Power battery upper cover mechanism

The utility model provides a power battery upper cover mechanism. The power battery upper cover mechanism comprises a box body, a battery cell assembly arranged on the box body, an upper cover assembly arranged on the upper surface of the box body and a water cooling plate arranged on the lower surface of the box body, and the upper cover assembly comprises a first plate body, a heat preservation part, a flow channel, a second plate body, a first insulation part and a second insulation part; the heat preservation part and the flow channel are arranged on the first plate body, the heat preservation part is used for isolating an upper cover assembly from heat exchange with the environment, the flow channel is located on the periphery of the heat preservation part and used for cooling a battery cell assembly through cooling water, and the first insulation part is clamped at the exposed position after welding between the first plate body and the second plate body. And the second insulating part is arranged on the