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Solar cell, back electrode thereof and preparation method

A solar cell and back electrode technology, which is applied in the field of solar cells, can solve the problem that the bifacial rate of the carrier collection effect cannot meet the use requirements, etc., and achieve the effects of reducing the isolated collection blank area, improving the conversion efficiency, and improving the collection effect

Pending Publication Date: 2021-04-09
TONGWEI SOLAR ENERGY (CHENGDU) CO LID +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the collection effect of the back electrode on the carrier of the existing MBB double-sided battery and the bifacial rate of the battery cannot meet the use requirements, and still needs to be further improved. It provides a solar battery and its back surface. Electrode and Preparation Method

Method used

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  • Solar cell, back electrode thereof and preparation method
  • Solar cell, back electrode thereof and preparation method
  • Solar cell, back electrode thereof and preparation method

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Experimental program
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Effect test

Embodiment 1

[0046] to combine Figure 4-Figure 6 , the back electrode of the solar cell of this embodiment includes an aluminum main grid 9, an aluminum sub-grid 10 and a back silver electrode 11, and the aluminum main grid 9 is composed of ring-shaped aluminum main grids 9-2 distributed at intervals and connecting adjacent rings The through-type aluminum main grid 9-1 is composed of the ring-shaped aluminum main grid 9-2, and the back silver electrode 11 is located inside the ring-shaped aluminum main grid 9-2 and is electrically connected to it. The through-type aluminum main grid 9-1 is directly connected to the aluminum main grid 9-1-1 from the central area and directly connected to the aluminum main grid 9-1-2 from the peripheral area located on the upper side of the central area directly above the aluminum main grid 9-1-1. Composition, the height of the back silver electrode 11 corresponds to the height of the central area directly connected to the aluminum main grid 9-1-1, and its ...

Embodiment 2

[0065] to combine Figure 4-Figure 6, the structure of the back electrode of the solar cell of the present embodiment is basically the same as that of the embodiment 1, and the main difference is that in the present embodiment, the number of segments of the back silver electrode 11 corresponding to the same aluminum busbar 9 is 10, and a single back electrode The width W1 of the silver electrode 11 is 2.0 mm, the length H1 is 3.0 mm, the internal length H2 of the ring-shaped aluminum busbar is 3.4 mm, and its internal width W2 is 1.8 mm. The inner width W4 of the peripheral area directly connected to the aluminum main grid 9-1-2 is 1.2 mm, and the width W3 of the central area directly connected to the aluminum main grid 9-1-1 is 1.3 mm. The number of the aluminum main grids 9 is 9, and the aluminum sub-grids 10 are perpendicular to the aluminum main grids 9 and are evenly spaced, and the width is 110 μm, and the spacing is 1.106 mm.

[0066] The manufacturing method of the ba...

Embodiment 3

[0069] to combine Figure 4-Figure 6 , the structure of the back electrode of the solar cell of the present embodiment is basically the same as that of the embodiment 1, and the main difference is that the number of segments of the back silver electrode 11 corresponding to the same aluminum busbar 9 in the present embodiment is 20, and a single back electrode The width W1 of the silver electrode 11 is 1.4 mm, the length H1 is 1.9 mm, the inner length H2 of the ring-shaped aluminum busbar is 2.2 mm, and the inner width W2 is 1.3 mm. The inner width W4 of the peripheral area directly connected to the aluminum main grid 9-1-2 is 1.0 mm, and the width W3 of the central area directly connected to the aluminum main grid 9-1-1 is 0.9 mm. The number of the aluminum main grids 9 is 12, and the aluminum sub-grids 10 are perpendicular to the aluminum main grids 9 and are evenly spaced, and the width is 80 μm, and the spacing is 1.0 mm.

[0070] The manufacturing method of the back elect...

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Abstract

The invention discloses a solar cell, a back electrode thereof and a preparation method and belongs to the technical field of solar cells. The back electrode comprises aluminum main grids, aluminum auxiliary grids and back silver electrodes; each aluminum main grid is composed of annular aluminum main grids distributed at intervals and straight-through type aluminum main grids connected with the adjacent annular aluminum main grids; the back silver electrodes are located in the annular aluminum main grids and electrically connected with the annular aluminum main grids; and each straight-through type aluminum main grid is composed of a central area straight-through aluminum main grid and a peripheral area straight-through aluminum main grid located above the central area straight-through aluminum main grid. According to the solar cell, back electrode thereof and the preparation method of the invention, through the back electrode pattern design and the step-by-step printing process, the carrier collection effect of the back electrode can be greatly improved under the condition that the back shading area and the slurry consumption are not negatively influenced, so that the efficiency conversion efficiency of a battery piece is improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and more specifically relates to a solar cell, a back electrode and a preparation method thereof. Background technique [0002] Multi-Busbar (MBB, Multi-Busbar) and double-sided cell technology have become the mainstream technology of crystalline silicon cells and have been widely used. Among them, MBB technology realizes the reduction of the shading area and the substantial improvement of the current collection capacity through the increase of the number of busbars of the cell, the narrowing of the width of a single busbar, and the design of solder joints, thereby increasing the conversion efficiency of the battery by 0.3%. The unit consumption of pulp is also reduced by more than 10mg. Due to the advantages of double-sided battery technology, which can be produced with only a small amount of modification to the existing single-sided battery and module production lines, and can increase the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18
CPCH01L31/022433H01L31/022441H01L31/1804Y02E10/547Y02P70/50
Inventor 黄智夏伟冉东侯林均徐涛张林顾峰翟绪锦谢泰宏
Owner TONGWEI SOLAR ENERGY (CHENGDU) CO LID
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