Welding method of solar cell
By partially removing the organic solder resist film from the solar cell grid lines, the problem of increased contact resistance caused by the OSP film was solved, achieving a cost-effective and stable soldering result.
CN121586313APending Publication Date: 2026-02-27TONGWEI SOLAR (HEFEI) CO LTD
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Patent Information
- Application Number
- CN202511676213.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-02-27
AI Technical Summary
Technical Problem
In the existing technology, although the copper electroplating process reduces the cost when preparing battery electrodes, the use of OSP film increases the contact resistance, which leads to a decrease in the electrical performance and reliability of solar cells.
Method used
The organic solder resist film is removed by laser or by using flux, and is only removed from the areas where welding is required on the grid lines. The temperature of other parts of the cell is controlled to ≤200℃ to avoid affecting the performance of the cell.
Benefits of technology
This reduces production costs, avoids increased contact resistance, ensures the electrical performance and reliability of solar cells, and prevents poor soldering issues.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a welding method of a solar battery, which comprises the following steps of: providing a battery piece, and arranging a grid line on the side surface of the battery piece; forming an organic solderability preservative film on the side surface of the battery piece, and enabling the organic solderability preservative film to cover the outer surface of the grid line; completely removing the organic solderability preservative film covering the part, needing to be welded with the welding wire, of the grid line, so that the part, needing to be welded with the welding wire, of the grid line is exposed; wherein in the process of removing the organic solderability preservative film at the position, where the welding wire needs to be welded, on the grid line, the temperature of the position, except for the welding wire, on the battery piece is made to be smaller than or equal to 200 DEG C; and the exposed parts on the grid lines are welded and connected with the welding wires. On one hand, the organic solderability preservative film covers the outer surface of the grid line, an anti-oxidation effect can be achieved, and compared with a tin plating process, the production cost is low; and on the other hand, the temperature of the parts except for the welding wire on the battery piece is controlled to be less than or equal to 200 DEG C, and the temperature is relatively low, so that the influence on the performance of an amorphous silicon layer, a silicon substrate and the like of the battery piece can be avoided.
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