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Solderable conductive silver paste with low-temperature back of crystalline silicon solar cell and preparation method

A technology of solar cells and conductive silver paste, which is applied in the manufacture of cables/conductors, circuits, and electrical components. It can solve problems such as soldering resistance to electric soldering irons, short storage time of pastes, and poor bonding strength of the substrate to achieve strong bonding strength. , prolong the storage time, the effect of small volume resistance

Active Publication Date: 2012-07-18
SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Currently commonly used solar modules need to repair the conductive lines on the back and solder the lead wires, and the curing temperature of the silver paste should not be too high so as not to affect the performance parameters of the battery, so the more suitable curing temperature is 150-200 degrees. The slurry mainly has the following problems: poor solder resistance, not resistant to electric soldering iron welding, large volume resistance, poor bonding strength with the substrate and short storage time of the slurry

Method used

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  • Solderable conductive silver paste with low-temperature back of crystalline silicon solar cell and preparation method
  • Solderable conductive silver paste with low-temperature back of crystalline silicon solar cell and preparation method
  • Solderable conductive silver paste with low-temperature back of crystalline silicon solar cell and preparation method

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Embodiment 1

[0032] A method for preparing a low-temperature solderable conductive silver paste on the back side of a crystalline silicon solar cell, the method comprising the following steps:

[0033] (1) Prepare materials according to the following components: 60kg of metallic silver powder, 10kg of polymer resin, 1kg of curing agent, and 29kg of solvent. The particle size of the silver powder is 4μm, the tap density is 3.0g / ml, the polymer resin is a modified bisphenol A epoxy resin, the softening point is 130°C, the curing agent is a closed melamine curing agent, and the solvent is ethylene glycol Butyl ether acetate;

[0034] (2) Preparation of carrier: Weigh modified bisphenol A type epoxy resin and ethylene glycol butyl ether acetate, heat it to 80°C and keep the temperature constant until the resin dissolves at constant temperature until the viscosity is 30000-40000 centipoise, and then filtering the resin on a mesh cloth of 300-400 mesh to obtain a carrier;

[0035] (3) Preparat...

Embodiment 2

[0039] (1) Prepare materials, prepare materials according to the following components: 65kg of metallic silver powder, 8kg of polymer resin, 1kg of curing agent, and 26kg of solvent. The particle size of the silver powder is 7μm, the tap density is 3.2g / ml, the polymer resin is modified bisphenol F epoxy resin, the softening point is 140°C, the curing agent is a blocked anhydride curing agent, and the solvent is ethylene glycol Butyl ether acetate;

[0040] (2) Preparation of the carrier: Weigh the modified bisphenol F epoxy resin and ethylene glycol butyl ether acetate, heat it to 80°C and keep the temperature constant until the resin dissolves at a constant temperature until the viscosity is 20000-40000 centipoise, and then filtering the resin on a mesh cloth of 300-400 mesh to obtain a carrier;

[0041] (3) Preparation of silver paste: Weigh metal silver powder and closed anhydride curing agent, then fully mix it with the carrier in a mixer, and then use a high-speed dispe...

Embodiment 3

[0044] (1) Prepare materials, prepare materials according to the following components: 50kg of metallic silver powder, 15kg of polymer resin, 2kg of curing agent, and 20kg of solvent. The particle size of the silver powder is 7μm, the tap density is 4.0g / ml, the polymer resin is a modified bisphenol F epoxy resin, the softening point is 140°C, the curing agent is a closed imidazole curing agent, and the solvent is ethylene glycol Butyl ether acetate;

[0045] (2) Preparation of the carrier: Weigh the modified bisphenol F epoxy resin and ethylene glycol butyl ether acetate, heat it to 80°C and keep the temperature constant until the resin is dissolved at constant temperature until the viscosity is 20000 centipoise, and then the resin Filter and remove impurities on a 300-mesh mesh cloth to obtain a carrier;

[0046] (3) Preparation of silver paste: Weigh metal silver powder and closed imidazole curing agent, then fully mix it with the carrier in a mixer, and then use a high-sp...

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Abstract

The invention relates to a solderable conductive silver paste with low-temperature back of a crystalline silicon solar cell and a preparation method, wherein the conductive silver paste comprises the following components and contents: metal sliver powder of 50 to 70, polymer resin of 5 to 15, a curing agent of 0.5 to 2 and a solvent 20 to 40; the preparation method comprises the following steps of: preparing materials, preparing a carrier, preparing silver paste and producing silver paste material. Compared with the prior art, the solderable conductive silver paste with low-temperature back of a crystalline silicon solar cell and a preparation method provided by the invention have the advantages that the soldering resistance of low-temperature conductive silver paste can be improved, the volume resistance of the conductive silver paste material can be reduced, the bonding strength between the sliver layer and the silicon can be improved and the storage time of the conductive silver paste can be prolonged.

Description

technical field [0001] The invention relates to a conductive silver paste, in particular to a back low-temperature solderable conductive silver paste for a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] Solar energy is an inexhaustible renewable energy source for human beings. It is also a clean energy source and does not produce any environmental pollution. Among the effective utilization of solar energy; solar photovoltaic utilization is the fastest growing and most dynamic research field in recent years, and it is one of the most watched projects. Large-scale development and utilization of photovoltaic solar power generation, improving the photoelectric conversion efficiency of batteries and reducing production costs are the core. Due to the further deepening of people's theoretical understanding of solar batteries, the improvement of production processes, the infiltration of IC technology and new batteries in the past ten y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/18H01B1/02H01B13/00
Inventor 周文彬王启明王德龙闻卫荣朱玉明
Owner SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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