Patent ID: 6926992

Claim:
A nonaqueous electrolyte secondary battery comprising: a case; an electrode group provided in the case and including a positive electrode, a negative electrodes, and a nonaqueous electrolyte; and a sealing unit arranged in an open portion of the case, the sealing unit including a conductive safety vent comprising a rupture portion that is ruptured by an increase in an internal pressure of the case, a positive electrode terminal electrically connected to the positive electrode, and a conductive support plate arranged between the conductive safety vent and the positive electrode terminal, wherein: the conductive support plate is formed of a composite matellic material, the composite metallic material being a clad material comprising a Cu-containing layer and Ni-containing layers formed on both surfaces of the Cu-containing layer; a ratio of a total thickness of the Ni-containing layers to a thickness of the Cu-containing layer is within a range between 0.1:1 and 1:1; and the conductive support plate has an area resistance value RS at 20° C. falling within a range from 0.032 μΩ·cm 2 to 1.24 μΩ·cm 2 .