TW202017201A - Photovoltaic module - Google Patents

Abstract

A photovoltaic module including a plurality of solar cells, a plurality of first connectors, a plurality of second connectors and at least one third connector. The plurality of solar cells are arranged in a first direction. The plurality of first connectors are respectively disposed on front surfaces of the plurality of solar cells, and the plurality of first connectors extend in a second direction different from the first direction. The plurality of second connectors are respectively disposed on rear surfaces of the plurality of solar cells, and the plurality of second connectors extend in a third direction different from the first direction. The at least one third connector is located beside a side of the plurality of solar cells, extends along the side, and connects an end of the first connector on one of two adjacent ones of the plurality of solar cells with an end of the second connector on other one of the two adjacent ones of the plurality of solar cells.

Description

Solar photovoltaic module

The invention relates to a photovoltaic module, and in particular to a solar photovoltaic module.

Generally speaking, in the existing solar cells, a plurality of finger electrodes are usually provided on the solar cell body. The finger electrodes are used to collect the current generated by the solar cell body due to light irradiation, and then the bus bar is used to collect The currents collected by multiple finger electrodes lead these currents out.

However, as the photoelectric conversion efficiency of solar cells continues to improve, how to improve the photoelectric conversion efficiency and output power of solar photovoltaic modules is also an important issue currently facing those skilled in the art. Among them, reducing the arrangement gap of solar cells in the solar photovoltaic module to increase the effective power generation area of the module is the technical solution adopted by the back electrode solar photovoltaic module and the laminated solar photovoltaic module.

The invention provides a solar photovoltaic module with good photoelectric conversion efficiency.

A solar photovoltaic module according to an embodiment of the present invention includes a plurality of solar cells, a plurality of first connectors, a plurality of second connectors, and at least a third connector. A plurality of solar cells are arranged along the first direction. The plurality of first connectors are respectively disposed on the front surfaces of the plurality of solar cells, and the plurality of first connectors extend in a second direction different from the first direction. The plurality of second connectors are respectively disposed on the back of the plurality of solar cells, and the plurality of second connectors extend in a third direction different from the first direction. At least one third connector is located beside the side of the plurality of solar cells, extends along the side, and connects one end of the first connector on one of the two neighbors of the plurality of solar cells to two of the plurality of solar cells One end of the second connector on the other of the neighbors.

Based on the above, a solar photovoltaic module according to an embodiment of the present invention has a third connector on the side of the solar cell sheet. The first connector on one of the adjacent solar cells can pass through the third connector and the phase The second connector on the other solar cell is connected, and the connector does not need to pass through the overlapping area between two adjacent solar cells, which can reduce the number of solar cells in the lamination process. Risk of rupture of solar cells. In addition, the third connector is placed beside the side and does not affect the effective light receiving area, so that the electric energy generated by the light can be effectively transmitted to the adjacent another solar cell through the third connector located on the side, and maintain a good photoelectricity Conversion efficiency.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

FIG. 1A is a schematic top view of a solar photovoltaic module according to an embodiment of the invention. FIG. 1B is a schematic side view of the solar photovoltaic module according to FIG. 1A on a side adjacent to the section line I-I'. 1A and 1B, in this embodiment, the solar photovoltaic module 100A includes a plurality of solar cells 110, a plurality of first connection members 120, a plurality of second connection members 130, at least one third connection member 140 . In this embodiment, each solar cell 110 has a front side 112 and a back side 114, where the front side 112 is the light-receiving side and the back side 114 is the backlight side. However, the invention is not limited to this. In other embodiments, the front side 112 and the back side 114 may be light receiving surfaces at the same time. In the present embodiment, the number of the plurality of solar cells 110 in the embodiment of FIGS. 1A and 1B only shows three by way of example. However, those skilled in the art can increase or decrease the number of solar cells 110 according to the actual situation, and the invention is not limited thereto. Each solar cell 110 may include a plurality of stacked semiconductor layers, such as an N-type semiconductor layer and a P-type semiconductor layer. In some embodiments, each solar cell 110 may be a 6-inch silicon-based solar cell. In other embodiments, each solar cell 110 can independently be 1/2 cut, 1/3 cut, 1/4 cut, 1/5 cut, 1/6 cut, 1/7 cut or 1/8 cut 6-inch silicon-based solar cell dicing sheet, the invention is not limited to this. If the solar cell 110 is a 6-inch solar cell cutting chip, the current generated by the 6-inch solar cell cutting chip is lower than that of the 6-inch silicon-based solar cell chip, so the ohmic loss of the 6-inch solar cell cutting chip is lower than that of the 6-inch solar cell cutting chip. The ohmic loss of silicon-based solar cells is still low.

In this embodiment, a plurality of solar cells 110 are sequentially arranged in an overlapping manner along the first direction D1. The front surface 112 of one of the two neighbors of the plurality of solar cells 110 partially overlaps the back surface 114 of the other of the two neighbors of the plurality of solar cells 110 to form an overlapping region 150. For example, a portion of the front surface 112 of the solar cell sheet 110-1 overlaps a portion of the rear surface 114 of the solar cell sheet 110-2 to form an overlapping region 150-1. A portion of the front surface 112 of the solar cell sheet 110-2 overlaps a portion of the rear surface 114 of the solar cell sheet 110-3 to form an overlapping region 150-2. In this embodiment, when the plurality of solar cells 110 are arranged along the first direction D1, the angle between the normal direction of the front surface 112 of each of the plurality of solar cells 110 and the first direction D1 is not perpendicular (not shown) ). That is to say, the plurality of solar cells 110 are arranged obliquely with respect to the first direction D1.

In this embodiment, the front surface 112 of one of the two neighbors of the plurality of solar cells 110 and the back surface 114 of the other of the two neighbors of the plurality of solar cells 110 are in direct contact, such as line contact, in the overlapping area 150 Or face contact. For example, the front side 112 of the solar cell 110-1 and the rear side 114 of the solar cell 110-2 are in direct contact in the overlapping area 150-1. The front side 112 of the solar cell 110-2 and the rear side 114 of the solar cell 110-3 are in direct contact in the overlapping area 150-2. That is, two adjacent solar cell sheets 110 arranged in the first direction D1 are in contact with each other, and there is no gap between the two adjacent solar cell sheets 110. In this way, the plurality of solar cells 110 can be arranged closer, so the effective power generation area per unit area of the solar photovoltaic module can be improved, which helps to improve the photoelectric conversion efficiency of the solar photovoltaic module.

In this embodiment, the plurality of first connectors 120 are respectively disposed on the front surfaces 112 of the plurality of solar cells 110 and extend in a second direction D2 different from the first direction D1. The plurality of second connectors 130 are respectively disposed on the back surfaces 114 of the plurality of solar cells 110 and extend in a third direction (second direction D2) different from the first direction D1. In this embodiment, the first direction D1 is substantially perpendicular to the second direction D2. In this embodiment, the third direction and the second direction D2 are the same. In other embodiments, the third direction and the second direction D2 may be different directions, and the invention is not limited thereto.

In this embodiment, the orthographic projections of the plurality of first connectors 120 and the plurality of second connectors 130 on the plurality of solar cells 110 are alternately arranged. That is to say, the orthographic projection of the second connection member 130 of one of the two adjacent solar cell sheets 110 is located between the orthographic projections of the respective first connection members 120 of the two adjacent solar cell sheets 110. In this embodiment, when the number of the plurality of solar cells 110 is N, and the N solar cells 110 are sequentially arranged in the first direction D1, the first connection on the first solar cell 110-1 The distance between the orthographic projection of the piece 120 and the orthographic projection of the second connection piece 130 on the second solar cell sheet 110-2 is T1, and the positive projection of the first connection piece 120 on the second solar cell sheet 110-2 The distance between the projection and the orthographic projection of the second connector 130 on the third solar cell 110-3 is T2, where the distance T1 is the same as the distance T2, and so on, to the N-1 solar cell The distance between the orthographic projection of the first connector 120 on the 110 and the orthographic projection of the second connector 130 on the Nth solar cell 110 can be the same, however, the invention is not limited thereto. In other embodiments, those with ordinary knowledge in the art can adjust the distance according to actual needs.

In this embodiment, each solar cell 110 further includes side surfaces 116 and 118, wherein the side surfaces 116 are arranged in the second direction D2 and the side surfaces 118 are arranged in the first direction D1. In this embodiment, at least one third connecting member 140 is located beside the side 116 of the plurality of solar cells 110, extends along the side 116, and connects the first on one of the two adjacent ones of the plurality of solar cells 110 One end of the connection member 120 is connected to one end of the second connection member 130 on the other of two adjacent ones of the plurality of solar cells 110.

In this embodiment, the two third connectors 140 can be connected to opposite ends of the first connector 120 of one of the two adjacent solar cells 110 respectively, and the two third connectors 140 can be connected to the two The opposite ends of the second connecting member 130 on the other of the adjacent solar cells 110 form a closed circuit, and the orthographic projection of the closed circuit is a mouth shape. In this embodiment, each third connecting member 140 may also extend from the second direction D2 and connect with the corresponding first connecting member 120 and second connecting member 130 to form a gap d. That is, there is a gap d between each third connecting member 140 and the side surfaces 116 of the plurality of solar cells 110, wherein the gap d is between 0.1 mm and 3 mm. In this embodiment, the solar photovoltaic module 100A further includes an insulating layer 160, which covers the third connector 140 to electrically insulate the third connector 140 from the outside, so as to avoid the third connector 140 from each other Occasionally short circuit with the outside world.

In this embodiment, the materials of the plurality of first connectors 120, the plurality of second connectors 130, and the at least one third connector 140 may be copper strips, tinned copper strips, or other suitable metal materials. The materials of the plurality of first connectors 120, the plurality of second connectors 130, and the at least one third connector 140 may be the same material. However, the invention is not limited to this. In other embodiments, the materials of the plurality of first connectors 120, the plurality of second connectors 130, and the at least one third connector 140 may be different materials from each other. In this embodiment, the plurality of first connectors 120, the plurality of second connectors 130, and the at least one third connector 140 may be integrally formed.

In this way, a plurality of solar cells 110 are stacked on top of each other in the first direction D1, and the first connector 120 on one of the two adjacent solar cells 110 passes through the third connector 140 located beside the side 116 The second connector 130 on the other of the two adjacent solar cells 110 is electrically connected without passing through the overlapping area 150 between the two adjacent solar cells 110, which can reduce the number of solar cells 110 During the lamination process, the connection member may cause the solar cell 110 to break. In addition, since the third connector 140 is disposed beside the side 116, it does not affect the effective light receiving area, so that the electric energy generated by the light can be effectively transmitted to another adjacent solar cell through the third connector 140 located beside the side 116 In sheet 110, solar photovoltaic module 100A can still maintain good photoelectric conversion efficiency.

2A is a schematic top view of a solar photovoltaic module according to another embodiment of the invention. FIG. 2B is a schematic side view of the solar photovoltaic module according to FIG. 2A on a side adjacent to the section line II-II'. 2A and 2B, the solar photovoltaic module 100B in this embodiment is similar to the solar photovoltaic module 100A in FIGS. 1A and 1B. The difference between the solar photovoltaic module 100B and the solar photovoltaic module 100A will be described below Therefore, the same or similarities between the solar photovoltaic module 100B and the solar photovoltaic module 100A will not be repeated. In this embodiment, the first connecting member 120 of one of the two adjacent ones of the plurality of solar cells 110 is located in the overlapping area 150. That is, the first connecting member 120 on one of the two neighbors of the plurality of solar cells 110 is sandwiched between the two neighbors of the plurality of solar cells 110 (see FIG. 2B). In this way, the first connector 120 is not exposed to the illuminated area of the solar cell 110, which can increase the effective light receiving area and further improve the photoelectric conversion efficiency.

3A is a schematic top view of a solar photovoltaic module according to another embodiment of the invention. FIG. 3B is a schematic side view of the solar photovoltaic module according to FIG. 3A on a side adjacent to the section line III-III'. 3A and 3B, the solar photovoltaic module 100C in this embodiment is similar to the solar photovoltaic module 100A in FIGS. 1A and 1B. The difference between the solar photovoltaic module 100C and the solar photovoltaic module 100A will be described below Therefore, the same or similarities between the solar photovoltaic module 100C and the solar photovoltaic module 100A will not be repeated. In this embodiment, the other second connecting member 130 of the two adjacent ones of the plurality of solar cells 110 is located in the overlapping area 150. That is, the second connector 130 on the other of the two neighbors of the plurality of solar cells 110 is sandwiched between the two neighbors of the plurality of solar cells 110 (see FIG. 3B ). In this way, compared with the solar photovoltaic module 100A, the length of the third connecting member 140 can be reduced, thereby reducing the ohmic line resistance of the third connecting member 140, and improving the photoelectric conversion efficiency of the solar photovoltaic module 100C.

4A is a schematic top view of a solar photovoltaic module according to another embodiment of the present invention. FIG. 4B is a schematic side view of the solar photovoltaic module according to FIG. 4A on a side adjacent to the section line IV-IV'. 4A and 4B, the solar photovoltaic module 100D in this embodiment is similar to the solar photovoltaic module 100A in FIGS. 1A and 1B. The difference between the solar photovoltaic module 100D and the solar photovoltaic module 100A will be described below Therefore, the same or similarities between the solar photovoltaic module 100D and the solar photovoltaic module 100A will not be repeated. In this embodiment, one of the two neighbors of the plurality of solar cells 110 and the other of the two neighbors of the plurality of solar cells 110 are connected to each other, and the method of the front side 112 of the plurality of solar cells 110 The line direction is substantially perpendicular to the first direction D1. In this embodiment, the plurality of side surfaces 118 of the plurality of solar cells 110 are in contact with each other. In this embodiment, the plurality of front surfaces 112 of the plurality of solar cells 110 may be located substantially on the same plane, and the plurality of rear surfaces 114 of the plurality of solar cells 110 may be located substantially on the same plane (see FIG. 4B), However, the invention is not limited. In other embodiments, since the back surface 114 of the solar cell sheet 110 has the second connector 130, when the multiple solar cell sheets 110 are connected in series, it is easy to make the normal direction of the multiple front surfaces 112 of the multiple solar cell sheets 110 Are slightly different from each other, and the normal directions of the back surfaces 114 of the plurality of solar cells 110 are slightly different from each other, so that the front surfaces 112 of the plurality of solar cells 110 are not located on the same plane, and the plurality of solar cells 110 The multiple backs 114 are not on the same plane.

5A is a schematic top view of a solar photovoltaic module according to an embodiment of the invention. FIG. 5B is a schematic side view of the solar photovoltaic module according to FIG. 5A on a side near the cross-sectional line V-V'. 5A and 5B, the solar photovoltaic module 100E in this embodiment is similar to the solar photovoltaic module 100A in FIGS. 1A and 1B. The difference between the solar photovoltaic module 100E and the solar photovoltaic module 100A will be described below Therefore, the same or similarities between the solar photovoltaic module 100E and the solar photovoltaic module 100D will not be repeated. In this embodiment, the side surfaces 118 of a part of the plurality of solar cells 110 are in contact with each other, and the front surface 112 of one of the two neighbors of the other part of the plurality of solar cells 110 is in contact with the plurality of solar cells 110 The back surface 114 of the other of the two neighbors partially overlaps to form an overlapping area 150. For example, the side 118 of the solar cell 110-1 and the side 118 of the solar cell 110-2 are connected to each other. On the other hand, the front surface 112 of the solar cell sheet 110-2 partially overlaps the rear surface 114 of the solar cell sheet 110-3 to form an overlapping region 150. The stacking relationship between the plurality of solar cells 110 of the present invention is not limited to the stacking relationship of the solar cell modules 100E. Those skilled in the art can adjust the two solar cells 110 adjacent to each other according to actual conditions and needs The side 118 is connected, or the two adjacent solar cells 110 have a ratio of one front side 112 overlapping with the other back side 114, which is not limited in the present invention.

6 is a schematic top view of a solar cell sheet according to an embodiment of the invention. Please refer to FIG. 6. In this embodiment, each solar cell 110 includes a plurality of first finger electrode lines 174 and a first bus bar 172 on the front surface 112. The first bus bar 172 extends in the second direction D2 , The plurality of first finger electrode wires 174 are electrically connected to the first bus bar 172, and the orthographic projections of the plurality of first finger electrode wires 174 extend in the first direction D1, and the first connector 120 and the solar cell The first bus bar 172 of 110 is electrically connected. In this embodiment, each solar cell 110 may include more than one first bus bar 172, and the orthographic projections of the plurality of first bus bars 172 are arranged along the first direction D1. In this embodiment, the first connector 120 covers the first bus bar 172. However, the present invention is not limited to this. In other embodiments, the solar cell 110 may not include the first bus bar 172, and the plurality of first finger electrode wires 174 are in direct contact with the first connector 120 and are electrically connected. The solar cell 110 in this embodiment is one of the multiple solar cells 110 in any of the above embodiments. That is to say, in the embodiment of FIGS. 1A to 5B, the drawing of the first finger electrode line 174 and at least one first bus bar 172 on the solar cell 110 of FIG. 6 is omitted.

In the embodiment shown in FIGS. 1A to 5B, the back surface 114 of each solar cell 110 may further include a plurality of second finger electrode lines (not shown) and second bus bars (not shown), the second The bus bar extends in the third direction (second direction D2), a plurality of second finger electrode wires are electrically connected to the second bus bar, and the orthographic projections of the plurality of second finger electrode wires are in the first direction D1 Extending, the second connector 130 is electrically connected to the second busbar of the solar cell 110. In other embodiments, the solar cell 110 may not include the second bus bar, and the plurality of second finger electrode wires are directly in contact with and electrically connected to the second connector 130.

In summary, in the solar photovoltaic module according to the embodiment of the present invention, since the third connector is located beside the side of the solar cell, the first connector on one of the adjacent solar cells can pass through the third The connecting piece is connected to the second connecting piece on the other of the adjacent solar cells, and the connecting piece does not need to pass through the overlapping area between two adjacent solar cells, which can reduce the number of solar cells in the lamination process In the meantime, the connection piece poses a risk of solar cell rupture. In addition, the third connector is disposed beside the side and does not affect the effective light receiving area, so that the electric energy generated by the light can be effectively transmitted to the adjacent another solar cell via the third connector located on the side. Compared with other types of laminated solar photovoltaic modules, the first busbars are located on the front side of the solar cell near the long side, resulting in a higher ohmic resistance of the first finger electrode line, and the embodiment of the present invention In the solar cell, since the first bus bar can be located in the middle of the first finger electrode line, the ohmic resistance of the first finger electrode line can be effectively reduced, so that the solar photovoltaic module of the present invention can improve the photoelectric conversion effectiveness. As a hybrid type of the foregoing embodiment: most of the adjacent solar cells are arranged in the middle in a stacked arrangement, and a small number of solar cells are arranged in close proximity to each other without gaps on both sides. When the solar cells in the lamination layout area need to be replaced by rework due to defects, this interleaved arrangement of part of the solar cells and part of the zero gap will reduce the impact of the rework steps on the remaining normal solar cells.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100A, 100B, 100C, 100D, 100E: electronic devices 110, 110-1, 110-2, 110-3: solar cells 112: positive 114: back 116, 118: side 120: First connector 130: second connector 140: third connector 150, 150-1, 150-2: overlapping area 160: insulating layer 172: First bus 174: First finger electrode wire D1: First direction D2: Second direction d: clearance I-I’, II-II’, III-III’, IV-IV’, V-V’: section line T1, T2: distance

FIG. 1A is a schematic top view of a solar photovoltaic module according to an embodiment of the invention. FIG. 1B is a schematic side view of the solar photovoltaic module according to FIG. 1A on a side adjacent to the section line I-I'. 2A is a schematic top view of a solar photovoltaic module according to another embodiment of the invention. FIG. 2B is a schematic side view of the solar photovoltaic module according to FIG. 2A on a side adjacent to the section line II-II'. 3A is a schematic top view of a solar photovoltaic module according to another embodiment of the invention. FIG. 3B is a schematic side view of the solar photovoltaic module according to FIG. 3A on a side adjacent to the section line III-III'. 4A is a schematic top view of a solar photovoltaic module according to another embodiment of the present invention. FIG. 4B is a schematic side view of the solar photovoltaic module according to FIG. 4A on a side adjacent to the section line IV-IV'. 5A is a schematic top view of a solar photovoltaic module according to an embodiment of the invention. FIG. 5B is a schematic side view of the solar photovoltaic module according to FIG. 5A on a side near the cross-sectional line V-V'. 6 is a schematic top view of a solar cell sheet according to an embodiment of the invention.

100A: Solar photovoltaic module

110, 110-1, 110-2, 110-3: solar cells

116, 118: side

120: First connector

130: second connector

140: third connector

150, 150-1, 150-2: overlapping area

160: insulating layer

D1: First direction

D2: Second direction

d: clearance

I-I’: section line

T1, T2: distance

Claims (14)

A solar photovoltaic module, including: Multiple solar cells arranged in a first direction; A plurality of first connecting members are respectively disposed on the front surfaces of the solar cells, wherein the first connecting members extend in a second direction different from the first direction; A plurality of second connectors are respectively disposed on the back of the solar cells, wherein the second connectors extend upward from a third party different from the first direction; At least one third connecting member located beside the sides of the solar cells, extending along the side, and connecting one end of the first connecting member on one of the two neighbors of the solar cells to the solar cells One end of the second connector on the other of the two neighbors. The solar photovoltaic module as described in item 1 of the patent application scope, wherein the front surface of each of the solar cells includes a plurality of first finger electrode wires and at least one first bus bar, the at least one first The bus bar extends in the second direction, the first finger electrode wires are electrically connected to the at least one first bus bar, and the orthographic projections of the first finger electrode wires extend in the first direction, Each of the first connectors is electrically connected to the at least one first busbar of each of the solar cells. The solar photovoltaic module as described in item 1 of the patent application range, wherein the solar cells are arranged in an overlapping manner along the first direction, the front face of the two neighbors of the solar cells and the solar energy The back surfaces of the two adjacent ones of the battery slices partially overlap to form an overlapping area. The solar photovoltaic module as described in item 3 of the patent application scope, wherein the front face of the one of the two neighbors of the solar cells and the other of the two neighbors of the solar cells The back surface is in direct contact with the overlapping area. The solar photovoltaic module as described in item 3 of the patent application range, wherein the first connecting piece of the two adjacent ones of the solar cells is located in the overlapping area. The solar photovoltaic module as described in item 5 of the patent application range, wherein the first connecting member on the one of the two adjacent ones of the solar cells is sandwiched between the two adjacent ones of the solar cells Between those. The solar photovoltaic module as described in item 3 of the patent application scope, wherein the second connecting piece of the two adjacent ones of the solar cells is located in the overlapping area. The solar photovoltaic module as described in item 7 of the patent application scope, wherein the second connecting member on the other of the two neighbors of the solar cells is sandwiched between the two phases of the solar cells Between neighbors. According to the solar photovoltaic module described in item 1 of the patent application scope, the at least one third connecting member is a plurality of third connecting members, and the third connecting members are respectively connected to the two adjacent ones of the solar cells The two ends of the first connector on the one, and the two ends of the second connector connected to the two neighbors of the solar cells to form a closed circuit. For the solar photovoltaic module described in item 9 of the patent application scope, the orthographic projection of the closed circuit is a mouth shape The solar photovoltaic module as recited in item 1 of the patent application scope, wherein there is a gap between the at least one third connecting member and the side surfaces of the solar cells. The solar photovoltaic module as described in item 4 of the patent application scope, wherein the solar cells are arranged obliquely. The solar photovoltaic module as described in item 1 of the patent application range, wherein the one of the two neighbors of the solar cells and the other of the two neighbors of the solar cells are in contact with each other. The solar photovoltaic module as described in item 1 of the patent application scope further includes an insulating layer covering the at least one third connecting member.

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