CN211929508U

CN211929508U - Photovoltaic module

Info

Publication number: CN211929508U
Application number: CN202021136467.6U
Authority: CN
Inventors: 王刚; 夏靖辉; 何晨旭; 徐伟智; 黄海燕; 陆川
Original assignee: Haining Astronergy Technology Co ltd; Chint Solar (Zhejiang) Co Ltd
Current assignee: Chint New Energy Technology Co Ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-11-13
Anticipated expiration: 2030-06-18

Abstract

The utility model discloses a photovoltaic module, include: the number of the power generation units is odd, every two power generation units are connected with a first bypass diode in parallel, an independent power generation unit is connected with a second bypass diode in parallel independently, the independent power generation unit is connected with the adjacent power generation unit in series or leads out a positive electrode and a negative electrode through a bypass bus bar with a preset length, and the independent power generation unit is connected with the second bypass diode through a homopotential bus bar. Through with the electric potential busbar, be favorable to connecing each terminal box to arrange the position of same water flat line on the backplate, consequently can be convenient for the connection of each terminal box, avoid the condition of connecting the overlength to appear, and then reduce the cable cost to reduce corresponding resistance loss, in addition, in view of the many equal divisions section of battery piece and corresponding circuit connection mode, can reduce the electric current of subassembly inner circuit and subassembly output, and reduce the hot spot risk.

Description

Photovoltaic module

Technical Field

The utility model relates to a photovoltaic power generation technical field, in particular to photovoltaic module.

Background

With the development of photovoltaic power generation technology, high-efficiency and high-power photovoltaic module products become development directions in the industry. The current relatively large-scale high-efficiency photovoltaic module products are half-sheet and large-size high-efficiency batteries, the sizes of the batteries are mainly 158.75-158.75 mm, 163-163 mm and 166-166 mm, the power of the module breaks through more than 400W, and the module end cost and the final LCOE cost are effectively reduced.

Although the internal loss of the module is greatly reduced due to the design of the half piece, the half piece design also causes more resistance loss along with the continuous increase of the size of the solar cell, and simultaneously causes larger load to a matched junction box, an inverter at a power station end, a combiner box and the like.

In addition, the number of the power generation units of the existing photovoltaic module is usually even, and when the number of the power generation units is odd, the junction boxes are positioned on two sides of the module, so that wiring is complicated, and the automatic production of the photovoltaic module is not facilitated.

Therefore, how to provide a photovoltaic module suitable for odd number of power generation units and reducing resistance loss and reliability risk, and facilitating the automatic production of the photovoltaic module and the wiring of the junction box is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a photovoltaic module, which can reduce the current output by the module internal circuit and the module, and reduce the risk of hot spots.

In order to achieve the above object, the utility model provides a following technical scheme:

a photovoltaic module, comprising: the number of the power generation units is odd, every two power generation units are connected with a first bypass diode in parallel, an independent power generation unit is connected with a second bypass diode in parallel independently, the independent power generation unit is connected with the adjacent power generation unit in series or leads out a positive electrode and a negative electrode through a bypass bus bar with a preset length, and the independent power generation unit is connected with the second bypass diode through a homopotential bus bar.

Preferably, the power generation unit includes m battery strings, each battery string includes a plurality of n equally divided battery pieces, where m and n are integers, and 1< m < n, and each battery string is connected in parallel to form one power generation unit.

Preferably, except for the independent power generation units, the same side polarities of the other adjacent power generation units are opposite, and the same side polarities of the independent power generation unit and the adjacent power generation unit are the same.

Preferably, the photovoltaic module further comprises a first junction box and a second junction box, wherein one first bypass diode is arranged in the first junction box, the number of the first junction box is equal to that of the first bypass diodes, one second bypass diode is arranged in the second junction box, and the first junction box and the second junction box are located on the same side of the bottom of the photovoltaic module backboard.

Preferably, the individual electrical units are located between other said power generating units.

Preferably, the independent power generation unit is located at one end of the other power generation units connected in series.

Compared with the prior art, the technical scheme has the following advantages:

the utility model provides a photovoltaic module, include: the number of the power generation units is odd, every two power generation units are connected with a first bypass diode in parallel, an independent power generation unit is connected with a second bypass diode in parallel independently, the independent power generation unit is connected with the adjacent power generation unit in series or leads out a positive electrode and a negative electrode through a bypass bus bar with a preset length, and the independent power generation unit is connected with the second bypass diode through a homopotential bus bar. Through with the electric potential busbar, be favorable to connecing each terminal box to arrange the position of same water flat line on the backplate, consequently can be convenient for the connection of each terminal box, avoid the condition of connecting the overlength to appear, and then reduce the cable cost to reduce corresponding resistance loss, in addition, in view of the many equal divisions section of battery piece and corresponding circuit connection mode, can reduce the electric current of subassembly inner circuit and subassembly output, and reduce the hot spot risk.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic front structural view of a photovoltaic module a according to a first embodiment of the present invention;

fig. 2 is a schematic circuit layout diagram of a photovoltaic module a according to a first embodiment of the present invention;

fig. 3 is a schematic back structural view of a photovoltaic module a according to a first embodiment of the present invention;

fig. 4 is a schematic front structural view of a photovoltaic module B according to a second embodiment of the present invention;

fig. 5 is a schematic circuit layout diagram of a photovoltaic module B according to a second embodiment of the present invention;

fig. 6 is a schematic back structural view of a photovoltaic module B according to a second embodiment of the present invention;

fig. 7 is a schematic front structural view of a photovoltaic module C according to a third embodiment of the present invention;

fig. 8 is a schematic circuit layout diagram of a photovoltaic module C according to a third embodiment of the present invention;

fig. 9 is a schematic back structural view of a photovoltaic module C according to a third embodiment of the present invention.

The reference numbers are as follows:

1 is a battery piece, 2 is a bypass bus bar, 3 is a common potential bus bar, 4 is a bypass diode, and 5 is a junction box.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1 to fig. 9.

The embodiment of the utility model provides a photovoltaic module, include: the number of the power generation units is odd, every two power generation units are connected with a bypass diode 4 in parallel, an independent power generation unit is connected with a bypass diode 4 in parallel, for distinguishing, the bypass diode 4 connected with every two power generation units in parallel is marked as a first bypass diode, the bypass diode 4 connected with an independent power generation unit in parallel is marked as a second bypass diode, the independent power generation unit is connected with the adjacent power generation unit in series or leads out a positive electrode and a negative electrode through a bypass bus bar 2 with preset length, and the independent power generation unit is connected with the second bypass diode through a same-potential bus bar 3. For the power generation units with even number, the photovoltaic module replaces one power generation unit through the bypass bus bar 2, and in addition, through the same potential bus bar 3, the connection of each junction box 5 is facilitated to be arranged at the position of the same horizontal line on the backboard, so that the connection of each junction box 5 can be facilitated, the situation of overlong connecting line is avoided, the cost of the cable is reduced, and the corresponding resistance loss is reduced. The method comprises the following specific steps:

the power generation unit comprises m battery strings, each battery string comprises a plurality of n battery chips which are equally divided, wherein m and n are integers, 1< m < n, the battery strings are connected in parallel to form one power generation unit, the power generation units are arranged in a transverse mode, the power generation units are X power generation units in total, y bypass diodes 4 are shared by the photovoltaic modules, and y is X/2+ 0.5. It should be noted that, except for the power generating units of the independent parallel bypass diodes 4, the same-side polarities of all adjacent power generating units are opposite, the same-side polarity of the independent power generating unit is the same as that of the adjacent power generating unit, and the two power generating units are connected in series by using the bypass bus bar 2 with the preset length, wherein the positive and negative electrode junction boxes 5 of the photovoltaic module are positioned on the same side of the bottom of the photovoltaic module backboard.

The photovoltaic modules in three different typesetting forms are taken as an example for illustration and are respectively marked as the photovoltaic module A, B, C.

For the photovoltaic module a, please refer to fig. 1 to fig. 3, the battery pieces 1 are cut in three equal parts, preferably without damage, which can greatly reduce the battery efficiency loss caused by laser scribing and reduce the risk of mismatch of the cut pieces, the plurality of battery pieces 1 are connected into one string by interconnection materials, 10 strings are counted, and the strings are arranged in the transverse direction, each string has the same number of three-part battery pieces 1, wherein every two strings of battery strings are connected in series and parallel to form a power generation unit, and 5 power generation units are counted, and the battery pieces are arranged in the transverse direction from left to right. The second power generation unit and the third power generation unit are connected through a bypass bus bar 2 from the left, and the third power generation unit is connected with a same-potential bus bar 3. From left to right, the left end is led out for the positive pole, the right end is led out for the negative pole, two power generation units close to the left end are connected in parallel with a first bypass diode, two power generation units close to the right end are connected in parallel with a first bypass diode, and meanwhile, the polarities of the adjacent power generation units are opposite on the same side. The middle generating unit is independently connected with a second bypass diode in parallel and is connected with a potential bus bar 3, the same side polarity of the generating unit is the same as that of the left adjacent generating unit, and the two generating units are connected with each other through a bypass bus bar 2. This photovoltaic module A uses three split type terminal boxes, all contains a bypass diode 4 in every split type terminal box, and each terminal box 5 is located the one side that is close to photovoltaic module backplate bottom, preferably is located the position that is close to the long limit of backplate, is equipped with a first bypass diode in the first terminal box 5 promptly, and the number of first terminal box 5 is the same with the number of first bypass diode, is equipped with a second bypass diode in the second terminal box 5, and first terminal box 5 and second terminal box 5 are located the same one side of photovoltaic module backplate bottom.

For the photovoltaic module B, please refer to fig. 4 to 6, the battery pieces 1 are cut into three equal parts, and are connected into a string through the interconnection material, 10 strings are counted, and the string is arranged horizontally, each string has the same number of three battery pieces 1, wherein every two strings of battery strings are connected in series and parallel to form a power generation unit, 5 power generation units are counted, and the string is arranged horizontally from left to right. The left end and the right end are respectively provided with an anode and a cathode to be led out, every two power generation units are connected with a bypass diode 4 in parallel, the power generation unit on the rightmost side is independently connected with a bypass diode 4 in parallel and connected with a same potential bus bar 3, and meanwhile, in order to enable all the junction boxes 5 to be arranged on the same side, the cathode is led out to the same side of the anode by using the bypass bus bar 2. It should be noted that the polarities of the adjacent power generation units are opposite on the same side. This photovoltaic module B uses three split type terminal boxes, is equipped with a bypass diode 4 in every split type terminal box, and each split type terminal box is located same water flat line.

For the photovoltaic module C, please refer to fig. 7 to 9, the cell pieces 1 are cut in three equal parts and connected into a string through the interconnection material, 10 strings are counted, and arranged horizontally, each string has the same number of three-part cell pieces 1, a power generation unit is formed between the cell strings in a serial connection manner, the upper power generation unit and the lower power generation unit are arranged in a mirror symmetry manner, the two power generation units arranged up and down share one bypass diode 4, and 5 bypass diodes 4 are used in total. In addition, the left end and the right end are respectively provided with a positive electrode lead-out and a negative electrode lead-out. It should be noted that the polarities of the power generation units adjacent in the transverse direction are opposite to each other. This photovoltaic module C uses 5 split type terminal boxes, is equipped with a bypass diode 4 in every split type terminal box, and each split type terminal box is located the middle of the backplate bottom and is located same water flat line.

Wherein the homopotential bus bar 3 and the bypass bus bar 2 can be positioned on the back of the cell, between cell strings or between the cell and the edge of the glass.

For the three photovoltaic modules, the side length of the cell piece 1 is larger than or equal to 166mm, the whole cell piece is equally cut into at least three small pieces by laser, the series connection distance range of the cell piece 1 is-2-3 mm, the used interconnection material is conductive adhesive or interconnection strips, and the interconnection strips can be divided into conventional interconnection strips and flexible interconnection strips according to the use condition. When the distance between the battery pieces is less than or equal to 0mm, the series materials of the battery pieces 1 adopt conductive adhesive, flexible interconnection strips or other special materials; when the distance between the sheets is 0-1.5mm, flexible interconnecting strips or other special materials are adopted; when the spacing between the sheets is greater than or equal to 1.5mm, flexible, conventional interconnecting strips or other special materials can be used.

Through setting up each split type terminal box on the same water flat line of backplate bottom, not only the automatic equipment of being convenient for, the wiring between the individual split type terminal box of still being convenient for.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It is right above the utility model provides a photovoltaic module has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A photovoltaic module, comprising: the number of the power generation units is odd, every two power generation units are connected with a first bypass diode in parallel, an independent power generation unit is connected with a second bypass diode in parallel independently, the independent power generation unit is connected with the adjacent power generation unit in series or leads out a positive electrode and a negative electrode through a bypass bus bar with a preset length, and the independent power generation unit is connected with the second bypass diode through a homopotential bus bar.

2. The photovoltaic module of claim 1, wherein the power generation unit comprises m strings, each string comprising a plurality of n equal cell pieces, wherein m and n are integers, and 1< m < n, and each string is connected in parallel to form one power generation unit.

3. The photovoltaic module according to claim 1, wherein the polarities of the same sides of the adjacent power generation units are opposite except for the independent power generation unit, and the polarities of the same sides of the independent power generation unit and the adjacent power generation unit are the same.

4. The photovoltaic module according to claim 1, further comprising a first junction box and a second junction box, wherein one first bypass diode is disposed in the first junction box, the number of the first junction boxes is the same as that of the first bypass diodes, one second bypass diode is disposed in the second junction box, and the first junction box and the second junction box are located on the same side of the bottom of the photovoltaic module backboard.

5. A photovoltaic module according to any one of claims 1 to 4 wherein individual ones of the electrical units are located between other ones of the electrical generation units.

6. A photovoltaic module according to any one of claims 1 to 4 wherein the individual power generation units are located at one end of other power generation units connected in series.