General slurry for main and fine grids of HJT solar cell and preparation method thereof

The invention discloses general slurry for main grids and fine grids of HJT (High Junction Transistor) solar cells. The general paste for the main grid and the fine grid of the HJT solar cell is prepared from the following components: 10%-15% of micron-sized flake silver powder, 65%-70% of submicron-sized spherical silver powder, 5%-12% of nano-sized spherical silver powder, 1.5%-3% of thermosetting resin, 0.2%-0.5% of modified polyvinyl butyral resin, 0.2%-0.5% of blocked isocyanate, 0.1%-0.3% of a latent accelerator, 0.1%-0.5% of a coupling agent and 0.1%-0.3% of a dispersing agent. And 1-4% of a solvent. According to the invention, one-step printing of the main grid and the fine grid is realized, the contact resistance of the TCO layer and the slurry can be reduced, the welding tension is improved, and the printing effect is good. The invention also discloses a preparation method of the general slurry for the main grid and the fine grid of the HJT solar cell. 本发明公开了一种HJT太阳能电池主细栅通用浆料，按照质量百分比计，所述HJT太阳能电池主细栅通