Chemistry: electrical current producing apparatus – product – and – Plural concentric or single coiled electrode
Reexamination Certificate
1998-12-04
2001-04-24
Kalafut, Stephen (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Plural concentric or single coiled electrode
C429S211000, C429S161000, C429S178000
Reexamination Certificate
active
06221524
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to electric storage batteries and more particularly to a termination strap for thin metal film battery cells.
A thin metal film battery cell includes plates made from very thin lead foil pasted with an active material on both surfaces. Plates with positive active material and plates with negative active material are separated by a separator strip and are spirally wound to form a roll. Unpasted edges of the positive plates extend in one direction while unpasted edges of the negative plates extend in an opposite direction from the roll. Terminations of lead or lead alloy are cast on or soldered to the ends of the spiral roll. U.S. Pat. No. 5,198,313 issued Mar. 30, 1993, for “Battery End Connector” describes one arrangement of cast-on end connectors for the two ends of a spiral roll.
The present invention provides a termination for a thin metal film roll in the form of a cap-like strap which uses less lead than the terminations of the prior art and which facilitates improved exposure of each of the spiral layers, or convolutions, to electrolyte. The strap also facilitates high voltage extrusion welding of the straps of adjacent cells.
SUMMARY OF THE INVENTION
In accordance with the invention, a cap-like strap is formed at an end of a spirally wound cell of alternating convoluted layers of positive and negative thin metal foil plates. The shapes of the straps are is charactrized by the fact that the strap engages a portion of the projecting ends of each layer of the spiral, while leaving another portion of the projecting ends of each layer exposed. The strap is further characterized by an upstanding, integrally formed tombstone portion for connection to adjacent cells or to a terminal. A strap having the foregoing characteristics is formed at each end of the spiral roll.
The strap can take a variety of configurations and is preferably cast in place on the end of the spiral roll.
The foregoing and other objects and advantages of the invention will appear in the detailed description which follows. In the description, reference is made to the accompanying drawings which illustrate preferred embodiments of the invention.
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PCT International Search Report in International Appln. No. PCT/US99/00986, dated May 10, 1999.
“Preparation for an Alkali Storage Battery,”Patent Abstracts of Japan, Publ. No. 57046468, Publ. Date Mar. 16, 1982.
“Manufacture of Battery Having Spiral Electrode Body,”Patent Abstract of Japan, Publ. No. 60049558, Publ. Date Mar. 18, 1985.
“Positive Current Collector for Battery,”Patent Abstracts of Japan, Publ. No. 60049560, Publ. Date Mar. 18, 1985.
Andrew Michael G.
Dougherty Thomas J.
Zagrodnik Jeffrey P.
Dove Tracy
Johnson Controls Technology Company
Kalafut Stephen
Quarles & Brady LLP
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