CN211629122U

CN211629122U - Double-sided solar cell

Info

Publication number: CN211629122U
Application number: CN202020113003.7U
Authority: CN
Inventors: 张欣; 林纲正; 陈刚
Original assignee: Zhejiang Aiko Solar Energy Technology Co Ltd
Current assignee: Zhejiang Aiko Solar Energy Technology Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-10-02
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a double-sided solar cell, which comprises a cell body and a grid line group, wherein the grid line group is arranged on the back surface of the cell body; the grid line group comprises main aluminum grids and fine aluminum grids, the fine aluminum grids are connected between the main aluminum grids, each main aluminum grid comprises wide grid sections, electrode sections and fine grid sections, the wide grid sections are located at two ends of each main aluminum grid, and the fine grid sections are connected between the electrode sections; the width of the grid line of the wide grid section is larger than that of the thin grid section. Adopt the utility model discloses, can shorten the collection distance of main bars both ends current carrier, reduce subassembly EL dark line, the shading area is low moreover, and the photic rate is high, can improve the generating efficiency at the back to manufacturing cost has been reduced.

Description

Double-sided solar cell

Technical Field

The utility model relates to a solar cell technical field especially relates to a two-sided solar wafer.

Background

The PERC (passivated emitter and back contact) technology is the most cost-effective efficiency improvement means of crystalline silicon solar cells in recent years, and crystalline silicon PERC cells have occupied more than 50% of the market of crystalline silicon solar cells at present. With the increasing release of PERC capacity, the production cost of enterprises rises and the profit margin falls. The crystalline silicon PERC multi-main-gate battery can improve the conversion efficiency of the battery and reduce the consumption of silver paste, and becomes a main battery route for 5-10 years in the future.

The PERC double-sided battery only slightly changes the battery structure, and the conversion efficiency and the cost are equivalent to those of the PERC single-sided battery, which is the future development trend of the PERC component. The partial aluminum grid lines are used on the back of the PERC double-sided multi-main-grid battery, the front conversion efficiency equivalent to that of a single-sided battery is obtained, but the back efficiency is generally below 15%, and the application prospect of the battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a two-sided solar wafer is provided, the collection distance of the main grid both ends current carrier can be shortened, reduce subassembly EL dark line, and the shading area is low moreover, and the photic rate is high, can improve the generating efficiency at the back to manufacturing cost has been reduced.

In order to solve the technical problem, the utility model provides a double-sided solar cell, which comprises a cell body and a grid line group, wherein the grid line group is arranged on the back surface of the cell body;

the grid line group comprises main aluminum grids and fine aluminum grids, the fine aluminum grids are connected between the main aluminum grids, each main aluminum grid comprises wide grid sections, electrode sections and fine grid sections, the wide grid sections are located at two ends of each main aluminum grid, and the fine grid sections are connected between the electrode sections;

the width of the grid line of the wide grid section is larger than that of the thin grid section.

As an improvement of the scheme, the aluminum fine grid and the aluminum main grid are arranged perpendicularly to each other.

As an improvement of the above scheme, a blank space for separating adjacent gate line groups is provided between the gate line groups.

As an improvement of the scheme, the width of the grid line of the wide grid section is 1.2-3.5 mm.

As an improvement of the scheme, the width of the grid line of the electrode section is 1.5-3.5 mm.

As an improvement of the scheme, the width of the grid line of the thin grid section is 0.5-2.5 mm.

As an improvement of the scheme, the width of the grid line of the aluminum fine grid is 80-250 μm.

As an improvement of the scheme, the grid line group is provided with 5-12 aluminum main grids.

As an improvement of the scheme, the grid line groups are symmetrically arranged at the upper end and the lower end of the back surface of the cell body.

Implement the utility model discloses, following beneficial effect has:

the utility model discloses a double-sided solar cell, which comprises a cell body and a grid line group, wherein the grid line group is arranged on the back surface of the cell body;

the grid line group comprises main aluminum grids and fine aluminum grids, the fine aluminum grids are connected between the main aluminum grids, each main aluminum grid comprises wide grid sections, electrode sections and fine grid sections, the wide grid sections are located at two ends of each main aluminum grid, and the fine grid sections are connected between the electrode sections; the width of the grid line of the wide grid section is larger than that of the thin grid section.

Therefore, the design of the wide grid section is widened to increase the collection probability of carriers at the two ends of the back surface of the double-sided cell. And meanwhile, the design of the fine grid section is narrowed, so that the whole shading area of the aluminum main grid can be reduced, and the uniformity of the large-size silicon wafer after diffusion is ensured.

In summary, the widened design of the wide gate segment can shorten the collection distance of carriers at two ends, and reduce the dark fringes of the component EL.

Moreover, by reducing the width of the thin grid sections between the electrode sections, the shading area can be greatly reduced, the light acceptance rate is increased, the back efficiency is improved, and the production cost is reduced.

Drawings

Fig. 1 is a perspective view of a double-sided solar cell of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the utility model provides a double-sided solar cell, which comprises a cell body 1 and a grid line group 2, wherein the grid line group 2 is symmetrically arranged at the upper end and the lower end of the back of the cell body 1;

the grid line group 2 comprises aluminum main grids 21 and aluminum fine grids 22, the aluminum fine grids 22 are connected between the aluminum main grids 21, each aluminum main grid 21 comprises a wide grid section 211, an electrode section 212 and a fine grid section 213, the wide grid sections 211 are located at two ends of each aluminum main grid 21, and the fine grid sections 213 are connected between the electrode sections 212; the gate line width of the wide gate segment 211 is greater than that of the thin gate segment 213.

Specifically, the wide gate segment 211, the electrode segment 212 and the thin gate segment 213 together form the aluminum main gate 21, and the gate line groups 2 are mutually independent circuits, so as to avoid the problem of local gate lines from affecting the efficiency of the whole cell. Meanwhile, in order to distinguish each gate line group 2 conveniently, a blank area 11 for separating adjacent gate line groups 2 is arranged between the gate line groups 2.

In order to reduce the production cost of the product under the condition of ensuring the back efficiency of the battery piece, the grid line width of the wide grid section 211 is preferably 1.2-3.5 mm; the grid line width of the electrode section 212 is preferably 1.5-3.5 mm; the grid line width of the thin grid section 213 is preferably 0.5-2.5 mm; the width of the grid line of the aluminum fine grid 22 is preferably 80-250 μm. The grid line group is provided with 5-12 aluminum main grids.

More preferably, the width of the gate line of the wide gate segment 211 is 3.0mm, the width of the gate line of the electrode segment 212 is 2.5mm, the width of the gate line of the thin gate segment 213 is 0.8mm, and the width of the gate line of the aluminum thin gate 22 is 100 μm. The grid line group is provided with 9 aluminum main grids.

Compared with the prior art, the utility model discloses changed the problem of current through main bars + aluminium fine grid, shading area is too big promptly, lower, the more problem of aluminium thick liquid consumption of back efficiency.

The position distribution and the width design of wide grid section 211 can effectively reduce the dark line of subassembly EL, simultaneously the design of thin grid section 213 can compensate the current general too wide problem of aluminium main grid, thereby is guaranteeing under the condition of the normal performance of aluminium main grid, reduce shading area, aluminium thick liquid consumption and manufacturing cost to and improve the efficiency of battery piece back.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. A double-sided solar cell is characterized by comprising a cell body and a grid line group, wherein the grid line group is arranged on the back of the cell body;

2. The bifacial solar cell of claim 1, wherein said aluminum fine grid and said aluminum main grid are disposed perpendicular to each other.

3. The bifacial solar cell of claim 1, wherein the grid line groups have a space between them separating adjacent grid line groups.

4. The bifacial solar cell of claim 1, wherein the wide gate segments have a gate line width of 1.2-3.5 mm.

5. The bifacial solar cell of claim 1, wherein the width of the grid lines of the electrode segments is from 1.5 mm to 3.5 mm.

6. The bifacial solar cell of claim 1, wherein the fine grid segments have a grid line width of 0.5-2.5 mm.

7. The bifacial solar cell of claim 1, wherein the aluminum fine grid has a grid line width of 80-250 μm.

8. The bifacial solar cell of claim 1, wherein the grid line group is provided with 5-12 aluminum main grids.

9. The bifacial solar cell of claim 1, wherein the grid line groups are symmetrically arranged at the upper and lower ends of the back surface of the cell body.