Photovoltaic cell string automatic separation and sorting device and separation and sorting method

Abstract

This invention discloses an automatic photovoltaic (PV) cell string separation and sorting method and an automatic PV cell string separation and sorting device. First, defective PV strings produced by a PV string welding machine are transported to a designated location where flux is sprayed onto them. Then, the solder layer of the solder strip is melted at high temperature, and tooling is used to peel off the solder strip using physical principles, completely separating the cells from the solder strip. Finally, the successfully separated cells undergo visual screening. Defective cells are placed in the NG (non-performing) cell placement area, while good cells are output. The visual screening images are transmitted to a background processor, which sends the judgment instructions to a robotic arm to execute the sorting command, achieving automated separation and sorting, improving the efficiency of string rework, and saving labor costs.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module manufacturing technology, and more specifically, to an automatic separation and sorting equipment and method for photovoltaic cell strings. Background Technology

[0002] In recent years, with the pursuit of high-power, low-cost operating models, the entire industry has entered a phase of power demand exceeding 500W and 600W; multi-busbar, large-size photovoltaic modules have become highly sought after. As the size of the cell busbars increases, the requirements for module manufacturing are becoming increasingly stringent.

[0003] Tests have shown that multi-busbar cells, due to their numerous busbars and thin solder strips, require manual rework, resulting in long repair times and low success rates. This is currently a major challenge for the entire photovoltaic module industry, and automated rework for multi-busbar cells is still just a concept in the industry.

[0004] Therefore, it is necessary to design a special automatic separation and sorting device for photovoltaic cell strings to improve string repair efficiency, increase the success rate of string repair, save labor costs, improve module maintenance efficiency, and reduce module manufacturing costs. Summary of the Invention

[0005] In view of this, the present invention provides an automatic separation and sorting equipment and method for photovoltaic cell strings, which improves the efficiency of string repair, saves labor costs, and standardizes the process flow of cell string separation and sorting.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic separation and sorting method for photovoltaic cell strings includes:

[0008] The defective strings produced by the photovoltaic string welding machine are transported to a designated location for flux spraying.

[0009] The defective wire that has been coated with flux is heated to separate the molten solder strip.

[0010] The successfully separated battery cells undergo visual inspection. Defective battery cells are placed in the NG battery placement area, while good battery cells are output.

[0011] The process involves heating the defective wire after flux application to separate the molten solder strip, including:

[0012] Inside the separation chamber of the serial device, the heating plate is heated to a set temperature by electromagnetic heating;

[0013] The molten solder strip is separated by the solder strip separation fixture and placed in the upper and lower placement bins of the equipment. The successfully separated cells are then transferred to the cell stack through the first production line.

[0014] After the good quality battery cells are output, the process also includes:

[0015] After the good quality battery cells are screened, they enter the cleaning unit and are cleaned by spraying alcohol on the front and back.

[0016] The cleaned battery cells are fed into a drying platform, where a thermocouple is used to heat an aluminum plate to dry the cleaning agent.

[0017] The dried, high-quality battery cells are then fed into the OK battery sorting area.

[0018] The successful separation of the battery cells will be subject to appearance screening, which includes:

[0019] The successfully separated battery cells are fed into the CCD imaging platform in sequence for appearance screening.

[0020] In addition, embodiments of this application also provide an automatic photovoltaic cell string separation and sorting equipment, including a first production line, a flux spraying structure, a second production line, a solder strip separation fixture, and an appearance screening platform. The flux spraying structure is used to receive defective strings output by the photovoltaic welding machine transmitted through the first production line, transmit them to a designated position, and spray flux. The solder strip separation fixture heats the defective strings after flux spraying, separates the solder strip in the molten state, and transmits them through the second production line to the appearance screening platform for appearance screening of the successfully separated cells. The defective cells after separation are placed in the NG cell placement area, and the good cells are output.

[0021] The flux spraying structure includes a bracket and an upper flux nozzle that is detachable and laterally movable and disposed on the lower surface of the upper horizontal bar of the bracket, and a lower flux nozzle that is detachable and laterally movable and disposed on the lower horizontal bar of the bracket. The upper flux nozzle is located above the first production line, and the lower flux nozzle is flush with the first production line. The upper flux nozzle and the lower flux nozzle correspond to the positions of the grid lines of the defective battery cells.

[0022] It also includes a cleaning unit connected to the appearance screening platform, used to spray alcohol on the front and back of the good battery cells for cleaning.

[0023] The cleaning unit is either a pinhole cleaning unit or an immersion cleaning unit.

[0024] It also includes a drying platform connected to the cleaning unit, which is used to dry the cleaning agent of the good battery cells by heating an aluminum plate with a thermocouple on the drying platform, and then the dried good battery cells flow into the OK battery sorting area.

[0025] The welding strip separation fixture includes, from bottom to top, a base, a welding strip separation placement chamber on the back of the battery, an electromagnetic heating plate, a lower welding strip separation fixture, a lifting rod for the separation equipment, a silicone sealing roll, an upper welding strip separation fixture, a welding strip separation placement chamber on the front of the battery, and a top cover. The back of the lower welding strip separation fixture is provided with a horizontally and vertically retractable welding strip clamping fixture and a vertically retractable battery precision positioning strip. The vertically retractable fixture also includes a separation welding strip placement hole located at a predetermined vertical position on the back welding strip clamping fixture, for dropping the disassembled welding strip into the welding strip separation placement chamber on the back of the battery.

[0026] Compared to existing technologies, the above-described automatic photovoltaic cell string separation and sorting method and equipment have the following advantages:

[0027] The described automatic photovoltaic cell string separation and sorting method and equipment first transports defective strings produced by the photovoltaic string welding machine to a designated location where flux is sprayed. Then, the solder layer of the solder ribbon is melted at high temperature, and the solder ribbon is peeled off using tooling based on physical principles, completely separating the cells from the solder ribbon. Finally, the successfully separated cells undergo visual screening. Defective cells are placed in the NG cell placement area, while good cells are output. The visual screening images are transmitted to the background processor, which sends the judgment instructions to the robotic arm to execute the sorting command, thus achieving automated separation and sorting, improving the efficiency of string rework, and saving manpower costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic flowchart of one embodiment of the automatic separation and sorting method for photovoltaic cell strings provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the overall assembly structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0031] Figure 3A schematic diagram of the flux spraying structure of an embodiment of the automatic photovoltaic cell string separation and sorting equipment provided in this invention;

[0032] Figure 4 This is a schematic diagram of the structure of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0033] Figure 5 This is a schematic diagram of the structure of the upper welding strip separation fixture of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0034] Figure 6 This is a schematic diagram of the structure of the lower welding strip separation fixture of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0035] Figure 7 This is a schematic diagram of the secondary distribution control structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0036] Figure 8 This is a schematic diagram of the vacuum cleaning unit structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention;

[0037] Among them, the components are: photovoltaic welding machine-1, defective string prevention placement area-2, photovoltaic welding machine and string automatic separation equipment front assembly line signal docking-3, first assembly line-4, flux spraying structure-5, flux spraying structure enlarged view-10, bracket-101, upper horizontal bar-102, lower horizontal bar-103, string automatic separation equipment front assembly line and string equipment separation chamber signal docking-6, string equipment separation chamber-7, secondary distribution system and equipment control system-8, data transmission and conversion signal line-9, control system display screen-11, cell stack-12, and string automatic separation equipment rear assembly line and battery sorting device signal docking. -13, CCD imaging platform -14, pinhole cleaning unit -15, battery production line -16, drying platform -17, OK battery sorting area -18, NG battery placement area -19, equipment base and battery back solder strip separation placement bin -20, electromagnetic heating plate and solder strip separation lower fixture -21, separation equipment lifting rod -22, silicone sealing roll -23, solder strip separation upper fixture -24, top cover and battery front solder strip separation placement bin -24, solder strip clamping fixture -26, battery precision positioning strip -27, separation solder strip placement hole -28, front solder strip separation placement bin -29, separation solder strip adsorption hole -30. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-8 , Figure 1 A schematic flowchart of one embodiment of the automatic separation and sorting method for photovoltaic cell strings provided by the present invention; Figure 2 This is a schematic diagram of the overall assembly structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention. Figure 3 A schematic diagram of the flux spraying structure of an embodiment of the automatic photovoltaic cell string separation and sorting equipment provided in this invention; Figure 4 This is a schematic diagram of the structure of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention. Figure 5 This is a schematic diagram of the structure of the upper welding strip separation fixture of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention. Figure 6 This is a schematic diagram of the structure of the lower welding strip separation fixture of a welding strip separation tooling in one embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention. Figure 7 This is a schematic diagram of the secondary distribution control structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention. Figure 8 This is a schematic diagram of the vacuum cleaning unit structure of an embodiment of the photovoltaic cell string automatic separation and sorting equipment provided in this invention.

[0040] One specific embodiment of the present invention provides an automatic separation and sorting method for photovoltaic cell strings, comprising:

[0041] S1, the defective strings produced by the photovoltaic string welding machine are transferred to a designated location to be sprayed with flux;

[0042] S2, the defective wire that has been coated with flux is heated to separate the solder strip in the molten state;

[0043] S3 performs visual screening on the successfully separated battery cells, and sends the defective battery cells to the NG battery placement area, while outputting the good battery cells.

[0044] The defective photovoltaic string welding machine first transports the defective strings to a designated location where flux is sprayed. Then, the solder layer of the solder ribbon is melted at high temperature, and the solder ribbon is peeled off using tooling based on physical principles, completely separating the cells from the solder ribbon. Finally, the successfully separated cells undergo visual screening. Defective cells are placed in the NG cell placement area, while good cells are output. The visual screening images are transmitted to the back-end processor, which sends the judgment instructions to the robot to execute the sorting command. This achieves automated separation and sorting, improves the efficiency of string rework, and saves manpower costs.

[0045] In this application, defective strings produced by a photovoltaic string welding machine are generally transported to a designated location via an assembly line for flux spraying. The specific process for separating the solder strip is not limited. In one embodiment, the defective strings after flux spraying are heated to separate the molten solder strip, including:

[0046] Inside the separation chamber of the serial device, the heating plate is heated to a set temperature by electromagnetic heating;

[0047] The molten solder strip is separated by the solder strip separation fixture and placed in the upper and lower placement bins of the equipment. The successfully separated cells are then transferred to the cell stack through the first production line.

[0048] By employing electromagnetic heating, the tin layer of the solder ribbon is melted at high temperature. Using tooling and physical principles, the solder ribbon is peeled off, completely separating the battery from the solder ribbon in the separation chamber of the stringing equipment. The battery is then placed in the upper and lower placement bins of the solder ribbon. The successfully separated battery is then transferred to the cell stack through the first production line, realizing the recycling of the solder ribbon and the storage of the battery in the cell stack.

[0049] This application includes, but is not limited to, the above-described manner and structure, and does not limit the size of the upper component.

[0050] Since the batteries, after initial solder strip recycling, are stored in a cell stack, the surface of these batteries inevitably contains many impurities, which are not conducive to subsequent direct use. To facilitate subsequent direct use, in one embodiment, after outputting the good cells, the process further includes:

[0051] After the good quality battery cells are screened, they enter the cleaning unit and are cleaned by spraying alcohol on the front and back.

[0052] The cleaned battery cells are fed into a drying platform, where a thermocouple is used to heat an aluminum plate to dry the cleaning agent.

[0053] The dried, high-quality battery cells are then fed into the OK battery sorting area.

[0054] After the good quality battery cells are screened, they are cleaned in the cleaning unit, dried in the drying platform, and finally flowed into the OK battery sorting area. This allows the battery cells to be directly extracted and used in the OK battery sorting area. Moreover, due to the cleaning and drying process, there will be no negative impact on the space or other battery cells, thus improving the efficiency of subsequent use.

[0055] This application does not limit the structure or operation of the cleaning unit and drying platform.

[0056] This application requires visual screening of successfully separated battery cells. The screening device and standards are not limited; either global or local detection methods can be used. Furthermore, the detection process can directly determine whether a cell passes or fails. This application does not limit the specific determination or screening process. In one embodiment, visual screening of successfully separated battery cells includes:

[0057] The successfully separated battery cells are fed into the CCD imaging platform in sequence for appearance screening.

[0058] The CCD imaging platform is used for appearance screening. High-resolution CCD images are used to identify and separate battery images, which are then transmitted to the back-end processor. The judgment instructions are sent to the robotic arm to execute the sorting command. This allows back-end staff to make real-time corrections even if incorrect sorting occurs, enabling manual screening and facilitating subsequent re-identification, thus improving the accuracy of the screening.

[0059] This application includes, but is not limited to, using the aforementioned CCD imaging platform.

[0060] In addition, embodiments of this application also provide an automatic photovoltaic cell string separation and sorting equipment, including a first production line 4, a flux spraying structure 5, a second production line, a solder strip separation fixture, and an appearance screening platform. The flux spraying structure 5 is used to receive defective strings output by the photovoltaic welding machine 1 transmitted through the first production line, transmit them to a designated position, and spray flux. The solder strip separation fixture heats the defective strings after flux spraying, separates the solder strip in the molten state, and transmits them through the second production line to the appearance screening platform for appearance screening of the successfully separated cells. The separated defective cells are placed in the NG cell placement area 19, and the good cells are output.

[0061] Since the photovoltaic cell string automatic separation and sorting equipment is the same as the photovoltaic cell string automatic separation and sorting method described above, and has the same beneficial effects, this application will not elaborate on it further.

[0062] The photovoltaic cell string automatic separation and sorting equipment in this application mainly includes three parts: the first part is the connection part between the photovoltaic welding machine 1 and the automatic string separation equipment production line; the second part is the production line, automatic string separation and complete set of equipment secondary distribution system; the control system display screen 11; and the third part is the battery sorting device.

[0063] The first part simply involves connecting the defective photovoltaic welding machine 1 to the corresponding production line, which is a simple structure. The main tasks are the subsequent separation of the welding strips and the appearance screening.

[0064] The structure for separating the solder strips is not limited. To improve the separation efficiency, flux needs to be sprayed in advance using a nozzle. This application does not limit the structure. In one embodiment, the flux spraying device includes a bracket 101 and an upper flux nozzle that is detachable and laterally movable on the lower surface of the upper horizontal bar 101 of the bracket 101, and a lower flux nozzle that is detachable and laterally movable on the lower horizontal bar 103 of the bracket 101. The upper flux nozzle is located above the first production line 4, and the lower flux nozzle is flush with the first production line 4. The upper flux nozzle and the lower flux nozzle correspond to the positions of the grid lines of the defective battery cells.

[0065] By employing upper and lower flux nozzles, it is possible to separate the solder strips of single-sided and double-sided solar cells. Furthermore, by moving the nozzles laterally, it is possible to separate the solder strips of solar cells of different sizes and types. In addition, the nozzles are generally detachable, which facilitates subsequent maintenance and improves maintenance efficiency.

[0066] To further improve the direct utilization of the solar cells and reduce the negative impact on the device and adjacent solar cells, in one embodiment, the photovoltaic cell string automatic separation and sorting equipment further includes a cleaning unit connected to the appearance screening platform, used to spray alcohol on the front and back of the good quality solar cells for cleaning.

[0067] The washing unit sprays alcohol onto the front and back of the good quality battery cells to clean them, thereby removing impurities from the surface of the battery cells, reducing storage costs, and improving subsequent utilization efficiency.

[0068] This application includes, but is not limited to, the cleaning unit structure and cleaning method described above.

[0069] This application does not limit the structure of the cleaning unit, which is either a pinhole cleaning unit 15 or an immersion cleaning unit.

[0070] This application includes, but is not limited to, the pinhole cleaning unit 15 or the immersion cleaning unit described above. Using the pinhole cleaning unit 15 allows the battery surface to be cleaned with less cleaning solution, and the cleaning process is simple. Using the immersion cleaning unit, there is a possibility that impurities may continue to exist.

[0071] To further clean the solar cells and facilitate their rapid use, in one embodiment, the photovoltaic cell string automatic separation and sorting device further includes a drying platform 17 connected to the cleaning unit. The drying platform 17 uses thermocouples to heat an aluminum plate to dry the cleaning agent on the good solar cells, and then the dried good solar cells flow into the OK cell sorting area 18.

[0072] By using the drying platform 17 to heat the aluminum plate with thermocouples, the cleaning agent of the good battery cells is dried, and the dried good battery cells are flowed into the OK battery sorting area 18. This avoids the increased time caused by natural drying, thus improving efficiency. Moreover, using the drying platform 17 for drying operations can control the evaporated moisture within a certain range, preventing the moisture or cleaning agent from spreading randomly, thereby improving the safety and reliability of operation.

[0073] This application does not limit the structure of the drying platform 17, including but not limited to using the above-mentioned thermocouple heating aluminum plate, and other structures may also be used.

[0074] The specific structure of the solder strip separation in this application is not limited. In one embodiment, the solder strip separation fixture includes, from bottom to top, a base, a solder strip separation placement chamber 29 on the back of the battery, an electromagnetic heating plate, a lower solder strip separation fixture, a separation equipment lifting rod 22, a silicone sealing roll 23, an upper solder strip separation fixture 24, a solder strip separation placement chamber on the front of the battery, and a top cover. The back of the lower solder strip separation fixture is provided with a horizontally and vertically retractable solder strip clamping fixture 26 and a vertically retractable battery precision positioning strip 27. The vertical retraction also includes a solder strip separation placement hole 28 provided at a predetermined vertical position on the back solder strip clamping fixture for dropping the disassembled solder strip into the solder strip separation placement chamber 29 on the back of the battery.

[0075] This application uses a lower welding strip separation fixture 24 and an upper welding strip separation fixture 24, which can realize the separation of welding strips from the top and bottom respectively. The lifting rod 22 of the separation equipment can be used to fix the object to be operated. After the welding strip is peeled off, it can be taken out. The structure is simple.

[0076] In one embodiment, the photovoltaic cell string automatic separation and sorting equipment mainly consists of three parts: Part 1: The connection between the photovoltaic welding machine 1 (for defective strings) and the automatic string separation equipment production line; Photovoltaic welding machine 1, defective string prevention placement area 2, and signal connection between the photovoltaic welding machine and the front production line of the automatic string separation equipment 3. Part 2: Production line, automatic string separation and complete equipment secondary distribution system, front production line of the automatic string separation equipment, flux spraying structure 5, signal connection between the front production line of the automatic string separation equipment and the string equipment separation chamber 7 6, string equipment separation chamber 7, secondary distribution system and equipment control system 8, data transmission and conversion signal line 9, and control system display screen. Part 3: Battery sorting device, cell stack 12, signal connection between the rear production line of the automatic string separation equipment and the battery sorting device 13, CCD imaging platform 14, pinhole cleaning unit 15, battery production line 16, drying platform 17, OK battery sorting area 18, and NG battery placement area 19.

[0077] The flux spraying structure 5 is mainly divided into two parts. The first part is the bracket 101. The second part is the upper and lower flux spray head device. The upper row is above the production line, and the lower row is embedded at the same level as the production line. The spray heads are detachable and can be moved laterally to keep in line with the grid lines of the battery cells.

[0078] The automatic photovoltaic cell string separation equipment consists of, from bottom to top, a base and a cell back welding strip separation and placement chamber 20, an electromagnetic heating plate and a welding strip separation lower fixture 21, a separation equipment lifting rod 22, a silicone sealing roll 23, a welding strip separation upper fixture 24, a top cover and a cell front welding strip separation and placement chamber 24.

[0079] The welding strip separation fixture is mainly divided into two parts. The first part is the upper welding strip separation fixture 24; the second part is the lower welding strip separation fixture and the welding strip clamping fixture 26, which can be extended in both the horizontal and vertical directions. The battery precision positioning strip 27 can be extended in the vertical direction. The welding strip placement hole 28 is located in the vertical direction of the welding strip clamping fixture 26. Its function is to drop the disassembled welding strip into the front welding strip separation placement chamber 29. The front welding strip clamping fixture can be extended in both the horizontal and vertical directions. The welding strip adsorption hole 30 is located in the vertical direction of the front welding strip clamping fixture. Its function is to adsorb the disassembled welding strip into the front welding strip separation placement chamber.

[0080] The pinhole-type single-row cleaning unit is made of epoxy resin. The bottom has a row of pinholes for spraying. For example, alcohol can be used to clean dirt and flux from the surface of the battery cells.

[0081] The secondary distribution system and equipment control system 8 includes a data transmission and conversion signal line 9 and a power supply 31, PLC 32, frequency converter 33, speed controller 34, relay 35, analog-to-digital converter 36, data acquisition unit 37, electromagnetic heater 38, servo motor controller 39, CCD image controller 40, thermocouple controller 41, and corresponding equipment connected through the data transmission and conversion signal line 9.

[0082] In summary, the photovoltaic cell string automatic separation and sorting method and device provided in this application first transmit defective photovoltaic cell strings produced by the photovoltaic string welding machine to a designated location for flux spraying. Then, the solder layer of the solder ribbon is melted at high temperature, and the solder ribbon is peeled off using tooling based on physical principles, so that the cells are completely separated from the solder ribbon. Finally, the successfully separated cells are visually screened, and the defective cells are placed in the NG cell placement area, while the good cells are output. The visually screened images are transmitted to the background processor, and the judgment instructions are sent to the robot to execute the sorting command, thereby realizing automated separation and sorting, improving the efficiency of string rework, and saving manpower costs.

[0083] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0085] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0086] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0087] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0088] If a flowchart is used in this application, it is used to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0089] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for automatically separating and sorting a string of photovoltaic cells, characterized by, include: The defective strings produced by the photovoltaic string welding machine are transported to a designated location for flux spraying. The defective string after fluxing is applied is heated to separate the molten solder strips so that the individual cells in the defective string are separated from each other. The successfully separated battery cells undergo visual inspection. Defective cells are placed in the NG (non-performing) battery area, while good cells are output. The defective cells, after being coated with flux, are heated to separate the molten solder ribbon, including: Inside the separation chamber of the serial device, the heating plate is heated to a set temperature by electromagnetic heating; The molten solder strip is separated from the equipment using a solder strip separation fixture and placed in the upper and lower placement bins. Successfully separated cells are then transferred to the cell stack via the first production line. After outputting the good cells, the process includes: After the good quality battery cells are screened, they enter the cleaning unit and are cleaned by spraying alcohol on the front and back. The cleaned battery cells are fed into a drying platform, where a thermocouple is used to heat an aluminum plate to dry the cleaning agent. The dried, high-quality battery cells are then fed into the OK battery sorting area. The welding strip separation fixture includes, from bottom to top, a base, a welding strip separation placement chamber on the back of the battery, an electromagnetic heating plate, a welding strip separation lower fixture, a separation equipment lifting rod, a silicone sealing roll, a welding strip separation upper fixture, a welding strip separation placement chamber on the front of the battery, and a top cover. The back of the welding strip separation lower fixture is provided with a horizontally and vertically retractable welding strip clamping fixture and a vertically retractable battery precision positioning strip. It also includes a separation welding strip placement hole set at a predetermined vertical position of the welding strip clamping fixture for dropping the disassembled welding strip into the welding strip separation placement chamber on the back of the battery. The heating plate is the electromagnetic heating plate.

2. The method of claim 1, wherein the step of separating the photovoltaic cell string comprises the step of: The successfully separated solar cells will undergo an appearance screening process, including: ​ The successfully separated battery cells are fed into the CCD imaging platform in sequence for appearance screening.

3. An automatic photovoltaic cell string separation and sorting device, characterized in that, The system includes a first production line, a flux spraying structure, a second production line, a solder strip separation fixture, and an appearance screening platform. The flux spraying structure receives defective strings at a designated location and sprays flux onto them. These defective strings are output from a photovoltaic welding machine transported via the first production line and then transported to the designated location. The solder strip separation fixture heats the flux-coated defective strings, separating the molten solder strip to separate the individual solar cells within the defective strings. The second production line then separates the defective cells from the first production line. The second production line transmits the successfully separated battery cells to the appearance screening platform for appearance screening. Defective battery cells are placed in the NG battery placement area, while good battery cells are output. The flux spraying structure includes a bracket and a detachable, laterally movable upper flux nozzle mounted on the lower surface of the upper horizontal bar of the bracket, and a detachable, laterally movable lower flux nozzle mounted on the lower horizontal bar of the bracket. The upper flux nozzle is located above the first production line, and the lower flux nozzle is flush with the first production line. The upper and lower flux nozzles correspond to the grid lines of the defective battery cells. The system also includes a cleaning unit connected to the appearance screening platform, used to spray alcohol onto the front and back of the good battery cells for cleaning. The cleaning unit can be a pinhole cleaning unit or an immersion cleaning unit. Furthermore, it includes a drying platform connected to the cleaning unit, used to dry the cleaning agent from the good battery cells by heating an aluminum plate with a thermocouple. The dried good battery cells then flow into the OK battery sorting area. The separation fixture includes, from bottom to top, a base, a battery back solder strip separation placement chamber, an electromagnetic heating plate, a lower solder strip separation fixture, a separation equipment lifting rod, a silicone sealing roll, an upper solder strip separation fixture, a battery front solder strip separation placement chamber, and a top cover. The back of the lower solder strip separation fixture is provided with a horizontally and vertically retractable solder strip clamping fixture and a vertically retractable battery precision positioning strip. It also includes a separation solder strip placement hole set at a predetermined vertical position of the solder strip clamping fixture for dropping the disassembled solder strip into the battery back solder strip separation placement chamber.

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