Battery cover plate and lithium ion battery using same

The utility model provides a battery cover plate and a lithium ion battery using the battery cover plate. The battery cover plate comprises a cover plate base body and pole column units fixedly arranged on the cover plate base body in a sealed mode. One end, facing the interior of the lithium ion battery, of the cover plate base body is defined as the lower end. The pole column units and the cover plate base body are assembled in a sealed mode through a lower sealing ring and an upper sealing ring, wherein the lower sealing ring is installed on the pole column units in a sleeving mode and resists electrolytic solution corrosion, and the upper sealing ring is installed on the pole column units in a sleeving mode and resists high and low temperature aging. The lower sealing ring is arranged between the lower end face of the cover plate base body and the pole column units. The upper sealing ring is arranged between the upper end face of the cover plate base body and the pole column units. Due to matching of the lower sealing ring for resisting the electrolytic solution corrosion and the upper sealing ring for resisting the high and low temperature aging, the interior of the battery can be sealed reliably, the effects of sealing the electrolytic solution corrosion and the high and low temperature aging are achieved, the design and use requirements for the single sealing ring is lowered, and the overall design cost is reduced.