Series welding process of lithium battery

The invention discloses a series welding process of a lithium battery. The series welding process is characterized by comprising the following steps that, S1, a lithium battery is discharged; S2, a nickel strip is fed; S3, a driving cylinder extends out at the first stage, a first carrier and a second carrier are close to each other, and two lithium batteries with opposite polarities fall into a welding hole and are limited between a first welding plate and a second welding plate; S4, the driving cylinder continues to extend at the second stage, and when the first carrier and the second carrier are close to each other, the two ends of the lithium battery in the step S3 are welded synchronously through one set of welding pins on the first carrier and one set of welding pins on the second carrier; and S5, the driving cylinder resets at the third stage, a first supporting plate and a second supporting plate at the bottom of the welding hole are opened, and the welded lithium battery fallsinto the next working pr