CN211980625U

CN211980625U - Solar cell piece and photovoltaic module of grid breakage prevention

Info

Publication number: CN211980625U
Application number: CN202020719887.0U
Authority: CN
Inventors: 严栋
Original assignee: Suzhou Talesun Solar Technologies Co Ltd
Current assignee: Shandong Tenghui New Energy Technology Co.,Ltd.; Suzhou Talesun Solar Technologies Co Ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-11-20
Anticipated expiration: 2030-05-06

Abstract

The utility model discloses a prevent solar wafer and photovoltaic module of disconnected bars. A solar cell piece with a grid breakage prevention function comprises a substrate and an electrode formed on the substrate, wherein the electrode comprises a plurality of main grid lines and a plurality of fine grid lines, each main grid line respectively comprises a body and two groups of auxiliary main grids, the body is provided with a head part connected with a starting part of a welding strip and a tail part connected with a ending part of the welding strip, the head part and/or the tail part are respectively connected with one group of auxiliary main grids, each group of auxiliary main grids respectively comprises at least two auxiliary main grids, the two auxiliary main grids are positioned on two sides of the head part or the tail part of the body, each auxiliary main grid respectively extends from the outer edge of the substrate to the middle part of the substrate and is connected with the head part or the tail part of the body, the distance between the junction bus point of the body and the auxiliary main grids and the outer edge of the substrate is larger than the distance between the tail end of the body and the outer edge of the substrate, each thin grid line is crossed and connected with the main body and/or the auxiliary main grid respectively. The grid breakage preventing solar cell can prevent the head and the tail of the main grid line from being disconnected with the thin grid line.

Description

Solar cell piece and photovoltaic module of grid breakage prevention

Technical Field

The utility model belongs to crystalline silicon solar wafer field relates to a solar wafer, especially a solar wafer who prevents disconnected bars and have its photovoltaic module.

Background

The existing battery piece screen printing plate in the high-efficiency solar battery piece industry is designed after the assembly end is welded, the welding strip head part and the welding strip tail part which cover the battery piece are easily separated from the end part of a main grid, so that the current of a thin grid line cannot be collected on the main grid, EL grid breakage is caused, the electrical property of the whole assembly can be influenced by the reduction of the current of the battery piece with serious grid breakage, and the power is reduced. This is mainly due to: the welding technology of the mainstream of the existing assembly welding machine is an infrared welding technology, the starting part and the ending part of the two ends of the main grid of the high-efficiency battery piece are welded together by an infrared lamp box after being covered with a tin-coated welding strip, the welding strip can be contacted with and welded with the silver paste of the starting part and the ending part of the main grid, after the battery string is carried by a string placing machine or manually adjusted, the battery string is vibrated, the welding strip is separated from the silver paste, the starting part and the ending part of the main grid are disconnected from the fine grid, and the broken grid is formed.

In a grid-connected power station, due to the fact that a grid is broken in a component, hot spot effect is easily generated, local heating is too high, the service life of the component is influenced, and the component is seriously burnt out.

SUMMERY OF THE UTILITY MODEL

To the above technical problem, the utility model aims at providing a prevent solar wafer of disconnected bars avoids the head and the tail of main grid line and thin grid line disconnection.

The utility model also provides a photovoltaic module can weaken or eliminate the local heating that arouses by disconnected bars.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a solar cell piece with a grid breakage prevention function comprises a substrate and an electrode formed on the substrate, wherein the electrode comprises a plurality of main grid lines and a plurality of fine grid lines, each main grid line respectively comprises a body and two groups of auxiliary main grids, the body is provided with a head part connected with a starting part of a welding strip and a tail part connected with a ending part of the welding strip, the head part and/or the tail part are respectively connected with one group of auxiliary main grids, each group of auxiliary main grids respectively comprises at least two auxiliary main grids, the two auxiliary main grids are positioned on two sides of the head part or the tail part of the body, each auxiliary main grid respectively extends from the outer edge of the substrate to the middle part of the substrate and is connected with the head part or the tail part of the body, the distance between the junction bus point of the body and the auxiliary main grids and the outer edge of the substrate is larger than the distance between the tail end of the body and the outer edge of the substrate, each thin grid line is crossed and connected with the main body and/or the auxiliary main grid respectively.

In one embodiment, each of the sub-main gates includes a first segment parallel to and not overlapping with the body and a second segment connected between the first segment and the head or tail of the body.

Preferably, the second segment is parallel to the thin grid line.

More preferably, the second segment overlaps one of the thin gate lines.

In one embodiment, two secondary main grids of each set of secondary main grids are symmetrical with respect to the corresponding body.

In one embodiment, the sub-main gate is a solid line having a width greater than that of the thin gate line.

More preferably, the width of the sub-main gate is smaller than the width of the body.

In one embodiment, the secondary primary grid comprises two or more thin solid lines juxtaposed to each other.

The utility model discloses still adopt following technical scheme:

a photovoltaic module comprises a plurality of solar cells and a solder strip for interconnecting the plurality of solar cells, wherein the solar cells are as above, the head of the solder strip is welded with the head of the body of each main grid line of each cell, and the tail of the solder strip is welded with the tail of the body of each main grid line of each cell.

The utility model adopts the above scheme, compare prior art and have following advantage:

the utility model discloses a solar wafer sets up vice main grid in the body both sides of every main grid line, vice main grid final phase of a project and the body overlap joint of main grid line converge, vice main grid is collected through thin grid line to the electric current that cell piece marginal portion produced, collect by vice main grid and converge on the main grid line, no matter how the state of cell piece head-start and final phase of a project welding area and main grid line body is, can not produce disconnected bars phenomenon, the disconnected bars problem that drops off and cause after having solved main grid line head-start and final phase of a project silver thick liquid and tin-coated welding area welding, realize preventing disconnected bars mesh. Thereby reducing or eliminating local heating caused by grid break and achieving the purpose of ensuring the performance and power of the component.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a solar cell according to an embodiment of the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

Wherein, 1, a substrate; 1a, an outer edge; 2. a main gate line; 21. a body; 21a, a head; 21b, tail; 21c, end; 22. a secondary main grid; 221. a first stage; 222. a second stage; 23. connecting to a confluence point; 3. and a thin gate line.

Detailed Description

The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, enables the advantages and features of the invention to be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment provides a solar cell piece for preventing a grid from being broken. Referring to fig. 1, the solar cell of the anti-breaking grid comprises a substrate 1 and an electrode formed on the substrate 1. The substrate 1 is specifically a crystalline silicon substrate. In this embodiment, the electrode is specifically a front electrode. The electrode includes a plurality of main gate lines 2 and a plurality of fine gate lines 3. As shown in fig. 1, the whole of the bus bars 2 is printed on the substrate 1 in the longitudinal direction, and the fine bus bars 3 are printed on the substrate 1 in the transverse direction and in parallel with each other. Each main grid line 2 includes a main body 21 and two sets of auxiliary main grids, and the main body 21 has a head portion 21a for connecting with a leading portion (leading solder strip) of a solder strip and a tail portion 21b for connecting with a trailing portion (trailing solder strip) of the solder strip. The head part 21a and/or the tail part 21b are respectively connected with a group of auxiliary main grids, each group of auxiliary main grids respectively comprises two auxiliary main grids 22, and the two auxiliary main grids 22 are positioned at two sides of the head part 21a or the tail part 21b of the body 21. Each secondary main grid 22 extends from the outer edge 1a of the substrate 1 to the middle of the substrate 1 and is connected with the head part 21a or the tail part 21b of the body 21, and the connection confluence point 23 of the body 21 and the secondary main grid 22 is farther from the outer edge 1a of the substrate 1 than the distance from the tail end 21c of the body 21 to the outer edge 1a of the substrate 1. The head portion 21a and the tail portion 21b each have one end 21c, and as shown in fig. 1, the end 21c of the head portion 21a is the uppermost end of the head portion 21a, and the end 21c of the tail portion 21b is the lowermost end of the tail portion 21 b.

As shown in fig. 2, the end 21c of the main body 21 is closer to the outer edge 1a of the substrate 1 than the junction point 23 of the main body 21 and the sub-main grid 22, and the sub-main grid 22 is converged to the main body 21 after passing inward over the end 21c of the main body 21. Each thin grid line 3 is respectively crossed and connected with the main body 21 and/or the auxiliary main grid 22, specifically, a plurality of thin grid lines 3 close to the outer edge 1a of the substrate 1 are crossed and connected with the auxiliary main grid 22, a plurality of thin grid lines 3 in the middle of the substrate 1 are crossed and connected with the main body 21, and a few thin grid lines 3 are crossed and connected with the main body 21 and the auxiliary main grid 22.

Specifically, each of the sub-main gates 22 includes a first section 221 parallel to and not overlapping with the body 21 and a second section 222 connected between the first section 221 and the head portion 21a or the tail portion 21b of the body 21, and the second section 222 is preferably parallel to the thin gate line 3, i.e. the first section 221 and the second section 222 of the sub-main gate 22 are perpendicular to each other. More preferably, the second segment 222 overlaps one of the thin gate lines 3, so that the thin gate line 3 and the auxiliary main gate 22 have a larger contact area, and the anti-breaking effect is better. The two sub-main grids 22 of each set of sub-main grids 22 are symmetrical with respect to the corresponding main body 21, and are mirror-symmetrical with the corresponding main body 21 as a symmetry axis.

In this embodiment, the sub-main gate 22 is a solid line having a width larger than that of the thin gate line 3, and preferably has a width smaller than that of the body 21 of the main gate line 2. In other embodiments, the sub-main gate 22 includes two or more thin solid lines juxtaposed to each other, and has a width equal to or close to the width of the thin gate line 3.

The embodiment also provides a photovoltaic module, which comprises a plurality of solar cells and solder strips for interconnecting the solar cells. The welding strip head part 21a is welded with the head part 21a of the body 21 of each main grid line 2 of each battery piece, and the welding strip tail part 21b is welded with the tail part 21b of the body 21 of each main grid line 2 of each battery piece.

In this embodiment, set up vice main grid 22 in the body 21 both sides of every main grid line 2, vice main grid 22 final phase of a project and the body 21 overlap joint of main grid line 2 converge, the electric current that the battery piece marginal portion produced collects vice main grid 22 through thin grid line 3, collect by vice main grid 22 and converge on main grid line 2, no matter how the state of battery piece beginning and final phase of a project welding strip and main grid line 2 body 21, can not produce disconnected bars phenomenon, the disconnected bars problem that the welding back of main grid line 2 beginning and final phase of a project silver thick liquid and tin-coated welding strip breaks away from and causes has been solved, realize preventing disconnected bars mesh. Thereby reducing or eliminating local heating caused by grid break and achieving the purpose of ensuring the performance and power of the component.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are preferred embodiments, which are intended to enable persons skilled in the art to understand the contents of the present invention and to implement the present invention, and thus, the protection scope of the present invention cannot be limited thereby. All equivalent changes or modifications made according to the principles of the present invention are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a solar wafer of grid breakage prevention, includes the substrate and forms the electrode on the substrate, the electrode includes a plurality of main grid lines and a plurality of thin grid line, its characterized in that: each main grid line comprises a body and two groups of auxiliary main grids, the body is provided with a head part used for being connected with a welding strip head starting part and a tail part used for being connected with a welding strip tail ending part, the head part and/or the tail part are/is respectively connected with one group of auxiliary main grids, each group of auxiliary main grids respectively comprises at least two auxiliary main grids, the two auxiliary main grids are positioned at two sides of the head part or the tail part of the body, each auxiliary main grid respectively extends from the outer edge of the substrate to the middle part of the substrate and is connected with the head part or the tail part of the body, the distance from the connection confluence point of the body and the auxiliary main grids to the outer edge of the substrate is larger than the distance from the tail end of the body to the outer edge of the substrate, and each fine grid line is respectively connected with the body and/or the auxiliary main grids in a crossing mode.

2. The solar cell sheet according to claim 1, wherein: each auxiliary main grid comprises a first section which is parallel to the body and is not overlapped with the body and a second section which is connected between the first section and the head or tail of the body.

3. The solar cell sheet according to claim 2, wherein: the second section is parallel to the thin grid line.

4. The solar cell sheet according to claim 3, wherein: the second segment overlaps one of the thin gate lines.

5. The solar cell sheet according to claim 1, wherein: and the two auxiliary main grids of each group of auxiliary main grids are symmetrical relative to the corresponding main body.

6. The solar cell sheet according to claim 1, wherein: the auxiliary main grid is a solid line with the width larger than that of the thin grid line.

7. The solar cell sheet according to claim 6, wherein: the width of the auxiliary main grid is smaller than that of the body.

8. The solar cell sheet according to claim 1, wherein: the auxiliary main grid comprises two or more thin solid lines which are mutually parallel.

9. A photovoltaic module comprises a plurality of solar cells and solder strips for interconnecting the cells, and is characterized in that: the solar cell is as set forth in any one of claims 1 to 8, a solder strip leading portion is soldered to a head portion of the main body of each main grid line of each cell, and a solder strip trailing portion is soldered to a tail portion of the main body of each main grid line of each cell.