A BIPV photovoltaic device

Abstract

The utility model discloses a kind of BIPV photovoltaic devices, including light-transmitting first bearing plate group, battery assembly, curved conductive sheet and light-transmitting or non-light-transmitting second bearing plate group;Battery assembly includes at least one battery string, the battery string includes multiple cell pieces, multiple the cell piece is successively connected in series and is arranged along the length direction of the battery string, curved conductive sheet is set between two adjacent cell pieces, the first end of the conductive sheet is connected with the front electrode layer of one of the cell piece, the tail end of the conductive sheet is connected with the back electrode layer of another cell piece, first bearing plate group, battery assembly and second bearing plate group are sequentially stacked, wherein, at the position corresponding with conductive sheet, first bearing plate group has first light shielding part and / or first refractive part, the design structure is compact, guarantees photoelectric conversion efficiency, appearance is beautiful, reliable in use.

Description

Technical Field

[0001] This utility model relates to the field of solar cell equipment technology, and in particular to a BIPV photovoltaic device. Background Technology

[0002] With the continued growth of global energy demand and the advancement of "dual carbon" goals, Building Integrated Photovoltaics (BIPV) technology, as a solution that deeply integrates solar power generation with building structures, has received widespread attention in recent years. BIPV modules not only need to possess the power generation function of traditional photovoltaic modules, but also need to meet the comprehensive requirements of buildings for light transmission, aesthetics, structural strength, and durability.

[0003] Existing BIPV photovoltaic installations typically include stacked transparent glass panels and battery modules. The battery modules have battery strings, which consist of multiple crystalline silicon cells connected in series. Adjacent cells are connected by conductive strips, which are visible to the user through the transparent glass panel. The conductive strips differ in color from the cells themselves, limiting the aesthetics of the BIPV installation. If the thickness of the conductive strips is increased, the internal resistance between the cells increases, resulting in significant energy loss and low photoelectric conversion efficiency. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a BIPV photovoltaic device that is compact in structure, ensures high photoelectric conversion efficiency, has an attractive appearance, and is reliable in use.

[0005] A BIPV photovoltaic device according to a first aspect of the present invention includes: a light-transmitting first support plate assembly; a battery module including at least one battery string, the battery string including multiple battery cells, the multiple battery cells being connected in series and arranged along the length direction of the battery string; a curved conductive sheet disposed between two adjacent battery cells, the first end of the conductive sheet being connected to the front electrode layer of one of the battery cells, and the tail end of the conductive sheet being connected to the back electrode layer of the other battery cell; and a light-transmitting or opaque second support plate assembly, wherein the first support plate assembly, the battery module, and the second support plate assembly are stacked in sequence, wherein, at a position corresponding to the conductive sheet, the first support plate assembly has a first light-shielding portion and / or a first refractive portion.

[0006] A BIPV photovoltaic device according to an embodiment of the present invention has at least the following beneficial effects:

[0007] This utility model relates to a BIPV photovoltaic device. A curved conductive sheet connects the front electrode layer of one solar cell to the back electrode layer of the other between two adjacent solar cells, achieving series connection of the two cells. The conductive sheet has a sheet-like structure, reducing the internal resistance of the conductor and thus improving the photoelectric conversion efficiency of the BIPV photovoltaic device. A first light-transmitting support plate assembly has a first light-shielding part and / or a first refractive part at a position corresponding to the conductive sheet, making the conductive sheet difficult for the user to see from the outside. This design is compact, ensures high photoelectric conversion efficiency, has an aesthetically pleasing appearance, and is reliable in use.

[0008] According to some embodiments of the present invention, the second carrier plate assembly is light-transmitting, and the second carrier plate assembly has a second light-shielding part or a second refractive part at the position corresponding to the conductive sheet.

[0009] According to some embodiments of the present invention, a main grid strip is provided at the edge of the front electrode layer and / or the back electrode layer of the battery cell. The main grid strip is connected to multiple fine grid strips on the corresponding front electrode layer or the back electrode layer, and the main grid strip is connected to the conductive sheet.

[0010] According to some embodiments of this utility model, the conductive sheet is in the shape of a "Z".

[0011] According to some embodiments of the present invention, the conductive sheet extends along the edges of the battery cell on both sides.

[0012] According to some embodiments of the present invention, the first carrier plate assembly includes the light-transmitting first panel and the elastic first adhesive film. The first panel, the first adhesive film and the battery assembly are stacked in sequence. The first panel has a light-shielding sheet on the side surface near the first adhesive film to form the first light-shielding part.

[0013] According to some embodiments of the present invention, the width of the light-shielding sheet along the length direction of the battery string is greater than or equal to the spacing between two adjacent battery cells.

[0014] According to some embodiments of the present invention, a refractive surface is provided in the first panel, or a refractive sheet is provided on the surface of the first panel facing away from the first adhesive film, and the refractive surface or the refractive sheet can refract light from the surface of the battery cell to the outside.

[0015] According to some embodiments of the present invention, the width of the refracting surface or the refracting sheet along the length direction of the battery string is greater than or equal to the spacing between two adjacent battery cells.

[0016] According to some embodiments of the present invention, the first carrier plate assembly includes the light-transmitting first panel and the elastic first adhesive film. The first panel, the first adhesive film and the battery assembly are stacked in sequence. The first panel is provided with a refractive surface, or the first panel is provided with a refractive sheet on the side surface opposite to the first adhesive film. The refractive surface or the refractive sheet can refract light from the surface of the battery cell to the outside.

[0017] 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

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a top view of the battery module and conductive sheet of one embodiment of the BIPV photovoltaic system of this utility model;

[0020] Figure 2 This is a three-dimensional schematic diagram of one embodiment of the conductive sheet;

[0021] Figure 3 This is a top view of one embodiment of the first panel or the second panel;

[0022] Figure 4 This is a cross-sectional view of one embodiment of the BIPV photovoltaic system of this utility model.

[0023] Figure label:

[0024] First carrier plate assembly 100; first panel 110; first adhesive film 120; battery assembly 200; main grid 210; fine grid 220; conductive sheet 300; second carrier plate assembly 400; second panel 410; second adhesive film 420; refractive surface 500; light shield 600. Detailed Implementation

[0025] 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.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1 to 4 As shown, a BIPV photovoltaic device according to a first aspect embodiment of the present invention includes a light-transmitting first support plate group 100, a battery module 200, a curved conductive sheet 300, and a light-transmitting or opaque second support plate group 400. The battery module 200 includes at least one battery string, the battery string including multiple battery cells, the multiple battery cells being connected in series and arranged along the length direction of the battery string. The curved conductive sheet 300 is disposed between two adjacent battery cells, the first end of the conductive sheet 300 being connected to the front electrode layer of one of the battery cells, and the tail end of the conductive sheet 300 being connected to the back electrode layer of the other battery cell. The first support plate group 100, the battery module 200, and the second support plate group 400 are stacked in sequence. At the position corresponding to the conductive sheet 300, the first support plate group 100 has a first light-shielding part and / or a first refractive part.

[0030] The solar cell can be a crystalline silicon heterojunction solar cell, which typically includes, from top to bottom, a front electrode layer, a TCO, an n-type doped amorphous silicon layer (n-a-Si:H), an intrinsic amorphous silicon layer (i-a-Si:H), a crystalline silicon substrate, an intrinsic amorphous silicon layer (i-a-Si:H), a p-type doped amorphous silicon layer (p-a-Si:H), a TCO, and a back electrode layer. The back electrode layer can be set as the positive electrode, while the front electrode layer can be set as the negative electrode.

[0031] The conductive sheet 300 can be made of metals or alloys such as copper and tin. Multiple battery strings can be arranged in the battery assembly 200, with the multiple battery strings arranged side by side.

[0032] The first light-shielding part can be directly facing the location of the conductive sheet 300 to block the light at the location of the conductive sheet 300, while the first refractive part can refract the light so that the user sees the surface of the battery cell. Both can form a shielding effect on the conductive sheet 300.

[0033] This utility model of BIPV photovoltaic device connects the front electrode layer of one solar cell and the back electrode layer of the other solar cell in series by using a bent conductive sheet 300 between two adjacent solar cells. The conductive sheet 300 has a sheet-like structure, which reduces the internal resistance of the conductor, thereby improving the photoelectric conversion efficiency of the BIPV photovoltaic device. The light-transmitting first carrier plate group 100 is provided with a first light-shielding part and / or a first refractive part at the position corresponding to the conductive sheet 300, so that the conductive sheet 300 is not easily visible to the user from the outside. This design has a compact structure, ensures photoelectric conversion efficiency, has an aesthetic appearance, and is reliable in use.

[0034] In some embodiments of this utility model, the second carrier plate group 400 is light-transmitting, and the second carrier plate group 400 has a second light-shielding part or a second refractive part at the position corresponding to the conductive sheet 300.

[0035] The second carrier plate assembly 400 can be made of an opaque material, so there is no need to set a second light-shielding part or a second refractive part. The second carrier plate assembly 400 can also block the position of the conductive sheet 300.

[0036] As for the second carrier plate assembly 400 made of light-transmitting material, it can have a second light-shielding part or a second refractive part at the position corresponding to the conductive sheet 300, so that the user cannot easily see the conductive sheet 300 from the outside.

[0037] In some embodiments of this utility model, a main grid bar 210 is provided at the edge of the front electrode layer and / or the back electrode layer of the battery cell. The main grid bar 210 is connected to multiple fine grid bars 220 on the corresponding front electrode layer or the back electrode layer. The main grid bar 210 is connected to the conductive sheet 300.

[0038] The fine grid line 220 of a photovoltaic cell is an important component of the metallized electrode on the surface of the cell. Its main function is to efficiently collect photogenerated carriers (electrons or holes) and transport them to external circuits.

[0039] Main grid bars 210 can be provided on both the front electrode layer and the back electrode layer of the solar cell. Fine grid bars 220 on the front electrode layer or the back electrode layer can be connected to the main grid bars 210. Current flows to the main grid bars 210 and then into the conductive sheet 300, reducing internal resistance and improving the photoelectric conversion efficiency of the photovoltaic device.

[0040] In some embodiments of this utility model, such as Figure 1 , 2 As shown in Figure 4, the conductive sheet 300 is Z-shaped. The first end face of the conductive sheet 300 can be attached to the front electrode layer of one of the solar cells. The surface-to-surface contact can ensure a sufficiently large contact area. Similarly, the tail end face of the conductive sheet 300 is attached to the back electrode layer of another solar cell. The surface-to-surface contact can ensure a sufficiently large contact area, reduce internal resistance, and improve the photoelectric conversion efficiency of the photovoltaic device.

[0041] In some embodiments of this utility model, the conductive sheet 300 extends along the edges of the battery cell on both sides. It can be understood that the conductive sheet 300 can be rectangular, and two adjacent conductive sheets 300 are joined at the edge position. Therefore, the conductive sheet 300 also extends along the length direction of the edge of the battery cell, which can ensure that the conductive sheet 300 has sufficient current-conducting area and reduce internal resistance.

[0042] In some embodiments of this utility model, such as Figure 4 As shown, the first carrier plate assembly 100 includes the light-transmitting first panel 110 and the elastic first adhesive film 120. The first panel 110, the first adhesive film 120 and the battery assembly 200 are stacked in sequence. The first panel 110 has a light-shielding sheet 600 on one side surface near the first adhesive film 120 to form the first light-shielding part.

[0043] The first adhesive film 120 has a certain elasticity. Since the conductive sheet 300 is stacked on the edge of the battery cell, adding the first adhesive film 120 between the first panel 110 and the battery cell can improve the adhesion performance. At the same time, rigid pressure will not be generated at the stacking position, which would cause damage to the first panel 110 or the battery cell. Specifically, the first panel 110 can be single-coated or double-coated patterned glass, and can be semi-tempered or fully tempered.

[0044] Similarly, in an embodiment of the light-transmitting second carrier plate assembly 400, the second carrier plate assembly 400 may include the light-transmitting two panels and an elastic second adhesive film 420. The second panel 410, the second adhesive film 420 and the battery assembly 200 are stacked in sequence. The second panel 410 has a light-shielding sheet 600 on one side surface near the second adhesive film 420 to form the second light-shielding part.

[0045] The second adhesive film 420 has a certain degree of elasticity. Since the conductive sheet 300 is stacked on the edge of the battery cell, adding the second adhesive film 420 between the second panel 410 and the battery cell can improve the adhesion performance. At the same time, no rigid pressure will be generated at the stacking position, which will cause damage to the second panel 410 or the battery cell. Specifically, the second panel 410 can be single-coated or double-coated patterned glass, and can be semi-tempered or fully tempered.

[0046] The light-shielding sheet 600 can be a film with a color close to or the same as the surface color of the solar cell, such as black or dark gray, so that users can see a uniform surface color of the BIPV photovoltaic device.

[0047] In some embodiments of this utility model, such as Figure 4 As shown, the width of the light-shielding sheet 600 along the length of the battery string is greater than or equal to the spacing between two adjacent battery sheets, thereby covering the location of the conductive sheet 300 as much as possible and ensuring uniform color.

[0048] In some embodiments of this utility model, such as Figure 4 As shown, the first panel 110 is provided with a refractive surface 500, or the first panel 110 is provided with a refractive sheet on the side surface opposite to the first adhesive film 120. The refractive surface 500 or the refractive sheet can refract light from the surface of the battery cell to the outside.

[0049] Both the refracting sheet and the refracting surface 500 can be similar to the principle of a semi-refracting and semi-reflecting galvanometer. When light from the conductive sheet 300 enters the refracting surface 500 or the refracting sheet, it is reflected due to the small angle of incidence. However, when light from the battery cell enters the refracting surface 500 or the refracting sheet, it has a larger angle of incidence and can pass through the refracting surface 500 or the refracting sheet to the outside. Specifically, the second panel 410 can also be similarly equipped with a refracting surface 500 and a refracting sheet.

[0050] In some embodiments of this utility model, the width of the refracting surface 500 or the refracting sheet along the length of the battery string is greater than or equal to the spacing between two adjacent battery sheets, thereby ensuring that the location of the conductive sheet 300 can be covered as much as possible.

[0051] In some embodiments of this utility model, the first carrier plate assembly 100 includes the light-transmitting first panel 110 and the elastic first adhesive film 120. The first panel 110, the first adhesive film 120 and the battery assembly 200 are stacked in sequence. The first panel 110 is provided with a refractive surface 500, or the first panel 110 is provided with a refractive sheet on the side surface opposite to the first adhesive film 120. The refractive surface 500 or the refractive sheet can refract light at the surface position of the battery cell to the outside, which is equivalent to providing a refractive surface 500 or a refractive sheet without providing a light-shielding sheet 600.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] 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 BIPV photovoltaic device, characterized in that, include: The first load-bearing plate assembly that allows light to pass through; A battery assembly includes at least one battery string, the battery string including multiple battery cells, the multiple battery cells being connected in series and arranged along the length of the battery string; a curved conductive sheet is disposed between two adjacent battery cells, the first end of the conductive sheet being connected to the front electrode layer of one of the battery cells, and the tail end of the conductive sheet being connected to the back electrode layer of the other battery cell. A second carrier plate group that is transparent or opaque, a first carrier plate group, a battery assembly and a second carrier plate group are stacked in sequence, wherein the first carrier plate group has a first light-shielding part and / or a first refractive part at the position corresponding to the conductive sheet.

2. The BIPV photovoltaic device according to claim 1, characterized in that: The second carrier plate assembly is light-transmitting, and the second carrier plate assembly has a second light-shielding part or a second refractive part at the position corresponding to the conductive sheet.

3. A BIPV photovoltaic device according to claim 1, characterized in that: The front electrode layer and / or the back electrode layer of the battery cell are provided with main grid bars at their edges. The main grid bars are connected to multiple fine grid bars on the corresponding front electrode layer or the back electrode layer. The main grid bars are connected to the conductive sheet.

4. A BIPV photovoltaic device according to claim 1, characterized in that: The conductive sheet is Z-shaped.

5. A BIPV photovoltaic device according to claim 1, characterized in that: The conductive sheet extends along the edges of the battery cell on both sides.

6. A BIPV photovoltaic device according to claim 1, characterized in that: The first carrier plate assembly includes the light-transmitting first panel and the elastic first adhesive film. The first panel, the first adhesive film and the battery assembly are stacked in sequence. The first panel has a light-shielding sheet on the side surface near the first adhesive film to form the first light-shielding part.

7. A BIPV photovoltaic device according to claim 6, characterized in that: The width of the light-shielding sheet along the length of the battery string is greater than or equal to the spacing between two adjacent battery cells.

8. A BIPV photovoltaic device according to claim 6, characterized in that: The first panel has a refractive surface to form a refractive part, or the first panel has a refractive sheet on the side of the first panel facing away from the first adhesive film to form a refractive part. The refractive surface or the refractive sheet can refract light from the surface of the battery cell to the outside.

9. A BIPV photovoltaic device according to claim 8, characterized in that: The width of the refracting surface or the refracting plate along the length of the battery string is greater than or equal to the spacing between two adjacent battery cells.

10. A BIPV photovoltaic device according to claim 1, characterized in that: The first carrier plate assembly includes the light-transmitting first panel and the elastic first adhesive film. The first panel, the first adhesive film and the battery assembly are stacked in sequence. The first panel is provided with a refractive surface, or the first panel is provided with a refractive sheet on the surface of the first panel away from the first adhesive film. The refractive surface or the refractive sheet can refract light from the surface of the battery cell to the outside.

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