Battery top cover and battery

A battery, comprising a battery top cover, a core and a connection member, wherein one end of the connection member is connected to a tab of the core, and another end of the connection member is connected to a bottom of a first mounting groove of the battery top cover to enable a pole of the battery top cover to be electrically connected to the core through the connection member, the battery top cover comprises a cover plate, a pressing plate, an insulation assembly and the pole, the cover plate is provided with a mounting hole penetrating through two sides in a thickness direction of the cover plate, the pole is disposed in the mounting hole and is spaced from the cover plate, the pole comprises a pole body, the first mounting groove configured to mount the connection member is disposed on a middle portion of a first end of the pole body, a circumferential portion of the first end of the pole body is provided with a first flange, a free end of the first flange extends towards a direction facing away from an axis of the mounting hole, the pressing plate is sleeved on an end of the pole body facing away from the first flange, and the insulation assembly is arranged between the pressing plate and the cover plate and between the first flange and the cover plate to enable the cover plate and the insulation assembly to be clamped between the pressing plate and the first flange.