprets this command into a corresponding timing signal to control the relevant equipment components and drive devices. The slave computer reads the equipment status data (generally analog), converts it into a digital signal and feeds it back to the host computer. Regarding the host computer and the slave computer, the host computer (Host Computer / Master Computer / Upper Computer) refers to a computer that can directly issue control commands, generally a human-machine interface device (Human Machine Interface) such as a workstation or a touch screen, including hardware and software.

[0082] In an embodiment of the present application, the screen of the upper computer will display various information of the obtained electrode, and will also display the processing results of the electrode information, including the offset results. The lower computer is a computer that directly controls the equipment and obtains the equipment status, generally a microcomputer such as a PLC (Programmable Logic Controller) or a single chip microcomputer (Single Chip Microcomputer / Slave Computer / Lower Computer). Among them, PLC is a digital operation controller with a microprocessor for automatic control, which can load control instructions into memory at any time for storage and execution. PLC is composed of functional units such as CPU, instruction and data memory, input / output interface (I / O interface), power supply, analog-to-digital (A / D) conversion, including various functions such as logic control, timing control, analog control, and multi-machine communication. A single-chip microcomputer (MCU) is an integrated circuit chip that uses very large-scale integrated circuit technology to integrate a CPU with data processing capabilities, random access memory (RAM), read-only memory (ROM), multiple I / O interfaces and interrupt systems, timers / counters and other functions (may also include display driver circuits, pulse width modulation circuits, analog multiplexing, A / D conversion and other circuits) into a silicon chip to form a small and complete microcomputer system.

[0083] In the embodiments of the present application, offset refers to the situation where a spatial offset occurs. The offset of the second pole piece 120 refers to the situation where the second pole piece 120 is cut off, that is, the area cut along its width direction is misaligned, and the precision requirement of cutting cannot be met. If cutting continues on the basis of the offset, the second pole piece 120 will be scrapped in batches. Not only does it affect the yield rate of the cutting process, but the second pole piece 120 with unqualified dimensional accuracy flows into the subsequent winding or lamination process. If the negative electrode cannot completely wrap the positive electrode, it will further affect the performance of the battery, such as the state of charge (SOC) of the battery cell. In some embodiments, the offset of the second pole piece 120 can be understood as the position of the first pole piece 110 being offset relative to the position of the cutter, and the cutter does not cut from the central axis of the cutting area, resulting in the cut pole piece being wide on one side and narrow on the other.

[0084] In the case where it is determined that an offset has occurred, the processor 700 corrects the first pole piece 110. In an embodiment of the present application, in the case where it is determined that an offset has occurred and the offset amount is less than or equal to the upper threshold value of the offset error, the processor 700 calculates the offset error as a correction value, and corrects the first pole piece 110 according to the correction value. Correction generally refers to a technical operation taken to always keep the sides of the coil neat and consistent during the coil winding process. In an embodiment of the present application, correction refers to an operation in which, after an offset occurs, the position of the first pole piece 110 is adjusted so that the widths of the various areas cut along the width direction can remain consistent during slitting. In some embodiments, adjusting the position of the first pole piece 110 includes adjusting its angle, position in the width direction, etc. in the slitting system 1000, and moving the first pole piece 110 so that the cutter position is aligned with the central axis of the cutting position.

[0085] In some embodiments, as shown in Figure 3, the slitting system 1000 also includes a correction module 400, which is used to adjust the position of the pole piece according to the control of the processor 700. Accordingly, the processor 700 corrects the first pole piece 110 by controlling the correction module 400 to correct the first pole piece 110. The correction module 400 is used to correct the first pole piece 110 according to the control command of the processor 700. The correction module 400 generally includes a correction mechanism and a motor. The correction mechanism has different specifications according to different strokes and thrusts, and is used to receive the correction instructions of the processor 700, and control the motor to drive the correction mechanism to perform correction operations.

[0086] In some embodiments, the correction mechanism may include a support frame, a first correction roller and a second correction roller to perform correction so as to keep the shape of the second electrode 120 after slitting relatively consistent. The shape and manufacturing material of the support frame are not limited. The first correction roller and the second correction roller can be rotatably arranged on the support frame. The first correction roller and the second correction roller are arranged opposite to each other, and the electrode passes through the roller gap between the first correction roller and the second correction roller. The first correction roller and the second correction roller cooperate to clamp the electrode and adjust the position of the electrode in the axial direction of the first correction roller to achieve correction. The first electrode 110 after correction is then sent to the electrode cutting device 200 for slitting. The first deflection correcting roller and the second deflection correcting roller are arranged in the conveying direction of the first pole piece 110. The first pole piece 110 includes a first surface and a second surface that are opposite to each other. The first deflection correcting roller and the second deflection correcting roller are arranged on both sides of the first pole piece 110, that is, the first deflection correcting roller is in contact with the first surface, and the second deflection correcting roller is in contact with the second surface. The first deflection correcting roller and the second deflection correcting roller are clamped on the first surface and the second surface of the pole piece, and the position of the first pole piece 110 in the axial direction of the first deflection correcting roller is adjusted to calibrate the position of the first pole piece 110 when it is cut.

[0087] The electrode slitting system 1000 proposed in this embodiment of the application can detect electrode information in real time during the battery cell electrode slitting process. Compared to manual inspection followed by manual correction, this reduces batch scrapping of electrodes and improves the electrode slitting yield rate. It also reduces production costs such as labor and materials, while minimizing contact between personnel and equipment, thereby ensuring personnel safety.

[0088] In some implementations, as shown in FIG. 4 , the information acquisition module 300 includes an image acquisition module 301 .

[0089] In some implementations, the image acquisition module 301 is a charge coupled device camera.

[0090] The image acquisition module 301 refers to any of the above-mentioned devices that acquire information in the form of images, such as professional industrial cameras, digital cameras, video cameras, mobile phone cameras, etc. In some embodiments, a charge-coupled device camera, i.e., a CCD (Charge-Coupled Device) camera, can convert light into electric charges and store and transfer the charges. The CCD camera can also extract the stored charges to change the voltage. CCD cameras have the characteristics of high color reproduction accuracy, small size, light weight, no influence of magnetic fields, and resistance to vibration and impact, and are widely used in industry. The CCD camera converts the pixel value of the light signal into an electrical signal by scanning the pixel value of each pixel point of the electrode, and converts the electrical signal into a digital signal through analog-to-digital conversion.

[0091] The image acquisition module 301 offers both cost and performance advantages compared to other information acquisition systems. Furthermore, image acquisition technology is highly mature and readily applicable to industry. Furthermore, the CCD camera offers advantages over other image acquisition devices, such as high image quality, low noise, high sensitivity, and fast readout times, resulting in high detection efficiency and accuracy.

[0092] In some embodiments, as shown in FIG4 , the information acquisition module 300 typically further includes a light source 302 for providing supplemental illumination to the image acquisition module 301. By adjusting the position and angle of the image acquisition module 301 and the light source 302 relative to the pole piece, and adjusting the brightness of the light source, multiple frames of images to be inspected at different locations, orientations, and exposure rates can be obtained for subsequent inspection.

[0093] In some embodiments, as shown in Figure 5, a straight line AB passes through the center point B of the first roller 410 and the contact point A between the second pole piece 121 and the first roller 410, and is the center line between the straight line AC from the image acquisition module 301 to the contact point A and the straight line AE from the light source 302 to the contact point A. In other words, the angle between the straight line AB and the straight line AB from the image acquisition module 301 to the contact point A is equal to the angle between the straight line AB and the straight line AE from the light source 302 to the contact point A, i.e., ∠α. In some embodiments, ∠α can be 30°, and the distance DD from the image acquisition module 301 to the contact point can be 590 mm (millimeter), referred to as the light source distance.

[0094] Image acquisition module 301 captures information, enabling detection not only of electrode offset but also of surface defects. This eliminates the need for separate measurement or image acquisition devices, saving both cost and system space. The easily adjustable light source 302 not only sharpens captured images but also allows for the acquisition of multiple frames of image information under varying lighting conditions, thereby improving detection accuracy.

[0095] During the manufacturing process, electrode sheets are typically stored and transported in rolls for coating, cold pressing, slitting, and die-cutting. To improve production efficiency, electrode sheet rolls typically include multiple active material coating areas and bare foil areas, arranged in a repeating pattern perpendicular to the electrode sheet's conveying direction, i.e., along the width of the electrode sheet. As mentioned above, the coated areas are the areas on the current collector where the active material layer is applied. The bare foil areas are the areas on the current collector where the active material layer is not applied.

[0096] In some embodiments, depending on the cutting position, the electrode can be cut from the center line of the empty foil area or the coated area. Figure 6A is a schematic diagram of obtaining multiple second electrode pieces 120 by cutting from the empty foil area. Figure 6B is a schematic diagram of obtaining multiple second electrode pieces 120 by cutting from the coated area. As shown in Figure 6A, the second electrode 120 may include a coated area and empty foil areas on both sides of the coated area along the width direction; or as shown in Figure 6B, it may include an empty foil area and coated areas on both sides of the empty foil area. The electrode cutting device 200 cuts the first electrode 110 from the center line of multiple empty foil areas (Figure 6A) or coated areas (Figure 6B) repeatedly arranged along the width direction to obtain multiple second electrode pieces 120-1, 120-2, 120-3, 120-4 of required specifications. The multiple second electrode pieces 120 are numbered sequentially. After being numbered sequentially, the multiple second electrode pieces 120 are divided into two paths, odd-numbered and even-numbered, and transmitted separately.

[0097] In some embodiments, the slitting system 1000 further includes multiple rollers. These rollers serve as transmission components of the slitting system 1000 and are positioned at different locations along the conveying direction. A transmission component is a component or mechanism that transfers power from one part of a machine to another, causing the machine or its components to move or operate. Due to friction between the rollers and the second pole piece 120, the self-rotation of the rollers can drive the second pole piece 120 to rotate, causing the second pole piece 120 to continuously move forward along the conveying direction.

[0098] In some embodiments, as shown in Figures 2 and 3, the slitting system 1000 includes two rollers, namely a first roller 410 and a second roller 420. Among them, the first roller 410 is used to convey a plurality of odd-numbered second pole pieces after slitting, such as 120-1, 120-3, etc., and the second roller 420 is used to convey a plurality of even-numbered second pole pieces 120-2, 120-4, etc. after slitting. In other embodiments, the number of rollers is the same as the number of second pole pieces 120 after slitting, and each roller only conveys one second pole piece 120 for conveyance. Conveying the plurality of second pole pieces 120 after slitting in two directions saves more system space and is more convenient for structural design compared to the design of using different rollers to convey each second pole piece 120 in different directions. Using different rollers to convey each second pole piece 120 in different directions has the advantages of more accurate conveyance, etc.

[0099] In some embodiments, as shown in Figures 2 and 3, the information collection module 300 includes a first information collection submodule 310 for collecting information from odd-numbered second pole pieces 120-1 at the first roller 410. In other embodiments, the information collection module 300 also includes a second information collection submodule 320 for collecting information from even-numbered second pole pieces 120-2 at the second roller 420. The first information collection submodule 310 and the second information collection submodule 320 generally include the same information collection device.

[0100] In some embodiments, the first information acquisition submodule 310 and the second information acquisition submodule 320 may be industrial cameras for collecting information from the second electrode 120. Industrial cameras have high frame rates, comprehensive information acquisition, and high-quality imaging. They are suitable for high-quality image processing algorithms and offer stable performance. They are easy to install, compact, and durable, making them durable and durable, and can operate continuously in harsh environments.

[0101] In some embodiments, each second electrode piece 120 corresponds to an information collection submodule, so that the information of all the cut second electrode pieces 120 is completely collected.

[0102] The information collection module 300 collects information about the pole piece at the roller shaft rather than at other locations in the direction of pole piece transmission because the motion state of the pole piece at the roller shaft is more stable, which can improve the quality of information collection.

[0103] In some embodiments, the information of the second pole piece 120 includes the width of the second pole piece 120 . Accordingly, the processor 700 determines the offset including determining whether a width offset occurs, wherein the direction of the width is perpendicular to the transmission direction of the second pole piece 120 .

[0104] In some embodiments, the processor 700 determines whether width offset has occurred by comparing the width of the second electrode piece 120 after slitting with the standard width, including: determining the standard width of the second electrode piece 120, including the standard width of the bare foil area and the standard width of the coated area. Calculating the offset of the width of each second electrode piece 120 relative to the standard width. If the width offset is less than or equal to the lower threshold of the width offset error, it is determined that width offset has not occurred. If the width offset is greater than the lower threshold of the width offset error, it is determined that width offset has occurred. For the two second electrode piece 120 configurations shown in Figures 6A and 6B, the standard width refers to the width of the bare foil area or coated area at any edge of the electrode piece, selected based on the electrode piece material, as the standard width of the electrode piece. For the second electrode piece 120 shown in Figure 6A, the cutting position is the centerline of each bare foil area, and the standard width is the standard bare foil area width. Correspondingly, for the second electrode piece 120 shown in Figure 6B, the standard width is the standard coated area width. In some embodiments, when the cutting position is the bare foil area, the lower threshold of the width offset error of the bare foil area is 1 mm, and the upper threshold is 2 mm. In some embodiments, when the slitting position is the coating area, the lower limit threshold of the coating area width offset error is 0.5 mm, and the upper limit threshold is 1 mm.

[0105] Compared with the information of angle offset, width offset is easier to obtain and process. By judging the width offset, whether correction is needed is determined. It has low complexity and is easy to implement.

[0106] In some embodiments, the slitting system 1000 further includes: when the processor 700 determines that an offset has occurred, it also includes: if the width offset is greater than the upper limit threshold of the width offset error, the processor 700 notifies the alarm 800 to alarm. In the case where the width offset exceeds the upper limit threshold of the width offset error, the partially cut second pole piece 120 is a defective product and requires personnel to check and process it. The alarm instructs the operator to stop the machine to process the defective products, and then the slitting system 1000 continues to work. The processor 700 notifies the alarm 800 to alarm by outputting an alarm instruction. In some embodiments, the alarm 800 may include an alarm indicator light and / or a buzzer. When the alarm 800 alarms, the alarm indicator light flashes and / or the buzzer sounds. The alarm can promptly remind the operator to discover and deal with the width offset problem of the pole piece, reduce the defective rate of the pole piece, and improve production efficiency.

[0107] In addition, in some embodiments, before determining whether an offset occurs, the processor 700 further includes determining whether a coating area is misaligned. The processor 700 determines whether the coating area is misaligned by comparing the coating positions of the first and second surfaces of the first electrode 110. The distance error from the edge of the coating area of ​​the first surface relative to the edge of the electrode on the second surface is used as the position offset error. If the position offset error is greater than the misalignment threshold, the width offset judgment is no longer performed. The processor 700 notifies the alarm 800 to shut down the alarm and process the portion of the electrode. If the coating area position offset error is less than the misalignment threshold, the processor 700 continues to determine the width offset. In some embodiments, for multiple second electrode pieces 120 similar to those shown in FIG6B , the processor 700 further includes determining whether the coating area of ​​each second electrode piece 120 after cutting is misaligned. The processor 700 determines whether the coating area of ​​the second electrode piece 120 is misaligned, and can refer to the determination of the misalignment of the coating area of ​​the first electrode piece 110. In some embodiments, the misalignment error threshold can be 0.5 mm. Before determining whether a width offset occurs, it is determined whether a coating area is misaligned, so that defective electrodes can be checked and processed in a timely manner, thereby reducing resource waste of the slitting system 1000.

[0108] As shown in Figures 2 and 3, in some embodiments, the slitting system 1000 also includes a third roller 430 for conveying the first pole piece 110. Accordingly, the information acquisition module 300 also includes a third information acquisition submodule 330 for collecting information of the first pole piece 110 at the third roller 430.

[0109] The third roller 430 is one of the transmission components of the slitting system 1000 and is consistent with the first roller 410 and the second roller 420. The third information collection submodule 330 is also consistent with the other information collection submodules to facilitate processing and manufacturing.

[0110] The purpose of collecting the information of the first electrode 110 is to detect the appearance defects of the electrode before correction, to deal with the defective electrode in time, and to improve the yield rate.

[0111] The electrode piece includes a first side and a second side, i.e., both sides, each capable of detecting deviations and defects. In some embodiments, the third information acquisition submodule 330 can collect information about the first side of the first electrode piece 110. The first information acquisition submodule 310 and the second information acquisition submodule 320 can respectively collect information about the second side of the second electrode piece 120. This allows for comprehensive collection of information on both sides of the electrode piece, while also conserving system space and reducing the number of information acquisition modules 300.

[0112] In some embodiments, two information acquisition submodules may be used to respectively obtain information of the first surface and the second surface of the first electrode piece 110 , so that appearance defects of the electrode piece can be completely detected before slitting.

[0113] In some embodiments, more information collection submodules may be used to separately obtain information about the first and second surfaces of each second pole piece 120 , and the appearance defects and offsets of the pole pieces may also be completely detected.

[0114] In some embodiments, the information about the first electrode piece 110 and / or the second electrode piece 120 also includes appearance information. Based on the appearance information, the processor 700 is further configured to determine whether the first electrode piece 110 and / or the plurality of second electrode pieces 120 have any appearance defects; if so, the alarm 800 is notified to generate an alarm.

[0115] Appearance information refers to the shape, brightness, and other information of the electrode, corresponding to different appearance defects. Appearance defects include wrinkles, bumps, cracks, bubbles, decarburization, coating omissions, metal leakage, and dark marks on the electrode surface. In some embodiments, shape information corresponds to defects such as wrinkles, bumps, cracks, bubbles, decarburization, and coating omissions, while brightness information corresponds to defects such as metal leakage and dark marks.

[0116] In some embodiments, the processor 700 can determine these appearance defects through an image processing algorithm. In some embodiments, the image processing algorithm can use deep learning technology. Through several image acquisition modules 301 and light sources 302 in different orientations, multiple frames of images to be detected are obtained at different locations, orientations, and exposure rates. The multiple frames of images to be detected are then screened based on the image template of the product to be detected to obtain a target image to be detected containing the product to be detected. When defect detection begins, the processor 700 receives multiple frames of images to be detected of the electrode to be detected uploaded by the image collection module 301. The target image to be detected is input into a pre-trained defect detection model, wherein the pre-trained defect detection model is trained with a large amount of sample image data of various morphological defects, and the defect detection model outputs a detection result, wherein the detection result includes defect data, such as defect type data, defect size data, and defect location data. The texture, color, shape, and other features of the electrode surface are usually relatively complex, and the defect forms that appear are also diverse. Deep learning technology can learn the abstract features of defects based on the defective sample data of the electrode, thereby accurately detecting the parts of the electrode that are similar in morphology to the defective samples, thereby improving the accuracy and precision of defect detection.

[0117] In some embodiments, after determining that an appearance defect occurs, the processor 700 outputs an appearance defect alarm instruction and notifies the alarm device 800 to sound an alarm.

[0118] In some embodiments, as shown in FIG3 , the slitting system 1000 further includes a marking mechanism 600 for printing and attaching defect labels to the appearance defects of the first pole piece 110 and / or the second pole piece 120. After the processor 700 determines that the first pole piece 110 and / or the second pole piece 120 has an appearance defect, it outputs a labeling signal corresponding to the defect and controls the marking mechanism 600 to attach the corresponding defect label to the defect location of the first pole piece 110 and / or the second pole piece 120.

[0119] In some cases, multiple measuring devices are set up to measure and correct the offset of the electrode piece that is divided into two, without considering the detection of appearance defects, and automatic correction and appearance defect detection cannot be achieved at the same time. The separate detection of offset and defects makes the system integration low, and the detection method is single, which is not suitable for the offset and defect detection of the electrode piece that is divided into multiple pieces. Some embodiments of the present application detect appearance defects in the process of correcting the offset, thereby improving the utilization rate of the information acquisition module 300. Real-time detection of appearance defects eliminates the need for manual regular spot checks, reduces the flow of defective products into subsequent processes, and is beneficial to ensuring battery performance. Timely alarms when defects occur make it easier for engineers to troubleshoot and locate the problem.

[0120] As shown in FIG7 , the present application provides another slitting system 1000 . Compared to the slitting system 1000 shown in FIG2 , the transmission assembly in this embodiment includes more rollers for conveying the electrode coil. For the sake of brevity, the parts that are the same as the previous embodiment are not repeated here.

[0121] Multiple rollers are arranged at different positions along the conveying direction of the slitting system 1000. Multiple rollers are arranged where the electrode sheet roll enters the slitting system. After unwinding, the electrode sheet is conveyed through the slitting system in the form of the first electrode sheet 110. Multiple rollers are arranged along the conveying path of the second electrode sheet 120, forming an irregular conveying path. A roller is arranged at the end of the conveying path of the second electrode sheet 120 to rewind the multiple second electrode sheets 120 obtained by slitting.

[0122] The electrode slitting system 1000 proposed in this embodiment can not only detect offset and appearance defects in real time, but also realize the unwinding and rewinding of electrode material rolls, and improve the stability of electrode transmission on the roller and space utilization.

[0123] As shown in FIG8 , the embodiment of the present application further provides a pole piece cutting method, comprising:

[0124] S100: cutting the first pole piece into a plurality of second pole pieces, wherein the width of the first pole piece is greater than the width of the second pole piece; S200: collecting information of the second pole piece; and S300: obtaining the information and executing S400: judging whether the second pole piece is offset according to the information, and S500: correcting the first pole piece in case of offset.

[0125] Judgment is a process of thinking that affirms or denies a situation. Determining whether the electrode is offset after slitting, or whether it is offset during slitting, can result in either offset or no offset.

[0126] The electrode slitting method proposed in the embodiments of this application detects electrode offset in real time during the battery cell electrode slitting process. Compared to manual correction after spot checks, this method reduces batch scrapping of electrodes and improves the yield rate of electrode slitting. It also reduces production costs such as labor and materials, while minimizing contact between personnel and machinery, ensuring personnel safety.

[0127] As shown in FIG9 , in some embodiments, the pole piece slitting method includes: using two rollers, a first roller 410 and a second roller 420 , to perform S210 : respectively conveying the odd-numbered second pole pieces and the even-numbered second pole pieces after slitting.

[0128] Transmitting the cut second pole pieces 120 - 1 and 120 - 2 in two directions saves more system space and is easier to design in terms of structure, compared to a method in which each second pole piece 120 is transmitted in a different direction.

[0129] As shown in FIG9 , in some embodiments, S200 collecting information about the second electrode piece includes:

[0130] S220: Collect information about the odd-numbered second pole pieces at the first roller, and information about the even-numbered second pole pieces at the second roller.

[0131] The information acquisition module 300 collects information about the second pole piece 120. The first information acquisition submodule 310 collects information about the second pole piece 120-1, while the second information acquisition submodule 320 collects information about the second pole piece 120-2. Because the pole piece's motion is relatively stable at the roller axis, collecting information at the roller axis improves the quality of information acquisition.

[0132] In some embodiments, the information about the second pole piece 120 includes the width of the second pole piece 120 . Accordingly, the offset includes a width offset, where the width is perpendicular to the conveying direction of the second pole piece 120 . According to the aforementioned method, by comparing the width of the second pole piece 120 with a standard width, it is determined whether the second pole piece 120 has a width offset. Compared to information about the angular offset, the width offset is easier to obtain and process. Determining whether correction is required by determining the width offset is less complex and easier to implement.

[0133] As shown in FIG9 , in some embodiments, the electrode slitting method further includes S230: collecting information about the first electrode piece at the third roller. The third information collection submodule 330 collects information about the first electrode piece 110. This information collection is used to detect surface defects in the electrode piece before correcting the deviation. This facilitates timely processing of defective electrode pieces and improves production yield.

[0134] As shown in Figure 10, in some embodiments, the pole piece cutting method also includes: the information of the first pole piece 110 and / or the second pole piece 120 also includes appearance information, and S600 is executed according to the appearance information: determining whether the first pole piece and / or the second pole piece has appearance defects; and S700: if appearance defects occur, an alarm is issued.

[0135] Detecting appearance defects during the deviation correction process facilitates effective correction. Real-time detection of appearance defects eliminates the need for manual, scheduled spot checks, reduces the flow of defective products into subsequent processes, and helps ensure battery performance.

[0136] In some embodiments, the appearance information includes appearance information of the first and second surfaces of the first and second pole pieces 110 and 120. In some embodiments, the appearance information includes appearance information of the first surface of the first pole piece 110 and appearance information of the second surface of the second pole piece 120.

[0137] In this way, the information of the first and second surfaces of the electrode piece can be completely collected, without having to collect information of both surfaces of the first electrode piece 110 and each second electrode piece 120, thereby reducing the waste of resources caused by repeated information collection.

Claims

1. A pole piece cutting system (1000), wherein: include: A pole piece cutting device (200) for cutting a first pole piece (110) into a plurality of second pole pieces (120), wherein the width of the first pole piece (110) is greater than the width of the second pole piece (120); An information collection module (300) for collecting information of the second pole piece (120); and The processor (700) is used to obtain the information and determine whether the second pole piece (120) is offset based on the information. If an offset occurs, the processor (700) corrects the first pole piece (110).

2. The system (1000) according to claim 1, wherein: The information acquisition module (300) comprises an image acquisition module (301).

3. The system (1000) according to claim 2, wherein: The image acquisition module (301) is a charge coupled device camera.

4. The system (1000) according to any one of claims 1 to 3, wherein: The system (1000) further comprises a first roller (410) and a second roller (420), wherein the first roller (410) and the second roller (420) are respectively used to convey the odd-numbered second pole pieces (120-1) and the even-numbered second pole pieces (120-2) after slitting.

5. The system (1000) according to claim 4, wherein: The information collection module (300) comprises a first information collection submodule (310) for collecting information of odd-numbered second pole pieces (120-1) at the first roller (410).

6. The system (1000) according to claim 5, wherein: The first information collection submodule (310) is used to collect information about the second surface of the odd-numbered second pole pieces (120-1).

7. The system (1000) according to any one of claims 4 to 6, wherein: The information collection module (300) further comprises a second information collection submodule (320) for collecting information of even-numbered second pole pieces (120-2) at the second roller (420).

8. The system (1000) according to claim 7, wherein: The second information collection submodule (320) is used to collect information about the second surface of the even-numbered second pole pieces (120-2).

9. The system (1000) according to any one of claims 1 to 8, wherein: The information of the second pole piece (120) includes the width of the second pole piece (120), and accordingly, the offset includes a width offset, and the direction of the width is a direction perpendicular to the transmission direction of the second pole piece (120).

10. The system (1000) according to any one of claims 1 to 9, wherein: The system (1000) further comprises a third roller (130) for transmitting the first pole piece (110); correspondingly, the information acquisition module (300) further comprises a third information acquisition submodule (330) for acquiring information of the first pole piece (110) at the third roller (130).

11. The system (1000) of claim 10, wherein: The third information collection submodule (330) is used to collect information about the first surface of the first pole piece (110).

12. The system (1000) according to any one of claims 1 to 11, wherein: The information of the first pole piece (110) and / or the second pole piece (120) also includes appearance information. The processor (700) is also used to determine whether the first pole piece (110) and / or the second pole piece (120) has appearance defects based on the appearance information, and if the appearance defects occur, notify the alarm (800) to sound an alarm.

13. A method for cutting a pole piece, wherein: The method comprises: Cutting the first pole piece into a plurality of second pole pieces, wherein the width of the first pole piece is greater than the width of the second pole piece; collecting information of the second pole piece; and The information is obtained, and it is determined whether the second pole piece is offset according to the information, and if an offset occurs, the first pole piece is corrected.

14. The electrode slitting method according to claim 13 of the group, wherein: Before the first pole piece is cut into a plurality of second pole pieces, the method further comprises: Collecting information of the first pole piece; When it is determined according to the information of the first pole piece that no appearance defect occurs, performing the step of cutting the first pole piece into a plurality of second pole pieces; When it is determined based on the information of the first electrode piece that an appearance defect occurs, an alarm is notified to sound an alarm.

15. The pole piece cutting method according to claim 13 or 14, wherein: The obtaining of the information and judging whether the second pole piece is offset according to the information includes: obtaining said information; In the case where it is determined according to the information that the second pole piece has no appearance defect, performing the step of determining according to the information whether the second pole piece is offset; When it is determined according to the information that the second pole piece has an appearance defect, an alarm is notified to sound an alarm.

16. The pole piece cutting method according to any one of claims 13 to 15, wherein: The information of the second pole piece includes a width of the second pole piece, and determining whether the second pole piece is offset includes: Calculating the deviation of the width of the second pole piece compared to the standard width; If the width offset is greater than the width offset error lower limit threshold, it is determined that the second pole piece has a width offset.

17. The pole piece cutting method according to claim 16, wherein: Correcting the deviation of the first pole piece includes: If the width offset is less than the width offset error upper limit threshold, calculate the correction value; The first pole piece is corrected according to the correction value.

Images