Battery with weldable feedthrough
AssigneeMedtronic, Inc.
InventorsWilliam J. Taylor, Douglas J. Weiss, Joseph Lessar, Jennifer P. Miller, Robert E. Kraska
Life of this patent
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Abstract
A lithium battery having a weldable feedthrough which is compatible with liquid electrolytes containing organic solvents and lithium salts under long term use conditions. The feedthrough comprises a pin of niobium or tantalum and ductile alloys thereof and a low silica insulating glass positioned around a portion of the pin in sealing engagement with the pin. The feedthrough is assembled into an aperture of the battery case where it provides an electrically conductive pathway from the anode or cathode to the exterior of the case and provides a hermetic seal.
Claims18
A battery with a weldable feedthrough, the battery comprising:
- (a) a case defining a feedthrough aperture;
- (b) a lithium anode;
- (c) a cathode;
- (d) an electrolyte comprising a lithium salt in an organic solvent within the case;
- and
- (e) a feedthrough secured in the aperture comprising:
- 1. a pin of a metal selected from the group consisting of niobium and ductile alloys thereof;
- and
- 2. an insulating glass positioned around a portion of the pin in sealing engagement with the pin, said insulating glass having a silica content of 0-50%.
A battery with a weldable feedthrough, the battery comprising:
- (a) a case defining a feedthrough aperture;
- (b) a lithium anode;
- (c) a cathode comprised of a material selected from the group consisting of manganese dioxide and silver vanadium oxide;
- (d) an electrolyte comprising a lithium salt in an organic solvent within the case;
- and
- (e) a feedthrough hermetically secured in the aperture comprising:
- (1) a pin in contact with the anode, the pin comprised of a metal selected from the group consisting of niobium, tantalum and ductile alloys thereof;
- and
- (2) an insulating glass positioned around a portion of the pin in sealing engagement with the pin, the insulating glass having a nominal composition of SiO.sub.2 =45 wt %, B.sub.2 O.sub.3 =8 wt %, Al.sub.2 O.sub.3 =20 wt %, MgO=7 wt %, CaO=12 wt %, SrO=6 wt %, and La.sub.2 O.sub.3 =2 wt %.
A battery with a weldable feedthrough, the battery comprising:
- (a) a case defining a feedthrough aperture;
- (b) a lithium anode;
- (c) a cathode comprised of a material selected from the group consisting of manganese dioxide and silver vanadium oxide;
- (d) an electrolyte comprising a lithium salt in an organic solvent within the case;
- and
- (e) a feedthrough hermetically secured in the aperture comprising:
- (1) a pin in contact with the anode, the pin comprised of a metal selected from the group consisting of niodium, tantalum and ductile alloys thereof;
- and
- (2) an insulating glass positioned around a portion of the pin in sealing engagement with the pin, the insulating glass having a nominal composition of B.sub.2 O.sub.3 =40 wt %, Al.sub.2 O.sub.3 =20 wt %, MgO=20 wt %, and CaO=20 wt %.
Dependencies are inferred from the claim text.