CN209896085U

CN209896085U - Solar cell, solar cell string and solar cell module

Info

Publication number: CN209896085U
Application number: CN201920540882.9U
Authority: CN
Inventors: 李明明; 冯均; 吕俊
Original assignee: Taizhou Longi Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2020-01-03
Anticipated expiration: 2029-04-19

Abstract

The application discloses solar wafer, solar cell cluster and solar module, wherein, solar wafer, including the base plate, at least the base plate is used for being provided with a plurality of solder strips side by side on the lapped side end face and passes through the groove. According to the scheme, when the solar battery pieces are connected in a laminated manner, the welding strip penetrates through the welding strip penetrating through groove, the two ends of the welding strip are respectively connected with the front surface component and the back surface component corresponding to the adjacent solar battery pieces to form the battery string, and the welding strip is located in the welding strip penetrating through groove, so that a gap does not exist at the lap joint of the two solar battery pieces, namely the coincident position, and the problem that the solar battery pieces are hidden or broken in the laminating process is solved.

Description

Solar cell, solar cell string and solar cell module

Technical Field

The utility model relates to a solar photovoltaic power generation technical field, concretely relates to solar wafer, solar cell cluster and solar module.

Background

With the rapid development of the photovoltaic industry, the demand for new products is increasing. At the present stage, the requirement of customers on the efficiency of the photovoltaic module is continuously improved, the space between the solar battery pieces in the photovoltaic module is eliminated, and the overlapping between the solar battery pieces gradually becomes a trend. As shown in fig. 1 to 3, in a conventional photovoltaic module, one end of a solder strip 2 is connected to a negative electrode of one solar cell 1, and the other end of the solder strip 2 is connected to a positive electrode of an adjacent solar cell 1, and after the solar cells 1 are laminated and welded, a gap formed by the thickness of the solder strip 2 exists between the two solar cells 1. In the laminating process, because a gap exists at the overlapping position of two solar battery pieces, the hidden crack rate and the breakage rate of the overlapping position are increased due to the pressure F in the laminating machine.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a solar cell, a solar cell string and a solar cell module, which are used for reducing the problem of hidden cracking or breaking of the solar cell.

In a first aspect, the utility model provides a solar cell piece, including the base plate, at least the base plate is used for being provided with a plurality of solder strip through grooves of passing side by side on the lapped side end face.

Further, the through groove for the welding strip to pass through is a rectangular groove, a diamond groove, a trapezoid groove, an arc groove or a horn mouth groove.

Furthermore, the depth of the welding strip passing through groove is 0.3mm-2 mm.

Further, the maximum width of the welding strip passing through groove is 0.8mm-3 mm.

In a second aspect, the present invention provides a solar cell string, which includes at least two of the above solar cells, wherein the solar cells are arranged in a tile-like manner;

the solar cell module is characterized by further comprising a solder strip penetrating through the solder strip penetrating through groove, one end of the solder strip is electrically connected with a front member of the solar cell piece positioned below, the other end of the solder strip is electrically connected with a back member of the solar cell piece positioned above, and the depth of the solder strip penetrating through groove is larger than the overlapping width of the two adjacent solar cell pieces.

Further, the front surface member is at least one of a front surface electrode, a front surface pad, and a front surface gate line.

Further, the back member is at least one of a back electrode, a back pad and a back gate line

Further, the maximum width of the welding strip passing through groove is larger than the width of the welding strip.

Further, the overlap width is 0.1mm to 1.5 mm.

In a third aspect, the present invention provides a solar cell module comprising a plurality of the above-mentioned solar cell strings.

According to the scheme, when the solar battery pieces are connected in a laminated manner, the welding strip penetrates through the welding strip penetrating through groove, the two ends of the welding strip are respectively connected with the front surface component and the back surface component corresponding to the adjacent solar battery pieces to form the battery string, and the welding strip is located in the welding strip penetrating through groove, so that a gap does not exist at the lap joint of the two solar battery pieces, namely the coincident position, and the problem that the solar battery pieces are hidden or broken in the laminating process is solved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a photovoltaic module according to the prior art;

FIG. 2 is an exploded view of a prior art solar cell interconnection;

FIG. 3 is a schematic diagram of a prior art solar cell lamination process;

fig. 4 is a top view of a solar cell provided in an embodiment of the present invention;

fig. 5 is a top view of a solar cell provided in another embodiment of the present invention;

fig. 6 is a top view of a solar cell provided in accordance with another embodiment of the present invention;

fig. 7 is a perspective view of a solar cell string according to an embodiment of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 4 and 5, the present invention provides a solar cell 1, including a substrate, a person skilled in the art can understand that the substrate herein refers to a component formed by processes such as texturing, diffusion, etching, depositing a passivation film and an antireflection film on a silicon substrate, and at least a plurality of solder strip through grooves 4 are arranged side by side on a side end face of the substrate for overlapping. The side for overlapping referred to herein means the side in the overlapping (overlapping) position in making a shingled connection.

The welding strip through groove 4 can be formed in one side of the substrate, and the welding strip through groove 4 can also be formed in two opposite sides of the substrate.

Fig. 4 shows three solar cells 1 arranged side by side, where each of the three solar cells 1 has a solder strip through groove 4 formed in one side thereof.

Fig. 5 shows three solar cells 1 arranged side by side, and the two opposite sides of each solar cell 1 are provided with solder strip through grooves 4.

Both sides that solar wafer 1 carried on the back mutually all set up and weld the area and walk through groove 4 for this solar wafer forms symmetrical structure, when carrying out the interconnection, can need not consider its direction of placing, is favorable to improving work efficiency. In addition, compared with the welding strip through groove 4 formed in one side, the welding strip through groove 4 formed in the two sides is arranged on the two sides, so that under the condition that the welding strip can pass through, the depth of the welding strip through groove 4 formed in the two sides can be shallow, the depth of the welding strip through groove 4 formed in the two sides is shallower, the damage to the solar cell piece in the grooving process is smaller, and the risks such as hidden cracks and fragments can be reduced when the welding strip through groove 4 is formed.

According to the scheme, when the solar battery pieces 1 are connected in a laminated manner, the welding strip penetrates through the welding strip penetrating through groove 4, the two ends of the welding strip are respectively connected with the front surface component and the back surface component corresponding to the adjacent solar battery pieces to form the battery string, and the welding strip is located in the welding strip penetrating through groove, so that a gap does not exist at the lap joint of the two solar battery pieces, namely the coincident position, and the problem that the solar battery pieces are hidden or broken in the laminating process is solved.

As an implementation mode, the size of the solar cell is larger than or equal to 125mm, the solar cell is a sub-cell which is formed by cutting a whole cell by half, one third, one fourth, one fifth or one sixth, and the number of main grid lines on the sub-cell is larger than or equal to 2.

Further, the through groove for the welding strip to pass through is a rectangular groove, a diamond groove, a trapezoid groove, an arc groove or a horn mouth groove. The welding strip passing through groove 4 shown in fig. 5 is a bell mouth groove. The solder strip through groove 4 can be formed during the production of the solar cell, and can also be formed by cutting through a slicing machine after the production of the solar cell. The welding strip that fig. 6 shows is walked through groove 4 and is the arc wall, and the pitch arc of arc wall can be minor arc, semicircle or major arc, preferred minor arc and semicircle, adopts the arc wall to compare in the groove of above-mentioned other structures, when slotting, only need carry out once cutting (for example the rectangular channel need cut the cubic, each limit need carry out laser cutting respectively promptly), can reduce the damage to the solar wafer of slotting, reduces the hidden danger of splitting, the piece that the slotting arouses. Fig. 6 only shows that an arc-shaped groove is formed on one side of the solar cell sheet 1, and of course, arc-shaped grooves may be formed on both opposite sides of the solar cell sheet 1.

Furthermore, the depth of the solder strip passing through the through groove 4 is 0.3mm-2mm, so that under the condition that the two solar battery pieces have enough overlapping width, part of the groove section is not covered by the overlapping part, and the solder strip can smoothly pass through the groove section. The depth referred to herein is in the downward direction of arrow H, from the perspective of fig. 4.

Furthermore, the maximum width of the welding strip passing through groove 4 is 0.8mm-3mm, so that the welding strip can smoothly pass through the welding strip passing through groove 4.

In a second aspect, as shown in fig. 7, the present invention provides a solar cell string, which includes at least two solar cells 1, wherein the solar cells 1 are arranged in a shingled manner; the solar cell module further comprises a solder strip 2 penetrating through the solder strip through groove 4, one end of the solder strip 2 is electrically connected with a front member of the solar cell 1 positioned below, the other end of the solder strip is electrically connected with a back member of the solar cell 1 positioned above, and the depth of the solder strip through groove 4 is larger than the overlapping width of two adjacent solar cell 1.

In this embodiment of the solar cell string, the solar cell sheet 1 of the above embodiment is adopted, and the effects thereof are referred to the above embodiment and are not described herein again.

Further, the front surface member is at least one of a front surface electrode, a front surface pad, and a front surface gate line. Generally, the front surface member serves as a negative electrode of the solar cell sheet 1.

Further, the back member is at least one of a back electrode, a back pad, and a back gate line. Generally, the back surface member serves as a positive electrode of the solar cell sheet 1.

The front surface referred to herein is a surface of the solar cell sheet 1 facing the sun when in use, and the back surface is a surface facing away from the sun.

Further, the maximum width of the solder strip passing through groove 4 is larger than the width of the solder strip, so that the solder strip 2 can conveniently pass through the solder strip passing through groove 4.

Furthermore, the overlapping width is 0.1mm-1.5mm, and by adopting the overlapping width, better connection can be realized, and the problem of efficiency reduction caused by overlarge covered area of the adjacent solar cell pieces 1 can be solved.

In a third aspect, the present invention provides a solar cell module comprising a plurality of the above-mentioned solar cell strings. Specifically, the solar cell module may include a frame, and a plurality of the above-described solar cell strings are arranged side by side in the frame.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of features described above or equivalents thereof without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The solar cell piece comprises a substrate and is characterized in that a plurality of welding strip through grooves are formed in the side-by-side mode on the end face, used for being lapped, of one side of the substrate.

2. The solar cell piece according to claim 1, wherein the solder strip passing through groove is a rectangular groove, a diamond groove, a trapezoidal groove, an arc groove or a flared groove.

3. The solar cell sheet according to claim 1 or 2, wherein the solder strip passing through groove has a depth of 0.3mm to 2 mm.

4. The solar cell sheet according to claim 3, wherein the solder strip passing through groove has a maximum width of 0.8mm to 3 mm.

5. A solar cell string, comprising at least two solar cells of any one of claims 1-4, wherein the solar cells are arranged in a shingled manner;

6. The solar cell string according to claim 5, wherein the front side member is at least one of a front side electrode, a front side pad, and a front side grid line.

7. The solar cell string according to claim 5 or 6, wherein the back side member is at least one of a back side electrode, a back side pad, and a back side grid line.

8. The solar cell string according to claim 5 or 6, wherein the maximum width of the solder strip passing through slot is greater than the width of the solder strip.

9. The string of solar cells according to claim 5 or 6, wherein the overlap width is 0.1mm-1.5 mm.

10. A solar cell module comprising a plurality of solar cell strings according to any one of claims 5 to 9.