SECONDARY BATTERY, BATTERY MODULE AND DEVICE

This application relates to a secondary battery a battery column, and an apparatus. The secondary battery includes a top cover plate having an outer surface and an inner surface disposed opposite each other in a thickness direction of the top cover plate and an electrode lead-out hole extending along the thickness direction; a pole disposed in the electrode lead-out hole where the pole includes a first metal layer and a second metal layer and the first metal layer and the second metal layer are stacked along a direction from the inner surface to the outer surface an insulation member disposed between the top cover plate and the pole and a first bonding layer disposed between the insulation member and the first metal layer where the first metal layer and the first bonding layer are bonded by a chemical bond, the insulation member and the first bonding layer are bonded by a chemical bond, and the insulation member is hermetically connected to the first metal layer through the first bonding layer In the secondary battery the first bonding layer improves connection strength and sealing reliability of the insulation member and the pole and reduces the possibility of sealing failure or sealing performance deterioration of the insulation member caused when the insulation member shifts or falls off.