A method and system for edge correction of lithium battery separators in a shaking condition

Abstract

The application provides a lithium battery diaphragm edge deviation correction method and system in a vibration condition, comprising the following steps: S1, obtaining the edge line pixel coordinates of the reference diaphragm edge in the reference image shot by the camera device arranged in parallel behind the feeding roller when the coiled material is not started; S2, obtaining the first offset distance generated between the feeding roller and the camera device in the vibration condition at the time point t when the coiled material is started; S3, obtaining the real-time image shot by the camera device at the time point t+1 when the coiled material is started; S4, obtaining the second offset distance generated between the color diaphragm edge and the reference diaphragm edge in the vibration condition; S5, calculating according to the first offset distance and the second offset distance to obtain the actual correction distance of the lithium battery diaphragm edge in the vibration condition, and sending the real-time correction distance to the correction device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery separator edge deviation correction, in particular to a lithium battery separator edge deviation correction method and system under vibration. BACKGROUND

[0002] In the structure of lithium battery, the separator is one of the key inner components. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, and directly affects the capacity, cycle and safety performance, etc. of the battery. The separator with excellent performance plays an important role in improving the comprehensive performance of the battery. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent short circuit caused by the contact of the two electrodes. In addition, the separator also has the function of allowing electrolyte ions to pass through. The separator material is non-conductive, and its physical and chemical properties have a great influence on the performance of the battery. Different types of batteries use different separators. For lithium battery series, since the electrolyte is an organic solvent system, a separator material resistant to organic solvents is required, and a high-strength thin polyolefin porous film is generally used.

[0003] During the production of lithium battery separator, the separator wound on the roller often deviates during unwinding, so a special device is needed to prevent the deviation of the separator. At present, the commonly used method is to use a deviation correction roller to clamp the edge position of the separator, thereby changing the moving path of the separator to achieve the effect of deviation correction.

[0004] Among them, in order to be able to correct the deviation of the correction roller according to the deviation distance of the separator, a camera is generally used to take pictures in the vicinity. If the image taken by the camera deviates, it indicates that the separator has deviated. The deviation distance is used to operate the correction roller accordingly. However, since the feeding roller is generally arranged above, it is easy to vibrate or be easily impacted by external force during the winding process, which causes the feeding roller to deviate at this time point, and the image taken by the camera at this time point deviates. If the deviation distance is directly used to operate the correction roller for deviation correction, it will lead to inaccurate deviation correction, because the deviation distance obtained by the camera does not take into account the vibration deviation. SUMMARY

[0005] The purpose of the present application is to provide a lithium battery separator edge deviation correction method and system under vibration. The method not only uses a camera device to take pictures of the separator edge to obtain a second deviation distance, but also sets a pair of photoelectric sensing devices in front of the feeding roller and behind the camera device. The photoelectric sensing devices can monitor whether the feeding roller and the camera device vibrate and obtain a first deviation distance generated between the feeding roller and the camera device under vibration. By calculating the first deviation distance and the second deviation distance, a more accurate actual deviation distance is obtained, and the real-time deviation distance is sent to the deviation correction device for deviation correction.

[0006] Specifically comprising the following steps:

[0007] S1, obtaining the edge line pixel coordinates of the reference diaphragm edge in the reference image photographed by the camera device arranged in parallel behind the feeding roller, below which is the roll roller, and the lithium battery diaphragm passes through the feeding roller to the roll roller below, the camera device photographs in parallel towards the feeding roller, and the width of the feeding roller covers the reference image;

[0008] S2, at the time point t when the roll starts, obtaining the light signal emitted by the optical fiber emitting end arranged in front of the feeding roller or behind the camera device vertically towards the optical fiber receiving plate arranged behind the camera device or in front of the feeding roller, and determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position label of the optical fiber receiving plate receiving the light signal;

[0009] S3, at the time point t+1 when the roll starts, obtaining the real-time image photographed by the camera device, which includes the color difference diaphragm edge of the lithium battery diaphragm on the roll roller at the time point t+1;

[0010] S4, corresponding the reference diaphragm edge to the real-time image according to the edge line pixel coordinates of the reference diaphragm edge in the reference image, and then performing local pixel processing on the real-time image to obtain the second offset distance between the color difference diaphragm edge and the reference diaphragm edge under the vibration condition;

[0011] S5, calculating the first offset distance between the feeding roller and the camera device under the vibration condition and the second offset distance between the color difference diaphragm edge and the reference diaphragm edge under the vibration condition to obtain the actual correction distance of the lithium battery diaphragm edge under the vibration condition, and sending the real-time correction distance to the correction device.

[0012] Further, the S4 specifically comprises the following steps:

[0013] S41, constructing a pixel coordinate system for the real-time image, and bringing the reference diaphragm edge into the real-time image according to the position of the edge line pixel coordinates of the reference diaphragm edge in the reference image in the pixel coordinate system;

[0014] S42, performing vertical cutting on the excess part of the real-time image to obtain a local real-time image, which includes the reference diaphragm edge, the color difference diaphragm edge, and the local image between the reference diaphragm edge and the color difference diaphragm edge;

[0015] S43, performing pixel block statistical processing on the color difference diaphragm edge in the local real-time image to obtain the edge line pixel coordinates of the color difference diaphragm edge;

[0016] S44, determining the second offset distance between the abnormal-color diaphragm edge and the reference diaphragm edge under the vibration condition according to the edge-pixel coordinates of the abnormal-color diaphragm edge and the edge-pixel coordinates of the reference diaphragm edge;

[0017] Further, in S43, the abnormal-color diaphragm edge is subjected to pixel block statistical processing in the local real-time image to obtain the specific process of the edge-pixel coordinates of the abnormal-color diaphragm edge:

[0018] The local real-time image is recognized to obtain the pixel blocks in which the abnormal-color diaphragm edge falls on the pixel coordinate system, and the pixel blocks in the same column are subjected to vertical quantity statistics to obtain the column-pixel-block vertical statistics;

[0019] It is judged whether the column-pixel-block vertical statistics of the outermost column is greater than a threshold value, if yes, the pixel coordinates of the outermost column are taken as the edge-pixel coordinates of the abnormal-color diaphragm edge, if not, the pixel coordinates of the column with the most column-pixel-block vertical statistics are taken as the edge-pixel coordinates of the abnormal-color diaphragm edge.

[0020] Further, in S44, the specific process of determining the second offset distance between the abnormal-color diaphragm edge and the reference diaphragm edge under the vibration condition according to the edge-pixel coordinates of the abnormal-color diaphragm edge and the edge-pixel coordinates of the reference diaphragm edge is as follows:

[0021] First, the actual width value corresponding to each pixel block is determined according to the ratio of the pixel when the width of the feeding roller covers the reference image to the actual size of the feeding roller, and then the second offset distance between the abnormal-color diaphragm edge and the reference diaphragm edge under the vibration condition is determined according to the number of pixel blocks in which the horizontal coordinates of the edge-pixel coordinates of the abnormal-color diaphragm edge and the edge-pixel coordinates of the reference diaphragm edge are different.

[0022] Further, in S2, the specific process of obtaining the light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device or the camera device is as follows:

[0023] The light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device or the light signal emitted by the optical fiber transmitting end arranged on the rear side of the camera device vertically towards the optical fiber receiving plate arranged on the front side of the feeding roller is obtained.

[0024] Further, the optical fiber receiving plate comprises a central optical fiber receiving plate, split optical fiber receiving plates respectively arranged on the left and right sides of the central optical fiber receiving plate and symmetrically arranged about the central optical fiber receiving plate, one split optical fiber receiving plate corresponds to one position label, and the position label comprises the offset direction of the split optical fiber receiving plate relative to the central optical fiber receiving plate and the offset distance of the split optical fiber receiving plate relative to the central optical fiber receiving plate.

[0025] Further, in S2, the specific process of determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position tag of the optical fiber receiving plate receiving the optical signal is as follows:

[0026] According to the position tag of the optical fiber receiving plate receiving the optical signal, the offset direction of the optical fiber receiving plate relative to the center optical fiber receiving plate and the offset distance of the optical fiber receiving plate relative to the center optical fiber receiving plate are obtained, and the offset direction and the offset distance are taken as the first offset distance.

[0027] Further, in S5, the first offset distance or the second offset distance is a numerical value with a positive or negative sign, the positive sign indicates that it is located on the left side of the reference diaphragm edge or on the left side of the center optical fiber receiving plate, and the negative sign indicates that it is located on the right side of the reference diaphragm edge or on the right side of the center optical fiber receiving plate. The actual correction distance of the lithium battery diaphragm edge under the vibration condition is obtained by subtracting the first offset distance from the second offset distance, and the real-time correction distance is sent to the correction device.

[0028] A lithium battery diaphragm edge correction system under a vibration condition, comprising a feeding roller and a coiled material roller, and further comprising a reference diaphragm edge edge line pixel coordinate in a reference image photographed by a camera device arranged in parallel behind the feeding roller, wherein the feeding roller is below the coiled material roller, and the lithium battery diaphragm is transported to the coiled material roller below through the feeding roller,

[0029] A pair of photoelectric sensing devices, comprising a fiber emitting end, a fiber receiving plate corresponding to the fiber emitting end, and a photoelectric converter, wherein the fiber emitting end is arranged on the front side of the feeding roller or the rear side of the camera device, the fiber receiving plate is arranged on the rear side of the camera device or the front side of the feeding roller, the fiber emitting end is used to emit an optical signal to the fiber receiving plate, and the optical signal is transmitted to the photoelectric converter, the optical signal is converted into an electrical signal through the photoelectric converter, and the electrical signal is transmitted to a server;

[0030] The server is connected with the photoelectric sensing device, receives the electrical signal, determines the first offset distance between the feeding roller and the camera device under the vibration condition according to the position tag corresponding to the electrical signal, is connected with the camera device, is used to obtain the image photographed by the camera device, takes the image obtained when the coiled material is not started as a reference image, and obtains the edge line pixel coordinate of the reference diaphragm edge in the reference image, takes the image obtained when the coiled material is started as a real-time image and records the time point of obtaining, and obtains the second offset distance between the heterochromatic diaphragm edge and the reference diaphragm edge in the real-time image under the vibration condition, calculates the second offset distance obtained after the first offset distance is obtained, obtains the actual correction distance of the lithium battery diaphragm edge under the vibration condition, and sends the real-time correction distance to a correction device;

[0031] The deviation correcting device receives a real-time deviation correcting distance and corrects the deviation of the lithium battery diaphragm in front of the feeding roller according to the real-time deviation correcting distance.

[0032] Further, the deviation correcting device is arranged in front of the feeding roller, and two deviation correcting devices are symmetrically arranged in front of the feeding roller, and the interval of the working ends of the two deviation correcting devices is matched with the width of the lithium battery diaphragm.

[0033] The present application has the following beneficial effects:

[0034] The present application aims to provide a lithium battery diaphragm edge deviation correcting method and system in a vibration condition, which not only uses a camera device to shoot the diaphragm edge to obtain a second deviation distance, but also arranges a pair of photoelectric sensing devices at the front side of the feeding roller and the rear side of the camera device, so as to monitor whether the feeding roller and the camera device vibrate and obtain a first deviation distance generated between the feeding roller and the camera device in the vibration condition, calculate the first deviation distance and the second deviation distance to obtain a more accurate actual deviation correcting distance, and send the real-time deviation correcting distance to the deviation correcting device to make it correct the deviation. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a flowchart of the present application.

[0036] Figure 2 It is an interaction diagram of the present application.

[0037] Figure 3 It is a front view structural diagram of the system in the present application.

[0038] Figure 4 It is a top view structural diagram of the system in the present application.

[0039] Figure 5 It is a schematic diagram of the optical fiber transmitting end and the optical fiber receiving plate in the present application.

[0040] Figure 6 It is a schematic diagram of obtaining a local real-time image in the present application.

[0041] Figure 7 It is a schematic diagram of obtaining a pixel block column direction statistical quantity of a color different diaphragm edge in a local real-time image in the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one example embodiment is merely illustrative in nature and not intended to be limiting on the application or its application or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort fall within the scope of the present application.

[0043] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application, unless otherwise specifically stated.

[0044] Meanwhile, it should be understood that the sizes of the various portions shown in the drawings are not drawn in proportion for the convenience of description.

[0045] In addition, descriptions of well-known structures, functions, and configurations can be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the disclosure.

[0046] Techniques, methods, and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the enabling disclosure where appropriate.

[0047] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of example embodiments can have different values.

[0048] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments:

[0049] Embodiment 1

[0050] As shown in Figure 1 , Figure 2 , a lithium battery separator edge correction method in a vibration situation specifically includes the following steps:

[0051] S1, when the coiled material has not started, obtain the edge line pixel coordinates of the reference separator edge in the reference image photographed by the camera device arranged parallel to the rear of the feeding roller, the feeding roller below is the coiled material roller, the lithium battery separator is transported to the coiled material roller below through the feeding roller, the camera device is parallel to the feeding roller for photographing, and the width of the feeding roller fills the reference image;

[0052] S2, obtaining the light signal emitted by the optical fiber emitting end arranged at the front side of the feeding roller or the rear side of the camera device vertically towards the optical fiber receiving plate arranged at the rear side of the camera device or the front side of the feeding roller, and determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position tag of the optical fiber receiving plate receiving the light signal;

[0053] S3, obtaining the real-time image photographed by the camera device at the time point t+1 when the roll material is started, and the real-time image includes the color difference separator edge of the lithium battery separator located on the roll material roller at the time point t+1;

[0054] S4, corresponding the reference separator edge to the real-time image according to the edge line pixel coordinates of the reference separator edge in the reference image, and performing local pixel processing on the real-time image to obtain the second offset distance between the color difference separator edge and the reference separator edge under the vibration condition;

[0055] S5, calculating the actual correction distance of the lithium battery separator edge under the vibration condition according to the first offset distance between the feeding roller and the camera device under the vibration condition and the second offset distance between the color difference separator edge and the reference separator edge under the vibration condition, and sending the real-time correction distance to the correction device.

[0056] Preferably, the S4 specifically includes the following steps:

[0057] S41, constructing a pixel coordinate system for the real-time image, and bringing the reference separator edge into the real-time image according to the position of the edge line pixel coordinates of the reference separator edge in the reference image in the pixel coordinate system;

[0058] S42, performing vertical cutting on the excess part of the real-time image to obtain a local real-time image, and the local real-time image includes the reference separator edge, the color difference separator edge, and the local image between the reference separator edge and the color difference separator edge;

[0059] S43, performing pixel block statistical processing on the color difference separator edge in the local real-time image to obtain the edge line pixel coordinates of the color difference separator edge;

[0060] S44, determining the second offset distance between the color difference separator edge and the reference separator edge under the vibration condition according to the edge line pixel coordinates of the color difference separator edge and the edge line pixel coordinates of the reference separator edge;

[0061] Preferably, in the S43, the specific process of performing pixel block statistical processing on the color difference separator edge in the local real-time image to obtain the edge line pixel coordinates of the color difference separator edge is as follows:

[0062] Identifying the local real-time image to obtain pixel blocks of the heterochromatic septum edge falling into a pixel coordinate system, and counting the pixel blocks in the same column longitudinally to obtain column direction statistics of the pixel blocks;

[0063] Determining whether the column direction statistics of the pixel blocks in the outermost column is greater than a threshold value, if yes, taking the pixel coordinates of the outermost column as the edge line pixel coordinates of the heterochromatic septum edge, if no, taking the pixel coordinates of the column with the most column direction statistics of the pixel blocks as the edge line pixel coordinates of the heterochromatic septum edge.

[0064] Preferably, in S44, the specific process of determining the second offset distance between the heterochromatic septum edge and the reference septum edge under the vibration condition according to the edge line pixel coordinates of the heterochromatic septum edge and the edge line pixel coordinates of the reference septum edge is as follows:

[0065] First, determining the actual width value corresponding to each pixel block according to the ratio of the pixel when the width of the feeding roller fills the reference image to the actual size of the feeding roller, and then determining the second offset distance between the heterochromatic septum edge and the reference septum edge under the vibration condition according to the number of pixel blocks of the difference between the horizontal coordinates of the edge line pixel coordinates of the heterochromatic septum edge and the edge line pixel coordinates of the reference septum edge.

[0066] Preferably, in S2, the specific process of obtaining the light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device is as follows:

[0067] Obtaining the light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device or the light signal emitted by the optical fiber transmitting end arranged on the rear side of the camera device vertically towards the optical fiber receiving plate arranged on the front side of the feeding roller.

[0068] Preferably, the optical fiber receiving plate comprises a center optical fiber receiving plate, split optical fiber receiving plates respectively arranged on the left and right sides of the center optical fiber receiving plate and symmetrically arranged about the center optical fiber receiving plate, one split optical fiber receiving plate corresponds to one position label, and the position label comprises an offset direction of the split optical fiber receiving plate relative to the center optical fiber receiving plate and an offset distance of the split optical fiber receiving plate relative to the center optical fiber receiving plate.

[0069] Preferably, in S2, the specific process of determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position label of the optical fiber receiving plate receiving the light signal is as follows:

[0070] According to the position label of the split optical fiber receiving plate receiving the light signal, obtaining the offset direction of the split optical fiber receiving plate relative to the center optical fiber receiving plate and the offset distance of the split optical fiber receiving plate relative to the center optical fiber receiving plate, and taking the offset direction and the offset distance as the first offset distance.

[0071] Preferably, in S5, the first offset distance or the second offset distance is a value with a positive or negative sign. A positive sign indicates that it is located on the left side of the reference diaphragm or on the left side of the central optical fiber receiving plate, and a negative sign indicates that it is located on the right side of the reference diaphragm or on the right side of the central optical fiber receiving plate. The second offset distance is subtracted from the first offset distance to obtain the actual correction distance of the lithium battery diaphragm under vibration, and the real-time correction distance is sent to the correction device.

[0072] Based on the above principles, the present invention will be further described as follows:

[0073] During the production of lithium battery separators, the separators wound on the rollers often deviate in position when unwound. Therefore, special devices are needed to prevent the separators from deviating. Currently, the commonly used method is to use a correction roller to clamp the edge of the separator, thereby changing the movement path of the separator and achieving the effect of correction.

[0074] In order to perform correction operations on the correction roller based on the diaphragm offset distance, a camera is usually used to capture images at a nearby location. If the image captured by the camera is offset, it indicates that the diaphragm has offset, and the correction roller is operated accordingly based on this offset distance. However, since the feeding roller is usually located at the top, it is prone to vibration or impact during the winding process. This causes the feeding roller to vibrate and offset at a certain point in time, resulting in an offset in the image captured by the camera at that point in time. If this offset distance is directly used to operate the correction roller for correction, it will lead to inaccurate correction because the offset distance captured by the camera does not take into account vibration offset.

[0075] Therefore, based on obtaining the offset distance of the diaphragm edge using a camera device, this invention also considers that if the feeding roller or camera device vibrates during the start of the roll material movement, or is offset by an external force collision, the offset distance in the image captured by the camera will have a certain error compared to the actual offset distance. If the error is small, in practice, it is not necessary to correct the offset distance. However, if the error is large, the correction device will adjust the originally unoffset or slightly offset diaphragm edge to a slightly offset diaphragm edge, making the subsequent correction work more inaccurate.

[0076] like Figure 3 , Figure 4As shown, the present invention has a camera device installed parallel to the rear of the last feeding roller, and the roll material roller is located below the last feeding roller, so that the camera device is parallel to the feeding roller to take pictures and obtain the offset of the diaphragm edge captured by the camera device. A photoelectric receiving plate is installed on the bracket on which the camera device is installed, and a photoelectric emitting end is installed on the bracket on which the last feeding roller is installed, parallel to the photoelectric receiving plate, so that the photoelectric receiving plate can receive the light signal emitted by the photoelectric emitting end.

[0077] In one embodiment, the photoelectric transmitter emits light parallel to the photoelectric receiver, which collects the parallel light spot to obtain an optical signal. The optical signal is transmitted through a transmission optical fiber to a photoelectric converter, which converts the optical signal into an electrical signal and determines the first offset distance caused by the vibration based on the electrical signal. The process of the photoelectric transmitter emitting the optical signal parallel to the photoelectric receiver, causing the photoelectric receiver to collect the parallel light spot and obtain the optical signal, and the photoelectric converter converting the optical signal into an electrical signal, is conventional technology and will not be described in detail here.

[0078] Specifically, a reference image before the roll of material is started and a real-time image after the roll of material is started are acquired by a camera device. By comparing the different colored diaphragm edge where the diaphragm edge is located in the real-time image with the reference diaphragm edge where the diaphragm edge should be in the preset reference image, the first offset distance captured by the camera device can be obtained. The first offset distance can include the offset distance caused by the offset of the diaphragm edge, and can also include the offset distance caused by the vibration of the feeding roller or the camera device. Since the vibration of the feeding roller or the camera device is only a temporary offset data and will not affect the subsequent offset of the diaphragm edge, it is not necessary to correct the diaphragm edge based on the offset data generated by the vibration of the feeding roller or the camera device.

[0079] Therefore, in order to exclude the offset data caused by vibration of the feeding roller or the camera equipment from the offset distance captured by the camera equipment, the present invention sets up a monitoring device between the feeding roller and the camera equipment to monitor the relative offset data caused by vibration of the feeding roller and the camera equipment. The second offset distance can be determined by setting up optical fiber receiving boards at different positions. When the optical fiber receiving boards at different positions receive optical signals, the second offset distance can be determined by the position of the optical fiber receiving boards.

[0080] like Figure 5As shown, the system includes a central fiber optic receiver board and two branch fiber optic receiver boards located on either side of the central fiber optic receiver board. The central fiber optic receiver board may not have a position label; that is, if the offset distance generated by the vibration is within a preset range, no data correction is needed within this range. When the offset distance exceeds the preset range, i.e., when a branch fiber optic receiver board receives an optical signal, setting different position labels for each branch fiber optic receiver board indicates the offset direction and offset distance relative to the central fiber optic receiver board. For example, +1 indicates that the branch fiber optic receiver board has offset 0.1cm to the right. When a branch fiber optic receiver board receives an optical signal, the position label indicates that the first offset distance is +0.1cm, meaning the vibration caused an offset distance of 0.1cm to the right, which will cause the offset data in the image captured by the camera to be offset 0.1cm to the right. The smaller the spacing between the branch fiber optic receiver boards, the more accurate the vibration offset distance detection. The spacing between the branch fiber optic receiver boards can be set to be equal or unequal.

[0081] Therefore, it is also necessary to correct the second offset distance obtained by the camera device based on the offset data of 0.1cm to the right to obtain the actual correction distance, and transmit the actual correction distance to the correction device to ensure the correction accuracy of the correction device.

[0082] In order to reduce the amount of data processing and improve the efficiency of correction, the present invention also performs local pixel processing on the real-time acquired images, and obtains the second offset distance between the edge of the discolored diaphragm and the edge of the reference diaphragm under vibration by statistically analyzing the local pixel blocks.

[0083] Specifically, such as Figure 6 As shown, when a real-time image is obtained from the camera device, a pixel coordinate system for the real-time image is established. The pixel coordinate system is established with the upper left corner of the real-time image as the origin. The horizontal and vertical coordinates of the pixel are the column number and row number in its image array, respectively. The reference diaphragm edge is mapped to the real-time image according to the edge pixel coordinates (n, 12) of the reference diaphragm edge in the reference image. n refers to the last row in the real-time image. In this real-time image, there are only 17 rows. Therefore, the edge pixel coordinates of the reference diaphragm edge are (17, 12).

[0084] Then, the redundant parts of the real-time image are vertically cut to obtain a local real-time image. The local real-time image includes the reference diaphragm edge, the opposite-color diaphragm edge, and the local image between the reference diaphragm edge and the opposite-color diaphragm edge. When performing vertical cutting, as much redundant blank image as possible is cut off to reduce the amount of data processing. The reference diaphragm edge and the opposite-color diaphragm edge can be extended outward by a certain distance before cutting to ensure the integrity of the data.

[0085] Then, pixel block statistical processing is performed on the local real-time image, such as... Figure 7 As shown, since the camera device in this invention faces the roll material roller, and the roll material roller fills the image of the camera device, when the diaphragm edge appears in the image, the color of the diaphragm edge can be different from that of the roll material roller, making the diaphragm edge a dissimilar color diaphragm edge, which facilitates image recognition. Furthermore, due to the shaking of the shooting device, the dissimilar color diaphragm edge is generally not located in only one column of pixel blocks in the pixel coordinate system, but will fall into multiple columns of pixel blocks. Therefore, this invention identifies the dissimilar color diaphragm edge and performs column-oriented statistics of pixel blocks to determine the edge line of the dissimilar color diaphragm edge, ensuring the accuracy of the correction.

[0086] After obtaining the pixel block column direction statistics for the different-colored diaphragm edge, the statistics are evaluated. It is determined whether the column direction statistics of the outermost pixel block exceed a threshold. If so, the pixel coordinates of the outermost column are used as the edge coordinates of the different-colored diaphragm edge. If not, the pixel coordinates of the column with the highest column direction statistics are used as the edge coordinates of the different-colored diaphragm edge. The purpose is to prevent the edge lines caused by slight shaking from being used as the edge lines of the different-colored diaphragm edge, ensuring the accuracy of the correction.

[0087] In this embodiment, the pixel coordinates of the column with a statistical value of 18 are used as the edge pixel coordinates of the discolored diaphragm edge, which is (18,7). The second offset distance between the discolored diaphragm edge and the reference diaphragm edge under vibration is determined based on the edge pixel coordinates (18,7) of the discolored diaphragm edge and (17,12) of the reference diaphragm edge.

[0088] The second offset distance is calculated using pixel blocks. Therefore, in this invention, the actual width value corresponding to each pixel block is determined by the ratio of the pixel to the actual size of the feeding roller when the width of the feeding roller fills the reference image, and then the second offset distance is calculated based on the actual width value corresponding to each pixel block.

[0089] In this embodiment, the horizontal coordinates of the edge pixel coordinates (18,7) of the opposite-color diaphragm edge and the edge pixel coordinates (17,12) of the reference diaphragm edge differ by 4 pixel blocks. If one pixel block corresponds to 0.1cm, the second offset distance can be calculated as -0.4cm. The negative sign indicates that the opposite-color diaphragm edge is located to the left of the reference diaphragm edge, and the opposite-color diaphragm edge is offset to the left by 0.4cm.

[0090] Subtracting the first offset distance +0.1cm from the second offset distance -0.4cm gives an actual correction distance of -0.3cm. This indicates that at this point in time, the diaphragm edge actually deviated to the left by 0.3cm, so the correction device only needs to be adjusted to the right by 0.3cm.

[0091] This invention adds a variable to the basis of obtaining the correction distance from the image captured by the camera device. The variable is the vibration correction distance that may be generated under vibration. If the optical fiber receiving board receives an optical signal, it indicates that a vibration correction distance has been generated. Then, the second correction distance generated by the camera device is used to correct the distance, so as to ensure the accuracy of the correction method.

[0092] Example 2

[0093] A lithium battery separator edge correction system under vibration includes a feeding roller and a roll roller, and also includes the edge line pixel coordinates of a reference separator edge in a reference image captured by a camera device arranged parallel to the rear of the feeding roller. Below the feeding roller is a roll roller, through which the lithium battery separator is transported to the roll roller below.

[0094] A pair of photoelectric sensing devices includes an optical fiber transmitter, an optical fiber receiver corresponding to the optical fiber transmitter, and a photoelectric converter. The optical fiber transmitter is located on the front side of the feeding roller or the rear side of the camera device. The optical fiber receiver is located on the rear side of the camera device or the front side of the feeding roller. The optical fiber transmitter is used to transmit optical signals to the optical fiber receiver and transmit the optical signals to the photoelectric converter. The photoelectric converter converts the optical signals into electrical signals and transmits the electrical signals to the server.

[0095] The server, connected to a photoelectric sensing device, receives electrical signals and determines the first offset distance between the feeding roller and the camera device under vibration based on the position tag corresponding to the electrical signal. It is also connected to the camera device to acquire images captured by the camera, using the image obtained before the roll is started as a reference image and obtaining the edge pixel coordinates of the reference diaphragm edge in the reference image. The server uses the image obtained when the roll is started as a real-time image and records the acquisition time point, obtaining the second offset distance between the discolored diaphragm edge and the reference diaphragm edge under vibration in the real-time image. The server calculates the second offset distance obtained after obtaining the first offset distance to obtain the actual correction distance of the lithium battery diaphragm edge under vibration, and sends the real-time correction distance to the correction device.

[0096] The correction device receives the real-time correction distance and corrects the alignment of the lithium-ion separator on the front side of the feeding roller according to the real-time correction distance.

[0097] Preferably, the correction device is located in front of the feeding roller; however, the correction device is not located between the photoelectric transmitter and the photoelectric receiver to avoid the correction device blocking the light transmission between the photoelectric transmitter and the photoelectric receiver.

[0098] Specifically, a support frame is provided at one end of the feeding roller, and the support frame extends away from the feeding roller. A photoelectric transmitter is provided on the support frame. A camera device parallel to the front of the feeding roller is also fixed in front of the feeding roller by a camera bracket. The camera bracket is extended, and a photoelectric receiver is set at the corresponding position, so that the photoelectric transmitter is set at the feeding roller and the photoelectric receiver is set at the camera device, so that the photoelectric transmitter and the photoelectric receiver can monitor the first offset distance generated under vibration.

[0099] Then, a support rod extending towards the feeding roller is provided in front of the feeding roller. Two correction devices can be symmetrically provided on the support rod. The distance between the working ends of the two correction devices is adapted to the width of the lithium battery separator. The correction device includes a fixed base and two correction rollers. The fixed base is set on the support rod. The two correction rollers extend along the length of the feeding roller, and both correction rollers can rotate along their own axis. The two correction rollers are distributed on the top and bottom and are hinged to the fixed base. The side of the fixed base is provided with a driving component for driving the opening and closing angle of the two correction rollers.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for edge correction of a lithium battery separator in a vibration condition, characterized by, The method specifically comprises the following steps: S1, obtaining the edge line pixel coordinates of the reference diaphragm edge in a reference image photographed by a camera device arranged in parallel behind a feeding roller, the feeding roller being below a diaphragm roller, the lithium battery diaphragm being transported to the diaphragm roller below through the feeding roller, the camera device photographing in parallel towards the feeding roller, and the width of the feeding roller filling the reference image; S2, obtaining the light signal emitted by the optical fiber emitting end arranged in front of the feeding roller or behind the camera device vertically towards the optical fiber receiving plate arranged behind the camera device or in front of the feeding roller, and determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position label of the optical fiber receiving plate receiving the light signal; S3, obtaining the real-time image photographed by the camera device at the time point t+1 when the diaphragm starts, the real-time image including the color difference diaphragm edge of the lithium battery diaphragm on the diaphragm roller at the time point t+1; S4, corresponding the reference diaphragm edge to the real-time image according to the edge line pixel coordinates of the reference diaphragm edge in the reference image, and performing local pixel processing on the real-time image to obtain the second offset distance between the color difference diaphragm edge and the reference diaphragm edge under the vibration condition; The S4 specifically comprises the following steps: S41, constructing a pixel coordinate system for the real-time image, and bringing the reference diaphragm edge into the real-time image according to the position of the edge line pixel coordinates of the reference diaphragm edge in the reference image in the pixel coordinate system; S42, performing vertical cutting on the excess part of the real-time image to obtain a local real-time image, the local real-time image including the reference diaphragm edge, the color difference diaphragm edge, and the local image between the reference diaphragm edge and the color difference diaphragm edge; S43, performing pixel block statistical processing on the color difference diaphragm edge in the local real-time image to obtain the edge line pixel coordinates of the color difference diaphragm edge; S44, determining the second offset distance between the color difference diaphragm edge and the reference diaphragm edge under the vibration condition according to the edge line pixel coordinates of the color difference diaphragm edge and the edge line pixel coordinates of the reference diaphragm edge; S5, calculating the actual correction distance of the lithium battery diaphragm edge under the vibration condition according to the first offset distance between the feeding roller and the camera device under the vibration condition and the second offset distance between the color difference diaphragm edge and the reference diaphragm edge under the vibration condition, and sending the real-time correction distance to a correction device.

2. The method of claim 1, wherein the method is a method of edge correction of a lithium battery separator in a vibration situation, characterized by, In S43, the specific process of performing pixel block statistical processing on the color difference diaphragm edge in the local real-time image to obtain the edge line pixel coordinates of the color difference diaphragm edge is as follows: identifying the local real-time image to obtain the pixel blocks of the color difference diaphragm edge falling into the pixel coordinate system, and performing longitudinal quantity statistics on the pixel blocks in the same column to obtain the column direction statistical quantity of the pixel blocks; judging whether the column direction statistical quantity of the pixel blocks in the outermost column is greater than a threshold value, if yes, taking the pixel coordinates of the outermost column as the edge line pixel coordinates of the color difference diaphragm edge, and if no, taking the pixel coordinates of the column with the largest column direction statistical quantity of the pixel blocks as the edge line pixel coordinates of the color difference diaphragm edge.

3. The method of claim 2, wherein the method further comprises: In S44, the specific process of determining the second offset distance between the heterochromatic diaphragm edge and the reference diaphragm edge under the vibration condition according to the edge line pixel coordinates of the heterochromatic diaphragm edge and the edge line pixel coordinates of the reference diaphragm edge is as follows: First, the actual width value corresponding to each pixel block is determined according to the ratio of the pixel when the width of the feeding roller covers the reference image to the actual size of the feeding roller, and then the second offset distance between the heterochromatic diaphragm edge and the reference diaphragm edge under the vibration condition is determined according to the number of pixel blocks of the difference between the horizontal coordinates of the edge line pixel coordinates of the heterochromatic diaphragm edge and the edge line pixel coordinates of the reference diaphragm edge.

4. The method of claim 1, wherein the method is a method of edge correction of a lithium battery separator in a vibration condition, characterized by, In S2, the specific process of obtaining the light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device is as follows: The light signal emitted by the optical fiber transmitting end arranged on the front side of the feeding roller vertically towards the optical fiber receiving plate arranged on the rear side of the camera device or the light signal emitted by the optical fiber transmitting end arranged on the rear side of the camera device vertically towards the optical fiber receiving plate arranged on the front side of the feeding roller is obtained.

5. The method of claim 1, wherein the method is a method of edge correction of a lithium battery separator in a vibration condition, characterized by, The optical fiber receiving plate includes a center optical fiber receiving plate, split optical fiber receiving plates respectively arranged on the left and right sides of the center optical fiber receiving plate and symmetrically arranged about the center optical fiber receiving plate, one split optical fiber receiving plate corresponds to one position label, and the position label includes the offset direction of the split optical fiber receiving plate relative to the center optical fiber receiving plate and the offset distance of the split optical fiber receiving plate relative to the center optical fiber receiving plate.

6. The method of claim 5, wherein the method further comprises: In S2, the specific process of determining the first offset distance between the feeding roller and the camera device under the vibration condition according to the position label of the optical fiber receiving plate receiving the light signal is as follows: According to the position label of the split optical fiber receiving plate receiving the light signal, the offset direction of the split optical fiber receiving plate relative to the center optical fiber receiving plate and the offset distance of the split optical fiber receiving plate relative to the center optical fiber receiving plate are obtained, and the offset direction and the offset distance are taken as the first offset distance.

7. The method of claim 5, wherein the method further comprises: In S5, the first offset distance or the second offset distance is a numerical value with a positive or negative sign, the positive sign indicates that the position is on the left side of the reference diaphragm edge or on the left side of the center optical fiber receiving plate, the negative sign indicates that the position is on the right side of the reference diaphragm edge or on the right side of the center optical fiber receiving plate, the second offset distance is subtracted from the first offset distance to obtain the actual offset distance of the lithium battery diaphragm edge under the vibration condition, and the real-time offset distance is sent to the offset correction device.

8. A lithium battery separator edge correction system in a vibration condition, comprising a feeding roller and a roll material roller, characterized in that, The application of the lithium battery diaphragm edge offset correction method under the vibration condition as claimed in any one of claims 1-7 further comprises obtaining the edge line pixel coordinates of the reference diaphragm edge in the reference image photographed by the camera device arranged in parallel behind the feeding roller, the lower side of the feeding roller is a roll roller, and the lithium battery diaphragm is transported to the lower roll roller through the feeding roller, A pair of photoelectric sensing devices, including a fiber optic transmitting end, a fiber optic receiving plate corresponding to the fiber optic transmitting end, and a photoelectric converter, the fiber optic transmitting end is arranged at the rear side of the camera device or the front side of the feeding roller, the fiber optic receiving plate is arranged at the rear side of the camera device or the front side of the feeding roller, the fiber optic transmitting end is used to transmit optical signals to the fiber optic receiving plate, and the optical signals are transmitted to the photoelectric converter, the optical signals are converted into electrical signals by the photoelectric converter, and the electrical signals are transmitted to the server; The server is connected with the photoelectric sensing device, receives the electrical signals, determines the first offset distance generated between the feeding roller and the camera device under the vibration condition according to the position tag corresponding to the electrical signals; connected with the camera device, used for obtaining the image shot by the camera device, taking the image obtained when the coiled material is not started as the reference image, and obtaining the edge line pixel coordinates of the reference diaphragm edge in the reference image; taking the image obtained when the coiled material is started as the real-time image and recording the time point of obtaining, and obtaining the second offset distance generated between the color diaphragm edge and the reference diaphragm edge in the real-time image under the vibration condition; calculate the second offset distance obtained after obtaining the first offset distance, obtain the actual correction distance of the lithium battery diaphragm edge under the vibration condition, and send the real-time correction distance to the correction device; The correction device receives the real-time correction distance, and corrects the lithium electronic diaphragm in front of the feeding roller according to the real-time correction distance.

9. A lithium battery separator edge correction system in the event of a shock according to claim 8, wherein, The correction device is arranged in front of the feeding roller, and two correction devices are symmetrically arranged in front of the feeding roller, and the distance between the working ends of the two correction devices is matched with the width of the lithium battery diaphragm.

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