The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2005
Filed:
Oct. 19, 2001
William H. Bushong, Madison, WI (US);
Cheeseman Paul, Verona, WI (US);
Thomas Kaufman, Middleton, WI (US);
Michael Root, Verona, WI (US);
Aaron Rositch, Edgerton, WI (US);
Marc L. Syvertsen, Madison, WI (US);
Viet H. VU, Verona, WI (US);
William H. Bushong, Madison, WI (US);
Cheeseman Paul, Verona, WI (US);
Thomas Kaufman, Middleton, WI (US);
Michael Root, Verona, WI (US);
Aaron Rositch, Edgerton, WI (US);
Marc L. Syvertsen, Madison, WI (US);
Viet H. Vu, Verona, WI (US);
Rayovac Corporation, Madison, WI (US);
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. Alternatively, a rechargeable cell may include a strain gauge disposed in its outer surface whose resistance changes as the outer surface of the battery expands due to internal pressure accumulation during charging. 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.