CN108258072B

CN108258072B - Photovoltaic module

Info

Publication number: CN108258072B
Application number: CN201611228081.6A
Authority: CN
Inventors: 邓士锋; 董经兵; 夏正月; 徐洁; 许涛; 邢国强
Original assignee: Canadian Solar Manufacturing Changshu Inc; Atlas Sunshine Power Group Co Ltd
Current assignee: Canadian Solar Inc; Canadian Solar Manufacturing Changshu Inc
Priority date: 2016-12-27
Filing date: 2016-12-27
Publication date: 2023-10-27
Anticipated expiration: 2036-12-27
Also published as: CN108258072A

Abstract

The invention provides a photovoltaic module which comprises a plurality of battery strings, a plurality of bus bars connected with the battery strings and a junction box connected with the bus bars, wherein the battery strings are divided into a left battery string positioned on the left side of the junction box and a right battery string positioned on the right side of the junction box, the bus bars are divided into two left bus bars connected with the left battery string and two right bus bars connected with the right battery string, and the left bus bars and the right bus bars are connected into the junction box in a staggered arrangement. According to the invention, the bus bars are arranged in a staggered manner, so that the positions of the bus bar access ends are adjusted, the trouble that the two bus bar access ends on the inner side cannot correspond to the lead ports in the junction box due to too close distance in the prior art is avoided, the multi-main grid line photovoltaic module can use the conventional junction box without the need of re-die opening design, the production cost can be reduced, and the production efficiency can be improved.

Description

Photovoltaic module

Technical Field

The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic module.

Background

The number of main grid lines of the solar cell is gradually increased from the first two to three and four, but five main grid line cells are already present in the industry and are gradually produced in mass production. For solar cells, after the number of main grid lines is increased, the improvement of the efficiency of the cells and the improvement of CTM can be brought under the condition of keeping the shading area unchanged, and the multi-main grid technology can also reduce the resistance of the cells and save the consumption of silver paste, so that the multi-main grid (more than five main grid lines) technology has become an industry hot spot in recent years.

Fig. 1 and 2 show a conventional photovoltaic module, in which four main grid line battery pieces are adopted and connected in series through four welding strips 1, and finally, the four main grid line battery pieces are connected into a photovoltaic junction box 3 through leading-out ends of bus bars 2, the bus bars 2 are mainly used for connecting the four welding strips 1 on the battery pieces, the four welding strips 1 are uniformly distributed on the surfaces of the battery pieces and are far away from the edges of the battery pieces, and the current main grid photovoltaic module adopts three main grid battery pieces and four main grid battery pieces, so that the specifications of the photovoltaic junction box matched with the current main grid line battery pieces are approximately the same, the leading-out ends of the four bus bars 2 are respectively connected into the photovoltaic junction box 3 through four ports 6, a bypass diode 4 is arranged between the leading-out ends of two adjacent bus bars, and the distance L between the leading-out ends 5 (or ports) of the two bus bars on the inner side is far away due to the fact that the welding strips are far away from the edges of the battery pieces.

However, for the photovoltaic module using multiple primary grid cells, the primary grid lines are also distributed at the edge of the cell surface due to the large increase of the number of the primary grid lines, the two inner bus bars 2 need to extend inwards to the edge of the cell and be connected with the welding strip at the edge, so that the length of the bus bars 2 and the positions of the bus bar outlets 5 tend to be increased, so that the two inner bus bar outlets 5 are closer (i.e., L tends to be smaller), and in this case, the conventional photovoltaic junction box cannot be directly used, because the positions of the bus bar outlets 5 after being changed cannot be corresponding to the positions of the ports of the existing junction box and are welded, and the structure of the junction box must be redesigned, so that the cost tends to be increased.

Disclosure of Invention

In view of the above, the present invention provides a photovoltaic module to improve the junction box access problem of a multi-main grid line module.

Specifically, the invention is realized by the following technical scheme: the utility model provides a photovoltaic module, includes a plurality of battery strings, connects a plurality of bus bars and the terminal box of connecting the bus bar of battery string, a plurality of battery strings divide into the left side battery string that is located the terminal box left side and the right side battery string that is located the terminal box right side, the bus bar divide into with two left side bus bars that left side battery string is connected and with two right side bus bars that right side battery string is connected, left side bus bar with right side bus bar is the cross setting and inserts in the terminal box.

Further, a plurality of lead ports which are arranged in a straight line are arranged in the junction box, each lead port comprises two left side ports and two right side ports, and the left side ports and the right side ports are respectively positioned at the left side and the right side of the center line of the junction box; the left bus bar is connected with the right port, and the right bus bar is connected with the left port.

Further, the two left bus bars are staggered with each other, and the two right bus bars are staggered with each other.

Further, the battery string comprises battery pieces and welding strips connected with the battery pieces, and the number of the main grid lines on the surfaces of the battery pieces exceeds 10.

According to the invention, the bus bars are arranged in a staggered manner, so that the positions of the bus bar access ends are adjusted, the trouble that the two bus bar access ends on the inner side cannot correspond to the lead ports in the junction box due to too close distance in the prior art is avoided, the multi-main grid line photovoltaic module can use the conventional junction box without the need of re-die opening design, the production cost can be reduced, and the production efficiency can be improved.

Drawings

Fig. 1 is a partial back view of a prior art photovoltaic module.

Fig. 2 is a connection manner of a junction box and a bus bar of a photovoltaic module in the prior art.

Fig. 3 is a partial back view of a photovoltaic module according to the present invention.

Fig. 4 is a connection mode of the junction box and the bus bar of the photovoltaic module according to the present invention.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

As shown in fig. 3 and 4, the present invention provides a photovoltaic module including a plurality of battery strings 10, bus bars 20 connecting the battery strings, and a junction box 30 connecting the bus bars.

The battery strings 10 are distributed on the left and right sides of the junction box 30, and each battery string includes a battery piece 11 and a welding strip 12 connected with the battery piece 11, and the battery strings 10 can be divided into a left battery string S1 located on the left side of the junction box 30, a right battery string S2 located on the right side of the junction box 30, and an intermediate battery string S3 connected between the left battery string S1 and the right battery string S2. The battery piece 11 is a multi-main grid line battery piece, and the number of main grid lines exceeds 10.

The bus bar 20 is divided into two left bus bars A1, A2 connected with the left battery string S1 and extending into the junction box 30, and two right bus bars B1, B2 connected with the right battery string S2 and extending into the junction box 30. The left bus bars A1, A2 and the right bus bars B1, B2 are L-shaped, and each has one end connected to the welding strip 12 at the head and tail ends of the battery string and the other end provided with an access end 21 for accessing the junction box 30.

The junction box 30 is internally provided with a plurality of lead ports 31 which are arranged in a straight line and are in one-to-one correspondence with the bus bar access ends 21, a bypass diode 32 which is positioned between two adjacent lead ports 31, and positive and negative electrode connectors 33 which are led out from the first and last two lead ports 31, wherein the number of the lead ports 31 is the same as that of the bus bars 20, and the lead ports 31 are arranged in the junction box 30 from left to right along the straight line direction, in the preferred embodiment of the invention, the lead ports 31 comprise two left side ports C1 and C2 and two right side ports D1 and D2, and the left side ports C1 and C2 and the right side ports D1 and D2 are respectively positioned at the left side and the right side of the central line O-O' of the junction box 30.

Since the multi-main-grid battery plate 11 is adopted in the invention, in order to ensure that the access end 21 of the bus bar 20 can be smoothly accessed to the lead port 31 of the junction box 30, the invention adopts a bus bar staggered access mode, namely, the left bus bars A1 and A2 extend rightwards and are accessed to the right ports D1 and D2 in the junction box 30, the right bus bars B1 and B2 extend leftwards and are accessed to the left ports C1 and C2 in the junction box 30, so that the left bus bars A1 and A2 and the right bus bars B1 and B2 are staggered to be accessed to the junction box 30, and in the best embodiment of the invention, the two left bus bars A1 and A2 are staggered to each other, and the two right bus bars B1 and B2 are staggered to each other. Therefore, the problem that the distance between the two bus bars at the inner side is too small can be avoided, and the position of the four lead ports 31 inside the junction box 30 is not required to be adjusted, so that the existing junction box 30 can be directly applied to the photovoltaic module with multiple main grid lines.

Of course, since there is a risk of short circuit in the staggered arrangement of the bus bars 20, in the preferred embodiment of the present invention, insulating spacers (not shown) are disposed between the two bus bars that are staggered with each other, and will not be described herein.

Therefore, the bus bars 20 are arranged in a staggered manner, so that the positions of the bus bar access ends 21 are adjusted, the trouble that the two bus bar access ends 21 on the inner side cannot correspond to the lead ports 31 in the junction box 30 due to too close distance in the prior art is avoided, the conventional junction box 30 can be used in the multi-main grid line photovoltaic module, the mold opening design is not required, the production cost is reduced, and the production efficiency is improved.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. The utility model provides a photovoltaic module, includes a plurality of battery strings, connects a plurality of bus bars of battery string and the terminal box of connecting the bus bar, a plurality of battery strings divide into the left side battery string that is located the terminal box left side and the right side battery string that is located the terminal box right side, the bus bar divide into with two left side bus bars that are connected of left side battery string and with two right side bus bars that are connected of right side battery string, its characterized in that, left side bus bar with right side bus bar is the staggered arrangement and inserts in the terminal box;

a plurality of lead ports which are arranged in a straight line are arranged in the junction box, and a bypass diode is arranged between two adjacent lead ports; the lead port comprises two left side ports and two right side ports, and the left side ports and the right side ports are respectively positioned at the left side and the right side of the central line of the junction box; the left bus bar is connected with the right port, and the right bus bar is connected with the left port.

2. The photovoltaic module of claim 1, wherein the two left side bus bars are staggered with respect to each other and the two right side bus bars are also staggered with respect to each other.

3. The photovoltaic module of claim 2, wherein the cell string comprises a cell and a solder strip connecting the cell, and the number of main grid lines on the surface of the cell exceeds 10.