A detection method, device, electronic device and computer-readable storage medium

Abstract

The present application provides a detection method, device, electronic device and computer-readable storage medium. Among them, the method includes: fitting a plurality of first crack line segments on the coating layer to be measured in the first image and a plurality of second crack line segments on the coating layer to be measured in the second image; calculating the coincidence degree between the first crack line segments and the second crack line segments; selecting the maximum coincidence degree from each coincidence degree to calculate the moving distance between the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree; moving the first image and / or the second image according to the moving distance with the aim of making the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree coincide; determining the change situation of the crack according to the crack on the moved first image and the crack on the second image. By this method, the accuracy of crack detection of the coating layer to be measured is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery electrode sheets, and in particular, to a detection method, device, electronic device, and computer-readable storage medium. Background Art

[0002] During the preparation of battery electrode sheets, a coating layer needs to be formed by coating a slurry on an empty foil and then dried to form the battery electrode sheet. When testing the flexibility of the coating layer, it can be tested by a device including a roller member and a conveying substrate. Specifically, the coating layer can be placed on the conveying substrate. When the conveying substrate transports the coating layer into the roller member, since the roller member will deform the coating layer and cause tension in the coating layer, a cracking tendency will occur in the coating layer.

[0003] Let the coating layer be conveyed multiple rounds in the device (each round will pass through the roller member). At the same position, images of the same coating layer in adjacent two rounds are acquired, and the cracking condition of the coating layer is judged according to these two images. However, during the actual conveying process, the conveying substrate will slip to varying degrees with the roller body, resulting in an offset between the actual image acquisition area and the planned image acquisition area, leading to misjudgment. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a detection method, device, electronic device, and computer-readable storage medium to improve the accuracy of crack detection of the coating layer on the battery electrode sheet.

[0005] In a first aspect, an embodiment of the present application provides a detection method, which is applied to a host computer, and the host computer is connected to an image acquisition unit in a test device; the test device further includes a roller member and a conveying substrate; the conveying substrate is wound around the roller member to form a closed-loop circuit; a to-be-tested coating layer is provided on the conveying substrate, and the image acquisition unit is used to sequentially acquire images of the to-be-tested coating layer at the same detection position on the conveying substrate in the nth round and the (n + 1)th round, respectively obtaining a first image and a second image; the method includes:

[0006] Fit a plurality of first crack line segments on the to-be-tested coating layer in the first image, and a plurality of second crack line segments on the to-be-tested coating layer in the second image;

[0007] Calculate the coincidence degree between the first crack line segment and the second crack line segment;

[0008] Select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distance of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree;

[0009] For the purpose of overlapping the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap, move the first image and / or the second image according to the moving distance;

[0010] Determine the change of the crack according to the crack on the moved first image and the crack on the second image.

[0011] Combined with the first aspect, the embodiment of the present application provides a first possible implementation manner of the first aspect, wherein the first image is an image corresponding to a specified area in the image obtained by the imaging unit when imaging the to-be-detected coating layer in the nth round; the second image is an image corresponding to the specified area in the image obtained by the imaging unit when imaging the to-be-detected coating layer in the (n + 1)th round.

[0012] Combined with the first aspect, the embodiment of the present application provides a second possible implementation manner of the first aspect, wherein before calculating the degree of overlap between the first crack line segment and the second crack line segment, it further includes:

[0013] Calculate the first lateral edge distance of the to-be-detected coating layer in the first image and the second lateral edge distance of the to-be-detected coating layer in the second image; the lateral direction is the direction perpendicular to the running direction of the conveyor substrate;

[0014] When the first lateral edge distance and the second lateral edge distance are different, move the first image and / or the second image in the lateral direction according to the difference between the first lateral edge distance and the second lateral edge distance, so that the to-be-detected coating layers in the first image and the second image are aligned along the edge in the longitudinal direction; the longitudinal direction is the running direction of the conveyor substrate.

[0015] Combined with the second possible implementation manner of the first aspect, the embodiment of the present application provides a third possible implementation manner of the first aspect, wherein the step of selecting the maximum degree of overlap from each of the degrees of overlap to calculate the moving distance of the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap includes:

[0016] Select the maximum degree of overlap from each of the degrees of overlap to calculate the moving distance of the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap in the longitudinal direction;

[0017] The step of moving the first image and / or the second image according to the moving distance for the purpose of overlapping the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap includes:

[0018] With the purpose of aligning the first crack line segment and the second crack line segment corresponding to the maximum overlap, the first image and / or the second image are moved in the longitudinal direction according to the movement distance.

[0019] In combination with the third possible implementation of the first aspect, the embodiment of the present application provides a fourth possible implementation of the first aspect, wherein the selecting the maximum overlap from the respective overlaps to calculate the movement distances of the first crack segment and the second crack segment corresponding to the maximum overlap includes:

[0020] Selecting the maximum degree of overlap from among the degrees of overlap;

[0021] When the maximum overlap meets a preset requirement, calculating the longitudinal movement distances of the first crack line segment and the second crack line segment corresponding to the maximum overlap;

[0022] When the maximum overlap does not meet the preset requirements, multiple groups of points in the same longitudinal direction are selected on the first crack line segment and the second crack line segment corresponding to the maximum overlap, so as to determine the moving distance according to the point distances of each group of points.

[0023] In combination with the first aspect, an embodiment of the present application provides a fifth possible implementation of the first aspect, wherein determining a change in the crack based on the crack in the first image and the crack in the second image after the movement includes:

[0024] According to the cracks on the first image and the cracks on the second image after the movement, a difference between the crack area in the first image and the crack area in the second image is calculated to obtain a newly added crack area.

[0025] In combination with the first aspect, the embodiment of the present application provides a sixth possible implementation of the first aspect, wherein the imaging unit is used to capture an image of the coating layer to be tested when it passes through the roller during each round of transportation; the imaging unit has a fixed imaging area on the roller;

[0026] The imaging time interval of the imaging unit is the time for the conveying substrate to run one circle under ideal conditions, or the time corresponding to the roller rotating a preset number of times; when the roller rotates a preset number of times, the conveying substrate runs one circle under ideal conditions.

[0027] Second aspect, embodiments of the present application further provide a detection device, which is applied to a host computer, and the host computer is connected to an imaging unit in a test device; the test device further includes a roller member and a conveying substrate; the conveying substrate is wound around the roller member to form a closed loop; a to-be-detected coating layer is provided on the conveying substrate, and the imaging unit is configured to sequentially acquire images of the to-be-detected coating layer at the same detection position on the conveying substrate in the nth round and the (n + 1)th round, respectively obtaining a first image and a second image; the device includes:

[0028] A fitting module, configured to fit a plurality of first crack line segments on the to-be-detected coating layer in the first image, and a plurality of second crack line segments on the to-be-detected coating layer in the second image;

[0029] A first calculation module, configured to calculate the coincidence degree between the first crack line segment and the second crack line segment;

[0030] A selection module, configured to select the maximum coincidence degree from each of the coincidence degrees, so as to calculate the moving distances of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree;

[0031] A first moving module, configured to move the first image and / or the second image according to the moving distance for the purpose of making the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree coincide;

[0032] A determination module, configured to determine the change condition of the crack according to the crack on the moved first image and the crack on the second image.

[0033] Combined with the second aspect, embodiments of the present application provide a first possible implementation manner of the second aspect, wherein the first image is an image corresponding to a specified area in the image obtained by the imaging unit when imaging the to-be-detected coating layer in the nth round; the second image is an image corresponding to the specified area in the image obtained by the imaging unit when imaging the to-be-detected coating layer in the (n + 1)th round.

[0034] Combined with the second aspect, embodiments of the present application provide a second possible implementation manner of the second aspect, wherein it further includes:

[0035] A second calculation module, configured to calculate a first lateral edge distance of the to-be-detected coating layer in the first image and a second lateral edge distance of the to-be-detected coating layer in the second image before the first calculation module calculates the coincidence degree between the first crack line segment and the second crack line segment; the lateral direction is the direction perpendicular to the running direction of the conveying substrate;

[0036] A second moving module, configured to, when the first lateral edge distance and the second lateral edge distance are different, move the first image and / or the second image horizontally according to the difference between the first lateral edge distance and the second lateral edge distance, so that the to-be-detected coating layers in the first image and the second image are aligned along the edges in the vertical direction; the vertical direction is the running direction of the conveyor substrate.

[0037] Combined with the second possible implementation manner of the second aspect, the embodiments of the present application provide a third possible implementation manner of the second aspect. When the selection module is configured to select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum coincidence degree, it is specifically configured to:

[0038] Select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum coincidence degree in the vertical direction;

[0039] When the first moving module is configured to move the first image and / or the second image according to the moving distance with the aim of overlapping the first crack segment and the second crack segment corresponding to the maximum coincidence degree, it is specifically configured to:

[0040] With the aim of overlapping the first crack segment and the second crack segment corresponding to the maximum coincidence degree, move the first image and / or the second image in the vertical direction according to the moving distance.

[0041] Combined with the third possible implementation manner of the second aspect, the embodiments of the present application provide a fourth possible implementation manner of the second aspect. When the selection module is configured to select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum coincidence degree in the vertical direction, it is specifically configured to:

[0042] Select the maximum coincidence degree from each of the coincidence degrees;

[0043] When the maximum coincidence degree meets the preset requirements, calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum coincidence degree in the vertical direction;

[0044] When the maximum coincidence degree does not meet the preset requirements, select multiple groups of points at the same vertical positions on the first crack segment and the second crack segment corresponding to the maximum coincidence degree, so as to determine the moving distance according to the point distances of each group of points.

[0045] In combination with the second aspect, an embodiment of the present application provides a fifth possible implementation manner of the second aspect. When the determining module is used to determine the change situation of the crack according to the crack on the moved first image and the crack on the second image, it is specifically used for:

[0046] Calculate the difference between the crack area in the first image and the crack area in the second image according to the crack on the moved first image and the crack on the second image to obtain the newly added crack area.

[0047] In combination with the second aspect, an embodiment of the present application provides a sixth possible implementation manner of the second aspect. The imaging unit is used to obtain an image of the to-be-detected coating layer when it passes through the roller during each round of transportation; the imaging area of the imaging unit on the roller is fixed;

[0048] The imaging time interval of the imaging unit is the time for the conveying substrate to run one week under ideal conditions, or the time corresponding to the roller rotating a preset number of turns; when the roller rotates a preset number of turns, the conveying substrate runs one week under ideal conditions.

[0049] In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the memory through the bus. When the machine-readable instructions are executed by the processor, the steps in any one of the possible implementation manners in the first aspect described above are executed.

[0050] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by a processor, the steps in any one of the possible implementation manners in the first aspect described above are executed.

[0051] A detection method, device, electronic device, and computer-readable storage medium provided by an embodiment of the present application, after obtaining a first image and a second image, fit a first crack line segment on the to-be-detected coating layer in the first image and a second crack line segment on the to-be-detected coating layer in the second image, and then calculate the moving distance between the first image and the second image according to the coincidence degree of the first crack line segment and the second crack line segment. Move the first image and / or the second image according to the moving distance to make the first crack line segment in the first image coincide with the second crack line segment in the second image, and then perform crack analysis, avoiding the problem that the two imaging areas of the imaging unit for the to-be-detected coating layer are different due to different degrees of slippage between the conveying substrate and the roller body, resulting in inaccurate crack analysis on the to-be-detected coating layer, which is beneficial to improving the accuracy of crack detection of the to-be-detected coating layer on the battery electrode sheet.

[0052] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0054] Figure 1 Shows a schematic structural diagram of a test device provided by an embodiment of the present application;

[0055] Figure 2 Shows a flowchart of a detection method provided by an embodiment of the present application;

[0056] Figure 3 Shows a schematic structural diagram of a battery electrode passing through a second roller member provided by an embodiment of the present application;

[0057] Figure 4 Shows a schematic diagram of the first crack line segment in the first image provided by an embodiment of the present application;

[0058] Figure 5 Shows a schematic diagram of the second image provided by an embodiment of the present application;

[0059] Figure 6 Shows a single-disc powder dropping trend graph provided by an embodiment of the present application;

[0060] Figure 7 Shows a total powder dropping trend graph provided by an embodiment of the present application;

[0061] Figure 8 Shows a schematic diagram of the first lateral edge distance provided by an embodiment of the present application;

[0062] Figure 9 Shows a schematic diagram of the point distance provided by an embodiment of the present application;

[0063] Figure 10 Shows a schematic structural diagram of a detection device provided by an embodiment of the present application;

[0064] Figure 11 Shows a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0066] During the preparation of the battery electrode sheet, it is necessary to coat a slurry on the empty foil to form a coating layer, and then dry it to form the battery electrode sheet. When testing the flexibility of the coating layer to be measured on the battery electrode sheet, it can be tested by a testing device including a roller member and a transfer substrate. Specifically, Figure 1 shows a schematic structural diagram of a testing device provided by an embodiment of the present application, as Figure 1 shown, the testing device specifically includes a transfer substrate 1, a first roller member 2, a second roller member 3, a floating roller 4, a slider 5, a slide rail 6, and an imaging unit 7. Among them, the transfer substrate 1 is sequentially wound around the first roller member 2, the second roller member 3, and the floating roller 4 to form a closed-loop circuit. The transfer substrate 1 is used to transfer the coating layer 8 to be measured. The floating roller 4 is slidably connected to the slide rail 6 through the slider 5. The floating roller 4 itself has a weight and can provide tension to the transfer substrate 1 to keep the transfer substrate 1 in a tense state, avoiding slippage between the transfer substrate 1 and the roller member and thus affecting the accuracy of the test.

[0067] Due to the setting of the floating roller, the floating roller will move on the slide rail during the operation of the transfer substrate. Specifically, when the coating layer to be measured is transferred between the first roller member and the second roller member, the coating layer to be measured will indirectly generate an upward pulling force on the position of the transfer substrate where the floating roller is located; and when the coating layer to be measured is transported to the position of the floating roller, the coating layer to be measured will generate a downward pulling force on the position of the transfer substrate where the floating roller is located. At this time, the setting of the floating roller will exacerbate the slippage phenomenon between the transfer substrate and the first roller member or the second roller member.

[0068] Considering the slippage phenomenon between the transfer substrate and the roller member, which results in an offset between the actual imaging area and the planned imaging area to be photographed, leading to misjudgment. Based on this, the embodiments of the present application provide a detection method, device, electronic device, and computer-readable storage medium to improve the accuracy of crack detection of the coating layer to be measured on the battery electrode sheet, which will be described below through embodiments.

[0069] Embodiment 1:

[0070] For the convenience of understanding this embodiment, first, a detection method disclosed in the embodiments of the present application will be introduced in detail. This method is applied to the host computer, and the host computer is connected to the imaging unit in the test device; the test device further includes a roller member and a conveying substrate; the conveying substrate is wound around the roller member to form a closed loop; a to-be-detected coating layer is provided on the conveying substrate, and the imaging unit is used to sequentially obtain images of the to-be-detected coating layer at the same detection position on the conveying substrate in the nth round and the (n + 1)th round, respectively obtaining a first image and a second image; Figure 2 The flowchart of a detection method provided by the embodiments of the present application is shown in Figure 2 as follows, including the following steps:

[0071] S101: Fit a number of first crack line segments on the to-be-detected coating layer in the first image, and a number of second crack line segments on the to-be-detected coating layer in the second image.

[0072] In this embodiment, as shown in Figure 1 the test device includes a roller member, a conveying substrate and an imaging unit. The roller member specifically includes a first roller member, a second roller member and a floating roller. The test device also includes a slider and a slide rail that match the floating rail. The roller diameters of the first roller member, the second roller member and the floating roller may be the same or different. In each round of transportation of the conveying substrate driving the to-be-detected coating layer, it needs to pass through the first roller member, the second roller member and the floating roller in sequence. In this embodiment, by setting the floating roller, it is convenient to replace the first roller member, the second roller member and the floating roller with different roller diameters.

[0073] Here, the conveying substrate may be the foil material itself (a coating layer is formed on the foil material by coating slurry, and then dried to form a battery electrode sheet), and the to-be-detected coating layer may be a certain area to be inspected of the coating layer on the foil material. The conveying substrate may also be a conveyor belt, and the to-be-detected coating layer may be all the coating layers on the entire electrode sheet placed on the conveyor belt, or may be a part of the coating layer.

[0074] Figure 3 The schematic structural diagram of the to-be-detected coating layer passing through the second roller member provided by the embodiments of the present application is shown in Figure 3 as follows. When the to-be-detected coating layer is transported to the position of the roller member, the to-be-detected coating layer will deform according to the roller diameter of the roller member. At this time, there is a possibility of cracking of the to-be-detected coating layer.

[0075] In a possible implementation manner, the imaging unit is used to obtain images of the to-be-detected coating layer when passing through the roller member in each round of transportation; the imaging area of the imaging unit on the roller member is fixed; the imaging time interval of the imaging unit is the time for the conveying substrate to run one week under ideal conditions, or the time corresponding to the roller member rotating a preset number of turns; when the roller member rotates a preset number of turns, the conveying substrate runs one week under ideal conditions.

[0076] In this embodiment, the position of the imaging unit relative to the roller is fixed. Therefore, the imaging area of the imaging unit on the roller is fixed. As Figure 3 shown, the imaging unit is used to obtain an image of the coating to be measured when it passes through a specified roller (such as the second roller) during each round of transportation.

[0077] When the coating to be measured passes through the roller, the cracks on the coating to be measured are more obvious. Therefore, by setting the imaging unit near the roller and obtaining an image of the coating to be measured when it passes through the roller, it is beneficial to more accurately fit the crack segments on the coating to be measured. And by setting the imaging time interval, when there is no slipping between the conveying substrate and the roller in the images obtained by the imaging unit in each round, the position of the coating to be measured in the image obtained in each round is the same.

[0078] In this embodiment, after the imaging unit obtains an image containing the coating to be measured during each round of transportation, the obtained image is sent to the host computer in real time.

[0079] In a possible implementation manner, the first image is an image corresponding to a specified area in the image obtained by the imaging unit when imaging the coating to be measured in the nth round; the second image is an image corresponding to the specified area in the image obtained by the imaging unit when imaging the coating to be measured in the (n + 1)th round.

[0080] In this embodiment, the specified area is a preset fixed position in the image obtained by the imaging unit when imaging the coating to be measured (i.e., the imaging image). For example, the specified area can be an area formed by a preset width and length with the center point of the imaging image as the specified center point. The position of the first image in the first imaging image is the same as the position of the second image in the second imaging image. However, since the position of the coating to be measured in the first imaging image is different from its position in the second imaging image, the coating to be measured included in the first image may not be exactly the same as the coating to be measured included in the second image.

[0081] In this embodiment, by only fitting the first crack segment in the first image and the second crack segment in the second image, without fitting all the first crack segments in the first imaging image and all the second crack segments in the second imaging image, it is beneficial to reduce the data calculation amount and improve the fitting speed.

[0082] In another possible implementation manner, the first image is the image obtained by the imaging unit when imaging the coating to be measured in the nth round, and the second image is the image obtained by the imaging unit when imaging the coating to be measured in the (n + 1)th round.

[0083] In a possible implementation manner, Figure 4Shows a schematic diagram of the first crack segment in the first image provided by the embodiments of the present application. As Figure 4 shown, when performing step S101 to fit several first crack segments on the to-be-detected coating layer in the first image, specifically, it can be: intercept a first rectangular area with the length direction extending longitudinally from the first image, determine the first intersection points between the edges of the first rectangular area and the cracks in the first image, use two first intersection points on the same crack in the first image as the endpoints of the first crack segment, and then determine the first crack segment.

[0084] There can be one or multiple first rectangular areas. As Figure 4 shown, when there are two first matrix areas, four first crack segments a1, b1, c1, and d1 are obtained.

[0085] When performing step S101 to fit several second crack segments on the to-be-detected coating layer in the second image, specifically, it can be: determine the second matrix area in the second image according to the position of the first rectangular area in the first image; wherein, the position of the first rectangular area in the first image is the same as the position of the second matrix area in the second image; determine the second intersection points between the edges of the second matrix area and the cracks in the second image, use two second intersection points on the same crack in the second image as the endpoints of the second crack segment, and then determine the second crack segment.

[0086] S102: Calculate the coincidence degree between the first crack segment and the second crack segment.

[0087] In this embodiment, there may be multiple cracks on the to-be-detected coating layer. Since the first image and the second image are obtained by imaging the battery electrode sheet during different rounds of transportation, the number of cracks on the battery electrode sheet in the first image and the second image may be different. When the imaging time of the first image is earlier than that of the second image, the number of cracks on the second image may be more than that in the first image.

[0088] After slipping occurs between the conveying substrate and the roller, the position of the to-be-detected coating layer in the first image is different from its position in the second image, which also makes the position of the first crack segment corresponding to the same crack in the first image different from the position of the second crack segment corresponding to this crack in the second image.

[0089] In this embodiment, for each first crack segment, calculate the coincidence degree between this first crack segment and each second crack segment to obtain the coincidence degree between each first crack segment and each second crack segment.

[0090] S103: Select the maximum coincidence degree from each coincidence degree to calculate the moving distance of the first crack segment and the second crack segment corresponding to this maximum coincidence degree.

[0091] For example, Figure 4 As shown, the first image includes multiple first crack line segments, and four of the first crack line segments a1, b1, c1, and d1 are taken as an example for description. Figure 5 A schematic diagram of the second image provided in the embodiment of the present application is shown in FIG. Figure 5 As shown, the second image includes multiple second crack line segments, and four of the second crack line segments a2, b2, c2, and d2 are taken as an example for description.

[0092] Assume that the overlap between the first crack line segment a1 and the second crack line segment a2 is 100%, the overlap between the first crack line segment b1 and the second crack line segment b2 is 100%, the overlap between the first crack line segment c1 and the second crack line segment c2 is 60%, and the overlap between the first crack line segment d1 and the second crack line segment d2 is 0%.

[0093] Then, the moving distance between the first crack segment and the second crack segment corresponding to the coincidence degree of 100% is calculated. Specifically, the moving distance between the first crack segment a1 and the second crack segment a2 can be calculated, and the moving distance between the first crack segment b1 and the second crack segment b2 can also be calculated.

[0094] S104: Moving the first image and / or the second image according to the moving distance for the purpose of aligning the first crack line segment and the second crack line segment corresponding to the maximum overlap.

[0095] In this embodiment, the first image and / or the second image is moved according to the moving distance to overlap the first crack line segment a1 in the first image and the second crack line segment a2 in the second image, and to overlap the first crack line segment b1 in the first image and the second crack line segment b2 in the second image. Then, the coating layer to be tested in the first image and the coating layer to be tested in the second image overlap.

[0096] S105: Determine a change in the crack according to the crack on the first image and the crack on the second image after the movement.

[0097] After the coating layer to be tested in the first image and the coating layer to be tested in the second image are overlapped, the change of the crack is determined according to the crack in the overlapped first image and the crack in the second image.

[0098] In this embodiment, the powder loss trend can be analyzed according to the change of cracks. Figure 6 The following shows the powder loss trend diagram provided by the embodiment of the present application. Figure 6As shown, if the powder loss of the coating layer to be measured is small in the early rounds and large in the later rounds, for example, the trend graph of the powder loss per round \(m\) and the transport round \(n\) is as follows. It can be seen that after the \(n = n1\) round, the powder loss per round increases significantly. Then, during the transmission process, avoid the number of times the coating layer to be measured bypasses the roller after drying being greater than \(n1\) times.

[0099] Or, Figure 7 The total powder loss trend graph provided by the embodiment of the present application is shown. As Figure 7 shown, obtain the trend graph of the total powder loss \(m'\) and the transport round \(n\). If the production requirement is that the total powder loss cannot exceed the \(m1\) value, then during the transmission process, avoid the number of times the electrode sheet bypasses the roller after drying being greater than \(n2\) times.

[0100] Or, when preparing a cylindrical battery by winding, based on the principle that the smaller the roller diameter, the greater the powder loss trend, obtain the comparison between different roller diameters and powder loss. When the roller diameter is \(a\) and the powder loss after bypassing the set number of turns is \(b\), and the production requirement is that the powder loss after bypassing the set number of turns cannot be greater than \(b\), then the diameter of the middle winding core of the cylindrical battery cannot be less than \(a\).

[0101] In a possible implementation manner, during the transportation of the coating layer to be measured on the transfer substrate, the coating layer to be measured is fixed on the transfer substrate (for example, sticking the battery electrode sheet containing the coating layer to be measured to the conveyor belt, or directly coating the coating layer to be measured on an empty platinum). Therefore, generally, there is no displacement between the coating layer to be measured and the transfer substrate. However, when an unexpected situation occurs, resulting in the coating layer to be measured moving in the lateral direction of the transfer substrate, or the transfer substrate and the roller moving in the lateral direction, the lateral offset can be compensated by the following method. Specifically, before performing step S102, it can also be executed according to the following steps:

[0102] S1021: Calculate the first lateral edge distance of the coating layer to be measured in the first image and the second lateral edge distance of the coating layer to be measured in the second image; the lateral direction is the vertical direction of the running direction of the transfer substrate;

[0103] S1022: When the first lateral edge distance and the second lateral edge distance are different, move the first image and / or the second image in the lateral direction according to the difference between the first lateral edge distance and the second lateral edge distance, so that the coating layer to be measured in the first image and the coating layer to be measured in the second image are aligned along the edges in the longitudinal direction.

[0104] Taking the first lateral edge distance as an example for illustration, Figure 8 The schematic diagram of the first lateral edge distance provided by the embodiment of the present application is shown. As Figure 8As shown, the first lateral edge distance can be the distance between the longitudinal edge of the coating layer 8 to be measured and the longitudinal edge of the first image 9. There are two first lateral edge distances corresponding to the first image 9, that is, the distance between the longitudinal left edge of the coating layer 8 to be measured and the longitudinal left edge of the first image 9 (referred to as the first lateral left edge distance), and the distance between the longitudinal right edge of the coating layer 8 to be measured and the longitudinal right edge of the first image 9 (referred to as the first lateral right edge distance). In this embodiment, the second lateral edge distance can refer to the description of the edge distance of the first image 9.

[0105] When comparing whether the first lateral edge distance and the second lateral edge distance are the same, specifically, it can be compared whether the first lateral left edge distance and the second lateral left edge distance are the same, or whether the first lateral right edge distance and the second lateral right edge distance are the same.

[0106] When the first lateral edge distance and the second lateral edge distance are the same, it means that the coating layer to be measured has not moved in the lateral direction of the conveying substrate, and there is no displacement between the conveying substrate and the roller in the lateral direction. That is to say, at this time, the coating layers to be measured in the first image and the second image are aligned along the edges longitudinally, and there is no need to move the first image and / or the second image in the lateral direction.

[0107] When the first lateral edge distance and the second lateral edge distance are not the same, it means that the coating layer to be measured has moved in the lateral direction of the conveying substrate, or there is a displacement between the conveying substrate and the roller in the lateral direction. At this time, it is necessary to move the first image and / or the second image in the lateral direction according to the difference between the first lateral edge distance and the second lateral edge distance, so that the coating layers to be measured in the first image and the second image are aligned along the edges longitudinally.

[0108] In this embodiment, the longitudinal direction is the running direction of the conveying substrate, and the lateral direction is perpendicular to this running direction.

[0109] In a possible implementation manner, when performing step S103, specifically, the maximum coincidence degree can be selected from each of the coincidence degrees to calculate the moving distance in the longitudinal direction of the first crack line segment and the second crack line segment corresponding to this maximum coincidence degree.

[0110] In a possible implementation manner, when performing the step of selecting the maximum coincidence degree from each of the coincidence degrees to calculate the moving distance in the longitudinal direction of the first crack line segment and the second crack line segment corresponding to this maximum coincidence degree, it can be specifically performed according to the following steps S1031 - S1033:

[0111] S1031: Select the maximum coincidence degree from each of the coincidence degrees;

[0112] S1032: When the maximum degree of overlap meets the preset requirement, calculate the moving distances of the first crack segment and the second crack segment corresponding to this maximum degree of overlap in the longitudinal direction;

[0113] S1033: When the maximum degree of overlap does not meet the preset requirement, select multiple groups of points at the same longitudinal positions on the first crack segment and the second crack segment corresponding to this maximum degree of overlap, so as to determine the moving distance according to the point distances of each group of points.

[0114] In this embodiment, the preset requirement can be that the degree of overlap is 100%, or the degree of overlap is greater than the preset degree of overlap. Exemplarily, the preset degree of overlap can be 90%.

[0115] When the preset requirement is that the degree of overlap is 100%, when the maximum degree of overlap is 100%, directly calculate the moving distances of the first crack segment and the second crack segment corresponding to this maximum degree of overlap in the longitudinal direction.

[0116] When the maximum degree of overlap is less than 100%, that is, when the preset requirement is not met, Figure 9 shows a schematic diagram of the point distance provided by the embodiment of the present application, as Figure 9 shown. Assuming that the degree of overlap of 60% between the first crack segment f1 and the second crack segment f2 is the maximum degree of overlap, then, select multiple (for example, 5) first points on the first crack segment f1 ( Figure 9 the black dots on f1 in Figure 9 ), and determine the second points on the second crack segment f2 that are at the same longitudinal positions as each first point (

[0117] the black dots on f2 in

[0118] ), calculate the point distances between each group of first points and second points respectively: e1, e2, e3, e4, e5, then calculate the mean value of the point distances corresponding to each group of points (that is, the mean value of e1, e2, e3, e4, e5), and use this mean value as the moving distance.

[0119] In the execution of step S104, specifically, it is possible to: with the aim of making the first crack segment and the second crack segment corresponding to the maximum degree of overlap coincide, move the first image and / or the second image in the longitudinal direction according to the moving distance.

[0120] If the flexibility is poor, during the subsequent process of manufacturing the coating layer, the temperature of the oven can be reduced, or the transfer speed of the battery electrode sheet / coating layer in the oven can be increased to increase the moisture content in the coating layer.

[0121] In a possible implementation manner, when performing step S102, when the edges of the cracks on the coating layer to be measured all change, resulting in no overlapping first crack segment and second crack segment, it may be that the flexibility of the coating layer to be measured is too poor, causing large-scale peeling of the coating layer. At this time, directly calculate and compare the crack area in the first image and the crack area in the second image. If the difference in the crack areas is greater than the preset limit difference, the coating layer to be measured is determined to be unqualified. If the difference in the crack areas is not greater than the preset limit difference, it indicates an extreme situation where the edges of the cracks just slightly change. The detection can be paused, the coating layer to be measured can be marked and removed, or the coating layer to be measured can be retested through other detection methods later.

[0122] The present application also provides a coating machine. After the coating layer to be measured enters the oven and dries for a certain distance, the coating layer to be measured moves backward and returns between the pushing rollers. The pushing rollers push the coating layer to be measured onto the transfer substrate. There is adhesiveness at the contact position between the surface of the transfer substrate and the coating layer to be measured, so that the coating layer to be measured adheres to the transfer substrate.

[0123] Example Two:

[0124] Figure 10 The structural schematic diagram of a detection device provided by an embodiment of the present application is shown. The device is applied to a host computer, and the host computer is connected to an imaging unit in the testing equipment; the testing equipment further includes roller members and a transfer substrate; the transfer substrate is wound around the roller members to form a closed-loop circuit; a coating layer to be measured is provided on the transfer substrate, and the imaging unit is used to sequentially acquire images of the coating layer to be measured at the same detection position on the transfer substrate in the nth round and the (n + 1)th round, respectively obtaining a first image and a second image; as Figure 10 shown, the device includes:

[0125] A fitting module 1001, configured to fit a plurality of first crack segments on the coating layer to be measured in the first image, and a plurality of second crack segments on the coating layer to be measured in the second image;

[0126] A first calculation module 1002, configured to calculate the overlapping degree of the first crack segment and the second crack segment;

[0127] A selection module 1003, configured to select the maximum overlapping degree from each of the overlapping degrees to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum overlapping degree;

[0128] The first moving module 1004 is configured to move the first image and / or the second image according to the moving distance for the purpose of overlapping the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree.

[0129] The determination module 1005 is configured to determine the change condition of the crack according to the cracks on the first image and the second image after movement.

[0130] Optionally, the first image is an image corresponding to a specified area in the image obtained by the imaging unit when imaging the to-be-tested coating layer in the nth round; the second image is an image corresponding to the specified area in the image obtained by the imaging unit when imaging the to-be-tested coating layer in the (n + 1)th round.

[0131] Optionally, it further includes:

[0132] The second calculation module is configured to calculate the first lateral edge distance of the to-be-tested coating layer in the first image and the second lateral edge distance of the to-be-tested coating layer in the second image before the first calculation module 1002 calculates the coincidence degree between the first crack line segment and the second crack line segment; the lateral direction is the direction perpendicular to the running direction of the conveying substrate.

[0133] The second moving module is configured to, when the first lateral edge distance and the second lateral edge distance are different, move the first image and / or the second image in the lateral direction according to the difference between the first lateral edge distance and the second lateral edge distance, so that the to-be-tested coating layers in the first image and the second image are aligned along the edges in the longitudinal direction; the longitudinal direction is the running direction of the conveying substrate.

[0134] Optionally, when the selection module 1003 is configured to select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distance of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree, it is specifically configured to:

[0135] Select the maximum coincidence degree from each of the coincidence degrees to calculate the moving distance of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree in the longitudinal direction;

[0136] When the first moving module 1004 is configured to move the first image and / or the second image according to the moving distance for the purpose of overlapping the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree, it is specifically configured to:

[0137] For the purpose of overlapping the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap, move the first image and / or the second image longitudinally by the moving distance.

[0138] Optionally, when the selection module 1003 is used to select the maximum degree of overlap from each degree of overlap to calculate the moving distance in the longitudinal direction of the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap, it is specifically used for:

[0139] Select the maximum degree of overlap from each degree of overlap;

[0140] When the maximum degree of overlap meets the preset requirements, calculate the moving distance in the longitudinal direction of the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap;

[0141] When the maximum degree of overlap does not meet the preset requirements, select multiple groups of points at the same longitudinal positions on the first crack line segment and the second crack line segment corresponding to the maximum degree of overlap, and determine the moving distance according to the point distances of each group of points.

[0142] Optionally, when the determination module 1005 is used to determine the change situation of the crack according to the cracks on the overlapped first image and the second image, it is specifically used for:

[0143] Calculate the difference between the crack area in the first image and the crack area in the second image according to the cracks on the moved first image and the second image to obtain the new crack area.

[0144] Optionally, the image acquisition unit is used to acquire images of the to-be-tested coating layer when it passes through the roller during each round of transportation; the image acquisition area of the image acquisition unit on the roller is fixed;

[0145] The image acquisition time interval of the image acquisition unit is the time for the conveyor substrate to run one week under ideal conditions, or the time corresponding to the roller rotating a preset number of turns; when the roller rotates a preset number of turns, the conveyor substrate runs one week under ideal conditions.

[0146] Embodiment 3:

[0147] Figure 11A schematic structural diagram of an electronic device provided by an embodiment of the present application, including: a processor 1101, a memory 1102, and a bus 1103. The memory 1102 stores machine-readable instructions executable by the processor 1101. When the electronic device runs the above information processing method, the processor 1101 communicates with the memory 1102 through the bus 1103, and the processor 1101 executes the machine-readable instructions to execute the method steps described in Embodiment 1.

[0148] Embodiment 4:

[0149] Embodiment 4 of the present application also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, it executes the method steps described in Embodiment 1.

[0150] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described device, electronic device, and computer-readable storage medium can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0151] In several embodiments provided by the present application, it should be understood that the disclosed device and method can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical, or other form.

[0152] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] In addition, each functional unit in various embodiments of the present application can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0154] When the above-mentioned functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs.

[0155] Finally, it should be noted that the above-mentioned embodiments are only specific implementation manners of the present application, used to illustrate the technical solutions of the present application, rather than limiting them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed in the present application can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A detection method, characterized in that, The method is applied to a host computer, which is connected to an imaging unit in a test device; the test device further includes a roller member and a conveying substrate; the conveying substrate is wound around the roller member to form a closed loop; a coating layer to be tested is provided on the conveying substrate, and the imaging unit is used to sequentially obtain images of the coating layer to be tested at the same detection position on the conveying substrate in the n-th round and the (n + 1)-th round, respectively obtaining a first image and a second image; the method includes: Fitting a plurality of first crack line segments on the coating layer to be tested in the first image, and a plurality of second crack line segments on the coating layer to be tested in the second image; Calculating the coincidence degree between the first crack line segment and the second crack line segment; Selecting the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree; For the purpose of making the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree coincide, moving the first image and / or the second image according to the moving distance; Determining the change condition of the crack according to the crack on the moved first image and the crack on the second image.

2. The method according to claim 1, wherein The first image is an image corresponding to a specified area in the image obtained by the imaging unit taking an image of the coating layer to be tested in the n-th round; the second image is an image corresponding to the specified area in the image obtained by the imaging unit taking an image of the coating layer to be tested in the (n + 1)-th round.

3. The method according to claim 1, wherein Before calculating the coincidence degree between the first crack line segment and the second crack line segment, it further includes: Calculating a first lateral edge distance of the coating layer to be tested in the first image, and a second lateral edge distance of the coating layer to be tested in the second image; the lateral direction is the direction perpendicular to the running direction of the conveying substrate; When the first lateral edge distance and the second lateral edge distance are different, moving the first image and / or the second image in the lateral direction according to the difference between the first lateral edge distance and the second lateral edge distance, so that the coating layer to be tested in the first image and the coating layer to be tested in the second image are aligned along the edges in the longitudinal direction; the longitudinal direction is the running direction of the conveying substrate.

4. The method according to claim 3, wherein The step of selecting the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree includes: Selecting the maximum coincidence degree from each of the coincidence degrees to calculate the moving distances of the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree in the longitudinal direction; The step of moving the first image and / or the second image according to the moving distance for the purpose of making the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree coincide includes: For the purpose of making the first crack line segment and the second crack line segment corresponding to the maximum coincidence degree coincide, moving the first image and / or the second image in the longitudinal direction according to the moving distance.

5. The method according to claim 4, wherein Selecting the maximum degree of coincidence from each of the degrees of coincidence to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum degree of coincidence in the longitudinal direction includes: Selecting the maximum degree of coincidence from each of the degrees of coincidence; When the maximum degree of coincidence meets the preset requirements, calculating the moving distances of the first crack segment and the second crack segment corresponding to the maximum degree of coincidence in the longitudinal direction; When the maximum degree of coincidence does not meet the preset requirements, selecting multiple groups of points at the same longitudinal positions on the first crack segment and the second crack segment corresponding to the maximum degree of coincidence to determine the moving distance according to the point distances of each group of points.

6. The method according to claim 1, characterized in that Determining the change condition of the crack according to the crack on the moved first image and the crack on the second image includes: Calculating the difference between the crack area in the first image and the crack area in the second image according to the crack on the moved first image and the crack on the second image to obtain the newly added crack area.

7. The method according to claim 1, characterized in that The image acquisition unit is used to acquire the images of the to-be-tested coating layer when passing through the roller during each round of transportation; the image acquisition area of the image acquisition unit on the roller is fixed; The image acquisition time interval of the image acquisition unit is the time for the conveying substrate to run one week in an ideal state, or the time corresponding to the roller rotating a preset number of turns; when the roller rotates a preset number of turns, the conveying substrate runs one week in an ideal state.

8. A detection device, characterized in that, The device is applied to a host computer, and the host computer is connected to the image acquisition unit in the testing device; the testing device further includes a roller and a conveying substrate; the conveying substrate is wound around the roller to form a closed-loop circuit; a to-be-tested coating layer is arranged on the conveying substrate, and the image acquisition unit is used to sequentially acquire the images of the to-be-tested coating layer passing through the same detection position on the conveying substrate in the nth round and the (n + 1)th round, respectively obtaining a first image and a second image; the device includes: A fitting module, configured to fit a plurality of first crack segments on the to-be-tested coating layer in the first image and a plurality of second crack segments on the to-be-tested coating layer in the second image; A first calculation module, configured to calculate the degree of coincidence between the first crack segment and the second crack segment; A selection module, configured to select the maximum degree of coincidence from each of the degrees of coincidence to calculate the moving distances of the first crack segment and the second crack segment corresponding to the maximum degree of coincidence; A first moving module, configured to move the first image and / or the second image according to the moving distance for the purpose of making the first crack segment and the second crack segment corresponding to the maximum degree of coincidence coincide; A determination module, configured to determine the change condition of the crack according to the crack on the moved first image and the crack on the second image.

9. An electronic device, characterized in that, Including: A processor, a memory and a bus, where the memory stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the memory through the bus. When the machine-readable instructions are executed by the processor, the steps of the method according to any one of claims 1 to 7 are executed.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, it executes the steps of the method according to any one of claims 1 to 7.

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