CN101989737A

CN101989737A - Special junction box for solar module

Info

Publication number: CN101989737A
Application number: CN2009101654505A
Authority: CN
Inventors: 孔凡建
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-30
Filing date: 2009-07-30
Publication date: 2011-03-23

Abstract

The invention provides a special junction box for a solar module, which is used for electrical installation of the solar module and can ensure reliable operation of the solar module. The special junction box is characterized in that a fixed ring is added to the box for locking a connecting cable so as to really realize separation of mechanical connection and electrical connection; tables for installing diodes are arranged on the box and a box cover respectively so that the diodes can be directly contacted with the box and the box cover, which shortens the radiating path of the diodes and improves heat dissipation of the diodes; radiating fins are arranged on the box cover, which increases radiating area of the box cover; and steps are arranged at the bottom of the box and are used for limiting relative position between the junction box and a conductor at a lead-out terminal of the solar module so as to further limit installation location.

Description

The solar module special junction box

Affiliated technical field

The present invention is a kind of solar module special junction box, and the solar module reliably working is installed and guaranteed to the electrical equipment that is used for solar module.

Background technology

Solar module is with series connection or solar cell encapsulation and assembling in parallel, realizes having certain machinery and electric rock-steady structure, the energy photovoltaic device of being convenient to install and use.The electric power output of solar module needs to use the terminal box that can be connected with external circuit.Simultaneously, terminal box also should have the ability that solar module is worked under non-normal condition.

For the ability that guarantees that solar module is worked under non-normal condition, solar module special junction box inside is equipped with bypass diode.The effect of bypass diode is, when the one group solar cell in parallel with bypass diode in the solar module can't operate as normal, makes the electric current that flows through solar module can be through the bypass diode circulation.

Have on the bypass diode electric current by the time can generate heat, bad bypass diode even the terminal box integral body of may causing of dispelling the heat is burnt, so improve the key that the radiating condition of bypass diode is a design solar module special junction box.

It is generally acknowledged that increase the terminal box volume inside, being equivalent to has increased heat-dissipating space to bypass diode, more favourable to the heat radiation of diode.Therefore, no matter present terminal box is the terminal box of utilizing the sealing ring sealing, or the terminal box of whole sealant pouring and sealing, all tends to increase the volume of terminal box, cause the increase of material and processing cost, and reliability of products descends.

In fact, in local space inside, the transmittance process of heat is based on heat conduction, and the heat that bypass diode produces should be as soon as possible mainly be delivered on the outer surface of the lid of terminal box and box body in heat conducting mode, and the outer surface by lid and box body is delivered in the atmosphere again.That is to say that the path that the heat of solar module special junction box inside is transmitted is short as far as possible, this just requires the volume of terminal box as far as possible little, increases the area of dissipation of terminal box outer surface simultaneously.

According to the requirement of international standard IEC61730-1, " contact point of all electrical connections should be firmly, do not have mechanical stress ", being electrically connected with mechanical connection of terminal box should separate, and is exactly the effect that connecting structure for electrical equipment can not have mechanical connection.Existing terminal box uses the method for the outside plastic cement protective layer of locking cable line to realize mechanical connection.Because plastic cement is a flexible material, deformation can take place after stressed, such mechanical connection does not often reach desired intensity.

Summary of the invention

In order to improve the radiating condition of solar module special junction box internal body diodes, reduce the production cost of solar module special junction box, increase the mechanical connection intensity between terminal box inside cable and the box body, be convenient to install, the present invention has designed a kind of solar module special junction box, belongs to the solar module special junction box of sealant pouring and sealing type.

This solar module special junction box by box body 1. with lid 5., at least two binding posts that are connected with solar cell exit conductor 4., at least one diode that 4. binding post is together in series 2., two respectively be connected with a diode 2. an end the cable that 4. binding post is connected and realization is connected with external circuit 8., with two cables 8. be respectively fixed to two retainer rings that 1. box body go up 6. with a briquetting 7., 3. 4. the link terminal form with briquetting screw 7..

6. retainer ring locks with cable metal core 8., and 6. retainer ring is installed in the 1. inner stopper slot of box body then.

8. cable is connected to binding post rear end 4., and 2. diode is connected binding post front end both sides 4..

5. 1. box body all design the table top that diode is installed in inside with lid, can make be installed in box body 1. the diode in the body 2. 1. 5. directly closely contact with lid with box body, 5. 1. the heat that 2. diode is produced directly be transmitted to the terminal box outer surface with lid by box body.

Box body 1. in, 1. and the relative position between the solar cell exit conductor corresponding wiring terminal 4. bottom opening place of front position respectively stretches out a step a, is used to limit box body.

Box body 1. in, briquetting 7. and retainer ring have a gum-injecting port between 6., guarantee the fluid sealant that the injects slit of closed perimeter effectively.

Lid 5. external Design has radiating fin, increases area of dissipation.

The invention has the beneficial effects as follows: because 5. 1. 2. diode directly contact with lid with box body, shortened the path of hot transmission to greatest extent, improve diode heat radiation 2., also greatly reduced the volume of terminal box, saved the processing cost and the installation cost of terminal box; Owing to used retainer ring 6., make cable 8. and the mechanical connection intensity of box body between 1. strengthen; Because the location of wiring in the box installation process is convenient in the existence of step a.

Description of drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is the profile of Application Example 1 of the present invention along front view A-A and B-B.

Fig. 3 is the profile of Application Example 2 of the present invention along front view A-A and B-B.

Among the figure, 1. box body, 2. diode, 3. screw, 4. binding post, 5. lid, 6. retainer ring, 7. briquetting, 8. cable.

Embodiment

Fig. 1 is the embodiment that four binding posts and three diodes are arranged.

In Fig. 1,6. 8. two cables locked by two retainer rings respectively, is connected respectively to two binding post rear ends 4..6. retainer ring is inserted in the 1. inner stopper slot of box body, use screw 3. 7. 8. cable to be pressed on the terminal box by briquetting.2. a diode of the binding post that is connected with cable front end welding 4. is welded on another binding post front end 4. again.If two binding posts have only been installed in terminal box inside 4., just only need a diode 2. 4. two binding posts to be together in series; If three binding posts have been installed in terminal box inside 4., just need two diodes 2. 4. three binding posts to be linked up, and cable binding post 8. is installed 4. only 2. is connected, at two cable binding post 8. which in the middle of 4. is installed and cable binding post 8. is not installed is welded with two diodes 2. on 4. with a diode; If four binding posts have been installed in terminal box inside 4., just need three diodes 2. 4. four binding posts to be coupled to each other, cable binding post 8. is installed equally 4. only 2. is connected, be not welded with two diodes 2. on 4. and cable binding post 8. is installed with a diode; The rest may be inferred.Finally, be welded with diode binding post 2. rear end 4. and 8. be connected, lock this cable retainer ring 8. and 6. insert in another 1. inner stopper slot of box body with the cable that 6. another ring that is fixed locks.7. 8. this cable also be pressed on the terminal box by briquetting.

In Fig. 2,2. the diode of installation is cylindrical encapsulation; 2. diode is installed in binding post front end one side 4., is placed on 1. interior being specifically designed to of box body then and installs in the cylindrical encapsulation diode circular arc spill table top 2.; 5. inner at lid, corresponding box body is internal body diodes installation site 2. 1., design has to be specifically designed to installs cylindrical encapsulation diode circular arc spill table top 2., and 2. this circular arc spill table top can be pressed on the cylindrical encapsulation diode 1. interior being specifically designed to of box body and install in the cylindrical encapsulation diode circular arc spill table top 2..

In Fig. 2,5. outside at lid, design has radiating fin.

In the B-B of Fig. 2 profile, box body 1. the bottom corresponding wiring terminal 4. the opening part of front end respectively stretch out a step a.1. and the relative position between the solar cell exit conductor step a is used to limit box body, is convenient to determine the position of terminal box on solar module in the process that terminal box is installed; Box body 1. the bottom, corresponding briquetting 7. and retainer ring 6. between, a hole for injecting glue is arranged.

Fig. 3 is the profile of Application Example 2 of the present invention along front view A-A and B-B.In Fig. 3,2. the diode of installation is flat type encapsulation, and correspondingly each installation table top also is the planar shaped table top.Among the embodiment 2 all other, all identical with embodiment 1.

Claims

1. solar module special junction box, comprise the box body made by insulating material 1. with lid 5., have at least two be installed in the 1. inner binding post of box body 4., at least one diode that 4. binding post is together in series 2., two respectively be connected with a diode 2. an end the cable that 4. binding post is connected and realization is connected with external circuit 8., with two cables 8. be respectively fixed to two retainer rings that 1. box body go up 6. with a briquetting 7., 3. 4. the link terminal form with briquetting screw 7..8. and be fixed in the box body location notch 1. it is characterized in that: 6. retainer ring pins cable.

2. solar module special junction box according to claim 1 is characterized in that: 2. diode is connected binding post front end 4..

3. solar module special junction box according to claim 1 is characterized in that: 1. goes up at box body, and on the position that diode is installed, the table top that has a suitable diode to install; The corresponding wiring terminal 4. front and back, bottom opening place of front position respectively stretches out a step a; Briquetting 7. and retainer ring have a gum-injecting port between 6..

4. solar module special junction box according to claim 1 is characterized in that: lid 5. indoor design has table top, is pressed in to be installed in the diode of box body in 1. and 2. to go up; Lid 5. external Design has radiating fin.