Patent ID: 8828598

Claim:
A sealed cell including: a cell case formed with a through hole; a power generating element accommodated in the cell case; an inner terminal placed in the cell case and connected to the power generating element; a pole terminal including a cylindrical portion and a bottom portion provided at one end of the cylindrical portion, the bottom portion being formed with a through hole, the pole terminal being placed on outside of the cell case so that the bottom portion faces the cell case and the through hole of the bottom portion is positioned over the through hole of the cell case; a deformed terminal including a base surface portion placed in the cell case, and a hollow protruding portion extending from inside of the cell case into internal space of the cylindrical portion through the through hole of the cell case and the through hole of the pole terminal, and extending radially more outward than the through holes in the internal space so that the base surface portion and the protruding portion fix the pole terminal to the cell case; an inversion plate attached to the base surface portion of the deformed terminal so that at least a part of the inversion plate contacts with the inner terminal in a normal state and, when internal pressure of the cell case rises beyond working pressure, at least the part of the inversion plate is deformed to invert away from the inner terminal to interrupt conduction between the inner terminal and the deformed terminal; and a shaft member having a top portion at least a part of which is placed in the protruding portion so that, after the inversion plate is inverted, the top portion is pressed from outside and moved within the protruding portion to press the inversion plate inward to allow re-conduction between the inner terminal and the deformed terminal, wherein the deformed terminal and the inversion plate are arranged to provide therebetween hermetically sealed space separately from the internal space of the cell case.