Lithium ion battery and liquid injection hole plugging structure thereof

The utility model discloses a lithium ion battery and a liquid injection hole plugging structure thereof. The lithium ion battery comprises a battery shell with an opening part, an inner core accommodated in the battery shell, and a battery cover cap sealed and fixed at the opening part of the battery shell, a liquid injection hole for injecting electrolyte into the battery shell is formed in thebattery shell or the battery cap; the liquid injection hole is a through hole extending in a curve mode, and a plastic ball and a steel ball which block the liquid injection hole are plugged in the liquid injection hole. The plugging structure for the liquid injection hole of the lithium ion battery is easy to implement and stable in structure, and can ensure that internal gas is smoothly exhausted after the battery is formed in the plugging process. 本申请公开了一种锂离子电池及其注液孔封堵结构，所述锂离子电池包括：带有开口部的电池壳，收容于所述电池壳中的内芯，封闭固定于所述电池壳开口部的电池盖帽；所述电池壳或所述电池盖帽上开设有用于向所述电池壳内部灌注电解液的注液孔；所述注液孔为曲线延伸的通孔，并且所述注液孔内塞有将该注液孔封堵住的塑料球和钢球。本申请这种锂离子电池注液孔封堵结构容易