A photovoltaic module for use in the ocean

Abstract

The present invention is a photovoltaic module for the ocean, comprising a laminate, a fixing frame and a junction box; a slot is provided on the inner side of the fixing frame; the outer side of the laminate is clamped in the slot; a junction box is provided at the lower end of the laminate, and the junction box comprises a first connector and a second connector connected to each other; the laminate comprises: a generator, which converts solar energy into electrical energy; a package, which packages the generator inside; an upper cover, which is made of a transparent material and is installed on the upper side of the package, facing the sun; a lower cover, which is installed on the lower side of the package, facing away from the sun; an anti-reflection film, which is attached to the side of the upper cover facing the sun, for reducing the reflectivity of the upper cover; and a reflection-enhancing layer, which is arranged on the side of the lower cover close to the package, for increasing the reflectivity of the lower cover. The arrangement of the package, the upper cover and the lower cover enables the photovoltaic module to be resistant to high temperature and humidity, salt spray corrosion, and wave impact, and can operate stably at sea.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic components, in particular to a photovoltaic component used in the ocean. Background Art

[0002] Offshore photovoltaics is a new way of using marine energy and developing resources. The offshore environment is different from that on land. Under the same lighting conditions, the open sea surface, no obstructions, long sunshine hours, and high radiation make offshore photovoltaic projects more efficient in light utilization, and the power generation of offshore photovoltaic power stations is significantly increased.

[0003] However, the marine environment is complex and has the characteristics of high salt fog. When used at sea, photovoltaic modules are not only exposed to high temperature, high humidity and high salt fog for a long time, but also face the influence of special external conditions such as typhoon attacks, wave impacts, and long-term immersion. As a result, the life of photovoltaic modules is very short when operating in the marine environment.

[0004] Therefore, how to achieve long-term and stable operation of photovoltaic modules in a marine environment has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In order to solve the technical problems in the background technology, the present invention discloses a photovoltaic module for ocean.

[0006] The present invention provides a photovoltaic module for use in the ocean, comprising a laminate, a fixing frame and a junction box;

[0007] A card slot is arranged on the inner side of the fixed frame;

[0008] The outer side of the laminate is clamped in the clamping slot and connected and fixed to the fixing frame by adhesive;

[0009] The junction box is set on the backlight side of the laminate and is also fixed by adhesive connection;

[0010] The junction box includes a first connector and a second connector connected to each other;

[0011] The junction box also includes a first box body and a second box body mounted on the backlight side of adjacent laminates;

[0012] The other end of the first connector is connected to the first box body, and the other end of the second connector is connected to the second box body;

[0013] Laminates include:

[0014] Generator, converting solar energy into electrical energy;

[0015] A packaging body, in which the power generating body is packaged;

[0016] The upper cover plate is made of transparent material and is installed on the upper side of the package body, facing the sun;

[0017] A lower cover plate is installed on the lower side of the package body, facing away from the sun;

[0018] Anti-reflection film, affixed to the side of the upper cover plate facing the sun, used to reduce the reflectivity of the upper cover plate;

[0019] The reflection enhancing layer is arranged on a side of the lower cover plate close to the package body, and is used to improve the reflectivity of the lower cover plate.

[0020] The beneficial effects of the above-mentioned arrangement are: 1. The arrangement of the packaging body, the upper cover plate and the lower cover plate enables the photovoltaic module to be resistant to high temperature and humidity, salt spray corrosion, and wave impact, and can operate stably at sea; 2. The anti-reflection film is used to reduce the reflectivity of the upper cover plate, thereby increasing the light transmittance of the upper cover plate and improving the utilization rate of solar energy; the anti-reflection film is also used to prevent water vapor from passing through the upper cover plate into the power generation body; 3. The reflection-enhancing layer is used to increase the reflectivity of the lower cover plate, increase the amount of sunlight reflected to the power generation body, and thus improve the utilization rate of sunlight; 4. The protective structure is used to improve the waterproof performance of the junction box.

[0021] To further reduce the amount of water vapor passing through the upper cover plate, specifically: the anti-reflection film is composed of a first film layer and a second film layer stacked in sequence; the first film layer is attached to the upper cover plate; the porosity of the first film layer is 2%-20%, which is less than the porosity of the second film layer.

[0022] The package body has the following two structures, one of which is: the package body is composed of a packaged light receptor and a packaged backlight; the packaged light receptor and the packaged backlight are respectively located on the upper and lower sides of the power generation body; the material of the packaged light receptor and the packaged backlight is POE film or EPE film. Both films contain POE, a non-polar material, and have excellent water vapor barrier and ion barrier capabilities. The second is: the package body is composed of a packaged light receptor, a packaged backlight and a packaged side; the packaged light receptor and the packaged backlight are respectively located on the upper and lower sides of the power generation body; the packaged side is annular, and its inner side is bonded to the packaged light receptor and the packaged backlight; the packaged light receptor and the packaged backlight use a packaged adhesive with a water vapor permeability greater than 1.0g / ㎡ / 24h; the packaged side uses a packaged adhesive with a water vapor permeability less than 0.5g / ㎡ / 24h.

[0023] When the power generator adopts a main grid-free battery cell, if pre-fixing methods such as glue, tape, and carrier film are used to form an effective connection between the welding ribbon and the battery electrode during lamination, it is necessary to prevent the glue film from melting and flowing under the welding ribbon during lamination to hinder the combination of the welding ribbon and the electrode. Based on this, a further improvement is that a low-flow glue film is arranged between the packaged light receiving body and the power generator, and between the packaged backlight body and the power generator.

[0024] The junction box has the following three structures to enhance the mechanical connection strength and waterproof performance.

[0025] The first structure is: the first connector and the second connector are enclosed in a protective shell; the protective shell is fixedly connected to the laminate; the protective shell is composed of an upper shell and a lower shell arranged symmetrically, and the connection is sealed by a sealing body. The sealing body is used to block water vapor from entering the connector and prevent the positive and negative terminals of the connector from being loosened due to the impact of waves.

[0026] The second structure is: the first connector is integrally formed with the first box body; the second connector is connected to the second box body through a cable. In this way, the first connector and the second connector will not sag due to gravity after being connected, and will be at the same height as the first box body and the second box body, thereby reducing the probability of the connector being submerged in seawater and impacted by waves.

[0027] The third structure is: the first connector and the second connector are connected by a snap-on method; the snap-on end of the first connector is provided with two symmetrically arranged first snap-on holes, and two symmetrically arranged second snap-on holes; the snap-on end of the second connector is provided with a first snap-on tooth for snapping the first snap-on hole and a second snap-on tooth for snapping the second snap-on hole; the connection between the inner wall of the first connector and the second connector is sealed by a sealing ring, and the outer wall of the first connector and the second connector is sleeved and covered with a heat shrink tube; the heat shrink tube covers the connection between the first connector and the wiring, and covers the connection between the second connector and the wiring. The specific snap-on structure is: the snap-on end of the second connector is provided with a plug rod, and the plug rod is plugged into the snap-on end of the first connector; the snap-on end of the second connector is provided with a first connecting rod symmetrically arranged and extending in the direction of the first connector, the first snap tooth is provided at the end of the first connecting rod, and the first snap tooth faces outward; the snap-on end of the second connector is also provided with a second connecting rod symmetrically arranged and extending in the direction of the first connector, the second snap tooth is provided at the end of the second connecting rod, and the second snap tooth faces outward; when the first connector and the second connector are snap-oned, the first connecting rod and the second connecting rod are plugged into the first connector. In this way, the first connector and the second connector are more firmly connected, and their resistance to external forces can be enhanced. In addition, a sealing ring is arranged inside the connection between the first connector and the second connector, and a heat shrink tube is sleeved outside to improve their waterproof performance.

[0028] The beneficial effects of the present invention are: 1. The arrangement of the packaging body, the upper cover plate and the lower cover plate enables the photovoltaic module to be resistant to high temperature and humidity, salt spray corrosion, and wave impact, and can operate stably at sea; 2. The anti-reflection film is used to reduce the reflectivity of the upper cover plate, thereby increasing the light transmittance of the upper cover plate and improving the utilization rate of solar energy; the anti-reflection film is also used to prevent water vapor from penetrating the upper cover plate into the power generation body; 3. The reflection-enhancing layer is used to increase the reflectivity of the lower cover plate, increase the amount of sunlight reflected to the power generation body, and thus improve the utilization rate of sunlight; 4. The protective structure is used to improve the waterproof performance of the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of the first structure of the laminate;

[0032] Figure 3 is a schematic diagram of the structure of the second structure of the laminate;

[0033] Figure 4 is a schematic diagram of the structure of the third structure of the laminate;

[0034] Figure 5 is a schematic diagram of the structure of the fourth structure of the laminate;

[0035] Figure 6 It is a structural schematic diagram of the upper cover;

[0036] Figure 7 It is a structural diagram of the first structure of the junction box;

[0037] Figure 8 It is a structural diagram of the second structure of the junction box;

[0038] Fig. 9 It is a structural diagram of the third structure of the junction box;

[0039] In the figure: 1, power generating body; 2, packaging body; 3, upper cover plate; 4, lower cover plate; 5, anti-reflection film; 7, laminate; 8, fixing frame; 9, adhesive; 10, first connector; 11, second connector; 12, protective shell; 13, sealing body; 14, first box body; 15, second box body; 16, junction box; 17, sealing ring; 18, heat shrink tube; 19, cable; 21, packaged photoreceptor; 22, packaged backlight body; 23, package side; 24, low-flow adhesive film; 51, first film layer; 52, second film layer; 81, card slot; 101 first card hole; 102, second card hole; 111, first card tooth; 112, second card tooth; 113, plug rod; 114, first connecting rod; 115, second connecting rod; 121, upper shell; 122, lower shell. DETAILED DESCRIPTION

[0040] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0041] Embodiment 1:

[0042] like Figure 1As shown, the present invention discloses a photovoltaic module for use in the ocean, comprising a laminate 7 and a fixing frame 8.

[0043] The laminate 7 includes a generator 1, a packaging body 2, an upper cover plate 3 and a lower cover plate 4. The generator 1 converts solar energy into electrical energy; the packaging body 2 packages the generator 1 therein; the upper cover plate 3 is made of a transparent material and is installed on the upper side of the packaging body 2, facing the sun; the lower cover plate 4 is installed on the lower side of the packaging body 2, facing away from the sun.

[0044] like Figure 2 As shown, the package body 2 is composed of a packaged light receptor 21 and a packaged backlight 22; the packaged light receptor 21 and the packaged backlight 22 are respectively located on the upper and lower sides of the power generation body 1; the material of the packaged light receptor 21 and the packaged backlight 22 is POE film or EPE film. Both films contain non-polar material POE, which has excellent water vapor barrier and ion barrier capabilities.

[0045] The material of the upper cover plate 3 is physical tempered glass or chemical tempered glass. Sunlight needs to pass through the upper cover plate 3 and the package body 2 to reach the generator 1, and be absorbed by the generator 1 to produce a photovoltaic effect, so the higher the transmittance of the upper cover plate 3, the better. The transmittance of tempered glass = 1-absorption rate-reflectivity. The light absorption rate of glass is small. The best way to increase the transmittance is to reduce the reflectivity. Therefore, an anti-reflection film 5 is coated on the side of the upper cover plate 3 facing the sun, which can increase the reflectivity of the cover plate 1 and thus increase its transmittance. The relationship between the reflectivity and the refractive index satisfies the following relationship: n1 and n2 are the refractive indices of light in two adjacent different media. The refractive index of the anti-reflection film 5 layers and its porosity satisfy the following relationship n p 2 =(n x 2 -1)(1-p)+1,n x is the refractive index of a completely non-porous material; n p is the refractive index of the anti-reflection film 5 after adding pores, and p is the porosity of the film material.

[0046] like Figure 6As shown, the anti-reflection film 5 is composed of a first film layer 51 and a second film layer 52 stacked in sequence; the first film layer 51 is attached to the upper cover plate 3, the porosity p of the first film layer 51 is 2%-20%, the thickness is 60-100nm; the refractive index n is 1.3-1.5, and the second film layer 52 is attached to the first film layer 51, the porosity of the first film layer 51 is 30%-60%, the thickness is 100-140nm, and the refractive index is 1.0-1.4. When water vapor enters the upper cover plate 3, the silicate in the photovoltaic glass is hydrolyzed to generate metal hydroxide, which will destroy the coating layer. Therefore, the dense first film layer 51, as the bottom film, can well block the water vapor in the air from reaching the inside of the photovoltaic glass, thereby reducing the hydrolysis reaction of the silicate in the photovoltaic glass and improving the weather resistance of the photovoltaic module.

[0047] The visible light absorptivity of the upper cover plate 3 is less than 1%, and the reflectivity R=R1+R2+R3+R4, R≤5%.

[0048] The lower cover plate 4 includes but is not limited to tempered glass, aluminum-containing backplane (coating / aluminum foil / PET / coating), non-aluminum water-blocking backplane (coating / organic barrier layer / PET / coating). Tempered glass and aluminum-containing backplanes have zero water permeability, and the water vapor permeability of non-aluminum water-blocking backplanes is ≤0.1g / ㎡ / day. Tempered glass is preferred. The side of the lower cover plate 4 facing the package body 2 is coated with a reflection-enhancing layer. The reflection-enhancing layer can be a high-reflection ceramic coating or an aluminum-containing high-reflection gap film tape, and its reflectivity is ≥80%, which is used to improve the reflectivity of the lower cover plate 4 and increase the utilization rate of light by the battery cell. The lower cover plate 4 is provided with lead holes, and the circuit of the generator 1 is connected to the junction box 16 through the lead holes.

[0049] The fixing frame 8 has two long sides and two short sides, and the intersection of the long sides and the short sides is connected by an angle code. The fixing frame 8 is made of aluminum alloy. The surface of the fixing frame 8 is anodized, and the thickness of the anodized film is ≥AA15.

[0050] The aluminum alloy fixing frame 8 can be made by first opening the mounting hole and then performing anodizing, or first performing anodizing and then opening the mounting hole, and a protective layer is applied to the surface section and the surrounding of the mounting hole, and the protective layer is anti-rust paint or insulating glue, etc. The intersection of the long side and the short side of the aluminum alloy fixing frame 8 is coated with anti-rust paint.

[0051] A card slot 81 is provided on the inner side of the fixing frame 8; the laminate 7 and the fixing frame 8 are connected and fixed by an adhesive 9; the laminate 7 and the fixing frame 8 are connected and fixed by an adhesive 9; a junction box 16 is provided at the lower end of the laminate 7, which is also connected and fixed by an adhesive 9; the junction box 16 includes a first connector 10 and a second connector 11 that are connected to each other, and also includes a first box body 14 and a second box body 15 installed on the backlight side of the adjacent laminate 7.

[0052] like Figure 7As shown, the first connector 10 and the second connector 11 are enclosed in a protective shell 12; the protective shell 12 is fixedly connected to the laminate 7; the protective shell 12 is composed of an upper shell 121 and a lower shell 122 arranged symmetrically, and the connection is sealed by a sealing body 13. The sealing body 13 is used to block water vapor from entering the connector and prevent the positive and negative terminals of the connector from being loosened due to the impact of waves.

[0053] The arrangement of the packaging body 2, the upper cover plate 3 and the lower cover plate 4 enables the photovoltaic module to be resistant to high temperature and humidity, salt spray corrosion, and wave impact, and can operate stably at sea; the anti-reflection film 5 is used to reduce the reflectivity of the upper cover plate 3, thereby increasing the light transmittance of the upper cover plate 3 and improving the utilization rate of solar energy; the anti-reflection film 5 is also used to prevent water vapor from passing through the upper cover plate 3 into the power generation body 1; the reflection-enhancing layer is used to increase the reflectivity of the lower cover plate 4, increase the amount of sunlight reflected to the power generation body 1, and thus improve the utilization rate of sunlight.

[0054] Embodiment 2:

[0055] Compared with the first embodiment, the difference is: Figure 3 As shown, the packaging body 2 is composed of a packaging light receptor 21, a packaging backlight 22 and a packaging side portion 23; the packaging light receptor 21 and the packaging backlight 22 are respectively located on the upper and lower sides of the power generating body 1; the packaging side portion 23 is annular, and its inner side is in contact with the packaging light receptor 21 and the packaging backlight 22; the packaging light receptor 21 and the packaging backlight 22 are made of EVA with a water vapor transmission rate greater than 1.0g / ㎡ / 24h; the packaging side portion 23 is made of butyl glue with a water vapor transmission rate less than 0.5g / ㎡ / 24h.

[0056] Embodiment three:

[0057] Compared with the first or second embodiment, the difference is: Figure 3 and Figure 5 As shown, a low-flow adhesive film 24 is provided between the packaged light-receiving body 21 and the power generation body 1, and between the packaged backlight body 22 and the power generation body 1; low flowability can be achieved by using pre-crosslinking treatment or low-flowability ions, with a pre-crosslinking degree of 30%-50% and a thickness of 50μm-150μm. The reason for such design is that when the power generation body 1 uses a main grid-free battery cell, if a pre-fixing method such as glue, tape, carrier film, etc. is used, an effective connection between the welding strip and the battery electrode is formed during lamination, and it is necessary to prevent the adhesive film from melting and flowing under the welding strip during lamination to hinder the combination of the welding strip and the electrode.

[0058] Embodiment 4:

[0059] Compared with the first embodiment, the second embodiment or the third embodiment, the difference is: Figure 8As shown, the first connector 10 is integrally formed with the first box body 14; the second connector 11 is connected to the second box body 15 via a cable 19. In this way, the first connector 10 and the second connector 11 will not sag due to gravity after being connected, and are at the same height as the first box body 14 and the second box body 15, thereby reducing the probability of the connectors being submerged in seawater and impacted by waves.

[0060] Embodiment six:

[0061] Compared with the first embodiment, the second embodiment or the third embodiment, the difference is: Fig. 9 As shown, the first connector 10 and the second connector 11 are connected by snapping; the snapping end of the first connector 10 is provided with two symmetrically arranged first snapping holes 101, and two symmetrically arranged second snapping holes 102; the snapping end of the second connector 11 is provided with a first snapping tooth 111 snapping into the first snapping hole 101 and a second snapping tooth 112 snapping into the second snapping hole 102. The specific clamping structure is as follows: the clamping end of the second connector 11 is provided with an insertion rod 113, which is plugged into the clamping end of the first connector 10; the clamping end of the second connector 11 is provided with a first connecting rod 114 which is symmetrically arranged and extends toward the first connector 10, and a first clamping tooth 111 is provided at the end of the first connecting rod 114, and the first clamping tooth 111 faces outward; the clamping end of the second connector 11 is also provided with a second connecting rod 115 which is symmetrically arranged and extends toward the first connector 10, and a second clamping tooth 112 is provided at the end of the second connecting rod 115, and the second clamping tooth 112 faces outward; when the first connector 10 and the second connector 11 are clamped, the first connecting rod 114 and the second connecting rod are plugged into the first connector 10. In this way, the connection between the first connector 10 and the second connector 11 is more firmly established, and its resistance to external forces can be enhanced. In addition, a sealing ring 17 is provided inside the connection between the first connector 10 and the second connector 11, and a heat shrink tube 18 is provided outside to improve its waterproof performance. Since the present embodiment is used in a marine environment, two sealing rings 17 are provided to improve the sealing performance, and the sealing ring 17 is preferably an M-shaped sealing ring, which has a better sealing performance.

[0062] Embodiment seven:

[0063] Compared with the first embodiment, the difference is that the fixing frame 8 is made of glass fiber reinforced polyurethane composite material (Glassfiber Reinforced Polyurethane). The surface of the fixing frame 8 has a protective coating, and the coating material includes but is not limited to water-based polyurethane coating, polyolefin resin coating, fluorine-containing polymer, etc., and the film thickness is ≥AA30.

[0064] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A photovoltaic module for use in the ocean, characterized in that: It comprises a laminated part (7), a fixing frame (8) and a junction box (16); A card slot (81) is provided on the inner side of the fixing frame (8); The outer side of the laminate (7) is clamped in the clamping groove (81) and is connected and fixed to the fixing frame (8) via an adhesive (9); The junction box (16) is arranged on the backlight side of the laminate (7) and is also connected and fixed by the adhesive (9); The junction box (16) comprises a first connector (10) and a second connector (11) connected to each other; The junction box (16) further comprises a first box body (14) and a second box body (15) mounted on the backlight side of the adjacent laminate (7); The other end of the first connector (10) is connected to the first box body (14), and the other end of the second connector (11) is connected to the second box body (15); The laminate (7) comprises: A generator (1) converts solar energy into electrical energy; A packaging body (2) for packaging the power generating body (1) therein; An upper cover plate (3) is made of a transparent material and is installed on the upper side of the packaging body (2) and faces the sun; A lower cover plate (4) is installed on the lower side of the packaging body (2) and faces away from the sun; An anti-reflection film (5) is attached to the side of the upper cover plate (3) facing the sun and is used to reduce the reflectivity of the upper cover plate (3); The reflection-enhancing layer is arranged on a side of the lower cover plate (4) close to the packaging body (2) and is used to improve the reflectivity of the lower cover plate (4).

2. A photovoltaic module for use in the ocean according to claim 1, characterized in that: The anti-reflection film (5) is composed of a first film layer (51) and a second film layer (52) stacked in sequence; The first film layer (51) is bonded to the upper cover plate (3); The porosity of the first film layer (51) is 2%-20%, which is smaller than the porosity of the second film layer (52).

3. A photovoltaic module for use in the ocean according to claim 1, characterized in that: The package body (2) is composed of a packaged light receiving body (21) and a packaged backlight body (22); The packaged light receiving body (21) and the packaged backlight body (22) are respectively located on the upper and lower sides of the power generating body (1); The material of the packaged light receiving body (21) and the packaged backlight body (22) is POE adhesive film or EPE adhesive film.

4. A photovoltaic module for use in the ocean according to claim 1, characterized in that: The package body (2) is composed of a packaged light receiving body (21), a packaged backlight body (22) and a packaged side portion (23); The encapsulated light receiving body (21) and the encapsulated backlight body (22) are respectively located on the upper and lower sides of the power generating body (1); The packaging side portion (23) is annular, and its inner side is in contact with the packaging light receiving body (21) and the packaging backlight body (22); The encapsulated light receiving body (21) and the encapsulated backlight body (22) are encapsulated with an encapsulating glue having a water vapor transmission rate greater than 1.0 g / ㎡ / 24h; The packaging side portion (23) uses packaging glue with a water vapor transmission rate of less than 0.5g / ㎡ / 24h.

5. A photovoltaic module for use in the ocean according to claim 3 or 4, characterized in that: A low-flow adhesive film (24) is provided between the packaged light-receiving body (21) and the power-generating body (1), and between the packaged backlight body (22) and the power-generating body (1).

6. A photovoltaic module for use in the ocean according to claim 1, characterized in that: The first connector (10) and the second connector (11) are enclosed in a protective shell (12); The protective shell (12) is composed of an upper shell (121) and a lower shell (122) which are symmetrically arranged, and the connection between the upper shell and the lower shell is sealed by a sealing body (13).

7. The photovoltaic module for use in the ocean according to claim 1, characterized in that: The first connector (10) and the first box body (14) are integrally formed; The second connector (11) is connected to the second box body (15) via a cable (19).

8. The photovoltaic module for use in the ocean according to claim 1, characterized in that: The first connector (10) and the second connector (11) are connected by snap-fitting; The card connection end of the first connector (10) is provided with two symmetrically arranged first card holes (101) and two symmetrically arranged second card holes (102); The engaging end of the second connector (11) is provided with a first engaging tooth (111) engaging with the first engaging hole (101) and a second engaging tooth (112) engaging with the second engaging hole (102); The connection between the inner walls of the first connector (10) and the second connector (11) is sealed by a sealing ring (17), and the outer walls of the first connector (10) and the second connector (11) are sleeved with a heat shrink tube (18); The heat shrink tube (18) covers the connection between the first connector (10) and the wiring, and covers the connection between the second connector (11) and the wiring.

9. A photovoltaic module for use in the ocean according to claim 8, characterized in that: The clamping end of the second connector (11) is provided with an insertion rod (113), and the insertion rod (113) is inserted into the clamping end of the first connector (10); The clamping end of the second connector (11) is provided with a first connecting rod (114) which is symmetrically arranged and extends toward the first connector (10), and the first clamping tooth (111) is provided at the end of the first connecting rod (114), and the first clamping tooth (111) faces outward; The clamping end of the second connector (11) is also provided with a second connecting rod (115) which is symmetrically arranged and extends toward the first connector (10); the second clamping tooth (112) is provided at the end of the second connecting rod (115), and the second clamping tooth (112) faces outward; When the first connector (10) and the second connector (11) are connected, the first connecting rod (114) and the second connecting rod (115) are inserted into the first connector (10).

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