Photovoltaic welding strip and photovoltaic module

Abstract

The utility model discloses a photovoltaic welding strip and a photovoltaic assembly, and belongs to the technical field of solar power generation auxiliary equipment. The photovoltaic welding strip comprises a face deviating from a battery and a face facing the battery, the face facing the battery is provided with a twill groove, a protruding block is arranged in the twill groove, the photovoltaic welding strip is further provided with a coupling platform, and the coupling platform is used for welding a battery piece or a bus bar. The photovoltaic module comprises a photovoltaic solder strip. The device provided by the utility model is used for solving the problems that the reflection multiplexing effect on the surface of the photovoltaic welding strip is not ideal and the expected effect cannot be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar power generation auxiliary equipment, in particular to a photovoltaic solder ribbon and a photovoltaic module. Background Art

[0002] A solar photovoltaic system refers to a facility that converts solar energy into electrical energy by utilizing the photovoltaic effect of photovoltaic semiconductor materials. The core of a photovoltaic facility is a solar panel. Currently, the semiconductor materials used for power generation mainly include: monocrystalline silicon, polycrystalline silicon, amorphous silicon, cadmium telluride, etc. In recent years, due to the active promotion of the application of renewable energy in various countries, the development of the photovoltaic industry has been very rapid.

[0003] A photovoltaic module (also called a solar panel) is the core part of a solar power generation system and also the most important part of a solar power generation system.

[0004] A photovoltaic solder ribbon, also known as a tinned copper ribbon or a tinned copper tape, is divided into a bus bar and an interconnecting strip, and is used for connecting between the battery cells of a photovoltaic module, playing an important role in conducting and aggregating electricity. The solder ribbon is an important raw material in the welding process of a photovoltaic module, and the quality of the solder ribbon will directly affect the current collection efficiency of the photovoltaic module and has a great impact on the power of the photovoltaic module.

[0005] A groove angle is usually set during the production process of a photovoltaic solder ribbon, which can enable the reflected light to be reflected back to the battery surface through the glass / air surface of the module within the angle range of total reflection. Even so, the ability of reflective reuse is still not ideal and has limitations. At the same time, the back silver surface of the solder ribbon with grooves has a high risk of virtual soldering on the automatic string welding device.

[0006] Chinese invention patent CN103985775B discloses a high-efficiency photovoltaic heterogeneous solder ribbon, which realizes the reflective reuse of the solder ribbon surface and reduces the welding stress to ensure the welding strength through the combination of a V-shaped groove and a coupling platform. However, the reflective reuse effect on its surface is not ideal and cannot achieve the expected effect. And the coupling platform is arranged between adjacent V-shaped grooves, and there are problems of virtual soldering on the back of the solder ribbon base and insufficient welding force on the automatic string welding device, and the coupling platform cannot give full play to its role. Utility Model Content

[0007] Under the above background, the utility model provides a photovoltaic solder ribbon, which includes a surface facing away from the battery and a surface facing the battery. The surface facing the battery is provided with inclined groove trenches, and convex blocks are arranged in the inclined groove trenches. The photovoltaic solder ribbon is also provided with a coupling platform, and the coupling platform is used for welding battery cells or bus bars.

[0008] The concept of the present utility model lies in: through the improvement of the solder ribbon structure, bumps are provided to enhance the light reflection and reuse ability. By reserving a coupling platform at the position corresponding to the end of the solder ribbon frame body on the inclined groove, the welding problem in the photovoltaic string soldering process is solved through the coupling platform.

[0009] Preferably, the inclined grooves are arranged at equal intervals parallel to the extending direction of the photovoltaic solder ribbon.

[0010] Preferably, the coupling platform is arranged as a quadrilateral, and the coupling platform is integrally formed with the photovoltaic solder ribbon or welded on the surface of the photovoltaic solder ribbon.

[0011] Preferably, the bump is a conical bump.

[0012] Preferably, the bump is integrally formed with the inclined groove.

[0013] Preferably, the bumps are arranged at equal intervals inside the inclined groove, and the interval between adjacent bumps is 4 - 10 mm.

[0014] Preferably, the surface of the inclined groove is provided with a heat-conducting coating.

[0015] Preferably, the groove angle of the inclined groove is an acute angle.

[0016] On the other hand, the present utility model also provides a photovoltaic module, and the photovoltaic module includes the photovoltaic solder ribbon described in any one of the foregoing items.

[0017] The beneficial effects of the present utility model are as follows: Compared with the prior art, the photovoltaic solder ribbon of the present utility model has the ability to reflect the surface reflected light back to the battery surface for reuse through the glass-air interface of the photovoltaic module by leaving a certain area of the coupling platform position on the inclined groove, and perfectly solves the technical problems of high risk of back silver surface virtual soldering / insufficient welding force on the surface with inclined grooves in the automatic string soldering device;

[0018] By arranging a plurality of bumps in the inclined groove, the light utilization rate can be improved by multiple reflections of the sunlight after passing through the bumps, and the use efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shows a schematic diagram of the overall structure of the photovoltaic solder ribbon;

[0020] Figure 2 Shows Figure 1 The partial enlarged view of part A in

[0021] The reference numerals are as follows:

[0022] 1. Photovoltaic solder ribbon, 2. Battery-back surface, 3. Battery-facing surface, 4. Inclined groove, 5. Bump, 6. Coupling platform, 7. Heat-conducting coating. Specific Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0024] Herein, the schematic specific embodiments of this application and their descriptions are used to explain this application, but do not limit this application.

[0025] The following will elaborate on the photovoltaic solder ribbon of the present utility model in detail with reference to the accompanying drawings.

[0026] In existing photovoltaic solder ribbon products, the method of setting V-shaped grooves is usually adopted to improve the light reflection reuse effect on the battery surface. However, this method still cannot achieve the best battery collection efficiency of photovoltaic modules.

[0027] On the other hand, by setting a coupling platform, the problem of insufficient welding strength in the production process of photovoltaic modules is solved. However, due to the structure and combination form of the coupling platform, when applied to an automatic string welding device, there is still a problem of insufficient welding force, and the coupling platform cannot fully play its connection role.

[0028] The photovoltaic solder ribbon of this embodiment is designed to solve the above problems.

[0029] As Figure 1 shown, a photovoltaic solder ribbon includes a photovoltaic solder ribbon 1, which is made of foamed copper, and the copper content in the foamed copper is ≥99.9% ， It has excellent electrical conductivity, can effectively reduce the resistance of photovoltaic modules, and improve the output power of photovoltaic modules.

[0030] The photovoltaic solder ribbon 1 includes a battery-facing surface 3 and a back battery surface 2 connected to the photovoltaic panel. A bonding surface for bonding with the photovoltaic panel is provided on the back battery surface 2.

[0031] A plurality of diagonal grooves 4 are opened on the battery-facing surface 3. The diagonal grooves 4 are arranged at equal intervals parallel to the extending direction of the photovoltaic solder ribbon 1. To improve the light multiplexing ability, the groove angle of the diagonal grooves 4 is set as an acute angle.

[0032] In the diagonal grooves 4, a plurality of convex blocks 5 are arranged at equal intervals. The convex blocks 5 are of a conical structure, preferably integrally formed with the diagonal grooves 4. The convex blocks 5 are light-reflecting blocks, and the distance between adjacent convex blocks 5 is between 4 - 10 mm.

[0033] By arranging a plurality of bumps 5 in the twill groove 4, after sunlight shines in, the light utilization rate is improved through multiple reflections of the bumps 5, thereby improving the efficiency of the photovoltaic module.

[0034] Compared with the V-groove structure, the arrangement of the bumps 5 can reflect sunlight multiple times, improving the light reflection reuse rate.

[0035] In this embodiment, at the position corresponding to the end of the photovoltaic solder ribbon 1 on the twill groove 4, a position for the coupling platform 6 is reserved, and the coupling platform 6 is installed at this position. The main body of the coupling platform 6 is a quadrilateral main body, and the coupling platform 6 is used for welding the battery cells or busbars.

[0036] The automatic string welding device uses a mechanical transmission mechanism to convey the battery cells, and uses the high-temperature gas of the hot air pipe to weld the battery cells on the heating bottom plate. When the photovoltaic solder ribbon 1 is welded to the battery cells or other components on the automatic string welding device, sufficient welding force is required and no false soldering should occur.

[0037] The photovoltaic solder ribbon 1 provided with the coupling platform 6 has the ability to reflect the surface reflected light back to the battery surface for reuse through the glass-air interface of the photovoltaic module, and perfectly solves the problems of high risk of backside false soldering and insufficient welding force on the surface of the twill groove 4 on the automatic string welding device.

[0038] By arranging the coupling platform 6, the technical problem of insufficient welding force is solved. The coupling platform 6 can be movably connected or welded. The coupling platform 6 is equivalent to a mounting rack. By arranging this coupling platform 6, some structures can be welded on the coupling platform 6, so that it is not necessary to weld on the photovoltaic solder ribbon 1. The coupling platform 6 is the actual place for welding the battery, preventing problems such as high risk of false soldering on the back silver surface, because direct welding of the twill groove 4 is not firm;

[0039] The connection method of the coupling platform 6 depends on the actual situation. If it is necessary to fix the battery for welding, the welding fixing method is adopted. If it is necessary to weld other components, the movable connection method can be adopted.

[0040] In this embodiment, a heat conduction strip coating 7 is provided on the surface of the twill groove. The function of the heat conduction strip coating 7 is heat conduction, to conduct out the excess heat in the solder ribbon. The thickness of the heat conduction strip coating 7 is 20 - 28 microns.

[0041] This embodiment also provides a photovoltaic module, which includes the photovoltaic solder ribbon in any of the above forms.

[0042] The above description of the proposed embodiments enables those skilled in the art to implement or use the present utility model. It should be understood that the features disclosed in the above embodiments, except in special circumstances, can be used alone or in combination. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model disclosed herein is not limited to the specific embodiments disclosed, but is intended to cover modifications within the spirit and scope of the present utility model as defined by the appended claims.

Claims

1. A photovoltaic solder ribbon, including a side facing away from the battery surface and a side facing towards the battery surface, characterized in that, The battery-facing surface is provided with diagonal grooves, and the diagonal grooves are provided with bumps. The photovoltaic solder ribbon is further provided with a coupling platform, and the coupling platform is used for welding battery cells or busbars.

2. The PV ribbon according to claim 1, wherein, The diagonal grooves are arranged at equal intervals parallel to the extending direction of the photovoltaic solder ribbon.

3. The photovoltaic soldering ribbon according to claim 1, wherein The coupling platform is arranged as a quadrilateral, and the coupling platform is integrally formed with the photovoltaic solder ribbon or welded on the surface of the photovoltaic solder ribbon.

4. The PV ribbon according to claim 1, wherein, The bumps are conical bumps.

5. The PV ribbon according to claim 4, wherein The bumps are integrally formed with the diagonal grooves.

6. The PV ribbon according to claim 4, wherein The bumps are arranged at equal intervals inside the diagonal grooves, and the interval between adjacent bumps is 4-10 mm.

7. The PV ribbon according to claim 1, wherein The surface of the diagonal grooves is provided with a heat-conducting coating.

8. The photovoltaic solder ribbon according to claim 1, wherein, The groove angle of the diagonal grooves is an acute angle.

9. A photovoltaic module, comprising the photovoltaic solder ribbon according to any one of claims 1-8.

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