Laser film opening device for BC battery

Abstract

The utility model belongs to the field of solar cell manufacturing, and relates to a BC cell laser film opening device which comprises a first rotating platform and a second rotating platform. A plurality of groups of vacuum chucks are uniformly mounted on a rotating shaft of the first rotating platform, and the number of each group of vacuum chucks is two; the second rotating platform is installed on the side of the first rotating platform, a plurality of sets of stations are evenly installed on a rotating shaft of the second rotating platform, and the number of each set of stations is two; a feeding conveying belt and a discharging conveying belt are erected on the two sides of the first rotating platform, in the initial state, the discharging end of the feeding conveying belt is located below the vacuum suction cup, the feeding end of the discharging conveying belt is located below the vacuum suction cup, and a plurality of silicon wafers are placed on the feeding conveying belt and the discharging conveying belt. Every two silicon wafers are used as a group for feeding. The utility model solves the problem of low capacity of the whole battery when the conventional equipment opens the film.

Description

Technical Field

[0001] This utility model belongs to the field of solar cell manufacturing and relates to a laser film-opening device for BC cells. Background Technology

[0002] BC (Back Contact) cells are a type of platform structure. They represent a technological approach to solar cells and are a general term for various types of back-contact crystalline silicon solar cells. The main characteristic of BC cells is the absence of electrodes on the front; the positive and negative electrode metal grids are arranged in a finger-like, crisscrossing pattern on the back of the cell. The most significant advantage of BC cells is that both the PN junction and the metal contacts are located on the back of the cell, eliminating the obstruction from metal electrodes on the front, thus reducing current loss and improving power generation efficiency. BC cells are compatible with P-type, HJT, and TOPCON technologies, forming various technological routes such as HPBC, HBC, and TBC.

[0003] Currently, laser equipment is widely used in the photovoltaic industry. In BC (Bright Cell) cells, it is used for laser etching, laser grooving, and laser drilling, making it a key piece of equipment in BC cell production. BC solar cells are manufactured by placing all the electrode grid lines on the back side of the cell, avoiding optical losses caused by the front electrode grid lines blocking the light, maximizing the utilization of incident light, increasing short-circuit current, and improving photoelectric conversion efficiency. The existing production line uses Di'er Laser equipment (DR-B2XS-BC-DY25), employing a single-track automated basket conveyor belt for material handling. Individual cells are placed onto a single table using suction cups, corresponding to a single laser head for film cutting, completing the entire cell's film cutting process. Figure 3 As shown, the laser film-opening time for a single cell is long (6-7 seconds), and the hourly capacity of a single-rail machine is low (500-600 cells per hour). In summary, the existing equipment has low hourly capacity and high equipment cost. Utility Model Content

[0004] The purpose of this invention is to provide a laser film-opening device for BC batteries, which solves the problem of low production capacity of existing equipment for opening whole batteries.

[0005] The technical solution adopted by this utility model is a BC battery laser film opening device, which includes a first rotating platform and a second rotating platform.

[0006] The first rotating platform has multiple sets of vacuum suction cups evenly installed on its rotating shaft, with each set containing two vacuum suction cups;

[0007] The second rotating platform is installed next to the first rotating platform. The rotating shaft of the second rotating platform is evenly equipped with multiple sets of workstations, and each set of workstations has two workstations.

[0008] The first rotating platform is equipped with a loading conveyor belt and a unloading conveyor belt on both sides. In the initial state, the unloading end of the loading conveyor belt is located below the vacuum suction cup, and the loading end of the unloading conveyor belt is located below the vacuum suction cup. Multiple silicon wafers are placed on the loading conveyor belt and the unloading conveyor belt, and two silicon wafers are loaded as a group.

[0009] The features of this utility model also include:

[0010] Furthermore, the workstation is divided into a vision workstation, a first laser workstation, a second laser workstation, a detection workstation, and an initial workstation.

[0011] Furthermore, the number of workstations is five.

[0012] Furthermore, the vacuum suction cups consist of four sets.

[0013] Furthermore, the BC battery laser film-opening device also includes two vision cameras, each of which is mounted above each vision station and faces the silicon wafer placed on the vision station.

[0014] Furthermore, the BC battery laser film-opening device also includes two first laser heads and two second laser heads. The two first laser heads are respectively installed above each first laser station, with the first laser head facing the silicon wafer placed on the first laser station.

[0015] Furthermore, two second laser heads are correspondingly mounted above each of the second laser stations, with the second laser heads facing the silicon wafer placed at the second laser station.

[0016] Furthermore, the BC battery laser film-opening device also includes two inspection cameras, which are correspondingly installed above the two inspection stations, with the inspection cameras facing the silicon wafers placed on the inspection stations.

[0017] Furthermore, the feeding end of the feeding conveyor belt is connected to the flower basket.

[0018] Furthermore, the feeding conveyor belt and the unloading conveyor belt are arranged in parallel.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. The feeding conveyor belt of this utility model feeds two silicon wafers together as a group. The number of vacuum chucks on the first rotating platform and the number of workstations on the second rotating platform are increased accordingly to two, ensuring that two silicon wafers can be processed simultaneously during laser film-opening processing, thereby improving the efficiency of the machine's film-opening processing.

[0021] 2. This utility model divides the laser film-cutting components into two groups. The first laser head of the first group only cuts and processes half of the silicon wafer pattern, while the other half of the solar cell pattern is cut and processed by the second laser head of the second group. Since each laser head only cuts and processes half of the solar cell pattern, the film-cutting processing time is only half the time. The two groups of laser heads process simultaneously, and two silicon wafers in each group are cut and processed simultaneously. The hourly output of a single machine can be increased by four times. Under the same output demand, the number of machines is only one-quarter, and the factory area and power demand are also only one-quarter, which greatly reduces the equipment cost and factory power cost of BC batteries. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a top view of the present invention;

[0025] Figure 3 This is a schematic diagram of the existing technology;

[0026] In the diagram, 1. Loading conveyor belt, 2. Unloading conveyor belt, 3. First rotating platform, 4. Vacuum suction cup, 5. Second rotating platform, 6. Workstation, 7. Silicon wafer, 8. Vision camera, 9. Inspection camera, 10. First laser head, 11. Second laser head, 61. Vision workstation, 62. First laser workstation, 63. Second laser workstation, 64. Inspection workstation, 65. Initial workstation. Detailed Implementation

[0027] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The following is in conjunction with the appendix Figure 1 To be continued Figure 3 The present invention will be described in detail with reference to specific embodiments:

[0029] The BC battery laser film-opening device provided by this utility model is for reference. Figures 1-2 Based on the original device, the first rotating platform 3 and the second rotating platform 5 are modified. Multiple sets of vacuum suction cups 4 are evenly installed on the rotating shaft of the first rotating platform 3, and each set of vacuum suction cups 4 has two vacuum suction cups.

[0030] The second rotating platform 5 is installed on the side of the first rotating platform 3. In the initial state, the unloading end of the loading conveyor belt 1 is located below the vacuum suction cup 4, and the loading end of the unloading conveyor belt 2 is located below the vacuum suction cup 4. The rotating shaft of the second rotating platform 5 is evenly equipped with multiple sets of workstations, and each set of workstations 6 has two stations.

[0031] The first rotating platform 3 is equipped with a loading conveyor belt 1 and a unloading conveyor belt 2 on both sides, and the loading conveyor belt 1 and the unloading conveyor belt 2 are arranged in parallel.

[0032] The feeding end of the feeding conveyor belt 1 is connected to the basket. Multiple silicon wafers 7 are placed on the feeding conveyor belt 1 and the unloading conveyor belt 2. Two silicon wafers 7 are fed as a group. A set of vacuum suction cups 4 transports a group of silicon wafers 7. In subsequent processing, this group of silicon wafers 7 is processed simultaneously. That is, the original production line processes one silicon wafer 7 per unit time, but now the production line processes two silicon wafers 7 simultaneously per unit time, which doubles the processing efficiency.

[0033] The vacuum chuck 4 can adsorb and transport the silicon wafers on the loading conveyor belt 1 to the work station of the second rotating platform 5. The second rotating platform rotates the silicon wafers on the work station once for film opening processing, and finally returns to the initial position, where they are adsorbed and transported by the vacuum chuck 4 to the unloading conveyor belt 2.

[0034] According to the laser film-forming steps, the workstation is divided into five areas in sequence: the initial area, the visual imaging area, the first laser film-forming area, the second laser film-forming area, and the product inspection area. The corresponding workstations 6 in each area are the visual workstation 61, the first laser workstation 62, the second laser workstation 63, the inspection workstation 64, and the initial workstation 65. The vacuum suction cup 4 picks up the silicon wafers on the feeding conveyor belt 1 and transports them to the initial workstation 65 of the second rotating platform 5. The second rotating platform 5 rotates, and the initial workstation 65 sequentially enters the initial area, the visual imaging area, the first laser film-forming area, the second laser film-forming area, and the product inspection area, and then sequentially transforms into the visual workstation 61, the first laser workstation 62, the second laser workstation 63, and the inspection workstation 64.

[0035] The number of workstations 6 is five: one initial workstation 65, one vision workstation 61, one first laser workstation 62, one second laser workstation 63, and one inspection workstation 64.

[0036] The vacuum suction cup 4 consists of four sets.

[0037] After entering the visual imaging area, the initial station 63 is transformed into a visual station 61. Two visual cameras 8 are installed above each visual station 61. A whole silicon wafer 7 is placed on each visual station 61. The visual camera 8 faces the silicon wafer 7 below and takes pictures of the silicon wafer 7 for positioning.

[0038] After the vision station 61 enters the first laser decoction area, it transforms into the first laser station 62. Two first laser heads 10 are correspondingly installed above each first laser station 62. A whole silicon wafer 7 is placed on each first laser station 62. The first laser station 62 faces the silicon wafer 7 below. The first laser head 10 decocts half of the silicon wafer 7.

[0039] After the first laser station 62 enters the second laser film-opening area, it transforms into the second laser station 63. Two second laser heads 11 are correspondingly installed above each of the first laser stations 62. The second laser heads 11 face the silicon wafer 7 placed on the second laser station 63 and open the other half of the silicon wafer 7.

[0040] The pattern etched by the first laser head 10 and the pattern etched by the second laser head 11 are combined to form a complete pattern. Since each laser head only processes half of the silicon wafer 7, the two cells are processed simultaneously. The processing time is only half that of the original process, and the processing efficiency can be increased by two times. The hourly capacity of a single machine is increased by a total of four times.

[0041] Based on the existing production line, an inspection component can be added, including two inspection cameras 9. The two inspection cameras 9 are installed above the two inspection stations 64 respectively. The inspection cameras 9 face the silicon wafers 7 placed on the inspection stations 64. The inspection cameras 9 perform defect detection on the silicon wafers 7 and screen out the silicon wafers 7 that are not qualified in the film opening process.

[0042] The working principle of the BC battery laser film-opening device provided by this utility model is as follows:

[0043] a. The feeding machine sequentially extracts silicon wafers 7 from the basket and transports them to the loading area of ​​the first rotating platform 3 via the feeding conveyor belt 1. The vacuum suction cup 4 picks up and rotates the silicon wafers to place them on the initial station 65 of the second rotating platform 5.

[0044] b. The second rotating platform 5 rotates to move the silicon wafer 7 to the vision station 61, and the vision camera 8 above the vision station 61 takes pictures of the silicon wafer 7 for positioning.

[0045] c. The second rotating platform 5 rotates the silicon wafer 7 to the first laser station 62. The first laser head L1 and the first laser scanning head L2 emit light and perform film opening on the left half of silicon wafer I and silicon wafer II at the designated position. The film opening time is 3 seconds.

[0046] d. The second rotating platform 5 rotates the silicon wafer 7 to the second laser station 63. The second laser head R1 and the second laser R2 scan and emit light to open the right half of silicon wafer I and silicon wafer II at the designated position. The opening time is 3 seconds.

[0047] e. The second rotating platform 5 rotates the silicon wafer 7 to the inspection station 64, and the inspection camera 9 inspects the laser-processed silicon wafer 7.

[0048] f. The second rotating platform 5 rotates the silicon wafer 7 to the initial station 65, where it is picked up by the vacuum chuck 4 and transported to the unloading conveyor belt 5. The silicon wafer 7 then flows to the next process.

[0049] The advantages of the BC battery laser film-opening device provided by this utility model are:

[0050] The first laser head of this invention processes only half of the pattern on the silicon wafer, while the other half is processed by the second laser head. Since each laser head only processes half of the pattern on the battery cell, the processing time is reduced to half (the processing time for a single cell is only 3-4 seconds, which is half of the original time). The two cells are processed simultaneously, and the hourly capacity of a single-track machine can be increased by four times, reaching more than 2,000 cells per hour.

[0051] With the same production capacity requirements, only one-quarter of the number of machines is needed, and the corresponding factory area and power requirements are also only one-quarter, which greatly reduces the equipment cost and factory power cost of BC batteries.

[0052] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A laser-assisted film-opening device for BC batteries, characterized in that, Including a first rotating platform (3) and a second rotating platform (5); The first rotating platform (3) has multiple sets of vacuum suction cups (4) evenly installed on its rotating shaft, with two vacuum suction cups (4) in each set; The second rotating platform (5) is installed on the side of the first rotating platform (3). Multiple sets of workstations (6) are evenly installed on the rotating shaft of the second rotating platform (5), and each set of workstations (6) has two workstations. The first rotating platform (3) is equipped with a loading conveyor belt (1) and a unloading conveyor belt (2) on both sides. In the initial state, the unloading end of the loading conveyor belt (1) is located below the vacuum suction cup (4), and the loading end of the unloading conveyor belt (2) is located below the vacuum suction cup (4). Multiple silicon wafers (7) are placed on the loading conveyor belt (1) and the unloading conveyor belt (2), and two silicon wafers (7) are a group.

2. The BC battery laser film-opening device according to claim 1, characterized in that, The workstation (6) is divided into a vision workstation (61), a first laser workstation (62), a second laser workstation (63), an inspection workstation (64), and an initial workstation (65).

3. The BC battery laser film-opening device according to claim 2, characterized in that, The number of workstations (6) is five.

4. The BC battery laser film-opening device according to any one of claims 1 to 3, characterized in that, The vacuum suction cup (4) has four groups.

5. The BC battery laser film-opening device according to claim 2 or 3, characterized in that, The BC battery laser film-opening device also includes two vision cameras (8), each vision camera (8) is installed above each vision station (61), and the vision camera (8) faces the silicon wafer (7) placed on the vision station (61).

6. The BC battery laser film-opening device according to claim 2 or 3, characterized in that, The BC battery laser film-opening device also includes two first laser heads (10) and two second laser heads (11). The two first laser heads (10) are respectively installed above each first laser station (62), and the first laser head (10) faces the silicon wafer (7) placed on the first laser station (62). Two second laser heads (11) are installed above each of the second laser stations (63), with the second laser heads (11) facing the silicon wafer (7) placed at the second laser station (63).

7. The BC battery laser film-opening device according to claim 2 or 3, characterized in that, It includes two inspection cameras (9), which are installed above the two inspection stations (64) respectively, with the inspection cameras (9) facing the silicon wafer (7) placed on the inspection station (64).

8. The BC battery laser film-opening device according to claim 1, characterized in that, The feeding end of the feeding conveyor belt (1) is connected to the flower basket.

9. The BC battery laser film-opening device according to claim 1, characterized in that, The feeding conveyor belt (1) and the unloading conveyor belt (2) are arranged in parallel.

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