This invention discloses a high-precision sealing device for
lithium batteries, relating to the field of
lithium battery production technology. By incorporating a spiral injection
assembly, the
electrolyte, after being transported through the inner injection tube, diffuses towards the spiral blades under the guidance of the arc surface and is released into the
cell through spirally distributed outlet holes. This creates a spiral
diffusion flow of
electrolyte, which, compared to the traditional single-point direct injection method, reduces the local
impact of the
electrolyte on the
electrode, improves the uniformity of electrolyte distribution between the
electrode layer and the separator layer, and reduces local dry areas and bubble accumulation, thereby improving the quality and
wetting efficiency of the
cell injection. Furthermore, the vacuum channel, suction groove, and negative pressure degassing
assembly can perform local negative pressure degassing treatment inside the
cell after injection, allowing tiny bubbles adhering to the
electrode surface and separator pores to be discharged promptly, reducing liquid surface fluctuations and secondary bubble generation, thus improving electrolyte
wetting sufficiency and cell consistency.