US3791868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a battery cell having a coiled metallic foil cathode member
Assignee: Dow Chemical Co
•
Filing: 1972-05-12
•
Granted: 1974-02-12
•
Expires: 1992-05-12
Abstract
Abstract The invention is an improved process for making a battery cell having as an electrode a metallic sheet wound into a vertical coil of spaced apart layers. The use of a thin metallic foil as such an electrode is made feasible by: 1. DISPOSING A METALLIC SPACER STRIP BETWEEN THE FOIL LAYERS ADJACENT TO THEIR LOWER EDGES 2. RADIALLY COMPRESSING THE SPACER STRIP AND THE FOIL INTO CLOSE CONTACT, AND 3. FORMING AT LEAST ONE COMMON ELECTRICAL CONNECTION BETWEEN THE SPACER STRIP AND FOIL EDGES BY HELI-ARCING A WELD BEAD ON THE BOTTOM OF THE ASSEMBLY.
Inventors
- 👤 C Compton
- 👤 W Taplin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:42
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/78; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M4/72; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A method of making a coiled sheet electrode for a battery cell, comprising a. disposing a narrow metallic spacer strip along one longitudinal edge of and upon a surface of an elongate metallic foil, b. rolling up the strip and foil together to form a generally cylindrical coil having a generally planar end surface consisting of the adjacent edges of the strip and foil, c. radially compressing the foil and strip together in the coil and d. forming a weld bead on said end surface by heli-arc welding.
Claim 2
Independent Claim
88 words
A method of making a coiled sheet electrode for a battery cell, comprising a. disposing a narrow metallic spacer strip along one longitudinal edge of and upon a surface of an elongate metallic foil, b. rolling up the strip and foil together to form a generally cylindrical coil having a generally planar end surface consisting of the adjacent edges of the strip and foil, c. radially compressing the foil and strip together in the coil and d. forming a weld bead on said end surface by heli-arc welding.
Claim 3
Dependent Claim
112 words
The method of claim 1 in which a plurality of hollow fibers, each having a closed end and an open end and having a diameter not more than twice the thickness of the spacer strip, are so disposed on the foil surface that they will be generally parallel to the coil axis and between those portions of the foil wraps not in contact with the spacing strip, said fibers having their closed ends adjacent the inner edge of said strip, having their open ends projecting uniformly beyond a second longitudinal edge of the foil and being composed of a material suitable for use as an electrolyte-membrane in an alkali metal-sulfur battery cell.
Claim 4
Dependent Claim
54 words
The method of claim 2 in which the fibers are closely spaced, a curable paste or slurry is deposited on the projecting end portions of the fibers and a tube sheet is formed by curing the continuous body of paste or slurry which results when the fibers, foil and strip are rolled up together.
Claim 5
Dependent Claim
14 words
The method of claim 1 in which the coil is formed around a mandrel.
Claim 6
Dependent Claim
36 words
The method of claim 4 in which the mandrel has an electroconductive end which projects out of said end surface of the coil and said weld bead is joined in electroconductive contact with said mandrel end.
Claim 7
Dependent Claim
11 words
A coiled sheet electrode made by the method of claim 1.
Claim 8
Dependent Claim
12 words
An alkali metal-sulfur battery component made by the method of claim 2.
Claim 9
Dependent Claim
12 words
An improved alkali metal-sulfur battery cell comprising the component of claim 7.
Claim 10
Dependent Claim
15 words
An improved alkali metal-sulfur battery comprising a component made by the method of claim 5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |