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What does cell pre-soldering mean in battery production?

The main process of lithium battery assembly, and then analysis and disassembly step by step. The lithium battery assembly process includes positive and negative electrode baking → negative electrode bag making → lamination → pre-welding → trimming → welding → glue → inspection → packaging → film → XRAY test → bake → liquid injection → let stand.

The purpose of pre-welding is to weld the scattered tabs on the stacked core package together to facilitate the next process.