Detection method for preventing printing mixing during SE battery production process

Abstract

The invention discloses a detection method for preventing printing mixing during the SE battery production process. The step of shooting detection is added between SE laser doping and back-surface laser groove formation and is used for whether a batter piece after SE laser doping is consistent with the specification of a battery piece before the back-surface laser groove formation. A shooting table is additionally arranged between SE laser doping and back-surface laser groove formation, placement and detection of different types of battery pieces are handled by a coordinate system which is built in advance, contrast by camera shooting and a coordinate system is more convenient to identify compared with naked-eye observation, so that whether the type of the battery piece right subjected toSE laser doping is consistent with the type of the battery piece before back-surface laser groove formation is or not is determined, the situation that a large amount of pieces are mixed during subsequent production is prevented, and loss is prevented.

Description

technical field [0001] The invention relates to the technical field of printing and slotting of SE batteries, in particular to a detection method for preventing printing mixed sheets in the production process of SE batteries. Background technique [0002] With the continuous development of crystalline silicon technology, the expansion of solar cell production scale and the continuous reduction of cell prices, reducing production costs and improving efficiency are the focus of cell technology development. For existing conventional PERC cells, the front side has a higher junction depth and phosphorus concentration, and the high recombination of the reflector will lead to lower open voltage and short-circuit current, and the selective emitter (SE) electrode is because it receives Low-concentration doping in the illuminated area and high doping under the metal grid line form a lateral high-low junction structure to increase the potential difference between the P-N junctions, red...

AI Technical Summary

Problems solved by technology

And because the laser doping step is relatively advanced in the production process after diffusion, the clarity after coating is not easy to observe. Therefore, for laser doped areas with different patterns, if employees do not carefully observe the product, it is easy to cause large production lines. Batch mixing, resulting in large losses

[0004] For existing SE+PERC products, when there are more than one type of cell products in the production process, because different types of cell products will have different laser patterns, resulting in different laser doping areas, and the laser doping area itself The recognizability is poor, and it is difficult to observe with the naked eye. As a result, before the subsequent laser grooving on the back, it is impossible to identify whether the cell model after SE laser doping is the same as the cell model applicable to the back laser grooving, for example: SE The cell after laser doping is a 4BB cell, and the cell is doped with three anti-break grid lines. At this time, the subsequent back laser slotting machine must be equipped with four laser slotting lines when laser slotting, so that Only then can a good laser slotting process be carried out correspondingly; and if there are three anti-break grid lines doped on the battery sheet, and the subsequent back laser slotting machine correspondingly has five or more laser slotting lines during laser slotting , so that the anti-break grid line and the laser slotting line cannot perform the corresponding slotting process, which will cause a large amount of mixed chips in subsequent production and cause losses. Therefore, it is necessary to identify the type of the SE laser-doped cell sheet, and Laser slotting for matching, and in actual production, if laser doping is not performed at the position of the anti-break grid line, it will cause poor EL of the product

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