CAP ASSEMBLY AND SECONDARY BATTERY

The disclosure relates to a cap assembly and a secondary battery. The cap assembly comprises: a cap plate comprising an electrode lead-out hole; an electrode terminal disposed at a side of the cap plate and covering the electrode lead-out hole; a fixing component, wherein the fixing component and the electrode terminal are disposed at the same side of the cap plate, the electrode terminal is connected to the cap plate through the fixing component, and the fixing component comprises a protrusion extending between the electrode terminal and the cap plate; and a sealing ring, wherein the cap plate is connected to the electrode terminal through the sealing ring, and in an axial direction of the electrode lead-out hole, a projection of the sealing ring at least partially overlaps with a projection of the protrusion.