Battery cell, battery, and power consuming device

A battery cell, comprising:

• a first housing wall, provided with a mounting hole;
• an electrode post, comprising a pass-through portion passing through the mounting hole and a first extending portion that is connected to the pass-through portion and extends, relative to the pass-through portion, toward a direction away from a central axis of the mounting hole, wherein the first extending portion extends to an outer side of an outer surface or an inner side of an inner surface of the first housing wall;
• and
• an insulating sealing structure, fitted between the electrode post and the first housing wall, wherein the first extending portion comprises a first section portion and a second section portion that are sequentially arranged in the direction away from the central axis of the mounting hole, and the second section portion presses against the insulating sealing structure to a greater degree than the first section portion,
• a side surface of the first section portion close to the first housing wall is a first surface, a side surface of the second section portion close to the first housing wall is a second surface, the second surface protrudes, relative to the first surface, toward a direction close to the first housing wall, the first surface obliquely extends, in the direction from the central axis of the mounting hole to the first housing wall, with a downward inclination towards the first housing wall.