A detection device and a battery substrate detection device thereof

Abstract

The present disclosure provides a battery substrate detection device and a detection equipment, which relate to the field of solar cell manufacturing technology, wherein the battery substrate detection device includes a first image acquisition device and a processing controller; the first image acquisition device is located above a graphite boat on a solar cell coating production line so as to acquire an oblique angle image of the graphite boat page on the production line; the processing controller is used to determine the state of the battery substrate on the graphite boat page based on the image; the state of the battery substrate includes missing, fallen or hanging sheets.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell manufacturing, and in particular to a cell substrate detection device used in a solar cell coating production line. Background Art

[0002] Photovoltaic solar cells are devices that directly convert solar energy into electrical energy. They have become one of the clean energy sources that countries around the world are vigorously promoting. Solar cell coating is a relatively important process in the production and manufacturing of solar cells. Solar coating is to coat a special thin film on the surface of the solar cell substrate to improve the light absorption capacity, photoelectric conversion efficiency and corrosion resistance of photovoltaic cells.

[0003] How to improve the working efficiency of solar cell coating production line is a problem worth studying. Summary of the invention

[0004] One or more embodiments of the present specification provide a battery substrate detection device, including a first image acquisition device and a processing controller; the first image acquisition device is located above a graphite boat on a solar cell coating production line so as to acquire an oblique angle image of a page of the graphite boat on the production line; the processing controller is used to determine the state of the battery substrate on the graphite boat based on the image; the state of the battery substrate includes missing, fallen or hanging sheets.

[0005] The battery substrate detection device provided in one or more embodiments of the present specification also includes a second image acquisition device; the second image acquisition device is arranged relative to the first image acquisition device so that the angle between the main optical axes of the two image acquisition devices is from the numerical range (0, 180), thereby being able to acquire images at oblique angles on both sides of the graphite boat page.

[0006] The battery substrate detection device provided in one or more embodiments of the present specification also includes a mobile module; the first image acquisition device and the second image acquisition device are arranged on the mobile module, and the mobile module is used to drive the first image acquisition device and the second image acquisition device to move along the width direction of the graphite boat on the production line.

[0007] One or more embodiments of the present specification provide a battery substrate detection device, further comprising a first line light source and a second line light source, wherein the first line light source is used to fill in the light when the first image acquisition device acquires the image, and the second line light source is used to fill in the light when the second image acquisition device acquires the image, and the first line light source and the second line light source are also arranged on the mobile module; the first image acquisition device and the first image acquisition device are line scan cameras; the length direction of the imaging area of ​​the first image acquisition device, the length direction of the imaging area of ​​the second image acquisition device, the length direction of the first line light source, the length direction of the second line light source and the length direction of the graphite boat page are consistent.

[0008] One or more embodiments of the present specification provide a battery substrate detection device, wherein the angle between the main light plane of the first image acquisition device and the light emitting surface of the first line light source is from the numerical interval (0, 90) or from the numerical interval [5, 60] or from the numerical interval [8, 50] or from the numerical interval [10, 30]; the angle between the main light plane of the second image acquisition device and the light emitting surface of the second line light source is from the numerical interval (0, 90) or from the numerical interval [5, 60] or from the numerical interval [8, 50] or from the numerical interval [10, 30]; the light emitting surface of the first line light source intersects with the upper end surface of at least one boat page of the graphite boat on the production line, and the light emitting surface of the second line light source intersects with the upper end surface of at least one boat page of the graphite boat on the production line.

[0009] One or more embodiments of the present specification provide a battery substrate detection device, wherein the angle between the plane where the lower edge of the lens of the first image acquisition device is located and the horizontal plane is from the numerical interval [5, 70] or from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20]; the angle between the plane where the lower edge of the lens of the second image acquisition device is located and the horizontal plane is from the numerical interval [5, 70] or from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20].

[0010] One or more embodiments of the present specification provide a battery substrate detection device, wherein the processing controller is further used to determine the relative position information of the battery substrate on the graphite boat page and the boat page based on the image, and determine the state of the battery substrate at the boat page of the graphite boat based on the relative position information; the relative position information includes one or more of the following information: the distance from at least one point on the upper edge of the battery substrate to the upper edge of the boat page where the battery substrate is located, the angle between the upper edge of the battery substrate and the upper edge of the boat page where the battery substrate is located, and the size of the gap between the battery substrate and the boat page where the battery substrate is located.

[0011] One or more embodiments of the present specification provide a detection device for a solar cell coating production line, including a cell substrate detection device and a processing control device; the cell substrate detection device is used to detect the state of the cell substrate at the boat page of the graphite boat after the insertion process; the processing control device is used to determine whether it is necessary to issue a reminder based on the cell substrate state so that the staff can perform manual intervention; the manual intervention includes one or more of the following: replacing the graphite boat, manually adding the cell substrate to the relevant boat page of the graphite boat, and manually adjusting the cell substrate to the card point on the boat page of the graphite boat.

[0012] One or more embodiments of the present specification provide a detection device, wherein the battery substrate detection device is used to: obtain an oblique angle image of the graphite boat page on the production line; determine the relative position information between the battery substrate and the graphite boat page based on the image; determine the state of the battery substrate at the graphite boat page based on the relative position information; the battery substrate state includes missing, fallen or hanging substrate.

[0013] One or more embodiments of the present specification provide a detection device, wherein the battery substrate detection device is the aforementioned battery substrate detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] This specification will be further described in the form of exemplary embodiments, which will be described in detail by means of the accompanying drawings. The same numbers in the accompanying drawings represent the same structures or steps, wherein:

[0015] Figure 1 is a schematic diagram of a solar cell coating production line according to some embodiments of this specification;

[0016] Figure 2 is a schematic diagram of a graphite boat according to some embodiments of the present specification;

[0017] Figure 3 is a front view of a battery substrate detection device according to some embodiments of this specification;

[0018] Figure 4 is a schematic diagram of a battery substrate detection device installed on a production line according to some embodiments of this specification;

[0019] Figure 5 is an oblique-angle image of a graphite boat page according to some embodiments of the present specification;

[0020] Figure 6 It is a schematic diagram of the battery substrate status according to some embodiments of this specification. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the embodiments will be described in detail below with reference to the accompanying drawings. Obviously, the contents described below are some examples or embodiments of this specification. For ordinary technicians in this field, without paying creative work, the technical solutions or means disclosed in this specification can also be applied to other scenarios based on these technical contents.

[0022] It should be understood that the "system", "device", "unit" and / or "module" used in this specification is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0023] Unless otherwise specified, technical terms used in this specification to describe components, elements, etc. do not refer to the singular, but may also include the plural. Generally speaking, terms such as "include", "comprise", etc. only indicate that the steps, elements, or components that have been clearly identified are included, and these steps, elements, and components do not constitute an exclusive list, such as the method or device described may also include other steps or components.

[0024] Flowcharts are used in this specification to illustrate the operation steps performed by the device or system of the relevant embodiments, but unless otherwise specified, the order used to describe these steps should not be understood as a limitation on the order in which the steps are performed. A person of ordinary skill in the art can adjust the order in which these steps are performed based on the knowledge and information conveyed by the embodiments of this specification, and the adjustment includes but is not limited to swapping the order, merging multiple steps, and splitting a certain step.

[0025] The solar cell coating production line can include four sections of equipment, namely, the film guide machine, the film inserter, the docking station and the PECVD (plasma enhanced chemical vapor deposition) host. These four sections of equipment can also correspond to different processes or different workstations on the production line. Figure 1It is a schematic diagram of a solar cell coating production line (side view) according to some embodiments of the present specification, which includes a transmission device 1 and a graphite boat 2 of the production line. The graphite boat 2 is transmitted to the corresponding workstation section via the transmission device 1 for different process processing. In some embodiments, the graphite boat can first be conveyed to the inserting machine. The guide machine guides the battery substrates (such as silicon wafers) out of the dried flower basket one by one, and puts them into the material taking area and arranges them neatly. The inserting machine uses a manipulator to take out the neatly arranged battery substrates from the material taking area, inserts them into the graphite boat, and makes the substrate and the side of the graphite boat boat page vertically fit at the same time, and then the battery substrate falls to the card point on the side of the boat page by its own weight to reach a stable positive state. After the insertion process, the graphite boat is transferred to the docking station, where the staff can visually inspect the insertion results of the robot, such as whether there are missing battery substrates at the boat page in the graphite boat, and whether the battery substrates at the boat page are not against the corresponding card points. The staff needs to patch the battery substrates in the graphite boat or adjust the position of the battery substrates that are not in the correct position based on the visual inspection results. After that, the graphite boat is transferred to the corresponding workstation of the next process, such as the PECVD host. The PECVD host is mainly used to perform vacuum plasma coating on the entire graphite boat, so that the battery substrates in the boat are coated with thin films.

[0026] Figure 2 It is a schematic diagram of a graphite boat according to some embodiments of this specification. As shown in the figure, the graphite boat includes multiple long boat pages, which are "connected in series" by screws and nuts. Adjacent long boat pages are separated by elements 23 (such as high-temperature ceramic elements) connected in series on the screws to form a boat page gap (or graphite boat slot) 22. In some embodiments, the part of the long boat page between the two screws can be called a short boat page, or directly called a boat page, which can be understood as a long boat page divided into multiple short boat pages or boat pages by multiple screws. The y direction in the figure is the length direction of the graphite boat (or long boat page), and the x direction is the width direction of the graphite boat or the direction perpendicular to the boat page. The mark 3 in the figure indicates a battery substrate, which is the state when the battery substrate is placed on the side of the boat page. In some embodiments, except for the first and last two boat pages in the x direction, battery substrates are placed on both sides of each of the remaining boat pages, and battery substrates are placed only on the inner side of the first and last two boat pages.

[0027] As mentioned above, the battery substrates are automatically inserted by a robot at the inserting machine and placed on the side of the boat page. However, due to the deformation of the graphite boat due to long-term use (such as warping of the boat page, etc.), or errors in the working position of the robot, there may be missing sheets in the graphite boat that has undergone the inserting process (such as a side wall of a graphite boat is missing a battery substrate) or the battery substrates are in a non-correct state. Figure 6It is a schematic diagram of the battery substrate state shown in some embodiments of this specification. In the figure, the battery substrate 31 is in contact with the side wall of the boat leaf and the edge of the battery substrate is against the corresponding card point 24 protruding on the boat leaf, and is in a correct position. The bottom edge of the battery substrate 32 is misaligned and abuts against the card point corresponding to the side edge, and is in a suspended state, that is, the battery substrate has not completely fallen into the boat leaf. The bottom edge of the battery substrate 33 failed to abut against the corresponding card point, causing the battery substrate to fall below the card point. This state can also be called a dropped sheet. After the insertion process is completed, the battery substrate should be in a correct position. Battery substrates in non-correct positions such as missing sheets, suspended sheets, and dropped sheets need to be adjusted to a correct position before the coating process to ensure the product qualification rate and the production efficiency of the production line.

[0028] In some application scenarios, workers will manually check the status of the battery substrate inside the graphite boat after the insertion process at the docking station. However, due to the large number of slots in the graphite boat and the fact that the silicon wafers are vertically attached to the side walls of the boat, the field of vision is limited, and it is very easy to miss inspections, and then problems will occur in the graphite boat during the coating process, and in serious cases, the entire boat of silicon wafers will be reworked.

[0029] To this end, some embodiments of this specification propose a detection device and a battery substrate detection device for a solar cell coating production line, which can mechanizedly identify the status of battery substrates in a graphite boat, thereby saving labor costs and improving detection efficiency.

[0030] In some embodiments, the detection device may include a battery substrate detection device and a processing control device, wherein the battery substrate detection device is used to detect the battery substrate status at the graphite boat after the insertion process. As an example, the battery substrate detection device can be set at the docking station of the production line. The processing control device is used to determine whether a reminder needs to be issued based on the battery substrate status.

[0031] In some embodiments, the battery substrate detection device can be based on machine vision. Specifically, it can obtain an oblique angle image of the graphite boat on the production line; based on the image, determine the state of the battery substrate on the graphite boat. As mentioned above, the state of the battery substrate can be correct, missing, dropped or hanging. The details of the battery substrate detection device can also be found in the following text and will not be repeated here.

[0032] In some embodiments, the processing control device may include a processor and a storage medium, the storage medium may store computer instructions and data output by the battery substrate detection device, and the processor may execute the computer instructions to automatically determine whether a reminder needs to be issued based on the battery substrate status. As an example, the processing control device may be a system on a chip integrated with a processor and a storage medium, or a desktop computer, a tablet computer, a laptop computer, etc.

[0033] In some embodiments, the reminder may be an alarm signal in the form of sound, light, vibration, etc., to prompt the staff to perform manual intervention, and the manual intervention may include manually adding battery substrates to the relevant boat pages of the graphite boat or manually adjusting the battery substrates to the card points on the boat pages of the graphite boat. In some embodiments, when the data output by the battery substrate detection device indicates that the battery substrates on certain slots or boat pages of the current graphite boat are in a missing or non-positive state, the processing control device may issue a prompt based on this to inform the staff to go to manually insert the substrates or adjust the position of the battery substrates.

[0034] In some embodiments, the reminder may also be a voice announcement or a prompt text output on a corresponding display screen, and the content of the reminder may include the number of the graphite boat slot or boat page that requires manual intervention. For example, the text "1st column, 5th sheet" or "3rd column, 2nd sheet" may be displayed to clearly inform the staff that the battery substrate on which row and which boat page needs to be adjusted. Figure 2 As shown, the multiple boat sheets between the two screws can be regarded as a row, with the graphite boat transmission direction as the reference direction. The closer the row is to the front, the smaller the row number is. With the x direction in the figure as another reference direction, the closer the boat sheet is to the front, the smaller the sheet number is. As an example, Figure 1 The boat page indicated by the mark 21 may be "the 4th piece in the 3rd row". In some other embodiments, the processing control device may count the number of boat pages or slots where the battery substrates are missing or not properly positioned, and then announce the statistical result by voice, for example, the voice announcement may be "there are 5 battery substrates in the graphite boat No. ③ that need to be adjusted".

[0035] In some other embodiments, the processing control device can obtain the battery substrate detection results of a specific graphite boat at different times, and perform analysis and statistics. When the graphite boat is missing or the proportion of the battery substrate pages that are not in the correct position is greater than the proportion threshold and the frequency is higher than the frequency threshold, a prompt can be issued to instruct the staff to replace the graphite boat. Exemplarily, the proportion threshold can be 40%, 70%, 80% or 85%, etc., and the frequency threshold can be 3, 5, 10, 20, etc. The aforementioned thresholds can be set according to actual conditions. It is understandable that the graphite boats on the production line can be reused, and the same graphite boat can be repeated at the workstation corresponding to the insertion process within a certain period of time. Naturally, the battery substrate detection results of the same graphite boat at different times can be obtained by the battery substrate detection device. In some embodiments, the processing control device can also obtain the battery substrate detection results of different graphite boats, and perform lateral comparison and analysis on multiple graphite boats, determine the graphite boats with a large number of pages with missing sheets or non-aligned battery substrates as graphite boats to be updated, and issue reminders to instruct staff to replace these graphite boats.

[0036] In some embodiments, the detection equipment may also include other types of detection devices, and the output data of these detection devices may also be acquired and analyzed by the processing control device. In some embodiments, the processing control device may also comprehensively judge the working status of facilities such as graphite boats on the production line based on the output data of the battery substrate detection device and other types of detection devices, and issue corresponding reminders based on this.

[0037] The detection equipment can obtain various status information on the production line through the detection device, and analyze and process it intelligently, and finally remind the staff to intervene. To a certain extent, it reduces the labor cost and improves production efficiency.

[0038] In some embodiments, the cell substrate detection device may include an image acquisition device and a processing controller. The image acquisition device is located above the solar cell coating production line. When the graphite boat is transmitted on the production line, the image acquisition device can acquire an oblique angle image of the graphite boat page above the graphite boat. In some embodiments, the image acquisition device can be a camera, a video camera, a camera or other equipment. The main optical axis of the image acquisition device and the plane where the graphite boat page is located below the image acquisition device have an inclination angle, thereby acquiring an oblique angle image of the boat page. See Figure 2 , from the oblique angle of the boat page, for the boat page with the battery substrate placed on the side, the upper part of the battery substrate 3 placed on the side of the boat page can be observed. Therefore, based on the image, the processing controller can determine the state of the battery substrate.

[0039] Considering that battery substrates are placed on both sides of most boat pages in the graphite boat, in some embodiments, the battery substrate detection device may include two image acquisition devices, which can be respectively referred to as a first image acquisition device and a second image acquisition device for distinction. Figure 3 The battery substrate detection device described in some embodiments of the present specification is shown. In the figure, the battery substrate detection device 4 includes a first image acquisition device 41 and a second image acquisition device 44. In some embodiments, the first image acquisition device and the second image acquisition device are arranged relative to each other so as to acquire images of oblique angles on both sides of the graphite boat. In some embodiments, the angle between the main optical axis of the first image acquisition device 41 and the main optical axis of the second image acquisition device 44 can be from a numerical interval (0,180), for example, the angle can be 10, 15, 20, 25, 30, 44, 50, 60, 68, 70, 120, or 155. In some other embodiments, the angle can be from a numerical interval [10,70], or from a numerical interval [30,60]. The unit of the angle in some embodiments of the present specification is degree (°).

[0040] In some embodiments, the plane where the lower edge of the lens of the first image acquisition device 41 is located is parallel to the horizontal plane (eg Figure 3 The angle of the horizontal dotted line in the image acquisition device is from the numerical interval [5, 70], such as 10, 12, 15, 18, 20, 25, 30, 36, 48, 55, 60 or 65. In some other embodiments, the angle can further come from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20]. Symmetrically, the angle between the plane where the lower edge of the lens of the second image acquisition device is located and the horizontal plane is from the numerical interval [5, 70] or from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20]. Such an arrangement can form an effective slit detection effect and improve the detection accuracy. The lower edge of the lens of the image acquisition device can be the lower edge of the outer shell of its optical element (such as a plurality of convex lenses and concave lenses of different thicknesses), and accordingly, the plane where the lower edge of the lens is located is the plane where the lower edge of the aforementioned shell is located. In some embodiments, the angle between the plane where the lower edge of the lens of the first image acquisition device 41 is located and the horizontal plane may be the same as or different from the angle between the plane where the lower edge of the lens of the second image acquisition device 44 is located and the horizontal plane.

[0041] In some embodiments, the image acquisition device may specifically be a line scan camera, and its imaging area is a long and narrow rectangular area. It is understandable that when the length and width of the rectangular area are relatively large, the imaging area can be regarded as linear. The line scan camera can perform high-resolution imaging of "a row" of the photographed object. In some embodiments, in order to obtain images of multiple locations of the photographed object, or to obtain a complete image of the photographed object, the line scan camera needs to move along a certain direction and take pictures multiple times. Finally, the results of each shooting are "stitched" to obtain a larger range or a complete range of images of the photographed object.

[0042] In some embodiments, the battery substrate detection device further includes a mobile module 43, and the first image acquisition device 41 and the second image acquisition device 44 are disposed on the mobile module 43. The mobile module can drive the first image acquisition device 41 and the second image acquisition device 44 to move along the width direction of the graphite boat on the production line (such as Figure 2 The boat moves in the x direction (as shown) to capture images of multiple boat pages.

[0043] In some embodiments, the moving module may include a crossbar and a slider. Figure 4 is a schematic diagram of a battery substrate detection device installed on a production line according to some embodiments of this specification, Figure 4It can be seen intuitively that the mobile module 43 further includes a crossbar 432 and a slider 431, wherein the crossbar 432 is fixed to the upper beam of the transmission device and is arranged in a direction perpendicular to the transmission direction, and the slider 431 can move relative to the crossbar 432. As an example, the slider 431 can be sleeved on the crossbar 432, and the slider is driven by a pneumatic device (not shown in the figure), the pneumatic device can include an air pump, a cylinder and a piston, and the pneumatic device can be fixedly installed on the upper beam of the transmission device, and its piston is connected to the slider 431 in a transmission manner. The air pump presses air into the cylinder to push the piston, and the piston causes the slider 431 to move forward and backward along the crossbar 432. The image acquisition device is arranged on the slider 431, thereby realizing movement along the x direction. It should be noted that the description here should not be understood as a limitation on the mobile modules shown in some embodiments of this specification, and other specific structures or structures of the mobile modules that can drive the image acquisition device to move along the x direction can be regarded as within the scope of this specification.

[0044] In some embodiments, the angle of the image acquisition device can be adjusted so that the length direction of its imaging area is consistent with the length direction of the graphite boat and sheet, so that the line scan camera can obtain a complete image of a certain graphite boat and sheet at an oblique angle through one shot, thereby improving the detection efficiency. The complete image mentioned here refers to an image that can be used alone to determine the relative position information of the boat and the battery substrate thereon, without the need for additional images taken at other times or angles.

[0045] In some embodiments, the battery substrate detection device 4 may further include a first line light source 42 and a second line light source 45. The line light source may refer to a linear intersection area between the incident light and the illuminated object. In actual application scenarios, the intersection area is a long and narrow area (such as a rectangular area, a nearly elliptical area, etc.). When the length and width of the area are relatively large, the intersection area can be considered to be linear. In some embodiments, the line light source may be formed by a rectangular array of multiple LED lamp beads. When multiple LED lamp beads emit light at the same time, the light shines on the object to form a long and narrow rectangular light band. In some other embodiments, the line light source may refer to a light source that is linear, such as an incandescent lamp with a long and narrow lamp tube. The first line light source 42 is used to fill in the light when the first image acquisition device 41 acquires an image, and the second line light source 45 is used to fill in the light when the second image acquisition device 44 acquires an image. The length direction of the first line light source 42 and the second line light source 45 is consistent with the length direction of the graphite boat page, so as to achieve the purpose of fully filling in the light for the line scan camera. From Figure 4 It can be more intuitively seen that the length direction of the line light source is consistent with the direction of the graphite boat. The consistency can be understood as parallel or approximately parallel due to unavoidable installation errors. In some embodiments, the line light source is also arranged on the mobile module, thereby keeping relatively still with the image acquisition device to ensure the stability of the fill light process.

[0046] Figure 5 is an oblique-angle image of a graphite boat sheet according to some embodiments of the present specification, which is captured by the first image acquisition device or the second image acquisition device. Figure 5 It can be seen that the image area captured by the line scan camera at one time includes a smaller number of boat pages, such as one or two boat pages. Figure 5 The sides of the boat leaf 21 are respectively attached with the battery substrate 3. In some embodiments, the relative position relationship between the first image acquisition device 41 and the first line light source 42 (or the second image acquisition device 44 and the second line light source 45) can be adjusted to obtain an image with a stronger contrast between the boat leaf and the battery substrate and a clearer picture.

[0047] The lens of the line scan camera is a long and narrow rectangle, or can be considered as a linear shape. When the image acquisition device is a line scan camera, the plane formed by the main optical axis and the straight line where the camera is located can be considered as the main light plane, and the emitted light of the line light source can be considered to be located in the same plane, or it can be called the light-emitting surface of the line light source. In some embodiments, the relative position relationship between the image acquisition device and the line light source for its fill light can be adjusted so that the angle between the main light plane of the image acquisition device and the light-emitting surface of its line light source is from the numerical interval (0, 90), for example, the angle can be 5, 8, 10, 12, 18, 20, 25, 30, 40, 48, 55, 60, 67, 70, 80 or 85. In some other embodiments, the angle can be further from the numerical interval [5, 60], further from the numerical interval [8, 50], or further from the numerical interval [10, 30]. In this way, the image with gradually enhanced contrast can be obtained. In some embodiments, the light emitting surface of the linear light source can be made to intersect with the upper end surface of a boat page of the graphite boat, or the light of the linear light source can be made to hit the upper end surface of the boat page, thereby further improving the contrast of the image of the boat page taken by the image acquisition device.

[0048] In some embodiments, the processing controller may be a programmable chip, such as a single chip microcomputer, a CPLD chip, etc., or the processing controller may be a desktop computer, a laptop computer, a tablet computer, etc., which includes a processor. The processing controller may determine the relative position information between the battery substrate on the graphite boat page and the boat page based on the image acquired by the image acquisition device, and determine the state of the battery substrate at the graphite boat page based on the relative position information.

[0049] Continue to see Figure 5 , the processing controller can determine the distance between the upper edge of the battery substrate 31 and the upper edge 211 of the boat page where the battery substrate is located based on the image. In some embodiments, when the battery substrate is in the upright state, it is not parallel to the upper edge of the boat page, such as Figure 6Therefore, the distance from one or more points on the upper edge of the battery substrate 31 to the upper edge 211 of the boat page where the battery substrate is located can be obtained, such as Figure 5 d1 and d2 in. By comparing the distance size obtained based on the image (or called the detection image) with the standard value, the state of the battery substrate can be determined. The standard value can be obtained based on the image taken by the image acquisition device when the battery substrate is in the positive position, or it can be obtained by actual measurement. Therefore, the standard value can be the number of pixels in the image, or it can be the length value in the spatial coordinate system. Correspondingly, the measured value compared with the standard value can be the number of pixels in the detection image or the length value based on the detection image converted to the spatial coordinate system. As an example, the distances d1 and d2 determined based on the detection image currently acquired by the battery substrate detection device can be compared with the standard values ​​respectively. When both distances are greater than the standard values, it can be determined that the battery substrate is in a falling state. When at least one distance is less than the standard value, it can be determined that the battery substrate is in a suspended state. When the upper edge of the battery substrate or the battery substrate area cannot be detected in the image, it can be determined that the battery substrate is missing.

[0050] In some embodiments, the processing controller can determine the angle α between the upper edge of the battery substrate 31 and the upper edge 211 of the boat page where the battery substrate is located based on the image, compare it with the angle standard value, and determine the state of the battery substrate based on the comparison result. As an example, when the angle is significantly different from the angle standard value, it can be determined that the battery substrate is in a non-normal state. The angle standard value can be determined based on a detection image in which it is known that the battery substrate is in a normal state.

[0051] In actual scenarios, there may be gaps between the battery substrate in a non-proper position and the side wall of the boat page. In some embodiments, it can be determined whether the battery substrate needs to be adjusted by determining whether there is a gap in the image or the size of the gap. As an example, when a gap is detected in the image, it can be determined that the battery substrate is in a non-proper position and needs to be adjusted. Alternatively, the size of the gap, such as the width of the gap, can be further determined. When the gap width is greater than the standard width value, it can be determined that the battery substrate is in a non-proper position. The standard width value can be determined based on actual observations, such as being set to 1.5 mm, 2 mm, or 3 mm, or set to 10 pixels, 20 pixels, etc.

[0052] In some embodiments, the aforementioned distance, angle or size can be obtained by image processing means, such as image binarization, edge detection, pixel number statistics and other means. In some other embodiments, a large number of sample images can be collected by an image acquisition device, and then these images can be marked. The sample labels can include positive position, missing pieces, dropped pieces and hanging pieces, and then these labeled sample images are used to train the machine learning model. After training, the machine learning model can process the detection image and then directly output the battery substrate state. Specifically, the trained machine learning model can be run on a processing controller so that the processing controller can determine the battery substrate state based on the image collected by the image acquisition device.

[0053] The beneficial effects that may be brought about by the embodiments of this specification include but are not limited to: (1) The detection equipment can obtain various status information on the production line, and intelligently analyze and process it, and finally remind the staff to intervene. To a certain extent, the labor cost is reduced and the production efficiency is improved; (2) The battery substrate detection device can obtain a detection image with strong contrast and high resolution, which helps to improve the detection accuracy; (3) The processing controller can accurately obtain dimensions such as distance and angle through image processing methods, and can automatically and efficiently determine the state of the battery substrate; (4) The detection image is processed by a machine learning model to obtain the battery substrate state, which can further improve the detection speed. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced may be any one or a combination of the above, or any other possible beneficial effects.

[0054] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are taught in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

Claims

1. A battery substrate detection device, comprising a first image acquisition device and a processing controller; The first image acquisition device is located above the graphite boat on the solar cell coating production line so as to acquire an oblique angle image of the graphite boat on the production line; The processing controller is used to determine the state of the battery substrate on the graphite boat page based on the image; The state of the battery substrate includes missing, fallen or hanging substrate; The processing controller is further used to determine the relative position information between the battery substrate and the graphite boat page on the graphite boat page based on the image, and determine the state of the battery substrate at the graphite boat page based on the relative position information; The relative position information includes one or more of the following information: the distance from at least one point on the upper edge of the battery substrate to the upper edge of the boat page where the battery substrate is located, and the angle between the upper edge of the battery substrate and the upper edge of the boat page where the battery substrate is located.

2. The battery substrate detection device according to claim 1, further comprising a second image acquisition device; The second image acquisition device is arranged relative to the first image acquisition device so that the angle between the main optical axes of the two image acquisition devices is from the numerical interval (0, 180), thereby being able to acquire images at oblique angles on both sides of the graphite boat.

3. The battery substrate detection device according to claim 2, further comprising a moving module; The first image acquisition device and the second image acquisition device are arranged on the moving module, and the moving module is used to drive the first image acquisition device and the second image acquisition device to move along the width direction of the graphite boat on the production line.

4. The battery substrate detection device according to claim 3, further comprising a first line light source and a second line light source, wherein the first line light source is used to provide fill light when the first image acquisition device acquires the image, and the second line light source is used to provide fill light when the second image acquisition device acquires the image, and the first line light source and the second line light source are also arranged on the mobile module; The first image acquisition device and the second image acquisition device are line scan cameras; the length direction of the imaging area of ​​the first image acquisition device, the length direction of the imaging area of ​​the second image acquisition device, the length direction of the first line light source, the length direction of the second line light source and the length direction of the graphite boat page are consistent.

5. The battery substrate detection device according to claim 4, wherein the angle between the main light surface of the first image acquisition device and the light emitting surface of the first line light source is from the numerical interval (0, 90) or from the numerical interval [5, 60] or from the numerical interval [8, 50] or from the numerical interval [10, 30]; The angle between the main light surface of the second image acquisition device and the light emitting surface of the second line light source is in the numerical interval (0, 90) or in the numerical interval [5, 60] or in the numerical interval [8, 50] or in the numerical interval [10, 30]; The light emitting surface of the first line light source intersects with the upper end surface of at least one boat leaf of the graphite boat on the production line, and the light emitting surface of the second line light source intersects with the upper end surface of at least one boat leaf of the graphite boat on the production line.

6. The battery substrate detection device according to claim 2, wherein the angle between the plane where the lower edge of the lens of the first image acquisition device is located and the horizontal plane is from the numerical interval [5, 70] or from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20]; The angle between the plane where the lower edge of the lens of the second image acquisition device is located and the horizontal plane is from the numerical interval [5, 70] or from the numerical interval [10, 60] or from the numerical interval [12, 30] or from the numerical interval [15, 20].

7. A detection device for a solar cell coating production line, comprising a cell substrate detection device and a processing control device; The battery substrate detection device is used to detect the battery substrate status at the graphite boat page after the insertion process; The processing control device is used to determine whether a reminder needs to be issued based on the state of the battery substrate so that the staff can perform manual intervention; The manual intervention includes one or more of the following: replacing the graphite boat, manually adding the battery substrate to the relevant boat page of the graphite boat, and manually adjusting the battery substrate to the stuck point on the boat page of the graphite boat; The battery substrate detection device is further used to determine the relative position information between the battery substrate on the graphite boat page and the boat page based on the oblique angle image of the graphite boat page, and determine the battery substrate state at the graphite boat page based on the relative position information; The relative position information includes one or more of the following information: the distance from at least one point on the upper edge of the battery substrate to the upper edge of the boat page where the battery substrate is located, and the angle between the upper edge of the battery substrate and the upper edge of the boat page where the battery substrate is located.

8. The detection device according to claim 7, wherein the battery substrate detection device is used for: Acquire an oblique-angle image of the graphite boat sheets on the production line; Determine relative position information between the battery substrate and the graphite boat page on the boat page based on the image; Determine the state of the battery substrate at the page of the graphite boat based on the relative position information; The battery substrate status includes missing, fallen or hanging substrates.

9. The detection equipment according to claim 7, wherein the battery substrate detection device is the battery substrate detection device according to any one of claims 1 to 7.

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