CN214753806U

CN214753806U - Photovoltaic module

Info

Publication number: CN214753806U
Application number: CN202023342975.2U
Authority: CN
Inventors: 王海涛; 戴健; 金浩
Original assignee: Jingke Energy Shangrao Co ltd; Zhejiang Jinko Solar Co Ltd
Current assignee: Jingke Energy Shangrao Co ltd; Zhejiang Jinko Solar Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-11-16
Anticipated expiration: 2030-12-31

Abstract

The embodiment of the utility model provides a relate to photovoltaic module technical field, disclose a photovoltaic module. The utility model discloses in, photovoltaic module includes: the connecting piece is connected with the adjacent double-sided batteries, the positive electrodes of every two adjacent double-sided batteries face opposite directions, one end of the connecting piece is connected with the positive electrode of the double-sided battery, and the other end of the connecting piece is connected with the negative electrode of the adjacent double-sided battery; each of the bifacial batteries includes: the photoelectric conversion device comprises a light receiving surface and a backlight surface which are arranged oppositely, wherein the ratio of the photoelectric conversion efficiency of the backlight surface to the photoelectric conversion efficiency of the light receiving surface is more than or equal to 0.9 and less than 1. The embodiment of the utility model provides a photovoltaic module can improve the subassembly yield under the prerequisite that does not influence the subassembly power.

Description

Photovoltaic module

Technical Field

The embodiment of the utility model provides a relate to photovoltaic module technical field, in particular to photovoltaic module.

Background

In the manufacturing process of the solar module, the traditional battery interconnection technology is to connect the positive electrode and the negative electrode of a plurality of battery units together by using solder strips. In a battery string generally composed of a plurality of batteries, the positive electrodes of all the batteries face in the same direction, and the serial connection of two adjacent batteries is a mode that the front and back surfaces are mutually overlapped, that is, one end of a welding strip is welded on the front surface of one battery, and the other end is welded on the back surface of the adjacent battery.

The inventor finds that at least the following problems exist in the prior art: under the connection mode, the welding strip can generate compressive stress on the edge part of the battery piece, so that the battery piece is easy to generate welding hidden cracks, and the yield of the assembly is not high.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model is to provide a photovoltaic module can improve the subassembly yield under the prerequisite that does not influence the subassembly power.

In order to solve the above technical problem, an embodiment of the present invention provides a photovoltaic module, include: the connecting piece is connected with the adjacent double-sided batteries, the positive electrodes of every two adjacent double-sided batteries face opposite directions, one end of the connecting piece is connected with the positive electrode of the double-sided battery, and the other end of the connecting piece is connected with the negative electrode of the adjacent double-sided battery; each of the bifacial batteries includes: the photoelectric conversion device comprises a light receiving surface and a backlight surface which are arranged oppositely, wherein the ratio of the photoelectric conversion efficiency of the backlight surface to the photoelectric conversion efficiency of the light receiving surface is more than or equal to 0.9 and less than 1.

Compared with the prior art, the embodiment of the utility model has the advantages that every two adjacent anodes of the double-sided batteries are arranged in opposite directions, one end of the connecting piece is connected with the anode of the double-sided battery, and the other end of the connecting piece is connected with the cathode of the adjacent double-sided battery, namely, the connecting piece is positioned at the same side of the two double-sided batteries and does not need to be wound from one side of the double-sided battery to the other side, so that the edge of the double-sided battery is not stressed, the problem of welding and hidden cracking of the battery piece is solved, and the yield of the assembly is improved; meanwhile, the ratio of the photoelectric conversion efficiency of the backlight surface of the double-sided battery to the photoelectric conversion efficiency of the light receiving surface of the double-sided battery is greater than or equal to 0.9 and less than 1, so that even if the anodes of every two adjacent double-sided batteries face opposite directions, the power deviation of each battery piece in the use process is not too large, the problem of power mismatch of the photovoltaic module is avoided, and the integral power of the photovoltaic module is ensured not to be influenced basically.

In addition, the ratio of the photoelectric conversion efficiency of the backlight surface to the photoelectric conversion efficiency of the light receiving surface of the bifacial cell is greater than 0.95.

In addition, the bifacial battery includes: a silicon substrate having a thickness in a range of 100 microns to 140 microns. So set up, can be under the prerequisite of the yield of guaranteeing the silicon substrate and the efficiency of two-sided battery, reduced the cost of silicon substrate.

In addition, the thickness of the silicon substrate is 120 micrometers.

In addition, the double-sided battery is a heterojunction battery. By the arrangement, the battery piece with high double-sided rate can be conveniently prepared.

In addition, the connecting piece is a circular metal wire welding strip. So set up, can reduce the connecting piece to the sheltering from of incident light, promote photovoltaic module's light absorption rate, strengthen photovoltaic module's conversion efficiency.

In addition, the bifacial battery includes: the battery comprises a battery body, a first packaging layer and a second packaging layer, wherein the first packaging layer and the second packaging layer are respectively positioned on two sides of the battery body; the first encapsulation layer includes: front glass and be located front glass with the first buffer layer between the battery body, the second packaging layer includes: the back glass, and be located the back glass with the second buffer layer between the battery body.

Additionally, the first buffer layer and/or the second buffer layer may have a thickness ranging from 0.25 millimeters to 0.28 millimeters. So set up, not only can play sufficient cushioning effect to two-sided battery, can also reduce photovoltaic module's weight.

In addition, the material of the first buffer layer and/or the second buffer layer is ethylene-vinyl acetate copolymer and/or ethylene-octene copolymer.

In addition, the double-sided battery is a multi-main-grid battery piece.

Drawings

Fig. 1 is a front view of a photovoltaic module provided by an embodiment of the present invention;

fig. 2 is a top view of a photovoltaic module according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a double-sided battery provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a battery body according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

The inventor finds that the conventional welding mode, namely the mode that the connecting piece 12 passes through the front surface and the back surface of the battery and the connecting piece 12 and the battery are staggered to some extent, so that the hidden crack problem of the battery edge is caused.

To the above technical problem, the utility model discloses an embodiment relates to a photovoltaic module, as shown in fig. 1, fig. 2, include: the double-sided battery pack comprises a plurality of double-sided batteries 11 and connecting pieces 12 for connecting the adjacent double-sided batteries 11, wherein positive electrodes 111 of every two adjacent double-sided batteries 11 face opposite directions, one end of each connecting piece 12 is connected to the positive electrode 111 of each double-sided battery 11, and the other end of each connecting piece 12 is connected to a negative electrode 112 of each adjacent double-sided battery 11; each double-sided battery 11 includes: the ratio of the photoelectric conversion efficiency of the backlight surface 114 to the photoelectric conversion efficiency of the light-receiving surface 113 is 0.9 or more and less than 1.

Since the positive electrodes 111 of every two adjacent double-sided cells 11 are arranged in opposite directions, one end of the connecting member 12 is connected to the positive electrode 111 of the double-sided cell 11, and the other end is connected to the negative electrode 112 of the adjacent double-sided cell 11, that is, the connecting member 12 is located on the same side of the two double-sided cells 11 (that is, the double-sided cells 11 use the same-side welding method for front and back sides), and does not need to be wound from one side to the other side of the double-sided cell 11, so that compressive stress is not caused to the edge of the double-sided cell 11, the problem of welding hidden cracking of the cell pieces is improved, and the yield of the assembly is improved, and at the same time, since the ratio of the photoelectric conversion efficiency of the backlight surface 114 of the double-sided cell 11 to the photoelectric conversion efficiency of the light-receiving surface 113 of the double-sided cell 11 is greater than or equal to 0.9 and less than 1, that a cell with a large double-sided rate (front efficiency/back efficiency) is used, even if the positive electrodes 111 of every two adjacent double-sided cells 11 are arranged in opposite directions, The power deviation of each cell in the using process is not too large, the problem of power mismatch of the photovoltaic module is avoided, and the integral power of the photovoltaic module is guaranteed not to be affected basically.

Alternatively, the ratio of the photoelectric conversion efficiency of the backlight surface 114 of the double-sided battery 11 to the photoelectric conversion efficiency of the light receiving surface 113 may be greater than 0.95, that is, the double-sided ratio of the double-sided battery 11 is greater than 0.95. In practical applications, the double-sided battery 11 may be a heterojunction battery, so as to ensure that the double-sided battery 11 has a high double-sided rate. Of course, some processes can be combined to ensure that the front efficiency and the back efficiency of the cell are consistent, for example, different cell grid line number designs are performed on the front side and the back side, or the front side (high efficiency side) uses low light trapping textured surface and the back side (low efficiency side) uses high light trapping textured surface.

In the present embodiment, the battery pattern design may be an MBB structure battery, that is, the double-sided battery 11 is a multi-master-grid battery cell, and thus, the front-side and back-side battery pastes are both greatly reduced, the usage amount of the MBB paste is reduced from 200mg to 160mg, and the usage amount is reduced by 20%.

As shown in fig. 3, specifically, the double-sided battery 11 may include: the battery comprises a battery body 20, a first packaging layer and a second packaging layer, wherein the first packaging layer and the second packaging layer are respectively positioned on two sides of the battery body 20; the first encapsulation layer includes: front glass 21, and first buffer layer 22 between front glass 21 and cell body 20, the second packaging layer includes: a back glass 23, and a second buffer layer 24 between the back glass 23 and the cell body 20.

As shown in fig. 4, the battery body 20 may include, among others: a silicon substrate 115, an intrinsic type hydrogenated amorphous silicon layer 116, a p type hydrogenated amorphous silicon layer 117, a Transparent Conductive Oxide (TCO) layer 118 and a positive electrode 111 sequentially stacked on one side of the silicon substrate 115, and an intrinsic type hydrogenated amorphous silicon layer 116, an n type hydrogenated amorphous silicon layer 119, a Transparent Conductive Oxide (TCO) layer 118 and a negative electrode 112 sequentially stacked on the other side of the silicon substrate 115. Since the double-sided battery 11 uses the front-back-side same-side welding mode, the edge of the double-sided battery 11 is not subjected to compressive stress, and the excessively thick silicon substrate 115 is not required to be used as a support, so that the thinner silicon substrate 115 can be used, and meanwhile, the preparation yield of the excessively thin silicon substrate 115 is not high and influences on the battery efficiency are considered, so that in the embodiment, the thickness of the silicon substrate 115 ranges from 100 micrometers to 140 micrometers, and optionally, the thickness of the silicon substrate 115 is 120 micrometers.

Compared with the prior art, the connecting piece 12 has a large risk of hidden cracking of the edge of the battery in a mode of crossing the front side and the back side of the battery, and has a certain requirement on the thickness of the stacked battery, so that a thicker buffer layer is needed to protect the battery and increase the thickness of the battery. In the present embodiment, since the cell edge is not subjected to compressive stress, and a thicker cell is not required for matching, a thinner buffer layer may be provided, for example, the thickness of the first buffer layer 22 and/or the second buffer layer 24 may range from 0.25 mm to 0.28 mm, so that not only the double-sided cell 11 can be sufficiently buffered, but also the weight of the photovoltaic module can be reduced.

The material of the first buffer layer 22 and/or the second buffer layer 24 may be an ethylene-vinyl acetate copolymer and/or an ethylene-octene copolymer, and the grammage of the buffer layer can be reduced from 480g-560g to 430g-460g in the related art, and the reduction range is about 10%.

Specifically, the front glass 21 can be made of ultrathin glass with a thickness of 1.8mm-2.0mm, can be made by a calendering process (molten glass is poured on a calendering forming table, rolled by a roller with patterns, annealed and cut, and applied to a photovoltaic module), and the back glass 23 can be made with a thickness of 1.8mm-2.0mm, and can be made by a voltammetry process.

Optionally, as shown in fig. 1, the connecting member 12 may be a circular wire solder strip, that is, the cross section of the connecting member 12 is circular, so that the circular wire solder strip has a curvature radian on both sides of the width direction, thereby reducing the shielding of the connecting member 12 on incident light, and meanwhile, the cylindrical surface of the connecting member 12 can reflect the incident light into the double-sided battery 11 as much as possible, thereby improving the light absorption rate of the photovoltaic module and enhancing the conversion efficiency of the photovoltaic module.

Above-mentioned photovoltaic module is in preparation process, and the welding mode is specifically as follows: moving the first battery and the second battery to a station, drawing out a welding wire (covering electrodes on the same sides of the two batteries), and cutting off the welding wire; then, the first battery and the second battery are sucked by the suction cup, the welding wire is pulled out, the welding wire is pressed on the back electrode of the second battery, the back electrode of the third battery is synchronously pressed on the welding wire (the third battery can be placed at a certain distance from the second battery, for example, 0.3mm), and the third battery enters the heating area for welding.

Compared with the prior art, the embodiment of the utility model, the connecting piece 12 is positioned at the same side of the two double-sided batteries 11, thus improving the problem of hidden crack of the battery piece during welding and improving the rate of finished products of the components; meanwhile, the problem of power mismatch of the photovoltaic module is avoided by using batteries with large double-sided rate, and the power of the module is guaranteed not to be affected basically.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims

1. A photovoltaic module, comprising: the connecting piece is connected with the adjacent double-sided batteries, the positive electrodes of every two adjacent double-sided batteries face opposite directions, one end of the connecting piece is connected with the positive electrode of the double-sided battery, and the other end of the connecting piece is connected with the negative electrode of the adjacent double-sided battery;

each of the bifacial batteries includes: the photoelectric conversion device comprises a light receiving surface and a backlight surface which are arranged oppositely, wherein the ratio of the photoelectric conversion efficiency of the backlight surface to the photoelectric conversion efficiency of the light receiving surface is more than or equal to 0.9 and less than 1.

2. The photovoltaic module according to claim 1, wherein a ratio of a photoelectric conversion efficiency of the backlight surface to a photoelectric conversion efficiency of the light receiving surface of the bifacial cell is greater than 0.95.

3. The photovoltaic module of claim 2, wherein the bifacial cell comprises: a silicon substrate having a thickness in a range of 100 microns to 140 microns.

4. The photovoltaic module of claim 3, wherein the silicon substrate has a thickness of 120 microns.

5. The photovoltaic module of claim 1, wherein the bifacial cell is a heterojunction cell.

6. The photovoltaic module of claim 1, wherein the connector is a circular wire solder strip.

7. The photovoltaic module of claim 1, wherein the bifacial cell comprises: the battery comprises a battery body, a first packaging layer and a second packaging layer, wherein the first packaging layer and the second packaging layer are respectively positioned on two sides of the battery body;

the first encapsulation layer includes: front glass and be located front glass with the first buffer layer between the battery body, the second packaging layer includes: the back glass, and be located the back glass with the second buffer layer between the battery body.

8. The photovoltaic module of claim 7, wherein the first and/or second buffer layers have a thickness in a range from 0.25 mm to 0.28 mm.

9. The photovoltaic module of claim 7, wherein the first buffer layer is made of ethylene-vinyl acetate copolymer or ethylene-octene copolymer, and the second buffer layer is made of ethylene-vinyl acetate copolymer or ethylene-octene copolymer.

10. The photovoltaic module of claim 1, wherein the bifacial cell is a multiple main grid cell.