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US4209574A
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Long-life alkaline primary cell having low water content
Assignee: Leclanche SA
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Filing: 1979-07-06
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Granted: 1980-06-24
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Expires: 1999-07-06
Abstract
Abstract A flat, long-life alkaline primary cell having a low water content comprises a positive electrode of mercuric oxide or silver oxide, a negative electrode of amalgamated zinc or cadmium, and separator layers disposed between the electrodes. The positive electrode lies upon a disc of nickel screening. Flanged edges of two of the separator layers are gripped between a cover and a sealing ring. The electrolyte absorbed by the separator layers is a mixture of sodium hydroxide, potassium hydroxide, and rubidium hydroxide. The number of moles of water per mole of alkali hydroxide is 2.0-2.7 for sodium hydroxide, 2.4-3.1 for potassium hydroxide, and 2.8-4.0 for rubidium hydroxide.
Inventors
- 👤 Paul Ruetschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12; H01M6/08; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A long-life alkaline primary battery cell having a low water content, comprising a positive electrode of silver oxide or mercuric oxide, a negative electrode, and an alkali hydroxide electrolyte, wherein the water content of said cell as a whole does not exceed an amount represented by the formula w=(n.sub.NaOH ·f.sub.NaOH)+(n.sub.KOH ·f.sub.KOH)+(n.sub.RbOH ·f.sub.RbOH) wherein W=moles of water per cell n NaOH =moles NaOH per cell n KOH =moles KOH per cell n RbOH =moles RbOH per cell f NaOH =2.0 to 2.7 f KOH =2.4 to 3.1 f RbOH =2.8 to 4.0.
Claim 2
Dependent Claim
91 words
A long-life alkaline primary battery cell having a low water content, comprising a positive electrode of silver oxide or mercuric oxide, a negative electrode, and an alkali hydroxide electrolyte, wherein the water content of said cell as a whole does not exceed an amount represented by the formula w=(n.sub.NaOH ·f.sub.NaOH)+(n.sub.KOH ·f.sub.KOH)+(n.sub.RbOH ·f.sub.RbOH) wherein W=moles of water per cell n NaOH =moles NaOH per cell n KOH =moles KOH per cell n RbOH =moles RbOH per cell f NaOH =2.0 to 2.7 f KOH =2.4 to 3.1 f RbOH =2.8 to 4.0.
Claim 3
Dependent Claim
58 words
A primary cell in accordance with claim 1 taking the form of an ultraflat button-type cell, further comprising a cup, a cover, a sealing ring, and a dish-shaped separator having a flanged edge, said separator being disposed between said positive electrode and said negative electrode, and said flanged edge being gripped between said cover and said sealing ring.
Claim 4
Dependent Claim
61 words
A primary cell in accordance with claim 1 taking the form of an ultraflat button-type cell, further comprising a cup having a bottom, a cover, a sealing ring, and a dish-shaped separator having a flanged edge, said separator being disposed between said positive electrode and said negative electrode, and said flanged edge being gripped between said sealing ring and said bottom.
Claim 5
Dependent Claim
49 words
A primary cell in accordance with claim 2 or claim 3, wherein said positive electrode takes the form of a pellet substantially accommodated within a space bounded by said sealing ring and said cover but does not extend to the peripheral portion of said cup under said sealing ring.
Claim 6
Dependent Claim
58 words
A primary cell in accordance with claim 1 taking the form of an ultra-flat button-type cell, further comprising a cup forming the positive pole and having a bottom, a sealing ring, and an electrically conductive contact disc of nickel screening resting on said bottom, the edge of said disc being pressed against said bottom by said sealing ring.
Claim 7
Dependent Claim
22 words
A primary cell in accordance with claim 1, wherein said positive electrode and said negative electrode are separately wetted with different electrolytes.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |