CN215268183U

CN215268183U - Large-current photovoltaic junction box

Info

Publication number: CN215268183U
Application number: CN202121116511.1U
Authority: CN
Inventors: 彭祁军; 郑朋朋; 李艳群; 叶杰; 朱于静
Original assignee: Zhejiang Xinhui Photovoltaic Technology Co ltd
Current assignee: Zhejiang Zhengtai Xinhui Photovoltaic Co ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-12-21
Anticipated expiration: 2031-05-24

Abstract

The utility model discloses a heavy current photovoltaic terminal box belongs to photovoltaic terminal box structural design field. The utility model discloses a heavy current photovoltaic terminal box, the bottom of its base is bonding area and ventilation zone, and the ventilation zone has increased the air inflow, forms the circulation of air, improves the radiating effect of terminal box, realizes the purpose of quick heat dissipation cooling, effectively reduces the influence of terminal box self heat to battery piece power decay, increases the generated energy under equal irradiance and ambient temperature's condition. And the volume of the box body does not need to be increased, the heat dissipation capability is improved, and the cost is saved. The bus bar sequentially penetrates through the holes of the back plate or the glass and the bonding area and is finally electrically connected to the terminal plate, the back plate or the glass of the ventilation area improves the capacity of the bus bar for absorbing and emitting diode heat, and the base part at the ventilation area is added with a heat radiation surface of the junction box and also improves the heat radiation capacity. The bonding area is processed into a hole or a small groove, and the bonding glue is extruded into the junction box through the hole or the small groove to be solidified to form an inverted buckle, so that the bonding capacity is improved.

Description

Large-current photovoltaic junction box

Technical Field

The utility model belongs to the structural design field of photovoltaic terminal box, concretely relates to heavy current photovoltaic terminal box.

Background

The photovoltaic junction box is a circuit path connecting the photovoltaic cell and the system. The current universal junction box is a flat or rectangular box which is made of engineering plastics through die casting, and the bottom of the box is smooth and clean. The installation method is that the bottom of the junction box is coated with solar silica gel, then the junction box is installed in the middle position of the assembly backboard or the glass close to the upper frame, and the junction box and the assembly backboard or the glass are firmly bonded together after the silica gel is solidified. At present, all the junction boxes of the crystalline silicon components in China and abroad have basically the same structure and installation mode.

The diodes in the junction box generate heat whether in bypass operation or reverse off state. Particularly, as the output current of the high-efficiency module is larger, the heat generated when the diode in the junction box works is also larger and larger. When the heat generated by the diode is larger than the cooling capacity of the junction box, the diode is broken down due to temperature rise and leakage current. When the diode works in a high-temperature environment, the current passing capability is reduced like the automatic load reduction after the inverter is heated. Current and temperature are important factors affecting the long-term reliable operation of the diode. Only when the photovoltaic junction box works reliably for a long time, the system can generate power stably and reliably.

The heat dissipation capability of the junction box mainly depends on the structural design of the box body. Particularly, the high-efficiency assembly has high current and generates heat more seriously, so that the heat dissipation of the junction box is more important to ensure the current passing capacity of the diode at high temperature and the long-term reliability of the diode. Meanwhile, the junction box with the good heat dissipation structure can reduce the volume of the junction box on the premise of ensuring the quality, and the cost of the junction box is reduced. Therefore, it is a target to be achieved in the structural design of the current photovoltaic junction box to improve the heat dissipation capability of the junction box, and thus the current passing capability of the diode.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a heavy current photovoltaic terminal box to solve the problem that the present photovoltaic terminal box that proposes exists in the above-mentioned background art, the purpose improves the heat-sinking capability of photovoltaic terminal box, improves the through current ability of silica-based diode in the photovoltaic terminal box, realizes the long-term reliable work of photovoltaic terminal box, and the system is reliable and stable generates electricity.

The technical scheme of the utility model as follows:

a high-current photovoltaic junction box comprises a base, wherein a diode and a terminal plate electrically connected through the diode are installed in the base, and pouring sealant is filled in the base to cover the diode; the bottom of the base comprises an adhesion area and a ventilation area, the adhesion area is positioned below the diode and in the middle of the bottom, and the ventilation area is positioned on two sides of the adhesion area; bosses are arranged around the bottom of the bonding area, the bonding area and the ventilation area are positioned on different planes through the bosses, and the height of the bonding area is higher than that of the ventilation area; the ventilating area is provided with support legs or auxiliary bonding areas, and the height of the support legs or the auxiliary bonding areas is consistent with that of the bosses; when the base is mounted on the assembly backplane or glass, the bosses of the adhesive zone and the feet or auxiliary adhesive zones of the vent zone are in contact with the backplane or glass.

Further, the bonding area is bonded with the back plate or the glass through bonding glue; the ventilating area is not in contact with the back plate or the glass, and an air channel is formed between the ventilating area and the back plate or the glass.

Furthermore, a first bus bar guide through hole is arranged in the middle of the bonding area, and a second bus bar guide through hole is arranged on the terminal piece; the bus bar is positioned below the back plate or the glass, penetrates through the ventilation area to enter the bonding area, bends to penetrate through a hole of the back plate or the glass, a first bus bar guide through hole of the bonding area and a second bus bar guide through hole on the terminal piece, and is finally bent to be electrically connected on the terminal piece.

Furthermore, a trapezoidal guide block is arranged in the base, is positioned below the diode and is positioned in the middle of the first bus bar guide through hole.

Furthermore, the front surface of the terminal piece is provided with a tin block, and two sides of the tin block are respectively provided with a second bus bar guide through hole and a tin blocking strip.

Furthermore, a hole or a small groove is formed in the bottom plate of the bonding area, and the bonding glue is squeezed into the junction box through the hole or the small groove to be solidified to form an inverted buckle.

Furthermore, one end of the base is provided with a wire pressing buckle, the wire pressing buckle is matched with the base in a wedge shape, and the cable penetrates through the middle of the base and the wire pressing buckle and then is connected with the terminal piece.

Furthermore, the base is filled with pouring sealant to cover the diode, a hollow bulge is arranged on the part of the base above the wire pressing buckle, and the height of the bulge is higher than that of the pouring sealant after the diode is covered by the pouring sealant.

The utility model has the beneficial technical effects that:

the utility model discloses a heavy current photovoltaic terminal box, the bottom of its base is bonding area and ventilation zone, and the ventilation zone is located the both sides of bonding area, and the ventilation zone has increased the air inflow, forms the circulation of air, has improved the whole radiating effect of terminal box, and the temperature rise of terminal box reduces than current structure. The ventilation zone has increased the cooling surface of terminal box, realizes the purpose of quick heat dissipation cooling, can fine play the radiating effect to backplate or glass, and ventilation zone space occupation bottom area more than half can effectively reduce the influence of terminal box self heat to battery piece power decay, increases the generated energy under equal irradiance and ambient temperature's condition. The structural design does not need to increase the volume of the box body, improves the heat dissipation capacity and saves the cost. Meanwhile, the bus bars arranged in the assembly sequentially penetrate through the holes and the bonding areas of the back plate or the glass and are finally electrically connected to the terminal pieces, the back plate or the glass of the ventilation area improves the capacity of the bus bars for absorbing and emitting diode heat, and the base part at the ventilation area is added with a heat radiation surface of the junction box and also improves the heat radiation capacity. The bonding area is processed into a hole or a small groove, and the bonding glue is extruded into the junction box through the hole or the small groove to be solidified to form an inverted buckle, so that the bonding capacity is improved. Furthermore, the utility model discloses the great problem of the corresponding hole degree of difficulty of aiming at when still having solved the area installation that converges to and the problem of soldering tin high temperature state melting outflow has been solved.

Advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is the front structure view of the high current photovoltaic junction box of the present invention.

Fig. 2 is the back structure view of the high current photovoltaic junction box of the present invention.

Fig. 3 is the side structure view of the high current photovoltaic junction box of the present invention.

Fig. 4 is a cross-sectional view of the high current photovoltaic junction box of the present invention installed on a back plate or glass.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a structural view of the terminal piece of the present invention.

Figure 7.1 is a block diagram of another embodiment of a fastener adhesive area.

Fig. 7.2 is a partial enlarged view of fig. 7.1.

Fig. 7.3 is a cross-sectional view a-a of fig. 7.1.

Fig. 7.4 is a structural view of the fitting of the wire clip and the base in fig. 7.1.

In the figure: 1-a base, 2-a terminal plate, 3-a diode, 4-a bus bar, 5-a cable, 6-a wire pressing buckle, 7-a back plate or glass, 8-a bonding area, 9-a ventilation area, 10-a lug boss, 11-a support leg, 12-a first bus bar guide through hole, 13-a second bus bar guide through hole, 14-a trapezoidal guide block, 15-a tin block, 16-a tin blocking strip, 17-a hole or a small groove, and 18-a wire pressing buckle bonding area.

Detailed Description

The following describes the embodiments of the present invention with reference to the accompanying drawings.

In the structural design of the photovoltaic junction box, the junction box comprises a single junction box and a split junction box. The present embodiment is described by taking a split junction box as an example.

The split junction box is formed by decomposing a junction box into a positive junction box, a negative junction box and a plurality of intermediate junction boxes. The split junction box can enable the connection length to be minimum, the heat of the diode is dispersed, meanwhile, the electric parts in the middle junction box can be sealed well in advance, and only the positive junction box and the negative junction box need to be sealed during field installation, so that the field workload is reduced, and the wiring reliability is improved. The structure design of the utility model is also suitable for a single junction box, a bipartite junction box or a junction box with more split bodies.

Because the utility model discloses in, the mounting structure of subassembly is the same basically in anodal box body, negative pole box body and the middle box body. One of the cases, such as a positive terminal box or a negative terminal box, will be described as an example.

Referring to fig. 1, the utility model discloses a junction box includes base 1, installs the diode 3 of horizontal setting in the base 1 to and through diode 3 electric connection's terminal piece 2, two converge take 4 from base 1 bottom penetrate its tip of back and buckle and weld respectively on terminal piece 2. One end of the junction box is provided with a wire pressing buckle 6, and the leading-out end of the cable 5 penetrates through the middle of the base 1 and the wire pressing buckle 6 and then is welded with the terminal piece 2. Of course, if the junction box is an intermediate combination, the above-described cable 5 and the wire-crimping buckle 6 are not included.

Referring to fig. 2, the bottom portion of the base 1 is an adhesive area 8 and a ventilation area 9, wherein the adhesive area 8 is located below the diodes 3 at the bottom middle position, and the ventilation area 9 is located at both sides of the adhesive area 8. Referring to fig. 2 and 3, a circle of bosses 10 are arranged around the bottom of the bonding area 8, the bosses 10 have a certain height, so that the bonding area 8 and the ventilation area 9 are located on different planes, and the height of the bonding area 8 is higher than that of the ventilation area 9. The edge of the ventilation zone 9 is provided with a plurality of support legs 11, and the height of the support legs 11 is consistent with that of the boss 10. When the base 1 is mounted on the assembly backplane or glass 7, the bosses 10 of the adhesive area 8 and the legs 11 of the venting area 9 contact the backplane or glass 7, which may stabilize the base 1 when mounted on the assembly backplane or glass 7.

Referring to fig. 2, cover diode 3 behind the intussuseption casting glue of base 1, bonding area 8 bonds through bonding glue and backplate or glass 7, and the heat of diode 3 and the heat of terminal piece 2 can be conducted fast on backplate or glass 7 through casting glue and bonding area 8, dispels the heat. Referring to fig. 3, the ventilation area 9 is not in contact with the back plate or the glass 7, an air channel is formed between the ventilation area 9 and the back plate or the glass 7, air flows into the space between the base 1 and the back plate or the glass 7 to form air circulation, the heat dissipation surface of the junction box is increased in the ventilation area 9, a heat dissipation effect on the back plate or the glass can be achieved, the purpose of rapid heat dissipation and cooling is achieved, the influence of the heat of the junction box on the power attenuation of the battery piece is effectively reduced, and the power generation capacity is increased. And the volume of the box body does not need to be increased, the heat dissipation capability is improved, and the cost is saved.

Referring to fig. 1 and 2, bonding area 8 intermediate position is equipped with first area direction through-hole 12 that converges, is equipped with the second on the terminal piece 2 and converges and takes direction through-hole 13, and first area direction through-hole 12 that converges and the effect of second area direction through-hole 13 that converges leads when installing the area that converges, conveniently converges the installation of area in narrow and small space.

Referring to fig. 4 and 5, the bus bar 4 in this embodiment is a double-sided assembly bus bar, and when being installed, two bus bars 4 are located under the back plate or glass 7, pass through the ventilation area 9, enter the bonding area 8, and are bent to pass through a hole of the back plate or glass 7, a first bus bar guide through hole 12 of the bonding area 8, a second bus bar guide through hole 13 on the terminal plate 2, and finally are bent to be electrically connected to the terminal plate 2. The back plate or glass 7 of the ventilation zone 9 improves the ability of the bus bar 4 to absorb heat of the diodes 3 and dissipate the heat; the base portion at the ventilation zone 9 increases the heat dissipating surface of the junction box and also improves the heat dissipating capacity.

Referring to fig. 5, a trapezoidal guide block 14 is disposed in the base 1, and the trapezoidal guide block 14 is located below the diode 3 and in the middle of the first bus bar guide through hole 12. The small end of the trapezoidal guide block 14 faces the first bus bar guide through hole 12 side, and the large end faces the diode 3 side. The effect of this structure is that, when the bus bar 4 is mounted, the trapezoidal guide ribs 14 enable the bus bar 4 to be easily introduced into the first bus bar guide through-hole 12 and then inserted into the second bus bar guide through-hole 13. The small end of the trapezoid guide block 14 faces one side of the first bus bar guide through hole 12, so that the hole for inserting the bus bar 4 is large, the bus bar 4 can be easily inserted, the inclined planes on the two sides of the trapezoid guide block 14 can guide the advancing direction of the inserted bus bar 4, the tail end of the inclined plane of the trapezoid guide block 14 is just aligned to the position of the second bus bar guide through hole 13 on the terminal piece 2, the bus bar 4 can be accurately inserted into the second bus bar guide through hole 13, and the problem that the difficulty of aligning corresponding holes in the installation of the bus bar is large is solved.

Referring to fig. 6, the terminal plate 2 includes two terminal plate segments, the diode 3 is mounted between the two terminal plate segments, and the two terminal plate segments are electrically connected by the pins of the diode 3. The front surfaces of the two terminal piece separating sheets are respectively provided with a tin block 15, the two second bus bar guiding through holes 13 are respectively arranged on the inner sides of the two tin blocks 15, and the two tin blocking strips 16 are respectively arranged on the outer sides of the two tin blocks 15. Two-sided subassembly converge and take 4 to pass the second and converge and take 90 degrees after the guide through-hole 13 and buckle, weld respectively on two tinsels 15. The function of the structure is that the tin block 15 is reserved on the terminal piece 2 for convenient welding, so that additional tin soldering is not needed during welding; the tin blocking strips 16 are used for limiting the soldering tin in a molten state, and the tin block 15 easily flows everywhere after being molten in a high-temperature state, so that the tin blocking strips 16 are arranged to prevent the soldering tin in the molten state from flowing out of the terminal piece 2 and flowing into the junction box, and the problem of the outflow of the soldering tin is solved.

Referring to fig. 2, since the bottom of the base 1 is bonded to the back plate or the glass 7 only through the bonding area 8, the bonding area becomes smaller than that of the prior art, and the connection strength is lowered. In order to solve the problem, a hole or a small groove 17 is processed on a base bottom plate between a boss 10 of a bonding area 8 below the diode 3 and a first confluence belt guide through hole 12, after bonding glue is coated between the bonding area 8 and a back plate or glass 7, the bonding glue is extruded into a junction box through the hole or the small groove 17 to be solidified to form an inverted buckle, and bonding capacity is improved. On the other hand, the holes or the small grooves increase the heat dissipation area, the heat of the diodes and the terminal blocks can be quickly conducted to the photovoltaic module back plate or the glass through the pouring sealant for heat dissipation, and the heat dissipation capacity of the box body is improved.

Referring to fig. 7.1 to 7.4, in another embodiment, a wire-pressing buckle bonding area 18 may be further disposed below the wire-pressing buckle 6, the wire-pressing buckle bonding area 18 is coated with a bonding glue to be bonded with the back plate or the glass 7, the wire-pressing buckle bonding area 18 and the bonding area 8 in the middle of the junction box are connected with the back plate or the glass 7 together, and the two mounting areas are beneficial to reinforcement and mounting, so as to improve mounting stability. In addition, as can be seen from fig. 7, the wire pressing buckle 6 is matched with the base 1 in a wedge shape, and the sealing performance is better. Moreover, as seen in fig. 1 and 3, the base 1 has a hollow protrusion above the wire-crimping buckle 6, that is, the position of "+" in fig. 1, the height of the protrusion is higher than the height of the potting adhesive after the potting adhesive covers the diode, because the space of the protrusion is relatively large, the potting adhesive can easily enter the protrusion during potting, so that the air exhaust of the potting adhesive is realized, the air in the protrusion is exhausted after the potting adhesive is filled, the potting adhesive is relatively full, and the gap is not existed in some junction boxes after potting.

What has been described above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.

Claims

1. A high-current photovoltaic junction box comprises a base, wherein a diode and a terminal plate electrically connected through the diode are installed in the base, and pouring sealant is filled in the base to cover the diode; the method is characterized in that: the bottom of the base comprises an adhesion area and a ventilation area, the adhesion area is positioned below the diode and in the middle of the bottom, and the ventilation area is positioned on two sides of the adhesion area; bosses are arranged around the bottom of the bonding area, the bonding area and the ventilation area are positioned on different planes through the bosses, and the height of the bonding area is higher than that of the ventilation area; the ventilating area is provided with support legs or auxiliary bonding areas, and the height of the support legs or the auxiliary bonding areas is consistent with that of the bosses; when the base is mounted on the assembly backplane or glass, the bosses of the adhesive zone and the feet or auxiliary adhesive zones of the vent zone are in contact with the backplane or glass.

2. A high current photovoltaic junction box according to claim 1, wherein: the bonding area is bonded with the back plate or the glass through bonding glue; the ventilating area is not in contact with the back plate or the glass, and an air channel is formed between the ventilating area and the back plate or the glass.

3. A high current photovoltaic junction box according to claim 1, wherein: a first bus bar guide through hole is formed in the middle of the bonding area, and a second bus bar guide through hole is formed in the terminal piece; the bus bar is positioned below the back plate or the glass, penetrates through the ventilation area to enter the bonding area, bends to penetrate through a hole of the back plate or the glass, a first bus bar guide through hole of the bonding area and a second bus bar guide through hole on the terminal piece, and is finally bent to be electrically connected on the terminal piece.

4. A high current photovoltaic junction box according to claim 3, wherein: the base is internally provided with a trapezoidal guide block, and the trapezoidal guide block is positioned below the diode and in the middle of the first bus bar guide through hole.

5. A high current photovoltaic junction box according to claim 3, wherein: the front surface of the terminal piece is provided with a tin block, and two sides of the tin block are respectively provided with a second bus bar guide through hole and a tin blocking strip.

6. A high current photovoltaic junction box according to claim 2, wherein: holes or small grooves are arranged on the bottom plate of the bonding area, and bonding glue is squeezed into the junction box through the holes or the small grooves to be solidified to form an inverted buckle.

7. A high current photovoltaic junction box according to claim 1, wherein: and a wire pressing buckle is arranged at one end of the base and is in wedge-shaped fit with the base, and the cable penetrates through the middle of the base and the wire pressing buckle and then is connected with the terminal piece.

8. A high current photovoltaic junction box according to claim 7, wherein: the base is filled with pouring sealant to cover the diode, the part of the base above the wire pressing buckle is provided with a hollow bulge, and the height of the bulge is higher than the height of the pouring sealant after the diode is covered by the pouring sealant.