Quality traceability system and method for lithium electrode sheets

Abstract

This is a quality traceability system and method for lithium electrode sheets. The system includes an electrode sheet splitting unit, a coating unit, an electrode sheet measuring unit, and a control unit. The electrode sheet splitting unit is used to physically split the lithium electrode sheets to be manufactured; the coating unit is used to identify and coat the physically split lithium electrode sheets; the electrode sheet measuring unit is used to measure the coated lithium electrode sheets; and the control unit controls the operation of the electrode sheet splitting unit, coating unit, and electrode sheet measuring unit, collects and stores data from the physical splitting process, coating process, and measurement process of the electrode sheets, and is used to trace the quality of the lithium electrode sheets based on the stored data. This system can accurately distinguish between good and defective lithium electrode sheets, avoiding situations where defective lithium electrode sheets flow to later processes and good sheets are excessively discarded. This makes the statistics of the good rate of lithium electrode sheets more accurate, and the quality traceability of lithium electrode sheets more convenient and comprehensive.

Description

Technical Field

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[0001] [Cross - reference to Related Applications] This application claims the priority of a Chinese patent application with the application number 202310799413.X and the application title "Quality Traceability System and Method for Lithium Electrode Sheets", which was filed with the China National Intellectual Property Administration on June 30, 2023, and all of its content is incorporated herein by reference.

[0002] [Technical Field] This application relates to the field of quality traceability technology, specifically to a quality traceability system and method for lithium electrode sheets.

Background Art

[0003] The industrial 3.0 era of electronic informatization has further significantly improved the manufacturing process and the degree of automation control, but it has become unable to meet the current technological development needs. Therefore, it is shifting towards the industrial 4.0 era, aiming to develop a new manufacturing model that integrates the physical real world and the virtual network world, precisely manages the entire life cycle of products, and realizes the complete digitization of the manufacturing process and the high - level integration of information and communication technologies.

[0004] Lithium batteries are green batteries with excellent performance, composed of electrode sheets, separators, and electrolytes. Among them, the electrode sheet is the core component and an important constituent part of the lithium battery. If there are appearance defects such as creases, damages, printing leaks, or breakages on the electrode sheet, these defects will not only significantly shorten the service life of the lithium battery but also extremely likely pose significant safety risks during the use process. Therefore, the detection stage of the electrode sheet in the manufacturing process is particularly important and is an important means to ensure the performance reliability of electronic products.

[0005] However, in the current manufacturing flow for coated electrode sheets for lithium batteries, multiple electrode sheets are coated simultaneously, resulting in incomplete weight measurement data during the electrode sheet manufacturing process and gaps in area data. Furthermore, the marking of the electrode sheets is not subdivided, and quality checks of the electrode sheet products are performed on a roll-by-roll basis. If all the electrode sheets in a roll pass the inspection, the entire roll is judged to meet the requirements and proceeds to the next process. However, if there are still defective electrode sheets in the roll, it affects the subsequent processes. In other words, if a quality anomaly occurs in the electrode sheets, it is difficult to determine the specific location of the defective electrode sheet, and as a result, quality checks of the electrode sheets become difficult. If all the electrode sheets in a roll fail the inspection, all the electrode sheets in the roll are judged to not meet the requirements, and the entire roll is discarded. However, there are still good products in the roll, resulting in excessive discarding of good products, wasting electrode sheets, and increasing manufacturing costs. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In view of this, this application provides a lithium electrode sheet quality traceability system and method that solves the technical problems raised in the background art described above by physically dividing the entire roll of electrode sheets and then combining it with a manufacturing execution system to achieve subdivision and quality traceability of electrode sheets, enabling accurate distinction between good and defective electrode sheets, preventing defective electrode sheets from flowing to later processes and excessive waste of good ones, thereby making the statistics of good electrode sheet rates more accurate and making electrode sheet quality traceability more convenient and comprehensive. [Means for solving the problem]

[0007] In a first aspect, this application provides a lithium electrode sheet quality traceability system, which is Includes an electrode sheet splitting unit, a coating unit, an electrode sheet measuring unit, and a control unit. The electrode sheet splitting unit is used to physically split the lithium electrode sheet to be manufactured. The coating unit is used to identify and coat physically separated lithium electrode sheets. The electrode sheet measurement unit is used to measure coated lithium electrode sheets. The control unit controls the operation of the electrode sheet splitting unit, coating unit, and electrode sheet measurement unit, collects and stores data from the physical splitting process, coating process, and measurement process of the electrode sheet, and is used to trace the quality of the lithium electrode sheet based on the stored data.

[0008] The lithium electrode sheet quality traceability system of this application achieves fine-grained physical division of the electrode sheet across the entire roll, thereby enabling fine-grained marking and quality traceability of the electrode sheet. This allows for accurate distinction between good and defective electrode sheets, preventing defective electrode sheets from proceeding to later processes and excessive waste of good ones. As a result, the statistics on the good electrode sheet rate become more accurate, and electrode sheet quality traceability becomes more convenient and comprehensive.

[0009] In one selectable embodiment, the electrode sheet splitting unit includes an unwinding mechanism, a belt meter, a laser coding mechanism, and a winding mechanism, wherein the lithium electrode sheet to be manufactured is unwinded by the unwinding mechanism, passes sequentially through the belt meter and the laser coding mechanism, and is wound up by the winding mechanism.

[0010] This application describes an electrode sheet splitting unit that enables fine-grained physical splitting of the entire roll of lithium electrode sheets, contributing to more accurate quality tracing of lithium electrode sheets.

[0011] In one selectable embodiment, the coating unit includes a laser coding identification device and a coating mechanism, the laser coding identification device being used to identify the electrode sheet number, and the coating mechanism being used to coat and manufacture the lithium electrode sheet to be manufactured; and the electrode sheet measuring unit includes a CCD size measuring device and an electrode sheet weight measuring device, the CCD size measuring device being used to measure the size and position of the coated area on the electrode sheet, and the electrode sheet weight measuring device being used to measure the weight of the electrode sheet, thereby providing feedback on the surface density data of the electrode sheet.

[0012] This application contributes to improving quality and, to some extent, enhances the accuracy of quality tracing for lithium electrode sheets by measuring the size and weight of finely granulated electrode sheets after division using an electrode sheet measurement unit.

[0013] In a second embodiment, the present application provides a lithium electrode sheet quality traceability method that performs quality traceability using a lithium electrode sheet quality traceability system according to the first embodiment, the method being: The steps include obtaining the electrode sheet number of the lithium electrode sheet to be manufactured, and establishing a form database for the ea electrode sheet based on the electrode sheet number, Based on the form database of ea electrode sheets, the steps include physically dividing the lithium electrode sheet to be manufactured and obtaining data on the physical division process of the electrode sheet, The steps include: coating and measuring physically separated lithium electrode sheets, and acquiring data on the coating and measurement processes of the electrode sheets; The process includes storing the electrode sheet number, the form database of the ea electrode sheet, data on the physical division process of the electrode sheet, and data on the coating and measurement processes, and performing quality tracing of the lithium electrode sheet based on the stored data.

[0014] This application enables the physical division of lithium electrode sheets to be manufactured based on a form database of EA electrode sheets, followed by the refinement of electrode sheet markings and quality traceability. Through a comprehensive database dedicated to each EA electrode sheet, adjustment reference data can be provided for pre-adjustment of downstream manufacturing processes. Furthermore, it is possible to accurately distinguish between good and defective electrode sheets, preventing situations where defective electrode sheets flow to later processes and good ones are excessively discarded. This results in more accurate statistics on the good electrode sheet rate and makes electrode sheet quality traceability more convenient and comprehensive.

[0015] In one selectable embodiment, the process of obtaining the electrode sheet number of the lithium electrode sheet to be manufactured includes the steps of inputting order information of the lithium electrode sheet to be manufactured into a control unit, coding the lithium electrode sheet to be manufactured in combination with a pre-configured coding rule, and obtaining the electrode sheet number of the lithium electrode sheet to be manufactured.

[0016] This application provides the advantage of rapid, convenient, and highly accurate quality tracking of electrode sheets by coding the electrode sheets themselves, thereby enabling accurate understanding of the specific condition of the electrode sheets and the quality traceability status corresponding to the electrode sheet number.

[0017] In one selectable embodiment, the process of establishing a form database for ea electrode sheets based on an electrode sheet number includes the steps of obtaining relevant data for each step in the manufacturing of the corresponding electrode sheet based on the electrode sheet number, and establishing a form database for ea electrode sheets based on the relevant data, wherein the relevant data includes the order number, coating batch, slurry batch, date, time, slurry mixing equipment parameters, equipment parameters in the coating process, initial product detection data, and data from the manufacturing process of the electrode sheet, corresponding to the electrode sheet number.

[0018] This application contributes to rapidly achieving fine-grained quality traceability for electrode sheets by storing important data involved in the manufacturing process of ea electrode sheets through a form database of ea electrode sheets.

[0019] In one selectable embodiment, under the control of a control unit, the electrode sheet splitting unit employs a physical laser coding marking method to mark the electrode sheets as units ea, and the process of physically splitting the lithium electrode sheets to be manufactured based on a form database of ea electrode sheets includes the step of using a laser coding mechanism to code and mark the lithium electrode sheets to be manufactured based on the electrode sheet number of the lithium electrode sheets to be manufactured, thereby realizing the physical splitting of the lithium electrode sheets to be manufactured by demarcating the position of each ea electrode sheet.

[0020] This application describes a method for marking electrode sheets in units of ea under the control of a manufacturing execution system, and for achieving fine-grained physical division of the entire roll of lithium electrode sheets using an electrode sheet division unit, thereby contributing to more accurate quality tracing of lithium electrode sheets.

[0021] In one selectable embodiment, after the physical division of the lithium electrode sheet to be manufactured is completed, each ea electrode sheet is coated using a coating mechanism. After the coating of each ea electrode sheet is completed, the size is measured using a CCD size measuring device, and the weight is measured using an electrode sheet weight measuring device. The size data and weight data of each coated ea electrode sheet are then input to and stored in a control unit.

[0022] This application aims to ensure the high quality of the size and weight of fine-grained electrode sheets by measuring and storing the size and weight of the fine-grained electrode sheets after division using an electrode sheet measurement unit, thereby improving the accuracy of quality tracing of lithium electrode sheets to a certain extent.

[0023] In one selectable embodiment, the process of collecting data from the electrode sheet coating process and the measurement process is as follows: Using a laser coding identification device to identify the electrode sheet numbers marked by coding, and respectively obtaining the distances from the laser coding identification device to the coating mechanism, the CCD size measuring device, and the electrode sheet weight measuring device, and denoting them as a, b, and c respectively; Identifying the electrode sheet numbers of each ea electrode sheet marked by coding. When the laser coding identification device identifies the electrode sheet number of the first ea electrode sheet, recording the value of the belt meter at this time and denoting it as m; When the value of the belt meter becomes m + a, the coating mechanism starts coating the first row of coating target areas; When the value of the belt meter becomes m + b, the CCD size measuring device starts measuring the size of the first row of coating areas; When the value of the belt meter becomes m + c, the electrode sheet weight measuring device starts measuring the weight of the electrode sheet in the first row of coating areas; By analogy, for each of the remaining ea electrode sheets, perform the above identification, coating, and measurement processes, and collect the data of the coating process and measurement process of each ea electrode sheet.

[0024] This application sets specific coating and measurement rules, and ensures the normal execution of each process in the manufacturing of electrode sheets through the set specific numerical formulas.

[0025] In one selectable embodiment, the electrode sheet weight measuring device adopts a matrix type measurement method to measure the weight of the electrode sheet in the coating area.

[0026] By optimizing the weight measurement of the electrode sheet of this application to the matrix type measurement method, the weight measurement distribution of the electrode sheet is made more precise, and the situation where the weight measurement data is incomplete and there are blanks in the area data is avoided.

Brief Description of the Drawings

[0027] To more clearly describe the specific embodiments of this application or the technical concepts in the prior art, the following is a brief introduction of the drawings that may be used to describe the specific embodiments or the prior art. Clearly, the drawings in the following description are some embodiments of this application, and those skilled in the art can obtain further drawings based on these without any creative work.

[0028] [Figure 1] This is a structural block diagram of a quality traceability system for lithium electrode sheets according to an embodiment of this application. [Figure 2] This is a schematic diagram of the structure of another lithium electrode sheet quality traceability system according to an embodiment of this application. [Figure 3] This is a schematic diagram of the structure of yet another lithium electrode sheet quality traceability system according to an embodiment of the present application. [Figure 4] This is a flowchart of the quality traceability method for lithium electrode sheets according to an embodiment of this application. [Figure 5] This is a schematic diagram of the form database of the electrode sheet relating to the embodiment of this application. [Figure 6] This is a schematic diagram of the ea electrode sheet according to an embodiment of this application. [Modes for carrying out the invention]

[0029] To further clarify the purpose, technical proposal and advantages of the embodiments of this application, the technical proposal of the embodiments of this application will be clearly and completely described below with reference to the drawings of the embodiments of this application. Clearly, the embodiments described are some, but not all, embodiments of this application. All other embodiments that a person skilled in the art can obtain without creative effort based on the embodiments of this application are within the scope of protection of this application.

[0030] In conventional lithium electrode sheet quality tracing, the markings on electrode sheets for lithium batteries are not subdivided, so quality tracing of electrode sheet products is performed on a roll basis. Even after the entire roll of electrode sheets passes inspection and proceeds to the next process, some defective electrode sheets still remain, and with conventional methods, it is difficult to determine the specific location of the defective electrode sheets. If the entire roll of electrode sheets fails inspection, the entire roll of electrode sheets is discarded, but some good products still remain, resulting in excessive discarding of good products and waste. This application provides a lithium electrode sheet quality tracing system that physically divides the entire roll of electrode sheets and then combines it with the manufacturing execution system to realize subdivided markings and quality tracing of electrode sheets, enabling accurate distinction between good and defective electrode sheets, avoiding the situation where defective electrode sheets proceed to the next process and excessive discarding of good products, thereby making the statistics of good electrode sheet rates more accurate and making electrode sheet quality tracing more convenient and comprehensive.

[0031] A lithium electrode sheet quality traceability system according to an embodiment of this application, as shown in Figure 1, the system includes an electrode sheet splitting unit, a coating unit, an electrode sheet measuring unit, and a control unit. The electrode sheet splitting unit is used to physically split the lithium electrode sheet to be manufactured. The coating unit is used to identify and coat physically separated lithium electrode sheets. The electrode sheet measurement unit is used to measure coated lithium electrode sheets. The control unit controls the operation of the electrode sheet splitting unit, coating unit, and electrode sheet measurement unit, collects and stores data from the physical splitting process, coating process, and measurement process of the electrode sheet, and is used to trace the quality of the lithium electrode sheet based on the stored data.

[0032] Furthermore, the control unit employs a Manufacturing Execution System (MES). The Manufacturing Execution System (MES) is a manufacturing information management system designed for the operational layer of manufacturing companies. MES provides companies with management modules such as manufacturing data management, planning and scheduling, manufacturing schedule management, inventory management, quality control, human resource management, work center / equipment management, tool and fixture management, procurement management, cost management, project signage management, manufacturing process control, lower-level data integration and analysis, and higher-level data integration and analysis, creating a robust, reliable, comprehensive, and practical manufacturing collaboration management platform for businesses.

[0033] In this embodiment, an MES system is used to monitor and manage each process of the lithium electrode sheet, and in combination with an electrode sheet splitting unit, a coating unit, and an electrode sheet measurement unit, it assists in completing quality traceability of the lithium electrode sheet. Specifically, by performing fine-grained physical splitting on the entire roll of electrode sheet and combining it with the MES system, it is possible to refine the marking of the electrode sheet and trace its quality, accurately distinguishing between good and defective electrode sheets, avoiding situations where defective electrode sheets flow to later processes and good ones are excessively discarded, thereby making the statistics on the good electrode sheet rate more accurate and making quality traceability of the electrode sheet more convenient and comprehensive.

[0034] As shown in Figure 2, in this embodiment, the electrode sheet splitting unit includes an unwinding mechanism 1, a belt meter 2, a laser coding mechanism 3, and a winding mechanism 7. The lithium electrode sheet to be manufactured is unwinded by the unwinding mechanism 1, passes sequentially through the belt meter 2 and the laser coding mechanism 3, and is wound up by the winding mechanism 7. All devices mentioned in relation to the electrode sheet splitting unit, such as the unwinding mechanism 1 and the winding mechanism 7, belong to the category of common devices used by those skilled in the art, and their functions are all commonly used. For example, the unwinding mechanism 1 is one of the main mechanisms of a belt winding machine, and its main function is to uniformly pull the belt from the material reel with constant tension. The specific functions of the above devices are not specifically limited here, and their connection relationships are determined based on the process flow of the electrode sheet, with each device being connected sequentially via the electrode sheet. Specifically, the interaction of each device in the electrode sheet splitting unit enables fine-grained physical splitting of the lithium electrode sheet across the entire roll, and further, in combination with the MES system, enables more accurate quality tracing of the lithium electrode sheet.

[0035] As shown in Figure 3, in this embodiment, the coating unit includes a laser coding identification device 8 and a coating mechanism 4. Here, the laser coding identification device 8 is used to identify the electrode sheet number, and the coating mechanism 4 is used to manufacture the lithium electrode sheet to be manufactured by coating it. The electrode sheet measurement unit includes a CCD size measuring instrument 5 and an electrode sheet weight measuring instrument 6. Here, the CCD size measuring instrument 5 is used to measure the size and position of the coated area on the electrode sheet, thereby the electrode sheet weight measuring instrument 6 is used to measure the weight of the electrode sheet, thereby providing feedback on the surface density data of the electrode sheet. The formal English name for CCD is Charge coupled Device, that is, a charge-coupled element, and it may also be called a CCD image sensor. A CCD is a semiconductor device that can convert optical images into digital signals. The CCD size measuring instrument 5 is mainly used to comprehensively detect elements such as the length, width, and height of the battery module. In this embodiment, the connection relationships of the laser coding identification device 8, the coating mechanism 4, the CCD size measuring instrument 5, and the electrode sheet weight measuring instrument 6 are also determined based on the electrode sheet process flow, and the above devices are connected via the electrode sheet. Specifically, by measuring the size and weight of the finely granulated electrode sheets after division using the electrode sheet measurement unit, it contributes to improving quality and, to some extent, enhances the accuracy of quality tracing for lithium electrode sheets.

[0036] According to embodiments of this application, a method for performing quality retrospective testing of an electrode sheet using the lithium electrode sheet quality retrospective system described above is provided, and as shown in Figure 4, the method includes the following steps: Step S101: Obtain the electrode sheet number of the lithium electrode sheet to be manufactured, and establish a form database for the electrode sheet based on the electrode sheet number.

[0037] In step S102, based on the form database of the electrode sheet, the lithium electrode sheet to be manufactured is physically divided, and data on the physical division process of the electrode sheet is obtained.

[0038] In step S103, the physically separated lithium electrode sheets are coated and measured, and data from the coating and measurement processes of the electrode sheets are obtained.

[0039] In step S104, the electrode sheet number, the form database of the electrode sheet, data on the physical division process of the electrode sheet, and data on the coating and measurement processes are stored, and the quality of the lithium electrode sheet is traced based on the stored data.

[0040] This application describes a method for physically dividing lithium electrode sheets to be manufactured based on a form database of ea electrode sheets, and then combining this with an MES system to achieve detailed marking and quality traceability of the electrode sheets. An ea electrode sheet is the smallest electrode sheet unit after physical division, referring to an electrode sheet for manufacturing a single battery cell in the case of a roll-type battery cell, and a single stacked electrode sheet in the case of a stacked cell. Through a comprehensive database dedicated to each ea electrode sheet, adjustment reference data can be provided for pre-adjustment of downstream manufacturing processes. Furthermore, good and defective electrode sheets can be accurately distinguished, preventing situations where defective electrode sheets flow to later processes and good ones are excessively discarded. This results in more accurate statistics on the good electrode sheet rate and makes electrode sheet quality traceability more convenient and comprehensive.

[0041] Specifically, the process of obtaining the electrode sheet number of the lithium electrode sheet to be manufactured in step S101 above includes the steps of inputting the order information of the lithium electrode sheet to be manufactured into the MES system, coding the lithium electrode sheet to be manufactured in combination with a pre-set coding rule, and obtaining the electrode sheet number of the lithium electrode sheet to be manufactured. For example, the pre-set coding rule may be in the form of date + sequential number, but this is merely an example for illustrative purposes and is not limited to this, and will be adaptively adjusted according to the actual application needs. This embodiment allows for accurate understanding of the specific status of the electrode sheet and the quality traceability status corresponding to the electrode sheet number by coding the electrode sheet of the lithium electrode sheet, and has the advantages of being fast, convenient, and highly accurate in tracking the quality of electrode sheets.

[0042] In this embodiment, the process of establishing a form database for the ea electrode sheet based on the electrode sheet number includes the steps of obtaining relevant data for each process in the manufacturing of the corresponding electrode sheet based on the electrode sheet number, and establishing a form database for the ea electrode sheet based on the relevant data. The relevant data includes the order number, coating batch, slurry batch, date, time, slurry mixing equipment parameters, equipment parameters in the coating process, initial product detection data, and data from the manufacturing process of the electrode sheet, corresponding to the electrode sheet number. See Figure 5 for the form database for the ea electrode sheet. Furthermore, the slurry mixing equipment parameters stored in the ea electrode sheet form database include parameters such as slurry temperature and viscosity. Equipment parameters in the coating process include coating process parameters, coating parameters, data on the leading and trailing products being coated, the size of the electrode sheet during the coating process, the weight of the electrode sheet during the coating process, and parameters for detecting coating defects. These also include parameters such as data on the leading and trailing products being roll-rolled, the thickness of the electrode sheet during the roll-rolling process, the arc height of the roll-rolled electrode sheet, and data on the leading and trailing products being die-cut. These are merely examples given for illustrative purposes, and the number and types of parameters are not specifically limited and will be adjusted according to actual application needs. Specifically, by storing important data related to the manufacturing process of the ea electrode sheet through the ea electrode sheet form database, it contributes to rapidly achieving fine-grained quality traceability for the electrode sheet.

[0043] Specifically, the process of physically dividing the lithium electrode sheet to be manufactured in step S102 above includes the step of an electrode sheet dividing unit, under the control of the MES system, marking the electrode sheet in units of ea, employing a physical laser coding and marking method, and physically dividing the lithium electrode sheet to be manufactured based on a form database of ea electrode sheets. This process includes the step of using the laser coding mechanism 3 to code and mark the lithium electrode sheet to be manufactured based on the electrode sheet number of the lithium electrode sheet to be manufactured, thereby realizing the physical division of the lithium electrode sheet to be manufactured by demarcating the position of each ea electrode sheet. In this embodiment, marking the electrode sheet in units of ea and the electrode sheet dividing unit realizes fine-grained physical division of the lithium electrode sheet across the entire roll, contributing to more accurate quality tracing of the lithium electrode sheet.

[0044] In this embodiment, after the physical division of the lithium electrode sheet to be manufactured is completed, each ea electrode sheet is coated using the coating mechanism 4. After the coating of each ea electrode sheet is completed, the size is measured using the CCD size measuring instrument 5, and the weight is measured using the electrode sheet weight measuring instrument 6. The size data and weight data of each coated ea electrode sheet are then input into the MES system and stored. Specifically, by measuring and storing the size and weight of the fine-grained electrode sheets after division using the electrode sheet measuring unit, the high quality of the size and weight of the fine-grained electrode sheets is ensured, and the accuracy of quality tracing of the lithium electrode sheets is improved to some extent.

[0045] Specifically, the process of collecting data from the electrode sheet coating process and measurement process in step 103 above is: Step a1 involves using the laser coding identification device 8 to identify the number of the coded and marked electrode sheet, obtaining the distances from the laser coding identification device 8 to the coating mechanism 4, the CCD size measuring device 5, and the electrode sheet weight measuring device 6, and labeling them a, b, and c, respectively. Step a2 involves identifying the electrode sheet number of each coded and marked ea electrode sheet, and if the laser coding identification device 8 detects the electrode sheet number of the first ea electrode sheet, recording the value of the belt meter 2 at this point and writing it as m. When the value of the belt meter 2 reaches m+a, the coating mechanism 4 begins coating the first line of the target area in step a3, Step a4 is when the value of the belt meter 2 reaches m+b, and the CCD size measuring device 5 starts measuring the size of the first coated area. Step a5 is when the value of the belt meter 2 reaches m+c, and the electrode sheet weight measuring device 6 starts measuring the weight of the electrode sheet in the first coated area. By analogy, the above identification, coating, and measurement processes are performed on each of the remaining ea electrode sheets, and step a6 includes collecting data on the coating and measurement processes for each ea electrode sheet.

[0046] This embodiment ensures the normal execution of each process in the manufacturing of electrode sheets by establishing specific coating and measurement rules. The order of each step in the above process is not specifically limited and will be determined according to the actual application needs.

[0047] In this embodiment, the electrode sheet weight measuring device 6 employs a matrix-type measurement method to measure the weight of the electrode sheet in the coated area. Specifically, by optimizing the electrode sheet weight measurement to a matrix-type measurement method, the distribution of electrode sheet weight measurements is made more precise, and situations where weight measurement data is incomplete and there are gaps in the area data are avoided.

[0048] In one specific embodiment, the process of performing a quality trace on a lithium electrode sheet based on a quality trace system and method further includes the following steps:

[0049] Step 1: The MES system performs coding. Order information for the lithium electrode sheets to be manufactured is entered into the MES system. Based on the order information, the MES system assigns a product code to the electrode sheets to be manufactured according to the electrode sheet number. The assigned electrode sheet numbers are used throughout the entire manufacturing lifecycle of the electrode sheets.

[0050] Step 2: Establish a form database for the ea electrode sheets. The MES system establishes a form database for the ea electrode sheets based on the following: type corresponding to the electrode sheet number, slurry batch, coating batch, coating process parameters, coating parameters, data on the first and last products to be coated, size of the electrode sheet during the coating process, weight of the electrode sheet during the coating process, detection of coating defects, data on the first and last products to be roll-rolled, thickness of the electrode sheet during the roll-rolling process, arc height of the electrode sheet during roll-rolling, and data on the first and last products to be die-cut.

[0051] Step 3: Laser coding. Referring to Figure 2, this step requires an unwinding mechanism 1, a belt meter 2, a laser coding mechanism 3, a winding mechanism 7, and an MES system. The substrate to be manufactured according to the order is placed in the unwinding mechanism 1, and the substrate is passed through the equipment's belt transport path. The MES system transmits the number of the electrode sheet to be manufactured to the laser coding mechanism 3. The equipment is started, the unwinding mechanism 1 unwinds, the winding mechanism 7 winds, and the substrate is transported at the equipment's set speed. The laser coding mechanism 3 begins coding according to the instructions of the MES system. Simultaneously with coding, the belt meter 2 begins recording the length of the substrate in the longitudinal direction. Once the substrate has been transported a certain distance, the laser coding mechanism 3 codes again. In this way, the physical division of the electrode sheet in the longitudinal direction of the substrate is completed. The winding mechanism 7 winds up the substrate after coding is complete. Here, the coating positions are located on both sides of the coating area of ​​the substrate, and as shown in Figure 6, two sheets are coated, and each sheet is slit laterally into two electrode sheets, which are then made to correspond to two laser codes.

[0052] Specifically, the substrate of the lithium electrode sheet to be traced is placed in the unwinding mechanism 1, and the belt is passed through the winding mechanism 7 along the direction of the intermediate roller. After the belt has passed through, the equipment transports the belt. The belt meter 2 begins recording the length in meters, and at the same time, the MES system transmits the number of the arranged electrode sheets to the laser coding mechanism 3. When the belt transfer is paused at the position of the laser coding mechanism 3, it begins assigning the first code according to the coding order. After the laser coding mechanism 3 assigns the first code, the equipment continues transporting the belt, and the belt meter 2 records the length in meters. When the value obtained by subtracting the length of meters when the laser coding mechanism 3 paused from the length of meters recorded by the belt meter 2 reaches the length of 1ea electrode sheet, the laser coding mechanism 3 assigns the second code. When the laser coding mechanism 3 pauses after assigning a code, the belt meter 2 records the current length in meters again. When the value obtained by subtracting the length of meters when the laser coding mechanism 3 paused from the length of meters recorded by the belt meter 2 reaches the length of 1ea electrode sheet again, the laser coding mechanism 3 assigns the third code. This process continues until the substrate is transported by the belt, that is, until the laser coating of the entire roll is complete.

[0053] Step 4 involves coating and measurement. The coating mechanism 4 uses a belt-pass substrate and passes it along the belt according to the belt transport diagram. After that, the substrate marked by laser coding in Step 3 is placed in the unwinding mechanism 1 and connected to the belt-pass substrate. The coating mechanism 4 then moves along the belt, and simultaneously the belt meter 2 begins recording the meterage, and the laser coding identification device 8 begins identifying the codes applied by the laser. The belt meter 2 and the laser coding identification device 8 jointly position the Y-axis position of the substrate. The coating mechanism 4 begins coating, the CCD size measuring instrument 5 begins measuring the size of the electrode sheet, the electrode sheet weight measuring instrument 6 begins measuring the weight of each electrode sheet, the winding mechanism 7 begins winding, and the MES system collects data of the electrode sheet manufacturing process in real time along the time axis.

[0054] In step 4, after the coating mechanism 4 has coated the first ea electrode sheet, the CCD size measuring instrument 5 measures the size and defects of the coated first ea electrode sheet and synchronizes it with the Y-axis data. The MES system then records and stores the X-axis defect data of the first ea electrode sheet. The coating mechanism 4 coats the second ea electrode sheet, and then repeats the above process until the coating of the entire film roll is complete. After the coating mechanism 4 has coated the first ea electrode sheet and measured its size and defects, the electrode sheet weight measuring instrument 6 measures the weight of the coated first ea electrode sheet and synchronizes it with the Y-axis and X-axis data (the Y-axis direction is the belt conveying direction, and the X-axis direction is the up and down direction of the belt conveying). The MES system then records and stores the weight data of the first ea electrode sheet. The coating mechanism 4 coats the second ea electrode sheet, and then repeats the above process until the coating of the entire film roll is complete.

[0055] In this embodiment, the MES system records and stores weight data and size data, as well as equipment parameters during the manufacturing of the electrode sheet. The MES system may also store data from other processes related to the processing and manufacturing of the electrode sheet.

[0056] Step 5: Perform a quality trace. The MES system provides a query window that allows you to query the quality of electrode sheets based on date, time, batch number, electrode sheet number, weight data, size data, and instrument parameters.

[0057] Furthermore, the lithium electrode sheet quality traceability system and method of the embodiment of this application may also be applied to other fields besides lithium battery electrode sheets, where accurate identification of good and defective products and quality traceability are difficult for other roll materials. As described above, the lithium electrode sheet quality traceability method according to the embodiment of this application obtains each electrode sheet by dividing the electrode sheet of the entire roll, binds the relevant quality data to each electrode sheet, uploads it to the MES system for storage, and shares the data in subsequent processes. As a result, the electrode sheet can be retrieved simply by identifying the mark on the electrode sheet, allowing for more accurate distinction between good and defective products. This effectively prevents situations where defective electrode sheets flow to subsequent processes and good products are excessively discarded, thereby making the statistics of the good product rate of electrode sheets more accurate and making quality traceability of electrode sheets more convenient and comprehensive.

[0058] Clearly, the above embodiments are merely examples to clarify the description and do not limit the embodiments. Those skilled in the art can make various other forms of changes or modifications based on the above description. It is neither necessary nor possible to comprehensively list all embodiments here. Any obvious changes or modifications derived therefrom are also within the scope of protection of this application.

Claims

1. A quality traceability system for lithium electrode sheets, wherein the system is Includes an electrode sheet splitting unit, a coating unit, an electrode sheet measuring unit, and a control unit. The electrode sheet splitting unit is used to physically split the lithium electrode sheet to be manufactured. The coating unit is used to identify and coat physically separated lithium electrode sheets. The electrode sheet measurement unit is used to measure the coated lithium electrode sheet. A lithium electrode sheet quality traceability system characterized in that the control unit controls the operation of the electrode sheet splitting unit, the coating unit, and the electrode sheet measurement unit, collects and stores data on the physical splitting process, coating process, and measurement process of the electrode sheet, and is used to trace the quality of the lithium electrode sheet based on the stored data.

2. The lithium electrode sheet quality traceability system according to claim 1, wherein the electrode sheet splitting unit includes an unwinding mechanism, a belt meter, a laser coding mechanism, and a winding mechanism, and the lithium electrode sheet to be manufactured is unwinded by the unwinding mechanism, passes sequentially through the belt meter and the laser coding mechanism, and is wound up by the winding mechanism.

3. The lithium electrode sheet quality traceability system according to claim 1, characterized in that the coating unit includes a laser coding identification device and a coating mechanism, the laser coding identification device being used to identify the electrode sheet number, the coating mechanism being used to coat and manufacture the lithium electrode sheet to be manufactured, and the electrode sheet measuring unit including a CCD size measuring device and an electrode sheet weight measuring device, the CCD size measuring device being used to measure the size and position of the coated area on the electrode sheet, and the electrode sheet weight measuring device being used to measure the weight of the electrode sheet and thereby to feed back the surface density data of the electrode sheet.

4. A method for performing quality traceability using the quality traceability system for lithium electrode sheets described in any one of claims 1 to 3, wherein the method is: The steps include obtaining the electrode sheet number of the lithium electrode sheet to be manufactured, and establishing a form database of the ea electrode sheet based on the electrode sheet number, The process involves physically dividing the lithium electrode sheet to be manufactured based on the form database of the EA electrode sheet, and obtaining data on the physical division process of the electrode sheet. The steps include: coating and measuring physically separated lithium electrode sheets, and acquiring data on the coating and measurement processes of the electrode sheets; A method for tracing the quality of a lithium electrode sheet, characterized by including the steps of storing an electrode sheet number, a form database of the ea electrode sheet, data on the physical division process of the electrode sheet, and data on the coating process and measurement process, and performing quality tracing of the lithium electrode sheet based on the stored data.

5. The lithium electrode sheet quality traceability method according to claim 4, characterized in that the process of obtaining the electrode sheet number of the lithium electrode sheet to be manufactured includes the steps of inputting order information of the lithium electrode sheet to be manufactured into a control unit, coding the lithium electrode sheet to be manufactured in combination with a pre-set coding rule, and obtaining the electrode sheet number of the lithium electrode sheet to be manufactured.

6. The process of establishing a form database of ea electrode sheets based on the electrode sheet number includes the step of obtaining relevant data for each process in the manufacturing of the corresponding electrode sheet based on the electrode sheet number, and establishing a form database of ea electrode sheets based on the relevant data, wherein the relevant data includes an order number, coating batch, slurry batch, date, time, slurry mixing equipment parameters, equipment parameters in the coating process, initial product detection data, and data from the manufacturing process of the electrode sheet, as described in claim 4.

7. The lithium electrode sheet quality traceability method according to claim 4, characterized in that, under the control of a control unit, the electrode sheet splitting unit marks the electrode sheets in units of ea, employs a physical laser coding marking method, and the process of physically splitting the lithium electrode sheets to be manufactured based on a form database of ea electrode sheets includes the step of using a laser coding mechanism to code and mark the lithium electrode sheets to be manufactured based on the electrode sheet number of the lithium electrode sheets to be manufactured, thereby realizing the physical splitting of the lithium electrode sheets to be manufactured by demarcating the position of each ea electrode sheet.

8. The lithium electrode sheet quality traceability method according to claim 7, characterized in that, after the physical division of the lithium electrode sheet to be manufactured is completed, each ea electrode sheet is coated using a coating mechanism, after the coating of each ea electrode sheet is completed, the size is measured using a CCD size measuring device and the weight is measured using an electrode sheet weight measuring device, and the size and weight data of each ea electrode sheet after coating are input to and stored in a control unit.

9. The process of collecting data from the electrode sheet coating process and measurement process is as follows: The process involves using a laser coding identification device to identify the number of the coded and marked electrode sheet, obtaining the distances from the laser coding identification device to the coating mechanism, the CCD size measuring device, and the electrode sheet weight measuring device, and labeling them a, b, and c, respectively. The laser coding identification device identifies the electrode sheet number of each coded and marked EA electrode sheet, and when it identifies the electrode sheet number of the first EA electrode sheet, it records the value of the belt meter at this point and writes it as m. When the belt meter value reaches m+a, the coating mechanism performs the step of starting coating the first line of the area to be coated, When the belt meter reading reaches m+b, the CCD size measuring device begins measuring the size of the first coated area. When the belt meter reading reaches m+c, the electrode sheet weight measuring device begins measuring the weight of the electrode sheet in the first coated area, The lithium electrode sheet quality traceability method according to claim 8, characterized in that, by analogy, the above-mentioned identification, coating, and measurement processes are performed on each of the remaining ea electrode sheets, and data from the coating and measurement processes of each ea electrode sheet are collected.

10. The method for determining the quality of a lithium electrode sheet according to claim 8, characterized in that the electrode sheet weight measuring device employs a matrix-type measurement method to measure the weight of the electrode sheet in the coated area.

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