CN218333815U

CN218333815U - Back structure of solar cell

Info

Publication number: CN218333815U
Application number: CN202222187419.5U
Authority: CN
Inventors: 刘雄飞; 段波; 李军勇; 陶龙忠
Original assignee: Jiangsu Shenyang Photovoltaic Technology Co ltd
Current assignee: Jiangsu Shenyang Photovoltaic Technology Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-01-17
Anticipated expiration: 2032-08-19

Abstract

The utility model provides a solar cell back structure, including the figure structure that is located the battery piece back, the figure structure includes that regular spread sets up the main grid line at the battery piece back and with main grid line vertically vice grid line, its characterized in that: the main grid line is divided into a grid line part and an electrode part which are mutually staggered along the length direction of the main grid line, the grid line part comprises a pattern area and a printing area, aluminum paste is printed on the printing area, the pattern area is hollow, and the pattern area is arranged in the printing area in an elliptic regular manner. Through optimizing the structure of back main grid line, reach the unit consumption cost that reduces battery piece aluminium thick liquid, promote battery piece efficiency.

Description

Back structure of solar cell

Technical Field

The invention belongs to the field of solar cell manufacturing, and particularly relates to a back structure of a solar cell.

Background

The current world is in energy shortage and increasingly serious in environmental pollution, the environmental awareness of people is higher, the world demand for new energy is higher and higher, solar energy is regarded as clean renewable energy and is more and more emphasized by various social circles, the crystalline silicon solar cell has been generally popularized and applied along with the development of optoelectronic technologies of China, the PERC cell gradually replaces the traditional cell with the powerful advantage to become a mainstream product of a high-efficiency cell at present, the technology is more and more mature along with the more and more fierce competition of the photovoltaic industry, the efficiency is improved, the cost is reduced to become two main research directions for further development of the photovoltaic industry, in the manufacturing process of the cell, a large amount of slurry is consumed in the printing process, so the PERC cell can be optimized as a breakthrough, and the aluminum main grid on the back of the existing cell has the defects of shading and high slurry consumption, so that the back light receiving rate of the cell is influenced, the efficiency is reduced, and the cost is increased.

Disclosure of Invention

In view of above, the utility model provides a solar cell back structure optimizes through the structure to back main grid line, reaches the unit cost that reduces the battery piece aluminium thick liquid, promotes battery piece efficiency.

The specific technical scheme is as follows:

the utility model provides a solar cell back structure, is including the figure structure that is located the cell piece back, the figure structure includes that regular array sets up the main grid line and the vice grid line perpendicular with the main grid line at the cell piece back, its characterized in that: the main grid line is divided into a grid line part and an electrode part which are mutually staggered along the length direction of the main grid line, the grid line part comprises a pattern area and a printing area, aluminum paste is printed on the printing area, the pattern area is hollow, and the pattern area is arranged in the printing area in an elliptic regular mode.

Further, the pattern area occupies 1/3 of the area of the printing area.

Further, the pattern area is an array formed by two rows of ellipses.

Further, silver paste is printed on the electrode portion, and the width of the electrode portion is larger than that of the grid line portion.

Further, the grid line part is used as two ends of the main grid line along the length direction of the main grid line.

Furthermore, a central axis perpendicular to the main grid lines is used as a battery dividing line, and two grid line parts are directly connected on two sides of the dividing line.

The utility model discloses a solar cell back structure sets up the figure district in the grid line portion on the main grid line, does not carry out the printing of aluminium thick liquid to the figure district to save the use of aluminium thick liquid, reduced the unit consumption cost, the figure district that has 1/3 on the grid line portion simultaneously and has also reduced the shading area of thick liquids, thereby has just also promoted the conversion efficiency of battery piece.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows the structure schematic diagram of the back of the solar cell of the present invention:

FIG. 2 is an enlarged view of a gate line portion A of FIG. 1;

the solar cell comprises a cell piece, a grid line part, an electrode part, a printing area, a graphic area, a grid line part and a grid line part, wherein the cell piece comprises 1 part of the back surface of the cell piece, 2 parts of the main grid line, 21 parts of the grid line part, 22 parts of the electrode part, 210 parts of the printing area, 211 parts of the graphic area, 3 parts of auxiliary grid lines and 4 parts of dividing lines.

Detailed Description

The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1 and 2, the back structure of the solar cell of the present embodiment includes a pattern structure located on the back surface 1 of the cell, the pattern structure includes main gate lines 2 regularly arranged on the back surface 1 of the cell and sub-gate lines 3 perpendicular to the main gate lines 2, the main gate lines 2 are divided into gate line portions 21 and electrode portions 22, the gate line portions 21 and the electrode portions are staggered along the length direction of the main gate lines 2, the gate line portions 21 include pattern regions 211 and printing regions 210, the printing regions 210 are printed with aluminum paste, the pattern regions 211 are hollowed out, and the pattern regions 211 are regularly arranged in the printing regions 210 in an elliptical shape.

Further, the pattern area is a hollowed-out array formed by two rows of ellipses, and the total hollowed-out area of the pattern area 210 accounts for 1/3 of the area of the printing area. In order to ensure that the PI film of the printing screen does not fall off from the steel wire mesh during printing, the size of the oval hollow of the pattern area 210 is larger than the opening degree of the grid on the steel wire mesh, preferably, the oval long axis length of the pattern area 210 is 3mm, and the short axis length is 2mm.

In addition, silver paste is printed on the electrode portion 22, and the width of the electrode portion 22 is greater than that of the gate portion 21.

Preferably, the gate line portion 21 is used as two ends of the main gate line 2 along the length direction of the main gate line 2. The central axis perpendicular to the main grid lines 2 is used as a battery dividing line 4, and two grid line parts 21 are arranged on two sides of the dividing line 4 and are directly connected.

The following table shows the efficiency gains, with a 7 mg/tablet reduction in unit consumption and a 0.015% increase in efficiency.

DOE

Eta

Uoc

Isc

Rs

Rsh

FF

IREV2

Unit consumption

The utility model discloses battery experimental data average value

0.015

0.8mv

10mv

/

-0.10%

-0.004

7 mg/tablet

While specific embodiments of the invention have been described in detail with reference to exemplary embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. In particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention. Except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a solar cell back structure, is including the figure structure that is located the cell piece back, the figure structure includes that regular spread sets up the main grid line and the vice grid line perpendicular with the main grid line at the cell piece back, its characterized in that: the main grid line is divided into a grid line part and an electrode part which are mutually staggered along the length direction of the main grid line, the grid line part comprises a pattern area and a printing area, aluminum paste is printed on the printing area, the pattern area is hollow, and the pattern area is arranged in the printing area in an elliptic regular manner.

2. The solar cell backside structure of claim 1 wherein the patterned areas occupy 1/3 of the area of the printed area.

3. The solar cell backside structure of claim 1 or 2 wherein the patterned areas are in an array of two rows of ovals.

4. The solar cell backside structure of claim 1, wherein the electrode portion is printed with silver paste, and a width of the electrode portion is greater than a width of the gate line portion.

5. The solar cell backside structure of claim 1, wherein the grid line portions are provided as two ends of the main grid line along a length direction of the main grid line.

6. The solar cell back structure of claim 1, wherein a central axis perpendicular to the major grid lines is used as a cell dividing line, and two grid lines are directly connected on both sides of the dividing line.