Abstract: In an electrochemical cell a container houses a cathode, an anode, a separator between the cathode and the anode, a negative current collector and a sealing assembly for sealing a terminal end of the separator extending outward from between the cathode and the anode. The sealing assembly seals the terminal end of the separator between a first sealing member in sealing relationship with the first face of the separator terminal end and a second sealing member in sealing relationship with the second face of the separator terminal end. In another embodiment, the sealing assembly seals the terminal end of the separator between the sealing assembly in sealing relationship with the first face of the separator terminal end and at least one of the cathode, the anode and the container in sealing relationship with the second face of the separator terminal end.

Abstract: A rechargeable electrochemical cell is provided having a pressure-responsive apparatus for determining a charge termination point. In particular, a reversible pressure-responsive switch may be disposed in a cap at the open end of a rechargeable metal hydride cell. The reversible pressure-responsive switch may also contain a vent system for releasing the cell internal pressure. Additionally, a rechargeable cell is used combination with a charging source that can supply constant voltage, constant current, alternating current, or voltage that varies between a minimum threshold and a maximum threshold. Components of the switch are preferably made of a material that facilitates predictable switch activity.