Patent ID: 8440335

Claim:
An explosion-proof device for use in power batteries, said device comprises: a battery cover defining an explosion-proof hole; a valve seat securely mounted in the explosion-proof hole and hermetically sealing the battery cover; and a rupture film positioned in the valve seat and hermetically sealing the explosion-proof hole, wherein: the rupture film is insulatively isolated from the valve seat; an upper protective film is arranged at an upper side of the rupture film, and a lower protective film is arranged at a lower side of the rupture film; the valve seat is formed with a lower supporting portion at a lower side thereof, the lower protective film is seated on the lower supporting portion and is securely resisted on the lower supporting portion via a lower pressing member; and the valve seat is formed with an upper supporting portion at an upper side thereof, the rupture film is positioned on the upper supporting portion and pressed against the upper supporting portion via a middle pressing member, the upper protective film is sandwiched between the middle pressing member and an upper pressing member.