Quality tracing system and method for lithium electrode sheet

Abstract

A quality tracing system and method for a lithium electrode sheet. The system comprises: an electrode sheet segmentation unit, a coating unit, an electrode sheet measurement unit and a control unit, wherein the electrode sheet segmentation unit is used for performing physical segmentation on a lithium electrode sheet to be produced; the coating unit is used for identifying and coating the lithium electrode sheet which has been subjected to the physical segmentation; the electrode sheet measurement unit is used for measuring the coated lithium electrode sheet; and the control unit is used for controlling the electrode sheet segmentation unit, the coating unit and the electrode sheet measurement unit to operate, collecting data during a physical segmentation process, a coating process and a measurement process of the electrode sheet and storing the data, and performing quality tracing on the lithium electrode sheet according to the stored data. Therefore, good products and defective products in lithium electrode sheets can be accurately distinguished, thereby avoiding the phenomenon in which the defective products in the lithium electrode sheets flow to subsequent procedures and the good products are overly filtered out and scrapped, and making the statistics on the yield of the lithium electrode sheets more accurate, and the quality tracing of the lithium electrode sheets more convenient and comprehensive.

Description

A lithium electrode sheet quality tracing system and method

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on June 30, 2023, with application number 202310799413.X and entitled “A system and method for tracing quality of lithium electrode sheets,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of quality tracing, and in particular to a lithium electrode sheet quality tracing system and method. Background Art

[0003] The electronic information age of Industry 3.0 has further greatly improved the manufacturing process and the degree of automated control. However, it can no longer meet the current needs of technological development. Therefore, we have entered the era of Industry 4.0, which aims to develop a new production model, that is, to integrate the physical world with the virtual network world, to carry out refined management of the entire product life cycle, to achieve full digitalization of the manufacturing process and a high degree of integration of information and communication technologies.

[0004] Lithium battery is a green battery with excellent performance. It is composed of electrode plates, diaphragms and electrolytes. The electrode plates are the core components and important parts of lithium batteries. The electrodes have visual defects such as creases, damage, missing prints or breakage. These defects will not only greatly reduce the service life of lithium batteries, but also may bring great safety hazards during use. Therefore, the inspection of electrodes in the production process is particularly important. It is an important means to ensure the performance reliability of electronic products.

[0005] However, the current production process of lithium battery coated electrodes is to coat multiple sheets at the same time, the weight measurement data of the electrode production process is incomplete, and there are regional data gaps; in addition, the electrode markings are not refined, and the quality traceability of the electrode products is based on the roll. When the entire roll of electrodes passes the overall inspection, it is considered that the entire roll meets the requirements and then proceeds to the subsequent process, but there are still unqualified sheets, which affect the subsequent processes. That is, when the electrode quality is abnormal, it is difficult to determine the specific location of the abnormal electrode, resulting in difficulty in tracing the quality of the electrode; when the entire roll of electrodes fails the overall inspection, it is considered that the entire roll of electrodes does not meet the requirements, and the entire roll of electrodes is scrapped, but there are still qualified sheets, resulting in over-killing of good products, wasting electrodes and increasing production costs.

[0006] Summary of the Invention

[0007] In view of this, the present application provides a lithium electrode sheet quality tracing system and method, which realizes the refinement of electrode sheet marking and quality tracing by physically dividing the entire roll of electrode sheets and combining it with the production execution system; it can accurately distinguish between good and bad electrode sheets, avoid the bad electrode sheets from flowing to subsequent processes and the good electrode sheets from being over-killed and scrapped, make the electrode sheet quality statistics more accurate, and make the electrode sheet quality tracing more convenient and comprehensive, so as to solve the technical problems raised in the above background.

[0008] In a first aspect, the present application provides a lithium electrode sheet quality traceability system, the system comprising:

[0009] Pole piece segmentation unit, coating unit, pole piece measurement unit and control unit;

[0010] Among them, the electrode segmentation unit is used to physically segment the lithium electrode sheets to be produced;

[0011] A coating unit, used to identify and coat the physically segmented lithium electrode sheets;

[0012] Pole piece measuring unit, used to measure the coated lithium electrode piece;

[0013] The control unit is used to control the operation of the electrode segmentation unit, coating unit and electrode measurement unit, collect and store data of the electrode physical segmentation process, coating process and measurement process, and trace the quality of the lithium electrode sheet based on the stored data.

[0014] The lithium electrode sheet quality traceability system of the present application realizes the refinement of the electrode sheet marking and quality traceability by performing fine-grained physical segmentation of the entire roll of electrodes. It can accurately distinguish between good and bad electrodes, avoid the phenomenon of bad electrodes flowing to subsequent processes and good electrodes being over-killed and scrapped, making the statistics of the electrode quality rate more accurate and the electrode quality traceability more convenient and comprehensive.

[0015] In an optional embodiment, the electrode segmentation unit includes: an unwinding mechanism, a tape meter, a laser coding mechanism and a rewinding mechanism. The lithium electrode sheet to be produced is unwound by the unwinding mechanism, passes through the tape meter and the laser coding mechanism in sequence, and is rewound by the rewinding mechanism.

[0016] This application uses the electrode segmentation unit to achieve fine-grained physical segmentation of the entire coil of lithium electrode sheets, which helps to achieve more accurate quality traceability of lithium electrode sheets.

[0017] In an optional embodiment, the coating unit includes: a laser coding identifier and a coating mechanism, wherein the laser coding identifier is used to identify the pole piece number, and the coating mechanism is used to coat the lithium electrode piece to be produced; the pole piece measuring unit includes: a CCD size measuring device and a pole piece weight measuring device, wherein the CCD size measuring device is used to measure the size and position of the coating area on the pole piece, and the pole piece weight measuring device is used to measure the weight of the pole piece, and then feedback the surface density data of the pole piece.

[0018] This application uses a pole piece measurement unit to measure the size and weight of the fine-grained pole pieces after segmentation, which helps to improve the quality of the pole pieces and to a certain extent improves the accuracy of lithium electrode piece quality traceability.

[0019] In a second aspect, the present application provides a lithium electrode sheet quality tracing method, which uses the lithium electrode sheet quality tracing system according to the first aspect to perform quality tracing, and the method includes:

[0020] Obtain the electrode number of the lithium electrode to be produced, and establish an EA electrode form database based on the electrode number;

[0021] Based on the EA electrode sheet database, the lithium electrode sheets to be produced are physically segmented and the data of the electrode sheet physical segmentation process is obtained;

[0022] Coating and measuring the physically divided lithium electrode sheets, and obtaining data on the electrode coating and measurement processes;

[0023] The electrode number, EA electrode form database, data of the electrode physical segmentation process, and data of the coating process and measurement process are stored, and the quality of the lithium electrode is traced based on the stored data.

[0024] This application realizes the refinement of electrode marking and quality traceability after physical segmentation of the lithium electrode sheets to be produced based on the EA electrode form database; through the exclusive and comprehensive database of each EA electrode, adjustment reference data can be provided for the pre-adjustment of downstream production processes; in addition, it can also accurately distinguish between good and bad electrodes, avoiding the phenomenon of bad electrodes flowing to subsequent processes and good electrodes being over-killed and scrapped. The statistics of the electrode quality rate are more accurate, and the quality traceability of the electrodes is more convenient and comprehensive.

[0025] In an optional embodiment, the process of obtaining the electrode plate number of the lithium electrode plate to be produced includes: inputting the order information of the lithium electrode plate to be produced into the control unit, and encoding the lithium electrode plate to be produced in combination with the preset coding rules to obtain the electrode plate number of the lithium electrode plate to be produced.

[0026] By numbering the pole pieces of lithium electrode sheets, this application can accurately know the specific conditions of the pole pieces and the quality traceability corresponding to the pole piece numbers, which has the advantages of fast, convenient and accurate quality traceability of the pole pieces.

[0027] In an optional embodiment, the process of establishing an EA electrode form database based on the electrode number includes: obtaining relevant data of each electrode production process according to the electrode number, and establishing an EA electrode form database based on the relevant data. The relevant data include: the order number corresponding to the electrode number, coating batch, slurry batch, date, time, slurry stirring equipment parameters, coating process equipment parameters, first-piece inspection data and electrode production process data.

[0028] This application uses the EA electrode form database to store key data involved in the EA electrode production process, which helps to quickly achieve fine-grained quality traceability of the electrode.

[0029] In an optional embodiment, under the control of the control unit, the electrode segmentation unit marks the electrode piece ea as a unit, adopts a physical laser coding marking method, and physically divides the lithium electrode piece to be produced based on the ea electrode piece form database. The process includes using a laser coding mechanism to code and mark the lithium electrode piece to be produced according to the electrode piece number of the lithium electrode piece to be produced, and dividing the position of each ea electrode piece to realize the physical division of the lithium electrode piece to be produced.

[0030] This application marks the electrode sheet in units of ea under the control of the production execution system, and realizes the fine-grained physical division of the entire roll of lithium electrode sheet through the electrode segmentation unit, which helps to trace the quality of lithium electrode sheet more accurately.

[0031] In an optional embodiment, after the physical segmentation of the lithium electrode sheets to be produced is completed, a coating mechanism is used to coat each EA electrode sheet; after each EA electrode sheet is coated, a CCD size measuring device is used to measure the size and an electrode sheet weight measuring device is used to measure the weight, and the size and weight data of each coated EA electrode sheet are input into the control unit for storage.

[0032] This application measures and stores the size and weight of the segmented fine-grained electrode sheets through an electrode sheet measurement unit, thereby ensuring the high quality of the size and weight of the fine-grained electrode sheets and improving the accuracy of lithium electrode sheet quality traceability to a certain extent.

[0033] In an optional embodiment, the process of collecting data of the electrode coating process and the measurement process includes:

[0034] A laser code reader is used to identify the electrode number marked with the code, and the distances from the laser code reader to the coating mechanism, the CCD size measuring device, and the electrode weight measuring device are obtained and recorded as a, b, and c respectively;

[0035] Identify the pole piece number of each EA pole piece marked with the coding mark. When the laser coding identifier recognizes the pole piece number of the first EA pole piece, record the value of the tape meter at this time, which is recorded as m;

[0036] When the value of the tape meter is m+a, the coating identifier starts coating the area to be coated in the first row;

[0037] When the value of the tape meter is m+b, the CCD size measuring device starts to measure the size of the coating area of ​​the first row;

[0038] When the value of the tape meter is m+c, the pole piece weight measuring device starts to measure the pole piece weight of the coating area of ​​the first row;

[0039] Similarly, the above identification, coating and measurement processes are carried out on the remaining EA pole pieces, and the data of the coating and measurement processes of each EA pole piece are collected.

[0040] This application sets specific coating and measurement rules, and ensures the normal execution of each electrode production process through the set specific numerical formulas.

[0041] In an optional embodiment, the pole piece weight measuring device uses a matrix measurement method to measure the pole piece weight of the coating area.

[0042] The pole piece weight measurement of the present application is optimized into a matrix measurement method, which makes the pole piece weight measurement distribution more precise, avoids the phenomenon of incomplete weight measurement data and regional data gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] FIG1 is a structural block diagram of a lithium electrode sheet quality tracing system according to an embodiment of the present application;

[0045] FIG2 is a schematic structural diagram of another lithium electrode sheet quality tracing system according to an embodiment of the present application;

[0046] FIG3 is a schematic structural diagram of another lithium electrode sheet quality tracing system according to an embodiment of the present application;

[0047] FIG4 is a schematic flow chart of a lithium electrode sheet quality tracing method according to an embodiment of the present application;

[0048] FIG5 is a schematic diagram of the EA pole piece table database of an embodiment of the present application;

[0049] Figure 6 is a schematic diagram of the ea electrode of an embodiment of the present application. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0051] In the existing quality traceability of lithium electrode sheets, since the electrode markings of lithium-coated electrodes are not refined, the quality traceability of electrode products is based on rolls. When the entire roll of electrodes passes the inspection and flows into the subsequent process, but there are still unqualified sheets in it, the existing solution is difficult to determine the specific location of the abnormal electrode; when the entire roll of electrodes fails the inspection, the entire roll of electrodes is scrapped, but there are still qualified sheets in it, resulting in over-killing and waste of good products. The present application provides a lithium electrode sheet quality traceability system, which realizes the refinement of electrode markings and quality traceability by physically dividing the entire roll of electrodes and combining it with the production execution system; it can accurately distinguish between good and bad electrodes, avoiding the phenomenon of bad electrodes flowing to subsequent processes and good electrodes being over-killed and scrapped, and the statistics of electrode quality are more accurate, and the quality traceability of electrodes is more convenient and comprehensive.

[0052] A lithium electrode sheet quality tracing system according to an embodiment of the present application is shown in FIG1 . The system includes: an electrode sheet segmentation unit, a coating unit, an electrode sheet measurement unit, and a control unit.

[0053] Among them, the electrode segmentation unit is used to physically segment the lithium electrode sheets to be produced;

[0054] A coating unit, used to identify and coat the physically segmented lithium electrode sheets;

[0055] Pole piece measuring unit, used to measure the coated lithium electrode piece;

[0056] The control unit is used to control the operation of the electrode segmentation unit, coating unit and electrode measurement unit, collect and store data of the electrode physical segmentation process, coating process and measurement process, and trace the quality of the lithium electrode sheet based on the stored data.

[0057] It should be noted that the control unit uses a production execution system. The Manufacturing Execution System (MES) is a production information management system for the execution layer of manufacturing companies' workshops. MES can provide companies with management modules including manufacturing data management, planning and scheduling management, production scheduling management, inventory management, quality management, human resources management, work center / equipment management, tool and fixture management, procurement management, cost management, project kanban management, production process control, bottom-level data integration and analysis, and top-level data integration and decomposition, creating a solid, reliable, comprehensive, and feasible manufacturing collaborative management platform for companies.

[0058] In this embodiment, the MES system is used to monitor and manage the various processes of the lithium electrode sheet. In combination with the electrode segmentation unit, coating unit, and electrode measurement unit, it assists in completing the quality traceability of the lithium electrode sheet. Specifically, by performing fine-grained physical segmentation on the entire roll of electrode sheets and combining it with the MES system, the electrode sheet marking is refined and the quality traceability is achieved. It can accurately distinguish between good and bad electrode sheets, avoiding the phenomenon of bad electrode sheets flowing to subsequent processes and good electrode sheets being over-killed and scrapped. The statistics of the electrode quality rate are more accurate, and the quality traceability of the electrode sheets is more convenient and comprehensive.

[0059] As shown in Figure 2, in this embodiment, the electrode segmentation unit includes: an unwinding mechanism 1, a tape meter 2, a laser coding mechanism 3 and a rewinding mechanism 7. The lithium electrode sheet to be produced is unwound by the unwinding mechanism 1, passes through the tape meter 2 and the laser coding mechanism 3 in sequence, and is rewound by the rewinding mechanism 7. It should be noted that all the devices such as the unwinding mechanism 1 and the rewinding mechanism 7 mentioned in the electrode segmentation unit are conventional devices used by people in this field, and their functions are all commonly used functions. For example, the unwinding mechanism 1 is one of the main mechanisms of the strip winding machine. Its main function is to pull the strip out evenly from the material tray with a certain tension. The specific functions of the above-mentioned devices are not specifically limited here. Their connection relationship is determined based on the process flow of the electrode, and each device is connected in sequence through the electrode. Specifically, through the interaction of the various devices in the electrode segmentation unit, the fine-grained physical segmentation of the entire coil of the lithium electrode sheet is achieved. Combined with the MES system, more accurate quality traceability of the lithium electrode sheet is achieved.

[0060] As shown in Figure 3, in this embodiment, the coating unit includes a laser code reader 8 and a coating mechanism 4. The laser code reader 8 is used to identify the electrode number, and the coating mechanism 4 is used to coat the lithium electrode to be produced. The electrode measurement unit includes a CCD size measuring device 5 and an electrode weight measuring device 6. The CCD size measuring device 5 is used to measure the size and position of the coated area on the electrode, and the electrode weight measuring device 6 is used to measure the weight of the electrode, thereby providing feedback on the electrode surface density data. It should be noted that CCD stands for Charge Coupled Device, also known as CCD image sensor. A CCD is a semiconductor device that converts optical images into digital signals. The CCD size measuring device 5 is primarily used to comprehensively detect the length, width, height, and other elements of the battery module. In this embodiment, the connection relationship between the laser code reader 8, coating mechanism 4, CCD size measuring device 5, and electrode weight measuring device 6 is also determined based on the electrode process flow, and the above devices are connected accordingly through the electrode. Specifically, measuring the size and weight of the fine-grained electrode sheets after segmentation through the electrode sheet measurement unit helps to improve the quality of the electrode sheets and, to a certain extent, improves the accuracy of lithium electrode sheet quality traceability.

[0061] According to an embodiment of the present application, a lithium electrode sheet quality tracing method is provided, and quality tracing is performed using the above-mentioned lithium electrode sheet quality tracing system, as shown in FIG4 , the method comprising:

[0062] Step S101: obtain the electrode number of the lithium electrode sheet to be produced, and establish an EA electrode form database based on the electrode number.

[0063] Step S102: Based on the ea electrode sheet table database, the lithium electrode sheet to be produced is physically divided, and the data of the electrode sheet physical division process is obtained.

[0064] Step S103 , coating and measuring the physically divided lithium electrode sheets, and obtaining data of the electrode sheet coating process and the measurement process.

[0065] Step S104, storing the electrode number, ea electrode form database, data of the electrode physical segmentation process, and data of the coating process and measurement process, and tracing the quality of the lithium electrode sheet based on the stored data.

[0066] This application is based on the EA electrode form database to physically divide the lithium electrode sheets to be produced, and combined with the MES system, it realizes the refinement of the electrode marking and quality traceability. The EA electrode is the smallest electrode unit after physical division. In the wound battery cell, it refers to the electrode used in the production of a single battery cell; in the stacked battery cell, it refers to a stacked electrode. Through the exclusive and comprehensive database of each EA electrode, it can provide adjustment reference data for the pre-adjustment of the downstream production process; in addition, it can also accurately distinguish between good and bad electrodes, avoiding the flow of bad electrodes to subsequent processes and the over-killing and scrapping of good electrodes. The electrode quality statistics are more accurate, and the quality traceability of the electrodes is more convenient and comprehensive.

[0067] Specifically, the process of obtaining the pole piece number of the lithium electrode sheet to be produced in the above step S101 includes: inputting the order information of the lithium electrode sheet to be produced in the MES system, and encoding the lithium electrode sheet to be produced in combination with the preset coding rules to obtain the pole piece number of the lithium electrode sheet to be produced. For example, the preset coding rule is in the form of date + serial number, which is only used as an example and is not limited to this. It can be adaptively adjusted according to actual application needs. This embodiment can accurately know the specific situation of the pole piece and the quality traceability corresponding to the pole piece number through the pole piece number of the lithium electrode sheet, which has the advantages of fast, convenient and accurate quality tracing of the pole piece.

[0068] In this embodiment, the process of establishing an EA electrode form database based on the electrode number includes: obtaining relevant data of each electrode production process according to the electrode number, and establishing an EA electrode form database based on the relevant data, wherein the relevant data include: the order number corresponding to the electrode number, coating batch, slurry batch, date, time, slurry stirring equipment parameters, coating process equipment parameters, first piece inspection data and electrode production process data. The EA electrode form database is shown in Figure 5. It should be noted that the slurry stirring equipment parameters stored in the EA electrode form database include parameters such as slurry temperature and viscosity; the coating process equipment parameters include coating process parameters, coating parameters, coating head and tail piece data, coating electrode process size, coating electrode process weight and coating defect detection parameters; in addition, it also includes rolling head and tail piece data, rolling electrode process thickness, rolling electrode arc height and die-cutting head and tail piece data. This is only for example, and the number and type of parameters are not specifically limited and can be adaptively adjusted according to actual application requirements. Specifically, the key data involved in the EA electrode production process is stored in the EA electrode form database, which helps to quickly achieve fine-grained quality traceability of the electrode.

[0069] Specifically, the physical segmentation of the lithium electrode sheets to be produced in the above-mentioned step S102 includes: under the control of the MES system, the electrode segmentation unit marks the ea of ​​the electrode sheet as a unit, adopts a physical laser coding marking method, and physically segments the lithium electrode sheets to be produced based on the ea electrode sheet form database. The process includes using the laser coding mechanism 3 to code and mark the lithium electrode sheets to be produced according to the electrode sheet numbers of the lithium electrode sheets to be produced, and dividing the positions of each ea electrode sheet to achieve the physical segmentation of the lithium electrode sheets to be produced. In this embodiment, the ea of ​​the electrode sheet is marked as a unit, and the fine-grained physical segmentation of the entire coil of the lithium electrode sheet is achieved through the electrode segmentation unit, which helps to more accurately trace the quality of the lithium electrode sheets.

[0070] In this embodiment, after the physical segmentation of the lithium electrode sheets to be produced is completed, a coating mechanism 4 is used to coat each EA electrode sheet. After each EA electrode sheet is coated, the size is measured using a CCD size measuring device 5 and the weight is measured using an electrode weight measuring device 6. The size and weight data of each coated EA electrode sheet are input into the MES system for storage. Specifically, the electrode sheet measurement unit measures and stores the size and weight of the fine-grained electrode sheets after segmentation, ensuring the high quality of the size and weight of the fine-grained electrode sheets and improving the accuracy of lithium electrode sheet quality traceability to a certain extent.

[0071] Specifically, the process of collecting data of the electrode coating process and the measurement process in the above step S103 includes:

[0072] Step a1: Use the laser code identifier 8 to identify the electrode number of the code mark, obtain the distances from the laser code identifier 8 to the coating mechanism 4, the CCD size measuring device 5 and the electrode weight measuring device 6, and record them as a, b and c respectively.

[0073] Step a2, identifying the pole piece number of each ea pole piece with coding mark, when the laser coding identifier 8 detects the pole piece number of the first ea pole piece, records the value of the tape meter 2 at this time, recorded as m.

[0074] Step a3: When the value of the tape meter 2 is m+a, the coating mechanism 4 starts coating the area to be coated in the first row.

[0075] Step a4: When the value of the tape meter 2 is m+b, the CCD size measuring device 5 starts to measure the size of the coating area of ​​the first row.

[0076] Step a5: When the value of the tape meter 2 is m+c, the pole piece weight measuring device 6 starts to measure the pole piece weight of the coating area of ​​the first row.

[0077] Step a6, and so on, perform the above-mentioned identification, coating and measurement processes on the remaining EA pole pieces, and collect data on the coating process and measurement process of each EA pole piece.

[0078] This embodiment ensures the normal execution of each process of electrode production by setting specific coating and measurement rules. It should be noted that the order of each step in the above process is not specifically limited and is determined according to actual application requirements.

[0079] In this embodiment, the pole piece weight measuring device 6 uses a matrix measurement method to measure the pole piece weight of the coating area. Specifically, the pole piece weight measurement is optimized to a matrix measurement method, which makes the pole piece weight measurement distribution more precise and avoids incomplete weight measurement data and the phenomenon of regional data blanks.

[0080] In a specific embodiment, according to the lithium electrode sheet quality tracing system and method, the quality of any lithium electrode sheet to be traced is traced, and the process includes:

[0081] Step 1: MES system coding. Enter the order information of the lithium electrode sheets to be produced into the MES system. The MES system will code the electrodes to be produced according to the electrode numbers based on the order information. The electrode numbers will accompany the electrode production throughout its entire production life cycle.

[0082] Step 2: Establish an EA electrode form database. The MES system establishes an EA electrode form database based on the electrode number corresponding to the variety, slurry batch, coating batch, coating process parameters, coating parameters, coating head and tail piece data, coating electrode process dimensions, coating electrode process weight, coating defect detection, rolling head and tail piece data, rolling electrode process thickness, rolling electrode arc height, die-cutting head and tail piece data, etc.

[0083] Step 3, laser coding. Referring to Figure 2, this step requires an unwinding mechanism 1, a tape meter 2, a laser coding mechanism 3, a rewinding mechanism 7, and an MES system. The substrate planned for production in the order is loaded onto the unwinding mechanism 1, and the substrate is threaded along the equipment's tape route. The MES system sends the production electrode number to the laser coding mechanism 3. The equipment starts, the unwinding mechanism 1 unwinds, the rewinding mechanism 7 rewinds, the substrate travels at the speed set by the equipment, and the laser coding mechanism 3 starts coding according to the MES system. While coding, the tape meter 2 starts counting the length of the substrate longitudinally. After the substrate travels a certain distance, the laser coding mechanism 3 codes again. This process completes the physical segmentation of the longitudinal electrodes of the substrate, and the rewinding mechanism 7 rewinds the coded substrate. The coding position is located on both sides of the substrate to be coated area, as shown in Figure 6. Two coatings are performed, and each is horizontally cut into two electrodes, corresponding to two laser codes.

[0084] Specifically, the substrate of the lithium electrode sheet to be traced is placed on the unwinding mechanism 1, and is threaded along the middle roller direction to the winding mechanism 7. After threading is completed, the equipment moves the tape, and the tape meter 2 starts to count the meters. At the same time, the MES system sends the arranged electrode sheet number to the laser coding mechanism 3. The laser coding mechanism 3 pauses at the position of the tape and starts to play the first code according to the coding order. The laser coding mechanism 3 pauses after playing the first code, and the equipment continues to move the tape. The tape meter 2 records the number of meters. When the number of meters recorded by the tape meter 2 is subtracted from the number of meters when the laser coding mechanism 3 is paused, that is, when the length of the 1ea electrode sheet is reached, the laser coding mechanism 3 plays the second code. After the laser coding mechanism 3 finishes coding, it pauses, and the tape meter 2 records the current number of meters again. When the number of meters recorded by the tape meter 2 is subtracted from the number of meters when the laser coding mechanism 3 is paused and reaches the length of the 1ea electrode sheet again, the laser coding mechanism 3 plays the third code. This cycle is repeated until the substrate has finished walking, that is, the laser coding marking of the entire coil is completed.

[0085] Step 4, coating and measurement. After the coating mechanism 4 uses the tape-threading substrate to thread the tape according to the tape-threading diagram, it puts the substrate marked with the laser code in step 3 into the unwinding mechanism 1 and connects the tape with the tape-threading substrate. Then the coating mechanism 4 runs the tape, and at the same time the tape meter 2 starts to count meters, the laser code identifier 8 starts to identify the laser code, the tape meter 2 and the laser code identifier 8 jointly locate the Y-axis position of the substrate, the coating mechanism 4 starts coating, the CCD size measuring device 5 starts to measure the size of the pole piece, the pole piece weight measuring device 6 starts to measure the weight of each ea pole piece, the winding mechanism 7 starts to wind, and the MES system collects data of the pole piece production process in real time according to the timeline.

[0086] It should be noted that in step 4, after the coating mechanism 4 coats the first ea electrode, the CCD size measuring device 5 measures the size and defects of the first ea electrode after coating, and after synchronizing with the Y-axis data, the MES system records and stores the X-axis defect data of the first ea electrode; after the coating mechanism 4 coats the second ea electrode, the aforementioned process is repeated until the coating of the entire film roll is completed. After the coating mechanism 4 coats the first ea electrode and measures the size defects, the electrode weight measuring device 6 measures the weight of the first ea electrode after coating, and after synchronizing with the Y- and X-axis data (the Y-axis direction is the tape-feeding direction, and the X-axis direction is the tape-perpendicular direction), the MES system records and stores the weight data of the first ea electrode; after the coating mechanism 4 coats the second ea electrode, the aforementioned process is repeated until the coating of the entire film roll is completed.

[0087] In this embodiment, the MES system records and stores weight and size data, and also records and stores equipment parameters during electrode production. Data on electrode processing in other production steps can also be stored in the MES system.

[0088] Step 5: Quality traceability. The MES system provides a query window that allows you to query the quality of the electrode based on the electrode's date, time, batch number, electrode number, weight data, size data, and equipment parameters.

[0089] It should be noted that the lithium electrode sheet quality tracing system and method of the embodiment of the present application can be applied to other fields where there are other coils of materials where good and bad products cannot be accurately identified and quality tracing is difficult, in addition to the electrodes of lithium batteries. In summary, the lithium electrode sheet quality tracing method of the embodiment of the present application obtains each EA electrode sheet by dividing the entire roll of electrode sheets, and uploads the quality data related to each electrode sheet to the MES system for storage. The data is shared by the subsequent processes and can be called by simply identifying the electrode sheet mark. It can distinguish good and bad products more accurately, effectively prevent bad electrode sheets from flowing to subsequent processes and good electrode sheets from being over-killed and scrapped. The statistics of the electrode sheet quality are more accurate, and the quality tracing of the electrode sheets is more convenient and comprehensive.

[0090] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A lithium electrode sheet quality tracing system, characterized in that: The system comprises: Pole piece segmentation unit, coating unit, pole piece measurement unit and control unit; Wherein, the electrode sheet segmentation unit is used to physically segment the lithium electrode sheet to be produced; The coating unit is used to identify and coat the physically segmented lithium electrode sheets; The electrode sheet measuring unit is used to measure the coated lithium electrode sheet; The control unit is used to control the operation of the electrode segmentation unit, the coating unit and the electrode measurement unit, collect and store data of the electrode physical segmentation process, the coating process and the measurement process, and trace the quality of the lithium electrode sheet based on the stored data.

2. The lithium electrode sheet quality tracing system according to claim 1, characterized in that: The electrode sheet segmentation unit comprises: an unwinding mechanism, a tape meter, a laser coding mechanism and a rewinding mechanism. The lithium electrode sheet to be produced is unwinded by the unwinding mechanism, passes through the tape meter and the laser coding mechanism in sequence, and is rewinded by the rewinding mechanism.

3. The lithium electrode sheet quality tracing system according to claim 1, characterized in that: The coating unit includes: a laser coding identifier and a coating mechanism, wherein the laser coding identifier is used to identify the pole piece number, and the coating mechanism is used to coat the lithium electrode piece to be produced; the pole piece measurement unit includes: a CCD size measuring device and a pole piece weight measuring device, wherein the CCD size measuring device is used to measure the size and position of the coating area on the pole piece, and the pole piece weight measuring device is used to measure the weight of the pole piece, and then feedback the surface density data of the pole piece.

4. A lithium electrode sheet quality tracing method, using the lithium electrode sheet quality tracing system according to any one of claims 1 to 3 to perform quality tracing, characterized in that: The method comprises: Obtain the electrode number of the lithium electrode to be produced, and establish an EA electrode form database based on the electrode number; Based on the EA electrode sheet database, physically segment the lithium electrode sheets to be produced and obtain the data of the physical segmentation process of the electrodes; Coating and measuring the physically divided lithium electrode sheets, and obtaining data on the electrode sheet coating and measurement processes; The electrode number, EA electrode form database, data of the electrode physical segmentation process, and data of the coating process and measurement process are stored, and the quality of the lithium electrode is traced based on the stored data.

5. The lithium electrode sheet quality tracing method according to claim 4, characterized in that: The process of obtaining the electrode sheet number of the lithium electrode sheet to be produced includes: inputting the order information of the lithium electrode sheet to be produced into the control unit, and encoding the lithium electrode sheet to be produced according to the preset coding rules to obtain the electrode sheet number of the lithium electrode sheet to be produced.

6. The lithium electrode sheet quality tracing method according to claim 4, characterized in that: The process of establishing an EA pole piece form database based on the pole piece number includes: obtaining relevant data of each pole piece production process according to the pole piece number, and establishing an EA pole piece form database based on the relevant data, wherein the relevant data include: the order number corresponding to the pole piece number, coating batch, slurry batch, date, time, slurry stirring equipment parameters, coating process equipment parameters, first piece inspection data and pole piece production process data.

7. The lithium electrode sheet quality tracing method according to claim 4, characterized in that: Under the control of the control unit, the electrode segmentation unit marks the electrode piece EA as a unit, and adopts a physical laser coding marking method to physically segment the lithium electrode piece to be produced based on the EA electrode piece form database. The process includes using a laser coding mechanism to code and mark the lithium electrode piece to be produced according to the electrode piece number of the lithium electrode piece to be produced, and dividing the position of each EA electrode piece to realize the physical segmentation of the lithium electrode piece to be produced.

8. The lithium electrode sheet quality tracing method according to claim 7, characterized in that: After the physical segmentation of the lithium electrode sheets to be produced is completed, a coating mechanism is used to coat each EA electrode sheet; after each EA electrode sheet is coated, a CCD size measuring device is used to measure the size and an electrode sheet weight measuring device is used to measure the weight, and the size and weight data of each coated EA electrode sheet are input into the control unit for storage.

9. The lithium electrode sheet quality tracing method according to claim 8, characterized in that: The process of collecting data on the electrode coating process and measurement process includes: A laser coding identifier is used to identify the pole piece number of the coding mark, and the distances from the laser coding identifier to the coating mechanism, the CCD size measuring device and the pole piece weight measuring device are obtained and recorded as a, b and c respectively; Identify the pole piece number of each EA pole piece marked with the coding mark. When the laser coding identifier identifies the pole piece number of the first EA pole piece, record the value of the tape meter at this time, which is recorded as m; When the value of the tape meter is m+a, the coating mechanism starts coating the area to be coated in the first row; When the value of the tape meter is m+b, the CCD size measuring device starts to measure the size of the coating area of ​​the first row; When the value of the tape meter is m+c, the pole piece weight measuring device starts to measure the pole piece weight of the coating area of ​​the first row; And so on, the above-mentioned identification, coating and measurement processes are carried out on the remaining EA pole pieces, and the data of the coating process and measurement process of each EA pole piece are collected.

10. The lithium electrode sheet quality tracing method according to claim 8, characterized in that: The pole piece weight measuring equipment uses a matrix measurement method to measure the pole piece weight in the coating area.

Images