Lithium battery electric core explosion prevention and power-off protection device and producing method

A lithium battery electric core explosion prevention and power-off protection device and a producing method. The device comprises an electric core casing, a metal top cover, a metal rupture disc, a metal vent hole plate, an annular insulation spacer, an annular sealed ring and an electric core tab. The explosion-proof construction are arranged on the rupture disc and the vent hole plate and comprises a V-shaped ring groove on the vent hole plate and a ring groove on the rupture disc. The rupture disc and the vent hole are connected through multi-point connection mode. The method comprises: stamping molding of top cover, rupture disc, vent hole plate and insulation spacer, injection moulding of sealing ring at high temperature, edging of rupture disc and laser welding of rupture disc and vent hole plate and sealing connection of parts and with the electric core. When the inner pressure of the electric core is higher than the preset value, an upward pressure through the vent hole lifts the recess of the rupture