Solar cell grid line structure and photovoltaic module

A solar cell and grid wire technology, applied in the field of solar cells, can solve problems such as increased battery attenuation, component power reduction, and unreliable connections, and achieve the effects of slowing down the deterioration of contact performance, reducing attenuation, and reducing corrosion

Active Publication Date: 2020-11-27
JINKO SOLAR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the connection between the main grid line and the auxiliary grid line in the existing battery grid line structure is not reliable enough, which increases the attenuation of the battery in the process of heat and humidity, and reduces the power of the module

Method used

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  • Solar cell grid line structure and photovoltaic module
  • Solar cell grid line structure and photovoltaic module
  • Solar cell grid line structure and photovoltaic module

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0082] The embodiment of the present invention has no special limitation on the preparation method of the above-mentioned first glass frit, and any method known to those skilled in the art may be used. For example, the raw materials can be mixed evenly, and then the mixed materials can be completely melted into molten glass in a high-temperature furnace, and then the molten glass is poured into a rolling mechanism to form glass flakes, and then the glass flakes are crushed into glass powder.

[0083] In some embodiments, the median diameter of the first glass frit can be nanoscale, for example, it can be 20-500 nanometers, it can be 50-500 nanometers, it can be 50-300 nanometers, it can be 100-200 nanometers, It can be 150-400 nanometers, etc.

[0084] The first paste for auxiliary grid lines may be a fire-through silver-aluminum paste, which may include silver powder, an organic vehicle or an organic component, etc. in addition to the above-mentioned first glass frit and alum...

Embodiment 1

[0133] A solar cell grid structure, including main grid lines and auxiliary grid lines;

[0134] Wherein, the first paste for the auxiliary grid line includes the above components in mass content: 75%-88% of silver powder, 1%-4% of aluminum oxide or aluminum-silicon alloy powder, 1%-5% of the first glass frit and 8%-13% of the first organic carrier; the first glass frit includes the following components by mass content: 55% of bismuth oxide, 0% of lead oxide, 15% of boron oxide, 4% of zinc oxide, 6% of silicon powder and others substance;

[0135] The second paste for the auxiliary grid line includes the following components in mass content: 88%-92% of silver powder, 2%-4% of the second glass frit and 8%-10% of the second organic vehicle; the second glass frit includes Components with the following mass content: tellurium oxide 50%, boron oxide 20%, zinc oxide 0.5% and other substances.

[0136] Wherein, the auxiliary grid line is partially arranged above the main grid line,...

Embodiment 2

[0139] The difference between embodiment 2 and embodiment 1 is only that the height of the busbars is 14-16 μm.

[0140] All the other are identical with embodiment 1.

[0141] A DH600h efficiency decay test was performed on an N-type solar cell including the grid wire structure of the solar cell in Example 2. The test results show that the DH600h battery efficiency decays by 2.5%.

[0142] From the comparative analysis of Example 2 and Example 1, it can be seen that increasing the height of the busbar helps to slow down the fading efficiency of the battery, and the height of the busbar is preferably 14-16 μm. However, if the height of the busbar is further increased to make the height of the busbar more than 16 μm, the effect of slowing down the degradation of the battery efficiency is not obvious.

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Abstract

The invention provides a solar cell grid line structure and a photovoltaic module, and relates to the technical field of solar cells. The solar cell grid line structure comprises a main grid line andan auxiliary grid line, wherein the first slurry for the auxiliary grid line comprises a first glass material and aluminum or an aluminum-containing material, the first glass material comprises a first metal oxide, the standard electrode potential of metal in the first metal oxide is greater than or equal to 0.3 V, and the mass content of the first metal oxide in the first glass material is greater than or equal to 35%; the auxiliary grid lines are partially arranged above the main grid lines, and the height of the main grid lines is larger than or equal to 12 micrometers. According to a solarcell grid line structure disclosed in the invention, the connection between the main grid lines and the auxiliary grid lines can be increased, the corrosion of electrochemical reaction to the grid lines is reduced, and the influence of series resistance increase and current collection capability reduction is better inhibited.

Description

technical field [0001] The present application relates to the technical field of solar cells, in particular to a solar cell grid structure and a photovoltaic module. Background technique [0002] With the continuous development of photovoltaic technology, the warranty period of photovoltaic modules is also continuously extended, and the reliability and durability of modules have attracted more and more attention from relevant research companies or institutions and consumers. Photovoltaic modules are generally used in outdoor environments. If they are in outdoor environments for a long time, especially under high temperature and high humidity conditions, water vapor in the environment will slowly age into the modules and cause corrosion of internal metal parts; the metal surface will undergo electrochemical reactions in contact with the electrolyte solution, making metal ions oxidization, or the generation of oxides and hydroxides, leading to material deterioration and change...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/068H01L31/042
CPCH01L31/022441H01L31/0682H01L31/042Y02E10/547Y02E10/50
Inventor 于琨刘长明张昕宇高贝贝闫循磊
Owner JINKO SOLAR CO LTD
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