TW202008607A - Solar cell module - Google Patents

Abstract

A solar cell module structure includes a conductive connector including a first connection groove located in an upper portion of the conductive connector oriented toward a first direction, and a second connection groove located in a lower portion of the conductive connector oriented toward a second direction; a first solar cell unit inserted into the first connection groove at one end thereof and electrically connected to the conductive connector; and a second solar cell unit inserted at one end thereof into the second connection groove and electrically connected to the conductive connector. The conductive connector has an S-shaped or a serpentine sectional profile. The first direction and the second direction are opposite to each other.

Description

Solar cell module

The invention relates to the technical field of solar cells, and in particular to an improved solar cell module structure, which can increase the power generation of the module.

It is known that solar cells are p-type and n-type semiconductor materials joined to form positive and negative photoelectric elements. When the solar cells are exposed to sunlight, they will absorb solar energy to generate electrons and holes. Positive charges (Electric holes) and negative charges (electrons) will move in the positive (p-type) and negative (n-type) directions, respectively, generating DC current. This kind of photovoltaic element can convert light energy into electrical energy, so it is also called photovoltaic cell (PV).

Generally, the manufacturing method of the solar cell is to first clean and roughen the wafer surface, and then perform a diffusion process to form a phosphor glass layer and a doped emitter region on the wafer surface, and then use an etching process to remove the phosphor glass layer Then, the anti-reflection layer is formed, and then the electrode pattern is printed on the front and back of the battery with a metal paste screen using screen printing technology, and then sintered at high temperature to form an electrode. Finally, the batteries (such as 6x10 or 6x12 arrays) are arranged on the glass substrate, and then a stringer is connected, and the battery cells are serially connected into a solar module through a copper foil bonding wire (ribbon).

However, in the past, the solar battery modules need to be electrically connected to each other through the bus bar located next to the solar battery array and the interconnecting solder located between each solar battery unit. Therefore, a large separation distance needs to be reserved between each solar battery unit In other words, in the past, the design of solar cell modules could not contribute to a relatively high proportion of areas that forward electricity, so further improvements are needed.

The main purpose of the present invention is to provide an improved solar cell module, which adopts a laminated design, which can further increase the power generation of the module.

According to an embodiment of the present invention, there is provided a solar cell module structure including a conductive connection member, including a first connection groove at an upper portion of the conductive connection member, facing a first direction, and a second connection recess The groove is located at a lower portion of the conductive connection member, facing a second direction; a first solar cell, one end of which is inserted into the first connection groove and electrically connected to the conductive connection member; and a second solar energy One end of the battery unit is inserted into the second connection groove and electrically connected to the conductive connection member. Wherein the conductive connector has an S-shaped cross-sectional profile or a snake-shaped cross-sectional profile, and the first direction and the second direction are opposite directions to each other.

According to an embodiment of the present invention, the first connection groove has a first top surface, a first side surface and a first bottom surface, and the second connection groove has a second top surface and a second The side surface and a second bottom surface. An upper electrode located on an upper surface of the first solar cell is electrically connected to the first top surface through a first conductive member, and a lower electrode located on a bottom surface of the second solar cell It is electrically connected to the second bottom surface through a second conductive member.

The invention adopts the solar cell module structure of the lamination design, which connects the battery cells to each other in a tighter way through the conductive connection, the edges of the battery cells overlap slightly, so that there is no gap between the batteries, so in the same unit More batteries can be laid in the area, and the light absorption area is increased, which further improves the power generation of the module. In addition, through the connection of the conductive connectors, the two-dimensional array of battery cells can be realized. The battery modules are very flat after assembly and will not show a stepped drop. It is more convenient in packaging processing and the difficulty of packaging is reduced, so the process can be improved. Yield.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the preferred embodiments are described below in conjunction with the accompanying drawings, which are described in detail below. However, the following preferred embodiments and drawings are for reference and description only, and are not intended to limit the present invention.

In the following, the details will be explained with reference to the drawings, and the contents in these drawings also constitute a part of the detailed description of the specification, and are illustrated in a specific example description manner in which this embodiment can be implemented. The following examples have described enough details to enable those of ordinary skill in the art to implement them.

Of course, other embodiments can be adopted, or any structural, logical, and electrical changes can be made without departing from the embodiments described in the text. Therefore, the detailed description below should not be considered as a limitation, on the contrary, the embodiments contained therein will be defined by the scope of the attached patent application.

Please refer to FIG. 1, which is a schematic cross-sectional view of a solar cell module according to an embodiment of the invention. As shown in FIG. 1, the solar cell module 1 of the present invention includes a plurality of conductive connectors 100 having an S-shaped cross-sectional profile or a snake-shaped cross-sectional profile. To simplify the description, only three conductive connectors 100a, 100b, and 100c are shown in the first figure.

According to an embodiment of the present invention, each conductive connecting member 100 includes a first connecting groove 110 located at an upper portion 101 of each conductive connecting member 100, facing a first direction (for example, toward the left direction), and a second connecting groove 120 is located at the lower portion 103 of each conductive connector 100 and faces a second direction (for example, toward the right direction). The first direction and the second direction are opposite directions.

According to the embodiment of the present invention, the upper portion 101 and the lower portion 103 of each conductive connector 100 are connected via an intermediate connecting portion 102. According to an embodiment of the present invention, the body of the conductive connection member 100 may be an integrally formed structure made of the same material , for example, an integrally formed structure made of metal such as copper, aluminum, gold, or silver, but is not limited thereto. The surface of the conductive connection member 100 may also be subjected to surface treatment, for example, coating, polishing, or roughening, but is not limited thereto.

According to an embodiment of the present invention, the first connection groove 110 has a first top surface 110a, a first side surface 110b and a first bottom surface 110c, and the second connection groove 120 has a second top surface 120a and a first Two side surfaces 120b and a second bottom surface 120c.

The solar battery module 1 of the present invention includes a plurality of solar battery cells 200, which are connected in series through a plurality of conductive connectors 100 to form a battery string. To simplify the description, only the seven solar battery cells 200a to 200g are shown in the first figure.

According to an embodiment of the present invention, for example, one end of the solar cell 200a is inserted into the first connection groove 110 of the conductive connector 100a and electrically connected to the conductive connector 100a, and one end of the solar cell 200b is inserted into the conductive connector 100a The second connection groove 120, and is electrically connected to the conductive connector 100a. More specifically, an upper electrode 211 of an upper surface (or light-receiving surface) 210 of the solar cell 200a is electrically connected to the first top surface 110a of the first connection groove 110 via a conductive member 310, and is located The lower electrode 221 of a bottom surface 220 of the battery cell 200b is electrically connected to the second bottom surface 120c of the second connection groove 120 via a conductive member 320. The thickness of the conductive member 310 and the conductive member 320 are about 50 microns. The conductive members 310 and 320 may be made of copper or other suitable conductive materials.

According to an embodiment of the present invention, a conductive adhesive layer 410 may be further provided between the conductive member 310 and the first top surface 110a, and a conductive adhesive layer 420 may be further provided between the conductive member 320 and the second bottom surface 120c. For example, the conductive adhesive layers 410 and 420 may include silver adhesive or aluminum adhesive, but is not limited thereto.

An upper electrode 211 of the upper surface 210 of the solar cell 200b is connected to a conductive member 330, and a lower electrode 221 of the bottom surface 220 of the other solar cell 200c is connected to a conductive member 340, and the conductive member 330 and the conductive member The 340 is electrically connected together, for example, the conductive member 330 and the conductive member 340 can be electrically connected together by welding or with conductive adhesive (not shown). The thickness of the conductive member 330 and the conductive member 340 are about 50 microns. The conductive members 330 and 340 may be made of copper or other suitable conductive materials.

The other end of the solar cell 200c is inserted into the first connection groove 110 of the conductive connector 100b. Repeat the above connection configuration so that the solar cell 200c is serially connected to the solar cell 200d through the conductive connector 100b, and then continue to connect to For the solar battery cell 200e, the solar battery cell 200e is serially connected to the solar battery cell 200f through the conductive connector 100c, and then it is continuously connected to the solar battery cell 200g.

According to the embodiment of the present invention, the solar cell units 200a, 200c, 200e, and 200g are on the same horizontal plane, and the solar cell units 200b, 200d, and 200f are on the other horizontal plane. For example, in this embodiment, the solar cells The units 200a, 200c, 200e, and 200g are at a relatively high level, while the solar cell units 200b, 200d, and 200f are at a relatively low level. However, the difference between the two horizontal planes is very small, which is approximately equal to the thickness of the intermediate connection portion 102 of each conductive connection member 100, for example, approximately 100 microns.

Please refer to FIG. 2, which is a schematic cross-sectional view of a solar cell module according to another embodiment of the present invention, in which the same elements, regions, or material layers are still indicated by the same symbols. As shown in FIG. 2, the solar cell module 2 also includes a plurality of conductive connectors 100 having an S-shaped cross-sectional profile or a snake-shaped cross-sectional profile. In order to simplify the description, only the three conductive connectors 100a, 100b, and 100c are also shown in the second figure.

According to an embodiment of the present invention, each conductive connecting member 100 includes a first connecting groove 110 located at an upper portion 101 of each conductive connecting member 100, facing a first direction (for example, toward the left direction), and a second connecting groove 120 is located at the lower portion 103 of each conductive connector 100 and faces a second direction (for example, toward the right direction). The first direction and the second direction are opposite directions.

According to the embodiment of the present invention, the upper portion 101 and the lower portion 103 of each conductive connector 100 are connected via an intermediate connecting portion 102. According to an embodiment of the present invention, the body of the conductive connection member 100 may be an integrally formed structure made of the same material , for example, an integrally formed structure made of metal such as copper, aluminum, gold, or silver, but is not limited thereto. The surface of the conductive connection member 100 may also be subjected to surface treatment, for example, coating, polishing, or roughening, but is not limited thereto.

According to an embodiment of the present invention, the first connection groove 110 has a first top surface 110a, a first side surface 110b and a first bottom surface 110c, and the second connection groove 120 has a second top surface 120a and a first Two side surfaces 120b and a second bottom surface 120c.

According to an embodiment of the present invention, an insulating layer 510 is provided on at least the first side surface 110b and the first bottom surface 110c of the first connection groove 110, wherein the insulating layer 510 may also extend to the first top surface 110a or to A side wall of the conductive member 310. According to an embodiment of the present invention, an insulating layer 520 is provided on at least the second side surface 120b and the second top surface 120a of the second connection groove 120, wherein the insulating layer 520 may also extend to the second bottom surface 120c, or to A side wall of the conductive member 320. According to embodiments of the present invention, the insulating layer 510 and the insulating layer 520 may include silicon nitride, but not limited thereto.

According to the embodiment of the present invention, the outer surface of the conductive connecting member 100 is coated with an optical reflective film. For example, on the outer surface of the upper portion 101 of the conductive connector 100, including a top surface 101a and a side surface 101b, an optical reflective film 610 is provided. In addition, an optical reflective film 620 may be provided on the outer surface of the lower portion 103 of the conductive connector 100, including a bottom surface 103a and side surfaces 103b, wherein the optical reflective films 610, 620 may include nickel, copper, aluminum, silver, gold Or a combination of the above, or an alloy thereof. The outer surface of the conductive connector 100 is coated with optical reflective films 610 and 620, which can increase the incidence of light IL on the light-receiving surface of the solar cell and increase the cell efficiency.

The solar battery module structure 2 of the present invention also includes a plurality of solar battery cells 200, which are connected in series through a plurality of conductive connectors 100 to form a battery string. In order to simplify the description, only two solar battery cells 200a to 200g are shown in the second figure.

According to an embodiment of the present invention, for example, one end of the solar cell 200a is inserted into the first connection groove 110 of the conductive connector 100a and electrically connected to the conductive connector 100a, and one end of the solar cell 200b is inserted into the conductive connector 100a The second connection groove 120, and is electrically connected to the conductive connector 100a. More specifically, an upper electrode 211 of an upper surface (or light-receiving surface) 210 of the solar cell 200a is electrically connected to the first top surface 110a of the first connection groove 110 via a conductive member 310, and is located The lower electrode 221 of a bottom surface 220 of the battery cell 200b is electrically connected to the second bottom surface 120c of the second connection groove 120 via a conductive member 320.

According to the embodiment of the present invention, similarly, a conductive adhesive layer 410 may be further provided between the conductive member 310 and the first top surface 110a, and a conductive adhesive layer 420 may be further provided between the conductive member 320 and the second bottom surface 120c. For example, the conductive adhesive layers 410 and 420 may include silver adhesive or aluminum adhesive, but is not limited thereto.

An upper electrode 211 of the upper surface 210 of the solar cell 200b is connected to a conductive member 330, and a lower electrode 221 of the bottom surface 220 of the other solar cell 200c is connected to a conductive member 340, and the conductive member 330 and the conductive member The 340 is electrically connected together, for example, the conductive member 330 and the conductive member 340 can be electrically connected together by welding or with conductive adhesive. The other end of the solar cell 200c is inserted into the first connection groove 110 of the conductive connector 100b. Repeat the above connection configuration so that the solar cell 200c is serially connected to the solar cell 200d through the conductive connector 100b, and then continue to connect to For the solar battery cell 200e, the solar battery cell 200e is serially connected to the solar battery cell 200f through the conductive connector 100c, and then it is continuously connected to the solar battery cell 200g.

The solar cell module of the present invention adopts a lamination design. The battery cells are connected to each other in a tighter manner through conductive connectors. The edges of the battery cells overlap slightly so that there are no gaps between the batteries, so the same unit area More batteries can be laid in the middle, and the light absorption area is increased, which further improves the power generation of the module. Moreover, the two-dimensional array arrangement of the battery cells can be realized through the connection of the conductive connection parts, and the battery module will not show a stepped drop after assembly, which is more convenient in handling and can improve the yield of the process.

In addition, the solar battery module of the present invention adopts a lamination design to connect the battery cells to each other in a tighter manner through a conductive connection member, and no solder tape is required, which relatively saves the cost of the solder tape. The outer surface of the conductive connector is coated with an optical reflective film, which can increase the incidence of light on the light-receiving surface of the solar cell and increase the efficiency of the cell. The above are only the preferred embodiments of the present invention, and all changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

1, 2‧‧‧Solar battery module 100‧‧‧ conductive connector 100a, 100b, 100c‧‧‧ conductive connector 101‧‧‧ upper 101a‧‧‧top 101b‧‧‧side 102‧‧‧ intermediate connection Part 103‧‧‧Lower part 103a‧‧‧Bottom surface 103b‧‧‧Side side 110‧‧‧First connection groove 110a‧‧‧First top surface 110b‧‧‧First side surface 110c‧‧‧First bottom surface 120 ‧‧‧Second connection groove 120a‧‧‧Second top surface 120b‧‧‧‧Second side surface 120c‧‧‧Second bottom surface 200‧‧‧Solar battery unit 200a~200g‧‧‧Solar battery unit 210‧ ‧‧Upper surface 211‧‧‧Upper electrode 220‧‧‧Bottom surface 221‧‧‧Lower electrodes 310, 320, 330, 340‧‧‧ Conductive parts 410, 420‧‧‧ Conductive adhesive layer 510, 520‧‧‧ Insulation Layer 610, 620‧‧‧Optical reflective film IL‧‧‧Light

FIG. 1 is a schematic partial cross-sectional view of a solar cell module according to an embodiment of the invention. FIG. 2 is a schematic partial cross-sectional view of a solar cell module according to another embodiment of the invention.

1‧‧‧Solar battery module

100‧‧‧conductive connector

100a, 100b, 100c ‧‧‧ conductive connector

101‧‧‧Upper

102‧‧‧Intermediate connection

103‧‧‧Lower

110‧‧‧First connection groove

110a‧‧‧First top surface

110b‧‧‧First side surface

110c‧‧‧First bottom surface

120‧‧‧Second connection groove

120a‧‧‧Second top surface

120b‧‧‧Second side surface

120c‧‧‧Second bottom surface

200‧‧‧Solar battery unit

200a~200g‧‧‧Solar battery unit

210‧‧‧upper surface

211‧‧‧Upper electrode

220‧‧‧Bottom surface

221‧‧‧Lower electrode

310, 320, 330, 340

410, 420‧‧‧ conductive adhesive layer

Claims (15)

A solar cell module includes: a conductive connection member including a first connection groove located at an upper portion of the conductive connection member, facing a first direction, and a second connection groove located below the conductive connection member Part, facing a second direction; a first solar cell, one end of which is inserted into the first connection groove and electrically connected to the conductive connector; and a second solar cell, one end of which is inserted into the second connection recess Slot, and is electrically connected to the conductive connection piece. The solar cell module of claim 1, wherein the conductive connecting member has an S-shaped cross-sectional profile. The solar cell module of claim 1, wherein the conductive connecting member has a snake-shaped cross-sectional profile. The solar cell module of claim 1, wherein the first direction and the second direction are opposite directions to each other. The solar cell module of claim 1, the first connection groove has a first top surface, a first side surface and a first bottom surface, and the second connection groove has a second top surface, A second side surface and a second bottom surface. The solar cell module of claim 5, wherein an upper electrode located on an upper surface of the first solar cell is electrically connected to the first top surface via a first conductive member. The solar cell module of claim 6, wherein a first conductive adhesive layer is provided between the first conductive member and the first top surface. The solar cell module of claim 7, wherein the lower electrode on a bottom surface of the second solar cell is electrically connected to the second bottom surface via a second conductive member. The solar cell module of claim 8, wherein a second conductive adhesive layer is provided between the second conductive member and the second bottom surface. The solar cell module according to claim 9, wherein the first conductive adhesive layer and the second conductive adhesive layer include silver adhesive or aluminum adhesive. The solar cell module of claim 5, further comprising a first insulating layer, at least disposed on the first side surface and the first bottom surface. The solar cell module of claim 11, further comprising a second insulating layer, at least disposed on the second side surface and the second top surface. The solar cell module of claim 12, wherein the first insulating layer and the second insulating layer include silicon nitride. The solar cell module according to claim 1, wherein the outer surface of the conductive connection member is plated with an optical reflective film. The solar cell module according to claim 14, wherein the optical reflective film includes nickel, copper, aluminum, silver, gold, or a combination thereof, or an alloy thereof.

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