Photovoltaic junction box and photovoltaic module

Abstract

The photovoltaic junction box comprises a bottom plate, a side plate and a first bonding piece, the bottom plate and the side plate define a containing cavity used for containing components, the bottom plate and the side plate both comprise light-transmitting materials, and the first bonding piece is arranged at the joint of the bottom plate and the side plate and located on the outer side of the containing cavity. The first bonding piece comprises a light-transmitting material. According to the photovoltaic junction box, the bottom plate and the side plates are made of the light-transmitting materials, and the first bonding pieces used for bonding the bottom plate and the side plates are also made of the light-transmitting materials, so that the light transmittance of the photovoltaic junction box can be greatly improved, light shielding of the photovoltaic junction box is reduced, and the service life of the photovoltaic junction box is prolonged. Sunlight can penetrate through the photovoltaic junction box installed on the surface of the photovoltaic panel and irradiate the photovoltaic panel, and therefore the generating capacity and the generating efficiency of the photovoltaic panel are not affected.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic junction box and a photovoltaic module. Background Art

[0002] Photovoltaic modules refer to power generation elements that convert solar energy into electrical energy. Among them, double-glass photovoltaic modules can generate electricity on both the front and back sides, which can significantly improve power generation efficiency and have certain advantages in use.

[0003] Photovoltaic modules specifically include photovoltaic panels for power generation and photovoltaic junction boxes installed on one side of the photovoltaic panels. The photovoltaic junction boxes are used to achieve series or parallel connection between adjacent photovoltaic panels. Generally, the photovoltaic junction boxes are installed on the side of the photovoltaic panels away from the sunlight to avoid blocking the light that hits the surface of the photovoltaic panels. However, in double-glass photovoltaic modules, since both sides of the photovoltaic panels can receive sunlight and generate electricity, no matter which side of the photovoltaic panel the photovoltaic junction box is installed on, it will block the light that hits the surface of the photovoltaic panel, reducing its power generation and efficiency. Utility Model Content

[0004] Based on this, it is necessary to provide a photovoltaic junction box and photovoltaic module to address the problem that the photovoltaic junction box installed on the surface of the photovoltaic panel will block the light shining on the surface of the photovoltaic panel, reducing its power generation and power generation efficiency.

[0005] According to one aspect of the present application, an embodiment of the present application provides a photovoltaic junction box, comprising: a bottom plate and a side plate, the bottom plate and the side plate are arranged to form a accommodating cavity for accommodating components, and the bottom plate and the side plate both include a light-transmitting material; and a first adhesive component, arranged at the junction of the bottom plate and the side plate and located outside the accommodating cavity, and the first adhesive component includes a light-transmitting material.

[0006] In one embodiment, the first adhesive member includes UV curing glue.

[0007] In one embodiment, the light transmittance of the first adhesive is not less than 92%.

[0008] In one embodiment, the material of the bottom plate includes organic glass; and / or the material of the side plate includes organic glass.

[0009] In one of the embodiments, the light transmittance of the bottom plate is not less than 90%; and / or the light transmittance of the side plate is not less than 90%.

[0010] In one of the embodiments, the photovoltaic junction box further includes a second adhesive member, which is disposed at the junction of the bottom plate and the side plate and is located inside the accommodating cavity.

[0011] In one embodiment, the second adhesive member includes anaerobic adhesive.

[0012] According to another aspect of the present application, an embodiment of the present application further provides a photovoltaic assembly, including: a photovoltaic panel; and at least one photovoltaic junction box as described above, disposed on one side surface of the photovoltaic panel.

[0013] In one embodiment, the photovoltaic panel has a plurality of functional areas and a gap area between two adjacent functional areas; the photovoltaic panel includes a plurality of battery cells, and the battery cells are arranged in the functional areas; the photovoltaic junction box is arranged in the gap area.

[0014] In one of the embodiments, along the direction from the solar cell to the photovoltaic junction box located on one side and adjacent to the solar cell, the minimum distance L between the solar cell and the adjacent photovoltaic junction box is ≤10 mm.

[0015] The above-mentioned photovoltaic junction box, by setting the bottom plate and the side plate to include a light-transmitting material, and the first adhesive used to bond the bottom plate and the side plate is also set to include a light-transmitting material. In this way, the light transmittance of the photovoltaic junction box can be greatly improved, and its light obstruction can be reduced, so that sunlight can pass through the photovoltaic junction box installed on the surface of the photovoltaic panel and irradiate onto the photovoltaic panel, thereby not affecting the power generation and power generation efficiency of the photovoltaic panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a photovoltaic junction box provided in one embodiment of the present application.

[0017] Figure 2 Another overall structural schematic diagram of a photovoltaic junction box provided in one embodiment of the present application.

[0018] Figure 3 A schematic diagram of the overall structure of a photovoltaic module provided in one embodiment of the present application.

[0019] The reference numerals in the specific implementation manner are as follows:

[0020] 10: Photovoltaic modules;

[0021] 100: photovoltaic junction box, 110: bottom plate, 120: side plate, 130: accommodating cavity, 140: first adhesive member, 150: second adhesive member;

[0022] 200: photovoltaic panel, 210: battery cell, 220: functional area, 230: gap area;

[0023] x: first direction, y: second direction. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that if 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. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0030] Figure 1 FIG. 1 shows a schematic diagram of the overall structure of a photovoltaic junction box 100 provided in one embodiment of the present application. Figure 2 Another overall structural schematic diagram of a photovoltaic junction box 100 provided in one embodiment of the present application is shown.

[0031] In order to at least partially solve the problem in the related art that the photovoltaic junction box 100 is installed on the photovoltaic panel 200, which will block the light irradiated to the surface of the photovoltaic panel 200 and reduce its power generation and power generation efficiency, please refer to Figure 1 and Figure 2 The embodiment of the present application provides a photovoltaic junction box 100, which includes a bottom plate 110, a side plate 120 and a first adhesive member 140. The bottom plate 110 and the side plate 120 are arranged to form a receiving cavity 130 for receiving components. The bottom plate 110 and the side plate 120 both include a light-transmitting material. The first adhesive member 140 is arranged at the junction of the bottom plate 110 and the side plate 120 and is located outside the receiving cavity 130. The first adhesive member 140 includes a light-transmitting material.

[0032] Among them, the number of side panels 120 can be several, such as two, three, etc., and several side panels 120 are connected end to end to form a relatively closed frame, the two sides of the frame are open, and the bottom plate 110 covers the opening at the bottom of the frame to isolate the internal environment of the frame from the external environment. The internal environment of the frame, that is, the accommodating cavity 130, can be used to accommodate components such as circuit boards and electronic components. The bottom plate 110 and the side panels 120 can be independent components connected together by a mechanical connection method, and the frame formed by the side panels 120 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the frame can be determined according to the specific shape and size of the circuit board and the electronic components. Without limitation, the shape of the bottom plate 110 can be adapted to the shape of the frame to match the frame. In this way, the photovoltaic junction box 100 is not easily deformed when it is squeezed and collided, so that the photovoltaic junction box 100 has a higher structural strength.

[0033] In order to reduce the blocking of light by the bottom plate 110 and the side plate 120, the bottom plate 110 and the side plate 120 both include a light-transmitting material. After the light is projected onto the surface of the bottom plate 110 and the side plate 120 made of light-transmitting material, part of it is reflected, part of it is transmitted, and the other part is absorbed. The property of this material that allows light to pass through is called light transmittance, which can be expressed by light transmittance, that is, the ratio of the intensity of the light passing through the material to the intensity of the incident light. The light transmittance of materials with good light transmittance can be as high as 90% or more, while the light transmittance of opaque materials is zero. The material of the bottom plate 110 and the side plate 120 can be an inorganic light-transmitting material or an organic light-transmitting material, which is not limited here.

[0034] The photovoltaic junction box 100 of the embodiment of the present application further includes a first adhesive member 140 disposed at the junction of the bottom plate 110 and the side plate 120 and located outside the accommodating cavity 130. Since the first adhesive member 140 has a certain adhesiveness, it is disposed at the junction of the bottom plate 110 and the side plate 120, so that a part of the first adhesive member 140 is in contact with and bonded to the bottom plate 110, and another part of the first adhesive member 140 is in contact with and bonded to the side plate 120. In this way, the first adhesive member 140 can play a role in fixing and connecting the bottom plate 110 and the side plate 120. The first adhesive member 140 is disposed outside the accommodating cavity 130 to facilitate its coating and arrangement. On this basis, in order to further reduce the obstruction of light by the bottom plate 110 and the side plate 120, the first adhesive component 140 includes a light-transmitting material. Similarly, after the light is projected onto the surface of the first adhesive component 140 made of the light-transmitting material, part of it is reflected, part of it is transmitted, and the other part is absorbed. The transmittance of the first adhesive component 140 is a certain value greater than zero, which varies according to the specific materials used. The material of the first adhesive component 140 can be an inorganic light-transmitting material or an organic light-transmitting material, which is not limited here.

[0035] The photovoltaic junction box 100 of the embodiment of the present application is configured such that both the bottom plate 110 and the side plate 120 include a light-transmitting material, and the first adhesive member 140 for bonding the bottom plate 110 and the side plate 120 is also configured to include a light-transmitting material. In this way, the light transmittance of the photovoltaic junction box 100 can be greatly improved, and its light shielding can be reduced, so that sunlight can pass through the photovoltaic junction box 100 installed on the surface of the photovoltaic panel 200 and irradiate the photovoltaic panel 200, thereby not affecting the power generation and power generation efficiency of the photovoltaic panel 200.

[0036] As described above, the material of the first adhesive 140 can be an inorganic light-transmitting material or an organic light-transmitting material. In some embodiments, optionally, the first adhesive 140 includes a UV-curing adhesive. UV-curing adhesive, also known as shadowless adhesive or photosensitive adhesive, is a type of adhesive that must be cured by ultraviolet light. The curing principle is that the photoinitiator (or photosensitizer) in the UV-curing material absorbs ultraviolet light under ultraviolet light to produce active free radicals or cations, which triggers monomer polymerization and cross-linking chemical reactions, so that the adhesive is converted from liquid to solid within a few seconds. The optical properties of UV-curing adhesive are excellent, the colloid is colorless and transparent, the transparency can reach more than 90% after curing, and the product does not turn yellow or white for a long time. Therefore, the use of the first adhesive 140 including UV-curing adhesive can greatly improve the light transmittance of the photovoltaic junction box 100 and reduce its light shielding.

[0037] Based on the above embodiment, optionally, the light transmittance of the first adhesive 140 is not less than 92%. For example, the light transmittance of the first adhesive 140 can be 92%, 93% or even 95%.

[0038] As described above, the material of the bottom plate 110 and the side plate 120 can be an inorganic light-transmitting material or an organic light-transmitting material. In some embodiments, optionally, the material of the bottom plate 110 includes organic glass, or the material of the side plate 120 includes organic glass, or the material of the bottom plate 110 and the side plate 120 both include organic glass. Organic glass (Polymethyl Methacrylate, PMMA) is a chemical name for polymethyl methacrylate, which is a polymer compound polymerized from methyl methacrylate. It has good light transmittance, can transmit more than 92% of sunlight, can transmit more than 73.5% of ultraviolet rays, has high mechanical strength, has certain heat and cold resistance, corrosion resistance, good insulation performance, stable size, and is easy to form. Therefore, the use of the bottom plate 110 and / or the side plate 120 including organic glass can greatly improve the light transmittance of the photovoltaic junction box 100 and reduce its light blocking.

[0039] Based on the above embodiments, optionally, the light transmittance of the bottom plate 110 is not less than 90%, or the light transmittance of the side plate 120 is not less than 90%, or the light transmittance of both the bottom plate 110 and the side plate 120 is not less than 90%. Exemplarily, the light transmittance of the bottom plate 110 and / or the side plate 120 can specifically reach 90%, 92%, 93% or even 95%.

[0040] The first adhesive member 140 is disposed at the joint of the bottom plate 110 and the side plate 120 and is located outside the accommodating cavity 130 to fix the bottom plate 110 and the side plate 120. Figure 1 and Figure 2 In some embodiments, the photovoltaic junction box 100 may further include a second adhesive 150, which is disposed at the junction of the bottom plate 110 and the side plate 120 and located inside the accommodating cavity 130. Similarly, since the second adhesive 150 has a certain adhesiveness, it is disposed at the junction of the bottom plate 110 and the side plate 120, so that a part of the second adhesive 150 is in contact with and bonded to the bottom plate 110, and another part of the second adhesive 150 is in contact with and bonded to the side plate 120. In this way, the second adhesive 150 can play a role in fixing and connecting the bottom plate 110 and the side plate 120. The second adhesive 150 is disposed inside the accommodating cavity 130, and is mutually complementary to the first adhesive 140, thereby enhancing the bonding effect on the bottom plate 110 and the side plate 120. Since the second adhesive 150 is located inside the accommodating cavity 130, compared with the first adhesive 140, the probability and duration of the second adhesive 150 being exposed to light can be ignored. Therefore, the material of the second adhesive 150 does not affect the light transmittance of the photovoltaic junction box 100. The second adhesive 150 may include a light-transmitting material or may not include a light-transmitting material.

[0041] As described above, the second adhesive 150 may include a light-transmitting material or may not include a light-transmitting material. Based on the above embodiment, optionally, the second adhesive 150 includes an anaerobic adhesive. Anaerobic adhesive is also known as anaerobic adhesive, anaerobic adhesive, thread adhesive, and mechanical adhesive. Its main component is (methyl) acrylate, and the commonly used initiator is cumene hydroperoxide or tert-butyl hydroperoxide, and an accelerator (such as saccharin, benzenesulfonyl hydrazide). Stabilizers, inhibitors, and modifiers are also added. It will not solidify when it comes into contact with oxygen or air. Once it is isolated from the air, it can quickly polymerize and solidify at room temperature to form a firm bond and a good seal. It can be stored for many years by utilizing the inhibitory effect of oxygen. Therefore, anaerobic adhesive has the characteristics of relatively small volume shrinkage during solidification, good heat resistance and chemical resistance, good vibration resistance and impact resistance, stable storage, easy automation operation, non-solidification of the overflow part, and easy cleaning.

[0042] Figure 3 A schematic diagram of the overall structure of a photovoltaic assembly 10 provided in one embodiment of the present application is shown.

[0043] Please combine Figure 1 and Figure 2 Also see Figure 3 Based on the same inventive concept, an embodiment of the present application further provides a photovoltaic assembly 10, which includes a photovoltaic panel 200 and at least one photovoltaic junction box 100 as in any of the above embodiments, and the photovoltaic junction box 100 is arranged on one side surface of the photovoltaic panel 200.

[0044] like Figure 3 As shown, a plurality of photovoltaic junction boxes 100 may be provided in the photovoltaic assembly 10, and the photovoltaic junction boxes 100 are used to realize the series connection or parallel connection between adjacent photovoltaic panels 200. In some embodiments, the diode (not shown in the figure) in the photovoltaic junction box 100 is electrically connected to the bus bar (not shown in the figure) on the photovoltaic panel 200 through a conductive sheet to realize the series connection or parallel connection of adjacent photovoltaic panels 200, and the photovoltaic junction box 100 is used to connect the photovoltaic panel 200 to an energy storage device or an electrical device, and the photovoltaic junction box 100 is bonded and fixed to the side of the photovoltaic panel 200 facing the sunlight through an adhesive.

[0045] Due to the use of the photovoltaic junction box 100 in any of the above embodiments, the light transmittance of the photovoltaic junction box 100 in the photovoltaic assembly 10 of the embodiment of the present application is greatly improved, and the blocking of light by the photovoltaic junction box 100 is greatly reduced, so that sunlight can pass through the photovoltaic junction box 100 installed on the surface of the photovoltaic panel 200 and irradiate the photovoltaic panel 200, thereby not affecting the power generation and power generation efficiency of the photovoltaic panel 200. For example, in some specific embodiments, the double-sided light rate of the photovoltaic assembly 10 is increased by 0.95%-1.5%.

[0046] Please continue reading Figure 3 In some embodiments, optionally, the photovoltaic panel 200 has a plurality of functional areas 220 and a gap area 230 located between two adjacent functional areas 220 , the photovoltaic panel 200 includes a plurality of battery cells 210 , the battery cells 210 are disposed in the functional areas 220 , and the photovoltaic junction box 100 is disposed in the gap area 230 .

[0047] The functional area 220 is provided with a battery cell 210 for realizing the power generation function of the photovoltaic panel 200, and in order to set other components such as a photovoltaic junction box 100, a gap area 230 is provided between two adjacent functional areas 220. It should be noted that the functional area 220 and the gap area 230 are virtual areas artificially divided on the photovoltaic panel 200 according to their different functions. There may not be a fixed and clear boundary between the functional area 220 and the gap area 230 to distinguish the two. Their number, arrangement, relative position relationship, shape, size, etc. can be flexibly divided according to different actual use requirements, so no special limitation is made here. One or more photovoltaic junction boxes 100 can be set in the gap area 230. According to the different shapes of the gap area 230, the arrangement of the photovoltaic junction box 100 in the gap area 230 can also be adaptively adjusted. Figure 3 In the illustrated embodiment, the strip-shaped gap area 230 is provided with three photovoltaic junction boxes 100 arranged in a linear manner.

[0048] The cell 210 in the photovoltaic panel 200 can be a PERC cell (Passivated Emitter and RearCell), a TOPCON (Tunnel Oxide Passivated Contact), a HJT (Hereto-junction with Intrinsic Thin-layer) cell, an IBC (Interdigitated Back Contact), a perovskite cell, etc., and can be selected according to actual usage requirements.

[0049] exist Figure 3 In the illustrated photovoltaic assembly 10, the cross-sectional shape of the photovoltaic assembly 10 is rectangular, the direction of the short side of the photovoltaic assembly 10 is the first direction x, and the direction of the long side of the photovoltaic assembly 10 is the second direction y. In some embodiments, optionally, along the direction of the solar cell 210 pointing to the photovoltaic junction box 100 located on one side and adjacent to it, that is, along Figure 3 In the second direction y, the minimum distance L between the cell 210 and the adjacent photovoltaic junction box 100 is ≤ 10 mm. Exemplarily, the minimum distance L between the cell 210 and the adjacent photovoltaic junction box 100 may be 0.5 mm, 1 mm, 3.8 mm, 5.2 mm, 7.4 mm, 8.5 mm, 10 mm, etc. The above data are only examples of the minimum distance L between the cell 210 and the adjacent photovoltaic junction box 100. In other embodiments, the minimum distance L between the cell 210 and the adjacent photovoltaic junction box 100 may not be limited to the above examples.

[0050] To sum up, the light transmittance of the photovoltaic junction box 100 in the photovoltaic assembly 10 of the embodiment of the present application is greatly improved, and the light blocking of the photovoltaic junction box 100 is greatly reduced, so that sunlight can pass through the photovoltaic junction box 100 installed on the surface of the photovoltaic panel 200 and irradiate the photovoltaic panel 200, thereby not affecting the power generation and power generation efficiency of the photovoltaic panel 200.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic junction box, characterized in that: include: A bottom plate and a side plate, wherein the bottom plate and the side plate are arranged to form a receiving cavity for receiving components, and the bottom plate and the side plate both comprise a light-transmitting material; and The first adhesive component is arranged at the joint of the bottom plate and the side plate and is located outside the accommodating cavity, and the first adhesive component comprises a light-transmitting material.

2. The photovoltaic junction box according to claim 1, characterized in that: The first adhesive member includes ultraviolet curing glue.

3. The photovoltaic junction box according to claim 2, characterized in that: The light transmittance of the first adhesive member is not less than 92%.

4. The photovoltaic junction box according to claim 1, characterized in that: The material of the bottom plate includes organic glass; and / or The material of the side panel includes organic glass.

5. The photovoltaic junction box according to claim 4, characterized in that: The light transmittance of the bottom plate is not less than 90%; and / or The light transmittance of the side panel is not less than 90%.

6. The photovoltaic junction box according to claim 1, characterized in that: The photovoltaic junction box further includes a second adhesive member, which is disposed at the junction of the bottom plate and the side plate and is located inside the accommodating cavity.

7. The photovoltaic junction box according to claim 6, characterized in that: The second adhesive member includes anaerobic adhesive.

8. A photovoltaic module, characterized in that: include: Photovoltaic panels; and At least one photovoltaic junction box according to any one of claims 1 to 7 is arranged on a side surface of the photovoltaic panel.

9. The photovoltaic module according to claim 8, characterized in that: The photovoltaic panel has a plurality of functional areas and a gap area between two adjacent functional areas; The photovoltaic panel includes a plurality of battery cells, and the battery cells are arranged in the functional area; The photovoltaic junction box is arranged in the gap area.

10. The photovoltaic module according to claim 9, characterized in that: Along the direction from the solar cell to the photovoltaic junction box located on one side and adjacent to the solar cell, the minimum distance L between the solar cell and the adjacent photovoltaic junction box is ≤10 mm.

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