Die cutting method and equipment, winding method and equipment, and die cutting and winding method and equipment

Abstract

The invention relates to a die cutting method and device, a winding method and device, and a die cutting winding method and device.The method comprises the steps that after a winding drum is placed and a pole piece strip is connected with the bottom of the winding drum, a strip walking mechanism is controlled to pull the pole piece strip to walk; when the tape conveying length is a preset length, controlling a die cutting mechanism to perform die cutting treatment on the pole piece tape so as to obtain a pole piece unit for a normal battery cell; when the tape walking length is the target length, controlling a spraying device to form a spraying mark on the pole piece tape so as to generate a target film roll comprising the spraying mark, so that in the process of winding the target film roll by the winding machine, when the spraying mark is detected by a sensor in the winding machine, the winding machine enters a roll changing mode; the target length is larger than or equal to the winding length needed by the winding machine in the roll changing mode in the shutdown speed reduction process, and the preset length is larger than or equal to the distance between a roll changing cutter and a reference position on the winding drum in the process that the winding machine winds a target film roll.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a die-cutting method and equipment, a winding method and equipment, and a die-cutting and winding method and equipment. Background Art

[0002] Power batteries are a type of power source that provides a source of energy. They offer high energy, high power, safety, and reliability, and are widely used in vehicles, power systems, and other fields. A bare cell is the smallest unit of a battery and is composed of coiled electrodes wrapped around positive and negative electrode film.

[0003] In the prior art, reel change is achieved by detecting the distance to the film roll using an ultrasonic sensor. For example, when the ultrasonic sensor detects that the distance to the film roll is equal to the distance threshold, a reel change alarm is issued, and then the winder starts to slow down and stop to change the roll. However, due to certain differences in the roll diameter, electrode thickness, etc. of different film rolls, it is easy to cause inaccurate detection by the ultrasonic sensor. If the detected reel change timing is earlier than the actual reel change timing (premature reel change), the cutting position in the reel change mode will fall before the end position of the last complete electrode, making the electrode before the cutting position not a complete electrode, and thus cannot be wound into a complete bare cell. Therefore, premature reel change will cause electrode waste.

[0004] Therefore, there is an urgent need for a die-cutting and winding method that can accurately detect the timing of reel change to avoid electrode waste and improve electrode utilization. Summary of the Invention

[0005] The present application provides a die-cutting method and equipment, a winding method and equipment, and a die-cutting and winding method and equipment, which can accurately detect the timing of entering the roll-changing mode, avoid the occurrence of broken rolls and flying tapes, and improve production efficiency.

[0006] In a first aspect, an embodiment of the present application provides a die-cutting method, the method comprising:

[0007] After placing the reel and connecting the pole piece strip to the bottom of the reel, control the tape mechanism to pull the pole piece strip along;

[0008] When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells;

[0009] When the tape running length is the target length, the spraying device is controlled to form a spray mark on the electrode tape to generate a target film roll including the spray mark, so that when the winder is winding the target film roll, the winder enters the roll changing mode when the spray mark is detected by the sensor in the winder; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll when the winder is winding the target film roll, and the reference position is the position of the bottom of the roll when the winding is stopped.

[0010] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0011] The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0012] In a second aspect, an embodiment of the present application provides a die-cutting device, the die-cutting device comprising:

[0013] The belt conveyor is used to pull the pole piece material along the belt;

[0014] Die-cutting mechanism, used for die-cutting the electrode unit used for normal battery cells on the electrode strip;

[0015] A spraying device, used for spraying on the pole piece strip to form a spray mark;

[0016] A control device is used to control the tape mechanism to pull the electrode tape after the reel is placed and the electrode tape is connected to the bottom of the reel;

[0017] When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells;

[0018] When the tape running length is the target length, the spraying device is controlled to form a spray mark on the electrode tape to generate a target film roll including the spray mark, so that when the winder is winding the target film roll, the winder enters the roll changing mode when the spray mark is detected by the sensor in the winder; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll when the winder is winding the target film roll, and the reference position is the position of the bottom of the roll when the winding is stopped.

[0019] In a third aspect, an embodiment of the present application provides a winding method, the method comprising:

[0020] During the process of the winder winding the target film roll, when the spray mark in the target film roll is detected by the sensor in the winder, the winder is controlled to enter the roll-changing mode, and the pole piece length between the position of the spray mark in the target film roll and the bottom of the drum of the target film roll is the target length, and the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll-changing mode;

[0021] In this roll-changing mode, the winder is controlled to stop and decelerate until winding stops, and a preset length of the electrode between the target film roll and the bottom of the roll is not die-cut, and the preset length is greater than or equal to the distance from the roll-changing cutter in the winder to a reference position on the roll, and the reference position is the position of the bottom of the roll when winding stops;

[0022] After the target film roll is replaced with the next film roll, the winder is controlled to enter the winding mode to continue winding.

[0023] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0024] The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0025] In a fourth aspect, an embodiment of the present application provides a winding machine, comprising:

[0026] Sensors for detecting spray marks in the film roll;

[0027] a control device for entering a roll-changing mode when a spray mark in the target film roll is detected by the sensor during the process of winding the target film roll, wherein the length of the pole piece between the position of the spray mark in the target film roll and the bottom of the reel of the target film roll is a target length, and the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll-changing mode;

[0028] In this roll-changing mode, the machine stops and decelerates until winding stops, and a preset length of the electrode between the target film roll and the bottom of the roll is not die-cut. The preset length is greater than or equal to the distance from the roll-changing cutter in the winder to the reference position on the roll, and the reference position is the position of the bottom of the roll when winding stops.

[0029] After the target film roll is replaced with the next film roll, the winding mode is entered to continue winding.

[0030] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0031] The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0032] In a fifth aspect, an embodiment of the present application provides a die-cutting and winding method, the method comprising:

[0033] After placing the reel and connecting the pole piece strip to the bottom of the reel, control the tape mechanism to pull the pole piece strip along;

[0034] When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells;

[0035] When the running length is the target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, wherein the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll during the process of the winder winding the target film roll;

[0036] During the process of winding the target film roll, when the spray mark is detected by the sensor, the roll changing mode is entered;

[0037] In the roll changing mode, the machine stops and decelerates until the winding stops;

[0038] After the target film roll and the next film roll are replaced, the winding mode is entered to continue winding.

[0039] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0040] Among them, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll. The reference position is the position of the bottom of the roll when the winding stops.

[0041] In a sixth aspect, an embodiment of the present application provides a die-cutting and winding device, the device comprising:

[0042] The belt conveyor is used to pull the pole piece material along the belt;

[0043] Die-cutting mechanism, used for die-cutting the electrode unit used for normal battery cells on the electrode strip;

[0044] A spraying device, used for spraying on the pole piece strip to form a spray mark;

[0045] A control device is used to control the tape-feeding mechanism to pull the electrode strip material for tape-feeding after placing the reel and connecting the electrode strip material to the bottom of the reel; when the tape-feeding length is a preset length, control the die-cutting mechanism to perform die-cutting on the electrode strip material to obtain electrode units used for normal battery cells; when the tape-feeding length is a target length, control the spraying device to form a spray mark on the electrode strip material to generate a target film roll including the spray mark, wherein the target length is greater than or equal to the winding length required for the shutdown and deceleration process in the reel-changing mode, and the preset length is greater than or equal to the distance from the reel-changing cutter to the reference position on the reel during the process of the winder winding the target film roll, and the reference position is the position of the bottom of the reel when the winding is stopped;

[0046] Sensors for detecting spray marks in the film roll;

[0047] The control device is also used to enter the roll changing mode when the spray mark is detected by the sensor during the process of winding the target film roll; in the roll changing mode, the machine stops and slows down until the winding stops; after the roll change between the target film roll and the next film roll is completed, the machine enters the winding mode to continue winding.

[0048] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0049] The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0050] In the seventh aspect, an embodiment of the present application provides an electronic device, comprising: a processor, wherein the processor is used to execute a computer program stored in a memory, wherein when the computer program is executed by the processor, the steps of any one of the die-cutting methods provided in the first aspect are implemented, or the steps of any one of the winding methods provided in the third aspect are implemented, or the steps of the die-cutting and winding method provided in the fifth aspect are implemented.

[0051] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the steps of any one of the die-cutting methods provided in the first aspect, or implements the steps of any one of the winding methods provided in the third aspect, or implements the steps of the die-cutting and winding method provided in the fifth aspect.

[0052] In the ninth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a computer program or instructions. When the computer program product runs on a processor, the processor executes the computer program or instructions to implement the steps of any one of the die-cutting methods provided in the first aspect, or implement the steps of any one of the winding methods provided in the third aspect, or implement the steps of the die-cutting and winding method provided in the fifth aspect.

[0053] In the tenth aspect, an embodiment of the present application provides a chip, which includes a processor, a memory and a communication interface, the communication interface is coupled to the processor, the memory is used to store programs or instructions that can be run on the processor, and the processor is used to execute the program or instructions to implement the steps of any one of the die-cutting methods provided in the first aspect, or to implement the steps of any one of the winding methods provided in the third aspect, or to implement the steps of the die-cutting and winding method provided in the fifth aspect.

[0054] The technical solution provided by the embodiment of the present application has the following advantages over the prior art: in the embodiment of the present application, after placing the reel and connecting the electrode strip to the bottom of the reel, the tape-feeding mechanism is controlled to pull the electrode strip for tape-feeding; when the tape-feeding length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode strip to obtain a electrode unit used for a normal battery cell; when the tape-feeding length is a target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, so that when the winder winds the target film roll, the winder enters a roll-changing mode when the spray mark is detected by a sensor in the winder; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll-changing mode, and the preset length is greater than or equal to the distance from the roll-changing cutter to the reference position on the reel when the winder winds the target film roll, and the reference position is the position of the bottom of the reel when winding stops. In this way, on the one hand, in order to effectively utilize the last electrode unit in the film roll during the roll changing process and generate a complete bare battery cell, it is set that when the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode strip, thereby reserving enough electrode length that is wasted when changing the roll and splicing the tape. On the other hand, compared with detecting the distance from the film roll by the ultrasonic sensor, spraying a spray mark on the electrode strip during the die-cutting process, and then detecting the spray mark by the sensor during the winding process, can more accurately detect the timing of the roll changing. Furthermore, by setting the die-cutting process from the start of the tape mechanism to the target tape length, spraying to form a spray mark, and the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, after the spray mark is detected and the roll changing mode is entered, the winding length of the winder during the stop and deceleration process will not exceed the electrode length between the spray mark and the bottom of the roll, so that the cutting position will fall at the position where the die-cutting starts or the position where the die-cutting is not performed, thereby avoiding electrode waste and improving the utilization rate of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0056] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0057] Figure 1 A schematic diagram of the structure of a winding machine provided in this application;

[0058] Figure 2A schematic diagram of the partial structure of a bare battery cell provided in this application;

[0059] Figure 3 A schematic diagram of a membrane roll structure provided in this application;

[0060] Figure 4 A schematic diagram of a die-cutting method provided in this application;

[0061] Figure 5 A schematic diagram of the working state of a die-cutting device and a pole piece provided in this application;

[0062] Figure 6 A schematic structural diagram of a die-cutting device provided in this application;

[0063] Figure 7 A schematic diagram of a winding method provided in this application;

[0064] Figure 8 A schematic structural diagram of a winding machine provided in this application;

[0065] Figure 9 A schematic flow chart of a die-cutting and winding method provided in this application;

[0066] Figure 10 A schematic structural diagram of a die-cutting and winding device provided in this application;

[0067] Figure 11 A schematic diagram of the hardware structure of an electronic device provided in this application. DETAILED DESCRIPTION

[0068] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0069] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0070] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "first," "second," and the like generally distinguish objects of a class and do not limit the number of objects. For example, the first object may be one or more.

[0071] First, some nouns or terms involved in the claims and description of the embodiments of this application are explained below.

[0072] Lithium-ion battery: Lithium-ion battery mainly relies on the movement of lithium ions between the positive and negative electrodes to work.

[0073] Winding machine: In the production process of lithium-ion batteries, one of the most common equipment is the winding machine. Currently, lithium-ion battery winding machines are all fully automatic and driven by AC servo motors. The pole pieces and diaphragms are transported to the winding needles through several rollers arranged on the wall panels for winding.

[0074] Bare cell: A primary semi-finished product for lithium-ion batteries. A bare cell consists of a positive electrode sheet 1, a first separator 3, a negative electrode sheet 2, and a second separator 4 stacked and wound in sequence, with adhesive tape applied at the ends. In the manufacturing cost of a bare cell, the positive electrode sheet>>negative electrode sheet>>separator.

[0075] Film rolls: Semi-finished products for bare lithium-ion battery cells, including positive and negative electrode film rolls, are made by winding several complete positive and negative electrode sheets onto a reel for fully automated winding. Film rolls are also called electrode sheet film rolls.

[0076] The roll changing mode means that after the winder detects the time to change the roll, it stops and starts to slow down until the winding stops, and then cuts and changes the roll.

[0077] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charge and discharge process, Li+ is intercalated and deintercalated between the two electrodes. During charging, Li+ is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. In the production process of lithium-ion batteries, one of the commonly used equipment is the winding machine. The winding machine structure is shown in the attached figure. Figure 1 As shown, the current lithium-ion battery winding machines are all fully automatic, driven by AC servo motors, and the pole pieces are sent to the winding needles through several rollers arranged on the wall panels for winding. The lithium-ion battery semi-finished products formed by winding the winding machine are called bare cells. Figure 1 ,like Figure 2 As shown, a bare cell is composed of a positive electrode sheet 1, a first separator 3, a negative electrode sheet 2, and a second separator 4, stacked and wound in sequence, with adhesive tape applied to the ends. The manufacturing cost of a bare cell is higher, or significantly higher, than that of the positive electrode sheet, which is higher, or significantly higher than that of the negative electrode sheet. For example, a bare cell with a square aluminum shell is made by winding the positive and negative electrode sheets stored in a roll.

[0078] like Figure 3For the film roll shown, the position indicated by the mark "3C" is the cutting position before the last roll change of the winding machine, and the position indicated by the mark "3B" is the end position of a complete electrode. The position indicated by the mark "3A" is the bottom of the roll of the film roll, and the area between the marks "3A" and "3B" is the electrode at the bottom of the roll used for roll change and splicing (hereinafter referred to as "3A-3B"). When designing, it is hoped that the cutting position before roll change (i.e., the position indicated by the mark "3C" in the figure) falls at the position indicated by the mark "3B" or after the position indicated by the mark "3B", i.e., within the mark "3A-3B". However, the existing technology has the problem that the roll change timing (the timing of entering the roll change mode) cannot be accurately detected when the positive and negative film rolls are changed (one film roll ends and the next film roll is replaced). If the detected roll-changing timing is later than the actual roll-changing timing (failure to change the roll in time), if the position indicated by the mark "3A" has been reached before the roll-changing, the winder has not stopped and is still winding, so there is no time to cut and change the roll. Failure to change the roll in time will cause the broken roll to fly, and the broken roll flying tape needs to be manually re-connected and threaded, which wastes time and affects the winding efficiency. If the detected roll-changing timing is earlier than the actual roll-changing timing (changing the roll in advance), the cutting position before the roll-changing (i.e., the position indicated by the mark "3C" in the figure) will fall before the position indicated by the mark "3B", that is, it will not fall between "3A-3B", so that the electrode before the roll-changing cutting is not a complete electrode (because the position indicated by the mark "3B" is the end position of a electrode), and it cannot be wound into a complete bare battery cell. Therefore, changing the roll in advance will cause electrode waste. Accurately identifying the roll-changing timing and changing the roll (entering the roll-changing mode) is particularly important. Because the winder has many rollers and a long storage area, it increases the difficulty of accurately identifying the roll-changing timing.

[0079] In the prior art, reel changes are achieved by detecting the distance to the film roll using an ultrasonic sensor. For example, when the ultrasonic sensor detects that the distance to the film roll is equal to a distance threshold, a reel change alarm is issued, and the winder enters reel change mode, stops, and begins to decelerate until winding stops, executing the reel change process. However, due to certain differences in the roll diameter and electrode thickness of different film rolls, the distance threshold is difficult to set, or because the ultrasonic sensor itself has low detection accuracy, the ultrasonic sensor's accuracy in detecting the reel change timing is low. If the detected reel change timing is later than the actual reel change timing (failure to change the roll in time), the film roll has reached the bottom of the reel (the point where the electrode and the reel are connected) before the winder stops winding, which may cause the reel to break and fly. The broken reel flying tape needs to be manually re-threaded and re-threaded, which is very time-consuming. If the detected reel change timing is earlier than the actual reel change timing (premature reel change), the film roll has not reached the bottom of the reel when the winder stops winding, and the cut position falls before the end position of the last electrode, resulting in electrode waste. Normally, in order to avoid breakage and flying tape, the distance threshold is set too small, that is, when the winder stops winding, the film roll still has a long distance to reach the bottom of the drum, which results in a large amount of waste of electrodes.

[0080] The present application is applied to the production scenario of lithium-ion batteries. The lithium-ion batteries produced in the embodiments of the present application can be used in vehicles, etc. The specific application can be determined based on actual conditions and is not limited here.

[0081] The technical solution of this application is explained in detail below through several specific embodiments.

[0082] Figure 4 This is a flow chart of a die-cutting method provided by this application. The execution subject of the die-cutting method can be a die-cutting device or a functional module or functional entity in the die-cutting device that can implement the die-cutting method. Figure 4 As shown, the die-cutting method may include the following steps 401 to 403.

[0083] 401. After placing the reel and connecting the electrode strip to the bottom of the reel, control the tape mechanism to pull the electrode strip to move.

[0084] Among them, after placing the reel, the electrode tape is connected to the bottom of the reel with tape, and then the tape transport mechanism is started, and the tape transport mechanism begins to pull the electrode tape.

[0085] 402. When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells.

[0086] After the tape transport mechanism is activated, the die-cutting mechanism can be activated to begin die-cutting the electrode strip to obtain electrode units for normal battery cells. A die-cut film roll contains multiple electrode units, each of which is used to be wound by the winding equipment to produce a bare battery cell.

[0087] 403. When the running length is the target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, so that when the winder is winding the target film roll, the winder enters the roll changing mode when the spray mark is detected by the sensor in the winder.

[0088] Among them, the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll during the process of the winder winding the target film roll. The reference position is the position of the bottom of the roll when the winding stops.

[0089] When the tape length reaches the target length, the spraying device is started to spray, and the spraying device is controlled to work for a certain period of time to generate a spray mark. The spray material used by the spraying device is not limited in this embodiment of the application and can be determined according to actual conditions. In this embodiment of the application, the spray mark is generally formed on the last electrode unit of the film roll, and the spray mark does not affect the use of the electrode unit, that is, the position of the electrode unit where the spray mark exists can be used normally.

[0090] It can be understood that setting the target length greater than or equal to the winding length required for the winder to stop and decelerate in the roll-changing mode can ensure that the film roll does not reach the bottom of the roll during the deceleration process from the winder entering the roll-changing mode to stopping winding, and will not cause the roll to break and fly.

[0091] It can be understood that the spray mark is located at a fixed position in the film roll, and the sensor's detection of the spray mark is not affected by the electrode thickness, roll diameter, etc., and the sensor has a high sensitivity in detecting the spray mark. Therefore, the accuracy of the sensor in detecting the spray mark is usually higher than the accuracy of the ultrasonic sensor in detecting the distance.

[0092] The preset length is greater than or equal to the distance between the roll change cutter and the reference position on the roll during the winding process of the target film roll. The reference position is the position of the roll bottom when the winding stops, that is, the reference position is the position of the roll bottom when the target film roll is wound to the roll bottom. In other words, the reference position is the position of the roll bottom when there are no more electrode sheets in the target film roll.

[0093] The reference position may be the center of the roll, the position on the roll closest to the first roller (the roller closest to the roll), or any other position. The specific position may be determined based on actual conditions and is not limited here.

[0094] The pole piece of the preset length is usually used for rewinding and splicing, and the length is generally 1-2 meters.

[0095] It can be understood that when the tape length is the preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode strip, and the position where die-cutting starts is the end position of the last electrode unit in the film roll during the winding process. The distance between the roll-changing cutter and the reference position on the reel is the minimum length for changing the tape. Therefore, setting the preset length greater than or equal to the distance between the roll-changing cutter and the reference position on the reel during the process of the winder winding the target film roll can effectively ensure that the last electrode unit in the film roll can be effectively utilized.

[0096] For example, Figure 5 As shown, "a" in the figure corresponds to the preset length, and "b" in the figure corresponds to the target length.

[0097] In an embodiment of the present application, in order to effectively utilize the last electrode unit in the film roll during the roll changing process to generate a complete bare battery cell, it is set to control the die-cutting mechanism to perform die-cutting on the electrode tape when the tape length is a preset length. In this way, the electrode length that is wasted in the roll changing and splicing is reserved, which can effectively reduce the waste rate of the electrode of the film roll.

[0098] In the embodiment of the present application, when the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode strip, and when the tape length is a target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark. On the one hand, in order to effectively utilize the last electrode unit in the film roll during the roll change process and generate a complete bare battery cell, it is set to control the die-cutting mechanism to perform die-cutting on the electrode strip when the tape length is a preset length, thereby reserving enough electrode length that is wasted for roll change and splicing. On the other hand, compared with detecting the distance to the film roll by the ultrasonic sensor, the electrode strip is detected during the die-cutting process. The spraying marks are formed on the material, and then the spraying marks are detected by the sensor during the winding process, which can more accurately detect the timing of changing the roll. Furthermore, by setting the die-cutting process from the start of the tape walking mechanism to the tape walking target length, the spraying marks are formed, and the target length is greater than or equal to the winding length required for the shutdown and deceleration process of the winder in the roll changing mode, so that after the spray mark is detected and the roll changing mode is entered, the winding length of the winder during the shutdown and deceleration process will not exceed the length of the electrode between the spray mark and the bottom of the roll, so that the cutting position will fall at the starting position of die cutting or the position without die cutting, thereby avoiding the waste of the electrode and improving the utilization rate of the electrode.

[0099] In the embodiment of the present application, compared with detecting the distance from the film roll through an ultrasonic sensor, a spray mark is sprayed on the electrode strip during the die-cutting process, and then the spray mark is detected by the sensor during the winding process. The timing of the roll change can be detected more accurately. By setting the die-cutting process from the start of the tape walking mechanism to the target tape walking length, the spray mark is formed by spraying, and the target length is greater than or equal to the winding length required for the shutdown and deceleration process of the winder in the roll changing mode. After the spray mark is detected and the roll changing mode is entered, the winding length of the winder during the shutdown and deceleration process will not exceed the electrode length between the spray mark and the bottom of the roll. Therefore, when the winding is stopped, the film roll has just reached the bottom of the roll or has not yet reached the bottom of the roll. This can avoid the phenomenon of broken rolls and flying tapes, and can improve the production efficiency.

[0100] In some embodiments of the present application, the tape transport mechanism and the die-cutting mechanism can be started at the same time, or the die-cutting mechanism can be started to perform die-cutting after the tape transport mechanism is started and the tape is transported for a preset length. Since a certain amount of pole pieces need to be left when changing rolls, if the remaining pole pieces are also die-cut, and the remaining pole piece part and the pole piece part before the cutting position belong to the same pole piece unit, then the pole piece part before the cutting position cannot be used to generate a complete bare cell and will therefore be wasted. Therefore, after the tape transport mechanism is started and the tape is transported for a preset length, the die-cutting mechanism can be started to perform die-cutting, which can ensure that the cutting position during the roll change does not fall on the pole piece unit used for the last normal cell of the film roll. In this way, the pole piece part before the cutting position can be a complete pole piece unit, which can be used to generate a complete bare cell, thereby reducing pole piece waste and improving the pole piece utilization rate of the film roll.

[0101] In some embodiments of the present application, the target length is the sum of the winding length and the target distance; wherein, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0102] Understandably, in practice, the sensor is often a certain distance from the bottom of the reel. Therefore, to prevent breakage and flying tape, the target length is set to the sum of the required winding length during the winder's stop and deceleration process in reel-changing mode, and the distance between the spray mark's location and the reference position on the reel when the sensor detects the spray mark during the winder's winding of the target film roll. This prevents breakage and flying tape while minimizing film electrode waste.

[0103] It should be noted that the processes of die-cutting the positive electrode film roll and die-cutting the negative electrode film roll can both be implemented according to the above-mentioned die-cutting method.

[0104] like Figure 6As shown, the embodiment of the present application provides a die-cutting device, which includes: a tape transport mechanism 601 for pulling the electrode strip to travel; a die-cutting mechanism 602 for die-cutting the electrode unit used for normal battery cells on the electrode strip; a spraying device 603 for spraying on the electrode strip to form a spray mark; a control device 604 for controlling the tape transport mechanism to pull the electrode strip to travel after placing the reel and connecting the electrode strip to the bottom of the reel; when the tape transport length is a preset length, controlling the die-cutting mechanism to perform die-cutting on the electrode strip to obtain the electrode unit used for normal battery cells ; When the tape running length is the target length, the spraying device is controlled to form a spray mark on the electrode tape to generate a target film roll including the spray mark, so that in the process of the winder winding the target film roll, when the spray mark is detected by the sensor in the winder, the roll changing mode is entered; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll in the process of the winder winding the target film roll, and the reference position is the position of the bottom of the roll when the winding stops.

[0105] In some embodiments of the present application, the target length is the sum of the winding length and the target distance; wherein, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0106] It should be noted that the specific description of the die-cutting equipment can refer to the specific description of the die-cutting method mentioned above. The various modules of the die-cutting equipment can implement the die-cutting method provided by the above method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0107] Figure 7 This is a flow chart of a winding method provided by the present application. The execution subject of the winding method can be a winding machine or a functional module or functional entity in the winding machine that can implement the winding method. Figure 7 As shown, the winding method may include the following steps 701 to 703.

[0108] 701. During a process of a winder winding a target film roll, when a spray mark in the target film roll is detected by a sensor in the winder, the winder is controlled to enter a roll-changing mode.

[0109] Among them, the pole piece length between the position of the spray mark in the target film roll and the bottom of the roll of the target film roll is the target length, and the target length is greater than or equal to the winding length required for the shutdown and deceleration process of the winding machine in the roll changing mode.

[0110] 702. In the roll changing mode, the winding machine is controlled to stop and decelerate until the winding stops.

[0111] Among them, the electrode of the preset length between the target film roll and the bottom of the roll is not die-cut, and the preset length is greater than or equal to the distance from the roll-changing cutter in the winding machine to the reference position on the roll. The reference position is the position of the bottom of the roll when the winding is stopped.

[0112] 703. After the target film roll is replaced with the next film roll, the winding machine is controlled to enter the winding mode to continue winding.

[0113] In some embodiments of the present application, after entering roll change mode, the front desk of the device prompts to manually change rolls (manual roll change mode) or enter the automatic roll change program (automatic roll change mode). If in manual roll change mode, the delivery personnel are notified to manually change rolls and splice tapes. If in automatic roll change mode, the automatic roll change device performs the change and splicing. After the reel is changed and the splicing tape is completed, the winder starts and enters the winding mode to continue winding, and generates bare cells one by one according to the mode of winding to a fixed length and cutting. After generating the last bare cell of the previous film roll (identifying the electrode that has not been die-cut), it enters the single roll mode (in single roll mode, other electrodes and diaphragms are not wound together, only the current film roll is wound), the winder continues to wind the electrode part of the target film roll that has not been die-cut, and the electrode part of the next film roll that has not been die-cut, and then scraps them. Then, when the electrode part of the next film roll that has been die-cut is identified, the normal winding process for the next film roll is started, and generates bare cells one by one according to the mode of winding to a fixed length and cutting.

[0114] In the embodiment of the present application, on the one hand, at the splicing position between the target film roll and the next film roll, the electrode between the target film roll and the bottom of the roll is not die-cut, that is, the electrode portion for reel change and splicing is reserved during die-cutting, which can avoid the reel change cutting causing the last electrode portion of the target film roll to be not a complete electrode unit, and unable to generate a complete bare battery cell, thereby causing waste of the film roll electrode. The distance from the reel change cutter to the reference position on the roll is the minimum length for reel change and splicing. Therefore, setting the length of the electrode between the target position and the bottom of the roll to be greater than or equal to the distance from the reel change cutter in the winding machine to the reference position on the roll can effectively ensure that the last electrode unit in the film roll is On the other hand, compared with detecting the distance from the film roll by an ultrasonic sensor, detecting the spray mark by a sensor during the winding process can more accurately detect the timing of the roll change, and by setting the pole piece length between the spray mark and the bottom of the roll (i.e., the target length) to be greater than or equal to the winding length required for the shutdown and deceleration process of the winder in the roll change mode, after the spray mark is detected to enter the roll change mode, the winding length of the winder's shutdown and deceleration process will not exceed the pole piece length between the spray mark and the bottom of the roll, so that when the winding stops, the film roll has just reached the bottom of the roll or has not yet reached the bottom of the roll, thereby avoiding the phenomenon of broken rolls and flying belts, and improving the production efficiency.

[0115] In some embodiments of the present application, the electrode between the target position of the target film roll and the bottom of the roll is not die-cut, and the target position is the splicing position between the target film roll and the next film roll.

[0116] In some embodiments of the present application, the length of the pole piece between the target position and the bottom of the drum is greater than or equal to the distance from the roll-changing cutter in the winding machine to the reference position on the drum.

[0117] The reference position on the roll can be the center of the roll, or the position on the roll closest to the first roller (the roller closest to the roll). The specific position can be determined according to actual conditions and is not limited here.

[0118] In some embodiments of the present application, the target length is the sum of the winding length and the target distance; wherein, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0119] Understandably, in practice, the sensor is often a certain distance from the bottom of the reel. Therefore, to prevent breakage and flying tape, the target length is set to the sum of the required winding length during the winder's stop and deceleration process in reel-changing mode, and the distance between the spray mark's location and the reference position on the reel when the sensor detects the spray mark during the winder's winding of the target film roll. This prevents breakage and flying tape while minimizing film electrode waste.

[0120] It should be noted that the process of winding the positive electrode film roll to generate a bare battery cell and the process of winding the negative electrode film roll to generate a bare battery cell can both be achieved according to the above-mentioned winding method.

[0121] like Figure 8 As shown, an embodiment of the present application provides a winding machine, which includes: a sensor 801 for detecting a spray mark in a film roll; a control device 802 for entering a roll-changing mode when a spray mark in the target film roll is detected by a sensor during the process of winding a target film roll, and the length of the pole piece between the position of the spray mark in the target film roll and the bottom of the roll of the target film roll is a target length, and the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll-changing mode; in the roll-changing mode, the machine stops and decelerates until the winding is stopped, and the pole piece of a preset length between the target film roll and the bottom of the roll is not die-cut, and the preset length is greater than or equal to the distance from the roll-changing cutter in the winder to a reference position on the roll, and the reference position is the position of the bottom of the roll when the winding is stopped; after the roll-changing of the target film roll and the next film roll is completed, the winding mode is entered to continue winding.

[0122] For example, the winding machine generally includes a winding needle, a pole piece cutter, two sensors (one for detecting the spray mark on the positive electrode film roll, and the other for detecting the spray mark on the negative electrode film roll) and a roll-changing cutter, etc. The specific ones can be determined according to actual conditions and are not limited here.

[0123] In some embodiments of the present application, the target length is the sum of the winding length and the target distance; wherein, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of winding the target film roll.

[0124] It can be understood that when the sensor is facing the bottom of the roll, the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark is 0, and the target length is the winding length required for the shutdown and deceleration process in the roll changing mode; when the sensor is not facing the bottom of the roll, the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark is not 0, and the target length is the winding length required for the shutdown and deceleration process in the roll changing mode, and the sum of the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of winding the target film roll.

[0125] In the embodiment of the present application, the specific description of the winding machine can refer to the specific description of the winding method mentioned above. The various modules of the winding machine can implement the winding method provided by the above method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0126] The winding machine system provided in the embodiment of the present application sprays a mark at the end of the film roll. When the film roll on the winder is almost used up, the sensor can accurately identify the spray mark to accurately identify the roll change time, enter the roll change mode, and accurately switch to the spare film roll by changing the roll and splicing the tape. This can avoid the problem of broken rolls and flying tapes caused by insufficient tail material, which requires manual rethreading, thereby improving production efficiency. It can also avoid the part before the cut position of the roll change being not a complete electrode unit, and thus cannot be wound into a complete battery cell, resulting in material scrapping, which can improve the utilization rate of the electrode.

[0127] The embodiment of the present application uses a method of spraying marks on the electrode to distinguish it from the yellow tape of bad products (the part with the yellow tape of bad products is considered waste by default and cannot be used). This can reduce the misjudgment of the timing of changing the roll, and the electrode part at the position of the spray mark can be used normally, avoiding waste of the electrode.

[0128] The embodiment of the present application effectively solves the problems of high production cost and low production efficiency of lithium-ion batteries caused by electrode rewinding. By adopting the method of using electrode spray marking to determine the timing of rewinding and entering the rewinding mode, it can effectively reduce the scrapping of positive and negative electrodes, reduce the cost of winding materials, and effectively avoid the occurrence of broken reels and flying tapes, which can effectively improve production efficiency.

[0129] Figure 9 This is a flow chart of a die-cutting and winding method provided in this application. The execution subject of the die-cutting and winding method can be a functional module or functional entity in a die-cutting and winding machine that can implement the die-cutting and winding method. Figure 9 As shown, the winding method may include steps 901 to 906 described below.

[0130] 901. After placing the reel and connecting the electrode strip to the bottom of the reel, control the tape mechanism to pull the electrode strip to move.

[0131] 902. When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells.

[0132] 903. When the tape running length reaches the target length, control the spraying device to form a spray mark on the electrode tape to generate a target film roll including the spray mark.

[0133] Among them, the target length is greater than or equal to the winding length required for the shutdown and deceleration process in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll during the process of the winder winding the target film roll. The reference position is the position of the bottom of the roll when the winding stops.

[0134] 904. During the process of winding the target film roll, when the spray mark is detected by the sensor, the roll changing mode is entered.

[0135] 905. In the roll changing mode, the machine is stopped and decelerated until the winding stops.

[0136] 906. After the target film roll and the next film roll are replaced, the winding mode is entered to continue winding.

[0137] In some embodiments of the present application, the target length is the sum of the winding length and the target distance; wherein, the target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0138] In the embodiments of the present application, the specific description of the die-cutting and winding method can refer to the above-mentioned specific description of the die-cutting method and the winding method, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0139] like Figure 10As shown, the embodiment of the present application also provides a die-cutting and winding device, which includes: a tape transport mechanism 1001 for pulling the electrode strip to transport; a die-cutting mechanism 1002 for die-cutting the electrode unit used for normal battery cells on the electrode strip; a spraying device 1003 for spraying on the electrode strip to form a spray mark; a control device 1004 for controlling the tape transport mechanism to pull the electrode strip to transport after placing the reel and connecting the electrode strip to the bottom of the reel; when the tape transport length is a preset length, controlling the die-cutting mechanism to perform die-cutting on the electrode strip to obtain the electrode unit used for normal battery cells; when the tape transport length is a target length, controlling the spraying device to form a spray mark on the electrode strip to generate The target film roll including the spray mark, the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll changing mode, the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll during the process of the winder winding the target film roll, and the reference position is the position of the bottom of the roll when the winding stops; the sensor 1005 is used to detect the spray mark in the film roll; the control device 1004 is also used to enter the roll changing mode when the spray mark is detected by the sensor during the process of winding the target film roll; in the roll changing mode, the machine stops and decelerates until the winding stops; after the roll change between the target film roll and the next film roll is completed, the winding mode is entered to continue winding.

[0140] In some embodiments of the present application, the target length is the sum of the winding length and the target distance;

[0141] The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

[0142] In the embodiments of the present application, the specific description of the die-cutting and winding equipment can refer to the specific description of the die-cutting method and the winding method mentioned above. The various modules of the die-cutting and winding equipment can implement the die-cutting method and the winding method provided in the above method embodiments, and can achieve the same technical effect. To avoid repetition, they will not be repeated here.

[0143] like Figure 11 As shown, an embodiment of the present application further provides an electronic device 1100, which can be the above-mentioned electronic device or server. The electronic device 1100 includes: a processor 1101, a memory 1102, and a computer program stored in the memory 1102 and executable on the processor 1101. When the computer program is executed by the processor 1101, it implements the various processes performed by the above-mentioned die-cutting method or winding method, and can achieve the same technical effects. To avoid repetition, it is not further described here.

[0144] An embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the various processes of the above-mentioned die-cutting method or winding method and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0145] The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0146] The present invention provides a computer program product, comprising: when the computer program product is run on a computer, the computer is enabled to implement the above-mentioned die-cutting method or winding method.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0148] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A die-cutting method, characterized in that: The method comprises: After placing the reel and connecting the pole piece strip to the bottom of the reel, control the tape mechanism to pull the pole piece strip along; When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells; When the running length is the target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, so that when the winder is winding the target film roll, the winder enters the roll changing mode when the spray mark is detected by the sensor in the winder; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll when the winder is winding the target film roll, and the reference position is the position of the bottom of the roll when the winding is stopped.

2. The method according to claim 1, characterized in that The target length is the sum of the winding length and the target distance; The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

3. A die-cutting device, characterized in that: The die-cutting equipment includes: The belt conveyor is used to pull the pole piece material along the belt; Die-cutting mechanism, used for die-cutting the electrode unit used for normal battery cells on the electrode strip; A spraying device, used for spraying on the pole piece strip to form a spray mark; A control device is used to control the tape mechanism to pull the electrode tape after the reel is placed and the electrode tape is connected to the bottom of the reel; When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells; When the running length is the target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, so that when the winder is winding the target film roll, the winder enters the roll changing mode when the spray mark is detected by the sensor in the winder; the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll when the winder is winding the target film roll, and the reference position is the position of the bottom of the roll when the winding is stopped.

4. A winding method, characterized in that: The method comprises: During the process of the winder winding the target film roll, when the spray mark in the target film roll is detected by the sensor in the winder, the winder is controlled to enter the roll-changing mode, and the pole piece length between the position of the spray mark in the target film roll and the bottom of the roll drum of the target film roll is the target length, and the target length is greater than or equal to the winding length required for the winder to stop and decelerate in the roll-changing mode; In the roll-changing mode, the winder is controlled to stop and decelerate until the winding stops, and a preset length of the electrode between the target film roll and the bottom of the roll is not die-cut, and the preset length is greater than or equal to the distance from the roll-changing cutter in the winder to a reference position on the roll, and the reference position is the position of the bottom of the roll when the winding stops; After the target film roll is replaced with the next film roll, the winder is controlled to enter a winding mode to continue winding.

5. The method according to claim 4, characterized in that The target length is the sum of the winding length and the target distance; The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of the winder winding the target film roll.

6. A winding machine, characterized in that: The winding machine comprises: Sensors for detecting spray marks in the film roll; a control device for entering a roll-changing mode when a spray mark in the target film roll is detected by the sensor during the process of winding the target film roll, wherein the length of the pole piece between the position of the spray mark in the target film roll and the bottom of the reel of the target film roll is a target length, and the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll-changing mode; In the roll-changing mode, the machine is stopped and decelerated until winding stops, and a preset length of the electrode between the target film roll and the bottom of the roll is not die-cut, and the preset length is greater than or equal to the distance from the roll-changing cutter in the winder to a reference position on the roll, and the reference position is the position of the bottom of the roll when winding stops; After the target film roll and the next film roll are replaced, the winding mode is entered to continue winding.

7. A die-cutting and winding method, characterized in that: The method comprises: After placing the reel and connecting the pole piece strip to the bottom of the reel, control the tape mechanism to pull the pole piece strip along; When the tape length is a preset length, the die-cutting mechanism is controlled to perform die-cutting on the electrode tape to obtain electrode units used for normal battery cells; When the running length is the target length, the spraying device is controlled to form a spray mark on the electrode strip to generate a target film roll including the spray mark, wherein the target length is greater than or equal to the winding length required for the stop and deceleration process in the roll changing mode, and the preset length is greater than or equal to the distance from the roll changing cutter to the reference position on the roll during the process of winding the target film roll, wherein the reference position is the position of the bottom of the roll when the winding is stopped; During the process of winding the target film roll, when the spray mark is detected by the sensor, the roll changing mode is entered; In the roll changing mode, the machine stops and decelerates until the winding stops; After the target film roll and the next film roll are replaced, the winding mode is entered to continue winding.

8. The method according to claim 7, characterized in that The target length is the sum of the winding length and the target distance; The target distance is the distance between the position of the spray mark and the reference position on the roll when the sensor detects the spray mark during the process of winding the target film roll.

9. A die-cutting and winding device, characterized in that: The device comprises: The belt conveyor is used to pull the pole piece material along the belt; Die-cutting mechanism, used for die-cutting the electrode unit used for normal battery cells on the electrode strip; A spraying device, used for spraying on the pole piece strip to form a spray mark; A control device is used to control the tape-feeding mechanism to pull the electrode strip material for tape-feeding after placing the reel and connecting the electrode strip material to the bottom of the reel; when the tape-feeding length is a preset length, control the die-cutting mechanism to perform die-cutting on the electrode strip material to obtain electrode units used for normal battery cells; when the tape-feeding length is a target length, control the spraying device to form a spray mark on the electrode strip material to generate a target film roll including the spray mark, wherein the target length is greater than or equal to the winding length required for the shutdown and deceleration process in the reel-changing mode, and the preset length is greater than or equal to the distance from the reel-changing cutter to the reference position on the reel during the process of winding the target film roll, and the reference position is the position of the bottom of the reel when the winding is stopped; Sensors for detecting spray marks in the film roll; The control device is also used to enter the roll changing mode when the spray mark is detected by the sensor during the process of winding the target film roll; in the roll changing mode, the machine stops and slows down until the winding stops; after the roll change between the target film roll and the next film roll is completed, the machine enters the winding mode to continue winding.

10. An electronic device, characterized in that: include: A processor, the processor being configured to execute a computer program stored in a memory, wherein the computer program, when executed by the processor, implements the die-cutting method of claim 1 or 2, or the steps of the winding method of claim 4 or 5, or the steps of the die-cutting and winding method of claim 7 or 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the die-cutting method according to claim 1 or 2, or the steps of the winding method according to claim 4 or 5, or the steps of the die-cutting and winding method according to claim 7 or 8 are implemented.

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