TOPCon battery main grid silver paste and preparation method thereof

A silver paste and battery technology, which is applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve problems such as difficult welding, and achieve uniform collection, good compactness and good stability.

Pending Publication Date: 2022-04-05
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention proposes a busbar silver paste applied to TOPCon batteries and its preparation method, which solves the technical problem of using DUP technology to overcome the difficulty of welding the silver-aluminum paste for TOPCon in a single printing and Pb-Sn ribbon when the components are serially welded

Method used

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  • TOPCon battery main grid silver paste and preparation method thereof
  • TOPCon battery main grid silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of TOPCon battery main grid electrode silver paste, its mass percentage is composed as follows: 83.5% mixed silver powder, 1.5% main glass powder, 0.4% auxiliary glass powder, 12.4% organic vehicle, 1.5% thixotropic agent, 0.4% dispersant, 0.1% emulsifier, 0.1% defoamer, 0.1% leveling agent.

[0041] The preparation method is as follows:

[0042] (1) Preparation of mixed silver powder, take by weight 92% spherical silver powder A, 5% quasi-spherical silver powder B, 3% nano silver powder C and mix by mass percentage; the median diameter of the spherical silver powder A is 1.25 μm , the tap density is 5.6g / cm 3 ; The median particle size of the spherical silver powder B is 1.78 μm, and the tap density is 5.8 g / cm 3 ; The median diameter of the nano-silver powder C is 0.8 μm, and the tap density is 4.6g / cm3; the density of the mixed silver powder after sintering is 7.8g / cm 3 ;

[0043] (2) The main glass powder is calculated according to the mole percentage and...

Embodiment 2

[0047] The mass percent composition of the busbar silver paste in this embodiment is as follows: 82% mixed silver powder, 1.5% main glass powder, 0.4% auxiliary glass powder, 14% organic vehicle, 1.4% thixotropic agent, 0.4% dispersant Agent, 0.1% emulsifier, 0.1% defoamer, 0.1% leveling agent.

[0048] The preparation method is as follows:

[0049] (1) the preparation of mixed silver powder, take by mass percentage 8% spherical silver powder A, 90% quasi-spherical silver powder B, 2% nanometer silver powder C and mix; The median diameter of described spherical silver powder A is 1.1 μ m, the tap density is 5.8g / cm 3 ; The median particle size of the spherical silver powder B is 1.5 μm, and the tap density is 6.1 g / cm 3 ; The median diameter of the nano-silver powder C is 0.75 μm, and the tap density is 4.8 g / cm 3 ;The density of mixed silver powder after sintering is 8.0g / cm 3 ;

[0050] (2) The composition and preparation of main glass powder and auxiliary glass powder ...

Embodiment 3

[0054] The mass percent composition of the busbar silver paste in this embodiment is as follows: 83.5% mixed silver powder, 1.8% main glass powder, 0.5% auxiliary glass powder, 11.8% organic vehicle, 1.7% thixotropic agent, 0.4% dispersant Agent, 0.1% emulsifier, 0.1% defoamer, 0.1% leveling agent.

[0055] The preparation method is as follows:

[0056] (1) the preparation of mixing silver powder is identical with embodiment 1;

[0057] (2) The main glass powder is calculated according to the mole percentage and the components are as follows: PbO 28mol%, SiO 2 36mol%, TiO 2 20mol%, ZnO 7mol%, TeO 2 5mol%, Bi 2 o 3 4mol%; Auxiliary glass powder is calculated according to mole percent and is as follows: Bi 2 o 3 19mol%, SiO 2 52mol%, CuO 14mol%, MnO 2 6mol%, TeO 2 4mol%, ZnO 3mol%, MoO 3 2mol%; each component of the main glass powder and the auxiliary glass powder is mixed uniformly in the mixer, and then heated in a high-temperature furnace to 1600 ° C, kept ...

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Abstract

The invention relates to a main grid silver paste for a TOPCon battery. The main grid silver paste comprises 78 to 85 wt% of mixed silver powder, 1 to 5 wt% of main glass powder Pb-Si-Ti-Zn oxide, 0.1 to 2 wt% of auxiliary glass powder Bi-Si-Mn-Cu oxide, 8 to 20 wt% of an organic carrier and 0.5 to 5 wt% of an organic auxiliary agent, the mixed silver powder is a mixture of spherical silver powder A, sphere-like silver powder B and nano silver powder C; the fineness of the main grid silver paste is smaller than 8 microns, and the viscosity of the main grid silver paste at the rotating speed of 5 rmp is 90-150 Pa.S/25 DEG C. The main grid silver paste has a wide sintering window and high photoelectric conversion efficiency, and can be used for main grid electrodes on the front and back surfaces of a TOPCon battery at the same time.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon solar cells, in particular to a busbar silver paste applied to TOPCon cells and a preparation method thereof. Background technique [0002] According to the installed capacity data of new energy in 2020, as of the end of 2020, the total installed capacity of electric power in the country is about 2.2 billion kilowatts, and the cumulative installed capacity of wind and solar exceeds 530 million kilowatts, accounting for as high as 24%. The 2030 carbon peak goal is that the total installed capacity of light and wind should reach 1.2 billion kilowatts, that is, double within 10 years. The installed capacity of 530 million kilowatts of wind and solar power generation was completed in about 15 years. Although the current production capacity, technology, and industrial chain are more mature and complete, there are still difficulties in realizing it. [0003] It is particularly important to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
Inventor 许吉林谢继峰卢波苏正鹏程晨琛陈卫龙李大爱
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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