EXPLOSION-PROOF SHEET FOR SECONDARY BATTERY AND SECONDARY BATTERY

The present disclosure discloses an explosion-proof sheet of a secondary battery and a secondary battery. The explosion-proof sheet includes a main body portion, a fixing portion and a cracking portion. The main body portion is opposite to the explosion-proof hole; a strengthening region is formed on the main body portion; the fixing portion is disposed around the main body portion, and the fixing portion is used to be connected to a periphery of the explosion-proof hole; and the cracking portion is located between the fixing portion and the main body portion and is connected to the fixing portion and the main body portion.