Cover assembly of secondary battery and secondary battery

A cover assembly of a secondary battery, comprising:

• a cover plate comprising 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 in such a manner that gas inside a case of the secondary battery is directly exhausted to an exterior of the secondary battery via only 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,
• wherein an orthographic projection of the sealing part on the cover plate does not overlap with an orthographic projection of the gas vent on the cover plate;
• the gas exhaust valve comprises a metal sheet and a fixing part, and the metal sheet seals the gas vent;
• the sealing part is arranged between the metal sheet and the cover plate for sealing a gap between the metal sheet and the cover plate;
• the fixing part is connected to the metal sheet, and the metal sheet is fixed to the cover plate by the fixing part;
• and
• the fixing part is configured to deform in response to an increase in temperature in such a manner that the metal sheet gets out of the state of sealing the gas vent.