Method, device and roll slitter for detecting tape breakage after slitting by a roll slitter

Abstract

The present invention provides a method, device and roll slitter for detecting broken belts after slitting by the roll slitter, which relates to the technical field of lithium battery production and processing. During the operation of the roll slitter, the present invention detects the position of the lower battery pole piece through an induction sensor. If there is a battery pole piece, continuous real-time detection is carried out, and based on the detection signal detected in real time, it is determined whether the battery pole piece has broken; if the battery pole piece has broken, the roll slitter is controlled to stop. Compared with the traditional tension detection method, the present invention uses the induction sensor detection method to realize broken belt detection, which is not limited by tension, width, pole piece speed and material, realizes accurate detection of broken belts of battery pole pieces under different working conditions, improves the accuracy of broken belt detection of lithium battery pole pieces, and avoids waste of battery pole piece materials.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production and processing, and particularly to a method and device for detecting broken belts after slitting by a roll slitter and a roll slitter. Background Art

[0002] In the lithium battery manufacturing industry, the slitting of battery electrode sheets is one of the key links in the production process, and its quality directly affects the performance and safety of subsequent batteries. The traditional detection method after slitting mainly relies on the detection of winding tension, and judges whether a broken belt occurs by comparing the deviation between the actual tension and the preset tension. However, with the continuous development of lithium battery technology and the diversification of product models, this detection method gradually exposes its limitations.

[0003] First of all, the required tension, width, speed, and material of different models of lithium battery electrode sheets during slitting are different, which makes it difficult for a single tension detection standard to meet the diverse production needs. Especially when using a single slip shaft to wind multiple materials simultaneously, if one of the electrode sheets breaks, since the other materials are still being wound normally, the winding tension detection mechanism may still be able to detect sufficient tension, thus unable to trigger a broken belt alarm in time.

[0004] Secondly, the traditional tension detection method also has deficiencies in response speed and accuracy. When a broken belt occurs, it often takes until the tension change accumulates to a certain extent to be detected, which may lead to a certain length of the material after the broken belt has accumulated, increasing the waste of raw materials and the difficulty of subsequent processing.

[0005] Therefore, the traditional tension detection method has problems of low accuracy and difficult detection, and is difficult to meet the requirements of modern lithium battery production lines. Summary of the Invention

[0006] The present invention provides a method and device for detecting broken belts after slitting by a roll slitter and a roll slitter, which can improve the accuracy of detecting broken belts of lithium battery electrode sheets.

[0007] In a first aspect, the present invention provides a method for detecting broken belts after slitting by a roll slitter, which is applied to a roll slitter. The roll slitter includes a horizontally arranged first over-roll and a second over-roll, and an induction sensor arranged between the first over-roll and the second over-roll. After the battery electrode sheet is slit, it winds around the first over-roll, passes under the induction sensor, and winds around the second over-roll to perform a winding motion. The method includes: obtaining the detection signal of the induction sensor for the position of the lower battery electrode sheet during the operation of the roll slitter; based on the detection signal, determining whether there is a battery electrode sheet at the position of the lower battery electrode sheet; if there is a battery electrode sheet at the position of the lower battery electrode sheet, continuously performing real-time detection on the detection signal, and based on the real-time detected detection signal, determining whether the battery electrode sheet has a broken belt; if the battery electrode sheet has a broken belt, controlling the roll slitter to stop.

[0008] In a possible implementation, the induction sensor is a diffuse reflection sensor; correspondingly, determining whether the battery pole piece has a broken belt based on the detection signal detected in real time includes: determining whether there is a battery pole piece at the position of the lower battery pole piece based on the detection signal detected in real time; if the position of the lower battery pole piece changes from having a battery pole piece to not having a battery pole piece, determining whether the battery pole piece has a broken belt; if the position of the lower battery pole piece has a battery pole piece and remains unchanged, determining that the battery pole piece is being wound normally.

[0009] In a possible implementation, the induction sensor is a distance sensor; correspondingly, determining whether there is a battery pole piece at the position of the lower battery pole piece based on the detection signal includes: determining the real-time distance between the battery pole piece and the distance sensor based on the detection signal; if the real-time distance is less than or equal to a preset distance, determining that there is a battery pole piece at the position of the lower battery pole piece; if the real-time distance is greater than the preset distance, determining that there is no battery pole piece at the position of the lower battery pole piece.

[0010] In a possible implementation, determining whether the battery pole piece has a broken belt based on the detection signal detected in real time includes: determining the real-time distance between the battery pole piece and the distance sensor based on the detection signal detected in real time; if the real-time distance changes from being less than or equal to the preset distance to being greater than the preset distance, determining that the battery pole piece has a broken belt; if the real-time distance is less than or equal to the preset distance and remains unchanged, determining that the battery pole piece is being wound normally.

[0011] In a possible implementation, a winding bobbin is arranged behind the roll slitter, and the battery pole piece is wound by the winding bobbin after passing through the second roller of the roll slitter; a rotation speed sensor is arranged inside the winding bobbin, and a coil diameter detection sensor is arranged outside the winding bobbin; the method further includes: detecting the coil diameter of the battery pole piece outside the winding bobbin through the coil diameter detection sensor; detecting the rotation speed of the winding bobbin through the rotation speed sensor; calculating the rotation speed of the slip shaft inside the winding barrel based on the transmission speed of the battery pole piece and the coil diameter of the battery pole piece outside the winding bobbin; determining whether the battery pole piece has a broken belt based on the rotation speed of the winding bobbin and using the rotation speed of the slip shaft inside the winding barrel as a preset threshold.

[0012] In a possible implementation, based on the transmission speed of the battery electrode sheet and the winding diameter of the battery electrode sheet outside the winding bobbin, calculating the rotation speed of the slip shaft in the winding barrel includes: based on the transmission speed of the battery electrode sheet, determining the linear speed of the slip shaft by using the slip shaft speed ratio method; based on the linear speed of the slip shaft and the winding diameter of the battery electrode sheet outside the winding bobbin, determining the rotation speed of the slip shaft in the winding barrel.

[0013] In a possible implementation, based on the transmission speed of the battery electrode sheet and the winding diameter of the battery electrode sheet outside the winding bobbin, calculating the rotation speed of the slip shaft in the winding barrel includes: based on the transmission speed of the battery electrode sheet, determining the linear speed of the slip shaft by using the slip shaft speed difference method; based on the linear speed of the slip shaft and the winding diameter of the battery electrode sheet outside the winding bobbin, determining the rotation speed of the slip shaft in the winding barrel.

[0014] In a possible implementation, based on the rotation speed of the winding bobbin, and taking the rotation speed of the slip shaft in the winding barrel as a preset threshold, determining whether the battery electrode sheet has a breakage includes: if the rotation speed of the winding bobbin is less than the rotation speed of the slip shaft in the winding barrel, determining that the battery electrode sheet is being wound normally; if the rotation speed of the winding bobbin is equal to the rotation speed of the slip shaft in the winding barrel, determining that the battery electrode sheet has a breakage.

[0015] In a second aspect, an embodiment of the present invention provides a device for detecting breakage after slitting by a roll slitter, which is applied to a roll slitter. The roll slitter includes a first over-roll and a second over-roll arranged horizontally, and an induction sensor arranged between the first over-roll and the second over-roll. After being slit, the battery electrode sheet makes a winding movement around the first over-roll, under the induction sensor, and around the second over-roll. The device for detecting breakage includes: a communication module for obtaining a detection signal of the induction sensor for the position of the lower battery electrode sheet during the operation of the roll slitter; a processing module for determining whether there is a battery electrode sheet at the position of the lower battery electrode sheet based on the detection signal; if there is a battery electrode sheet at the position of the lower battery electrode sheet, continuously performing real-time detection on the detection signal, and determining whether the battery electrode sheet has a breakage based on the real-time detected detection signal; if the battery electrode sheet has a breakage, controlling the roll slitter to stop.

[0016] In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method described in the first aspect and any possible implementation manner in the first aspect as above.

[0017] Fourth aspect, an embodiment of the present invention provides a roll separator, which includes a horizontally arranged first over-roll and a second over-roll, an induction sensor disposed between the first over-roll and the second over-roll, and a control device. After the battery pole piece is slit, it winds around the first over-roll, passes under the induction sensor, and winds around the second over-roll to perform a reel movement. The control device executes the method described in the above first aspect and any possible implementation manner thereof to achieve the detection of the breakage of the battery pole piece.

[0018] Fifth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, it implements the method described in the above first aspect and any possible implementation manner in the first aspect.

[0019] The present invention provides a method, a device and a roll separator for detecting the breakage of a battery pole piece after slitting. During the operation of the roll separator, the present invention detects the position of the lower battery pole piece through an induction sensor. If there is a battery pole piece, continuous real-time detection is performed, and based on the detection signal of the real-time detection, it is determined whether the battery pole piece has broken; if the battery pole piece has broken, the roll separator is controlled to stop. Compared with the traditional tension detection method, the present invention uses the induction sensor detection method to achieve breakage detection, which is not limited by tension, width, pole piece speed and material, realizes the accurate detection of the breakage of the battery pole piece under different working conditions, improves the accuracy of the breakage detection of the lithium battery pole piece, and avoids the waste of battery pole piece materials. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of a roll separator provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic flowchart of a method for detecting the breakage of a battery pole piece after slitting by a roll separator provided by an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram when there is a break in the battery pole piece provided by an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of the rear cartridge of a roll separator provided by an embodiment of the present invention;

[0025] Figure 5It is a schematic structural diagram of a device for detecting broken belts after slitting by a roll slitter provided by an embodiment of the present invention;

[0026] Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Specific embodiments

[0027] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0028] In the description of the present invention, unless otherwise specified, " / " means "or". For example, A / B can represent A or B. The "and / or" herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, "at least one" and "a plurality of" refer to two or more. The words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit being different.

[0029] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner for easy understanding.

[0030] In addition, the terms "including" and "having" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally further include other unlisted steps or modules, or may optionally further include other steps or modules inherent to these processes, methods, products, or devices.

[0031] To make the purpose, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments in conjunction with the drawings of the present invention.

[0032] As described in the background art, during the production process of lithium battery electrodes, the lithium battery electrodes need to be pre-slit. After slitting, generally, the winding detection tension and the set tension deviation are used to determine whether the tape is broken. Since the slitting number and the electrode position are not fixed due to the change of product models, when using a single slip shaft to wind multiple materials, if one of the materials has a broken tape, the winding tension detection mechanism will still detect the tension at this time, resulting in the inability to effectively trigger the broken tape alarm through the tension deviation, thus causing the accumulation of the wound broken tape materials and wasting raw materials. The traditional tension detection method has the technical problems of low accuracy and difficult detection.

[0033] To solve this technical problem, the embodiment of the present invention provides a method for detecting a broken tape after slitting by a slitting machine. By setting an induction sensor, the battery electrode below the induction sensor is detected. For example, the diffuse reflection sensor detection method can be adopted to quickly respond when the slitting equipment produces electrodes with different tensions, different widths, different speeds or different materials, effectively solving the low efficiency of judging by tension.

[0034] As Figure 1 shown, the embodiment of the present invention provides a slitting machine. The slitting machine includes a horizontally arranged first over-roller 1, a second over-roller 2, a diffuse reflection sensor 3 arranged between the first over-roller and the second over-roller, and a control device. The diffuse reflection sensor 3 is fixed above the electrode to be detected through a fixed bracket 4. After the battery electrode is slit, it winds around the first over-roller, passes through the lower part of the diffuse reflection sensor and the second over-roller for winding movement.

[0035] The diffuse reflection sensor is installed at the position where the battery electrode is stressed upward. When an object is detected, it outputs and adjusts the diffuse reflection output signal; adjusts the detection distance of the diffuse reflection sensor to realize the detection of a broken battery electrode. The detection distance should be greater than the distance between the diffuse reflection sensor and the electrode in the normal state.

[0036] Taking the distance between the diffuse reflection sensor and the electrode as a judgment condition, when the electrode is broken, the electrode relaxes and sags. When it is detected that the electrode exceeds the set distance of the diffuse reflection sensor and the output signal changes, it is judged that the electrode is broken or abnormal, and then an alarm signal is sent to the slitting equipment to make the equipment alarm and stop.

[0037] Optionally, Figure 1 the diffuse reflection sensor 3 in

[0038] As Figure 2As shown in the figure, an embodiment of the present invention provides a method for detecting tape breakage after slitting by a roll slitter. The method includes steps S101 - S104.

[0039] S101. Obtain the detection signal of the induction sensor for the position of the lower battery electrode plate during the operation of the roll slitter.

[0040] S102. Based on the detection signal, determine whether there is a battery electrode plate at the position of the lower battery electrode plate.

[0041] Exemplarily, an embodiment of the present invention can determine whether there is an object blocking at the position of the lower battery electrode plate of the diffuse reflection sensor or the distance sensor through the detection signal. If there is an object blocking, it means that there is a battery electrode plate at the detection position, that is, the roll slitter has started working. If there is no object blocking, it means that there is no battery electrode plate at the detection position, that is, the roll slitter is not working.

[0042] S103. If there is a battery electrode plate at the position of the lower battery electrode plate, continuously perform real-time detection on the detection signal, and based on the real-time detected detection signal, determine whether the battery electrode plate has broken the tape.

[0043] In some embodiments, the induction sensor is a diffuse reflection sensor.

[0044] Correspondingly, as a possible implementation manner, step S103 can be specifically implemented as steps A1 - A3.

[0045] A1. Based on the real-time detected detection signal, determine whether there is a battery electrode plate at the position of the lower battery electrode plate.

[0046] A2. If the position of the lower battery electrode plate changes from having a battery electrode plate to not having a battery electrode plate, determine whether the battery electrode plate has broken the tape.

[0047] A3. If the position of the lower battery electrode plate has a battery electrode plate and remains unchanged, determine that the battery electrode plate is being wound normally.

[0048] In some embodiments, the induction sensor is a distance sensor.

[0049] Correspondingly, as a possible implementation manner, step S102 can be specifically implemented as steps S1021 - S1023.

[0050] S1021. Based on the detection signal, determine the real-time distance between the battery electrode plate and the distance sensor.

[0051] S1022. If the real-time distance is less than or equal to the preset distance, determine that there is a battery electrode plate at the position of the lower battery electrode plate.

[0052] S1023. If the real-time distance is greater than the preset distance, it is determined that there is no battery electrode sheet at the position of the lower battery electrode sheet.

[0053] Correspondingly, as a possible implementation manner, step S103 can be specifically implemented as steps B1 - B3.

[0054] B1. Based on the detection signal detected in real time, determine the real-time distance between the battery electrode sheet and the distance sensor.

[0055] B2. If the real-time distance changes from being less than or equal to the preset distance to being greater than the preset distance, it is determined that the battery electrode sheet has a tape break.

[0056] B3. If the real-time distance is less than or equal to the preset distance and remains unchanged, it is determined that the battery electrode sheet is being wound up normally.

[0057] S104. If the battery electrode sheet has a tape break, control the roll slitter to stop.

[0058] Optionally, if the battery electrode sheet does not have a tape break, keep the roll slitter running.

[0059] Exemplarily, after slitting, the electrode sheets respectively pass through the first over-roller 1 and the second over-roller 2. The diffuse reflection sensor 3 is fixed above the electrode sheet at a height of 5 cm via the fixed bracket 4. The left and right positions of the diffuse reflection sensor 3 can be adjusted according to the material model.

[0060] The set distance set for the diffuse reflection sensor can be 8 cm; when the distance between the diffuse reflection sensor and the electrode sheet is greater than 8 cm, the output signal will be switched; thus, it is possible to judge whether there is an abnormal tape break through the detection signal feedback of the diffuse reflection sensor. The smaller the set distance, the faster the detection response speed; but the set distance is not allowed to be less than the standard distance between the electrode sheet and the diffuse reflection sensor.

[0061] As Figure 3 shown, assuming the real-time distance is 6 cm, and the real-time distance of 6 cm is less than the set distance of 8 cm, it can be determined as a normal detection distance. Assuming the real-time distance is 10 cm and the battery electrode sheet sags, and the real-time distance of 10 cm is greater than the set distance of 8 cm, it can be determined as an abnormal detection distance.

[0062] When the device is started, the current states of each sensor are collected once. If the sensor detects the electrode sheet, this sensor detection function will be enabled; if the sensor does not detect the electrode sheet, it is defaulted that there is no electrode sheet at the current position. When changing the product model, it is necessary to check the correspondence between the sensor and the electrode sheet. When the sensor that has been enabled to detect cannot detect the electrode sheet during the operation of the device, it is regarded as a tape break, and thus the tape break signal is transmitted to the device for alarm and shutdown. After the alarm and shutdown, the sensor detection function is turned off, and it will be re-detected when starting again.

[0063] After the tape breaks and the machine stops, the broken tape electrode sheets will accumulate, wrinkle and break, and cannot flow into the next process normally. Generally, they will be scrapped. Therefore, the higher the detection sensitivity and the faster the response speed, the less waste of electrode sheets. After the tape breaks and the machine stops, the unbroken electrode sheets will be normally wound into the roll, without additional treatment, and will flow into the next process normally.

[0064] The present invention provides a method for detecting tape breakage after slitting by a roll slitter. During the operation of the roll slitter, the position of the lower battery electrode sheet is detected by an inductive sensor. If there is a battery electrode sheet, continuous real-time detection is carried out, and based on the detection signal detected in real time, it is determined whether the battery electrode sheet has broken; if the battery electrode sheet has broken, the roll slitter is controlled to stop. Compared with the traditional tension detection method, the present invention uses the inductive sensor detection method to realize tape breakage detection, which is not limited by tension, width, electrode sheet speed and material, realizes accurate detection of tape breakage of battery electrode sheets under different working conditions, improves the accuracy of tape breakage detection of lithium battery electrode sheets, and avoids waste of battery electrode sheet materials.

[0065] It should be noted that the present invention uses a diffuse reflection sensor for tape breakage detection, which will automatically judge the tape breakage operation situation of the equipment during the operation of the equipment, reducing manual operation. It has a fast response speed, high detection efficiency, emits an abnormal signal immediately after a tape break problem occurs, and reduces material waste. It has high accuracy and is not prone to misjudgment; it has high product compatibility and can detect the winding situation of single-axis multi-width at the same time; it has low requirements for equipment speed and can be normally inspected regardless of high or low speed; the detection device has low cost and is convenient for installation and debugging.

[0066] The traditional method of judging whether there is a tape break according to the material tension has hysteresis when applied to the case of single-axis single-width winding, and it is impossible to effectively judge the single-width tape break when winding a single-axis multi-width material roll, resulting in misjudgment. The present invention uses the change in the distance between the diffuse reflection sensor and the material as the judgment condition. Whether it is used for single-axis single-width or single-axis multi-width winding, it can accurately and timely judge whether there is a tape break in the equipment and whether it can operate normally.

[0067] Optionally, as Figure 4 shown, a winding drum is arranged behind the roll slitter, and the battery electrode sheet is wound by the winding drum after passing through the second roller of the roll slitter; a rotation speed sensor is arranged inside the winding drum, and a coil diameter detection sensor is arranged outside the winding drum.

[0068] Correspondingly, the method for detecting tape breakage after slitting by a roll slitter provided by the embodiment of the present invention further includes steps S201-S204.

[0069] S201. Detect the coil diameter of the battery electrode sheet outside the winding drum through the coil diameter detection sensor.

[0070] S202. Detect the rotation speed of the winding bobbin through the rotation speed sensor.

[0071] S203. Calculate the rotation speed of the slip shaft in the winding barrel based on the transmission speed of the battery electrode sheet and the winding diameter of the battery electrode sheet on the outer side of the winding barrel.

[0072] It should be noted that in the embodiment of the present invention, the breakage of the tape on the bobbin can be detected only for the slip shaft winding by judging the rotation speed of the winding bobbin; whether the winding is broken can be judged by the running speed of the equipment and the speed difference between the running speed of the slip shaft and the speed of the winding bobbin.

[0073] As Figure 4 shown, a magnetic induction sensor, that is, a rotation speed sensor, is added between the slip shaft and the side of the bobbin. Every time the bobbin rotates one circle, the magnetic induction sensor sends a pulse signal to the PLC controller, and the running rotation speed of the bobbin can be calculated by reading the pulse signal. The current winding diameter value is calculated by the winding diameter sensor, and the material linear velocity can be calculated according to the current winding diameter.

[0074] As a possible implementation manner, step S203 can be specifically implemented as steps C1-C2.

[0075] C1. Determine the linear velocity of the slip shaft based on the transmission speed of the battery electrode sheet by using the slip shaft speed ratio method.

[0076] C2. Determine the rotation speed of the slip shaft in the winding barrel based on the linear velocity of the slip shaft and the winding diameter of the battery electrode sheet on the outer side of the winding barrel.

[0077] As a possible implementation manner, step S203 can also be specifically implemented as steps D1-D2.

[0078] D1. Determine the linear velocity of the slip shaft based on the transmission speed of the battery electrode sheet by using the slip shaft speed difference method.

[0079] D2. Determine the rotation speed of the slip shaft in the winding barrel based on the linear velocity of the slip shaft and the winding diameter of the battery electrode sheet on the outer side of the winding barrel.

[0080] Exemplarily, the linear velocity of the winding slip shaft is generally higher than the linear velocity of the bobbin, otherwise a constant tension cannot be guaranteed. Generally, there are two methods:

[0081] 1. Slip shaft speed ratio method: Y = XK;

[0082] 2. Slip shaft speed difference method: Y = X + B;

[0083] Wherein, Y: the running linear velocity of the winding slip shaft; X: the running speed of the equipment; K: the speed coefficient (generally 1.2-1.4 times); B: the speed difference constant (generally 10-15 m / min).

[0084] Example: The operating speed of the equipment is 60 m / min; the winding diameter is 500 mm; since the barrel is pulled by the material, the linear speed of the barrel is the operating speed of the equipment, that is, the transmission speed of the battery electrode sheet, 60 m / min.

[0085] (1) Calculation of the barrel rotation speed: According to the rotation speed formula n = v / (πd), when the winding diameter is 500 mm, the barrel rotates 38.21 circles per minute. During normal operation, the sensor sends 38 pulse signals per minute, about 1.57 s / pulse.

[0086] (2) Calculation of the rotation speed in the way of the speed ratio of the slip shaft: Taking 1.2 times as an example, when the equipment operates at 60 m / min, the slip shaft is 72 m / min; according to the rotation speed formula n = v / (πd), when the winding diameter is 500 mm, the slip shaft rotates 45.85 circles per minute. During operation, the sensor sends 45 pulse signals per minute, about 1.30 s / pulse.

[0087] (3) Calculation of the rotation speed in the way of the speed difference of the slip shaft: Taking the speed difference of 10 m / min as an example, when the equipment operates at 60 m / min, the slip shaft is 70 m / min;

[0088] According to the rotation speed formula n = v / (πd), when the winding diameter is 500 mm, the slip shaft rotates 44.58 circles per minute. During operation, the sensor sends 44 pulse signals per minute, about 1.34 s / pulse.

[0089] Through the above calculations, when the equipment operates at 60 m / min, taking the speed difference of the slip shaft as 10 m / min as an example, the detection signal of the slip shaft is 44 per minute; the detection signal of the barrel is 38 per minute.

[0090] If there is a break in the battery electrode sheet, the speed of the barrel will increase to 70 m / min. At that time, the detection signal of the barrel will increase, and it can be judged as the break state; a stop instruction needs to be issued.

[0091] S204. Based on the rotation speed of the winding barrel, taking the rotation speed of the slip shaft in the winding barrel as a preset threshold, determine whether the battery electrode sheet has a break.

[0092] Exemplarily, if the rotation speed of the winding barrel is less than the rotation speed of the slip shaft in the winding barrel, it is determined that the battery electrode sheet is normally wound.

[0093] Another exemplarily, if the rotation speed of the winding barrel is equal to the rotation speed of the slip shaft in the winding barrel, it is determined that the battery electrode sheet has a break.

[0094] Optionally, for the method for detecting a break after slitting by the roll slitter provided in the embodiment of the present invention, after step S104, it further includes steps S301-S302.

[0095] S301. Determine the coiled length of the battery electrode sheet based on the running duration of the roll slitter and the transmission speed of the battery electrode sheet.

[0096] S302. Generate an alarm message based on the coiled length of the battery electrode sheet and the downtime of the roll slitter.

[0097] In some embodiments, the alarm message includes the coiled length and the downtime of the roll slitter.

[0098] S302. Send the alarm message to the user to prompt the user to clean up the waste battery electrode sheets.

[0099] In this way, the embodiment of the present invention can send an alarm message to the user when the roll slitter stops, prompting the user to clean up the waste battery electrode sheets, which is convenient for the production of battery electrode sheets.

[0100] Optionally, the method for detecting tape breakage after slitting by the roll slitter provided by the embodiment of the present invention further includes steps S401 - S403.

[0101] S401. Obtain the rotation speed of the roller passing through the roll slitter in the current period.

[0102] In some embodiments, the rotation speed of the roller passing through the roll slitter represents the coiling speed of the battery electrode sheet. The faster the rotation speed of the roller passing through the roll slitter, the faster the coiling speed of the battery electrode sheet. The slower the rotation speed of the roller passing through the roll slitter, the slower the coiling speed of the battery electrode sheet.

[0103] S402. Calculate the ratio of the rotation speed to the standard speed.

[0104] S403. Determine the set distance in the current period based on the ratio of the rotation speed to the standard speed and the standard set distance.

[0105] In some embodiments, the standard set distance corresponds to the standard speed.

[0106] It should be noted that the rotation speed of the roller passing through the roll slitter is inversely proportional to the set distance. The faster the rotation speed of the roller passing through the roll slitter, the smaller the set distance, indicating that the tape breakage detection response speed is faster, so as to adapt to the coiling speed of the battery electrode sheet.

[0107] In this way, the embodiment of the present invention can dynamically adjust the set distance according to the rotation speed of the roller passing through the roll slitter, that is, dynamically adjust the tape breakage detection response speed, so that the tape breakage detection response speed adapts to the coiling speed of the battery electrode sheet, improving the accuracy of tape breakage detection of the battery electrode sheet.

[0108] Optionally, the method for detecting tape breakage after slitting by the roll slitter provided by the embodiment of the present invention further includes steps S501 - S503.

[0109] S501. Obtain the detection sensitivity input by the user.

[0110] S502. Determine the sag change ratio of the battery pole piece based on the detection sensitivity.

[0111] In some embodiments, the sag change ratio is used to indicate the boundary point between the normal state and the tape break state of the battery pole piece.

[0112] S503. Determine the set distance based on the sag change ratio of the battery pole piece and the installation distance of the diffuse reflection sensor.

[0113] In some embodiments, the installation distance is the distance between the diffuse reflection sensor and the battery pole piece when the battery pole piece is in the normal state.

[0114] It should be noted that the installation distances corresponding to different product pole pieces are different. When the pole piece type is changed, the user can directly input the detection sensitivity, automatically determine the set distance, and perform tape break detection, which improves the convenience for the user.

[0115] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0116] The following is an apparatus embodiment of the present invention. For details not described in detail, reference may be made to the corresponding method embodiment above.

[0117] Figure 5 The structural schematic diagram of a tape break detection device after slitting by a roll slitter provided by an embodiment of the present invention is shown. The tape break detection device 600 includes a communication module 601 and a processing module 602.

[0118] The communication module 601 is configured to obtain the detection signal of the position of the lower battery pole piece by the induction sensor during the operation of the roll slitter.

[0119] The processing module 602 is configured to determine whether there is a battery pole piece at the position of the lower battery pole piece based on the detection signal; if there is a battery pole piece at the position of the lower battery pole piece, continuously perform real-time detection on the detection signal, and determine whether the battery pole piece has a tape break based on the detection signal of the real-time detection; if the battery pole piece has a tape break, control the roll slitter to stop.

[0120] Figure 6 The structural schematic diagram of an electronic device provided by an embodiment of the present invention is shown. As Figure 6As shown, the electronic device 700 includes: a processor 701, a memory 702, and a computer program 703 stored in the memory 702 and executable on the processor 701. When the processor 701 executes the computer program 703, the steps in the above method embodiments are implemented, such as Figure 2 the steps S101 - S104 shown. Alternatively, when the processor 701 executes the computer program 703, the functions of each module / unit in the above device embodiments are implemented. For example, Figure 5 the functions of the communication module 601 and the processing module 602 shown.

[0121] Exemplarily, the computer program 703 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 702 and executed by the processor 701 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 703 in the electronic device 700. For example, the computer program 703 can be divided into Figure 5 the communication module 601 and the processing module 602 shown.

[0122] The so-called processor 701 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0123] The memory 702 may be an internal storage unit of the electronic device 700, such as a hard disk or memory of the electronic device 700. The memory 702 may also be an external storage device of the electronic device 700, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the electronic device 700. Further, the memory 702 may also include both the internal storage unit of the electronic device 700 and an external storage device. The memory 702 is used to store the computer program and other programs and data required by the terminal. The memory 702 may also be used to temporarily store data that has been output or is to be output.

[0124] The above-described embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they may still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and shall all be included in the protection scope of the present invention.

Claims

1. A method for detecting broken belts after slitting by a roller slitter, characterized in that: Applied to a roll separator, the roll separator includes a horizontally arranged first over-roll and a second over-roll, and an induction sensor arranged between the first over-roll and the second over-roll. After the battery electrode sheet is slit, it makes a winding movement around the first over-roll, passes under the induction sensor, and winds around the second over-roll. The method includes: Obtain the detection signal of the induction sensor for the position of the lower battery electrode sheet during the operation of the roll separator; Based on the detection signal, determine whether there is a battery electrode sheet at the position of the lower battery electrode sheet; If there is a battery electrode sheet at the position of the lower battery electrode sheet, continuously perform real-time detection on the detection signal, and based on the real-time detected detection signal, determine whether the battery electrode sheet has a tape break; If the battery electrode sheet has a tape break, control the roll separator to stop; A winding drum is arranged behind the roll separator, and after passing through the second over-roll of the roll separator, the battery electrode sheet is wound by the winding drum. A rotational speed sensor is arranged inside the winding drum, and a coil diameter detection sensor is arranged outside the winding drum. The method further includes: detecting the coil diameter of the battery electrode sheet outside the winding drum through the coil diameter detection sensor; detecting the rotational speed of the winding drum through the rotational speed sensor; calculating the rotational speed of the slip shaft inside the winding barrel based on the transmission speed of the battery electrode sheet and the coil diameter of the battery electrode sheet outside the winding drum; based on the rotational speed of the winding drum, taking the rotational speed of the slip shaft inside the winding barrel as a preset threshold, determine whether the battery electrode sheet has a tape break.

2. The method for detecting broken belts after slitting by a roll slitter according to claim 1, wherein, The induction sensor is a diffuse reflection sensor; Correspondingly, the determining whether the battery electrode sheet has a tape break based on the real-time detected detection signal includes: Based on the real-time detected detection signal, determine whether there is a battery electrode sheet at the position of the lower battery electrode sheet; If the position of the lower battery electrode sheet changes from having a battery electrode sheet to not having a battery electrode sheet, determine whether the battery electrode sheet has a tape break; If the position of the lower battery electrode sheet has a battery electrode sheet and remains unchanged, determine that the battery electrode sheet is being wound normally.

3. The method for detecting broken belts after slitting by a roller slitting machine according to claim 1, characterized in that: The induction sensor is a distance sensor; Correspondingly, the determining whether there is a battery electrode sheet at the position of the lower battery electrode sheet based on the detection signal includes: Based on the detection signal, determine the real-time distance between the battery electrode sheet and the distance sensor; If the real-time distance is less than or equal to a preset distance, determine that there is a battery electrode sheet at the position of the lower battery electrode sheet; If the real-time distance is greater than the preset distance, determine that there is no battery electrode sheet at the position of the lower battery electrode sheet.

4. The method for detecting broken belts after slitting by a roll slitter according to claim 3, characterized in that, The determining whether the battery electrode sheet has a tape break based on the real-time detected detection signal includes: Based on the real-time detected detection signal, determine the real-time distance between the battery electrode sheet and the distance sensor; If the real-time distance changes from being less than or equal to the preset distance to being greater than the preset distance, determine that the battery electrode sheet has a tape break; If the real-time distance is less than or equal to the preset distance and remains unchanged, determine that the battery electrode sheet is being wound normally.

5. The method for detecting broken belt after slitting by a roll slitter according to claim 1, characterized in that, The calculating the rotational speed of the slip shaft inside the winding barrel based on the transmission speed of the battery electrode sheet and the coil diameter of the battery electrode sheet outside the winding drum includes: Based on the transmission speed of the battery electrode sheet, the linear speed of the slip shaft is determined by means of the slip shaft speed ratio. Based on the linear speed of the slip shaft and the coil diameter of the battery electrode sheet outside the winding drum, the rotational speed of the slip shaft inside the winding drum is determined.

6. The method for detecting tape breakage after slitting by a roll slitter according to claim 1, characterized in that, The calculation of the rotational speed of the slip shaft inside the winding drum based on the transmission speed of the battery electrode sheet and the coil diameter of the battery electrode sheet outside the winding drum includes: Based on the transmission speed of the battery electrode sheet, the linear speed of the slip shaft is determined by means of the slip shaft speed difference. Based on the linear speed of the slip shaft and the coil diameter of the battery electrode sheet outside the winding drum, the rotational speed of the slip shaft inside the winding drum is determined.

7. The method for detecting broken belts after slitting by a roller slitting machine according to claim 1, characterized in that: The determination of whether the battery electrode sheet breaks based on the rotational speed of the winding drum and taking the rotational speed of the slip shaft inside the winding drum as a preset threshold includes: If the rotational speed of the winding drum is less than the rotational speed of the slip shaft inside the winding drum, it is determined that the battery electrode sheet is being wound normally. If the rotational speed of the winding drum is equal to the rotational speed of the slip shaft inside the winding drum, it is determined that the battery electrode sheet has broken.

8. A device for detecting broken belts after slitting by a roll slitter, characterized in that, Applied to a roll slitter, the roll slitter includes a horizontally arranged first over-roll and a second over-roll, and an induction sensor arranged between the first over-roll and the second over-roll. After being slit, the battery electrode sheet winds around the first over-roll, passes under the induction sensor, and winds around the second over-roll for a winding motion. The device for detecting broken belt includes: A communication module for acquiring the detection signal of the position of the lower battery electrode sheet by the induction sensor during the operation of the roll slitter. A processing module for determining whether there is a battery electrode sheet at the position of the lower battery electrode sheet based on the detection signal; if there is a battery electrode sheet at the position of the lower battery electrode sheet, continuously perform real-time detection on the detection signal, and determine whether the battery electrode sheet has broken based on the real-time detected detection signal; if the battery electrode sheet has broken, control the roll slitter to stop. A winding drum is arranged behind the roll slitter, and after passing through the second over-roll of the roll slitter, the battery electrode sheet is wound by the winding drum; a rotational speed sensor is arranged inside the winding drum, and a coil diameter detection sensor is arranged outside the winding drum. The coil diameter of the battery electrode sheet outside the winding drum is detected by the coil diameter detection sensor; the rotational speed of the winding drum is detected by the rotational speed sensor. The processing module is further configured to calculate the rotational speed of the slip shaft inside the winding drum based on the transmission speed of the battery electrode sheet and the coil diameter of the battery electrode sheet outside the winding drum; and determine whether the battery electrode sheet has broken based on the rotational speed of the winding drum and taking the rotational speed of the slip shaft inside the winding drum as a preset threshold.

9. A roller separator, characterized in that, The roll slitter includes a horizontally arranged first over-roll and a second over-roll, an induction sensor arranged between the first over-roll and the second over-roll, and a control device. After being slit, the battery electrode sheet winds around the first over-roll, passes under the induction sensor, and winds around the second over-roll for a winding motion. The control device executes the method according to any one of claims 1 to 7 to realize the detection of broken belt of the battery electrode sheet.

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