Solar cell string and solar cell string gluing device

Abstract

The utility model relates to the field of photovoltaic technology, in particular to a solar cell string and a solar cell string gluing device. The solar cell string comprises solar cells, a solder strip, a first colloid and a second colloid. Wherein the solar cell is provided with an auxiliary grid line, and the welding strip is lapped on the auxiliary grid line. The first colloid is located on one side of the welding strip, the second colloid is located on the other side of the welding strip, one side of the first colloid is bonded with the welding strip, and the other side of the first colloid is bonded with the auxiliary grid line; one side of the second colloid is bonded with the welding strip, and the other side of the second colloid is bonded with the auxiliary grid line; the first colloid and the second colloid jointly form a glue point, and the glue point is configured to enable the welding strip and the auxiliary grid line to form bonding force. The height of the first colloid and the height of the second colloid are both lower than the height of the solder strip along the thickness direction of the solar cell, so that the thickness of the solar cell string can be reduced, the solar cell is prevented from cracking during a lamination process, the qualified rate of products is improved, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and particularly relates to a solar cell string and a glue application device for a solar cell string. Background Art

[0002] At present, the metallization cost of solar cells is relatively high. Conventional solar cells need to print main silver grid lines and auxiliary silver grid lines on both the front and back sides, and at the same time, print thick solder pads (pad points) at specific positions on each main silver grid line, so as to increase the bonding force between the solder ribbon and the main silver grid line.

[0003] In order to reduce the metallization cost of conventional solar cells in the prior art, an industry has developed a solar cell without main silver grid lines and pad points. When the solder ribbon is welded to the solar cell, the auxiliary silver grid lines (fine grid lines) on the solar cell form an alloy with the solder ribbon. Since the contact area between the fine grid lines and the solder ribbon is small, the bonding force of this alloy is less than that of the alloy formed by the main grid and pad points of the traditional solar cell and the solder ribbon. Therefore, it is necessary to strengthen the bonding force between the solder ribbon and the cell after welding the solder ribbon and the fine grid lines.

[0004] Generally, a dispensing machine is used to dispense glue on the solder ribbon and the fine grid lines to improve the bonding force between the solder ribbon and the fine grid lines. However, the height of the glue on the cell string formed by this dispensing method is often higher than that of the solder ribbon. This not only increases the consumption of glue and the cost, but also thickens the thickness of the cell string after dispensing, thereby increasing the risk of cracking during the subsequent lamination process of the cell string and reducing the product qualification rate.

[0005] Therefore, it is urgent to design a solar cell string and a glue application device for a solar cell string to solve the above technical problems. Summary of the Utility Model

[0006] The first object of the present utility model is to provide a solar cell string, which reduces the glue consumption and saves the production cost; at the same time, reduces the risk of cracking of the solar cells during the lamination process and improves the product qualification rate.

[0007] To achieve this purpose, the present utility model adopts the following technical solutions:

[0008] The present utility model provides a solar cell string, comprising:

[0009] Solar cells, on which auxiliary grid lines are provided;

[0010] Solder ribbons, which are lapped on the auxiliary grid lines;

[0011] A first colloid and a second colloid, the first colloid is located on one side of the solder strip, and the second colloid is located on the other side of the solder strip. One side of the first colloid is adhesively connected to the solder strip, and the other side is adhesively connected to the auxiliary grid line; one side of the second colloid is adhesively connected to the solder strip, and the other side is adhesively connected to the auxiliary grid line; the first colloid and the second colloid together form a glue point, and the glue point is configured to enable the solder strip and the auxiliary grid line to form an adhesive force.

[0012] Along the thickness direction of the solar cell, the heights of both the first colloid and the second colloid are lower than the height of the solder strip.

[0013] As an alternative technical solution of a solar cell string, along the thickness direction of the solar cell, there is a first gap M between the top of the first colloid and the top of the solder strip, and a second gap N between the top of the second colloid and the top of the solder strip, and the first gap M is equal to the second gap N.

[0014] As an alternative technical solution of a solar cell string, along the width direction of the solar cell, the width of the first colloid is equal to the width of the second colloid.

[0015] As an alternative technical solution of a solar cell string, both the auxiliary grid lines and the solder strips are provided in multiple numbers, the auxiliary grid lines and the solder strips are arranged in one-to-one correspondence, and the multiple auxiliary grid lines are arranged at equal intervals.

[0016] As an alternative technical solution of a solar cell string, each solder strip is provided with multiple glue points, and the multiple glue points are arranged at equal intervals.

[0017] As an alternative technical solution of a solar cell string, along the length direction of the solar cell, the multiple glue points are arranged in a straight line.

[0018] As an alternative technical solution of a solar cell string, both the first colloid and the second colloid are triangular or both are fan-shaped.

[0019] The second object of the present invention is to propose a glue application device for a solar cell string, which can reduce the amount of glue used and save production costs; at the same time, reduce the risk of cracking of the solar cell during lamination and improve the product qualification rate.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] The present utility model provides a glue application device for a solar cell string, which includes a first conveying assembly and a glue spraying assembly. The first conveying assembly is used to convey the above-mentioned solar cell string, and the glue spraying assembly is erected above the first conveying assembly. The glue spraying assembly is configured to spray a first colloid and a second colloid on both sides of the solder ribbon respectively.

[0022] As an alternative technical solution of a glue application device for a solar cell string, a first nozzle and a second nozzle are provided on the glue spraying assembly. The first nozzle faces one side of the solder ribbon, and the second nozzle faces the other side of the solder ribbon. The first nozzle is used to spray the first colloid, and the second nozzle is used to spray the second colloid.

[0023] As an alternative technical solution of a glue application device for a solar cell string, the glue application device for a solar cell string further includes a second conveying assembly, and the glue spraying assembly is slidably connected to the second conveying assembly.

[0024] The beneficial effects of the present utility model at least include:

[0025] The present utility model provides a solar cell string, which includes solar cell chips, solder ribbons, a first colloid and a second colloid. Among them, auxiliary grid lines are provided on the solar cell chips, and the solder ribbons are lapped on the auxiliary grid lines. The first colloid is located on one side of the solder ribbon, and the second colloid is located on the other side of the solder ribbon. One side of the first colloid is adhesively connected to the solder ribbon, and the other side is adhesively connected to the auxiliary grid line; one side of the second colloid is adhesively connected to the solder ribbon, and the other side is adhesively connected to the auxiliary grid line; the first colloid and the second colloid jointly form a glue point, and the glue point is configured to enable the solder ribbon and the auxiliary grid line to form an adhesive force, so as to increase the bonding force between the auxiliary grid line and the solder ribbon, avoid open circuit phenomena such as disconnection and loosening between the solder ribbon and the solar cell chip, and improve stability. Along the thickness direction of the solar cell chip, the heights of both the first colloid and the second colloid are lower than the height of the solder ribbon, which can reduce the thickness of the solar cell string, and further avoid the phenomenon of cracking of the solar cell chip during the later lamination process, improving the product qualification rate; at the same time, it can also save the glue usage of the first colloid and the second colloid, and achieve the purpose of saving production costs on the premise of ensuring the bonding force between the solder ribbon and the solar cell chip.

[0026] The present utility model also provides a glue application device for a solar cell string, which can reduce the glue usage and save production costs; at the same time, it reduces the risk of cracking of the solar cell chip during lamination and improves the product qualification rate. Description of the Drawings

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0028] Figure 1 is a schematic structural diagram of a solar cell string provided in the first embodiment of the present invention;

[0029] Figure 2 is Figure 1 a partial enlarged view of part A in

[0030] Figure 3 is a schematic structural diagram of the solar cell string provided in the first embodiment of the present invention before applying glue;

[0031] Figure 4 is a schematic structural diagram of the solar cell string provided in the first embodiment of the present invention after applying glue;

[0032] Figure 5 is a schematic structural diagram of a solar cell string glue application device provided in the second embodiment of the present invention.

[0033] Reference numerals

[0034] 100, solar cell; 200, solder tape; 300, glue dots; 310, first colloid; 320, second colloid; 400, first conveying component; 500, glue spraying component; 600, second conveying component; 700, CCD positioning camera; 800, UV curing lamp. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation on the present utility model.

[0042] Embodiment 1

[0043] This embodiment provides a solar cell string, which reduces the amount of glue used and saves production costs. At the same time, it reduces the risk of cracking of solar cells during the lamination process and improves the product qualification rate.

[0044] As Figures 1-4 shown, the solar cell string mainly includes solar cells 100, solder tapes 200, a first colloid 310, and a second colloid 320. Among them, auxiliary grid lines are provided on the solar cells 100, and the solder tapes 200 are lapped on the auxiliary grid lines. The first colloid 310 is located on one side of the solder tape 200, and the second colloid 320 is located on the other side of the solder tape 200. One side of the first colloid 310 is adhesively connected to the solder tape 200, and the other side is adhesively connected to the auxiliary grid line; one side of the second colloid 320 is adhesively connected to the solder tape 200, and the other side is adhesively connected to the auxiliary grid line; the first colloid 310 and the second colloid 320 together form a glue point 300, and the glue point 300 is configured to form an adhesive force between the solder tape 200 and the auxiliary grid line, so as to increase the bonding force between the auxiliary grid line and the solder tape 200, and avoid open circuit phenomena such as disconnection and loosening between the solder tape 200 and the solar cell 100, and improve stability. Along the thickness direction of the solar cell 100, the heights of both the first colloid 310 and the second colloid 320 are lower than the height of the solder tape 200. This can reduce the thickness of the solar cell string, and further avoid the phenomenon of cracking of the solar cell 100 in the subsequent lamination process, improving the product qualification rate; at the same time, it can also save the amount of glue used for the first colloid 310 and the second colloid 320, and achieve the purpose of saving production costs on the premise of ensuring the bonding force between the solder tape 200 and the solar cell 100.

[0045] It should be noted that the thickness direction of the solar cell 100 is the Figure 1 Y-axis direction in

[0046] Further, in this embodiment, along the thickness direction of the solar cell 100 ( Figure 1 the Y-axis direction in Figure 1 ), a first gap M is provided between the top of the first colloid 310 and the top of the solder tape 200, and a second gap N is provided between the top of the second colloid 320 and the top of the solder tape 200. The first gap M is equal to the second gap N. Along the width direction of the solar cell 100 (

[0047] Figure 1 the X-axis direction in

[0047] ), the widths of the first colloid 310 and the second colloid 320 are equal. This can ensure that the bonding forces between the two sides of the solder tape 200 and the auxiliary grid line are consistent, and further improve the uniformity of the force on the solder tape 200, and avoid phenomena such as stress concentration or insufficient local bonding force.Exemplarily, both the first gap M and the second gap N can be set to be between 0.01 mm and 0.5 mm. The width of the first colloid 310 is equal to the width of the second colloid 320, and both can be set to be between 0.5 mm and 2 mm.

[0048] Optionally, as Figures 3-4 shown, in this embodiment, both the sub-grid lines and the solder tapes 200 are provided in multiple numbers. The sub-grid lines and the solder tapes 200 are arranged in one-to-one correspondence, and the multiple sub-grid lines are equally spaced along the Z-axis direction, thereby improving the current transmission efficiency of the solar cell 100. Optionally, the number of sub-grid lines and solder tapes 200 on each solar cell 100 can be set to 6, 8, 10, etc., and will not be elaborated here one by one.

[0049] Furthermore, in this embodiment, a plurality of glue dots 300 are provided on each solder tape 200, and the plurality of glue dots 300 are equally spaced along the X-axis direction. This can improve the stability and reliability of the adhesion between each solder tape 200 and each sub-grid line.

[0050] Even further, along the length direction of the solar cell 100 ( Figure 4 the Z-axis direction in

[0051] ), the plurality of glue dots 300 on different solder tapes 200 are arranged in a straight line, which can improve the working efficiency of applying glue to the glue dots 300 and save costs.

[0052] Optionally, the solar cell 100 in this embodiment can be in the form of a whole piece (full size) or in the form of a half piece (half size).

[0053] Embodiment 2

[0054] As Figure 5As shown in the figure, this embodiment provides a glue application device for a solar cell string. The glue application device for the solar cell string includes a first conveying component 400 and a glue spraying component 500. The first conveying component 400 is used to convey the solar cell string in the first embodiment. The glue spraying component 500 is installed above the first conveying component 400, and the glue spraying component 500 is configured to spray a first colloid 310 and a second colloid 320 on both sides of the welding tape 200 respectively. By spraying glue on both sides of the welding tape 200 through the glue spraying component 500, the first colloid 310 and the second colloid 320 are formed. Compared with the prior art in which a dispensing machine is used for dispensing, the glue spraying component 500 can spray glue on both sides of the welding tape 200, so that there is no glue bonding on the top of the welding tape 200. That is to say, the heights of the first colloid 310 and the second colloid 320 formed by the glue spraying component 500 are both lower than the height of the welding tape 200. Thus, not only the glue consumption is saved, but also the thickness of the solar cell string can be reduced, the risk of cracking of the solar cell 100 in the lamination process is avoided, and the product qualification rate is improved.

[0055] Optionally, the first conveying component 400 in this embodiment can be set as a conventional conveying belt or a conveying chain.

[0056] Further, a first nozzle and a second nozzle (both the first nozzle and the second nozzle are not shown in the figure) are provided on the glue spraying component 500 in this embodiment. The first nozzle faces one side of the welding tape 200, and the second nozzle faces the other side of the welding tape 200. The first nozzle is used to spray the first colloid 310, and the second nozzle is used to spray the second colloid 320. Through the arrangement of the first nozzle and the second nozzle, the sprayed first colloid 310 and second colloid 320 can be independent of each other and not affect each other. That is to say, the first colloid 310 and the second colloid 320 will not bond to each other on the top of the welding tape 200. Furthermore, the thickness of the solar cell 100 is reduced, the risk of cracking of the solar cell 100 in the lamination process is avoided, and the product qualification rate is improved.

[0057] It should be noted that other structures of the glue spraying component 500 in this embodiment are all components or structures in the prior art. Therefore, the other specific structures and working principles of the glue spraying component 500 will not be described in detail here.

[0058] As Figure 5 shown, the glue application device for the solar cell string in this embodiment further includes a second conveying component 600. The glue spraying component 500 is slidably connected to the second conveying component 600, so that the glue spraying component 500 can slide along the second conveying component 600 to the directly above the solar cell string during operation and retreat to the waiting material position along the second conveying component 600 when not working.

[0059] As Figure 5As shown, the sizing device for the solar cell string further includes a CCD positioning camera 700, a UV (Ultraviolet) curing lamp 800, and a controller (not shown in the figure). The CCD positioning camera 700 is installed above the solar cell string transported by the first conveying assembly 400, collects the position coordinate information of the solder tapes 200 on the solar cell 100 in the form of pictures, and transmits it to the controller. The controller analyzes the received pictures to obtain the specific position coordinates of each solder tape 200 on the solar cell 100, and controls the glue spraying assembly 500 to move on the second conveying assembly 600 and spray glue at the corresponding positions of the solder tapes 200 according to the analyzed position coordinates of the solder tapes 200. The CCD positioning camera 700 is arranged in front of the second conveying assembly 600. The front and back in this application refer to the front and back directions with respect to the transmission direction of the solar cell 100. The UV curing lamp 800 is installed above the first conveying assembly 400, and the UV curing lamp 800 is located behind the second conveying assembly 600. The solar cell 100 after glue spraying continues to be transported by the first conveying assembly 400 to reach the UV curing lamp 800 for UV curing. Under the irradiation of the UV curing lamp 800, the glue dots 300 are cured, so that the solder tapes 200 are bonded to the solar cell 100, thereby obtaining a better bonding force.

[0060] It should be noted that the technical principle of the controller for positioning according to the images collected by the CCD positioning camera 700 can refer to the prior art principle. This embodiment does not limit this, and will not be described in detail here.

[0061] Obviously, the above is only the preferred embodiment of the present utility model and the applied technical principle. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

[0062] Note that in the description of this specification, the descriptions referring to terms such as "some embodiments" and "other embodiments" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A solar cell string, characterized in that: include: A solar cell (100), wherein a secondary grid line is arranged on the solar cell (100); A welding strip (200), the welding strip (200) being overlapped on the secondary grid line; A first colloid (310) and a second colloid (320), wherein the first colloid (310) is located on one side of the welding strip (200), and the second colloid (320) is located on the other side of the welding strip (200); one side of the first colloid (310) is bonded to the welding strip (200), and the other side is bonded to the secondary grid line; one side of the second colloid (320) is bonded to the welding strip (200), and the other side is bonded to the secondary grid line; the first colloid (310) and the second colloid (320) together form a glue point (300), and the glue point (300) is configured to form an adhesive force between the welding strip (200) and the secondary grid line; Along the thickness direction of the solar cell sheet (100), the height of the first colloid (310) and the height of the second colloid (320) are both lower than the height of the welding strip (200).

2. The solar cell string according to claim 1, characterized in that: Along the thickness direction of the solar cell sheet (100), a first gap M is provided between the top of the first colloid (310) and the top of the soldering strip (200), a second gap N is provided between the top of the second colloid (320) and the top of the soldering strip (200), and the first gap M is equal to the second gap N.

3. The solar cell string according to claim 1, characterized in that: Along the width direction of the solar cell sheet (100), the width of the first colloid (310) is equal to the width of the second colloid (320).

4. The solar cell string according to claim 1, characterized in that: The auxiliary grid lines and the welding strips (200) are both arranged in plurality, the auxiliary grid lines and the welding strips (200) are arranged in one-to-one correspondence, and the plurality of auxiliary grid lines are arranged at equal intervals.

5. The solar cell string according to claim 4, characterized in that: A plurality of the glue dots (300) are arranged on each of the welding strips (200), and the plurality of the glue dots (300) are arranged at equal intervals.

6. The solar cell string according to claim 5, characterized in that: Along the length direction of the solar cell sheet (100), a plurality of the glue points (300) are arranged along a straight line.

7. The solar cell string according to any one of claims 1 to 6, characterized in that: The first colloid (310) and the second colloid (320) are both in a triangular shape or in a fan shape.

8. A solar cell string glue application device, characterized in that: The invention comprises a first conveying component (400) and a glue spraying component (500), wherein the first conveying component (400) is used to convey the solar cell string according to any one of claims 1 to 7, and the glue spraying component (500) is mounted above the first conveying component (400), and the glue spraying component (500) is configured to spray a first colloid (310) and a second colloid (320) on both sides of the welding ribbon (200) respectively.

9. The solar cell string glue applying device according to claim 8, characterized in that: The glue spraying assembly (500) is provided with a first nozzle and a second nozzle, the first nozzle facing one side of the welding strip (200), the second nozzle facing the other side of the welding strip (200), the first nozzle being used for spraying the first colloid (310), and the second nozzle being used for spraying the second colloid (320).

10. The solar cell string glue applying device according to claim 9, characterized in that: The solar cell string glue application device further comprises a second transmission component (600), and the glue spraying component (500) is slidably connected to the second transmission component (600).

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