Method for testing contact resistivity of conductive adhesive and metal electrode

Abstract

The invention provides a method for testing the contact resistivity of a conductive adhesive and a metal electrode, and the method comprises the steps: preparing a sample which comprises at least two conductive parts disposed at an interval, and a conductive adhesive connecting the two conductive parts; testing to obtain the resistance R between the conductive pieces with different intervals d; establishing a coordinate system, marking the resistance test result of the sample on the coordinate system, and performing linear fitting to obtain a corresponding straight line; and obtaining the contact resistivity rho of the conductive adhesive and the metal electrode through the straight line meter. According to the testing method, the contact resistivity of the conductive adhesive and the metal electrode can be conveniently and quickly evaluated, the material performance can be more accurately and quickly evaluated, and product development and improvement of the conductive adhesive are facilitated.

Description

technical field [0001] The present application relates to the technical field of photovoltaic material testing, in particular to a method for testing the contact resistivity between conductive glue and metal electrodes. Background technique [0002] Crystalline silicon solar cells and corresponding photovoltaic modules still occupy an important position in the photovoltaic market at this stage. Traditional photovoltaic modules realize the electrical connection of adjacent cells through soldering strips, and the light shining on the gap between adjacent cells cannot be effectively used; in contrast, shingled modules use conductive adhesive to realize the electrical connection between adjacent cells. The series connection increases the cell capacity per unit area and improves module efficiency. [0003] The performance of the above-mentioned soldering strips and conductive adhesive will greatly affect the conversion efficiency of photovoltaic modules. As far as conductive adh...

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Problems solved by technology

[0003] The performance of the above-mentioned soldering strips and conductive adhesive will greatly affect the conversion efficiency of photovoltaic modules. As far as conductive adhesive is concerned, electrical loss is an important indicator of its material performance, which is mainly affected by resistance

Specifically, it includes volume resistance, contact resistance between conductive adhesive and metal electrode. The former can be directly measured by four-probe methods, and the operation is simple; but the above-mentioned contact resistance still lacks reliable and convenient methods for testing.

Moreover, the existing test methods are mostly based on battery sheets and corresponding metal electrodes, and the sample preparation is inconvenient, which also greatly affects the development process and promotion of conductive adhesive materials.

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