Photovoltaic module based on embedded installation of junction box

Abstract

The utility model relates to a photovoltaic assembly based on embedded installation of junction boxes, which is characterized in that junction boxes arranged along the width direction of back plate glass are arranged on the plane of one side of the back plate glass facing air at intervals, three installation holes are arranged on the back plate glass at intervals, the installation holes comprise circular through holes and rectangular counter bores, and the circular through holes are communicated with the rectangular counter bores. The rectangular counter bore is located on one side of the air surface of the backboard glass, the circular through hole is located on one side of the packaging surface of the backboard glass, sealing silica gel is sprayed on the periphery of the bottom of the junction box after the bottom of the junction box is clamped into the rectangular counter bore, and a bus bar connected with the battery module is connected with the junction box welding part through the circular through hole. According to the utility model, the junction box is embedded in the rectangular counter bore and the junction box is bonded on the back plate glass by using the sealing silica gel, so that the sealing silica gel can be effectively prevented from overflowing to the surface of the back plate glass and water vapor can be effectively prevented from entering the bonding part of the junction box, and the use reliability of the photovoltaic module in a humid and hot environment is improved; and the backboard glass is not easy to explode in a static mechanical load experiment.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a photovoltaic module based on embedded installation of a junction box. Background Technique

[0002] A photovoltaic module is assembled by encapsulating solar cells with a front panel glass, an upper encapsulation film, a lower encapsulation film, a back panel glass, silica gel and a frame material, and leading out current with a bus bar and a junction box.

[0003] In the prior art, the structure of a conventional double-glass module is to install the junction box on the air surface of the back panel glass, and the bottom of the junction box is flush with the air surface of the back panel glass. Usually, a circular hole is opened on the air surface of the back panel glass to lead out the bus bar, and then a special sealing silica gel is sprayed in a circle along the outer periphery of the junction box to bond the junction box to the back panel glass. Finally, the bus bar is welded to the welding part of the junction box to lead out the current.

[0004] However, when bonding the junction box in this way, the liquid sealing silica gel will be extruded and flow to the bonding junction of the junction box and the back panel glass, affecting the appearance beauty of the module, and it is also easy to cause water vapor to invade from the peripheral edge of the side seam, resulting in the failure of the module. In addition, when the photovoltaic module is subjected to a static mechanical load, due to the stress concentration problem at the position of the circular hole on the back panel glass, the back panel glass is prone to burst at the position of the circular hole. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides a photovoltaic module based on embedded installation of a junction box.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a photovoltaic module based on embedded installation of a junction box, including a frame, in which a front panel glass, a first encapsulation film, a battery module, a second encapsulation film and a back panel glass are sequentially arranged from top to bottom. Junction boxes arranged in a row along the width direction of the back panel glass are spaced on the plane of the back panel glass facing the air side. Three mounting holes are spaced on the back panel glass. The mounting holes include a circular through hole and a rectangular counterbore. The rectangular counterbore is located on the air surface side of the back panel glass, and the circular through hole is located on the encapsulation surface side of the back panel glass. After the bottom of the junction box is clamped into the rectangular counterbore, sealing silica gel is sprayed around the bottom of the junction box, and the bus bar connecting the battery module is connected to the welding part of the junction box through the circular through hole.

[0007] Furthermore, the depth of the circular through hole is 1 / 2 to 3 / 4 of the thickness of the back panel glass, and the depth of the rectangular counterbore is 1 / 4 to 1 / 2 of the thickness of the back panel glass.

[0008] Preferably, the diameter of the circular through-hole is 11-12 mm, and the external dimensions of the rectangular counterbore match the bottom dimensions of the junction box.

[0009] Preferably, the external dimensions of the rectangular counterbore are not more than 3 mm larger than the bottom dimensions of the junction box.

[0010] The beneficial effects of the present utility model are as follows: by setting the mounting holes on the backplane glass as rectangular counterbores, the junction box can be embedded in the rectangular counterbores and bonded to the backplane glass with sealing silicone, effectively preventing the sealing silicone from overflowing onto the surface of the backplane glass and water vapor from entering the bonding part of the junction box, improving the reliability of the photovoltaic module in a humid and hot environment, and ensuring that the backplane glass is not prone to bursting during the static mechanical load test. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0012] Figure 1 is a schematic structural view of the present utility model.

[0013] Figure 2 is a schematic structural view of the backplane glass of the present utility model.

[0014] In the figure: 1. Frame, 2. Front plate glass, 3. First encapsulation film, 4. Battery module, 5. Second encapsulation film, 6. Backplane glass, 7. Junction box, 8-1. Circular through-hole, 8-2. Rectangular counterbore. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present utility model will now be described in further detail with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0016] As Figure 1 shown, a photovoltaic module based on the embedded installation of a junction box includes a frame 1. Inside the frame 1, a front plate glass 2, a first encapsulation film 3, a battery module 4, a second encapsulation film 5, and a backplane glass 6 are sequentially arranged from top to bottom. On the plane of the backplane glass 6 facing the air side, three junction boxes 7 are arranged at intervals along the width direction of the backplane glass 6.

[0017] As Figure 2As shown, three mounting holes are spaced apart on the backplane glass 6 corresponding to the position of the junction box 7. The mounting holes include a circular through-hole 8-1 and a rectangular counterbore 8-2. The rectangular counterbore 8-2 is located on the air side of the backplane glass 6, and the circular through-hole 8-1 is located on the encapsulation side of the backplane glass 6. Among them, the depth of the circular through-hole 8-1 is 1 / 2 to 3 / 4 of the thickness of the backplane glass 6, and the depth of the rectangular counterbore 8-2 is 1 / 4 to 1 / 2 of the thickness of the backplane glass 6; the diameter of the circular through-hole 8-1 is 11 to 12 mm, and the outer dimension of the rectangular counterbore 8-2 matches the bottom dimension of the junction box 7, or the outer dimension of the rectangular counterbore 8-2 is slightly larger than the bottom dimension of the junction box 7, but the gap between it and the periphery of the junction box 7 does not exceed 3 mm.

[0018] After the bottom of the junction box 7 is snapped into the rectangular counterbore 8-2, sealing silicone is sprayed around the perimeter of the bottom of the junction box 7. The bus bar connecting the battery module 4 is connected to the welding part of the junction box 7 through the circular through-hole 8-1.

[0019] In the present utility model, a circle of sealing silicone is sprayed around the perimeter of the bottom of the junction box 7 to bond the junction box 7 in the rectangular counterbore 8-2 on the backplane glass 6, and then the bus bar led out from the circular through-hole 8-1 is welded to the welding part of the junction box 7 to lead out the current. After the junction box 7 is installed in this way, the liquid sealing silicone will fill the bottom and perimeter of the rectangular counterbore 8-2 and will not overflow to the surface of the backplane glass 6. Therefore, the bonding junction of the junction box 7 can be kept clean, tidy and beautiful, and water vapor is not likely to invade the bonding junction of the junction box 7, which is beneficial to improving the use reliability of the photovoltaic module in a humid and hot environment. In addition, because the sealing silicone used for bonding has a high molecular elastic effect, it will disperse part of the stress. Therefore, the backplane glass 6 with the mounting holes arranged in this way is not likely to have a phenomenon of panel explosion during the static mechanical load test.

[0020] Inspired by the above ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A photovoltaic module based on the embedded installation of a junction box, comprising a frame (1). Inside the frame (1), a front plate glass (2), a first encapsulation adhesive film (3), a battery module (4), a second encapsulation adhesive film (5) and a back plate glass (6) are sequentially arranged from top to bottom. Junction boxes (7) arranged at intervals are provided on the plane of the back plate glass (6) facing the air side and arranged in the width direction of the back plate glass (6). It is characterized in that: Three mounting holes are spaced on the backplane glass (6). The mounting holes include a circular through-hole (8-1) and a rectangular counterbore (8-2). The rectangular counterbore (8-2) is located on the air side of the backplane glass (6), and the circular through-hole (8-1) is located on the encapsulation side of the backplane glass (6). After the bottom of the junction box (7) is snapped into the rectangular counterbore (8-2), sealing silicone is sprayed around the bottom of the junction box (7). The bus bar connecting the battery module (4) is connected to the welding part of the junction box (7) through the circular through-hole (8-1).

2. The photovoltaic module based on the embedded installation of the junction box according to claim 1, wherein: The depth of the circular through-hole (8-1) is 1 / 2 to 3 / 4 of the thickness of the backplane glass (6), and the depth of the rectangular counterbore (8-2) is 1 / 4 to 1 / 2 of the thickness of the backplane glass (6).

3. The photovoltaic module based on the embedded installation of the junction box according to claim 2, characterized in that: The diameter of the circular through-hole (8-1) is 11 to 12 mm, and the external dimensions of the rectangular counterbore (8-2) match the bottom dimensions of the junction box (7).

4. The photovoltaic module based on the embedded installation of the junction box according to claim 3, characterized in that: The external dimensions of the rectangular counterbore (8-2) are not more than 3 mm larger than the bottom dimensions of the junction box (7).

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