Method and device for detecting broken belt after slitting of roller separating machine and roller separating machine

Abstract

The invention provides a method and a device for detecting belt breakage after slitting of a roller separating machine and the roller separating machine, and relates to the technical field of lithium battery production and processing. In the running process of the roller extension machine, the position of a lower battery pole piece is detected through an inductive sensor, if the battery pole piece exists, continuous real-time detection is conducted, and whether belt breakage happens to the battery pole piece or not is determined based on a detection signal detected in real time; and if the belt of the battery pole piece is broken, controlling the roller extension machine to stop. Compared with a traditional tension detection mode, the belt breakage detection is realized by adopting an inductive sensor detection mode, the belt breakage detection is not limited by tension, breadth, pole piece speed and material, the accurate detection of the belt breakage of the battery pole piece under different working conditions is realized, the accuracy of the belt breakage detection of the lithium battery pole piece is improved, and the waste of the material of the battery pole piece is avoided.

Description

Technical Field

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

[0002] In the lithium battery manufacturing industry, the slitting of battery pole pieces is one of the key links in the production process, and its quality directly affects the performance and safety of subsequent batteries. The traditional post-slitting detection method mainly relies on winding tension detection, which determines whether the belt breaks 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 has gradually exposed its limitations.

[0003] First, different types of lithium battery pole pieces require different tensions, widths, speeds, and materials when slitting, which makes it difficult for a single tension detection standard to adapt to diverse production needs. Especially when using a single slip shaft to reel in multiple materials at the same time, if one of the pole pieces breaks, the winding tension detection mechanism may still be able to detect sufficient tension because the other materials are still being reeled in normally, and thus the break alarm cannot be triggered in time.

[0004] Secondly, the traditional tension detection method is also insufficient in response speed and accuracy. When a belt breaks, it is often necessary to wait until the tension changes accumulate to a certain extent before it can be detected. This may cause the material after the belt breaks to accumulate for a certain length, increasing the waste of raw materials and the difficulty of subsequent processing.

[0005] Therefore, traditional tension detection methods have problems of low accuracy and difficulty in detection, and are unable to meet the needs of modern lithium battery production lines. Summary of the invention

[0006] The present invention provides a method and device for detecting broken tape after slitting by a roller divider, and a roller divider, which can improve the accuracy of detecting broken tape of lithium battery pole pieces.

[0007] In a first aspect, the present invention provides a method for detecting broken strips after slitting by a roller spreader, which is applied to the roller spreader, wherein the roller spreader comprises a first roller and a second roller arranged horizontally, and an inductive sensor arranged between the first roller and the second roller. After the battery electrode is slid, it moves around the first roller, through the lower part of the inductive sensor, and around the second roller for a reeling motion. The method comprises: obtaining a detection signal of the inductive sensor on the position of the lower battery electrode during the operation of the roller spreader; determining whether there is a battery electrode at the position of the lower battery electrode based on the detection signal; if there is a battery electrode at the position of the lower battery electrode, continuously performing real-time detection of the detection signal, and determining whether the battery electrode is broken based on the real-time detection signal; if the battery electrode is broken, controlling the roller spreader to stop.

[0008] In one possible implementation, the induction sensor is a diffuse reflection sensor; accordingly, the determination of whether the battery pole piece is broken 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 the presence of a battery pole piece to the absence of a battery pole piece, determining whether the battery pole piece is broken; if the position of the lower battery pole piece is that there is a battery pole piece and it remains unchanged, determining that the battery pole piece is rolled up normally.

[0009] In a possible implementation, the induction sensor is a distance sensor; accordingly, determining whether there is a battery pole sheet at the lower battery pole sheet position based on the detection signal includes: determining the real-time distance between the battery pole sheet 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 sheet at the lower battery pole sheet position; if the real-time distance is greater than the preset distance, determining that there is no battery pole sheet at the lower battery pole sheet position.

[0010] In one possible implementation, determining whether the battery electrode is broken is based on a detection signal detected in real time, including: determining the real-time distance between the battery electrode 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 a preset distance to being greater than the preset distance, determining that the battery electrode is broken; if the real-time distance is less than or equal to the preset distance and remains unchanged, determining that the battery electrode is wound normally.

[0011] In a possible implementation, a winding drum is provided behind the roller divider, and the battery electrode sheet is wound up by the winding drum after passing through the second roller of the roller divider; a rotation speed sensor is provided inside the winding drum, and a winding diameter detection sensor is provided outside the winding drum; the method further comprises: detecting the winding diameter of the battery electrode sheet outside the winding drum by the winding diameter detection sensor; detecting the rotation speed of the winding drum by the rotation speed sensor; calculating 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 outside the winding drum; determining whether the battery electrode sheet is broken based on the rotation speed of the winding drum and taking the rotation speed of the slip shaft in the winding barrel as a preset threshold value.

[0012] In one possible implementation, the rotational speed of the slip shaft in the winding barrel is calculated based on the transmission speed of the battery electrode sheet and the winding diameter of the battery electrode sheet outside the winding barrel, including: determining the linear speed of the slip shaft based on the transmission speed of the battery electrode sheet using the slip shaft speed ratio method; determining the rotational speed of the slip shaft in the winding barrel based on the linear speed of the slip shaft and the winding diameter of the battery electrode sheet outside the winding barrel.

[0013] In one possible implementation, the rotational speed of the slip shaft in the winding barrel is calculated based on the transmission speed of the battery pole piece and the winding diameter of the battery pole piece outside the winding barrel, including: determining the linear speed of the slip shaft based on the transmission speed of the battery pole piece by adopting the slip shaft speed difference method; determining the rotational speed of the slip shaft in the winding barrel based on the linear speed of the slip shaft and the winding diameter of the battery pole piece outside the winding barrel.

[0014] In one possible implementation, based on the rotation speed of the winding drum, with the rotation speed of the slip shaft in the winding drum as a preset threshold, it is determined whether the battery electrode is broken, including: if the rotation speed of the winding drum is less than the rotation speed of the slip shaft in the winding drum, it is determined that the battery electrode is wound normally; if the rotation speed of the winding drum is equal to the rotation speed of the slip shaft in the winding drum, it is determined that the battery electrode is broken.

[0015] In the second aspect, an embodiment of the present invention provides a device for detecting broken belts after slitting by a roller spreader, which is applied to the roller spreader, wherein the roller spreader includes a first roller and a second roller arranged horizontally, and an inductive sensor arranged between the first roller and the second roller. After the battery pole piece is slid, it rolls around the first roller, passes through the lower part of the inductive sensor, and rolls around the second roller. The device for detecting broken belts includes: a communication module, which is used to obtain a detection signal of the inductive sensor on the position of the lower battery pole piece during the operation of the roller spreader; a processing module, which is used to determine whether there is a battery pole piece at the lower battery pole piece position based on the detection signal; if there is a battery pole piece at the lower battery pole piece position, the detection signal is continuously detected in real time, and based on the real-time detection signal, it is determined whether the battery pole piece is broken; if the battery pole piece is broken, the roller spreader is controlled to stop.

[0016] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, the memory storing a computer program, the processor being 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 method of the first aspect.

[0017] In a fourth aspect, an embodiment of the present invention provides a roller separator, which includes a first roller and a second roller arranged horizontally, an inductive sensor arranged between the first roller and the second roller, and a control device. After the battery pole piece is cut, it wraps around the first roller, passes through the lower part of the inductive sensor, and wraps around the second roller to perform a reel movement. The control device executes the method described in the first aspect and any possible implementation method to realize the detection of broken battery pole pieces.

[0018] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and is characterized in that when the computer program is executed by a processor, the method described in the first aspect and any possible implementation method of the first aspect is implemented.

[0019] The present invention provides a method, device and roller divider for detecting belt breakage after slitting by a roller divider. During the operation of the roller divider, the present invention detects the position of the lower battery pole piece by an inductive sensor. If a battery pole piece exists, the present invention continuously detects in real time, and determines whether the battery pole piece is broken based on the detection signal of the real-time detection; if the battery pole piece is broken, the roller divider is controlled to stop. Compared with the traditional tension detection method, the present invention uses an inductive sensor detection method to realize belt breakage detection, which is not limited by tension, width, pole piece speed and material, and realizes accurate detection of battery pole piece broken belts under different working conditions, improves the accuracy of lithium battery pole piece broken belt detection, and avoids waste of battery pole piece materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of a roller separator provided by an embodiment of the present invention; Figure 2 It is a flow chart of a method for detecting a broken belt after slitting by a roller slitting machine provided by an embodiment of the present invention; Figure 3 This is a schematic diagram of a battery electrode provided by an embodiment of the present invention when there is a broken strip; Figure 4 It is a structural schematic diagram of a rear barrel of a roller separator provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a device for detecting belt breakage after slitting by a roller slitting machine provided in an embodiment of the present invention; Figure 6It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may 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 prevent unnecessary details from obstructing the description of the present invention.

[0023] In the description of the present invention, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article 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 mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" and "plurality" refer to two or more. The words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be different.

[0024] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0025] In addition, the terms "including" and "having" and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. 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 include other steps or modules that are not listed, or may optionally include other steps or modules that are inherent to these processes, methods, products or devices.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be described through specific embodiments in conjunction with the accompanying drawings of the present invention.

[0027] As described in the background technology, lithium battery pole pieces need to be pre-slit during the production process. After slitting, the winding tension is generally detected by comparing it with the set tension deviation to determine whether the strip is broken. The number of slits and the position of the pole pieces are not fixed due to changes in product models. Therefore, when using a single slip shaft to reel in multiple strips of material, if one of the strips is broken, the winding tension detection mechanism will still detect the tension, resulting in the inability to effectively trigger the broken strip alarm through the tension deviation, resulting in the accumulation of the broken strip material during winding, resulting in a waste of raw materials. Traditional tension detection methods have technical problems such as low accuracy and difficult detection.

[0028] To solve this technical problem, an embodiment of the present invention provides a method for detecting broken tape after slitting by a roller slitting machine, by setting an inductive sensor to detect the battery pole piece below the inductive sensor. For example, a diffuse reflection sensor detection method can be used to quickly respond to the broken tape of the roller slitting equipment when producing pole pieces with different tensions, different widths, different speeds or different materials, effectively solving the low efficiency of tension judgment.

[0029] like Figure 1 As shown, an embodiment of the present invention provides a roller separator. The roller separator includes a first roller 1 and a second roller 2 arranged horizontally, a diffuse reflection sensor 3 arranged between the first roller and the second roller, and a control device. The diffuse reflection sensor 3 is fixed to the upper side of the electrode to be detected through a fixed bracket 4. After the battery electrode is cut, it moves around the first roller, through the lower part of the diffuse reflection sensor and the second roller to perform a reel movement.

[0030] The diffuse reflection sensor is installed at the upward force position of the battery pole piece. 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 broken battery pole pieces. The detection distance should be greater than the distance between the diffuse reflection sensor and the pole piece in normal state.

[0031] The distance between the diffuse reflection sensor and the pole piece is used as the judgment condition. When the pole piece is broken, the pole piece relaxes and sags. When the pole piece is detected to exceed the set distance of the diffuse reflection sensor, the output signal changes, and it is judged as a broken pole piece or abnormal, and an alarm signal is sent to the roller separation equipment, causing the equipment to alarm and shut down.

[0032] Optional, Figure 1 The diffuse reflection sensor 3 in the embodiment can also be replaced by a distance sensor. The embodiment of the present invention can obtain the detection signal of the distance sensor, judge the detection signal, and realize the detection of the battery pole piece. The distance sensor converts the distance parameter of the detected battery pole piece into an analog quantity (voltage / current) or a communication method and sends it to the controller; the parameter read by the controller is compared with the set threshold value, and if it exceeds the threshold range, it will be judged as a detection abnormality.

[0033] like Figure 2As shown, an embodiment of the present invention provides a method for detecting broken belts after slitting by a roller slitting machine. The method includes steps S101-S104.

[0034] S101, obtaining a detection signal of the position of the lower battery electrode by the induction sensor during the operation of the roller extension machine.

[0035] S102: Determine whether there is a battery electrode sheet at the lower battery electrode sheet position based on the detection signal.

[0036] For example, the embodiment of the present invention can determine whether the lower battery pole position of the diffuse reflection sensor or the distance sensor is blocked by an object through the detection signal. If there is an object blocking it, it means that there is a battery pole at the detection position, that is, the roller separator has started to work. If there is no object blocking it, it means that there is no battery pole at the detection position, that is, the roller separator is not working.

[0037] S103: If there is a battery electrode sheet at the lower battery electrode sheet position, continue to detect the detection signal in real time, and determine whether the battery electrode sheet is broken based on the detection signal detected in real time.

[0038] In some embodiments, the inductive sensor is a diffuse reflection sensor.

[0039] Correspondingly, as a possible implementation manner, step S103 can be specifically implemented as steps A1-A3.

[0040] A1. Based on the detection signal detected in real time, determine whether there is a battery electrode sheet at the lower battery electrode sheet position.

[0041] A2. If the position of the lower battery electrode sheet changes from the presence of a battery electrode sheet to the absence of a battery electrode sheet, determine whether the battery electrode sheet is broken.

[0042] A3. If the battery electrode sheet exists at the lower battery electrode sheet position and remains unchanged, it is determined that the battery electrode sheet is rolled up normally.

[0043] In some embodiments, the inductive sensor is a distance sensor.

[0044] Accordingly, as a possible implementation manner, step S102 can be specifically implemented as steps S1021-S1023.

[0045] S1021. Determine the real-time distance between the battery electrode and the distance sensor based on the detection signal.

[0046] S1022: If the real-time distance is less than or equal to the preset distance, it is determined that a battery electrode sheet exists at the lower battery electrode sheet position.

[0047] S1023: If the real-time distance is greater than the preset distance, it is determined that no battery electrode exists at the lower battery electrode position.

[0048] Accordingly, as a possible implementation manner, step S103 can be specifically implemented as steps B1-B3.

[0049] B1. Based on the detection signal detected in real time, determine the real-time distance between the battery electrode and the distance sensor.

[0050] 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 is broken.

[0051] 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 is rolled up normally.

[0052] S104: If the battery electrode is broken, the roller separator is controlled to stop.

[0053] Optionally, if the battery pole piece is not broken, keep the roller extension machine running.

[0054] For example, after slitting, the pole pieces pass through the first roller 1 and the second roller 2 respectively, and the diffuse reflection sensor 3 is fixed at a height of 5 cm above the pole pieces via the fixing bracket 4. The left and right positions of the diffuse reflection sensor 3 can be adjusted according to the material model.

[0055] The set distance of the diffuse reflection sensor can be 8cm; when the diffuse reflection sensor is greater than 8cm from the pole piece, the output signal will be switched; in this way, the detection signal feedback of the diffuse reflection sensor can be used to determine whether there is an abnormal belt break. 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 pole piece and the diffuse reflection sensor.

[0056] like Figure 3 As shown, if the real-time distance is 6cm, the real-time distance 6cm is less than the set distance 8cm, then it can be determined as a normal detection distance. If the real-time distance is 10cm, the battery pole piece sags, and the real-time distance 10cm is greater than the set distance 8cm, then it can be determined as an abnormal detection distance.

[0057] When the device starts, the current status of each sensor is collected once. If the sensor detects a pole piece, the sensor detection function will be turned on; if the sensor does not detect a pole piece, it is assumed that there is no pole piece at the current position. When the product is changed, the correspondence between the sensor and the pole piece needs to be checked. When the sensor that is turned on for detection cannot detect a pole piece during the operation of the device, it is considered to be broken, and the broken belt signal is transmitted to the device for alarm shutdown. After the alarm shutdown, the sensor detection function is turned off, and it will be re-detected when it is started again.

[0058] After the machine is shut down due to belt breakage, the broken pole pieces will pile up, wrinkle and break, and cannot flow into the next process normally, and are generally scrapped; therefore, the higher the detection sensitivity and the faster the response speed, the less pole piece waste will be. After the machine is shut down due to belt breakage, the unbroken pole pieces will be normally collected into the roll without additional processing and flow into the next process normally.

[0059] The present invention provides a method for detecting belt breakage after slitting by a roller divider. During the operation of the roller divider, the position of the lower battery pole piece is detected by an inductive sensor. If a battery pole piece exists, real-time detection is continuously performed, and based on the detection signal of the real-time detection, it is determined whether the battery pole piece is broken; if the battery pole piece is broken, the roller divider is controlled to stop. Compared with the traditional tension detection method, the present invention uses an inductive sensor detection method to realize belt breakage detection, which is not limited by tension, width, pole piece speed and material, and realizes accurate detection of battery pole piece broken belts under different working conditions, improves the accuracy of lithium battery pole piece broken belt detection, and avoids waste of battery pole piece materials.

[0060] It should be noted that the present invention uses diffuse reflection sensors for belt break detection, which will automatically determine the belt break operation status of the equipment during the operation of the equipment, reducing manual operation. The response speed is fast, the detection efficiency is high, and an abnormal signal is sent out immediately after the belt break problem occurs, reducing material waste. The accuracy is high and it is not easy to make misjudgments; it has high product compatibility and can detect the single-axis multi-width winding situation at the same time; it has low requirements on equipment speed and can be checked normally regardless of high or low speed; the detection device has low cost and is easy to install and debug.

[0061] Traditionally, the method of judging whether a belt break occurs based on the material tension has a hysteresis when applied to the case of winding a single shaft and a single width, and when winding a single shaft and multiple widths, it is impossible to effectively judge a single width belt break by the tension, thus causing a misjudgment. The present invention uses the diffuse reflection sensor to detect the change in the distance between the sensor and the material as a judgment condition, and can accurately and timely judge whether the equipment has a belt break and whether it can operate normally, regardless of whether it is used for winding a single shaft and a single width or a single shaft and multiple widths.

[0062] Optional, such as Figure 4 As shown, a winding drum is arranged behind the roller separator, and the battery electrode sheet is wound by the winding drum after passing through the second roller of the roller separator; a rotation speed sensor is arranged inside the winding drum, and a winding diameter detection sensor is arranged outside the winding drum.

[0063] Correspondingly, the method for detecting broken belts after slitting by a roller slitting machine provided in the embodiment of the present invention further includes steps S201-S204.

[0064] S201, detecting the coil diameter of the battery electrode sheet outside the winding drum by means of the coil diameter detection sensor.

[0065] S202, detecting the rotation speed of the winding drum by means of the rotation speed sensor.

[0066] S203, calculating 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 outside the winding barrel.

[0067] It should be noted that the embodiment of the present invention can judge by the rotation speed of the winding drum, and the drum broken belt detection is only used for slip shaft winding; the winding belt is broken by judging whether the winding is broken by the equipment running speed and the difference between the slip shaft running speed and the winding drum speed.

[0068] like Figure 4 As shown in the figure, a magnetic induction sensor, i.e., a speed sensor, is added to the side of the slip shaft and the barrel. Every time the barrel rotates one circle, the magnetic induction sensor sends a pulse signal to the PLC controller. The barrel running speed can be calculated by reading the pulse signal. The current coil diameter value is calculated by the coil diameter sensor, and the material linear speed can be calculated based on the current coil diameter.

[0069] As a possible implementation manner, step S203 can be specifically implemented as steps C1-C2.

[0070] C1. Based on the transmission speed of the battery pole piece, the linear speed of the slip shaft is determined by adopting the slip shaft speed ratio method.

[0071] C2. Determine the rotation speed of the slip shaft in the winding barrel based on the linear speed of the slip shaft and the winding diameter of the battery pole piece outside the winding barrel.

[0072] As a possible implementation manner, step S203 may also be specifically implemented as steps D1-D2.

[0073] D1. Based on the transmission speed of the battery pole piece, the linear speed of the slip shaft is determined by adopting the slip shaft speed difference method.

[0074] D2. Determine the rotation speed of the slip shaft in the winding barrel based on the linear speed of the slip shaft and the winding diameter of the battery pole piece outside the winding barrel.

[0075] For example, the winding slip axis speed is generally higher than the barrel line speed, otherwise constant tension cannot be guaranteed: There are generally two ways: 1. Slip shaft speed ratio method: Y=XK; 2. Slip shaft speed difference mode: Y=X+B; Among them, Y: winding slip axis running line speed; X: equipment running speed; K: speed coefficient; (generally 1.2-1.4 times) B: speed difference constant. (Generally 10-15 meters / minute) For example: the equipment running speed is 60 m / min; the winding diameter is 500 mm; because the barrel is pulled by the material, the barrel linear speed is the equipment running speed, that is, the transmission speed of the battery electrode, 60 m / min.

[0076] (1) Calculation of barrel speed: The speed formula n = v / (πd) shows that when the roll diameter is 500 mm, the barrel rotates 38.21 times per minute. During normal operation, the sensor sends 38 pulse signals per minute, about 1.57 seconds per pulse.

[0077] (2) Speed ​​calculation using the slip shaft speed ratio method: Taking 1.2 times as an example, the equipment runs at 60 m / min and the slip shaft runs at 72 m / min. The speed formula n = v / (πd) shows that when the roll diameter is 500 mm, the slip shaft rotates 45.85 times per minute. During operation, the sensor sends 45 pulse signals per minute, about 1.30 seconds per pulse.

[0078] (3) Speed ​​calculation of slip shaft speed difference method: Taking the speed difference of 10 m / min as an example, the equipment runs at 60 m / min, and the slip shaft runs at 70 m / min; According to the speed formula n = v / (πd), when the coil diameter is 500 mm, the slip shaft rotates 44.58 times per minute. During operation, the sensor sends 44 pulse signals per minute, about 1.34 seconds per pulse.

[0079] Through the above calculation, it can be concluded that when the equipment runs at 60 m / min, taking the speed difference of the slip shaft at 10 m / min as an example, the slip shaft detection signal is 44 / min; the barrel detection signal is 38 / min. If there is a broken belt in the battery electrode, the barrel speed will be increased by 70 m / min. At that time, the barrel detection signal will increase, which can be judged as a broken belt state; a stop command needs to be issued.

[0080] 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, determining whether the battery electrode sheet is broken.

[0081] 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 is wound normally.

[0082] In another exemplary embodiment, 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 is broken.

[0083] Optionally, the method for detecting broken belts after slitting by a roller slitting machine provided in the embodiment of the present invention further includes steps S301-S302 after step S104.

[0084] S301, determining the rolled length of the battery electrode sheet based on the running time of the roller separator and the transmission speed of the battery electrode sheet; S302: Generate an alarm message based on the rolled length of the battery electrode and the downtime of the roller machine.

[0085] In some embodiments, the alarm information includes the wound length and the downtime of the roll feeder.

[0086] S302: Send an alarm message to the user to prompt the user to clean up the waste battery electrodes.

[0087] In this way, the embodiment of the present invention can send an alarm message to the user when the roller separator stops, prompting the user to clean up the waste battery pole pieces, thereby facilitating the production of battery pole pieces.

[0088] Optionally, the method for detecting broken belts after slitting by a roller slitting machine provided in an embodiment of the present invention further includes steps S401-S403.

[0089] S401, obtaining the rotation speed of the roller of the roller extension machine in the current time period.

[0090] In some embodiments, the rotation speed of the roller of the roller dividing machine represents the winding speed of the battery electrode sheet. The faster the rotation speed of the roller of the roller dividing machine, the faster the winding speed of the battery electrode sheet. The slower the rotation speed of the roller of the roller dividing machine, the slower the winding speed of the battery electrode sheet.

[0091] S402, calculating the ratio of the rotation speed to the standard speed.

[0092] S403: Determine a set distance for the current period based on the ratio of the rotation speed to the standard speed and the standard set distance.

[0093] In some embodiments, the standard set distance corresponds to a standard speed.

[0094] It should be noted that the rotation speed of the roller of the roller divider is inversely proportional to the set distance. The faster the rotation speed of the roller of the roller divider and the smaller the set distance, the faster the response speed of the broken belt detection is, thereby adapting to the winding speed of the battery pole piece.

[0095] In this way, the embodiment of the present invention can dynamically adjust the set distance according to the rotation speed of the roller of the roller divider, that is, dynamically adjust the broken belt detection response speed, so that the broken belt detection response speed is adapted to the winding speed of the battery electrode, thereby improving the accuracy of the broken belt detection of the battery electrode.

[0096] Optionally, the method for detecting broken belts after slitting by a roller slitting machine provided in an embodiment of the present invention further includes steps S501-S503.

[0097] S501: Obtain detection sensitivity of user input.

[0098] S502: Determine the droop change ratio of the battery electrode based on the detection sensitivity.

[0099] In some embodiments, the droop change ratio is used to indicate the boundary point between the normal state and the broken state of the battery electrode.

[0100] S503: Determine a set distance based on the droop change ratio of the battery pole piece and the installation distance of the diffuse reflection sensor.

[0101] In some embodiments, the installation distance is the distance between the diffuse reflection sensor and the battery electrode when the battery electrode is in a normal state.

[0102] 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 belt break detection, which improves user convenience.

[0103] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0104] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0105] Figure 5 The structure diagram of a device for detecting broken belts after slitting by a roller slitting machine provided by an embodiment of the present invention is shown. The device for detecting broken belts 600 comprises a communication module 601 and a processing module 602 .

[0106] The communication module 601 is used to obtain the detection signal of the position of the lower battery electrode by the induction sensor during the operation of the roller extension machine.

[0107] The processing module 602 is used to determine whether there is a battery pole sheet at the lower battery pole sheet position based on the detection signal; if there is a battery pole sheet at the lower battery pole sheet position, the detection signal is continuously detected in real time, and based on the detection signal detected in real time, it is determined whether the battery pole sheet is broken; if the battery pole sheet is broken, the roller extension machine is controlled to stop.

[0108] Figure 6 Schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 6 As 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-mentioned method embodiments are implemented, for example Figure 2Alternatively, when the processor 701 executes the computer program 703, the functions of each module / unit in the above-mentioned device embodiments are implemented, for example, Figure 5 The functions of the communication module 601 and the processing module 602 are shown.

[0109] Exemplarily, the computer program 703 may be divided into one or more modules / units, which are stored in the memory 702 and executed by the processor 701 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments that can implement specific functions, and the 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 may be divided into Figure 5 A communication module 601 and a processing module 602 are shown.

[0110] The processor 701 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0111] 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 an 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.

[0112] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for detecting broken belts after slitting by a roller slitting machine, characterized in that: Applied to a roller separator, the roller separator includes a first roller and a second roller arranged horizontally, and an inductive sensor arranged between the first roller and the second roller. After the battery electrode is cut, it moves around the first roller, passes through the lower part of the inductive sensor, and around the second roller to perform a reel movement. The method includes: Acquire the detection signal of the position of the lower battery pole piece by the induction sensor during the operation of the roller extension machine; Based on the detection signal, determining whether there is a battery pole piece at the lower battery pole piece position; If there is a battery pole piece at the lower battery pole piece position, continuously detecting the detection signal in real time, and determining whether the battery pole piece is broken based on the detection signal detected in real time; If the battery pole piece is broken, the roller dividing machine is controlled to stop.

2. The method for detecting broken belt after slitting by a roller slitting machine according to claim 1, characterized in that: The induction sensor is a diffuse reflection sensor; Accordingly, the method of determining whether the battery electrode is broken based on the detection signal detected in real time includes: Determining whether there is a battery pole piece at the lower battery pole piece position based on a detection signal detected in real time; If the position of the lower battery electrode sheet changes from the presence of the battery electrode sheet to the absence of the battery electrode sheet, determining whether the battery electrode sheet is broken; If the battery electrode sheet exists at the lower battery electrode sheet position and remains unchanged, it is determined that the battery electrode sheet is rolled up normally.

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

4. The method for detecting broken belt after slitting by a roller slitting machine according to claim 3, characterized in that: The method of determining whether the battery electrode is broken based on the detection signal detected in real time includes: Based on the detection signal detected in real time, determining the real-time distance between the battery electrode 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, it is determined that the battery electrode is broken; 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 rolled up normally.

5. The method for detecting broken belt after slitting by a roller slitting machine according to claim 1, characterized in that: A winding drum is arranged behind the roller separator, and the battery electrode sheet is wound by the winding drum after passing through the second roller of the roller separator; a rotation speed sensor is arranged inside the winding drum, and a winding diameter detection sensor is arranged outside the winding drum; The method further comprises: The coil diameter detection sensor is used to detect the coil diameter of the battery electrode sheet outside the coiling barrel; The rotation speed of the winding drum is detected by the rotation speed sensor; Calculate the rotation speed of the slip shaft in the winding barrel based on the transmission speed of the battery pole piece and the winding diameter of the battery pole piece outside the winding barrel; Based on the rotation speed of the winding barrel, the rotation speed of the slip shaft in the winding barrel is taken as a preset threshold to determine whether the battery electrode sheet is broken.

6. The method for detecting broken belt after slitting by a roller slitting machine according to claim 5, characterized in that: The calculation of the rotation speed of the slip shaft in the winding barrel based on the transmission speed of the battery pole piece and the winding diameter of the battery pole piece outside the winding barrel includes: Based on the transmission speed of the battery pole piece, the linear speed of the slip shaft is determined by adopting the slip shaft speed ratio method; The rotation speed of the slip shaft in the winding barrel is determined based on the linear speed of the slip shaft and the winding diameter of the battery pole piece outside the winding barrel.

7. The method for detecting broken belt after slitting by a roller slitting machine according to claim 5, characterized in that: The calculation of the rotation speed of the slip shaft in the winding barrel based on the transmission speed of the battery pole piece and the winding diameter of the battery pole piece outside the winding barrel includes: Based on the transmission speed of the battery pole piece, the linear speed of the slip shaft is determined by adopting the slip shaft speed difference method; The rotation speed of the slip shaft in the winding barrel is determined based on the linear speed of the slip shaft and the winding diameter of the battery pole piece outside the winding barrel.

8. The method for detecting broken belt after slitting by a roller slitting machine according to claim 5, characterized in that: The method of determining whether the battery electrode sheet is broken based on the rotation speed of the winding barrel and taking the rotation speed of the slip shaft in the winding barrel as a preset threshold value comprises: 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 is wound normally; 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 is broken.

9. A device for detecting broken belts after slitting by a roller slitting machine, characterized in that: Applied to a roller separator, the roller separator includes a first roller and a second roller arranged horizontally, and an inductive sensor arranged between the first roller and the second roller. After the battery pole piece is cut, it moves around the first roller, passes through the lower part of the inductive sensor, and moves around the second roller. The broken belt detection device includes: A communication module is used to obtain a detection signal of the position of the lower battery electrode by the induction sensor during the operation of the roller extension machine; The processing module is used to determine whether there is a battery pole sheet at the lower battery pole sheet position based on the detection signal; if there is a battery pole sheet at the lower battery pole sheet position, the detection signal is continuously detected in real time, and based on the detection signal detected in real time, it is determined whether the battery pole sheet is broken; if the battery pole sheet is broken, the roller divider is controlled to stop.

10. A roller separator, characterized in that: The roller separator includes a first roller and a second roller arranged horizontally, an inductive sensor arranged between the first roller and the second roller, and a control device. After the battery pole piece is cut, it rolls around the first roller, passes through the lower part of the inductive sensor, and rolls around the second roller. The control device executes the method as described in any one of claims 1 to 8 to realize the detection of broken battery pole pieces.

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