Weld strip welding method capable of lowering cell fragment rate
A welding method and cell technology, applied in the field of solar cells, can solve the problems of large battery deformation, large interaction stress, and high battery fragmentation rate, and achieve the effect of reducing fragmentation rate and meeting welding requirements
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Embodiment 1
[0020] A ribbon welding method capable of reducing the fragmentation rate of battery sheets, comprising the following steps: selecting an ultra-soft ribbon 1, the yield strength of which is ≤50 MPa, and bending twice to form an ultra-soft ribbon with two bending angles 3 For softly bending the ribbon, the opening directions of the two bending angles 3 are opposite, and the angle of the bending angle is 90°, specifically as figure 2 As shown in , select cell 2 and preheat cell 2. During preheating, first heat at 60°C for 30 seconds, then raise the temperature to 70°C within 30 seconds, and continue to heat up to 85°C within 60 seconds. After preheating, the adjacent two battery sheets are connected in series with ultra-soft bending welding strip 1. The temperature during series welding is 150°C. The specific process of thermal insulation and slow cooling of the battery sheet and the ultra-soft bending ribbon is: maintain at 150°C for 30 seconds, cool down to 120°C within 45 se...
Embodiment 2
[0022] A ribbon welding method capable of reducing the fragmentation rate of battery sheets, comprising the following steps: selecting an ultra-soft ribbon 1, the yield strength of which is ≤50 MPa, and bending twice to form a ribbon with two bending angles 3 For ultra-soft bent ribbons, the opening directions of the two bent angles 3 are opposite, and the angle of the bent angle is 100°, specifically as figure 2 As shown in , select cell 2 and preheat cell 2. During preheating, first heat at 55°C for 35 seconds, then raise the temperature to 65°C within 20 seconds, and continue to heat up to 75°C within 50 seconds. After preheating, the adjacent two cells are connected in series with ultra-soft bending welding strip 1. The temperature during series welding is 160°C. The specific process of thermal insulation and slow cooling of the battery sheet and ultra-soft bending ribbon is: maintain at 160°C for 20 seconds, cool down to 110°C within 50 seconds, cool down to 90°C within ...
Embodiment 3
[0024] A ribbon welding method capable of reducing the fragmentation rate of battery sheets, comprising the following steps: selecting an ultra-soft ribbon 1, the yield strength of which is ≤50 MPa, and bending twice to form an ultra-soft ribbon with two bending angles 3 Softly bend the ribbon, the opening directions of the two bending angles 3 are opposite, and the angle of the bending angle is 110°, specifically as figure 2 As shown in , select cell 2 and preheat cell 2. During preheating, first heat at 65°C for 25 seconds, then raise the temperature to 75°C within 40 seconds, and continue to heat up to 95°C within 70 seconds. After preheating, the adjacent two cells are connected in series with ultra-soft bending welding strip 1. The temperature during series welding is 140°C. The specific process of thermal insulation and slow cooling of the battery sheet and ultra-soft bending ribbon is: maintain at 140°C for 40 seconds, cool down to 130°C within 30 seconds, cool down to...
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