Electrode sheet slitting system and method

Abstract

The present application provides an electrode sheet slitting system and method applicable to the electrode sheet slitting process in a battery production process. The present application implements an automatic electrode sheet correction closed-loop and appearance defect alarm notification by collecting information on the electrode sheet in real time and detecting offset and appearance defects of the electrode sheet. Real-time automatic correction reduces the placement defect rate of the electrode sheet. By immediately notifying an alarm when a defect is detected, the number of defective electrode sheets introduced into subsequent production procedures is reduced.

Description

Technology Field

[0001] Cross-reference

[0002] This application claims priority to Chinese Patent Application No. 202311650176.7, filed on December 4, 2023, titled “Electrode Sheet Slitting System and Method,” which is incorporated by reference in its entirety into this application.

[0003] The present application relates to the field of battery production technology, specifically to a slitting system and method in the process of producing battery electrode sheets. Background Technology

[0004] The manufacturing process of an electrode sheet for a battery cell includes pretreatment processes such as slurry stirring, coating, cold pressing, pre-slitting, and die cutting. Here, the coating process involves uniformly coating the slurry onto the surface of a current collector and drying it to form electrode sheet strips for the positive and negative electrodes, and then winding them up. After coating, the process enters a cold pressing step, and the electrode sheet strips are rolled through rollers to compress the porous coating layer and firmly adhere it to the foil material, thereby obtaining electrode sheet strips that meet specification requirements for thickness and compression density.

[0005] Electrode sheets are typically transported via equipment such as roller shafts during the production process. Taking the slitting of cell electrode sheets for wound-type batteries as an example, the electrode sheet is cut into two parts using a cutter, and the two cut parts are separated along upper and lower flat rollers to obtain two material rolls. Current slitting machines require manual adjustment of the electrode sheet width offset and appearance defects, which cannot be adjusted in real time; consequently, placement defects occur frequently, affecting the yield of subsequent production and reducing production efficiency.

[0006] Accordingly, the present application provides an electrode sheet slitting system and a slitting method for detecting the offset of an electrode sheet in real time. In the production process of electrode sheet slitting, by implementing an automatic correction closed-loop of the electrode sheet, the consistency of cell capacity can be improved and the placement defect rate of the electrode sheet can be reduced. This improves electrode sheet yield and production efficiency, ensures worker safety, and enhances battery performance. The present application includes the following technical solutions:

[0007] According to one embodiment, the present application provides an electrode sheet slitting system comprising an electrode sheet cutting device, an information collection module, and a processor, wherein the electrode sheet cutting device is used to slit a first electrode sheet into a plurality of second electrode sheets, wherein the width of the first electrode sheet is greater than that of the second electrode sheet; the information collection module is used to collect information of the second electrode sheet; and the processor acquires information and determines whether an offset occurs in the second electrode sheet according to the information, and if an offset occurs, the processor is used to correct the first electrode sheet.

[0008] The electrode sheet slitting system presented in this application can detect information about the electrode sheet in real time during the electrode sheet slitting process of a battery cell. Compared to manual inspection followed by manual correction, it reduces the placement defect rate of the electrode sheet. In addition, it can reduce production costs, such as labor and material costs. Furthermore, it can ensure worker safety by reducing contact between the worker and the machine.

[0009] In some embodiments, the information collection module includes an image collection module.

[0010] Using image acquisition modules offers cost and performance advantages compared to other information collection systems, is highly mature, and is easy to apply in industries.

[0011] In some embodiments, the image acquisition module is a charge-coupled device camera.

[0012] Charge-coupled device cameras are widely applied in industrial production for product quality detection due to their advantages of high-quality imaging, low noise, high sensitivity, and fast readout.

[0013] In some embodiments, the electrode sheet slitting system further comprises a first roller shaft and a second roller shaft. A plurality of second electrode sheets are sequentially numbered, wherein the first roller shaft and the second roller shaft are used to transmit the slit odd-numbered second electrode sheets and even-numbered second electrode sheets, respectively.

[0014] Each of the first and second roller axes transmits multiple second electrode sheets, and transmitting them in two directions using only two roller axes saves more system space and is simpler in structure compared to a design where each second electrode sheet is transmitted in different directions by separate roller axes. In addition, such a system is easier to manufacture.

[0015] In some embodiments, the image acquisition module includes a first information acquisition submodule used to collect information of an odd number of second electrode sheets on a first roller axis.

[0016] In some embodiments, the image acquisition module further includes a second information acquisition submodule used to collect information of an odd number of second electrode sheets on a second roller axis.

[0017] The information collection module collects information from the electrode sheet along the roller axis without collecting information from other locations in the electrode sheet transmission direction. Since the movement state of the electrode sheet along the roller axis is relatively stable, the accuracy and quality of information collection can be improved.

[0018] In some embodiments, the information of the second electrode sheet includes the width of the second electrode sheet, and correspondingly, the offset includes a width offset, wherein the direction of the width is a direction perpendicular to the transmission direction of the second electrode sheet.

[0019] Width offset information is easier to acquire and process compared to angle offset information, and determining whether correction is needed by assessing the width offset is easy to implement due to its low complexity.

[0020] In some embodiments, the step of determining whether a width offset occurs includes the step of a processor calculating the width offset of a second electrode sheet relative to a standard width, and the step of determining that a width offset has occurred if the width offset is greater than a lower threshold value of the width offset error.

[0021] In some embodiments, if the width offset is smaller than the upper threshold of the width offset error, the processor calculates a correction value, and accordingly, the step of the processor correcting the first electrode sheet includes the step of correcting the first electrode sheet according to the correction value.

[0022] The width offset error of each second electrode sheet is compared through the determined standard width, and this error is a correction value; the method is simple and convenient for the processor to calculate the correction value and correct the first electrode sheet.

[0023] In some embodiments, if the width offset error is greater than or equal to the upper threshold of the width offset, the system alerts.

[0024] When the second electrode sheet exceeds the upper threshold of the width error, it is considered a defective product; in this case, an alarm is sounded and the machine is stopped, making it convenient for the operator to process the electrode sheets to be discarded in a timely manner, thereby improving production efficiency.

[0025] In some embodiments, the system further includes a third roller axis for transmitting a first electrode sheet, and correspondingly, the information collection module further includes a third information collection submodule for collecting information of the first electrode sheet from the third roller axis.

[0026] In some embodiments, the first electrode sheet includes a first surface and a second surface, and the third information collection submodule collects information of the first surface of the first electrode sheet.

[0027] In some embodiments, the second electrode sheet includes a first surface and a second surface, and the first information collection submodule and the second information collection submodule each collect information on the second surface of the second electrode sheet.

[0028] Compared to a solution that collects information on both sides for each electrode sheet, the above-described embodiment can not only completely collect information on the first and second sides of the electrode sheet, but also save system space and reduce the number of information collection modules.

[0029] In some embodiments, the information of the first electrode sheet and / or the second electrode sheet further includes appearance information, and based on the appearance information, the processor is also used to determine whether there is an appearance defect in the first electrode sheet and / or the second electrode sheet; if there is an appearance defect, it notifies the alarm notifier to notify the alarm.

[0030] It enhances the utilization of the information collection module by detecting appearance defects during the offset determination and correction process. By detecting appearance defects in real-time, it reduces the outflow of defective electrode sheets. In the event of a defect, it provides a timely alarm, making it convenient for operators to investigate and position the failure problem.

[0031] In some embodiments, the information collection module additionally includes a light source to supplement light to the image acquisition module. Since the light source is convenient to adjust, the acquired image can be made clearer, and the detection accuracy can be improved by acquiring image information from multiple frames under different lighting conditions.

[0032] In some embodiments, the straight line at which the radius from the centrifugal point of the first roller axis to the contact point between the second electrode sheet and the first roller axis is located is the centerline of the straight line from the image acquisition module to the contact point and the straight line from the light source to the contact point. This installation is convenient for simultaneous control of the image acquisition module and the light source.

[0033] According to another aspect of the present application, the present application provides a method for slitting an electrode sheet, comprising the step of slitting a first electrode sheet into a plurality of second electrode sheets, wherein the width of the first electrode sheet is greater than that of the second electrode sheet; the step of collecting information of the second electrode sheet; and the step of obtaining information and determining whether an offset occurs in the second electrode sheet according to the information, and correcting the first electrode sheet if an offset occurs.

[0034] The electrode sheet slitting method presented in this application detects the offset of the electrode sheet in real time during the electrode sheet slitting process of a battery cell and, by comparing it with manual correction after manual inspection, reduces the electrode sheet placement defect rate, improves the electrode sheet slitting yield, reduces production costs such as labor and material costs, and ensures the safety of the worker by reducing contact between the worker and the machine.

[0035] In some embodiments, two roller axes, a first roller axis and a second roller axis, are used to transmit slit second electrode sheets of odd numbers and second electrode sheets of even numbers, respectively.

[0036] Compared to a method of transmitting multiple slit second electrode sheets in two directions and transmitting each second electrode sheet in a different direction via a roller axis, it saves more system space and is more convenient for design in terms of structure.

[0037] In some embodiments, the step of collecting information of the second electrode sheet includes collecting information of the second electrode sheet with an odd number on the first roller axis and information of the second electrode sheet with an even number on the second roller axis.

[0038] Since the movement state of the electrode sheet on the roller axis is relatively stable, information from the electrode sheet can be collected on the roller axis to improve the quality of information collection.

[0039] In some embodiments, the information of the second electrode sheet includes the width of the second electrode sheet, and correspondingly, the offset includes a width offset, wherein the direction of the width is a direction perpendicular to the transmission direction of the second electrode sheet.

[0040] Width offset information is easier to acquire and process compared to angle offset information, and determining whether correction is needed by assessing the width offset is easy to implement due to its low complexity.

[0041] In some embodiments, the electrode sheet slitting method further includes the step of collecting information of the first electrode sheet.

[0042] Appearance defects of the electrode sheet are detected first before correction. This facilitates the timely processing of defective electrode sheets for the operator, thereby improving production yield.

[0043] In some embodiments, the electrode sheet slitting method further includes information of the first electrode sheet and / or the second electrode sheet, additionally including appearance information, and, based on the appearance information, a step of determining whether there is an appearance defect in the first electrode sheet and / or the second electrode sheet; and a step of notifying an alarm if there is an appearance defect.

[0044] Detecting appearance defects during the offset judgment and correction process is advantageous for effective correction. By detecting appearance defects in real-time, it reduces the influx of defective products into subsequent processes, which is beneficial for guaranteeing battery performance. In the event of a defect, it provides a timely alert, making it convenient for operators to investigate and position the issue.

[0045] In some embodiments, the appearance information includes the appearance information of the first surface and the second surface of the first electrode sheet and the second electrode sheet.

[0046] In some embodiments, the appearance information includes the appearance information of a first surface of a first electrode sheet and the appearance information of a second surface of a second electrode sheet.

[0047] In this way, information on the first and second sides of the electrode sheet can be completely collected, and since there is no need to collect information on both sides for the first electrode sheet and each second electrode sheet, resource waste caused by redundant information collection is reduced.

[0048] The electrode sheet slitting system and method presented in this application can improve the consistency of cell capacity by implementing an automatic correction closed loop for electrode sheets. By reducing the placement defect rate of electrode sheets, material costs are reduced, thereby improving electrode sheet yield and production efficiency. It can also reduce the outflow of defective electrode sheets by monitoring appearance defects in real time. Furthermore, it can provide early warning of defects and stop the machine, making it convenient for operators to investigate and position failure issues. It improves production safety by reducing contact between operators and production equipment. Brief explanation of the drawing

[0049] To more clearly explain the technical solution of the embodiments of the present application, the drawings to be used in the embodiments of the present application are briefly introduced below. It is obvious that the drawings described below are merely some embodiments of the present application, and that a person skilled in the art can obtain other drawings from the drawings without striving to create an inventive step. In the drawings: FIG. 1 is a schematic diagram of an electrode sheet slitting system according to an embodiment of the present application. FIG. 2 is a schematic diagram of an electrode sheet slitting system according to another embodiment of the present application. FIG. 3 is a schematic diagram of an electrode sheet slitting system according to another embodiment of the present application. FIG. 4 is a schematic diagram of an information collection module according to an embodiment of the present application. FIG. 5 is a schematic diagram of an information collection module according to an embodiment of the present application. FIG. 6a is a schematic diagram of a second electrode sheet according to an embodiment of the present application. FIG. 6b is a schematic diagram of another first second electrode sheet according to an embodiment of the present application. FIG. 7 is a schematic diagram of an electrode sheet slitting system according to another embodiment of the present application. FIG. 8 is a flowchart of an electrode sheet slitting method according to an embodiment of the present application. FIG. 9 is a flowchart of an information collection method for an electrode sheet slitting method according to an embodiment of the present application. FIG. 10 is a flowchart of a defect detection method for an electrode sheet slitting method according to an embodiment of the present application. Specific details for implementing the invention

[0050] The embodiments of the present application are described in further detail below by combining the drawings and examples. The following detailed description of the embodiments and drawings are used to illustratively explain 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.

[0051] In the description of this application, unless otherwise specified, "plural" means two or more, and it must be explained that terms "first," "second," "third," etc. are used only for illustrative purposes and should not be understood as implying or suggesting relative importance.

[0052] The term "Examples" as used in this application means that specific features, structures, or characteristics described in the Examples may be combined and included in at least one Example of this application. The appearance of this phrase in various places within the specification does not necessarily refer to the same Example, nor are they independent or alternative Examples mutually exclusive from other Examples.

[0053] In the embodiments of this application, the same reference numerals denote the same components, and for simplicity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the dimensions, such as thickness, length, and width of the various components of the embodiments of this application illustrated in the drawings, and the overall thickness, length, and width of the integrated device, are merely illustrative descriptions and do not constitute any limitations to this application.

[0054] The term "plural" as used in this application means two or more (including two).

[0055] In this application, the term "and / or" is merely an association describing related objects and indicates that there may be three relationships; for example, A and / or B may represent three cases where A exists, A and B exist simultaneously, or B exists. Additionally, in this application, the character " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0056] In the production process of battery cell electrode sheets, current slitting machines cannot detect electrode sheets in real time, so if an offset occurs, it easily leads to placement defects. During the production process, operators only perform manual and visual inspections of the electrode sheets, and when deviations in the dimensions of the electrode sheets are detected, they correct them manually, but since adjustments cannot be made in real time, placement defects occur frequently and affect production efficiency.

[0057] The electrode sheet slitting system and method presented in this application implement an automatic electrode sheet correction closed loop by collecting information on the electrode sheet in real time and correcting the electrode sheet. By reducing the placement defect rate of the electrode sheet, the electrode sheet yield and production efficiency are improved. The slitting system replaces manual detection with automatic detection, thereby reducing labor costs, improving product stability, and ensuring worker safety.

[0058] In this 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, and the embodiments of this application are not limited thereto. A key component that enables the battery to implement a repetitive charge and discharge function is an electrode assembly within the battery cell, and the electrode assembly includes an electrode sheet and a separator, and the electrode sheet includes a positive electrode sheet and a negative electrode sheet. The separator is generally installed between the positive electrode sheet and the negative electrode sheet and is used to insulate the positive electrode sheet and the negative electrode sheet from each other, and the material of the separator may be polypropylene (PP) or polyethylene (PE), etc. The battery cell operates primarily by relying on the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0059] Here, the electrode sheet comprises a current collector and an active material layer. The current collector includes a coated area coated with an active material layer along the width direction of the electrode sheet and a blank foil area not coated with an active material layer. A tab is cut into the current collector in the blank foil area. The tab is a metal conductor drawn from the positive and negative electrodes of the battery cell and serves as a contact point when the battery is charged or discharged. In actual practice, the blank foil area is also referred to as the "tap area." The positive current collector may be aluminum foil, and the positive active material layer comprises a ternary material, lithium manganate, or lithium iron phosphate. The negative current collector may be copper foil, and the negative active material layer comprises graphite or silicon.

[0060] Slitting refers to slitting a single electrode sheet into multiple electrode sheets along the width direction according to the structure and specifications of the battery design. Generally, for wound-type batteries, the electrode sheet is slit into multiple electrode sheets according to the design width; for stacked-type batteries, before slitting the electrode sheet into electrode sheets, the electrode sheet material roll must first be slit into strips and then cut to the required dimensions.

[0061] The electrode sheet slitting system and method according to an embodiment of the present application may be performed before the die-cutting process or after the die-cutting process. Die-cutting refers to cutting a tab in the empty foil area of ​​the electrode sheet according to the design specifications of the tab. Since there is a longer conveyor belt path between the electrode sheet slitting process and the die-cutting process, the electrode sheet must be corrected before slitting to adjust the position of the electrode sheet's conveyor belt in order to improve the electrode sheet slitting quality.

[0062] As illustrated in FIG. 1, an embodiment of the present application provides an electrode sheet slitting system (1000) comprising an electrode sheet cutting device (200), an information collection module (300), and a processor (700). The electrode sheet cutting device (200) is used to slit a first electrode sheet (110) into a plurality of second electrode sheets (120), wherein the width of the first electrode sheet (110) is greater than the width of the second electrode sheet (120). The information collection module (300) is used to collect information of the second electrode sheet (120). The processor (700) is used to acquire information of the second electrode sheet (120) and to determine whether an offset of the plurality of second electrode sheets (120) occurs according to the information, and if an offset occurs, the processor (700) corrects the first electrode sheet (110).

[0063] Here, the electrode sheet cutting device (200) may be any mechanism capable of implementing the electrode sheet cutting function. As illustrated in FIG. 2, the electrode sheet cutting device (200) is used to slit a first electrode sheet (110) into a plurality of second electrode sheets (120). In some embodiments, the electrode sheet cutting device (200) may include a plurality of cutting members, and different cutting members are used to cut different regions of the electrode sheet. For example, each of the plurality of cutting members acts on the center of a plurality of empty foil regions or coating regions of the first electrode sheet (110) to be slit to divide the first electrode sheet (110) into several second electrode sheets (120) of equal width. Currently, the slitting process of the battery electrode sheet mainly uses the following three types: (1) disk shearing; (2) die punching; (3) laser cutting. The quality and dimensional data of the electrode sheet cutting edges have a direct impact on the performance and safety of the finished battery. Here, laser cutting is applied to the production of battery electrode sheets in the industrial cutting process because it has the characteristics of high production efficiency and excellent process stability compared to disk shearing and die punching. Accordingly, the cutting member may include, but is not limited to, a cutter, a slitting head, a laser beam, etc. The cutting member is used to complete the strip slitting of the electrode sheet by performing the slitting operation described above. In the embodiment of the present application, for convenience of distinction, the electrode sheet before slitting is referred to as the first electrode sheet (110), and the slit electrode sheet is referred to as the second electrode sheet (120).

[0064] The information collection module (300) is always in a state of collecting information and can transmit the collected information to the processor (700) in real time for processing. The information collection module (300) includes at least one information collection submodule for collecting information of a plurality of second electrode sheets (120). The information collection module (300) can collect various feature information such as the shape, size, position, brightness, color, and texture of the second electrode sheet (120) in the slitting system (1000). The method by which the information collection module (300) collects information includes, but is not limited to, the following: (1) Infrared / thermal infrared detection: Infrared or thermal infrared images invisible to the naked eye are captured using an infrared sensor or a thermal infrared camera. (2) Camera capture: Images are captured by scanning line by line or frame by frame using a digital camera or a video camera. (3) Video collection: A continuous video stream is collected through a video camera or a camera, and image frames are extracted from the continuous video to obtain information of the electrode sheet. (4) 3D Scanning: Using technology such as structured light, time of flight (TOF), or stereo cameras, three-dimensional shape and texture information of an object is obtained.

[0065] Here, structured light is a system structure composed of a projector and a camera. Specific light information is projected onto the surface and background of an object using a projector, and then collected by a camera. This method calculates information such as the position and depth of an object based on changes in light signals generated by the object, and further reconstructs the entire three-dimensional space. TOF technology is a technique that further understands specific characteristics of a particle or medium by measuring the time it takes for an object, particle, or wave to travel a certain distance in a fixed medium (the medium, distance, and time are all known or measurable). A stereoscopic camera refers to a camera capable of obtaining pairs of stereoscopic images through simultaneous shooting. Correspondingly, in some embodiments, the information collection submodule may be a (thermal) infrared sensor, a dedicated industrial camera, a digital X-ray imaging device, a video acquisition device, a 3D scanning device, or a general digital camera, a video camera, a mobile phone camera, etc. In an embodiment of the present application, collecting information of the second electrode sheet (120) refers to obtaining information of the second electrode sheet (120) through an information collection module (300), and this information includes all necessary information that can be used to determine the offset of the second electrode sheet (120), including information such as the shape, size, and position of the second electrode sheet (120).

[0066] In an embodiment of the present application, the processor (700) may be a Central Processing Unit (CPU) or an Application Specific Integrated Circuit (ASIC) for performing a plurality of different signal processing processes. The processor (700) acquires electrode sheet information collected from the information collection module (300) in real time, which includes relevant information capable of determining the electrode sheet offset. The processor (700) outputs an offset determination result after undergoing different signal processing. The processor (700) also outputs a correction command for correcting the electrode sheet.

[0067] Here, the electrode sheet offset refers to a case where the offset amount of the slit electrode sheet width compared to the standard width exceeds the lower limit of the error threshold but does not exceed the upper limit of the error threshold, and in this case, the electrode sheet can be corrected to improve the slit electrode sheet width. The processor (700) is also called an industrial control computer and is used to display the production status of the device and to control the device to perform corresponding tasks, and generally includes a host computer and a slave computer. Conceptually, the controller and the service provider are the host computer, and the controlled and the service recipient are the slave computer, and can also be understood as a relationship between a host computer and a slave computer, and the master-slave relationship between the host computer and the slave computer can be converted.

[0068] In an embodiment of the present application, the host computer acquires information about the electrode sheet and, through computational processing, first transmits a corresponding command to the slave computer; then, the slave computer interprets a corresponding timing signal that controls the relevant device elements and driving device according to this command. The slave computer reads device status data (generally an analog signal), converts it into a digital signal, and feeds it back to the host computer. With respect to the host computer and the slave computer, the host computer (Host Computer / Master Computer / Upper Computer) refers to a computer capable of directly issuing control commands; it is generally a Human Machine Interface device such as a workstation or touchscreen, and includes hardware and software.

[0069] In an embodiment of the present application, the screen of the host computer displays various information of the acquired electrode sheet and also displays the processing results of the electrode sheet information, including offset results. The slave computer is a computer that directly controls the device and acquires the device status, and is generally a microcomputer such as a PLC (Programmable Logic Controller) or a Single Chip Microcomputer (Slave Computer / Lower Computer). Here, the PLC is a digital computational controller used for automation control that has a microprocessor and can load, store, and execute control commands in memory at any time. The PLC is composed of functional units such as a CPU, command and data memory, input / output interface (I / O interface), power supply, and analog-to-digital (A / D) converter, and includes various functions such as logic control, timing control, analog control, and multi-device communication. A single-chip microcomputer is an integrated circuit chip utilizing ultra-large integrated circuit technology. It integrates functions such as a CPU with data processing capabilities, random access memory (RAM), read-only memory (ROM), various I / O interfaces and interrupt systems, and timers / counters (which may also include circuits such as display driver circuits, pulse width modulation circuits, analog multiplexing, and A / D conversion) onto a single silicon chip to form a small and complete microcomputer system.

[0070] In the embodiments of the present application, offset refers to the occurrence of a spatial offset. An offset occurring in the second electrode sheet (120) refers to a case where the second electrode sheet (120) is slit at an angle, that is, the slitting area along the width direction is misaligned and fails to meet the requirements for slitting precision. If slitting continues based on the offset, it will result in a poor placement of the second electrode sheet (120). This not only affects the yield of the slitting process, but also, if the second electrode sheet (120) with unsatisfactory dimensional precision is fed into a subsequent winding or lamination process and a situation occurs where the negative electrode fails to completely cover the positive electrode, it further affects the performance of the battery, such as the state of charge (SOC) of the cell. In some embodiments, the offset of the second electrode sheet (120) can be understood as the position of the first electrode sheet (110) being offset with respect to the position of the cutter, and the cutter not slitting along the center axis of the slitting area, so that the slit electrode sheet is wide on one side and narrow on the other.

[0071] When it is determined that an offset has occurred, the processor (700) corrects the first electrode sheet (110). In an embodiment of the present application, when it is determined that an offset has occurred and the amount of the offset 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 electrode sheet (110) according to the correction value. Correction generally refers to a technical operation to keep the sides of the roll material neat and consistent during the roll material winding process. In an embodiment of the present application, correction refers to an operation to ensure that the width of each slit area along the width direction is kept consistent during slitting by adjusting the position of the first electrode sheet (110) after an offset has occurred. In some embodiments, adjusting the position of the first electrode sheet (110) includes adjusting the angle, the position in the width direction, etc., within the slitting system (1000), and moving the first electrode sheet (110) so that the cutter position is aligned with the center axis of the cutting position.

[0072] In some embodiments, as illustrated in FIG. 3, the slitting system (1000) further includes a correction module (400) for adjusting the position of an electrode sheet under the control of a processor (700). Correspondingly, the processor (700) corrects the first electrode sheet (110) by controlling the correction module (400). The correction module (400) is used to correct the first electrode sheet (110) according to a control command from the processor (700). The correction module (400) generally includes a correction mechanism and a motor. The correction mechanism is configured with different specifications according to different strokes and thrusts, and is used to receive a correction command from the processor (700), control the motor to drive the correction mechanism, and perform a correction operation.

[0073] In some embodiments, the correction mechanism may include a support frame for performing correction, a first correction roller, and a second correction roller to maintain the shape of the slit second electrode sheet (120) relatively consistent. There are no limitations on the shape and manufacturing material of the support frame. Both the first correction roller and the second correction roller are rotatably installed on the support frame. The first correction roller and the second correction roller are installed opposite each other, and the electrode sheet passes through the roller gap between the first correction roller and the second correction roller. The first correction roller and the second correction roller engage to clamp the electrode sheet and correct the position of the electrode sheet in the axial direction of the first correction roller. The corrected first electrode sheet (110) is sent to an electrode sheet cutting device (200) for slitting. The first correction roller and the second correction roller are installed in the conveying direction of the first electrode sheet (110), and the first electrode sheet (110) includes a first surface and a second surface facing each other, and the first correction roller and the second correction roller are installed on both sides of the first electrode sheet (110), that is, the first correction roller contacts the first surface and the second correction roller contacts the second surface, and the first correction roller and the second correction roller are clamped to the first surface and the second surface of the electrode sheet to adjust the position of the first electrode sheet (110) in the axial direction of the first correction roller, thereby correcting the position when slitting the first electrode sheet (110).

[0074] The electrode sheet slitting system (1000) presented in the embodiment of the present application can detect information of the electrode sheet in real time during the electrode sheet slitting process of a battery cell. Compared to manual inspection followed by manual correction, it reduces the defect rate of electrode sheet placement and improves the yield of electrode sheet slitting. In addition, it reduces production costs such as labor and material costs and simultaneously ensures worker safety by reducing contact between the worker and the machine.

[0075] In some embodiments, as illustrated in FIG. 4, the information collection module (300) includes an image collection module (301).

[0076] In some embodiments, the image acquisition module (301) is a charge coupling element camera.

[0077] Here, the image acquisition module (301) refers to any of the aforementioned devices that collect information in the form of images, such as dedicated industrial cameras, digital cameras, video cameras, mobile phone cameras, etc. In some embodiments, the charge-coupled device camera is a CCD (Charge-Coupled Device) camera, which can convert light into electric charge and store and transmit the electric charge. The CCD camera may also extract the stored electric charge and change the voltage. The CCD camera is widely applied in industry due to its high color reproduction accuracy, small volume, light weight, resistance to magnetic fields, vibration resistance, and shock resistance characteristics. 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 sheet, and converts the electrical signal into a digital signal through analog-to-digital conversion.

[0078] Using an image acquisition module (301) offers cost and performance advantages compared to other information acquisition systems. Additionally, image acquisition technology is highly mature and easily applied in industry. Compared to other image acquisition devices, the CCD camera has advantages such as high-quality imaging, low noise, high sensitivity, and fast reading, resulting in high detection efficiency and accuracy.

[0079] In some embodiments, as illustrated in FIG. 4, the information collection module (300) generally further includes a light source (302) to supplement light to the image collection module (301). By adjusting the position and angle of the image collection module (301) and the light source (302) with respect to the electrode sheet, and adjusting the brightness of the light source, multiple frames of images to be detected at different positions, different directions, and different exposure rates can be obtained for subsequent detection.

[0080] In some embodiments, as illustrated in FIG. 5, straight line AB passes through the centrifugal point B of the first roller shaft (410) and the contact point A between the second electrode sheet (121) and the first roller shaft (410), and is the centerline of straight line AC from the image acquisition module (301) to contact point A and straight line AE from the light source (302) to contact point A. That is, the angle between the centerline AB and the straight line AB from the image acquisition module (301) to contact point A is equal to the angle between the centerline and the straight line AE from the light source (302) to contact point A, i.e., ∠α. In some embodiments, ∠α may be 30°, and the distance (DD) from the image acquisition module (301) to the contact point may be 590 mm, which is referred to as the light source distance.

[0081] By selecting the image acquisition module (301) to collect information, it can be used not only to detect the offset of the electrode sheet but also to detect appearance defects of the electrode sheet. Therefore, there is no need to install other measuring devices or image acquisition devices separately, thereby saving costs and system space. The light source (302) can be conveniently adjusted to make the acquired image clearer, and the detection accuracy can be improved by acquiring image information from multiple frames under different lighting conditions.

[0082] Electrode sheets are generally stored and transported in the form of material rolls during the manufacturing process for coating, cold pressing, slitting, and die cutting. To improve production efficiency, the electrode sheet material rolls generally include multiple active material coated areas and blank foil areas repeatedly arranged along a direction perpendicular to the electrode sheet transport direction, that is, along the width direction of the electrode sheet. As described above, the coated area is an area of ​​the current collector coated with an active material layer. The blank foil area is a current collector not coated with an active material layer.

[0083] In some embodiments, slitting may be performed from the centerline of a blank foil area or a coating area according to different cutting positions. FIG. 6a is a schematic diagram of slitting a plurality of second electrode sheets (120) in a blank foil area. FIG. 6b is a schematic diagram of slitting a plurality of second electrode sheets (120) in a coating area. As shown in FIG. 6a, the second electrode sheet (120) may include a coating area along the width direction and a blank foil area on both sides of the coating area; or as shown in FIG. 6b, it may include a blank foil area and a coating area on both sides of the blank foil area. The electrode sheet cutting device (200) slits the first electrode sheet (110) from the centerline of a plurality of blank foil areas (Fig. 6a) or coating areas (Fig. 6b) arranged repeatedly along the width direction to obtain a plurality of second electrode sheets (120-1, 120-2, 120-3, 120-4) of the required specifications. A plurality of second electrode sheets (120) are numbered sequentially. After sequential numbering, the plurality of second electrode sheets (120) are divided into two paths, odd numbered and even numbered, and each is transported.

[0084] In some embodiments, the slitting system (1000) additionally includes a plurality of roller shafts. As a transmission assembly of the slitting system (1000), they are each installed at different positions in the conveying direction. A transmission assembly is a member or mechanism that transmits power from one part of a machine to another so that the machine or machine member moves or operates. Due to friction between the roller shaft and the second electrode sheet (120), the self-rotation of the roller shaft can rotate the second electrode sheet (120), thereby causing the second electrode sheet (120) to be continuously forward-transported along the conveying direction.

[0085] In some embodiments, as illustrated in FIGS. 2 and 3, the slitting system (1000) comprises two roller axes, each being a first roller axle (410) and a second roller axle (420). Here, the first roller axle (410) is used to transport a plurality of slit odd-numbered second electrode sheets (e.g., 120-1, 120-3, etc.), and the second roller axle (420) is used to transport a plurality of slit even-numbered second electrode sheets (120-2, 120-4, etc.). In other embodiments, the number of roller axles is equal to the number of slit second electrode sheets (120), and each roller axle transports only one second electrode sheet (120). Compared to a design in which multiple slit second electrode sheets (120) are transmitted in two directions and each second electrode sheet (120) is transmitted in a different direction using a different roller axis, the system space is saved more and the design is more convenient in terms of structure. Each second electrode sheet (120) is transported in a different direction using a different roller axis and has advantages such as more precise transport.

[0086] In some embodiments, as illustrated in FIGS. 2 and 3, the image acquisition module (300) includes a first information acquisition submodule (310) used to collect information of an odd-numbered second electrode sheet (120-1) on a first roller axis (410). In other embodiments, the image acquisition module (300) further includes a second information acquisition submodule (320) used to collect information of an odd-numbered second electrode sheet (120-2) on the second roller axis (420). The first information acquisition submodule (310) and the second information acquisition submodule (320) generally include the same information acquisition device.

[0087] In some embodiments, the first information collection submodule (310) and the second information collection submodule (320) may be industrial cameras for collecting information of the second electrode sheet (120), and the industrial cameras have high frame rates, comprehensive information collection, and high-quality imaging features. They are suitable for high-quality image processing algorithms and have stable performance. They are easy to mount, and the camera structure is compact and robust so they are not easily damaged. They can operate continuously for a long time and can be used in harsher environments.

[0088] In some embodiments, each second electrode sheet (120) completely collects information of all slit second electrode sheets (120) corresponding to each information collection submodule.

[0089] The information collection module (300) collects information of the electrode sheet at the roller axis without collecting information at other locations in the electrode sheet transmission direction. This can improve the quality of information collection because the movement state of the electrode sheet at the roller axis is relatively stable.

[0090] In some embodiments, the information of the second electrode sheet (120) includes the width of the second electrode sheet (120), and correspondingly, the step of the processor (700) determining the offset includes the step of determining whether a width offset occurs, wherein the direction of the width is a direction perpendicular to the transmission direction of the second electrode sheet (120).

[0091] In some embodiments, the processor (700) compares the error between the width of the slit second electrode sheet (120) and the standard width to determine whether a width offset occurs, and the step of determining the standard width of the second electrode sheet (120) including the standard empty foil area width and the standard coating area width. The width offset of the second electrode sheet (120) with respect to the standard width is calculated. If the width offset is less than or equal to the lower threshold of the width offset error, it is determined that no width offset has occurred. If the width offset is greater than the lower threshold of the width offset error, it is determined that a width offset has occurred. Here, in the form of two types of second electrode sheets (120) as shown in FIGS. 6a and 6b, the standard width refers to selecting the width of the empty foil area or coating area at any edge of the electrode sheet according to the electrode sheet material and setting it as the standard width of the electrode sheet. In the case of the second electrode sheet (120) shown in FIG. 6a, the cutting position is the centerline of each empty foil area, and the standard width is the width of the standard empty foil area. Correspondingly, for the second electrode sheet (120) as illustrated in FIG. 6b, the standard width is the standard coating area width. In some embodiments, when the slitting location is a blank foil area, the lower threshold value of the width offset error of the blank foil area is 1 mm and the upper threshold value is 2 mm. In some embodiments, when the slitting location is a coating area, the lower threshold value of the width offset error of the coating area is 0.5 mm and the upper threshold value is 1 mm.

[0092] Width offset information is easier to acquire and process compared to angle offset information, and determining whether correction is needed by assessing the width offset is easy to implement due to its low complexity.

[0093] In some embodiments, the slitting system (1000) further includes, when the processor (700) determines that an offset has occurred, if the width offset is greater than the upper threshold of the width offset error, the processor (700) notifies the alarm notifier (800) to sound an alarm. If the width offset exceeds the upper threshold of the width offset error, the second electrode sheet (120) slit in this part is considered defective and must be inspected and processed by an operator. After the alarm notifier instructs the operator to stop the machine and process the defective product, the slitting system (1000) continues to operate. The processor (700) notifies the alarm notifier (800) to sound an alarm by outputting an alarm command. In some embodiments, the alarm notifier (800) may include an alarm indicator light and / or a buzzer. When the alarm notifier (800) signals an alarm, the alarm indicator light flashes and / or the buzzer sounds. The alarm notification can promptly inform operators to detect and address electrode sheet width offset issues, thereby reducing the electrode sheet defect rate and improving production efficiency.

[0094] Additionally, in some embodiments, the processor (700) further includes a step of determining whether the coating area is misaligned before determining whether an offset occurs. The processor (700) determines the misalignment of the coating area by comparing the coating positions of the first surface and the second surface of the first electrode sheet (110). The position offset error is defined as the distance error from the edge of the coating area of ​​the first surface and the second surface to the edge of the electrode sheet. If this position offset error is greater than the misalignment threshold, the width offset determination is no longer performed. The processor (700) warns the alarm notifier (800) and instructs it to stop the machine and process this portion of the electrode sheet. If the offset error of the coating area position is smaller than the misalignment threshold, the processor (700) continues to determine the width offset. In some embodiments, for a plurality of second electrode sheets (120) similar to those shown in FIG. 6b, the processor (700) further includes a step of determining whether the coating areas of each slit second electrode sheet (120) are misaligned. The processor (700) determines whether the coating areas of the second electrode sheets (120) are misaligned and may refer to the determination of the misalignment of the coating areas of the first electrode sheet (110). In some embodiments, the misalignment error threshold may be 0.5 mm. By determining whether the coating areas are misaligned before determining whether a width offset occurs, defective electrode sheets can be inspected and processed in a timely manner, thereby reducing resource waste of the slitting system (1000).

[0095] As illustrated in FIGS. 2 and 3, in some embodiments, the slitting system (1000) further includes a third roller shaft (430) for transmitting a first electrode sheet (110), and correspondingly, the information collection module (300) further includes a third information collection submodule (330) for collecting information of the first electrode sheet (110) from the third roller shaft (430).

[0096] Here, the third roller shaft (430) is one of the transmission assemblies of the slitting system (1000) and corresponds to the first roller shaft (410) and the second roller shaft (420). The third information collection submodule (330) maintains consistency with other information collection submodules, making it convenient for processing and manufacturing.

[0097] Collecting information on the first electrode sheet (110) is intended to first detect appearance defects of the electrode sheet before correction, and to process defective electrode sheets in a timely manner to improve yield.

[0098] The electrode sheet includes a first surface and a second surface, namely a front surface and a back surface, and each surface can detect offsets and defects. In some embodiments, information on the first surface of the first electrode sheet (110) can be collected through a third information collection submodule (330). The first information collection submodule (310) and the second information collection submodule (320) each collect information on the second surface of the second electrode sheet (120). In this way, not only can information on the first and second surfaces of the electrode sheet be fully collected, but system space can also be saved and the number of information collection modules (300) can be reduced.

[0099] In some embodiments, two information collection submodules may be used to obtain information on the first surface and the second surface of the first electrode sheet (110), respectively, thereby enabling the complete detection of appearance defects of the electrode sheet before slitting.

[0100] In some embodiments, more information collection submodules may be used to obtain information on the first and second sides of each second electrode sheet (120), respectively, and thus fully detect the appearance defects and offsets of the electrode sheets.

[0101] In some embodiments, the information of the first electrode sheet (110) and / or the second electrode sheet (120) further includes appearance information. Based on the appearance information, the processor (700) is also used to determine whether there are appearance defects in the first electrode sheet (110) and / or a plurality of second electrode sheets (120); if there are appearance defects, it notifies the alarm notifier (800) to notify an alarm.

[0102] Here, appearance information refers to information such as the shape and brightness of the electrode sheet, each corresponding to a different appearance defect. Appearance defects include defects such as wrinkles, irregularities, breakage, bubbles, decarburization, missing coating, missing metal, and dark spots appearing on the surface of the electrode sheet. In some embodiments, shape information corresponds to defects such as wrinkles, irregularities, breakage, bubbles, decarburization, and missing coating, and brightness information corresponds to defects such as missing metal and dark spots.

[0103] In some embodiments, the processor (700) can determine these appearance defects through an image processing algorithm. In some embodiments, the image processing algorithm may use deep learning technology. Multiple frames of images to be detected are acquired at different positions, different directions, and different exposure rates through multiple image collection modules (301) and light sources (302) of different directions. Then, multiple frames of images to be detected are screened based on an image template of the product to be detected to obtain a target image to be detected that includes the product to be detected. When defect detection begins, the processor (700) receives multiple frames of images to be detected of the electrode sheet to be detected uploaded from the image collection module (301). The target images to be detected are input into a pre-trained defect detection model, wherein the pre-trained defect detection model is trained by a large amount of sample image data of each type of defect and outputs a detection result by the defect detection model, wherein the detection result includes defect data such as defect type data, defect size data, and defect location data. Features such as texture, color, and shape of the electrode sheet surface are generally very complex, and the types of defects that appear are also diverse. Deep learning technology can improve the accuracy and precision of defect detection by learning abstract features of defects based on defect sample data of electrode sheets and accurately detecting parts of electrode sheets with similar defect sample shapes.

[0104] In some embodiments, the processor (700) determines that an appearance defect has occurred and outputs an alarm command for the appearance defect to notify the alarm notifier (800) to sound an alarm.

[0105] In some embodiments, as illustrated in FIG. 3, the slitting system (1000) further includes a marking mechanism (600) for printing and attaching a defect label to an appearance defect of the first electrode sheet (110) and / or the second electrode sheet (120). After determining that an appearance defect has occurred in the first electrode sheet (110) and / or the second electrode sheet (120), the processor (700) outputs a labeling signal corresponding to the defect and controls the marking mechanism (600) to attach a defect label corresponding to the defect location of the first electrode sheet (110) and / or the second electrode sheet (120).

[0106] In some cases, by installing multiple measuring devices, the offset of an electrode sheet divided into two is measured and corrected, and automatic correction and detection of appearance defects cannot be implemented simultaneously without considering the detection of appearance defects. By detecting offsets and defects separately, the system integration density is lowered, and a single detection method is not suitable for detecting offsets and defects of electrode sheets divided into multiples. Some embodiments of the present application detect appearance defects during the process of determining and correcting offsets, thereby improving the utilization of the information collection module (300). Since appearance defects are detected in real time, manual timely inspection is not required, which reduces the inflow of defective products into subsequent processes and is advantageous for ensuring battery performance. When a defect occurs, an alarm is provided in a timely manner, making it convenient for engineers to investigate and position the problem.

[0107] As illustrated in FIG. 7, the present application provides a different slitting system (1000). Compared to the slitting system (1000) illustrated in FIG. 2, the transfer assembly of the present embodiment includes more roller axes for conveying electrode sheet roll material. For brevity, parts identical to those of the previously described embodiment are not described again herein.

[0108] Here, multiple roller shafts are installed at different positions in the conveying direction of the slitting system (1000). Multiple roller shafts are installed at the position where the electrode sheet material roll enters the slitting system, and after the roll is fed, it is conveyed within the slitting system in the form of a first electrode sheet (110). Multiple roller shafts are installed in the conveying path of the second electrode sheet (120) to form an irregular conveying path. A roller shaft is installed at the end of the conveying path of the second electrode sheet (120) so that multiple second electrode sheets (120) obtained by slitting can be wound.

[0109] The electrode sheet slitting system (1000) presented in this embodiment can not only detect offset and appearance defects in real time, but also implement the feeding and winding of electrode sheet material rolls, thereby improving the stability of electrode sheet transport on the roller axis and space utilization.

[0110] As illustrated in FIG. 8, an embodiment of the present application further provides an electrode sheet slitting method, which

[0111] A step of slitting a first electrode sheet into a plurality of second electrode sheets, wherein S100, the width of the first electrode sheet is greater than the width of the second electrode sheet; S200, the step of collecting information of the second electrode sheet; S300, the step of obtaining information; S400, the step of determining whether an offset occurs in the second electrode sheet according to the information; and S500, the step of correcting the first electrode sheet if an offset occurs.

[0112] Judgment is a thought process of affirming or denying a situation regarding an object. It determines whether an offset occurs in the slit electrode sheet, that is, whether it is slit at an angle during slitting, and the result of the judgment includes two types of results: that an offset occurs and that no offset occurs.

[0113] The electrode sheet slitting method presented in the embodiments of the present application detects the offset of the electrode sheet in real time during the electrode sheet slitting process of a battery cell. Compared to manual inspection followed by manual correction, it reduces the electrode sheet placement defect rate and improves the yield of electrode sheet slitting. In addition, it can reduce production costs, such as labor and material costs, and at the same time ensure worker safety by reducing contact between the worker and the machine.

[0114] As illustrated in FIG. 9, in some embodiments, the electrode sheet slitting method performs step S210 of transmitting the slit odd-numbered second electrode sheets and even-numbered second electrode sheets, respectively, using two roller axes, a first roller axis (410) and a second roller axis (420).

[0115] Compared to the method of transmitting multiple slit second electrode sheets (120-1 and 120-2) in two directions and transmitting each second electrode sheet (120) in a different direction, it saves more system space and is more convenient for design in structure.

[0116] As illustrated in FIG. 9, in some embodiments, the step S200 of collecting information of the second electrode sheet is

[0117] It includes step S220 of collecting information on the second electrode sheet with an odd number on the first roller axis and information on the second electrode sheet with an even number on the second roller axis.

[0118] Information of the second electrode sheet (120) is collected using an information collection module (300). Information of the second electrode sheet (120-1) is collected through the first information collection submodule (310), and information of the second electrode sheet (120-2) is collected through the second information collection submodule (320). Since the movement state of the electrode sheet on the roller axis is relatively stable, information of the electrode sheet is collected on the roller axis, thereby improving the quality of information collection.

[0119] In some embodiments, the information of the second electrode sheet (120) includes the width of the second electrode sheet (120), and correspondingly, the offset includes a width offset, wherein the direction of the width is a direction perpendicular to the transmission direction of the second electrode sheet (120). According to the method described above, it is determined whether the width of the second electrode sheet (120) has an offset by comparing the width of the second electrode sheet (120) with a standard width. Width offset information is easier to acquire and process than angle offset information, and determining whether correction is required by determining the width offset is easy to implement due to its low complexity.

[0120] As illustrated in FIG. 9, in some embodiments, the electrode sheet slitting method further includes step S230 of collecting information of the first electrode sheet from a third roller axis. Information of the first electrode sheet (110) is collected through a third information collection submodule (330). Collecting information of the first electrode sheet (110) is intended to first detect appearance defects of the electrode sheet before correction. This makes it convenient for the operator to process the defective electrode sheet in a timely manner, thereby improving production yield.

[0121] As illustrated in FIG. 10, in some embodiments, the electrode sheet slitting method further includes the step S600 of determining whether there is an appearance defect in the first electrode sheet (110) and / or the second electrode sheet (120) based on the appearance information; and the step S700 of notifying an alarm if there is an appearance defect.

[0122] Detecting appearance defects during the offset determination and correction process is advantageous for effective correction. Since appearance defects are detected in real-time, manual timely inspections are eliminated, reducing the influx of defective products into subsequent processes and thus helping to guarantee battery performance.

[0123] In some embodiments, the appearance information includes appearance information of a first surface and a second surface of a first electrode sheet (110) and a second electrode sheet (120). In some embodiments, the appearance information includes appearance information of a first surface of the first electrode sheet (110) and appearance information of a second surface of the second electrode sheet (120).

[0124] In this way, information on the first and second sides of the electrode sheet can be completely collected, and since there is no need to collect information on both sides for the first electrode sheet (110) and each second electrode sheet (120), resource waste caused by redundant information collection is reduced. Explanation of the symbols

[0125] 1000-Electrode sheet slitting system, 110-First electrode sheet, 120-Second electrode sheet, 200-Electrode sheet cutting device, 300-Information collection module, 700-Processor, 310-Second information collection submodule, 320-First information collection submodule, 330-Third information collection submodule, 410-First roller shaft, 420-Second roller shaft, 430-Third roller shaft, 400-Correction module, 600-Display mechanism, 800-Alarm notifier, 301-Image collection module, 302-Light source

Claims

Claim 1 An electrode sheet slitting system (1000), comprising: an electrode sheet cutting device for slitting a first electrode sheet (110) into a plurality of second electrode sheets (120), wherein the width of the first electrode sheet (110) is greater than the width of the second electrode sheet (120); an information collection module (300) for collecting information of the second electrode sheet (120); and a processor (700) for acquiring the information and determining whether an offset of the second electrode sheet (120) occurs according to the information, and if an offset occurs, the processor (700) for correcting the first electrode sheet (110). Claim 2 In claim 1, the information collection module (300) includes an image collection module (301), in a system (1000). Claim 3 In paragraph 2, the image acquisition module (301) is a charge coupling element camera, system (1000). Claim 4 In any one of claims 1 to 3, the system (1000) further comprises a first roller shaft (410) and a second roller shaft (420), wherein the first roller shaft (410) and the second roller shaft (420) are used to transmit a slit second electrode sheet (120-1) with an odd number and a second electrode sheet (120-2) with an even number, respectively. Claim 5 In paragraph 4, the system (1000) comprises an image collection module (300) that includes a first information collection submodule (310) used to collect information of an odd number of second electrode sheets (120-1) on the first roller axis (410). Claim 6 In paragraph 5, the first information collection submodule (310) is used to collect information on the second side of the second electrode sheet (120-1) of an odd number, in a system (1000). Claim 7 A system (1000) wherein, in any one of claims 4 to 6, the image collection module (300) further comprises a second information collection submodule (320) used to collect information (120-2) of an odd number of second electrode sheets on the second roller axis (420). Claim 8 In claim 7, the second information collection submodule (320) is used to collect information on the second side of the second electrode sheet (120-2) of an even number, in a system (1000). Claim 9 A system (1000), wherein in any one of claims 1 to 8, the information of the second electrode sheet (120) includes the width of the second electrode sheet (120), correspondingly, the offset includes a width offset, wherein the direction of the width is a direction perpendicular to the transmission direction of the second electrode sheet (120). Claim 10 In any one of claims 1 to 9, the system (1000) further comprises a third roller shaft (130) for transmitting the first electrode sheet (110), and correspondingly, the information collection module (300) further comprises a third information collection submodule (330) for collecting information of the first electrode sheet (110) from the third roller shaft (130). Claim 11 In item 10, the above-mentioned third information collection submodule (330) is used to collect information on the first surface of the first electrode sheet (110), system (1000). Claim 12 A system (1000) wherein, in any one of claims 1 to 11, the information of the first electrode sheet (110) and / or the second electrode sheet (120) further includes appearance information, and the processor (700) determines whether there is an appearance defect in the first electrode sheet (110) and / or the second electrode sheet (120) according to the appearance information, and if there is an appearance defect, notifies the alarm notifier (800) to notify an alarm. Claim 13 An electrode sheet slitting method comprising: a step of slitting a first electrode sheet into a plurality of second electrode sheets, wherein the width of the first electrode sheet is greater than the width of the second electrode sheet; a step of collecting information of the second electrode sheet; and a step of obtaining the information and determining whether an offset occurs in the second electrode sheet according to the information, and if an offset occurs, correcting the first electrode sheet. Claim 14 An electrode sheet slitting method according to claim 13, comprising: a step of collecting information of a first electrode sheet before the step of slitting a first electrode sheet into a plurality of second electrode sheets; a step of performing the step of slitting the first electrode sheet into a plurality of second electrode sheets when it is determined that there are no appearance defects based on the information of the first electrode sheet; and a step of notifying an alarm notifier to notify an alarm when it is determined that there are appearance defects based on the information of the first electrode sheet. Claim 15 A method for slitting an electrode sheet according to claim 13 or 14, wherein the step of acquiring information and determining whether an offset occurs in the second electrode sheet according to the information comprises: a step of acquiring the information; a step of performing the step of determining whether an offset occurs in the second electrode sheet according to the information when it is determined that there is no appearance defect in the second electrode sheet according to the information; and a step of notifying an alarm notifier to notify an alarm when it is determined that there is an appearance defect in the second electrode sheet according to the information. Claim 16 An electrode sheet slitting method according to any one of claims 13 to 15, wherein the information of the second electrode sheet includes the width of the second electrode sheet, and the step of determining whether an offset occurs in the second electrode sheet includes the step of calculating the width offset of the second electrode sheet relative to a standard width, and the step of determining that a width offset has occurred in the second electrode sheet if the width offset is greater than a lower threshold value of the width offset error. Claim 17 In claim 16, the step of correcting the first electrode sheet comprises: a step of calculating a correction value if the width offset is smaller than an upper threshold value of the width offset error; and a step of correcting the first electrode sheet according to the correction value, in an electrode sheet slitting method.

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