Tailorable BIPV photovoltaic panel and cutting method thereof

Abstract

The invention discloses a tailorable BIPV photovoltaic panel, which comprises a front panel, an adhesive film, a photovoltaic cell array and a bottom plate, the two sides of the photovoltaic cell array are respectively provided with a bus line, each bus line is provided with at least two connector lugs, the positions, corresponding to the connector lugs, of the bottom plate are provided with junction boxes, and the bus lines are connected in parallel with at least two groups of photovoltaic cell packs connected in series. The tailorable BIPV photovoltaic panel can be tailored along the tailoring lines on the bottom plate according to the required length, only the power generation current of the photovoltaic panel is reduced after tailoring, the voltage and other performance of the photovoltaic panel are not affected, and the tailorable BIPV photovoltaic panel can be mixed with other similar photovoltaic panels for use and is particularly suitable for the fields of building integrated photovoltaic (BIPV) and the like.

Description

Technical Field

[0001] The present invention relates to the field of building integrated photovoltaics (BIPV), and in particular to a cuttable BIPV photovoltaic panel and a cutting method thereof. Background Art

[0003] Currently, photovoltaic panels are all of standard size and cannot be cut. Installing them on buildings is like a person wearing ill-fitting clothes. This makes it impossible for the photovoltaic panels to blend perfectly with the buildings, and they even appear abrupt, affecting the process of photovoltaic building integration. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a cuttable BIPV photovoltaic panel and a cutting method thereof, which can be tailored for different buildings and enable the photovoltaic panel to be perfectly integrated with the building.

[0005] The technical solution of the present invention is to provide a cuttable BIPV photovoltaic module, characterized in that it comprises a front plate, a film, a photovoltaic cell array, a film, and a bottom plate arranged in sequence from top to bottom; wherein: A busbar is provided on each side of the photovoltaic cell array, and at least two wiring heads are provided on each busbar. A wiring box is provided at a position corresponding to the wiring head on the bottom plate; at least two groups of photovoltaic cells connected in series are connected in parallel on the busbar.

[0006] The present invention also provides a method for cutting a BIPV photovoltaic panel, which is characterized by comprising the following steps: S1 uses a cutting machine to cut the BIPV photovoltaic panel along the cutting line on the bottom plate; S2 uses a cutting machine blade to make a groove on the cut surface at the location of the busbar, so that the exposed part of the busbar is ground and immersed in the bottom of the groove; S3 cleans the groove; S4 fills the groove with glue; S5: After the glue solidifies, you can use the cut BIPV photovoltaic modules normally.

[0007] The present invention proposes a cuttable BIPV photovoltaic panel, which can be cut along the cutting line on the bottom plate by a cutting machine or other tools compared with the existing non-cuttable photovoltaic panel. After cutting, the busbar ends at the incision can be sealed with glue, and can be used like conventional photovoltaic panels. After cutting, the BIPV photovoltaic panel has no change in other performances except that the current is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 A schematic diagram of the structure of a cuttable BIPV photovoltaic panel provided in an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the photovoltaic cell array structure provided in Example 1 of the present invention.

[0011] Figure 3 This is a schematic diagram of the photovoltaic cell array structure provided in Embodiment 2 of the present invention.

[0012] Figure 4 This is a schematic diagram of the photovoltaic cell array structure provided in Example 3 of the present invention.

[0013] Figure 5 A schematic diagram of the structure of the photovoltaic panel after cutting and sealing provided by an embodiment of the present invention.

[0014] In the figure, the front plate 1, the adhesive film 2, the photovoltaic cell array 3, the adhesive film 4, the bottom plate 5, the groove 6, the bus bar 301, the terminal head 3011, the photovoltaic cell group 302, the junction box 501, and the cutting line 502. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.

[0017] It should also be noted that the directions such as left, right, up and down in the embodiments of the present invention are only relative concepts or are based on the normal use status of the product, and are not considered to be restrictive.

[0018] like Figure 1As shown, the cuttable BIPV photovoltaic module provided by the embodiment of the present invention is characterized in that it includes a front plate (1), an adhesive film (2), a photovoltaic cell array (3), an adhesive film (4), and a bottom plate (5) arranged in sequence from top to bottom, which is no different from a normal photovoltaic panel and is also a very mature technology; wherein, a bus bar (301) is provided on each of the left and right sides of the photovoltaic cell array (3), and the bus bar is generally made of tinned copper foil, and each bus bar (301) is provided with at least two wiring heads (3011), and the wiring heads (3011) are used to lead out the current on the photovoltaic array (3), and the wiring heads (3011) are provided with a junction box (501) at a position corresponding to the position on the bottom plate (5); and at least two groups of photovoltaic cells (302) connected in series are connected in parallel on the bus bar (301).

[0019] Preferably, in one embodiment of the present invention, Figure 2 , 3 As shown in 4, the number of the connection heads (3011) provided on each busbar (301) is consistent with the number of the photovoltaic battery groups (302). After the connection heads (3011) are provided at both ends of each photovoltaic battery group (302), each photovoltaic battery group (302) can be cut separately. After cutting, each photovoltaic battery group (302) is still complete, with positive and negative busbars and a connection box, and can be used separately.

[0020] Preferably, in one embodiment of the present invention, the position of the terminal head (3011) on the bus bar (301) is at the intersection of the photovoltaic cell group (302) and the bus bar (301). The advantage of arranging the terminal head (3011) at the intersection is that there is no need to worry about the terminal head (3011) being cut off when cutting the photovoltaic panel, resulting in the cut photovoltaic cell group (302) being incomplete and unusable.

[0021] Preferably, in one embodiment of the present invention, the cuttable BIPV photovoltaic panel is characterized in that the number N of photovoltaic cells connected in series in the photovoltaic cell group (201) is 2≤N≤96; the voltage of a single solar cell is generally 0.4 to 0.7V, and the commonly used solar cell modules are 36 / 54 / 60 / 72 / 96 cells connected in series, and the voltage is about 18 / 27 / 30 / 36 / 48V.

[0022] Preferably, in one embodiment of the present invention, the number N of photovoltaic cell groups connected in parallel on the bus bar (301) is 2≤N≤200. The more photovoltaic cell groups are connected in parallel, the total current of 200 groups is 15A, calculated based on a current of 75 mA per group, and a wire of less than 4 square meters can be used.

[0023] Preferably, in one embodiment of the present invention, the cover plate (1) is made of ETFE material; ETFE panels have been used in stadiums and have demonstrated their excellent performance and broad application prospects; after the cover plate is made of ETFE panels, the entire photovoltaic panel can be easily cut using cutting tools such as a grinder; traditional photovoltaic front packaging materials are mostly glass, which has high strength and good light transmittance, but is heavy and cannot be greatly bent; polymer materials are increasingly gaining attention as front plate materials to replace glass, especially in the packaging structure of lightweight and flexible components, enriching the application scenarios of photovoltaic components; in addition to having good light transmittance and UV resistance, the transparent front plate also needs to provide certain mechanical strength, weather resistance such as wind resistance and hail impact resistance, and a thermal expansion coefficient that matches other packaging materials; typical front plate materials include tempered glass, ETFE, fluorocarbon resin, PVF, PVDF, etc., and ETFE panels are preferred here.

[0024] Preferably, in one embodiment of the present invention, the base plate (5) is a metal plate; the materials used for the photovoltaic panel back plate mainly include glass, fluorine layer and modified weather-resistant PET, metal plate, etc. As a building integrated product, the fire protection level of the BIPV photovoltaic panel must meet sufficient requirements, so PET materials cannot be used; and in addition to fire protection, the roof must also consider waterproofing and load-bearing, so glass cannot be used. The preferred base plate here is a metal plate. In addition, the metal plate can be made into various shapes and made into various metal tiles.

[0025] The bottom plate (5) is provided with a cutting line (502), and cutting needs to be performed along the cutting line, so as not to damage the overall structure of the photovoltaic panel, thereby ensuring that the service life and performance of the photovoltaic panel remain unchanged.

[0026] The cover plate (1), the photovoltaic cell array (3), and the bottom plate (5) are pressed together by means of adhesive films (2) and (4), which is a conventional pressing method with a very mature technology.

[0027] like Figure 5 As shown, the present invention also provides a method for cutting a BIPV photovoltaic panel, the method comprising the following steps: S1 uses a cutting machine to cut the BIPV photovoltaic panel along the cutting line (501) on the bottom plate (5); After the BIPV photovoltaic panel is cut open, the busbar (301) will be exposed to the air. At this time, a groove (6) is opened on the cut surface at the location of the busbar (301) using a cutting machine blade, so that the exposed part of the busbar (301) is polished and immersed in the bottom of the groove (6); S3 cleans the groove (6); S4 fills the groove with glue (6); S5: After the glue solidifies, you can use the cut BIPV photovoltaic modules normally.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cuttable BIPV photovoltaic panel, characterized in that: It comprises a front plate (1), a film (2), a photovoltaic cell array (3), a film (4), and a bottom plate (5) which are arranged in sequence from top to bottom; wherein: A busbar (301) is provided on each side of the photovoltaic cell array (3); each busbar (301) is provided with at least two connection heads (3011); a connection box (501) is provided at a position corresponding to the connection head (3011) on the bottom plate (5); and at least two groups of series-connected photovoltaic cell groups (302) are connected in parallel to the busbar (301).

2. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The number of connection terminals (3011) provided on each busbar (301) is consistent with the number of photovoltaic cell groups (302).

3. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The position of the connection head (3011) on the busbar (301) is at the intersection of the photovoltaic cell group (302) and the busbar (301).

4. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The number N of photovoltaic cells connected in series in the photovoltaic battery group (201) is 2≤N≤96.

5. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The number N of photovoltaic battery groups connected in parallel on the busbar (301) is 2≤N≤200.

6. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The front plate (1) is an ETFE plate.

7. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that: The bottom plate (5) is a metal plate.

8. The base plate (5) according to claim 1, characterized in that The bottom plate (5) is provided with a cutting line (502).

9. The cuttable BIPV photovoltaic panel according to claim 1, characterized in that The front plate (1), the photovoltaic cell array (3), and the bottom plate (5) are pressed together by adhesive films (2) and (4).

10. A method for cutting a BIPV photovoltaic panel, characterized in that: The steps include: S1, cutting the BIPV photovoltaic panel along the cutting line (501) on the bottom plate (5) using a cutting machine; S2, using a cutting machine blade to open a groove (6) on the cut surface at the location of the bus bar (301), so that the exposed portion of the bus bar (301) is ground and immersed in the bottom of the groove (6); S3, clean the groove (6); S4, filling the groove with glue (6); S5. After the glue solidifies, you can use the cut BIPV photovoltaic modules normally.

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