Pole piece tracing system

Abstract

The application provides an electrode sheet tracing system. The system comprises a production device, a detection device arranged in the production device, a manufacturing execution system, an identification label, at least one radio frequency read-write device, and a radio frequency identification management system. The detection device is used to generate detection data information of the electrode sheet. The manufacturing execution system is in communication connection with the production device of each process. The detection data information includes defective information. The identification label is arranged on a reel for carrying the electrode sheet. The identification label internally stores unique identification information of a material roll including the electrode sheet and the reel, logistics information, and defective information of the electrode sheet. The radio frequency read-write device is arranged in at least one of each process and between two adjacent processes. The radio frequency identification management system is in communication connection with the manufacturing execution system and the radio frequency read-write device. In the present application, information interaction is realized in the previous process by means of the radio frequency identification management system and the manufacturing execution system. The defective information and the logistics information can be written into the radio frequency identification chip, information fusion is realized, information reading efficiency is improved, and the flow tracing and quality information tracing of the electrode sheet in the whole process are realized.

Description

Technical Field

[0001] This application relates to the field of lithium battery electrode production technology, and more specifically, to an electrode traceability system. Background Technology

[0002] The front-end processes in lithium battery manufacturing include electrode coating, rolling, and slitting. These front-end processes have historically been a blind spot, lacking the hardware architecture to support traceability of their flow and quality information. This results in defective electrodes detected in the front-end processes still being manufactured into coils / stacks, causing waste and impacting cell consistency and quality. Utility Model Content

[0003] This application addresses the shortcomings of existing methods by proposing an electrode traceability system to solve the technical problem of the lack of hardware architecture capable of supporting traceability of pre-process flow and quality information in related technologies.

[0004] In a first aspect, embodiments of this application provide an electrode traceability system, comprising: Production equipment, located in each process, each production equipment is equipped with a detection device, the detection device is used to generate detection data information of the electrode sheet, the detection data information includes defect information; The manufacturing execution system communicates and connects with the production equipment in each process step; An identification tag is installed on a roll used to carry the electrode sheet. The identification tag includes a radio frequency identification chip, which stores unique identification information of the roll including the electrode sheet and the roll, logistics information, and defect information of the electrode sheet. At least one radio frequency (RF) read / write device is provided in each process and between at least one of two adjacent processes. The radio frequency identification (RFID) management system is communicatively connected to the manufacturing execution system and the RFID reader / writer.

[0005] Optionally, the radio frequency read / write device includes: At least one logistics gate, containing a radio frequency sensor, is located between two adjacent processes to generate logistics information corresponding to a unique identifier for the material roll. The logistics information includes the transfer time information and the transfer location information.

[0006] Optionally, the radio frequency read / write device includes a first radio frequency read / write device; The first radio frequency reading and writing device is installed at the online workstation of each production equipment and is communicatively connected to the radio frequency identification management system. It is used to generate online time information corresponding to the unique identification information of the material roll. The logistics information also includes the online time information.

[0007] Optionally, the radio frequency reader / writer device further includes: The second radio frequency reading and writing device is set at the off-line station of the slitting process and is used to read the unique identification information in the radio frequency identification chip of the slitting sub-rolls based on radio frequency. The manufacturing execution system is used to associate the unique identification information of each sub-roll after slitting with the unique identification information in the RFID chip on the original mother roll before slitting.

[0008] Optionally, the electrode traceability system further includes: The coding device is communicatively connected to the manufacturing execution system and is installed in the coating process. The coding device is used to sequentially code on the electrode during the forward movement of the electrode to form at least two graphic codes, each of which contains unique graphic information. There is at least one code reading device, which is communicatively connected to the manufacturing execution system and is set after the coding device in the coating process, in at least one of the rolling process and the slitting process. It is used to read the graphic information of each graphic code in sequence. The preceding processes include the coating process, the rolling process and the slitting process. Each graphic code has a unique and consecutive sequence number according to the coding order, and the graphic code is bound to the detection data information of the corresponding segment on the electrode.

[0009] Optionally, the production equipment in the preceding process includes an unwinding mechanism and a winding mechanism. An encoder is provided on the unwinding mechanism or the winding mechanism. The encoder is electrically connected to the controller of the corresponding production equipment. The controller is used to determine the unwinding length of the electrode sheet based on the data of the encoder when defective data is detected. The manufacturing execution system is used to determine the sequence number of the graphic code at the corresponding position based on the unwinding length and the spacing between two adjacent graphic codes; and to determine the location of the defect based on the encoder and the sequence number of the graphic code. The adverse information includes at least the type of adverseity, the location of the adverseity, the degree of the adverseity, and the time when the adverseity occurred.

[0010] Optionally, the unique identification information of each roll of material is bound to the broken strip location information and broken strip length information on the electrode sheet. The broken strip location information is determined based on whether the sequence numbers of two adjacent graphic codes are consecutive, and the broken strip length information is determined based on the spacing between each pair of adjacent graphic codes. The manufacturing execution system is also used to determine whether there is a cutting and waste removal operation corresponding to the location where the defect occurred. The radio frequency identification chip also stores information on whether there is a cutting and waste removal operation on the electrode and the cutting length corresponding to each cutting and waste removal operation.

[0011] Optionally, the electrode traceability system further includes: A color mark sensor is electrically connected to the production equipment of the rolling process. The color mark sensor is used to monitor the colored marks on the electrode sheet. The production equipment is used to determine the rolled area and the unrolled area on the electrode sheet based on the colored marks.

[0012] Optionally, the electrode traceability system further includes: The electrode has a plurality of consecutive graphic codes on it, and the spacing between any two adjacent graphic codes is equal.

[0013] Optionally, the coding device includes two laser heads arranged symmetrically in a coating device. The two laser heads are used to form an engraved graphic code on the electrode sheet. The graphic code is located in the coating area, foil area, or insulating layer of the electrode sheet.

[0014] Optionally, along the direction of electrode movement, the coding device is located behind the oven in the coating process, and the graphic code is engraved on the front side of the electrode. The code reading device is installed before the winding mechanism of at least one of the coating process, rolling process, and slitting process, and is used to sequentially read the graphic information of each graphic code on the front side of the electrode sheet after reverse coating and drying.

[0015] Optionally, the plurality of pattern codes on the electrode sheet include N pattern code cycles, each pattern code cycle including a first pattern code of number 2n and a second pattern code of number n, where n is a positive integer.

[0016] Secondly, embodiments of this application provide a method for tracing electrode sheets, including: An identification tag is provided on the roll used to carry the electrode sheet, and the radio frequency identification chip in the identification tag stores unique identification information of the roll including the electrode sheet and the roll. When the material roll comes off the production line at each process, the manufacturing execution system writes the defect information of the electrode sheet transmitted by the production equipment of each process into the radio frequency identification chip; As the material roll is transferred to the next process, the radio frequency reading and writing device reads the unique identification information in the radio frequency identification chip of the identification tag and generates the corresponding material roll's logistics information; The radio frequency identification management system receives and binds the unique identification information and logistics information transmitted by the radio frequency reader / writer, and then forwards them to the manufacturing execution system; The manufacturing execution system shall at least write the defect information of the electrode and the logistics information into the radio frequency identification chip of the identification tag.

[0017] Optionally, after setting the identification tag on the roll used to carry the material roll, and before the manufacturing execution system writes the defect information of the electrode sheet transmitted by each production device into the RFID chip when the material roll comes off the line at each process, the process includes: The marking device marks the electrode sheet sequentially to form at least two graphic codes. Each graphic code contains unique graphic information, and the spacing between any two adjacent graphic codes is equal. The manufacturing execution system generates a sequence number corresponding to each of the graphic codes according to the coding order; The code reading device sequentially reads the graphic information of each graphic code on the electrode sheet; The manufacturing execution system determines the sequence number of the graphic codes by sequentially transmitting the graphic information of the graphic codes from the code reading device, and binds the sequence number of the graphic codes with the detection data information of the corresponding segment. The manufacturing execution system determines the breakage location and breakage length information of the electrode sheet based on the spacing between the two graphic codes, and binds the breakage location information and the breakage length information to the unique identification information of the radio frequency identification chip on the corresponding material roll.

[0018] Optionally, when the material roll comes off the production line at each process, the manufacturing execution system writes the defect information of the electrode sheet transmitted by the production equipment of each process into the radio frequency identification chip, including: The production equipment determines the time when defective data is detected as the time point when the defect occurs. The production equipment determines the unwinding length corresponding to the location of the defect on the electrode sheet based on the encoder on the winding or unwinding mechanism at the time point when the defect occurs. The manufacturing execution system determines the sequence number of the graphic code at the corresponding position based on the unwinding length and the spacing between two adjacent graphic codes, and determines the location of the defect based on the unwinding length and the sequence number of the graphic code. The manufacturing execution system writes the location of the defect, the time of the defect, the type of defect, and the degree of defect into the identification chip. The defect information includes the location of the defect, the type of defect, the degree of defect, and the time of the defect.

[0019] Optionally, when the material roll comes off the production line at each process, the manufacturing execution system writes the defect information of the electrode sheet transmitted by the production equipment of each process into the radio frequency identification chip, and further includes: The manufacturing execution system determines whether a waste removal operation is required based on the sequence number of the graphic code corresponding to the location where the defect occurred; If the waste removal operation is performed, the manufacturing execution system determines the cutting length based on the distance between two adjacent graphic codes corresponding to the defect location and the difference in the sequence number, and writes the waste removal operation information and the cutting length into the radio frequency identification chip. If the waste removal operation does not exist, the manufacturing execution system will write the information that no waste removal operation exists into the radio frequency identification chip.

[0020] The beneficial technical effects of the technical solutions provided in this application include: In this embodiment, an identification tag containing an RFID chip is embedded on each roll carrying the electrode sheet. An RFID management system communicating with the manufacturing execution system (MES) is designed in the preceding processes (including coating and slitting processes), along with an RFID reader / writer device communicating with the RFID management system. This provides the hardware foundation or framework for the electrode sheet traceability system of this application to achieve traceability of the preceding processes and the entire process, as well as quality traceability. Based on this hardware framework, the traceability system of this application can achieve information fusion between the RFID management system and the MES. During electrode sheet circulation, the unique identification information inside the RFID chip is read by the RFID reader device to generate the roll circulation information. The circulation information corresponding to the unique identification information of the electrode sheet is uploaded to the RFID management system, which then transfers the logistics information to the MES, thereby enabling information interaction and binding between the RFID management system and the MES. The MES can directly write the logistics information into the RFID chip. When the electrode sheet is transferred to the next process and when it is put into operation in the next process, the radio frequency reading and writing equipment reads all the previous logistics information and unique identification information, forms a new logistics information and uploads it to the radio frequency identification management system, which can realize the flow traceability of the previous process and the entire process of battery cell production.

[0021] Furthermore, in the preceding process, the manufacturing execution system also writes all defect information of the electrode into the radio frequency identification chip of the corresponding electrode, which is convenient to read directly in the next process. This can improve the real-time performance of information reading and uploading, and improve the efficiency of information uploading. Defect information is an important part of the huge amount of electrode inspection data, which can reflect the quality information of the corresponding electrode, thereby realizing the traceability of quality information in the preceding process.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1A schematic diagram illustrating the framework of an electrode traceability system and multiple production processes provided in this application embodiment; Figure 2 This is a schematic diagram illustrating the working principle of the coating process in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the electrode sheet containing graphic codes in the foil areas on both sides in an embodiment of this application; Figure 4 This is a schematic diagram of the graphic code formed on surface A of the electrode in an embodiment of this application; Figure 5 This is a flowchart illustrating a method for tracing electrodes provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 10-Manufacturing Execution System; 20 - Identification tag; 21 - Radio frequency identification chip; 30 - Radio frequency (RF) reader / writer; 31 - Logistics gate; 32 - First RF reader / writer; 33 - Second RF reader / writer; 40-Radio Frequency Identification Management System; 50 - Coding equipment; 60 - Code reading equipment; 70 - Color mark sensor; 80 - Graphic code; 81 - First graphic code; 82 - Second graphic code; 90 - Oven; 100 - Electrode; 101 - Coating area; 102 - Foil area; 103 - Insulation layer; 110 - Roll. Detailed Implementation

[0025] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0026] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the art. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0028] Reference Figures 1-4 This application provides an electrode traceability system, including production equipment, manufacturing execution system 10, identification tag 20, radio frequency reader / writer 30, and radio frequency identification management system 40.

[0029] Each production process equipment is equipped with a testing device (not shown in the figure), which is used to generate test data information for the electrode sheets.

[0030] The manufacturing execution system 10 is connected to the production equipment of each process and is used to receive and store the inspection data information transmitted by the production equipment, including defect information.

[0031] An identification tag 20 is disposed on the roll 110 used to carry the electrode sheet. The identification tag 20 includes an RFID chip 21, which stores unique identification information of the roll including the electrode sheet 100 and the roll 110.

[0032] At least one radio frequency (RF) reader / writer device 30 is provided in each process and between at least one of two adjacent processes. It is used to generate logistics information for the corresponding material roll based on the unique identification information in the RF identification chip 21 of the RF reading and identification tag 20.

[0033] The RFID management system 40 is communicatively connected to the manufacturing execution system 10 and the RFID reader / writer 30. It receives and binds the unique identification information and logistics information transmitted by the RFID reader / writer 30, and then forwards them to the manufacturing execution system 10. The manufacturing execution system 10 is used to write at least the defective information and logistics information of the electrode 100 into the RFID chip 21 of the corresponding material roll. This ensures that the RFID chip 21 stores the unique identification information of the material roll, the logistics information, and the defective information of the electrode 100. In this embodiment, an identification tag 20 containing an RFID chip 21 is embedded in each coil 110 carrying the electrode sheet. Furthermore, an RFID management system 40 and an RFID reader / writer 30, which are communicatively connected to the manufacturing execution system 10, are designed in the preceding processes (including from coating to slitting). This provides a hardware foundation or framework for the electrode sheet traceability system of this application to achieve traceability of the preceding processes and the entire process, as well as quality traceability. Based on this hardware framework, the traceability system of this application can achieve information fusion between the RFID management system 40 and the manufacturing execution system 10. During electrode sheet circulation, the unique identification information inside the RFID chip 21 is read by the RFID reader / writer to generate coil circulation information. The circulation information corresponding to the unique identification information of the coil is uploaded to the RFID management system 40, which then transfers the logistics information to the manufacturing execution system 10. This enables information interaction and binding between the RFID management system 40 and the manufacturing execution system 10, allowing the manufacturing execution system 10 to directly write logistics information into the RFID chip 21. When the electrode sheet is transferred to the next process and when it is put into operation in the next process, the radio frequency reading and writing device 30 reads all the previous logistics information and unique identification information, forms a new logistics information and uploads it to the radio frequency identification management system 40, which can realize the flow traceability of the previous process and the entire process of battery cell production.

[0034] Furthermore, in the previous process, the manufacturing execution system 10 also writes the defect information of the electrode 100 into the radio frequency identification chip 21 of the corresponding electrode, which is convenient to read directly in the next process. This can improve the real-time performance of information reading and uploading, and improve the efficiency of information uploading. The defect information is an important part of the huge amount of electrode inspection data, which can reflect the quality information of the corresponding electrode 100, thereby realizing the traceability of the quality information of the previous process.

[0035] In this embodiment, during the unwinding and rewinding process of the electrode 100, the built-in detection device of the production equipment detects the quality data of the electrode 100, such as areal density detection, thickness detection, and appearance defect detection. Multiple detection data information are generated according to the detection category. The detection data information includes defect information.

[0036] Optionally, the defect information in this application embodiment is actually a data packet containing at least the following elements: the specific type of defect (such as areal density deviation, scratches, exposed foil); the location of the defect (the batch number of the electrode and at which meter of the electrode the defect occurred); the degree of defect, i.e. the degree of deviation from the standard; and the time point of the defect.

[0037] In this embodiment, the production equipment for each process can determine whether to perform cutting and waste removal processing or skip cutting processing based on the specific type and degree of defect. Information on whether cutting and waste removal operations have been performed and the cutting length are also stored in the RFID chip 21. Therefore, the defect information in this application also includes information on whether cutting and waste removal operations have been performed and the cutting length information.

[0038] Because the storage space within the RFID chip 21 is limited, it only stores some key information from the aforementioned defect information and does not contain actual detection values. This allows for the rapid acquisition of crucial information that can improve electrode production quality from the large volume of data in the preceding processes, thereby enhancing electrode production quality and reducing traceability difficulties. This will be discussed in detail later.

[0039] This application chooses to directly embed the identification tag 20 with the radio frequency identification chip 21 into the roll 110. With the help of radio frequency identification technology (RFID), specific targets can be identified and related data can be read and written through radio signals without the need for mechanical or optical contact between the identification system and the specific target. This avoids the influence of network fluctuations, thereby improving the real-time performance of information transmission, adapting to the current automated production line, effectively improving production efficiency, and avoiding the inability to identify due to scratches on paper identification tags, thus avoiding information loss during circulation.

[0040] Optionally, the Manufacturing Execution System 10 of this application is a MES (Manufacturing Execution System). Each production device in each process also has a unique ID number, and the unique ID number of each production device is stored in the Manufacturing Execution System 10. The production time of the electrode is stored in the production device.

[0041] Optionally, the RFID chip 21 may also store information such as batch information of the electrode and operator information.

[0042] Optionally, refer to Figure 1 The RFID reader / writer 30 includes a logistics gate 31. There is at least one logistics gate 31, which includes an RFID sensor and is positioned between two adjacent processes. The sensor is used to generate transfer time information and transfer location information corresponding to the unique identifier of the roll based on the unique identifier information of the RFID chip 21 of the identification tag 20 on the roll 110. The logistics information includes transfer time information and transfer location information.

[0043] The battery cell manufacturing process includes front-end processes, mid-stage processes, and back-end processes. The front-end processes consist of coating, rolling, and slitting. The mid-stage processes include winding / stacking, casing, electrolyte injection, and end cap welding. The back-end processes include testing, capacity testing, inspection / packaging, and warehousing.

[0044] In this embodiment, at least one logistics gate 31 is provided between two adjacent processes, and the number of logistics gates 31 is consistent with the number of production equipment in each process. For example, the operator can know when and through which logistics gate 31 the master stock rolls coming off the coating process No. 1 production equipment pass through to the rolling process. They can also know when and through which logistics gate 31 the multiple sub-rolls coming off the master stock rolls after slitting in the slitting process pass through to the winding / stacking process in the intermediate stage. Each time a roll is transferred, the radio frequency sensor on the logistics gate 31 can sense the radio frequency identification chip 21 inside the corresponding roll 110, identify the unique identification information of the roll 110, and upload the transfer time and location information of the roll 110 (material roll) to the radio frequency identification management system 40, binding it with the unique identification information of the roll 110, thereby enabling traceability of the transfer information of each roll between processes.

[0045] Furthermore, since the production process in the middle stage is relatively slow, products from the previous stage are prone to backlog. Therefore, by setting up a logistics gate 31 between two adjacent stages, the production equipment of each stage can be used to determine the off-line time of the material roll, the logistics gate 31 can be used to determine the time when the material roll is transferred to the next stage, and the production equipment of the next stage can be used to determine the on-line time of the material roll. This enables the traceability of the entire material roll flow, making the traceability of the material roll flow more refined and improving the efficiency of subsequent queries.

[0046] Optionally, refer to Figure 1 The RFID reader / writer 30 includes a first RFID reader / writer 32 installed at the online workstation of each production equipment. The first RFID reader / writer 32 is communicatively connected to the RFID management system 40 and is used to read the unique identification information of the roll in the RFID chip 21 of the identification tag 20 and generate online time information corresponding to the unique identification information of the roll. The manufacturing execution system 10 is used to receive the online time information transferred by the RFID management system 40 and write it into the identification tag 20. The logistics information also includes the online time information.

[0047] In this embodiment, taking the flow from the coating process to the rolling process as an example, each production equipment in the rolling process is equipped with a first radio frequency (RF) reader / writer 32. The first RF reader / writer 32 also has an RF sensor similar to the logistics gate 31. Before the material roll is put into production, the first RF reader / writer 32 sequentially senses and identifies the RF identification chip 21 inside the roll 110, binding the unique identification information of the roll 110 with the roll's online time information, and uploading it to the manufacturing execution system 10. Thus, combined with the logistics information transferred from the logistics gate 31 to the manufacturing execution system 10 via the RF identification management system 40, the operator can know when and how the master material roll coming off the coating process's production equipment 1 passed through which logistics gate 31 to which production equipment's online station in the rolling process. It can also be found that, in the slitting process, after the master stock roll is slitting, the multiple sub-rolls that come off the line, at what time, through which logistics gate 31, are transferred to which production equipment in the winding / stacking process of the intermediate stage.

[0048] When a product roll comes off the production line, the production equipment generates the roll-off time for the roll 110 and uploads it to the Manufacturing Execution System 10. The Manufacturing Execution System 10 writes the unique identification information of the roll 110, along with the roll-on and roll-off time information from the rolling process, into the RFID chip 21 inside the roll 110. This allows the first RFID sensor at the slitting station (the next process) to directly read the roll 110's flow information from the coating and rolling processes, eliminating the need to search, retrieve, or download from the Manufacturing Execution System 10. This improves information reading efficiency, better adapts to the rapid operation of automated production lines, and ultimately increases production efficiency.

[0049] Optionally, refer to Figure 1 The RFID reader / writer 30 also includes a second RFID reader / writer 33 located at the off-line station of the slitting process. The second RFID reader / writer 33 is used to read the unique identification information in the RFID chip 21 on the slitting sub-rolls based on RFID.

[0050] The manufacturing execution system 10 is used to associate the unique identification information of each sub-roll after slitting with the unique identification information in the radio frequency identification chip 21 on the mother roll before slitting.

[0051] In the slitting process, the master electrode sheets on the master material roll need to be unwound and slit to form multiple sub-electrodes, and finally wound onto multiple rolls 110 to form multiple sub-rolls. Therefore, it is necessary to transfer the logistics information of the RFID chip 21 inside the master material roll to the RFID chip 21 of the sub-roll.

[0052] In this embodiment, a second RFID reader / writer 33 is installed at the off-line station of the slitting process, and RFID chips 21 are embedded inside multiple sub-rolls. When the first RFID reader reads the unique identification information (original ID) of the parent roll and confirms that the sub-roll has been written with a new ID by the second RFID reader, the manufacturing execution system 10 performs the following operations in the database: Record the event of splitting.

[0053] Establish the association between the master stock and the child stock in the database. That is, associate the new ID of all child stock with the original ID of the master stock.

[0054] At the same time, all or part of the attribute information of the master stock (such as material batch, circulation information, etc.) is automatically inherited to the data record of the new ID of each sub-stock.

[0055] When any sub-roll flows to subsequent processes (such as winding or assembly), workers or equipment only need to use an RFID-based reader to read the RFID chip 21 inside the sub-roll. The manufacturing execution system 10 will then query the central database in real time based on the ID number of the scanned RFID chip 21. The database can trace not only the production and flow information of this sub-roll, but also the entire historical information of its parent roll, thus achieving complete traceability.

[0056] Optionally, refer to Figures 2-3 , Figure 2 The direction of the middle arrow indicates the movement direction of the electrode 100 during the coating process. The electrode traceability system also includes: The coding device 50, which is communicatively connected to the manufacturing execution system 10, is installed in the coating process. The coding device 50 is used to sequentially code the electrode 100 during its forward movement, forming at least two graphic codes 80. Each graphic code 80 contains unique graphic information.

[0057] There is at least one barcode reader 60, which is communicatively connected to the manufacturing execution system 10. It is installed after the coding device 50 in the coating process, in the rolling process, or in the slitting process, and is used to read the graphic information of each graphic code 80 in sequence.

[0058] The manufacturing execution system 10 is used to generate a sequence number for each graphic code 80 according to the coding sequence of the coding device 50. The manufacturing execution system 10 is also used to bind the sequence number of the graphic code 80 with the detection data information of the corresponding segment on the electrode 100.

[0059] In this embodiment, as the electrode 100 is gradually unwound, the coding device 50 sequentially codes the electrode 100, forming continuous graphic codes 80 on the electrode 100. Each time the coding device 50 codes a code, the generated electrical signal is transmitted to the manufacturing execution system 10. The manufacturing execution system 10 assigns a unique serial number to each graphic code 80, ensuring that the sequentially formed multiple consecutive graphic codes 80 have consecutive numerical serial numbers, and each graphic code 80's numerical serial number is bound to its unique graphic information. A code reading device 60 is installed in the production equipment used for the coating, rolling, and slitting processes. The code reading device 60 can read the graphic codes 80 sequentially as the electrode 100 is rewound, and the read graphic information is sequentially uploaded to the manufacturing execution system 10. The manufacturing execution system 10 can determine the serial number of the graphic code 80 based on the graphic information.

[0060] In this embodiment, all defect information on the electrode 100 is recorded in the RFID chip 21 of the corresponding roll. The detection data information of the portion of the electrode 100 corresponding to the graphic code 80 is bound in the manufacturing execution system 10, enabling information interaction between the RFID management system 40 and the manufacturing execution system 10. In the next process, the first RFID reader 30 can identify all defect information on the electrode 100. Then, as the electrode 100 is unwound, the reader 60 sequentially scans the graphic code 80 to obtain all detection data information of the corresponding segment of the electrode 100 from the previous process. This achieves complete traceability of quality information from the previous process, allowing for precise identification of a specific segment of the electrode 100 and improving the accuracy of quality traceability. Furthermore, the traceability system in this embodiment saves data storage space within the manufacturing execution system 10 and increases the speed of defect information retrieval.

[0061] Optionally, along the movement direction of the electrode 100, the code reading device 60 is positioned after the detection device of the corresponding process. After the detection data information of the detection device is sequentially uploaded to the manufacturing execution system 10, the graphic information of the graphic code 80 subsequently uploaded by the code reading device 60 is bound in the manufacturing execution system 10 to the detection data information of the corresponding segment on the electrode 100.

[0062] The manufacturing execution system 10 is also used to determine the breakage location and breakage length information of the electrode sheet 100 based on the graphic information of each graphic code 80 sent sequentially by the code reader 60, and based on whether the sequence numbers of two adjacent graphic codes 80 are consecutive. The manufacturing execution system 10 also binds the breakage location information and breakage length information to the unique identification information of the RFID chip 21 on the corresponding material roll.

[0063] In related technologies, electrode 100 may experience tape breakage and rejoining issues. For example, based on defective information, broken tapes are discarded. Another example is during the rolling process, where excessive pressure or uneven tension on electrode 100 may cause it to break, resulting in tape breakage. When manually rejoining the tape, both ends of the broken tape (or defective portion) need to be trimmed before being glued together to ensure a smooth joint, allowing for direct use in subsequent processes. However, since the cutting and rejoining operations are currently performed manually, the cutting length depends on the operator's experience and skill level. This makes it impossible to determine the location and length of the broken tape, hindering quality traceability of electrode 100.

[0064] If the sequence numbers of two adjacent graphic codes 80 are interrupted, it indicates a break in the tape at the interruption point, thus allowing for precise determination of the break location. Based on the difference in sequence numbers at the break location and the known spacing between two adjacent graphic codes 80 in the production equipment, the break length can be determined. After obtaining the break location and length information of the electrode 100, the manufacturing execution system 10 can directly remove the detection data associated with at least one graphic code 80 corresponding to the break portion, thereby improving the accuracy of quality traceability.

[0065] Optionally, refer to Figures 2-3 The electrode traceability system of this application also includes a color mark sensor 70. The color mark sensor 70 is disposed in the rolling process and electrically connected to the production equipment of the rolling process. The color mark sensor 70 is used to monitor the colored marks on the electrode 100, and the production equipment is used to determine the rolled area and the unrolled area on the electrode 100 based on the color mark sensor 70.

[0066] If, during the rolling process, a strip breaks and is reconnected at a certain location on the electrode 100 without undergoing further rolling, the color of the colored mark at the reconnection location will be inconsistent with the color of the electrode that has passed through the rolling area. In this embodiment, by designing a color mark sensor 70 within the rolling process, the production equipment can detect the rolled and unrolled areas on the electrode 100 based on the color mark sensor, thereby improving production quality.

[0067] Optionally, in the rolling process, the color mark sensor 70 is positioned before the code reading device 60.

[0068] Optionally, the production equipment in the preceding process includes an unwinding mechanism (not shown in the figure) and a rewinding mechanism (not shown in the figure). An encoder is provided on the unwinding mechanism or the rewinding mechanism. The encoder is electrically connected to the controller of the corresponding production equipment. The controller determines the unwinding length of the electrode 100 based on the encoder data when defective data is detected.

[0069] The manufacturing execution system 10 is used to determine the sequence number of the pattern code 80 at the corresponding position based on the unwinding length and the spacing between two adjacent pattern codes 80; and to determine the position where the defect occurs based on the encoder and the sequence number of the pattern code 80.

[0070] Adverse information should include at least the type of adverse event, the location of the adverse event, the severity of the adverse event, and the time when the adverse event occurred.

[0071] In this embodiment, the time when the detection device detects defective data is defined as the time point at which the defect occurs. By etching a series of consecutive graphic codes 80 on the electrode 100, it is possible to cooperate with the encoder on the unwinding mechanism to accurately determine the location of the defect on the electrode 100.

[0072] To illustrate with a concrete example: In the coating process, an encoder is installed on the unwinding mechanism. The electrical signal generated by the encoder can be transmitted to the controller of the production equipment in real time. The production equipment can then determine the unwinding length of the electrode 100 when defective data is detected based on the encoder readings. For instance, when the electrode 100 is unwound 200 meters, the detection device detects defective data and uploads the time of the defect and the unwinding length of the electrode 100 to the manufacturing execution system 10. Simultaneously, the type and severity of the defect are also uploaded to the manufacturing execution system 10.

[0073] Simultaneously, the manufacturing execution system 10 can also determine and record the sequence number of the graphic code 80 corresponding to the defective location based on the known spacing between two adjacent graphic codes 80 on the production equipment. That is, the manufacturing execution system 10 determines the location of the defect based on both the encoder and the sequence number of the graphic codes 80. Even if a tape breakage occurs in the next process, the graphic information of the graphic codes 80 is read sequentially by the code reader 60, allowing the manufacturing execution system 10 to accurately locate the defective location based on the sequence number of the graphic codes 80. This enables the production equipment to be instructed to stop at the correct location, allowing the defective portion of the electrode sheet 100 to be cut and discarded.

[0074] Optionally, the manufacturing execution system 10 is further configured to determine whether a cutting and waste removal operation exists at the location of the defect based on the sequence number of the graphic code 80 corresponding to the location where the defect occurred, and to write the information on whether a cutting and waste removal operation exists and the cutting length into the radio frequency identification chip 21. The radio frequency identification chip 21 also stores information on whether a cutting and waste removal operation exists on the electrode 100 and the cutting length corresponding to each cutting and waste removal operation.

[0075] In one scenario: if the graphic code 80 at the corresponding defective location uploaded by the code reader 60 to the manufacturing execution system 10 is missing, the manufacturing execution system 10 determines that a cutting and waste removal operation has been performed during the coating process. Furthermore, the manufacturing execution system 10 determines the cutting length based on the number of missing graphic codes 80 and the distance between two adjacent graphic codes 80 after splicing.

[0076] Subsequently, when the coating process is completed, the manufacturing execution system 10 binds the information about the cutting and waste removal operation performed in the coating process, as well as the cutting length, to the unique identification information of the RFID chip 21 corresponding to the electrode 100. This allows the electrode 100 (or the roll) to directly obtain key production information by reading the RFID chip 21 when it enters the rolling process, thereby improving production efficiency.

[0077] In another scenario: if the graphic code 80 at the corresponding defective location uploaded by the code reader 60 to the manufacturing execution system 10 is not missing, the manufacturing execution system 10 determines that no cutting and waste removal operation was performed in the coating process.

[0078] Subsequently, when the coating process is completed, the defect information and the information about not performing the cutting and waste removal operation are written into the RFID chip 21 of the corresponding material roll.

[0079] At the roll forming station, the first radio frequency (RF) reader reads defective information and information about missing cutting and waste removal from the RF identification chip 21 and uploads it to the manufacturing execution system 10. Thus, the manufacturing execution system 10 can determine the unwinding length based on the electrical signal transmitted by the encoder during unwinding, and determine the sequence number of the graphic codes 80 based on the unique graphic information of the graphic codes 80 uploaded sequentially by the code reader 60. Even if a tape breakage operation occurred before this, the system can accurately determine the stop position, ensuring precise cutting and waste removal.

[0080] In subsequent slitting processes, the graphic code 80 can still be read sequentially using the code reading device 60, thereby determining the specific strip length information during the aforementioned cutting operation. Therefore, this embodiment of the application achieves the interactive fusion of multiple types of information, solving the problem of a large amount of information in the preceding processes and the difficulty in tracing process quality.

[0081] It should be noted that, Figure 3 The serial number below each graphic code 80 represents the sequence number of the graphic code 80 determined in the manufacturing execution system 10. This is for illustrative purposes only; the sequence number of the graphic code will not be displayed on the electrode 100 after coding. Furthermore, the aforementioned "broken strip" refers to a break at a certain point on the electrode 100, while "joining strip" refers to joining the broken ends of the electrode 100 to form a continuous electrode 100. "Cutting and waste removal" refers to cutting off the defective portion of the electrode 100 and rejoining the broken ends of the electrode 100 to form a continuous electrode 100.

[0082] Optionally, refer to Figure 3 The electrode traceability system of this application embodiment also includes an electrode 100, on which a plurality of consecutive graphic codes 80 are provided, and the spacing between any two adjacent graphic codes 80 is equal.

[0083] Optionally, the electrode 100 includes a coating area 101, foil areas 102 located on both sides of the coating area 101, and an insulating layer 103. The insulating layer 103 covers the edges of the coating and foil areas along the boundary line between the coating area and the foil area. The marking device 50 includes two laser heads arranged symmetrically in the coating equipment. The two laser heads are used to form an engraved graphic code 80 on the electrode 100. The graphic code 80 is disposed in the coating area 101, the foil area 102, or the insulating layer 103 of the electrode.

[0084] In this embodiment, a graphic code 80 is laser-engraved on the electrode 100. The code reading device 60 can optically identify the unique graphic information of the graphic code 80. Furthermore, by laser-engraving the graphic code 80 on both sides of the electrode 100, during "Z"-shaped sampling inspection of the electrode 100, the serial number of the electrode 100 to be sampled can be determined by comparing and querying the serial numbers of the graphic codes 80 on both sides of the electrode 100. This allows the serial number (i.e., position) of the electrode 100 to be correlated with specific detection data information, improving the accuracy and speed of subsequent tracing and lookup.

[0085] The graphic code 80 can be engraved on the coating area 101, the foil area 102, or the insulating layer 103. In this embodiment, the graphic code 80 is set in the foil area 102 as an example.

[0086] Optionally, the graphic code 80 in this application embodiment includes, but is not limited to, a QR code.

[0087] Optionally, refer to Figure 2 and Figure 3 Along the direction of movement of the electrode 100, the coding device 50 is set behind the oven 90 in the coating process, and the graphic code 80 is engraved on the front of the electrode 100.

[0088] The code reading device 60 is installed before the winding mechanism of at least one of the coating process, rolling process and slitting process, and is used to sequentially read the graphic information of each graphic code 80 on the front side of the electrode sheet 100 after reverse coating and drying.

[0089] In the coating process, the electrode 100 needs to be unwound, coated on the front side, dried on the front side, coated on the back side, dried on the back side, and finally wound onto the roll 110. In this embodiment, by placing the coding device 50 behind the oven 90 in the coating process, the electrode 100 is coded after the front side coating and drying. After coding, the electrode 100 undergoes back side coating and back side drying, and then passes through the code reader 60 to sequentially read the graphic code 80. Therefore, this application only needs to code the front side of the electrode 100, which can save time and improve production efficiency.

[0090] Optionally, refer to Figure 4 The multiple graphic codes 80 on the electrode 100 include N graphic code cycles, each graphic code cycle including a first graphic code 81 with a quantity of 2n and a second graphic code 82 with a quantity of n, where n is a positive integer.

[0091] Because the two sides of the double-coated electrode 100 are in different electrochemical environments inside the battery, the structure of a double-coated electrode 100 is: coating A (A side) - current collector (foil) - coating B (B side). Therefore, when this electrode 100 is wound up, side A will be located on the inside of the roll, and side B will be located on the outside of the roll.

[0092] Because the inner coating is subjected to compressive stress while the outer coating is subjected to tensile stress, this difference in mechanical stress can lead to minor coating cracking, peeling, or changes in contact resistance with the current collector. Furthermore, the curvature stress, electrolyte wetting rate, contact pressure with the separator, and heat dissipation conditions of the inner and outer coatings differ. Therefore, companies typically standardize the electrode 100 at the source of production, dividing it into A rolls and B rolls. A roll (inner roll) is the electrode 100 roll with the A-side coating facing the winding needle (i.e., the inner ring of the battery cell) during winding. B roll (outer roll) is the electrode 100 roll with the B-side coating facing the winding needle (i.e., the inner ring of the battery cell) during winding.

[0093] When performing laser marking, the pairing of rolls A and B needs to be considered to ensure the consistency of the internal structure of the battery cell, eliminate performance deviations caused by winding curvature, and improve the consistency and reliability of the battery pack. In this embodiment, during the coating process, the laser marking frequency can be controlled by setting the level in the production equipment. This allows 2n first graphic codes 81 to be formed on the A side of the electrode 100 via laser marking, forming an A1 sub-cycle. Subsequently, n second graphic codes 82 are formed on the A side via laser marking, forming a B1 sub-cycle. One graphic code cycle includes one A1 sub-cycle and one B1 sub-cycle.

[0094] It should be noted that, in order to represent an engraving cycle, Figure 4In the code, only black squares represent the first graphic code 81 and the second graphic code 82. In reality, each first graphic code and each second graphic code is a different QR code with unique graphic information. Figure 4 For illustrative purposes only.

[0095] Secondly, refer to Figures 1-5 Based on the same inventive concept, embodiments of this application provide a method for tracing electrode sheets, including steps S101-S105: S101: An identification tag 20 is provided on the electrode 100 used to carry the material roll. The radio frequency identification chip 21 in the identification tag 20 stores the unique identification information of the material roll including the electrode 100 and the roll 110.

[0096] Optionally, identification tags 20 are pre-embedded on multiple rolls 110, and the unique identification information in the identification tags 20 embedded on the unwinding roll and the rewinding roll corresponding to the same material roll is consistent, that is, the ID number is the same.

[0097] S102: When the material roll comes off the production line at each process, the manufacturing execution system 10 writes the defect information of the electrode 100 transmitted by the production equipment of each process into the radio frequency identification chip 21.

[0098] In this embodiment, the production equipment can sequentially scan the graphic code 80 on the electrode 100 to determine the defect information on each roll of material. Furthermore, the defect information is only a small part of the various inspection data and requires minimal memory. Therefore, the defect information can be directly written into the identification tag 20 and bound to the unique identification information of the corresponding roll, facilitating the traceability of the roll's quality information and improving the efficiency of information retrieval in subsequent processes.

[0099] S103: As the material roll is transferred to the next process, the radio frequency reading and writing device 30 reads the unique identification information in the radio frequency identification chip 21 of the identification tag 20 and generates the corresponding material roll's logistics information.

[0100] S104: The RFID management system 40 receives and binds the unique identification information and logistics information transmitted by the RFID reader / writer 30, and then forwards them to the manufacturing execution system 10.

[0101] In this embodiment of the application, an RFID management system 40 is designed in the previous process to interact with the manufacturing execution system 10, thereby enabling the transfer of logistics information to the manufacturing execution system 10.

[0102] S105: The manufacturing execution system 10 writes at least the defect information and logistics information of the electrode 100 into the radio frequency identification chip 21 of the identification tag 20.

[0103] In this embodiment, the logistics information from the preceding process is directly written into the RFID chip 21 of the corresponding material roll. The production data and inspection data of the electrode 100 are stored in the manufacturing execution system 10 and bound to the unique identifier of the corresponding material roll, thus achieving information fusion. By reading the RFID chip 21, the flow information and defect information can be directly obtained. Then, the production data and inspection data bound to the material roll can be retrieved from the manufacturing execution system 10, thereby effectively improving the efficiency of information reading and realizing full-process flow traceability and quality traceability.

[0104] Optionally, after the identification tag 20 is provided on the roll 110 used to carry the material roll, and before the manufacturing execution system 10 writes the defect information of the electrode 100 transmitted by each production equipment to the radio frequency identification chip 21 when the material roll comes off the production line at each process, the process includes: The marking device 50 marks the electrode 100 sequentially to form at least two graphic codes 80. Each graphic code 80 contains unique graphic information, and the spacing between any two adjacent graphic codes 80 is equal.

[0105] The manufacturing execution system 10 generates a sequence number corresponding to each of the graphic codes 80 according to the coding order.

[0106] The code reading device 60 sequentially reads the graphic information of each graphic code 80 on the electrode 100.

[0107] The manufacturing execution system 10 determines the sequence number of the graphic codes 80 by sequentially transmitting graphic information from the code reading device 60, and binds the sequence number of the graphic codes 80 with the detection data information of the corresponding segment.

[0108] The manufacturing execution system 10 determines the breakage location and length information of the electrode 100 based on whether the sequence numbers of the two graphic codes 80 are consecutive and the spacing, and binds the breakage location and length information to the unique identification information of the radio frequency identification chip 21 on the corresponding material roll.

[0109] In this embodiment, during subsequent quality traceability, all inspection data (such as coating density, roll thickness, etc.) of a specific segment of the electrode 100 can be immediately retrieved by scanning the graphic code 80 on the electrode 100 used in the battery cell. If the data shows that the surface density of that segment is low, the root cause of the problem can be precisely located. Only a small number of battery cells made using the problematic segment of the electrode 100 need to be traced and isolated, greatly reducing scrap losses. By setting multiple consecutive graphic codes on the electrode 100, all breakage issues generated in the previous process can also be resolved, enabling the manufacturing execution system 10 to automatically remove the inspection data bound to the graphic code 80 corresponding to the cut-off portion of the electrode 100, ensuring the accuracy of subsequent quality traceability.

[0110] In the intermediate and final stages of the process, after the battery cell is assembled, it can be identified by its casing code, which also has a unique ID and is bound to the unique identification information of the corresponding material roll in the previous process. This allows for the querying of quality and flow information from the previous process based on multiple bound unique identifiers. Furthermore, it enables the detection of problematic cells in the capacity grading stage and their correlation with the corresponding electrode data (100). This achieves full-process traceability of the battery cell. Problematic cells in the module stage / after shipment can be directly located to identify cells using the same batch of electrode material, allowing for the identification of cells before and after shipment, reducing the amount of unpacking, simplifying troubleshooting, and saving costs.

[0111] Optionally, when the material roll comes off the production line at each process, the manufacturing execution system 10 writes the defect information of the electrode 100 transmitted by the production equipment of each process into the radio frequency identification chip 21, including: The production equipment determines the time when defective data is detected as the time point when the defect occurs.

[0112] The production equipment determines the unwinding length corresponding to the location of the defect on the electrode 100 based on the encoder on the winding or unwinding mechanism at the time when the defect occurs.

[0113] The manufacturing execution system 10 determines the sequence number of the pattern code 80 at the corresponding position based on the unwinding length and the spacing between two adjacent pattern codes 80, and determines the position where the defect occurs based on the unwinding length and the sequence number of the pattern code 80.

[0114] The manufacturing execution system 10 writes the location of the defect, the time of the defect, the type of defect, and the degree of defect into the identification chip. The defect information includes the location of the defect, the type of defect, the degree of defect, and the time of the defect.

[0115] In this embodiment, the time when the detection device detects defective data is defined as the time point at which the defect occurs. By etching a series of consecutive graphic codes 80 on the electrode 100, it is possible to cooperate with the encoder on the unwinding mechanism to accurately determine the location of the defect on the electrode 100.

[0116] Optionally, when the material roll comes off the production line at each process, the manufacturing execution system 10 writes the defect information of the electrode 100 transmitted by the production equipment of each process into the radio frequency identification chip 21, and also includes: The manufacturing execution system 10 determines whether a waste removal operation is required based on the sequence number of the graphic code 80 corresponding to the location where the defect occurred.

[0117] If a waste removal operation is required, the manufacturing execution system 10 determines the cutting length based on the distance between two adjacent graphic codes 80 corresponding to the defective location and the difference in the sequence number, and writes the waste removal operation information and the cutting length into the radio frequency identification chip 21.

[0118] If there is no waste removal operation, the manufacturing execution system 10 writes the information that there is no waste removal operation into the radio frequency identification chip 21.

[0119] This embodiment of the application writes information about whether a waste removal operation has been performed into the RFID chip 21, facilitating direct reading by the first RFID reader / writer 3230 in the next process, improving information reading efficiency, and adapting to the rapid production and data transmission of automated production lines. When a waste removal operation occurs at a corresponding defective location in the previous process, the cutting length can also be determined based on the sequence number of two adjacent graphic codes 80 at the cutting location and written into the RFID chip 21. This ensures the accuracy of subsequent information reading and writing.

[0120] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0121] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0122] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0123] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0124] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. An electrode traceability system, characterized in that, include: Production equipment is located in each process, and each piece of production equipment is equipped with a detection device. The detection device is used to generate detection data information of the electrode sheet, and the detection data information includes defect information. The manufacturing execution system is communicatively connected to the production equipment in each process step; An identification tag is installed on a roll used to carry the electrode sheet. The identification tag includes a radio frequency identification chip, which stores unique identification information of the roll including the electrode sheet and the roll, logistics information, and defect information of the electrode sheet. At least one radio frequency (RF) read / write device is provided in each process and between at least one of two adjacent processes. The radio frequency identification (RFID) management system is communicatively connected to the manufacturing execution system and the RFID reader / writer.

2. The electrode traceability system according to claim 1, characterized in that, The radio frequency read / write device includes: At least one logistics gate, containing a radio frequency sensor, is located between two adjacent processes to generate logistics information corresponding to the unique identifier of the material roll. The logistics information includes the transfer time information and the transfer location information.

3. The electrode traceability system according to claim 1, characterized in that, The radio frequency reading and writing device includes a first radio frequency reading and writing device; The first radio frequency reading and writing device is installed at the online workstation of each production equipment and is communicatively connected to the radio frequency identification management system. It is used to generate online time information corresponding to the unique identification information of the material roll. The logistics information also includes the online time information.

4. The electrode traceability system according to claim 1, characterized in that, The radio frequency read / write device also includes: The second radio frequency reading and writing device is set at the off-line station of the slitting process and is used to read the unique identification information in the radio frequency identification chip of the slitting sub-rolls based on radio frequency. The manufacturing execution system is used to associate the unique identification information of each sub-roll after slitting with the unique identification information in the RFID chip on the original mother roll before slitting.

5. The electrode traceability system according to claim 1, characterized in that, Also includes: The coding device is communicatively connected to the manufacturing execution system and is installed in the coating process. The coding device is used to sequentially code on the electrode during the forward movement of the electrode to form at least two graphic codes, each of which contains unique graphic information. There is at least one code reading device, which is communicatively connected to the manufacturing execution system and is set after the coding device in the coating process, in at least one of the rolling process and the slitting process. It is used to read the graphic information of each graphic code in sequence. The preceding processes include the coating process, the rolling process and the slitting process. Each graphic code has a unique and consecutively arranged serial number according to the coding order, and the graphic code is bound to the detection data information of the corresponding segment on the electrode.

6. The electrode traceability system according to claim 5, characterized in that, The production equipment in the preceding process includes an unwinding mechanism and a winding mechanism. An encoder is provided on the unwinding mechanism or the winding mechanism. The encoder is electrically connected to the controller of the corresponding production equipment. The controller is used to determine the unwinding length of the electrode sheet based on the data of the encoder when defective data is detected. The manufacturing execution system is used to determine the sequence number of the graphic code at the corresponding position based on the unwinding length and the spacing between two adjacent graphic codes; The location of the defect is determined by combining the sequence number of the encoder and the graphic code. The adverse information includes at least the type of adverseity, the location of the adverseity, the degree of the adverseity, and the time when the adverseity occurred.

7. The electrode traceability system according to claim 6, characterized in that, The unique identification information of each roll of material is bound to the broken strip location information and broken strip length information on the electrode sheet. The broken strip location information is determined based on whether the sequence numbers of two adjacent graphic codes are consecutive, and the broken strip length information is determined based on the spacing between each two adjacent graphic codes. The manufacturing execution system is also used to determine whether there is a cutting and waste removal operation corresponding to the location where the defect occurred. The radio frequency identification chip also stores information on whether there is a cutting and waste removal operation on the electrode and the cutting length corresponding to each cutting and waste removal operation.

8. The electrode traceability system according to claim 5, characterized in that, Also includes: A color mark sensor is electrically connected to the production equipment of the rolling process. The color mark sensor is used to monitor the colored marks on the electrode sheet. The production equipment is used to determine the rolled area and the unrolled area on the electrode sheet based on the color mark sensor.

9. The electrode traceability system according to claim 5, characterized in that, Also includes: The electrode has a plurality of consecutive graphic codes on it, and the spacing between any two adjacent graphic codes is equal.

10. The electrode traceability system according to claim 9, characterized in that, The coding device includes two laser heads arranged symmetrically in a coating device. The two laser heads are used to form engraved graphic codes on the electrode sheet. The graphic codes are located in the coating area, foil area, or insulating layer of the electrode sheet.

11. The electrode traceability system according to claim 6, characterized in that, Along the direction of electrode movement, the coding device is located behind the oven in the coating process, and the graphic code is engraved on the front of the electrode. The code reading device is installed before the winding mechanism of at least one of the coating process, rolling process, and slitting process, and is used to sequentially read the graphic information of each graphic code on the front side of the electrode sheet after reverse coating and drying.

12. The electrode traceability system according to claim 5, characterized in that, The plurality of pattern codes on the electrode sheet include N pattern code cycles, each pattern code cycle including a first pattern code of number 2n and a second pattern code of number n, where n is a positive integer.

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