CN215418198U

CN215418198U - Two-sided reflection of light photovoltaic solder strip and photovoltaic module

Info

Publication number: CN215418198U
Application number: CN202121666992.3U
Authority: CN
Inventors: 肖锋
Original assignee: Suzhou Yourbest New Type Materlals Co ltd
Current assignee: Suzhou Yourbest New Type Materlals Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-01-04
Anticipated expiration: 2031-07-21

Abstract

The application discloses a photovoltaic welding strip and a photovoltaic assembly, the photovoltaic welding strip comprises at least one group of first welding strip unit, a connecting section and a second welding strip unit which are connected in sequence, the first welding strip unit is in a non-flat shape and is used for being connected with the front side of a photovoltaic cell, the second welding strip unit is in a flat shape and is used for being connected with the back side of the photovoltaic cell, the connecting section is arranged between two adjacent photovoltaic cells, a plurality of microstructures in preset shapes are arranged on the preset surface of the second welding strip unit, a groove is formed between every two microstructures, the microstructures and the surface of the groove are covered with a first light reflecting layer, light irradiating the preset surface can be reflected onto glass of the photovoltaic assembly and then onto the cell through the glass, the utilization rate of the light irradiating the back side of the cell is improved, the power of the photovoltaic assembly is improved, the second welding strip unit is arranged in a flat shape, the distance between the battery pieces is reduced, the weight of the packaging adhesive film on the back of the assembly is reduced, and meanwhile, the hidden crack of the battery pieces can be reduced.

Description

Two-sided reflection of light photovoltaic solder strip and photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaics, in particular to a double-sided light-reflecting photovoltaic welding strip and a photovoltaic module.

Background

The photovoltaic module (also called solar panel) is a core part of a solar power generation system and is also the most important part of the solar power generation system, and the photovoltaic module has the function of converting solar energy into electric energy and sending the electric energy to a storage battery for storage or pushing a load to work. The photovoltaic module at least comprises a plurality of cell strings and a bus bar for connecting the cell strings together, wherein the cell strings are generally formed by connecting a plurality of photovoltaic cell sheets and solder strips, and the cell strings and the bus bar are also connected through the solder strips.

In order to further increase the power of the photovoltaic module, reduce the cell pitch, and reduce the single watt cost of the module, there is a micro-pitch module produced in mass in the market, wherein the solder ribbon welded to the front surface of the battery is different from the solder ribbon welded to the back surface of the battery in appearance, the width of the solder strip on the front side of the battery is narrower, so that the light shielding of the solder strip is reduced, the light irradiated on the surface of the solder strip is reflected to the glass as much as possible and then reflected back to the battery plate through the glass, the light utilization rate is improved, the front side power of the component is increased, the solder strips on the back of the battery are relatively wide and thin, are generally flat and have no special shape, so that the purpose is to reduce the distance between the sheets and the weight of the packaging adhesive film on the back of the assembly, meanwhile, the hidden crack of the battery piece can be reduced, but the arrangement cannot improve the back power of the assembly.

With the spread of the bifacial battery, the power on the back side of the module (usually expressed as bifacial rate) is also the focus of attention. Aiming at the problem, in the prior art, the welding strip on the back of the battery is made into a circle, a semicircle, an ellipse, a triangle and the like, but the welding strip is thicker, the power of the back is possibly improved, but the original advantage of being made into a flat shape is lost, the purpose of reducing the cost of the assembly cannot be realized, and the hidden danger of hidden cracking of the battery piece exists.

Therefore, it is desirable to provide a new photovoltaic solder strip structure to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiment of the utility model provides a double-sided reflective photovoltaic solder strip and a photovoltaic module.

In order to achieve the above purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a photovoltaic solder strip which comprises at least one group of first solder strip unit, a connecting section and a second solder strip unit which are sequentially connected, wherein the first solder strip unit is in a non-flat shape and is used for being connected with the front side of a photovoltaic cell, the second solder strip unit is in a flat shape and is used for being connected with the back side of the photovoltaic cell, the connecting section is arranged between two adjacent photovoltaic cells, the photovoltaic solder strip further comprises a plurality of microstructures in a preset shape, the microstructures are arranged on the preset surface of the second solder strip unit, a groove is formed between every two microstructures, the microstructures and the groove surface are covered with a first light reflecting layer, and the first light reflecting layer is used for reflecting light rays irradiated to the preset surface.

Further, the preset shape includes at least one of a triangle, a semicircle, a circular arc, or a trapezoid.

Further, when the preset shape is a triangle or a trapezoid, the microstructures form an included angle of a preset angle.

Further, the first light reflecting layer comprises one of a welding material, a light reflecting film or a light reflecting coating.

Further, when the first reflective layer is made of solder, the first reflective layer covered on the surface of the groove has a preset thickness.

Further, the plurality of microstructures are arranged on the preset surface in parallel.

Furthermore, the first welding strip unit at least comprises a first base body and a second reflecting layer covering the surface of the first base body, and when the photovoltaic welding strip is connected with the photovoltaic cell, the second reflecting layer can reflect light rays incident to the surface of the photovoltaic welding strip.

Further, the cross section of the first substrate is circular, semicircular, elliptical, trapezoidal, triangular, or any one of two sides of the trapezoid having an arc shape, two sides of the triangle having an arc shape, the trapezoid having a square base, the semicircle having a square base, or the triangle having a square base.

Further, the second solder strip unit comprises a second base body and a solder layer covering the other surface of the second base body except the preset surface.

In a second aspect, the utility model provides a photovoltaic module, which includes at least one cell string and a bus bar, where the cell string includes a plurality of photovoltaic cells and at least one photovoltaic solder strip, the cell string is connected to the bus bar through the photovoltaic solder strip, the first solder strip unit of the photovoltaic solder strip is connected to the front sides of the photovoltaic cells, the second solder strip unit is connected to the back sides of the photovoltaic cells, the connecting section is disposed between two adjacent photovoltaic cells, and the first reflective layer of the photovoltaic solder strip is used for reflecting light irradiated onto a predetermined surface of the second solder strip unit.

Further, the photovoltaic cell piece comprises a double-sided cell piece.

Further, the packaging material on the back of the photovoltaic module is a transparent material.

Further, the transparent material includes one of glass or high molecular polymer.

Furthermore, the inter-slice distance of the photovoltaic cell slices is-5 mm to 5 mm.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects:

the double-sided reflecting photovoltaic solder strip and the photovoltaic module provided by the embodiment of the utility model are characterized in that the photovoltaic solder strip comprises at least one group of first solder strip unit, a connecting section and a second solder strip unit which are connected in sequence, the first solder strip unit is in a non-flat shape and is used for being connected with the front side of a photovoltaic cell, the second solder strip unit is in a flat shape and is used for being connected with the back side of the photovoltaic cell, the connecting section is arranged between two adjacent photovoltaic cells, the photovoltaic solder strip also comprises a plurality of microstructures in a preset shape which are arranged on the preset surface of the second solder strip unit, a groove is formed between every two microstructures, the microstructures and the surface of the groove are covered with a first reflecting layer, the first reflecting layer is used for reflecting light rays irradiated on the preset surface, on one hand, the light rays irradiated on the preset surface of the photovoltaic solder strip can be reflected to the glass of the photovoltaic module through the first reflecting layer, the second solder strip unit is arranged in a flat shape, so that the welding area of the second solder strip unit and the battery piece is increased, the falling off is avoided, the piece spacing can be reduced, the weight of a packaging adhesive film on the back of the assembly is reduced, and meanwhile, the hidden crack of the battery piece can be reduced;

further, according to the double-sided reflective photovoltaic solder strip and the photovoltaic module provided by the embodiment of the utility model, the microstructure and the surface of the groove are covered with the first reflective layer, the first reflective layer comprises the solder, the solder is used for reflecting light, and the photovoltaic solder strip has a welding function and a reflective function at the same time with high efficiency and low cost under the conditions that no new material is introduced and the production process of the module end is not changed, so that the production cost is reduced, and the power of the photovoltaic module is improved;

further, according to the double-sided reflective photovoltaic solder strip and the photovoltaic module provided by the embodiment of the utility model, the first solder strip unit at least comprises the first substrate and the second reflective layer covering the surface of the first substrate, when the photovoltaic solder strip is connected with the photovoltaic cell, the second reflective layer can reflect light incident on the surface of the photovoltaic solder strip, and the light incident on the photovoltaic solder strip is reflected by the first reflective layer, so that the shielding of the solder strip on the cell is reduced, the utilization rate of light on the front surface of the cell is improved, and the power of the photovoltaic module is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a double-sided reflective photovoltaic solder strip provided in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a double-sided reflective photovoltaic solder strip provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a first solder strip unit provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a second solder strip unit provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a photovoltaic module provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The photovoltaic solder strip of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the double-sided reflective photovoltaic solder strip provided by the embodiment of the utility model includes at least one group of first solder strip units 100, a connecting section 200, a second solder strip unit 300, a plurality of microstructures 400 in a preset shape, a groove 500 formed between every two microstructures 400, and a first reflective layer 600. The first solder strip unit 100 is non-flat, the second solder strip unit 300 is flat, and the connecting section 200 is disposed between the first solder strip unit 100 and the second solder strip unit 300. The second solder strip unit 300 is arranged to be flat, so that on one hand, the welding area of the second solder strip unit and the battery piece can be increased, the second solder strip unit is prevented from falling off, on the other hand, the piece spacing can be reduced, the weight of a packaging adhesive film on the back of the assembly is reduced, and meanwhile, the problem of hidden cracking of the battery piece can be reduced. It should be noted that the first light reflecting layer 600 shown in the figures is an exemplary illustration and does not represent the actual thickness of the first light reflecting layer 600.

As further shown in fig. 1 and 2, a plurality of microstructures 400 having a predetermined shape are disposed on a predetermined surface of the second solder ribbon unit, including but not limited to an opposite surface of the second solder ribbon unit connected to the photovoltaic cell sheet. The microstructures 400 form protrusions on a predetermined surface, so that a groove 500 is formed between every two microstructures 400. The first light reflecting layer 600 covers the surface of the microstructure 400 and the grooves 500. When the photovoltaic solder strip is connected with the photovoltaic cell pieces and a plurality of photovoltaic cell pieces are connected into a cell string, the first solder strip unit 100 is connected with the front side of each photovoltaic cell piece, the second solder strip unit 300 is connected with the back side of each photovoltaic cell piece, and the connecting section 200 is arranged between every two adjacent photovoltaic cell pieces. As a preferred example, the first solder ribbon unit 100 is connected to a front grid of the photovoltaic cell, and the second solder ribbon unit 300 is connected to a back grid of the photovoltaic cell. The first reflecting layer can reflect light irradiated to the preset surface to the glass of the photovoltaic module, and then the light is reflected to the cell piece through the glass, so that the utilization rate of the light irradiated to the back of the cell piece is improved, and the power of the photovoltaic module is improved. It should be noted that in the embodiments of the present application, the front side of the photovoltaic cell refers to a side of the photovoltaic cell directly irradiated by light when the photovoltaic cell is in an operating state, and the back side of the photovoltaic cell refers to a side opposite to the side directly irradiated by light.

In the present embodiment, at least a portion of the structure of the connecting segment 200 is non-flat. When the photovoltaic solder strip is connected with the photovoltaic cell, the connecting section 200 is disposed between two adjacent photovoltaic cells. Because the first solder strip unit 100 is in a non-flat shape, the second solder strip unit 300 is in a flat shape, and a connecting section 200 with at least part of the structure in a non-flat shape is arranged between the first solder strip unit 100 and the second solder strip unit 300, the problems of fracture and the like caused by abrupt change of the section at the joint of the first solder strip unit 100 and the second solder strip unit 300 can be prevented. It should be noted that the connecting segment 200 in the embodiment of the present invention may also be made into other shapes according to actual requirements, and is not limited herein.

In the present embodiment, the connecting segment 200 includes a third substrate and a coating layer covering the surface of the third substrate. The coating layer covering the surface of the third substrate may be solder, or may be other types of coating layers, and is not limited herein. The coating covering the surface of the third substrate can reflect the light irradiated on the surface of the connecting section 200 to the glass of the photovoltaic module, and then the light is reflected to the cell sheet through the glass, so that the utilization rate of the light is improved.

As further shown in fig. 2, the microstructure 400 may be press-formed on the preset surface of the second solder strip unit by means of a press roller. The microstructure 400 has a predetermined shape, wherein the predetermined shape includes but is not limited to at least one of a triangle, a semicircle, a circular arc, or a trapezoid. During specific implementation, if the microstructure 400 is triangular, the vertex angle that can set up the triangle shape has a preset radian, and if the microstructure 400 is trapezoidal, two trapezoidal vertex angles can be set up to have a preset radian. In order to enable light irradiated to the preset surface to be reflected onto the glass of the photovoltaic module according to a certain angle through the first light reflecting layer 600 covering the surface of the microstructures 400 and then reflected onto the cell sheet through the glass, when the preset shape is a triangle or a trapezoid, included angles of the preset angle are formed between the microstructures 400, and preferably, the included angles between the microstructures 400 have a preset radian. In order to maximize the reflected light and minimize the reflection distance of the light during reflection and the loss, the predetermined angle may be set to be between 90 ° and 150 °, preferably between 120 ° and 130 ° in the embodiment of the present application.

As further shown in fig. 2, in order to enable the light irradiated on the predetermined surface to be reflected onto the glass of the photovoltaic module at an angle through the first light reflecting layer 600 covering the surface of the groove 500 and then reflected onto the cell sheet through the glass, and in order to maximize the reflected light and minimize the reflection path and loss of the light during the reflection process, in the embodiment of the present application, the depth of the groove 500 may be set to be between 15 μm and 50 μm, preferably 25 μm and 35 μm. Therefore, the phenomenon that the light reflection amount is small due to too shallow depth of the groove 500, or the pressing roller is easy to wear and waste solder due to too deep depth of the groove 500 can be avoided, and the total thickness of the photovoltaic welding strip is increased, so that the assembly packaging is not facilitated, and the like.

The first light reflecting layer 600 includes, but is not limited to, one of solder, a light reflecting film, or a light reflecting coating. Preferably, the first light reflecting layer 600 is solder. The first reflecting layer 600 is made of the solder, so that the photovoltaic welding strip has a reflecting function at high efficiency and low cost under the conditions that no new material is introduced and the production process of the assembly end is not changed, the production cost is reduced, and the power of the photovoltaic assembly is improved. It should be noted here that the solder includes, but is not limited to, a tin-lead alloy and other metal solders, and the reflective coating may be a dielectric material, including, but not limited to, a polymer or a ceramic material, so as to ensure the conductivity of the photovoltaic solder strip.

As the thickness of the first light reflecting layer 600 on the surface of the groove 500 may affect the light reflecting effect, and generally, the smaller the thickness of the first light reflecting layer 600 is, the better the light reflecting effect is, as a preferred embodiment, in this embodiment of the present application, the first light reflecting layer 600 on the surface of the groove 500 is set to be a preset thickness, and preferably, the thickness of the first light reflecting layer 600 on the surface of the groove 500 is set to be less than or equal to 5 μm.

As a preferred embodiment, in the present embodiment, a plurality of microstructures 400 may be disposed on the predetermined surface in parallel, and in this case, a plurality of grooves 500 formed between every two microstructures 400 are also parallel to each other. The microstructure 400 can be parallel to the length direction of the photovoltaic solder strip, and straight grains are formed on the preset surface, or the microstructure 400 can form a certain angle with the length direction of the photovoltaic solder strip, and diagonal grains are formed on the preset surface. When the microstructures 400 are arranged to be parallel to the length direction of the photovoltaic solder strip and straight lines are formed on the preset surface, hot dipping can be achieved by the mainstream process of solder strip production, and the efficiency is high, the cost is low; when the length direction that sets up micro-structure 400 and photovoltaic solder strip becomes certain angle, when predetermineeing the surface and form the twill, can use electroplating process to realize, though the cost is higher, can't realize large-scale production, the actual outdoor generated energy of the photovoltaic module who uses the twill scheme can be higher. Thus, the user can make a selection according to actual needs.

As shown in fig. 3, the first solder strip unit 100 includes a first substrate 110 and a second light reflecting layer 120 covering a surface of the first substrate 110. The substrate of the first base 110 includes, but is not limited to, a copper substrate. In the cross section, the cross section of the first substrate 110 is circular, semicircular, elliptical, trapezoidal, triangular, one of the two sides of the trapezoid having arc shape, the two sides of the triangle having arc shape, the trapezoid with square base, the semicircle with square base or the triangle with square base, so as to reduce the shielding of the welding strip on the battery piece and improve the light utilization rate. The first substrate 110 includes an engaging surface and a light reflecting surface. The surface of the joint surface is covered with a solder layer for connecting with the photovoltaic cell. The surface of the joint surface is covered with a solder layer including, but not limited to, a tin-lead alloy or other metal solder, so as to ensure the conductivity of the joint surface. The joint surface is preferably a plane, so that the welding area of the joint surface and the photovoltaic cell is increased, and the reliability of connection is ensured. The reflective surface is used to cover the second reflective layer 120, and the second reflective layer 120 includes, but is not limited to, solder, reflective film or reflective coating. The second reflecting layer 120 can reflect the light incident to the surface of the photovoltaic welding strip, so that the shielding of the welding strip on the cell is reduced, the light utilization rate is improved, and the power of the photovoltaic module is improved.

As shown in fig. 4, the second solder ribbon unit 300 includes a second base 310 and a solder layer 320 covering the other surface of the second base 310 except for a predetermined surface. The substrate of the second base 310 includes, but is not limited to, a copper substrate. The solder of the solder layer 320 includes, but is not limited to, tin-lead alloy, such as Sn60Pb 40. When the photovoltaic solder strip is connected with the photovoltaic cell, the second solder strip unit 300 is flat, so that on one hand, the welding area between the second solder strip unit 300 and the photovoltaic cell can be increased, the welding between the second solder strip unit 300 and the photovoltaic cell is firmer, and the connection reliability is ensured, on the other hand, the distance between the photovoltaic cell and the photovoltaic cell can be reduced, the weight of a package adhesive film on the back of the assembly can be reduced, and meanwhile, the subfissure of the photovoltaic cell can be reduced.

Fig. 5 is a schematic structural diagram of a photovoltaic module provided by an embodiment of the present invention, and referring to fig. 5, the photovoltaic module includes at least one cell string and a bus bar, the cell string includes a plurality of photovoltaic cell pieces 700, and at least one photovoltaic solder strip. The cell string is connected to the bus bar 800 by a photovoltaic solder strip. The first solder strip unit 100 of the photovoltaic solder strip is connected with the front side of the plurality of photovoltaic cell pieces 700, the second solder strip unit 300 of the photovoltaic solder strip is connected with the back side of the plurality of photovoltaic cell pieces 700, the connecting section 200 is arranged between the two adjacent photovoltaic cell pieces 700, and the first reflective layer of the photovoltaic solder strip is used for reflecting light irradiated on the preset surface of the second solder strip unit.

In the embodiment of the present application, the photovoltaic cell sheet includes a double-sided cell sheet.

As a preferred embodiment, in the embodiment of the present application, the encapsulant on the back surface of the photovoltaic module is a transparent material.

Specifically, when the photovoltaic cell of the photovoltaic module is a single-sided cell, the encapsulant on the back side of the photovoltaic module is usually made of a non-transparent material, and when the photovoltaic cell is a double-sided cell, the encapsulant on the back side of the photovoltaic module can be made of a transparent material, including but not limited to glass, high molecular polymer, etc., in consideration of the power on the back side of the module.

As a preferred embodiment, in the present application example, the inter-cell distance of the photovoltaic cell may be a normal distance, a fine distance, a negative distance, or the like. Preferably, the photovoltaic cell sheet in the embodiment of the present application has a sheet pitch of 5mm to 5mm, where "-" represents a negative number.

In the description of the present invention, it is to be understood that the terms "X axis", "Y axis", "Z axis", "vertical", "parallel", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a two-sided reflection of light photovoltaic solder strip, its characterized in that, photovoltaic solder strip includes at least a set of first solder strip unit, linkage segment and the second solder strip unit that connects gradually, first solder strip unit is non-flat shape for be connected with photovoltaic cell piece's front, the second solder strip unit is flat shape, be used for with photovoltaic cell piece's back connection, the linkage segment sets up in adjacent two between the photovoltaic cell piece, photovoltaic solder strip still including set up in a plurality of microstructures that are preset shape on the second solder strip unit predetermines on the surface, per two form the slot between the microstructure, the microstructure and the slot surface covers there is first reflection of light layer, first reflection of light layer is used for will shine predetermine surperficial light and reflect.

2. The double-sided reflective photovoltaic solder strip of claim 1, wherein the predetermined shape comprises at least one of a triangle, a semicircle, a circular arc or a trapezoid.

3. The double-sided reflective photovoltaic solder strip of claim 2, wherein when the predetermined shape is a triangle or a trapezoid, the microstructures form a predetermined angle therebetween.

4. The double-sided reflective photovoltaic solder ribbon of any one of claims 1 to 3, wherein the first reflective layer comprises one of solder, reflective film or reflective coating.

5. The double-sided reflective photovoltaic solder strip according to claim 4, wherein when the first reflective layer is solder, the first reflective layer covered on the surface of the groove has a predetermined thickness.

6. The double-sided light-reflecting photovoltaic solder strip according to any one of claims 1 to 3, wherein the plurality of microstructures are arranged in parallel with each other on the predetermined surface.

7. The double-sided reflective photovoltaic solder strip according to any one of claims 1 to 3, wherein the first solder strip unit comprises at least a first substrate and a second reflective layer covering a surface of the first substrate, and the second reflective layer reflects light incident on the surface of the photovoltaic solder strip when the photovoltaic solder strip is connected to the photovoltaic cell.

8. The double-sided reflective photovoltaic solder strip of claim 7, wherein the cross-section of the first substrate is one of circular, semicircular, elliptical, trapezoidal, triangular, with both sides of the trapezoid having arcs, with both sides of the triangle having arcs, with a trapezoid having a square base, with a semicircle having a square base, or with a triangle having a square base.

9. The double-sided reflective photovoltaic solder ribbon according to any one of claims 1 to 3, wherein the second solder ribbon unit comprises a second substrate and a solder layer covering the other surface of the second substrate except the predetermined surface.

10. A photovoltaic module, characterized in that, the photovoltaic module includes at least one battery string and busbar, the battery string includes a plurality of photovoltaic cells piece, and at least one photovoltaic solder strip of any one of claims 1-9, the battery string passes through the photovoltaic solder strip and is connected with the busbar, the first solder strip unit of photovoltaic solder strip with the front of a plurality of photovoltaic cells piece is connected, the second solder strip unit with the back of a plurality of photovoltaic cells piece is connected, the linkage segment sets up between two adjacent photovoltaic cells piece, the first reflector layer of photovoltaic solder strip is used for will shining the reflection of light on the preset surface of second solder strip unit.

11. The photovoltaic module of claim 10, wherein the photovoltaic cell sheet comprises a bifacial cell sheet.

12. The photovoltaic module according to claim 10 or 11, wherein the encapsulant on the back side of the photovoltaic module is a transparent material.

13. The photovoltaic module of claim 12, wherein the transparent material comprises one of glass or a high molecular polymer.

14. The photovoltaic module of claim 10 or 11, wherein the photovoltaic cells have a pitch of-5 mm to 5 mm.