Cell circuit interrupter

Claim 1

A galvanic cell comprising a conductive container open at one end and closed at the opposite end and including in said container a positive electrode, a negative electrode and an electrolyte, and said container being in electrical contact with one of said electrodes; a cover mounted over said conductive container, said cover being secured to and electrically insulated from said conductive container and in electrical contact with the other electrode; an insulating member comprising a flat disc having an upwardly extending peripheral flange with the circumference of said insulating member being smaller than the circumference of the closed end of said conductive container, said insulating member disposed at the central exposed area of the closed end of the container with the peripheral flange extending outward and with the peripheral area of the closed end of the container being exposed; a terminal conductive member disposed within the flange and seated on the outer surface of said insulating member; an annular conductive member disposed and secured to the exposed peripheral area of the closed end of the container and extending over the upstanding flange of the insulating member and electrically contacting the terminal conductive member thereby adapting the terminal conductive member as the terminal for the electrode in electrical contact with said conducting container; and wherein the central area of the closed end of the conductive container upon bulging a predetermined amount will force the insulating member away from the closed end of the container whereupon the outward extending flange will push against the annular conductive member and thereby electrically isolate the terminal conductive member from the electrode in electrical contact with the conductive container.