Low-temperature silver paste for laser transfer printing, preparation method of low-temperature silver paste and HJT battery

The invention discloses low-temperature silver paste for laser transfer printing, a preparation method of the low-temperature silver paste and an HJT battery. The low-temperature silver paste comprises the following components in percentage by weight: 80-97% of silver powder, 2-4% of thermosetting resin, 0.2-0.5% of hydroxyl-containing alcohol polymer, 0.2-0.8% of blocked isocyanate, 0.1-0.3% of a latent accelerator, 0.1-0.5% of a coupling agent, 0.1-0.3% of a dispersing agent and 1-4% of a solvent. According to the low-temperature silver paste, the hydroxyl-containing alcohol polymer is added into the low-temperature silver paste, the problems that in the laser transfer printing process, demolding is difficult, and the grid lines are broken and peeled are solved, the low-temperature silver paste can be applied to printing of the 16-18-micron grid lines, and the low-temperature silver paste has the advantages of being easy to demold, not prone to breakage, excellent in heat resistance and freezing resistance