Low-temperature conductive silver paste for main grid of photovoltaic HJT battery and preparation method of low-temperature conductive silver paste

The invention discloses low-temperature conductive silver paste for a main grid of a photovoltaic HJT battery and a preparation method of the low-temperature conductive silver paste, and belongs to the technical field of photovoltaic batteries. The silver paste is composed of the following components in percentage by weight: 15%-19% of micron-sized flaky silver powder, 66%-70% of submicron-sized spherical silver powder, 3%-7% of nano-sized spherical silver powder, 3%-5% of resin, 0.1%-0.2% of a toughening agent, 2%-4% of a solvent, 0.2%-0.56% of a coupling agent, 0.3%-0.5% of a dispersing agent, 1.2%-1.5% of a high-temperature-resistant curing agent, 0.05%-0.8% of a curing accelerator, 0.2%-0.3% of an ultraviolet absorbent, 0.1%-0.2% of a free radical trapping agent and 0.1%-0.2% of an antioxidant. The method has the advantages of low cost, simple process, low product failure risk and the like. 本发明公开了一种光伏HJT电池主栅用低温导电银浆及其制备方法，属于光伏电池技术领域，所述导电银浆按照质量百分比，由以下组分组成：微米级片状银粉15~19%、亚微米级球形银粉66~70%、纳米级球形银粉3~7%、树脂3~5%、增韧剂0