Explosion-proof photovoltaic module

Abstract

The explosion-proof photovoltaic module comprises a main body shell which is of an integrated structure and is provided with a hollow cavity and an end opening communicated with the hollow cavity; the battery unit comprises a battery piece group and a lead-out wire which are electrically connected, the battery piece group is accommodated in the hollow cavity, and the lead-out wire is led out from the front surface or the back surface of the battery piece group through the end opening; the end cover is attached to the end opening and is fixed in a sealed mode. According to the utility model, contacts and electrified parts on the photovoltaic module panel can be isolated from the external environment, and an integral forming mode is adopted, so that the integrity and the protection performance of the photovoltaic module shell are improved, and the direct contact between the condition causing explosion danger and the environment is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power generation, in particular to an explosion-proof photovoltaic component. 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 dangerous factors of conventional photovoltaic modules and the technical problems that they cannot be applied in explosion-hazardous environments due to conditional limitations, the purpose of the utility model is to provide an explosion-proof photovoltaic module that can isolate the contacts and live parts on the photovoltaic module panel from the external environment, and adopt an integrated molding method to improve the integrity and protective performance of the photovoltaic module casing, thereby avoiding direct contact with the environment under conditions that may cause explosion hazards.

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

[0007] An explosion-proof photovoltaic assembly, comprising:

[0008] The main body shell is an integral structure and has a hollow cavity and an end opening communicating with the hollow cavity;

[0009] A battery unit, comprising an electrically connected battery cell group and a lead wire, wherein the battery cell group is accommodated in the hollow cavity, and the lead wire is led out from the front or back side of the battery cell group through the end opening;

[0010] The end cover is fitted to the end opening and sealed and fixed.

[0011] In some technical solutions, the hollow cavity is filled with a protective glue, and the protective glue makes the net volume in the main shell less than 10cm 3 , in order to meet the explosion-proof requirements of the main casing.

[0012] In some technical solutions, the battery unit further includes a sealing layer coated on the outside of the battery cell group; and / or,

[0013] The battery unit further comprises junction boxes evenly distributed in the left, middle and right regions of the back side of the battery cell group, and terminals for connecting the lead wires are arranged in the junction boxes.

[0014] In some technical solutions, the main shell is a plate-shaped rectangular parallelepiped structure, and its end openings and the hollow cavity together form a mounting groove that is adapted to the size of the battery unit.

[0015] In some technical solutions, the material of the main shell is tempered glass that meets the testing requirements of GB15763.2-2005.

[0016] In some technical solutions, the end cover is glued and / or screwed and / or clamped to the open end surface of the main shell.

[0017] In some technical solutions, the end cover is provided with a wire lead-out hole corresponding to the lead-out wire, and the gap between the wire lead-out hole and the lead-out wire is filled with potting glue.

[0018] The utility model adopts the above technical solution to have at least the following beneficial effects:

[0019] 1. The explosion-proof photovoltaic module proposed in the utility model adopts the "integrated molding + end sealing" form for the shell. Compared with the conventional laminated structure, it greatly reduces the splicing gap, improves the integrity of the photovoltaic module shell, and reduces the risk of triggering explosion conditions when in direct contact with the environment;

[0020] 2. The explosion-proof photovoltaic module proposed in the utility model adopts a higher-strength tempered glass as the shell material, which can improve the mechanical strength and impact resistance of the module shell on the one hand; on the other hand, it can improve the light transmittance of the back of the module, thereby increasing the power generation;

[0021] 3. The explosion-proof photovoltaic module proposed in the utility model uses glue filling to fill the internal space of the module during the production process of the photovoltaic module, reducing the net space inside the shell to below the standard value, so as to improve the protection performance of the photovoltaic module and make it meet the flameproof requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of the main body shell according to an embodiment of the utility model;

[0024] Figure 2 A side view of a battery unit according to an embodiment of the present utility model;

[0025] Figure 3 It is a schematic structural diagram of the metal end cover described in an embodiment of the utility model.

[0026] The meanings of the symbols in the figure are as follows:

[0027] 10—main body shell, 11—installation slot, 12—first installation hole;

[0028] 21 - battery cell group, 22 - lead wire, 23 - sealing layer, 24 - junction box;

[0029] 30—metal end cover, 31—wire lead-out hole, 32—second mounting hole. DETAILED DESCRIPTION

[0030] 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.

[0031] 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".

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] The conventional photovoltaic module manufacturing process uses a laminated and fixed 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. Photovoltaic modules produced by this process do not have explosion-proof functions. When used in explosive environments, they can easily ignite volatile gases in the environment, causing the risk of fire and explosion.

[0037] In order to solve the dangerous factors of conventional photovoltaic modules and the condition limitation that they cannot be used in explosive hazardous environments, the present embodiment provides an explosion-proof photovoltaic module with a new structural design, including an integrated main shell 10, a battery unit accommodated in the main shell 10, and a metal end cover 30 that is attached to the end opening of the main shell 10 for sealing and fixing.

[0038] In this embodiment, the main shell 10 of the photovoltaic module adopts the "integrated molding + end sealing" form, which greatly reduces the splicing gap compared to the conventional laminated structure, improves the integrity of the photovoltaic module shell, and reduces the risk of triggering explosion conditions when in direct contact with the environment.

[0039] In the above embodiment, the main housing 10 has a hollow cavity and an end opening connected to the hollow cavity; the battery unit includes an electrically connected battery cell group 21 and a lead wire 22, the battery cell group 21 is accommodated in the hollow cavity, and the lead wire 22 is led out from the front or back side of the battery cell group 21 through the end opening.

[0040] Specifically, refer to Figure 1 The main shell 10 is made of tempered glass and is made into a plate-shaped rectangular structure with a narrow gap at the end. As the main shell 10 of the photovoltaic module, a mounting groove 11 for the battery unit is reserved at one end of the main shell 10, and the other end face and other four sides are all integrated into a molding process, which is well sealed and maintains sufficient thickness to ensure its structural strength.

[0041] In a preferred embodiment, Figure 2 The battery unit also includes a sealing layer 23 wrapped around the outside of the battery cell group 21, and the battery cell group 21 is laminated and fixed by sandwiching the battery cell group 21 between the upper and lower layers of sealant; the common material of the sealing layer 23 is EVA glue, which is used to encapsulate the battery cells, provide protection, prevent moisture and air from entering, and has high transparency to ensure that light can penetrate.

[0042] In another preferred embodiment, Figure 2 The battery unit also includes junction boxes 24 evenly distributed in the left, middle and right regions on the back side of the battery cell group 21. Terminals for connecting the lead wires 22 and diodes for circuit protection are arranged in the junction box 24. Specifically, the connection of the lead wires 22 is further strengthened and sealed, and the internal space of the junction box 24 can also be blocked, thereby improving the protection of the wiring part.

[0043] It should be pointed out that the hollow cavity in the above-mentioned main shell 10 can be directly connected to the end opening or indirectly connected through the connecting cavity, and the end opening and the hollow cavity and the connecting cavity must meet the insertion conditions of the battery cell; in the above various deformations and combinations, preferably, the hollow cavity is directly connected to the end opening, and together constitute a mounting groove 11 adapted to the size of the battery cell; in this embodiment, the insertion channel of the battery cell is designed to match the size of the battery cell, which improves the convenience of battery cell installation; and the mounting groove 11 with a specific configuration design is easier to form and manufacture, and its processing mold is more versatile, and the main shell 10 can be formed by using internal and external molds and injecting molten glass for casting.

[0044] In the above embodiment, Figure 3 The metal end cover 30 is made of high-strength aluminum alloy material. A wire lead-out hole 31 is left on the metal end cover 30 , and its hole position corresponds to the mounting groove 11 on the main shell 10 of the photovoltaic module, which is used for sealing the open end surface of the main shell 10 .

[0045] It should be noted that the metal end cover 30 can be embedded in the end opening of the main shell 10; or, it can be sealed and fixed by fitting with the open end face of the main shell 10; its sealing and fixing method can be one or a combination of gluing, screwing and clamping. Specifically, a combination of screwing and gluing is adopted, and a first mounting hole 12 is reserved on the end face of one side of the formed main shell 10. The multiple first mounting holes 12 are preferably evenly arranged around the end opening, and at the same time, a second mounting hole 32 that is compatible with the hole position and hole diameter of the first mounting hole 12 is opened on the metal end cover 30; first, glue is applied to the open end face of the main shell 10 and the inner side surface of the metal end cover 30, and the hole position is aligned, and bolts made of the same material as the metal end cover 30 are used to tighten, and finally, the gap between the wire lead-out hole 31 and the lead-out wire 22 is filled with potting glue.

[0046] This embodiment effectively isolates the contacts and live parts on the photovoltaic module panel from the external environment, and adopts an integrated molding method to improve the integrity and protection performance of the photovoltaic module housing, avoiding direct contact with the environment under conditions that may cause explosion hazards.

[0047] Example 2

[0048] Based on Example 1, this embodiment further designs the structure of the main housing 10 to meet the explosion-proof requirements. Specifically, a protective glue is filled in the hollow cavity to make the net volume in the main housing 10 less than 10 cm 3 , so as to meet the explosion-proof requirements of the main casing 10.

[0049] In this embodiment, the internal space is filled with glue so that the net space is smaller than the standard value, and the standard value is based on the relevant content of Section 16.2 of GB / T3836.3-2021.

[0050] In the photovoltaic module production process, this implementation method uses glue filling to fill the internal space of the module, reducing the net space inside the shell to below the standard value, so as to improve the protection performance of the photovoltaic module and make it meet the flameproof and explosion-proof requirements.

[0051] Example 3

[0052] Based on the first embodiment, the present embodiment further improves the strength of the main housing 10. Specifically, high-strength tempered glass is used to meet the test requirements of GB15763.2-2005.

[0053] The specific test method is:

[0054] A smooth steel ball with a diameter of 63.5 mm (mass of about 1040 g) is placed at a height of 1000 mm from the surface of the sample and allowed to fall freely. The impact point should be within 25 mm from the center of the sample. Each sample is impacted only once to observe whether it is damaged. The test is carried out at room temperature.

[0055] Different from the usual thinning design of conventional glass panels, the main shell 10 of this embodiment adopts higher-strength tempered glass, which can improve the mechanical strength and impact resistance of the component shell on the one hand; on the other hand, it can improve the light transmittance of the back of the component, thereby increasing power generation.

[0056] The explosion-proof design and enhanced strength of the main shell 10 of Examples 2 and 3 of the present application ensure that even if an internal explosion occurs under extreme conditions, the shell of the photovoltaic module will not break, and the burning flame will not spread to the external environment, thereby achieving explosion-proof performance of the photovoltaic module and enabling it to operate safely and reliably in an explosion-hazardous environment.

[0057] Example 4

[0058] Based on Examples 1-3, this embodiment further provides a manufacturing process for explosion-proof photovoltaic components, including the following steps:

[0059] The battery cell group 21 is laminated and fixed by sandwiching the battery cell group 21 with two layers of sealant, and the corresponding junction box 24 and the lead wire 22 are fixedly connected, so that the circuit part forms a whole, forming a battery unit of the photovoltaic module;

[0060] An integrally made plate-shaped rectangular parallelepiped structure with a mounting groove 11 at one end of the tempered glass material is used as the main housing 10 of the photovoltaic module;

[0061] The battery unit is placed into the main housing 10 through the mounting groove 11 , and the lead wires 22 are passed through the metal end cover 30 sealed and fixed to the open end surface of the main housing 10 .

[0062] Preferably, glue is poured into the main shell 10 for sealing to fill the net space inside the main shell 10 so that the net volume inside is less than 10cm 3 To meet the requirements of flameproof and explosion-proof enclosure.

[0063] Preferably, the lead wire 22 is passed through the lead wire hole 31 on the metal end cover 30 , and the gap between the lead wire hole 31 and the lead wire 22 is sealed with glue.

[0064] The internal circuit of the photovoltaic module of this embodiment can be isolated from the external environment, avoiding the explosion of the external environment caused by dangerous factors generated by the internal circuit under special conditions; at the same time, the mechanical strength of the photovoltaic module casing is enhanced, which can avoid the explosion inside the module from being transmitted to the external environment, and ensure that the casing components meet the flameproof and explosion-proof requirements, so that the photovoltaic module can be used in explosion-hazardous environments, expanding its use scenarios.

[0065] 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.

[0066] 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: The main body shell is an integral structure and has a hollow cavity and an end opening communicating with the hollow cavity; A battery unit, comprising an electrically connected battery cell group and a lead wire, wherein the battery cell group is accommodated in the hollow cavity, and the lead wire is led out from the front or back side of the battery cell group through the end opening; The end cover is fitted to the end opening and sealed and fixed.

2. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The hollow cavity is filled with protective glue, which makes the net volume in the main shell less than 10cm 3 , in order to meet the explosion-proof requirements of the main casing.

3. The explosion-proof photovoltaic assembly according to claim 1 or 2, characterized in that: The battery unit further includes a sealing layer coated on the outside of the battery cell group; and / or, The battery unit further comprises junction boxes evenly distributed in the left, middle and right regions of the back side of the battery cell group, and terminals for connecting the lead wires are arranged in the junction boxes.

4. The explosion-proof photovoltaic assembly according to claim 3, characterized in that: The main body shell is a plate-shaped rectangular parallelepiped structure, and its end opening and the hollow cavity together form a mounting groove adapted to the size of the battery unit.

5. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The material of the main shell is tempered glass that meets the testing requirements of GB15763.2-2005.

6. The explosion-proof photovoltaic assembly according to claim 1, characterized in that: The end cover is glued and / or screwed and / or clamped to the open end surface of the main shell.

7. The explosion-proof photovoltaic assembly according to claim 1 or 6, characterized in that: The end cover is provided with a wire lead-out hole corresponding to the lead-out wire, and the gap between the wire lead-out hole and the lead-out wire is filled with potting glue.

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