CN111565023B - A photovoltaic junction box - Google Patents

Abstract

The present application discloses a photovoltaic junction box, comprising an outer shell (1) with an open upper end, the opening of the outer shell (1) is covered with an outer cover plate (2); the outer shell (1) is provided with Several terminal sealing shells (3) with upper openings, the terminal sealing shells (3) are arranged at intervals, the openings of the terminal sealing shells (3) are covered with internal cover plates (4), the terminal sealing shells The body (3) and the outer casing (1) are relatively fixed; the two opposite side surfaces of the outer casing (1) are respectively provided with a number of incoming wire terminals (5) with openings at both ends, and the terminal sealing shell A plurality of incoming through-holes (6) are respectively arranged on two opposite side surfaces of the body (3). The advantage of the present invention is that the photovoltaic junction box can transmit and dissipate internal heat under the condition of better sealing, so as to prevent the photovoltaic junction box from overheating.

Description

A photovoltaic junction box

technical field

The invention relates to a photovoltaic junction box and a working method, belonging to the field of photovoltaic equipment.

Background technique

Photovoltaic is the abbreviation of solar photovoltaic power generation system. It is a new type of power generation system that uses the photovoltaic effect of solar cell semiconductor materials to directly convert solar radiation energy into electrical energy. There are two modes of independent operation and grid-connected operation. At the same time, the classification of solar photovoltaic power generation systems, one is centralized, such as large-scale Northwest ground photovoltaic power generation systems; the other is distributed (with >6MW as the boundary), such as industrial and commercial enterprise factory roof photovoltaic power generation systems, residential roof photovoltaic power generation systems. Photovoltaic junction box is a connection device between the solar cell square array composed of solar cell components and the solar charging control device. Its main function is to connect and protect solar photovoltaic components, connect the power generated by solar cells with external lines, and conduct photovoltaic current generated by the component. The photovoltaic junction box will heat up due to the current during the working process, but the existing photovoltaic junction box does not leave cooling holes on the surface in order to ensure the sealing, so that the photovoltaic junction box sometimes overheats during the working process. Overheating of the photovoltaic junction box will cause rapid aging of the photovoltaic junction box, reduce the insulation between the terminals inside the photovoltaic junction box, and affect the stability and service life of the photovoltaic junction box.

Contents of the invention

The technical solution of the present invention provides a photovoltaic junction box, which can effectively realize heat dissipation in the photovoltaic junction box, thereby greatly improving the stability and safety of the internal components of the junction box.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is that a photovoltaic junction box includes an outer shell with an upper end opening, and the opening of the outer shell is covered with an outer cover plate; the outer shell is provided with several upper end openings The terminal sealing shells are arranged at intervals between the terminal sealing shells, the opening of the terminal sealing shells is covered with an internal cover plate, and the terminal sealing shells are relatively fixed with the external shell; the external shells The two opposite side surfaces are respectively provided with a number of incoming wire ends with openings at both ends, and the two opposite side surfaces of the terminal sealing shell are respectively provided with several incoming line through holes; the terminal sealing shell is provided with The conductive sheet, the conductive sheet is fixedly arranged in the terminal sealing shell, and a U-shaped fixed line card is arranged at both ends of the conductive sheet; a diode is arranged between the conductive sheets in the two adjacent terminal sealing shells, and the diode The terminals at both ends pass through the side wall of the terminal sealing shell and are electrically connected to the conductive sheet; the sealing shell of the terminal is filled with insulating heat-conducting glue, and the space between the sealing shell of the terminal and the outer shell is filled with heat-conducting silicone grease , On the surface of the outer shell opposite to the outer cover plate, a window is provided through the surface of the outer shell, the window is covered with a heat dissipation metal plate, and the inner cover plate is a metal cover plate.

In the technical solution of the present application, a plurality of terminal sealing housings are arranged in the external housing, and the terminals of each connection between the solar cell square array and the solar charging control device are respectively arranged in a terminal sealing housing, which improves the The insulation sealing between each terminal improves the safe use of the photovoltaic junction box. The wires to be connected are respectively connected to the conductive sheet through the fixed wire clips at both ends of the conductive sheet. The sealing shell of the terminal is filled with insulating and heat-conducting adhesive, and the insulating and heat-conducting adhesive wraps the conductive sheet and the exposed end of the wire, which can improve the insulation of the sealing shell of the terminal. Sealing, and can make the heat inside the sealed housing of the terminal be transferred to the inner metal cover plate as soon as possible, so as to improve the heat dissipation of the sealed housing of the terminal. The heat-conducting silicone grease filled between the terminal sealing shell and the external shell can transfer the heat in the external shell to the heat-dissipating metal plate as soon as possible, improving the heat dissipation of the entire photovoltaic junction box. The insulating and heat-conducting glue filled in the sealing shell of the terminal can be a two-component insulating and heat-conducting glue for power batteries.

Optimally, in the above-mentioned photovoltaic junction box, a U-shaped internal partition is arranged in the external housing, and the terminal sealing shell is fixedly arranged in the internal partition; the U-shaped bottom end surface of the internal partition is provided with a plurality of sliding There are several fins on both sides of the sealing shell of the terminal, nuts are arranged in the slideways, and fastening bolts are arranged on the fins, and the fastening bolts pass through the fins and are threadedly connected with the nuts in the slideways; The two U-shaped side surfaces of the partition are respectively provided with a plurality of through holes which are matched with the wire-entry ends.

Existing photovoltaic junction boxes have several specifications of single-wire, double-wire, three-wire and four-wire. In this application, the terminal sealing shell is fixed on the internal partition through the slideway, and then the internal partition is placed in the external shell. During production, it is only necessary to make external shells of different specifications, and then cut off the corresponding length The internal partition and the sealing shell of the terminal can be adapted to the external shell of different specifications. Compared with the integral molding of the terminal sealing shell and the external shell at the same time when making the external shell, the technical solution of this application The production and manufacturing cost can be saved, and when a part of the sealing shell of the terminal, the inner partition and the outer shell are aged or damaged, only the corresponding aging parts need to be replaced, thereby saving the cost of use and maintenance. In order to facilitate installation, corresponding indentations can be set on the internal partition, and it is sufficient to break off at the indentations during installation.

Optimally, in the above-mentioned photovoltaic junction box, the two inner surfaces of the outer housing provided with the incoming wire end are respectively provided with an internal partition board, and the internal partition board is provided with a The perfusion and sealing cavity, the opening of the perfusion and sealing cavity faces the inner surface of the outer shell provided with the inlet end, the surface of the perfusion and sealing cavity is arranged on the internal partition plate and the inner wall of the external shell is bonded and fixed, and the internal partition plate The two ends of the two ends are attached and fixed to the inner wall of the outer shell, and the outer shell and the inner partition plate are integrally formed; the filling and sealing cavity is filled with sealant, and the inner partition plate is provided with through holes; the internal partition plate is provided with a step protrusion, the lower end surface of the internal partition is attached to the step protrusion, and the two U-shaped side surfaces of the internal partition are respectively attached to the two internal partitions On the surface of the board provided with through holes.

In this application, the perfusion sealing cavity formed by the internal partition plate and the inner wall of the external housing forms a sealing cavity at the opening where the inlet end faces the opening of the external housing, and the sealant poured in the perfusion sealing cavity fills the inlet end Facing the opening in the outer casing, the sealing performance of the wire inlet facing the opening in the outer casing is improved, preventing water from entering the wire inlet. The sealant poured into the perfusion sealing cavity can be a special sealant for SMG533 solar cell components or a silicone potting compound for solar cell components.

Optimally, in the above-mentioned photovoltaic junction box, the terminal sealing shell is provided with two internal partition plates 2, the internal partition plate 2 is an L-shaped bent plate, and the two internal partition plates 2 are respectively arranged on the terminal sealing One of the L-shaped bent ends of the internal partition plate 2 is fixed to the inner surface of the terminal sealing shell provided with the incoming line through hole on the two inner surfaces of the shell, and the internal partition The other L-shaped bending end of plate 2 is fixed to the inner bottom surface of the terminal sealing shell, the other two ends of the internal partition plate 2 are fixed to the inner wall of the terminal sealing shell, and the internal partition plate 2 is connected to the terminal A perfusion and sealing cavity two is formed between the inner walls of the sealing shell; the perfusion and sealing cavity two is filled with sealant, and the internal partition plate two is provided with a through hole that cooperates with the incoming line through hole.

In this application, the perfusion sealing cavity two formed by the internal partition plate two and the inner wall of the terminal sealing housing forms a sealing cavity at the opening where the incoming line through hole faces the terminal sealing housing, and the perfusion sealing cavity two The sealing glue poured in fills the opening of the incoming through hole facing the sealing shell of the terminal, which improves the sealing performance of the sealing shell of the terminal and prevents water from entering the sealing shell of the terminal. The sealant poured into the filling and sealing chamber 2 can be a special sealant for SMG533 solar cell components or a silicone potting compound for solar cell components.

Optimally, in the above-mentioned photovoltaic junction box, the U-shaped bottom end surface of the internal partition and the internal bottom end surface provided with windows on the external shell are spaced apart to form a bottom waterproof cavity, and the bottom waterproof cavity is filled with heat-conducting silicon Grease; the U-shaped bottom end surface of the internal partition is provided with a number of heat dissipation through holes, and the U-shaped bottom end surface of the internal partition is fitted with heat sinks, and the heat sink is glued to the outer surface of the internal partition.

In this application, the heat dissipated from the sealing shell of the terminal is transferred to the internal partition, and then transferred to the bottom waterproof cavity through the through hole on the U-shaped bottom end surface of the internal partition. The thermal conductive silicone grease is poured into the bottom waterproof cavity, which is conducive to the heat transfer to the bottom waterproof cavity and the heat transfer to the heat dissipation metal plate. In addition, the heat-conducting silicone grease has better waterproof sealing performance, which can prevent water from entering the gap between the heat-dissipating metal plate and the outer casing from entering the outer casing. The heat sink covers and fits the through hole on the U-shaped bottom surface of the internal partition to prevent the water leaking through the bottom waterproof cavity from leaking to the terminal sealing shell through the through hole on the U-shaped bottom surface of the internal partition .

Optimally, in the above-mentioned photovoltaic junction box, the heat dissipation metal plate is attached to the inner bottom end surface of the outer casing and fixed by bolts, the heat dissipation metal plate is provided with an annular groove, and the annular groove surrounds the inner bottom of the outer casing The window is arranged on the end face, and the opening of the groove faces the inner bottom end face of the outer shell and is filled with sealant.

In this application, the grooves on the heat dissipation metal plate are filled with sealant, which can prevent water from entering the outer casing from the gap between the heat dissipation metal plate and the outer casing, and improve the sealing performance of the entire photovoltaic junction box.

Optimally, in the above-mentioned photovoltaic junction box, the internal partitions, internal partitions, and slideways are integrally formed.

In the present application, the internal partition board, the internal partition board and the slideway are integrally arranged, which improves the overall strength of the internal partition board and prolongs the service life.

Optimally, in the above-mentioned photovoltaic junction box, a plurality of fixing screws are arranged on the outer cover plate, and the fixing screws pass through the outer cover plate, the inner partition plate, the heat dissipation metal plate, and the inner bottom end surface of the outer shell and are fixed by threads; A number of grouting holes are arranged on the internal partition plate, and the external cover plate is attached to the surface of the internal partition plate facing the external cover plate, and the surface of the internal partition plate facing the external cover plate is coated with sealant.

In this application, the outer cover plate and the heat dissipation metal plate are fixed on the outer casing by fixing screws, and the U-shaped opening end of the inner partition is attached to the outer cover, so that the inner partition is fixed in the outer casing. The sealant applied on the surface of the inner divider facing the outer cover improves the watertight seal between the outer cover and the inner divider.

Optimally, in the above-mentioned photovoltaic junction box, a current detection module is arranged between two adjacent terminal sealing shells, the current detection module is fixed on the slideway, and the two detection ends of the current detection module are respectively electrically connected to the two ends of the diode , the output end of the current detection module passes through the bottom end surface of the terminal sealing shell and the heat dissipation metal plate, and the output end of the current detection module passes through the perforation of the heat dissipation metal plate and is sealed with glue.

In this application, the current detection module detects the current at both ends of the diode. If the diode is broken down, the current detection module transmits the current signal to the control terminal, so that the control terminal can remotely obtain the working conditions of the photovoltaic junction box.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention;

Fig. 2 is a top view internal structure schematic diagram of the present invention.

Detailed ways

The technical characteristics of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in the figure, the present invention is a photovoltaic junction box, which includes an outer casing 1 with an open upper end, and an outer cover plate 2 is covered on the opening of the outer casing 1; The terminal sealing shell 3 is arranged at intervals between the terminal sealing shells 3, the opening of the terminal sealing shell 3 is covered with an inner cover plate 4, and the terminal sealing shell 3 is relatively fixedly arranged with the outer shell 1; The two opposite side surfaces of the external housing 1 are respectively provided with a plurality of inlet terminals 5 with open ends, and the two opposite side surfaces of the terminal sealing shell 3 are respectively provided with a plurality of inlet through holes 6; The terminal sealing shell 3 is provided with a conductive sheet 7, the conductive sheet 7 is fixedly arranged in the terminal sealing casing 3, and a U-shaped fixed line card 8 is respectively provided at both ends of the conductive sheet 7; A diode 9 is arranged between the conductive sheets 7 in the two terminal sealing shells 3, and the terminals at both ends of the diode 9 pass through the sidewall of the terminal sealing shell 3 and are electrically connected to the conductive sheet 7; the terminal sealing The housing 3 is filled with insulating and heat-conducting glue, and the space between the terminal sealing housing 3 and the outer housing 1 is filled with heat-conducting silicone grease. On the surface of the outer housing 1 opposite to the outer cover plate 2, there is a hole through the outer housing. The window 10 on the surface of the body 1 is covered with a heat dissipation metal plate 11, and the inner cover plate 4 is a metal cover plate.

In the technical solution of the present application, a number of terminal sealing casings 3 are arranged in the outer casing 1, and the terminals of each connection between the solar battery array and the solar charging control device are respectively arranged in a terminal sealing casing 3, the insulation sealing between each terminal is improved, so that the safe use of the photovoltaic junction box is improved. The wires to be connected are respectively connected to the conductive sheet 7 through the fixed wire clips 8 at both ends of the conductive sheet 7, and the terminal sealing shell 3 is filled with insulating heat-conducting glue, and the insulating heat-conducting glue wraps the conductive sheet 7 and the bare end of the wire, which can improve the connection efficiency. The insulation sealing performance of the terminal sealing shell 3 can make the heat inside the terminal sealing shell 3 transfer to the metal inner cover plate 4 as soon as possible, and improve the heat dissipation of the terminal sealing shell 3 . The thermally conductive silicone grease filled between the terminal sealing shell 3 and the outer shell 1 can transfer the heat in the outer shell 1 to the heat dissipation metal plate 11 as soon as possible, improving the heat dissipation of the entire photovoltaic junction box. The insulating and heat-conducting glue filled in the terminal sealing shell 3 can be a two-component insulating and heat-conducting glue for power batteries.

The outer shell 1 is provided with a U-shaped internal partition 16, and the terminal sealing shell 3 is fixedly arranged in the internal partition 16; the U-shaped bottom end surface of the internal partition 16 is provided with several slideways, and the terminal Both sides of the sealed housing 3 are respectively provided with several fins 18, nuts are provided in the slideway, and fastening bolts 19 are arranged on the fins 18, and the fastening bolts 19 pass through the fins 18 and are threadedly connected with the nuts in the slideway; The two U-shaped side surfaces of the inner partition 16 are respectively provided with a plurality of through holes which are arranged in cooperation with the wire inlet 5 .

Existing photovoltaic junction boxes have several specifications of single-wire, double-wire, three-wire and four-wire. In this application, the terminal sealing shell 3 is fixed on the internal partition 16 through the slideway, and then the internal partition 16 is placed in the external casing 1. During production, only the external casing 1 with different specifications is required. , and then intercept the internal partition 16 of the corresponding length and fix the terminal sealing shell 3 to adapt to the external shell 1 of different specifications. Compared with making the external shell 1, the terminal sealing shell 3 and the external shell The body 1 is integrally molded by injection molding. The technical solution of the present application can save manufacturing costs, and when a part of the terminal sealing shell 3, the inner partition 16 and the outer shell 1 are aged or damaged, only the corresponding aging parts need to be replaced. Parts are enough, saving use and maintenance costs. For the convenience of installation, corresponding indentations can be set on the internal partition 16, and it is enough to break off at the indentations during installation.

The two inner surfaces of the outer casing 1 provided with the wire inlet 5 are respectively provided with an internal partition plate 12, and the internal partition plate 12 is provided with a perfusion seal arranged along the length extension direction of the internal partition plate 12. Cavity 13, the opening of the perfusion and sealing cavity 13 faces the inner surface of the outer casing 1 provided with the wire inlet 5, and the surface of the inner partition plate 12 provided with the perfusion and sealing cavity 13 is bonded to the inner wall of the outer casing 1 fixed, the two ends of the inner partition plate 12 are attached and fixed to the inner wall of the outer casing 1, and the outer casing 1 and the inner partition plate 12 are integrally formed; the filling and sealing cavity 13 is filled with sealant, and the inner Part of the partition plate 12 is provided with a through hole cooperating with the wire inlet terminal 5; the internal partition plate 12 is provided with a step protrusion 17, and the lower end surface of the internal partition plate 16 fits on the step protrusion 17, and the inner The two U-shaped side surfaces of the partition 16 are attached to the surfaces provided with the through holes on the two internal partitions 12 respectively.

In this application, the perfusion sealing cavity 13 formed by the inner partition plate 12 and the inner wall of the outer casing 1 forms a sealing cavity at the opening of the inlet end 5 towards the inside of the outer casing 1 , and in the perfusion sealing cavity 13 The poured sealant fills the opening of the wire inlet 5 towards the inside of the outer casing 1 , which improves the sealing performance of the opening of the wire inlet 5 toward the inside of the outer casing 1 and prevents water from entering the wire inlet 5 . The sealant poured into the filling and sealing cavity 13 may be a special sealant for SMG533 solar cell components or a silicone potting compound for solar cell components.

The terminal sealing shell 3 is provided with two internal partition plates 2 14, the internal partition plate 2 14 is an L-shaped bent plate, and the two internal partition plates 14 are respectively arranged on the terminal sealing shell 3 On the two inner surfaces provided with the incoming line through hole 6, one of the L-shaped bent ends of the internal partition plate 2 14 is fixed to the inner surface of the terminal sealing shell 3 provided with the incoming line through hole 6, and the inner The other L-shaped bent end of the partial partition plate 2 14 is fixed to the inner bottom end surface of the terminal sealing shell 3, and the other two ends of the internal partition plate 2 14 are fixed to the inner wall of the terminal sealing shell 3, and the inner part A perfusion sealing cavity 2 15 is formed between the partition plate 2 14 and the inner wall of the terminal sealing shell 3; the perfusion sealing cavity 2 15 is filled with sealant, and the internal partition plate 2 14 is provided with a through hole for the incoming line 6 through-holes matched with the setting.

In this application, the perfusion sealing cavity 15 formed by the inner partition plate 2 14 and the inner wall of the terminal sealing housing 3 forms a sealing cavity at the opening of the incoming line through hole 6 towards the terminal sealing housing 3, The sealant poured in the filling and sealing chamber 2 15 fills the opening of the wire inlet through hole 6 towards the terminal sealing housing 3, which improves the sealing performance of the terminal sealing housing 3 and prevents the terminal sealing housing 3 from entering water. . The sealant poured into the filling and sealing chamber 2 15 can be a special sealant for SMG533 solar cell components or a silicone potting compound for solar cell components.

The U-shaped bottom end surface of the internal partition 16 and the internal bottom end surface provided with the window 10 on the outer shell 1 are arranged at intervals to form a bottom waterproof cavity 20, and the bottom waterproof cavity 20 is filled with heat-conducting silicone grease; The U-shaped bottom end surface of the internal partition 16 is provided with a number of heat dissipation through holes, and the U-shaped bottom end surface of the internal partition 16 is pasted with cooling fins 21, and the cooling fins 21 and the outer surface of the internal partition 16 are glued and fixed. .

In this application, the heat emitted by the terminal sealing shell 3 is transferred to the internal partition 16 , and then transferred to the bottom waterproof cavity 20 through the through hole on the U-shaped bottom end surface of the internal partition 16 . The thermal conductive silicone grease is poured into the bottom waterproof cavity 20 to facilitate heat transfer to the bottom waterproof cavity 20 and the heat transfer to the heat dissipation metal plate 11 . In addition, the heat-conducting silicone grease has good waterproof sealing performance, which can prevent water from entering the gap between the heat-dissipating metal plate 11 and the outer casing 1 from entering the outer casing 1 . The heat sink 21 covers and fits the through hole on the bottom end surface of the 16U-shaped internal partition to prevent the water leaking through the bottom waterproof cavity 20 from leaking to the terminal seal through the through hole on the bottom end surface of the 16U-shaped internal partition shell3.

The heat dissipation metal plate 11 is attached to the inner bottom end surface of the outer shell 1 and fixed by bolts. The heat dissipation metal plate 11 is provided with an annular groove 22, and the annular groove 22 surrounds the inner bottom end surface of the outer shell 1. The window 10 is provided, and the opening of the groove 22 faces the inner bottom end surface of the outer casing 1 and is filled with sealant.

In this application, the groove 22 on the heat dissipation metal plate 11 is filled with sealant, which can prevent water from entering the outer casing 1 from the gap between the heat dissipation metal plate 11 and the outer casing 1, and improve the overall photovoltaic connection. The tightness of the box.

The internal partition board 16, the internal partition board 12 and the slideway are integrally formed.

In the present application, the internal partition 16 , the internal partition 12 , and the slideway are integrated, which improves the overall strength of the internal partition 16 and improves the service life.

The outer cover plate 2 is provided with a plurality of fixed screw rods 23, and the fixed screw rods 23 pass through the outer cover plate 2, the inner partition plate 12, the heat dissipation metal plate 11, and the inner bottom end surface of the outer shell 1 and are fixed by threads; Part of the partition 12 is provided with a number of grouting holes, the outer cover 2 is attached to the surface of the inner partition 12 facing the outer cover 2, and the surface of the inner partition 12 facing the outer cover 2 is coated with sealant.

In this application, the outer cover plate 2 and the heat dissipation metal plate 11 are fixed on the outer casing 1 by the fixing screw 23, and the U-shaped opening end of the inner partition plate 16 is attached to the outer cover plate 2, so that the inner partition plate 16 fixed in the outer casing 1. The sealant coated on the surface of the inner partition 12 facing the outer cover 2 improves the waterproof sealing between the outer cover 2 and the inner partition 12 .

A current detection module 24 is arranged between two adjacent terminal sealing shells 3, and the current detection module 24 is fixed on the slideway. The output end of the module 24 passes through the bottom end surface of the terminal sealing shell 3 and the heat dissipation metal plate 11 , and the output end of the current detection module 24 passes through the perforation of the heat dissipation metal plate 11 and is sealed with glue.

In this application, the current detection module 24 detects the current at both ends of the diode 9. If the diode 9 is broken down, the current detection module 24 transmits the current signal to the control terminal, so that the control terminal can remotely obtain the working conditions of the photovoltaic junction box.

Of course, the above description is not a limitation to the present invention, and the present invention is not limited to the above-mentioned examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention shall belong to protection scope of the present invention.

Claims (8)

1. A photovoltaic junction box, characterized in that: the device comprises an outer shell (1) with an opening at the upper end, wherein an opening of the outer shell (1) is covered with an outer cover plate (2); a plurality of terminal sealing shells (3) with upper openings are arranged in the outer shell (1), the terminal sealing shells (3) are arranged at intervals, an inner cover plate (4) is covered on the opening of the terminal sealing shells (3), and the terminal sealing shells (3) and the outer shell (1) are fixedly arranged relatively; a plurality of wire inlet ends (5) with openings at two ends are respectively arranged on two opposite side surfaces of the outer shell (1), and a plurality of wire inlet through holes (6) are respectively arranged on two opposite side surfaces of the terminal sealing shell (3); the terminal sealing shell (3) is internally provided with a conducting strip (7), the conducting strip (7) is fixedly arranged in the terminal sealing shell (3), and two ends of the conducting strip (7) are respectively provided with a U-shaped fixing line clip (8); a diode (9) is arranged between the conducting strips (7) in the two adjacent terminal sealing shells (3), and the terminals at two ends of the diode (9) penetrate through the side wall of the terminal sealing shells (3) and are electrically connected with the conducting strips (7); insulating heat-conducting glue is filled in the wiring terminal sealing shell (3), heat-conducting silicone grease is filled between the wiring terminal sealing shell (3) and the outer shell (1), a window (10) penetrating through the surface of the outer shell (1) is arranged on the surface, opposite to the outer cover plate (2), of the outer shell (1), a heat-radiating metal plate (11) is covered on the window (10), and the inner cover plate (4) is a metal cover plate; the U-shaped inner partition board (16) is arranged in the outer shell (1), and the wiring terminal sealing shell (3) is fixedly arranged in the inner partition board (16); a plurality of sliding ways are arranged on the U-shaped bottom end surface of the inner partition plate (16), a plurality of fins (18) are respectively arranged on two sides of the wiring end sealing shell (3), nuts are arranged in the sliding ways, fastening bolts (19) are arranged on the fins (18), and the fastening bolts (19) penetrate through the fins (18) and are in threaded connection with the nuts in the sliding ways; and a plurality of through holes matched with the wire inlet ends (5) are respectively arranged on the two U-shaped side surfaces of the inner partition plate (16).

2. The photovoltaic junction box of claim 1, wherein: two inner surfaces of the outer shell (1) provided with the wire inlet ends (5) are respectively provided with an inner partition plate (12), the inner partition plates (12) are provided with pouring sealing cavities (13) which are arranged along the length extending direction of the inner partition plates (12), the openings of the pouring sealing cavities (13) face the inner surfaces of the outer shell (1) provided with the wire inlet ends (5), the surfaces of the inner partition plates (12) provided with the pouring sealing cavities (13) are attached and fixed with the inner walls of the outer shell (1), the end parts of the two ends of the inner partition plates (12) are attached and fixed with the inner walls of the outer shell (1), and the outer shell (1) and the inner partition plates (12) are integrally formed; the filling sealing cavity (13) is filled with sealing glue, and the inner partition plate (12) is provided with a through hole matched with the wire inlet end (5); the inner partition plates (12) are provided with step bulges (17), the lower end faces of the inner partition plates (16) are attached to the step bulges (17), and two U-shaped side surfaces of the inner partition plates (16) are attached to the surfaces, provided with through holes, of the two inner partition plates (12) respectively.

3. The photovoltaic junction box of claim 1, wherein: two inner partition plates II (14) are arranged in the wiring terminal sealing shell (3), the inner partition plates II (14) are L-shaped bending plates, the two inner partition plates II (14) are respectively arranged on two inner surfaces of the wiring terminal sealing shell (3) and provided with a wire inlet through hole (6), one L-shaped bending end of the inner partition plates II (14) is fixed with the inner surface of the wiring terminal sealing shell (3) and provided with the wire inlet through hole (6), the other L-shaped bending end of the inner partition plates II (14) is fixed with the inner bottom end surface of the wiring terminal sealing shell (3), the other two end parts of the inner partition plates II (14) are fixed with the inner wall of the wiring terminal sealing shell (3), and a pouring sealing cavity II (15) is formed between the inner partition plates II (14) and the inner wall of the wiring terminal sealing shell (3); and the second filling sealing cavity (15) is filled with sealing glue, and the second inner partition plate (14) is provided with a through hole matched with the inlet wire through hole (6).

4. The photovoltaic junction box of claim 1, wherein: the U-shaped bottom end surface of the inner partition plate (16) and the inner bottom end surface of the outer shell (1) provided with the open window (10) are arranged at intervals to form a bottom waterproof cavity (20), and heat-conducting silicone grease is poured into the bottom waterproof cavity (20); the U-shaped bottom end face of the inner partition plate (16) is provided with a plurality of heat dissipation through holes, the U-shaped bottom end face of the inner partition plate (16) is attached with radiating fins (21), and the radiating fins (21) are fixed with the outer surface of the inner partition plate (16) in an adhesive mode.

5. The photovoltaic junction box of claim 4, wherein: the heat dissipation metal plate (11) is attached to the inner bottom end face of the outer shell (1) and is fixed through bolts, an annular groove (22) is formed in the heat dissipation metal plate (11), the annular groove (22) is arranged around a window (10) in the inner bottom end face of the outer shell (1), and an opening of the groove (22) faces the inner bottom end face of the outer shell (1) and is filled with sealant.

6. The photovoltaic junction box of claim 2, wherein: the inner partition plate (16), the inner partition plate (12) and the slide way are integrally formed.

7. The photovoltaic junction box of claim 2, wherein: a plurality of fixing screws (23) are arranged on the outer cover plate (2), and the fixing screws (23) penetrate through the outer cover plate (2), the inner partition plate (12), the heat dissipation metal plate (11) and the inner bottom end surface of the outer shell (1) and are fixed through threads; the inner partition plate (12) is provided with a plurality of grouting holes, the outer cover plate (2) is attached to the surface, facing the outer cover plate (2), of the inner partition plate (12, and sealing glue is coated on the surface, facing the outer cover plate (2), of the inner partition plate (12).

8. The photovoltaic junction box of claim 2, wherein: a current detection module (24) is arranged between two adjacent wiring end sealing shells (3), the current detection module (24) is fixed on a slide way, two detection ends of the current detection module (24) are respectively electrically connected with two ends of a diode (9), an output end of the current detection module (24) penetrates through the bottom end face of the wiring end sealing shells (3) and the heat dissipation metal plate (11), and an output end of the current detection module (24) penetrates through a perforation of the heat dissipation metal plate (11) to be sealed by glue filling.