COVER ASSEMBLY OF SECONDARY BATTERY AND SECONDARY BATTERY

The present disclosure relates to the technical field of energy storage devices, and in particular, to a cover assembly of a secondary battery and a secondary battery. The cover assembly includes: a cover plate including a gas vent; a gas exhaust valve configured to seal the gas vent and deform in response to an increase in temperature to get out of a state of sealing the gas vent; and a sealing part arranged between the gas exhaust valve and the cover plate and surrounding the gas vent for sealing a gap between the gas exhaust valve and the cover plate. For the cover assembly of the secondary battery and the secondary battery provided by the present disclosure, the gas exhaust valve seals the gas vent, and the gas exhaust valve deforms in response to an increase in temperature to get out of a state of sealing the gas vent. When temperature inside the case of the secondary battery rises, gas inside the case can be exhausted via the gas vent, thereby reducing a risk of thermal runaway of the secondary battery, and also slowing down the thermal runaway of the secondary battery and thus providing passengers with sufficient escape time. With the sealing part, a sealing effect thereof is improved.