CN103701407A

CN103701407A - Small sealant filling photovoltaic junction box

Info

Publication number: CN103701407A
Application number: CN201310576482.0A
Authority: CN
Inventors: 彭祁军; 李艳群
Original assignee: ZHEJIANG XINHUI OPTOELECTRONIC CO Ltd
Current assignee: Zhejiang Zhengtai Xinhui Photovoltaic Co ltd
Priority date: 2013-11-16
Filing date: 2013-11-16
Publication date: 2014-04-02
Anticipated expiration: 2033-11-16
Also published as: CN103701407B

Abstract

The invention discloses a small sealant filling photovoltaic junction box. The small sealant filling photovoltaic junction box comprises a base and an upper cover which are buckled with each other; a bottom plate is mounted in the base; terminals are mounted on the bottom plate; diodes are mounted on the terminals; photovoltaic cables pass through wire fasteners in the base and are connected with the terminals; the upper part of the bottom plate in the base is filled with sealant. The hottest part of the photovoltaic junction box is not in direct contact with a solar rear panel, a convection cavity is formed in the bottom of the base, a height difference exits between the bottom surface of the base and the bottom plate, and vent holes are formed in the upper cover, so that a good radiating effect is achieved; the inner cavity of a box body is filled with metal parts, the radiating area of the photovoltaic junction box filled with the sealant is large, and the heat distribution is uniform; the periphery of the base is bent to form coamings, and cavities are defined by the coamings, so that the radiating speed is increased while the sealant filling amount is reduced.

Description

Small-sized encapsulating type photovoltaic junction box

Technical field

The present invention relates to field of photovoltaic power generation, relate in particular to a kind of small-sized encapsulating type photovoltaic junction box being applied in photovoltaic generating system.

Background technology

In the electric connection technology of photovoltaic generating system, conventionally adopt photovoltaic junction box to realize the electrical connection between photovoltaic module and inverter.Due to the application scenario of photovoltaic junction box outdoor environment normally, therefore prevent that the media such as rainwater from infiltrating and affect the Consideration that inner electrical connection is an outbalance in photovoltaic junction box design.Encapsulating type photovoltaic junction box is realized water-tight by encapsulating, is solution preferably at present.Current encapsulating type photovoltaic junction box is identical with common terminal box, is all that installation cavity is set between box body, and diode is arranged in installation cavity.Because diode can produce higher temperature when working, along with the continuous rising of diode temperature, the resistance in diode will constantly increase, and cause diode to produce more heat, thereby waste more electric power resource, enter vicious circle.In order to guarantee that photovoltaic junction box has better thermal diffusivity, the general method that increases installation cavity volume in photovoltaic junction box that adopts, thereby increased thickness and the volume of whole photovoltaic junction box, the more important thing is, adopted and be difficult in this way the radiating effect that reaches good.Therefore, how dwindling as far as possible under the prerequisite of photovoltaic junction box volume, be implemented to sealing effectiveness, make encapsulating type photovoltaic junction box there is good heat dissipation ventilation effect simultaneously, become the focus of industry research.

Summary of the invention

The object of the present invention is to provide a kind of small-sized encapsulating type photovoltaic junction box with high heat dispersion and sealing property; by integral heat sink characteristics design and mounting structure, design; dwindling as far as possible under the prerequisite of photovoltaic junction box volume; realize encapsulating type photovoltaic junction box cross-ventilation, flash heat transfer; reach internal heat balance and protect diode, making product there is higher reliability.

Technical scheme of the present invention is as follows:

A small-sized encapsulating type photovoltaic junction box, comprises the base and the upper cover that mutually cover, in described base, base plate is installed, and a plurality of terminals are installed on described base plate, between each terminal, diode is installed; Photovoltaic cable is connected with terminal through the Line pressing buckle being arranged in base; In described base, in base plate top, fill and have fluid sealant;

Described terminal, base plate are distributed in base; Described terminal, base plate adopt heat proof material, and described base adopts nonrefractory material; After described base plate is assemblied in base, the bottom surface of base plate on different horizontal planes, has convection cavity on the base end face of described base plate below from the bottom surface of base; On described base plate, the bottom surface of mounting terminal is not provided with through hole, and described via bottoms is sealed by pasting boards;

It is crooked along base plate shape and perpendicular to the coaming plate of base end face that described base periphery is provided with; On described base, there are a plurality of cavitys that surrounded by coaming plate; Described upper cover top surface has projection upwards, and the end face of described upper cover or side have the ventilation hole corresponding with empty cavity position on base.

Its further technical scheme is: the pin of described diode is welded on two adjacent terminals, and described terminal is installed on base plate, and described base plate is installed on base.

Useful technique effect of the present invention is:

The present invention is on hot speciality is optimized, make direct contact solar backboard of hot spot, in the base bottom at place, hot spot, offer the convection cavity of hollow out, and it is poor to make base end face and base plate directly form shoulder height, by above covering the ventilation hole of processing, heat is dispersed fast simultaneously, played the effect of radiating and cooling; By metalwork being covered with to box body inner chamber, make the area of dissipation after encapsulating larger, the heat in box body is more evenly distributed; By base periphery is bent to form to coaming plate, and form a plurality of cavitys by coaming plate, when having reduced encapsulating amount, make again heat radiation accelerate; By the design of upper cover surface convex, effectively increased photovoltaic junction box inner space, be also conducive to the raising of heat dispersion.

Advantage of the present invention will provide in embodiment description partly below, and part will become obviously from the following description, or recognize by practice of the present invention.

Accompanying drawing explanation

Fig. 1 is exploded view of the present invention.

Fig. 2 is superstructure figure of the present invention.

Fig. 3 is base arrangement figure of the present invention.

Fig. 4 is understructure figure of the present invention.

Fig. 5 is cut-away view of the present invention.

Fig. 6 is structure figure of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.

As shown in Figure 1, the present invention includes the base 5 and the upper cover 1 that mutually cover, base plate 4 is installed in base 5, difform a plurality of terminal 3 and a plurality of diode 2 are installed on base plate 4.See Fig. 5, mounting means is that diode 2 is installed between terminals of adjacent 3.As shown in Figure 1, two Line pressing buckles 6 are arranged in base 5, and two strands of photovoltaic cables 7 weld through Line pressing buckle 6 and with terminal 3 respectively.

As shown in Figure 5, two pins of diode 2 are welded on two adjacent terminals 3, and terminal 3 is installed on base plate 4, and base plate 4 is installed to again on base 5.

Because the present invention is encapsulating type, therefore in base 5, in the space above base plate 4, be all perfused with fluid sealant.See Fig. 3, Fig. 6, on base plate 4, the bottom surface of mounting terminal 3 is not provided with through hole 4-1, pasting boards (not shown) sealing for through hole 4-1 bottom, so fluid sealant can not flow in the space of through hole 4-1 below.

As shown in Figure 6, when base plate 4 be assemblied in base 5 interior after, the bottom surface of base plate 4 on different horizontal planes, has convection cavity 5-1 on base 5 bottom surfaces of base plate 4 belows from the bottom surface of base 5.Wherein, terminal 3, base plate 4 adopt heat proof material, for example metal; Base 5 adopts nonrefractory material.Such structure, make base 5 bottoms and base plate 4 height of formations of photovoltaic junction box poor, the most serious terminal 3 of box body internal heat generation, base plate 4 positions are direct contact solar backboard not, avoided the heat on terminal 3, base plate 4 to be transmitted to fast on base 5, thus the solar panel of impact below.

Again as shown in Figure 5, metalwork terminal 3, base plate 4 are distributed in base 5, have covered more than at least 90% base area of base 5 inner chambers, have substantially been covered with box body inner chamber, and the area of dissipation after encapsulating is larger like this, and the heat in box body is more evenly distributed.

As shown in Figure 4, it is crooked along base plate 4 shapes and perpendicular to the coaming plate 5-2 of base 5 bottom surfaces that base 5 peripheries are provided with, and coaming plate 5-2 is the encirclement to fluid sealant during for encapsulating.On base 5, also have by coaming plate 5-2 and connect rear formed a plurality of cavity 5-3, the position of cavity 5-3, without encapsulating, has reduced encapsulating amount, has saved cost, and cavity 5-3 can make again heat radiation faster simultaneously, kills two birds with one stone.

As shown in Figure 2, upper cover 1 end face has protruding 1-1 upwards, has effectively increased box body inner space, is also conducive to the raising of heat dispersion; Meanwhile, the end face of upper cover 1 and side have the ventilation hole 1-2 corresponding with cavity 5-3 position on base 5; In embodiment, the end face of upper cover 1 middle part has a ventilation hole 1-2 corresponding with middle cavity 5-3 position on base 5, and the side of upper cover 1 has two the ventilation hole 1-2s corresponding with cavity 5-3 position, both sides on base 5.This structure can form the inside and outside cross-ventilation of box body, plays the effect of radiating and cooling.

Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate without departing from the spirit and concept in the present invention, within all should thinking and being included in protection scope of the present invention.

Claims

1. a small-sized encapsulating type photovoltaic junction box, comprise the base (5) and the upper cover (1) that mutually cover, base plate (4) is installed in described base (5), a plurality of terminals (3) are installed on described base plate (4), diode (2) is installed between each terminal (3); Photovoltaic cable (7) is connected with terminal (3) through the Line pressing buckle (6) being arranged in base (5); In described base (5), in base plate (4) top, fill and have fluid sealant;

It is characterized in that: described terminal (3), base plate (4) are distributed in base (5); Described terminal (3), base plate (4) adopt heat proof material, and described base (5) adopts nonrefractory material; After in described base plate (4) is assemblied in base (5), the bottom surface of base plate (4) on different horizontal planes, has convection cavity (5-1) on base (5) bottom surface of described base plate (4) below from the bottom surface of base (5); On described base plate (4), the bottom surface of mounting terminal (3) is not provided with through hole (4-1), and described through hole (4-1) bottom is sealed by pasting boards;

It is crooked along base plate (4) shape and perpendicular to the coaming plate (5-2) of base (5) bottom surface that described base (5) periphery is provided with; On described base (5), there are a plurality of cavitys (5-3) that surrounded by coaming plate (5-2); Described upper cover (1) end face has projection (1-1) upwards, and the end face of described upper cover (1) or side have the ventilation hole (1-2) corresponding with cavity (6-3) position on base (6).

2. small-sized encapsulating type photovoltaic junction box according to claim 1, it is characterized in that: the pin of described diode (2) is welded on adjacent two terminals (3), it is upper that described terminal (3) is installed to base plate (4), and described base plate (4) is installed on base (5).