Patent ID: 8679670

Claim:
A current interrupt device, comprising: a) a first conductive plate, composed at least in part of aluminum, including: i) a frustum having a first end, a second end, the first end having a broader diameter than the second end, ii) a base extending radially from a perimeter of the first end of the frustum, and iii) an essentially planar cap sealing the second end of the frustum and having a surface facing away from the base of the first conductive plate; and b) a second conductive plate having a surface that is essentially co-planar with the surface of the essentially planar cap, the second conductive plate being composed at least in part of aluminum, and having at least one spot weld, wherein the second conductive plate is in electrical communication at the at least one spot weld with the first conductive plate, and wherein the second conductive plate defines a depression, wherein the thickness of the second conductive plate at the depression is equal to or greater than one-half the thickness of the first conductive plate proximate to the spot weld, but less than the thickness of the first conductive plate proximate to the spot weld, the spot weld providing electrical contact of the second conductive plate with the essentially planar cap of the first conductive plate and penetrating only a portion of the thickness of the first conductive plate, and wherein the second conductive plate defines at least one through-hole, whereby equalization of pressure between opposite sides of the second conductive plate is maintained without interference by the first conductive plate, and whereby higher pressure on a first surface of the first conductive plate facing the second conductive plate relative to a second surface of the first conductive plate will cause separation of the first conductive plate from the second conductive plate to thereby disrupt electrical communication at the electrical contact.