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US 7,923,137 B2Granted
Nonaqueous cell with improved thermoplastic sealing member
AssigneeEveready Battery Company, Inc.
InventorsMark A. Schubert, Jack W. Marple
Life of this patent
Estimating the term…
Abstract
An electrochemical battery cell with an aperture in the container or cell cover has the aperture sealed by an improved thermoplastic sealing member, which forms at least a part of the cell's pressure relief vent and is made from a material comprising a thermoplastic resin and more than 10 weight percent of a thermal-stabilizing filler, to provide an effective seal and a reliable pressure relief vent over a broad temperature range.
Claims24
An electrochemical battery cell comprising:
- a housing comprising a metal container with at least one open end and at least a first metal cover disposed in the at least one open end of the container;
- a positive electrode;
- a negative electrode;
- a separator disposed between the positive and negative electrodes;
- an electrolyte;
- and
- a first thermoplastic seal member, comprising a thermoplastic resin and more than 10 weight percent of a thermal-stabilizing filler, the first thermoplastic seal member sealing an aperture in at least one of the container and the first cover and forming at least a part of a pressure relief vent for releasing pressure from the cell, wherein the thermal-stabilizing filler comprises a glass.
4 more elements
An electrochemical battery cell comprising:
- a housing comprising a metal container with at least one open end and at least a first metal cover disposed in the at least one open end of the container;
- a pressure relief vent;
- a positive electrode;
- a negative electrode comprising at least one member of the group consisting of lithium, a lithium alloy and a lithium intercalation compound;
- a separator disposed between the positive and negative electrodes;
- a nonaqueous electrolyte comprising an organic solvent;
- and
- a first thermoplastic seal member sealing an aperture in the first cover;
- wherein the thermoplastic seal member:
- is made from a material comprising at least one polymeric resin selected from the group consisting of ethylene-tetrafluoroethylene, polybutylene terephthlate, polyphenylene sulfide, polyphthalamide, ethylene-chlorotrifluoroethylene, chlorotrifluoroethylene, perfluoroalkoxyalkane, fluorinated perfluoroethylene polypropylene and polyetherether ketone, as well as more than 10 weight percent of a thermal-stabilizing filler;
- has a hollow cylindrical shape;
- and
- cooperates with the first metal cover and a plug disposed within the thermoplastic seal member to form a compression seal for the aperture and to release pressurized gas from within the cell when a cell internal pressure exceeds a predetermined level.
10 more elements
Dependencies are inferred from the claim text.