Photovoltaic module image acquisition method, photovoltaic module position error detection method and photovoltaic module assembly control method

Abstract

The invention relates to a photovoltaic module image acquisition method, a photovoltaic module position error detection method and a photovoltaic module assembling control method, which can acquire a sample image of any assembled part in time in a photovoltaic module pre-assembling process. The sample image is used for analyzing whether the position of the currently assembled part has an offset problem or not by a computer, so that the production time consumed in the process of producing a defective photovoltaic module is reduced, and the number of qualified photovoltaic modules produced in unit time can be correspondingly increased; therefore, the production efficiency of qualified photovoltaic modules can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic module production, and in particular to a photovoltaic module image acquisition method, a photovoltaic module position error detection method, and a photovoltaic module assembly process control method. Background Art

[0002] The production process of photovoltaic modules includes the process of making battery strings. In the prior art, the quality inspection of battery strings is carried out after the battery strings are made. Therefore, the inspection method of the prior art cannot find problems in time during the assembly process of battery strings, that is, the prior art easily leads to a large amount of production time being consumed in the process of producing problematic battery strings, and accordingly, the number of qualified battery strings produced per unit time is low, thereby resulting in low production efficiency of qualified photovoltaic modules. Summary of the invention

[0003] In view of this, the present application provides a photovoltaic module image acquisition method, a photovoltaic module position error detection method and a photovoltaic module assembly process control method, which can improve the production efficiency of qualified photovoltaic modules.

[0004] In a first aspect, the present application provides a photovoltaic assembly image acquisition method, the image acquisition method comprising:

[0005] Step S1: using a first image collector to successively capture sample images of a target object corresponding to at least two adjacent capture stations.

[0006] Step S2: using a second image collector to successively collect sample images of the target object corresponding to at least two adjacent collection stations.

[0007] The acquisition station corresponding to the first image collector is adjacent to the acquisition station corresponding to the second image collector, and the acquisition station currently corresponding to the second image collector is the acquisition station to be subsequently corresponding to the first image collector.

[0008] The target object of which the sample image is captured by the first image collector or the second image collector at a single time is the back film of the photovoltaic module, the back welding tape of the photovoltaic module, the battery cell of the photovoltaic module, the top welding tape of the photovoltaic module or the top film of the photovoltaic module.

[0009] The sample images are used to be acquired by a computer and the amount of position error with respect to the target object is calculated.

[0010] Optionally, step S1 includes step S11 and / or step S12:

[0011] Step S11 includes:

[0012] Step S111: using a first image collector to collect a sample image of the back film located at a corresponding collection station.

[0013] Step S112: using a first image collector to collect a sample image of the back solder tape located at a corresponding collection station and above the back cover film.

[0014] Step S113: using a first image collector to collect a sample image of a cell located at a corresponding collection station and above the back solder strip.

[0015] Step S114: using a first image collector to collect a sample image of the top solder strip located at a corresponding collection station and above the battery cell.

[0016] Step S115: using a first image collector to collect a sample image of the top covering film located at a corresponding collection station and above the top welding tape.

[0017] Step S12 includes:

[0018] Step S121: using a first image collector to collect a sample image of a top soldering tape located at a corresponding collection station and above a battery cell.

[0019] Step S122: using a first image collector to collect a sample image of the top covering film located at a corresponding collection station and above the top welding tape.

[0020] Optionally, if step S1 includes step S11 and step S12, step S12 is performed after step S11 is performed.

[0021] Optionally, step S2 includes step S21 and / or step S22:

[0022] Step S21 includes:

[0023] Step S211: using a second image collector to collect a sample image of the back film located at a corresponding collection station.

[0024] Step S212: using a second image collector to collect a sample image of the back solder tape located at a corresponding collection station and above the back cover film.

[0025] Step S213: using a second image collector to collect a sample image of the battery cell located at a corresponding collection station and above the back solder strip.

[0026] Step S22 includes:

[0027] Step S221: using a second image collector to collect a sample image of the back film located at a corresponding collection station.

[0028] Step S222: using a second image collector to collect a sample image of the back solder tape located at a corresponding collection station and above the back cover film.

[0029] Step S223: using a second image collector to collect a sample image of the battery cell located at a corresponding collection station and above the back solder strip.

[0030] Step S224: using a second image collector to collect a sample image of the top solder strip located at a corresponding collection station and above the battery cell.

[0031] Step S225: using a second image collector to collect a sample image of the top covering film located at a corresponding collection station and above the top welding tape.

[0032] Optionally, step S1 includes step S13: using a first image collector to collect a sample image of a top covering film located at a corresponding collection station and located above the top welding strip. Step S2 includes step S23: using a second image collector to collect a sample image of a battery cell located at a corresponding collection station and located above the back welding strip. The method of the present application also includes step S0: after executing step S13 and step S23, the collection station collected by the first image collector in step S13 is moved out of the collection range of the first image collector, the collection station collected by the second image collector in step S23 is moved to the collection range of the first image collector, and the collection station not collected by the second image collector is moved to the collection range of the second image collector; or, after executing step S13 and step S23, the second image collector is moved so that the collection station not collected by the second image collector is located within the collection range of the moved second image collector, and the first image collector is moved so that the collection station collected by the second image collector in step S23 is located within the collection range of the moved first image collector.

[0033] In a second aspect, the present application provides a photovoltaic module position error detection method, the detection method comprising:

[0034] Step A: Using a computer to obtain a sample image of the target object from an image collector.

[0035] Step B: Calculate the position error of the target object based on the sample image using a computer.

[0036] Among them, the sample image is obtained according to the photovoltaic module image acquisition method described in the above content, and the target object is the back film of the photovoltaic module, the back welding tape of the photovoltaic module, the battery cell of the photovoltaic module, the top welding tape of the photovoltaic module or the top film of the photovoltaic module.

[0037] Optionally, step B includes:

[0038] Step B1: Using a computer to identify the detection reference and target object in the sample image.

[0039] Step B2: Calculate sample geometric dimensions between the detection reference and the target object using a computer, wherein the sample geometric dimensions include sample distance dimensions and / or sample angle dimensions.

[0040] Step B3: Calculate the difference between the reference dimension and the sample geometric dimension using a computer, and output the difference as a position error amount.

[0041] Optionally, step B1 includes:

[0042] When the target object is a back film, step B11 is executed: using a computer to identify a detection reference located at the collection station and an edge of the back film.

[0043] When the target object is a back solder strip located above the back cover film, execute step B12: using a computer to identify a detection reference located at a collection station, an edge of the back cover film, an edge of the back solder strip, and an end of the back solder strip.

[0044] When the target object is a cell located above the back solder strip, step B13 is performed: using a computer to identify a detection reference located at the acquisition station and an edge of the cell.

[0045] When the target object is a top solder strip located above the battery cell, step B14 is performed: using a computer to identify the edge of the battery cell, the edge of the top solder strip, and the end of the top solder strip.

[0046] When the target object is a top cover film located above the battery cell and the top solder tape, step B15 is performed: using a computer to identify the edge of the battery cell and the edge of the top cover film.

[0047] Optionally, step B includes:

[0048] Step B4: using a computer to identify the sample position of the target object in the sample image.

[0049] Step B5: Calculate the geometric dimensions between the reference position of the reference object and the sample position in the reference image using a computer, and output the geometric dimensions as position error quantities, wherein the geometric dimensions include distance dimensions and / or angle dimensions.

[0050] In a third aspect, the present application provides a photovoltaic module assembly process control method, the control method comprising:

[0051] Step α: using a computer to obtain the position error of the target object, the position error is obtained according to the photovoltaic module position error detection method described above.

[0052] Step β: using a computer to compare the size relationship between the position error amount and the lower limit of the allowable error value range, and using a computer to compare the size relationship between the position error amount and the upper limit of the allowable error value range.

[0053] When the position error is greater than the lower limit and less than the upper limit, step γ is performed: continue to assemble other parts related to the photovoltaic module, or press the assembled parts related to the photovoltaic module.

[0054] When the position error is less than the lower limit, or when the position error is greater than the upper limit, step θ is executed: pausing the photovoltaic module assembly process.

[0055] Beneficial effects:

[0056] The method provided in the present application can timely collect sample images of any assembled parts during the pre-assembly of battery strings. The sample images are used by a computer to analyze whether there is an offset problem in the position of the currently assembled parts, so as to reduce the production time consumed in the process of producing problematic battery strings. Correspondingly, the number of qualified battery strings produced per unit time can be increased, thereby improving the production efficiency of qualified photovoltaic modules.

[0057] The method provided in the present application is also applicable to timely collecting sample images of any assembled parts during the pre-assembly of laminates. The sample images are used by a computer to analyze whether there is an offset problem in the position of the currently assembled parts, so as to reduce the production time consumed in the process of producing problematic laminates. Correspondingly, the number of qualified laminates produced per unit time can be increased, thereby improving the production efficiency of qualified photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Figure 1 is a side view of a photovoltaic module in a specific embodiment;

[0060] Figure 2 for Figure 1 A partial enlarged view of part A;

[0061] Figure 3 A three-dimensional diagram of a battery string in a specific embodiment;

[0062] Figure 4 for Figure 1 A partial enlarged view of part B;

[0063] Figure 5 It is a schematic structural diagram of a conveyor belt, a first image collector and a second image collector in a specific embodiment;

[0064] Figure 6 to Figure 22 A schematic diagram of the changing states of the conveyor belt, the first image collector, the second image collector and the battery string during the assembly process;

[0065] Fig.23 A top view of a conveyor belt and a back film in a specific embodiment;

[0066] Fig.24 A top view of a conveyor belt, a back cover film and a back welding belt in a specific embodiment;

[0067] Fig.25 A top view of a conveyor belt, a back soldering belt and a battery cell in a specific embodiment;

[0068] Fig.26 A top view of a conveyor belt, a back soldering belt, a battery cell and a top soldering belt in a specific embodiment;

[0069] Fig. 27 The figure is a top view of a conveyor belt, a back solder belt, a battery cell, a top solder belt and a top cover film in a specific embodiment.

[0070] Reference numerals:

[0071] 10- Photovoltaic modules;

[0072] 1-Back film;

[0073] 11 - first edge;

[0074] 2- Back solder strip;

[0075] 21 - second edge;

[0076] 22- a first end portion;

[0077] 3-Battery cell;

[0078] 31 - third edge;

[0079] 4- Top welding strip;

[0080] 41 - fourth edge;

[0081] 42- second end;

[0082] 5-top film;

[0083] 51-Fifth Edge;

[0084] 6-adhesive film;

[0085] 7-top adhesive film;

[0086] 8-Back photovoltaic glass;

[0087] 9-top photovoltaic glass;

[0088] 20-a first image collector;

[0089] 30- a second image collector;

[0090] 40- conveyor belt;

[0091] 40a-first collection station;

[0092] 40b- second collection station;

[0093] 40c-the third collection station;

[0094] 40d-the fourth collection station;

[0095] 401-Baseline;

[0096] 402 - Reference point. DETAILED DESCRIPTION

[0097] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0098] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0099] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0100] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0101] Please refer to Figure 1-Figure 2As shown, the photovoltaic module 10 includes a top photovoltaic glass 9, a top adhesive film 7, a top covering film 5, a top welding tape 4, a battery cell 3, a back welding tape 2, a back covering film 1, a back adhesive film 6 and a back photovoltaic glass 8 stacked from top to bottom. In addition, the photovoltaic module 10 also includes a busbar (not shown in the figure). In the process of manufacturing the photovoltaic module 10, it is necessary to pre-connect multiple top covering films 5, multiple top welding tapes 4, multiple battery cells 3, multiple back welding tapes 2 and multiple back covering films 1 to form a structure as shown in FIG. Figure 3 The cell string shown; generally, the photovoltaic module 10 includes multiple cell strings, which need to be connected by a busbar; then the top photovoltaic glass 9, the top adhesive film 7, the connected cell strings, the back adhesive film 6 and the back photovoltaic glass 8 are pressed together by a laminating machine to form a laminate; and then a protective frame (not shown in the figure) is installed on the edge of the laminate. Of course, the back photovoltaic glass 8 can also be replaced by a back plate.

[0102] Please refer to Figure 3 As shown, the same battery string includes multiple units, and any unit includes Figure 4 The top film 5, top soldering tape 4, battery cell 3, back soldering tape 2 and back film 1 are stacked from top to bottom. Taking the first unit, the second unit and the third unit as examples, the back soldering tape 2 of the first unit is used to connect with the busbar, the top soldering tape 4 of the first unit is connected with the back soldering tape 2 of the second unit, and the top soldering tape 4 of the second unit is connected with the back soldering tape 2 of the third unit. And so on. Figure 4 As shown, every two adjacent units are connected by a top welding ribbon 4 of one and a back welding ribbon 2 of the other. The top welding ribbon 4 of the last unit is used to connect with other busbars.

[0103] It should be noted that the top welding strip 4 and the back welding strip 2 connected in each two adjacent units are integrally formed, which can also be understood as follows: Figure 4 As shown, a portion of the same soldering ribbon is located above the battery cell 3 of one unit to serve as a top soldering ribbon 4 , and another portion of the same soldering ribbon is located below the battery cell 3 of another unit to serve as a back soldering ribbon 2 .

[0104] The assembly of the battery string requires the use of direct film covering technology (I ntegrated Film Covering, I FC). Specifically, after stacking the top film 5, top welding tape 4, battery cell 3, back welding tape 2 and back film 1 required for each unit and arranging the required number of units, the pre-assembled battery string is sent to the pre-pressing equipment, and a pressing force is applied to the pre-assembled battery string, and the pre-assembled battery string is placed in an environment with a set temperature so that the top film 5 and the back film 1 are connected to the battery cell 3 respectively. Correspondingly, the top welding tape 4 is limited by the top film 5 to the metal area (also known as the electrode or grid line) on one side of the battery cell 3, and the back welding tape 2 is limited by the back film 1 to the metal area on the other side of the battery cell 3, thereby forming the required battery string. The metallization combination of the top welding tape 4 and the metal area on one side of the battery cell 3 and the metallization combination of the back welding tape 2 and the metal area on the other side of the battery cell 3 need to be completed in the subsequent lamination operation using a laminator.

[0105] From the above content, it can be known that during the pre-assembly process of the battery string, if the position of at least one of the top film 5, top welding tape 4, battery cell 3, back welding tape 2 and back film 1 is offset relative to the others, for example, the top welding tape 4 is offset relative to the battery cell 3, it is easy to cause the electrical connection contact area between the metal area of ​​the battery cell 3 and the top welding tape 4 after pre-pressing to be small or even no electrical connection contact area, which can easily lead to poor photoelectric conversion efficiency of the photovoltaic module 10, or even cause the photovoltaic module 10 to fail. It can be seen that the position accuracy of each part in the pre-assembly process of the battery string has a great influence on the yield rate of the photovoltaic module 10. Therefore, before pre-pressing the battery string, it is necessary to eliminate the problematic battery string.

[0106] The following content of this article introduces the image acquisition method, position error detection method and assembly control method provided by the embodiments of the present application, which can be used to eliminate problematic battery strings.

[0107] The image acquisition method of the embodiment of the present application includes:

[0108] Step S1: using a first image collector to successively collect sample images of target objects (parts of a battery string) corresponding to at least two adjacent collection stations.

[0109] Step S2: using a second image collector to successively collect sample images of target objects (parts of a battery string) corresponding to at least two adjacent collection stations.

[0110] The acquisition station corresponding to the first image collector is adjacent to the acquisition station corresponding to the second image collector, and the acquisition station currently corresponding to the second image collector is the acquisition station to be subsequently corresponding to the first image collector.

[0111] The target object for which the sample image is captured by the first image collector or the second image collector at a single time is a back cover film, a back soldering tape, a battery cell, a top soldering tape or a top cover film.

[0112] The sample images are used to be acquired by a computer and the amount of position error with respect to the target object is calculated.

[0113] In the image acquisition method of the embodiment of the present application, the image acquisition process is related to the battery string pre-assembly process. Therefore, this article introduces the image acquisition method in detail based on the battery string pre-assembly process.

[0114] During the pre-assembly of the battery string, the following can be used: Figure 5 The conveyor belt 40 shown carries the parts of the battery string, that is, the battery string is pre-assembled on the conveyor belt 40. At the same time, during the pre-assembly process, the first image collector 20 and the second image collector 30 are used to collect sample images of the pre-assembled parts. After collecting the sample image, the computer can calculate the position error between the position of the pre-assembled parts and the preset position according to the sample image, and the computer can compare the position error and the allowable error value range. If the position error is within the allowable error value range, the subsequent pre-assembly, image acquisition and position error calculation operations are continued. If the position error detected each time is within the allowable error value range, the above process is repeated until the pre-assembly of the battery string is completed, and the conveyor belt 40 will send the pre-assembled battery string to the pressing device for pre-pressing, so that the coating and the battery cell are connected. If the current detected position error is outside the allowable error value range, the computer will issue a stop command to stop the current battery string pre-assembly process, and the conveyor belt 40 will send the current problem battery string to the recycling position, and the producer can promptly check the problem of the production equipment.

[0115] Of course, the conveyor belt 40 can also be replaced by other production lines for carrying and conveying parts of battery strings, or the conveyor belt 40 can also be replaced by a loading platform for carrying parts of battery strings only. The following content of this article mainly describes the conveyor belt 40 as a component for carrying battery strings.

[0116] Please refer to Figure 5As shown, the conveyor belt 40 may have a first collection station 40a, a second collection station 40b, a third collection station 40c and a fourth collection station 40d, each of which may be used to carry parts of a battery string that needs to be preassembled, and each collection station corresponds to a unit of the preassembled battery string. This article mainly describes the example of a preassembled battery string including four units, and accordingly, describes the example of a conveyor belt 40 including four collection stations. If the preassembled battery string includes other numbers of units, the conveyor belt 40 may also include other numbers of collection stations accordingly. Of course, the number of collection stations provided by the conveyor belt 40 may be greater than the number of units provided by a string of preassembled batteries. For example, the number of collection stations provided by the conveyor belt 40 is at least twice the number of units provided by a string of preassembled batteries, that is, the conveyor belt 40 can carry at least two strings of preassembled batteries.

[0117] The following content of this article is mainly described by taking "the conveyor belt 40 has a first collecting station 40a, a second collecting station 40b, a third collecting station 40c and a fourth collecting station 40d" as an example.

[0118] Please refer to Figure 6 As shown, the back film 1 for forming the first unit of the battery string is first placed at the first acquisition station 40a of the conveyor belt 40, and the sample image of the back film 1 located at the first acquisition station 40a is acquired by the first image acquisition device 20. The sample image can be analyzed by a computer, and if the position error of the back film 1 is within the allowable error value range, the next operation is continued, and if the position error of the back film 1 is not within the allowable error value range, the subsequent operation is stopped.

[0119] in, Figure 6 The dotted lines at the two ends of the conveyor belt 40 that are relatively arranged in the direction X represent the structural cross-sectional lines, that is, the embodiment of the present application does not specifically limit the length of the conveyor belt 40 in the direction X. Figure 6 The dotted line connected to the first image collector 20 and the dotted line connected to the second image collector 30 represent the image acquisition range.

[0120] It should be noted that, in order to facilitate a quick understanding of the image acquisition method of the embodiment of the present application, the analysis results after each image acquisition in the subsequent content of this article are assumed to be that the position error of the detected target object is within the allowable error value range, that is, the next operation can be continued. The reader can also understand from the above-mentioned content that the subsequent image acquisition process can be stopped because the position error of the detected target object is outside the allowable error value range.

[0121] Please refer to Figure 7As shown, the back film 1 for forming the second unit of the battery string is placed at the second acquisition station 40b of the conveyor belt 40, and the second image collector 30 is used to acquire a sample image of the back film 1 located at the second acquisition station 40b.

[0122] Please refer to Figure 8 As shown, a back soldering tape 2 for forming the first unit of a battery string is placed above the back cover film 1 located at the first acquisition station 40a, and a sample image of the back soldering tape 2 located at the first acquisition station 40a is acquired by a first image acquisition device 20.

[0123] Among them, the number of back solder strips 2 for each unit of the battery string can be multiple, and the multiple back solder strips 2 are arranged at intervals along a set direction (for example, direction Z) so that the position of each back solder strip 2 can correspond to the position of the metal area of ​​the battery cell to be placed subsequently.

[0124] Please refer to Fig. 9 As shown, a cell 3 for forming the first unit of a cell string is placed above the back solder strip 2 located at the first acquisition station 40a, and a sample image of the cell 3 located at the first acquisition station 40a is acquired by the first image acquisition device 20.

[0125] Please refer to Fig.10 As shown, a top soldering tape 4 for forming the first unit of the battery string is placed above the battery sheet 3 located at the first acquisition station 40a, and a back soldering tape 2 for forming the second unit of the battery string is placed above the back film 1 located at the second acquisition station 40b, wherein the top soldering tape 4 and the back soldering tape 2 placed in this step are integrally formed, so the top soldering tape 4 and the back soldering tape 2 need to be placed at the same time. The sample image of the top soldering tape 4 located at the first acquisition station 40a is acquired by the first image acquisition device 20, and the sample image of the back soldering tape 2 located at the second acquisition station 40b is acquired by the second image acquisition device 30 at the same time.

[0126] Among them, the number of integrally formed solder strips (back solder strip 2 and top solder strip 4) placed in this step can be multiple, and the multiple solder strips are arranged at intervals along a set direction (for example, direction Z) so that the position of each solder strip can correspond to the position of the metal area of ​​the battery cell.

[0127] Please refer to Fig.11 As shown, a top cover film 5 for forming the first unit of the battery string is placed above the top solder strip 4 located at the first acquisition station 40a, and a battery cell 3 for forming the second unit of the battery string is placed above the back solder strip 2 located at the second acquisition station 40b. The sample image of the top cover film 5 located at the first acquisition station 40a is acquired by the first image acquisition device 20, and the sample image of the battery cell 3 located at the second acquisition station 40b is acquired by the second image acquisition device 30.

[0128] Please refer to Fig.12 As shown, the back film 1 used to form the third unit of the battery string is placed at the third acquisition station 40c, and the conveyor belt 40 drives the carried parts to shift along the direction X, so that the first image collector 20 corresponds to the second acquisition station 40b, and the second image collector 30 corresponds to the third acquisition station 40c, and the second image collector 30 is used to collect a sample image of the back film 1 located at the third acquisition station 40c.

[0129] Please refer to Fig.13 As shown, a top soldering tape 4 for forming the second unit of the battery string is placed above the battery cell 3 located at the second acquisition station 40b, and a back soldering tape 2 for forming the third unit of the battery string is placed above the back film 1 located at the third acquisition station 40c. The placed top soldering tape 4 and back soldering tape 2 are integrally formed, so the top soldering tape 4 and back soldering tape 2 need to be placed at the same time. The sample image of the top soldering tape 4 located at the second acquisition station 40b is acquired by the first image acquisition device 20, and the sample image of the back soldering tape 2 located at the third acquisition station 40c is acquired by the second image acquisition device 30.

[0130] Please refer to Fig.14 As shown, a top film 5 for forming the second unit of the battery string is placed above the top welding tape 4 located at the second acquisition station 40b, and a battery cell 3 for forming the third unit of the battery string is placed above the back welding tape 2 located at the third acquisition station 40c. The sample image of the top film 5 located at the second acquisition station 40b is acquired by the first image acquisition device 20, and the sample image of the battery cell 3 located at the third acquisition station 40c is acquired by the second image acquisition device 30.

[0131] Please refer to Fig.15 As shown, the back film 1 for forming the fourth unit of the battery string is placed at the fourth acquisition station 40d, and the conveyor belt 40 drives the carried parts to shift along the direction X, so that the first image collector 20 corresponds to the third acquisition station 40c, and the second image collector 30 corresponds to the fourth acquisition station 40d, and the second image collector 30 is used to collect the sample image of the back film 1 located at the fourth acquisition station 40d.

[0132] Please refer to Fig.16As shown, a top welding tape 4 for forming the third unit of the battery string is placed above the battery cell 3 located at the third acquisition station 40c, and a back welding tape 2 for forming the fourth unit of the battery string is placed above the back film 1 located at the fourth acquisition station 40d. The placed top welding tape 4 and back welding tape 2 are integrally formed, so the top welding tape 4 and back welding tape 2 need to be placed at the same time. The sample image of the top welding tape 4 located at the third acquisition station 40c is acquired by the first image acquisition device 20, and the sample image of the back welding tape 2 located at the fourth acquisition station 40d is acquired by the second image acquisition device 30.

[0133] Please refer to Fig.17 As shown, a top covering film 5 for forming the third unit of the battery string is placed above the top welding tape 4 located at the third acquisition station 40c, and a battery cell 3 for forming the fourth unit of the battery string is placed above the back welding tape 2 located at the fourth acquisition station 40d. The first image acquisition device 20 is used to acquire a sample image of the top covering film 5 located at the third acquisition station 40c, and the second image acquisition device 30 is used to acquire a sample image of the battery cell 3 located at the fourth acquisition station 40d.

[0134] Please refer to Fig.18 As shown, a top soldering tape 4 for forming the fourth unit of the battery string is placed above the battery cell 3 located at the fourth acquisition station 40d, and a sample image of the top soldering tape 4 located at the fourth acquisition station 40d is acquired by the second image acquisition device 30.

[0135] Please refer to Fig.19 As shown, a top covering film 5 for forming the fourth unit of the battery string is placed above the top welding tape 4 located at the fourth acquisition station 40d, and a sample image of the top covering film 5 located at the fourth acquisition station 40d is acquired by the second image acquisition device 30.

[0136] When the analysis result after the last image acquisition is that the position error is within the allowable error value range, such as Fig.19 The conveyor belt 40 shown delivers the pre-assembled battery string to a pressing device to connect the cover film and the battery sheet.

[0137] If the analysis result after any of the above image acquisitions is that the position error is outside the allowable error value range, the subsequent pre-assembly operation and image acquisition are stopped, and the conveyor belt 40 will send the carried battery string parts to the recycling position.

[0138] The process described above is described by taking a battery string including four cells as an example. If the battery string includes other numbers of cells, the process described above can be used for analogical reasoning.

[0139] Although the pre-assembly process of two adjacent units of a battery string is restricted by the integrally formed solder strips (back solder strip 2 and top solder strip 4), there can be many variations in the process of placing the back film 1, the process of placing the battery cell 3, and the process of placing the top film 5 during the pre-assembly process of two adjacent units of the battery string. Therefore, the image acquisition process is not limited to the process described above.

[0140] For example, the corresponding back film 1 can be placed simultaneously or successively at the first acquisition station 40a and the second acquisition station 40b, and then the first image acquisition device 20 is used to acquire the sample image of the back film 1 located at the first acquisition station 40a, and the second image acquisition device 30 is used to acquire the sample image of the back film 1 located at the second acquisition station 40b. Figure 5 The status shown jumps directly to Figure 7 Status shown.

[0141] For example, the corresponding back film 1 can be placed at the first acquisition station 40a, and the sample image of the back film 1 located at the first acquisition station 40a can be acquired by using the first image acquisition device 20; then the back soldering tape 2 can be placed on the back film 1 located at the first acquisition station 40a, and the sample image of the back soldering tape 2 located at the first acquisition station 40a can be acquired by using the first image acquisition device 20; then the battery cell 3 can be placed above the back soldering tape 2 located at the first acquisition station 40a, and the sample image of the battery cell 3 located at the first acquisition station 40a can be acquired by using the first image acquisition device 20. Accordingly, the variation process of this embodiment is as follows: Figure 5 The states shown in the figure jump to the following Figure 6 The status shown, such as Fig. 20 The status shown, such as Fig.21 The state shown. Fig.10 Before placing the top welding tape 4 on the top of the battery cell 3 located at the first acquisition station 40a, the back cover film 1 can be placed at the second acquisition station 40b at any time, and the sample image of the back cover film 1 located at the second acquisition station 40b can be acquired by the second image acquisition device 30, that is, when the top welding tape 4 is placed ... at the first acquisition station 40a, the back cover film 1 can be placed at the second acquisition station 40b, and the sample image of the back cover film 1 located at the second acquisition station 40b can be acquired by the second image acquisition device 30 Fig.10 The state shown was previously achieved as Fig. 9 Status shown.

[0142] Similarly, in Fig.13 As shown, before placing the top welding tape 4 above the battery cell 3 at the second collection station 40b, the corresponding back film 1 can be placed at the third collection station 40c at any time. Fig.12 As shown, after the second image collector 30 moves from the second collecting station 40b to the third collecting station 40c, the second image collector 30 can collect the back film 1 located at the third collecting station 40c. Fig.16As shown, before placing the top welding tape 4 above the battery cell 3 at the third collection station 40c, the corresponding back cover film 1 can be placed at the fourth collection station 40d at any time. Fig.15 As shown, after the second image collector 30 moves from the third collecting station 40c to the fourth collecting station 40d, the second image collector 30 can collect the back film 1 located at the fourth collecting station 40d.

[0143] For example, a top cover film 5 may be placed above the top solder tape 4 at the first acquisition station 40a, and a sample image of the top cover film 5 at the first acquisition station 40a may be acquired by using the first image acquisition device 20; then a battery cell 3 may be placed above the back solder tape 2 at the second acquisition station 40b, and a sample image of the battery cell 3 at the second acquisition station 40b may be acquired by using the second image acquisition device 30. Accordingly, the variation process of this embodiment may be as follows: Fig.10 The status shown jumps to Fig. 22 The state shown in the figure, then jump to Fig.11 In the changing process, the first image collector 20 is always aligned with the top film 5 located at the first acquisition station 40a. Therefore, when the second image collector 30 acquires the sample image of the battery cell 3 located at the second acquisition station 40b, the first image collector 20 can acquire the sample image of the top film 5 located at the first acquisition station 40a again, so that the computer can detect whether the top film 5 located at the first acquisition station 40a is affected (for example, vibrated) when the battery cell 3 is placed at the second acquisition station 40b, resulting in the displacement of the position of the top film 5 located at the first acquisition station 40a.

[0144] The above-mentioned actions of placing the parts of the battery string are all performed by the automatic transfer device. If the indicator is to reduce the action process of the automatic transfer device, it can be set that after each part of the battery string is placed, the image collector is used to collect a sample image of the target object (i.e., the part just placed), and the computer controls the automatic transfer device to place the next part to be placed based on the analysis results of the sample image. If the indicator is to improve production efficiency, two automatic transfer devices can be used to place the corresponding parts at their respective corresponding collection stations, and the two corresponding image collectors collect the sample images of the corresponding target objects. The computer analyzes the results of the two sample images at the same time, and the computer controls the two automatic transfer devices to continue to place the subsequent parts to be placed based on the analysis results of the two sample images. Therefore, the image acquisition method described in the above content can be adjusted according to different indicators.

[0145] The embodiment of the present application does not limit the number of image collectors used, and three or more image collectors may be used. For example, the first image collector 20 is first aligned with the first acquisition station 40a, the second image collector 30 is aligned with the second acquisition station 40b, and the third image collector (not shown in the figure) is aligned with the third acquisition station 40c. Before the third acquisition station 40c moves into the acquisition range of the second image collector 30, the back cover film 1 can be placed in advance at the third acquisition station 40c, and the sample image of the back cover film 1 located at the third acquisition station 40c can be collected in advance by using the third image collector. After the conveyor belt 40 moves along the direction X so that the back cover film 1 located at the third acquisition station 40c moves into the acquisition range of the second image collector 30, the back welding tape 2 can be placed directly above the back cover film 1 located at the third acquisition station 40c, and the sample image of the back welding tape 2 located at the third acquisition station 40c can be collected by using the second image collector 30, so as to save time and improve efficiency.

[0146] The embodiment of the present application does not limit the number of battery strings to be produced, and at least two battery strings can be continuously produced on the conveyor belt 40. Fig.17 As shown, after the first image collector 20 is used to collect the sample image of the top cover film 5 located at the third collection station 40c and the second image collector 30 is used to collect the sample image of the battery cell 3 located at the fourth collection station 40d, the fourth collection station 40d of the conveyor belt 40 is moved to the collection range of the first image collector 20, and accordingly, the fifth collection station (not shown in the figure) of the conveyor belt 40 is moved to the collection range of the second image collector 30. Then, the top welding tape 4 is placed above the battery cell 3 located at the fourth collection station 40d, and the back cover film 1 for forming the first unit of a new battery string is placed at the fifth collection station, and the sample image of the top welding tape 4 located at the fourth collection station 40d is collected by the first image collector 20, and the sample image of the back cover film 1 located at the fifth collection station is collected by the second image collector 30. Next, a top film 5 is placed above the top welding tape 4 at the fourth acquisition station 40d, and a back welding tape 2 is placed above the back film 1 at the fifth acquisition station. The sample image of the top film 5 at the fourth acquisition station 40d is acquired by the first image acquisition device 20, and the sample image of the back welding tape 2 at the fifth acquisition station is acquired by the second image acquisition device 30. Then, the conveyor belt 40 is moved along the direction X so that the fifth acquisition station moves to the acquisition range of the first image acquisition device 20, and the sixth acquisition station (not shown in the figure) of the conveyor belt 40 moves to the acquisition range of the second image acquisition device 30. By analogy, the image acquisition method of the embodiment of the present application can continuously acquire sample images of parts of at least two battery strings.

[0147] In the process of pre-assembly of the battery string, the relative importance of the position accuracy of the back soldering tape 2, the position accuracy of the battery cell 3 and the position accuracy of the top soldering tape 4 is relatively high. The position accuracy of these three directly affects the electrical connection contact area between the soldering tape and the battery cell, thereby affecting the reliability of the electrical connection. Therefore, the above-mentioned image acquisition process can only acquire sample images for the back soldering tape 2, the battery cell 3 and the top soldering tape 4, thereby improving efficiency.

[0148] The image acquisition processes of various embodiments described above all have the following rules:

[0149] At least two image collectors are used to cooperate and successively collect sample images of target objects (parts of a battery string) carried by at least two adjacent collection stations. The same collection station is sequentially collected by at least two image collectors. Sample images are collected by the same collection station in sequence, and the target objects carried by the same collection station are different when corresponding to different image collectors, that is, the target objects to be collected by the same image collector when corresponding to different collection stations are different. In short, the image collection process described above is carried out along with the pre-assembly process of the battery string.

[0150] The prior art usually detects the quality of the battery string after completing the pre-assembly process and the pre-pressing process. That is, the prior art cannot promptly detect whether there is an offset problem in the position of any assembled parts during the pre-assembly process of the battery string. That is, the prior art easily leads to a large amount of production time being consumed in the process of producing problematic battery strings. Correspondingly, the number of qualified battery strings produced per unit time is low, resulting in low production efficiency of qualified photovoltaic modules.

[0151] The image acquisition method provided in the embodiment of the present application can timely acquire sample images of any assembled parts during the pre-assembly of battery strings. The sample images are used by a computer to analyze whether there is an offset problem in the position of the currently assembled parts, thereby reducing the production time consumed in the process of producing problematic battery strings, and correspondingly increasing the number of qualified battery strings produced per unit time, thereby improving the production efficiency of qualified photovoltaic modules.

[0152] Furthermore, each image collector corresponds to a separate collection station when collecting sample images. This setting enables each image collector to collect more image details of the target object located at the corresponding collection station, so that the subsequent computer can accurately calculate the position error of the target object.

[0153] Optionally, step S1 includes step S11, and step S11 includes:

[0154] Step S111: using the first image collector to collect a sample image of the back film at the corresponding collection station. For example, referring to FIG6 , using the first image collector 20 to collect a sample image of the back film 1 at the first collection station 40a.

[0155] Step S112: Use the first image collector to collect a sample image of the back solder strip located at the corresponding collection station and above the back cover film. For example, please refer to Figure 8 As shown, the first image collector 20 is used to collect a sample image of the back solder tape 2 located at the first collection station 40 a and above the back cover film 1 .

[0156] Step S113: Use the first image collector to collect a sample image of the cell located at the corresponding collection station and above the back solder strip. For example, please refer to Fig. 9 As shown, the first image collector 20 is used to collect a sample image of the battery cell 3 located at the first collection station 40a and above the back soldering tape 2.

[0157] Step S114: Use the first image collector to collect a sample image of the top solder strip located at the corresponding collection station and above the battery cell. For example, please refer to Fig.10 As shown, the first image collector 20 is used to collect a sample image of the top soldering tape 4 located at the first collection station 40 a and above the battery cell 3 .

[0158] Step S115: Use the first image collector to collect a sample image of the top film located at the corresponding collection station and above the top welding strip. For example, please refer to Fig.11 As shown, the first image collector 20 is used to collect a sample image of the top covering film 5 located at the first collection station 40 a and above the top welding tape 4 .

[0159] The image acquisition method of this embodiment can timely acquire sample images of any parts included in the first unit during the pre-assembly process of the first unit of the battery string. The sample images are used by the computer to analyze whether there is an offset problem in the position of the currently assembled parts, so as to reduce the production time consumed in the process of assembling the first unit with problems, and to facilitate the producer to promptly troubleshoot problems with the production line.

[0160] Optionally, step S1 includes step S12, and step S12 includes:

[0161] Step S121: using a first image collector to collect a sample image of a top soldering tape located at a corresponding collection station and above a battery cell.

[0162] Step S122: using a first image collector to collect a sample image of the top covering film located at a corresponding collection station and above the top welding tape.

[0163] For example, see Fig.13 As shown, the first image collector 20 is used to collect a sample image of the top soldering tape 4 located at the second collection station 40b and above the battery cell 3. Fig.14 As shown, the first image collector 20 is used to collect a sample image of the top covering film 5 located at the second collection station 40 b and above the top welding tape 4 .

[0164] For example, see Fig.16 As shown, the first image collector 20 is used to collect a sample image of the top soldering tape 4 located at the third collection station 40c and above the battery cell 3. Fig.17 As shown, the first image collector 20 is used to collect a sample image of the top covering film 5 located at the third collection station 40 c and above the top welding tape 4 .

[0165] In other embodiments, the first image collector 20 can collect sample images of the top welding tape 4 located at other collection stations and located above the battery cell 3, and the first image collector 20 can collect sample images of the top covering film 5 located at other collection stations and located above the top welding tape 4.

[0166] The image acquisition method of this embodiment can timely acquire sample images of some parts included in the non-first unit during the pre-assembly process of the non-first unit of the battery string. The sample images are used by the computer to analyze whether there is an offset problem in the position of the currently assembled parts, so as to reduce the production time consumed in the process of assembling the non-first unit with problems, and to facilitate the producer to promptly troubleshoot problems with the production line.

[0167] Optionally, if step S1 includes step S11 and step S12 described above, step S12 may be performed after step S11 is performed. For example, step S11 is performed for the first cell of the battery string, and then step S12 is performed for the second cell of the battery string.

[0168] Optionally, step S2 includes step S21, and step S21 includes:

[0169] Step S211: using a second image collector to collect a sample image of the back film located at a corresponding collection station.

[0170] Step S212: using a second image collector to collect a sample image of the back solder tape located at a corresponding collection station and above the back cover film.

[0171] Step S213: using a second image collector to collect a sample image of the battery cell located at a corresponding collection station and above the back solder strip.

[0172] For example, please refer to FIG9 , and use the second image collector 30 to collect the sample image of the back film 1 located at the second collection station 40b. Fig.10 As shown, the second image collector 30 is used to collect a sample image of the back soldering tape 2 located at the second collection station 40b and above the back cover film 1. Fig.11 As shown, the second image collector 30 is used to collect a sample image of the battery cell 3 located at the second collection station 40 b and above the back soldering tape 2 .

[0173] For example, see Fig.12 As shown, the second image collector 30 is used to collect the sample image of the back film 1 located at the third collection station 40c. Fig.13 As shown, the second image collector 30 is used to collect a sample image of the back soldering tape 2 located at the third collection station 40c and above the back cover film 1. Fig.14 As shown, the second image collector 30 is used to collect a sample image of the battery cell 3 located at the third collection station 40c and above the back soldering tape 2.

[0174] In other embodiments, the second image collector 30 may also collect sample images of the back film 1 located at other collection stations, the second image collector 30 may also collect sample images of the back soldering strip 2 located at other collection stations and located above the back film 1, and the second image collector 30 may also collect sample images of the battery cell 3 located at other collection stations and located above the back soldering strip 2.

[0175] The image acquisition method of this embodiment can timely acquire sample images of some parts included in the non-first unit during the pre-assembly process of the non-first unit of the battery string. The sample images are used by the computer to analyze whether there is an offset problem in the currently assembled parts, so as to reduce the production time consumed in the process of assembling the non-first unit with problems, and to facilitate the producer to promptly troubleshoot problems with the production line.

[0176] Optionally, step S2 includes step S22, and step S22 includes:

[0177] Step S221: using a second image collector to collect a sample image of the back film located at a corresponding collection station.

[0178] Step S222: using a second image collector to collect a sample image of the back solder tape located at a corresponding collection station and above the back cover film.

[0179] Step S223: using a second image collector to collect a sample image of the battery cell located at a corresponding collection station and above the back solder strip.

[0180] Step S224: using a second image collector to collect a sample image of the top solder strip located at a corresponding collection station and above the battery cell.

[0181] Step S225: using a second image collector to collect a sample image of the top covering film located at a corresponding collection station and above the top welding tape.

[0182] For example, see Fig.15 As shown, the second image collector 30 is used to collect the sample image of the back film 1 located at the fourth collection station 40d. Fig.16 As shown, the second image collector 30 is used to collect a sample image of the back soldering tape 2 located at the fourth collection station 40d and above the back cover film 1. Fig.17 As shown, the second image collector 30 is used to collect a sample image of the battery cell 3 located at the fourth collection station 40d and above the back soldering tape 2. Fig.18 As shown, the second image collector 30 is used to collect a sample image of the top welding strip 4 located at the fourth collection station 40d and above the battery cell 3. Fig.19 As shown, the second image collector 30 is used to collect a sample image of the top covering film 5 located at the fourth collecting station 40 d and above the top welding tape 4 .

[0183] The image acquisition method of this embodiment can timely acquire sample images of any parts included in the last unit of each battery string during the pre-assembly process of the unit. The sample images are used by the computer to analyze whether there is an offset problem in the position of the currently assembled parts, so as to reduce the production time consumed in the process of assembling the problematic units and facilitate the producer to promptly troubleshoot production line problems.

[0184] Wherein, step S22 may be performed after step S21. For example, step S21 is performed for the second to last cell of the battery string, and then step S22 is performed for the last cell of the battery string.

[0185] Optionally, step S1 includes step S13: using a first image collector to collect a sample image of a top covering film located at a corresponding collection station and located above a top welding tape. Step S2 includes step S23: using a second image collector to collect a sample image of a battery cell located at a corresponding collection station and located above a back welding tape. The image collection method of an embodiment of the present application also includes step S0: after executing steps S13 and S23, the collection station collected by the first image collector in step S13 is moved out of the collection range of the first image collector, the collection station collected by the second image collector in step S23 is moved into the collection range of the first image collector, and the collection station not collected by the second image collector is moved into the collection range of the second image collector.

[0186] For example, see Fig.11 As shown, the first image collector 20 is used to collect a sample image of the top cover film 5 located at the first collection station 40a and above the top soldering tape 4, and the second image collector 30 is used to collect a sample image of the battery cell 3 located at the second collection station 40b and above the back soldering tape 2. After collecting these two sample images, as shown in FIG. Fig.12 As shown, the first acquisition station 40a is moved out of the acquisition range of the first image collector 20, the second acquisition station 40b is moved into the acquisition range of the first image collector 20, and the third acquisition station 40c is moved into the acquisition range of the second image collector 30. This facilitates the subsequent use of the second image collector 30 to acquire a sample image of the back film 1 located at the third acquisition station 40c.

[0187] For example, see Fig.14 As shown, the first image collector 20 is used to collect a sample image of the top cover film 5 located at the second collection station 40b and above the top soldering tape 4, and the second image collector 30 is used to collect a sample image of the battery cell 3 located at the third collection station 40c and above the back soldering tape 2. After collecting these two sample images, as shown in FIG. Fig.15 As shown, the second acquisition station 40b is moved out of the acquisition range of the first image collector 20, the third acquisition station 40c is moved into the acquisition range of the first image collector 20, and the fourth acquisition station 40d is moved into the acquisition range of the second image collector 30. This facilitates the subsequent use of the second image collector 30 to acquire a sample image of the back film 1 located at the fourth acquisition station 40d.

[0188] By analogy, after using the first image collector 20 to collect sample images of the top covering film 5 located at other collection stations and using the second image collector 30 to collect sample images of the battery cells 3 located at other collection stations, the first image collector 20 and the second image collector 30 can be moved to their respective corresponding next collection stations for the images to be collected.

[0189] The operation of this embodiment is to utilize the conveyor belt 40 to move along the direction X, so as to drive each acquisition station and the parts carried thereon to move along the direction X relative to the image acquisition device.

[0190] In other embodiments, the conveyor belt 40 may be replaced with a fixed stage, and the image collector may be moved relative to the stage in the direction opposite to the direction X. For example, after executing step S13 and step S23, step S0 is executed: the second image collector is moved so that the acquisition station not acquired by the second image collector is located within the acquisition range of the moved second image collector, and the first image collector is moved so that the acquisition station acquired by the second image collector in step S23 is located within the acquisition range of the moved first image collector.

[0191] Optionally, the image acquisition method of the embodiment of the present application can also be applied to the acquisition of images of other structural parts with a stacked structure, for example, a laminate with a stacked structure. The parts carried by the conveyor belt 40 can be the top photovoltaic glass 9 of the laminate, the top adhesive film 7 of the laminate, the battery string of the laminate (qualified and pre-pressed), the back adhesive film 6 of the laminate, and the back photovoltaic glass 8 of the laminate. Each acquisition station of the conveyor belt 40 can be placed corresponding to the pre-assembled laminate. Each image collector can successively acquire sample images of the target object corresponding to at least two adjacent acquisition stations, the target object being the top photovoltaic glass 9, the top adhesive film 7, the battery string (qualified and pre-pressed), the back adhesive film 6 and the back photovoltaic glass 8. The sample images acquired are used to be acquired by the computer and calculated to calculate the position error amount about the target object, so as to facilitate timely discovery of whether the currently pre-assembled laminate has a position offset problem, thereby reducing the production time consumed in the process of assembling the problem laminate, and facilitating the producer to timely troubleshoot the problem of the production line.

[0192] The embodiment of the present application does not specifically limit the type of image collector, and the image collector only needs to have the function of taking images.

[0193] The first image collector 20 and the second image collector 30 may both be independent image collectors. The first image collector 20 and the second image collector 30 may be respectively connected to a computer for data transmission so that the computer can obtain the collected sample images.

[0194] Of course, the first image collector 20 and the second image collector 30 can both belong to sub-modules of the same image acquisition device. In other words, the first image collector 20 can serve as the first optical-mechanical component of the image acquisition device, and the second image collector 30 can serve as the second optical-mechanical component of the same image acquisition device. The image acquisition device is data-connected to a computer so that the computer can obtain the acquired sample images.

[0195] The following content of this article introduces the position error detection method, which includes:

[0196] Step A: Using a computer to obtain a sample image of the target object from an image collector.

[0197] Step B: Calculate the position error of the target object based on the sample image using a computer.

[0198] The sample image is obtained by using the image acquisition method described above, and the target object is a back cover film, a back solder tape, a battery cell, a top solder tape or a top cover film.

[0199] The purpose of the position error amount and the technical effects brought about by the position error detection method have been described above and will not be repeated here.

[0200] In addition, the principle of the computer calculating the position error amount of the target object based on the sample image can refer to the existing image recognition technology. In short, the sample image includes a plurality of pixels, each pixel has a coordinate in the sample image, and the brightness value (RGB value) of each pixel is different. The computer can identify the brightness value corresponding to each coordinate, and the computer can select the brightness value corresponding to some coordinates and compare it with the preset value (value related to the reference object) stored in the computer. If the brightness value is close to or the same as the preset value, the computer can determine that the target object corresponding to the coordinate is the reference object recorded by the computer. For example, if the brightness value of the pixel in the upper left corner of the sample image is close to or the same as the preset value (value related to the coating) stored in the computer, the computer can determine that the target object in the upper left corner of the sample image is the coating; similarly, if the brightness value of the pixel in the middle area of ​​the sample image is close to or the same as the preset value (value related to the welding strip) stored in the computer, the computer can determine that the target object in the middle area of ​​the sample image is the welding strip. In summary, the computer can identify the target object and the corresponding coordinates. The computer can obtain the position error of the target object by comparing the position coordinates of the target object with the reference coordinates.

[0201] Optionally, step B includes:

[0202] Step B1: Using a computer to identify the detection reference and target object in the sample image.

[0203] Step B2: Calculate sample geometric dimensions between the detection reference and the target object using a computer, wherein the sample geometric dimensions include sample distance dimensions and / or sample angle dimensions.

[0204] Step B3: Calculate the difference between the reference dimension and the sample geometric dimension using a computer, and output the difference as a position error amount.

[0205] In the process of collecting sample images, in addition to collecting the target object, the detection reference (such as the mark on the conveyor belt, the edge of the part, and the end of the part) is also collected. The computer can identify the coordinates of the target object in the sample image and the coordinates of the detection reference, and calculate the sample geometric dimensions (sample distance dimensions and / or sample angle dimensions) between the coordinates of the target object and the coordinates of the detection reference. For example, the sample distance dimension between the target object and the detection reference in direction X, the sample distance dimension between the target object and the detection reference in direction Z, and the sample angle dimension between the target object and the detection reference. The computer compares the sample distance dimension with the reference distance dimension, and compares the sample angle dimension with the reference angle dimension to obtain the distance difference and the angle difference, and then outputs the distance difference and the angle difference as the position error amount about the target object.

[0206] Optionally, step B1 includes:

[0207] When the target object is a back film, step B11 is executed: using a computer to identify the detection reference located at the acquisition station and the edge of the back film. Fig.23 As shown, the collection station of the conveyor belt 40 has a reference line 401 and a reference point 402 as a detection reference, and the reference line 401 and the reference point 402 can be formed by printing or pasting. Fig.23 As shown, the back film 1 has a first edge 11. In the process of collecting the sample image, the reference line 401, the reference point 402 and the first edge 11 are all collected into the sample image. The computer recognizes the reference line 401, the reference point 402 and the first edge 11 according to the sample image, and on this basis, the computer can calculate the sample distance dimension and the sample angle dimension between the first edge 11 and the reference line 401, and calculate the sample distance dimension between the first edge 11 and the reference point 402.

[0208] The embodiment of the present application does not limit the specific number of the reference lines 401 and their specific positions on the conveyor belt 40 , nor does it specifically limit the number of the reference points 402 and their specific positions on the conveyor belt 40 .

[0209] In addition, one of the reference line 401 and the reference point 402 may be used as a detection reference.

[0210] When the target object is a back solder strip located above the back cover film, step B12 is performed: using a computer to identify the detection reference located at the acquisition station, the edge of the back cover film, the edge of the back solder strip, and the end of the back solder strip. Fig.24 As shown, at least one of the reference line 401 and the reference point 402 of the conveyor belt 40 is used as a detection reference, and the first edge 11 of the back cover film 1 is also used as a detection reference. Fig.24As shown, the back solder strip 2 has a second edge 21 and a first end 22. In the process of collecting the sample image, the reference line 401, the reference point 402, the first edge 11, the second edge 21 and the first end 22 are all collected into the sample image. The computer recognizes the reference line 401, the reference point 402, the first edge 11, the second edge 21 and the first end 22 according to the sample image, and on this basis, the computer can calculate the sample geometric dimensions between the second edge 21 and the detection reference, and calculate the sample geometric dimensions between the first end 22 and the detection reference.

[0211] When the target object is a cell located above the back solder strip, step B13 is executed: using a computer to identify the detection reference located at the acquisition station and the edge of the cell. Fig.25 As shown, at least one of the reference line 401 and the reference point 402 of the conveyor belt 40 is used as a detection reference. Fig.24 As shown, the cell 3 has a third edge 31. In the process of collecting the sample image, the reference line 401, the reference point 402 and the third edge 31 are all collected into the sample image. The computer recognizes the reference line 401, the reference point 402 and the third edge 31 according to the sample image, and on this basis, the computer can calculate the sample geometric size between the third edge 31 and the detection reference.

[0212] When the target object is a top solder strip located above the battery cell, step B14 is performed: using a computer to identify the edge of the battery cell, the edge of the top solder strip, and the end of the top solder strip. Fig.26 As shown, at least one of the reference line 401 and the reference point 402 of the conveyor belt 40 is used as a detection reference, and the third edge 31 of the battery cell 3 is also used as a detection reference. Fig.24 As shown, the top welding strip 4 has a fourth edge 41 and a second end 42. In the process of collecting the sample image, the reference line 401, the reference point 402, the third edge 31, the fourth edge 41 and the second end 42 are all collected into the sample image. The computer recognizes the reference line 401, the reference point 402, the third edge 31, the fourth edge 41 and the second end 42 according to the sample image, and on this basis, the computer can calculate the sample geometric dimensions between the fourth edge 41 and the detection reference, and calculate the sample geometric dimensions between the second end 42 and the detection reference.

[0213] When the target object is a top film located above the battery cell and the top soldering tape, step B15 is performed: using a computer to identify the edge of the battery cell and the edge of the top film. Fig. 27As shown, the third edge 31 of the battery cell 3 can be used as a detection reference, and the top cover film 5 has a fifth edge 51. In the process of collecting the sample image, the third edge 31 and the fifth edge 51 are both collected in the sample image. The computer identifies the third edge 31 and the fifth edge 51 according to the sample image, and on this basis, the computer can calculate the sample geometric dimensions between the fifth edge 51 and the detection reference. Of course, the reference line 401 and the reference point 402 can also be collected in the sample image and identified by the computer as a detection reference.

[0214] In the above embodiment, the reference lines 401 and reference points 402 of each collection station of the conveyor belt 40 and the geometric features of the parts of the placed battery string are used as the detection references of the sample image, which are all the references for real-time collection. Using the references for implementation of collection as the detection reference makes the position error amount calculated by the computer about the target object more accurate. In particular, the geometric features of the parts placed first in the battery string are used as the detection references of other parts placed later, which is also conducive to improving the accuracy of the position error amount calculated by the computer about the target object.

[0215] Since there are a large number of detection benchmarks in some of the above steps, the computer can prioritize the detection benchmarks used in each of the above steps, such as using the geometric features of the parts of the battery string placed first as the priority detection benchmark, or using the benchmark line 401 as the priority detection benchmark, or using the benchmark point 402 as the priority detection benchmark.

[0216] In other embodiments, step B may also include:

[0217] Step B4: using a computer to identify a sample position of a target object in the sample image;

[0218] Step B5: Calculate the geometric dimensions between the reference position of the reference object and the sample position in the reference image using a computer, and output the geometric dimensions as position error quantities, wherein the geometric dimensions include distance dimensions and / or angle dimensions.

[0219] Among them, the reference image is an image of the parts of the battery string located in the standard position that is pre-collected by the image collector. The computer can identify the standard position of the parts of the battery string in the reference image, and the computer can store the reference image and information about the reference image (such as standard position information of the parts). For example, the same unit of the battery string includes five parts, so the computer can pre-store reference images and related information about these five parts located in the standard position. During the detection process, the computer can identify the type of target object and the sample position based on the sample image, and the computer accordingly retrieves the reference image and reference position of the same type of parts. The computer obtains the position error amount of the target object by comparing the sample position and the reference position.

[0220] Optionally, the position error detection method of the embodiment of the present application can also be applied to detect the position error of other structural parts with a stacked structure, for example, a laminate with a stacked structure. The parts carried by the conveyor belt 40 can be the top photovoltaic glass 9 of the laminate, the top adhesive film 7 of the laminate, the battery string of the laminate (qualified and pre-pressed), the back adhesive film 6 of the laminate, and the back photovoltaic glass 8 of the laminate. Each collection station of the conveyor belt 40 can be placed in correspondence with the pre-assembled laminate. Each image collector can collect sample images of the target object being the top photovoltaic glass 9, the sample image of the top adhesive film 7, the sample image of the battery string (qualified and pre-pressed), the sample image of the back adhesive film 6, and the sample image of the back photovoltaic glass 8, respectively. The collected sample images are used to be acquired by the computer and calculated to calculate the position error amount about the target object, so as to facilitate timely discovery of whether the currently pre-assembled laminate has a position offset problem, thereby reducing the production time consumed in the process of assembling the problem laminate, and facilitating the producer to timely troubleshoot the problem of the production line.

[0221] The following content of this article introduces the assembly process control method, which includes:

[0222] Step α: Using a computer to obtain the position error amount of the target object, the position error amount is obtained according to the position error detection method described above.

[0223] Step β: using a computer to compare the size relationship between the position error amount and the lower limit of the allowable error value range, and using a computer to compare the size relationship between the position error amount and the upper limit of the allowable error value range.

[0224] When the position error is greater than the lower limit and the position error is less than the upper limit, step γ is executed, and step γ includes:

[0225] If the current battery string has not been pre-assembled, continue to assemble the parts of the current battery string;

[0226] If the current battery string has been pre-assembled, the operation of pressing the pre-assembled battery string is performed;

[0227] When the position error is less than the lower limit, or when the position error is greater than the upper limit, step θ is executed, and step θ includes:

[0228] The pre-assembly process of the battery string is suspended, that is, the automatic transfer device is suspended to carry the next part to be assembled, the image acquisition process is suspended, and the position error detection process is suspended.

[0229] The technical effects brought about by the assembly process control method have been described above and will not be repeated here.

[0230] Optionally, the assembly process control method of the embodiment of the present application can also be applied to control the preassembly process of other structural parts with a stacked structure, for example, a laminate with a stacked structure. The parts carried by the conveyor belt 40 can be the top photovoltaic glass 9 of the laminate, the top adhesive film 7 of the laminate, the battery string of the laminate (qualified and pre-pressed), the back adhesive film 6 of the laminate, and the back photovoltaic glass 8 of the laminate. Each collection station of the conveyor belt 40 can be placed in correspondence with the preassembled laminate. Each image collector can collect sample images of the target object being the top photovoltaic glass 9, the sample image of the top adhesive film 7, the sample image of the battery string (qualified and pre-pressed), the sample image of the back adhesive film 6, and the sample image of the back photovoltaic glass 8, respectively. The collected sample images are used to be acquired by the computer and calculated to calculate the position error amount about the target object, so as to facilitate timely discovery of whether the current preassembled laminate has a position offset problem, thereby reducing the production time consumed in the process of assembling the problem laminate, and facilitating the producer to timely troubleshoot the problem of the production line.

[0231] It should be noted that the type of the cell 3 described in the above embodiments may be: a photovoltaic cell in which the positive electrode is located on one side of the cell 3 and the negative electrode is located on the other side of the cell 3, that is, the positive electrode and the negative electrode are arranged opposite to each other in the thickness direction of the cell 3. For example, the cell 3 may be a heterojunction cell (HIT), a passivated emitter rear cell (PERC), a tunnel oxide passivated contact cell (TOPCON) or a perovskite cell (PSC).

[0232] Of course, the method provided in the embodiment of the present application can also be applied to back contact batteries (Back Contact, BC), that is, the positive electrode and the negative electrode are both located on the same side surface of the battery cell. Accordingly, the target objects and the sequence to be identified in each step included in step S11 described in the above content need to be adaptively adjusted. Similarly, the target objects and the sequence to be identified in each step included in step S12 also need to be adaptively adjusted. The target objects and the sequence to be identified in each step included in step S21 also need to be adaptively adjusted. The target objects and the sequence to be identified in each step included in step S22 also need to be adaptively adjusted. In short, the method of the embodiment including step S1 and step S2 is still applicable to back contact batteries (Back Contact, BC).

[0233] The type of the cell 3 described in the above embodiments can be a busbar photovoltaic cell (for example, a two-busbar photovoltaic cell, a three-busbar photovoltaic cell, a four-busbar photovoltaic cell, a five-busbar photovoltaic cell or a multi-busbar photovoltaic cell) or a busbarless photovoltaic cell (also known as an OBB photovoltaic cell).

[0234] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module image acquisition method, characterized in that: The image acquisition method comprises: Step S1: using a first image collector to successively collect sample images of a target object corresponding to at least two adjacent collection stations; Step S2: using a second image collector to successively collect sample images of the target object corresponding to at least two adjacent collection stations; The acquisition station corresponding to the first image collector is adjacent to the acquisition station corresponding to the second image collector, and the acquisition station currently corresponding to the second image collector is the acquisition station to be subsequently corresponding to by the first image collector; The target object whose sample image is collected by the first image collector or the second image collector at a single time is a back film of a photovoltaic module, a back welding strip of a photovoltaic module, a cell of a photovoltaic module, a top welding strip of a photovoltaic module, or a top film of a photovoltaic module; The sample image is used to be acquired by a computer and the position error amount of the target object is calculated.

2. The photovoltaic assembly image acquisition method according to claim 1, characterized in that: The step S1 includes step S11 and / or step S12: The step S11 comprises: Step S111: using the first image collector to collect a sample image of the back film located at the corresponding collection station; Step S112: using the first image collector to collect a sample image of the back soldering tape located at the corresponding collection station and above the back covering film; Step S113: using the first image collector to collect a sample image of the battery cell located at the corresponding collection station and above the back soldering tape; Step S114: using the first image collector to collect a sample image of the top welding strip located at the corresponding collection station and above the battery cell; Step S115: using the first image collector to collect a sample image of the top covering film located at the corresponding collection station and above the top welding tape; The step S12 comprises: Step S121: using the first image collector to collect a sample image of the top welding strip located at the corresponding collection station and above the battery cell; Step S122: using the first image collector to collect a sample image of the top covering film located at the corresponding collection station and above the top welding tape.

3. The photovoltaic assembly image acquisition method according to claim 2, characterized in that: If the step S1 includes step S11 and step S12, step S12 is performed after step S11 is performed.

4. The photovoltaic assembly image acquisition method according to claim 1, characterized in that: The step S2 includes step S21 and / or step S22: The step S21 comprises: Step S211: using the second image collector to collect a sample image of the back film located at the corresponding collection station; Step S212: using the second image collector to collect a sample image of the back soldering tape located at the corresponding collection station and above the back covering film; Step S213: using the second image collector to collect a sample image of the battery cell located at the corresponding collection station and above the back soldering tape; The step S22 comprises: Step S221: using the second image collector to collect a sample image of the back film located at the corresponding collection station; Step S222: using the second image collector to collect a sample image of the back soldering tape located at the corresponding collection station and above the back covering film; Step S223: using the second image collector to collect a sample image of the battery cell located at the corresponding collection station and above the back soldering tape; Step S224: using the second image collector to collect a sample image of the top solder strip located at the corresponding collection station and above the battery cell; Step S225: using the second image collector to collect a sample image of the top covering film located at the corresponding collection station and above the top welding tape.

5. The photovoltaic assembly image acquisition method according to claim 1, characterized in that: The step S1 includes step S13: using the first image collector to collect a sample image of the top covering film located at the corresponding collection station and above the top welding strip; The step S2 includes step S23: using the second image collector to collect a sample image of the battery cell located at the corresponding collection station and above the back soldering tape; The method further comprises step S0: After executing step S13 and step S23, the acquisition station acquired by the first image acquirer in step S13 is moved out of the acquisition range of the first image acquirer, the acquisition station acquired by the second image acquirer in step S23 is moved into the acquisition range of the first image acquirer, and the acquisition station not acquired by the second image acquirer is moved into the acquisition range of the second image acquirer; or, after executing step S13 and step S23, the second image acquirer is moved so that the acquisition station not acquired by the second image acquirer is located within the acquisition range of the second image acquirer after the move, and the first image acquirer is moved so that the acquisition station acquired by the second image acquirer in step S23 is located within the acquisition range of the first image acquirer after the move.

6. A photovoltaic module position error detection method, characterized in that: The detection method comprises: Step A: using a computer to obtain a sample image of the target object from an image collector; Step B: using the computer to calculate the position error amount of the target object according to the sample image; Wherein, the sample image is obtained according to the photovoltaic module image acquisition method described in any one of claims 1 to 5, and the target object is the back film of the photovoltaic module, the back welding tape of the photovoltaic module, the battery cell of the photovoltaic module, the top welding tape of the photovoltaic module or the top film of the photovoltaic module.

7. The photovoltaic module position error detection method according to claim 6, characterized in that: The step B comprises: Step B1: using the computer to identify the detection reference and the target object in the sample image; Step B2: using the computer to calculate the sample geometric dimensions between the detection reference and the target object, wherein the sample geometric dimensions include sample distance dimensions and / or sample angle dimensions; Step B3: Utilize the computer to calculate the difference between the reference dimension and the geometric dimension of the sample, and output the difference as the position error amount.

8. The photovoltaic module position error detection method according to claim 7, characterized in that: The step B1 comprises: When the target object is a back film, step B11 is performed: using the computer to identify the detection reference located at the collection station and the edge of the back film; When the target object is a back solder strip located above the back cover film, step B12 is performed: using the computer to identify a detection reference located at a collection station, an edge of the back cover film, an edge of the back solder strip, and an end of the back solder strip; When the target object is a cell located above the back solder strip, step B13 is performed: using the computer to identify a detection reference located at a collection station and an edge of the cell; When the target object is a top solder strip located above a battery cell, executing step B14: using the computer to identify an edge of the battery cell, an edge of the top solder strip, and an end of the top solder strip; When the target object is a top covering film located above a battery cell and a top soldering tape, step B15 is performed: using the computer to identify an edge of the battery cell and an edge of the top covering film.

9. The photovoltaic module position error detection method according to claim 6, characterized in that: The step B comprises: Step B4: using the computer to identify a sample position of a target object in the sample image; Step B5: Utilizing the computer to calculate the geometric dimensions between the reference position of the reference object in the reference image and the sample position, and outputting the geometric dimensions as the position error amount, wherein the geometric dimensions include distance dimensions and / or angle dimensions.

10. A photovoltaic module assembly process control method, characterized in that: The control method comprises: Step α: using a computer to obtain a position error value of a target object, wherein the position error value is obtained according to the photovoltaic assembly position error detection method according to any one of claims 6 to 9; Step β: using the computer to compare the size relationship between the position error amount and the lower limit of the allowable error value range, and using the computer to compare the size relationship between the position error amount and the upper limit of the allowable error value range; When the position error is greater than the lower limit and the position error is less than the upper limit, executing step γ: continuing to assemble other parts related to the photovoltaic module, or pressing the assembled parts related to the photovoltaic module; When the position error is less than the lower limit, or when the position error is greater than the upper limit, step θ is executed: pausing the photovoltaic module assembly process.

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