Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly. The photovoltaic module comprises a photovoltaic tile and a heat insulation layer, the photovoltaic tile comprises a panel, a battery piece layer and a back plate which are sequentially stacked, the back plate is a metal plate, and the heat insulation layer is arranged on the side, away from the panel, of the back plate. According to the photovoltaic module provided by the embodiment of the invention, the heat insulation layer is arranged on the side, deviating from the panel, of the back plate, so that the heat accumulation in the battery piece layer can be increased, the power generation efficiency of the photovoltaic module is improved, the heat absorption of the roof can be reduced, the indoor heat preservation is realized, and the comfort of a house is improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Technology

[0002] With the increasing prominence of severe issues such as energy shortages and climate emissions, countries worldwide are paying more and more attention to clean, pollution-free renewable energy sources. Solar energy is an inexhaustible and green energy source. Currently, photovoltaic power generation has a wide range of applications, and building-integrated photovoltaics (BIPV) is gradually becoming a trend, with residential rooftops being the main application area for distributed photovoltaics. Among related technologies, photovoltaic modules have low power generation efficiency. Utility Model Content

[0003] This utility model provides a photovoltaic module.

[0004] The photovoltaic module of this application includes a photovoltaic tile and a heat insulation layer. The photovoltaic tile includes a panel, a cell layer and a back sheet stacked in sequence. The back sheet is a metal plate and the heat insulation layer is disposed on the side of the back sheet away from the panel.

[0005] In the photovoltaic module of this application embodiment, by providing a heat insulation layer on the side of the back sheet away from the panel, the heat accumulation in the cell layer can be increased, thereby improving the power generation efficiency of the photovoltaic module. It can also reduce roof heat absorption, insulate the interior, and thus improve the comfort of the house.

[0006] In some implementations, the photovoltaic module includes a frame, photovoltaic tiles, and an insulation layer disposed within the frame.

[0007] In some embodiments, the frame includes a frame body and a support flange connecting the frame body, the frame body and the support flange forming a mounting groove, in which the photovoltaic tile is located and abuts against the support flange.

[0008] In some embodiments, the support flange is provided with a through hole that extends through the support flange along its thickness and communicates with the mounting groove.

[0009] In some embodiments, the photovoltaic module includes a fastener, which includes a base, a connecting portion, and a fastening portion. The base and the fastening portion are respectively connected to opposite ends of the connecting portion. The base abuts against the frame, the connecting portion passes through the frame, the heat insulation layer, and the photovoltaic tile, and the fastening portion is fastened to the surface of the photovoltaic tile away from the base.

[0010] In some embodiments, the photovoltaic module includes a first encapsulating film layer located between the thermal insulation layer and the backsheet.

[0011] In some embodiments, the photovoltaic tile includes a second encapsulating film layer located between the cell layer and the backsheet.

[0012] In some embodiments, the photovoltaic tile includes a third encapsulating film layer located between the cell layer and the panel.

[0013] In some embodiments, the cell layer includes multiple cell strings connected in series, each cell string includes multiple cells, and all cells in each cell string are connected in series via solder strips.

[0014] In some embodiments, the solder strip includes a plurality of first solder segments and at least one second solder segment. The first solder segment is connected to a corresponding solar cell, and the second solder segment connects two adjacent first solder segments along a first direction. The second solder segment is located between two adjacent solar cells and spans the stacked area of ​​the two adjacent solar cells. The second solder segment is flat.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a three-dimensional schematic diagram of a photovoltaic module according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of a photovoltaic module according to an embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional schematic diagram of the fastener of the photovoltaic module according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the photovoltaic module according to an embodiment of the present invention when the front side is facing upwards;

[0022] Figure 6 This is a schematic diagram of the structure of the photovoltaic module with the back side facing up according to an embodiment of the present invention;

[0023] Figure 7 This is a side view of a photovoltaic module according to an embodiment of the present invention;

[0024] Figure 8 This is a partial schematic diagram of the welding strip according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 100, photovoltaic module; 10, photovoltaic tile; 11, panel; 12, cell layer; 121, cell string; 122, cell; 123, solder strip; 124, first welding section; 125, second welding section; 126, stacked area; 13, back sheet; 14, second encapsulation film layer; 15, third encapsulation film layer; 20, heat insulation layer; 30, frame; 31, frame body; 32, support flange; 33, mounting groove; 34, through hole; 40, fastener; 41, base; 42, connecting part; 43, fastening part; 50, first encapsulation film layer. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0031] Please see Figure 1 and Figure 2 The photovoltaic module 100 of the present application includes a photovoltaic tile 10 and a heat insulation layer 20. The photovoltaic tile 10 includes a panel 11, a cell layer 12 and a back sheet 13 stacked in sequence. The back sheet 13 is a metal plate and the heat insulation layer 20 is disposed on the side of the back sheet 13 away from the panel 11.

[0032] In the photovoltaic module 100 of this application embodiment, by providing a heat insulation layer 20 on the side of the back sheet 13 away from the panel 11, the heat accumulation in the cell layer 12 can be increased, thereby improving the power generation efficiency of the photovoltaic module 100. It can also reduce roof heat absorption, keep the interior warm, and thus improve the comfort of the house.

[0033] Specifically, a photovoltaic module 100 refers to a smallest indivisible photovoltaic cell assembly that has encapsulation and internal connections and can independently provide DC power output; it is a device that can convert light energy into electrical energy. Many materials can produce the photovoltaic effect, such as monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, and copper indium selenide. When light shines on the surface of the photovoltaic module 100, some photons are absorbed by the silicon material. The energy of the photons is transferred to silicon atoms, causing electrons to jump and become free electrons that accumulate on both sides of the PN junction, thus forming a potential difference. When an external circuit is connected, under the influence of this voltage, current will flow through the external circuit, generating a certain output power.

[0034] The solar cell layer 12 can receive light and convert solar energy into electrical energy. The front panel 11 is located on the front of the solar cell layer 12, and the back panel 13 is located on the back of the solar cell layer 12. The front of the solar cell layer 12 refers to the main light-receiving surface of the solar cell layer 12, and the back is the surface opposite to the front of the solar cell layer 12.

[0035] The panel 11 and backsheet 13 constitute the outermost layer of the photovoltaic module 100, serving to seal, insulate, and protect the cell layer 12, thereby improving the mechanical properties of the photovoltaic module 100. The panel 11 and backsheet 13 protect the cell layer 12 from damage caused by climate changes, such as high temperatures, low temperatures, rain, or hail. They also protect the cell layer 12 from damage during transportation due to collisions, effectively improving the photovoltaic module 100's ability to withstand harsh environments.

[0036] The insulation layer 20 can be made of insulation materials, including but not limited to XPS extruded polystyrene board, polyurethane foam, etc. The dimensions of the insulation layer 20 can be adapted to the dimensions of the back panel 13 so that the insulation layer 20 can insulate against heat entering the roof from the battery cell layer 12. The thickness of the insulation layer 20 can be designed according to actual needs.

[0037] Please see Figure 1 and Figure 3 In some embodiments, the photovoltaic module 100 includes a frame 30, photovoltaic tiles 10 and a heat insulation layer 20 disposed in the frame 30.

[0038] In this way, by setting the photovoltaic tile 10 and the heat insulation layer 20 in the frame 30, the photovoltaic module 100 can be formed as a whole, realizing the integration of the photovoltaic module 100 and making it easy to assemble and disassemble the photovoltaic module 100.

[0039] Specifically, the photovoltaic tile 10 has a rectangular plate-like structure. The frame 30 can be set at the edge of the photovoltaic tile 10 and is used to support the photovoltaic tile 10, which can reduce the impact on the photovoltaic tile 10. The frame 30 can be made of metal materials, including but not limited to iron, copper, aluminum, steel, etc. The material of the frame 30 can be the same as or different from the material of the back plate 13.

[0040] Please see Figure 3 In some embodiments, the frame 30 includes a frame 31 and a support flange 32 connecting the frame 31. The frame 31 and the support flange 32 form a mounting groove 33, in which the photovoltaic tile 10 is located and abuts against the support flange 32.

[0041] In this way, the supporting flange 32 can stably support the photovoltaic tile 10. In addition, the photovoltaic tile 10 is located in the mounting groove 33, so that the photovoltaic tile 10 will not protrude from the surface of the frame 30, which helps to reduce the impact on the photovoltaic tile 10 and improve the life of the photovoltaic module 100.

[0042] Specifically, the frame 31 is generally annular, and the supporting flange 32 extends from the inner edge of the frame 31 into the space enclosed by the frame 31. The supporting flange 32 can be annular. Of course, the supporting flange 32 can be sheet-like and there can be multiple supporting flanges 32, which can be arranged at intervals along the circumference of the frame 31. In order to improve the production efficiency of the frame 30, the frame 31 and the supporting flange 32 can be integrally formed.

[0043] Please see Figure 1 and Figure 3 In some embodiments, the support flange 32 is provided with a through hole 34, which extends through the support flange 32 along its thickness and communicates with the mounting groove 33.

[0044] Thus, the through-hole 34 can reduce the weight of the frame 30, making the photovoltaic module 100 easier to handle and increasing its applicability. In addition, the through-hole 34 can save material on the frame 30, reducing its production cost.

[0045] Specifically, the through hole 34 can be a regular shape such as square or circle, or it can be an irregular shape. The shape and size of the through hole 34 can be designed according to actual needs. The through hole 34 can be integrally formed when forming the frame 30, or it can be formed on the frame 30 by removing part of the material.

[0046] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, the photovoltaic module 100 includes a fastener 40, which includes a base 41, a connecting portion 42, and a fastening portion 43. The base 41 and the fastening portion 43 are respectively connected to opposite ends of the connecting portion 42. The base 41 abuts against the frame 30, the connecting portion 42 passes through the frame 30, the heat insulation layer 20, and the photovoltaic tile 10, and the fastening portion 43 is fastened to the surface of the photovoltaic tile 10 away from the base 41.

[0047] In this way, the latching part 43 and the base 41 can cooperate with each other, so that the photovoltaic tile 10 and the frame 30 can be latched between the latching part 43 and the base 41, thereby making the photovoltaic tile 10 and the frame 30 form a whole.

[0048] Specifically, the base 41 is plate-shaped. The base 41 can abut against the support flange 32 of the frame 30. The connecting part 42 is similar to a column, and the connecting part 42 can pass through the support flange 32 of the frame 30 and the photovoltaic tile 10. The snap-fit ​​part 43 is connected to one end of the connecting part 42 and protrudes laterally from the connecting part 42.

[0049] In one example, during the installation of the photovoltaic module 100, the photovoltaic tile 10 can be placed on the frame 30 first, and then the latching part 43 of the fastener 40 can pass through the frame 30 and the photovoltaic tile 10 from one side of the frame 30 in sequence, so that the latching part 43 is fastened to the surface of the photovoltaic tile 10, and the base 41 can abut against the surface of the frame 30, thereby completing the assembly between the frame 30 and the photovoltaic tile 10.

[0050] Please see Figure 2 In some embodiments, the photovoltaic module 100 includes a first encapsulating film layer 50, which is located between the heat insulation layer 20 and the backsheet 13.

[0051] Thus, the heat insulation layer 20 and the back sheet 13 can be connected and fixed by the first encapsulating film layer 50, allowing the heat insulation layer 20 and the photovoltaic tile 10 to form a whole, while simultaneously achieving lamination encapsulation of the heat insulation layer 20 and the photovoltaic tile 10, forming a stable and reliable structure. In addition, the first encapsulating film layer 50 can act as a buffer between the heat insulation layer 20 and the back sheet 13, preventing breakage during lamination. The first encapsulating film layer 50 can be made of one of EVA, POE, or EPE materials.

[0052] Please see Figure 2 In some embodiments, the photovoltaic tile 10 includes a second encapsulating film layer 60, which is located between the cell layer 12 and the backsheet 13.

[0053] Thus, the backsheet 13 and the cell layer 12 can be connected and fixed by the second encapsulating film layer 60, achieving lamination encapsulation of the backsheet 13 and the cell layer 12 to form a stable and reliable structure. In addition, the second encapsulating film layer 60 can act as a buffer between the backsheet 13 and the cell layer 12, preventing cell breakage during lamination. The second encapsulating film layer 60 is made of one of EVA, POE, or EPE materials. The materials of the first encapsulating film layer 40 and the second encapsulating film layer 60 can be the same or different.

[0054] Please see Figure 2 In some embodiments, the photovoltaic tile 10 includes a third encapsulating film layer 70, which is located between the cell layer 12 and the panel 11.

[0055] Thus, the battery cell layer 12 and the panel 11 can be connected and fixed by the third encapsulating film layer 70, achieving lamination and encapsulation of the battery cell layer 12 and the panel 11 to form a stable and reliable structure. In addition, the third encapsulating film layer 70 can act as a buffer between the battery cell layer 12 and the panel 11, preventing breakage during lamination. The third encapsulating film layer 70 is made of one of EVA, POE, or EPE materials. The materials of the second encapsulating film layer 60 and the third encapsulating film layer 70 can be the same or different.

[0056] Please see Figure 5 and Figure 6 In some embodiments, the battery cell layer 12 includes a plurality of battery strings 121 connected in series, each battery string 121 includes a plurality of battery cells 122, and all battery cells 122 in each battery string 121 are connected in series by solder ribbons 123.

[0057] In this way, connecting multiple solar cells 122 in series can improve the efficiency of the solar cell layer 12, thereby increasing the utilization rate of solar energy.

[0058] Specifically, the solar cell 122 is preferably one of the following: XBC, MWT, or shingled solar cells without metal grid lines, where both positive and negative metal electrodes are led out from the back side. A secondary preference is a solar cell with grid lines on both the front and back sides, such as PERC, TOPCON, or HJT. This maintains the consistency of the appearance of the solar cell layer 12, preventing the metal grid lines and metal electrodes from affecting the front appearance of the solar cell layer 12, thereby improving aesthetics.

[0059] Multiple solar cells 122 connected in series can be multiple complete solar cells 122 connected in series, multiple 1 / 2 solar cells 122 connected in series, multiple 1 / 3 solar cells 122 connected in series, or multiple 1 / 4 solar cells 122 connected in series.

[0060] In one embodiment, the battery cell layer 12 includes three battery strings 121 connected in series, and each battery string 121 consists of 12 half-cells 122 connected in series. The power range of the battery cell layer 12 is between 110W and 111W.

[0061] In another embodiment, the battery cell layer 12 includes 6 battery strings 121, 3 battery strings 121 are connected in series to form a battery string group, each battery string 121 is composed of 12 half battery cells 122 connected in series, and 2 battery string groups are connected in parallel. The power range of the battery cell layer 12 is between 130W and 211W.

[0062] The solder ribbon 123 is used to electrically connect multiple solar cells 122. The solder ribbon 123 can be made of conductive materials such as silver, tin, or alloys to improve its conductivity. The multiple solar cells 122 can be arranged in a flat or stacked manner.

[0063] Please see Figure 7 and Figure 8 In some embodiments, the solder strip 123 includes a plurality of first solder segments 124 and at least one second solder segment 125. The first solder segment 124 is connected to a corresponding battery cell 122. The second solder segment 125 connects two adjacent first solder segments 124 along a first direction D1. The second solder segment 125 is located between two adjacent battery cells 122 and spans the stacked region 126 of the two adjacent battery cells 122. The second solder segment 125 is flat.

[0064] Thus, the second welding segment 125 is located between two adjacent battery cells 122 and spans the stacked area 126 of the two adjacent battery cells 122. The second welding segment 125 is flat, which increases the contact area between the second welding segment 125 and the battery cell 122, reduces the pressure on the battery cell 122, and thus reduces defects such as cracks in the battery cell 122.

[0065] Specifically, the first welding segment 124 of the welding strip 123 can be welded to the battery cell 122, and the number of the second welding segments 125 is one less than the number of the first welding segments 124. For example, when there are two first welding segments 124, there is one second welding segment 125. The first welding segment 124 and the second welding segment 125 can be an integral structure.

[0066] The stacked region 126 of two adjacent battery cells 122 refers to the area where two adjacent battery cells 122 have overlapping areas. The second welding segment 125 spans the stacked region 126, meaning that the ends of the second welding segment 125 along the first direction D1 extend beyond the stacked region 126. The second welding segment 125 is flat, meaning that the width of the second welding segment 125 is greater than the height of the second welding segment 125.

[0067] It should be noted that the surface with the largest area of ​​the second welding section 125 faces or contacts the battery cell 122. The first direction D1 can be the direction in which all the battery cells 122 in each battery string 121 are arranged in series.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: A photovoltaic tile includes a panel, a layer of solar cells, and a back sheet stacked in sequence, wherein the back sheet is a metal plate; A heat insulation layer is disposed on the side of the back panel away from the front panel.

2. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module includes a frame, and the photovoltaic tiles and the heat insulation layer are disposed in the frame.

3. The photovoltaic module according to claim 2, characterized in that, The frame includes a frame body and a supporting flange connecting the frame body. The frame body and the supporting flange form a mounting groove, and the photovoltaic tile is located in the mounting groove and abuts against the supporting flange.

4. The photovoltaic module according to claim 3, characterized in that, The support flange is provided with a through hole, which extends through the support flange along its thickness and communicates with the mounting groove.

5. The photovoltaic module according to claim 2, characterized in that, The photovoltaic module includes a fastener, which includes a base, a connecting part, and a fastening part. The base and the fastening part are respectively connected to opposite ends of the connecting part. The base abuts against the frame, the connecting part passes through the frame, the heat insulation layer, and the photovoltaic tile, and the fastening part is fastened to the surface of the photovoltaic tile away from the base.

6. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module includes a first encapsulating film layer, which is located between the heat insulation layer and the backsheet.

7. The photovoltaic module according to claim 1, characterized in that, The photovoltaic tile includes a second encapsulating film layer, which is located between the battery cell layer and the backsheet.

8. The photovoltaic module according to claim 1, characterized in that, The photovoltaic tile includes a third encapsulating film layer, which is located between the battery cell layer and the panel.

9. The photovoltaic module according to claim 1, characterized in that, The battery cell layer includes multiple battery strings connected in series, each battery string includes multiple battery cells, and all the battery cells in each battery string are connected in series by solder ribbons.

10. The photovoltaic module according to claim 9, characterized in that, The welding strip includes a plurality of first welding segments and at least one second welding segment. The first welding segment is connected to a corresponding one of the battery cells. The second welding segment connects two adjacent first welding segments along a first direction. The second welding segment is located between two adjacent battery cells and spans the stacked area of ​​the two adjacent battery cells. The second welding segment is flat.

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