Explosion-proof photovoltaic module and photovoltaic system thereof

Abstract

The utility model discloses an explosion-proof photovoltaic module and a photovoltaic system thereof. The explosion-proof photovoltaic module comprises a battery piece group; the leading-out wire is provided with a leading-out end connected with the conductive area on the front surface or the back surface of the battery piece group; the outer protection structure comprises a panel, a back plate and a frame which are enclosed to form an inner accommodating space, the battery piece group and the leading-out end of the leading-out wire are arranged in the inner accommodating space, primary edge sealing is realized between the panel and the back plate, and secondary edge sealing is realized between the frame and the panel as well as between the frame and the back plate; therefore, the overall packaging of the photovoltaic module is realized. According to the utility model, the internal conductive area of the photovoltaic assembly can be isolated from the external environment, so that the protection performance of the photovoltaic assembly body is enhanced, the explosion-proof condition required by electrical equipment used in the explosion dangerous environment can be achieved, and the photovoltaic assembly can be used in the explosion dangerous environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar power generation, in particular to an explosion-proof photovoltaic component and a photovoltaic system thereof. Background Art

[0002] Large electricity users across the country, such as oil refineries and other factories, have a large demand for photovoltaic power generation.

[0003] There are many explosive hazardous environments in the production areas of the above-mentioned chemical industry enterprises. Due to relevant safety standards, conventional photovoltaic modules do not meet the explosion-proof requirements of such areas, which limits the scale of photovoltaic installation to a certain extent. Considering the large number of large chemical companies across the country and the heavy task of carbon neutrality in the future, it is very necessary to develop an explosion-proof process for photovoltaic modules suitable for explosive hazardous environments.

[0004] The current production of photovoltaic modules usually adopts the process of laminating photovoltaic cells, external glass panels, substrates, etc., and then assembling metal frames; photovoltaic modules and lead-out cables are connected by welding the cells to the junction box, and then the junction box is welded to the lead-out wires, and then the junction box is sealed in a plastic shell. Neither the modules nor the junction box have explosion-proof properties. When this type of photovoltaic module is used in an explosive environment, it may cause dangerous sources such as disconnected solder joints and conductor discharge, which may ignite volatile gases in the environment and cause fire and explosion hazards. Utility Model Content

[0005] In view of the above technical problems, the purpose of the utility model is to provide an explosion-proof photovoltaic module and a photovoltaic system thereof, which can isolate the conductive area inside the photovoltaic module from the external environment to enhance the protection performance of the photovoltaic module body, so that it can meet the explosion-proof conditions required for electrical equipment used in explosion-hazardous environments, and can be used in explosion-hazardous environments.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] According to one aspect of the utility model, there is provided an explosion-proof photovoltaic assembly, comprising:

[0008] Battery cell group;

[0009] A lead wire having a lead end connected to a front or back conductive area of ​​the battery cell group;

[0010] The outer protective structure includes a panel, a back plate and a frame that enclose an inner storage space. The lead-out ends of the battery cell group and the lead-out wires are arranged in the inner storage space. A primary edge seal is achieved between the panel and the back plate, and a secondary edge seal is achieved between the frame and the panel and the back plate, thereby realizing the overall packaging of the photovoltaic module.

[0011] In some technical solutions, annular grooves and annular ridges are correspondingly designed on the inner side edge areas of the panel and the back plate, and the annular groove is adapted to receive the annular ridge for primary sealing between the internal conductive area of ​​the photovoltaic module and the external environment.

[0012] In some technical solutions, a first recessed groove is designed on the middle area of ​​the inner side surface of the panel, and a second recessed groove is designed on the back panel in an area corresponding to the first recessed groove. The first recessed groove and the second recessed groove together form a storage space for the outer protective structure.

[0013] In some technical solutions, the edge of the battery cell group is accommodated in the inner sidewalls of the first recessed groove and the second recessed groove.

[0014] In some technical solutions, the contact edge of the frame and the panel forms a first sealing ring by pouring packaging material, and the contact edge of the frame and the back panel forms a second sealing ring by pouring packaging material. The first sealing ring and the second sealing ring are used for secondary sealing between the conductive area inside the photovoltaic module and the external environment.

[0015] In some technical solutions, the front panel and the back panel are both made of organic glass.

[0016] In some technical solutions, the organic glass material is any one of methyl methacrylate, polycarbonate and propylene glycol carbonate.

[0017] In some technical solutions, the junction boxes are evenly distributed in the left, middle and right regions of the outer side of the back plate, and the junction boxes are provided with connection terminals for leading out wires for connection; and

[0018] The first sealing component is enclosed on the outside of the junction box and the connection point of the lead wire.

[0019] According to another aspect of the present invention, an explosion-proof photovoltaic system is further provided, comprising a plurality of groups of explosion-proof photovoltaic components as described above connected in series and / or in parallel.

[0020] In some technical solutions, adjacent photovoltaic modules are connected via plug connectors at the external ends of their respective lead wires, and a second sealing member for insulation and isolation is disposed outside the plug connector, and the second sealing member is a heat shrink tubing or a sealant layer.

[0021] The utility model adopts the above technical solution to have at least the following beneficial effects:

[0022] 1. The explosion-proof photovoltaic module and photovoltaic system proposed by the utility model have an external protective structure that realizes multi-level sealing isolation of the middle battery sheet and two layers of EVA, which significantly reduces the possibility of contact between the internal circuit of the photovoltaic module and the external environment, and realizes the improvement of explosion-proof performance;

[0023] 2. The explosion-proof photovoltaic module and photovoltaic system proposed by the utility model can be applied to explosion-hazardous areas, greatly broadening the application scenarios of photovoltaic power generation without being restricted by environmental factors; at the same time, it can also improve the utilization rate of the factory site, increase the installed capacity of photovoltaic power generation and the amount of new energy power generation;

[0024] 3. The explosion-proof photovoltaic module and photovoltaic system proposed by the utility model optimize the planar structure of the panel and back plate of the conventional photovoltaic module, improve it into a concave-convex structure, improve the contact tightness between the panel and the back plate and the sealing performance of the external protective structure, further isolate the internal circuit from the external environment, and improve the explosion-proof performance;

[0025] 4. The explosion-proof photovoltaic module and photovoltaic system proposed by the utility model replace the glass panel and composite material backboard of the conventional photovoltaic module with transparent organic glass material, so that the panel and the backboard are made of the same material, thereby improving the fit and connection strength of the panel and the backboard during lamination;

[0026] 5. The explosion-proof photovoltaic assembly and photovoltaic system proposed in the utility model adopt external protection measures to improve the sealing of the junction box, wire contacts and wire plug connectors, thereby achieving isolation function while improving insulation performance, so that it can be used in places with explosion-proof requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings and their marks 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.

[0028] Figure 1 It is a schematic diagram of a primary edge seal of the outer protective structure according to an embodiment of the utility model;

[0029] Figure 2 A side view of the secondary edge seal of the outer protective structure according to an embodiment of the utility model;

[0030] Figure 3 A top view of the secondary edge seal of the outer protective structure according to an embodiment of the utility model;

[0031] Figure 4 It is a schematic structural diagram of a photovoltaic system described in an embodiment of the utility model.

[0032] The meanings of the symbols in the figure are as follows:

[0033] 10—photovoltaic module board, 11—panel, 111—annular groove, 12—front EVA layer, 13—battery cell, 14—rear EVA layer, 15—back plate, 151—annular ridge, 20—frame, 31—first sealing ring, 32—second sealing ring, 40—junction box, 41—first sealing member, 50—lead wire, 60—plug connector, 70—heat shrink tubing. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0035] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0036] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0037] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] Example 1

[0039] The existing photovoltaic module manufacturing process uses a lamination and fixing method of five layers of materials, including a front panel, front EVA, battery cells, rear EVA, and rear panel. The front panel (made of glass) and the rear panel (generally a composite material) constitute the outer shell of the photovoltaic module. The circuit part inside the photovoltaic module of this process is not perfectly isolated from the external environment. When used in an explosive environment, it is easy to ignite volatile gases in the environment, causing fire and explosion hazards.

[0040] In order to solve the dangerous factors of the existing photovoltaic modules and the condition limitation that they cannot be used in explosive hazardous environments, the present embodiment provides an explosion-proof photovoltaic module, including: a battery cell group, a lead wire 50 and an outer protective structure, the battery cell group is a combination of several solar cells connected in series or in parallel to form a larger current or voltage output; the lead wire 50 has a lead end connected to the front or back conductive area of ​​the battery cell group; the outer protective structure includes a panel 11, a back plate 15 and a frame 20 that enclose an inner storage space, the battery cell group and the lead end of the lead wire 50 are arranged in the inner storage space, a primary edge seal is achieved between the panel 11 and the back plate 15, and a secondary edge seal is achieved between the frame 20 and the panel 11 and the back plate 15, thereby realizing the overall packaging of the photovoltaic module.

[0041] In this embodiment, the outer protective structure achieves multi-level sealed isolation for the middle battery cell group, significantly reducing the possibility of contact between the internal circuit of the photovoltaic module and the external environment, thereby improving the explosion-proof performance; and can be applied to explosion-hazardous areas, greatly broadening the application scenarios of photovoltaic power generation, and no longer being restricted by environmental factors; at the same time, it can also improve the utilization rate of the site within the factory, increase the installed capacity of photovoltaic power generation and the amount of new energy power generation.

[0042] In a preferred embodiment, reference Figure 1 An annular groove 111 is designed on the edge area of ​​the inner side surface of the panel 11, and an annular ridge 151 is designed on the inner side surface of the back plate 15 corresponding to the annular groove area, and the annular groove 111 can be adapted to receive the annular ridge 151 for a primary sealing between the conductive area inside the photovoltaic module and the external environment; of course, this embodiment can also be deformed and replaced in the following ways, for example, an annular groove 111 is designed on the edge area of ​​the inner side surface of the back plate 15, and an annular ridge 151 is designed on the inner side surface of the panel 11 corresponding to the annular groove area, and the annular groove 111 can be adapted to receive the annular ridge 151 for a primary sealing between the conductive area inside the photovoltaic module and the external environment; or, the annular groove 111 and the annular ridge 151 are multiple groups arranged concentrically; or, it can be replaced with a mortise and tenon connection structure, a groove is opened on one of the inner sides of the panel 11 and the back plate 15, and a pillar is designed on the other inner side surface, the pillar is pressed into the groove, and then a wedge-shaped piece is inserted into the gap between the groove and the pillar to fill and clamp it to achieve a primary edge sealing.

[0043] Specifically, a first concave groove is designed on the middle area of ​​the inner side of the panel 11, and a second concave groove is designed on the area of ​​the back plate 15 corresponding to the first concave groove. The first concave groove and the second concave groove enclose the inner space of the outer protective structure. Preferably, the battery cell group includes the middle battery cell 13, the front EVA layer 12 and the rear EVA layer 14, which are indented inward as a whole so that the edges fit the inner side walls of the first concave groove and the second concave groove.

[0044] In this embodiment, the planar structure of the panel 11 and the back panel 15 of the conventional photovoltaic module is optimized and improved to a concave-convex structure, thereby improving the contact tightness between the panel 11 and the back panel 15 and the sealing performance of the external protective structure, further isolating the internal circuit from the external environment, and improving the explosion-proof performance.

[0045] In a specific embodiment, Figure 2-3 The contact edge of the frame 20 and the panel 11 forms a first sealing ring 31 by pouring the packaging material, and the first sealing ring 31 is formed at the four boundaries where the frame 20 contacts the panel 11; the contact edge of the frame 20 and the back plate 15 forms a second sealing ring 32 by pouring the packaging material, and the second sealing ring 32 is formed at the four boundaries where the frame 20 contacts the back plate 15; the first sealing ring 31 and the second sealing ring 32 are used for secondary sealing between the conductive area inside the photovoltaic module and the external environment.

[0046] The packaging material is preferably an epoxy resin material, such as polymethyl methacrylate (PMMA), polycarbonate (PC), or propylene glycol carbonate.

[0047] Example 2

[0048] This embodiment is based on the embodiment 1, and the following improvements are made:

[0049] The front panel 11 and the back panel 15 are both changed to organic glass materials, such as methyl methacrylate, polycarbonate, propylene glycol carbonate, and modified and substituted products based on the above materials.

[0050] In this embodiment, the organic glass used has certain flexibility and buffering properties. Compared with the brittleness of tempered glass, the shell has a stronger ability to resist impact and breakage. After replacing with organic glass, the upper and lower panels 11 can be made of organic polymer materials, with better lamination and bonding performance, and are the same organic composite material as EVA, with stronger connection tightness. Before the organic glass is formed, it has better plasticity and lower processing difficulty, and is easier to manufacture into the designed complex shape.

[0051] Example 3

[0052] Based on Embodiment 1 and Embodiment 2, this embodiment further provides an explosion-proof photovoltaic system, such as Figure 4 , including multiple groups of explosion-proof photovoltaic modules connected in series and / or in parallel, considering the sealing isolation of wire contacts and wire plug connectors, the improvement scheme is designed as follows:

[0053] First, junction boxes 40 are evenly distributed on the left, middle and right areas of the back side of the photovoltaic module, and connection terminals for connecting the lead-out wires 50 are arranged inside the junction boxes 40; a first sealing component 41 is encapsulated on the outer side of the connection point between the junction box 40 and the lead-out wires 50, and can be specifically isolated and sealed by pouring epoxy resin material; the metal contacts can be isolated from the external environment to avoid possible ignition of the contacts and ignition of flammable gases in the environment.

[0054] Secondly, adjacent photovoltaic modules are connected via the plug connectors 60 at the external ends of their respective lead-out wires 50, and a second sealing component for insulation isolation is arranged outside the plug connector 60. The second sealing component is a heat shrinkable tube 70 or a sealant layer, which can be obtained by pouring epoxy resin material.

[0055] This embodiment adopts external protection measures to improve the sealing performance of the junction box 40 and the wire contacts and wire plug connectors, thereby improving the insulation performance and achieving the isolation function, so that it can be used in places with explosion-proof requirements.

[0056] The combination of the above embodiments can isolate the contacts on the photovoltaic module panel from the external environment to enhance the protective performance of the photovoltaic module body, and improve the mechanical strength of the wire connection joints between photovoltaic modules. At the same time, the wire connection joints are separated from the environment, so that they can meet the explosion-proof conditions required for electrical equipment used in explosive hazardous environments, so that they can be used in explosive hazardous environments.

[0057] Example 4

[0058] This embodiment further describes the processing technology of the photovoltaic modules involved in the above embodiments 1 and 2 and the photovoltaic system involved in embodiment 3, as follows:

[0059] 1) The original panel 11 is replaced from tempered glass to transparent organic glass; at the same time, the composite material of the back panel 15 is also replaced with the above transparent organic glass material, so that the panel 11 maintains light transmission performance while the same material of the panel 11 and the back panel 15 has better fit during lamination, reduces gaps and improves connection strength;

[0060] 2) The middle of the transparent organic glass panel 11 is designed to be a concave groove, and the photovoltaic cell sheet and the front and rear EVA are retracted inward as a whole, so that they just fit the concave area of ​​the panel; at the same time, a circle of annular groove 111 is designed outside the concave groove of the transparent organic glass panel, and the corresponding position of the component back plate 15 is designed to be an annular convex ridge 151, so that the annular convex ridge 151 just fits the annular groove 111 of the panel 11;

[0061] 3) After the above design, glue is evenly applied on the contact surface between the panel 11 and the back plate 15 of the photovoltaic module, and then laminated to form a photovoltaic module panel 10. In addition, after the photovoltaic module panel 10 and the frame 20 are assembled, epoxy resin material is evenly poured on the four contacting boundaries and two sides to seal again;

[0062] 4) Install a set of rectangular parallelepiped molds outside the junction box 40, and use epoxy resin materials that meet the application environment to cast and seal it, so that it completely and evenly covers the junction box 40 and the wire connection points, and maintains a safe thickness to isolate the metal contacts from the external environment, and avoid possible contact ignition to ignite flammable gases in the environment;

[0063] 5) A section of heat shrink tubing 70 of suitable size is put into the outside of the MC4 plug connector connected to the lead wire 50 between the photovoltaic modules in advance, and its length is 20 mm beyond the outside of the connector at both ends. After the MC4 plug connector is connected, the heat shrink tubing 70 is baked at a suitable temperature to shrink and fit tightly to the outside of the MC4 plug connector, thereby increasing the insulating isolation layer and improving the mechanical tensile strength of the joint to avoid electric sparks caused by disconnection of the joint or discharge caused by loose contact of the conductor, which may ignite flammable gases in the environment.

[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

[0065] Those skilled in the art should understand that although the present invention is described in the form of multiple embodiments, not every embodiment contains only one independent technical solution. Such description in the specification is only for the sake of clarity. Those skilled in the art should understand the specification as a whole and regard the technical solutions involved in each embodiment as being able to be combined into different embodiments to understand the scope of protection of the present invention.

Claims

1. Explosion-proof photovoltaic module, characterized in that: include: Battery cell group; A lead wire having a lead end connected to a front or back conductive area of ​​the battery cell group; The outer protective structure includes a panel, a back plate and a frame that enclose an inner storage space. The lead-out ends of the battery cell group and the lead-out wires are arranged in the inner storage space. A primary edge seal is achieved between the panel and the back plate, and a secondary edge seal is achieved between the frame and the panel and the back plate, thereby realizing the overall packaging of the photovoltaic module.

2. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: Annular grooves and annular ridges are correspondingly designed on the inner side edge areas of the panel and the back plate, and the annular groove is adapted to receive the annular ridge for primary sealing between the internal conductive area of ​​the photovoltaic module and the external environment.

3. The explosion-proof photovoltaic assembly according to claim 2, characterized in that: A first recessed groove is designed on the middle area of ​​the inner side surface of the panel, and a second recessed groove is designed on the back plate in an area corresponding to the first recessed groove. The first recessed groove and the second recessed groove together form a storage space for the outer protective structure.

4. The explosion-proof photovoltaic assembly according to claim 3, characterized in that: The edge of the battery cell group is adhered to the inner sidewalls of the first concave groove and the second concave groove for accommodation.

5. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The contact edge of the frame and the panel forms a first sealing ring by pouring packaging material, and the contact edge of the frame and the back plate forms a second sealing ring by pouring packaging material. The first sealing ring and the second sealing ring are used for secondary sealing between the conductive area inside the photovoltaic module and the external environment.

6. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The front panel and the back panel are both made of organic glass.

7. The explosion-proof photovoltaic assembly according to claim 6, characterized in that: The organic glass material is any one of methyl methacrylate, polycarbonate and propylene diglycol carbonate.

8. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: Also includes: The junction boxes are evenly distributed in the left, middle and right regions of the outer side of the back plate, and the junction boxes are provided with connection terminals for leading out wires; and The first sealing component is enclosed on the outside of the junction box and the connection point of the lead wire.

9. Explosion-proof photovoltaic system, characterized in that, The invention comprises a plurality of explosion-proof photovoltaic components as claimed in any one of claims 1 to 8 which are connected in series and / or in parallel.

10. The explosion-proof photovoltaic system according to claim 9, characterized in that: Adjacent photovoltaic modules are connected via plug connectors at the external ends of their respective lead wires, and a second sealing member for insulation and isolation is arranged outside the plug connector, and the second sealing member is a heat shrink tubing or a sealing adhesive layer.

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