Base metal conductive paste for photovoltaic cell, and preparation method, use method and application thereof

By coating and dispersing base metal powders with specific oxides, the problem of easy oxidation of base metals in high-temperature environments is solved, and the cost of conductive slurry is reduced and battery performance is improved. It is suitable for TOPCon and BC batteries.

CN120708965APending Publication Date: 2025-09-26JIANGSU RIYU PHOTOVOLTAIC NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202510978903.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-16
Publication Date
2025-09-26

AI Technical Summary

Technical Problem

In the existing technology, base metal conductive pastes are easily oxidized in high temperature environments, resulting in increased resistance, affecting the battery performance and cost of photovoltaic cells, and are difficult to effectively replace precious metal silver.

Method used

The base metal powder is coated with a specific type of oxide, and combined with compatible glass powder and antioxidant additives to form a continuous and dense barrier to prevent the base metal from oxidizing. The base metal conductive slurry is then prepared by grinding and dispersing it through a three-roller mill.

Benefits of technology

It effectively inhibits base metal oxidation during high-temperature sintering, significantly reducing the cost of conductive paste while maintaining battery performance comparable to pure silver conductive paste. It is suitable for TOPCon and BC batteries, improving battery conversion efficiency and reliability.

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Abstract

The invention provides base metal conductive paste for a photovoltaic cell and a preparation method, a use method and application thereof, and the conductive paste comprises the following components in percentage by mass: 5-60wt% of oxide coated base metal powder, 27-77wt% of silver powder, 2-5wt% of glass powder, 0.1-3wt% of an antioxidant aid and the balance of an organic carrier; wherein the base metal powder comprises one or more of copper, tungsten, tin, nickel, aluminum and alloy powder of the copper, the tungsten, the tin, the nickel, the aluminum and the alloy powder of the aluminum, and the oxide comprises one or more of silicon oxide, aluminum oxide, titanium oxide and boric oxide. The base metal powder coated with a specific type and a proper amount of oxide is selected and matched with the oxide and the glass powder which are good in compatibility, the manufacturing cost of the conductive paste and the battery can be effectively reduced, meanwhile, the conductive paste is applied to TOPCon and BC batteries, and the battery conversion efficiency can be kept equivalent to or even superior to that of traditional pure silver conductive paste.
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