阅读说明：本技术 一种新型光伏组件排布结构及其实现方法 (Novel photovoltaic module arrangement structure and implementation method thereof ) 是由 楼曹鑫 汪婷婷 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种新型光伏组件排布结构,包括若干个设置在层压件内的电池串,其中,层压件的背部分别设有若干个带旁路功能的第一接线盒和若干个仅实现互联功能的第二接线盒,若干个第一接线盒与若干个第二接线盒之间通过连接导线连接,若干个电池串与对应的第一接线盒或第二接线盒连接；本发明还公开了一种新型光伏组件排布结构的实现方法。将层压件内通过汇流条互联的结构转换为光伏组件外部互联的结构,减少了内部互联的设计以及降低了内部互联工艺的难度,并且改善了正面的外观,降低了焊接难度,同时还解决了现有技术中层压件内部容易短路发热的问题。(The invention discloses a novel photovoltaic module arrangement structure which comprises a plurality of battery strings arranged in a laminated part, wherein the back of the laminated part is respectively provided with a plurality of first junction boxes with bypass functions and a plurality of second junction boxes only realizing interconnection functions, the plurality of first junction boxes and the plurality of second junction boxes are connected through connecting wires, and the plurality of battery strings are connected with the corresponding first junction boxes or the corresponding second junction boxes; the invention also discloses a realization method of the novel photovoltaic module arrangement structure. The structure that interconnects through the busbar in with the lamination piece converts the outside interconnected structure of photovoltaic module into, has reduced the design of inside interconnection and has reduced the degree of difficulty of inside interconnection technology to improve positive outward appearance, reduced the welding degree of difficulty, still solved the problem that the inside short circuit of lamination piece generates heat easily in the prior art simultaneously.)

1. The utility model provides a novel photovoltaic module structure of arranging, includes that a plurality of sets up the battery cluster in the lamination piece, wherein, the back of lamination piece is equipped with a plurality of first terminal boxes that take bypass function and a plurality of second terminal box that only realizes interconnection function respectively, is connected through connecting wire between a plurality of first terminal box and a plurality of second terminal box, and a plurality of battery cluster is connected with corresponding first terminal box or second terminal box.

2. The novel photovoltaic module arrangement according to claim 1, wherein: the first junction box is internally provided with a protection element and two first conducting strips, and the two first conducting strips are respectively electrically connected with the protection element.

3. The novel photovoltaic module arrangement according to claim 2, wherein: the protection element is a Schottky diode or an MOS tube.

4. The novel photovoltaic module arrangement according to claim 1, wherein: and a second conducting strip is arranged inside the second junction box.

5. The novel photovoltaic module arrangement according to claim 1, wherein: the battery string comprises two battery bars, and the positive ends of the two battery bars or the negative ends of the two battery bars are connected in parallel through a bus bar.

6. The novel photovoltaic module arrangement according to claim 5, wherein: and the welding strips at the end parts of the two battery bars are welded on the bus bars in a staggered manner.

7. The novel photovoltaic module arrangement according to claim 1, wherein: the battery string comprises a battery strip, and bus bars are connected to welding strips at the positive end and the negative end of the battery strip.

8. A novel photovoltaic module arrangement according to claim 5 or 7, characterized in that: the battery string is connected with a first conducting strip inside the first junction box or a second conducting strip inside the second junction box in a welding mode through the bus bar.

9. The novel photovoltaic module arrangement according to claim 1, wherein: and the first junction box and the second junction box are both connected with the back of the laminated part through silica gel bonding.

10. A method of implementing a novel photovoltaic module arrangement according to any of claims 1 to 9, characterized in that it comprises the following steps:

bonding a designed number of first junction boxes and second junction boxes at corresponding positions of the back of the laminated part through silica gel;

secondly, welding the bus bars on the battery strings with the conducting strips in the corresponding junction boxes;

and thirdly, connecting the corresponding junction boxes through connecting wires.

Technical Field

The invention belongs to the technical field of photovoltaic modules, and particularly relates to a novel photovoltaic module arrangement structure and an implementation method thereof.

Background

With the continuous vigorous development of the photovoltaic industry, the application range of photovoltaic power generation component products is more and more extensive, but the photovoltaic power generation component products are limited by the self structure of the photovoltaic products, and many special structure component requirements aiming at application scenes cannot be realized.

The photovoltaic module power generation laminating part comprises a photovoltaic cell, an interconnection structure such as a welding strip bus bar, light-transmitting glass, a weather-resistant packaging material and the like; taking a typical crystalline silicon photovoltaic single-glass laminate as an example: the thickness of the laminated part is about 5mm, the laminated part further comprises light-transmitting glass with the thickness of 3.2mm, namely the thickness of the stacked internal structures of the battery, the welding strip bus bar, the two-layer packaging EVA, the back plate and the like is only 1.8mm, and considering that the square large-size battery piece is fragile, a large number of battery pieces are interconnected to form the laminated part with the length and width of 2m × 1m, and the laminated part can be often interconnected only with the simplest structure in the typesetting design.

In the general structure, an even string is needed for the assembly to form a loop, and when an odd string is needed, a bus bar is often used for replacing one battery string (the width of the corresponding assembly is increased by about 15mm, the using amount of the bus bar is increased by 1.5m, the bus bar is easy to bend after being laminated, the appearance of the assembly is influenced (particularly, a black assembly and a front silver bus bar are very sharp), and the number of the battery pieces corresponding to a single string of junction box diodes is only half of that of the other strings, so that the process difficulty and the cost are obviously increased). And the current 210mm cell piece product (6 strings of cells in the width direction are too wide, and the glass supply and load are both problematic).

The special assembly is designed according to the product requirements (requirements of limited application environment space, attractive appearance and the like) of customers, such as irregular shapes, special junction box leading-out positions and the like. In consideration of the original structure of the assembly, the use requirement of the diode and the arrangement requirement of the bus bar, many special requirements can hardly be realized.

Disclosure of Invention

The invention aims to provide a novel photovoltaic module arrangement structure to solve the problems in the background technology. The novel photovoltaic module arrangement structure provided by the invention has the characteristics of increasing the applicability of the photovoltaic module in an application environment and expanding the design space of the photovoltaic module.

The invention also aims to provide a method for realizing the novel photovoltaic module arrangement structure.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a novel photovoltaic module structure of arranging, includes that a plurality of sets up the battery cluster in the lamination piece, wherein, the back of lamination piece is equipped with a plurality of first terminal boxes that take bypass function and a plurality of second terminal box that only realizes interconnection function respectively, is connected through connecting wire between a plurality of first terminal box and a plurality of second terminal box, and a plurality of battery cluster is connected with corresponding first terminal box or second terminal box.

In order to protect the internal circuit and weld the bus bar when an abnormal condition occurs, in the invention, a protection element and two first conducting strips are further arranged inside the first junction box, the two first conducting strips are respectively and electrically connected with the protection element, and the protection element is a schottky diode or an MOS tube.

In order to weld with the bus bar, in the invention, a second conducting strip is further arranged inside the second junction box.

In the invention, the battery string comprises two battery bars, the positive ends of the two battery bars or the negative ends of the two battery bars are connected in parallel through a bus bar, and welding strips at the ends of the two battery bars are welded on the bus bar in a staggered manner.

In the invention, the battery string comprises a battery bar, and the welding strips at the positive end and the negative end of the battery bar are connected with bus bars.

Further, the first junction box and the second junction box are connected with the back of the laminated piece through silica gel bonding.

In the invention, the battery string is connected with the first conducting strip inside the first junction box or the second conducting strip inside the second junction box in a welding mode through the bus bar.

Further, the implementation method of the novel photovoltaic module arrangement structure comprises the following steps:

bonding a designed number of first junction boxes and second junction boxes at corresponding positions of the back of the laminated part through silica gel;

secondly, welding the bus bars on the battery strings with the conducting strips in the corresponding junction boxes;

and thirdly, connecting the corresponding junction boxes through connecting wires.

Compared with the prior art, the invention has the beneficial effects that:

1. for the odd-number-string-distributed battery strings, the second junction box is connected with the first junction box through the connecting wire, so that one battery string is replaced, the problem that the structure of the laminated piece in the prior art, which is interconnected through the bus bars, is converted into the structure of the photovoltaic module in the external interconnection in a mode that the battery string is replaced through the internal bus bars is solved, the design of the internal interconnection is reduced, the difficulty of the internal interconnection process is reduced, the appearance of the front side is improved, the welding difficulty is reduced, and meanwhile, the problem that the internal part of the laminated piece in the prior art is easy to short circuit and heat is solved;

2. for the battery string needing long-distance confluence, the long-distance interconnection structure in the laminating part is converted into the external interconnection structure through the connecting lead, so that the production efficiency and the front appearance are improved, and the design space is larger;

3. the photovoltaic module can be interconnected by matching the first junction box, the second junction box and the connecting wires;

4. for the structure with complicated convergence inside the assembly, space utilization is optimized and integrated through the cooperation of the second junction box, the connecting lead and the intelligent junction box, the manufacturing efficiency is improved, the arrangement of the battery strings in the laminating part is consistent with that of a conventional photovoltaic assembly, and only six output bus bars are connected with the conducting strips in the junction box in the manufacturing process of the photovoltaic assembly;

5. the protection element is an MOS tube, the temperature of the MOS tube is low when the MOS tube works, the forward conducting voltage is low, the power consumption is low, the heating is low, and the risks of deformation and fire hazard of the junction box can be effectively reduced; in addition, the MOS tube has high reverse withstand voltage and low leakage current, high-temperature reverse bias breakdown cannot occur, and the problem of thermal escape failure of the diode can be completely solved.

Drawings

Fig. 1 is a schematic structural diagram of interconnection of five battery strings in the prior art;

FIG. 2 is a schematic diagram of a distribution structure of a junction box for interconnecting five battery strings in the prior art;

fig. 3 and 4 are schematic structural views of the battery string of the present invention;

FIG. 5 is a schematic structural view of a battery strip according to the present invention;

fig. 6 is a schematic structural diagram of interconnection of five battery strings in embodiment 1 of the present invention;

fig. 7 is a schematic structural diagram of distribution of a junction box in which five battery strings are interconnected according to embodiment 1 of the present invention;

fig. 8 is a schematic structural diagram of interconnection of three battery strings in embodiment 2 of the present invention;

fig. 9-10 are schematic structural diagrams of the distribution of the junction box in which three strings of battery strings are interconnected according to embodiment 2 of the present invention;

fig. 11 is a schematic structural view of interconnection of a plurality of photovoltaic modules in embodiment 2 of the present invention;

FIG. 12 is a schematic view of a prior art photovoltaic module with complicated internal junction structure;

fig. 13 is a schematic structural view of cell string interconnection in embodiment 3 of the present invention;

fig. 14 is a schematic structural view of the distribution of the junction boxes of the cell string interconnection in embodiment 3 of the present invention;

FIGS. 15-17 are schematic structural views of the first junction box of the present invention;

FIGS. 18-19 are schematic structural views of a second junction box of the present invention;

in the figure: 1. a first battery string; 2. a second battery string; 3. a third battery string; 4. a fourth battery string; 5. a fifth battery string; 6. a bus bar; 7. a laminate; 8. a third junction box; 9. a battery strip; 10. a first junction box; 101. a first conductive sheet; 102. a protective element; 11. a second junction box; 111. a second conductive sheet; 12. connecting a lead; 13. a sixth battery string; 14. a seventh battery string; 15. an eighth battery string; 16. a ninth battery string; 17. an intelligent junction box.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-19, the present invention provides the following technical solutions: the utility model provides a novel photovoltaic module structure of arranging, includes that a plurality of sets up the battery cluster in lamination piece 7, wherein, the back of lamination piece 7 is equipped with a plurality of first terminal box 10 of taking the bypass function and a plurality of second terminal box 11 that only realize the interconnection function respectively, is connected through connecting wire 12 between a plurality of first terminal box 10 and a plurality of second terminal box 11, and a plurality of battery cluster is connected with corresponding first terminal box 10 or second terminal box 11.

In order to protect the internal circuit in the event of an abnormal situation, and to perform welding with the bus bar, in the present invention,

specifically, the first terminal box 10 is provided therein with a protection element 102 and two first conductive sheets 101, and the two first conductive sheets 101 are electrically connected to the protection element 102, respectively.

By adopting the above technical solution, the protection element 102 is used for protecting the internal circuit when an abnormal condition occurs; the first conductive sheet 101 is used for soldering with the bus bar and the connecting wire 12.

Specifically, the protection element 102 is a schottky diode or a MOS transistor, and the MOS transistor is preferred in this application.

By adopting the technical scheme, the MOS tube has low working temperature, low forward conducting voltage, low power consumption and low heat emission, and the deformation and fire risk of the junction box can be effectively reduced; in addition, the MOS tube has high reverse withstand voltage and low leakage current, high-temperature reverse bias breakdown cannot occur, and the problem of thermal escape failure of the diode can be completely solved.

As shown in fig. 15-17, the first terminal box 10 can be designed into different patterns according to actual needs.

Specifically, the second terminal box 11 is provided with a second conductive sheet 111 inside.

By adopting the above technical solution, the second conductive sheet 111 is used for welding with the bus bar and the connecting wire 12.

As shown in fig. 18 to 19, the second terminal box 11 can be designed into different patterns according to actual needs, and one or two second conductive sheets 111 can be designed according to actual needs.

Specifically, the first junction box 10 and the second junction box 11 are both connected with the back of the laminated part 7 through silica gel bonding.

Example 1

In the prior art, when the battery strings are odd strings (taking five strings as an example), the distribution scheme is as follows:

as shown in fig. 1 to 5, each of the first battery string 1, the second battery string 2, the third battery string 3, the fourth battery string 4 and the fifth battery string 5 includes two battery bars 9, wherein the negative terminals of the two battery bars 9 of the first battery string 1 and the fourth battery string 4 are connected in parallel through a bus bar (the welding strips of the negative terminals of the two battery bars 9 are welded to the bus bar 6 in a staggered manner), and the positive terminals of the two battery bars 9 of the second battery string 2, the third battery string 3 and the fifth battery string 5 are connected in parallel through a bus bar;

the positive ends at the two ends of the first battery string 1 are respectively connected with the negative ends at the two ends of the second battery string 2 through bus bars, and the positive ends at the two ends of the fourth battery string 4 are respectively connected with the negative ends at the two ends of the fifth battery string 5 through bus bars;

the bus bars at the middle positions of the first battery string 1 and the second battery string 2 are connected through a third junction box 8 (the third junction box 8 is a junction box in the prior art); the bus bar in the middle position between the third battery string 3 and the fourth battery string 4 is a continuous bus bar; the two ends of the third battery string 3 are connected through a bus bar, and the bus bar at the middle position of the second battery string 2, the bus bar at the middle position of the third battery string 3 and the bus bar connected with the two ends of the third battery string 3 are connected through a third junction box 8; the bus bar in the middle of the fourth battery string 4 and the bus bar in the middle of the fifth battery string 5 are connected by a third junction box 8.

To sum up, when the battery cluster was the odd number cluster and distributes, need realize parallelly connected between the battery cluster through many busbars and the cooperation of a plurality of third terminal boxes 8, it is big to have the inside interconnection design degree of difficulty of photovoltaic module, and the busbar welding degree of difficulty is big to and lead to the problem that the whole width of photovoltaic module increases.

In this embodiment, as shown in fig. 6 to 7, the positive terminals at the two ends of the first battery string 1 are respectively connected to the negative terminals at the two ends of the second battery string 2 through bus bars, the positive terminals at the two ends of the third battery string 3 are respectively connected to the negative terminals at the two ends of the fourth battery string 4 through bus bars, and the solder strips at the two ends of the fifth battery string 5 are respectively connected through bus bars;

the bus bars between the first battery string 1 and the second battery string 2 are connected through a first junction box 10 (with a protection function), the bus bars between the third battery string 3 and the fourth battery string 4 are connected through a first junction box 10, the end parts of the bus bars between the fifth battery string 5 are connected with the first junction box 10, the three first junction boxes 10 are connected through connecting wires 12, the end parts of the bus bars at the two ends of the fifth battery string 5 are respectively connected with a second junction box 11 (only realizing an interconnection function), and the two second junction boxes 11 are both connected with the corresponding first junction boxes 10 through connecting wires 12.

In conclusion, in the embodiment, the two second junction boxes 11 are connected with the first junction box 10 through the connecting wires 12, so that a battery string is replaced, the situation that the battery string is replaced through the internal bus bar in the prior art is avoided, the structure of interconnection through the bus bar in the laminated part is converted into the structure of external interconnection of the photovoltaic module, the design of internal interconnection is reduced, the difficulty of the internal interconnection process is reduced, the front appearance is improved, the welding difficulty is reduced, and meanwhile, the problem that short circuit and heat are easily generated in the laminated part in the prior art is solved.

Example 2

In the prior art, as shown in fig. 8, the sixth battery string 13, the seventh battery string 14 and the eighth battery string 15 are all single battery bars 9, wherein bus bars are respectively connected to solder strips at a negative end of the sixth battery string 13 and a positive end of the eighth battery string 15, the positive end of the sixth battery string 13 is connected with the negative end of the seventh battery string 14 through the bus bars, and the positive end of the seventh battery string 14 is connected with the negative end of the eighth battery string 15 through the bus bars.

In a more common model structure design in BIPV (building integrated photovoltaic) and portable devices, a bus bar at the negative end of the sixth battery string 13 and a bus bar at the positive end of the eighth battery string 15 need to be connected through one bus bar (a third junction box 8 needs to be connected to the connected bus bars).

According to the scheme, the bus bar interconnection with long distance and complexity cannot be manufactured by using equipment, the production efficiency is low, and the deviation of the bus bar in the laminating process can have great influence on products with high appearance requirements.

In the present embodiment, as shown in fig. 9 to 10, the bus bar at the positive terminal of the eighth battery string 15 is connected to the second terminal box 11, the bus bar at the negative terminal of the sixth battery string 13 is connected to the first terminal box 10, and the first terminal box 10 and the second terminal box 11 are connected by the connecting wire 12.

Through adopting above-mentioned technical scheme, convert the inside long distance interconnection structure of lamination part into outside and interconnect through connecting wire 12, improved production efficiency and positive outward appearance, design space is also bigger.

Further, as shown in fig. 11, the interconnection among the photovoltaic modules can also be realized through the cooperation among the first junction box 10, the second junction box 11 and the connecting wires 12.

Example 3

In the prior art, for a complex structure of bus bars inside a module, a situation that a plurality of bus bars need to be led out in a local area may occur, as shown in fig. 12, a plurality of bus bars are separately arranged (a way is to add a plurality of insulating layers, and the bus bars are arranged in a stacked manner in a smaller position), a large number of arrangement operations and insulation (between the bus bars and the battery and between the bus bars) processing exist on a battery piece, and in the operation, not only is the battery subfissure avoided, but also the insulating performance and the bonding performance of each part in a lamination piece are ensured, and the reliability problems of local heating and the like caused by poor welding are avoided, and the preparation difficulty is large.

In the present embodiment, as shown in fig. 13 to 14, the bus bars at the intermediate positions of the first battery string 1 and the second battery string 2 are connected by one second junction box 11, the bus bars at the intermediate positions of the third battery string 3 and the fourth battery string 4 are connected by an intelligent junction box 17, the bus bars at the intermediate positions of the fifth battery string 5 and the ninth battery string 16 are connected by one second junction box 11, and the two second junction boxes 11 are connected to the intelligent junction box 17 by the connection wires 12.

By adopting the technical scheme, space utilization is optimized and integrated, manufacturing efficiency is improved, the arrangement of the battery strings in the laminating part is consistent with that of a conventional photovoltaic module, and only six paths of output bus bars are connected with the conducting strips in the line box in the manufacturing process of the photovoltaic module.

In this embodiment, the intelligent junction box 17 is a six-input cascade optimizer.

In summary, for the odd-numbered cell strings distributed in series, the second junction box is connected with the first junction box through the connecting wire, so that one cell string is replaced, the problem that in the prior art, the structure of interconnection through the bus bars in the laminated part is converted into the structure of external interconnection of the photovoltaic module in a mode of replacing the cell string through the internal bus bars is avoided, the design of internal interconnection is reduced, the difficulty of the internal interconnection process is reduced, the front appearance is improved, the welding difficulty is reduced, and meanwhile, the problem that short circuit and heating are easy to occur in the laminated part in the prior art is solved; for the battery string needing long-distance confluence, the long-distance interconnection structure in the laminating part is converted into the external interconnection structure through the connecting lead 12, so that the production efficiency and the front appearance are improved, and the design space is larger; the photovoltaic module can be interconnected by matching the first junction box, the second junction box and the connecting wires; for the structure with complicated convergence inside the assembly, space utilization is optimized and integrated through the cooperation of the second junction box, the connecting lead and the intelligent junction box, the manufacturing efficiency is improved, the arrangement of the battery strings in the laminating part is consistent with that of a conventional photovoltaic assembly, and only six output bus bars are connected with the conducting strips in the junction box in the manufacturing process of the photovoltaic assembly; the protection element is an MOS tube, the temperature of the MOS tube is low when the MOS tube works, the forward conducting voltage is low, the power consumption is low, the heating is low, and the risks of deformation and fire hazard of the junction box can be effectively reduced; in addition, the MOS tube has high reverse withstand voltage and low leakage current, high-temperature reverse bias breakdown cannot occur, and the problem of thermal escape failure of the diode can be completely solved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.