▎ 摘　　要

NOVELTY - Brazing solder comprises 40-90 wt.% alloy powder, 0.1-3 wt.% graphene, 3-42 wt.% thermosetting resin, 1-2.5 wt.% organic acid, 0.3-10 wt.% curing agent, 0.8-10 wt.% auxiliary agent, where the alloy powder is composed of tin, bismuth, indium, zinc, and phosphorus. The thermosetting resin is bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin, acrylic resin and/or silicone resin. The organic acid is succinic acid, glutaric acid, adipic acid, phenylsuccinic acid, and methylsuccinic acid. The curing agent is dicyandiamide, imidazole, anhydride and/or modified amine. The auxiliary agent includes 2-5 wt.% corrosion inhibitor, 0.1-0.5 wt.% foam agent, 0.2-3 wt.% dispersant and 0-3 wt.% coupling agent. USE - Brazing solder is used for photovoltaic cell sheet used in solar power generation system. ADVANTAGE - The photovoltaic brazing solder has better conductivity, oxidation resistance and welding reliability, and reduces the risk of cracking and crushing in the assembly connection process, and has good application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method of brazing solder.