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Method for packaging double-faced crystalline silicon heterojunction main-grid-free solar cell piece

A technology of solar cell sheet and packaging method, which is applied in the direction of circuits, photovoltaic power generation, electrical components, etc., and can solve the problems of poor weldability of batteries and reduce the amount of silver paste used

Inactive Publication Date: 2017-06-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a double-sided crystalline silicon heterojunction busbar-free solar cell packaging method SHJSHJ. The invention changes the SHJSHJ cell packaging process, greatly reduces the amount of silver paste, and at the same time no longer has high requirements for silver paste, reducing production costs. And solve the problem of poor battery weldability

Method used

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  • Method for packaging double-faced crystalline silicon heterojunction main-grid-free solar cell piece
  • Method for packaging double-faced crystalline silicon heterojunction main-grid-free solar cell piece
  • Method for packaging double-faced crystalline silicon heterojunction main-grid-free solar cell piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The silver paste with a silver content of 90% was printed on the battery sheet through a single screen printing process, and then thermally cured at 200° C. to prepare fine grid lines. Copper wires are then laid in a direction perpendicular to the fine grid lines. Through the transfer printing process, the copper wire is fixed on the battery sheet. In the transfer printing method, the acrylic resin type thermal pressure-sensitive adhesive is pre-loaded on the front of the release paper, and the width of the coated glue is 1.5 times the diameter of the copper wire. The back of the release paper is as follows: image 3 As shown, there are reference lines for easy alignment. The reference line can be the width position of the cell, the position of the starting copper wire, the position of the ending copper wire, the width position of the machine, etc., and it is designed according to the actual positioning method. The adhesive release paper is in the form of a roll, whic...

Embodiment 2

[0047]The silver paste with a silver content of 80% is printed on the battery sheet by a single screen printing process, and then thermally cured at 200°C to make a fine grid line, and then continue to pass the screen printing process at the point in contact with the copper wire Print a circular contact point with low-solid conductive silver paste, and the diameter of the contact point is slightly larger than or equal to the diameter of the copper wire. The paste used is low-solid conductive paste. After printing, copper is laid

[0048] Use equipment with a smooth surface and good thermal conductivity to hot press the copper wire and battery sheet at 200°C to solidify the silver paste.

[0049] Table 1 The material parameters and test results of a single SHJ cell are compared in the following table:

[0050]

[0051] Table 2 The comparison of the electrical performance test results of SHJ battery components is shown in the following table:

[0052] Program Vo...

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Abstract

The invention relates to a packaging method for a double-sided HIT busbar-free battery sheet, which mainly includes: laying a 10-80 μm-diameter plated battery on a self-made or outsourced busbar-free HIT battery sheet with once-printed thin grid lines. Copper wire with metal anti-oxidation layer; when the height of the thin grid wire is greater than the diameter of the copper wire, first lay the copper wire in the direction perpendicular to the thin grid wire, and the contact point between the copper wire and the grid wire is a node, and the heat and pressure sensitive After the glue or photosensitive glue is covered on the copper wire and the battery sheet along the direction of the copper wire, the colloid is cured; when the height of the thin grid line is less than or equal to the diameter of the copper wire, a circular pattern is pre-dotted at the junction of the copper wire and the grid line The cured conductive paste or conductive tape is pasted, copper wire is laid, and hot-pressed and cured below 200°C; then the copper wire and the cell are hot-pressed to complete the packaging of the double-sided busbar-free HIT cell. The invention greatly reduces the amount of silver paste used, reduces production costs, and solves the problem of poor weldability of batteries.

Description

technical field [0001] The invention relates to a method for encapsulating double-sided crystalline silicon heterojunction busbar-free solar cells, belonging to the field of manufacturing high-efficiency double-sided SHJ cells. Background technique [0002] The crystalline silicon heterojunction solar cell (Silicon Heterojunction Solar Cell, referred to as SHJ) combines the stability of crystalline silicon and the advantages of the wide band gap of amorphous silicon materials, which greatly improves the open circuit voltage of the cell and improves the conversion efficiency of crystalline silicon cells. SHJ batteries have the characteristics that ordinary crystalline silicon and amorphous batteries do not have. First, the temperature stability of the battery is good. Compared with the temperature coefficient of ordinary monocrystalline silicon batteries -0.5% / ℃, the temperature coefficient of SHJ SHJ batteries can reach - 0.25% / °C, so that the battery still has a good output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/048H01L31/18H01L31/0224
CPCY02E10/50H01L31/048H01L31/022433
Inventor 周盈盈熊胜虎袁晓柳翠叶晓军刘建中
Owner EAST CHINA UNIV OF SCI & TECH
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