The level of photovoltaic solar cells is divided into three levels: ABC. A is the highest level, and if any single battery cell fails, it becomes a B-level battery cell, while C-level battery cells are directly eliminated. Distinguishing battery cells is to effectively subdivide them according to power and current, so that the parameters of the same component's battery cells are basically consistent, thereby ensuring the optimal implementation of the component's power. From the perspective of color difference: the etching degree allows for slight etching marks that are similar in color to the battery cell, and cannot be inside the border. At most, only two colors are allowed. For example: light blue - blue, blue - deep blue. But not including yellow - gold. The color of the same battery cell must be uniform, and the color of the same pack of battery cells must be consistent, and color jumping is not allowed; The positive surface and surroundings of the battery are not allowed to turn red or yellow. The width of the etching mark is ≤ 0.5mm.

　　From the perspective of color spots and dirt: it is allowed to have indistinct color spots on the edges (observed at a distance of 30 cm under normal light intensity). The total area of color spots shall not exceed 3% of the total battery area, and the number of spots shall not exceed (2). It is allowed to have three or fewer dirt particles with a diameter less than 1.5mm.

　　From the perspective of edge collapse: slight edge collapse is allowed at the edge of the illuminated surface, with a depth not exceeding 0.5mm, a length not exceeding 1.5mm, and a number not exceeding 1, without V-shaped missing corners. Not at the extension edge of the main grid line; Back edge collapse area ≤ 1.0 * 1.0mm, quantity ≤ 3; It is not allowed to have edge collapse on both sides at the same position.

　　From the perspective of aluminum beads and aluminum bubbles, there is no phenomenon where aluminum beads can have slight aluminum bubbles. The height of the aluminum bubble is ≤ 100um, and there is no obvious protrusion on the hand film. In cases where the distribution is not concentrated, it is allowed to have less than 5. If it is concentrated, the number of concentrated distributions should be ≤ 3. Single area ≤ 2mm ²

　　From the scratch situation, it can be seen that positive electrode scratches are allowed, with a scratch length of ≤ 25px, a width of ≤ 5px, and a quantity of ≤ 1; If the color of the scratch is similar to the color of the battery body, it is acceptable. Backfield scratches ≤ 125px, width ≤ 0.5mm, and quantity ≤ 2 are allowed. From the perspective of size: 125S: Side length: 125 × 125 (mm); Diameter: 150mm or 165mm (distinguished according to different feed types); Dimensional accuracy: ± 0.5mm; The thickness tolerance is ± 40um; 150S: Side length: 150 × 150 (mm); Diameter: 211mm; Dimensional accuracy: ± 0.5mm; The thickness tolerance is ± 40um; 156S: Side length: 156 × 156 (mm); Diameter: 219.21mm; Dimensional accuracy: ± 0.5mm; The thickness tolerance is ± 40um;