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 front surface or the back surface of the battery piece group; the first protection structure is integrally encapsulated on the outer sides of the battery piece group and the leading-out ends of the leading-out wires, and is integrally formed by pouring a light-transmitting resin material; the photovoltaic system comprises a plurality of groups of photovoltaic modules which are connected in series and / or in parallel, a second protection structure is arranged at a connecting plug part connected by a lead wire led out between adjacent photovoltaic modules, and the whole body is encapsulated at the outer side of the connecting plug and is formed by pouring a resin material. According to the utility model, the electrified part of the photovoltaic assembly is isolated from the external environment, the integrity and the protection performance of the photovoltaic assembly are improved, the overall surface insulation of the photovoltaic assembly is realized, and the discharge possibility between metal parts is reduced, so that the explosion-proof condition required by electrical equipment used in the explosion dangerous environment is achieved, and the photovoltaic assembly is used in the explosion dangerous environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic 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, by isolating the live parts of the photovoltaic module from the external environment and improving the integrity and protection performance of the photovoltaic module, while achieving surface insulation of the entire photovoltaic module and reducing the possibility of discharge between metal parts, so as to achieve the explosion-proof conditions required for electrical equipment used in explosion-hazardous environments, so as to 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 present application, there is provided an explosion-proof photovoltaic assembly, comprising:

[0008] Battery cell group;

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

[0010] The first protective structure is entirely encapsulated on the outside of the battery cell group and the lead-out ends of the lead-out wires and is integrally cast and formed by a light-transmitting resin material.

[0011] Some technical solutions also include junction boxes evenly distributed in the left, middle and right areas of the back side of the battery cell group, wherein terminal assemblies for connecting the lead-out ends of the lead-out wires are arranged in the junction boxes, and the junction boxes are cast on the inner side of the first protective structure.

[0012] In some technical solutions, the terminal assembly includes a crimping terminal and a clamping device, the crimping terminal is used to clamp the lead-out end of the lead-out wire; the clamping device is used to maintain the clamping state of the crimping terminal in real time.

[0013] In some technical schemes, the clamping device is cast on the inner side of the first protective structure, and includes an upper clamping plate, a lower clamping plate and a clamping bolt. A terminal groove for placing a crimping terminal is provided between the upper clamping plate and the lower clamping plate. Bolt holes are matched between the upper clamping plate and the lower clamping plate for installing the clamping bolt. By tightening the clamping bolt, the upper clamping plate and the lower clamping plate clamp the lead-out wire and the crimping terminal.

[0014] In some technical solutions, one or more bypass diodes for circuit protection are provided in the junction box.

[0015] In some technical solutions, the light-transmitting resin material is polymethyl methacrylate or polycarbonate or propylene glycol carbonate.

[0016] According to another aspect of the present application, 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.

[0017] In some technical solutions, adjacent explosion-proof photovoltaic modules are connected via plug connectors at the external ends of their respective lead wires.

[0018] Some technical solutions also include:

[0019] The second protective structure is entirely encapsulated on the outside of the plug connector and is cast by resin material.

[0020] In some technical solutions, the resin material is selected from any one of epoxy resin, polymethyl methacrylate, polycarbonate and propylene glycol carbonate.

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

[0022] 1. The explosion-proof photovoltaic module provided by the utility model isolates the charged parts inside the module from the external environment, and the external physical structure forms a unified whole, and the surface of the photovoltaic module is insulated, thereby avoiding the generation of dangerous sources in an explosion-hazardous environment, so that it can be used in an explosion-hazardous environment;

[0023] 2. The explosion-proof photovoltaic module provided by the utility model adopts a light-transmitting resin material to replace the glass material of the conventional photovoltaic module panel, thereby avoiding the unfavorable factor that the external protection performance is reduced due to the glass being damaged by impact;

[0024] 3. The explosion-proof photovoltaic module provided by the utility model keeps the crimping terminal in a compressed state in real time through a clamping device at the lead-out end of the lead-out wire, so as to prevent the lead-out wire and the crimping terminal from loosening and affecting the sealing performance of the external light-transmitting resin material and the explosion-proof performance of the photovoltaic module;

[0025] 4. In the explosion-proof photovoltaic system provided by the utility model, the connection points of the lead wires between adjacent photovoltaic modules (i.e., the plug connector installation site) are cast and sealed on the inner side of the second protective structure (resin material), so that the wire connectors form an insulation and isolation protection layer with the external environment, which can avoid the unfavorable factors such as damage and disconnection of the original wire plug connectors to create explosion-hazardous conditions for the environment, and greatly improve the safety performance of the contact points. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 A schematic diagram of a conventional photovoltaic module lamination process according to an embodiment of the present utility model;

[0028] Figure 2 This is a front view of the photovoltaic module according to an embodiment of the utility model;

[0029] Figure 3 A side view of a photovoltaic module according to an embodiment of the present utility model;

[0030] Figure 4 This is a diagram showing the installation method of the clamping device according to an embodiment of the utility model;

[0031] Figure 5 It is a cross-sectional schematic diagram of the clamping device according to an embodiment of the utility model;

[0032] Figure 6 It is a schematic structural diagram of a photovoltaic system described in an embodiment of the utility model.

[0033] The meanings of the symbols in the figure are as follows:

[0034] 1—front panel, 2—front EVA, 3—battery sheet, 4—rear EVA, 5—rear panel;

[0035] 10—battery cell group, 20—lead wire, 30—first protective structure, 40—junction box, 50—crimping terminal, 60—clamping device, 70—plug connector, 80—second protective structure;

[0036] 61—upper clamping plate, 62—lower clamping plate, 63—clamping bolt, 64—terminal slot. DETAILED DESCRIPTION

[0037] 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.

[0038] 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".

[0039] 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.

[0040] 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.

[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] Example 1

[0043] like Figure 1The existing photovoltaic module manufacturing process adopts a lamination and fixing method of five layers of materials including a front panel 1, a front EVA 2, a battery cell 3, a rear EVA 4, and a rear panel 5. The front panel (made of glass) and the rear panel (generally a composite material) constitute the outer shell of the photovoltaic module. The photovoltaic modules produced by this process do not have an explosion-proof function. When used in an explosive environment, it is easy to ignite volatile gases in the environment, causing a fire and explosion hazard.

[0044] In order to solve the dangerous factors of existing photovoltaic modules and the limitation that they cannot be used in explosive hazardous environments, this embodiment provides an explosion-proof photovoltaic module with an improved structural design, such as Figure 2 , including a battery cell group 10, a lead wire 20 and a first protective structure 30. The battery cell group 10 is a combination of several solar cells connected in series or in parallel to form a larger current or voltage output; the lead end of the lead wire 20 is located on the front or back side of the battery cell group 10; the first protective structure 30 is entirely encapsulated on the outside of the battery cell group 10 and the lead end of the lead wire 20, and is integrally cast and molded by a light-transmitting resin material.

[0045] In this embodiment, the charged parts inside the component are isolated from the external environment, and the external physical structure forms a unified whole, and the surface of the photovoltaic component is insulated, avoiding the generation of hazardous sources in an explosion-hazardous environment, so that it can be used in an explosion-hazardous environment.

[0046] In this embodiment, the integral casting technology is used to replace the conventional laminated shell structure of the photovoltaic module, so that the outer surface of the photovoltaic module is seamless, the integrity and protection performance of the photovoltaic module are improved, and the explosion caused by the contact between the internal dangerous factors of the photovoltaic module and the environmental conditions is avoided.

[0047] In this embodiment, a light-transmitting resin material is used to replace the glass material of a conventional photovoltaic module panel, thereby avoiding the adverse factor of reduced external protection performance due to glass breakage caused by impact.

[0048] Specifically, refer to Figure 3 The photovoltaic module also includes junction boxes 40 evenly distributed in the left, middle and right regions on the back side of the battery cell group 10. Terminal components for connecting the lead-out ends of the lead-out wires 20 are arranged in the junction box 40. The junction box 40 is cast on the inner side of the first protective structure 30. Preferably, one or more bypass diodes for circuit protection can also be arranged in the junction box 40.

[0049] Specifically, the light-transmitting resin material is polymethyl methacrylate or polycarbonate or propylene glycol carbonate.

[0050] Example 2

[0051] Based on the first embodiment, this embodiment further provides a structure of a terminal assembly.

[0052] like Figure 4 The terminal assembly includes a crimping terminal 50 and a clamping device 60. The crimping terminal 50 is used to clamp the lead-out end of the lead-out wire 20; the clamping device 60 is used to maintain the clamping state of the crimping terminal 50 in real time.

[0053] Specifically, combined with reference Figure 5 The clamping device 60 is cast on the inner side of the first protective structure 30, and includes an upper clamping piece 61, a lower clamping piece 62 and a clamping bolt 63. A terminal groove 64 for placing the crimping terminal 50 is provided between the upper clamping piece 61 and the lower clamping piece 62. Bolt holes are matched between the upper clamping piece 61 and the lower clamping piece 62 for installing the clamping bolt 63. By tightening the clamping bolt 63, the upper clamping piece 61 and the lower clamping piece 62 clamp the lead wire 20 and the crimping terminal 50.

[0054] It should be noted that, during the implementation of the specific solution, other types of terminal components may be selected, such as wiring terminals, which only need to ensure a stable connection of the lead wire 20.

[0055] In this embodiment, the crimping terminal 50 is kept in a compressed state in real time by a clamping device 60 at the lead-out end of the lead-out wire 20, so as to prevent the lead-out wire 20 and the crimping terminal 50 from loosening and affecting the sealing performance of the external light-transmitting resin material and the explosion-proof performance of the photovoltaic module.

[0056] Example 3

[0057] Based on Embodiment 1 and Embodiment 2, this embodiment further provides an explosion-proof photovoltaic system, such as Figure 6 , including a plurality of photovoltaic modules connected in series and in parallel, and adjacent photovoltaic modules are connected via plug connectors 70 at the external ends of their respective lead wires 20 .

[0058] In a preferred embodiment, the photovoltaic system includes a second protective structure 80 which is entirely encapsulated on the outside of the plug connector 70 and is molded by casting a resin material.

[0059] Specifically, the resin material is selected from any one of epoxy resin, polymethyl methacrylate, polycarbonate and propylene glycol carbonate.

[0060] This embodiment forms an insulation and isolation protection layer between the wire connector and the external environment, which can avoid the explosion hazard caused by the damage, disconnection and other adverse factors of the original wire connector, thereby greatly improving the safety performance of the contact point.

[0061] Example 4

[0062] 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:

[0063] In the production process of photovoltaic modules, the solar cells, bypass diodes with crimping terminals 50 and junction boxes 40, lead wires 20, etc. are welded on a plane and then fixed in a rectangular mold at a certain position. Then a certain amount of light-transmitting resin material with a light transmittance of not less than 80%, such as polymethyl methacrylate (PMMA), polycarbonate (PC), propylene glycol carbonate, etc., is injected into the mold. After the light-transmitting resin material is cured and formed, the new process is completed.

[0064] A set of clamping devices 60 is installed at the lead-out end (inside the junction box) of the lead-out wire 20 to keep the end of the wire and the crimping terminal 50 in a real-time pressed state to prevent the lead-out wire 20 and the crimping terminal 50 from loosening and affecting the sealing performance of the external sealing resin material and the explosion-proof performance of the photovoltaic module; the clamping device 60 is also simultaneously cast and sealed inside the resin;

[0065] After the MC4 plug connectors of the external ends of the lead wires 20 between the photovoltaic modules are connected, the plug connector 70 is placed in a rectangular mold, and a resin material is injected into the mold for sealing. After the resin material is cured, the wire connection is protected. The resin material can be epoxy resin, polymethyl methacrylate (PMMA), polycarbonate (PC), propylene glycol carbonate, etc.

[0066] This embodiment can isolate the contacts and live parts on the photovoltaic module panel from the external environment and improve the integrity and protection performance of the photovoltaic module. At the same time, it can achieve surface insulation of the entire photovoltaic module and reduce the possibility of discharge between metal parts, thereby avoiding conditions that may cause explosion hazards and achieving explosion-proof performance of the photovoltaic module, so that it can operate safely and reliably in explosion-hazardous environments.

[0067] 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.

[0068] 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 the front or back side of the battery cell group; The first protective structure is entirely encapsulated on the outside of the battery cell group and the lead-out ends of the lead-out wires and is integrally cast and formed by a light-transmitting resin material.

2. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: It also includes junction boxes evenly distributed in the left, middle and right areas of the back side of the battery cell group, wherein terminal assemblies for connecting the lead-out ends of the lead-out wires are arranged in the junction boxes, and the junction boxes are cast inside the first protective structure.

3. The explosion-proof photovoltaic assembly according to claim 2, characterized in that: The terminal assembly comprises a crimping terminal and a clamping device, wherein the crimping terminal is used to clamp the lead-out end of the lead-out wire; and the clamping device is used to maintain the clamping state of the crimping terminal in real time.

4. The explosion-proof photovoltaic assembly according to claim 3, characterized in that: The clamping device is cast on the inner side of the first protective structure, and includes an upper clamping plate, a lower clamping plate and a clamping bolt. A terminal groove for placing a crimping terminal is provided between the upper clamping plate and the lower clamping plate. A bolt hole is matched between the upper clamping plate and the lower clamping plate for installing the clamping bolt. By tightening the clamping bolt, the upper clamping plate and the lower clamping plate clamp the lead-out wire and the crimping terminal.

5. The explosion-proof photovoltaic assembly according to claim 2, characterized in that: One or more bypass diodes for circuit protection are arranged in the junction box.

6. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The light-transmitting resin material is polymethyl methacrylate or polycarbonate or propylene glycol carbonate.

7. Explosion-proof photovoltaic system, characterized in that, The invention comprises a plurality of explosion-proof photovoltaic assemblies as claimed in any one of claims 1 to 6 which are connected in series and / or in parallel.

8. The explosion-proof photovoltaic system according to claim 7, characterized in that: Adjacent explosion-proof photovoltaic modules are connected via plug connectors at the external ends of their respective lead wires.

9. The explosion-proof photovoltaic system according to claim 8, characterized in that: Also includes: The second protective structure is entirely encapsulated on the outside of the plug connector and is cast by resin material.

10. The explosion-proof photovoltaic system according to claim 9, characterized in that: The resin material is selected from any one of epoxy resin, polymethyl methacrylate, polycarbonate and propylene glycol carbonate.

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