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Solar cell unit, battery cell array, cell module and fabrication method of cell module

A technology of solar cells and solar cells, which is applied in the field of solar cells, can solve the problems of small conductive cross-sectional area and large resistance loss, and achieve the effects of high photoelectric conversion efficiency, low cost, and easy preparation

Active Publication Date: 2016-12-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the role of the ribbon, main grid and auxiliary grid is to conduct current. From the perspective of resistivity, the thinner the solder ribbon, main grid and auxiliary grid, the smaller the conductive cross-sectional area and the greater the resistance loss.

Method used

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  • Solar cell unit, battery cell array, cell module and fabrication method of cell module
  • Solar cell unit, battery cell array, cell module and fabrication method of cell module
  • Solar cell unit, battery cell array, cell module and fabrication method of cell module

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0140] During the preparation process of the solar cell module 100 , the conductive wire may be bonded or welded to the secondary grid line and the back electrode of the cell sheet 31 first, and then the various layers are stacked and laminated.

[0141] Other components of the solar cell assembly 100 according to the present application may be known in the art, and will not be repeated here.

[0142] Specifically, the solar cell module 100 includes an upper cover plate 10 , a front adhesive film layer 20 , a cell array 30 , a rear adhesive film layer 40 and a back sheet 50 . The battery slice array 30 includes a plurality of battery slices 31, and the adjacent battery slices 31 are connected by a plurality of conductive wires 32. The conductive wires 32 are formed by metal wires S extending back and forth between the surfaces of adjacent battery slices. The conductive wires 32 Welding with the auxiliary grid lines, the front adhesive film layer 20 is in direct contact with th...

example 1

[0167] Example 1 is used to illustrate an example of the solar cell module of the present application and its preparation method.

[0168] (1) Preparation of wire S

[0169] Attach a layer of Sn40%-Bi55%-Pb5% alloy layer (melting point is 125 ℃) on the surface of the copper wire, wherein the cross-sectional area of ​​the copper wire is 0.04mm 2 , the thickness of the alloy layer is 16 μm, thereby making a wire S.

[0170] (2) Preparation of solar cell module 100

[0171] Provide a POE film layer with a size of 1630×980×0.5mm (melting temperature is 65°C), and accordingly provide a glass plate with a size of 1633×985×3mm and 60 pieces of polycrystalline silicon cells with a size of 156×156×0.21mm piece. The battery sheet has 91 sub-grid lines (made of silver, 60 microns in width, and 9 microns in thickness), each sub-grid line basically runs through the cell in the longitudinal direction, and the distance between adjacent sub-grid lines is 1.7 mm, each auxiliary grid line i...

example 2

[0178] The solar cell module was prepared according to the method of Example 1, and the difference from Example 1 was that the length of the disconnected part in the length direction of the auxiliary grid line was 3 mm. Thus, a solar cell module A2 was produced.

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Abstract

The invention discloses a solar cell unit, a solar battery cell array, a solar cell module and a fabrication method of the solar cell module. The solar cell unit comprises a battery cell and a plurality of conductive wires, wherein the battery cell comprises a battery cell substrate and a plurality of auxiliary grid lines, the plurality of auxiliary grid lines are arranged on a front surface of the battery cell substrate, the plurality of conductive wires are arranged at intervals, intersect with the auxiliary grid lines and are connected with the auxiliary grid lines, at least one auxiliary grid line is provided with at least one disconnection part, and the disconnection part is arranged between adjacent conductive wires. In the solar cell unit according to the embodiment of the invention, the disconnection part is arranged on the at least one auxiliary grid line between adjacent conductive wires, namely, at least one auxiliary grid line between adjacent conductive wires is broken, the silver paste or other materials for fabricating the auxiliary grid lines are not needed to be printed at a disconnection position, thus, the usage amount of the materials for fabricating the auxiliary grid lines can be reduced, and the cost is reduced.

Description

technical field [0001] The present application relates to the field of solar cells, in particular to a solar cell unit, a solar cell array, a solar cell module and a preparation method thereof. Background technique [0002] Solar cell modules are one of the important components of solar power generation devices. Sunlight shines on the battery sheet from the front of the battery sheet. The battery sheet includes the battery sheet and the main grid line and the auxiliary grid line arranged on the front side of the battery sheet, and then draws the current through the welding strip welded on the main grid line. , main grid lines and auxiliary grid lines cover a part of the front side of the cell, thus blocking part of the sunlight, and the solar light energy shining on the solder strips, main grid lines and auxiliary grid lines cannot be converted into electrical energy. Therefore, soldering is required. The thinner the strips, busbars and sub-grids, the better. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/05H01L31/0224H01L31/18
CPCY02E10/50Y02P70/50
Inventor 赵志强姜占锋何龙
Owner BYD CO LTD